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Title:
GRADIENT INDEX LENS, OPTICAL PRODUCT, OPTICAL DEVICE, GLASS COMPOSITION FOR GRADIENT INDEX LENS, AND METHOD FOR MANUFACTURING GRADIENT INDEX LENS
Document Type and Number:
WIPO Patent Application WO/2020/158043
Kind Code:
A1
Abstract:
A gradient index lens (1b) has a depth of field of 1.5 to 3.0 mm. The depth of field is determined by subtracting the minimum operating distance from the maximum operating distance. The value of a modulation transfer function (MTF) for a spatial frequency of six lines per millimeter is 30% or greater in an operating distance.

Inventors:
KATO HIROAKI (JP)
TANIGUCHI SATOSHI (JP)
KANEKO MASAFUMI (JP)
YAMANE TSUYOSHI (JP)
SATO KENICHI (JP)
TAKAGI TOMITAKA (JP)
Application Number:
PCT/JP2019/037373
Publication Date:
August 06, 2020
Filing Date:
September 24, 2019
Export Citation:
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Assignee:
NIPPON SHEET GLASS CO LTD (JP)
International Classes:
G02B3/00; C03C3/078; C03C3/085; C03C3/089; C03C3/091; C03C3/093; C03C3/095; C03C3/097; C03C21/00
Domestic Patent References:
WO2013146873A12013-10-03
Foreign References:
JPH06276359A1994-09-30
JP2013243635A2013-12-05
JP2001174606A2001-06-29
JP2000035519A2000-02-02
JPH07198979A1995-08-01
JP2007529398A2007-10-25
JP2013541722A2013-11-14
JP2004292215A2004-10-21
JP2014234487A2014-12-15
JP2018118904A2018-08-02
Attorney, Agent or Firm:
KAMADA Koichi et al. (JP)
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