Pickup device with a composite compliance arm
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorTadashi Nagaoka
Life of this patent
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Abstract
A pickup device for a video disk for extracting a signal from an information record medium having a high frequency signal recorded thereon in the form of an uneven groove, wherein a scanning body comprising a signal extracting element for producing an electrical signal from the information record medium in accordance with the information therein and a reproducing needle is supported by a plurality of arms each having a lower resonance frequency than the frequency band of the reproduced signals, whereby the reproducing needle is kept in close contact with the information record medium irrespective of the movement of the latter to allow high fidelity reproduction of a wide band high frequency signal.
Claims11
A signal reproducing device for use with a uniformly rigid record medium formed with a guide groove having an uneven pattern formed on at least the bottom thereof with projections of the signal segment being located at intervals corresponding to a modulated recorded signal having a predetermined frequency band, said device comprising:
- a base,
- a pickup member for engaging said record medium, and
- a composite compliance arm having at least three arm sections, one of said arm sections being supported at one end by said base and another of said arm sections having said pickup member secured thereto, each of said arm sections having a resonant frequency which is lower than the lowest frequency in said predetermined frequency band, the mechanical impedance of said composite compliance arm being less than the impedance which causes said pickup member to jump out of engagement with said signal recording medium when a predetermined pressure is applied thereto.
Dependencies are inferred from the claim text.