JPS5517118A - Dimmer device of automatic dimmer operation electronic flash device - Google Patents
Dimmer device of automatic dimmer operation electronic flash deviceInfo
- Publication number
- JPS5517118A JPS5517118A JP8908278A JP8908278A JPS5517118A JP S5517118 A JPS5517118 A JP S5517118A JP 8908278 A JP8908278 A JP 8908278A JP 8908278 A JP8908278 A JP 8908278A JP S5517118 A JPS5517118 A JP S5517118A
- Authority
- JP
- Japan
- Prior art keywords
- dimmer
- flash discharge
- turned
- light
- power source
- 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
- Stroboscope Apparatuses (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
PURPOSE:To perform accurate dimmer operation excelling in stability and sensitivity, by supplying power source simultaneously with power supply to DC-DC converter circuit, and operating to force the flash discharge deivce to emit light. CONSTITUTION:When a power switch 2 of DC-DC converter circuit is turned on, a switch 10 is also turned on in cooperation, so that a power source 11 may be supplied. However, since a transistor 17 is in conducting state, the potential of an integrating capacitor 16 is regarded to be about zero. Afterwards, when an electric charge is accumulated in a main discharge capacitor 4 and a flash discharge tube 6 is caused to emit light by the operation of a trigger circuit 5, a photo detector 15 receives the light reflected from the subject, and charging of the integrating capacitor 16 is started in proportion to the quantity of light thus received. When this charged voltage reaches a specified voltage, the emission of the flash discharge tube 6 is stopped, thus returning to the state before operation. Thus, dimmer operation of high stability, excellent sensitivity, and high accuracy may be achieved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8908278A JPS5517118A (en) | 1978-07-20 | 1978-07-20 | Dimmer device of automatic dimmer operation electronic flash device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8908278A JPS5517118A (en) | 1978-07-20 | 1978-07-20 | Dimmer device of automatic dimmer operation electronic flash device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5517118A true JPS5517118A (en) | 1980-02-06 |
Family
ID=13960930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8908278A Pending JPS5517118A (en) | 1978-07-20 | 1978-07-20 | Dimmer device of automatic dimmer operation electronic flash device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5517118A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3517255A (en) * | 1968-07-25 | 1970-06-23 | Honeywell Inc | Flash apparatus with automatic light termination using light activated silicon controlled rectifier |
JPS484896U (en) * | 1971-05-31 | 1973-01-20 | ||
JPS5215224U (en) * | 1975-07-21 | 1977-02-03 |
-
1978
- 1978-07-20 JP JP8908278A patent/JPS5517118A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3517255A (en) * | 1968-07-25 | 1970-06-23 | Honeywell Inc | Flash apparatus with automatic light termination using light activated silicon controlled rectifier |
JPS484896U (en) * | 1971-05-31 | 1973-01-20 | ||
JPS5215224U (en) * | 1975-07-21 | 1977-02-03 |
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