Light emitting device drive circuit

Details Light emitting device drive circuit Light emitting device drive circuit

2007-02-20

2007-02-20

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular beam control device

Having particular beam control circuit component

C372S029015

Reexamination Certificate

active

10645627

ABSTRACT:
The present invention provides a light emitting device drive circuit which does not require complicated feedback control for shortening a rising response delay time in the transition from an extinction state of a light emitting device to a light emitting state so as not to increase a bias current, and for eliminating harmful effects due to the influence of a droop phenomenon. A circuit including a series of a coil55and a resistor54is connected in parallel with an LD53. In this configuration, the LD53is subjected to supply of an overshoot drive current ILD for a time period determined by a time constant of the coil55and the resistor54, i.e., a time period in which a high-frequency current is supplied in the transition from the extinction state to the light emitting state. Thus, a delay in rise time until light emission of the LD53can be decreased. The drive current ILD supplied to the LD53is increased in proportion to a decrease of a forward voltage Vopsupplied to the LD53due to temperature rise. Thus, even if the light emitting state continues for a long period of time, the intensity of light emission from the LD53can be kept constant.

REFERENCES:
patent: 4243951 (1981-01-01), Wolkstein et al.
patent: 5907569 (1999-05-01), Glance et al.
patent: 6049175 (2000-04-01), Forsberg
patent: 6388689 (2002-05-01), Toda et al.
patent: 52-144289 (1977-12-01), None
patent: 60-189980 (1985-09-01), None
patent: 07-256902 (1995-10-01), None

Affiliated with

Also associated with

Rating

Light emitting device drive circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Light emitting device drive circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light emitting device drive circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3823890