Dainippon Screen Mfg. Co., Ltd.

Koji Yao

Tsutomu Ueyama

Kiyoshi Maeda

Kunio Tomohisa

Yoshito Koyama

A D-A converter outputs feed pitch error signals on an exposure head. The error signals are inverted to be supplied to a multiplier, and non-inverted to be supplied to a second multiplier. The exposure head radiates multiple beams, and ON/OFF dot signal for odd channels thereof are supplied to the multiplier and ON/OFF dot signals for even channels are supplied to the second multiplier respectively. The multipliers multiply the supplied signals, whereby values of the ON/OFF dot signals are changed in response to the errors. Thus, the beams outputted from the respective channels are controlled in power intensity, whereby diameters of printing spots on photosensitive material are changed per channel.

Method and device for controlling exposure beams

Method and apparatus for loading an unexposed film on a rotary drum in a exposure/recording apparatus, such as raster plotter or a color scanner, and unloading the exposed film out of the drum, the replacement of films being automatically carried out by the use of a supply pallet and a discharge pallet, suckers, and maneuverable linkages so as to enable the film to travel from the supply pallet to the drum, and, after exposure, to the discharge pallet.

Method and device for loading and unloading a film on and out of a

An output of a rotary or linear encoder of lower-precision (a subject encoder) is corrected according to that of higher-precision (a reference encoder) to provide higher precision output signals. In the present invention, a frequency multiplied pulse signal is obtained by multiplying a low precision output of a subject encoder by a multiplier. The number of pulses comprised in a portion of the multiplied pulse signal corresponding to a unit movement length of an object connected to the subject encoder is obtained by a hardware operation or by a program stored into a memory. A higher-precision output signal is obtained by dividing the frequency of the multiplied-frequency pulse signal of the subject encoder by a variable divisor corresponding uniquely to the number of high precision reference pulses between low precision subject encoder pulses when the object and the subject encoder are connected and moved. The various divisors can be stored as binary data consisting of high and low states corresponding to a unit movement length obtained by dividing the frequency of an output of the reference encoder at each pulse occurrence of the multiplied frequency pulse signal of the subject encoder. The storage for the divisors is preferably an EPROM which, along with the subject encoder, is connected to a calibration device for determining the high precision divisors. The EPROM and the subject encoder are removable from the calibration device for connection to an image reproduction device.

Increasing precision of encoder output

In reproducing images, magnification conversion is performed either by reading image data from a memory in a skipped or overlapped fashion of their addresses of sub-scanning direction factor or by scanning certain scanning lines of an original picture (recording film) in a skipped or overlapped fashion in the sub-scanning direction according to a specified magnification ratio.

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Kyoto, Japan

Koji Yao