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:
Dec. 12, 1995
Filed:
Feb. 02, 1994
Shinichi Yoshida, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A demagnetizer for display unit which allows to reliably demagnetize without bothering the user thereof. A start pulse a1 is sent out from a timer 21 to an activating pulse generating circuit 22 in every predetermined time t1 to sent out an activating pulse b. Receiving the activating pulse b, a demagnetizing current generating circuit 23 sends out a demagnetizing current I to a degauss coil 1 to demagnetize a magnetized shadow mask (or aperture grille). The activating pulse b is also supplied to a reset pulse generating circuit 24 to send out a reset pulse c to the timer 21. Thereby a counting of the timer 21 is reset and the start pulse a1 is sent out as the predetermined time t1 elapses. This demagnetizer allows to carry out the demagnetizing action without bothering the user.