Abstract: A HID lamp light source device in which the disadvantage of acoustic resonance is avoided is achieved in a light source device in which a discharge lamp has a pair of opposed electrodes connected to a feed device which is used for starting the discharge lamp and for supplying a discharge current to the electrodes by the feed device using a switching device for controlling the amount of feed for the discharge lamp and in which phase modulation is added to the essentially periodic switching operation of the switching device.

Abstract: A HID lamp light source device in which the disadvantage of acoustic resonance is avoided is achieved in a light source device in which a discharge lamp has a pair of opposed electrodes connected to a feed device which is used for starting the discharge lamp and for supplying a discharge current to the electrodes by the feed device using a switching device for controlling the amount of feed for the discharge lamp and in which phase modulation is added to the essentially periodic switching operation of the switching device.

Abstract: To prevent beam fluctuation produced when a nonlinear optical crystal is maintained at a high temperature, a beam passage component is provided at the beam entrance and exit sides of the nonlinear optical crystal beam of the crystal support device, and the temperature at the end of the beam passage component away from the crystal is controlled to within a range of difference from ambient temperature at which the beam will be stable.

Abstract: To cement UV radiation-transmitting substrates to one another without deformation and within a short time, and to cement them together with high efficiency without an aluminum film of an information recording layer melting, according to the invention, a device for bonding discs to one another is provided having a radiant light source which irradiates the discs with radiant light which contains ultraviolet radiation at least once in a flash; a wavelength selector which is placed in the optical path between the radiant light source and the discs at a distance from the discs, which transmits the ultraviolet rays and absorbs light in a range of wavelengths which are absorbed by the UV radiation-transmitting substrates of the discs; a cooling device which admits and discharges cooling air between the radiant light source and the wavelength selector.

Abstract: In a color filter or a monochromatic filter (4) to be used by bonding to imaging sensor (1), at least two resin layers (A) and (B) adjacent to each other on transparent substrate and having different refractive indices are furnished, and the boundary surface of these resin layers (A) and (B) is formed in such curved surface that incident light (7) is converged on each of the light receiving units (2) of imaging sensor. Therefore, light converging effect can be obtained even on a solid-state imaging device of bonding type, and the sensitivity can be increased.