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:
Dec. 31, 1996
Filed:
Dec. 23, 1994
Moriyasu Kanai, Tokyo, JP;
Hirofumi Matsuo, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A telescope includes a master telescope whose aberration has been independently corrected and which has an objective lens and an ocular lens. A rear conversion lens is provided on the image side of the objective lens of the master telescope and is made of a single lens having a concave surface that faces an object side. The rear conversion lens meets the requirements defined by the following relationships: f.sub.o '/f.sub.o >1 and 0.5<(dx.sub.2 /dh.sub.2)/(dx.sub.1 /dh.sub.1)<1.3, wherein 'f.sub.o ' represents the focal length of the objective lens of the master telescope; 'f.sub.o '' represents the resultant focal length of the objective lens of the master telescope and the rear conversion lens; 'dx.sub.1 /dh.sub.1 ' represents an inclination of an incident surface of the rear conversion lens at an incident point thereof, upon which light is incident at a height h.sub.1 ; 'dx.sub.2 /dh.sub.2 ' represents an inclination of an emission surface of the rear conversion lens at an emission point thereof, at which light is emitted from the rear conversion lens at a height h.sub.2 ;h.sub.1 =0.36(f.sub.o).sup.2 /mf.sub.o ; h.sub.2 =0.36(f.sub.o) /m, and m is the magnification of said master telescope.