Ruggedized homogeneous thin dielectric film focus sensor

Details Ruggedized homogeneous thin dielectric film focus sensor Ruggedized homogeneous thin dielectric film focus sensor

1992-10-01

1994-07-05

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4411, 369 4423, 2502015, G11B 7135

Patent

active

053274130

ABSTRACT:
A focus detecting device utilizing thin film to detect convergence or divergence of rays from a light source by directing the light rays through a pair of prisms having the same index of refraction but separated from one another along a surface by material having a lesser index of refraction so that both reflection and transmission occur across the surface, the reflection being detected by the first pair of detectors and the transmitted radiation being detected by a second pair of detectors whose outputs will vary in accordance with the collimation of the light.

REFERENCES:
patent: 5200946 (1993-04-01), Fritz
patent: 5245174 (1993-09-01), Prikryl et al.
"Principles of Optical Disk System" by G. Bouwhuis et al. from Philips Research Laboratories, Eindhoven and published by Adam Hilger, Ltd., Bristol and Boston, p. 80.
"A Focus Sensing Method with Improved Pattern Noise Rejection", by D. R. Marshall of the Hewlett Packard Disk Mechanisms Division as published in the S.P.I.E. vol. 1449, Optical Data Storage, 1991 pp. 332-339.
"Frustated Total Internal Reflection and Application of Its Principle to Laser Cavity Design" by Iann Court and Frederick K. von Willisen in the issue of Applied Optics, Jun. 1964, vol. 3, No. 6, pp. 7191.varies.726.
"A Variable Transmittance Beam Splitter" by R. N. Smartt, in the Apr. 1970 issue, vol. 9, No. 4, Applied Optics, pp. 970-971.
"Principles of Optics" by Born and Wolf, 5th ED, Section 1.6, pp. 61-67.
"Principles of Optics" by Born and Wolf, 5th ED 1975, pp. 60-67.

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