EP0029985A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Printed wiring board for recording or displaying information
Assignee: Toshiba Corp
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Filing: 1980-11-24
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Granted: —
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Expires: 2000-11-24
Abstract
Abstract This disclosure concerns printed wiring boards for recording or displaying information. The printed wiring board comprises an insulated substrate (12), a pluralityoffunctional elements (R11 ~ R15) placed on the insulated substrate, a plurality of strip wires (SA1- SA5, SB1 ~ SB5) formed on the insulated substrate, each of the strip wires connected to a respective functional element, and at least two of the strip wires having different lengths such that one is longerthan the other, each of said strip wires comprising a two layer portion and a single layer portion, said two layer portion comprising a lower layer (13) having a first resistivity and an upper layer (14) having a second resistivity which is lower than said first resistivity, said single layer portion (17) comprising the same material used for forming said lower layer, wherein the resistance of the single layer portion of said shorter strip wire is higher than the resistance of the single layer portion of said longer strip wire.
Inventors
- 👤 Tamio Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:59
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H05K1/167; B; B41; B41J; B41J2/00; B41J2/315; B41J2/32; B41J2/345; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1345; H05K2201/00; H05K2201/03; H05K2201/0302; H05K2201/0317; H05K2201/0332; H05K2201/0388; H05K2201/0391; H05K2201/09; H05K2201/09209; H05K2201/09218; H05K2201/09236
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
132 words
A printed wiring board for recording or displaying information comprising: an insulated substrate (11, 12); a plurality of functional elements (Rll - R15) placed on said insulated substrate; and a plurality of strip wires (SAl - SA5, SBl - SB5) formed on said insulated substrate, each of said strip wires connected to a respective functional element, and at least two of the strip wires having different lengths such that one is longer than the other, characterized in that each of said strip wires comprises a first portion having a first resistivity and a second portion having a second resistivity which is higher than said first resistivity, wherein the resistance of the second portion of said shorter strip wire is higher than the resistance of the second portion of said longer strip wire.
Claim 2
Dependent Claim
132 words
A printed wiring board for recording or displaying information comprising: an insulated substrate (11, 12); a plurality of functional elements (Rll - R15) placed on said insulated substrate; and a plurality of strip wires (SAl - SA5, SBl - SB5) formed on said insulated substrate, each of said strip wires connected to a respective functional element, and at least two of the strip wires having different lengths such that one is longer than the other, characterized in that each of said strip wires comprises a first portion having a first resistivity and a second portion having a second resistivity which is higher than said first resistivity, wherein the resistance of the second portion of said shorter strip wire is higher than the resistance of the second portion of said longer strip wire.
Claim 3
Dependent Claim
33 words
A printed wiring board of claim 1, wherein a length of the second portion of said shorter strip wire is longer than a length of the second portion of said longer strip wire.
Claim 4
Dependent Claim
32 words
A printed wiring board of claim 1, wherein a segment of the second portion of said shorter strip wire is smaller in cross-section than the second portion of said longer strip wire.
Claim 5
Dependent Claim
32 words
A printed wiring board of claim 3, wherein a segment of said second portion of said shorter strip wire is narrower in width than the second portion of said longer strip wire.
Claim 6
Dependent Claim
15 words
A printed wiring board of claim 2, wherein said functional elements are thermal resistive elements.
Claim 7
Dependent Claim
16 words
A printed wiring board of claim 2, wherein said functional elements are liquid crystal display elements.
Claim 8
Dependent Claim
15 words
A printed wiring board of claim 4, wherein said functional elements are thermal resistive elements.
Claim 9
Dependent Claim
16 words
A printed wiring board of claim 4, wherein said functional elements are liquid crystal display elements.
Claim 10
Dependent Claim
170 words
A printed wiring board for recording information comprising: a substrate (12) having a surface layer (11) of insulating material; a plurality of thermal resistive elements (Rll - R15) aligned on said substrate; and a plurality of strip wires (SAI - SA5, SBl - SB5) formed on said substrate, each of said strip wires connected to a respective thermal resistive element, and at least two of the strip wires having different lengths such that one is longer than the other, characterized in that each of said strip wires comprises a two layer portion and a single layer portion, said two layer portion comprising a lower layer (13) having a first resistivity and an upper layer (14) having a second resistivity which is lower than said first resistivity, said single layer portion (17) comprising the same material used for forming said lower layer (13), wherein the resistance of the single layer portion of said shorter strip wire is higher than the resistance of the single layer portion of said longer strip wire.
Claim 11
Dependent Claim
170 words
A printed wiring board for recording information comprising: a substrate (12) having a surface layer (11) of insulating material; a plurality of thermal resistive elements (Rll - R15) aligned on said substrate; and a plurality of strip wires (SAI - SA5, SBl - SB5) formed on said substrate, each of said strip wires connected to a respective thermal resistive element, and at least two of the strip wires having different lengths such that one is longer than the other, characterized in that each of said strip wires comprises a two layer portion and a single layer portion, said two layer portion comprising a lower layer (13) having a first resistivity and an upper layer (14) having a second resistivity which is lower than said first resistivity, said single layer portion (17) comprising the same material used for forming said lower layer (13), wherein the resistance of the single layer portion of said shorter strip wire is higher than the resistance of the single layer portion of said longer strip wire.
Claim 12
Dependent Claim
35 words
A printed wiring board of claim 9, wherein the length of the single layer portion of said shorter strip wire is longer than the length of the single layer portion of said longer strip wire.
Claim 13
Dependent Claim
35 words
A printed wiring board of claim 9, wherein a width of the single layer portion of said shorter strip wire is narrower than a width of the single layer portion of said longer strip wire.
Claim 14
Dependent Claim
56 words
A printed wiring board of claim 9, wherein said single layer portion comprises two cross-sectional segments, wherein one of the cross-sectional segments is smaller than the other cross-sectional segment, the length of the smaller cross-sectional segment of said shorter strip wire is longer than the length of the smaller cross-sectional segment of said longer strip wire.
Claim 15
Dependent Claim
56 words
A printed wiring board of claim 9, wherein said single layer portion comprises two cross-sectional segments, wherein one of the cross-sectional segments is smaller than the other cross-sectional segment, the width of the smaller cross-sectional segment of said shorter strip wire is narrower than the width of the smaller cross-sectional segment of said longer strip wire.
Claim 16
Dependent Claim
38 words
A printed wiring board of claim 9, wherein said lower layer of said two layer portion and said single layer portion is a conductive material selected from the group consisting of Cr, Ti, V, W, Nb and Mo.
Claim 17
Dependent Claim
32 words
A printed wiring board of claim 9, wherein said upper layer of the two layer portion is a conductive material selected from the group consisting of Au, Cu, Ai, Pt and Ni.
Claim 18
Dependent Claim
37 words
A printed wiring board of claim 9, wherein the upper layer of said two layer portion comprises a layer of Au and a layer of a conductive material selected from the group consisting of Pd and Ni.
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