Patent US3757655A successfully refreshed from Google Patents.
US3757655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically controlled camera shutter
Assignee: Minolta Co Ltd
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Filing: 1971-12-16
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Granted: 1973-09-11
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Expires: 1991-12-16
Abstract
Abstract An electronically controlled shutter comprises a braking mechanism for braking the movement of a sector opening member so as to open the shutter diaphragm sectors at a lower speed than when they are closed, a diaphragm setting member for manually setting the diaphragm aperture value and a photoreceptor for measuring the light reflected from the film surface so as to automatically control exposure by integrating the output of the photoreceptor. The shutter further includes a mechanism for selectively enabling or disabling the braking mechanism, whereby the shutter is adapted for both programming exposure and diaphragm preset exposure.
Inventors
- 👤 T Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:40
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/64; G03B7/00; G03B7/08; G03B7/081; G03B7/087
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
200 words
An electronically controlled shutter for a camera having a shutter including blades functioning as diaphragm and shutter blades comprising: means including an opening member for driving said shutter blades in an opening direction, braking means for braking the movement of said opening member, diaphragm setting means having a stopping portion for intermediately halting the opening movement of said opening member, said diaphragm setting means being adjustable to permit said stopping portion to halt said opening member when said shutter blades have opened to a preset diaphragm aperture, photoreceptor means including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of said shutter blades opening to produce an output in accordance with the intensity of the incident light, an electromagnet, an exposure time control electric circuit means comprising an integration network including a capacitor for controlling said electromagnet in response to the integration of said output to thereby automatically control the exposure time, and means including a closing member actuated by said electromagnet when the voltage across said capacitor has reached a predetermined level so as to drive at least some of said shutter blades in a closing direction.
Claim 2
Dependent Claim
200 words
An electronically controlled shutter for a camera having a shutter including blades functioning as diaphragm and shutter blades comprising: means including an opening member for driving said shutter blades in an opening direction, braking means for braking the movement of said opening member, diaphragm setting means having a stopping portion for intermediately halting the opening movement of said opening member, said diaphragm setting means being adjustable to permit said stopping portion to halt said opening member when said shutter blades have opened to a preset diaphragm aperture, photoreceptor means including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of said shutter blades opening to produce an output in accordance with the intensity of the incident light, an electromagnet, an exposure time control electric circuit means comprising an integration network including a capacitor for controlling said electromagnet in response to the integration of said output to thereby automatically control the exposure time, and means including a closing member actuated by said electromagnet when the voltage across said capacitor has reached a predetermined level so as to drive at least some of said shutter blades in a closing direction.
Claim 3
Dependent Claim
25 words
The electronically controlled shutter as set forth in claim 1 wherein said shutter opening blades and said shutter closing blades comprise the same shutter blades.
Claim 4
Dependent Claim
37 words
The electronically controlled shutter as set forth in claim 1 wherein said diaphragm setting means has comprises means having a control portion for controlling the engagement and disengagement between said sector opening member and said braking means.
Claim 5
Dependent Claim
106 words
The electronically controlled shutter as set forth in claim 3 including means for selectively setting the shutter in an exposuRe programming position and in a plurality of diaphragm preset exposure positions by adjusting said diaphragm setting means whereby when the shutter is set at the programming position said control portion functions to cause said braking means to brake the movement of said opening member and when the shutter is set at a diaphragm preset exposure position said opening member is free of braking action to permit said shutter opening blades to progressively open to define the preset diaphragm aperture, whereupon said blades come to a halt.
Claim 6
Dependent Claim
176 words
An electronically controlled shutter for a camera including shutter and diaphragm functioning blades comprising: an opening member for driving at least some of said blades in an opening direction, braking means for braking the movement of said opening member, a means including a manually operable changeover member for selectively engaging said braking means with or disengaging said braking means from said opening member, photoreceptor means including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of said shutter blades opening to produce an output in accordance with the intensity of the incident light, an electromagnet, an exposure time control electric circuit means comprising an integration network including a capacitor for controlling said electromagnet in response to the integration of said output to thereby automatically control exposure time, and means including a sector closing member actuated by said electromagnet when the voltage across said capacitor has reached a predetermined level so as to drive at least some of said shutter blades in a closing direction.
Claim 7
Dependent Claim
176 words
An electronically controlled shutter for a camera including shutter and diaphragm functioning blades comprising: an opening member for driving at least some of said blades in an opening direction, braking means for braking the movement of said opening member, a means including a manually operable changeover member for selectively engaging said braking means with or disengaging said braking means from said opening member, photoreceptor means including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of said shutter blades opening to produce an output in accordance with the intensity of the incident light, an electromagnet, an exposure time control electric circuit means comprising an integration network including a capacitor for controlling said electromagnet in response to the integration of said output to thereby automatically control exposure time, and means including a sector closing member actuated by said electromagnet when the voltage across said capacitor has reached a predetermined level so as to drive at least some of said shutter blades in a closing direction.
Claim 8
Dependent Claim
25 words
The electronically controlled shutter as set forth in claim 5 wherein said opening shutter blades and said closing shutter blades comprise the same shutter blades.
Claim 9
Dependent Claim
173 words
An electronically controlled shutter for a camera including shutter sectors comprising: means including a sector opening member for driving at least some of said sectors in an opening direction, means including a sector closing member for driving at least some of said sectors in a closing direction, braking means for braking the movement of said sector opening member so as to open said sectors at a lower speed than when said sectors are closed, photoreceptor means including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of opening of said sectors to produce an electrical output in accordance with the intensity of the incident light, an electromagnet, and an exposure time control electric circuit means comprising an integrating network including a capacitor for controlling said electromagnet in response to the integration of said output to automatically control exposure time whereby when the voltage across said capacitor reaches a predetermined level said electromagnet causes the sector driving member to close said sectors.
Claim 10
Dependent Claim
173 words
An electronically controlled shutter for a camera including shutter sectors comprising: means including a sector opening member for driving at least some of said sectors in an opening direction, means including a sector closing member for driving at least some of said sectors in a closing direction, braking means for braking the movement of said sector opening member so as to open said sectors at a lower speed than when said sectors are closed, photoreceptor means including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of opening of said sectors to produce an electrical output in accordance with the intensity of the incident light, an electromagnet, and an exposure time control electric circuit means comprising an integrating network including a capacitor for controlling said electromagnet in response to the integration of said output to automatically control exposure time whereby when the voltage across said capacitor reaches a predetermined level said electromagnet causes the sector driving member to close said sectors.
Claim 11
Dependent Claim
20 words
The electronically controlled shutter as set forth in claim 7 wherein said sectors serve as diaphragm blades and shutter blades.
Claim 12
Dependent Claim
25 words
The electronically controlled shutter as set forth in claim 8 including diaphragm setting means for manually presetting a diaphragm aperture for the camera objective lens.
Claim 13
Dependent Claim
38 words
The electronically controlled shutter as set forth in claim 9 wherein said diaphragm setting means includes means for stopping the opening movement of said sectors when the diaphragm aperture of said sectors reaches the preset diaphragm aperture value.
Claim 14
Dependent Claim
64 words
The electronically controlled shutter as set forth in claim 7 wherein said control circuit includes a switch, said electromagnet being energized by the closing of said switch and deenergized upon the voltage across said capacitor exceeding said predetermined level, said sector opening member being actuated by the energization of said electromagnet and said sector closing member being acTuated by the de-energization of said electromagnet.
Claim 15
Dependent Claim
128 words
The electronically controlled shutter as set forth in claim 11 including a latch member movable between advanced and retracted positions and wherein said sector opening member is normally latched in its operation initiating position by said retracted latch member and is released for opening movement by said latch member being attracted and advanced upon the energization of said electromagnet, and said sector closing member being latched in its cocked position by said sector opening member and released from the latched position upon the initial advance of said sector opening member for movement to a latched position by said latch member after making a slight rotation, said sector closing member instantaneously moving in the sector closing direction upon said latch member being retracted upon the de-energization of said electromagnet.
Claim 16
Dependent Claim
62 words
The electronically controlled shutter as set forth in claim 12 wherein said sector opening member drives said sectors in their opening direction while being braked by said braking means during its forward movement and is instantaneously returned to its operation initiating position by said sector closing member to close said sectors when said sector closing member is unlatched from said latch member.
Claim 17
Dependent Claim
36 words
The electronically controlled shutter as claimed in claim 9 including means for enabling and disabling said braking means so as to selectively alternatively brake said sector opening member or free the same from its braking action.
Claim 18
Dependent Claim
32 words
The electronically controlled shutter as claimed in claim 14 wherein said braking means is engaged with or disengaged from said sector opening member under the control of said manual diaphragm setting means.
Claim 19
Dependent Claim
17 words
The electronically controlled shutter as set forth in claim 7, wherein said photocell comprises a photovoltaic cell.
Claim 20
Dependent Claim
37 words
The electronically controlled shutter as set forth in claim 16 further comprising means including a constant current circuit (R1, R2, C) for coupling the output of said photocell (5) to said integration circuit (C) as constant current.
Claim 21
Dependent Claim
169 words
An electronically controlled shutter for a photographic camera including shutter exposure and closing blades comprising: an opening means for driving said exposure blades in their opening direction; a closing means for driving said closing blades in their closing direction; governor means for governing the movement of said opening means so as to open said exposure blades at a lower speed than the closing speed of said closing blades; means including a photoreceptor including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of opening of said exposure blades to produce an output in accordance with the intensity of the incident light; an electromagnet, and an exposure time control electric circuit means for controlling said electromagnet comprising an integration circuit including a capacitor for integrating the output of said photocell to thereby automatically control exposure time whereby when the voltage across said capacitor reaches a predetermined level, said electromagnet causes said closing means to close said closing blades.
Claim 22
Dependent Claim
169 words
An electronically controlled shutter for a photographic camera including shutter exposure and closing blades comprising: an opening means for driving said exposure blades in their opening direction; a closing means for driving said closing blades in their closing direction; governor means for governing the movement of said opening means so as to open said exposure blades at a lower speed than the closing speed of said closing blades; means including a photoreceptor including a photocell for receiving and measuring the reflected light from the surface of film in said camera simultaneously with the start of opening of said exposure blades to produce an output in accordance with the intensity of the incident light; an electromagnet, and an exposure time control electric circuit means for controlling said electromagnet comprising an integration circuit including a capacitor for integrating the output of said photocell to thereby automatically control exposure time whereby when the voltage across said capacitor reaches a predetermined level, said electromagnet causes said closing means to close said closing blades.
Claim 23
Dependent Claim
34 words
The electronically controlled shutter as set forth in claim 18, further comprising means including a constant current circuit (R1, R2, C) for coupling the output of said photocell (5) to said integration circuit (C).
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |