DE1564634A1 - Cathode ray tube - Google Patents

Description

Dr.Ing.A.vand “Werft München, June 20, 1966

Dr. Η? *! «: U * ier # r

PATENT LAWYERS

SPECTO AVIONICS LIMITED

Cricklewood Works, London N, W, 2 / England

"Cathode ray tube"

The invention relates to a cathode ray tube apparatus of the kind in which a tube with a high-intensity beam track and with a small screen may under certain circumstances should be used among which it is desirable that the tube for maintenance or repair is pulled forward out of the device. As an example of a device of this type, navigation devices, which see, suitable for use in airplanes ^ a tube with track beam high intensity and small screen,

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projecting the image on the screen into the line of sight of the pilot or navigational officer of the plug tool will. The image on the stirrer screen is a representation of navigational or circumstance data from the Aircraft or its surroundings.

In an apparatus of this type, it is very desirable that it should be possible to use the cathode ray tube with its front surface first out of its holder for maintenance or repair, since the The neck end of the tube can be difficult to access. At the same time are the anode voltages with which tubes these Kind of normally operated very high and so the device has to go through the door on this', / iron out can also allow a safe and proper connection to the end anode of the cathode ray tube to manufacture.

A general object of the invention is to provide an arrangement which enables convenient and safe assembly a cathode ray tube can be achieved for this type of equipment, and the invention provides an assembly which consists of a cathode ray tube and a holder for the cathode ray tube, wherein the Wrapping the cathode ray tube an elongated one Neck and an enlarged head that supports the

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Front surface of the cathode ray tube comprises and wherein .The cathode ray tube has a high-voltage end terminal contact that extends over a short distance from the Side of the head protrudes and wherein the bracket forms an open-ended cut in which the Cathode ray tube is added with its front surface exposed at the open end of the cutout and from which the cathode ray tube can be pulled out with its front face first and a holding device which releasably holds the cathode ray tube in the incision and an elastic high-voltage contact device, which is formed next to the incision and on the aforesaid. End contact attacks, and in what an insulating wall part of the bracket closely with at least part of the casing of the cathode ray tube cooperates, to limit a leakage path from the high voltage contacts to a metal part that is in service is at or near earth voltage.

The invention also provides a holder for a cathode ray tube, the envelope of which is substantially symmetrical about an axis and has a front surface, a conical portion and an elongated cylindrical neck, the cathode ray tube having a high voltage end. clamping contact comprises of a short, S treks to or from a point near the tapered ■ Teiles-.

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protrudes from the side of the cathode ray tube, wherein said holder comprises a receptacle which has a Open ended cutout depicting the cathode ray tube with its front face at the open end of the Cutout exposed while its axis extends along the incision and with a High voltage contact device next to the cutout with a contact part that is elastic for displacement is mounted in a direction substantially parallel to the axis of the cathode ray tube to attack the end terminal contact 11, an insulation wall part for the said container with a cylindrical and a conical part for close cooperation with at least a portion of said neck and conical portion of the cathode ray tube, around a To restrict creepage from the high voltage contacts.

Further features and advantages of the invention result from the following description of an embodiment shown in the accompanying schematic drawings.

Fig. 1 is a schematic sectional view, with individual parts omitted, showing the high voltage connection shown in a cathode ray tube holder and showing the cathode ray tube

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Fig. 2 is a front view of a particular cathode ray tube holder; and

Fig. 3 is a sectional view taken along the line III-III in Fig. 2.

In Fig. 1, a cathode ray tube 1 is shown with a straight cylindrical neck portion 2, which is at the front end of the Tube is connected to a really conical section 5, which in turn is connected to a cylindrical section 4 and ends in the front face 5 of the tube. not Contact pins shown are provided at the end of the neck to suit other voltages around the terminal anode voltages of the tube or any post-rejection accelerating voltage to the tube.

A container is provided for the front end of the tube and this consists of an insulating housing 6 with a cylindrical part 7 that fits on the neck 2 of the tube and of a conical part 8 that joins the conical part 3 fits the tube. The housing is closed at its front open end with the aid of a cap 9 which is attached to the Housing is screwed on. The cap 9 has a central viewing opening 10.

The connecting terminal for particularly high voltage of the cathode ray tube is as a small outstanding con

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clock button 11 is formed, which is inside the stirrer with the end anode is connected. The contact 11 is best at the junction of the sections 3 and 4 of the tube, but can be arranged somewhat differently, provided that it is not particularly extends beyond the maximum diameter of the tube, as represented by the cylindrical part 4. The case 6 has a mating contact 23 for engaging the contact 11, which is in a cylindrical cutout; 13 in the Housing is and is pushed forward with the help of a helical compression spring. The axis of the carrion section 13 lies parallel to the axis of the housing, so that a good engagement between the contacts 11 and 12 is ensured is and the cutout is arranged so that insulating material the current-carrying metal parts of the connection surrounds tightly and forms a seat for the insulation of the line 15. A flexible high voltage conductor 15 provides the electrical connection to the contact 12 and thus to the contact 11 on the tube. Since the tube is approximately is circularly symmetrical, an angular position is provided, whereby the contacts 11 and 12 with each other match when the tube is fully inserted. For example, a guide pin 16 on the neck of the Tube attached to cooperate with a guide slot 17, which is formed in part 6 of the housing, as shown in FIG.

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Flg. 2 and j? illustrate an embodiment of the invention, as they are currently is preferred. The front housing end of this bracket deviates somewhat from that in Figo 1 described bracket, which is described below. Fig. 5 shows further details of the holder including of the deflection coils 18 for the cathode ray tube, which are adjacent to the cylindrical part 7 of the housing 6 are arranged, a bundling magnet 20 and a small end sleeve 21 of the usual type for contact pins at the end of the neck of the cathode ray tube, in order to lead the tube low voltage i; u2; ufführung, with the grommet 21 on a lower Spring tension standing frame 22 is mounted. A cylindrical flux iron shield 23 is around the outside attached around the housing.

In Fig. 2 it is shown that the housing, in addition to the high-voltage contact 12, are two under spring pressure Having plungers 24 and 25 which are arranged so that they form an elastic three-point mounting for the tube with the contact 12. Plungers 24 and 25 attack the cladding of the cathode ray tube and keep the tube straight from the solid parts of the Housing 6 from when the end cap 9, not shown, is screwed tightly to the tube in its position hold while shallow cuts 26, 27 and 28 are cut into the conical surface 8 of the housing, to reduce the weight of the device.

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In the preferred embodiment, the contact slides 12 in an insulating sleeve 29, which prevents the B'eder 14 expands excessively when the cathode ray tube is pulled out. The tube can be held in the housing against angular rotation by the spout 21, which engages the contact pins at the neck end of the tube.

With the brackets described it is shown that a reliable contact is made with the contact 11 of the tube and at the same time adequate insulation is maintained between the contact 11 and any surrounding parts of the device at low or earth voltage. The creepage distance from the extra high voltage connection is of a sufficiently high value, even if voltages of up to J> 0 kilovolts act on the end terminal. In particular, it should be pointed out that the creepage path from the contacts 11 and 12 to the Ablerikungsspulen is determined by the close interaction of the insulating cover of parts J> and 4 of the cathode ray tube with parts 7 and 8 of the housing, which ensures that this path is sufficiently long and is narrow. In addition, the creepage paths from parts of the extra-high voltage connection to externally grounded metal objects are very limited.

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Claims (6)

Patent claims: . 1.) An assembly consisting of a cathode ray tube and its holder, wherein the cathode ray tube has an elongated neck portion and an enlarged head, which includes the cathode ray tube face and a high voltage end clamp and in which the bracket has an open-ended cutout in which the cathode ray tube is received and a high voltage connector for said end clamp, thereby marked i c hne t that said end clamp (11) just a short distance from the side of the head (3 and 4) the cathode ray tube protrudes, with the connector (12, Ij5 and 14) arranged next to the mentioned section is, wherein an insulating wall (7, 8) of the cutout closely surrounds part of the envelope of the cathode ray tube, to reduce the leakage path from the terminal (12) and the end clamp (11) and wherein the cutout is so formed is that the cathode ray tube is pulled out of the cutout with its front surface first can. 2. Assembly according to claim 1, characterized in that that the connection in the holder has a contact part (12) which is resilient in an insulated cutout is mounted for displacement in a direction parallel to the length of the cathode ray tube neck (2), wherein 909 tSO / 05 713 the Kentaktteil (12) on the said end clamp (11) the cathode ray tube and with a high voltage kubel (15) is connected. 5. Assembly according to claims 1 or 2, characterized marked that the bracket has two plungers (24 and 25) has, which are also mounted next to the cutout and attack the cathode ray tube head, the mifc an essentially symmetrical, elastic three-point suspension for the high-voltage connection (12) Form the head of the cathode ray tube. 4. Assembly according to any one of the preceding claims, characterized in that the holder Deflection coils (13) (known per se) mounted next to the neck (2) of the cathode ray tube, where the mentioned // application (7 and 3) of the section at least partially between the deflection coils (18) and the neck (2) of the cathode ray tube is turned on to restrict the leakage path to the deflection coils. 5. An assembly according to any one of the preceding claims, characterized in that the head of the cathode ray tube has a conical Te ⁵ I (3) and the neck (2) of the cathode ray tube is substantially BATH - OK - 009850/0 570 it is, unc that the mentioned wall of the cutout conical (3) and cylindrical (7) sections on vie is sun interacting with parts of the said conical part (3) and the neck (2) of the cathode ray tube. 6. Assembly according to any of the preceding Claims, characterized in that the cathode ray tube is held in the cutout by an apertured cap (.9) that fits snugly over the head of the Cathode ray tube fits to the creepage distance from the connector (Ε) and contact (11) to the outside. Assembly according to any one of the preceding -insprehe, characterized in that the angular position "he cathode ray tube in the cutout by a Fuehrigs pen and protective device is created, such as an EndJilem-ienstift and a grommet (21) for lower ones 3 voltage at the end of the cathode ray tube neck or a guide pin (16) next to the cathode ray tube neck -.-. Pf, which engages in a guide slot (I7) in the said '..' and (7) -! es section. · 9O98.fO/O.57Ö _ 11 _ bad OBtätNAW