Abstract: A display device includes a light emission unit having a plurality of colors for radiating light by feeding electrical power thereto; a drive unit for feeding electrical power to the light emission unit; and a control unit for controlling the drive unit based on the color to be illuminated by the light emission unit.

Abstract: An optical encoder comprising: an optical scale having a light-transmitting portion and a non-transmitting portion the non-transmitting portion being composed of a slanted face an incident angle of incoming light to which is set larger than the critical angle, the both portions being alternately formed on a protruding mark area formed on a part of a translucent member; light projecting device for illuminating the optical scale; and photoelectric converting device for converting the light, modulated by the optical scale, into electrical signal.

Abstract: A rotary encoder comprises a light emitting device, a photosensor, sampling means arranged between the light emitting device and the photosensor for intercepting the light emitted by the light emitting device as the sampling means is rotated, monitoring means arranged on a side of the sampling means facing the light emitting device in adjacent to the light emitting device for sensing a portion of the light from the light emitting device and producing a signal representing a light intensity sensed, and control means for controlling the light intensity of the light emitting device in accordance with the output of the monitoring means.

Abstract: A printer for printing characters on a recording medium includes, a printing drum provided on a first portion and a second portion of the outer periphery thereof respectively with a first set of type faces and a second set of type faces, the first set of type faces being adapted to print characters of odd or even digit positions in a row of characters to be printed while the second set of type faces is adapted to print remaining characters of even or odd digit positions in the row of characters to be printed, the top surface of each of the first and second sets of type faces being retracted from the outer periphery of the printing drum, and each face being provided with a resilient member on at least a part of circumference thereof; a hammer unit positioned in the printing drum and provided with a plurality of hammers, the hammers being adapted to selectively thrust faces of the first and second sets through the outer periphery of the printing drum to bring the hammers in pressure contact with the recording m

Abstract: An electronic apparatus comprises a left-hand unit and a right-hand unit mutually connected to constitute a foldable structure, in which a display device is provided in one of the units while an aperture is provided in the other to enable observation of the display device even in the folded state of the apparatus. Operational keys are provided on the other unit or on both units to enable operation of the apparatus in the open and/or folded position thereof.