CN201757808U - High positioning accuracy of all-plastic aspheric lens structure and ultra-thin optical lens - Google Patents

Abstract

The utility model discloses a high positioning accuracy and ultra-thin optical lens of full plastic non-spherical lens structure, it includes high temperature resistant bearing and lens cone and focusing ring installed on high temperature resistant bearing, is provided with the diaphragm in the front of the lens cone, is equipped with first lens, second lens, third lens and fourth lens in proper order in the cavity of the lens cone, behind the diaphragm, is equipped with the space ring between first lens and the second lens, between second lens and the third lens, between third lens and the fourth lens correspondingly; the two surfaces of the first lens are aspheric surfaces in a meniscus shape, the two surfaces of the second lens are aspheric surfaces in a biconcave shape, the third lens is aspheric surface in a biconvex shape, and the fourth lens is aspheric surface in a hyperbolic shape. The utility model provides a high pixel, small can use in the high positioning accuracy and the ultra-thin optical lens of touch-sensitive screen more than 40 inches.

Description

High positioning accuracy of all-plastic aspheric lens structure and ultra-thin optical lens

【Technical field】

The utility model relates to an optical lens, in particular to a miniature optical lens for confocal imaging of infrared rays and visible light applied to a high-pixel and large-size touch screen.

【Background technique】

The currently used lenses for touch screens generally have the following shortcomings: low positioning accuracy, image plane offset during visible light and infrared imaging, resulting in reduced imaging quality, and large dimensions.

The market is now mainly low-configuration lenses with 100,000 pixels, and they are too bulky to be used on ultra-thin screens, and they are not sensitive enough to touch positions. The shape of the lens is too large, the outer diameter is generally larger than M8, and most of them are circular, so they cannot be used for ultra-thin screens. It is not sensitive to objects appearing in the range of the touch screen, and the precision is not high.

The utility model is made under such circumstances.

【Content of utility model】

The utility model overcomes the deficiencies of the prior art, and provides a high-pixel, small-volume, high-positioning-accuracy and ultra-thin optical lens that can be used in a touch screen of more than 40 inches.

In order to solve the above-mentioned technical problems, the utility model adopts related technical solutions:

The high positioning accuracy and ultra-thin optical lens of the all-plastic aspheric lens structure is characterized by including a high-temperature-resistant seat, a lens barrel mounted on the high-temperature-resistant seat, and a focusing ring. A diaphragm is arranged at the front end of the lens barrel. A first lens, a second lens, a third lens and a fourth lens are arranged in sequence in the cavity of the barrel and behind the diaphragm, between the first lens and the second lens, between the second lens and the third lens, and between the third lens and the third lens. A spacer ring is correspondingly arranged between the lens and the fourth lens; the two surfaces of the first lens are meniscus-shaped aspheric surfaces, the two surfaces of the second lens are biconcave-shaped aspheric surfaces, and the third lens The aspheric surface of biconvex shape is the fourth lens, and the aspheric surface of hyperbolic shape is the fourth lens.

The high positioning accuracy of the above-mentioned all-plastic aspheric lens structure and the ultra-thin optical lens are characterized in that the surface shapes of the aspheric surfaces of the second lens and the third lens satisfy the following equation:

Z＝cy ² /{1+√[1-(1+k)c ² y ² ]}+α ₁ y ² +α ₂ y ⁴ +α ₃ y ⁶ +α ₄ y ⁸ +α ₅ y ¹⁰ +α ₆ y ¹² +α ₇ y ¹⁴ +α ₈ y ¹⁶ ; in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, k is the conic conic coefficient, and α ₁ to α ₈ respectively represent the The coefficient corresponding to the coordinate.

The high positioning accuracy of the above-mentioned all-plastic aspheric lens structure and the ultra-thin optical lens are characterized in that the system element characteristics of the first lens, the second lens, the third lens, and the fourth lens satisfy the following expressions:- 5<f1<-2, -3<f2<-1.5, 1<f3<5, 1<f4<5; 50<vd12<60, 50<vd34<60, 20<vd56<40, 50<vd89<60 ; Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, Vd12 is the dispersion coefficient of the first lens, Vd34 is the second lens Dispersion coefficient, Vd56 is the dispersion coefficient of the third lens, Vd89 is the dispersion coefficient of the fourth lens.

The high positioning accuracy and ultra-thin optical lens of the above-mentioned all-plastic aspherical lens structure is characterized in that the first surface of the first lens facing the diaphragm direction is an elliptical aspheric surface, and the second surface is an oblate ellipsoidal surface; The first surface of the second lens toward the first lens is non-parabolic, and the second surface is hyperbolic; the first surface of the third lens toward the second lens is an ellipsoid, and the second surface is an ellipsoid; the fourth lens The first surface facing the direction of the third lens is an oblate ellipsoid, and the second surface is a hyperbolic shape.

The high positioning accuracy and ultra-thin optical lens of the above-mentioned all-plastic aspheric lens structure is characterized in that a filter is provided in the cavity of the lens barrel and at the rear of the fourth lens.

The high positioning accuracy and ultra-thin optical lens of the above-mentioned all-plastic aspheric lens structure is characterized in that the high-temperature-resistant seat and the lens barrel are fixed through the screw thread between the focus ring.

Compared with the prior art, the utility model has the following advantages:

1. The micro-digital lens of the present utility model can reach more than 2 million pixels, while the existing micro-digital lens generally has 100,000 or 300,000 pixels.

2. The volume of the utility model that can realize the thickness of the thinnest position is 3MM and the thickest is no more than 5MM.

3. The confocal infrared and visible light imaging of the present invention improves the positioning accuracy and consistency under different illuminations.

4. The utility model can be used for CMOS photosensitive film and CCD with 2 million pixels.

5. The utility model also solves the problems of low yield rate and relatively high cost caused by the difficulty in processing the square asymmetric lens.

【Description of drawings】

Figure 1 is an assembly diagram between the seat and the lens barrel;

Figure 2 is a schematic diagram of a lens.

【Detailed ways】

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

As shown in the figure, the high positioning accuracy and ultra-thin optical lens of the all-plastic aspheric lens structure includes a high-temperature-resistant seat 1, a lens barrel 2 mounted on the high-temperature-resistant seat 1, and a focus ring 3. The lens barrel 2 passes through the The clamping method is installed in the high temperature resistant bearing 1, which limits the lateral movement of the lens barrel 2.

A diaphragm 4 is arranged at the front end of the lens barrel 2 , and a first lens 5 , a second lens 6 , a third lens 7 and a fourth lens 8 are sequentially arranged in the cavity of the lens barrel 2 behind the diaphragm 4 . Spacers 9 are correspondingly provided between the first lens 5 and the second lens 6 , between the second lens 6 and the third lens 7 , and between the third lens 7 and the fourth lens 8 .

The two surfaces of the first lens 5 are meniscus-shaped aspheric surfaces, the two surfaces of the second lens 6 are biconcave-shaped aspheric surfaces, and the third lens 7 is a biconvex-shaped aspheric surface. The quadruple lens 8 is a hyperbolic aspheric surface.

Specifically, the first surface 51 of the first lens 5 toward the diaphragm direction is an elliptical aspherical shape, and the second surface 52 is an oblate ellipsoidal surface; the first surface 61 of the second lens 6 toward the first lens direction is an aspherical shape. Parabolic shape, the second surface 62 is a hyperbolic shape; the first surface 71 of the third lens 7 towards the direction of the second lens is an ellipsoid, and the second surface 72 is an ellipsoid; the first surface of the fourth lens 8 towards the direction of the third lens The surface 81 is an oblate spheroid, and the second surface 82 is a hyperbolic shape. This effectively solves the problem of equalization of various aberrations.

At the same time, the third lens 7 has a high refractive power, and due to its position in the optical system and high refractive index, it can reduce the distortion and reduce the effective aperture of the fourth lens. The first surface of the fourth lens 8 is an oblate ellipsoid, while the second surface must be a hyperbolic aspheric surface, which can effectively reduce the curvature of field. The first lens 5 of the system has positive refractive power, the second lens 6 has negative refractive power, the third lens 7 and the fourth lens 8 have positive refractive power. The combination of the second lens 6, the third lens 7 and the fourth lens 8 has negative refractive power, so that the image aspect of the optical system is mainly moved forward, so that the length of the system is shortened. The high-quality optical lens of the system's all-plastic lens structure can image clearly in the wavelength range of 430nm to 870nm, and realize the confocal micro-optical lens for high-precision positioning and imaging in visible light and infrared light.

In order to reduce the refraction change angle of light between the lenses and control the imaging distortion, the distance between the first lens and the second lens needs to be reduced as much as possible in structure; at the same time, the distance between the third lens and the fourth lens needs to be Increase as much as possible; in order to improve field curvature aberration, the second surface 82 of the fourth lens 8 is designed as a hyperbolic aspheric surface.

The surface shapes of the aspheric surfaces of the second lens and the third lens satisfy the following equation:

Z＝cy ² /{1+√[1-1+kc ² y ² ]}+α ₁ y ² +α ₂ y ⁴ +α ₃ y ⁶ +α ₄ y ⁸ +α ₅ y ¹⁰ +α ₆ y ¹² +α ₇ y ¹⁴ +α ₈ y ¹⁶ ; in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, k is the coefficient of the conic conic curve, α ₁ to α ₈ represent the respective radial coordinates corresponding coefficients. When the k coefficient is less than -1, the surface curve is a hyperbola, when it is equal to -1, it is a parabola, when it is between -1 and 0, it is an ellipse, when it is equal to 0, it is a circle, and when it is greater than 0, it is an oblate circle. Through the above parameters, the shape and size of the aspheric surfaces on the front and rear sides of the lens can be precisely set.

The system element characteristics of the first lens 5, the second lens 6, the third lens 7, and the fourth lens 8 satisfy the following expressions: -5<f1<-2, -3<f2<-1.5, 1<f3 <5, 1<f4<5; 50<vd12<60, 50<vd34<60, 20<vd56<40, 50<vd89<60; among them, f1 is the focal length of the first lens, and f2 is the focal length of the second lens , f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, Vd12 is the dispersion coefficient of the first lens, Vd34 is the dispersion coefficient of the second lens, Vd56 is the dispersion coefficient of the third lens, Vd89 is the dispersion coefficient of the fourth lens Dispersion coefficient.

The high-temperature-resistant bearing 1 and the lens barrel 2 are fixed through the screw fit between the focus ring 3, and the focus ring 3 is rotated to make the lens barrel 2 slide up and down along the bearing.

A filter 10 is also provided in the cavity of the lens barrel 2 and behind the fourth lens 8 . The light enters the CMOS photosensitive chip through the optical filter 10, and the optical filter 10 has a certain protective effect on the CMOS photosensitive chip, and also filters a part of the light at the same time, so that the image color is bright and sharp and has good color reproduction. In addition to solving the problem of color, the optical filter 10 also ensures that the rear focus ring has enough space for focus adjustment and mold design and processing.

Design example:

No. Type Radius Interval (Thickness) Optical Material Diameter Circle Cone Coefficient

1 Aspheric 7 0.6 PMMA 5.568 -6

2 Aspherical 1.3 1.43 3.14 -0.6193934

3 Aspherical -20 0.8 PMMA 3.096 45

4 Aspheric 1.2 0.071 1.682 -2.151186

5 Aspheric 2 1.16 PC 1.522 0.3169257

6 Aspherical 14 0.093 1.054 90

7 Aperture Infinity 0.058 1.306826 0

8 Aspheric 7.48151 1 PMMA 1.168 135

9 Aspherical -1.2 0.1 1.99 -0.3925753

10 Standard Infinity 0.3 K9 1.918661 0

11 Standard Infinity 2.7 2.005836 0

12 Standard Infinity 0.4 K9 3.890846 0

13 Standard Infinity 0.05 4.141398 0

Aspheric Surface Coefficient

Side 1:

Coefficient 2: 0

Coefficient 4: 0.012122036

Coefficient 6: -0.0007779814

Coefficient 8: -4.586116e-005

Factor 10: 6.782423e-006

Factor 12: 0

Factor 14: 0

Factor 16: 0

Side 2: EVENASPH

Coefficient 2: 0

Coefficient 4: -0.003164936

Coefficient 6: 0.01672424

Coefficient 8: -0.001256694

Coefficient 10: -0.0031619364

Factor 12: 0

Factor 14: 0

Factor 16: 0

Side 3:

Coefficient 2: 0

Coefficient 4: -0.008811447

Coefficient 6: -0.006245692

Coefficient 8: 0.0009056553

Coefficient 10: 0.00060505

Factor 12: 0

Factor 14: 0

Factor 16: 0

Side 4:

Coefficient 2: 0

Coefficient 4: 0.19309118

Coefficient 6: -0.0658172

Coefficient 8: -0.21396205

Coefficient 10: -0.29119433

Factor 12: 0

Factor 14: 0

Factor 16: 0

Face 5:

Coefficient 2: 0

Coefficient 4: 0.0203221

Coefficient 6: -0.0042487

Coefficient 8: -0.15060459

Coefficient 10: -0.28382886

Coefficient 12: 0.0022979714

Factor 14: 0

Factor 16: 0

Noodle 6

Coefficient 2: 0

Coefficient 4: 0.06853734

Coefficient 6: 0.60105972

Coefficient 8: -0.12904987

Factor 10: -5.0603828

Factor 12: 15.077425

Factor 14: 0

Factor 16: 0

Noodle 8

Coefficient 2: 0

Coefficient 4: -0.03931131

Coefficient 6: -0.07185864

Coefficient 8: 1.0158389

Coefficient 10: 0.07768973

Coefficient 12: -4.489426

Factor 14: 0

Factor 16: 0

face 9

Coefficient 2: 0

Coefficient 4: 0.038780933

Coefficient 6: 0.00652536

Coefficient 8: 0.0169406

Coefficient 10: -0.0411658

Coefficient 12: 0.03614294

Factor 14: 0

Factor 16: 0.

Claims (6)

1. The high positioning accuracy and ultra-thin optical lens of the all-plastic aspheric lens structure is characterized in that it includes a high-temperature-resistant seat (1), a lens barrel (2) mounted on the high-temperature-resistant seat (1), and a focus ring ( 3), a diaphragm (4) is arranged at the front end of the lens barrel (2), and a first lens (5) and a second lens (6) are sequentially arranged in the cavity of the lens barrel (2) behind the diaphragm (4). ), the third lens (7) and the fourth lens (8), between the first lens (5) and the second lens (6), between the second lens (6) and the third lens (7), the third A spacer (9) is correspondingly provided between the lens (7) and the fourth lens (8); the two surfaces of the first lens (5) are meniscus-shaped aspheric surfaces, and the second lens (6) The two surfaces of the lens are biconcave aspherical surfaces, the third lens (7) is a biconvex aspheric surface, and the fourth lens (8) is a hyperbolic aspheric surface. 2. the high positioning accuracy and the ultra-thin optical lens of all-plastic aspherical lens structure according to claim 1, it is characterized in that the aspheric surface shape of described second lens and the 3rd lens satisfies following equation: Z＝cy ² /{1+√[1-(1+k)c ² y ² ]}+α ₁ y ² +α ₂ y ⁴ +α ₃ y ⁶ +α ₄ y ⁸ +α ₅ y ¹⁰ +α ₆ y ¹² +α ₇ y ¹⁴ +α ₈ y ¹⁶ ; in the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, k is the conic conic coefficient, and α ₁ to α ₈ respectively represent the The coefficient corresponding to the coordinate. 3. according to claim 1 or 2, the high positioning accuracy and ultra-thin optical lens of all-plastic aspherical lens structure, it is characterized in that described first lens (5), second lens (6), the 3rd lens ( 7), the system element characteristics of the fourth lens (8) satisfy the following expressions: -5<f1<-2, -3<f2<-1.5, 1<f3<5, 1<f4<5; 50<vd12< 60, 50<vd34<60, 20<vd56<40, 50<vd89<60; wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the fourth The focal length of the lens, Vd12 is the dispersion coefficient of the first lens, Vd34 is the dispersion coefficient of the second lens, Vd56 is the dispersion coefficient of the third lens, and Vd89 is the dispersion coefficient of the fourth lens. 4. The high positioning accuracy and ultra-thin optical lens of the all-plastic aspherical lens structure according to claim 1 or 2, characterized in that the first surface (51) of the first lens (5) towards the diaphragm direction is an ellipse Aspherical shape, the second surface (52) is an oblate ellipsoid; the first surface (61) of the second lens (6) toward the first lens direction is non-parabolic, and the second surface (62) is a hyperbolic shape; The first surface (71) of the three lenses (7) toward the second lens direction is an ellipsoidal surface, and the second surface (72) is an ellipsoidal surface; the first surface (81) of the fourth lens (8) toward the third lens direction is The flat ellipsoid, the second surface (82) is a hyperbolic shape. 5. according to claim 1 or 2 described high positioning accuracy and ultra-thin optical lens of all-plastic aspherical lens structure, it is characterized in that in the cavity of lens barrel (2), the rear portion of the fourth lens (8) is also provided with There are filters (10). 6. The high positioning accuracy and ultra-thin optical lens of the all-plastic aspheric lens structure according to claim 1 or 2, characterized in that the high temperature resistant seat (1) and the lens barrel (2) pass through the focusing ring (3 ) between the thread fit fixed.

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