GB2129150A - A method of transferring information to a recording medium - Google Patents

A method of transferring information to a recording medium Download PDF

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Publication number
GB2129150A
GB2129150A GB08227752A GB8227752A GB2129150A GB 2129150 A GB2129150 A GB 2129150A GB 08227752 A GB08227752 A GB 08227752A GB 8227752 A GB8227752 A GB 8227752A GB 2129150 A GB2129150 A GB 2129150A
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GB
United Kingdom
Prior art keywords
information
light beams
images
light
modulated
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.)
Granted
Application number
GB08227752A
Other versions
GB2129150B (en
Inventor
Roger Ernest Cooke
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB08227752A priority Critical patent/GB2129150B/en
Priority to KR1019830004553A priority patent/KR840006418A/en
Priority to JP58179485A priority patent/JPS5990825A/en
Priority to ES526108A priority patent/ES526108A0/en
Priority to EP83109752A priority patent/EP0104662A3/en
Publication of GB2129150A publication Critical patent/GB2129150A/en
Application granted granted Critical
Publication of GB2129150B publication Critical patent/GB2129150B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H04N1/126—Arrangements for the main scanning
    • H04N1/1275—Arrangements for the main scanning using a solid-state deflector, e.g. an acousto-optic deflector or a semiconductor waveguide device
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/33—Acousto-optical deflection devices
    • G02F1/335—Acousto-optical deflection devices having an optical waveguide structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H04N1/19505—Scanning picture elements spaced apart from one another in at least one direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H04N1/19505—Scanning picture elements spaced apart from one another in at least one direction
    • H04N1/1951—Scanning picture elements spaced apart from one another in at least one direction in one direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H04N1/19505—Scanning picture elements spaced apart from one another in at least one direction
    • H04N1/19521—Arrangements for moving the elements of the array relative to the scanned image or vice versa
    • H04N1/19526—Optical means
    • H04N1/19536—Refracting elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/203—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/203—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet
    • H04N1/2032—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet of two pictures corresponding to two sides of a single medium

Abstract

A method of transferring information comprising providing two lasers 22, 23, modulating 24 the lasers with information, coupling the laser outputs into two surface acoustic wave deflection devices 20, 21 mounted "back-to-back" on a common substrate, and focussing the resultant scanned modulated light beams onto two surfaces 25, 26 moving transverse the direction of scanning. Typically the two surfaces are selenium drums on which electrostatic images are formed for subsequent transfer as permanent visual images on a sheet of paper 27. The invention has application as a high speed printer or facsimile apparatus. <IMAGE>

Description

SPECIFICATION A method of transferring information to a recording medium This invention relates to a method and apparatus for transferring information to and from a recording medium.
Recent advances in telecommunications and electronics have given rise to requirements for the high speed transmittal and reproduction of information over electrical or optical communications systems and these have, in turn, provided needs for high speed recording and/or reading of such information. Hitherto systems such as telex have provided both transmission means and recording means. However such systems are comparatively slow by present day standards, when digital computers are capable of very high data processing rates and can transmit data to remote locations at speeds much higher than those which electro-mechanical printing methods can handle. There is thus currently an interest in recording and reading information by means which are not subject to the general limitations of electromechanical devices.
In a printer there are basically two requirements. Firstly there is a requirement to transfer information in the form of characters to a print position, i.e. a line across a recording medium. Secondly there is the requirement that there be relative movement between the recording medium and the print position in a direction transverse the lines of characters. The first requirement usually necessitates a means for repetitively scanning across the recording medium at high speeds which are compatible with those at which text and/or data processing equipments operate and which can be faster than those generally obtainable with electromechanical printing techniques. The second requirement can usually be met satisfactorily by physical movement of the recording medium by electromechanical means.The term recording medium is used herein to include not only the final paper product bearing visual characters but also intermediate means such as selenium drum transfer apparatus used to transfer prepared visual characters to a paper page. As for reading information from e.g. a document, similar considerations apply.
According to one aspect of the present invention there is provided a method of transferring information comprising providing two light beams, applying each light beam to an individual surface acoustic wave optical deflection device having transducers for causing surface acoustic waves, applying deflection control signals to the transducers so as to scan the light beams and applying the scanning light beams to a surface or surfaces moving in a direction transversely of the scan direction whereby the scans are parallel, and modulating at least one of said light beams with information.
According to a second aspect of the invention there is provided apparatus for transferring information comprising means for producing two beams of light, two individual surface acoustic wave optical deflection devices each having transducers for causing surface waves, means for applying each light beam to a respective one of the deflection devices, means for applying deflection control signals to the transducers of each device so as to scan the light beams, means for applying the scanning light beams to a surface or surfaces, means for moving the surface or surfaces in a direction transversely of the scan direction whereby the scans are parallel, and means for modulating at least one of said light beams with information.
According to a third aspect of the invention there is provided a surface acoustic wave optical scanning device having on opposite surfaces of the common substrate layers of optical waveguide material in which surface acoustic waves can be propagated, transducer means on each layer to launch surface acoustic waves into the layers, and optical coupling means on each layer whereby light can be coupled into and out of each layer, the light being propagated in each layer in a direction transverse the direction of propagation of surface acoustic waves.
Embodiments of the invention will now be described with reference to the accompanying drawings, in which: Fig. 1 illustrates a basic surface acoustic wave deflection device for a modulated beam of light; Fig. 2 illustrates a double sided printing arrangement: Fig. 3 illustrates a two colour printing arrangement; Fig. 4 illustrates a double copy printing arrangement; and Fig. 5 illustrates a character reading arrangement.
The basic surface acoustic wave deflection device shown in Fig. 1 comprises a substrate 10 supporting a layer 11 of waveguide material in which surface acoustic waves 12 can be propagated from transducer 1 3. A beam of modulated light from a laser 14 is directed via collimating optics 1 5 onto a prism 1 6 whereby the light is coupled into the layer of waveguide material, the light propagating in a direction transverse the direction of propagation of the surface acoustic waves The light is coupled out of the waveguide material by a second prism 1 7 and is focussed by optics 1 8 onto a surface 19.When an r.f. signal is applied to the transducer 13 a surface acoustic wave pattern is propagated across the path of the light and a Bragg deflection of the light occurs. By suitably modulating the r.f.
signal the Bragg deflection can cause a focussed spot of light to scan the surface 1 9. The surface 19 can then be moved incrementally in synchronism with the scanning beam to provide a line-by-line coverage of the surface. The r.f.
scanning signals are similarly synchronised with the modulation signals applied to the laser. Thus, in a printing arrangement characters can be builtup in a manner similar to that already known in certain types of facsimile apparatus in which the scanning of a rotating recording medium is achieved electro-mechanically. The advantage of the arrangement shown in Fig. 1 is that it has no moving parts other than those required to move the surface 1 9 past the single scanning line position. Hence the scanning and modulation of the light beam can be accomplished at very high speeds. If the surface 19 is a selenium drum as is used in photocopiers images can be built-up very rapidly on the drum and these images can then be transferred in permanent visual form to paper by standard photocopier techniques.
However, there are various applications in which optical scanning techniques can be adapted to provide high speed work stations with functional needs for data input, output and storage. In particuiar two surface acoustic wave deflection devices fabricated in "back-to-back" configuration on a common substrate can provide two scanning operations which may be interreiated or independent.
In the arrangement shown in Fig. 2 two surfaces acoustic wave deflection devices 20, 21 are formed on a common substrate. Each deflection device is of the type shown in Fig. 1, i.e.
each device has its own optical coupling means and r.f. signal transducer. The two deflection devices are provided with independent laser sources 22, 23 (for the sake of simplicity all the collimating and focussing optics have been omitted from this and subsequent Figures -- such optics are assumed and there is no special inventive merit in their provision in any of the special applications being described). Input data is received by a control circuit 24 where timing information is extracted and timing modulation controls generated. The two lasers are independentiy modulated whilst the deflection devices are operated in synchronism so as to build-up two sets of images on respective selenium drums 25, 26.Using conventional electrostatic copier techniques the two sets of images are then transferred in permanent visual form to two sides of a single sheet recording medium 27, i.e. a sheet of paper. This double sided printer can print the two sides of the paper in the same or different colours. It will be appreciated that the input data can be derived from a remote location from whence it can be transmitted to the printer via electric conductors, optical fibres or even radio signals.
In the arrangement shown in Fig. 3 independent printing is effected by two drums on the same side of the paper or the like, thus enabiing two colour printing to be effected. In the arrangement shown in Fig. 4 the same modulation is applied to both lasers. In this simuitaneous printing of an original and a copy are achieved, e.g.
on identical sheets of paper, two different colours or grades of paper or on one sheet of paper and one sheet of a different material.
The invention is particularly suitable for operation in a full duplex facsimile system. In this case only one of the surface acoustic wave deflection devices is provided with information modulated light for printing via a selenium drum.
The deflection device scans unmodulated light across a platen 30, Fig. 5, on which graphical material is carried, e.g. a drum with paper wrapped around it.
Light reflected from the paper is picked up at a photodetector 31 and electrical signals are thereby derived which can be sent to a similar dupiex facsimile machine at a remote location.
In a practical system the degree of deflection obtainable from a surface acoustic wave device, typically +1.5C, may require an excessive distance between the deflection device and the scanned surface. This requirement can largely be overcome by incorporating scan expansion optics which will form a line scan of the required length at a "practical" distance from the deflector. These scan expansion optics are designed according to well known optical principles.
As an alternative to providing two lasers, one for each beam of light, a single laser can be used with beam splitting optics and external modulator(s). Furthermore, whilst one of the light beams may be recording electrostatic images on a selenium drum the other light beam may be recording data directly on specially sensitised paper.

Claims (21)

1. A method of transferring information comprising providing two light beams, applying each light beam to an individual surface acoustic wave optical deflection device having transducers for causing surface acoustic waves, applying deflection control signals to the transducers so as to scan the light beams and applying the scanning light beams to a surface or surfaces moving in a direction transversely of the scan direction whereby the scans are parallel, and modulating at least one of said light beams with information.
2. A method according to claim 1 wherein said light beams are simultaneously modulated with different information signals and applied to two surfaces each sensitive to a respective one of the light beams to record the information in the form of transient images, and subsequently transferring said images in permanent visual form to two sides respectively of a sheet recording medium.
3. A method according to claim 1 wherein said light beams are simultaneously modulated with different information signals and applied to two surfaces each sensitive to a respective one of the light beams to record the information in the form of transient images, and subsequently transferring said images in permanent visual form sequentially to a common surface of a sheet recording medium.
4. A method according to claim 1 wherein said light beams are simultaneously modulated with the information signals and applied to two surfaces each sensitive to a respective one of the light beams to record the information in the form of transient images, and subsequently transferring said images in permanent visual form simultaneously to two respective sheet recording media.
5. A method according to claim 3 or 4 wherein said visual images are transferred in different colours.
6. A method according to claim 1 wherein one of said light beams is modulated with information signals and applied to a surface sensitive to the light beam to record the information in the form of transient images, and subsequently transferring said images in permanent visual form to a sheet recording medium, and said other light beam is applied simultaneously to a surface having recorded thereon visual images whereby light reflected from the surface is directed to a photodetector means to create information carrying electrical signals.
7. A method according to any one of claims 2-7 wherein said light sensitive surface(s) are selenium drums to which electrostatic powder materials are applied for transfer to sheet recording media.
8. A method of transferring information substantially as described with reference to the accompanying drawings.
9. Apparatus for transferring information comprising means for producing two beams of light, two individual surface acoustic wave optical deflection devices each having transducers for causing surface waves, means for applying each light beam to a respective one of the deflection devices, means for applying deflection control signals to the transducers of each device so as to scan the light beams, means for applying the scanning light beams to a surface or surfaces, means for moving the surface or surfaces in a direction transversely of the scan direction whereby the scans are parallel, and means for modulating at least one of said light beams with information.
1 0. Apparatus according to claim 9 including means for simultaneously modulating both light beams with different information signals, each modulated and scanned light beam being applied to a respective one of two surfaces each sensitive to a light beam to record thereon the information in the form of transient images, and means for subsequently transferring said images in permanent visual form to two sides respectively of a sheet recording medium.
11. Apparatus according to claim 9 including means for simultaneously modulating both light beams with different information signals, each modulated and scanned light beam being applied to a respective one of two surfaces each sensitive to a light beam to record thereon the information in the form of transient images, and means for subsequently transferring said images in permanent visual form sequentially to a common surface of a sheet recording medium.
12. Apparatus according to claim 9 including means for simultaneously modulating both light beams with the same information signals, each modulated and scanned light beam being applied to a respective one of two surfaces each sensitive to a light beam to record thereon the information in the form of transient images, and means for subsequently transferring said images in permanent visual form simultaneously to two respective sheet recording media.
1 3. Apparatus according to claim 10. 11 or 12 wherein said visual images are transferred in different colours.
14. Apparatus according to claim 9 wherein only one of the light beams is modulated with information signals, the modulated and unmodulated beams being scanned simultaneously and applied to two surfaces one of which is sensitive to the modulated light beam to record thereon the information in the form of transient images, the apparatus including means for subsequently transferring the transient images in permanent visual form to a sheet recording medium, said other surface being scanned by the unmodulated light beam, the apparatus including photodetector means responsive to light reflected from said other surface to produce information signals from visual images carried on said other surface.
1 5. Apparatus according to any one of claims 10-14 wherein said light sensitive surface(s) are selenium drums to which electrostatic powder materials are applied for transfer to sheet recording media.
1 6. Apparatus according to any one of claims 9-1 5 wherein said means for producing light beams are lasers.
17. Appartus according to any one of claims 9-1 5 wherein said means for producing light beams comprises a laser with beam splitting optics and external modualting means.
18. Apparatus according to any one of claims 9-1 6 wherein the two surface acoustic wave devices are fabricated on opposite surfaces of a common supporting substrate.
1 9. Apparatus according to claim 1 7 wherein the light beams are coupled into and out of the surface acoustic wave devices by prism couplers.
20. Apparatus for transferring information substantially as described with reference to the accompanying drawings.
21. A surface acoustic wave optical scanning device having on opposite surfaces of a common substrate layers of optical waveguide material in which surface acoustic waves can be propagated, transducer means on each layer to launch surface acoustic waves into the layers, and optical coupling means on each layer whereby light can be coupled into and out of each layer, the light being propagated in each layer in a direction transverse the direction of propagation of surface acoustic waves.
GB08227752A 1982-09-29 1982-09-29 A method of transferring information to a recording medium Expired GB2129150B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB08227752A GB2129150B (en) 1982-09-29 1982-09-29 A method of transferring information to a recording medium
KR1019830004553A KR840006418A (en) 1982-09-29 1983-09-28 Method of transmitting information to recording medium and apparatus
JP58179485A JPS5990825A (en) 1982-09-29 1983-09-29 Method and apparatus for transferring information to recording medium
ES526108A ES526108A0 (en) 1982-09-29 1983-09-29 A METHOD AND A DEVICE TO TRANSFER INFORMATION TO A REGISTRY MEDIA
EP83109752A EP0104662A3 (en) 1982-09-29 1983-09-29 Method and apparatus for transferring information signals to and/or off a recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08227752A GB2129150B (en) 1982-09-29 1982-09-29 A method of transferring information to a recording medium

Publications (2)

Publication Number Publication Date
GB2129150A true GB2129150A (en) 1984-05-10
GB2129150B GB2129150B (en) 1986-07-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08227752A Expired GB2129150B (en) 1982-09-29 1982-09-29 A method of transferring information to a recording medium

Country Status (4)

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JP (1) JPS5990825A (en)
KR (1) KR840006418A (en)
ES (1) ES526108A0 (en)
GB (1) GB2129150B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173665A (en) * 1985-02-21 1986-10-15 Canon Kk Copying apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1408838A (en) * 1972-06-02 1975-10-08 Thomson Csf Optical deflector arrangement for use in holographic data storage devices
GB1580364A (en) * 1976-03-26 1980-12-03 Eastman Kodak Co Acoustooptic diffraction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1408838A (en) * 1972-06-02 1975-10-08 Thomson Csf Optical deflector arrangement for use in holographic data storage devices
GB1580364A (en) * 1976-03-26 1980-12-03 Eastman Kodak Co Acoustooptic diffraction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173665A (en) * 1985-02-21 1986-10-15 Canon Kk Copying apparatus
GB2205212A (en) * 1985-02-21 1988-11-30 Canon Kk Copying apparatus
GB2173665B (en) * 1985-02-21 1989-07-19 Canon Kk Copying apparatus
GB2205212B (en) * 1985-02-21 1989-07-26 Canon Kk Copying apparatus

Also Published As

Publication number Publication date
GB2129150B (en) 1986-07-16
KR840006418A (en) 1984-11-29
ES8503147A1 (en) 1984-12-16
JPS5990825A (en) 1984-05-25
ES526108A0 (en) 1984-12-16

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