CN216116373U - Lens structure and detector - Google Patents

Abstract

The application provides a lens structure and a detector, wherein the lens structure comprises a lens body, and the lens body is provided with a light incident surface and a light emitting surface which are arranged along a first direction in a reverse manner; the light emitting surface of the lens body is provided with a plurality of continuously arranged focusing areas, and a plurality of sheet lenses are arranged in the focusing areas; the light-emitting surface of at least part of the sheet-shaped lenses in each focusing area inclines relative to the vertical plane of the first direction, and the inclination angles of the light-emitting surface of each sheet-shaped lens relative to the vertical plane of the first direction can be different; the sheet-shaped lenses in the plurality of focusing areas are used for focusing incident light in different detection areas to the sensing element. The detector comprises a sensing element and a lens structure. By adopting the technical scheme, the design of each sheet-shaped lens in each focusing area is very flexible, so that the focusing effect of the lens structure is improved, the lens structure can meet the focusing requirements of higher requirements and larger detection interval range, and the identification sensitivity of the sensing element is improved.

Description

Lens structure and detector

Technical Field

The application belongs to the technical field of optics, and particularly relates to a lens structure and a detector.

Background

The detector usually adopts a mode that a sensing element is matched with a Fresnel lens to identify the human body movement condition in a detection interval, wherein the Fresnel lens is used for focusing infrared light generated when a human body moves in the detection interval into the sensing element so that the sensing element generates a corresponding electric signal; for example, the sensing element may signal an alarm, turn on a light, or open a door.

The fresnel lens generally includes a plurality of fresnel lens units that are arranged in an array, and the fresnel teeth of each fresnel lens unit are all circular rings, so that the focuses of each fresnel lens unit are different, and thus, the fresnel lens has a phenomenon that infrared light cannot be completely focused on the sensing element, that is, the focusing effect of the fresnel lens is poor, and the recognition sensitivity of the sensing element is affected.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the embodiment of the application is as follows: the utility model provides a lens structure, aims at solving among the prior art, the focusing effect of fresnel lens is poor to lead to the technical problem that the discernment sensitivity of sensing element is low.

In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:

the lens structure comprises a lens body, wherein the lens body is provided with a light incident surface and a light emergent surface which are arranged along a first direction in a reverse manner; the light emitting surface of the lens body is provided with a plurality of continuously arranged focusing areas, and a plurality of sheet lenses distributed in an array are arranged in the focusing areas; the light-emitting surface of at least part of the sheet-shaped lenses in each focusing area is inclined relative to the vertical plane of the first direction, and the inclination angles of the light-emitting surface of each sheet-shaped lens relative to the vertical plane of the first direction can be different; the sheet-shaped lenses in the plurality of focusing areas are used for focusing incident light of different detection intervals to the sensing element.

In one embodiment, a light emitting surface of the lens body is sequentially divided into a first light adjusting region, a second light adjusting region and a third light adjusting region along a longitudinal direction, and the first light adjusting region, the second light adjusting region and the third light adjusting region are all provided with a plurality of focusing regions; in any one of the first light adjusting region, the second light adjusting region and the third light adjusting region, a plurality of focusing regions are sequentially arranged along the transverse direction; wherein, the longitudinal direction, the transverse direction and the first direction are mutually vertical in pairs.

In one embodiment, in at least one of the focusing regions, at least one of the sheet lenses is a reference lens, and a plurality of the sheet lenses are tilt lenses; the light emitting surface of the reference lens is perpendicular to the first direction, the inclined lenses surround the reference lens and are far away from the reference lens and are sequentially arranged outwards, and the light emitting surface of each inclined lens is inclined relative to the vertical plane of the first direction.

In one embodiment, in at least one of the focusing regions, in a direction in which the plurality of tilted lenses are sequentially arranged outward around the reference lens, an inclination angle of the light exit surface of the tilted lens with respect to a vertical plane of the first direction gradually increases.

In one embodiment, in any one of the first dimming region, the second dimming region, and the third dimming region, the focusing region located at the middle in the lateral direction has at least one of the reference lens and the plurality of the tilt lenses; in the focusing regions on both sides in the lateral direction, part of the focusing regions have at least one of the reference lenses and a plurality of the tilt lenses, and part of the sheet-like lenses in the focusing regions are the tilt lenses.

In one embodiment, the number of the reference lenses is a first number in the focus region located at an intermediate position of the first dimming region in the lateral direction; in the other focusing regions except the focusing region located at the middle position of the first dimming region, the number of the reference lenses of each focusing region is a second number, the first number is greater than the second number, and the reference lenses of the focusing regions located at the middle position of the first dimming region are used for facing the sensing element.

In one embodiment, the tilted lens includes an exit surface, a first connection surface, and a second connection surface, the exit surface, the first connection surface, and the second connection surface being connected to each other two by two; a side end of the exit surface far away from the first connecting surface and the first connecting surface are respectively connected to two longitudinally adjacent sheet-shaped lenses, and a side end of the exit surface far away from the second connecting surface and the second connecting surface are respectively connected to two transversely adjacent sheet-shaped lenses; the first connection face and/or the second connection face of at least one of the tilt lenses is connected to a lateral end of the reference lens.

In one embodiment, the first connection face and the second connection face are both perpendicular to a vertical plane of the first direction.

The embodiment also provides a detector, which comprises a sensing element and the lens structure, wherein the light-sensitive surface of the sensing element is arranged at the focusing position of the lens structure.

In one embodiment, a light emitting surface of the lens body is sequentially divided into a first light adjusting region, a second light adjusting region and a third light adjusting region along a longitudinal direction, and the first light adjusting region, the second light adjusting region and the third light adjusting region are all provided with a plurality of focusing regions; in any one of the first light adjusting region, the second light adjusting region and the third light adjusting region, a plurality of focusing regions are sequentially arranged along the transverse direction; wherein, the longitudinal direction, the transverse direction and the first direction are mutually vertical;

in the focusing area which is transversely positioned in the middle of the first dimming area, at least one sheet-shaped lens is a reference lens, and the light-emitting surface of the reference lens is perpendicular to the first direction and is just opposite to the photosensitive surface of the sensing element.

The beneficial effect of the lens structure that this application embodiment provided lies in: compared with the prior art, in the present application, a plurality of focusing regions on the lens body are provided with a plurality of sheet-shaped lenses distributed in an array, at least a part of the sheet-shaped lenses in each focusing region are arranged in an inclined manner relative to a vertical plane in the first direction, and the inclined angles of the sheet-shaped lenses relative to the vertical plane in the first direction may be different, so that when designing the lens structure, the inclined angles of the sheet-shaped lenses in each focusing region relative to the vertical plane in the first direction can be correspondingly set according to actual focusing requirements, and thus, the design of the sheet-shaped lenses in each focusing region is very flexible, so that the design of the lens structure is very flexible, which is helpful for making the focal point of each focusing region the same, that is, making the plurality of focusing regions in the lens structure focus incident light in a plurality of different detection regions to the sensing element, the focusing effect of the lens structure is improved, and the lens structure can meet the focusing requirements of higher requirements and larger detection range, so that the identification sensitivity of the sensing element is improved. Correspondingly, the detector with the lens structure also has the advantage of better focusing effect, so that the detection sensitivity and the detection effect of the detector are improved.

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 perspective view of a lens structure provided in an embodiment of the present application in cooperation with a sensor element;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a front view of the lens structure provided in FIG. 1;

FIG. 4 is a light path diagram in the vertical direction of the lens arrangement provided in FIG. 1;

FIG. 5 is a horizontal view of the optical path of the lens arrangement provided in FIG. 1;

FIG. 6 is a perspective cross-sectional view of FIG. 3;

fig. 7 is a partial enlarged view of fig. 6 at B.

Wherein, in the figures, the respective reference numerals:

10-a lens structure; 11-a lens body; 12-a focus area; 121-a sheet lens; 121 a-reference lens; 121 b-tilt lens; 1211b — an exit surface; 1212 b-a first connection face; 1213 b-second connection face; 20-a sensing element; z-a first direction; y-longitudinal direction; x-transverse direction; a-a first dimming area; b-a second dimming area; c-third dimming area.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to 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, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

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, wherein two or more includes two.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following detailed description is made with reference to the accompanying drawings and examples:

example one

Referring to fig. 1 and fig. 2, a lens structure 10 according to an embodiment of the present disclosure is mainly used for focusing incident light onto a sensing element 20; the sensing element 20 is disposed at an interval on one side of the light emitting surface of the lens structure 10, and the light sensing surface of the sensing element 20 is disposed at the focusing position of the lens structure 10, so that the lens structure 10 can focus the incident light to the sensing element 20. It should be noted that, in practical applications, when a human body moves in a detection zone of the detector, the human body generates infrared light due to a temperature difference between a human body temperature and an ambient temperature, and the infrared light is incident on the lens structure 10 and focused on the sensing element 20 under the focusing action of the lens structure 10, so that the sensing element 20 emits a corresponding electrical signal; wherein, the electric signal can be a control signal for opening a door, turning on a light, alarming and the like; the detector can also be used for identifying other moving objects except human bodies.

In an embodiment, the lens structure 10 includes a lens body 11, the lens body 11 has a light incident surface and a light emitting surface opposite to each other along the first direction Z, and the light incident surface and the light emitting surface are respectively disposed on two opposite sides of the lens body 11 along the first direction Z. The light-emitting surface of the lens body 11 is provided with a plurality of focusing areas 12, and the focusing areas 12 are continuously arranged; a plurality of sheet-shaped lenses 121 distributed in an array are arranged in each focusing area 12, wherein the plurality of sheet-shaped lenses 121 in each focusing area 12 are continuously arranged, and each sheet-shaped lens 121 has a focusing function; thus, the light exiting surface of the lens body 11 has a plurality of sheet-shaped lenses 121, the plurality of sheet-shaped lenses 121 on the light exiting surface of the lens body 11 are continuously disposed, and the incident light enters the lens body 11 through the light entering surface of the lens body 11 and exits from the plurality of sheet-shaped lenses 121 on the light exiting surface of the lens body 11 to be focused on the sensor element 20. It should be noted that, the plurality of sheet-shaped lenses 121 on the light-emitting surface of the lens body 11 are disposed, so that the light-emitting surface of the lens body 11 is subdivided into a plurality of sheet-shaped portions, and incident lights in different directions exit through different sheet-shaped lenses 121 to be focused on the sensing element 20. It should be noted that the sheet-shaped lens 121 in the plurality of focusing regions 12 on the light-emitting surface of the lens body 11 is configured to focus the incident light of a plurality of different detection regions to the sensing element 20, and each focusing region 12 is configured to focus the incident light of the corresponding detection region to the sensing element 20; wherein, the incident direction of the incident light in the multiple detection regions can be different. The number of the focusing areas 12 may be set according to the range of the detection interval where the incident light required to be focused by the lens structure 10 is located, and is not limited herein.

The light-emitting surface of at least part of the sheet lens 121 in each focusing area 12 is inclined with respect to the vertical plane of the first direction Z; a vertical plane of the first direction Z refers to a plane perpendicular to the first direction Z, and the light emitting surface of the sheet-shaped lens 121 is disposed obliquely with respect to the plane perpendicular to the first direction Z. It can be understood that in any one of the focusing regions 12, the light emitting surfaces of all the sheet lenses 121 are disposed obliquely with respect to the vertical plane of the first direction Z; alternatively, in any one of the focusing regions 12, the light emitting surface of one part of the sheet-shaped lens 121 is disposed obliquely with respect to the vertical plane of the first direction Z, and the light emitting surface of the other part of the sheet-shaped lens 121 is disposed in parallel with respect to the vertical plane of the first direction Z. Wherein at least part of the sheet-shaped lens 121 is arranged obliquely with respect to a perpendicular plane to the first direction Z, which facilitates focusing of incident light onto the sensor element 20 by refraction of the obliquely arranged sheet-shaped lens 121.

The light-emitting surface of each sheet lens 121 may be inclined at different angles with respect to a vertical plane in the first direction Z; it can be understood that, in the plurality of sheet-shaped lenses 121 on the lens body 11, the inclination angles of the light exit surfaces of all the sheet-shaped lenses 121 are different; alternatively, in the plurality of sheet-shaped lenses 121 of the lens body 11, the inclination angles of the light emitting surfaces of some of the sheet-shaped lenses 121 are different, and the inclination angles of the light emitting surfaces of other some of the sheet-shaped lenses 121 are the same. It should be noted that the inclination angles of the light-emitting surfaces of the sheet-shaped lenses 121 may be different, so that the inclination angles of the light-emitting surfaces of the sheet-shaped lenses 121 of the lens structure 10 may not be limited, and the inclination angles of the light-emitting surfaces of the sheet-shaped lenses 121 may be adjusted according to actual situations, that is, the inclination angles of the light-emitting surfaces of the sheet-shaped lenses 121 may be freely set, so that the design flexibility of the sheet-shaped lenses 121 is very high.

In the embodiment of the present application, a plurality of focusing areas 12 are disposed on the light emitting surface of the lens body 11, each focusing area 12 has a plurality of sheet-shaped lenses 121, at least a part of the light emitting surfaces of the sheet-shaped lenses 121 in each focusing area 12 is disposed in an inclined manner with respect to a vertical plane of the first direction Z, and the inclined angles of the light emitting surfaces of the sheet-shaped lenses 121 with respect to the vertical plane of the first direction Z may be different; it should be noted that the plurality of sheet-shaped lenses 121 in each focusing area 12 subdivide the light exit surface of the focusing area 12 into a plurality of sheet-shaped portions, each sheet-shaped lens 121 has a focusing function, and the inclination angle of the light exit surface of each sheet lens 121 in each focusing area 12 can be freely set, so that, when designing a focusing region 12, according to the requirement that the focusing region 12 focuses the incident light in the detection interval corresponding to the focusing region to the sensing element 20, the tilt angle and the corresponding parameters of the light-exiting surface of each sheet lens 121 can be designed correspondingly from each sheet lens 121 in the focusing region 12, so that the structural design of the sheet lens 121 is more flexible, and thus, the focusing region 12 can focus incident light in any direction after design, so that the focusing region 12 can focus the incident light in the detection zone corresponding to the focusing region to the sensing element 20. Thus, when designing the lens structure 10, the inclination angle of the light-emitting surface of each sheet-shaped lens 121 in each focusing area 12 relative to the vertical plane of the first direction Z can be set correspondingly according to the actual focusing requirement, so that the design of each sheet-shaped lens 121 in each focusing area 12 is very flexible, so that the design of the lens structure 10 is very flexible, which is beneficial to making the focal point of each focusing area 12 the same, that is, making the plurality of focusing areas 12 in the lens structure 10 focus the incident light in a plurality of different detection intervals to the sensing element 20, and improving the focusing effect of the lens structure 10, so that the lens structure 10 can meet the focusing requirement of higher requirement and larger detection interval range, thereby being beneficial to improving the recognition sensitivity of the sensing element 20. The actual focusing requirement specifically includes the incident direction of the incident light in the detection interval corresponding to the focusing region 12 and the specific position of the sensing element 20, that is, the actual focusing requirement is a requirement that each focusing region 12 needs to focus the incident light in the detection interval corresponding to the focusing region onto the sensing element 20.

Moreover, the inclination angle of the sheet-shaped lens 121 in each focusing area 12 can be adjusted according to actual conditions, and when the lens structure 10 is designed, the lens structure 10 is beneficial to focusing incident light in a larger detection interval range, so that the detection range of the detector is enlarged.

In addition, because the inclination angles of the sheet-shaped lenses 121 in each focusing region 12 can be adjusted according to actual conditions, the structural design of the lens structure 10 is more flexible, and thus, the appearance surfaces of the lens structure 10 on the light incident surface side and the light emergent surface side can be more flexibly designed to be complex curved surfaces such as a plane, a cylindrical surface, a spherical surface, a free-form surface and the like, so that more appearance requirements can be met, and the attractiveness of the lens structure 10 can be improved.

Alternatively, the surface shape of the light-emitting surface of the sheet-shaped lens 121 may be a free-form surface, so that most of the differential part of the light-emitting surface of the sheet-shaped lens 121 is inclined with respect to the vertical plane of the first direction Z.

In an embodiment, referring to fig. 1 to 3, a light emitting surface of the lens body 11 is sequentially divided into a first light adjusting area a, a second light adjusting area B and a third light adjusting area C along a longitudinal direction Y, and the first light adjusting area a, the second light adjusting area B and the third light adjusting area C are all provided with a plurality of focusing areas 12; the focusing regions 12 in the first light modulation area a, the second light modulation area B and the third light modulation area C are respectively used for focusing incident light from different detection intervals in the longitudinal direction Y to the sensor element 20. In any one of the first light adjusting area a, the second light adjusting area B, and the third light adjusting area C, a plurality of focusing regions 12 are sequentially arranged in a horizontal direction X; in this embodiment, the plurality of focusing regions 12 in the first dimming area a are sequentially arranged along the transverse direction X, and are configured to focus incident light from different detection regions in the transverse direction X to the sensing element 20; a plurality of focusing regions 12 in the second dimming region B are sequentially arranged along the transverse direction X and are used for focusing incident light from different detection regions in the transverse direction X to the sensing element 20; the plurality of focusing regions 12 in the third dimming region C are sequentially arranged along the transverse direction X, and are configured to focus incident light from different detection regions in the transverse direction X to the sensing element 20. The longitudinal direction Y, the transverse direction X, and the first direction Z are mutually perpendicular to each other, where perpendicular refers to the substrate being perpendicular, and it can be understood that there may be a certain deviation between the two mutually perpendicular directions.

As shown in fig. 1, the first direction Z is a direction parallel to the central axis of the lens structure 10, and in a normal use state of the lens structure 10, the vertical direction Y is a vertical direction and the horizontal direction X is a horizontal direction, but the vertical direction and the horizontal direction herein should not be limited to the structure of the lens structure 10. It should be noted that, the first light adjusting area a, the second light adjusting area B, and the third light adjusting area C are sequentially distributed along the vertical direction, and then the plurality of focusing regions 12 in the first light adjusting area a, the plurality of focusing regions 12 in the second light adjusting area B, and the plurality of focusing regions 12 in the third light adjusting area C are used to focus incident light from different detection sections in the vertical direction to the sensor element 20; the plurality of focusing regions 12 in the first light modulation region a, the second light modulation region B and the third light modulation region C are all used for focusing incident light from different detection regions in the horizontal direction on the sensing element 20. Thus, the first light adjusting area a, the second light adjusting area B and the third light adjusting area C are arranged, so that the plurality of focusing areas 12 of the lens structure 10 can focus the incident light rays from a plurality of different detection intervals in the vertical direction and the horizontal direction onto the sensing element 20, and the lens structure 10 can focus the incident light rays in a larger detection interval range, thereby increasing the detection range of the detector.

Optionally, the first light modulation region a has 7 focusing regions 12 arranged in the transverse direction X, the second light modulation region B has 7 focusing regions 12 arranged in the transverse direction X, and the third light modulation region C has 5 focusing regions 12 arranged in the transverse direction X. Thus, by adopting the technical scheme, the arrangement of the first light adjusting area A, the second light adjusting area B and the third light adjusting area C realizes the focusing of incident light in 3 different detection intervals in the vertical direction; the 7 focusing regions 12 in the first dimming region a achieve focusing of incident light in 7 different detection zones in the horizontal direction, the 7 focusing regions 12 in the second dimming region B achieve focusing of incident light in 7 different detection zones in the horizontal direction, and the 5 focusing regions 12 in the third dimming region C achieve focusing of incident light in 5 different detection zones in the horizontal direction. Thus, the lens structure 10 provided in this embodiment realizes focusing of incident light in 19 different detection regions, and greatly improves the range corresponding to the incident light that can be focused by the lens structure 10, thereby increasing the detection range of the detector.

Optionally, in this embodiment, as shown in fig. 4, the first light modulation area a, the second light modulation area B, and the third light modulation area C are arranged such that the angle range of the incident light that can be focused by the lens structure 10 in the vertical direction is 110 °; as shown in fig. 5, the arrangement of the 7 focusing regions 12 of the first light modulation zone a, the 7 focusing regions 12 of the second light modulation zone B, and the third light modulation zone C5 focusing regions 12 allows the lens structure 10 to focus incident light rays in the horizontal direction over an angular range of 30 °.

In one embodiment, referring to fig. 1 to 7, in at least one focusing region 12, at least one sheet lens 121 is a reference lens 121a, and a plurality of sheet lenses 121 are tilted lenses 121 b; the light emitting surface of the reference lens 121a is perpendicular to the first direction Z, the plurality of tilted lenses 121b are sequentially arranged outwards around the reference lens 121a and along a direction away from the reference lens 121a, and the light emitting surface of the tilted lenses 121b is tilted with respect to a perpendicular plane of the first direction Z.

It should be noted that the light emitting surface of the reference lens 121a is perpendicular to the first direction Z, that is, the light emitting surface of the reference lens 121a is parallel to a vertical plane of the first direction Z; the reference lens 121a is used to focus direct incident light to the sensing element 20, and it can be understood that the incident direction of the incident light is parallel to the optical axis of the reference lens 121 a. The light exit surface of the tilted lens 121b is tilted with respect to a vertical plane of the first direction Z, so that the tilted lens 121b serves to refract incident light to focus the incident light to the sensor element 20. In the focusing region 12 having the reference lens 121a and the tilted lens 121b, the reference lens 121a is used for focusing a portion of the incident light in the detection region corresponding to the focusing region 12, and the tilted lens 121b is used for focusing another portion of the incident light in the detection region corresponding to the focusing region 12.

It should be noted that, in at least one focusing region 12, the plurality of tilted lenses 121b collectively enclose the reference lens 121a, and the plurality of tilted lenses 121b are sequentially arranged outward in a direction away from the reference lens 121 a.

Note that, in any one of the focus regions 12, all the sheet lenses 121 are the inclined lenses 121 b; alternatively, in any one of the focus regions 12, one part of the sheet-shaped lenses 121 is a reference lens 121a, and the other part of the sheet-shaped lenses 121 is a tilt lens 121 b. Thus, by adopting the above technical solution, the sheet-shaped lens 121 in any one of the focusing areas 12 can be set as the reference lens 121a or as the tilted lens 121b according to the actual focusing requirement, so that only the tilted lens 121b or both the tilted lens 121b and the reference lens 121a are set in the focusing area 12, and thus, after the sheet-shaped lens 121 in the focusing area 12 is correspondingly designed, any one of the focusing areas 12 can focus the incident light in the detection zone corresponding to the sheet-shaped lens 121 to the sensing element 20, thereby improving the focusing effect of the lens structure 10; moreover, the tilt angles of the tilt lenses 121b may be set to be different, that is, the tilt lenses may be designed correspondingly according to actual focusing requirements, so that the design flexibility of each sheet lens 121 is very high, that is, the design flexibility of the lens structure 10 is very high, and then the lens structure 10 can focus incident light in a larger detection interval range, so as to contribute to improving the detection range of the detector.

Alternatively, the surface shape of the light-emitting surface of the reference lens 121a may be set as a free-form surface, so that most of the differential part of the light-emitting surface of the reference lens 121a is substantially perpendicular to the first direction Z; the surface shape of the light exit surface of the tilt lens 121b may be configured as a free-form surface, such that most of the differential portion of the light exit surface of the tilt lens 121b is disposed obliquely with respect to the vertical plane of the first direction Z.

In an embodiment, referring to fig. 1 and fig. 2, in at least one focusing region 12, in a direction in which the plurality of tilted lenses 121b are arranged around the reference lens 121a and outward in sequence, an inclination angle of a light-emitting surface of the tilted lens 121b with respect to a vertical plane of the first direction Z is gradually increased.

In the focusing area 12 having both the reference lens 121a and the tilted lens 121b, the tilt angle of the light exit surface of the tilted lens 121b with respect to the vertical plane of the first direction Z is larger in the direction away from the reference lens 121a along the tilted lens 121 b; of the incident light in the detection zone corresponding to the focusing region 12, a portion of the incident light has an incident direction parallel to the optical axis of the reference lens 121a and passes through the reference lens 121a when incident, and another portion of the incident light has an incident direction not parallel to the optical axis of the reference lens 121a and passes through the tilted lens 121b when incident; further, the incident direction of the incident light and the optical axis of the reference lens 121a gradually increase in a direction in which the tilt lens 121b moves away from the reference lens 121 a. In this way, in the direction in which the tilt lens 121b is far away from the reference lens 121a, the inclination angle of the light exit surface of the tilt lens 121b with respect to the vertical plane of the first direction Z is larger, so that the focusing region 12 can focus a plurality of kinds of incident light with different incident directions in the detection zone corresponding to the focusing region onto the sensing element 20, and thus, the focusing effect of each focusing region 12 is improved, and the focusing effect of the whole lens structure 10 is improved.

In one embodiment, referring to fig. 1 to 7 together, in any one of the first light modulation region a, the second light modulation region B and the third light modulation region C, the focusing region 12 located at the middle in the transverse direction X has at least one reference lens 121a and a plurality of inclined lenses 121B; in the focusing areas 12 located on both sides in the lateral direction X, the partial focusing area 12 has at least one reference lens 121a and a plurality of inclined lenses 121b, and each of the sheet lenses 121 in the partial focusing area 12 is an inclined lens 121 b. It is understood that in any one of the first light adjustment region a, the second light adjustment region B, and the third light adjustment region C, the focusing region 12 located in the middle in the transverse direction X is a middle focusing region 12, and the focusing regions 12 located on both sides of the middle focusing region 12 in the transverse direction X are side end focusing regions 12; wherein the intermediate focusing region 12 has therein at least one reference lens 121a and a plurality of tilt lenses 121 b; of the plurality of side-end focusing areas 12, a part of the focusing areas 12 has only the tilt lens 121b, and the other part of the focusing areas 12 includes at least one reference lens 121a and a plurality of tilt lenses 121 b.

It should be noted that the sheet-shaped lens 121 in each focusing area 12 is arranged in a type mainly for focusing the incident light in the detection region corresponding to the focusing area 12 to the sensing element 20, so that the sheet-shaped lens 121 in each focusing area 12 has very high design flexibility, and thus the structural design of the lens structure 10 is correspondingly more flexible, which is beneficial to improving the focusing effect of the lens structure 10 and the range of the detection region.

In one embodiment, referring to fig. 3, in the focusing region 12 located in the middle of the first dimming area a along the transverse direction X, the number of the reference lenses 121a is a first number; in the other focusing areas 12 except the focusing area 12 located in the middle of the first dimming area a, the number of the reference lenses 121a of each focusing area 12 is a second number, the first number is larger than the second number, and the reference lens 121a of the focusing area 12 located in the middle of the first dimming area a is used to face the sensor element 20.

In the focusing region 12 located at the middle position of the first dimming region a in the transverse direction X, if there are many incident light beams having incident directions parallel to the reference lenses 121a in the incident light in the detection section corresponding to the focusing region 12, the number of the reference lenses 121a in the focusing region 12 is large; in the other focusing areas 12 except the focusing area 12 located in the middle of the first dimming area a, the incident light beams of the incident light having the incident direction parallel to the reference lens 121a are fewer in the incident light in the detection zone corresponding to each focusing area 12, and accordingly, the number of the reference lenses 121a of the focusing area 12 is smaller. In this way, the number of the reference lenses 121a in each focusing area 12 is set, mainly for better focusing the incident light in the detection zone corresponding to each focusing area 12 to the sensing element 20, so that the flexibility of the design of the sheet-shaped lens 121 in each focusing area 12 is very high, the structural design of the lens structure 10 is correspondingly more flexible, and the focusing effect of the lens structure 10 and the range of the detection zone are improved.

In one embodiment, referring to fig. 6 and fig. 7, the tilted lens 121b includes an exit surface 1211b, a first connecting surface 1212b and a second connecting surface 1213b, and the exit surface 1211b, the first connecting surface 1212b and the second connecting surface 1213b are connected to each other two by two, that is, the exit surface 1211b, the first connecting surface 1212b and the second connecting surface 1213b are disposed adjacent to each other two by two; a side end of the exit surface 1211b away from the first connection surface 1212b in the longitudinal direction Y and the first connection surface 1212b are connected to two adjacent sheet lenses 121 in the longitudinal direction Y, respectively; a side end of the exit surface 1211b away from the second connection surface 1213b in the lateral direction X and the second connection surface 1213b, which are respectively connected to two sheet lenses 121 adjacent in the lateral direction X; the first connecting surface 1212b and/or the second connecting surface 1213b of at least one of the tilt lenses 121b is connected to the side end of the reference lens 121 a. In order to distinguish the light emitting surface of the reference lens 121a from the light emitting surface of the slant lens 121b, the light emitting surface of the slant lens 121b is set as the light emitting surface 1211 b.

It should be noted that the exit surface 1211b is far from a side end of the first connection surface 1212b and the first connection surface 1212b along the longitudinal direction Y, and both are connected to two adjacent sheet lenses 121 along the longitudinal direction Y. It is understood that one side end of the exit surface 1211b in the longitudinal direction Y is connected to the first connecting surface 1212b, and one side end of the exit surface 1211b in the longitudinal direction Y away from the first connecting surface 1212b is connected to the first connecting surface 1212b of one of the adjacent sheet lenses 121 in the longitudinal direction Y; one side end of the first connecting surface 1212b is connected to one side end of the exit surface 1211b in the longitudinal direction Y and coincides with the side end of the exit surface 1211b in the longitudinal direction Y, and the first connecting surface 1212b is connected to the exit surface 1211b of another adjacent sheet lens 121 in the longitudinal direction Y.

It should be noted that the exit surface 1211b is distant from a side end of the second connection surface 1213b and the second connection surface 1213b along the transverse direction X, and both are connected to two adjacent sheet lenses 121 along the transverse direction X. It is understood that one side end of the exit surface 1211b in the transverse direction X is connected to the second connection surface 1213b, and one side end of the exit surface 1211b in the transverse direction X, which is away from the second connection surface 1213b, is connected to the second connection surface 1213b of one of the adjacent sheet lenses 121 in the transverse direction X; one side end of the second connection surface 1213b is connected to one side end of the exit surface 1211b in the lateral direction X and coincides with the side end of the exit surface 1211b in the lateral direction X, and the second connection surface 1213b is connected to the exit surface 1211b of another sheet lens 121 adjacent in the lateral direction X.

It should be noted that, when the slant lens 121b and the reference lens 121a are adjacently disposed, a side end of the first connection surface 1212b of the slant lens 121b away from the exit surface 1211b and/or a side end of the second connection surface 1213b away from the exit surface 1211b are connected to a side end of the reference lens 121 a.

By adopting the above technical scheme, the plurality of sheet-shaped lenses 121 in each focusing area 12 are continuously arranged, and the sheet-shaped lenses 121 between adjacent focusing areas 12 are also continuously arranged, so that all the sheet-shaped lenses 121 on the lens structure 10 are continuously arranged, and thus, the light exit surfaces of all the sheet-shaped lenses 121 on the lens structure 10 form the light exit surface of the lens structure 10, when the lens structure 10 is designed, the inclination angles of the light exit surfaces of all the sheet-shaped lenses 121 on the lens structure 10 are correspondingly arranged one by one, so that the whole light exit surface of the lens structure 10 can focus incident light of a plurality of different detection intervals onto the sensing element 20, and the focusing effect of the lens structure 10 is improved.

In one embodiment, referring to fig. 7, the first connecting surface 1212b and the second connecting surface 1213b are perpendicular to a vertical plane of the first direction Z.

Generally, in a fresnel lens, when fresnel teeth of each fresnel lens unit are designed to be circular, based on design restrictions, auxiliary fresnel surfaces of each fresnel tooth form an included angle greater than 0 ° with a main axis of the fresnel lens, and when the fresnel lens is injection-molded by using a mold, the auxiliary fresnel surfaces form an included angle greater than 0 ° with the main axis of the fresnel lens, which may cause the fresnel lens to be difficult to demold and damage the fresnel lens after brute force demolding.

In this embodiment, the first connecting surfaces 1212b and the second connecting surfaces 1213b of all the inclined lenses 121b on the lens structure 10 are parallel to the first direction ZZ, that is, the first connecting surfaces 1212b and the second connecting surfaces 1213b are parallel to the central axis of the lens structure 10, so that the fresnel lens structure 10 is better demolded, and the damage of the lens structure 10 after demolding is reduced. The first connecting surface 1212b and the second connecting surface 1213b may be arc surfaces or flat surfaces.

Example two

Referring to fig. 1 to 7, based on the concept of the first embodiment, the present embodiment further provides a detector, which includes a sensing element 20 and a lens structure 10; the sensing element 20 is disposed at an interval on one side of the emitting surface 1211b of the lens structure 10, and the light-sensing surface of the sensing element 20 is disposed at the focusing position of the lens structure 10; it should be noted that, in practical applications, when a human body moves in a detection zone of the detector, due to a temperature difference between a temperature of the human body and an ambient temperature, the human body generates an infrared light, and the infrared light is incident to the lens structure 10, and the lens structure 10 focuses the infrared light to the sensing element 20, so that the sensing element 20 sends a corresponding electrical signal; wherein, the electric signal can be a control signal for opening a door, turning on a light, alarming and the like; the detector can also be used for identifying other moving objects except for human bodies. It should be noted that the lens structure 10 in this embodiment is the same as the lens structure 10 in the first embodiment, and specific reference is made to the description of the lens structure 10 in the first embodiment, which is not repeated herein.

In the present embodiment, by adopting the above technical solution, when designing the lens structure 10, the tilt angle of each sheet-shaped lens 121 in each focusing area 12 with respect to the vertical plane of the first direction Z can be correspondingly set according to the actual focusing requirement, so that the design of each sheet-shaped lens 121 in each focusing area 12 is very flexible, thereby, the design of the lens structure 10 is very flexible, which is helpful to make the focal point of each focusing region 12 the same, that is, the plurality of focusing regions 12 in the lens structure 10 can focus the incident light in a plurality of different detection regions to the sensing element 20, the focusing effect of the lens structure 10 is improved, the lens structure 10 is able to meet the focusing requirements of higher requirements and a larger detection range, thereby contributing to an improvement in the recognition sensitivity of the sensor element 20 and thus to an improvement in the detection sensitivity and detection effect of the detector.

In an embodiment, referring to fig. 1 to 3, a light emitting surface of the lens body 11 is sequentially divided into a first light adjusting area a, a second light adjusting area B and a third light adjusting area C along a longitudinal direction Y, and a plurality of focusing regions 12 are disposed in the first light adjusting area a, the second light adjusting area B and the third light adjusting area C; in any one of the first light adjusting region a, the second light adjusting region B, and the third light adjusting region C, a plurality of focusing regions 12 are sequentially arranged and continuously arranged along the transverse direction X; wherein, the longitudinal direction Y, the transverse direction X and the first direction Z are mutually vertical in pairs. In the focusing area 12 located at the middle of the first dimming area a in the transverse direction X, at least one sheet lens 121 is a reference lens 121a, and a light exit surface of the reference lens 121a is perpendicular to the first direction Z.

It should be noted that, in the present embodiment, the settings of the first light adjusting area a, the second light adjusting area B, the third light adjusting area C and the reference lens 121a on the lens body 11 are the same as the corresponding portions of the first embodiment, and specific reference may be made to the specific descriptions of the first light adjusting area a, the second light adjusting area B, the third light adjusting area C and the reference lens 121a in the first embodiment, which will not be described in detail here.

It should be further noted that, in the focusing region 12 located at the middle position of the first light modulation region a in the transverse direction X, the light emitting surface of the reference lens 121a is right opposite to the light sensing surface of the sensor element 20, that is, the optical axis of the reference lens 121a is closest to the focal point of the lens structure 10, so that, based on the design of the focusing region 12 located at the middle position of the first light modulation region a in the transverse direction X, the positional relationship between the sensor element 20 and the lens structure 10 is better determined, and the design convenience of the detector is improved.

The rest of this embodiment is the same as the first embodiment, and the unexplained features in this embodiment are explained by the first embodiment, which is not described herein again.

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 lens structure comprises a lens body, wherein the lens body is provided with a light incident surface and a light emergent surface which are arranged along a first direction in a reverse manner; the lens is characterized in that the light-emitting surface of the lens body is provided with a plurality of continuously arranged focusing areas, and a plurality of sheet-shaped lenses distributed in an array are arranged in the focusing areas; the light-emitting surface of at least part of the sheet-shaped lenses in each focusing area is inclined relative to the vertical plane of the first direction, and the inclination angles of the light-emitting surface of each sheet-shaped lens relative to the vertical plane of the first direction can be different; the sheet-shaped lenses in the plurality of focusing areas are used for focusing incident light of different detection intervals to the sensing element.

2. The lens structure of claim 1, wherein a first light modulation region, a second light modulation region and a third light modulation region are sequentially divided along a longitudinal direction of the light emitting surface of the lens body, and the first light modulation region, the second light modulation region and the third light modulation region are respectively provided with a plurality of focusing regions; in any one of the first light adjusting region, the second light adjusting region and the third light adjusting region, a plurality of focusing regions are sequentially arranged along the transverse direction; wherein, the longitudinal direction, the transverse direction and the first direction are mutually vertical in pairs.

3. The lens structure of claim 2, wherein at least one of said slab lenses in at least one of said focal zones is a reference lens, and a plurality of said slab lenses are tilt lenses; the light emitting surface of the reference lens is perpendicular to the first direction, the inclined lenses surround the reference lens and are far away from the reference lens and are sequentially arranged outwards, and the light emitting surface of each inclined lens is inclined relative to the vertical plane of the first direction.

4. The lens structure of claim 3, wherein in at least one of the focusing regions, an inclination angle of a light exit surface of the tilted lens with respect to a vertical plane of the first direction is gradually increased in a direction in which the plurality of tilted lenses are arranged sequentially outward around the reference lens.

5. The lens structure of claim 3, wherein in any one of the first dimming region, the second dimming region, and the third dimming region, the focusing region located at the middle in the lateral direction has at least one of the reference lens and the plurality of the tilt lenses; in the focusing regions on both sides in the lateral direction, part of the focusing regions have at least one of the reference lenses and a plurality of the tilt lenses, and part of the sheet-like lenses in the focusing regions are the tilt lenses.

6. The lens structure of claim 3, wherein the number of reference lenses is a first number in the focus region located at an intermediate position of the first dimming region in a lateral direction; in the other focusing regions except the focusing region located at the middle position of the first dimming region, the number of the reference lenses of each focusing region is a second number, the first number is greater than the second number, and the reference lenses of the focusing regions located at the middle position of the first dimming region are used for facing the sensing element.

7. The lens structure of claim 3, wherein the tilted lens comprises an exit face, a first connecting face and a second connecting face, the exit face, the first connecting face and the second connecting face being connected to each other two by two; a side end of the exit surface far away from the first connecting surface and the first connecting surface are respectively connected to two longitudinally adjacent sheet-shaped lenses, and a side end of the exit surface far away from the second connecting surface and the second connecting surface are respectively connected to two transversely adjacent sheet-shaped lenses; the first connection face and/or the second connection face of at least one of the tilt lenses is connected to a lateral end of the reference lens.

8. The lens structure of claim 7, wherein the first connection face and the second connection face are each perpendicular to a vertical plane of the first direction.

9. A detector comprising a sensor element, characterized in that it further comprises a lens structure according to any of claims 1-8, the light-sensitive surface of the sensor element being arranged at the focus of the lens structure.

10. The detector of claim 9, wherein a light emitting surface of the lens body is longitudinally divided into a first light adjusting region, a second light adjusting region and a third light adjusting region, and the first light adjusting region, the second light adjusting region and the third light adjusting region each have a plurality of focusing regions therein; in any one of the first light adjusting region, the second light adjusting region and the third light adjusting region, a plurality of focusing regions are sequentially arranged along the transverse direction; wherein, the longitudinal direction, the transverse direction and the first direction are mutually vertical;

in the focusing area which is transversely positioned in the middle of the first dimming area, at least one sheet-shaped lens is a reference lens, and the light-emitting surface of the reference lens is perpendicular to the first direction and is just opposite to the photosensitive surface of the sensing element.

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