JPS4864838A - - Google Patents
Info
- Publication number
- JPS4864838A JPS4864838A JP47099975A JP9997572A JPS4864838A JP S4864838 A JPS4864838 A JP S4864838A JP 47099975 A JP47099975 A JP 47099975A JP 9997572 A JP9997572 A JP 9997572A JP S4864838 A JPS4864838 A JP S4864838A
- Authority
- JP
- Japan
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C17/00—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards
- G11C17/04—Read-only memories programmable only once; Semi-permanent stores, e.g. manually-replaceable information cards using capacitive elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
- H03K17/98—Switches controlled by moving an element forming part of the switch using a capacitive movable element having a plurality of control members, e.g. keyboard
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20339071A | 1971-11-30 | 1971-11-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS4864838A true JPS4864838A (en) | 1973-09-07 |
| JPS5437457B2 JPS5437457B2 (en) | 1979-11-15 |
Family
ID=22753791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9997572A Expired JPS5437457B2 (en) | 1971-11-30 | 1972-10-06 |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5437457B2 (en) |
| DE (1) | DE2247972A1 (en) |
| FR (1) | FR2161969B1 (en) |
| GB (1) | GB1363778A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51131127U (en) * | 1975-04-08 | 1976-10-22 | ||
| US4772874A (en) * | 1984-02-29 | 1988-09-20 | Topre Corporation | Keyboard apparatus |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2168816A (en) * | 1984-12-19 | 1986-06-25 | Philips Electronic Associated | Touch-sensitive position sensor apparatus |
| US4651133A (en) * | 1984-12-24 | 1987-03-17 | At&T Technologies, Inc. | Method and apparatus for capacitive keyboard scanning |
| US5499208A (en) * | 1994-09-12 | 1996-03-12 | At&T Corp. | Integrated circuit memory device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293640A (en) * | 1964-05-22 | 1966-12-20 | Chalfin Albert | Electronic systems keyboard and switch matrix |
| US3437795A (en) * | 1965-06-28 | 1969-04-08 | Ampex | Data input devices and systems |
| DE1549570A1 (en) * | 1967-04-03 | 1971-03-04 | Elektronische Rechenmasch Ind | Circuit for a contactless keyboard, preferably for electronic calculating machines |
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1972
- 1972-09-29 DE DE19722247972 patent/DE2247972A1/en active Pending
- 1972-10-06 JP JP9997572A patent/JPS5437457B2/ja not_active Expired
- 1972-10-09 GB GB4646672A patent/GB1363778A/en not_active Expired
- 1972-11-08 FR FR7240418A patent/FR2161969B1/fr not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51131127U (en) * | 1975-04-08 | 1976-10-22 | ||
| JPS5611144Y2 (en) * | 1975-04-08 | 1981-03-13 | ||
| US4772874A (en) * | 1984-02-29 | 1988-09-20 | Topre Corporation | Keyboard apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1363778A (en) | 1974-08-14 |
| FR2161969A1 (en) | 1973-07-13 |
| JPS5437457B2 (en) | 1979-11-15 |
| FR2161969B1 (en) | 1975-03-28 |
| DE2247972A1 (en) | 1973-06-07 |