The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 1998
Filed:
May. 31, 1996
Yang-Oh Choi, Seoul, KR;
Daewoo Electronics Co., Ltd., Seoul, KR;
Abstract
Disclosed is an optical pickup having simplified constitution. A light source for radiating laser beam for reading an optical disc is comprised. A beam splitter for separating the laser beam radiated from the light source into transmitting light and reflecting light and for separating light from the optical disc into transmitting light and reflecting light is provided. Installed is an objective lens for converging light from the beam splitter to form a focus on the optical disc and for forwarding light from the optical disc to the beam splitter. A micro fresnel lens attached on one side of the beam splitter is included. The micro fresnel lens generates astigmatism and converges the incident light from the beam splitter. A photodetector receives light from the micro fresnel lens, reproduces information recorded on the optical disc and detects a focus error. The manufacture of the optical pickup is advantageous and the product has improved quality.