CN210720851U - Optical system, camera module and terminal equipment - Google Patents
Optical system, camera module and terminal equipment Download PDFInfo
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- CN210720851U CN210720851U CN201921733180.9U CN201921733180U CN210720851U CN 210720851 U CN210720851 U CN 210720851U CN 201921733180 U CN201921733180 U CN 201921733180U CN 210720851 U CN210720851 U CN 210720851U
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Abstract
The utility model relates to an optical system, module and terminal equipment make a video recording. The optical system includes in order from an object side to an image side: the first lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the second lens element with negative refractive power has a concave object-side surface and a concave image-side surface; a third lens element with negative refractive power; a fourth lens element with negative refractive power; a fifth lens element with negative refractive power; and a sixth lens element with positive refractive power. The optical system has excellent imaging performance and telephoto effect due to the cooperation of the lenses.
Description
Technical Field
The utility model relates to an optical imaging field especially relates to an optical system, module and terminal equipment make a video recording.
Background
With the popularization of smart phones, the requirements of the public on mobile phone camera shooting are increasingly raised, and especially the requirements on long-range shooting are particularly outstanding. However, for a general camera module, the effective focal length of an optical system in the camera module is difficult to satisfy the condition of telephoto, the imaging performance in telephoto is poor, and the requirement of a user on long-range shooting cannot be satisfied.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide an optical system, an image pickup module, and a terminal device, in order to solve the problem of how to realize an excellent telephoto function.
An optical system comprising, in order from an object side to an image side:
the optical lens comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, and a fourth lens element with positive refractive power, wherein the object-side surface and the image-side surface of the first lens element are convex;
the second lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
a third lens element with negative refractive power;
a fourth lens element with negative refractive power;
a fifth lens element with negative refractive power; and
a sixth lens element with positive refractive power.
In the above optical system, the first lens element can provide positive refractive power for the optical system to shorten the total optical length of the optical system, and the object-side surface of the first lens element is convex, so that the positive refractive power of the first lens element can be enhanced, the total optical length of the optical system can be further shortened, and the miniaturization design can be realized. The second lens provides negative refractive power for the optical system to balance chromatic aberration and spherical aberration generated by the first lens, so that the optical system can correct axial chromatic aberration and spherical aberration. Meanwhile, the image side surface of the second lens is a concave surface, so that the spherical aberration can be prevented from being excessively corrected. The fourth lens element provides negative refractive power to the optical system, thereby enabling good correction of curvature of field. In addition, the sixth lens element provides positive refractive power for the optical system, performs final correction on the optical system, and cooperates with the lens elements on the object side to form the optical system with a telephoto effect and excellent imaging performance.
In one embodiment, the optical system comprises an aperture stop, and the aperture stop satisfies any one of the following:
the aperture diaphragm is arranged on the object side of the first lens;
the aperture diaphragm is arranged between the first lens and the sixth lens;
the aperture stop is located on a surface of any one of the first lens to the sixth lens.
In one embodiment, the optical system satisfies the following relationship:
2.0≤FNO≤10.0；
the FNO is an f-number of the optical system.
In one embodiment, the object side surface of the sixth lens element is convex. Since the object-side surface of the sixth lens element is convex, the positive refractive power of the sixth lens element can be further enhanced, and thus aberration generated by a plurality of lens elements with negative refractive power at the object side can be effectively corrected.
In one embodiment, the optical system satisfies the following relationship:
0.75≤TTL/f≤1.25；
TTL is the total optical length of the optical system, and f is the effective focal length of the optical system. Under the condition that the relation is satisfied, when the total optical length of the optical system is kept unchanged, the smaller the numerical value of the relation, the longer the effective focal length of the optical system is, and the smaller the angle of view is, so that the optical system has the telephoto characteristic; when the total optical length of the optical system is kept constant under the condition that the above relation is satisfied, the effective focal length of the optical system is shorter and the angle of view is increased as the numerical value of the above relation is larger, so that the optical system has wide-angle characteristics. If the refractive index is lower than the lower limit, the refractive index of the image-side lens system becomes small, and chromatic aberration of magnification tends to occur, resulting in a decrease in image resolution. Above the upper limit, the overall size of the optical system becomes large, and the total length of the optical system and the radius of the lens therein become too large. Therefore, when the above relationship is satisfied, an image with high resolution can be obtained, and the optical system can be made more compact.
In one embodiment, the optical system satisfies the following relationship:
0.51≤TLENS/TTL≤0.71；
TLENS is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and TTL is the total optical length of the optical system. When the above relation is satisfied, the smaller the ratio is, the smaller the size of the optical system in the optical axis direction is, and the shorter the length of the lens barrel carrying the optical system is, thereby facilitating the molding of the lens barrel; the larger the ratio is, the more difficult the design of the optical system is favorably reduced. When TLENS/TTL is more than 0.71, the optical system has shorter optical back focus and is not beneficial to assembly; when TLENS/TTL < 0.51, the arrangement between lenses is too compact to be advantageous for the design of the optical system, while reducing the optical performance of the entire system.
In one embodiment, the optical system satisfies the following relationship:
0.16≤f1/f≤0.59；
f1 is the focal length of the first lens, and f is the effective focal length of the optical system. When the above relation is satisfied, the first lens element has a proper focal length, which is beneficial to the refractive power distribution and optimization of the optical system, so that the optical system has ideal optical performance.
An image capturing module includes a light sensing element and the optical system of any of the above embodiments, wherein the light sensing element is disposed on an image side of the sixth lens element. By adopting the optical system, the camera module also has the telephoto capability and the miniaturization characteristic.
In one embodiment, the camera module satisfies the following relationship:
1≤TTL/IMA≤3；
TTL is the total optical length of the optical system, and IMA is the diagonal distance of the effective pixel area of the photosensitive element. When the optical total length of the optical system is determined, the optical system has wide-angle characteristics as the diagonal distance of the effective pixel region of the photosensitive element is larger, and has telephoto characteristics as the diagonal distance of the effective pixel region of the photosensitive element is smaller. When the diagonal distance of the effective pixel area of the photosensitive element is doubled, the size of the optical system can be synchronously enlarged to be doubled, and the f-number and the field angle are kept unchanged. When satisfying above-mentioned relation, still be favorable to photosensitive element receives complete light information, still is favorable to simultaneously the miniaturized design of module of making a video recording.
A terminal device comprises the camera module in each embodiment. Through adopting above-mentioned module of making a video recording, terminal equipment will possess the telephoto capability, and is favorable to miniaturized design simultaneously.
Drawings
FIG. 1 is a schematic view of an optical system according to a first embodiment of the present application;
FIG. 2 is an aberration diagram of a 1.0 field of view of an optical system in a first embodiment of the present application;
FIG. 3 is an aberration diagram of a 0.5 field of view of an optical system in a first embodiment of the present application;
FIG. 4 is an aberration diagram of the 0 field of view of the optical system in the first embodiment of the present application;
FIG. 5 is a schematic view of an optical system according to a second embodiment of the present application;
FIG. 6 is an aberration diagram of a 1.0 field of view of an optical system according to a second embodiment of the present application;
FIG. 7 is an aberration diagram of a 0.5 field of view of an optical system according to a second embodiment of the present application;
FIG. 8 is an aberration diagram of the 0 field of view of an optical system according to a second embodiment of the present application;
FIG. 9 is a schematic view of an optical system according to a third embodiment of the present application;
FIG. 10 is an aberration diagram of a 1.0 field of view of an optical system in a third embodiment of the present application;
FIG. 11 is an aberration diagram of a 0.5 field of view of an optical system in a third embodiment of the present application;
FIG. 12 is an aberration diagram of the 0 field of view of the optical system in the third embodiment of the present application;
fig. 13 is a schematic view of a camera module using an optical system according to an embodiment of the present disclosure;
fig. 14 is a schematic diagram of a terminal device using a camera module according to an embodiment of the present application.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application provides an optical system 100, wherein the optical system 100 includes, in order from an object side to an image side, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The first lens element L1 includes an object-side surface S1 and an image-side surface S2, the second lens element L2 includes an object-side surface S3 and an image-side surface S4, the third lens element L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens element L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens element L5 includes an object-side surface S9 and an image-side surface S10, the sixth lens element L6 includes an object-side surface S11 and an image-side surface S12, the optical system 100 further includes an image plane S15 located on the image-side of the sixth lens element L6, and the image plane S15 may be a photosensitive surface of a photosensitive element.
The object-side surface S1 and the image-side surface S2 of the first lens element L1 are convex surfaces, and the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave surfaces.
In the optical system 100, the first lens element L1 can provide positive refractive power for the optical system 100 to shorten the total optical length of the optical system 100, and since the object-side surface S1 of the first lens element L1 is convex, the positive refractive power of the first lens element L1 can be enhanced, so that the total optical length of the optical system 100 is further shortened, which is beneficial for realizing a compact design. The second lens element L2 provides negative refractive power to the optical system 100 to balance the chromatic aberration and spherical aberration generated by the first lens element L1, so that the optical system 100 can correct the on-axis chromatic aberration and spherical aberration. Meanwhile, since the image-side surface S4 of the second lens L2 is concave, it is also possible to prevent overcorrection of spherical aberration. The fourth lens element L4 provides negative refractive power to the optical system 100, so that curvature of field can be well corrected. The sixth lens element L6 provides positive refractive power to the optical system 100, performs the final correction on the optical system 100, and combines with the lens elements on the object side to form the optical system 100 with telephoto effect.
In some embodiments, the object-side surface S11 of the sixth lens element L6 is convex, and thus the positive refractive power of the sixth lens element L6 can be further strengthened, so that the aberration generated by the object-side lenses with negative refractive power (the second lens element L2, the third lens element L3, the fourth lens element L4, and the fifth lens element L5) can be effectively corrected.
In some embodiments, the optical system 100 includes an aperture stop, which is an element independent from each lens, and the aperture stop may be disposed on the object side of the first lens L1 or between the first lens L1 and the sixth lens L6. In other embodiments, the aperture stop may also be located on a surface (e.g., an object side surface or an image side surface) of any of the first lens L1 through the sixth lens L6, in an operative relationship with the lenses, for example, by applying a light blocking coating to the surface of the lenses to form the aperture stop at that surface; or the surface of the clamping lens is fixedly clamped by the clamping piece, and the structure of the clamping piece on the surface can limit the width of the imaging light beam of the on-axis object point, so that the aperture stop is formed on the surface. Preferably, the aperture stop is located on the object side S3 of the second lens L2.
In some embodiments, the object-side surface and the image-side surface of each lens of the optical system 100 are aspheric, and the aspheric structure can improve 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 be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application, and 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, at least one inflection point exists on the image-side surface S12 of the sixth lens element L6, and in particular, the image-side surface S12 of the sixth lens element L6 in one embodiment is convex, concave and convex in order from the optical axis to the edge. When the surface of the lens is aspherical, reference may be made to the aspherical formula:
where Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance between any point on the aspheric surface and the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is the conic constant, and A, B, C, D, E, F, G … is the aspheric coefficient.
In some embodiments, each lens in the optical system 100 may be made of glass or plastic, the plastic lens can reduce the weight and the production cost of the optical system 100, and the glass lens provides the optical system 100 with excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 may be any combination of glass and plastic, and is not necessarily both glass and 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 at the object side, while the production cost can be kept low.
In some embodiments, the optical system 100 further includes an ir-cut filter L7, the ir-cut filter L7 is disposed between the sixth lens L6 and the image plane S15, and the ir-cut filter L7 includes an object-side surface S13 and an image-side surface S14. The infrared cut-off filter L7 can filter out infrared light, and prevent the infrared light from reaching the imaging surface S15 and causing imaging interference to the photosensitive element.
In some embodiments, optical system 100 satisfies the relationship: FNO is more than or equal to 2.0 and less than or equal to 10.0; FNO is the f-number of the optical system 100. The FNO may be 2.95, 2.96 or 2.97.
In some embodiments, optical system 100 satisfies the relationship: TTL/f is more than or equal to 0.75 and less than or equal to 1.25; TTL is the total optical length of the optical system 100, i.e., the distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 100 on the optical axis, and f is the effective focal length of the optical system 100. TTL/f can be 0.81, 0.82, 0.83, or 0.84. Under the condition that the above relationship is satisfied, when the total optical length of the optical system 100 is kept constant, the smaller the numerical value of the above relational expression is, the longer the effective focal length of the optical system 100 is, and the smaller the angle of view is, so that the optical system 100 has a telephoto characteristic; if the total optical length of the optical system 100 is kept constant under the condition that the above relationship is satisfied, the effective focal length of the optical system 100 becomes shorter and the angle of view increases as the numerical value of the above relationship increases, so that the optical system 100 has a wide-angle characteristic. If the refractive index is lower than the lower limit, the refractive index of the image-side lens system becomes small, and chromatic aberration of magnification tends to occur, resulting in a decrease in image resolution. Above the upper limit, the overall size of the optical system 100 may become large, and the total length of the optical system 100 and the radius of the lens therein may become too large. Therefore, when the above relationship is satisfied, an image with high resolution can be obtained, and the optical system 100 can be made more compact.
In some embodiments, optical system 100 satisfies the relationship: TLENS/TTL is more than or equal to 0.51 and less than or equal to 0.71; TLENS is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the image-side surface S12 of the sixth lens L6, and TTL is the total optical length of the optical system 100. The TLENS/TTL can be 0.597, 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 optical axis direction is, and the shorter the length of the lens barrel on which the optical system 100 is mounted is, thereby facilitating the molding of the lens barrel; the larger the ratio, the more difficult the design of the optical system 100 is. When TLENS/TTL is more than 0.71, the optical back focus of the optical system 100 is shorter, which is not beneficial to assembly; when TLENS/TTL < 0.51, the arrangement between the lenses is too compact to be advantageous for the design of the optical system 100, while reducing the optical performance of the overall system.
In some embodiments, optical system 100 satisfies the relationship: f1/f is more than or equal to 0.16 and less than or equal to 0.59; f1 is the focal length of the first lens L1, and f is the effective focal length of the optical system 100. f1/f may be 0.367, 0.370, 0.372, 0.377, 0.379, 0.381, 0.383, or 0.384. When the above relationship is satisfied, the first lens element L1 has a proper focal length, which is beneficial to the refractive power distribution and optimization of the optical system 100, so that the optical system 100 has ideal optical performance.
In some embodiments, when the optical system 100 and the photosensitive element are assembled into a camera module, the camera module satisfies the relationship: TTL/IMA is more than or equal to 1 and less than or equal to 3; TTL is the total optical length of the optical system 100 and IMA is the diagonal distance of the active pixel area of the photosensitive element. The TTL/IMA can be 2.02, 2.03, 2.05, 2.08, 2.10, 2.11, or 2.12. Under the condition that the above relationship is satisfied, when the optical total length of the optical system 100 is determined, the optical system 100 has the wide-angle characteristic as the diagonal distance of the effective pixel region of the light receiving element is larger, and has the telephoto characteristic as the diagonal distance of the effective pixel region of the light receiving element is smaller. When the diagonal distance of the effective pixel area of the photosensitive element is doubled, the size of the optical system 100 can be synchronously enlarged to be doubled, and the f-number and the field angle are kept unchanged. Still be favorable to the light sensing element to receive complete light information when satisfying above-mentioned relation, still be favorable to the miniaturized design of the module of making a video recording simultaneously.
First embodiment
Referring to fig. 1, the optical system 100 in the first embodiment includes, in order from an object side to an image side, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with negative refractive power, and the sixth lens element L6 with positive refractive power. Fig. 2, 3 and 4 are aberration diagrams of the optical system 100 in the first embodiment.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis.
The object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis.
The object-side surface S5 of the third lens element L3 is concave along the optical axis, and the image-side surface S6 is convex along the optical axis.
The object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is concave along the optical axis.
The object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis.
The object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is convex along the optical axis.
The object-side surface and the image-side surface of each of the first lens L1 to the sixth lens L6 are aspheric, and aspheric design can solve the problem of distortion of the field of view, and can realize excellent optical effects even when the lenses are small, thin, and flat, thereby providing the optical system 100 with miniaturization characteristics. The image-side surface S12 of the sixth lens element L6 is convex, concave, and convex in order from the optical axis to the edge.
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 made of plastic, and the plastic lenses can reduce the weight of the optical system 100 and reduce the production cost.
An ir-cut filter L7 made of glass is disposed at the image side of the sixth lens element L6 to filter infrared light and prevent the infrared light from affecting imaging. The infrared cut filter L7 is made of glass. The infrared cut filter L7 may be part of the optical system 100, and may be mounted together with each lens, or may be mounted together when the optical system 100 is mounted with a photosensitive element.
The optical system 100 in the first embodiment satisfies the relationship: TTL/f is 0.8; TTL is the total optical length of the optical system 100 and f is the effective focal length of the optical system 100. When the above relationship is satisfied, an image with high resolution can be obtained, and the optical system 100 can be made more compact.
The optical system 100 satisfies the relationship: TLENS/TTL is 0.625; TLENS is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the image-side surface S12 of the sixth lens L6, and TTL is the total optical length of the optical system 100. Satisfying the above relationship is advantageous for achieving a balance between the ease of molding and designing the lens barrel.
The optical system 100 satisfies the relationship: f1/f is 0.364; f1 is the focal length of the first lens L1, and f is the effective focal length of the optical system 100. When the above relationship is satisfied, the first lens element L1 has a proper focal length, which is beneficial to the refractive power distribution and optimization 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 is 2.00; TTL is the total optical length of the optical system 100 and IMA is the diagonal distance of the active pixel area of the photosensitive element. Still be favorable to the light sensing element to receive complete light information when satisfying above-mentioned relation, still be favorable to the miniaturized design of the module of making a video recording simultaneously. The diagonal distance IMA of the effective pixel area of the photosensitive element is 5.0 mm.
In addition, the parameters of the optical system 100 are given by table 1 and table 2. The image plane in table 1 is the image forming surface S15 of the optical system 100, and the elements from the object plane to the image forming surface S15 are arranged in the order of the elements from top to bottom in table 1. The radius of curvature in table 1 is the radius of curvature at the optical axis of the object-side surface or the image-side surface of the corresponding surface number. The surface 1 and the surface 2 are the object side surface S1 and the image side surface S2 of the first lens L1, respectively, that is, the surface with the smaller surface number is the object side surface, and the surface with the larger surface number is the image side surface in the same lens. The first numerical value in the "thickness" parameter column of the first lens element L1 is the axial thickness of the lens element, and the second numerical value is the axial distance from the image-side surface of the lens element to the object-side surface of the following lens element in the image-side direction. Table 2 shows aspheric coefficients of the lenses in the optical system 100, where k is a conic constant and A, B, C, D, E, F, G … is an aspheric coefficient.
The focal length of each lens was 546nm, and the refractive index and Abbe number were 587.6 nm.
In the first embodiment, the effective focal length f of the optical system 100 is 12.501mm, the f-number is 2.95, the maximum field angle of the optical system 100 in the diagonal direction of the effective pixel area is fov (deg) 22.1 °, and the distance from the object-side surface S1 of the first lens L1 to the image-forming surface S15 on the optical axis is TTL 10.001 mm.
The focal length of the first lens L1 is f 1-4.556 mm, the focal length of the second lens L2 is f 2-8.709 mm, the focal length of the third lens L3 is f 3-49.494 mm, the focal length of the fourth lens L4 is f 4-12.192 mm, the focal length of the fifth lens L5 is f 5-8.647 mm, and the focal length of the sixth lens L6 is f 6-12.112 mm. The aperture stop is located on the object side S3 of the second lens L2. In each embodiment, the calculation of the relational expression and the information such as the surface type of the lens are based on the lens parameters (e.g., data in table 1) and the aspherical surface coefficients (e.g., data in table 2).
TABLE 1
TABLE 2
Second embodiment
Referring to fig. 5, the optical system 100 in the second embodiment includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with negative refractive power, and the sixth lens element L6 with positive refractive power. Fig. 6, 7 and 8 are aberration diagrams of the optical system 100 in the second embodiment.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis.
The object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis.
The object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is concave along the optical axis.
The object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is concave along the optical axis.
The object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is concave along the optical axis.
The object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is convex along the optical axis.
The object-side surface and the image-side surface of each of the first lens L1 to the sixth lens L6 are aspheric, and aspheric design can solve the problem of distortion of the field of view, and can realize excellent optical effects even when the lenses are small, thin, and flat, thereby providing the optical system 100 with miniaturization characteristics.
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 made of plastic, and the plastic lenses can reduce the weight of the optical system 100 and reduce the production cost.
The parameters of the optical system 100 are given in table 3, table 4 and table 5, and the definitions of the parameters can be derived from the first embodiment, which is not described herein.
TABLE 3
TABLE 4
TABLE 5
Based on the above provided parameter information, the following relationships can be deduced:
third embodiment
Referring to fig. 9, the optical system 100 in the third embodiment includes, in order from the object side to the image side, the first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with negative refractive power, and the sixth lens element L6 with positive refractive power. Fig. 10, 11, and 12 are aberration diagrams of the optical system 100 in the third embodiment.
The object-side surface S1 of the first lens element L1 is convex along the optical axis, and the image-side surface S2 is convex along the optical axis.
The object-side surface S3 of the second lens element L2 is concave along the optical axis, and the image-side surface S4 is concave along the optical axis.
The object-side surface S5 of the third lens element L3 is concave along the optical axis, and the image-side surface S6 is convex along the optical axis.
The object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis.
The object-side surface S9 of the fifth lens element L5 is concave along the optical axis, and the image-side surface S10 is convex along the optical axis.
The object-side surface S11 of the sixth lens element L6 is convex along the optical axis, and the image-side surface S12 is convex along the optical axis.
The object-side surface and the image-side surface of each of the first lens L1 to the sixth lens L6 are aspheric, and aspheric design can solve the problem of distortion of the field of view, and can realize excellent optical effects even when the lenses are small, thin, and flat, thereby providing the optical system 100 with miniaturization characteristics.
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 made of plastic, and the plastic lenses can reduce the weight of the optical system 100 and reduce the production cost.
The parameters of the optical system 100 are given in table 6, table 7 and table 8, and the definitions of the parameters can be derived from the first embodiment, which is not described herein.
TABLE 6
TABLE 7
TABLE 8
Based on the above provided parameter information, the following relationships can be deduced:
referring to fig. 13, in some embodiments, the optical system 100 and the photosensitive element 210 are assembled to form the image capturing 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 may be disposed between the sixth lens L6 and the photosensitive element to prevent the infrared light from interfering with the visible light image. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal oxide semiconductor). By using the optical system 100, the image pickup module 200 will have a telephoto capability.
In some embodiments, the distance between the photosensitive element 210 and each lens in the optical system 100 is relatively fixed, and the image capturing module 200 is a fixed focus module. In other embodiments, a driving element such as a voice coil motor may be provided to enable the photosensitive element 210 to move relative to each lens in the optical system 100, so as to achieve a focusing effect. Specifically, the driving element may drive the lens barrel carrying each lens of the optical system 100 to move to implement the focusing function described above. In some embodiments, an algorithm may also be collocated to control at least one lens in the optical system 100 to move relative to other lenses, thereby achieving an optical zoom effect.
Referring to fig. 14, the camera module 200 may be applied to the terminal device 30, for example, a terminal device with a camera function, such as a smart phone, a smart watch, a tablet computer, a vehicle (e.g., smart driving), an unmanned aerial vehicle, a game machine, a PDA (Personal Digital Assistant), a home appliance, and the like. By adopting the camera module 200, the terminal device 30 will have a telephoto capability. Specifically, when the camera module 200 is applied to the smart phone, the camera module 200 can be used as a front camera module of the smart phone, and the camera module 200 at this time can be a fixed focus module. When the camera module 200 is used as a rear camera module of the smart phone 10, the camera module 200 may be a module capable of focusing. In addition, in some embodiments, a camera module having a telephoto function and a camera module having a wide-angle camera function may also be installed in the terminal device 30 at the same time, so that a user may select different camera functions.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical system comprising, in order from an object side to an image side:
the optical lens comprises a first lens element with positive refractive power, a second lens element with positive refractive power, a third lens element with negative refractive power, and a fourth lens element with positive refractive power, wherein the object-side surface and the image-side surface of the first lens element are convex;
the second lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
a third lens element with negative refractive power;
a fourth lens element with negative refractive power;
a fifth lens element with negative refractive power; and
a sixth lens element with positive refractive power.
2. The optical system of claim 1, comprising an aperture stop, wherein the aperture stop satisfies any one of:
the aperture diaphragm is arranged on the object side of the first lens;
the aperture diaphragm is arranged between the first lens and the sixth lens;
the aperture stop is located on a surface of any one of the first lens to the sixth lens.
3. The optical system according to claim 1, characterized in that the following relation is satisfied:
2.0≤FNO≤10.0；
the FNO is an f-number of the optical system.
4. The optical system of claim 1, wherein the object side surface of the sixth lens is convex.
5. The optical system according to claim 1, characterized in that the following relation is satisfied:
0.75≤TTL/f≤1.25；
TTL is the total optical length of the optical system, and f is the effective focal length of the optical system.
6. The optical system according to claim 1, characterized in that the following relation is satisfied:
0.51≤TLENS/TTL≤0.71；
TLENS is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, and TTL is the total optical length of the optical system.
7. The optical system according to claim 1, characterized in that the following relation is satisfied:
0.16≤f1/f≤0.59；
f1 is the focal length of the first lens, and f is the effective focal length of the optical system.
8. An image capturing module comprising a photosensitive element and the optical system of any one of claims 1 to 7, wherein the photosensitive element is disposed on the image side of the sixth lens element.
9. The camera module of claim 8, wherein the following relationship is satisfied:
1≤TTL/IMA≤3；
TTL is the total optical length of the optical system, and IMA is the diagonal distance of the effective pixel area of the photosensitive element.
10. A terminal device characterized by comprising the camera module of claim 8 or 9.
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| CN201921733180.9U CN210720851U (en) | 2019-10-16 | 2019-10-16 | Optical system, camera module and terminal equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650726A (en) * | 2020-07-10 | 2020-09-11 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN111650727A (en) * | 2020-07-10 | 2020-09-11 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN112904582A (en) * | 2021-02-19 | 2021-06-04 | 南昌欧菲光电技术有限公司 | Optical lens assembly, optical module and equipment |
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2019
- 2019-10-16 CN CN201921733180.9U patent/CN210720851U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111650726A (en) * | 2020-07-10 | 2020-09-11 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN111650727A (en) * | 2020-07-10 | 2020-09-11 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| US20220011543A1 (en) * | 2020-07-10 | 2022-01-13 | Genius Electronic Optical (Xiamen) Co., Ltd. | Optical imaging lens |
| CN111650727B (en) * | 2020-07-10 | 2022-04-08 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| US11635583B2 (en) | 2020-07-10 | 2023-04-25 | Genius Electronic Optical (Xiamen) Co., Ltd. | Optical imaging lens |
| CN112904582A (en) * | 2021-02-19 | 2021-06-04 | 南昌欧菲光电技术有限公司 | Optical lens assembly, optical module and equipment |
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Effective date of registration: 20210628 Address after: 330096 no.1404, Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi Jinghao optics Co.,Ltd. Address before: 330013 Nanchang, Jiangxi economic and Technological Development Zone, east of lilac Road, north of Longtan canal. Patentee before: NANCHANG OFILM OPTICAL-ELECTRONIC TECH Co.,Ltd. |