Location History:
- Tokyo, JP (1988 - 1993)
- Oota, JP (1995)
- Kamakura, JP (2003 - 2004)
Company Filing History:
Years Active: 1988-2004
Title: Hiroyuki Haga: Innovator in Optical Disk Technology
Introduction
Hiroyuki Haga is a prominent inventor based in Kamakura, Japan. He has made significant contributions to the field of optical disk technology, holding a total of 5 patents. His work focuses on enhancing the performance and efficiency of optical playback systems.
Latest Patents
Haga's latest patents include a tracking error balance adjustment circuit and a current control circuit used for an optical disk playback apparatus. These innovations aim to improve the reliability and quality of optical disk playback. The tracking error balance adjustment circuit features two separate gain adjusting circuits, each equipped with a variable attenuation circuit. This circuit includes a first gm amplifier of variable gm type and a second gm amplifier connected to the variable attenuation circuit. The output circuit, linked to the second gm amplifier, comprises an operational amplifier circuit with a feedback resistor. Both gm amplifiers are differentially controlled by a common control current. The current control circuit is integrated into a variable gain RF amplifier, which is connected to a head amplifier circuit that amplifies the output signal from the optical pickup. This design allows for the current output of the variable gain RF amplifier to change according to different functions, ensuring that gain control sensitivity remains consistent across varying control voltage inputs.
Career Highlights
Hiroyuki Haga is currently employed at Toshiba Corporation, where he continues to innovate in the field of optical technologies. His work has been instrumental in advancing the capabilities of optical disk systems, making them more efficient and reliable.
Collaborations
Haga has collaborated with notable colleagues, including Ryuichi Yamashita and Shinobu Murai. Their combined expertise has contributed to the development of cutting-edge technologies in the optical disk industry.
Conclusion
Hiroyuki Haga's contributions to optical disk technology through his patents and collaborations highlight his role as a key innovator in the field. His work continues to influence advancements in optical playback systems, ensuring high-quality performance for users.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.