Optical collimating mirror structure

Abstract

The utility model provides an optical collimating lens structure. The optical collimating lens structure comprises a TOF chip, a collimating lens seat, a transmitting optical lens, a receiving optical lens and a fixing module. One end of the transmitting light through hole and one end of the receiving light through hole are both communicated with the fixing cavity in one side of the collimating lens base, the other end of the transmitting light through hole is communicated with the transmitting packaging cavity, the other end of the receiving light through hole is communicated with the receiving packaging cavity, and the fixing module is fixedly connected to the side, away from the fixing cavity, of the collimating lens base. One end of the transmitting optical lens and one end of the receiving optical lens are both connected with the fixing module, the other end of the transmitting optical lens is arranged in the transmitting packaging cavity, and the other end of the receiving optical lens is arranged in the receiving packaging cavity. According to the optical collimating lens structure, the transmitting optical lens and the receiving optical lens are connected through the fixing module and are both connected with the collimating lens base, the overall structure is stable, the relative positions of the transmitting optical lens and the receiving optical lens with the collimating lens base are very accurate, the product precision is high, and the quality is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser ranging equipment field, especially optical collimating mirror structure. BACKGROUND

[0002] TOF chip (Time of Flight, flight time chip) is a kind of sensor chip based on time-of-flight principle, mainly used to measure the distance between object and sensor.Collimating mirror is a kind of optical element for changing light beam into parallel light or quasi-parallel light, collimating mirror can convert divergent light beam into parallel light beam, or converge approximately parallel light beam.TOF chip and collimating mirror are often used in laser ranging, 3D imaging, obstacle avoidance system and other fields, and the core is to realize high-precision, high-efficiency distance measurement through the combination of optical design and signal processing.

[0003] With the wide application of TOF technology in consumer electronics (such as smart phones, AR / VR devices), micro robots, medical endoscopes and other fields, the miniaturization demand of collimating mirror is increasingly urgent, and the optical collimating mirror structure with small volume requires high manufacturing precision.The optical collimating mirror structure in the prior art has poor structural strength due to small volume, and the relative position of optical lens and collimating mirror seat is prone to deviation, resulting in low product precision and poor product quality.

[0004] Therefore, it is necessary to provide an optical collimating mirror structure to solve the above technical problems. UTILITY MODEL CONTENT

[0005] The utility model provides an optical collimating mirror structure to solve the problem of low precision and poor quality of the optical collimating mirror structure in the prior art.

[0006] To solve the above technical problems, the technical scheme of the utility model is as follows: an optical collimating mirror structure, comprising a TOF chip, a collimating mirror seat, a transmitting optical lens, a receiving optical lens and a fixing module.

[0007] The collimating mirror seat comprises a fixing cavity on one side for fixing the TOF chip, and a transmitting light hole, a receiving light hole, a transmitting packaging cavity and a receiving packaging cavity, one end of the transmitting light hole and one end of the receiving light hole are communicated with the fixing cavity, the other end of the transmitting light hole is communicated with the transmitting packaging cavity, and the other end of the receiving light hole is communicated with the receiving packaging cavity, the fixing module is fixedly connected on the side of the collimating mirror seat away from the fixing cavity, one end of the transmitting optical lens is connected with the fixing module, the other end of the transmitting optical lens is arranged in the transmitting packaging cavity, one end of the receiving optical lens is connected with the fixing module, and the other end of the receiving optical lens is arranged in the receiving packaging cavity.

[0008] In the utility model, the length of the fixed cavity is 4.35-4.48 mm, the width of the fixed cavity is 2.35-2.45 mm, and the depth of the fixed cavity is 0.9-1.1 mm.

[0009] Preferably, the length of the fixed cavity is 4.4 mm, the width of the fixed cavity is 2.4 mm, and the depth of the fixed cavity is 1.0 mm.

[0010] In the utility model, the emission optical lens is in a circular truncated cone structure, one end of the emission optical lens with a smaller outer diameter is connected with the emission packaging cavity, and the minimum inner diameter of the emission packaging cavity is greater than the inner diameter of the emission light transmission hole;

[0011] The depth of the emission light transmission hole is 2.21-2.91 mm, and the inner diameter of the emission light transmission hole is 1.5-1.8 mm.

[0012] Preferably, the depth of the emission light transmission hole is 2.91 mm, and the inner diameter of the emission light transmission hole is 1.8 mm.

[0013] In the utility model, the incident surface of the emission optical lens is a plane, and the emergent surface of the emission optical lens is a convex surface with a curvature radius of 2.1589-2.6413 mm;

[0014] The emission optical lens is in a circular truncated cone structure, the optical effective aperture of the incident surface of the emission optical lens is 1.48-1.8 mm, and the optical effective aperture of the emergent surface of the emission optical lens is 2.2-2.5 mm.

[0015] The thickness of the emission optical lens is 2.59 mm.

[0016] Preferably, the optical effective aperture of the incident surface of the emission optical lens is 1.8 mm, and the optical effective aperture of the emergent surface of the emission optical lens is 2.5 mm.

[0017] In the utility model, the hole center distance between the emission light transmission hole and the receiving light transmission hole is 3.0 mm, and the center axis distance between the emission optical lens and the receiving optical lens is 3.0 mm.

[0018] In the utility model, the emission optical lens comprises an emission lens body and an emission fixing block, and the receiving optical lens comprises a receiving lens body and a receiving fixing block.

[0019] The emission fixing block is integrally connected to the side of the emission lens body away from the receiving optical lens, and the inner wall of the emission light transmission hole is provided with an emission fixing groove corresponding to the emission fixing block.

[0020] The receiving fixed block is integrally formed and connected to one side of the receiving lens body away from the transmitting optical lens, and the inner wall of the receiving light hole is provided with a receiving fixed groove corresponding to the receiving fixed block.

[0021] In the utility model, the fixed module, the transmitting optical lens and the receiving optical lens are integrally formed structures, the transmitting optical lens and the receiving optical lens are polymethyl methacrylate materials with a refractive index of 1.49, and the outer surfaces of the fixed module are all frosted.

[0022] Compared with the prior art, the optical collimator structure of the utility model has the beneficial effects that: the optical collimator structure of the utility model connects the transmitting optical lens and the receiving optical lens through the fixed module, and both are connected with the collimator seat, the overall structure is stable, the relative positions of the transmitting optical lens and the receiving optical lens and the collimator seat are very accurate, and the product has high precision and good quality. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiments are briefly introduced as follows, and the drawings in the following description are only corresponding drawings of part of the embodiments of the utility model.

[0024] Figure 1 It is a structural schematic view of the preferred embodiment of the optical collimator structure of the utility model.

[0025] Figure 2 It is one of the exploded structural schematic views of the optical collimator structure of the utility model.

[0026] Figure 3 It is the second exploded structural schematic view of the optical collimator structure of the utility model.

[0027] Figure 4 It is a sectional view of the optical collimator structure of the utility model. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] The terms of direction mentioned in the utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side surface", "top" and "bottom" and the like, are only the orientation of the attached drawings, and the terms of direction are used to explain and understand the utility model, and not to limit the utility model.

[0030] In the utility model, unless another explicit provision and limitation, the terms "mount", "connect", "connect", "fix" and the like should be understood broadly, for example, the connection can be detachable connection, or the connection of integral structure, can be direct connection, or indirect connection through intermediate medium, can be the communication inside two elements or the interaction relationship of two elements.

[0031] The optical collimating mirror structure in the prior art has the problems of low product precision and poor product quality due to small volume, poor structural strength, and deviation of the relative position of the optical lens and the collimating mirror seat.

[0032] The following is a preferred embodiment of an optical collimating mirror structure provided by the utility model to solve the above technical problems.

[0033] Please refer to Figure 1 , Figure 2 and Figure 3 , in the drawings, the units with similar structures are denoted by the same reference numerals.

[0034] The embodiment provides an optical collimating mirror structure, which comprises a TOF chip 11, a collimating mirror seat 12, an emitting optical lens 13, a receiving optical lens 14 and a fixing module 15.

[0035] The TOF chip 11 can be a TOF chip VL5300 of Nanjing Chipview Microelectronics Technology Co., Ltd., a TOF chip VL53L0X of STMicroelectronics China, or a TOF chip DA0301 of Sunplus (Shanghai) Microelectronics Technology Co., Ltd.

[0036] The collimating mirror seat 12 comprises a fixing cavity 123 on one side for fixing the TOF chip 11, and an emitting light hole 121, a receiving light hole 122, an emitting packaging cavity 124 and a receiving packaging cavity 125, one end of the emitting light hole 121 and one end of the receiving light hole 122 are communicated with the fixing cavity 123, the other end of the emitting light hole 121 is communicated with the emitting packaging cavity 124, and the other end of the receiving light hole 122 is communicated with the receiving packaging cavity 125.

[0037] The fixed module 15 is fixedly connected to the collimating mirror seat 12 away from the fixed cavity 123. One end of the transmitting optical lens 13 is connected to the fixed module 15, and the other end of the transmitting optical lens 13 is arranged in the transmitting packaging cavity 124. One end of the receiving optical lens 14 is connected to the fixed module 15, and the other end of the receiving optical lens 14 is arranged in the receiving packaging cavity 125.

[0038] The laser emitted by the TOF chip 11 passes through the transmitting light hole 121 and the transmitting optical lens 13, and the laser returned after external reflection passes through the receiving optical lens 14 and the receiving light hole 122 and is received by the TOF chip 11.

[0039] The fixed module 15 in the embodiment has a circular rectangular shape in the radial cross section, so that a smaller distance can be provided between the transmitting optical lens 13 and the receiving optical lens 14, the fixed module 15 can maintain a higher structural strength, and the fixed module 15 can stably support the transmitting optical lens 13 and the receiving optical lens 14.

[0040] Please refer to Figure 3 In the embodiment, the length of the fixed cavity 123 is 4.35-4.48 mm, the width of the fixed cavity 123 is 2.35-2.45 mm, and the depth of the fixed cavity 123 is 0.9-1.1 mm.

[0041] Preferably, the length of the fixed cavity 123 is 4.4 mm, the width of the fixed cavity 123 is 2.4 mm, and the depth of the fixed cavity 123 is 1.0 mm.

[0042] Please refer to Figure 2 and Figure 4 In the embodiment, the transmitting optical lens 13 has a circular truncated cone structure, one end of the transmitting optical lens 13 with a smaller outer diameter is connected to the transmitting packaging cavity 124, the minimum inner diameter of the transmitting packaging cavity 124 is greater than the inner diameter of the transmitting light hole 121, so that a shoulder is formed between the transmitting packaging cavity 124 and the transmitting light hole 121, and the end face of the transmitting optical lens 13 is in positioning contact with the shoulder. The depth of the transmitting light hole 121 is 2.21-2.91 mm, and the inner diameter of the transmitting light hole 121 is 1.5-1.8 mm.

[0043] It should be noted that the receiving optical lens 14 has a circular truncated cone structure, one end of the receiving optical lens 14 with a smaller outer diameter is connected to the receiving packaging cavity 125, the minimum inner diameter of the receiving packaging cavity 125 is greater than the inner diameter of the receiving light hole 122, so that a shoulder is formed between the receiving packaging cavity 125 and the receiving light hole 122, and the end face of the receiving optical lens 14 is in positioning contact with the shoulder.

[0044] Preferably, the depth of the transmitting light hole 121 is 2.91 mm, and the inner diameter of the transmitting light hole 121 is 1.8 mm.

[0045] Please refer to Figure 4 In the embodiment, the incident surface of the transmitting optical lens 13 is a plane, and the exit surface of the transmitting optical lens 13 is a convex surface with a radius of curvature of 2.1589-2.6413 mm.

[0046] The optical effective aperture of the incident surface of the transmitting optical lens 13 is 1.48-1.8 mm, and the optical effective aperture of the exit surface of the transmitting optical lens 13 is 2.2-2.5 mm.

[0047] The thickness of the transmitting optical lens 13 is 2.59 mm.

[0048] Preferably, the optical effective aperture of the incident surface of the transmitting optical lens 13 is 1.8 mm, and the optical effective aperture of the exit surface of the transmitting optical lens 13 is 2.5 mm.

[0049] In addition, the exit surface of the receiving optical lens 14 is a plane, and the incident surface of the receiving optical lens 14 is a convex surface with a radius of curvature of 2.1589-2.6413 mm. The optical effective aperture of the exit surface of the receiving optical lens 14 is 1.48-1.8 mm, and the optical effective aperture of the incident surface of the receiving optical lens 14 is 2.2-2.5 mm.

[0050] The thickness of the receiving optical lens 14 is 2.59 mm.

[0051] Preferably, the optical effective aperture of the exit surface of the receiving optical lens 14 is 1.8 mm, and the optical effective aperture of the incident surface of the receiving optical lens 14 is 2.5 mm.

[0052] Please refer to Figure 4 In the embodiment, the center distance of the transmitting light hole 121 and the receiving light hole 122 is 3.0 mm, and the center distance between the center axis of the transmitting optical lens 13 and the center axis of the receiving optical lens 14 is 3.0 mm, so the volume is small.

[0053] Please refer to Figure 2 In the embodiment, the transmitting optical lens 13 includes a transmitting lens body and a transmitting fixing block 131, and the receiving optical lens 14 includes a receiving lens body and a receiving fixing block 141.

[0054] The transmitting fixing block 131 is integrally connected to the side of the transmitting lens body away from the receiving optical lens 14, and the inner wall of the transmitting light hole 121 is provided with a transmitting fixing groove 1211 corresponding to the transmitting fixing block 131.

[0055] The receiving fixing block 141 is integrally connected to the side of the receiving lens body away from the transmitting optical lens 13, and the inner wall of the receiving light hole 122 is provided with a receiving fixing groove 1221 corresponding to the receiving fixing block 141.

[0056] The cooperation of the emitting fixed block 131 and the emitting fixed groove 1211, and the cooperation of the receiving fixed block 141 and the receiving fixed groove 1221 make the connection stability of the emitting optical lens 13, the receiving optical lens 14 and the collimating mirror seat 12 high, and the relative position accuracy high.

[0057] In the embodiment, the fixed module 15, the emitting optical lens 13 and the receiving optical lens 14 are integrally formed. The emitting optical lens 13 and the receiving optical lens 14 are polymethyl methacrylate materials with a refractive index of 1.49 (i.e. Poly(methyl methacrylate), abbreviated as PMMA). The polymethyl methacrylate material is also called acrylic or organic glass, which is an important plastic polymer material developed early and has good transparency, chemical stability and weather resistance.

[0058] The outer surfaces of the fixed module 15 are ground, such as Figure 2 As shown in the figure, the outer surfaces of the fixed module 15 include the top surface and the side surface of the fixed module 15, the outer side surface of the emitting fixed block 131, the outer side surface of the receiving fixed block 141, and the inner wall surface 151 of the groove formed between the emitting optical lens 13 and the fixed module 15, the inner wall surface 152 of the groove formed between the receiving optical lens 14 and the fixed module 15. The ground treatment makes the light transmittance of the fixed module 15 poor, and the external light is not easy to enter the emitting optical lens 13 and the receiving optical lens 14 through the fixed module 15. In this way, the molding accuracy of the middle emitting lens body and the receiving lens body can be improved.

[0059] The working principle of the utility model: when manufacturing the optical collimating mirror structure, the integral structure of the emitting optical lens 13, the receiving optical lens 14 and the fixed module 15 is manufactured first, the structure is stable, then the integral structure of the emitting optical lens 13, the receiving optical lens 14 and the fixed module 15 is placed in the mold to manufacture the collimating mirror seat 12 by injection molding. And the collimating mirror seat 12, the optical lens 13, the receiving optical lens 14 and the fixed module 15 are connected as an integral structure, and the position accuracy of the emitting optical lens 13 and the receiving optical lens 14 relative to the collimating mirror seat 12 is high. Then the TOF chip 11 is fixed in the fixed cavity 123 of the collimating mirror seat 12.

[0060] The laser emitted by the TOF chip 11 passes through the emitting light hole 121 and the emitting optical lens 13, and the laser returned after external reflection passes through the receiving optical lens 14 and the receiving light hole 122 and is received by the TOF chip 11.

[0061] The optical collimator structure of the preferred embodiment connects the emitting optical lens and the receiving optical lens through the fixed module, and both are connected with the collimator seat, the overall structure is stable, the relative positions of the emitting optical lens and the receiving optical lens and the collimator seat are very accurate, and the product has high precision and good quality.

[0062] In addition, the horizontal visual angle of the optical collimator structure of the preferred embodiment is up to 1.68 degrees at the center value of 50%, the horizontal visual angle is up to 1.71 degrees at the center value of 10%, the vertical visual angle is up to 1.03 degrees at the center value of 50%, and the vertical visual angle is up to 1.06 degrees at the center value of 10%, so the optical collimator structure can achieve better divergence angle parameters.

[0063] In summary, although the utility model has disclosed the above-mentioned preferred embodiment, the above-mentioned preferred embodiment is not used to limit the utility model, and the ordinary skilled in the art can make various changes and decorations without departing from the spirit and scope of the utility model, so the protection scope of the utility model is subject to the range defined by the claims.

Claims

1. An optical collimating lens structure, characterized in that, It includes a TOF chip, a collimating lens mount, a transmitting optical lens, a receiving optical lens, and a fixing module; The collimating lens mount includes a fixing cavity located on one side for fixing the TOF chip, as well as an emission light-transmitting aperture, a receiving light-transmitting aperture, an emission packaging cavity, and a receiving packaging cavity. One end of the emission light-transmitting aperture and one end of the receiving light-transmitting aperture are both connected to the fixing cavity. The other end of the emission light-transmitting aperture is connected to the emission packaging cavity, and the other end of the receiving light-transmitting aperture is connected to the receiving packaging cavity. The fixing module is fixedly connected to the side of the collimating lens mount away from the fixing cavity. One end of the emission optical lens is connected to the fixing module, and the other end of the emission optical lens is disposed in the emission packaging cavity. One end of the receiving optical lens is connected to the fixing module, and the other end of the receiving optical lens is disposed in the receiving packaging cavity.

2. The optical collimating lens structure according to claim 1, characterized in that, The length of the fixing cavity is 4.35-4.48 mm, the width of the fixing cavity is 2.35-2.45 mm, and the depth of the fixing cavity is 0.9-1.1 mm.

3. The optical collimating lens structure according to claim 2, characterized in that, The length of the fixing cavity is 4.4 mm, the width of the fixing cavity is 2.4 mm, and the depth of the fixing cavity is 1.0 mm.

4. The optical collimating lens structure according to claim 1, characterized in that, The emitting optical lens has a frustum-shaped structure. The end of the emitting optical lens with a smaller outer diameter is connected to the emitting encapsulation cavity. The minimum inner diameter of the emitting encapsulation cavity is larger than the inner diameter of the emitting light-passing hole. The depth of the light-emitting aperture is 2.21-2.91 mm, and the inner diameter of the light-emitting aperture is 1.5-1.8 mm.

5. The optical collimating lens structure according to claim 4, characterized in that, The depth of the light-emitting aperture is 2.91 mm, and the inner diameter of the light-emitting aperture is 1.8 mm.

6. The optical collimating lens structure according to claim 1, characterized in that, The incident surface of the emitting optical lens is a plane, and the exit surface of the emitting optical lens is a convex surface with a radius of curvature of 2.1589-2.6413 mm. The effective optical aperture of the incident surface of the emitting optical lens is 1.48-1.8 mm, and the effective optical aperture of the exit surface of the emitting optical lens is 2.2-2.5 mm. The thickness of the emitting optical lens is 2.59 mm.

7. The optical collimating lens structure according to claim 6, characterized in that, The effective optical aperture of the incident surface of the emitting optical lens is 1.8 mm, and the effective optical aperture of the exit surface of the emitting optical lens is 2.5 mm.

8. The optical collimating lens structure according to claim 1, characterized in that, The center distance between the transmitting and receiving light-transmitting apertures is 3.0 mm, and the distance between the central axis of the transmitting optical lens and the central axis of the receiving optical lens is 3.0 mm.

9. The optical collimating lens structure according to claim 1, characterized in that, The emitting optical lens includes a emitting lens body and a emitting fixing block, and the receiving optical lens includes a receiving lens body and a receiving fixing block; The transmitting fixing block is integrally formed and connected to the side of the transmitting lens body away from the receiving optical lens, and the inner wall of the transmitting light-passing hole is provided with a transmitting fixing groove corresponding to the transmitting fixing block; The receiving fixing block is integrally formed and connected to the side of the receiving lens body away from the emitting optical lens, and the inner wall of the receiving light-passing hole is provided with a receiving fixing groove corresponding to the receiving fixing block.

10. The optical collimating lens structure according to claim 1, characterized in that, The fixed module, the emitting optical lens, and the receiving optical lens are integrally formed. The emitting optical lens and the receiving optical lens are made of polymethyl methacrylate material with a refractive index of 1.

49. The outer surface of the fixed module is frosted.

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