JPS5748875A - Light source controller - Google Patents

Light source controller

Info

Publication number
JPS5748875A
JPS5748875A JP55123761A JP12376180A JPS5748875A JP S5748875 A JPS5748875 A JP S5748875A JP 55123761 A JP55123761 A JP 55123761A JP 12376180 A JP12376180 A JP 12376180A JP S5748875 A JPS5748875 A JP S5748875A
Authority
JP
Japan
Prior art keywords
power supply
light source
conductive
cut
trs
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.)
Granted
Application number
JP55123761A
Other languages
Japanese (ja)
Other versions
JPS6322510B2 (en
Inventor
Tetsuo Kuchiki
Namio Yamaguchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP55123761A priority Critical patent/JPS5748875A/en
Publication of JPS5748875A publication Critical patent/JPS5748875A/en
Publication of JPS6322510B2 publication Critical patent/JPS6322510B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Audible And Visible Signals (AREA)

Abstract

PURPOSE:To exercise control efficiently over a light source, by illuminating a specified light source among a plurality of light sources at the application of power supply and distinguishing them without momentary illumination of unnecessary light sources when the power supply is disconnected. CONSTITUTION:When a power supply is applied after a prescribed time, a transistor (TR)27 is cut off and a TR29 is conductive, resulting that TRs 22-25 are cut off and a TR9 is conductive and an LED 2a illuminates. With this state, when a switch 60b is depressed, the output state of FFs 21b, 21c is changed and the output at terminals (a), (b), (c), (d) is (0010). As a result, the TR9 cuts off, the TR6 is conductive and the LED 2b illuminates. Similarly, when switches 60c, 60d are depressed, LEDs 2c, 2d are illluminated. When the power supply is disconnected, since the TRs 22-25 are cut off at a prescribed time, the LEDs 2a, 2b, 2c, 2d are distinguished without momentary illumination.
JP55123761A 1980-09-05 1980-09-05 Light source controller Granted JPS5748875A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55123761A JPS5748875A (en) 1980-09-05 1980-09-05 Light source controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55123761A JPS5748875A (en) 1980-09-05 1980-09-05 Light source controller

Publications (2)

Publication Number Publication Date
JPS5748875A true JPS5748875A (en) 1982-03-20
JPS6322510B2 JPS6322510B2 (en) 1988-05-12

Family

ID=14868623

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55123761A Granted JPS5748875A (en) 1980-09-05 1980-09-05 Light source controller

Country Status (1)

Country Link
JP (1) JPS5748875A (en)

Also Published As

Publication number Publication date
JPS6322510B2 (en) 1988-05-12

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