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:
Apr. 17, 1990
Filed:
Jan. 11, 1989
Dennis H Goldstein, Niceville, FL (US);
Other;
Abstract
An achromatic infrared retarder is described which comprises a substrate supporting an optically reflective surface, two identical prisms of preselected optical material disposed in confronting relationship with the reflecting surface therebetween and defining an optical axis through the prisms along which a light beam is selectably directable, each prism having a first optical surface orientable perpendicular to the optical axis, a second optical surface disposed at a preselected angle to the first surface, and a third optical surface disposed at the preselected angle to the second surface, the angle preselected in size corresponding to the material comprising the prisms in order to provide total internal reflection of a light beam directed along the axis at the second surface, the prisms being disposed so as to define a region bounded by respective third optical surfaces of the prisms and the reflective surface therebetween.