JPS56164335A - Illumination device - Google Patents

Illumination device

Info

Publication number
JPS56164335A
JPS56164335A JP6754380A JP6754380A JPS56164335A JP S56164335 A JPS56164335 A JP S56164335A JP 6754380 A JP6754380 A JP 6754380A JP 6754380 A JP6754380 A JP 6754380A JP S56164335 A JPS56164335 A JP S56164335A
Authority
JP
Japan
Prior art keywords
increased
light
trigger
lamp
potential
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
JP6754380A
Other languages
Japanese (ja)
Inventor
Takeshi Nagasawa
Shunzo Inoue
Hitoshi Yanagawa
Toshio Iwatani
Michio Kasuya
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP6754380A priority Critical patent/JPS56164335A/en
Publication of JPS56164335A publication Critical patent/JPS56164335A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

PURPOSE:To prevent unnecessary generation of heat and to increase durability of the machine by controlling variably an illumination quantity of light from a dark condition to a clear condition that has been set by a detection signal before an object enters a photographing part in a rotary microcamera. CONSTITUTION:When an object exists in a detection part, LED-P11 of a photocoupler P1 emits light and a photo-SCRP12 conducts. Consequently, base potential of a transistor (TR) Q1 is lowered compared with the case without the object, potential of (a) point of a resistor R9 is decreased also, and a collector current of a Q2 is increased, a charging current of a capacitor C2 for trigger is increased to quicken charging time of the C2 and a cycle of a blocking oscillation of a Q3 is shortened to hasten a trigger of a Triac T by a pulse transformer PT. Therefore, electric power to be applied to a lamp 6 is increased and a quantity of light of the lamp becomes to obtain brightness set by a variable resistor VR1.
JP6754380A 1980-05-21 1980-05-21 Illumination device Pending JPS56164335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6754380A JPS56164335A (en) 1980-05-21 1980-05-21 Illumination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6754380A JPS56164335A (en) 1980-05-21 1980-05-21 Illumination device

Publications (1)

Publication Number Publication Date
JPS56164335A true JPS56164335A (en) 1981-12-17

Family

ID=13347980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6754380A Pending JPS56164335A (en) 1980-05-21 1980-05-21 Illumination device

Country Status (1)

Country Link
JP (1) JPS56164335A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108966422A (en) * 2018-08-09 2018-12-07 闽南师范大学 A kind of light-dimming method and circuit of LED light

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108966422A (en) * 2018-08-09 2018-12-07 闽南师范大学 A kind of light-dimming method and circuit of LED light

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