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:
Oct. 10, 1989
Filed:
Sep. 01, 1988
Jun Hirotomi, Tokyo, JP;
Seiko Instruments Inc., , JP;
Abstract
The actuator has a displacement detector and is driven intermittently through a given displacement. A mean amount of drive signals per one intermittent drive such as a mean duration of drive signals and a mean number of drive pulse signals is calculated through a predetermined number of intermittent drives. The mean amount of drive signals is intermittently applied to the actuator for a given number of intermittent drives without the displacement detection. After the given number of intermittent drives by the calculated mean amount, another intermittent drive with the displacement detection is carried out. At this time, the total duration of the drive pulse signals or number of the drive pulse signals outputted until the completion of the given displacement is compared with the calculated mean amount. If the difference therebetween is greater than a given value, the number of intermittent drives by the mean amount is reduced, or if the difference is much greater, the predetermined number of intermittent drives are carried out once again to calculate an updated mean amount. On the other hand, the difference is smaller than the given value, the number of intermittent drives by the mean amount is increased.