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US 5,689,108 AGranted
Integrated optical pick-up
AssigneeVictor Company of Japan, Ltd.
InventorMinoru Ohyama
Life of this patent
Estimating the term…
Abstract
A light beam generated by a laser diode travels straight through a holographic beam splitter and other optical elements without undergoing any optical modifications up to an information storage disk (disc), and a return beam reflected on the disk (disc) surface is diffracted and divided into two beams by the holographic beam splitter. The divided two beams are reflected by mirrors respectively and irradiate photo-detectors respectively. A monitoring beam is generated at the back of the laser diode, and is reflected by an additional mirror and irradiates an additional photodetector.
Claims11
An optical pick-up comprising:
- a laser diode for generating a light beam said light beam reaching to an information storage means and reflected thereby to form a return beam,
- a mirror for directing said return beam;
- diffraction means for diffracting said return beam;
- photo detecting means for detecting said return beam diffracted by said diffraction means and directed by said mirror to said photodetecting means;
- said mirror being provided only in a path of said return beam, said laser diode being provided on a substrate on which said photo detecting means is provided;
- transparent plastic means for covering and sealing said substrate, said photo detecting means, and said laser diode, and
- said mirror being provided on said transparent plastic means.
4 more elements
Dependencies are inferred from the claim text.