KR20100133528A

KR20100133528A - Apparatus for machining a light guide plate using a laser and method thereof

Info

Publication number: KR20100133528A
Application number: KR1020090052119A
Authority: KR
Inventors: 윤태중
Original assignee: 윤태중
Priority date: 2009-06-12
Filing date: 2009-06-12
Publication date: 2010-12-22

Abstract

PURPOSE: Light guide plate processing device and method using laser are provided to enhance the processing performance of a light guide plate by generating uniform laser using a step-dependent cooling device and to enable uniform and optimal laser pulse to be generated through a shutter unit. CONSTITUTION: A light guide plate processing device using laser consists of a laser generating unit(100), a transfer unit(300), an optical unit(200) and a control unit(400). The laser generating unit generates laser to process an optical pattern and comprises a laser source and a cooling unit. The cooling unit maintains the laser source at a given temperature. The transfer unit transfers the light guide plate on a given length base to process the optical pattern. The optical unit radiates the generated laser to the transferred light guide plate according to the optical pattern. The control unit controls the laser generating unit, the transfer unit and the optical unit to process the optical pattern on the light guide plate.

Description

Apparatus for machining a light guide plate using a laser and Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate processing apparatus using a laser, and a device for processing an optical pattern using a laser on a light guide plate used in a backlight unit, and a method of processing an optical pattern on a light guide plate.

BACKGROUND ART Liquid crystal displays (LCDs), which are recently attracting attention as display devices, inject liquid crystals between substrates on which electrodes for controlling each pixel are formed, and form an electric field between the substrates to display image information. The state is changed and the desired image information is displayed using the transmittance difference accordingly.

Unlike a plasma display pannel (PDP), an LCD, such as a liquid crystal itself, does not emit light, but only light passes. Therefore, a light source device must be separately provided to display image information.

A light source device provided in an LCD or the like is commonly referred to as a backlight unit. The backlight unit includes a light source such as a cathode ray tube generating light, an LED, a fluorescent lamp, and a light guide plate and a prism sheet to evenly distribute light generated from the light source. .

In a backlight unit used in an LCD or the like, the light source is generally located at the end of the LCD, and several sheets including the light guide plate are required to evenly distribute the light generated at the end.

The double light guide plate is usually made of an acrylic resin to form a constant optical pattern in an intaglio or embossed on one side. The optical pattern plays a role that the light generated from the light source comes out of the light guide plate during propagation by total reflection, that is, the incident angle of the light propagated at a specific position is less than the critical angle so that the light generated from the light source provided on one side is transferred to the entire LCD. Serve evenly.

Conventionally, the light guide plate formed with the optical pattern is manufactured by injection molding through a mold in which the optical pattern is formed, but it is very difficult to manufacture a light guide plate applied to a large size of 10 inches or more. There is a problem in that the light guide plate of a predetermined thickness or less through the injection molding is becoming thinner.

In addition, in the case of injection molding, an expensive mold is absolutely required to manufacture a light guide plate, and thus, it is difficult to cope with the market situation of a small quantity multi-variate.

In addition, in the case of a light guide plate processing apparatus using a conventional laser, not only the defect rate is high but also the processing time of the light guide plate is very long compared to injection molding, resulting in high manufacturing cost and inferior economic efficiency.

The present invention is to solve the above problems, an object of the present invention is to increase the processing speed by processing the light guide plate in a predetermined length unit, improve the quality of light guide plate processing by generating a uniform laser using a step-by-step cooling device. The present invention provides a light guide plate processing apparatus and a processing method using a laser that can generate a laser pulse having energy uniformly and optimized for light guide plate processing through a shutter device, thereby improving the quality of the optical pattern processed on the light guide plate and enabling rapid processing. .

A light guide plate processing apparatus using a laser of the present invention to achieve the above object, the laser processing apparatus for processing an optical pattern on a light guide plate using a laser, comprising: a laser generating unit for generating a laser for processing the optical pattern; A transfer unit for transferring the light guide plate by a predetermined length unit for processing the optical pattern; An optical unit irradiating the generated laser beam to the light guide plate transferred in the predetermined length unit according to the optical pattern; And a control unit for controlling the laser generation unit, the transfer unit, and the optical unit to process the optical pattern on the light guide plate.

In addition, the laser generation unit comprises a laser light source, and a cooling device for maintaining the laser light source at a predetermined temperature.

In addition, the laser light source comprises a carbon dioxide laser.

The laser generating unit may further include a shutter device, wherein the control unit controls the laser to be continuously generated from the carbon dioxide laser, and controls the operation of the shutter device to generate a laser pulse corresponding to the optical pattern. do.

In addition, the shutter device includes an acoustic optical modulator (AOM).

In addition, the laser light source is a laser light source for generating a laser of substantially 10㎛ to 20㎛ (acrylic absorption wavelength band).

In addition, the cooling device adjusts the temperature of the laser light source within the range of ± 0.1 ℃ of the predetermined temperature.

In addition, the cooling device controls the temperature through at least two or more steps to adjust the temperature in the range of ± 0.1 ℃ of the predetermined temperature, characterized in that the width of the temperature control is narrowed as each step passes.

In addition, the cooling device is a cooling device using a cooling water, and comprises a temperature sensor for sensing the temperature of the cooling water in the main cooling unit, the auxiliary cooling unit and the main cooling unit to maintain a constant temperature of the cooling water, The auxiliary cooling unit is provided at the inlet or the outlet of the main cooling unit, and heats or cools the cooling water flowing in or out of the main cooling unit based on the temperature of the cooling water detected by the temperature sensor.

In addition, the optical unit is a scanner for irradiating the laser to the light guide plate according to the optical pattern, an optical fiber for transmitting the laser generated from the laser generating unit to the scanner, and a scanner driving unit for driving the scanner in response to the optical pattern It includes.

The transfer unit may include a stage on which the light guide plate is placed, and a flat member that maintains flatness of a portion of the light guide plate placed on the stage to which the optical unit irradiates a laser.

In addition, the transfer unit is characterized in that it further comprises a feeding unit for moving the light guide plate corresponding to the optical pattern on the stage, and a fixing unit for fixing the light guide plate located on the flat member.

In addition, the feeding unit is characterized in that for transporting the light guide plate by a predetermined distance corresponding to the optical pattern.

In addition, the fixing unit is operated by pneumatic, characterized in that provided in a position facing the flat member with the light guide plate therebetween.

In addition, the flat member is made of a bar-type steel material, and is disposed in the direction perpendicular to the conveying direction of the light guide plate in the central portion of the stage.

In order to achieve the above object, the light guide plate processing method using the laser processing apparatus of the present invention is a light guide plate processing method for processing an optical pattern on a light guide plate using a laser processing apparatus, the stage of the laser processing apparatus according to the optical pattern Transferring the light guide plate provided on the substrate in a predetermined length unit; Processing an optical pattern corresponding to the transferred portion of the light guide plate by irradiating a laser to the light guide plate transferred in a predetermined length unit in the transfer step through the optical unit of the laser processing apparatus; And repeating the transfer step and the machining step until the processing of all the optical patterns on the light guide plate is completed.

In addition, the processing direction of the light guide plate and the moving direction of the optical unit for processing the optical pattern in the processing step is characterized in that perpendicular to each other.

The present invention having the above configuration has the effect of significantly improving the processing speed because the processing is made while transferring the light guide plate in the unit of a predetermined length during the processing of the optical pattern.

In addition, since the processing is performed by a predetermined length unit, the flatness of the entire light guide plate does not need to be uniformly maintained, thereby enabling more efficient processing.

In addition, as the laser pulse is generated by using the shutter device, there is an effect of uniformly generating a laser optimal for light guide plate processing.

In addition, the use of the shutter device has the effect of supplying a laser that is uniform and optimized for processing even in fast processing.

In addition, by using the step-by-step cooling device to maintain a constant temperature of the laser light source has the effect of generating a uniform and high-quality laser.

Hereinafter, a light guide plate processing apparatus and a processing method using a laser according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a laser processing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an overall configuration of a laser processing apparatus according to an embodiment of the present invention.

Light guide plate processing apparatus using a laser according to an embodiment of the present invention for processing the optical pattern on the light guide plate laser generated in the laser generating unit 100 and the laser generating unit 100 for the processing of the optical pattern (A) It includes an optical unit 200 for irradiating a laser, a transfer unit 300 for transferring the light guide plate in a predetermined length unit, and a control unit 400 for controlling each unit.

The laser generating unit 100 includes a laser light source 110 for generating a laser, a shutter device 120 for converting a laser generated from the laser light source 110 into a laser pulse, and a cooling device 130 for cooling the laser. Is done.

The laser light source 110 is a light source for generating a laser for processing the optical pattern A on the light guide plate 1, and the laser processing apparatus uses dots of the light corresponding to the optical pattern on the light guide plate 1 using the generated laser energy. (Including all shapes that form an optical pattern such as a circle and a rectangle) are formed.

There are various types of laser light source 110 according to the generation principle or the material used for amplifying the laser, and the characteristics of the laser generated according to the laser are also varied. 3 is a graph of the transmittance versus wavelength of the laser of the acrylic resin used as the light guide plate (1). In order to process a dot or the like forming an optical pattern on the light guide plate, the absorption rate of the laser to the material of the light guide plate must be high. The absorption rate of the laser is as shown in Equation 1 below, and the reflectance is related to the refractive index as shown in Equation 2 below.

Absorptivity = 1-reflectivity-transmittance

Reflectance = {(1-n) / (1 + n)} ²

Referring to FIG. 3, for example, an acryl mainly used in a light guide plate will be described for a laser suitable for light guide plate processing. In the case of acryl, the transmittance of the laser for a specific wavelength range is low. You can see the excellent. In order to efficiently process the laser, it is preferable that the absorption rate of acryl is approximately 50% or more, and the absorption rate of acryl is excellent in the wavelength range of 1.7 μm or more. Therefore, in order to process the optical pattern on the light guide plate 1, since the laser must be absorbed in acryl, it is suitable to process the optical pattern uniformly and efficiently using light having a high absorption band. Preferably, the carbon dioxide laser is suitable for processing a light guide plate made of acryl, because the absorption rate of acryl is 90% or more and the output is high.

In particular, the carbon dioxide laser is a gas laser using a transition between vibration levels of carbon dioxide, which is suitable for light guide plate processing using a laser because it has high absorption of acrylic resin used as the material of the light guide plate 10 and can be easily oscillated using an RF signal. Laser light source. However, in order to form an optical pattern, a laser having a pulse shape corresponding to the pattern needs to be irradiated to the light guide plate 1, so that an RF signal is applied to a carbon dioxide laser light source to generate a laser pulse corresponding to the optical pattern. The period of the RF signal is adjusted according to the optical pattern to be processed.

The dots forming the optical pattern have to be uniform in size in order to distribute the light evenly throughout the LCD, and the dot forming the optical pattern is not processed unless the energy of the laser becomes more than a predetermined size. In addition, as the thickness of the light guide plate becomes thinner, the dot size of the optical pattern formed on the light guide plate becomes smaller. To form such a small dot, the width of the laser pulse must be small. In addition, in order to achieve a high-speed processing that is suitable for mass production, not only a laser pulse having a uniform size and sufficient energy for processing a light guide plate should be generated, but also a short cycle of each pulse.

However, the carbon dioxide laser shows a waveform in which the energy of the laser generated when the laser is generated or stopped by the RF signal increases exponentially and decreases exponentially. Therefore, when a laser pulse is generated by a certain period of RF signal, the energy waveform of the laser does not have the shape of a square wave but is exponentially increased and then exponentially decreased. The RF signal period is shortened to process at speeds that are acceptable. As the RF signal cycle becomes shorter, the laser oscillated by the CO2 laser shows a waveform in which the energy decreases even before reaching the processing energy level, so that the dot is not processed on the light guide plate or the laser below the processing level continues to be used. To cause thermal deformation of the light guide plate. In addition, as laser oscillation and interruption are repeated at short intervals, there is a problem that the size of the processed dot is not constant because the energy of the oscillated laser is not constant.

The present invention can control the laser light source 110 to generate the laser continuously and to provide a shutter device 120 to block or pass through the laser output continuously to generate a pulse of uniform size for each pulse, Not only does the laser pulse above the processing level energy be generated, but also the waveform of the laser pulse can be made a square wave. That is, the CO2 laser is not turned on / off to generate a laser pulse, but the CO2 laser is controlled to be blocked / passed by using the shutter device 120 while continuing to generate a laser pulse suitable for processing. This enables the generation of laser pulses with high quality and uniform energy even at high processing speeds to meet mass productivity. For example, with a CO2 laser, the minimum on / off time is 150μs, but if the processing speed is 4m / s, dots below 0.6mm cannot be processed. However, the shutter device 120 can be turned on / off by about 1 μs, which is much shorter than the on / off time of the laser, so that the laser pulse can be generated even when processing at a processing speed suitable for mass production.

Accordingly, as the dot of the optical pattern processed on the light guide plate 1 is uniformly formed and only the laser of the processing level or more is irradiated, the optical pattern can be processed while minimizing the thermal deformation of the light guide plate 1 and is also suitable for mass production. There is an effect that can supply a high quality laser suitable for processing even at the processing speed.

As described above, the shutter device 120 is a device for generating a laser pulse by blocking and passing the laser generated continuously. The shutter device 120 may be used as long as the device can block or pass the laser for a very short time. However, it is preferable to use an AOM (Acoustic Optical Modulator) in which the refractive index is changed by the RF signal for ease of control of the shutter device 120. In AOM, the internal refractive index is changed by the RF signal, and accordingly, the refractive angle of the laser is changed. Therefore, the laser beam is not irradiated onto the light guide plate 1 by being off the path incident to the optical unit 200. Of course, the changed path may be provided with a dummy member 140 to absorb the energy of the laser.

Since the laser light source 110 oscillates the laser at a predetermined temperature or more, a lot of heat is generated. In addition, the laser light source 110 is sensitive to temperature, so if the temperature is not constant, the output of the laser is not constant, and thus the size of the processed dot is not uniformly formed. Therefore, in order to maintain a constant output of energy, the cooling apparatus 130 of the present invention maintains a constant temperature of the laser light source 110. As described above, according to the recent slimming trend, the thickness of the light guide plate becomes thinner and thus, the size of the dot forming the optical pattern must be formed very small. In addition, since the dot size must be uniform for uniform light distribution, it is very important to keep the uniformity of the laser output constant. However, conventional cooling apparatus has a deviation of about several degrees Celsius, which is not enough to uniformly form small dots. At approximately room temperature, the output fluctuations of the laser light source are typically formed in the range of 3% of the output (100W ± 3W for CO2 laser), but in order to form very small dots (approximately 40μm to 300μm), The temperature is preferably maintained within the range of ± 0.1 ℃ at a predetermined temperature.

It is practically very difficult to maintain the above temperature at a time or the cooling device that maintains the above temperature is very expensive, so the present invention controls the temperature through two or more steps. That is, in order to maintain the laser light source 110 at a predetermined temperature, the temperature is maintained in a range of ± 0.2 ° C. in one step of temperature control and the temperature adjusted in the first step is detected and the difference is adjusted in two steps. If the temperature is adjusted through three or more steps, step 3 detects the temperature adjusted in step 2 and adjusts the difference in step 3. The cooling device 130 maintains the temperature by using the cooling water, but the water is large and the temperature does not change easily. The reality is that it is difficult to control the temperature at once and it is more difficult to match the accuracy. Therefore, by providing a plurality of cooling unit and through this step by adjusting the temperature of the cooling water it is possible to adjust the temperature to the desired precision.

In one embodiment of the present invention by using the cooling unit 130 in two stages, that is, the main cooling unit 132 and the auxiliary cooling unit 134 by using an example to maintain a constant temperature of the laser light source 110 For example, in order to maintain the temperature of the laser light source 110 with an accuracy of 8 ± 0.1 ° C., if the temperature deviation of the specification of the main cooling part 132 is 0.2 ° C., the control temperature of the main cooling part 132 is 7.7. Set to ° C. In this case, even if the temperature deviation in the specification is taken into consideration, the maintenance temperature of the laser light source 110 does not exceed 8 ° C. The temperature sensor 138 is provided at the outlet of the main cooling unit 132 and the main cooling unit 132 exits. Compared with the temperature of the cooling water and the target holding temperature of 8 ℃ and the difference is supplemented by the auxiliary cooling unit 134. Auxiliary cooling unit is not a large temperature control capacity, but it is preferable to use a cooling device capable of temperature control more precisely, in the illustrative example, the auxiliary cooling unit 134 has only the function of heating, but to perform the function of cooling on the contrary. It may be possible to perform both heating and cooling. When the set temperature of the main cooling unit 132 is changed according to the function of the auxiliary cooling unit 134, the temperature of the laser light source 110 can be maintained at an accuracy of ± 0.1 ° C. Cooling water having a precision of ± 0.1 ° C. through the main cooling unit 132 and the sub cooling unit 134 of the cooling device 130 is obtained into the cooling chamber 136 surrounding the laser light source 110 to be laser light source. The temperature of the 110 is kept constant and circulated through the main cooling unit 132 and the auxiliary cooling unit 134. Cooling of the light source in the cooling chamber 136 uses the principle of forming a flow path through which cooling water flows between the electrode plates of the laser light source 110, cooling the electrode or providing a heat sink, and allowing the cooling water to flow through the heat sink. It can be cooled while moving around the various devices provided in the laser light source 110.

The optical unit 200 irradiates the light guide plate 1 with the laser generated by the laser generating unit 100 according to the optical pattern. The optical unit 200 may have a variety of configurations to irradiate the laser to the light guide plate 1 according to the optical pattern.

In one embodiment of the optical unit 200 of the present invention, the scanner 210 for irradiating a laser to the light guide plate 1 and the scanner driving unit 240 and the scanner 210 for moving the scanner 210 according to the optical pattern. It comprises a scanner support unit 220 for supporting the and a reflecting mirror 230 for injecting the laser generated in the laser generating unit 100 to the scanner 210. Of course, the laser generated by the laser generating unit 100 may be transferred to the scanner 210 through the optical fire. In addition, the expander 250 may be disposed on the optical path so that the beam waist of the laser irradiated to the light guide plate is thinly formed to improve the processability of the laser. In the above embodiment, although the reflection mirror 230 or the like is used to deliver the laser to the scanner 210, any optical configuration capable of transmitting the laser may be adopted as well as an optical fiber.

Recently, LCDs are becoming larger and the size of LGP is gradually increasing. As described above, it is impossible to process a thin light guide plate of a predetermined size or more by injection molding, and therefore, a processing apparatus using a laser is the only alternative. However, in order to produce a large-scale light guide plate in large quantities, it is preferable to use a scanner 210 capable of processing an optical pattern at a high speed, as in the embodiment of the present invention, because the processing speed is an important factor of economic judgment.

The scanner 210 of the present invention processes the optical pattern while reciprocating the light guide plate 1 vertically or horizontally in consideration of the ease of processing. The movement and the focus of the laser irradiated from the scanner 210 are focused on the light guide plate 1. In order to be accurately formed on the surface, the scanner support 220 is formed at a predetermined height to support the scanner 210.

A scanner driving unit 240 for moving the scanner 210 is provided between the scanner 210 and the scanner support part 220. The scanner driving unit 240 may be formed of a driving motor (not shown) and a gear unit (not shown), or may be configured in a chain, so that any configuration can be used to move the scanner 210 with high precision. none.

The transfer unit 300 is a device for transferring the light guide plate 1 provided on the stage 310 by a predetermined length unit. As described above, since the size of the dot formed in the light guide plate 1 becomes very small according to the recent trend, the optical unit 200 and the laser beam irradiated from the optical unit 200 are accurately formed on the surface of the light guide plate 1. The distance between the surfaces of the light guide plate 1 should be spaced by the focal length of the optical unit 200 and this distance should be kept very precisely with the entire surface of the light guide plate 1 being processed. However, the distance tolerance with the entire surface of the light guide plate 1 may vary depending on the precision of the optical pattern to be processed, and some error may be tolerated depending on the depth of focus of the laser to be irradiated.

To this end, conventionally, the stage is formed to a very precise uniformity, and a hole for forming a vacuum is formed in the lower part of the stage where the light guide plate 1 is placed, and a negative pressure is formed so that the light guide plate is accurately fixed to the stage. However, in order to process a large size light guide plate, the size of the stage becomes large and accordingly, there is a problem that it is very difficult or expensive to maintain the uniformity of the stage uniformly. Production was a difficult problem.

In order to solve this problem, the transfer unit 300 of the present invention does not precisely adjust the uniformity of the entire stage 310, but maintains uniformity only by a predetermined size and performs processing in a portion where uniformity is maintained. The light guide plate 1 is transferred in predetermined length units. That is, not all optical patterns are processed while the light guide plate 1 is fixed, but a part of the optical pattern is processed, the light guide plate 1 is transferred, and a part of the optical pattern is processed again, and the light guide plate 1 is transferred. The optical pattern is processed into the light guide plate 1. This eliminates the need to precisely maintain the uniformity of the entire stage on which the light guide plate 1 is placed, and the optical unit 200 only needs to reciprocate in a direction perpendicular to the transfer direction of the light guide plate 1, thereby simplifying the device configuration and processing. The effect is faster.

For this processing, the transfer unit 300 provides a flat member 320 formed to have a very precise uniformity at a portion of the stage 310 to be processed and onto the flat member 320 according to the degree of processing of the light guide plate 1. It comprises a pitching device 330 for transferring the light guide plate. However, as described above, if the depth of focus of the laser is irradiated, the flat member 320 may be omitted because accurate processing is possible despite a certain distance error. In addition, the flat member 320 may be omitted in the case of light guide plate processing (such as an LCD billboard) that does not need to be precisely processed. In order to maintain the distance between the light guide plate 1 and the optical unit 200 more precisely, the fixing unit 340 is provided at a position opposite to the flat member 320 with the light guide plate 1 therebetween to feed the feeding device 330. When the light guide plate 1 is transferred to the flat member 320 by pressing the light guide plate 1 from above, the light guide plate 1 is closely adhered to the flat member 320. In this way, the light guide plate 1 can be processed more efficiently and precisely.

The feeding device 330 performs a function of pushing or pulling the light guide plate to the flat member 320 for processing the light guide plate, and it is more efficient and precise to transfer the light guide plate 1 while pushing the light guide plate toward the flat member 320. It becomes possible to process.

The fixing unit 340 is a unit for fixing the light guide plate so that the light guide plate can be more smoothly and precisely operated by pneumatic operation.

The flat member 320 may be formed of various materials to ensure uniformity of the processed portion of the light guide plate, but it is preferable to provide a bar type form of steel material to minimize processing convenience and transfer resistance. .

A lower support part 350 for supporting the feeding device 330, the stage 310, etc. may be separately provided below the stage 310.

Referring to FIG. 5, a light guide plate processing method using a laser processing apparatus according to an embodiment of the present invention will be described. First, when the light guide plate to be processed is placed on the stage 310, the feeding unit 320 transfers the light guide plate by a predetermined length unit. (S100) After the light guide plate is transferred, the optical pattern is processed on a portion transferred using the optical unit 200, that is, a portion having uniformity through the flat member 320. (S110) After the processing is finished, it is determined whether the processing of the entire optical pattern is finished (S120). If not, the light guide plate is transferred again by a predetermined length unit and the corresponding optical pattern is processed through the optical unit 200. This transfer and processing step is repeated until the end of the processing of the optical pattern.

1 is a schematic block diagram of a laser processing apparatus according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing the overall configuration of a laser processing apparatus according to an embodiment of the present invention.

FIG. 3 is a graph showing absorbance versus wavelength of a laser of an acrylic light guide plate. FIG.

4 is a block diagram showing a schematic configuration of a cooling unit according to an embodiment of the present invention.

5 is a flowchart illustrating a light guide plate processing method using a laser processing apparatus according to an embodiment of the present invention.

Laser generating unit: 100 Optical unit: 200

Transfer Unit: 300 Control Unit: 400

Claims

In the laser processing apparatus for processing an optical pattern on a light guide plate using a laser,

A laser generating unit for generating a laser for processing the optical pattern;

A transfer unit for transferring the light guide plate by a predetermined length unit for processing the optical pattern;

An optical unit irradiating the generated laser beam to the light guide plate transferred in the predetermined length unit according to the optical pattern;

Light guide plate processing apparatus using a laser including a control unit for controlling the laser generating unit, the transfer unit and the optical unit for processing the optical pattern on the light guide plate.

In claim 1,

The laser generating unit and the laser light source,

A light guide plate processing apparatus using a laser, characterized by comprising a cooling device for maintaining the laser light source at a predetermined temperature.

In claim 2,

The laser light source is a light guide plate processing apparatus using a laser, characterized in that comprises a carbon dioxide laser.

In claim 3,

The laser generating unit further comprises a shutter device,

And the control unit controls the laser to be continuously generated in the carbon dioxide laser, and controls the operation of the shutter device to generate a laser pulse corresponding to the optical pattern.

In claim 4,

The shutter device is a light guide plate processing apparatus using a laser, characterized in that comprises an acoustic optical modulator (AOM).

In claim 2,

The laser light source is a light guide plate processing apparatus using a laser, characterized in that the laser light source for generating a laser having a wavelength substantially 1.7㎛ or more.

In claim 2,

The cooling device is a light guide plate processing apparatus using a laser, characterized in that for adjusting the temperature of the laser light source within the range of ± 0.1 ℃ of the predetermined temperature.

In claim 7,

The cooling apparatus adjusts the temperature through at least two or more steps to adjust the temperature in the range of ± 0.1 ℃ of the predetermined temperature, the light guide plate using a laser, characterized in that the width of the temperature control narrows as each step passes Processing equipment.

In claim 2,

The cooling device is a cooling device using a cooling water,

It comprises a temperature sensor for sensing the temperature of the cooling water in the main cooling unit, the auxiliary cooling unit and the main cooling unit in order to maintain a constant temperature of the cooling water,

The sub-cooling unit is provided at the inlet or the outlet of the main cooling unit, the light guide plate processing apparatus using a laser, characterized in that for heating or cooling the cooling water flowing in or out of the main cooling unit based on the temperature of the cooling water detected by the temperature sensor. .

In claim 1,

The optical unit includes a scanner for irradiating the laser to the light guide plate according to the optical pattern, a reflection mirror for transmitting the laser generated by the laser generating unit to the scanner, and a scanner driving unit for driving the scanner in response to the optical pattern. Light guide plate processing apparatus using a laser, characterized in that consisting of.

In claim 1,

The transfer unit includes a stage on which the light guide plate is placed, and a flat member which maintains flatness of a portion of the light guide plate placed on the stage to which the optical unit irradiates the laser.

In claim 11,

The transfer unit is a light guide plate processing apparatus using a laser, characterized in that further comprising a feeding unit for moving the light guide plate corresponding to the optical pattern on the stage, and a fixing unit for fixing the light guide plate located on the flat member.

In claim 11,

The feeding unit is a light guide plate processing apparatus using a laser, characterized in that for transferring the light guide plate by a predetermined distance corresponding to the optical pattern.

In claim 11,

The fixing unit is operated by pneumatic light guide plate processing apparatus using a laser, characterized in that provided in a position facing the flat member with the light guide plate therebetween.

In claim 11,

The flat member is made of a bar-type steel material, the light guide plate processing apparatus using a laser, characterized in that disposed in the direction perpendicular to the conveying direction of the light guide plate in the central portion of the stage.

In the light guide plate processing method of processing an optical pattern on the light guide plate using a laser processing device,

Transferring the light guide plate provided on the stage of the laser processing apparatus in a predetermined length unit according to the optical pattern;

Processing an optical pattern corresponding to the transferred portion of the light guide plate by irradiating a laser to the light guide plate transferred in a predetermined length unit in the transfer step through the optical unit of the laser processing apparatus;

A light guide plate processing method using a laser processing apparatus comprising repeating the transfer step and the processing step until the processing of all the optical patterns on the light guide plate is completed.

In claim 16,

The processing method of the light guide plate using a laser processing apparatus, characterized in that the transfer direction of the light guide plate and the moving direction of the optical unit for processing the optical pattern in the processing step are perpendicular to each other.