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. 16, 2015
Filed:
Oct. 25, 2012
Izumi Itoh, Tokyo, JP;
Hideaki Hirai, Kanagawa, JP;
Izumi Itoh, Tokyo, JP;
Hideaki Hirai, Kanagawa, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
An image pickup lens has a focal length far from a position of a transparent member. An image pickup device is put on the side of the transparent member the same as that of a light source and takes reflected light including regular reflection from an interface between an adhered object on the other surface of the transparent member and air. Assuming an incident angle of the emitted light on the transparent member when the light reflected in regular reflection by the other surface of the transparent member is incident on the image pickup lens being θs, an incident angle of a typical light beam of the emitted light falls within θs−30 deg through θs and an incident angle of a main element of the emitted light is less than θs.