JPH05342682

PURPOSE:To increase the numbers of parts, to shorten a light path and to miniaturize an optical pickup by providing a beam splitter between a flat convex lens, a flat concave lens, and a flat convex lens which collimate a laser beam. CONSTITUTION:A laser beam from a laser beam source 1 is collimated...

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Bibliographic Details
Main Author AJIKI SEIICHI
Format Patent
LanguageEnglish
Published 24.12.1993
Edition5
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:PURPOSE:To increase the numbers of parts, to shorten a light path and to miniaturize an optical pickup by providing a beam splitter between a flat convex lens, a flat concave lens, and a flat convex lens which collimate a laser beam. CONSTITUTION:A laser beam from a laser beam source 1 is collimated by a second flat convex lens 22, a flat concave lens 21, and a first flat convex lens 20, is made coherent flux and protected a disk plane. Reflected light from the disk plane goes back in the same light path, bent by 90 degrees by a beam splitter 5 between the lens 21 and the lens 22, separated into P-polarized light and S-polarized light by a polarization beam splitter 10, and they are made incident an optical detectors 14, 18, respectively. By using this constitution, a optical pickup in which the numbers of parts are increased and a light path is shortened and miniaturization can be realized, is obtained.
Bibliography:Application Number: JP19920150924