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:
Sep. 16, 2003
Filed:
Apr. 02, 2002
Seiko Epson Corporation, Tokyo, JP;
Abstract
The present invention relates to a light deflective optical system without necessity of use of a plane mirror of which width is narrow, which can prevent variation in pitch of scan lines even with projecting or sinking of a deflective reflecting facet and can prevent a deflective light beam from twisting. The light deflective optical system has at least one deflective reflecting facet capable of being revolved or swiveled about the rotational axis and two stationary plane mirrors disposed to face the deflective reflecting facet wherein a light beam a incident on and thus reflected at the deflective reflecting facet is reflected successively at the stationary plane mirrors and this reflected light beam a is again incident on and reflected at the deflective reflecting facet Assuming as an incident plane as a face containing a light beam a to be first incident on the deflective reflecting facet and being parallel to the rotational axis the light beam a to be first incident on the deflective reflecting facet passes through a space between the stationary plane mirrors and the deflective light beam a after second reflection at the deflective reflecting facet passes through the space