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:
May. 07, 1996
Filed:
Dec. 22, 1994
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The optical pickup of the invention includes a hologram mirror for directing an optical axis of a light beam emitted from a light source to be perpendicular to the recording face of a recording medium. The hologram mirror includes: a light transmissive substrate having a first surface and a second surface which are opposite to each other, the light beam from the light source entering the substrate from the first surface; a transmissive holographic element, formed on the first substrate, for diffracting the light beam incident thereon to generate a plurality of diffracted beams; and a reflective film, formed on the second surface of the substrate, for reflecting the diffracted beams, wherein the holographic element includes a blazed grating which is designed to make a predetermined one of the diffracted beams most intense.