ホログラフィの実用化技術について, 実用化の観点からホログラフィの原理, 特徴および種類を簡単に述べた後, ホログラム製作技術および, 実用化例として, バーコードリーダ用ホログラムスキャナとCDプレーヤ用ホログラム光ヘッドを解説する.

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各国の特許制度は種々の点で相違している.その相違点を取り除き, 各国の特許制度をできるだけ均一化することを目的として, 現在, 特許制度のハーモナイゼーション条約を締結しようとする動きがある.本稿は, その条約案の中で特に重要と思われる条項をいくつか取りあげて, ハーモナイゼーションの検討状況を紹介するものである.

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ヘッドホンステレオ, カメラ一体型VTRなどのAV機器は, 近年のエレクトロニクスの進歩により小型化, 軽量化が急速に進んでいる.これらのポータブルAV機器の重要なパーツである各種の電池を紹介するととに, 最近の新電池の開発動向を解説する.

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The synchronized carrier television system utilizes television channels effectively. However, phase fluctuation in the vision carrier reduces the protection ratio against co-channel interference.
This paper investigates the phase fluctuation of a vision carrier. Experiments analyze two elements ; transmitter fluctuation and added fluctuation from radio propagation. It is shown that this additional fluctuation over long distances is very small whenever the path is in the line-of-sight.
This paper also discusses the visibility of phase fluctuations in television ghost images, and points out that these measured fluctuations do not create problems for the planning of a synchronized carrier television system.

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Pupil size changes as a function of the processing load or human activity level required to perform a cognitive task. It may also reflect the situation of retentive processes. This study aims to relate the pupil size to retention by examining the reproduction of 8-digit number patterns. The results show that in the case of a complete correct answer, pupil size gradually increases with the presentation of each digit, and decreases monotonically during reporting. However, if the subject cannot answer at all, it does not change and stays large. Blink time, which can be measured by a sharp drop in pupil size, is very short during presenting and reporting, but many subjects blink after reporting the final digit. However, if the subject forgot the digit presented, blink time is longer.

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This paper presents a 10-channel HDTV digital transmission system using wavelength-division multiplexing. We have developed an external-grating-cavity laser diode, made up into a compact module for a holographic diffraction grating and an aspherical lens, that operates at high speed. The optical multiplexer and demultiplexer have a narrow channel spacing of 1.9 nm, low polarization-sensitivity, and low optical crosstalk. We have also developed a new method of digital frequency-division multiplexing that transmits one HDTV signal at 668.25 Mb/s per optic channel. Transmission experiments through 3 km of GI fiber demonstrate its high performance.

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高精細液晶テレビ用高速駆動法を考案し, 解析した.本駆動法は, 画像信号の垂直方向の相関を利用し, 2ライン前で予備駆動を行うことを特徴としている.本駆動法により, 3000 (H) ×1000 (V) ドットを持つ40インチ高精細液晶テレビの駆動周波数を最低でも22%高速化することができた.

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