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:
Jun. 28, 1983
Filed:
May. 06, 1982
Nippon Kogaku K.K., Tokyo, JP;
Abstract
An eye-refractometer device has a beam splitter, a projection optical system provided in one light path of the beam splitter for projecting a light beam into the pupil of an eye to be examined and scanning the light beam, a condenser optical system provided in the other light path of the beam splitter for receiving the reflected light from the retina of the eye, the condenser optical system comprising a condenser lens, a diaphragm member and a light-receiving member, and a signal processing system for processing the signal from the light-receiving member. Light beam rotating means for rotating the light beam about the optic axis is provided between the beam splitter and the eye. The light-receiving member is fixedly disposed at a position substantially conjugate with the cornea of the eye with respect to the condenser lens and a plurality of light-receiving elements are provided on the light-receiving surface of the light-receiving member off the optic axis. The diaphragm member is fixedly disposed between the beam splitter and the light-receiving member. Phase difference detecting means for detecting the phase differences between the output signals from the plurality of light-receiving elements is provided as the signal processing system.