JPH0121332Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a CRT display device, and more particularly to the structure of a front panel made of a transparent or colored member with high light transmittance that is placed in front of the display surface of the CRT and displays fixed information.

Generally, in display devices using CRTs, it is necessary to display various types of fixed information, such as scales and various figures, superimposed on the information displayed on the CRT. A panel made of a highly colored material such as plastic is placed, the shape of the fixed information required is engraved on the surface facing the CRT using an engraving machine, and phosphorescent paint is applied to the engraved grooves. The structure is designed to be filled with mounds. However, panels with such a structure have a durability problem in that their brightness gradually decreases over time, and they also have the disadvantage that high brightness cannot be obtained with phosphorescent paints.

An object of the present invention is to provide a light-emitting display panel for a CRT display device that exhibits almost no deterioration in brightness over time and can provide uniform and high brightness.

The light-emitting display panel of the present invention is a light-emitting display panel that is placed in front of the display surface of a CRT and displays fixed information, and includes a panel made of a transparent or colored material with high light transmittance that is placed in front of the display surface of the CRT; Optical fibers adhesively arranged on the CRT-facing surface of the panel so as to form fixed information by a sheath material layer removal section in which the entire circumference of the sheath material layer is removed in a predetermined width in the axial direction and approximately perpendicular to the axis. and a light source disposed at one end or both ends of the optical fiber.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 5 are diagrams showing examples of the light emitting display panel according to the present invention, and Figure 1 shows the length of linear light emission (hereinafter referred to as line scale).
Figure 2 shows an example of a structure in which optical fibers are arranged horizontally and bundled by the length of the line scale.
FIG. 3 is a sectional view of a portion indicated by a - line in the figure. 1st
In the figures and FIG. 3, reference numeral 1 denotes a front panel made of a transparent or colored material with high light transmittance, such as plastic or glass, placed in front of the display surface 11 of the CRT 10, and facing the CRT 10 of the front panel 1. The optical fiber 2 from which the sheath material layer at the position where light should be emitted is removed is placed on the surface where light is to be emitted.
Optical fiber bands 20 are fixedly arranged in parallel in a number equal to the length of the line scale 3 in close contact with each other. As shown in FIG. 3, the length of the optical fiber band 20 for emitting light in a linear manner, that is, the linear scale 3, is the entire length of the sheath material layer 4 at the location corresponding to the linear scale 3 of the optical fibers 2 constituting the band 20. It is formed by peeling off the periphery by a predetermined width in the axial direction and approximately perpendicular to the axis to expose the core material 5. The sheath material layer 4 can be peeled off by cutting only the sheath material layer 4 around the entire circumference approximately at right angles to the axis using a sharp knife or the like, or by leaving the area to be peeled off. Others may be coated as appropriate and removed by dissolving the exposed sheath material layer 4 using a solvent. One end 21 of the optical fiber band 20 fixed to the front panel 1 is
It is led out from the front panel 1 and fixed with its end surface 22 facing the light source 25 .
Note that the end surface 24 of the other end 23 of the optical fiber band 20 is
Black paint is applied to prevent light from leaking.
As the light source 25, it is preferable to use a miniature bulb that lights up at a relatively low voltage. A light introducing section 30 consisting of the light source 25 and the end surface 22 of the optical fiber band 20 is housed in a lamp house 32 formed in a frame 31 into which the front panel 1 is fitted. The light source 25 may be fixed within the lamp house 32 and electricity may be supplied to the light source 25 by providing wiring that passes through the frame 31; however, in this embodiment, a printed wiring board 33 having the same shape as the frame 31 is used. Create wiring 3 for light source 25
4 so that it can be connected to an external power source via this printed wiring board 33. Since the light source 25 is mounted on the printed wiring board 33, even when a large number of light sources 25 are provided, the wiring 34
can be formed in an orderly manner. Optical fiber band 20
An efficient method for forming the optical fiber band 20 is to use a flat bottom mold made to match the final shape of the optical fiber band 20 and an upper mold that fits into the lower mold. First, the optical fibers 2 from which the sheath material layer 4 at the position forming the line scale has been peeled off are arranged in a lower mold and aligned so that the line scale has the desired shape. The adhesive is applied, an upper mold is placed over the adhesive, pressure is applied to harden the adhesive, the adhesive is removed from the mold, and the adhesive is adhered to a predetermined position on the front panel 1 using a colorless and transparent adhesive. The adhesive used for molding the optical fiber band 20 and adhering it to the front panel 1 is preferably one that does not damage the optical fibers 2 and is colorless and transparent.

Next, other embodiments of the present invention will be described using FIGS. 4 and 5. FIG. 4 shows an embodiment in which optical fibers are arranged in the length direction of a linear scale, and FIG. 5 is a cross-sectional view of the portion indicated by a - line in FIG. 4. In these figures, the same or equivalent parts as in FIGS. 1 to 3 are designated by the same reference numerals, and the explanation thereof will be omitted.

This embodiment differs from the previous embodiment in that each line scale 3' is formed by one optical fiber 2, and one end 21 of the optical fiber 2 fixed at a predetermined position on the front panel 1 is attached to the front panel 1. The lamps are led out from the panel 1, bundled into appropriate numbers, and fixed to the light source 25 in the lamp house 32 formed in the frame 31 with the end faces 22 facing each other. The shape of the line scale that can be formed in this embodiment is relatively simple compared to the previous embodiments.

Next, specific examples of the present invention will be described below.

Optical fibers are made by coating a plastic core material with 15 micron thick plastic resin and cutting them into lengths of approximately 10 cm each, each with a diameter of 0.25 mm. Cuts were made with a sharp knife around the entire circumference at approximately right angles to the center, and then peeled off to expose the core material. The six optical fibers prepared in this way were put into a mold made in the final shape of the optical fibers, and after matching the line scale parts, a colorless and transparent one-component epoxy resin adhesive was cut onto the optical fibers. Hi-Super (trade name) from Cemedine Co., Ltd. was applied to a thickness of approximately 50 microns, an upper mold was placed over it, and a weight of 11.34 kg was applied to allow natural curing (24 hours). After curing, the optical fiber strip taken out from the mold is 2 mm thick x 139 mm long x wide.
It was attached to a front panel made of a 173 mm transparent acrylic resin plate using the same adhesive as above. When a 28V, 24mA miniature bulb was used as a light source, the average luminance on the line scale was 1.0 foot lambert.

As is clear from the above description, the light-emitting display panel of the present invention uses optical fibers for the line scale that emits light, and the entire circumference of the sheath material layer of the optical fibers is formed with a predetermined width in the axial direction and centered on the axis. Since the sheath material layer removed portion removed at a substantially right angle to the panel was adhesively arranged on the CRT facing surface of the panel so as to form fixed information,
Compared to display panels filled with conventional phosphorescent paint, there is almost no deterioration of luminance over time, and a uniform, high-luminance line scale with clear line width can be obtained.

Note that the application of the present invention is not limited to CRT display devices, but can be used for various displays that require a light-emitting display such as a line scale on the front panel.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the light emitting display panel according to the present invention, and FIG. 2 is the same as that shown in FIG. 1.
3 is an enlarged view of the line scale portion provided on the optical fiber; FIG. 4 is a partially cutaway side view showing another embodiment of the light emitting display panel according to the present invention; FIG. FIG. 5 is a cross-sectional view of the portion indicated by a - line in FIG. 4. 1...Front panel, 2...Optical fiber, 3,
3'...Line scale, 10...CRT, 11...
CRT display surface, 20... optical fiber body, 25... light source, 31... frame body, 32... lamp house.

Claims (1)

[Scope of utility model registration request] In a light-emitting display panel that is placed in front of the display surface of a CRT and displays fixed information, a panel made of a transparent or colored material with high light transmittance placed in front of the display surface of the CRT and the entire circumference of the sheath material layer are aligned in the axial direction. an optical fiber adhesively arranged on the CRT-facing surface of the panel so as to form fixed information by a sheath material layer removed portion removed with a predetermined width and substantially perpendicular to the axis;
A light emitting display panel comprising a light source disposed at one end or both ends of the optical fiber.