DE2146667A1 - Screen unit for an image pickup tube - Google Patents

Description

PATENT LAWYERS ■ 2U6667 Dipi.-chem. Dr. D. Thomsen Dipi.-ing. H. Tsedtke
Dipl.-Chem. G. BÜHHlig Dipl.-Ing. R. Clefts MONKS 15
KAISER-LUDWIQ-PLATZ β
TEL. 0811/53 0211
530212
TELEX: 5/24303 topat Dipi.-ing. W. Weinkauff FRANKFURT (MAIN) 50
FUCHSHOHL 71
TEL. 0811/514 «M

Answer requested to - Please reply to: 8000 Munich 15 * 7 September 1971

Matsushita Electronics Corporation Osaka, Japan

Screen unit for an image pickup tube '

The invention relates to an image pickup tube and in particular to a screen unit of an image pickup tube. The main purpose of the invention is to provide an umbrella unit to create that is robust in structure and without damage to the screen substrate made of a semiconductor material can be produced in a simple manner.

According to the invention there is a screen unit of an image pickup tube with a tubular jacket for the delivery of a vacuum chamber, and is marked through a transparent faceplate, an annular link made of indium that sits between the back of the faceplate and an open end of the tubular jacket

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and is hermetically welded to these two parts, an annular metallic support member that is inserted into the link and the end portion of the tubular jacket is inserted and with its peripheral wall with the inner surface of the Link is welded, wherein the support member in its interior is a screen substrate of the image pickup tube substantially at right angles to the central axis of the mantle, and through an annular signal ring which comprises the end portion of the jacket and the end face in a cap shape and on its inner surface is at least partially in electrical contact with the peripheral wall of the link.

In the following, the invention is illustrated more schematically Drawings explained in more detail.

^ Fig. 1 is a sectional view of a screen unit

according to the invention;

Fig. 2 is a signal ring covering the unit;

Figure 3 is a schematic view of an annular metallic support member, which is in the unit is located;

Fig. 1 is a sectional view of one embodiment of the annular metallic support member;

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Pig. Fig. 5 is a partial sectional view of another embodiment an annular metallic support member.

1 shows an umbrella unit Io according to the invention which has a transparent faceplate 12. The face plate 12 is at one open end of a tubular jacket 14 hermetically attached to an image pickup tube, namely by pressure welding or pressure welding with an annular connecting member 16 made of indium and inserted therebetween is. The tubular jacket Io is at its other end (not shown) hermetically sealed to provide a chamber for the free passage of an electron beam can be evacuated. An annular metallic support member 18 is partially coaxial in the end section of the jacket 14 used, which supports a screen substrate inside which is e.g. monocrystalline silicon; the support member 18 is attached to the shell by means of the pressure-welded link 16. The support member 18 can advantageously the rear surface of the end plate 12 can be attached to achieve mechanical robustness.

The screen substrate 2o is preferably arranged substantially at right angles to the central axis of the cladding I ¹ I, one surface of which is exposed to the optical image which penetrates through the face plate 12. The opposite surface of the panel substrate 2o is the use of an electron

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scanned electron beam emitted from an electron gun (not shown), producing an image signal is generated, which is collected by a suitable external device via the link 16. The perimeter wall of the support member 18 can be made of a suitable soft metal such as indium, tin or an alloy thereof in order to obtain a robust welded connection between the peripheral wall and the connecting member 16.

The shield unit 2o also preferably has a signal ring 22 according to Pig. I ^ of the face plate 12 and the jacket 14 in the manner shown in FIG Includes cap-shaped, so that a robust structure and pleasing shape of the umbrella unit Io is achieved. The signal ring 22 can be pressure welded to the jacket 14 with the aid of Indiums or attached with the help of an adhesive, simultaneously with the completion of the Screen unit for pressure welding; the attachment can also take place after the support member 18 is attached to the end portion of the jacket 14 is attached. The signal ring 22 advantageously has a mask portion 22 which is attached to the edge portion of the .. face plate 12 is attached; the signal ring can also simply be cylindrical. The signal ring 22 consists made of an electrically conductive substance and is with its inner surface with the outer surface of the link in contact so that it can be used as an output terminal for the electrical

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Can serve image signal generated in the screen substrate 2o.

According to Fig. 3, the support member 18 is preferably designed so that it has a reduced portion 26 with a has smaller diameter than the remaining portion 28, so that in the inner wall an offset portion between the reduced section 26 and the remaining section 28 is obtained.

As can be seen from Fig. 4, the screen substrate is seated 2o on the offset portion of the support member 18 and is on this with the help of an adhesive or with the help of a Solder material with a low melting temperature, e.g. indium or Pewter attached.

According to FIG. 5, the screen substrate 2o is located on the offset portion as before, but in this case is secured by means of a ^{washer 12 which is pressed by an inwardly bent end portion 3 2} J of the support member 18. The washer 32 is suitably undulating so that it provides a spring effect.

From the results described above, ₃ that can be first connected in the fabrication of the support member 18 with the tubular shell I ¹ I and the end plate 12 by Druckversehweißen and then the screen substrate in the 2o

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Support member 18 is used so that the screen substrate is not subjected to any mechanical force or heat as they are used in the manufacture of the screen unit.

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Claims (1)

2H666.7 Claims Πι) Screen unit for an image pickup tube with a tubular jacket for supplying a vacuum chamber, characterized by a transparent face plate (12), an annular connector made of indium, which is inserted between the back of the face plate and the open Ehde of the tubular jacket and with both Sharing is hermetically connected by pressure welding, by an annular metallic support member (18) inserted into the end portion of the tubular jacket and connector and welded with its peripheral wall to the inner surface of the connector, the support member internally supporting a screen substrate of the image pickup tube that is substantially perpendicular to the central axis of the jacket, and is through an annular signal ring (22) which comprises the end portion of the jacket and the end plate cap-shaped and at least partially on its inner surface% with the peripheral wall of the link in electrical contact. 2. Umbrella unit according to claim 1, characterized in that the metallic support member (18) has a reduced portion (26) with a smaller diameter than the remaining portion (28) of the jacket, the screen substrate (2o) on this offset section in the inner wall between the reduced section and the remaining section is attached by means of an adhesive. 209813/1 173 3 · screen unit according to claim 2, wherein the end portion of the remaining portion of the metallic
Support member (18) has an inwardly bent portion
and that the screen substrate is held between the offset portion and the inwardly bent portion by means of a washer. ¹ year umbrella unit according to claim 1 or 2, characterized in that the metallic support member is clad with indium on its outer surface. 5. umbrella unit according to claim 1, characterized in that the metallic support member on its outer surface with Tin is plated. 6. umbrella unit according to claim 1, characterized in that das.metallische support member on its outer surface is plated with an alloy of indium and tin. 20981 3/1173