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For the Inventor, By the Inventor

Sakado, Japan

Yasumasa Tomori

This inventor holds 15 USPTO granted patents. Top assignee: Asahi Kogaku Kogyo Kabushiki Kaisha. Active years: 1981-1989.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yasumasa Tomori. Retrieved from https://idiyas.com/inventor/yasumasa-tomori

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

USPTO Granted Patents = 15

% Patents Active = 100.0

Average Co-Inventor Count = 1.3

ph-index = 10

Forward Citations = 226(Granted Patents)


Location History:

  • Sakada, JP (1982)
  • Sakadoshi, JP (1985)
  • Sakado, JP (1981 - 1986)
  • Tokyo, JP (1985 - 1989)

Company Filing History:

goldMedal15 out of 3,132 
 
Asahi Kogaku Kogyo Kabushiki Kaisha
 patents

Years Active: 1981-1989

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15 patents (USPTO):Explore Patents
1. 4822153 - One-hand zoom lens barrel (1989-04-18),
2. 4627691 - Cam grooves for displacing lenses (1986-12-09),
3. 4589750 - Adapter for connecting single-lens reflex camera lens to video camera (1986-05-20),
4. 4523815 - Zoom lens barrel for macrofocusing (1985-06-18),
5. 4518239 - Intermediate adapter for camera (1985-05-21),
6. 4443085 - Camera with an interchangeable lens (1984-04-17),
7. 4429973 - Compensation for diaphragm control for SLR camera (1984-02-07),
8. 4416526 - Interchangeable lens barrel (1983-11-22),
9. 4413893 - Interchangeable lens barrel (1983-11-08),
10. 4400075 - Automatic focus camera with interchangeable lens (1983-08-23),
11. 4359276 - Interchangeable lens barrel (1982-11-16),
12. 4333712 - Change-over device for zoom lens (1982-06-08),
13. 4324457 - Macro photographic change-over device for zoom lens barrel (1982-04-13),
14. 4309077 - Lens barrel capable of automatic and manual focalizing operations (1982-01-05),
15. 4304463 - Lens barrel automatic focalization device (1981-12-08),

Title: Yasumasa Tomori: Innovator in Optical Technology

Introduction

Yasumasa Tomori is a prominent inventor based in Sakado, Japan. He has made significant contributions to the field of optical technology, holding a total of 15 patents. His innovative designs have advanced the functionality and efficiency of optical systems.

Latest Patents

One of Tomori's latest patents is the one-hand zoom lens barrel. This invention allows zooming by moving both the front and rear lenses, while focusing is achieved by moving only the front lens. The design features a sliding ring that, when moved linearly for zooming, rotates a cam sleeve. A pin in the cam sleeve engages a cam groove in a moving frame for the front lens, enabling its linear movement. Additionally, another cam groove in the cam sleeve engages a pin in the frame for the rear lens, allowing it to move linearly as well. Focusing is accomplished through the threaded rotation of the frame for the front lens on the moving frame.

Another notable patent involves cam grooves for displacing lenses in an optical system. This invention allows lenses or lens groups to be displaced parallel to the optical axis by a lens-operating ring mounted on a support barrel. The cam grooves are designed to optimize the maximum lengths of displacement of vari-focal lenses, ensuring precise adjustments across the entire range of varying focal lengths.

Career Highlights

Yasumasa Tomori is currently employed at Asahi Kogaku Kogyo Kabushiki Kaisha, where he continues to innovate in the field of optics. His work has been instrumental in developing advanced optical technologies that enhance imaging capabilities.

Collaborations

Tomori has collaborated with notable coworkers, including Mituhiko Shimoda and Fumio Urano. Their combined expertise has contributed to the success of various projects and patents in the optical technology sector.

Conclusion

Yasumasa Tomori's contributions to optical technology through his innovative patents have significantly impacted the industry. His work exemplifies the spirit of invention and the pursuit of excellence in optical design.

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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