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. 07, 1995
Filed:
Dec. 19, 1994
Hiroshi Iijima, Tokyo, JP;
Kabushiki Kaisha Topcon, Tokyo, JP;
Abstract
A noncontact type tonometer is provided which is capable of easily detecting whether optical members of the tonometer are stained with dirt or not, and easily finding which one of the optical members is stained. In the noncontact type tonometer, alignment light emitted by an alignment light source is guided to a subject's eye through an alignment light projecting optical system. Part of the alignment light reflected by the eye does not pass through a discharging nozzle and is received by a first light receiving sensor of a first alignment detecting optical system. On the other hand, the other part of the alignment light reflected by the eye passes through the discharging nozzle and is received by a second light receiving sensor of a second alignment detecting optical system. Stains on the optical members are found by a measuring device by which a quantity level of reflected alignment light received by each of the first and second sensors is detected and compared with each other. If the optical members are not stains, pulsed air is discharged from the nozzle toward the eye.