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. 13, 1985
Filed:
Jun. 16, 1982
Masao Nohda, Yokosuka, JP;
Nippon Kogaku K. K., Tokyo, JP;
Abstract
An automatic lens meter includes a first positive lens system, a second positive lens system having its forward focal plane coincident with the rearward focal plane of the first positive lens system, a pin-hole plate disposed in the forward focal plane of the second positive lens system, the optical axis of the first and second positive lens systems passing through the pin-hole of the pin-hole plate, four spot light source means disposed on the forward focus side of the first positive lens system, the four spot light source means being provided in a plane orthogonal to the optical axis and made conjugate with a predetermined position on the rearward focus side of the second positive lens system by the first and second positive lens systems, a lens to be examined being disposed at said predetermined position, a third positive lens system provided on the side opposite to the second positive lens system with respect to said predetermined position, light-receiving means disposed on the opposite side of the second positive lens system with respect to the third positive lens system, the light-receiving means producing a signal corresponding to the position, on the light-receiving surface of the light-receiving means, of an optical image corresponding to each of the four spot light source means, and converter means for converting the output signals of the light-receiving means into diopters D.sub.1, D.sub.2 and principal meridians axis degree .theta..