Transducer arrangement in recording and/or playback devices utilizing disc records

Claim 2

A transducer arrangement for use in a recording and/or playback device utilizing a disc record which is rotated about its own axis, which comprises a transducer arm, a framework for supporting said transducer arm for axial sliding movement in a diametrical direction of the disc record, means for moving said transducer arm in said diametrical direction, a transducer head for recording and/or reproducing signals on the disc record in contact therewith, elastic means for yieldingly mounting said transducer head on one end of said transducer arm, and adjustment means operatively associated with said elastic means for moving said elastic means into a selected deformed condition for movement of said transducer head into a selected position along a path extending substantially perpendicular to said disc record for adjusting the contact pressure between said transducer head and said disc record.

Claim 3

A transducer arrangement as claimed in claim 1, further comprising means for preventing rotary movement of said transducer arm about its longitudinal axis.

Claim 4

A transducer arrangement as claimed in claim 1, wherein said moving means comprises a motion translator for reversibly translating angular motion into linear motion, said motion translator including a strip having a slot formed therein and an elongated tongue extending from one end of said strip, said tongue being doubled back through said slot to form a loop, the other end of said strip and the free end of said tongue being respectively secured to said transducer arm in spaced relation to each other, a cylindrical body, a motor for rotating said cylindrical body, said cylindrical body being inserted through said loop and secured thereto whereby rotation of said cylindrical body by said motor moves said transducer arm linearly in said diametrical direction.

Claim 5

A transducer arrangement as claimed in claim 3, wherein said motor is a pulse controlled motor.

Claim 6

A transducer arrangement as claimed in claim 1, wherein said elastic means comprises a pair of elastically deformable plate members extending in parallel relation to each other and each having one end connected to said transducer head and the other end connected to said one end of said transducer arm.

Claim 7

A transducer arrangement as claimed in claim 5, wherein said adjustment means comprises an adjustment screw having one end in operative engagement with one of said plate members adjacent to said transducer head for moving said plate members simultaneously into said selected deformed condition.

Claim 8

A transducer arrangement as claimed in claim 5, wherein said adjustment means comprises an adjustment screw supported on said elastic means and having one end in engagement with said transducer arm adjacent said transducer one end for moving said plate members simultaneously into said selected deformed condition.

Claim 9

A transducer arrangement as claimed in claim 5, wherein said adjustment means comprises an adjustment pin having enlarged threaded portions at each end and an intermediate portion of reduced diameter, said transducer arm being provided with a diametrically extending groove in the end face of said arm adjacent said one end for accommodating said pin intermediate portion and means supported on said plate members threadedly engageable with said threaded end portions on said pin for moving said plate members simultaneously into said selected deformed condition.

Claim 10

A transducer arrangement for use in a recording and/or playback device utilizing a disc record which is rotated about its own axis, which comprises: a. a substantially cylindrical transducer arm; b. a framework for supporting said transducer arm for axial sliding movement in a diametrical direction of said disc record; c. a pair of retaining blocks, rigidly mounted on said transducer arm in spaced relation to each other, one of said retaining blocks being positioned adjacent one end of said transducer arm; d. an electrically operated motor having a drive shaft; e. a motion translator for reversibly translating angular motion into linear motion, said motion translator including a strip having a slot formed therein and an elongated tongue extending from one end of said strip, said tongue being doubled back through said slot to form a loop, the other end of said strip and the free end of said tongue being respectively secured to said retaining blocks on said transducer arm, said drive shaft of said motor being inserted through said loop and secured thereto whereby rotation of said drive shaft by said motor moves said transducer arm linearly in said diametrical direction. f. a transducer head for recording and/or reproducing signals on the disc record in contact therewith; g. a spacer block rigidly mounted on said transducer arm adjacent the other end of said transducer arm; h. elastic means for yieldingly mounting said transducer head on said spacer block, said elastic means including a first elastic plate member having one end rigidly connected to said spacer block, a second elastic plate member having one end rigidly connected to said spacer block in spaced relation to said one end of said first elastic plate member, and a connecting plate member hAving both ends rigidly connected to the other ends of said first and second elastic plate members, said first and second elastic plate members extending in substantially parallel relation to each other and to the longitudinal axis of said transducer arm; i. means for rigidly mounting said transducer head on said connecting plate member; and j. adjustment means operatively associated with said first and second elastic plate members for moving said first and second plate members along a path extending substantially perpendicular to the plane of each of said first and second elastic plate members for adjusting the contact pressure between said transducer head and said disc record.

Claim 11

A transducer arrangement for use in a recording and/or playback device utilizing a disc record which is rotated about its own axis, which comprises: a. a substantially cylindrical transducer arm; b. a framework for supporting said transducer arm for axial sliding movement in a diametrical direction of said disc record; c. a pair of retaining blocks, rigidly mounted on said transducer arm in spaced relation to each other, one of said retaining blocks being positioned adjacent one end of said transducer arm; d. an electrically operated motor having a drive shaft; e. a motion translator for reversibly translating angular motion into linear motion, said motion translator including a strip having a slot formed therein and an elongated tongue extending from one end of said strip, said tongue being doubled back through said slot to form a loop, the other end of said strip and the free end of said tongue being respectively secured to said retaining blocks on said transducer arm, said drive shaft of said motor being inserted through said loop and secured thereto whereby rotation of said drive shaft by said motor moves said transducer arm linearly in said diametrical direction. f. a transducer head for recording and/or reproducing signals on the disc record in contact therewith; g. a spacer block rigidly mounted on said transducer arm adjacent the other end of said transducer arm; h. elastic means for yieldingly mounting said transducer head on said spacer block, said elastic means including a first elastic plate member having one end rigidly connected to said spacer block, a second elastic plate member having one end rigidly connected to said spacer block in spaced relation to said one end of said first elastic plate member, and a connecting plate member hAving both ends rigidly connected to the other ends of said first and second elastic plate members, said first and second elastic plate members extending in substantially parallel relation to each other and to the longitudinal axis of said transducer arm; i. means for rigidly mounting said transducer head on said connecting plate member; and j. adjustment means operatively associated with said first and second elastic plate members for moving said first and second plate members along a path extending substantially perpendicular to the plane of each of said first and second elastic plate members for adjusting the contact pressure between said transducer head and said disc record.

Claim 12

A transducer arrangement as claimed in claim 9 further comprising means for preventing rotary movement of said transducer arm about its longitudinal axis.

Claim 13

A transducer arrangement as claimed in claim 9 wherein said motor is a pulse controlled motor.

Claim 14

A transducer arrangement in accordance with claim 9, wherein said adjustment means comprises an adjustment screw having one end in operative engagement with one of said plate members adjacent to said transducer head for moving said plate members simultaneously to adjust said contact pressure.

Claim 15

A transducer arrangement in accordance with claim 9, wherein said adjustment means comprises an adjustment screw supported on said elastic means and having one end in engagement with said transducer arm adjacent said other end for moving said plate members simultaneously to adjust said contact pressure.

Claim 16

A transducer arrangement in accordance with claim 9, wherein said adjustment means comprises an adjustment pin having enlarged threaded portions at each end and an intermediate portion of reduced diameter, said transducer arm being provided with a diametrically extending groove in the end face of said arm adjacent said other end for accommodating said pin intermediate portion and means supported on said plate members threadedly engageable with said threaded end portions on said pin for moving said plate members simultaneously to adjust said contact pressure.

Claim 17

A transducer arrangement as claimed in claim 10, wherein said preventing means comprises a substantially V-shaped spring plate having one end rigidly connected to said framework and the other end rigidly connected to said one retaining block.

Claim 18

A transducer arrangement as claimed in claim 9, wherein said spacer block has a first section rigidly mounted on said other end of said transducer arm and a second section rigidly connected to said first section at right angles to said first section with said one end of said second elastic plate member sandwiched between said first and second sections, the plane of said second section being in substantially parallel relation to the plane of each of said first and second elastic plate members, and wherein said adjustment means comprises an adjustment screw threaded through said second section adjacent said connecting plate member and having one end in operative engagement with said second elastic plate member.

Claim 19

A transducer arrangement as claimed in claim 9, wherein said connecting plate member is formed with a bore of a diameter greater than the diameter of said transducer arm, said other end of said transducer arm loosely extending through said bore and within the clearance space defined by said first and second elastic plate members and wherein said means for mounting said transducer head on said connecting plate member includes a substantially U-shaped spacer block, said U-shaped spacer block having a pair of opposed leg portions and a bite portion integrally formed with said leg portions, the free ends of said respective leg portions being rigidly secured to said connecting plate member, said other end of said transducer arm terminating within a space defined by said connecting plate member, said leg portions and said bite portion, and means for securing said transducer head to the surface of said bite portioN opposite said connecting plate member.

Claim 20

A transducer arrangement as claimed in claim 17, wherein said adjustment means comprises an internally threaded opening in one of said leg portions, an adjustment screw extending through said internally threaded opening in threaded engagement therewith and having one end in engagement with said other end of said transducer arm.

Claim 21

A transducer arrangement as claimed in claim 17, wherein said other end of said transducer arm has an end face facing said bite portion of said U-shaped spacer block, said end face being provided with an outwardly opening groove extending at right angles to the longitudinal axis of said transducer arm and perpendicular to the disc record and wherein said adjustment means comprises a pin member having enlarged portions at each end and an intermediate portion of reduced diameter accommodated within said groove with said enlarged portions disposed on opposite sides of said transducer arm, and wherein at least one of said leg portions of said U-shaped spacer block is provided with an internally threaded opening, and wherein one of said enlarged portions is externally threaded for threaded engagement with said internally threaded opening and an opening in the other leg portion of said U-shaped spacer block for accommodating the other enlarged portion of said pin member.

Claim 22

A transducer arrangement for use in a recording and/or playback device utilizing a disc record which is rotated about its own axis, which comprises: a. a substantially cylindrical transducer arm; b. a framework for supporting said transducer arm for axial sliding movement in a diametrical direction of the disc record; c. a pair of retaining blocks rigidly mounted on said transducer arm in spaced relation to each other, one of said retaining blocks being positioned adjacent one end of said transducer arm; d. a pulse controlled motor having a drive shaft; e. a motion translator for reversibly translating angular motion into linear motion, said motion translator including a strip having a slot formed therein and an elongated tongue extending from one of end said strip, said tongue being doubled back through said slot to form a loop, the other end of said strip and the free end of said tongue being respectively secured to said retaining blocks on said transducer arm, said drive shaft of said motor being inserted through said loop and secured thereto whereby rotation of said drive shaft by said motor moves said transducer arm linearly in said diametrical direction; f. a transducer head for recording and/or reproducing signals on the disc record in contact therewith; g. a spacer block rigidly mounted on said transducer arm adjacent the other end of said transducer arm; and h. elastic means for yielding by mounting said transducer head on said spacer block, said elastic means including a first elastic plate member having one end rigidly connected to said spacer block, a second elastic plate member having one end rigidly connected to said spacer block in spaced relation to said one end of said first elastic plate member, and a connecting plate member having both ends rigidly connected to the other ends of said first and second elastic plate members, said first and second elastic plate members extending in substantially parallel relation to each other and to the longitudinal axis of said transducer arm; and i. means for rigidly mounting said transducer head on said connecting plate member.

Claim 23

A transducer arrangement for use in a recording and/or playback device utilizing a disc record which is rotated about its own axis, which comprises: a. a substantially cylindrical transducer arm; b. a framework for supporting said transducer arm for axial sliding movement in a diametrical direction of the disc record; c. a pair of retaining blocks rigidly mounted on said transducer arm in spaced relation to each other, one of said retaining blocks being positioned adjacent one end of said transducer arm; d. a pulse controlled motor having a drive shaft; e. a motion translator for reversibly translating angular motion into linear motion, said motion translator including a strip having a slot formed therein and an elongated tongue extending from one of end said strip, said tongue being doubled back through said slot to form a loop, the other end of said strip and the free end of said tongue being respectively secured to said retaining blocks on said transducer arm, said drive shaft of said motor being inserted through said loop and secured thereto whereby rotation of said drive shaft by said motor moves said transducer arm linearly in said diametrical direction; f. a transducer head for recording and/or reproducing signals on the disc record in contact therewith; g. a spacer block rigidly mounted on said transducer arm adjacent the other end of said transducer arm; and h. elastic means for yielding by mounting said transducer head on said spacer block, said elastic means including a first elastic plate member having one end rigidly connected to said spacer block, a second elastic plate member having one end rigidly connected to said spacer block in spaced relation to said one end of said first elastic plate member, and a connecting plate member having both ends rigidly connected to the other ends of said first and second elastic plate members, said first and second elastic plate members extending in substantially parallel relation to each other and to the longitudinal axis of said transducer arm; and i. means for rigidly mounting said transducer head on said connecting plate member.