Title:
OPTICAL GLASS
Document Type and Number:
WIPO Patent Application WO/2017/090645
Kind Code:
A1
Abstract:
An optical glass is provided which is suitable as an imaging lens used in a vehicle-mounted camera exposed to harsh environments, has a high refractive index and high strength, has excellent crack resistance, and has a sufficiently low glass transition point and devitrification temperature. In this optical glass, nd is 1.70-2.10, Tg is 500-630°C, the devitrification temperature is less than or equal to 1300°C, the specific gravity is 4.0 g/cm3 or less, the crack initiation load (CIL) is greater than or equal to 20 gf, and the fracture toughness (Kc) is greater than or equal to 0.60 MPa⋅m1/2.
Inventors:
AKIBA SHUSAKU (JP)
NAGASHIMA TATSUO (JP)
SAWAMURA SHIGEKI (JP)
NAGASHIMA TATSUO (JP)
SAWAMURA SHIGEKI (JP)
Application Number:
PCT/JP2016/084716
Publication Date:
June 01, 2017
Filing Date:
November 24, 2016
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C03C3/062; C03C3/064; C03C3/066; C03C3/097; C03C3/112; G02B1/00
Foreign References:
| JP2010105897A | 2010-05-13 | |||
| JP2014131948A | 2014-07-17 | |||
| JP2007169157A | 2007-07-05 | |||
| JP2011037660A | 2011-02-24 | |||
| JP2013256446A | 2013-12-26 |
Other References:
See also references of EP 3381871A4
Attorney, Agent or Firm:
SAKURA PATENT OFFICE, P.C. (JP)
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