JPH05145874A - Projection television - Google Patents

Abstract

PURPOSE:To provide the projection television whose chassis hardly deforms or breaks even if a lateral force operates on the chassis supporting cathode-ray tubes and which can reduce deviation in registration. CONSTITUTION:The projection television 22 which projects images from the projection cathode-ray tubes 4, 6, and on a display screen has a 1st chassis member 11 which supports the projection cathode-ray tubes 4, 6, and 8, and a couple of 2nd chassis members 13 which are stood on the base 16 of a casing 14 fitted with a display screen 12 and support both end parts of the 1st chassis member 11; and the upper part of both the 2nd chassis members 13 are elastically supported by a cabinet 26, fixed to the casing 14 through an elastic member 24, from outside respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a projection television using a cathode ray tube, and more particularly to a projection television capable of preventing deformation of a chassis supporting the cathode ray tube.

[0002]

2. Description of the Related Art There are cases where a plurality of people want to view a numerical or image display at the same time. In such a case, the display screen needs to be large. A projection television as shown in FIG. 4 is known as an apparatus having a large display screen and capable of large-scale display. Figure 4 (A)
[Fig. 3] is a sectional view taken along line AA shown in Fig. 1B.

In the projection television 2 shown in FIG. 4, three projection cathode ray tubes 4, which emit red (R), green (G) and blue (B) video signals, respectively.
6 and 8 are attached and fixed to the chassis 10. The chassis 10 includes a first chassis member 11 to which the cathode ray tubes 4, 6, 8 are directly attached, and the first chassis member 11
And a pair of second chassis members 13 that support both ends of the. The second chassis member 13 is erected on the support base 16 of the casing 14.

A relatively large display screen 12 is mounted above the front of the casing 14. Also, casing 1
A reflecting mirror 16 for reflecting an image projected from each cathode ray tube 8 and forming an image on the back surface of the display screen is attached inside the display 4.

[0005]

By the way, in such a conventional projection television 2, there is a problem that the chassis 10 supporting the CRTs 4, 6, 8 having a relatively large weight is vulnerable to lateral vibration. is doing. That is,
When vibration is applied to the chassis 10 in the lateral direction (the direction of the arrow X in FIG. 4A), the first chassis member 13 in the chassis 10 may be deformed in the lateral direction. There is a problem such as misregistration of the projected image.

In order to solve such a problem, in the conventional art, as shown in FIG. 5, a second chassis 10 is constructed.
The upper end of the chassis member 13 is rigidly fixed to a cabinet 18 or the like attached to the side wall of the casing 14 with screws or the like. However,
In such a configuration, when a force in the lateral direction X is applied to the chassis 10 due to vibration or the like, a strong force is intensively applied to the base portion 20 of the second chassis member 13, and deformation or breakage easily occurs. Then, since it does not return to the original position, there is a problem that it is difficult to repair the misregistration.

The present invention has been made in view of the above situation, and even if a lateral force acts on the chassis supporting the cathode ray tube, the chassis is unlikely to be deformed or destroyed, and misregistration in registration can be reduced. The purpose is to provide a possible projection television.

[0008]

In order to achieve the above object, a projection television of the present invention is a projection television which projects an image projected from a projection cathode ray tube on a display screen. The second chassis member includes a chassis member and a pair of second chassis members that are erected on a support base of the casing to which the display screen is attached and that support both side ends of the first chassis member. Are elastically supported from the outside via elastic members by auxiliary supporting members fixed to the casing.

[0009]

In the projection television of the present invention, the upper portion of the second chassis member that supports both side ends of the first chassis member that supports the CRT for projection is elastically supported by the auxiliary support member via the elastic members from the outside. Since it is supported, even if a lateral force acts on the chassis member due to vibration or the like, the lateral displacement of the chassis member is absorbed by the elastic member, and a strong force is concentrated on the base portion of the second chassis member. It can be prevented from acting. Further, since the elastic force of the elastic member acts in the direction to return the deformation of the second chassis member, the registration of the cathode ray tube can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A projection television according to an embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the inside of a projection television according to an embodiment of the present invention, (A) is a sectional view taken along the line AA of (B), and FIG. 2 shows the details of the periphery of the elastic member shown in FIG. FIG. 3 is a perspective view of a main part shown in FIG. 3, and FIG. 3 is a view of the surrounding details of the elastic member shown in FIG.

As shown in FIG. 1, in a projection television 22 according to an embodiment of the present invention, three projection cathode ray tubes 4, which emit red (R), green (G) and blue (B) video signals, respectively. 6 and 8 are chassis 1
It is attached and fixed to 0. The chassis 10 is a first chassis member 1 to which the cathode ray tubes 4, 6 and 8 are directly attached.
1 and a pair of second chassis members 13 that support both ends of the first chassis member 11. The second chassis member 13 is erected on the support base 16 of the casing 14 that forms the outer shell of the projection television 22.

A relatively large display screen 12 is mounted above the front of the casing 14. The display screen 12 is composed of, for example, a screen in which a Fresnel lens and a lenticular lens are laminated. Further, inside the casing 14, a reflecting mirror 16 for reflecting the image projected from each cathode ray tube 8 and forming an image on the back surface of the display screen.
Is attached.

In this embodiment, both the second chassis members 1 are
The upper part of 3 is elastically supported from the outside via elastic members 24 by a cabinet 26 as an auxiliary support member fixed to the casing 14. The elastic member 24 is not particularly limited and, for example, a coil spring, a leaf spring, a rubber material, a synthetic resin or the like can be used. The number of elastic members 24 to be mounted is not particularly limited, and one elastic member 24 may be mounted at least on the outside of the second chassis member 13.

2 and 3 show a leaf spring 2 as an elastic member.
An example using 4a is shown. The base end portion 28 of the leaf spring 24a is attached to the side wall of the second chassis member 13 by using screws or bolts. The leaf spring 24a is bent in a U shape in a chevron shape, and its tip portion 30 is located outside the second chassis member 13, and the protruding portion 32 of the leaf spring 24a.
Is pressed against the end of the cabinet 26. Therefore, the leaf spring 24a is connected to the second chassis member 1
3 and an end of the cabinet 26 are widened to expand. Although not shown in FIGS. 2 and 3, the same leaf spring 2 is provided outside the second chassis member 13 holding the other end of the first chassis member 11.
4a is attached.

In the projection television 22 of this embodiment, the second chassis member 13 which supports both side ends of the first chassis member 11 which supports the cathode ray tubes 4, 6, 8 for projection.
Since the upper portions of the chassis 10 are elastically supported by the cabinet 26 from the outside via the elastic members 24, even if a lateral force acts on the chassis 10 due to vibration or the like, the lateral displacement of the chassis 10 is elastic. It is possible to prevent the strong force from being absorbed by the member 24 and intensively acting on the base portion of the second chassis member 13. Further, since the elastic force of the elastic member 24 acts in a direction to return the deformation of the second chassis member 13, the cathode ray tubes 4, 6, 8
Registration of can be reduced.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention. For example, the leaf spring 24 as the elastic member 24
The a may be fixed to the cabinet 26 side instead of being fixed to the second chassis member 13 side. The number of cathode ray tubes attached to the chassis 10 is not particularly limited, and may be one or more.

[0017]

As described above, according to the present invention, the upper portion of the second chassis member that supports both end portions of the first chassis member that supports the CRT for projection is provided with elastic members from the outside. Since it is elastically supported by the auxiliary support member, even if a lateral force acts on the chassis that supports the cathode ray tube, the chassis is unlikely to be deformed or destroyed, and misregistration can be reduced. It has an excellent effect of becoming.

[Brief description of drawings]

FIG. 1 shows the inside of a projection television according to an embodiment of the present invention, and FIG. 1A is a sectional view taken along the line AA of FIG.

FIG. 2 is a perspective view of relevant parts showing details around the elastic member shown in FIG.

FIG. 3 is a top view of the details of the periphery of the elastic member shown in FIG.

FIG. 4 shows the inside of a projection television according to a conventional example, and FIG. 4A is a sectional view taken along the line AA of FIG.

FIG. 5 is a schematic view showing a chassis portion of a projection television according to a conventional example.

[Explanation of symbols]

 4, 6, 8 ... CRT for projection 10 ... Chassis 11 ... First chassis member 12 ... Display screen 13 ... Second chassis member 14 ... Casing 16 ... Support 22 ... Casing 24 ... Elastic member 24a ... Leaf spring 26 ... Cabinet ( Auxiliary support member)

Claims (2)

[Claims] 1. A projection television for displaying an image projected from a projection CRT on a display screen, a first chassis member for supporting the projection CRT,
It has a pair of second chassis members which are erected on the support base of the casing to which the display screen is attached and which support both side ends of the first chassis member. The projection television is elastically supported by an auxiliary support member fixed to the casing via elastic members from the outside. 2. The projection television according to claim 1, wherein at least three projection CRTs for emitting red, green and blue video signals are attached to and supported by the first chassis member.