JP2004059179A - Detecting device, recording device and method for detecting recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect a recording medium, even when a change of a secular characteristic of an optical sensor, a change of a characteristic due to a difference of an ambient temperature environment and performance deterioration by paper powder exist. <P>SOLUTION: This detecting device is provided with a plurality of kinds of sensors 11 and 12 for detecting voltage signals for carried recording media, a selection circuit 13 for selecting the kind of the sensor 11 or 12 to be used according to kind 20 or 30 of the recording medium, a control part 18 for determining threshold voltage for detecting the recording medium according to the detection signal of the sensor selected by the selection circuit 13, and a comparison circuit 15 for comparing the detection signals of the sensors 11 and 12 and the threshold voltage determined by the control part 18 to detect the recording medium. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recording apparatus, a detection apparatus for detecting a recording medium in the apparatus, and a method for detecting a recording medium, and more particularly to a recording medium detection apparatus using an optical sensor and a recording apparatus using the apparatus. Things.
[0002]
[Prior art]
<Detection of tag paper>
For example, tag paper may be used as the paper passing through the recording device. In this case, a mark is printed on the non-recording surface of the tag paper, and a reflective sensor is used to detect this paper. Is used to detect marks on the non-recording surface.
[0003]
<Detection of label paper>
In some cases, label paper is used as a recording medium.In this case, a transmissive sensor is used instead of a reflective sensor to identify the gap between the label part of the label paper and the separator mount. The configuration is adopted.
[0004]
[Problems to be solved by the invention]
However, there is a change in sensor characteristics due to deterioration with time or an ambient temperature environment affecting characteristics specific to the sensor, and further, a voltage output from the reflection sensor 11 due to paper dust generated when tag paper is continuously used. Despite the presence of the recording medium, the output voltage Voh of the tag portion does not become lower than the threshold voltage Vth set by the comparison circuit. In some cases.
[0005]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-described problems, and has a difference in characteristics of a recording medium to be detected, a change in characteristics over time of a sensor, a change in characteristics due to a difference in an ambient temperature environment, and It is an object of the present invention to provide a detection device and the like that reliably detect a recording medium even when performance is deteriorated due to paper dust or the like.
[0006]
That is, a detection device according to the present invention that achieves the above object includes a plurality of types of sensors that detect a voltage signal for a conveyed recording medium,
A selection circuit for selecting a type of the sensor to be used, according to a type of the recording medium;
A control unit that determines a threshold voltage for detecting the recording medium according to a detection signal of the sensor selected by the selection circuit;
A comparison circuit that compares the detection signal of the sensor with a threshold voltage determined by the control unit and detects the recording medium;
It is characterized by having.
[0007]
Preferably, in the above detection device, the sensor detects a signal for a different portion of the recording medium,
The control unit determines the threshold voltage by averaging signals for the different portions.
[0008]
Preferably, in the above detection device, the control unit includes a conversion table that stores data for determining the threshold voltage,
Based on a signal detected by the sensor, data stored in the conversion table is collated to determine a threshold voltage.
[0009]
Preferably, in the above detection device, the sensor includes an optical sensor having a light emitting element and a light receiving element, the light emitting element receives reflected light projected on the recording medium, the light receiving element receives the reflected light, It outputs a voltage signal for the recording medium.
[0010]
Preferably, in the above detection device, the sensor includes an optical sensor having a light emitting element and a light receiving element, and the light emitting element receives transmitted light projected on the recording medium, and the light receiving element receives the transmitted light. It outputs a voltage signal for the recording medium.
[0011]
Preferably, in the detection device described above, the control unit sets the determined threshold voltage in the comparison circuit as an initial value in a next recording operation.
[0012]
Further, a recording apparatus according to the present invention that achieves the above object, a conveying unit for conveying a recording medium,
A detection device that detects the recording medium conveyed by the conveyance unit,
Recording means for recording the recording data based on the detection of the detection device,
A plurality of types of sensors, wherein the detection device detects a voltage signal for a conveyed recording medium;
A selection circuit for selecting a type of the sensor to be used, according to a type of the recording medium;
A control unit that determines a threshold voltage for detecting the recording medium according to a detection signal of the sensor selected by the selection circuit;
A comparison circuit that compares the detection signal of the sensor with a threshold voltage determined by the control unit and detects the recording medium.
[0013]
Further, a method for detecting a recording medium according to the present invention that achieves the above object includes a detecting step of detecting voltage signals output from a plurality of types of sensors for a conveyed recording medium,
A control step of a selection circuit for selecting the type of the sensor to be used, according to the type of the recording medium;
A threshold control step of determining a threshold voltage for detecting the recording medium according to a detection signal of the sensor selected by the selection circuit;
A comparing step of comparing the detection signal of the sensor with a threshold voltage determined by the processing of the threshold control step to detect the recording medium.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail based on a plurality of embodiments.
[0015]
In order to effectively perform the recording control, a configuration is adopted in which a detection device including various sensors is provided in a transport path for transporting the recording medium to detect the recording medium. FIG. 6 is an external view of a label printer in which a detection device is incorporated, and FIG. 7 is a schematic configuration diagram showing an arrangement of a transport mechanism and a sensor group in the label printer. As shown in FIG. 6, the label printer detects the recording medium (roll paper) 709 conveyed by the entrance reflection type sensor 11-1 and the entrance transmission type sensor 12-1, and the detection result is used as a trigger for recording start. Become. The transport motor 703 drives the transport belt 715 to transport the recording medium, and the recording apparatus performs recording at a predetermined position by the recording unit. An exit transmission type sensor 12-2 and an exit reflection type sensor 11-2 are provided in the ejection direction of the recording medium, and the presence or absence of ejection or retention of the recording medium is detected.
[0016]
FIG. 8 is a block diagram showing a configuration of a control circuit of the printing apparatus. In the figure showing a control circuit, 1700 is an interface for inputting a recording signal, 1701 is an MPU, 1702 is a control program executed by the MPU 1701, for example, a control program corresponding to the flow shown in FIGS. 3 and 4, and a table shown in FIG. A ROM 1703 stores various data (such as the recording signal and recording data supplied to the head). A gate array (GA) 1704 controls supply of print data to the print head, and also controls data transfer between the interface 1700, the MPU 1701, and the RAM 1703. Reference numeral 1709 denotes a transport motor for transporting the recording medium. Reference numeral 1705 denotes a head driver for driving the recording head, and 1706 denotes a motor driver for driving the transport motor 1709. 1710 is D / A, and 1711 is A / D. Reference numerals 1712 and 1713 denote sensor drivers, which are an entrance transmission sensor 1714 (corresponding to 12-1 in FIG. 6), an entrance reflection sensor 1715 (corresponding to 11-1 in FIG. 6), and an exit transmission sensor 1716 (FIG. 6). 11-2) and the exit reflection type sensor 1717 (corresponding to 12-2 in FIG. 6) are connected.
[0017]
The operation of the above control configuration will be described. When a print signal enters the interface 1700, the print signal is converted into print data between the gate array 1704 and the MPU 1701. Then, the motor driver 1706 is driven, and the recording head is driven according to the recording data sent to the head driver 1705 to perform recording.
[0018]
In this example, the control program executed by the MPU 1701 is stored in the ROM 1702. However, an erasable / writable storage medium such as an EEPROM is further added, and the control program is changed from a host computer connected to the inkjet printer IJRA. It can be configured to be able to do so. Next, a description will be given of a recording medium detection device having the above configuration.
[0019]
<First embodiment>
FIG. 1 is a circuit configuration diagram of a recording medium detection device according to the present embodiment, and FIG. 2 is a diagram illustrating a relationship between time and voltage of the optical sensor in FIG. FIG. 3 is a flowchart illustrating a process for detecting tag paper according to the present embodiment.
[0020]
The reflection-type sensor 11 and the transmission-type sensor 12 are configured in a detection device, and each of the reflection-type sensor and the transmission-type sensor includes a light-emitting diode (11a, 12a) and a phototransistor (11b, 12b). For example, when tag paper is detected, light emitted by the light emitting diode 11a is reflected by the tag paper and received by the phototransistor 11b. The comparison circuit 15 compares the light receiving voltage level of the phototransistor with a predetermined threshold voltage. When tag paper is used as a recording medium, the output voltage of the phototransistor differs depending on the difference in reflectance between the tag portion and the mark portion. For example, the light receiving level voltage Voh of the phototransistor 11b changes depending on the output voltage Vc for detecting the tag portion and the output voltage Vd for detecting the mark printed portion. The tag portion and the mark portion are determined by comparing the magnitude relationship between the light receiving level voltage Voh and the threshold voltage Vth.
[0021]
In this case, the comparison circuit 15
Voh (= Vc) <Vth (with paper) (1)
Voh (= Vd)> Vth (no paper) (2)
Judge.
[0022]
When detecting label paper, light emitted by the light emitting diode 12a passes through the label paper and is received by the phototransistor 12b. A volume resistor (14) for determining the gain resistance is connected to the collector of the phototransistor (11b), and a volume resistor (16) is connected to the emitter of the phototransistor (12b).
[0023]
The comparison circuit 15 compares the light receiving voltage level of the phototransistor with a predetermined threshold voltage. When label paper is used for recording, the output voltage of the phototransistor differs depending on the difference in light transmittance between the label portion and the separator mount portion. For example, the light receiving level voltage Vot of the phototransistor 12b changes depending on an output voltage value Va for detecting a label portion and an output voltage Vb for detecting a separator mount portion. The label portion and the separator portion are determined by comparing the magnitude relationship between the light receiving level voltage Vot and the threshold voltage Vth.
[0024]
In this case, the comparison circuit 15 sets the threshold voltage Vth such that Va <Vth <Vb,
Vot (= Va) <Vth (with paper) (3)
Vot (= Vb)> Vth (no paper) (4)
Was determined.
[0025]
The output signal of the selection circuit 13 is input to the A / D converter 18a of the microcomputer control unit 18 separately from the output of the comparison circuit 15, and the analog sensor output data is converted into digital data. The microcomputer control unit calculates a threshold voltage based on the measurement result, converts the result by the D / A converter 18b, and sets the calculated threshold voltage Vth in the comparison circuit 15.
[0026]
Hereinafter, the process of determining the threshold voltage will be described.
[0027]
<Determination of threshold voltage>
Here, a procedure for determining the threshold voltage Vth used by the comparison circuit 15 to determine the presence or absence of a recording medium will be described with reference to FIGS. 2A and 3. Referring to FIG. 7 as an enlarged view of the transport system of FIG. 6, when a recording medium (in this case, a tag sheet is described as an example) passes through the paper passage path 19 of FIG. Output waveforms as shown in FIG. 2A (b) are output from (11-1, 11-2). In FIG. 2A (b), the horizontal axis represents time, and the vertical axis represents the output voltage of the sensor. When the tag paper passes through the paper passage path 19, a portion 31 on which no mark is printed (FIG. 2A (a) )), And the voltage value Vd of the mark-printed portion is output. FIG. 2A (c) is a diagram in which the output waveform corresponding to FIG. 2A (b) is converted into a pulse wave, and reference numerals 201 to 203 are rectangular waves corresponding to the mark-printed portions in FIG. 2A (a). Is equivalent to
[0028]
Next, the flow of the threshold value determination process in the detection of the recording medium will be described with reference to the flowchart of FIG. First, when the label printer conveys the tag paper 30 (FIG. 2A (a)) and starts recording (step S101), the D / A converter 18b (FIG. 8) in the microcomputer controller 18 (corresponding to the MPU 1701 in FIG. 8). (Corresponding to D / A) is determined in the previous recording, and the threshold voltage Vth stored in the memory is output to the comparison circuit 15 (step S102). However, in this case, if the recording operation is the first recording after unpacking the printer, the default value stored in the shipment inspection at the factory is output.
[0029]
When the tag paper 30 starts to pass through the paper passage path 19, the tag paper print portion 31 and the mark print portion 32 alternately pass over the reflective sensor 11 (FIG. 2A (a)). Can be detected respectively (FIGS. 2A (b) and (c)). Then, the output voltage is input to the comparison circuit 15.
[0030]
Based on the output voltage (Vc or Vd) and the threshold voltage Vth in the previous recording, the presence / absence of a recording medium and the identification of the tag paper print portion 31 and the mark print portion 32 are determined. This determination is determined based on the above equations (1) and (2).
[0031]
If it is determined that there is a recording medium (in this case, tag paper) (S103-Yes), the process proceeds to step S104, and the output voltage value Vc corresponding to the tag paper print portion 31 (the portion where the mark is not printed) is determined. The microcomputer control unit 18 reads the data via the A / D converter 18a (S104).
[0032]
Next, when it is determined that the detected portion corresponds to the mark print portion 32 (S105-Yes), the process proceeds to step S106, and the microcomputer 18 determines the output voltage value Vd at that time by the A / D converter 18a (A / D in FIG. 8). (Corresponding to D.)) (S106).
[0033]
In step S107, D / A conversion is performed by the D / A converter 18b based on the sensor output voltages (Vc, Vd) input to the A / D converter 18a of the microcomputer control unit 18, and the threshold voltage is calculated by the equation (5). Vth is required.
[0034]
Vth = (Vc + Vd) / 2 (5)
The microcomputer control unit 18 executes the calculation of the expression (5) and stores the calculation result in a memory (not shown) (S107). If it is determined that the image does not correspond to the mark print portion (S105-No), the process returns to step S104, and the measurement of the output voltage Vc is continued.
[0035]
After the recording is completed (step 108), when another image data is to be recorded, the calculation result of step S107 is reflected, the threshold voltage is updated to the latest value, and the process is newly performed in step S101. Will be returned.
[0036]
By calculating the threshold voltage based on the measurement data corresponding to the tag paper print portion 31 and the mark print portion 32 and updating the setting of the comparison circuit 15, a detection waveform as shown in FIG. 2A (b) is obtained. It is possible to accurately detect the recording medium.
[0037]
That is, the processing steps shown in FIG. 3 are sequentially executed at the time of recording, and a threshold voltage reflecting the characteristics of the sensor is set. It is possible to reliably detect a sheet even when there is a change in characteristics due to a difference in the ambient temperature environment and a performance deterioration due to paper dust or the like.
[0038]
Further, the detecting device is provided at the entrance of the paper passage path 19 of the recording device and detects the recording medium which is conveyed. Further, this detecting device is disposed at the exit of the recording device, It is also possible to monitor a paper jam of a recording medium.
[0039]
<Second embodiment>
In the above-described first embodiment, the setting of the threshold value is described by taking the detection of the tag paper as an example. However, even when the recording medium is label paper, the threshold value is similarly updated based on the sensor output. It is possible to set.
[0040]
When the label paper 20 (FIG. 2B (a)) passes through the paper passage path 19 in FIG. 7, the transmission sensor 12 (12-1, 12-2) outputs an output waveform as shown in FIG. 2B (b). You. In FIG. 2B (b), the horizontal axis represents time, and the vertical axis represents a waveform indicating the output voltage of the sensor. When the tag paper passes through the paper passage path 19, the label paper 21 corresponds to the label paper 21 (FIG. 2B (a)). The output voltage value Va and the voltage value Vb of the separator mount portion 22 are output. FIG. 2B (c) is a diagram in which the output waveform corresponding to FIG. 2B (b) is converted into a pulse wave, and reference numerals 204 to 206 correspond to rectangular waves corresponding to the separator mount 22 in FIG. 2B (a). I do.
[0041]
Based on the output voltages of these sensors, the processing steps shown in FIG. 3 are sequentially executed at the time of recording, and it becomes possible to set a threshold voltage reflecting the characteristics of the sensors. According to such a configuration, even when there is a change in characteristics over time of the optical sensor used for detecting the label paper, a change in characteristics due to a difference in the ambient temperature environment, and a performance deterioration due to paper dust or the like. The paper can be reliably detected.
[0042]
<Third embodiment>
In the present embodiment, a process of determining the threshold voltage based on a conversion table in which the relationship between the detection voltage of the sensor and the threshold voltage is determined in advance instead of determining the threshold value by sequential calculation will be described.
[0043]
FIG. 4 is a flowchart illustrating a flow of a process for determining a threshold voltage Vth for detecting a recording medium according to the third embodiment.
[0044]
In step S301, it is determined whether the label printer performs recording using the tag paper 30 (FIG. 2A (a)) or performs recording using the label paper 20 (FIG. 2B (a)). For example, when recording is performed using the tag paper 30 (S301-reflective sensor, S302), the threshold voltage Vth determined by the previous recording process and stored in the memory (not shown) is calculated by the D / D of the microcomputer control unit 18. The signal is output from the A converter 18b to the comparison circuit 15 (S303).
[0045]
When the tag paper 30 starts to be conveyed along the paper passage path 19 (FIG. 7), the tag paper print portion 31 and the mark print portion 32 (FIG. 2A (a)) alternately pass over the reflective sensor 11, and Are obtained as shown in FIGS. 2A (b) and 2 (c).
[0046]
If it is determined that there is a recording medium (in this case, tag paper) (S304-Yes), the process proceeds to step S305, and the output voltage value Vc corresponding to the tag paper print portion 31 (the portion where no mark is printed) is determined. The microcomputer control unit 18 reads the data via the A / D converter 18a (S305).
[0047]
When the output voltage value Vc is not within the range of the specified voltage 0.2 (V) ≦ Vc ≦ 3.5 (V) (S306-No), the microcomputer control unit 18 determines that the measurement value of the sensor is an error. Then, the operator can be notified of the sensor abnormality (S309).
[0048]
On the other hand, when the output voltage value Vc falls within the specified voltage range (S306-Yes), the data of the threshold voltage conversion chart (FIG. 5) for the voltage value Vc stored in advance in the memory of the microcomputer control unit 18 The predetermined threshold voltage Vth is determined by collation. Then, a threshold voltage Vth corresponding to the output voltage value Vc read from the D / A converter 18b is output (S307).
[0049]
A conversion chart of the voltage value of the threshold voltage Vth with respect to the voltage value of Vc stored in advance in the memory of the microcomputer 18 has, for example, a configuration as shown in FIG. Near storage data is selected, the threshold voltage is determined, and the threshold voltage Vth selected from the conversion chart is set in the comparison circuit 15. By determining the threshold voltage based on the output voltage Vc corresponding to the tag paper print portion 31 and updating the setting of the comparison circuit 15, a detection waveform as shown in FIG. Can be performed accurately.
[0050]
In the above-described steps S304 to S307, the processing of determining the threshold voltage based on the detection result of the printed portion of the tag paper has been described as an example, but the gist of the present invention is limited to this embodiment. Instead, a threshold voltage conversion chart as shown in FIG. 5 is prepared in advance based on the detection result of the mark printed portion of the tag paper, so that the threshold voltage can be determined according to the same processing.
[0051]
When printing is performed using the label paper 20 (FIG. 2B (a)) by selecting the sensor in step S301 (S301-transmission type sensor, S202), the printing is determined by the previous printing process and stored in a memory (not shown). The threshold voltage Vth is output from the D / A converter 18b of the microcomputer control unit 18 to the comparison circuit 15 (S203).
[0052]
As the label paper 20 starts to be conveyed along the paper passing path 19 (FIG. 7), the label paper portion 21 and the separator backing portion 22 (FIG. 2B (a)) alternately pass between the transmissive sensors 12, and The sensor output voltage is obtained as shown in FIGS. 2B (b) and 2 (c). If it is determined that there is a recording medium (label paper in this case) (S204-Yes), the process proceeds to step S205, and the microcomputer control unit 18 sends the output voltage value Va corresponding to the label paper portion 21 to the A / D converter 18a. (S205).
[0053]
If the output voltage value Va does not fall within the range of the specified voltage 0.2 (V) ≦ Va ≦ 3.5 (V), the microcomputer control unit 18 executes the above-described error processing (S309).
[0054]
On the other hand, when the output voltage value Va falls within the range of the specified voltage (S206-Yes), the data of the threshold voltage conversion chart (not shown) for the voltage value Va stored in advance in the memory of the microcomputer control unit 18 and The predetermined threshold voltage Vth is determined by collation. Then, a threshold voltage Vth corresponding to the output voltage value Vc read from the D / A converter 18b is output (S207).
[0055]
Through the above processing, the threshold voltage Vth selected from the conversion chart is set in the comparison circuit 15. By determining the threshold voltage based on the output voltage Va corresponding to the label paper portion 21 and updating the setting of the comparison circuit 15, a detection waveform as shown in FIG. 2B (b) is obtained, and the detection of the recording medium is performed. It is possible to do it accurately.
[0056]
In the processing of steps S204 to S207 described above, the processing of determining the threshold voltage based on the detection result of the label paper portion has been described as an example, but the gist of the present invention is not limited to this embodiment. Alternatively, by preparing a threshold voltage conversion chart as shown in FIG. 5 in advance based on the detection result of the separator mount, it is possible to determine the threshold voltage according to the same processing.
[0057]
Further, in the present embodiment, the voltage in the specified range is exemplified in the range of 0.2 V to 3.5 V, but the gist of the present invention is not limited to this numerical range, and the sensor used is not limited to this range. It is needless to say that various settings can be made according to the individual characteristics of.
[0058]
<Other embodiments>
The present invention can be applied to a system including a plurality of devices (for example, a host computer, an interface device, a reader, a printer, etc.), or to an apparatus including one device (for example, a copying machine, a facsimile machine, etc.). May be.
[0059]
【The invention's effect】
As described above, according to the present invention, differences in the characteristics of the recording medium to be detected, changes in the characteristics over time of the sensor, changes in the characteristics due to differences in the ambient temperature environment, and performance degradation due to paper dust and the like are caused. Even in some cases, it is possible to reliably detect the recording medium.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a circuit configuration of a detection device according to an embodiment.
FIG. 2A is a diagram illustrating detection of a tag sheet.
FIG. 2B is a diagram illustrating detection of a label sheet.
FIG. 3 is a flowchart illustrating a process of detecting a tag sheet.
FIG. 4 is a flowchart illustrating a flow of a process of determining a threshold voltage Vth for detecting a recording medium according to a third embodiment.
FIG. 5 is a diagram illustrating a configuration of a threshold voltage conversion chart with respect to a voltage value Vc.
FIG. 6 is an external view of a label printer in which a detection device is incorporated.
FIG. 7 is a schematic configuration diagram illustrating an arrangement of a transport mechanism and a sensor group in the label printer.
FIG. 8 is a block diagram illustrating a control configuration of the printing apparatus.
[Explanation of symbols]
11: Reflective sensor 11a: Light emitting diode 11b of reflective sensor: Phototransistor 12 of reflective sensor: Transmissive sensor 12a: Light emitting diode 12b of transmissive sensor: Phototransistor 13 of transmissive sensor 13: Sensor selection circuit 14: Volume Resistance (for determining reflective sensor gain)
15: Comparison circuit 16: Volume resistance (for determining transmission sensor gain)
18: Microcomputer 18a: A / D converter 18b built in microcontroller 18: D / A converter 19 built in microcontroller 19: Paper passing path 20: Label paper 21: Separator board section 22: Label paper printing section 30 : Tag paper 31: Tag paper printing unit 32: Mark printing unit on the non-printing side of tag paper

Claims (8)

A plurality of types of sensors for detecting a voltage signal for the conveyed recording medium;
A selection circuit for selecting a type of the sensor to be used, according to a type of the recording medium;
A control unit that determines a threshold voltage for detecting the recording medium according to a detection signal of the sensor selected by the selection circuit;
A comparison circuit that compares the detection signal of the sensor with a threshold voltage determined by the control unit and detects the recording medium;
A detection device comprising: The sensor detects signals for different portions of the recording medium,
The detection device according to claim 1, wherein the control unit determines the threshold voltage by averaging signals for the different portions. The control unit includes a conversion table that stores data for determining the threshold voltage,
2. The detection device according to claim 1, wherein a threshold voltage is determined by comparing data stored in the conversion table based on a signal detected by the sensor. The sensor includes an optical sensor having a light-emitting element and a light-receiving element, the light-emitting element outputs reflected light projected on the recording medium, the light-receiving element receives and outputs a voltage signal for the recording medium, The detection device according to claim 1, wherein: The sensor includes an optical sensor having a light-emitting element and a light-receiving element, the light-emitting element transmits transmitted light projected on the recording medium, the light-receiving element receives and outputs a voltage signal for the recording medium, The detection device according to claim 1, wherein: The detection device according to claim 1, wherein the control unit sets the determined threshold voltage as an initial value in a next recording operation in the comparison circuit. Conveying means for conveying the recording medium,
A detection device that detects the recording medium conveyed by the conveyance unit,
Recording means for recording the recording data based on the detection of the detection device,
A plurality of types of sensors, wherein the detection device detects a voltage signal for a conveyed recording medium;
A selection circuit for selecting a type of the sensor to be used, according to a type of the recording medium;
A control unit that determines a threshold voltage for detecting the recording medium according to a detection signal of the sensor selected by the selection circuit;
A recording apparatus, comprising: a comparison circuit that compares the detection signal of the sensor with a threshold voltage determined by the control unit and detects the recording medium. A detection step of detecting voltage signals output from a plurality of types of sensors for the conveyed recording medium,
A control step of a selection circuit for selecting the type of the sensor to be used, according to the type of the recording medium;
A threshold control step of determining a threshold voltage for detecting the recording medium according to a detection signal of the sensor selected by the selection circuit;
A comparison step of comparing the detection signal of the sensor and a threshold voltage determined by the processing of the threshold control step, and detecting the recording medium;
A method for detecting a recording medium, comprising:

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