Lens and light source device adopting same

Abstract

The invention relates to the technical field of semiconductor light emitting, and discloses a lens and a light source device adopting the lens. The lens comprises a first optical interface, a second optical interface and a third optical interface. The first optical field is arranged to be a plane and used for inputting light. The second optical interface is arranged to be a plane or a free-form surface and used for outputting light. The third optical interface is connected with the peripheral edges of the first optical interface and the second optical interface, and the included angle alpha between the first optical interface and the third optical interface is larger than or equal to 60 degrees and smaller than or equal to 120 degrees. The lens is small in size, high in light energy utilization rate and good in light emitting effect. The light source device is reasonable and simple in structure, small in size and high in integration degree; multicolor luminescence is realized, and luminescence is stable; the light energy utilization rate is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor light emitting, and in particular, relates to a lens and a light source device using the lens. Background Art

[0002] Traditional optical systems are large in size, poor in stability, and difficult to align and collimate light beams, and cannot meet the needs of the development of optoelectronic technology. Semiconductor light sources are widely used in various lighting equipment, detection equipment, laser radar systems, and various electronic equipment due to their advantages such as small size, low power consumption, long service life, and high brightness. With the rapid development of microelectronics technology, the integration and miniaturization of semiconductor optical devices have become an inevitable trend to meet the needs of different application scenarios.

[0003] Integrated light source device of prior art, refer to Figure 8 , the light-emitting surface of the first light-emitting chip 3 is often covered with a lens 1, and the light-emitting surface (outer surface) of the lens 1 is often set as a convex surface. According to the refraction principle, Fig. 9 As shown, when the incident light source C1 is set at the center of curvature P of the convex surface, the outgoing light source C2 does not refract; when the incident light source D1 is set below the center of curvature P of the convex surface, the outgoing light source D2 undergoes focusing refraction; when the incident light source E1 is set above the center of curvature P of the convex surface, the outgoing light source E2 undergoes divergent refraction. In order to obtain an outgoing light source D2 with a relatively converging effect, the incident light source D1 needs to be set below the center of curvature P. When the size of the first light-emitting chip 3 is large, the entire lens 1 occupies a large space, which is not conducive to optical integration. At the same time, the large-angle light at the edges of the prior art is not fully utilized, resulting in waste of light energy, unsatisfactory light spot effect, and easy formation of adjacent light interference.

[0004] Based on the above, the problem to be solved at present is: to provide a lens with small size, easy integration, high light energy utilization rate and stable light output effect, and a light source device using the lens. Summary of the invention

[0005] The object of the present invention is to provide a lens and a light source device using the lens, aiming to solve the problems in the prior art that the light source device is large in size, difficult to integrate, has low light energy utilization rate and poor light output effect.

[0006] The present invention is realized by a lens and a light source device using the lens, wherein the lens comprises

[0007] A first optical interface, which is arranged as a plane and is used for inputting light;

[0008] A second optical interface, which is configured as a plane or a free-form surface, for outputting light;

[0009] The third optical interface is connected to the first optical interface and the second optical interface at four edges. The angle between the first optical interface and the third optical interface is α, and 60°≤α≤120°.

[0010] Furthermore, reflection dams of a certain height are arranged at intervals on the periphery of the third optical interface.

[0011] Further, it comprises the lens according to claim 1 or 2, wherein the lens is covered with a first light-emitting chip, and the light-emitting surface of the first light-emitting chip is tightly fitted with the first optical interface.

[0012] Furthermore, the wavelength of the first light-emitting chip is less than or equal to 600 nm.

[0013] Furthermore, it also includes two second light-emitting chips and a second lens covering the second light-emitting chips.

[0014] Furthermore, the third optical interface and the outer peripheries of the two second lenses are surrounded by continuous reflection dams.

[0015] Furthermore, the second lens is closely fitted to the light-emitting surface of the second light-emitting chip, and the second lens includes a fourth optical interface for outputting light, and the fourth optical interface is configured as a convex surface.

[0016] Furthermore, the second light-emitting chip is disposed below the center of curvature of the fourth optical interface.

[0017] Furthermore, the fourth optical interface is configured to have a plane or a slightly curved surface approaching a plane in the middle and curved surfaces on all sides, and the middle and all sides of the fourth optical interface are connected by smooth curved surfaces.

[0018] Furthermore, it also includes a substrate and a receiving portion provided on the substrate;

[0019] The first light emitting chip and the second light emitting chip are arranged on the substrate; the receiving portion at least covers the side surfaces of the first light emitting chip and the second light emitting chip, and the reflective dam is arranged on the inner side of the receiving portion.

[0020] Compared with the prior art, the lens provided by the present invention and the light source device using the lens have the following beneficial effects:

[0021] 1. The angle between the first optical interface and the third optical interface of the present invention is α, 60°≤α≤120°. The optical path diagram of the present invention refers to Figure 7 , the optical path diagram of the prior art refers to Figure 8The third optical interface of the present invention can deflect the edge large angle light toward the central optical axis, with high light energy utilization, more concentrated light energy, and small space occupation. The second optical interface is set as a plane or a micro-arc surface, and the overall structure is small in volume and easy to integrate.

[0022] 2. The light source device of the present invention integrates at least a first light-emitting chip and a second light-emitting chip. It is achieved that one light source device integrates multiple independent light-emitting units, and multiple independent light-emitting units can emit light of different colors or the same color, and the shapes of the light spots can be different or the same. The present invention is provided with a reflective dam, and the lens and the second lens are arranged at intervals from each other, as well as the lens, the second lens and the reflective dam are arranged at intervals, which fully ensures that the light-emitting units and the entire light source emit light independently to the outside without interference. The light source device of the present invention has a reasonable and simple structure, a small size, and a high degree of integration; it emits light in multiple colors, has strong functionality, stable light output, and low light interference; and has a high light energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a lens provided by the present invention;

[0024] Figure 2 is a cross-sectional view of a combination of a lens and a first light-emitting chip provided by the present invention;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the light source device provided by the present invention;

[0026] Figure 4 is a top view of the light source device provided by the present invention;

[0027] Figure 5 The present invention provides Figure 4 AA direction cross-sectional view of the light source device;

[0028] Figure 6 The present invention provides Figure 4 BB direction cross-sectional view of the light source device;

[0029] Figure 7 is a light path diagram of the lens and the first light emitting chip combination of the present invention;

[0030] Figure 8 It is a light path diagram of a combination of a lens and a first light-emitting chip in the prior art;

[0031] Fig. 9 1 is a light path schematic diagram of the prior art in which the incident light source C1, the incident light source D1 and the incident light source E1 are respectively arranged above the curvature center P, at the curvature center P and below the curvature center P of the light exit surface of the lens;

[0032] In the figure: 1-lens; 11-first optical interface; 12-second optical interface; 13-third optical interface; 2-second lens; 21-fourth optical interface; 3-first light-emitting chip; 4-second light-emitting chip; 5-substrate; 6-supporting part; 61-reflection dam. DETAILED DESCRIPTION

[0033] 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.

[0034] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0035] 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.

[0036] Reference Figure 1-7 The figure shows a preferred embodiment of the present invention.

[0037] Reference Figure 1 The lens 1 includes an inner surface, an outer surface and a side surface. The inner surface is a first optical interface 11 for inputting light, the outer surface is a second optical interface 12 for outputting light, and the side surface is a third optical interface 13. The first optical interface 11 is set as a plane, and the second optical interface 12 is set as a plane or a free-form surface. The third optical interface 13 is connected to the edges of the first optical interface 11 and the second optical interface 12. The angle between the first optical interface 11 and the third optical interface 13 is α, 60°≤α≤120°. For easy manufacturing and better light output effect, the angle α is preferably about 90°. In particular, the third optical interface 13 is preferably a plane or a free-form surface that is perpendicular or approximately perpendicular to the first optical interface 11.

[0038] Light enters the lens 1 from the first optical interface 11, is refracted, reaches the second optical interface 12, and then is refracted from the second optical interface 12 before being emitted. The angle between the third optical interface 13 and the first optical interface 11 is α, 60°≤α≤120°. The third optical interface 13 can refract or reflect the edge light with a large angle toward the direction close to the optical axis to achieve the effect of collecting the edge light. Compared with the prior art, the present invention has a high light energy utilization rate, more concentrated light energy, good light spot shaping effect, and a very small volume, which is easy to integrate. Figure 7-8 . Furthermore, the first optical interface 11 is preferably a plane or a slightly curved surface, which occupies less space and is easier to integrate optically. The angle between the first optical interface 11 and the third optical interface 13 is α, which satisfies 60°≤α≤120°, and will deflect the edge large-angle emitted light toward the direction close to the optical axis, avoiding light energy waste and greatly improving brightness. The invention has a compact structure, is easy to integrate, has relatively concentrated light output, high brightness and high light energy utilization.

[0039] Further, see Figure 5 The third optical interface 13 is provided with reflective dams 61 of a certain height at intervals on its periphery. The reflective dams 61 are made of high-reflective glue, which further redirects the light to a preset irradiation range, which is beneficial to optical shaping and light energy utilization.

[0040] The light source device comprises a lens 1, and the lens 1 is tightly covered with a first light emitting chip 3, referring to Figure 2 , Figure 5 The light emitting surface of the first light emitting chip 3 is closely attached to the first optical interface 11. The wavelength of the first light emitting chip 3 is preferably less than or equal to 600 nm. Figure 3-6 , the light source device also includes two second light-emitting chips 4 and second lenses 2 covering the two second light-emitting chips 4 respectively, that is, a light source device integrates three independently emitting light-emitting units. For example, it can be set that the first light-emitting chip 3 is a green light chip, and the two second light-emitting chips 4 are both red light chips or both infrared chips, or one is a red light chip and the other is an infrared chip. The single light source device of the present invention combines different light-emitting chips and is configured with lenses of different surface shapes to meet the needs of specific scenarios and has strong functionality.

[0041] The second lens 2 is closely fitted to the light-emitting surface of the second light-emitting chip 4. The second lens 2 includes a fourth optical interface 21 for outputting light, and the fourth optical interface 21 is set as a convex surface. The second light-emitting chip 4 is preferably arranged below the center of curvature of the fourth optical interface 21, and the input light will have a certain focusing effect after refraction, and the light collecting effect is better. Furthermore, the fourth optical interface 21 is set to be a plane or a micro-arc surface approaching a plane in the middle, and curved surfaces on all sides. The middle and all sides of the fourth optical interface 21 are connected by smooth curved surfaces. The surface setting of the second lens 2 enables the light source device to be small in size, high in light energy utilization, and easy to integrate.

[0042] Optimization scheme, the light source device also includes a substrate 5 and a receiving portion 6 arranged on the substrate 5, referring to Figure 6 . The first light-emitting chip 3 and the second light-emitting chip 4 are arranged on the substrate 5. The lens 1 and the second lens 2 tightly cover at least the light-emitting surfaces of the first light-emitting chip 3 and the second light-emitting chip 4 respectively. The side surfaces of the first light-emitting chip 3 and the second light-emitting chip 4 are covered by the receiving portion 6, and the lens 1 and the second lens 2 are distributed at intervals in the middle of the receiving portion 6. A continuous reflection dam 61 of a certain height is provided on the inner side of the receiving portion 6, and the reflection dam 61 is arranged at intervals on the periphery of the lens 1 and the second lens 2. The material of the receiving portion 6 is highly reflective glue. The reflection dam 61 is used to further reflect large-angle light at the edge, improve the utilization rate of light energy, ensure the edge contour shape of the light spot, do not cause light interference to other adjacent light sources, and are easy to integrate. The contour shape of the reflection dam 61 is preferably the same as or similar to the outer contour shape of the lens 1 and the second lens 2.

[0043] The spacing between the lens 1 and the second lens 2 and the spacing between the lens 1, the second lens 2 and the reflective dam 61 fully ensures that the multiple light sources integrated in the light source device and the entire light source device can independently emit light to the outside.

[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 lens, characterized in that: include: A first optical interface (11), which is arranged to be a plane and is used for inputting light; A second optical interface (12), which is configured as a plane or a free-form surface and is used to output light; A third optical interface (13) is connected to the first optical interface (11) and the second optical interface (12) at four edges, and the angle between the first optical interface (11) and the third optical interface (13) is α, 60°≤α≤120°.

2. The lens according to claim 1, wherein: Reflective dams (61) of a certain height are arranged at intervals on the periphery of the third optical interface (13).

3. A light source device, characterized in that: The lens comprises the lens according to claim 1 or 2, wherein the lens is covered with a first light-emitting chip (3), and the light-emitting surface of the first light-emitting chip (3) is tightly fitted to the first optical interface (11).

4. The light source device according to claim 3, characterized in that: The wavelength of the first light-emitting chip (3) is less than or equal to 600 nm.

5. The light source device according to claim 3, characterized in that: It also includes two second light-emitting chips (4) and a second lens (2) covering the second light-emitting chips (4).

6. The light source device according to claim 5, characterized in that: The third optical interface (13) and the outer peripheries of the two second lenses (2) are spaced apart and surrounded by a continuous reflective dam (61).

7. The light source device according to claim 6, characterized in that: The second lens (2) is tightly fitted to the light-emitting surface of the second light-emitting chip (4); the second lens (2) comprises a fourth optical interface (21) for outputting light; the fourth optical interface (21) is configured as a convex surface.

8. The light source device according to claim 7, characterized in that: The second light-emitting chip (4) is arranged below the center of curvature of the fourth optical interface (21).

9. The light source device according to claim 8, characterized in that: The fourth optical interface (21) is configured such that the middle portion is a plane or a slightly curved surface approaching a plane, and the surrounding portions are curved surfaces; the middle portion and the surrounding portions of the fourth optical interface (21) are connected via smooth curved surfaces.

10. The light source device according to claim 6, characterized in that: It also includes a base plate (5) and a receiving portion (6) provided on the base plate (5); The first light-emitting chip (3) and the second light-emitting chip (4) are arranged on the substrate (5); the receiving portion (6) at least covers the side surfaces of the first light-emitting chip (3) and the second light-emitting chip (4); and the reflective dam (61) is arranged on the inner side of the receiving portion (6).

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