GB673450A - Improvements in or relating to apparatus for reproducing from gramophone record discs - Google Patents

Improvements in or relating to apparatus for reproducing from gramophone record discs

Info

Publication number
GB673450A
GB673450A GB1019350A GB1019350A GB673450A GB 673450 A GB673450 A GB 673450A GB 1019350 A GB1019350 A GB 1019350A GB 1019350 A GB1019350 A GB 1019350A GB 673450 A GB673450 A GB 673450A
Authority
GB
United Kingdom
Prior art keywords
spindle
arm
scale
mirror
indicate
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
GB1019350A
Inventor
Cyril John Francis Tweed
Brian Frederick Davies
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB1019350A priority Critical patent/GB673450A/en
Publication of GB673450A publication Critical patent/GB673450A/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
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/08—Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/06—Determining or indicating positions of head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/02—Arrangements of heads
    • G11B3/10—Arranging, supporting, or driving of heads or of transducers relatively to record carriers
    • G11B3/12—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse
    • G11B3/14—Supporting in balanced, counterbalanced or loaded operative position during transducing, e.g. loading in direction of traverse by using effects of gravity or inertia, e.g. counterweight

Abstract

673,450. Gramophones. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Dec. 13, 1950. [April 25, 1950] No. 10193/50. Class 40 (ii). In a sound reproducing apparatus having a transducer carried by an arm 1 mounted on a vertically movable spindle 2, a friction clutch member 8 is mounted on the spindle and co-operates with another clutch member 9 which can be rotated by an adjustment arm 11, the spindle 2 being raised or lowered by vertical force transmitted through the clutch members. The arm 11 is provided with a part 13 projecting through a slot 14 in the cover board M of the apparatus so that it can be manually adjusted. To indicate the position of the arm 1 one or more mirrors 15 are mounted on the spindle 2 to reflect a point of light on to an indicator scale. If the scale is too short to indicate the full range with one mirror, several mirrors are used. The spots of light from each mirror are arranged to traverse the scale in succession.
GB1019350A 1950-04-25 1950-04-25 Improvements in or relating to apparatus for reproducing from gramophone record discs Expired GB673450A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1019350A GB673450A (en) 1950-04-25 1950-04-25 Improvements in or relating to apparatus for reproducing from gramophone record discs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1019350A GB673450A (en) 1950-04-25 1950-04-25 Improvements in or relating to apparatus for reproducing from gramophone record discs

Publications (1)

Publication Number Publication Date
GB673450A true GB673450A (en) 1952-06-04

Family

ID=9963274

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1019350A Expired GB673450A (en) 1950-04-25 1950-04-25 Improvements in or relating to apparatus for reproducing from gramophone record discs

Country Status (1)

Country Link
GB (1) GB673450A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2348112A1 (en) * 1973-09-25 1975-04-17 Assmann Gmbh Record player pick-up arm resetting device - has swivelling rod with tilting device whose actuation carries pick-up arm and pressure plate away from record

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2348112A1 (en) * 1973-09-25 1975-04-17 Assmann Gmbh Record player pick-up arm resetting device - has swivelling rod with tilting device whose actuation carries pick-up arm and pressure plate away from record

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