Photosensitive device

Abstract

The utility model relates to the technical field of semiconductor luminescence, and discloses a photosensitive device. The photosensitive device comprises a support, a photosensitive chip and an optical lens. The photosensitive chip is arranged on the support. The optical lens is arranged on the support and covers the photosensitive chip. The optical lens comprises an optical function part, and the optical function part is a convex lens capable of converging external light to the photosensitive area of the photosensitive chip. A cavity structure is arranged between the optical lens and the photosensitive chip. The optical function area of the optical lens is the convex lens with the convergence function, external light rays are converged to the photosensitive area of the photosensitive chip through the optical function area, light spots formed in the convergence area are small, the area of the photosensitive area of the photosensitive chip needed for receiving light energy is small, and therefore the size of the needed photosensitive chip is small, and the size of the needed photosensitive chip is small. The production cost is greatly saved; and meanwhile, the light receiving effect is good, the light energy utilization rate is high, and high precision and quick response of the photosensitive device are further realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of semiconductor light emitting, and in particular relates to a photosensitive device. Background Art

[0002] Photosensitive devices include photosensitive semiconductor chips, which have photosensitive areas for emitting or receiving light and can convert light into electrical signals. They are often used in light detection, photoelectric reaction, image recognition and other fields. With the rapid development of optoelectronic technology, higher requirements are placed on the photoelectric parameters of photosensitive packaged devices, such as responsiveness, response time and reliability. Figure 3 A photosensitive chip 2 is arranged on the bracket 1, and the photosensitive chip 2 is tightly covered with an optical lens 3 (or a light-transmitting adhesive layer), and the optical lens 3 (or the light-transmitting adhesive layer) is also coated with a gold wire 4. In order to improve the sensitivity of the photosensitive device, light energy needs to be fully sensed by the photosensitive area of ​​the photosensitive chip 2. Generally, the size of the photosensitive chip 2 is large, and the cost of a large-sized photosensitive chip 2 is high.

[0003] Based on the above, the problem to be solved at present is: to provide a photosensitive device with high light energy receiving rate, high sensitivity, small photosensitive chip size and low production cost. Utility Model Content

[0004] The utility model aims to provide a photosensitive device, aiming to solve the problems in the prior art that the photosensitive device has a low light energy receiving rate, low sensitivity, a large photosensitive chip size and a high production cost.

[0005] The utility model is a photosensitive device implemented in this way, comprising:

[0006] Bracket;

[0007] Photosensitive chip: it is arranged on the bracket;

[0008] An optical lens is arranged on the bracket and covers the photosensitive chip; the optical lens includes an optical functional part, which is a convex lens capable of converging external light to the photosensitive area of ​​the photosensitive chip; a cavity structure is provided between the optical lens and the photosensitive chip.

[0009] Furthermore, the optical lens is a biconvex lens, a plano-convex lens, or a concave-convex lens.

[0010] Furthermore, the optical lens is a Fresnel lens.

[0011] Furthermore, it also includes a gold wire for electrically connecting the bracket and the photosensitive chip.

[0012] Furthermore, the optical lens also includes a connecting portion for connecting to the bracket, and the connecting portion is arranged around the optical functional portion.

[0013] Compared with the prior art, the photosensitive device provided by the utility model has the following beneficial effects:

[0014] The optical functional area of ​​the optical lens of the utility model is set as a convex lens with a converging function. External light is converged to the photosensitive area of ​​the photosensitive chip through the optical functional area. The light spot formed in the converging area is small, and the photosensitive area area of ​​the photosensitive chip required to receive light energy is small, so the required size of the photosensitive chip is small. Figure 1-2 ) and the prior art photosensitive device (refer to Figure 3 ) Compared with conventional optical fiber ...

[0015] The optical lens may be a Fresnel lens. When external light is focused on the photosensitive area of ​​the photosensitive chip, the thickness of the optical lens is greatly reduced, and the volume of the photosensitive device is reduced, which is convenient for optical integrated design. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the photosensitive device provided by the utility model;

[0017] Figure 2 It is a schematic cross-sectional structure diagram of another photosensitive device provided by the utility model;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of a photosensitive device in the prior art.

[0019] In the figure: 1- bracket; 2- photosensitive chip; 3- optical lens; 31- optical functional part; 32- connecting part; 4- gold wire; 5- cavity structure. DETAILED DESCRIPTION

[0020] 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.

[0021] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0022] 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.

[0023] Reference Figure 1-2 As shown, it is a preferred embodiment provided by the utility model.

[0024] Reference Figure 1 , the photosensitive device includes a bracket 1, a photosensitive chip 2 and an optical lens 3. The bracket 1 is provided with a photosensitive chip 2. The optical lens 3 is provided on the bracket 1 and covers the photosensitive chip 2. The photosensitive chip 2 is encapsulated between the bracket 1 and the optical lens 3. The optical lens 3 includes a functional part 31. The optical functional part 31 is a convex lens, and the optical functional part 31 can converge external light to the photosensitive area of ​​the photosensitive chip 2. A cavity structure 5 is provided between the optical lens 3 and the photosensitive chip 2. The cavity structure 5 is used for light propagation. The utility model can converge external light to the photosensitive area of ​​the photosensitive chip 2 and receive it by setting the optical functional part 31 of the optical lens 3 as a convex lens. The area of ​​the spot after convergence is small, and the photosensitive area of ​​the photosensitive chip 2 required to receive the light is small, so the size of the photosensitive chip 2 required is small. At the same time, the converged light can be fully received by the photosensitive chip 2, so that the utility model can achieve high accuracy and rapid response. The optical lens 3 can be set as a double convex lens, a plano-convex lens, or a concave-convex lens.

[0025] In order to further reduce the size of the photosensitive device, refer to Figure 2 The optical lens 3 is preferably a Fresnel lens, which can greatly reduce the thickness of the optical lens 3, so that the photosensitive device of the utility model has a small volume and is convenient for optical integrated design.

[0026] Furthermore, the optical lens 3 also includes a connecting portion 32. The connecting portion 32 is connected to the periphery of the optical functional portion 31. The bottom surface of the connecting portion 32 is fixedly connected to the bracket 1, so that the photosensitive chip 2 is encapsulated in the optical lens 3. The photosensitive device for connecting the bracket 1 also includes a gold wire 4 for electrically connecting the bracket 1 and the photosensitive chip 2.

[0027] 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. A photosensitive device, characterized in that: include: Bracket (1); A photosensitive chip (2): which is arranged on the support (1); An optical lens (3) is arranged on the support (1) and covers the photosensitive chip (2); the optical lens (3) comprises an optical functional portion (31), the optical functional portion (31) being a convex lens capable of converging external light onto a photosensitive area of ​​the photosensitive chip (2); and a cavity structure (5) is provided between the optical lens (3) and the photosensitive chip (2).

2. The photosensitive device according to claim 1, characterized in that The optical lens (3) is a biconvex lens, a plano-convex lens, or a concave-convex lens.

3. The photosensitive device according to claim 1 or 2, characterized in that: The optical lens (3) is a Fresnel lens.

4. The photosensitive device according to claim 1, characterized in that It also includes a gold wire (4) for electrically connecting the bracket (1) and the photosensitive chip (2).

5. The photosensitive device according to claim 1, characterized in that: The optical lens (3) further comprises a connecting portion (32) for connecting to the bracket (1), wherein the connecting portion (32) is arranged around the optical function portion (31).

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