Resistor

Patent metadata

Field	Value
Publication number	US-11810697-B2
Application number	US-202017606612-A
Country	US
Kind code	B2
Filing date	May 8, 2020
Priority date	May 15, 2019
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A resistor includes a resistive element including a first surface and a second surface; a protective film having electrical insulating properties disposed on the first surface; and a pair of electrodes in contact with the resistive element. The protective film includes a first outer edge and a second outer edge. The resistive element includes a first slit and a second slit extending from the first surface through to the second surface and extending in the second direction. The first slit is located closest to the first outer edge; and the second slit is located closest to the second outer edge. As viewed in the thickness direction, a first distance from the first outer edge to the first slit and a second distance from the second outer edge to the second slit together have a length 15% or greater of a dimension of the protective film in the first direction.

First claim

The invention claimed is:

1. A resistor, comprising:
a resistive element including a first surface and a second surface facing opposite sides in a thickness direction;
a protective film disposed on the first surface and having electrical insulating properties; and
a pair of electrodes spaced apart from each other in a first direction perpendicular to the thickness direction, the pair of electrodes being held in contact with the resistive element,
wherein the protective film includes a first outer edge and a second outer edge that are spaced apart from each other in the first direction and each extend in a second direction perpendicular to the thickness direction and the first direction;
the resistive element includes a first slit and a second slit each extending from the first surface through to the second surface and extending in the second direction;
the first slit is located closest to the first outer edge;
the second slit is located closest to the second outer edge; and
as viewed in the thickness direction, a first distance between the first outer edge and the first slit and a second distance between the second outer edge and the second slit together have a length 15% or greater of a dimension of the protective film in the first direction,
as viewed in the thickness direction, a minimum distance between the pair of electrodes is smaller than each of the first distance and the second distance.

2. The resistor according to claim 1 , wherein as viewed in the thickness direction, the first distance and the second distance are equal to each other.

3. The resistor according to claim 2 , wherein each one of the pair of electrodes includes a bottom portion opposite to the resistive element with respect to the protective film in the thickness direction; and
the bottom portion of each one of the pair of electrodes includes a portion overlapping with a portion of the protective film as viewed in the thickness direction.

4. The resistor according to claim 3 , wherein the protective film is made of a material including a synthetic resin.

5. The resistor according to claim 4 , wherein the protective film includes a filler made of a material including a ceramic.

6. The resistor according to claim 3 , wherein the first slit overlaps with the bottom portion of one of the pair of electrodes as viewed in the thickness direction; and
the second slit overlaps with the bottom portion of the other one of the pair of electrodes as viewed in the thickness direction.

7. The resistor according to claim 6 , wherein as viewed in the thickness direction, the first distance and the second distance together have a length 30% or less of the dimension of the protective film in the first direction.

8. The resistor according to claim 3 , wherein the resistive element includes a pair of first end surfaces spaced apart from each other in the first direction and connected to both the first surface and the second surface;
each one of the pair of electrodes includes a side portion jutting out in the thickness direction and connected to the bottom portion of one of the pair of electrodes; and
the side portion of each one of the pair of electrodes is in contact with one of the pair of first end surfaces.

9. The resistor according to claim 8 , further comprising an insulating plate disposed on the second surface and made of a material including a synthetic resin,
wherein the resistive element includes a pair of second end surfaces that are connected to the first surface and the second surface and spaced apart from each other in the second direction; and
the pair of second end surfaces are covered by the insulating plate.

10. The resistor according to claim 9 , wherein each of the side portions of the pair of electrodes is in contact with the insulating plate.

11. The resistor according to claim 9 , wherein the first slit extends in the second direction from one surface of the pair of second end surfaces; and
the second slit extends in the second direction from the other surface of the pair of second end surfaces.

12. The resistor according to claim 11 , wherein the insulating plate includes a portion extending into the first slit and the second slit in the thickness direction.

13. The resistor according to claim 12 , wherein each of the first slit and the second slit includes a pair of side walls spaced apart from each other in the first direction; and
each one of the pair of side walls includes a portion recessed in the first direction.

14. The resistor according to claim 9 , wherein the resistive element includes a projection projecting in the second direction from one of the pair of second end surfaces;
the projection is connected to one of the pair of first end surfaces; and
the bottom portion of one of the pair of electrodes is in contact with the projection.

15. The resistor according to claim 8 , wherein the resistive element includes a plurality of grooves recessed in the first surface and each extending in a predetermined direction; and
the protective film meshes with the plurality of grooves.

16. The resistor according to claim 8 , further comprising a pair of intermediate layers located between the resistive element and the bottom portion of the pair of electrodes in the thickness direction,
wherein each one of the pair of intermediate layers includes a cover portion covering a portion of the protective film; and
the bottom portion of each one of the pair of electrodes is in contact with the cover portion of one of the pair of intermediate layers.

17. The resistor according to claim 16 , wherein the first outer edge and the second outer edge are located between the pair of first end surfaces as viewed in the thickness direction;
the first surface includes a first region and a second region not covered by any one of the protective film and the pair of intermediate layers;
the first region is located between the first outer edge and one of the pair of first end surfaces located closest to the first outer edge;
the second region is located between the second outer edge and one of the pair of first end surfaces located closest to the second outer edge; and
each of the first region and the second region is in contact with the bottom portion of one of the pair of electrodes.

Assignees

• Rohm Co Ltd

Inventors

• YAKATA Atsuki

Classifications

• H01C7/003

  Thick film resistors · CPC title

• H01C1/148

  the terminals embracing or surrounding the resistive element (H01C1/142 takes precedence) · CPC title

• H01C17/242

  by laser · CPC title

• H01C1/028

  the resistive element being embedded in insulation with outer enclosing sheath · CPC title

• H01C1/142 Primary

  the terminals or tapping points being coated on the resistive element · CPC title