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. 13, 2000
Filed:
Nov. 10, 1998
Kuei-Pi Cheng, Taipei, TW;
Gary Hsieh, Taipei, TW;
Mag Technology Co., Ltd., Taipei, TW;
Abstract
An X-ray protection device adapted to be incorporated into a monitor that includes a cathode ray tube actuated by a high voltage from a transformer powered by a low voltage power supply. The X-ray protection device includes a circuit which is coupled to a low voltage output of the transformer to obtain a signal from the transformer to represent the high voltage applied by the transformer to the cathode ray tube. The signal is then voltage divided and analog-to-digital-converted to supply a digital signal to a microprocessor which receives and processes the digital signal to give a comparison result by comparing the digital signal with predetermined upper and lower bounds and a triggering threshold and a switching circuit which is connected to the microprocessor to be actuated by the microprocessor in response to the comparison result to cut off the power supplied to the transformer in order to shut down the monitor if the digital signal is not between the upper and lower bounds or is greater than the threshold for a time period greater than a predetermined time interval.