Patent Application
20120140479
The present invention relates to an indicator apparatus that can be used in an elevator operating panel, for example.
In conventional elevator operating panels, a button frame that is made of a light-transmitting material is disposed between an outer perimeter of a button and a surface plate. A light source is disposed behind the button frame. Operational states of the button are made known to a user by the light source being switched on or off (see Patent Literature 1, for example).
In conventional indicators that are disposed on door panels of VTR devices, a metal coating is applied to a surface of a light-transmitting member by sputtering in order to impart a sense of integration with the door panel (see Patent Literature 2, for example).
Japanese Patent Laid-Open No. 2002-53274 (Gazette)
Japanese Patent Laid-Open No. HEI 5-273928 (Gazette)
In conventional elevator operating panels such as those described above, the button frame is illuminated when the light source is lit, but the outward appearance of the button frame itself is visible when the light source is not lit, reducing decorative design. In answer to that, methods in which a metal coating is formed on the surface of the button frame are also conceivable, but in that case manufacturing costs are increased. Particularly with parts that are relatively large in size such as parts that are used in elevator operating panels, the number of parts that can be accommodated simultaneously inside a vacuum chamber is small, making manufacturing efficiency low and costs high. If a metal coating is applied, it is also necessary to apply a protective film so as to not to be peeled off even if handled directly. In addition, decorative design freedom is low if a metallic luster is simply imparted to the surface of the light-transmitting member.
The present invention aims to solve the above problems and an object of the present invention is to provide an indicator apparatus that can improve decorative design and decorative design freedom at reduced cost.
In order to achieve the above object, according to one aspect of the present invention, there is provided an indicator apparatus including: a light source; a prism member including: a prism member side surface; and a transmitting and reflecting surface that is inclined relative to the prism member side surface, and into which light is admitted from the light source, the prism member transmitting the light from the light source; and an adjacent member that has an adjacent surface that is adjacent to the prism member side surface, wherein the adjacent surface is visible due to optical reflection at the transmitting and reflecting surface if the prism member is viewed frontally when the light source is lit.
In an indicator apparatus according to the present invention, since light passes through the prism member making the prism member appear to shine when the light source is lit, and the decorative design of the adjacent surface is visible in the prism member when the light source is not lit, the decorative design of the prism member when the light source is not lit can be made similar to the material, color, pattern, etc., of the adjacent surface, enabling decorative design and decorative design freedom to be improved at reduced cost.
Preferred embodiments of the present invention will now be explained with reference to the drawings.
The operating button 2 is able to reciprocate toward and away from the button unit 5. A push-button switch apparatus is constituted by the operating button 2, the button unit 5, and the switch portion. On pressing and operating the operating button 2, a destination floor is registered in an elevator controlling apparatus (not shown), and the light sources 7 of the push-button switch apparatus that is operated are lit.
The operating button 2 has: a plunger 8; a button cap 9 that is fixed to the plunger 8; and a button cover 10 that is placed over a surface of the button cap 9. The button cover 10 is made of a metal material that is identical or similar to that of the surface plate 1. In other words, a front surface of the surface plate 1 and a front surface of the operating button 2 are made of an identical or similar metal material.
The plunger 8 and the button cap 9 are made of a material that transmits light, such as a transparent or opalescent resin, for example. An aperture that is shaped like a floor number is disposed on the button cover 10. Thus, when the light sources 7 are lit, light passes through this aperture in the button cover 10, and the floor number appears to shine.
A ring-shaped prism member (a button frame) 11 is disposed between an inner peripheral surface of the button aperture 1a and an outer peripheral surface of the operating button 2. In Embodiment 1, the surface plate 1 is a first adjacent member that is adjacent to a first side of the prism member 11, and the operating button 2 is a second adjacent member that is adjacent to a second side of the prism member 11.
The prism member 11 is made of a transparent resin. The light sources 7 are disposed behind the prism member 11 so as to be uniformly spaced apart from each other in a circumferential direction. In addition, a tip end portion of the prism member 11 protrudes slightly outward from the button aperture 1a.
The prism member front surface 11d is parallel to the front surface of the surface plate 1 and the front surface of the operating button 2. The prism member side surface 11a is perpendicular to the prism member front surface 11d. The fixed portion 11c is fixed to a peripheral edge portion of the button aperture 1a. The fixed portion 11c may be disposed in a flange shape so as to be continuous around an entire perimeter of the prism member 11 or may also be disposed only on a portion thereof.
The transmitting and reflecting surface 11b is inclined at a predetermined angle (45 degrees, for example) relative to an optical axis direction of the light sources 7 that are disposed directly below. When the light sources 7 are lit, the perimeter of the operating button 2 shines in a ring shape due to the light that is admitted through the transmitting and reflecting surface 11b passing through the prism member 11.
The prism member side surface 11a is adjacent to and faces an outer peripheral surface 10a of the button cover 10. In other words, the outer peripheral surface 10a is an adjacent surface that is adjacent to the prism member side surface 11a. The outer peripheral surface 10a is made of a metal material that is identical or similar to that of the front surface of the surface plate 1 and the front surface of the operating button 2.
When the light sources 7 are not lit, the outer peripheral surface 10a that is optically reflected by the transmitting and reflecting surface 11b is visible on the prism member front surface 11d. In other words, if the prism member 11 is viewed frontally when the light sources 7 are not lit, the outer peripheral surface 10a is visible by optical reflection at the transmitting and reflecting surface 11b.
In an elevator operating panel of this kind, because decorative design of the prism member 11 can be made similar to the outer peripheral surface 10a when the light sources 7 are not lit while maintaining a function of making the perimeter of the operating button 2 shine when the light sources 7 are lit, decorative design and decorative design freedom can be improved using a simple construction.
Costs of the prism member 11 can be reduced compared to when a metal coating (a half mirror coating, etc.) is formed on the prism member front surface 11d. In addition, if a metal coating is formed, it is also necessary to form a protective film to prevent peeling if handled directly, but in the prism member 11 according to Embodiment 1, deterioration can be prevented even if a protective film is not disposed.
Because the front surface of the surface plate 1, the front surface of the operating button 2, and the outer peripheral surface 10a are made of identical or similar materials, a sense of design uniformity can be imparted to the entire operating panel, enabling decorative design to be improved. In addition to using identical or similar materials, decorative design can also be further improved by applying identical or similar surface machining (such as hairlining or figuring), for example.
Next,
The transmitting and reflecting surface 12b is inclined at a predetermined angle relative to an optical axis direction of the light sources 7 that are disposed directly below. When the light sources 7 are lit, the perimeter of the operating button 2 shines in a ring shape due to the light that is admitted through the transmitting and reflecting surface 12b passing through the prism member 12.
The prism member side surface 12a is adjacent to and faces an inner peripheral surface 1b of a button aperture 1a. In other words, in Embodiment 2, the inner peripheral surface 1b is an adjacent surface that is adjacent to the prism member side surface 12a.
When the light sources 7 are not lit, the inner peripheral surface 1b that is optically reflected by the transmitting and reflecting surface 12b is visible on the prism member front surface 12d. In other words, if the prism member 12 is viewed frontally when the light sources 7 are not lit, the inner peripheral surface 1b is visible by optical reflection at the transmitting and reflecting surface 12b. The rest of the configuration is identical or similar to that of Embodiment 1.
Decorative design and decorative design freedom can be improved at reduced cost even if the inner peripheral surface 1b of the button aperture 1a is shown by reflection at the transmitting and reflecting surface 12b in this manner when the light sources 7 are not lit.
Next,
The first and second transmitting and reflecting surfaces 13c and 13d overlap partially with each other when viewed in the direction of transmission of light from the light sources 7. The transmitting and reflecting surfaces 13c and 13d are inclined at a predetermined angle relative to an optical axis direction of the light sources 7 that are disposed directly below. When the light sources 7 are lit, the perimeter of the operating button 2 shines in a ring shape due to the light that is admitted through the transmitting and reflecting surfaces 13c and 13d passing through the prism member 13.
The first prism member side surface 13a is adjacent to and faces an outer peripheral surface 10a of the button cover 10. The second prism member side surface 13b is adjacent to and faces an inner peripheral surface 1b of a button aperture 1a. In other words, in Embodiment 3, the adjacent surfaces are the outer peripheral surface 10a and the inner peripheral surface 1b.
When the light sources 7 are not lit, the outer peripheral surface 10a and the inner peripheral surface 1b that are optically reflected by the transmitting and reflecting surfaces 13c and 13d is visible on the prism member front surface 13f. In other words, if the prism member 13 is viewed frontally when the light sources 7 are not lit, the outer peripheral surface 10a and the inner peripheral surface 1b are visible by optical reflection at the transmitting and reflecting surfaces 13c and 13d. The rest of the configuration is identical or similar to that of Embodiment 1.
In the prism member 11 according to Embodiment 1, for example, a connecting portion 11e (
Next,
Using a configuration of this kind, the connecting portion can also be hidden when the light sources 7 are not lit, enabling decorative design to be further improved.
Next,
The connecting portion can also be hidden when the light sources 7 are not lit by extending the transmitting and reflecting surface 15b to the back portion of the surface plate 1 in this manner, enabling decorative design to be further improved.
Next,
A cross section of the prism member front surface 16d is curved into a circular arc shape such that a center thereof protrudes. The rest of the configuration is identical or similar to that of Embodiment 1.
By curving the prism member front surface 16d in this manner, some regions of the transmitting and reflecting surface 16b are visible on the prism member front surface 16d so as to be enlarged when the light sources 7 are not lit. Because of this, the connecting portion can be hidden when the light sources 7 are not lit, enabling decorative design to be further improved.
Moreover, in Embodiment 6, the cross section of the prism member front surface 16d is curved into a circular arc shape such that the center thereof protrudes, but may also be curved into a concave circular arc shape such that the center is formed into a hollow.
Next,
Using a configuration of this kind, the connecting portion can also be hidden when the light sources 7 are not lit even if the thickness of the connecting portion is somewhat thicker, enabling decorative design to be further improved.
Next,
Using a configuration of this kind, the connecting portion can also be hidden when the light sources 7 are not lit even if the thickness of the connecting portion is somewhat thicker, enabling decorative design to be further improved.
Moreover, the radii of curvature of the cross sections of the prism member front surface 16a and the transmitting and reflecting surface 16b are set to correspond appropriately to the thickness of the connecting portion. By curving the cross sections of the prism member front surface 16a and the transmitting and reflecting surface 16b, the adjacent surface can be made to look larger or smaller as required, thereby also enabling decorative design freedom to be improved.
Next,
The prism member 17 has: a prism member side surface 17a that is an upper surface; a transmitting and reflecting surface 17b that is inclined relative to the prism member side surface 17a, and into which light from light sources 7 is admitted; a fixed portion 17c that is fixed to a back surface of the surface plate 1; and a prism member front surface 17d that is a decorative design surface that is exposed outside the operating panel.
The prism member front surface 17d is parallel to the front surface of the surface plate 1 and the front surface of the operating button 2. The prism member side surface 17a is perpendicular to the prism member front surface 17d. The fixed portion 17c is fixed to an edge portion of the button aperture 1a. The fixed portion 17c may be disposed so as to be continuous along an entire length of the prism member 17 or may also be disposed only on a portion thereof.
The transmitting and reflecting surface 17b is inclined at a predetermined angle relative to an optical axis direction of the light sources 7 that are disposed directly below. When the light sources 7 are lit, a lower portion of the operating button 2 shines due to the light that is admitted through the transmitting and reflecting surface 17b passing through the prism member 17.
The prism member side surface 17a is adjacent to and faces an outer peripheral surface 10a of a button cover 10. In other words, in Embodiment 9, the outer peripheral surface 10a is an adjacent surface that is adjacent to the prism member side surface 17a. Letters are applied to the outer peripheral surface 10a by printing or engraving, etc. In this case, information that relates to a building floor, “RESTAURANT”, for example, is printed as characters that are applied to the outer peripheral surface 10a.
When the light sources 7 are not lit, the outer peripheral surface 10a that is optically reflected by the transmitting and reflecting surface 17b is visible on the prism member front surface 17d. In other words, if the prism member 17 is viewed frontally when the light sources 7 are not lit, the outer peripheral surface 10a is visible by optical reflection at the transmitting and reflecting surface 17b. Because of this, the characters “RESTAURANT” are also visible on the prism member front surface 17d when the light sources 7 are not lit.
By reflecting and displaying on the prism member front surface 17d characters that are applied to the outer peripheral surface 10a in this manner, it is no longer necessary to dispose the characters on the prism member 17 itself, enabling decorative design when the light sources 7 are lit to be improved. Since users do not touch the characters directly, the characters can be prevented from peeling off or fading, enabling decorative design to be maintained for a long period.
Moreover, tenant names, for example, may also be printed as the information that relates to the building floors.
The outer peripheral surface 10a may also be colored, or a colored pattern or a pattern using machining (hairlining, etc.) applied, either instead of the characters or in addition to the characters, and that color or pattern can be shown when the light sources 7 are not lit, enabling decorative design freedom to be improved.
Now, in Embodiment 1, a sense of design uniformity was imparted by making the material of the outer peripheral surface 10a identical or similar to that of the front surface of the surface plate 1 and the front surface of the operating button 2, but the visibility of the operating button 2 can also conversely be increased by making the material or decorative design of the adjacent surface different than that of the front surface of the surface plate 1 and the front surface of the operating button 2.
In addition, Embodiments 1 through 9 may also be implemented in combination with each other as required. For example, in Embodiments 1 through 8, characters, color, pattern, etc., may also be applied to the adjacent surface. In other words, a decorative design that is different than that of the front surface of the adjacent member may also be disposed on the adjacent surface. The prism member front surface 17d and the transmitting and reflecting surface 17b according to Embodiment 9 may also be curved.
The prism members 11 through 16 according to Embodiments 1 through 8 may also be disposed only on a portion of the outer perimeter of the operating button 2, or may also be divided circumferentially.
The prism member 17 according to Embodiment 9 may also be disposed around the entire perimeter of the operating button 2, or may also be disposed on another side thereof.
Next,
Using a configuration of this kind, disposing light sources 7 directly below the prism member 11 can be dispensed with, enabling costs to be reduced by reducing the number of light sources 7.
Moreover, the light-directing member is not limited to the reflector 18, and may also be a member that diffuses light passing through internally.
A light-directing member such as that shown in Embodiment 10 may also be applied to the configurations of Embodiments 2 through 8.
Next,
Tabular salient portions 21b that protrude perpendicularly to the front surface of the surface plate 21 are disposed on edge portions of the apertures 21a on a rear surface of the surface plate 21. The prism members 22 are fixed to the salient portions 21b.
In addition, the prism members 22 have: a prism member side surface 22a that is an upper surface; a transmitting and reflecting surface 22b that is inclined relative to the prism member side surface 22a, and into which light from light sources 24 is admitted; and a prism member front surface 22c that is a decorative design surface that is exposed externally through the apertures 21a. The prism member front surface 22d is parallel to (in this case, flush with) the front surface of the surface plate 21. The prism member side surface 22a is perpendicular to the prism member front surface 22c.
The transmitting and reflecting surface 22b is inclined at a predetermined angle (45 degrees, for example) relative to an optical axis direction of the light sources 24 that are disposed directly below. When the light sources 24 are lit, the perimeter of the prism member front surface 22c shines due to the light that is admitted through the transmitting and reflecting surface 22b passing through the prism member 22.
The prism member side surfaces 22a are adjacent to and joined to lower surfaces 21c of the salient portions 21b. In other words, in Embodiment 11, the adjacent member is the surface plate 21, and the adjacent surface that is adjacent to the prism member side surface 22a is the lower surface 21c. The lower surface 21c is made of a metal material that is identical or similar to that of the front surface of the surface plate 21.
When the light sources 24 are not lit, the lower surface 21c that is optically reflected by the transmitting and reflecting surface 22b is visible on the prism member front surface 22c. In other words, if the prism member 22 is viewed frontally when the light sources 24 are not lit, the lower surface 21c is visible by optical reflection at the transmitting and reflecting surface 22b.
In an indicator apparatus of this kind, because decorative design of the prism members 22 can be made similar to the lower surfaces 21c of the salient portions 21b when the light sources 24 are not lit while maintaining a function of making the prism members 22 shine when the light sources 24 are lit, decorative design and decorative design freedom can be improved using a simple construction.
Costs of the prism members 22 can be reduced compared to when a metal coating (a half mirror coating, etc.) is formed on the prism member front surface 22c. In addition, if a metal coating is formed, it is also necessary to form a protective film to prevent peeling if handled directly, but in the prism member 22 according to Embodiment 11 deterioration can be prevented even if a protective film is not disposed.
Because the front surface of the surface plate 21 and the lower surfaces 21c of the salient portions 21b are made of identical or similar materials, a sense of design uniformity can be imparted to the entire indicator apparatus, enabling decorative design to be improved.
Moreover, in Embodiment 11, prism members 22 that have a rectangular frontal shape are shown, but the frontal shape of the prism members 22 is not limited to this, and may also be circular, or ring-shaped as shown in Embodiment 1, for example.
Configurations such as those shown in Embodiments 3 through 10 may also be combined with the type of indicator apparatus that is shown in Embodiment 11. For example, the prism member front surface 22c may also be curved into a circular arc shape. Letters, color, pattern, etc., may also be applied to the lower surfaces 21c of the salient portions 21b. In other words, a decorative design that is different than that of the front surface of the surface plate 21 may also be disposed on the lower surfaces 21c.
Next,
A tubular salient portion 31b that protrudes perpendicularly to the front surface of the front panel 31 is disposed on a rear surface of the front panel 31. The prism member 32 is fixed inside the salient portion 31b.
The prism member 32 has: a prism member side surface 32a that is an outer peripheral surface; a transmitting and reflecting surface 32b that is inclined relative to the prism member side surface 32a, and into which light from the light sources 34 is admitted; and a prism member front surface 32c that is a decorative design surface that is exposed externally through the front surface of the front panel 31. The prism member front surface 32c is parallel to (in this case, flush with) the front surface of the front panel 31. The prism member side surface 32a is perpendicular to the prism member front surface 32c.
The transmitting and reflecting surface 32b is inclined at a predetermined angle (45 degrees, for example) relative to an optical axis direction of the light sources 34 that are disposed directly below. When the light sources 34 are lit, the perimeter of the prism member front surface 32c shines due to the light that is admitted through the transmitting and reflecting surface 32b passing through the prism member 32.
The prism member side surface 32a is adjacent to and joined to an inner surface 31c of the salient portion 31b. In other words, in Embodiment 12, the adjacent member is the front panel 31, and the adjacent surface that is adjacent to the prism member side surface 32a is the inner surface 31c. The inner surface 31c is made of a metal material that is identical or similar to that of the front surface of the front panel 31.
When the light sources 34 are not lit, the inner surface 31c that is optically reflected by the transmitting and reflecting surface 32b is visible on the prism member front surface 32c. In other words, if the prism member 32 is viewed frontally when the light sources 34 are not lit, the inner surface 31c is visible by optical reflection at the transmitting and reflecting surface 32b.
In an indicator apparatus of this kind, because decorative design of the prism member 32 can be made similar to the inner surface 31c of the salient portion 31b when the light sources 34 are not lit while maintaining a function of making the prism member 32 shine when the light sources 34 are lit, decorative design and decorative design freedom can be improved using a simple construction.
Costs of the prism member 32 can be reduced compared to when a metal coating (a half mirror coating, etc.) is formed on the prism member front surface 32c. In addition, if a metal coating is formed, it is also necessary to form a protective film to prevent peeling if contacted by a hand or a recording medium, but in the prism member 32 according to Embodiment 12 deterioration can be prevented even if a protective film is not disposed.
Because the front surface of the front panel 31 and the inner surface 31c of the salient portion 31b are made of identical or similar materials, a sense of design uniformity can be imparted to the entire indicator apparatus, enabling decorative design to be improved.
Moreover, in Embodiment 12, the prism member 32 is disposed so as to surround the insertion aperture 31a, but may also be disposed on only a portion of the perimeter of the insertion aperture 31a, such as only above or below, for example.
A plurality of prism members may also be disposed so as to be spaced apart from each other around the entire perimeter or on a portion of the perimeter of the insertion aperture 31a.
In addition, configurations such as those shown in Embodiments 3 through 10 may also be combined with the type of card slot indicator apparatus that is shown in Embodiment 12. For example, the prism member front surface 32c may also be curved into a circular arc shape. Letters, color, pattern, etc., may also be applied to the inner surface 31c of the salient portion 31b. In other words, a decorative design that is different than that of the front surface of the front panel 31 may also be disposed on the inner surface 31c.
Furthermore, a card slot indicator apparatus according to Embodiment 12 may also be disposed on a reading apparatus that reads information from recording media, or may also be disposed on a reading and writing apparatus that records information on recording media.
Equipment that is mounted to an automobile is merely an example, and the present invention can be applied to card slot indicator apparatuses on any type of equipment.
Next,
A ring-shaped prism member (a cylinder frame) 44 is disposed between an inner peripheral surface of the key cylinder mounting aperture 41a and an outer peripheral surface of the key cylinder 42. The prism member 44 is made of a transparent resin.
A tubular salient portion 41b that protrudes perpendicularly to the front surface of the surface plate 41 is disposed on a rear surface of the surface plate 41. The prism member 44 is fixed inside the salient portion 41b.
The prism member 44 has: a prism member side surface 44a that is an outer peripheral surface; a transmitting and reflecting surface 44b that is inclined relative to the prism member side surface 44a, and into which light from the light sources 46 is admitted; and a prism member front surface 44c that is a decorative design surface that is exposed externally through the front surface of the surface plate 41. The prism member front surface 44c is parallel to (in this case, flush with) the front surface of the surface plate 41. The prism member side surface 44a is perpendicular to the prism member front surface 44c.
The transmitting and reflecting surface 44b is inclined at a predetermined angle (45 degrees, for example) relative to an optical axis direction of the light sources 46 that are disposed directly below. When the light sources 46 are lit, the perimeter of the prism member front surface 44c shines due to the light that is admitted through the transmitting and reflecting surface 44b passing through the prism member 44.
The prism member side surface 44a is adjacent to and joined to an inner peripheral surface 41c of the salient portion 41b. In other words, in Embodiment 13, the adjacent member is the surface plate 41, and the adjacent surface that is adjacent to the prism member side surface 44a is the inner peripheral surface 41c. The inner peripheral surface 41c is made of a metal material that is identical or similar to that of the front surface of the surface plate 41.
When the light sources 46 are not lit, the inner peripheral surface 41c that is optically reflected by the transmitting and reflecting surface 44b is visible on the prism member front surface 44c. In other words, if the prism member 44 is viewed frontally when the light sources 46 are not lit, the inner peripheral surface 41c is visible by optical reflection at the transmitting and reflecting surface 44b.
In an indicator apparatus of this kind, because decorative design of the prism member 44 can be made similar to the inner peripheral surface 41c of the salient portion 41b when the light sources 46 are not lit while maintaining a function of making the prism member 44 shine when the light sources 46 are lit, decorative design and decorative design freedom can be improved using a simple construction.
Costs of the prism member 44 can be reduced compared to when a metal coating (a half mirror coating, etc.) is formed on the prism member front surface 44c. In addition, if a metal coating is formed, it is also necessary to form a protective film to prevent peeling if contacted by a hand or a key, but in the prism member 44 according to Embodiment 13 deterioration can be prevented even if a protective film is not disposed.
Because the front surface of the surface plate 41 and the inner peripheral surface 41c of the salient portion 41b are made of identical or similar materials, a sense of design uniformity can be imparted to the entire indicator apparatus, enabling decorative design to be improved.
Moreover, in Embodiment 13, the prism member 44 is disposed so as to surround the key cylinder 42, but may also be disposed on only a portion of the perimeter of the key cylinder 42.
A plurality of prism members may also be disposed so as to be spaced apart from each other around the entire perimeter or on a portion of the perimeter of the key cylinder 42.
In addition, configurations such as those shown in Embodiments 3 through 10 may also be combined with the type of keyhole indicator apparatus that is shown in Embodiment 13. For example, the prism member front surface 44c may also be curved into a circular arc shape. Letters, color, pattern, etc., may also be applied to the inner peripheral surface 41c of the salient portion 41b. In other words, a decorative design that is different than that of the front surface of the surface plate 41 may also be disposed on the inner peripheral surface 41c. In addition, the adjacent surface may also be disposed on a side of the key cylinder 42, or adjacent surfaces may also be disposed on both the surface plate 41 and the key cylinder 42.
Furthermore, a keyhole indicator apparatus that is mounted to an automobile is merely an example, and the present invention can be applied to keyhole indicator apparatuses on any type of equipment or building.
In Embodiments 1 through 13, abrasive blasting may also be applied to the prism member front surface. In that case, light can be shone uniformly when the light sources are lit, and the decorative design when the light sources are not lit can also be improved.
In addition, in Embodiments 1 through 13, the material of the prism member is not limited to a resin, and may also be glass, for example.
Furthermore, in Embodiments 1 through 13, the adjacent member may also be a film or a sheet that is bonded to the prism member side surface.
Here, because the adjacent surface is totally reflected on emission from the prism member if set to greater than a critical angle θc, it is preferable to set the angle of inclination θ1 of the transmitting and reflecting surface (see
θ1>θc=sin−1(1/n)
If the prism member is made of an acrylic, light is totally reflected at greater than or equal to an angle of incidence of 42.2 degrees, and if made of a polycarbonate, light is totally reflected at greater than or equal to an angle of incidence of 39.9 degrees. Because of this, it is preferable to set the angle of inclination θ1 of the transmitting and reflecting surface to greater than 42.2 degrees for an acrylic, and greater than 39.9 degrees for a polycarbonate.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2009/067644 | 10/9/2009 | WO | 00 | 2/9/2012 |
