CN113031288A - Packaging structure for improving shape of light spot - Google Patents
Packaging structure for improving shape of light spot Download PDFInfo
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- CN113031288A CN113031288A CN201911361417.XA CN201911361417A CN113031288A CN 113031288 A CN113031288 A CN 113031288A CN 201911361417 A CN201911361417 A CN 201911361417A CN 113031288 A CN113031288 A CN 113031288A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0977—Reflective elements
- G02B27/0983—Reflective elements being curved
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
Abstract
The invention provides a packaging structure for improving the shape of a light spot, which comprises at least one light source and at least one light beam shaping unit, wherein the at least one light beam shaping unit is arranged in one-to-one correspondence with the at least one light source. The light source is used for emitting a light beam, and the light beam comprises a first sub-light beam in a fast axis direction and a second sub-light beam in a slow axis direction; the light beam shaping unit comprises a first optical surface and a second optical surface which are arranged on the emergent light path of the corresponding light source; the first optical surface is a reflecting curved surface and is used for collimating the first sub-beam; the second optical surface is a transmission curved surface and is used for collimating the second sub-beam. In the invention, the first sub-beam and the second sub-beam emitted by the light source are respectively collimated through the first optical surface and the second optical surface of the beam shaping unit, so that the emergent sizes of the first sub-beam and the second sub-beam can be respectively adjusted, the light spot shape of the light source can be improved, and the light spots can be conveniently and closely arranged.
Description
Technical Field
The invention relates to the technical field of packaging, in particular to a packaging structure for improving the shape of a light spot.
Background
The semiconductor laser diode has the advantages of small volume, light weight, low cost, high efficiency and the like, and is widely applied to the fields of industry, medical treatment, communication, military and the like. However, the divergence angle of the laser beam emitted by the semiconductor laser diode along the fast axis direction is about 30 degrees to 40 degrees, the divergence angle along the slow axis direction is about 15 degrees, and the difference between the divergence angle and the divergence angle is large, so that the emergent light spot of the semiconductor laser diode is an elliptical light spot with a large area, which is not beneficial to the tight arrangement of the light spots, and a series of application defects are brought, and the usability of the semiconductor laser diode is greatly reduced.
Disclosure of Invention
In view of this, the present invention provides a package structure for improving the shape of light spots, which can improve the shape of light spots of a light source to facilitate the light spots to be closely arranged.
The invention provides a packaging structure for improving the shape of a light spot, which comprises at least one light source and at least one light beam shaping unit, wherein the at least one light beam shaping unit is arranged in one-to-one correspondence with the at least one light source; the at least one light source is used for emitting light beams, and the light beams comprise first sub-light beams in the fast axis direction and second sub-light beams in the slow axis direction; the light beam shaping unit comprises a first optical surface and a second optical surface which are arranged on the emergent light path of the corresponding light source; the first optical surface is a reflecting curved surface and is used for collimating the first sub-beam; the second optical surface is a transmission curved surface and is used for collimating the second sub-beam.
According to the packaging structure provided by the invention, the first sub-beam and the second sub-beam emitted by the light source are respectively collimated through the first optical surface and the second optical surface of the beam shaping unit, so that the emergent sizes of the first sub-beam and the second sub-beam can be respectively adjusted, and the light spot shape of the light source can be improved, and the light spots can be conveniently and closely arranged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic perspective view of a package structure according to a first embodiment of the invention.
Fig. 2 is a schematic diagram of the optical path of the light beam emitted by the light source in fig. 1.
Fig. 3 is a schematic diagram of the optical path of the first sub-beam in fig. 2.
Fig. 4 is a schematic diagram of the optical path of the second sub-beam in fig. 2.
Fig. 5 is a graph comparing the shape of the excident spots of the light source of fig. 1 before and after collimation.
Fig. 6 is a schematic perspective view of a package structure according to a second embodiment of the invention.
Fig. 7 is a schematic diagram of the optical path of the light beam emitted by the light source in fig. 6.
Fig. 8 is a schematic diagram of the optical path of the first sub-beam in fig. 7.
Fig. 9 is a schematic diagram of an optical path of the second sub-beam in fig. 7.
Fig. 10 is a graph comparing the shape of the excident spots of the light source of fig. 6 before and after collimation.
Fig. 11 is a schematic perspective view of a package structure according to a third embodiment of the invention.
Fig. 12 is a schematic diagram of the optical path of the first sub-beam emitted by the light source in fig. 11.
Fig. 13 is a schematic diagram of the optical path of the second sub-beam emitted by the light source in fig. 11.
Fig. 14 is a schematic perspective view of a package structure according to a fourth embodiment of the invention.
Fig. 15 is a schematic diagram of the optical path of the light beam emitted by the light source in fig. 14.
Fig. 16 is a schematic perspective view of a package structure according to a fifth embodiment of the invention.
Fig. 17 is a schematic diagram of the optical path of the light beam emitted by the light source in fig. 16.
Fig. 18 is a schematic optical path diagram of the first sub-beam emitted by the light source in fig. 17.
Fig. 19 is a schematic diagram of the optical path of the second sub-beam emitted by the light source in fig. 17.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "horizontal", "vertical", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. 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.
Referring to fig. 1 and fig. 2, the present invention provides a package structure 100 for improving the spot shape of a light source 10, wherein the package structure 100 includes at least one light source 10 and at least one beam shaping unit 20 disposed corresponding to the at least one light source 10. The light source 10 is adapted to emit a light beam comprising a first sub-beam 101 in the fast axis direction and a second sub-beam 102 in the slow axis direction. The beam shaping unit 20 includes a first optical surface 201 and a second optical surface 202 disposed on the emergent light path of the corresponding light source 10. The first optical surface 201 is a reflective curved surface and is used for collimating the first sub-beam 101; the second optical surface 202 is a transmission curved surface and is used for collimating the second sub-beam 102.
In the present embodiment, the fast axis direction refers to a direction in which a light beam propagates in parallel to the YOZ plane shown in fig. 1; the slow axis direction refers to a direction in which a front of a light beam reflected by the first optical surface 201 propagates parallel to the XOZ plane shown in fig. 1, and a direction in which a light beam reflected by the first optical surface 201 propagates parallel to the XOY plane shown in fig. 1.
In the present invention, the first sub-beam 101 and the second sub-beam 102 emitted by the light source 10 are collimated by the first optical surface 201 and the second optical surface 202 of the beam shaping unit 20, so that the emitting sizes of the first sub-beam 101 and the second sub-beam 102 can be adjusted respectively, and thus the shape of the light spots of the light source 10 can be improved, which is beneficial to the tight arrangement of the light spots.
Specifically, as shown in fig. 1, the package structure 100 further includes a package substrate 30, the light source 10 and the light beam shaping unit 20 are both packaged and fixed on the package substrate 30, and the light source 10 is located at one side of the light beam shaping unit 20.
It should be noted that each of the light sources 10 and a corresponding one of the beam shaping units 20 form a light emitting module, and each of the light emitting modules can be packaged and fixed on the package substrate 30 by a corresponding fixing structure (not shown). The number of the light emitting modules can be one or multiple. For convenience of description, only one light emitting module is illustrated in the drawings of the embodiments of the present invention.
In this embodiment, the package substrate 30 is a circuit board, the light source 10 includes a semiconductor laser diode 11 and a heat sink 12, the semiconductor laser diode 11 is fixed on the heat sink 12, the heat sink 12 is fixed on the package substrate 30, and the package substrate 30 is electrically connected to the semiconductor laser diode 11 to drive the semiconductor laser diode 11 to emit light. The package substrate 30 can function as a heat dissipation base, and the semiconductor laser diode 11 is fixedly arranged on the package substrate 30 through the heat sink 12, which is beneficial to improving the heat dissipation efficiency of the semiconductor laser diode 11, so that the semiconductor laser diode 11 can emit light for a long time without being damaged due to overhigh temperature.
As described above, the divergence angle of the light beam emitted from the semiconductor laser diode in the fast axis direction is different from the divergence angle of the light beam in the slow axis direction, and if the light beam is not shaped, the light spot formed by the light beam is an elliptical light spot with a large area, which is not favorable for the application of the semiconductor laser diode. In the present invention, in order to improve the spot shape of the light source 10, the light beam shaping unit 20 is correspondingly disposed on one side of the light source 10, so as to shape the light beam emitted by the light source 10 correspondingly.
Specifically, as shown in fig. 1, in the present embodiment, the beam shaping unit 20 includes a first optical element 21 and a second optical element 22, the first optical element 21 and the second optical element 22 are sequentially disposed along the optical path direction of the light source 10, the light source 10 is located at the focal point of the first optical element 21, and the second optical element 22 is located right above the first optical element 21.
More specifically, in the present embodiment, the first optical element 21 is a plano-concave mirror, and the plano-concave mirror includes a reflecting surface 201 in a shape of a uniaxial paraboloid, and the reflecting surface 201 of the plano-concave mirror is the first optical surface 201; the second optical element 22 is a plano-convex transmission mirror, which includes a cylindrical transmission surface 202 in the shape of a uniaxial paraboloid and a planar transmission surface 204 in the shape of a plane, and the cylindrical transmission surface 202 of the plano-convex transmission mirror is the second optical surface 202.
Wherein an axial direction of the reflecting surface 201 (i.e., a direction parallel to an X axis in fig. 1) is perpendicular to a fast axis direction of the light beam emitted from the semiconductor laser diode 11, and an axial direction of the cylindrical transmitting surface 202 (i.e., a direction parallel to a Z axis in fig. 1) is parallel to the fast axis direction of the light beam emitted from the semiconductor laser diode 11, i.e., axial directions of the reflecting surface 201 and the cylindrical transmitting surface 202 are perpendicular to each other, i.e., axial directions of the first optical surface 201 and the second optical surface 202 are perpendicular to each other.
In this embodiment, after the light beam emitted from the semiconductor laser diode 11, the light beam horizontally irradiates on the reflection surface 201 (i.e., the first optical surface 201) of the plano-concave reflecting mirror from one side, and under the reflection action of the reflection surface 201, the light beam irradiates on the plano-convex transmitting mirror in the direction perpendicular to the package substrate 30, sequentially passes through the plane transmission surface 204 and the cylindrical surface transmission surface 202 (i.e., the second optical surface 202) of the plano-convex transmitting mirror, and is transmitted out from the cylindrical surface transmission surface 202.
As shown in fig. 2, a first sub-beam 101 included in the beam and diverging in the fast axis direction is reflected by the first optical surface 201 and then collimated into a parallel beam, and a second sub-beam 102 included in the beam and diverging in the slow axis direction is transmitted by the second optical surface 202 and then also collimated into a parallel beam.
Specifically, referring to fig. 3 and 4 together, in the present embodiment, a cross-sectional line of the first optical surface 201 along the fast axis direction (i.e., a contour line when the first optical surface 201 intersects a plane parallel to the YOZ plane in fig. 1) is a parabola, and a cross-sectional line along the slow axis direction (i.e., a contour line when the first optical surface 201 intersects a plane parallel to the XOZ plane in fig. 1) is a straight line; a cross-sectional line of the second optical surface 202 in the fast axis direction (i.e., a contour line of the second optical surface 202 when it intersects a plane parallel to the YOZ plane in fig. 1) is a straight line, and a cross-sectional line in the slow axis direction (i.e., a contour line of the second optical surface 202 when it intersects a plane parallel to the XOY plane in fig. 1) is a parabolic line; the section line of the planar reflective surface 204 in the fast axis direction (i.e., the contour line when the planar reflective surface 204 intersects a plane parallel to the YOZ plane in fig. 1) and the section line in the slow axis direction (i.e., the contour line when the planar reflective surface 204 intersects a plane parallel to the XOY plane in fig. 1) are both straight lines.
As shown in fig. 3, after the light beam emitted from the semiconductor laser diode 11, the first sub-light beam 101 is diverged to be directed to the first optical surface 201, and after being reflected by the first optical surface 201, the first sub-light beam 101 is collimated and is directed to the second optical element 22 in parallel; it can be understood that, when the parallel light beams are perpendicularly emitted to the transmission surface, the propagation direction of the parallel light beams is not changed, therefore, when the collimated first sub-light beams 101 are parallel emitted to the second optical element 22 along the direction perpendicular to the second optical element 22, the propagation direction of the first sub-light beams 101 is not changed at the plane transmission surface 204 and the second optical surface 202, and the first sub-light beams 101 are parallel transmitted through the second optical element 22.
In this embodiment, in order to collimate the first sub-beams 101 divergently towards any position of the first optical surface 201 and to enable the first sub-beams 101 to enter the second optical element 22 in parallel along a direction perpendicular to the second optical element 22, the curvatures of the first optical surface 201 at different positions along the fast axis direction are different, that is, the section of the first optical surface 201 along the fast axis direction is a parabola whose curvature varies continuously.
It is understood that when the distance between the semiconductor laser diode 11 and the first optical element 21 is changed, the incident angle of the first sub-beam 101 on the first optical surface 201 is also changed, and the curvature of the first optical surface 201 is also changed, so that the first optical surface 201 can collimate the first sub-beam 101 and emit the first sub-beam 101 in the direction perpendicular to the second optical element 22. That is, in a specific embodiment, when the distance between the light source 10 and the first optical element 21 is determined, the curvature of the section line of the first optical surface 201 along the fast axis direction is uniquely determined, and the parabolic shape of the first optical surface 201 is determined accordingly.
As shown in fig. 4, after the light beam emitted from the semiconductor laser diode 11, the second sub-light beam 102 is diverged to emit to the first optical surface 201, and after being reflected by the first optical surface 201, the second sub-light beam 201 is diverged to emit to the second optical element 22, and is collimated by the second optical surface 202 and then is transmitted in parallel.
Before the second sub-beam 102 is collimated by the second optical surface 202, the second sub-beam 102 passes through the planar transmission surface 204, the second sub-beam 102 enters the lens from the air, the second sub-beam 102 is refracted at the planar transmission surface 204, the divergence angle of the second sub-beam 102 is correspondingly reduced, the second sub-beam 102 with the reduced divergence angle is diverged to the second optical surface 202 and refracted again at the second optical surface 202 to be collimated, and the second sub-beam 102 is transmitted in parallel.
It should be noted that the second sub-beam 102 is a beam symmetrically diverging along the slow axis direction, and after being reflected by the first optical surface 201 and refracted by the planar transmission surface 204, the second sub-beam 102 is still a beam symmetrically diverging along the slow axis direction, and when the second sub-beam 102 is irradiated onto the second optical surface 202, the incident angles of the second sub-beam 102 at two positions axially symmetric to the second optical surface 202 are equal, so that, in order to make the second sub-beam 102 be collimated and transmitted in parallel after being refracted by the second optical surface 202, the curvatures of the cross-section lines of the second optical surface 201 along the slow axis direction at two positions axially symmetric are equal in this embodiment, that is, the cross-section line of the second optical surface 201 along the slow axis direction is an axially symmetric parabola.
It is understood that when any one of the distance between the light source 10 and the first optical element 21 or the distance between the second optical element 22 and the first optical element 21 is changed, the incident angle of the second sub-beam 102 on the second optical surface 202 is also changed, and the curvature of the second optical surface 202 is changed accordingly, so that the second optical surface 202 can collimate the second sub-beam 101. That is, in the specific embodiment, the distance between the second optical element 22 and the first optical element 21 is determined, the curvature of the cross section line of the second optical surface 202 in the slow axis direction is uniquely determined, and the cylindrical surface shape of the second optical surface 202 is determined accordingly.
As described above, the first sub-beam 101 and the second sub-beam 102 are collimated by the first optical surface 201 and the second optical surface 202, respectively, so that the first sub-beam 101 and the second sub-beam 102 are respectively changed from a divergent beam to a parallel beam, and the emergent sizes of the first sub-beam 101 and the second sub-beam 102 can be respectively compressed compared with the non-collimated beam, thereby improving the spot shape of the light source 10, and reducing the area of the spot, so as to facilitate the tight arrangement of the spots.
The compressed amount of the emitting sizes of the first sub-beam 101 and the second sub-beam 102 is related to the distance between the light source 10, the first optical element 21 and the second optical element 22.
Specifically, as shown in fig. 3, in the present embodiment, the first sub-beam 101 is reflected at the first optical surface 201, collimated into parallel beams, and finally emitted in parallel, and the emission size L1 of the first sub-beam 101 is the horizontal distance between the edge beams. The size of the exit dimension L1 of the first sub-beam 101 is related to the initial divergence angle α of the first sub-beam 101, the distance between the light source 10 (i.e. the semiconductor laser diode 11) and the first optical element 21 (i.e. the first optical surface 201) and the curvature of the cross-section of the first optical surface 201 in the fast axis direction.
It will be appreciated that, once the type of light source 10 is determined, the initial divergence angle α of the first sub-beam 101 is a determined value; furthermore, as mentioned above, in the specific embodiment, when the distance between the light source 10 and the first optical element 21 is determined, the curvature of the section line of the first optical surface 201 along the fast axis direction is uniquely determined, and therefore, the distance between the light source 10 and the first optical element 21 is controlled, that is, the size of the emitting dimension L1 of the first sub-beam 101 is controlled.
As shown in fig. 4, in this embodiment, after the second sub-beam 102 is reflected by the first optical surface 201 and refracted by the planar transmission surface 204 of the second optical element 22, the second sub-beam 102 is collimated at the second optical surface 202 into parallel beams and finally exits in parallel, and the exit size L2 of the second sub-beam 102 is also the horizontal distance between the edge beams. The size of the exit dimension L2 of the second sub-beam 102 is related to the initial divergence angle β of the second sub-beam 102, the distance between the light source 10 (i.e. the semiconductor laser diode 11) and the first optical element 21 (i.e. the first optical surface 201), the distance between the first optical element 21 and the second optical element 22, and the thickness of the second optical element 22 itself (i.e. the maximum distance between the planar transmission surface 204 and the second optical surface 202).
Similarly, once the type of the light source 10 is determined, the initial divergence angle β of the second sub-beam 102 is also a determined value; in addition, in a specific embodiment, the thickness of the second optical element 22 is also fixed, so that the size of the exit dimension L2 of the second sub-beam 102 can be controlled by controlling the distance between the light source 10 and the first optical element 21 and/or the distance between the first optical element 21 and the second optical element 22.
In summary, by reasonably controlling the distance between the light source 10 and the first optical element 21 and the distance between the first optical element 21 and the second optical element 22, the emitting size L1 of the first sub-beam 101 and the emitting size L2 of the second sub-beam 102 can be respectively controlled, so as to improve the spot shape of the light source 10 and reduce the area of the spot. It can be understood that the emitting sizes of the first sub-beam 101 and the second sub-beam 102 can be controlled and adjusted simultaneously, or the emitting size of only one of the sub-beams can be controlled and adjusted, which can improve the spot shape of the light source 10. Preferably, in some embodiments, to reduce the loss of light amount of the light beam emitted from the light source 10, only a single sub-beam is compressed and adjusted.
Specifically, as shown in fig. 5, in this embodiment, when the distance between the light source 10 and the first optical element 21 and the distance between the first optical element 21 and the second optical element 22 are properly set, only the emitting size L1 of the first sub-beam 101 is compressed, and the emitting size L1 of the first sub-beam 101 may be equal to the emitting size L2 of the second sub-beam 102, so that the shape of the light spot of the light source 10 can be improved to a circular light spot, the area of the circular light spot is smaller than the area of an elliptical light spot formed when the light source 10 is not collimated, which is favorable for the light spots to be closely arranged, so that the distance between two adjacent light emitting modules when a plurality of light emitting modules composed of the light source 10 and the corresponding beam shaping unit 20 are arranged in an array is smaller, and the optical expansion amount of the light emitted by the plurality of light emitting modules as a whole is further reduced, the brightness of the light emitted by the LED is improved.
In other embodiments, the exit size L1 of the first sub-beam 101 and the exit size L2 of the second sub-beam 102 can be compressed at the same time, the exit size L1 of the first sub-beam 101 is equal to or larger than the exit size L2 of the second sub-beam 102, the light spot of the light source 10 has a circular shape or a shape close to a circular shape, the area of the light spot is smaller, the light spot is more favorably arranged in a compact manner, and accordingly, the light quantity loss is increased.
Preferably, in the present invention, the first optical element 21 may be disposed on the first optical surface 201 with a dielectric reflective layer or a metal reflective layer, so as to enhance the reflection of the first optical surface 201 on the first sub-beam 101, and improve the light-emitting brightness of each of the light-emitting modules.
Referring to fig. 6 and 7, a package structure 100b according to a second embodiment of the present invention is similar to the package structure 100 according to the first embodiment, except that: in the second embodiment, the second optical element 22 and the first optical element 21 are sequentially disposed along the optical path direction of the light source 10, the second optical element 22 is located between the light source 10 and the first optical element 21, and the light beam emitted by the light source 10 sequentially passes through the second optical surface 202b of the second optical element 22 and the first optical surface 201b of the first optical element 21. In this embodiment, on the propagation path of the light beam emitted by the light source 10, the second sub-light beam 102 included in the light beam is collimated by the second optical surface 202b first, and the first sub-light beam 101 included in the light beam is collimated by the first optical surface 201b later.
Specifically, as shown in fig. 8, in this embodiment, after the light beam emitted by the semiconductor laser diode 11 (i.e., the light source 10), the first sub-light beam 101 is divergently incident on the second optical element 22, the first sub-light beam 101 sequentially passes through the planar transmission surface 204 and the second optical surface 202b of the second optical element 22 and is transmitted out, and the first sub-light beam 101 is divergently emitted to the first optical surface 201b, and is collimated by the first optical surface 201b and then reflected in parallel.
When the first sub-beam 101 passes through the planar transmission surface 204 and the second optical surface 202b, the first sub-beam 101 is refracted once at the planar transmission surface 204 and the second optical surface 202b, respectively, and the divergence angle of the first sub-beam 101 after being refracted twice is unchanged.
As shown in fig. 9, in this embodiment, after the light beam emitted by the semiconductor laser diode 11, the second sub-light beam 102 diverges and enters the second optical element 22, the second sub-light beam 102 sequentially passes through the planar transmission surface 204 and the second optical surface 202b, similarly, the second sub-light beam 102 is refracted at the planar transmission surface 204 and at the second optical surface 202b, the second sub-light beam 102 is refracted at the second optical surface 202b and then collimated, and the second sub-light beam 102 is parallel-emitted to the first optical surface 201b and is parallel-reflected by the first optical surface 201 b.
In this embodiment, the first sub-beam 101 and the second sub-beam 102 are collimated by the first optical surface 201b and the second optical surface 202b, respectively, so that the first sub-beam 101 and the second sub-beam 102 are respectively changed from a divergent beam to a parallel beam, and the emergent sizes of the first sub-beam 101 and the second sub-beam 102 can be respectively compressed compared with the non-collimated beam, which can also improve the spot shape of the light source 10.
Wherein, the emitting size L1b of the first sub-beam 101 and the emitting size L2b of the second sub-beam 102 can be controlled by controlling the distance between the light source 10 and the second optical element 22 and the distance between the second optical element 22 and the first optical element 21.
It should be noted that the collimation order of the first sub-beam 101 and the second sub-beam 102 is opposite to the collimation order in the first embodiment, and compared with the first embodiment, the distance that the first sub-beam 101 divergently propagates before the first sub-beam 101 is collimated is relatively longer, and the distance that the second sub-beam 102 divergently propagates before the second sub-beam 102 is collimated is relatively shorter, so that after being collimated, the relative compression amount of the exit size L1b of the first sub-beam 101 is smaller than the relative compression amount of the exit size L2b of the second sub-beam 102. As shown in fig. 10, in this embodiment, the emitting size L1b of the first sub-beam 101 is much larger than the emitting size L2b of the second sub-beam 102, and the light spot of the light source 10 is a slender ellipse, which can be applied to some occasions requiring the light spot to be in a slender shape.
Referring to fig. 11 to 13, a package structure 100c according to a third embodiment of the present invention is similar to the package structure 100 according to the first embodiment, except that: in the third embodiment, the beam shaping unit 20 includes only one optical element, and the optical element includes a reflecting surface 203 having a biaxial parabolic shape, specifically, a cross section of the reflecting surface 203 in the fast axis direction is a first parabola, and a cross section of the reflecting surface 203 in the slow axis direction is a second parabola. In this embodiment, the light source 10 is disposed at a focal point of the reflection surface 203, the light beam emitted by the light source 10 is reflected by the reflection surface 203 and emitted in a direction perpendicular to the package substrate 30, and both the first sub-light beam 101 and the second sub-light beam 102 included in the light beam are collimated by the reflection surface 203.
Wherein the first parabola is different from the second parabola, the first parabola is a parabola whose curvature is continuously changed, and the second parabola is an axisymmetric parabola.
It can be understood that when the distance between the light source 10 and the reflecting surface 203 is different, the corresponding reflecting surface 203 has different surface structures, and therefore, the light beam emitted by the light source 10 is reflected by the reflecting surface 203 to form different spot shapes. In some embodiments, the light spot formed by the light source 10 can be modified to be circular or elongated elliptical, depending on the planar configuration of the reflecting surface 203.
In this embodiment, the first sub-beam 101 and the second sub-beam 102 emitted by the light source 10 are collimated by the same reflecting surface 203, and an additional shaping lens is not required to be added in a subsequent light path, and the light beam shaping unit 20 has a simple structure, which is beneficial to the array arrangement of a plurality of light emitting modules composed of the light source 10 and the light beam shaping unit 20.
Referring to fig. 14 and fig. 15 together, a package structure 100d according to a fourth embodiment of the present invention is similar to the package structure 100 according to the first embodiment, except that: in the fourth embodiment, the beam shaping unit 20 only includes a third optical element 23, the third optical element 23 is an optical element that is integrally formed and has a special-shaped structure, the third optical element 23 can be regarded as a combination of the first optical element 21 and the second optical element 22 in the first embodiment, the third optical element 23 includes a reflection surface (i.e., the first optical surface 201), a plane transmission surface 204, and a cylindrical transmission surface (i.e., the second optical surface 202), and the plane transmission surface 204 is hollowed out from the first optical surface 201.
The light beam emitted by the light source 10 sequentially passes through the first optical surface 201, the planar transmission surface 204 and the second optical surface 202, the first sub-light beam 101 included in the light beam is firstly collimated by the first optical surface 201, and the second sub-light beam 102 included in the light beam is then collimated by the second optical surface 202, so that the spot shape of the light source 10 can be improved. It can be understood that, in this embodiment, the propagation paths of the first sub-beam 101 and the second sub-beam 102 are the same as those in the first embodiment (see fig. 3 and fig. 4), and therefore, the variation law of the characteristics thereof is also the same as that in the first embodiment, and will not be described again here.
In this embodiment, the beam shaping unit 20 only includes one third optical element 23, and the number of the optical elements is small, which is beneficial to fixing the optical elements on the package substrate 30 in a package manner; moreover, the reflecting surface (i.e., the first optical surface 201) and the transmitting surface (i.e., the second optical surface 202) are formed on the same optical element, and after the third optical element 23 is packaged and fixed, the positions of the two collimating surfaces are relatively fixed, which is beneficial to improving the size consistency of the light spots formed by the light source 10 after collimation.
Referring to fig. 16 to 19, a package structure 100e according to a fifth embodiment of the present invention is similar to the package structure 100d according to the fourth embodiment, except that: in the fifth embodiment, the third optical element 23b is an optical element with a solid structure, the third optical element 23b includes a planar transmission surface 200, a reflection surface (i.e., the first optical surface 201), and a cylindrical transmission surface (i.e., the second optical surface 202), the light beam emitted by the light source 10 passes through the planar transmission surface 200, the first optical surface 201, and the second optical surface 202 in sequence, the light beam includes the first sub-light beam 101 that is collimated by the first optical surface 201, and the light beam includes the second sub-light beam 102 that is collimated by the second optical surface 202, so as to improve the spot shape of the light source 10.
The first sub-beam 101 and the second sub-beam 102 are refracted when passing through the planar transmission surface 200, and the divergence angles of the refracted first sub-beam 101 and the refracted second sub-beam 102 are reduced and then are sequentially collimated along the propagation paths thereof.
In this embodiment, the third optical element 23b is a solid structure, and compared with the irregular hollow structure in the fourth embodiment, the structure is simple, and the integral processing and forming are facilitated.
It should be noted that, in the above description of the embodiments, the light source 10 is regarded as a point light source, and for the point light source, when the first optical surface 201 and the second optical surface 202 are respectively a single-axis paraboloid reflecting surface and a cylindrical transmitting surface, the collimation effect on the first sub-beam 101 and the second sub-beam 102 of the light source 10 is the best. In other embodiments, the light source 10 may be a bar-shaped extended light source, in which case, the first optical surface 201 is preferably a free-form surface, and a cross-sectional line of the first optical surface 201 along the fast axis direction is a free-form curve, and a cross-sectional line along the slow axis direction is a straight line; the second optical surface 202 is preferably an aspheric or free-form transmission surface, a cross-sectional line of the second optical surface 202 along the fast axis direction is a straight line, and a cross-sectional line along the slow axis direction is a free-form curve; it can be understood that the first optical surface 201 in the free-form surface shape and the second optical surface 202 in the aspheric shape or the free-form surface shape can also respectively implement the compression of the emitting sizes of the first sub-beam 101 and the second sub-beam 102 to improve the spot shape of the light source 10, and the arrangement manner and the operation principle of the light source 10, the first optical surface 201 and the second optical surface 202 are similar to those described in the foregoing embodiments, and are not repeated herein.
The foregoing is illustrative of embodiments of the present invention, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the embodiments of the present invention and are intended to be within the scope of the present invention.
Claims (11)
1. A package structure for improving a spot shape, comprising:
at least one light source for emitting a light beam, wherein the light beam comprises a first sub-beam along a fast axis direction and a second sub-beam along a slow axis direction; and
the light beam shaping unit is arranged in one-to-one correspondence with at least one light source and comprises a first optical surface and a second optical surface which are arranged on the emergent light path of the corresponding light source;
the first optical surface is a reflecting curved surface and is used for collimating the first sub-beam; the second optical surface is a transmission curved surface and is used for collimating the second sub-beam.
2. The package structure of claim 1, wherein a cross-sectional line of the first optical surface in a fast axis direction is a parabola or a free curve, and a cross-sectional line in a slow axis direction is a straight line; the section line of the second optical surface along the direction of the fast axis is a straight line, and the section line along the direction of the slow axis is a parabola or a free curve.
3. The package structure of claim 2, wherein the beam shaping unit comprises a first optical element and a second optical element, the first optical surface being a reflective surface of the first optical element, and the second optical surface being a transmissive surface of the second optical element.
4. The package structure according to claim 3, wherein the first optical element and the second optical element are sequentially disposed along an optical path direction of the light source, and a light beam emitted by the light source sequentially passes through the first optical surface and the second optical surface;
the first sub-beam is diverged to be emitted to the first optical surface, after being reflected by the first optical surface, the first sub-beam is collimated and emitted into the second optical element in parallel, and is transmitted out in parallel through the second optical surface; the second sub-beam is diverged to be emitted to the first optical surface, and after being reflected by the first optical surface, the second sub-beam is diverged to be emitted to the second optical element, and is collimated by the second optical surface and then is transmitted in parallel.
5. The package structure of claim 4, wherein the distance between the light source and the first optical element and the distance between the first optical element and the second optical element are controlled such that the first sub-beam has an exit size equal to the exit size of the second sub-beam, and the light spot emitted by the light source has a circular shape.
6. The package structure according to claim 3, wherein the second optical element and the first optical element are sequentially disposed along an optical path direction of the light source, and a light beam emitted by the light source sequentially passes through the second optical surface and the first optical surface;
the first sub-beam is divergently emitted into the second optical element, and after being transmitted by the second optical surface, the first sub-beam is divergently emitted to the first optical surface, and is collimated by the first optical surface and then reflected in parallel; the second sub-beam is divergently incident to the second optical element, and after being transmitted by the second optical surface, the second sub-beam is collimated and parallelly emitted to the first optical surface, and is parallelly reflected by the first optical surface.
7. The package structure of claim 6, wherein the distance between the light source and the second optical element and the distance between the second optical element and the first optical element are controlled such that the first sub-beam has an exit size larger than the second sub-beam and the light spot emitted by the light source has an elongated oval shape.
8. The package structure of claim 2, wherein the beam shaping unit comprises a third optical element, the first optical surface is a reflective surface of the third optical element, and the second optical surface is a transmissive surface of the third optical element; the light beam emitted by the light source sequentially passes through the first optical surface and the second optical surface;
the first sub-beam is diverged to be emitted to the first optical surface, after being reflected by the first optical surface, the first sub-beam is collimated and emitted into the second optical element in parallel, and is transmitted out in parallel through the second optical surface; the second sub-beam is diverged to be emitted to the first optical surface, and after being reflected by the first optical surface, the second sub-beam is diverged to be emitted to the second optical element, and is collimated by the second optical surface and then is transmitted in parallel.
9. The package structure of claim 1, wherein the first optical element has a dielectric reflective layer or a metal reflective layer disposed on the first optical surface to enhance reflection of the first optical surface to the first sub-beam.
10. The package structure of claim 1, wherein the package structure further comprises a package substrate, and the light source and the beam shaping unit are both packaged and fixed on the package substrate.
11. The package structure of claim 10, wherein the light source comprises a semiconductor laser diode and a heat sink, the semiconductor laser diode is secured to the heat sink, and the heat sink is secured to the package substrate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911361417.XA CN113031288A (en) | 2019-12-24 | 2019-12-24 | Packaging structure for improving shape of light spot |
| PCT/CN2020/137085 WO2021129501A1 (en) | 2019-12-24 | 2020-12-17 | Package structure for improving light spot shape |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911361417.XA CN113031288A (en) | 2019-12-24 | 2019-12-24 | Packaging structure for improving shape of light spot |
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| CN113031288A true CN113031288A (en) | 2021-06-25 |
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| CN201911361417.XA Pending CN113031288A (en) | 2019-12-24 | 2019-12-24 | Packaging structure for improving shape of light spot |
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| WO (1) | WO2021129501A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460741A (en) * | 2022-01-21 | 2022-05-10 | 华中科技大学 | Annular facula optical system of free-form surface mirror |
| CN114966925A (en) * | 2022-06-10 | 2022-08-30 | 上海嘉强自动化技术有限公司 | Reflective broadband integrating mirror and broadband optical fiber laser optical system |
| CN116295052A (en) * | 2023-03-21 | 2023-06-23 | 江苏泽景汽车电子股份有限公司 | Measuring device and measuring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6556352B2 (en) * | 2000-08-23 | 2003-04-29 | Apollo Instruments Inc. | Optical coupling system |
| US6975465B1 (en) * | 2002-04-03 | 2005-12-13 | University Of Central Florida Research Foundation, Inc. | Method and apparatus for use of beam control prisms with diode laser arrays |
| WO2015126475A1 (en) * | 2013-11-07 | 2015-08-27 | Binoptics Corporation | Lasers with beam shape and beam direction modification |
| CN204631362U (en) * | 2015-05-11 | 2015-09-09 | 宁波远明激光技术有限公司 | Semiconductor laser beam collimator apparatus |
| DE102016102591A1 (en) * | 2016-02-15 | 2017-08-17 | Limo Patentverwaltung Gmbh & Co. Kg | Device for shaping laser radiation |
| CN110429465A (en) * | 2019-07-03 | 2019-11-08 | 江苏天元激光科技有限公司 | A kind of semiconductor laser hierarchic structure is heat sink |
| CN211786401U (en) * | 2019-12-24 | 2020-10-27 | 深圳光峰科技股份有限公司 | Packaging structure for improving shape of light spot |
-
2019
- 2019-12-24 CN CN201911361417.XA patent/CN113031288A/en active Pending
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- 2020-12-17 WO PCT/CN2020/137085 patent/WO2021129501A1/en active Application Filing
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114460741A (en) * | 2022-01-21 | 2022-05-10 | 华中科技大学 | Annular facula optical system of free-form surface mirror |
| CN114966925A (en) * | 2022-06-10 | 2022-08-30 | 上海嘉强自动化技术有限公司 | Reflective broadband integrating mirror and broadband optical fiber laser optical system |
| CN116295052A (en) * | 2023-03-21 | 2023-06-23 | 江苏泽景汽车电子股份有限公司 | Measuring device and measuring system |
| CN116295052B (en) * | 2023-03-21 | 2024-03-22 | 江苏泽景汽车电子股份有限公司 | Measuring device and measuring system |
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| WO2021129501A1 (en) | 2021-07-01 |
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