Detector circuit for capacitance disc records

Details Detector circuit for capacitance disc records Detector circuit for capacitance disc records

1983-02-14

1985-12-10

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369129, G11B 906

Patent

active

045584427

ABSTRACT:
A capacitance detector for detecting the information recorded in the form of a series of microscopic pits on a capacitance disc record. The detector comprises, within an outer conductor, a dielectric support, an oscillator having a first line conductor on the support for generating microwave energy, a coaxial resonator having a second line conductor on the dielectric support, the second line conductor being coupled to the electrode of a capacitance detection stylus. Means are provided for inductively coupling the microwave energy from the oscillator to the resonator. This coupling means comprises a loop having a first section inductively coupled with said first line conductor and a second section inductively coupled with said second line conductor, and a capacitor connected from an intermediate point between the first and second sections to ground, so that the microwave energy coupled to the second line conductor is modulated in amplitude with capacitance variations corresponding to the microscopic pits. An amplitude demodulator is provided for demodulating the amplitude-modulated energy to derive a signal representing the capacitance variation on the record.

REFERENCES:
patent: 2548211 (1951-04-01), Frantz
patent: 3872240 (1975-03-01), Carlson et al.
patent: 4080625 (1978-03-01), Kamamoto et al.
patent: 4459691 (1984-07-01), Yamada

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