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. 16, 2006
Filed:
Aug. 27, 2004
Kazushi Mori, Hirakata, JP;
Shingo Kameyama, Ibaraki, JP;
Hitoshi Hirano, Nishinomiya, JP;
Koutarou Furusawa, Higashiosaka, JP;
Koji Tominaga, Hirakata, JP;
Masayuki Shono, Hirakata, JP;
Kazushi Mori, Hirakata, JP;
Shingo Kameyama, Ibaraki, JP;
Hitoshi Hirano, Nishinomiya, JP;
Koutarou Furusawa, Higashiosaka, JP;
Koji Tominaga, Hirakata, JP;
Masayuki Shono, Hirakata, JP;
Sanyo Electric Oc., Ltd., Osaka, JP;
Abstract
The present invention provides a wave plate capable of obtaining preferable phase conversion characteristic over a wide wavelength range. The wave plate includes an aluminum oxide film having linear grating groove patterns. The period L (μm) and the duty ratio De of the grating groove patterns are set at values within the first range specified by the following four formulas:L≦0.65≧2×10≦6.0317−10.3525.0516(−0.85)/0.44+(−0.41)/0.39≦1