Camera with built-in PIR and radar

Abstract

The present application discloses a camera with built-in PIR and radar, the camera comprising a shell with an opening, in which a lens assembly, a PIR sensor and a radar sensor are simultaneously arranged, and then the opening of the shell is covered and closed by a front cover assembly; it can be understood that at this time, the PIR sensor can receive infrared radiation emitted by an object in a monitoring scene and output a first detection signal, and at the same time, in order to eliminate the interference of environmental thermal radiation, the radar sensor can emit radio waves toward the monitoring scene and receive radio waves reflected by the object in the monitoring scene to output a second detection signal; that is, the camera can determine the existence of an object capable of emitting thermal radiation based on the first detection signal of the PIR sensor on the one hand, and then on the other hand, in combination with the second detection signal of the radar sensor, it can exclude environmental objects or non-monitored objects (such as direct sunlight, hot air in a high-temperature environment, hot air from an air-conditioning unit, etc.), thereby effectively avoiding the occurrence of false alarms.

Description

Technical Field

[0001] The present invention relates to the technical field of cameras, and in particular to a camera with built-in PIR and radar. Background Art

[0002] Cameras can generally be used in the field of security.

[0003] With the development of technology, related technologies can integrate PIR sensors (Passive infrared detectors) on cameras. In this way, the camera can use PIR to detect infrared rays emitted by organisms within the shooting field of view and work together with the lens to achieve richer application scenarios.

[0004] However, in the above solution, since the PIR is easily interfered by the ambient thermal radiation, false alarms are often generated, which brings inconvenience to the use. Summary of the invention

[0005] In response to at least one aspect of the above technical problems, an embodiment of the present application provides a camera with built-in PIR and radar. By adding a radar sensor, the radar sensor and the PIR sensor can be used in coordination to eliminate false alarms caused by environmental thermal radiation.

[0006] The present application provides a camera, including:

[0007] a housing having an opening;

[0008] A PIR sensor and a radar sensor in a built-in housing, the PIR sensor and the radar sensor are used to respond to an object in the same monitoring scene and then output a first detection signal and a second detection signal respectively, wherein when the first detection signal indicates the existence of the object and the second detection signal indicates the position of the object, the camera determines that the object is a living body and further obtains the activity trajectory of the living body in the monitoring scene;

[0009] a lens assembly, the lens assembly comprising an optical axis, and the lens assembly is used to acquire a sequence of images containing the object;

[0010] A front cover assembly, the front cover assembly covers the opening, the front cover assembly comprises a first portion for arranging a lens window and a second portion for arranging a sensor accessory, wherein the first portion is detachably arranged above the second portion;

[0011] The sensor accessory is integrally formed, and the shape of the sensor accessory is defined as:

[0012] On the first plane, the projected cross section of the sensor assembly includes an arc segment with a radius R and horizontal line segments respectively connected to both ends of the arc, wherein the area defined by the arc segment is used to transmit the infrared radiation received by the PIR sensor, and at the same time, the area defined by the horizontal line segment is used to transmit the radio waves emitted by the radar sensor;

[0013] On the second plane, a projected cross section of the sensor assembly is a rectangle with rounded corners.

[0014] In one embodiment, preferably, on the second plane, the length corresponding to the arc segment is greater than 25 mm, and the length of the horizontal segment is greater than 15 mm;

[0015] The height of the projected cross section of the sensor accessory is greater than 20 mm.

[0016] In one embodiment, preferably, the curved surface corresponding to the arc segment is convex along the direction in which the optical axis extends.

[0017] In one embodiment, preferably, on the first plane, the radius R of the arc segment is between 55 mm and 95 mm.

[0018] In one embodiment, preferably, on the first plane, a highest point of the arc segment has a height difference with the horizontal segment, and the height difference is between 3 mm and 10 mm.

[0019] In one embodiment, preferably, in the outer surface of the sensor accessory:

[0020] The portion of the outer surface defined by the arc segment is the detection surface of the PIR sensor, and the first normal line of the vertex of the detection surface of the PIR sensor is parallel to the optical axis;

[0021] The portion of the outer surface defined by the horizontal line segment is a detection surface of the radar sensor, a second normal line of the detection surface of the radar sensor is tilted upward, and the second normal line forms a first angle with the optical axis, and the first angle is an acute angle.

[0022] In one embodiment, preferably, the outer surface of the first portion is perpendicular to the optical axis;

[0023] The outer surface of the second portion is inclined, wherein a second angle is formed between the outer surface of the second portion and the outer surface of the first portion, and the second angle is complementary to the first angle.

[0024] In one embodiment, preferably, the material of the sensor accessory is polyethylene and polyphenylene ether, wherein the material defined by the arc segment is polyethylene, and the material defined by the squirrel horizontal segment is polyphenylene ether.

[0025] In one embodiment, preferably, on the first plane, the arc segment and the horizontal segment are smoothly connected via a rounded transition.

[0026] In one embodiment, preferably, a connecting line connecting the first portion and the second portion extends horizontally.

[0027] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0028] The embodiment of the present application provides a camera with built-in PIR and radar, the camera includes a shell with an opening, a lens assembly, a PIR sensor and a radar sensor are arranged in the shell at the same time, and then the opening of the shell is covered and closed by a front cover assembly; it can be understood that at this time, the PIR sensor can receive infrared radiation emitted by an object in the monitoring scene and output a first detection signal, and at the same time, in order to eliminate the interference of environmental thermal radiation, the radar sensor can emit radio waves toward the monitoring scene and receive radio waves reflected by the object in the monitoring scene to output a second detection signal; that is, the camera can determine the existence of an object that can emit thermal radiation according to the first detection signal of the PIR sensor, and then on the other hand, in combination with the second detection signal of the radar sensor, the environmental object or non-monitored object (such as direct sunlight, hot air in a high-temperature environment, hot air from an air conditioner outside, shaking of high-temperature trees, etc.) can be excluded, thereby effectively avoiding the occurrence of false alarms. The one-piece sensor accessory combines the built-in PIR sensor and the radar sensor so that the camera can simultaneously obtain the first detection signal and the second detection signal, and thus make the structure of the camera more compact, which is conducive to component assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0030] Figure 1 Schematic diagram of the structure of the camera described in the embodiment of the present application.

[0031] Figure 2 It is a front view structural schematic diagram of the front cover assembly described in the embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of the side view structure of the camera described in the embodiment of the present application.

[0033] Figure 4It is a schematic diagram of the contoured nesting structure of the sensor accessory and the radar transparent cover in the embodiment of the present application.

[0034] Figure 5 It is a schematic diagram of the projection structure of the sensor accessory described in the embodiment of the present application on the first plane.

[0035] Figure 6 It is a schematic diagram of the projection structure of the sensor accessory in the embodiment of the present application on the second plane.

[0036] Figure 7 for Figure 6 Schematic diagram of the size and structure of the sensor accessories.

[0037] Figure 8 It is a schematic diagram of the side structure of the front cover assembly described in the embodiment of the present application.

[0038] Fig. 9 for Figure 8 A partial enlarged view of .

[0039] Wherein, the reference numerals are:

[0040] 10- housing,

[0041] 21-PIR sensor detection channel,

[0042] 31- radar cover, 32- radar sensor detection channel,

[0043] 40- lens window, 41- optical axis,

[0044] 50-front cover assembly, 51-first part, 52-second part, 53-connecting wire,

[0045] 60-sensor accessories, 61-arc segment, 62-horizontal segment, 63-rounded rectangle, 64-first normal line, 65-second normal line,

[0046] 91-Fill light window, 92-Photosensitive channel, 93-MIC channel,

[0047] M1-first angle, M2-second angle. DETAILED DESCRIPTION

[0048] In order to better understand the above technical solution, the example embodiments of the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited to the exemplary embodiments described herein.

[0049] With the development of technology, PIR sensors (Passive infrared detectors) can be integrated on cameras, which can greatly expand the application scenarios of cameras.

[0050] For example, it can be understood that since the PIR sensor can be used to detect infrared radiation in the monitoring scene, once someone enters the monitoring scene, the PIR sensor can generate an alarm signal based on the infrared radiation of the human body, so that the camera can start shooting or notify the background according to the PIR alarm signal; of course, adding a PIR sensor can also realize other richer application scenarios.

[0051] However, in the above scheme, due to the detection principle of the PIR sensor, the above alarm signal often gives false alarms; the reason is that if the monitoring scene contains hot air from a high temperature environment, hot air from an air conditioner outdoor unit, direct sunlight, swaying plants in a high temperature environment, etc. instead of the human body, since they will also emit infrared radiation different from the monitoring background, at this time, the PIR sensor will also generate an alarm signal, which is a false alarm.

[0052] In response to the above situation, that is, in order to solve the false alarm phenomenon caused by thermal radiation from the environment, the embodiment of the present application provides a camera with built-in PIR and radar. By adding a radar sensor, the camera can simultaneously receive infrared radiation signals and radar detection signals of objects in the same monitoring scene, thereby eliminating the above-mentioned false alarm phenomenon.

[0053] Figure 1 This is a schematic diagram of the camera structure. Figure 1 , a camera, the camera comprises a shell with an opening, a PIR sensor and a radar sensor built into the shell, a lens assembly and a front cover assembly; the PIR sensor and the radar sensor are used to respond to an object in the same monitoring scene and then output a first detection signal and a second detection signal respectively, wherein when the first detection signal indicates the existence of the object and the second detection signal indicates the position of the object, the camera determines that the object is a living body and further obtains the activity trajectory of the living body in the monitoring scene; the lens assembly comprises an optical axis, and the lens assembly is used to obtain an image sequence containing the object; the front cover assembly covers the opening, the front cover assembly comprises a first part for setting a lens window and a second part for setting a sensor accessory, wherein the first part is detachably arranged above the second part; wherein the sensor accessory is integrally formed, and the shape of the sensor accessory is defined as:

[0054] On the first plane, the projected cross section of the sensor assembly includes an arc segment with a radius R and horizontal line segments respectively connected to both ends of the arc, wherein the area defined by the arc segment is used to transmit infrared radiation received by the PIR sensor, and at the same time, the area defined by the horizontal line segment is used to transmit radio waves emitted by the radar sensor;

[0055] On the second plane, the projected cross section of the sensor assembly is a rectangle with rounded corners.

[0056] In order to eliminate false alarms of the PIR sensor to the greatest extent, in this embodiment as a whole, a lens assembly, a PIR sensor and a radar sensor are simultaneously arranged inside the camera housing, and the lens assembly, the PIR sensor and the radar sensor are oriented in the same direction, that is, they all monitor the same monitoring scene.

[0057] Thus, the PIR sensor may output a first detection signal in response to infrared radiation from an object within the monitoring scene, and the radar sensor may emit radio waves toward the monitoring scene and output a second detection signal in response to the radio waves reflected by the object.

[0058] At this point, it can be understood that if the above-mentioned object is a living body (such as a human body), the camera can simultaneously receive a first detection signal and a second detection signal, the first detection signal indicates the presence of an object and the second detection signal indicates the location of the object. At this time, the camera can determine that the object is a living body and is already in the monitoring scene.

[0059] If the above-mentioned object is an intangible environmental disturbance such as direct sunlight, ambient hot air or hot air from an air conditioner outdoor unit, the camera can receive the first detection signal but cannot receive the second detection signal, because ambient hot air, etc. will not reflect the radio waves emitted by the radar. At this time, the camera will not determine that the object is a living body and is already in the monitoring scene.

[0060] That is to say, on the one hand, with the help of the radar sensor's detection of physical objects, the camera of this embodiment can eliminate non-physical environmental disturbances such as direct sunlight, ambient hot air or hot air from the air-conditioning outdoor unit; and as for environmental disturbances such as high-temperature tree swaying, high-temperature water flow, etc. that the radar sensor cannot distinguish, the camera of this embodiment can simultaneously optimize and reduce false alarms based on the first detection signal output by the PIR sensor and the second detection signal output by the radar sensor, and combine the hardware circuit and the BSP (Binary space partitioning) algorithm's waveform filtering.

[0061] In summary, the camera of this embodiment can eliminate the false alarm phenomenon caused by environmental high temperature disturbance to the greatest extent by adding a radar sensor on the basis of the PIR sensor.

[0062] An embodiment of the present application provides a camera with built-in PIR and radar, the camera includes a shell with an opening, in which a lens assembly, a PIR sensor and a radar sensor are simultaneously arranged, and then the opening of the shell is covered and closed by a front cover assembly; it can be understood that at this time, the PIR sensor can receive infrared radiation emitted by objects in the monitoring scene and output a first detection signal, and at the same time, in order to eliminate the interference of environmental thermal radiation, the radar sensor can emit radio waves toward the monitoring scene and receive radio waves reflected by objects in the monitoring scene to output a second detection signal; that is, on the one hand, the camera can determine the existence of an object that can emit thermal radiation based on the first detection signal of the PIR sensor, and on the other hand, combined with the second detection signal of the radar sensor, it can exclude environmental objects or non-monitored objects (such as direct sunlight, hot air in a high-temperature environment, hot air from an air-conditioning unit, shaking of high-temperature trees, etc.), thereby effectively avoiding the occurrence of false alarms.

[0063] In addition, in this embodiment, in order to achieve a better monitoring effect of the PIR sensor and the radar sensor, the above-mentioned PIR sensor, radar sensor and lens assembly can be installed on the same end surface of the camera housing, that is, installed through the front cover assembly of the camera.

[0064] Specifically, please combine Figure 1 The front cover assembly includes a first portion at the top and a second portion at the bottom, the first portion and the second portion are detachably arranged, and a connecting line connecting the first portion and the second portion extends, for example, in a horizontal direction; wherein the first portion is used to install a lens window of the lens assembly, and a fill light window, a photosensitive channel and a microphone can also be installed on both sides of the lens window; the fill light window can fill light for the monitoring scene, the photosensitive channel can be used to detect the brightness of the monitoring scene, and the microphone can detect the sound signal of the monitoring scene.

[0065] The second part is used to install the above-mentioned PIR sensor and radar sensor.

[0066] Furthermore, the PIR sensor is located in the middle of the second part, and the two sides of the PIR sensor are radar sensors, that is, combined with Figure 6 and Figure 7 , the middle part is the PIR sensor detection channel, and the two sides are the radar sensor detection channels; at this time, it can be understood that, considering the detection angle of the radar sensor, by respectively arranging a radar sensor on the left and right sides of the PIR sensor, the detection angle of the radar sensor can be increased.

[0067] In addition, the PIR sensor and the radar sensors on both sides can be covered as a whole by an integrated sensor accessory. Compared with the method of covering each sensor separately, this can reduce the installation gap, thereby eliminating the problem of water entering the camera due to the existence of the installation gap.

[0068] Combining the detection principles of the PIR sensor and the radar sensor, the shape of the sensor accessory is limited to:

[0069] See also Figure 4 and Figure 5 , on a first plane (the first plane is, for example, a horizontal plane), the projected cross section of the sensor accessory includes an arc segment with a radius R in the middle position, the two ends of the arc segment are respectively connected to the horizontal segment, the arc segment and the horizontal segment are smoothly connected via a rounded transition, and the curved surface corresponding to the arc segment is convex along the direction in which the optical axis extends; wherein the area defined by the arc segment is used to transmit the infrared radiation received by the PIR sensor, and the area defined by the horizontal segment is used to transmit the radio waves emitted by the radar sensor; in combination Figure 6 and Figure 7 The projected cross section of the sensor accessory on the second plane (the second plane is, for example, a vertical plane) is a rectangle with rounded corners.

[0070] That is to say, the shape of the sensor accessory can be understood as a partial arc surface of a vertically placed cylinder (radius R) in the middle part, which is used to correspond to the PIR sensor, and the two side parts are vertically placed planes, which are used to correspond to the radar sensor.

[0071] The sensor accessory can be directly understood as a PIR sensor cover, which then extends toward both sides and covers the radar sensors on both sides respectively, and the portions extending toward both sides (i.e., the horizontal line segments) can be nested with the radar cover in a contour; the reason for such arrangement is that:

[0072] Considering that the material of the PIR sensor cover is usually polyethylene, high-density polyethylene (KDPE), etc., which is thin (between 0.6 mm and 0.8 mm) and has low strength; and the material of the radar cover is polyphenylene ether (PPO), which is thick (between 1.6 mm and 2.2 mm) and has high strength, by nesting the radar covers on both sides of the PIR sensor cover, that is, the radar covers are installed on the part defined by the horizontal line segment, such a high-strength radar cover can provide effective support for the easily deformable PIR sensor cover, thereby preventing the radar detection part of the PIR sensor cover from affecting the detection data of the radar sensor due to deformation (the causes of deformation include but are not limited to external impact, local depression caused by thermal expansion and contraction inside the camera, etc.).

[0073] That is, the material of the sensor accessory is polyethylene and polyphenylene ether, wherein the material defined by the arc segment is polyethylene, and the material defined by the horizontal segment is polyphenylene ether.

[0074] In one possible implementation, in the outer surface of the sensor accessory: a portion of the outer surface defined by an arc segment is a detection surface of a PIR sensor, and a first normal of a vertex of the detection surface of the PIR sensor is parallel to the optical axis; a portion of the outer surface defined by a horizontal line segment is a detection surface of a radar sensor, and a second normal of the detection surface of the radar sensor is inclined upward, and the second normal forms a first angle with the optical axis, and the first angle is an acute angle.

[0075] See also Figure 8 and Fig. 9 It can be understood that when the picture taken by the lens assembly achieves an ideal image effect, its optical axis should be located below the monitored object, and the PIR sensor is close to its requirements; then, the first normal line of the vertex of the part of the outer surface defined by the arc segment should be parallel to the optical axis, that is, the first normal line of the vertex of the detection surface of the PIR sensor is parallel to the optical axis.

[0076] For the radar sensor, the ideal monitoring setting should be that its monitoring central axis is located above the monitored object. At this time, considering the distance between the radar sensor and the monitored object, the second normal of the detection surface of the radar sensor needs to be tilted upward, and the second normal of the detection surface of the radar sensor forms a first angle with the optical axis of the lens assembly, and the first angle is an acute angle.

[0077] In a preferred embodiment, considering the distance of the monitored object relative to the camera, the acute angle (ie, the first angle) may be an angle between 3 degrees and 10 degrees.

[0078] That is, in this embodiment, the detection surface of the radar sensor is tilted upward at a small acute angle, so that it can be ensured that the radar sensor has a detection range that is approximately consistent with that of the lens assembly and the PIR sensor.

[0079] In a possible implementation, the outer surface of the first part is perpendicular to the optical axis; the outer surface of the second part is inclined, wherein a second angle is formed between the outer surface of the second part and the outer surface of the first part, and the second angle is complementary to the first angle.

[0080] That is to say, on the one hand, for the upper half area of ​​the front cover assembly (i.e., the first part) for installing the lens assembly, the upper half area of ​​the front cover assembly should be arranged perpendicular to the optical axis, i.e., the outer surface of the first part is perpendicular to the optical axis.

[0081] On the other hand, for the lower half area (i.e., the second part) of the front cover assembly for installing the radar sensor and the PIR sensor, the lower half area of ​​the front cover assembly can also be tilted upward, and the upward tilt angle should be consistent with the acute angle mentioned above;

[0082] That is to say, the lower half area of ​​the front cover assembly can be tilted upward at an angle between 3 degrees and 10 degrees together with the detection surface of the radar sensor mentioned above; in this way, the second angle formed between the outer surfaces of the lower half area of ​​the front cover assembly and the upper half area of ​​the front cover assembly is complementary to the above-mentioned acute angle (i.e., the first angle).

[0083] In this way, by tilting the lower half of the front cover assembly and the detection surface of the radar sensor upward, the front cover assembly can provide favorable support for the two side areas of the above-mentioned sensor accessories to prevent them from sinking due to external impacts; at the same time, this can also prevent the problem of protruding edges and corners of the radar sensor that are easy to scratch hands.

[0084] In a specific implementation manner, see Figure 7 On the second plane, the length L1 corresponding to the arc segment is greater than 25 mm, and the length L2 of the horizontal segment is greater than 15 mm; the height D of the projected cross section of the sensor accessory is greater than 20 mm.

[0085] That is, for the sensor accessories, its length D along the camera height direction (i.e., along the vertical direction) is greater than 20 mm, the length L1 of the area corresponding to its arc segment along the camera width direction should be greater than 25 mm, and the length L2 of its horizontal segment along the camera width direction should be greater than 15 mm; it can be understood that in this way, a better detection port can be obtained under the premise of matching the camera size.

[0086] In one specific embodiment, see Figure 4 , Figure 5 , on the first plane, the radius R of the arc segment is between 55 mm and 95 mm; that is, considering that the normal monitoring distance of the camera is 8 to 12 m, the radius R of the arc segment is set to be between 55 mm and 95 mm in this embodiment, so that the PIR sensor can better obtain the infrared radiation of the object 8 to 12 m away.

[0087] In one specific embodiment, see Figure 5 , on the first plane, the highest point of the arc segment has a height difference with the horizontal segment, and the height difference is between 3mm and 10mm.

[0088] That is, under the premise that the radius R of the above arc segment is between 55mm and 95mm, if the height difference H is large, the lateral span of the arc segment (that is, the length L1 corresponding to the above arc segment) is large. At this time, for the sensor accessory, its overall rigidity will deteriorate and it will be easy to deform (the reasons for deformation include but are not limited to external impact, local depression caused by thermal expansion and contraction inside the camera, etc.); in addition, when the height difference H is large, it will also increase the possibility of deformation due to external impact, thereby reducing the detection data of the PIR sensor.

[0089] Based on the above reasons, in this embodiment, the height difference H is limited to be between 3 mm and 10 mm.

[0090] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0091] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0092] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0093] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0094] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize that some variations, modifications, changes, additions and sub-combinations thereof should be included within the scope of protection of the present invention.

Claims

1. A camera, comprising: a housing having an opening; A PIR sensor and a radar sensor in a built-in housing, the PIR sensor and the radar sensor are used to respond to an object in the same monitoring scene and then output a first detection signal and a second detection signal respectively, wherein when the first detection signal indicates the existence of the object and the second detection signal indicates the position of the object, the camera determines that the object is a living body and further obtains the activity trajectory of the living body in the monitoring scene; a lens assembly, the lens assembly comprising an optical axis, and the lens assembly is used to acquire a sequence of images containing the object; A front cover assembly, the front cover assembly covers the opening, the front cover assembly comprises a first portion for arranging a lens window and a second portion for arranging a sensor accessory, wherein the first portion is detachably arranged above the second portion; The sensor accessory is integrally formed, and the shape of the sensor accessory is defined as: On the first plane, the projected cross section of the sensor assembly includes an arc segment with a radius R and horizontal line segments respectively connected to both ends of the arc, wherein the area defined by the arc segment is used to transmit the infrared radiation received by the PIR sensor, and at the same time, the area defined by the horizontal line segment is used to transmit the radio waves emitted by the radar sensor; On the second plane, a projected cross section of the sensor assembly is a rectangle with rounded corners.

2. The camera according to claim 1, wherein: On the second plane, the length corresponding to the arc segment is greater than 25 mm, and the length of the horizontal segment is greater than 15 mm; The height of the projected cross section of the sensor accessory is greater than 20 mm.

3. The camera according to claim 2, wherein: The curved surface corresponding to the arc segment is convex along the direction in which the optical axis extends.

4. The camera according to claim 3, wherein: On the first plane, the radius R of the arc segment is between 55 mm and 95 mm.

5. The camera according to claim 4, wherein: On the first plane, a highest point of the arc segment has a height difference with the horizontal segment, and the height difference is between 3 mm and 10 mm.

6. The camera according to claim 1, wherein: In an outer surface of the sensor assembly: The portion of the outer surface defined by the arc segment is the detection surface of the PIR sensor, and the first normal line of the vertex of the detection surface of the PIR sensor is parallel to the optical axis; The portion of the outer surface defined by the horizontal line segment is a detection surface of the radar sensor, a second normal line of the detection surface of the radar sensor is tilted upward, and the second normal line forms a first angle with the optical axis, and the first angle is an acute angle.

7. The camera according to claim 6, wherein: The outer surface of the first portion is perpendicular to the optical axis; The outer surface of the second portion is arranged to be inclined, wherein a second angle is formed between the outer surface of the second portion and the outer surface of the first portion, and the second angle is complementary to the first angle.

8. The camera according to claim 1, wherein: The material of the sensor accessory is polyethylene and polyphenylene ether, wherein the material defined by the arc segment is polyethylene, and the material defined by the horizontal segment is polyphenylene ether.

9. The camera according to claim 1, wherein: On the first plane, the arc segment and the horizontal segment are smoothly connected via a rounded transition.

10. The camera according to claim 1, wherein: A connecting line connecting the first portion and the second portion extends horizontally.

Images