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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/2021/152967
Kind Code:
A1
Abstract:
The present disclosure is an optical system that includes, internally, an intermediate image forming position that is a conjugate of each of an enlargement conjugate point on an enlargement side and a reduction conjugate point on a reduction side. The optical system comprises: an enlargement optical system that includes a plurality of lens elements and that is positioned more to the enlargement side than the intermediate image forming position; and a relay optical system that includes a plurality of lens elements and that is positioned more to the reduction side than the intermediate image forming position. A plurality of air gaps exists among the lens elements, and the enlargement optical system includes: an enlargement optical system front group that is positioned more to the enlargement side than a longest air gap along an optical axis in the enlargement optical system; and an enlargement optical system rear group that is positioned more to the reduction side than the the longest air gap. The following conditions (1) and (2) are satisfied: (1): 7 < |TS/fw| < 15 (2): 2 < |Tpr/fw| < 7

Inventors:
IMAOKA TAKUYA
ZHAO QINGHUA
YAMADA KATSU
Application Number:
PCT/JP2020/042914
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; G02B13/18; G02B15/20; G03B21/00; H04N5/74
Foreign References:
JP2010256380A2010-11-11
JP2011027891A2011-02-10
JP2019095789A2019-06-20
JP2018180447A2018-11-15
Attorney, Agent or Firm:
YAMAO, Norihito et al. (JP)
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