Murata’s tubular ceramic capacitor was used for temperature compensation in those radios. Its dielectric material was titanium oxide. The electrode material was brushed on the surface. Its capacitance was 500 pF.
The piezoelectric resonator for the fish finder had the Langevin structure, where a piezoelectric disc type resonator made with barium titanate was sandwiched between two thick steel plates. It provided good response underwater up to a depth of 90 m.
Murata commercialized AM radio ceramic filters, using lead zirconium titanate, an excellent piezoelectric material. It took 10 more years for this product to penetrate the market, however.
A PTC thermistor was used in the degaussing circuits of color TVs. When the switch is turned on, a strong surge of electric current activates degaussing, directly followed by self-generation of heat, limiting the current flow.
Ceramic filters were also improved by having higher frequency and integration, and became a hit.
When it was first developed, the main component of a mobile phone, the cavity resonance filter, filled up the trunk of a car. After GIGAFIL® was developed, the size of mobile phones was considerably reduced.
As PCs gain popularity, Murata’s CERALOCK®, ceramic resonator to determine a PC’s processing speed, and noise suppression component, ferrite beads, became big hits.
Chip monolithic ceramic capacitors became the mainstream, as surface mounted devices (SMD) on the substrate of equipment with downsizing demand, such as mobile audio equipment and video cameras.
Murata’s active filter for audio equipment removes folding noise inherent in PCM audio. It became indispensable for digital-age music.
Image stabilization function with piezoelectric vibrating gyroscope became essential in filming equipment.
To offer smaller size and more functions for mobile phones, it was essential to have compact handling of radio frequencies. This is where Murata’s GIGAFIL® plays a significant part.