JPS59165006A - Production of optical fiber plate - Google Patents

Abstract

PURPOSE:To make pressure uniform on a border between a press plate and optical fibers and to form an optical fiber plate reducing at its image bent by pressing and melting a layer consisting of globular materials with heat. CONSTITUTION:The inside of a frame body 4 is most tightly charged with optical fibers 2 by laminating the fibers 2, the upper part of the optical fibers 2 is most tightly packed with globular material 6 having soft adhering temperature slightly lower than a temperature (soft melting temperature) properly deforming and melting the fibers 2 with proper pressure through a peeling-off foil 5 and the press plate 3 is put on the material 6. The part prepared by said procedure is heated in a vacuum heating furnace up to the soft melting temperature of the material 6 and the plate 3 is pressed with pressure P. Since the layer of the material 6 is thermally deformed gradually from the center part of the frame body 4 to the periphery, uniform pressure is applied to the whole layer of the fibers 2. At that time or after the time, the fibers 2 also are heated up to the soft melting temperature press-contacting and deforming the fibers 2 with heat, so that thermal deformation is uniform. Therefore, the optical fiber plate block is improved at its quality by reducing image bending distortion.

Description

[Detailed description of the invention] Regarding the method.

Conventionally, optical fiber plates have been mainly used in the face plates of cathode ray tubes, and are used to faithfully extract image information from the front surface of the cathode ray tube. Therefore,
The required functions for optical fiber plates include good vacuum tightness when the direction of image information transmission is constant and insulation against high pressure. In order for the transmission direction of an optical fiber plate to be constant, the individual optical fibers that make up the optical fiber plate must be arranged in a regular geometric manner and stacked. That is,
There is a tendency for fiber recording tubes (also abbreviated as FOT) to become longer and longer, and there are many technical difficulties in manufacturing optical fiber plates that satisfy the above-mentioned functions.

In particular, Figure 1 and Figure 1! To explain this with reference to the diagram:
In the conventional manufacturing method of optical fiber plate,
The optical fiber plate block 2' after thermo-compression bonding of the optical fiber parts inside the frame body is shown in FIG.
That is, it is three-dimensionally curved. Even if this optical fiber plate block 3' is sliced into an optical fiber plate, a similar curvature occurs.

Therefore, when this optical fiber plate was used as a component of an FOT, faithful image information could not be obtained. This curvature is caused by the fact that the force applied to the layer of optical fiber 3 is high at the center and low at the periphery, as shown in FIG.
1. l! The present invention has been made in view of the above points and in order to eliminate the above drawbacks.The present invention has been made in order to eliminate the above drawbacks.The present invention is made by using a spherical material to uniformize the pressure applied to the optical fiber layer and fuse it. An object of the present invention is to provide a method for manufacturing an optical fiber plate that enables reduction of image curvature.

Hereinafter, an embodiment of the method for manufacturing an optical fiber plate according to the present invention will be described with reference to drawing π.

FIG. 3 is an explanatory diagram of an embodiment of the method for manufacturing an optical fiber plate according to the present invention. Optical fibers 2 are stacked in the frame body in a most densely packed manner to form a layer of optical fibers 2.

On top of this layer, a spherical material B having a softening temperature slightly lower than the optical fiber temperature (hereinafter referred to as the optical fiber temperature) is laminated in a close-packed manner via the peeling edge j, and a push plate 3 is placed on top of this.

Note that the peeling 1'i [c foil j has a high melting point, functions as a boundary between the layer of optical fiber 2 and the layer of spherical material B even under heating, and is easy to peel off from the mold after molding. good.

When the whole is heated to a predetermined temperature in a vacuum heating furnace (not shown) to a degree of soft melting of the spherical material (i'a), a pressure P is applied to it by means 1 (not shown) through a pushing plate 3. It is applied to the layer of spherical material and the layer of optical fiber 3.

From this point on, the layer of the spherical material whose voids are relatively larger than the layer of optical fibers and whose degree of free deformation is correspondingly greater, gradually spreads from the center of the frame to the periphery. Optical fiber 2 as it causes thermal deformation.
The layer is uniform throughout (IIE).

Power will be given to you. Exactly at this time or after this,
Since the layer of optical fiber 2 is also heated to a soft melting temperature at which it is deformed by thermocompression, the layer of optical fibers subjected to this uniform pressure is uniformly deformed by thermocompression. As a result, the optical fiber plate block manufactured by cooling and solidifying after vacuum thermocompression bonding is of high quality with less image curvature distortion9.The optical fiber plate block manufactured by slicing and polishing this The plate will be of good quality with little image curvature distortion.

FIG. 9 is a diagram showing another embodiment in which the method for manufacturing an optical fiber plate according to the present invention is applied to a sandwich-type optical fiber plate. A glass flat plate 2 made of the same material as the structure of the cathode ray tube is arranged in the frame 14, optical fiber parts are stacked on top of this in a close-packed manner, and a glass flat plate g made of the same material as the glass flat plate 2 is further placed. Place on top to form a sandwich-shaped structure. Further, the spherical material B is packed close-packed and laminated on top of this glass flat plate through the peeled edge S. The melting temperature of the spherical material 6 is also set slightly lower than that of the optical fiber 2. Then, a push plate 3 is placed on top of this spherical material, layer B. After heating in a vacuum heating furnace (not shown) and reaching a predetermined accuracy, when pressure P is applied to the push plate 3, it does not break as described above.
The layer of spherical material B undergoes thermal deformation under pressure and is passed through a flat glass plate into optical fiber! Apply even pressure to the first layer. Therefore, from this point on, the layer of optical fiber 3 also undergoes uniform thermal deformation due to heat and uniform pressure.

However, since the melting temperature of the glass plane plate 9 is relatively higher than that of the optical fiber 3, no additional thermal deformation occurs. When this is cooled and solidified, an optical fiber grate block that is uniformly deformed by thermocompression is obtained, and the optical fiber plate obtained by slicing and polishing this is a high quality one with no bending distortion. . Note that the pressure may be applied from the beginning before heating, or the pressure may be applied at a point close to the melting temperature of the spherical material.

Furthermore, in the embodiments shown in FIGS. 3 and 9, even if the melting temperature of the spherical material is set higher than that of the optical fiber, an optical fiber plate with almost no image curvature can be obtained. It will be done.

For example, in this case, as shown in FIG. 3, a pressure plate provided with a peeling tube is interposed between the layer of spherical material and the layer of optical fiber.

When the temperature is increased in a vacuum furnace, the thermal ν elongation of the frame is generally larger and the close-packing of the spherical material is disrupted.

. . At that time, Eka P was pressed, board and board 7 balls, cedar material, ;ka [
1) Uniform pressure is applied to the pressure plate between the layer of spherical material and the layer of optical fibers, so the layer of optical fibers being heated is uniformly deformed while being subjected to uniform pressure by the pressure plate. Therefore, uniform optical fiber plates can be obtained. In the case of the method of manufacturing a sandwich-type optical fiber plate shown in FIG. 9, a pressed glass flat plate plays the role instead of the pressure plate, so the pressure plate is a subfigure. -Although not mentioned in all of the above embodiments as it is obvious, the frame and the push plate are also made of spherical materials, optical fibers, etc., and release tubes with good mold release properties, such as mica, graphite, 513N4, etc.
A heat-resistant sheet or the like is provided. Of course, it is also possible to provide a peeling tube made of stainless steel or the like, which will stick to the spherical material, optical fiber, etc., but will not stick to the frame or pusher plate. - The optical fiber may be a single optical fiber consisting of a core and a cladding, or may be a multi-optical fiber. Further, although the shape of the optical fiber in the direction perpendicular to the longitudinal direction is shown as a circle in the figure, it may be a square, a hexagon, or other shapes.

Further, in the above embodiments, heat and pressure bonding was carried out in a vacuum furnace, but it goes without saying that heat and pressure bonding may be carried out in a general heating furnace without being in a vacuum.

As explained above, by using vacuum thermal adhesion to form a layer of spherical material, the non-uniform pressure that conventionally occurs at the boundary between the push plate and the optical fiber layer can be alleviated, resulting in an excellent product with less image curvature. This has the effect of making it easier to manufacture optical fiber plates.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a conventional optical fiber plate in a thermocompression bonded state, FIG. 3 is an explanatory diagram showing the pressure distribution applied to one layer of optical fiber during thermocompression bonding shown in FIG. FIG. 1/i: A vertical cross-sectional view showing the thermocompression-bonded state of the optical fiber plate according to the present invention. FIG. 9 is a vertical cross-sectional view showing the thermocompression-bonded state of the sandwich-inch optical fiber plate according to the present invention. 1.47 is a frame body, 2 is an optical fiber, 6 is a push plate, 5 is a peeling tube, 6 is a spherical material, 8 and 9 are glass r flat plates. Figure 1 P Figure 3 Figure 2 Pressure Figure 4 ρ

Claims (2)

[Claims] (1) In a method of manufacturing an optical fiber plate by thermocompression-bonding a layer of optical fiber by heating and pressurizing the layer, a pressing plate for pressurizing the layer of optical fiber; A layer of spherical material made of a large number of spherical materials is interposed between the layer of optical fiber, and the layer of optical fiber is applied to the pressing plate through the layer of spherical material.
A method for manufacturing an optical fiber plate with almost no image curvature, which is characterized by applying pressure with uniform pressure distribution. (2) The method for manufacturing an optical fiber plate according to claim 1, wherein the fusion temperature of the spherical material is slightly lower than the fusion temperature of the optical fiber.