JPS5552030A - Focusing optical device for single-lens reflex camera - Google Patents
Focusing optical device for single-lens reflex cameraInfo
- Publication number
- JPS5552030A JPS5552030A JP12450278A JP12450278A JPS5552030A JP S5552030 A JPS5552030 A JP S5552030A JP 12450278 A JP12450278 A JP 12450278A JP 12450278 A JP12450278 A JP 12450278A JP S5552030 A JPS5552030 A JP S5552030A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- torus
- photo detector
- photographing lens
- cooperation
- 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
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
Abstract
PURPOSE: To enable the setting position of a distance measuring photo detector to be selected as desired by the constitution comprising providing a torus-form lens moving in cooperation with the movement of the photographing lens to the outside circumference of the photographing lens and leading the light converged by this to the distance measuring photo detector.
CONSTITUTION: A photographing lens 1 and a torus-form lens 2 are provided to one lens-barrel and the torus-form lens 2 also moves in the optical axis direction in cooperation with the movement in the optical axis direction of the lens 1. On the other hand, a distance-measuring photo detector 4 which receives the light converted by the torus-form lens 2 is provided on the optical axis to a quick return mirror 3 and the light converged by the torus-form lens 2 moving in cooperation to the movement of the photographing lens 1 is imaged on the photo detector 4. The position where the contrast thereof becomes maximum is detected as the focus position of the photographing lens 1.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12450278A JPS5552030A (en) | 1978-10-09 | 1978-10-09 | Focusing optical device for single-lens reflex camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12450278A JPS5552030A (en) | 1978-10-09 | 1978-10-09 | Focusing optical device for single-lens reflex camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5552030A true JPS5552030A (en) | 1980-04-16 |
Family
ID=14887071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12450278A Pending JPS5552030A (en) | 1978-10-09 | 1978-10-09 | Focusing optical device for single-lens reflex camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5552030A (en) |
-
1978
- 1978-10-09 JP JP12450278A patent/JPS5552030A/en active Pending
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