It is preferrable in halftone reproduction to use either dither or dot pattern method when a gradation representation is required with a laser beam printer based on electrophotography. In this case, it is important to consider relationship between parameters of electrophotography and a threshold matrix type for binalization.
We tried to evaluate a characteristics of the halftone reproduction comparing two of different threshold matrix types ; Fattening type and Bayer type, on the basis of both experimental data and computer simulation data.
We have made a model for a computer simulation to derive surface voltage and toner distribution using following assumptions : effective optical spot diameter and spacial average of optical toner density.
As a result, we have got a good agreement between the experimental data and the simulation data. Our conclusion is that a Fattening type dither matrix is better in its linearity than Bayer type one. Moreover, Fattening type matrix is stable against laser power fluctuation in either the case of reversal toner development or that of ordinary.

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The relaxation mechanism of phase transition type liquid crystal display system was proposed. In case of low applied electric field where the solution was isotropic, its relaxation is simply due to the rotational relaxation of individual molecules. On the other hand, in case of high applied electric field where the phase transition take place, the relaxation is attributed to the simultaneous progress of the rotational relaxation and the thermal destruction of the liquid crystal domains. This mechanism was examined successfully for PBLG solution using the transient current methods.

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In order to realize a simple, inexpensive, and relatively maintenance free pictorial printer, we have developed printing sheets for dye transfer. These printing sheets of which bases are made of inexpensive polyethylene terephthalate (PET) film can be used for high speed thermal printing systems.
In this paper, we report the structure of these printing sheets and the printing characteristics. These printing sheets that consist of a dye transfer sheet and a color receiving sheet are as follows. (1) A dye transfer sheet is coated on the top of PET film with a coloring material layer that contains inorganic particles that are projected on the coloring material layer of the dye transfer sheet, and is coated on the bottom with a heat resisting, slipping layer of hardening resin that contains lubricants and fine inorganic particles. ( 2 ) A color receiving sheet, of which the base has a white covering layer on. the thicker PET film, is coated on the base with a color developing layer that contains two kinds of immiscible color developing resins each other and inorganic particles.
If we use a line type thermal printing head and signal processing technology, with the developed dye transfer sheets, we will reproduce pictorial images with satisfactory color density and gradation, by printing one line in 16. 7 ms with the energy of 6 J/em². Moreover, we can have the possibility of high speed printing in 5 ms at one line with the energy of 3. 5 J/cm².

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A simple roller feed mechanism can not feed infinitely long paper without any lateral deviation. Therefore, a new paper feed mechanism which comprises of a paper postiton sensor and two roller apparatuses, which feed separately both sides of the paper, has been developed.
This paper describes the paper feed mechanism performance and the design method. At the first step, fundamental equations of paper movement are introduced, and then, the total equation of motion is derived in consideration of driving motor rise time. This equation becomes socond order differential equation in the case of the rise time, P=O. The performance is desided by two important parameters which are functions of paper width, paper velocity and feed back constant.
The equation of P≠O is numerically analysed and the following result is gotten. If the motor rise time, P, is selected so that ω₀ VP is smaller than 0.7, where ω₀ is a system constant and V is paper velocity, the nearly same settling distance as for P=0 can be realized.
At the end of the paper, an example of the design method is shown, with experimental results.

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This paper describes paper feeding and folding system in automatic post-treatment of duplicating work, such as fold, punch and seal treatment. In the paper feeding system, the occurence of miss feeding and piled paper feeding has been confirmed that it would be contributed to the increasing feed resistance, for adhere force of paper each other. This adhere force depends on the static-electric force that is mainly caused by the paper friction, this static-electric force has also been confirmed that it depends on rather the surface condition than the electric resistance of paper.
In the copied paper folding system, there have several kind of unique treatment, such as parallel folding of large size paper, folding back of paper edge, folding down of Z shaped style and rotation of feeding direction etc.

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