CN211502650U - Diffuser, emission module and electronic equipment - Google Patents
Diffuser, emission module and electronic equipment Download PDFInfo
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- CN211502650U CN211502650U CN202020169794.5U CN202020169794U CN211502650U CN 211502650 U CN211502650 U CN 211502650U CN 202020169794 U CN202020169794 U CN 202020169794U CN 211502650 U CN211502650 U CN 211502650U
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Abstract
The utility model relates to a diffuser, transmission module and electronic equipment. The diffuser includes the base member and locates two kinds to eight kinds of diffusion units that the base member was same one side, the quantity of different kinds of diffusion units is a plurality ofly respectively, the diffusion unit has the diffusion face that is used for realizing the diffusion effect, the diffusion face of same kind of diffusion unit has the coplanar type, the diffusion face of different kinds of diffusion unit has the coplanar type, locate the unordered arrangement of diffusion unit that the base member was same one side, the emergent light that has expected light field distribution can be formed to the light of inciding to the diffuser after each diffusion face is adjusted. The diffuser is provided with a few types of diffusing surfaces, so that the influence of the whole processing deviation of the element on the actual light effect can be reflected only by detecting a few types of diffusing surfaces in the actual detection; the diffraction effect of final emergent light can be effectively inhibited by disordered arrangement of the diffusion surfaces, the problem of light spot ripple caused by the original periodic structure is effectively eliminated, and the actual light effect is improved.
Description
Technical Field
The utility model relates to the field of lighting, especially, relate to a diffuser, transmission module and electronic equipment.
Background
Engineered diffusers are a class of micro-optical elements that transform an input beam into a specific output beam, primarily for generating a specific required spot shape and energy distribution.
The existing engineering diffuser in the market at present is mainly formed by splicing randomly generated surface types, although the scheme can inhibit the diffraction effect to realize a better optical effect, the random surface type is adopted, so that the diffuser is difficult to effectively detect in actual processing, and the influence of the deviation of the actually processed surface type on the actual light effect cannot be reflected.
The other design scheme is that array micro-lenses with the same surface type are spliced, and although the problem that the actual surface type is difficult to measure can be solved by the implementation mode, a strong diffraction effect can be generated, so that the light effect of actual emergent light is poor.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a diffuser, an emission module and an electronic device for conveniently detecting the actual processing surface type and having an excellent light effect.
The utility model provides a diffuser, includes the base member and locates two kinds to eight kinds of diffusion units with one side of base member, different kind the quantity of diffusion unit is a plurality ofly respectively, diffusion unit has the diffusion face that is used for realizing the diffusion effect, same kind the diffusion unit the diffusion face has the same face type, and different kind the diffusion unit the diffusion face has different face types, locates the base member is with one side the diffusion unit is unordered arranges, incides to the emergent light that the light of diffuser can form after each diffusion face is adjusted and has expected light field distribution.
The diffuser is provided with the diffusing surfaces of a few types of surface types, so that only each different type of surface type in the diffuser needs to be measured in actual detection, namely only a few types of surface types need to be detected, the influence of the whole processing deviation of the element on the actual light effect can be reflected, and the detection complexity is greatly reduced; meanwhile, the diffusion surfaces are arranged in a disordered manner, namely the diffusion surfaces of the same type and different types are arranged in a disordered manner, so that the diffraction effect of final emergent light can be effectively inhibited, the problem of light spot ripple caused by the original periodic structure is effectively eliminated, and the actual light effect is improved.
In one embodiment, the diffusing units located on the same side of the substrate are arranged in an array. The design of array arrangement is beneficial to the processing and molding of the diffusion unit.
In one embodiment, the diffuser comprises three, four, five, six, seven or eight of the diffusing elements. The diffusion surfaces with different surface types are arranged between the diffusion units of different types, so that the influence of the whole processing deviation of the element on the actual light effect can be reflected only by measuring each different type of surface type in the diffuser during actual detection, namely only by detecting a few surface types, and the detection complexity is greatly reduced.
In one embodiment, the diffusing surface of at least one of the diffusing units has a rectangular, triangular, hexagonal or circular border. The design of the boundaries of different shapes will affect the surface shape of the diffusing surface, by which the shape of the light field distribution that can be formed by the incident light after passing through the diffusing surface can be controlled.
In one embodiment, the diffusing surface of at least one of the diffusing units is a curved surface. The light field distribution which can be formed after the incident light passes through the diffusion surface can be controlled through the design.
In one embodiment, the diffuser includes two types of diffusing elements. Only two surface types need to be detected, the influence of the whole processing deviation of the element on the actual light effect can be reflected, and therefore the detection complexity is greatly reduced.
In one embodiment, one of the diffusion units is used for controlling the optical field distribution of the emergent light in a first direction, and the other diffusion unit is used for controlling the optical field distribution of the emergent light in a second direction, wherein the first direction is perpendicular to the second direction. Through the design, the incident light can emit the emergent light which is formed in the two directions and has expected light field distribution after irradiating the diffuser. In addition, for the diffuser, the influence of the processing deviation of the whole element on the actual light effect can be reflected only by detecting the two surface types, so that the detection complexity is greatly reduced.
In one embodiment, the number of the diffusion units for controlling the light field distribution of the emergent light in the first direction is n1, the number of the diffusion units for controlling the light field distribution of the emergent light in the second direction is n2, and the ratio of n1 to n2 is in the range of 2: 3-3: 2. By controlling the quantity ratio of the two diffusion units, the light field distribution of emergent light can be further controlled.
In one embodiment, the number of different kinds of said diffusing elements is different. By controlling the number ratio of the different kinds of the diffusion units, the light field distribution of the emergent light can be further controlled.
In one embodiment, the other side of the substrate opposite to the side where the diffusion surface is located is a plane. The diffusion surface is arranged on the same side of the diffuser, and the other side surface opposite to the diffusion surface is arranged to be a plane, so that the processing flow can be simplified, and the preparation cost can be reduced.
In one embodiment, the diffusing surfaces of a plurality of the diffusing units of the same type are convex surfaces, and the vertexes of the convex surfaces are in different planes; and/or
The diffusion surfaces of the diffusion units of the same type are concave surfaces, and the lowest points of the concave surfaces are in different planes. The light field distribution of the emergent light can be controlled by controlling the surface type of the diffusion surface and the quantity proportion of the different types of diffusion units, and the light field distribution of the emergent light can also be controlled by generating the section difference of each diffusion unit, so that the diversity of the diffuser on the light field distribution control mode is increased, the disorder of the arrangement of the diffusion units is further increased, and the diffraction intensity is weakened.
A transmitting module comprises a light source and the diffuser, wherein the light source is used for irradiating the diffuser, and emergent light with expected light field distribution can be formed after light of the light source is shaped by the diffuser. By adopting the diffuser, when the light emitted by the light source irradiates the diffuser along a predetermined direction, the light emitted by the diffuser presents a desired light field distribution, namely, light spots with desired shapes and energy distributions can be obtained. In addition, the diffuser can effectively restrain the light spot ripple of emergent light, so that the emission module can finally generate emergent light spots with excellent light effect.
In one embodiment, the light of the light source is shaped by the diffuser to form emergent light with relatively uniform energy distribution. Through adopting above-mentioned diffuser, the emission module can form the good emergent light that has the energy and evenly distributes relatively to be favorable to using in the equipment that has higher requirement to the light source homogeneity.
An electronic device comprises a receiving module and the transmitting module, wherein the receiving module is used for receiving light rays which are irradiated to an identified object by the transmitting module and reflected by the identified object. Because above-mentioned emission module can produce the emergent light that has good anticipated light efficiency, consequently when adopting above-mentioned emission module, can promote electronic equipment's identification accuracy.
Drawings
FIG. 1 is a schematic view of a partial structure of a diffuser provided in an embodiment of the present application;
FIG. 2 is a schematic view of a partial structure of a diffuser provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of a partial structure of a diffuser provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of the arrangement of two diffusing elements in a diffuser provided in an embodiment of the present application;
FIG. 5 is a graph of the light effect produced by a diffusing element in the embodiment of FIG. 4;
FIG. 6 is a graph of the light effect produced by another diffusion unit in the implementation of FIG. 4;
FIG. 7 is a graph of the light effect of the two diffusion units in the embodiment of FIG. 4;
FIG. 8 is a diagram of light effects of two types of diffusion units arranged in a quantity ratio according to an embodiment of the present application;
FIG. 9 is a graph of irradiance versus coordinate in the X direction for the luminous efficacy plot of FIG. 8;
FIG. 10 is a graph of irradiance versus coordinate in the Y direction for the luminous efficacy plot of FIG. 8;
FIG. 11 is a diagram of light effects of two kinds of diffusion units in another quantity ratio according to an embodiment of the present application;
FIG. 12 is a graph of irradiance versus coordinate in the X direction for the luminous efficacy plot of FIG. 11;
FIG. 13 is a graph of irradiance versus coordinate in the Y direction for the luminous efficacy plot of FIG. 11;
FIG. 14 is a diagram of light effects of two kinds of diffusion units in another quantity ratio according to an embodiment of the present application;
FIG. 15 is a graph of irradiance versus coordinate in the X direction for the luminous efficacy plot of FIG. 14;
FIG. 16 is a graph of irradiance versus coordinate in the Y direction for the luminous efficacy plot of FIG. 14;
fig. 17 is a schematic diagram of a transmitting module according to an embodiment of the present application;
fig. 18 is a schematic view of an electronic device according to an embodiment of the present application.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Engineered diffusers are a class of micro-optical elements that transform an input beam into a specific output beam, primarily for generating a specific required spot shape and energy distribution. The existing engineering diffuser in the market at present is mainly formed by splicing randomly generated surface types, although the scheme can inhibit the diffraction effect to realize a better optical effect, the random surface types are adopted, so that the diffuser is difficult to effectively detect in actual processing, namely the surface types of various diffusion surfaces are difficult to detect one by one, and the influence of the deviation of the actually processed surface types on the actual light effect cannot be reflected. The other design scheme is that array micro-lenses with the same surface type are spliced, and although the problem that the actual surface type is difficult to measure can be solved by the implementation mode, a strong diffraction effect can be generated, so that the light effect of actual emergent light is poor. To this end, some embodiments of the present application provide a diffuser to solve the above-described problems.
Referring to fig. 1, 2 and 3, in some embodiments of the present application, the diffuser 10 has a plate-like structure, which may be a disk-like structure, a rectangular plate-like structure, a hexagonal plate-like structure, or the like. The diffuser 10 comprises a base 110 and two diffusing units 122, namely a first unit 121 and a second unit 122, arranged on the same side of the base 110. Each diffusion unit 122 has a diffusion surface 102 for achieving diffusion, the diffusion surfaces 102 of the same kind of diffusion unit 122 have the same surface type, and the diffusion surfaces 102 of different kinds of diffusion units 122 have different surface types. Specifically, each of the diffusion surfaces 102 in this embodiment is a curved surface, but the curvature of different kinds of diffusion surfaces 102 is different. The number of each diffusing unit 122 in the diffuser 10 is plural, i.e. the number of the first units 121 and the second units 122 is plural, for example, more than 100. The diffusing units 122 on the same side of the substrate 110 are arranged in an array, and the diffusers 10 are integrally connected, or it is understood that the entire diffuser 10 has an integral structure, and the diffusing surfaces 102 are on the same side of the diffuser 10, and the other surface of the diffuser 10 opposite to the side is a plane. In addition, the diffusing elements 122 in the diffuser 10 are arranged in a disordered manner (see fig. 4, in which the first elements 121 are denoted by a and the second elements 122 are denoted by B), in addition to being arranged in an array, i.e., the surface patterns of the diffusing surfaces 102 on the diffuser 10 are not arranged in a periodic manner, e.g., the diffuser 10 does not have a combined surface pattern structure of two identical sets of 3 × 3 or 4 × 4 arrays, and does not have more than 10 identical sets of 2 × 2 arrays. In some embodiments, the specific disorder form is not limited to the above-mentioned rule, as long as the arrangement of the diffusion units 120 can be disturbed to avoid the periodic arrangement of the diffusion surfaces 102 on the same side of the substrate 110.
It should be noted that the same surface type described in the embodiments may have a slight difference in the structural shape due to a processing error, and the same type of diffusion surface 102 having a slight deviation in the surface type due to an unintended reason such as a processing error should be regarded as having the same surface type. Fig. 3 shows the distribution of the array of the diffusion units 122 with two surface types, wherein the darker the color represents the greater the rise of the corresponding diffusion surface 102 in the region, and the diffusion unit 122 with the long axis of the elliptical shape facing the second direction Y is the first unit 121, and the diffusion unit 122 with the long axis of the elliptical shape facing the first direction X is the second unit 122.
In this embodiment, the diffuser 10 is made of a material having a high transmittance, for example, a transmittance of more than 90%, to incident light. The side of each diffusion surface 102 is the light-emitting side of the diffuser 10, and the other side opposite to the side is the light-entering side of the diffuser 10, which can also be regarded as the other side of the substrate 110 opposite to the side provided with the diffusion units 120. Incident light can enter the diffuser 10 from the light-entering side and subsequently exit through the diffusing surface 102. I.e. the incident light at this time can form the desired outgoing light by means of the transmissive diffuser 10. Since the curved surface shape of each diffusion surface 102 can refract light passing through the surface, the direction of refraction of light incident from a specific direction can be controlled by controlling the curvature of the surface shape of the diffusion surface 102 of a different type.
Taking the example that the incident light is parallel light and can completely cover the diffuser 10, after the incident light enters the diffuser 10, the incident light will be irradiated to each diffusion surface 102 from the inside of the diffuser 10, the incident light irradiated to each diffusion surface 102 will be refracted by the diffusion surface 102, and the light field distribution of the refracted light (outgoing light) will be different according to the surface type of the diffusion surface 102. In the above embodiment, the diffusion surface 102 of the first unit 121 can control the light field distribution of the refracted light in the first direction X, the diffusion surface 102 of the second unit 122 can control the light field distribution of the refracted light in the second direction Y, the first direction X and the second direction Y are perpendicular to each other, and the surface (plane in this embodiment) of the diffuser 10 on the light incident side is parallel to both the first direction X and the second direction Y. Referring to fig. 5 in particular, when the incident light is irradiated from the inside of the diffuser 10 to the diffusing surface 102 of the first unit 121, at an exit distance, the refracted light forms two relatively prominent and parallel strip-shaped light spots arranged at intervals in the first direction X while being diffused, and a relatively weak light field distribution exists between the two strip-shaped light spots. The light field distribution of fig. 5 is a superposition of all the refracted light formed by the first cells 121. Referring next to fig. 6, when the incident light is irradiated from the inside of the diffuser 10 to the diffusing surface 102 of the second unit 122, at an emergent distance, the refracted light forms two relatively prominent and parallel strip-shaped light spots arranged at intervals in the second direction Y while being diffused, and a relatively weak light field distribution exists between the two strip-shaped light spots. The light field distribution of fig. 6 is a superposition of all the refracted light formed by the second cells 122.
It should be noted that the light spots in the embodiment of the present application are not limited to the light spots with concentrated energy and circular shape, the light fields with emergent light in triangular, rectangular, hexagonal or irregular shape may also be referred to as light spots, the light fields with distributed energy not concentrated at one position may also be referred to as light spots, and the rectangular light fields distributed in the manner of fig. 5 and 6 may also be referred to as light spots.
Referring to fig. 5, 6 and 7 together, since the incident light irradiates the diffusing surface 102 of each diffusing unit 122 and then exits and diffuses, at this time, the light field of the refracted light adjusted by each diffusing surface 102 will overlap in a large area at a desired distance from the light exit side of the diffuser 10, that is, the light fields distributed in the form of fig. 5 and 6 will overlap, and the two strip-shaped light spots arranged along the first direction X overlap with the two strip-shaped light spots arranged along the second direction Y and the light field between the strip-shaped light spots, so as to form the approximately rectangular light field distribution in fig. 7 as a whole. And because the four strip-shaped light spots with higher intensity are not superposed with each other, and light fields with weaker intensity among the original strip-shaped light spots are superposed, the intensity of the four sides of the light field is only slightly higher in the rectangular light field formed finally, but the intensity in the whole light field distribution area tends to be average. The diffuser 10 in this embodiment is thus capable of shaping incoming light into outgoing light having a rectangular shape and a relatively uniform energy distribution.
Specifically, each diffusing surface 102 in the embodiments of the present application may be formed on the diffuser 10 body by means of stamping, for example, by means of thermoforming, and the plurality of diffusing surfaces 102 may be stamped on the surface by means of a suitable mold or fixture under the condition that the diffuser 10 body is softened by heating and by gas pressure, liquid pressure or mechanical pressure. Alternatively, an optical paste may be disposed on one surface of one substrate, and the diffusion surface 102 having a desired surface shape may be formed by die-stamping the optical paste and curing the optical paste. The actual method of manufacturing the diffusion surface 102 is not limited to the above description. In some embodiments, the diffuser 10 is made of any one of glass, plastic, and optical cement.
Whether the diffusing surfaces 102 are embossed by integral molding or by providing optical glue, they ultimately allow the diffuser 10 to be structurally divided into a base 110 and diffusing elements 120 on one side of the base 110. Wherein, for the solution of integral stamping, each diffusion unit 120 and the substrate 110 actually belong to an integral structure (refer to fig. 1 and 2). For the scheme of disposing the optical cement on the substrate, the substrate may be regarded as the base 110, and the embossed optical cement forms the diffusion units 120, and at this time, a distinguishable interface exists between the base 110 and the diffusion units 120, and the base 110 and the diffusion units 120 may be made of different materials.
The diffuser 10 in the above embodiment obtains the emergent light with the expected light field distribution by only arranging the diffusing surfaces 102 with two surface types, so that the influence of the processing deviation of the whole element on the actual light effect can be reflected only by measuring the parameters of the two surface types on the diffuser 10 in the actual detection, and the complexity of the detection is greatly reduced, for example, when the light field distribution does not meet the requirement, the parameters of the two surface types can be directly adjusted to rework and correct; meanwhile, the diffusion surfaces 102 are arranged in a disordered manner, so that the diffraction effect of final emergent light can be effectively inhibited, the problem of light spot ripple caused by the original periodic structure is effectively eliminated, and the actual light effect is improved.
In the description of the present application, the expected light field distribution is understood to include an expected light field shape and an expected energy distribution.
In some embodiments, the surface type of each diffusing surface 102 is spherical, and the spherical surface types of different kinds of diffusing surfaces 102 differ in curvature. In other embodiments, the surface type of each diffusing surface 102 is aspheric, and the aspheric formula can refer to the following formula:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, X is the distance from the corresponding point on the aspheric surface to the optical axis of the surface in the first direction X, cxIs aspheric surface with vertex atCurvature in a first direction X, kxIs the conic coefficient of the aspheric surface in the first direction X, Y is the distance from the corresponding point on the aspheric surface to the optical axis of the surface in the second direction Y, cyIs the curvature of the aspheric apex in the second direction Y, kyIs the conic coefficient of the aspheric surface in the second direction Y.
Specifically, in one embodiment, the diffusing surfaces 102 of the first and second units 121 and 122 are both aspheric. Wherein the aspheric coefficients of the diffusing surface 102 of the first unit 121 are: k is a radical ofy＝0.012523196018，cyIs-1.143339662616, kxIs 0.020047080628, cxIs-0.712384362848; the aspheric coefficients of the diffusing surface 102 of the second unit 122 are: k is a radical ofy＝0.020015122627，cyIs-0.986778763145, kxIs 0.009741728096, cxIs-0.994831801896.
Besides two surface types, in some embodiments, three, four, five, six, seven or eight kinds of diffusion units 122 may be disposed on the diffuser 10, the surface types of the different kinds of diffusion units 122 are different, but the surface types of the same kind of diffusion units 122 are the same, so that only by detecting the parameters of the above few kinds of surface types, the influence of the processing deviation of the whole element on the actual light efficiency can be reflected, and the complexity of the detection is greatly reduced.
It should be noted that, in some embodiments, the surface type parameter of a certain diffusion surface 102 in the first direction X is the same as the surface type parameter of another diffusion surface 102 in the second direction Y, and the surface type parameter of the diffusion surface 102 in the second direction Y is the same as the surface type parameter of the another diffusion surface 102 in the first direction X, that is, the two diffusion surfaces 102 can actually overlap with each other only by rotating 90 °, but the surface types of the two diffusion surfaces 102 are still defined as different surface types in the embodiments of the present application. For example, k of a certain diffusion surface 102yK with another diffusing surface 102xSimilarly, k of the diffusion surface 102xK with the other diffusing surface 102yLikewise, c of the diffusing surface 102xC with the other diffusing surface 102yLikewise, c of the diffusing surface 102xAnd the otherC of a diffusing surface 102yThe same is true.
In some embodiments, at least one of the diffusing surfaces 102 on the diffuser 10 is curved. In other embodiments, the diffusion surface 102 may be a curved surface or a combination of sub-planes, for example, three sub-planes are obliquely combined to form the diffusion surface 102, so that the diffusion unit 122 has a triangular prism structure.
In some embodiments, the diffuser 10 has a plate-like structure, the plate-like structure of the diffuser 10 being parallel or approximately parallel to the first direction X and the second direction Y, and additionally a third direction being perpendicular to the first direction X and the second direction Y, i.e. the third direction being perpendicular or approximately perpendicular to the diffuser 10 in the plate-like structure. The region near the vertex of the adjusting surface (which can be understood as a point where the slope changes of the surface in the first direction X and the second direction Y are zero) is perpendicular to the third direction, and when the projection of a certain adjusting surface in the third direction is in a rectangular shape (the projection shape actually depends on the boundary shape of the adjusting surface), the light field distribution formed after the incident light is refracted by the adjusting surface is also in a substantially rectangular shape; and when the boundary of the adjusting surface is triangular, circular or polygonal, the light field distribution of the emergent light of the adjusting surface is approximately triangular, circular or polygonal finally. In some embodiments, the boundary shape of at least one of the diffusing surfaces 102 may be any one of a rectangle, a triangle, a hexagon, a circle, etc., and the array of surface shapes on the diffuser 10 may be any one or a combination of the above shapes, and the surface shapes are configured such that the light field distribution of the outgoing light can be controlled to obtain the outgoing light with a desired light field distribution (e.g., a desired shape and a desired energy distribution).
Besides controlling the type of the adjusting surface of the diffusion unit 122 and the surface matching to obtain the emergent light field distribution with the expected shape, the energy distribution of the emergent light can be controlled by controlling the quantity proportional relation of different types of surface. Thus, in some embodiments, the number of different types of diffusing units 122 may be the same or different. For example, in some embodiments, for the diffuser 10 having two kinds of diffusion units 122 (the first unit 121 and the second unit 122), the number ratio of the first unit 121 to the second unit 122 is in a range of 2:3 to 3: 2.
Specifically, referring to fig. 8, 9 and 10, in some embodiments, the number ratio of the first units 121 to the second units 122 is 1:1, at this time, the light field distribution of the outgoing light shaped by the diffuser 10 is as shown in fig. 8, the energy distribution of the light field in the first direction X is as shown in fig. 9, and the energy distribution of the light field in the second direction Y is as shown in fig. 10, that is, the shape of the light spot of the outgoing light at this time is rectangular as a whole, and the energy distribution of the light spot is relatively uniform.
In some embodiments, the ratio of the number of the first units 121 to the number of the second units 122 is 2:3, where the light field distribution of the outgoing light after the incident light is shaped by the diffuser 10 is as shown in fig. 11, the energy distribution of the light field in the first direction X is as shown in fig. 12, and the energy distribution of the light field in the second direction Y is as shown in fig. 13, that is, the shape of the light spot of the outgoing light is rectangular as a whole, and the energy distribution of the light spot is relatively uniform.
In some embodiments, the ratio of the number of the first units 121 to the number of the second units 122 is 3:2, where the light field distribution of the outgoing light shaped by the diffuser 10 is as shown in fig. 14, the energy distribution of the light field in the first direction X is as shown in fig. 15, and the energy distribution of the light field in the second direction Y is as shown in fig. 16, that is, the shape of the light spot of the outgoing light is rectangular as a whole, and the energy distribution of the light spot is relatively uniform.
According to the proportional relationship between each energy distribution diagram (irradiance-coordinate relation diagram) and the different kinds of diffusion units 122, the light field energy distribution of the final emergent light can be controlled by controlling the number proportion of the different kinds of diffusion units 122, so that the emergent light with expected energy distribution can be obtained by reasonably designing the proportions of the different kinds of diffusion units 122, for example, emergent light spots with uniform or relatively uniform energy distribution can be obtained. The relatively uniform distribution may be referenced to the energy distribution maps, for example, where the light field is rectangular, the intensity in the central region of the light field is greater than 5/7 which is the maximum intensity in the light field.
In addition to controlling the ratio of the number of two diffusing units 122 in the two-facet embodiment, the ratio of the number of each type of diffusing unit 122 may also be controlled in the three-, four-, or more-facet embodiment to achieve a desired light field. In some embodiments, the number of different kinds of diffusion units 122 is different, and by controlling the ratio of the number of different kinds of diffusion units 122, the light field distribution of the outgoing light can be further controlled.
In addition to controlling the light field of the outgoing light in the above-described manners, in some embodiments, the light field quality of the outgoing light may also be improved by adjusting the position of the diffusion unit 122 in the third direction. For example, in some embodiments, the diffusing surfaces 102 are located on the same side of the diffuser 10, and the diffusing units 122 have a step difference on the side, i.e., the diffusing units 122 have a step difference in arrangement structure, it can also be understood that the boundary of the adjacent diffusing surfaces 102 has a fault structure. At this time, the step structure can also control the light field distribution of the emergent light, thereby increasing the diversity of the diffuser 10 in the light field distribution control manner, and further increasing the disorder of the arrangement of the diffusion unit 122 in the three-dimensional space, so as to reduce the diffraction effect. Specifically, in some embodiments, the diffusion units 122 have an integral connection structure therebetween, the diffusion units 122 are arranged in an array, and the boundary of the diffusion surface 102 of each diffusion unit 122 is rectangular or approximately rectangular, so that the diffusion units 122 can be regarded as being spliced together on a plane, each diffusion unit 122 is adjacent to one diffusion unit 122 on four sides of the rectangular boundary, that is, one boundary of each diffusion unit 122 is adjacent to one boundary of another diffusion unit 122, in these embodiments, there is a height difference between any two adjacent corresponding boundaries to form a cross-sectional structure, that is, a step difference, so as to further effectively avoid that each diffusion unit 122 forms a periodic structure, so that the light field distribution formed by each diffusion unit 122 has a slight deviation, and thus the light fields are not easy to interfere when being superimposed, so as to reduce the generation of ripples, and the quality of the light spot is improved. It is noted that the above description is mainly directed to the diffusing units 122 in non-edge positions, and the diffusing units 122 at the edges of the diffuser 10 cannot actually be adjacent to one diffusing unit 122 all around. In other embodiments, only 50%, 60%, 70%, 80% or 90% of the diffusing units 122 in the diffuser 10 are stepped from adjacent diffusing units 122.
In some embodiments, the diffusing surfaces 102 of the diffusing units 120 are convex surfaces, the diffusing surfaces 102 have the same surface type, and the vertices of the diffusing surfaces 102 are in different planes. Reference is made to fig. 2, which also means that some of the above-mentioned vertices are in one plane parallel to the lower surface of the diffuser 10 and other vertices are in another plane parallel to the lower surface of the diffuser 10 (the two dashed lines in fig. 2 represent two virtual planes). In other embodiments, the diffusing surfaces 102 may also be concave surfaces, with the lowest points of the concave surfaces being in different planes. Therefore, the above arrangement can generate a height difference between the diffusion units 120 of the same kind, thereby increasing the disorder of the arrangement of the diffusion units 122 in the three-dimensional space and achieving the effect of reducing the diffraction effect. In the description of the present application, the diffusing surfaces 102 with different surface types may be all convex surfaces or all concave surfaces, and the difference in surface types may refer to that the curvature radii of the surfaces are different in size, but the positive and negative of the curvature radii are the same.
Referring back to fig. 2, in some embodiments, a surface of the diffuser 10 on the light incident side (i.e., a lower surface of the diffuser 10 in fig. 2) may also be formed with a plurality of diffusing surfaces 102 by stamping or the like, each diffusing surface 102 on the light incident side corresponds to one diffusing surface 102 on the light emergent side in the third direction, and two diffusing surfaces 102 corresponding to each other in the third direction are respectively used as the light incident surface and the light emergent surface of one diffusing unit 122, where the diffusing surface 102 on the light incident side is the light incident surface, and the diffusing surface 102 on the light emergent side is the light emergent surface. The structural shape and the arrangement of the diffusion surface 102 on the light incident side of each diffusion unit 122 can refer to the arrangement scheme of the diffusion surface 102 on the light emergent side in the above embodiments, which is not described herein again.
In other embodiments, the diffuser 10 is provided with a reflective layer on the surface of the side provided with the diffusing units 120, the reflective layer covers each diffusing surface 102, and the reflective layer covering each diffusing surface 102 can be patterned to form a surface shape of the corresponding diffusing surface 102, where the light incident side and the light exiting side of the diffuser 10 are both on the same side, that is, the reflective layer is located on both the light incident side and the light exiting side. The reflective layer in some embodiments is a metal plating, alloy plating, or the like having high reflectivity. In the present application, a reflectance greater than 80% may be referred to as a high reflectance. Incident light strikes the reflective layer from the exterior of the diffuser 10 and is reflected by the reflective layer to form outgoing light having a desired light field distribution.
Above, the above-mentioned structural design of diffuser 10 not only makes things convenient for the detection of actual machined surface type, can also make the emergent light have good light efficiency effect simultaneously.
Referring to fig. 17, some embodiments of the present application further provide an emission module 20, where the emission module 20 includes a light source 210 and a diffuser 10, the light source 210 is disposed in a direction of a light incident side of the diffuser 10, the light source 210 is used for irradiating the diffuser 10, and light emitted by the light source 210 is shaped by the diffuser 10 to form emergent light with a desired light field distribution. The light source 210 in some embodiments is a laser light source. In some embodiments, by controlling the surface type, number ratio, disordered arrangement, step structure, and the like of each diffusion surface 102 on the diffuser 10, the incident light can form an emergent light spot with uniformly distributed energy after being adjusted by the diffuser 10, that is, the emission module 20 at this Time can be applied to a device that needs to use or generate a uniform light spot, for example, a device that uses TOF (Time of flight) identification. Because the diffuser 10 can effectively suppress the spot ripple of the emergent light, the emission module 20 can finally generate the emergent light spot with excellent light effect.
Referring to fig. 18, the present application further provides an electronic device 30, where the electronic device 30 may specifically be a device adopting 3D structured light recognition or a device adopting TOF recognition, the electronic device 30 may specifically be a smart phone, a smart watch, a tablet computer, a vehicle-mounted recognition device, an electronic reader, and the like, and the electronic device 30 may also be applied to the smart home field. The electronic device 30 includes a receiving module 310 and a transmitting module 20, wherein the receiving module 310 is used for receiving the light emitted to the identified object by the transmitting module 20 and reflected by the identified object, so as to obtain the surface profile information of the identified object. Since the emission module 20 can generate the emergent light with excellent luminous efficiency, when the emission module 20 is adopted, the identification precision of the electronic device 30 can be improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The diffuser is characterized by comprising a base body and two to eight kinds of diffusion units arranged on the same side of the base body, wherein the number of the diffusion units is different, the diffusion units are respectively multiple, each diffusion unit is provided with a diffusion surface for realizing diffusion, the diffusion surfaces of the diffusion units are of the same surface type, the diffusion surfaces of the diffusion units are of different surface types, the diffusion units are arranged on the same side of the base body in a disordered way, and emergent light with expected light field distribution can be formed after light rays incident to the diffuser are adjusted through the diffusion surfaces.
2. The diffuser of claim 1, wherein each of the diffusing elements on a same side of the substrate are arranged in an array.
3. The diffuser of claim 1, wherein the diffusing surface of at least one of the diffusing elements has rectangular, triangular, hexagonal, or circular boundaries.
4. The diffuser of claim 1, comprising two diffusing elements.
5. The diffuser of claim 4, wherein one of the diffusing elements is configured to control a light field distribution of the emitted light in a first direction, and the other of the diffusing elements is configured to control a light field distribution of the emitted light in a second direction, the first direction being perpendicular to the second direction.
6. The diffuser of claim 5, wherein the number of diffusing elements used to control the distribution of the optical field of the exiting light in the first direction is n1, the number of diffusing elements used to control the distribution of the optical field of the exiting light in the second direction is n2, and the ratio of n1 to n2 is in the range of 2:3 to 3: 2.
7. The diffuser of claim 1, wherein the number of diffusing elements of different kinds is different.
8. The diffuser of claim 1, wherein the diffusing surfaces of a plurality of the same type of diffusing elements are convex surfaces, and the vertices of the plurality of convex surfaces are in different planes; and/or
The diffusion surfaces of the diffusion units of the same type are concave surfaces, and the lowest points of the concave surfaces are in different planes.
9. An emission module, comprising a light source and the diffuser of any one of claims 1 to 8, wherein the light source is configured to illuminate the diffuser, and light from the light source is shaped by the diffuser to form outgoing light with a desired light field distribution.
10. An electronic device, comprising a receiving module and the emitting module of claim 9, wherein the receiving module is configured to receive the light emitted from the emitting module to an identified object and reflected by the identified object.
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| CN202020169794.5U CN211502650U (en) | 2020-02-14 | 2020-02-14 | Diffuser, emission module and electronic equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115016051A (en) * | 2022-06-24 | 2022-09-06 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
| TWI825390B (en) * | 2021-02-02 | 2023-12-11 | 達運精密工業股份有限公司 | Optical diffusing element and light-emitting assembly for three-dimension sensing |
| CN115016051B (en) * | 2022-06-24 | 2024-05-31 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
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2020
- 2020-02-14 CN CN202020169794.5U patent/CN211502650U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI825390B (en) * | 2021-02-02 | 2023-12-11 | 達運精密工業股份有限公司 | Optical diffusing element and light-emitting assembly for three-dimension sensing |
| CN115016051A (en) * | 2022-06-24 | 2022-09-06 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
| CN115016051B (en) * | 2022-06-24 | 2024-05-31 | 奥比中光科技集团股份有限公司 | Diffuser and design method thereof |
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