Resumes
Resumes
Fred Spong Phones & Addresses
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733 Diamond St, Williamsport, PA 17701
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723 High St, Williamsport, PA 17701
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Philadelphia, PA
Publications
Us Patents
Optical Record Playback Apparatus Employing Light Frequency At Which Alternate Regions Of Record Track Exhibit Anti-Reflection Condition
View pageUS Patent:
42198488, Aug 26, 1980
Filed:
Oct 31, 1977
Appl. No.:
5/847462
Inventors:
Fred W. Spong - Lawrenceville NJ
Assignee:
RCA Corporation - New York NY
International Classification:
H04N 576
G11B 700
G11B 700
US Classification:
3581285
Abstract:
For playback of a disc record information track, in which regions of a light reflective surface overlaid with a layer of light absorptive material alternate with regions of said light reflective surface free of said overlying absorptive material, light of a constant intensity is focused on the information track as the disc is rotated. The focused light is of insufficient intensity to effect ablation of the remaining absorptive material, but is of a frequency at which the overlaid regions of the coated disc exhibit an anti-reflection condition. A photodetector, positioned to receive light reflected from the information track as the pits pass through the path of the focused light, develops a signal representative of the recorded information.
Capacitance Distance Sensor Apparatus For Video Disc Player/Recorder
View pageUS Patent:
41830601, Jan 8, 1980
Filed:
Sep 14, 1978
Appl. No.:
5/942183
Inventors:
William E. Barnette - Levittown PA
Fred W. Spong - Lawrenceville NJ
Fred W. Spong - Lawrenceville NJ
Assignee:
RCA Corporation - New York NY
International Classification:
H04N 576
G11B 2120
G11B 1732
G11B 2120
G11B 1732
US Classification:
358128
Abstract:
A non-contact type, capacitance distance sensing probe having one or two electrodes disposed about one end of an objective lens system in an optical video disc system is used with a focus control servo loop to maintain focus of a light beam on the surface of a reflective disc record despite undesirable axial displacements of the surface when the record is rotated. The two electrode probe is balanced to provide immunity to variations in the impedance of the external circuit which grounds the disc.
Recording Methods For A Multilayer Optical Record
View pageUS Patent:
41908430, Feb 26, 1980
Filed:
Oct 28, 1977
Appl. No.:
5/846667
Inventors:
Fred W. Spong - Lawrenceville NJ
Assignee:
RCA Corporation - New York NY
International Classification:
G01D 900
G01D 1510
G01D 1524
G01D 1510
G01D 1524
US Classification:
346 11
Abstract:
A flat major surface of a disc-shaped substrate (e. g. , of glass) is coated with a light-reflective layer (e. g. , of aluminum). Overlying the reflective layer is a layer of material (e. g. , fluorescein) which is highly absorptive for light of a frequency supplied by a recording laser. The coating parameters are chosen to establish an anti-reflection condition for the coated record blank at the recording light frequency. The light output of the laser, which is intensity modulated in accordance with a signal to be recorded, is focused upon the coated surface of the disc as the disc is rotated. With the peak intensity of the focused light sufficient to cause ablation of the absorptive layer, an information track is formed as a succession of spaced pits in which the reflecting layer is effectively exposed. For playback, light of a constant intensity is focused on the information track as the disc is rotated. The focused light is of insufficient intensity to effect ablation of the remaining absorptive material, but is of a frequency at which the undisturbed regions of the coated disc exhibit an anti-reflection condition.
Multilayer Optical Record
View pageUS Patent:
40978958, Jun 27, 1978
Filed:
Mar 19, 1976
Appl. No.:
5/668495
Inventors:
Fred William Spong - Lawrenceville NJ
Assignee:
RCA Corporation - New York NY
International Classification:
H04N 576
G11B 724
G01D 1534
G11B 724
G01D 1534
US Classification:
358128
Abstract:
A flat major surface of a disc-shaped substrate (e. g. , of glass) is coated with a light-reflective layer (e. g. , of aluminum). Overlying the reflective layer is a layer of material (e. g. , fluorescein) which is highly absorptive for light of a frequency supplied by a recording laser. The coating parameters are chosen to establish an anti-reflection condition for the coated record blank at the recording light frequency. The light output of the laser, which is intensity modulated in accordance with a signal to be recorded, is focused upon the coated surface of the disc as the disc is rotated. With the peak intensity of the focused light sufficient to cause ablation of the absorptive layer, an information track is formed as a succession of spaced pits in which the reflecting layer is effectively exposed. For playback, light of a constant intensity is focused on the information track as the disc is rotated. The focused light is of insufficient intensity to effect ablation of the remaining absorptive material, but is of a frequency at which the undisturbed regions of the coated disc exhibit an anti-reflection condition.
Multilayer Record Blank For Use In Optical Recording
View pageUS Patent:
43050816, Dec 8, 1981
Filed:
Nov 1, 1977
Appl. No.:
5/847640
Inventors:
Fred W. Spong - Lawrenceville NJ
Assignee:
RCA Corporation - New York NY
International Classification:
G01D 1534
US Classification:
3461351
Abstract:
A flat major surface of a disc-shaped substrate (e. g. , of glass) is coated with a light-reflective layer (e. g. , of aluminum). Overlying the reflective layer is a layer of material (e. g. , fluorescein) which is highly absorptive for light of a frequency supplied by a recording laser. The coating parameters are chosen to establish an anit-reflection condition for the coated record blank at the recording light frequency. The light output of the laser, which is intensity modulated in accordance with a signal to be recorded, is focused upon the coated surface of the disc as the disc is rotated. With the peak intensity of the focused light sufficient to cause ablation of the absorptive layer, an information track is formed as a succession of spaced pits in which the reflecting layer is effectively exposed. For playback, light of a constant intensity is focused on the information track as the disc is rotated. The focused light is of insufficient intensity to effect ablation of the remaining absorptive material, but is of a frequency at which the undisturbed regions of the coated disc exhibit an anti-reflection condition.