JPS5468236A - Shutter speed control circuit for industrial exposure device - Google Patents

Shutter speed control circuit for industrial exposure device

Info

Publication number
JPS5468236A
JPS5468236A JP13466277A JP13466277A JPS5468236A JP S5468236 A JPS5468236 A JP S5468236A JP 13466277 A JP13466277 A JP 13466277A JP 13466277 A JP13466277 A JP 13466277A JP S5468236 A JPS5468236 A JP S5468236A
Authority
JP
Japan
Prior art keywords
signal
circuit
shutter
exposure
illumination intensity
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
Application number
JP13466277A
Other languages
Japanese (ja)
Inventor
Tetsuzo Tanimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13466277A priority Critical patent/JPS5468236A/en
Publication of JPS5468236A publication Critical patent/JPS5468236A/en
Pending legal-status Critical Current

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  • Control Of Exposure In Printing And Copying (AREA)

Abstract

PURPOSE: To automatically control the exposure time relative to the fluctuation of illumination intensity of the light source by constituting a shutter such that it is opened till the illumination intensity of exposure detected by photodiode coincides with the counted value of pulses from the oscillation circuit.
CONSTITUTION: Shutter is opened by shutter open signal 10. Light 21 is detected by photo-diode D1 highly sensitive to the wave length of the light source. Detected signal 11 is so small that it is amplified 5. Amplified signal 12 is inputted to divider 6. Meanwhile the signal 17 which informs that the shutter has ended to open is A/D converted 7, and the output 13 of the divider 6 is converted to digital signal 14. The signal 14 is memorized in circuit 8 as the illumination intensity data of exposure by the conversion and signal 15 form circuit 7. Signal 15 triggers oscillation circuit 2 at the same time, outputs pulse string 18, and it is counted by circuit 3. Counted value 19 is compared 4 with the illumination intensity data 16 of the circuit 8. The comparation circuit 4 delivers coincidence signal at the time point where the value 19 coincides with the data 16, and at the same time when the oscillation circuit 2 is prohibited the shutter is closed to and the exposure.
COPYRIGHT: (C)1979,JPO&Japio
JP13466277A 1977-11-11 1977-11-11 Shutter speed control circuit for industrial exposure device Pending JPS5468236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13466277A JPS5468236A (en) 1977-11-11 1977-11-11 Shutter speed control circuit for industrial exposure device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13466277A JPS5468236A (en) 1977-11-11 1977-11-11 Shutter speed control circuit for industrial exposure device

Publications (1)

Publication Number Publication Date
JPS5468236A true JPS5468236A (en) 1979-06-01

Family

ID=15133614

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13466277A Pending JPS5468236A (en) 1977-11-11 1977-11-11 Shutter speed control circuit for industrial exposure device

Country Status (1)

Country Link
JP (1) JPS5468236A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831941A (en) * 1971-08-27 1973-04-26
JPS5087640A (en) * 1973-12-06 1975-07-14

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4831941A (en) * 1971-08-27 1973-04-26
JPS5087640A (en) * 1973-12-06 1975-07-14

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