JPH10282580A - Fixing device for transmission type screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a fixing means from being exposed at the peripheral part of a transmission type screen and to form an optical image on an entire surface by covering the transmission type screen with a transparent sheet from a front surface side and fixing the peripheral part of the transparent sheet to a fixed frame. SOLUTION: The transparent sheet 16 is made larger than the transmission type screen 15, and four sides of the peripheral part 20 are bent, and also are fixed to the fixed frame 14 through a wire 21. The transmission type screen 15 is fixed to the fixed frame 14 by the tension of the transparent sheet 16. Thus, an entire transmission type screen 15 is covered with the transparent sheet 16 from the front surface side of the transmission type screen 15, and the transmission type screen 15 is fixed to the fixed frame 14 by the tension of the transparent sheet 16, so that the transmission type screen 15 is fixed. As the material of the transparent sheet 16, a material selected from a transparent high polymer material such as polyethylene terephthalate, polyethylene or the like is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for a transmission screen, and more particularly to a fixing device for fixing a transmission screen to a fixing frame.

[0002]

2. Description of the Related Art A rear projector projects an image formed on a screen surface thereof by a CRT (cathode ray tube) disposed in a cabinet from a rear side to a transmission screen mounted on a front side of the cabinet by a lens. Or 2. An LCD projector is used as an image source to project light from a rear side onto a transmission screen similarly mounted on the front side of the cabinet, so that a light image is formed on the transmission screen.

FIG. 4 shows a fixing structure of a transmission screen 1 of a conventional rear projector. The transmission screen 1 is mounted on the front side of the cabinet 2 via the scream frames 3 and 4 so as to close the opening on the front side of the cabinet 2. Here, the screen frames 3 and 4 have bent pieces 5 and 6
The bent portions 5 and 6 hold the periphery of the transmission screen 1 so as to be sandwiched between the inside and the outside.

[0004]

In order to prevent the bent pieces 5 of the screen frame 3 from being conspicuous at the peripheral edge of the transmission screen 1, the screen frames 3, 4 made of a thin material such as a sheet metal are conventionally used. The periphery of the mold screen 1 was fixed.

[0005] Such a fixed structure has a possibility that the transmissive screen 1 may come off when the transmissive screen 1 itself expands due to a temperature change, particularly when the size of the bent pieces 5 of the screen frame 3 is small. There is. For this reason, the size of the transmissive screen 1 is limited, and the size is usually suppressed to 40 inches or less.

[0006] When the margin of the bent piece 5 of the screen frame 3 is reduced, the transmission screen 1 is more easily detached. Further, when the transmissive screen 1 faces downward, a load is applied to the bent piece 5, and thus there is a problem that the attitude of the projector is limited. For this reason, there is a disadvantage that it is very difficult to make the screen frame 3 inconspicuous at the periphery of the transmission screen 1.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a fixing device is not exposed at a peripheral portion of a transmissive screen, and a transmissive image forming apparatus can form an optical image on the entire surface. It is an object to provide a screen fixing device.

[0008]

According to the present invention, there is provided a fixing device for fixing a transmission type screen to a fixing frame, wherein a transparent sheet is placed on the transmission type screen from the front side thereof and a peripheral portion of the transparent sheet is fixed. The present invention relates to a transmission screen fixing device characterized by being fixed to a frame.

[0009] The transparent sheet may be made of a transparent polymer material, and an anti-reflection coating may be applied to an outer surface on a front side thereof. The transparent sheet may be fixed to the fixed frame in a state where tension is applied by a wire mounted on an outer peripheral portion of the fixed frame.

[0010] A projecting piece may be connected to a lower edge portion of the fixed frame so as to project toward the front side, and the projecting piece may receive a lower end surface of the transmission screen. Further, a fixed frame to which the transmissive screen is fixed may be detachably connected to the cabinet.

The transmission screen may be suitably used as a screen of a rear projector.

[0012]

1 and 2 show a rear projector having a transmissive screen fixing device according to an embodiment of the present invention. This rear projector includes a rectangular parallelepiped cabinet 10. The cabinet 10 has an opening on the front side. A transmissive screen 15 is mounted on such a portion of the opening 11 while being fixed to the fixed frame 14.

The transmission screen 15 according to the present embodiment.
Has a great feature in using the transparent sheet 16. The transparent sheet 16 is one size larger than the transmissive screen 15 and bends the four peripheral edges 20 and is fixed to the fixed frame 14 via the wires 21, and the transparent sheet 16 is transmitted by the tension of the transparent sheet 16. The mold screen 15 is fixed to the fixed frame 14. As shown in FIG. 2, a projecting piece 22 protruding toward the front side is provided at a lower end portion of the fixed frame 14, and the projecting piece 22 receives the lower end face of the transmissive screen 15. ing.

As shown in FIG. 2, the fixed frame 14
A rib 26 is formed on the inner peripheral portion so as to project inward, and this rib 26 is
A peripheral wall 27 provided on the periphery of the first unit 27 is connected and fixed by screws 28. That is, the transmission screen 15 is detachably connected to the cabinet 10.

As described above, the method for fixing the transmissive screen of the rear projector according to the present embodiment uses the screen 1
The transmission screen 15 is entirely covered with a transparent sheet 16 from the front side of the transmission screen 5, and the transmission screen 15 is fixed to the fixed frame 14 by the tension of the transparent sheet 16, thereby fixing the transmission screen 15. is there.

The material of the transparent sheet 16 used to fix the transmission screen 15 is polyethylene terephthalate (PET), polyethylene (P).
E), polyvinyl chloride (PVC), polyurethane (P
Any material selected from transparent polymer materials such as U) may be used. Further, such a transparent sheet 16 is provided with an anti-reflection coating on the front side thereof, that is, on the surface opposite to the surface in contact with the transmissive screen 15, so that such coating reduces the contrast due to external light. The accompanying deterioration of image quality is prevented. The anti-reflection coating may be composed of, for example, a magnesium fluoride vapor-deposited film.

When the transparent sheet 16 is fixed to the transmission screen 15, its peripheral edge 20 is
To bend so as to cover the side edges of. In addition, in order to prevent wrinkles from being generated on the surface of the transparent sheet 16, the wire 21 provided on the outer periphery of the fixed frame 14 is used over the entire circumference, and the elasticity of the transparent sheet 16 is used to apply the wire 21 The fixing is performed under tension. As a result, the surface of the transparent sheet 16 does not wrinkle, and the transparent sheet 16 does not adhere to the transmission screen 15.

Instead of using the wires 21 in order to prevent the transparent sheet 16 from wrinkling, the transparent sheet 16 is previously heated and covered on the transmission type screen 15, so that the transparent sheet 16 is adapted to the transmission type screen 15. The tension may be applied by utilizing the shrinkage of the transparent sheet 16 when the screen 15 is cooled. When such a method is employed, the fixing of the peripheral portion 20 of the transparent sheet 16 to the fixing frame 14 may be performed by mechanical fixing such as screwing or by using an adhesive.

Such a rear projector has a fixed frame 14 to which the transmissive screen 15 is fixed by the transparent sheet 16 and a cabinet so that the transparent sheet 16 can be easily attached to and detached from the fixed frame 14. 10 and a separate member, and these are detachably connected by screws 28. That is, the transmission screen 15 and the fixed frame 1
4 and the cabinet 10 as an integrated unit.
And a structure that is independent of. The rib 26 of the fixed frame 14 is detachably connected to the peripheral wall 27 of the opening 11 of the cabinet 10 by screws 28.

In order to hold the load of the transmission screen 15, it is preferable to provide a screen receiver on the fixed frame 14. That is, as shown in FIG. 2, in order to prevent the transparent sheet 16 from bending due to the load of the transmission screen 15, a projection 22 is provided below the fixed frame 14 so as to receive the lower end surface of the transmission screen 15,
The transparent sheet 16 may be mounted from the front side with the transmissive screen 15 mounted thereon.

The fixing device for the transmission screen according to the present embodiment prevents the screen frame from being exposed at the peripheral portion of the transmission screen 15 and makes the entire surface of the transmission screen 15 a display surface on which an optical image is formed. It becomes possible. Further, by performing anti-reflection processing on the outer surface of the transparent sheet 16, reflection of external light can be prevented, and a high-quality image can be formed. In addition, since the thermal expansion of the transmission screen 15 can be absorbed by the expansion and contraction of the transparent sheet 16, deformation and bending of the transmission screen 15 are prevented.

According to such a structure, since the surface of the transmission screen 15 is covered with the transparent sheet 16, the surface of the transmission screen 15 is prevented from being damaged. Alternatively, dust is prevented from adhering to the surface of the transmission screen 15. Further, the surface of the transmission screen 15 can be protected from external humidity and water droplets, and particularly, the screen 15 can be protected from external rain and dew.

Next, another embodiment will be described with reference to FIG. This embodiment shows an example in which the transmission screen 15 is constituted by a single relatively thick screen. Here, a step 33 is formed in a step-like manner on the end face on the outer peripheral side of the transmission screen 15, and such a step 33 is formed at the edge of the protruding piece 34 provided on the tip side of the fixed frame 14. In such a state, the transmission screen 15 is fixed to the fixed frame 14 by the transparent sheet 16.

Here, the edge of the step 33 on the front end side is set to a size that does not prevent an optical image from being formed on the outer edge of the transmissive screen 15. Therefore, even with such a configuration, it is possible to form an optical image on the entire surface of the transmission screen 15, and it is possible to prevent the frame from being exposed on the outer peripheral portion of the transmission screen 15. Moreover, the projecting piece 34 engaging with the step 33 allows
The screen 32 can be fixed to the fixing frame 14 more stably.

[0025]

As described above, according to the present invention, the transparent screen is covered with the transparent sheet from the front side thereof, and the periphery of the transparent sheet is fixed to the fixed frame.

Therefore, according to the present invention, the transmission screen is fixed to the fixed frame via the transparent sheet, so that the frame is not exposed at the periphery of the transmission screen, and the entire surface of the transmission screen is covered. It becomes possible to form an optical image forming surface.

According to the construction in which the transparent sheet is made of a transparent polymer material and the outer surface on the front side is coated with an anti-reflection coating, reflection of external light is prevented, and the image quality is improved. Be improved.

According to the configuration in which the transparent sheet is fixed to the fixed frame in a state where tension is applied by a wire attached to the outer peripheral portion of the fixed frame, the transparent sheet for fixing the transmission screen to the fixed frame is provided. Wrinkles do not occur, and the transparent sheet comes into close contact with the transmission screen.

According to the structure in which the projecting piece is continuously connected to the lower edge portion of the fixed frame so as to project to the front side, and the projecting piece receives the lower end face of the transmissive screen, the projecting piece receives the load of the transmissive screen. Deflection of the transparent sheet can be prevented.

According to the configuration in which the fixed frame to which the transmissive screen is fixed is detachably connected to the cabinet, the transparent sheet can be easily attached to and detached from the fixed frame.

According to the configuration in which the transmissive screen is the screen of the rear projector, it is possible to provide a rear projector having a transmissive screen whose frame is not exposed on the outer peripheral surface, and to make the outer surface of the transmissive screen transparent. The sheet allows for protection.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an assembly of a rear projector.

FIG. 2 is a longitudinal sectional view of a main part showing a mounting structure of a transmission screen.

FIG. 3 is a vertical cross-sectional view of a main part showing attachment of a transmission screen according to a modification.

FIG. 4 is a cross-sectional view of a main part showing a mounting structure of a conventional transmission screen.

FIG. 5 is a front view of a conventional rear projector.

[Explanation of symbols]

1 ‥‥ transmissive screen, 2 ‥‥ cabinet, 3, 4
{Screen frame, 5, 6} Bending piece, 10}
{Cabinet, 11} aperture, 14} fixed frame, 15} transmissive screen, 16} transparent sheet,
20 ° rim, 21 ° wire, 22 ° protrusion, 26
‥‥ Rib, 27 ‥‥ circumference, 28 ‥‥ screw, 32 ‥‥ screen, 33 ‥‥ step, 34 ‥‥ projection

Claims (6)

[Claims] 1. A fixing device for fixing a transmission type screen to a fixing frame, wherein a transparent sheet is placed on the transmission type screen from the front side thereof, and a peripheral portion of the transparent sheet is fixed to the fixing frame. A fixing device for a transmission screen characterized by the above-mentioned. 2. The transmission screen according to claim 1, wherein the transparent sheet is made of a transparent polymer material, and has an anti-reflection coating on an outer surface on a front side thereof. Fixing device. 3. The transmission type according to claim 1, wherein the transparent sheet is fixed to the fixed frame in a state where tension is applied by a wire mounted on an outer peripheral portion of the fixed frame. Screen fixing device. 4. A projection is connected to a lower edge of the fixed frame so as to project toward the front side, and the projection receives a lower end surface of the transmission screen.
3. The fixing device for a transmission screen according to claim 1. 5. The fixing device for a transmission screen according to claim 1, wherein the fixing frame to which the transmission screen is fixed is detachably connected to a cabinet. 6. The fixing device for a transmission screen according to claim 1, wherein the transmission screen is a screen of a rear projector.