JPH02264274A - Recording device - Google Patents

Abstract

PURPOSE:To simplify a circuit and to reduce the cost of a device by controlling a main motor, a fixing temperature, the light quantity of a light emitting diode, a polygon mirror driving motor and dot density by means of a computer. CONSTITUTION:The main motor 2, a heater for fixation 3, the light emitting diode 4, a dip switch 5 and the polygon mirror driving motor 6 are connected to the computer 1. The computer 1 performs with PWM control of the main motor 2, the control of the fixing temperature by turning on and off the heater for fixation 3, the control of the light quantity of the light emitting diode 4, the control of the dot density with the aid of a dot density switching signal and the PWM control of the polygon mirror driving motor 6. Thus, control circuits are reduced and the simplification of the circuit and the reduction of cost are contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a recording device such as a laser printer.

BACKGROUND OF THE INVENTION Laser printers equipped with computers are known.

Computers control the operation of laser printers, but their control is limited to a small portion of the laser printer, and there is no computer that can perform much control.

Problems to be Solved by the Invention For this reason, there are problems in that the number of control circuits for a laser printer is large and complicated, and the cost is high. The same applies to other recording devices.

An object of the present invention is to solve the above problems and provide a recording device with a simple circuit and low cost.

Means for Solving the Problems The recording device according to the present invention has a main motor, a fixing temperature,
This device is characterized in that the amount of light from the light emitting diode, the polygon mirror drive motor, and the dot density are controlled by a computer.

Since the main motor, fixing temperature, light intensity of the light emitting diode, polygon mirror drive motor and dot density are all controlled by a computer, the circuit is simple.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of an electric circuit of a laser printer, and the laser printer is equipped with a control computer (1) connected to a print controller.

A main motor (2), a fixing heater (3), a light emitting diode (4), a dip switch (5), and a polygon mirror drive motor (6) are connected to the computer (1). Then, PWM control of the main motor (2), control of the fixing temperature by turning on/off the fixing heater (3), control of the light amount of the light emitting diode (4), control of the dot density by the dot density switching signal, and driving of the polygon mirror. All PWM control of the motor (6) is performed by computer (1
) is carried out by

Therefore, the number of control circuits that were conventionally required is significantly reduced, and the circuitry is greatly simplified.

Next, one example of the above control will be briefly explained with reference to the flowcharts of FIGS. 2 to 5.

PWM control of the main motor (1) is performed as follows (see FIG. 2).

First, in step 11, the interrupt value (interrupt interval) from the encoder is read. The encoder is attached to the main motor (1), and this interrupt value corresponds to the rotational speed of the main motor (1). Next, this interrupt value is compared with the control target value, and if the interrupt value is equal to the target value in step 12, there is no need to change the speed, so the process ends; if they are not equal, the next Proceed to step 13. If the interrupt value is smaller than the target value in step 13, the process proceeds to step 14, where the PWM value is increased to increase the speed, and the process is terminated; if the interrupt value is larger than the target value, , the process proceeds to step 15, where the PWM value is decreased in order to reduce the speed, and then the process is terminated.

PWM control of the polygon mirror drive motor (6) is also similar to this.

The fixing temperature is controlled as follows (see FIG. 3).

First, in step 21, the output of the thermistor is changed to A/
Read the D-converted A/D conversion value. The thermistor is provided near the heater (3), and the A/D conversion value corresponds to the fixing temperature. Next, in step 22, A/
It is determined whether the D conversion value is, for example, 180° C. or higher. If the temperature is 180°C or higher, proceed to step 23, output a heater off signal, and then terminate the process.
1. If the temperature is not 80°C or higher, proceed to step 24.
After outputting the heater-on signal, the process ends.

The amount of light from the light emitting diode (4) is controlled as follows (see FIG. 4).

First, in step 31, an A/D converted value obtained by A/D converting the output of the light emitting diode (4) is read. This A/
The D conversion value corresponds to the amount of light from the light emitting diode (4). Next, compare this A/D conversion value and the control target value,
If the A/D conversion value is equal to the target value in step 32, there is no need to change the amount of light, so the process ends; if not, the process proceeds to step 33. and,
If the A/D conversion value is smaller than the target value in step 33, proceed to step 34, and increase the D/A output value output to the light emitting diode (4) through the D/A converter in order to increase the amount of light. After that, the process is finished and the A/D
If the converted value is larger than the target value, the process proceeds to step 35, where the D/A output value is reduced to reduce the amount of light, and then the process is terminated.

The dot density is controlled as follows (see FIG. 5).

In the laser printer of this example, the dip switch (
5) Set the dot density to 300DPI and 400DPI
First, step 41
In step 42, the state of the dip switch (5) is input, and in step 42, the state of the dip switch (5) is checked. Then, the state of dip switch (5) is 300D.
In the case of PI, the polygon mirror control value is set to 300 DPI in step 43, the dot clock is set to 300 DPI in step 44, and the process is ended. Also, the state of dip switch (5) is 400DP.
In the case of I, the polygon mirror control value is set to 400 DPI in step 45, the dot clock is set to 400 DPM in step 46, and the process is ended.

Effects of the Invention According to the laser printer of the present invention, as described above, the circuit is simplified and the cost is reduced.

[Brief explanation of drawings]

FIG. 1 is an electric block diagram of a part of a laser printer showing an embodiment of the present invention, FIG. 2 is a flowchart showing an example of PWM control of the main motor, and FIG. 3 is an example of fixing temperature control. FIG. 4 is a flowchart showing an example of controlling the amount of light from a light emitting diode, and FIG. 5 is a flowchart showing an example of controlling dot density. (1) Computer, (2) Main motor, (3) Fixing heater, (4) Light emitting diode, (5) Deep switch, (6) ...Polygon mirror drive motor.

Claims (1)

[Claims] A recording apparatus characterized in that a main motor, fixing temperature, light intensity of a light emitting diode, polygon mirror drive motor, and dot density are controlled by a computer.