Abstract: A distance measuring device includes a measuring unit, a controlling unit, and an accessory part. The measuring unit includes an applying unit that applies a transmission wave and a detector that detects a reflected wave resulting from the transmission wave. The controlling unit is configured to perform a measurement, by using the measuring unit, a distance to an object to which the transmission wave is applied. The accessory part is attached to the measuring unit and configured to operate when energized. The controlling unit is configured to control energization of the accessory part in accordance with a state of the measurement of the distance performed by using the measuring unit.

Abstract: Paper has a detection pattern having a length in a main scanning direction, the length becoming shorter from upstream to downstream along a paper feeding direction. An image sensor detects the detection pattern and outputs a detection signal including data in the main scanning direction (length y). A control unit calculates a position of a vertex of the detection pattern, by using the detection signal, a feeding speed, an angle being half of the vertex angle of the pattern, and an imaging time, so as to correct an image forming position on the back side to coincide with an image on the front side. The detection signal from the sensor with a low operation speed is processed according to a method utilizing a shape feature and the like of the detection pattern, thereby precisely detecting the position of the paper in the feeding direction.

Abstract: Paper has a detection pattern having a length in a main scanning direction, the length becoming shorter from upstream to downstream along a paper feeding direction. An image sensor detects the detection pattern and outputs a detection signal including data in the main scanning direction (length y). A control unit calculates a position of a vertex of the detection pattern, by using the detection signal, a feeding speed, an angle being half of the vertex angle of the pattern, and an imaging time, so as to correct an image forming position on the back side to coincide with an image on the front side. The detection signal from the sensor with a low operation speed is processed according to a method utilizing a shape feature and the like of the detection pattern, thereby precisely detecting the position of the paper in the feeding direction.