US4839677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focal length switching type camera
Assignee: Konica Minolta Inc
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Filing: 1987-02-26
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Granted: 1989-06-13
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Expires: 2007-02-26
Abstract
Abstract A focal length switching type camera wherein the focal length switching operation is initiated by a focal length switching and operating device, and a motor for driving a moving device is energized according to information from the focal length switching and operating device. The moving device moves a lens unit for holding a lens in a direction of an optical axis.
Inventors
- 👤 Yasushi Hoshino
- 👤 Masamori Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:36
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04; G03B19/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
In a focal length switching type camera comprising moving means for moving a lens unit for holding a lens in a direction of an optical axis, operating means for actuating said moving means, and control means for controlling the operation of said moving means, whereby the lens unit is moved by said moving means to change the focal length, the improvement characterized by comprising battery checking means for judging whether or not a voltage of a battery is lower than a predetermined reference voltage, wherein a driving voltage of a motor for driving said moving means is set to a voltage lower than the reference voltage of said battery checking means.
Claim 2
Dependent Claim
111 words
In a focal length switching type camera comprising moving means for moving a lens unit for holding a lens in a direction of an optical axis, operating means for actuating said moving means, and control means for controlling the operation of said moving means, whereby the lens unit is moved by said moving means to change the focal length, the improvement characterized by comprising battery checking means for judging whether or not a voltage of a battery is lower than a predetermined reference voltage, wherein a driving voltage of a motor for driving said moving means is set to a voltage lower than the reference voltage of said battery checking means.
Claim 3
Dependent Claim
25 words
The camera as set forth in claim 1 wherein said battery checking means is actuated by the first stage operation of said release operating means.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |