JPS5579425A - Light emitting device - Google Patents
Light emitting deviceInfo
- Publication number
- JPS5579425A JPS5579425A JP15403978A JP15403978A JPS5579425A JP S5579425 A JPS5579425 A JP S5579425A JP 15403978 A JP15403978 A JP 15403978A JP 15403978 A JP15403978 A JP 15403978A JP S5579425 A JPS5579425 A JP S5579425A
- Authority
- JP
- Japan
- Prior art keywords
- photography
- infrared ray
- light emitting
- viewing field
- photo detector
- 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
- Liquid Crystal (AREA)
Abstract
PURPOSE: To prevent photographing of undesired object located at close range in an extreme brightness, by restraining the light radiated to such object.
CONSTITUTION: While pressing the shutter button, a signal is fed to a terminal 13 to operate a pulse generator 14, and a pulse form infrared ray is emitted to the entire viewing field of photography from an infrared ray emitter 10. As a result, the lights reflected from each peripheral part of the viewing field of photography are received by photo detectors 6W9. The photo detectors 6W9 are disposed around the light emitting part 1, directed to each peripheral part of the viewing field of photography, and have sharp directivity. When the reflected light form an object at close range reaches a down-directed photo detector 8 within a specified time, the detection output of each photo detector is compared with the emission infrared ray pulse in each detection circuit 15W18, but the detection output is produced only in the detection circuit 17 connected to the photo detector 8. As a result, only a liquid crystal control circuit 21 is operated, and only a dimmer filter 4 in the front lower end part of the light emitting part 1 is changed to dimmer state.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15403978A JPS5579425A (en) | 1978-12-12 | 1978-12-12 | Light emitting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15403978A JPS5579425A (en) | 1978-12-12 | 1978-12-12 | Light emitting device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5579425A true JPS5579425A (en) | 1980-06-14 |
JPS6119021B2 JPS6119021B2 (en) | 1986-05-15 |
Family
ID=15575571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15403978A Granted JPS5579425A (en) | 1978-12-12 | 1978-12-12 | Light emitting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5579425A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5347339A (en) * | 1992-04-17 | 1994-09-13 | Olympus Optical Co., Ltd. | Strobe apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62151352U (en) * | 1986-03-17 | 1987-09-25 |
-
1978
- 1978-12-12 JP JP15403978A patent/JPS5579425A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5347339A (en) * | 1992-04-17 | 1994-09-13 | Olympus Optical Co., Ltd. | Strobe apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS6119021B2 (en) | 1986-05-15 |
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