CN202916488U - A High Image Quality Miniature Aspherical Optical Lens with Hybrid Lens Structure - Google Patents

Abstract

The utility model relates to a high image quality miniature aspheric surface optical lens of hybrid lens structure. The utility model discloses it is not enough to aim at overcoming prior art, and provides a high pixel, small, can use in the miniature aspheric surface optical lens of high image quality of the mixed lens structure of digital camera and cell-phone. The lens barrel is internally provided with a first lens, a second lens, a third lens and a fourth lens from outside to inside; the first lens is a biconvex aspheric lens; the section of the second lens is a meniscus spherical surface; the section of the third lens is a hyperbolic aspheric surface; the section of the fourth lens is a hyperbolic-shaped aspheric surface. The utility model discloses mainly be applied to in the aspect of the camera phone.

Description

A High Image Quality Miniature Aspherical Optical Lens with Hybrid Lens Structure

【Technical field】

The utility model relates to an optical lens, in particular to a high-image-quality miniature aspherical optical lens with a hybrid lens structure applied to the micro-optical lens of a high-pixel mobile phone and a high-image-quality camera.

【Background technique】

Currently used cameras and mobile phone digital lenses generally have such shortcomings: relatively low pixels and large external dimensions. The current mainstream camera phones in the market are mainly 100,000 and 300,000-pixel low-profile lenses. The image quality of the captured images is not ideal in terms of overall clarity or uniformity of illumination, and can only be used as a standby screen or Appreciation in general is far from satisfying to print beautiful photos.

In addition, the digital lens for camera phones is relatively large in shape, and the outer diameter is generally greater than 8mm, and the use of high-pixel chips is limited to the use of CCD photosensitive sheets, and CCD photosensitive technology is controlled by Japanese manufacturers. It is very difficult to obtain advanced products. The lens of the CCD photosensitive film is relatively long, and the total length of the optical system is greater than 8mm, and it appears to be bulky when used on a built-in camera phone.

In order to solve the above-mentioned existing problems, the utility model makes beneficial improvements.

【Content of utility model】

The utility model overcomes the deficiencies of the prior art, and provides a high-pixel, small-volume, high-image-quality miniature aspheric optical lens that can be used in a hybrid lens structure of a digital camera and a mobile phone.

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

A high-image-quality micro-aspherical optical lens with a hybrid lens structure, including a lens barrel, a seat and a diaphragm, and a first lens, a second lens, a third lens, and a fourth lens are respectively arranged in the lens barrel from outside to inside. Lens; it is characterized in that: the first lens is a biconvex aspheric lens, the second lens has a meniscus spherical surface in section, and the third lens has a hyperbolic aspheric section in section, The section of the fourth lens is a hyperbolic aspheric surface;

A high-image-quality micro-aspheric optical lens with a hybrid lens structure as described above is characterized in that: the contact surfaces of the first lens, the second lens, the third lens, and the fourth lens adjacent to the lens are respectively provided with There is a ring-shaped shading paper that can eliminate stray light;

A high-image-quality micro-aspherical optical lens with a hybrid lens structure as described above is characterized in that: the first surface of the first lens is an elliptical aspheric surface, and the second surface is an oblate ellipsoidal surface;

A kind of high-image-quality miniature aspheric optical lens with a hybrid lens structure as described above is characterized in that: the surface shapes of the aspheric surfaces of the first lens, the third lens, and the fourth 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 ;

A high-quality micro-aspherical optical lens with a hybrid lens structure as described above is characterized in that: the system element characteristics of the first lens, the second lens, and the third lens satisfy the following expression: -0.4<f1/f234< 0, vd234P-vd234N>30mm;

A high-quality micro-aspheric optical lens with a hybrid lens structure as described above is characterized in that: a spacer for ensuring the distance between the lenses is provided between the bottom of the third lens and the contact surface of the fourth lens ;

The high-image-quality miniature aspherical optical lens with a hybrid lens structure as described above is characterized in that: in the cavity of the lens barrel and the seat, a filter is also provided at the rear of the fourth lens, The filter is fixed on the holder.

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

1. The digital lens of the present utility model can reach more than 3 million pixels, while the existing miniature digital lens generally has 100,000 or 300,000 pixels;

2. The illuminance image surface of the utility model is uniform and bright as a whole, while most of the existing miniature digital lenses are bright in the center and dark around;

3. The utility model has high sharpness, distinct colors, and good color reproduction;

4. The utility model can be used for CMOS photosensitive film with 3 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 glass lens in the previous glass-plastic hybrid structure.

【Description of drawings】

Fig. 1 is the front view of the utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is a perspective view of the utility model.

【Detailed ways】

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

A high-image-quality miniature aspherical optical lens with a hybrid lens structure, comprising a lens barrel 1 and a seat 2, the front end of the lens barrel 1 is provided with an aperture 3, and the aperture 3 is located at the forefront of the optical system, which can make the system The optical aperture of the lens is the smallest, thus making the volume of the optical system miniaturized. After the diaphragm 3, in the cavity of the lens barrel 1, a first lens 4, a second lens 5, a third lens 6, and a fourth lens 7 are arranged in sequence. The first lens 4 is a biconvex aspheric lens, the upper surface of the first lens 4 is an elliptical aspherical shape, and the lower surface is an oblate ellipsoid. The surface of the second lens 5 is in the shape of a meniscus spherical surface, and it has high refractive power. Due to its position in the optical system and high refractive index, it is possible to design a larger outer diameter.

This is different from the general structure where the glass spherical lens is placed at the front of the optical system, because considering the conflicting process of glass lens processing and assembly, the utility model adopts the reasonable distribution of front and rear aspheric aberrations and the aberration of the same glass lens. The ingenious balance of the third lens 6 solves the previous process problem; the upper surface of the third lens 6 is a hyperbolic aspheric surface, and the lower surface must be a hyperbolic aspheric surface, which can effectively reduce the curvature of field. The fourth lens The surface of 7 is a hyperbolic aspheric surface, and the cooperation of the third and fourth lenses 6 and 7 effectively solves various aberration balancing problems.

In order to reduce the refraction change angle of light between the lenses and control imaging distortion, it is necessary to reduce the distance between the first lens 4 and the second lens 5 structurally; at the same time, the distance between the second lens 5 and the third lens 6 The distance needs to be increased as much as possible; in order to improve the field curvature aberration, the double sides of the third lens 6 are designed as hyperbolic aspheric surfaces. The contact surfaces of adjacent lenses of the first lens 4, the second lens 5, the third lens 6, and the fourth lens 7 are respectively provided with annular light-shielding paper 8 that can eliminate stray light, so as to minimize the loss of imaging. distortion. A spacer 10 for ensuring the distance between the lenses is provided between the contact surface of the light-shielding paper 8 below the third lens 6 and the fourth lens 7 .

In the cavity of the lens barrel 1 and the seat 2, the rear portion of the fourth lens 7 is also provided with a filter 9, and the filter 9 is fixed on the seat, and the bottom of the filter 9 is CMOS photosensitive chip, the light enters from the filter 9, the filter 9 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 it has good color reproduction. In addition to solving the color problem, the optical filter 9 also ensures the smooth progress of the subsequent packaging process.

The aspherical surface shapes of the first lens 4, the third lens 6, and the fourth lens 7 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, and y is Radial coordinate (its unit is the same as the lens length unit), k is the coefficient of the conic conic curve. 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. α ₁ to α ₈ represent the coefficients corresponding to the radial coordinates respectively. Through the above parameters, the shape and size of the front and rear aspheric surfaces of the lens can be precisely set. In the utility model, the first surface of the first lens 4 is an elliptical aspherical shape, and the k coefficient is required to be between -1∽0, and the second aspheric surface is an oblate elliptical surface, and the range of the coefficient k should be greater than 1 ; The first aspheric surface and the second aspherical shape of the third lens 6 are all hyperbolic, and their k coefficients are all less than -1; the first aspheric surface and the second aspheric shape of the fourth lens 7 are all It is hyperbolic, and its k coefficients are all less than -1.

The system component characteristics of the first lens 4, the second lens 5, and the third lens 6 satisfy the following expression: -0.4<f1/f234<0, vd234P-vd234N>30mm, where f1 is the focal length of the first lens 4, and f234 is the combined focal length of the second, third, and fourth lenses 5, 6, and 7, vd23P is the dispersion coefficient of the positive lens in the second, third, and third lens groups 5, 6, and vd23N is the value of the negative lens in the second, third lens 5, and 6 groups Dispersion coefficient.

The first lens 4 of the system has positive refractive power, the second lens 5 has negative refractive power, the third and fourth lenses 6, 7 have positive refractive power, the combination of the second lens 5, the third lens 6 and the fourth lens 7 It 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.

Claims (3)

1. A high-image-quality micro-aspherical optical lens with a hybrid lens structure, including a lens barrel (1), a seat (2) and a diaphragm (3). The first lens (4), the second lens (5), the third lens (6), and the fourth lens (7); it is characterized in that: the first lens (4) is a biconvex aspheric lens, so The cross-section of the second lens (5) is a meniscus spherical surface, the cross-section of the third lens (6) is a hyperbolic aspheric surface, and the cross-section of the fourth lens (7) is a hyperbolic shape aspherical surface; the first lens (4), the second lens (5), the third lens (6), the fourth lens (7) are respectively provided with ring-shaped lens on the contact surface of the adjacent lens, which can eliminate stray light shading paper (8); the first surface of the first lens (4) is an elliptical aspherical surface, and the second surface is an oblate ellipsoidal surface; the first lens (4), the second lens (5), the second The system component characteristics of the three lenses (6) satisfy the following expression: -0.4<f1/f234<0, vd234P-vd234N>30mm; between the bottom of the third lens (6) and the contact surface of the fourth lens (7) A spacer (10) for ensuring the distance between the lenses is provided. 2. A high-image-quality micro-aspherical optical lens with a hybrid lens structure according to claim 1, characterized in that: the aspheric lens of the first lens (4), the third lens (6), and the fourth lens (7) The surface shape of a sphere satisfies 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 . 3. A high-image-quality micro-aspherical optical lens with a hybrid lens structure according to claim 1, characterized in that: in the cavity of the lens barrel (1) and the seat (2), the fourth A filter (9) is also provided at the rear of the lens (7), and the filter (9) is fixed on the seat.

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