CN211528804U - Optical system and mobile phone camera module adopting same - Google Patents

Abstract

The utility model discloses an optical system and a mobile phone camera module adopting the optical system, the optical system is a five-piece type aspheric structure, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged from the object side to the image side in sequence, the first lens is a convex lens, the second lens is a concave lens, the third lens, the fourth lens and the fifth lens are sigmoidal curved lenses, because of the special design of the aspheric contour shape of the optical system and the reasonable arrangement of the refractive index of each piece of material, the large image field and the high pixel design requirement of the diagonal length H of the image plane of the optical system between 7.80mm and 10.50mm are reached, thereby the integral brightness of the optical system is increased, the production cost is reduced, the mobile phone camera module adopting the optical system adopts a deformed elastomer embedded positioning structure, the stability of the image resolution is guaranteed, and the assembly yield of the camera module is improved.

Description

An optical system and a mobile phone camera module using the optical system

technical field

The utility model relates to the technical field of mobile phone camera modules, in particular to an optical system and a mobile phone camera module using the optical system.

Background technique

The existing mobile phone camera modules with more than 40 million pixels are all camera modules with a large field of view. The area of the sensor is relatively large, generally a color CMOS sensor larger than 1/2.5”. In order to improve the image quality, most of the production Manufacturers of camera modules generally design the camera lens into a six-piece structure with six aspherical surfaces or a structure with more than seven aspherical surfaces. In this way, various aberrations can be corrected better, which determines the camera module. A clear modulation transfer function (MTF) can meet the design requirements.

The common problem of the existing large field of view mobile phone camera modules with more than 40 million pixels is: due to the large number of plastic lenses, the transmittance of the overall camera module will be relatively poor, because the transmittance of each plastic lens Below 95%, after six or seven plastic lenses are combined, the transmittance of the entire camera module is less than 75%, and the light transmitted by the entire camera module is relatively dark. The surfaces are all aspherical, which makes them particularly sensitive to assembly tolerances. Any tilt, eccentricity, air spacing and thickness errors caused by lens assembly, as well as shrinkage errors, surface errors or Yass caused by the injection molding of the lens itself, will be directly This results in ghosting or blurring of the camera module, resulting in a low yield of optical lenses.

There are existing mobile phone camera modules with a large field of view of more than 40 million pixels. Figure 1 shows the structure of a traditional six-piece mobile phone camera module. The structure of a traditional six-piece mobile phone camera module is generally as follows: the front four lenses are generally Alternately use high and low refractive index material components, and the last two mirrors use low refractive index, high dispersion coefficient material components, namely its first mirror 100, third mirror 300, fifth mirror 500 and sixth mirror 600, generally Optical plastic material components with low refractive index and high dispersion coefficient are used. Generally, the refractive index nd is less than 1.59, and the dispersion coefficient vd is greater than 55. The second lens 200 and the fourth lens 400 are usually optical with high refractive index and low dispersion coefficient. Plastic material components generally have a refractive index nd greater than 1.60 and a dispersion coefficient vd less than 30. For the assembly between lenses, where the gap is relatively thin, black light-absorbing Mylars are generally used for spacing. For example, a first Mylar 700 is installed between the flanges of the first lens 100 and the second lens 200. A second mylar 800 is installed between the flanges of the second lens 200 and the third lens 300 , and a third mylar 900 is installed between the third lens 300 and the flange of the fourth lens 400 . For thicker positions, a black light-absorbing spacer is used for separation. For example, a first spacer 1000 is installed between the flanges of the fourth lens 400 and the fifth lens 500, and the fifth lens 500 and the sixth lens 600 A second spacer 1100 is installed between the flanges of the lens to eliminate stray light generated by the flange of the lens.

This structure is a commonly used structure for mobile phone camera modules with a large field of view of more than 40 million pixels on the market. It can obtain relatively clear images, but since all lenses are plastic or glass aspherical, its sensitivity is relatively high. , When assembling, the requirements for eccentricity and inclination, and other assembly tolerances are particularly strict. The positioning and mutual nesting between the lenses are generally controlled by a step inclined 20°-30° set on the flange edge of the lens, such as the first step 110, the second step 210 and the The third step 310 is matched. The accuracy of the step has a crucial impact on the assembly accuracy of the lens. Since the lens is a hard plastic component, there will be some shrinkage, burr and draft angle error when the lens is injection molded, which will directly affect the accuracy of the step on the flange edge. When the mating contact surfaces of the two lenses are in an interference fit state, because they are in a hard contact state, it is easy to fail to install in the set position, which will cause one of the lenses to be tilted or the air gap between the two to become larger, reducing imaging. The resolution capability is low, the production yield is low, the production cost increases and the quality decreases.

Utility model content

The purpose of the present utility model is to overcome the above-mentioned defects in the prior art, and to provide a large image field, a high image field, and a high image field with a diagonal length H between 7.80mm-10.50mm of the optical system using only five lenses. Pixel design requirements, a large field of view, a high-pixel optical system that reduces production costs, a deformed elastomer fitting and positioning structure, and a mobile phone camera module using the optical system.

In order to achieve the above purpose, the present invention provides an optical system, the optical system is a five-piece aspherical structure, including a first lens, a second lens, a third lens, a first lens, a second lens, a third lens, a Four mirrors and a fifth mirror, the first mirror is a convex lens, the second mirror is a concave lens, the third mirror, the fourth mirror and the fifth mirror are inverse curved curved lenses, the second mirror and the third mirror are refractive an optical material component with a ratio nd between 1.62-1.80 and a dispersion coefficient vd less than 35, the first lens is an optical material component with a refractive index nd less than 1.60 and a dispersion coefficient vd greater than 20, the fourth lens and the fifth lens The lens is an optical material component with a refractive index nd between 1.50-1.80 and a dispersion coefficient vd between 20-70, the third lens has a second curved surface of the third lens, and the second lens of the third lens has a second curved surface. The bending direction of the middle concave part of the surface profile of the curved surface is opposite to the bending direction of the outer visual field edge, and the edge chief ray angle θ between the third lens and the fourth lens is between 59° and 75°, The diagonal length H of the image plane of the optical system is between 7.80mm-10.50mm.

Preferably, the first lens has a first surface of the first lens, and the curvature radius of the first surface of the first lens is between 1.2 mm and 1.85 mm.

Preferably, the half-field angle α of the optical system is between 20° and 85°.

Preferably, the total optical length L of the optical system is between 4.2mm-7.5mm.

Preferably, the total number of pixels on the image plane of the optical system is more than 40 million pixels.

Preferably, the first lens, the second lens, the third lens, the fourth lens and the fifth lens of the optical system are optical resin material components, liquid silicone material components, glass material components, quartz components, sapphire material components or Transparent opto-ceramic material components.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model is provided with an optical system, the optical system is a five-piece aspherical structure, including a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in sequence from the object side to the image side, The first mirror is a convex lens, the second mirror is a concave lens, the third mirror, the fourth mirror and the fifth mirror are inverse curved surface lenses, and the second mirror and the third mirror have a refractive index nd between 1.62-1.80 between the optical material components with the dispersion coefficient vd less than 35, the first mirror is an optical material component with the refractive index nd less than 1.60 and the dispersion coefficient vd greater than 20, the fourth mirror and the fifth mirror are the refractive index nd between An optical material component with a dispersion coefficient vd between 1.50 and 1.80 and a dispersion coefficient vd between 20 and 70, the edge chief ray angle θ between the third lens and the fourth lens is between 59° and 75°, and the The diagonal length H of the image plane of the optical system is between 7.80mm-10.50mm. Since the second lens and the third lens are optical material components with a refractive index nd between 1.62-1.80 and a dispersion coefficient vd less than 35, Due to the special design of the aspherical contour shape of the optical system and the reasonable setting of the refractive index of each lens material, the edge chief ray angle θ between the third lens and the fourth lens is realized between 59° and 75°. , to provide a large angle that extends to the chief ray and edge chief ray of each field of view off-axis at a large angle to achieve a large image field and a high pixel with a diagonal length H between 7.80mm-10.50mm of the optical system. The design requirements make the total optical length L of the optical system further shortened, and the number of at least one lens is reduced compared with the prior art, and only five lenses are required. Due to the reduction in the number of lenses, the light transmittance of the optical system is improved, so that the optical system The overall brightness is improved and the production cost of the optical system is reduced.

The utility model also provides a mobile phone camera module, which includes a casing, and an optical system installed in the casing. An infrared cut-off filter is installed at the rear of the optical system. The part is provided with an image sensor, and the optical system is provided with at least one deformed elastic body fitting and positioning structure.

Preferably, the deformed elastic body fitting and positioning structure comprises a deformed first elastic body installed on the flange of the first lens, and a deformed second elastic body installed on the flange of the second lens. an elastic body, the flange edge of the second lens is provided with a first fitting and positioning groove of the first elastic body that is deformed, the first elastic body is closely matched with the first fitting and positioning groove, and the third lens is The flange edge of the device is provided with a second fitting and positioning groove for a deformed second elastic body, and the second elastic body is closely matched with the second fitting and positioning groove.

Preferably, the first elastic body and the second elastic body are hump-shaped structures with bulges on both sides and concave in the middle. The convex cross-sectional contour of the hump-shaped structure is that the two outer sides are straight lines or arc curves with a slope, and the middle is a transition arc connection. The first fitting positioning groove and the second fitting The combined positioning groove is a concave positioning groove structure, and the cross-sectional profile of the internal concave positioning groove structure is an inverted trapezoid, a V-shaped or a U-shaped shape, and the hump-shaped structure and the concave positioning groove structure are correspondingly arranged. The hump-shaped structure The order in which the concave positioning groove structures are arranged is that one side is a hump-shaped structure, the other side is a concave positioning groove structure, or one side is a concave positioning groove structure, and the other side is a hump-shaped structure.

Preferably, the first elastomer and the first lens are a single-piece plastic component made of the same material or a double-material integrated plastic component of different materials for the first elastomer and the first lens, and the second elastomer and the The two lenses are a single-piece plastic component of the same material or a double-material integrated plastic component in which the second elastomer and the second lens are made of different materials.

Preferably, the first elastic body and the first lens are made of the same material, the first elastic body and the first lens are formed at one time, and the second elastic body and the second lens are made of the same material, so The second elastomer and the second lens are formed at one time.

Preferably, the first elastic body and the first lens are made of different material components, the first elastic body is a flexible liquid silicone component or a silicone rubber component, and the second elastic body and the second lens are made of different material components , the second elastic body is a flexible liquid silicone component or a silicone rubber component, and the first elastic body and the second elastic body are formed by double-material molding, in-mold inlay molding or injection molding and then 3D printing silicone molding.

Preferably, a first Mylar is installed between the flanges of the first lens and the second lens, and a second Mylar is installed between the flanges of the second lens and the third lens A third Mylar plate is installed between the flanges of the third lens and the fourth lens, and a spacer is installed between the flanges of the fourth lens and the fifth lens.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model is provided with at least one deformed elastic body fitting and positioning structure. During the assembly process of the elastic body, because the concave positioning groove structure has a space for avoidance or the elastic body with a concave hump-shaped structure on both sides of the convex center Appropriate deformation along the radial and axial directions automatically optimizes the stability of the fitting between the front and rear lenses. When the two lenses are in an interference fit state, the fitting positioning structure with deformed elastic body has The function of automatically balancing the assembly degree of cooperation between the lenses allows the front and rear lenses to have a certain space for avoidance and elasticity when they cooperate with each other. The abnormal problem of lens tilt or excessive air gap occurs. The eccentricity error, inclination error and thickness error introduced during lens assembly are controlled to a minimum by adjusting the elastic body and the avoidance space, so that the gap between the lens and the lens can be minimized. The concentricity of the assembly can achieve precise positioning with a tolerance of less than ±0.0015mm, thereby improving the assembly quality of the camera module, ensuring the stability of the shooting resolution, and greatly improving the yield of the camera module assembly.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

1 is a cross-sectional view of a traditional six-piece mobile phone camera module;

2 is a schematic diagram of an exploded structure of an optical system according to an embodiment of the present invention;

3 is a cross-sectional view of an optical system according to an embodiment of the present invention;

4 is a cross-sectional view of a first lens of an optical system according to an embodiment of the present invention;

5 is a cross-sectional view of a second lens of an optical system according to an embodiment of the present invention;

6 is a cross-sectional view of a third lens of an optical system according to an embodiment of the present invention;

7 is a cross-sectional view of a fourth lens of an optical system according to an embodiment of the present invention;

8 is a cross-sectional view of a fifth lens of an optical system according to an embodiment of the present invention;

9 is an optical path diagram of an optical system according to an embodiment of the present invention;

10 is a modulation transfer function of an optical system according to an embodiment of the present invention;

11 is a lattice diagram of an optical system according to an embodiment of the present invention;

12 is an image plane grid diagram of an optical system according to an embodiment of the present invention;

13 is the relative illuminance of an optical system according to an embodiment of the present utility model;

14 is a perspective view of a mobile phone camera module using an optical system according to the second embodiment of the present invention;

15 is an exploded view of a mobile phone camera module using an optical system according to the second embodiment of the present invention;

16 is a cross-sectional view of a mobile phone camera module using an optical system according to the second embodiment of the present invention.

Included in the diagram are:

1-housing, 2-optical system, 3-infrared cut filter, 21-first lens, 22-first mylar lens, 23-second lens, 24-second mylar lens, 25-third lens, 26-third Mylar, 27-fourth lens, 28-spacer, 29-fifth lens, 212-first elastomer, 213-first face of first lens, 214-second of first lens face, 231-first fitting and positioning groove, 232-second elastic body, 233-first face of second lens, 234-second face of second lens, 251-second fitting and positioning groove, 253-th The first side of the three lenses, 254 - the second side of the third lens, 273 - the first side of the fourth lens, 274 - the second side of the fourth lens, 293 - the first side of the fifth lens, 294 - the first side of the fourth lens The second side of the five lenses, 33—the first side of the infrared cut-off filter, 34—the second side of the infrared cutoff filter, 4—the image sensor, and 5—the deformed elastomer fitting and positioning structure.

Detailed ways

The technical solutions in this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment of the present invention. Obviously, the described embodiment is an embodiment of the present invention, and Not all of this embodiment. Based on the present embodiment of the present invention, all other embodiments of the present invention obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1

Please refer to FIG. 2 to FIG. 8 , the present invention provides an optical system, the optical system 2 is a five-piece aspherical structure, including a first lens 21 and a second lens 23 arranged in sequence from the object side to the image side , the third mirror 25, the fourth mirror 27 and the fifth mirror 29, the first mirror 21 is a convex lens, the second mirror 23 is a concave lens, and the third mirror 25, the fourth mirror 27 and the fifth mirror 29 are inverse curved surfaces The lens, the inverse curved curved surface lens, refers to a lens whose middle curved surface is curved in the opposite direction to the edge curved direction. For an optical material component with a coefficient vd less than 35, the second mirror 23 and the third mirror 25 can be optical material components with two different refractive indices or two optical material components with the same refractive index. The lens 21 is an optical material component with a refractive index nd less than 1.60 and a dispersion coefficient vd greater than 20, the fourth lens 27 and the fifth lens 29 are the refractive index nd between 1.50-1.80 and the dispersion coefficient vd between 20-70 Optical material components between, the third lens 25 has a second curved surface 254 of the third lens, the curved direction of the middle concave portion of the surface profile of the second curved surface 254 of the third lens and the edge of the outer field of view The bending direction of the optical system 2 is opposite, the edge chief ray angle θ between the third lens 25 and the fourth lens 27 is between 59° and 75°, and the diagonal length H of the image plane of the optical system 2 is between 7.80 Between mm-10.50mm.

Due to the special design of the aspherical contour shape of the optical system and the reasonable setting of the refractive index of each lens material, the edge chief ray angle θ between the third lens and the fourth lens is realized between 59° and 75°. , to provide a large angle that extends to the chief ray and edge chief ray of each field of view off-axis at a large angle to achieve a large image field and a high pixel with a diagonal length H between 7.80mm-10.50mm of the optical system. The design requirements make the total optical length L of the optical system further shortened, and the number of at least one lens is reduced compared with the prior art, and only five lenses are required. Due to the reduction in the number of lenses, the light transmittance of the optical system is improved, so that the optical system The overall brightness is improved and the production cost of the optical system is reduced.

The first lens 21 has a first surface 213 of the first lens, and the curvature radius of the first surface 213 of the first lens is between 1.2 mm and 1.85 mm.

The half angle of view α of the optical system 2 is between 20° and 85°, and the preferred half angle of view in the first embodiment is 39.3°.

The total optical length L of the optical system 2 is between 4.2mm-7.5mm.

The total number of pixels on the image plane of the optical system 2 is more than 40 million pixels.

The first mirror 21 , the second mirror 23 , the third mirror 25 , the fourth mirror 27 and the fifth mirror 29 of the optical system 2 are optical resin material components, liquid silicone material components, glass material components, quartz components, and sapphire materials. member or transparent opto-ceramic material member.

The optical path parameters of the lens of the optical system 2 in the first embodiment, including the radius of curvature, thickness, refractive index nd, Abbe coefficient Vd, clear aperture, conic coefficient and aspheric coefficient of each surface are shown in Table 1, Table 2 and shown in Table 3.

The first mirror 21 and the fourth mirror 27 are optical material components with low refractive index and high dispersion coefficient, the refractive index nd=1.544502, the dispersion coefficient Vd=55.986991, the first mirror 21 is a convex lens, the The curvature radius R of the first surface 213 of a lens is R=1.687764 mm, and the fifth lens 29 is an inverse curved curved lens, that is, the curved direction of the middle of the curved surface is opposite to the curved direction of the edge.

The second mirror 23 and the third mirror 25 are the same high-refractive-index material, low-dispersion-coefficient optical material, the refractive index nd=1.661319, the Abbe coefficient Vd=20.374576, and the fifth mirror 29 is An optical material member with a high refractive index and a low dispersion coefficient, the refractive index nd=1.650971, and the Abbe coefficient Vd=21.516276.

The thickness d=0.21mm of the infrared cut filter 3, which is a band-pass filter that transmits visible light and blocks infrared light. The first surface 33 of the infrared cut filter and the second surface 34 of the infrared cut filter are both A dielectric film that transmits visible light and blocks infrared light is plated, and the transmittance of the infrared cut-off filter 3 in the 720nm-1100nm band is less than 3%.

Table 1 The optical path parameters of the lens of the optical system in the first embodiment,

Table 2 The aspheric coefficients of the first lens to the third lens of the optical system in the first embodiment:

Table 3 Aspheric coefficients of the fourth lens and fifth lens of the optical system in the first embodiment:

Fig. 9 shows the optical path diagram of the optical system in the first embodiment, and Fig. 10 shows the modulation transfer function (resolution) of the optical system in the first embodiment. In addition, the MTFs of all other fields of view are almost between 0.6-0.8, and the definition is very good. The MTF of the most marginal field of view has also reached nearly 0.5, and the definition has reached a very good target.

FIG. 11 shows a spot diagram of the optical system in the first embodiment, and the root mean square of the spot diagram of the paraxial field of view at the center position is 4.8 μm.

FIG. 12 shows the image plane grid diagram of the optical system in the first embodiment, and it can be seen that the image plane has almost no distortion.

FIG. 13 shows the relative illuminance of the optical system in the first embodiment, and it can be seen that the relative illuminance of the maximum field of view at the edge reaches about 37%.

Embodiment 2

As shown in FIG. 14 to FIG. 16 , the present invention also provides a mobile phone camera module using an optical system, including a housing 1 and an optical system 2 installed in the housing 1 . The optical system 2 An infrared cut filter 3 is installed at the rear, an image sensor 4 is installed at the rear of the infrared cut filter 3, and at least one deformed elastomer fitting and positioning structure 5 is installed on the optical system 2. The number of deformed elastomer fitting and positioning structures 5 in the system 2 may be single, two or more, and preferably two in the second embodiment.

The deformed elastic body fitting and positioning structure 5 includes a deformed first elastic body 212 installed on the flange edge of the first lens 21 , and a deformed second elastic body 212 installed on the flange edge of the second lens 23 . The elastic body 232, the flange edge of the second lens 23 is provided with a first fitting and positioning groove 231 of the deformed first elastic body 212, and the first elastic body 212 is closely matched with the first fitting and positioning groove 231 The flange edge of the third lens 25 is provided with a second fitting and positioning groove 251 of the deformed second elastic body 232 , and the second elastic body 232 is closely matched with the second fitting and positioning groove 251 .

The first elastic body 212 and the second elastic body 232 are hump-shaped structures with convex and concave middle on both sides. Polygonally arranged, the convex cross-sectional profile of the hump-shaped structure is that the two outer sides are straight lines or arc curves with a slope, and the middle is a transition arc connection. The first fitting positioning groove 231 and the second fitting The positioning groove 251 is a concave positioning groove structure. The cross-sectional profile of the concave positioning groove structure is an inverted trapezoid, a V-shape or a U-shape. The hump-shaped structure and the concave positioning groove structure are correspondingly arranged. The order in which the concave positioning groove structures are arranged is that one side is a hump-shaped structure, the other side is a concave positioning groove structure, or one side is a concave positioning groove structure, and the other side is a hump-shaped structure.

The first elastic body 212 and the first lens 21 are single-piece plastic components made of the same material, or the first elastic body 212 and the first lens 21 are two-material integrated plastic components of different materials. The second lens 23 is a single-piece plastic member of the same material or a double-material integrated plastic member of which the second elastic body 232 and the second lens 23 are made of different materials.

The first elastic body 212 and the first lens 21 are made of the same material, the first elastic body 212 and the first lens 21 are formed at one time, and the second elastic body 232 and the second lens 23 are made of the same material , the second elastic body 232 and the second lens 23 are formed at one time, and the production cost can be saved by adopting the one-time forming method.

The first elastic body 212 and the first lens 21 are made of different materials, the first elastic body 212 is a flexible liquid silicone member or a silicone rubber member, and the second elastic body 232 and the second lens 23 are made of different materials The second elastic body 232 is a flexible liquid silicone member or a silicone rubber member, and the first elastic body 212 and the second elastic body 232 are formed by double-material molding, in-mold insert molding or injection molding and then 3D printed with silicone.

In the second embodiment, two deformed elastic body fitting and positioning structures 5 are installed. During the assembly process of the elastic body, the concave positioning groove structure has a space for avoidance or a hump-shaped concave concave in the middle. The elastic body of the structure is properly deformed along the radial and axial directions to automatically optimize the stability of the fitting between the two lenses before and after. The combined positioning structure has the function of automatically balancing the assembly degree of cooperation between the lenses, so that the front and rear lenses have a certain space for avoidance and elasticity when they cooperate with each other. Under the action of the assembly force, the most precise and stable cooperation is automatically achieved. In the assembly process, the abnormal problem of lens inclination or excessive air gap occurs. The eccentricity error, inclination error and thickness error introduced during lens assembly are controlled to the minimum through the coordination adjustment of the elastic body and the avoidance space, so that the lens can be adjusted to a minimum. The concentricity assembled with the lens achieves precise positioning with a tolerance of less than ±0.0015mm, thereby improving the assembly quality of the camera module, ensuring the stability of the shooting resolution, and greatly improving the yield of the camera module assembly.

As shown in FIG. 15 and FIG. 16 , a casing 1 is installed on the outside of the optical system 2 , and an infrared cut filter 3 is installed at the rear of the optical system 2 . The infrared cut filter 3 is transparent to visible light and blocks infrared. The band-pass filter of light, the first surface 33 of the infrared cut filter and the second surface 34 of the infrared cut filter are both coated with a dielectric film that transmits visible light and blocks infrared light, and the infrared cut filter 3 is in the The transmittance of the 720nm-1100nm band is less than 3%, and an image sensor 4 is installed behind the infrared cut filter 3 .

A first microphone 22 is installed between the flanges of the first lens 21 and the second lens 23 , and a second microphone 22 is installed between the flanges of the second lens 23 and the third lens 25 . Pull tab 24, a third mylar 26 is installed between the flanges of the third lens 25 and the fourth lens 27, and between the flanges of the fourth lens 27 and the fifth lens 29 There are spacers 28.

The assembly between the lenses, in the position where the gap between the flanges on the edge of the lens is relatively thin, generally uses black light-absorbing Mylar for spacing, and the position where the gap is relatively thick, uses black light-absorbing spacer to carry out spaced to eliminate stray light from the lens flange position.

The optical system described in the utility model can be used in different fields such as vehicle camera module, industrial camera module, infrared camera module and medical camera module in addition to the mobile phone camera module.

Claims (13)

1. An optical system, characterized in that the optical system (2) is a five-piece aspheric structure, comprising a first lens (21), a second lens (23), a first lens (21), a second lens (23), The third mirror (25), the fourth mirror (27) and the fifth mirror (29), the first mirror (21) is a convex lens, the second mirror (23) is a concave lens, the third mirror (25), the fourth mirror The mirror (27) and the fifth mirror (29) are inverse curved curved lenses, the second mirror (23) and the third mirror (25) have a refractive index nd between 1.62-1.80 and a dispersion coefficient vd less than 35 The optical material component, the first mirror (21) is an optical material component with a refractive index nd less than 1.60 and a dispersion coefficient vd greater than 20, the fourth mirror (27) and the fifth mirror (29) are the refractive index nd intermediate An optical material component between 1.50 and 1.80 and a dispersion coefficient vd between 20 and 70, the third lens (25) has a second curved surface (254) of the third lens, and the third lens has a second curved surface (254). The bending direction of the middle concave part of the surface profile of the curved surface (254) is opposite to the bending direction of the edge of the outer field of view, and the edge chief ray angle θ between the third lens (25) and the fourth lens (27) is between Between 59° and 75°, the diagonal length H of the image plane of the optical system (2) is between 7.80mm-10.50mm. 2. The optical system according to claim 1, wherein the first lens (21) has a first surface (213) of the first lens, and the curvature of the first surface (213) of the first lens is The radius is between 1.2mm-1.85mm. 3. An optical system according to claim 1, characterized in that, the half-field angle α of the optical system (2) is between 20°-85°. 4. An optical system according to claim 1, characterized in that, the total optical length L of the optical system (2) is between 4.2mm-7.5mm. 5 . The optical system according to claim 1 , wherein the total number of pixels on the image plane of the optical system ( 2 ) is more than 40 million pixels. 6 . 6. The optical system according to claim 1, wherein the optical system (2) comprises a first lens (21), a second lens (23), a third lens (25), and a fourth lens (27) and the fifth lens (29) are optical resin material members, liquid silica gel material members, glass material members, quartz members, sapphire material members or transparent optical ceramic material members. 7. A mobile phone camera module, characterized in that it comprises a housing (1), and further comprises the optical system (2) according to any one of claims 1-6 installed in the housing (1), wherein the An infrared cut filter (3) is installed at the rear of the optical system (2), an image sensor (4) is installed at the rear of the infrared cut filter (3), and the optical system (2) is equipped with at least A deformed elastomer fits into the positioning structure (5). 8. A mobile phone camera module according to claim 7, wherein the deformed elastic body fitting and positioning structure (5) comprises a deformed elastic body mounted on the flange of the first lens (21). A first elastic body (212), a deformed second elastic body (232) installed on the flange edge of the second lens (23), the flange edge of the second lens (23) is provided with a matching deformation The first fitting and positioning groove (231) of the first elastic body (212), the first elastic body (212) is closely matched with the first fitting and positioning groove (231), and the third lens (25) The flange edge is provided with a second fitting and positioning groove (251) for a deformed second elastic body (232), and the second elastic body (232) is closely matched with the second fitting and positioning groove (251). 9 . The camera module of a mobile phone according to claim 8 , wherein the first elastic body (212) and the second elastic body (232) are hump-shaped structures that are convex on both sides and concave in the middle, 10 . The number of protrusions of the hump-shaped structure is two or more, and it is arranged in a point shape, a ring shape or a polygonal shape. Arc curve, the middle is a transition arc connection, the first fitting positioning groove (231) and the second fitting positioning groove (251) are concave positioning groove structures, and the cross-sectional profile of the concave positioning groove structure is inverted Trapezoidal, V-shaped or U-shaped, the hump-shaped structure and the inner concave positioning groove structure are correspondingly arranged, and the order in which the hump-shaped structure and the inner concave positioning groove structure are arranged is that one side is the hump-shaped structure, and the other side is the inner The concave positioning groove structure or one side is a concave positioning groove structure, and the other side is a hump-shaped structure. 10 . The camera module of a mobile phone according to claim 8 , wherein the first elastic body ( 212 ) and the first lens ( 21 ) are a single-piece plastic member or a first elastic body of the same material. 11 . (212) and the first lens (21) are made of a two-material integrated plastic component of different materials, and the second elastic body (232) and the second lens (23) are a single-piece plastic component or a second elastomer of the same material (232) and the second lens (23) are made of two-material integrated plastic components of different materials. 11. A mobile phone camera module according to claim 10, wherein the first elastic body (212) and the first lens (21) are made of the same material, and the first elastic body (212) ) and the first lens (21) are formed at one time, the second elastic body (232) and the second lens (23) are made of the same material, and the second elastic body (232) and the second lens (23) are formed at one time forming. 12. A mobile phone camera module according to claim 10, wherein the first elastic body (212) and the first lens (21) are made of different materials, and the first elastic body (212) is a flexible liquid silicone member or a silicone rubber member, the second elastic body (232) and the second lens (23) are made of different materials, and the second elastic body (232) is a flexible liquid silicone member or silicone rubber The first elastic body (212) and the second elastic body (232) are formed by 3D printing silicone after two-material molding, in-mold insert molding or injection molding. 13. A mobile phone camera module according to claim 7, characterized in that a first Mylar ( 22), a second Mylar (24) is installed between the flanges of the second lens (23) and the third lens (25), the third lens (25) and the fourth lens (27) A third Mylar (26) is installed between the flanges of the ), and a spacer (28) is installed between the flanges of the fourth lens (27) and the fifth lens (29).

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