JP2001318431A - Screen mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time for mounting by making a screen mountable to a frame without screws and to prevent the degradation in grade by eliminating distortions in the reflected images projected on the screen after the mounting. SOLUTION: Ribs 2a erected on the inside surface side of the frame 2 are provided with through-holes 2b and hook-shaped detaining pieces 3a disposed in part of a screen retaining member 3 are elastically fitted into these through- holes 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen mounting apparatus for mounting a screen constituting a projection type television receiver on a frame.

[0002]

2. Description of the Related Art Conventionally, as a method of mounting a screen for forming a projected image, for example, Japanese Patent Application Laid-Open No. 7-56234 shown in FIG. 5 has been proposed. The configuration of FIG. 5 is a screen 101 including a Fresnel lens sheet, a lenticular lens sheet, and a front panel.
Is fastened and fixed to the frame 102 with a metal fitting 103 and a screw 104 or the like.

[0003]

However, in the above-described conventional configuration, the metal fitting 103 and the fastening screw 1 are provided on the inner surface of the frame 102.
However, since the screen is mounted by using the 04, there is a problem that the man-hour for mounting the screen is large. Also, screw 104
The fastening portion may be distorted, distorting the front panel, and as a result, the reflection image reflected on the front panel may be distorted and the quality may be degraded. Further, when the area of the projection light applied to the metal fittings is large, the reflected light reflected from the metal fittings is incident on the screen, resulting in deterioration of image quality such as contrast. As means for preventing the light reflected from the fitting from entering the screen, for example, a nonwoven fabric or the like is attached to the surface of the fitting.

[0004]

In order to solve the above-mentioned problems, a screen mounting apparatus according to the present invention is characterized in that a rib provided on an inner surface side of a frame has one of a hook, a recess, and a through hole. And a hook-shaped locking piece provided on a part of the screen holding member is elastically deformed and fitted into any one of the hook, the concave portion, and the through hole. With this configuration, the screen can be screw-lessly mounted on the inner surface side of the frame, and the screen mounting time can be reduced. In addition, there is no distortion to the attached screen and no deterioration in quality.

According to the present invention, in a screen holding member, an uneven surface for preventing the projection light from being reflected toward the screen is provided in a region where the projection light is irradiated,
As a result, unnecessary light incident on the screen can be eliminated, and a decrease in image quality can be prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A screen mounting apparatus according to an embodiment of the present invention will be described below with reference to FIGS.

(Embodiment) FIG. 1 is an exploded perspective view of a screen mounting apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part showing a process of assembling the screen mounting apparatus of FIG. 1 and 2, reference numeral 1 denotes a screen, 2 denotes a frame, 3 denotes a screen pressing member, 2a denotes a rib provided on the inner surface side of the frame, 2b denotes a through hole formed in the middle of the rib, and 3a denotes a screen. Hook-shaped locking pieces 3b extending in a cantilever shape on a part of the pressing member are end faces of the screen pressing member.

The frame 2 has a substantially U-shaped cross section, and a rectangular through window is formed on the main surface (viewer side) facing the opening. In the vicinity of the top surface, the bottom surface, and both side surfaces, ribs 2a are provided from the main surface toward the inner surface side (opening side). A through hole 2b is formed in the middle of the rib 2a. A hook-shaped locking piece 3a described later is fitted into the through hole 2b. In addition, the hook-shaped locking piece 3a is used instead of the through hole 2b.
May be provided, or a hook portion in which the hook-shaped locking piece 3a is locked. (All are not shown.)
The frame 2 is formed by injection molding a resin member, a magnesium alloy, or the like into a substantially bottomed container shape having a rectangular through window on the main surface.

The screen pressing member 3 has a substantially Z-shaped cross-sectional shape, and is partially provided with a hook-shaped locking piece 3a extending in a cantilever shape. The screen holding member 3 is formed by injection molding a resin member, and the hook-shaped locking piece 3a is elastically deformable.

The assembling process of the screen mounting device will be described with reference to FIGS. 2 (a), 2 (b) and 2 (c).
First, the screen 1 is loaded into the frame 2 from the opening side of the frame 2. Next, the screen holding member 3 is opened from the opening side.
Is mounted so as to clamp the rib 2b erected on the inner surface side of the frame 2. The mounting procedure is in the order of FIGS. 2 (a), (b) and (c). By fitting the hook-shaped locking piece 3a into the through hole 2b, the peripheral edge of the screen 1 can be pressed and fixed by the end face 3b.

In the embodiment shown in FIG.
The four screen pressing members are respectively fitted on the inner surface side of the frame 2 corresponding to the four sides. Of course, it goes without saying that the screen holding member may be formed into an integral rectangular frame instead of being divided into four. (Not shown) Even if an external force acts on the screen 1 in the X + direction, the hook-shaped locking piece 3a provided on the screen member 3 is fitted, so that the screen pressing member 3 is not formed. It does not come off the frame 2. Also, the hook-shaped locking piece 3a of the screen member 3 is
The screen holding member 3 can be removed from the frame 2 by applying an external force in the direction and pulling in the X + direction.

Next, another screen holding member according to the present invention will be described. FIG. 3 is a sectional view of a principal part showing a relationship between a projection locus of image light emitted from the lens 4 optical system and a screen, and FIG. 4 is an enlarged sectional view of a principal part of another screen pressing member according to the present invention. . 3 and 4, reference numerals 3, 30 are screen holding members, 4 is a lens, 5 is projection light of a screen image size (incident light to the screen), and 5a is projection light in an overscan state. , 6 are reflected light of the projected light reflected on the surface of the member or the like;
Indicates an uneven surface.

Another screen holding member 30 according to the present invention is characterized in that an uneven surface 7 for preventing the projection light from being reflected toward the screen 1 is provided in an area irradiated with the projection light. As shown in FIG. 4, when the light (projection light 5 of the screen image size and the projection light 5a in the overscan state) emitted from the lens enters the screen 1, the screen image is changed. The projection light 5 of the di size directly enters the screen 1 because there is no obstruction before reaching the screen 1.

However, on the other hand, the projection light 5a in the overscan state reaches the surface of the screen pressing member 30, and the projection light 5a reflected on the surface re-enters the screen 1, so that the performance such as contrast is improved. It causes deterioration. Therefore, as shown in FIG. 4, the sawtooth-shaped uneven surface 7 is provided in a region of the screen holding member 30 where the projection light 5 a is irradiated. As a result, the projection light 5a in the overscan state is not reflected to the screen 1 side, and the performance such as contrast is not deteriorated as unnecessary light.

[0015]

As described above, according to the present invention, the screen can be mounted on the frame without screws, and the number of mounting steps can be greatly reduced. Also, the screen distortion after mounting can be reduced, and the distortion of the reflected image reflected on the screen can also be reduced. Further, the uneven surface provided on the screen pressing member can prevent the incident light of the overscan from reaching the screen, thereby suppressing a decrease in contrast.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a screen mounting device according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a process of assembling the screen mounting device of FIG. 1;

FIG. 3 is a sectional view of a main part showing a relationship between a projection locus of projection light and a screen.

FIG. 4 is an enlarged sectional view of a main part of another screen pressing member according to the present invention.

FIG. 5 is a sectional view of a conventional screen fixing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 screen 2 frame 2 a rib 2 b through hole 3, 30 screen holding member 3 a hook-shaped locking piece 3 b end face 4 lens 5 incident light corresponding to screen image size 5 a corresponding to overscan Incident light 6 Reflected light 7 Uneven surface

Claims (4)

[Claims] 1. A screen for forming an image, a frame for accommodating the screen, and a screen pressing member for mounting the screen in the frame, wherein a locking piece provided on the screen pressing member is elastically deformed. A screen mounting device, wherein the screen is fitted on the inner surface side of the frame, and the screen can be mounted on the inner surface side of the frame without screws. 2. A rib standing on the inner surface side of the frame body is provided with any one of a hook, a recess, and a through hole, and one of the hook, the recess, and the through hole is provided with one of the hook, the recess, and the through hole. 2. The screen mounting apparatus according to claim 1, wherein the screen can be screw-lessly mounted on the inner surface of the frame by fitting a hook-shaped locking piece provided on the screen pressing member by elastic deformation. . 3. The screen mounting device according to claim 1, wherein four screen pressing members are fitted on the inner surface side of the frame corresponding to the four sides of the screen. 4. The screen holding member according to claim 1, wherein an uneven surface for preventing the projection light from being reflected toward the screen is provided in an area of the screen pressing member where the projection light is irradiated. Screen mounting equipment.