Receiving lens, receiving module, ranging device and electronic device

Abstract

Embodiments of the present application disclose a receiving lens, a receiving module, a ranging device and an electronic device. The receiving lens satisfies the following conditions: 2mm < f < 3.5mm; D > 3mm. The embodiments of the present application limit the receiving aperture of the receiving lens to be greater than 3mm, that is, the receiving aperture of the receiving lens is large, so as to increase the signal receiving area of the detector, and further to improve the receiving power and the detection distance of the ranging device. The total effective focal length of the receiving lens is limited to be greater than 2mm and less than 3.5mm, that is, the receiving lens with a small focal length is adopted, and the total imaging area formed by the detection units of the detector is generally fixed, so that the total effective focal length of the receiving lens is small, and the total receiving field angle of the receiving lens is improved. In summary, the receiving lens of the present application has the characteristics of large receiving field angle and large receiving aperture, and the detection distance is wide.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photoelectric detection, and in particular to a receiving lens, a receiving module, a ranging device and an electronic device. BACKGROUND

[0002] In related technologies, a ranging device generally obtains distance, speed and direction of an object by using the difference between an emitted light signal output by a light emitting source and a return light signal received by a detector, and the ranging device generally shoots the emitted light signal to a detection area through a transmitting lens and receives the return light signal through a receiving lens.

[0003] However, the receiving aperture of the receiving lens in related technologies is small, resulting in a small effective receiving area of the detector and a decline in the detection performance of the ranging device. SUMMARY

[0004] The present application provides a receiving lens, a receiving module, a ranging device and an electronic device, which are used to solve the problem of a small receiving aperture of the receiving lens in related technologies, resulting in a small effective receiving area of the detector and a decline in the detection performance of the ranging device.

[0005] In a first aspect, the present application provides a receiving lens for transmitting a return light signal, wherein the receiving lens satisfies the following conditional expression:

[0006] 2mm < f < 3.5mm; D > 3mm;

[0007] wherein D is the receiving aperture of the receiving lens, and f is the total effective focal length of the receiving lens.

[0008] Optionally, 3.2mm < f < 3.5mm; F / # ≤ 1; wherein F / # is the aperture coefficient of the receiving lens.

[0009] Optionally, the receiving lens is used for transmitting a return light signal, and the receiving lens is used for beam shrinking and focusing processing on the return light signal.

[0010] Optionally, the receiving lens comprises a beam shrinking lens assembly and a converging lens assembly arranged along the light path of the return light signal; the beam shrinking lens assembly comprises at least one lens for reducing the total receiving field of view angle of the return light signal; and the converging lens assembly comprises at least one lens for focusing the return light signal with the reduced field of view angle after the beam shrinking lens assembly on a detector.

[0011] Optionally, the receiving lens satisfies the following conditional expression:

[0012] 11mm < f1 < 13mm;

[0013] 6mm < f2 < 8mm;

[0014] wherein, f1 is the total effective focal length of the condensing lens assembly; and f2 is the total effective focal length of the converging lens assembly.

[0015] Optionally, the condensing lens assembly comprises a first lens and a second lens arranged along the optical path of the echo optical signal.

[0016] Optionally, the receiving lens satisfies the following conditional expression: -6mm < f 11 <-5mm; 8mm < f 12 <9mm; wherein, f 11 is the effective focal length of the first lens; f 12 is the effective focal length of the second lens; D 11 is the effective aperture of the first lens; and / or,

[0017] the receiving lens satisfies the following conditional expression: 11mm < D 11 <12mm; 8mm < D 12 <9mm; wherein, D 12 is the effective aperture of the second lens; D 21 is the effective aperture of the third lens.

[0018] Optionally, the converging lens assembly comprises a third lens, a fourth lens, a fifth lens and a sixth lens arranged along the optical path of the echo optical signal.

[0019] Optionally, the receiving lens satisfies the following conditional expression: -78mm < f 21 <-77mm; 13mm < f 22 <14mm; -7mm < f 23 <-76mm; 13mm < f 24 <14mm; wherein, f 21 is the effective focal length of the third lens; f 22 is the effective focal length of the fourth lens; f 23 is the effective focal length of the fifth lens; f 24 is the effective focal length of the sixth lens; and / or,

[0020] the receiving lens satisfies the following conditional expression: 8mm < D 21 <9mm; 9mm < D 22 <10mm; 9mm < D 23 <10mm; 9mm < D 24 <10mm; wherein, D 22 is the effective aperture of the fourth lens; D 23 is the effective aperture of the fifth lens; D24 an effective aperture of the sixth lens.

[0021] Optionally, the receiving lens satisfies the following conditional expression:

[0022] RI>85%;|Dis|<58%;

[0023] wherein, RI is a relative luminance of the receiving lens; Dis is a distortion of the receiving lens, and |Dis| is an absolute value of the distortion of the receiving lens.

[0024] In a second aspect, an embodiment of the present application provides a receiving module, comprising:

[0025] the receiving lens described above;

[0026] a detector configured to receive the echo light signal passing through the receiving lens.

[0027] In a third aspect, an embodiment of the present application provides a ranging device, comprising:

[0028] a transmitting module comprising a light source and a transmitting lens, the light source being configured to output a transmitting light signal, and the transmitting lens being configured to emit the transmitting light signal to a detection region;

[0029] the receiving module described above, the receiving lens of the receiving module being configured to receive an echo light signal reflected by a target object in the detection region and transmit the echo light signal to the detector.

[0030] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising:

[0031] the ranging device described above;

[0032] a mounting member configured to mount the ranging device to the electronic device.

[0033] The receiving lens, the receiving module, the ranging device and the electronic device of the present application limit the receiving aperture of the receiving lens to be greater than 3 mm, that is, the receiving aperture of the receiving lens is relatively large, so as to increase the occupied area of the echo light signal on the detector after passing through the receiving lens, that is, to increase the signal receiving area of the detector, and further to improve the receiving power and the detection distance of the ranging device. The total effective focal length of the receiving lens is limited to be greater than 2 mm and less than 3.5 mm, that is, the receiving lens with a smaller focal length is used, and the total imaging area formed by the detection units of the detector is generally fixed, so that the receiving lens with a smaller total effective focal length is selected, so as to improve the total receiving field angle of the receiving lens. In summary, the receiving lens of the present application can increase the receiving field angle without changing the total imaging area of the detection units of the detector, so as to ensure that the receiving aperture is large enough and improve the ranging performance of the ranging device. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a structural diagram of the ranging device provided in the embodiments of this application;

[0036] Figure 2 This is a graph showing the variation of the relative illumination of the receiving lens in the ranging device provided in this application embodiment at the half-receiving field of view.

[0037] Figure 3 This is a graph showing the variation of the distortion of the receiving lens in the ranging device provided in this application embodiment at the half receiving field of view.

[0038] Figure 4 This is a graph showing the variation of the modulation transfer function of the receiving lens in the ranging device provided in this application at spatial frequency.

[0039] Figure 5 This is a structural diagram of a receiving lens in a ranging device provided in an embodiment of this application;

[0040] Figure 6 This is another structural diagram of the receiving lens in the ranging device provided in the embodiments of this application;

[0041] Figure 7 This is a structural diagram of the receiving module in the ranging device provided in the embodiments of this application;

[0042] Figure 8 This is a simulated structural diagram of the receiving lens in the ranging device provided in the embodiments of this application;

[0043] Figure 9 This is another structural diagram of the receiving lens in the ranging device provided in the embodiments of this application. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0045] The following description relates to the drawings, where like elements are referred to with like numbers. The implementations described in the following examples do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0046] Embodiment One

[0047] The present embodiment provides a receiving lens 11. Please refer to Figure 1 The receiving lens 11 can be used to transmit the echo light signal. More specifically, the receiving lens 11 can be used in the receiving module 10 to receive the echo light signal and converge the echo light signal on the detector 12 of the receiving module 10.

[0048] The receiving module 10 is generally used in cooperation with a transmitting module 20, which includes a light emitting source 21 for emitting a transmitting light signal to a detection area. The receiving lens 11 of the receiving module 10 is used to receive an echo light signal reflected by a target object in the detection area and converge the echo light signal on the detector 12. The detector 12 converts the echo light signal into an electric signal and sends it to a signal processing system. The signal processing system compares the transmitting light signal and the echo light signal after appropriate processing, and can obtain the distance, speed, direction, and other related information of the object in the detection area. After the power of the light emitting source 21 and the photoelectric conversion efficiency of the detector 12 are determined, the measurement distance of the distance measuring device 1 composed of the transmitting module 20 and the receiving module 10 is mainly limited by the receiving aperture of the receiving lens 11 in the receiving module 10. The larger the receiving aperture, the larger the effective receiving area on the detector 12 and the higher the receiving power.

[0049] For example, the distance measuring device 1 composed of the transmitting module 20 and the receiving module 10 generally satisfies the following condition formula: γ P γ = η θ I γ Ω α 2 η γ ρ T P t A t A γ cosθ / πR 2 A l ; where P γ is the power of the echo light signal received on the detector 12; η γ is the receiving efficiency of the receiving lens 11; I θ is the radiation intensity of the light signal reaching the detector 12 after transmission through the atmosphere; Ω γ is the solid angle subtended to the target; τ αis the single-pass transmittance of the optical signal in the atmosphere; P t is the output power of the light emitting source 21; A t is the projection area of the irradiated part of the target object in the cross-sectional direction of the emitted optical signal; A γ is the effective receiving area of the detector 12; θ is the angle between the optical axis of the emission lens 22 in the emission module 20 and the normal of the target object; R is the distance between the target object and the distance measuring device 1; A l is the cross-sectional area of the emitted optical signal at the target object. According to the above condition formula, the larger the effective receiving area A γ of the detector 12, the larger the power P γ of the echo optical signal received on the detector 12. However, in the related art, the receiving aperture of the receiving lens 11 with a large field of view is relatively small, and it is difficult to simultaneously consider a large field of view and a large receiving aperture.

[0050] To solve the above problems, the receiving lens 11 provided in the embodiments of the present application satisfies the following conditions:

[0051] The receiving aperture D of the receiving lens 11 is greater than 3 mm, that is, the receiving aperture D of the receiving lens 11 is large, so that the area occupied by the echo optical signal on the detector 12 after passing through the receiving lens 11 can be increased, that is, the signal receiving area of the detector 12 can be increased, and thus the receiving power and the detection distance of the distance measuring device 1 can be improved.

[0052] Further, the total effective focal length f of the receiving lens 11 is greater than 2 mm and less than 3.5 mm, that is, the total effective focal length f of the receiving lens 11 is small. The receiving lens 11 generally satisfies the following condition formula one: h = f*tanθ, wherein h is the size of the total imaging surface formed by the detection units of the detector 12, and the unit is mm; θ is the total receiving field of view of the receiving lens 11, and 0 < θ < π. The total imaging area h formed by the detection units of the detector 12 is generally fixed. In combination with the above condition formula one, if the receiving lens 11 with a small total effective focal length f is selected, the total receiving field of view θ of the receiving lens 11 can be improved. Through reasonable limitation of the receiving aperture D of the receiving lens 11 and the total effective focal length f of the receiving lens 11, the receiving lens 11 can increase the receiving field of view without changing the size of the total imaging surface formed by the detection units of the detector 12, so as to ensure that the size of the receiving aperture is as large as possible, ensure the imaging quality of the receiving lens 11, and improve the detection distance of the distance measuring device 1.

[0053] Further, the receiving lens 11 of the present application limits the total effective focal length f and the receiving aperture D, so that when the number of lenses included in the receiving lens 11 is six or less, the distance measuring performance of the distance measuring device 1 is still good, the size of the distance measuring device 1 can be greatly reduced, the miniaturization design can be easily realized, and the manufacturing cost can be reduced.

[0054] More specifically, the total effective focal length f of the receiving lens 11 is greater than 3.2mm and less than 3.5mm, and the aperture coefficient F / # of the receiving lens 11 is less than or equal to 1. The receiving lens 11 generally satisfies the following condition (Equation 2): F / # = f / D. In this embodiment, the aperture coefficient F / # of the receiving lens 11 is designed to be less than or equal to 1. Compared to the aperture coefficients of 1.8 to 2.4 used in related technologies, the aperture coefficient F / # is extremely small, thus allowing the receiving aperture D of the receiving lens 11 to be larger than that of the prior art. Combined with the total effective focal length f being greater than 3.2mm and less than 3.5mm, the receiving lens 11 of this embodiment can achieve a receiving aperture D greater than 3mm while ensuring a sufficiently large total receiving field of view θ.

[0055] Optionally, in this embodiment of the application, the total receiving field of view θ of the receiving lens 11 can satisfy 120°*30° while achieving a receiving aperture D greater than 3mm.

[0056] It should be noted that the aperture coefficient F / # of the receiving lens 11 provided in this application embodiment is less than or equal to 1. Compared with the aperture coefficients of 1.8 to 2.4 used in the receiving lens 11 in the related art, the aperture coefficient is extremely small. The smaller the aperture coefficient F / #, the more lenses the receiving lens 11 includes. Therefore, the F / # of this application embodiment is preferably greater than or equal to 0.5 and less than or equal to 1, so that the number of lenses included in the receiving lens 11 can be six or less.

[0057] The curve showing the relative illumination RI of receiving lens 11 as a function of the half-receiving field of view is as follows: Figure 2 As shown, Figure 2 The horizontal axis represents the half-receiving field of view of the receiving lens 11, and the vertical axis represents the relative illumination of the receiving lens 11. Figure 2 It can be seen that the relative illumination RI of the receiving lens 11 in this embodiment of the application is greater than 85% throughout the entire receiving field of view, which is beneficial to improve the edge field of view illumination and enhance the imaging effect of the receiving lens in low light environment.

[0058] The distortion Dis of receiving lens 11 as a function of half receiving field of view is shown in the curve. Figure 3 As shown, Figure 3 The horizontal axis represents the distortion of the receiving lens 11, and the vertical axis represents the half-field-of-view angle of the receiving lens 11. Figure 3 It can be seen that the absolute value of the distortion |Dis| of the receiving lens 11 in this embodiment of the application is less than 58% throughout the entire receiving field of view, which is beneficial to improve the distortion phenomenon at the edge field of view and improve the imaging quality of the receiving lens.

[0059] The curve of the modulation transfer function MTF of the receiving lens 11 along the spatial frequency sp under the whole receiving field of view is shown in FIG. 9. Figure 4 Figure 4 The horizontal coordinate is the spatial frequency sp, in lp / mm (i.e., for line / mm), and the vertical coordinate is the modulation transfer function MTF, specifically the MTF value when the receiving field of view is 120°, Sagittal represents the sagittal direction, and Tangential represents the tangential direction. Figure 4 It can be seen that the modulation transfer function MTF of the receiving lens 11 of the embodiment of the present application is greater than 0.73@20 lp / mm, which can ensure that the receiving aperture is greater than 3 mm in the case of increasing the receiving field of view.

[0060] In an exemplary scheme, the detector 12 can include a plurality of detection units distributed in a two-dimensional array, each detection unit forming an imaging surface (or pixel surface), and the plurality of imaging surfaces formed by the plurality of detection units forming the total imaging surface of the detector 12. The size h of the total imaging surface formed by the detection units in the detector 12 includes the lateral size h X of the total imaging surface; accordingly, the total receiving field of view θ of the receiving lens 11 includes the lateral field of view θ X of the receiving lens 11. The size h of the total imaging surface formed by the detection units in the detector 12 also includes the longitudinal size h Y of the total imaging surface; accordingly, the total receiving field of view θ of the receiving lens 11 also includes the longitudinal field of view θ Y of the receiving lens 11.

[0061] In another exemplary scheme, the size h of the total imaging surface formed by the detection units in the detector 12 also includes the diagonal size f D of the total imaging surface; accordingly, the total receiving field of view θ of the receiving lens 11 also includes the diagonal field of view θ D of the receiving lens 11.

[0062] Optionally, the receiving lens 11 can be used for beam shrinking and focusing processing of the echo light signal. More specifically, referring to FIG. 10, Figure 5 the receiving lens 11 can include a beam shrinking lens assembly 111 and a converging lens assembly 112 arranged along the optical path of the echo light signal. The beam shrinking lens assembly 111 includes at least one lens for shrinking the total receiving field of view of the echo light signal. The converging lens assembly 112 includes at least one lens for focusing the echo light signal with the field of view shrunk by the beam shrinking lens assembly 111 on the detector 12.

[0063] ​More specifically, the beam-reducing lens assembly 111 reduces the total receiving field angle of the echo light signal by deflecting the light rays of the echo light signal; and the detector 12 is located at the image-side focal plane of the converging lens assembly 112, and is configured to focus the light signal with the reduced field angle on the detector 12.

[0064] Optionally, the receiving lens 11 satisfies the following condition formula three: 11mm < f1 < 13mm; 6mm < f2 < 8mm; wherein, f1 is the total effective focal length of the beam-reducing lens assembly 111; and f2 is the total effective focal length of the converging lens assembly 112.

[0065] It should be noted that the receiving lens 11 satisfies the following condition formula four: wherein, is the optical power, and d is the distance between the beam-reducing lens assembly 111 and the converging lens assembly 112. In the case where the total effective focal length f of the receiving lens 11, the total effective focal length f1 of the beam-reducing lens assembly 111, and the total effective focal length f2 of the converging lens assembly 112 are known, the distance d between the beam-reducing lens assembly 111 and the converging lens assembly 112 can be calculated in combination with the above condition formula four, so as to realize the design of the receiving lens 11.

[0066] Optionally, the beam-reducing lens assembly 111 comprises a first lens 1111 and a second lens 1112 arranged along the optical path of the echo light signal. More specifically, the receiving lens 11 satisfies the following condition formula five: -6mm < f 11 <-5mm; 8mm < f 12 <9mm; wherein, f 11 is the effective focal length of the first lens 1111; f 12 is the effective focal length of the second lens 1112; and / or, the receiving lens 11 satisfies the following condition formula six: 11mm < D 11 <12mm; 8mm < D 12 <9mm; wherein, D 11 is the effective aperture of the first lens 1111; D 12 is the effective aperture of the second lens 1112.

[0067] Optionally, the converging lens assembly 112 comprises a third lens 1121, a fourth lens 1122, a fifth lens 1123, and a sixth lens 1124 arranged along the optical path of the echo light signal. More specifically, the receiving lens 11 optionally satisfies the following condition formula seven: -78mm < f 21 <-77mm; 13mm < f 22 <14mm; -7mm < f 23 <-76mm; 13mm < f 24 <14mm; wherein, f21 is an effective focal length of the third lens 1121; f 22 is an effective focal length of the fourth lens 1122; f 23 is an effective focal length of the fifth lens 1123; f 24 is an effective focal length of the sixth lens 1124; and / or, the receiving lens 11 satisfies the following conditional expression eight: 8mm < D 21 < 9mm; 9mm < D 22 < 10mm; 9mm < D 23 < 10mm; 9mm < D 24 < 10mm; wherein, D 21 is an effective aperture of the third lens 1121; D 22 is an effective aperture of the fourth lens 1122; D 23 is an effective aperture of the fifth lens 1123; D 24 is an effective aperture of the sixth lens 1124.

[0068] Optionally, in combination with the above-mentioned conditional expression three, conditional expression four and conditional expression five, the interval d1 between the first lens 1111 and the second lens 1112 can be calculated. Similarly, in combination with the above-mentioned conditional expression three, conditional expression four and conditional expression seven, the interval d2 between the third lens 1121 and the fourth lens 1122, the interval d3 between the fourth lens 1122 and the fifth lens 1123, and the interval d4 between the fifth lens 1123 and the sixth lens 1124 can be calculated.

[0069] It should be noted that the receiving lens 11 also satisfies the following conditional expression nine: f m = (n m -1) * (1 / r m1 -1 / r m2 ); wherein, m = 1, 2, 3…m, respectively corresponding to the first lens 1111, the second lens 1112, the third lens 1121… the mth lens arranged along the optical path of the echo light signal in the receiving lens 11; f m is an effective focal length of each lens; n m is an effective refractive index of each lens; r m1 is a radius of curvature of the object side of each lens, in mm; r m2 is a radius of curvature of the image side of each lens, in mm.

[0070] For example, when m = 1, corresponding to the first lens 1111 of the receiving lens 11, f m corresponds to the effective focal length of the first lens 1111; n m corresponds to the effective refractive index of the first lens 1111; r m1 corresponds to the radius of curvature of the object side of the first lens 1111; rm2 The curvature radius of the image side of the first lens 1111. That is, the effective focal length, the effective refractive index, the curvature radius of the object side, and the curvature radius of the image side of each lens satisfy the above condition formula nine, so that the structure of each lens can be designed in combination with the above condition formula nine.

[0071] The number of lenses included in the condensing lens assembly 112 is not limited, as long as it can focus the echo light signal on the detector 12. The combination form of the receiving lens 11 has the characteristics of diversification, which can meet more use requirements.

[0072] Optionally, referring to Figure 6 , the receiving lens 11 further includes a lens barrel 113 for mounting the condensing lens assembly 111 and the condensing lens assembly 112. The lens barrel 113 is provided with a first mounting cavity 1131, and the condensing lens assembly 111 and the condensing lens assembly 112 are mounted in the first mounting cavity 1131.

[0073] In order to facilitate the installation and positioning of each lens in the condensing lens assembly 111 and / or each lens in the condensing lens assembly 112 in the first mounting cavity 1131, the receiving lens 11 can further include a stop ring 114 mounted in the first mounting cavity 1131, so that when each lens in the condensing lens assembly 111 and / or each lens in the condensing lens assembly 112 is installed in the first mounting cavity 1131, it can abut against the stop ring 114 to achieve positioning. Optionally, the stop ring 114 can be mounted in the first mounting cavity 1131 by gluing or the like. In another exemplary scheme, a protrusion can also be formed directly on the inner circumferential wall of the lens barrel 113 to position the installation position of the lens.

[0074] When the receiving lens 11 includes two or more lenses, the size of the stop ring 114 can be designed so that the two adjacent lenses can abut against the two opposite end faces of the stop ring 114, respectively, so that the distance between the two lenses reaches a predetermined distance.

[0075] Optionally, the inner circumferential wall of the stop ring 114 can be provided with a plurality of light extinction teeth 1141. The light extinction teeth 1141 can be used to increase the reflection times of the echo light signal irradiated onto the stop ring 114, weaken the light intensity of the echo light signal transmitted backward after passing through the stop ring 114, that is, weaken the light intensity of the interference light signal, and improve the ranging accuracy of the ranging device 1.

[0076] Optionally, when the receiving lens 11 includes two or more lenses, as long as there is a gap between the outer circumferential non-optical part of the two adjacent lenses, a blocking ring 114 can be arranged at the gap to achieve the fixation of the lens in the first mounting cavity 1131 and the spacing between the two adjacent lenses to reach the preset spacing through the blocking ring 114.

[0077] Optionally, the outside of the lens barrel 113 can be provided with a mounting part 1132, so that the receiving lens 11 can be connected with other structures through the mounting part 1132. Optionally, the mounting part 1132 and the lens barrel 113 can be an integral structure to reduce the assembly process and improve the assembly efficiency of the receiving lens 11.

[0078] Optionally, the receiving lens 11 further includes a light shield 115 connected to the light-in side of the lens barrel 113, for avoiding the crosstalk of light between the receiving lens 11 and other optical structures. The light shield 115 can be any device with light shielding performance such as light shielding coating, light shielding sheet, etc., and the embodiments of the present application do not make any limitation thereon.

[0079] In an exemplary scheme, the light shield 115 and the lens barrel 113 can be directly connected through clamping, interference, etc. In another exemplary scheme, the light shield 115 and the lens barrel 113 can be connected through another connecting piece 116, which can be sleeved on the periphery of the lens barrel 113 and the light shield 115, and connected with the lens barrel 113 and the light shield 115 through interference fit, etc.

[0080] In a second aspect, the embodiments of the present application further provide a receiving module 10, please refer to Figure 7 The receiving module 10 includes the receiving lens 11 and the detector 12 described above, and the detector 12 is used to receive the echo light signal passing through the receiving lens 11.

[0081] Optionally, the receiving module 10 further includes a receiving board 13 for carrying the detector 12, and the receiving board 13 is electrically connected with the detector 12 for providing power supply signal, electrical signal, etc. for the detector 12.

[0082] Optionally, the receiving module 10 further includes a mounting seat 14, and the mounting seat 14 is provided with a second mounting cavity 141, and part of the receiving board 13 can be located in the second mounting cavity 141 and carry the detector 12, and part of the receiving board 13 can be located outside the mounting seat 14 for connecting with the external connector.

[0083] Optionally, the mounting seat 14 is connected with the lens barrel 113 to realize an integrated structure of the receiving module 10. More specifically, the mounting seat 14 can include a first mounting portion 142 close to the lens barrel 113 and a second mounting portion 143 away from the lens barrel 113, the second mounting cavity 141 can include a first sub-mounting cavity 1421 on the first mounting portion 142 and a second sub-mounting cavity 1431 on the second mounting portion 143, and the first sub-mounting cavity 1421 can be in communication with the second sub-mounting cavity 1431. The first mounting portion 142 can be sleeved on the periphery of the lens barrel 113, and the second mounting portion 143 can be used for mounting the detector 12, part of the circuit board and other structures.

[0084] Optionally, the receiving module 10 can further include an optical filter 15 in front of the detector 12, which is used to filter out interference light in the echo light signal to the detector 12, so as to improve the signal-to-noise ratio of the detector 12 and further improve the accuracy of the information of the target object in the detection area.

[0085] In a third aspect, the embodiments of the present application provide a ranging device 1, which will be described again with reference to Figure 1 The ranging device 1 includes the transmitting module 20 and the receiving module 10 described above, the transmitting module 20 includes a light source 21 and a transmitting lens 22, the light source 21 is used to output a transmitting light signal, and the transmitting lens 22 is used to emit the transmitting light signal to the detection area. The receiving lens 11 of the receiving module 10 is used to receive an echo light signal reflected by a target object in the detection area and transmit the echo light signal to the detector 12.

[0086] The transmitting module 20 further includes a transmitting plate 23 for carrying the light source 21, the transmitting plate 23 is electrically connected with the light source 21 and is used to provide a power supply signal, an electrical signal and the like for the light source 21.

[0087] In a fourth aspect, the embodiments of the present application provide an electronic device, which includes the ranging device 1 described above and a mounting member. The mounting member is used to mount the ranging device 1 to the electronic device.

[0088] In an exemplary scheme, the electronic device is a laser radar, the light emitting source 21 includes one or more laser sources, and the plurality of laser sources are arranged in one dimension or two dimensions; and in actual application, the laser source can be a continuous light emitting source or a pulsed light emitting source; the laser source can be one or a combination of a light emitting diode (LED), a laser diode (LD), a vertical cavity surface emitting laser (VCSEL), etc., and the embodiment is not limited by the type of laser source; the detection unit in the detector 12 is a laser detector 12, and the number of laser detectors 12 can be one or more; the plurality of laser detectors 12 are arranged in an array. The laser detector 12 can be one or a combination of an avalanche photodiode (APD), a silicon photomultiplier (SiPM), a multi-pixel photon counter (MPPC), etc.

[0089] In another exemplary scheme, the electronic device can also be a mobile phone, a computer, or any device with photoelectric detection function, and the embodiment of the application does not limit this.

[0090] Among them, the mounting member can be a shell or a bracket, etc. with assembly function, used for mounting the distance measuring device 1 on the electronic device.

[0091] Embodiment two

[0092] The difference between this embodiment and embodiment one is that please refer to Figure 8 and Figure 9 When designing the receiving lens 11, a large size virtual imaging surface 30 is designed, so that the receiving aperture is large when the light reaches the virtual imaging surface 30 from the receiving lens 11, and then a microlens 40 is arranged at the virtual imaging surface 30 to make the image on the virtual imaging surface 30 fall on the actual photoelectric detector 12.

[0093] Among them, the position of the virtual imaging surface 30 can be simulated in software, and then the microlens 40 is designed at the position of the simulated virtual imaging surface 30. That is, the microlens 40 and the receiving lens 11 are combined to form a lens assembly of the receiving module 10, so that the focal length and the receiving aperture of the combined lens assembly change, and then the receiving field of view is increased without changing the size of the total imaging surface formed by the detection unit of the detector 12, so that the size of the receiving aperture is as large as possible, the imaging quality of the receiving lens 11 is guaranteed, and the detection distance of the distance measuring device 1 is improved.

[0094] The above descriptions are only the preferred embodiment of the application, of course, cannot be used to limit the scope of the application, thus the equivalent variations made by the claims of the application, still belongs to the scope of the application covered.

Claims

1. A receiving lens characterized by, The receiving lens is used for transmitting a return light signal, the receiving lens comprises less than six lenses, the receiving lens comprises a beam-reducing lens assembly and a converging lens assembly arranged along an optical path of the return light signal, the beam-reducing lens assembly comprises a first lens and a second lens arranged along the optical path of the return light signal, the converging lens assembly comprises a third lens, a fourth lens, a fifth lens and a sixth lens arranged along the optical path of the return light signal, and the receiving lens satisfies the following conditional expressions: 3.2mm < f < 3.5mm; D > 3mm; F / # ≤ 1; wherein f is a total effective focal length of the receiving lens, D is a receiving aperture of the receiving lens, and F / # is an aperture ratio of the receiving lens.

2. The receiving lens according to claim 1, characterized in that, The receiving lens satisfies the following conditional expressions: 11mm < f1 < 13mm; 6mm < f2 < 8mm; wherein f1 is a total effective focal length of the beam-reducing lens assembly, and f2 is a total effective focal length of the converging lens assembly.

3. The receiving lens of claim 1, wherein The receiving lens satisfies the following conditional expression: -6mm < f 11 < -5mm; 8mm < f 12 < 9mm; wherein f 11 is an effective focal length of the first lens; f 12 is an effective focal length of the second lens; D 11 is an effective aperture of the first lens; and / or, The receiving lens satisfies the following conditional expression: 11mm < D 11 < 12mm; 8mm < D 12 < 9mm; wherein D 12 is an effective aperture of the second lens; D 21 is an effective aperture of the third lens.

4. The receiving lens of claim 1, wherein The receiving lens satisfies the following conditional expression: -78mm < f 21 < -77mm; 13mm < f 22 < 14mm; -7mm < f 23 < -76mm; 13mm < f 24 < 14mm; wherein f 21 is an effective focal length of the third lens; f 22 is an effective focal length of the fourth lens; f 23 is an effective focal length of the fifth lens; f 24 is an effective focal length of the sixth lens; and / or, The receiving lens satisfies the following conditional expressions: 8mm < D 21 < 9mm; 9mm < D 22 < 10mm; 9mm < D 23 < 10mm; 9mm < D 24 < 10mm; wherein D 22 is an effective aperture of the fourth lens; D 23 is an effective aperture of the fifth lens; and D 24 is an effective aperture of the sixth lens.

5. The receiving lens according to any one of claims 1 to 4, wherein The receiving lens satisfies the following conditional expressions: RI > 85%; |Dis| < 58%; wherein RI is a relative luminance of the receiving lens, Dis is a distortion of the receiving lens, and |Dis| is an absolute value of the distortion of the receiving lens.

6. A receiving module, characterized in that The receiving lens comprises: The receiving lens of any one of claims 1 to 5; A detector configured to receive the return light signal transmitted through the receiving lens.

7. A ranging device, characterized by The receiving lens comprises: A transmitting module comprising a light source and a transmitting lens, the light source being configured to output a transmitting light signal, and the transmitting lens being configured to transmit the transmitting light signal to a detection region; The receiving module of claim 6, wherein the receiving lens of the receiving module is configured to receive a return light signal reflected by a target object in the detection region and transmit the return light signal to the detector.

8. An electronic device, comprising: The ranging device comprises: The ranging device of claim 7; A mounting member configured to mount the ranging device to the electronic device.

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