Frictionless, non-destructive playback system for cylinder...

Details Frictionless, non-destructive playback system for cylinder... Frictionless, non-destructive playback system for cylinder...

2006-05-09

2006-05-09

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Optical reading of mechanical record

C369S179000

Reexamination Certificate

active

07042811

ABSTRACT:
The present invention provides a laser heterodyne interferometer based system for audibly producing sounds recorded on a cylinder recording, such as an Edison type wax cylinder, or a 33, 45 or 78 RPM LP (long play) record. The system generally comprises an optical system mounted on an optical platform, and an audio recording medium mounted on a platform operatively positioned relative to the optics platform. The optical system comprises an interferometer type structure that uses laser generated light propagated either through free space or through fiber, a platform on which the optical system is mounted, and a platform on which the recording media (e.g., cylinder or record) is mounted.

REFERENCES:
patent: 3794778 (1974-02-01), Smith et al.
patent: 3956597 (1976-05-01), Carrarini
patent: 4633715 (1987-01-01), Monchalin
patent: 5754517 (1998-05-01), Futagawa
patent: 6185179 (2001-02-01), Mohrin

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