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. 11, 1994
Filed:
May. 05, 1993
Mutsuo Mitsui, Hachiohji, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A ferroelectric liquid crystal is injected into a liquid crystal cell including a pair of substrates each having at least an electrode thereon and disposed with a sealing agent therebetween so as to provide a prescribed gap therein. The liquid crystal is injected while (a) changing a pressure or a pressure and a temperature of an environment of the liquid crystal cell with time so that (i) in an initial stage of injection, the liquid crystal is injected at a suppressed speed, and (ii) in an intermediate stage of injection, the liquid crystal is injected at a controlled speed so that a front end of the liquid crystal injected within the cell progresses at a substantially constant speed, (b) in a final stage of injection, cooling the liquid crystal under a pressure so as to avoid occurrence of a local liquid crystal injection failure due to a difference in thermal expansion coefficient between the liquid crystal and the substrates, and (c) during the pressure-changing step with time, introducing an inert gas into the environment so as to increase the environmental pressure to a pressure exceeding a normal pressure (760 Torr).