Distance sensor assembly and head-mounted display device

Abstract

The embodiment of the utility model provides a distance sensor assembly and head-mounted display equipment. The distance sensor assembly comprises a distance sensor, a glass cover plate and a shading element, the distance sensor comprises a light emitting element used for emitting detection light in a preset emission view field; the light receiving element and the light emitting element are arranged at an interval, and the light receiving element is used for receiving reflected light after the detection light is reflected; the glass cover plate covers the distance sensor; the shading element is arranged between the distance sensor and the glass cover plate and is used for enabling the light receiving element to receive reflected light in a limited receiving view field; wherein the view field overlapping areas of the preset emission view field and the limited receiving view field are located on one side, far away from the surface, of the glass cover plate, and the far away surface is the surface, far away from the distance sensor, of the glass cover plate.

Description

Technical Field

[0001] The present disclosure relates to the field of sensor technology, and in particular to a distance sensor component and a head-mounted display device. Background Art

[0002] Head-mounted display devices usually include distance sensors for detecting whether an object is approaching, so as to realize various control functions of the head-mounted display device. The principle of the distance sensor is to emit a detection light signal, which will be reflected by the obstacle in front to form a reflected light signal. The distance sensor determines the distance of the obstacle according to the signal strength of the reflected light signal.

[0003] During the use of the head mounted display device, the glass surface of the distance sensor is prone to oil, sweat, etc. This enhances the light reflection of the glass surface of the distance sensor, causing the background noise of the distance sensor to be amplified, thereby reducing the accuracy and sensitivity of the detection. Utility Model Content

[0004] In view of this, the present disclosure provides a distance sensor assembly and a head-mounted display device.

[0005] In a first aspect, the present disclosure provides a distance sensor assembly, comprising a distance sensor, a glass cover plate and a shading element. The distance sensor comprises: a light emitting element, for emitting detection light with a preset emission field of view; a light receiving element, arranged at a distance from the light emitting element, for receiving reflected light after the detection light is reflected. The glass cover plate covers the distance sensor; the shading element is arranged between the distance sensor and the glass cover plate, for allowing the light receiving element to receive reflected light within a defined receiving field of view; wherein the overlapping area of ​​the preset emission field of view and the defined receiving field of view are both located on the side of the glass cover plate away from the surface, and the distant surface is the surface on the glass cover plate away from the side of the distance sensor.

[0006] In a second aspect, the present disclosure provides a head mounted display device, comprising: a device body and a distance sensor assembly. The distance sensor assembly is arranged on a side of the device body facing the user's head, wherein the distance sensor assembly is the distance sensor assembly provided in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the present disclosure or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0008] Figure 1 A schematic diagram of the structure of an intelligent sensor assembly provided by some embodiments of the present disclosure is shown;

[0009] Figure 2 The light provided by some embodiments of the present disclosure is shown in Figure 1 A schematic diagram of multiple reflections inside the glass cover of the smart sensor assembly shown;

[0010] Figure 3 A schematic diagram of the structure of an intelligent sensor assembly provided by some embodiments of the present disclosure is shown;

[0011] Figure 4 A schematic diagram of the structure of an intelligent sensor assembly provided by some embodiments of the present disclosure is shown;

[0012] Figure 5 A schematic diagram of the structure of an intelligent sensor assembly provided by some embodiments of the present disclosure is shown;

[0013] Figure 6 A diagram showing a principle example of determining a critical distance provided by some embodiments of the present disclosure is shown;

[0014] Figure 7 A structural block diagram of a head mounted display device provided by some implementations of the present disclosure is shown;

[0015] Figure 8 A schematic diagram of the structure of smart glasses provided in some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in the field based on the embodiments in the present disclosure should fall within the scope of protection of the embodiments of the present disclosure.

[0017] The specific implementation of the embodiment of the present disclosure is further explained below in conjunction with the accompanying drawings of the embodiment of the present disclosure.

[0018] Figure 1 FIG. 2 shows a schematic diagram of the structure of a distance sensor assembly provided by some embodiments of the present disclosure. Figure 1As shown, the distance sensor assembly 10 includes: a distance sensor 110, a glass cover plate 120 and a shading element 130. The distance sensor 110 includes a light emitting element 111 and a light receiving element 112. The light emitting element 111 is used to emit detection light in a preset emission field of view. The light receiving element is arranged at a distance from the light emitting element 111, and is used to receive the reflected light after the detection light is reflected. The glass cover plate 120 covers the distance sensor 110; the shading element 130 is arranged between the distance sensor 110 and the glass cover plate 120, and is used to allow the light receiving element 112 to receive the reflected light within the limited receiving field of view. The field of view overlap area 20 of the preset emission field of view and the limited receiving field of view are both located on the side of the glass cover plate 120 away from the surface 121, and the surface 121 is the surface of the glass cover plate 120 away from the distance sensor 110.

[0019] It should be noted that the detection light emitted by the light emitting element 111 in the embodiment of the present disclosure includes any light that can be detected, including but not limited to infrared light, ultraviolet light, and visible light. Accordingly, the light emitting element 111 includes but is not limited to an infrared light emitting element, an ultraviolet light emitting element, and a visible light emitting element; the light receiving element 112 includes but is not limited to an infrared light receiving element, an ultraviolet light receiving element, and a visible light receiving element.

[0020] Reference Figure 1 The distance sensor 110 includes a light emitting element 111 and a light receiving element 112, and the light emitting element 111 and the light receiving element 112 are arranged on the substrate at intervals. The light emitting element 111 can be a laser emitter. The light emitting element 111 emits detection light with a preset emission field of view, and the emitted detection light is reflected to form reflected light after encountering an obstacle in front. The light receiving element 112 receives the reflected light of the detection light, so that the control unit (not shown) can determine the proximity of the obstacle according to the intensity of the reflected light received by the light receiving element 112.

[0021] The glass cover 120 is made of a transparent material and covers the distance sensor 110 , thereby protecting the distance sensor 110 .

[0022] A shading element 130 is provided between the distance sensor 110 and the glass cover 120. The shading element prevents the detection light emitted by the light emitting element 111 from entering the light receiving element 112 through the gap between the glass cover 120 and the distance sensor 110, thereby forming a background noise of the distance sensor 110. Figure 1As shown, the shading element 130 is located between the light emitting element 111 and the light receiving element 112 along a first direction L1, and is located between the glass sensor and the glass cover 120 along a second direction L2 perpendicular to the first direction L1. The first direction L1 is a direction in which the light emitting element 111 and the light receiving element 112 are arranged at intervals. The first direction L1 is parallel to a plane A where the light emitting surface of the light emitting element 111 and the light incident surface of the light receiving element 112 are located. For ease of description, hereinafter, the plane where the light emitting surface of the light emitting element 111 and the light incident surface of the light receiving element 112 are located is referred to as a reference plane A. The light emitting surface refers to the surface from which light is emitted from the inside of the light emitting element 111. The light incident surface refers to the surface from which light enters the light receiving element 112 from the outside. As Figure 1 As shown, the light emitting surface of the light emitting element 111 and the light incident surface of the light receiving element 112 are surfaces of the light emitting element 111 and the light receiving element 112 facing the glass cover 120 , respectively.

[0023] In this embodiment, the light emitting element 111 has a preset emission field of view, which is determined by the light emitting element 111 itself and is a fixed value. Since the light intensity of the detection light emitted by the light emitting element 111 is usually very strong, if the detection light is irradiated on the shading element 130, when the shading element 130 is not tightly shielded, the detection light may be transmitted to the light receiving element 112, causing the data collection of the distance sensor 110 to be full scale, that is, saturated. For this reason, in this embodiment, a preset width tolerance is reserved between the emission field of view of the light emitting element 111 and the shading element. The emission field of view of the light emitting element 111 is not affected by the shading element 130, so that the light emitting element 112 can emit the detection light with a preset emission field of view.

[0024] In this embodiment, the receiving field of view of the light receiving element 112 is limited by the shading element 130, so that the light receiving element 112 can only receive reflected light from the receiving field of view defined by the shading element 130. The field of view overlap area 140 of the preset transmitting field of view and the defined receiving field of view are both located on the side of the glass cover plate 130 away from the surface 121. The away surface 121 is the surface of the glass cover plate 120 away from the side of the distance sensor 110. Figure 2As shown, the far surface 121 is the upper surface of the glass cover plate 120, and the field of view overlap area 140 of the preset emission field of view and the defined receiving field of view are both located on the upper side of the upper surface of the glass cover plate 130. This reduces the intensity of the reflected light of the detection light emitted by the light emitting element 112 with the preset emission field of view and directly reflected from the inside of the glass cover plate 130 and entering the light receiving element, and is close to 0. Therefore, when there is oil stain or sweat on the upper surface of the glass cover plate 130 so that the reflection of the detection light on the upper surface of the glass cover plate 130 is enhanced, since there is little reflected light directly reflected from the inside of the glass cover plate 130 and entering the light receiving element 112, the problem of increased background noise of the distance sensor 110 caused by the oil stain problem can be avoided, thereby improving the accuracy and sensitivity of the distance sensor assembly 10.

[0025] In some embodiments of the present disclosure, Figure 3 As shown, the distance sensor 110 may further include a colloid 113, the colloid 113 surrounds the light emitting element 111 and the light receiving element 112, and the light shielding element 130 is disposed adjacent to the colloid 113. Figure 3 As shown, the light emitting element 111 and the light receiving element 112 are packaged in the colloid 113. In order to ensure the stability of the package, the colloid 113 on the light emitting element 111 and the light receiving element 112 has a thickness b1, so the height of the surface of the colloid 113 close to the shading element 130 relative to the reference plane A in the second direction L2 is b1.

[0026] In order to prevent the detection light emitted by the light emitting element 111 from entering the light receiving element 112 through internal reflection (or multiple reflections) of the colloid 113, the colloid 113 can be structurally designed to avoid this path. Figure 2 As shown, a light shielding groove 1131 may be opened on one side of the colloid 113 adjacent to the light shielding element 130 .

[0027] In some embodiments of the present disclosure, the size of the preset emission field of view may be represented by the field of view angle or half field of view angle of the light emitting element 111. Figure 1 and Figure 3 As shown in FIG. 1 , the field of view of the light emitting element is the conical viewing angle of the light emitting element, and the half field of view of the light emitting element is equal to half of the field of view. In this embodiment, the half field of view of the light emitting element is θ 发射 In order to ensure that the emission field of the light emitting element 111 is not affected by the light shielding element 113, in some embodiments of the present disclosure, such as Figure 1 and Figure 2 As shown, the shading element 113 is configured to satisfy:

[0028]

[0029] Wherein, d is the distance from one end of the shading element close to the emission field of view to the center of the light emitting element in the first direction, and e is the height of one end of the shading element close to the emission field of view relative to the reference surface in the second direction.

[0030] Optionally, the end of the shading element 130 close to the emission field of view may refer to the end of the shading element 130 close to the emission field of view, such as Figure 1 and Figure 3 The end E1 (also referred to as the end point E1) shown in FIG. 1 is a schematic diagram of an end portion E1 of the light shielding element. In the following, for the convenience of description, it is referred to as the first end E1 of the light shielding element. The distance from the first end E1 to the center O1 of the light emitting element in the first direction L1 is represented by d. The height of the first end E1 relative to the reference surface A in the second direction L2 is represented by e. Figure 3 In the example shown, the height of the end of the shading element close to the emission field of view relative to the reference surface in the second direction is equal to the sum of the height of the first end E1 of the shading element in the second direction L2 and the thickness b1 of the colloid 113 .

[0031] when When the shading element 130 is used, a certain width of tolerance is ensured to be reserved between the first end E1 of the shading element and the edge of the preset emission field of view of the light emitting element, so that the detection light emitted by the light emitting element with the preset emission field of view will not illuminate the shading element, thereby avoiding the problem of strong detection light being transmitted to the light receiving element 112 when the shading element 130 is not tightly shielded, causing the full-scale data collection problem of the distance sensor 110.

[0032] In some embodiments of the present disclosure, the size of the limited receiving field of view of the light receiving element 112 may be represented by a half field angle or a field angle of the light receiving element 112. Figure 1 and 3 As shown, the viewing angle of the light receiving element is the conical viewing angle of the light receiving element, and the half viewing angle of the light receiving element 112 is equal to half of the viewing angle. In this embodiment, the receiving viewing field limited by light is θ 接收 The limited receiving field of view can be determined by:

[0033] θ 接收 =arctan(s / b)

[0034] Wherein, s is the distance from one end of the shading element close to the receiving field of view to the center of the light receiving element in the first direction, and b is the height of one end of the shading element close to the receiving field of view relative to the reference surface in the second direction.

[0035] Optionally, the end of the shading element 113 close to the receiving field of view may refer to the end of the shading element close to the transmitting field of view, Figure 1 and Figure 3The end E2 (also referred to as the end point E2) shown in the figure is shown in the figure. In the following, for the convenience of description, it is referred to as the second end E2 of the light shielding element. The distance from the first end E1 to the center O2 of the light receiving element in the first direction L1 is represented by s. The height of the second end E2 relative to the reference surface A in the second direction L2 is represented by b. Figure 3 As shown, the height b of the end of the shading element close to the receiving field of view relative to the reference surface in the second direction is equal to the sum of the height b2 of the second end E2 of the shading element in the second direction L2 and the thickness b1 of the colloid 113. Figure 3 In the embodiment shown, the height b of the end of the shading element close to the receiving field of view relative to the reference surface in the second direction is equal to the height e of the end of the shading element close to the transmitting field of view relative to the reference surface in the second direction. In this embodiment, since the receiving field of view can be limited by θ 接收 =arctan(s / b), therefore, when the height b is determined, the distance between the shading element and the light receiving element can be reasonably set to limit θ 接收 , ensuring that the overlapping area of ​​the preset emission field of view and the defined receiving field of view are both located on the side of the glass cover away from the surface.

[0036] based on Figure 1 and Figure 3 The distance sensor assembly shown, Figure 4 FIG. 1 is a schematic diagram of the structure of a distance sensor assembly according to an embodiment of the present disclosure. In this embodiment, the distance sensor assembly 30 also includes a distance sensor 110, a glass cover plate 120 and a shading element 130, and the structures and functions of the distance sensor 110, the glass cover plate 120 and the shading element 130 are similar to those of FIG. Figure 1 and Figure 3 The distance sensor assembly shown is similar and will not be described in detail here. In this embodiment, the shading element satisfies:

[0037] s<(l-h0×tan(θ 发射 ))×b / h0

[0038] Where l is the center distance between the light emitting element and the light receiving element, h0 is the closest distance of the field of view overlap area relative to the reference surface, θ 发射 is the half field of view angle of the preset emission field of view, s is the distance from the end of the shading element close to the receiving field of view to the center of the light receiving element in the first direction, and b is the height of the end of the shading element close to the receiving field of view relative to the reference surface in the second direction.

[0039] Optionally, the center distance between the light emitting element and the light receiving element may refer to the distance between the center O1 of the light emitting element and the center O2 of the light receiving element. Figure 4 In the figure, it is represented by l.发射 The first direction, the second direction, the reference surface, the distance s from the end of the shading element close to the receiving field of view to the center of the light receiving element in the first direction, and the height b of the end of the shading element close to the receiving field of view relative to the reference surface in the second direction can refer to the above Figure 1 and Figure 3 The embodiments shown will not be described in detail here.

[0040] Refer to the following Figure 4 and 5 For the shading element, s<(l-h0×tan(θ 发射 ))×b / h0 can ensure that the overlap area of ​​the preset emission field of view and the defined receiving field of view are both located on the side of the glass cover away from the surface. Figure 5 As shown, the point in the overlapping area of ​​the field of view whose closest distance to the reference surface is h0 is represented by B. When the closest distance of the overlapping area of ​​the field of view to the reference surface is h0, the distance from point B to the center O1 of the light emitting element in the first direction is represented by l1. Figure 5 It can be seen that l1=h0×tan(θ 发射 ), therefore, the distance from point B to the center O2 of the light receiving element in the first direction is l2=l-l1. Figure 5 It can be seen that tan(θ 临界 )=l2 / h0. Figure 5 It can also be seen that, assuming that the reflected light of the detection light emitted by the light emitting element 113 is not blocked by the light receiving element, the distance from the second end E2 of the light shielding element to the center O2 of the light receiving element in the first direction is s0. At this time, tan(θ 临界 )=s0 / b.

[0041] According to the formula tan(θ 临界 )=l2 / h0 and tan(θ 临界 )=s0 / b, we can determine s0=(l-h0×tan(θ 发射 ))×b / h0. In order to make the overlapped area of ​​the preset emission field of view and the defined receiving field of view both located on the side of the glass cover plate away from the surface, the closest distance h of the overlapped area of ​​the field of view relative to the reference surface can be made to be h>h0. Therefore, the distance s from the second end E2 of the shading element to the center O2 of the light receiving element in the first direction needs to satisfy s<s0, that is, s<(l-h0×tan(θ 发射 ))×b / h0.

[0042] In one implementation of the present disclosure, the shortest distance h0 in the second direction relative to the reference surface in the field of view overlap area is determined by:

[0043] h0=a+b

[0044] Wherein, a is the thickness of the glass cover plate in the second direction, and the glass cover plate is arranged to fit the shading element.

[0045] When h0 = a + b, the overlapped area of ​​the field of view with the closest distance h0 to the reference surface is located exactly on the far surface of the glass cover. 发射 ))×b / h0, it can be ensured that the overlapping area of ​​the preset emission field of view and the limited receiving field of view are both located on the side of the glass cover away from the surface 121.

[0046] In this embodiment, the width w of the shading element in the first direction satisfies:

[0047] w<lse×tan(θ 发射 )

[0048] Wherein, l is the center distance between the light emitting element and the light receiving element, and s is the distance from the end of the shading element close to the light receiving element to the center of the light receiving element in the first direction.

[0049] When w satisfies the above relationship, it can be ensured that the detection light emitted by the light emitting element with a preset emission field of view will not illuminate the shading element, thereby avoiding the problem of strong detection light being transmitted to the light receiving element 112 when the shading element 130 is not tightly shielded, causing the full-scale data collection problem of the distance sensor 110.

[0050] Figure 6 FIG. 1 is a schematic diagram showing the structure of a distance sensor assembly provided by some embodiments of the present disclosure. Figure 1 and Figure 3 Similar to the distance sensor assembly shown in FIG. 1 , in this embodiment, the distance sensor assembly 30 also includes a distance sensor 110, a glass cover plate 120 and a shading element 130, and the structures and functions of the distance sensor 110, the glass cover plate 120 and the shading element 130 are similar to those of FIG. Figure 1 and Figure 3 The distance sensor assembly shown is similar and will not be described in detail here. In this embodiment, the thickness of the glass cover plate satisfies:

[0051] a<h0-b

[0052] Wherein, a is the thickness of the glass cover in the second direction, and h0 is the shortest distance between the field of view overlap area and the reference surface in the second direction.

[0053] Similar to the above-mentioned embodiment, the second direction is perpendicular to the first direction, and the first direction is the direction in which the light emitting element and the light receiving element are spaced apart. In this embodiment, the first direction and the second direction are represented by L1 and L2, respectively. The reference plane and the plane where the light emitting surface of the light emitting element and the light incident surface of the light receiving element are located are represented by A in this embodiment. Figure 6 As shown, the limited receiving field of view of the light receiving element can be determined according to the height b of the end of the light shielding element close to the receiving field of view relative to the reference surface in the second direction and the distance s from the end of the light shielding element close to the receiving field of view to the center of the light receiving element in the first direction. According to the limited receiving field of view of the light receiving element and the preset transmitting field of view of the light transmitting element, the shortest distance h0 of the field of view overlap area relative to the reference surface in the second direction can be determined. Figure 6 As shown in FIG. 1 , if the height of the surface on the glass cover plate away from the distance sensor (i.e., the upper surface of the glass cover plate) relative to the reference surface is equal to h0, then the detection light emitted by the light emitting element at a half-viewing angle is reflected by the upper surface of the glass cover plate to form a reflected light that can just enter the light receiving element. In order to ensure that the detection light emitted by the light emitting element at a half-viewing angle is reflected by the upper surface of the glass cover plate to form a reflected light that can be shielded by the shading element, as shown in FIG. Figure 6 As shown, the height of the upper surface of the glass cover plate relative to the reference surface needs to be less than h0. In this embodiment, the height of the upper surface of the glass cover plate relative to the reference surface is equal to the height b of the end of the shading element close to the receiving field of view relative to the reference surface in the second direction and the thickness of the glass cover plate a. Therefore, in this embodiment, the thickness of the glass cover plate is set so that the glass cover plate satisfies a<h0-b. Thus, it is ensured that the overlapping area of ​​the preset emission field of view and the defined receiving field of view are both located on the side of the glass cover plate away from the surface.

[0054] In one implementation of the present disclosure, the shortest distance h0 of the field of view overlap area relative to the reference surface in the second direction is determined by the following formula:

[0055] h0=l / (tan(θ 发射 )+tan(θ 接收 ))

[0056] Among them, θ 发射 is the half field of view angle of the preset emission field of view, θ 接收 is the half field angle of the defined receiving field of view, and l is the center distance between the light emitting element and the light receiving element.

[0057] In this embodiment, the preset half viewing angle θ of the emission field of view is 发射 , the half viewing angle θ of the receiving field of view is limited 接收 , l is the center distance between the light emitting element and the light receiving element, and its meaning is the same as that in the previous embodiment and will not be repeated here.

[0058] In this embodiment, the thickness of the glass cover plate can be thinned while the size and position of the shading element remain fixed so that the overlapping area between the emitting field of view of the light emitting element and the receiving field of view of the light receiving element are both located on the side of the glass cover plate away from the surface. This can avoid the problem of increased background noise of the distance sensor 110 caused by oil pollution, thereby improving the accuracy and sensitivity of the distance sensor assembly 30.

[0059] Figure 7 A structural block diagram of a head-mounted display device provided in some embodiments of the present disclosure is shown. The head-mounted display device 70 includes: a device body 710 and a distance sensor component 720. The distance sensor component 720 is arranged on a side of the device body 710 facing the user's head. The distance sensor component 720 is the distance sensor component provided in the aforementioned embodiments.

[0060] In this embodiment, the head-mounted display device 70 can be an electronic device with an image display function, including but not limited to smart glasses based on AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality), and XR (Extended Reality).

[0061] The distance sensor assembly 720 is disposed on the side of the device body 710 facing the user's head, and is used to collect a proximity measurement signal representing the proximity between the distance sensor assembly 720 and an obstacle. The head-mounted display device 70 also includes a display device, which is disposed on the device body 710 for displaying image data. The head-mounted display device 70 can control the lighting or extinguishing of the display screen of the head-mounted display device 70 according to the proximity measurement signal collected by the distance sensor assembly.

[0062] For ease of explanation, refer to Figure 8 Take smart glasses as a head-mounted display device for illustration. Figure 8 FIG. 1 is a schematic diagram showing the structure of a pair of smart glasses provided by some embodiments of the present disclosure. Figure 8As shown, the smart glasses 80 include a glasses body 810 and a distance sensor assembly 820. The glasses body 810 may include, for example, a frame 811 and temples 812, wherein the frame 811 is connected to the temples 812. When the user wears the smart glasses, the frame 811 is usually located in front of the user's face, and the temples 812 are usually located on both sides of the user's head. For example, the temples 812 may be set above the ears on both sides of the user. The glasses body 810 also includes a display screen, which may be set on the frame 811 for displaying image data. The displayed image data can be projected onto the user's eyes. The distance sensor assembly 820 may be set on a side of the glasses body 810 facing the user's face. For example, it may be set on a side of the middle of the frame 811 facing the user's face. The distance sensor assembly 820 is used to collect a proximity measurement signal representing the proximity between the distance sensor assembly and the user's head. The proximity measurement signal changes with the change in the proximity between the distance sensor assembly and the user's head. Therefore, the change in the proximity measurement signal collected by the distance sensor component can be used to determine whether the smart glasses are being worn or taken off, thereby triggering the screen to light up or turn off.

[0063] For example, when the collected proximity measurement signal indicates that the state is approaching, it indicates that the smart glasses are in a wearing state. At this time, the control unit of the smart glasses can control the display screen of the smart glasses to light up to present the corresponding display screen to the human eye. When the collected proximity measurement signal indicates that the state is far away, it indicates that the smart glasses are in a taken off state. At this time, the control unit of the smart glasses can control the display screen of the smart glasses to turn off to prevent the display screen from being lit for a long time and avoid screen burn-in.

[0064] It should be noted that after receiving the reflected light of the detection light, the light receiving element in the above embodiment of the present disclosure uses the reflected light to detect the distance. However, it is understandable that other detections besides distance can be achieved by using the received reflected light. Therefore, the structure and arrangement of the light emitting element, light receiving element, shading element and glass cover in the above embodiment are applicable to any sensor assembly based on the active detection principle, including but not limited to position sensor assembly, speed sensor assembly, temperature sensor assembly, health monitoring (e.g., heart rate, blood pressure, blood oxygen, heart rate variability, perfusion index, etc.) sensor assembly, calorie consumption sensor assembly, alarm sensor assembly, and environmental monitoring sensor assembly.

[0065] The above implementation methods are only used to illustrate the embodiments of the present disclosure, and are not limitations of the embodiments of the present disclosure. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present disclosure. The scope of patent protection of the embodiments of the present disclosure should be defined by the claims.

Claims

1. A distance sensor assembly, comprising: Distance sensor, including: A light emitting element, used for emitting detection light with a preset emission field of view; A light receiving element is spaced apart from the light emitting element and is used to receive the reflected light after the detection light is reflected; A glass cover plate, covering the distance sensor; a shading element, disposed between the distance sensor and the glass cover plate, and configured to enable the light receiving element to receive the reflected light within a limited receiving field of view; Wherein, the overlapping area of ​​the preset transmitting field of view and the limited receiving field of view is located on the side of the glass cover plate away from the surface, and the away surface is the surface of the glass cover plate away from the side of the distance sensor.

2. The distance sensor assembly according to claim 1, wherein: The defined receiving field of view is determined by: θ 接收 =arctan(s / b) Among them, θ 接收 is the half-field-of-view angle of the defined receiving field of view, s is the distance from one end of the shading element close to the receiving field of view to the center of the light receiving element in the first direction, b is the height of one end of the shading element close to the receiving field of view relative to a reference surface in the second direction, the first direction is the direction in which the light emitting element and the light receiving element are arranged at intervals, the second direction is perpendicular to the first direction, and the reference surface is the plane where the light emitting surface of the light emitting element and the light incident surface of the light receiving element are located.

3. The distance sensor assembly according to claim 2, wherein: The shading element satisfies: s<(l-h0×tan(θ 发射 ))×b / h0 Wherein, l is the center distance between the light emitting element and the light receiving element, h0 is the closest distance between the overlapping area of ​​the field of view and the reference surface, θ 发射 is the half field of view angle of the preset emission field of view.

4. The distance sensor assembly according to claim 3, wherein: The closest distance h0 of the field of view overlap area relative to the reference surface in the second direction is determined by: h0=a+b Wherein, a is the thickness of the glass cover plate in the second direction, and the glass cover plate is arranged to fit the shading element.

5. The distance sensor assembly according to claim 2, wherein: The glass cover plate satisfies: a<h0-b Wherein, a is the thickness of the glass cover plate in the second direction, the glass cover plate is arranged to fit the shading element, and h0 is the shortest distance of the field of view overlapping area relative to the reference surface in the second direction.

6. The distance sensor assembly according to claim 5, wherein the closest distance h0 of the field of view overlap area relative to the reference surface in the second direction is determined by the following formula: <h2 style=";text-align:left;direction:ltr">h0 = l / (tan(θ<h2 style=";text-align:left;direction:ltr"> 发射 <h2 style=";text-align:left;direction:ltr"> )+tan(θ<h2 style=";text-align:left;direction:ltr"> 接收 <h2 style=";text-align:left;direction:ltr"> )) in, θ 发射 is the half field of view angle of the preset emission field of view.

7. The distance sensor assembly according to claim 1, wherein: The shading element satisfies: Wherein, d is the distance from the end of the shading element close to the emission field of view to the center of the light emitting element in the first direction, e is the height of the end of the shading element close to the emission field of view relative to the reference surface in the second direction, θ 发射 is the half field of view angle of the preset emission field of view, the first direction is the direction in which the light emitting element and the light receiving element are arranged at intervals, the second direction is perpendicular to the first direction, and the reference surface is the plane where the light emitting surface of the light emitting element and the light incident surface of the light receiving element are located.

8. The distance sensor assembly according to claim 7, wherein: The width w of the shading element in the first direction satisfies: w<lse×tan(θ 发射 ) Wherein, l is the center distance between the light emitting element and the light receiving element, and s is the distance from one end of the light shielding element close to the light receiving element to the center of the light receiving element in the first direction.

9. The distance sensor assembly according to claim 1, wherein: The distance sensor further includes a colloid, the colloid surrounds the light emitting element and the light receiving element, and the light shielding element is disposed adjacent to the colloid.

10. The distance sensor assembly according to claim 9, wherein: A light-shielding groove is provided on one side of the colloid adjacent to the light-shielding element.

11. A head mounted display device, comprising: Equipment body; A distance sensor assembly, the distance sensor assembly is arranged on a side of the device body facing the user's head; Wherein, the distance sensor component is the distance sensor component as claimed in any one of claims 1 to 10.

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