CN114839707A - Spherical array Fresnel lens, detector and security system - Google Patents
Spherical array Fresnel lens, detector and security system Download PDFInfo
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- CN114839707A CN114839707A CN202210466155.9A CN202210466155A CN114839707A CN 114839707 A CN114839707 A CN 114839707A CN 202210466155 A CN202210466155 A CN 202210466155A CN 114839707 A CN114839707 A CN 114839707A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
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Abstract
The application relates to the technical field of detectors, and provides a spherical array Fresnel lens, a detector and a security system, wherein the spherical array Fresnel lens comprises a lens body, and the lens body is provided with an inner spherical surface and an outer spherical surface; the center of the inner spherical surface of the lens body is provided with a central lens sheet layer, and the inner spherical surface of the lens body is also provided with a plurality of groups of annular lens sheet layers; the central lens sheet layer comprises a Fresnel lens element, and the annular lens sheet layer comprises a plurality of Fresnel lens elements; the detector comprises the spherical array Fresnel lens; the security system comprises the detector. The application provides a spherical array Fresnel lens, detector and security protection system, satisfying under detection angle and detection distance's requirement, can be applicable to the hanging mounting means simultaneously and inhale a mounting means.
Description
Technical Field
The application belongs to the technical field of detectors, and particularly relates to a spherical array Fresnel lens, a detector and a security system.
Background
The Fresnel lens used by the passive infrared intrusion detector is mostly formed by pressing high-density polyethylene materials, and the Fresnel lens mainly has the function of imaging a heating target object on an infrared pyroelectric sensor wafer or focusing thermal infrared rays (the wavelength is between 3 and 14 mu m) emitted by the heating object on the pyroelectric sensor.
The Fresnel lens has the shape of a plane, a semi-spherical surface, an aspherical surface and the like. At present, the curved semicircle that becomes of planar fresnel lens on the market uses, is mostly the hanging mounting means, and hemispherical fresnel lens is mostly the mounting means that inhales on the top, satisfying under detection angle and detection distance's requirement, and conventional fresnel lens is difficult to be applicable to the hanging mounting means simultaneously and inhales the top mounting means, so remain to improve.
Disclosure of Invention
An object of the embodiment of the present application is to provide a spherical array fresnel lens, a detector and a security system, so as to improve the following technical problems: under the requirement of satisfying detection angle and detection distance, conventional fresnel lens is difficult to be applicable to hanging mounting means and ceiling mounting means simultaneously.
In a first aspect, the present application provides a spherical array fresnel lens, comprising a lens body having an inner spherical surface and an outer spherical surface;
a central lens sheet layer is fixed at the center of the inner spherical surface of the lens body, a plurality of groups of annular lens sheet layers are further arranged on the inner spherical surface of the lens body, the annular lens sheet layer positioned at the innermost circle is arranged around the central lens sheet layer, and the annular lens sheet layer positioned at the adjacent outer circle is arranged around the annular lens sheet layer positioned at the adjacent inner circle;
the central lens sheet layer comprises a Fresnel lens element, and the annular lens sheet layer comprises a plurality of Fresnel lens elements.
In an achievable technical solution of the present application, a focal length of each fresnel lens element is smaller than a radius of curvature of the inner surface of the lens body at a location where the fresnel lens element is located.
In an implementable solution of the present application, the tooth height of the fresnel lens element is between 0.15 and 0.25 mm, and the thickness of the fresnel lens element is between 0.5 and 1.0 mm.
In an achievable technical scheme of this application, the interior sphere of lens body is provided with three groups annular lens lamella, three groups the annular lens lamella is first annular lens lamella, second annular lens lamella and third annular lens lamella respectively, the periphery on third annular lens lamella along with the interior sphere of lens body is all along aligning.
In an achievable technical solution of the present application, the first annular lens sheet includes eight equal first fresnel lens elements, and the eight first fresnel lens elements are uniformly and symmetrically arranged around a central point of the central lens sheet in an array;
the second annular lens sheet layer comprises twelve equal second Fresnel lens elements which are uniformly and symmetrically arranged in an array around the central point of the central lens sheet layer;
the third annular lens sheet layer comprises twelve equal third Fresnel lens elements, and the twelve third Fresnel lens elements are uniformly and symmetrically arranged around the central point of the central lens sheet layer in an array mode.
In the technical scheme that can realize of this application, the lens body includes spherical surface portion and annular installation department, the annular installation department connect in the week edge of the interior sphere of spherical surface portion, the centre of sphere of spherical surface portion is located on the central axis of annular installation department.
In an achievable solution of the present application, the end of the annular mounting portion remote from the spherical portion is provided with one or more positioning grooves.
In an achievable technical solution of the present application, one or more snap holes are provided on the annular mounting portion.
In a second aspect, the application provides a detector, including installation base, infrared detector body and as above-mentioned spherical array fresnel lens, the infrared detector body install in on the installation base, this internal pyroelectric sensor that is provided with of infrared detector, spherical array fresnel lens install in the infrared detector body is kept away from the tip of installation base.
In a third aspect, the application provides a security system, which employs the above detector.
In summary, the present application includes at least one of the following beneficial effects:
1. the spherical surface part provided with the inner spherical surface and the outer spherical surface is designed in a completely symmetrical mode, and a plurality of groups of annular lens sheets are arranged in a circle around the central lens sheet layer and also designed in a symmetrical mode, so that no matter the spherical array Fresnel lens is installed on a wall or a roof, the thermal infrared light emitted by a heating object can be focused on the spherical center position of the inner spherical surface through the lens body and the Fresnel lens element, so that under the condition of meeting the requirements of detection angle and detection distance, the spherical array Fresnel lens can be simultaneously suitable for a wall-mounted installation mode and a ceiling-mounted installation mode, different use scenes can be met, and the market competitiveness is stronger;
2. because the Fresnel lens elements are designed in the layout mode, the spherical array Fresnel lens is small in size, thin in thickness and low in manufacturing cost under the condition that the requirements of detection angles and detection distances are met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a spherical array fresnel lens provided in an embodiment of the present application.
Fig. 2 is a schematic cross-sectional structural diagram of a lens body in an embodiment of the present application.
Fig. 3 is a schematic layout diagram of all fresnel lens elements in the embodiment of the present application.
Fig. 4 is a schematic structural diagram of one of the fresnel lens elements in the embodiment of the present application.
Fig. 5 is a schematic distribution diagram of a central lens sheet in an embodiment of the present application.
Fig. 6 is a schematic distribution diagram of a first annular lens sheet layer in an embodiment of the present application.
FIG. 7 is a schematic view of the distribution of the second annular lens layer in the embodiment of the present application.
Fig. 8 is a schematic distribution diagram of a third annular lens sheet layer in the embodiment of the present application.
FIG. 9 is a schematic distribution diagram of Fresnel lens elements of a near multi-vision area in an embodiment of the present application.
Fig. 10 is a schematic diagram illustrating the distribution of fresnel lens elements separated from a multi-vision region in an embodiment of the present application.
FIG. 11 is a schematic diagram illustrating the distribution of Fresnel lens elements of the remote multi-vision zone in the embodiment of the present application.
Fig. 12 is a side view of an effective detection area of a spherical array fresnel lens in a wall-mounted manner according to an embodiment of the present disclosure.
Fig. 13 is a top view of an effective detection area of a spherical array fresnel lens in a wall-mounted manner according to an embodiment of the present disclosure.
FIG. 14 is a side view of an effective detection area of a spherical array Fresnel lens in a ceiling-mounted manner according to an embodiment of the present disclosure.
Fig. 15 is a top view of an effective detection area of a spherical array fresnel lens in a ceiling-mounted manner according to an embodiment of the present application.
Fig. 16 is a schematic structural diagram of a detector provided in an embodiment of the present application in a wall-mounted manner.
Fig. 17 is a schematic structural diagram of a detector provided in an embodiment of the present application in a ceiling-mounted manner.
Wherein, in the figures, the respective reference numerals:
101. installing a base;
102. an infrared detector body; 21. a pyroelectric sensor;
103. a spherical array Fresnel lens; 31. a lens body; 311. a spherical surface portion; 312. an annular mounting portion; 3121. positioning a groove; 3122. a snap-in hole; 32. a central lens sheet layer; 33. a first annular lens sheet layer; 331. a first Fresnel lens element; 34. a second annular lens sheet layer; 341. a second Fresnel lens element; 35. a third annular lens layer; 351. a third Fresnel lens element; 300. a fresnel tooth.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 17, a spherical array fresnel lens, a detector and a security system according to an embodiment of the present application will be described.
The embodiment of the present application provides a spherical array fresnel lens, please refer to fig. 1 to 3, which includes a lens body 31, the lens body 31 has an inner spherical surface and an outer spherical surface, the outer spherical surface is a smooth curved surface, and the inner spherical surface is formed by fresnel teeth processed by a convolution body.
The fresnel lens with spherical array is mainly made of high-density polyethylene material, and the lens body 31 includes a spherical portion 311 and an annular mounting portion 312 which are integrally formed, the fresnel lens elements are mounted on the inner spherical surface of the spherical portion 311, the annular mounting portion 312 is connected to the periphery of the inner spherical surface of the spherical portion 311, the center of the spherical portion 311 is located on the central axis of the annular mounting portion 312, and the diameter of the periphery of the spherical portion 311 is slightly larger than the outer diameter of the annular mounting portion 312.
In other embodiments, the number of the positioning grooves 3121 may also be two, three or more.
Four buckle holes 3122 are provided on the annular mounting portion 312, the four buckle holes 3122 are evenly symmetrical and arranged at intervals along the annular mounting portion 312, the shape of the buckle hole 3122 is roughly square, and moreover, four corners of the buckle hole 3122 are designed to be arc corners. When the installation of buckle hole 3122 mainly used this spherical array fresnel lens is fixed, carry out the joint with other mounting structure (can block into the elastic bulge structure of buckle hole 3122) and fix, and then the mounted position can be more accurate, and connection structure is more firm moreover.
The center of the inner spherical surface of the lens body 31 is provided with a central lens sheet layer 32, the inner spherical surface of the lens body 31 is also provided with a plurality of groups of annular lens sheet layers, the annular lens sheet layer positioned at the innermost circle is arranged around the central lens sheet layer 32, and the annular lens sheet layer at the adjacent outer circle is arranged around the annular lens sheet layer at the adjacent inner circle.
Referring to fig. 3 and 5, the central lens sheet 32 includes a fresnel lens element, and the annular lens sheet includes a plurality of fresnel lens elements, which are integrally injection-molded with the lens body 31. The focal length of each Fresnel lens element is smaller than the radius of curvature of the inner surface of the lens body 31 at the position of the Fresnel lens element.
The height of the fresnel tooth 300 is between 0.15 and 0.25 mm, the height of the fresnel tooth 300 is preferably 0.2 mm in the present embodiment, the thickness of the fresnel lens element is between 0.5 and 1.0 mm, and the thickness of the fresnel lens element is preferably 0.8 mm in the present embodiment. The thinner the thickness of the fresnel lens element is, the better the refractive light gathering effect is, provided the intensity allows.
In this embodiment, the annular lens sheets are provided with three groups, which are respectively a first annular lens sheet 33, a second annular lens sheet 34 and a third annular lens sheet 35, and the outer peripheral edge of the third annular lens sheet 35 is aligned with the inner spherical peripheral edge of the lens body 31.
In other embodiments, the number of the annular lens sheets may be two, four, five or even more, and may be specifically designed according to the size, size and functional requirements of the spherical array fresnel lens.
Referring to fig. 2 and 4, the outer surface of the fresnel lens element is fitted to the inner spherical surface of the lens body 31, and the inner surface of the fresnel lens element is provided with a plurality of concentrically arranged fresnel teeth 300. Under the action of the fresnel teeth 300, the thermal infrared light is refracted by the fresnel lens element and is collected to the spherical center position of the inner spherical surface, and the spherical center position is just provided with a pyroelectric sensor (see fig. 16 or 17).
Referring to fig. 3 and 6, the first annular lenticular sheet 33 comprises eight equal first fresnel lens elements 331, the eight first fresnel lens elements 331 being arranged in a uniform symmetric array around a centre point of the central lenticular sheet 32.
Referring to fig. 3 and 7, the second annular lenticular sheet 34 includes twelve equal second fresnel lens elements 341, the twelve second fresnel lens elements 341 being arranged in a uniform symmetric array around the center point of the central lenticular sheet 32.
Referring to fig. 3 and 8, third annular lenticular sheet layer 35 comprises twelve equal third fresnel lens elements 351, the twelve third fresnel lens elements 351 being arranged in a uniform symmetric array around the centre point of central lenticular sheet layer 32.
In this embodiment, when the spherical array fresnel lens is mounted on a wall, all fresnel lens elements are divided into three multi-vision regions: near multi-vision area, intermediate multi-vision area, far multi-vision area.
Referring to fig. 3 and 9, all fresnel lens elements of the far multi-vision region are in a straight line and include one fresnel lens element of the center lens sheet 32, two first fresnel lens elements 331 of the first annular lens sheet 33, two second fresnel lens elements 341 of the second annular lens sheet 34, and two third fresnel lens elements 351 of the third annular lens sheet 35.
Two of the first fresnel lens elements 331 are symmetrically arranged on both sides of the fresnel lens element of the center lens sheet 32, two of the second fresnel lens elements 341 are symmetrically arranged on both sides of the fresnel lens element of the center lens sheet 32, and two of the third fresnel lens elements 351 are symmetrically arranged on both sides of the fresnel lens element of the center lens sheet 32.
Referring to fig. 3 and 10, all fresnel lens elements of the intermediate multi-vision region are divided into two groups and located on both sides of all fresnel lens elements of the far multi-vision region, respectively, and include all first fresnel lens elements 331 of the first annular lens sheet layer 33 excluding those belonging to the far multi-vision region, all second fresnel lens elements 341 of the second annular lens sheet layer 34 excluding those belonging to the far multi-vision region, and four third fresnel lens elements 351 of the third annular lens sheet layer 35 near the far multi-vision region.
Referring to fig. 3 and 11, all the fresnel lens elements of the near multi-vision region are divided into two groups and symmetrically arranged at both sides of all the fresnel lens elements of the far multi-vision region, respectively, the fresnel lens elements of the near multi-vision region include the remaining six third fresnel lens elements 351 in the third annular lens layer 35, and the three third fresnel lens elements 351 are one group.
In this embodiment, when the spherical array fresnel lens is mounted on a wall, the spherical array fresnel lens is at a position with a height of 2.2 meters, the detection range of the spherical array fresnel lens is 90 degrees from a top view, and the side-view distance is 1-8 meters and is in a three-dimensional fan shape, specifically, fig. 12 is a side view of the effective detection area of the spherical array fresnel lens in the above state, and fig. 13 is a top view of the effective detection area of the spherical array fresnel lens in the above state.
In this embodiment, when the spherical array fresnel lens is in a ceiling-mounted manner, the spherical array fresnel lens is at a position with a height of 3.6 meters, a detection range of the spherical array fresnel lens is 360 degrees, and the spherical array fresnel lens has a diameter of 8 meters and is conical, specifically, fig. 14 is a side view of an effective detection area of the spherical array fresnel lens in the above state, and fig. 15 is a top view of the effective detection area of the spherical array fresnel lens in the above state.
The application provides a spherical array fresnel lens's theory of operation does:
the spherical part 311 provided with the inner spherical surface and the outer spherical surface is designed in a completely symmetrical manner, and a plurality of groups of annular lens sheets are arranged around the central lens sheet 32 in a circle, and is also designed in a symmetrical manner, the inner surface based on the Fresnel lens element is provided with a plurality of Fresnel teeth 300 concentrically arranged, so that no matter the spherical array Fresnel lens is installed on a wall or a roof, the thermal infrared light emitted by a heating object can penetrate through the lens body 31 and the Fresnel lens element and then is focused on the spherical center position of the inner spherical surface, the pyroelectric sensor is arranged in the spherical center position in a matching manner, the detection area is divided into a plurality of transparent areas and dark areas, and the moving object entering the detection area can generate a variable pyroelectric infrared signal on the pyroelectric sensor in a temperature change manner.
Compared with the prior art, the spherical array Fresnel lens provided by the application has the following expectable technical effects:
under the requirement that satisfies detection angle and detection distance, this spherical array fresnel lens can be applicable to hanging mounting means and ceiling mounting means simultaneously, can satisfy different use scenes, and market competition is stronger, and because of fresnel lens unit adopts above-mentioned layout design, spherical array fresnel lens's volume is less, thickness is thinner, the cost of manufacture is lower.
The embodiment of the present application further provides a detector, please refer to fig. 16 and 17, which includes a mounting base 101, an infrared detector body 102, and the above spherical array fresnel lens 103, where the infrared detector body 102 is mounted on the mounting base 101, a pyroelectric sensor 21 is disposed in the infrared detector body 102, the spherical array fresnel lens 103 is mounted at an end of the infrared detector body 102 far from the mounting base, and the spherical array fresnel lens 103 is mounted in a common snap-fit connection.
The infrared detector body 102 and the spherical array fresnel lens 103 together form a roughly spherical center structure, fig. 16 is a schematic structural view of the detector in a wall-mounted mounting manner, and fig. 17 is a schematic structural view of the detector in a ceiling-mounted mounting manner.
The detector can be a passive infrared intrusion detector or an infrared microwave comprehensive detector.
The embodiment of the application also provides a security system, and the detector is adopted.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A spherical array Fresnel lens is characterized by comprising a lens body, wherein the lens body is provided with an inner spherical surface and an outer spherical surface;
the center of the inner spherical surface of the lens body is provided with a central lens sheet layer, the inner spherical surface of the lens body is also provided with a plurality of groups of annular lens sheet layers, the annular lens sheet layer positioned at the innermost circle is arranged around the central lens sheet layer, and the annular lens sheet layer positioned at the adjacent outer circle is arranged around the annular lens sheet layer positioned at the adjacent inner circle;
the central lens sheet layer comprises a Fresnel lens element, and the annular lens sheet layer comprises a plurality of Fresnel lens elements.
2. The spherical array fresnel lens according to claim 1, wherein: the focal length of each Fresnel lens element is smaller than the curvature radius of the inner surface of the lens body at the position of the Fresnel lens element.
3. The spherical array fresnel lens according to claim 1, wherein: the tooth height of the Fresnel lens element is 0.15-0.25 mm, and the thickness of the Fresnel lens element is 0.5-1.0 mm.
4. The spherical array fresnel lens according to claim 1, wherein: the interior sphere of lens body is provided with three groups annular lens lamella, three groups the annular lens lamella is first annular lens lamella, second annular lens lamella and third annular lens lamella respectively, the periphery on third annular lens lamella along with the interior sphere of lens body is all along aligning.
5. The spherical array Fresnel lens according to claim 4, wherein: the first annular lens sheet layer comprises eight equal first Fresnel lens elements, and the eight first Fresnel lens elements are uniformly and symmetrically arranged around the central point of the central lens sheet layer in an array manner;
the second annular lens sheet layer comprises twelve equal second Fresnel lens elements which are uniformly and symmetrically arranged in an array around the central point of the central lens sheet layer;
the third annular lens sheet layer comprises twelve equal third Fresnel lens elements, and the twelve third Fresnel lens elements are uniformly and symmetrically arranged around the central point of the central lens sheet layer in an array mode.
6. A spherical array Fresnel lens as claimed in any one of claims 1 to 5 wherein: the lens body includes spherical surface portion and annular installation department, the annular installation department connect in the periphery of the interior sphere of spherical surface portion, the centre of sphere of spherical surface portion is located on the central axis of annular installation department.
7. The spherical array fresnel lens according to claim 6, wherein: the end part of the annular mounting part, which is far away from the spherical part, is provided with one or more positioning grooves.
8. The spherical array fresnel lens according to claim 6, wherein: one or more clamping holes are formed in the annular mounting portion.
9. A probe, characterized by: the solar thermal infrared detector comprises a mounting base, an infrared detector body and the spherical array Fresnel lens as claimed in any one of claims 1 to 8, wherein the infrared detector body is mounted on the mounting base, a pyroelectric sensor is arranged in the infrared detector body, and the spherical array Fresnel lens is mounted at the end of the infrared detector body far away from the mounting base.
10. The utility model provides a security protection system which characterized in that: use of a detector as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466155.9A CN114839707A (en) | 2022-04-29 | 2022-04-29 | Spherical array Fresnel lens, detector and security system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466155.9A CN114839707A (en) | 2022-04-29 | 2022-04-29 | Spherical array Fresnel lens, detector and security system |
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| Publication Number | Publication Date |
|---|---|
| CN114839707A true CN114839707A (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210466155.9A Pending CN114839707A (en) | 2022-04-29 | 2022-04-29 | Spherical array Fresnel lens, detector and security system |
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| Country | Link |
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| CN (1) | CN114839707A (en) |
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2022
- 2022-04-29 CN CN202210466155.9A patent/CN114839707A/en active Pending
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