US3735395A - Projection type keyboard device - Google Patents

Projection type keyboard device Download PDF

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Publication number
US3735395A
US3735395A US3735395DA US3735395A US 3735395 A US3735395 A US 3735395A US 3735395D A US3735395D A US 3735395DA US 3735395 A US3735395 A US 3735395A
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United States
Prior art keywords
light
keyboard
pen
light pen
screen
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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 - Lifetime
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Y Iwabuchi
T Yoshioka
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Iwatsu Electric Co Ltd
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Iwatsu Electric Co Ltd
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Priority to US10368071A priority Critical
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Publication of US3735395A publication Critical patent/US3735395A/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0386Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965Switches controlled by moving an element forming part of the switch
    • H03K17/968Switches controlled by moving an element forming part of the switch using opto-electronic devices
    • H03K17/969Switches controlled by moving an element forming part of the switch using opto-electronic devices having a plurality of control members, e.g. keyboard
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/26Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys using opto-electronic means

Abstract

In a projection type keyboard device of the type wherein desired information is selected by means of a light pen on a keyboard upon which the information of the desired letter, digit, symbol and the like are selectively projected, the light for projecting the desired information and the light of the light pen are prevented from occuring simultaneously.

Description

United States Patent 1191 1111 3,735,35
lwabuchi et al. 1 May 22, 1973 s41 PROJECTION TYPE KEYBOARD 2,924,321 2/1960 Ziskind et a1 ..250/220 M x EVIC 3,292,489 12/1966 Johnson et a]. ..340/324 R X r 32.2.". ,v 3,360,657 12/1967 [75] Inventors: Yasuo lwabuchi; Tomonori Yoshio- 3,443,332 5/1969 ka, both of Tokyo, Japan 1 3,495,232 2/1970 3,613,066 10/1971 Cooreman .178/l8 X [73] Assignee: Iwatsu Electric Company, Limited,
Tokyo, Japan Primary Examiner-David L. Trafton [22] Filed Jan 4 1971 Attorney--Chittick, Pfund, Birch, Samuels & Gauthier 21 Appl. No.2 103,680
57 ABSTRACT 52 us. (31......340/365 P, 250/219 FR, 250/220 M,
340/166 EL, 340/324 M, 340/337, 340/378 a P type devce the type B wherein desired mformatlon 1s selected by means of a light pen on a keyboard upon which the information g? of the desired letter, digit, symbol and the like are selectively projected, the light for projecting the 250/219 220 208; 340/324 desired information and the light of the light pen are 166 365 378 B; 178/18 prevented from occuring simultaneously.
[56] References Cited 4 Claims, 4 Drawing Figures UNITED STATES PATENTS 3,534,359 10/1970 Harris ..340/324 R PATENTEW 3.735.395
SHEET 1 UF 2 H BINARY BOIINIEH [IF Y may bo umn 3 L L f s 1 2 um REGISTER INVENTORS YASUO I WABUCH I TOMONORI YOS H IOKA ATTORNEY S PROJECTION TYPE KEYBOARD DEVICE BACKGROUND OF THE INVENTION This invention relates to a keyboard device capable of correctly selecting letters, digits or symbols which are to be projected on a screen by means of a light pen.
' The number of letters, digits, numerals, and symbols selected by such a keyboard amounts to from about 50 to 200 whereas, there are 1,000 to 2,000 in a Japanese typewriter. In either case a shift key is used or a plurality of instructions are provided for the key. In the case of a chinese character typewriter it is necessary to depress a combination of keys. This requires a troublesome operation and often causes miss-operation of the shift key.
SUMMARY OF THE INVENTION It is an object of this invention to provide an improved projection type keyboard device which can prevent objectional interference between the light for projecting the image and the light of the light pen.
In accordance with the invention, in a projection type keyboard device of the type wherein desired information is selected by means of a light pen on a keyboard upon which the formation of the desired letter, digit, symbol and the like are selectively projected, the light for projecting the desired information and the light of the light pen are prevented from occuring simultaneously.
BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawing FIG. 1 shows an exploded perspective view of various elements to explain the principle of this invention FIG. 2 shows a connection diagram of one example of the encoder utilized in this invention and FIGS. 3A and 3B show time charts helpful to explain the operation of the encoder shown in FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT- With reference first to FIG. 1 of the accompanying drawing there is shown a keyboard I mounted on an operators table, not shown. Images of letters, digits, symbols, etc. recorded on a micro-film 2 are projected on a translucent screen, not shown, arranged in front of the keyboard by means of a light source 3 and a projection lens 4. When the selected letters and the like arenot projected on the screen, the micro-fihn 2 is advanced by a sprocket wheel 5 or an equivalent mechanism. To selectively display a desired letter on' the screen a light pen 6 is brought to the selected letter and then a switch is closed to pass current through a luminescent body 8 from an electric source 9 to cause it to luminesce. The light emanated in this manner is collected by a'condenser lens 10 and is then projected upon a photosensitive element 11 comprising a plurality of X signal conductors 12, a plurality of Y-signal conductors 13 which are arranged in a matrix and a plurality of photoelectric transducer elements 14 such as photodiodes disposed at respective crossings be tween conductors l2 and 13. Each photoelectric transducer element 14 corresponds to one of the letters to be projected on the screen. Accordingly, the light emitted from the light pen 6 impinges upon a photoelectric transducer element 14 corresponding to the position of the selected letter to activate the particular element. As
a consequence, when the activated photosensitive element is detected the desired keying operation will be made. However, when the projection of the selected letter and the detection thereof is made by light, the light used for the projection and the light emitted by the light pen interfere with each other thus disturbing accurate keying operations.
According to this invention, the source of projection light 3 is lighted at a definite interval under the control of a control source 15 and the light of the light pen 6 is projected upon the photosensitive element 11 during the quiescent periods of the source 3 thus assuring ready and accurate selection of the letters.
The encoder for the selected photoelectric transducer element 14 comprises X and Y-binary counters CX and CY, and matrix circuits MX and MY associated with binary counters CX and CY, respectively. The output terminals of matrix circuit MX are connected to X-signal conductors 12 of the photosensitive element 11 whereas output terminals of matrix circuit CY are connected to Y-signal conductors 13 of the photosensitive element 11' through gate circuits G through G connected to perform theoretical multiplying operations. In this example, the number of rows X and the number of columns Y are both four.
When a letter at an address (x y is selected, the light from the light pen 6 is projected on the portion of the screen corresponding to the position of the photosensitive element 11 bounded by a dotted line circle as shown in FIG. 2, so that a photoelectric transducer element at this portion becomes conductive. In the case when both X and Y represent a binary l a gate circuit G produces an output. This output ceases the generation of the clock pulse CP. The content 3 of X counter CX and the content 3 of Y-counter CY are utilized to encode the selected letter and the encoded letter is stored in a data register, not shown, through gate circuits G and G In FIG. 2 symbol S represents signals showing the number of pages of microfilm 2 and S, the closing signal for switch 7 of the light pen 6.
FIG. 3A shows the relationship among the operation (shown by S of the light source 3, the operation (shown by S of switch 7 of light pen 6 and the letter selecting operation (shown by CR) when light is emitted from the light pen in response to its switch. The reading of the position of the letter is performed at an instant shown by a pulse bounded by a dotted line circle. FIG. 3B shows the relation among operations of various elements shown in FIG. 2.
In the embodiment described above, although the projection of the image and the lighting of the light pen are alternately at a definite period it is to be noted that the circuit may be modified so that only when the switch of the light pen is depressed, the projectionof the image is ceased.
As above described in accordance with this invention the projection of the position of letters, symbols and the like on the keyboard for the purpose of informing the position to the operator and the lighting of the light pen are made alternately. When the light pen is lighted to select a photoelectric transducer element located at the desired position among a group of such elements, the light source for image projection is extinguished so that its light cannot interfere with light from the light pen and the S/N ratio is improved, thus assuring accu rate selection.
Accordingly, when used in combination with a pattern or letter display device utilizing a CRT the novel keyboard device is extremely advantageous for typesetting, editing and searching involving a number of letters.
While a particular embodiment of the invention has been shown and described, it will occur to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
We claim:
1. In a projection type keyboard device of the type wherein desired information is selected by directing light from a light pen onto a keyboard upon which a plurality of characters are selectively projected by light from the back of said keyboard, the improvement which comprises means for preventing the light for projecting the desired characters and the light of the light pen from occurring simultaneously.
2. A method of operating a projection type keyboard device wherein a plurality of characters located in back of a screen are projected toward the screen by a light source and light from a light pen in front of the screen is selectively directed onto a selected projected character on the screen and onto a photosensitive element to input the selected character, said method further comprising the step of preventing light from said source from occurring simultaneously with light from said light pen.
3. The method as recited in claim 2 wherein light from said source occurs alternately with light from said light pen.
4. The method as recited in claim 2 wherein light from said source does not occur whenever said light pen is being operated.
(I ER'II I GATE 0 F C (l h R, EC? i ON Patent No. 5, 95 Dated May 22, 1973 Yasuo Iwabuchi and Tomonori Yoshioka lnvcntor(::) v
It is ccrti find that error appears in the abovc-idcntificd patent and that said Letters Patent are hereby corrected as shown below:
Column 1, line 9, "there are 1000" should read there are from 1000 Column 1, line 25, change "formation" to information Column 2, line 53, "are alternately" should be are performed alternately Column 3, after line 10, insert the following paragraph In the appended claims, the term "character" is used to denote letters, digits, symbols and the like.
Signed and sealed this 18th day of December 1973.
(SEAL) r Attest:
EDWARD M.FLET CHER,JR. RENE D. TEGTMEYER Attesting Officer Acting Commissioner of Patents

Claims (4)

1. In a projection type keyboard device of the type wherein desired information is selected by directing light from a light pen onto a keyboard upon which a plurality of characters are selectively projected by light from the back of said keyboard, the improvement which comprises means for preventing the light for projecting the desired characters and the light of the light pen from occurring simultaneously.
2. A method of operating a projection type keyboard device wherein a plurality of characters located in back of a screen are projected toward the screen by a light source and light from a light pen in front of the screen is selectively directed onto a selected projected character on the screen and onto a photosensitive element to input the selected character, said method further comprising the step of preventing light from said source from occurring simultaneously with light from said light pen.
3. The method as recited in claim 2 wherein light from said source occurs alternately with light from said light pen.
4. The method as recited in claim 2 wherein light from said source does not occur whenever said light pen is being operated.
US3735395D 1971-01-04 1971-01-04 Projection type keyboard device Expired - Lifetime US3735395A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956745A (en) * 1971-12-16 1976-05-11 The Marconi Company Limited Programmable keyboard arrangements
US4086588A (en) * 1972-06-02 1978-04-25 Canon Kabushiki Kaisha Signal generator
US4209255A (en) * 1979-03-30 1980-06-24 United Technologies Corporation Single source aiming point locator
US4431870A (en) * 1982-02-25 1984-02-14 May George A Telephone system with computer generated dial pad and automatic dialing
US4485373A (en) * 1979-12-13 1984-11-27 I. E. I (Australia) Proprietary Limited Automatic security monitoring system
US4713535A (en) * 1985-09-04 1987-12-15 Rhoades Randy L Optical keyboard
WO1994015315A1 (en) * 1992-12-23 1994-07-07 Bernhard Weixler System for optional control of functions of a pc
US6097373A (en) * 1997-10-28 2000-08-01 Invotek Corporation Laser actuated keyboard system
US6377238B1 (en) * 1993-04-28 2002-04-23 Mcpheters Robert Douglas Holographic control arrangement
US20140132503A1 (en) * 2012-11-09 2014-05-15 Ross Conrad Labelson Optical Control of Display Screens
US9689967B1 (en) 2016-04-07 2017-06-27 Uhnder, Inc. Adaptive transmission and interference cancellation for MIMO radar
US9753132B1 (en) 2016-04-25 2017-09-05 Uhnder, Inc. On-demand multi-scan micro doppler for vehicle
US9772397B1 (en) 2016-04-25 2017-09-26 Uhnder, Inc. PMCW-PMCW interference mitigation
US9791551B1 (en) 2016-04-25 2017-10-17 Uhnder, Inc. Vehicular radar system with self-interference cancellation
US9791564B1 (en) 2016-04-25 2017-10-17 Uhnder, Inc. Adaptive filtering for FMCW interference mitigation in PMCW radar systems
US9806914B1 (en) 2016-04-25 2017-10-31 Uhnder, Inc. Successive signal interference mitigation
US9846228B2 (en) 2016-04-07 2017-12-19 Uhnder, Inc. Software defined automotive radar systems
US9945935B2 (en) 2016-04-25 2018-04-17 Uhnder, Inc. Digital frequency modulated continuous wave radar using handcrafted constant envelope modulation
US9954955B2 (en) 2016-04-25 2018-04-24 Uhnder, Inc. Vehicle radar system with a shared radar and communication system
US10261179B2 (en) 2016-04-07 2019-04-16 Uhnder, Inc. Software defined automotive radar
US10573959B2 (en) 2016-04-25 2020-02-25 Uhnder, Inc. Vehicle radar system using shaped antenna patterns

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2924321A (en) * 1958-06-04 1960-02-09 Alan E Ziskind Remote control typewriter
US3292489A (en) * 1964-07-09 1966-12-20 Ibm Hierarchical search system
US3360657A (en) * 1964-11-25 1967-12-26 Jr Bernard Edward Shlesinger Light responsive cross bar switch
US3443332A (en) * 1967-01-26 1969-05-13 Alexander C Christy Apparatus for writing with hand manipulated light source
US3495232A (en) * 1966-10-07 1970-02-10 Westinghouse Electric Corp Display screen and switching matrix
US3534359A (en) * 1968-01-12 1970-10-13 Ibm Optical pointer for display system
US3613066A (en) * 1968-10-22 1971-10-12 Cii Computer input equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2924321A (en) * 1958-06-04 1960-02-09 Alan E Ziskind Remote control typewriter
US3292489A (en) * 1964-07-09 1966-12-20 Ibm Hierarchical search system
US3360657A (en) * 1964-11-25 1967-12-26 Jr Bernard Edward Shlesinger Light responsive cross bar switch
US3495232A (en) * 1966-10-07 1970-02-10 Westinghouse Electric Corp Display screen and switching matrix
US3443332A (en) * 1967-01-26 1969-05-13 Alexander C Christy Apparatus for writing with hand manipulated light source
US3534359A (en) * 1968-01-12 1970-10-13 Ibm Optical pointer for display system
US3613066A (en) * 1968-10-22 1971-10-12 Cii Computer input equipment

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956745A (en) * 1971-12-16 1976-05-11 The Marconi Company Limited Programmable keyboard arrangements
US4086588A (en) * 1972-06-02 1978-04-25 Canon Kabushiki Kaisha Signal generator
US4209255A (en) * 1979-03-30 1980-06-24 United Technologies Corporation Single source aiming point locator
US4485373A (en) * 1979-12-13 1984-11-27 I. E. I (Australia) Proprietary Limited Automatic security monitoring system
US4431870A (en) * 1982-02-25 1984-02-14 May George A Telephone system with computer generated dial pad and automatic dialing
US4713535A (en) * 1985-09-04 1987-12-15 Rhoades Randy L Optical keyboard
WO1994015315A1 (en) * 1992-12-23 1994-07-07 Bernhard Weixler System for optional control of functions of a pc
US6377238B1 (en) * 1993-04-28 2002-04-23 Mcpheters Robert Douglas Holographic control arrangement
US6097373A (en) * 1997-10-28 2000-08-01 Invotek Corporation Laser actuated keyboard system
US9939905B2 (en) * 2012-11-09 2018-04-10 Ross Conrad Labelson Optical control of display screens
US20140132503A1 (en) * 2012-11-09 2014-05-15 Ross Conrad Labelson Optical Control of Display Screens
US9689967B1 (en) 2016-04-07 2017-06-27 Uhnder, Inc. Adaptive transmission and interference cancellation for MIMO radar
US10261179B2 (en) 2016-04-07 2019-04-16 Uhnder, Inc. Software defined automotive radar
US9945943B2 (en) 2016-04-07 2018-04-17 Uhnder, Inc. Adaptive transmission and interference cancellation for MIMO radar
US9846228B2 (en) 2016-04-07 2017-12-19 Uhnder, Inc. Software defined automotive radar systems
US9753132B1 (en) 2016-04-25 2017-09-05 Uhnder, Inc. On-demand multi-scan micro doppler for vehicle
US9806914B1 (en) 2016-04-25 2017-10-31 Uhnder, Inc. Successive signal interference mitigation
US9791564B1 (en) 2016-04-25 2017-10-17 Uhnder, Inc. Adaptive filtering for FMCW interference mitigation in PMCW radar systems
US9945935B2 (en) 2016-04-25 2018-04-17 Uhnder, Inc. Digital frequency modulated continuous wave radar using handcrafted constant envelope modulation
US9791551B1 (en) 2016-04-25 2017-10-17 Uhnder, Inc. Vehicular radar system with self-interference cancellation
US9954955B2 (en) 2016-04-25 2018-04-24 Uhnder, Inc. Vehicle radar system with a shared radar and communication system
US9772397B1 (en) 2016-04-25 2017-09-26 Uhnder, Inc. PMCW-PMCW interference mitigation
US10573959B2 (en) 2016-04-25 2020-02-25 Uhnder, Inc. Vehicle radar system using shaped antenna patterns

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