Dust removing device and dust removing method

Patent metadata

Field	Value
Publication number	US-9571709-B2
Application number	US-201514601309-A
Country	US
Kind code	B2
Filing date	Jan 21, 2015
Priority date	Nov 26, 2009
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

In a piezoelectric device, a first electrode and a second electrode are disposed to be opposed to each other on plate surfaces of the piezoelectric device, a first electrode plane of the piezoelectric device is fixedly bonded to a plate surface of a vibrating plate, a piezoelectric material forming the piezoelectric device is polarized in a direction parallel to the first electrode plane, the piezoelectric device is fixed to a base through a second electrode plane of the piezoelectric device, and the piezoelectric device generates a thickness-shear vibration with the fixed second electrode plane being a reference plane. The piezoelectric vibration generated by the piezoelectric device generates a flexural vibration in the vibrating plate, to thereby remove dust adhering to a surface of the vibrating plate.

First claim

What is claimed is:

1. A dust removing device, comprising:
a piezoelectric device in a form of a plate including a piezoelectric material in a form of a plate and a pair of planar electrodes disposed to be opposed to each other on surfaces of said piezoelectric material; and
a vibrating plate,
wherein a first planar electrode of said pair of planar electrodes is bonded to a plate surface of said vibrating plate,
wherein said piezoelectric material is polarized parallel to a plane of said first planar electrode or in a direction inclined by not more than 10° with respect to the plane of said first planar electrode,
wherein a second planar electrode of said pair of planar electrodes is for fixing to a base, and
wherein said piezoelectric device generates a thickness-shear vibration for displacing said first planar electrode and said second planar electrode from each other.

2. The dust removing device according to claim 1 , wherein said piezoelectric device and said vibrating plate contact each other across an area smaller than ½ of an area of said vibrating plate.

3. The dust removing device according to claim 1 ,
wherein said piezoelectric device is in a rectangular solid shape, and
wherein said piezoelectric material is polarized parallel to a side of said rectangular solid shape.

4. The dust removing device according to claim 1 , wherein said piezoelectric device is disposed on an end portion of said plate surface of said vibrating plate.

5. A vibrating apparatus comprising:
a piezoelectric element comprising a piezoelectric material;
a pair of opposing electrodes; and
a vibrating member,
wherein said piezoelectric material is polarized parallel to a plane of one of said electrodes or in a direction inclined by not more than 10° with respect to the plane of one of said electrodes, and said piezoelectric element generates a thickness-shear vibration by applying a voltage to said electrodes.

6. The vibrating apparatus according to claim 5 , wherein said piezoelectric material has a Pb content of 1000 ppm or less.

7. The vibrating apparatus according to claim 5 , wherein said piezoelectric material comprises titanium and barium.

8. The vibrating apparatus according to claim 5 , wherein said vibrating member comprises an optical material.

9. The vibrating apparatus according to claim 5 , which comprises said piezoelectric element in plurality.

10. An electronic apparatus comprising said vibrating apparatus according to claim 5 .

Assignees

• Canon Kk

Inventors

• Ifuku Toshihiro
• Furuta Tatsuo
• Saito Hiroshi
• Takeda Kenichi

Classifications

• H04N23/811

  by dust removal, e.g. from surfaces of the image sensor or processing of the image signal output by the electronic image sensor · CPC title

• H04N23/52

  Elements optimising image sensor operation, e.g. for electromagnetic interference [EMI] protection or temperature control by heat transfer or cooling elements · CPC title

• G03B17/14

  interchangeably · CPC title

• G03B11/00

  Filters or other obturators specially adapted for photographic purposes · CPC title

• G02B27/0006 Primary

  with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B) · CPC title