Abstract: Provided is a recording method with which wasteful consumption of the M number (M/#) of the recording material is prevented, and with which the recording density is improved. An optical information recording device that utilizes interference between signal light and reference light to record information on an optical information recording medium is equipped with: a light source that emits light toward an optical recording medium; a beam-splitting element that splits the emission light emitted from the light source into signal light and reference light; and a reference light angle control unit that controls the incidence angle of the reference light with respect to the optical information recording medium.

Abstract: A reference beam adjusting method for reproducing information recorded on an optical information recording medium by utilizing interference of a signal beam with a reference beam includes a step of changing the wavelength of the reference beam; a step of changing the angle of the reference beam to the optical information recording medium; a step of detecting a brightness distribution of the reproduction image from the optical information recording medium; a step of calculating a gravity center dispersion in the brightness distribution of the reproduction image; and a step of controlling the angle and wavelength of the reference beam based on the gravity center dispersion.

Abstract: An optical information reproducing device includes: a light source that emits light to the optical information recording medium; a light source control unit that controls a wavelength of the light emitted from the light source; a reference beam angle control unit that controls an incidence angle of the reference beam to the optical information recording medium; a light detector that detects a reproduction image from the optical information recording medium or a brightness distribution of the reproduction image; a reproduction image processing unit that detects a bright line of the reproduction image on the basis of a detection result of the light detector and outputs a detection result of the bright line; and a controller that controls the wavelength of the light emitted from the light source, on the basis of an output of the reproduction image processing unit, and controls the incidence angle of the reference beam.

Abstract: An optical information reproducing device includes: a light source that emits light to the optical information recording medium; a light source control unit that controls a wavelength of the light emitted from the light source; a reference beam angle control unit that controls an incidence angle of the reference beam to the optical information recording medium; a light detector that detects a reproduction image from the optical information recording medium or a brightness distribution of the reproduction image; a reproduction image processing unit that detects a bright line of the reproduction image on the basis of a detection result of the light detector and outputs a detection result of the bright line; and a controller that controls the wavelength of the light emitted from the light source, on the basis of an output of the reproduction image processing unit, and controls the incidence angle of the reference beam.

Abstract: A city refuse incinerator provided with stoker type firing equipment for combustion of city refuse has gas injectors installed low on the inside of a furnace body to inject low temperature inert combustion exhaust gas, purified in a dust collector, so that a gas curtain is formed on the inner surface of side walls of the furnace by the low temperature inert gas, thus preventing the formation of clinkers.

Abstract: Stoker type firing equipment for use with a city refuse incinerator provided with step type stokers formed by combining movable fire grates and fixed fire grates alternately and gas injectors installed in the fixed fire grates inject low temperature inert gas onto burning refuse, thus allowing free control of burning rate and burning temperature of the refuse by injecting the low temperature inert gas through the gas injectors.

Abstract: In a low NO.sub.x emission incinerator a refuse supply stoker (1), a dry-ignition stoker (2), a gas generation stoker (3), and a complete combustion stoker (4) are positioned in descending stair-step fashion beneath a combustion chamber (A). In the dry ignition stoker (2) and the gas generation stoker (3) refuse is thermally decomposed under an amount of air which is less than the amount of air theoretically required for complete combustion, so that reducing gases such as CO, NH.sub.3, and the like are generated. At the complete combustion stoker (4) the residuum of the refuse is completely combusted under an amount of air greater than the required theoretical amount. Air is supplied through nozzles (7,8,9) at successive points above the flow route of combustion gas inside the combustion chamber (A) so that the temperature in the combustion chamber (A) is maintained in a range to reduce the amount of NO.sub.x generated by the combustion of gases.