DE1935127A1 - Electron gun for cathode ray tubes - Google Patents

Description

PATENT LAWYERS Dr. D. Thomsen, H. Täedtke, Q. Bühiing

Djpl.-Ohem. Dipl-Ing. Dipl.-Chem.

8000 MUNICH 2 VALLEY 33. ■ TELEPHONE 08 11/226894

TELEGRAM ADDRESS: THOPÄTENT

MONKS lo. July 1969

case PG25-691O - T 3192

Matsushita Electric Industrial Company, Limited

Osaka (Japan)

Electron gun for cathode ray tubes

The present invention relates to an electron gun for a cathode ray tube and, more particularly, to improvements on electron guns that have a detachable cathode grid assembly and such as those for cathode ray tubes and other electronic devices.

Most of the conventional electronic devices, such as a tube for recording high frequency waves or a tube for storing images, for example, have delicate, complicated and expensive parts or components in addition to the electron gun. If such an electronic device shows damage to a cathode of the electron gun after it has been sealed under vacuum, the entire device is worthless and must be discarded as _{scrap s} v / a: .i is extremely expensive. Self

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when replacing the electron gun of the electronic device, it is almost impossible because the conventional electron gun has many parts or accessories, attached to the electrodes.

With the conventional electron gun as shown in The cathode ray tube is used, are the electrodes with the outside over passed through the base of the tube Leads connected to carry the voltages to the electrodes To be able to apply, .so that it is difficult to remove the cathode grid arrangement from the entire arrangement in order to replace this by cutting the glass jacket.

In accordance with the invention, these and other disadvantages are eliminated of conventional electronic devices with an electron gun and the present invention seeks an electron gun assembly for a cathode ray tube showing a removable cathode grid assembly having.

An advantage of the present invention is that the electron gun assembly has a detachable cathode grid assembly which has a plurality of leads at the base of the tube which are connected to the respective electrodes and which lead out at the base of the tube, the cathode grid assembly being one Has screw connection, so that it can be easily removed and attached "3098 ^v

bar, the cathode grid assembly being supported by multiple glass rods is held.

Another advantage of the present invention is in that the electron gun-an anode and a Having focusing electrode assembly, the multiple fused Has side feeds, which ^ with the corresponding corresponding electrodes are connected and from the side of the Lead tubes radially to their outside and which are arranged from the foot of the tubes 2o to 3o mm against the screen of the cathode ray tube, the focusing electrode arrangement is held by multiple holding glass rods. Thus, if the cathode electrode is damaged or burned out and if it is to be replaced, then so the cathode grid assembly can be replaced after the The assembly is cut out of the tube, and the tube can then easily be repaired, evacuated and sealed will.

In the following, the invention will be described in more detail with reference to in Preferred execution games shown in the drawing explained. In the drawing shows:

Figure 1 is a sectional side view of an embodiment a cathode ray tube that has an electron gun with a detachable cathode has the grid arrangement, which according to the

S09883 / 1390

ORIGINAL

present invention is formed;

Figure 2 is a side view of the main part of a

/ - ■ - ■

... electron gun that has a detachable

■ has cathode grid arrangement that

is not removed; and

FIG. 3 shows a side view similar to that in FIG. 2 _f , but in which the electron gun is shown from which the removable cathode grid arrangement has been separated '""■■■' ■ "■ '■"

In Figures 1 to 3, one embodiment is one An electron gun for a cathode ray tube is shown incorporating a removable cathode grid assembly in accordance with the present invention having. The cathode ray tube Io

has a glass jacket 11 and an electron gun 12, wherein the electron gun 12 has a removable cathode grid assembly 13, the multiple Mehrfaehhalter.glasstaben 14, a cathode 15, a grid electrode 16 through the Multiple holding glass rods 14, another grid electrode. ' 17 held by the multiple holding glass rods 14 is held and is provided at one end with a thread 18, and has a plurality of socket leads 19, the with the cathode 15 and the corresponding electrodes 16 and 17 are connected and led out to the outside at the base 2o and facing the cathode ray tube

.9098837139a

Ö ORIGINAL

furthermore an anode and a focusing electrode arrangement 21, which holds several multiple holding glasses 22, one Electrode 23 held by multiple holding glass rods 22 - and provided at one end with threads 24 for engagement with threads 18, anode 25, held by the multiple holding glass rods 22, a focus electrode 26 held by the multiple holding glass rods 22 and a plurality of leads 27 on,

i. which are connected to the respective electrodes 23, 25 and 26, sealed or melted down and radially out of the side of the jacket 11 are led out to the outside.

To remove the cathode grid assembly 13 from the electron gun 12 of the cathode ray tube Io, the Base part of the cathode ray tube Io cut open and the cathode grid assembly 13 can be from the electron gun

12 can be removed / that the cathode grid arrangement 13 associated with the anode and focusing electrode assembly at the engagement zv / isehen the thread 18 of the grid 17 and the thread 24 of the electrode 23 is screwed, unscrewed will. After then the cathode grid arrangement

13 has been replaced by a new arrangement with the anode and focusing electrode arrangement 2.1 on the * v / inde 24 of the electrode 23 has been screwed, the cathode ray tube Io can be restored, evacuated and sealed.

909883/13913

Claims (1)

Claim I)) Electron gun for a cathode ray tube with a glass jacket, characterized by a removable Cathode grid assembly (13) comprising a plurality of first "glass-holding glass rods (14), a cathode (15), a grid (16), held by the first multiple holding glass rods (14) an electrode (17) penetrated by the first multiple holding glass rods (14) is held and at a Lr.de with a thread (18) is equipped, and several JockelzufÜhrungen (19), which are connected to the cathode (15) and the respective electrodes (16, 17) and to the outside the pipes are led out at the foot, and through an anode and focusing electrode assembly (21), "the plurality of second multiple glass holding rods (22), one electrode (23) through the second multiple holding glass rods (22) is held and at one end with a thread (233 for Engages the threads (18) of the removable kitchen grid assembly is provided, an anode (25) held by the second multiple holding glass rods, a focusing electrode (2 © / which is held by the second multiple holding glass rods (22) and has several lines (27), which are connected to the respective electrodes, sealed and " on the side of the glass jacket (11) radially to the outer side Tube are led out. 909883/1390 ; ORIGINAL