JP3353605B2 - Projection receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode-ray tube of a projection type image receiving apparatus (International Patent Classification H04N5 / 74) for enlarging and projecting an image projected on the image receiving apparatus by using a projection lens and an optical section structure around the lens. It is about.

[0002]

2. Description of the Related Art In recent years, in a projection type receiver, for the purpose of cooling or improving contrast on a projection screen,
The use of a technique of filling a transparent liquid between a cathode ray tube and a projection lens has become mainstream. As a container to be filled with the transparent liquid (hereinafter referred to as a radiator), it is necessary to couple and fix the cathode ray tube and the projection lens, so aluminum with both flexibility in shape design and machinability for strength and precision Daigast has been generally used (Japanese Patent Application No. 6-280557). Also, since the transparent liquid is warmed to the cathode ray tube, which becomes hot when energized,
In order to prevent the internal pressure from increasing due to the thermal expansion, it is common practice to attach a pressure regulating valve made of a film-like elastic body to a part of the radiator (JP-A-1-318473).

Hereinafter, a conventional projection type receiver will be described with reference to the drawings. FIG. 6 is a sectional view showing an example of the configuration of a conventional projection type receiver. The cathode ray tube 1 and the projection lens 2 are coupled by a radiator 4, which is filled with a refrigerant liquid 3. The radiator 4 is made of aluminum die cast. The cathode ray tube 1 is tightly fixed to the radiator 4 via an O-ring 5 by a cathode ray tube fixing plate 9 screwed to the radiator 4. The lens 2 is tightly fixed to the radiator 4 via an O-ring 6 by a lens fixing plate 10 screwed to the radiator 4. Part of the radiator 4 is a pressure regulating valve 8- made of a film-like elastic body.
2 is closely fixed by a pressure regulating valve fixing plate 11.

The cathode ray tube 1 may generate X-rays. However, since the material of the radiator 4 is aluminum, X
There is almost no line shielding function, and it is generally necessary to cover the periphery with an X-ray shielding member 17 such as an iron plate for safety.

[0005]

However, in such a conventional configuration, since the radiator is made of aluminum die cast, the molding cost, the surface treatment cost with alumite, and the post-cut machining cost of the parts required for accuracy are reduced. In addition, since an X-ray shielding plate is additionally required, the cost is high, and there is a limit to cost reduction.

Further, the fixing of the cathode ray tube, the lens, and the pressure regulating valve to the radiator has a drawback that the number of parts increases because each fixing plate is screwed to the radiator.

[0007]

In order to solve the above-mentioned problems, a projection-type receiver according to the present invention comprises a face surface of a cathode ray tube,
A container filled with a liquid is formed in a space between the projection lens and the projection lens disposed in front of the container.

Further, a container filled with liquid is formed in a space between the face surface of the cathode ray tube and the projection lens disposed in front thereof, and a positioning function and a fixing function of the cathode ray tube and the projection lens are provided outside the container. It is characterized in that it has a supporting structure to be combined.

In addition, a container filled with a liquid is formed in a space between the face surface of the cathode ray tube and a projection lens disposed in front thereof, and a bag-shaped elastic body connected to the container has a function of regulating the internal liquid pressure. It is characterized by having.

According to the present invention, it is possible to provide a projection-type receiver that is low in cost and has a small number of parts and a small number of assembly steps.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a projection surface arranged in front of a face surface of a cathode ray tube.
Form a container filled with liquid in the space with the lens, and
The cathode ray tube and the projection lens are placed outside the
Positioning function of the cathode ray tube and the projection lens
A support structure having a combination of
A seal is fixed between the cathode ray tubes, and the container and the projection lens are fixed.
Characterized by having a means for sealing and fixing the gap between
Therefore, the number of parts, assembly man-hours and costs are reduced.
Has the effect of causing

[0012] Next, the invention according to claim 2 provides the above- mentioned container.
2. A container formed by processing a sheet metal.
The projection type receiver described above has an effect of reducing the cost of parts.

According to a third aspect of the present invention, there is provided the projection type receiver according to the first aspect, wherein the inner surface of the container is plated with black. It has the effect of reducing the light reflectance of the inner surface.

[0014]

[0015]

According to a fourth aspect of the present invention, there is provided the projection type receiver according to the first aspect, wherein the support structure is made of resin, and the cost of parts is reduced. Has the effect of

Next, the invention according to claim 5 of the present invention is a bag-shaped elastic body connected to the container , wherein
Structure in which the body freely flows between the elastic body and the container
Internal pressure regulating means having an internal liquid
A projection type receiver according to the first aspect of the present invention has an effect of reducing the number of parts, the number of assembling steps and the cost.

[0018]

Next, the invention of claim 6 of the present invention, a projection type image receiving according to claim 5, characterized in that the connecting portion between the liquid container and the bag-like elastic body is fixed by the tape It has the effect of increasing sealing reliability at low cost.

Next, the invention of claim 10 of the present invention, claims, characterized in that the connecting portion between the liquid container and the bag-like elastic body is fixed by a clip-like spring 5
The projection type receiver described above has an effect of increasing the seal reliability at low cost.

(Embodiment 1) Embodiments of the present invention described in claims 1, 2 and 3 of the present invention will be described below with reference to FIG. A radiator 4 connecting the cathode ray tube 1 and the projection lens 2 is filled with a transparent liquid 3. The radiator 4 is a drawn product such as a metal having an X-ray shielding function, for example, an iron plate. Therefore, the conventionally required X-ray shielding plate surrounding the periphery is not required.
The cathode ray tube 1 is fixed with a radiator 4 and an adhesive 12 on its side. Further, a sheet metal bending part 13 having a screw hole is fixed to the radiator 4 by spot welding or the like, and the lens 2 is attached to the O-ring 6 by a lens fixing plate 10 screwed to the sheet metal bending part 13. Fixed through. Therefore, according to this structure, since there is no part directly screwed to the radiator 4, it is possible to produce the radiator 4 by drawing an inexpensive simple shape instead of expensive aluminum die gust.

Further, the inner surface of the radiator 4 needs to be black in order to suppress unnecessary reflected light which leads to deterioration of optical performance. Therefore, it was necessary to perform relatively costly black alumite treatment on aluminum die cast material,
By using a drawn product such as an iron plate, it has become possible to adopt a less expensive plating process, for example, black chrome plating.

(Embodiment 2) Next, an embodiment of the invention described in claims 4, 5 and 6 of the present invention will be described with reference to FIG. In addition, the same reference numerals are used for the same components as those in the above-described embodiment, and the description is omitted.

A lens 2, an O-ring 6, a radiator 4, an O-ring 5, and a cathode ray tube 1 are arranged inside a support structure 7 in this order, and the cathode ray tube 1 is fixed to a pillar of the support structure 7 by screws. Each member is sealed and fixed by being pressed by the tube fixing plate 9.

According to this structure, the only fixing plates and screws necessary for fixing each component are the cathode ray tube fixing plate 9 and the screws for fixing it. For example, it is also possible to use only four screws for retaining four corners. Therefore, the number of parts and the number of assembling steps can be significantly reduced as compared with the conventional structure, and the cost can be reduced.

The support structure 7 also has a function of positioning the cathode ray tube 1 and the lens 2 which has a significant effect on optical performance.
Therefore, the support structure 7 can be made of a metal such as die gust, and the accuracy can be improved by post-processing such as cutting.
It is more cost-effective to make the resin by injection molding a lower cost resin, for example, a resin having high dimensional accuracy and high rigidity.

(Embodiment 3) Next, embodiments of the present invention described in claims 7, 8, 9, and 10 of the present invention will be described with reference to FIGS. This will be described with reference to FIG.

A bag-shaped pressure regulating valve 8-1 made of an elastic material, for example, rubber, is connected to a part 14 of the metal drawing radiator 4 which is drawn in a pipe shape. Since the liquid 3 can freely enter and exit between the radiator 4 and the pressure control valve 8-1, when the power is supplied, the thermally expanded liquid flows from the radiator 4 to the pressure control valve 8-1, and the pressure control valve 8-1 expands, thereby increasing the liquid pressure. Can be kept constant. Radiator 4 and pressure regulator 8
The connection with -1 is made by making the outer diameter of the radiator pipe-shaped portion 14 larger than the inner diameter of the opening of the pressure regulating valve 8-1, since the pressure regulating valve 8-1 is an elastic body. At the time of assembly, it is sealed simply by fitting. Therefore, the number of parts and the number of assembling steps can be greatly reduced as compared with the conventional structure in which the pressure regulating valve is fixed using the pressure regulating valve fixing plate and the screw. Further, in order to enhance the reliability of the seal connection between the radiator 4 and the pressure regulating valve 8-1, an adhesive tape 15 can be attached around the connection portion as shown in FIG. 4 and fixed. Further, as shown in FIG. 5, the connection portion can be tightened by a clip-shaped spring 16 to increase the connection strength.

[0029]

As is clear from the above embodiments, according to the present invention, it is possible to provide a projection type receiver which is low in cost and requires few parts and assembling steps.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view showing a main part according to a second embodiment of the present invention;

FIG. 3 is a sectional view showing a main part of a third embodiment of the present invention.

FIG. 4 is a sectional view showing a connection portion between the radiator and the pressure regulating valve in FIG. 3;

FIG. 5 is a sectional view showing another connecting portion between the radiator and the pressure regulating valve in FIG. 3;

FIG. 6 is a sectional view showing a main part of a conventional projection type receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cathode ray tube 2 Projection lens 3 Refrigerant liquid 4 Liquid container (radiator) 5 O-ring 6 O-ring 7 Support structure 8-1 Bag-shaped pressure regulating valve 8-2 Film-shaped pressure regulating valve 9 Cathode ray tube fixing plate 10 Lens fixing plate 12 Adhesion Agent 13 Sheet metal bending parts 14 Parts squeezed into a radiator pipe 15 Adhesive tape 16 Clip spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/74 G03B 21/16 H01J 7/26 H01J 31/10

Claims (7)

(57) [Claims] And 1. A face surface of the cathode ray tube to form a container filled with a liquid to a space between the projection lens disposed in front, the place on the container outside, said projection Les said cathode ray tube
The lens narrowing scissors, a support structure having both the positioning function and the fixing function of the cathode ray tube and said projection lens, before
A seal is fixed between the container and the cathode ray tube, and the container is
A projection type receiver comprising means for sealing and fixing between the projection lenses . 2. The container is formed by processing sheet metal.
The projection type receiver according to claim 1, wherein: 3. A projection type receiver according to claim 1, characterized by being the inner surface of the container and black plating. 4. A projection type receiver according to claim 1, wherein the support structure is made of a resin. 5. A bag-shaped elastic body connected to the container.
And the internal liquid freely flows between the elastic body and the container.
Of pressure control function for the internal liquid with a structure
The projection type receiver according to claim 1, wherein: 6. The projection type receiver according to claim 5 , wherein a connection portion between said bag-shaped elastic body and said container is fixed with a tape. 7. The projection type image receiving apparatus according to claim 5 , wherein a connection portion between said bag-shaped elastic body and said container is fixed by a clip-shaped spring.