JPS5538535A - Focus detecting optical device - Google Patents
Focus detecting optical deviceInfo
- Publication number
- JPS5538535A JPS5538535A JP11150278A JP11150278A JPS5538535A JP S5538535 A JPS5538535 A JP S5538535A JP 11150278 A JP11150278 A JP 11150278A JP 11150278 A JP11150278 A JP 11150278A JP S5538535 A JPS5538535 A JP S5538535A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- optical axis
- focus
- photo detector
- zoom lens
- 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 make possible focus detection of good accuracy despite change in the condition of iris by directing part of the luminous flux incident to a zoom lens to the focus-detecting photo detector before the aperture diaphragm.
CONSTITUTION: The zoom lens consists of a focusing lens F which is movable in the optical axis direction, a variator lens V, a compensator lens C and a fixed prime lens P. A reflecting mirror M is disposed with a suitable inclination to the optical axis of the zoom lens symmetricaly with respect to one plane inclusive the optical axis of the zoom lens betweent the compensator lens C and a diaphragm aperture S, and a condenser lens L and a focus-detecting photo detector D are disposed on the straight line parallel to the optical axis of the luminous flux reflected by the reflecting mirror M and within the abovementioned plane. Since part of the luminous flux from the lens is led to the focus-detecting photo detector before the aperture diaphragm in this way, the quantity of light reaching the photo detector may be taken sufficiently similarly to that at the full aperture even in the dark state of the iris has been stopped down and the degradation in the accuracy in focus detection owing to degraded S/N is obviated.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11150278A JPS5538535A (en) | 1978-09-11 | 1978-09-11 | Focus detecting optical device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11150278A JPS5538535A (en) | 1978-09-11 | 1978-09-11 | Focus detecting optical device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5538535A true JPS5538535A (en) | 1980-03-18 |
Family
ID=14562915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11150278A Pending JPS5538535A (en) | 1978-09-11 | 1978-09-11 | Focus detecting optical device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5538535A (en) |
-
1978
- 1978-09-11 JP JP11150278A patent/JPS5538535A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5764217A (en) | Automatic focusing camera | |
US4370551A (en) | Focus detecting device | |
JPS5773709A (en) | Focusing-point detector | |
JPS5299820A (en) | Focusing glass | |
US4019191A (en) | Photometric device for use in a single lens reflex camera | |
US4716284A (en) | Photographic optical system having enhanced spectral transmittance characteristics | |
JPS5538535A (en) | Focus detecting optical device | |
US4005441A (en) | Photometric device of through the lens type exposure meter in a single-lens reflex camera | |
JPS55111928A (en) | Automatic focusing device | |
JPS5461522A (en) | Automatic focusing device | |
JPS5471652A (en) | Automatic dimmer for microscope light source | |
SE7612231L (en) | SEARCHER FOR MIRROR REFLECTOR CAMERA | |
SU1377811A1 (en) | Device for automatic focusing of a reflex camera | |
SU622034A1 (en) | Reflex camera | |
JPS556361A (en) | Focus measuring position assigning device in auto-focusing camera | |
JPS5546729A (en) | Finder optical system | |
JPS56109321A (en) | Single-lens reflex camera system providing ttl photometry | |
JPS6033377Y2 (en) | Light receiving device that can change the angle of incidence | |
JPS54107337A (en) | Focusing device of single-lens reflex camera | |
JPS55106429A (en) | Automatic focusing camera | |
JPS5749929A (en) | Photometric device of camera | |
JPS55106427A (en) | Single-lens reflex camera | |
JPS57148710A (en) | Focus detector | |
JPS56128923A (en) | Focus detector | |
JPS552232A (en) | Focusing optical device for camera |