JPH05173250A - Projection television - Google Patents

Abstract

PURPOSE:To perform safe and reliable mounting of a screen member without breakage and to simplify a removing work by mounting the screen member to projection television body in coordination with a magnet and a magnetic substance. CONSTITUTION:Magnets 26 are mounted at intervals of a given distance to the periphery of a screen member 12 and on a television body casing 14. A cushion member 28 is laminated on the inner surface of the tip part of a press door 22 rotatably mounted by means of hinges 24. The magnets 26 have a height set so that when the press door 22 is rotated and brought into contact with the screen member 12, a gap is provided between the inner surface of the press door 22 and the screen member. The provision of the gap causes press of the screen member 12 against the television body casing 14 in a state that the cushion member 28 is squeezed as the press door 22 formed of a magnetic material is attracted to the magnets 26, and this way causes holding of the screen member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection television which projects an image projected from a CRT for projection onto a screen member, and more particularly to a mounting structure for the screen member.

[0002]

2. Description of the Related Art Television cathode ray tubes are limited in size in view of manufacturability and cost, and in order to obtain a large image, a method of enlarging an image projected from the cathode ray tube and projecting it on a screen member is used. Has been. A television using this method is called a projection television.
Conventionally, the screen member is attached to the main body of the projection television by screwing via a bracket.

[0003]

However, the screen member is generally a plastic lens, such as a combination of a Fresnel lens and a lenticular lens,
If the screw fastening force is incorrect, there is a risk of damaging the screen member. In addition, the workability of the screw fixing work is generally poor, and the efficiency of the work of attaching the screen member is poor. Therefore, there is a problem in that after-sales services such as replacement and cleaning of the screen member are troublesome. Furthermore, in the process of assembling the screen member, it is necessary to manage and store a large number of screws, which complicates the assembly process.

An object of the present invention is to provide a projection television having a structure in which a screen member can be mounted safely and reliably and the mounting work is simple.

[0005]

In view of the above object, the projection television of the present invention is a projection television that projects an image projected from a CRT for projection onto a screen member, wherein the screen member is a magnet on the main body of the projection television. It is characterized in that it is attached in cooperation with a magnetic material.

[0006]

The screen member can be easily attached to the main body of the projection television because of the cooperative attraction between the magnet and the magnetic material. Furthermore, unlike screw fixing, local stress concentration does not occur.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 is a perspective view of an embodiment of a projection television according to the present invention seen obliquely from the front. First, the overall structure of the projection television 2 will be described. 6 is a vertical sectional view taken along the line AA of FIG. 1, and FIG. 7 is a vertical sectional view taken along the line C-C of FIG. Referring to these drawings, three projection cathode ray tubes 4, 6 and 8 for respectively emitting red (R), green (G) and blue (B) video signals are provided in the chassis 1.
It is attached to 0 and fixed. The chassis 10 has a first chassis member 11 to which the cathode ray tubes 4, 6, 8 are directly attached, and a pair of second chassis members 13 that support both ends of the first chassis member 11. The second chassis member 13 is a support base 16 of the TV body casing 14.
It stands upright.

A reflecting mirror 16 is attached above the rear part of the TV main body casing 14, and the TV main body casing 14 is provided on the front upper part of the TV main body casing 14.
The screen member 12 is attached to the screen by a structure described later. The reflecting mirror 16 is attached at an appropriate angle so that the image projected from each cathode ray tube is reflected and an image is formed on the back surface of the screen member 12.

As shown in FIG. 8, the screen member 12 has a Fresnel lens 1 arranged on the side on which the light 40 is incident.
2A and lenticular lens 12B arranged in front of it
It is a laminated body composed of and. The light 40 from the rear of the Fresnel lens 12A is once condensed by the Fresnel lens 12A, and then distributed to the left and right by the lenticular lens 12B.

A structure for attaching the screen member 12 to the television main body casing 14 in the projection television 2 having such a configuration will be described with reference to FIG. As shown in FIG. 1, the lower end of the screen member 12 is L attached to the television main body casing 14.
It is received by a U-shaped or U-shaped receiving member 20. The upper end and both sides of the screen member 12 are held by an L-shaped pressing door 22 rotatably attached to the television main body casing 14 by a hinge 24. The pressing door 22 is made of a magnetic material such as steel, magnetic rubber, or resin.

This holding structure will be described in detail with reference to FIG. 2 which is a cross-sectional view taken along the line BB of FIG. Magnets 26 are attached around the screen member 12 and on the TV body casing 14 at predetermined intervals. A cushion member 28 is attached to the inner surface of the front end portion of the pressing door 22 that is rotatably attached by the hinge 24. Cushion member 28
For example, a rubber material, a foamed resin, or the like is used. Then, in the magnet 26, the pressing door 22 is rotated as shown by an arrow in FIG.
The height is set so that a gap 30 is formed between the inner surface of the pressing door 22 and the inner surface of the pressing door 22. Due to the existence of the gap 30, the pressing door 22 made of a magnetic material is provided.
While being sucked by the magnet 26, the screen member 12 can be pressed against the television main body casing 14 while being crushed by the cushion member 28, and can be held thereby.

The receiving member 20 is the screen member 12
When attaching, the screen member 12 is useful for temporarily placing the screen member 12, and then the screen member 12 is held by closing each holding door 22, so that the screen member 12 is easily attached. Further, in this case, since the holding door 22 is the front surface of the projection TV 2, consideration should be given to unifying it with the same color as that of the TV main body casing 14 so as not to spoil the aesthetic appearance. It is desirable to set the shape and size of each end portion so that they are in a butted form so as not to occur.

FIG. 3 is a view showing a second embodiment of the mounting structure of the screen member 12 of the projection television 2 according to the present invention. A frame member 32 made of a magnetic material is attached to the periphery of the screen member 12 and fixed to the magnet 26 fixed around the front surface of the television main body casing 14 to be attracted. Further, the screen member 12 and the frame member 32 do not necessarily have to be attached to each other, and the screen member 12 may be sandwiched between the magnet 26 and the frame member 32 separately. The frame member 32 may be made of a magnetic material having rigidity such as steel or the like, or a magnetic material having flexibility such as a magnetic rubber member. Moreover, it is preferable to provide a cushion member as in the first embodiment.

Further, FIG. 4 is a diagram showing a third embodiment according to the present invention. In this embodiment, the front upper portion 14 of the television main body casing 14 of the projection television 2 is
A is composed of a magnetic material. Then, the magnet 26 is attached to the assembly in which the frame member 34 is attached and fixed around the screen member 12, and the magnet 2 is attached to the front upper peripheral portion 14A of the television main body casing 14 made of the above magnetic material.
Attach so that 6 is adsorbed. As in the case of the second embodiment, the screen member 12 and the frame member 34 do not necessarily have to be attached to each other, but they are separate, and the magnet 26 and the front upper peripheral portion 14 of the television body casing 14 are separated.
The frame member 34 and the screen member 12 may be sandwiched between A and A. Like the frame member 32 shown in FIG. 3, the frame member 34 may be made of a hard magnetic material or a soft magnetic material. Moreover, it is preferable to provide a cushion member as in the first embodiment.

FIG. 5 is a diagram showing a fourth embodiment according to the present invention. Pressing members 38 that are rotatable around the pivot pins 36 are attached to the four corners of the front surface of the television main body casing 14 of the projection television 2 where the screen members 12 are attached.
A magnet 26 is attached to the periphery of the screen member 12 whose corners are held by the pressing member 38. The frame member 34 made of a magnetic material is attracted to the magnet 26, whereby the screen member 12 is fixed. To do. Also in this embodiment, it is desirable to provide the cushion member as in the first embodiment.

Although each of the above embodiments describes a rear projection type projection television, the present invention is not limited to this and may be a front projection type projection television.

[0017]

As is apparent from the above description, according to the present invention, since the screen member is attached to the main body of the projection television by the adsorption action by the cooperation of the magnet and the magnetic material, it is greatly different from the fastening by the screw.
The screen member can be attached safely and securely without damaging the screen member, and the attaching and detaching work becomes simple.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a projection television according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line BB of FIG.

FIG. 3 is a perspective view showing a second embodiment of the projection television according to the present invention.

FIG. 4 is a perspective view showing a third embodiment of the projection television according to the present invention.

FIG. 5 is a perspective view showing a fourth embodiment of the projection television according to the present invention.

6 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 7 is a vertical cross-sectional view taken along the line CC of FIG.

FIG. 8 is a perspective view of a screen member used in a projection television.

[Explanation of symbols]

 2 ... Projection television 4, 6, 8 ... CRT for projection 12 ... Screen member 12A ... Fresnel lens 12B ... Lenticular lens 14 ...・ ・ ・ TV body casing 22 ・ ・ ・ ・ ・ Pressing door 26 ・ ・ ・ Magnet 28 ・ ・ ・ ・ Cushion members 32, 34 ・ ・ ・ Frame member 38 ・ ・ ・ ・ ・ Pressing member

Claims (2)

[Claims] 1. A projection television for displaying an image projected from a projection cathode ray tube on a screen member, wherein the screen member is attached to a main body of the projection television by cooperation of a magnet and a magnetic material. TV set. 2. The magnet is fixed to a main body of the projection television, and a pressing door made of a magnetic material attracted by the magnet is rotatably attached to the main body of the projection television via a hinge. Projection television described in.