CN217823696U - Square facula laser module - Google Patents
Square facula laser module Download PDFInfo
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- CN217823696U CN217823696U CN202221959180.2U CN202221959180U CN217823696U CN 217823696 U CN217823696 U CN 217823696U CN 202221959180 U CN202221959180 U CN 202221959180U CN 217823696 U CN217823696 U CN 217823696U
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Abstract
The utility model discloses a square facula laser module. Square facula laser module includes: a laser chip and a light pattern adjusting lens; the laser chip comprises a plurality of light-emitting units, and the plurality of light-emitting units form a square light-emitting area; the plurality of light emitting units are used for emitting initial laser signals; the light pattern adjustment lens comprises a first light pattern adjustment surface and a second light pattern adjustment surface; the first light type adjusting surface and the second light type adjusting surface are both positioned on a propagation path of the initial laser signal and are used for adjusting the initial laser signal to form an adjusted laser signal; the first direction intersects the second direction; the first light pattern adjustment surface comprises a free-form surface; the second light pattern adjustment surface includes an exit plane. By adopting the technical scheme, the difficulty of spot shaping is reduced, the structure is simple, complex process technology is not required, the traditional injection molding and film pressing process is adopted, and the automatic production is facilitated.
Description
Technical Field
The utility model relates to the field of photoelectric technology, especially, relate to a square facula laser module.
Background
Lasers have wide applications in the fields of machine vision, 3D recognition, lidar, indoor navigation, and the like, and in order to match sensors (sensors) of a receiving end (RX) and improve energy utilization efficiency, a circular spot with a small divergence angle generally needs to be shaped into a square spot with a larger divergence angle.
At present, common beam expanding and shaping means include a high-power laser diffraction beam shaper (DOE) and an engineering scatterer (diffuser), the quality of a light spot obtained by the DOE is poor, and the structure of the engineering scatterer is complex and the price is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a square facula laser module to solve the current complicated, the with high costs problem of structural design of square facula laser module.
According to the utility model discloses an aspect provides a square facula laser module, square facula laser module includes: a laser chip and a light shape adjusting lens;
the laser chip comprises a plurality of light-emitting units, and the light-emitting units form a square light-emitting area; the plurality of light-emitting units are used for emitting initial laser signals;
the light pattern adjustment lens comprises a first light pattern adjustment surface and a second light pattern adjustment surface; the first light type adjusting surface and the second light type adjusting surface are both located on a propagation path of the initial laser signal, and the first light type adjusting surface and the second light type adjusting surface are used for adjusting the initial laser signal to form an adjusted laser signal; in a first direction, the extension length of the adjusted laser signal is greater than the extension length of the initial laser signal; in a second direction, the extension length of the adjusted laser signal is greater than the extension length of the initial laser signal; the first direction intersects the second direction;
the first light pattern adjustment surface comprises a free-form surface; the second light pattern adjustment surface includes an exit plane.
Optionally, the refractive index of the light shape adjusting lens is greater than the refractive index of the transmission environment of the initial laser signal and the refractive index of the transmission environment of the adjusted laser signal.
Optionally, a value range of a distance d1 between the center of the first light type adjustment surface and the center of the second light type adjustment surface is 0.5mm or more and d1 or less and 1mm or less.
Optionally, the size of the outline of the square light emitting area along the first direction is L; the size of the outline of the square light emitting area along the second direction is W; wherein W is less than L;
the distance between the center of the first light type adjusting surface and the center of the laser chip is d2; wherein, d2 is more than or equal to L and less than or equal to 2L.
Optionally, the light pattern adjusting lens is of a central symmetrical structure.
Optionally, the surface type of the free-form surface satisfies:
wherein x is a coordinate value in a first direction, y is a coordinate value in a second direction, and z is a coordinate value in a third direction, and the third direction is perpendicular to both the first direction and the second direction; c is the radius of curvature; k is a conic constant;
A. b, C, D, E and F are the constant coefficients of the free form surface, respectively.
Optionally, the value range of the conic constant k is-2 or more and k is-1 or less.
Optionally, the square spot laser module further includes: a substrate; the backlight surface of the laser chip is fixed on one side of the substrate; the substrate is electrically connected with the laser chip through a bonding pad.
The utility model discloses technical scheme has reduced the degree of difficulty of facula plastic, and simple structure need not to use complicated technology, uses traditional moulding plastics and press mold technology can, is favorable to automated production.
It should be understood that the statements herein are not intended to identify key or critical features of any embodiment of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will be readily apparent from the following specification.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without creative efforts.
Fig. 1 is a schematic front view of a square spot laser module according to an embodiment of the present invention;
fig. 2 is a schematic side view of a square spot laser module according to an embodiment of the present invention;
fig. 3 is a schematic top view of a laser chip according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a light spot of an initial laser signal according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a light spot for adjusting a laser signal according to an embodiment of the present invention;
fig. 6 is a schematic top view of another laser chip according to the present invention;
fig. 7 is a schematic front view of another square spot laser module according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for determining parameters of a square spot laser module according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is the embodiment of the utility model provides a pair of square facula laser module's orthographic view structure schematic diagram, fig. 2 is the embodiment of the utility model provides a pair of square facula laser module looks sideways at the structure schematic diagram, fig. 3 is the utility model discloses the implementation provides a laser chip overlook the structure schematic diagram. Referring to fig. 1 to 3, a square spot laser module is characterized by including a laser chip 10 and a light shape adjusting lens 20. The laser chip 10 includes a plurality of light emitting cells 11, the plurality of light emitting cells 11 forming a square light emitting region 12; the plurality of light emitting units 11 are used to emit an initial laser signal 01.
1-3, the beam pattern adjustment lens 20 includes a first beam pattern adjustment surface 21 and a second beam pattern adjustment surface 22; the first light type adjusting surface 21 and the second light type adjusting surface 22 are both located on a propagation path of the initial laser signal 01, and the first light type adjusting surface 21 and the second light type adjusting surface 22 are used for adjusting the initial laser signal 01 to form an adjusting laser signal 02; along the first direction X, the extension length of the laser signal 02 is adjusted to be larger than that of the initial laser signal 01; along the second direction Y, the extension length of the adjusted laser signal 02 is greater than the extension length of the initial laser signal 01. The second direction Y intersects the first direction X, the third direction Z is a thickness direction of the light pattern adjusting lens 20, and the third direction Z intersects the first direction X and the second direction Y, respectively. For convenience of understanding, the embodiments of the present invention are described by taking two mutually perpendicular first direction X, second direction Y and third direction Z as examples.
Wherein, first light type adjustment face 21 includes free curved surface, and second light type adjustment face 22 includes the exit plane. The laser chip 10 refers to a micro light emitting chip, including but not limited to a VCSEL chip, wherein the VCSEL chip has advantages of high mass productivity and low cost, and is an ideal laser light source. The shape of the light emitting unit 11 may be a circle, a square, a triangle, etc., and preferably, the light emitting unit 11 is a circle.
Exemplarily, fig. 4 is a schematic diagram of a light spot of an initial laser signal provided by the embodiment of the present invention, and fig. 5 is a schematic diagram of a light spot of an adjustment laser signal provided by the embodiment of the present invention. Referring to fig. 1 to 5, the initial laser signals 01 emitted by the plurality of light emitting units 11 are small circular spots, as shown in fig. 4, after being shaped by the light shape adjusting lens 20, the initial laser signals 01 form an adjusted laser signal 02, and the adjusted laser signal 02 is a large square spot, as shown in fig. 5. The first light type adjustment surface 21 can shape the initial laser signal 01 into a transition laser signal 03, and the extension length of the transition laser signal 03 is greater than that of the initial laser signal 01 along the first direction X and the second direction Y; the second light type adjustment surface 22 can shape the transition laser signal 03 into the adjustment laser signal 02, and the extension length of the adjustment laser signal 02 is greater than that of the transition laser signal 03 along the first direction X and the second direction Y. After the initial laser signal 01 passes through the first light type adjustment surface 21, the initial laser signal is stretched along the first direction and the second direction respectively to form a transition laser signal 03; after passing through the second light pattern adjustment surface 22, the transition laser signal 03 is further stretched in the first direction and the second direction, respectively; the initial laser signal 01 can be shaped from a circular spot with a smaller divergence angle to a square spot with a larger divergence angle.
The embodiment of the utility model provides a square facula laser module has reduced the degree of difficulty of facula plastic, and simple structure need not to use complicated technology, use traditional mould plastics and press mold technology can, be favorable to automated production.
Optionally, the refractive index of the light shape adjusting lens 20 is greater than the refractive index of the transmission environment of the initial laser signal 01 and the refractive index of the transmission environment of the adjusted laser signal 02, that is, the refractive index of the transmission environment of the transition laser signal 03 is greater than the refractive index of the transmission environment of the initial laser signal 01 and the refractive index of the transmission environment of the adjusted laser signal 02.
Illustratively, with continued reference to FIGS. 1 and 2, the dashed lines in FIGS. 1 and 2 are the normal of a light ray passing through the first adjusting surface 21 and the normal of a light ray passing through the second adjusting surface 22, respectively. The incident angles alpha and delta of the initial laser signal 01 on the first light type adjustment surface 21 are respectively larger than the refraction angles beta and psi of the transition laser signal 03 on the first light type adjustment surface 21, the initial laser signal 01 is refracted through the first light type adjustment surface 21, the refracted light is the transition laser signal 03, and the transition laser signal 03 is stretched along the first direction X and the second direction Y respectively compared with the initial laser signal 01; transition laser signal 03 is less than adjustment laser signal 02 respectively at the angle of refraction theta and omega of second light type adjustment surface 22 at the angle of incidence gamma and the lambda of second light type adjustment surface 22, and transition laser signal 03 takes place the refraction through second light type adjustment surface 22, and the light after the refraction is adjustment laser signal 02, and adjustment laser signal 02 compares transition laser signal 03 and is followed first direction X and second direction Y respectively and stretched. Optionally, the light pattern adjusting lens includes a light-transmitting material such as silica gel, resin, or molded glass.
It should be understood that fig. 3 shows an arrangement of the light emitting units 11 of the laser chip 10 by way of example only, and the arrangement of the light emitting units 11 of the laser chip 10 may also be as shown in fig. 6.
Alternatively, referring to fig. 3 and 6, a value range of a size L of a contour of a square light emitting region 12 composed of a plurality of light emitting units 11 along a first direction X is L, and a size W of the contour of the square light emitting region 12 along a second direction Y is W; wherein W is less than L; the distance between the center of the first light pattern adjustment surface 21 and the center of the laser chip 10 is d2; wherein, d2 is more than or equal to L and less than or equal to 2L. The distance between the center of the first light type adjusting surface 21 and the center of the laser chip 10 is set to be d2, so that the shaping precision of the light type adjusting lens 20 on the initial laser signal 01 can be controlled, and the optical effect is improved.
Optionally, the beam pattern adjusting lens 20 is a central symmetrical structure. Illustratively, the first beam pattern adjusting surface 21 includes a first symmetric surface parallel to a plane formed by the first direction X and the third direction Z, and a second symmetric surface (not shown) parallel to a plane formed by the second direction Y and the third direction Z, and the beam pattern adjusting lens 20 intersects the center of the laser chip 10 as a central symmetric axis. In this way, the light shape adjusting lens 20 can stretch the initial laser signals 01 on both sides of the center of the laser chip 10 to the same degree, and stretch symmetrically, thereby improving the optical effect.
Optionally, the surface type of the free-form surface of the first light type adjustment surface 21 satisfies:
wherein x is a coordinate value in a first direction, y is a coordinate value in a second direction, z is a coordinate value in a third direction, and the third direction is perpendicular to both the first direction and the second direction; c is the radius of curvature; k is a conic constant;
A. b, C, D, E and F are each constant coefficients of a free form surface. In an optional embodiment, the value range of the conic constant k is-2 ≦ k ≦ -1. Setting different values of curvature radius c and/or different values of conic constant k to obtain different spot area regulating laser signals 02; setting one or more of constant coefficients A, B, C and D to obtain adjusted laser signals 02 with different spot length-width ratios; and setting constant coefficients E and/or constant coefficients F with different values to obtain square light spots with different fillet sizes. So, through reasonable setting curvature radius C, conic constant k, constant coefficient A, constant coefficient B, constant coefficient C, constant coefficient D, constant coefficient E and constant coefficient F, can control light type adjusting lens 20 to the tensile degree of initial laser signal 01 along first direction X and to the tensile degree of initial laser signal 01 along second direction Y, can realize the facula of various effects.
Optionally, with continued reference to fig. 1, a distance d1 between the center of the first light pattern adjustment surface 21 and the center of the second light pattern adjustment surface 22 may be in a range of 0.5mm or more and d1 or less and 1mm or less. Through the size of the interval d1 between the center of rationally setting up first light type adjustment surface 21 and the center of second light type adjustment surface 22, can control light type adjustment lens 20 to initial laser signal 01's plastic degree.
Optionally, fig. 7 is a schematic front view of another square spot laser module according to an embodiment of the present invention. Referring to fig. 7, the square spot laser module further includes a substrate 30, and a backlight surface of the laser chip 10 is fixed on one side of the substrate 30; the substrate 30 is electrically connected to the laser chip 10 via bonding pads (not shown).
Exemplarily, the light type adjusting lens 20 may have a structure as shown in fig. 7, the light type adjusting lens 20 and the substrate 30 may be fixed by using thermosetting glue or UV glue, the first light type adjusting surface 21 and the substrate 30 may form a cavity, and the cavity may be filled with air or other substances having light transmittance, such as glue. Glue can be glued with sealed form point, prevents that steam, oxygen etc. from getting into the cavity, reduces square facula laser module's reliability.
With continued reference to fig. 7, the bonding pad of the substrate 30 includes a lead hole 31 and a copper foil (not shown in the figure), the lead 13 of the laser chip 10 can be inserted into the lead hole 31, so as to electrically connect the substrate 30 and the laser chip 10, and the substrate 30 can provide an electrical signal for the laser chip 10 and also can dissipate heat for the square spot laser module. The bonding pads of the substrate 30 may be located on one side of the laser chip 10 along the first direction X, or on one side of the laser chip 10 along the second direction Y, so as to reduce the aspect ratio of the square spot laser module.
Fig. 8 is a flowchart of a method for determining parameters of a square spot laser module provided by the embodiment of the present invention, the method for determining parameters can be used to determine the embodiment of the present invention provides parameters of a square spot laser module. As shown in fig. 8, the method includes:
s110, determining first size information of an initial laser signal emitted by the laser chip.
Illustratively, the first dimension information includes a divergence angle of the initial laser signal in a first direction and a divergence angle of the initial laser signal in a second direction.
And S120, determining second size information of the required laser signal.
Illustratively, the desired laser signal includes a modified laser signal, and the second dimension information includes a divergence angle of the second modified laser signal in the first direction and a divergence angle of the second modified laser signal in the second direction.
And S130, determining parameters of the light shape adjusting lens according to the first size information and the second size information.
Illustratively, according to the first size information and the second size information, an appropriate beam shape adjusting lens may be selected so that the beam shape adjusting lens may shape the initial laser signal conforming to the first size information into an adjusted laser signal conforming to the second size information.
Optionally, determining parameters of the light pattern adjusting lens according to the first size information and the second size information includes: the refractive index of the light pattern adjustment lens and the surface type information of the first light pattern adjustment surface are determined based on the first size information and the second size information. Wherein the surface type information includes a surface type formula of the first light type adjustment surface.
Illustratively, according to the first size information and the second size information, a light pattern adjusting lens with a suitable refractive index may be selected, and for example, a light-transmitting material with a refractive index > 1.4, such as resin, plastic, or optical glass, may be selected. According to first size information and second size information, can also select the first light type adjustment surface and the second light type adjustment surface of suitable face type, for example want to further stretch along first direction with second adjustment laser signal, can select the light type adjustment lens the same but the coefficient is different with original second face type formula. In addition, light type adjusting lenses with different thicknesses or the distance between the first light type adjusting surface and the laser chip can be selected according to the first size information and the second size information.
The embodiment of the utility model provides a, according to first size information and second size information, can select suitable light type adjusting lens, reduce use cost.
The embodiment of the utility model provides a square facula laser module's parameter determination method can confirm the utility model discloses arbitrary embodiment provides square facula laser module's parameter possesses corresponding functional module of square facula laser module and beneficial effect.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, may be executed sequentially, or may be executed in different orders, as long as the desired result of the technical solution of the present invention can be achieved, and the present invention is not limited thereto.
The above detailed description does not limit the scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a square facula laser module, its characterized in that, square facula laser module includes: a laser chip and a light pattern adjusting lens;
the laser chip comprises a plurality of light-emitting units, and the light-emitting units form a square light-emitting area; the plurality of light emitting units are used for emitting initial laser signals;
the light pattern adjustment lens comprises a first light pattern adjustment surface and a second light pattern adjustment surface; the first light type adjusting surface and the second light type adjusting surface are both located on a propagation path of the initial laser signal, and the first light type adjusting surface and the second light type adjusting surface are used for adjusting the initial laser signal to form an adjusted laser signal; in a first direction, the extension length of the adjusted laser signal is greater than the extension length of the initial laser signal; in a second direction, the extension length of the adjusted laser signal is greater than the extension length of the initial laser signal; the first direction intersects the second direction;
the first light pattern adjustment surface comprises a free-form surface; the second light pattern adjustment surface includes an exit plane.
2. The square spot laser module of claim 1, wherein the refractive index of the beam shape adjusting lens is greater than the refractive index of the transmission environment of the initial laser signal and the refractive index of the transmission environment of the adjusted laser signal.
3. The square spot laser module of claim 1, wherein a distance d1 between a center of the first beam-type adjustment surface and a center of the second beam-type adjustment surface ranges from 0.5mm to d 1mm.
4. The square spot laser module of claim 1, wherein the square light emitting area has a profile with a dimension L along the first direction; the size of the outline of the square light emitting area along the second direction is W; wherein W is less than L;
the distance between the center of the first light type adjusting surface and the center of the laser chip is d2; wherein, L is less than or equal to d2 and less than or equal to 2L.
5. The square spot laser module of claim 1, wherein the beam pattern adjusting lens is a central symmetrical structure.
6. The square spot laser module of claim 1, wherein the free-form surface has a shape that satisfies:
wherein x is a coordinate value in a first direction, y is a coordinate value in a second direction, and z is a coordinate value in a third direction, and the third direction is perpendicular to both the first direction and the second direction; c is the radius of curvature; k is a conic constant;
A. b, C, D, E and F are the constant coefficients of the free form surface, respectively.
7. The square spot laser module of claim 6, wherein the conic constant k is in a range of-2 to-1.
8. The square spot laser module of claim 1, further comprising: a substrate; the backlight surface of the laser chip is fixed on one side of the substrate; the substrate is electrically connected with the laser chip through a bonding pad.
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| CN202221959180.2U CN217823696U (en) | 2022-07-27 | 2022-07-27 | Square facula laser module |
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| CN202221959180.2U CN217823696U (en) | 2022-07-27 | 2022-07-27 | Square facula laser module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115241735A (en) * | 2022-07-27 | 2022-10-25 | 常州纵慧芯光半导体科技有限公司 | Square light spot laser module and parameter determination method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115241735A (en) * | 2022-07-27 | 2022-10-25 | 常州纵慧芯光半导体科技有限公司 | Square light spot laser module and parameter determination method thereof |
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