JPS55126221A - Focus detecting optical device - Google Patents
Focus detecting optical deviceInfo
- Publication number
- JPS55126221A JPS55126221A JP3358679A JP3358679A JPS55126221A JP S55126221 A JPS55126221 A JP S55126221A JP 3358679 A JP3358679 A JP 3358679A JP 3358679 A JP3358679 A JP 3358679A JP S55126221 A JPS55126221 A JP S55126221A
- Authority
- JP
- Japan
- Prior art keywords
- photo detecting
- luminous fluxes
- vignetted
- objective lens
- detecting surfaces
- 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.)
- Granted
Links
Landscapes
- Focusing (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To eliminate the adverse influence of vignetting occuring in the size of the pupil diameter of an objective lens and enable accurate detection to be performed by inserting shield plates from the outside circumferential side of reimaging lenses toward the optical axis of the objective lens.
CONSTITUTION: When shield plates 5, 5' are inserted from the outside circumferential side of reimaging lenses 3, 3 toward the optical axis of an objective lens 1, part of the luminous fluxes going to 4a, 4c are vignetted by the shield plate 5 on the photo detecting surfaces 4a, 4c of a photoelectric element 4 and the opening angles of a1', a2' a3 and c1', c2, c3 respectively decrease. Simultaneous the luminous fluxes entering the photo detecting surfaces 4'b, 4'c of the photoelectric element 4' are also vignetted. Hence, if the protruding amounts of the shield plates 5, 5' into the photo detecting optical path are so determined that the luminous fluexes vignetted by the shield plates 5, 5', out of the luminous fluxes entering the photo detecting surfaces 4a, 4c, 4'b, 4'c coincide nearly with the luminous fluxes that the luminous fluxes going to the photo detecting surfaces 4b, 4a' are vignetted by the objective lens 1, then the illuminances on the respective photo detecting surfaces of the photoelectric elements 4, 4' become even and the focus detection may be accomplished accurately.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3358679A JPS55126221A (en) | 1979-03-22 | 1979-03-22 | Focus detecting optical device |
US06/131,494 US4322616A (en) | 1979-03-22 | 1980-03-18 | Focus detecting device with shielding |
DE19803011064 DE3011064A1 (en) | 1979-03-22 | 1980-03-21 | DEFINITION DETECTING DEVICE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3358679A JPS55126221A (en) | 1979-03-22 | 1979-03-22 | Focus detecting optical device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55126221A true JPS55126221A (en) | 1980-09-29 |
JPS6154201B2 JPS6154201B2 (en) | 1986-11-21 |
Family
ID=12390612
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3358679A Granted JPS55126221A (en) | 1979-03-22 | 1979-03-22 | Focus detecting optical device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55126221A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781110A (en) * | 1971-11-15 | 1973-12-25 | Leitz Ernst Gmbh | Optical range finding system |
JPS5267322A (en) * | 1975-12-02 | 1977-06-03 | Masayoshi Yoshimura | Focusing device |
JPS5295221A (en) * | 1976-02-04 | 1977-08-10 | Minolta Camera Co Ltd | Detector for focusing |
US4047022A (en) * | 1976-01-13 | 1977-09-06 | Ernst Leitz Gmbh | Auto focus with spatial filtering and pairwise interrogation of photoelectric diodes |
DE2634655A1 (en) * | 1976-08-02 | 1978-02-09 | Leitz Ernst Gmbh | Automatic focuser for reflex camera - has partially reflective reflex mirror and completely reflective auxiliary mirror directing light via beam splitter to two receivers |
-
1979
- 1979-03-22 JP JP3358679A patent/JPS55126221A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3781110A (en) * | 1971-11-15 | 1973-12-25 | Leitz Ernst Gmbh | Optical range finding system |
JPS5267322A (en) * | 1975-12-02 | 1977-06-03 | Masayoshi Yoshimura | Focusing device |
US4047022A (en) * | 1976-01-13 | 1977-09-06 | Ernst Leitz Gmbh | Auto focus with spatial filtering and pairwise interrogation of photoelectric diodes |
JPS5295221A (en) * | 1976-02-04 | 1977-08-10 | Minolta Camera Co Ltd | Detector for focusing |
DE2634655A1 (en) * | 1976-08-02 | 1978-02-09 | Leitz Ernst Gmbh | Automatic focuser for reflex camera - has partially reflective reflex mirror and completely reflective auxiliary mirror directing light via beam splitter to two receivers |
Also Published As
Publication number | Publication date |
---|---|
JPS6154201B2 (en) | 1986-11-21 |
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