Optical module

Abstract

An optical module comprises a carrier structure, a transmission lens assembly and an objective lens assembly, the carrier structure accommodates the transmission lens assembly and the objective lens assembly, a first accommodating structure and a second accommodating structure are arranged in the carrier structure, the first accommodating structure is used for accommodating the transmission lens assembly, and the second accommodating structure is used for accommodating the objective lens assembly. The first accommodating structure and the second accommodating structure are hollow through structures, the objective lens assembly comprises a diaphragm, an optical filter and a lens, and the diaphragm, the optical filter and the lens are respectively accommodated in the second accommodating structure. According to the optical module, the diaphragm, the optical filter and the lens in the objective lens assembly are respectively and directly accommodated in the carrier structure, and a lens barrel and a lens seat in the prior art are removed, so that the height size of the objective lens assembly and the overall size of the optical module are effectively reduced, materials are reduced, the objective lens assembly is relatively small and thin, and the cost is reduced. And the cost performance of the optical module is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the structural design technical field of optical module, in particular to an optical module. BACKGROUND

[0002] Some types of optical sensing systems include an optical transmitter that emits a beam of optical radiation toward a target and an optical receiver that collects and senses optical radiation reflected from the target. For example, in some depth sensing systems, the transmitter emits a pulse of radiation toward a target and the optical receiver senses the time of flight (TOF) of the pulse, thus measuring the distance to the target. For many sensing applications, including TOF-based depth sensing, it is common to package the transmitter and receiver together on the same substrate in a compact package.

[0003] As Figures 1 to 3 shown, in the existing TOF module, the aperture of the receiving end device is determined by the aperture originally designed for the lens in the objective lens assembly. The lens is integrated and installed in a separate lens barrel and lens seat by a plurality of lenses and a set of diaphragm pieces that determine the aperture of the lens. The transmitting module is packaged and assembled by the Chip On Board process of the vertical cavity surface emitting laser (VCSEL), the photo diode (PD), and the diffuser device. After that, the SMT (Surface Mounted Technology) is used to solder the circuit board. The transmitting module and the receiving module are assembled together using a support.

[0004] Therefore, the existing TOF module has many manufacturing process flows, high raw material input, and high relative cost. The height of the lens determines the height of the entire TOF module, resulting in a large size of the entire TOF module. Once the aperture size needs to be changed, the entire lens needs to be redesigned and manufactured, which is low in cost performance. During the module production and assembly process, the flowability of the glue causes the bottom end of the diffuser device to have glue, which causes the effective area of the diffuser device to be blocked. SUMMARY

[0005] Therefore, the utility model provides an optical module, which directly installs the lenses in the objective lens assembly, a set of diaphragm pieces that determine the aperture of the lens, and a filter in the carrier structure, effectively reduces the height size of the objective lens assembly, effectively reduces the overall size of the optical module and reduces the material, and further effectively improves the cost performance of the optical module.

[0006] An optical module comprises a carrier structure, a transmission lens assembly and an objective lens assembly, the carrier structure accommodating the transmission lens assembly and the objective lens assembly, the carrier structure being provided with a first accommodating structure and a second accommodating structure, the first accommodating structure being used for accommodating the transmission lens assembly, the second accommodating structure being used for accommodating the objective lens assembly, the first accommodating structure and the second accommodating structure being hollow through structures, the objective lens assembly comprising an aperture sheet, a filter sheet and a lens, the second accommodating structure accommodating the aperture sheet, the filter sheet and the lens respectively.

[0007] In an embodiment, the second accommodating structure comprises a first attaching groove, a second attaching groove and a third attaching groove which are in communication with each other, wherein the first attaching groove is used for attaching the aperture sheet, the second attaching groove is used for attaching the filter sheet, and the third attaching groove is used for attaching the lens.

[0008] In an embodiment, the first attaching groove is located at the top of the carrier structure.

[0009] In an embodiment, the second attaching groove and the third attaching groove are sequentially and spacedly arranged below the first attaching groove from top to bottom, and a first communication channel is arranged between the second attaching groove and the third attaching groove.

[0010] In an embodiment, a first overflow groove is arranged around the bottom of the second attaching groove close to the first communication channel, and a second overflow groove is arranged around the top of the third attaching groove close to the first communication channel, the first overflow groove and the second overflow groove being used for accommodating overflow glue around the bottom of the filter sheet and overflow glue around the top of the lens respectively.

[0011] In an embodiment, the third attaching groove and the second attaching groove are sequentially and spacedly arranged below the first attaching groove from top to bottom, and a second communication channel is arranged between the third attaching groove and the second attaching groove.

[0012] In an embodiment, a third overflow groove is arranged around the top of the second attaching groove close to the second communication channel, the third overflow groove being used for accommodating overflow glue around the top of the filter sheet.

[0013] In an embodiment, the first accommodating structure is a fourth attaching groove, and the bottom of the fourth attaching groove is provided with a third communication channel.

[0014] In an embodiment, a fourth overflow groove is arranged around the bottom of the fourth attaching groove close to the third communication channel, the fourth overflow groove being used for accommodating overflow glue around the bottom of the transmission lens assembly.

[0015] In an embodiment, the carrier structure is an integrally formed structure.

[0016] The optical module provided by the utility model directly contains the diaphragm sheet, the optical filter and the lens in the objective assembly in the carrier structure, removes the lens barrel and the lens seat in the prior art, effectively reduces the height size of the objective assembly and the overall size of the optical module, reduces the material, makes the objective assembly smaller and thinner, and further effectively improves the performance-price ratio of the optical module. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained according to these drawings without creative labor.

[0018] Figure 1 The partial structure of the TOF module in the prior art is schematically shown.

[0019] Figure 2 The partial structure of the TOF module in the prior art is schematically shown.

[0020] Figure 3 The partial structure of the TOF module in the prior art is schematically shown.

[0021] Figure 4 The overall structure of the optical module of the first embodiment of the utility model is schematically shown.

[0022] Figure 5 The overall structure of the optical module of the first embodiment of the utility model is schematically shown.

[0023] Figure 6 The partial enlarged structure of Figure 5 is schematically shown.

[0024] Figure 7 And Figure 8 The structure of the diaphragm sheet in the first embodiment of the utility model is schematically shown.

[0025] Figure 9 The overall structure of the optical module of the second embodiment of the utility model is schematically shown.

[0026] Figure 10 The overall structure of the optical module of the second embodiment of the utility model is schematically shown. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and are not all the embodiments. Based on the description of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0028] In the description of the present application, unless otherwise explicitly specified and limited, the terms "provided", "provided with", "provided in" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0029] The terms "in", "bottom", "top" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0031] The terms "first", "second", "third", "fourth" and the like are only for distinguishing similar attributes of elements, and do not indicate or imply relative importance or a particular order.

[0032] First embodiment

[0033] As Figures 4 to 6 shown, the optical module of the first embodiment of the present application comprises a carrier structure 11, a transmission lens assembly 12 and an objective lens assembly 13, the carrier structure 11 accommodates the transmission lens assembly 12 and the objective lens assembly 13, the carrier structure 11 is provided with a first accommodating structure 14 and a second accommodating structure 15, the first accommodating structure 14 is used for accommodating the transmission lens assembly 12, the second accommodating structure 15 is used for accommodating the objective lens assembly 13, the first accommodating structure 14 and the second accommodating structure 15 are both hollow through structures, the objective lens assembly 13 comprises an iris sheet 131, an infrared filter 132 and a lens 133, the second accommodating structure 15 accommodates the iris sheet 131, the infrared filter 132 and the lens 133 respectively.

[0034] According to the optical module of the first embodiment of the present application, the diaphragm sheet 131, the infrared filter 132 and the lens 133 in the objective lens assembly 13 are directly accommodated in the carrier structure 11 respectively, the lens barrel and the lens seat in the prior art are removed, the height dimension of the objective lens assembly 13 and the overall dimension of the optical module are effectively reduced, the material is reduced, the objective lens assembly 13 is smaller and thinner, and the performance-price ratio of the optical module is effectively improved.

[0035] As Figure 5 and Figure 6 shown, specifically, in the present embodiment, the second accommodating structure 15 comprises the first attaching groove 151, the second attaching groove 152 and the third attaching groove 153 which are communicated with each other, wherein the first attaching groove 151 is used for attaching the diaphragm sheet 131, the second attaching groove 152 is used for attaching the infrared filter 132, and the third attaching groove 153 is used for attaching the lens 133. Specifically, the second accommodating structure 15 with the above structure can effectively reduce the height and the overall dimension of the objective lens assembly 13, and can well fix and install the objective lens assembly 13. Specifically, the lens 133 can be a lens group or an integrated lens, for example, a superlens lens, and in the present embodiment, the superlens lens is preferred, so that the overall thickness of the optical module is thinner.

[0036] As Figure 5 and Figure 6 shown, specifically, in the present embodiment, the first attaching groove 151 is located at the top of the carrier structure 11. Preferably, the diaphragm sheet 131 in the objective lens assembly 13 is placed alone at the top of the carrier structure 11, as Figure 7 and Figure 8 shown, the opening size of the diaphragm sheet 131 is used to control the light amount of the objective lens assembly 13, and different aperture optical modules can be obtained by only changing the aperture of the diaphragm sheet.

[0037] As Figure 5 and Figure 6 shown, specifically, in the present embodiment, the second attaching groove 152 and the third attaching groove 153 are sequentially and spacedly arranged below the first attaching groove 151 from top to bottom, and the first communicating passage 154 is arranged between the second attaching groove 152 and the third attaching groove 153. Specifically, the infrared filter 132 is assembled above the lens 133 to filter the excess light beams.

[0038] As Figure 5 and Figure 6As shown, specifically, in the embodiment, the bottom of the second attaching groove 152 is provided with a first overflow groove 155 near the periphery of the first communicating passage 154, and the top of the third attaching groove 153 is provided with a second overflow groove 156 near the periphery of the first communicating passage 154, and the first overflow groove 155 and the second overflow groove 156 are respectively used for accommodating the overflow glue around the bottom of the infrared filter 132 and the overflow glue around the top of the lens 133. Specifically, the carrier structure 11 is increased in step difference by the first overflow groove 155 and the second overflow groove 156, which effectively avoids the overflow of glue to the bottom end of the device after the objective lens assembly 13 is assembled, thereby solving the problem that the effective area of the objective lens assembly 13 is blocked by the glue.

[0039] As shown in Figure 5 and Figure 6 As shown, specifically, in the embodiment, the first accommodating structure 14 is a fourth attaching groove, and the bottom of the fourth attaching groove is provided with a third communicating passage 141. Specifically, the first accommodating structure 14 in the above structure can well fix and install the transmission lens assembly 12, and ensure the stable and reliable working process of the transmission lens assembly 12.

[0040] As shown in Figure 5 and Figure 6 As shown, specifically, in the embodiment, the bottom of the fourth attaching groove is provided with a fourth overflow groove 142 near the periphery of the third communicating passage 141, and the fourth overflow groove 142 is used for accommodating the overflow glue around the bottom of the transmission lens assembly 12. Specifically, the carrier structure 11 is increased in step difference by the fourth overflow groove 142, which effectively avoids the overflow of glue to the bottom end of the device after the transmission lens assembly 12 is assembled, thereby solving the problem that the effective area of the transmission lens assembly 12 is blocked by the glue.

[0041] As shown in Figure 4 As shown, specifically, in the embodiment, the carrier structure 11 is a plastic support structure formed in one piece, which is stable and reliable in structure, simple in production and manufacturing, and low in cost.

[0042] Second embodiment

[0043] As shown in Figure 9 and Figure 10 As shown, specifically, the optical module of the second embodiment of the utility model comprises a first attaching groove 151, a second attaching groove 152 and a third attaching groove 153 which are in communication with each other. The first attaching groove 151 is located at the top of the carrier structure 11, and the third attaching groove 153 and the second attaching groove 152 are sequentially and spacedly arranged below the first attaching groove 151 from top to bottom, and a second communicating passage 157 is arranged between the third attaching groove 153 and the second attaching groove 152.

[0044] The first attaching groove 151 is used for attaching the diaphragm sheet 131, the second attaching groove 152 is used for attaching the infrared filter 132, and the third attaching groove 153 is used for attaching the lens 133.

[0045] According to the optical module of the second embodiment of the present application, the height of the objective lens assembly 13 and the overall size of the optical module are effectively reduced, the material is reduced, the objective lens assembly 13 is small and thin, and the performance-price ratio of the optical module is effectively improved.

[0046] As shown in Figure 9 and Figure 10 Specifically, in the present embodiment, the third overflow groove 158 is arranged at the top of the second attaching groove 152 and close to the periphery of the second communication channel 157, and the third overflow groove 158 is used for accommodating the overflow glue at the top of the infrared filter 132. Specifically, the carrier structure 11 is increased in step difference by arranging the third overflow groove 158, so that the glue overflow to the bottom end of the device after the assembly of the objective lens assembly 13 is effectively avoided, thereby solving the problem that the effective area of the objective lens assembly 13 is blocked by the glue.

[0047] According to the above embodiments, it can be seen that the optical module of the present application directly accommodates the diaphragm sheet, the infrared filter and the lens in the objective lens assembly in the carrier structure, removes the lens barrel and the lens seat in the prior art, effectively reduces the height of the objective lens assembly and the overall size of the optical module, reduces the material, makes the objective lens assembly small and thin, and effectively improves the performance-price ratio of the optical module.

[0048] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An optical module comprising a carrier structure, a transmission lens assembly and an objective lens assembly, the carrier structure accommodating the transmission lens assembly and the objective lens assembly, characterized in that, the carrier structure is provided with a first accommodating structure and a second accommodating structure, the first accommodating structure being used for accommodating the transmission lens assembly, and the second accommodating structure being used for accommodating the objective lens assembly, the first accommodating structure and the second accommodating structure being hollow through structures; the objective lens assembly comprises an aperture sheet, a filter sheet and a lens, and the second accommodating structure accommodates the aperture sheet, the filter sheet and the lens respectively.

2. The optical module according to claim 1, wherein the second accommodating structure comprises a first attaching groove, a second attaching groove and a third attaching groove which are in communication with each other; wherein, the first attaching groove is used for attaching the aperture sheet, the second attaching groove is used for attaching the filter sheet, and the third attaching groove is used for attaching the lens.

3. The optical module of claim 2, wherein, the first attaching groove is located at the top of the carrier structure.

4. The optical module according to claim 3, wherein the second attaching groove and the third attaching groove are sequentially and spacedly arranged below the first attaching groove from top to bottom, and a first communication channel is arranged between the second attaching groove and the third attaching groove.

5. The optical module according to claim 4, wherein a first overflow groove is arranged around the bottom of the second attaching groove close to the first communication channel, and a second overflow groove is arranged around the top of the third attaching groove close to the first communication channel, the first overflow groove and the second overflow groove being used for accommodating overflow around the bottom of the filter sheet and overflow around the top of the lens respectively.

6. The optical module according to claim 3, wherein the third attaching groove and the second attaching groove are sequentially and spacedly arranged below the first attaching groove from top to bottom, and a second communication channel is arranged between the third attaching groove and the second attaching groove.

7. The optical module according to claim 6, wherein a third overflow groove is arranged around the top of the second attaching groove close to the second communication channel, the third overflow groove being used for accommodating overflow around the top of the filter sheet.

8. The optical module according to any one of claims 1 to 7, wherein the first accommodating structure is a fourth attaching groove, and the bottom of the fourth attaching groove is provided with a third communication channel.

9. The optical module according to claim 8, wherein the bottom of the fourth attaching groove is provided with a fourth overflow groove around the fourth attaching groove close to the third communication channel, the fourth overflow groove being used for accommodating overflow around the bottom of the transmission lens assembly.

10. The optical module according to any one of claims 1 to 7, wherein the carrier structure is an integrally formed structure.

Images