JPS6486U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the reflective paper detection sensor according to the present invention, Fig. 2 is a timing chart explaining the operation of Fig. 1, and Figs. 3 a, b, and c are external appearances of conventional photo sensors, respectively. A perspective view showing the actual paper detection, a schematic diagram and a circuit diagram showing the state of actual paper detection,
Figures 4a, b, and c are schematic diagrams showing the state of the paper spacing, Figure 4d is a schematic diagram showing the paper spacing moving under the sensor, and Figure 5a is a circuit showing another conventional device. Figures 5b and 5c are graphs showing the signals corresponding to Figures 4a, b, and c together, and graphs showing their outputs after amplification. Figure 6 is the paper spacing and signal length. FIG. 7 is an explanatory diagram illustrating the relationship between the two. FIG. 7 is an explanatory diagram illustrating reading by the CPU. 1...Sensor, 6...Paper, 8...Light emitting diode, 9...Phototransistor, 11...Comparator, 12...One shot multivibrator, 13...OR circuit.

Claims (1)

[Scope of utility model registration request] In a reflective paper detection sensor that detects the presence or absence of transfer paper by detecting reflected light from a light emitting diode or the like with a phototransistor, the detection output is passed through a comparator and converted from a linear output to a digital output. output, the output is input to a one-shot multivibrator to create an output with a certain length of delay, the two outputs are input to an OR circuit, and the output from the OR circuit is output as a sensor output. Reflective pattern detection sensor.