Company Filing History:
Years Active: 1990-2025
Title: Yasumasa Kashima: Innovator in Photo Detection Technology
Introduction
Yasumasa Kashima is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of photo detection devices and semiconductor image sensors. With a total of 13 patents to his name, Kashima's work has advanced the technology used in various applications.
Latest Patents
One of his latest patents is a photo detection device designed to provide a cost-effective solution compared to traditional InGaAs devices. This device features a single photon avalanche diode (SPAD) that minimizes afterpulsing and reduces dark count rate (DCR). The device comprises a P-type silicon substrate, a P-type germanium layer formed by epitaxial growth, and a P-type thin film silicon layer divided by a Shallow Trench Isolation (STI). Additionally, multiple SPADs are arranged in an array, with a CMOS transistor circuit driving them.
Another notable patent is a semiconductor image sensor that includes a light receiving element formed in a silicon substrate under an insulation film. This sensor is sensitive to near-infrared light and features a pn junction diode oriented vertically to the main surface of the silicon substrate. It also includes a high voltage generating circuit to apply a reverse bias voltage to the pn junction diode.
Career Highlights
Kashima has worked with several notable companies, including Oki Electric Industry Co., Ltd. and Optohub Co., Ltd. His experience in these organizations has contributed to his expertise in developing innovative technologies in the field of photo detection.
Collaborations
Throughout his career, Yasumasa Kashima has collaborated with esteemed colleagues such as Tsutomu Munakata and Masao Kobayashi. These partnerships have fostered a collaborative environment that has led to significant advancements in their respective fields.
Conclusion
Yasumasa Kashima's contributions to photo detection technology and semiconductor image sensors have established him as a leading inventor in his field. His innovative patents and collaborations continue to influence advancements in technology.
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.