Flexible printed circuit board

• US 10,653,007 B2
• Filed: 06/22/2016
• Issued: 05/12/2020
• Est. Priority Date: 06/24/2015
• Status: Active Grant

• Current Assignee: Autonetworks Technologies, Ltd. (Sumitomo Corporation), Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Wiring Systems Limited (Sumitomo Corporation), Sumitomo Electric Printed Circuits, Inc.
• Original Assignee: Sumitomo Electric Printed Circuits, Inc.
• Inventors: Tsumagari, Takayuki, Uchita, Yoshifumi, Takase, Shinichi, Saito, Hirohisa
• Primary Examiner(s): Patel, Ishwarbhai B
• Application Number:
  US15/738,301
• Publication Number:
  US 20180192511A1
• Time in Patent Office: 1,420 Days
• CPC Class Codes: H01H 2085/0275 Structural association with a printed circuit board
• CPC Class Codes: H01H 69/022 of printed circuit fuses
• CPC Class Codes: H01H 85/0241 Structural association of a fuse and another component or apparatus switches with built-in fuses H01H9/10, spark-gap arresters H01H85/44, transformers and inductances H01F27/402, capacitors H01G2/14, lamps H01K1/66, semiconductors H01L23/5256 or H01L23/62
• CPC Class Codes: H01H 85/046 Fuses formed as printed circuits
• CPC Class Codes: H01H 85/10 with constriction for localised fusing H01H85/11 takes precedence
• CPC Class Codes: H05K 1/0256 Electrical insulation details, e.g. around high voltage areas
• CPC Class Codes: H05K 1/0257 Overvoltage protection
• CPC Class Codes: H05K 1/028 Bending or folding regions of flexible printed circuits H05K1/0283 takes precedence
• CPC Class Codes: H05K 1/0293 Individual printed conductors which are adapted for modification, e.g. fusable or breakable conductors, printed switches
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups
• CPC Class Codes: H05K 2201/09063 Holes or slots in insulating substrate not used for electrical connections
• CPC Class Codes: H05K 2201/09727 Varying width along a single conductor; Conductors or pads having different widths
• CPC Class Codes: H05K 2201/10181 Fuse
• CPC Class Codes: H05K 2203/068 Features of the lamination press or of the lamination process, e.g. using special separator sheets
• CPC Class Codes: H05K 2203/107 Using laser light shaping a substrate by laser ablation H05K3/0026
• CPC Class Codes: H05K 3/0026 by laser ablation
• CPC Class Codes: H05K 3/005 Punching of holes
• CPC Class Codes: H05K 3/027 the conductive material being removed by irradiation, e.g. by photons, alpha or beta particles
• CPC Class Codes: H05K 3/064 Photoresists

Abstract

A flexible printed circuit board according to an aspect of the present invention includes a base film having insulating properties and a conductive pattern laminated to one surface side of the base film. The conductive pattern forms part of a circuit and includes at least one fuse portion having a cross section smaller than the other part. The flexible printed circuit board includes at least one opening passing through front and rear surfaces on at least one of the right and left sides of the fuse portion in a two-dimensional view.

Claims

1. A flexible printed circuit board comprising:

a base film having insulating properties;

a conductive pattern laminated to one surface side of the base film; and

an insulation layer disposed on the one surface side of the base film,

the conductive pattern forming part of a circuit and including at least one fuse portion having a cross section smaller than the other part of the circuit,

wherein the flexible printed circuit board comprises at least one opening portion passing through front and rear surfaces on at least one of right and left sides of the fuse portion in a two-dimensional view, a portion of the opening portion being closest to a side edge of the fuse portion is located only at a center region of the side edge in the two-dimensional view, and the center region is a region excluding a range of 30% of the entire length of the fuse portion from each of both ends in the length direction of the fuse portion.

2. The flexible printed circuit board according to claim 1, wherein there are the base film and the insulation layer laminated thereon between the fuse portion and the opening portion.

3. The flexible printed circuit board according to claim 1, wherein the portion of the opening portion is parallel to the side edge of the fuse portion.

4. The flexible printed circuit board according to claim 1, wherein the fuse is formed so as to have a line width smaller than the conductive pattern in front and back, and the portion of the opening portion protrudes toward the fuse portion beyond a line connecting side edges of the conductive pattern in front and back of the fuse portion.

5. A flexible printed circuit board comprising:

a base film having insulating properties;

a conductive pattern laminated to one surface side of the base film; and

an insulation layer disposed on the one surface side of the base film,

the conductive pattern forming part of a circuit and including at least one fuse portion having a cross section smaller than the other part of the circuit,

wherein the flexible printed circuit board comprises at least one opening portion passing through front and rear surfaces on at least one of right and left sides of the fuse portion in a two-dimensional view, a portion of the opening portion being closest to a side edge of the fuse portion is located only at a center region of the side edge in the two-dimensional view, and the opening portion is located only at the center region of the side edge.

6. The flexible printed circuit board according to claim 5, wherein there are the base film and the insulation layer laminated thereon between the fuse portion and the opening portion.

7. The flexible printed circuit board according to claim 5, wherein the portion of the opening portion is parallel to the side edge of the fuse portion.

8. The flexible printed circuit board according to claim 5, wherein the fuse is formed so as to have a line width smaller than the conductive pattern in front and back, and the portion of the opening portion protrudes toward the fuse portion beyond a line connecting side edges of the conductive pattern in front and back of the fuse portion.