WO2004102167A1 - レインセンサ用の信号検出回路および信号検出方法 - Google Patents
レインセンサ用の信号検出回路および信号検出方法 Download PDFInfo
- Publication number
- WO2004102167A1 WO2004102167A1 PCT/JP2004/006756 JP2004006756W WO2004102167A1 WO 2004102167 A1 WO2004102167 A1 WO 2004102167A1 JP 2004006756 W JP2004006756 W JP 2004006756W WO 2004102167 A1 WO2004102167 A1 WO 2004102167A1
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- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- signal
- component
- threshold voltage
- pulse
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
- B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
- B60S1/0818—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like
- B60S1/0822—Wipers or the like, e.g. scrapers characterised by the drive electrically driven including control systems responsive to external conditions, e.g. by detection of moisture, dirt or the like characterized by the arrangement or type of detection means
- B60S1/0833—Optical rain sensor
Definitions
- the present invention relates to a signal detection circuit used for a rain sensor that is a raindrop detection device for controlling a wiper that removes raindrops and the like on a windshield of a vehicle, and particularly to a signal detection circuit that can resolve an input signal from a light receiving element.
- the present invention relates to a signal detection circuit including a resolution improving circuit for increasing the signal.
- the present invention further relates to a method for increasing the resolution of an input signal in a rain sensor. Background technology
- a general rain sensor lights a light-emitting element such as a light-emitting diode (LED) at a fixed cycle, irradiates the pulse light from the light-emitting element to a windshield (front glass), and reflects the reflected light.
- a light-emitting element such as a light-emitting diode (LED)
- LED light-emitting diode
- a light-receiving element such as (PD)
- Pulse signal the output signal of the PD
- raindrops are detected and the amount of raindrops attached is measured, and finally the rainfall level is measured.
- Figure 1 shows the signal detection mechanism of the lane sensor.
- the pulse light 11 from the LED 10 passes through the lens 12 and the prism 14, is reflected by the surface of the front glass 16, passes through the prism 14 and the lens 18, and enters the PD 20.
- a signal detection circuit for detecting a pulse signal output from a PD generally includes an analog circuit and a microcomputer. In current rain sensors, microcomputers are implemented in this way, and signal components are processed by software.
- FIG. 2 shows an example of such a signal detection circuit.
- the analog circuit 22 includes a current-voltage (I-V) conversion circuit 24, a band-pass filter circuit / amplifier circuit 26, and a peak hold circuit 30.
- the pulse signal obtained from the PD is converted from a change in current value to a change in voltage value through an IV conversion circuit 24.
- the output of the I-V conversion circuit 24 passes through a band-pass filter circuit Z-amplification circuit 26 to remove noise components and is amplified according to the input width of the A / D converter 34 of the microcomputer 32.
- the peak value of the amplified pulse signal is held by the peak hold circuit 30. The held peak value is sent to the microcomputer 32.
- the microcomputer 32 processes the digital value obtained from the AZD converter 34 by software, obtains raindrop information, and determines a rainfall level from the raindrop information.
- the fact that the output obtained from the PD is reduced to less than half means that if signal processing is performed with conventional analog circuits and microcomputers, the resolution will be reduced to less than half. Reducing the resolution to less than half means that signal changes due to the attachment of raindrops are difficult to find, making it difficult to maintain the detection performance of conventional rain sensors.
- the AZD comparator has 10 bits
- the AZD comparator has a digital value (0 to 10 bits) of 10 bits for a voltage input range of 0 V to 5 V. 2 Output in 3). Therefore, to increase the resolution, an AZD converter larger than 10 bits (for example, 11 bits, 12 bits,...) Is used.
- an object of the present invention is to provide a signal detection circuit and method for a rain sensor, in which the resolution of an AZD converter is increased without changing the resolution of an analog circuit.
- Still another object of the present invention is to provide a resolution improving circuit for increasing the resolution in a signal detection circuit for a ray sensor.
- a pulse light from a light emitting element is irradiated to a windshield of the vehicle, reflected light is received by a light receiving element, and a pulse signal from the light receiving element is processed.
- a signal detection circuit input to the arithmetic processing device wherein the current-to-voltage conversion circuit converts a pulse signal from the light emitting element into a voltage signal; and reduces noise of an output signal of the current-to-voltage conversion circuit;
- a bandpass filter / amplifier circuit for amplifying an output signal, and a resolution improvement circuit for increasing the resolution by dividing the output signal of the bandpass filter / amplifier circuit.
- the resolution improving circuit includes a bandpass filter circuit, an output signal of one pulse light from the Z amplifier circuit, and a predetermined threshold voltage. Dividing the first component of the above with a predetermined threshold voltage or less of the second component, holds the peak value of the first and second components.
- the method using one pulse light in this way is referred to as a one-time lighting method. In this one-time lighting method, the number of input terminals (channels) of the microcomputer's AZD converter is two.
- the resolution improving circuit of the second aspect is a band pass filter circuit using two consecutive pulsed lights from the band pass filter circuit / amplifier circuit.
- the two consecutive first and second output signals from the Z amplifier circuit. Baby That is, a second component having a predetermined threshold voltage or higher is extracted from the first output signal, a first component having a predetermined threshold voltage or higher is extracted from the second output signal, and the first and second components of the first and second components are extracted. Hold the peak value.
- the method using two consecutive pulsed lights is referred to as a two-time lighting method. In this double lighting method, the number of input terminals (channels) of the microcomputer's A / D converter is one.
- the one-time lighting resolution improvement circuit consists of a threshold voltage setting circuit that sets a predetermined threshold voltage, a band-pass filter circuit, and a threshold voltage that is lower than the threshold voltage of the second output signal from the Z amplifier circuit.
- a high-pass filter circuit that cuts off the DC component of the output signal from the mask circuit, and an output switching switch that switches and outputs the output from the high-pass filter circuit and the first output signal.
- the resolution improvement circuit of the two-time lighting method includes a threshold voltage setting circuit that sets a predetermined threshold voltage, a mask circuit that masks a component of the second pulse signal that is equal to or lower than the threshold voltage, and the mask A high-pass filter circuit for cutting the DC component of the output signal from the circuit, an output switch circuit for switching between the output from the high-pass filter circuit and the first pulse signal, and an output switch switch A second amplifier circuit for amplifying an output signal of the circuit; and a peak hold circuit for holding a peak value of the output signal of the second amplifier circuit.
- FIG. 1 is a diagram showing a signal detection mechanism of the rain sensor.
- FIG. 2 is a diagram illustrating a signal detection circuit.
- Fig. 3 is a block diagram of the high-resolution circuit for the one-time lighting method.
- FIG. 4 is a diagram showing a specific circuit configuration of the resolution improving circuit of FIG.
- FIGS. 5A and 5B are diagrams for explaining how to output a signal component equal to or higher than the threshold voltage and equal to or lower than the threshold voltage.
- FIG. 6 is a diagram illustrating a signal detection circuit provided with a resolution improvement circuit.
- FIG. 7 is a timing chart for explaining the operation when the pulse signal from the band-pass filter circuit is below the threshold voltage.
- FIG. 8 is a timing chart for explaining the operation when the pulse signal from the band-pass filter circuit Z amplifier circuit is equal to or higher than the threshold voltage.
- Fig. 9 is a block diagram of the resolution improvement circuit in the case of the double lighting method.
- FIG. 10 is a diagram showing a specific circuit configuration of the resolution improving circuit of FIG.
- Fig. 11 is a diagram showing a signal detection circuit provided with a resolution improvement circuit.
- Fig. 12 is a diagram illustrating the operation when the pulse signal from the band-pass filter circuit Z amplifier circuit is below the threshold voltage. This is a timing chart for
- FIG. 13 is a timing chart for explaining the operation when the pulse signal from the band-pass filter circuit Z amplifier circuit is equal to or higher than the threshold voltage.
- FIG. 3 is a block diagram of the resolution improving circuit 38 in the case of the single lighting method.
- This resolution improvement circuit sets a predetermined threshold voltage, A threshold voltage setting circuit 40, a mask circuit 42 that masks components below the threshold voltage, and a high-pass filter circuit 44 that cuts off the DC component of the signal and outputs a component above the threshold voltage.
- An amplifier circuit 46 for amplifying a component equal to or higher than the threshold voltage a peak hold circuit 48 for holding a peak of the output of the amplifier circuit, and an amplifier circuit 50 for amplifying a component equal to or lower than the threshold voltage.
- a peak hold circuit 52 for holding the peak of the output of the amplifier circuit.
- FIG. 4 shows a specific circuit configuration of the resolution improving circuit in FIG.
- the high-pass filter circuit 44 and the peak hold circuits 48, 52 are provided with switch elements 54, 56, 58, respectively, which are turned on by a pulse driving the LED. , OFF are controlled.
- the function of the switch element 54 of the filter circuit 44 will be described later.
- the switch elements 56 and 58 of the peak hold circuits 48 and 52 function to discharge the capacitors 55 and 57, respectively, in preparation for the next peak hold operation.
- FIGS. 5A and 5B are diagrams for explaining how to output a signal component equal to or higher than the threshold voltage and equal to or lower than the threshold voltage.
- a signal is formed by masking components below the threshold voltage. When this signal is input to the high-pass filter circuit, components below the threshold voltage are cut off. Only the component exceeding the threshold voltage is amplified by the amplifier circuit 46.
- the signal components below the threshold voltage are directly amplified by the amplifier circuit 50.
- the amplified pulse signals have their peak values held by the peak hold circuits 48 and 52, respectively. All of the held peak values are within the voltage input range of the A / D comparator 34 of the microphone computer 32.
- the above-described resolution improving circuit is used in place of the peak hold circuit 30 of the signal detection circuit of FIG.
- FIG. 6 shows a signal detection circuit provided with a resolution improvement circuit 38.
- the pulse signal from the amplified PD output from the band-pass filter circuit Z amplifier circuit 26 is input to the resolution improving circuit 38.
- As the AZD converter 35 of the microcomputer 32 one having two input terminals CH 1 and CH 2 is used.
- FIG. 7 is a timing chart for explaining the operation when the pulse signal from the band-pass filter circuit Z amplifier circuit 26 is equal to or lower than the threshold voltage.
- A is the waveform of the input signal
- (b) is the waveform of the output signal above the threshold voltage
- (c) is the waveform of the output signal below the threshold voltage (in this example, no output signal)
- ( d) shows the waveform of the LED drive pulse.
- FIG. 8 is a timing chart for explaining the operation when the pulse signal from the band-pass filter circuit Z amplifier circuit 26 is equal to or higher than the threshold voltage.
- the waveforms (a), (b), (c), and (d) correspond to the waveforms in FIG. 7, respectively.
- the drive pulse of the LED has a period of 500 s and a pulse width of 12.8 s.
- the LED 10 lights up when the drive pulse is at the H level, and goes off when the drive pulse is at the L level. Therefore, the pulse signal from PD 20 is output in accordance with the H level of the LED driving pulse.
- the LED driving pulse is output from the switch element 54 of the high-pass filter circuit 44, and Used to turn on and off the switch elements 56 and 58 of the peak hold circuits 48 and 52.
- a threshold voltage is created by dividing the Vcc power supply (5 V) by two resistors 37 and 39.
- the threshold voltage is applied to the mask circuit 42.
- the mask circuit 42 also receives a pulse signal from the bandpass filter circuit / amplifier circuit 26.
- the threshold voltage is set as a DC component, that is, a signal in which the threshold voltage or less of the pulse signal is masked is formed.
- the threshold voltage of the masked pulse signal is removed by a high-pass filter circuit 44, and a signal component equal to or higher than the threshold voltage is input to the amplifier circuit 46.
- the high-pass filter circuit 44 is provided with the switch element 54, which is turned on and off by the LED drive pulse.
- the switch element 54 When the output of the mask circuit 42 passes through the high-pass filter circuit 44, a gradient component (high-frequency component) is output. As a result, the output value may drop below ground, that is, become negative. If a negative output value is input to the operational amplifier 45 of the amplifier circuit 46 and the negative output value falls below the lower limit of the input voltage range of the operational amplifier, the operational amplifier may be destroyed. To prevent this, only when the LED drive pulse is at the H level, the switch element 54 is turned off so that a negative output value is not applied to the operational amplifier 45.
- a gradient component high-frequency component
- the pulse signal from the band-pass filter circuit Z amplifier circuit 26 has a threshold voltage or lower as shown by the waveform (a) in FIG.
- the pulse signal is input to both the mask circuit 42 and the amplifier circuit 50.
- No signal is output from the amplifier circuit 46 as a result of the mask in the mask circuit 42 as shown by the waveform (b) in FIG.
- an amplified signal is output from the amplification circuit 50 as shown by a waveform (c) in FIG.
- the pulse signal from the bandpass filter circuit Z amplifier circuit 26 has a threshold voltage or more as shown in the waveform (a) of FIG. Since the pulse signal exceeds the saturation voltage of the amplifier circuit 50, the output from the amplifier circuit 50 has a collapsed waveform as shown in the waveform (c) of FIG.
- the waveform (b) in FIG. As described above, the components above the threshold voltage are amplified and output.
- the peak values of the output signals of the amplifier circuits 46 and 50 are held by peak hold circuits 48 and 52, respectively.
- the peak values are two A / D converters 35 of the microcomputer 32. Are sent to the input terminals CH 1 and CH 2 respectively.
- the AZD comparator 35 when the pulse signal from the PD is equal to or less than the threshold value, the signal is input only to the input terminal CH1, and the signal is converted into a digital value and output.
- the pulse signal from the PD is equal to or greater than the threshold value, the signal is input to both of the input terminals CH1CH2, and both are converted to digital values and output.
- the microcomputer only the digital value corresponding to CH2 is selected. '
- the resolution of the analog circuit can be increased while the resolution of the AZD converter remains unchanged.
- FIG. 9 is a block diagram of the resolution improving circuit 60 in the case of the double lighting method.
- a threshold voltage setting circuit 40 for setting a predetermined threshold voltage; a mask circuit 42 for masking a component below the threshold voltage; and a high-pass filter circuit 44 for cutting a DC component of a signal.
- An output switching switch circuit 62 for switching between a component below the threshold voltage and the output of the high-pass filter circuit; an amplifier circuit 63 for amplifying the output of the switching switch circuit; and a peak of this amplifier circuit.
- a peak hold circuit 65 for holding the value.
- FIG. 10 shows a specific circuit configuration of the resolution improving circuit of FIG.
- the threshold voltage setting circuit 40, the mask circuit 42, the high-pass fill circuit 44, the amplifier circuit 63, and the peak hold circuit 65 are the same as those in FIG.
- the output switching switch circuit 62 is composed of an inverter 64 and two switch elements 66, 68. These switch elements include The pulse signal from the band-pass filter circuit 26 and the pulse signal from the high-pass filter circuit 4.4 are input.
- the switch element 66 is inserted in a path through which the pulse signal from the band-pass filter circuit amplifying circuit 26 passes, and the switch element 68 is inserted into a path through which the output signal from the high-pass filter circuit 44 passes. ing.
- FIG. 11 shows a signal detection circuit provided with a resolution improvement circuit 60.
- the AZD converter 34 of the micro computer 32 uses an AZD converter with one input terminal, similar to the conventional signal detection circuit shown in Fig. 2.
- FIG. 12 is a timing chart for explaining the operation when the pulse signal from the band pass filter amplifier circuit 26 is equal to or lower than the threshold voltage.
- FIG. 13 is a timing chart for explaining the operation when the pulse signal from the band-pass filter circuit Z amplifier circuit 26 is equal to or higher than the threshold voltage.
- A shows the waveform of the input signal
- (b) shows the waveform of the output signal below the threshold voltage
- (c) shows the waveform of the LED drive pulse
- (d) shows the waveform of the switch switching control signal. ing.
- the switch switching control signals shown in the waveform (d) of FIG. 12 and the waveform (d) of FIG. 13 turn on the two switch elements 66 and 68 of the output switching circuit 12, This signal is turned off.
- the switching control signal is at the H level
- the switch element 66 is turned on
- the switch element 68 is turned off
- the pulse signal from the bandpass filter circuit amplifier circuit 26 is output.
- the switching control signal is at the L level
- the switch element 66 is turned off, the switch element 68 is turned on, and the signal from the high-pass filter circuit 44 is output.
- the drive pulse for ED lighting has a period of 250 ws and a pulse width of 12.8 s.
- the pulse signal from PD 20 is output according to the H level of the LED driving pulse.
- the LED drive pulse is used to turn on and off the switch element 54 of the high-pass filter circuit 44 and the switch element 70 of the peak hold circuit 65.
- a threshold voltage is formed as described in the first embodiment, and is applied to the mask circuit 42.
- the mask circuit 42 also receives a pulse signal from the band-pass filter circuit Z amplifier circuit 26.
- a signal in which the threshold voltage of the pulse signal is masked is formed.
- the threshold voltage of the masked pulse signal is removed by the high-pass filter circuit 44, and a signal component equal to or higher than the threshold voltage is input to the output switching circuit 62.
- the pulse signal from the bandpass filter circuit amplifier circuit 26 is also input to the output switching switch circuit 62.
- the pulse signal from the band-pass filter circuit Z amplifier circuit 26 has a threshold voltage or lower as shown by the waveform (a) in FIG.
- the switch circuit 62 selects the pulse signal from the band-pass filter circuit Z amplifier circuit 26 and sends it to the amplifier circuit 63.
- the amplified signal is output from the amplifier circuit 63, as shown in the waveform (b) of FIG.
- the switching control signal of the waveform (d) in FIG. 12 is at the L level. Therefore, the switch circuit 62 selects the high-pass filter circuit 44. In this case, since the pulse signal is not output from the high-pass filter circuit 44, there is no output from the switch circuit 62. Therefore, when the pulse signal from the band-pass filter circuit amplifier circuit 26 is equal to or lower than the threshold voltage, the peak value of the pulse signal generated at the time of the first LED lighting is set to the peak hold circuit 30 Is held in.
- the pulse signal from the bandpass filter circuit amplifier circuit 26 has a threshold voltage or higher as shown by the waveform (a) in FIG.
- the switch switching control signal of the waveform (d) in FIG. 13 is at the H level. Therefore, the switch circuit 62 selects the pulse signal from the band-pass filter amplifier circuit 26 and sends it to the amplifier circuit 63. Since the pulse signal exceeds the saturation voltage of the amplification circuit 63, the output from the amplification circuit 63 has a collapsed waveform as shown in the waveform (b) of FIG.
- the switch switching control signal of the waveform (d) in FIG. 13 is at the L level. Therefore, the switch circuit 62 selects the high-pass filter circuit 44. In this case, the high-pass filter circuit 44 outputs a component higher than the threshold voltage.
- the saturation voltage output from the amplifier circuit 63 at the time of the first LED lighting When the LED is turned on for the second time, the components output from the amplifier circuit 63 and above the threshold voltage are continuously peak-held, and the A / D converter 34 Is input to the input terminal CH1, and is converted to a digital value and output.
- the microcomputer 32 selects digital data to be output later from two digital values output continuously.
- the peak value input to the AZD converter 34 of the microcomputer 32 is the voltage input of the AZD converter as described in Fig. 5. Since it is within the range, it can be processed correctly by a microcomputer.
- the resolution of the A / D converter is kept as it is, and the required number of input terminals (channels) of the A / D converter is kept one as in the past, and the resolution is increased by the analog circuit. be able to.
- the present invention it is possible to increase the resolution by the analog circuit while maintaining the resolution of the A / D converter. Therefore, it is not necessary to increase the resolution of the AZD converter itself, so that a conventional microcomputer can be used and an inexpensive rain sensor can be provided.
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Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003136870A JP2004340709A (ja) | 2003-05-15 | 2003-05-15 | レインセンサ用の信号検出回路および信号検出方法 |
JP2003-136870 | 2003-05-15 |
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WO2004102167A1 true WO2004102167A1 (ja) | 2004-11-25 |
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PCT/JP2004/006756 WO2004102167A1 (ja) | 2003-05-15 | 2004-05-13 | レインセンサ用の信号検出回路および信号検出方法 |
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WO (1) | WO2004102167A1 (ja) |
Families Citing this family (2)
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CN101941415B (zh) * | 2010-08-12 | 2012-03-07 | 上海英恒电子有限公司 | 雨量传感器及控制方法 |
JP5940388B2 (ja) * | 2012-06-22 | 2016-06-29 | 株式会社ヴァレオジャパン | 雨滴検出装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61248622A (ja) * | 1985-04-26 | 1986-11-05 | Mitsubishi Electric Corp | アナログデイジタル変換装置 |
JPH02189444A (ja) * | 1989-01-19 | 1990-07-25 | Honda Motor Co Ltd | 光学式検出装置 |
JPH0332226A (ja) * | 1989-06-29 | 1991-02-12 | Yamaha Corp | A/d変換装置 |
JPH06197019A (ja) * | 1992-12-25 | 1994-07-15 | Hitachi Denshi Ltd | デジタルオシロスコープ |
JPH0983363A (ja) * | 1995-09-13 | 1997-03-28 | Yaskawa Electric Corp | A/d変換回路 |
JP2000329862A (ja) * | 1999-05-21 | 2000-11-30 | Nippon Sheet Glass Co Ltd | 降雨状態検出方法及び降雨状態検出装置 |
JP2002277386A (ja) * | 2001-01-10 | 2002-09-25 | Nippon Sheet Glass Co Ltd | 検出装置およびその検出方法、それを用いたワイパー制御装置 |
-
2003
- 2003-05-15 JP JP2003136870A patent/JP2004340709A/ja active Pending
-
2004
- 2004-05-13 WO PCT/JP2004/006756 patent/WO2004102167A1/ja unknown
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61248622A (ja) * | 1985-04-26 | 1986-11-05 | Mitsubishi Electric Corp | アナログデイジタル変換装置 |
JPH02189444A (ja) * | 1989-01-19 | 1990-07-25 | Honda Motor Co Ltd | 光学式検出装置 |
JPH0332226A (ja) * | 1989-06-29 | 1991-02-12 | Yamaha Corp | A/d変換装置 |
JPH06197019A (ja) * | 1992-12-25 | 1994-07-15 | Hitachi Denshi Ltd | デジタルオシロスコープ |
JPH0983363A (ja) * | 1995-09-13 | 1997-03-28 | Yaskawa Electric Corp | A/d変換回路 |
JP2000329862A (ja) * | 1999-05-21 | 2000-11-30 | Nippon Sheet Glass Co Ltd | 降雨状態検出方法及び降雨状態検出装置 |
JP2002277386A (ja) * | 2001-01-10 | 2002-09-25 | Nippon Sheet Glass Co Ltd | 検出装置およびその検出方法、それを用いたワイパー制御装置 |
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