US4634253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater photographable camera
Assignee: Canon Inc
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Filing: 1984-01-17
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Granted: 1987-01-06
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Expires: 2004-01-17
Abstract
Abstract A camera of waterproof construction permitting underwater photography includes focusing means for adjustment of the focal point of a photo-taking lens and operation means for adjusting the focal point of the lens to a predetermined position suited for underwater photography.
Inventors
- 👤 Hideo Tamamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:44
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
In a camera capable of underwater photography, the improvement comprising: (a) automatic focusing adjustment means for automatically performing the focusing adjustment of a photographic lens; and (b) restricting means for restricting focusing positions to which said photographic lens is to be set so that focusing is not effected to farther distances than a prescribed value when in underwater photography, whereby said restricting means allows for said automatic focusing adjustment means to operate when the measured value of the object distance is shorter than said prescribed one.
Claim 2
Dependent Claim
86 words
In a camera capable of underwater photography, the improvement comprising: (a) automatic focusing adjustment means for automatically performing the focusing adjustment of a photographic lens; and (b) restricting means for restricting focusing positions to which said photographic lens is to be set so that focusing is not effected to farther distances than a prescribed value when in underwater photography, whereby said restricting means allows for said automatic focusing adjustment means to operate when the measured value of the object distance is shorter than said prescribed one.
Claim 3
Dependent Claim
31 words
A camera according to claim 1, wherein said restricting means includes switching means arranged upon attachment of an accessory for underwater photography to said camera to render operative said restricting means.
Claim 4
Dependent Claim
26 words
A camera according to claim 2, wherein said restricting means is arranged to operate in association with an accessory mounted on the camera for underwater photography.
Claim 5
Dependent Claim
29 words
A camera according to claim 1, wherein said restricting means includes detecting means responsive to the fact that said camera lies under water for rendering operative said restricting means.
Claim 6
Dependent Claim
23 words
A camera according to claim 4, wherein said detecting means includes switching means arranged to be rendered conductive by the medium of water.
Claim 7
Dependent Claim
22 words
A camera according to claim 4, wherein said detecting means includes pressure sensitive means arranged to be rendered conductive by water pressure.
Claim 8
Dependent Claim
13 words
A camera according to claim 1, wherein said restricting means includes electromagnetic means.
Claim 9
Dependent Claim
36 words
A camera according to claim 1, wherein said photographic lens is arranged to be set by said restricting means at a focusing position for photographic objects located at distances from 0.7 to 4 m or thereabout.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |