Optical device
By setting the electrode leads parallel to the short axis of the optical lens, the imaging characteristics of the lens are used to solve the problem of dark areas of the spot stripes of the semiconductor optical chip, and high-quality spots and low-cost production are achieved.
Patent Information
- Application Number
- CN202420149659.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-22
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-22
AI Technical Summary
The electrode leads of existing semiconductor optical chips cause striped dark areas to appear on the spot, affecting the optical effect, and the existing solutions are complex and costly.
By setting the long axis of the electrode lead is parallel to the short axis of the optical lens, the optical lens has a small angle in the short axis direction, large curvature and small focal length, so that the electrode leads form a very thin real image at a distance to avoid dark stripes the formation of the zone.
It significantly improves the quality of the spot, simplifies the process flow and reduces production costs, and avoids the emergence of striped dark areas.
Smart Images
Figure CN222339930U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of semiconductor light emitting, and specifically relates to an optical device. Background Art
[0002] Several electrode leads are usually arranged inside the semiconductor optical chip. Figure 4 The electrode lead 11 is distributed in stripes in the semiconductor optical chip 1, and the long axis of the optical lens 2 is arranged parallel to the long axis direction of the electrode lead 11. Since the area where the electrode lead 11 is located does not emit light, the light spot 3 formed will present a striped dark area 31. Figure 5 , affecting the light spot effect and failing to meet the use requirements. The prior art generally adopts a method of setting a frosted layer on the optical interface of the optical lens 3 to increase diffuse reflection; or adding diffusion powder to the optical lens to increase the diffusion effect of light, so that the light around the stripe dark area 31 can be more irradiated to the stripe dark area 31. The prior art has the problems of complex production and high production cost.
[0003] Based on the above, the problem to be solved at present is: to provide an optical device with no obvious stripes or dark areas in the output light, simple to manufacture and low production cost. Utility Model Content
[0004] The utility model aims to provide an optical device, aiming to solve the problem in the prior art that the optical device causes a striped dark area to appear in the light spot due to the electrode lead.
[0005] The utility model is an optical device implemented in this way, comprising a light-emitting chip and an optical lens covering the light-emitting chip, wherein a plurality of electrode leads are arranged inside the light-emitting chip;
[0006] The projection of the optical lens on the upper surface of the light emitting chip includes a long axis and a short axis, and the long axis of the electrode lead is arranged parallel to the short axis of the projection of the optical lens on the upper surface of the light emitting chip.
[0007] Furthermore, the projection of the optical lens on the upper surface of the light emitting chip is rectangular or elliptical or a quasi-rectangular shape between a rectangle and an ellipse.
[0008] Furthermore, it also includes a substrate, the light emitting chip and the optical lens are arranged on the substrate, and the light emitting chip is packaged between the optical lens and the substrate.
[0009] Furthermore, the optical lens is a convex lens.
[0010] Compared with the prior art, the optical device provided by the utility model has the following beneficial effects:
[0011] The optical lens 2 has a small light distribution angle in the short axis direction, a large curvature, a steep cross-sectional curve, and a small focal length. Usually, the light emitting chip 1 is outside 1 times the focal length, so a real image is formed on the side of the optical lens 2 away from the light emitting chip 1. Figure 6 In the prior art, the long axis of the electrode lead 11 is parallel to the long axis of the optical lens 2. The width of the electrode lead 11 is magnified and widened by the optical lens 2 in the short axis direction and forms a real image in the distance, thus forming a wide and obvious striped dark area in the light field.
[0012] The optical lens 2 has a large angle light distribution in the long axis direction, a small curvature, a gentle cross-sectional curve, and a large focal length. Usually, the light emitting chip 1 is within 1 times the focal length. Figure 7 Therefore, a virtual image is formed on the same side of the optical lens 2 and the light-emitting chip 1, and there is no real focus on the side of the optical lens 2 far away from the light-emitting chip 1, and the light is emitted in a divergent manner.
[0013] According to the imaging principle, the long axis of the electrode lead 11 of the present invention is set perpendicular to the long axis of the optical lens 2, that is, parallel to the short axis of the projection of the optical lens 2 on the upper surface of the light-emitting chip 1. In this way, the length of the electrode lead 11 is stretched by the action of the short axis direction of the optical lens 2, but the width of the electrode lead 11 remains unchanged after the action of the long axis direction of the optical lens 2, and the width of the light-emitting chip is in the micron level. The real image of the electrode lead 11 in the distance is um-level - the extremely fine dark line is covered by the surrounding light, so there is no widening and obvious striped dark area in the distant light spot. Figure 3 The light spot quality of the utility model is greatly improved, and the process is simple and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a top view of the optical device provided by the utility model;
[0015] Figure 2 It is a top view of another optical device provided by the utility model;
[0016] Figure 3 It is a schematic diagram of the light spot of the optical device provided by the utility model;
[0017] Figure 4 is a top view of an optical device provided by the prior art;
[0018] Figure 5 is a schematic diagram of a light spot of an optical device in the prior art;
[0019] Figure 6 It is a schematic diagram of the refraction principle of the short axis direction of the optical lens;
[0020] Figure 7 It is a schematic diagram of the refraction principle of an optical lens in the long axis direction.
[0021] In the figure: 1-light-emitting chip; 11-electrode lead; 2-optical lens; 3-light spot; 31-striped dark area. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0023] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.
[0024] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present utility model, 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 utility model 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.
[0025] Reference Figure 1-7 As shown, it is a preferred embodiment provided by the utility model.
[0026] The optical device includes a light emitting chip 1 and an optical lens 2 covering the light emitting chip 1. The optical lens 2 is preferably a convex lens. The projection of the optical lens 2 on the upper surface of the light emitting chip 1 is set to be rectangular or elliptical or between rectangular and elliptical, and the light spot formed is rectangular or elliptical or between rectangular and elliptical. The projection of the optical lens 2 on the upper surface of the light emitting chip 1 includes a short axis and a long axis. Figure 1-2 A plurality of electrode leads 11 are arranged inside the light emitting chip 1, and the electrode leads 11 are striped. The electrode leads 11 can be arranged to be distributed in parallel in a plane parallel to the upper surface of the light emitting chip 1. The long axis of the electrode lead 11 is parallel to the short axis of the projection of the optical lens 2 on the upper surface of the light emitting chip 1.
[0027] The light distribution at a small angle in the short axis direction generally has a large curvature, a steep cross-sectional curve, and a small focal length. Usually, the light emitting chip 1 is at a position greater than 1 times the focal length, and a real image is formed on the side of the optical lens 2 away from the light emitting chip 1. The prior art usually sets the long axis of the striped electrode lead 11 to be parallel to the long axis of the optical lens 2. Figure 4The width of the working electrode lead 11 of the optical lens 2 in the short axis direction is set in this way to form a real image at a distance and be magnified and widened, that is, an obvious and wide stripe dark area, refer to Figure 5-6 . Reference Figure 7 , with a large angle of light distribution in the long axis direction, a small curvature, a gentle profile curve, and a large focal length. Usually, the light-emitting chip 1 is within 1 times the focal length, so an enlarged virtual image is formed on the same side of the optical lens 2 and the light-emitting chip 1, but there is no real focus on the side of the optical lens 2 away from the light-emitting chip 1 and the light is emitted in a divergent manner.
[0028] The long axis of the electrode lead 11 of the present invention is parallel to the short axis of the projection of the optical lens 2 on the upper surface of the light emitting chip 1. In this way, the length of the electrode lead 11 of the optical lens 2 in the short axis direction is elongated but the width remains unchanged, while the width of the light emitting chip is micrometer-level. The micrometer-level real image of the electrode lead 11 in the distance - a very fine dark line is covered by the surrounding light, so there is no stripe dark area in the distant light spot. Figure 3 .
[0029] Furthermore, the optical device further comprises a substrate. A light emitting chip 1 and an optical lens 2 are arranged on the substrate. The light emitting chip 1 is packaged between the optical lens 2 and the substrate.
[0030] This does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An optical device, characterized in that: It comprises a light-emitting chip (1) and an optical lens (2) covering the light-emitting chip (1), wherein a plurality of electrode leads (11) are arranged inside the light-emitting chip (1); The projection of the optical lens (2) on the upper surface of the light-emitting chip (1) comprises a long axis and a short axis, and the long axis of the electrode lead (11) is arranged parallel to the short axis of the projection of the optical lens (2) on the upper surface of the light-emitting chip (1).
2. The optical device according to claim 1, characterized in that The projection of the optical lens (2) on the upper surface of the light-emitting chip (1) is rectangular or elliptical, or a quasi-rectangular shape between a rectangle and an ellipse.
3. The optical device according to claim 1, characterized in that It also comprises a substrate, the light-emitting chip (1) and the optical lens (2) are arranged on the substrate, and the light-emitting chip (1) is packaged between the optical lens (2) and the substrate.
4. The optical device according to claim 1, characterized in that The optical lens (2) is a convex lens.