JP2001143635A - Beam index type cathode ray tube and method for manufacturing photodetector suitable for this cathode ray tube - Google Patents

Abstract

(57) [Problem] To provide a beam index type cathode ray tube capable of realizing highly efficient color reproduction and to provide a method for efficiently manufacturing a photodetector suitable for the cathode ray tube. SOLUTION: A color reproduction section excited and emitted by an electron beam 22, an index phosphor 20 applied on an aluminum film 18 on the surface of the color reproduction section, and an optical signal 28 reflected by the index phosphor are converted into an electric signal. A beam index type cathode ray tube having index light detecting means for accurately landing an electron beam on a color reproducing section, wherein the index light detecting means converts an optical signal generated from the index phosphor into an optical signal of a predetermined wavelength. Light collector 30 formed by mixing a fluorescent dye to be mixed with a predetermined polymer medium
a ′, a dichroic mirror 30 that is provided on the light incident surface of the light collector and reflects light of a specific wavelength and transmits other light.
c ′ and an optical sensor installed on one surface perpendicular to the light incident surface to convert an optical signal into an electrical signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a beam index type cathode ray tube capable of realizing highly efficient color reproduction and a method of efficiently manufacturing a photodetector suitable for the cathode ray tube.

[0002]

2. Description of the Related Art A beam index cathode ray tube is an apparatus for performing color selection by forming an index phosphor for generating light having a wavelength of about 420 nm in a predetermined pattern on an aluminum film of a screen. like,
On the inner surface, there is provided a screen 104 on which red, green and blue fluorescent stripes 102 are repeatedly arranged.

A black matrix 106 is formed in a space between the adjacent fluorescent stripes 102, and an index phosphor 110 is formed on the surface of the aluminum film 108.
Are formed in a constant pattern, and an electron gun 114 for scanning an electron beam 112 is provided at the neck of the cathode ray tube.
A photodetector for detecting a light signal generated from the index phosphor 110 and realizing color reproduction is installed outside the light receiving window 116 in the cone portion.

Conventionally, as a photosensor used in the photodetector, a PMT (Photo Multiplier Tube) having high sensitivity to light having a wavelength of approximately 420 nm has conventionally been used.
e) was used, but this PMT is expensive and large in size, and at present, a photosensitive diode using silicon or the like is mainly used.

[0005]

However, since a photosensitive diode generally has a very small light receiving area and a high sensitivity to light having a long wavelength, a photodetector using a photosensitive diode generally has an optical signal of about 420 nm wavelength. Is used to convert light into a long-wavelength optical signal.

Hereinafter, a conventional photodetector will be described with reference to FIG. As shown in the figure, the photodetector 118 converts an optical signal having a wavelength of approximately 420 nm generated from the index phosphor into a wavelength (600 to 900) having a good sensitivity of the photosensitive diode.
nm), and converts the converted light to a photosensitive diode using a reflection phenomenon to a photosensitive diode, and receives the transmission of the optical signal converted by the light collector 118a to convert the converted light into an electrical signal. And a light-emitting diode 118b installed on one side of the light collector 118a.
a is P which is a kind of thermoplastic having a high refractive index.
MMA (PolyMethyl Methacrylat)
e) as a medium, Hostasol Yellow 8
G, manufactured by molding a fluorescent dye such as Hostasol Yellow 3G.

The reason why the light collector 118a is made of a medium having a high refractive index and a low transmittance is that light incident through the incident surface can be emitted through one exit surface perpendicular to the incident surface. The conversion of an optical signal having a wavelength of 420 nm into an optical signal of a longer wavelength is performed by a fluorescent dye uniformly dispersed inside the light collector.

In order to reduce the light loss by increasing the reflection efficiency, the surface of the light collector 118a which is perpendicular to the incident surface is usually made of magnesium oxide (MgO) or aluminum (Al). The total reflection mirror 122 subjected to specular reflection processing is provided.

Accordingly, when the electron beam 112 is scanned on the index phosphor 110, the phosphor 110 generates an optical signal 120 having a wavelength of about 420 nm.
This signal is received by the light receiving window 11 provided in the cone of the tube.
6, after reaching the light collector 118a.
The light is converted into long-wavelength light by the fluorescent dye uniformly dispersed in the inside a. The converted light is incident on the photosensitive diode 118b, and the photosensitive diode 118b outputs an electric signal based on the converted light.

The electric signal output from the photosensitive diode 118b is then input to a controller (not shown), and the controller scans the corresponding fluorescent stripe 102 on the screen with an electron beam based on the signal to reproduce the color. Is carried out.

[0011] However, according to the conventional beam index type cathode ray tube configured as described above, approximately 420 nm is used.
After converting the light signal having the wavelength of the light into a light signal of a long wavelength (600 to 900 nm) with good sensitivity of the photosensitive diode, the reflection efficiency on the incident surface of the light collector and the surface parallel to the incident surface which is transmitted to the photosensitive diode is improved. The light receiving efficiency of the entire light collector is low because it is very low.

Therefore, the conventional beam index type cathode ray tube has a problem that color reproduction cannot be realized with high efficiency for the above-mentioned reason.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is intended to maximize the light receiving efficiency of a photodetector by increasing the reflection efficiency on an incident surface and a surface parallel to the incident surface.
It is an object of the present invention to provide a beam index type cathode ray tube capable of realizing highly efficient color reproduction.

Another object of the present invention is to provide a manufacturing method for efficiently manufacturing a photodetector suitable for the cathode ray tube.

[0015]

In order to achieve the above object, a beam index type cathode ray tube according to the present invention has a screen in which phosphors of three colors are applied in stripes on the inner surface of a screen and emits light when excited by an electron beam. A color reproduction section,
An index phosphor applied on an aluminum film provided on the surface of the color reproduction section, and a light signal reflected from the index phosphor is received and converted into an electric signal so that the electron beam can be accurately transmitted to the color reproduction section. A beam index type cathode ray tube including an index light detecting means for causing an index light to be landed, wherein the index light detecting means converts an optical signal generated from the index phosphor into an optical signal having a predetermined wavelength. A light collector formed by mixing fluorescent fuel with a predetermined polymer medium, a dichroic mirror installed on the light incident surface of the light collector and reflecting light of a specific wavelength and transmitting other light, and a light perpendicular to the light incident surface And an optical sensor installed on one side surface for converting an optical signal into an electrical signal. In addition, the index light detecting means includes:
A controller or the like for performing color reproduction by scanning the fluorescent stripe on the screen with an electron beam based on the converted electric signal is included.

According to a preferred feature of the present invention, the index light detecting means further includes a total reflection mirror on the other surface of the light collector except for the light incident surface and the adhering surface to which the light sensor is adhered. The total reflection mirror can be formed of an aluminum deposited film or a magnesium oxide deposited film.

The dichroic mirror is manufactured by repeatedly depositing zirconium dioxide and silicon dioxide on a light incident surface of a light collector at a predetermined number of times, or a surface of a glass substrate having a predetermined refractive index of zirconium dioxide and silicon dioxide. When a dichroic mirror is manufactured using a glass substrate, the glass substrate is attached to the light incident surface of the light collector with an epoxy resin adhesive having a light transmittance of 90% or more. I do.

A method of manufacturing a photodetector suitable for a beam index type cathode ray tube is to mix a fluorescent dye for converting an optical signal generated from an index phosphor into an optical signal of a predetermined wavelength into a predetermined polymer medium. After that, forming a light collecting plate by molding this, a step of manufacturing a dichroic mirror by repeatedly depositing a high refractive index material and a low refractive index material on the light incident surface of the light collecting plate a predetermined number of times, Attaching an optical sensor to one side surface perpendicular to the light incident surface of the light collector, or a fluorescent dye for converting an optical signal generated from the index phosphor into an optical signal of a predetermined wavelength. After mixing with a polymer medium, it is molded to form a light collector, and a high refractive index material and a low refractive index material are repeatedly deposited a predetermined number of times on a glass substrate to produce a dichroic mirror. Including phase and the steps of attaching the dichroic mirror to the light incident surface of the collector panel, and a step of attaching a light sensor in a vertical one surface on the light incident surface of the collector panel.

According to a preferred feature of the present invention, the method further comprises providing a total reflection mirror on the other surface of the light collector except for the light incident surface and the light sensor attachment surface of the light collector. Further provided before the deposition step, wherein the total reflection mirror is manufactured by vacuum electron beam evaporation or RF sputtering.

The high-refractive index material forming the dichroic mirror is zirconium dioxide, the low-refractive index material is silicon dioxide, and zirconium dioxide and silicon dioxide are repeatedly deposited 16 times each. Vacuum electron beam evaporation or RF sputtering is used as the evaporation method.

According to the present invention having the above-described features, a dichroic mirror having selective reflection characteristics is provided on a light incident surface of a light collector, and a dichroic mirror is provided on a surface excluding a light incident surface and a surface where a photosensitive diode is attached. Since the total reflection mirror is provided, the reflection efficiency of the light incident surface and the surface parallel to the light incident surface is improved, and the light receiving efficiency of the light collector is increased, whereby light detection can be performed satisfactorily. Therefore, the cathode ray tube of the present invention can realize highly efficient color reproduction.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings, in which a beam index type cathode ray tube and a method of manufacturing a photodetector suitable for the cathode ray tube are described.

FIG. 3 is a diagram showing a configuration of a beam index type cathode ray tube according to an embodiment of the present invention.
3 is a process chart showing a manufacturing method for manufacturing a photodetector applied to the cathode ray tube of FIG.

As shown, the cathode ray tube is provided with a screen 14 on the inner surface of which red, green and blue fluorescent stripes 12 are repeatedly arranged, and a space between the adjacent fluorescent stripes 12 is a black matrix. 16
The index phosphor 20 forms a certain pattern on the surface of the aluminum film 18.

An electron gun 24 for scanning an electron beam 22 is provided at the neck of the cathode ray tube, and a light signal 28 generated by the index phosphor 20 is detected outside the light receiving window 26 at the cone to detect color. A photodetector 30 for realizing reproduction is installed, and the photodetector 30 is largely composed of a light collector 30a and an optical sensor. As the optical sensor, for example, a photosensitive diode 30b is used.

The light collector 30a is for converting an optical signal having a wavelength of approximately 420 nm generated from the index phosphor into an optical signal having a wavelength (600 to 900 nm) having a good sensitivity of the photosensitive diode, and is refracted. PMMA (Poly M), a type of thermoplastic with a high rate
Ethyl methacrylate) as medium
Ostasol Yellow8G, Hostasol
It is manufactured by mixing and molding a fluorescent dye such as Yellow3G.

Here, the reason why the medium of the light collector is made of a substance having a high refractive index is that light in the ultraviolet region incident through the incident surface can be emitted through one exit surface perpendicular to the incident surface.

In order to enhance the efficiency of the light collector 30a, a dichroic mirror 30c is provided on the light incident surface of the light collector 30a, and the dichroic mirror 30c is provided on the other surface of the light collector except for the light incident surface and the photosensitive diode attachment surface. A total reflection mirror 30d is provided.

The dichroic mirror 30c is a light collector 30.
A high-refractive index material and a low-refractive index material are alternately deposited in a thin film on the light incident surface of a, and light of a specific wavelength is reflected and other light is transmitted therethrough. For example, titanium dioxide, zirconium dioxide or the like is mainly used, and as the low refractive index substance, silicon dioxide, aluminum trioxide or the like is mainly used.

However, in this embodiment, zirconium dioxide and silicon dioxide, which are a high refractive index material and a low refractive index material and are easily deposited and have relatively low hygroscopicity, are used, and these materials are used on the light incident surface of the light collector. It is repeatedly and alternately deposited 16 times.

Here, the reason why the number of repetitive depositions of the substance is set to 16 is that when the number of repetitions of zirconium dioxide and silicon dioxide is 16 or more, the transmittance of ultraviolet rays becomes low, and when the number of repetitions is 16 or less, This is because the reflectance of visible light is reduced.

On the other hand, the total reflection mirror 30d provided on the surface of the light collector 30a except for the incident surface of the dichroic mirror 30c and the photosensitive diode attachment surface is made of an aluminum or magnesium oxide film, and a fluorescent dye is applied to the photosensitive diode attachment surface. Photosensitive diode 30b for converting a long-wavelength optical signal generated by emitting light into an electric signal
Is attached by an epoxy resin adhesive 30e having a transmittance of 90% or more.

When the electron beam 22 is scanned on the index phosphor 20 by the cathode ray tube configured as described above, the phosphor 20 emits an optical signal 28 having a wavelength of approximately 420 nm.
Occurs, and this signal reaches the light collector 30a through the light receiving window 26 provided in the cone portion of the tube, and is converted into long-wavelength light by the fluorescent dye uniformly dispersed inside the light collector 30a. The converted light is a photosensitive diode 30b.
And the photosensitive diode 30b outputs an electrical signal based on the converted light.

The electric signal output from the photosensitive diode 30b is then input to a controller (not shown), and the controller scans the corresponding fluorescent stripe 12 on the screen with an electron beam based on the signal to reproduce the color. Is carried out.

However, in the present embodiment, since the dichroic mirror 30c and the total reflection mirror 30d for increasing the reflection efficiency are provided on the light collector 30a, the light 28 incident on the light collector 30a is reflected inside the light collector 30a. When the light is converted into long-wavelength light and reflected, the reflection efficiency increases.

Hereinafter, a method of manufacturing a photodetector suitable for the cathode ray tube configured as described above will be described.

First, H is added to a polymer (eg, PMMA) medium.
Ostasol Yellow8G, Hostasol
After mixing a fluorescent dye such as Yellow3G, the mixture is injection molded to manufacture the light collector 30a.

Next, a dichroic mirror 30c is manufactured by repeatedly depositing zirconium dioxide as a high refractive index material and silicon dioxide as a low refractive index material 16 times on the light incident surface of the light collector 30a.

Here, when depositing zirconium dioxide and silicon dioxide, a vacuum electron beam evaporation method of depositing a thin film by scanning and evaporating a high-energy electron beam on a source material, or a source material is used.
(Source) An RF sputtering method is used in which a thin film is deposited by ions by forming an RF high frequency plasma around a material.

Thereafter, an aluminum film or a magnesium oxide film is deposited on the other surface of the light collector 30a except for the light incident surface and the photosensitive diode attachment surface by the vacuum electron beam evaporation method or the RF sputtering method to form a total reflection mirror 30d. Finally, if the photosensitive diode 30b is attached to the attachment surface using an epoxy resin adhesive 30e having a transmittance of 90% or more, the manufacture of the photodetector 30 is completed.

FIGS. 5 and 6 show a method of manufacturing a beam index type cathode ray tube and a photodetector suitable for the cathode ray tube according to another embodiment of the present invention, wherein a dichroic mirror is used as a light collector. After vapor deposition on a glass substrate instead of direct vapor deposition, this is adhered to a light collector, so that FIGS.
The reliability can be improved as compared with the embodiment.
The other structure is the same as that of the embodiment shown in FIGS.

That is, the photodetector 30 'applied to the cathode ray tube of the present embodiment converts the optical signal 28 generated from the index phosphor to a wavelength (600
(-900 nm)
a ', a photosensitive diode 30b' for converting an optical signal of a long wavelength (600 to 900 nm) into an electrical signal, and a light collecting plate 30 for reflecting light of a specific wavelength and transmitting other light.
Dichroic mirror 30 provided on the light incident surface of a '
c ′, a total reflection mirror 30d ′ provided on the surface of the light collector 30a ′ excluding the light incident surface and the photosensitive diode attachment surface.
It consists of.

The light collector 30a 'is made of PMMA (Poly Methyl Methacryl), which is a kind of thermoplastic having a high refractive index, as in the embodiment shown in FIGS.
y-late) as the medium
It is manufactured by mixing and molding a fluorescent dye such as ow8G and Hostasol Yellow 3G.

In this embodiment, the dichroic mirror 30c 'is formed by repeatedly depositing zirconium dioxide and silicon dioxide 16 times on a glass substrate 32 having a refractive index of 1.5, which is easy to purchase.
Is 1 to reduce light loss to the plane perpendicular to the plane of incidence.
mm.

As described above, the dichroic mirror 30
When c 'is formed on the glass substrate 32, it has the following advantages as compared with the embodiment of FIGS.

That is, PMMA (Poly Methy)
1 Methacrylate) as a medium
0a contains a larger amount of moisture than the glass substrate 32 due to the characteristics of the material, and thus contains more residual moisture than the glass substrate 32 even after a heat treatment step for removing moisture is performed. .

However, the reliability of the dichroic mirror 30c ', that is, whether or not the bandwidth of the wavelength to be transmitted is precise depends on the dichroic mirror 30c'.
The smaller the amount of residual moisture in the substrate where c 'is formed, the better. Therefore, when the dichroic mirror 30c 'is formed on the glass substrate 32 as in the present embodiment, the reliability can be improved as compared with the embodiments of FIGS.

The dichroic mirror 30c 'thus manufactured is attached to the light incident surface of the light collector 30a' by an epoxy resin adhesive 30e 'having a transmittance of 90% or more.

The light collector 30a 'excluding the incident surface of the dichroic mirror 30c' and the surface on which the photosensitive diodes are attached.
The total reflection mirror 30d 'provided on the surface is made of an aluminum or magnesium oxide film, and the photosensitive diode 30b' is attached to the photosensitive diode attachment surface with an epoxy resin adhesive 30e 'having a transmittance of 90% or more.

When the electron beam 22 is scanned on the index phosphor 20 by the cathode ray tube thus configured, the phosphor 20 emits an optical signal 28 having a wavelength of approximately 420 nm.
Occurs, and this signal reaches the light collector 30a 'through the light receiving window 26 provided in the cone of the tube, and is converted into long-wavelength light by the fluorescent dye uniformly dispersed inside the light collector 30a'. The converted light is the photosensitive diode 3
The light is incident on Ob 'and the photosensitive diode 30b' outputs an electrical signal based on the converted light.

The electric signal output from the photosensitive diode 30b 'is then input to a controller (not shown), and the controller scans the corresponding fluorescent stripe 12 on the screen with the electron beam based on the signal. And perform color reproduction.

However, in this embodiment, the dichroic mirror 30c 'is formed on the glass substrate 32, and this glass substrate 32 is attached to the light incident surface of the light collector 30a'. The reliability of the dichroic mirror is improved as compared with the case of FIG.

Hereinafter, a method for manufacturing a photodetector suitable for the cathode ray tube configured as described above will be described.

First, a polymer (for example, PMMA) medium is
Ostasol Yellow8G, Hostasol
After mixing a fluorescent dye such as Yellow 3G, the mixture is injection-molded to manufacture the light collector 30a '.

Next, zirconium dioxide as a high refractive index substance and silicon dioxide as a low refractive index substance are applied to a glass substrate 32 having a refractive index of 1.5 and a thickness of 1 mm by vacuum electron beam evaporation or RF sputtering. Then, a dichroic mirror 30c 'is manufactured by repeatedly depositing 16 times each.

As shown in FIG. 7, the thus-produced dichroic mirror 30c 'has a characteristic in that a wavelength of approximately 420 nm transmits 98% or more, but a wavelength of 600 nm or more reflects 97% or more.

After that, the glass substrate 32 provided with the dichroic mirror 30c 'and the light collector 30a' are moved to a transmittance of 9%.
0% or more of an epoxy resin adhesive 30e ', and an aluminum film or a magnesium oxide is applied to the light incident surface and the other surface of the light collector 30a' except for the photosensitive diode attachment surface by the vacuum electron beam evaporation method or the RF sputtering method. A total reflection mirror 30d 'is provided by depositing a film, and finally, a photosensitive diode 30b' is attached to the attachment surface using an epoxy resin adhesive 30e 'having a transmittance of 90% or more to manufacture the photodetector 30. I do.

The photodetector manufactured in this manner is then placed on the outside of the light receiving window provided in the cone of the cathode ray tube with a transmittance of 9%.
An optical signal generated from the index phosphor while being attached by an epoxy resin adhesive of 0% or more is detected.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this.
Various modifications can be made within the scope of the claims, the detailed description of the invention, and the accompanying drawings, which naturally fall within the scope of the invention.

[0060]

As described above, according to the beam index type cathode ray tube of the present invention, a dichroic mirror having selective reflection characteristics is provided on the light incident surface of the light collector.
Since the total reflection mirror is provided on the surface except the light incident surface and the photosensitive diode attachment surface, the reflection efficiency on the incident surface and the surface parallel to the incident surface increases, and the light receiving efficiency of the light collector increases. Thus, light detection can be performed well.

Therefore, the beam index type cathode ray tube of the present invention can perform color reproduction with high efficiency. Further, according to the method, the light receiving efficiency is maximized, and a photodetector suitable for the cathode ray tube can be efficiently manufactured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a general beam index cathode ray tube

FIG. 2 is a cross-sectional view of a conventional photodetector.

FIG. 3 is a configuration diagram of a beam index type cathode ray tube according to an embodiment of the present invention.

4 is a process chart showing a manufacturing method for manufacturing a photodetector applied to the cathode ray tube of FIG.

FIG. 5 is a configuration diagram of a beam index type cathode ray tube according to another embodiment of the present invention.

6 is a process chart showing a manufacturing method for manufacturing a photodetector applied to the cathode ray tube of FIG.

FIG. 7 is a diagram showing a selective reflection phenomenon of a dichroic mirror applied to the embodiment of FIG.

[Explanation of symbols]

 Reference Signs List 12 fluorescent stripe 16 black matrix 18 aluminum film 20 index phosphor 22 electron beam 26 light receiving window 28 optical signal 30a light collector 30a 'light collector 30b' photosensitive diode 30c 'dichroic mirror 30d' total reflection mirror 30e 'epoxy resin adhesive 30b photosensitive Diode 30c Dichroic mirror 30d Total reflection mirror 30e Epoxy resin adhesive 32 Glass substrate

Claims (18)

[Claims] 1. A three-color phosphor is coated on an inner surface of a screen in a stripe shape, and is applied on an aluminum film provided on a surface of the color reproduction portion, which is excited by an electron beam and emits light. A beam including an index phosphor, and an index light detecting means for receiving an optical signal reflected from the index phosphor and converting the signal into an electric signal so that the electron beam can be accurately landed on the color reproduction section. An index type cathode ray tube, wherein the index light detecting means is formed by mixing a fluorescent dye for converting an optical signal generated from the index phosphor into an optical signal of a predetermined wavelength into a predetermined polymer medium. A light collecting plate; a dichroic mirror provided on a light incident surface of the light collecting plate for reflecting light of a specific wavelength and transmitting other light; Beam index type cathode ray tube and an optical sensor for converting into an electrical signal the optical signal is device perpendicular one side surface. 2. The beam index according to claim 1, wherein the index light detecting means further comprises a total reflection mirror on a surface of the light collector except for a light incident surface of the dichroic mirror and a surface on which the light sensor is adhered. Type cathode ray tube. 3. The beam index type cathode ray tube according to claim 2, wherein the total reflection mirror is made of an aluminum film deposited on the light collector. 4. The cathode ray tube according to claim 2, wherein the total reflection mirror is formed of a magnesium oxide film deposited on the light collector. 5. The beam index type cathode ray tube according to claim 1, wherein the dichroic mirror is made of zirconium dioxide and silicon dioxide repeatedly deposited a predetermined number of times on a light incident surface of the light collector. 6. The dichroic mirror comprises zirconium dioxide and silicon dioxide repeatedly deposited a predetermined number of times on a surface of a glass substrate having a predetermined refractive index.
Or the beam index type cathode ray tube according to 2. 7. The cathode ray tube according to claim 6, wherein the refractive index of the glass substrate is 1.5. 8. The beam index type cathode ray tube according to claim 6, wherein the dichroic mirror is attached to a light incident surface of the light collector by an epoxy resin adhesive having a light transmittance of 90% or more. 9. The optical sensor according to claim 1, wherein the optical sensor is attached with an epoxy resin adhesive having a light transmittance of 90% or more.
3. A beam index type cathode ray tube according to claim 1. 10. A method of mixing a fluorescent dye for converting an optical signal generated from the index phosphor into an optical signal of a predetermined wavelength into a predetermined polymer medium, and then molding the same to form a light collector. Manufacturing a dichroic mirror by repeatedly depositing a high-refractive index material and a low-refractive index material on the light incident surface of the light collector a predetermined number of times; and forming light on one surface perpendicular to the light incident surface of the light collector. Attaching a sensor. A method for manufacturing a photodetector suitable for a beam index type cathode ray tube, comprising: 11. A method of mixing a fluorescent dye for converting an optical signal generated from the index phosphor into an optical signal of a predetermined wavelength into a predetermined polymer medium, and molding the mixture to form a light collector. Manufacturing a dichroic mirror by repeatedly depositing a high refractive index material and a low refractive index material on a glass substrate a predetermined number of times; attaching the dichroic mirror to a light incident surface of the light collector; Attaching a light sensor to one surface of the light collector perpendicular to the light incident surface of the light collector, the method comprising the steps of: 12. The method according to claim 10, further comprising the step of providing a total reflection mirror on another surface of the light collector except for the light incident surface and the light sensor attachment surface of the light collector before the light sensor is attached. 12. A method for manufacturing a photodetector suitable for the beam index type cathode ray tube according to item 11. 13. The method according to claim 12, wherein the total reflection mirror is provided by a vacuum electron beam evaporation method. 14. The method according to claim 12, wherein the total reflection mirror is provided by an RF sputtering method. 15. The method according to claim 10, wherein the high-refractive-index substance is zirconium dioxide and the low-refractive-index substance is silicon dioxide. 16. The method according to claim 15, wherein the zirconium dioxide and the silicon dioxide are repeatedly deposited 16 times. 17. The method of claim 15, wherein the zirconium dioxide and the silicon dioxide are deposited by a vacuum electron beam evaporation method.
3. A method for manufacturing a photodetector suitable for a beam index type cathode ray tube according to item 1. 18. The zirconium dioxide and silicon dioxide are deposited by RF sputtering.
3. A method for manufacturing a photodetector suitable for a beam index type cathode ray tube according to item 1.