JPS57155522A - Photometric device of camera - Google Patents
Photometric device of cameraInfo
- Publication number
- JPS57155522A JPS57155522A JP56041126A JP4112681A JPS57155522A JP S57155522 A JPS57155522 A JP S57155522A JP 56041126 A JP56041126 A JP 56041126A JP 4112681 A JP4112681 A JP 4112681A JP S57155522 A JPS57155522 A JP S57155522A
- Authority
- JP
- Japan
- Prior art keywords
- shutter curtain
- reflective member
- photodetecting element
- curtain surface
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
- G03B7/099—Arrangement of photoelectric elements in or on the camera
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Control For Cameras (AREA)
Abstract
PURPOSE:To measure diffused light efficiently by arranging a reflective member, directed to a shutter curtain surface, outside photographic luminous flux, and guiding the diffused light from the shutter curtain surface and a film surface to a photodetecting element. CONSTITUTION:Light incident to a shutter curtain surface and a film surface 5 through a photographic lens 3 is diffused by the shutter curtain surface, etc., and part of it reaches a reflective member 1 and is reflected there to enter a photodetecting element 2, measuring the brightness of an object. In a conventional photometric device, a photodetecting element 10 is arranged at the bottom part of a mirror box and an angle theta1 of incidence is approximately equal to 40 deg., but this device has an angle theta2 of incidence to the reflective member which is approximately equal to theta1/2. As the angle theta is greater and greater, the intensity of the diffused light is lower and lower, so the loss of the quantity of light decreases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56041126A JPS57155522A (en) | 1981-03-20 | 1981-03-20 | Photometric device of camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56041126A JPS57155522A (en) | 1981-03-20 | 1981-03-20 | Photometric device of camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57155522A true JPS57155522A (en) | 1982-09-25 |
Family
ID=12599749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56041126A Pending JPS57155522A (en) | 1981-03-20 | 1981-03-20 | Photometric device of camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57155522A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS612631U (en) * | 1984-06-12 | 1986-01-09 | ウエスト電気株式会社 | optical lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5093425A (en) * | 1973-12-19 | 1975-07-25 | ||
| JPS52104925A (en) * | 1976-02-27 | 1977-09-02 | Minolta Camera Co Ltd | Single lens reflex camera,s photometric optical system |
| US4172643A (en) * | 1976-02-04 | 1979-10-30 | Veb Pentacon Dresden Kamera Und Kinowerke | Exposure measuring apparatus for photographic cameras |
-
1981
- 1981-03-20 JP JP56041126A patent/JPS57155522A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5093425A (en) * | 1973-12-19 | 1975-07-25 | ||
| US4172643A (en) * | 1976-02-04 | 1979-10-30 | Veb Pentacon Dresden Kamera Und Kinowerke | Exposure measuring apparatus for photographic cameras |
| JPS52104925A (en) * | 1976-02-27 | 1977-09-02 | Minolta Camera Co Ltd | Single lens reflex camera,s photometric optical system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS612631U (en) * | 1984-06-12 | 1986-01-09 | ウエスト電気株式会社 | optical lens |
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