Illumination – Light source and modifier – Laser type
Patent
1997-12-10
1999-03-16
Tso, Laura
Illumination
Light source and modifier
Laser type
362109, 362119, 372 36, F21L 700
Patent
active
058821066
ABSTRACT:
A thin profile laser pointer assembly includes a thin profile laser head, a constant voltage laser diode driver circuit, and a coin cell power source all packaged within a thin-profile rectangular housing having a thickness between about 2.0 mm and about 6.0 mm. The laser head includes a thin, rectangular heat sink and a laser diode mounted on a recessed shelf on a front edge of the heat sink. The laser head is slidably received in a mounting channel in a front portion of the housing. The arrangement of the laser head and mounting channel rigidly fixes the laser diode in the X and Z axes while permitting sliding linear movement of the laser diode along a "Y" axis, which defines the optical axis of the laser diode. A lens is mounted in the mounting channel along the optical axis, and a projecting aperture is formed in the front edge of the housing in front of the lens for allowing the laser beam to exit through the front of the housing. The laser beam is focused by sliding the laser head within the channel. The laser diode driver circuit and a contact switch are mounted on a circuit board received and secured over the housing. Contact pads on the circuit board engage corresponding contacts on the battery and laser head assembly to complete the circuit. The constant voltage power regulating circuit utilizes a simple shunt regulator circuit which monitors voltage drain as the battery decays and draws appropriate current levels to provide constant power to the laser diode.
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