Abstract: An exposure system for use in an image recording apparatus includes a photosensitive and pressure-sensitive recording sheet which is sensitive to light in a certain wavelength range. The exposure system also includes a light source disposed on one side of the photosensitive and pressure-sensitive recording medium for applying the light in the predetermined wavelength range to the photosensive and pressure-sensitive recording medium through a first original, and a space region disposed on said one side for accommodating therein an optional exposure unit for optionally exposing the photosensitive and pressure-sensitive recording medium through a second original. The light source is movable while applying the light to the photosensitive and pressure-sensitive recording medium through the first original.

Abstract: An image recording apparatus includes a medium supporting device for supporting a roll of a photosensitive recording medium in the form of a web, such that an active length of the web supplied from the roll extends along an exposing path. The apparatus further includes an exposing device for imagewise exposing the active length of the web of the photosensitive recording medium to an image radiation representative of an original image to be reproduced, while the active length is placed in the exposing path. The apparatus has an upper section disposed above the exposing path and including the medium supporting device, and a lower section disposed below the exposing path and including the exposing device. The upper and lower sections are separable from each other at the exposing path.

Abstract: A process and system for forming images on a recording sheet, according to source image information as provided on an original, wherein a pressure-sensitive photosensitive sheet is image-wise exposed to a radiation, to form thereon latent images corresponding to the source image information, and a pressure is applied to the image-wise exposed photosensitive sheet, to cause a chemical reaction and thereby develop the latent images into visible images on the recording sheet. The thus pressurized recording sheet is heated so that the chemical reaction is promoted to thereby increase a density of the visible images.

Abstract: A pressure developing device having a pair of pressure developing rollers in an image recording apparatus. A pressure-sensitive recording sheet can be fed to pass between the pressure developing rollers, and has a pressure-sensitive image bearing layer on one surface thereof. A developer sheet can selectively be fed to pass between the pressure developing rollers in superposed relation to the pressure-sensitive image bearing layer. The pressure developing rollers are spaced from each other by a gap which is greater than the thickness of the pressure-sensitive sheet and smaller than the combined thickness of the pressure-sensitive sheet and the developer sheet. The pressure developing device also includes a friction roller held against a surface of the pressure-sensitive recording sheet opposite to the image bearing layer and rotatable for frictionally feeding the pressure-sensitive recording sheet.

Abstract: In an image recording apparatus, a housing is provided in its wall with an external insertion opening. A pair of heat-treatment rollers are arranged within the housing. A first predetermined transport path extends through a nip between the heat-treatment rollers. The developing sheet having carried thereon an image is transported along the first transport path and is heat-treated by the heat-treatment rollers. A second predetermined transport path different from the first transport path extends through the nip between the heat-treatment rollers. An article inserted through the external insertion opening can travel along the second transport path so that the article is heat-treated by the heat-treatment rollers. Preferably, the heat-treatment rollers are arranged at an upper location within the housing, and the wall provided therein with the external insertion opening is a top wall of the housing.

Abstract: An image recording sheet, such as a developer sheet, is fed so as to overlap a light-exposed sheet, such as a photosensitive pressure-sensitive sheet which carries an image recorded thereon. The image is transferred from the exposed sheet to the image recording sheet at a pressure developing unit. The image recording sheet is delivered to cause a leading end thereof to abut the exposed sheet, while being fed into the developing unit at a position near an inlet of the developing unit for allowing the image recording sheet to move along and with the exposed sheet into the developing unit. A device for feeding an image recording sheet is an image recording apparatus, said image recording apparatus including an exposure unit for light-exposure to said sheet for forming the latent image, and a pressure developing unit disposed at downstream side of the exposed unit at which the light-exposed sheet and the image recording sheet are overlappingly pressed.

Abstract: A pressure developing device has a pair of pressure developing rollers for pressing a photosensitive and pressure-sensitive recording sheet with a latent image formed thereon and a color developer sheet in overlapping relation to develop the latent image into a visible image and transfer the visible image onto the color developer sheet. The pressure developing rollers have respective pressing surfaces for pressing the photosensitive and pressure-sensitive recording sheet and the color developer sheet, and at least one of the rollers has non-pressing surface extending axially of the roller.

Abstract: In an image recording apparatus, a developing sheet is fed by a feeder substantially horizontally along a predetermined transport path. A pair of pressurizing and developing rollers are arranged in a plane substantially parallel to the developing sheet fed by the feeder. A guide arrangement is arranged in the predetermined transport path for changing a course of the developing sheet fed by the feeder and for guiding the developing sheet to a nip defined between the pair of pressurizing and developing rollers. A pressure-sensitive recording medium having carried thereon a latent image and the developing sheet are caused to pass through the nip, with the pressure-sensitive recording medium and the developing sheet superposed upon each other. The pressurizing and developing rollers cooperate with each other to apply pressure to the pressure-sensitive recording medium and the developing sheet to develop the latent image on the pressure-sensitive recording medium, onto the developing sheet.

Abstract: In a thermal fixing device for use in a recording apparatus, an image on a recording medium is thermally fixed while passing through a nip between a pair of rollers. In order to prevent the recording medium from being wound around one of the rollers disposed to contact with the image formed surface of the recording medium, a diameter of that roller is made smaller than a diameter of the remainder, whereby a resilient force of the recording medium produced when the latter is curved along the surface of the smaller diameter roller overcomes an adhesion force that the image formed surface of the recording medium adheres to the smaller diameter roller.

Abstract: In an exposure device in an image recording apparatus, a photosensitive recording medium is exposed with light containing an image of an original to thereby form a latent image corresponding to the original. In view of the fact that photosensitivity of the recording medium changes depending upon some factors, such as a temperature of the recording medium per se, an intensity of light irradiated onto the recording medium, the temperature of the recording medium is controlled so that an optimum photosensitivity is obtained. The change of the light intensity is compensated for by changing the temperature of the recording medium. To this effect, the temperature of the recording medium and the light intensity of a light source are sensed and the recording medium is heated by a heater element so as to indicate an optimum photosensitivity.

Abstract: An air-fuel ratio sensor comprising a limiting electric current type oxygen sensor portion, having a sequential stacking on a porous substrate of a first electrode with high gas permeability, a solid electrolytic thin film having a specific crystal orientation, a thickness of 0.1 to 30 .mu.m, and good crystallinity. The limiting electric current type oxygen sensor portion and second electrode with a high gas permeability, is arranged and connected in parallel with a resistive type oxygen sensor portion having interdigital electrodes formed on one or both major surfaces of an oxide semiconductor thin film, the resistance of which changes in accordance with oxygen partial pressure. The air-fuel ratio sensor also has a sensor heater formed on one surface of the porous substrate around the sensor portions. The overall structure of the sensor is coated with a porous ceramic coating to which a catalyst is added.

Abstract: A limiting electric current type oxygen sensor comprising a first electrode of a gas-permeable film, a thin solid electrolyte film which is crystallized along one direction to decrease resistance and which has a thickness falling in the range between 0.1 .mu.m and 30 .mu.m, and a second electrode of a gas-permeable film sequentially formed on an electrically insulating substrate. This limiting electric current type oxygen sensor is also provided with a porous coating layer or a dense coating layer. The porous coating layer made of Al.sub.2 O.sub.3, SiO.sub.2, spinnel, SiC, Si.sub.3 N.sub.4 and etc., has a porosity of not more than 30% and a thickness of not less than 1 .mu.m, and serves as a gas diffusion flow rate-determining portion. The dense coating layer serves to control a gas permeation path such that either the first electrode or the substrate is used as the gas diffusion flow rate-determining portion.

Abstract: An apparatus for detecting concentrations of a plurality of gas components has a single polarographic sensor capable of detecting an oxygen concentration and a composite concentration of oxygen gas, carbon dioxide gas and steam. A first voltage is applied to the polarographic sensor which then measures only the oxygen concentration, or a second voltage is applied to the sensor which then measures only the composite concentration of oxygen gas, carbon dioxide gas and steam. The first and second voltages are applied to the sensor in a time division manner. Upon application of first and second voltages in such a time division manner, corresponding currents flowing through the sensor are detected to obtain signals corresponding to the oxygen concentration and the composite concentration of oxygen gas, carbon dioxide gas and steam.

Abstract: A thin film oxygen sensor with a microheater incorporates an oxide semiconductor and has an integral structure of a sensor portion and a heater portion, wherein a porous catalyst layer is formed on a surface of the sensor portion, and a thickness and an average pore diameter of the catalyst layer are determined such that a ratio of the thickness to the average pore diameter falls within a range of 50 to 3,000. The oxygen sensor has good reproducibility, high stability, and high sensitivity for changing a resistance in response to a change in an oxygen content in an atmosphere. The oxygen sensor can be manufactured at low cost and has a compact construction.

Abstract: The invention provides a limiting electric current type oxygen sensor with a microheater, having: an oxygen ionic conductor; an anode and a cathode respectively formed on two major surfaces of the oxygen ionic conductor; an insulating film which has a porosity of not less than 0.2 [%], an average pore diameter of not less than 140 [.ANG.], and a thickness between 0.2 [.mu.m] and 10 [.mu.m], and which is formed on one of the anode and the cathode so as to regulate a flow rate of oxygen gas and to provide electrical insulation; and the microheater formed on the insulating film. The oxygen ionic conductor is electrically insulated from the microheater through the insulating film. The invention also provides a limiting electric current type oxygen concentration detecting device having the limiting electric current type oxygen sensor and a constant temperature control circuit.

Abstract: A sensor which has an insulating substrate on which is formed a heater layer for heating the sensor on a part thereof and which is operated above a predetermined temperature. The heater layer is made of a material which has a thickness of 0.2 .mu.m to 20 .mu.m and which is made of platinum, rhodium, palladium or a mixture thereof. The insulating substrate is made of alumina, quartz, spinel, magnesia, zirconia, or mixtures thereof. A heater protective layer having a thickness of 0.01 .mu.m to 500 .mu.m is made of materials based on alumina, silica, spinel, magnesia, zirconia or mixtures thereof.