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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.:

US 10754239 B1

PDFFull Text
Date of Patent:
Aug. 25, 2020

Filed:

Apr. 18, 2019

Projection optical assembly and projector device

Applicant:

Nittoh Inc., Suwa-shi, Nagano, JP;

Inventor:

Takahiko Matsuo, Nagano, JP;

Assignee:

NITTOH INC., Suwa-Shi, Nagano, JP;

Attorney:

Thompson Hine L.L.P.

Primary Examiner:

Michelle M Iacoletti

Assistant Examiner:

Danell L Owens

Int. Cl.
CPC ...
G03B 21/28 (2006.01); G02B 13/16 (2006.01); G02B 13/18 (2006.01); G02B 13/22 (2006.01); G02B 15/16 (2006.01); G02B 15/20 (2006.01); G02B 17/08 (2006.01); G02B 15/15 (2006.01); G03B 21/14 (2006.01); H04N 9/31 (2006.01); G02B 15/163 (2006.01);
U.S. Cl.
CPC ...
G03B 21/28 (2013.01); G02B 13/16 (2013.01); G02B 13/18 (2013.01); G02B 13/22 (2013.01); G02B 15/15 (2013.01); G02B 15/163 (2013.01); G02B 15/20 (2013.01); G02B 17/08 (2013.01); G03B 21/147 (2013.01); H04N 9/315 (2013.01); H04N 9/317 (2013.01); H04N 9/3197 (2013.01);
Abstract

A projection optical system () that projects from a first image plane on a reducing side to a second image plane on an enlargement side, including a first refractive optical system () that includes eight lenses (L) to (L) and forms a first intermediate image () on the enlargement side using light that is incident from the reducing side, a second refractive optical system () that includes six lenses (L) to (L) and forms the first intermediate image () on the reducing side into a second intermediate image () on the enlargement side, and a first reflective optical system () that includes a first reflective surface () with positive refractive power that is positioned closer to the enlargement side than the second intermediate image ().

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