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:
Mar. 02, 2004
Filed:
Feb. 22, 2002
Kowa Kabushiki Kaisha, Nagoya, JP;
Abstract
A ray of light incident via a pin hole ( ) and a field stop ( ) having a field of vision a predetermined angle larger than a telescope's actual field of vision that are disposed on an axis ( ) in parallel to the optical axis ( ) of the telescope is measured in intensity by a photoelectric element ( ). When a quantity of light incident on the photoelectric element is larger than a predetermined quantity of light, a shutter ( ) is inserted into an optical path of the telescope to cut off a ray of light going into the eyes of the observer. Since an incidence of a quantity of light in excess of a predetermined one into a field of vision a predetermined angle larger than the actual field of vision of the telescope will block the optical path of the telescope, a risk such as damage to the eyes of the observer can be eliminated to prevent an accident even when the observer erroneously observes a strong light-generating object such as the sun.