Patent US4170410A successfully refreshed from Google Patents.
US4170410A
Expired / Lapsed
US
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Light measuring devices for cameras with automatic exposure control
Assignee: Minolta Co Ltd
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Filing: 1977-02-15
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Granted: 1979-10-09
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Expires: 1997-02-15
Abstract
Abstract A light measuring device for a camera with automatic exposure control is provided with a light responsive element and a light reflecting optical element, such as a mirror or a transparent block having a light reflecting surface, both elements being disposed outside of the light path from the objective lens to the focal plane for exposure of the film. The light reflecting optical element faces a certain area of the focal plane to receive the light reflected at the surface of the leading shutter member of a focal plane shutter device and/or the surface of the film. The light responsive element faces the optical element to receive the light reflected thereby.
Inventors
- 👤 Minoru Sekida
- 👤 Kazuo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:02
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09974
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
217 words
In a camera with automatic exposure control, including an objective lens, a camera body with film loaded at the focal plane of said objective lens, and a focal plane shutter having a leading shutter member and a trailing shutter member controlling the light reaching said film, a light measuring device for automatic exposure control, comprising: light reflecting optical means facing a predetermined area of said focal plane to reflect light passing through said objective lens and reflected at a surface of said leading shutter member and/or a surface of said film, said light reflecting optical means including a transparent block having a light incident surface facing said predetermined area of said focal plane to receive the light reflected by the surface of said leading shutter member and/or the surface of said film, a light reflecting surface for reflecting the light passing through said light incident surface, and a light exit surface from which the light reflected by said light reflecting surface emerges; and light responsive means facing said light exit surface of said transparent block to receive the light reflected by said light reflecting surface for generating an output for automatic exposure control, said light reflecting optical means and said light responsive means being disposed outside the light path from said objective lens to said focal plane.
Claim 2
Dependent Claim
217 words
In a camera with automatic exposure control, including an objective lens, a camera body with film loaded at the focal plane of said objective lens, and a focal plane shutter having a leading shutter member and a trailing shutter member controlling the light reaching said film, a light measuring device for automatic exposure control, comprising: light reflecting optical means facing a predetermined area of said focal plane to reflect light passing through said objective lens and reflected at a surface of said leading shutter member and/or a surface of said film, said light reflecting optical means including a transparent block having a light incident surface facing said predetermined area of said focal plane to receive the light reflected by the surface of said leading shutter member and/or the surface of said film, a light reflecting surface for reflecting the light passing through said light incident surface, and a light exit surface from which the light reflected by said light reflecting surface emerges; and light responsive means facing said light exit surface of said transparent block to receive the light reflected by said light reflecting surface for generating an output for automatic exposure control, said light reflecting optical means and said light responsive means being disposed outside the light path from said objective lens to said focal plane.
Claim 3
Dependent Claim
36 words
A light measuring device as in claim 1, wherein said light reflecting optical means converges light reflected at the surface of said leading shutter member and/or the surface of said film onto said light responsive means.
Claim 4
Dependent Claim
22 words
A light measuring device as in claim 1, wherein said transparent block includes a portion thereof for securing to said camera body.
Claim 5
Dependent Claim
18 words
A light measuring device as in claim 3, wherein said transparent block is made of a plastic material.
Claim 6
Dependent Claim
23 words
A light measuring device as in claim 1, wherein said transparent block includes a portion thereof for securing said light responsive means thereto.
Claim 7
Dependent Claim
18 words
A light measuring device as in claim 5, wherein said transparent block is made of a plastic material.
Claim 8
Dependent Claim
29 words
A light measuring device as in claim 1, wherein said transparent block as a whole converges the light incident on said light incident surface onto said light responsive means.
Claim 9
Dependent Claim
19 words
A light measuring device as in claim 7, wherein said light reflecting surface of said transparent block is concave.
Claim 10
Dependent Claim
19 words
A light measuring device as in claim 8, wherein said light incident surface of said transparent block is planar.
Claim 11
Dependent Claim
20 words
A light measuring device as in claim 8, wherein said light reflecting surface of said transparent block is coaxially terraced.
Claim 12
Dependent Claim
19 words
A light measuring device as in claim 7, wherein said light incident surface of said transparent block is convex.
Claim 13
Dependent Claim
15 words
A light measuring device as in claim 11, wherein said light reflecting surface is planar.
Claim 14
Dependent Claim
27 words
A light measuring device as in claim 1, wherein said transparent block and said light responsive means are disposed below the optical axis of said objective lens.
Claim 15
Dependent Claim
53 words
A light measuring device as in claim 13, wherein said light incident surface of said transparent block is inclined with respect to said focal plane to reflect the light normally reflected at a lower part of the surface of said leading shutter member and/or a lower part of the surface of said film.
Claim 16
Dependent Claim
47 words
A light measuring device as in claim 1, wherein said first incident surface of said transparent block faces said light reflecting surface and said light exit surface of said transparent block to totally reflect the light reflected by said light reflecting surface to said light exit surface.
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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |