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:
Nov. 17, 1998
Filed:
Nov. 20, 1995
Kenichi Kikuchi, Daito, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A calculation circuit compares a current focus evaluation value provided from a focus evaluation value generation circuit, with a focus evaluation value, of one preceding field stored in a memory, to determine whether a CCD is in-focus or not. The calculation circuit provides a driving signal VD to a linear motor so that the CCD moves toward the in-focus position. A position prediction circuit predicts the position where the CCD arrives after a predetermined time period according to the driving signal VD. A comparator circuit compares a predicted result from the position prediction circuit with the actual moved position of the CCD detected by a position detection circuit to provide a signal Dpr corresponding to an amount of load according to the comparison result. A correction value determination circuit and a bias determination circuit correct the level of driving signal VD in response to signal Dpr to supply a second corrected driving signal VD2 to a voice coil.