JPH0622872Y2 - Dustproof panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a dustproof panel used as a display device in an industrial control device or the like, and more particularly to an improvement in which the display screen is easy to see and the number of parts is reduced.

<Prior Art> A dustproof panel is provided on a console equipped with a CRT when a control device is placed at a site where control equipment is placed. Since the CRT has an electron beam applied to the cathode ray tube, dust is easily attached to the surface by being charged with static electricity.

Therefore, the inventor of the present invention is Japanese Patent Application No. 62-312,537 Japanese Patent Publication No. 04-06408.
No. 6, "Optical Touch Screen Dustproof Device" proposes a dustproof panel with a bezel.

<Problems to be solved by the invention> However, the curved shape of the CRT is diverse, and a bezel suitable for this is not always available as a general-purpose molded product. Even if such a bezel is available, a gasket is used to prevent dust. There is also a problem in that the number of parts must be increased and the number of parts must be increased.

As another method, a CRT unit is housed in a commercially available dust-proof case, but there is a problem that the screen becomes difficult to see.

The present invention solves such a problem, and an object thereof is to provide a dustproof panel having a simple structure, a small number of parts, and an easy-to-see screen.

<Means for Solving the Problems> The present invention which achieves such an object is a CRT having a substantially quadrilateral screen, and is provided in correspondence with the four sides of the CRT and has substantially the same surface as the CRT screen. The dustproof panel is attached to a housing having a frame portion of height, and has the following configuration.

That is, a surface dustproof plate having a surface larger than the opening of the frame portion and at least a portion facing the CRT screen is made of a translucent material, and the surface dustproof plate is attached in a frame shape on four sides, A gasket that comes into contact with the frame portion, has an outer periphery that is attached to the back surface of the surface dustproof plate and is slightly smaller than the inside of the frame of the gasket, and has an opening portion that is approximately the same size as the CRT screen,
A structural plate having a contact portion that defines a distance between the surface dustproof plate and the CRT screen, and a structural plate mounted on the back surface of the structural plate and the CR.
A shielding material having a large deformability and a restoring force that closes the space between the T screen and the periphery thereof is provided.

The surface dustproof plate, the gasket, the structural plate and the shielding material can be integrally combined.

<Operation> Each component of the present invention has the following operation. The surface dustproof plate covers the CRT and keeps the screen displayed on the CRT visible. The gasket maintains a hermetic seal between the frame portion of the housing and the surface dustproof plate. Structural plates supplement the rigidity that surface dustproof plates lack. CR is the shielding material
Maintains a tight seal between the T screen and the surface dustproof plate.

<Example> The present invention will be described below with reference to the drawings.

FIG. 1 is a configuration perspective view showing an embodiment of the present invention. In the figure, a casing 20 is also called a console, and is in charge of a man-machine interface of a control device. A dustproof panel 10 covering a CRT is provided on the upper side, and a dedicated keyboard 21 is arranged on the lower side. ing.

2 is a 2-2 cross-sectional view of the apparatus of FIG. CRT
30 is fixed to the housing 20 by using mounting hardware 22, 23. The dustproof panel 10 is composed of four parts, a surface dustproof plate 11, a gasket 12, a structural plate 13 and a shielding material 14, and prevents dust from adhering when the surface of the CRT 30 is sealed. In addition, since the surface dustproof plate 11 is separated from the CRT 30, generally dust is less attached by electrostatic action, and even if it is attached, it is a flat plate and therefore easy to clean.

FIG. 3 is an assembly part diagram for explaining the details of the dustproof panel 10. In the figure, the size of the housing of the CRT 30 itself is
The height is h and the width is w, and the effective display portion of the CRT screen has a substantially rectangular height h0 and a width w0. On the other hand, the dimensions of the frame portion forming the CRT mounting portion of the housing 20 are the inner diameter height h1 and the width w1, which are larger than the height h and the width w of the housing of the CRT 30 itself. Has become. Further, the metal plate forming the frame has a width and a thickness having rigidity required for assembling the housing 20. Screw holes 23 are provided at the corners of the frame portion, and are used for screwing the dustproof panel 10.

The surface dustproof plate 11 has a height h which is the dimension of the opening of the frame.
1, the height h2 and the width w2 are larger than the width w1, and may be values corresponding to the width of the entire housing 20, for example. The central portion 111 is a translucent portion (for example, an acrylic resin plate is used) and has a height h0 and a width w0 corresponding to the effective display screen of the CRT. Perimeter 11
2 is provided on the outer edge of the central portion 111, and is silk-printed so that parts other than the CRT cannot be seen. Screw hole
Reference numeral 113 is a through hole, which is screwed into the screw hole 23 by using a screw (not shown). Gasket 12 is surface dustproof plate 1
It is attached to the four sides of 1 in a frame shape, and abuts the frame portion to maintain a sealed state. Here, the gasket 12 is made of four rod-shaped rigid rubber sponge materials, and the thickness thereof is thicker than that of the structural plate 13.

The structural plate 13 is made of, for example, a metal plate having a thickness of about 1 mm, and has an outer diameter of a height h3 and a width w3 that do not hinder the screwing of the screw holes 113 and 23, and a CRT at the center. An opening 134 having a height h4 and a width w4 which are almost the same as the height h0 and the width w0 of the effective display screen is provided. The upper contact portion 131 is provided on the upper side of the opening 134, and a part thereof contacts the CRT screen. Further, the lower contact portion 132 is provided below the opening portion 134, and the left and right contact portions 133 are provided on both left and right sides of the opening portion 134, and a part of each of them contacts the CRT screen. The space between the CRT screen and the display dustproof plate 11 is determined. The shielding member 14 is attached to the back surface of the structural plate 13 (here, the plane portions of the upper, lower, left, right contact portions 131, 132, 133) and contacts the peripheral portion of the CRT screen to seal between the CRT and the surface dustproof plate 11. Hold the state. The shielding material 14 is made of a material having a large deformability and a restoring force, such as a synthetic rubber sponge material, and is divided into four parts here in view of workability and cost, but even if they are integrated, Good.

The operation of the apparatus thus configured will be described below. Fourth
The figure is an explanatory view of the assembled state of the dustproof panel 10. A gasket 12 is attached to the surface dustproof plate 11, and a shielding material 14 is attached to the structural plate 13. Then, if the structural plate 13 is attached to the surface dustproof plate 11, the dustproof panel 10 is completed, and if this is screwed to the housing 20, dustproof of the CRT is performed.

<Effect of Device> As described above, the present invention has the following practical effects.

Since the space between the surface dustproof plate 11 and the CRT is determined by using the structural plate 13, there is no need to use a bezel that conforms to the curved surface of the CRT, which reduces design constraints and reduces the number of parts.

When the dustproof panel 10 is made of sheet metal, sponge rubber, or the like as in the embodiment, the material cost is reduced, and when a small number of products are manufactured, it is not necessary to manufacture a mold, resulting in cost reduction. .

Since the distance between the CRT screen and the surface dustproof plate 11 can be made small, the CRT screen can be easily seen to the corners.

Shielding material between the CRT screen and the surface dustproof plate 11 1
Since it is surrounded by 4 and the gasket 12, the generation of an internal air flow is prevented and the adhesion of dust that may be generated from the inside of the housing 20 is also prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing the construction of an embodiment of the present invention, FIG. 2 is a cross-sectional view of the device 2-2 of FIG. 1, and FIG.
Fig. 4 is an assembly part diagram for explaining the details of the dustproof panel 1.
It is explanatory drawing of the assembled state of 0. 10 ... Dustproof panel, 11 ... Surface dustproof plate, 12
...... Gasket, 13 ...... Structural plate, 14 ...... Shielding material, 20 ...... Case (console), 30 ...... CRT.

Claims (1)

[Scope of utility model registration request] 1. A CRT having a substantially quadrilateral screen, and a CRT provided corresponding to the four sides of the CRT and attached to a casing having a frame portion having substantially the same height as the surface of the CRT screen. A dustproof panel, a surface dustproof plate having a surface larger than the opening of the frame portion and at least a portion facing the CRT screen made of a translucent material, and a frame shape on four sides of the surface dustproof plate. A gasket that is attached and abuts against the frame portion, has an outer periphery that is attached to the back surface of the surface dustproof plate and is slightly smaller than the inside of the frame of the gasket, and has an opening portion that is approximately the same size as the CRT screen. At the same time, a structural plate having an abutting portion that defines the distance between the surface dustproof plate and the CRT screen, and a structural plate attached to the rear surface of the structural plate. And a shielding material having a large deformability and a restoring force that closes the space between the sheet and the periphery of the CRT screen, and these surface dustproof plate, gasket, structural plate and shielding material can be integrally combined. Dust-proof panel characterized by that.