JP6065142B1 - Light control film, laminated glass, and method for manufacturing light control film - Google Patents

Abstract

The reliability of a spacer is further improved as compared with the conventional one. 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 orientation of the liquid crystal molecules 14A related to the liquid crystal layer 14 by driving 22B and 22A. The first laminate 13 is provided with a spacer 24 for maintaining the thickness of the liquid crystal layer 14 on a base material 21B made of a transparent film material. The first and second laminates 13 and 12 are spacers 24 having a Vickers hardness value Xs. Is 16.9 or more and 40.2 or less, and the Vickers hardness value Xf of the site | part of the 2nd laminated body 12 which the front-end | tip of the spacer 24 contacts is 11.8 or more and 35.9 or less. [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, the spacer has a configuration widely used in image display panels, and is manufactured in a column shape using, for example, a photoresist.

  By the way, in the conventional light control film, a spacer may be crushed by the pressing force etc. in use, or the front end of the spacer may penetrate into the opposite surface. As a result, the conventional light control film may have a nonuniform cell gap or a local alignment failure, which may make it difficult to perform uniform light control. In some cases, the liquid crystal material leaked out. As a result, the conventional light control film still has a practically insufficient problem with respect to the reliability of the spacer.

  As one method for solving this problem, a method of increasing the number of spacers or increasing the number of spacers may be considered. However, in this case, there are problems that the transmittance is lowered, the orientation of the liquid crystal is lowered, and further, the diffracted light from the spacer is observed.

JP 03-47392 A Japanese Patent Laid-Open No. 08-184273

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

  The present inventor has intensively studied to solve the above-mentioned problems, and has come up with the idea that the Vickers hardness value Xs of the spacer and the Vickers hardness value Xf of the surface with which the spacer tip abuts are selected, respectively. It came to be 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 spacer that holds the thickness of the liquid crystal layer is provided on the substrate made of a transparent film material,
The first and second laminates are:
The Vickers hardness value Xs of the spacer is 16.9 or more and 40.2 or less, and the Vickers hardness value Xf of the portion of the second laminated body with which the tip of the spacer contacts is 11.8 or more and 35.9 or less. A light control film.

  According to (1), the Vickers hardness value Xs of the spacer is 16.9 or more and 40.2 or less, and the Vickers hardness value Xf of the portion of the second laminated body with which the tip of the spacer abuts is 11.8 or more and 35. .9 or less reduces the situation in which the tip of the spacer penetrates into the opposite surface due to the pressing force during use, etc., reducing the occurrence of nonuniform cell gaps and local alignment failure In addition, leakage of the liquid crystal material can be effectively avoided. Further, it is possible to reduce the damage to the base material and to reduce the occurrence of cracks when the whole is bent. By these, the reliability regarding a spacer can be improved further compared with the past.

  (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 the reliability regarding a spacer further 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 includes a spacer manufacturing process for manufacturing a spacer that maintains the thickness of the liquid crystal layer,
The spacer manufacturing process includes
The spacer is manufactured so that the Vickers hardness value Xs of the spacer is 16.9 or more and 40.2 or less,
The second laminate manufacturing process includes:
A method for producing a light control film, wherein the second laminate is produced such that a Vickers hardness value Xf of a portion of the second laminate in contact with a tip of the spacer is 11.8 or more and 35.9 or less.

  According to (3), the Vickers hardness value Xs of the spacer is 16.9 or more and 40.2 or less, and the Vickers hardness value Xf of the part of the second laminated body with which the tip of the spacer contacts is 11.8 or more and 35. .9 or less reduces the situation in which the tip of the spacer penetrates into the opposite surface due to the pressing force during use, etc., reducing the occurrence of nonuniform cell gaps and local alignment failure In addition, leakage of the liquid crystal material can be effectively avoided. Further, it is possible to reduce the damage to the base material and to reduce the occurrence of cracks when the whole is bent. By these, the reliability regarding a 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 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 respectively provided the intermediate | middle layers 4 and 5 with the light control film 10, and the heating-pressing process which heats and pressurizes the resulting laminated body 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 it on the part where such light control is intended, for example, when it is placed on the rear window of a vehicle, a window glass of a building, a showcase, an indoor transparent partition, etc., to switch between transparent and opaque, etc. It is.

  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. In the light control film 10, a spacer 24 for keeping the thickness of the liquid crystal layer 14 constant is provided in the upper laminate 12 and / or the lower laminate 13. 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, you may manufacture the light control film 10 by a guest host system, and in this case, a linearly-polarizing plate is arrange | positioned at 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.

  For example, when 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 linear polarizing plate 16 and / or 17 is opposite to the liquid crystal cell 15. A protective layer such as a hard coat layer is provided on this 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 this case, the alignment layers 23A and 23B are manufactured by manufacturing various material layers applicable to the alignment layer such as polyimide, and then manufacturing a fine line-shaped uneven shape on the surface of the material layer by rubbing using a rubbing roll. Formed. 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 spacer 24 is provided in order to define the thickness of the liquid crystal layer 14, and various resin materials can be widely applied. In this embodiment, the spacer 24 is manufactured from a photoresist. The spacer 24 is manufactured by applying a photoresist on the base material 21B formed by manufacturing the transparent electrode 22B, and exposing and developing. The 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 spacer 24 may be provided on the alignment layer 23B. As the spacer, a so-called bead spacer may be applied.

  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 14 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 be widely applied. it can. 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 manufacturing step SP2-2, the coating liquid (photoresist) relating to the spacer 24 is applied, and then the spacer 24 is manufactured by drying, exposing and developing. Subsequently, in the alignment layer manufacturing step SP2-3, the coating liquid for the alignment layer 23B is applied and dried, and then cured by irradiation with ultraviolet rays, whereby the alignment layer 23B is manufactured. 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 the frame-shaped portion to arrange the upper laminate 12 and the lower laminate. The body 13 is laminated and pressed to cure the sealing material 25 by irradiation of ultraviolet rays or the like, whereby the liquid crystal cell 15 is manufactured. 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 spacer]
Here, in this embodiment, the spacer 24 is formed in a cylindrical shape or a truncated cone shape using a photoresist by the process shown in FIG. Thus, the spacer 24 is manufactured, and in this embodiment, the Vickers hardness value Xs of the spacer 24 is 16.9 or more and 40.2 or less, and the portion of the second laminate 12 where the tip of the spacer 24 abuts. The Vickers hardness value Xf is set to be 11.8 or more and 35.9 or less, thereby further improving the reliability of the spacer as compared with the conventional case. In addition, the value of Vickers hardness is a measured value under the conditions described in the following examples.

  That is, when the Vickers hardness value Xf of the portion of the second laminated body 12 with which the tip of the spacer 24 abuts is less than 11.8, the tip of the spacer 24 penetrates into the opposite surface due to the pressing force during use. In addition, the cell gap becomes non-uniform or local alignment failure occurs. Further, in this case, the base material 21A is scratched by contact or the like at the time of assembling the spacer 24, or a crack is generated when the whole is bent.

  In addition, when the Vickers hardness value Xs of the spacer 24 is less than 16.9, the spacer 24 is crushed by the external pressure, the cell gap is reduced, and a desired cell gap cannot be obtained. Even if the Vickers hardness value Xs of the spacer 24 exceeds 40.2, or the Vickers hardness value Xf of the portion of the second laminate 12 with which the tip of the spacer 24 abuts exceeds 35.9, the cell The gap may be reduced, and scratches and cracks may occur.

  However, the Vickers hardness value Xs of the spacer 24 is 16.9 or more and 40.2 or less, and the Vickers hardness value Xf of the portion of the second laminate 12 with which the tip of the spacer 24 abuts is 11.8 or more and 35.9 or less. If it is set to be such that these problems can be solved at once, the reliability of the spacer can be further improved as compared with the conventional case.

〔Test results〕
Tables 1 and 2 are charts showing test results used for confirming the configuration related to the spacer. The examples and comparative examples in Tables 1 and 2 are configured identically except that the configurations related to the spacer and the alignment layer with which the spacer abuts are different. More specifically, in the light control films of these examples and comparative examples, the spacer 24 is provided only on the lower laminate 13, and the Vickers hardness value Xs of the spacer 24 is changed according to the manufacturing conditions related to the spacer 24. It was. Further, the Vickers hardness value Xf of the portion of the second laminate 12 with which the tip of the spacer 24 abuts was changed according to the conditions for manufacturing the alignment layer 23A.

  That is, the spacer 24 is coated with the coating liquid related to the spacer 24, dried, and then selectively exposes a portion for manufacturing the spacer 24 by mask exposure using an exposure apparatus. Note that this is a case of a positive type photoresist. On the contrary, in the case of a negative type photoresist, a part other than the part for producing the spacer 24 is selectively exposed. After that, the spacer 24 is selectively removed at an unexposed portion or exposed portion by development processing, and processing such as rinsing is performed, and processing such as drying is performed as necessary.

  In this exposure process, exposure may be performed in a so-called half-cure state by heating in advance or in a heated environment. In the development process, after rinsing or the like is performed, the heat treatment is performed. May accelerate the reaction. The hardness Xs of the spacer 24 is set by selecting the photoresist material related to the spacer 24, setting the heating temperature and time in the coating process, exposure process, and development process, exposure light quantity and exposure time, and setting the mask cap. Can do.

  In this embodiment, the Vickers hardness value Xs of the spacer 24 is 14.8, 16.9, 22.2, 40.2, and 51.4 depending on the setting of the heating temperature and time in the exposure process and the development process, respectively. A certain lower laminate 13 was produced (Table 3). The hardness is a measurement value obtained by setting the production conditions of the spacer 24 to manufacture the lower laminated body 13, and once manufacturing the light control film 10 using the lower laminated body 13 and then disassembling and measuring it. . In addition, this measurement is a measurement result based on an average value of 10 points which are obtained by measuring 12 points with each light control film and excluding the maximum value and the minimum value.

The spacer 24 was manufactured in a cylindrical shape having a diameter of 9 μm and a height of 6 μm. Further, they were regularly arranged at a pitch of 110 μm in two directions orthogonal to the in-plane direction of the base material 21B. Therefore, the ratio (occupancy ratio) occupied by the spacers 24 on the base material 21B is 0.5% (= ((9/2) ² × 3) / (110) ² ).

  Increasing the occupation ratio reduces the stress applied to each spacer, thereby reducing the phenomenon that the spacer 24 is crushed or the tip penetrates. However, increasing the occupation ratio deteriorates the transmittance. Or the shading rate deteriorates. However, when the occupation ratio is small, optical characteristics such as transmittance and light shielding ratio can be secured, but it is unavoidable that the spacer 24 is crushed or the tip penetrates. Thus, the occupation ratio is desirably 0.5% or more and 10% or less.

  On the other hand, the alignment layer 23A of the upper laminate 12 on which the spacer abuts is manufactured by applying a coating liquid, drying, and heat-curing. Vickers hardness value Xf was set by setting temperature, heating time, and the like. Thereby, in the Example and the comparative example, the upper side laminated body 12 whose Vickers hardness value Xf is 10.2, 11.8, 24.8, 35.9, 38.5 was manufactured (Table 4). For the hardness Xf, the upper laminate 12 having different hardness is produced for the orientation layer 23A of the upper laminate 12 which is a surface with which the spacer contacts by setting the creation conditions of the orientation layer 23A. After the light control film 10 is once manufactured by the above, it is a measured value obtained by disassembling and measuring. Moreover, it is a measurement result by the average value of 10 points which are measured at 12 points and remain except for the maximum value and the minimum value.

  The Vickers hardness values Xs and Xf were measured using a 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.

  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 the light control film placed on a smooth surface having high hardness by a surface plate, a load corresponding to 0.8 MPa was applied, and then the cell gap was measured to reduce the cell gap. Judged. The weighting time is 24 hours. After weighting in this manner, the upper laminate and the lower laminate are peeled off, the spacer is observed with a microscope, the spacer is crushed, the cell gap is reduced, and the part where the spacer contacts is Observation of the tip of the spacer was observed with a microscope.

  Here, for observation with this microscope, a front view, a perspective view, and a cross-section are observed using a method such as SEM, and the deformation of the spacer is visually confirmed. When the deformation of the spacer is confirmed, according to the situation, “ The presence or absence of “cell gap reduction, spacer crushing” was judged as “Good”. Therefore, in Tables 1 and 2, “◯” indicates a case where no abnormality relating to the corresponding item is observed, and “X” indicates a case where abnormality relating to the corresponding item is observed.

  Similarly, when the part where the spacer abuts is perspective using a technique such as SEM, if a depression (recess) is confirmed, “film penetration” is determined as “x”, and if a recess is not recognized, “film” “Intrusion” was determined as “◯”.

  Further, in the state where the laminates 12 and 13 were laminated and a load corresponding to 0.1 MPa was applied, the relative positions of the laminates 12 and 13 were displaced by 0.1 cm / sec, and the occurrence of scratches was confirmed visually. Here, when scratches are confirmed in more than half of the multiple samples, “scratch (film)” is indicated by “x”, and conversely, scratches are not confirmed in more than half of the multiple samples. In this case, “scratches” are 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 cracks are confirmed in the substrate in more than half of the multiple samples, “crack (film)” is indicated by “x”, and conversely, in more than half of the multiple samples, the substrate In the case where no crack is confirmed, “crack” is indicated by “◯”.

  In the measurement results of Tables 1 and 2, when the Vickers hardness value Xs of the spacer 24 is less than 16.9 (Comparative Examples 5 and 7), a decrease in the cell gap is observed. Intrusion, scratches, and cracks at the spacer tips were observed. Further, when the Vickers hardness value Xf of the portion of the second laminate 12 with which the tip of the spacer 24 abuts is less than 11.8 (Comparative Example 1 and Comparative Example 3), scratches and cracks are observed, and Comparative Example In 3, the penetration of the spacer tip into the film was observed.

  When the Vickers hardness value Xs of the spacer 24 exceeds 40.2 (Comparative Example 6 and Comparative Example 8), in Comparative Example 6, a decrease in cell gap and penetration of the spacer tip into the film were observed. Scratches were observed. Further, when the Vickers hardness value Xf of the portion of the second laminate 12 with which the tip of the spacer 24 abuts exceeds 35.9 (Comparative Example 2 and Comparative Example 4), a decrease in cell gap and scratches are observed, and further comparison is made. In Example 4, cracks were observed.

  However, in Examples 1-13, in these phenomena, it was not observed and it was confirmed that the reliability regarding the spacer can be sufficiently secured.

[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 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 spacer that holds the thickness of the liquid crystal layer is provided on the substrate made of a transparent film material,
The first and second laminates are:
The Vickers hardness value Xs of the spacer is 16.9 or more and 40.2 or less, and the Vickers hardness value Xf of the portion of the second laminated body with which the tip of the spacer contacts is 11.8 or more and 35.9 or less. There is a light control film. 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 includes a spacer manufacturing process for manufacturing a spacer that maintains the thickness of the liquid crystal layer,
The spacer manufacturing process includes
The spacer is manufactured so that the Vickers hardness value Xs of the spacer is 16.9 or more and 40.2 or less,
The second laminate manufacturing process includes:
A method for producing a light control film, wherein the second laminate is produced such that a Vickers hardness value Xf of a portion of the second laminate in contact with a tip of the spacer is 11.8 or more and 35.9 or less.

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