GB561708A - Improvements in sound records - Google Patents

Improvements in sound records

Info

Publication number
GB561708A
GB561708A GB1671542A GB1671542A GB561708A GB 561708 A GB561708 A GB 561708A GB 1671542 A GB1671542 A GB 1671542A GB 1671542 A GB1671542 A GB 1671542A GB 561708 A GB561708 A GB 561708A
Authority
GB
United Kingdom
Prior art keywords
recording layer
sound records
disc
sound
upstanding
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
GB1671542A
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.)
HANNAMS IND Ltd
Original Assignee
HANNAMS IND Ltd
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 HANNAMS IND Ltd filed Critical HANNAMS IND Ltd
Priority to GB1671542A priority Critical patent/GB561708A/en
Publication of GB561708A publication Critical patent/GB561708A/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
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

561,708. Sound records. COOKE, F. G., and HAMMANS INDUSTRIES, Ltd. Nov. 25, 1942, No. 16715. [Class 40 (ii)] A sound record disc a of board bonded with synthetic resin is made with a relatively deep flat-surfaced annular depression d coated with a recording layer f, e.g. of cellulose acetate, leaving an upstanding rim e and an upstanding central portion c in which the central hole b is made. The edges g of the annular recess may be undercut as shown. Such an annular depression with a recording layer may be made on both sides of the disc, as shown in Fig. 2, or on one side only.
GB1671542A 1942-11-25 1942-11-25 Improvements in sound records Expired GB561708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1671542A GB561708A (en) 1942-11-25 1942-11-25 Improvements in sound records

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1671542A GB561708A (en) 1942-11-25 1942-11-25 Improvements in sound records

Publications (1)

Publication Number Publication Date
GB561708A true GB561708A (en) 1944-06-01

Family

ID=10082344

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1671542A Expired GB561708A (en) 1942-11-25 1942-11-25 Improvements in sound records

Country Status (1)

Country Link
GB (1) GB561708A (en)

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