Open loop laser power control for optical navigation devices...

Details Open loop laser power control for optical navigation devices... Open loop laser power control for optical navigation devices...

2007-04-24

2007-04-24

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular beam control device

Modulation

C345S166000, C372S038040, C372S038070, C372S038090

Reexamination Certificate

active

10778869

ABSTRACT:
A current output of a drive signal, modulated between two current settings, is applied to a laser diode, e.g. VCSEL. The settings are selected such that laser diode's power output meets the average power and peak power limits of the eye safety standards. The drive signal having a duty cycle toggling between the two settings. The duty cycle is selected such that the average and peak power limits are met for the given upper current setting. The drive circuit may include an analog modulator or digital analog converter (DAC) for maintaining the lower and upper current settings. When the drive circuit is implemented as an integrated circuit, the DAC may be incorporated into the IC. The sensitivity of the DAC is selected to maintain the desired lower and upper current settings.

REFERENCES:
patent: 4884280 (1989-11-01), Kinoshita
patent: 5604757 (1997-02-01), Liang et al.
patent: 5638176 (1997-06-01), Hobbs et al.
patent: 5872533 (1999-02-01), Snyder et al.
patent: 5953355 (1999-09-01), Kiely et al.
patent: 6424407 (2002-07-01), Kinrot et al.
patent: 6658030 (2003-12-01), Baumgartner et al.
patent: 2004/0022285 (2004-02-01), Romm
patent: 2005/0094154 (2005-05-01), Baney et al.

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