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:
Apr. 08, 2008
Filed:
Aug. 07, 2003
Yutaka Okada, Yamatokoriyama, JP;
Yutaka Okada, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
Substantially all of the laser light emitted from laser chip(s)toward optical disk(s)may be transmitted through polarizing hologram(s)and may thereafter be transmitted through quarter-wave plate(s)and after being reflected at optical disk(s)may again be transmitted through quarter-wave plate(s)and be incident on polarizing hologram(s). Accordingly, where laser light is transmitted twice through quarter-wave plate(s)the direction(s) of polarization thereof may be rotated by 90 degrees before it is incident on polarizing hologram(s)For this reason, even if laser light is p-polarized when it is transmitted through polarizing hologram(s)from laser chip(s)it may be s-polarized when it is again transmitted through polarizing hologram(s)after being reflected from optical disk(s)Laser light, after being made s-polarized, may be diffracted by polarizing hologram(s)which diffracts only s-polarized light. Light of order ±1 produced as a result of diffraction of laser light by polarizing hologram(s)may be incident on photodiode(s)
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile