JPS55108033A - Keyboard unit - Google Patents

Keyboard unit

Info

Publication number
JPS55108033A
JPS55108033A JP1438779A JP1438779A JPS55108033A JP S55108033 A JPS55108033 A JP S55108033A JP 1438779 A JP1438779 A JP 1438779A JP 1438779 A JP1438779 A JP 1438779A JP S55108033 A JPS55108033 A JP S55108033A
Authority
JP
Japan
Prior art keywords
output
electrodes
tracks
signal
b1wb3
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.)
Pending
Application number
JP1438779A
Other languages
Japanese (ja)
Inventor
Kentaro Hanma
Takeshi Hazama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP1438779A priority Critical patent/JPS55108033A/en
Publication of JPS55108033A publication Critical patent/JPS55108033A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To reduce the cost and to prevent malfunction, by making different the length of the surface wave propagation path between the input and output electrodes corresponding to each other and of a plurality and connecting the output to common discriminator.
CONSTITUTION: The high frequency signal produced at the AC signal source 1 is inputted to the input electrodes 221W224 of the elastic surface wave element 2 being the pulsive high frequency signal at the gate circuit 13 and converted into elastic surface waves and reaches the output electrodes 231W236 through the propagation of tracks A1WA3 and B1WB3. When the length of tracks A1WA3 and B1WB3 is made different, the output signal appeared at the electrodes 231W233, and 234W236 is the signal different in the delay time respectively. Accordingly, when a finger is touched on, e.g., C11 among the crossing area of each track C11WC13, C21W C23, and C33WC36, the absence of output signal from the electrodes C231 and C234 is discriminated with the discriminators 6, 6A. The discriminator 8 inputs the output of the units 6, 6A to determine which area among the crossing areas of A and B tracks is depressed.
COPYRIGHT: (C)1980,JPO&Japio
JP1438779A 1979-02-13 1979-02-13 Keyboard unit Pending JPS55108033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1438779A JPS55108033A (en) 1979-02-13 1979-02-13 Keyboard unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1438779A JPS55108033A (en) 1979-02-13 1979-02-13 Keyboard unit

Publications (1)

Publication Number Publication Date
JPS55108033A true JPS55108033A (en) 1980-08-19

Family

ID=11859639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1438779A Pending JPS55108033A (en) 1979-02-13 1979-02-13 Keyboard unit

Country Status (1)

Country Link
JP (1) JPS55108033A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001090874A1 (en) * 2000-05-22 2001-11-29 Fujitsu Limited Touch panel device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001090874A1 (en) * 2000-05-22 2001-11-29 Fujitsu Limited Touch panel device
US7324096B2 (en) 2000-05-22 2008-01-29 Fujitsu Limited Touch panel device
US7705836B2 (en) 2000-05-22 2010-04-27 Fujitsu Limited Touch panel device

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