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Patent Searching and Data


Title:
PROJECTION LENS SYSTEM AND IMAGE PROJECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/131052
Kind Code:
A1
Abstract:
This projection lens system projects a reduction-side image on an enlargement side of an image projection device. The projection lens system is provided with ten or more single lenses constituting a zoom lens including a plurality of movable lens groups. The projection lens system has the diameter IMG of an effective image circle that satisfies 2.5 < Tp/IMG with respect to the length Tp of a transmission optical system disposed on the reduction side of the image projection device. A positive lens, the maximum height H of an on-axis ray of which satisfies 0.5 < |H/D| < 1.0, satisfies 0.01 < Td/D < 0.05 with regard to the outer diameter D and thickness Td at the end of the positive lens.

Inventors:
YAMADA Katsu
IMAOKA Takuya
ONISHI Hideo
IKEO Kenji
Application Number:
JP2018/045027
Publication Date:
July 04, 2019
Filing Date:
December 07, 2018
Export Citation:
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Assignee:
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. (1-61, Shiromi 2-chome Chuo-ku, Osaka-sh, Osaka 07, 〒5406207, JP)
International Classes:
G02B15/20; G03B21/14
Foreign References:
JP2014063026A2014-04-10
JP2012189971A2012-10-04
JP2015118235A2015-06-25
Attorney, Agent or Firm:
KAMATA Kenji et al. (1-61, Shiromi 2-chome, Chuo-ku, Osaka-sh, Osaka 07, 〒5406207, JP)
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