JPS61290628A - Manufacture of cathode-ray tube - Google Patents

Abstract

PURPOSE:To improve the cutting efficiency thus to confirm correct cutting by employing proper cutting order while cutting matching marks at start and end of cutting. CONSTITUTION:First to fourth borders for classifying four zigzag patterns H+-V- constituting a deflection electrode are formed alternately in the opposite axial directions Z of tube. Consequently, useless motion of glass bulb can be reduced to improve the cutting efficiency. While matching marks MA are cut at start and end of cutting. As a result, correct cutting can be confirmed through matching of said marks.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a cathode ray tube having four zigzag pattern deflection electrodes patterned by laser cutting and deposited on the inner surface of the bulb.

[Summary of the invention]

The present invention improves cutting efficiency by appropriately arranging the cutting order in a method for manufacturing a cathode ray tube having four zigzag pattern deflection electrodes that are patterned by laser cutting and adhered to the inner surface of the bulb. By cutting the alignment mark twice at the beginning and end, it is possible to easily check whether the cutting has been performed correctly.

[Conventional technology]

FIG. 3 shows an example of an electrostatic focusing/electrostatic deflection type (hereinafter referred to as RS/S type) image pickup tube.

In the figure, (1) is the glass pulp, (2) is the face plate, (3) is the target surface (photoelectric conversion surface), (
4) is indium for cold sealing, and (5) is a metal ring. For example, a bias voltage of +50ν is applied to the target surface (3).

Further, (6) is a signal extraction electrode which penetrates the face plate (2) and comes into contact with the target (3).

Moreover, G6 is a mesh-like electrode and is attached to a mesh holder (7). This electrode G6 is connected to a metal ring (5) via a mesh holder (7) and indium (4).
). Then, a predetermined voltage, for example +50V, is applied to the electrode G@ via this metal ring (5).

Further, K, Gl and G2 are a cathode, a first grid electrode and a second grid electrode, respectively, which constitute an electron gun.

For example, +4v and +309 are applied to electrodes 01 and G2, respectively.
is applied. (8) is a bead glass for fixing these, and LA is a beam limiting aperture.

Further, G3, G→, and G5 are the third, fourth, and fifth grid electrodes, respectively. These electrodes 03 to G5 are formed into a predetermined pattern by laser cutting after metal such as chromium or nickel is vapor-deposited on the inner surface of the glass bulb (1). These electrodes G3 to G5 constitute an electrode system for focusing, and G4 is also an electrode for deflection.

These electrodes 63 to G6 are formed as shown in a developed view in FIG. In order to simplify the drawing, in FIG. 4, the portions on which metal is not deposited are indicated by black lines. That is, the electrode G4 has four insulated and intricate electrode parts H+ and H-.

(2) It is a so-called arrow pattern in which + and V- are arranged alternately. In this case, the leads (12H+) to (12V-) from the electrode parts I4◆ to V1 are connected to the electrodes 03 to G.
6 is similarly formed on the inner surface of the glass bulb (1). These leads (12n+ > ~ (12
L) is insulated from the electrode 03 and is formed parallel to and across the tube axis. Lead (1-2B+) ~(
12V-), a wide contact portion CT is formed at the tip thereof.

In FIG. 4, Gi is an electrode connected to the mesh electrode G6, which is similarly formed on the inner surface of the glass bulb (1) at the same time as the electrodes t4i03 to G5 are formed. Further, SL is a slit provided so as not to heat electrode G3 when heating electrodes Gi and G2 from outside the tube for evacuation, and MA is a mark for adjusting the angle with the 1h1 plate.

Returning to Figure 3, one end of (13) is the stem pin (1
4), and the other end of this spring (13) is connected to the above-mentioned lead (12fl).
+ ) ”' (12V-) (D:J 7 tact part C
T is made to touch. This spring and stem pin! J-F (1211+) ~ (12V-)
2 and 3 are provided respectively. A horizontal deflection voltage that changes symmetrically around a predetermined voltage, e.g. is applied, and also to the electrode parts V+ and ■-,
Changes symmetrically around a predetermined voltage, for example +13V!
r! A direct deflection voltage is applied.

Further, (15) indicates a contactor spring whose one end is connected to the stem pin (16), and the other end of this spring (15) is made to contact the above-mentioned electrode G3. A predetermined voltage, for example +50, is applied to the electrode G3 via this stem pin (16) and spring (15).
0v is applied.

Further, the electrode Gs is connected to an electrode pin (19) sealed, for example, to a hole (17) made in the side surface of the glass bulb (1) using frit glass (18).

A predetermined voltage, for example +500v, is applied to the electrode G5 via this electrode pin (19).

In FIG. 5, what is shown by broken lines is the equipotential surface of the electrostatic lens formed by the electrodes 63 to Gs, and the electron beam Bta is focused by the electrostatic lens formed by these lenses. Then, the landing error is corrected by the electrostatic lens formed between the electrodes G6 and G06. Furthermore, this fifth
In the figure, the potential indicated by the broken line is the potential excluding the deflection electric field E due to the electrode G4. Also, electron beam BII
The deflection is performed by a deflection electric field E generated by the electric field FhG4.

FIG. 6 is a schematic diagram of an apparatus for cutting metal deposited on the inner surface of a glass bulb (1) with a laser to form electrodes 03 to Gt in a predetermined pattern.

In the figure, (1) is a glass bulb, and (1a)
is a part on which metal, such as chromium, is vapor-deposited.

A glass bulb (1) is sandwiched between chucking heads (21) and (22). -Head (21).

(22) is rotatable and is rotated by a pulse motor (23), which causes the glass bulb (1) to rotate.
The position in the rotation direction (radial direction) θ is controlled, and the heads (21) and (22) are made into arch parts that move in the tube axis direction Z direction, and are moved by a pulse motor (24), thereby moving the glass bulb. (The position of 11 in the tube axis direction Z is controlled.

Further, (25) is a laser, for example a YAG laser, which is fixed at a fixed position. Laser light (26) from this laser (25) is focused by a lens (27) and irradiated onto the chromium-deposited portion (1a) of the glass bulb (1).

Also, (28) is the CPU, (29) is the ROM, and R
In the OM (29), cant data, that is, position data of the portion to be cut in the tube axis direction 2 and the radial direction θ is written in advance. FIG. 7 shows the memory map of this ROM (29), and its predetermined addresses contain T mark data (mark MA data), ring cut data (
data on the boundary between electrodes G4 and G5 and the boundary between electrode 65 and G), contactor data (lead (1211+)
~(12V-) and data of contact portion CT), data of arrow patterns ■, ■, ■', ■ (data of boundary of electrode portion I (and ~V-1) are written. Arrow patterns ■, ■ , ■', and ■ are the data of the portions corresponding to the boundaries ■, ■, ■', and ■, respectively, as shown in FIG.

The position data of the ROM (29) is supplied to the CPU (28), and from this cpυ (28), the position data is sent to the above-mentioned pulse motors (23) and (24) via the input/output capo (30). Corresponding control signals S1 and S2 are supplied to control the pulse motors (23) and (24).

Then, the position of the glass bulb (1) in the tube axis direction 2 and the position in the radial direction θ are controlled according to the position data.

As a result, the irradiation position of the laser beam (26) is sequentially changed according to the position data, and a predetermined pattern of '4 poles is formed as shown in FIG.
) through the input/output boat (30) to the laser (25)
A control signal is supplied to the laser beam (26) to control the generation of the laser beam (26).

[Problem that the invention seeks to solve]

By the way, conventionally, all of the four boundaries of electrode parts H10 to H1 are cut from one direction in the tube axis direction Z to another direction, for example, from the electrode G6 side to the electrode G3 side. being done.

Therefore, it is necessary to move the glass bulb (1) largely in the tube axis direction 2 between the end of cutting one boundary and the cutting of another boundary, which deteriorates cutting efficiency.

Also, conventionally, ■ and ■' of the four boundaries of electrode parts H10 to H1
The parts are treated as separate parts, and as shown in Figure 7, the position data corresponding to each part is stored in the ROM (29).
written and used.

The position data of the portions ■ and ■' are, for example, 1 in the radial direction θ.
This is data indicating how many points (one point is, for example, 10 μa+) changes in the tube axis direction 2 for a change in point (180″1500 = 0.36°), and l data is written in one byte. The portions (2) and (2) are so-called trapezoidal cuts, so the angle is less than 180°, and the position data of these portions is approximately 500 data each, resulting in a data amount of approximately 500 bytes.

Therefore, the amount of data written to the ROM (29) is large, and therefore a ROM (29) with a large capacity must be used. For example, in the past, the total amount of data was more than 2 bytes, and there was an inconvenience that commercially available 2 byte ROMs could not be used.

In view of this point, the present invention is intended to particularly improve cutting efficiency.

[Means for solving problems]

According to the present invention, the first and third boundaries separating the four zigzag patterns H+ to V- constituting the deflection electrode are aligned in the tube axis direction.
As well as cutting from one direction to the other,
The second and fourth boundaries are cut from the other direction of the tube axis 2 toward one direction. Further, the alignment mark MA is cut twice at the beginning and end of cutting.

[Effect]

Since the first to fourth boundaries separating the four zigzag patterns H1 to H2 are alternately formed in the direction 2 of the tube axis and in the other directions, unnecessary movement of the glass pulp can be reduced. Increases cutting efficiency. Further, positioning marks are cut twice at the beginning and end of cutting, and it is possible to confirm whether or not cutting has been performed correctly by checking whether the marks match or do not match.

〔Example〕

An embodiment of the present invention will be described below.

This example is also an example in which the present invention is applied to an S-S type image pickup tube as shown in FIG.

In this example as well, an apparatus as shown in FIG. 6 is used to cut the metal deposited on the inner surface of the glass pulp (1) with a laser to form the electrodes 63 to GJ in a predetermined pattern.

However, in this example, the order of cutting the boundaries of electrode parts H1 to H1 is different from the conventional one. Also,
Mark MA is cut twice at the beginning and end of cutting. Furthermore, common data is used for the portions 2 and 2' at the boundaries of the electrode portions H+ to V1, since they are symmetrical with respect to the radial direction θ. FIG. 2 shows the memory map of the ROM (29) in this example, and the predetermined addresses contain T mark data A (data of "" among marks MA), ring cut data, Data, slit data (slit SL data)
, T mark data B (data of [] among marks MA), arrow pattern ■.

■,■ data are written.

In this example, cutting is performed according to the flowchart shown in FIG. 1 under the control of the CPU (28).

This will be explained below with reference to FIGS. 4 and 8.

First, based on the T mark data A of RoM (29),
The "" part of the mark MA is cut (T mark cut on one side).

Next, based on the ring cant data in the ROM (29), the boundaries between the electrodes G→ and G5 and the boundaries between the electrodes G5 and G6 are cut (ring cut).

Next, based on the data of the arrow pattern (2) in the ROM (29), for example, the portion (2) of the boundary between the electrode portion H+ and (1) is cut (arrow pattern (2) cutting).

Next, based on the data of the arrow pattern (■) in the ROM (29), the portions (■ and ■') of the boundaries of the electrode portions H+ and (1) are cut (arrow patterns (■ and ■')).
In this case, the data of the arrow pattern ■ can be used as is when cutting the part ■′, but the data classification information of the data,
It includes attached data such as trapezoidal cut information, and if this causes any operational inconvenience, for example, the data of the arrow pattern ■ may be read in reverse (the order of read addresses is read in reverse) and used. This is done to avoid any operational inconvenience.

Next, when the cutting of ■ and ■' is completed with a predetermined number of patterns (5 (16f) in the example shown in the figure), based on the data of the arrow pattern ■ in the ROM (29), Cutting is done (arrow pattern ■cut).

Next, the glass pulp (1) is controlled to rotate by 90° in the radial direction θ.

Next, based on the data of the arrow pattern (2) in the ROM (29), for example, the portion marked (2) at the boundary between the electrode portions V+ and H+ is cut (arrow pattern (2) cut).

Next, based on the data of the arrow pattern (2) in the ROM (29), cutting is performed at the boundaries (2) and (2) between the electrode portions V1 and H1 (arrow pattern (2) and (2) cut). In this case as well, when cutting the portion ``■'', the data of the arrow pattern ``2'' in the ROM<29) is used, for example, by being read backwards.

Next, when the predetermined number of patterns ■ and ■' have been cut, five in the example shown in the figure, based on the data of the arrow pattern ■ in the ROM (29), the electrode section ■ Cutting is done (arrow pattern ■cut).

Next, the glass bulb (1) is controlled to rotate 90° in the radial direction θ.

Next, in the same way as cutting the boundaries of the electrode parts H0 and H1 and the boundaries of the electrode parts H0 and H4+ described above, the electrode part ■(
- and V+ boundaries, and the boundaries of electrode parts V- and H- are cut.

Next, when the cutting of the boundary between the electrode parts ■1+ and V1 is completed, the leads (121+) to (12C) and the contact part CT are cut based on the contactor data in the ROM (29). - cut).

Next, the slit SL is cut based on the slit data in the ROM (29) (slit cut).

Finally, based on the T mark data B of the ROM<29), the part 1]'' of the mark MA is cut (one side T mark cut).

According to this example, the four boundaries of the electrode parts H◆ to V1 are cut alternately in the tube axis direction Z, so unnecessary movement of the glass bulb 11) can be reduced and cutting efficiency can be increased. be able to.

Furthermore, since the mark MA is cut twice at the beginning and end of cutting, it is possible to easily judge whether the cutting is good or bad by checking whether the cutting positions match or do not match. If it is defective, it means that the mechanical precision is poor or the data is defective. - Also, since the common data is used as the cut data for the portions ■ and ■' of the four boundaries of electrode parts H0 to V1,
The amount of data is reduced, and the memory capacity of the ROM (29) is saved. Therefore, for example, according to this example, the amount of data can be reduced by about 500 bytes compared to the conventional one, and it is also possible to use a commercially available ROM of, for example, 2 bytes.

The above-described embodiment is an example that is applicable to a method for manufacturing an S-S type image pickup tube, but it can be similarly applied to a method for manufacturing other cathode ray tubes having similar deflection electrodes.

〔Effect of the invention〕

According to the present invention described above, the first to fourth boundaries that separate the four zigzag patterns constituting the deflection electrode are formed alternately in the - and other directions of the tube axis, so that
This reduces unnecessary movement of the glass bulb and improves cutting efficiency.

In addition, alignment marks are cut twice at the beginning and end of cutting, and it is easy to judge whether the cutting is good or bad based on the coincidence of the cutting positions.

[Brief explanation of drawings]

FIG. 1 is a flowchart for explaining one embodiment of the present invention, FIG. 2 is a diagram for explaining the same, FIG. 3 is a sectional view of an example of an image pickup tube, and FIGS. 4 and 5 are for explaining the same. FIG. 6 is a schematic diagram of the cutting device, and FIGS. 7 and 8 are explanatory diagrams thereof. (11 is the glass bulb, and 63 to G- are the deposited electrodes. Procedural amendment 1. Indication of the case 1985 Patent application No. 132644 3. Relationship with the person making the amendment Patent applicant address Tokyo 6-7-35, Kita-Shinyo, part name (2
18) Norio Ohga, Representative Director of Sony Corporation 4, Agent

Claims (1)

[Claims] In a method for manufacturing a cathode ray tube having four zigzag pattern deflection electrodes patterned by laser cutting and adhered to the inner surface of the bulb, the first and third boundaries separating the four zigzag patterns are aligned in the tube axis direction. At the same time, cut the second and fourth boundaries from one direction to the other in the tube axis direction, and cut the alignment mark twice at the beginning and end of cutting. Characteristic manufacturing method for cathode ray tubes.