Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – Plural light emitting devices
Patent
1997-12-30
2000-08-22
Jackson, Jr., Jerome
Active solid-state devices (e.g., transistors, solid-state diode
Incoherent light emitter structure
Plural light emitting devices
257 13, 257 98, 257 99, 257 91, 372 46, 372 50, H01L 2941, H01L 3300, H01S 319
Patent
active
061076465
ABSTRACT:
A variable light capable of varying the size of light beam and an optical pickup apparatus for a different-type optical disc employing the same. The variable light source is provided with a double hetero structure formed to incorporate a multiple quantum well active layer on a semiconductor layer, a current confined structure for progressing carriers drifting toward the multiple quantum well active layer in a combined direction of a perpendicular direction with a progressing direction of a light beam, and an electrode pattern provided on the upper part of the current confined structure for varying a drift speed of carriers drifting in the progressing direction of light beam by a variable current signal. The variable light source can vary the size of light beam by controlling an amount of the variable current signal. Also, the variable light source generates an appropriate size of light beam in accordance the type of optical disc by the variable current signal, thereby simplifying the configuration of the different-type optical disc pickup apparatus.
REFERENCES:
patent: 5274246 (1993-12-01), Hopkins et al.
patent: 5585957 (1996-12-01), Nakao et al.
patent: 5625201 (1997-04-01), Holm et al.
Jackson, Jr. Jerome
LG Electronics Inc.
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