JPS56107226A - Battery checker of data back of camera - Google Patents

Battery checker of data back of camera

Info

Publication number
JPS56107226A
JPS56107226A JP1070180A JP1070180A JPS56107226A JP S56107226 A JPS56107226 A JP S56107226A JP 1070180 A JP1070180 A JP 1070180A JP 1070180 A JP1070180 A JP 1070180A JP S56107226 A JPS56107226 A JP S56107226A
Authority
JP
Japan
Prior art keywords
scr13
led4
battery
control circuit
turns
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
JP1070180A
Other languages
Japanese (ja)
Inventor
Yasunori Kitamura
Mikio Takemae
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.)
Nikon Corp
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co Ltd
Nippon Kogaku KK
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 Nippon Chemical Industrial Co Ltd, Nippon Kogaku KK filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP1070180A priority Critical patent/JPS56107226A/en
Publication of JPS56107226A publication Critical patent/JPS56107226A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/26—Power supplies; Circuitry or arrangement to switch on the power source; Circuitry to check the power source voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)

Abstract

PURPOSE:To enable a small number of elements to confirm data recording and to make a battery check, by using a forward voltage drop across LED as a reference voltage for the battery check. CONSTITUTION:As switch 14 is closed through release operation, control circuit 15 sends a data recording signal to light display device 17 for a constant time and at the same time, a recording confirmation signal turns on transistor T6 via resistance 2 to turn on LED4. At this time, the potential at point (a) is equivalent to a forward voltage drop across LED4. When the potential difference between points (a) and (b) exceeds voltage VBE of T8, SCR13 is triggered to stop the operation of control circuit 15, so that the external display will disappear. Then, SCR13 turns on to store the information that the battery voltage is less than a prescribed value and the following data can not be recorded.
JP1070180A 1980-01-31 1980-01-31 Battery checker of data back of camera Pending JPS56107226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1070180A JPS56107226A (en) 1980-01-31 1980-01-31 Battery checker of data back of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1070180A JPS56107226A (en) 1980-01-31 1980-01-31 Battery checker of data back of camera

Publications (1)

Publication Number Publication Date
JPS56107226A true JPS56107226A (en) 1981-08-26

Family

ID=11757588

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1070180A Pending JPS56107226A (en) 1980-01-31 1980-01-31 Battery checker of data back of camera

Country Status (1)

Country Link
JP (1) JPS56107226A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6014279A (en) * 1989-08-31 2000-01-11 Canon Kabushiki Kaisha Erasing device having a plurality of erasing modes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6014279A (en) * 1989-08-31 2000-01-11 Canon Kabushiki Kaisha Erasing device having a plurality of erasing modes

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