DE6916575U - TWO- OR MULTI-CIRCULAR INTERMEDIATE FREQUENCY FILTER, IN PARTICULAR FOR TELEVISION RECEIVERS - Google Patents

Description

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QRAETZ
Limited partnership
Altena / Westf. . ■ ■

Graet.zstrasse 50

R. Schimmeyer 9. . ■ r

Q. Bless 2. .

Dual or multi-circuit intermediate frequency filter, especially for television receivers

The innovation concerns two or more circuit intermediate frequency filters with unchangeable capacitors and inductances and a given shape of the transmission curve, especially for television receivers.

• 5 such filters are used individually or in combination with others

used, for example im'Bild intermediate frequency amplifier from TV receivers for standard-compliant amplification of an amplitude-modulated carrier with partially suppressed sideband and frequency-modulated accompanying sound carrier. This requires compliance with certain criteria, such as bandwidth, edge steepness, Attenuation measures and zeros at a specified distance from the carrier frequency. Similar requirements exist in the audio intermediate frequency part of radio and television receivers, which generally have a passband that is symmetrical to the carrier frequency with a given bandwidth and selection is sought.

These filters usually contain reactances in the form of coils and capacitors, the dimensioning of which is the transmission characteristic essentially determined. '.' In known arrangements, usually Some of the components are designed to be variable, for example in the form of trimmer capacitors or coils with adjustable cores. Scatters in the electrical values of the components are compensated for after they have been manufactured or after the filter has been installed or compensated by a suitable setting. There is the possibility of misalignment and as a result of the variability of the components also the risk of misalignment due to aging effects and mechanical impact.

April 18, 1969 \ .... '

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691

E no. 8522

Reg. No.

Case: R. Schinmeyey 9-2

Title:

Two-circuit or multi-circuit intermediate frequency filter, in particular

for television receivers

List of terms used

pull-out Original language D / E sign j. Hard paper board 2 Flat coils 3 Le it he trains H Ceramic disc 5 Capacitor pads 6th edge 7th soldering 8th plate

Ratio E / D

ft. Sehiffim§yer 9. · ' ^: ·' ^{:: <} : · ■ '■ ":'

Q. Piping 2 "". "."'- 2 ¹¹ -

Another known possibility is to make components more sufficient Accuracy to use, for example in the form of flat coils, which are applied in etching or plating technology as a film Insulating material plates can be manufactured very precisely and ceramic capacitors, which are made by grinding or sorting on the desired value can be maintained. However, this is associated with relatively high costs.

The present innovation aims to address the disadvantages mentioned avoid and reduce manufacturing costs.

According to the invention, this is achieved in that all or more inductances are made as flat coils using etching or plating technology executed and together on an insulating plate, preferably made of hard paper, are arranged so that all or more capacities continue to be designed as ceramic disc capacitors and are arranged on a common substrate with a subdivided covering, the covering parts with at the edge of the disc adjacent contact surfaces are connected, and that both plates with each other or with a third, further. Circuit parts bearing and provided with conductor tracks plate mechanically and electrically connected and the capacitors carrying plate and possibly also the plate carrying the coils at right angles into a slot in the receiving plate are used in such a way that. the contact surfaces protrude through the slot and are connected to the corresponding conductor tracks of the receiving plate, are preferably soldered by dip soldering.

To operate such a filter even at higher frequencies, at which concentrated inductances are difficult to represent to be able to, according to a further development of the innovation, the inductances are wholly or partly by Le ehe rsy stars replaced. '

R. SchimmeyerV:.:. . : ::,: ..: ·. ·. ^: ..i ^u

Another embodiment can be done in the Porn that the Similar components supporting plates of two or more filters that are used in the same apparatus, each by dividing them a larger plate can be obtained after its completion. - ■

An exemplary embodiment is shown in the drawing and is described in more detail below. It shows the figure la, Ib and Ic in plan view, front and side view a new, simple 2-circuit filter,

Figure 2 for a better understanding of the mode of operation,

comparatively the electrical configuration

Figure 3 shows a further, innovation according to the embodiment

/ ■

example.

A hard paper plate 1 carries flat coils 2 in a spiral shape uVid Conductor lines 3 »which are connected to each other accordingly (e.g. according to the circuit diagram). In a slot of this plate is a ceramic disk 4 is used, which is covered with capacitor plates 5 is provided. These end in contact surfaces arranged on the edge 6, which corresponding parts of the conductor tracks 2 on the plate 1 face. The mechanical and at the same time electrical The connection is made by means of the soldering 7, preferably using the dip soldering process. - · ■■■

Figure 3 shows a further embodiment of the innovation. It is similar to the arrangement described above, but is here the plate 1 carrying the coil in the same way as the plate 4 carrying the capacitors into a third, further conductor line and plate 8 carrying circuit parts is inserted and connected to it by means of soldering 7.

R. Schimmeyer 9
G. Bless 2

For the electrical puncture, use is made of the fact that that with multiple components that are on a common Substrate can be manufactured in the same operation, all deviations caused by material properties and processing method proceed in the same way from the setpoint. The relative scatter

the individual elements are therefore very much smaller than one another. This effect is used by the invention. the changes caused by scattering of the components in the same direction • The resonance frequency of the filter circuits also changes

in the same direction, while the essential filter properties, such as transmission loss / bandwidth and selection, are largely retained. Only the center frequency experiences a significant change. For this purpose, however, certain deviations from the Sollert are permissible in many cases, since in general the passage width of the functional groups of the receiver arranged in front of the intermediate frequency part is substantially greater than the bandwidth of the intermediate frequency part. For example, a 5% deviation of all frequency-determining capacitors in the same direction causes a shift in the pass band of around 2.5%. This value '20, given the relative bandwidth of a television intermediate frequency Ver strength rs (ca '. -12%) may be considered small, since the bandwidth of the upstream RF part about 1 1/2 to 2 times greater ■ and such shift safely covered. The change that also occurs in the bandwidth of the dual frequency filter of approximately 2.5 % is almost insignificant.

Be be several such filters are used in the same apparatus, ensures the effect .that of variations in all of the filters is equal to. "This is approximately also achieved that all the similar components bearing panels obtained from a RESIZE ßeren plate according Deten completed production by dicing are, ' ' because then all sub-panels are subject to the same material and manufacturing influences.

R. Schimine yer 9

Q. Bless 2 - 5 -

The advantages achieved with the innovation are special in that by dispensing with scatter compensation and tight manufacturing tolerances, the filter components in simple and processes suitable for efficient mass production can be produced and assembled. At the same time, be with it high operational reliability and aging resistance achieved.

3 claims for protection

1 sheet of drawings (3 fig.)

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Claims (1)

R. 3chimmeyer 9 ': ·· ■■ G. Bless 2 - β - 1. Two or more circuit intermediate frequency filter with no changeable inductances and capacitances and the given shape of the transmission curve, especially for television receivers, characterized in that all or several inductors as flat coils in etching or plating technology executed and together on an insulating plate, , preferably made of hard paper, are arranged that all or more capacities are further designed as ceramic disc capacitors and are arranged on a common substrate with a subdivided covering, the covering parts being connected to contact surfaces located next to one another on the edge of the disc and that both plates or mechanically and electrically connected to a third plate carrying further circuit parts and provided with conductor tracks and the plate carrying the capacitors and possibly also the plate carrying the coils are inserted at right angles into a slot of the receiving plate in such a way that the contact surfaces protrude through the slot and with corresponding Conductor lines of the receiving plate, preferably soldered by dip soldering. _/ 2. intermediate frequency filter according to claim Ii characterized that the inductances consist entirely or partially of empty systems / 3. intermediate frequency filter according to claim 1 and 2, characterized characterized in that the similar components supporting plates of two or more filters that are in the same Apparatus used to consist of such plates, each by dividing a larger plate after its completed Manufacturing are won. / April 18, 1969
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