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US 6,151,290 AGranted
Inexpensive safe light beam recorder
AssigneesSony Corporation, Sony Electronics Inc.
InventorEdward W. Morton
Life of this patent
Estimating the term…
Abstract
A light beam optical recorder has a light emitting diode as a light source. Selecting the type of the LED used and the type of a photoresist employed with the selected LED results in creating pits of nearly laser quality. The recorder is substantially cheaper and also offers other advantages over a laser-type recorder.
Claims16
An optical disc light beam recorder comprising:
- a source of a light beam modulated in accordance with information to be recorded, and
- a photosensitive target irradiated by said light beam, whereby pits are formed in said photosensitive target,
- wherein said light beam source includes a non-lasing, light emitting diode, and
- wherein said photosensitive target includes a photoresist relatively insensitive to radiation at about 500 nm and higher.
1 more element
A method of recording data on an optical disc master comprising:
- modulating a non-lasing, light source in accordance with a data stream to be recorded, thereby selectively exposing a photoresist layer on a substrate, wherein said light source emits light over a range of wavelengths centered at a peak-intensity wavelength;
- and
- selecting said photoresist layer in accordance with said range of wavelengths such that said photoresist layer will be relatively insensitive to a first portion of said range of wavelengths and relatively sensitive to a second portion of said range of wavelengths.
An optical disc light beam recorder comprising:
- a light source means modulated to selectively emit light in accordance with information to be recorded, and
- a photosensitive target irradiated by said light source means, whereby pits are formed in said photosensitive target,
- wherein said light source means is a non-lasing, light source means, and
- wherein said photosensitive target includes a photoresist relatively insensitive to radiation at about 500 nm and higher.
1 more element
An optical disc light beam recorder comprising:
- a source of a light beam modulated in accordance with information to be recorded;
- and
- a photosensitive target irradiated by said light beam, whereby pits are formed in said photosensitive target,
- wherein said light beam source includes a non-lasing, light source which emits light over a range of wavelengths centered at a peak-intensity wavelength, and
- wherein said photosensitive target is relatively insensitive to light with a wavelength more than 30 nm above said peak-intensity wavelength.
2 more elements
Dependencies are inferred from the claim text.