Claims
- 1. An electronic flash control device for controlling an electronic flash used with a camera, said control device comprising:
- means for applying a trigger signal to said electronic flash to allow said electronic flash to emit light;
- means for applying an enable signal at a predetermined time which occurs after a noise related to said trigger signal is produced.Iadd., said enable signal applying means initiating a counting of a time in response to said trigger signal, independent of a light emitting operation of said electronic flash, said enable signal being applied at said predetermined time.Iaddend.;
- first means for generating a quench signal when a quantity of light from an object to be photographed reaches a predetermined value; and
- second means for generating a final quench signal when both said enable signal and said quench signal are received.
- 2. An electronic flash control device as claimed in claim 1, wherein said predetermined time occurs at approximately a first instant of said emission of light.
- 3. An electronic flash control device as claimed in claim 1, wherein said predetermined time occurs a predetermined time period after said trigger signal has been generated.
- 4. An electronic flash control device as claimed in claim 2, wherein said predetermined time occurs a predetermined time period after said trigger signal has been generated.
- 5. An electronic flash control device as claimed in claim 3, wherein data used to determine said predetermined time period is stored in a memory located in said camera.
- 6. An electronic flash control device as claimed in claim 5, wherein said memory is an electrically erasable/programmable memory.
- 7. An electronic flash control device as claimed in claim 4, wherein data used to determine said predetermined time period is stored in a memory located in said camera.
- 8. An electronic flash control device as claimed in claim 7, wherein said memory is an electrically erasable/programmable memory.
- 9. An electronic flash control device as claimed in claim 1, wherein said camera is a TTL light control type camera.
- 10. An electronic flash control device as claimed in claim 1, wherein said camera is a silver salt photographic camera.
- 11. An electronic flash control device as claimed in claim 1, wherein said camera is an electronic still camera.
- 12. An electronic flash control device as claimed in claim 1, wherein said electronic flash is built in said camera.
- 13. An electronic flash control device as claimed in claim 1, wherein said electronic flash is an electronic flash which is not built in said camera.
- 14. An electronic flash control device as claimed in claim 1, wherein said enable signal allows said quench signal to be output.
- 15. An electronic flash control device as claimed in claim 1, wherein said enable signal allows said final quench signal to be output.
- 16. An electronic flash control device as claimed in claim 1, wherein said first means comprises:
- integrating means for integrating light from said object to be photographed so as to produce a signal corresponding to said quantity of light;
- comparator means operatively coupled to said integrating means for comparing said signal corresponding to said quantity of light with said predetermined value; and wherein said second means comprises:
- logical means operatively coupled to said comparator means and receiving said enable signal.
- 17. An . .electric.!. flash control device for controlling an electronic flash used with a camera.Iadd., .Iaddend.comprising:
- means for applying a trigger signal to said electronic flash to emit light;
- means for applying an enable signal at a predetermined time which occurs after a noise related to said trigger signal is produced.Iadd., said enable signal applying means initiating a count of a time in response to said trigger signal, independent of a light emitting operation of said electronic flash, said enable signal being applied at said predetermined time; .Iaddend.
- means for integrating a quantity of light from an object to be photographed;
- means for generating a quench signal when said quantity of light reaches a predetermined value; and
- second means for generating a final quench signal when both said enable signal and said quench signal have been generated,
- said integrating means and said quench signal generating means being activated at the same time in response to said trigger signal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-43118 |
Mar 1988 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 07/327,674 filed Mar. 23, 1989 abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0275089 |
Jul 1989 |
EPX |
52-94021 |
Aug 1977 |
JPX |
54-70825 |
Jun 1979 |
JPX |
58-62633 |
Apr 1983 |
JPX |
60-118897 |
Aug 1985 |
JPX |
63-6791 |
Jan 1988 |
JPX |
Non-Patent Literature Citations (1)
Entry |
English Language abstract of Japanese Patent Application No. 58-62633. |
Continuations (1)
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Number |
Date |
Country |
Parent |
327674 |
Mar 1989 |
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Reissues (1)
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Number |
Date |
Country |
Parent |
712998 |
Jun 1991 |
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