JP2017125882A - screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen that presents an image clearly visible as much as possible.SOLUTION: A screen 1 is constituted by a light-transmitting plate member, and an image is projected onto an inner surface S1 of the screen. The screen 1 includes: a first resin layer 2 that is a polarizing layer composed of a polarizer; and second resin layers 3A, 3B disposed on either surface of the first resin layer 2, which are resin layers essentially comprising a polycarbonate resin and having a thickness of 0.2 mm or more and a retardation of 2400 nm or more and 6000 nm or less, arranged in such a manner that a slow axis of the resin layer is in the same direction as an absorption axis of the polarizing layer. When reflected light CL is incident to an outer surface S2, the screen 1 can suppress transmission of the reflected light CL to the inner surface S1.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a screen.

  2. Description of the Related Art In recent years, a head-up display device that is mounted and used in an automobile is known (for example, see Patent Document 1). The head-up display device described in Patent Document 1 irradiates red (R), green (G), and blue (B) laser beams from a laser light source, and uses the windshield as a screen to display an image on the screen. Can be formed.

  However, for example, when the reflected light reflected by asphalt or the hood of an automobile passes through the windshield, there is a problem that it becomes difficult to see an image on the screen due to the transmitted reflected light.

JP2015-225244A

  The objective of this invention is providing the screen which can visually recognize an image as clearly as possible.

Such an object is achieved by the present inventions (1) to (16) below.
(1) A screen composed of a plate member having optical transparency, on which an image is projected on one surface of the plate member,
A polarizing layer composed of a polarizer;
A polarizing layer provided on at least one surface side of the polarizing layer, mainly composed of a polycarbonate resin, having a thickness of 0.2 mm or more and a retardation of 2400 nm or more and 6000 nm or less, the slow axis of which is the polarizing layer And a resin layer arranged to be in the same direction as the absorption axis of
A screen characterized by suppressing transmission of the external light to the one surface of the plate member when external light is incident on the other surface opposite to the one surface of the plate member.

  (2) The screen according to (1), wherein the plate member is curved so that the one surface side is concave and the other surface side is convex.

(3) Used in an upright state,
The screen according to (1) or (2), wherein the absorption axis is inclined within a range of ± 45 degrees with respect to a horizontal direction.

  (4) The screen according to any one of (1) to (3), wherein the resin layer is in a state in which a sheet material mainly composed of the polycarbonate resin is stretched in one direction.

  (5) The screen according to any one of (1) to (4), wherein the resin layer has a thickness of 3.0 mm or less.

(6) The screen according to any one of (1) to (5), wherein the resin layer is provided on both sides of the polarizing layer.
(7) The screen according to (6), wherein the resin layers have the same thickness.

  (8) The screen according to (6) or (7), wherein one resin layer among the resin layers contains a metal oxide.

  (9) The screen according to (8), further including a hard coat layer which is provided on the resin layer containing the metal oxide and is mainly composed of an ultraviolet curable resin.

  (10) The screen according to (8) or (9), wherein the screen is used so that the resin layer side containing the metal oxide faces the incident side of the external light.

  (11) The screen according to any one of (1) to (10), wherein the polarizing layer is mainly composed of a polyvinyl alcohol resin.

  (12) The screen according to (11), wherein the polarizing layer is in a state in which a sheet material mainly composed of the polyvinyl alcohol resin is stretched in one direction.

  (13) The screen according to any one of (1) to (12), wherein a thickness of the polarizing layer is 0.01 mm or more and 0.03 mm or less.

  (14) The screen according to any one of (1) to (13), further including a bonding layer that bonds the polarizing layer and the resin layer.

  (15) The screen according to any one of (1) to (14), wherein the total thickness of the plate member is 0.6 mm or more and 5.0 mm or less.

  (16) The screen according to any one of (1) to (15), which is used as a combiner.

  According to the present invention, an image can be visually recognized as clearly as possible.

FIG. 1 is a side view showing an embodiment when the screen of the present invention is applied to a combiner. FIG. 2 is an enlarged cross-sectional view of a region [A] surrounded by an alternate long and short dash line in FIG. FIG. 3 is a perspective view of the screen in FIG. 4 is a cross-sectional view taken along line BB in FIG. FIG. 5 is a cross-sectional view taken along line CC in FIG. FIG. 6 is an enlarged cross-sectional view of the screen in FIG.

  Hereinafter, the screen of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

  FIG. 1 is a side view showing an embodiment when the screen of the present invention is applied to a combiner. FIG. 2 is an enlarged cross-sectional view of a region [A] surrounded by an alternate long and short dash line in FIG. FIG. 3 is a perspective view of the screen in FIG. 4 is a cross-sectional view taken along line BB in FIG. FIG. 5 is a cross-sectional view taken along line CC in FIG. FIG. 6 is an enlarged cross-sectional view of the screen in FIG. In the following, for convenience of explanation, the upper side in FIGS. 1 to 4 and 6 is referred to as “upper” or “upper”, and the lower side is referred to as “lower” or “lower”. Further, the left side in FIGS. 1 and 2 is referred to as “front” or “front”, and the right side is referred to as “rear” or “rear”. Further, in FIG. 6, for easy understanding, the screen is illustrated in a flat state, and the thickness direction is exaggerated and schematically illustrated.

  As shown in FIGS. 1 and 2, the automobile 100 is equipped with a head-up display 10. The head-up display 10 is built in the upper part of the dashboard 101.

  A screen 1 used as a combiner is disposed between the head-up display 10 and the windshield 102. When the head-up display 10 is used, the “combiner” refers to an image (video) projected on the screen 1 from the head-up display 10 and the windshield 102, that is, the scenery in front of the driver H. Say what you want to see. The screen 1 is supported on the dashboard 101 via a support portion (not shown) in a standing state.

  As shown in FIG. 2, the head-up display 10 includes a light source 11, a reflecting member 12, and a storage body 13.

  The light source 11 can independently irradiate laser beams LS of red (R), green (G), and blue (B) colors. An image can be formed by controlling the irradiation timing of the laser light LS of each color while scanning the light source 11.

  The reflecting member 12 is configured by a prism, for example, and can reflect the laser light LS from the light source 11. The laser beam LS reflected by the reflecting member 12 is projected on the screen 1. The projection light is recognized by the driver H as the image (see FIGS. 1 and 2).

  As illustrated in FIG. 2, the storage body 13 has a box shape and can store therein the light source 11, the reflection member 12, and other components constituting the head-up display 10. The storage body 13 has a window portion 131 that is configured by an opening that opens toward the windshield 102. The laser beam LS is emitted through the window 131 toward the outside of the storage body 13, that is, toward the screen 1.

  In addition, a transparent cover member 14 is installed on the window 131 of the housing 13 so as to cover the window 131. Thereby, it is possible to prevent foreign matters such as dust and dust from entering the storage body 13 through the window 131, so that the lens of the light source 11 and the reflecting member 12 are clouded or soiled by the foreign matter. Can be prevented.

  As shown in FIGS. 3 and 6, the screen 1 is composed of a light-transmissive plate member. The screen 1 has one surface (hereinafter referred to as “inner surface S1”) on the driver H side, that is, the inner side (rear), the other surface opposite to the one surface (hereinafter referred to as “outer surface S2”). Is arranged so as to face the windshield 102 side, that is, the outside (front).

  As shown in FIGS. 3 to 5, the screen 1 is curved so that the inner surface S1 side is concave and the outer surface S2 side is convex. Thereby, the laser beam LS emitted from the head-up display 10 toward the inner surface S1 is reflected by the inner surface S1, and is visually recognized as an image by the driver H (see FIGS. 1 and 2). .

On the inner surface S1, the average curvature k ₁ along the vertical direction (see FIG. 4) is different from the average curvature k ₂ along the horizontal direction (see FIG. 5). The average curvature k ₁ is larger than the average curvature k _{2 in the} configuration shown in FIGS. 4 and 5, but may be smaller than the average curvature k ₂ .

  As shown in FIG. 6, the screen 1 includes a first resin layer 2, a second resin layer 3A and a second resin layer 3B, a bonding layer 4A and a bonding layer 4B, a hard coat layer 5A and a hard coat. It is a laminated board provided with the layer 5B. Hereinafter, each layer will be described.

The first resin layer 2 is an intermediate layer located at the center in the thickness direction of the screen 1, and the thickness t ₂ is a constant portion in the surface direction of the screen 1.

  The first resin layer 2 is mainly composed of polyvinyl alcohol (PVA) resin. In this embodiment, the 1st resin layer 2 dye | stains the dichroic dye represented by iodine, a dichroic dye, etc. to polyvinyl alcohol resin, and bridge | crosslinked with the boron compound etc. In addition, the content of the polyvinyl alcohol resin in the first resin layer 2 is preferably 0.2% or more and 8% or less, and more preferably 0.5% or more and 5% or less.

The first resin layer 2 is obtained by processing a sheet material (film) made of the constituent material. That is, the sheet material is a sheet material thicker than the thickness t ₂ of the first resin layer 2 on the screen 1, and the stretched state in which the sheet material is stretched in one direction until the thickness t ₂ is reached. Thus, the first resin layer 2 is used (obtained). Thereby, the 1st resin layer 2 turns into a polarizing layer which functions as a polarizer.

The thickness _{t 2,} not particularly limited, for example, 0.01 mm or more, and preferably not more than 0.03 mm. If the thickness _{t 2} is less than 0.01 mm, there is the first resin layer 2 is can not be achieved sufficiently function as a polarizer, also the thickness _{t 2} is even beyond 0.03 mm, it The improvement of the function as the above polarizer cannot be expected.

  The refractive index of the first resin layer 2 is not particularly limited and is, for example, preferably 1.52 or more and 1.67 or less, and more preferably 1.54 or more and 1.60 or less.

  As shown in FIG. 6, the second resin layer 3A is disposed on the left surface 21 side of the first resin layer 2, and the second resin layer 3B is disposed on the right surface 22 side. Yes. The second resin layer 3A and the second resin layer 3B have the same configuration except that the arrangement location is different and the second resin layer 3A includes the metal oxide particles 31. The second resin layer 3A will be described representatively.

  The second resin layer 3A is mainly composed of a polycarbonate resin. The polycarbonate resin preferably has a weight average molecular weight of 19000 or more and 40000 or less, and more preferably 19500 or more and 35000 or less. Accordingly, the second resin layer 3A has, for example, sufficient impact resistance.

The second resin layer 3 </ b> A is obtained by processing a polycarbonate resin sheet material containing the metal oxide particles 31. That is, the sheet material is a sheet material that is thicker than the thickness t _3A of the second resin layer 3A on the screen 1, and the sheet material is stretched in one direction until reaching the thickness t _3A. Thus, the second resin layer 3A is used. Accordingly, the second resin layer 3A has retardation (birefringence index × thickness). For example, the retardation is preferably 2400 nm or more and 6000 nm or less, and more preferably 3000 nm or more and 5600 nm or less.

The thickness t _3A (the same applies to the thickness t _3B of the second resin layer 3B) is 0.2 mm or more and 3.0 mm or less, preferably 0.3 mm or more and 2.5 mm or less. If the thickness t _3A is less than 0.2 mm, it may not be expected that the second resin layer 3A has the retardation. On the other hand, when the thickness t _3A exceeds 3.0 mm, the weight of the screen 1 increases and installation may be difficult. Further, the thickness t _3A and the thickness t _3B may be different, but are preferably the same. When the thickness t _3A and the thickness t _3B are the same, there is an advantage that the occurrence of warpage is small when exposed to a high temperature.

  The second resin layer 3 </ b> A having such a configuration and the second resin layer 3 </ b> B having the configuration in which the particles 31 are omitted from the second resin layer 3 </ b> A have the slow axis of the first resin layer 2. It arrange | positions so that it may become the same direction as an absorption axis. The “slow axis” is an orientation in which the traveling speed of light passing through the second resin layer 3A or the second resin layer 3B is slow (the phase is delayed), and on the contrary, the traveling speed of light. The direction in which the phase is fast (the phase advances) is called the “fast axis” of the phaser. The deviation between the slow axis and the absorption axis is allowed up to ± 5 degrees. Further, the absorption axis may be inclined as long as it is within ± 45 degrees with respect to the polarization direction emitted from the head-up display 10.

  By the way, as shown in FIG. 1, while the automobile 100 is running, the automobile 100 has reflected light CL reflected by sunlight (natural light) on the hood 103 of the automobile 100 or the road surface 200 on which the automobile 100 runs. May be incident. Then, as shown in FIG. 6, the reflected light CL enters the outer surface S <b> 2 of the screen 1 so as to pass through the screen 1. The reflected light CL is S-polarized light. In the screen 1, the absorption axis of the first resin layer 2 is in the S direction, and as described above, the second resin layer 3A and the second resin layer 3A in the same direction as the absorption axis. There are slow axes of the second resin layer 3B. As a result, the reflected light CL is absorbed by the screen 1 and transmission to the inner surface S1 is suppressed, so that the driver H can visually recognize the image on the screen 1 as clearly as possible. Further, the light LS emitted from the head-up display 10 is reflected to the driver H side of the screen 1 and information to the driver H is provided. On the other hand, the light LS that has not been reflected is absorbed by the first resin layer 2 and is reduced to an extent that does not substantially cause a double image. Thus, the screen 1 functions as a polarizing plate.

  Further, as described above, the second resin layer 3 </ b> A and the second resin layer 3 </ b> B are provided on both sides of the first resin layer 2, respectively. Compared to the case where the second resin layer 3 </ b> A or the second resin layer 3 </ b> B is provided on one side of the first resin layer 2, this configuration is a head-up that transmits the reflected light CL and the windshield 102 side. This contributes to maintaining the function of absorbing the light LS of the display 10 under the environment in the vehicle.

  The refractive index of the second resin layer 3A or the second resin layer 3B is not particularly limited, and is preferably 1.58 or more and 1.60 or less, for example, 1.585 or more and 1.595 or less. It is more preferable that

  As shown in FIG. 6, metal oxide particles 31 are dispersed and contained in the second resin layer 3A. The particle 31 is an IR (Infrared Rays) cut material that can absorb infrared rays contained in sunlight. Thereby, for example, the temperature rise of the screen 1 under hot weather can be suppressed, and deformation or deterioration due to heat can be prevented.

  Further, the screen 1 has the second resin layer 3A side containing the metal oxide particles 31 facing the windshield 102, that is, the incident side of the reflected light CL, and the second resin layer 3B side is the incident side of the laser beam LS. To face. Accordingly, it is possible to prevent the metal oxide particles 31 from interfering with the image and reducing the visibility of the image as much as possible.

  Further, the first resin layer 2 and the second resin layer 3A are bonded via the bonding layer 4A, and the first resin layer 2 and the second resin layer 3B are bonded via the bonding layer 4B. Has been. The bonding layer 4A and the bonding layer 4B are various adhesives or pressure-sensitive adhesives such as a urethane adhesive, an epoxy adhesive, an acrylic adhesive, and an acrylic pressure-sensitive adhesive. Thereby, each layer can be reliably joined, and the screen 1 can endure long-term use.

The thickness t _{4A of} the bonding layer _4A and the thickness t _4B of the bonding layer 4B are not particularly limited, and are preferably 0.005 mm or more and 0.02 mm or less, for example, 0.006 mm or more and 0.015 mm. The following is more preferable. If the thickness t _4A and the thickness t _4B are less than 0.005 mm, the adhesive force may be reduced. Further, even if the thickness t _4A and the thickness t _4B exceed 0.02 mm, it is more than that. Cannot improve the adhesive strength. Further, the thickness t _4A and the thickness t _4B may be different but are preferably the same.

  The refractive index of the bonding layer 4A and the bonding layer 4B is not particularly limited, and is preferably 1.46 or more and 1.55 or less, and more preferably 1.461 or more and 1.545 or less. .

  A hard coat layer 5A is provided on the second resin layer 3A. Thereby, it is possible to protect the second resin layer 3A that is relatively easily damaged. The hard coat layer 5A is formed by applying a varnish-like material to be the hard coat layer 5A on the second resin layer 3A and irradiating the applied material with ultraviolet rays.

  Similarly, the hard coat layer 5B is provided on the second resin layer 3B. Thereby, it is possible to protect the second resin layer 3B that is relatively easily damaged. The hard coat layer 5B is also formed by applying a varnish-like material to be the hard coat layer 5B on the second resin layer 3B and irradiating the applied material with ultraviolet rays. In the screen 1, the hard coat layer 5B can be omitted.

  The hard coat layer 5A and the hard coat layer 5B are each composed of an ultraviolet curable resin. Examples of the ultraviolet curable resin include an ultraviolet curable resin mainly composed of an acrylic compound, a urethane acrylate oligomer, or a polyester urethane acrylate. Examples thereof include an ultraviolet curable resin mainly composed of at least one selected from the group consisting of an ultraviolet curable resin having an oligomer as a main component, an epoxy resin, and a vinylphenol resin. Among these, an ultraviolet curable resin containing an acrylic compound as a main component is preferable. Thereby, adhesiveness with each resin layer can be improved.

The thickness t _{5A of} the hard coat layer 5A and the thickness t _5B of the hard coat layer 5B are not particularly limited, and are preferably 0.002 mm or more and 0.020 mm or less, for example, 0.003 mm or more, 0 More preferably, it is not more than .015 mm. Further, the thickness t _5A and the thickness t _5B may be different but are preferably the same.

  The refractive index of the hard coat layer 5A or the hard coat layer 5B is not particularly limited, and is preferably 1.40 or more and 1.60 or less, for example, 1.450 or more and 1.595 or less. More preferred.

Screen 1 configured as described above, the total thickness _{t 1,} for example, 0.4mm or more, preferably at 5.0mm or less, or more 0.65 mm, and more preferably 4.0mm or less. Thereby, the screen 1 can be made as thin as possible. Further, the screen 1 has a rigidity that can withstand normal use in the automobile 100 and can maintain a curved shape.

  The screen 1 has a rectangular shape in a plan view, and preferably has a length of 50 mm or more and 200 mm or less, more preferably 60 mm or more and 190 mm or less, and a width of 100 mm or more and 400 mm or less. It is preferable that it is 130 mm or more and 380 mm or less.

  As mentioned above, although the screen of the present invention has been described with respect to the illustrated embodiment, the present invention is not limited to this, and each part constituting the screen is replaced with an arbitrary structure that can exhibit the same function. can do. Moreover, arbitrary components may be added.

  In addition, the screen of the present invention may be a combination of any two or more configurations (features) of the above embodiments.

  Moreover, although the 2nd resin layer is provided in both surfaces of the 1st resin layer, respectively, the screen is not limited to this, You may abbreviate | omit one 2nd resin layer.

DESCRIPTION OF SYMBOLS 1 Screen 2 1st resin layer 21, 22 surface 3A, 3B 2nd resin layer 31 Particle | grains 4A, 4B Bonding layer 5A, 5B Hard-coat layer 10 Head-Up Display
11 light source 12 reflector 13 container 131 window portion 14 cover member 100 automobile 101 dashboard 102 windshield 103 hood 200 road H driver k _{1, k 2} mean curvature LS laser beam CL reflected light t ₁ the total thickness t _2, t _3A , _t3B , _t4A , _t4B , _t5A , _t5B thickness S1 inner surface S2 outer surface

Claims (16)

The screen is composed of a plate member having light permeability, and an image is projected on one surface of the plate member,
A polarizing layer composed of a polarizer;
A polarizing layer provided on at least one surface side of the polarizing layer, mainly composed of a polycarbonate resin, having a thickness of 0.2 mm or more and a retardation of 2400 nm or more and 6000 nm or less, the slow axis of which is the polarizing layer And a resin layer arranged to be in the same direction as the absorption axis of
A screen characterized by suppressing transmission of the external light to the one surface of the plate member when external light is incident on the other surface opposite to the one surface of the plate member.   The screen according to claim 1, wherein the plate member is curved so that the one surface side is concave and the other surface side is convex. It is used in a standing state,
The screen according to claim 1, wherein the absorption axis is inclined within a range of ± 45 degrees with respect to a horizontal direction.   The screen according to any one of claims 1 to 3, wherein the resin layer is in a state in which a sheet material mainly composed of the polycarbonate resin is stretched in one direction.   The screen according to claim 1, wherein the resin layer has a thickness of 3.0 mm or less.   The screen according to claim 1, wherein the resin layer is provided on each side of the polarizing layer.   The screen according to claim 6, wherein the resin layers have the same thickness.   The screen according to claim 6 or 7, wherein one resin layer among the resin layers contains a metal oxide.   The screen according to claim 8, further comprising a hard coat layer that is provided on the resin layer containing the metal oxide and is mainly composed of an ultraviolet curable resin.   The screen according to claim 8 or 9, wherein the resin layer side containing the metal oxide is used so as to face the incident side of the external light.   The screen according to any one of claims 1 to 10, wherein the polarizing layer is mainly composed of a polyvinyl alcohol resin.   The screen according to claim 11, wherein the polarizing layer is in a state in which a sheet material mainly composed of the polyvinyl alcohol resin is stretched in one direction.   The screen according to any one of claims 1 to 12, wherein the polarizing layer has a thickness of 0.01 mm or more and 0.03 mm or less.   The screen of any one of Claims 1 thru | or 13 provided with the joining layer which joins the said polarizing layer and the said resin layer.   The screen according to claim 1, wherein the total thickness of the plate members is 0.6 mm or more and 5.0 mm or less.   The screen according to claim 1, which is used as a combiner.

Images