Lens module and doorbell
By designing a multi-view lens module, the problems of small detection range and blind spots in existing smart doorbells have been solved, enabling effective detection at larger angles and farther distances.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TP-LINK
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-29
AI Technical Summary
Existing smart doorbells have a small detection range, blind spots, and limited detection distance.
Design a lens module, the lens body includes an upper viewing area, a middle viewing area and a lower viewing area arranged sequentially along a first direction, the upper viewing area and the middle viewing area include multiple symmetrically arranged viewing areas, the viewing areas are Fresnel pattern lenses, and are focused on the sensing position of the PIR module.
The detection angle and detection distance of the doorbell have been increased, eliminating blind spots within the detection range and improving detection efficiency.
Smart Images
Figure CN224303872U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical lens module technology, and more particularly to a lens module and a doorbell. Background Technology
[0002] With the rapid development of technology, various types of smart doorbells have emerged. A typical smart doorbell includes a PIR (Pyroelectric Infrared Sensor) module and a lens module. The lens module's main function is to focus the radiated energy from the human body onto the PIR module, which then converts it into an electrical signal. As the person moves, the focusing point of the lens module on the PIR module shifts, generating an electrical signal waveform, which is then used to detect the movement of the person.
[0003] In related technologies, the doorbell camera starts recording after detecting a moving person. Generally, the detection range of the PIR module needs to match the field of view of the camera lens; that is, the PIR module should be triggered just as a person enters the field of view, thus enabling the camera to record. However, existing doorbells have a small horizontal detection range and have blind spots. Utility Model Content
[0004] This application provides a lens module and a doorbell that can improve the problem of small horizontal detection range and blind spots in existing doorbells.
[0005] In a first aspect, embodiments of this application provide a lens module for a doorbell, the doorbell including a PIR module, the lens module including a mirror body, the mirror body being arc-shaped, the mirror body having a vertical central axis, and the mirror body including an upper viewing area, a middle viewing area and a lower viewing area arranged sequentially along a first direction;
[0006] The upper viewing area includes three first viewing areas, which are arranged sequentially along a second direction. The second direction is perpendicular to the first direction, and in the second direction, the first and third first viewing areas are symmetrically arranged about the vertical central axis.
[0007] The middle layer view area includes six second view areas, which are arranged sequentially along the second direction. In the second direction, the first three second view areas and the last three second view areas are arranged symmetrically about the vertical central axis.
[0008] The lower viewing area includes three third viewing areas, which are arranged sequentially along the second direction. In the second direction, the first and third third viewing areas are symmetrically arranged about the vertical central axis. The first, second, and third viewing areas are all lenses with Fresnel patterns and are all focused on the sensing position of the PIR module.
[0009] In some embodiments, in the second direction, the three first viewing areas are sequentially designated as a first area, a second area, and a third area. The centers of the concentric circles of the Fresnel patterns in the first area, the second area, and the third area are located at the same position in the first direction. The centers of the concentric circles of the Fresnel patterns in the first area are located on the side of the horizontal center line of the Fresnel pattern area of the first area facing the middle layer viewing area. The centers of the concentric circles of the Fresnel patterns in the second area are located on the side of the horizontal center line of the Fresnel pattern area of the second area facing the middle layer viewing area. The centers of the concentric circles of the Fresnel patterns in the third area are located on the side of the horizontal center line of the Fresnel pattern area of the third area facing the middle layer viewing area. The horizontal center lines of the Fresnel patterns in the first, second, and third areas are collinear. The first, second, and third areas each have an optical angle of 18° in the horizontal direction.
[0010] In some embodiments, the center of the concentric circles of the Fresnel pattern in the first region is located on the side of the vertical center line of the Fresnel pattern area in the first region facing the second region, the center of the concentric circles of the Fresnel pattern in the second region is located on the vertical center line of the Fresnel pattern area in the second region, and the center of the concentric circles of the Fresnel pattern in the third region is located on the side of the vertical center line of the Fresnel pattern area in the third region facing the second region.
[0011] In some embodiments, in the second direction, the six second viewing areas are sequentially designated as the fourth, fifth, sixth, seventh, eighth, and ninth areas. The centers of the concentric circles of the Fresnel patterns in the fourth, fifth, sixth, seventh, eighth, and ninth areas are located at the same position in the first direction. The center of the concentric circles of the Fresnel patterns in the fourth, fifth, sixth, seventh, eighth, and ninth areas is located on the horizontal center line of the Fresnel pattern region in the fourth area, the center of the concentric circles of the Fresnel patterns in the fifth area is located on the horizontal center line of the Fresnel pattern region in the fifth area, and the center of the concentric circles of the Fresnel patterns in the sixth area is located on the horizontal center line of the Fresnel pattern region in the sixth area. On the horizontal center line, the center of the concentric circles of the Fresnel pattern in the seventh region is located on the horizontal center line of the Fresnel pattern area in the seventh region; the center of the concentric circles of the Fresnel pattern in the eighth region is located on the horizontal center line of the Fresnel pattern area in the eighth region; the center of the concentric circles of the Fresnel pattern in the ninth region is located on the horizontal center line of the Fresnel pattern area in the ninth region; the horizontal center lines of the Fresnel pattern areas in the fourth, fifth, sixth, sixth, seventh, eighth, and ninth regions are collinear; and the fourth, fifth, sixth, seventh, eighth, and ninth regions each have an optical angle of 25° in the horizontal direction.
[0012] In some embodiments, the center of the concentric circles of the Fresnel pattern in the fourth region is located on the side opposite to the fifth region from the vertical center line of the Fresnel pattern area in the fourth region; the center of the concentric circles of the Fresnel pattern in the fifth region is located on the side opposite to the sixth region from the vertical center line of the Fresnel pattern area in the fifth region; the center of the concentric circles of the Fresnel pattern in the sixth region is located on the side opposite to the seventh region from the vertical center line of the Fresnel pattern area in the sixth region; the center of the concentric circles of the Fresnel pattern in the seventh region is located on the side opposite to the sixth region from the vertical center line of the Fresnel pattern area in the seventh region; the center of the concentric circles of the Fresnel pattern in the eighth region is located on the side opposite to the seventh region from the vertical center line of the Fresnel pattern area in the eighth region; and the center of the concentric circles of the Fresnel pattern in the ninth region is located on the side opposite to the eighth region from the vertical center line of the Fresnel pattern area in the ninth region.
[0013] In some embodiments, the sum of the areas of the fourth, fifth, sixth, seventh, eighth and ninth regions, S, is 60%-90% of the lens area, and the sum of the areas of the fourth and ninth regions is 40%-50% of S.
[0014] In some embodiments, in the second direction, the three third viewing regions are sequentially designated as region ten, region eleven, and region twelf. The centers of the concentric circles of the Fresnel patterns in region ten, region eleven, and region twelf are located at the same position in the first direction. The center of the concentric circles of the Fresnel patterns in region ten is located on the side of the horizontal center line of the Fresnel pattern region of region ten facing the middle layer viewing region. The center of the concentric circles of the Fresnel patterns in region eleven... The center of the circle is located on the side of the horizontal center line of the eleventh Fresnel pattern region facing the middle layer of the viewing area. The center of the concentric circle of the Fresnel pattern in the twelfth region is located on the side of the horizontal center line of the twelfth Fresnel pattern region facing the middle layer of the viewing area. The horizontal center lines of the tenth Fresnel pattern region, the eleventh Fresnel pattern region, and the twelfth Fresnel pattern region are collinear. The tenth, eleventh, and twelfth regions each have an optical angle of 17° in the horizontal direction.
[0015] In some embodiments, the center of the concentric circles of the Fresnel pattern in the tenth region is located on the side of the vertical center line of the Fresnel pattern area in the tenth region facing the eleventh region; the center of the concentric circles of the Fresnel pattern in the eleventh region is located on the vertical center line of the Fresnel pattern area in the eleventh region; and the center of the concentric circles of the Fresnel pattern in the twelfth region is located on the side of the vertical center line of the Fresnel pattern area in the twelfth region facing the eleventh region.
[0016] In some embodiments, the tooth pitch range of the Fresnel pattern in the first view area, the Fresnel pattern in the second view area, and the Fresnel pattern in the third view area is 0.2mm-0.3mm, and the tooth height is less than 0.25mm.
[0017] In some embodiments, the diameter φ of the mirror body ranges from 18mm to 25mm, and the refraction angle of the mirror body is <75°.
[0018] In some embodiments, the focal length f of the lens is 8.8 mm.
[0019] In some embodiments, the thickness of the mirror body is 0.65 mm.
[0020] Secondly, embodiments of this application provide a doorbell, which includes a PIR module and a lens module as described in the first aspect.
[0021] The lens module provided in this application has the following advantages: Since the lens body includes an upper viewing area, a middle viewing area, and a lower viewing area arranged sequentially along a first direction, and the upper viewing area includes three first viewing areas arranged sequentially along a second direction perpendicular to the first direction, with the first and third first viewing areas symmetrically arranged about a vertical central axis in the second direction; the middle viewing area includes six second viewing areas arranged sequentially along the second direction, with the first three and last three second viewing areas symmetrically arranged about a vertical central axis in the second direction; and the lower viewing area includes three third viewing areas arranged sequentially along the second direction, with the first and third third viewing areas symmetrically arranged about a vertical central axis in the second direction. All three viewing areas (first, second, and third) are lenses with Fresnel patterns and are focused on the sensing position of the PIR module. Therefore, the detection angle of the doorbell is increased, the detection distance is longer, and there are no blind spots within the detection range, thus improving the problem of small horizontal detection range and blind spots in existing doorbells.
[0022] The advantages of the doorbell provided in this application compared to the prior art can be seen in the description of the advantages of the lens module provided in this application compared to the prior art, which will not be repeated here. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a three-dimensional structural diagram of the lens module in one embodiment of this application;
[0025] Figure 2 yes Figure 1 The front view of the lens module shown;
[0026] Figure 3 This is a schematic diagram of the tooth pitch and tooth height of the Fresnel pattern of a lens sheet provided with Fresnel pattern in one embodiment of this application.
[0027] The markings in the diagram mean:
[0028] 100. Lens body;
[0029] 10. Upper viewing area; 11. Zone 1; 12. Zone 2; 13. Zone 3; 20. Middle viewing area; 21. Zone 4; 22. Zone 5; 23. Zone 6; 24. Zone 7; 25. Zone 8; 26. Zone 9; 30. Lower viewing area; 31. Zone 10; 32. Zone 11; 33. Zone 12. Detailed Implementation
[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0033] In this specification, references to "one embodiment," "some embodiments," or simply "embodiment" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. Furthermore, in one or more embodiments, specific features, structures, or characteristics may be combined in any suitable manner.
[0034] To illustrate the technical solution of this application, the following description is provided in conjunction with specific accompanying drawings and embodiments.
[0035] With the rapid development of technology, various types of smart doorbells have emerged. A typical smart doorbell includes a PIR (Pyroelectric Infrared Sensor) module and a lens module. The lens module's main function is to focus the radiated energy from the human body onto the PIR module, which then converts it into an electrical signal. As the person moves, the focusing point of the lens module on the PIR module shifts, generating an electrical signal waveform, which is then used to detect the movement of the person.
[0036] In related technologies, the doorbell's camera starts recording after detecting a moving person. Generally, the detection range of the PIR module needs to match the camera's field of view; that is, the PIR module should trigger precisely when a person enters the camera's field of view, thus enabling the camera to record. However, existing doorbells have the following problems:
[0037] 1. Small horizontal detection range: Nowadays, more and more fisheye lenses are used on doorbells. The horizontal field of view of these lenses can usually reach more than 140°. The lens module corresponding to the common PIR module usually has a detection angle of less than 120°. This will cause a mismatch between the detection range and the field of view of the lens, that is, it will take a while for recording to be triggered after a person enters the camera's monitoring range.
[0038] 2. Blind spots exist: When the left and right field of view is large, if the number of partitions in the lens module is too small or the partitioning is unreasonable, blind spots will exist within the detection range.
[0039] 3. Short detection range: The maximum detection range is usually only 5m-6m, which limits the detection of people at a distance.
[0040] In view of this, this application provides a lens module and a doorbell. The lens body includes an upper viewing area, a middle viewing area, and a lower viewing area arranged sequentially along a first direction. The upper viewing area includes three first viewing areas arranged sequentially along a second direction, which is perpendicular to the first direction. Furthermore, the first and third first viewing areas are symmetrically arranged about a vertical central axis along the second direction. The middle viewing area includes six second viewing areas arranged sequentially along the second direction, with the first three and last three second viewing areas symmetrically arranged about a vertical central axis along the second direction. The lower viewing area includes three third viewing areas arranged sequentially along the second direction, with the first and third third viewing areas symmetrically arranged about a vertical central axis along the second direction. All three viewing areas (first, second, and third) are lenses with Fresnel patterns and are focused on the sensing position of the PIR module. Therefore, the detection angle of the doorbell is increased, the detection distance is longer, and there are no blind spots within the detection range. This improves upon the existing doorbell's problem of a small horizontal detection range and blind spots.
[0041] Please refer to Figure 1 and Figure 2 , Figure 1 This is a three-dimensional structural diagram of the lens module in one embodiment of this application. Figure 2 yes Figure 1 The front view of the lens module shown.
[0042] In a first aspect, embodiments of this application provide a lens module for a doorbell. The doorbell includes a PIR module, and the lens module includes a lens body 100. The lens body 100 is arc-shaped and has a vertical central axis L. The lens body 100 includes an upper viewing area 10, a middle viewing area 20, and a lower viewing area 30 sequentially arranged along a first direction. The first direction can be... Figure 2 The direction indicated by the middle arrow M.
[0043] The upper viewing area 10 includes three first viewing areas, which are arranged sequentially along a second direction. The second direction is perpendicular to the first direction, and the second direction can be... Figure 2 The direction indicated by the middle arrow N, and in the second direction, the first and third first view zones are symmetrically set about the vertical central axis L.
[0044] The middle-level viewing area 20 includes six second viewing areas, which are arranged sequentially along a second direction. In the second direction, the first three second viewing areas and the last three second viewing areas are symmetrically arranged about the vertical central axis L.
[0045] The lower viewing area 30 includes three third viewing areas, which are arranged sequentially along the second direction. In the second direction, the first and third third viewing areas are symmetrically arranged about the vertical central axis L. The first, second, and third viewing areas are all lenses with Fresnel patterns and are all focused on the sensing position of the PIR module.
[0046] As can be seen from the above, the lens module provided in this application embodiment includes an upper viewing area 10, a middle viewing area 20, and a lower viewing area 30 arranged sequentially along a first direction. The upper viewing area 10 includes three first viewing areas arranged sequentially along a second direction, which is perpendicular to the first direction. Furthermore, in the second direction, the first three second viewing areas and the last three second viewing areas are symmetrically arranged about the vertical central axis L. The middle viewing area 20 includes six second viewing areas arranged sequentially along a second direction. Also, in the second direction, the first three second viewing areas and the last three second viewing areas are symmetrically arranged about the vertical central axis L. The two viewing zones are symmetrically arranged about the vertical central axis L; the lower viewing zone 30 includes three third viewing zones, which are arranged sequentially along the second direction. In the second direction, the first and third third viewing zones are symmetrically arranged about the vertical central axis L. The first, second, and third viewing zones are all lenses with Fresnel patterns and are all focused on the sensing position of the PIR module. Therefore, the detection angle of the doorbell can be increased, the detection distance can be increased, and there are no blind spots in the detection range. This can improve the problem of the existing doorbell having a small horizontal detection range and blind spots.
[0047] Please refer to Figure 1 and Figure 2 In this embodiment, in the second direction, the three first viewing areas are, in sequence, the first area 11, the second area 12, and the third area 13. The centers of the concentric circles of the Fresnel patterns in the first area 11, the second area 12, and the third area 13 are located at the same position in the first direction. The center of the concentric circles of the Fresnel patterns in the first area 11 is located on the side of the horizontal center line K1 of the Fresnel pattern area of the first area 11 facing the middle layer viewing area 20. The center of the concentric circles of the Fresnel patterns in the second area 12 is located on the side of the horizontal center line K1 of the Fresnel pattern area of the first area 11 facing the middle layer viewing area 20. The horizontal center line K1 of the Fresnel pattern area in the second zone 12 faces the middle layer viewing area 20. The center of the concentric circles of the Fresnel pattern in the third zone 13 is located on the side of the horizontal center line K1 of the Fresnel pattern area in the third zone 13 facing the middle layer viewing area 20. The horizontal center lines K1 of the Fresnel pattern area in the first zone 11, the second zone 12, and the third zone 13 are collinear. The first zone 11, the second zone 12, and the third zone 13 each have an optical angle of 18° in the horizontal direction.
[0048] By adopting the above scheme, the detection angle corresponding to the upper viewing area 10 can be larger, and there are no blind spots within the detection range.
[0049] Among them, the center of the concentric circles of the Fresnel pattern in the first zone 11 is located on the side of the vertical center line L1 of the Fresnel pattern area in the first zone 11 facing the second zone 12; the center of the concentric circles of the Fresnel pattern in the second zone 12 is located on the vertical center line L of the Fresnel pattern area in the second zone 12; and the center of the concentric circles of the Fresnel pattern in the third zone 13 is located on the side of the vertical center line of the Fresnel pattern area in the third zone 13 facing the second zone 12.
[0050] This configuration allows for a larger detection angle corresponding to the upper viewing area 10, with no blind spots within the detection range.
[0051] Please refer to Figure 1 and Figure 2 In this embodiment, in the second direction, the six second viewing areas are sequentially designated as area 21 (fourth area), 22 (fifth area), 23 (sixth area), 24 (seventh area), 25 (eighth area), and 26 (ninth area). The centers of the concentric circles of the Fresnel patterns in area 21, 22, 23, 24, and 25 are respectively... The centers of the concentric circles of the Fresnel patterns in Zone 9, 26, are located in the same position in the first direction. The centers of the concentric circles of the Fresnel patterns in Zone 4, 21, are located on the horizontal center line K2 of the Fresnel pattern area in Zone 4, 21. The centers of the concentric circles of the Fresnel patterns in Zone 5, 22, and 23 are located on the horizontal center line K2 of the Fresnel pattern area in Zone 6, 23. On K2, the center of the concentric circles of the Fresnel pattern in zone 7, area 24, is located on the horizontal center line K2 of the Fresnel pattern area in zone 7, area 24; the center of the concentric circles of the Fresnel pattern in zone 8, area 25, area 8, area 25, area 25, area 26, area 9, area 26, area 9, area 26, and area 27, area 24, area 8, area 25, and area 9, area 26, are collinear. Zones 4, 5, 6, 7, 8, and 9, each have an optical angle of 25° in the horizontal direction.
[0052] By adopting the above scheme, the middle-level viewing area 20 can be made to have no blind spots within the detection range of the full detection angle of 150°.
[0053] Among them, the center of the concentric circles of the Fresnel pattern in zone 21 is located on the side away from zone 22, opposite to the vertical center line L2 of the Fresnel pattern area in zone 21; the center of the concentric circles of the Fresnel pattern in zone 22 is located on the side away from zone 23, opposite to the vertical center line of the Fresnel pattern area in zone 22; the center of the concentric circles of the Fresnel pattern in zone 23 is located on the side away from zone 24, opposite to the vertical center line of the Fresnel pattern area in zone 23; the center of the concentric circles of the Fresnel pattern in zone 24 is located on the side away from zone 23, opposite to the vertical center line L4 of the Fresnel pattern area in zone 24; the center of the concentric circles of the Fresnel pattern in zone 25 is located on the side away from zone 24, opposite to the vertical center line L5 of the Fresnel pattern area in zone 25; and the center of the concentric circles of the Fresnel pattern in zone 26 is located on the side away from zone 25, opposite to the vertical center line of the Fresnel pattern area in zone 26.
[0054] This configuration ensures that the middle-level viewing area 20 has no blind spots within the full detection angle of 150°.
[0055] Optionally, the sum of the areas S of the fourth zone 21, the fifth zone 22, the sixth zone 23, the seventh zone 24, the eighth zone 25, and the ninth zone 26 is 60%-90% of the area of the lens 100, such as 60%, 70%, 80%, or 90%, etc., and the sum of the areas of the fourth zone 21 and the ninth zone 26 is 40%-50% of S, such as 40%, 42%, 48%, or 50%, etc.
[0056] This configuration allows the middle-level field of view 20 to have a larger detection angle and no blind spots within the detection range.
[0057] It should be noted that the farthest detection distance of Zone 23 in the sixth zone and the farthest detection distance of Zone 24 in the seventh zone are both 11.5m, the farthest detection distance of Zone 22 in the fifth zone and the farthest detection distance of Zone 25 in the eighth zone are both 7.5m, and the farthest detection distance of Zone 21 in the fourth zone and the farthest detection distance of Zone 26 in the ninth zone are both 6.2m.
[0058] Please refer to Figure 1 and Figure 2In this embodiment, in the second direction, the three third viewing areas are, in order, the tenth area 31, the eleventh area 32, and the twelfth area 33. The centers of the concentric circles of the Fresnel patterns in the tenth area 31, the eleventh area 32, and the twelfth area 33 are located at the same position in the first direction. The center of the concentric circles of the Fresnel patterns in the tenth area 31 is located on the side of the horizontal center line K3 of the Fresnel pattern region of the tenth area 31 facing the middle layer viewing area 20. The center of the concentric circles of the Fresnel patterns in the eleventh area 32 is located on the side of the horizontal center line K3 of the Fresnel pattern region of the tenth area 31 facing the middle layer viewing area 20. The horizontal center line K3 of the Fresnel pattern area in zone 32 of region 11 faces the middle viewing area 20. The center of the concentric circles of the Fresnel pattern in zone 33 of region 12 is located on the side of the horizontal center line K3 of the Fresnel pattern area in zone 33 of region 12 facing the middle viewing area 20. The horizontal center lines K3 of the Fresnel pattern area in zone 31 of region 10, the Fresnel pattern area in zone 32 of region 11, and the Fresnel pattern area in zone 33 of region 12 are collinear. Zones 31, 32 and 33 of region 12 each have an optical angle of 17° in the horizontal direction.
[0059] By adopting the above scheme, the detection angle corresponding to the lower viewing area 30 can be larger, and there are no blind spots within the detection range.
[0060] Among them, the center of the concentric circles of the Fresnel pattern in zone 31 is located on the side of the vertical center line L3 of the Fresnel pattern area in zone 31 facing zone 11; the center of the concentric circles of the Fresnel pattern in zone 32 is located on the vertical center line of the Fresnel pattern area in zone 11 (coinciding with the vertical center axis L); and the center of the concentric circles of the Fresnel pattern in zone 33 is located on the side of the vertical center line of the Fresnel pattern area in zone 33 facing zone 11.
[0061] This configuration allows for a larger detection angle corresponding to the lower view area 30, with no blind spots within the detection range.
[0062] Please refer to this as well. Figure 3 , Figure 3 This is a schematic diagram of the tooth pitch and tooth height of the Fresnel pattern of a lens sheet provided with Fresnel pattern in one embodiment of this application.
[0063] Optionally, the tooth pitch a of the Fresnel pattern in the first viewing area, the Fresnel pattern in the second viewing area, and the Fresnel pattern in the third viewing area are all in the range of 0.2mm-0.3mm, such as 0.2mm, 0.25mm, or 0.3mm, and the tooth height b is less than 0.25mm.
[0064] This configuration allows the lenses corresponding to the first, second, and third viewing zones to precisely refract and converge light, enabling the light to propagate in the designed direction, reducing light scattering and loss, thereby improving the efficiency and imaging quality of the lens body 100.
[0065] Optionally, the diameter φ of the mirror body 100 is in the range of 18mm-25mm, such as 18mm, 20mm, 23mm or 25mm, and the refraction angle of the mirror body 100 is <75°.
[0066] This configuration allows the mirror 100 to have a large detection angle, no blind spots in the field of view, and a long detection distance.
[0067] For example, the focal length f of lens 100 is 8.8mm.
[0068] This configuration allows the mirror 100 to have a large detection angle, no blind spots in the field of view, and a long detection distance.
[0069] Optionally, the thickness of the lens body 100 is 0.65 mm.
[0070] This configuration allows the mirror 100 to have a large detection angle, no blind spots in the field of view, and a long detection distance.
[0071] The lens module provided in the above embodiment has a horizontal detection angle of 150° and a vertical detection angle of 60°. Its wide lateral detection angle, reaching 150°, makes it more suitable for doorbell detection with a large field of view. Furthermore, the middle viewing area 20 is divided into six second viewing areas, each with a 25° optical angle in the horizontal direction, ensuring no blind spots within the full 150° detection range. It also boasts a long detection distance, reaching a maximum of 11.5m.
[0072] Secondly, embodiments of this application provide a doorbell, which includes a PIR module and a lens module as described in the first aspect.
[0073] The doorbell provided in this embodiment has a lens module body 100 comprising an upper viewing area 10, a middle viewing area 20, and a lower viewing area 30 arranged sequentially along a first direction. The upper viewing area 10 includes three first viewing areas arranged sequentially along a second direction, which is perpendicular to the first direction. Furthermore, in the second direction, the first three second viewing areas and the last three second viewing areas are symmetrically arranged about the vertical central axis L. The middle viewing area 20 includes six second viewing areas arranged sequentially along a second direction. Also, in the second direction, the first three second viewing areas and the last three second viewing areas are symmetrically arranged about the vertical central axis L. The viewing areas are symmetrically arranged about the vertical central axis L; the lower viewing area 30 includes three third viewing areas, which are arranged sequentially along the second direction. In the second direction, the first and third third viewing areas are symmetrically arranged about the vertical central axis L. The first, second, and third viewing areas are all lenses with Fresnel patterns and are all focused on the sensing position of the PIR module. Therefore, the detection angle of the doorbell can be increased and the detection distance can be longer. There are no blind spots in the detection range, which can improve the problem of the existing doorbell having a small horizontal detection range and blind spots.
[0074] It is understood that the doorbell provided in this application embodiment may also include a housing and a circuit board, etc., which will not be described in detail here.
[0075] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A lens module, characterized in that, For use in a doorbell, the doorbell includes a PIR module, the lens module includes a lens body, the lens body is arc-shaped, the lens body has a vertical central axis, and the lens body includes an upper viewing area, a middle viewing area and a lower viewing area arranged sequentially along a first direction; The upper viewing area includes three first viewing areas, which are arranged sequentially along a second direction. The second direction is perpendicular to the first direction, and in the second direction, the first and third first viewing areas are symmetrically arranged about the vertical central axis. The middle layer view area includes six second view areas, which are arranged sequentially along the second direction. In the second direction, the first three second view areas and the last three second view areas are arranged symmetrically about the vertical central axis. The lower viewing area includes three third viewing areas, which are arranged sequentially along the second direction. In the second direction, the first and third third viewing areas are symmetrically arranged about the vertical central axis. The first, second, and third viewing areas are all lenses with Fresnel patterns and are all focused on the sensing position of the PIR module.
2. The lens module according to claim 1, characterized in that, In the second direction, the three first viewing areas are sequentially designated as a first area, a second area, and a third area. The centers of the concentric circles of the Fresnel patterns in the first area, the second area, and the third area are located at the same position in the first direction. The center of the concentric circles of the Fresnel patterns in the first area is located on the side of the horizontal center line of the Fresnel pattern area of the first area facing the middle layer viewing area. The center of the concentric circles of the Fresnel patterns in the second area is located on the side of the horizontal center line of the Fresnel pattern area of the second area facing the middle layer viewing area. The center of the concentric circles of the Fresnel patterns in the third area is located on the side of the horizontal center line of the Fresnel pattern area of the third area facing the middle layer viewing area. The horizontal center lines of the Fresnel patterns in the first, second, and third areas are collinear. The first, second, and third areas each have an optical angle of 18° in the horizontal direction.
3. The lens module according to claim 2, characterized in that, The center of the concentric circles of the Fresnel pattern in the first region is located on the side of the vertical center line of the Fresnel pattern area in the first region facing the second region. The center of the concentric circles of the Fresnel pattern in the second region is located on the vertical center line of the Fresnel pattern area in the second region. The center of the concentric circles of the Fresnel pattern in the third region is located on the side of the vertical center line of the Fresnel pattern area in the third region facing the second region.
4. The lens module according to claim 1, characterized in that, In the second direction, the six second viewing areas are sequentially designated as the fourth, fifth, sixth, seventh, eighth, and ninth areas. The centers of the concentric circles of the Fresnel patterns in the fourth, fifth, sixth, seventh, eighth, and ninth areas are located at the same position in the first direction. The center of the concentric circle of the Fresnel pattern in the fourth area is located on the horizontal center line of the Fresnel pattern area in the fourth area, the center of the concentric circle of the Fresnel pattern in the fifth area is located on the horizontal center line of the Fresnel pattern area in the fifth area, and the center of the concentric circle of the Fresnel pattern in the sixth area is located at the horizontal center line of the Fresnel pattern area in the sixth area. Online, the center of the concentric circles of the Fresnel pattern in the seventh region is located on the horizontal center line of the Fresnel pattern area in the seventh region; the center of the concentric circles of the Fresnel pattern in the eighth region is located on the horizontal center line of the Fresnel pattern area in the eighth region; the center of the concentric circles of the Fresnel pattern in the ninth region is located on the horizontal center line of the Fresnel pattern area in the ninth region; the horizontal center lines of the Fresnel pattern areas in the fourth, fifth, sixth, sixth, seventh, eighth, and ninth regions are collinear; and the fourth, fifth, sixth, seventh, eighth, and ninth regions each have an optical angle of 25° in the horizontal direction.
5. The lens module according to claim 4, characterized in that, The center of the concentric circles of the Fresnel pattern in the fourth region is located on the side opposite to the fifth region from the vertical center line of the Fresnel pattern area in the fourth region. The center of the concentric circles of the Fresnel pattern in the fifth region is located on the side opposite to the sixth region from the vertical center line of the Fresnel pattern area in the fifth region. The center of the concentric circles of the Fresnel pattern in the sixth region is located on the side opposite to the seventh region from the vertical center line of the Fresnel pattern area in the sixth region. The center of the concentric circles of the Fresnel pattern in the seventh region is located on the side opposite to the sixth region from the vertical center line of the Fresnel pattern area in the seventh region. The center of the concentric circles of the Fresnel pattern in the eighth region is located on the side opposite to the seventh region from the vertical center line of the Fresnel pattern area in the eighth region. The center of the concentric circles of the Fresnel pattern in the ninth region is located on the side opposite to the eighth region from the vertical center line of the Fresnel pattern area in the ninth region.
6. The lens module according to claim 5, characterized in that, The sum of the areas of the fourth, fifth, sixth, seventh, eighth and ninth regions, S, is 60%-90% of the area of the lens body, and the sum of the areas of the fourth and ninth regions is 40%-50% of S.
7. The lens module according to claim 1, characterized in that, In the second direction, the three third viewing areas are sequentially designated as the tenth, eleventh, and twelfth areas. The centers of the concentric circles of the Fresnel patterns in the tenth, eleventh, and twelfth areas are located at the same position in the first direction. The center of the concentric circles of the Fresnel patterns in the tenth area is located on the side of the horizontal center line of the Fresnel pattern region of the tenth area facing the middle layer viewing area. The center of the concentric circles of the Fresnel patterns in the eleventh area is located on the side of the horizontal center line of the Fresnel pattern region of the tenth area facing the middle layer viewing area. The horizontal center line of the eleventh Fresnel pattern region faces the middle layer of the viewing area. The center of the concentric circles of the Fresnel pattern in the twelfth region is located on the side of the horizontal center line of the twelfth Fresnel pattern region facing the middle layer of the viewing area. The horizontal center lines of the tenth, eleventh, and twelfth Fresnel patterns are collinear. The tenth, eleventh, and twelfth regions each have an optical angle of 17° in the horizontal direction.
8. The lens module according to claim 7, characterized in that, The center of the concentric circles of the Fresnel pattern in the tenth region is located on the side of the vertical center line of the Fresnel pattern area in the tenth region facing the eleventh region; the center of the concentric circles of the Fresnel pattern in the eleventh region is located on the vertical center line of the Fresnel pattern area in the eleventh region; and the center of the concentric circles of the Fresnel pattern in the twelfth region is located on the side of the vertical center line of the Fresnel pattern area in the twelfth region facing the eleventh region.
9. The lens module according to claim 1, characterized in that, The tooth pitch range of the Fresnel patterns in the first view area, the second view area, and the third view area is 0.2mm-0.3mm, and the tooth height is less than 0.25mm.
10. The lens module according to any one of claims 1 to 9, characterized in that, The diameter φ of the mirror body ranges from 18mm to 25mm, and the refraction angle of the mirror body is <75°.
11. The lens module according to claim 10, characterized in that, The focal length f of the lens is 8.8 mm.
12. The lens module according to claim 10, characterized in that, The thickness of the mirror body is 0.65 mm.
13. A doorbell, characterized in that, The doorbell includes a PIR module and a lens module as described in any one of claims 1 to 12.