CN210272416U

CN210272416U - Inorganic ultraviolet LED device

Info

Publication number: CN210272416U
Application number: CN201921071039.7U
Authority: CN
Inventors: 卢汉光; 李宗涛; 汤勇; 曹凯; 饶龙石; 王弘; 丁鑫锐
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-04-07
Anticipated expiration: 2029-07-10

Abstract

The utility model provides an inorganic ultraviolet LED device, includes support, curved surface lens, clamping ring, wire and ultraviolet chip, open on the support has "T" font recess, the ultraviolet chip is fixed in the recess, the ultraviolet chip passes through the wire and is connected with the welded layer of support lower extreme, curved surface lens is placed on the step of recess, the step is polished with curved surface lens's contact surface and is had the inclined plane, the one end and the leg joint of clamping ring, the other end of clamping ring compresses tightly curved surface lens. The deformation of the pressure ring is realized under the pressure action of the pressure head, so that the device is combined in a high strength manner, the self-positioning is completed by utilizing the curvature of the curved surface of the lens and the contact of the inclined surface of the bracket, the fixation of the lens is completed in such a manner, and the combination strength is high and the stability is good; meanwhile, organic materials such as glue are prevented from being used, decomposition of the organic materials by ultraviolet light is prevented, and the service life of the ultraviolet LED device is prolonged.

Description

Inorganic ultraviolet LED device

Technical Field

The utility model relates to an optical device makes the field, concretely relates to inorganic ultraviolet LED device.

Background

The light-emitting of ultraviolet LED chip is similar to lambert's distribution, the light intensity distributes according to the cosine law promptly, can not directly be applied to the illumination, need secondary optical structure to distribute like control light such as curved lens, traditional LED device curved lens's is fixed, realize through the assembly of clamping ring and lens cone, and need add organic material bonding lens such as glue, but the ultraviolet ray can lead to the fact to decompose ageing to organic material, thereby reduce bonding effect and influence device life-span, and the lens kind is many, surface curvature variation range is big, the fixed mode precision of clamping ring and lens cone is low, poor stability, cause the skew dislocation of lens easily, the uneven also easily leads to its surface damage of atress of lens, influence the light distribution of device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of above prior art existence, provide an inorganic ultraviolet LED device, the utility model discloses can solve traditional lens and use glue easily ageing, the problem at the bottom of the precision is low and stable.

The purpose of the utility model can be realized by the following technical scheme:

the utility model provides an inorganic ultraviolet LED device, includes support, curved surface lens, clamping ring, wire and ultraviolet chip, open on the support has "T" font recess, the ultraviolet chip is fixed in the recess, the ultraviolet chip passes through the wire and is connected with the welded layer of support lower extreme, curved surface lens is placed on the step of recess, the step is polished with curved surface lens's contact surface and is had the inclined plane, the clamping ring be fixed in curved surface lens and support upper end. The deformation of the pressure ring is realized under the pressure action of the pressure head, so that the device is combined in a high strength manner, the self-positioning is completed by utilizing the curvature of the curved surface of the lens and the contact of the inclined surface of the bracket, the fixation of the lens is completed in such a manner, and the combination strength is high and the stability is good; meanwhile, organic materials such as glue are prevented from being used, decomposition of the organic materials by ultraviolet light is prevented, and the service life of the ultraviolet LED device is prolonged.

Preferably, the inclination of the inclined plane is 30-45 °.

Preferably, the side edge of the curved lens is roughened by grinding with metal sand. The bonding strength of the pressure ring and the lens is improved through coarsening. Preferably, the lower curved surface of the curved lens is a free-form curved surface, and the lens can be better in contact with the inclined surface of the support to complete self-positioning of the lens.

Preferably, the contact surface of the support and the pressure ring is coated with a zinc-aluminum coating, the zinc-aluminum coating and the aluminum alloy ring are welded under the pressure action of the annular pressure head, and the zinc-aluminum welding fixture is high in bonding strength and good in stability.

Preferably, the material of the pressing ring is 1 series aluminum alloy. The aluminum alloy has good plasticity and ductility, is easy to process, and the surface of the aluminum alloy can realize intermolecular bonding with other metals under the pressure action of a pressure head to complete high-strength welding, so that the aluminum alloy is suitable for being used for fixing and mounting curved lenses.

A preparation method of an inorganic ultraviolet LED device comprises the following steps:

1) degreasing the contact surface of the support and the compression ring by using a degreasing agent, uniformly coating a zinc-aluminum coating solution, and then placing the support and the compression ring into an oven for pre-baking and sintering;

2) fixing the ultraviolet chip in the groove of the bracket, and welding the ultraviolet chip with the welding layer of the bracket by using a lead;

3) grinding and coarsening the side edge of the curved lens by using carborundum, placing the curved lens right above the ultraviolet chip, and completing self-positioning of the curved lens through contact between the lower curved surface of the curved lens and the inclined plane of the bracket;

4) and placing the pressing ring between the lens and the support, and applying longitudinal pressure to the pressing ring under certain frequency through the annular pressing head to deform the pressing ring to obtain a shape matched with the side surface and the upper curved surface of the curved lens.

Preferably, the coating thickness of the zinc-aluminum coating liquid in the step 1) is 25-75 μm, the pre-drying temperature is 70-95 ℃, the pre-drying time is 7-10 min, the sintering temperature is 150-200 ℃, and the sintering time is 40-70 min.

Preferably, the carborundum mesh number is 10-20, the grinding speed is 5-15 m/min, and the grinding pressure is 1.5-3 kg/cm²。

Preferably, the outer diameter of the annular pressure head is 0.1-0.2 mm smaller than the outer diameter of the metal ring before deformation, the pressure of the pressure head is 15-20 MPa, the stroke of the pressure head is 15-30 mm, and the pressure maintaining time is 1.0-2.5 s.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model realizes the deformation of the compression ring through the pressure effect to combine the device with high strength, and completes the self-positioning by utilizing the curvature of the curved surface of the lens and the contact of the inclined plane of the bracket, thus completing the fixation of the lens, and having high combination strength and good stability; meanwhile, organic materials such as glue are prevented from being used, decomposition of the organic materials by ultraviolet light is prevented, and the service life of the ultraviolet LED device is prolonged.

2. The utility model discloses utilize the pressure head of aluminum alloy to warp the installation fixed course of accomplishing lens, the curved surface matching degree of aluminum alloy and lens is high, avoids the problem of lens dislocation.

3. The utility model discloses a support presintering one deck zinc-aluminum alloy coating accomplishes the welding with the aluminum alloy ring under the pressure effect of cyclic annular pressure head, and bonding strength is high, and stability is good.

Drawings

Fig. 1 is a schematic structural diagram of an inorganic ultraviolet LED device according to the present invention;

fig. 2 is a schematic structural view of the bracket of the present invention;

fig. 3 is a partially enlarged view of a portion a in fig. 2;

fig. 4 is a schematic structural diagram of the curved lens of the present invention;

fig. 5 is a partially enlarged view of a portion B in fig. 4;

FIG. 6 is a schematic view of a die bonding wire in step 2 of the preparation method of the present invention;

FIG. 7 is a schematic view of the manufacturing method of the present invention with a lens placed in step 3;

FIG. 8 is a schematic view of the compression ring placed in step 4 of the manufacturing method of the present invention;

FIG. 9 is a schematic view of the pressure deformation of the pressure ring in step 4 of the manufacturing method of the present invention;

fig. 10 is a schematic structural view in embodiment 5 of the present invention;

wherein, 1 is lens, 2 is the clamping ring, 3 is the support, 31 is the recess, 4 is the ultraviolet chip, 5 is the wire, 6 is the welding layer, 7 is the contact surface of support and clamping ring, 8 is the side of curved surface lens, 9 is metal baffle.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Example 1

As shown in fig. 1 and 2, an inorganic ultraviolet LED device comprises a support 3, a curved lens 1, a press ring 2 and an ultraviolet chip 4, a groove 31 shaped like a 'T' is formed in the upper end of the support 3, the ultraviolet chip 4 is fixed in the groove 31, the ultraviolet chip 4 is connected with a welding layer 6 of the lower end of the support 3 through a wire 5, the curved lens 1 is placed on a step of the groove 31, an inclined plane is polished on the contact surface of the step and the curved lens 1, one end of the press ring 2 is connected with the support 3, and the other end of the press ring 2 compresses the curved lens 1. The compression ring 2 is deformed under the pressure action of the pressure head, so that the device is combined in a high-strength manner, the self-positioning is completed by utilizing the contact between the curvature of the curved surface of the curved lens 1 and the inclined surface of the bracket 3, the fixation of the curved lens 1 is completed in such a way, and the device is high in combination strength and good in stability; meanwhile, organic materials such as glue are prevented from being used, decomposition of the organic materials by ultraviolet light is prevented, and the service life of the ultraviolet LED device is prolonged.

The slope of the inclined plane is 30 degrees.

As shown in fig. 4 and 5, the side edges of the curved lens are roughened by metal sand grinding, and the bonding strength between the press ring and the lens is improved by the roughening. The lower curved surface of the curved lens 1 is a free curved surface, and can be in contact with the inclined surface of the support 3 better to complete self-positioning of the lens.

As shown in fig. 3, the contact surface of the bracket 3 and the pressure ring 2 is coated with a zinc-aluminum coating. The zinc-aluminum coating and the aluminum alloy pressure ring are welded under the pressure action of the annular pressure head, and the zinc-aluminum coating and the aluminum alloy pressure ring are high in bonding strength and good in stability.

The material of the pressing ring 2 is 1 series aluminum alloy.

As shown in fig. 6 to 9, a method for manufacturing an inorganic ultraviolet LED device includes the following steps:

1) degreasing the contact surface 7 of the bracket 3 and the compression ring 2 by using a degreasing agent, uniformly coating zinc-aluminum coating liquid with the thickness of 55 mu m, placing the mixture into an oven at 80 ℃ for pre-baking for 8min, and then placing the mixture into an oven at 185 ℃ for sintering for 60 min;

2) fixing the ultraviolet chip 4 in the groove 31 of the bracket, and simultaneously welding the ultraviolet chip 4 with the welding layer 6 of the bracket 3 by using a lead 5; 3) grinding and coarsening the side edge 8 of the curved lens 1 by using carborundum, wherein the grinding speed and the grinding pressure are respectively 10m/min and 2.1kg/cm²Placing the curved lens 1 right above the ultraviolet chip 4, and completing self-positioning of the lens through contact between the lower curved surface of the curved lens 1 and the inclined surface of the bracket 3;

4) placing a press ring 2 between the lens 1 and the support 3, applying longitudinal pressure to the press ring 2 under certain frequency by an annular pressure head to deform the press ring 2 to obtain a shape matched with the side surface and the upper curved surface of the curved lens 1, wherein the outer diameter of the annular pressure head is 0.15mm smaller than that of the press ring before deformation, the pressure of the pressure head is 16MPa, the pressure head is formed to be 20mm, and the pressure maintaining time is 1.5s

Example 2

The present example is the same as example 1 except for the following technical features:

grinding and coarsening the side edge 8 of the lens in the step 2), coating a zinc-aluminum coating liquid with the thickness of 40 mu m, pre-baking for 10min at the temperature of 95 ℃, and sintering for 70min at the temperature of 200 ℃ to finish the sintering of the zinc-aluminum alloy coating on the side edge of the lens.

Example 3

The present example is the same as example 2 except for the following technical features:

in the step 4), the annular pressure head is changed into an ultrasonic welding head with the vibration frequency of 18kHz, so that the bonding strength of the aluminum alloy can be improved.

Example 4

The present example is the same as example 3 except for the following technical features:

and 3) after the compression ring deforms, grinding the upper surface of the support to remove the excessive aluminum alloy flowing to the outer side of the support.

Example 5

The present example is the same as example 4 except for the following technical features:

as shown in fig. 10, in step 3), after the side edge 8 of the curved lens 1 is ground and roughened, a metal baffle plate 9 is placed at the upper end of the pressing ring position to prevent the metal from overflowing after the pressing ring is deformed, the diameter of the inner ring of the metal baffle plate is 0.15mm larger than the outer diameter of the metal ring before deformation, and the metal baffle plate is removed after the metal ring is deformed in step S4.

The above-mentioned specific implementation is the preferred embodiment of the present invention, can not be right the utility model discloses the limit, any other does not deviate from the technical scheme of the utility model and the change or other equivalent replacement modes of doing all contain within the scope of protection of the utility model.

Claims

1. The utility model provides an inorganic ultraviolet LED device, its characterized in that, includes support, curved lens, clamping ring, wire and ultraviolet chip, open the support upper end has "T" font recess, the ultraviolet chip is fixed in the recess, the ultraviolet chip passes through the wire and is connected with the welded layer of support lower extreme, curved lens places on the step of recess, the step is polished with curved lens's contact surface and is had the inclined plane, the clamping ring be fixed in curved lens and support upper end.

2. The inorganic ultraviolet LED device of claim 1, wherein the slope of the inclined plane is 30 ° to 45 °.

3. The inorganic ultraviolet LED device of claim 1, wherein the side of the curved lens is roughened by metal sand grinding.

4. The inorganic ultraviolet LED device of claim 1, wherein the lower curved surface of the curved lens is a free-form surface.

5. The inorganic ultraviolet LED device as recited in claim 1, wherein the contact surface of the support and the pressure ring is coated with a zinc-aluminum coating.

6. The inorganic ultraviolet LED device as claimed in claim 1, wherein the material of the pressure ring is 1 series aluminum alloy.