US3784291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic shutter releasing device for a photographic camera
Assignee: Canon Inc
•
Filing: 1971-10-22
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Granted: 1974-01-08
•
Expires: 1991-10-22
Abstract
Abstract An electromagnetic shutter releasing device for a photographic camera utilizes, in combination with a permanent magnet, an electromagnet controlled by a pulse-like electric input to electromagnetically release a movable shutter blade from its normal stop position to a position for exposing a film. The polarity of the electric input to the electromagnet may be reversed so as to cause an interaction between the electromagnet and the permanent magnet and the resulting relative movement of the two magnets is detected to start and stop a shutter shaft drive motor. During a continuous shot, the drive motor may be maintained operative with the aid of the permanent magnet alone and without any electric input applied to the electromagnet.
Inventors
- 👤 N Hirata
- 👤 T Takigawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:26
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/18; G03B21/00; G03B21/14; G03B21/32; G03B21/50
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
408 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; release switch means movable between an OFF position and an ON position for operating the camera; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; a movable member operatively engageable with said switching means for actuating said driving means; actuating means for actuating said movable member to activate said switching means, said actuating means including permanent magnet means, a pair of coils wound around a soft magnetic material and electromagnet means, and said electromagnet means, when energized by said power supplying means, actuating said movable member by interaction between the electromagnetic field produced by said electromagnet means and the magnetic field by said permanent magnet means; blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; and power supply control circuit means including a first circuit which when the camera is continuously shooting, provides, in response to the turning of said release switch from OFF position to ON position, the electric current supply to the first coil of said electromagnet during a predetermined time from the turning operation, and a second circuit which provides, in response to the turning of said release switch from ON position to OFF position, the electric current supply to the second coil of said electromagnet during a prEdetermined time from the turning from ON position to OFF position, thereby disconnecting the power supply from said power supplying means to said actuating means during continuous shooting; said blocking means being moved, when continuously shooting, into said second rest position thereof by the movement of said movable member, and being maintained at said second rest position even after the electric power supply from said power supplying means is stopped by said control circuit means, thereby permitting the continuous operation of said shutter means.
Claim 2
Dependent Claim
408 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; release switch means movable between an OFF position and an ON position for operating the camera; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; a movable member operatively engageable with said switching means for actuating said driving means; actuating means for actuating said movable member to activate said switching means, said actuating means including permanent magnet means, a pair of coils wound around a soft magnetic material and electromagnet means, and said electromagnet means, when energized by said power supplying means, actuating said movable member by interaction between the electromagnetic field produced by said electromagnet means and the magnetic field by said permanent magnet means; blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; and power supply control circuit means including a first circuit which when the camera is continuously shooting, provides, in response to the turning of said release switch from OFF position to ON position, the electric current supply to the first coil of said electromagnet during a predetermined time from the turning operation, and a second circuit which provides, in response to the turning of said release switch from ON position to OFF position, the electric current supply to the second coil of said electromagnet during a prEdetermined time from the turning from ON position to OFF position, thereby disconnecting the power supply from said power supplying means to said actuating means during continuous shooting; said blocking means being moved, when continuously shooting, into said second rest position thereof by the movement of said movable member, and being maintained at said second rest position even after the electric power supply from said power supplying means is stopped by said control circuit means, thereby permitting the continuous operation of said shutter means.
Claim 3
Dependent Claim
31 words
A combination as defined in claim 1, wherein said movable member maintains said switch means in said connecting condition when said shutter means is not positioned at said predetermined position thereof.
Claim 4
Dependent Claim
237 words
In a photographic camera capable of continuous shooting, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; said shutter means including a rotatable shutter blade and a shutter shaft for rotatably supporting said blade thereon, driving means for rotatably driving said shutter means, power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means, electromagnetic means and control means for controlling the electric energy supply to the electromagnetic means; and blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; said blocking means being moved, when continuous shooting, into said second rest position thereof, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control means, thereby permitting the continuous operation of said shutter means.
Claim 5
Dependent Claim
237 words
In a photographic camera capable of continuous shooting, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; said shutter means including a rotatable shutter blade and a shutter shaft for rotatably supporting said blade thereon, driving means for rotatably driving said shutter means, power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means, electromagnetic means and control means for controlling the electric energy supply to the electromagnetic means; and blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; said blocking means being moved, when continuous shooting, into said second rest position thereof, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control means, thereby permitting the continuous operation of said shutter means.
Claim 6
Dependent Claim
241 words
In a photographic camera capable of continuous shooting, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means, said driving means including a reversible drive motor and a member for transmitting the drive of said motor to said shutter means, power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means, electromagnetic means and control means for controlling the electric energy supply to the electromagnetic means; and blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; said blocking means being moved, when continuous shooting, into said second rest position thereof, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control means, thereby permitting the continuous operaTion of said shutter means.
Claim 7
Dependent Claim
241 words
In a photographic camera capable of continuous shooting, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means, said driving means including a reversible drive motor and a member for transmitting the drive of said motor to said shutter means, power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means, electromagnetic means and control means for controlling the electric energy supply to the electromagnetic means; and blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; said blocking means being moved, when continuous shooting, into said second rest position thereof, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control means, thereby permitting the continuous operaTion of said shutter means.
Claim 8
Dependent Claim
227 words
In a photographic camera capable of continuous shooting, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means, power supplying means operatively connected to said driving means for supplying electric energy thereto; said power supplying means including a storage battery, switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means, electromagnetic means and control means for controlling the electric energy supply to the electromagnetic means; and blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; said blocking means being moved, when continuous shooting, into said second rest position thereof, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control means, thereby permitting the continuous operation of said shutter means.
Claim 9
Dependent Claim
227 words
In a photographic camera capable of continuous shooting, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means, power supplying means operatively connected to said driving means for supplying electric energy thereto; said power supplying means including a storage battery, switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means, electromagnetic means and control means for controlling the electric energy supply to the electromagnetic means; and blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; said blocking means being moved, when continuous shooting, into said second rest position thereof, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control means, thereby permitting the continuous operation of said shutter means.
Claim 10
Dependent Claim
389 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; release switch means movable between an OFF position and an ON position for turning the camera into operating condition in response to a shutter releasing operation of said camera; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; a movable member operatively engageable with said switching means for actuating said driving means; actuating means for actuating said movable member to activate said switching means, said actuating means including permanent magnet means and electromagnet means, and said electromagnet means, when energized by said power supplying means, actuating said movable member by interaction between the electromagnetic field provided by said electromagnet means and the magnetic field by said permanent magnet means; blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; and an electromagnetical control circuit controlling the direction of the current through said electromagnetic means so that when said blocking means is moved from said first rest position thereof to said second rest position thereof, the current flows through said electromagnetic means in a first direction, and when said blocking means is moved from said second rest position thereof to said first rest position thereof, the current flows through said electromagnetic means in a second direction opposite to said first direction, thereby changing the polarity of the magnetic poles of said electromagnetic means; said blocking means being moved, when continuously shooting, into second rest position thereof by the movement of said movable member, and being maintaIned at said second rest position even after the electric power supply from said power supplying means is stopped by said control circuit means, thereby permitting the continuous operation of said shutter means.
Claim 11
Dependent Claim
389 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; release switch means movable between an OFF position and an ON position for turning the camera into operating condition in response to a shutter releasing operation of said camera; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; a movable member operatively engageable with said switching means for actuating said driving means; actuating means for actuating said movable member to activate said switching means, said actuating means including permanent magnet means and electromagnet means, and said electromagnet means, when energized by said power supplying means, actuating said movable member by interaction between the electromagnetic field provided by said electromagnet means and the magnetic field by said permanent magnet means; blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having a first rest position for stopping the movement of said shutter means and a second rest position for releasing the movement of the shutter means; and an electromagnetical control circuit controlling the direction of the current through said electromagnetic means so that when said blocking means is moved from said first rest position thereof to said second rest position thereof, the current flows through said electromagnetic means in a first direction, and when said blocking means is moved from said second rest position thereof to said first rest position thereof, the current flows through said electromagnetic means in a second direction opposite to said first direction, thereby changing the polarity of the magnetic poles of said electromagnetic means; said blocking means being moved, when continuously shooting, into second rest position thereof by the movement of said movable member, and being maintaIned at said second rest position even after the electric power supply from said power supplying means is stopped by said control circuit means, thereby permitting the continuous operation of said shutter means.
Claim 12
Dependent Claim
38 words
A combination as defined in claim 1, wherein said blocking means includes a stopper member movable by the interaction of said permanent magnet means and said electromagnetic means engageable with at least a portion of said shutter means.
Claim 13
Dependent Claim
30 words
A combination as defined in claim 1, wherein said shutter means includes a cam member engageable with said blocking means for stopping the shutter means precisely at said predetermined position.
Claim 14
Dependent Claim
33 words
A combination as defined in claim 6, wherein said electromagnetic means further comprises two coils wound substantially at the same place for flowing a respective opposite-directional current therethrough to magnetize said electromagnetic means.
Claim 15
Dependent Claim
365 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supply means to permit the selective supply of electric energy to said driving means; release switch means movable between an OFF position to an ON position for operating the camera; a movable member operative engageable with said switching means for actuating said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means and electromagnetic means having a pair of coils wound around a soft magnetic material, and said electromagnet means, when energized by said power supplying means, actuating said movable member by interaction between electromagnetic field provided by said electromagnet means and magnetic field by said permanent magnet means; blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having first rest position for stopping the movement of said shutter means and second rest position for releasing the movement of the shutter means; and control circuit means including a first capacitor-resistor combination, a first transistor for adjusting the supplying time of electric current to one of said coils, the input voltage of said first transistor being controlled by said first capacitor-resistor combination, a second capacitor-resistor combination and a second transistor for adjusting the supplying time of the electric current to another one of said coils, the input voltage of said second transistor being controlled by said second capacitor-resistor combination; said blocking means being moved, when continuous shooting, into said second rest position thereof by energization of said first coil, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control circuit means, thereby permitting the continuous operation of said shutter means.
Claim 16
Dependent Claim
365 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supply means to permit the selective supply of electric energy to said driving means; release switch means movable between an OFF position to an ON position for operating the camera; a movable member operative engageable with said switching means for actuating said driving means; actuating means for actuating said driving means through said switching means, said actuating means including permanent magnet means and electromagnetic means having a pair of coils wound around a soft magnetic material, and said electromagnet means, when energized by said power supplying means, actuating said movable member by interaction between electromagnetic field provided by said electromagnet means and magnetic field by said permanent magnet means; blocking means actuatable by said actuating means and engageable with at least a portion of said shutter means to fix the shutter means at a predetermined position thereof, and having first rest position for stopping the movement of said shutter means and second rest position for releasing the movement of the shutter means; and control circuit means including a first capacitor-resistor combination, a first transistor for adjusting the supplying time of electric current to one of said coils, the input voltage of said first transistor being controlled by said first capacitor-resistor combination, a second capacitor-resistor combination and a second transistor for adjusting the supplying time of the electric current to another one of said coils, the input voltage of said second transistor being controlled by said second capacitor-resistor combination; said blocking means being moved, when continuous shooting, into said second rest position thereof by energization of said first coil, and being maintained at said second rest position even after the electric energy supply from said power supplying means is stopped by said control circuit means, thereby permitting the continuous operation of said shutter means.
Claim 17
Dependent Claim
305 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable in either direction from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply oF electric energy to said driving means; electromagnet means for selectively actuating said switching means for energizing said driving means in response to a shutter rlease operation of said camera; control circuit means for controlling said electromagnet means, said control circuit means including a pair of capacitor-resistor combinations, a pair of transistors, the input voltages of said transistors being controlled by said capacitor-resistor combinations, respectively, and selector switch means for controlling the introduction of said pairs into said circuit; and blocking means actuatable by said electromagnet means through said control circuit means for blocking said shutter means in either rotational direction thereof, said blocking means having a first rest position for maintaining said switching means at non-actuated condition thereof and stopping the rotational movement of said driving means in either direction, and a second rest position for maintaining said switching means at actuated condition thereof and releasing the rotational movement of said driving means in either direction, said blocking means further comprising a movable portion which is movable into and out of at least a portion of the locus of the rotation of said shutter means , said shutter means having a rotatable portion engageable with said movable portions, thereby stopping the rotational movement of said shutter means in either direction when said two portions are moved to engage each other.
Claim 18
Dependent Claim
305 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable in either direction from a predetermined position for exposing a film; driving means for rotatably driving said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply oF electric energy to said driving means; electromagnet means for selectively actuating said switching means for energizing said driving means in response to a shutter rlease operation of said camera; control circuit means for controlling said electromagnet means, said control circuit means including a pair of capacitor-resistor combinations, a pair of transistors, the input voltages of said transistors being controlled by said capacitor-resistor combinations, respectively, and selector switch means for controlling the introduction of said pairs into said circuit; and blocking means actuatable by said electromagnet means through said control circuit means for blocking said shutter means in either rotational direction thereof, said blocking means having a first rest position for maintaining said switching means at non-actuated condition thereof and stopping the rotational movement of said driving means in either direction, and a second rest position for maintaining said switching means at actuated condition thereof and releasing the rotational movement of said driving means in either direction, said blocking means further comprising a movable portion which is movable into and out of at least a portion of the locus of the rotation of said shutter means , said shutter means having a rotatable portion engageable with said movable portions, thereby stopping the rotational movement of said shutter means in either direction when said two portions are moved to engage each other.
Claim 19
Dependent Claim
227 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; electromagnetic means for controlling said driving means through said switching means; engaging means rotatable integrally with said shutter means; blocking means including a first movable member and a second movable member; and control circuit means having a timing circuit for controlling the energization of said electromagnetic means, said control circuit means permitting, when said switching means is changed from a first position thereof to a second position thereof, electric current through said electromagnet means in the direction to actuate said first movable member, and while said second switch is subsequently maintained at said second position thereof, stopping said electric current through said electromagnet means after an elapse of time determined by said timing circuit, and when said switching means is returned from said second position to said first position, permitting electric current through said electromagnet means in the direction opposite to said direction.
Claim 20
Dependent Claim
227 words
In an electromagnetic shutter release control device for use with a motion picture camera, a combination comprising: shutter means rotatable from a predetermined position for exposing a film; driving means for said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means for connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; electromagnetic means for controlling said driving means through said switching means; engaging means rotatable integrally with said shutter means; blocking means including a first movable member and a second movable member; and control circuit means having a timing circuit for controlling the energization of said electromagnetic means, said control circuit means permitting, when said switching means is changed from a first position thereof to a second position thereof, electric current through said electromagnet means in the direction to actuate said first movable member, and while said second switch is subsequently maintained at said second position thereof, stopping said electric current through said electromagnet means after an elapse of time determined by said timing circuit, and when said switching means is returned from said second position to said first position, permitting electric current through said electromagnet means in the direction opposite to said direction.
Claim 21
Dependent Claim
321 words
In a motion picture camera, an electromagnetic shutter releasing device for electromagnetically releasing a movable shutter from its rest position to expose a film through an aperture and for stopping the shutter at a predetermined position at the end of the exposure, said device comprising: shutter means; driving means for said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; electromagnetic means connected to said power supplying means through said switching means and magnetizable with opposite polarities in response to the changes in the direction of the current through said electromagnetic means; permanent magnet means located adjacent said electromagnetic means to interact with the electromagnetic means; controlling means for controlling the movement of said shutter means, said controlling means having a member movable by the interaction of said electromagnetic means and permanent magnet means, said movable member being movable between a first position for stopping the rotational movement of said shutter means and a second position for permitting the rotational movement of said shutter means; and said movable member being moved, when continuous shooting, into said second position thereof, and being maintained at said second position even after the electric energy supply from said power supplying means is stopped, thereby permitting the continuous operation of said shutter means, adjusting means operatively connected to said movable member for adjusting the attracting force caused by the interaction of said electromagnetic means and said permanent magnet means, said adjusting means including an adjustably contacting member to said movable member, and a setting member to adjustably set said contacting member thereby to enable said electromagnet means to move said movable member only supplying a small current to the electromagnetic means.
Claim 22
Dependent Claim
321 words
In a motion picture camera, an electromagnetic shutter releasing device for electromagnetically releasing a movable shutter from its rest position to expose a film through an aperture and for stopping the shutter at a predetermined position at the end of the exposure, said device comprising: shutter means; driving means for said shutter means; power supplying means operatively connected to said driving means for supplying electric energy thereto; switching means arranged between said driving means and said power supplying means, said switching means connecting and disconnecting said driving means with said power supplying means to permit the selective supply of electric energy to said driving means; electromagnetic means connected to said power supplying means through said switching means and magnetizable with opposite polarities in response to the changes in the direction of the current through said electromagnetic means; permanent magnet means located adjacent said electromagnetic means to interact with the electromagnetic means; controlling means for controlling the movement of said shutter means, said controlling means having a member movable by the interaction of said electromagnetic means and permanent magnet means, said movable member being movable between a first position for stopping the rotational movement of said shutter means and a second position for permitting the rotational movement of said shutter means; and said movable member being moved, when continuous shooting, into said second position thereof, and being maintained at said second position even after the electric energy supply from said power supplying means is stopped, thereby permitting the continuous operation of said shutter means, adjusting means operatively connected to said movable member for adjusting the attracting force caused by the interaction of said electromagnetic means and said permanent magnet means, said adjusting means including an adjustably contacting member to said movable member, and a setting member to adjustably set said contacting member thereby to enable said electromagnet means to move said movable member only supplying a small current to the electromagnetic means.
Claim 23
Dependent Claim
271 words
In an electromagnetic shutter release device for use with a motion picture camera being selectively capable of a single frame exposure and a continuous filming, said device having at least one magnetic circuit including a permanent magnet and an electromagnet, an improvement comprising: permanent magnet means; electromagnet means interacting with said permanent magnetic means; power supplying means for actuating said electromagnet means; movable means driven by the magnetic interaction of said permanent magnet means and said electromagnet means,; shutter release means movable between a first position for releasing the shutter and a second position for stopping the shutter; said movable means having a first position for maintaining said shutter release means in its second position for stopping the shutter and a second position for releasing said shutter release means to release the shutter, said movable means being moved, when continuous shooting, into said second position thereof, and being maintained at said second position even after the electric energy supply from said power supplying means is stopped, thereby permitting the continuous operation of said shutter, switch means actuatable by said movable means when the latter is positioned at its extreme position; and adjusting means for reducing the interaction forces of said electromagnet means and said permanent magnet means, said adjusting means including two independently operable adjusting members, one of which operates to reduce the attractive force between said two magnet means in a direction in which said switch means is actuated and the other of which operates to reduce the attractive force in the opposite direction thereby to enable to move said movable means with a small current supplied to said electromagnet.
Claim 24
Dependent Claim
271 words
In an electromagnetic shutter release device for use with a motion picture camera being selectively capable of a single frame exposure and a continuous filming, said device having at least one magnetic circuit including a permanent magnet and an electromagnet, an improvement comprising: permanent magnet means; electromagnet means interacting with said permanent magnetic means; power supplying means for actuating said electromagnet means; movable means driven by the magnetic interaction of said permanent magnet means and said electromagnet means,; shutter release means movable between a first position for releasing the shutter and a second position for stopping the shutter; said movable means having a first position for maintaining said shutter release means in its second position for stopping the shutter and a second position for releasing said shutter release means to release the shutter, said movable means being moved, when continuous shooting, into said second position thereof, and being maintained at said second position even after the electric energy supply from said power supplying means is stopped, thereby permitting the continuous operation of said shutter, switch means actuatable by said movable means when the latter is positioned at its extreme position; and adjusting means for reducing the interaction forces of said electromagnet means and said permanent magnet means, said adjusting means including two independently operable adjusting members, one of which operates to reduce the attractive force between said two magnet means in a direction in which said switch means is actuated and the other of which operates to reduce the attractive force in the opposite direction thereby to enable to move said movable means with a small current supplied to said electromagnet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |