JP2007127950A - Rear type projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an adhesive from entering between a lenticular screen and a Fresnel lens screen in the case where the adhesive is used as a fixing member in order to enhance the reliability of a screen holding structure. <P>SOLUTION: The lenticular screen 311 and Fresnel lens screen 312 are superposed such that projections 331, each of which is made of a T-shaped rod 33 having a T-shaped cross-section, are interposed between the screens 311 and 312. The adhesive 34 is applied to the end faces 313 and 314 of a screen member 31 formed from the lenticular screen and Fresnel lens screen superposed one on other, a rear face 332 of the T-shaped rod, and the peripheral faces 322 of a screen support member 32. An elastic band-like member 35 is stuck to them via the adhesive. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multi-vision type rear projection system in which a large screen is configured by combining a plurality of rear (rear type) projector apparatuses each having a plurality of transmission type screens vertically and horizontally, and in particular, a gap generated between adjacent rear projector apparatuses. The present invention relates to a screen support structure capable of reducing (joint width).

  In recent years, a rear projector device has attracted attention as a large-screen video display device. The rear projector device has a screen member and a projection device on which a Fresnel lens screen and a lenticular screen are superimposed, and projects images and characters projected by the projection device onto the back surface of the screen member, and images from the front surface of the screen member. Is a display device.

  Further, a multi-vision type rear projection system is widely used in which a plurality of rear projector devices are arranged in rows and columns to form a single large screen with screen members arranged in a matrix and used as a single large display. In the multi-vision type rear projection system, a gap (hereinafter referred to as a joint) is generated between the screen members of the rear projector devices adjacent to each other in the vertical and horizontal directions, and this appears as a lattice-like video missing portion in a large screen image. The video quality will be degraded. Therefore, the joint width between the screen members is reduced as much as possible. For example, there is a technique disclosed in Patent Document 1 below.

  FIG. 6 shows the appearance and basic configuration of one rear projector apparatus 2. The rear projector device 2 is roughly divided into a screen frame portion 3 and a projector device body 4. The screen frame section 3 includes a screen member 31 composed of a plurality of translucent screens and a screen support member 32 (see FIG. 7), and the projector apparatus body 4 includes a projection apparatus 43 that projects an image, and a projection apparatus 43 It has a plane mirror 44 that folds the transmitted image and projects it onto the back surface of the screen member 31.

FIG. 7 is a diagram showing an outline of a side cross-section of the rear projector device 2 disclosed in Patent Document 1, and is a cross-sectional view in the AA direction of FIG. The screen member 31 is configured by overlapping a lenticular screen 311 and a Fresnel lens screen 312 and the like, and is overlapped so that the back surface of the screen member 31 and the tip of the screen support member 32 are in contact with each other. A single-sided adhesive tape 36 is affixed to the end face of the screen member 31 and the outer peripheral surface of the screen support member 32 in an overlapped state, and the screen member 31 and the screen support member 32 are connected to each other. In Patent Document 1, a single-sided adhesive tape 36 having a small thickness is used as a connecting means between the screen member 31 and the screen support member 32 in order to reduce the joints on the outer edge of the screen as much as possible.
JP 2000-162709 A (Abstract)

  However, with the above configuration, the purpose of reducing the joint width can be achieved, but the end surface of the screen member 31 that has a large shape and is bent is fixed to the outer peripheral surface of the screen support member 32 by the single-sided adhesive tape 36. Therefore, the single-sided adhesive tape 36 is easily peeled off, and there is a problem that the holding strength of the screen member 31 is not reliable.

  In view of this, it is possible to use a structure that uses an adhesive, which is a sticking means that has significantly higher adhesive strength than the single-sided adhesive tape 36, to increase the holding strength. FIG. 8 shows the conceivable structure, in which a band-shaped member 35 (for example, nylon tape) is bonded by an adhesive 34 at the connecting portion between the screen member 31 and the screen support member 32 instead of the single-sided adhesive tape 36. In other words, the adhesive 34 is applied to the end surface of the screen member 31 and the outer peripheral surface of the frame-shaped screen support member 32, and the band-shaped member 35 is bonded to the end surface of the screen member 31 through the adhesive 34. The outer peripheral surface of 32 is surface-coupled to the belt-like member 35, and the screen member 31 and the screen support member 32 are connected. In this configuration, by using the adhesive 34 which is a stronger adhesive means compared to the single-sided adhesive tape, the holding force of the screen member 31 is large while keeping the joint width of the outer edge of the screen member 31 small. It is possible to realize a screen holding structure and to provide a highly reliable rear projector device 2.

  However, in the screen holding structure using the adhesive 34, the adhesive 34 applied to the end surface of the screen member 31 may penetrate between the lenticular screen 311 and the Fresnel lens screen 312. The soaked part may block the projection light on the screen member 31 or blur the projected image, leading to deterioration of the quality of the projected image.

  Accordingly, the present invention provides a rear-type projector apparatus having a structure capable of preventing the penetration of the adhesive between the lenticular screen and the Fresnel lens screen when the adhesive is used as a fixing member for the purpose of improving the reliability of the screen holding structure. The purpose is to provide.

In order to achieve the above-mentioned object, the present invention provides a large-sized two-dimensional array of a plurality of structures in which a screen member in which a Fresnel lens screen and a lenticular screen are superimposed and a screen support member that supports the screen member are connected. In the rear type projector device constituting the screen,
A T-shaped member inserted between end faces of the Fresnel lens screen and the lenticular screen;
The Fresnel lens screen and the lenticular screen, which are superposed and bonded by the T-shaped member, are housed in the screen support member and fixed by bonding, thereby making a large screen connected with the screen support member homogeneous. It is characterized by forming in.

  According to the screen support structure of the present invention, when an adhesive having an adhesive strength superior to that of the pressure-sensitive adhesive tape is used for connecting the screen member and the screen support member, the lenticular screen and the Fresnel lens are formed by a member having a T-shaped side section. The holding strength of the screen member can be increased without causing the adhesive to penetrate between the screens. By adopting this structure, a highly reliable rear projector apparatus can be realized without deteriorating the quality of the projected image on the screen. In the multi-vision type rear projection system combined with this rear projector device, it is possible to provide a large screen image with a small joint width and high unity.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a multi-vision type rear projection system 1 according to the present invention. As shown in FIG. 1, the multi-vision type rear projection system 1 includes four rear projector devices 2 (2a, 2b, 2c, 2d) according to the embodiment of the present invention arranged vertically and horizontally. The screen member 31 (31a, 31b, 31c, 31d) is regarded as one large screen to realize a large-sized video display system.

  Here, a gap (joint) 21a between the screen members 31a and 31b adjacent in the vertical and horizontal directions, a joint 21b between the screen members 31a and 31c, a joint 21c between the screen members 31b and 31d, and a joint 21d between the screen members 31c and 31d. Is displayed as a missing image, the width of the joints 21a to 21d is preferably as small as possible. In FIG. 1, the multi-vision type rear projection system 1 is composed of 2 × 2 4 surfaces, but the screen members 31 are adjacent to each other, for example, in the case of 3 × 2 6 surfaces and 3 × 3 9 surfaces. Thus, the present invention can be applied even when a plurality of rear projector apparatuses 2 are arranged.

  FIG. 2 is a diagram showing an outline of the appearance and basic structure of each rear projector apparatus 2. The rear projector device 2 is roughly divided into a screen frame portion 3 and a projector device body 4. The screen frame portion 3 is composed of a screen member 31, a screen support member 32, and a means (not shown but will be described later) for connecting both, and has a structure that fits into the screen frame receiving portion 41 of the projector apparatus body 4. . The projector device main body 4 has its outer dimensions and shapes set so that the screen members 31 are adjacent to each other when the plurality of rear projector devices 2 are stacked in the vertical direction or arranged in the horizontal direction. Yes.

  FIG. 3 is a side cross-sectional view of each rear projector apparatus 2, and is a view showing a cross section AA in FIG. The projector device body 4 includes a housing part 42, a projection device 43, and a flat mirror 44, and the projection device 43 and the flat mirror 44 are fixed inside the housing part 42. The projection image projected by the projection device 43 first enters the plane mirror 44. The projected image reflected by the plane mirror 44 passes through the inside of the screen frame receiving portion 41 that is an opening surface and is projected onto the back surface of the screen member 31. Although the flat mirror 44 is used in this embodiment, the present invention can also be applied to the case where an aspherical mirror is used for the purpose of reducing the depth dimension of the rear projector device 2.

  The screen member 31 is composed of a translucent lenticular lens screen 311 and a Fresnel lens screen 312 (see FIG. 4) formed of PMMA (polymethyl methacrylate) resin, and the external dimensions of both screens are the same. The projected image reflected by the plane mirror 44 is projected on the back surface of the Fresnel lens screen 312, diffused and transmitted in the order of the Fresnel lens screen 312 and the lenticular lens 311, and sent to the front surface of the screen member 31.

  FIG. 4 is a perspective view showing a schematic configuration of the screen frame portion 3. The screen support member 32 that supports the screen member 31 is a frame whose outer shape is substantially the same size as the screen member 31, and has a predetermined thickness in the depth direction. The lenticular screen 311 and the Fresnel lens screen 312 are overlapped with the protruding portion 331 of the T-shaped bar member 33 having a T-shaped cross section sandwiched therebetween, and the back surface of the Fresnel lens screen 312 and the end surface 321 of the screen support member 32 are in contact with each other. Are arranged as follows. The screen member 31 and the screen support member 32, which are overlapped so that their outer peripheries are aligned, are connected by winding and bonding a belt-like member 35 (see FIG. 5) having stretchability around the outer periphery.

  FIG. 5 is a cross-sectional view of a state in which the screen member 31 and the screen support member 32 are connected on the outer periphery thereof, and corresponds to a detailed view of a portion B in FIG. The lenticular screen 311 and the Fresnel lens screen 312 in a state of sandwiching the protruding portion 331 of the T-shaped bar 33 are overlapped with the screen support member 32 so that the outer periphery is aligned. At this time, the end surface 321 of the screen support member 32 is in contact with the back surface of the Fresnel lens screen 312. The adhesive 34 is applied to the end faces 313 and 314 of the screen member 31, the back surface 332 of the T-shaped bar 33, and the outer peripheral surface 322 of the screen support member 32. The belt-shaped member 35 which has is bonded together. In the present embodiment, an epoxy adhesive having elasticity is used as the adhesive 34. When the adhesive 34 is cured, an adhesive layer is formed, whereby the end surfaces 313 and 314 of the screen member 31, the back surface 332 of the T-shaped bar 33, and the outer peripheral surface 322 of the screen support member 32 are joined to the belt-shaped member 35. To do. As a result, the screen member 31 and the screen support member 32 are connected via the belt-like member 35. In the present embodiment, a tape made of nylon is used as the belt-like member 35 having elasticity, so that the level difference caused by the end surfaces 313 and 314 of the screen member 31 and the back surface 332 of the T-shaped bar 33 is absorbed. Further, the nylon tape has an anchor effect for the epoxy adhesive having elasticity, and increases the holding force of the adhesive 34.

1 is an external perspective view showing a multi-vision type rear projection system according to the present invention. It is a figure which shows the external appearance and basic structure of each rear projector apparatus of FIG. It is side surface sectional drawing of the rear projector apparatus of FIG. It is a perspective view which shows the structure outline of the screen frame part of FIG. It is sectional drawing which shows the screen holding structure of embodiment of this invention in detail. It is a figure which shows the external appearance and basic composition of each rear projector apparatus. It is sectional drawing and the partial detail drawing which show the conventional screen holding structure of a multivision type | mold rear projector apparatus. It is sectional drawing and the partial detail drawing which show the other conventional screen holding structure of a multivision type | mold rear projector apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multivision type rear projection system 2, 2a, 2b, 2c, 2d Rear projector apparatus 3 Screen frame part 4 Projector apparatus main body 21a, 21b, 21c, 21d Joint 31, 31a, 31b, 31c, 31d Screen member 32 Screen support member 33 T-shaped bar material 34 Adhesive 35 Band-shaped member 36 Single-sided adhesive tape 41 Screen frame receiving part 42 Housing part 43 Projector 44 Flat mirror 311 Lenticular screen 312 Fresnel lens screen 313, 314 Screen member end surface 321 Screen support member end surface 322 Screen support member outer peripheral surface 331 T-shaped bar protrusion 332 T-shaped bar back

Claims (1)

In a rear-type projector that forms a large screen by arranging a plurality of structures in which a screen member in which a Fresnel lens screen and a lenticular screen are overlapped and a screen support member that supports the screen member are two-dimensionally arranged,
A T-shaped member inserted between end faces of the Fresnel lens screen and the lenticular screen;
The Fresnel lens screen and the lenticular screen, which are superposed and bonded by the T-shaped member, are housed in the screen support member and fixed by bonding, thereby making a large screen connected with the screen support member homogeneous. A rear-type projector device characterized by being formed into a

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