JP2017126032A - Optical sheet and optical panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an unintentional image from being observed.SOLUTION: Optical sheets 30, 40 are used for an optical panel 20 that changes a propagation direction of light L1 from an original image 91 incident to one side of the panel and transmits the light to the other side to form an image 92 on the other side. The optical sheets 30, 40 have a plurality of projections 35, 45, respectively, arranged in an arrangement direction da, db and extending in an extension direction intersecting the arrangement direction da, db. Each projection 35, 45 has a reflection surface 36, 46 to reflect the light L1 from the original image 91 and a counter surface 37, 47 opposing to the reflection surface 36, 46; and the counter surface 37, 47 comprises a rugged surface 39, 49.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an optical sheet used in an optical panel for changing the traveling direction of light from an original image incident from one side, transmitting to the other side, and displaying the image on the other side, and the optical The present invention relates to an optical panel including a sheet.

  For example, as disclosed in Patent Document 1, an optical panel for changing the traveling direction of light from an original image incident from one side, transmitting to the other side, and forming an image on the other side is provided. An imaging device provided is known. The optical panel of the imaging apparatus disclosed in Patent Document 1 includes a first optical sheet and a second optical sheet, and each optical sheet includes a plurality of light transmission portions arranged in the arrangement direction. The light transmission part has a reflection surface that reflects light from the original image incident from one side, and a slope that faces the reflection surface. According to the imaging device of Patent Document 1, the light from the original image incident from one side of the optical panel is reflected in two different directions parallel to the panel surface of the optical panel, so that the other side of the optical panel is reflected. The same virtual image as the original image that is a real image can be formed.

JP 2013-113902 A

  However, when the optical panel disclosed in Patent Document 1 is used, the light incident from one side of the optical panel is reflected by the inclined surface of the light transmission portion of each optical sheet, and thereby an unintended image is visually recognized. This can cause problems. For example, when light emitted from the original image and reflected by equipment or casing existing around the original image is incident on the optical panel and reflected by the inclined surface of the light transmission part of the optical sheet, the light reflected by the opposite surface is intended. It forms an image at a position where it does not, and can be visually recognized by a viewer as a so-called ghost. In particular, when an unintended image is observed from a direction in which an image to be originally formed can be observed, that is, when it is observed simultaneously with an image to be originally formed, the image to be originally formed Will significantly deteriorate the visibility.

  The present invention has been made in consideration of such points, and changes the traveling direction of light from the original image incident from one side to transmit to the other side and form an image on the other side. It is an object of the present invention to suppress an unintended image from being observed in an optical sheet for the purpose and an optical panel provided with the optical sheet.

The optical sheet of the present invention is
An optical sheet used in an optical panel for changing the traveling direction of light from an original image incident from one side and transmitting to the other side to form an image on the other side,
A plurality of convex portions arranged in an arrangement direction and extending in an extending direction intersecting with the arrangement direction, each convex portion reflecting a light reflecting the light from the original image and a facing surface facing the reflective surface; And having
The facing surface includes an uneven surface.

  In the optical sheet of the present invention, the uneven surface may include streak-like unevenness extending along a direction parallel to the extending direction.

  In the optical sheet of the present invention, the streaky irregularities may be regularly arranged on the facing surface in a direction intersecting with the extending direction.

  The optical sheet of the present invention may further include a base portion having a support surface that supports the plurality of convex portions, and a portion exposed from the convex portion of the support surface may include an uneven surface.

  In the optical sheet of the present invention, the uneven surface of the support surface may include streak unevenness extending along a direction parallel to the extending direction.

  In the optical sheet of the present invention, the streaky unevenness of the support surface may be regularly arranged in a direction intersecting the extending direction within the uneven surface of the support surface.

The optical panel of the present invention is
An optical panel for changing the traveling direction of light from an original image incident from one side, transmitting to the other side, and forming an image on the other side,
A plurality of first protrusions arranged in a first arrangement direction and extending in a first extending direction intersecting the first arrangement direction, each first protrusion from an original image incident from the one side; A first optical sheet having a first reflecting surface that reflects light and a first facing surface that faces the first reflecting surface;
An original image having a plurality of second convex portions arranged in a second arrangement direction and extending in a second extending direction intersecting the second arrangement direction, and each second convex portion is reflected by the first reflecting surface A second optical sheet having a second reflecting surface that reflects light from the second reflecting surface, and a second facing surface that faces the second reflecting surface,
At least one of the first facing surface and the second facing surface includes an uneven surface.

  According to the present invention, an optical sheet for changing the traveling direction of light from an original image incident from one side, transmitting to the other side, and forming an image on the other side, and the optical sheet In the provided optical panel, it is possible to suppress an unintended image from being observed.

FIG. 1 is a perspective view showing an image forming apparatus including an optical panel having an optical sheet for explaining an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the imaging apparatus of FIG. FIG. 3 is a partial perspective view showing an optical panel incorporated in the imaging apparatus of FIG. FIG. 4 is a diagram showing the optical sheet incorporated in the optical panel of FIG. 3 in a cross section along both the normal direction to the sheet surface and the arrangement direction of the convex portions. FIG. 5 is an enlarged cross-sectional view showing one of the convex portions and the base portion of FIG. FIG. 6 is a partial perspective view showing the convex portion and the base portion of FIG. FIG. 7 is a diagram showing a mold used for manufacturing an optical sheet in a cross section along both the normal direction to the plate surface and the arrangement direction of the convex portions. FIG. 8 is a cross-sectional view showing an enlarged recess of the mold shown in FIG. FIG. 9 is a view for explaining a method of manufacturing the mold of FIG. FIG. 10 is a diagram for explaining a method of manufacturing the mold of FIG. FIG. 11 is a cross-sectional view for explaining a method of manufacturing an optical sheet using the mold shown in FIG. FIG. 12 is a cross-sectional view showing an optical sheet according to a modification. 13 is a partial perspective view showing the optical sheet of FIG. FIG. 14 is a cross-sectional view showing an optical sheet according to another modification.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  FIGS. 1-14 is a figure for demonstrating one Embodiment by this invention. Among these, FIG.1 and FIG.2 is the perspective view and longitudinal cross-sectional view which show an imaging device. FIG. 3 is a partial perspective view showing an optical panel incorporated in the imaging apparatus. FIG. 4 is a cross-sectional view showing an optical sheet incorporated in the optical panel.

  As shown in FIGS. 1 and 2, the imaging apparatus 10 includes an optical panel 20 that changes the traveling direction of light from an original image (original image) 91 incident from one side and transmits the light to the other side. And a casing 15 that supports the optical panel 20. In the illustrated imaging apparatus 10, a conical solid model is arranged in the casing 15 as an original image 91. Therefore, in the illustrated example, the inside of the casing 15 is one side of the optical panel 20, that is, the light incident side, and the outside of the casing is the other side of the optical panel 20. The optical panel 20 reflects the light from the original image 91 in two different directions da and db parallel to the panel surface, so that it is the same as the original image that is a real image on the other side of the optical panel 20, that is, the light output side. A virtual image 92 is formed.

  The casing 15 is formed in a box shape, and supports the optical panel 20 on the upper surface 15a. The upper surface 15a of the casing 15 is inclined with respect to the bottom surface 15b by 45 °, for example. The object (cone) that becomes the original image 91 is disposed in the casing 15 at a position that does not face the normal direction nd to the panel surface of the optical panel 20. The virtual image 92 formed by the optical panel 20 is observed at a position not facing the normal direction nd to the panel surface of the optical panel 20. In particular, in the illustrated example, according to the configuration of the optical panel 20 described below, the virtual image 92 has a panel plane of the optical panel 20 as a center plane and is in a plane symmetric with respect to the original image 91. Will be observed.

  In the present specification, terms such as “panel”, “sheet”, “film”, “plate” and the like are not distinguished from each other only based on the difference in names. Therefore, for example, a “sheet” is a concept including a member that can also be called a film or a plate. As a specific example, the “optical sheet” includes a member called “optical film” or the like.

  Further, in this specification, “sheet surface (film surface, plate surface, panel surface)” is a general and global view of the target sheet-like (film shape, plate shape, panel shape) member. In this case, it refers to a surface that coincides with the planar direction of a sheet-like (film-like, plate-like, panel-like) member.

  Furthermore, terms used in the present specification for specifying shapes and geometric conditions, for example, terms such as “parallel”, “orthogonal”, “symmetric”, “trapezoid” and the like are not restricted to strict meanings. Therefore, it should be interpreted including an error to the extent that a similar optical function can be expected.

  Hereinafter, the configuration and operational effects of the optical panel 20 will be further described in detail. As shown in FIG. 3, the optical panel 20 includes a first optical sheet 30 and a second optical sheet 40 disposed on the other side of the first optical sheet 30, that is, the light output side. The first optical sheet 30 has a sheet-like first base portion 31 and first convex portions 35 arranged on the first base portion 31, and the second optical sheet 40 has a sheet-like shape. It has the 2nd base part 41 and the 2nd convex part 45 arranged on the 2nd base part 41. In the following, the optical sheets 30 and 40 will be described in more detail. In the following description, when the terms “first” and “second” are used and the symbols in the 30s and 40s are listed and described, For example, when the terms “optical sheets 30 and 40”, “base portions 31 and 41”, and “convex portions 35 and 45” are used for explanation, both the first optical sheet 30 and the second optical sheet 40 are used. This is a true explanation. In particular, in the illustrated embodiment, the first optical sheet 30 and the second optical sheet 40 are configured identically. 4 to 6 and FIGS. 10 to 13 are views showing both the first optical sheet 30 and the second optical sheet 40 that are configured identically.

  The base portions 31 and 41 are layers that support the convex portions 35 and 45, and are appropriately configured so as to have appropriate strength and appropriate transparency. The other surface (light-emitting side surface) of the first base portion 31 forms a first support surface 31a, and the first convex portion 35 is supported on the first support surface 31a. Further, the other side surface (light-emitting side surface) of the second base portion 41 forms a second support surface 41a, and the second convex portion 45 is supported on the second support surface 41a. As an example, the thickness of the base portions 31 and 41 can be set to 20 μm or more and 200 μm or less. As such base portions 31 and 41, for example, a biaxially stretched polyethylene terephthalate (PET) film can be used. The biaxially stretched polyethylene terephthalate film is suitable for application as the base portions 31 and 41 in that it has appropriate transparency and durability against ultraviolet irradiation treatment, heat treatment, and the like.

  As shown in FIGS. 3 and 4, the first protrusions 35 are arranged on the first support surface 31 a of the first base portion 31 along the first arrangement direction da parallel to the first support surface 31 a. Has been. The second convex portions 45 are arranged on the second support surface 41a of the second base portion 41 along a second arrangement direction db parallel to the second support surface 41a. The convex portions 35 and 45 extend linearly in a direction intersecting with the arrangement directions da and db and parallel to the support surfaces 31a and 41a of the base portions 31 and 41. In particular, in the illustrated example, the convex portions 35 and 45 extend linearly in a direction orthogonal to the arrangement directions da and db. In the present embodiment, the direction in which the convex portions 35 and 45 extend is referred to as the extending direction. The convex portions 35 and 45 may be arranged without gaps on the support surfaces 31a and 41a of the base portions 31 and 41 as shown in FIG. 3, or the gaps in the arrangement directions da and db as shown in FIG. In other words, the support surfaces 31a and 41a have portions exposed from the convex portions 35 and 45 between the two convex portions 35 and 45 adjacent to each other in the arrangement direction da and db. It may be arranged on the support surfaces 31a and 41a.

  Each first convex portion 35 of the first optical sheet 30 has a top surface 35a that forms the surface on the other side of the first convex portion 35 and a first reflective surface that reflects light from the original image 91 incident from one side. 36 and a first facing surface 37 facing the first reflecting surface 36. In particular, the first reflecting surface 36 is disposed on one side along the first arrangement direction da of the first protrusions 35, and the first facing surface 37 is along the first arrangement direction da of the first protrusions 35. Arranged on the other side. Each 2nd convex part 45 of the 2nd optical sheet 40 is the 2nd reflective surface which reflects the light from the upper surface 45a which makes the surface of the other side of the 2nd convex part 45, and the original image 91 which injects from one side. 46 and a second facing surface 47 facing the second reflecting surface 46. In particular, the second reflecting surface 46 is disposed on one side along the second arrangement direction db of the second convex portions 45, and the second facing surface 47 is along the second arrangement direction db of the second convex portions 45. Arranged on the other side. Between the first convex portions 35 included in the first optical sheet 30, the first reflecting surfaces 36 are parallel to each other. Further, the second reflecting surfaces 46 are parallel to each other between the multiple second convex portions 45 included in the second optical sheet 40.

  As shown in FIG. 3, the first optical sheet 30 and the second optical sheet are arranged so that the arrangement direction da of the first convex portions 35 and the arrangement direction db of the second convex portions 45 intersect with each other. They are placed on top of each other. In particular, in the present embodiment, the first optical sheet 30 and the second optical sheet are positioned with respect to each other such that the arrangement direction da of the first convex portions 35 and the arrangement direction db of the second convex portions 45 are orthogonal to each other. Has been.

  The first optical sheet 30 has a first concave portion 38 between two adjacent first convex portions 35, and the second optical sheet 40 has a second concave portion 48 between two adjacent second convex portions 45. have. As shown in FIGS. 3 and 4, the concave portions 38 and 48 are arranged on the base portions 31 and 41 adjacent to the convex portions 35 and 45 and alternately arranged with the convex portions 35 and 45 in the arrangement directions da and db. ing. Further, the recesses 38 and 48 extend linearly in a direction intersecting with the arrangement directions da and db and parallel to the support surfaces 31a and 41a of the base portions 31 and 41. In particular, the concave portions 38 and 48 extend in a direction parallel to the extending direction of the convex portions 35 and 45. That is, the concave portions 38 and 48 are arranged on the support surfaces 31 a and 41 a of the base portions 31 and 41 in a stripe arrangement like the convex portions 35 and 45.

  The concave portions 38 and 48 are the reflective surfaces 36 and 46 of one convex portion 35 and 45, and the opposing surfaces 37 of the other convex portions 35 and 45 adjacent to the reflective surfaces 36 and 46 of the convex portions 35 and 45, respectively. 47. In particular, in the example shown in FIG. 4, the recesses 38, 48 are the reflection surfaces 36, 46 of one projection 35, 45 and the other adjacent to the reflection surface 36, 46 side of the projection 35, 45. The opposing surfaces 37 and 47 of the convex portions 35 and 45 are side surfaces, and the support surfaces 31a and 41a of the base portions 31 and 41 located between the reflecting surfaces 36 and 46 and the opposing surfaces 37 and 47 are bottom surfaces. ,It is formed.

  Next, the cross-sectional shape of the convex portions 35 and 45 will be described with reference to FIGS. FIG. 4 shows the optical sheet in a cross section (also referred to as a main cutting surface of the optical sheet) along the arrangement directions da and db of the convex portions 35 and 45 of the optical sheets 30 and 40 and the normal direction nd of the optical sheets 30 and 40. FIG. 5 is an enlarged view of one of the convex portions 35 and 45 and the base portions 31 and 41, and FIG. 6 is a perspective view of the convex portions 35 and 45 and the base of FIG. It is a fragmentary perspective view which shows the parts 31 and 41. FIG.

  As shown in FIGS. 4 to 6, in the main cut surface of the first optical sheet 30, the width W <b> 1 of the first convex portion 35 along the first arrangement direction da is at the end portion on the other side (light emission side). The width W2 of the second convex portion 45 along the second arrangement direction db on the main cutting surface of the second optical sheet 40 is narrower than the end on one side (light incident side). Is narrower than the end on one side. That is, the width W1b of the first convex portion 35 at the light output side end is narrower than the width W1a of the first convex portion 35 at the light incident side end, and the width of the second convex 45 at the light output side end. W2b is narrower than the width W2a of the second convex portion 45 at the light incident side end.

  In particular, in the example shown in FIGS. 4 to 6, the width W1 of the first convex portion 35 along the first arrangement direction da is from one side (light incident side) to the other side (light emitting side). It changes only to become narrower and does not change to become wider. Similarly, the width W2 of the second convex portion 45 along the second arrangement direction db changes and widens only so as to become narrower from one side (light incident side) to the other side (light emitting side). Will not change. 4 to 6, the width W1 of the first convex portion 35 along the first arrangement direction da is from one side (light incident side) to the other side (light output side). The width W2 of the second convex portion 45 along the second arrangement direction db changes so as to become narrower from one side (light incident side) to the other side (light outgoing side). I keep doing it.

  Furthermore, as shown in FIGS. 4 to 6, the first convex portion 35 has a substantially trapezoidal shape on the main cut surface of the first optical sheet 30, and the second convex portion 45 has the second optical sheet 40. The main cut surface is substantially trapezoidal. In the present embodiment, the main cut surface of the first optical sheet 30 is separated from the original image 91 by one of the two surfaces 36 and 37 extending from one side of the first convex portion 35 to the other side. A first reflecting surface 36 that reflects the light of the first reflecting surface 36 is formed, and the other of the two surfaces 36 and 37 forms a first facing surface 37 that faces the first reflecting surface 36. Similarly, light from the original image 91 is reflected by one of the two surfaces 46 and 47 extending from one side of the second convex portion 45 to the other side of the main cut surface of the second optical sheet 40. The second reflecting surface 46 is configured, and the other of the two surfaces 46 and 47 forms a second facing surface 47 that faces the second reflecting surface 46.

  In the example shown in FIGS. 4 to 6, one side corresponding to the trapezoidal first reflecting surface 36 formed by the first protrusion 35 is orthogonal to the upper and lower bases of the trapezoidal shape. One side corresponding to the trapezoidal second reflecting surface 46 formed by the second convex portion 45 is orthogonal to the upper and lower bases of the trapezoidal shape. That is, the first reflective surface 36 of the first convex portion 35 extends in parallel with the normal direction nd of the first optical sheet 30, and the second reflective surface 46 of the second convex portion 45 is the second optical surface. The sheet 40 extends in parallel with the normal direction nd of the sheet 40. In the illustrated example, the trapezoidal shape forming the cross-sectional shape of the convex portions 35 and 45 is arranged such that the upper base forms the surface of the other side of the optical sheets 30 and 40 and the lower base is arranged on one side. ing. The reflecting surfaces 36 and 46 are not limited to those parallel to the normal direction nd of the optical sheets 30 and 40. If the light from the original image 91 incident from one side (light incident side) can be reflected and a virtual image 92 can be formed on the other side (light output side), the reflecting surfaces 36 and 46 are The optical sheets 30 and 40 may be inclined with respect to the normal direction nd. As an example, the reflective surfaces 36 and 46 may be inclined at an angle of 0.05 ° or more and 1 ° or less with respect to the normal direction nd of the optical sheets 30 and 40.

  At least one of the first opposing surface 37 of the first convex portion 35 and the second opposing surface 47 of the second convex portion 45 includes an uneven surface. In particular, in the example shown in FIGS. 5 and 6, the first opposing surface 37 of the first convex portion 35 includes the first uneven surface 39, and the second opposing surface 47 of the second convex portion 45 is the second uneven surface 49. Is included. In the illustrated example, the uneven surfaces 39 and 49 include a plurality of streaky unevenness. In the present specification, “striated” refers to an elongated linear or belt-like shape. Therefore, the “striated unevenness” includes an elongated linear or belt-shaped convex portion, an elongated linear or belt-shaped concave portion, and a combination thereof. Note that the “striated shape” is not limited to a linear shape, and includes a shape that has a shape other than a linear shape, such as a wavy shape or a broken line shape, and that is elongated as a whole. In the illustrated example, the plurality of streaky irregularities are arranged on the opposing surfaces 37 and 47 of the convex portions 35 and 45 and extend linearly in a direction intersecting the arrangement direction. In particular, the plurality of streaky irregularities extend along a direction parallel to the extending direction of the convex portions 35 and 45. Further, the plurality of streaky irregularities are arranged without gaps on the opposing surfaces 37 and 47 of the convex portions 35 and 45 along the direction orthogonal to the extending direction of the convex portions 35 and 45. Therefore, the opposing surfaces 37 and 47 of the convex portions 35 and 45 are formed by a plurality of streaky irregularities arranged without gaps along a direction orthogonal to the extending direction of the convex portions 35 and 45. In the illustrated example, the plurality of streaky irregularities are regularly arranged on the opposing surfaces 37 and 47 along the direction intersecting the extending direction of the convex portions 35 and 45. Therefore, the opposing surfaces 37 and 47 of the convex portions 35 and 45 are formed by a plurality of streaky irregularities regularly arranged along a direction orthogonal to the extending direction of the convex portions 35 and 45. The plurality of streaky irregularities is not limited to those regularly arranged, and may be irregularly arranged. In particular, the plurality of streaky irregularities may be irregularly arranged on the opposing surfaces 37 and 47 along the direction intersecting the extending direction of the convex portions 35 and 45. The average arrangement pitch of the plurality of streaky irregularities arranged regularly or irregularly can be, for example, 0.1 μm or more and 10 μm or less. 3 and 4, the specific shapes of the concave and convex surfaces 39 and 49 included in the opposing surfaces 37 and 47 of the convex portions 35 and 45 are not shown.

  The concave and convex surfaces 39 and 49 included in the opposing surfaces 37 and 47 of the convex portions 35 and 45 have a function of diffusing light incident on the opposing surfaces 37 and 47 as will be described later. It is not limited to those consisting of streaky irregularities. For example, the uneven surfaces 39 and 49 may be uneven surfaces 39 and 49 having other shapes such as a roughened surface (mat surface). In addition, the uneven surfaces 39 and 49 included in the opposing surfaces 37 and 47 of the convex portions 35 and 45 are not limited to those arranged on the entire opposing surfaces 37 and 47, and the uneven surfaces 39 and 49 are the same as the opposing surfaces 37 and 47. It may be arranged in part.

  Next, a method for manufacturing the optical sheets 30 and 40 having the above configuration will be described.

  First, the metal mold | die 70 for shaping the convex parts 35 and 45 of the optical sheets 30 and 40 is demonstrated with reference to FIG.7 and FIG.8. FIG. 7 is a view showing the mold 70 in a cross section (also referred to as a main cutting surface of the mold) along the arrangement direction dc of the convex portions 75 of the mold 70 and the normal direction nd of the mold 70. FIG. 8 is an enlarged cross-sectional view showing one recess 78 of the mold shown in FIG.

  In the example shown in FIG. 7, the mold 70 has a sheet-like base portion 71 and convex portions 75 arranged on the base portion 71. The base portion 71 is a layer that supports the convex portion 75 and is appropriately configured to have an appropriate strength. The surface of the base portion 71 on the convex portion 75 side forms a support surface 71a, and the convex portion 75 is supported on the support surface 71a.

  As shown in FIG. 7, the convex portions 75 are arranged on the support surface 71 a of the base portion 71 along the arrangement direction dc parallel to the support surface 71 a. The convex portion 75 extends linearly in a direction intersecting with the arrangement direction dc and parallel to the support surface 71 a of the base portion 71. In particular, in the illustrated example, the convex portion 75 extends linearly in a direction orthogonal to the arrangement direction dc. In the illustrated example, the protrusion 75 has a gap in the arrangement direction dc, that is, the support surface 71a has a portion exposed from the protrusion 75 between the two protrusions 75 adjacent to each other in the arrangement direction dc. And arranged on the support surface 71 a of the base 71.

  Each convex portion 75 of the mold 70 has an upper surface 75 a that forms a surface opposite to the base portion 71, a side surface 76, and a facing surface 77 that faces the side surface 76. In particular, the side surface 76 is arranged on one side along the arrangement direction dc of the convex portions 75, and the facing surface 77 is arranged on the other side along the arrangement direction dc of the convex portions 75. The side surfaces 76 are parallel to each other between the large number of convex portions 75 included in the mold 70.

  The mold 70 has a recess 78 between two adjacent protrusions 75. As shown in FIG. 7, the recesses 78 are arranged on the base portion 71 adjacent to the projections 75 and alternately with the projections 75 in the arrangement direction dc. Further, the recess 78 extends linearly in a direction intersecting with the arrangement direction dc and in a direction parallel to the support surface 71 a of the base portion 71. In particular, the concave portion 78 extends in a direction parallel to the extending direction of the convex portion 75. That is, the concave portions 78 are arranged on the support surface 71 a of the base portion 71 in a stripe arrangement like the convex portions 75.

  The concave portion 78 includes a side surface 76 of one convex portion 75 and an opposing surface 77 of another convex portion 75 adjacent to the side surface 76 of the convex portion 75. In particular, in the example shown in FIG. 7, the concave portion 78 has the side surface 76 of one convex portion 75 and the opposing surface 77 of another convex portion 75 adjacent to the side surface 76 of the convex portion 75 as side surfaces. The support surface 71a of the base portion 71 located between the side surface 76 and the facing surface 77 is used as a bottom surface.

  As shown in FIG. 7, in the main cutting surface of the mold 70, the width W3 of the convex portion 75 along the arrangement direction dc is narrower at the end portion on the upper surface 75a side than the end portion on the base portion 71 side. . That is, the width W3b of the convex portion 75 at the light exit side end is narrower than the width W3a of the convex portion 75 at the light incident side end. In particular, in the illustrated example, the width W3 of the convex portion 75 along the arrangement direction dc changes only so as to decrease from the base portion 71 side toward the upper surface 75a side, and does not change so as to increase. . Further, in the illustrated example, the width W3 of the convex portion 75 along the arrangement direction dc continues to change so as to become narrower from the base portion 71 side toward the upper surface 75a side.

  Furthermore, as shown in FIG. 7, the convex portion 75 has a substantially trapezoidal shape on the main cutting surface of the mold 70. In the present embodiment, in the main cutting surface of the mold 70, the side surface 76 is constituted by one of the two surfaces 76 and 77 extending from the base portion 71 side to the upper surface 75 a side of the convex portion 75. The other of the two surfaces 76 and 77 constitutes an opposing surface 77 that faces the side surface 76.

  In the example shown in FIG. 7, one side corresponding to the trapezoidal side surface 76 formed by the convex portion 75 is orthogonal to the upper and lower bases of the trapezoidal shape. That is, the side surface 76 of the convex portion 75 extends in parallel with the normal direction nd of the mold 70. In the illustrated example, the trapezoidal shape forming the cross-sectional shape of the convex portion 75 is arranged such that the upper base forms the upper surface 75a of the optical sheet, and the lower base is arranged on the base portion 71 side. Note that the side surface 76 is not limited to one parallel to the normal direction nd of the mold 70. That is, the side surface 76 may be inclined with respect to the normal direction nd of the mold 70. As an example, the side surface 76 may be inclined at an angle of 0.05 ° or more and 1 ° or less with respect to the normal direction nd of the mold 70.

  The opposing surface 77 of the convex portion 75 includes an uneven surface 79. In the example shown in FIG. 8, the uneven surface 79 includes a plurality of streaky unevenness. The plurality of streaky irregularities are arranged on the facing surface 77 of the convex portion 75 and extend linearly in a direction intersecting the arrangement direction. In particular, the plurality of streaky irregularities extend along a direction parallel to the extending direction of the convex portions 75. Further, the plurality of streaky irregularities are arranged on the facing surface 77 of the convex portion 75 along the direction orthogonal to the extending direction of the convex portion 75 without a gap. Therefore, the opposing surface 77 of the convex portion 75 is formed by a plurality of streaky irregularities arranged without gaps along a direction orthogonal to the extending direction of the convex portion 75. In the illustrated example, the plurality of streaky irregularities are regularly arranged on the facing surface 77 along the direction intersecting the extending direction of the convex portions 75. Therefore, the opposing surface 77 of the convex portion 75 is formed by a plurality of streaky irregularities regularly arranged along a direction orthogonal to the extending direction of the convex portion 75. 7 and 11, the specific shape of the uneven surface 79 included in the facing surface 77 of the protrusion 75 is not shown.

  In addition, the uneven surface 79 included in the facing surface 77 of the convex portion 75 is not limited to one having a plurality of streaky unevenness. For example, the uneven surface 79 may be an uneven surface 79 having another shape such as a roughened surface (mat surface). Further, the uneven surface 79 included in the facing surface 77 of the convex portion 75 is not limited to the one disposed on the entire facing surface 77, and the uneven surface 79 may be disposed on a part of the facing surface 77.

  Although the material of such a metal mold | die 70 is not specifically limited, For example, metal materials, such as copper alloys, such as nickel, nickel- phosphorus alloy, copper, and brass, aluminum, and aluminum alloy, etc. can be used.

  The mold 70 having the above-described configuration can be manufactured as follows as an example.

  First, the base material 70a is prepared. The base material 70a has a first surface 70a1 and a second surface 70a2 facing the first surface 70a1. Although it does not restrict | limit especially as the base material 70a, For example, metal materials, such as nickel, nickel- phosphorus alloy, copper alloys, such as copper and brass, aluminum, and aluminum alloys, etc. can be used.

  Next, as shown in FIG. 9, a groove 781 is formed on the first surface 70 a 1 side of the base material 70 a using the cutting tool 80. In the illustrated example, the cutting tool 80 has a bottom surface 81, a first side surface 82, and a second side surface 83 facing the first side surface 82 that function as a blade for cutting the base material 70 a. In the illustrated example, the cutting tool 80 has a bottom surface 81 parallel to the plate surface of the base material 70a, a first side surface 82 inclined with respect to the normal direction nd to the plate surface of the base material 70a, and The two side surfaces 83 are arranged so as to be parallel to the normal direction nd to the plate surface of the base material 70a. It should be noted that the second side surface 83 of the cutting tool 80 is not limited to the one arranged so as to be parallel to the normal direction nd of the base material 70a. That is, the second side surface 83 may be disposed to be inclined with respect to the normal direction nd of the base material 70a. As an example, the second side surface 83 of the cutting tool 80 may be inclined at an angle of 0.05 ° to 1 ° with respect to the normal direction nd of the base material 70a.

  The groove 781 is formed by cutting the base material 70a with the cutting tool 80 from the first surface 70a1 side. Specifically, the base material 70a is cut from the first surface 70a1 side while the cutting tool 80 is moved along a direction parallel to the first surface 70a1 of the base material 70a (direction perpendicular to the paper surface in FIG. 9). At this time, cutting is performed so that the depth of the bottom surface 81 of the cutting tool 80 from the first surface 70a1 of the base material 70a becomes a predetermined depth ΔD. Thereby, a groove 781 having a depth ΔD is formed on the first surface 70a1 side of the base material 70a. The groove 781 extends linearly along a direction parallel to the first surface 70a1 of the base material 70a. In particular, in the illustrated example, the groove 781 extends linearly along a direction parallel to the first surface 70a1 of the base material 70a.

  Next, as shown in FIG. 10, a groove 782 is formed by cutting the base material 70a from the first surface 70a1 side with a cutting tool 80. Specifically, the cutting tool 80 is extended from the groove 781 by a predetermined distance ΔS in a direction intersecting with the extending direction of the groove 781 (extending direction), particularly in a direction orthogonal thereto. The base material 70a is cut from the first surface 70a1 side while being moved along a direction parallel to the current direction (a direction perpendicular to the paper surface in FIG. 10). At this time, the cutting is performed so that the depth of the bottom surface 81 of the cutting tool 80 from the bottom surface of the groove 781 becomes ΔD. Thus, a groove 782 having a depth ΔD from the bottom surface of the groove 781 is formed on the first surface 70a1 side of the base material 70a. The groove 782 extends linearly along a direction parallel to the extending direction of the groove 781. In particular, in the illustrated example, the groove 781 extends linearly along a direction parallel to the extending direction of the groove 781.

  Similarly, the groove 783 is formed by cutting the base material 70a with the cutting tool 80 from the first surface 70a1 side. Specifically, the cutting tool 80 is extended from the groove 782 by a predetermined distance ΔS in a direction intersecting with the extending direction of the grooves 781 and 782, particularly in a direction orthogonal to the extending direction of the grooves 781 and 782. The base material 70a is cut from the first surface 70a1 side while being moved along a direction parallel to the existing direction. At this time, the cutting is performed so that the depth of the bottom surface 81 of the cutting tool 80 from the bottom surface of the groove 782 becomes ΔD. Thus, a groove 783 having a depth ΔD from the bottom surface of the groove 782 is formed on the first surface 70a1 side of the substrate 70a.

  By repeating this process, the mold 70 as shown in FIG. 8 can be produced from the base material 70a. In the illustrated example, the recess 78 of the mold 70 is formed from the above-described grooves 781, 782, 783,.

  Next, as shown in FIG. 11, an uncured and flowable convex component composition 85 that forms the convex portions 35 and 45 of the optical sheets 30 and 40 by curing. The base film 86 that fills the concave portions 78 of the mold 70 and that forms the base portions 31 and 41 of the optical sheets 30 and 40 is laminated on the opposite side of the convex portion constituting composition 85 from the mold 70. As the convex component composition 85, for example, a resin such as an epoxy acrylate prepolymer that is cured by irradiation with ionizing radiation such as an electron beam or ultraviolet rays can be used. As the base film 86, for example, a biaxially stretched polyethylene terephthalate (PET) film can be used. Thus, after filling the convex component composition 85 between the base film 86 and the mold 70, in particular, between the base film 86 and the concave portion 78 of the mold 70, the ionizing radiation is irradiated, The convex component composition 85 is cured (solidified).

  Thereafter, the cured convex component composition 85 is released from the mold 70 together with the base film 86, whereby the optical sheets 30 and 40 having the convex portions 35 and 45 as shown in FIGS. Manufactured. At this time, the base film 86 forms the base portions 31 and 41 of the optical sheets 30 and 40, and the cured convex component composition 85 forms the convex portions 35 and 45 of the optical sheets 30 and 40.

  In addition, when the side surface 76 of the convex portion 75 of the mold 70 is parallel to the normal direction nd of the mold 70, the convex portion 75 is removed when the convex component composition 85 is released from the mold 70. Side surface 76 of the convex portion constituent composition 85 rubs against the surfaces that will later form the reflective surfaces 36 and 46 of the convex portions 35 and 45 of the optical sheets 30 and 40, thereby causing scratches on the reflective surfaces 36 and 46. There is. Therefore, the side surface 76 of the convex portion 75 of the mold 70 is inclined so as to approach the opposing surface 77 of the convex portion 75 from the base portion 71 toward the upper surface 75a, that is, the side surface 76 of the convex portion 75 is tapered. When releasing the convex component composition 85 from the mold 70, the side surface 76 of the convex component 75 does not rub against the surface of the convex component composition 85 that will later form the reflective surfaces 36 and 46. It is preferable to do so. As an example, the side surface 76 of the convex portion 75 of the mold 70 is set to 0. 0 with respect to the normal direction nd of the mold 70 so as to approach the opposing surface 77 of the convex portion 75 from the base portion 71 toward the upper surface 75a. It is preferable to incline at an angle between 05 ° and 1 °.

  The convex portions 35 and 45 of the optical sheets 30 and 40 manufactured as described above have a complementary shape with the concave portion 78 of the mold 70. Specifically, on the main cutting surfaces of the optical sheets 30 and 40 and the mold 70, the upper surfaces 35 a and 45 a of the convex portions 35 and 45 of the optical sheets 30 and 40 have a complementary shape with the bottom surface of the concave portion 78 of the mold 70. Eggplant. The reflecting surfaces 36 and 46 of the convex portions 35 and 45 of the optical sheets 30 and 40 are complementary to one side surface of the concave portion 78 of the mold 70, that is, the side surface 76 of one convex portion 75. Further, the opposing surfaces 37 and 47 of the convex portions 35 and 45 of the optical sheets 30 and 40 are other convex portions adjacent to the other side surface of the concave portion 78 of the mold 70, that is, the side surface 76 side of the one convex portion 75. Complementary shape with 75 opposing surfaces 77. Therefore, the uneven surfaces 39 and 49 included in the opposing surfaces 37 and 47 of the convex portions 35 and 45 of the optical sheets 30 and 40 have a complementary shape with the uneven surface 79 included in the opposing surface 77 of the convex portion 75 of the mold 70. Eggplant. Thereby, the convex parts 35 and 45 which have the opposing surfaces 37 and 47 containing the uneven surfaces 39 and 49 can be formed.

  Next, functions and effects of the imaging apparatus 10, the optical panel 20, and the optical sheets 30 and 40 configured as described above will be described.

  As shown in FIGS. 1 and 2, an original image to be displayed, that is, an original image 91 is disposed on one side (light incident side) of the optical panel 20 supported by the casing 15. In the example shown in FIGS. 1 and 2, the cone is disposed in the casing 15 as the original image 91. As shown in FIG. 3, light from the original image 91 enters the optical panel 20 from one side, changes the traveling direction, passes through the optical panel 20, and forms an image 92 on the other side. Become.

  Light from the original image 91 enters the first optical sheet 30 disposed on one side of the optical panel 20. The first optical sheet 30 has a large number of first convex portions 35 arranged in the first arrangement direction da, and each first convex portion 35 has a first reflecting surface 36 parallel to each other. In the example shown in FIGS. 3 to 6, each first reflecting surface 36 has a normal direction nd to the sheet surface of the first optical sheet 30, in other words, a normal direction nd to the panel surface of the optical panel 20. It is a parallel surface. The first reflection surface 36 of the first optical sheet 30 reflects light from the original image 91 so as to form an image that is specularly reflected by a surface parallel to the first reflection surface 36.

  A second optical sheet 40 is disposed on the other side of the first optical sheet 30. The second optical sheet 40 has a large number of second convex portions 46 arranged in the second arrangement direction db, and each second convex portion 46 has a second reflecting surface 46 parallel to each other. In the example shown in FIGS. 3 to 6, each second reflecting surface 46 has a normal direction nd to the sheet surface of the second optical sheet 40, in other words, a normal direction nd to the panel surface of the optical panel 20. It is a parallel surface. From the original image 91 after being reflected by the first reflecting surface 36, the second reflecting surface 46 of the second optical sheet 40 forms a virtual image 92 that is specularly reflected by a surface parallel to the second reflecting surface 46. Reflects the light.

  As shown in FIG. 3, light traveling in various directions from each position of the original image 91 is transmitted from the first reflecting surface 36 in the first optical sheet 30 and the second reflecting surface 46 in the second optical sheet 40. The reflected light travels to a position symmetrical with respect to the position 91 of the original image with the panel surface of the optical panel 20 as the center. As a result, an image 92 that is plane-symmetric with the original image 91 about the panel surface of the optical panel 20 is formed (imaged) at a position that is plane-symmetric with the original image 91 about the panel surface of the optical panel 20. When the observer 1 observes from the direction opposite to the traveling direction of the light traveling from the optical panel 20 toward the position symmetrical to the original image 91 around the panel surface of the optical panel 20, the other side of the optical panel 20 is observed. The elephant 92 formed on the side can be grasped three-dimensionally.

  3 to 6, the reflection surfaces 36 and 46 of the optical panel 20 (the optical sheets 30 and 40) are in the normal direction nd to the panel surface of the optical panel 20 (the optical sheets 30 and 40). When the optical panel 20 and the original image 91 are arranged on the extended line in the observation direction when observing the virtual image 92 formed on the other side, the virtual image 92 is More specifically, the original image 91 itself is visually recognized through the optical panel 20 and between the reflecting surfaces 36 and 46, and the visibility of the virtual image 92 is significantly deteriorated. Therefore, in the example illustrated in FIGS. 1 and 2, the original image 91 is disposed at a position that does not face the optical panel 20 along the normal direction nd to the panel surface of the optical panel 20. Thereby, the observer 1 observes the reproduced virtual image 92 from a direction inclined to one side with respect to the normal direction nd to the panel surface of the optical panel 20. As a result, the original image 91 itself is prevented from being observed through the optical panel together with the virtual image 92.

  Next, with reference to FIG. 4, the effect of the optical sheets 30 and 40 of this Embodiment is further explained in full detail.

  The light L1 from the original image 91 incident on the optical sheets 30 and 40 from one side (light incident side) is reflected by the reflecting surfaces 36 and 46 of the convex portions 35 and 45 of the optical sheets 30 and 40, and particularly the convex portions. Due to the difference in refractive index between 35 and 45 and the recesses 38 and 48, the light is totally reflected by the reflecting surfaces 36 and 46, and is emitted to the other side (light emission side).

  At this time, in the conventional image forming apparatus, the light incident from one side of the optical panel is reflected by the facing surface of the light transmission portion of each optical sheet, thereby causing a problem that an unintended image is visually recognized. obtain. For example, when light emitted from the original image and reflected by equipment or casing existing around the original image is incident on the optical panel and reflected by the opposing surface of the convex portion of the optical sheet, the light reflected by this opposing surface is intended It forms an image at a position where it does not, and can be viewed by the observer as a so-called ghost. In particular, when an unintended image is observed from a direction in which an image to be originally formed can be observed, that is, when it is observed simultaneously with an image to be originally formed, the image to be originally formed Will significantly deteriorate the visibility.

  The optical sheets 30 and 40 of the present invention change the traveling direction of the light L1 from the original image 91 incident from one side and transmit the light L1 to the other side, and form an image 92 on the other side. The optical sheet 30 or 40 used in 20 has a plurality of convex portions 35 and 45 arranged in the arrangement directions da and db and extending in the extending direction intersecting the arrangement directions da and db. 45 includes reflection surfaces 36 and 46 that reflect the light L1 from the original image 91, and opposite surfaces 37 and 47 that face the reflection surfaces 36 and 46. The opposite surfaces 37 and 47 are uneven surfaces 39 and 49, respectively. Is included.

  Thereby, for example, the light L2 emitted from the original image 91 and reflected by the device or casing 15 existing around the original image 91 enters the optical panel 20 from a direction different from the direction in which the original image 91 exists, and the optical Even if the light L2 is incident on the opposing surfaces 37 and 47 of the convex portions 35 and 45 of the sheets 30 and 40, the light L2 is diffused by the concave and convex surfaces 39 and 49 of the opposing surfaces 37 and 47. Is suppressed. Further, for example, the light L3 emitted from the original image 91 and reflected by the device or casing 15 existing around the original image 91 is incident on the optical panel 20 from a direction different from the direction in which the original image 91 exists, and the optical sheet Even if the light is reflected by the reflective surfaces 36 and 46 of the convex portions 35 and 45 of the 30, 40 and enters the opposing surfaces 37 and 47, the light L3 is diffused by the concave and convex surfaces 39 and 49 of the opposing surfaces 37 and 47. Reflection on the opposing surfaces 37 and 47 of L3 is suppressed. Therefore, it is effective that the lights L2 and L3 reflected by the opposing surfaces 37 and 47 of the convex portions 35 and 45 of the optical sheets 30 and 40 form an image at an unintended position and are visually recognized by the observer 1 as a so-called ghost. Can be suppressed.

  When the uneven surfaces 39 and 49 of the opposing surfaces 37 and 47 include streak unevenness extending along a direction parallel to the extending direction of the convex portions 35 and 45, the uneven surfaces 39 and 49 of the opposing surfaces 37 and 47 Incident light L2 and L3 can be diffused with anisotropy. That is, the light L2 and L3 incident on the concavo-convex surfaces 39 and 49 of the opposing surfaces 37 and 47 are crossed with the direction along the extending direction of the convex portions 35 and 45 and the extending direction of the convex portions 35 and 45. And can be diffused with anisotropy. Thereby, the traveling direction of the light diffused by the uneven surfaces 39 and 49 can be effectively controlled.

  When the irregularities of the irregular surfaces 39, 49 are regularly arranged on the opposing surfaces 37, 47 in the direction intersecting with the extending direction of the convex portions 35, 45, the regularly arranged stripes The light L2 and L3 incident on the concavo-convex surfaces 39 and 49 can also be diffused using the diffraction effect due to the concavo-convex shape. Thereby, the diffusion effect of the light L2 and L3 incident on the uneven surfaces 39 and 49 can be further exhibited.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings as appropriate. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

  12 and 13 show modifications of the optical sheets 30 and 40. FIG. 12 is a cross-sectional view showing a modification of the optical sheets 30 and 40 on the main cut surfaces of the optical sheets 30 and 40, and FIG. 13 is a perspective view of the optical sheets 30 and 40 in FIG.

  In the example shown in FIGS. 12 and 13, the portion of the first support surface 31 a of the first base portion 31 of the first optical sheet 30 that is exposed from the first convex portion 35 includes the uneven surface 139. In addition, the portion of the second support surface 41 a of the second base portion 41 of the second optical sheet 40 that is exposed from the second convex portion 45 includes an uneven surface 149. In the illustrated example, the uneven surfaces 139 and 149 include a plurality of streaky unevenness. The plurality of streaky irregularities are arranged on portions of the support surfaces 31a and 41a of the base portions 31 and 41 of the optical sheets 30 and 40 that are exposed from the convex portions 35 and 45, that is, on the bottom surfaces of the concave portions 38 and 48. , Linearly extending in a direction intersecting the arrangement direction. In particular, the plurality of streaky irregularities extend along a direction parallel to the extending direction of the convex portions 35 and 45 (the extending direction of the concave portions 38 and 48). Further, the plurality of streaky irregularities are arranged without gaps on the bottom surfaces of the recesses 38 and 48 along the direction orthogonal to the extending direction of the projections 35 and 45. Therefore, the bottom surfaces of the recesses 38 and 48 are formed by a plurality of streaky irregularities arranged without gaps along a direction orthogonal to the extending direction of the projections 35 and 45. In the illustrated example, the plurality of streaky irregularities are regularly arranged on the bottom surfaces of the concave portions 38 and 48 along the direction intersecting the extending direction of the convex portions 35 and 45. Therefore, the bottom surfaces of the recesses 38 and 48 are formed by a plurality of streaky irregularities regularly arranged along a direction orthogonal to the extending direction of the projections 35 and 45. The plurality of streaky irregularities is not limited to those regularly arranged, and may be irregularly arranged. In particular, the plurality of streaky irregularities may be irregularly arranged on the bottom surfaces of the concave portions 38 and 48 along the direction intersecting the extending direction of the convex portions 35 and 45. The average arrangement pitch of the plurality of streaky irregularities arranged regularly or irregularly can be, for example, 0.1 μm or more and 10 μm or less.

  The optical sheets 30 and 40 having such an uneven surface 139 can be manufactured as follows as an example.

  In the manufacturing method of the optical sheets 30 and 40 described above, when producing the mold 70 for shaping the convex portions 35 and 45 of the optical sheets 30 and 40, first, on the first surface 70a1 of the base material 70a, An uneven surface that is complementary to the uneven surface 139 is formed by cutting or the like, and then, as described with reference to FIGS. 9 and 10, a recess 78 is formed in the base material 70a. Thereby, the metal mold | die 70 which has an uneven surface on the upper surface 75a of the convex part 75 can be obtained. Thereafter, the concave portion 78 of the mold 70 is filled with an uncured and fluid convex portion constituent composition 85, and the convex portion constituent composition 85 is also formed on the concave and convex surfaces included in the upper surface 75 a of the convex portion 75. And is irradiated with ionizing radiation to cure (solidify) the convex component constituting composition 85. Thereafter, the cured convex component composition 85 is released from the mold 70 together with the base film 86. Thus, the optical sheet having the concavo-convex surface 139 which is complementary to the shape of the concavo-convex surface of the upper surface 75a of the convex portion 75 from the convex constituent composition 85 filled in the concavo-convex surface included in the upper surface 75a of the convex portion 75. 30, 40 can be manufactured.

  The uneven surfaces 139 and 149 included in the bottom surfaces of the recesses 38 and 48 are limited to those having a plurality of streaky unevenness as long as they have a function of diffusing light incident on the bottom surfaces of the recesses 38 and 48. I can't. For example, the uneven surfaces 139 and 149 may be uneven surfaces 139 and 149 having other shapes such as a roughened surface (mat surface). Further, the concave and convex surfaces 139 and 149 included in the bottom surfaces of the concave portions 38 and 48 are not limited to those disposed on the entire bottom surface of the concave portions 38 and 48, and the concave and convex surfaces 139 and 149 are part of the bottom surfaces of the concave portions 38 and 48. May be arranged.

  According to such a modification of the optical sheets 30 and 40, the optical sheets 30 and 40 further include base portions 31 and 41 having support surfaces 31 a and 41 a that support the plurality of protrusions 35 and 45, and the protrusions 35 of the support surfaces 31 a and 41 a. , 45 include uneven surfaces 139, 149, so that the convex portions 35 of the support surfaces 31a, 41a of the base portions 31, 41 of the optical sheets 30, 40 from one side (light incident side), Light incident on the portion exposed from 45 can be diffused by the uneven surfaces 139 and 149. Thereby, when observing the virtual image 92 formed on the other side, even if the optical panel 20 and the original image 91 are arranged on the extended line in the observation direction, the original image 91 itself is displayed together with the virtual image 92. More specifically, it is possible to effectively prevent the visibility of the virtual image 92 from being deteriorated by being visually recognized from between the reflecting surfaces 36 and 46.

  FIG. 14 shows another modification of the optical sheets 30 and 40. FIG. 14 is a cross-sectional view showing another modification of the optical sheets 30 and 40 on the main cut surfaces of the optical sheets 30 and 40.

  In the example shown in FIG. 14, the first optical sheet 30 has a first low refractive index portion 138 in the concave portion 38, and the second optical sheet 40 has a second low refractive index portion in the concave portion 48. 148. In other words, the first optical sheet 30 includes a first low refractive index portion 138 disposed between two adjacent first convex portions 35, and the second optical sheet 40 includes two adjacent second convex portions. The second low refractive index portion 148 is disposed between the portions 45.

  The first low refractive index portion 138 is formed using a resin having a lower refractive index than the first convex portion 35, and is reflected at the interface between the first low refractive index portion 138 and the first convex portion 35, particularly the refractive index. It is intended to cause total reflection due to the difference. Similarly, the second low refractive index portion 148 is formed using a resin having a lower refractive index than the second convex portion 45, and is reflected at the interface between the second low refractive index portion 148 and the second convex portion 45. In particular, it is intended to cause total reflection due to the refractive index difference.

  As another modification, in the above-described embodiment, an example in which the original image 91 is a real model has been described. However, the present invention is not limited to this, and the original image itself may be an image formed as an image.

  As yet another modification, the above-described embodiment has shown an example in which the light L1 from the original image 91 is incident on the optical sheets 30 and 40 from the base portions 31 and 41 of the optical sheets 30 and 40. The optical sheet 30, 40 is not limited to this, the light L1 from the original image 91 is optically transmitted from the side opposite to the base portions 31, 41 of the optical sheet 30, 40, that is, from the convex portions 35, 45 side. The light may enter the sheets 30 and 40.

  As another modification, in the above-described embodiment, an example in which only one optical panel 20 is provided in the imaging apparatus 10 has been described. However, the present invention is not limited to this, and two or more optical panels 20 are provided. It may be. In such a modification, the first optical panel forms a first image with light from the original image, and the second optical panel forms a second image with light forming the first image. You may make it do.

  As yet another modification, in the above-described embodiment, the example in which the first optical sheet 30 and the second optical sheet 40 included in the optical panel 20 are configured identically is shown, but the present invention is not limited thereto. The first optical sheet 30 and the second optical sheet 40 may be different from each other in configuration such as dimensions and shapes.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 10 Imaging apparatus 15 Casing 20 Optical panel 30 1st optical sheet 31 1st base part 31a 1st support surface 35 1st convex part 36 1st reflective surface 37 1st opposing surface 38 1st recessed part 39 1st uneven surface 40 1st 2 Optical sheet 41 2nd base part 41a 2nd support surface 45 2nd convex part 46 2nd reflective surface 47 2nd opposing surface 48 2nd recessed part 49 2nd uneven surface 70 Mold 91 Original image 92 Virtual image

Claims (7)

An optical sheet used in an optical panel for changing the traveling direction of light from an original image incident from one side and transmitting to the other side to form an image on the other side,
A plurality of convex portions arranged in an arrangement direction and extending in an extending direction intersecting with the arrangement direction, each convex portion reflecting a light reflecting the light from the original image and a facing surface facing the reflective surface; And having
The optical sheet, wherein the facing surface includes an uneven surface.   The optical sheet according to claim 1, wherein the uneven surface includes streaky unevenness extending along a direction parallel to the extending direction.   The optical sheet according to claim 2, wherein the streaky irregularities are regularly arranged on the facing surface in a direction intersecting the extending direction. A base portion having a support surface for supporting the plurality of convex portions;
The optical sheet in any one of Claims 1-3 in which the part exposed from the said convex part of the said support surface contains an uneven surface.   The optical sheet according to claim 4, wherein the uneven surface of the support surface includes streak unevenness extending along a direction parallel to the extending direction.   The optical sheet according to claim 5, wherein the streaky unevenness of the support surface is regularly arranged in a direction intersecting the extending direction within the uneven surface of the support surface. An optical panel for changing the traveling direction of light from an original image incident from one side, transmitting to the other side, and forming an image on the other side,
A plurality of first protrusions arranged in a first arrangement direction and extending in a first extending direction intersecting the first arrangement direction, each first protrusion from an original image incident from the one side; A first optical sheet having a first reflecting surface that reflects light and a first facing surface that faces the first reflecting surface;
An original image having a plurality of second convex portions arranged in a second arrangement direction and extending in a second extending direction intersecting the second arrangement direction, and each second convex portion is reflected by the first reflecting surface A second optical sheet having a second reflecting surface that reflects light from the second reflecting surface, and a second facing surface that faces the second reflecting surface,
An optical panel, wherein at least one of the first facing surface and the second facing surface includes an uneven surface.

Images