Abstract: An optical reading apparatus (bar code reader) including a plurality of light emitting elements, each light emitting element emitting light in different directions onto an information recording surface which has a linear recording (bar code pattern) printed thereon. A light receiving element receives reflected light from the information recording surface and generates a recording medium read signal for each light emitting element which is transmitted to a signal processing section. The signal processing section includes a plurality of conversion processing routes for converting the recording medium read signals from the plurality of light emitting elements into a plurality of display signals. Each of the display signals is then decoded separately.

Abstract: An optical reading apparatus (bar code reader) including a plurality of light emitting elements, each light emitting element emitting light in different directions onto an information recording surface which has a linear recording (bar code pattern) printed thereon. A light receiving element receives reflected light from the information recording surface and generates a recording medium read signal which is transmitted to a signal processing section for converting the recording medium read signal into a display signal. The recording medium read signal is also transmitted to a regular reflection detection section. When the regular reflection detection section detects the occurrence of a regular reflection condition from the recording medium read signal, the regular reflection detection section transmits a regular reflection detection signal to a driving controlling section which controls light emission from the plurality of light emitting elements.

Abstract: A light emitting diode driving circuit for supplying a driving pulse to a light emitting diode to thereby cause the light emitting diode to intermittently emit light is disclosed which comprises a clamping circuit, a photodiode disposed in the vicinity of the light emitting diode for detecting the optical output power of the light emitting diode, an AC amplifier having its DC operating point stabilized by means of a DC feedback circuit for AC amplifying the detected output from the photodiode, a shaping circuit for shaping the output amplified signal from the AC amplifier, and a comparison circuit for comparing for voltage the output shaped signal from the shaping circuit and a reference voltage, in which the clamping voltage of the clamping circuit is controlled by the output of the comparison circuit and, thereby, the optical output power of the light emitting diode is maintained constant.

Abstract: A magnetic rotation sensor is disclosed, in which by raising the precision of the size between a first hole for positioning a magnetic rotation drum and second holes for positioning pin guides and at the same time by keeping the outer diameter of the pin guides at a high precision, the gap between the drum described above and a sensor supported by the pin guides can be kept precisely almost without any adjustment.