JP6065143B1 - Light control film, laminated glass, and method for manufacturing light control film - Google Patents

Abstract

The reliability of a bead spacer is further improved as compared with the related art. A liquid crystal layer is sandwiched between first and second stacked bodies having at least alignment layers, and electrodes provided on the first and second stacked bodies. The light control film 10 controls the transmitted light by controlling the alignment of the liquid crystal molecules 14A related to the liquid crystal layer 14 by driving 22B and 22A. In the first laminated body 13, a bead spacer 24 that maintains the thickness of the liquid crystal layer 14 is provided on a base material 21 </ b> B made of a transparent film material, and the first and second laminated bodies 13 and 12 are provided with a bead spacer 24. The Vickers hardness value B of the portion of the second laminated body 12 in contact is 11.8 or more and 35.9 or less, and the bead spacer 24 on the first laminated body 13 in a state where the first laminated body 13 is viewed in plan. The multiplication value A × B of the occupation ratio A, which is the ratio of the area occupied by Vickers, and the Vickers hardness value B is 0.42 or more. [Selection] Figure 2

Description

  The present invention relates to a light control film that can be used for, for example, an electronic blind that is attached to a window to control the transmission of extraneous light, and a laminated glass using the light control film.

  Conventionally, various devices relating to a light control film that can be used for, for example, an electronic blind that is attached to a window to control the transmission of external light have been proposed (Patent Documents 1 and 2). One such light control film uses liquid crystal. The light control film using the liquid crystal is manufactured by sandwiching a liquid crystal material with a transparent plate material on which a transparent electrode is manufactured, and manufacturing the liquid crystal cell with a linear polarizing plate. As a result, this light control film changes the orientation of the liquid crystal by changing the electric field applied to the liquid crystal to block or transmit the extraneous light, and further changes the amount of transmitted light. To control.

  Such a light control film is configured such that a spacer is provided on a transparent substrate constituting the liquid crystal cell, and the liquid crystal layer is held at a constant thickness by the spacer. In addition, a configuration widely used in the image display panel is applied to the spacer, and for example, a bead spacer can be applied. Patent Documents 3 and 4 propose a device for this bead spacer.

  By the way, in the conventional light control film, a bead spacer may penetrate into the surface which opposes by the pressing force etc. in use. As a result, in the conventional light control film, the cell gap may become non-uniform or a local alignment defect may occur, which may make it difficult to control light uniformly. Moreover, the liquid crystal material of the liquid crystal layer sometimes leaked. As a result, the conventional light control films still have insufficient practical problems in terms of reliability with respect to the bead spacers.

JP 03-47392 A Japanese Patent Laid-Open No. 08-184273 Japanese Patent Laid-Open No. 62-286023 Japanese Patent Laid-Open No. 02-120719

  This invention is made | formed in view of such a condition, and it aims at enabling it to improve the reliability regarding a bead spacer further compared with the former.

  The present inventor has conducted extensive research to solve the above-mentioned problems, and the Vickers hardness value B of the surface where the bead spacer abuts, the occupation ratio A and the hardness value B, which are the proportion of the area occupied by the bead spacer in a plan view. The idea of selecting a multiplication value A × B with the present invention has been completed, and the present invention has been completed.

  Specifically, the present invention provides the following.

(1) A liquid crystal layer is sandwiched between first and second laminated bodies each including at least an alignment layer, and liquid crystal molecules related to the liquid crystal layer are driven by driving electrodes provided in the first and second laminated bodies. In the light control film that controls the transmitted light by controlling the orientation of
The first laminate is
A base material made of a transparent film material is provided with a bead spacer for maintaining the thickness of the liquid crystal layer,
The first and second laminates are:
The Vickers hardness value B of the portion of the second laminate in contact with the bead spacer is 11.8 or more and 35.9 or less,
In a state where the first laminate is viewed in plan, a multiplication value A × B of an occupation ratio A which is a ratio of an area occupied by the bead spacer on the first laminate and the Vickers hardness value B is: The light control film which is 0.42 or more.

  According to (1), when the Vickers hardness value B is 11.8 or more and 35.9 or less, the situation where the bead spacer penetrates into the opposite surface due to the pressing force during use, etc. is reduced. It is possible to reduce cell gap nonuniformity and local alignment failure, and to effectively avoid leakage of liquid crystal material. Further, it is possible to reduce the damage to the base material and to reduce the occurrence of cracks when the whole is bent. In addition, since the multiplication value A × B of the occupation ratio A and the Vickers hardness value B is 0.42 or more, when the occupation ratio A is small, the Vickers hardness value B is set to be large, and the bead spacer The cell gap can be maintained by the hardness B corresponding to the stress concentration on the surface, and the reliability of the bead spacer can be further improved as compared with the conventional case.

  (2) A laminated glass formed by sandwiching the light control film according to (1) between plate glasses.

  According to (2), a laminated glass can be comprised with the light control film which improves further the reliability regarding a bead spacer compared with the past.

(3) a first laminate production process for producing a first laminate comprising at least an alignment layer;
A second laminate production process for producing a second laminate comprising at least an alignment layer;
A liquid crystal cell manufacturing process for manufacturing a liquid crystal cell formed by stacking the first stacked body, the liquid crystal layer, and the second stacked body,
The first laminate manufacturing process includes:
The substrate comprises a bead spacer arrangement step of arranging a bead spacer for maintaining the thickness of the liquid crystal layer,
The second laminate manufacturing process includes:
Producing the second laminate so that the Vickers hardness value B of the portion of the second laminate in contact with the bead spacer is 11.8 or more and 35.9 or less,
The bead spacer arranging step includes
In a state where the first laminate is viewed in plan, a multiplication value A × B of an occupation ratio A which is a ratio of an area occupied by the bead spacer on the first laminate and the Vickers hardness value B is: The manufacturing method of the light control film which arrange | positions the said bead spacer so that it may be 0.42 or more.

  According to (3), when the Vickers hardness value B is 11.8 or more and 35.9 or less, it is possible to reduce the situation where the bead spacer penetrates the opposing surface due to the pressing force during use, etc. It is possible to reduce cell gap nonuniformity and local alignment failure, and to effectively avoid leakage of liquid crystal material. In addition, since the multiplication value A × B of the occupation ratio A and the Vickers hardness value B is 0.42 or more, when the occupation ratio A is small, the Vickers hardness value B is set to be large, and the bead spacer The cell gap can be maintained by the hardness B corresponding to the stress concentration on the surface, thereby reducing the situation where the bead spacer penetrates into the surface that is further opposed to the cell gap, making the cell gap non-uniform, and the local orientation Defects can be reduced, and leakage of the liquid crystal material can be effectively avoided. By these, the reliability regarding a bead spacer can be improved further compared with the past.

  ADVANTAGE OF THE INVENTION According to this invention, regarding the light control film using a liquid crystal, the reliability regarding a bead spacer can be improved further conventionally.

It is a figure which shows the laminated glass which concerns on 1st Embodiment of this invention. It is a figure which shows the light control film used for the laminated glass of FIG. It is a figure where it uses for description of operation | movement of the light control film of FIG. It is a flowchart which shows the manufacturing process of the light control film of FIG.

[First Embodiment]
[Laminated glass]
FIG. 1 is a cross-sectional view showing a laminated glass according to the first embodiment of the present invention. The laminated glass 1 is a laminated glass applied to, for example, a vehicle window, and is configured by sandwiching a light control film 10 between plate glasses 2 and 3 through intermediate layers 4 and 5, respectively. Here, as the glass plates 2 and 3, various materials applicable to this type of laminated glass can be widely applied. The intermediate layers 4 and 5 are configured to function as an adhesive layer between the light control film 10 and the plate glasses 2 and 3, and various configurations applied to this type of laminated glass can be widely applied. You may make it provide the function as a shielding material.

  The laminated glass 1 is formed by providing the intermediate layers 4 and 5 on the plate glasses 2 and 3, respectively, and laminating the light control film 10, and then heating and pressurizing the glass plates 2 and 3 through the intermediate layers 4 and 5. While integrating the optical film 10, the whole is shaped into a desired curved surface shape. Thereby, the laminated glass 1 is manufactured so that it can be applied to, for example, a rear window of a vehicle, and the transmitted light can be controlled by the light control film 10. In addition, the manufacturing process of the laminated glass 1 by this is the lamination process which laminates | stacks the plate glass 2 and 3 which each provided the intermediate | middle layers 4 and 5 with the light control film 10, and the heating and pressurization process which heats and pressurizes the laminated body obtained as a result Is provided.

[Light control film]
FIG. 2 is a cross-sectional view showing a light control film. The light control film 10 is formed in a film shape, and is used by being attached to a portion where light control is to be performed, for example, when used for laminated glass. In addition, when it is used by pasting on such a light control part, for example, when it is placed on a window of each part of a vehicle, a window glass of a building, a showcase, an indoor transparent partition, etc., it is switched between transmission and opaque Etc.

  This light control film 10 is a light control film that controls transmitted light using liquid crystal, and a liquid crystal layer 14 is formed by a lower laminate 13 and an upper laminate 12 that are first and second laminates according to a film shape. Is produced by sandwiching the liquid crystal cell 15 by linearly polarizing plates 16 and 17. In this embodiment, the liquid crystal layer 14 is driven by a TN (Twisted Nematic) method, but various driving methods such as a VA (Virtual Alignment) method, an IPS (In-Place-Switching) method, and the like. Can be applied. The light control film 10 is provided with a bead spacer 24 in the upper laminate 12 and / or the lower laminate 13 for keeping the thickness of the liquid crystal layer 14 constant. The linear polarizing plates 16 and 17 are respectively provided with retardation films 18 and 19 for optical compensation on the liquid crystal cell 15 side. The laminates 12 and 13 are formed by sequentially forming electrodes 22A and 22B and alignment layers 23A and 23B on the base materials 21A and 21B, respectively. The retardation films 18 and 19 may be omitted as necessary. Moreover, the light control film 10 may be manufactured by a guest host system, and in this case, a linearly polarizing plate may be arrange | positioned to one or both of a liquid crystal cell as needed.

  Accordingly, the light control film 10 is configured to control the transmission of the extraneous light L1 and switch the state between the transparent state and the non-transparent state as shown in FIG. 3 by changing the applied voltage of the electrodes 22A and 22B. Is done. 3A shows a state in which no voltage is applied between the electrodes 22A and 22B, and FIG. 3B shows a state in which a voltage is applied to the electrodes 22A and 22B. The liquid crystal layer 14 is driven by normally white. Instead of this, it may be driven by normally black. In the case of the IPS system, it is needless to say that the electrodes 22A and 22B are manufactured together on the alignment layer 23A or 23B side, and the laminates 12 and 13 are configured to correspond to this.

  In the case where the light control film 10 is used by being attached to, for example, a window glass of a building, a showcase, an indoor transparent partition, etc., the linearly polarizing plate 16 and / or 17 on the side opposite to the liquid crystal cell 15 is used. A protective layer such as a hard coat layer is provided on the surface.

  Here, various transparent film materials having flexibility applicable to the liquid crystal cell 15 can be applied to the base materials 21A and 21B. In this embodiment, the base material 21A and 21B are made of polycarbonate in which hard coat layers are manufactured on both sides. Film material is applied. Although the electrodes 22A and 22B can apply a substantially uniform electric field to the liquid crystal layer 14 and can adopt various configurations that are perceived as transparent, in this embodiment, ITO (Indium which is a transparent electrode material) is applicable. A transparent conductive film by Tin Oxide) is manufactured and formed on the entire surfaces of the base materials 21A and 21B. As described above, in the IPS method or the like, the electrodes are manufactured by being patterned in a desired shape.

  The alignment layers 23A and 23B are formed of a photo-alignment layer. Here, as the photo-alignment material applicable to the photo-alignment layer, various materials to which the photo-alignment technique can be applied can be widely applied. However, in this embodiment, for example, a light dimerization type material is used. . The light dimerization type material is described in “M. Schadt, K. Schmitt, V. Kozinkov and V. Chigrinov: Jpn. J. Appl. Phys., 31, 2155 (1992)”, “M. Schadt, H. Seiberle and A. Schuster: Nature, 381, 212 (1996). In addition, it may replace with a photo-alignment layer and may manufacture by a rubbing process. In the case of manufacturing by rubbing treatment, the alignment layers 23A and 23B are manufactured by manufacturing various material layers applicable to the alignment layer such as polyimide, and then fine line-shaped irregularities by rubbing treatment using a rubbing roll on the surface of the material layer. Formed by manufacturing the shape. Moreover, it may replace with the alignment layer by such a rubbing process, and a photo-alignment layer, and may manufacture the alignment layer by manufacturing the fine line-shaped uneven | corrugated shape manufactured by the rubbing process by a shaping process.

  The bead spacer 24 is provided to define the thickness of the liquid crystal layer 14. The bead spacer 24 can be widely applied to a configuration of an inorganic material such as silica, a configuration of an organic material, a configuration of a core-shell structure combining these, and the like. Moreover, you may comprise by the rod shape by cylindrical shape, prismatic shape, etc. other than the structure by spherical shape. The bead spacer 24 may be provided on the upper laminate 12 or may be provided on both the upper laminate 12 and the lower laminate 13. The bead spacer 24 may be provided on the alignment layer 23B. Moreover, although the bead spacer 24 is manufactured by a transparent member, the color may be adjusted by applying a colored material as necessary.

  Various liquid crystal materials applicable to this type of light control film can be widely applied to the liquid crystal layer 14. Specifically, for the liquid crystal layer 14, for example, a liquid crystal compound described in JP-A No. 2003-366484 can be used. Moreover, as a marketed product, liquid crystal materials, such as Merck MLC2166, can be applied, for example. In the case of the guest-host method, the liquid crystal layer is mixed with a liquid crystal material and a dye for dimming, but a mixture of a liquid crystal material and a dye proposed for the guest-host method can also be widely applied. . In the liquid crystal cell 15, a sealing material 25 is disposed so as to surround the liquid crystal layer 14, and leakage of liquid crystal is prevented by the sealing material 25. Here, for example, an epoxy resin, an ultraviolet curable resin, or the like can be applied to the sealing material 25.

〔Manufacturing process〕
FIG. 4 is a flowchart showing the manufacturing process of the light control film 10. In the liquid crystal cell 15, the first stacked body 13 is manufactured in the first stacked body manufacturing process SP2. In the first laminate manufacturing process SP2, in the electrode manufacturing process SP2-1, the transparent electrode 22B made of ITO is manufactured on the base material 21B by sputtering or the like. In the subsequent spacer arrangement step SP2-2, the bead spacer 24 is arranged.

  Here, in addition to wet / dry spraying, various arrangement methods can be widely applied to the bead spacer 24. In this embodiment, the bead spacer 24 is formed by partially applying a coating liquid produced by dispersing the bead spacer 24 together with a resin component in a solvent, and then sequentially performing drying and firing processes, thereby forming the electrode 22B. The bead spacers 24 are randomly arranged on the top and kept difficult to move, whereby the bead spacers 24 are arranged.

  Subsequently, in the alignment layer manufacturing step SP2-3, the light control film manufacturing process is performed by applying and drying the coating liquid related to the alignment layer 23B, and then curing it by irradiation with ultraviolet rays, whereby the alignment layer 23B is manufactured. Is done. Thus, in this embodiment, the first laminate 13 is manufactured.

  In the manufacturing process of the light control film 10, the second stacked body 12 is manufactured in the subsequent second stacked body manufacturing process SP3 in the same manner as the first stacked body manufacturing process SP2. That is, in the second laminate manufacturing process SP3, the transparent electrode 22A made of ITO is manufactured on the base material 21A by sputtering or the like, and the coating liquid related to the alignment layer 23A is applied, dried and cured to manufacture the alignment layer 23A. Thus, the second laminate 12 is manufactured.

  In this manufacturing process, in the subsequent liquid crystal cell manufacturing process SP4, after applying the sealing material 25 in a frame shape using a dispenser, a liquid crystal material is disposed in a portion surrounded by the frame shape, and the upper laminated body 12, The lower laminate 13 is stacked and pressed to cure the sealing material 25 by irradiation of ultraviolet rays or the like, thereby manufacturing the liquid crystal cell 15. In the arrangement of the liquid crystal material, the upper laminated body 12 and the lower laminated body 13 are laminated first, and the upper laminated body 12 and the lower laminated body 13 are arranged in a gap formed by laminating. You may do it.

  The light control film 10 is formed by being laminated with the linear polarizing plates 16 and 17 in the subsequent lamination step SP5. The liquid crystal cell 15 is provided in the form of a long film in which the base materials 21A and 21B are wound on a roll, and all of these processes SP2 to SP5 or a part of these processes SP2 to SP5 are based on the roll. It is executed while the materials 21A and 21B are pulled out and conveyed. As a result, each step of the liquid crystal cell 15 is executed by a single wafer process from an intermediate step as necessary.

[Detailed configuration of bead spacer]
Here, in this embodiment, the bead spacer 24 is arranged by the process shown in FIG. 4 to manufacture a light control film, and the Vickers hardness value B of the portion of the upper laminate 12 with which the bead spacer 24 abuts is 11. It is set to be 8 or more and 35.9 or less, and the multiplication value A × B of the occupation ratio A of the bead spacer 24 and the Vickers hardness value B is set to 0.42 or more. Here, the occupation ratio A is a ratio of the area of the bead spacer 24 to the area of the lower laminate 13 in a state where the lower laminate 13 is viewed in plan (a state seen from the vertical direction). Thereby, in this embodiment, the reliability regarding a bead spacer improves further compared with the past. In addition, the value of Vickers hardness is a measured value under the conditions described in the following examples and comparative examples.

  When the Vickers hardness value B of the portion of the second laminate 12 with which the tip of the bead spacer 24 abuts is less than 11.8, the tip of the bead spacer 24 penetrates into the opposite surface due to the pressing force during use. As a result, the cell gap becomes non-uniform or local alignment failure occurs. Moreover, when the Vickers hardness value B of the said part exceeds 35.9, a crack will arise when the whole is bent.

  Further, when the multiplication value A × B with the Vickers hardness value B is less than 0.42, the tip of the bead spacer 24 penetrates into the opposing surface, and as a result, the cell gap becomes non-uniform or local An alignment failure occurs.

  However, the Vickers hardness value B of the portion of the upper laminate 12 with which the bead spacer 24 abuts is 11.8 or more and 35.9 or less, and the multiplication value A × B of the occupation ratio A and the Vickers hardness value B is 0.42 or more. If it is set so that these can be solved at once, the reliability of the bead spacer can be further improved as compared with the prior art.

  That is, if the Vickers hardness value B of the portion of the upper laminate 12 with which the bead spacer 24 abuts is 11.8 or more and 35.9 or less, the tip of the bead spacer 24 does not penetrate into the opposite surface due to the pressing force during use. And generation of cracks can be prevented. Furthermore, when the multiplication value A × B of the occupation ratio A and the Vickers hardness value B is 0.42 or more, the situation where the bead spacer is further penetrated is further reduced, and further, cracks when bent are reduced. Generation can be reduced.

  That is, when the Vickers hardness value B is small, it can be said that the part is soft, and this facilitates penetration of the bead spacer. On the contrary, when the Vickers hardness value B is large, the part is hard and cracks are likely to occur when bent. Thereby, by setting the hardness value B to 11.8 or more and 35.9 or less, it is possible to reduce the situation in which the bead spacer penetrates, and further to reduce the occurrence of cracks when bent.

  However, even when the hardness value B is set in this way, the magnitude of the stress to one spacer varies depending on the number of spacers, and if the occupancy A as the index is small, the stress to one spacer As a result, even if the hardness value B is 11.8 or more and 35.9 or less, the bead spacer is likely to penetrate when the multiplication value A × B is less than 0.42. Further, when the occupation ratio A is small, the number of spacers is small, so that the stress concentration related to bending increases, and even if the hardness value B is 11.8 or more and 35.9 or less, the multiplication value. When A × B is less than 0.42, cracks are likely to occur. Thereby, the Vickers hardness value B is set to 11.8 or more and 35.9 or less, and the multiplication value A × B is set to 0.42 or more, the reliability relating to the bead spacer can be further improved as compared with the related art.

〔Test results〕
Tables 1 and 2 are charts showing test results used for confirming the configuration related to the bead spacer. The Examples and Comparative Examples in Tables 1 and 2 are configured identically except that the configurations related to the bead spacer and the alignment layer with which the bead spacer abuts are different. More specifically, in the light control films of these examples and comparative examples, the bead spacer 24 is provided only in the lower laminate 13, and the occupation ratio A is variable depending on the selection of the size of the bead spacer 24 and the coating amount. did. Moreover, the Vickers hardness value B of the part of the 2nd laminated body 12 which the front-end | tip of the bead spacer 24 contact | abutted was set with the conditions at the time of manufacturing alignment layer 23A.

  That is, the bead spacer 24 is coated on the electrode 22B by applying a coating liquid prepared by dispersing the bead spacer 24 in a solvent together with a resin component, followed by drying, curing by ultraviolet irradiation, and firing. The bead spacers 24 are randomly arranged and are arranged so as to be difficult to move. The occupancy of the bead spacer 24 was adjusted by adjusting the amount charged into the coating solution and the coating film thickness of the coating solution.

In Examples and Comparative Examples, the density of the bead spacer 24 is set to 40 / mm ² , 50 / mm ² , and 100 / mm ² , and the bead spacer 24 has a spherical shape with diameters of 3 μm and 6 μm. Applied. Thus, the lower laminate 13 was manufactured with the occupation ratio A of 0.028%, 0.035%, 0.071%, 0.113%, and 0.141%. In addition, as the bead spacer 24, Sekisui Chemical Co., Ltd. micropearl EX series was applied.

  The base material 21B is a COP (cycloolefin polymer) film having a thickness of 100 μm and provided with a hard coat layer. The electrode 22B was manufactured with a thickness of 20 nm.

  The alignment layer 23B was manufactured by coating the coating solution so as to have a dry film thickness of 100 nm and further thermosetting.

  On the other hand, in the alignment layer 23A of the upper laminated body 12 on which the bead spacer 24 abuts, as with the alignment layer 23B, the conditions for thermosetting after applying and drying the coating liquid Vickers hardness value B was set by setting (heating temperature, heating time) and the like. Thereby, in the Example and the comparative example, the upper side laminated body 12 whose Vickers hardness value B is 10.2, 11.8, 35.9, 38.5 was manufactured (Table 3). In addition, this hardness B sets the preparation conditions of the alignment layer 23A, respectively, manufactures the upper laminated body 12 from which hardness differs about the alignment layer 23A, and once manufactures the light control film 10 by this upper laminated body 12, it decomposes | disassembles. It is a measured value measured. This measurement is a measurement result by measuring 12 points and averaging the remaining 10 points excluding the maximum and minimum values.

  The Vickers hardness value B was measured using PICODETOR HM500 manufactured by Helmut Fischer. The measurement was performed under the measurement conditions of a maximum load of 100 mN with an indentation speed of 300 mN / 20 sec, a release speed of 300 mN / 20 sec, and a creep time of 5 seconds.

  The base material 21A and the electrode 22A of the upper laminate 12 were configured the same as the base material 21B and the electrode 22B of the lower laminate 13. The alignment layer 23A was configured the same as the alignment layer 23B except that the hardness B was adjusted.

In each of Examples and Comparative Examples in Tables 1 and 2, a light control film was manufactured and tested using the upper laminate 12 and the lower laminate 13 thus manufactured. In the tests of Tables 1 and 2, with a light control film placed on a smooth surface with high hardness by a surface plate, a weight of 1 kg / cm ² was applied for 1 minute, and then the liquid crystal cell was driven to adjust the cell gap. Declined decrease. Moreover, after weighting in this way, the upper laminate and the lower laminate were peeled off and the part where the bead spacer contacted was observed with a microscope to observe penetration of the bead spacer tip.

  Here, when the part where the bead spacer 24 abuts is perspectiveed using a technique such as SEM, when a depression (recess) is confirmed, “film penetration” is indicated by “x”, and when a recess is not recognized, “ “Film penetration” is indicated by “◯”.

  Further, in the state of the light control film, it was wound around a cylindrical mandrel having a diameter of 2 mm in accordance with the bending test of JIS K5600-5-1 to confirm the occurrence of cracks. In this test, when the occurrence of cracks in the substrate is confirmed in more than half of the multiple samples, “crack” is indicated by “x”, and conversely, in more than half of the multiple samples, cracks are generated in the substrate. When the occurrence is not confirmed, “crack” is indicated by “◯”.

  In the measurement results of Tables 1 and 2, the Vickers hardness value B of the portion of the second laminate 12 with which the bead spacer 24 abuts is 11.8 or more and 35.9 or less, and the occupation ratio A and the Vickers hardness value B are When the multiplication value A × B is 0.42 or more, it was confirmed that film penetration could be prevented and cracks were not generated, and that it was possible to sufficiently ensure the reliability of the bead spacer.

[Other Embodiments]
As mentioned above, although the specific structure suitable for implementation of this invention was explained in full detail, this invention can be variously changed in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Laminated glass 2, 3 Sheet glass 4, 5 Intermediate layer 10 Light control film 12 Upper side laminated body 13 Lower side laminated body 14 Liquid crystal layer 14A Liquid crystal molecule 15 Liquid crystal cell 16, 17 Linearly polarizing plate 18, 19 Retardation film 21A, 21B Base Material 22A, 22B Electrode 23A, 23B Alignment layer 24 Bead spacer 25 Sealing material

Claims (3)

The liquid crystal layer is sandwiched between the first and second stacked bodies including at least an alignment layer, and the liquid crystal molecules are aligned with respect to the liquid crystal layer by driving the electrodes provided in the first and second stacked bodies. In a light control film that controls transmitted light by controlling,
The first laminate is
A base material made of a transparent film material is provided with a bead spacer for maintaining the thickness of the liquid crystal layer,
The first and second laminates are:
The Vickers hardness value B of the portion of the second laminate in contact with the bead spacer is 11.8 or more and 35.9 or less,
In a state where the first laminate is viewed in plan, a multiplication value A × B of an occupation ratio A which is a ratio of an area occupied by the bead spacer on the first laminate and the Vickers hardness value B is: The light control film which is 0.42 or more. A laminated glass formed by sandwiching the light control film according to claim 1 between plate glasses. A first laminate production process for producing a first laminate comprising at least an alignment layer;
A second laminate production process for producing a second laminate comprising at least an alignment layer;
A liquid crystal cell manufacturing process for manufacturing a liquid crystal cell formed by stacking the first stacked body, the liquid crystal layer, and the second stacked body,
The first laminate manufacturing process includes:
The substrate comprises a bead spacer arrangement step of arranging a bead spacer for maintaining the thickness of the liquid crystal layer,
The second laminate manufacturing process includes:
Producing the second laminate so that the Vickers hardness value B of the portion of the second laminate in contact with the bead spacer is 11.8 or more and 35.9 or less,
The bead spacer arranging step includes
In a state where the first laminate is viewed in plan, a multiplication value A × B of an occupation ratio A which is a ratio of an area occupied by the bead spacer on the first laminate and the Vickers hardness value B is: The manufacturing method of the light control film which arrange | positions the said bead spacer so that it may be 0.42 or more.

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