# US 4,394,190 A · Magnetic gate and method of production thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,394,190 A
- Document ID: US4394190A
- Status: Granted
- Kind: A
- Application number: 06/225,686
- Filed: 1981-01-16
- Granted: 1983-07-19
- Earliest claimed: 1980-01-18
- Assignees: Siemens Aktiengesellschaft
- Inventors: Wilhelm Ertl; Ulrich Lachmann; Heinrich Pertsch
- Web page: https://patentgrep.com/patent/US4394190A

## CPC

- H03K 17/97: using a magnetic movable element
- G01V 3/08: operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices (with electromagnetic waves G01V3/12)
- Y10T 29/49105: Switch making
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Magnetic gate, including a magnet having a magnetic pole with an at least partly flat surface, a semiconductor chip having an integrated circuit, a mechanically permeable metal piece, and means attaching the semiconductor chip to the magnetically permeable metal piece for minimizing mechanical stresses acting on the chip to eliminate piezo effects and method of production thereof.

## Claims

### Claim 1

Magnetic gate, comprising a magnetically permeable metal piece having first and second parts being spaced apart from each other, a pole shoe being integral with said second part of said metal piece and protruding toward said first part of said metal piece, a thin intermediate carrier being firmly connected to said pole shoe, finger-like contact structures integral with said intermediate carrier, a semiconductor chip having an integrated circuit being soldered to said finger-like contact structures, a synthetic material plate with contact structures being disposed on said intermediate carrier, outer junction wires being connected to outer ends of said contact structures of said synthetic material plate, a magnet being fastened to said first part of said metal piece and protruding toward said second part of said metal piece, said magnet having a magnetic pole with an at least partly flat surface being opposite said pole shoe and semiconductor chip defining an open space therebetween, said first and second parts of said metal piece being separated by the direct interposition of said magnet, open space, semiconductor chip and pole shoe, and synthetic insulation material embedding and fixing said metal piece, magnet and pole shoe in place.

### Claim 2 (depends on 1)

Magnetic gate according to claim 1, including a prefabricated housing enclosing said metal piece, said synthetic insulation material filling said housing with the exception of said open space between said magnet and said semiconductor chip and pole shoe.

### Claim 3 (depends on 1)

Magnetic gate according to claim 1, wherein said synthetic insulation material is epoxy resin.

### Claim 4 (depends on 1)

Magnetic gate according to claim 1, wherein said magnet is a samarium-cobalt magnet.