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:
Oct. 13, 1998
Filed:
Jul. 05, 1995
Hirotoshi Takemori, Nara, JP;
Tetsuya Inui, Nara, JP;
Toshikazu Nagaura, Nara, JP;
Kenji Ohta, Kitakatsuragi-gun, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
It can be selected whether to form a both-side wobble groove whose both side walls wobble by irradiating two light beams while oscillating the same along the radius of a magneto-optical master disk, or to form a one-side wobble groove one of whose side walls alone wobbles by irradiating two light beams while fixing one of the same and oscillating the other along the radius of the magneto-optical master disk. Then, either a single one-side or both-side groove for tracking-use is formed by irradiating both the two light beams on a photo-resist applied on a glass substrate in accordance with address data. As a result, grooves of different types, both-side and one-side grooves, can be formed continuously in the exposing process.