US 6,150,920 AGranted

Resistor and its manufacturing method

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsMasato Hashimoto, Shogo Nakayama, Shoji Mori, Naohiro Takashima, Seiji Tsuda, Takumi Shirai

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Abstract

The present invention is to offer a resistor which can be mounted exactly on the terminals disposed on a circuit board regardless the sides of the resistor, and to offer its manufacturing method by forming the surface of the side-electrode layer at a height higher than the surface of protection layer, or by forming the surface of the second surface electrode layer at a height higher than the surface of protection layer. By these, the resistor can be mounted exactly on the terminal of circuit board at a high yield. Furthermore, since the first surface electrode layer and the second upper electrode layer are electrically connected together through a window provided on the protection layer, a higher connection reliability can be obtained.

Claims16

Dependent claims

A resistor comprising:

a substrate having an upper surface, a first surface electrode disposed on said upper surface of said substrate adjacent a first side surface of said substrate and a second surface electrode disposed on said upper surface of said substrate adjacent a second side surface of said substrate,
a resistor layer disposed on said upper surface of said substrate, said resistor layer electrically coupling said first surface electrode and said second surface electrode, said resistor layer extending over only a portion of the width of said substrate,
a protection layer covering said resistor layer,
a first side-electrode formed on the first side of said substrate and on said first surface electrode, said first side electrode electrically coupled to said first surface electrode, and
a second side-electrode formed on the second side of said substrate and on said second surface electrode, said second side electrode electrically coupled to said second surface electrode,
each of said first side-electrode and said second side-electrode having an upper surface which is separated from an upper surface of said protection layer by at least 5 microns,
wherein at least one of said first surface electrode and said second surface electrode is provided with at least one notch, said at least one notch including a planar surface which extends farther away from at least one of said first side surface and said second side surface than said at least one of said first surface electrode and said second surface electrode.

4 more elements

A resistor comprising:

a substrate having an upper surface and a bottom surface, a first surface electrode disposed on said upper surface of said substrate adjacent a first side surface of said substrate and a second surface electrode disposed on said upper surface of said substrate adjacent a second side surface of said substrate,
a first back electrode disposed on said bottom surface of said substrate adjacent a first side surface of said substrate and a second back electrode disposed on said bottom surface of said substrate adjacent a second side surface of said substrate,
a resistor layer disposed on said upper surface of said substrate, said resistor layer electrically coupling said first surface electrode and said second surface electrode, said resistor layer extending over only a portion of the width of said substrate,
a protection layer covering said resistor layer,
a first side-electrode formed on the first side of said substrate, said first surface electrode and said first back electrode, said first side electrode electrically coupled to said first surface electrode and said first back electrode, and
a second side-electrode formed on the second side of said substrate, said second surface electrode and said second back electrode, said second side electrode electrically coupled to said second surface electrode and said second back electrode,
each of said first side-electrode and said second side-electrode having an upper surface which is separated from an upper surface of said protection layer by at least 5 microns,
wherein at least one of said first surface electrode and said second surface electrode is provided with at least one notch, said at least one notch including a planar surface which extends farther away from at least one of said first side surface and said second side surface than said at least one of said first surface electrode and said second surface electrode.

5 more elements

A resistor comprising:

a substrate having an upper surface, a first surface electrode disposed directly on said upper surface of said substrate adjacent a first side surface of said substrate and a second surface electrode disposed directly on said upper surface of said substrate adjacent a second side surface of said substrate,
a resistor layer disposed on said upper surface of said substrate, said resistor layer electrically coupling said first surface electrode and said second surface electrode, said resistor layer extending over only a portion of the width of said substrate,
a protection layer covering said resistor layer, said first surface electrode and said second surface electrode,
a third surface electrode disposed only on said protection layer adjacent said first side surface of said substrate, said third surface electrode not contacting said first surface electrode, and a fourth surface electrode disposed only on said protection layer adjacent said second side surface of said substrate, said fourth surface electrode not contacting said second surface electrode,
a first side-electrode forned on the first side of said substrate, said first side-electrode electrically coupled to said first surface electrode and said third surface electrode, and
a second side-electrode formed on the second side of said substrate, said second side electrode electrically coupled to said second surface electrode and said fourth surface electrode,
each of said first side-electrode and said second side-electrode having an upper surface which is separated from an upper surface of said protection layer by at least 5 microns,
wherein at least one of said third surface electrode and said fourth surface electrode is provided with at least one notch said at least one notch including a planar surface which extends farther away from at least one of said first side surface and said second side surface than said at least one of said third surface electrode and said fourth surface electrode.

5 more elements

A resistor comprising:

a substrate having an upper surface and a bottom surface, a first surface electrode disposed directly on said upper surface of said substrate adjacent a first side surface of said substrate and a second surface electrode disposed directly on said upper surface of said substrate adjacent a second side surface of said substrate,
a resistor layer disposed on said upper surface of said substrate, said resistor layer electrically coupling said first surface electrode and said second surface electrode, said resistor layer extending over only a portion of the width of said substrate,
a first back electrode disposed on said bottom surface of said substrate adjacent said first side surface of said substrate and a second back electrode disposed on said bottom surface of said substrate adjacent said second side surface of said substrate,
a protection layer covering said resistor layer, said first surface electrode and said second surface electrode,
a third surface electrode disposed only on said protection layer adjacent said first side surface of said substrate, said third surface electrode not contacting said first surface electrode, and a fourth surface electrode disposed only on said protection layer adjacent said second side surface of said substrate, said fourth surface electrode not contacting said second surface electrode,
a first side-electrode formed on the first side of said substrate, said first side-electrode electrically coupled to said first surface electrode, said first back electrode and said third surface electrode, and
a second side-electrode formed on the second side of said substrate, said second side electrode electrically coupled to said second surface electrode, said second back electrode and said fourth surface electrode,
each of said first side-electrode and said second side-electrode having an upper surface which is separated from an upper surface of said protection layer by at least 5 microns,
wherein at least one of said third surface electrode and said fourth surface electrode is provided with at least one notch, said at least one notch including a planar surface which extends farther away from at least one of said first side surface and said second side surface than said at least one of said third surface electrode and said fourth surface electrode.

6 more elements

A resistor comprising:

a substrate having an upper surface, a first surface electrode disposed directly on said upper surface of said substrate adjacent a first side surface of said substrate and a second surface electrode disposed directly on said upper surface of said substrate adjacent a second side surface of said substrate,
a resistor layer disposed on said upper surface of said substrate, said resistor layer electrically coupling said first surface electrode and said second surface electrode, said resistor layer extending over only a portion of the width of said substrate,
a protection layer covering said resistor layer, said first surface electrode and said second surface electrode,
a third surface electrode disposed on said protection layer adjacent said first side surface of said substrate, and a fourth surface electrode disposed on said protection layer adjacent said second side surface of said substrate, said third surface electrode having projections extending toward said fourth surface electrode, said fourth surface electrode having projections extending toward said third surface electrode,
a first side-electrode formed on the first side of said substrate, said first side-electrode electrically coupled to said first surface electrode and said third surface electrode, and
a second side-electrode forned on the second side of said substrate, said second side electrode electrically coupled to said second surface electrode and said fourth surface electrode,
each of said first side-electrode and said second side-electrode having an upper surface which is separated from an upper surface of said protection layer by at least 5 microns,
wherein said protection layer comprises a plurality of windows which expose portions of said first surface electrode and said second surface electrode, said third surface electrode being electrically coupled to said first surface electrode through one of said plurality of windows, said fourth surface electrode being electrically coupled to said second surface electrode through one of said plurality of windows,
wherein at least one of said third surface electrode and said fourth surface electrode is provided with at least one notch, said at least one notch including a planar surface which extends farther away from at least one of said first side surface and said second side surface than said at least one of said third surface electrode and said fourth surface electrode.

6 more elements

A resistor comprising:

a substrate having an upper surface and a bottom surface, a first surface electrode disposed directly on said upper surface of said substrate adjacent a first side surface of said substrate and a second surface electrode disposed directly on said upper surface of said substrate adjacent a second side surface of said substrate,
a resistor layer disposed on said upper surface of said substrate, said resistor layer electrically coupling said first surface electrode and said second surface electrode, said resistor layer extending over only a portion of the width of said substrate,
a first back electrode disposed on said bottom surface of said substrate adjacent said first side surface of said substrate and a second back electrode disposed on said bottom surface of said substrate adjacent said second side surface of said substrate,
a protection layer covering said resistor layer, said first surface electrode and said second surface electrode,
a third surface electrode disposed on said protection layer adjacent said first side surface of said substrate and a fourth surface electrode disposed on said protection layer adjacent said second side surface of said substrate, said third surface electrode having projections extending toward said fourth surface electrode, said fourth surface electrode having projections extending toward said third surface electrode,
a first side-electrode formed on the first side of said substrate, said first side-electrode electrically coupled to said first surface electrode, said first back electrode and said third surface electrode, and
a second side-electrode formed on the second side of said substrate, said second side electrode electrically coupled to said second surface electrode, said second back electrode and said fourth surface electrode,
each of said first side-electrode and said second side-electrode having an upper surface which is separated from an upper surface of said protection layer by at least 5 microns,
wherein said protection layer comprises a plurality of windows which expose portions of said first surface electrode and said second surface electrode, said third surface electrode being electrically coupled to said first surface electrode through one of said plurality of windows, said fourth surface electrode being electrically coupled to said second surface electrode through one of said plurality of windows,
wherein at least one of said third surface electrode and said fourth surface electrode is provided with at least one notch, said at least one notch including a planar surface which extends farther away from at least one of said first side surface and said second side surface than said at least one of said third surface electrode and said fourth surface electrode.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/865,110Filed 29 May 1997
Priority: JP 8-13461829 May 1996
Granted: 21 Nov 2000
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01C 17/28
Apparatus or processes specially adapted for manufacturing resistors: adapted for applying terminals
H01C 1/142
Terminals or tapping points specially adapted for resistors; Arrangements of terminals or tapping points on resistors: the terminals or tapping…
H01C 17/006
Apparatus or processes specially adapted for manufacturing resistors: adapted for manufacturing resistor chips
H05K 3/3431
Surface mounted components: leadless components