Yoshihiko Noro

Magnetic and Crystallographical Characteristics of the Sendust Films formed by DC Opposite Sputtering Method

Sendust films were formed using DC opposite sputtering equipment. Then, sputtering conditions that influcne the magnetic and crystallographical characteristics of the films were studied. Sendust films with a low coercive force ( 1000 at 6 MHz) are formed under the conditions of high sputtering gas pressures and high substrate temperatures. As the deposition rate increases, a higher substrate temperature is necessary to form films with low coercive forces. Superlattice formation and large columnar crystallites are found in the films formed at high sputtering gas pressures and high substrate temperatures; they decrease the coercive forces of the films.

High C/N Recording in Sb2Se3/Bi Write-Once Disk

The read-out signal in an alloying disk, which has a large phase difference of the reflection coefficient between nonrecorded and recorded states, was analyzed by taking into account the effects of grooves. It was found that the read-out signal can be enhanced by interference between light reflected from a groove and recording media. A 60-dB CN (carrier-to-noise) ratio was obtained by applying this idea to the Sb2Se3/Bi alloying disk. NTSC (National Television System Committee) direct FM signal recording was confirmed by using this disk. It can be read by a modified Laser Disc player system.

A New Concept of Handy Video Recording Camera

High density recording technology is going to realize the very compact VCR system. And all solid state color video camera which has many advantages over conventioal tube type cameras, e. g. light-weight, low power consumption, high reliability, lag elimination and high picture quality, has been developed.1) The authors have developed a handy video recording camera-the MAG CAMERA, which is shown in Fig. 1. This camera features two newly developed technologies; high density two hour recording system and all solid state color camera with single-chip MOS imager. The combination of above two technologies realized the unprecedented performance with compactness and handiness comparable to 8 mm movie cameras.

New Color TV Receiver With SAW IF Filter

It is always our old and new subject that we must kill two birds, performance improvement and cost reduction, with one stone.

Zoom Lens Systems with Aspherical Plastic Lens

Light-weight zoom lens systems with aspherical lens elements, zoom ratio of 6, for a camcorder have been developed by applying new optical design and high precision plastic solding technology.

New Color Television Receiver with Saw if Filter and One-Chip PIf IC

For many television engineers, it has long been a dream to develop an all solid-state TV PIF circuit which does not require adjustments on the assembly lines, by replacing a conventional LC filter with a SAW filter. There are several reasons why this dream has not yet been realized — the immature level of technology and insufficient cost effectiveness of SAW devices. But, the most dominant reason was that the TV manufacturers could find no advantages except in cost reduction and labor saving.

Design of phase shifters for a group type unidirectional transducer based on interaction analysis

A group-type unidirectional transducer (GUT) is useful for a low-loss surface acoustic wave (SAW) filter. The multiport network expressions for the GUT are presented, and interaction between the inphase and quadrature electrodes is studied analytically. The conditions for perfect unidirectivity are described. The design procedures of the phase shifters realizing perfect unidirectivity are shown both in series and parallel configurations for any geometrical phase except pi .<<ETX>>

Huge hyperfine magnetic field of 61Ni in spinel chromites Cu0.9Ni0.1Cr2O4 and Co0.9Ni0.1Cr2O4

By means of 61Ni Mossbauer measurements, the hyperfine magnetic field Hhf of 61Ni2+ ions in the compressed (ca < 1) tetrahedral sites of the spinel chromite Cu0.9Ni0.1Cr2O4 was found to be 800 kOe, which is the largest ever reported for 61Ni. The large Hhf can be elucidated on the basis of the orbital angular momentum in the degenerate ground state of Ni2+ ions.

Precise Aspherical Plastic Lens for Electronic Appliances — Molding Technology and Applications —

We have successfully developed precise and mass-productive molding processes for plastic lenses of home-use electronic appliances such as camcorder (video camera combined with portable VCR) and projection TV, These have already been applied to our plastic lens production. Tens of thousands of plastic lenses are being molded in every month at our works.

Formation of Sendust Films by DC Opposite Sputtering Method

Sendust films were prepared using DC opposite sputtering equipment. Films with a low coercive force of 0.5 Oe and an initial permeability of 1300 at 6 MHz can be prepared at a deposition rate of 5.5 µm/h without annealing of the films after the deposition. The way in which sputtering conditions influence the coercive force of the films was also investigated.