CN210725135U - Image sensing module - Google Patents

Abstract

The utility model provides an image sensing module, it includes transmitter, receiver and rotatable optical module. The receiver is electrically connected with the transmitter. The rotatable optical module has a reflective surface. Light from the emitter is transmitted to the outside of the image sensing module through the reflecting surface, and light from the outside is transmitted to the receiver through the reflecting surface. The image sensing module of the present invention has the advantages of light weight, low cost, convenient manufacturing or high reliability.

Description

Image sensing module

Technical Field

The utility model relates to a range unit especially relates to an image sensing module.

Background

In recent years, the application range of the related art of stereoscopic image in daily life is gradually expanding in addition to the professional medical diagnosis and surgery, for example: information displays for vehicles, electronic games, multimedia entertainment, and the like, and achieve effects of self-experience by using technologies such as Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR). The stereoscopic image is generated by mainly using a multimedia device, such as a stereo camera (stereo camera), to capture image information, and then generating a depth map (depth map) of the captured scene through subsequent image processing. With the increasing popularity of augmented reality in mobile phone application software, mobile phones with stereoscopic depth sensing (3d depth sensing) technology are gradually emerging in the market. Current mobile phones are equipped with front and rear lenses. In addition to the shooting of general scenes, the requirements of face recognition (face recognition) or video communication (video communication) require that the front and rear lenses are equipped with stereo depth sensors. As a result, the mobile phone may become heavy and the cost may increase.

SUMMERY OF THE UTILITY MODEL

The utility model provides an image sensing module, it can have light in weight, with low costs, convenient preparation or the advantage of high reliability.

According to the utility model discloses an embodiment, image sensing module includes transmitter, receiver and rotatable optical module. The receiver is electrically connected with the transmitter. The rotatable optical module has a reflective surface. Light from the emitter is transmitted to the outside of the image sensing module through the reflecting surface, and light from the outside is transmitted to the receiver through the reflecting surface.

In an embodiment according to the invention, the emitter comprises a visible light source or an infrared light source.

In an embodiment according to the invention, the receiver comprises a time-of-flight sensor.

In an embodiment according to the present invention, the transmitter and the receiver are stationary during image capture.

In an embodiment according to the invention, the rotatable optical module comprises a reflective element and a rotation mechanism. The reflecting surface is a side surface of the reflecting element. The rotating mechanism is connected with the reflecting element and drives the reflecting element to rotate.

According to the utility model discloses an in the embodiment, image sensing module still includes the circuit board. The circuit board is positioned on one side of the reflecting element opposite to the reflecting surface. The transmitter and the receiver are commonly arranged on the surface of the circuit board facing the reflection element and are electrically connected through the circuit board.

In an embodiment according to the invention, the reflecting surface comprises a first reflecting surface and a second reflecting surface. The first reflecting surface and the second reflecting surface have opposite inclination directions. The image sensing module further comprises a first circuit board and a second circuit board. The first reflecting surface is positioned between the second reflecting surface and the first circuit board. The emitter is disposed on a surface of the first circuit board facing the first reflective surface. The second reflecting surface is positioned between the first reflecting surface and the second circuit board. The receiver is disposed on a surface of the second circuit board facing the second reflective surface. Light from the emitter is transmitted to the outside of the image sensing module through the first reflecting surface, and light from the outside is transmitted to the receiver through the second reflecting surface.

In an embodiment according to the present invention, the reflective element includes two inclined planes with opposite inclination directions and a reflective layer disposed on the two inclined planes. The first reflecting surface and the second reflecting surface are formed by reflecting layers arranged on the two inclined surfaces.

In an embodiment according to the invention, the reflective element comprises a first reflective element and a second reflective element separate from the first reflective element and arranged back-to-back. The first reflective surface is a surface of the first reflective element, and the second reflective surface is a surface of the second reflective element.

In an embodiment of the invention, the image sensing module further includes an optical path turning element. The optical path diversion element is located between the reflective element and the transmitter and between the reflective element and the receiver. The light from the emitter is transmitted to the outside of the image sensing module through the light path turning element and the reflecting surface in sequence, and the light from the outside is transmitted to the receiver through the reflecting surface and the light path turning element in sequence. The optical path steering element is fixed during image capture.

In an embodiment according to the present invention, by turning the reflecting surface by the rotatable optical module, depth information of different orientations can be obtained without increasing the number of transmitters or receivers. In addition, the light is led out or led in from the image sensing module by utilizing the reflecting surface, and the emitter and the receiver can be fixed during image acquisition. Therefore, the wires connected to the transmitter or the receiver do not need to be rotated with the rotation of the optical module, which helps to reduce the wear or breakage of the wires. Therefore, the image sensing module of the present invention has the advantages of light weight, low cost, convenient manufacturing or high reliability.

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A and 1B are schematic views illustrating an image sensing module according to a first embodiment of the present invention being rotated to different orientations, respectively;

fig. 2A and 2B are schematic views of an image sensing module according to a second embodiment of the present invention viewed from different angles, respectively;

fig. 3 to 8 are schematic views of an image sensing module according to a third embodiment to an eighth embodiment of the present invention, respectively.

Detailed Description

The invention can be understood by reference to the following detailed description taken in conjunction with the accompanying drawings. It is noted that the figures depict typical features of methods, structures, and/or materials used in certain embodiments. These drawings, however, should not be construed as defining or limiting the scope or nature encompassed by these embodiments. For example, the relative dimensions, thicknesses, and locations of various layers, regions, and/or structures may be reduced or exaggerated for clarity.

Directional phrases used herein include, for example: "upper", "lower", "front", "rear", "left", "right", etc., refer only to the orientation of the figures. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting. It will be understood that when an element or layer is referred to as being "disposed on" another element or layer, it can be directly on the other element or layer or intervening elements or layers may be present. In contrast, when an element or layer is referred to as being "directly on" another element or layer, there are no intervening elements or layers present between the two.

In the following embodiments, the same or similar elements will be denoted by the same or similar reference numerals, and the detailed description thereof will be omitted. In addition, the features of the different embodiments can be arbitrarily mixed and matched without departing from the spirit or conflict of the present invention, and simple equivalent changes and modifications made according to the present specification or claims are still within the scope covered by the present invention. In addition, the terms "first", "second", and the like in the description or the claims are only used for naming discrete (discrete) elements or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit of the number of elements, nor for limiting the manufacturing order or the arrangement order of the elements.

In the following embodiments, the image sensing module may be a depth sensing module, which is adapted to obtain depth information of the object to be measured. The image sensing module can be applied to an electronic device, so that the electronic device has a depth sensing function. The electronic device may be a portable device (portable device) having a display function and/or a touch function, such as a mobile phone (mobile phone), a tablet computer (tablet computer), or a notebook computer (laptop), but is not limited thereto. The electronic device may also be any device that requires a depth sensing function, such as, but not limited to, an unmanned vehicle or drone. In addition, the electronic device may be optionally provided with at least one image sensing module to acquire depth information relative to the electronic device in a specific direction or space.

Fig. 1A and 1B are schematic diagrams illustrating the image sensing module 1 according to the first embodiment of the present invention being rotated to different orientations, respectively. Referring to fig. 1A and 1B, the image sensing module 1 includes a transmitter 10, a receiver 11, and a rotatable optical module 12.

The emitter 10 is adapted to provide light L1 for depth sensing. For example, the emitter 10 may include a visible light source or an invisible light source, wherein the invisible light source may include an infrared light emitting diode or an infrared laser light source; correspondingly, the light L1 provided by the emitter 10 may include, but is not limited to, visible light or infrared light.

The receiver 11 is adapted to receive light L2 from the outside. For example, the receiver 11 may include a time of Flight (TOF) sensor that may receive, but is not limited to, a transmitter light source that transmits light reflected back after hitting an object. In an embodiment, the transmitter 10 and the receiver 11 may further comprise one or more lenses. For example, the transmitter 10 is provided with a transmitting collimating lens in the transmitting direction, and a receiving focusing lens in the receiving direction of the receiver 11, but not limited thereto.

The receiver 11 is electrically connected to the transmitter 10. For example, the image sensor module 1 may further include a circuit board 13. The receiver 11 and the transmitter 10 may be disposed on a circuit board 13 and electrically connected through the circuit board 13, and further, the circuit board 13 is connected to an electronic device, but not limited thereto.

The rotatable optical module 12 has a reflective surface SR. The light L1 from the emitter 10 is transmitted to the outside of the image sensing module 1 through the reflective surface SR, and the light L2 from the outside is transmitted to the receiver 11 through the reflective surface SR. For example, the rotatable optical module 12 may include a reflective element 120 and a rotation mechanism 122. The reflective surface SR is a side surface of the reflective element 120. In the present embodiment, the reflective element 120 is a prism, and the reflective surface SR is an inclined surface of the prism, but not limited thereto. In other embodiments, the reflective element 120 can be a mirror, a beam splitter, other elements capable of reflecting light, or a combination of at least two of the above. The rotating mechanism 122 has a rotating axis RA, and the rotating mechanism 122 is connected to the reflective element 120 and can automatically or manually drive the reflective element 120 to rotate around the rotating axis RA. For example, the rotating mechanism 122 may include a carrier plate 1220, wherein the reflective element 120 may be fixed on the carrier plate 1220. The rotating mechanism 122 can drive the supporting board 1220 to rotate around the rotation axis RA through a moving part (not shown), such as a gear, a motor, a shape memory alloy, a piezoelectric material, a magnetostrictive material, or other elements, so that the reflective surface SR of the reflective element 120 rotates around the rotation axis RA.

In the present embodiment, the circuit board 13 is disposed opposite to the side of the reflection surface SR of the reflection element 120, and the transmitter 10 and the receiver 11 are disposed on the surface S13 of the circuit board 13 facing the reflection element 120. In this configuration, the rotation axis RA of the rotating mechanism 122 can be designed to be horizontal to the optical axis (not shown) of the transmitter 10 or the optical axis (not shown) of the receiver 11. However, the relative arrangement relationship between the transmitter 10, the receiver 11 and the rotatable optical module 12 can be changed as required, for example, the image sensing module 1 can further include other elements to change the optical path, so the rotation axis RA is not limited to be coaxial with the optical axis (not shown) of the transmitter 10 and/or the optical axis of the receiver 11.

The light L1 from the emitter 10 can be transmitted to the object under test (e.g., the object under test O1 or the object under test O2) located at different directions by rotating the carrier 1220 to drive the reflection surface SR of the reflection element 120 to rotate. For example, when the depth information of the object to be measured O1 on the first side of the image sensor module 1 is to be measured, the supporting plate 1220 is rotated to turn the reflection surface SR to the object to be measured O1. In this way, the light L1 from the emitter 10 can be transmitted to the object O1 by reflection of the reflection surface SR, and the light L2 reflected by the object O1 can be transmitted to the receiver 11 by reflection of the reflection surface SR. The image sensor module 1 can analyze the time difference between the light L1 sent by the transmitter 10 and the light L2 received by the receiver 11, and then calculate the distance between the image sensor module 1 and the object O1 by the angle calibration. Similarly, when the depth information of the object to be measured O2 on the second side of the image sensor module 1 is to be measured, the supporting plate 1220 is rotated to turn the reflection surface SR to the object to be measured O2. In this way, the light L1 from the emitter 10 can be transmitted to the object O2 by reflection of the reflection surface SR, and the light L2 reflected by the object O2 can be transmitted to the receiver 11 by reflection of the reflection surface SR. The image sensor module 1 can analyze the time difference between the light L1 sent by the transmitter 10 and the light L2 received by the receiver 11, and then calculate the distance between the image sensor module 1 and the object O2 by the angle calibration.

Generally, no optical system has high requirements on the transmitter and the receiver, that is, the divergence angle of the transmitter is small, the optical power is large, and the receiving area is large enough to ensure the effective detection distance. And the energy utilization rate can be improved through the optical system, and the type selection requirement on the transmitting/receiving device is greatly reduced. While increasing the cost of the reflective element, the transmitter and receiver costs are greatly reduced and the peripheral circuitry is simplified.

Furthermore, by rotating the optical module 12 to turn its reflecting surface SR, it is possible to obtain depth information of different orientations without increasing the number of transmitters 10 or receivers 11. For example, in the embodiments of fig. 1A and 1B, the depth information of the opposite side of the image sensing module 1 can be obtained by one transmitter 10 and one receiver 11 arranged on a common board. In addition, the light is guided out or in from the image sensing module 1 by the reflective surface SR, and the transmitter 10 and the receiver 11 may be fixed during image capturing. Therefore, the wires (such as power wires and signal wires) connected to the transmitter 10 or the receiver 11 do not rotate with the rotation of the optical module 12, which helps to reduce the difficulty of disposing the wires and avoid the wear or breakage of the wires. Therefore, the image sensor module 1 has the advantages of light weight, low cost, convenient manufacturing or high reliability.

In addition, the transmitter 10 and the receiver 11 are disposed on the same side of the rotatable optical module 12, which helps to reduce the volume of the image sensing module 1, and thus helps to reduce the thickness of the electronic device to which the image sensing module 1 is applied.

Fig. 2A and 2B are schematic views of an image sensing module 1A according to a second embodiment of the present invention viewed from different angles. Referring to fig. 2A and 2B, the main differences between the image sensor module 1A and the image sensor module 1 of fig. 1A and 1B are as follows. In the image sensor module 1A, the rotatable optical module 12A includes a first reflective element 120a, a second reflective element 120b separated from the first reflective element 120a and disposed back to back, and a rotating mechanism 122A.

The first reflective element 120a has a first reflective surface SRa, the second reflective element 120b has a second reflective surface SRb, and the first reflective surface SRa and the second reflective surface SRb have opposite inclination directions. In the present embodiment, the first reflective element 120a and the second reflective element 120b are, for example, triangular columns with reflective layers RL formed on the inclined surfaces, and the first reflective surface SRa and the second reflective surface SRb are formed by the reflective layers RL disposed on the two inclined surfaces, but not limited thereto. Alternatively, the first and second reflective elements 120a and 120b may be mirrors, beam splitters, prisms, or other elements that reflect light.

In this embodiment, the rotating mechanism 122A may include a roller 1220A, wherein the first reflective element 120A and the second reflective element 120b are fixed in the roller 1220A. The rotating mechanism 122A can drive the roller 1220A to rotate around the rotation axis RA through a moving element (not shown), such as a gear, a motor, a shape memory alloy, a piezoelectric material, a magnetostrictive material, or other elements, so that the first reflective surface SRa of the first reflective element 120A and the second reflective surface SRb of the second reflective element 120b can also rotate around the rotation axis RA. In the present embodiment, the rotation axis RA, the optical axis (not shown) of the transmitter 10 and the optical axis (not shown) of the receiver 11 may be coaxial, so that the angle calibration step may be omitted when calculating the depth information.

The image sensing module 1A may further include a first circuit board 13a and a second circuit board 13 b. The first reflective surface SRa is located between the second reflective surface SRb and the first circuit board 13 a. The emitter 10 is disposed on a surface S13a of the first circuit board 13a facing the first reflection surface SRa. The second reflection surface SRb is located between the first reflection surface SRa and the second circuit board 13 b. The receiver 11 is disposed on a surface S13b of the second circuit board 13b facing the second reflection surface SRb. The light L1 from the emitter 10 is transmitted to the outside of the image sensing module 1A through the first reflection surface SRa, and the light L2 reflected by the object to be tested is transmitted to the receiver 11 through the second reflection surface SRb. Optionally, the image sensing module 1A may further include a circuit board 14. The first circuit board 13a and the second circuit board 13b are disposed on the circuit board 14, and the transmitter 10 and the receiver 11 can be electrically connected through the first circuit board 13a, the second circuit board 13b and the circuit board 14. In one embodiment, the circuit board 14 may also be electrically connected to other lines or components of the electronic device.

Fig. 3 to 8 are schematic views of an image sensing module 1B to an image sensing module 1G according to a third embodiment to an eighth embodiment of the present invention, respectively. Referring to fig. 3, the main differences between the image sensor module 1B and the image sensor module 1A shown in fig. 2A and 2B are as follows.

In fig. 2A and 2B, the first reflective surface SRa and the second reflective surface SRb are respectively located on the inclined surfaces of the two reflective elements, and the first reflective surface SRa and the second reflective surface SRb are separated from each other. In fig. 3, the first reflective surface SRa and the second reflective surface SRb are respectively located on two inclined surfaces of one reflective element, and the first reflective surface SRa and the second reflective surface SRb are connected to each other.

In detail, in the image sensing module 1B, the rotatable optical module 12B includes a reflective element 120B and a rotating mechanism 122A shown in fig. 2A and 2B. The reflective element 120B is, for example, a triangular prism having reflective layers RL formed on two inclined surfaces with opposite inclination directions, and the first reflective surface SRa and the second reflective surface SRb are formed by the reflective layers RL provided on the two inclined surfaces. Alternatively, the reflective element 120B may be a meandering mirror, but is not limited thereto.

Referring to fig. 4, the main differences between the image sensor module 1C and the image sensor module 1A shown in fig. 2A and 2B are as follows.

In the image sensor module 1C, the rotatable optical module 12C includes a first reflective element 120a, a second reflective element 120b and a rotating mechanism 122C. The first reflective element 120a and the second reflective element 120b are, for example, mirrors, but not limited thereto. The rotating mechanism 122C may include a bearing plate 1220C1, a bearing seat 1220C2, a plurality of gears (not shown), a motor, etc. The first reflective element 120a, the second reflective element 120b, the carrier 1220C2 and the plurality of gears are disposed on the carrier 1220C1, wherein the carrier 1220C2 supports the first reflective element 120a and the second reflective element 120 b. The motor can drive the gear to rotate, so that the optical module 12C rotates around the rotation axis RA, but not limited thereto.

Referring to fig. 5, the main differences between the image sensor module 1D and the image sensor module 1 of fig. 1A are as follows.

In the image sensor module 1D, the rotatable optical module 12D includes a reflective element 120 and a rotating mechanism (not shown). The rotating mechanism is connected to the reflective element 120 and can drive the reflective element 120 to rotate around the rotation axis RA. The image sensing module 1D may further include an optical path turning element 15. The optical path diversion element 15 is located between the reflection element 120 and the transmitter 10 and/or the receiver 11. The light path turning element 15 may be a prism, a mirror, a beam splitter, other elements that reflect light, or a combination of at least two of the foregoing. The light L1 from the emitter 10 sequentially passes through the optical path OP1, the optical path OP2 reflected by the optical path turning element 15, and the reflective surface SR to reflect the transmitting optical path OP3 to the outside of the image sensing module 1D (e.g., to the object O1), and the light L2 from the outside (e.g., the light reflected by the object O1) sequentially passes through the optical path OP3 ', and then the light L2 ' reflected by the reflective surface SR and the optical path OP1 ' reflected by the optical path turning element 15 are transmitted to the receiver 11.

The light is guided out or in from the image sensing module 1D by the reflective surface SR, and the transmitter 10, the receiver 11, the circuit board 13 and the optical path turning element 15 may be fixed during image capturing. Therefore, the wires (such as power lines and signal lines) connected to the transmitter 10 or the receiver 11 do not rotate with the rotation of the optical module 12D, which helps to reduce the difficulty of disposing the wires and avoid the wear or breakage of the wires. In addition, since the optical path of the optical path turning element 15 is not easily shielded by other circuit boards, the arrangement of the optical path turning element 15 is helpful to improve the flexibility of the optical design and the image capturing range.

Referring to fig. 6, the main differences between the image sensing module 1E and the image sensing module 1D of fig. 5 are as follows.

In the image sensing module 1E, the optical path turning element 15E includes a first optical path turning element 15a and a second optical path turning element 15 b. In the present embodiment, the first optical path turning element 15a and the second optical path turning element 15b are, for example, triangular columns with the reflective layer RL formed on the inclined surface, but the invention is not limited thereto. Alternatively, the first light path turning element 15a and the second light path turning element 15b may be mirrors, beam splitters, prisms, or other elements that can reflect light.

The image sensing module 1E may further include a first circuit board 13a and a second circuit board 13 b. The emitter 10 is provided on a surface S13a of the first circuit board 13a facing the first optical path deflecting element 15 a. The receiver 11 is disposed on a surface S13b of the second circuit board 13b facing the second optical path deflecting element 15 b. Optionally, the image sensing module 1E may further include a circuit board 14. The first circuit board 13a, the second circuit board 13b, the first optical path deflecting element 15a, and the second optical path deflecting element 15b are disposed on the circuit board 14, and the transmitter 10 and the receiver 11 may be electrically connected through the first circuit board 13a, the second circuit board 13b, and the circuit board 14. In one embodiment, the circuit board 14 may also be electrically connected to other lines or components of the electronic device.

Referring to fig. 7, the main differences between the image sensor module 1F and the image sensor module 1E of fig. 6 are as follows.

In the image sensor module 1F, the light path turning element 15F is, for example, a triangular prism with reflective layers RL formed on two adjacent slopes, and the reflective layers RL on the two adjacent slopes are respectively used for reflecting the light L1 from the emitter 10 to the outside by the reflective element 120 and reflecting the light L2 reflected from the external object O1 to the receiver 11 by the reflective element 120. Alternatively, the optical path turning element 15F may be a meandering mirror, but is not limited thereto.

Referring to fig. 8, the main differences between the image sensor module 1G and the image sensor module 1E of fig. 6 are as follows.

In the image sensor module 1G, the first light path turning element 15a and the second light path turning element 15b are, for example, mirrors. In addition, the image sensor module 1G further includes a carrier plate 16 and a carrier seat 17, wherein the first light path turning element 15a, the second light path turning element 15b and the carrier seat 17 are disposed on the carrier plate 16, and the carrier seat 17 supports the first light path turning element 15a and the second light path turning element 15 b.

In an embodiment according to the invention, by turning the reflecting surface by means of a rotatable optical module, depth information of different orientations can be obtained without increasing the number of transmitters or receivers. In addition, the light is led out or led in from the image sensing module by utilizing the reflecting surface, and the emitter and the receiver can be fixed during image acquisition. Therefore, the wires connected to the transmitter or the receiver do not need to rotate with the rotation of the optical module, which helps to reduce the difficulty of disposing the wires and avoid the wear or breakage of the wires. Therefore, the image sensing module of the present invention has the advantages of light weight, low cost, convenient manufacturing or high reliability. In one embodiment, the transmitter and the receiver can be disposed together on one side of the optical module to reduce the volume. In one embodiment, the transmitter and the receiver may be respectively disposed on opposite sides of the optical module, and the rotation axis of the optical module, the optical axis of the transmitter, and the optical axis of the receiver may be coaxial, so as to reduce the amount of computation in calculating the depth information. In one embodiment, the flexibility of the optical design and the image capturing range can be expanded by the arrangement of the optical path turning element.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. An image sensing module, comprising:

a transmitter;

a receiver electrically connected with the transmitter; and

the rotatable optical module is provided with a reflecting surface, wherein light from the emitter is transmitted to the outside of the image sensing module through the reflecting surface, and light from the outside is transmitted to the receiver through the reflecting surface.

2. The image sensing module of claim 1, wherein the emitter comprises a visible light source or an infrared light source.

3. The image sensing module of claim 1, wherein the receiver comprises a time-of-flight sensor.

4. The image sensing module of claim 1, wherein the transmitter and the receiver are stationary during image capture.

5. The image sensor module of claim 4, wherein the rotatable optical module includes a reflective element and a rotating mechanism, the reflective surface is a side surface of the reflective element, and the rotating mechanism is connected to the reflective element and drives the reflective element to rotate.

6. The image sensing module of claim 5, further comprising:

a circuit board disposed opposite to a side of the reflection surface of the reflection element, wherein the transmitter and the receiver are commonly disposed on a surface of the circuit board facing the reflection element and electrically connected through the circuit board.

7. The image sensor module of claim 5, wherein the reflective surface comprises a first reflective surface and a second reflective surface, the first reflective surface and the second reflective surface having opposite tilt directions, the image sensor module further comprising:

a first circuit board, wherein the first reflective surface is located between the second reflective surface and the first circuit board, the emitter being disposed on a surface of the first circuit board facing the first reflective surface; and

the second circuit board, wherein the second plane of reflection is located first plane of reflection with between the second circuit board, the receiver sets up the second circuit board faces on the surface of second plane of reflection, comes from the light of transmitter passes through first plane of reflection transmits to the outside of image sensing module, and the light that comes from the outside passes through the second plane of reflection transmits to the receiver.

8. The image sensing module of claim 7, wherein the reflective element includes two inclined planes with opposite inclination directions and a reflective layer disposed on the two inclined planes, wherein the first reflective surface and the second reflective surface are formed by the reflective layer disposed on the two inclined planes.

9. The image sensing module of claim 7, wherein the reflective element comprises a first reflective element and a second reflective element separated from the first reflective element and disposed back-to-back, the first reflective surface is a surface of the first reflective element, and the second reflective surface is a surface of the second reflective element.

10. The image sensing module of claim 5, further comprising:

and the light path turning element is positioned between the reflecting element and the emitter and between the reflecting element and the receiver, wherein the light from the emitter is transmitted to the outside of the image sensing module sequentially through the light path turning element and the reflecting surface, the light from the outside is transmitted to the receiver sequentially through the reflecting surface and the light path turning element, and the light path turning element is fixed during image acquisition.

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