JPS55111925A - Focusing point signal generator - Google Patents
Focusing point signal generatorInfo
- Publication number
- JPS55111925A JPS55111925A JP1892079A JP1892079A JPS55111925A JP S55111925 A JPS55111925 A JP S55111925A JP 1892079 A JP1892079 A JP 1892079A JP 1892079 A JP1892079 A JP 1892079A JP S55111925 A JPS55111925 A JP S55111925A
- Authority
- JP
- Japan
- Prior art keywords
- focusing
- signal
- distance
- point signal
- focusing point
- 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 stably create the focusing point signal in the automatic fucusing device by performing the generation and OFF of the focusing point signal at the specified time.
CONSTITUTION: Front and rear focuses are displayed in lamps 8, 10 through AND gates 5, 6 according to the front and rear focus decision signals from the comparison part of a module for automatic focus detection inputted from terminal 7. When the photographing lens is moved by turning its distance ring, the decision signal inputted to the terminal 7 inverts in the focusing position, causing an FF 4 to be set by way of an inverter 9, differentiation circuits 12, 11 and OR circuit 13 then the gates 6, 5 become forbidden state, to go off the lamps 8, 10. At the same time, the focusing display lamp 14 to which the set output of the FF 14 is applied as the focusing signal lights up. Thence, the FF4 is reset by way of the differentiation circuit 16 by the turning angle signal of the distance ring applied at the time when the photographing distance by the photographing lens moving together with the distance ring deviates from the preset allowable distance range. The focusing signal then goes ON, thus the focusing signal is stably created.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1892079A JPS5933881B2 (en) | 1979-02-20 | 1979-02-20 | Focus signal generator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1892079A JPS5933881B2 (en) | 1979-02-20 | 1979-02-20 | Focus signal generator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55111925A true JPS55111925A (en) | 1980-08-29 |
JPS5933881B2 JPS5933881B2 (en) | 1984-08-18 |
Family
ID=11985040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1892079A Expired JPS5933881B2 (en) | 1979-02-20 | 1979-02-20 | Focus signal generator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5933881B2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5772115A (en) * | 1980-10-23 | 1982-05-06 | Canon Inc | Output stablizing circuit for focus detector |
JPS57157224A (en) * | 1981-03-23 | 1982-09-28 | Olympus Optical Co Ltd | Display device for focusing of camera |
JPS57208520A (en) * | 1981-06-19 | 1982-12-21 | Hitachi Ltd | Automatic focusing device |
JPS58126440U (en) * | 1982-02-22 | 1983-08-27 | 旭光学工業株式会社 | Camera viewfinder display device |
JPS593406A (en) * | 1982-06-29 | 1984-01-10 | Olympus Optical Co Ltd | Detector for focusing state |
US4561746A (en) * | 1983-06-15 | 1985-12-31 | Minolta Camera Kabushiki Kaisha | Focus detection device and automatic focusing device for camera |
-
1979
- 1979-02-20 JP JP1892079A patent/JPS5933881B2/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5772115A (en) * | 1980-10-23 | 1982-05-06 | Canon Inc | Output stablizing circuit for focus detector |
JPS57157224A (en) * | 1981-03-23 | 1982-09-28 | Olympus Optical Co Ltd | Display device for focusing of camera |
JPH0147763B2 (en) * | 1981-03-23 | 1989-10-16 | Olympus Optical Co | |
JPS57208520A (en) * | 1981-06-19 | 1982-12-21 | Hitachi Ltd | Automatic focusing device |
JPH0230486B2 (en) * | 1981-06-19 | 1990-07-06 | Hitachi Ltd | |
JPS58126440U (en) * | 1982-02-22 | 1983-08-27 | 旭光学工業株式会社 | Camera viewfinder display device |
JPH0452737Y2 (en) * | 1982-02-22 | 1992-12-11 | ||
JPS593406A (en) * | 1982-06-29 | 1984-01-10 | Olympus Optical Co Ltd | Detector for focusing state |
JPH0254523B2 (en) * | 1982-06-29 | 1990-11-21 | Olympus Optical Co | |
US4561746A (en) * | 1983-06-15 | 1985-12-31 | Minolta Camera Kabushiki Kaisha | Focus detection device and automatic focusing device for camera |
Also Published As
Publication number | Publication date |
---|---|
JPS5933881B2 (en) | 1984-08-18 |
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