This inventor holds 3 USPTO granted patents. Top assignee: Hochiki Corporation. Active years: 1976-1987.
Location History:
- Kawasaki, JA (1976)
- Kawasaki, JP (1978)
- Machida, JP (1987)
Company Filing History:
Years Active: 1976-1987
Title: Innovations by Shigeru Kajii in Smoke Detection Technology
Introduction
Shigeru Kajii is a notable inventor based in Kawasaki, Japan. He has made significant contributions to the field of smoke detection technology, holding a total of 3 patents. His work focuses on enhancing the efficiency and reliability of smoke detectors, which are crucial for safety in various environments.
Latest Patents
One of Kajii's latest innovations is a smoke detector with a changeable pulse light emitting interval. This device comprises a light emitting section that radiates pulse light to a detection area at predetermined intervals. The light receiving section, positioned opposite the light emitting section, detects changes in the detection area by measuring variations in the photo-output level. This design includes a monitor terminal that outputs a monitor signal corresponding to the photo-output level. When connected to a measuring apparatus, the supervision period is significantly shortened, allowing for real-time monitoring and facilitating adjustments.
Another significant patent is for a storage type smoke detector. This device requires a specific time delay after an ionization smoke sensor detects a fire before issuing a warning. It features a charging circuit with a capacitor connected to the power supply line, coupled with a discharging circuit that periodically discharges the voltage stored in the capacitor. The discharging circuit is controlled by a P-channel type field effect transistor, which is connected to the output of the ionization smoke sensor and receives a series of oscillating pulses.
Career Highlights
Shigeru Kajii is currently associated with Hochiki Corporation, a company known for its advanced fire detection and alarm systems. His work at Hochiki has allowed him to focus on developing innovative solutions that enhance safety and efficiency in smoke detection.
Collaborations
Throughout his career, Kajii has collaborated with talented individuals such as Hiroshi Honma and Junichi Narumiya. These collaborations have contributed to the advancement of technology in the field of smoke detection.
Conclusion
Shigeru Kajii's contributions to smoke detection technology through his innovative patents demonstrate his commitment to enhancing safety measures. His work continues to influence the industry and improve the effectiveness of smoke detectors.