US4682873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photometric device for camera
Assignee: Canon Inc
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Filing: 1985-08-27
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Granted: 1987-07-28
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Expires: 2005-08-27
Abstract
Abstract A photometric device disposed in the optical path of a view finder of a camera includes a photometric element which includes a plurality of minute photo-electric conversion elements. Each of the minute photometric elements is formed by a minute transparent electrode, a minute photo-electric converter, a minute opaque electrode and a transparent substrate which are arranged in that order from the side of a photo-taking lens.
Inventors
- 👤 Hiroshi Ohmura
- 👤 Tokuichi Tsunekawa
- 👤 Shyuichi Kiyohara
- 👤 Takashi Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:17
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09976
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
110 words
A photometric device usable in a single lens reflex camera having a viewfinder system into which an object light from a photo-taking lens is introduced, comprising: a photo-electric conversion element construction for measuring object light, said photo-electric conversion element construction comprising a transparent substrate and a photo-electric converter sandwiched between a transparent electrode and an opaque electrode laminated on the substrate, wherein said photo-electric conversion element construction is disposed in the optical path of said viewfinder system, and said transparent electrode, said photo-electric converter said opaque electrode and said transparent substrate are laminated in the recited order in the direction of incidence of the object light from said photo-taking lens.
Claim 2
Dependent Claim
110 words
A photometric device usable in a single lens reflex camera having a viewfinder system into which an object light from a photo-taking lens is introduced, comprising: a photo-electric conversion element construction for measuring object light, said photo-electric conversion element construction comprising a transparent substrate and a photo-electric converter sandwiched between a transparent electrode and an opaque electrode laminated on the substrate, wherein said photo-electric conversion element construction is disposed in the optical path of said viewfinder system, and said transparent electrode, said photo-electric converter said opaque electrode and said transparent substrate are laminated in the recited order in the direction of incidence of the object light from said photo-taking lens.
Claim 3
Dependent Claim
26 words
A device according to claim 1, wherein said photo-electric conversion element construction is disposed at a position deviated from a focusing position of said viewfinder system.
Claim 4
Dependent Claim
23 words
A device according to claim 1, wherein said transparent electrode, said photo-electric converter and said opaque electrode are formed in a fine line.
Claim 5
Dependent Claim
32 words
A device according to claim 3, wherein said electrodes and photo-electric converters are arranged in the middle part of an object light region of said viewfinder system and around said middle part.
Claim 6
Dependent Claim
21 words
A device according to claim 3, wherein said electrodes and photo-electric converters are formed in a line not exceeding several μm.
Claim 7
Dependent Claim
38 words
A device according to claim 3, wherein said electrodes and photo-electric converters are arranged to extend into different areas of the region in the optical path of said viewfinder system in the form of a plurality of blocks.
Claim 8
Dependent Claim
30 words
A device according to claim 3, wherein said electrodes and photo-electric converters are formed in irregular shapes spreading all over the region of the optical path of said viewfinder system.
Claim 9
Dependent Claim
17 words
A device according to claim 1, wherein said photo-electric converter is made of an amorphous silicon material.
Claim 10
Dependent Claim
118 words
A photometric device usable in a single lens reflex camera having a viewfinder system into which an object light from a photo-taking lens is introduced, comprising: a photo-electric conversion element construction for measuring object light, said photo-electric conversion element construction comprising a transparent optical member including a transparent substrate, and a photo-electric converter sandwiched between a transparent electrode and an opaque electrode laminated on said transparent optical member, wherein said photo-electric conversion element construction is disposed in the optical path of said viewfinder system, and said transparent electrode, said photo-electric converter, said opaque electrode and said transparent optical member are laminated in the recited order in the direction of incidence of said object light from the photo-taking lens.
Claim 11
Dependent Claim
118 words
A photometric device usable in a single lens reflex camera having a viewfinder system into which an object light from a photo-taking lens is introduced, comprising: a photo-electric conversion element construction for measuring object light, said photo-electric conversion element construction comprising a transparent optical member including a transparent substrate, and a photo-electric converter sandwiched between a transparent electrode and an opaque electrode laminated on said transparent optical member, wherein said photo-electric conversion element construction is disposed in the optical path of said viewfinder system, and said transparent electrode, said photo-electric converter, said opaque electrode and said transparent optical member are laminated in the recited order in the direction of incidence of said object light from the photo-taking lens.
Claim 12
Dependent Claim
34 words
A device according to claim 9, wherein said optical member has a region as large as the optical path of said object light and is composed of a glass substrate and a transparent electrode.
Claim 13
Dependent Claim
20 words
A device according to claim 9, wherein said electrodes and said photo-electric converter are protected by a transparent protection film.
Claim 14
Dependent Claim
86 words
A photometric device usable in a single lens reflex camera having a viewfinder system into which an object light of a photo-taking lens is introduced, comprising: an electric conversion element construction for measuring object light, said construction comprising a transparent optical member and a photo-electric converter laminated on said transparent optical member, and being disposed in the optical path of said viewfinder system; and a plurality of grooves formed on both sides of said transparent optical member and located outside the region of said photo-electric converter.
Claim 15
Dependent Claim
86 words
A photometric device usable in a single lens reflex camera having a viewfinder system into which an object light of a photo-taking lens is introduced, comprising: an electric conversion element construction for measuring object light, said construction comprising a transparent optical member and a photo-electric converter laminated on said transparent optical member, and being disposed in the optical path of said viewfinder system; and a plurality of grooves formed on both sides of said transparent optical member and located outside the region of said photo-electric converter.
Claim 16
Dependent Claim
14 words
A device according to claim 12, wherein said optical member is a transparent substrate.
Claim 17
Dependent Claim
17 words
A device according to claim 12, wherein said photo-electric converter is formed by an amorphous silicon material.
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) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |