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. 20, 2012
Filed:
May. 13, 2009
Applicants:
Zhi Jun Liao, Beijing, CN;
Robert Warren Schmidt, Carmel, IN (US);
Ai Hua Sun, Beijing, CN;
Inventors:
Assignee:
Thomson Licensing, Issy les Moulineaux, FR;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 3/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A key press detecting circuit for detecting the status of the key is provided. The key press detecting circuit comprises a discharging circuit which discharges when the key (K) is pressed; and a voltage detecting circuit, which comprises a combination of a PNP transistor (T) and a NPN transistor (T), wherein when the discharging circuit discharges for a predefined period, the PNP transistor (T) will be turn on, which causes the NPN transistor (T) to be turned on and to output a second signal for a second function.