DE737870C - High-frequency receivers with shields, in particular motor vehicle receivers - Google Patents

High-frequency receivers with shields, in particular motor vehicle receivers

Info

Publication number
DE737870C
DE737870C DET46254D DET0046254D DE737870C DE 737870 C DE737870 C DE 737870C DE T46254 D DET46254 D DE T46254D DE T0046254 D DET0046254 D DE T0046254D DE 737870 C DE737870 C DE 737870C
Authority
DE
Germany
Prior art keywords
receivers
shields
receiver
motor vehicle
particular motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DET46254D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefunken AG
Original Assignee
Telefunken AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
Priority to DET46254D priority Critical patent/DE737870C/en
Application granted granted Critical
Publication of DE737870C publication Critical patent/DE737870C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/006—Casings specially adapted for signal processing applications, e.g. CATV, tuner, antennas amplifier

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Description

Hochfrequenzempfänger mit Abschirmungen; insbesondere Kraftwagenempfänger Bei Kraftwagenempfängern hat sich gez,eigt, daß trotz Abschirmung des Empfängers und Verdrosselung der Stromzuführungsleitungen noch Störungen auftreten, die nicht über die Antenne, sondern auf andere Weise in den Empfänger gelangen. Diese Störungen lassen sich vermeiden, indem man, wie bei Meßkäfigen und --#leßsendern bekannt, den abgeschirmten Empfänger oder einen 'teil des Emfängers in einer zweitem Abschirmung anordnet, welche mit der ersten Abschirmung nur an einer oder an dicht beieinanderliegenden Stellen leitend verbunden und im übrigen isoliert ist.High frequency receivers with shields; in particular car recipients In the case of vehicle receivers it has shown that despite the receiver being shielded and throttling of the power supply lines, disturbances still occur that do not via the antenna, but in some other way into the receiver. These disorders can be avoided by, as is known with measuring cages and # read transmitters, the shielded receiver or part of the receiver in a second shield arranges which with the first shield only on one or close to each other Places conductively connected and insulated for the rest.

Es ist auch bekannt, daß durch die Abuchirmwände hindurchgehende Leitungen die Abschirmwirkung um Größenordnungen herabmindern, wenn die Leitungen nicht verdrosseltwerden.It is also known to have lines extending through the screen walls reduce the shielding effect by orders of magnitude if the lines are not choked.

Die Abschirmwirkung kann auch durch eine Antriebswelle beeinträchtigt werden, die in das Innere des Empfängers führt. Erfindungsgemäß wird dieser Nachteil dadurch vermieden, daß die metallische Antriebswelle (biegsame Welle) nicht nur von der inneren Abschirmung isoliert, sondern durch Anwendung von Isoliermaterial auch so ausgebildet ist, daß der metallische Teil der Welle nicht durch die äußere Abschirmung hindurchgeht.The shielding effect can also be impaired by a drive shaft that leads into the interior of the receiver. According to the present invention, this disadvantage becomes avoided by the fact that the metallic drive shaft (flexible shaft) not only isolated from the inner shield, but by applying insulating material is also designed so that the metallic part of the shaft does not pass through the outer Shield passes through.

Es ist bekannt, eine Antriebswelle im 'Innern eines Empfängers aus Isoliermaterial herzustellen, um die sogenannte Handkapazität zu vermeiden.. Bei diesem bekannten Empfänger ohne Doppelabschirmung führt die metallische Achse durch die Vorderwand lies Empfängers hindurch und geht dann erst in eine Isolierachse über. Diese Anordnung würde zur Störbefreiung nicht genügen.It is known to consist of a drive shaft inside a receiver Manufacture insulating material in order to avoid the so-called hand capacitance .. At This known receiver without double shielding carries out the metallic axis the front wall reads the receiver through and only then goes into an isolating axis above. This arrangement would not be sufficient to eliminate interference.

In der Abbildung ist eine beispielsweise Ausführungsform der Erfindung dargestellt. Das allseitig geschlossene Chassis Ch des Empfängers dient als erste Abschirmung und das Empfängergehäuse G als zweite Abschirmung. Auf dem Chassis befinden sich in Abschirmkästen die Kondensatoren und Spulen. Die metallische Verbindung zwischen Chassis und Gehäuse erfolgt nur an einer einzigen Stelle Z'. Im übrigen ist das Chassis von dem Gehäuse isoliert. Die Stromzuführung und Antennenzuführung befinden sich zweckmäßigerweise in der Nähe der Verbindung L'.The figure shows an exemplary embodiment of the invention shown. The receiver's chassis, which is closed on all sides, serves as the first Shield and the receiver housing G as a second shield. Located on the chassis The capacitors and coils are located in shielding boxes. The metallic connection between the chassis and the housing occurs only at a single point Z '. Furthermore the chassis is isolated from the housing. The power supply and antenna supply are conveniently located near the connection L '.

Damit die Antriebswelle (biegsame Welle) für die Abstimmung keine Störungen in den Empfänger bringt, muß sie nicht nur von der inneren Abschirmung isoliert sein, sondern sie wird auch so ausgebildet, daß der metallische Teil überhaupt nicht durch die äußere Abschirmung hindurchgeht.So that the drive shaft (flexible shaft) for voting no If interference brings into the receiver, it does not only have to come from the inner shielding be isolated, but it is also designed so that the metallic part at all does not pass through the outer shield.

Die Erfindung ist besonders dann amvendbar, wenn die Störungen kurzwelliger Art sind, wie sie von den Zündkerzen von Automobilen erzeugt werden.The invention is particularly applicable when the interference is short-wave Kind of how they are produced by the spark plugs of automobiles.

Claims (1)

PATENTANSPRUCH: Hochfrequenzempfänger, insbesondere Kraftwagenempfänger, bei dem Hochfrequenzspannung führende Teile in einem besonderen Abschirmkasten innerhalb eines größeren Abschirmkasten untergebracht sind und der innere Abschirmkasten isoliert in. dem anderen aufgestellt und mit diesem nur an einen einzigen Punkt leitend verbunden ist, dadurch gekennzeichnet, daß die metallische Antriebswelle (biegsame Welle) nicht nur von der inneren Abschirmung isoliert. sondern durch Anwendung von Isoliermaterial auch so ausgebildet ist, daß der metallische Teil der Welle nicht durch die i 'itil', Aere Abschirinun- Z, hindurch-eht. 2-1PATENT CLAIM: high-frequency receivers, especially vehicle receivers, parts carrying high frequency voltage in a special shielding box inside a larger shielding box are housed and the inner shielding box is isolated set up in. the other and with this only conductively connected at a single point is characterized in that the metallic drive shaft (flexible shaft) not just isolated from the inner shield. but by using insulating material is also designed so that the metallic part of the shaft does not pass through the i 'itil', Aere Abschirinun-Z, through-eht. 2-1
DET46254D 1936-01-14 1936-01-14 High-frequency receivers with shields, in particular motor vehicle receivers Expired DE737870C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET46254D DE737870C (en) 1936-01-14 1936-01-14 High-frequency receivers with shields, in particular motor vehicle receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET46254D DE737870C (en) 1936-01-14 1936-01-14 High-frequency receivers with shields, in particular motor vehicle receivers

Publications (1)

Publication Number Publication Date
DE737870C true DE737870C (en) 1943-07-28

Family

ID=7562267

Family Applications (1)

Application Number Title Priority Date Filing Date
DET46254D Expired DE737870C (en) 1936-01-14 1936-01-14 High-frequency receivers with shields, in particular motor vehicle receivers

Country Status (1)

Country Link
DE (1) DE737870C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971301C (en) * 1951-03-31 1959-01-08 Rohde & Schwarz Tube voltmeter for determining direct or alternating current measured values
EP0225954A1 (en) * 1985-12-18 1987-06-24 Alcan International Limited Protection for control equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971301C (en) * 1951-03-31 1959-01-08 Rohde & Schwarz Tube voltmeter for determining direct or alternating current measured values
EP0225954A1 (en) * 1985-12-18 1987-06-24 Alcan International Limited Protection for control equipment

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