CN219302747U - Lens system, receiving module and depth camera - Google Patents
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- CN219302747U CN219302747U CN202320223121.7U CN202320223121U CN219302747U CN 219302747 U CN219302747 U CN 219302747U CN 202320223121 U CN202320223121 U CN 202320223121U CN 219302747 U CN219302747 U CN 219302747U
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- 230000004075 alteration Effects 0.000 abstract description 5
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Abstract
The utility model belongs to the field of optical devices, and particularly relates to a lens system, a receiving module and a depth camera, wherein the lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along the direction from an object side to an image side of an optical axis, the first lens, the third lens and the fifth lens have negative focal power, and the second lens, the fourth lens and the sixth lens have positive focal power; two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are glass lenses, and the other four are plastic aspheric lenses. Compared with the prior art, the lens system provided by the utility model has the advantages that the focal power of six lenses is reasonably configured, the glass lens and the plastic lens are adopted to be mixed, the aspherical lens is utilized to eliminate aberration, and the imaging quality is improved, so that the lens system can have excellent optical performance on the premise of keeping a miniaturized design.
Description
Technical Field
The utility model belongs to the field of optical devices, and particularly relates to a lens system, a receiving module and a depth camera.
Background
Optical lenses are often used in imaging systems for cameras, projectors, and robots, where the working environment includes indoor and outdoor environments, and the requirements for imaging systems are increasing, which are required to simultaneously achieve a large field angle, low distortion, small volume, and suitability for operation under high and low temperature conditions. However, the existing imaging system is difficult to meet the requirements, for example, the distortion of the lens in the traditional security industry is large under a large field angle, and the field angle of the lens in the mobile phone industry is generally about 80 degrees, and the lens does not have the performance requirements under the high and low temperature conditions.
Disclosure of Invention
The utility model aims to provide a lens system, a receiving module and a depth camera, which are used for solving the technical problem that the existing lens cannot simultaneously achieve a large angle of view, low distortion and small volume.
In order to achieve the above purpose, the utility model adopts the following technical scheme: there is provided a lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in this order along a direction from an object side to an image side of an optical axis, the first lens, the third lens, and the fifth lens having negative optical power, the second lens, the fourth lens, and the sixth lens having positive optical power; two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are glass lenses, and the other four are plastic aspheric lenses.
Further, the first lens and the sixth lens are glass lenses, and the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses; or the first lens and the fourth lens are glass lenses, and the second lens, the third lens, the fifth lens and the sixth lens are plastic aspheric lenses.
Further, the lens system further includes an aperture stop; an aperture stop is located between the third lens and the fourth lens, or an aperture stop is located between the second lens and the third lens.
Further, the lens system further includes an optical filter disposed on an image side of the sixth lens.
Further, the lens system satisfies the following condition:
-2＜F 1 ＜-5；
3＜F 2 ＜8；
-8＜F 3 ＜-2；
1＜F 4 ＜4；
-6＜F 5 ＜-1.5；
10＜F 6 ＜50；
0.1＜F/TTL＜0.4；
wherein F is 1 An effective focal length of the first lens; f (F) 2 An effective focal length of the second lens; f (F) 3 An effective lens that is a third lens; f (F) 4 An effective lens that is a fourth lens; f (F) 5 An effective lens that is a fifth lens; f (F) 6 An effective lens that is a sixth lens; f is the combined focal length of the lens system; TTL is the total length of the lens system.
Further, the lens system satisfies the following condition:
FNO≤2.4；
wherein FNO is aperture value of the lens system.
Further, the lens system satisfies the following condition:
1.7＜N 1 ＜1.9；
1.5＜N 2 ＜1.7；
1.5＜N 3 ＜1.7；
1.5＜N 4 ＜1.7；
1.5＜N 5 ＜1.7；
wherein N is 1 Is the refractive index of the first lens; n (N) 2 A refractive index of the second lens; n (N) 3 Refractive index of the third lens; n (N) 4 Refractive index of the fourth lens; n (N) 5 Is the refractive index of the fifth lens.
Further, the lens system satisfies the following condition:
20＜V d2 ＜60；
20＜V d3 ＜60；
20＜V d4 ＜60；
20＜V d5 ＜60；
wherein V is d2 An abbe number of the second lens; v (V) d3 An abbe number of the third lens; v (V) d4 An abbe number of the fourth lens; v (V) d5 The abbe number of the fifth lens.
The utility model also provides a receiving module, which comprises the lens system.
The utility model also provides a depth camera, which comprises a projection module, a processor and a receiving module as described above, wherein the projection module and the receiving module are connected with the processor.
Compared with the prior art, the lens system provided by the utility model has the advantages that the focal power is reasonably configured by adopting the negative focal power, the positive focal power, the negative focal power and the positive focal power through the six lenses respectively, so that the lens system can realize high imaging performance; the glass lens and the plastic lens are mixed, so that the lens system has the advantages of good optical performance and small volume; by adopting the aspherical lens, the aberration can be effectively eliminated, the imaging quality is improved, and meanwhile, the miniaturization design of the lens system is facilitated, so that the lens system has excellent optical performance on the premise of keeping the miniaturization design.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a lens system according to an embodiment of the utility model;
fig. 2 is a schematic diagram of a second embodiment of a lens system according to the present utility model;
fig. 3 is a schematic view of an optical path structure of a lens system according to an embodiment of the present utility model;
FIG. 4 is a graph showing the modulation transfer function of a lens system according to an embodiment of the present utility model;
FIG. 5 is a graph of relative illuminance of a lens system according to an embodiment of the present utility model;
FIG. 6 is a schematic view of a defocus curve of a lens system according to an embodiment of the present utility model at room temperature;
FIG. 7 is a schematic view of a defocus curve of a lens system according to an embodiment of the present utility model at a low temperature of-20;
FIG. 8 is a schematic view of a defocus curve of a lens system according to an embodiment of the present utility model at a high temperature of 60 °;
fig. 9 is a schematic structural diagram of a depth camera according to an embodiment of the present utility model.
Wherein, each reference sign in the figure:
l1-a first lens; l2-a second lens; l3-a third lens; l4-fourth lens; l5-fifth lens; l6-sixth lens; STO-aperture stop; l7-optical filters; 10-target object; 1-a projection module; 2-a receiving module; s1-a first surface; s2-a second surface; s3-a third surface; s4-a fourth surface; s5-a fifth surface; s6-a sixth surface; s7-a seventh surface; s8-eighth surface; s9-a ninth surface; s10-a tenth surface; s11-eleventh surface; s12-a twelfth surface; s13-thirteenth surface; s14-fourteenth surface.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The utility model provides a lens system, a receiving module 2 and a depth camera, wherein the depth camera and the receiving module 2 are described below for easy understanding, and finally the lens system is further described.
Referring to fig. 9, the depth camera includes a projection module 1, a receiving module 2, and a processor (not shown); the projection module 1 and the receiving module 2 are connected with the processor; wherein the projection module 1 may comprise a projection light source consisting of one or more lasers for projecting the encoded speckle pattern into the target space, reflected back to the receiving module 2 by the target object 10 in the target space; the receiving module 2 may include an image sensor for capturing the reflected speckle pattern and processing calculations by a processor to obtain depth information of the target. The depth camera can be applied to a monocular structured light product, and also can be applied to a binocular structured light product and a Time of flight (TOF) type 3D (three-dimensional) camera.
In an embodiment, the projection module 1 may further include an emitting optical element, a driver, and the like, and the projection light source may be a light emitting diode, a laser diode, an edge emitting laser, a vertical cavity surface emitting laser, or the like, or may be a one-dimensional or two-dimensional light source array formed by a plurality of light sources. The light beam projected by the projection light source may be visible light, infrared light, ultraviolet light, or the like. The projection light source projects light outwards under the control of the driver, and the emission optical element receives the light emitted by the projection light source and projects the light to the target area after shaping.
In an embodiment, the receiving module 2 may include an image sensor and a receiving optical element; wherein the receiving optical element is configured to receive at least part of the speckle pattern reflected by the target object 10 and guide the at least part of the speckle pattern onto the image sensor, wherein the receiving optical element includes a lens system, and the image sensor may include a color sensor and a depth sensor, and when a color image collected by the color sensor is aligned with a depth image collected by the depth camera, the depth image is usually de-distorted in advance, which causes a certain loss of view angle, so that the receiving module 2 with small distortion can reduce the loss of view angle.
Referring to fig. 1, the lens system provided by the present utility model includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, which are sequentially disposed along a direction from an object side to an image side along an optical axis, wherein the first lens L1, the third lens L3 and the fifth lens L5 have negative optical power, and the second lens L2, the fourth lens L4 and the sixth lens L6 have positive optical power; two 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 glass lenses, and the other four are plastic aspherical lenses.
Compared with a plastic lens, the glass lens is more scratch-resistant, and when the glass lens is wiped with alcohol to be dirty, a film coating layer on the surface of the glass lens is less likely to separate, so that the optical performance of the lens can be ensured; compared with a glass lens, the plastic lens is formed by injection molding, so that the thickness of the center is thinner, the volume is smaller, the cost can be reduced, the total length of the lens system can be effectively reduced, and the lens system can be more flexibly applied to various miniaturized equipment, such as a service robot and the like. The glass lens and the plastic lens are mixed, so that the lens system has the advantages of both the plastic lens and the glass lens.
By adopting the aspherical lens, the aberration can be effectively eliminated, the imaging quality is improved, and meanwhile, the miniaturization design of the lens system is facilitated, so that the lens system has excellent optical effects on the premise of keeping the miniaturization design.
Compared with the prior art, the lens system provided by the utility model has the advantages that the focal power is reasonably configured by adopting the negative focal power, the positive focal power, the negative focal power and the positive focal power through the six lenses respectively, so that the lens system can realize high imaging performance; the glass lens and the plastic lens are mixed, so that the lens system has the advantages of good optical performance and small volume; by adopting the aspherical lens, the aberration can be effectively eliminated, the imaging quality is improved, and meanwhile, the miniaturization design of the lens system is facilitated, so that the lens system has excellent optical performance on the premise of keeping the miniaturization design.
More specifically, as shown in fig. 2, the first lens L1 includes a first surface S1 facing the object side and a second surface S2 facing the image side, where the first surface S1 and the second surface S2 are both convex at a paraxial region, and the first surface S1 is convex, so that light is incident into the first lens L1 at a larger angle, thereby improving the field angle of the lens system, effectively increasing the shooting range of the lens system, and thus realizing the design requirement of wide-angle shooting. The second lens L2 includes a third surface S3 facing the object side and a fourth surface S4 facing the image side, the third surface S3 is convex at a paraxial region, and the fourth surface S4 is concave at a paraxial region, so that the light passing through the first lens L1 is smoothly converged to the second lens L2 due to the positive optical power of the second lens L2, and the second lens L2 can sufficiently receive the light incident on the third surface S3 thereof. The third lens L3 includes a fifth surface S5 facing the object side and a sixth surface S6 facing the image side, and both the fifth surface S5 and the sixth surface S6 are convex at a paraxial region; the fourth lens L4 includes a seventh surface S7 facing the object side and an eighth surface S8 facing the image side, the seventh surface S7 being convex at a paraxial region and the eighth surface S8 being concave at a paraxial region; the fifth lens L5 includes a ninth surface S9 facing the object side and a tenth surface S10 facing the image side, both the ninth surface S9 and the tenth surface S10 being concave at a paraxial region; the sixth lens L6 includes an eleventh surface S11 facing the object side and a twelfth surface S12 facing the image side, and both the eleventh surface S11 and the twelfth surface S12 are convex at a paraxial region.
In an embodiment, the first lens L1 and the sixth lens L6 are glass lenses, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are plastic aspherical lenses. Since the first lens L1 and the sixth lens L6 are respectively close to the object side and the image side, the first lens L1 and the sixth lens L6 are arranged as glass lenses, so that the first lens L1 and the sixth lens L6 are more scratch-resistant, the optical performance of the first lens L1 and the sixth lens L6 is ensured, and the other lenses are arranged as plastic aspheric lenses, so that miniaturization of a lens system can be ensured, aberration can be effectively eliminated, and imaging quality is improved. It is of course understood that in other embodiments, the first lens L1 and the fourth lens L4 are glass lenses, and the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses. The setting can be specifically selected according to actual needs.
In an embodiment, the lens system further includes an aperture stop STO, and a specific position of the aperture stop STO may be matched according to a principal light angle of the image sensor, for example, when the principal light angle of the image sensor is large, the aperture stop STO may be placed between the third lens L3 and the fourth lens L4; when the main light angle of the image sensor is small, the aperture stop STO may be placed between the second lens L2 and the third lens L3.
In an embodiment, the lens system further includes an optical filter L7 disposed on the image side of the sixth lens, and the optical filter L7 is used for filtering out the background light or the stray light. The filter L7 includes a thirteenth surface S13 facing the object side and a fourteenth surface S14 facing the image side.
In one embodiment, the lens system satisfies the following condition:
-2＜F 1 ＜-5；
3＜F 2 ＜8；
-8＜F 3 ＜-2；
1＜F 4 ＜4；
-6＜F 5 ＜-1.5；
10＜F 6 ＜50；
0.1＜F/TTL＜0.4；
wherein F is 1 An effective focal length of the first lens L1; f (F) 2 An effective focal length of the second lens L2; f (F) 3 An effective lens which is the third lens L3; f (F) 4 An effective lens which is the fourth lens L4; f (F) 5 An effective lens which is the fifth lens L5; f (F) 6 An effective lens of the sixth lens L6; f is the combined focal length of the lens system; TTL is the total length of the lens system.
In one embodiment, the lens system satisfies the following condition:
FNO≤2.4；
wherein FNO is aperture value of the lens system.
In one embodiment, the lens system satisfies the following condition:
1.7＜N 1 ＜1.9；
1.5＜N 2 ＜1.7；
1.5＜N 3 ＜1.7；
1.5＜N 4 ＜1.7；
1.5＜N 5 ＜1.7；
wherein N is 1 A refractive index of the first lens L1;N 2 a refractive index of the second lens L2; n (N) 3 A refractive index of the third lens L3; n (N) 4 A refractive index of the fourth lens L4; n (N) 5 The refractive index of the fifth lens L5.
The first lens L1 is made of high-refractive-index materials, so that the problems that the process cannot be processed and the processing cost is increased due to excessive bending of the shape of the first lens L1 are solved when the large-field angle and small-distortion performance parameters are optimized. The second lens L2 to the fifth lens L5 are made of a material with a common refractive index, so that the cost of the lens system can be reduced.
In one embodiment, the lens system satisfies the following condition:
20＜V d2 ＜60；
20＜V d3 ＜60；
20＜V d4 ＜60；
20＜V d5 ＜60；
wherein V is d2 An abbe number of the second lens L2; v (V) d3 An abbe number of the third lens L3; v (V) d4 An abbe number of the fourth lens L4; v (V) d5 The abbe number of the fifth lens L5.
An exemplary design parameter for a lens system in accordance with embodiments of the present utility model will be provided below, with the understanding that the exemplary design parameter is illustrative only and that other designs based on the principles of the present utility model will be apparent to those skilled in the art upon reading embodiments of the present utility model and are therefore within the scope of the present utility model.
The following table is one exemplary lens system surface coefficient:
the aspherical curve equation of each lens is expressed as follows:
wherein z is a position value with the surface vertex as a reference at a position of height h in the optical axis direction; c is the curvature of the lens surface near the optical axis, and is the inverse of the radius of curvature, h is the perpendicular distance of the lens surface from the optical axis, k is the conic coefficient, A 4 、A 6 、A 8 、A 10 、A 12 、A 14 Is a high order aspheric coefficient. The following table is an exemplary lens system aspheric coefficient design:
in the above parameter design example, the maximum field angle of the lens system is 120 °, the focal length is 2.5mm, the aperture value is 2.5, the total optical length is 13mm, and the maximum half image height is 3.3mm; FIG. 3 is a schematic view showing the optical path structure of the lens system of the above parameter design example; FIG. 4 shows the Modulation Transfer Function (MTF) of a lens system for the above-described parameter design example; FIG. 5 shows a graph of relative illuminance of a lens system for an example of the above-described parameter design, the relative illuminance being the ratio of the image plane rim illuminance to the center illuminance; FIG. 6 shows a schematic view of the defocus curves of the lens system of the above-described parameter design example at room temperature; FIG. 7 shows a schematic view of the defocus curves of the lens system of the above-described parameter design example at low temperature-20; fig. 8 shows a schematic view of the defocus curve of the lens system of the above parameter design example at a high temperature of 60 °. As can be seen from a combination of fig. 3 to 8, the result of the above parameter design satisfies the design requirement.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. A lens system comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are disposed in this order along an optical axis in a direction from an object side to an image side, the first lens, the third lens, and the fifth lens having negative optical power, the second lens, the fourth lens, and the sixth lens having positive optical power;
wherein two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are glass lenses, and the other four are plastic aspheric lenses.
2. The lens system of claim 1, wherein the first lens and the sixth lens are glass lenses, and the second lens, the third lens, the fourth lens, and the fifth lens are plastic aspherical lenses; or,
the first lens and the fourth lens are glass lenses, and the second lens, the third lens, the fifth lens and the sixth lens are plastic aspheric lenses.
3. The lens system of claim 1, wherein the lens system further comprises an aperture stop; the aperture stop is located between the third lens and the fourth lens, or the aperture stop is located between the second lens and the third lens.
4. The lens system of claim 1, further comprising a filter disposed on an image side of the sixth lens.
5. The lens system of any one of claims 1 to 4, wherein the lens system satisfies the following condition:
-2＜F 1 ＜-5；
3＜F 2 ＜8；
-8＜F 3 ＜-2；
1＜F 4 ＜4；
-6＜F 5 ＜-1.5；
10＜F 6 ＜50；
0.1＜FTTL＜0.4；
wherein F is 1 An effective focal length of the first lens; f (F) 2 An effective focal length of the second lens; f (F) 3 An effective lens that is the third lens; f (F) 4 An effective lens that is the fourth lens; f (F) 5 An effective lens that is the fifth lens; f (F) 6 An effective lens that is the sixth lens; f is the combined focal length of the lens system; TTL is the total length of the lens system.
6. The lens system of any one of claims 1 to 4, wherein the lens system satisfies the following condition:
FNO≤2.4；
wherein FNO is aperture value of the lens system.
7. The lens system of any one of claims 1 to 4, wherein the lens system satisfies the following condition:
1.7＜N 1 ＜1.9；
1.5＜N 2 ＜1.7；
1.5＜N 3 ＜1.7；
1.5＜N 4 ＜1.7；
1.5＜N 5 ＜1.7；
wherein N is 1 A refractive index of the first lens; n (N) 2 A refractive index of the second lens; n (N) 3 A refractive index of the third lens; n (N) 4 A refractive index of the fourth lens; n (N) 5 Is the refractive index of the fifth lens.
8. The lens system of any one of claims 1 to 4, wherein the lens system satisfies the following condition:
20＜V d2 ＜60；
20＜V d3 ＜60；
20＜V d4 ＜60；
20＜V d5 ＜60；
wherein V is d2 An abbe number for the second lens; v (V) d3 An abbe number of the third lens; v (V) d4 An abbe number of the fourth lens; v (V) d5 Is the abbe number of the fifth lens.
9. A receiving module comprising a lens system according to any one of claims 1 to 8.
10. A depth camera comprising a projection module, a processor, and the receiving module of claim 9, wherein the projection module and the receiving module are both connected to the processor.
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| CN202320223121.7U CN219302747U (en) | 2023-01-18 | 2023-01-18 | Lens system, receiving module and depth camera |
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