KR20140138492A - Drilling apparatus using laser beam - Google Patents

Abstract

The present invention relates to a drilling apparatus using laser beam and, more specifically, to a drilling apparatus using laser beam capable of preventing foreign substances generated in a drilling processing of a workpiece from adhering to the workpiece. It is possible to make a workplace pleasant by collecting the foreign substances generated according to the drilling processing and to prevent workers from becoming unhealthy. A process for eliminating the foreign substances adhering to the workpiece can be omitted, thereby improving productivity, saving costs, and processing malfunction by determining whether the drilling-processed article has defects.

Description

[0001] DRILLING APPARATUS USING LASER BEAM [0002]

The present invention relates to a perforating apparatus using laser light, and more particularly, to a perforating apparatus using laser light, which can prevent foreign matter generated during perforation of a workpiece from adhering to a workpiece, The worker's health can be prevented from being deteriorated and the process for removing the foreign substance adhered to the workpiece can be omitted. Therefore, it is possible not only to improve the productivity but also to reduce the cost, The present invention relates to a punching apparatus using laser light capable of determining and processing a laser beam.

Laser processing systems are widely used in various fields of industry.

Particularly, in the case of drilling a workpiece, machining using a mechanical fine drill or exposure (port via) is the mainstream. In recent years, however, a drilling machine using laser light has been used.

The drilling machine using laser light is superior in machining speed and miniaturization of hole diameter compared to machining using fine drill.

In order to reduce the cost and maintenance cost of the laser oscillator, laser light using a CO ₂ laser or a high frequency solid-state laser is generally used.

Meanwhile, since a liquid crystal display (LCD) displays an image by adjusting the amount of light coming from the outside, a separate light source for illuminating the liquid crystal display, that is, a backlight unit is inevitably required .

The backlight unit includes a reflective sheet e for reflecting light emitted to the rear of the light guide plate. A reflective sheet made of a material such as MCPET (micro-forming polyethyleneterephthalate) is subjected to a perforating process do.

However, when foreign substances such as scrap, fume, etc. are attached to the surface of the reflective sheet when the perforating apparatus using the laser light is used to perforate the reflective sheet, The light transmittance of the sheet is lowered.

Therefore, a separate cleaning process is performed to remove foreign matters adhering to the reflection sheet, resulting in a low productivity and an increase in production cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art,

SUMMARY OF THE INVENTION An object of the present invention is to provide a punching apparatus using laser light capable of preventing a foreign matter generated during drilling of a workpiece from adhering to a workpiece.

Another object of the present invention is to provide a perforating apparatus using laser light capable of collecting foreign matter generated by perforating process to prevent a workplace from becoming comfortable and a worker's health being deteriorated.

It is a further object of the present invention to provide a perforating apparatus using laser light capable of omitting a process for removing foreign matter adhered to a workpiece, thereby improving productivity and reducing cost.

It is still another object of the present invention to provide a perforating apparatus using laser light capable of judging whether or not a perforated workpiece is defective and processing it.

According to another aspect of the present invention, there is provided a punching apparatus using laser light, the apparatus comprising: a laser oscillating unit; A direction switching unit for switching the direction of the laser beam irradiated from the laser oscillating unit; A focusing lens unit focusing the laser beam whose direction is changed by the direction switching unit; A processing table coupled to a machining plate having a plurality of holes, the machining table being disposed on an upper surface of the machining plate, the machining table being irradiated with a laser beam passed through the focusing lens unit and drilled; A suction unit provided at a lower side of the processing table and sucking air through a hole to suck and fix the workpiece to a processing plate coupled to the processing table; A dust collecting part disposed away from the processing plate coupled to the processing table and sucking and collecting air above the processing plate; And a control unit for controlling the workpiece to be perforated so as to control one or both of the direction switching unit, the focusing lens unit, and the processing table to be operated according to the puncturing pattern, Lt; / RTI >

And a jetting unit for jetting air toward the dust collecting unit via the upper surface of the workpiece to which the laser beam is irradiated.

The control unit may be configured to analyze the image photographed by the photographing unit to determine whether or not the image forming apparatus is defective.

The plurality of holes formed in the machining plate may be configured to be patterned and formed in accordance with the perforation pattern.

The workpiece may be a reflective sheet used for a backlight unit.

And the angle at which the reflective sheet is irradiated with the laser beam and perforated is 64 to 74 degrees.

The reflective sheet may be configured such that a protective sheet is attached to one or both of an upper surface irradiated with the laser beam passed through the focusing lens unit and a lower surface located on the opposite side of the upper surface of the reflective sheet.

When the protective sheet is attached to the upper surface of the reflective sheet, the distance between the focusing lens unit and the protective sheet may be set to be 67 to 77 mm.

According to the laser beam punching apparatus according to an embodiment of the present invention, it is possible to prevent foreign matter generated during drilling of a workpiece from adhering to the workpiece.

In addition, there is an effect that foreign matter generated by the drilling process is collected, thereby making the workplace comfortable and preventing the health of the worker from being deteriorated.

In addition, the present invention can omit the step of removing foreign matter from the workpiece, thereby improving the productivity and reducing the cost.

Further, the present invention has an effect that it is possible to judge whether or not a punched workpiece is defective and to process it.

FIG. 1 is a schematic configuration diagram of a laser drilling apparatus according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a view showing a drilling apparatus using laser light and a machining plate separated from a machining table according to an embodiment of the present invention.
FIG. 3 is a view illustrating a state where the machining plate shown in FIG. 2 is coupled to a laser beam punching apparatus according to an embodiment of the present invention.
FIG. 4 is a side view of a laser drilling apparatus according to an embodiment of the present invention shown in FIG.
FIG. 5 is a front view of a perforating apparatus using laser light according to an embodiment of the present invention shown in FIG. 3;
6 is a view illustrating an example of a part of a perforating apparatus using laser light and a reflective sheet according to an embodiment of the present invention.
FIGS. 7 to 9 are views illustrating a state of use of a laser beam punching apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. However, these drawings are for illustrative purposes only and the present invention is not limited thereto.

FIG. 1 is a schematic configuration diagram of a laser drilling apparatus according to an embodiment of the present invention. Referring to FIG. FIG. 2 is a view showing a drilled apparatus using a laser beam and a machining plate separated from a machining table according to an embodiment of the present invention. FIG. 3 is a view showing a machining plate shown in FIG. 2 in an embodiment of the present invention FIG. 3 is a view illustrating a state where the laser light is coupled to a perforating apparatus using the laser light. 3 is a side view of a perforating apparatus using laser light according to an embodiment of the present invention shown in FIG. 3, FIG. 5 is a sectional view of a perforating apparatus using laser light according to an embodiment of the present invention, FIG.

1 to 5, a laser beam punching apparatus according to an embodiment of the present invention includes a laser oscillating unit 10, a direction switching unit 20, a focusing lens unit 30, a processing table 40, A suction unit 50, a dust collecting unit 60, a jetting unit 70, a photographing unit 80, and a control unit 90. Here, to simplify the understanding of the present invention, the piping through which the air sucked through the adsorption unit 50 and the dust collection unit 60 moves is simplified.

The laser oscillating portion 10 is a portion where laser light oscillates, and a commonly used laser oscillator can be used.

The direction switching unit 20 is a component for switching the direction of the laser beam irradiated from the laser oscillating unit 10 and may be one or two or more reflectors, a galvanometer having two axes of XY and a three axis galvanometer of XYZ The scanner may be configured as a scanner. Here, although not shown, a so-called two-axis perforation device having two optical systems may be provided by providing a separate branch portion between the laser oscillating portion 10 and the direction switching portion 20.

The focusing lens unit 30 is a component that focuses the laser beam whose direction has been changed by the direction switching unit 20, and the laser beam whose irradiation direction is changed by the operation of the direction switching unit 20, particularly the galvanometer, For example, an f? Lens or the like.

Here, the laser oscillating portion 10, the direction switching portion 20, and the focusing lens portion 30 may be collectively referred to as a head portion. In the drawing shown in the present invention, such a head portion is shown as one, It is also possible to constitute one or more pairs of head portions.

The processing table 40 is a table 40 for processing a work (S in FIG. 6), for example, a place where a reflective sheet used for a backlight unit of a liquid crystal display (LCD) , And has a machining plate engaging space (E).

A machining plate 42 detachably attached to the machining table 40 and having a plurality of holes H is coupled to the machining table 40 through the machining plate engaging space E as shown in Fig. Here, the plurality of holes H formed in the machining plate 42 are formed in accordance with the perforation pattern to be perforated in the reflective sheet (S in Fig. 6), that is, the perforation pattern stored in the control section 90 And is patterned and formed. Particularly, the hole H thus formed in the pattern is easily removed from the foreign matter (D in FIG. 8), for example, scrap, fume and the like, generated during the perforation process of the reflection sheet (S in FIG. 6) It is also possible that The machining plate 42 is provided with a plurality of machining plates 42 having holes H having various shapes and various sizes according to the material of the reflective sheet (S in Fig. 6) to be drilled and the pattern to be drilled , It is possible to select and use the processing plate 42 suitable for the situation. 6) is placed on the upper surface of the processing plate 42 coupled to the processing table 40 and the laser light having passed through the focusing lens unit 30 is irradiated onto the reflecting sheet (S in Fig. 6) Of S). At this time, one or both of the machining plate 42 and the machining table 40 may be provided with a jig (not shown) so as to fix the position where the reflective sheet (S in Fig. 6) is drilled.

The adsorption unit 50 is provided on the lower side of the processing table 40 and sucks air through the hole H of the processing plate 42 so that the reflective sheet placed on the upper surface of the processing plate 42 ) To the machining plate 42, a suction fan can be used. 8D), for example, a scrap, a fume, or the like, which is generated during the punching process of the reflection sheet (S in Fig. 6), is formed in the air sucked through the adsorption unit 50 Can be inhaled. The adsorption unit 50 is configured to be connected to the dust collection unit 60 described below so that air sucked through the adsorption unit 50, that is, air including a scrap, a fume, 60).

The dust collecting section 60 is disposed apart from the processing plate 42 coupled to the processing table 40 and sucks air by suctioning the air above the processing plate 42 to generate dust (D in Fig. 8) such as dust, debris, fume and the like together with the adsorption part 50. [ 6D) is not attached to the reflecting sheet (S in Fig. 6) through the adsorption part 50 and the dust collecting part 60 so that the light transmittance of the reflecting sheet (S in Fig. 6) It is possible to eliminate the concern that the hole drilled by the foreign substance (D in Fig. 8) is prevented from clogging. Here, filtering means for filtering the foreign substances (D in Fig. 8) sucked and collected, and storage means for storing the filtered foreign substances may be further included. However, this simply filters the foreign matter (D in Fig. 8) Or a space for storing a certain amount of data. A suction fan may be used for sucking air into the dust collecting unit 60. When the suction unit 50 and the dust collecting unit 60 are connected to each other, The adsorption of the adsorbent S and the collection of the air may be both performed. Alternatively, a suction fan may be installed in the adsorption unit 50 and the dust collection unit 60, respectively.

6) of the reflection sheet (S in Fig. 6), that is, the air is sprayed toward the dust collection unit 60 via the upper surface of the reflection sheet (S in Fig. 6) The injected air helps the dust collecting part 60 to suck the foreign matter (D in FIG. 8) such as debris, fume and the like generated in the perforating process of the reflecting sheet (S in FIG. 6). The sprayer 70 may be configured to continuously spray air during operation of the laser beam punching apparatus according to an embodiment of the present invention, S is irradiated with a laser beam to perform drilling, it is preferable that the jetting section 70 is operated, that is, it is configured to jet air.

On the other hand, the present invention may further include a photographing unit 80 for photographing a state in which the reflection sheet (S in Fig. 6) is perforated, for example, a camera. Thus, in the control section 90 described below, the image photographed by the photographing section 80 can be analytically measured, and it can be judged whether or not the processed image has been processed into the input dimensions, thereby judging whether or not the perforated workpiece is defective. The image taken in this manner is reflected by the direction switching unit 20 when the head unit (the laser oscillating unit 10, the direction switching unit 20, and the focusing lens unit 30) Can be used to adjust the alignment of the substrate. On the other hand, as a result of the judgment as to whether or not such a defect is present, the normal good product is discharged to the good product discharge portion, and if it is defective, it can be discharged to the separately provided poor product discharge portion. In addition, when it is judged to be defective, it is possible to inform the operator of the defective product by lighting a warning lamp, generating a warning sound, or the like.

The control unit 90 is a component for controlling and driving the respective components constituting the laser beam piercing apparatus according to an embodiment of the present invention. The control unit 90 is provided with a storage medium for storing separate programs for controlling the respective components. A puncturing pattern for perforating the reflection sheet (S in FIG. 6) is also stored in the storage medium. The control unit 90 controls the movement of the direction changing unit 20, the focusing lens unit 30, and the machining table 40 in the up, down, left, and right directions according to the stored perforation pattern, (S in Fig. 6) is perforated in a desired puncturing pattern. Here, the perforation pattern may be formed with holes H of the same size, but may be formed with holes H of various sizes. Further, the material of the reflection sheet (S in FIG. 6) may be made of a material other than MCPET (Micro-forming Polyethyleneterephthalate). Accordingly, the controller 90 can be configured to adjust the output of the laser oscillating unit 10 according to the size of the hole H in the perforation pattern, the material of the reflective sheet (S in FIG. 6), and the like.

6 is a view illustrating an example of a part of a perforating apparatus using laser light and a reflective sheet according to an embodiment of the present invention.

6, the reflection sheet S is provided on one or both of the upper surface on which the laser light having passed through the focusing lens unit 30 is irradiated and the lower surface located on the opposite side of the upper surface of the reflective sheet S The sheet G may be configured to be attached.

The process of attaching the protective sheet G to the reflective sheet S may be performed through a lamination process.

One of the disadvantages of laser drilling is the occurrence of fumes. When fumes are generated, the fume adheres to the surface of the reflective sheet S, so that the brightness of the light passing through the reflective sheet S varies with time, or the brightness is not as bright and dark as desired.

Conventionally, washing with chemicals and ultrasonic waves have been used to remove fumes, but the cost has been disadvantageously increased.

Accordingly, in the present invention, by employing a configuration in which a protective sheet G, that is, a polyester (PET) sheet is adhered to the upper and lower surfaces of the reflective sheet S, the fume is not applied to the surface of the reflective sheet S, (G), and the protective sheet (G) is removed after the punching process, a clean processing result without fume can be obtained in the reflection sheet (S).

On the other hand, the angle at which the reflective sheet S is irradiated with the laser beam and drilled is set at 64 to 74 degrees. The main function of the reflective sheet S is to convert the point light source generated in the liquid crystal display into the surface light source by passing the reflective sheet S. Accordingly, the reflective sheet S is designed such that the hole size of the portion where the liquid crystal display is located is small and the hole size becomes larger as the distance from the point light source of the liquid crystal display is increased. Accordingly, when the surface light source is changed, the uniformity of the bright and dark light can be made constant.

In the present invention, the angle at which the reflective sheet S is perforated is configured to have an angle of 64 to 74 degrees, particularly 69 degrees. When the hole is drilled in this angle, the illuminance difference of the surface light source is very small. If the puncturing angle is made larger than this, the illuminance difference of the surface light source becomes large, and commerciality is lost.

When the protective sheet G is attached to the upper surface of the reflecting sheet S, the distance between the focusing lens unit 30 and the protective sheet G is 67 to 77 mm. This is related to the spot size, and the spot size is the smallest at a distance of 67 to 77 mm, especially 72 mm, between the focusing lens unit 30 and the protective sheet G. [ If the distance between the focusing lens unit 30 and the protective sheet G is further increased, the spot size also becomes larger, which increases the size of the holes to be processed. This increases the light transmittance of the central portion of the reflective sheet S, thereby increasing the difference between the lightness and darkness of the surface illumination.

Hereinafter, a laser beam punching apparatus according to one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 7 to 9 are views illustrating a state of use of a laser beam punching apparatus according to an embodiment of the present invention.

First, in order to perform drilling, a machining plate 42 corresponding to a situation is selected and joined to the machining table 40 according to the material of the reflective sheet S to be drilled, the perforation pattern, or the like.

Then, as shown in Fig. 7, the reflective sheet S to be drilled is placed on the upper surface of the processing plate 42 coupled to the processing table 40. Then, as shown in Fig. At this time, a jig (not shown) is provided on both the processing plate 42 and the processing table 40 or both the processing plate 42 and the processing table 40 so that the reflective sheet S does not easily flow through the jig Position can be fixed.

Next, the reflective sheet S is positioned on the upper surface of the processing plate 42, and then the adsorption unit 50 is driven as shown in FIG. 8 to suck air through the holes H of the processing plate 42, S to the processing plate 42 by suction. At this time, although not shown, air sucked in accordance with the driving of the suction unit 50 is sent to the dust collecting unit 60 connected to the pipe, in particular, the filtering unit and the storage unit.

When the reflective sheet S is adsorbed and fixed according to the driving of the adsorption unit 50, preparation for performing the perforation process is completed.

9, when the laser oscillation unit 10 is driven through the control unit 90, the laser light passes through the direction switching unit 20 and the focusing lens unit 30, and the laser light is reflected on the upper surface of the processing plate 42 And the sheet S is irradiated to perforate the reflective sheet S

A foreign matter D such as a debris or a fume is generated while the reflection sheet S is processed through the laser light. This is caused by the dust collecting unit 50 and the dust collecting unit 50. That is, the air sucked by the suction unit 50 and the dust collecting unit 60 includes the foreign matter D, which is moved to the dust collection unit 60 through the pipe. In the jetting section 70, air is jetted toward the dust collecting section 60 via the side where the foreign matter D is generated, that is, the upper side of the reflecting sheet S, and in the dust collecting section 60, The foreign matter D is collected by sucking the air containing the foreign matter D by spraying.

In the following graphs, the protective sheet G is removed after the protective sheet G is attached to the reflecting sheet S through the lamination process, and the result of measurement of the color coordinates of the reflecting sheet S is shown .

In order to manage the measurement data, color coordinates for x direction and y direction were arbitrarily divided. Among them, a significant difference occurred in the y direction color coordinate value, and this value was tested as an important management point. When the display device, for example, a TV, is produced, the color coordinates do not change and the light uniformity is constant.

TOP_25 shown in the graph indicates that a protective sheet G having a thickness of 25 mu is attached to the upper surface of the reflective sheet S and BOT_25 indicates that a protective sheet G having a thickness of 25 mu is adhered to the lower end of the reflective sheet S .

Aging is a process of removing fumes remaining on the reflection sheet S and irradiating the light onto the reflection sheet S using an LED in a chamber of a certain temperature (about 60 degrees) (about 1 hour 30 minutes) Minute) to remove the fume. At this time, the light of the light aging means the light of blue which is produced by using the LED or the like.

As a result of such a test, there is a significant difference in the value of the color coordinate when the protective sheet G is adhered only to the upper surface of the reflective sheet S and only when adhered to the upper surface only, After a certain period of time, the color coordinate becomes constant.

It was confirmed that the highest efficiency was obtained by attaching the protective sheet to both the upper and lower surfaces of the reflective sheet S, which is the smallest value.

As described above, the laser beam punching apparatus according to the embodiment of the present invention prevents foreign matter D such as scrap, fume and the like generated by the punching process from adhering to the reflection sheet S It is possible to eliminate the possibility that the light transmittance of the reflective sheet is lowered and that the perforated hole is blocked, and the foreign matter D generated by the perforating process is collected through the adsorption unit 50 and the dust collecting unit 60, And the worker's health is prevented from being deteriorated.

In addition, it is possible to improve the productivity and reduce the cost by omitting the process of removing the foreign substance from the reflection sheet S, and also to judge whether or not the perforated reflection sheet S is defective and to process it.

Thus, those skilled in the art will appreciate 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 embodiments described above are to be considered in all respects as illustrative and not restrictive and the scope of the invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

10: laser oscillation section 20:
30: focusing lens unit 40: machining table
42: machining plate 50:
60: dust collecting part 70:
80: photographing section 90:
E: machining plate engaging space H: hole
S: reflective sheet G: protective sheet
D: Foreign matter

Claims (10)

In a punching apparatus using laser light,
A laser oscillating portion;
A direction switching unit for switching a direction of a laser beam emitted from the laser oscillating unit;
A focusing lens unit focusing laser light whose direction is changed by the direction switching unit;
A machining table to which a machining plate having a plurality of holes is coupled and in which a workpiece arranged on the upper surface of the machining plate is irradiated with a laser beam passed through the focusing lens unit and drilled;
A suction unit provided at a lower side of the machining table and sucking air through the hole to suck and fix the workpiece on a machining plate coupled to the machining table;
A dust collecting part disposed away from the processing plate coupled to the processing table and sucking and collecting air above the processing plate; And
And a control unit for controlling the at least one of the direction switching unit, the focusing lens unit, and the machining table to operate in accordance with the puncturing pattern, Lt; / RTI > The method according to claim 1,
Further comprising a jetting portion for jetting air toward the dust collecting portion via an upper surface of the workpiece to which the laser beam is irradiated. 3. The method of claim 2,
Further comprising a photographing section for photographing a state in which the workpiece is perforated,
Wherein the control unit analyzes the image photographed by the photographing unit to determine whether the image is defective. 4. The method according to any one of claims 1 to 3,
Wherein the plurality of holes formed in the machining plate are patterned according to the perforation pattern. 5. The method of claim 4,
Wherein the work is a reflective sheet used for a backlight unit. 6. The method of claim 5,
Wherein an angle at which the laser beam is irradiated to the reflection sheet and the laser beam is perforated is 64 to 74 degrees. 6. The method of claim 5,
The reflective sheet may include:
Wherein a protective sheet is attached to one or both of an upper surface irradiated with laser light having passed through the focusing lens unit and a lower surface located opposite to the upper surface of the reflective sheet. The method according to claim 6,
The reflective sheet may include:
Wherein a protective sheet is attached to one or both of an upper surface irradiated with laser light having passed through the focusing lens unit and a lower surface located opposite to the upper surface of the reflective sheet. 8. The method of claim 7,
When the protective sheet is attached to the upper surface of the reflective sheet,
And the distance between the focusing lens unit and the protective sheet is 67 to 77 mm. 9. The method of claim 8,
When the protective sheet is attached to the upper surface of the reflective sheet,
And the distance between the focusing lens unit and the protective sheet is 67 to 77 mm.

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