CN202794849U

CN202794849U - Even surface light source device for exposure machine

Info

Publication number: CN202794849U
Application number: CN2012204330717U
Authority: CN
Inventors: 霍永峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-29
Filing date: 2012-08-29
Publication date: 2013-03-13
Anticipated expiration: 2022-08-29

Abstract

The utility model relates to an even surface light source device for an exposure machine. The even surface light source device comprises a welding circuit board arranged below a radiator; a plurality of LED lamps are arranged on the welding circuit board; lens are arranged on the LED lamps; the exit surfaces of the lens are formed by assembling a plurality of curved surfaces; the edges of the curved surfaces are polygonal; and the edges of every two adjacent curved surfaces are parallel or overlapped. Light emitted by the LED lamps passes through the plurality of curved surfaces of the exit surfaces of the lens to form primary sub spots which are roughly square; and in an illuminating field, these primary sub spots overlapped together to form square secondary sub spots, wherein the centers of the secondary sub-spots are even, the edge illuminance is slowly changed, and the illumination evenness is better.

Description

A kind of uniform surface light source device for exposure machine

Technical field

The utility model relates to a kind of uniform surface light source device for exposure machine, and particularly a kind of LED lamp that adopts is as the uniform surface light source device that is used for exposure machine of light source.

Background technology

The uniform surface light source device that is used for exposure machine that is used for now the wiring board production run adopts mercury lamp to add a simple reflector to expose as light source usually, but because the ultraviolet light efficiency of mercury lamp is very low, for the luminous energy density that reaches exposure just needs High-power Mercury-vapor Lamp, its thermal value is large, and needs larger heat radiation power; Simultaneously, switch life is limited can not frequently to be opened and closed, and in the period of non-exposure, mercury lamp also must be worked after therefore starting shooting, and energy consumption is larger, and main is that the light-emitting area of mercury lamp commonly used is larger, is difficult to the energy distribution on the illuminated field is even.

Because advancing by leaps and bounds of LED technology in recent years, especially ultraviolet LED is encapsulated in the rapid progress that obtains on the light efficiency, the ultraviolet LED package application has become possibility to the wiring board exposure machine now, and present some producer is used for the LED package application uniform surface light source device of exposure machine to wiring board, it is disclosed content in 200920308298.7 the Chinese utility model patent " PCB exposure machine " such as application number, utilize the LED lamp to the exposure of pcb board direct irradiation, it has the following disadvantages:

1, LED encapsulation is generally wide-angle luminescence, and optical processing is not made in existing LED encapsulation, and the illumination patterns lack of homogeneity on pcb board is shone in the LED encapsulation, and light fails to shine fully on pcb board, causes the luminous energy waste;

2, in the prior art only with the LED welded encapsulation in same plane, and relies on and air-cooled LED encapsulation is dispelled the heat, and higher its life-span of led chip junction temperature is shorter, after the long-term practicality, the weak point that average life is short, light decay is large.

The utility model content

Goal of the invention of the present utility model is: for the problem that prior art exists, provide a kind of illumination uniformity better to be used for the uniform surface light source device of exposure machine.

To achieve these goals, the technical solution adopted in the utility model is: a kind of uniform surface light source device for exposure machine, comprise the welding wiring board that is arranged at the heating radiator below, be provided with several LED lamps on the described welding wiring board, be provided with lens on the described LED lamp, the exit facet of described lens is formed by several surface joinings, and the edge of described curved surface is polygon, and adjacent edge is parallel or overlap between adjacent two curved surfaces.

Need to prove that in the utility model, the LED lamp or the LED that adopt for wiring board production exposure are encapsulated as ultraviolet LED lamp or ultraviolet LED encapsulation.

The edge of the curved surface on the described lens exit facet is rectangular or square.

Described LED lamp comprises LED encapsulation and the heat-radiating substrate that the LED encapsulation is installed, described LED encapsulation inside is provided with the LED luminescence chip, described LED luminescence chip is rectangular, the edge of described LED luminescence chip on exit facet projection and the angle at the edge of curved surface be 30 °～60 °.

Described several curved surfaces form rectangular array at exit facet.

Be fixedly connected with support on the described welding wiring board, described lens are fixed on the welding wiring board by support, and described lens and support all are arrayed along the direction of curved edges at the welding wiring board.

Be provided with cooling line in the described heating radiator, described cooling line is connected with liquid chiller, and the water side of described liquid chiller and water inlet end are communicated with water inlet end and the water side of cooling line respectively.

All be coated with cooling line in the heating radiator above each LED lamp.

Described several LED lamps are rectangular arrayed in the welding wiring board, and described cooling line length and width direction along the rectangular array of LED lamp in heating radiator is full of twists and turns.

Flow direction is opposite in the interior two adjacent row cooling lines of described heating radiator.

The water inlet end of described cooling line and water side are positioned on the two adjacent row cooling lines of heating radiator, and the water inlet end of cooling line and water side are positioned at the same side of heating radiator.

In sum, owing to adopted technique scheme, the beneficial effects of the utility model are: the light that the LED lamp sends forms a roughly second son hot spot of quadrate by several curved surfaces that are arranged at the lens exit facet at illuminated field, thereby these second son hot spots mutually superpose and form the two second son hot spots that have a rectangular shape that the center is even, edge illumination slowly changes at illuminated field, and illumination uniformity is better.

Description of drawings

Fig. 1 is the side view of LED lamp in the utility model;

Fig. 2 is the front elevation of LED lamp in the utility model;

Fig. 3 is the synoptic diagram of lens exit facet mean camber in the utility model;

Fig. 4 is the front elevation that is used for the uniform surface light source device of exposure machine in the utility model;

Fig. 5 is that the structure of the utility model uniform surface light source device of being used for exposure machine is partly cutd open synoptic diagram;

Fig. 6 is the front elevation that uses after LED lamp and the lens arrangement in the utility model;

Fig. 7 is the synoptic diagram of the flow path of liquid coolant in cooling line in the utility model.

Mark among the figure: welding wiring board-220, LED lamp-230, heat-radiating substrate-310, LED encapsulation-320, LED luminescence chip-410, curved surface-510, lens-720, support-730, cooling line-711, the projection of the edge of LED luminescence chip on exit facet and the angle-810 at the edge of curved surface, the flow path-110 of liquid coolant in cooling line.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

Embodiment 1

Extremely shown in Figure 7 such as Fig. 1, the uniform surface light source device that present embodiment is used for exposure machine comprises the welding wiring board 220 that is arranged at heating radiator 710 belows, be provided with several LED lamps 230 on the described welding wiring board 220, LED lamp 230 comprises LED encapsulation 320 and the heat-radiating substrate 310 that LED encapsulation 320 is installed, described LED encapsulates 320 inside and is provided with LED luminescence chip 410, described LED luminescence chip 410 is rectangular, be provided with lens 720 on the described LED lamp 230, the quantity of lens 720 and position are corresponding one by one with quantity and the position of LED lamp 230, lens 720 are fixed on the welding wiring board 220 by support 730, support 730 is fixedly connected on the welding wiring board 220, lens 720 cassettes are connected between support 730 and the welding wiring board 220, be that lens 720 hang on the support 730 and to realize that the location is fastening, described lens 720 and support 730 all are arrayed along the direction at curved surface 510 edges welding wiring board 220.

The exit facet of described lens 720 is spliced by several curved surfaces 510, the face shape parameter of each curved surface 510 is identical, in the present embodiment, the edge of each curved surface 510 all has a rectangular shape, edge adjacent between adjacent two curved surfaces 510 is parallel, so that several curved surfaces 510 piece together at the exit facet of lens 720 by adjacent edge is as a whole, several LED lamps 230, lens 720, support 730, be parallel to each other along the edge that the edge direction of curved surface 510 is evenly arranged into the curved surface 510 of array and adjacent lens; Adopt such structure, the light that LED lamp 230 sends forms a roughly second son hot spot of quadrate by several curved surfaces 510 that are arranged at lens 720 exit facets at illuminated field, thereby these adjacent second son hot spots mutually superpose and form the two second son hot spots that have a rectangular shape that the center is even, edge illumination slowly changes at illuminated field, and illumination uniformity is better.

In the present embodiment, the edge of described LED luminescence chip 410 on the projection on the exit facet of lens 720 and curved surface 510 with it the angle at adjacent edge be 45 °, that is: the direction at an edge of the exit facet top-surface camber 510 of lens 720, led light source chip 410 edges the angle projection lens exit facet between corresponding with it is 45 °, adopt such structure, can remedy the aberration that curved surface 510 causes when forming a second son hot spot, thereby two second son hot spots of formation splice mutually and can splice more uniform two second son hot spots at illuminated field and form uniform area source like this.In other embodiments, the edge of each curved surface 510 can also be triangle, hexagon etc., just repeats no more at this.

Embodiment 2

Extremely shown in Figure 7 such as Fig. 1, present embodiment be used for exposure machine uniform surface light source device several curved surfaces 510 exit facet along welding wiring board 220 laterally and vertical evenly distributed formation rectangular array, simultaneously, each LED lamp 230 corresponding lens 720 laterally and are vertically also arranged rectangular array in welding on the wiring board 220, adopt such structure, two second son hot spots are along the direction at square curved surface 510 edges, vertical with laterally mutual intersect and the marginal portion overlapping, be spliced to form more uniform area source at illuminated field like this, each LED luminescence chip 410 is square.In the present embodiment, the edge of described LED luminescence chip 410 on the projection on the exit facet and curved surface 510 with it the angle at adjacent edge be 60 °, adopt such structure, can remedy the aberration that curved surface 510 causes when forming a second son hot spot, the two second son hot spots that form like this can splice more uniformly area source at illuminated field, in addition, in the present embodiment, the neighboring edge between two adjacent curved surfaces 510 overlaps conllinear.

All the other structures see also embodiment 1.

Embodiment 3

Extremely shown in Figure 7 such as Fig. 1, present embodiment is used for the uniform surface light source device of exposure machine, the cooling line 711 of liquid coolant is provided with in the described heating radiator 710 to circulate, described cooling line 711 is connected with liquid chiller, the water side of described liquid chiller and water inlet end are communicated with water inlet end and the water side of cooling line 711 respectively, consist of the liquid cooling closed circuit, in order to guarantee that each LED lamp 230 is evenly cooled off, the heating radiator 710 interior cooling lines 711 that all are coated with of the top of each LED lamp 230, be that the flow path 110 of liquid coolant in cooling line covers each LED lamp 230, so that the coolant flow cooling is all arranged near each LED lamp 230 in the perform region, guarantee that each LED lamp 230 all carries out efficiently radiates heat.

For the radiating effect that further makes each LED lamp 230 more even, described cooling line 711 is interior along the length of several LED lamps 230 at the rectangular array of welding wiring board 220 formation at heating radiator 710, cross direction is full of twists and turns, the water inlet end of cooling line 711 and water side are positioned on the two adjacent row cooling lines 711 of heating radiator 710, and the water inlet end of cooling line 711 and water side are positioned at the same side of heating radiator 710, adopt such structure, liquid coolant can fully flow through be arranged in each LED lamp 230 in the heating radiator 710 near, flow direction is opposite in the described heating radiator 710 interior two adjacent row cooling lines 711, and water inlet end and water side almost are arranged on same position, be different from the mode that it is divided into heating radiator 710 both sides, near in the perform region any one regional area cooling liquid temperature difference is less, thereby homogeneity and the consistance of each LED lamp 230 heat radiations on the heating radiator 710 have been guaranteed, more be of value to the serviceable life that prolongs LED lamp 230, improve the heat radiation situation of each part.

In the present embodiment, the main path of cooling line 711 extends along the length direction of LED lamp 230 at the rectangular array of welding wiring board 220 formation, be after liquid coolant is flowed through whole length direction along cooling line 711, the broad ways bending is flowed to next length direction along its length again, and on length direction and Width, liquid coolant in the adjacent two row cooling lines 711 flows to opposite, so repeatedly until cooling line 711 prolongs and rectangular array in each LED lamp 230.Thereby further guaranteed homogeneity and the consistance of each LED lamp 230 heat radiations on the welding wiring board 220, more be of value to the serviceable life that prolongs LED lamp 230, improved the heat radiation situation of each part.

In the present embodiment, the edge of described LED luminescence chip 410 on the projection on the exit facet of lens 720 and curved surface 510 with it the angle at adjacent edge be 30 °, that is: the direction at an edge of the exit facet top-surface camber 510 of lens 720, led light source chip 410 edges the angle projection lens exit facet between corresponding with it is 30 °, adopt such structure, can remedy the aberration that curved surface 510 causes when forming a second son hot spot, thereby two second son hot spots of formation splice mutually and can splice more uniform two second son hot spots at illuminated field and form uniform area source like this.

The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. uniform surface light source device that is used for exposure machine, comprise the welding wiring board (220) that is arranged at heating radiator (710) below, be provided with several LED lamps (230) on the described welding wiring board (220), it is characterized in that: be provided with lens (720) on the described LED lamp (230), the exit facet of described lens (720) is spliced by several curved surfaces (510), the edge of described curved surface (510) is polygon, and adjacent edge is parallel or overlap between adjacent two curved surfaces (510).

2. the uniform surface light source device for exposure machine according to claim 1, it is characterized in that: the edge of the curved surface (510) on described lens (720) exit facet is rectangular or square.

3. the uniform surface light source device for exposure machine according to claim 2, it is characterized in that: described LED lamp (230) comprises LED encapsulation (320) and the heat-radiating substrate (310) that LED encapsulation (320) is installed, described LED encapsulation (320) inside is provided with LED luminescence chip (410), described LED luminescence chip (410) is rectangular, the edge of described LED luminescence chip (410) on exit facet projection and the angle (810) at the edge of curved surface be 30 °～60 °.

4. arbitrary described uniform surface light source device for exposure machine in 3 according to claim 1, it is characterized in that: described several curved surfaces (510) form rectangular array at exit facet.

5. arbitrary described uniform surface light source device for exposure machine in 3 according to claim 1, it is characterized in that: be fixedly connected with support (730) on the described welding wiring board (220), described lens (720) are fixed on the welding wiring board (220) by support (730), and described lens (720) and support (730) all are arrayed along the direction at curved surface (510) edge at welding wiring board (220).

6. arbitrary described uniform surface light source device for exposure machine in 3 according to claim 1, it is characterized in that: be provided with cooling line (711) in the described heating radiator (710), described cooling line (711) is connected with liquid chiller, and the water side of described liquid chiller and water inlet end are communicated with water inlet end and the water side of cooling line (711) respectively.

7. the uniform surface light source device for exposure machine according to claim 6 is characterized in that: all be coated with cooling line (711) in the heating radiator (710) of the top of each LED lamp (230).

8. the uniform surface light source device for exposure machine according to claim 6, it is characterized in that: described several LED lamps (230) are rectangular arrayed in welding wiring board (220), and described cooling line (711) length and width direction along the rectangular array of LED lamp (230) in heating radiator (710) is full of twists and turns.

9. the uniform surface light source device for exposure machine according to claim 8 is characterized in that: in the described heating radiator (710) in the adjacent two row cooling lines (711) flow direction opposite.

10. the uniform surface light source device for exposure machine according to claim 8, it is characterized in that: the water inlet end of described cooling line (711) and water side are positioned on the two adjacent row cooling lines (711) of heating radiator (710), and the water inlet end of cooling line (711) and water side are positioned at the same side of heating radiator (710).