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. 17, 1989
Filed:
Nov. 10, 1987
Shigeki Hamaguchi, Aichi, JP;
Yasuhiro Ohtsuka, Toyota, JP;
Tomoyoshi Motohiro, Seto, JP;
Yasunori Taga, Nagoya, JP;
Masahiko Ishii, Aichi, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi, JP;
Abstract
A birefringent plate comprising a transparent substrate and an obliquely evaporated film formed on the transparent substrate, is free from the visual angle dependence because the obliquely evaporated film is formed into a multilayer composition and the neighboring layers have a different evaporation direction. Moreover, a manufacturing method for the birefringent plate, using a device constituted of a vacuum chamber and a crucible having a large number of inclined through holes, is capable of making the film thickness of the obliquely evaporated film uniform.