Patent US4671639A successfully refreshed from Google Patents.
US4671639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera with electromagnetically driven lens barrel
Assignee: Canon Inc
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Filing: 1986-04-23
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Granted: 1987-06-09
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Expires: 2006-04-23
Abstract
Abstract In a camera which is provided with an electromagnetically driven lens barrel and is arranged to control a shutter by driving a rotor with an electromagnetic force generated by energizing a coil printed on the rotor, power supply to the coil is effected in a pulse-like manner for drawing out a photo-taking lens and in a continuous manner for driving the shutter.
Inventors
- 👤 Takanori Kodaira
- 👤 Akira Egawa
- 👤 Akihiro Namai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:01
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
164 words
A camera having an electromagnetically driven lens barrel, comprising: a drive member to be moved from a first position to a second position thereof by an electromagnetic force, said drive member a coil to have said electromagnetic force generated when power supply is effected to said coil, and said drive member being arranged to come back from said second position to said first position when said power supply to said coil is cut off; lens barrel step-advance means for step-advancing said lens barrel in response to the last stroke of movement of said drive member from said second position to said first position; shutter operating means arranged to operate in response to the movement of said drive member from said first position to said second, said shutter operating means being arranged to perform a shutter opening operation while said drive member is in said second position for a time longer than a predetermined time; and control means for controlling power supply to said coil.
Claim 2
Dependent Claim
164 words
A camera having an electromagnetically driven lens barrel, comprising: a drive member to be moved from a first position to a second position thereof by an electromagnetic force, said drive member a coil to have said electromagnetic force generated when power supply is effected to said coil, and said drive member being arranged to come back from said second position to said first position when said power supply to said coil is cut off; lens barrel step-advance means for step-advancing said lens barrel in response to the last stroke of movement of said drive member from said second position to said first position; shutter operating means arranged to operate in response to the movement of said drive member from said first position to said second, said shutter operating means being arranged to perform a shutter opening operation while said drive member is in said second position for a time longer than a predetermined time; and control means for controlling power supply to said coil.
Claim 3
Dependent Claim
70 words
A camera according to claim 1, wherein said control means is arranged to cause said power supply to said coil to be effected in a pulse-like manner for having said lens barrel step-advanced by said lens barrel step-advnace means; and to cause said power supply to said coil to be effected for a time longer than the predetermined time for having said shutter operating means perform said shutter opening operation.
Claim 4
Dependent Claim
50 words
A camera according to claim 2, further comprising distance measuring means for measuring a distance to an object to be photographed; and wherein said control means is arranged to determine pulses to be produced therefrom on the basis of the result of distance measurement performed by said distance measuring means.
Claim 5
Dependent Claim
70 words
A camera according to claim 2, wherein said control means includes returning power supply means which is arranged to effect power supply to said coil in a pulse-like manner for causing said lens barrel step-advance means to perform a returning operation on said lens barrel; and to operate after the operation of said shutter operating means to cause said lens barrel to be brought back to the initial position thereof.
Claim 6
Dependent Claim
37 words
A camera according to claim 4, wherein said returning power supply means includes a switch which is arranged to render said returning power supply means inoperative and to be operated by the return of said lens barrel.
Claim 7
Dependent Claim
151 words
A drive device for a photographic optical system in a camera, comprising: (A) an optical system adjustable in focal point by changing in position; (B) a shutter; (C) drive means for focal adjustment, which moves in a predetermined direction from its initial position by a predetermined current passage thereto, returns to the initial position by stoppage of the predetermined current passage and changes the position of the photographic optical system during the return to the initial position to perform the focal adjustment, said drive means opening the shutter when the predetermined current passage is effected longer than a predetermined time; and (D) control means for controlling the time of the current passage to the drive means longer than the predetermined time, said control means allowing the current passage to the drive means for a time longer than the predetermined time after completion of the focal adjustment of the photographic optical system.
Claim 8
Dependent Claim
151 words
A drive device for a photographic optical system in a camera, comprising: (A) an optical system adjustable in focal point by changing in position; (B) a shutter; (C) drive means for focal adjustment, which moves in a predetermined direction from its initial position by a predetermined current passage thereto, returns to the initial position by stoppage of the predetermined current passage and changes the position of the photographic optical system during the return to the initial position to perform the focal adjustment, said drive means opening the shutter when the predetermined current passage is effected longer than a predetermined time; and (D) control means for controlling the time of the current passage to the drive means longer than the predetermined time, said control means allowing the current passage to the drive means for a time longer than the predetermined time after completion of the focal adjustment of the photographic optical system.
Claim 9
Dependent Claim
21 words
A drive device according to claim 6, wherein the drive means includes electromagnetic drive means for driving by an electromagnetic force.
Claim 10
Dependent Claim
24 words
A drive device according to claim 6, wherein the drive means includes an elastic member for returning the drive means to the initial position.
Claim 11
Dependent Claim
38 words
A drive device according to claim 6, wherein the control means repeats the predetermined current passage to the drive means, thereby changing in a step-wise manner the position of the photographic optical system to perform the focal adjustment.
Claim 12
Dependent Claim
45 words
A drive device according to claim 9, wherein the control means includes retrun means for returning the photographic optical system to the initial position by changing in a step-wise manner the position of the photographic optical system again after the completion of the exposure operation.
Claim 13
Dependent Claim
36 words
A drive device according to claim 10, wherein the control means includes switch means for disabling the operation of the return menas in response to the return of the photographic optical system to the initial position.
Claim 14
Dependent Claim
50 words
A drive device according to claim 6, wherein the drive means includes a rotary member which rotates by current passage thereto and a drive member which changes the position of the photographic optical system in engagement with the rotary member, said rotary member and the drive member being coaxially supported.
Claim 15
Dependent Claim
121 words
A drive device for an optical system in a camera, comprising: (A) an optical system variable in position; (B) a ratchet member for changing the position of the photographic optical system by movement thereof; (C) drive means which changes in position from its initial position in a predetermined direction by a predetermined current passage thereto; (D) an elastic member for returning the drive means to the initial position; (E) an association member for moving the ratchet member in response to the returning of the drive means; and (F) control means for changing in a step-wise manner the position of the ratchet member by repeating the current passage to the drive means in cooperation with the elastic force of the elastic member.
Claim 16
Dependent Claim
121 words
A drive device for an optical system in a camera, comprising: (A) an optical system variable in position; (B) a ratchet member for changing the position of the photographic optical system by movement thereof; (C) drive means which changes in position from its initial position in a predetermined direction by a predetermined current passage thereto; (D) an elastic member for returning the drive means to the initial position; (E) an association member for moving the ratchet member in response to the returning of the drive means; and (F) control means for changing in a step-wise manner the position of the ratchet member by repeating the current passage to the drive means in cooperation with the elastic force of the elastic member.
Claim 17
Dependent Claim
23 words
A drive device according to claim 13, wherein the drive means includes electromagnetic drive means for driving by an electromagnetic drive means for
Claim 18
Dependent Claim
22 words
A drive device according to claim 13, wherein the drive means and the association member are rotatable around the same rotation center.
Claim 19
Dependent Claim
116 words
A drive device for an optical system in a camera, comprising: (A) electromagnetic drive means which rotates in predetermined direction from an initial position by an electromagnetic force; (B) control means for rotating the electromagnetic drive means in normal and reverse directions by repeating the current passage to the electromagnetic drive means and (C) ratchet means for moving in a step-wise manner the optical system by a driving force given by the normal and reverse rotation of the electromagnetic drive means, said ratchet means including a drive member which is rotatable around the same rotation center as that of the electromagnetic drive means and to which the driving force of the electromagnetic drive means is transmitted.
Claim 20
Dependent Claim
116 words
A drive device for an optical system in a camera, comprising: (A) electromagnetic drive means which rotates in predetermined direction from an initial position by an electromagnetic force; (B) control means for rotating the electromagnetic drive means in normal and reverse directions by repeating the current passage to the electromagnetic drive means and (C) ratchet means for moving in a step-wise manner the optical system by a driving force given by the normal and reverse rotation of the electromagnetic drive means, said ratchet means including a drive member which is rotatable around the same rotation center as that of the electromagnetic drive means and to which the driving force of the electromagnetic drive means is transmitted.
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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |