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:
Nov. 10, 1998
Filed:
Apr. 23, 1997
Tsuyoshi Haraguchi, Tokyo, JP;
Kabushiki Kaisha TOPCON, Tokyo, JP;
Abstract
A noncontact tonometer for measuring intraocular pressure is provided. When a rotary solenoid (7) is supplied with electric power, a piston (4) within a cylinder (2) is moved up, and thereby air is jetted through a nozzle (9) of a head (3) toward an eye (H) of a subject. At the same time, infrared rays are projected onto the eye (H) from a light source (11). Reflected light from a cornea of the eye (H) is received by a light receiving sensor (12). A signal generated by the light receiving sensor (12) is transmitted to a control circuit (16) via a flat-state detecting circuit (13). As a result, the intraocular pressure of the eye (H) is measured. The noncontact tonometer further includes two condensers (17, 18). A command from the control circuit (16) is input to a condenser switching portion (20) by operating a driving switch (21). Thereby, one of the condensers (17, 18) is selected to supply the rotary solenoid (7) with the electric power.