JP2007292934A - Optical member unit and video display device equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical member unit capable of sufficiently keeping adhesive strength between optical members, and restraining the lowering of efficiency of using light, and a video display device equipped therewith. <P>SOLUTION: The optical member unit is equipped with: a light guiding member 130 constituted of a light transmissive member; a triangular prism 150 constituted of a light transmissive member; beads 162 attached to a part of the outer periphery part of the light emitting surface 132 of the light guiding member 130 and a part of the outer periphery part of the light incident surface 151 of the triangular prism 150; and a suspension member 160 having an adhesive surface 160a attached to a part of the light reflection side surface 133 of the light transmission member 130 and a part of the light reflection side surface 153 of the triangular prism 150. The suspension member 160 reflects light transmitted through a part of the light reflection side surface 133 of the light guiding member 130. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a plurality of optical members made of a light transmissive member (for example, glass), an optical member unit in which an air gap is provided between the optical members, and the optical member unit. The present invention relates to a video display device.

  2. Description of the Related Art Conventionally, an optical member (hereinafter referred to as a light guide member) configured by a light transmissive member (for example, glass) and an optical member (triangular prism) configured by a light transmissive member (for example, glass) are provided. Optical member units are generally widely known. The triangular prism is an optical member that makes a light incident direction (incident direction) different from a light emitting direction (exit direction).

  As described above, as a method of arranging the triangular prism and the light guide member that make the incident direction and the outgoing direction different from each other, an air gap having a refractive index smaller than that of the triangular prism or the light guide member is set between the triangular prism and the light guide member. The method of providing between is mentioned (nonpatent literature 1).

  According to this method, by providing an air gap between the triangular prism and the light guide member, a reduction in light utilization efficiency and color caused by part of the light being transmitted through the triangular prism without being totally reflected. Generation of unevenness can be suppressed.

Here, as a method of providing the above-described air gap, a method of using beads as a spacer can be considered. Specifically, by adhering a part of the outer peripheral part of the light output surface of the light guide member and a part of the outer peripheral part of the light incident surface of the triangular prism with an adhesive containing beads, the light output surface of the light guide member An air gap is formed by beads between the light incident surface of the triangular prism (for example, Patent Document 1).
“Projector Tips”, [Online], [March 13, 2006 search], Internet <http: // www. geocities. co. jp / Hollywood-Studio / 7057 / name1 / name3. htm> JP-A-11-231256 (Claim 1, [0010] to [0014], FIG. 2)

  On the other hand, when the entire light exit surface of the light guide member and the light incident surface of the triangular prism are in the effective range, the beads contained in the adhesive scatter light, so the light utilization efficiency of the optical member unit is reduced. Resulting in.

  Therefore, it is preferable that the amount of the adhesive containing the beads is small, but if the amount of the adhesive containing the beads is reduced, the adhesive strength between the light guide member and the triangular prism is lowered.

  Therefore, the present invention has been made to solve the above-described problem, and an optical member unit capable of sufficiently maintaining the adhesive strength between optical members and suppressing a decrease in light utilization efficiency, and the optical device. An object of the present invention is to provide a video display device including a member unit.

  One feature of the present invention includes a first light incident surface (light incident surface 131), a first light emitting surface (light emitting surface 132), and a first light reflecting side surface (light reflecting side surface 133). A first optical member (light guide member 130) constituted by a light transmissive member, a second light incident surface (light incident surface 151), a second light emitting surface (light emitting surface 152), and A second optical member (triangular prism 150) having a second light reflecting side surface (light reflecting side surface 153) and formed of a light transmitting member, and an outer peripheral portion of the first light emitting surface. The first optical member and the second light incident surface are bonded to a part and a part of the outer peripheral portion of the second light incident surface, and between the first light emitting surface and the second light incident surface. Low refractive index region forming portion for forming a low refractive index region (air gap 161) having a refractive index smaller than that of the optical member (Beads 162) and a bonding surface (bonding surface 160a) bonded to a part of the first light reflection side surface and a part of the second light reflection side surface, the first optical member And the second optical member, the optical member unit includes a suspension member (suspension member 160), and at least one of the first optical member and the second optical member has a light incident direction and a light emission. It is a member that makes the direction different, and the gist is that the suspension member reflects light that has transmitted a part of the first light reflection side surface.

  According to this feature, the suspension member is bonded to a part of the first light reflection side surface and a part of the second light reflection side surface, and suspends the first optical member and the second optical member. .

  Therefore, in order for the suspension member to increase the adhesive strength between the first optical member and the second optical member, an adhesive including a low refractive index region forming member is provided on the first light emitting surface and the second light incident surface. Even if the area to be provided is reduced, the adhesive strength between the first optical member and the second optical member is sufficiently maintained.

  As described above, since the area where the adhesive including the low refractive index region forming member is provided on the first light emitting surface and the second light incident surface can be reduced, the low refractive index region forming member included in the adhesive It is possible to suppress a decrease in light utilization efficiency caused by the above.

  In addition, the suspension member reflects the light transmitted through a part of the first light reflection side surface, thereby improving the adhesion strength between the first optical member and the second optical member. Even if it is a case where it provides, the fall of the light utilization efficiency which arises with a suspension member can be suppressed.

  One aspect of the present invention is summarized in that, in the above-described characteristics of the present invention, the suspension member is made of glass or transparent resin.

  One aspect of the present invention is summarized in that, in the above-described characteristics of the present invention, the suspension member is formed of a member of the same type as the first optical member and the second optical member.

  One feature of the present invention is the above-described feature of the present invention, wherein the adhesive surface of the suspension member is a mirror surface that reflects light transmitted through the first light reflecting side surface and the second light reflecting side surface. It is a summary.

  One feature of the present invention is the above-described feature of the present invention, wherein the first optical member is a light guide member having a quadrangular prism shape, and the second optical member has a triangular prism shape. The gist is that it is a triangular prism.

  One feature of the present invention is that in the above-described feature of the present invention, the triangular prism changes the traveling direction of the light incident from the second light incident surface and is incident from the second light incident surface. A light reflecting slope (light reflecting side surface 153b) that guides the light to the second light emitting surface side, and the suspension member has a side along the light reflecting slope on the projection surface parallel to the adhesive surface. The gist is to have (side 160 m).

  One feature of the present invention is that in the above-described feature of the present invention, the suspension member has a side (side 160n) along a normal line of the light reflecting slope on the projection plane parallel to the adhesion surface. This is the gist.

  One feature of the present invention is that an image display device includes the optical member unit having the one feature described above.

  ADVANTAGE OF THE INVENTION According to this invention, while maintaining the adhesive strength between optical members fully, the optical member unit which can suppress the fall of light utilization efficiency, and an image display apparatus provided with this optical member unit can be provided. .

  Embodiments of the present invention will be described below with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
[First Embodiment]
(Video display device)

  Hereinafter, an image display apparatus according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a video display apparatus 100 according to the first embodiment of the present invention.

  As shown in FIG. 1, the video display device 100 includes a projection lens 180 and displays an image enlarged by the projection lens 180 on a screen 200.

  In the first embodiment, the video display device 100 is described as a three-plate projector, but is not limited thereto. For example, the video display device 100 may be a single-plate projector or a rear projection television. Further, the video display device 100 may be a viewfinder used for a camera or the like.

  Hereinafter, the configuration of the video display device will be described with reference to the drawings. FIG. 2 is a diagram showing a configuration of the video display device 100 according to the first embodiment of the present invention. In FIG. 2, only the configuration related to the present invention is shown, and it is natural that the image display apparatus 100 may have other optical members (for example, a relay lens).

  As shown in FIG. 2, the video display apparatus 100 includes a plurality of light sources 110 (light source 110r, light source 110g, light source 110b), a plurality of taper rods 120 (taper rod 120r, taper rod 120g, taper rod 120b), and a plurality. Light guide member 130 (light guide member 130r, light guide member 130g, light guide member 130b), a plurality of liquid crystal panels 140 (liquid crystal panel 140r, liquid crystal panel 140g, liquid crystal panel 140b), triangular prism 150, and dichroic prism. 170 and a projection lens 180.

  The light source 110r is a light source that emits red light, and includes a red LED array 111r in which a plurality of red LEDs are arranged. Similarly, the light source 110g is a light source that emits green light, and includes a green LED array 111g in which a plurality of green LEDs are arranged. The light source 110b is a light source that emits blue light, and a plurality of blue LEDs It has a blue LED array 111b in which LEDs are arranged.

  The tapered rod 120r has a tapered shape in which the area of the light emitting surface is larger than the light incident surface, and is an optical member that reflects red light emitted from the light source 110r on the side surface of the tapered rod 120r.

  Similarly, the taper rod 120g has a taper shape in which the area of the light emission surface is larger than the light incident surface, and is an optical member that reflects green light emitted from the light source 110g on the side surface of the taper rod 120g.

  Furthermore, the taper rod 120b has a taper shape in which the area of the light emission surface is larger than the light incident surface, and is an optical member that reflects blue light emitted from the light source 110b on the side surface of the taper rod 120b.

  The light guide member 130r is made of a light transmissive member, and is a solid optical member having a quadrangular prism shape. The light transmissive member is, for example, a transparent resin such as an acrylic resin or a polycarbonate resin, or glass. Of course, the quadrangular prism shape includes a tapered shape. The light guide member 130r is an optical member that reflects the red light emitted from the light emitting surface of the tapered rod 120r to the liquid crystal panel 140r side by reflecting the light from the side surface (hereinafter, light reflecting side surface) of the light guide member 130r. .

  Similarly, the light guide member 130g is formed of a light transmissive member and is a solid optical member having a quadrangular prism shape, and guides green light emitted from the light emitting surface of the tapered rod 120g. This is an optical member that is reflected by the side surface of the optical member 130g (hereinafter referred to as a light reflecting side surface) and guided to the liquid crystal panel 140g (triangular prism 150) side. Needless to say, the quadrangular prism shape includes a tapered shape.

  The light guide member 130b is a solid optical member made of a light transmissive member and having a quadrangular prism shape, and guides blue light emitted from the light emitting surface of the tapered rod 120b. This is an optical member that is reflected by the side surface of the member 130b (hereinafter referred to as a light reflecting side surface) and guided to the liquid crystal panel 140b side. Needless to say, the quadrangular prism shape includes a tapered shape.

  Since the light guide member 130r, the light guide member 130g, and the light guide member 130b have the same configuration, they are collectively referred to as the light guide member 130 as necessary.

    The liquid crystal panel 140r modulates red light according to a video signal from a drive circuit (not shown) and outputs the modulated red light to the dichroic prism 170. Similarly, the liquid crystal panel 140g modulates green light according to a video signal from a driving circuit (not shown) and emits the light to the dichroic prism 170, and the liquid crystal panel 140b displays a video from the driving circuit (not shown). In response to the signal, blue light is modulated and emitted to the dichroic prism 170.

  The triangular prism 150 is formed of a light-transmitting member, is a solid optical member having a triangular prism shape, and changes the traveling direction of the green light emitted from the light emitting surface of the light guide member 130g. This is an optical member that leads to the liquid crystal panel 140g side. The triangular prism 150 is provided to reduce the size of the video display device 100 by changing the traveling direction of the green light emitted from the light source 110g.

  Further, an air gap 161 is provided between the light emitting surface of the light guide member 130g and the light incident surface of the triangular prism 150 so as not to prevent total reflection of green light.

  A suspension member 160 is bonded to a part of the light reflection side surface of the light guide member 130g and a part of the light reflection side surface of the triangular prism 150. The suspension member 160 has a plate-like shape made of a light transmissive member, and suspends the light guide member 130g and the triangular prism 150.

  Further, the suspension member 160 is made of the same kind of member as the light guide member 130 and the triangular prism 150.

  In the first embodiment, “same type” means that the types of members are the same. For example, when the light guide member 130 and the triangular prism 150 are made of transparent resin, the suspension member 160 is also made of transparent resin, and the light guide member 130 and the triangular prism 150 are made of glass. The suspension member 160 is also made of glass. Further, the refractive index of the light guide member 130 and the triangular prism 150 may be different from the refractive index of the suspension member 160.

  Details of the peripheral structure of the air gap 161 (that is, the optical member unit) will be described later (see FIGS. 3 and 4).

  The dichroic prism 170 combines the red light from the liquid crystal panel 140r, the green light from the liquid crystal panel 140g, and the blue light from the liquid crystal panel 140b. Specifically, the dichroic prism 170 reflects the red light from the liquid crystal panel 140r and the blue light from the liquid crystal panel 140b to the projection lens 180 side. On the other hand, the dichroic prism 170 transmits green light from the liquid crystal panel 140g.

The projection lens 180 enlarges and displays the image displayed on the liquid crystal panel 140r, the liquid crystal panel 140g, and the liquid crystal panel 140b on the screen 200. Specifically, the projection lens 180 projects the light combined by the dichroic prism 170 onto the screen 200.
(Optical member unit)

  The optical member unit according to the first embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view showing the optical member unit according to the first embodiment of the present invention. In the first embodiment, the optical member unit is a unit configured by the light guide member 130, the triangular prism 150, and the suspension member 160.

  As shown in FIG. 3, the light guide member 130 includes a light incident surface 131 on which light enters, a light output surface 132 from which light exits, and one side of the outer periphery of the light output surface 132 from one side of the outer periphery of the light incident surface 131. And a plurality of light reflecting side surfaces 133 (light reflecting side surfaces 133a to 133d). The light reflecting side surface 133 totally reflects the light incident from the light incident surface 131 and guides it to the light emitting surface 132.

  The triangular prism 150 includes a light incident surface 151 on which light is incident, a light output surface 152 from which light is emitted, and a plurality of light beams provided from one outer periphery of the light incident surface 151 to one outer periphery of the light output surface 152. It has light reflection side surfaces 153 (light reflection side surfaces 153a to 153c).

  Here, the surface direction of the light incident surface 151 is different from the surface direction of the light emitting surface 152. That is, the triangular prism 150 makes the light incident direction (light incident direction) different from the light emitting direction (light emitting direction).

  The light reflecting side surface 153 totally reflects the light incident from the light incident surface 151 and guides it to the light emitting surface 152. In particular, the light reflecting side surface 153b is a light reflecting slope that totally reflects the light incident from the light incident surface 151 and makes the light incident direction different from the light emitting direction.

  The suspension member 160 has an adhesive surface 160a bonded to a part of the light reflection side surface 133 and a part of the light reflection side surface 153, and suspends the light guide member 130g and the triangular prism 150.

  In the first embodiment, the suspension member 160 includes a first suspension member bonded to a part of the light reflection side surface 133a and a part of the light reflection side surface 153a, a part of the light reflection side surface 133c, and a light reflection side surface. And a second suspension member bonded to a part of 153c.

  Here, a region having a lower refractive index than the light guide member 130 and the triangular prism 150, that is, an air gap 161 is provided between the light emitting surface 132 of the light guide member 130 and the light incident surface 151 of the triangular prism 150. It has been.

  Specifically, a bead 162 is bonded to an outer peripheral portion of the light emitting surface 132 and an outer peripheral portion of the light incident surface 151 with an adhesive 163 in order to ensure the width of the air gap 161. Thus, the bead 162 is a member for forming the air gap 161.

  The bead 162 has a spherical shape made of, for example, borosilicate glass, and has a diameter of about 20 μm. The adhesive 163 is an adhesive that cures when irradiated with ultraviolet rays (UV), and has a refractive index of about 1.4 to 1.5 (25 ° C.) as a refractive index after curing. . Further, the beads 162 are included in the adhesive 163 in advance.

  The adhesive 163 including the beads 162 is preferably provided at the four corners of the outer peripheral portion of the light emitting surface 132 and the four corners of the outer peripheral portion of the light incident surface 151.

  As described above, by providing the air gap 161 between the light emitting surface 132 of the light guide member 130 and the light incident surface 151 of the triangular prism 150, one of the light emitted from the light emitting surface 132 of the light guide member 130 is obtained. This prevents the light utilization efficiency from being lowered without being totally reflected. For example, if the air gap 161 is not provided, a part of the light reflected from the light reflecting side surface 153b of the triangular prism 150 after being emitted from the light emitting surface 132 of the light guide member 130 is guided at a large incident angle. The light may enter the light reflecting side surface 133 of the member 130. In such a case, since the total reflection condition is not satisfied, a part of the light emitted from the light emitting surface 132 of the light guide member 130 is transmitted through the light reflecting side surface 133 of the light guide member 130 and the light use efficiency is increased. Will fall.

  FIG. 4 is a diagram illustrating an example of the optical member unit according to the first embodiment of the present invention. In addition, FIG. 4 is the figure which looked at the optical member unit from the side.

  As shown in FIG. 4, the suspension member 160 suspends the light guide member 130 and the triangular prism 150. In addition, as described above, the suspension member 160 has a plate shape formed of a light transmissive member.

  Here, the suspension member 160 is bonded to a part of the light reflection side surface 133 a of the light guide member 130 and a part of the light reflection side surface 153 a of the triangular prism 150. Further, the suspension member 160 has a refractive index larger than that of the atmosphere, that is, a refractive index comparable to that of the light guide member 130 and the triangular prism 150.

Therefore, as shown in FIG. 4, in a part of the light reflection side surface 133 a to which the suspension member 160 is bonded, the light incident from the light incident surface 131 is not totally reflected but transmits a part of the light reflection side surface 133 a. Further, the light transmitted through a part of the light reflection side surface 133a is totally reflected by the reflection surface 160b of the suspension member 160. Furthermore, in a part of the light reflection side surface 153a to which the suspension member 160 is bonded, the light reflected by the reflection surface 160b of the suspension member 160 is not totally reflected but transmits a part of the light reflection side surface 153a.
(Action and effect)

  According to the optical member unit according to the first embodiment of the present invention, the suspension member 160 is bonded to a part of the light reflection side surface 133 of the light guide member 130 and a part of the light reflection side surface 153 of the triangular prism 150. The light guide member 130 and the triangular prism 150 are suspended.

  Therefore, even if the suspension member 160 reduces the area in which the adhesive 163 including the beads 162 is provided on the light emitting surface 132 and the light incident surface 151 in order to increase the adhesive strength between the light guide member 130 and the triangular prism 150, the suspension member 160 is guided. Adhesive strength between the optical member 130 and the triangular prism 150 is sufficiently maintained.

  As described above, since the area where the adhesive 163 including the beads 162 is provided on the light reflecting side surface 133a and the light reflecting side surface 153a can be reduced, a reduction in light utilization efficiency caused by the beads 162 included in the adhesive 163 is suppressed. be able to.

  In addition, since the suspension member 160 is made of a light transmissive member (transparent resin or glass), the light transmitted through a part of the light reflection side surface 133a to which the suspension member 160 is bonded is reflected on the reflection surface of the suspension member 160. Reflected at 160b.

  Therefore, even if the suspension member 160 is provided in order to improve the adhesive strength between the light guide member 130 and the triangular prism 150, it is possible to suppress a decrease in light utilization efficiency caused by the suspension member 160.

  In addition, according to the optical member unit according to the first embodiment of the present invention, the suspension member 160 is made of the same kind of member as the light guide member 130 and the triangular prism 150, so that the light reflection of the light guide member 130 is performed. The adhesive strength between part of the side surface 133a and the suspension member 160 is increased, and the adhesive strength between part of the light reflecting side surface 153a of the triangular prism 150 and the suspension member 160 is increased.

Therefore, the suspension member 160 may further reduce the area where the adhesive 163 including the beads 162 is provided on the light reflection side surface 133a and the light reflection side surface 153a in order to further increase the adhesive strength between the light guide member 130 and the triangular prism 150. it can.
[Second Embodiment]

  Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the following, differences between the above-described first embodiment and the second embodiment will be mainly described.

  Specifically, since the suspension member 160 according to the first embodiment described above is composed of a light transmissive member, the light transmitted through the light reflection side surface 133a of the light guide member 130 is reflected by the suspension member 160. It is totally reflected by the surface 160b.

  In contrast, in the suspension member 160 according to the second embodiment, the adhesive surface 160a is a mirror surface that reflects light. In the second embodiment, since the adhesive surface 160a is a mirror surface, the suspension member 160 does not need to be configured by a light-transmitting member, and may be configured by any member.

  FIG. 5 is a diagram illustrating an example of an optical member unit according to the second embodiment of the present invention. FIG. 5 is a side view of the optical member unit.

  As shown in FIG. 5, the suspension member 160 suspends the light guide member 130 g and the triangular prism 150. The adhesive surface 160a of the suspension member 160 is a mirror surface that reflects light.

  Here, the suspension member 160 is bonded to a part of the light reflection side surface 133a of the light guide member 130 and a part of the light reflection side surface 153a of the triangular prism 150, as in the first embodiment. Therefore, if the adhesive surface 160a is not a mirror surface, light is not reflected by a part of the light reflecting side surface 133a of the light guide member 130.

On the other hand, as shown in FIG. 5, in the second embodiment, since the adhesion surface 160 a of the suspension member 160 is a mirror surface, the light is also reflected by a part of the light reflection side surface 133 a of the light guide member 130.
(Action and effect)

  According to the optical member unit according to the second embodiment of the present invention, the adhesion surface 160a of the suspension member 160 is configured by a mirror surface, so that the light reflecting side surface 133a of the light guide member 130 to which the suspension member 160 is adhered. Even part of the light is reflected.

Therefore, even if the suspension member 160 is provided in order to improve the adhesive strength between the light guide member 130 and the triangular prism 150, it is possible to suppress a decrease in light utilization efficiency caused by the suspension member 160.
[Third Embodiment]

  Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. In the following, differences between the first embodiment and the third embodiment described above will be mainly described.

Specifically, in the first embodiment described above, the outer shape of the suspension member 160 is not particularly touched, but in the third embodiment, the outer shape of the suspension member 160 will be described.
(Outline of suspension member)

  Below, the external shape of the suspension member which concerns on 3rd Embodiment of this invention is demonstrated, referring drawings. FIG. 6 is a view showing variations in the outer shape of the suspension member 160 according to the third embodiment of the present invention. FIG. 6 is a diagram showing the shape of the optical member unit on the projection plane parallel to the adhesive surface 160a of the suspension member 160.

  In FIG. 6, similarly to the first embodiment described above, the optical member unit includes a light guide member 130, a triangular prism 150, and a suspension member 160 that suspends the light guide member 130 and the triangular prism 150. ing. In addition, an air gap 161 is provided between the light emitting surface 132 of the light guide member 130 and the light incident surface 151 of the triangular prism 150.

  As shown in FIG. 6A, the suspension member 160 has a rectangular shape on a projection plane parallel to the adhesion surface 160 a of the suspension member 160, and a part of the suspension member 160 is a triangular prism 150. It protrudes outside the triangular prism 150 from the light reflecting side surface 153b.

  As described above, since a part of the suspension member 160 protrudes outside the triangular prism 150, a sufficient area of the bonding surface 160a bonded to the triangular prism 150 is ensured. On the other hand, in the process of incorporating the optical member unit into the video display device 100, a part of the suspension member 160 may interfere with the process. In addition, the suspension member 160 may be damaged.

  As shown in FIG. 6B, the suspension member 160 has a rectangular shape on a projection plane parallel to the adhesion surface 160 a of the suspension member 160, and the suspension member 160 reflects light from the triangular prism 150. The side surface 153b is disposed so as not to protrude outside the triangular prism 150.

  As described above, since the suspension member 160 is disposed so as not to protrude from the light reflection side surface 153b of the triangular prism 150 to the outside of the triangular prism 150, the process of incorporating the optical member unit into the video display device 100 is facilitated. The possibility of the member 160 being damaged is also reduced. On the other hand, since the area of the bonding surface 160a bonded to the triangular prism 150 is reduced, the bonding strength between the triangular prism 150 and the suspension member 160 is reduced.

  As shown in FIG. 6C, the suspension member 160 has a side 160m along the light reflection side surface 153b (light reflection slope) of the triangular prism 150 on the projection plane parallel to the adhesion surface 160a of the suspension member 160. is doing.

  The side 160m only needs to be along the light reflection side surface 153b of the triangular prism 150, and does not have to overlap the light reflection side surface 153b of the triangular prism 150 on the same line. Further, the side 160m may not be parallel to the light reflecting side surface 153b of the triangular prism 150.

  As described above, since the suspension member 160 has the side 160m along the light reflecting side surface 153b (light reflecting slope) of the triangular prism 150, the area of the bonding surface 160a bonded to the triangular prism 150 is sufficiently secured. The Further, the process of incorporating the optical member unit into the video display device 100 is facilitated, and the possibility that the suspension member 160 is damaged is reduced.

  As shown in FIG. 6D, the suspension member 160 has a side 160m along the light reflection side surface 153b (light reflection slope) of the triangular prism 150 on the projection plane parallel to the adhesion surface 160a of the suspension member 160; The triangular prism 150 has a side 160n along the normal a of the light reflecting side surface 153b (light reflecting slope).

  Therefore, as shown in FIG. 6D, even when the light guide members 130 are arranged on the light incident surface 151 side and the light emitting surface 152 side of the triangular prism 150 via the air gap 161, respectively. The plurality of suspension members 160 that suspend the light guide members 130 and the triangular prisms 150 do not interfere with each other. In addition, the area of the bonding surface 160a bonded to the triangular prism 150 is sufficiently secured.

  Note that the side 160n only needs to be along the normal line a, and may not overlap the normal line a. Further, the side 160n may not be parallel to the normal line a.

  Furthermore, a portion where the side 160m and the side 160n intersect may be rounded. The suspension member 160 may have a shape in which the vicinity of the corner where the side 160m and the side 160n intersect is removed.

  The normal line a is preferably a line that passes through the approximate center of the light reflection side surface 153b (light reflection slope) of the triangular prism 150 on the projection plane parallel to the adhesion surface 160a of the suspension member 160.

As described above, from the viewpoint of the adhesive strength between the triangular prism 150 and the suspension member 160 and the ease of the process of incorporating the optical member unit into the video display device 100, the suspension member 160 is shown in FIGS. It is effective to have the shape shown in (1). In particular, when a plurality of light guide members 130 are arranged on the light incident surface 151 side and the light exit surface 152 side of the triangular prism 150, the suspension member 160 has the shape shown in FIG. It is effective.
[Other Embodiments]

  Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the low refractive index region provided between the light emitting surface 132 of the light guide member 130 and the light incident surface 151 of the triangular prism 150 is the air gap 161 configured by the atmosphere. However, the present invention is not limited to this.

  Specifically, the low refractive index region may be configured by filling the air gap 161 with a light transmissive member having a refractive index smaller than that of the light guide member 130 and the triangular prism 150.

  Examples of the light transmissive member having a refractive index smaller than that of the light guide member 130 and the triangular prism 150 include transparent resins such as acrylic resin and polycarbonate resin, and low refractive index adhesives.

  In this way, by forming the low refractive index region by filling the air gap 161 with a light transmissive member having a refractive index smaller than that of the light guide member 130 and the triangular prism 150, the light exit surface 132 of the light guide member 130. And impurities such as dust can be prevented from entering between the light incident surface 151 of the triangular prism 150.

  Further, if a low refractive index adhesive is used as a light transmissive member having a refractive index smaller than that of the light guide member 130 and the triangular prism 150, the adhesive strength between the light guide member 130 and the triangular prism 150 can be further increased.

  Furthermore, in the above-described embodiment, the air gap 161 is provided between the light emitting surface 132 of the light guide member 130 and the light incident surface 151 of the triangular prism 150, but is not limited thereto. Specifically, the air gap may be provided between the light emitting surface of the triangular prism and the light incident surface of the light guide member.

  In the above-described embodiment, the optical member unit is configured by the light guide member 130 and the triangular prism 150, but is not limited to this. Specifically, the optical member unit may be configured by a triangular prism and a triangular prism.

  Further, in the above-described embodiment, the optical member unit includes the optical member that changes the traveling direction of the green light emitted from the light source 110g, but is not limited thereto, and the traveling direction of the red light emitted from the light source 110r. An optical member that changes the traveling direction of blue light emitted from the light source 110b may be included. Further, the optical member unit may include an optical member that changes a traveling direction of light in which a plurality of colors of light are mixed, and an optical member that changes a traveling direction of complementary color (for example, yellow) light. Also good.

  In the above-described embodiment, the liquid crystal panel 140 is used as the light modulation element. However, the present invention is not limited to this, and a DMD (Digital Micro Mirror Device) or a reflective liquid crystal panel may be used as the light modulation element. .

  Furthermore, in the above-described embodiment, the light guide member 130 has a quadrangular prism shape, but is not limited thereto, and may have a cylindrical shape, a polygonal column shape, or the like. Similarly, in the above-described embodiment, the light guide member 130 has a triangular prism shape, but is not limited thereto, and may have a cylindrical shape, a polygonal column shape, or the like.

  In the first embodiment described above, the suspension member 160 is configured by the same type of member as the light guide member 130 and the triangular prism 150. However, the present invention is not limited to this, and the light guide member 130 and the triangular prism are not limited thereto. It may be configured by a member different from 150.

  Furthermore, in each of the above-described embodiments, each light source 110 has an LED array of each color, but the present invention is not limited to this, and each color LED may have a single LED.

  Further, in the above-described embodiment, chamfering may be performed on ridgelines of optical members such as the taper rod 120, the light guide member 130, the triangular prism 150, and the suspension member 160.

  Further, in the above-described embodiment, the triangular prism 150 changes the traveling direction of light by totally reflecting the light at the light reflecting side surface 153b. However, the present invention is not limited to this. For example, the triangular prism 150 may have a configuration in which aluminum deposited on the light reflecting side surface 153b is used as a mirror surface.

1 is a diagram showing a video display device 100 according to a first embodiment of the present invention. It is a figure which shows the structure of the video display apparatus 100 which concerns on 1st Embodiment of this invention. It is a perspective view which shows the optical member unit which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the optical member unit which concerns on 1st Embodiment of this invention. It is a figure which shows an example of the optical member unit which concerns on 2nd Embodiment of this invention. It is a figure which shows the variation of the external shape of the suspension member 160 which concerns on 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Video display apparatus, 110 ... Light source, 111 ... LED array, 120 ... Tapered rod, 130 ... Light guide member, 131 ... Light incident surface, 132 ... Light emission Surface: 133: Light reflecting side surface, 140: Liquid crystal panel, 150: Triangular prism, 151: Light incident surface, 152: Light emitting surface, 153: Light reflecting side surface, 160 ..Suspension member, 160a ... adhesive surface, 160b ... reflecting surface, 161 ... air gap, 162 ... bead, 163 ... adhesive, 170 ... dichroic prism, 180・ Projection lens, 200 ... screen

Claims (8)

A first optical member having a first light incident surface, a first light emitting surface, and a first light reflecting side surface, and configured by a light transmissive member;
A second optical member having a second light incident surface, a second light emitting surface, and a second light reflecting side surface, and configured by a light transmissive member;
Bonded to a part of the outer periphery of the first light exit surface and a part of the outer periphery of the second light entrance surface, and between the first light exit surface and the second light entrance surface A low refractive index region forming member for forming a low refractive index region having a refractive index smaller than that of the first optical member and the second optical member;
An adhesive surface that is bonded to a part of the first light reflection side surface and a part of the second light reflection side surface is provided, and the first optical member and the second optical member are suspended. A suspension member,
At least one of the first optical member and the second optical member is a member that makes the light incident direction different from the light emitting direction,
The said suspension member reflects the light which permeate | transmitted a part of said 1st light reflection side surface, The optical member unit characterized by the above-mentioned.   The optical member unit according to claim 1, wherein the suspension member is made of glass or transparent resin.   The optical member unit according to claim 2, wherein the suspension member is configured by a member of the same type as the first optical member and the second optical member.   2. The optical member unit according to claim 1, wherein the adhesive surface of the suspension member is a mirror surface that reflects light transmitted through the first light reflection side surface and the second light reflection side surface. The first optical member is a light guide member having a quadrangular prism shape,
The optical member unit according to claim 1, wherein the second optical member is a triangular prism having a triangular prism shape. The triangular prism has a light reflecting slope that changes the traveling direction of light incident from the second light incident surface and guides light incident from the second light incident surface to the second light emitting surface side. And
The optical member unit according to claim 5, wherein the suspension member has a side along the light reflection slope on a projection plane parallel to the adhesion surface.   The optical member unit according to claim 6, wherein the suspension member has a side along a normal line of the light reflecting slope on the projection plane parallel to the adhesion surface.   An image display device comprising the optical member unit according to claim 1.

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