Abstract: A method of density correction in a heat developing apparatus of which photothermographic recording material is thermally developed by light or heat application, comprising the steps of outputting a density correcting chart for setting density correcting conditions, measuring the image densities of the density correcting chart with a densitometer using a monochromatic light source, and correcting density correcting conditions for image recording in the heat developing apparatus based on the measured densities, wherein the density correcting conditions are corrected by using only the densities of low to middle density areas out of the densities of low to high density areas as measured with the built-in densitometer and corrected based on the density correcting chart.

Abstract: A method of density correction in a heat developing apparatus of which photothermographic recording material is thermally developed by light or heat application, comprising the steps of outputting a density correcting chart for setting density correcting conditions, measuring the image densities of the density correcting chart with a densitometer using a monochromatic light source, and correcting density correcting conditions for image recording in the heat developing apparatus based on the measured densities, wherein the density correcting conditions are corrected by using only the densities of low to middle density areas out of the densities of low to high density areas as measured with the built-in densitometer and corrected based on the density correcting chart.

Abstract: A heat-development recording apparatus including a laser modulation section for modulating a laser beam in accordance with image data; an exposing section for scanning and exposing a heat development photosensitive material having photosensitivity with respect to a wavelength of not more than 750 nm with the modulated laser beam so as to form a latent image; and a heat development station for developing the exposed photosensitive material with heat, the heat-development recording apparatus including: a frequency processing section for processing image data, the frequency processing section being provided in front of the laser modulation section.

Abstract: The thermal printer forms a recorded image in accordance with image data on a thermal recording material by using a thermal head. The thermal printer includes a first control mode for cleaning the thermal printer by using the thermal recording material and a second control mode for measuring density of the thermal printer by using the thermal recording material, in which the first and second control modes are switched at a partway of one piece of the thermal recording material. In the thermal printer various kinds of materials used for the processing of management, adjustment and maintenance can be used more effectively than before.

Abstract: A heat-development recording apparatus comprising: a laser modulation section for modulating a laser beam in accordance with image data; an exposing section for scanning and exposing a heat development photosensitive material having photosensitivity with respect to a wavelength of not more than 750 nm with the modulated laser beam so as to form a latent image; and a heat development section for developing the exposed photosensitive material with heat, the heat-development recording apparatus including: a frequency processing section for processing image data, the frequency processing section being provided in front of the laser modulation section.

Abstract: A plurality of image signals are obtained, which represent a radiation image of a single object or radiation images of the single object, and which have different frequency characteristics, each of the image signals being made up of a series of image signal components. The image signal components of the plurality of the image signals, which image signal components represent corresponding picture elements, are weighted with predetermined weight factors. The weighted image signal components of the plurality of the image signals, which image signal components represent corresponding picture elements, are added to one another, and an addition signal is thereby obtained. The value of the weight factor with respect to the frequency components, which have a low signal-to-noise ratio, is rendered smaller than the value of the weight factor with respect to the frequency components, which have a high signal-to-noise ratio, in accordance with the frequency characteristics of each of the image signals.

Abstract: A stimulable phosphor sheet, on which a radiation image has been stored, is exposed to stimulating rays, which cause it to emit light in proportion to the amount of energy stored thereon during its exposure to radiation. The light emitted by the front surface of the stimulable phosphor sheet and the light emitted by the back surface of the stimulable phosphor sheet, are detected photoelectrically. The image signal components of the two image signals are subtracted from each other, which represent corresponding picture elements on the front and back surfaces of the stimulable phosphor sheet, difference values being thereby obtained. A judgment is made as to whether each of the difference values falls or does not fall within a predetermined range. In cases where a difference value is judged as being outside the predetermined range, it is determined that an abnormal signal component is contained in at least either one of the two image signals.

Abstract: A controlled radial magnetic bearing device which has an X-axis electromagnet and a Y-axis electromagnet provided on the X-axis and Y-axis perpendicular to each other in a plane normal to the axis of a rotary shaft, X-axis and Y-axis position sensors for detecting any displacement of the rotary shaft from its reference position, and X-axis and Y-axis control circuits for feeding the outputs of said position sensors back to the electromagnets to control them.