Separated optical lens
By designing a separate optical lens, the combination of separate optical interfaces between the incident interface and the exit interface is solved, and the complex structure and manufacturing process of the EEL light emitting device is achieved, which simplifies the process and reduces the cost.
Patent Information
- Application Number
- CN202311175214.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-13
- Publication Date
- 2025-03-14
AI Technical Summary
In the prior art, the structure and production process of EEL light emitting devices are complex, have high production costs, low yield, and poor light output effect.
A separate optical lens is designed, including an incident interface and an exit interface. The incident interface and an exit interface are respectively a convex free curved surface or a convex free curved surface and a plane combination. The incident interface shrinks from top to bottom toward the exit interface, and optical shaping is achieved through the combination of separate optical interfaces.
A separate optical lens with good light output effect is achieved, which simplifies the production process, improves production efficiency and yield, and reduces production costs.
Smart Images
Figure CN119617334A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of semiconductor light emitting, and in particular, relates to a split optical lens. Background Art
[0002] Semiconductor light sources are widely used in various lighting equipment, detection equipment, lidar systems and various electronic equipment due to their advantages of small size, low power consumption, long service life and high brightness. Currently, several common light sources include edge emitting lasers (EEL), vertical cavity surface emitting lasers (VCSEL), solid lasers and fiber lasers.
[0003] In order to meet the needs of application scenarios, the semiconductor light source needs to be optically shaped. Optical shaping usually involves adding an optical lens to the outside of the light source. The optical lens needs to be set to a corresponding surface shape according to the light output effect. However, some surface shapes can meet optical requirements but the manufacturing process is difficult, the manufacturing cost is high, and the finished product effect is not ideal. Figure 8 A cavity structure 5 is provided between the EEL light emitting chip 6 and the optical lens 4, and an optical interface 41 is provided on the inner side wall of the cavity structure 5 and protrudes toward the EEL light emitting chip 6. The optical interface 41 is difficult to manufacture in terms of manufacturing process. When the inner and outer molds are used for molding, the inner mold will be stuck by the protruding optical interface 41 and it is difficult to demold. That is, after the concave cavity area 51 above the optical interface 41 is filled by the mold, it will be stuck by the protruding optical interface 41 when demolding downward. In order to achieve Figure 8 The light effect can be achieved by Fig. 9 The optical interface 41 is a protrusion arranged outside the cavity structure 5 and away from the EEL light-emitting chip 6, so as to form an optical interface 41 with a convex side. The outer mold can be formed by splicing two upper and lower molds, and the molds are removed from the upper and lower parts respectively after forming. Although this manufacturing process can form Figure 8 The optical interface 41 shown has the same surface shape and faces in opposite directions, but the joint between the upper and lower molds will form a splicing line on the optical interface 41, affecting the light output effect. In addition, in the traditional TO package, the EEL light-emitting chip is die-bonded on the front side, inserted into the TO tube sideways, and then a TO cap is added to the TO tube for a second time, and then an optical lens is set on the TO cap. The second TO cap has very high requirements for optical alignment, complex process, low yield, and high cost.
[0004] Based on the above, the current problem to be solved is: a split optical lens with good light output effect, simple structure and manufacturing process, high yield rate, and meeting the needs of application scenarios. Summary of the invention
[0005] The purpose of the present invention is to provide a split optical lens, aiming to solve the problems in the prior art that the structure and manufacturing process of the EEL light-emitting device are complex, the production cost is high, the yield is low, and the light output effect is poor.
[0006] The present invention is realized as follows: a split optical lens, comprising: an incident interface for inputting light and an exit interface facing away from the incident interface for outputting light;
[0007] The incident interface and the exit interface are configured as free-form surfaces convex in a direction away from each other or a combination of a convex free-form surface and a plane;
[0008] The incident interface shrinks from top to bottom toward the exit interface.
[0009] Further, the incident interface includes a first optical interface and a second optical interface from top to bottom; the exit interface includes a third optical interface and a fourth optical interface from top to bottom; the first optical interface and the third optical interface, the second optical interface and the fourth optical interface are arranged opposite to each other;
[0010] The contour lines of the cross sections of the second optical interface and the third optical interface in the Y-axis and Z-axis planes are a first curve and a second curve, and the first curve and the second curve are convex curves; the first curve shrinks from top to bottom in a direction close to the exit interface, and the second curve expands from top to bottom in a direction away from the incident interface;
[0011] The X-axis, Y-axis, and Z-axis are spatial rectangular coordinate axes. The Z-axis is the optical axis direction of light irradiating from the incident interface to the exit interface, and the Y-axis and X-axis are the up and down and left and right directions of the incident interface respectively.
[0012] Furthermore, the contour lines of the cross sections of the second optical interface and the third optical interface in the X-axis and Z-axis planes are a third curve and a fourth curve, and the third curve and the fourth curve are convex curves with openings facing each other.
[0013] Furthermore, the third curve and the fourth curve are axisymmetric curves respectively, and the axes of symmetry of the third curve and the fourth curve are parallel or overlapped.
[0014] Furthermore, the contour lines of the cross sections of the first optical interface and the fourth optical interface in the Y-axis and Z-axis planes are first contour lines and second contour lines, and the first contour lines and the second contour lines are straight lines or curves.
[0015] Furthermore, a contour line of a cross section of the first optical interface in the X-axis and Z-axis planes is a fifth curve, and the fifth curve is a convex curve.
[0016] Furthermore, the fifth curve is an axisymmetric curve.
[0017] Furthermore, the first optical interface is a cylindrical surface with a consistent cross-section formed by translating the fifth curve up and down along the Y-axis.
[0018] Furthermore, the first optical interface is connected to the second optical interface directly or through a transition interface; the third optical interface is connected to the fourth optical interface directly or through a transition interface; and the transition interface is a plane or a curved surface.
[0019] Compared with the prior art, the split optical lens provided by the present invention has the following beneficial effects:
[0020] 1. The incident interface and the exit interface of the present invention are arranged away from each other and are respectively convex free-form surfaces or a combination of a convex free-form surface and a plane. The present invention converts the entire optical interface 41 (refer to Figure 8-9 ) is arranged as two separate parts, and are respectively arranged at the incident interface and the exit interface, and optical shaping is jointly achieved through the refraction of the incident interface and the exit interface. The incident interface is arranged to shrink from top to bottom toward the exit interface, and such an arrangement is easier to manufacture than the prior art one and the prior art two. Specifically, the split optical lens is molded by upper and lower molds. Since the inner incident interface shrinks from top to bottom toward the exit interface, there is no convex part to hinder the demolding when demolding downwards. The manufacturing process is simple, the production efficiency is high, the yield is high, and the light output effect is good.
[0021] Second, the incident interface and the exit interface are respectively provided with a reversed and displaced second optical interface and a third optical interface, that is, the convex optical interface 41 of the prior art one and the prior art two is separated from the middle and arranged on both sides of the lens. The second optical interface shrinks from top to bottom in the direction close to the exit interface, and the third optical interface expands from top to bottom in the direction away from the incident interface. When the exit interface composed of the third optical interface and the fourth optical interface expands from top to bottom in the direction away from the incident interface, during the compression molding, the outer mold is integrally formed for easy upward removal. When the fourth optical interface shrinks relative to the third optical interface in the direction close to the incident interface, the outer mold can be made of two upper and lower spliced molds. Since the main optical shaping interface (second optical interface) at the lower part of the split optical lens is set away from the third optical interface, the splicing will not affect the optical shaping. Therefore, the structure of the present invention is reasonable and simple, the manufacturing process is simple, and the light output effect is good. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 is a front view of the split optical lens provided by the present invention;
[0023] Figure 2is a rear view of the split optical lens provided by the present invention;
[0024] Figure 3 The present invention provides Figure 1 AA direction cross-sectional view of the split optical lens;
[0025] Figure 4 is a top view of the split optical lens provided by the present invention;
[0026] Figure 5 is a bottom view of the split optical lens provided by the present invention;
[0027] Figure 6 It is a light path diagram of the split optical lens provided by the present invention;
[0028] Figure 7 is a cross-sectional view of another split optical lens provided by the present invention;
[0029] Figure 8 is a cross-sectional view of an optical device of prior art 1;
[0030] Fig. 9 is a cross-sectional view of an optical device of prior art 2;
[0031] In the figure: 1-incident interface; 11-first optical interface; 111-first contour line; 112-fifth curve; 12-second optical interface; 121-first curve; 122-third curve; 2-exit interface; 21-third optical interface; 211-second curve; 212-fourth curve; 22-fourth optical interface; 221-second contour line; 3-transition interface; 4-optical lens; 41-optical interface; 5-cavity structure; 51-recessed cavity area; 6-EEL light-emitting chip. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0033] The implementation of the present invention is described in detail below in conjunction with specific embodiments.
[0034] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0035] Reference Figure 1-9 The figure shows a preferred embodiment of the present invention.
[0036] Reference Figure 1-3 The split optical lens includes an incident interface 1 for inputting light and an exit interface 2 for outputting light which is away from the incident interface 1. The incident interface 1 is set as a convex free-form surface or a combination of a free-form surface and a plane. The exit interface 2 is set as a convex free-form surface or a combination of a free-form surface and a plane away from the incident interface 1. In order to facilitate manufacturing and easy molding and demolding, the cross section of the incident interface 1 shrinks from top to bottom. Specifically, it can be set to gradually shrink from top to bottom, or it can be set to be consistent with the cross section of the upper and middle parts, which is columnar, and the cross section of the lower and middle parts gradually decreases.
[0037] In order to clearly illustrate the structure and surface shape of the split optical lens, the following definitions are made: the X-axis, Y-axis, and Z-axis are spatial rectangular coordinate axes, the Z-axis is the optical axis direction of light from the incident interface 1 to the exit interface 2, and the Y-axis and X-axis are the up and down directions and the left and right directions of the incident interface 1, respectively.
[0038] The incident interface 1 includes, from top to bottom, a first optical interface 11 in the upper middle part and a second optical interface 12 in the lower middle part. The exit interface 2 includes, from top to bottom, a third optical interface 21 in the upper middle part and a fourth optical interface 22 in the lower middle part. The first optical interface 11 and the third optical interface 21, and the second optical interface 12 and the fourth optical interface 22 are arranged opposite to each other. The second optical interface 12 and the third optical interface 21 play the main role of optical shaping surfaces. The first optical interface 11 and the fourth optical interface 22 have a certain deflection effect, but more importantly, they cooperate with the second optical interface 12 and the third optical interface 21 to form a surface structure that is easy to manufacture. The first optical interface 11 is directly connected to the second optical interface 12 or connected through a transition interface 3. The third optical interface 21 is directly connected to the fourth optical interface 22 or connected through a transition interface 3. The transition interface 3 is a plane or a free-form surface.
[0039] The contour lines of the cross section of the second optical interface 12 and the third optical interface 21 in the Y-axis and Z-axis planes are the first curve 121 and the second curve 211, and the first curve 121 and the second curve 211 are convex curves. The first curve 121 shrinks from top to bottom in the direction close to the exit interface 2. The contour lines of the cross section of the first optical interface 11 and the fourth optical interface 22 in the Y-axis and Z-axis planes are the first contour line 111 and the second contour line 221, and the first contour line 111 and the second contour line 221 are straight lines or curves. The overall trend of the combined line formed by the first contour line 111 and the first curve 121 is to shrink from top to bottom in the direction close to the exit interface 2 to achieve a surface structure that is easy to demold. The second curve 211 expands from top to bottom in the direction away from the incident interface 1. Preferably, the overall trend of the combined line formed by the second curve 211 and the second contour line 221 is to expand from top to bottom in the direction close to the incident interface 1. Of course, since the emission interface 2 is generally provided on the outer surface of the lens, it can be made by an integrated mold or a spliced mold separated from top to bottom. Therefore, the overall trend of the combined line formed by the second contour line 221 and the second curve 211 can also be set to expand first and then contract from top to bottom. In this case, a spliced mold is preferably used, which is easy to separate. At the same time, since the second optical interface 12 is provided on the inner surface of the lens, the spliced mold does not affect the light emission effect.
[0040] Reference Figure 4-5 , the contour lines of the cross section of the second optical interface 12 and the third optical interface 21 in the X-axis and Z-axis planes are the third curve 122 and the fourth curve 212. The third curve 122 and the fourth curve 212 are convex curves with openings facing each other. The third curve 122 and the fourth curve 212 are the most convex in the middle, and the two sides shrink towards each other. Preferably, the third curve 122 and the fourth curve 212 are axisymmetric curves, and the symmetry axes of the third curve 122 and the fourth curve 212 are parallel or overlapped, which can ensure that the light spot is symmetrical in the X-axis direction, and the symmetry axis is parallel to the Y-axis. The contour line of the cross section of the first optical interface 11 in the X-axis and Z-axis planes is the fifth curve 112, and the fifth curve 112 is a convex curve. The fifth curve 112 is preferably an axisymmetric curve.
[0041] In a preferred embodiment, the first optical interface 11 is a plane or a curved surface with a consistent cross section in the X-axis and Z-axis planes. The cross section of the second optical interface 12 in the X-axis and Z-axis planes is a convex curved surface that decreases in the direction away from the first optical interface 11. The cross section of the first optical interface 11 is greater than or equal to the maximum cross section of the second optical interface 12. Furthermore, the first optical interface 11 is a convex cylindrical interface, that is, a cylindrical curved surface with a consistent cross section formed by the fifth curve 112 being translated up and down along the Y-axis. The shape and the area enclosed by the fifth curve 112 are consistent with the shape and the maximum area enclosed by the third curve 122. The incident interface 1 of the preferred embodiment is a free-form surface with a cylindrical shape in the upper middle part and a contracted middle and lower part. After the inner and outer molds are molded, there is no convex structure that jams the mold when the inner mold is taken out downward, which is easy to manufacture. At the same time, the surface structure of the present invention meets the light emitting effect of the application scenario.
[0042] The exit interface 2 includes a third optical interface 21 in the upper middle portion and a fourth optical interface 22 in the lower middle portion. The cross-sectional area of the third optical interface 21 in the X-axis and Z-axis planes is a free-form surface that increases in a direction close to the fourth optical interface 22. Figure 7 When the third optical interface 21 is directly connected to the fourth optical interface 22, preferably, the fourth optical interface 22 has a plane or free-form surface with the same cross section in the X-axis and Z-axis planes, and the fourth optical interface 22 is a columnar interface. Furthermore, the cross section of the third optical interface 21 in the X-axis and Z-axis planes has the same area from top to bottom, and is consistent with the shape and area enclosed by the largest cross section of the fourth curve 212 in the X-axis and Z-axis planes. Light irradiates the split optical lens from the incident interface 1 to the exit interface 2, and the optical axis is incident and emitted from the middle of the incident interface 1 and the exit interface 2. Refer to Figure 6 The light path diagram shows that the incident light irradiating the first optical interface 11 is refracted and then emitted from the third optical interface 21; the incident light irradiating the second optical interface 12 is refracted and then emitted from the fourth optical interface 22. Figure 8 ) and prior art 2 (reference Fig. 9 ) is configured as an upper and a lower part and is disposed on two sides of the lens away from each other. While producing the same optical shaping effect as the prior art, it breaks through the bottleneck of the manufacturing process, is easy to manufacture, and has high production efficiency.
[0043] When the third optical interface 21 and the fourth optical interface 22 are connected through the transition interface 3, the transition interface 3 and the fourth optical interface 22 are preferably perpendicular planes to each other, and the optical axis is perpendicular to the fourth optical interface 22. Figure 3 and Figure 6. The exit interface 2 as a whole expands and then contracts from top to bottom. The outer mold is preferably an upper and lower spliced mold, the upper mold is used to form the third optical interface 21, and the lower mold is used to form the fourth optical interface 22. After compression molding, the upper and lower molds are taken out from the upper and lower respectively, and the interface between the upper and lower molds is a transition interface 3, which has no effect on optical shaping. When the outer mold is taken out as a whole upward, there is no convex structure that jams the mold, and it is easy to make. The combined surface shape of the second optical interface 12 and the third optical interface 21 of the present invention meets the requirements of optical shaping and the needs of application scenarios. At the same time, it is easy to make and has a low production cost, and is suitable for large-scale promotion.
[0044] The present invention is not limited thereto; any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A split optical lens, characterized in that: include: An incident interface (1) for inputting light and an exit interface (2) facing away from the incident interface (1) for outputting light; The incident interface (1) and the exit interface (2) are arranged as free-form surfaces convex in a direction away from each other, or as a combination of a convex free-form surface and a plane; The incident interface (1) shrinks from top to bottom towards the exit interface (2).
2. The split optical lens according to claim 1, wherein: The incident interface (1) comprises, from top to bottom, a first optical interface (11) and a second optical interface (12); the exit interface (2) comprises, from top to bottom, a third optical interface (21) and a fourth optical interface (22); the first optical interface (11) and the third optical interface (21), and the second optical interface (12) and the fourth optical interface (22) are arranged opposite to each other. The contour lines of the cross sections of the second optical interface (12) and the third optical interface (21) in the Y-axis and Z-axis planes are a first curve (121) and a second curve (211), and the first curve (121) and the second curve (211) are convex curves; the first curve (121) contracts from top to bottom in a direction approaching the exit interface (2), and the second curve (211) expands from top to bottom in a direction away from the incident interface (1); The X-axis, Y-axis, and Z-axis are spatial rectangular coordinate axes, the Z-axis is the optical axis direction of light irradiating from the incident interface (1) to the exit interface (2), and the Y-axis and X-axis are the up-down and left-right directions of the incident interface (1), respectively.
3. The split optical lens according to claim 2, wherein: The contour lines of the cross sections of the second optical interface (12) and the third optical interface (21) in the X-axis and Z-axis planes are a third curve (122) and a fourth curve (212), and the third curve (122) and the fourth curve (212) are convex curves with openings facing each other.
4. The split optical lens according to claim 3, wherein: The third curve (122) and the fourth curve (212) are respectively axisymmetric curves, and the axes of symmetry of the third curve (122) and the fourth curve (212) are parallel or overlapped.
5. The split optical lens according to claim 2, wherein: The contour lines of the cross sections of the first optical interface (11) and the fourth optical interface (22) in the Y-axis and Z-axis planes are the first contour line (111) and the second contour line (221), and the first contour line (111) and the second contour line (221) are straight lines or curves.
6. The split optical lens according to claim 2, wherein: The contour line of the cross section of the first optical interface (11) in the X-axis and Z-axis planes is a fifth curve (112), and the fifth curve (112) is a convex curve.
7. The split optical lens according to claim 6, wherein: The fifth curve (112) is an axisymmetric curve.
8. The split optical lens according to claim 6, wherein: The first optical interface (11) is a cylindrical surface with a consistent cross section formed by translating the fifth curve (112) up and down along the Y axis.
9. The split optical lens according to claim 1, wherein: The first optical interface (11) is directly connected to the second optical interface (12) or is connected via a transition interface (3); the third optical interface (21) is directly connected to the fourth optical interface (22) or is connected via a transition interface (3); and the transition interface (3) is a plane or a curved surface.