Apparatus for electromechanical recording of short wavelength modulation in a metal master
US4035590A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1976 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Mar 22, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/16
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An unheated cutting stylus is positioned with respect to a metal master in order to cut a groove having a quiescent groove depth less than one micrometer while relative motion is established between the cutting stylus and the metal master. The cutting stylus is vibrated about the quiescent position thereof in response to a relatively high frequency signal while cutting the groove in order to cut an information track comprising short wavelength modulation (e.g., 0.6 to 1.6 micrometers) of groove depth in the bottom of the groove having a peak-to-peak dimension less than the quiescent groove depth. The cutting stylus vibration is effected by a piezoelectric element which is mounted directly between a pedestal and the cutting stylus by means of bonding materials. The pedestal, the piezoelectric element, and the cutting stylus are shaped to form a cutterhead structure having all external surfaces disposed in anti-parallel relationship to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.