US5065177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
SLR camera with auxiliary light emitter
Assignee: Pentax Corp
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Filing: 1990-07-09
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Granted: 1991-11-12
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Expires: 2010-07-09
Abstract
Abstract A pop-up flash unit 20 for an SLR camera includes an integral auxiliary light emitting device 26 for projecting a predetermined pattern along the camera lens axis to provide sufficient auto-focusing contrast. A triangular prism 60 forms a window in a front wall 16a of the flash unit chamber 16 confronting the condenser lens 25 of the auxiliary light emitting device such that the predetermined pattern projected by the downwardly angled emitting device, when the flash unit is retracted, is bent upwardly to still fall along the camera lens axis.
Inventors
- 👤 Masato Yamamoto
- 👤 Masahiro Nakajima
- 👤 Toshimasa Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:26
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
An auxiliary light emitting device for a single-lens reflex camera which includes an automatic focus control device for detecting the focusing condition of an object to be photographed, comprising: a flash unit (20) mounted to a body of said camera and selectively movable between a retracted position with said body and raised position, a predetermined pattern projecting unit (26) disposed adjacent to a light emitting section of said flash unit and unitary with said flash unit for projecting a predetrmined pattern towards said object, and bending means for bending a pattern projected by said projecting unit upwardly when said flash unit is in said retracted position such that an image of said predetrmined pattern is formed along an optical axis of a camera lens to provide sufficient contrast for automatic focusing.
Claim 2
Dependent Claim
131 words
An auxiliary light emitting device for a single-lens reflex camera which includes an automatic focus control device for detecting the focusing condition of an object to be photographed, comprising: a flash unit (20) mounted to a body of said camera and selectively movable between a retracted position with said body and raised position, a predetermined pattern projecting unit (26) disposed adjacent to a light emitting section of said flash unit and unitary with said flash unit for projecting a predetrmined pattern towards said object, and bending means for bending a pattern projected by said projecting unit upwardly when said flash unit is in said retracted position such that an image of said predetrmined pattern is formed along an optical axis of a camera lens to provide sufficient contrast for automatic focusing.
Claim 3
Dependent Claim
41 words
An auxiliary light emitting device as claimed in claim 1, wherein said predetermined pattern projecting unit includes means for projecting a predetermined pattern and a condenser lens disposed in front of said means for forming an image of said predetermined pattern.
Claim 4
Dependent Claim
18 words
An auxiliary light emitting device as claimed in claim 2, wherein said bending means comprises a triangular prism.
Claim 5
Dependent Claim
64 words
An auxiliary light emitting device as claimed in claim 2, wherein, with said flash unit in said raised position, a straight line which intersects an optical center of said condenser lens and is perpendicular to the optical axis of said projecting unit, and a prolongation of a plane of said predetermined pattern, meet at a point on the optical axis of said camera lens.
Claim 6
Dependent Claim
45 words
An auxiliary light emitting device as claimed in claim 3, wherein said flash unit is accommodated in a chamber (16) of the camera body in the retracted position, and the prism is mounted in a window opening of a front wall (16a) of said chamber.
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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) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |