JP2001066600A - Device for rubbing alignment treatment of alignment layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for rubbing alignment treatment of an alignment layer ensuring uniform alignment and preventing release of a rubbing material. SOLUTION: Alignment controllability over a liquid crystal is given to the alignment layer 7 by rubbing the alignment layer 7 with a rubbing material 3 wound around the outer periphery of the roller 1. The cross sectional shape of the roller 1 is made elliptic and the rubbing joint part 4 at both end parts of the rubbing material 3 wound around the outer periphery thereof is positioned on the place corresponding to the minor axis of the ellipse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an alignment film provided on a substrate for a liquid crystal display element by rubbing a rubbing material wound around an outer periphery of a rotating roller to impart an alignment regulating force to the liquid crystal to the alignment film. The present invention relates to a rubbing alignment treatment apparatus for rubbing an alignment film.

[0002]

2. Description of the Related Art It is necessary to align a liquid crystal in a certain direction even when no voltage is applied to a liquid crystal filled between liquid crystal display element substrates. Such alignment of the liquid crystal is performed by an alignment film provided on the surface of the liquid crystal display element substrate.

Incidentally, this alignment film does not have an alignment regulating force for aligning such a liquid crystal in a certain direction unless a certain treatment is performed in advance. Therefore, as one method for causing the alignment film to have an alignment regulating force on the liquid crystal, a rubbing treatment of rubbing the alignment film with a rubbing material is performed on the alignment film so that the alignment film has alignment anisotropy. By forming the film, an alignment regulating force to the liquid crystal can be generated.

In such a rubbing treatment of the alignment film, usually, a rubbing material is wound around an outer peripheral surface of a rotating roller composed of a cylindrical drum, the rotating roller is rotated, and the rubbing material wound around the rotating roller is oriented. This is done by rubbing against the membrane.

Here, when the rubbing material is wound around the outer peripheral surface of the rotating roller, the rubbing material is generally fixed to the rotating roller using a double-sided tape or the like. How to process is important.

[0006] Normally, the rotating roller is a perfect circle, and the seam formed by both ends of the rubbing material is limited to a process in which the cut portions of the rubbing material are abutted.

In this case, since the rubbing material at the joint portion also rubs against the alignment film, the orientation of the liquid crystal of the alignment film in contact with the joint portion is different from the other portions. Also,
When a load is applied to the joint portion of the rubbing material, the rubbing material is separated from the joint portion.

The above problem has been a problem for some time, and conventional techniques for solving this problem are disclosed in, for example, JP-A-5-188375 and JP-A-58-186721.
JP, JP-A-4-60514, JP-A-4-18
There is one disclosed in Japanese Patent No. 4321 or the like.

Table 1 summarizes these features. Further, when these are illustrated in order, they are shown as in FIG. 7 to FIG.

[0010] In any of these techniques, as a means for solving the problem, a flat portion or a concave portion is provided on a part of a perfectly circular rotating roller, and a seam of a rubbing material is processed at the flat portion or the concave portion. We are trying to solve the above problems.

[0011]

[Table 1]

[0012]

However, in the above-mentioned conventional alignment film rubbing alignment treatment apparatus, the alignment of the liquid crystal of the alignment film in contact with the discontinuous surface where the flat portion or the concave portion of the rotating roller changes from a round portion to a perfect circle portion is contacted. The orientation differs from that of the liquid crystal in other places due to the following two reasons.

One is that the rubbing material has different hairs on the discontinuous surface from other portions, and the other is that the pressure applied to the alignment film before and after the discontinuous surface changes abruptly. is there.

From these two causes, the alignment of the liquid crystal of the alignment film in contact with the discontinuous surface is different from that of other places.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a rubbing alignment treatment apparatus for an alignment film capable of obtaining uniform alignment and preventing peeling of a rubbing material. Is to provide.

[0016]

In order to solve the above-mentioned problems, a rubbing alignment treatment apparatus for an alignment film according to the present invention rubs a rubbing material wound around an outer periphery of a rotating roller against the alignment film, thereby forming a film on the alignment film. In the rubbing alignment treatment apparatus of the alignment film to give the alignment regulating force to the liquid crystal by
The rotary roller has an elliptical cross-sectional shape, and seams at both ends of a rubbing material wound around the outer periphery thereof are located at short-diameter portions of the ellipse.

According to the invention, the rubbing material wound around the outer periphery of the rotating roller is rubbed against the alignment film, so that the alignment film can be provided with an alignment regulating force to the liquid crystal.

Here, the cross-sectional shape of the rotating roller is elliptical, and the joints at both ends of the rubbing material wound around its outer periphery are located at the minor diameter of the ellipse.

For this reason, even when the rotating roller is rotated, the joint of the rubbing material can be prevented from contacting the alignment film. Accordingly, it is possible to prevent the rubbing material from being damaged due to the seam portion of the rubbing material coming into contact with the alignment film and the rubbing material being separated.

The cross-sectional shape of the rotating roller is elliptical. For this reason, the rubbing material can be in a state where the rubbing material does not contact the alignment film at the short-diameter portion of the ellipse. It is performed continuously because the shape is elliptical. Therefore,
There can be no discontinuities.

For this reason, the pressure applied to the alignment film does not suddenly change before and after the discontinuous surface where the flat portion or the concave portion of the rotating roller changes from a flat portion to a perfect circular portion as in the related art.

Further, since there is no discontinuous surface, the rubbing material is not different from the other portions in the way of the bristles.

Therefore, the alignment regulating force of the alignment film to the liquid crystal does not differ from other places.

As a result, a uniform orientation can be obtained,
In addition, it is possible to provide a rubbing alignment treatment apparatus for an alignment film that can prevent peeling of a rubbing material.

Further, in order to solve the above problems, the rubbing alignment treatment apparatus for an alignment film of the present invention rubs a rubbing material wound around the outer periphery of a rotating roller against the alignment film to thereby apply a liquid crystal to the alignment film. In a rubbing alignment treatment apparatus for an alignment film for imparting alignment control force, the cross-sectional shape of the rotating roller, while continuously increasing the curvature of a part of the outer circumference and making the other outer circumference a perfect circle, the It is characterized in that seam portions at both ends of the rubbing material to be wound are located on the outer peripheral portion where the curvature of the part is continuously increased.

According to the above invention, in the cross-sectional shape of the rotating roller, the curvature of a part of the outer periphery is continuously increased, and the other outer periphery is a perfect circle. In addition, joints at both ends of the rubbing material wound around the outer periphery are located at the outer periphery where the curvature of the part is continuously increased.

That is, since the seam portions at both ends of the rubbing material are located on the outer peripheral portion where the curvature of the part is continuously increased, the seam portions of the rubbing material remain on the alignment film even when the rotating roller is rotated. Contact can be avoided. Therefore, it is possible to prevent the joint portion of the rubbing material from being damaged by contact with the alignment film and the rubbing material from peeling off.

In the cross-sectional shape of the rotating roller, the curvature of a part of the outer periphery is continuously increased, and the other outer periphery is a perfect circle. That is, for a part of the perfect circle, the curvature is continuously greatly changed. For this reason, the rubbing material can be in a state where the rubbing material does not contact the alignment film at the short-diameter portion of the rotating roller. Since the cross-sectional shape continuously increases the curvature of a part of the outer periphery, the operation is continuously performed. Therefore, there can be no discontinuous surface.

As a result, the pressure applied to the alignment film before and after the discontinuous surface where the flat portion or the concave portion of the rotary roller changes from a flat portion to a perfect circular portion does not suddenly change unlike the related art.

Further, since there is no discontinuous surface, the rubbing material is not different from the other portions in the way of the bristles.

Therefore, the alignment regulating force of the alignment film to the liquid crystal does not differ from other places.

As a result, a uniform orientation can be obtained,
In addition, it is possible to provide a rubbing alignment treatment apparatus for an alignment film that can prevent peeling of a rubbing material.

In order to solve the above-mentioned problems, the rubbing alignment treatment apparatus for an alignment film according to the present invention is characterized in that, in the rubbing alignment treatment apparatus for an alignment film, the alignment regulating force on the liquid crystal in the alignment film has a weakest part. It is characterized by being at least 92% of the strongest part.

According to the above invention, the alignment regulating force for the liquid crystal in the alignment film is such that the weakest portion is the strongest portion of the liquid crystal.
% Or more.

By forming a rotating roller so as to ensure this performance, the liquid crystal display device using an alignment film having an alignment control force applied to the liquid crystal by this rubbing alignment treatment apparatus can reliably ensure display quality. can do.

[0036]

[Embodiment 1] One embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG.

The rubbing alignment treatment apparatus for an alignment film according to the present embodiment has a rotating roller 1 as shown in FIG. As shown in FIG. 1, the rotating roller 1 has an elliptical shape, and can rotate around a rotating shaft 2 provided at the center thereof.

It should be noted that, in FIG.
Although the difference between the major axis and the minor axis is exaggerated, this ellipse is actually, for example, a major axis of 120 mm and a minor axis of 119 mm.

A rubbing material 3 is wound around the outer periphery of the rotary roller 1. The rubbing material 3 is fixed such that rubbing seam portions 4 as seam portions at both ends are located at the minor diameter portions of the ellipse. I have.

The rubbing material 3 can be made of a cloth such as felt or cotton, or a material obtained by artificially planting short fibers such as nylon. Among them, artificially planted short fibers are preferred.

In this embodiment, for example, a double-sided tape 5 is used for fixing the rubbing material 3. Therefore,
After the double-sided tape 5 is adhered to the rotating roller 1, the rubbing material 3 is adhered from above and fixed.

As shown in the figure, the double-sided tape 5 may be located at the other short diameter portion of the elliptical rotary roller 1 where the tape joint 6 is different from the rubbing joint portion 4. preferable.

At this time, when the alignment film 7 is rubbed, the minor axis of the elliptical rotary roller 1 is smaller than the major axis. The rubbing seam portion 4 of the rubbing material 3 located at the position 4 does not contact the alignment film 7 or only contacts it with a weak pressure.

Further, as the alignment film 7, SiO ₂ (spion glass), polyimide or polyvinyl alcohol (PV) is used for a glass plate as a substrate of a liquid crystal cell.
While a polymer film such as A) can be used, modified PVA is applied to the surface of the polymer film, for example, PET.
Or a film of nylon-epoxy-organotitanium type or the like.

A description will be given of the rubbing operation of the alignment film rubbing alignment apparatus of the present embodiment configured as described above.

As shown in FIG. 1, first, the rotating roller 1 to which the rubbing material 3 is attached rotates in the direction of arrow A. The stage 8 holding the alignment film 7 to be aligned is
The rubbing material 3 moves in the direction of arrow B opposite to the rotation direction below the rotating roller 1 and is sequentially rubbed.

At this time, since the rotating roller 1 has an elliptical shape, the pressing amount of the rubbing material 3 changes continuously, and the pressing amount becomes maximum at a position located at the major axis of the ellipse. As shown in FIG. 2, the pressing amount becomes zero at a position located at the minor axis. The rubbing seam portion 4 of the rubbing material 3 is located on the minor axis, and the pushing at this location is
Since it becomes zero as described above, the rubbing seam portion 4
The rubbing treatment can be performed using only the continuous surface of the rubbing material 3 other than the rubbing seam portion 4 without contacting the alignment film 7.

Thus, the rubbing seam portion 4 is
Since it does not affect the alignment film 7, the alignment of the alignment film 7 becomes uniform. In addition, since the load on the rubbing joint portion 4 is zero or small, the rubbing material 3 can be prevented from peeling off.

Here, by making the shape of the rotary roller 1 elliptical, a non-contact portion is generated, so that it is possible that uniform rubbing cannot be performed. On the other hand, by taking appropriate rubbing conditions and an elliptical shape, uniform rubbing can be sufficiently performed.

Further, in the present embodiment, a half of the difference between the major axis and the minor axis is set to be equal to the pressing amount, and the rubbing joint portions 4 at both ends of the rubbing material 3 do not contact the alignment film 7. However, even when the difference between the major axis and the minor axis is smaller and the rubbing seam portion 4 of the rubbing material 3 partially contacts the alignment film 7, an effect similar to the alignment can be obtained.

Further, when the cross-sectional shape of the rotating roller 1 is made to be elliptical, as shown in an embodiment described later, the orientation regulating force of the weakest portion is 92% or more of the orientation regulating force of the strongest portion. , It was found that display quality non-uniformity did not occur. Therefore, by selecting the rubbing conditions and the elliptical shape so that this numerical value can be obtained, uniform rubbing can be performed.

As described above, according to the alignment processing apparatus for a liquid crystal display element of the present embodiment, the shape of the rotating roller 1 is processed into an elliptical shape, and the rubbing seam portions 4 at both ends of the rubbing material 3 are formed. By locating the alignment film 7 at the minor diameter portion, the contact between the alignment film 7 and the rubbing seam portion 4 can be prevented. In addition, since the rubbing material 3 has uniform hairs and the amount of indentation changes continuously, there is no discontinuous surface as in the related art, so that good orientation can be realized. Therefore, the alignment film 7 thus rubbed is treated.
Is used for the alignment treatment of the liquid crystal substrate, it is possible to stably obtain a liquid crystal display device having a clear image with no alignment unevenness, prevent the rubbing material 3 from peeling off, and prevent the liquid crystal substrate from being damaged or manufactured. Loss can be prevented.

As described above, in the alignment film rubbing alignment treatment apparatus according to the present embodiment, the rubbing material 3 wound around the outer periphery of the rotary roller 1 is rubbed against the alignment film 7,
It is possible to impart an alignment regulating force to the liquid crystal to the alignment film 7.

Here, the cross-sectional shape of the rotary roller 1 is elliptical, and the rubbing seam portions 4 at both ends of the rubbing material 3 wound around the outer periphery thereof are located at the minor diameter portions of the ellipse.

For this reason, even when the rotary roller 1 is rotated, the rubbing joint portion 4 of the rubbing material 3 can be prevented from contacting the alignment film 7. Therefore, it is possible to prevent the rubbing material 3 from peeling off due to the rubbing seam portion 4 of the rubbing material 3 being in contact with the alignment film 7.

The cross-sectional shape of the rotary roller 1 is elliptical. For this reason, the rubbing material 3 can be brought into a state in which the rubbing material 3 does not come into contact with the alignment film 7 at the short-diameter portion of the ellipse. Since the cross-sectional shape of the rotating roller 1 is elliptical, the operation is continuously performed.
Therefore, there can be no discontinuous surface.

As a result, the pressure applied to the alignment film does not suddenly change before and after the discontinuous surface where the flat portion or the concave portion of the rotating roller changes from a flat portion to a perfect circular portion as in the related art.

Since there is no discontinuous surface, the rubbing material 3
There is no difference in how the hair stands up.

Accordingly, the alignment regulating force of the alignment film 7 to the liquid crystal does not differ from other places.

As a result, a uniform orientation can be obtained,
In addition, it is possible to provide a rubbing alignment treatment apparatus for the alignment film 7 that can prevent the rubbing material 3 from peeling off.

Further, in the rubbing alignment treatment apparatus for the alignment film 7 of the present embodiment, the alignment regulating force for the liquid crystal in the alignment film is 92% or more of the weakest part of the strongest part.

In order to ensure this performance, the rotating roller 1
Is formed, the display quality can be reliably ensured in the liquid crystal display element using the alignment film 7 to which the alignment control force is applied to the liquid crystal by the rubbing alignment treatment device.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIGS. For convenience of explanation, the first embodiment is described.
Members having the same functions as the members shown in the drawings are denoted by the same reference numerals, and description thereof will be omitted.

In the first embodiment, the cross-sectional shape of the rotary roller 1 is an ellipse. However, the present invention is not limited to this, and the same effect can be obtained even if the cross-sectional shape of the rotary roller is close to an ellipse.

That is, by changing the curvature of a part of the circumference of the cylindrical rotating roller which is a perfect circle continuously, and by positioning the rubbing seam portions 4 which are both ends of the rubbing material 3 at the short diameter portion. The same effect as the elliptical rotary roller 1 can be obtained.

As a variation of such a rotating roller, the roller shape shown in FIGS. 4 to 6 can be mentioned. FIG. 3 shows a schematic diagram of the elliptical rotary roller 1 described in the first embodiment for comparison.

In FIGS. 3 to 6, the cross-sectional shape of the rotating roller is shown by a solid line, and a perfect circle having the same major axis and axis as that of the rotating roller is shown by an alternate long and short dash line.

Therefore, the rubbing seam portion 4 of the rubbing material 3 is provided so as to be located between the one-dot chain line of this perfect circle and the solid line of the minor axis.

The rotary roller shown in FIG. 4 has an elliptical shape on only one side. The rotating roller shown in FIG. 5 is one in which the curvature on both sides of the circumference is continuously changed. Further, the rotating roller shown in FIG. 6 is one in which the curvature on one side of the circumference is continuously changed.

In the variation of the cross-sectional shape of the rotating roller in the present embodiment, only one or two places where the curvature changes are described. However, the present invention is not limited to this. Even in the case of three or more locations, the same effect can be obtained.

As described above, in the apparatus for rubbing orienting an alignment film according to the present embodiment, the cross-sectional shape of the rotating roller is such that the curvature of a part of the outer periphery is continuously increased and the other outer periphery is a perfect circle. ing. The rubbing seams 4 at both ends of the rubbing material 3 wound around the outer periphery are located at the outer periphery where the curvature of the part is continuously increased.

That is, the rubbing seam portions 4 at both ends of the rubbing material 3 are located on the outer peripheral portion where the curvature of the rubbing material 3 is continuously increased. The location 4 can be prevented from contacting the alignment film 7. Therefore, it is possible to prevent the rubbing material 3 from peeling off due to the rubbing seam portion 4 of the rubbing material 3 being in contact with the alignment film 7.

In the cross-sectional shape of the rotating roller, the curvature of a part of the outer periphery is continuously increased, and the other outer periphery is a perfect circle. That is, for a part of the perfect circle, the curvature is continuously greatly changed. For this reason, the rubbing material 3 can be kept out of contact with the alignment film 7 at the short diameter portion of the rotating roller. Since the cross-sectional shape of the rotary roller continuously increases the curvature of a part of the outer periphery, the rotation is continuously performed. Therefore, there can be no discontinuous surface.

Therefore, the pressure applied to the alignment film 7 does not suddenly change before and after the discontinuous surface where the flat portion or the concave portion of the rotary roller changes from a flat portion to a perfect circular portion as in the conventional case.

Since there is no discontinuous surface, the rubbing material 3
There is no difference in how the hair stands up.

Therefore, the alignment regulating force of the alignment film 7 to the liquid crystal does not differ from other places.

As a result, a uniform orientation can be obtained.
In addition, it is possible to provide a rubbing alignment treatment apparatus for the alignment film 7 that can prevent the rubbing material 3 from peeling off.

Also, in the rubbing alignment treatment apparatus for alignment film 7 of the present embodiment, the alignment regulating force for the liquid crystal in alignment film 7 can be set to 92% or more of the weakest part to the strongest part. is there.

As described above, by forming the rotating roller so as to secure this performance, the liquid crystal display device using the alignment film 7 having the alignment control force applied to the liquid crystal by the rubbing alignment processing apparatus can be reliably used. Display quality can be ensured.

[0080]

EXAMPLE An experimental investigation was conducted on the performance when the alignment film 7 was rubbed by the rubbing alignment apparatus of the first embodiment.

In the experiment, as shown in FIG. 1, first, as a condition of the rotating roller 1 in the rubbing alignment treatment apparatus, the major axis of the rotating roller 1 was 120 mm, the minor axis was 119 mm, and the rubbing material 3 and the rubbing material 3 were used. The total thickness with the fixing double-sided tape 5 was 2 mm. Therefore, the pressing amount is 0.5 mm.

The rotation speed of the rotating roller 1 is set to 180
The experiment was performed at 0 rpm and the feed speed of the alignment film 7 was 30 mm / s.

At this time, the rotating roller 1 and the alignment film 7 do not come into contact with each other only when the short diameter is right below, but come into contact with all other portions. The distance between the point P on the alignment film 7 where the minor axis is directly below and the point Q where the adjacent major axis is directly below is 0.25 mm.

Since the distance between the PQs is sufficiently smaller than the roller diameter of the rotating roller 1, the point P on the alignment film 7 comes into contact with a portion other than the short diameter of the rotating roller 1, and is rubbed. For this reason, a sufficient alignment regulating force was obtained.

That is, the measurement results revealed that the orientation regulating force at the point P was given 99.9% of the orientation regulating force at the point Q.

According to an experiment, it was found that display quality non-uniformity did not occur if the alignment control force of the weakest part had a magnitude of 92% or more of the alignment control force of the strongest part. Therefore, by selecting the rubbing conditions and the elliptical shape so that this numerical value can be obtained, uniform rubbing can be performed.

[0087]

As described above, the apparatus for rubbing orienting an alignment film according to the present invention makes the cross-sectional shape of the rotary roller elliptical, and sets the joints at both ends of the rubbing material wound around the outer circumference to the minor diameter of the ellipse. It is located.

Therefore, since the joint portions at both ends of the rubbing material are located at the short-diameter portions of the ellipse, the joint portions of the rubbing material should not be in contact with the alignment film even when the rotating roller is rotated. it can. Therefore,
It is possible to prevent the rubbing material from coming into contact with the alignment film at the joint portion of the rubbing material, thereby preventing the rubbing material from peeling off.

Further, since the cross-sectional shape of the rotating roller is elliptical, the change from the state in which the rubbing material is in contact with the alignment film to the state in which the rubbing material is not in contact is caused by the fact that the cross-sectional shape of the rotating roller is elliptical. Is performed continuously. Therefore, there can be no discontinuous surface.

For this reason, the pressure applied to the alignment film before and after the discontinuous surface where the flat portion or the concave portion of the rotating roller changes from a flat portion to a perfect circular portion does not suddenly change as in the related art.

Further, since there is no discontinuous surface, the rubbing material is not different from the other portions in the way of the bristles.

Accordingly, the alignment regulating force of the alignment film to the liquid crystal does not differ from other places.

As a result, a uniform orientation can be obtained.
In addition, there is an effect that an apparatus for rubbing orienting an alignment film capable of preventing the rubbing material from peeling can be provided.

Further, as described above, the rubbing alignment treatment apparatus for an alignment film of the present invention makes the cross-sectional shape of the rotating roller continuously increase the curvature of a part of the outer periphery and makes the other outer periphery a perfect circle. On the other hand, the joints at both ends of the rubbing material wound around the outer periphery are located at the outer periphery where the curvature of the part is continuously increased.

Therefore, since the joints at both ends of the rubbing material are located on the outer peripheral portion where the curvature of the part is continuously increased, the joints of the rubbing material are aligned even when the rotating roller is rotated. Contact can be prevented. Therefore, it is possible to prevent the joint portion of the rubbing material from being damaged by contact with the alignment film and the rubbing material from peeling off.

The change from the state in which the rubbing material is in contact with the alignment film to the state in which the rubbing material does not come into contact is that the cross-sectional shape of the rotating roller continuously increases the curvature of a part of the outer periphery and the other outer periphery is a perfect circle. So that they are performed continuously. Therefore, there can be no discontinuous surface.

Therefore, unlike the related art, the pressure applied to the alignment film does not suddenly change before and after the discontinuous surface where the flat portion or the concave portion of the rotary roller changes from a flat portion to a perfect circular portion.

Further, since there is no discontinuous surface, the rubbing material is not different in the way the hair rises from other portions.

Accordingly, the alignment regulating force of the alignment film to the liquid crystal does not differ from other places.

As a result, a uniform orientation can be obtained.
In addition, there is an effect that an apparatus for rubbing orienting an alignment film capable of preventing the rubbing material from peeling can be provided.

Further, as described above, the rubbing alignment treatment apparatus for an alignment film according to the present invention is characterized in that, in the above rubbing alignment treatment apparatus for an alignment film, the alignment regulating force on the liquid crystal in the alignment film is:
The weakest part is 92% or more of the strongest part.

Therefore, by forming a rotating roller so as to ensure this performance, a liquid crystal display device using an alignment film having an alignment regulating force applied to the liquid crystal by this rubbing alignment treatment apparatus can reliably display an image. This produces an effect that quality can be ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a rubbing alignment treatment apparatus for an alignment film according to the present invention, in which a major axis of a rotary roller having an ellipse is performing a rubbing process on the alignment film.

FIG. 2 is a cross-sectional view showing a state in which the minor axis of the elliptical rotary roller is separated from an alignment film in the rubbing process.

FIG. 3 is a schematic view showing a rotating roller composed of the ellipse.

FIG. 4 is a schematic view of a rotating roller showing another embodiment of a rubbing alignment treatment apparatus for an alignment film according to the present invention.

FIG. 5 is a schematic view of a rotating roller showing still another embodiment of the alignment film rubbing alignment treatment apparatus of the present invention.

FIG. 6 is a schematic view of a rotating roller showing still another embodiment of the alignment film rubbing alignment treatment apparatus of the present invention.

FIG. 7 is a schematic view showing a conventional rubbing alignment treatment apparatus for an alignment film, showing a joint between a rotary roller and a rubbing material.

FIG. 8 is a schematic view showing another conventional rubbing alignment treatment apparatus for an alignment film, showing a joint between a rotating roller and a rubbing material.

FIG. 9 is a schematic view showing another conventional rubbing alignment treatment apparatus for an alignment film, showing a joint between a rotating roller and a rubbing material.

FIG. 10 is a schematic view showing another conventional rubbing alignment treatment apparatus for an alignment film, showing a joint between a rotary roller and a rubbing material.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotating roller 2 rotating shaft 3 rubbing material 4 rubbing seam location (seam location) 5 double-sided tape 6 tape seam 7 orientation film 8 stage

Claims (3)

[Claims] 1. A rubbing alignment treatment apparatus for an alignment film, wherein a rubbing material wound around an outer periphery of a rotation roller is rubbed against the alignment film to impart an alignment regulating force to the liquid crystal to the alignment film. A rubbing alignment treatment apparatus for an alignment film, characterized in that the shape of the rubbing material wound around the outer periphery of the rubbing material is located at the minor axis of the ellipse. 2. A rubbing alignment treatment apparatus for an alignment film, wherein a rubbing material wound around the outer periphery of the rotation roller is rubbed against the alignment film to impart an alignment regulating force to the liquid crystal to the alignment film. The shape is such that the curvature of a part of the outer periphery is continuously increased and the other outer periphery is a perfect circle, while the seams at both ends of the rubbing material wound around the outer periphery are continuously increased in the curvature of the part. A rubbing alignment treatment device for an alignment film, wherein the rubbing alignment treatment device is disposed at a peripheral portion of the rubbing. 3. The rubbing alignment treatment apparatus for an alignment film according to claim 1, wherein the alignment regulating force for the liquid crystal in the alignment film is 92% or more of the weakest part relative to the strongest part. .