Company Filing History:

9 out of 42,508

Hitachi, Ltd.

Sega Enterprises, Ltd.

patents

where one patent can have more than one assignee

Years Active: 1990-2019

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12 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 10199967 - Motor controller, motor driving apparatus, motor driving system, image forming apparatus, and conveying device (2019-02-05),

2. 9925798 - Optical scanning apparatus and image forming device (2018-03-27),

3. 9625711 - Optical scanning apparatus and image forming device (2017-04-18),

4. 5513037 - Rear-projection screen and a rear projection image display employing the (1996-04-30),

5. 5500747 - Ultra-wide angle liquid crystal projector system (1996-03-19),

6. 5485308 - Rear-projection type image display apparatus and rear-projection type (1996-01-16),

7. 5400114 - Rear-projection screen and a rear projection image display employing the (1995-03-21),

8. 5272540 - Temperature compensating lens system for projection television (1993-12-21),

9. 5255122 - Projection lens system for projection type television (1993-10-19),

10. 5200814 - Video projector with optical color balance (1993-04-06),

11. 5066099 - Rear projection screen and method of producing the same (1991-11-19),

12. 4948237 - Projection lens system (1990-08-14),

Title: Masayuki Muranaka: Innovator in Motor Control and Optical Scanning Technologies

Introduction

Masayuki Muranaka is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the fields of motor control and optical scanning technologies. With a total of 12 patents to his name, Muranaka's work has had a substantial impact on various industries.

Latest Patents

Muranaka's latest patents include a motor controller, motor driving apparatus, motor driving system, image forming apparatus, and conveying device. The motor controller is designed to control a motor using a first control method based on a first current command value and a second control method based on a second current command value. This innovative controller features an analog-to-digital converter that generates the second current command value based on an externally input reference signal. Additionally, it includes a current limit generator that establishes an upper limit value for the first current command value based on the second current command value. Another notable patent is the optical scanning apparatus, which consists of a light source, an optical deflector with a rotary polygon mirror, and a scanning optical system that focuses the light beam on a target surface. This apparatus also incorporates a sync detecting sensor to determine the write start timing on the target surface, along with a processing unit that corrects detection data based on the measured time needed for one revolution of the rotary polygon mirror.

Career Highlights

Throughout his career, Muranaka has worked with leading companies such as Hitachi, Ltd. and Ricoh Company, Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas, contributing to advancements in technology.

Collaborations

Muranaka has collaborated with notable coworkers, including Hiroki Yoshikawa and Isao Yoshizaki. Their combined expertise has fostered a creative environment that has led to the development of groundbreaking technologies.

Conclusion

Masayuki Muranaka's contributions to motor control and optical scanning technologies highlight his role as a key innovator in the field. His patents and collaborations reflect a commitment to advancing technology and improving efficiency in various applications.

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