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For the Inventor, By the Inventor

Kanagawa, Japan

Katsuaki Tsurushima

This inventor holds 20 USPTO granted patents, primarily in Optical Disc Technology. Top assignee: Sony Corporation. Active years: 1976-2003.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsuaki Tsurushima. Retrieved from https://idiyas.com/inventor/katsuaki-tsurushima

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 20

% Patents Active = 100.0

Average Co-Inventor Count = 1.5

ph-index = 12

Forward Citations = 361(Granted Patents)


Location History:

  • Kawasaki, JA (1976 - 1977)
  • Tokyo, JP (1984)
  • Kawasaki, JP (1984 - 1985)
  • Kanagawa, JP (1992 - 2003)

Company Filing History:

goldMedal20 out of 58,147 
 
Sony Corporation
 patents

Years Active: 1976-2003

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Areas of Expertise:
Image Projection
Optical Disc
Recording Apparatus
Disc Cleaning
Data Storage
Optical Player
Lens Assembly
Transistor Amplifier
Bias Circuit
Oscillator Circuit
Variable Gain Control
Disc Protecting Cover
20 patents (USPTO):Explore Patents
1. 6575581 - Image projection method and image projector (2003-06-10),
2. 5859834 - Optical disc with magnetic member in a recessed portion thereof and (1999-01-12),
3. 5666347 - Optical disk and disk chucking mechanism (1997-09-09),
4. 5537387 - Information storage disk with display data recorded in a lead-in region (1996-07-16),
5. 5521900 - Disk having a lead-in region containing display data and an apparatus (1996-05-28),
6. 5467332 - Disc cleaning device (1995-11-14),
7. 5345433 - Optical disc recording apparatus and optical disc reproducing apparatus (1994-09-06),
8. 5317553 - Optical disc recording and/or reproducing apparatus having a buffer (1994-05-31),
9. 5299186 - Disc protecting cover (1994-03-29),
10. 5244705 - Disc-shaped recording medium (1993-09-14),
11. 5148418 - Disc recording apparatus (1992-09-15),
12. 4519058 - Optical disc player (1985-05-21),
13. 4482988 - Objective lens mount and drive for optical disc player (1984-11-13),
14. 4473274 - Objective lens assembly for optical disc player (1984-09-25),
15. 4031482 - Bias circuit for FET (1977-06-21),

Title: **Katsuaki Tsurushima: Innovator in Image Projection and Optical Disc Technology**

Introduction

Katsuaki Tsurushima, based in Kanagawa, Japan, is an accomplished inventor with a remarkable portfolio of 20 patents. His work primarily focuses on cutting-edge technologies that enhance image projection and optical disc functionalities. Tsurushima's contributions to Sony Corporation have been pivotal in advancing these sectors.

Latest Patents

Two of Tsurushima's latest innovations include an **Image projection method and image projector** and an **Optical disc with magnetic member in a recessed portion thereof**. The image projection method is designed to project laser beams while promptly shutting down the beams when an obstacle is detected within the projection area. This innovative system utilizes a detection wave projected alongside the laser beams to identify intrusions effectively.

His second significant patent describes an optical disc that features a disc base plate made of a light-transmitting synthetic material. This design incorporates a recess for mounting a magnetic plate and a holding element that maintains the disc's integrity against thermal expansion discrepancies, thereby preserving the recording and reproducing qualities of the disc.

Career Highlights

Tsurushima has spent a significant portion of his career at Sony Corporation, where his innovations have led to significant advancements in imaging technology. His work has not only been recognized within the company but also across the global technological community, as he continuously strives to push the boundaries of what is possible in his field.

Collaborations

Throughout his career, Tsurushima has collaborated with notable colleagues, including Tadao Yoshida and Ryo Ando. These collaborations have fostered a creative environment that enhances innovation and expands the horizons of their technological pursuits.

Conclusion

Katsuaki Tsurushima's contributions to image projection and optical disc technology underline the importance of continual innovation in today's rapidly evolving technological landscape. With a solid foundation of patents and collaborative efforts, Tsurushima remains a key figure in developing solutions that address modern challenges while paving the way for future advancements.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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