JP2002258019A - Optical sheet, system for manufacturing optical sheet, device for cutting optical sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical sheet in which a joined part causes optical influences as little as possible. SOLUTION: The optical sheet to be used for a screen where images from an image projecting device are projected is manufactured by joining a plurality of optical sheet members 6 with an adhesive 7 on the end faces of the members as the joining faces. Each sheet member 6 consists of lenticular lenses (having peaks 6d and valleys 6e) which are in thin and long forms along a second direction with some waves and which are arranged in a first direction perpendicular to the second direction so as to periodically change the optical characteristics in the first direction. The optical sheet members 6 to be joined are selected in such a combination that the wavy forms are almost the same or symmetrie with respect to the joined face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical sheet formed by joining a plurality of optical sheet members, an optical sheet manufacturing system for manufacturing the optical sheet, and an optical sheet cutting apparatus.

[0002]

2. Description of the Related Art An optical sheet such as a lenticular sheet or a Fresnel lens sheet is used, for example, as an optical screen on which an image from an image projection device is projected. Such an optical screen tends to be larger in size so that an image can be observed on a large screen, and accordingly, an optical sheet having a larger area is required.

[0003] Among such optical sheets, for example, a lenticular sheet has a structure in which semi-cylindrical protrusions are continuously arranged on the surface, and a large number of transparent resin materials heated and softened are provided on the peripheral surface. Is formed by pressing a semi-cylindrical female mold with a roll-shaped member engraved.

However, since a considerable pressure must be applied to form a thin lenticular sheet, if the width is increased while maintaining the thinness, the necessary pressure becomes too large, and the manufacturing apparatus becomes too large. Has to be extremely rigid, resulting in high manufacturing costs.

Therefore, a technique has been developed for forming a large-area lenticular sheet at low cost by joining lenticular sheets of a predetermined width.

One example of such a screen is disclosed in Japanese Utility Model Laid-Open Publication No. 64-23042, which is a transmission screen in which a plurality of transparent or translucent resin sheets are bonded, and the plurality of resin sheets are bonded together. However, there is described a transmission screen that is formed via a resin layer having optical characteristics substantially equal to the resin sheet. More specifically, the resin sheet is a lenticular sheet, and bonding of the sheet is performed at a valley portion. It has been done.

[0007]

However, as described above, the lenticular sheet is formed by rotating the roll-shaped member while applying pressure. It is inevitable that subtle undulations occur in the surface shape formed by the repetition of valleys.

[0008] If the lenticular sheets having such undulations are joined together as they are, the mismatch due to the undulations has an optical effect, and the joined portions are observed in a streak shape.

In view of the above, there is a need for a technique for minimizing the optical influence in consideration of such undulations in the optical sheet.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical sheet in which a joint portion has as little optical influence as possible.

Another object of the present invention is to provide an optical sheet manufacturing system suitable for manufacturing an optical sheet in which a joint portion does not exert an optical influence as much as possible.

Further, the present invention provides an optical sheet cutting apparatus capable of cutting an optical sheet member so as to be suitable for performing a joining in which a joining portion does not exert an optical influence as much as possible. The purpose is.

[0013]

To achieve the above object, an optical sheet according to a first aspect of the present invention is an optical sheet adapted to be used on a screen on which an image from an image projection device is projected. The optical characteristics are periodically changed along the main surface in a first direction, and are substantially the same in a second direction orthogonal to the first direction. Comprises substantially the same optical sheet member in which undulation is present in the second direction.
The optical sheet is configured by joining the plurality of optical sheet members to each other with an end surface substantially orthogonal to the main surface as a joining surface, and one optical sheet member joined at the joining surface. The other optical sheet members are configured by synchronizing the phases of the undulations so that the optical characteristics at the bonding surface are substantially the same within a predetermined allowable range.

The optical sheet according to a second aspect of the present invention is the optical sheet according to the first aspect, wherein the periodically changing optical characteristic is provided on the surface along the main surface of the optical sheet member. The unevenness in the height direction perpendicular to
Are obtained by forming periodically in the direction of.

Further, the optical sheet according to the third aspect of the present invention comprises:
In the optical sheet according to the first aspect, the magnitude of the waviness is within two pitches when the basic period of the change in the optical characteristics in the first direction is one pitch.

The optical sheet according to a fourth aspect of the present invention is characterized in that
In the optical sheet according to the invention, when the bonding of the plurality of optical sheet members sandwiches a transparent adhesive between the bonding surfaces of each other, and the basic period of the change in the optical characteristics in the first direction is one pitch. Then, the transparent adhesive is applied to a surface along the main surface within a range of 1 pitch or more and 5 pitches or less from the bonding surface, and is cured.

An optical sheet according to a fifth aspect of the present invention is the optical sheet according to the first aspect.
In the optical sheet according to the invention, the bonding surface of the optical sheet member is configured such that the surface roughness is Rmax 0.8S or less, and the bonding of the plurality of optical sheet members includes:
This is achieved by sandwiching a transparent adhesive between the joining surfaces and curing the adhesive.

An optical sheet according to a sixth aspect of the present invention is the optical sheet according to the first aspect.
In the optical sheet according to the invention, the predetermined allowable range in which the optical characteristics at the bonding surfaces are considered to be substantially the same is within 50% of the periodic change amount of the optical characteristics.

The optical sheet according to the seventh aspect is the optical sheet according to the second aspect.
In the optical sheet according to the invention, the predetermined allowable range in which the optical characteristics on the bonding surface are considered to be substantially the same as each other, the shift amount in the height direction between the surfaces of the optical sheet members on the bonding surface is This range is within 50% of the amplitude of the periodic unevenness.

The optical sheet according to an eighth aspect is the optical sheet according to the first aspect.
In the optical sheet according to the invention, by combining optical sheet members having undulations in substantially the same direction with respect to the bonding surface, the undulation of the undulations is substantially the same within the predetermined allowable range. The phases are synchronized.

The optical sheet according to the ninth aspect is the optical sheet according to the first aspect.
In the optical sheet according to the invention, by combining optical sheet members having undulations in a substantially symmetrical direction with respect to the bonding surface, the undulations of the undulations are substantially the same within the predetermined allowable range. The phases are synchronized.

An optical sheet manufacturing system according to a tenth aspect of the present invention is an optical sheet cutting apparatus for cutting an optical sheet to form an edge suitable for joining, and a plurality of the cut optical sheets, suitable for joining the optical sheets. An optical sheet joining device that joins at an edge, a storage device that stores at least one of an optical sheet cut by the optical sheet cutting device and an optical sheet joined by the optical sheet joining device, and the optical sheet cutting device A transport device that transports the optical sheet between the optical sheet joining device and the storage device, and a control device that controls the optical sheet cutting device, the storage device, the optical sheet joining device, and the transport device It is.

An optical sheet cutting apparatus according to an eleventh aspect of the present invention mounts an optical sheet to be cut, and can adjust a slide position and a rotation position along a main surface of the mounted optical sheet. A mounting table configured to
An exploration device for exploring the surface shape of the optical sheet to determine a cutting line of the optical sheet mounted on the mounting table,
A cutting blade for cutting the optical sheet, a cutting drive source for driving the cutting blade at the same cutting position, and a feed driving source for moving the cutting position by the cutting blade are provided. Then, the slide path and the rotational position of the optical sheet are adjusted by the mounting table so that the moving path of the cutting blade by the feed driving source coincides with the cutting line determined based on the search by the search device, The optical sheet is cut by moving the cutting blade along the cutting line by the feed driving source while driving the cutting blade by the cutting drive source.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 22 show an embodiment of the present invention. FIGS. 1 to 3 relate to an optical sheet manufacturing system, FIGS. 4 to 10 relate to an optical sheet cutting apparatus, and FIGS. 11 to 17. 18 to 22 relate to an optical sheet bonding apparatus, and FIGS. 18 to 22 are drawings relating to an optical sheet.

First, the overall configuration and operation of the optical sheet manufacturing system will be described with reference to FIGS. 1 is a block diagram illustrating a configuration of an optical sheet manufacturing system, FIG. 2 is a block diagram illustrating a configuration when the optical sheet manufacturing system is installed in a temperature / humidity control clean booth,
FIG. 3 is a flowchart showing the operation of the optical sheet manufacturing system.

As shown in FIG. 1, this optical sheet manufacturing system includes an optical sheet member 6 (FIG. 4A, FIG. 4A) formed by sandwiching a transparent resin material between roll-shaped members.
(B) etc.), an optical sheet cutting device 1 that cuts the sheet so as to be suitable for joining at a later stage, and an optical sheet joining device that stores the optical sheet member 6 cut by the optical sheet cutting device 1 and that will be described later. And an optical sheet joining apparatus 3 for joining the plurality of optical sheet members 6 conveyed from the storage apparatus 2 to produce an optical sheet having a larger area.
And a workstation 4 which is a control device for controlling each of these devices, and is provided between the optical sheet cutting device 1 and the storage device 2 and between the storage device 2 and the optical sheet joining device. The optical sheet member 6 and the optical sheet are transported between the apparatus 3 and a transport device as a transport device.

FIG. 2 shows a path through which the optical sheet member 6 and the optical sheet are circulated, ie, the optical sheet cutting device 1 in the optical sheet manufacturing system as described above.
And the storage device 2 and the optical sheet bonding device 3 and the transport route by the transport device connecting them so that the number of dusts per unit volume in the air at a predetermined temperature and a predetermined humidity is equal to or less than a predetermined value. It is installed in a temperature and humidity control clean booth 5 which is a maintained environment control area.

The optical sheet member 6 used in such an optical sheet manufacturing system is formed in a thin sheet made of a material such as acryl, for example, and may expand or contract in accordance with temperature or humidity. In addition, since it is easy to be charged with electricity and dust and the like in the air easily adhere to the optical sheet member 6, it is installed in such a temperature and humidity control clean booth 5 to prevent expansion and contraction and adhesion of dust and the like. Is manufactured with high precision so that the optical performance can be maintained.

Next, a flow of manufacturing an optical sheet by such an optical sheet manufacturing system will be described with reference to FIG.

When the production line starts operating, the workstation 4 first obtains information from the optical sheet cutting device 1, the storage device 2, the optical sheet joining device 3, the respective transporters, and the like (step S1). Are instructed to start cutting (step S).
2).

The optical sheet cutting device 1 waits for a message indicating that the cutting has been completed from the optical sheet cutting device 1 (step S3). Such information is obtained (step S4).

The information obtained at this time is, for example, when the optical sheet member 6 is a lenticular sheet, information indicating whether the both ends are aligned with each other between the peaks or the valleys or cut. When the surface of the lenticular sheet has undulation, information indicating the size and direction of the undulation may be used.

Then, the workstation 4 assigns a serial number or the like to the cut optical sheet member 6 (step S5), associates the acquired information with the serial number, and stores the information in its own built-in storage means. Keep it.

Thereafter, the transfer device is instructed to transfer the cut optical sheet member 6 to the storage device 2 (step S6), and information on the storage position and the like at the time of storage is transmitted from the storage device 2. Obtain (step S7).

When a plurality of cut optical sheet members 6 are stored in the storage device 2 in this manner, the workstation 4 associates the optical sheet members 6 with the serial numbers assigned to the respective optical sheet members 6. The shape of the optical sheet member 6 is analyzed based on the stored information (step S8), and a combination of the optical sheet members 6 most suitable for joining is determined (step S9). At this time, in the case of the lenticular sheet as described above,
Cuts with both ends aligned to the peak or cuts with both ends aligned to the valley are selected as a combination of joints. So that it cannot be combined with the cut one that has been aligned. Further, the undulation of the surface shape of the lenticular sheet is also set to an appropriate combination as described later.

Then, it is instructed to retrieve the optical sheet member 6 of the determined combination from the storage device 2 (step S10), and the retrieved optical sheet member 6 is transported by the transporter to the optical sheet joining device 3 (step S10). Step S11),
The optical sheet joining apparatus 3 is instructed to start joining (step S12).

Thereafter, the apparatus waits for a message to the effect that bonding has been completed from the optical sheet bonding apparatus 3 to be notified (step S13). (Step S
14) A serial number or the like is assigned to the optical sheet (step S15), and the information obtained in step S14 is stored in association with the serial number.

Then, the conveying device is instructed to convey the bonded optical sheet (step S16), and the storing device 2
After that, information such as a storage position in the storage device 2 is acquired from the storage device 2 and stored (step S1).
7), end.

Next, a detailed configuration of the optical sheet cutting device will be described with reference to FIGS. FIG.
5 is a plan view and a front view showing the configuration of the optical sheet cutting device, FIG. 5 is a flowchart showing the operation of the optical sheet cutting device, FIG. 6 is a diagram showing the configuration of the cooling liquid supply device in the optical sheet cutting device, and FIG. FIG. 8 is a front view including a partial cross-section showing the configuration of a base temperature control device for maintaining the temperature of the mounting table in the sheet cutting device at a predetermined temperature. FIG. 8 shows the optical sheet cutting device installed in a temperature and humidity management clean booth. FIG. 9 is a front view showing an example of a configuration when the mounting table of the optical sheet cutting device has an anti-vibration structure, and FIG. 10 is a diagram showing a case where a suction fixing device is provided on a rotating plate of the optical sheet cutting device. It is sectional drawing which shows a structure of.

First, as described above, the optical sheet member 6 to be cut by the optical sheet cutting apparatus 1 is made of a transparent resin material heated and softened, and a lenticular female mold formed on the peripheral surface. It is formed by applying pressure by a cut-out roll-shaped member, and the shape of its edge is not often a shape suitable for joining. Accordingly, the edge of the optical sheet member 6 is cut by the optical sheet cutting device 1 to form a bonding surface suitable for bonding at a later stage.

That is, this optical sheet cutting device 1
A mounting table for mounting the optical sheet member 6 to be cut is provided, and the mounting table includes a base 11 serving as a base.
And a moving plate 12 placed on the base 11
And a rotating plate 13 mounted on the moving plate 12 for mounting the optical sheet member 6 thereon.

The moving plate 12 is guided by a rail member (not shown) or the like, and is slid in the vertical direction in FIG. 4A, for example.

The sliding direction driving means 21 includes, for example, a pressing portion 21a which can be freely moved in and out, and is applied to, for example, the center of the upper edge of the moving plate 12 which is urged upward in FIG. In addition, the slide position is adjusted by changing the in / out position.

The rotating plate 13 rotatably supports the rotating plate 13 so as to be rotatable and is driven by a rotating direction driving means 22 to rotate around a rotating pin 13 a fixed to the moving plate 12. It is to be moved.

The rotation direction driving means 22 is provided with, for example, a pressing portion 22a which can be freely moved in and out.
The rotating arm 13 is biased clockwise, for example, in FIG. 4A, and engages with an engaging arm 13b protruding from a corner of the rotating plate 13 opposite to the rotating pin 13a. The rotational position is adjusted by changing the position.

After the optical sheet member 6 is placed on the rotating plate 13, the position on the rotating plate 13 is fixed by being pressed by a fixing member 14 such as a pressing plate. It has become so.

The base 11 is provided with, for example, two rail members 23 along the cutting direction. The slide unit 15 having a wheel-type cutter 16 as a cutting blade for cutting the optical sheet member 6 is provided. Along the rail member 23, it is guided in the thrust direction.

The slide unit 15 has a built-in rotary motor as a cutting drive source and a feed motor as a feed drive source (not shown).
The wheel type cutter 16 is attached.

The wheel type cutter 16 has a cutter surface formed of diamond abrasive grains having much higher hardness and strength than general abrasive grains, or cubic boron nitride (CBN: cubic boron nitride) abrasive grains. Yes,
For example, 3000 motors by a rotary motor as a driving source for cutting.
The rotation is performed at a rotation speed of not less than rpm and not more than 30,000 rpm. Thereby, a cut surface having a low surface roughness suitable for joining, for example, a surface roughness of Rmax 0.8S
It is possible to obtain the following cut surfaces.

The feed motor moves the slide unit 15 itself along the rail member 23. Specifically, a gear rotated by the feed motor is mounted on the mounting portion of the base 11. 24a meshes with a feed shaft 24 fixed at both ends to the rail member 23.
Is moved in the direction of.

The positional relationship between the wheel-type cutter 16 of the slide unit 15 and the optical sheet member 6 is a search device attached to the slide unit 15 and adapted to move together with the slide unit 15. Camera 17 for observing the upper surface, which is a device, and a camera for observing the cross section, which is an exploration device provided on the base 11 on the base end side and the terminal end side in the direction in which the wheel-type cutter 16 advances, and an imaging device for a cut surface. 18,
19, information is acquired by imaging.

The images picked up by these cameras 17, 18, 19 are displayed on a monitor device 2 as shown in FIG.
5 and can be observed by the operator. Images captured by these cameras 17, 18, and 19 are subjected to image processing for grasping the surface shape of the optical sheet member 6, and then transmitted to the workstation 4 for use in shape analysis. Can also be.

Next, the operation of the optical sheet cutting apparatus 1 will be described with reference to FIG.

When the operation is started, first, the optical sheet member 6 is placed on the rotating plate 13 (step S2).
1). This operation may be performed by an operator, but in order to achieve further automation, it is preferable that the operation is automatically carried out by the above-described transporter or the like. In this case, according to the instruction from the workstation 4,
A series of linked operations will be controlled.

Next, the images captured by the camera 17 for observing the upper surface and the cameras 18 and 19 for observing the cross-section are displayed on the monitor device 25 or transmitted to the workstation 4 to acquire information. Is performed (step S22). The image processing and the like in order to grasp the surface shape of the optical sheet member 6 may be performed by the optical sheet cutting device 1 itself, or may be performed on the workstation 4 side.

It is determined from the acquired image information whether the optical sheet member 6 is at a predetermined position suitable for cutting (step S23). The predetermined position is the optical sheet member 6.
Is a lenticular sheet, the base end and the end of the cutting line, the concave and convex shape of the lenticular, refers to the case where the peaks related to the same convex, or the valleys related to the same concave are located. I have.

In step S23, when the moving plate 12 is not at the predetermined position, the moving plate 12 is slid by the sliding direction driving means 21 (step S23).
24) The rotating plate 13 is rotated by the rotating direction driving means 22 (step S25), and adjusted to be at a predetermined position.

Thus, at the predetermined position,
The rotary motor is driven to rotate the wheel-type cutter 16, and the feed motor is driven to move the slide unit 15 along the rail member 23 by meshing with the feed shaft 24 (step S26).

Then, it waits until the optical sheet member 6 is completely cut to the end of the cutting line (step S2).
7) When the end of the cutting is confirmed, the operation of the optical sheet cutting apparatus 1 is ended.

When the wheel type cutter 16 is rotated to cut the optical sheet member 6, heat is generated due to friction during rotation. As described above, the optical sheet member 6 is formed of, for example, acrylic or the like. When heat is generated, the optical sheet member 6 expands and contracts or softens, so that accurate cutting cannot be performed. Therefore, as shown in FIG.
Using the coolant supply device 31, the wheel type cutter 16
Further, it is preferable to cool the cut portion of the optical sheet member 6.

A coolant supply pipe 31a is connected to the coolant supply device 31.
b is provided. Then, from this discharge port 31b,
The cooling liquid supplied from the cooling liquid supply device 31 is sprayed onto the wheel-type cutter 16 and the optical sheet member 6 to cool them.

The cooling liquid discharged and used for cooling in this way travels along the slope 33, is recovered by the cooling liquid recovery pipe 31c, is returned to the cooling liquid supply device 31, and is used again. I have.

As described above, since the optical sheet member 6 expands and contracts depending on the temperature, it is not desirable that the temperature of the cooling liquid is too high or too low. Therefore, in the cooling liquid supply device 31, a liquid temperature adjusting device 32 for maintaining the temperature of the cooling liquid at a predetermined temperature is provided.

Such a cooling liquid is used not only for cooling the generated heat but also for making the cut surface of the wheel-type cutter 16 smoother.

Next, a structure for maintaining the temperature of the base 11 constant will be described with reference to FIG.

As described above, since the optical sheet member 6 expands or contracts unless it is maintained at a constant temperature, it is desirable that the temperature of the mounting table on which the optical sheet member 6 is mounted is also maintained at a constant temperature. .

Therefore, the temperature is maintained at a constant level by circulating a medium for temperature adjustment in, for example, the base 11 in the mounting table.

That is, the base temperature adjusting device 34 supplies the medium from the medium supply pipe 34a, passes the medium through the medium flow path 11a formed in the base 11, and recovers the medium from the medium recovery pipe 34b. It has become.

A medium temperature adjusting device 35 for maintaining the medium at a predetermined temperature, similar to the liquid temperature adjusting device 32, is also provided in the base temperature adjusting device 34.

By keeping the temperature of the base 11 constant as described above, the temperature of the rotating plate 13 with which the optical sheet member 6 is in direct contact is also kept constant. And it can be cut accurately.

Next, FIG. 8 shows the optical sheet cutting apparatus 1 described above.
The whole is installed in the temperature and humidity control clean booth 5 as described above, and it is possible to install only the optical sheet cutting device 1. However, as shown in FIG. May be installed together with the above device.

As a result, more stable overall temperature control becomes possible, and it is also effective to prevent dust and the like in the air from adhering to the optical sheet member 6.

FIG. 9 shows an example in which the optical sheet cutting device 1 has an anti-vibration structure. In this example,
An anti-vibration table 36 made of rubber, spring, or the like is provided below the base 11.

With such a configuration, even if there is a road on which a large truck or the like runs, for example, near the manufacturing plant, the optical sheet member 6 can be cut accurately without being affected by the vibration. Becomes possible.

FIG. 10 shows a configuration in which a suction fixing device is provided on the rotating plate 13 of the optical sheet cutting device 1.

The optical sheet member 6 is fixed to the rotating plate 13 by using a fixing member 14. More preferably, the optical sheet member 6 is preferably in close contact with the rotating plate 13 while securing sufficient flatness.

Therefore, as shown in FIG. 10, a plurality of suction holes 13c are formed in the surface of the rotary plate 13 on which the optical sheet member 6 is placed, and these suction holes 13c are formed.
A ventilation hole 13d communicating with the inside is provided inside, and the air is sucked by a suction pump 37 through a pipe 37a.

With this configuration, more accurate cutting can be performed.

Next, a detailed configuration of the optical sheet bonding apparatus will be described with reference to FIGS. FIG. 11A is a plan view showing the configuration of the optical sheet bonding apparatus,
FIG. 12B is a front view, FIG. 12C is a partially enlarged view, FIG. 12 is a side view showing a flow when the optical sheet members are joined by the optical sheet joining apparatus, and FIG. 13 is a flowchart showing the operation of the optical sheet joining apparatus. 14 shows a configuration when the optical sheet bonding apparatus is installed in a temperature and humidity control clean booth, (A) a plan view, (B) a front view, (C) a partially enlarged view, FIG.
5 is a front view showing an example of a configuration when the optical sheet bonding apparatus has an anti-vibration structure, and FIG. 16 shows a configuration when a suction fixing apparatus is provided on at least one of a fixed plate and a movable plate in the optical sheet bonding apparatus. FIG. 17 is a cross-sectional view showing an example of the configuration of an optical sheet joining apparatus for sequentially joining elongated optical sheet members.

The optical sheet member 6 cut by the optical sheet cutting device 1 as described above is joined by the optical sheet joining device 3.

That is, this optical sheet bonding apparatus 3
Fixing plate 41 for placing one optical sheet member 6
And the placed optical sheet member 6 with the fixing plate 4
1 and a movable plate 42 on which another optical sheet member 6 is placed.
And the optical sheet member 6 placed on the movable plate 4
2 for adhering the fixing member 44 such as a pressing plate or the like to the one optical sheet member 6 and the other optical sheet member 6. The adhesive 7 extends from the base end to the end of the end face 6c.
(See FIG. 12).

The movable plate 42 is configured to be guided by a guide member 47 so as to be movable toward or away from the fixed plate 41.

A rail member 45 is attached to the fixed plate 41.
The bonding unit 51 is provided with the rail member 4.
5 as a moving mechanism for moving the bonding unit 51.
For example, a gear rotated by a feed motor provided in the bonding unit 51 meshes with a feed shaft 46 having both ends fixed to the fixed plate 41, and
5 is moved.

Further, on the fixed plate 41, the base end side and the end side in the moving direction of the adhesive unit 51 are
Cross-section observation cameras 48 and 49 for observing the joint surface are provided.

Further, the bonding unit 51 prevents the electrification of the two optical sheet members 6 to be joined together with the upper surface observation camera 53 as an image pickup device for observing the joining portion from the upper side. Antistatic treatment device 5 for performing
4, a dispenser 55 for discharging the adhesive 7 to an end face 6c serving as a bonding surface of the optical sheet member 6 fixed to the fixing plate 41, and an adhesive sandwiched between the two optical sheet members 6. 7, an adhesive suction device 56 for sucking the protruding portion of 7, a curing light 57 for curing the adhesive 7, a warm air device 58 for promoting the joining of the two optical sheet members 6, Is configured.

Further, the images picked up by the cameras 48, 49, 53 are output to the monitor device 52,
It can be observed by an operator. The images taken by these cameras 48, 49, 53 are also sent to the workstation 4 as joining information.

Next, the operation of the optical sheet bonding apparatus 3 will be described with reference to FIGS.

When the operation is started, first, the two optical sheet members 6 are placed on the fixed plate 41 and the movable plate 42 (step S31). This operation may be performed by the operator, as described above. However, in order to achieve further automation, it is preferable that the operation is automatically performed by the transfer device or the like. In this case, according to the instruction from the workstation 4,
A series of linked operations will be controlled.

Next, information obtained by displaying images captured by the camera 53 for observing the upper surface and the cameras 48 and 49 for observing the cross section on the monitor device 52 or transmitting the image to the workstation 4 is obtained. Is performed (step S32).

Then, based on this information, it is determined whether each optical sheet member 6 is at a predetermined position suitable for joining on the fixed plate 41 and the movable plate 42 (step S).
33) If not at the predetermined position, position adjustment is performed (step S34).

At this time, the optical sheet member 6 mounted on the fixed plate 41 and the optical sheet member 6 mounted on the movable plate 42 are separated from each other by an end surface 6c serving as a bonding surface. (See FIG. 12A).

If it is confirmed in step S33 that the optical sheet member 6 is at the predetermined position, the antistatic processing device 54 is first turned on (step S35) to prevent dust and the like in the air from adhering to each optical sheet member 6. And then
The bonding unit 51 is moved along the rail member 45 (Step S36).

When the dispenser 55 reaches the base end of the end surface 6c serving as the joining surface of the optical sheet member 6 placed on the fixed plate 41 after the movement is started, FIG.
As shown in (A), the adhesive 7
Is started (step S37).

Then, with the movement of the bonding unit 51, the dispenser 55 moves the end face 6 c of the optical sheet member 6.
Is determined (step S38), and the operation of step S37 is continued until the end is reached.

When it is confirmed in step S37 that the end of the end face 6c of the optical sheet member 6 has been reached, the movable plate 42 is moved along the guide member 47 manually or by a drive mechanism (not shown). (Step S39).

As a result, the one optical sheet member 6 and the other optical sheet member 6 come close to each other, and the adhesive 7 adhered to the end face 6c of one optical sheet member 6 as shown in FIG. Adheres also to the end face 6 c of the other optical sheet member 6, and the adhesive 7 is applied to the end face 6 of the two optical sheet members 6.
c.

At this time, the two optical sheet members 6 are brought close to each other at a constant speed so that uniform bonding can be obtained and no bubbles or the like are mixed in the sandwiched adhesive 7. It is desirable.

Next, the bonding unit 51 is moved in the reverse direction by rotating the feed motor in the bonding unit 51 in the reverse direction (step S40), and as shown in FIG. The excess adhesive 7 protruding from the joint surface between the optical sheet members 6 is sucked by the agent suction device 56 (step S41).

Since the protrusion of the adhesive 7 is considered to occur on both sides of the optical sheet member 6, as shown in FIG. It is good to be able to suck.

Then, it is determined whether or not the adhesive suction device 56 has reached the base end of the end surface 6c of the optical sheet member 6 (step S42). Until the adhesive suction device 56 reaches the end, the operation of step S41 is continued.

When it is confirmed in step S42 that the base end of the end face 6c of the optical sheet member 6 has been reached, this time, the feed motor in the bonding unit 51 is rotated in the forward direction, and the like. The unit is moved again in the same forward direction as in step S36 (step S36).
43).

At the same time as the start of the movement, the curing light 57 is turned on as shown in FIG.
44) Then, the blowing of warm air is started by the warm air device 58 (step S45), and the adhesive 7 is sequentially cured along the joining line.

Thereafter, it is determined whether or not the curing light 57 and the warm air device 58 have reached the end of the end face 6c of the optical sheet member 6 (step S46). Until the light reaches the end, the operations of steps S44 and S45 are performed. Continue to do so.

When it is confirmed in step S46 that the end of the end face 6c of the optical sheet member 6 has been reached, a plurality of optical sheet members 6 are integrated as shown in FIG. This means that an optical sheet having a larger area is formed. Since the adhesive 7 is a transparent material whose optical properties such as the refractive index are as close as possible to those of the material forming the optical sheet member 6, the optical performance may be impaired by the bonding surface. Almost no.

Then, the antistatic processing device 54 turned on in step S35 is turned off, and the joining operation is completed.

Next, FIG. 14 (A), FIG. 14 (B), FIG.
4 (C) correspond to FIG. 11 (A), FIG. 11 (B), FIG.
The entirety of the optical sheet bonding apparatus 3 as shown in (C) is installed in the temperature and humidity control clean booth 5 as described above, and it is also possible to install only the optical sheet bonding apparatus 3. However, it may be installed together with other devices as shown in FIG.

As a result, more stable overall temperature control becomes possible, and it is also effective in preventing dust and the like in the air from adhering to the optical sheet member 6.

FIG. 15 shows an example in which the optical sheet bonding apparatus 3 has an anti-vibration structure. In this example, the same rubber, spring, or the like as described above is provided below the fixing plate 41. An anti-vibration table 36 is provided. Thus, the optical sheet member 6 can be accurately joined without being affected by vibration.

FIG. 16 shows a configuration in which a suction fixing device is provided on the fixed plate 41 and the movable plate 42 in the optical sheet bonding apparatus 3.

In the joining step, similarly to the above-described cutting step, not only the optical sheet member 6 is fixed using the fixing members 43 and 44, but also the suction fixing is performed to secure a higher degree of flatness. It is good to use a device.

That is, as shown in FIG. 16, the optical sheet member 6 of the fixed plate 41 and the movable plate 42
A plurality of suction holes 41a and 42a are respectively formed on the surface on which is mounted, and these suction holes 41a and 42a are
Are provided inside, and the air is sucked by a suction pump 61 via a pipe 61a. Thereby, more accurate joining can be performed.

Next, an example of the configuration of an optical sheet joining apparatus for sequentially joining elongated optical sheet members will be described with reference to FIG.

The optical sheet bonding apparatus 3 sequentially bonds the strip-shaped optical sheet members 6A having a predetermined width along the longitudinal edges.

That is, the optical sheet member 6A before joining
As shown in FIGS. 17 (A) and 17 (B), is wound on winding members 64a and 64b, respectively, is pulled out on the plate 63 at a predetermined speed, and joined while moving. After being wound, it is wound by the winding member 65. At this time, for example, an optical sheet moving mechanism configured to move the optical sheet member 6A with respect to the plate 63 or an adhesive unit 51A described later by rotating the winding member 65 by a driving mechanism such as a motor is configured.

More specifically, the plate 63 is mounted so that the two optical sheet members 6A can move along the longitudinal direction thereof, and furthermore, in the moving direction of the moving path. The two optical sheet members 6A are configured to approach each other from a state separated by a predetermined distance.

The two optical sheet members 6A placed on the plate 63 are pressed by the pressing members 43A and 44A so that at least the part to be joined is moved in close contact with the plate 63. Each is slidably pressed.

An adhesive unit 51A is fixed on the plate 63 near the pressing members 43A and 44A. The adhesive unit 51A sequentially connects the two optical sheet members 6A moving on the plate 63. It is to be joined.

That is, the optical sheet members 6A on the rear side in the traveling direction (closer to the winding members 64a and 64b) are still separated from each other by a predetermined distance. At this time, the optical sheet members 6A are built in the bonding unit 51A. The dispenser 55 (see FIG. 11C or the like) sequentially attaches the adhesive 7 to the end surface 6c which is the joining surface of the one optical sheet member 6A, and further moves away from each other as the optical sheet member 6A advances. When the adhesive comes in close contact at a predetermined speed and sandwiches the adhesive 7 therebetween, the excess adhesive 7 is sucked by the adhesive suction device 56, and then the curing light 5
7 and the hot air device 58.

The configuration and function of the camera 53 for observing the upper surface and the antistatic processing device 54 in the bonding unit 51A are the same as those described with reference to FIG.

As described above, since the optical sheet members 6A are sequentially connected in a series of flows, the bonding unit 51A has a larger optical sheet member 6A than that shown in FIG. 11C, inside the camera 53, the antistatic processing device 54, the dispenser 55, the adhesive suction device 56, and the like, for example, in the order shown in FIG.
The curing light 57 and the hot air device 58 are arranged at required intervals.

According to such a configuration, by continuously joining two strip-shaped optical sheet members 6A each having a predetermined width, an optical sheet having a width approximately twice that of the original optical sheet member 6A is obtained. Can be formed. Then, when used for an optical screen or the like on which an image from the image projection device is projected, an optical sheet of a required size may be cut out from the band-shaped optical sheet after bonding.

Next, with reference to FIGS. 18 to 22, a detailed configuration of the optical sheet itself manufactured in the above-described steps will be described. 18 is a perspective view showing the configuration of the joined optical sheets, FIG. 19 is an enlarged view showing the state of the joined portions of the optical sheet members, and FIG. 20 is an optical sheet member in which the surface shape has undulation in substantially the same direction. FIG. 21 is a diagram showing a state in which the optical sheet members having undulations in a substantially symmetrical direction are generated in the surface shape, and FIG. A) A perspective view showing a state in which the optical sheet members are joined while being aligned at the valleys of the surface shape at both ends of the joining line, (B) and a partially enlarged end view of (A), and (C).
(A) is a cross-sectional view, (D) is a perspective view showing a state in which the optical sheet members are joined by aligning the surface shapes at both ends of the joining line, and (E) is a partially enlarged end view of (D). F) A cross-sectional view in (D), (G) a state in which a gap occurs in the middle of the joining line when the optical sheet members are joined by aligning peaks or valleys of the surface shape at both ends of the joining line. FIG.

The optical sheet member 6 has a surface in which a predetermined shape is periodically repeated in at least one direction at a predetermined pitch (basic period). For example, a plurality of cylindrical lenses are arranged in one direction. Lenticular sheet, a sheet in which the optical refractive index changes alternately in a streak shape, a microlens array in which minute lenses are two-dimensionally arranged, a Fresnel lens sheet in which concentric Fresnel lenses are formed, etc. Is given as an example.

Among these, for example, in the case of a lenticular sheet, the optical sheet cutting device 1 cuts along the axial direction of the arranged cylindrical lenses, and the optical sheet joining device 3 performs joining. Has become.

FIG. 18A shows the state of the optical sheets thus joined. When the optical sheet member 6 is formed of a lenticular sheet, as shown in FIG. 19, the two main surfaces 6a and 6b are formed with the ridge 6d and the valley 6e along the columnar axial direction. ing. Further, as an example of the dimension, the maximum thickness H connecting the ridge 6d of one main surface 6a and the ridge 6d of the other main surface 6b is 0.6 mm, and the pitch W is the interval between adjacent ridges 6d or valleys 6e.
Is 0.24 mm.

In the example shown, the peak 6d and the valley 6e are 2
Although the lenticular sheet is formed on the two main surfaces 6a and 6b, a lenticular sheet formed on only one of the main surfaces may be employed.

When an optical sheet is used as an optical screen, for example, the edge outside the optically effective range (outside the range on which an image is projected) is placed on the edge shown in FIG.
As shown in the figure, the holding member 8 as a reinforcing member is attached,
The joint surface may be reinforced.

Further, when the optical sheet members 6 are joined together, the adhesive 7 does not adhere only between the end surfaces 6c to be joined surfaces as shown in FIG. As shown in (2), the joint portion can be reinforced by covering the surface of the uneven shape, for example, in the range of 1 pitch to 5 pitches around the joint surface. In addition, by applying the transparent adhesive also in the vicinity of the joining portion in this way, it is possible to reduce an optically undesired effect that may occur due to a step of the joining surface of the optical sheet.

As described above, in the manufacturing process of the optical sheet member 6, it is inevitable that the surface irregularities have some undulations, but the undulations are not considered at all. When the joints 6 are joined to each other, the joint surfaces may not match each other, resulting in optical mismatch, and the joint surface may be observed, for example, in a streak shape.

Therefore, when bonding is performed by the optical sheet bonding apparatus 3, based on the information on the surface shape of the optical sheet member 6 obtained from the optical sheet cutting apparatus 1, an optimal combination of optical sheets is obtained. The sheet members 6 are joined together.

Such a combination will be described with reference to FIGS. 20 and 21.

First, FIG. 20 shows a case where optical sheet members having undulations in substantially the same direction on the surface shape are combined.

As shown in FIG. 20A, each of the combined optical sheet members 6 has undulation such that the center portion is curved to the left, and the undulation near the joint surface is caused. Assuming that the magnitude of the undulation of one optical sheet member 6 is x and the magnitude of the undulation of the other optical sheet member 6 is y, a combination of | x−y | <2 pitches is selected. It is more preferable that the pitch is about 1 pitch or less. Specifically, when the pitch W is 0.24 mm as described above, it is preferable that the combination is such that the amount of undulation deviation is 0.48 mm or less.

The vicinity of the joint surface where the degree of the undulation must be matched refers to, for example, a range within about 1 mm from both sides of the joint surface as shown in FIG.

Next, FIG. 21 shows a case where optical sheet members whose surface shapes have undulations in a substantially symmetrical direction are combined.

FIGS. 21 (A) and 21 (B) show examples in which undulations occur such that the irregularities of the surface shape are separated at the center, and FIGS. 21 (C) and 21 (D).
Shows an example in which undulation occurs such that unevenness of the surface shape approaches in the center.

In each of the examples shown in FIGS. 21A and 21B and the examples shown in FIGS. 21C and 21D, | xy− <1.5 pitch Are selected in such a manner that the
It is preferable that the pitch is less than the pitch. Specifically, when the pitch W is 0.24 mm as described above, the combination may be such that the amount of undulation deviation is 0.36 mm or less.

Next, FIG. 22 shows an example in which the undulating optical sheet members 6 are joined to each other at both ends of the joining line by uneven valleys 6e or uneven ridges 6d. Is shown.

First, FIG. 22 (A), FIG. 22 (B), FIG.
2 (C) shows the optical sheet members 6 joined together so that both ends of the joining line become valleys 6e having irregularities, and undulations are generated. Although the valleys 6e are not joined, the valleys 6e are configured to be combined at least at both ends.

FIG. 22D, FIG. 22E, FIG.
Reference numeral 2 (F) denotes a structure in which the optical sheet members 6 are bonded together so that both ends of the bonding line are formed into uneven ridges 6d. Are not joined to each other at the center of the ridge, but at least at both ends thereof, the ridges 6d are combined.

In the optical sheet cutting apparatus 1, the optical sheet member 6 is cut in such a manner that both ends of the end face 6c serving as a joining surface are both formed into a peak or a valley having the uneven shape. It is obtained by doing. In this way, by making at least both ends be the peaks 6d or the valleys 6e, more optical matching can be obtained.

At this time, even if the peaks and the valleys or the valleys and the valleys do not completely coincide with each other on the joining line, the peaks shown in FIG.
As shown in an example, if the deviation g related to the optical characteristics is 50% or less with respect to the amplitude G in the height direction of the unevenness, the joint can have relatively good optical consistency. , Which is an allowable range that is not substantially observed as streaks.

As described above, the optical sheet member 6
Is cut by rotating the wheel-type cutter 16 composed of diamond abrasive grains or cubic boron night abrasive grains at a high speed, the surface roughness of the cut surface is less than Rmax 0.8S. When the applicant carried out, a surface roughness of, for example, about Rmax 0.1 to 0.2 S was obtained. In this way, the optical effect of the cut surface is suppressed to a minimum.

According to such an embodiment, the optical sheet member is cut along a cutting line suitable for joining so as to have a smooth cut surface, and the appropriate optical sheet members are combined and joined with an adhesive. Because of this, an optical sheet in which the joint portion has as little optical influence as possible can be manufactured.

At this time, by performing the production in an environment where the temperature, humidity, the number of dust in the air, and the like are controlled, a more accurate optical sheet can be obtained.

Although it is difficult to avoid undulation in the surface shape of the optical sheet member from the manufacturing process,
Since the cutting position and the combination of the optical sheet members are devised, it is possible to reduce as much as possible the optical inconsistency of the bonding surface due to the undulation.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications and applications can be made without departing from the gist of the invention.

[Appendix] According to the above-described embodiment of the present invention as described in detail above, the following configuration can be obtained.

(1) An optical sheet cutting apparatus for cutting an optical sheet to form an edge suitable for joining, and an optical sheet joining apparatus for joining a plurality of the cut optical sheets at an edge suitable for joining A storage device for storing at least one of a device, an optical sheet cut by the optical sheet cutting device, and an optical sheet joined by the optical sheet joining device; the optical sheet cutting device; and an optical sheet joining device And a storage device, including a transport device that transports the optical sheet, the optical sheet cutting device, a storage device, an optical sheet joining device, and a control device that controls the transport device. An optical sheet manufacturing system, comprising:

(2) The optical sheet cutting device, the storage device, the optical sheet joining device, and the transport device are installed in an environmental management area maintained at a predetermined temperature and a predetermined humidity. 3. The optical sheet manufacturing system according to claim 1, wherein:

(3) The optical sheet cutting device, the storage device, the optical sheet joining device, and the transport device are provided in an environment where the number of dusts per unit volume in the air is maintained at a predetermined value or less. 2. The optical sheet manufacturing system according to claim 1, wherein the optical sheet manufacturing system is installed in a management area.

(4) A mounting table on which an optical sheet to be cut is mounted, wherein a slide position and a rotation position along a main surface of the mounted optical sheet can be adjusted. In order to determine the cutting line of the optical sheet mounted on the mounting table, a search device for searching the surface shape of the optical sheet, and a cutting blade for cutting the optical sheet, at the same cutting position A cutting drive source for driving the cutting blade, and a feed driving source for moving a cutting position by the cutting blade, wherein a moving path of the cutting blade by the feed driving source is The feeding position is adjusted while adjusting the slide position and the rotation position of the optical sheet by the mounting table so as to match the cutting line determined based on the search by the device, and driving the cutting blade by the cutting drive source. An optical sheet cutting device, wherein the optical sheet is cut by moving the cutting blade along the cutting line by a source.

(5) The cutting blade, the cutting drive source, and the feed drive source are integrally formed as a slide unit, and the mounting table has a rail member for guiding the slide unit. 5. The optical sheet cutting device according to claim 4, wherein the slide unit is provided, and is moved relative to the mounting table by the feed drive source.

(6) The mounting table includes a base serving as a base, a moving plate movably mounted on the base, a sliding direction driving means for sliding the moving plate, A rotating plate mounted on the moving plate so as to be rotatable, on which the optical sheet is mounted, and a rotation direction driving means for rotating the rotating plate. The optical sheet cutting device according to attachment 4, wherein:

(7) The mounting table is characterized in that the mounting table further has a fixing member for fixing the optical sheet mounted on the rotating plate to the rotating plate. An optical sheet cutting device according to attachment 6.

(8) The rotating plate has a suction fixing device for sucking the placed optical sheet to fix the rotating optical plate to the rotating plate. 7. The optical sheet cutting device according to 6.

(9) The optical sheet cutting device according to attachment 4, wherein the mounting table has a vibration-proof structure.

(10) The optical sheet cutting apparatus according to attachment 4, wherein the search device includes an imaging device for an upper surface for observing the optical sheet from above.

(11) The exploration apparatus further comprises a cutting plane imaging device for confirming a cutting state by the cutting blade on a base end side and an end side of the cutting line. The optical sheet cutting device according to attachment 10, further comprising:

(12) The optical device according to appendix 4, further comprising a cooling liquid supply device for supplying a cooling liquid for cooling heat generated when the cutting blade cuts the optical sheet. Sheet cutting device.

(13) The cooling liquid supply device includes a liquid temperature adjusting device for maintaining the temperature of the cooling liquid supplied to the cutting blade at a predetermined temperature. 13. The optical sheet cutting device according to supplementary note 12, wherein

(14) The mounting table has a temperature control device for maintaining the mounting table at a predetermined temperature by circulating a temperature control medium inside the mounting table. The optical sheet cutting device according to supplementary note 4, wherein

(15) The optical sheet cutting apparatus according to attachment 4, wherein the cutting blade is a rotary drive wheel type cutter.

(16) The optical sheet cutting apparatus according to appendix 15, wherein the wheel-type cutter is made of diamond abrasive grains or cubic boron night abrasive grains.

(17) The driving source for cutting is the one in which the wheel-type cutter is used at 3000 rpm or more and 30000 rpm.
16. The optical sheet cutting device according to claim 15, wherein the optical sheet cutting device is capable of rotating at a rotation speed of not more than pm.

(18) The optical sheet cutting apparatus according to attachment 4, wherein the optical sheet cutting apparatus is installed in an environmental management area maintained at a predetermined temperature and a predetermined humidity.

(19) The optical sheet cutting apparatus is provided in an environmental management area where the number of dusts per unit volume in the air is maintained at a predetermined value or less. The optical sheet cutting device according to claim 1.

(20) An optical sheet bonding apparatus for bonding one optical sheet to another optical sheet, wherein one optical sheet is separated from the other optical sheet by a predetermined distance. Adhesive is attached to the end surface serving as the bonding surface of the first optical sheet and the other optical sheet is brought close to the other optical sheet, whereby the adhesive attached to the end surface serving as the bonding surface of the one optical sheet is bonded to the other optical sheet. An optical sheet joining apparatus characterized in that an optical sheet is joined by being sandwiched between end faces to be surfaces, and thereafter, an adhesive is cured.

(21) A fixing plate for mounting the above-mentioned one optical sheet, and a mounting plate for mounting the above-mentioned other optical sheet, wherein the other optical sheet is brought close to the above-mentioned one optical sheet. A movable plate provided movably with respect to the fixed plate, for bonding the one optical sheet and another optical sheet, and by moving relative to the fixed plate, 21. The optical sheet bonding apparatus according to claim 20, further comprising: an adhesive unit for applying an adhesive from a base end to an end of an end surface serving as a bonding surface of the one optical sheet.

(22) The fixing plate is provided with a rail member for guiding the bonding unit, and further includes a moving mechanism for moving the bonding unit along the rail member. 22. The optical sheet bonding apparatus according to supplementary note 21, wherein:

(23) The one optical sheet and the other optical sheet are movably mounted, and the one optical sheet and the other optical sheet are set in a predetermined direction in the traveling direction of the moving path. A plate which is arranged to be close to each other from a state separated by a distance, and an end face which is fixed to a predetermined position with respect to the plate and which is a bonding surface of one optical sheet which is separated by the predetermined distance An adhesive unit for applying an adhesive in accordance with the movement of the one optical sheet, an optical sheet moving mechanism for moving the one optical sheet and another optical sheet with respect to the adhesive unit and the plate, 21. The optical sheet bonding apparatus according to supplementary note 20, comprising:

(24) The optical sheet moving mechanism includes a winding member for winding the one optical sheet before joining, a winding member for winding the other optical sheet before joining, and an optical member after joining. It has a winding member for winding the sheet and a drive mechanism for feeding the optical sheet in the traveling direction by rotating at least one of the winding members. 24. The optical sheet bonding apparatus according to supplementary note 23, wherein:

(25) The bonding unit includes an observation imaging device, a dispenser for discharging the adhesive, and a curing light for curing the adhesive. 24. The optical sheet bonding apparatus according to supplementary note 21 or supplementary note 23, which is characterized in that:

(26) The optical sheet bonding apparatus according to Supplementary Note 25, further comprising a monitor device for observing an image captured by the imaging device.

(27) The optical sheet bonding apparatus according to appendix 21, further comprising a fixing member for fixing the optical sheet to at least one of the fixed plate and the movable plate.

(28) At least one of the fixed plate and the movable plate has a suction fixing device for fixing the placed optical sheet by suction. An optical sheet bonding apparatus according to attachment 21.

(29) The one optical sheet and the other optical sheet are brought close to each other at a constant speed from the state separated by the predetermined distance, so that the adhesive adhered to the end face which is the joining surface of the one optical sheet. 20. The optical sheet bonding apparatus according to claim 20, wherein the optical sheet bonding apparatus is sandwiched between the optical sheet and an end surface serving as a bonding surface of another optical sheet.

(30) The adhesive unit according to Supplementary Note 25, wherein the bonding unit further includes an antistatic processing device for preventing charging of the one optical sheet and another optical sheet. Optical sheet bonding equipment.

(31) The bonding unit is characterized in that the bonding unit further includes a warm air device for supplying warm air for promoting the bonding between the one optical sheet and another optical sheet. 26. The optical sheet bonding apparatus according to 25.

(32) The adhesive unit removes an excess portion of the adhesive which has been sandwiched between an end surface serving as a joining surface of the one optical sheet and an end surface serving as a joining surface of the other optical sheet. 26. The optical sheet bonding apparatus according to claim 25, further comprising an adhesive suction device for suctioning.

(33) The optical sheet bonding apparatus according to attachment 20, wherein the optical sheet bonding apparatus has a vibration-proof structure.

(34) The optical sheet bonding apparatus according to appendix 20, wherein the optical sheet bonding apparatus is installed in an environment management area maintained at a predetermined temperature and a predetermined humidity.

(35) The optical sheet bonding apparatus is provided in an environmental management area where the number of dusts per unit volume in the air is maintained at a predetermined value or less. The optical sheet bonding apparatus according to any one of the preceding claims.

(36) An optical sheet having a surface in which a predetermined shape is periodically repeated in at least one direction at a predetermined pitch, and a shape in another direction perpendicular to the one direction has undulation in the one direction. Is an optical sheet constituted by joining a plurality of end surfaces substantially parallel to each other in the other direction, when joining, the shape of the undulation near the end surface serving as the joining surface, based on the joining surface An optical structure characterized by combining optical sheets that are substantially in the same direction or substantially symmetrical direction, so that end faces that are to be joined surfaces are substantially matched to reduce optical mismatch. Sheet.

(37) The optical sheet according to attachment 36, wherein the optical sheet is formed so that the surface roughness of an end surface serving as a bonding surface is Rmax 0.8 S or less.

(38) The range near the joint surface is
37. The optical sheet according to attachment 36, wherein the distance is within 100 mm from the joint surface.

(39) In the case where an optical sheet is formed by combining optical sheets in such a manner that the shape of the undulation in the vicinity of the bonding surface is substantially the same direction with respect to the bonding surface, the pitch direction 37. The optical sheet according to supplementary note 36, wherein optical sheets having a difference in the size of the undulation within two pitches are combined.

(40) In the case where an optical sheet is formed by combining optical sheets such that the shape of the undulation near the bonding surface is substantially symmetrical with respect to the bonding surface, the pitch direction 37. The optical sheet according to supplementary note 36, wherein optical sheets having a difference in the size of the undulation within 1.5 pitches are combined.

(41) In the optical sheet, the above-mentioned predetermined shape has an uneven shape, and an end face to be a joining surface has one end and the other end thereof both having the uneven peak or the both uneven valley. 37. The optical sheet according to attachment 36, wherein the optical sheet is cut in accordance with a standard.

(42) The joining of the optical sheets is performed as follows.
The bonding is performed by bonding the optical sheets to each other using an adhesive, and the adhesive is sandwiched between end surfaces to be a bonding surface, and further has 0 pitch or more around the bonding surface. 37. The optical sheet according to attachment 36, wherein the optical sheet is configured to cover the surface of the optical sheet within a range of 5 pitches or less.

(43) An optical sheet according to attachment 36, wherein a reinforcing member for reinforcing the joint surface is attached to a surface of the portion outside the optically effective range of the joint surface. .

According to the optical sheet manufacturing system described in the appendix, it is possible to manufacture an optical sheet in which the joint portion has as little optical influence as possible.

Further, according to the optical sheet cutting apparatus described in the appendix, it is possible to perform cutting suitable for bonding an optical sheet in which a bonding portion does not exert an optical influence as much as possible.

Further, according to the optical sheet bonding apparatus described in the appendix, the optical sheets can be bonded so that the bonded portion does not exert an optical influence as much as possible.

Further, according to the optical sheet described in the appendix, the bonded portion hardly exerts any optical influence.

[0196]

As described above, according to the optical sheet of the present invention, the joined portion has as little optical influence as possible.

Further, according to the optical sheet manufacturing system of the present invention, it is possible to manufacture an optical sheet in which the joint portion has as little optical influence as possible.

Further, according to the optical sheet cutting apparatus of the present invention, it is possible to cut the optical sheet member so as to be suitable for performing the joining without causing the optical effect of the joining portion as much as possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical sheet manufacturing system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration when the optical sheet manufacturing system of the embodiment is installed in a temperature / humidity control clean booth.

FIG. 3 is a flowchart showing the operation of the optical sheet manufacturing system of the embodiment.

FIG. 4 is a plan view and a front view showing the configuration of the optical sheet cutting device of the embodiment.

FIG. 5 is a flowchart showing the operation of the optical sheet cutting device of the embodiment.

FIG. 6 is a diagram showing a configuration of a cooling liquid supply device in the optical sheet cutting device of the embodiment.

FIG. 7 is a front view including a partial cross section showing a configuration of a base temperature adjusting device for maintaining the temperature of the mounting table at a predetermined temperature in the optical sheet cutting device of the embodiment.

FIG. 8 is a diagram showing a configuration when the optical sheet cutting apparatus of the embodiment is installed in a temperature / humidity control clean booth.

FIG. 9 shows the optical sheet cutting apparatus of the embodiment.
FIG. 4 is a front view showing a configuration example when the mounting table has a vibration-proof structure.

FIG. 10 is a cross-sectional view illustrating a configuration in which a suction fixing device is provided on a rotating plate in the optical sheet cutting device of the embodiment.

11A is a plan view, FIG. 11B is a front view, and FIG. 11C is a partially enlarged view showing the configuration of the optical sheet bonding apparatus according to the embodiment.

FIG. 12 shows an optical sheet joining apparatus according to the embodiment.
The side view which shows the flow when an optical sheet is joined.

FIG. 13 is a flowchart showing the operation of the optical sheet bonding apparatus according to the embodiment.

14A is a plan view, FIG. 14B is a front view, and FIG. 14C is a partially enlarged view showing a configuration when the optical sheet bonding apparatus of the embodiment is installed in a temperature / humidity control clean booth.

FIG. 15 is a front view showing a configuration example when the optical sheet bonding apparatus of the embodiment has a vibration-proof structure.

FIG. 16 is a cross-sectional view showing a configuration when a suction fixing device is provided on at least one of the fixed plate and the movable plate in the optical sheet bonding apparatus of the embodiment.

FIG. 17 is a diagram illustrating a configuration example of an optical sheet bonding apparatus that sequentially bonds elongated optical sheets in the embodiment.

FIG. 18 is a perspective view showing a configuration of a bonded optical sheet in the embodiment.

FIG. 19 is an enlarged view showing a state of a joining portion between optical sheet members in the embodiment.

FIG. 20 is a diagram showing a state where optical sheet members having undulations in substantially the same direction in the surface shape are combined and joined in the embodiment.

FIG. 21 is a diagram showing a state in which optical sheet members having undulations in a substantially symmetrical direction in the surface shape are combined and joined in the embodiment.

FIG. 22 is a perspective view showing a state in which the optical sheet members are joined together by aligning the valleys of the surface shapes at both ends of the joining line in the embodiment, and (B) a partially enlarged end view of (A). , (C) and (A) are cross-sectional views, and (D) is a perspective view showing a state where the optical sheet members are joined by aligning the surface shapes at both ends of the joining line with each other.
(D) is a partially enlarged end view, (F) is a cross-sectional view in (D), and (G) the optical sheet member is joined by aligning peaks or valleys of the surface shape at both ends of the joining line. FIG. 4 is a cross-sectional view showing a state in which a shift occurs in the middle of a line.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical sheet cutting device 2 ... Storage device 3 ... Optical sheet joining device 4 ... Workstation (control device) 5 ... Temperature / humidity management clean booth (environmental management area) 6, 6A ... Optical sheet member 6a, 6b ... Main surface 6c ... End face (end face to be a joining face) 6d... Peak 6e... Valley 7... Adhesive 8... Holding piece (reinforcing member) 11... Base (part of mounting table) 11a. 13) Rotating plate (part of mounting table) 13a ... Rotating pin 13b ... Engagement arm 13c ... Suction hole (part of suction fixing device) 13d ... Vent hole (part of suction fixing device) 14 ... Fixing member 15 Slide unit 16 Wheel-type cutter (cutting blade) 17 Camera for observing upper surface (exploration device, imaging device for upper surface) 18, 19 ... Camera for observing cross section (exploration device, imaging device for cut surface) DESCRIPTION OF SYMBOLS 21 ... Sliding direction drive means 22 ... Rotation direction drive means 23 ... Rail member 24 ... Feed shaft 25 ... Monitor device 31 ... Coolant supply device 32 ... Liquid temperature adjustment device 34 ... Base temperature adjustment device (temperature adjustment device) 35 ... Medium Temperature adjusting device 36: anti-vibration table (constituting anti-vibration structure) 37: suction pump (part of suction fixing device) 41: fixing plate 41a, 42a: suction hole (part of suction fixing device) 41b, 42b Vent holes (part of the suction fixing device) 42 ... Movable plates 43, 44 ... Fixing members 43A, 44A ... Pressing members 45 ... Rail members 46 ... Feed shafts 47 ... Guiding members 48, 49 ... Cross section observation cameras 51, 51A ... Adhesive unit 52 Monitor device 53 Top-view observation camera (imaging device) 54 Antistatic treatment device 55 Dispenser 56 Adhesive suction device 57 (Part of the suction fixing device) 63 ... plate 64a, 64b ... winding member 65 ... take-up member of lights 58 ... hot air device 61 ... suction pump

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masakatsu Ouchi 4487-9 Kamimizo, Sagamihara City, Kanagawa Prefecture Inside Seiko Giken (72) Inventor Isao Toshida 4487-9 Kamimizo, Sagamihara City, Kanagawa Prefecture F Term In Seiko Giken (Reference) 2H021 BA22 BA23 2H042 BA04 BA14 BA15 BA19

Claims (11)

[The claims] 1. An optical sheet adapted to be used on a screen onto which an image from an image projection device is projected, wherein an optical characteristic along a main surface is periodically changed in a first direction. A second direction orthogonal to the first direction is configured to be substantially the same, and a region where the optical characteristics are substantially the same has an undulation undulating in the second direction. The optical sheet includes the same optical sheet member, and the optical sheet is formed by joining a plurality of the optical sheet members to each other with an end surface substantially orthogonal to the main surface as a joining surface. The one optical sheet member and the other optical sheet member to be joined are configured so that the phases of the undulations are synchronized so that the optical characteristics at the joining surface are substantially the same within a predetermined allowable range. Characterized by light Sheet. 2. The optical characteristic that periodically changes is such that irregularities in a height direction perpendicular to the main surface are periodically formed on the surface along the main surface of the optical sheet member in the first direction. The optical sheet according to claim 1, wherein the optical sheet is obtained by forming. 3. The optical system according to claim 1, wherein the magnitude of the waviness is within two pitches when the basic period of the change in the optical characteristics in the first direction is one pitch. Sheet. 4. A method for joining a plurality of optical sheet members, wherein a transparent adhesive is sandwiched between joining surfaces of each other, and a basic period of change of optical characteristics in the first direction is one pitch. The optical device according to claim 1, wherein the transparent adhesive is applied to a surface along the main surface within a range of 1 pitch or more and 5 pitches or less from the joining surface and cured. Sheet. 5. The bonding surface of the optical sheet member is configured to have a surface roughness of Rmax 0.8S or less, and the bonding of the plurality of optical sheet members is transparent between the bonding surfaces. The optical sheet according to claim 1, wherein the optical sheet is formed by sandwiching an adhesive and curing the adhesive. 6. The optical system according to claim 1, wherein the predetermined allowable range in which the optical characteristics at the bonding surface are considered to be substantially the same is within 50% of a periodic change amount of the optical characteristics. The optical sheet according to any one of the above. 7. The predetermined allowable range in which the optical characteristics on the bonding surface are considered to be substantially the same as each other is such that the amount of displacement of the surface of the optical sheet members on the bonding surface in the height direction is equal to the periodicity. The optical sheet according to claim 2, wherein the amplitude is within 50% of the amplitude of the irregularities. 8. Combining optical sheet members having undulations in substantially the same direction with respect to the bonding surface, so that the phases of the undulations are substantially the same within the predetermined allowable range. The optical sheet according to claim 1, wherein the optical sheet is synchronized. 9. A combination of optical sheet members having undulations in a substantially symmetrical direction with respect to the bonding surface so that the phase of the undulations is substantially the same within the predetermined allowable range. The optical sheet according to claim 1, wherein the optical sheet is synchronized. 10. An optical sheet cutting device for cutting an optical sheet to form an edge suitable for joining, and an optical sheet joining device for joining a plurality of the cut optical sheets at an edge suitable for joining And an optical sheet cut by the optical sheet cutting device, and an optical sheet joined by the optical sheet joining device, a storage device for storing at least one of the optical sheet cutting device, and an optical sheet joining device. A storage device, and a control device for controlling the optical sheet cutting device, the storage device, the optical sheet joining device, and the transport device, for transporting the optical sheet between the storage device and the storage device. An optical sheet manufacturing system, characterized in that: 11. A mounting table for mounting an optical sheet to be cut, wherein the mounting table is configured to be able to adjust a slide position and a rotation position along a main surface of the mounted optical sheet; An exploration device for exploring the surface shape of the optical sheet to determine a cutting line of the optical sheet mounted on the mounting table; a cutting blade for cutting the optical sheet; A cutting drive source for driving the cutting blade; and a feed drive source for moving a cutting position by the cutting blade, wherein the movement path of the cutting blade by the feed drive source is the above-mentioned searching device. The slide drive and the rotation position of the optical sheet are adjusted by the mounting table so as to coincide with the cutting line determined based on the search by the above, and the driving for feeding is performed while the cutting blade is driven by the driving source for cutting. An optical sheet cutting apparatus, wherein the optical sheet is cut by moving the cutting blade along the cutting line by a source.