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. 18, 1991
Filed:
Jun. 28, 1989
Applicant:
Inventors:
Itsuo Takanashi, Kamakura, JP;
Shintaro Nakagaki, Fujisawa, JP;
Hirohiko Shinonaga, Yokohama, JP;
Tsutou Asakura, Yokohama, JP;
Masato Furuya, Yokosuka, JP;
Hiromichi Tai, Yokosuka, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G02F / ;
U.S. Cl.
CPC ...
324 96 ; 350356 ; 350384 ;
Abstract
An apparatus for detecting a distribution of a surface potential on a measured object comprises a reading head opposing the measured object. The reading head includes an optical modulator subjected to an electric field representative of the surface potential distribution. The electric field applied to the optical modulator is varied in an alternating manner.