Electric control adjustable filter based on piezoelectric ceramics

Abstract

The utility model provides an electrically-controlled adjustable filter based on piezoelectric ceramics. The electrically-controlled adjustable filter comprises a first collimator, a filter plate and a second collimator which are arranged along the direction of an optical path, the electrically-controlled adjustable filter further comprises a rotating support, piezoelectric ceramics, a fixing base and an elastic piece, the rotating support is provided with a rotating disc part and a handle part, the filter is arranged on the rotating disc part, the piezoelectric ceramics extend in the radial direction of the rotating disc part, the first end of the piezoelectric ceramics is fixedly connected with the fixing base, and the first end of the piezoelectric ceramics is adjacent to the handle part. The piezoelectric ceramic is electrified and deformed to drive the handle part to rotate around the turntable part; the elastic piece is connected with the rotating support, and the elastic piece applies elastic force towards the piezoelectric ceramic to the handle part. The voltage of the piezoelectric ceramic is adjusted, then the deformation expansion and contraction amount of the piezoelectric ceramic can be controlled, the deformation amount of the piezoelectric ceramic is very small, and the deformation amount of the piezoelectric ceramic can be accurately controlled through the voltage, so that the rotating angles of the rotating bracket and the filter plate can be accurately controlled, and then the filtering adjustment of the central wavelength can be accurately performed.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical device field especially, it relates to a kind of electrically controlled adjustable filter based on piezoelectric ceramic. BACKGROUND

[0002] Optical filter is a kind of optical device made of polycarbonate as base material, the surface of optical filter is covered with different functional coating, different functional coating is used to filter out certain part of waveband in light, only allow the wavelength of certain color light to pass through, so it is widely used in different optical fields.

[0003] The conventional method for adjusting the transmission center wavelength is to form an angle between the incident light beam and the optical axis of the optical filter. As the angle increases, the transmission center wavelength will move towards the short wave, thereby achieving the adjustment of the transmission center wavelength.

[0004] The adjustment of the center wavelength needs to be realized by the adjustment of the angle, but the adjustment of the required angle is usually a small amount, so it is difficult to achieve the subtle and accurate rotation or extension. SUMMARY

[0005] The utility model aims at providing a kind of simple and accurate electrically controlled adjustable filter based on piezoelectric ceramic.

[0006] In order to realize the purpose of the utility model, the utility model provides an electrically controlled adjustable filter based on piezoelectric ceramic, which comprises a first collimator, a filter and a second collimator arranged along the optical path direction;The electrically controlled adjustable filter further comprises a rotating support, a piezoelectric ceramic, a fixed seat and an elastic member, the rotating support is provided with a rotating disc part and a handle part, the handle part extends along the radial direction of the rotating disc part, the filter is arranged on the rotating disc part, and the filter rotates around the axis of the rotating disc part with the rotating disc part;The piezoelectric ceramic extends along the radial direction of the rotating disc part, the first end of the piezoelectric ceramic is fixedly connected with the fixed seat, the first end of the piezoelectric ceramic is adjacent to the handle part, and the piezoelectric ceramic is driven to rotate around the rotating disc part by the electric deformation of the piezoelectric ceramic;The elastic member is connected with the rotating support, and the elastic member applies an elastic force to the handle part towards the piezoelectric ceramic.

[0007] Further, the elastic member is a tension spring or a spring, the elastic member extends along the radial direction of the rotating disc part, and the piezoelectric ceramic is closer to the rotating disc part relative to the elastic member.

[0008] Further, the elastic member and the piezoelectric ceramic are located on the same side of the handle part.

[0009] Further, the electrically controlled adjustable filter comprises a housing, the rotating support is rotatably arranged in the housing, the fixed seat, the elastic member and the piezoelectric ceramic are arranged in the housing, the first end of the elastic member is connected with the handle part, and the second end of the elastic member is connected with the housing.

[0010] Further, the power cable of the piezoelectric ceramic is arranged to pass through the shell.

[0011] Further, the rotating support is made of ceramic material.

[0012] Further, the fixing base is made of stainless steel material.

[0013] The piezoelectric ceramic is adjusted in voltage, and then the deformation and expansion of the piezoelectric ceramic can be controlled, the deformation of the piezoelectric ceramic is small, and the deformation can be accurately controlled by voltage, so that the rotating angle of the rotating support and the filter plate can be accurately controlled, and then the filter adjustment of the central wavelength can be accurately controlled. Further, the elastic member is arranged to pass through the shell. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a light path schematic diagram of an electrically controlled adjustable filter embodiment of the utility model.

[0015] The utility model will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0016] Referring to Figure 1 , the electrically controlled adjustable filter comprises a first collimator 11, a filter plate 14, a second collimator 12, a shell 13, a rotating support 2, a piezoelectric ceramic 31, a fixing base 32 and an elastic member 33, the first collimator 11, the filter plate 14 and the second collimator 12 are arranged along a light path direction X, the filter plate 14, the rotating support 2, the piezoelectric ceramic 31, the fixing base 32 and the elastic member 33 are all arranged in the shell 13, and the first collimator 11 and the second collimator 12 are arranged on opposite sides of the shell 13.

[0017] The rotating support 2 is made of ceramic material, the rotating support 2 is provided with a rotating disc part 21 and a handle part 22, the rotating disc part 21 is arranged in a disc shape, the rotating support 2 is rotatably arranged in the shell 13, the handle part 22 extends along the radial direction of the rotating disc part 21 and is connected with the rotating disc part 21, the filter plate 14 is arranged on the rotating disc part 21, and the filter plate 14 rotates around the axis of the rotating disc part 21 along with the rotating disc part 21.

[0018] The piezoelectric ceramic 31 extends along the radial direction of the rotating disc part 21, and the first end of the piezoelectric ceramic 31 is fixedly connected with the fixed seat 32, which is made of stainless steel and is fixedly arranged in the shell 13.

[0019] The first end of the piezoelectric ceramic 31 is adjacent to the handle part 22, and when the piezoelectric ceramic 31 is deformed along its extension direction by electricity, the piezoelectric ceramic 31 can drive the handle part 22 to rotate around the rotating disc part 21. The elastic member 33 is a tension spring or a spring, and extends along the radial direction of the rotating disc part 21. The first end of the elastic member 33 is connected with the handle part 22, and the second end of the elastic member 33 is connected with the shell 13. The elastic member 33 exerts an elastic force on the handle part 22 towards the piezoelectric ceramic 31. Moreover, the piezoelectric ceramic 31 is closer to the rotating disc part 21 than the elastic member 33, and the elastic member 33 and the piezoelectric ceramic 31 are both located on the same side of the handle part 22.

[0020] The power cable 311 of the piezoelectric ceramic 31 penetrates out of the shell 13. When an electric field is exerted on the piezoelectric ceramic 31 through the power cable 311, the ceramic material will be deformed. The deformation is related to the size and direction of the electric field. The greater the electric field, the greater the deformation. By controlling the electric field, the filter can be conveniently adjusted. Moreover, the expansion and contraction of the piezoelectric ceramic 31 can drive the filter plate 14 and the rotating support 2 to rotate, thereby accurately adjusting the filter of the central wavelength.

[0021] Of course, in addition to the embodiment, the elastic member of the present case can also be a torsion spring or the like to reset the rotating support. That is, the two ends of the torsion spring are connected between the rotating support and the shell, which can also achieve the purpose of the present case, and are all within the protection scope of the present utility model.

[0022] As can be seen from the above, by adjusting the voltage of the piezoelectric ceramic, the deformation and expansion of the piezoelectric ceramic can be controlled. Since the deformation of the piezoelectric ceramic is very small, and the voltage can accurately control the deformation, the rotation angle of the rotating support and the filter plate can be accurately controlled, thereby accurately adjusting the filter of the central wavelength.

Claims

1.A piezoelectric ceramic-based electrically controlled adjustable filter, comprising a first collimator, a filter plate and a second collimator arranged along an optical path direction; characterized in that: the electrically controlled adjustable filter further comprises a rotating support, a piezoelectric ceramic, a fixed seat and an elastic member, the rotating support is provided with a rotating disc part and a handle part, the handle part extends along a radial direction of the rotating disc part, the filter plate is arranged on the rotating disc part, and the filter plate rotates with the rotating disc part around an axis of the rotating disc part; the piezoelectric ceramic extends along the radial direction of the rotating disc part, a first end of the piezoelectric ceramic is fixedly connected with the fixed seat, the first end of the piezoelectric ceramic is adjacent to the handle part, and the piezoelectric ceramic is driven to rotate the handle part around the rotating disc part through electrically-induced deformation; and the elastic member is connected with the rotating support, and the elastic member applies an elastic force to the handle part towards the piezoelectric ceramic. 2.The electrically controlled adjustable filter according to claim 1, characterized in that: the elastic member is a tension spring or a spring, the elastic member extends along the radial direction of the rotating disc part, and the piezoelectric ceramic is closer to the rotating disc part relative to the elastic member. 3.The electrically controlled adjustable filter according to claim 2, characterized in that: the elastic member and the piezoelectric ceramic are located on the same side of the handle part. 4.The electrically controlled adjustable filter according to claim 1, characterized in that: the electrically controlled adjustable filter comprises a housing, the rotating support is rotatably arranged in the housing, the fixed seat, the elastic member and the piezoelectric ceramic are arranged in the housing, a first end of the elastic member is connected with the handle part, and a second end of the elastic member is connected with the housing. 5.The electrically controlled adjustable filter according to claim 4, characterized in that: a power cable of the piezoelectric ceramic passes out of the housing. 6.The electrically controlled adjustable filter according to any one of claims 1 to 5, characterized in that: the rotating support is made of a ceramic material. 7.The electrically controlled adjustable filter according to any one of claims 1 to 5, characterized in that: the fixed seat is made of a stainless steel material. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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