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:
Feb. 29, 2000
Filed:
Aug. 27, 1998
Koki Kato, Gamagori, JP;
Nidek Co., Ltd., , JP;
Abstract
An eye refractive power measurement apparatus for measuring a refractive power of an eye to be examined, the apparatus comprising a projecting optical system for scanning and projecting a slit light bundle onto a fundus of the eye to be examined, a photo-receiving optical system provided with a photo-detector arranged at a conjugate position with a cornea of the eye so as to have a predetermined position with respect to a scanning direction of the slit light bundle and an open diaphragm, can be arranged at different predetermined positions, for reducing the slit light bundle, a selecting device for selecting the position of the open diaphragm so as to change a range in which the photo-receiving optical system can detect an eye refractive power and an eye refractive power calculating device to calculate a refractive power of the eye based on an output signal from the photo-detector receiving the slit light bundle reflected from the fundus of the eye through the open diaphragm and the position of the open diaphragm.