Method for the production of an inductive component element

• US 3,874,075 A
• Filed: 10/26/1973
• Issued: 04/01/1975
• Est. Priority Date: 10/31/1972
• Status: Expired due to Term

• Current Assignee: Hartwig Lohse
• Original Assignee: Hartwig Lohse
• Inventors: Lohse, Hartwig
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US05/410,237
• Time in Patent Office: 522 Days
• Field of Search: 29/602,625,605 336/200,221,223,233,229 219/121L,121LM 117/45,212,234
• US Class Current: 29/602.1
• CPC Class Codes: B23K 2103/50 Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
• CPC Class Codes: B23K 26/40 taking account of the properties of the material involved
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A method for producing an inductive component element in which a magnetic core is covered at least partially with a non-magnetic, metallic layer which is thereafter impacted with a laser beam to partially sever selected portions of the metallic layer from other portions thereof to the finally generally helically shaped inductive coil, a layer of insulating material being interposed between the metallic layer and the magnetic core if the latter is constructed of a magnetic material having insufficient insulating properties.

Claims

1. A method for the production of an inductive component element, comprising the steps of applying a non-magnetic layer to and at least partially covering a magnetic core of rectangular, ring-shaped configuration having generally oppositely disposed faces connected by respective edge portions, and impacting the layer with a laser beam, incident at an angle of less than 90*, to partially sever selected portions of the layer from other portions thereof on both the faces and adjoining edge portions, and thereby define a generally helically shaped inductive coil.

2. A method according to claim 1, comprising the further step of applying an insulating intermediate layer directly upon the magnetic core prior to the application of said metallic layer.

3. A method according to claim 1, wherein a selected base and edge portions are initially impacted, the core rotated through 180* about an axis operative to correspondingly dispose the other face of the core and corresponding edge portions for beam impact, and thereafter impacting the last-mentioned face and edge portions with said laser beam.

4. A method for the production of an inductive component element, comprising the steps of applying a non-magnetic metallic layer to and at least partially covering a magnetic core of ring-like configuration, comprising a pair of spaced longitudinally extending side portions connected at their ends by respective transversely extending side portions, impacting the layer with a laser beam to partially sever selected portions of the layer from other portions thereof, while advancing the core in the direction of the longitudinal side portions (Y-direction) by an amount to provide a desired spiral pitch, and reciprocating back and forth in the direction of its transverse side portions (X-direction) by an amount which is greater than the width of the longitudinal side portions, subsequently rotating the ring core 180* about an axis in the X-Y plane, and repeating such advancing and reciprocating steps while impacting the core, whereby the metallic layer is divided into a generally helically shaped inductive coil by the action of said laser beam.

5. A method according to claim 4, comprising impacting the metallic layer with such laser beam at an angle of approximately 45* with respect to the XY-plane and at an angle with respect to the X- or Y-axis, respectively, at an angle determined by the ring core thickness and the desired spiral pitch.

6. A method according to claim 5, comprising the further step of applying an insulating intermediate layer directly upon the magnetic core piror to the application of said metallic layer.