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:
Jul. 23, 2002
Filed:
Feb. 08, 2001
Koji Akutsu, Nara, JP;
Tatsuya Araki, Ohmihachiman, JP;
Shimadzu Corporation, Kyoto, JP;
Abstract
In a movable type X-ray photographing apparatus, when a lever handle is operated, a force F for pushing the lever handle is inputted into a CPU from right and left pressure sensors provided in the handle. The CPU receives signals of rotational numbers V of motors from right and left encoders, and calculates a pulse width W=&agr;×f (V)×F. In accordance with the calculated pulse width W, a PWM control circuit carries out an ON-OFF duty control of a switching element in a bridge circuit of a motor driving circuit. An output torque T of the motor driving circuit is subjected to a PWM control so as to maintain a relationship (T=&agr;×f). Accordingly, the torque T truly proportional to the pushing force F is outputted from the motor, and a natural operation can be achieved.