Hisao Iizuka

This inventor holds 5 USPTO granted patents. Top assignees: Hitachi Cable, Inc., Hitachi, Ltd.. Active years: 1986-1992.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hisao Iizuka. Retrieved from https://idiyas.com/inventor/hisao-iizuka

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

USPTO Granted Patents = 5

% Patents Active = 100.0

Average Co-Inventor Count = 3.2

ph-index = 5

Forward Citations = 127(Granted Patents)

Location History:

Ibaraki, JP (1989 - 1990)
Hitachi, JP (1986 - 1992)

Company Filing History:

where one patent can have more than one assignee

Years Active: 1986-1992

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5 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5138310 - Light-emitting element array driver circuit (1992-08-11),

2. 4967192 - Light-emitting element array driver circuit (1990-10-30),

3. 4905021 - Optical printer head with a light emitting diode array (1990-02-27),

4. 4829321 - Optical printer head with a light emitting diode array (1989-05-09),

5. 4584470 - Single-polarization fiber optics magnetic sensor (1986-04-22),

Title: Hisao Iizuka: Innovator in Light-Emitting Technology

Introduction

Hisao Iizuka is a notable inventor based in Hitachi, Japan. He has made significant contributions to the field of light-emitting technology, holding a total of 5 patents. His work primarily focuses on driver circuits for light-emitting diode (LED) arrays, which are essential components in electronic photograph printers.

Latest Patents

One of Hisao Iizuka's latest patents is a driver IC for a light-emitting diode array head designed for electronic photograph printers. This innovative driver circuit includes a current mirror circuit with a reference element and at least one output element. It produces a reference current using a digital signal as input. The circuit features a reference current source capable of outputting multiple reference current values, along with a selection circuit that specifies and selects one of these values to be applied as input to the current mirror circuit. Additionally, an output control circuit manages the on and off states of the output current supplied to the output element, based on an externally supplied light emission control signal. This design allows for multi-stage control of the driver output current, facilitating the correction of fluctuations in light emission power over time.

Career Highlights

Throughout his career, Hisao Iizuka has worked with prominent companies such as Hitachi Cable, Inc. and Hitachi, Ltd. His experience in these organizations has contributed to his expertise in developing advanced technologies in the field of light-emitting devices.

Collaborations

Hisao Iizuka has collaborated with notable colleagues, including Kiyohiko Tanno and Norihiro Ashizuka. These partnerships have likely enhanced his innovative capabilities and contributed to the successful development of his patents.

Conclusion

Hisao Iizuka's contributions to light-emitting technology through his patents and collaborations highlight his role as a significant inventor in this field. His work continues to influence advancements in electronic photograph printing and LED technology.

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]