JP6614892B2 - Rear projection image display device - Google Patents

Description

  The present invention relates to a rear projection video display device, and more particularly to a transmission screen holding structure of a multi-vision rear projection video display device in which a plurality of rear projection video display devices are arranged to form a large screen. .

  In recent years, large screen displays have attracted attention for various monitoring system applications or shopping mall signage applications. As a method for constructing a large screen, multi-vision in which a plurality of rear projection video display devices, liquid crystal display devices, or the like are combined vertically and horizontally is common. A rear projection type video display device is a device that generally projects video light from a projection device from the back of a transmissive screen and displays an image on the transmissive screen.

  As a conventional rear projection image display device for multivision, for example, there is a device disclosed in Patent Document 1. A rear projection image display device described in Patent Document 1 includes a transmission screen configured by superimposing two sheet-like members having transparency, and a support member that supports a rear edge of the transmission screen. And a projection unit that projects an image toward the back of the transmissive screen. The two sheet-like members constituting the transmissive screen are connected to each other by attaching an adhesive sheet to the entire side surface of the two sheet-like members of the transmissive screen.

  Here, the two sheet-like members constituting the transmissive screen are a Fresnel lens that converts light from the light source into substantially parallel light, and a lenticular lens for the purpose of securing a viewing angle by image formation and diffusion. The second adhesive tape is attached to the entire circumference over the side surface of the transmission screen connected by the first adhesive tape and a part of the side surface of the screen support member.

  In a large-screen monitoring system using multivision, multiple rear-projection image display devices are connected in the vertical and horizontal directions to display a large screen image, but the joint width between the screen screens, that is, the image is not displayed. It is necessary to make the region as small as possible, and in the screen holding structure in each rear projection type image display device, a structure having high holding strength while reducing the joint width is required.

  In the rear projection type image display device described in Patent Document 1, in order to reduce the joint width, a screen support member having a light shielding function is provided so as to protrude forward from the screen support frame, and a resin-made Fresnel lens. A notch-shaped portion is formed on the outer peripheral end surface of the screen so as to be flush with the tip of the screen support member. In a state where the cut-out shape portion of the Fresnel lens and the tip portion of the screen support member are fitted, the screen support member is integrally fixed to the screen support member with an adhesive tape together with the lenticular lens.

  Further, in the rear projection type image display device described in Patent Document 2, the first adhesive sheet is disposed so as to extend over the entire side surfaces of the Fresnel lens and the lenticular lens, and the Fresnel lens and the lenticular lens are further formed thereon. A second pressure-sensitive adhesive sheet is disposed across the side surface and part of the side surface of the screen support member so as to extend over the entire circumference. That is, the lenticular lens is fixed to the Fresnel lens and the screen support member with two types of adhesive sheets. The integrated Fresnel lens and lenticular lens are further held on the screen support member by a biasing fitting, and the screen support member is attached to a metal screen support frame. As a result, the transmission type screen composed of the Fresnel lens and the lenticular lens is integrally held, and a narrow joint width is realized at low cost while ensuring the holding strength.

  Further, in the rear projection type image display device described in Patent Document 3, a member having a T-shaped cross section is inserted between each end surface of the lenticular lens and the Fresnel lens, thereby bonding with higher adhesive strength than the adhesive tape. The agent is fixed.

JP 2006-98535 A JP 2006-259229 A JP 2007-127950 A

  In the rear projection type image display device described in Patent Document 1, the Fresnel lens and the lenticular lens are fixed to the screen support member by the same adhesive tape on the outer peripheral end surface. Therefore, when the Fresnel lens and lenticular lens expand or contract due to environmental changes such as temperature or humidity during transportation or warehouse storage, stress concentrates on the outer periphery of the lenticular lens and the lenticular lens, and adhesion There is a problem that a warp change appears in each central part that is not performed, and problems such as separation occur.

  Although the Fresnel lens and lenticular lens are held on the same side with the same adhesive tape, the side surface has a very small area. Therefore, the Fresnel lens and the lenticular lens adhere to each other due to the difference in expansion or contraction between the Fresnel lens and the lenticular lens. There were problems such as tape floating or peeling. Furthermore, since it is held only by the adhesive force of the adhesive tape, there is a problem that the screen falls due to the weight of the lenticular lens, although it is slight.

  In the rear projection type image display device described in Patent Document 2, the linear expansion coefficient of the resin used for the transmissive screen is usually larger than the linear expansion coefficient of the metal support frame. Therefore, when the transmissive screen warps or changes in dimensions due to environmental changes such as temperature or humidity during transportation or warehouse storage, the transmissive screen and the metal support frame that holds the screen expand. In addition, there is a problem in that warping or separation occurs in the transmission screen due to a difference in shrinkage.

  Although the Fresnel lens and lenticular lens are held on the same side with the same adhesive tape, the side surface has a very small area. Therefore, the Fresnel lens and the lenticular lens adhere to each other due to the difference in expansion or contraction between the Fresnel lens and the lenticular lens. There were problems such as tape floating or peeling.

  In the rear projection type image display device described in Patent Document 3, since a gap is formed between the lenticular lens and the Fresnel lens in the outer peripheral portion, the focus is slightly increased or the image is distorted in the peripheral portion of the transmissive screen. There was a problem of doing.

  Therefore, the present invention suppresses the occurrence of warping, bending, or expansion / contraction of the screen due to environmental changes, stably holding the screen, and preventing the occurrence of image defects on the screen. An object is to provide a video display device.

A rear projection type video display device according to the present invention is a rear projection type video display device that projects an image projected from a projection unit from the rear side of a transmissive screen, the transmissive screen comprising a front screen sheet and a rear surface. A screen support member that is configured by overlapping a side screen sheet, a front end side is fixed to an end edge portion of the back side screen sheet, and a cylindrical portion extending in a side direction of the transmission screen is provided on a base end side And a screen support frame that supports the transmission screen via the screen support member, and an edge portion of the back-side screen sheet. And an adhesive for fixing the front end surface on the front end side of the screen support member, and the side surface portion of the back screen sheet An adhesive tape that is pasted across the front side surface portion on the front end side of the clean support member, and straddles the adhesive tape across the rear side surface portion on the front end side of the screen support member from the side surface portion of the front screen sheet. The adhesive sheet is not adhered to the adhesive tape, the back-side screen sheet is fixed to the screen support member by the adhesive tape, and the front-side screen sheet is the adhesive tape. The screen supporting member is fixed to the screen supporting member by the adhesive sheet straddling the screen, and the screen supporting member corresponds to each side portion of the transmissive screen with the cylindrical portion as a rotation axis with respect to the screen supporting frame. It is supported by the cylindrical hole shape portion provided on the receiving portion to be rotatable in each of the transmission screen At a position corresponding to the side portion, a weight support portion for supporting the weight of the screen support member is provided in front of the cylindrical hole shape portion in the screen support frame, and is rotated to the rear of the cylindrical hole shape portion. A restraining portion is provided, and the vertical support range of the upper side portion of the transmission screen is restricted by restricting the pivoting of the screen support member in the vertical direction by the weight support portion and the rotation restraining portion. To do .

  According to the present invention, the adhesive sheet is not bonded to the adhesive tape, the back screen sheet is fixed to the screen support member by the adhesive tape, the front screen sheet is fixed to the screen support member by the adhesive sheet straddling the adhesive tape, The screen support member is supported by a cylindrical hole-shaped portion provided in the accommodating portion so as to be rotatable at each position corresponding to each side portion of the transmissive screen with the cylindrical-shaped portion as a rotation axis with respect to the screen support frame. The

  Therefore, when an environmental change such as temperature or humidity occurs during transportation or warehouse storage, the screen sheet on the back side and the screen sheet on the front side can expand and contract separately. It is suppressed and the occurrence of separation is also suppressed. In addition, in the adhesive tape and adhesive sheet fixing portions to which the respective screen sheets are fixed, the occurrence of the floating and peeling of the adhesive tape and the adhesive sheet can be suppressed.

  Further, since the screen support frame supports the transmission screen through the screen support member so as to be separately rotatable for each side portion, the warp and the deflection of the individual screen sheet are caused by each side portion of the individual screen sheet. Absorbed in.

  As described above, it is possible to stably hold the transmission screen by suppressing warpage, bending, or expansion / contraction of the transmission screen due to the environmental change, and further, the front screen sheet and the rear surface side. Since it is not a structure in which a gap is provided between the screen sheet and the screen, a defective portion of an image is not generated on the transmissive screen.

It is a perspective view which shows schematic structure of the rear projection type video display apparatus which concerns on embodiment. It is a perspective view which shows schematic structure of the multivision which consists of a some rear projection type video display apparatus. It is the S1-S1 sectional view taken on the line of FIG. It is an enlarged view which shows the cross-sectional structure of the transmission type screen holding structure of FIG. FIG. 4 is an enlarged view showing an example of behavior when the environment changes in the cross-sectional configuration of the transmission screen holding structure of FIG. 3. It is the S2-S2 sectional view taken on the line of FIG. It is an enlarged view which shows the cross-sectional structure of the transmission type screen holding structure of FIG. FIG. 7 is an enlarged view showing an example of behavior when the environment changes in the cross-sectional configuration of the transmission screen holding structure of FIG. 6. FIG. 7 is a diagram corresponding to FIG. 6 of a modified example of the embodiment. FIG. 8 is a diagram corresponding to FIG. 7 of a modified example of the embodiment. FIG. 9 is a diagram corresponding to FIG. 8 of a modified example of the embodiment.

<Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of a rear projection type image display apparatus 10 according to the embodiment. As shown in FIG. 1, the rear projection type image display device 10 includes a housing 1, a transmission screen 2, a projection unit 3, a screen support member 4 and a screen support frame 5, and is projected from the projection unit 3. This is a device for projecting an image to be projected from the back of the transmissive screen 2.

  As shown in FIGS. 3 to 5 to be described later, the transmission screen 2 is configured by superposing a lenticular lens 22 (front side screen sheet) and a Fresnel lens 21 (rear side screen sheet). In addition, description of each component of the rear projection type image display apparatus 10 will be described later.

  Next, multivision will be described. FIG. 2 is a perspective view showing a schematic configuration of multivision including a plurality (four) of rear projection type image display devices 10. As shown in FIG. 2, the multi-vision is configured by combining two rear projection image display devices 10 in the vertical direction and two in the horizontal direction, for example. Screen spacing (hereinafter referred to as “joint width”) WA between two rear projection image display devices 10 arranged in the horizontal direction WA, between two rear projection image display devices 10 arranged in the vertical direction In order to make the joint width WB in the vertical direction as small as possible, each casing 1 and each screen support frame 5 has a skeleton formed of a metal frame having a relatively small linear expansion coefficient. Furthermore, each transmissive screen 2 made of resin is manufactured by NC processing to suppress dimensional variations, and has elasticity with respect to the screen support member 4 that holds each transmissive screen 2. As a result, when the environment changes, a resin (for example, acrylic resin) having a relatively large linear expansion coefficient is used for a screen support frame 5 made of metal (for example, aluminum) having a relatively small linear expansion coefficient. The transmission screen 2 is configured to absorb expansion / contraction, warpage, and deflection change.

  Although details will be described later with reference to FIG. 4, the rear projection display 10 further includes an adhesive 13, a single-sided adhesive heat-resistant tape 11 (adhesive tape), and a thermal adhesive resin sheet 12 (adhesive sheet), and has a thickness. The joint width is suppressed by holding the Fresnel lens 21 and the lenticular lens 22 constituting the transmission screen 2 with the 80 μm single-sided adhesive heat-resistant tape 11 and the thermoadhesive resin sheet 12 having a thickness of 110 μm.

  Next, the transmission screen holding structure of the rear projection type image display device 10 will be described. 3 is a cross-sectional view taken along line S1-S1 of FIG. 2, FIG. 4 is an enlarged view showing a cross-sectional configuration of the transmissive screen holding structure of FIG. 3, and FIG. 5 is a transmissive screen holding structure of FIG. It is an enlarged view which shows an example of the behavior at the time of environmental change in the cross-sectional structure of. 6 is a cross-sectional view taken along line S2-S2 of FIG. 2, FIG. 7 is an enlarged view showing a cross-sectional configuration of the transmissive screen holding structure of FIG. 6, and FIG. 8 is a transmissive screen holding structure of FIG. It is an enlarged view which shows an example of the behavior at the time of environmental change in the cross-sectional structure of. 3 to 8 show the projection light 30 that is an image projected from the projection unit 3.

  First, the holding structure of the left side portion and the right side portion of the transmission screen 2 will be described with reference to FIGS. 3 to 5. FIG. 3 is a view showing the holding structure of the left side portion of the transmissive screen 2, but since the right side portion has the same structure, the holding structure of the left side portion of the transmissive screen 2 will be described.

  As shown in FIG. 3, the screen support member 4 includes a cylindrical portion 4c. The front end side of the screen support member 4 is fixed to the edge portion on the back side of the Fresnel lens 21. On the base end side of the screen support member 4, a cylindrical portion 4c extending in the side direction (vertical direction) of the transmission screen is provided.

  The screen support frame 5 includes an outer wall portion 5a, an inner wall portion 5b, a partition portion 5c, a housing portion 5d, a protruding portion 5e, an opening portion 5f, a cylindrical hole-shaped portion 5g, and a concave portion 5h (rotation suppressing portion) recessed backward. I have. The screen support frame 5 is configured by combining an outer wall portion 5a and an inner wall portion 5b, and a housing portion 5d having an opening portion 5f on the distal end side is formed by a partition portion 5c that connects the outer wall portion 5a and the inner wall portion 5b. ing. The accommodating part 5d is a space formed between the outer wall part 5a and the inner wall part 5b.

  The accommodating portion 5d is formed to have a size capable of accommodating the proximal end side of the screen support member 4, and the proximal end side of the screen support member 4 is accommodated in the accommodating portion 5d. The screen support frame 5 supports the transmission screen 2 via the screen support member 4. A cylindrical hole-shaped portion 5g that supports the outer peripheral portion of the cylindrical-shaped portion 4c is provided at a position corresponding to the central portion of the accommodating portion 5d in the outer wall portion 5a and the inner wall portion 5b. The cylindrical portion 4c and the cylindrical hole shape portion 5g are not connected at the entire positions corresponding to the four sides of the transmissive screen 2, and are divided for each position corresponding to each side. The screen support member 4 is a cylindrical hole-shaped portion 5g that is rotatable with respect to the screen support frame 5 at each position corresponding to each side portion of the transmission screen 2 with the cylindrical-shaped portion 4c as a rotation axis. It is supported. Thereby, both the Fresnel lens 21 and the lenticular lens 22 are supported by the screen support frame 5 in a state in which the four side portions can be separately rotated with the cylindrical portion 4c as a rotation axis.

  A protrusion 5e that protrudes toward the screen support member 4 (right side) is provided behind the cylindrical hole-shaped part 5c in the housing part 5d. The protruding portion 5e is formed in an L shape in cross-section so as to connect the outer wall portion 5a and the partition portion 5c, and the rear end of the screen support member 4 is between the protruding portion 5e and the inner wall portion 5b. A concave portion 5h capable of accommodating the portion 4d is formed, and the rear end portion 4d of the screen support member 4 is accommodated in the concave portion 5h. The rear end 4d is accommodated in the recess 5h with a gap left and right, and can move in the left and right in the recess 5h. In other words, the concave portion 5h restricts the movement of the rear end portion 4d in the left-right direction, and thus restricts the movable range of the transmissive screen 2 in the left-right direction.

  Further, since the length of the opening 5f in the left-right direction is larger than the length in the left-right direction on the front side of the base end side of the screen support member 4, the front side of the base end side of the screen support member 4 is It can move left and right.

  As shown in FIGS. 3 and 4, the Fresnel lens 21 is made of an acrylic resin such as polymethyl methacrylate (PMMA) or methyl methacrylate / styrene copolymer (MS). The screen support member 4 is made of the same series of acrylic resin having a linear expansion coefficient equivalent to that of the Fresnel lens 21.

  The single-sided adhesive heat-resistant tape 11 is formed by applying an acrylic pressure-sensitive adhesive on the adhesive side of a polytetrafluoroethylene (PTFE) resin base material having a heat-resistant temperature of 200 ° C. or higher, High adhesiveness with the Fresnel lens 21 made of acrylic resin is ensured. On the contrary, the non-sticking surface side is characterized by non-adhesiveness (non-adhesiveness) and high slipperiness due to the polytetrafluoroethylene (PTFE) base material.

  The Fresnel lens 21 is firmly fixed at the edge portion by the front end portion (front side front end surface) of the screen support member 4 and the adhesive 13, and the side surface portion 21a of the Fresnel lens 21 and the screen are fixed by the single-sided adhesive heat-resistant tape 11. The front side surface portion 4a of the support member 4 is fixed in an auxiliary manner. Thereby, the Fresnel lens 21 and the screen support member 4 are more firmly integrated with redundancy. Here, the adhesive 13 is a solvent-type adhesive.

  Like the Fresnel lens 21, the lenticular lens 22 is made of an acrylic resin such as polymethyl methacrylate (PMMA) or methyl methacrylate / styrene copolymer (MS). The thermoadhesive resin sheet 12 is an epoxy resin impregnated thermosetting type adhesive sheet. The thermal bonding resin sheet 12 includes a front portion and a rear portion, more specifically, a bonding portion 12a provided at a position corresponding to the side surface portion 22a of the lenticular lens 22 and the rear side surface portion 4b of the screen support member 4. I have.

  In the side surface portion 22 a of the lenticular lens 22, the thermoadhesive resin sheet 12 is firmly bonded, and the thermoadhesive resin sheet 12 is firmly attached to the rear side surface portion 4 b of the screen support member 4 so as to straddle the single-sided adhesive heat-resistant tape 11. It is glued. Here, the thermal adhesive resin sheet 12 straddles the single-sided adhesive heat-resistant tape 11, but is not bonded to the single-sided adhesive heat-resistant tape 11. The thermal adhesive resin sheet 12 is heated and pressed at a temperature of 120 ° C. to 150 ° C. for a predetermined time by a heater such as an iron, so that the side surface portion 22a of the lenticular lens 22 that is both acrylic and the rear side of the screen support member 4 The side part 4b is firmly bonded. However, the heat-adhesive resin sheet 12 is not adhered to the single-sided adhesive heat-resistant tape 11 made of polytetrafluoroethylene (PTFE) having high heat resistance, which auxiliaryly fixes the Fresnel lens 21 and the screen support member 4. To ensure slipperiness.

  Next, the holding structure of the upper side portion and the lower side portion of the transmission screen 2 will be described with reference to FIGS. 6 to 8 are diagrams showing the holding structure of the upper side portion of the transmissive screen 2, but the lower side portion has the same structure, and therefore the holding structure of the upper side portion of the transmissive screen 2 will be described. Further, since the holding structure of the upper side portion of the transmissive screen 2 is substantially the same as the holding structure of the left side portion of the transmissive screen 2, only different portions will be described and description of the same portions will be omitted.

  As shown in FIGS. 6 and 7, the cylindrical portion 4 c is formed to extend in the side direction (left-right direction) of the transmissive screen at a position corresponding to the upper side of the transmissive screen 2. Further, a weight support portion 5 i is provided in front of the cylindrical hole-shaped portion 5 c in the screen support frame 5. More specifically, at the position corresponding to the upper side portion of the transmissive screen 2, the length of the front end side of the inner wall portion 5 b of the screen support frame body 5 is longer than the position corresponding to the left side portion of the transmissive screen 2. It is formed long, and the weight support portion 5i is constituted by the tip portion of the inner wall portion 5b. The weight support portion 5 i is provided at a position that can contact the rear side of the front end side of the screen support member 4 in the screen support frame 5, and the weight support portion 5 i extends downward in the screen support member 4. The rotation is restricted, and as a result, the downward movable range of the transmission screen 2 is restricted.

  Further, since the vertical length of the opening 5f is formed larger than the vertical length of the front side of the base end side of the screen support member 4, the front side of the base end side of the screen support member 4 is It can move up and down.

  A protrusion 5e that protrudes toward the screen support member 4 (downward) is provided behind the cylindrical hole-shaped portion 5c in the housing portion 5d. The protruding portion 5e is formed in an L shape in cross-section so as to connect the outer wall portion 5a and the partition portion 5c, and the rear end of the screen support member 4 is between the protruding portion 5e and the inner wall portion 5b. A concave portion 5h capable of accommodating the portion 4d is formed, and the rear end portion 4d of the screen support member 4 is accommodated in the concave portion 5h. The rear end 4d is accommodated in the recess 5h with a gap in the vertical direction, and is movable in the vertical direction in the recess 5h. In other words, the concave portion 5h restricts the movement of the rear end portion 4d in the vertical direction, and thus restricts the movable range of the transmissive screen 2 in the vertical direction.

  Thus, at a position corresponding to the upper side portion of the transmission type screen 2, the screen support member 4 made of acrylic resin includes a weight support portion 5i constituted by the tip portion of the aluminum screen support frame body 5, The weights of the Fresnel lens 21 and the lenticular lens 22 are supported while the vertical position is restricted by the recess 5h. The vertical support range of the upper side portion of the transmissive screen 2 is restricted by restricting the rotation of the screen support member 4 in the vertical direction by the weight support portion 5i and the concave portion 5h.

  In this way, the side surface portion 21a of the Fresnel lens 21 made of acrylic resin and the side surface portion 22a of the lenticular lens 22 are both firmly joined to the screen support member 4 made of acrylic resin, although they are separated from each other. Yes. When an environmental change such as temperature or humidity occurs during transportation or warehouse storage, the Fresnel lens 21, the lenticular lens 22, and the screen support member 4 are arranged on each side of the transmissive screen 2, as shown in FIGS. As shown by the double-headed arrow in FIG. Therefore, partial stress is unlikely to occur in each fixing portion, and the Fresnel lens 21 and the lenticular lens 22 can maintain a strong fixing state.

  Further, as shown in FIGS. 5 and 8, the lenticular lens 22 that is first affected by the outside air rapidly expands when the environmental change such as temperature or humidity during transportation or warehouse storage is changing rapidly. In some cases, a difference in expansion and contraction may occur between the lenticular lens 22 and the Fresnel lens 21. In this case, the thermal adhesive resin sheet 12 is not bonded to the single-sided adhesive heat-resistant tape 11 and has slipperiness, so that the thermal-adhesive resin sheet 12 is smoothly deformed on the single-sided adhesive heat-resistant tape 11, In addition, it extends while sliding in the extending direction of the screen support member 4 and the screen support frame 5 and absorbs the difference in expansion and contraction with the Fresnel lens 21, thereby suppressing sheet peeling and tape peeling. .

  Further, as shown in FIGS. 6 to 8, on the upper side portion of the transmissive screen 2, both the lenticular lens 22 and the Fresnel lens 21 are rotated in the vertical direction by the weight support portion 5i of the screen support frame 5 and the concave portion 5h. It is supported by the screen support member 4 while its movement is restricted. When environmental changes such as temperature or humidity occur during transportation or warehouse storage, the screen support member 4, the thermoadhesive resin sheet 12, and the single-sided adhesive heat-resistant tape mainly at the left and right sides and the lower side of the transmissive screen 2. 11 is generated, and the screen support member 4 rotates about the cylindrical portion 4c as a rotation axis. As a result, the vertical and horizontal expansion and contraction of the lenticular lens 22 and the Fresnel lens 21 are absorbed in the in-plane downward direction and the in-plane left-right direction starting from the upper side of the transmissive screen 2, respectively. In the fixed portion, partial out-of-plane stress is not easily applied.

  In addition, although the side surface portion 21a of the Fresnel lens 21 and the side surface portion 22a of the lenticular lens 22 are adjacent to each other, direct stress is not easily applied from the contact portion between the Fresnel lens 21 and the lenticular lens 22, and therefore the lenticular lens 22 and the Fresnel lens. The change of the 21 partial curvature and bending can be suppressed.

  As described above, in the rear projection type image display device 10 according to the embodiment, the thermal adhesive resin sheet 12 is not bonded to the single-sided adhesive heat-resistant tape 11, and the Fresnel lens 21 is attached to the screen support member 4 by the single-sided adhesive heat-resistant tape 11. The lenticular lens 22 is fixed to the screen support member 4 by a thermoadhesive resin sheet 12 straddling the single-sided adhesive heat-resistant tape 11, and the screen support member 4 rotates the cylindrical portion 4 c with respect to the screen support frame 5. As described above, the cylindrical screen is supported by a cylindrical hole-shaped portion 5g provided in the accommodating portion 5d so as to be rotatable at each position corresponding to each side portion of the transmissive screen 2.

  Accordingly, when an environmental change such as temperature or humidity occurs during transportation or warehouse storage, the Fresnel lens 21 and the lenticular lens 22 can be separately expanded and contracted, so that the Fresnel lens 21 and the lenticular lens 22 are warped and bent. Is suppressed, and the occurrence of separation is also suppressed. Moreover, in the fixing part of the single-sided adhesive heat-resistant tape 11 to which the Fresnel lens 21 is fixed, and the fixing part of the thermal adhesive resin sheet 12 to which the lenticular lens 22 is fixed, the single-sided adhesive heat-resistant tape 11 and the thermal adhesive resin sheet 12 Occurrence of floating and peeling can also be suppressed.

  Further, since the screen support frame 5 supports the transmission screen 2 through the screen support member 4 so as to be separately rotatable for each side portion, each of the Fresnel lens 21 and the lenticular lens 22 is warped and bent. Absorption is performed at each side of each of the Fresnel lens 21 and the lenticular lens 22.

  As described above, the transmissive screen 2 can be stably held by suppressing the warp, bend, or expansion / contraction of the transmissive screen 2 due to environmental changes, and the lenticular lens 22 and Fresnel. Since there is no structure in which a gap is provided between the lens 21 and the transmissive screen 2, an image defect is not generated.

  Further, the conventional rear projection type image display device described in Patent Document 1 has a problem that the machining cost due to NC machining for providing a notch-shaped portion on the outer peripheral end face of the Fresnel lens is high. On the other hand, in the rear projection type image display device 10 according to the embodiment, since it is not necessary to provide a notch-shaped portion on the outer peripheral end surface of the Fresnel lens 21, an increase in machining cost can be suppressed.

  In addition, in the conventional rear projection type image display device described in Patent Document 2, the strength defect is supplemented by adding an urging bracket with a claw for holding the screen to a key point. Since the claw portion of the brace is visible, there is a problem that the claw portion is recognized by the user as a missing portion of the video. Furthermore, in the conventional rear projection type image display device described in Patent Document 2, there is a problem that the surface of the screen is damaged by the contact between the claw portion of the urging bracket and the surface resin sheet of the screen. there were. On the other hand, since the rear projection type image display apparatus 10 according to the embodiment does not use the urging bracket with the claw, these problems do not occur.

  At a position corresponding to the upper side portion of the transmissive screen 2, a weight support portion 5i for supporting the weight of the screen support member 4 is provided in front of the cylindrical hole shape portion 5g in the screen support frame 5, and the cylindrical hole shape portion A concave portion 5h is provided behind 5g, and the vertical support range of the upper side portion of the transmissive screen 2 is increased by restricting the rotation of the screen support member 4 in the vertical direction by the weight support portion 5i and the concave portion 5h. regulate.

  Therefore, when a multi-vision configuration is made using a plurality of rear projection type image display devices 10, the upper sides of the transmission screens 2 at each stage are held at the positions aligned in the vertical direction, resulting in uneven joints. It is difficult to maintain a uniform screen screen.

<Modification>
In addition to the configuration described above, a hollow portion 4e is provided inside the acrylic resin-based screen support member 4 formed by extrusion molding at positions corresponding to the upper side portion and the lower side portion of the transmissive screen 2 to provide a hollow space. A configuration in which the metal leaf spring-like core member 6 is disposed in the portion 4e to enhance the elastic force of the screen support member 4 itself is conceivable. 9 is a diagram corresponding to FIG. 6 of a modification of the embodiment, FIG. 10 is a diagram corresponding to FIG. 7 of the modification of the embodiment, and FIG. 11 is a diagram corresponding to FIG. 8 of the modification of the embodiment. FIG.

  9 to 11 are diagrams showing the holding structure of the upper side portion of the transmissive screen 2, but the lower side portion has the same structure, and therefore the holding structure of the upper side portion of the transmissive screen 2 will be described.

  As shown in FIGS. 9 to 11, the metal leaf spring core 6 is disposed inside the screen support member 4 at a position corresponding to the upper side portion of the transmissive screen 2. The bending elastic force in the vertical direction is strengthened. The bending elastic force of the metal leaf spring core 6 restricts the vertical rotation of the screen support member 4, thereby restricting the vertical movable range of the upper side portion of the transmission screen 2. .

  As described above, in the rear projection image display device 10 according to the modification of the embodiment, a metal leaf spring shape is formed inside the screen support member 4 at a position corresponding to the upper side portion or the lower side portion of the transmissive screen 2. A core member 6 is disposed, and the movable range in the vertical direction of the upper side portion or the lower side portion of the transmission screen 2 is restricted by the bending elastic force of the metal leaf spring-like core member 6.

  Therefore, when an environmental change such as temperature or humidity occurs during transportation or warehouse storage, the screen support member 4 rotates with the bending elastic force of the screen support member 4 and the cylindrical portion 4c as a rotation axis. Expansion and contraction in the vertical direction of the Fresnel lens 21 and the lenticular lens 22 is smoothly absorbed. On the other hand, since the metal leaf spring core 6 is disposed in the hollow portion 4e even when the Fresnel lens 21 and the lenticular lens 22 expand and contract in the left-right direction, the screen support member 4 can be freely moved in the left-right direction. It is possible to follow, and it is possible to further suppress a change in partial warpage or deflection.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

  2 transmission screen, 3 projection unit, 4 screen support member, 4c cylindrical shape part, 5 screen support frame, 5d accommodating part, 5g cylindrical hole shape part, 5h recess, 5i weight support part, 6 metal leaf spring core Materials, 10 Rear projection type image display device, 11 Single-sided adhesive heat-resistant tape, 12 Thermal adhesive resin sheet, 13 Adhesive, 21 Fresnel lens, 22 Lenticular lens.

Claims (2)

A rear projection type image display device for projecting an image projected from a projection unit from the rear side of a transmissive screen,
The transmission screen is configured by superimposing a front screen sheet and a back screen sheet,
A screen support member in which a distal end side is fixed to an end edge portion of the back-side screen sheet, and a cylindrical portion extending in a side direction of the transmission screen is provided on a proximal end side;
A screen support frame that has a housing portion that houses a base end side of the screen support member, and supports the transmission screen via the screen support member;
An adhesive for fixing the edge of the back-side screen sheet and the front end surface on the front end side of the screen support member;
An adhesive tape that is pasted from the side surface portion of the back side screen sheet to the front side surface portion of the front end side of the screen support member;
An adhesive sheet that is pasted so as to straddle the adhesive tape across the side surface portion of the front side screen sheet and the rear side surface portion on the front end side of the screen support member;
With
The adhesive sheet is not adhered to the adhesive tape, the back-side screen sheet is fixed to the screen support member by the adhesive tape, and the front-side screen sheet is attached to the screen support member by the adhesive sheet straddling the adhesive tape. Fixed,
The screen support member is a cylindrical hole provided in the accommodating portion so as to be rotatable at each position corresponding to each side portion of the transmissive screen with the cylindrical portion as a rotation axis with respect to the screen support frame. Supported by the shape part ,
A weight support portion for supporting the weight of the screen support member is provided in front of the cylindrical hole shape portion in the screen support frame at a position corresponding to the upper side portion of the transmission type screen, and the cylindrical hole shape portion A rotation restraining portion is provided behind the
The rear projection type image that restricts the movable range in the vertical direction of the upper side portion of the transmissive screen by restricting the vertical rotation of the screen support member by the weight support portion and the rotation restraining portion. Display device. A rear projection type image display device for projecting an image projected from a projection unit from the rear side of a transmissive screen,
The transmission screen is configured by superimposing a front screen sheet and a back screen sheet,
A screen support member in which a distal end side is fixed to an end edge portion of the back-side screen sheet, and a cylindrical portion extending in a side direction of the transmission screen is provided on a proximal end side;
A screen support frame that has a housing portion that houses a base end side of the screen support member, and supports the transmission screen via the screen support member;
An adhesive for fixing the edge of the back-side screen sheet and the front end surface on the front end side of the screen support member;
An adhesive tape that is pasted from the side surface portion of the back side screen sheet to the front side surface portion of the front end side of the screen support member;
An adhesive sheet that is pasted so as to straddle the adhesive tape across the side surface portion of the front side screen sheet and the rear side surface portion on the front end side of the screen support member;
With
The adhesive sheet is not adhered to the adhesive tape, the back-side screen sheet is fixed to the screen support member by the adhesive tape, and the front-side screen sheet is attached to the screen support member by the adhesive sheet straddling the adhesive tape. Fixed,
The screen support member is a cylindrical hole provided in the accommodating portion so as to be rotatable at each position corresponding to each side portion of the transmissive screen with the cylindrical portion as a rotation axis with respect to the screen support frame. Supported by the shape part,
In a position corresponding to the upper side or the lower side of the transmissive screen, a leaf spring core is disposed inside the screen support member,
Regulating the vertical movable range of the upper side portion or bottom portion of the transmission type screen by the elastic force of the plate spring-like core member, rear projection type image display apparatus.

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