Focusing device with uninterrupted excitation

Details Focusing device with uninterrupted excitation Focusing device with uninterrupted excitation

2011-08-02

2011-08-02

Laballe, Clayton E (Department: 2862)

Television

Camera, system and detail

Optics

C396S133000

Reexamination Certificate

active

07990464

ABSTRACT:
A focusing device includes a vertical-synchronization-signal generator generating a vertical-synchronization-signal sequence including vertical synchronization signals, an excitation-sequence generator generating an excitation sequence according to the vertical-synchronization-signal sequence and applying excitation according to the excitation sequence, and a driving module driving a lens of an imaging system according to the excitation sequence. Vertical-synchronization-signal times are formed between two adjacent vertical synchronization signals. A first vertical-synchronization-signal time and a last vertical-synchronization-signal time are formed at a beginning and an end of the vertical-synchronization-signal sequence respectively. Each vertical-synchronization-signal time includes a sub time and an exposure time arranged sequentially. A preceding excitation is only applied in the sub time of the first vertical-synchronization-signal time, a succeeding excitation is only applied in sub time of the last vertical-synchronization-signal time and a phase-fixed excitation is applied in each exposure time of each vertical-synchronization-signal time except the exposure time of the last vertical-synchronization-signal time.

REFERENCES:
patent: 2007/0247542 (2007-10-01), Watanabe et al.
patent: 2007/0273783 (2007-11-01), Okazaki et al.
patent: 2008/0007644 (2008-01-01), Matsumoto

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