CN107654856B - UV-LED light source - Google Patents
UV-LED light source Download PDFInfo
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- CN107654856B CN107654856B CN201710859276.9A CN201710859276A CN107654856B CN 107654856 B CN107654856 B CN 107654856B CN 201710859276 A CN201710859276 A CN 201710859276A CN 107654856 B CN107654856 B CN 107654856B
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- curved surface
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- light source
- heat dissipation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Led Device Packages (AREA)
Abstract
The invention relates to a UV-LED light source, comprising: the top of the machine shell is provided with a top cover module extending to the inside, and the top cover module consists of a lens bracket and a semi-cylindrical lens; the casing comprises from top to bottom: the COB module comprises an aluminum nitride ceramic substrate, a UV-LED chip and a hemispherical lens; the heat dissipation module is used for carrying out heat exchange; the fan module comprises a plurality of fans which are arranged in parallel, and a gap is formed between the upper end surface of each fan and the lower end surface of the heat dissipation module; the air channel module comprises a first curved surface, a second curved surface and a third curved surface, and the first curved surface, the second curved surface and the third curved surface form a splayed air channel; the bottom of the machine shell is provided with an aerial plug connected with an external cable. The invention has the beneficial effects that: the problems of ink absorption of the lamp body, poor contact of the joint and insufficient optical power of the lamp holder are solved.
Description
Technical Field
The invention relates to the technical field of ultraviolet curing of inkjet printers, in particular to a UV-LED light source.
Background
The UV-LED market and applications in recent years have shown a rapidly growing situation. Compared with mercury lamps, the UV-LED has the advantages of lower energy consumption, longer service life, no toxicity and environmental protection, ensures the assistance of policies such as public policy, electricity saving and preferential benefit, continuously increases the replacement of the UV-LED on the mercury lamps, and is increasingly diversified in application. Currently, the photo-curing market occupies 80% of the market share of UV-LED applications, including applications such as painting, printing, exposure, coating, etc.
The UV lamp for spray painting needs to be manufactured into an air-cooled UV-LED light source with compact structure and high integration level. However, the popularization of the air-cooled UV-LED light source in the current market in the application field is not smooth, and there are three main limiting factors, namely (1) damage to the lamp head due to ink absorption of the lamp body, (2) frequent contact failure due to dragging of the cable joint by a drag chain, and (3) the requirement of three-dimensional spray painting on the optical power density of the lamp head cannot be met.
The most serious of the three factors is the ink absorption problem of the lamp body. Specifically, the most core structure of the inkjet printer is an inkjet trolley, two sides of the inkjet trolley are used for mounting UV-LED light sources, and the middle of the inkjet trolley is used for mounting an ink nozzle. In the spray painting process, the trolley continuously moves, the spray head accurately sprays the printing ink with different colors according to the control of a computer, and the lighted UV-LED solidifies the printing ink in real time to form the required spray painting pattern. In the process of ejecting the ink by the nozzle, the trolley always moves to generate gas turbulence, so that the ink can float around the trolley. Ink in the atmosphere of the UV-LED light source can be sucked into the lamp cap from an air inlet of the air channel, and the sucked ink can be directly attached to the surfaces of the fan and the radiating fins due to the fact that the existing lamp body is designed to be the straight-through air channel. Ink accumulated on the surface of the fan can lead to the failure of the fan, so that an air cooling mechanism fails, and finally the lamp cap is damaged due to overheating. Ink buildup on the heat sink surface can cause a reduction in the heat sink heat dissipation efficiency and can also cause the lamp head temperature to rise, thereby affecting lamp head reliability.
A second problem is that poor contact of the cap cable connector frequently occurs in practical applications. In the existing UV-LED light source, a control circuit board is integrated in a lamp body, and a cable for external control and power supply is electrically connected with a lamp holder circuit board through a wire-to-board terminal. The cable can produce the tensile stress to the terminal junction along with the tow chain back-and-forth movement in the air brushing process, because the line is to the board terminal connection of plugging, so the terminal junction is very easily appeared contact failure under long-time effect of dragging. In addition, the wire-to-board terminals are made of plastic, and after ink is attached to the terminals, the plastic terminals are corroded, so that the pressing force for inserting the terminals is insufficient, and the poor contact condition of the cable plug is further aggravated. The lamp holder cable contact is bad, and the lamp holder is abnormally extinguished or abnormally twinkling in the spray painting process, so that the image which needs to be solidified is not solidified, and waste products are directly reported.
The third problem is that the light power density of the lamp holder is insufficient, and the requirement of three-dimensional spray painting cannot be met. The three-dimensional spray painting and the plane spray painting are relative concepts and are based on a leading edge trend of the plane spray painting. The planar spray painting means that the sprayed and painted image is thin in thickness, the image is mainly formed by tiling of printing ink of different colors, the three-dimensional spray painting means that the sprayed and painted image has specific concave-convex fluctuation in thickness, the image is formed by the color of the printing ink and the concave-convex together, and the image is more vivid. The ink jet amount of the ink in the three-dimensional spray painting is increased (the larger the ink jet amount is, the thicker the ink layer is, the higher the required illumination of the light source is, the light source is used for penetrating through the whole ink layer), and a large amount of white ink is needed for priming (the lowest penetration coefficient of the white ink is, the same ink layer thickness is, the lower the penetration coefficient is, the higher the required illumination of the light source is, the light source is used for penetrating through the whole ink layer), so that the three-dimensional effect of the spray painting pattern. The existing UV-LED lamp for spray painting is usually 4-5W/cm2The illumination of the ink jet printing head is not enough to meet the requirement of three-dimensional jet printing, and the whole thick ink layer cannot be completely cured, so that the adhesion of the ink is insufficient and the residual smell of the ink is very large.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a UV-LED light source and solves three problems of the existing UV-LED light source applied to spray painting.
The technical scheme for solving the technical problems is as follows: a UV-LED light source comprising:
the top cover module extends to the inside of the machine shell, the top cover module consists of a lens support and a semi-cylindrical lens, the periphery of the lens support is the same as that of the top of the machine shell, a groove body extending along the length direction is arranged at one third of the middle part of the lens support, and the semi-cylindrical lens is embedded in the groove body;
the casing comprises from top to bottom:
the COB module comprises an aluminum nitride ceramic substrate, UV-LED chips and hemispherical lenses, wherein the UV-LED chips are uniformly distributed on the upper end face of the aluminum nitride ceramic substrate, and each UV-LED chip is provided with one hemispherical lens;
the heat dissipation module is used for carrying out heat exchange and comprises a supporting part arranged above and a heat dissipation tooth part connected to the lower end face of the supporting part; a groove for accommodating the COB module is formed in the upper end face of the supporting part, and the side face of the supporting part is attached to the inner wall of the shell;
the fan module comprises a plurality of fans which are arranged in parallel, and a gap is formed between the upper end surface of each fan and the lower end surface of each heat dissipation tooth part;
the air duct module comprises a first curved surface, a second curved surface and a third curved surface, wherein the first curved surface extends rightwards from the left side wall of the shell by a certain radian for a certain distance, the second curved surface extends leftwards from the right side wall of the shell by the same radian for a certain distance, the first curved surface and the second curved surface are symmetrical about the central axis of the shell, the third curved surface is arranged below the first curved surface and the second curved surface and bends downwards from the middle to two sides, the left end and the right end of the third curved surface are respectively close to the left side and the right side of the shell, the distance between the two ends of the third curved surface and the inner wall of the shell is the same, and the first curved surface, the second curved surface and the third curved surface form an 'eight' -shaped air duct;
the bottom of the machine shell is provided with a first through hole, and the lower end of the first through hole is provided with an aerial plug connected with an external cable.
The invention has the beneficial effects that: the problems of ink absorption of the lamp body, poor contact of the joint and insufficient optical power of the lamp holder are solved.
Drawings
FIG. 1 is a schematic diagram of a UV-LED light source according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, a UV-LED light source includes a casing, a top cover module 1 extending to the inside is disposed on the top of the casing, and the inside of the casing sequentially includes a COB module 2, a heat dissipation module 3, a fan module 4, and an air duct module 5 from top to bottom; the bottom of the machine shell is provided with a first through hole 6, and the lower end of the first through hole 6 is provided with an aerial plug 7 connected with an external cable.
The top cover module 1 is composed of a lens support 10 and a semi-cylindrical lens 11, wherein the periphery of the lens support 10 is the same as the periphery of the top of the casing, a groove 12 extending along the length direction is arranged at the middle third of the lens support 10, and the semi-cylindrical lens 11 is embedded in the groove 12.
The upper and lower end faces of the semi-cylindrical lens 11 are plated with antireflection films.
The COB module 2 includes an aluminum nitride ceramic substrate 20, a UV-LED chip 21, and a hemispherical lens 22. The UV-LED chips 21 are electrically connected with the bonding pads on the aluminum nitride ceramic substrate 20 through solder paste and gold wires, the UV-LED chips 21 are uniformly distributed on the aluminum nitride ceramic substrate 20, and each UV-LED chip 21 is covered with a hemispherical lens 22. Both faces of each hemispherical lens 22 are coated with an antireflection film.
Further, the UV-LED chips 21 have three rows, and each row includes 18 UV-LED chips.
Preferably, the power supply of the COB module 2 is a pulse signal, the pulse frequency is 1KHz, and the duty ratio is 50%.
Preferably, the UV-LED chip 21 is a Taiwan optical macro-technology corporation model BN-U4545R-A3 InGaN chip, the light emitting area is 1.14 mm long and 1.14 mm wide, and the light emitting wavelength has a wavelength band of 365 nm, 385 nm, 395 nm and 405 nm.
Preferably, the hemispherical lens 22 has a diameter of 3 mm and is made of an optical glass having a Ducheng photoelectricity company Limited number K9.
The heat radiation module 3 is used for heat exchange, and includes a support portion 30 provided above and a heat radiation tooth portion connected to a lower end surface of the support portion. The upper end surface of the supporting part is provided with a groove for arranging the COB module, and good heat conduction is formed between the COB module 2 and the heat dissipation module 3 through the contact of the COB module and the heat dissipation module; and the side of the supporting part is a plane and is tightly attached to the shell to form good heat conduction. Heat dissipation module 3 can give whole casing with COB module 2's heat transfer, has expanded total heat radiating area by a wide margin.
The fan module 4 is disposed below the heat dissipation module 3 and includes a plurality of fans 41 arranged side by side. The upper end face of the fan and the lower end face of the heat dissipation tooth part have a certain gap, and the size of the gap is half of the thickness 41 of the fan.
Preferably, at least three fans 41 are provided.
As shown in fig. 1, the air duct module 5 is disposed below the fan module 4, and includes a first curved surface 51, a second curved surface 52 and a third curved surface 53, wherein the first curved surface 51 extends to the right at a certain radian a from the left sidewall of the housing, the second curved surface 52 extends to the left at a certain radian a from the right sidewall of the housing, and the first curved surface 51 and the second curved surface 52 are symmetrical about the central axis of the housing. The third curved surface 53 is disposed below the first curved surface 51 and the second curved surface 52 and extends from the middle to two sides in a downward bending manner, the left and right ends of the third curved surface 53 are respectively close to the left and right sides of the housing, and the distance between the two ends of the third curved surface and the inner wall of the housing is the same. An inverted V-shaped air duct is formed among the first curved surface, the second curved surface and the third curved surface.
The widths of the first, second and third curved surfaces 51, 52 and 53 are the same as the inner width of the casing; the air duct module 5 realizes the air inlet from two sides and the air outlet from the middle.
Preferably, sponges for absorbing ink particles are disposed on the lower end surfaces of the first, second, and third curved surfaces 51, 52, and 53.
A plurality of strip-shaped air inlets 61 are formed in two sides of the lower end face of the shell; and the air inlet 61 and the first through hole 6 do not interfere with each other.
The open surface of the casing is provided with a casing panel 8. The chassis panel 8 is provided with a rectangular second through hole 81, and the second through hole 81 is used as an air outlet of the light source.
During the use, the air that contains printing ink can get into wind channel module 5 after the air intake 61 through the casing mainboard. The air current can form the rotatory backward flow of air current at the "splayed" root of wind channel module 5, and the printing ink molecule is because liquid, can deposit in backward flow department, and pure gas can follow "splayed" top outflow wind channel module 5 after the wind pressure accumulation to a certain extent to the effect of "ink separation" has been realized. The printing ink is actively accumulated in the air duct module 5, so that the accumulation of the printing ink on a fan and a heat dissipation tooth of a heat dissipation core element is greatly reduced, and the service life of a light source is prolonged.
The heat dissipation module 3 is in close contact with the whole casing, so that the casing is brought into the whole heat dissipation system, and the total surface area for heat dissipation is expanded. Because the light source can move along with the trolley, namely the shell and the air can form relative movement at a certain speed, a large amount of heat can be emitted from the surface of the shell, the pressure of a traditional heat radiation system formed by the heat radiation tooth part inside the cavity of the light source and the fan 41 is weakened, the overall temperature of the light source is further reduced, and the service life of the light source is further prolonged.
The secondary optical lens that half-round lens 22 of COB module 2 and half-cylindrical lens 11 of protecgulum module 1 are constituteed can draw the outside of light source with the light of chip almost all, provides the total energy of light-emitting and peak illuminance as high as possible. In addition, because the power supply of the COB module 2 is a pulse signal, when the peak value of the pulse signal is twice that of the conventional constant signal, the total power consumed by the light source is unchanged, but the peak intensity of the transient state is doubled.
The light source realizes that the peak illumination is 2.5 times of that of the traditional light source through the secondary optical design and the control of the pulse signal, and can easily meet the requirement of the thickness of the ink for three-dimensional spray painting.
Compared with the traditional line pair board terminal, the aviation plug 7 on the lower end face of the shell can firmly connect the cable and the aviation plug through the locking bolt on one hand, and avoids the vicious phenomenon of frequent and bad electrical contact of the existing light source; on the other hand, because the aviation plug surface is a metal protection piece, the influence of ink adhesion on the electrical performance of the connector is not worried about.
After the whole light source is assembled, all parts visible from the outside are bright silver surfaces of aluminum profiles after anodic oxidation and fine sand blasting, and the traditional light source is a metal bent sheet metal part, and parts such as a fan, a cable and the like in the lamp body can be seen due to the straight-through air channel. The light source of the invention has beautiful design and high-grade atmosphere and visual sense.
In conclusion, the invention solves the three technical problems of the existing spray painting application of the UV-LED light source.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A UV-LED light source, comprising:
the top cover module extends to the inside of the machine shell, the top cover module consists of a lens support and a semi-cylindrical lens, the periphery of the lens support is the same as that of the top of the machine shell, a groove body extending along the length direction is arranged at one third of the middle part of the lens support, and the semi-cylindrical lens is embedded in the groove body;
the casing comprises from top to bottom:
the COB module comprises an aluminum nitride ceramic substrate, UV-LED chips and hemispherical lenses, wherein the UV-LED chips are uniformly distributed on the upper end face of the aluminum nitride ceramic substrate, and each UV-LED chip is provided with one hemispherical lens;
the heat dissipation module is used for carrying out heat exchange and comprises a supporting part arranged above and a heat dissipation tooth part connected to the lower end face of the supporting part; the upper end face of the supporting part is provided with a groove for accommodating the COB module, good heat conduction is formed between the COB module and the heat dissipation module through the contact of the COB module and the heat dissipation module, and the side face of the supporting part is attached to the inner wall of the shell;
the fan module comprises a plurality of fans which are arranged in parallel, and a gap is formed between the upper end surface of each fan and the lower end surface of each heat dissipation tooth part;
the air duct module comprises a first curved surface, a second curved surface and a third curved surface, wherein the first curved surface extends rightwards from the left side wall of the shell by a certain radian for a certain distance, the second curved surface extends leftwards from the right side wall of the shell by the same radian for a certain distance, the first curved surface and the second curved surface are symmetrical about the central axis of the shell, the third curved surface is arranged below the first curved surface and the second curved surface and bends downwards from the middle to two sides, the left end and the right end of the third curved surface are respectively close to the left side and the right side of the shell, the distance between the two ends of the third curved surface and the inner wall of the shell is the same, and the first curved surface, the second curved surface and the third curved surface form an 'eight' -shaped air duct; a left air inlet gap and a right air inlet gap are formed between the left end and the right end of the third curved surface and the inner wall of the shell, a plurality of strip-shaped air inlets are arranged on two sides of the lower end surface of the shell, and the air inlet on one side of the lower end surface of the shell corresponds to the left air inlet gap, and the air inlet on the other side of the lower end surface of the shell corresponds to the right air inlet gap;
the bottom of the machine shell is provided with a first through hole, and the lower end of the first through hole is provided with an aerial plug connected with an external cable.
2. The UV-LED light source of claim 1, wherein the upper and lower end surfaces of the semi-cylindrical lens and each of the semi-spherical lenses are coated with antireflection coatings.
3. The UV-LED light source of claim 2, wherein the COB module comprises three rows of 18 UV-LED chips.
4. The UV-LED light source of claim 3, wherein the COB module is powered by a pulse signal with a pulse frequency of 1KHz and a duty cycle of 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710859276.9A CN107654856B (en) | 2017-09-21 | 2017-09-21 | UV-LED light source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710859276.9A CN107654856B (en) | 2017-09-21 | 2017-09-21 | UV-LED light source |
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| CN107654856A CN107654856A (en) | 2018-02-02 |
| CN107654856B true CN107654856B (en) | 2020-05-01 |
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| CN201710859276.9A Active CN107654856B (en) | 2017-09-21 | 2017-09-21 | UV-LED light source |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108692228A (en) * | 2018-05-29 | 2018-10-23 | 芜湖徽福电子科技有限公司 | A kind of ultra-violet curing light source convenient for adjusting |
| CN108995354A (en) * | 2018-08-08 | 2018-12-14 | 深圳市瑞丰光电紫光技术有限公司 | A kind of offset printing curing light source structure and printing machine |
| CN110124964B (en) * | 2019-04-09 | 2022-04-26 | 武汉优炜星科技有限公司 | UV-LED light source |
| CN113370678B (en) * | 2021-06-01 | 2022-07-12 | 深圳市源铭科技有限公司 | High-strength LED-UV lamp bead module |
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| CN107654856A (en) | 2018-02-02 |
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Address after: No. 5, 6, 10, 11, 12, 13, 14, 15, 5th Floor, R&D Building, No. 1, Modern Service Industry Base, Science and Technology Park, Huazhong University of Science and Technology, No. 13, Daxueyuan Road, East Lake New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee after: Wuhan Youweixin Technology Co., Ltd. Address before: 5th Floor, R&D Building/Unit 1, Huazhong University of Science and Technology Science Park Modern Service Industry Base, No. 13, Daxueyuan Road, East Lake New Technology Development Zone, Wuhan City, Hubei Province, 430075 Patentee before: WUHAN UV LEDTEK Co.,Ltd. |
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