Optical plate base material, optical plate, aerial image forming device, and method for manufacturing optical plate base material

Abstract

To provide an optical plate base material for forming an aerial image with high resolution.SOLUTION: The optical plate base material includes a plate body having a first surface provided with a plurality of ridges extending in a first direction and arranged in a second direction, the plurality of ridges each having a vertical surface on a first side surface and an inclined surface on a second side surface. A height dimension d of the vertical surface and a distance p between the vertical surfaces of adjacent ridges satisfies d / p>5.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an optical plate base, an optical plate, an aerial imaging device, and a method for manufacturing an optical plate base. [Background technology]

[0002] Conventionally, an aerial imaging device has been known that focuses an image displayed on a display unit of an image display device on an imaging plane in the air and displays the image (hereinafter referred to as an aerial image) on the imaging plane, as disclosed in Patent Document 1. Such an aerial imaging device has a transparent imaging unit that focuses an image displayed on the display unit as an aerial image. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-67071 Summary of the Invention [Problem to be solved by the invention]

[0004] In an aerial imaging device such as that described above, it is desirable that the aerial image have high resolution.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide an optical plate base material, an optical plate, and an aerial imaging device that can improve the resolution of an aerial image. [Means for solving the problem]

[0006] One aspect of the optical plate base material according to the present invention is a plate body having a first surface with a plurality of ridges extending in a first direction and aligned in a second direction; Each of the plurality of protrusions has a vertical surface on a first side surface and an inclined surface on a second side surface, The height dimension d of the vertical surface and the distance p between the vertical surfaces of adjacent ridges satisfy d / p>5. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an optical plate base material, an optical plate, and an aerial imaging device that can improve the resolution of an aerial image. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic cross-sectional view of a non-contact input device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a functional block diagram showing the functional configuration of the non-contact input device. [Figure 3] FIG. 3 is a schematic plan view of the lower plate. [Figure 4] FIG. 4 is a schematic cross-sectional view of the lower plate taken along line C1-C1 in FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view showing one of the protrusions. [Figure 6] FIG. 6 is a schematic cross-sectional view of the imaging unit. [Figure 7] FIG. 7 is a schematic diagram for explaining the action and effect of this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an example of an optical plate base material, an optical plate, and an aerial imaging device according to the present invention will be described in detail with reference to the drawings. Note that the optical plate base material, the optical plate, and the aerial imaging device described below are examples of the optical plate base material, the optical plate, and the aerial imaging device according to the present invention, and the present invention is not limited to the embodiments described below.

[0010] [Embodiment] The configuration of the non-contact input device 1 will be described with reference to Figures 1 to 7. The non-contact input device 1 corresponds to an example of an aerial imaging device.

[0011] 1 is a schematic cross-sectional view of a non-contact input device 1. The non-contact input device 1 is a device equipped with a so-called aerial display, which can project information and images into the air.

[0012] Such a non-contact input device 1 is used as a terminal for a user U to input information or a terminal for a user U to obtain information in various places (stores, public facilities, medical facilities, factories, etc.).

[0013] Specifically, the non-contact input device 1 may be used as an accounting terminal or a reception terminal, or as an operation input terminal for inputting operation inputs to various devices.

[0014] In the following description, when describing the structure of the non-contact input device 1 and each of the components that make up the non-contact input device 1, the Cartesian coordinate system (X, Y, Z) shown in FIG. 1 may be used. The X direction corresponds to the front-to-rear direction of the non-contact input device 1. The positive side of the X direction corresponds to the front side of the non-contact input device 1. The negative side of the X direction corresponds to the rear side of the non-contact input device 1.

[0015] Moreover, the Y direction corresponds to the left-right direction and width direction of the non-contact input device 1. The + side of the Y direction corresponds to the left side when the non-contact input device 1 is viewed from the front of the non-contact input device 1. The - side of the Y direction corresponds to the right side when the non-contact input device 1 is viewed from the front of the non-contact input device 1.

[0016] The Z direction corresponds to the up-down direction of the non-contact input device 1. The positive Z direction corresponds to the upper side of the non-contact input device 1. The negative Z direction corresponds to the lower side of the non-contact input device 1.

[0017] The non-contact input device 1 includes a housing 2, a display unit 3, an imaging unit 4, an input detection unit 5 (see FIG. 2), and a control unit 6.

[0018] Non-contact input device 1 according to this embodiment is a so-called horizontally placed non-contact input device. In the case of a horizontally placed non-contact input device, aerial image G1 is displayed above non-contact input device 1, as shown in Fig. 1. Note that the non-contact input device is not limited to a horizontally placed non-contact input device.

[0019] The non-contact input device may be a so-called vertically-placed non-contact input device. A vertically-placed non-contact input device has a configuration similar to that of non-contact input device 1 shown in Fig. 1 rotated 90° clockwise in Fig. 1. In the case of a vertically-placed non-contact input device, aerial image G1 is displayed in front of non-contact input device 1.

[0020] The housing 2 is box-shaped and is a member for housing or supporting each element that constitutes the non-contact input device 1. In this embodiment, the housing 2 is a rectangular parallelepiped that is long in the front-rear direction.

[0021] However, the shape of the housing is not limited to the shape of the housing 2 of this embodiment. The shape of the housing may be determined appropriately depending on the environment in which the non-contact input device 1 is installed. The shape of the housing 2 is not limited to a box shape. The shape of the housing 2 may be various shapes that can accommodate or support each element that constitutes the non-contact input device 2.

[0022] The display unit 3 may be, for example, any of various displays that display images (for example, a liquid crystal display). The display unit 3 is supported by the housing 2 via a support 21. The display unit 3 faces diagonally upward and rearward toward the imaging unit 4, which will be described later.

[0023] Specifically, the display unit 3 is supported by the support part 21 in a state in which the front end of the display unit 3 is tilted at a predetermined angle θ1 in a direction approaching the imaging unit 4 (described later) with respect to an imaginary line α1 parallel to the horizontal direction. In the present embodiment, the predetermined angle θ1 is 45°.

[0024] The display unit 3 has a display surface 30 that emits light for an image, and a main body 31 that supports the display surface 30.

[0025] The light of the display image displayed on display surface 30 is focused as aerial image G1 on imaging surface S by imaging unit 4, which will be described later. Aerial image G1 is an example of a real image. Imaging surface S is a virtual region that exists in the air outside housing 2.

[0026] Of the light of the display image displayed by display surface 30, the light that is imaged as aerial image G1 on imaging surface S by imaging unit 4 is sometimes referred to as light to be imaged. The light of the display image displayed by display surface 30 also includes light other than the light that is imaged as aerial image G1 on imaging surface S by imaging unit 4 (hereinafter, sometimes referred to as light not to be imaged).

[0027] Imaging plane S may be considered to be a virtual area large enough to image at least aerial image G1. The area on imaging plane S where aerial image G1 is imaged is sometimes referred to as the aerial image area.

[0028] Furthermore, the imaging plane S is a virtual area that exists at a position that is plane-symmetrical to the display unit 3 with respect to the imaging unit 4 (in other words, the virtual line α2). The virtual line α2 is a virtual line that passes through the imaging unit 4 and is parallel to the horizontal direction. The virtual line α2 also passes through the imaging unit 4 and indicates a plane that is parallel to the imaging unit 4.

[0029] Specifically, the imaging surface S is a virtual area inclined at a predetermined angle θ2 with respect to a virtual line α3 parallel to the horizontal direction in a direction in which the front end of the imaging surface S approaches the imaging unit 4. In the present embodiment, the predetermined angle θ2 is 45°.

[0030] The display operation of the display unit 3 is controlled by the control unit 6, which will be described later. The control process of the display unit 3 by the control unit 6 will be described later.

[0031] As shown in FIG. 1 , imaging unit 4 is a plate-shaped member. Imaging unit 4 corresponds to an example of an optical plate. Imaging unit 4 is arranged parallel in the front-to-back and left-to-right directions. Imaging unit 4 forms the image displayed on display unit 3 as aerial image G1 in the aerial image area on imaging plane S.

[0032] The imaging unit 4 is composed of a lower plate 4a and an upper plate 4b stacked one on top of the other.

[0033] The lower plate 4a and the upper plate 4b have almost the same configuration. The configuration of the lower plate 4a will be described below. For the configuration of the upper plate 4b, the description of the lower plate 4a may be used as appropriate.

[0034] The lower plate 4 a has a main body portion 41 , a light reflecting portion 42 , and a filling member 45 .

[0035] The main body 41 is an example of an optical plate base material and is made of transparent resin. The main body 41 has a rectangular plate shape in the plan view shown in Fig. 3. Fig. 3 is a schematic plan view of the lower plate 4a.

[0036] The shape in plan view refers to the shape of the lower plate 4a when viewed from above. Also, Fig. 4 is a schematic cross-sectional view of the lower plate 4a taken along line C1-C1 in Fig. 3. For ease of explanation, hatching indicating a cross section has been omitted in Fig. 4.

[0037] The resin constituting the main body 41 is preferably any one of an ultraviolet curing resin, a thermosetting resin, a two-component curing resin, and a room temperature curing resin. Examples of the ultraviolet curing resin include (meth)acrylates such as urethane (meth)acrylate, (meth)acrylates having a polyisoprene skeleton, (meth)acrylates having a polybutadiene skeleton, and (meth)acrylate monomers.

[0038] Furthermore, the resin constituting the main body 41 may be a thermoplastic resin such as polymethyl methacrylate (PMMA: acrylic resin), amorphous fluororesin, cycloolefin polymer (COP), optical polycarbonate, fluorene polyester, and polyethersulfone.

[0039] The main body 41 has a plurality of ridges 43 and a plurality of grooves 44 .

[0040] The plurality of ridges 43 are provided on a first surface of the main body 41. Each of the plurality of ridges 43 extends in a first direction. In this embodiment, the first direction is the left-right direction. The plurality of ridges 43 are also aligned in a second direction.

[0041] The second direction is a direction perpendicular to the first direction in a horizontal plane. In this embodiment, the second direction is the front-to-rear direction. The first and second directions are determined according to the positional relationship between the imaging units 4. Therefore, the first direction is not limited to the left-to-right direction. Furthermore, the second direction is not limited to the front-to-rear direction.

[0042] In the main body 41, the surface that faces the first surface in the up-down direction is the second surface. The up-down direction may also be referred to as the third direction.

[0043] The first surface of the main body 41 of the lower plate 4a is the upper surface of the main body 41. The second surface of the main body 41 of the lower plate 4a is the lower surface of the main body 41.

[0044] The multiple ridges 43 have the same configuration. The configuration of one ridge 43 will be described below with reference to Figures 4 and 5. For the configurations of the other ridges 43, the description of the ridges 43 below may be used as appropriate. Figure 5 is a schematic cross-sectional view showing one ridge 43. Hatching indicating a cross section has been omitted in Figure 5.

[0045] The protrusion 43 has a vertical surface 431 , an inclined surface 432 , and a tip surface 433 .

[0046] The vertical surface 431 is provided on one side surface of the protrusion 43 in the second direction. In the present embodiment, the one side surface of the protrusion 43 in the second direction is a rear side surface of the protrusion 43. The one side surface of the protrusion 43 in the second direction corresponds to an example of a first side surface of the protrusion.

[0047] The vertical surfaces 431 are surfaces parallel to the vertical direction. The vertical surfaces 431 have a height dimension d (hereinafter also referred to as the height dimension d of the ribs 43). The vertical surfaces 431 of adjacent ribs 43 in the second direction are spaced apart by a distance p (hereinafter also referred to as the distance p of the ribs 43).

[0048] The distance p for the ribs 43 is the pitch in the second direction of the ribs 43. The height dimension d for the ribs 43 and the distance p for the ribs 43 satisfy d / p>5. It is preferable that the height dimension d for the ribs 43 and the distance p for the ribs 43 satisfy 10>d / p>5.

[0049] The height dimension d of the ribs 43 is, for example, 40 μm≦d≦500 μm, preferably 40 μm≦d≦250 μm, more preferably 40 μm≦d≦100 μm, and even more preferably 40 μm≦d≦50 μm. The distance p of the ribs 43 is, for example, 4 μm≦p≦100 μm, preferably 4 μm≦p≦50 μm, more preferably 4 μm≦p≦20 μm, and even more preferably 4 μm≦p≦10 μm.

[0050] Ridges 43 that satisfy the above-described relationship between height dimension d of ribs 43 and distance p of ribs 43 have a cross-sectional shape that is long in the vertical direction, as shown in Fig. 5. That is, ribs 43 have a relatively large aspect ratio, which is the ratio between height dimension d of ribs 43 and distance p of ribs 43. This configuration contributes to improving the resolution of aerial image G1.

[0051] The inclined surface 432 is provided on the other side surface of the protrusion 43 in the second direction. In the present embodiment, the other side surface of the protrusion 43 in the second direction is the front side surface of the protrusion 43. The other side surface of the protrusion 43 in the second direction corresponds to an example of the second side surface of the protrusion.

[0052] The inclined surface 432 is a surface inclined with respect to the vertical direction. The angle of inclination of the inclined surface 432 with respect to the vertical direction may be determined appropriately based on the relationship between the height dimension d of the rib projection 43 and the distance p of the rib projection 43. In this embodiment, the inclined surface 432 is a flat surface.

[0053] The tip surface 433 is provided at the tip of the ridge 43. In the case of the lower plate 4a, the tip of the ridge 43 also serves as the upper end of the ridge 43.

[0054] The tip surface 433 is a flat surface parallel to the horizontal direction. The tip surface 433 is a surface that connects the tip edge 431a of the vertical surface 431 and the tip edge 432a of the inclined surface 432 in the second direction (the front-rear direction in this embodiment).

[0055] The dimension w of the tip surface 433 in the second direction 433 (Hereinafter, the width dimension of the tip surface 433 w 433 It is sometimes called "w" 433 <5μm. Dimension w 433 can also be regarded as the width dimension of the tip of the protrusion 43 in the second direction.

[0056] In this manner, in this embodiment, the dimension w of the tip surface 433 433 Such a configuration contributes to improving the visibility and brightness of aerial image G1, the reasons for which will be described later.

[0057] In this embodiment, the base end edge of the inclined surface 432 of the protrusion 43 (also referred to as the first protrusion 43) is directly connected to the base end edge of the vertical surface 431 of the protrusion 43 (also referred to as the second protrusion 43) provided adjacent to the protrusion 43.

[0058] However, the base end edge of the inclined surface 432 of the first ridge 43 may be indirectly connected to the base end edge of the vertical surface 431 of the second ridge 43 via a flat surface (not shown).

[0059] The grooves 44 are provided between adjacent ridges 43 in the second direction. The cross section of the grooves 44 is a right triangle, as shown in Fig. 4. The grooves 44 extend in the first direction along the ridges 43.

[0060] Here, a method for manufacturing the above-mentioned main body 41 (that is, the optical plate base material) will be described.

[0061] A first example of a method for manufacturing an optical plate base material includes a process of molding a transparent thermoplastic resin by press molding, injection molding, or roll molding. A member made by such a process may be a plate-shaped member.

[0062] The thermoplastic resin used in the first example of the manufacturing method for the optical plate base material described above may be a thermoplastic resin such as polymethyl methacrylate (PMMA: acrylic resin), amorphous fluororesin, cycloolefin polymer (COP), optical polycarbonate, fluorene-based polyester, and polyethersulfone.

[0063] A second example of the method for manufacturing an optical plate base material includes a step of pouring at least one transparent curable resin selected from the group consisting of ultraviolet curable resin, thermosetting resin, two-component curable resin, and room temperature curable resin into a mold and curing the resin. The member produced by such a step may be a plate-shaped member.

[0064] The curable resin used in the second example of the method for manufacturing the optical plate base material described above may be any of the various resins listed as resins constituting the main body 41. In particular, the ultraviolet curable resin used in the second example of the method for manufacturing the optical plate base material may be, for example, a (meth)acrylate such as urethane (meth)acrylate, a (meth)acrylate having a polyisoprene skeleton, a (meth)acrylate having a polybutadiene skeleton, or a (meth)acrylate monomer.

[0065] A third example of the method for manufacturing an optical plate base material includes a step of molding a transparent resin using a 3D printer. The member produced by such a step may be a plate-shaped member.

[0066] The fourth example of the method for manufacturing the optical plate base material includes a step of forming a plurality of ridges (specifically, ridges 43) by cutting the first surface of a plate-shaped member made of transparent resin.

[0067] The transparent resin used in the third and fourth examples of the method for manufacturing the optical plate base material described above may be the same resin as the resin used in the first and second examples of the method for manufacturing the optical plate base material described above.

[0068] Furthermore, the process performed in the fourth example of the method for manufacturing the optical plate base material described above may be performed after the steps performed in the first, second, and third examples of the method for manufacturing the optical plate base material.

[0069] Furthermore, when carrying out the third example of the manufacturing method for the optical plate base material described above, a plurality of ridges (specifically, ridges 43) may be formed on the first surface of the plate-shaped member using a 3D printer.

[0070] 5, the light reflecting portion 42 is a metal film. In other words, the light reflecting portion 42 includes a metal layer. Examples of materials that form the light reflecting portion 42 include aluminum and silver.

[0071] The light reflecting portion 42 may be composed of one or more metal layers. When the light reflecting portion 42 is composed of multiple metal layers, the light reflecting portion 42 may include a metal layer composed of at least one of aluminum and silver.

[0072] The light reflecting portion 42 is provided on the vertical surface 431 of the main body portion 41. Such a light reflecting portion 42 is formed by a thin film formation method such as a metal vapor deposition method or a sputtering method. Note that the light reflecting portion 42 is omitted in Fig. 4. The thin film formation method for forming the light reflecting portion 42 may be any of various thin film formation methods.

[0073] Each of the plurality of filling members 45 is made of a transparent resin and fills the groove portion 44. Therefore, the cross section of the filling member 45 is a right triangle, as shown in Fig. 4. Each of the filling members 45 extends in the first direction so as to follow the groove portion 44.

[0074] The resin constituting the filling member 45 may be the same as the resin constituting the main body portion 41. However, the resin constituting the filling member 45 may be different from the resin constituting the main body portion 41. In this case, it is preferable that the difference between the refractive index of the filling member 45 and the refractive index of the main body portion 41 falls within a predetermined range.

[0075] As described above, in a state where the grooves 44 are filled with the filler 45, the first surface (that is, the upper surface) of the main body 41 (that is, the lower plate 4a) is a flat surface.

[0076] The upper plate 4b has a configuration substantially similar to that of the lower plate 4a described above. The lower plate 4a and the upper plate 4b having such a configuration are fixed together in a vertically overlapping state by a fixing means such as an adhesive.

[0077] Fig. 6 is a schematic cross-sectional view of the imaging unit 4, taken along a line corresponding to the C1-C1 line in Fig. 3. For ease of explanation, hatching indicating a cross section has been omitted in Fig. 6.

[0078] In this embodiment, the upper plate 4b is fixed to the lower plate 4a with the first surface on which the ribs 43 are formed facing downward, as shown in Fig. 6. In other words, the first surface of the upper plate 4b and the first surface of the lower plate 4a are fixed together.

[0079] In this embodiment, the upper plate 4b is fixed to the lower plate 4a in a state in which the protrusions 43 of the upper plate 4b are perpendicular to the upper plate 4b of the lower plate 4a in plan view.

[0080] Light of the display image on the display unit 3 is incident on the imaging unit 4 having the above-described configuration from the direction indicated by arrow A1 in Fig. 1. Hereinafter, the light of the display image incident on the imaging unit 4 may also be referred to as incident light related to the display image.

[0081] In this way, incident light related to the display image is reflected a specified number of times (for example, twice) at imaging unit 4, and is emitted from imaging unit 4 in the direction indicated by arrow A2 in Figure 1. Then, the emitted light related to the display image is focused on imaging surface S as aerial image G1.

[0082] In this way, of the light incident on the imaging unit 4, only the light that is reflected a specified number of times within the imaging unit 4 (in other words, the light to be imaged) is imaged by the imaging unit 4 on the imaging surface S as an aerial image G1.

[0083] On the other hand, light that is incident on imaging unit 4 and does not reflect the specified number of times within imaging unit 4 (in other words, light that is not to be imaged) is not imaged on imaging surface S by imaging unit 4 as aerial image G1.

[0084] The incident angle of the light to be imaged in the incident light relating to the display image is equal to the tilt angle θ1 with respect to the virtual line α1 of the display unit 3. In this embodiment, the incident angle of the incident light relating to the display image is 45°.

[0085] In addition, the angle of emergence of the light to be imaged in the emergent light for the displayed image is equal to the angle of incidence of the light to be imaged in the incident light for the displayed image. In this embodiment, the angle of emergence of the light to be imaged in the emergent light for the displayed image is 45°.

[0086] Input detection unit 5 (see FIG. 2) detects information (hereinafter referred to as operation input information) related to operation input to aerial image G1 from user U (see FIG. 1). As shown in FIG. 2, input detection unit 5 sends the detected operation input information to control unit 6. Such input detection unit 5 is supported by housing 2.

[0087] Input detection unit 5 is configured with a plurality of sensors (not shown). Input detection unit 5 detects, for example, information relating to a position in aerial image G1 operated by user U (also referred to as position information) as operation input information.

[0088] The position information may be, for example, information about coordinates in the aerial image G1 (also referred to as coordinate information). The coordinate information may be three-dimensional coordinates consisting of coordinates in the X direction, coordinates in the Y direction, and coordinates in the Z direction.

[0089] Input detection unit 5 may also detect information regarding the input depth of a fingertip when user U operates aerial image G1 (also referred to as input depth information). The input depth information may include the distance that user U's fingertip passes through aerial image G1 when user U operates aerial image G1. Input detection unit 5 sends the detected input depth information to control unit 6.

[0090] The above-mentioned operation input information, position information, coordinate information, and input depth information may be collectively referred to as first information.

[0091] The configuration of the input detection unit 5 is not particularly limited. The configuration of the input detection unit 5 may be various configurations that can realize the above-mentioned functions. Furthermore, the location where the input detection unit 5 is provided is also not particularly limited. The input detection unit 5 may be provided in various locations that can realize the above-mentioned functions.

[0092] 2, the control unit 6 controls the operation of the display unit 3. The control unit 6 is supported by the housing 2. The control unit 6 may actually be configured with a CPU, ROM, RAM, HDD, etc. connected via a bus, or may be configured with a one-chip LSI, etc. The control executed by the control unit 6 will be described below.

[0093] Controller 6 controls the display of the aerial image. That is, controller 6 controls the display operation of display unit 3. Specifically, controller 6 controls the display of the aerial image based on information related to an operation input by user U of non-contact input device 1 to aerial image G1.

[0094] Control unit 6 acquires information regarding operation input by user U of non-contact input device 1 to aerial image G1 from input detection unit 5. The information regarding operation input by user U of non-contact input device 1 to aerial image G1 is first information detected by input detection unit 5 (specifically, operation input information, position information, coordinate information, and input depth information).

[0095] (Operation, action and effect of non-contact input device) Below, the operation of the non-contact input device 1 will be briefly explained, and the functions and effects of the non-contact input device 1 according to this embodiment will be explained.

[0096] When the power of the non-contact input device 1 is turned on, the control unit 6 controls the display operation of the display unit 3. Then, a predetermined image is displayed on the display unit 3. Then, light of the image is emitted from the display unit 3 (specifically, the display surface 30).

[0097] Of the light of the image emitted from the display unit 3 (specifically, display surface 30), the light to be imaged enters the imaging unit 4 (specifically, lower plate 4a) from the direction indicated by arrow A1 in FIG.

[0098] The light to be imaged that is incident on the lower plate 4a is first reflected by the light reflecting portion 42 of the lower plate 4a. The light reflected by the light reflecting portion 42 of the lower plate 4a (i.e., the first reflected light) is incident on the upper plate 4b.

[0099] The first reflected light incident on upper plate 4b is reflected by light reflecting portion 42 of upper plate 4b and emitted from the upper surface (in other words, the second surface) of upper plate 4b (in other words, imaging unit 4). The light emitted from upper plate 4b (in other words, imaging unit 4) is imaged on imaging plane S as aerial image G1.

[0100] In this embodiment, the height d of the ridges 43 on the lower plate 4a and the upper plate 4b and the distance p of the ridges 43 on the lower plate 4a and the upper plate 4b satisfy d / p>5.

[0101] That is, in this embodiment, the so-called aspect ratio, which is the ratio of the height dimension d of ribs 43 to the distance p of ribs 43, is relatively large. Therefore, the pitch of ribs 43 in the second direction is small. As a result, the resolution of aerial image G1 formed on imaging surface S can be improved.

[0102] Incidentally, as shown in Fig. 7, when light reflecting portions 42 are formed on vertical surfaces 431 of ridges 43, metal films 46 may also be formed on tip surfaces 433 of ridges 43. Fig. 7 is a schematic diagram of ridges 43 of lower plate 4a. For ease of explanation, Fig. 7 shows the shape of ridges 43 in a way that makes it easy to understand the actions and effects obtained from this embodiment.

[0103] In the case of the lower plate 4a, the metal film 46 as described above may block light emitted from the lower plate 4a. Specifically, as shown in Fig. 7, the metal film 46 blocks light L4 out of the light L1 to L4 incident on the protrusions 43 of the lower plate 4a. In other words, the light L4 does not exit from the lower plate 4a.

[0104] This may result in a decrease in the amount of light that is imaged as aerial image G1 on imaging surface S. A decrease in the amount of light that is imaged as aerial image G1 on imaging surface S may result in aerial image G1 becoming dark.

[0105] Therefore, in this embodiment, the width dimension w of the tip surface 433 of the protrusion 43 433 But, w 433 That is, the width dimension w of the distal end surface 433 in the second direction (in the present embodiment, the front-rear direction) is set to be less than 5 μm. 433 But it's small.

[0106] Therefore, even when metal film 46 is formed on tip surface 433, the width dimension of metal film 46 is small. That is, the amount of light blocked by metal film 46 is small. This prevents a decrease in the amount of light focused as aerial image G1 on imaging plane S. As a result, aerial image G1 is prevented from becoming dark.

[0107] 7, metal film 46 reflects light L5 incident on imaging unit 4 from the outside (from above in this embodiment). Such reflected light may reduce the visibility of aerial image G1.

[0108] In this embodiment, as described above, the width dimension w of the metal film 46 433 Therefore, it is possible to reduce the amount of light reflected by metal film 46. As a result, it is possible to suppress a decrease in the visibility of aerial image G1.

[0109] Although not shown, the upper plate 4b also provides the same functions and effects as the lower plate 4a. [Industrial Applicability]

[0110] The present invention is applicable to aerial imaging devices used in a variety of applications. [Explanation of symbols]

[0111] 1. Non-contact input device 2. Case 21 Support part 3 Display section 30 Display surface 31 Main body 4 Imaging section 4a Lower plate 4b Upper plate 41 Main body 42 Light reflecting part 43 protrusion 431 Vertical plane 431a Tip edge 432 Slope 432a Tip edge 433 Tip surface 44 Groove 45 Filler material 46 Metal Film 5 Input detection section 6 Control Unit G1 Aerial Image U User S image plane

Claims

1. a plate body having a first surface with a plurality of ridges extending in a first direction and aligned in a second direction; Each of the plurality of protrusions has a vertical surface on a first side surface and an inclined surface on a second side surface, a height dimension d of the vertical surface and a distance p between the vertical surfaces of adjacent protrusions satisfy d / p>5; Optical plate base material.

2. The height dimension d and the distance p satisfy d / p<10. The optical plate base of claim 1 .

3. The width w of the tip of the protrusion satisfies w<5 μm. The optical plate base of claim 1 .

4. The height dimension d satisfies 40 μm≦d≦500 μm. The distance p satisfies 4 μm≦p≦100 μm. The optical plate base material according to claim 2 .

5. The optical plate base material according to any one of claims 1 to 4, a light reflecting portion provided on the vertical surface of the optical plate base material, The incident light is reflected by the light reflecting portion and emitted. Optical plate.

6. The light reflecting portion includes a metal layer. The optical plate according to claim 5 .

7. The metal layer includes a metal layer made of at least one of aluminum and silver. The optical plate according to claim 6 .

8. The optical plate according to claim 5, The incident light is focused as a real image on an image forming surface in the air. Aerial imaging device.

9. The method includes a step of molding a transparent thermoplastic resin by press molding, injection molding, or roll molding. A method for manufacturing an optical plate base material according to any one of claims 1 to 4.

10. The method includes a step of pouring at least one transparent curable resin selected from the group consisting of an ultraviolet curable resin, a thermosetting resin, a two-component curable resin, and a room temperature curable resin into a mold and curing the resin. A method for manufacturing an optical plate base material according to any one of claims 1 to 4.

11. This involves molding transparent resin using a 3D printer. A method for manufacturing an optical plate base material according to any one of claims 1 to 4.

12. a step of forming the plurality of protrusions by scraping a first surface of a plate-shaped member made of transparent resin, A method for manufacturing an optical plate base material according to any one of claims 1 to 4.

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