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:
Mar. 31, 1998
Filed:
Jul. 22, 1996
Tadashi Kajino, Okazaki, JP;
Nidek Co., Ltd., Aichi, JP;
Abstract
A lens meter in which a measuring light flux is projected against a lens to be examined and the optical characteristics of the examined lens are measured in reference to the position of an image formed on a light receiving element by the measuring light flux passed through the examined lens is comprised of a mode changing-over device changing-over to a mode for measuring an additive diopter of a progressive focus lens, a measuring device for continuously measuring a refractive power of the examined lens, a reference position setting device for sensing a position having a predetermined optical characteristics of the progressive multifocus lens and defining a reference position of the examined lens, a displacement sensing device for sensing a displacement position of a measuring point from the reference position, and a displaying device for displaying the displacement sensed by the displacement sensing device. In addition, there are a provided lateral displacement sensing device for sensing a lateral displacement of a measuring point of the examined lens, a sensing device for sensing the right and left ends of a progressive section of the progressive focus lens, and a progressive section displaying device for displaying the progressive section in response to the results obtained by the sensing device and the lateral displacement sensing device.