This inventor holds 9 USPTO granted patents. Top assignee: Sanyo Electric Co., Ltd.. Active years: 1986-2000.
Location History:
- Osaka, JP (1986 - 1996)
- Moriguchi, JP (1995 - 1997)
- Kawachinagano, JP (1997 - 1999)
- Osaka-fu, JP (1998 - 2000)
Company Filing History:
Years Active: 1986-2000
Title: Keiichi Yodoshi: Innovator in Optical Technology
Introduction
Keiichi Yodoshi is a prominent inventor based in Moriguchi, Japan. He has made significant contributions to the field of optical technology, holding a total of 9 patents. His work primarily focuses on optical pickup devices and semiconductor laser technology.
Latest Patents
One of Yodoshi's latest patents is an optical pickup device. This device includes a substrate with a semiconductor laser that emits a laser beam. It features a reflection-type diffraction grating that splits the laser beam into at least three beams and reflects them upward. A hologram receives these beams, and an objective lens converges them onto an optical recording medium. The three beams reflected from the optical recording medium are then focused by the hologram and directed onto a photodetector.
Another notable patent is for a semiconductor laser device and its manufacturing method. This device consists of an n-type cladding layer, an active layer, and a p-type cladding layer with a ridge portion. The optical confinement layer is formed on the flat portion and side surfaces of the ridge portion, composed of a low resistivity layer doped with n-type impurity. This layer has a smaller refractive index than the p-type cladding layer and a bandgap energy greater than the energy of lasing light.
Career Highlights
Keiichi Yodoshi has been instrumental in advancing optical technologies through his innovative designs and patents. His work at Sanyo Electric Co., Ltd. has positioned him as a key figure in the industry. His inventions have paved the way for improvements in optical devices, enhancing their efficiency and performance.
Collaborations
Yodoshi has collaborated with notable coworkers, including Akira Ibaraki and Masayuki Shono. Their combined expertise has contributed to the successful development of various optical technologies.
Conclusion
Keiichi Yodoshi's contributions to optical technology through his patents and collaborations highlight his role as a leading inventor in the field. His innovative work continues to influence advancements in optical devices and semiconductor lasers.