JPS5552031A - Focusing detector for single-lens reflex camera - Google Patents
Focusing detector for single-lens reflex cameraInfo
- Publication number
- JPS5552031A JPS5552031A JP12483078A JP12483078A JPS5552031A JP S5552031 A JPS5552031 A JP S5552031A JP 12483078 A JP12483078 A JP 12483078A JP 12483078 A JP12483078 A JP 12483078A JP S5552031 A JPS5552031 A JP S5552031A
- Authority
- JP
- Japan
- Prior art keywords
- distance
- mirror
- measuring
- luminous flux
- 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
Abstract
PURPOSE: To enable stable focusing detection to be performed without increasing the size of the camera body by forming a reflecting mirror surface to a quick return mirror, leading part of the photographing luminous flux to the inside of the quick return mirror and using the same as a distance-measuring luminous flux.
CONSTITUTION: A light transmission portion 7 constituted by a half mirror is formed in the central part of a quick return mirror 2 and the light transmitted through here is passed as a distance-measuring luminous flux through the inside of the mirror 2 and is then led to a distance-measuring photo detector 10 via reflecting mirror 9. The positions of the film plane 6 and distance-measuring photo detector 10 are made equivalent with respect to the photographing lens 1 to eliminate mutual optical path differences and a light absorbing body 11 is provided to the mirror 2 to so constitute the device that only the direct transmission light having no reflected light enters the distance-measuring photo detector 10 as a distance- measuring luminous flux. Thus, the focusing detection may be performed without noise and at high accuracy.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12483078A JPS5552031A (en) | 1978-10-11 | 1978-10-11 | Focusing detector for single-lens reflex camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12483078A JPS5552031A (en) | 1978-10-11 | 1978-10-11 | Focusing detector for single-lens reflex camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5552031A true JPS5552031A (en) | 1980-04-16 |
Family
ID=14895144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12483078A Pending JPS5552031A (en) | 1978-10-11 | 1978-10-11 | Focusing detector for single-lens reflex camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5552031A (en) |
-
1978
- 1978-10-11 JP JP12483078A patent/JPS5552031A/en active Pending
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