Abstract: An exposure apparatus for use in fabricating a printed circuit board. A thermally-written liquid-crystal light valve is provided in which a pattern is formed by opaque portions and transparent portions. A writing optical system directs a heating spot light onto the light valve. The light valve and/or the heating spot light is movable, relative to the other. A projecting optical system is arranged which transmits a luminous flux emitted from a light source, through a liquid-crystal layer within the liquid-crystal light valve. The projecting optical system illuminates a subject with the transmitted luminous flux.

Abstract: An exposure apparatus for use in fabricating a printed circuit board. A thermally-written liquid-crystal light valve is provided in which a pattern is formed by opaque portions and transparent portions. A writing optical system directs a heating spot light onto the light valve. The light valve and/or the heating spot light is movable, relative to the other. A projecting optical system is arranged which transmits a luminous flux emitted from a light source, through a liquid-crystal layer within the liquid-crystal light valve. The projecting optical system illuminates a subject with the transmitted luminous flux.

Abstract: An exposure apparatus for use in fabricating a printed circuit board. A thermally-written liquid-crystal light valve is provided in which a pattern is formed by opaque portions and transparent portions. A writing optical system directs a heating spot light onto the light valve. The light valve and/or the heating spot light is movable, relative to the other. A projecting optical system is arranged which transmits a luminous flux emitted from a light source, through a liquid-crystal layer within the liquid-crystal light valve. The projecting optical system illuminates a subject with the transmitted luminous flux.

Abstract: A stroboscope device for diagnosis of larynx emissions. The system uses a saw tooth wave for generating in synchronization with a vocal cord vibration saw tooth waves whose voltages are constant in minimum and maximum values. A reference voltage generating circuit is used whose output voltage is variable and a discharge tube light emission control signal generating circuit compares the instantaneous voltage of each saw tooth wave with the output of the reference voltage generating circuit to generate a discharge tube light emission control signal in a phase shift range with respect to said vocal cord vibration. The discharge tube light emission control signal may be generated in a desired phase of said vocal cord vibration every period of said vocal cord vibration or at a repetition rate of multiple periods of the vocal cord vibration.

Abstract: A larynx stroboscope device capable of photography following the anode or cathode terminal of a flash discharge tube is connected to a photographing charge-discharge capacitor by the release operation of a camera. A trigger pulse is applied to the trigger terminal of the flash discharge tube in synchronization with a vocal cord vibration signal so that the flash discharge tube emits light while the shutter of said camera is open. Upon completion of a photographing operation, all the functions are automatically restored to the states obtained before the release operation. Alternatively, a charge-discharge system may be used. By the release operation of a camera supply of charging current to said capacitor is suspended. Thereafter a trigger pulse is applied to the trigger terminal of said flash discharge tube in synchronization with a vocal cord vibration frequency so that said flash discharge tube emits light while the shutter of said camera is open.

Abstract: A device for processing a waveform for a larynx stroboscope having a plurality of filters receiving a vocal cord vibration signal. The outputs of the plurality of filters are automatically switched over by subjecting the outputs of the plurality of filters to comparision with one another to detect the fundamental wave component of the vocal cord vibration signal.