Driving apparatus
AssigneeMinolta Co., Ltd.
InventorHiroji Katsuragi
Life of this patent
Estimating the term…
Abstract
A lens driving actuator comprises a lens barrel formed of piezoelectric material, an electrode pair comprising a pair of venetian blind-like electrodes opposed to the interior surface of the lens barrel in the axial direction, and a high frequency wave power source for exciting the electrodes of the electrode pair which are arranged so as to form a waveguide between the electrode pair on the interior surface of the lens barrel such that elastic surface waves travel this waveguide in the axial direction via the excitation of the electrodes of the electrode pair and a lens pressing against the waveguide.
Claims13
A driving apparatus comprising:
- a barrel formed of piezoelectric material and having an interior surface;
- an electrode pair opposed to the surface of the barrel and forming a waveguide between the electrode pair on the interior surface of the barrel;
- and
- a driven member movably supported in the barrel and pressing against the waveguide.
A driving apparatus comprising:
- a barrel formed of piezoelectric material;
- a first electrode pair opposed to the surface of the barrel and forming a first waveguide between the first electrode pair on the interior surface of the barrel;
- a second electrode pair opposed to the surface of the barrel and forming a second waveguide between the second electrode pair on the interior surface of the barrel;
- a first driven member movably supported in the barrel and pressing against the first waveguide;
- and
- a second driven member movably supported in the barrel and pressing against the second waveguide.
A method for making a drive unit, the method comprising the steps of:
- forming a barrel from raw powder of piezoelectric material and binder resin;
- sintering the barrel;
- lapping the internal surface of the barrel;
- and
- forming an electrode pair opposed to the surface of the barrel.
Dependencies are inferred from the claim text.