JPS554056A - Focusing optical device for single-lens reflex camera - Google Patents
Focusing optical device for single-lens reflex cameraInfo
- Publication number
- JPS554056A JPS554056A JP7693878A JP7693878A JPS554056A JP S554056 A JPS554056 A JP S554056A JP 7693878 A JP7693878 A JP 7693878A JP 7693878 A JP7693878 A JP 7693878A JP S554056 A JPS554056 A JP S554056A
- Authority
- JP
- Japan
- Prior art keywords
- detecting element
- quick return
- return mirror
- focus detecting
- photographic
- 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
Landscapes
- Camera Bodies And Camera Details Or Accessories (AREA)
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To make production and construction simple and eliminate the need for increased sizes of cameras by providing a focus detecting element forming a part of the image of the subject between the photographic lens and quick return mirror and deviating the same from photographic luminous flux in cooperation to shutter release operation.
CONSTITUTION: An arm 24 is mounted to the turning axis 23 of the quick return mirror 22 positioned between a photographic lens 20 and shutter 21 on the outer side thereof by way of a spring means. A focus detecting element 25 is mounted to this arm 24 in the state before shutter release so as to position on the optical axis between the photographic lens 20 and quick return mirror 22. The focus detecting element 25 is constituted by mounting an auxiliary lens 27 to the front of a photo detecting element 25 and is formed on the film plane 28 by the photographic lens 20. Light is received to a part of the same image as the image of the subject. When the release button is pushed, the quick return mirror 22 turns and in cooperation to this the arm 24 and focus detecting element 25 also turn and approach to stoppers 29b, 30b respectively and stop by being respectively detained by these stoppers in the position of not vignetting the photographic luminous flux to the film plane 28.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7693878A JPS554056A (en) | 1978-06-27 | 1978-06-27 | Focusing optical device for single-lens reflex camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7693878A JPS554056A (en) | 1978-06-27 | 1978-06-27 | Focusing optical device for single-lens reflex camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS554056A true JPS554056A (en) | 1980-01-12 |
Family
ID=13619669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7693878A Pending JPS554056A (en) | 1978-06-27 | 1978-06-27 | Focusing optical device for single-lens reflex camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS554056A (en) |
-
1978
- 1978-06-27 JP JP7693878A patent/JPS554056A/en active Pending
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