Abstract: A image pickup device having a rewritable recording member on which optical patterns are repeatedly recorded as electrostatic images using a writing head with an electric potential applied between the head and recording member. Each image recorded on the recording member is erased prior to recording a subsequent image by application of an alternating voltage or an electric potential of opposite polarity between the writing head and recording member.

Abstract: An output apparatus for printing a proof sheet and making a planographic printing plate, comprising a printing image data generating means for producing the digital data of a plurality of different color images corresponding to a predetermined number of colors obtained by the color separation of the image data of an original to be printed; a proof sheet outputting means for sequentially forming a screened dot image of each color by using each color toner based on the printing image data derived from said printing image generating means; a planographic printing plate output means for forming a screened dot image of each color by using one recording medium for each color and the oil affinitive toner of each color based on the digital data of each color generated by said printing image data generating means.

Abstract: A charge recording and reproducing device is constituted by a transfer device which transfers a film shaped recording medium from one to other side, a recording head adapted to form an electrostatic latent image from an image formed on the recording medium, an eraser for erasing the electrostatic latent image, a developing apparatus for developing the electrostatic latent image, and a reading device for reading the developed image.

Abstract: A voltage is electrostatically induced at a sensing device in correspondence with a surface potential of a measured object. In the case where the sensing device uses a field effect transistor in transferring detected information, there are some factors decreasing the accuracy of detection. Various new arrangements prevent such decreases in the accuracy of detection. In the case of the surface potential of the measured object corresponds to an optical image, new arrangements ensure accurate detection of the optical image. In some cases, color component signals are obtained on the basis of a detection signal.

Abstract: An apparatus for reading out a charge latent image from a recording medium includes a photo-modulation member exposed to an electric field from the recording medium and exposed to reading light. The photo-modulation member varies a condition of the reading light in accordance with the electric field. A photoconductive member is disposed between the recording medium and the photo-modulation member. Control light is applied to the photoconductive member. The control light has an intensity which varies with respect to time.

Abstract: An apparatus for detecting a distribution of a surface potential on a measured object comprises a reading head opposing the measured object. The reading head includes an optical modulator subjected to an electric field representative of the surface potential distribution. The electric field applied to the optical modulator is varied in an alternating manner.

Abstract: In a control system for an information recording laser beam, an intensity of a laser beam is varied in a predetermined variation pattern during each of sequential one-pixel periods. The laser beam is periodically activated and deactivated in synchronism with a change of the one-pixel periods. A duration of the activating the laser beam within each of the one-pixel periods is controlled in accordance with a density of each of pixels of an image to be recorded.

Abstract: A charge latent image is formed on a recording medium in response to information and a reference pattern so that the information and the reference pattern are recorded on the recording medium. During a reproducing process, the information is read out from the recording medium and an information signal representing the readout information is generated. In addition, the reference pattern is read out from the recording medium and a reference signal representing the reference pattern is generated. The information is demodulated from the information signal. The reference signal is used in the demodulation of the information from the information signal.

Abstract: An image pickup apparatus comprising a circuit for forming an electric charge image corresponding to an optical image of an object to be image-picked up in a photo-photo conversion element constructed of two transparent electrodes with at least a photoconductive layer and a photo-modulation layer being interposed therebetween, by applying a light from the object to the photoconductive layer, a circuit for reading the electric charge image corresponding to the optical image of the object as optical information, by applying a reading light to the photo-modulation layer, means for erasing the electric charge image corresponding to the optical image of the object, wherein an erase operation and read operation are intermittently repeated for the electric charge image, and the reading means operating in a limited period which is substantially short compared to a period in which the forming means operate.

Abstract: A reproducing apparatus which reproduces a charge latent image recorded in a recording medium. The apparatus has an electromagnetic radiation source, an optical system for leading an electromagnetic radiation ray emitted from the electromagnetic radiation source in a direction toward a recording medium on which an object information to be read is prerecorded as a charge latent image, and a read head arranged closely facing to the recording medium and arranged in series in a travelling path of the electromagnetic radiation ray.