JP2002023270A - Screen-holding structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that conventionally projection surface fames become a thick black line in a grid shape on a screen and makes the screen hard to see at operation, when constituting the multi-vision device of a large screen by piling up a plurality of the projection units of a back projection type in a matrix form of many rows and many columns, when the joint width of the frame for holding the screen of the units in thick. SOLUTION: A transmission screen member 8 is supported by the supporting means of a screen frame body 6 and an elastic member 7, and a transparent film 10, provided with an adhesive layer 10a, is adhered so as to cover the projection surface 8f of a lenticular 8a. Furthermore, the bent part is stuck to the supporting means, and the screen member 8 is held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen holding structure for a rear projection type projection unit, and more particularly to a screen holding structure for a rear projection type projection unit suitable for use in a multi-vision apparatus comprising a plurality of projection units. .

[0002]

2. Description of the Related Art FIG. 3 is a partial sectional view of a screen portion of a conventional rear projection type projection unit 50. As shown in FIG. In the figure, the transmissive screen member 52 is held in a state where its peripheral portion is fitted into a groove 53 formed around the front end opening of the cabinet body 51. The groove 53 is constituted by a screen holding bar 54 whose front end wall can be inserted into and removed from the cabinet main body 51 in the entire periphery or in a predetermined range.

In order to mount the screen member 52 in the groove 53 having such a configuration as shown in FIG. 3, first, the screen holding bar 54 is pulled out from the cabinet body 51, and the screen holding bar 54 is removed. The screen member 52 is set at a predetermined position 53. Then, with the screen member 52 kept in the installation position, the screen holding bar 54 is inserted into the cabinet body 51 and the groove 53 is inserted.
Is completed, the mounting of the screen member 52 is completed.

The transmission screen member 52 is made of an acrylic resin material. For example, when the width of the screen member 52 is 900 mm, it is -40.degree. C. to + 40.degree.
There is an expansion and contraction of about 2.5 mm in the width direction with respect to the temperature change, and further expansion and contraction of about 3.5 mm when a humidity of 80% is added.

In order to cover these expansion and contraction, a predetermined gap 56 is formed in the groove 53 with the screen member 3 mounted.
Is considered to be formed. For this reason, the joint width D of the screen frame 55 from the outer periphery of the cabinet main body 51 to the tip of the regulating portion 54a of the screen holding bar 54 is D =
The thickness of the tip end of the cabinet body 51 + the thickness of the screen holding bar 54 + the height of the regulating portion 54a (= depth of the groove) + the processing error. In the above-described example of dimensions, the joint width D is about 5 mm. Required.

[0006]

As described above, in the above-mentioned conventional rear projection type projection unit 50, there is a possibility that the restricting portion 54a of the screen holding bar 54 covers the projection area of the projection surface of the screen member 3. there were. Further, since the screen member 3 is only inserted into the groove 53, there is a possibility that the screen member 3 may come off due to a temperature change or an external force.

Further, as shown in FIG. 4, when a plurality of rear projection type projection units 50 are stacked in a matrix of multiple rows and multiple columns to constitute a large-screen multi-vision device 60, each screen of adjacent units is formed. The frame 55 (FIG. 3) forms a grid-like boundary portion 61 where no image is displayed. The width of the boundary portion 61 is twice the joint width D, that is, 10 mm in the above-described example of dimensions, and when the multi-vision device is operating, a thick black line appears on the screen, making it difficult to see the screen.

An object of the present invention is to provide a screen holding structure of a rear projection type projection unit suitable for use in a multi-vision device by firmly holding a screen member and reducing a joint width of a screen frame. is there.

[0009]

According to the present invention, there is provided a screen holding structure for a rear projection type projection unit for projecting an output image output from a projection unit onto a transmission type screen member, wherein the cabinet body for outputting the output image is provided. Support means disposed on the front side of the screen member for supporting the transmission screen member, a protection surface portion adhered to the projection surface of the transmission screen member via an adhesive layer, and bending at an outer periphery of the transmission screen member. And a transparent film having a possible bent portion, wherein the bent portion is attached to the support means via an adhesive layer, and the screen member attached to the protective surface portion is fixed to the support means.

The screen member is composed of a Fresnel lens and a lenticular, and the support means is composed of a screen frame fixed to the cabinet and an elastic member mounted on the screen frame. The elastic member and the screen frame may be integrally fixed by an adhesive term wound around each peripheral surface. Further, the transparent film may be a polyester film having an anti-reflection coating for external light or a matte process.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a cross-sectional view of a main part showing a main configuration of a rear projection type projection unit 1 according to a first embodiment of the present invention. However, a transparent film 10 and a lenticular 8a described later are partially developed in order to make the description clear.

In the figure, a rectangular parallelepiped cabinet body 2 is shown.
Holds a projection unit 3 at a predetermined position inside, and projects an output image 4 output from the projection unit 3 onto a screen via an opening 2a formed in a front surface 2b. The screen frame 6 has an outer peripheral surface 6b flush with the outer peripheral surface of the cabinet main body 2, and a flange 6c abutting on the front surface 2b of the cabinet main body 2 where the opening 2a is formed. It is screwed to the cabinet body 2.

The elastic member 7 is fitted so that the outer peripheral surface 7a has an outer shape flush with the outer peripheral surface 6b of the screen frame 6, and the inner wall 7b is joined to the stepped end 6a of the screen frame 6. Are fitted together. The front end surface 7c of the elastic member 7 is provided on the light incident surface 8 of the Fresnel lens 8b which forms the transmission screen member 8 together with the lenticular 8a described later.
g is in contact with the entire periphery. This Fresnel lens 8b
Has an outer peripheral surface 8c which is flush with the outer peripheral surface 7a of the elastic member 7 at room temperature. The screen frame 6 and the elastic member 7 correspond to support means for supporting the transmission screen member.

The adhesive tape 5 has a width capable of covering the entire outer peripheral surfaces of the Fresnel lens 8b and the elastic member 7 and a part of the outer peripheral surface of the screen frame 6, and is wound around these outer peripheral surfaces. , The Fresnel lens 8b, the elastic member 7, and the screen frame 6 are integrally adhered and fixed.

The elastic member 7 has a coefficient of linear expansion substantially equal to that of the screen frame 6, and has a thickness that does not hinder the optical path of the output image 4. Adhesive tape 5
Are colored to prevent light leakage from the peripheral surface of the Fresnel lens 8b.

FIG. 2A is a view showing the shapes of the transparent film 10 on which the adhesive layer 10a is formed and the lenticulars 8a constituting the transmission screen member 8, as viewed from the direction of arrow A in FIG. . As shown in the figure, the lenticular 8a has a rectangular outer shape substantially the same size as the Fresnel lens 8b, and the transparent film 10 is adhered so as to cover the projection surface 8f of the lenticular 8a indicated by oblique lines. It comprises a surface portion 10b and bent portions 10c to 10f of a predetermined width W which are bent and bonded as described later.

In the present embodiment, the transparent film 10 is made of polyester and has a thickness of 10 mm, the surface of which is coated with an anti-reflection coating or a mat.
A film having a thickness of about 50 μm to 50 μm is used.

As shown in FIG. 2B, the transparent film 10 and the lenticular 8a, which are shown in a developed state in FIG. 1, are brought into close contact with each other through an adhesive layer 10a as shown in FIG. 8d (FIG. 1) is Fresnel lens 8b
In contact with the light emitting surface 8e (FIG. 1) of the transparent film 10 in this state.
Is bent and adhered to the outer peripheral surface of the adhesive tape 5.
As a result, the lenticular 8a is integrated with the Fresnel lens 8b, and is fixed to the support member including the elastic member 7 and the screen frame 6. The predetermined width W of each bent portion is set to such a width that the fixing at this time can be firmly performed.

According to the screen holding structure of the first embodiment as described above, the screen member 8 can be held firmly and the joint width D on the outer periphery of the screen can be reduced.

[0020]

According to the holding structure of the first aspect of the present invention,
Since the joint width of the projection surface frame of the screen member is approximately the thickness of the transparent film (10 μm to 50 μm in the above-described embodiment), the rear projection type projection unit employing this holding structure is formed in a matrix of multiple rows and multiple columns. When configuring a large-screen multi-vision device by stacking multiple devices,
When the multi-vision device is operated, the projection surface frame becomes a grid-like thick black line on the screen, and does not obscure the screen.

According to the holding structure of the second aspect of the present invention, since the screen member is held in the cabinet via the elastic member, even if the screen member expands and contracts due to changes in temperature and humidity, the elastic member expands and contracts. To absorb the minute,
A situation in which the screen member comes off the holding means can be prevented.

According to the holding structure of the third aspect of the present invention, since the transparent film is subjected to the anti-reflection coating for external light, it is possible to prevent the screen from being difficult to see due to light reflection. In addition, since polyester having a small moisture absorption is used for the film material, shrinkage due to moisture absorption of the screen material can be suppressed.

[0023]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a main configuration of a rear projection type projection unit 1 according to a first embodiment of the present invention.

2A is a view showing the shapes of a transparent film 10 and a lenticular 8a when viewed from the direction of arrow A in FIG. 1, and FIG. 2B is a view showing each bent portion 10c of the transparent film 10.
10f is a cross-sectional view of a main part showing a state where the adhesive tape 5 is bent and attached to the outer peripheral surface of the adhesive tape 5. FIG.

FIG. 3 is a partial cross-sectional view showing a configuration of a screen portion of a conventional rear projection type projection unit.

FIG. 4 is a perspective view of a large-screen multi-vision device in which a plurality of rear projection type projection units 50 are stacked in a matrix of multiple rows and multiple columns.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 rear projection type projection unit, 2 cabinet body, 2 a opening, 2 b front, 3 projection unit, 4 output image, 5 adhesive tape 6 screen frame, 6 a step, 6 b outer surface, 6 c flange, 7 elastic member, 7 a Outer peripheral surface, 7b inner wall portion, 7c tip surface, 8 transmissive screen member,
8a lenticular, 8b Fresnel lens, 8c
Outer peripheral surface, 8d light incident surface, 8e light emitting surface, 8f
Projection surface, 8g Light incident surface, 10 transparent film, 1
0a adhesive layer, 10b protective surface.

Claims (3)

[Claims] 1. A screen holding structure of a rear projection type projection unit for projecting an output image output from a projection unit onto a transmission type screen member, wherein the screen holding structure is provided on a front side of the cabinet main body for outputting the output image. Support means for supporting the transmission type screen member through a protective surface portion adhered to the projection surface of the transmission type screen member via an adhesive layer, and a bending portion which can be bent at the outer periphery of the transmission type screen member. A screen holding structure, comprising: a transparent film, wherein the bent portion is attached to the support means via an adhesive layer, and the screen member attached to the protective surface is fixed to the support means. 2. The fresnel lens, wherein the screen member comprises a Fresnel lens and a lenticular, and the support means comprises a screen frame fixed to the cabinet and an elastic member mounted on the screen frame. 2. The screen holding structure according to claim 1, wherein said elastic member, and said screen frame are integrally fixed by an adhesive term wound around each peripheral surface. 3. The screen holding structure according to claim 1, wherein the transparent film is made of a polyester film having an anti-reflection coating or a matte finish.