Abstract: A traffic light device for emitting signal light includes: a light emitter unit which includes a light emitter being a light source of the signal light; a body which houses the light emitter unit; and a heater unit provided on a path of the signal light emitted by the light emitter unit inside the body, and including a plate-shaped heating glass, on a surface of which a conductive thin film having transparency is formed, and which generates heat when power is supplied to the conductive thin film via a pair of electrodes.

Abstract: The present invention has an objective to prevent images of particles from being transferred onto a photosensitive substrate, so in order to achieve such an objective, an exposure device of the present invention, which has an illumination optical system for illuminating a reticle having a pattern with a beam from an illumination source so that the pattern is formed on the substrate on exposure to light, is equipped with illuminating area setting means, which are arranged at two locations within the illumination optical system so as to set an illuminating area of the beam illuminating the reticle, and an optical system which places the illuminating area setting means being conjugate to the reticle.