CA1119451A - Method of making copies of information tracks on carriers - Google Patents
Method of making copies of information tracks on carriersInfo
- Publication number
- CA1119451A CA1119451A CA000285166A CA285166A CA1119451A CA 1119451 A CA1119451 A CA 1119451A CA 000285166 A CA000285166 A CA 000285166A CA 285166 A CA285166 A CA 285166A CA 1119451 A CA1119451 A CA 1119451A
- Authority
- CA
- Canada
- Prior art keywords
- ture
- carriers
- information
- image
- photosensitive compound
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/28—Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/52—Compositions containing diazo compounds as photosensitive substances
- G03C1/62—Metal compounds reducible to metal
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/58—Processes for obtaining metallic images by vapour deposition or physical development
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Abstract
ABSTRACT:
Photographic copying of plates having coded video and audio information of a very fine structure.
Use is made of aromatic diazosulphide as a photosen-sitive system in which after exposure a metal nuclei image is produced by contact with metal salt, which image is intensified by physical development to a metal image having a density below D = 1.
Photographic copying of plates having coded video and audio information of a very fine structure.
Use is made of aromatic diazosulphide as a photosen-sitive system in which after exposure a metal nuclei image is produced by contact with metal salt, which image is intensified by physical development to a metal image having a density below D = 1.
Description
The invention relates to a method of making copies oE information tracks on carriers and in part--icular of information tracks of a spiral-like struc-ture, in which audio and/or video information is stored in the form of frequency- or phase-modulated signals, and which structure is built up from blocks of variable length which lie in a flat plane separated by areas of variable length which also lie in a flat plane. This type of information tracks which i5 des-cribed in British Patent Specification 1,391~541 has a very fine structure; the length of the said blocks in practice is of the order of ljum and the width thereof is approximately 0.3/um.
It is known from United States Patent Specification 3,381,085 to photographically make copies of information tracks on which coded images are provided in the form of a spiral-like track of variable light transmission which has been written ; by means of a modulated electron beam. Such an information track has a rather coarse structure.
Photographical reproduction thereof does not present any problem.
.~
~ - 2 -~9 4~ ~EIN 85Q3 Z2.6.77 It hls been found, however, that .i.nformation tracks of` t;he lcind as described in British Patent Spe-cification l,391,541 cannot be copied as such photo-graphically Light scattering during the eYposure and the occurrence of deflection phenomena may produce annoying back ground no:ise.
The usual photographic emulsions on the basis of silver halide are -too coarse--grarlul.ar to be able to reprocluce the fine detai]s of the infor-: mation track without losses. Even emulsions of this kind having a very small grain, the so-called Iipp-mann emulsions, proved to be unfit for this purpose.
The occurrence of deflection phenomena which i5 associated with the fact that the wavelength of the light which is used for making the copy is of .
the same order of magnitude as the images to be co-p:ied, was experienced to be very annoyi.ng in~various systems, including sorne molecul.ar disperse ligh~-sensitive systelns, such as material whictl contains . an aromati.c d.iazosulpllonate and which aft;er expo-~
su:re is contacted with a solution containing me~r-curous :ions and possi~ly also silver ions so that physically developable mercury-or silve:r ama.1.gam nuclei are obtained.
hpart from this it has be~n f`ound that the di.a.70sulphonates are insuf`ficien-tly resistant PIIN ~503 ~2~6O77 to dit`fuslon so that a considerable part of the defi--nition :if the or:igi.nal would be lost. Moreover~ it is actually not obvious at all to photographically mal~e copies of` informa-tion tracks of` the above-mentioned kind, as obtained, f'or example, according to the method described in British Patent Speci~ication 1,447,a66. According to this method, a photolac;luer is provided on an information carrier of` clisc-form and, by rotation of the disc relatlve to a puncti--~orm source of radi.ati.on, in particu:l.ar a beam of radiation provided by a :Laser, is inte~ i.ttently e~
posed and not exposed during -variable times corres-ponding to the information, the photolacquer is developed and the desired informa-tion track i9 e tch-ed.
The information track thus COllSiStS of a relief image. When a copy is to be made herefrom photographically, a.n image in the carrier is ob~
tained wh:ioh e~tends substaIltially througrhollt the thiclcness o:~ the carri.er. It is not obvious at all that the whole video and audio information wou:l.d 'be transmit-ted completely by th:is.
lt has surprisingly been found no-~S llo1r-ever, that excellent copies of in~orn~ation carriers having a sp.iral~like informatioll track or a track built up f'rom concentric circles in ~rhich aud~o and/or video information is stored in the form of .
4~i PHN. 8503.
frequency- or phase-modulated signals in the form of blocks of variable lengths which lle in a flat plane, separated by regions of variable lengths which also lie in a flat plane are obtained according to the invention by means of the photographic system known from British Patent Specifica-tion 1,227,116. In this system use is made of photosensitive material consisting of a base layer in which a photosensi-tive compound is present which is of the type which after exposure provides a light reaction produc-t which is capable of reacting wi~h mercurous ions in the presence of moisture and preferably also in the presence of silver ions while separating mercury or silver amalgam which is deposited in the form of a physically developable metal nuclei image, which photosensitive compound is an aromatic diazosulphide of the structure ~ - N = N - S - R, Xn wherein the benzene ring may contain one or more substituents X and wherein R .is a branched or non-branched alkyl group or aralkyl group, the resulting nuclei image being developed to a density below D - 1 above the basic density of the carrier.
Reference should be made to Encyclopedia of Chemical Techno-logy -- E.G. Kirk-Other, Interscience Publishers, 2nd Edition, 1968, Volume 15, pages 367-371 - see especially Fiyure 3.
9 ~5~ Pll~ 03 22.6077 By thus developing to a comparati.vely low dens:ity, -the above--men.tioIIecl i.nterfering deflect-Lon images are sllppressed. lt is surprising in itsel,~
-that images havi,ng SllCh unusual lo~ densities are capable of comprising the full information.
In copies o~tained according to the inven--tion it i,s advantageous to read thern in reflection against a reflecting surface presentr The unblacken'~
ed parts of the inforrnatioll carrier will ref:lect the li.ght substant:ially unat-tenuatedly, ~hile the image parts absorb twice: once for the inci.dent light and once for the reflected light, For this pUrpoSQ~ the copy may preferably be provided with a reflect:ing metal layer~ for exam-ple a vapour-deposited alun1inium layer.
The invention will now be descr~bed with reference to a few exampl~s: , ple 1 Plates of polymethylmethacrylate hav:lng a diameter of 31~0 mm and a thicl~ness of 1 mm are c:Leaned and then provided with a layer o:C cellul.ose acetobutyrate. For this purpose a 7 . 5% solui;ion of this mater.ial in the qualit)r Tenite II of ~astman Kodak in a mixture of solvents of methylglycol--ace-tate-ethanol in a volume ratio of 8:2 is dis-tributed over tlle .surface by mecLns o:f centrifugingr at a. speed of' 2'75 rpm ~or 1 minute. The layer is 94S~
PHN ~53 22.6,77 dried in the horizontal pos:ition for 1 hour at 70~
in a furnace havi.ng forced ai.r circulation, 'L'he dried laye.r has a thickness of 4/um. 'rhe cellulose acetobutyrate layer is made hydrophilic by saponi-ficatioll and then m,ade photosensitive by means of the fo].lowing treatment s-teps:
a) soaking for 5 mimltes in a 6 . 5~o solution of 20C
of KOH in a methanol-wa-ter mi~ture in a ~olume ratio ~,:2.
b) soaking for 1 minute in a 9% solution of lactic acid in a methanol-water mixture ~8:2) , c) soalcing for 1 minute in a 1% so].ution in de-~t~ ~ a~
rninerali~ed water of "Lissapol N",~a conderlsa-tion product of ethylelle o~ide with al.kyl phs-nols;
d) rinsing for 5 minutes in running demineralized water ' ' e) 3 x soaking for 1 minute i.n propanol--1 f) soaking for 3 minutes in a 0.1 molar so].ut:ion of 3.5 dichloro~ dir(Ie-thylanlinob~n~eIle diazo tertiarybutyls1ll.phide in propanol-1, after ~h:ich the a.dh.ering liquid is flung away ~`or 'I minuto at a speed of 1000 rpm. The thickness of the result:ing photosen~s:itiv~ layer is 2/um. The
It is known from United States Patent Specification 3,381,085 to photographically make copies of information tracks on which coded images are provided in the form of a spiral-like track of variable light transmission which has been written ; by means of a modulated electron beam. Such an information track has a rather coarse structure.
Photographical reproduction thereof does not present any problem.
.~
~ - 2 -~9 4~ ~EIN 85Q3 Z2.6.77 It hls been found, however, that .i.nformation tracks of` t;he lcind as described in British Patent Spe-cification l,391,541 cannot be copied as such photo-graphically Light scattering during the eYposure and the occurrence of deflection phenomena may produce annoying back ground no:ise.
The usual photographic emulsions on the basis of silver halide are -too coarse--grarlul.ar to be able to reprocluce the fine detai]s of the infor-: mation track without losses. Even emulsions of this kind having a very small grain, the so-called Iipp-mann emulsions, proved to be unfit for this purpose.
The occurrence of deflection phenomena which i5 associated with the fact that the wavelength of the light which is used for making the copy is of .
the same order of magnitude as the images to be co-p:ied, was experienced to be very annoyi.ng in~various systems, including sorne molecul.ar disperse ligh~-sensitive systelns, such as material whictl contains . an aromati.c d.iazosulpllonate and which aft;er expo-~
su:re is contacted with a solution containing me~r-curous :ions and possi~ly also silver ions so that physically developable mercury-or silve:r ama.1.gam nuclei are obtained.
hpart from this it has be~n f`ound that the di.a.70sulphonates are insuf`ficien-tly resistant PIIN ~503 ~2~6O77 to dit`fuslon so that a considerable part of the defi--nition :if the or:igi.nal would be lost. Moreover~ it is actually not obvious at all to photographically mal~e copies of` informa-tion tracks of` the above-mentioned kind, as obtained, f'or example, according to the method described in British Patent Speci~ication 1,447,a66. According to this method, a photolac;luer is provided on an information carrier of` clisc-form and, by rotation of the disc relatlve to a puncti--~orm source of radi.ati.on, in particu:l.ar a beam of radiation provided by a :Laser, is inte~ i.ttently e~
posed and not exposed during -variable times corres-ponding to the information, the photolacquer is developed and the desired informa-tion track i9 e tch-ed.
The information track thus COllSiStS of a relief image. When a copy is to be made herefrom photographically, a.n image in the carrier is ob~
tained wh:ioh e~tends substaIltially througrhollt the thiclcness o:~ the carri.er. It is not obvious at all that the whole video and audio information wou:l.d 'be transmit-ted completely by th:is.
lt has surprisingly been found no-~S llo1r-ever, that excellent copies of in~orn~ation carriers having a sp.iral~like informatioll track or a track built up f'rom concentric circles in ~rhich aud~o and/or video information is stored in the form of .
4~i PHN. 8503.
frequency- or phase-modulated signals in the form of blocks of variable lengths which lle in a flat plane, separated by regions of variable lengths which also lie in a flat plane are obtained according to the invention by means of the photographic system known from British Patent Specifica-tion 1,227,116. In this system use is made of photosensitive material consisting of a base layer in which a photosensi-tive compound is present which is of the type which after exposure provides a light reaction produc-t which is capable of reacting wi~h mercurous ions in the presence of moisture and preferably also in the presence of silver ions while separating mercury or silver amalgam which is deposited in the form of a physically developable metal nuclei image, which photosensitive compound is an aromatic diazosulphide of the structure ~ - N = N - S - R, Xn wherein the benzene ring may contain one or more substituents X and wherein R .is a branched or non-branched alkyl group or aralkyl group, the resulting nuclei image being developed to a density below D - 1 above the basic density of the carrier.
Reference should be made to Encyclopedia of Chemical Techno-logy -- E.G. Kirk-Other, Interscience Publishers, 2nd Edition, 1968, Volume 15, pages 367-371 - see especially Fiyure 3.
9 ~5~ Pll~ 03 22.6077 By thus developing to a comparati.vely low dens:ity, -the above--men.tioIIecl i.nterfering deflect-Lon images are sllppressed. lt is surprising in itsel,~
-that images havi,ng SllCh unusual lo~ densities are capable of comprising the full information.
In copies o~tained according to the inven--tion it i,s advantageous to read thern in reflection against a reflecting surface presentr The unblacken'~
ed parts of the inforrnatioll carrier will ref:lect the li.ght substant:ially unat-tenuatedly, ~hile the image parts absorb twice: once for the inci.dent light and once for the reflected light, For this pUrpoSQ~ the copy may preferably be provided with a reflect:ing metal layer~ for exam-ple a vapour-deposited alun1inium layer.
The invention will now be descr~bed with reference to a few exampl~s: , ple 1 Plates of polymethylmethacrylate hav:lng a diameter of 31~0 mm and a thicl~ness of 1 mm are c:Leaned and then provided with a layer o:C cellul.ose acetobutyrate. For this purpose a 7 . 5% solui;ion of this mater.ial in the qualit)r Tenite II of ~astman Kodak in a mixture of solvents of methylglycol--ace-tate-ethanol in a volume ratio of 8:2 is dis-tributed over tlle .surface by mecLns o:f centrifugingr at a. speed of' 2'75 rpm ~or 1 minute. The layer is 94S~
PHN ~53 22.6,77 dried in the horizontal pos:ition for 1 hour at 70~
in a furnace havi.ng forced ai.r circulation, 'L'he dried laye.r has a thickness of 4/um. 'rhe cellulose acetobutyrate layer is made hydrophilic by saponi-ficatioll and then m,ade photosensitive by means of the fo].lowing treatment s-teps:
a) soaking for 5 mimltes in a 6 . 5~o solution of 20C
of KOH in a methanol-wa-ter mi~ture in a ~olume ratio ~,:2.
b) soaking for 1 minute in a 9% solution of lactic acid in a methanol-water mixture ~8:2) , c) soalcing for 1 minute in a 1% so].ution in de-~t~ ~ a~
rninerali~ed water of "Lissapol N",~a conderlsa-tion product of ethylelle o~ide with al.kyl phs-nols;
d) rinsing for 5 minutes in running demineralized water ' ' e) 3 x soaking for 1 minute i.n propanol--1 f) soaking for 3 minutes in a 0.1 molar so].ut:ion of 3.5 dichloro~ dir(Ie-thylanlinob~n~eIle diazo tertiarybutyls1ll.phide in propanol-1, after ~h:ich the a.dh.ering liquid is flung away ~`or 'I minuto at a speed of 1000 rpm. The thickness of the result:ing photosen~s:itiv~ layer is 2/um. The
2~ mate-rial :is stored in a nitrogen atmosphere. The e~posu:re is carried out by nIeans of a high pres-sure mercury lamp. For tha-t purpose, a photosen3iti~,7e ,; , , -45~
PIIN ~503 22.~.77 plate in a cassette i.s brough-t in very ciose contact ~:ith the information ca3r:ier to be copied con~istlng o~ a glass plate having a chromiurn layer in ~hlch the video and audio inforrnation is recorded. The exposure is carried out with a 125 1~ HPR lamp ~or 40 seconds at a distance of 1 metre. In the light path a correction filter with a density D = 1 is placed so as to obtain a homogeIleous exposure, A.fter t:he e~posure the pla-te is Icept im~
mersed in a nuclei-:form:ing bath for 2 seconds, ; which bath conta;.ns per litre 0~0~5 rnol (Hg2(N03)2 0.025 mol AgN03 and 0.01 mol HN03, .
is then rinsed in denlineralized ~ater for 4 seconds and developed for 45 seconds in a developer ~hich is kept at 20C and has the corriposition per litre:
0.0~ mol ferrou.s ammoni.um slllphate 0.01 n1o.L f;erric nitrate 0.01 mol silver ni.trate 0.03 mol citr:i.c acid (tl~ac~le rn q~K ) O, 02% I'Armac 1 2D~'A~ncl 0.02t~ "Lisaapol. N", rinsed in deminerali.zed ~ater f OI` 60 seco~lds, in propanol-1 for 60 seconcl.s a.nd fillally dried in a dust-f`ree cupboard. The achi.e~-ed density is S
~ ~ .
PM~ ~0, 22.6.7 n - o.3.
On the -irnage si.clc Or tlle cop~r an alurninium layer i.5 vapour-deposited and the pllotographic ima~e is reas as a reflection image from -the rear side.
The quality of the image and the sound cannot be disti.nguished frorll tha-t of the original.
"Armac 12D" is an anionogenic wetting : agent ~rhich consists of dodecylamine acetate for- ap-pro~in1ate].y 90%~ of tetradecyla.mille acetate ~or ap-pro~imately 9,~ and of acetates of hlgher alkyl-ami.nes ~or the rernainder.
E~arnE~ 2 . Gla.ss plates having a diarneter o~ 340 mm : ancl a thicl~ness o:~ 5 mm are cleaned and then pro-: 15 vided with a layer of` chromium, approxiMately 45 ~
thick, by vapour deposition. Hereon an.appro~i.mate-: ly 25 ~ thick Ti.02 layer is provicled by dipping the plates in a 2, 5% solution of titane acet~rl acetol1ate in propanol-2, dra1~ingr them up slowly and then heat-ing them at 200C. The plates a.re co~ered ~ith a oellulose-acetobutyrate layer in the manner as clescribed in the prececling example, made photo sensitive, nucleated and developed. The e~pvsure - time and/or developmellt t:ime are chosen to be one third to one quarter ~horter becau.se thc chrolnium layc-r a:Lready present dllring the e~posure may give rise to noise. The dansity cannot be measured clirec.t~
~ ' _ g _ ~ .
: `:
~L9~
P~IN .X503 22 , G . 7 7 ly due to the preserl.ce O:r -t,he chrorni.wm l.ayer; it is esti.matecl to have a va:l-7.e D _ 0.2. The copy made in thi.s manner can be read direc-tly in re~lection from the front side. The quali.ty of` the small image and the sound callnot be distinguished f`rom th.a-t of the original, According to this method it is possible to provide a plate on both sides ~ith an information track.
~ ` .
; ' ' ' -' -- ~ O
PIIN ~503 22.~.77 plate in a cassette i.s brough-t in very ciose contact ~:ith the information ca3r:ier to be copied con~istlng o~ a glass plate having a chromiurn layer in ~hlch the video and audio inforrnation is recorded. The exposure is carried out with a 125 1~ HPR lamp ~or 40 seconds at a distance of 1 metre. In the light path a correction filter with a density D = 1 is placed so as to obtain a homogeIleous exposure, A.fter t:he e~posure the pla-te is Icept im~
mersed in a nuclei-:form:ing bath for 2 seconds, ; which bath conta;.ns per litre 0~0~5 rnol (Hg2(N03)2 0.025 mol AgN03 and 0.01 mol HN03, .
is then rinsed in denlineralized ~ater for 4 seconds and developed for 45 seconds in a developer ~hich is kept at 20C and has the corriposition per litre:
0.0~ mol ferrou.s ammoni.um slllphate 0.01 n1o.L f;erric nitrate 0.01 mol silver ni.trate 0.03 mol citr:i.c acid (tl~ac~le rn q~K ) O, 02% I'Armac 1 2D~'A~ncl 0.02t~ "Lisaapol. N", rinsed in deminerali.zed ~ater f OI` 60 seco~lds, in propanol-1 for 60 seconcl.s a.nd fillally dried in a dust-f`ree cupboard. The achi.e~-ed density is S
~ ~ .
PM~ ~0, 22.6.7 n - o.3.
On the -irnage si.clc Or tlle cop~r an alurninium layer i.5 vapour-deposited and the pllotographic ima~e is reas as a reflection image from -the rear side.
The quality of the image and the sound cannot be disti.nguished frorll tha-t of the original.
"Armac 12D" is an anionogenic wetting : agent ~rhich consists of dodecylamine acetate for- ap-pro~in1ate].y 90%~ of tetradecyla.mille acetate ~or ap-pro~imately 9,~ and of acetates of hlgher alkyl-ami.nes ~or the rernainder.
E~arnE~ 2 . Gla.ss plates having a diarneter o~ 340 mm : ancl a thicl~ness o:~ 5 mm are cleaned and then pro-: 15 vided with a layer of` chromium, approxiMately 45 ~
thick, by vapour deposition. Hereon an.appro~i.mate-: ly 25 ~ thick Ti.02 layer is provicled by dipping the plates in a 2, 5% solution of titane acet~rl acetol1ate in propanol-2, dra1~ingr them up slowly and then heat-ing them at 200C. The plates a.re co~ered ~ith a oellulose-acetobutyrate layer in the manner as clescribed in the prececling example, made photo sensitive, nucleated and developed. The e~pvsure - time and/or developmellt t:ime are chosen to be one third to one quarter ~horter becau.se thc chrolnium layc-r a:Lready present dllring the e~posure may give rise to noise. The dansity cannot be measured clirec.t~
~ ' _ g _ ~ .
: `:
~L9~
P~IN .X503 22 , G . 7 7 ly due to the preserl.ce O:r -t,he chrorni.wm l.ayer; it is esti.matecl to have a va:l-7.e D _ 0.2. The copy made in thi.s manner can be read direc-tly in re~lection from the front side. The quali.ty of` the small image and the sound callnot be distinguished f`rom th.a-t of the original, According to this method it is possible to provide a plate on both sides ~ith an information track.
~ ` .
; ' ' ' -' -- ~ O
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS
1. A method of making copies of information carriers having a spiral-like information track or a track built up from concentric circles, in which audio and/or video information is stored in the form of frequency- or phase-modulated signals in the form of blocks of variable lengths which lie in a flat plane, separated by regions of variable lengths which likewise lie in a flat plane, characterized in that use is made of a photosensitive material consisting of a base layer in which a photosensitive compound is present which is of the type which after exposure provides a light reaction product which is reacted with mercurous ions in the presence of mois-ture to separate mercury which is deposited in the form of a physically developable metal nuclei image, which photosensitive compound is an aromatic diazosulphide of the struc-ture wherein the benzene ring may contain one or more substituents X and wherein R is a branched or non-PHN. 8503.
branched alkyl group or aralkyl group, and N is an integer from 0 to 5 inclusive, the resulting nuclei image being developed to a low density above the basic density of the carriers and below D = 1.
branched alkyl group or aralkyl group, and N is an integer from 0 to 5 inclusive, the resulting nuclei image being developed to a low density above the basic density of the carriers and below D = 1.
2. A method as claimed in Claim 1 wherein the photosensitive compound is reacted in the presence of mois-ture and silver ions.
3. A method as claimed in Claim 1, characterized in that the copy is manufactured on a transparent carrier to read in reflection against a reflective surface present.
4. A method as claimed in Claim 3, characterized in that the copy has a reflecting metal layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7609610A NL7609610A (en) | 1976-08-30 | 1976-08-30 | METHOD FOR MAKING COPIES OF TRACKS OF INFORMATION ON CARRIERS. |
| NL7609610 | 1976-08-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119451A true CA1119451A (en) | 1982-03-09 |
Family
ID=19826817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000285166A Expired CA1119451A (en) | 1976-08-30 | 1977-08-18 | Method of making copies of information tracks on carriers |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS5329714A (en) |
| AT (1) | AT355421B (en) |
| AU (1) | AU515051B2 (en) |
| CA (1) | CA1119451A (en) |
| DE (1) | DE2736949A1 (en) |
| ES (1) | ES461925A1 (en) |
| FR (1) | FR2363160A1 (en) |
| GB (1) | GB1568722A (en) |
| IT (1) | IT1086124B (en) |
| NL (1) | NL7609610A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56132335A (en) * | 1980-02-11 | 1981-10-16 | Fuji Photo Film Co Ltd | Optical recording medium and its manufacture |
| JP2016038435A (en) | 2014-08-06 | 2016-03-22 | ソニー株式会社 | Encoding device and method, decoding device and method, and program |
-
1976
- 1976-08-30 NL NL7609610A patent/NL7609610A/en not_active Application Discontinuation
-
1977
- 1977-08-17 DE DE19772736949 patent/DE2736949A1/en not_active Withdrawn
- 1977-08-18 CA CA000285166A patent/CA1119451A/en not_active Expired
- 1977-08-26 IT IT2701877A patent/IT1086124B/en active
- 1977-08-26 GB GB3593677A patent/GB1568722A/en not_active Expired
- 1977-08-27 ES ES461925A patent/ES461925A1/en not_active Expired
- 1977-08-27 JP JP10221077A patent/JPS5329714A/en active Pending
- 1977-08-29 AT AT622577A patent/AT355421B/en not_active IP Right Cessation
- 1977-08-29 FR FR7726193A patent/FR2363160A1/en active Granted
- 1977-08-29 AU AU28317/77A patent/AU515051B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL7609610A (en) | 1978-03-02 |
| JPS5329714A (en) | 1978-03-20 |
| FR2363160A1 (en) | 1978-03-24 |
| AT355421B (en) | 1980-03-10 |
| ES461925A1 (en) | 1978-05-16 |
| ATA622577A (en) | 1979-07-15 |
| AU2831777A (en) | 1979-03-08 |
| FR2363160B1 (en) | 1982-04-23 |
| AU515051B2 (en) | 1981-03-12 |
| GB1568722A (en) | 1980-06-04 |
| IT1086124B (en) | 1985-05-28 |
| DE2736949A1 (en) | 1978-03-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |