Company Filing History:

12 out of 5,451

Yamaha Corporation

1 out of 832,812

Other

patents

Years Active: 1996-2014

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23 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 8854716 - Reflection type variable optical attenuator (2014-10-07),

2. 8289071 - Charge pump (2012-10-16),

3. 8284093 - Successive approximation A/D converter (2012-10-09),

4. 8059834 - Automatic gain control circuit (2011-11-15),

5. 7990211 - Class D amplifier circuit (2011-08-02),

6. 7982522 - Semiconductor integrated circuit for realizing an amplifier having ringing reduction circuitry (2011-07-19),

7. 7948313 - Class D amplifier circuit (2011-05-24),

8. 7924089 - Offset voltage correction circuit and class D amplifier (2011-04-12),

9. 7920082 - D/A converter circuit and digital input class-D amplifier (2011-04-05),

10. 7912112 - Spectrum spreading circuit (2011-03-22),

11. 7830182 - Comparator (2010-11-09),

12. 7816992 - Offset voltage correction circuit and class D amplifier (2010-10-19),

13. 7679435 - Digital input class-D amplifier (2010-03-16),

14. 7336418 - Optical attenuator (2008-02-26),

15. 7006273 - Faraday rotation device and optical device using same (2006-02-28),

Title: Innovations of Hirotaka Kawai: A Luminary in Optical and Electrical Engineering

Introduction

Hirotaka Kawai, an ingenious inventor based in Hamamatsu, Japan, has made significant strides in the field of optical and electrical engineering. With a remarkable portfolio of 23 patents to his name, Kawai's innovations have notably advanced technologies used in optical devices and charge pumps.

Latest Patents

Two of Hirotaka Kawai's latest patents exemplify his exceptional creativity and engineering skills:

1. **Reflection Type Variable Optical Attenuator**: This invention involves a sophisticated arrangement of components, including an input/output port, a birefringent element, a variable polarization rotator, and a reflector, all aligned along an optical axis. The variable polarization rotator is engineered with permanent magnets that apply a fixed magnetic field to a Faraday rotator, ensuring its magnetic saturation while minimizing the strength of the variable magnetic field. The design allows for effective operation at low magnetic fields, employing ferrite permanent magnets and an air-core coil to optimize performance.

2. **Charge Pump**: This innovative charge pump features a unique switching circuit interposed among capacitors and an input power supply, managed by a control unit that regulates its operation modes. It can operate in high-voltage, low-voltage, and relay modes, facilitating efficient transition between these states. The control unit intelligently adjusts the charging voltages in response to operational commands, demonstrating an outstanding blend of functionality and efficiency.

Career Highlights

Throughout his career, Kawai has contributed his expertise to notable firms, including Yamaha Corporation and FDK Corporation. His experience in these esteemed companies has undoubtedly influenced the trajectory of his inventive endeavors, providing him with a rich foundation for his groundbreaking work.

Collaborations

Hirotaka Kawai has collaborated with distinguished colleagues like Nobuaki H. Tsuji and Hiromitsu Umezawa. These partnerships have likely fostered a creative exchange of ideas, further propelling innovation in their respective fields.

Conclusion

Hirotaka Kawai’s profound contributions to the domains of optical and electrical engineering underscore his status as a leading inventor. His patents reflect not only his technical prowess but also a commitment to advancing technology. As he continues to develop cutting-edge solutions, Kawai’s work is sure to remain influential in the years to come.

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