[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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Two-wire helix 1 : 1 transformers are often used to reverse the polarity of short pulses or to drive push-pull amplifiers by single-ended generators.
This type of transformers are also used in balanced detection. Therefore it is desirable that their available bandwidth be as broard as possible.
The transmission of signal through a transformer is considered as a combination of the balanced and the unbalanced transmissions. And, since any transformer has a finite winding length, the end effect in the balanced transmission and the resonance in the unbalanced transmission have to be taken into consideration. These phenomena deteriorate the higher frequency responses of the transformer.
The authors thought out the following two methods in order to construct trans-formers free from these deteriorations, 1) Winding the paired wire on a bobbin having a groove angle of 30°-45°. 2) Setting a disc screen at each end of the windings on a cylindrical bobbin.
It is confirmed by the measurement of insertion loss and phase vs. frequency characteristics that the 1 : 1 transformer having a bandwidth of several hundred megahertz can be realized using cylindrical as well as troidal structures.

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For the purpose of producing the black matrix picture tubes having the matrix apertures smaller than those of the shadow mask, a photolithographic optical method involving the control of exposure conditions and without affecting the shadow mask apertures is developed.
It is pointed out that the use of a reciprocity-law-failing photoresist whose photosensitivity decreases rapidly with the decrease of light intensity is indispensable to avoid the deformation of the black matrix holes caused by the overlapping of the projected images formed by the photographic exposures.
After studying various systems composed of water-soluble polymers and bisazides, a system showing a significant property of reciprocity-law-failure is found and a suitable condition for the optical method is attained.

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Three-dimensional displays can be classified into binocular displays and autostereoscopic displays. The latter give us more natural depth sensation, but the recording of the autostereoscopic information is technically more difficult and expensive.
In this paper, techniques for synthesizing an autostereoscopic image from binocular ones are presented. Intermediate-viewing-angle images are first synthesized from binocular pictures by linear interpolation between “corresponding points” upon those pictures. The autostereoscopic spatial image is then obtained by integrating many intermediate-viewing-angle images.
An optical setup for performing the interpolation all at once is proposed, and experiments are performed for line drawings and ordinary half-tone pictures.
In a simple setup, ghost often appear due to the erroneous picking up of the “corresponding points”. To reduce the probability of the ghost image generation, “local correlation schemes” have been devised. Computer simulation of the local correlation schemes are also performed.
Synthesized intermediate-viewing-angle images produced both optically and digitally give fairly good depth sensation when observed through appropriate binocular stereoscopic viewers. A real-time display of the intermediate-viewing-angle image on a TV monitor is also demonstrated.

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[in Japanese]

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[in Japanese]

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