JP2022059466A - Optical member and sun visor - Google Patents

Abstract

To provide an optical member which can be switched between an opaque state and a reflective state, and which makes it difficult to observe light transmitting through the optical member.SOLUTION: An optical member 10 provided herein comprises a light control unit 20 capable of controlling haze by applying voltage, and a reflective member 40 laminated on the light control unit 20. The reflective member 40 comprises a support body 41, a mirror layer 43 supported by the support body 41, and a light-shielding layer 45 disposed on the mirror layer 43 on a side opposite the light control unit 20 side.SELECTED DRAWING: Figure 3

Description

The present invention relates to an optical member and a sun visor having an optical member.

Conventionally, an optical member capable of switching between an opaque state and a reflective state as shown in Patent Document 1 is known. In order to switch between the opaque state and the reflective state, the optical member described in Patent Document 1 has a unit that changes the diffused state of light and a metal layer that reflects light. As a unit that changes the diffusion state of light, a method using a liquid crystal display can be considered. Such an optical member has a quick response to switching between an opaque state and a reflective state. Patent Document 1 proposes to use such an optical member as a sun visor for automobiles and the like.

Japanese Patent Application Laid-Open No. 2002-154324

By the way, even if the optical member described in Patent Document 1 is in a reflective state, the light transmitted through the optical member is observed. That is, the optical member described in Patent Document 1 functions only as a half mirror. The light transmitted through the optical member in the reflected state may deteriorate the visibility of the light reflected by the optical member. Therefore, it is desired to prevent light from passing through the optical member.

The present invention has been made in consideration of such a point, and an object of the present invention is to make it difficult to observe light transmitted through the optical member in an optical member capable of switching between an opaque state and a reflective state.

The optical member of the present invention is
An optical control unit whose haze value can be adjusted by applying voltage,
The light control unit is provided with a reflective member laminated on the light control unit.
The reflective member has a support, a mirror layer supported by the support, and a light-shielding layer arranged on the side of the mirror layer opposite to the side of the optical control unit.

In the optical member of the present invention, the total light reflectance of the optical member observed from the side of the optical control unit with the haze value of the optical control unit lowered may be 90% or more.

In the optical member of the present invention, the diffuse reflectance of the optical member observed from the side of the optical control unit with the haze value of the optical control unit increased may be 30% or more.

In the optical member of the present invention, the ratio of the diffuse reflectance to the total light reflectance of the optical member observed from the side of the optical control unit with the haze value of the optical control unit lowered is 12% or less. You may.

In the optical member of the present invention
The optical control unit has a first electrode arranged on the side of the reflective member, a second electrode arranged on the side opposite to the side of the reflective member, and between the first electrode and the second electrode. With an arranged liquid crystal layer,
The optical member may further include a sealing material that seals the end of the first electrode, the end of the second electrode, and the end of the mirror layer.

In the optical member of the present invention
The first electrode extends from the liquid crystal layer to one side in the second direction, which is non-parallel to the first direction, on one side in the first direction.
The second electrode extends from the liquid crystal layer to one side in the second direction on the other side in the first direction.
The encapsulant seals the end of the mirror layer, the end of the first electrode, and the end of the second electrode on one side and the other side in the first direction and the other side in the second direction. You may stop.

In the optical member of the present invention
At least the second electrode extends from the liquid crystal layer to one side in the second direction, which is non-parallel to the first direction, on the other side in the first direction.
The sealing material may seal the end portion of the mirror layer and the second electrode extending from the liquid crystal layer to one side in the second direction on the other side in the first direction.

In the optical member of the present invention
Further comprising a bonding layer disposed between the optical control unit and the reflective member.
The optical control unit extends from the bonding layer to one side and the other side in the first direction and the other side in the second direction which is non-parallel to the first direction.
The reflective member may extend from the optical control unit to one side and the other side in the first direction and the other side in the second direction.

In the optical member of the present invention
The optical control unit has a first electrode arranged on the side of the reflective member, a second electrode arranged on the side opposite to the side of the reflective member, and between the first electrode and the second electrode. With an arranged liquid crystal layer,
The second electrode extends from the liquid crystal layer to one side in the second direction, which is non-parallel to the first direction, on the other side in the first direction.
The liquid crystal layer may extend from the mirror layer to one side in the second direction on the other side in the first direction.

In the optical member of the present invention
The reflective member further has an insulating layer laminated on the mirror layer.
The mirror layer may be made of a continuous conductive material.

In the optical member of the present invention, the mirror layer may be made of a discontinuous conductive material.

In the optical member of the present invention, the mirror layer may be made of a plurality of laminated insulating materials having different refractive indexes.

The sun visor of the present invention includes any of the above-mentioned optical members.

According to the present invention, in an optical member capable of switching between an opaque state and a reflective state, it is possible to make it difficult to observe the light transmitted through the optical member.

FIG. 1 is a perspective view schematically showing an automobile in which a sun visor equipped with an optical member according to the present invention is arranged. FIG. 2 is a front view of the optical member of the first embodiment. FIG. 3 is a cross-sectional view of the optical member along lines III-III of FIG. FIG. 4 is a cross-sectional view of the optical member along the IV-IV line of FIG. FIG. 5 is a cross-sectional view of the optical member along the VV line of FIG. FIG. 6 is a diagram for explaining an example of the liquid crystal layer of the optical control unit, and is a diagram showing a state in which the liquid crystal molecules are not oriented. FIG. 7 is a diagram for explaining an example of the liquid crystal layer of the optical control unit, and is a diagram showing a state in which the liquid crystal molecules are oriented. FIG. 8 is a diagram for explaining another example of the liquid crystal layer of the optical control unit, and is a diagram showing a state in which the liquid crystal molecules are not oriented. FIG. 9 is a diagram for explaining another example of the liquid crystal layer of the optical control unit, and is a diagram showing a state in which liquid crystal molecules are oriented. FIG. 10 is a cross-sectional view of the optical member of the second embodiment. FIG. 11 is an enlarged front view showing a part of an example of the electrode of the second embodiment. FIG. 12 is a cross-sectional view showing an example of the electrodes of the third embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale and the aspect ratio and the like are appropriately changed from the actual scale and dimensions and exaggerated for the convenience of illustration and comprehension.

FIG. 1 shows a sun visor provided with an optical member 10 as an example to which the optical member 10 of each embodiment is applied. As shown in FIG. 1, in the automobile 1, a sun visor is arranged inside the automobile 1 at a position facing the windshield 5. The sun visor can reduce sunlight and the like incident on the windshield 5 and give a good view to the occupants of the automobile 1.

The optical member 10 is a member capable of switching between a reflective state and an opaque state when observed from one side. In other words, the optical member 10 can switch between a state of reflecting light incident from one side and a state of hiding the state of reflecting light. The reflection state means a state in which when the optical member 10 is observed from one side, the other side is clearly observed as a mirror image. Further, the opaque state means a state in which the field of view through the optical member 10 is unclear. Therefore, the opaque state includes not only a state of blocking light but also a state of diffusing light, for example. Further, the light incident on the optical member 10 from the other side is easily absorbed by the optical member 10. Therefore, when observing the optical member 10 from one side, it is difficult to observe the other side of the optical member 10 regardless of whether the optical member 10 is in a reflective state or an opaque state.

Hereinafter, the first to third embodiments of such an optical member 10 will be described.

<First Embodiment>
FIG. 2 shows a front view of the optical member 10 of the first embodiment. Further, a cross-sectional view taken along line III-III of FIG. 2 is shown in FIG. 3, a cross-sectional view taken along line IV-IV is shown in FIG. 4, and a cross-sectional view taken along line VV is shown in FIG. ing. As shown in FIGS. 2 to 5, the optical member 10 includes an optical control unit 20, a reflective member 40, a bonding layer 50, and a sealing material 60. The reflective member 40 is laminated on the optical control unit 20. The bonding layer 50 is arranged between the optical control unit 20 and the reflecting member 40. The optical member 10 is intended to be observed from the side of the optical control unit 20.

In the example shown in FIG. 2, the optical member 10 has a substantially rectangular shape extending in the second direction d2, which is non-parallel to the first direction d1 and the first direction d1, in the front view. However, the optical member 10 may have an arbitrary shape when viewed from the front. The first direction d1 and the second direction d2 are preferably orthogonal to each other.

The optical control unit 20 can adjust the haze value. Specifically, the optical control unit 20 can switch between a state in which the haze value is 80% or more and a state in which the haze value is 8% or less. By adjusting the haze value of the optical control unit 20 to a high value, the light incident on the optical control unit 20 can be transmitted while being diffused. Further, by adjusting the haze value of the optical control unit 20 to a low value, the light incident on the optical control unit 20 can be transmitted with almost no diffusion. Here, the haze value is expressed by the ratio of the diffusion transmittance to the total light transmittance of the target object, and means the diffusion rate of the light transmitted through the target object. The total light transmittance is the ratio of the amount of light transmitted through the target object to the amount of light entering the target object. The diffusion transmission rate is the ratio of the amount of light that passes through the target object in a direction other than the straight direction, that is, the amount of light that is diffused and transmitted to the light that enters the target object. The total light transmittance and the diffuse transmittance can be measured by a haze meter compliant with JIS K 7361 (for example, manufactured by Murakami Color Technology Laboratory, product number: HM-150).

As shown in FIG. 2, the optical control unit 20 includes a first transparent base material 21, a second transparent base material 22, a first electrode 23 and a second electrode 24, and a liquid crystal layer 30. The first transparent base material 21 and the first electrode 23 are arranged on the side of the reflective member 40. The second transparent base material 22 and the second electrode 24 are arranged on the side opposite to the side of the reflective member 40. The first electrode 23 and the second electrode 24 are arranged between the first transparent base material and the second transparent base material 22. The liquid crystal layer 30 is arranged between the first electrode 23 and the second electrode 24. The thickness of such an optical control unit 20 is, for example, 100 μm or more and 500 μm or less.

The first transparent base material 21 and the second transparent base material 22 are members that support each component of the optical control unit 20. As the material of the first transparent base material 21 and the second transparent base material 22, it is preferable to use a material having flexibility and high visible light transmittance. Examples of the first transparent base material 21 and the second transparent base material 22 include acetyl cellulose-based resins such as triacetyl cellulose (TAC), and polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN). Polyethylene (PE), Polyethylene (PP), Polystyrene, Polymethylpentene, Polymer-based resins such as EVA, Vinyl-based resins such as polyvinyl chloride and polyvinylidene chloride, Acrylic-based resins, Polyurethane-based resins, Polysulfone (PEF), Poly Examples of resins such as ether sulfone (PES), polycarbonate (PC), polysulfone, polyether (PE), polyether ketone (PEK), (meth) acronitrile, cycloolefin polymer (COP), cycloolefin copolymer, etc. In particular, resins such as polycarbonate, cycloolefin polymer, and polyethylene terephthalate are preferable. However, the first transparent base material 21 and the second transparent base material 22 may be thin-film glass. When the first transparent base material 21 and the second transparent base material 22 are colorless and transparent, the visible light transmittance is preferably 90% or more.

The visible light transmission rate is measured at each wavelength in the range of measurement wavelengths of 380 nm to 780 nm using a spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation, JIS K 0115 compliant product). Specified as the average value of transmission.

At least one of the first transparent base material 21 and the second transparent base material 22 is not limited to colorless and transparent, and may be colored and transparent. Alternatively, a colored transparent layer (for example, a hard coat layer) (not shown) may be laminated on at least one of the first transparent base material 21 and the second transparent base material 22. Here, colored transparency means that the transmittance of light in a specific wavelength range is intentionally low, but the transmittance of visible light as a whole is high, specifically, a wavelength of 380 nm to 780 nm. It means that the average transmittance is 50% or more, preferably 60% or more.

Further, in the case of polyethylene terephthalate, for example, the first transparent base material 21 and the second transparent base material 22 preferably have a thickness of 30 μm or more and 250 μm or less. With such a thickness, the first transparent base material 21 and the second transparent base material 22 having excellent strength and optical characteristics can be obtained. The first transparent base material 21 and the second transparent base material 22 may be made of the same material and may be the same, or may be different from each other in at least one of the materials and the constitution.

As shown in FIGS. 2 and 4, the first electrode 23 extends from the liquid crystal layer 30 to one side of the second direction d2 on one side of the first direction d1. Further, as shown in FIGS. 2 and 5, the second electrode 24 extends from the liquid crystal layer 30 to one side of the second direction d2 on the other side of the first direction d1. In the front view of the optical member 10 as shown in FIG. 2, a portion where the first electrode 23 extends to one side of the second direction d2 and a portion where the second electrode 24 extends to one side of the second direction d2. Are offset from each other in the first direction d1. That is, the portion where the first electrode 23 extends to one side of the second direction d2 and the portion where the second electrode 24 extends to one side of the second direction d2 do not overlap each other in the first direction d1. .. Further, in the illustrated example, the first transparent base material 21 also extends from the liquid crystal layer 30 to one side of the second direction d2 along with the first electrode 23. Similarly, along with the second electrode 24, the second transparent base material 22 also extends from the liquid crystal layer 30 to one side in the second direction d2. The length of the first electrode 23 and the second electrode 24 extending from the liquid crystal layer 30 to one side in the second direction d2 is, for example, 3 mm or more and 30 mm or less. The first electrode 23 and the second electrode 24 are portions extending from the liquid crystal layer 30 to one side in the second direction d2, and are connected to the external wiring 7 of the optical member 10, respectively. The first electrode 23 and the second electrode 24 are connected to a control device or the like (not shown) via the wiring 7. Thereby, the first electrode 23 and the second electrode 24 can provide the driving power and the control signal to the liquid crystal layer 30.

The first electrode 23 and the second electrode 24 are a transparent conductor such as indium tin oxide (ITO), poly (3,4-ethylenedioxythiophene): poly (styrene sulfonic acid) (PEDOT: PSS), or the like. It is preferably formed by a colored transparent conductor. In this case, the first electrode 23 and the second electrode 24 are substantially invisible from the outside, and the appearance of the optical member 10 can be improved. Further, particularly when the first electrode 23 and the second electrode 24 are formed by PEDOT: PSS, the material forming the first electrode 23 and the second electrode 24 is used on the first transparent base material 21 and the second transparent base material 22. By coating, the first electrode 23 and the second electrode 24 can be formed. That is, the first electrode 23 and the second electrode 24 can be easily manufactured.

The liquid crystal layer 30 contains liquid crystal molecules. The orientation direction of the liquid crystal molecules contained in the liquid crystal layer 30 is controlled by the electric field generated by the application of the voltage to the first electrode 23 and the second electrode 24. That is, when a voltage is applied to the first electrode 23 and the second electrode 24, the orientation of the liquid crystal molecules in the liquid crystal layer 30 changes. For example, when no voltage is applied to the first electrode 23 and the second electrode 24, the liquid crystal molecules contained in the liquid crystal layer 30 are not oriented. On the other hand, when a voltage is applied to the first electrode 23 and the second electrode 24, the liquid crystal molecules contained in the liquid crystal layer 30 follow the direction of the electric field generated in the liquid crystal layer 30 by the applied voltage. Oriented.

The optical control unit 20 can change the orientation of the liquid crystal molecules in the liquid crystal layer 30 by applying a voltage to the first electrode 23 and the second electrode 24. The degree of diffusion of light transmitted through the liquid crystal layer 30 may change depending on the orientation of the liquid crystal molecules. Thereby, the haze value of the optical control unit 20 can be adjusted by applying a voltage. The liquid crystal layer 30 is, for example, a polymer-dispersed liquid crystal layer (PDLC) having liquid crystal molecules 32 dispersed in the polymer 35 shown in FIGS. 6 and 7, or a tertiary liquid crystal layer 30 shown in FIGS. 8 and 9. It is a polymer network type liquid crystal layer (PNLC) having liquid crystal molecules 32 arranged in voids formed inside a polymer network 36 made of a resin formed in the original network shape. In addition, the polymer dispersion type liquid crystal layer and the polymer network type liquid crystal layer have a normal type in which the haze value is low when no voltage is applied and a reverse type in which the haze value is low when voltage is applied. There is. The liquid crystal layer 30 is not particularly limited, and either a normal type or a reverse type can be adopted.

The liquid crystal layer 30 shown in FIGS. 6 and 7 is a normal type polymer-dispersed liquid crystal layer. The liquid crystal layer 30 has a polymer 35 and a liquid crystal material 31. The polymer 35 is made of a cured resin product. The liquid crystal material 31 is arranged in the space formed in the polymer 35. The space in which the liquid crystal material 31 is housed is dispersed in the polymer 35. In this example, in the state where the voltage shown in FIG. 6 is not applied, the liquid crystal molecules 32 are along the wall surface of the polymer 35 forming the accommodation space of the liquid crystal material 31. That is, the liquid crystal molecules 32 are not oriented. The refractive index of the liquid crystal molecule 32 in the lateral direction is different from the refractive index of the liquid crystal material 31. Therefore, the light transmitted through the liquid crystal layer 30 is refracted by the difference in refractive index between the liquid crystal material 31 and the liquid crystal molecules 32. Since the interface between the liquid crystal material 31 and the liquid crystal molecules 32 is irregularly formed, light is also refracted in an irregular direction. That is, the light transmitted through the liquid crystal layer 30 is diffused. In this way, in a state where no voltage is applied, the liquid crystal layer 30 is in a high haze state and diffuses the transmitted light to make it opaque. On the other hand, in the state where the voltage shown in FIG. 7 is applied, the liquid crystal molecules 32 follow the direction of the electric field generated by the application of the voltage in the accommodation space of the liquid crystal material 31. That is, the liquid crystal molecules 32 are oriented. The refractive index of the liquid crystal molecule 32 in the longitudinal direction is the same as the refractive index of the liquid crystal material 31. Therefore, the light transmitted through the liquid crystal layer 30 passes through the liquid crystal layer 30 without being refracted and thus diffused. In this way, when the voltage is applied, the liquid crystal layer 30 is in a low haze state and becomes transparent. By applying such a voltage, the optical control unit 20 can be adjusted to a state where the haze value is high and a state where the haze value is low.

The liquid crystal layer 30 shown in FIGS. 8 and 9 is a normal type polymer network type liquid crystal layer. The liquid crystal layer 30 has a polymer network 36 and a liquid crystal material 31. The polymer network 36 is made of a cured resin product. The liquid crystal material 31 is arranged in the space formed in the polymer network 36. In this example, in the state where the voltage shown in FIG. 8 is not applied, the liquid crystal molecules 32 are along the wall surface of the polymer network 36 forming the accommodation space of the liquid crystal material 31. That is, the liquid crystal molecules 32 are not oriented. The refractive index of the liquid crystal molecule 32 in the lateral direction is different from the refractive index of the liquid crystal material 31. Therefore, the light transmitted through the liquid crystal layer 30 is refracted by the difference in refractive index between the liquid crystal material 31 and the liquid crystal molecules 32. Since the interface between the liquid crystal material 31 and the liquid crystal molecules 32 is irregularly formed, light is also refracted in an irregular direction. That is, the light transmitted through the liquid crystal layer 30 is diffused. In this way, in a state where no voltage is applied, the liquid crystal layer 30 is in a high haze state and diffuses the transmitted light to make it opaque. On the other hand, in the state where the voltage shown in FIG. 9 is applied, the liquid crystal molecules 32 follow the direction of the electric field generated by the application of the voltage in the accommodation space of the liquid crystal material 31. That is, the liquid crystal molecules 32 are oriented. The refractive index of the liquid crystal molecule 32 in the longitudinal direction is the same as the refractive index of the liquid crystal material 31. Therefore, the light transmitted through the liquid crystal layer 30 passes through the liquid crystal layer 30 without being refracted and thus diffused. In this way, when the voltage is applied, the liquid crystal layer 30 is in a low haze state and becomes transparent. By applying such a voltage, the optical control unit 20 can be adjusted to a state where the haze value is high and a state where the haze value is low.

In the normal type liquid crystal layer 30, the positive type liquid crystal molecule 32 is used. On the other hand, in the reverse type liquid crystal layer 30, the negative type liquid crystal molecule 32 is used, and the liquid crystal layer 30 is formed by a pair of alignment films capable of exerting an orientation restricting force with respect to the liquid crystal molecule 32 and maintaining vertical orientation. Sandwiched.

Since the optical control unit 20 is colored with the haze value maximized, preferably black, the reflectance of the optical control unit 20 can be reduced. The light control unit 20 can be colored, for example, by having a colored transparent layer. The colored transparent layer may be at least one of the first transparent base material 21 and the second transparent base material 22, or a hard coat laminated on at least one of the first transparent base material 21 and the second transparent base material 22. It may be a layer. Further, the first electrode 23 and the second electrode 24 may be colored and transparent.

Alternatively, the liquid crystal layer 30 may contain the dichroic dye 33. In the examples shown in FIGS. 6 to 9, the dichroic dye 33 is arranged in the polymer 35 or in the voids formed inside the polymer network 36, similarly to the liquid crystal molecule 32. Like the liquid crystal molecule 32, the dichroic dye 33 follows the wall surface of the polymer 35 and the wall surface of the polymer network 36 in a state where no voltage is applied. At this time, the liquid crystal layer 30 is in a high haze state and further exhibits the color of the dichroic dye 33. The dichroic dye 33 can have various colors depending on the material thereof, but is preferably black. On the other hand, in the state where the voltage is applied, the dichroic dye 33 follows the direction of the electric field generated by the application of the voltage. At this time, the liquid crystal layer 30 is in a low haze state and does not exhibit the color of the dichroic dye 33. That is, the liquid crystal layer 30 becomes transparent.

When the liquid crystal layer 30 does not contain the dichroic dye 33, the total light transmittance of the optical control unit 20 is 70% or more in a state where a voltage is applied to the liquid crystal layer 30, that is, in a low haze state. It is preferable that the total light transmittance of the optical control unit 20 is 50% or more in a state where no voltage is applied to the liquid crystal layer 30, that is, in a high haze state. When the liquid crystal layer 30 contains the dichroic dye 33, the light control unit 20 of the optical control unit 20 is in a state where a voltage is applied to the liquid crystal layer 30, that is, in a state where the haze is low and the dichroic dye 33 does not exhibit color. The total light transmittance is preferably 20% or more. Further, the total light transmittance of the optical control unit 20 is 10% or more in a state where no voltage is applied to the liquid crystal layer 30, that is, in a state of high haze and a state in which the dichroic dye 33 exhibits color. Is preferable.

The reflection member 40 reflects the light incident from the light control unit 20 side. As shown in FIGS. 3 to 5, the reflective member 40 has a support 41, a mirror layer 43, a light-shielding layer 45, and an insulating layer 47. The mirror layer 43 is supported by the support 41, and in particular, in the illustrated example, the mirror layer 43 is supported on the side of the optical control unit 20 of the support 41. The light-shielding layer 45 is arranged on the side opposite to the side of the light control unit 20 of the mirror layer 43. In the illustrated example, the light shielding layer 45 is arranged between the support 41 and the mirror layer 43. The insulating layer 47 is laminated on the mirror layer 43 on the side of the optical control unit 20. That is, in the illustrated example, the support 41 is arranged away from the optical control unit 20 from the mirror layer 43. Specifically, the insulating layer 47, the mirror layer 43, the light-shielding layer 45, and the support 41 are laminated in this order from the side of the optical control unit 20. By stacking the components of the reflective member 40 in this order, it is possible to reduce the reflection of the interface inside the reflective member 40. However, the support 41 may be arranged closer to the optical control unit 20 than the mirror layer 43, which is limited to the illustrated example. In this case, the support 41, the insulating layer 47, the mirror layer 43, and the light-shielding layer 45 are laminated in this order from the side of the optical control unit 20.

As shown in FIGS. 3 to 5, the reflective member 40 extends from the optical control unit 20 on the other side of the first direction d1 and on one side and the other side of the second direction d2. The length L1 in which the reflective member 40 extends from the optical control unit 20 on the other side of the first direction d1 and on one side and the other side of the second direction d2 is preferably 0.1 mm or more and 0.8 mm or less, and more. It is preferably 0.2 mm or more and 0.6 mm or less.

The support 41 is a member that supports each component of the reflective member 40. The material of the support 41 is preferably flexible. When the support 41 is arranged closer to the optical control unit 20 than the mirror layer 43, the support 41 has a high visible light transmittance, specifically, a visible light transmittance of 90% or more. It is preferable to use. Examples of such a support 41 include an acetyl cellulose resin such as triacetyl cellulose (TAC), a polyester resin such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene (PE), and polypropylene (PP). Polyethylene-based resins such as polystyrene, polymethylpentene and EVA, vinyl-based resins such as polyvinyl chloride and polyvinylidene chloride, acrylic resins, polyurethane-based resins, polysulfone (PEF), polyether sulfone (PES), polycarbonate (PC) ), Polysulfones, polyether (PE), polyether ketones (PEK), (meth) acronitrile, cycloolefin polymers (COP), cycloolefin copolymers and other resins, and in particular, polycarbonates and cycloolefin polymers. , Polyethylene terephthalate and other resins are preferred. However, the support 41 may be a thin film of glass.

The mirror layer 43 is a thin-film member that reflects incident light, particularly specularly. The thickness of the mirror layer 43 is, for example, 0.001 μm or more and 1 μm or less. In the first embodiment, the mirror layer 43 is made of a continuous conductive material. Therefore, any one end and the other end of the mirror layer 43 are conductive. As a specific material of the mirror layer 43, for example, aluminum can be mentioned.

As shown in FIGS. 4 and 5, the mirror layer 43 is located inside the liquid crystal layer 30 on one side of the second direction d2. In other words, the liquid crystal layer 30 extends from the mirror layer 43 to one side of the second direction d2. The length of the liquid crystal layer 30 extending from the mirror layer 43 to one side of the second direction d2 is, for example, 0.1 mm or more and 0.8 mm or less, preferably 0.2 mm or more and 0.6 mm or less.

The light-shielding layer 45 suppresses the side of the reflective member 40 from being seen through when the optical member 10 is observed from the side of the optical control unit 20. Further, the light-shielding layer 45 suppresses the side of the optical control unit 20 from being seen through when the optical member 10 is observed from the side of the reflective member 40. The light-shielding layer 45 is arranged on the side opposite to the side of the light control unit 20 of the mirror layer 43. Since the light-shielding layer 45 absorbs incident light, it is preferably dark, particularly black. The thickness of the light-shielding layer 45 is, for example, 1 μm or more and 20 μm or less. Such a light-shielding layer 45 contains, for example, light-absorbing particles in a binder resin. Examples of the light absorbing particles include black pigments such as carbon black and titanium black.

The insulating layer 47 prevents the first electrode 23 and the second electrode 24 of the optical control unit 20 from being electrically connected to the mirror layer 43 and causing a short circuit. The insulating layer 47 is laminated on the mirror layer 43, and preferably covers the entire mirror layer 43. Further, the insulating layer 47 preferably has a high visible light transmittance. Specifically, the visible light transmittance of the insulating layer 47 is preferably 90% or more. The thickness of the insulating layer 47 is, for example, 0.001 μm or more and 1 μm or less. Such an insulating layer 47 is made of, for example, silicon dioxide.

The joining layer 50 joins the optical control unit 20 and the reflecting member 40. The bonding layer 50 is a so-called OCA (Optically Clear Adaptive) or OCR (Optically Clear Resin). That is, the bonding layer 50 is transparent and has adhesiveness. The joint layer 50 preferably has a thickness of 25 μm or more and 1000 μm or less. If the thickness is thinner than 25 μm, the strain of the optical member 10 cannot be absorbed by the joint surface, so that bubbles and defects of the optical member (for example, color unevenness due to a defective liquid crystal GAP) are likely to occur. On the other hand, if the thickness is thicker than 1000 μm, it is disadvantageous in terms of mass productivity, price and strength.

As shown in FIGS. 3 to 5, the bonding layer 50 is located inside the optical control unit 20 on one side and the other side of the first direction d1 and the other side of the second direction d2. In other words, the optical control unit 20 extends from the bonding layer 50 to one side and the other side of the first direction d1 and the other side of the second direction d2. The length L2 of the optical control unit 20 extending from the bonding layer 50 to one side and the other side of the first direction d1 and the other side of the second direction d2 is preferably 0.1 mm or more and 0.8 mm or less, and more. It is preferably 0.2 mm or more and 0.6 mm or less.

The sealing material 60 is made of a material having an insulating property. The sealing material 60 prevents the mirror layer 43 from being electrically connected to the first electrode 23 and the second electrode 24 of the optical control unit 20 to cause a short circuit. For example, if a foreign substance having conductivity such as water droplets adheres between the end portion 43e of the mirror layer 43 and the end portion 23e of the first electrode 23 and the end portion 24e of the second electrode 24, the mirror layer 43 and the optical control unit The first electrode 23 and the second electrode 24 of 20 are electrically connected and short-circuited. In order to suppress such a short circuit, the sealing material 60 seals the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the end portion 43e of the mirror layer 43. That is, the sealing material 60 covers the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the end portion 43e of the mirror layer 43. In particular, as shown in FIGS. 3 to 5, the sealing material 60 has the end portions 43e of the mirror layer 43 on one side and the other side of the first direction d1 and the other side of the second direction d2. The end portion 23e of the first electrode 23 and the end portion 24e of the second electrode 24 are sealed. Further, as shown in FIG. 4, the sealing material 60 extends from the end portion 43e of the mirror layer 43 and the liquid crystal layer 30 to one side of the second direction d2 on one side of the first direction d1. The second electrode 24 is sealed. Further, as shown in FIG. 5, the sealing material 60 is a first electrode extending from the end portion 43e of the mirror layer 43 and the liquid crystal layer 30 to one side of the second direction d2 on the other side of the first direction d1. 23 is sealed. That is, as shown in FIG. 2, the sealing material 60 surrounds the optical control unit 20 and the reflective member 40 in a circumferential shape when viewed from the front. It is preferable that the sealing material 60 covers the end portion 43e of the mirror layer 43, the end portion 23e of the first electrode 23, and the end portion 24e of the second electrode 24 without gaps over the entire circumference thereof.

Examples of the material of the encapsulant 60 include an alicyclic epoxy having an epoxy terminal, an acryloyl, a methacryloyl, a urethane terminal, and a thiol end, an alicyclic methacrylic, an alicyclic acryloyl, an ethylene-polyvinyl alcohol copolymer, and a polyamide. Examples thereof include resins, polyvinyl alcohols, polyvinylidene chlorides, polyolefins, polyester polyols and the like.

It is preferable that the optical member 10 has a sufficiently high total light reflectance in the reflected state. Specifically, the total light reflectance of the optical member 10 observed from the side of the optical control unit 20 in a state where the haze value of the optical control unit 20 is low is preferably 90% or more, preferably 95% or more. It is more preferable to have.

Further, it is preferable that the optical member 10 has a sufficiently high specular reflectance in a reflective state. Specifically, the ratio of the diffuse reflectance to the total light reflectance of the optical member 10 observed from the side of the optical control unit 20 with the haze value of the optical control unit 20 lowered is 12% or less. It is preferably 5% or less, and more preferably 5% or less.

Further, it is preferable that the optical member 10 has a sufficiently high diffuse reflectance in an opaque state. Specifically, the diffuse reflectance of the optical member 10 observed from the side of the optical control unit 20 in a state where the haze value of the optical control unit 20 is high is preferably 30% or more, preferably 40% or more. Is more preferable.

Here, the total light reflectance means a reflectance that combines the reflectances of specular reflection and diffuse reflection, in other words, the reflectance in the SCI (Specular Component Include) method. Further, the diffuse reflectance means the reflectance of only the diffuse reflection that does not include specular reflection, in other words, the reflectance in the SCE (Specular Component Exclude) method. The total light reflectance and the diffuse reflectance can be measured using a measuring device compliant with JIS Z 8722, for example, a spectrocolor meter / color difference meter (CM-700d manufactured by Konica Minolta).

Next, the operation of the optical member 10 will be described. In the action of the optical member 10 described below, the liquid crystal layer 30 of the optical control unit 20 is a normal type polymer dispersion type liquid crystal layer. Further, it is assumed that the optical member 10 is observed from the side of the optical control unit 20. For example, when such an optical member 10 is used for a sun visor as shown in FIG. 1, the side of the optical control unit 20 is arranged inside the vehicle facing the occupant, and the side of the reflecting member 40 is located outside the vehicle facing the windshield 5. Be placed. Therefore, the operation of the optical member 10 when the optical member 10 is observed from the side of the optical control unit 20 will be described.

When no voltage is applied to the first electrode 23 and the second electrode 24, the liquid crystal layer 30 is in a high haze state. Therefore, the light incident on the side of the optical control unit 20 of the optical member 10 from the outside passes through the optical control unit 20 while being diffused by the liquid crystal layer 30. After that, the light is incident on the reflecting member 40. A part of the light incident on the reflecting member 40 passes through the mirror layer 43 and is absorbed by the light shielding layer 45. The other part of the light incident on the reflecting member 40 is reflected by the mirror layer 43 and is incident on the optical control unit 20 again. The light incident on the optical control unit 20 passes through the optical control unit 20 while being diffused by the liquid crystal layer 30. As described above, when no voltage is applied to the first electrode 23 and the second electrode 24, the optical member 10 is observed from the side of the optical control unit 20 as cloudy due to the diffusion of light. That is, the optical member 10 is in an opaque state.

When a voltage is applied to the first electrode 23 and the second electrode 24, the liquid crystal layer 30 is in a low haze state. Therefore, the light incident on the side of the optical control unit 20 of the optical member 10 from the outside passes through the optical control unit 20 with almost no diffusion. After that, the light is incident on the reflecting member. A part of the light incident on the reflecting member 40 passes through the mirror layer 43 and is absorbed by the light shielding layer 45. The other part of the light incident on the reflecting member 40 is reflected by the mirror layer 43 and is incident on the optical control unit 20 again. The light incident on the optical control unit 20 is hardly diffused and passes through the optical control unit 20. As described above, when the voltage is applied to the first electrode 23 and the second electrode 24, the optical member 10 is observed by reflecting light from the side of the optical control unit 20. That is, the optical member 10 is in a reflective state.

In this way, the optical member 10 can be switched between the opaque state and the reflective state by applying the voltage to the first electrode 23 and the second electrode 24.

By the way, in the optical member described in Patent Document 1, the light incident on the optical member from the side opposite to the side of the unit that changes the diffusion state of light can pass through the metal layer. Therefore, even if the optical member is in a reflective state, the light transmitted through the optical member is observed. That is, the optical member is only in a semi-reflecting and semi-transmissive state, in other words, in a half mirror state. When observing a mirror image due to reflection with the optical member in a reflective state, if light transmitted through the optical member is observed, the visibility of the mirror image is deteriorated.

Further, in the optical member described in Patent Document 1, the light incident on the optical member from the side opposite to the side of the unit that changes the diffusion state of the light can be reflected by the metal layer. When such an optical member is used as a sun visor as described in Patent Document 1, sunlight incident on the optical member from the side opposite to the side of the unit that changes the diffused state of light, that is, from the side of the windshield. The external light such as is reflected by the metal layer and may be directed to an oncoming vehicle of a vehicle provided with a sun visor, for example. In this case, the light reflected by the metal layer may deteriorate the visibility of a third party such as an oncoming vehicle occupant.

On the other hand, in the optical member 10 of the first embodiment, the reflective member 40 has a light-shielding layer 45 arranged on the side opposite to the side of the optical control unit 20 of the mirror layer 43. Therefore, the light incident on the optical member 10 from the side of the reflecting member 40 is absorbed by the light shielding layer 45 before reaching the mirror layer 43 of the reflecting member 40. Therefore, it is difficult to observe the side of the reflective member 40 from the side of the optical control unit 20 of the optical member 10. Further, since the light incident on the optical member 10 from the side of the reflective member 40 is absorbed by the light shielding layer 45 before reaching the mirror layer 43, the light incident on the side of the reflective member 40 reflected by the mirror layer 43 is absorbed. Very few. Therefore, for example, when the optical member 10 is used as a sun visor, the external light incident on the optical member from the windshield 5 side is reflected by the mirror layer 43, and the visibility of the occupants of the oncoming vehicle is hardly deteriorated.

Further, the total light reflectance of the optical member 10 observed from the side of the optical control unit 20 with the haze value of the optical control unit 20 lowered is 90% or more. That is, the optical member 10 in the reflected state can sufficiently reflect the light incident from the light control unit 20 side. As described above, the optical member 10 can fully exert the function of reflecting light in the reflected state.

Further, the diffuse reflectance of the optical member 10 observed from the side of the optical control unit 20 with the haze value of the optical control unit 20 increased is 30% or more. That is, the optical member 10 in an opaque state can reflect the light incident from the light control unit 20 side while sufficiently diffusing it. As described above, the optical member 10 can fully exert the function of diffuse-reflecting light to make it opaque in an opaque state.

On the other hand, for example, when the optical control unit can adjust the visible light transmittance instead of the haze value, when the visible light transmittance of the optical control unit is lowered, the optical member is observed dark. However, the light reflected at the interface of each layer included in the optical control unit can be observed. That is, the light that overlaps with the dark optical member and is reflected by the optical member can be observed as so-called black light. As described above, even if the optical member is in an opaque state, there may be a problem that the reflected light is observed. Therefore, it is preferable that the optical control unit 20 has an adjustable haze value as in the first embodiment. Further, it is preferable that the diffuse reflectance is high so that the light reflected by the optical member 10 is not observed in the opaque state of the optical member 10.

Further, the ratio of the diffuse reflectance to the total light reflectance of the optical member 10 observed from the side of the optical control unit 20 with the haze value of the optical control unit 20 lowered is 12% or less. That is, the optical member 10 in the reflected state does not diffuse most of the light incident from the light control unit 20 side, and reflects a large amount of light in a regular manner. As described above, the optical member 10 hardly diffuses and reflects light to be clouded in the reflected state, and can fully exert the function of reflecting light.

By the way, in the optical member 10, the mirror layer 43 of the reflective member 40 is made of a continuous conductive material such as aluminum. Therefore, if a foreign substance having conductivity such as water droplets adheres between the end portion 23e of the first electrode 23 and the end portion 24e of the second electrode 24 and the end portion 43e of the mirror layer 43, the mirror layer 43 and the first. The electrode 23 and the second electrode 24 are electrically connected and short-circuited. Such a short circuit can hinder the switching between the opaque state and the reflective state of the optical member 10. Therefore, it is desired to suppress a short circuit.

The optical member 10 of the first embodiment has a sealing material 60 that seals the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the end portion 43e of the mirror layer 43. .. According to such a sealing material 60, it is possible to prevent foreign matter from adhering to the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the end portion 43e of the mirror layer 43. That is, the sealing material 60 can prevent a short circuit from occurring at the end 23e of the first electrode 23, the end 24e of the second electrode 24, and the end 43e of the mirror layer 43.

In particular, the encapsulant 60 is the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the mirror layer 43 on one side and the other side of the first direction d1 and the other side of the second direction d2. The end 43e is sealed. On one side and the other side of the first direction d1 and the other side of the second direction d2, the length of the mirror layer 43 extending from the first electrode 23 and the second electrode 24 is relatively small. Therefore, on one side and the other side of the first direction d1 and the other side of the second direction d2, foreign matter is found on the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the end portion 43e of the mirror layer 43. Is likely to cause a short circuit between the first electrode 23 and the second electrode 24 and the mirror layer 43. Therefore, on one side and the other side of the first direction d1 and the other side of the second direction d2, the end portion 23e of the first electrode 23, the end portion 24e of the second electrode 24, and the end portion 43e of the mirror layer 43 are sealed. By sealing with the stopper 60, it is effective that a short circuit occurs due to the adhesion of foreign matter at the end 23e of the first electrode 23, the end 24e of the second electrode 24, and the end 43e of the mirror layer 43. Can be suppressed.

Further, the sealing material 60 seals the end portion 43e of the mirror layer 43 and the second electrode 24 extending from the liquid crystal layer 30 on the other side of the first direction d1. When a foreign substance adheres to any part of the second electrode 24 extending on the other side of the first direction d1 and the end portion 43e of the mirror layer 43, the second electrode 24 and the mirror layer 43 may be short-circuited. Therefore, by sealing the end portion 24e of the second electrode 24 and the end portion 43e of the mirror layer 43 with the sealing material 60 on the other side of the first direction d1, the end portion 24e of the second electrode 24 and the mirror At the end portion 43e of the layer 43, it is possible to effectively suppress the occurrence of a short circuit due to the adhesion of foreign matter.

Further, the optical control unit 20 extends from the bonding layer 50 to one side and the other side of the first direction d1 and the other side of the second direction d2, and the reflective member 40 extends from the optical control unit 20 to the first direction d1. It extends to one side and the other side and the other side of the second direction d2. Since the optical control unit 20 extends from the bonding layer 50 to one side and the other side of the first direction d1 and the other side of the second direction d2, foreign matter adheres to the bonding layer 50 due to the adhesiveness of the bonding layer 50. It is possible to prevent it from being stored. This makes it possible to suppress a short circuit due to the adhesion of foreign matter. Further, since the reflective member 40 extends from the optical control unit 20 to one side and the other side of the first direction d1 and the other side of the second direction d2, the end portions 23e of the first electrode 23 and the second electrode 24 It is possible to prevent the end portion 24e from being unintentionally connected to an external conductor. This makes it possible to suppress a short circuit between the first electrode 23 and the second electrode 24.

The second electrode 24 extends from the liquid crystal layer 30 to one side of the second direction d2 on the other side of the first direction d1. The liquid crystal layer 30 extends from the mirror layer 43 to one side of the second direction d2 on the other side of the first direction d1. Even if foreign matter adheres to the optical member 10 on the other side of the first direction d1, it is hindered by the liquid crystal layer 30, so that the foreign matter connects the end portion 24e of the second electrode 24 and the end portion 43e of the mirror layer 43. It is hard to be done. That is, it is possible to effectively suppress the occurrence of a short circuit due to the adhesion of foreign matter at the end portion 24e of the second electrode 24 and the end portion 43e of the mirror layer 43.

Further, the insulating layer 47 is laminated on the mirror layer 43. The insulating layer 47 can effectively prevent the mirror layer 43 from being electrically connected to the first electrode 23, the second electrode 24, and an external conductor. Therefore, the short circuit caused by the mirror layer 43 can be effectively suppressed.

As described above, the optical member 10 of the first embodiment includes an optical control unit 20 whose haze value can be adjusted by applying a voltage, and a reflection member 40 laminated on the optical control unit 20, and reflects light. The member 40 has a support 41, a mirror layer 43 supported by the support 41, and a light-shielding layer 45 arranged on the side opposite to the side of the optical control unit 20 of the mirror layer 43. According to such an optical member 10, the light incident on the optical member 10 from the side of the reflective member 40 is absorbed by the light-shielding layer 45 before reaching the mirror layer 43 of the reflective member 40. In this way, in the optical member 10 capable of switching between the opaque state and the reflective state, it is possible to make it difficult to observe the light transmitted through the optical member 10.

<Second embodiment>
Next, the optical member 10 of the second embodiment will be described with reference to FIGS. 10 and 11. It should be noted that, in the optical member 10 of the second embodiment, the portion that can be configured in the same manner as that of the first embodiment described above is the reference numeral used for the corresponding portion in the first embodiment described above. The same reference numerals will be used, and duplicate explanations will be omitted.

FIG. 10 is a cross-sectional view of the optical member 10 of the second embodiment corresponding to FIG. As shown in FIG. 10, in the optical member 10 of the second embodiment, the reflective member 40 does not have the insulating layer 47 unlike the optical member of the first embodiment described above. Further, the mirror layer 43 is made of a discontinuous conductive material. An example of such a mirror layer 43 in front view is shown in FIG. As shown in FIG. 11, the mirror layer 43 is discontinuously formed on the support 41 and the light-shielding layer 45. In particular, in the example shown in FIG. 11, the mirror layer 43 is irregularly arranged in an irregular shape. However, not limited to the illustrated example, the mirror layer 43 may be regularly arranged, and each portion of the mirror layer 43 may have an arbitrary shape. Examples of the mirror layer 43 arranged in this way include an indium film formed by thin film deposition. Further, the thickness of such a mirror layer 43 is, for example, 0.001 μm or more and 1 μm or less so as to enable reflection of light and to be formed as a discontinuous film.

Since the mirror layer 43 is discontinuous, one end and the other end of the mirror layer 43 are not conductive. Therefore, it is possible to effectively prevent the first electrode 23, the second electrode 24, and the external conductor from being electrically connected to other conductive members via the mirror layer 43. Therefore, the short circuit caused by the mirror layer 43 can be effectively suppressed.

<Third embodiment>
Next, the optical member 10 of the third embodiment will be described with reference to FIG. 12. Also in the optical member 10 of the third embodiment, the reference numerals used for the corresponding portions in the above-mentioned first embodiment with respect to the portions that can be configured in the same manner as the above-mentioned first embodiment. The same code as the above will be used, and duplicate description will be omitted.

The optical member 10 of the third embodiment does not have the insulating layer 47 like the optical member 10 of the second embodiment shown in FIG. Further, as shown in FIG. 12, the mirror layer 43 is made of a plurality of laminated insulating materials 43a having different refractive indexes. In particular, the mirror layer 43 is formed by alternately laminating resin materials having a high refractive index and resin materials having a low refractive index having different thicknesses. Such a mirror layer 43 can reflect light due to the difference in refractive index at the interface between the insulating materials 43a. The thickness of such a mirror layer 43 is, for example, 100 μm or more and 150 μm or less.

Since the mirror layer 43 is made of an insulating material, the mirror layer 43 does not conduct. Therefore, it is possible to effectively prevent the first electrode 23, the second electrode 24, and the external conductor from being electrically connected to other conductive members via the mirror layer 43. Therefore, the short circuit caused by the mirror layer 43 can be effectively suppressed.

The optical member 10 of the first to third embodiments described above can be installed inside a moving body such as an automobile or in a building.

Aspects of the present invention are not limited to the individual embodiments described above, but include various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the above-mentioned contents. That is, various additions, changes and partial deletions are possible without departing from the conceptual idea and purpose of the present invention derived from the contents defined in the claims and their equivalents.

1 Automotive 7 Wiring 10 Optical member 20 Optical control unit 21 1st transparent base material 22 2nd transparent base material 23 1st electrode 23e End 24 2nd electrode 24e End 30 Liquid crystal layer 40 Reflective member 41 Support 43 Mirror layer 43e End 45 Light-shielding layer 47 Insulation layer 50 Bonding layer 60 Encapsulant

Claims (13)

An optical control unit whose haze value can be adjusted by applying voltage,
The light control unit is provided with a reflective member laminated on the light control unit.
The reflective member is an optical member having a support, a mirror layer supported by the support, and a light-shielding layer arranged on the side of the mirror layer opposite to the side of the optical control unit. The optical member according to claim 1, wherein the total light reflectance of the optical member observed from the side of the optical control unit is 90% or more in a state where the haze value of the optical control unit is lowered. The optical member according to claim 1 or 2, wherein the diffuse reflectance of the optical member observed from the side of the optical control unit is 30% or more in a state where the haze value of the optical control unit is increased. The ratio of the diffuse reflectance to the total light reflectance of the optical member observed from the side of the optical control unit with the haze value of the optical control unit lowered is 12% or less, according to claims 1 to 3. The optical member according to any one of the items. The optical control unit has a first electrode arranged on the side of the reflective member, a second electrode arranged on the side opposite to the side of the reflective member, and between the first electrode and the second electrode. With an arranged liquid crystal layer,
The optical member according to any one of claims 1 to 4, further comprising a sealing material for sealing the end portion of the first electrode, the end portion of the second electrode, and the end portion of the mirror layer. Optical member. The first electrode extends from the liquid crystal layer to one side in the second direction, which is non-parallel to the first direction, on one side in the first direction.
The second electrode extends from the liquid crystal layer to one side in the second direction on the other side in the first direction.
The encapsulant seals the end of the mirror layer, the end of the first electrode, and the end of the second electrode on one side and the other side in the first direction and the other side in the second direction. The optical member according to claim 5, which is stopped. At least the second electrode extends from the liquid crystal layer to one side in the second direction, which is non-parallel to the first direction, on the other side in the first direction.
5. The sealing material seals the end of the mirror layer and the second electrode extending from the liquid crystal layer to one side in the second direction on the other side of the first direction. Or the optical member according to 6. Further comprising a bonding layer disposed between the optical control unit and the reflective member.
The optical control unit extends from the bonding layer to one side and the other side in the first direction and the other side in the second direction which is non-parallel to the first direction.
The optical member according to any one of claims 1 to 7, wherein the reflective member extends from the optical control unit to one side and the other side in the first direction and the other side in the second direction. The optical control unit has a first electrode arranged on the side of the reflective member, a second electrode arranged on the side opposite to the side of the reflective member, and between the first electrode and the second electrode. With an arranged liquid crystal layer,
The second electrode extends from the liquid crystal layer to one side in the second direction, which is non-parallel to the first direction, on the other side in the first direction.
The optical member according to any one of claims 1 to 8, wherein the liquid crystal layer extends from the mirror layer to one side in the second direction on the other side in the first direction. The reflective member further has an insulating layer laminated on the mirror layer.
The optical member according to any one of claims 1 to 9, wherein the mirror layer is made of a continuous conductive material. The optical member according to any one of claims 1 to 9, wherein the mirror layer is made of a discontinuous conductive material. The optical member according to any one of claims 1 to 9, wherein the mirror layer is made of a plurality of laminated insulating materials having different refractive indexes. A sun visor comprising the optical member according to any one of claims 1 to 12.

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