JPH0765720A - Correcting lens for forming phosphor screen pattern of color crt - Google Patents

Abstract

PURPOSE:To obtain a correcting lens for forming a high resolution phosphor screen pattern inexpensively by forming plural flat or curved faces on at least front surface or rear flat surface of a continuous lens surface having three- dimensional free curved surface. CONSTITUTION:A correcting lens 1 is made of optical plastic of high transmission, such as polymethyl methacrylate, and it has a composite of plural flat or curved faces 2 whose which inclinations in X and Y directions are different for a reference surface 1a. That is, a discontinuous lens is formed on a continuous lens three-dimensional free curved surface 1b as the reference for inclination angles. Accordingly, only one correction lens is necessary, so that a decrease in exposure accuracy due to positioning error is prevented and also the cost is largely reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a correction lens used in an exposure step when a color CRT fluorescent surface is formed by exposure and development.

[0002]

2. Description of the Related Art The structure of a color cathode ray tube will be described with reference to the drawings.

FIG. 2 shows a sectional view of the color cathode ray tube 3. The electron beam 5 emitted from the electron gun 4 is deflected by the deflection coil 6, passes through the shadow mask 7, and then reaches the fluorescent surface 3 a.

3 and 4 are enlarged views of the fluorescent surface and the shadow mask A portion in FIG. In the cathode ray tube installed in the current home television, the shadow mask 7 and the line punched in a rectangular shape through which the red, green, and blue coloring electron beams 5 emitted from the electron gun 4 pass as shown in FIG. Fluorescent bodies 3a are formed. On the other hand, in a display such as a computer terminal or a high-definition color CRT, both the phosphor 3a and the shadow mask 7 are formed in a circular shape as shown in FIG. In this type of color cathode ray tube, if the electron beam 5 does not exactly reach the position of the circular fluorescent body 3a, a correct color cannot be reproduced and color unevenness occurs.

The phosphor is formed by a photographic printing method. That is, apply a photosensitizer to the inner surface of the front panel of the cathode ray tube,
After attaching the shadow mask, expose using ultraviolet light,
A fluorescent body is formed by developing.

FIG. 5 is a sectional view of an exposure table used for forming a fluorescent body. CRT front panel 3 on top of the exposure table 8.
b is installed, and the ultraviolet rays 10 emitted from the light source 9 are made to reach the fluorescent body 3a through the shadow mask 7 for exposure.

In forming the fluorescent surface of a black matrix type color cathode ray tube, a black body is formed leaving a large number of stripe-shaped or dot-shaped holes, and stripe-shaped or dot-shaped fluorescent films are formed in the holes. .
Therefore, the positions of the hole and the phosphor film coincide with each other, but it is important to accurately position them at the electron beam projection position.

Various correction lenses are used to perform the above-mentioned alignment (registration correction), but the inclination angle θ is in two directions, the X direction and the Y direction shown in FIG.
There are a discontinuous lens 11 composed of a plurality of planes having x and θy, and a continuous lens 12 having a continuous curved surface shown in FIG. 7, both of which refract the exposure light beam and approximate the actual electron beam trajectory. Since it is for the purpose of making it, it has a very complicated surface shape.

In the color cathode-ray tube having the stripe-shaped fluorescent film shown in FIG. 3, the fluorescent film has a long belt shape in the vertical direction, and therefore the electron beam projected to emit the light is displaced in the vertical direction. No color shift will occur even if it occurs. Therefore, since only the beam deviation in the horizontal direction needs to be corrected, the degree of freedom in designing the correction lens is high. However, since the fluorescent surface cannot be arranged at a high density, high resolution cannot be obtained. For this reason, in color cathode ray tubes for computer terminals that require high resolution,
As shown in FIG. 4, a dot-shaped fluorescent film is formed.

When forming the fluorescent film of the color CRT having the dot-shaped fluorescent film, horizontal and vertical corrections must be performed at the same time, so that various correction lenses can be used to obtain the optimum correction amount. Is used.

For example, as shown in FIG. 6, a discontinuity correcting lens 12 as disclosed in Japanese Patent Publication No. 47-40983 has a plane shape and a tilt angle θx in the horizontal direction (x) and the vertical direction (y). , Θy, and is divided into a plurality of square or rectangular blocks in each direction. The correction lens 12 is installed during the exposure process in order to prevent the cross-sectional pattern of the discontinuous boundary surface of the discontinuity correction lens 12 from being exposed on the photosensitive film, which is installed inside the exposure table shown in FIG. It is swung in the x and y2 directions shown in FIG.

In the above correction lens, the length of one side of a plurality of square or rectangular blocks of the discontinuous correction lens shown in FIG. 6 is about 6 to 10 mm, and when a block of 8 mm is used, the discontinuity is discontinuous. The correction lens 12 is 400-
It will consist of as many as 500 faces. Normally, this discontinuity correction lens is formed by heating and compressing an optical plastic such as polymethylmethacrylate in a mold in which the transfer section of the square or rectangular lens surface is formed on the surface of the metal mold material. The mold is a combination of 400 to 500 metal blocks.

For the above technique, Japanese Patent Laid-Open No. 25353/1990
In a correction lens in which a plurality of strip-shaped regions are continuous in the width direction to form a discontinuous surface as disclosed in Japanese Patent Publication No. 7, the cross-sectional shape of each strip-shaped region in the longitudinal direction is relative to the lens surface. A correction lens having a surface of a straight line or a curved line forming a predetermined inclination and having a surface of a straight line in which the cross-sectional shape of each of the band-shaped regions in each width direction is substantially parallel to the lens main surface It is disclosed.

This correction lens, as shown in FIG.
A large number of glass blocks 11a to 11e forming the strip-shaped region of the discontinuity correction lens 11 are the blocks 11 in the central portion.
It has a wedge-shaped cross section in the X direction except for c, and the surface inclination angles with respect to the lens main surface 14 that is a horizontal reference surface are 13a>13b> 13c <13d <13e, and the surface inclination angles sequentially increase toward the lens periphery. It's getting bigger, X
It is symmetrical about the axis.

In the correction lens constructed as described above,
Since the strip-shaped area is continuous in the width direction with no change in inclination, the projected image of the lens on the photosensitive film is similar to the lens pattern, and the unevenness of the light amount due to the overlapping of the projected images is small, and the fluctuation given to the correction lens is small. Has the advantage of being unidirectional.

[0016]

Particularly, as the cathode ray tube is required to have a higher definition, the precision required for the exposure step when the fluorescent surface is formed by exposure and development is also increasing.

In the above-mentioned prior art, an invention was made for the purpose of improving the fluctuation of the correction lens during exposure of the photosensitive film, but two correction lenses, a discontinuous lens and a continuous lens, must be used. Of course, no consideration is given to the deterioration of the exposure accuracy due to the positioning error between them, and the manufacturing of the correction lens molding die and the accuracy of the correction lens. This problem will be described below.

FIG. 9 is a perspective view of a mold of a conventional correction lens, and it includes a plurality of square or rectangular blocks 2a.
The length of one side is about 6 to 10 mm, and when a block of 8 mm is used, the correction lens 2 is composed of 400 to 500 surfaces. One surface of the correction lens molded from this mold is, of course, equal to the size of one block of the mold, but when the resolution required for the color cathode ray tube becomes highly accurate, it will not be the same as the size of the conventional block. Realization becomes difficult. That is, when one block of the correction lens is formed by a plane, the emission directions of the exposure light rays that have passed through this one block are all the same. Therefore, it becomes impossible to control the accuracy in a portion smaller than one block. In order to deal with this, it is conceivable to reduce the size of one block, but the number of blocks forming one correction lens mold will increase.
For example, the length of one side of one block is changed from the conventional 8 mm to 2
If it is 1/4 of 4 mm, the number of blocks is four times 1600.
There are up to 2000 pieces, and it is extremely difficult to manufacture a metal mold by polishing and polishing each block with a desired inclination angle, and it takes a long manufacturing time. .

Furthermore, the continuous lens shown in FIG. 7 must be separately manufactured and used, which is a major factor that hinders improvement in the accuracy of the fluorescent dots.

Therefore, an object of the present invention is to eliminate the above-mentioned problems of the prior art, and the first object thereof is to form a fluorescent film with high accuracy for obtaining a high resolution color CRT. The second purpose is an inexpensive correction lens that integrates a discontinuous lens and a continuous lens. The second purpose is to integrate a discontinuous lens and a continuous lens that can form a fluorescent film with high precision to obtain a high-resolution color CRT. A molding die suitable for molding a modified inexpensive compensating lens, a third object is a method and apparatus for manufacturing the compensating lens molding die, and a fourth object is a molding method for the compensating lens. The purpose of No. 5 is a color CRT in which a fluorescent film is formed by using this correction lens, and the sixth purpose is a television set in which a color CRT in which a fluorescent film is formed by using this correction lens is adapted. It is to provide.

[0021]

[Means for Solving the Problems] The first purpose is (1)
In a correction lens for forming a color CRT fluorescent surface pattern, which is composed of a plurality of flat surfaces or curved surfaces having different inclinations with respect to the reference surface,
With a correction lens for forming a color CRT fluorescent surface pattern, which is characterized in that it is formed on at least one surface of a continuous lens surface having a dimensional free-form surface or a planar back surface, (2) an inclination with respect to a reference surface In a color CRT fluorescent surface pattern forming correction lens composed of a plurality of different planes or curved surfaces, the plurality of planes or curved surfaces are at least the front surface of a continuous lens surface having a three-dimensional free curved surface or the back surface of a planar surface. (3) With a correction lens for forming a color cathode ray tube fluorescent surface pattern, which is formed by using a mold formed on one surface, (3) is composed of a plurality of flat surfaces or curved surfaces having different inclinations with respect to the reference surface. In a correction lens for forming a color CRT fluorescent surface pattern, a plurality of flat surfaces having an inclination component in only one direction or Using a mold whose surface is a three-dimensional free curved surface formed on the surface of the mold material, and a mold formed on the surface of the mold material with a plurality of flat surfaces or curved surfaces having an inclination component in the direction perpendicular to the above direction, By the correction lens for forming the cathode ray tube fluorescent surface pattern of the above (2), which is characterized in that both the front and back surfaces are molded, and (4) with respect to the reference surface,
In a correction lens for forming a color CRT fluorescent surface pattern, which is composed of a plurality of flat surfaces or curved surfaces having different tilts, a mold material in which a plurality of flat surfaces or curved surfaces having a tilt component in only one direction are three-dimensional free curved surfaces The lens formed from the mold formed on the surface and the lens formed from the mold formed on the surface of the mold material having a plurality of flat surfaces or curved surfaces having a tilt component in the direction perpendicular to the above direction are bonded to each other. This is achieved by the correction lens for forming the color cathode ray tube fluorescent surface pattern of 2).

The second purpose is (5) with respect to the reference plane,
In a mold for a color CRT fluorescent surface pattern forming correction lens composed of a plurality of flat surfaces or curved surfaces having different inclinations, a punch having a single flat surface or a curved transfer surface is used for a mold material. Positioning the punch to the desired inclination and pressing it against the surface of the die material to form a plurality of flat or curved surfaces on the surface of the die material that is a three-dimensional free curved surface. Depending on the mold, and (6) in the mold of the correction lens for forming a color CRT fluorescent surface pattern, which is composed of a plurality of flat surfaces or curved surfaces having different inclinations with respect to the reference plane, a plurality of flat surfaces or curved surfaces are continuously formed. A mold for a correction lens for forming a fluorescent surface pattern of a color cathode ray tube, which is formed on the surface of a mold material having a three-dimensional free-form surface in a strip shape More is achieved.

The third purpose is (7) with respect to the reference plane,
In a mold for a correction lens for forming a color CRT fluorescent surface pattern, which is composed of a plurality of flat surfaces or curved surfaces having different tilts, a plurality of flat surfaces or curved surfaces having a tilt component in only one direction are consecutively This can be achieved by a mold of a correction lens for forming a color cathode ray tube fluorescent surface pattern, which is formed on the same mold material surface in a band shape.

The above-mentioned third object is (8) In the mold of the correction lens for forming a color CRT fluorescent surface pattern, which is composed of a plurality of planes or curved surfaces having different inclinations with respect to the reference plane, the single plane. Alternatively, a punch having a curved transfer surface is used, the punch is positioned so as to have a desired inclination with respect to the die material, and the punch is pressed against the die material surface to form a plurality of flat surfaces or curved surfaces into a three-dimensional free-form die. Color cathode ray tube to be formed on the material surface By the method and apparatus for producing a correction lens for forming a fluorescent surface pattern, and (9) a color cathode ray tube which is composed of a plurality of planes or curved surfaces having different inclinations with respect to the reference plane. In the mold of the correction lens for forming the fluorescent surface pattern, a plurality of flat surfaces or curved surfaces are continuously stripped by cutting with a cutting tool such as a diamond tool. The three-dimensional a free-form surface mold material formed on the surface of the mold of a color cathode ray tube phosphor screen pattern forming correction lens manufacturing method and processing apparatus, are achieved.

The fourth purpose is (10) with respect to the reference plane,
In a mold for a color CRT fluorescent surface pattern forming correction lens composed of a plurality of flat surfaces or curved surfaces having different inclinations, a punch having a single flat surface or a curved transfer surface is used for a mold material. Positioning the punch to the desired inclination and pressing it against the surface of the die material to form a plurality of flat or curved surfaces on the surface of the die material that is a three-dimensional free curved surface. By a method of forming a correction lens for forming a color cathode ray tube fluorescent surface pattern by heating and compressing an optical plastic such as polymethylmethacrylate in a mold or using an ultraviolet curable resin, and (11) tilting with respect to a reference plane. Color cathode ray tube fluorescent surface pattern forming correction lens mold composed of multiple flat or curved surfaces , A mold for a correction lens for forming a color cathode ray tube fluorescent surface pattern, which is formed by continuously cutting a plurality of flat surfaces or curved surfaces with a cutting tool such as a diamond tool to form a strip-shaped three-dimensional free-form surface of the mold material. This is achieved by a method of forming a correction lens for forming a color cathode ray tube fluorescent surface pattern by heating and compressing an optical plastic such as polymethylmethacrylate or using an ultraviolet curable resin.

The fifth object is achieved by (12) a cathode ray tube having a fluorescent film formed by exposure using the correction lens.

The sixth object can be achieved by (13) a monitor for a television set or a computer terminal to which the CRT is applied.

[0028]

In a correction lens for forming a color cathode ray tube fluorescent surface pattern, which is composed of a plurality of flat surfaces or curved surfaces having different inclinations with respect to the reference surface, the plurality of flat surfaces or curved surfaces are three-dimensional free-form surface mold materials. A correction lens for forming a color CRT fluorescent surface pattern is characterized by being molded using a mold formed on the surface of a conventional discontinuous lens formed from a mold combining a polished block and a three-dimensional lens. Since two lenses, which are continuous lenses having free-form surfaces, are not used, it is possible to manufacture a correction lens according to the accuracy required for the fluorescent surface pattern at low cost, and achieve high accuracy of the fluorescent surface pattern. Therefore, a high-definition color CRT can be obtained.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

Example 1. FIG. 1 is a perspective view showing the outer appearance of a correction lens according to an embodiment of the present invention.

The compensating lens 1 is made of an optical plastic such as polymethylmethacrylate having a high light transmittance, and a plurality of planes having different inclinations in the X and Y directions with respect to the reference plane 1a, or It is formed of a set of curved surfaces 2.

The correction lens shown in FIG. 1 is an integrated combination of the discontinuous lens shown in FIG. 6 and the continuous lens shown in FIG. That is, on the three-dimensional free-form surface of the continuous lens shown in FIG.
The discontinuous lens shown in FIG. In the conventional discontinuous lens of FIG. 7, the reference of the inclination angles θx and θy of a plurality of flat surfaces or curved surfaces is based on the flat surface of the lens bottom surface, whereas in the correction lens of the present invention, as shown in FIG.
The three-dimensional free curved surface 1b is used as the reference of the inclination angle.

In the correction lens of the present invention, as described above,
Since it is a single lens, the exposure accuracy does not deteriorate due to the alignment error that occurs when the conventional two correction lenses, the discontinuous lens and the continuous lens, are used, and the cost can be greatly reduced. Is. As shown in FIG. 9, a conventional correction lens is molded from a mold in which a plurality of blocks each having a plurality of flat surfaces or curved surfaces having different inclinations in the x and y directions are combined, and thus is integrated with a continuous lens. In order to manufacture a corrected correction lens, the cost for manufacturing the mold is significantly increased and the manufacturing becomes difficult. However, in the present invention, the mold used for molding the correction lens shown in FIG. Since each flat surface or curved surface is molded using a mold formed on the surface of a mold material having a three-dimensional free-form surface which is the surface shape of a continuous lens, it is possible to integrate a continuous lens and a discontinuous lens into a high An accurate correction lens can be obtained at low cost.

Next, the mold used for molding the correction lens of the present invention shown in FIG. 1 will be described.

FIG. 10 shows an embodiment of a mold processing method and a processing apparatus used for molding the correction lens of the present invention.

The mold 14 is held on a positioning table 17 which is held by an X table 15 and a Y table 16 so as to be movable in two orthogonal axis directions. A punch 18 for forming a plurality of flat surfaces or curved surfaces 2a having different inclinations with respect to the reference bottom surface 14a on the surface of the die is rotatably held by the goniometer stages 19 and 20 about the machined surface of the punch. , The goniometer stage is vertically movable Z
It is attached to the lower end of the shaft 21. The z-axis 21 is held by the column 22.

Next, the processing process of the correction lens molding die using this apparatus will be described. As the material of the punch 18, a high hardness material such as diamond, CBN, or super hard is suitable, and the shape of the surface involved in the processing of the lower end is a desired flat surface or a surface to which the curved surface 2a is transferred. Keep it. The goniometer stage 19 in the X direction and the Y direction so that the attitude of the punch with respect to the die 14 matches the inclination in the X and Y directions with respect to the reference bottom surface required for the surface to be processed.
The gonio stage 20 in each direction is positioned by a drive source such as a pulse motor. Also, the punch and the X of the die 14
Relative positioning in the -Y plane is performed by driving the X table 15 and the Y table 16. After performing this relative positioning,
The Z-axis 21 holding the punch 18 is lowered, and the surface of the die 14 is punched so that the height of the desired three-dimensional free-form surface which is the surface shape of the continuous lens at that position is punched to obtain a desired flat surface or curved surface. 2a is formed. After repeating this cycle one after another to process the mold, an optical plastic such as polymethylmethacrylate having high light transmittance described above is heated and compressed on the mold surface to mold the correction lens. It is also possible to cast an ultraviolet curable resin on the surface of the mold and irradiate it with ultraviolet rays to mold the resin.

In the mold manufactured by the above-described process, the conventional continuous lens and the discontinuous lens can be integrated by forming a desired flat surface or curved surface 2a on a three-dimensional free curved surface corresponding to the continuous lens. A highly accurate correction lens can be manufactured at low cost, and the pattern accuracy of the fluorescent film is improved, so that a high-definition CRT can be exposed.

Example 2. Further, another example of the die processing method and the processing apparatus capable of obtaining the same effect will be described.

FIG. 11 is a view showing a cutting method and a processing apparatus for the correction lens molding die of the present invention. Mold 14
Is held on a positioning table 17 which is held by the X table 15 and the Y table 16 so as to be movable in two orthogonal axis directions. The transfer surface of the above-mentioned correction lens surface shape is cut on this mold surface using a cutting tool such as a diamond tool. Diamond bite 23
Is rotatably held on the rotary table 24 with the center of the tip of the cutting edge as the center of rotation, and a cut is given to the mold 14 by the Y table 15, and the X table 1 is moved in the X direction.
5 by continuously moving the Y table 16 in the same direction in the Y direction so that the surface of the mold 14 becomes a three-dimensional free curved surface of the continuous lens and the inclination angle of the flat surface or the curved surface 2a becomes a desired value. The cutting feed is applied while the NC control is simultaneously performed on the XY two axes. Every time the cutting of one flat surface or curved surface 2a having a desired tilt angle is completed according to the position of this cutting feed, the diamond bit 23 is set to the desired tilt angle in the Y direction of the flat surface or curved surface 2a to be cut next. This is a processing method in which the posture of is sequentially changed during cutting by the rotary table 24. The cutting edge length of the diamond cutting tool 19 in the direction perpendicular to the cutting direction X may be formed to be equal to the length of one desired flat surface or one side of the curved surface 2a.

By using the above processing process,
It is possible to obtain a mold in which a plurality of flat surfaces or curved surfaces having a desired inclination angle are processed on the three-dimensional free curved surface of a continuous lens.

The correction lens of the present invention shown in FIG. 1 is formed by heating and compressing an optical plastic such as polymethylmethacrylate having a high light transmittance using the mold processed as described above. . Even if the fluorescent film was exposed using this correction lens, the same effect as in Example 1 was obtained.

FIG. 12 shows another embodiment of the correction lens of the present invention.

An optical plastic having a high light transmittance such as polymethylmethacrylate is used as a material for the correction lens 1, and a flat surface having a desired inclination angle is formed on the bottom surface 1a of a continuous lens having a three-dimensional free curved surface shape. Alternatively, it is a correction lens having a curved surface 2. In this embodiment, a discontinuous lens mold having a flat or curved surface having a desired inclination angle formed on the flat surface and a continuous lens mold having a three-dimensional free curved surface are opposed to each other to mold optical plastic. is there. It is also possible to separately manufacture the continuous lens and the discontinuous lens and adhere them to the bottom surface.

As the processing method and processing apparatus for the continuous lens and the discontinuous lens mold used in the above-mentioned embodiment, those described in detail in Embodiment 1 can be applied.

Even when the fluorescent film was exposed by using the correction lens, the same effect as in Example 1 was obtained.

Example 3. Example 1.2. An example of the use of the correction lens obtained in 1. will be described.

Conventionally, by using a correction lens in which a continuous lens having a three-dimensional free curved surface shape and a discontinuous lens composed of an assembly of planes or curved surfaces having a desired inclination angle are integrated, a fluorescent film pattern is obtained. As a result, the high-definition color CRT can be obtained.

Further, it was possible to obtain a high-definition television set equipped with the color cathode ray tube and a terminal monitor.

[0050]

According to the present invention, as described above, an inexpensive correction lens can be obtained by forming an aggregate of flat surfaces or curved surfaces constituting the correction lens surface on a three-dimensional free curved surface.
Further, a molding die suitable for molding the correction lens, a processing method and a processing apparatus for processing the mold, and a method for molding an excellent correction lens from the mold, It has become possible to obtain a high-definition color cathode ray tube in which the pattern accuracy of the fluorescent film is improved by using this correction lens, a high-definition television set in which the color cathode ray tube is installed, and a terminal monitor.

[Brief description of drawings]

FIG. 1 is a perspective view showing the outer appearance of a correction lens according to one example of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a color CRT.

FIG. 3 is an enlarged view of a fluorescent surface and a shadow mask portion.

FIG. 4 is an enlarged view of a fluorescent surface and a shadow mask portion.

FIG. 5 is a cross-sectional view of a fluorescent substance forming exposure base.

FIG. 6 is a perspective view of a discontinuous lens.

FIG. 7 is a perspective view of a continuous lens.

FIG. 8 is a perspective view of a conventional correction lens.

FIG. 9 is a perspective view of a conventional correction lens mold.

FIG. 10 is a perspective view of an embodiment of a correction lens mold processing method and a processing apparatus of the present invention.

FIG. 11 is a perspective view of a method of cutting a correction lens mold and a cutting device according to an embodiment of the present invention.

FIG. 12 is a perspective view showing the outer appearance of a correction lens according to one example of the present invention.

[Explanation of symbols]

 1 ... Correction lens, 14 ... Correction lens mold, 18 ... Punch, 19, 20 ... Goniometer stage, 23 ... Diamond bite.

Claims (12)

[Claims] 1. A correction lens for forming a color CRT fluorescent surface pattern, comprising a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, wherein the plurality of flat surfaces or curved surfaces have a three-dimensional free curved surface. A correction lens for forming a color cathode ray tube fluorescent surface pattern, which is formed on at least one surface of a continuous lens surface or a planar back surface. 2. A color CRT fluorescent surface pattern forming correction lens composed of a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, wherein the plurality of flat surfaces or curved surfaces have a three-dimensional free curved surface. A correction lens for forming a color CRT fluorescent surface pattern, which is formed by using a mold formed on at least one surface of a continuous lens surface or a planar back surface. 3. A correction lens for forming a color CRT fluorescent surface pattern, comprising a plurality of flat surfaces or curved surfaces having different tilts with respect to a reference surface, wherein the plurality of flat surfaces or curved surfaces have a tilt component in only one direction. Using a mold formed on the surface of the mold material that is a three-dimensional free-form surface and a mold formed on the surface of the mold material with a plurality of flat surfaces or curved surfaces having an inclination component in the direction perpendicular to the above direction. The correction lens for forming a color cathode ray tube fluorescent surface pattern according to claim 2, wherein both surfaces are molded. 4. A color CRT fluorescent surface pattern forming correction lens composed of a plurality of planes or curved surfaces having different inclinations with respect to a reference plane, wherein a plurality of planes or curved surfaces having a tilt component in only one direction. Molded from a mold formed on the surface of the mold material which is a three-dimensional free-form surface, and a mold formed on the surface of the mold material with a plurality of flat surfaces or curved surfaces having a tilt component in the direction perpendicular to the above direction. 2. The correction lens for forming a color cathode ray tube fluorescent surface pattern according to claim 1, wherein the correction lens is attached. 5. A mold for a correction lens for forming a color cathode ray tube fluorescent surface pattern, comprising a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, and having a single flat surface or a curved transfer surface. Using a punch, position the punch with respect to the mold material so that it has a desired inclination, and press it against the mold material surface to form multiple flat or curved surfaces.
A method of manufacturing a mold for a correction lens for forming a fluorescent surface pattern of a color cathode ray tube, which is characterized in that it is formed on the surface of a mold material which is a three-dimensional free-form surface. 6. A mold of a correction lens for forming a color cathode ray tube fluorescent surface pattern, which comprises a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, having a single flat surface or a curved transfer surface. Using a punch, position the punch with respect to the mold material so that it has a desired inclination, and press it against the mold material surface to form multiple flat or curved surfaces.
A correction lens mold for forming a color cathode ray tube fluorescent surface pattern, which is formed on the surface of a mold material that is a three-dimensional free-form surface. 7. A mold of a correction lens for forming a color CRT fluorescent surface pattern, which comprises a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, having a single flat surface or a curved transfer surface. Using a punch, position the punch with respect to the mold material so that it has a desired inclination, and press it against the mold material surface to form multiple flat or curved surfaces.
The optical plastic such as polymethylmethacrylate is heat-compressed and molded in a mold of a correction lens for forming a color CRT fluorescent surface pattern formed on the surface of the mold material which is a three-dimensional free-form surface. A method for forming a correction lens for forming a fluorescent surface pattern of a color cathode ray tube as described. 8. A mold for a correction lens for forming a color cathode ray tube fluorescent surface pattern, comprising a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, wherein the plurality of flat surfaces or curved surfaces are formed by a diamond tool or the like. A method of manufacturing a mold for a correction lens for forming a color cathode ray tube fluorescent surface pattern, which comprises continuously forming a band-shaped three-dimensional free-form surface of a mold material by cutting with a cutting tool. 9. A mold for a correction lens for forming a color cathode ray tube fluorescent surface pattern, comprising a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, wherein the plurality of flat surfaces or curved surfaces are continuously formed. A mold for a correction lens for forming a fluorescent surface pattern of a color cathode ray tube, which is formed on a surface of a mold material having a three-dimensional free-form surface in a strip shape of a book. 10. A mold for a correction lens for forming a color CRT fluorescent surface pattern, comprising a plurality of flat surfaces or curved surfaces having different inclinations with respect to a reference surface, wherein the plurality of flat surfaces or curved surfaces are formed by a diamond tool or the like. An optical plastic such as polymethylmethacrylate is heated and compressed in the mold of the correction lens for forming the color cathode ray tube fluorescent surface pattern, which is formed on the surface of the mold material that is a three-dimensional free-form surface in a continuous strip by cutting with a cutting tool. Or a method of molding a correction lens for forming a color cathode ray tube fluorescent surface pattern, which is characterized by being molded using an ultraviolet curable resin. 11. A color cathode-ray tube, wherein a fluorescent film is formed by using the correction lens according to claim 1. 12. A television set to which the color cathode ray tube according to claim 10 is applied.