KR101404851B1 - Ultra violet spot cure apparatus using a led - Google Patents

Abstract

An object of the present invention is to provide an ultraviolet spot curing device using an LED, which can change light emitted from an LED into a beam in the form of a spot using three lenses. To this end, an ultraviolet spot curing apparatus using an LED according to the present invention comprises a light emitting module composed of an LED and outputting ultraviolet rays according to a control signal transmitted from a controller of the ultraviolet spot curing system; A first lens mounted on an upper end of the light emitting module; A second lens mounted on the upper end of the first lens at a predetermined interval from the first lens; And a third lens mounted on the upper end of the second lens at a predetermined distance from the second lens.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ultraviolet spot-

The present invention relates to an ultraviolet ray curing apparatus, and more particularly, to an ultraviolet ray spot curing apparatus using an LED.

Ultraviolet ray paints are increasingly used due to environmental friendliness, economical efficiency, workability and productivity improvement, and energy saving effects. These ultraviolet paints are characterized by ultraviolet (UV) curable materials. That is, the ultraviolet ray paint means a material which undergoes a photochemical reaction by the energy of ultraviolet rays (100 to 400 nm) and cures from a liquid phase to a solid phase.

The ultraviolet ray paint has characteristics that the reaction time and physical properties of the coating film are changed depending on the relationship with the ultraviolet ray curing machine. Such ultraviolet ray paints and ultraviolet ray curing machines are widely used not only for the manufacture of large-sized furniture and flooring, but also for the production of home appliances such as semiconductors and cellular phones. Techniques for the ultraviolet curing machine are disclosed in, for example, Published Publications 10-2005-0047588 and 10-1035261.

The ultraviolet curing unit may be configured to be capable of irradiating a line-shaped beam, or may be configured to irradiate a spot-shaped beam.

Conventional ultraviolet spot curing machines capable of irradiating spot-type beams have the following problems.

First, a conventional ultraviolet spot-curing machine uses a reflector for a mercury-intensive lamp to transmit light to an optical fiber to irradiate an ultraviolet (UV) beam. Therefore, the conventional ultraviolet spot curing apparatus has a high optical loss and a very low light irradiation intensity of from 30 W / cm 2 to 120 mW / cm 2, which takes more than two minutes to cure the final cured product.

Second, since the conventional ultraviolet spot curing machine has a problem of deformation of the cured product due to excessive heat emission and an increase in the risk of the working environment, a sufficient cooling system is required to prevent it, and thus additional costs are incurred.

Disclosure of the Invention The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide an ultraviolet spot curing device using an LED, which can convert light emitted from an LED into a spot- do.

According to an aspect of the present invention, there is provided an ultraviolet spot curing apparatus using an LED, comprising: a light emitting module including an LED and outputting ultraviolet rays according to a control signal transmitted from a controller of an ultraviolet spot curing system; A first lens mounted on an upper end of the light emitting module; A second lens mounted on the upper end of the first lens at a predetermined interval from the first lens; And a third lens mounted on the upper end of the second lens at a predetermined distance from the second lens.

The present invention can rapidly cure the ultraviolet ray paint by changing the light emitted from the LED to a spot type beam by using three lenses, thereby increasing the production efficiency of the cured product, Reduction and the like can be improved.

FIG. 1 is a perspective view showing an outer shape of an ultraviolet spot curing apparatus using an LED according to the present invention and a controller for controlling the same.
2 is a view showing an example of the internal structure of an ultraviolet spot curing apparatus using an LED according to the present invention.
3 is a view showing an example of a head portion of an ultraviolet spot curing apparatus using an LED according to the present invention in detail.
4 is a view showing an example of the shapes of lenses applied to an ultraviolet spot curing apparatus using an LED according to the present invention.
5 is an exemplary view showing a state in which ultraviolet rays are output by an ultraviolet spot curing apparatus using an LED according to the present invention.
6 is a view illustrating a simulation result for explaining the characteristics of an ultraviolet spot curing device using an LED according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the outline of an ultraviolet spot curing apparatus using an LED according to the present invention and a controller for controlling the same, FIG. 2 is an exemplary view showing the internal structure of an ultraviolet spot curing apparatus using an LED according to the present invention, 4 is a view illustrating the shape of lenses applied to an ultraviolet spot curing apparatus using an LED according to an embodiment of the present invention, FIG. 6 is a view illustrating a simulation result for explaining characteristics of an ultraviolet spot-curing device using an LED according to the present invention. FIG.

The ultraviolet spot curing apparatus 400 using an LED according to the present invention cures the ultraviolet curing paint by outputting ultraviolet rays to the surface of a product coated with the ultraviolet curing coating. As shown in Fig. 1, And is driven according to the control.

The controller 300 is composed of various buttons and displays. When the user starts driving the spot curing unit 400 using the button, power is supplied from the controller 300 to the spot curing unit 400. Accordingly, the spot curing unit 400 emits ultraviolet rays to cure the ultraviolet ray paint.

As shown in FIG. 2, the ultraviolet spot curing apparatus 400 using an LED according to the present invention includes a heat dissipating unit 200 and a head unit 100.

3, the head unit 100 includes an LED (light emitting module) 140 for outputting ultraviolet rays in accordance with a control signal transmitted from the controller 300 of the ultraviolet spot curing system A first lens 110 mounted on the upper end of the light emitting module 140 and a second lens 120 mounted on the upper end of the first lens 110 at a predetermined distance from the first lens 110, And a third lens 130 mounted on the upper end of the second lens 120 at a predetermined distance from the second lens 120.

The light emitting module 140 is driven by a driving signal transmitted from the controller 300 and a power source to output ultraviolet rays. Only a specific wavelength such as UV 365 nm or 385 nm is output from the light source of the light emitting module 140 itself. The LEDs constituting the light emitting module 140 are a type of semiconductor device that allows electricity to flow in the forward direction and not conduct electricity in the reverse direction. The LEDs include a small number of carriers (electrons, holes) injected using the PN junction structure of semiconductors, Lt; / RTI > That is, the LED emits light when a constant voltage is applied in the forward direction, and is characterized in that it is smaller than conventional lamps, has a long life, and has high luminous efficiency because electric energy is directly changed into light energy. In addition, LEDs are characterized by price competitiveness and high luminous efficiency. On the other hand, the wavelength of the LED may be variously changed depending on the characteristics of the ultraviolet ray paint and the degree of curing. Various control signals can be transmitted and received between the light emitting module 140 and the controller 300 through PWM and RS232 communication.

The first lens 110 functions to converge the ultraviolet light output from the light emitting module 140 as much as possible. To this end, the first lens 110 is formed of a converging lens having a convex surface, as shown in Fig.

That is, the first lens performs a function of collecting light by minimizing the angle of ultraviolet light having a large directivity angle output from the light emitting module. That is, the first lens performs a function of preventing a phenomenon that light outputted from the light emitting module spreads to cause a light loss.

The second lens 120 refracts the light so that the light converged through the first lens 110 has a predetermined divergence angle. For this, as shown in FIG. 4, the second lens 120 is formed of a converging lens having an incident surface formed of a convex lens and an emitting surface formed of an aspherical surface. 4, the leftmost surface of the second lens 120 is an entrance surface, and the right surface is an exit surface. Although not clearly shown in FIG. 4, the most convex center portion of the exit surface forms a spherical surface, And the surface is formed in an increasingly flat shape from the central portion to the peripheral portion of the emitting surface.

That is, the second lens serves to converge the light transmitted through the first lens to a target point.

The third lens 130 converts the light output through the second lens 120 into a spot-shaped beam. For this, as shown in FIG. 4, the third lens 130 is formed in a convex shape on both sides and is formed of a condensing lens having different curvatures on both sides.

That is, the third lens performs a function of changing the light converged to the target point through the second lens into a spot-shaped beam having the maximum irradiation intensity. To this end, the third lens performs a function of removing the aberration by minimizing the blur of the final imaging point.

In particular, the third lens 130 may be a condenser lens having a ratio of a focal length in the X-axis direction, which is located on a plane perpendicular to the optical axis, with respect to the optical axis of the third lens 130 is 1: 2: As shown in FIG.

That is, from the light emitting module to the center vertical plane of each of the first lens, the second lens, and the third lens with respect to the optical axis passing through the centers of the first lens, the second lens and the third lens from the light emitting module It is preferable that the ratio of each distance is 1: 2: 4. 3, the optical axis D passing through the center of the first lens, the second lens, and the third lens is referred to as an optical axis D from the light emitting module 140 to the first lens The distance B from the light emitting module 140 to the surface of the exit surface of the second lens 120 and the distance B from the light emitting module 140 to the surface of the exit surface of the second lens 120, (A: B: C) of the distance C to the surface of the exit surface of the third lens 130 is preferably 1: 2: 4.

The reason why the ratio of distance between the light emitting module (light source) and each of the lenses is 1: 2: 4 is because the efficiency of light is maximized when each lens is in the above-mentioned distance ratio. That is, the distance ratio is based on the location in accordance with the paraxial design of the optical system. In other words, the aberration is removed for each of the above-mentioned lenses, and when the focal length of each lens is optimized, the above-mentioned ratio is obtained.

On the other hand, if the curvatures and angles of the lenses are not optimized, optical aberration is generated and the intensity and the light efficiency of the final beam are deteriorated. In order to compensate for these drawbacks, in the present invention, the radius of curvature of each lens is numerically expressed as shown in FIG.

The first lens 110 and the second lens 120 are fixed by a first fixing part 160. A first support portion 170 for supporting the first lens 110 and a second support portion 180 for supporting the second lens 120 are formed on the inner circumferential surface of the first fixing portion 160 Respectively.

The third lens 130 is fixed by a second fixing part 190. To this end, a third support portion 150 for supporting the third lens 130 is formed on the inner circumferential surface of the third fixing portion 190.

The second fixing part 190 is fastened to the first fixing part 170 through a screw groove. 3, thread grooves corresponding to each other are formed on the outer circumferential surface (or the inner circumferential surface) of the first fixing portion 170 and the inner circumferential surface (or the outer circumferential surface) of the second fixing portion 190 When the first fixing part 170 and the second fixing part 190 are rotated, the first fixing part 170 and the second fixing part 190 can be fastened.

The second fixing portion 190 rotates the inner circumferential surface or the outer circumferential surface of the first fixing portion 170 through the screw groove to thereby rotate the third lens 130 and the second lens 120 The distance of the curing irradiation distance can be varied.

5, the present invention can adjust the optically desired focal distance, and collects light in the form of a beam on the curing target surface, thereby obtaining a very high irradiation intensity And the uniformity of the beam can be improved. In addition, the present invention can complete the curing within 2 seconds and freely implement the curing distance desired by the customer.

Next, the heat dissipating unit 200 is connected to the head unit 100 and discharges heat generated from the head unit 100.

For this, an air-cooling type heat dissipation unit 200 or a water-cooling type heat dissipation unit 200 fixed to the lower end of the light emitting module 140 of the head unit 100 by the first fixing unit 170, Are in contact with each other.

A hole is formed in a cylindrical shape for heat dissipation in the heat dissipation unit 200. The entire heat dissipation unit 200 may be formed of a cylindrical heat dissipation fin.

That is, the heat dissipation unit 200 may be formed of an air-cooling type or a water-cooling type, which is generated by an LED of the light emitting module 140 and emits heat transferred to a substrate supporting the LED, have. The air-cooling type heat releasing portion may be formed integrally with the cover. The water-cooled heat-radiating portion is formed with a tube through which cold refrigerant can flow.

The heat dissipation unit 200 is a water-cooled or air-cooled type heat dissipation structure that is bonded under the metal PCB module in which the UV light emitting diodes of the light emitting module 140 are arrayed, It is possible to extend the lifetime of the diode and maintain the constant curing intensity.

The characteristics of the ultraviolet spot curing apparatus 400 using the LED according to the present invention are summarized as follows.

The present invention is capable of increasing the production efficiency by irradiating a light irradiation intensity of 6000 mW / cm 2 or more and curing within one second.

The conventional ultraviolet spot curing apparatus using LEDs measures a light irradiation intensity of about 600 to 700 mW / cm 2 when a lens of 12 mm is applied. However, the present invention applies the same size lens optical system to a light spot intensity of 3000 mW / cm 2 to 6000 mW / The hardening implementation has been greatly improved. Therefore, the present invention can improve the production efficiency of the cured product, improve the eco-friendly production line, and reduce the cost. The simulation results of the present invention are shown in Fig. That is, FIG. 6 shows the light irradiation intensity distribution according to the beam hardening distance.

The present invention can prevent the deformation of the cured product in advance, improve the working environment, and make the system very compact and efficient, which can reduce the production process cost by more than 10%.

The present invention can solve problems such as thermal deformation, productivity improvement, and quality improvement.

The present invention not only solves the disadvantages of UV lamp spot using conventional lamps but also can increase the production efficiency by irradiating with light irradiation intensity of 3000 mW / cm 2 or more and curing within 2 seconds, The problem that the coating material is not cured can be solved.

 The present invention can constitute three lenses of optical systems to collect ultraviolet (UV) energy optically and efficiently, and can produce a beam of a desired shape.

One of the most demanding processes in the cell phone assembly process, micro speaker bonding is a very precise process that requires very strong and flexible bonding of plastic and metal to eliminate mechanical acoustics. The present invention can be used for such a precision process.

Among the industries that use ultraviolet (UV) curing machines, the process of manufacturing optical films that are sensitive to thermal deformation and temperature, such as PP, PE, PVC, PET, and optical films, The invention can be applied to such a manufacturing process.

Further, the present invention may be used for manufacturing and repairing an endoscope. The ultraviolet (UV) adhesion according to the present invention can also be used for end sealing bonding, optical bonding and prism of an endoscope camera. Repair of the endoscope is mainly a special operation, and the present invention can also be used for repairing an endoscope cover mainly used for a coating requiring a high level.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: head part 200:
300: controller
400: UV spot curing machine using LED

Claims (10)

A light emitting module which is composed of LEDs and outputs ultraviolet rays according to a control signal transmitted from a controller of the ultraviolet spot curing system; A first lens mounted on an upper end of the light emitting module; A second lens mounted on the upper end of the first lens at a predetermined interval from the first lens; And a third lens mounted on the upper end of the second lens at a predetermined distance from the second lens,
Wherein the first lens is a converging lens having a convex surface, and the second lens has an incident surface of the second lens, which is adjacent to the first lens, is formed of a convex lens, And the third lens is a condensing lens having convex surfaces on both sides and different curvatures on both surfaces,
Wherein the center of the exit surface of the second lens is a spherical surface and the surface is formed in a gradually flat shape from a central portion of the exit surface toward a peripheral portion,
The distance from the light emitting module to the surface of the exit surface of the first lens and the distance from the light emitting module to the exit of the second lens, Wherein the ratio of the distance to the surface of the first lens and the distance from the light emitting module to the surface of the exit surface of the third lens is 1: 2: 4. The method according to claim 1,
Wherein the first lens collects the ultraviolet rays output from the light emitting module in a predetermined direction,
Wherein the second lens converges the ultraviolet ray transmitted through the first lens to a target point,
Wherein the third lens changes the light converged at the target point through the second lens into a spot-shaped beam. delete delete 3. The method of claim 2,
The image-side first lens and the second lens are fixed by a first fixing portion,
And the third lens is fixed by a second fixing part. 6. The method of claim 5,
And the second fixing part is fastened to the first fixing part through a screw groove. The method according to claim 6,
The distance between the third lens and the second lens is adjusted by rotating the inner circumferential surface or the outer circumferential surface of the first fixing part through the screw groove and the curing irradiation distance can be varied UV spot spot curing machine using LED. 6. The method of claim 5,
Wherein an air-cooled heat dissipating portion fixed by the first fixing portion is in contact with a lower end of the light emitting module. 9. The method of claim 8,
Wherein a hole is formed in a cylindrical shape for heat dissipation within the heat dissipation unit, and the entire heat dissipation unit is formed of a cylindrical heat dissipation fin. 6. The method of claim 5,
Wherein a heat dissipating portion of a water-cooled type fixed by the first fixing portion is in contact with the lower end of the light emitting module.

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