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US3017463A - Keyboard apparatus - Google Patents

Keyboard apparatus Download PDF

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Publication number
US3017463A
US3017463A US805489A US80548959A US3017463A US 3017463 A US3017463 A US 3017463A US 805489 A US805489 A US 805489A US 80548959 A US80548959 A US 80548959A US 3017463 A US3017463 A US 3017463A
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Prior art keywords
photo
signals
circuits
trigger
keys
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Expired - Lifetime
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US805489A
Inventor
Stanley H Dinsmore
Robert M Lee
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Bendix Corp
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Bendix Corp
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Priority to US805489A priority Critical patent/US3017463A/en
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Publication of US3017463A publication Critical patent/US3017463A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • 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
    • H03K17/968—Switches controlled by moving an element forming part of the switch using opto-electronic devices
    • H03K17/969—Switches controlled by moving an element forming part of the switch using opto-electronic devices having a plurality of control members, e.g. keyboard

Definitions

  • the present invention relates to a keyboard apparatus, in which keys are individually manually operated to form signals indicative of intelligence symbols.
  • An object of the present invention is to provide a simple, inexpensive keyboard apparatus which has a touch that is characteristic of a mechanical keyboard apparatus.
  • Another object of the present invention is to provide a keyboard apparatus wherein a plurality of switches as photo-sensitive switches are employed in conjunction with code patterns afiixed upon the keys of the apparatus whereby to form symbolic intelligence signals.
  • FIGURE 1 is a perspective view of a keyboard apparatus constructed in accordance with the present invention.
  • FIGURE 2 is a vertical sectional view along line 22 of FIGURE 1;
  • FIGURE 3 is a diagrammatic representation of the electrical system employed in the apparatus of FIGURE 1.
  • keys K forming a keyboard are shown to extend out of a cover C.
  • the keys K are individually depressed to cause the apparatus contained under the cover C to produce electrical signals indicative of a numeral, letter or other symbol with which a depressed key is associated.
  • the keys K may be arranged in accordance with standard patterns and may include a space key S and a shift key H.
  • Each of the keys K is affixed to a keybar 10 which includes an elongate horizontal member 12 integrally formed with a vertical member 14 upon which a key K is aflixed.
  • the left end of each of the elongate members 12 contains a slot 16, all of which receive elongate rod 18 that is transversely mounted at the rear of the cover C.
  • the keybars 16 are pivotally movable relative to the rod 18 and are urged upwardly by springs 20 aflixed between the bars and an elongate bracket 22.
  • the upward movement of the bars to is limited by a stop member 24 transversely mounted above the keybars l and ailixed to the cover C by screws 26.
  • the downward pivotal movement of the keybars it) is limited by an elongate stop 28 transversely afiixed in the cover C.
  • the limited downward movement of the keybars ll ⁇ performs a switching operation by elements of a code pattern 39 formed in the lower edge of each of the bars controlling separate switch means.
  • code patterns 30 are made up of extensions 32 which are integrally formed with the remainder of the keybar it), and which are different on each of the bars in accordance with the signals to be formed.
  • the extensions 32 are aligned with photo cells 34 which operate in conjunction with light sources as will be hereinafter explained.
  • the associated keybar 10 Upon depression of a key K the associated keybar 10 is pivotally moved downwardly (as illustrated by the keybar 10a) to place the extensions 32 in a position to obstruct the light which would normally illuminate the photo cells. In this manner, a switching operation is performed which results in the production of binary code signals indicative of a particular intelligence symbol.
  • the electrical system associated with the photo cells 34 is considered hereinafter.
  • the operation of the electrical system is commanded when the extension 32a interrupts the illumination of photo cell 341:. That is, the extension 32a is provided upon each of the keybars 10, and serves to indicate the depression of a key K. It is to be noted, that the extension 32a is shorter than the other extensions and is therefore last to interrupt the illumination of the photo cell associated therewith. This sequence is provided to assure that the extensions 32 are properly positioned prior to the time. when the electrical system is commanded to form a representative electrical signal.
  • a series of lights L1 through Ln are connected in a serial circuit which is adapted to be energized.
  • the number of lights L1 through Ln coincides to the number of photo Cells 34 and is dependent upon the capability of the apparatus. For example, if seven lights and associated photo cells are provided, signals may be formed which are representative of the letters of the alphabet, the numerals 0 through 9, and various other symbols.
  • Associated with each of the lights L1 through Ln is a photo cell circuit P1 through Pn.
  • the photo circuits P1 through Pu each include one of the photo cells 34 (FIGURE 2) and serve to provide a signal indicative of the light received from an associated one of the lights L1 through Ln.
  • the extensions 52 may be positioned to prevent the light from one of the lights L1 through Ln from striking an associated photo cell in one of the photo cell circuits Pl through Pn.
  • the photo cell circuits P1 through Pn may be variously constructed in accordance with well-known prior art. These circuits function to provide a signal which is inversely proportional in amplitude to the light received by the photo cell therein.
  • the output signals from each of the photo cell circuits Pl through Pn are applied respectively to trigger circuits T1 through Tn.
  • the trigger circuits may comprise various well-known systems as monastable multivibrators, or threshold-biased thyratron tubes, which function to provide a regular pulse upon receiving a signal which exceeds a predetermined amplitude.
  • the pulses from the trigger circuits T1 through Tn are all applied to a gating network 42 which has a plurality of output terminals 44.
  • the gating network 42 functions to pass the signals from all of the trigger circuits upon the occurrence of a pulse from the trig circuit Tn. Therefore, the gating network consists of a group of and or coincidence gates, is. one gate for each of the trigger circuits.
  • the gates each receive a signal from one of the trigger circuits T T and an other signal from the trigger circuit T type are well known in the prior art, and one illustrative form is shown and described in Patent 2,769,971 issued to C. I. Baske.
  • the photo cell P11 is associ- Gates of this ated with the extension 32a (FIGURE 2) and therefore the formation of a pulse by a trigger circuit Pn indicates the depression of one of the keys K. Furthermore, a pulse from the trigger circuit Tn indicates that the key K is fully depressed.
  • the pulse from the trigger circuit Tn in addition to being applied to the gating network 42, is also applied through a solenoid 50 to ground.
  • the solenoid 50 has a pivotally-mounted clapper 52 associated therewith which provides a mechanical striking sound upon energization of the solenoid 50. Therefore, it may be seen that upon the occurrence of a.pulse from the trigger circuit Tn, amechanical striking sound is produced by the solenoid 50 and the signals from each of the other trigger circuits are permitted to pass through the gating network 42 to the terminals 44.
  • the associated keybar Upon the depression of one of the keys K the associated keybar is pivotally moved downward about the rod 18 to position certain extensions 32 of the code pattern 30 so as to obstruct the light impinging upon certain of the photo cells 34.
  • the signals from the photo cell circuits P1 through Pn increase in amplitude to a level adequate to operate certain of the trigger circuits T1 through Tn thereby providing a high-state or pulse signal from these circuits.
  • the last of the trigger circuits to function in this manner is invariably trigger circuit Tn due to the short nature of the extension 32a.
  • the solenoid 50 is operated to pivotally move the clapper 52' and thereby provide a striking or clapping sound similar to that inherent in the operation of a typewriter.
  • the clapper 52 may comprise simply a metallic rod which has one end V apparatus.
  • afiixed to a support (as indicated in FIGURE 3) and carries a magnetic tip on the other end, so as to strike the armature of the solenoid 50 when the solenoid is energized.
  • the photo cells 34 Upon release of a depressed key K, the photo cells 34 are all illuminated thereby providing low signals from the photo cell circuits P1 through Pn to again cause the signals at the. terminals 44 to go to a low value and indicate no intelligence signal.
  • An apparatus for forming electrical code signals indicative of symbols associated with the keys of a manually-operated keyboard comprising: a plurality of bars having various code patterns afiixed thereto, said bars being controlled by said keys to be selectively placed in an operated position; a plurality of photo-electric devices for providing electrical signals and positioned to be variously operated by said code patterns when said bars are placed in an operated position; a gating network connected to receive a control signal from one of said photo electric devices, which one device is operative by each of said bars, said gating network being connected to receive signals from other of said photo-electric devices, said gating network functioning to pass code signals indicative of one of said symbols only upon depression of a key to place a bar in an operated position and upon receiving a control signal from said one photo-electric device; and an electrically-operated clapper means for providing a striking sound, said clapper means being connected to be operated by said control signal from said one of said photo-electric devices.
  • said clapper device comprises a solenoid coil unit connected to be energized by said one of said photo-electric devices and a rod mounted to strike said coil unit in a single stroke upon the energization thereof.

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  • Input From Keyboards Or The Like (AREA)

Description

1962 s. H. DINSMORE arm. 3,017,463
KEYBOARD APPARATUS Filed April 10, 1959 FIG.
GATIN G N ETWORK STAN LEY DI NSMORE OBERT LEE R INVENTORS.
CIRCUIT /T2 TRIGGER CIRCUIT I T3 TRIGGER I TRIGGER CIRCUIT PHOTO cm PHOTO CELL PHOTO CELL TRIGGER CIRCUIT FIG. 3
PHOTO CELL United States Patent ()fitice 3,017,463 Patented Jan. 16, 1932 3,tli7,463 KEYBOARD AIPARATUS Stanley H. Dinsrnore, Inglewood, and Robert M. Lee,
I .os Angeles, Calif., assignors to The Bendix Corporatron, a corporation of Delaware Filed Apr. 10, 1959, Ser. No. 865,489 3 Claims. (Cl. 17879) The present invention relates to a keyboard apparatus, in which keys are individually manually operated to form signals indicative of intelligence symbols.
In recent years, scientific developments have resulted in the continuously increasing use of automatic datahandling equipment. In the fabrication of data-handling equipment, a need arises for an apparatus to manually convert intelligence symbols into representative intelligence signals. Various types of keyboards have been proposed in the past to perform the conversion operation under manual control. However, a need remains for an inexpensive, simple, and accurate keyboard apparatus for converting intelligence symbols into equivalent intelligence signals. Furthermore, as keyboard operators are accustomed to the touch of mechanical keyboards, as those employed in typewriters, it is desirable to provide a keyboard which has a similar touch.
An object of the present invention is to provide a simple, inexpensive keyboard apparatus which has a touch that is characteristic of a mechanical keyboard apparatus.
Another object of the present invention is to provide a keyboard apparatus wherein a plurality of switches as photo-sensitive switches are employed in conjunction with code patterns afiixed upon the keys of the apparatus whereby to form symbolic intelligence signals.
These and other objects of the present invention will become apparent upon consideration of the following in conjunction with the drawing, in which:
FIGURE 1 is a perspective view of a keyboard apparatus constructed in accordance with the present invention;
FIGURE 2 is a vertical sectional view along line 22 of FIGURE 1; and
FIGURE 3 is a diagrammatic representation of the electrical system employed in the apparatus of FIGURE 1.
Referring initially to FIGURE 1, keys K forming a keyboard are shown to extend out of a cover C. In the normal operation of the keyboard, the keys K are individually depressed to cause the apparatus contained under the cover C to produce electrical signals indicative of a numeral, letter or other symbol with which a depressed key is associated. The keys K may be arranged in accordance with standard patterns and may include a space key S and a shift key H.
Considering the illustrative embodiment of the present invention in greater detail, reference will now be made to FIGURE 2. Each of the keys K is affixed to a keybar 10 which includes an elongate horizontal member 12 integrally formed with a vertical member 14 upon which a key K is aflixed. The left end of each of the elongate members 12 contains a slot 16, all of which receive elongate rod 18 that is transversely mounted at the rear of the cover C. The keybars 16 are pivotally movable relative to the rod 18 and are urged upwardly by springs 20 aflixed between the bars and an elongate bracket 22. The upward movement of the bars to is limited by a stop member 24 transversely mounted above the keybars l and ailixed to the cover C by screws 26.
The downward pivotal movement of the keybars it) is limited by an elongate stop 28 transversely afiixed in the cover C. The limited downward movement of the keybars ll} performs a switching operation by elements of a code pattern 39 formed in the lower edge of each of the bars controlling separate switch means. The
code patterns 30 are made up of extensions 32 which are integrally formed with the remainder of the keybar it), and which are different on each of the bars in accordance with the signals to be formed.
The extensions 32 are aligned with photo cells 34 which operate in conjunction with light sources as will be hereinafter explained. Upon depression of a key K the associated keybar 10 is pivotally moved downwardly (as illustrated by the keybar 10a) to place the extensions 32 in a position to obstruct the light which would normally illuminate the photo cells. In this manner, a switching operation is performed which results in the production of binary code signals indicative of a particular intelligence symbol.
The electrical system associated with the photo cells 34 is considered hereinafter. The operation of the electrical system is commanded when the extension 32a interrupts the illumination of photo cell 341:. That is, the extension 32a is provided upon each of the keybars 10, and serves to indicate the depression of a key K. It is to be noted, that the extension 32a is shorter than the other extensions and is therefore last to interrupt the illumination of the photo cell associated therewith. This sequence is provided to assure that the extensions 32 are properly positioned prior to the time. when the electrical system is commanded to form a representative electrical signal.
Reference will now be had to FIGURE 3 to consider the electrical system of the illustrative embodiment. A series of lights L1 through Ln are connected in a serial circuit which is adapted to be energized. The number of lights L1 through Ln coincides to the number of photo Cells 34 and is dependent upon the capability of the apparatus. For example, if seven lights and associated photo cells are provided, signals may be formed which are representative of the letters of the alphabet, the numerals 0 through 9, and various other symbols. Associated with each of the lights L1 through Ln is a photo cell circuit P1 through Pn. The photo circuits P1 through Pu each include one of the photo cells 34 (FIGURE 2) and serve to provide a signal indicative of the light received from an associated one of the lights L1 through Ln. Physically, the extensions 52 may be positioned to prevent the light from one of the lights L1 through Ln from striking an associated photo cell in one of the photo cell circuits Pl through Pn. The photo cell circuits P1 through Pn may be variously constructed in accordance with well-known prior art. These circuits function to provide a signal which is inversely proportional in amplitude to the light received by the photo cell therein.
The output signals from each of the photo cell circuits Pl through Pn are applied respectively to trigger circuits T1 through Tn. The trigger circuits may comprise various well-known systems as monastable multivibrators, or threshold-biased thyratron tubes, which function to provide a regular pulse upon receiving a signal which exceeds a predetermined amplitude.
The pulses from the trigger circuits T1 through Tn are all applied to a gating network 42 which has a plurality of output terminals 44. The gating network 42 functions to pass the signals from all of the trigger circuits upon the occurrence of a pulse from the trig circuit Tn. Therefore, the gating network consists of a group of and or coincidence gates, is. one gate for each of the trigger circuits. Thus, the gates each receive a signal from one of the trigger circuits T T and an other signal from the trigger circuit T type are well known in the prior art, and one illustrative form is shown and described in Patent 2,769,971 issued to C. I. Baske.
Returning to FIGURE 3, the photo cell P11 is associ- Gates of this ated with the extension 32a (FIGURE 2) and therefore the formation of a pulse by a trigger circuit Pn indicates the depression of one of the keys K. Furthermore, a pulse from the trigger circuit Tn indicates that the key K is fully depressed.
The pulse from the trigger circuit Tn, in addition to being applied to the gating network 42, is also applied through a solenoid 50 to ground. The solenoid 50 has a pivotally-mounted clapper 52 associated therewith which provides a mechanical striking sound upon energization of the solenoid 50. Therefore, it may be seen that upon the occurrence of a.pulse from the trigger circuit Tn, amechanical striking sound is produced by the solenoid 50 and the signals from each of the other trigger circuits are permitted to pass through the gating network 42 to the terminals 44.
Considering the operation of the illustrative embodiment of the present invention, normally all of the keys K will be held in an elevated position by the springs 20 so that each of the photo cells 34 is illuminated. As a result, the photo cell circuits P1 through Pn producev a low amplitude signal which is inadequate to operate any of the trigger circuits T1 through Tn. As none of the trigger circuits are operated, no pulses appear at the output terminals 44. Of course, in accordance with conventional binary signal techniques, the existence of the low value for each of a plurality of two-state signals is indicative of no signal. That is, the illustrative embodiment of the present invention employs binary signal representation which comprises a plurality of two-state signals. A low value for all of these signals, appearing at the terminals 44 indicates that no signals representative of an intelligence symbol are being formed.
Upon the depression of one of the keys K the associated keybar is pivotally moved downward about the rod 18 to position certain extensions 32 of the code pattern 30 so as to obstruct the light impinging upon certain of the photo cells 34. As the light striking the photo cells is obstructed, the signals from the photo cell circuits P1 through Pn increase in amplitude to a level adequate to operate certain of the trigger circuits T1 through Tn thereby providing a high-state or pulse signal from these circuits. The last of the trigger circuits to function in this manner is invariably trigger circuit Tn due to the short nature of the extension 32a. Upon the occurrence of a pulse from the trigger circuit Tn the signals from the other trigger circuits are applied through the gating network 42 to the output terminals 44 providing a binary code signal indicative of the symbol associated with the depressed key. Simultaneously with the appearance of the binary signals at the terminals 44, the solenoid 50 is operated to pivotally move the clapper 52' and thereby provide a striking or clapping sound similar to that inherent in the operation of a typewriter. The clapper 52 may comprise simply a metallic rod which has one end V apparatus.
afiixed to a support (as indicated in FIGURE 3) and carries a magnetic tip on the other end, so as to strike the armature of the solenoid 50 when the solenoid is energized.
Upon release of a depressed key K, the photo cells 34 are all illuminated thereby providing low signals from the photo cell circuits P1 through Pn to again cause the signals at the. terminals 44 to go to a low value and indicate no intelligence signal.
An important feature of the present invention resides in the simplicity of a system constructed in accordance therewith, resulting in an inexpensive but reliable It will be readily apparent from a consideration above that various forms of apparatus incorporating the present invention are possible. Therefore, the scope of the invention is to be limited only by the following claims.
We claim: I
1. An apparatus for forming electrical code signals indicative of symbols associated with the keys of a manually-operated keyboard, comprising: a plurality of bars having various code patterns afiixed thereto, said bars being controlled by said keys to be selectively placed in an operated position; a plurality of photo-electric devices for providing electrical signals and positioned to be variously operated by said code patterns when said bars are placed in an operated position; a gating network connected to receive a control signal from one of said photo electric devices, which one device is operative by each of said bars, said gating network being connected to receive signals from other of said photo-electric devices, said gating network functioning to pass code signals indicative of one of said symbols only upon depression of a key to place a bar in an operated position and upon receiving a control signal from said one photo-electric device; and an electrically-operated clapper means for providing a striking sound, said clapper means being connected to be operated by said control signal from said one of said photo-electric devices.
2. Apparatus according to claim 1 wherein said clapper device comprises a solenoid coil unit connected to be energized by said one of said photo-electric devices and a rod mounted to strike said coil unit in a single stroke upon the energization thereof.
3. Apparatus according to claim 1 wherein said plurality of bars comprise elongate pivotally-mounted metal strips afiixed to said keys and having a section including variously-arranged extensions to comprise code patterns,
References Cited in the fileof this patent UNITED STATES PATENTS
US805489A 1959-04-10 1959-04-10 Keyboard apparatus Expired - Lifetime US3017463A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3104388A (en) * 1962-03-28 1963-09-17 Rabinow Engineering Co Inc Keyboard signal generator
US3119996A (en) * 1960-10-27 1964-01-28 Potter Instrument Co Inc Code generator with non-contacting coupling to character keys
US3233715A (en) * 1964-04-20 1966-02-08 Invac Corp Transmitter receiver machine employing print sphere typewriter structure
US3253087A (en) * 1961-05-02 1966-05-24 Purdy & Mcintosh Electronic De Electrical signal code generating equipment
US3283873A (en) * 1965-05-07 1966-11-08 Sperry Rand Corp Electronic shift and shift lock device
US3288261A (en) * 1965-09-01 1966-11-29 Sperry Rand Corp Electronic case shift means
US3369643A (en) * 1966-03-24 1968-02-20 Avgerinos Encoding keyboard
US3372789A (en) * 1966-01-29 1968-03-12 Zeiss Ikon Ag Keyboard with immobile touch switches
US3519116A (en) * 1968-05-16 1970-07-07 Imagination Designs Eng & Sale Optical keyboard control means with series and parallel light circuits
US3598971A (en) * 1968-09-03 1971-08-10 Ricoh Kk Device for introducing values into a calculating machine, having a reduced keyboard
US3603982A (en) * 1969-05-02 1971-09-07 Ncr Co Data entry means
US3614315A (en) * 1968-08-26 1971-10-19 Teletype Corp Character repeat circuit
US3617627A (en) * 1968-05-03 1971-11-02 Teletype Corp Code converter suitable for use with a keyboard
US3668694A (en) * 1970-07-24 1972-06-06 Haydn V Purdy Electrical contact-making keyboards
US3668407A (en) * 1970-05-28 1972-06-06 Texas Instruments Inc Optical switching for keyboard encoder
US3743817A (en) * 1970-11-12 1973-07-03 Audac Corp Data card terminal
US3750150A (en) * 1971-08-06 1973-07-31 Int Standard Electric Corp Photoelectric keyboard for data input devices or the like
US3783274A (en) * 1972-04-06 1974-01-01 H Towne Solid-state switch
US3847262A (en) * 1969-03-14 1974-11-12 Datacq Syst Corp Apparatus and attachment for deriving coded signals
US4159183A (en) * 1976-11-02 1979-06-26 Olympia Werke Ag Keyboard employing photoelectric key actuation sensing
US4303856A (en) * 1977-05-25 1981-12-01 Serras Paulet Edouard Control push-button device for switching an electronic or electric circuit
USRE32419E (en) * 1981-03-16 1987-05-12 Engineering Research Applications, Inc. Molded keyboard and method of fabricating same
US6031469A (en) * 1996-11-12 2000-02-29 Dodd; Jerry Ergonomic computer keyboard

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1283320A (en) * 1914-06-02 1918-10-29 Ferdinand S Ruttmann Telegraphic sending-machine.
US2408754A (en) * 1944-07-27 1946-10-08 Teleregister Corp Photoelectric transmitting typewriter apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1283320A (en) * 1914-06-02 1918-10-29 Ferdinand S Ruttmann Telegraphic sending-machine.
US2408754A (en) * 1944-07-27 1946-10-08 Teleregister Corp Photoelectric transmitting typewriter apparatus

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119996A (en) * 1960-10-27 1964-01-28 Potter Instrument Co Inc Code generator with non-contacting coupling to character keys
US3253087A (en) * 1961-05-02 1966-05-24 Purdy & Mcintosh Electronic De Electrical signal code generating equipment
US3104388A (en) * 1962-03-28 1963-09-17 Rabinow Engineering Co Inc Keyboard signal generator
US3233715A (en) * 1964-04-20 1966-02-08 Invac Corp Transmitter receiver machine employing print sphere typewriter structure
US3283873A (en) * 1965-05-07 1966-11-08 Sperry Rand Corp Electronic shift and shift lock device
US3288261A (en) * 1965-09-01 1966-11-29 Sperry Rand Corp Electronic case shift means
US3372789A (en) * 1966-01-29 1968-03-12 Zeiss Ikon Ag Keyboard with immobile touch switches
US3369643A (en) * 1966-03-24 1968-02-20 Avgerinos Encoding keyboard
US3617627A (en) * 1968-05-03 1971-11-02 Teletype Corp Code converter suitable for use with a keyboard
US3519116A (en) * 1968-05-16 1970-07-07 Imagination Designs Eng & Sale Optical keyboard control means with series and parallel light circuits
US3614315A (en) * 1968-08-26 1971-10-19 Teletype Corp Character repeat circuit
US3598971A (en) * 1968-09-03 1971-08-10 Ricoh Kk Device for introducing values into a calculating machine, having a reduced keyboard
US3847262A (en) * 1969-03-14 1974-11-12 Datacq Syst Corp Apparatus and attachment for deriving coded signals
US3603982A (en) * 1969-05-02 1971-09-07 Ncr Co Data entry means
US3668407A (en) * 1970-05-28 1972-06-06 Texas Instruments Inc Optical switching for keyboard encoder
US3668694A (en) * 1970-07-24 1972-06-06 Haydn V Purdy Electrical contact-making keyboards
US3743817A (en) * 1970-11-12 1973-07-03 Audac Corp Data card terminal
US3750150A (en) * 1971-08-06 1973-07-31 Int Standard Electric Corp Photoelectric keyboard for data input devices or the like
US3783274A (en) * 1972-04-06 1974-01-01 H Towne Solid-state switch
US4159183A (en) * 1976-11-02 1979-06-26 Olympia Werke Ag Keyboard employing photoelectric key actuation sensing
US4303856A (en) * 1977-05-25 1981-12-01 Serras Paulet Edouard Control push-button device for switching an electronic or electric circuit
USRE32419E (en) * 1981-03-16 1987-05-12 Engineering Research Applications, Inc. Molded keyboard and method of fabricating same
US6031469A (en) * 1996-11-12 2000-02-29 Dodd; Jerry Ergonomic computer keyboard

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