US2726179A - Recording tapes having a metal layer applied by vapour deposition - Google Patents
Recording tapes having a metal layer applied by vapour deposition Download PDFInfo
- Publication number
- US2726179A US2726179A US265304A US26530452A US2726179A US 2726179 A US2726179 A US 2726179A US 265304 A US265304 A US 265304A US 26530452 A US26530452 A US 26530452A US 2726179 A US2726179 A US 2726179A
- Authority
- US
- United States
- Prior art keywords
- metal layer
- cadmium
- vapour deposition
- recording tapes
- recording
- 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 - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 title description 25
- 239000002184 metal Substances 0.000 title description 25
- 230000008021 deposition Effects 0.000 title description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 10
- 229910052793 cadmium Inorganic materials 0.000 claims description 9
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 9
- 229910000925 Cd alloy Inorganic materials 0.000 claims description 3
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 description 7
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010073150 Multiple endocrine neoplasia Type 1 Diseases 0.000 description 1
- 241001422033 Thestylus Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- CEKJAYFBQARQNG-UHFFFAOYSA-N cadmium zinc Chemical compound [Zn].[Cd] CEKJAYFBQARQNG-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the invention concerns a recording strip or tape having a very thin metal layer applied, for example, by vapour deposition, in which traces are burnt or etched by the passage of an electric current.
- the latter is moved relatively to one or more recording electrodes to which an electric potential is applied and through which passes the recording current.
- layers consisting of tin or alloys of, for example, zinc and cadmium, have proved to be particularly suitable.
- the tape or strip according to the present invention is illustrated diagrammatically in the accompanying sectional drawing.
- the tape or strip comprises a base material 12 on which there is deposited a thin layer of metal 14, though it will be understood that for the sake of clarity the base material and metal are each shown to an arbitrary enlarged scale.
- the present invention is primarily concerned with the metal layer and the base material may be any suitable flexible electrically non- 2,726,179 Patented Dec. 6, 1955 conducting substance conventional in the art, such, for example, as paper or a thermo-plastic.
- the metal layers of the present invention have a very good electric conductance particularly if they are of zinc or contain zinc. Therefore, in contrast to layers of cadmium, little voltage drop occurs as a result of the passage of current between the burning-out point and the point of contact between the metal layer and the contact roller, which should cover as large a surface as possible, and the development of heat is consequently limited to a small area around the burning-out point, whilst the metal layer in the immediate proximity of that point remains cold.
- the efiect of this during the burning-out is that any parts of the metal layer that are melted recede from the electrode or stylus towards the adjacent colder areas, and causes an uneven thickening or" the metal layer along the trace.
- the metal layer consists of an alloy containing substantially of cadmium and substantially 20% of zinc and having a melting point of approximately 270 C., then perfectly neat traces can be readily burnt or etched therein at a temperature which lies approximately 40 C. lower. This is due to the fact that the metal layer is very thin, generally approximately 0.1 and therefore is readily punctured at a temperature which lies below its melting point.
- layers of a cadmiumzinc alloy also have the particular advantage that they possess a high degree of stability and therefore can be stored for a long period without the layers deteriorating.
- an electrically non-conductive recording tape having a thin vapour deposited layer from .02 to .Z in thickness of an alloy of cadmium and zinc containing substantially 80% of cadmium.
- an electrically non-conductive recording medium having a thin vapour deposited layer from .02 to .2,u in thickness of an alloy of cadmium and zinc containing substantially 80% of cadmium and substantially 20% of zinc.
Landscapes
- Photoreceptors In Electrophotography (AREA)
Description
Dec. 6, 1955 A. ORTLIEB ET AL RECORDING TAPES HAVING A METAL LAYER APPLIED BY VAPOUR DEPOSITION Filed Jan. 7, 1952 METAL ALLOY 12 TAPE 7N l/E N TORS W 0%; w 2M MEN 1:, A TTORNEyS United States Patent RECORDING TAPES HAVING A METAL LAYER APPLIED BY VAPOUR DEPGSITION Alfred ()rtlieb, Stuttgart-Vaihingen, and Eberhard Traub, Stuttgart, Germany, assignors to Robert Bosch G. m. b. H., Stuttgart, Germany Application January 7, 1952, Serial No. 265,304
2 Claims. (Cl. 117-227) The invention concerns a recording strip or tape having a very thin metal layer applied, for example, by vapour deposition, in which traces are burnt or etched by the passage of an electric current.
in the known method for burning or etching such tracings into the metal layer of the recording tape, the latter is moved relatively to one or more recording electrodes to which an electric potential is applied and through which passes the recording current. Between each recording electrode and the metal layer, there should be as small a contact surface as possible resulting in a consequently large contact resistance, whilst between the metal layer and a contact roller connected to the source of potential there should, however, be as great a contact surface as possible resulting in a correspondingly small resistance.
When carrying out this process, recording tapes were used having metal layers of zinc or cadmium which were applied by thermal evaporation in a vacuum or by sputtering or similar methods, and measured from 0.02 to 0.2; in thickness. Such metal layers, however, cannot be produced in all cases in such a manner that neat traces are formed even with burning voltages which lie below the minimum arcing voltage. A further disadvantage in the use of zinc or cadmium coatings consists in the fact that they are not sufficiently stable. For this reason it has already been proposed to provide a protective coating on metal coated record tapes after the deposition of the metal layer. On using such recording tapes the electrode or stylus cannot come into direct contact with the metal layer. The burning-out voltage applied must at least be great enough to develop sparks that are capable of puncturing the protective coating.
Electric sparks, however, are in many cases undesirable.
Experiments have shown that one can also obtain good traces at low burning-out voltages, if, according to the present invention, one uses recording tapes or strips having thereon a thin layer of a metal whose melting point lies below that of pure cadmium.
For instance, layers consisting of tin or alloys of, for example, zinc and cadmium, have proved to be particularly suitable.
The tape or strip according to the present invention is illustrated diagrammatically in the accompanying sectional drawing. The tape or strip comprises a base material 12 on which there is deposited a thin layer of metal 14, though it will be understood that for the sake of clarity the base material and metal are each shown to an arbitrary enlarged scale. The present invention is primarily concerned with the metal layer and the base material may be any suitable flexible electrically non- 2,726,179 Patented Dec. 6, 1955 conducting substance conventional in the art, such, for example, as paper or a thermo-plastic.
When using recording tapes with such layers, it is not necessary to produce the trace by means of sparks, because on the one hand, the electrode can slide on the bare metal layer, and on the other hand, the heat produced by the current at the point of contact with the electrode is already sufficient to etch the low melting point metal layer at this point without sparking. Therefore, one can operate with burning-out voltages which lie below the minimum arcing voltage which is approximately 14 volts. Good traces can be burnt in the tape even with a very low voltage of, for example, 6 volts.
The metal layers of the present invention have a very good electric conductance particularly if they are of zinc or contain zinc. Therefore, in contrast to layers of cadmium, little voltage drop occurs as a result of the passage of current between the burning-out point and the point of contact between the metal layer and the contact roller, which should cover as large a surface as possible, and the development of heat is consequently limited to a small area around the burning-out point, whilst the metal layer in the immediate proximity of that point remains cold. The efiect of this during the burning-out is that any parts of the metal layer that are melted recede from the electrode or stylus towards the adjacent colder areas, and causes an uneven thickening or" the metal layer along the trace. On burningout or etching the trace by means of arcing, however, the major portion of the layer substance which is burnt or etched away evaporates, settles on the stylus partially in the form of an oxide deposit and often necessitates constant cleaning of the electrode or stylus.
If, for example, the metal layer consists of an alloy containing substantially of cadmium and substantially 20% of zinc and having a melting point of approximately 270 C., then perfectly neat traces can be readily burnt or etched therein at a temperature which lies approximately 40 C. lower. This is due to the fact that the metal layer is very thin, generally approximately 0.1 and therefore is readily punctured at a temperature which lies below its melting point.
In addition to these advantages, layers of a cadmiumzinc alloy also have the particular advantage that they possess a high degree of stability and therefore can be stored for a long period without the layers deteriorating.
We claim:
1. As a new article of manufacture, an electrically non-conductive recording tape having a thin vapour deposited layer from .02 to .Z in thickness of an alloy of cadmium and zinc containing substantially 80% of cadmium.
2. As a new article of manufacture, an electrically non-conductive recording medium having a thin vapour deposited layer from .02 to .2,u in thickness of an alloy of cadmium and zinc containing substantially 80% of cadmium and substantially 20% of zinc.
References Cited in the file of this patent UNITED STATES PATENTS 2,274,444 Freed Feb. 24, 1942 2,374,214 Kline et al. Apr. 24, 1945 2,382,432 McManus et a1 Aug. 14, 1945 2,554,017 Dalton May 22, 1951
Claims (1)
1. AS A NEW ARTICLE OF MANUFACTURE, AN ELECTRICALLY NON-CONDUCTIVE RECORDING TAPE HAVING A THIN VAPOUR DEPOSITED LAYER FROM .02 TO .2U IN THICKNESS OF AN ALLOY OF CADMIUM AND ZINC CONTAINING SUBSTANTIALLY 80% OF CADMIUM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US265304A US2726179A (en) | 1952-01-07 | 1952-01-07 | Recording tapes having a metal layer applied by vapour deposition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US265304A US2726179A (en) | 1952-01-07 | 1952-01-07 | Recording tapes having a metal layer applied by vapour deposition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2726179A true US2726179A (en) | 1955-12-06 |
Family
ID=23009907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US265304A Expired - Lifetime US2726179A (en) | 1952-01-07 | 1952-01-07 | Recording tapes having a metal layer applied by vapour deposition |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2726179A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2833677A (en) * | 1954-06-09 | 1958-05-06 | Recording paper for spark recorders | |
| US2877145A (en) * | 1956-02-13 | 1959-03-10 | Nat Res Corp | Coating |
| US2884337A (en) * | 1955-06-03 | 1959-04-28 | Ohio Commw Eng Co | Method for making metallized plastic films |
| US2890135A (en) * | 1958-02-19 | 1959-06-09 | Anadite Inc | Vacuum metalizing high tensile steel parts |
| US3047475A (en) * | 1958-09-25 | 1962-07-31 | Burroughs Corp | Method for producing magnetic materials |
| US3317315A (en) * | 1962-04-30 | 1967-05-02 | Rca Corp | Electrostatic printing method and element |
| US3411948A (en) * | 1964-04-08 | 1968-11-19 | Hewlett Packard Co | Electrosensitive recording medium |
| US3414430A (en) * | 1962-09-18 | 1968-12-03 | Gevaert Photo Prod Nv | Magnetic signal storing elements comprising a vacuum-evaporated magnetizable coatingapplied to a non-magnetic supporting member provided with an elastomeric adhesive layer |
| US3665483A (en) * | 1969-06-06 | 1972-05-23 | Chase Manhattan Capital Corp | Laser recording medium |
| US4241356A (en) * | 1976-10-08 | 1980-12-23 | Robert Bosch Gmbh | Recording medium for thermographic recording of data items |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2274444A (en) * | 1940-05-04 | 1942-02-24 | Freed Simon | Lighting fixture |
| US2374214A (en) * | 1939-07-27 | 1945-04-24 | Western Union Telegraph Co | Conductive papers |
| US2382432A (en) * | 1940-08-02 | 1945-08-14 | Crown Cork & Seal Co | Method and apparatus for depositing vaporized metal coatings |
| US2554017A (en) * | 1946-11-14 | 1951-05-22 | Timefax Corp | Electroresponsive recording blank |
-
1952
- 1952-01-07 US US265304A patent/US2726179A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2374214A (en) * | 1939-07-27 | 1945-04-24 | Western Union Telegraph Co | Conductive papers |
| US2274444A (en) * | 1940-05-04 | 1942-02-24 | Freed Simon | Lighting fixture |
| US2382432A (en) * | 1940-08-02 | 1945-08-14 | Crown Cork & Seal Co | Method and apparatus for depositing vaporized metal coatings |
| US2554017A (en) * | 1946-11-14 | 1951-05-22 | Timefax Corp | Electroresponsive recording blank |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2833677A (en) * | 1954-06-09 | 1958-05-06 | Recording paper for spark recorders | |
| US2884337A (en) * | 1955-06-03 | 1959-04-28 | Ohio Commw Eng Co | Method for making metallized plastic films |
| US2877145A (en) * | 1956-02-13 | 1959-03-10 | Nat Res Corp | Coating |
| US2890135A (en) * | 1958-02-19 | 1959-06-09 | Anadite Inc | Vacuum metalizing high tensile steel parts |
| US3047475A (en) * | 1958-09-25 | 1962-07-31 | Burroughs Corp | Method for producing magnetic materials |
| US3317315A (en) * | 1962-04-30 | 1967-05-02 | Rca Corp | Electrostatic printing method and element |
| US3414430A (en) * | 1962-09-18 | 1968-12-03 | Gevaert Photo Prod Nv | Magnetic signal storing elements comprising a vacuum-evaporated magnetizable coatingapplied to a non-magnetic supporting member provided with an elastomeric adhesive layer |
| US3411948A (en) * | 1964-04-08 | 1968-11-19 | Hewlett Packard Co | Electrosensitive recording medium |
| US3665483A (en) * | 1969-06-06 | 1972-05-23 | Chase Manhattan Capital Corp | Laser recording medium |
| US4241356A (en) * | 1976-10-08 | 1980-12-23 | Robert Bosch Gmbh | Recording medium for thermographic recording of data items |
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