Location History:
- Osaka, JP (1994)
- Moriguchi, JP (1995)
- Ohta, JP (1997)
- Gunma, JP (1997 - 2001)
- Ota, JP (2001)
Company Filing History:
9 out of 8,776 
2 out of 3 
1 out of 1 Years Active: 1994-2001
Title: The Innovations of Toshio Harada
Introduction
Toshio Harada is a notable inventor based in Ota, Japan. He has made significant contributions to the field of optical disk technology, holding a total of 9 patents. His work has advanced the way information is recorded and reproduced on various optical media.
Latest Patents
One of Harada's latest patents is an optical disk recording/reproduction apparatus designed for recording and reproducing information from optical disks of different standards. This apparatus includes a semiconductor laser and an objective lens positioned opposite the optical disk. It features an optical system that directs a laser beam from the semiconductor laser to the objective lens. Additionally, it has an aperture that allows for the reproduction of data from a digital video disk while intercepting the outermost portion of the laser beam when reproducing from a compact disk. The tracking servo mechanism enables the objective lens to move in a direction orthogonal to the track of the optical disk.
Another significant patent is an apparatus for discriminating optical recording media of varying thicknesses. This device includes an optical pickup with an objective lens that has an effective numerical aperture ranging from 0.55 to 0.65. It can reproduce information from both CDs and SDs. The apparatus effectively discriminates between different types of optical disks by detecting focus error signals during focus servo control, allowing for quick and simple differentiation based on substrate thickness, track pitch, minimum pit lengths, and reflectivity.
Career Highlights
Throughout his career, Toshio Harada has worked with prominent companies, including Sanyo Electric Co., Ltd. His innovative contributions have played a crucial role in the development of optical disk technology.
Collaborations
Harada has collaborated with notable individuals in the field, including Fumio Tatezono and Masahiro Irie. Their combined expertise has furthered advancements in optical media technology.
Conclusion
Toshio Harada's work in optical disk technology has led to significant innovations that enhance the recording and reproduction of information. His patents reflect a deep understanding of optical systems and their applications, making him a key figure in this technological domain.
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.