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:
Feb. 28, 2012
Filed:
Dec. 15, 2008
Yoshihisa Yamada, Inazawa, JP;
Tomonori Kamiya, Ichinomiya, JP;
Yoshihisa Yamada, Inazawa, JP;
Tomonori Kamiya, Ichinomiya, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Sanyo Semiconductor Co., Ltd., Ora-gun, JP;
Abstract
In a control circuit for servo control of a piezoelectric actuator, it is possible to efficiently move a movement object toward a target position in each servo control cycle. A pulse generation circuit () generates a drive pulse a plurality of times within a servo control cycle. The ideal value of the amount of movement in one drive pulse is stored in a register (), and is used to estimate the amount of movement required to reach the target position of a lens () each time a drive pulse is generated. It is possible to switch between coarse movement and fine movement by using two types of drive pulses that have mutually different duty ratios, and the lens () can be rapidly moved by coarse movement when the required amount of movement is large, and fine movement when the required amount of movement is small.