The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2000
Filed:
Apr. 12, 1999
Kenichiro Shibata, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
Zinc sulfide and an optical component are provided that significantly reduces transmission for visible light and infrared rays of not more than 3 .mu.m in wavelength, having high transmittance for infrared rays in the wavelength range of 8-12 .mu.m, and that shields visible light. The optical component is constituted by a polycrystalline zinc sulfide sintered compact formed by hot compression molding fine zinc sulfide powder of high impurity at the temperature of 900-1000.degree. C. and the pressure of 150-800 kg/cm.sup.2. The light transmittance at the region where the thickness is 2 mm is 0% to 3% at the wavelength range of visible light, 0% to 20% at the wavelength range of 2.5-3 .mu.m, 30% to 75% at the wavelength range of 8-12 .mu.m, and 50% to 90% at the same wavelength range with the formation of antireflection coating film.