JPH029182A - Light emitting element driving circuit - Google Patents

Light emitting element driving circuit

Info

Publication number
JPH029182A
JPH029182A JP15804488A JP15804488A JPH029182A JP H029182 A JPH029182 A JP H029182A JP 15804488 A JP15804488 A JP 15804488A JP 15804488 A JP15804488 A JP 15804488A JP H029182 A JPH029182 A JP H029182A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
light emitting
fluctuation
respect
current source
constant
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
JP15804488A
Other versions
JP2610307B2 (en )
Inventor
Kazuo Nogami
Fumihiko Shimizu
Masayuki Takami
Original Assignee
Toshiba 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

Links

Abstract

PURPOSE: To obtain high speed switching characteristics with respect to fluctuation in ambient temperature by a method wherein a current source of two pairs of transistors are constituted of compensation circuits with which the output of a light emitting device is almost constant with respect to fluctuation in temperature.
CONSTITUTION: A first driving current source K1 of a first pair of transistors Q1, Q2 consists of a transistor Q9 with an emitter resistor R9 connected and a base bias compensation circuit T9 connected to a base terminal. Bias voltage of the compensation circuit 9 changes in a positive direction with respect to fluctuation in ambient temperature and the circuit 9 compensates fluctuation in light emitting characteristics in a negative direction with respect to temperature of a light emitting device so that constant output can be obtained. On the other hand, a base bias compensation circuit T10 of a second driving current source K2 of a second pair of transistors A3, A4 is formed so that current ratio of the first current source K1 and the second one is almost constant.
COPYRIGHT: (C)1990,JPO&Japio
JP15804488A 1988-06-28 1988-06-28 Light-emitting element driving circuit Expired - Fee Related JP2610307B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15804488A JP2610307B2 (en) 1988-06-28 1988-06-28 Light-emitting element driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15804488A JP2610307B2 (en) 1988-06-28 1988-06-28 Light-emitting element driving circuit

Publications (2)

Publication Number Publication Date
JPH029182A true true JPH029182A (en) 1990-01-12
JP2610307B2 JP2610307B2 (en) 1997-05-14

Family

ID=15663065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15804488A Expired - Fee Related JP2610307B2 (en) 1988-06-28 1988-06-28 Light-emitting element driving circuit

Country Status (1)

Country Link
JP (1) JP2610307B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0548149A (en) * 1991-08-21 1993-02-26 Mitsubishi Electric Corp Semiconductor light emitting element driving circuit
WO2006009242A1 (en) * 2004-07-22 2006-01-26 Hamamatsu Photonics K.K. Led drive circuit
WO2007148582A1 (en) * 2006-06-21 2007-12-27 Mitsumi Electric Co., Ltd. Light emitting diode driving circuit
JP2008136526A (en) * 2006-11-30 2008-06-19 Soken Kk Curtain holder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0548149A (en) * 1991-08-21 1993-02-26 Mitsubishi Electric Corp Semiconductor light emitting element driving circuit
WO2006009242A1 (en) * 2004-07-22 2006-01-26 Hamamatsu Photonics K.K. Led drive circuit
US7812587B2 (en) 2004-07-22 2010-10-12 Hamamatsu Photonics K.K. LED drive circuit
WO2007148582A1 (en) * 2006-06-21 2007-12-27 Mitsumi Electric Co., Ltd. Light emitting diode driving circuit
JP2008004707A (en) * 2006-06-21 2008-01-10 Mitsumi Electric Co Ltd Light-emitting diode driving circuit
JP2008136526A (en) * 2006-11-30 2008-06-19 Soken Kk Curtain holder

Also Published As

Publication number Publication date Type
JP2610307B2 (en) 1997-05-14 grant

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees