JPS6472599A - Telephone set structure - Google Patents

Telephone set structure

Info

Publication number
JPS6472599A
JPS6472599A JP22815387A JP22815387A JPS6472599A JP S6472599 A JPS6472599 A JP S6472599A JP 22815387 A JP22815387 A JP 22815387A JP 22815387 A JP22815387 A JP 22815387A JP S6472599 A JPS6472599 A JP S6472599A
Authority
JP
Japan
Prior art keywords
layer
substrate
circuit pattern
carbon film
telephone set
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP22815387A
Other languages
Japanese (ja)
Other versions
JPH0156560B2 (en
Inventor
Takayuki Kitai
Kunioki Oyagi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP22815387A priority Critical patent/JPS6472599A/en
Publication of JPS6472599A publication Critical patent/JPS6472599A/en
Publication of JPH0156560B2 publication Critical patent/JPH0156560B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane

Abstract

PURPOSE:To reduce a speaker noise due to the induction of a digital signal by forming at least a part of an analog signal conductor for handling a small current in an analog circuit pattern on the surface of a keyboard substrate, covering the surface of the conductor with a photoresist layer, and covering the surface of the layer with a carbon film. CONSTITUTION:In a telephone set having a main board substrate 1A formed with a logic circuit pattern 3 and an analog circuit pattern 4 on its surface, and a keyboard substrate 5A formed with a key contact layer 6A, at least part of analog signal conductors 4a, 4a' for handling a small current in the pattern 4 is formed on the surface of the substrate 5A. The surfaces of the conductors 4a, 4a' are covered with a photoresist layer 14, and the surface of the layer 14 is covered with a carbon film 13. For example, the film 13 is formed by coating the surface of the layer 14 partly with an undercoating layer 15 in the same process of forming the key contact layer 6A formed of the carbon film.
JP22815387A 1987-09-11 1987-09-11 Telephone set structure Granted JPS6472599A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22815387A JPS6472599A (en) 1987-09-11 1987-09-11 Telephone set structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22815387A JPS6472599A (en) 1987-09-11 1987-09-11 Telephone set structure

Publications (2)

Publication Number Publication Date
JPS6472599A true JPS6472599A (en) 1989-03-17
JPH0156560B2 JPH0156560B2 (en) 1989-11-30

Family

ID=16872055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22815387A Granted JPS6472599A (en) 1987-09-11 1987-09-11 Telephone set structure

Country Status (1)

Country Link
JP (1) JPS6472599A (en)

Also Published As

Publication number Publication date
JPH0156560B2 (en) 1989-11-30

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