How James Russell Invented the Digital Optical Disc
A 1966 invention that replaced physical needles on vinyl records with a laser beam reading digital data from a spinning disc.
Original patent title: “Analog to digital to optical photographic recording and playback system”
A 1966 invention that replaced physical needles on vinyl records with a laser beam reading digital data from a spinning disc. Granted to Battelle Development Corp in 1970 with 52 forward citations, and it is now in the public domain.
Key facts
Coverage
What does this patent actually cover?
This patent describes a system that converts analog audio signals into digital data and encodes them onto a light-sensitive photographic disc. During playback, a light source scans the disc, and a detector converts the reflected light pulses back into an electrical signal. This process eliminates the physical contact between a needle and a record, preventing the wear and tear that degrades sound quality over time. By using digital encoding, the system ensures that the audio signal can be perfectly reconstructed without the noise or distortion inherent in analog playback.
The gap
What does this patent NOT cover?
- Does not cover magnetic tape recording or playback systems.
- Does not cover the specific error-correction algorithms used in later commercial CDs.
- Does not cover non-optical storage media like hard disk drives.
- Does not cover the physical manufacturing process of mass-producing consumer CDs.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
What made this novel
Russell realized that by using a light beam to read data, he could eliminate physical friction, allowing for infinite playback cycles without degrading the source material.
The Patent Drawing
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Compact Disc (CD) players
LaserDisc players
DVD and Blu-ray optical drives
Why it matters
The bigger picture
This technology is the direct ancestor of the Compact Disc (CD), DVD, and Blu-ray. It fundamentally shifted the music and data storage industries from analog, mechanical systems to digital, optical systems, enabling the high-fidelity audio and mass data distribution that defined the late 20th century.
Filed
September 1, 1966
Granted
March 17, 1970
Market context
Who's building on this
Companies in this space
Companies like Sony and Philips eventually refined and commercialized this concept into the CD standard. Today, while optical storage is declining in favor of flash memory and cloud storage, the core principles of digital optical scanning remain a foundation for high-density data archival.
Market impact
The invention triggered a total transition in the music industry, moving from vinyl and cassette tapes to the digital CD format. It also created the foundation for the optical storage market, which dominated data distribution for decades before the rise of streaming services.
Claim 1 — Plain English
What this patent covers
This patent describes a system that converts analog audio signals into digital data and encodes them onto a light-sensitive photographic disc. During playback, a light source scans the disc, and a detector converts the reflected light pulses back into an electrical signal. This process eliminates the physical contact between a needle and a record, preventing the wear and tear that degrades sound quality over time. By using digital encoding, the system ensures that the audio signal can be perfectly reconstructed without the noise or distortion inherent in analog playback.
The clever bit
Russell realized that by using a light beam to read data, he could eliminate physical friction, allowing for infinite playback cycles without degrading the source material.
What it does not cover
- Does not cover magnetic tape recording or playback systems.
- Does not cover the specific error-correction algorithms used in later commercial CDs.
- Does not cover non-optical storage media like hard disk drives.
- Does not cover the physical manufacturing process of mass-producing consumer CDs.
Patent Journey
From filing to expiry
PatentBrief Score
Impact Score
Early stage
Citation count
34/40
Highly cited
Claim breadth
0/20
Narrow claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$32K – $104K
Midpoint $65K · expired or expiring · industry ×1.5
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Concepts involved
Citations
Patent lineage
Cite this patent
Russell, J. T. (1970). How James Russell Invented the Digital Optical Disc (U.S. Patent No. 3,501,586). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/3501586/optical-digital-recording-russell
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does How James Russell Invented the Digital Optical Disc cover?
A 1966 invention that replaced physical needles on vinyl records with a laser beam reading digital data from a spinning disc.
Who owns patent US 3501586?
Battelle Development Corp owns this patent, granted in 1970.
When does this patent expire?
This patent has expired and is now in the public domain — anyone can use the invention freely.
What is patent US 3501586 cited by?
This patent has been cited by 52 later patents that build on its ideas.
What problem does this patent solve?
This technology is the direct ancestor of the Compact Disc (CD), DVD, and Blu-ray. It fundamentally shifted the music and data storage industries from analog, mechanical systems to digital, optical systems, enabling the high-fidelity audio and mass data distribution that defined the late 20th century.
What does this patent NOT cover?
Does not cover magnetic tape recording or playback systems.
Patent monitoring