JPS6424635A - Led lighting system - Google Patents

Led lighting system

Info

Publication number
JPS6424635A
JPS6424635A JP18144687A JP18144687A JPS6424635A JP S6424635 A JPS6424635 A JP S6424635A JP 18144687 A JP18144687 A JP 18144687A JP 18144687 A JP18144687 A JP 18144687A JP S6424635 A JPS6424635 A JP S6424635A
Authority
JP
Japan
Prior art keywords
leds
series
light emitting
short
circuit
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
JP18144687A
Other languages
Japanese (ja)
Inventor
Shoji Makino
Mizuhiro Hida
Hiroshi Oikawa
Takashi Saeki
Naohide Kushige
Shigenobu Minami
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.)
Toshiba Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Toshiba Corp
Nippon Telegraph and Telephone Corp
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 Toshiba Corp, Nippon Telegraph and Telephone Corp filed Critical Toshiba Corp
Priority to JP18144687A priority Critical patent/JPS6424635A/en
Publication of JPS6424635A publication Critical patent/JPS6424635A/en
Pending legal-status Critical Current

Links

Landscapes

  • Structure Of Receivers (AREA)

Abstract

PURPOSE:To reduce the power consumption by providing a short-circuit connecting plural light emitting elements in series mutually, connecting a constant current source circuit in series and using a switch elements so as to short- circuit selectively optional light emitting elements among the light emitting elements. CONSTITUTION:A power system consists of a lighting drive section A and a lighting control section B isolated and independent of each other. The lighting driving section A has two power sources composed of positive and negative power sources, and LEDs 51-5n connected in series with each other between power sources and a constant current source 6 are connected in series. Moreover, phototransistors 71a-7n-1a are connected respectively between each connecting point of the LEDs 51-5n and the negative power supply to constitute a short-circuit path of the LEDs. Thus, the driving current value is made constant independently of the number of driven LEDs 51-5n, thereby reducing the power consumption considerably.
JP18144687A 1987-07-21 1987-07-21 Led lighting system Pending JPS6424635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18144687A JPS6424635A (en) 1987-07-21 1987-07-21 Led lighting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18144687A JPS6424635A (en) 1987-07-21 1987-07-21 Led lighting system

Publications (1)

Publication Number Publication Date
JPS6424635A true JPS6424635A (en) 1989-01-26

Family

ID=16100912

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18144687A Pending JPS6424635A (en) 1987-07-21 1987-07-21 Led lighting system

Country Status (1)

Country Link
JP (1) JPS6424635A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019060945A (en) * 2017-09-25 2019-04-18 カシオ計算機株式会社 Electronic keyboard musical instrument, keyboard light emitting method and keyboard light emitting program

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019060945A (en) * 2017-09-25 2019-04-18 カシオ計算機株式会社 Electronic keyboard musical instrument, keyboard light emitting method and keyboard light emitting program

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