WO2021072668A1

WO2021072668A1 - Optical system, camera module and terminal device

Info

Publication number: WO2021072668A1
Application number: PCT/CN2019/111414
Authority: WO
Inventors: 蔡雄宇; 许哲源; 黎康熙; 谈智伟
Original assignee: 南昌欧菲光电技术有限公司
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2021-04-22

Abstract

An optical system (100), comprising the following in sequence from the object side to the image side: a first lens (L1) having positive refractive power; a second lens (L2) having negative refractive power; a third lens (L3) having negative refractive power; a fourth lens (L4) having negative refractive power; a fifth lens (L5) having negative refractive power; and a sixth lens (L6) having positive refractive power. Moreover, the optical system (100) satisfies the relationship: 0.51≤TLENS/TTL≤0.71, wherein TLENS is the distance on the optical axis from an object side surface (S1) of the first lens (L1) to an image side surface (S12) of the sixth lens (L6), and TTL is the total optical length of the optical system (100).

Description

Optical system, camera module and terminal equipment

Technical field

The present invention relates to the field of optical imaging, in particular to an optical system, camera module and terminal equipment.

Background technique

With the popularization of smart phones, the public has increasingly higher requirements for mobile phone cameras, especially the demand for remote shooting. However, for a general camera module with a telephoto function, the size of the camera module is relatively large, and the space occupied in the device becomes larger, which makes it difficult for the device to realize a miniaturized design.

Summary of the invention

According to various embodiments of the present application, an optical system, a camera module, and a terminal device are provided.

An optical system, from the object side to the image side, includes:

The first lens with positive refractive power;

A second lens with negative refractive power;

The third lens with negative refractive power;

The fourth lens with negative refractive power;

The fifth lens with negative refractive power;

The sixth lens with positive refractive power;

And the optical system satisfies the following relationship:

0.51≤TLENS/TTL≤0.71;

Wherein, TLENS is the distance from the object side of the first lens to the image side of the sixth lens on the optical axis, and TTL is the total optical length of the optical system.

A camera module includes a photosensitive element and the optical system described in any one of the above embodiments, and the photosensitive element is arranged on the image side of the sixth lens. By adopting the above-mentioned optical system, the camera module will also have the characteristics of miniaturization.

A terminal device includes the camera module described in any one of the above embodiments. By adopting the above-mentioned camera module, the terminal device will have telephoto capability, and at the same time, it will be conducive to miniaturization design.

The details of one or more embodiments of the present invention are set forth in the following drawings and description. Other features, objects and advantages of the present invention will become apparent from the description, drawings and claims.

Description of the drawings

In order to better describe and explain the embodiments and/or examples of those inventions disclosed herein, one or more drawings may be referred to. The additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the currently described embodiments and/or examples, and the best mode of these inventions currently understood.

FIG. 1 is a schematic diagram of the optical system in the first embodiment of the application;

2 is an aberration diagram of the optical system in the 1.0 field of view in the first embodiment of the application;

3 is an aberration diagram of the optical system in the 0.5 field of view in the first embodiment of the application;

4 is an aberration diagram of the optical system in the 0 field of view in the first embodiment of the application;

5 is a schematic diagram of the optical system in the second embodiment of the application;

6 is an aberration diagram of the 1.0 field of view of the optical system in the second embodiment of the application;

FIG. 7 is an aberration diagram of 0.5 field of view of the optical system in the second embodiment of the application;

FIG. 8 is an aberration diagram of the 0 field of view of the optical system in the second embodiment of the application; FIG.

FIG. 9 is a schematic diagram of the optical system in the third embodiment of the application;

10 is an aberration diagram of the 1.0 field of view of the optical system in the third embodiment of the application;

11 is an aberration diagram of 0.5 field of view of the optical system in the third embodiment of the application;

FIG. 12 is an aberration diagram of the optical system in the third embodiment of the application with a field of view of 0;

FIG. 13 is a schematic diagram of a camera module using an optical system in an embodiment of the application;

FIG. 14 is a schematic diagram of a terminal device using a camera module in an embodiment of the application.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be more fully described below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or a central element may also be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. The terms "inner", "outer", "left", "right" and similar expressions used herein are for illustrative purposes only, and do not mean that they are the only embodiments.

In order to reduce the size of the module, and further reduce the occupied volume of the module in the device, so as to realize the miniaturization design of the device, this application provides an optical system, a camera module, and a terminal device.

1, in an embodiment of the present application, the optical system 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, and Six lens L6. Among them, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has positive refractive power.

In the above-mentioned optical system 100, the first lens L1 can provide positive refractive power for the optical system 100, so as to shorten the total optical length of the optical system 100, which is conducive to the realization of a miniaturized design. The second lens L2 provides negative refractive power for the optical system 100 to balance the chromatic aberration and spherical aberration generated by the first lens L1, so that the optical system 100 can correct axial chromatic aberration and spherical aberration. At the same time, the fourth lens L4 provides negative refractive power for the optical system 100, so that the curvature of field can be corrected well. The sixth lens L6 provides positive refractive power for the optical system 100 and performs final correction on the optical system 100. At the same time, the lenses on the object side are combined to form the optical system 100 with telephoto effect, and at the same time, the optical system 100 has excellent Imaging performance.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 each include only one lens. It should be noted that, in some embodiments, one or more of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be made of A lens group composed of two or more lenses.

The first lens L1 includes an object side S1 and an image side S2, the second lens L2 includes an object side S3 and an image side S4, the third lens L3 includes an object side S5 and an image side S6, and the fourth lens L4 includes an object side S7 and an image side S8, the fifth lens L5 includes an object side surface S9 and an image side surface S10, and the sixth lens L6 includes an object side surface S11 and an image side surface S12.

In some embodiments, the optical system 100 includes an infrared cut filter L7 disposed on the image side of the sixth lens L6, and the infrared cut filter L7 includes an object side surface S13 and an image side surface S14. The infrared cut filter L7 can filter out the infrared light, preventing the infrared light from reaching the imaging surface S15 and causing interference to normal imaging.

In addition, the optical system 100 includes an imaging surface S15 on the image side of the sixth lens L6, and the imaging surface S15 may be a photosensitive surface of a photosensitive element.

In some embodiments, the optical system 100 includes at least one of the following:

a. The object side S1 of the first lens L1 is convex, and the image side S2 is both concave. At this time, the positive refractive power of the first lens L1 can be strengthened, so that the total optical length of the optical system 100 is further shortened, which is conducive to miniaturization. Design

b. The image side surface S8 of the fourth lens L4 is concave. In this case, it can effectively correct the object side surfaces (the first lens L1, the second lens L2, the object side and the image side of the third lens L3, and the fourth lens L4 S7) field curvature of the object side;

c. The image side surface S10 of the fifth lens L5 is concave. At this time, the spherical aberration, coma and astigmatism generated by the object side surface S9 of the fifth lens L5 can be effectively balanced;

d. The object side surface S11 of the sixth lens L6 is convex. At this time, the positive refractive power of the sixth lens L6 can be further strengthened, so as to provide multiple lenses with negative refractive power on the object side (the second lens L2, the third lens L3, The aberrations generated by the fourth lens L4 and the fifth lens L5) are effectively corrected. In addition, the above arrangement can also shorten the size of the optical system 100 in the optical axis direction.

In some embodiments, the object side and the image side of each lens of the optical system 100 are both aspherical, and the adoption of an aspherical structure can increase the flexibility of lens design, effectively correct spherical aberration, and improve imaging quality. In other embodiments, the object side surface and the image side surface of each lens of the optical system 100 may also be spherical surfaces. It should be noted that the above-mentioned embodiments are only examples of some embodiments of the present application. In some embodiments, the surface of each lens in the optical system 100 may be an aspheric surface or any combination of spherical surfaces.

In some embodiments, there is at least one inflection point on the image side surface S12 of the sixth lens L6. Specifically, in one of the embodiments, the image side surface S12 of the sixth lens L6 has a convex surface, a concave surface, and a convex surface in order from the optical axis to the edge. When the surface of the lens is aspheric, you can refer to the aspheric formula:

Among them, Z is the longitudinal distance between any point on the aspheric surface and the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the curvature of the vertex (the reciprocal of the radius of curvature), k is the conic constant, A, B, C, D, E , F, G... are aspheric coefficients.

In some embodiments, in addition to a lens with refractive power, the optical system 100 may also include elements such as a diaphragm, a filter, a protective glass, a photosensitive element, and a mirror for changing the incident light path.

The optical system 100 includes an aperture stop. In some embodiments, the aperture stop is disposed on the object side of the sixth lens L6, that is, between the object and the sixth lens L6. Specifically, in some embodiments, the aperture stop is disposed on the object side of the first lens L1. In some embodiments, the aperture stop is disposed between the first lens L1 and the sixth lens L6, for example, between the first lens L1 and the second lens L2, between the second lens L2 and the third lens L3, Between the third lens L3 and the fourth lens L4, between the fourth lens L4 and the fifth lens L5, or between the fifth lens L5 and the sixth lens L6. In some other embodiments, the aperture stop is located on the surface (object side or image side) of any one of the first lens L1 to the sixth lens L6. For example, the lens holder, the coating, etc. are arranged on The surface of the lens, thereby forming an aperture stop on the surface. It should be noted that in the embodiments of this application, when the aperture stop is described as being set on the object side of a certain lens, or the aperture stop is described as being set between the object and a certain lens, the aperture stop is set on the object side of a certain lens. The projection of the lens on the optical axis may overlap with the projection of the lens on the optical axis, or may not overlap.

In some embodiments, the materials of each lens in the optical system 100 may be glass or plastic. The plastic lens can reduce the weight and production cost of the optical system 100, while the glass lens enables the optical system 100 to have Excellent optical performance and high temperature resistance characteristics. It should be noted that the material of each lens in the optical system 100 can also be any combination of glass and plastic, and the material of each lens is not necessarily just glass or plastic. In some embodiments, the material of the first lens L1 is glass, and the material of the other lenses in the optical system 100 is plastic, so that the optical system 100 can withstand a higher temperature on the object side while maintaining a low production cost. .

In some embodiments, the optical system 100 satisfies the relationship: 0.51≤TLENS/TTL≤0.71; TLENS is the distance from the object side S1 of the first lens L1 to the image side S12 of the sixth lens L6 on the optical axis, and TTL is the optical system The total optical length of 100. TLENS/TTL can be 0.600, 0.605, 0.610, 0.615, 0.620 or 0.625. When the above relationship is satisfied, the smaller the ratio, the smaller the size of the optical system 100 in the direction of the optical axis, and the length of the lens barrel on which the optical system 100 is loaded will also be shortened, thereby facilitating the molding of the lens barrel; the larger the ratio, the greater The design difficulty of the optical system 100 is reduced. When TLENS/TTL>0.71, the optical back focus of the optical system 100 is short, which is not conducive to assembly; when TLENS/TTL<0.51, the arrangement of the lenses is too compact, which is not conducive to the design of the optical system 100, and reduces the overall The optical performance of the system.

In some embodiments, the optical system 100 satisfies the relationship: 2.0≤FNO≤10.0; FNO is the aperture number of the optical system 100. FNO can be 2.92, 2.93, 2.95, 2.96, or 2.97. When the foregoing relationship is satisfied, the optical system 100 can adjust the number of apertures in the range of 2.0 to 10.0, so that aberrations can be well corrected, and the requirements for high imaging quality can be further met.

In some embodiments, the optical system 100 satisfies the relationship: 0.75≤TTL/f≤1.25; TTL is the total optical length of the optical system 100, that is, the object side surface S1 of the first lens L1 to the imaging surface S15 of the optical system 100 are on the optical axis , And f is the effective focal length of the optical system 100. TTL/f can be 0.815, 0.820, 0.825, 0.830, or 0.835. Under the condition that the above relationship is satisfied, when the total optical length of the optical system 100 remains unchanged, the smaller the value of the above relationship, the longer the effective focal length of the optical system 100 and the smaller the field of view, so that the optical system 100 has telephoto Characteristics; Under the conditions of satisfying the above relationship, when the total optical length of the optical system 100 remains unchanged, the larger the value of the above relationship, the shorter the effective focal length of the optical system 100 and the increase in the field of view, so that the optical system 100 has Wide-angle characteristics. In addition, when it is lower than the lower limit, the power of the image side lens system will decrease, which will easily cause chromatic aberration of magnification and reduce the resolution of the image. When it exceeds the upper limit, the overall size of the optical system 100 will become larger, and the total length of the optical system 100 and the radius of the lens therein will also be too large. Therefore, when the above relationship is satisfied, a high-resolution image can be obtained, and the optical system 100 can be made more compact.

In some embodiments, the optical system 100 satisfies the relationship: 0.20≦f1/f≦0.62; where f1 is the focal length of the first lens L1, and f is the effective focal length of the optical system 100. Specifically, f1/f may be 0.403, 0.405, 0.410, 0.415, 0.418, or 0.420. When the foregoing relational expression is satisfied, the first lens L1 has an appropriate focal length, which is beneficial to the distribution and optimization of the refractive power of the optical system 100, so that the optical system 100 has ideal optical performance.

In some embodiments, the optical system 100 and the photosensitive element are assembled to form a camera module, and the incident light is adjusted by the optical system 100 to form an image on the photosensitive surface of the photosensitive element and be received. At this time, in some of the embodiments, the camera module satisfies the relationship: 1.00≤TTL/IMA≤3.00; where IMA is the diagonal distance of the effective pixel area of the photosensitive element. Specifically, TTL/IMA may be 2.00, 2.03, 2.05, 2.08, 2.10, or 2.11. Under the condition that the above relationship is satisfied, when the total optical length of the optical system 100 is determined, the greater the diagonal distance of the effective pixel area of the photosensitive element, the more wide-angle characteristics of the optical system 100, and the greater the diagonal distance of the effective pixel area of the photosensitive element The smaller it is, the more it has telephoto characteristics. When the diagonal distance of the effective pixel area of the photosensitive element becomes twice the original size, the size of the optical system 100 can also be simultaneously enlarged to twice the original size, and the number of apertures and the angle of view remain unchanged at this time. When the above relationship is satisfied, it is also conducive to the photosensitive element to receive complete optical information, and it is also conducive to the miniaturization design of the camera module.

Based on the description of the foregoing embodiments, more specific embodiments and drawings are presented below for detailed description.

The first embodiment

Referring to Figures 1, 2, 3, and 4, Figure 1 is a schematic diagram of the structure of the optical system 100 in the first embodiment. The optical system 100 includes a first lens L1 with positive refractive power from the object side to the image side in turn. The second lens L2 with negative refractive power, the third lens L3 with negative refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, and the sixth lens L6 with positive refractive power. In addition, the aperture stop is located on the object side S3 of the second lens L2. 2 is an aberration diagram of the optical system 100 in the first embodiment in a 1.0 field of view, FIG. 3 is an aberration diagram of the optical system 100 in the first embodiment in a 0.5 field of view, and FIG. 4 is an aberration diagram of the optical system in the first embodiment 100 to 0 field of view aberration diagram.

The object side surface S1 of the first lens L1 is convex on the optical axis, and the image side surface S2 is concave on the optical axis.

The object side surface S3 of the second lens L2 is convex on the optical axis, and the image side surface S4 is concave on the optical axis.

The object side surface S5 of the third lens L3 is convex on the optical axis, and the image side surface S6 is concave on the optical axis.

The object side surface S7 of the fourth lens L4 is convex on the optical axis, and the image side surface S8 is concave on the optical axis.

The object side surface S9 of the fifth lens L5 is concave at the optical axis, and the image side surface S10 is concave at the optical axis.

The object side surface S11 of the sixth lens L6 is convex on the optical axis, and the image side surface S12 is convex on the optical axis.

Above, since the object side S1 of the first lens L1 is convex, and the image side S2 is both concave, at this time, the positive refractive power of the first lens L1 can be strengthened, so that the total optical length of the optical system 100 can be further shortened, thereby facilitating realization Miniaturized design; since the image side surface S8 of the fourth lens L4 is concave, at this time, it can effectively correct the object side surfaces (the first lens L1, the second lens L2, the object side and the image side of the third lens L3, and the first lens L1, the second lens L2, and the third lens L3). The field curvature of the object side surface S7 of the four lens L4; since the image side surface S10 of the fifth lens L5 is concave, at this time, the spherical aberration, coma and astigmatism generated by the object side surface S9 of the fifth lens L5 can be effectively balanced; Since the object side surface S11 of the sixth lens L6 is convex, the positive refractive power of the sixth lens L6 can be further strengthened at this time, so as to provide multiple lenses with negative refractive power on the object side (the second lens L2, the third lens L3, and the third lens L3). The aberrations generated by the four lens L4 and the fifth lens L5) are effectively corrected. In addition, the above arrangement can further shorten the size of the optical system 100 in the optical axis direction.

The object and image sides of each lens of the first lens L1 to the sixth lens L6 are aspherical. The design of the aspherical surface can solve the problem of distortion of the field of view, and can also make the lens smaller, thinner and flat. Achieves excellent optical effects, thereby enabling the optical system 100 to have miniaturization characteristics.

The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastic. The plastic lens can reduce the weight of the optical system 100 and can also reduce the weight of the optical system 100. reduce manufacturing cost.

The image side of the sixth lens L6 is also provided with an infrared cut filter L7 made of glass to filter out infrared light and prevent the infrared light from affecting imaging. The material of the infrared cut filter L7 is glass. The infrared cut filter L7 may belong to a part of the optical system 100 and be assembled with each lens, or may also be installed when the optical system 100 is assembled with the photosensitive element.

In the first embodiment, the optical system 100 satisfies the relationship: TLENS/TTL=0.595; TLENS is the distance from the object side S1 of the first lens L1 to the image side S12 of the sixth lens L6 on the optical axis, and TTL is the optical system 100 The total optical length. When the above relationship is satisfied, it is beneficial to strike a balance between the difficulty of lens barrel molding and design.

The optical system 100 satisfies the relationship: FNO=2.99; FNO is the aperture number of the optical system 100. When the foregoing relationship is satisfied, the aberration of the optical system 100 can be well corrected to further meet the requirements for high imaging quality.

The optical system 100 satisfies the relationship: TTL/f=0.837; TTL is the total optical length of the optical system 100, that is, the distance from the object side S1 of the first lens L1 to the imaging surface S15 of the optical system 100 on the optical axis, and f is the optical system 100 Effective focal length. When the above relationship is satisfied, a high-resolution image can be obtained, and the optical system 100 can be made more compact.

The optical system 100 satisfies the relationship: f1/f=0.42; where f1 is the focal length of the first lens L1, and f is the effective focal length of the optical system 100. When the foregoing relational expression is satisfied, the first lens L1 has an appropriate focal length, which is beneficial to the distribution and optimization of the refractive power of the optical system 100, so that the optical system 100 has ideal optical performance.

When the optical system 100 and the photosensitive element are assembled into a camera module, the camera module satisfies the relationship: TTL/IMA=2.12; where IMA is the diagonal distance of the effective pixel area of the photosensitive element. When the above relationship is satisfied, it is beneficial for the photosensitive element to receive complete optical information, and at the same time, it is also beneficial for the miniaturization design of the camera module. In the first, second, and third embodiments, the diagonal distance IMA of the effective pixel area is 5 mm.

In addition, various parameters of the optical system 100 are given in Table 1 and Table 2. The image plane in Table 1 is the imaging surface S15 of the optical system 100, and the imaging surface S15 can be understood as the photosensitive surface of the photosensitive element. The elements from the object plane to the imaging surface S15 are arranged in the order of the elements in Table 1 from top to bottom. The radius of curvature in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the near optical axis. The surface 1 and the surface 2 are respectively the object side S1 and the image side S2 of the first lens L1, that is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. The first value in the “thickness” parameter column of the first lens L1 is the thickness of the lens on the optical axis, and the second value is the object side of the lens from the image side to the image side of the next lens on the optical axis On the distance. Table 2 shows the aspheric coefficients of each lens in the optical system 100, where K is the conic constant, and A, B, C, D, etc. are the coefficients of the higher-order terms in the aspheric formula. The focal length of each lens is a value at a wavelength of 546 nm, and the refractive index and Abbe number are values at a wavelength of 587.6 nm. The calculation of the relationship and the surface shape of the lens are based on the lens parameters (such as the data in Table 1) and the aspheric coefficient (such as the data in Table 2).

In the first embodiment, the effective focal length of the optical system 100 is f=12.666mm, the number of apertures is FNO=2.99, and the maximum field angle of the optical system 100 in the diagonal direction of the effective pixel area is FOV(deg)=22.2°, The distance from the object side surface S1 of the first lens L1 to the imaging surface S15 on the optical axis is TTL=10.601 mm.

The focal length of the first lens L1 is f1=5.314mm, the focal length of the second lens L2 is f2=-11.813mm, the focal length of the third lens L3 is f3=-4184.594mm, and the focal length of the fourth lens L4 is f4=-8.821mm , The focal length of the fifth lens L5 is f5=-12.637mm, and the focal length of the sixth lens L6 is f6=11.518mm. The aperture stop is located on the object side S3 of the second lens L2.

Table 1

Table 2

Second embodiment

Referring to Figures 5, 6, 7 and 8, Figure 5 is a schematic structural view of the optical system 100 in the second embodiment. The optical system 100 includes a first lens L1 with positive refractive power from the object side to the image side in turn. The second lens L2 with negative refractive power, the third lens L3 with negative refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, and the sixth lens L6 with positive refractive power. In addition, the aperture stop is located on the object side S3 of the second lens L2. 6 is an aberration diagram of the optical system 100 in the second embodiment at a 1.0 field of view, FIG. 7 is an aberration diagram of the optical system 100 in the second embodiment at a 0.5 field of view, and FIG. 8 is an aberration diagram of the optical system in the second embodiment 100 to 0 field of view aberration diagram.

The object side surface S3 of the second lens L2 is concave at the optical axis, and the image side surface S4 is concave at the optical axis.

The object side surface S5 of the third lens L3 is concave at the optical axis, and the image side surface S6 is convex at the optical axis.

The object side surface S7 of the fourth lens L4 is concave at the optical axis, and the image side surface S8 is concave at the optical axis.

The parameters of the optical system 100 are given in Table 3, Table 4 and Table 5. The focal length of each lens is a value at a wavelength of 546nm, and the refractive index and Abbe number are values at a wavelength of 587.6nm, and the definition of each parameter can be The first embodiment is obtained and will not be repeated here.

table 3

Table 4

table 5

The optical system 100 in the second embodiment satisfies the following relationship:

The third embodiment

Referring to Figure 9, Figure 10, Figure 11 and Figure 12, Figure 9 is a schematic diagram of the structure of the optical system 100 in the third embodiment, the optical system 100 from the object side to the image side sequentially includes a first lens L1 with positive refractive power, having The second lens L2 with negative refractive power, the third lens L3 with negative refractive power, the fourth lens L4 with negative refractive power, the fifth lens L5 with negative refractive power, and the sixth lens L6 with positive refractive power. In addition, the aperture stop is located on the object side S3 of the second lens L2. 10 is an aberration diagram of the optical system 100 in the third embodiment at a field of view of 1.0, FIG. 11 is an aberration diagram of the optical system 100 in the third embodiment at a field of view of 0.5, and FIG. 12 is an aberration diagram of the optical system in the third embodiment 100 to 0 field of view aberration diagram.

The various parameters of the optical system 100 are given in Table 6, Table 7 and Table 8. The focal length of each lens is the value at the wavelength of 546nm, the refractive index and the Abbe number are the value at the wavelength of 587.6nm, and the definition of each parameter can be The first embodiment is obtained and will not be repeated here.

Table 6

Table 7

Table 8

The optical system 100 in the third embodiment satisfies the following relationship:

Referring to FIG. 13, in some embodiments, the optical system 100 and the photosensitive element 210 are assembled to form the camera module 200, and the photosensitive element 210 is disposed on the image side of the sixth lens L6 in the optical system 100. An infrared cut filter L7 is arranged between the sixth lens L6 and the photosensitive element 210 to prevent infrared light from reaching the photosensitive element 210 and interfere with the visible light imaging. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor). By adopting the optical system 100, the camera module 200 will have a telephoto capability as well as a miniaturization feature.

In some embodiments, the distance between the photosensitive element 210 and each lens in the optical system 100 is relatively fixed, so that the camera module 200 becomes a fixed focus module. At this time, the camera module 200 can be used as the front camera module 200 of the device. To sharply image objects within a specific distance (such as 20cm to 50cm). In other embodiments, a driving element such as a voice coil motor can be provided to enable the photosensitive element 210 to move relative to each lens in the optical system 100 to achieve a focusing effect. Specifically, the driving element can drive the lens barrel of each lens of the loaded optical system 100 to move to realize the above-mentioned focusing function. In some embodiments, a matching algorithm can also be used to control the movement of at least one lens in the optical system 100 relative to other lenses, so as to achieve an optical zoom effect.

Referring to FIG. 14, the camera module 200 can be applied to a terminal device 30, such as a smart phone, a smart watch, a tablet computer, a vehicle (such as a smart driving), a drone, a game console, a PDA (Personal Digital Assistant, personal digital assistant). ), a terminal device 30 with a camera function, such as a household electrical appliance. By adopting the above-mentioned camera module 200, the terminal device 30 will have a telephoto capability, and at the same time, it will be beneficial to a miniaturized design. Specifically, when the camera module 200 is applied to a smart phone, the camera module 200 can be used as a front camera module of the smart phone 10, and the camera module 200 at this time may be a fixed focus module. When the camera module 200 is used as a rear camera module of a smart phone, the camera module 200 may be a camera module capable of focusing and zooming. In addition, in some embodiments, the camera module 200 with a telephoto function and a camera module with a wide-angle camera function can also be installed in the terminal device 30 at the same time, so that the user can select different camera functions.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply the pointed device or element It must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal connection of two components or the interaction relationship between two components, unless otherwise specified The limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless expressly stipulated and defined otherwise, the first feature “on” or “under” the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. contact. Moreover, the "above", "above" and "above" of the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or it simply means that the level of the first feature is higher than the second feature. The “below”, “below” and “below” of the second feature of the first feature may be that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several embodiments of the present invention, and the descriptions are more specific and detailed, but they should not be understood as limiting the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

An optical system, from the object side to the image side, includes:

The first lens with positive refractive power;

A second lens with negative refractive power;

The third lens with negative refractive power;

The fourth lens with negative refractive power;

The fifth lens with negative refractive power;

The sixth lens with positive refractive power;

And the optical system satisfies the following relationship:

0.51≤TLENS/TTL≤0.71;

Wherein, TLENS is the distance from the object side of the first lens to the image side of the sixth lens on the optical axis, and TTL is the total optical length of the optical system.
The optical system according to claim 1, further comprising an aperture stop, the aperture stop being arranged on the object side of the sixth lens.
The optical system according to claim 1, characterized by comprising an aperture stop located on the surface of any one of the first lens to the sixth lens.
The optical system according to claim 1, wherein the following relationship is satisfied:

2.00≤FNO≤10.00;

Wherein, FNO is the aperture number of the optical system.
The optical system according to claim 1, wherein the object side surface of the first lens is a convex surface, and the image side surface is a concave surface.
The optical system according to claim 1, wherein the image side surface of the fourth lens is concave.
The optical system according to claim 1, wherein the image side surface of the fifth lens is concave.
The optical system according to claim 1, wherein the object side surface of the sixth lens is convex.
The optical system according to claim 1, wherein the following relationship is satisfied:

0.75≤TTL/f≤1.25;

Wherein, f is the effective focal length of the optical system.
The optical system according to claim 1, wherein the following relationship is satisfied:

0.20≤f1/f≤0.62;

Wherein, f1 is the focal length of the first lens, and f is the effective focal length of the optical system.
The optical system according to claim 1, wherein the object side surface and the image side surface of each lens of the first lens to the sixth lens are aspherical surfaces.
The optical system according to claim 1, wherein the materials of the first lens to the sixth lens are all plastic.
The optical system according to claim 1, wherein an infrared cut filter is provided on the image side of the sixth lens.
A camera module, comprising a photosensitive element and the optical system according to any one of claims 1 to 13, and the photosensitive element is arranged on the image side of the sixth lens.
The camera module of claim 14, wherein the following relationship is satisfied:

1.00≤TTL/IMA≤3.00;

Wherein, IMA is the diagonal distance of the effective pixel area of the photosensitive element.
A terminal device, characterized by comprising the camera module according to claim 14 or 15.