DE8507560U1 - Electric keypad - Google Patents

Description

SAMSON & ᚠ'

PATEMTANWALTE WKjeNMAYEflSTR 5 FR by SAMSONHIMMELSTJERNA ατπΜΤΔ MU / A I TCV A N7I KI DWOO MUNICH 22 MV-PHVS PATENT LAW FIRM TELEPHONE 0 99/22 9 * 61

DU TAMA by BULOW -J- TELEORAM: SAMPAT

CKFt ING. DIPL WIFtTSCH ING TELEX 521 4940 egu d

FAX: 0 89/29 94 pp

IHB JEICHEN OUR SIGN OATUM:

R 10/32-B 83 Gbm March 14, 1985 vB / ha

Applicant;
Wilhelm Ruf KG
Schwanthalerstrasse 18

8000 Munich 2

Electric keypad

description

The innovation relates to an electric keypad according to the preamble of claim 1. Such a keypad is known from DE-OS 32 15 191 as a "contact matrix". The matrix is as flexible printed circuit board with arranged in a delimited field in one plane, by attachable bridges formed galvanically connectable contact points and has laterally protruding beyond this field than Connection cable usable flexible tail. These runners form a "wire harness". On their free ones Their ends are formed into connection contacts that are soldered or pluggable to another

PCB, a cable connector, etc. can be used are. In the field surrounding the contact points, the flexible film is stiffened with a carrier plate. With this known contact matrix, the connection “cable harness” is ultimately made with the carrier material integrated into the contact matrix.

A similar contact matrix is known from DE-OS-52 23 857. There, those assigned to the matrix take effect Light-emitting diodes with their connecting wires through holes in the flexible substrate and in the carrier plate in Solder eyes on the back. The light-emitting diodes are on the opposite side of the "cable harness" Side of the field bounding the contact points arranged.

From DE-OS 30 41 544 a keyboard with a rigid circuit board is known in which the conductor tracks in Form of a "cable harness" are led out laterally from the contact field.

A similar keypad is also known from DE-OS 31 35 164. Layered keypads with im essential rigid carrier plates are also known from DE-OS 32 27 457 and 33 08 776.

With all these keypads the problem arises that the "cable harness" has plug connections or sepago rate solder joints must be connected to another circuit board, which electronic components which are controlled via the keypad. These connectors are complex in the Production and failure-prone in operation.

The task of the innovation is therefore to improve the keypad of the type mentioned at the outset in such a way that it is more interference-free in operation with a simple structure and at the same time a complete, functional unit forms.

According to the innovation, this object is achieved in that the film has a further delimited field, in which electrical or electronic components are arranged and that the conductor tracks are arranged between the two demarcated fields.

Advantageous refinements and developments of the innovation can be found in the subclaims.

The innovation thus integrates on a single carrier material, namely that designed as a flexible film PCB the functional groups keypad, "cable harness" and electronics. Plug-in or soldered connections between separate circuit boards thus no longer have to be produced, whereby a higher functional reliability is given with a simplified and more compact structure.

The first delimited area with the contact points is made in a conventional manner, for example as in Described prior art described at the beginning, completed to a key or switch field. The electrical or electronic components or components in the second delimited field are also applied in a conventional manner, for example by soldering in SMD technology or in conventional technology with through the film

plugged connection pins of the components and soldered them on the other side. As the whole Keypad with "wiring harness" and electronics is built on a continuous flexible film There are also cheaper installation options in housings, which enables a space-saving overall construction. Even xst the assembly work is reduced and the overall height can be reduced. Cups; For ile construction With specific circuits, the flexibility means that it can be easily adapted to almost any housing design.

The innovation is explained in more detail below using an exemplary embodiment. The only

Fig. 1 shows an embodiment of the electric keypad according to the invention on Example of a keypad for a telephone receiver.

On a continuous flexible film 1 made of flexible, heat-resistant plastic such. B. Polyimide or polyester or an epoxy glass resin fabric, a first delimited field 2 is arranged.

In this field, contact points for electrical switches 3 are applied in one plane on the film. For this purpose, sections of electrical conductor tracks, for example applied ones, are applied in a known manner Copper tracks designed so that an electrical Connection and thus a closing of the switch is accomplished. The contact points open in a known manner into electrical conductor tracks which lead out laterally from the first delimited field are and are essentially parallel

run so that they ultimately form a kind of "wiring harness". These conductor tracks 4 (of the “cable harness ¹¹ ) open into a second delimited field 5, which is also arranged at a distance from the first delimited field 2 on the flexible film 1. In this second delimited field, electrical or electronic components 6, 7 or 8 arranged and electrically connected to the ends of the conductor tracks 4.

In the example of the telephone receiver extend from the second delimited field 5 and that from the Conductor tracks 4 facing away from the side two conductor tracks which each open into a connection contact 9 which, for example, a mouthpiece of a telephone receiver is connected. In a similar way protrude from the first delimited field 2, namely likewise to the side facing away from the conductor tracks 4, connecting conductor trays 10 out, which open into connection contacts 11, where in the example of a telephone receiver the earpiece is connected.

The entire circuit structure required in the example of the telephone receiver is thus on a continuous, arranged flexible film 1, which are installed or used in the housing of the telephone receiver can that it adapts to its curved contour.

Of course, the innovation is not limited to telephone receivers. Rather, the basic idea is the The innovation can be used with any form of electrical keypad, for example also with Pocket calculators, remote control devices etc.

All technical details presented in the protection claims, the description and the drawing can be essential to the invention both individually and in any combination with one another.

Claims (3)

PATENT LAWYERS - WOENMAYERSTR. 5 FRwnSAMSON-HIMMELSTJERNA », TEMTnraiiTTCifAMTICI 0-8000 MUNICH 22 aPL-PHYS. PATENT LAW FIRM phone : ο eai22 9 * ei DR. TAM A. von BULOW TELEGRAM: SAMPAT DIPL -ING., DIPL.-WinTSCH.-ING. TELEX: 521 4Θ4Ο egsa d TELEFAX: O 89/2 «94 BS YOUR SIGN: OUR SIGN: R 10/32-B 83 Gbm March 14, 1985 vB / ha Applicant:
Wilhelm Ruf KG
Schwanthalerstrasse 18 8000 Munich 2 Electric keypad " Claims for protection \. 1. Electric keypad with one being flexible f Foil-shaped carrier, with in an ab- "delimited field arranged in one plane V contact points and with over the demarcated field laterally protruding conductor tracks applied to the flexible film, thereby marked lit · ■ · net that the film (1) has a further, delimited field (5) in which electrical or electronic components (6-8) are arranged and that the conductor tracks (4) between the two are arranged from delimited fields (2 and 5). 2. Electric keypad according to claim 1, characterized in that the film (1) consists of flexible, heat-resistant plastic, such as. B. polyimide or polyester. 3. Electric keypad according to claim 1 or 2, characterized in that the side over the the side facing away from the conductor tracks (4) at least one of the delimited fields (2, 5) further connecting conductor tracks (9, 10) protrude.