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:
Jan. 09, 1996
Filed:
Oct. 07, 1993
Harada Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A control device for an electrically driven telescopic antenna including: a counting signal extracting circuit which detects the altered waveform of an rectified current generated during the forward or reverse rotation of a DC motor so as to extract counting signals; a command device which sends a control stop command to a motor drive control circuit when the counted value of the extracted counting signals reaches a certain preset value; a motor current monitoring circuit which monitors the current flow to the motor and outputs information on the completion of the antenna element extension/retraction action when the motor current value exceeds a prescribed value; and a correction device which corrects the counted value based upon the information outputted by the motor current monitoring circuit. The control device can include a large-capacitance capacitor for absorbing power supply fluctuations. In addition, a CPU that includes a control stop command device and counted-value correcting device can be controlled by an oscillation circuit which starts functioning when extension/retraction command signals are issued and stops such an operation when the rotational operation of the motor is completed.