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:
Jan. 24, 2023
Filed:
Sep. 29, 2020
Applicant:
Union Optech Co., Ltd., Guangdong, CN;
Inventors:
Liwei Quan, Guangdong, CN;
Jianhua Li, Guangdong, CN;
Assignee:
UNION OPTECH CO., LTD., Zhongshan, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 21/28 (2006.01); G02B 9/06 (2006.01); G02B 13/16 (2006.01); G02B 13/18 (2006.01); G02B 5/00 (2006.01); G02B 17/08 (2006.01);
U.S. Cl.
CPC ...
G03B 21/28 (2013.01); G02B 5/005 (2013.01); G02B 9/06 (2013.01); G02B 13/16 (2013.01); G02B 13/18 (2013.01); G02B 17/08 (2013.01);
Abstract
An optical system and a projection device are provided. The optical system includes a display unit, a first lens group, a second lens group, and a reflector in sequence along a transmission direction of light; both the first lens group and the second lens group have positive focal powers; the optical system satisfies the following relationship: 0.01≤|φ|≤0.02 and 0.005≤||≤0.015; φrepresents a focal power of the first lens group, and φrepresents a focal power of the second lens group.