Abstract: In the information recording an reproducing method and apparatus according to the present invention, a piece of picture image information is recorded as an analog quantity or a digital quantity an information carrying medium in a planar manner at a high density, charge potential is read for outputting electric signals to correspond to the recorded picture image information and then the outputted signals are printed out by means of various display unit or output device, with high quality and high resolution as well as ease processing of the information. The information carrying medium provides a long period of storage of information and enables stored picture image information to be repeatedly reproduced with a picture quality according to need.

Abstract: In the information recording an reproducing method and apparatus according to the present invention, a piece of picture image information is recorded as an analog quantity or a digital quantity an information carrying medium in a planar manner at a high density, charge potential is read for outputting electric signals to correspond to the recorded picture image information and then the outputted signals are printed out by means of various display unit or output device, with high quality and high resolution as well as ease processing of the information. The information carrying medium provides a long period of storage of information and enables stored picture image information to be repeatedly reproduced with a picture quality according to need.

Abstract: In the information recording an reproducing method and apparatus according to the present invention, a piece of picture image information is recorded as an analog quantity or a digital quantity an information carrying medium in a planar manner at a high density, charge potential is read for outputting electric signals to correspond to the recorded picture image information and then the outputted signals are printed out by means of various display unit or output device, with high quality and high resolution as well as ease processing of the information. The information carrying medium provides a long period of storage of information and enables stored picture image information to be repeatedly reproduced with a picture quality according to need.

Abstract: In the information recording an reproducing method and apparatus according to the present invention, picture image information is recorded as an analog quantity or a digital quantity on an information carrying medium in a planar manner at a high density, charge potential is read for outputting electric signals to correspond to the recorded picture image information and then the outputted signals are printed out by means of various display unit or output device, with high quality and high resolution as well as ease processing of the information. The information carrying medium provides a long period of storage of information and enables stored picture image information to be repeatedly reproduced with a picture quality according to need.

Abstract: In the information recording an reproducing method and apparatus according to the present invention, a piece of picture image information is recorded as an analog quantity or a digital quantity an information carrying medium in a planar manner at a high density, charge potential is read for outputting electric signals to correspond to the recorded picture image information and then the outputted signals are printed out by means of various display unit or output device, with high quality and high resolution as well as ease processing of the information. The information carrying medium provides a long period of storage of information and enables stored picture image information to be repeatedly reproduced with a picture quality according to need.

Abstract: A camera tube device for use in a television camera comprises an electron gun including a cathode electrode for emission of an electron beam, and first and second grid electrodes respectively having apertures for controlling the diameter of the electron beam. The aperture of the second grid electrode is sufficiently smaller than the aperture of the first grid electrode. The first grid electrode is applied with a positive voltage relative to the cathode electrode and the second grid electrode is applied with a positive voltage relative to the cathode electrode which is higher than that applied to the first grid electrode. The positive voltage applied to the first grid electrode has such a value that forms the electron beam having passed through the aperture of the first grid electrode into a laminar flow beam.

Abstract: An electron gun for a television camera tube comprises a cathode for emission of electrons, a first grid disposed subsequently to the cathode and having a first aperture supplied with a positive voltage relative to the cathode, a second grid disposed subsequently to the first grid and having a second aperture supplied with a higher positive voltage than that supplied to the first grid, and an intermediate grid interposed between the first and second grids and having a hole. The intermediate grid forms a divergent electron lens near the first aperture between the first and second grids.

Abstract: A TV camera tube suitable for the HN system comprising a glass faceplate covered by an n-type transparent electrode layer consisting of Nesa glass on which a thin p.sup.+ -type layer, a p-type layer and an n-type layer are deposited in succession to form a photoconductive layer. A blocking layer is deposited on the photoconductive layer to form a protected photoconductive target. A metal mesh covered by an insulating material and a collector electrode for collecting secondary electrons emitted from the target are arranged on the electron beam scanning side of the target.

Abstract: An electron gun is disclosed which includes a thermionic cathode for emitting an electron beam, a grid having a first aperture for controlling the diameter of the electron beam, and an anode having a second aperture for catching a part of the electron beam having passed through the first aperture; and in which the diameter of the first aperture is smaller than or equal to the diameter of the second aperture, and the grid and the anode are applied with positive potentials relative to a cathode potential, for example, with a voltage of 5 to tens of volts and a voltage of 100 to 500 volts, respectively, to form a uniform axial field between the grid and the anode, thereby generating a laminar flow electron beam having a constant current density.

Abstract: A method of manufacturing a camera tube having structure suitable for the HN system comprising a glass faceplate covered by an n-type transparent electrode layer consisting of, for instance, Nesa glass on which a thin p.sup.+ -type layer, a p-type layer and an n-type layer are deposited in succession to form a photoconductive layer on which a block layer is deposited to form a protected photoconductive target. A metal mesh covered by an insulation material and a collector electrode for collecting secondary electrons emitted from the target are arranged on the electron beam scanning side of the target.

Abstract: In a vacuum container an active (or atomic state) gas consisting of either one of active hydrogen, active oxygen and active nitrogen with a partial pressure of 1.times.10.sup.-3 Torr or less is produced. In an atmosphere of the active (or atomic state) gas, a film, which consists of a compound presenting semiconductor characteristics (CdS, CdSe, ZnSe, ZnS, ZnTe, CdTe) or a solid solution thereof and presents a desired polarity property such as p, n, p.sup.+ or n.sup.+, is vapor-deposited on a substrate at a desired position with a desired thickness, so as to fabricate an evaporation device which is preferable, for example, as a photoconductive target for a television camera tube.

Abstract: In a vacuum container an active (or atomic state) gas consisting of either one of active hydrogen, active oxygen and active nitrogen with a partial pressure of 1.times.10.sup.-3 Torr or less is produced. In an atmosphere of the active (or atomic state) gas, a film, which consists of a compound presenting semiconductor characteristics (CdS, CdSe, ZnSe, ZnS, ZnTe, CdTe) or a solid solution thereof and presents a desired polarity property such as p, n, p.sup.+ or n.sup.+, is vapor-deposited on a substrate at a desired position with a desired thickness, so as to fabricate an evaporation device which is preferable, for example, as a photoconductive target for a television camera tube.

Abstract: This specification discloses an improvement in an image pickup device incorporating therein an optical system which reduces the delay of the photoelectric signal by separately adding bias light to the light from an object. The improvement is characterized in that the bias light is introduced through that portion of the face plate which makes no contribution to image pickup.