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:
Jan. 03, 1995
Filed:
Apr. 26, 1993
Tadashi Kajino, Okazaki, JP;
Mikio Kurachi, Aichi, JP;
Nidek Co., Ltd., Aichi, JP;
Abstract
A lens meter projects measuring light onto a lens, detects the measuring light traveled through the lens at a light detecting element, and determines the optical characteristics of the lens on the basis of the detected data obtained from the light detecting element. The lens meter provides a display device for displaying the relation to adjust the lens to the optical axis of the measuring optical path, measuring mode selector device for selecting a measuring mode from a single focus lens measuring mode to a progressive focus lens measuring mode, a control device for measuring the lens at position measuring points distributed at predetermined intervals on the lens successively on a measuring optical axis and measuring the refractive power of the lens at each measuring point. A dislocation between a vertical standard line, on which a measuring position of the refractive power of the far viewing section, crossing a horizontal standard line on a progressive focus lens and passing through a geometrical center thereof is calculated based on the refractive power of the progressive focus lens at each measured position, and a measuring optical axis of the measuring optical path, and a movement conducting mark is displayed on the display device to conduct the measuring to the vertical standard line direction based on the calculated data.