Multi-focus light source device

Abstract

The utility model relates to the technical field of semiconductor light emitting, and discloses a multi-focus light source device which comprises a substrate, a lens and a light emitting chip. The lens is arranged on the substrate, and a cavity structure is arranged between the lens and the substrate. The light-emitting chip is arranged on the substrate and in the cavity structure. The light-emitting chips at least comprise a first light-emitting chip and a second light-emitting chip. The lens is a convex lens, light emitted by the first light-emitting chip and light emitted by the second light-emitting chip are acted by the lens, a first focus area and a second focus area are formed on the side, away from the light-emitting chips, of the lens respectively, the image distances from the first focus area to the lens and from the second focus area to the lens are v1 and v2 respectively, and v1gt is met; v2. According to the utility model, at least two focus areas are arranged, and the double focus areas are staggered front and back. When the lens is heated to expand, the response area is located in the second focus area; when the lens is cooled and shrunk, the response area is located in the first focus area, the energy of the response area can meet the test requirement no matter how the temperature changes, and accurate test and high stability are achieved. The production process is simple, and the production cost is low.

Description

Technical Field

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

[0002] Reference for current market laser focused light source solutions Figure 6 A side-emitting EEL light-emitting chip 7 is fixed inside a copper tube 6, and a convex lens 3 is provided on one side of the copper tube 6. The light emitted by the EEL light-emitting chip 7 is converged by the lens 3 and converged into a focal area S on the side of the lens 3 away from the EEL light-emitting chip 7. A response area 5 is provided at the focal area S. The PD photosensitive chip of the application terminal receives the light energy of the response area 5 and converts it into an electrical signal for feedback. The existing technology uses a single-focus optical design, with the energy at the focal area S being the strongest and the energy before and after the focal area S being weak. The problem is that the optical lens is affected by temperature changes, its own refractive index changes, and it expands and contracts with heat and cold. These two factors will cause the focal area S to shift with temperature changes, that is, the high-temperature and low-temperature focal areas S will move forward and backward, and the energy in the response area 5 (test position) will be low, ultimately resulting in unstable or outright failure of the test at the application terminal. At the same time, the light source manufacturing process of the existing technology is complex and costly.

[0003] Based on the above, the current problem to be solved is to provide a multi-focus light source device that is accurate and stable in testing, simple to manufacture, and low in cost. Utility Model Content

[0004] The purpose of the present invention is to provide a multi-focus light source device, aiming to solve the problems in the prior art that a single-focus light source is affected by the temperature of the environment, has inaccurate testing and poor reliability, and has a complex production process and low production cost.

[0005] The utility model is implemented in this way: the multi-focus light source device includes:

[0006] substrate;

[0007] a lens disposed on the substrate, with a cavity structure provided between the lens and the substrate;

[0008] A light-emitting chip is provided on the substrate and in the cavity structure; the light-emitting chip includes at least a first light-emitting chip and a second light-emitting chip;

[0009] The lens is a convex lens, and the light emitted by the first light-emitting chip and the second light-emitting chip is converged by the lens to form a first focal area and a second focal area on the side of the lens away from the light-emitting chip, respectively. The image distances from the first focal area and the second focal area to the lens are v1 and v2, respectively, satisfying v1>v2.

[0010] Furthermore, the wavelengths of light emitted by the first light-emitting chip and the second light-emitting chip are the same, the thickness of the substrates are consistent, and the thickness of the first light-emitting chip is greater than that of the second light-emitting chip.

[0011] Furthermore, the wavelengths of light emitted by the first light-emitting chip and the second light-emitting chip are the same, the thickness of the first light-emitting chip is the same as the thickness of the second light-emitting chip, and the height of the substrate at the first light-emitting chip is greater than the height of the substrate at the second light-emitting chip.

[0012] Furthermore, the wavelengths of light emitted by the first light-emitting chip and the second light-emitting chip are the same; the thickness of the first light-emitting chip is greater than the thickness of the second light-emitting chip; and the height of the substrate at the first light-emitting chip is greater than the height of the substrate at the second light-emitting chip.

[0013] Furthermore, the wavelength of light emitted by the first light-emitting chip is greater than the wavelength of light emitted by the second light-emitting chip; the thickness of the first light-emitting chip is greater than or equal to the thickness of the second light-emitting chip; and the height of the substrate at the first light-emitting chip is greater than or equal to the height of the substrate at the second light-emitting chip.

[0014] Furthermore, the X-axis, Y-axis, and Z-axis are spatial rectangular coordinate axes, the X-axis and the Y-axis are parallel to two adjacent right-angled sides of the substrate, and the Z-axis is parallel to the center line of the lens;

[0015] The first focal area and the second focal area are respectively arranged on both sides of the center line of the lens;

[0016] A response area for light energy testing is provided between the first focal area and the second focal area.

[0017] Furthermore, the first light-emitting chip and the second light-emitting chip are arranged along a parallel X-axis, and a line connecting the projections of the center of the first focal area and the center of the second focal area on the planes where the Y-axis and the Z-axis are located is approximately parallel to the Z-axis;

[0018] Alternatively, the first light-emitting chip and the second light-emitting chip are arranged along the parallel Y axis, and the line connecting the projections of the center of the first focal area and the center of the second focal area on the planes where the X axis and the Z axis are located is approximately parallel to the Z axis.

[0019] Furthermore, the lens includes an optical functional area in the middle and connecting parts around it, and the connecting parts are used to support the optical functional area and connect the substrate.

[0020] Furthermore, the lens is a plano-convex lens, a concave-convex lens, or a biconvex lens.

[0021] Furthermore, the lens is configured as a biconvex lens, and the optical functional area includes a lower optical interface for inputting light and an upper optical interface for outputting light; the curvature of the upper optical interface is greater than the curvature of the lower optical interface.

[0022] Compared with the prior art, the light emitting device provided by the present invention has the following beneficial effects:

[0023] The present invention provides at least two focal zones, with the first focal zone S1 and the second focal zone S2 not coplanar and offset from each other. The response zone 5 is positioned between the first and second focal zones S1 and S2. When the lens 3 expands due to heat, the first and second focal zones S1 and S2 shift away from the lens 3 as a whole. The response zone 5 is positioned at the second focal zone S2, and the terminal detects the light energy from the second focal zone S2. When the lens 3 contracts due to cooling, the first and second focal zones S1 and S2 shift toward the lens 3 as a whole. The response zone 5 is positioned at the first focal zone S1, and the terminal detects the light energy from the first focal zone S1. This ensures that the energy in the response zone 5 (test position) meets the test requirements regardless of temperature fluctuations, achieving precise and stable testing.

[0024] Compared with the prior art, the present invention does not need to use the copper tube 6, the optical functional area 31 and the connecting portion 32 are integrally formed, the lens 3 is glued and fixed to the substrate 1, the production process is simple, and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional structural diagram and optical path diagram of the multi-focus light source device of Example 1 provided by the utility model;

[0026] Figure 2 This is a cross-sectional structural diagram and optical path diagram of the multi-focus light source device of Example 2 provided by the utility model;

[0027] Figure 3 This is a cross-sectional structural diagram and optical path diagram of the multi-focus light source device of Example 4 provided by the utility model;

[0028] Figure 4 yes Figure 2 The cross-sectional structure diagram and optical path diagram of the multi-focus light source device in the plane where the Y axis and Z axis are located;

[0029] Figure 5 This is a top view of the multi-focus light source device provided by the utility model;

[0030] Figure 6 It is a cross-sectional structure diagram and optical path diagram of a laser focusing light source provided by the prior art;

[0031] In the figure: 1-substrate; 2-light-emitting chip; 21-first light-emitting chip; 22-second light-emitting chip; 3-lens; 31-optical functional area; 32-connecting part; 4-cavity structure; 5-response area; 6-copper tube; 7-EEL light-emitting chip; S-focal area; S1-first focal area; S2-second focal area. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to 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 with reference to 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 this utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 limiting 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 1-6 The figure shows a preferred embodiment of the present invention.

[0036] The multi-focus light source device includes: a substrate 1, a lens 3 and a light-emitting chip 2, referring to Figure 1 . The lens 3 is provided on the substrate 1, and a cavity structure 4 is provided between the lens 3 and the substrate 1. The bottom of the cavity structure 4 is used to accommodate the light-emitting chip 2, and the upper part is used for light propagation. The light-emitting chip 2 is provided on the substrate 1 and in the cavity structure 4. The light-emitting chip 2 includes at least a first light-emitting chip 21 and a second light-emitting chip 22. Preferably, the first light-emitting chip 21 and the second light-emitting chip 22 are respectively provided on both sides of the center line of the lens 3. Furthermore, the optical axes of the first light-emitting chip 21 and the second light-emitting chip 22 are parallel to the center line of the lens 3.

[0037] The lens 3 is configured as a convex lens with a converging effect. The lens 3 can be a plano-convex lens, a concave-convex lens, or a biconvex lens. The lens 3 includes an optical functional area 31 in the middle and connecting parts 32 on all sides. The connecting part 32 is used to support the optical functional area 31, and the bottom of the connecting part 32 is connected to the substrate 1. The optical functional area 31 and the connecting part 32 can be configured to be integrally formed. In a preferred embodiment, the lens 3 is configured as a biconvex lens, and the optical functional area 31 includes a lower optical interface for input light and an upper optical interface for output light. After the output light of the light-emitting chip 2 enters the cavity structure 4, it first enters the lens 3 through the refraction of the lower optical interface, and then exits after being refracted by the upper optical interface. Preferably, the curvature of the upper optical interface is greater than the curvature of the lower optical interface.

[0038] Compared with the prior art, the present invention does not need to use the copper tube 6, the optical functional area 31 and the connecting portion 32 are integrally formed, and the lens 3 is directly connected to the substrate 1, which has low production cost and simple process.

[0039] The light emitted by the first light-emitting chip 21 and the second light-emitting chip 22 is converged into a first focal area S1 and a second focal area S2 on the side of the lens 3 away from the light-emitting chip 2, respectively, through the action of the lens 3. The image distances from the first focal area S1 and the second focal area S2 to the lens 3 are v1 and v2, respectively, satisfying v1>v2, that is, the first focal area S1 is farther away from the lens 3 than the second focal area S2. A response area 5 is also provided between the first focal area S1 and the second focal area S2. The PD photosensitive chip of the application terminal can detect the energy of the response area 5 and provide feedback. The response area 5 is preferably located in the middle of the first focal area S1 and the second focal area S2, that is, at a distance of v1 / 2+v2 / 2 from the lens 3.

[0040] The present invention provides at least two focal zones, and the first focal zone S1 and the second focal zone S2 are not in the same plane. The first focal zone S1 and the second focal zone S2 are offset front to back, and the response zone 5 is located between the first focal zone S1 and the second focal zone S2. When the lens 3 is heated and expands, the first focal zone S1 and the second focal zone S2 are offset as a whole away from the lens 3, and the response zone 5 is exactly at the position of the second focal zone S2. When the lens is cooled and contracts, the first focal zone S1 and the second focal zone S2 are offset as a whole towards the lens 3, and the test position of the response zone 5 is exactly at the position of the first focal zone S1. In this way, no matter how the temperature changes, the test position energy can meet the test requirements, achieving accurate and stable testing.

[0041] To facilitate explanation of the preferred solution, the X-axis, Y-axis, and Z-axis are defined as spatial rectangular coordinate axes. The X-axis and Y-axis are respectively parallel to two adjacent right-angled sides of the substrate 1 , and the Z-axis is parallel to the center line of the lens 3 .

[0042] The first focal area S1 and the second focal area S2 are respectively arranged on both sides of the center line of the lens 3. When the first light emitting chip 21 and the second light emitting chip 22 are arranged along the parallel X axis, Figure 5 The optical axes of the first light emitting chip 21 and the second light emitting chip 22 are parallel to the Z axis. The line connecting the center of the first focal area S1 and the center of the second focal area S2 on the plane where the Y axis and the Z axis are located is approximately parallel to the Z axis. Figure 4 .

[0043] When the first light-emitting chip 21 and the second light-emitting chip 22 are arranged along the parallel Y axis, the optical axes of the first light-emitting chip 21 and the second light-emitting chip 22 are parallel to the Z axis, and the line connecting the center of the first focal area S1 and the center of the second focal area S2 on the plane where the X axis and the Z axis are located is approximately parallel to the Z axis.

[0044] In order to form different image distances v1 and v2 in the Z-axis direction, it is necessary to have different object distances u1 and u2 between the first light-emitting chip 21, the second light-emitting chip 22 and the lens 3. The preferred specific embodiments are as follows:

[0045] Example 1: Reference Figure 1 , the wavelength of light emitted by the first light emitting chip 21 and the second light emitting chip 22 is the same, the height of the substrate 1 is consistent, the thickness of the first light emitting chip 21 is greater than the thickness of the second light emitting chip 22, that is, the object distances u1 and u2 from the first light emitting chip 21 and the second light emitting chip 22 to the lens 3 satisfy u1<u2、vI> v2.

[0046] Example 2: Reference Figure 2 , the wavelength of light emitted by the first light emitting chip 21 and the second light emitting chip 22 is the same, and the thickness of the first light emitting chip 21 is the same as the thickness of the second light emitting chip 22. The bottom heights of the substrate 1 are different, and the height of the substrate 1 where the first light emitting chip 21 is located is greater than the height of the substrate 1 where the second light emitting chip 22 is located, that is, the object distances u1 and u2 from the first light emitting chip 21 and the second light emitting chip 22 to the lens 3 satisfy u1<u2、vI> v2.

[0047] Example 3: The main difference from Example 2 is that the thickness of the first light emitting chip 21 is greater than the thickness of the second light emitting chip 22. Other implementations are the same as Example 2, and u1 is also implemented.<u2、vI> v2.

[0048] Example 4: Reference Figure 3The wavelength of light emitted by the first light-emitting chip 21 is greater than the wavelength of light emitted by the second light-emitting chip 22, the thickness of the first light-emitting chip 21 is greater than or equal to the thickness of the second light-emitting chip 22, the height of the substrate 1 at the first light-emitting chip 21 is greater than or equal to the height of the substrate 1 at the second light-emitting chip 22, and the object distances u1 and u2 from the first light-emitting chip 21 and the second light-emitting chip 22 to the lens 3 satisfy u1≤u2 and vI>v2 (under the same conditions, the longer the wavelength, the longer the focal length).

[0049] This does not limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-focus light source device, characterized in that: include: base(1); A lens (3) is provided on the substrate (1), and a cavity structure (4) is provided between the lens (3) and the substrate (1); A light-emitting chip (2) is provided on the substrate (1) and in the cavity structure (4); the light-emitting chip (2) comprises at least a first light-emitting chip (21) and a second light-emitting chip (22); The lens (3) is a convex lens. Light emitted by the first light-emitting chip (21) and the second light-emitting chip (22) is converged by the lens (3), and a first focal area (S1) and a second focal area (S2) are respectively formed on a side of the lens (3) away from the light-emitting chip (2). The image distances from the first focal area (S1) and the second focal area (S2) to the lens (3) are v1 and v2, respectively, satisfying v1>v2.

2. The multi-focus light source device according to claim 1, characterized in that: The wavelengths of light emitted by the first light-emitting chip (21) and the second light-emitting chip (22) are the same, the thickness of the substrate (1) is consistent, and the thickness of the first light-emitting chip (21) is greater than the thickness of the second light-emitting chip (22).

3. The multi-focus light source device according to claim 1, characterized in that: The wavelengths of light emitted by the first light-emitting chip (21) and the second light-emitting chip (22) are the same, the thickness of the first light-emitting chip (21) is the same as the thickness of the second light-emitting chip (22), and the height of the substrate (1) at the first light-emitting chip (21) is greater than the height of the substrate (1) at the second light-emitting chip (22).

4. The multi-focus light source device according to claim 1, characterized in that: The wavelengths of light emitted by the first light-emitting chip (21) and the second light-emitting chip (22) are the same; the thickness of the first light-emitting chip (21) is greater than the thickness of the second light-emitting chip (22); and the height of the substrate (1) at the first light-emitting chip (21) is greater than the height of the substrate (1) at the second light-emitting chip (22).

5. The multi-focus light source device according to claim 1, characterized in that: The wavelength of light emitted by the first light-emitting chip (21) is greater than the wavelength of light emitted by the second light-emitting chip (22); the thickness of the first light-emitting chip (21) is greater than or equal to the thickness of the second light-emitting chip (22); and the height of the substrate (1) at the first light-emitting chip (21) is greater than or equal to the height of the substrate (1) at the second light-emitting chip (22).

6. The multi-focus light source device according to claim 1, characterized in that: The X-axis, the Y-axis, and the Z-axis are spatial rectangular coordinate axes, the X-axis and the Y-axis are respectively parallel to two adjacent right-angled sides of the substrate (1), and the Z-axis is parallel to the center line of the lens (3); The first focal area (S1) and the second focal area (S2) are respectively arranged on both sides of the center line of the lens (3); A response area (5) for light energy testing is provided between the first focal area (S1) and the second focal area (S2).

7. The multi-focus light source device according to claim 6, characterized in that: The first light-emitting chip (21) and the second light-emitting chip (22) are arranged along a parallel X-axis, and a line connecting the projections of the center of the first focal area (S1) and the center of the second focal area (S2) on the planes where the Y-axis and the Z-axis are located is approximately parallel to the Z-axis; Alternatively, the first light-emitting chip (21) and the second light-emitting chip (22) are arranged along a parallel Y axis, and a line connecting the projections of the center of the first focal area (S1) and the center of the second focal area (S2) on the planes where the X axis and the Z axis are located is approximately parallel to the Z axis.

8. The multi-focus light source device according to claim 1, characterized in that: The lens (3) comprises an optical functional area (31) in the middle and connecting parts (32) around the periphery, wherein the connecting parts (32) are used to support the optical functional area (31) and to connect the substrate (1).

9. The multi-focus light source device according to claim 1, characterized in that: The lens (3) is a plano-convex lens, a concave-convex lens, or a biconvex lens.

10. The multi-focus light source device according to claim 8, characterized in that: The lens (3) is configured as a biconvex lens, and the optical functional area (31) comprises a lower optical interface for inputting light and an upper optical interface for outputting light; the curvature of the upper optical interface is greater than the curvature of the lower optical interface.

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