This paper reviews signal and image recorders utilizing scanned and focused laser lights illuminated on recording media. Since this type of recording technique has merits in recording speed, resolution, contrast ratio and grey-scale linearity, it is important for applications in various industrial recording systems. The paper first discusses problems related to laser sources, light modulators, scanners, optics and recording media. It then sketches historical development of this type of recording technique. Finally it gives description of six typical laser recorders appeared in recent years including the newspaper facsimile recording system developed by the authors.
This article gives a review of the studies made in Japan on the smoke particles produced by evaporating metal in inactive gas. Many beautiful habits are found among these particles by electron microscopy since ten years. The relation between the formation conditions and the size, habit and crystal structure are being made clear. A conclusion have been drawn that the coalescence of particles plays an important role besides the ordinary growth in the vapour. Several experiments have been carried out to find the size effect on the electric and magnetic properties of the particles. Particularly, NMR experiments are attracting an interest among Japanese researchers related to Kubo's prediction (J. Phys. Soc. Japan 17 (1962) 975). A suggestion is made for the accurate determination of Fourier coefficients Vh of the static potential of crystal from the refraction effect of an electron beam penetrating through a polyhedral crystal.
The movable tube mass flowmeter here reported consists of two movable tube flowmeters and two constant flow apparatus. This mass flowmeter has such a merit as the mass flow rates can be measured regardless of the viscosity of the fluid to be measured. This merit is very important because a change in density is frequently accompanied with a change in viscosity. The present movable tube mass flowmeter may be classified into two types, namely, with and without a pressure compensator. By the latter, the mass flow rate is calculated from three measured values and by the former, from only one measured value. The experimental results using trial mass flowmeters of both the above mentioned types, agree fairly well with theory.
This paper describes the development of a digital image processor. With this device, the dataprocessed by a large computer (FACOM 230-60) and stored in the magnetic tape can be displayed on the cathode ray tube off-line operation with a com-puter. Some of the characteristics of the image processor are given as follows: (1) Digital scanning plotting is performed with high accuracy (better than ±0.1% of full scale) and high speed (about 1000 points per second), though the beam deflection is con-trolled by the current in the deflection yoke. (2) Brightness modulation is obtained by using the method of pulse width modulation. Owing to this method, various kinds of correction (for example, correction of H-D curve of the film) can be very easily performed. (3) Our device dose not use buffer memories and is characterized by construction simpli-city and low cost. Developed digital image processor can find applications in such fields as digital picture processing, synthesis of computer generated holograms and kinoforms. The two latter applications are given in this paper. The performance of this device is also checked by testing the reconstructed image quality from them.
In this paper the construction of the digital image scanner system developed by the pre-sent authors and its applications are described. Using this device, we can digitize the intensity distribution of an image recorded on transparency, such as photographic films, and then store the information in a large computer (FACOM 230-60) for further operation in the off-line mode. Our device, developed by utilizing parts largely in common with the digital image pro-cessor previously reported, does not use buffer memory and is characterized by its simplicity of construction, low cost and adaptability for studying many digital image processing techniques. The processing speed of our device (about 1000 points per second) and the accuracy of input operation were found satisfactory for practical use. Applications to the reconstruction of optical hologram by the computer and image enhan-cement by computer processing are presented.
This report describes effects of D. C. and A. C. fields on the viscosity of an electroviscous fluid consisting of di-butyl sebacate or di-phenyl chloride with suspended particles of silicagel, cellulose and mica. The effects of particle species, frequencies of field, concentration, moisture and heat-treat-ment of particles are presented. A microscopic observation on the electrophoresis under D. C. and A. C. fields is also given.