FI62923B - COIL SPY - Google Patents

Description

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Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2520931 + .1-33 (71) Blaupunkt-Werke Gmbh, Robert-Bosch-Str. 200, 32 Hildesheim,

Federal Republic of Germany-Förbundsrepubliken lyskland (DE) (72) Dieter Haas, Hildesheim, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (7I +) Oy Kolster Ab (5I +) Printed reel - Tryckt Spole

The invention relates to a coil printed on an insulating plate with a helically running multi-threaded strip having a non-uniform strip width.

According to the current state of the art, it is known that it is not possible to manufacture coils in microcircuit technology. However, in order to be able to produce inductances in a small space with low manufacturing tolerances, coils have been manufactured for some time using the technique of printed conductor strips. Spiral threads, such as conductor strips, are pressed onto the insulation board. The coil can then be formed unilaterally or bilaterally with threads printed on the insulation board.

The electrical values of these coils, such as the inductance or the goodness of the coil, depend crucially on the length of the threads, the width of the tapes, the distance between the threads and the average diameter of the threads. In known coils, these parameters are chosen to be fixed, so that a certain state is required to achieve a certain inductance. This space may be limited by the size of the instrument and the consequent space available for the circuit board. In addition, in the case of unilaterally printed coils, there is a problem that one connection point of the coil is inside the coil and the other connection point 62923 is outside. It is often advantageous to connect these connection points immediately to a structural element, e.g. a capacitor, which forms an oscillation circuit with the coil. This advantage often cannot be exploited because the required inductance and coil goodness require a strip width and a number of turns that provide such a minimum distance between the connection points that the frame size of the other components for printed circuits is exceeded.

Thus, for a given existing state, in the prior art, it has been possible to produce coils of a certain goodness only at a maximum inductance value which could not be exceeded. In other words, in a given state, the goodness of the coil could be increased only at the expense of inductance.

The object of the invention is to develop a printed coil with which these limits of known printed coils can be exceeded.

According to the invention, this object is solved by a printed coil according to the characterizing part of claim 1.

The advantages thus obtained are apparent from the above and are characterized in particular by the saving of space and the usability of other structural elements in connection with the printed coil.

According to the invention, there is provided a coil with which the goodness of the coil can be considerably increased in a certain state compared to conventional coils without a significant decrease in inductance.

An embodiment of the invention is shown in the accompanying drawing and will be explained in more detail below.

Figure 1 shows a printed spool in which the strip width of the threads decreases from the outside inwards.

The coil 1 shown in Fig. 1 has an inner connection point 2 from which the threads protrude helically. The outer connection point of the coil 1 is not shown in more detail in Figure 1. The coil 1 is entirely oval. However, this shape is given by way of example only and may be replaced by any other possible coil shape in order to carry out the invention. The coil 1 is printed on an insulating material plate 3 with a hole U inside the coil, which receives the coil core. In the example shown in the inner connection point 2, the insulating material plate is drilled through two points, so that the contact can be made in the normal way.

In the implementation of the invention, the threads of the coil 1 have a strip width which increases from the inside to the outside. The distance between the individual threads has been kept constant. When the space is very small, the thread spacing can be selected as small as it is possible to manufacture in printing technology.

Compared to a conventional printed spool with a strip of all threads