GB1410811A - Keyboard apparatus - Google Patents
Keyboard apparatusInfo
- Publication number
- GB1410811A GB1410811A GB5250572A GB5250572A GB1410811A GB 1410811 A GB1410811 A GB 1410811A GB 5250572 A GB5250572 A GB 5250572A GB 5250572 A GB5250572 A GB 5250572A GB 1410811 A GB1410811 A GB 1410811A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- key
- stable
- keys
- array
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
- H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/003—Phantom keys detection and prevention
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input From Keyboards Or The Like (AREA)
- Electronic Switches (AREA)
Abstract
1410811 Keyboards PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 14 Nov 1972 [17 Nov 1971] 52505/72 Heading G4H Keyboard apparatus comprises an array of keys and an individual bi-stable element associated with each, and an interrogation unit which repetitively and successively interrogates the keys to produce an output corresponding to each key after actuation thereof and set the corresponding bi-stable to block further output from the key, and reset the bi-stable when the key has been de-actuated. In Fig. 1, a counter T driven by a clock Cl interrogates in turn the columns of the matrix of keys K11 &c. shown. If, for example, K11 is depressed, interrogation of its column produces an output from AND A11, via AND N11 enabled by the reset state of bi-stable FF11, to output B11, this output being fed back to set bi-stable F11, preventing further output at B11 until the column is interrogated at a time when the key K11 is not depressed. When this happens the absence of an output from AND A11 enables AND G11 via inverter I11 to reset bi-stable FF11. The output at B11 &c. can be encoded into serial or parallel binary form. The row conductors R1, R2, R3 are redundant unless the array of key switches is separate from the rest of the circuit, the latter being provided in integrated circuit form connected to the key array only by the row and column conductors. The diodes D11 &c. can be dispensed with if the attenuation at a closed key switch prevents incorrect enabling of an AND such as All when two switches are closed together.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NLAANVRAGE7115804,A NL170895C (en) | 1971-11-17 | 1971-11-17 | KEYBOARD WITH CYCLIC QUESTIONER. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1410811A true GB1410811A (en) | 1975-10-22 |
Family
ID=19814496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5250572A Expired GB1410811A (en) | 1971-11-17 | 1972-11-14 | Keyboard apparatus |
Country Status (10)
Country | Link |
---|---|
US (1) | US3778818A (en) |
JP (1) | JPS538455B2 (en) |
BE (1) | BE791475A (en) |
CA (1) | CA973805A (en) |
DE (1) | DE2255372C3 (en) |
FR (1) | FR2161660A5 (en) |
GB (1) | GB1410811A (en) |
IT (1) | IT973544B (en) |
NL (1) | NL170895C (en) |
SE (1) | SE385986B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4500169A (en) * | 1982-07-13 | 1985-02-19 | Donnelly John H | Cosmetic and observer line of sight mirror |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4096935A (en) * | 1974-02-22 | 1978-06-27 | Canon Kabushiki Kaisha | Input device |
JPS5535679U (en) * | 1978-08-31 | 1980-03-07 | ||
FR2447089A1 (en) * | 1979-01-17 | 1980-08-14 | Serras Paulet Edouard | KEY CONTROL KEYBOARD AND MECHANICAL SWITCHES |
FR2449388A1 (en) * | 1979-02-13 | 1980-09-12 | Cii Honeywell Bull | Entry system for coded data into data processing system - employs electronic keyboard containing memory and coding cells, which are clocked by pulse generator |
EP0095023A3 (en) * | 1982-05-20 | 1985-04-10 | International Business Machines Corporation | Contact keyboard with finger controlled n-key rollover |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5035372B1 (en) * | 1970-03-26 | 1975-11-15 |
-
0
- BE BE791475D patent/BE791475A/en not_active IP Right Cessation
-
1971
- 1971-11-17 NL NLAANVRAGE7115804,A patent/NL170895C/en not_active IP Right Cessation
-
1972
- 1972-11-07 US US00304388A patent/US3778818A/en not_active Expired - Lifetime
- 1972-11-11 DE DE2255372A patent/DE2255372C3/en not_active Expired
- 1972-11-14 JP JP11359072A patent/JPS538455B2/ja not_active Expired
- 1972-11-14 GB GB5250572A patent/GB1410811A/en not_active Expired
- 1972-11-14 SE SE7214763A patent/SE385986B/en unknown
- 1972-11-14 IT IT54014/72A patent/IT973544B/en active
- 1972-11-15 CA CA156,456A patent/CA973805A/en not_active Expired
- 1972-11-16 FR FR7240705A patent/FR2161660A5/fr not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4500169A (en) * | 1982-07-13 | 1985-02-19 | Donnelly John H | Cosmetic and observer line of sight mirror |
Also Published As
Publication number | Publication date |
---|---|
JPS4858922A (en) | 1973-08-18 |
NL170895C (en) | 1983-01-03 |
DE2255372B2 (en) | 1977-10-13 |
DE2255372A1 (en) | 1973-05-24 |
SE385986B (en) | 1976-07-26 |
DE2255372C3 (en) | 1978-06-08 |
BE791475A (en) | 1973-05-16 |
NL170895B (en) | 1982-08-02 |
IT973544B (en) | 1974-06-10 |
US3778818A (en) | 1973-12-11 |
CA973805A (en) | 1975-09-02 |
NL7115804A (en) | 1973-05-21 |
JPS538455B2 (en) | 1978-03-29 |
FR2161660A5 (en) | 1973-07-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |