Toroidal printed coil

• US 6,686,824 B1
• Filed: 01/28/2000
• Issued: 02/03/2004
• Est. Priority Date: 05/29/1998
• Status: Expired due to Fees

• Current Assignee: Nissha Printing Company Limited
• Original Assignee: Nissha Printing Company Limited
• Inventors: Yamamoto, Kunitoshi
• Primary Examiner(s): Vo, Peter
• Assistant Examiner(s): TRINH, MINH N
• Application Number:
  US09/463,630
• Time in Patent Office: 1,467 Days
• Field of Search: 296/021, 296/06, 296/05, 298/46, 298/30, 296/00, 296/01, 296/030.1, 336/200, 336/83, 336/221
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 17/0033 with the coil helically wound around a magnetic core
• CPC Class Codes: H02K 3/26 consisting of printed conductors
• CPC Class Codes: H05K 1/165 incorporating printed inductors
• CPC Class Codes: H05K 2201/09063 Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: H05K 2201/097 Alternating conductors, e.g. alternating different shaped pads, twisted pairs; Alternating components
• CPC Class Codes: H05K 3/0082 characterised by the exposure method of radiation-sensitive masks
• CPC Class Codes: H05K 3/064 Photoresists
• CPC Class Codes: H05K 3/403 Edge contacts; Windows or holes in the substrate having plural connections on the walls thereof H05K3/4092 takes precedence
• CPC Class Codes: Y10T 29/49018 with other electrical component
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49073 by assembling coil and core
• CPC Class Codes: Y10T 29/49126 Assembling bases
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base

Abstract

A toroidal printed coil includes a plurality of annular holes (2) and a plurality of center holes (3) surrounded by the annular holes (2) in an insulating substrate (1). A plurality of annular juts (4), each comprising a portion surrounded by the annular hole (2) and the center hole (3), are formed. A printed coil sheet having a plurality of toroidal printed coils, in which a conductor film (6) is spirally formed at front-and-rear surfaces and side surfaces of annular portions (5) of the annular juts (4) with each annular portion taken as an axis, is obtained. With this printed coil sheet, a plurality of toroidal printed coils (P) are obtained by cutting the insulating substrate (1) off from the individual annular juts (4).

Claims

1. A toroidal printed coil comprising:

an insulating substrate having an annular portion, a connection portion, a center hole formed in said annular portion, a base portion, and a C-shaped annular hole arranged such that said annular portion is formed between said center hole and said C-shaped annular hole, and such that said annular portion is connected to said base portion by said connection portion; and

a conductor film strip formed around said annular portion of said insulating substrate in a helical manner with respect to an annular axis of said annular portion so as to form conductor film on a front surface, a rear surface, an inner surface, and an outer surface of said annular portion.

2. The toroidal printed coil of claim 1, wherein said conductor film strip has a first end terminal at a first end of said conductor film strip and a second end terminal at a second end of said conductor film strip opposite said first end, said first end terminal and said second end terminal being arranged on said connection portion.

3. The toroidal printed coil of claim 1, wherein said conductor film strip extends an entire length of said annular portion so as to surround said center hole.

4. The toroidal printed coil of claim 1, wherein an inner periphery of said annular portion and an outer periphery of said annular portion have a polygonal configuration.

5. The toroidal printed coil of claim 1, wherein a first one of an inner periphery of said annular portion and an outer periphery of said annular portion has a polygonal configuration, and a second one of said inner periphery and said outer periphery has a circular configuration.