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:
Dec. 12, 2023
Filed:
Nov. 15, 2021
Zhuhai Pantum Electronics Co., Ltd., Zhuhai, CN;
ZHUHAI PANTUM ELECTRONICS CO., LTD., Zhuhai, CN;
Abstract
Optical scanner and electrophotographic image forming apparatus are provided. The optical scanner includes a light source, configured to emit a light beam; an optical deflector, configured to deflect the light beam emitted from the light source; a first optical unit, arranged there-between and including a refraction unit and a diffraction unit; and a second optical unit, arranged in a light exit direction of the optical deflector and configured to make the light beam deflected by the optical deflector form an image on a scanning target surface. A range of a ratio of a refractive power Φto a diffractive power Φof the first optical unit in a main scanning direction is 0.3<Φ/Φ<0.5; and a range of a ratio of a refractive power Φto a diffractive power Φof the first optical unit in a sub scanning direction is 0.7<Φ/Φ<1.0.