US4456352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light receiving apparatus for use in single-lens reflex camera
Assignee: Canon Inc
•
Filing: 1982-02-24
•
Granted: 1984-06-26
•
Expires: 2002-02-24
Abstract
Abstract A light receiving apparatus for use in single-lens reflex camera is disclosed. A beam splitter is disposed between the swing-up mirror of the camera and the film plane to divide the light transmitted through the taking lens into a plural number of beams. To receive the divided beams there are provided a plural number of photoreceptors in the respective optical paths of the divided beams.
Inventors
- 👤 Yasuhisa Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:39
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09972
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
207 words
A single lens reflex camera, comprising: a picture-taking optical system for forming an image of an object on an image forming plane; first means for directing the light transmitted through said picture-taking optical system to a view-finder optical system, said first means being movable between a first position for reflecting the light from said picture-taking optical system to said view-finder optical system and a second position for directing the light from said picture-taking optical system to the image forming plane, said first means having a semi-transmitting area formed in at least a portion thereof for passing therethrough at least a portion of the light from said picture-taking optical system; and second means for reflecting the light transmitted through said semi-transmitting area of said first means in a direction other than the direction towards the image forming plane when said first means is in said first position, said second means having a plurality of reflecting surfaces each at a different angle of inclination for splitting the light from said semi-transmitting area of said first means, said second means being adapted to move, upon movement of said first means to said second position, to a position whereat it does not reflect the light directed to the image forming plane.
Claim 2
Dependent Claim
207 words
A single lens reflex camera, comprising: a picture-taking optical system for forming an image of an object on an image forming plane; first means for directing the light transmitted through said picture-taking optical system to a view-finder optical system, said first means being movable between a first position for reflecting the light from said picture-taking optical system to said view-finder optical system and a second position for directing the light from said picture-taking optical system to the image forming plane, said first means having a semi-transmitting area formed in at least a portion thereof for passing therethrough at least a portion of the light from said picture-taking optical system; and second means for reflecting the light transmitted through said semi-transmitting area of said first means in a direction other than the direction towards the image forming plane when said first means is in said first position, said second means having a plurality of reflecting surfaces each at a different angle of inclination for splitting the light from said semi-transmitting area of said first means, said second means being adapted to move, upon movement of said first means to said second position, to a position whereat it does not reflect the light directed to the image forming plane.
Claim 3
Dependent Claim
39 words
A single lens reflex camera according to claim 1, wherein said reflecting surfaces of said second means include a semi-transmitting surface and a total-reflection surface, said total-reflection surface being arranged to reflect the light transmitted through said semi-transmitting surface.
Claim 4
Dependent Claim
50 words
A single lens reflex camera according to claim 2, further comprising plural photosensitive means for receiving the light split by said second means, one of said photosensitive means being adapted to provide focus information of the camera and another photosensitive means being adapted to provide exposure information of the camera.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |