Kozo Kurashina

Title: Innovations of Kozo Kurashina

Introduction

Kozo Kurashina is a notable inventor based in Yahata, Japan. He has made significant contributions to the field of video technology, holding three patents that showcase his innovative spirit and technical expertise.

Latest Patents

One of his latest patents is a video tape recorder immune to third-order distortion noise. This portable video tape recorder for broadcasting applications features a pair of video heads mounted diametrically opposite each other on the circumference of a rotary cylinder. High and low frequency carriers are modulated by frequency modulators with I and Q signals, respectively, and frequency division multiplexed for application to the video heads. The frequency values of the carriers are selected to ensure that third-order distortion noise caused by the hysteresis characteristics of the video heads and the magnetic tape falls within a frequency range differing from the frequencies of the modulated carriers. This design prevents the occurrence of beat interference in the frequency band of the reproduced video signal.

Another significant patent by Kurashina is a video tape recorder with an inter-channel switching circuit for special applications. In this device, luminance and chrominance signals are recorded respectively by first and second transducer heads along separate tracks skewed to the direction of tape motion. The transducer heads are rotated during specific modes, such as slow-motion or still picture reproduction, in a tape-head speed relationship different from the normal. This causes the transducer heads to traverse several tracks, and a switching circuit is coupled to the transducer heads to selectively connect the outputs of the heads to an output circuit. This innovative feature cancels unwanted signal components detected by the heads during traversal across the tracks.

Career Highlights

Kozo Kurashina has worked at Matsushita Electric Industrial Co., Ltd., where he has been able to apply his inventive skills in developing advanced video technologies. His work has contributed to the evolution of video recording and playback systems, enhancing the quality and reliability of these devices.

Collaborations

Throughout his career, Kurashina has collaborated with notable coworkers such as Katsuhiko Yamamoto and Chojuro Yamamitsu. These collaborations have likely fostered an environment of innovation and creativity, leading to the development of groundbreaking technologies in the video industry.

Conclusion

Kozo Kurashina's contributions to video technology through his patents demonstrate his innovative mindset and technical prowess. His work continues to