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Patent Searching and Data


Title:
OPTICAL SYSTEM, IMAGE PROJECTION DEVICE, AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/152968
Kind Code:
A1
Abstract:
The present disclosure pertains to an optical system having therein an intermediate image formation position that is conjugate to an enlargement conjugate point on the enlargement side and a reduction conjugate point on the reduction side. The optical system is provided with an enlargement optical system having a plurality of lens elements and located on the enlargement side from the intermediate image formation position, and a relay optical system having a plurality of lens elements and located on the reduction side from the intermediate image formation position. A first lens element located closest to the enlargement side among the plurality of lens elements in the enlargement optical system is an aspherical lens having negative power, and conditions (1)-(3) are satisfied. Condition (1): 0.0055 <Δpgfn < 0.030 Condition (2): 53 < vdn < 58 Condition (3): 0.28 < fp/fr < 1.0

Inventors:
ZHAO QINGHUA
IMAOKA TAKUYA
YAMADA KATSU
Application Number:
PCT/JP2020/042917
Publication Date:
August 05, 2021
Filing Date:
November 18, 2020
Export Citation:
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Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G02B13/04; G02B13/16; G02B15/20; G03B21/00; H04N5/74
Foreign References:
JP2019095789A2019-06-20
JP2018097047A2018-06-21
JP2019095684A2019-06-20
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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