KR101109749B1

KR101109749B1 - Apparatus and method for manufacturing light guide plate

Info

Publication number: KR101109749B1
Application number: KR1020100023176A
Authority: KR
Inventors: 최성규
Original assignee: 주식회사 코스모인
Priority date: 2010-03-16
Filing date: 2010-03-16
Publication date: 2012-04-06
Also published as: KR20110104191A; WO2011115401A3; WO2011115401A2

Abstract

The light guide plate manufacturing apparatus of the present invention includes a transfer device for transferring a substrate for a light guide plate having a predetermined thickness; A detector for detecting movement of the substrate to be transferred; A pair of pressure rollers which are installed to face each other at predetermined intervals to press the substrate transferred by the transfer device up and down; A stamper attached to at least one of the pair of pressure rollers and having a light scattering pattern formed thereon; And a gap adjusting device connected to at least one of the pair of pressure rollers to adjust the gap between the pressure rollers. The gap adjusting device maintains the gap larger than the thickness of the substrate at the portion where the movement of the substrate detected by the detector is started, keeps the thickness smaller than the thickness of the substrate at the middle portion, and keeps the thickness larger than the thickness of the substrate at the end portion. Adjust the interval.

Description

Light guide plate manufacturing apparatus and method {Apparatus and method for manufacturing light guide plate}

The present invention relates to an apparatus and method for manufacturing a light guide plate, and more particularly, to an apparatus and method for manufacturing a light guide plate used for illuminating light in a flat panel display such as an LCD (Liquid Crystal Display).

A light guide plate is an optical component used for back light in a flat panel display such as an LCD or for uniformly transmitting light in a flat panel lighting device for indoor or outdoor lighting.

Such a light guide plate may be manufactured by pressing a rectangular substrate having a predetermined area with a stamper to form a light scattering pattern. FIG. 7 of Korean Patent Publication No. 10-0425511 discloses an apparatus and method for attaching a stamper to a pair of pressure rollers, and a light scattering pattern of the stamper is formed on the upper or lower surface of the substrate while the substrate passes through the pressure roller. It is.

According to this conventional method, the light scattering pattern of the stamper can be formed on the substrate only when the distance between the pair of pressure rollers is slightly smaller than the thickness of the light guide plate substrate. Referring to FIGS. 8A and 8B, the light guide plate substrate 506 is guided by the guide roller 507 to pass between the pair of pressure rollers 503 and 513. The stamper 500 is attached to the upper pressure roller 503. At this time, the thickness T1 between the two pressure rollers 503 and 513 should be slightly smaller than the thickness T1 of the light guide plate substrate 506, and the light scattering pattern of the stamper must pass through the two pressure rollers under the condition of T1> T2. Is formed.

However, when the distance T2 between both pressure rollers is smaller than the thickness T1 of the substrate, when the substrate passes between the pressure rollers 503 and 513 as shown in FIG. 8B, the edge of the substrate 506 is pressed by the pressure roller ( 503 and 513 hit first, so that the edge portion is broken finely. In addition, it is common to mirror-process the side surface of the light guide plate substrate 506 before forming the light scattering pattern. When the vinyl guide substrate remaining at the edge during the light guide plate mirror processing passes through the pressure rollers, it is separated from the substrate.

The debris 517 of the substrate edge or the debris 518 of vinyl paper stick to the stamper 500 or the light guide plate substrate 506 to contaminate them. When the contaminants 517 and 518 stick to the stamper 500, a defective light guide plate is formed in which a light scattering pattern is not formed at the portion where the contaminants adhere to, and when used continuously, such contamination is increased to increase the defective rate, and Used metal stampers also cause serious problems that require constant replacement.

In addition, even when the light guide plate in which the light scattering pattern is formed passes through the pressure rollers, contamination problems such as finely broken edges of the substrate or fragments of plastic paper remaining at the edges occur as in the case of entering.

An object of the present invention is to provide an improved light guide plate manufacturing apparatus and method that can solve the above problems.

Another object of the present invention is to provide a light guide plate manufacturing apparatus and method which can increase productivity and reduce cost by preventing contamination due to breakage of the edge of the light guide plate in a light guide plate manufacturing apparatus and method using a pair of pressure rollers.

In order to achieve these and other objects, the light guide plate manufacturing apparatus according to the first aspect of the present invention is a device for manufacturing a light guide plate formed with a light scattering pattern, the transfer device for transferring a light guide plate substrate having a predetermined thickness; A detector for detecting movement of the substrate to be transferred; A pair of pressure rollers which are installed to face each other at predetermined intervals to press the substrate transferred by the transfer device up and down; A stamper attached to at least one of the pair of pressure rollers and having a light scattering pattern formed thereon; And a gap adjusting device connected to at least one of the pair of pressure rollers to adjust the gap between the pressure rollers.

The gap adjusting device maintains the gap larger than the thickness of the substrate at the portion where the movement of the substrate detected by the detector is started, keeps the thickness smaller than the thickness of the substrate at the middle portion, and keeps the thickness larger than the thickness of the substrate at the end portion. Adjust the interval.

Specifically, the gap adjusting device may adjust the gap according to the substrate traveling time from the time when the detector detects the movement of the substrate. Preferably, the interval is greater than the thickness of the substrate for a predetermined time from the time when the entrance surface of the substrate enters the center line connecting the rotation axis of the pair of pressure rollers, and after the predetermined time the interval is the thickness of the substrate It is kept smaller and the gap is kept larger than the thickness of the substrate for a predetermined time before the exit surface of the substrate crosses the center line.

The gap adjusting device may be driven by a device for rotating or reciprocating motion.

The gap adjusting device may include a wedge-shaped gap adjusting bar whose inclined surface is horizontally connected to the pressure roller to move the pressure roller up and down when moving in the horizontal direction; And a driving device for transmitting power to move the gap adjusting bar in the horizontal direction.

Alternatively, the gap adjusting device is connected to the pressure roller, including a portion that changes the radius in a certain portion in accordance with the rotation, the cam for moving the pressure roller up and down; And it may be made of a cam drive device for driving the rotation of the cam.

The detector may be preferably composed of a light emitting part and a light receiving part, and the light scattering pattern of the stamper may be formed of an uneven pattern, and the height of the unevenness is preferably 20 μm or less.

The light guide plate manufacturing method according to the second aspect of the present invention is a light guide plate manufacturing method using a pair of pressure rollers which are installed to face each other at a predetermined interval to form a light scattering pattern on the substrate, the step of transferring the light guide plate substrate ; Detecting movement of the substrate; Passing the substrate through a pair of pressure rollers to form a pattern on the surface of the substrate by a stamper.

The pattern forming step may include: a first gap adjusting step of maintaining the gap greater than the thickness of the substrate at the beginning of the movement of the substrate detected in the detection step; A second gap adjusting step of maintaining a thickness smaller than the thickness of the substrate in the middle portion; At the end, a third gap adjusting step is performed, which is larger than the thickness of the substrate.

In the first to third interval adjusting step, it is possible to maintain the gap by driving at least one pressure roller of the pair of pressure rollers.

In the first to third interval adjustment steps, the interval may be adjusted according to the substrate travel time from the time point of detecting the movement of the substrate in the detection step. Specifically, the first interval adjustment step is performed for a predetermined time from the time when the entry surface of the substrate enters the center line connecting the rotation axis of the pair of pressure rollers, the two interval adjustment step is performed after the first interval adjustment step, Preferably, the interval adjustment step is performed for a predetermined time before the exit surface of the substrate passes the center line.

It is preferable to detect the entry surface or the exit surface of the substrate in the detection step.

According to the light guide plate manufacturing apparatus and method of the present invention, when the substrate for the light guide plate enters between the first pressure roller and the second pressure roller, the distance between the two pressure rollers is larger than the thickness of the substrate, so that the edges of the side surfaces of the substrate are separated from the first pressure roller. The phenomenon which hits the 2nd press roller can be eliminated. After the substrate entry surface crosses the centerline connecting the rotary shafts of the two pressure rollers, the gap adjuster adjusts the distance between the two pressure rollers to be smaller than the thickness of the substrate to form a light scattering pattern on the substrate, and immediately before the light guide plate exits the two pressure rollers. The gap between the two pressure rollers is adjusted to be greater than the thickness of the substrate by using a gap adjusting device to remove the phenomenon that the edge of the light guide plate exits the first pressure roller and the second pressure roller, thereby producing a light guide plate free of contamination.

1 is a view showing an embodiment of a light guide plate manufacturing apparatus according to the present invention,
2A-2F are diagrams for explaining the operation of the apparatus of FIG.
3 is a diagram showing a change in the interval between the pressing rollers with time;
4 is a view showing another example of the gap adjusting device used in the light guide plate manufacturing apparatus according to the present invention,
5a to 5e are views for explaining the operation of the apparatus of FIG.
6 is a view showing another example of the gap adjusting device used in the light guide plate manufacturing apparatus according to the present invention,
7a-7e are diagrams for explaining the operation of the apparatus of FIG.
8A and 8B illustrate a conventional light guide plate manufacturing apparatus.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the drawings, like reference numerals are used to refer to like elements.

First, referring to FIG. 1, an embodiment according to an apparatus and a method of manufacturing a light guide plate according to the present invention will be described. A transparent light guide plate material in which a light scattering pattern is not formed is cut into a predetermined light guide plate size and formed into a light guide plate substrate 106. 1 is loaded in the storage box 111. The light guide plate substrate 106 may have a mirror-finished side surface.

The loading apparatus 101 transfers the light guide plate substrate 106 to the transfer device 105 from the first loading box 111 on which the light guide plate substrate 106 is loaded. The transfer device 105 serves to transfer the light guide plate substrate 106 between the first pressure roller 103 and the second pressure roller 113, and may be formed by a known conveyor, a circulation belt, a guide rail, or the like. .

A plurality of guide rollers 107 for guiding the substrate 106 are disposed at the rear end of the transfer device 105 to transfer the substrate between the first pressure roller 103 and the second pressure roller 113.

The detector 150 which detects the movement of the board | substrate 106 is arrange | positioned at the front end of the 1st press roller 103 and the 2nd press roller 113. FIG. The detector may be formed in various forms, for example, an optical detection means consisting of a light emitting part and a light receiving part, or a weight detection means by detecting a movement of the substrate by detecting a weight of the substrate, or other mechanical or electrical detection The movement of the substrate can be detected by the means. In addition, the position of the detector may be variously changed according to the design, and the movement of the substrate may be detected at a position before the substrate 106 enters between the first pressing roller 103 and the second pressing roller 113. If it is possible. In FIG. 1, a detector 150 disposed up and down in front of the first pressure roller 103 and the second pressure roller 113 is illustrated, for example, the first pressure roller 103 and the second pressure roller ( It is also possible to install laterally slightly from the front end to the centerline connecting the rotation axis. The detector 150 detects the movement of the substrate 106 and sends a detection signal to a controller (not shown). The control unit controls the interval adjusting devices 160 and 161 to be described later according to the detection signal.

The first pressure roller 103 and the second pressure roller 113 are formed to face each other, and a stamper 100 for forming a light scattering pattern is attached to the first pressure roller 103. The light scattering pattern of the stamper 100 is formed of an uneven pattern, and the height of the unevenness is preferably 20 μm or less.

In FIG. 1, a stamper is attached only to the first pressure roller 103, but a stamper may be attached to both of the pressure rollers, and a stamper may be attached only to the second pressure roller 113, depending on the design. Inside the respective pressure rollers 103 and 113, a heating device 108 may be built in to heat the substrate. Therefore, the light scattering pattern of the stamper 100 is transferred to the substrate 106 in a heated and pressed state.

In addition, the gap adjusting devices 160 and 161 are connected to each of the pressure rollers 103 and 113 to adjust the gap between the two pressure rollers. The gap adjusting device may use a device in which the power source rotates or reciprocates, such as hydraulic and pneumatic or motor, and may be variously configured. 1, it is shown that the gap adjusting device is connected to both pressure rollers, but it is natural that the gap adjusting device is connected to only one of the pressure rollers to adjust the gap between the pressure rollers 103 and 113.

A preheating device (not shown) may be arranged before the light guide plate substrate 106 enters both of the pressure rollers 103. 113 to simultaneously preheat the top and bottom surfaces of the light guide plate substrate to prevent the substrate 106 from warping.

At the rear end of both the pressure rollers 103 and 113, a conveying device 109 is arranged to transport the light guide plate 106 'having a light scattering pattern, and the light guide plate is loaded into the second stacking box 110 by the unloading device 104. .

Operation of the light guide plate manufacturing apparatus according to the embodiment of the present invention configured as described above is as follows.

The light guide plate substrate 106 loaded in the first loading box 111 is transferred from the first loading box 111 to the transfer device 105 by the loading device 101, and is further removed by the guide rollers 107. It is directed between the first pressure roller 103 and the second pressure roller 113.

The detector 150 detects the movement of the substrate 106 and sends a detection signal to the controller, and the controller controls the interval adjusting device 160 according to the detection signal. That is, when the detector 150 detects that the substrate 106 enters the gap between the pressing rollers 103 and 113, the gap adjusting device 160 finely controls the gap between the rollers by the controller. Maintain greater than the thickness of the substrate. In this way, the substrate 106 enters between both rollers while the gap between the rollers is larger than the thickness of the substrate.

After the substrate 106 has entered between both rollers, the spacing between both rollers is kept slightly less than the thickness of the substrate. While the gap between both rollers is kept slightly smaller than the thickness of the substrate, a light scattering pattern is formed on the substrate 106 by the stamper 100 attached to the first pressure roller 303.

In addition, after all the light scattering patterns are formed on the substrate 106, the distance between the two rollers is kept larger than the thickness of the substrate, and the substrate 106, that is, the light guide plate 106 'is discharged between the two rollers.

Thereafter, the light guide plate 106 ′ is transferred to the unloading device 104 by the transfer device 109, and the unloading device 104 loads the light guide plate into the second loading box 110.

2A-2F and 3, the operation of the spacing device 160, 161 will be described in detail.

As shown in FIG. 2A, a substrate 106 having a length L and a thickness T1 is conveyed by the conveying device at a speed v. When each radius is r and the center line connecting the rotational axes of both pressure rollers is C, the interval T is the distance between both pressure rollers at the center line C. The distance D1 is the distance between the detector 150 and the centerline of both pressing rollers.

When the first pressure roller 103 and the second pressure roller 113 rotate at an angular velocity w = v / r, respectively, the controller receiving the detection signal of the detector 150 controls the gap adjusting devices 160 and 161. The first pressure roller 103 moves the second pressure roller 113 so that the distance T between the first pressure roller 103 and the second pressure roller 113 is increased to T3 (T3> T1). (See FIG. 2B.) At this time, if the distance between the two pressure rollers is already T3 due to the continuous transfer of the substrate, it may be simply maintained.

After a predetermined time t1 elapses after the entrance surface of the substrate 106 is detected by the detector 150, the entrance surface of the substrate 106 reaches a centerline portion connecting the rotation axes of both pressing rollers as shown in FIG. 2C. . The distance D1 between the detector 150 and the centerline of both the pressing rollers is set at v? T1. After the substrate 106 is detected by the detector 150, the time t1 elapses so that the entry surface of the substrate 106 reaches the centerline portion of both the pressure rollers 103 and 113, and the controller again controls the interval between the two pressure rollers. The gap adjusting devices 160 and 161 are controlled to be T2 smaller than the substrate thickness T1.

As shown in FIG. 2D, when the gap adjusting devices 160 and 161 allow the gap between the two pressure rollers to be T2, the substrate (after the gap adjusting time t2 of the gap adjusting devices 160 and 161 has elapsed) At 106, light scattering patterns begin to form. In other words, the pattern starts to form from the distance D2 (D2 = v? T2) away from the substrate entry surface, thereby eliminating the phenomenon that the edge of the substrate entry surface hits both pressure rollers, thereby preventing substrate and metal stamper contamination. have.

When the substrate 106 is formed by the pressing rollers 103 and 113 and continues at the traveling speed v, and the substrate exit surface is detected by the detector 150 as shown in FIG. 2E, the control unit controls the predetermined time t3 (t3 = t1-). After t2), the space | interval adjusting apparatus 160, 161 is controlled so that the space | interval T between both pressure rollers may become T3 from T2, and the space | interval between both pressure rollers will open for time t2, and it will become T3 from space | interval T2. Therefore, as shown in FIG. 2F, the distance between the two pressing rollers starts to be widened from the distance D3 (D3 = v? T2) from the exit surface of the substrate 106, so that the exit surface of the substrate 106 is between the two pressing rollers. When passing out, the distance between both pressure rollers becomes T3. Therefore, the phenomenon that the edge of the exit surface of the substrate hits the pressure roller can be eliminated, thereby preventing contamination of the substrate and the stamper.

3 graphically shows the relationship between the interval T and the time between both pressing rollers. In addition, in the present embodiment, it has been described that the gap adjusting device 160 widens the gap between the pressurizing rollers as the detector 150 detects the exit surface of the substrate 106, but the substrate is not detected without detecting the exit surface of the substrate. It is also possible to change only by widening the space | interval between both press rollers after predetermined time elapses after detecting only the entrance surface of.

The interval adjusting device employed in the embodiment of the present invention can be implemented in various modifications in the above-described embodiment. Another example of the spacing device is as follows.

Referring to FIG. 4, an example of the gap adjusting devices 260 and 261 for adjusting the gap between the first pressure roller 103 and the second pressure roller 113 is illustrated. The gap adjusting devices 260 and 261 are formed with wedge-shaped first gap adjusting bars 265 and second gap adjusting bars 266 respectively connected to the first pressure roller 103 and the second pressure roller 113, respectively. It consists of a first drive unit 263 and a second drive unit 264 for driving the gap adjusting bar (265, 266) of the left and right. Each of the gap adjusting bars 265 and 266 is made of a wedge shaped bar, and the respective pressure rollers are connected to the inclined surface of the wedge shape. Limiting the horizontal movement of each pressure roller and allowing only vertical movement allows both pressure rollers to move up and down along the inclined plane when the gap adjusting bar moves in the horizontal direction, thereby changing the distance between the pressure rollers. have.

5A-5F, the operation of the gap adjusting device 260 will be described in detail. In FIG. 5A, when the detector 150 detects the entrance surface of the substrate 106, the controller receiving the detection signal of the detector 150 drives the first driving device 263 and the second driving device 264. The first spacing bar 265 and the second spacing bar 266 are moved and the spacing between both pressing rollers is made a spacing T3 greater than the substrate thickness T1. In Fig. 5B, the entry surface of the substrate 106 reaches the center line of both the pressure rollers 103 and 113. (time t1 elapses after the entrance surface detection)

As shown in FIG. 5C, when the entrance surface of the substrate 106 crosses the centerline of both pressing rollers 103 and 113, the controller again adjusts the first interval so that the interval between the pressing rollers is T2 smaller than the substrate thickness T1. The bar 265 and the second gap adjusting bar 266 are pushed to the left in the drawing (time t2 has elapsed). In other words, the light scattering pattern starts to be formed on the substrate after the time t2 when the interval between the two pressure rollers is adjusted from T3 to T2.

In FIG. 5D, when the exit surface of the substrate is detected by the detector 150, after the predetermined time t3 (t3 = t1-t2) has elapsed, the control unit sets the interval T between both pressing rollers to be T3 to T3 as shown in FIG. 5E. The gap adjusting bars 265 and 266 are moved to the right by controlling the driving devices 263 and 264. When the exit surface of the substrate 106 exits between the two pressure rollers, the distance between the two pressure rollers becomes T3, so that the phenomenon that the edge of the exit surface of the substrate strikes the pressure roller can be eliminated. Contamination can be prevented.

With reference to FIG. 6, another example of the space adjusting device for adjusting the space | interval between a 1st pressure roller and a 2nd pressure roller is demonstrated.

The spacing adjuster 360 of FIG. 6 includes a first spacing adjuster 360 and a second spacing adjuster 361, and the first spacing adjuster 360 is connected to the first pressure roller 103. 1 cam 309 and the 1st cam drive device 311 which drives rotation of the 1st cam 309. As shown in FIG. Similarly, the second gap adjusting device 361 includes a second cam 310 connected to the second pressure roller 113 and a second cam driving device 312 for driving rotation of the second cam 310. Each of the cams 309 and 310 includes a portion of which the radius changes in a certain portion, and the cams are designed to be connected to the respective pressure rollers 103 and 113 so as to adjust the gap between both the pressure rollers when the cam is rotated. Can be.

With reference to FIGS. 7A-7E, the operation of the spacing device 360, 361 will be described in detail. In FIG. 7A, when the detector 150 detects the entrance surface of the substrate 106, the controller receiving the detection signal of the detector 150 drives the first cam driving device and the second cam driving devices 311 and 312. The first cam 309 and the second cam 310 are rotated to make the interval between the two pressing rollers an interval T3 larger than the substrate thickness T1.

As shown in FIG. 7B, the entry surface of the substrate 106 reaches the centerline of the both pressure rollers 103 and 113 (time t1 elapses after the entry surface detection), and as shown in FIG. The first cam 309 and the second cam 310 are rotated so that the distance between the substrates is T2 smaller than the substrate thickness T1 (time t2 has elapsed). In other words, the light scattering pattern starts to be formed on the substrate after the time t2 when the interval between the two pressure rollers is adjusted from T3 to T2.

When the exit surface of the substrate is detected by the detector 150 as shown in FIG. 7D, the control unit causes the cam drive device so that the interval T between both pressing rollers becomes T3 to T3 after a predetermined time t3 (t3 = t1-t2) has elapsed. The cams 309 and 310 are rotated by controlling the 311 and 312. As shown in FIG. 7E, when the exit surface of the substrate 106 passes through the two pressure rollers, the distance between the two pressure rollers becomes T3, thereby eliminating the phenomenon that the edge of the substrate exits the pressure roller. Therefore, contamination of the substrate and the stamper can be prevented.

Although the technical features of the present invention have been described with reference to specific embodiments, those skilled in the art to which the present invention pertains may make various changes and modifications within the scope of the technical idea according to the present invention. It is obvious. For example, it is possible to partially change the shape, driving method, etc. of a space adjusting device, or to provide a roller space adjusting device only in either one of two pressure rollers. In addition, the position and quantity of the detector for detecting the movement of the substrate may be changed or the detector may be implemented in various forms.

Light guide plate substrate: 106, Light guide plate: 106 '
Feeder: 105, 109
1st pressure roller: 103, 2nd pressure roller: 113
Guide roller: 107, Detector: 150
Spacer: 160, 161, 260, 261, 360, 361
Stamper: 100, Heating device: 108
First Spacing Bar: 265, Second Spacing Bar: 266
1st drive: 263, 2nd drive: 264
1st cam: 309, 2nd cam: 310
1st cam drive device: 311, 2nd cam drive device: 312

Claims

An apparatus for manufacturing a light guide plate having a light scattering pattern,
A transfer device for transferring the light guide plate substrate having a predetermined thickness;
A detector for detecting movement of the substrate to be transferred;
A pair of pressure rollers which are installed to face each other at a predetermined interval so as to press the substrate conveyed by the transfer device up and down;
A stamper attached to at least one of the pair of pressure rollers and having a light scattering pattern formed thereon; And
A gap adjusting device, connected to at least one of the pair of pressure rollers, for adjusting a gap between the pressure rollers;
Including,
The gap adjusting device maintains the gap greater than the thickness of the substrate at the portion where the movement of the substrate detected by the detector starts, maintains the thickness smaller than the thickness of the substrate at the middle portion, and increases the thickness of the substrate at the end portion. Light guide plate manufacturing apparatus for adjusting the interval to maintain.

The method of claim 1,
The gap adjusting device is a light guide plate manufacturing apparatus, characterized in that driven by a device for rotating or reciprocating motion.

The method of claim 1,
The gap adjusting device
A wedge-shaped gap adjusting bar whose inclined surface is horizontally connected to the pressure roller to move the pressure roller up and down when moved in a horizontal direction; And
A driving device for transmitting power to move the gap adjusting bar in a horizontal direction;
Light guide plate manufacturing apparatus comprising a.

The method of claim 1,
The gap adjusting device
A cam connected to the pressure roller and including a portion of which a radius is changed at a predetermined portion according to rotation, to move the pressure roller up and down; And
Cam drive device for driving the rotation of the cam
Light guide plate manufacturing apparatus comprising a.

The method of claim 1,
The detector is a light guide plate manufacturing apparatus comprising a light emitting part and a light receiving part.

The method according to any one of claims 1 to 5,
The light scattering pattern of the stamper is made of a concave-convex pattern, the height of the concave-convex light guide plate manufacturing apparatus, characterized in that 20 μm or less.

The method according to any one of claims 1 to 5,
And the gap adjusting device adjusts the gap in accordance with a substrate traveling time from the time when the detector detects the movement of the substrate.

The method according to any one of claims 1 to 5,
The gap adjusting device
The interval is maintained larger than the thickness of the substrate for a predetermined time from the time when the entrance surface of the substrate enters the center line connecting the rotation axis of the pair of pressure rollers,
After the predetermined time the gap is kept smaller than the thickness of the substrate,
And maintaining the gap greater than the thickness of the substrate for a predetermined time before the exit surface of the substrate crosses the center line.

A light guide plate manufacturing method using a pair of pressure rollers provided to face each other at a predetermined interval to form a light scattering pattern on a substrate,
Transferring the light guide plate substrate;
Detecting movement of the substrate;
Passing the substrate through a pair of pressure rollers to form a light scattering pattern on a surface of the substrate;
Including,
The pattern forming step
A first spacing adjusting step of maintaining the spacing greater than the thickness of the substrate when the movement of the substrate detected in the detecting step starts;
A second gap adjusting step of maintaining a thickness smaller than the thickness of the substrate in the middle portion;
A third gap adjusting step of maintaining the end portion larger than the thickness of the substrate;
Light guide plate manufacturing method comprising a.

10. The method of claim 9,
At least one of the pair of pressure rollers is attached with a stamper having a light scattering pattern,
The light scattering pattern of the stamper is made of a concave-convex pattern, the height of the concave-convex light guide plate manufacturing method, characterized in that 20 μm or less.

10. The method of claim 9,
In the first to third interval adjustment step, the light guide plate manufacturing method characterized in that to maintain the gap by driving at least one of the pressure roller of the pair of pressure rollers.

10. The method of claim 9,
The first to third interval adjustment step is a light guide plate manufacturing method for adjusting the interval in accordance with the substrate running time from the time of detecting the movement of the substrate in the detection step.

10. The method of claim 9,
And detecting the entrance or exit surface of the substrate in the detection step.

The method according to any one of claims 9 to 13,
The first interval adjusting step is performed for a predetermined time from the time when the entry surface of the substrate enters the center line connecting the rotation axis of the pair of pressure rollers,
The second interval adjustment step is performed after the first interval adjustment step,
And the third gap adjusting step is performed for a predetermined time before the exit surface of the substrate passes the center line.