Title:
【発明の名称】耐候性試験機用光学フィルター構造体および耐候性試験機
Document Type and Number:
Japanese Patent JP2925799
Kind Code:
B2
Abstract:
Provided is an optical filter structure which has excellent solarization resistance, and stably gives a constant wavelength distribution and constant irradiation energy for a long time, and which efficiently cuts off infrared light including near infrared light and ultraviolet light having a short wavelength and is sufficiently permeable to visible light. The optical filter structure has a glass filter 7 formed of phosphate or fluorophosphate glass containing 0.1 to 5% by weight, as an oxide, of copper oxide and an aquafilter 6 having a liquid layer 5 measuring 3 to 50 mm as a light path length, the glass filter 7 being placed either outside a container wall, 2a or 2b, of the aquafilter 6 or within the liquid layer 5, and the optical filter structure has optical characteristics that the absorption edge on a short wavelength side is a region of light having a wavelength of 250 to 330 nm and that the maximum value of the spectral transmittance on a long wavelength side beyond 780 nm is not more than 40%.
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Inventors:
FUJIWARA SHIGETOSHI
KIJIMA YOSHIO
INOE TADASHI
KIJIMA YOSHIO
INOE TADASHI
Application Number:
JP22069191A
Publication Date:
July 28, 1999
Filing Date:
August 30, 1991
Export Citation:
Assignee:
HOOYA KK
DAINIPPON PURASUCHITSUKUSU KK
DAINIPPON PURASUCHITSUKUSU KK
International Classes:
G02B5/20; F21V9/04; F21V9/12; G01N17/00; G02B5/22; G02B5/24; (IPC1-7): G02B5/24; F21V9/04; F21V9/12; G01N17/00; G02B5/20; G02B5/22
Domestic Patent References:
| JP61131301A | ||||
| JP316933A | ||||
| JP6433154U |
Attorney, Agent or Firm:
Nakamura Shizuo