CN201017093Y - High-image-quality optical lens with all-plastic aspheric lens structure - Google Patents

Abstract

The utility model relates to a high image quality optical lens with a full plastic non-spherical lens structure, which is applied to a micro optical lens of a high pixel mobile phone and a high image quality camera; the utility model aims at overcoming the prior art not enough, and provide a high pixel, small, can be used to the all-plastic aspheric surface lens structure's of digital camera and cell-phone high image quality optical lens. A high image quality optical lens with a full plastic aspheric lens structure comprises a lens barrel and a bearing seat, wherein the front end of the lens barrel is provided with a diaphragm, and a first lens, a second lens and a third lens are respectively arranged behind the diaphragm; the first lens is a meniscus aspheric lens, and the sections of the second lens and the third lens are hyperbolic aspheric surfaces; the utility model discloses mainly be applied to in the aspect of the camera phone.

Description

A high-quality optical lens with an all-plastic aspheric lens structure

【Technical field】

The utility model relates to an optical lens, in particular to a high-image-quality optical lens with an all-plastic aspheric lens structure used in micro-optical lenses of high-pixel mobile phones and high-image-quality cameras.

【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 General appreciation is far from being enough to print exquisite photos; and the digital lens for camera phones is too large in shape, with an outer diameter 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. In the hand, it is very difficult to obtain advanced products. At the same time, the lens used for CCD photosensitive film is relatively long, and the total length of the optical system is greater than 8mm, which is relatively large when used in a built-in camera phone.

In order to solve the above-mentioned existing shortcomings, the utility model makes a lot of improvements.

【Content of utility model】

The utility model overcomes the shortcomings of the prior art and provides a high-pixel, small-volume, high-image-quality optical lens with an all-plastic aspherical lens structure that can be used in digital cameras and mobile phones.

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

A high-image-quality optical lens with an all-plastic aspheric lens structure, including a lens barrel and a seat, a diaphragm is arranged at the front end of the lens barrel, and a first lens, a second lens, and a third lens are respectively arranged behind the diaphragm ; It is characterized in that: the first lens is a meniscus aspheric lens, and the cross-sections of the second lens and the third lens are all hyperbolic aspheric surfaces;

The above-mentioned high-quality optical lens with an all-plastic aspheric lens structure is characterized in that: the first surface of the first lens is an elliptical aspherical shape, and the second surface is an oblate ellipsoidal surface;

The above-mentioned high-quality optical lens with an all-plastic aspheric lens structure is characterized in that: ring-shaped light-shielding papers that can eliminate stray light are respectively provided on the contact surfaces of the first lens and the second lens ;

A high-quality optical lens with an all-plastic aspheric lens structure as described above is 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 _8y16 ^;

The above-mentioned high-quality optical lens with an all-plastic aspheric lens structure 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;

The above-mentioned high-quality optical lens with an all-plastic aspheric lens structure is characterized in that: a spacer ring for ensuring the distance between the lenses is arranged between the contact surface of the second lens and the third lens ;

A high image quality optical lens with an all-plastic aspheric lens structure as described above is characterized in that: in the cavity formed by the lens barrel and the seat, a filter is also arranged at the rear of the third lens , the filter is fixed on the holder;

A high-image-quality optical lens with an all-plastic aspheric lens structure as described above is characterized in that: the lens barrel is threadedly connected to the seat;

The above-mentioned high-quality optical lens with an all-plastic aspheric lens structure is characterized in that: the material of the lens barrel, the seat, the first lens, the second lens and the third lens is plastic.

Compared with the prior art, the utility model has the following advantages: 1, the digital lens of the utility model can reach more than 2 million pixels, while the existing miniature digital lens is generally 100,000, 300,000 pixels; 2, the utility model The illuminance image surface is uniform and bright as a whole, while most of the existing micro-digital lenses are bright in the center and dark around; 3. The utility model has high sharpness, clear colors, and good color reproduction; 4. The utility model can be used for 3 million pixels 5. This utility model also solves the problems of low yield rate and relatively high cost caused by the difficulty in processing glass lenses in the previous glass-plastic hybrid structure; 6. The most important thing is that this system uses all-plastic material, so the cost has been greatly reduced, allowing the product to enter the market more widely, and the seat is processed with special materials, which can be used for high temperature resistant new module processing.

【Description of drawings】

Fig. 1 is a sectional view of the utility model;

Fig. 2 is a perspective view of the utility model with the base removed.

【Detailed ways】

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

A high-quality optical lens with an all-plastic aspheric lens structure, including a lens barrel 1 and a seat 2, the seat 2 is fitted on the lens barrel 1 by threaded connection, and a light is arranged at the front end of the lens barrel 1. Diaphragm 3, the diaphragm 3 is located at the front of the optical system, it can minimize the aperture of the lens of the system, thereby making the volume of the optical system miniaturized. The first lens 4, the second lens 5, and the third lens 6 are successively arranged at the back of the diaphragm 3; the first lens 4 is an aspheric lens of a meniscus, and the first surface of the first lens 4 is an ellipse Aspherical shape, the second surface is an oblate ellipsoid. The first surface of the second lens 5 and the third lens 6 is a hyperbolic aspheric surface, and the second surface must also be a hyperbolic aspheric surface, which can effectively reduce the field curvature. The lens 6 effectively solves various aberration equalization 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-sided surface of the third lens 6 is designed as a hyperbolic aspheric surface. On the contact surface of the first lens 4 and the second lens 5, there is an annular light-shielding paper 8 that can eliminate stray light, so as to minimize the distortion of imaging. A spacer 10 is provided between the contact surfaces of the second lens 5 and the third lens 6 to ensure the distance between the lenses.

In the cavity formed by the lens barrel 1 and the seat 2, a filter 9 is also provided at the rear of the third lens 6, and the filter 9 is fixed on the seat. It is the 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 problem of color, the optical filter 9 also ensures the smooth progress of the encapsulation process of the following models.

The aspherical surface shapes of the second lens 5 and the third lens 6 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 the radial coordinate (the The unit is the same as the lens length unit), and k is the conic conic coefficient. 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 aspheric surfaces on the front and rear sides 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 its coefficient k should be greater than 1 ; The first aspheric surface and the second aspherical surface of the second lens 5 and the third lens 6 are both hyperbolic in shape, and their 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 expressions: -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 and third lenses 5 and 6, vd23P is the dispersion coefficient of the positive lens in the second and third lens groups 5 and 6, and vd23N is the negative lens in the second and third lens groups 5 and 6 dispersion coefficient.

The first lens 4 of the system has a positive refractive power, the second lens 5 has a negative refractive power, the third lens 6 has a positive refractive power, and the combination of the second lens 5 and the third lens 6 has a negative refractive power, so that the optical system The main aspect of the image is moved forward, so that the length of the system is shortened.

Because the combination of the lens barrel 1, the seat 2, the first lens 4, the second lens 5 and the third lens 6 is very compact, the outer diameters of the lenses are all less than 8 mm or more, which solves the existing problem of relatively large outer diameters ; Again, the utility model is all made of plastic, so the cost is greatly reduced, and the product can be more widely entered into the market, and the seat 2 is processed with special materials, which can be used for high temperature resistant new module processing, Because the utility model adopts the combination between the lens ingeniously, its digital lens can reach more than 2,000,000 pixels, small and exquisite and practical.

Claims (9)

1. A high image quality optical lens of an all-plastic aspherical lens structure, comprising a lens barrel (1) and a seat (2), the front end of the lens barrel (1) is provided with a diaphragm (3), and the diaphragm ( 3) the first lens (4), the second lens (5), and the third lens (6) are arranged respectively in the back; it is characterized in that: the first lens (4) is an aspherical lens of meniscus, and the The cross-sections of the second lens (5) and the third lens (6) are both hyperbolic aspheric surfaces. 2. the high image quality optical lens of a kind of all-plastic aspherical lens structure according to claim 1, is characterized in that: the first face of described first lens (4) is ellipse aspherical shape, and the second face is an oblate ellipsoid. 3. The high image quality optical lens of a kind of all-plastic aspheric lens structure according to claim 2, is characterized in that: on the contact surface of described first lens (4) and second lens (5), respectively An annular shading paper (8) that can eliminate stray light is provided. 4. according to claim 1 or 2 described a kind of high image quality optical lens of all-plastic aspheric lens structure, it is characterized in that: the surface shape of the aspheric surface of second lens (5), the 3rd lens (6) 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 . 5. The high image quality optical lens of a kind of all plastic aspheric lens structure according to claim 1 or 2, is characterized in that: first lens (4), second lens (5), third lens (6) The characteristics of the system components satisfy the following expression: -0.4<f1/f234<0, vd234P-vd234N>30mm. 6. The high image quality optical lens of a kind of all-plastic aspheric lens structure according to claim 2, is characterized in that: set between the contact surface of the second lens (5) and the third lens (6) There are spacers (10) for securing the distance between the lenses. 7. The high image quality optical lens of a kind of all plastic aspheric lens structure according to claim 1, is characterized in that: in the cavity that described lens barrel (1) and seat (2) form, the first The rear portion of the three lenses (6) is also provided with an optical filter (9), and the optical filter (9) is fixed on the seat. 8. A high-quality optical lens with an all-plastic aspherical lens structure according to claim 1, characterized in that: the lens barrel (1) is screwed to the seat (2). 9. according to claim 1 or 2 or 3 or 6 or 7 or 8 described a kind of high image quality optical lens of all-plastic aspherical lens structure, it is characterized in that: described lens barrel (1), seat ( 2), the material of the first lens (4), the second lens (5) and the third lens (6) is plastic.

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