US2163087A - Mechanical recording - Google Patents

Mechanical recording Download PDF

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Publication number
US2163087A
US2163087A US144498A US14449837A US2163087A US 2163087 A US2163087 A US 2163087A US 144498 A US144498 A US 144498A US 14449837 A US14449837 A US 14449837A US 2163087 A US2163087 A US 2163087A
Authority
US
United States
Prior art keywords
layer
cutting
recording
band
carrier
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
Application number
US144498A
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English (en)
Inventor
Boer Jan Hendrik De
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of US2163087A publication Critical patent/US2163087A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor

Definitions

  • My invention relates to carriers for mechanically-recorded and optically-reproducible sound tracks, and to a method of making same.
  • the object of my invention is to overcome the above difficulties, and to provide a carrier which has the required cutting properties while at the same time is mechanically strong and relatively inexpensive to manufacture.
  • I start with a band of a saponifiable cellulose derivative, and 30 saponify this band to transform into regenerated cellulose, a surface portion extending to a depth sufflcient for mechanical recording. I then form. either prior or subsequently to the recording, and either on or within the regenerated cellulose, a
  • reproduction as used herein and in the claims is to be understood to include both sound reproduction and the reproduction or 40 copying of the sound track on one or more additional carriers.
  • a carrier l is moved in the direction of the arrow a at a constant speed, while 50 a cutting tool 2 provided with a V-shaped cutting edge having an apical angle a is vibrated in the direction of the double-headed arrow in acoordance with the vibrations of the sounds to be recorded to produce a sound track 4.
  • the'angle a is given a value of about 174, but is which during subsequent treatment with a sulshown much smaller for purposes of illustration. Such recording has been described in detail in the above-mentioned patent.
  • Carrier l with which the present invention is concerned, comprises a cutting-supporting layer 5 8, and a covering layer 5 of opaque material.
  • layer 8 is formed from a band or strip of a saponifiable cellulose derivative, for instance an inorganic or organic ester of cellulose, such as nitrocellulose. I prefer to use acetyl cellulose, as such material is noninflammable, which is of great advantage both during recording and the later projection.
  • portion 6 is of relatively soft material and serves as a cutting layer, whereas portion 1 is relatively hard and serves as a supporting layer. Furthermore, during the recording there is no danger of layers 6 and I becoming detached.
  • I 25 form layer I by starting with a band of acetyl cellulose having a thickness of, for instance, 130 microns. I then superficially saponify this layer, for instance by treating same with a 2 N methyl so alcoholic solution of potassium hydroxide until the thickness of the saponified portion 6 is about 50 microns, after which I wash and dry the layer.
  • the opaque layer 5 which should be very thin, and should be capable of absorbing at least 95% of the light (opacity about 1.4) required for the optical reproduction or copying.
  • Layer 5 may be formed invarious manners
  • a layer of a metal 40 sulphide sol such as mercury sulphide, Berlin blue, or colloidal carbon provided with a protective colloid.
  • Layer 5 may also be chemically formed within portion 6 by soaking layer 8 in a solution of a metal salt, such as a nickel salt.
  • layer 5 may be formed photochemically, for instance by coating the surmy face of portion 6 with a photosensitive diazonium compound'whose light-decomposition product is capable of reducing a metal salt, such as silver salt to silver.
  • a photosensitive diazonium compound'whose light-decomposition product is capable of reducing a metal salt, such as silver salt to silver Particularly good results are obtained when the light-decomposition product of the diazonium compound acts upon a mercurous salt to produce, in or on portion 6, a mercurymetal layer which may be converted into a silver layer by treatment with a silver salt, such as silver nitrate. 'In this Way it is possible to obtain a coating or layer which is highly opaque to the light required for reproduction.
  • a method of making a band-shaped carrier 7 for a mechanically-recorded and optically-reproducible vibration record from a band of a cellulose derivative capable of being saponified comprising the steps of saponifying a portion of said band'to form a cutting layer of regenerated cellulose having a depth sufiicient for mechanical recording, and providing a thin layer of opaque material at the cutting surface of said regenerated cellulose layer.
  • the step of saponifying a surface portion of a band of acetyl cellulose to form a cutting layer of regenerated cellulose In the manufacture of carriers for mechanically-recorded and optically-reproducible vibration records, the step of saponifying a surface portion of a band of acetyl cellulose to form a cutting layer of regenerated cellulose.
  • a method of making a carrier for mechanically-recorded and optically-reproducible vibration records from a band of a saponifiable cellulose derivative comprising the steps of saponifying a portion of said band to form a cutting layer of regenerated cellulose having a depth suflicient for mechanical recording, providing the cutting layer with a layer of a photo-sensitive diazonium compound, exposing the carrier to decompose the diazonium compound, and treating the carrier with a metal salt to produce a metal layer opaque to the light used for reproduction.
  • a method of making an optically-reprofiable cellulose derivative comprising the steps of saponifying part ofthe band to form a surface layer of regenerated cellulose, cutting a V1- bration track into said surface layer to form a sound track having a V-shaped section, and forming an opaque layer at the surface of the cutting layer surrounding the vibration track.
  • a unitary supporting-recording layer having a supporting layer portion of a saponifiable cellulose derivative and a surface layer portion of regenerated cellulose of a thickness sufiicient for mechanical recording.
  • a unitary supporting-recording layer having a supporting layer portion of a saponifiable cellulose derivative and a surface layer portion of regenerated cellulose having a thickness of the order of 50 microns and serving as a recording layer.
  • a mechanically-recorded and optically-reproducible vibration record comprising a unitary supporting-cutting layer having a supporting layer portion of a saponifiable cellulose derivative and a surface layer portion of regenerated cellulose having a thickness of the order of 50 microns and serving as a recording layer, a thin covering layer of opaque material at the surface of the layer portion of regenerated cellulose, and a mechanically-recorded vibration track extending through said covering layer and into said surface layer portion.

Landscapes

  • Duplication Or Marking (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US144498A 1937-02-17 1937-05-24 Mechanical recording Expired - Lifetime US2163087A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1937N0040383 DE700179C (de) 1937-02-17 1937-02-17 Verfahren zur Herstellung eines bandfoermigen Lautschrifttraegers

Publications (1)

Publication Number Publication Date
US2163087A true US2163087A (en) 1939-06-20

Family

ID=7348182

Family Applications (1)

Application Number Title Priority Date Filing Date
US144498A Expired - Lifetime US2163087A (en) 1937-02-17 1937-05-24 Mechanical recording

Country Status (6)

Country Link
US (1) US2163087A (de)
AT (1) AT156919B (de)
CH (1) CH207746A (de)
DE (1) DE700179C (de)
FR (1) FR833728A (de)
GB (1) GB495680A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522078A (en) * 1945-02-03 1950-09-12 Joseph B Walker Translucent recording medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2522078A (en) * 1945-02-03 1950-09-12 Joseph B Walker Translucent recording medium

Also Published As

Publication number Publication date
DE700179C (de) 1940-12-14
AT156919B (de) 1939-09-11
CH207746A (de) 1939-11-30
GB495680A (en) 1938-11-17
FR833728A (fr) 1938-10-28

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