GB815147A - Improvements in or relating to magnetic recording sheets - Google Patents

Improvements in or relating to magnetic recording sheets

Info

Publication number
GB815147A
GB815147A GB32999/57A GB3299957A GB815147A GB 815147 A GB815147 A GB 815147A GB 32999/57 A GB32999/57 A GB 32999/57A GB 3299957 A GB3299957 A GB 3299957A GB 815147 A GB815147 A GB 815147A
Authority
GB
United Kingdom
Prior art keywords
sheet
duplicating
master sheet
magnetic
cylinder
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
Application number
GB32999/57A
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.)
TDK Corp
Original Assignee
TDK Corp
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 TDK Corp filed Critical TDK Corp
Publication of GB815147A publication Critical patent/GB815147A/en
Expired legal-status Critical Current

Links

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
    • G11B5/004—Recording on, or reproducing or erasing from, magnetic drums

Landscapes

  • Manufacturing Of Magnetic Record Carriers (AREA)

Abstract

815,147. Duplicating magnetic records. TOKYO DENKI KAGAKU KOGYO KABUSHIKI KAISHA, and IIOSHINO, Y. Oct. 22, 1957 [Oct. 23, 1956; Dec. 26, 1956], No. 32999/57. Class 40 (2). Apparatus for duplicating magnetic recording sheets from a master sheet, comprising locating means for positioning the master sheet relative to a recording machine, and means for forming a second locating means in the duplicating sheet in accordance with the location of the master sheet. In the embodiment described with reference to Figs. 4 and 5, a master sheet M is located on a base plate 10 with its magnetic coated side uppermost. A duplicating sheet P, having a magnetic coated area somewhat larger than that of the master sheet M is placed face downwards on the master sheet beneath a pressure plate 11. Punching means 12, 12<SP>1</SP> perforate both sheets identically prior, or after, the printing operation which consists of applying a magnetic field through the sheets. The field may be alternating or direct of sufficient density to effect printing and is then decreased to zero. A modification of this apparatus is shown in Fig. 6 in which guide members 13 locate the duplicating sheet. A method is shown in Fig. 8 by which means duplication is carried out on a cylinder 15. During printing the cylinder is rotated by a pressure roller 16, and stationary electromagnets 18, 18<SP>1</SP> within the cylinder 15 and roller 16, respectively, ensure a concentrated field at the point of contact.
GB32999/57A 1956-10-23 1957-10-22 Improvements in or relating to magnetic recording sheets Expired GB815147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP815147X 1956-10-23

Publications (1)

Publication Number Publication Date
GB815147A true GB815147A (en) 1959-06-17

Family

ID=13748440

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32999/57A Expired GB815147A (en) 1956-10-23 1957-10-22 Improvements in or relating to magnetic recording sheets

Country Status (1)

Country Link
GB (1) GB815147A (en)

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