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:
Apr. 19, 1994
Filed:
Jul. 21, 1993
Applicant:
Inventors:
Akira Suzuki, Yokohama, JP;
Takeo Tsukamoto, Atsugi, JP;
Akira Shimizu, Inagi, JP;
Masao Sugata, Yokohama, JP;
Isamu Shimoda, Zama, JP;
Masahiko Okunuki, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01J / ;
U.S. Cl.
CPC ...
257 10 ; 257435 ; 257462 ; 359 71 ; 313465 ; 313501 ; 313524 ; 2502 / ;
Abstract
An electron emission element comprises a P-type semiconductor substrate and electrodes formed on both ends of the semiconductor substrate. A voltage is applied between said electrodes. The P-type semiconductor substrate is irradiated with light to emit the electrons, generated in the P-type semiconductor substrate by photoexcitation, from an electron emitting face at an end of the P-type semiconductor substrate.