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For the Inventor, By the Inventor

Gifu, Japan

Seiji Kajiyama

This inventor holds 29 USPTO granted patents, primarily in Optical Pickup Devices. Top assignee: Sanyo Electric Co., Ltd.. Active years: 1997-2011.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Seiji Kajiyama. Retrieved from https://idiyas.com/inventor/seiji-kajiyama

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

USPTO Granted Patents = 29

% Patents Active = 72.4

Average Co-Inventor Count = 3.5

ph-index = 9

Forward Citations = 254(Granted Patents)


Location History:

  • Ibi-gun, JP (1997 - 2004)
  • Gifu, JP (1999 - 2011)

Company Filing History:

goldMedal29 out of 8,782 
 
Sanyo Electric Co., Ltd.
 patents

Years Active: 1997-2011

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Areas of Expertise:
Optical Pickup Device
Semiconductor Laser Apparatus
Magneto-Optical Disk
Wavelength Selective Diffraction
Optical Recording Disc
Signal Reproduction
Optical Disk Standards
Light Beam Diameter Control
Optical Head
Recording/Reproducing Apparatus
Optical Media Discrimination
29 patents (USPTO):Explore Patents
1. 7903507 - Optical pickup device and method of laying out the same (2011-03-08),
2. 7782735 - Optical pickup device capable of handling a plurality of laser light beams having different wavelengths (2010-08-24),
3. 7609606 - Optical pickup device (2009-10-27),
4. 7558184 - Optical pickup device (2009-07-07),
5. 7525897 - Optical pickup device (2009-04-28),
6. 7420894 - Optical pickup device (2008-09-02),
7. 7376166 - Semiconductor laser apparatus and optical pickup apparatus (2008-05-20),
8. 7209415 - Optical pickup device and recording and/or reproducing device (2007-04-24),
9. 6693856 - MAGNETO-OPTICAL DISK APPARATUS CAPABLE OF ACCURATE REPRODUCTION OF SIGNAL BY REMOVING MAGNETIC INFLUENCE BY MAGNET INCLUDED IN OPTICAL HEAD AND METHOD OF DETECTING INTENSITY OF MAGNETIC FIELD APPLIED BY MAGNET (2004-02-17),
10. 6574182 - Optical pickup compatible with a plurality of types of optical disks having different thicknesses (2003-06-03),
11. 6552990 - Optical head for two different disk thicknesses with a light beam diameter control device (2003-04-22),
12. 6438097 - Optical recording disc capable of preventing illegal copy (2002-08-20),
13. 6321028 - Optical disk recording/reproduction apparatus for recording/reproducing information to/from optical disk of different standards (2001-11-20),
14. 6262967 - Optical recording disc capable of preventing illegal copy (2001-07-17),
15. 6201777 - Apparatus for discriminating optical recording media of different thicknesses from each other and reproducing information therefrom (2001-03-13),

Title: Seiji Kajiyama: Pioneer in Optical Technologies

Introduction

Seiji Kajiyama, based in Gifu, Japan, is a remarkable inventor recognized for his contributions to optical technology. With an impressive portfolio of 29 patents, he has significantly advanced the field of optical pickup devices. His innovative work is influential in enhancing the performance and capabilities of optical systems.

Latest Patents

Kajiyama's latest patents delve into cutting-edge optical technologies. One notable invention is an optical pickup device and method of laying out the same. This device incorporates precise angles formed by a straight line connecting the center of an optical disk with the accessing position of an HD objective lens, allowing for superior tracking and performance. Another groundbreaking patent focuses on an optical pickup device capable of handling multiple laser light beams of different wavelengths. This device utilizes semiconductor lasers with three elements and employs diffracting action to align the output of various wavelengths seamlessly.

Career Highlights

Seiji Kajiyama currently works at Sanyo Electric Co., Ltd., a company renowned for its commitment to innovation and technology in the consumer electronics sector. His expertise in optical technologies has positioned him as a leading figure within the company, contributing essential patents that drive the industry forward.

Collaborations

Throughout his career, Kajiyama has collaborated with esteemed colleagues such as Yoichi Tsuchiya and Yasuyuki Kanou. These partnerships have fostered an environment of creativity and collaboration, leading to the development of sophisticated technologies in the optical domain.

Conclusion

Seiji Kajiyama's work continues to make a significant impact in the realm of optical technologies. His patents not only highlight his inventive genius but also underline his commitment to advancing the capabilities of optical systems. As he continues to innovate within Sanyo Electric Co., Ltd., the future holds even more promise for the integration of his inventions in everyday technologies.

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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