DE1271851B - Delay conductor arrangement - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

H03h

German KL: 21g-34

Number: 1271851

File number: P 12 71 851.3-35 (N 24133)

Filing date: December 10, 1963

Open date: 4th July 1968

The invention relates to a delay line arrangement for delaying through an oscilloscope Earth-symmetrical stresses to be represented, consisting of two concentrically and one above the other, Helical conductors wound with a constant pitch, which are embedded in an insulating compound are.

In the case of electron beam oscilloscopes for high frequencies, at which the time base depends on the Appearance is triggered, the difficulty arises that the triggering always occurs with a There is a certain delay, which means that the appearance is not fully reproduced on the screen will. It is known to counter this disadvantage in that from the to be reproduced Appearance derived voltages are conducted through a delay cable before being sent to the deflector plates reach. Since the deflection voltages are generally amplified in push-pull and the perpendicular Deflectors are fed, it is necessary that the two wires of the cable in electrical Are as symmetrical as possible. In particular, the propagation speeds in be the same for both cores.

It is known from Swiss patent specification 233 050 to use two separate cables, one in each push-pull half of the amplifier. This has the disadvantage that the cables take up a lot of space and unequal delays in the two cables can occur, e.g. B. at the Reproduction of square-wave voltages occurs.

It is also known that the turns of the wires in delay cables for oscilloscopes are the same Winding incline side by side on an insulating core. With the same diameter of the turns of the two coils are then the dimensions of the necessary for a certain time delay Cable piece also larger than is desired in view of the limited space. Even the manufacture of such cables is relatively complex.

Delay lines with two concentrically arranged, helically wound conductors are also already known, so z. B. from German Patent 814 490 and 959 747 and from the U.S. Patent 2,820,172.

It is also known to give these windings different winding diameters, e.g. B. off U.S. Patents 2452572 and 2454,865.

Finally, it is also known that the transit time of a delay line depends on the slope of the Delay conductor arrangement

Applicant:

N. V. Philips' Gloeilampenfabrieken,

Eindhoven (Netherlands)

Representative:

Dr. H. Scholz, patent attorney,

2000 Hamburg, Mönckebergstr. 7th

Named as inventor:

Jacobus Rijk, Eindhoven (Netherlands)

Claimed priority:

Netherlands of December 14, 1962 (286 786)

Winding is dependent, z. From U.S. Patent 2522731.

Proceeding from this prior art, the invention is based on the object of a delay conductor arrangement to create that is electrically symmetrical and has equal propagation speeds in both conductors.

The invention consists in that the outer conductor winding with so much greater pitch than the inner conductor winding wound is that the speeds of propagation of electrical vibrations are equal to each other across the two conductors.

In addition to the desired electrical properties, this arrangement also has the advantage of to be easy to manufacture and to take up little space.

The invention is based on an embodiment of a cable shown in the drawing explained in more detail according to the invention. The delay cable is located between the output of a preamplifier 1 and the input of an output amplifier 2. With the output of the latter the vertical deflection plates 3, 4 of the picture tube are connected. The cable has two conductors 5 and 6, whose first conductor 5 has a larger winding diameter and a greater pitch than the second. The turns are fixed by insulating material (not shown).

809 568/441

Claims (1)

3 _ 4 ' The coils are coupled to one another, and so are suitable values for a cable for 30 MHz probably the winding sense as well as the current direction e.g .: * the outer and inner coils are opposite to each other. the outer conductor diameter generated by the two coils is 2.3 mm Magnetic fields rectified so that the two In- 5 "diameter inner conductors Ij9 mm ductivities L around the mutual inductance M er turns per centimeter must be increased in order to achieve the effective inductance of the outer conductor 28 obtain. The mutual inductance is the number of turns per centimeter ratio between the diameters of the inner cable of the inner conductor 55 and the outer cable proportionally, so that the effec- io tive inductance is: The production is particularly easy. The inner conductor is placed on a core made of flexible insulating __ /!>! \ material wrapped, with a layer of insulating material LeK = L + M = 11 + ~ ß ~) of a suitable thickness and then the ^ ² '15 second coil wound. If necessary, you can then a second layer of insulating material can be applied. The same transit times require that the inductive _, the inner and outer coils would make equal claims to one another: must be. 'Delay line arrangement for delaying The inductance and the capacitance of the conductors of the ao of the earth- Cable can be made up of the diameter, length, symmetrical tension, consisting of two the number of turns per unit of length and the dielectric - concentrically and one above the other, Calculate the tricity constants of the material. The spiral, with a constant pitch, characteristic impedance and the delay time those conductors embedded in an insulating compound can be derived from the inductance and the capacitance 25, characterized in that the to calculate. Outer conductor winding (5) with that much larger pitch At high frequencies the cable used is wound as the inner conductor winding (6), piece, the length of which is e.g. Im, be long so that the propagation speeds of the elec- versus the wavelength along the cable. Trial Irish vibrations across the two conductors Accordingly, it was found that the ratio of these 30 (5, 6) are equal to each other. Wavelength to the diameter of the outer conductor must preferably be greater than 20. Given the relevant publications: pedanz, given desired characteristic German patents No. 814 490, 959 747; Impedance and given delay can be found in U.S. Patents No. 2,820,172, 2,452,572, then the various data for the cable, e.g. 35 2454 865.2522731; with a cable length of 1 m. Swiss Patent No. 233 050. 1 sheet of drawings 809 568/441 6.68 © Bundesdruckerei Berlin