Company Filing History:
3 out of 3,781 
2 out of 21,351 
Years Active: 2002-2006
Title: Keiichiro Wakamiya: Innovator in Semiconductor Technology
Introduction
Keiichiro Wakamiya is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 5 patents. His innovative designs and solutions have advanced the capabilities of semiconductor devices, making them more efficient and reliable.
Latest Patents
Wakamiya's latest patents include an improved semiconductor device featuring a chip-scale package (CSP). This device incorporates posts on the electrode pads of a semiconductor chip, with solder balls serving as external terminals after encapsulation with resin. This design effectively prevents cracks caused by stress from differences in the coefficient of linear expansion between the semiconductor chip and the sealing resin. To alleviate stress on the posts, a stress-absorbing layer made from a low Young's modulus metal, such as gold (Au) or palladium (Pd), is interposed within each post.
Another notable patent describes a semiconductor device that includes a semiconductor chip and a circuit substrate positioned to face the chip. The circuit substrate is electrically connected to the semiconductor chip through a connection conductor. This arrangement features a pad electrode on the semiconductor chip and a terminal electrode on the circuit substrate. A conductive dummy pattern is formed on one of the facing surfaces, and the space between them is filled with nonconductive resin. This design ensures uniform temperature distribution, reducing ultrasonic wave attenuation.
Career Highlights
Throughout his career, Keiichiro Wakamiya has worked with leading companies in the technology sector, including Renesas Technology Corporation and Mitsubishi Electric Corporation. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking advancements in semiconductor technology.
Collaborations
Wakamiya has collaborated with notable colleagues such as Toshihiro Iwasaki and Michitaka Kimura. Their combined expertise has fostered innovation and development in their respective fields.
Conclusion
Keiichiro Wakamiya's contributions to semiconductor technology through his patents and collaborations highlight his role as a key innovator in the industry. His work continues to influence the development of more efficient and reliable semiconductor devices.