Katsumi Ishii

This inventor holds 14 USPTO granted patents, primarily in Optical Disc Technology. Top assignees: Pioneer Corporation, Pioneer Electronic Corporation. Active years: 1997-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsumi Ishii. Retrieved from https://idiyas.com/inventor/katsumi-ishii-497d7spn

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

Calculating rank

USPTO Granted Patents = 14

% Patents Active = 71.4

Average Co-Inventor Count = 3.4

ph-index = 4

Forward Citations = 48(Granted Patents)

Location History:

Saitama, JP (2002)
Tokorozawa, JP (1997 - 2007)

Company Filing History:

Pioneer Electronic Corporation

patents

Years Active: 1997-2007

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Areas of Expertise:

Lens Drive Device

Optical Disc Player

Disc Driving Apparatus

Elastic Members

PLL Circuit

Manufacturing Method

Lens Holder

Spring Constants

Reproducing Information

Parallel Objective Lenses

Zigzag Pattern

Guide Devices

14 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 7219358 - Lens drive device having metal wire-like elastic members, and method for manufacturing the same (2007-05-15),

2. 6880159 - Disc driving apparatus (2005-04-12),

3. 6741543 - Lens driving apparatus (2004-05-25),

4. 6625105 - Pickup apparatus and method of manufacturing the same (2003-09-23),

5. 6594223 - Lens driving apparatus for disk player having a lens holder supported by a plurality of elastic members having different spring constants (2003-07-15),

6. 6493158 - Lens driving apparatus for optical disc player and printed circuit board coils for lens driving apparatus for disc player (2002-12-10),

7. 6462893 - Lens driving apparatus for disk player (2002-10-08),

8. 6262964 - Disc player with objective lens arranged in a zigzag pattern (2001-07-17),

9. 5953308 - Disc player with alternating ascending/descending guide devices (1999-09-14),

10. 5848049 - Disc player with parallel objective lenses (1998-12-08),

11. 5677904 - Disc player (1997-10-14),

12. 5671201 - Pulling-in circuit for PLL circuit, pulling-in method for PLL circuit, (1997-09-23),

13. 5646921 - Method and apparatus for reproducing information recorded on CLV disc (1997-07-08),

14. 5619484 - Pulling-in circuit for PLL circuit, pulling-in method for PLL circuit, (1997-04-08),

Title: Innovations of Katsumi Ishii

Introduction

Katsumi Ishii is a notable inventor based in Tokorozawa, Japan. He has made significant contributions to the field of lens drive devices and disc driving apparatuses. With a total of 14 patents, his work showcases a blend of creativity and engineering expertise.

Latest Patents

One of his latest patents is a lens drive device that incorporates metal wire-like elastic members. This innovative device features a lens holder that forms a moving unit, with connection wires for multiple drive coils being integrally molded. The actuator unit includes four wire-form elastic members made of metal, which are molded together with the lens holder and actuator base. Additionally, the device includes a suspension base with yokes that fix magnets in a predetermined magnetic space. Another significant patent is for a disc driving apparatus, which consists of a turntable, a clamping member, and a cam mechanism. This apparatus allows for the magnetic holding of a disc on the turntable, with a cam mechanism that facilitates the movement of the turntable and clamping member.

Career Highlights

Katsumi Ishii has worked with prominent companies such as Pioneer Corporation and Pioneer Electronic Corporation. His experience in these organizations has contributed to his development as an inventor and has allowed him to refine his innovative ideas.

Collaborations

Throughout his career, Katsumi has collaborated with talented individuals, including Hiroshi Yokota and Ryuichi Naito. These collaborations have likely enriched his work and led to the development of groundbreaking technologies.

Conclusion

Katsumi Ishii's contributions to the field of inventions, particularly in lens drive devices and disc driving apparatuses, highlight his innovative spirit and technical prowess. His patents reflect a commitment to advancing technology and improving user experiences.

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]