Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2008-12-15
2011-11-15
Dougherty, Thomas (Department: 2837)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
Reexamination Certificate
active
08058770
ABSTRACT:
In a drive circuit for a piezoelectric actuator, it is possible to move a movement object to a target position rapidly and with good precision. Parameters for two types of drive pulses (PL1, PL2) having different duty ratios are stored in a register (28). A pulse generation circuit (26) is configured so as to be able to switch, based on a parameter stored in the register (28), between (PL1) having a large displacement step width of a lens (8), and (PL2) having a small displacement step width. The lens (8) can be rapidly moved through coarse movement by (PL1), and the lens (8) can be made to approach the target position with good precision through fine movement by (PL2).
REFERENCES:
patent: 5917267 (1999-06-01), Miyazawa et al.
patent: 2006/0082253 (2006-04-01), Hara
Kamiya Tomonori
Yamada Yoshihisa
Addison Karen B
Dougherty Thomas
Oliff & Berridg,e PLC
Sanyo Electric Co,. Ltd.
Sanyo Semiconductor Co. Ltd.
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