WO1998017511A1 - Steuervorrichtung für einen optischen sensor - Google Patents
Steuervorrichtung für einen optischen sensor Download PDFInfo
- Publication number
- WO1998017511A1 WO1998017511A1 PCT/DE1997/002097 DE9702097W WO9817511A1 WO 1998017511 A1 WO1998017511 A1 WO 1998017511A1 DE 9702097 W DE9702097 W DE 9702097W WO 9817511 A1 WO9817511 A1 WO 9817511A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmitter
- control device
- power
- sensor
- rain sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
- G01D3/024—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation for range change; Arrangements for substituting one sensing member by another
-
- 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 invention relates to a control device for an optical sensor according to the preamble of the main claim.
- a control device for optical rain sensors for use in motor vehicle windshield wiper systems is already known (US Pat. No. 4,859,867), which contains a compensation circuit for ambient light, temperature and other system variables. To compensate for the
- the optical transmitter of the rain sensor is operated with a high-frequency pulse in ambient light.
- a receiver detects the high-frequency output radiation from the transmitter and delivers modulated signals to a microcontroller, which detects the alternating component of the signals from the direct component
- False signals (such as ambient light, etc.) separate.
- the currently preferred frequency for controlling the transmitter in this case a light-emitting diode (LED), is 1000 Hz.
- the preferred pulse width is 15 microseconds.
- the signals evaluated in the microcontroller control the wiper motor. As a side effect, the lifespan of the LED is longer compared to continuous operation.
- the control device according to the invention with the characterizing features of the main claim has the advantage of increasing the service life of the transmitter by reducing the transmitter power without impairing the sensitivity of the rain sensor.
- the lifespan of the transmitter is thus matched to the lifespan of the other electronic components and the lifespan of the entire sensor is increased.
- control device of the optical sensor differentiates between dryness and moisture.
- the transmitter operates at reduced power when it is dry and at full power when it is wet.
- Transmitter power is also obtained by pulsed operation of the rain sensor.
- the upper limit of the period for the response time of the human Eye is adjusted so that no delay is noticeable.
- External events do not have to be taken into account for the duration of the period, since they run much more slowly than the reaction time, eg rain drips onto a pane.
- Another advantage is that the degree of power reduction through other parameters such as Can be varied day or night and can thus be optimally adjusted to the different needs of the motor vehicle driver.
- One advantage of pulsed operation is that the sensor maintains its sensitivity even during dryness and already detects low humidity.
- An advantage of reducing the transmitter power during non-pulsed operation is that the sensor detects greater moisture without delay.
- FIG. 1 shows a block diagram with pulsed operation of the transmitter
- FIG. 2 shows a diagram of the quotient of the voltages dropping at the transmitter, plotted over time, in the presence of moisture or dryness of the pane during pulsed operation of the transmitter
- FIG. 3 shows a block diagram of a transmitter that can be switched between reduced and full power
- FIG. 4 shows a diagram of the quotient of the voltages dropping at the transmitter, plotted over time, in the presence of moisture or dryness of the pane in a transmitter which can be switched between reduced and full power,
- FIG. 5 is a block diagram for switching the
- Control device for an optical sensor in a windshield wiper control device for an optical sensor in a windshield wiper control device.
- FIG. 1 shows a block diagram of a control device 11 for an optical rain sensor 10, which is operated in a pulsed manner.
- the rain sensor is e.g. B. in motor vehicles to control a windshield wiper.
- the control device 11 comprises a controller 18 with a timer 183, a transistor T1 as a power switching element, an operating switch 16 and a day / night detection sensor 17.
- the rain sensor 10 has a light-emitting diode (LED) as an optical transmitter 12 and a receiver 13.
- the transmitter 12 is switched by the transistor T1 connected in series.
- the positive pole 14 of a battery voltage is switched to ground 15 via the transmitter 12 and the transistor T1.
- the control 18 is switched on.
- the transistor T1 is controlled via a signal output 181 of the controller 18.
- the signal at the output 181 has a digital profile, so that the transistor T1 is blocked or conductive.
- the controller 18 receives measurement signals 19 of the rain sensor 10 via a signal input 182 and further measurement signals 171 of the day / night detection sensor via a further signal input 184. Dashed over one Signal output 101 shown of the rain sensor 10, the windshield wiper, not shown, is driven.
- the voltage drop at transmitter 12 is referred to as Us.
- the curve profile shown corresponds to the exemplary embodiment according to FIG. 1.
- the quotient of the voltages U s / U S / inax takes on the values zero or one.
- Time axis t is divided into three areas t ⁇ tl, tl ⁇ t ⁇ t2 and t> t2. According to the lower curve in FIG. 2, moisture is present before tl and after t2. There is no moisture between tl and t2. Accordingly, the transmitter 12 is only pulsed by a corresponding measurement signal 19 at the input 182 from the control device 11 when the pane is dry, but continuously when the pane is wet.
- T1 If there is moisture on the pane, T1 is turned on and the transmitter 12 is operated at full power.
- Voltage drop Us at transmitter 12 is at a maximum and the quotient of the voltages takes on the value one. As long as moisture is present, this condition remains. This can be seen in Figure 2 at t ⁇ tl.
- the transmitter 12 is pulsed via Tl.
- the sensitivity of the sensor 10 is in the predetermined time Tv maximum, so that in the event of brief showers (known as April weather) the sensor remains fully operational.
- the transmitter 12 is pulsed with a period T of 500 milliseconds and a pulse width Tw of 10 milliseconds.
- the controller 18 generates a corresponding signal for the transistor T1.
- the quotient of the voltages at the transmitter 12 assumes the value zero between the pulses and the value one during the pulse width Tw.
- the time axis in FIG. 2 has different scales: the predetermined time Tv can e.g. are two minutes or more, in contrast to the period T, which lasts only 0.5 seconds.
- the controller 18 ends the pulsed operation and the transmitter 12 is permanently activated with full sensitivity via the switch T1.
- a first wiping process of the windshield wipers (not shown here) is activated via the indicated signal output 101. The wiping processes are then triggered as a function of the amount of moisture detected by the rain sensor 10 via the signal output 101.
- the choice of the period T depends on the reaction time of the human eye.
- the response time is approximately 500 milliseconds on average.
- the driver of the motor vehicle gains the impression that the control device responds too slowly.
- the inertia of human comprehension thus sets the
- Period T an upper limit.
- the response time is e.g. Weather, darkness or tiredness of the driver increases, the upper limit can be one second.
- the pulse width Tw of approximately ten milliseconds results from measurement purposes.
- the transmitter 12 of a rain sensor 10 is additionally superimposed with a high-frequency modulation, as already mentioned at the beginning, which has a period of a few milliseconds or less.
- the pulse width Tw should be chosen to be greater than the period of the high-frequency modulation.
- FIG. 3 shows a block diagram of a control device 31 for an optical rain sensor 30, the transmitter power is switchable.
- the control device 31 comprises a controller 38 with a timer 383, an adjustable current sink S1, an operating switch 36 and a day / night detection sensor 37.
- the rain sensor has a light-emitting diode as an optical transmitter 32 and a receiver 33.
- the transmitter 32 is connected in series with the controllable current sink 33 and connected to a positive pole 34 of a battery voltage and to ground 35.
- the current sink S1 is controlled via a control output 381 of the controller 38.
- the controller 38 receives measurement signals 39 of the rain sensor 30 via a signal input 382 and further measurement signals 371 of the day / night detection sensor 37 via a further signal input 384.
- the controller 38 is connected to an operating switch 36.
- the rain sensor 30 has a further signal output 301, indicated by dashed lines, via which a windshield wiper (not shown) is activated.
- FIG. 4 like FIG. 2, shows the ratio of the voltage drop Us at the transmitter 32 to the maximum voltage drop Us, max at the transmitter 32 and the presence of moisture, plotted over the time axis t.
- the curve shape shown corresponds to that
- the quotient can assume values from zero to one. In this exemplary embodiment, the quotient takes the values 0.5 or one.
- the transmitter 32 In the event of moisture, the transmitter 32 is operated at full power via the current sink S1.
- Measurement signal 39 to the controller 38.
- the controller 38 switches the transmitter 32 to full power via the current sink S1 and triggers a first wiping operation of the windshield wipers (not shown here).
- the future wiping rate of the windshield wiper is determined automatically on the basis of the amount of moisture which is detected by the rain sensor which is now operated with full sensitivity (t> t2).
- the rain sensor 30 does not immediately detect the moisture, since the sensitivity of the
- the degree of reduction of the transmitter power can be predefined by the control 38 or influenced by external parameters. So z. B. it makes sense in combination with a day / night detection sensor to set the sensitivity of the transmitter 32 when the windows are dry at night higher than during the day.
- the transmitter 12 of a rain sensor 10 can also be additionally superimposed with a high-frequency modulation mentioned at the outset, which has a period of a few milliseconds or less.
- Figure 5 shows a block diagram of a
- Windshield wiper control device 52 with control device 51, rain sensor 50, control device 53 for a wiper motor 54 and wiper motor 54 and a windshield wiper 55 driven by wiper motor 54.
- Rain sensor 50 has two outputs 501, 502, with measurement signals 59 being sent to the control device via one output 502 51 are given and the same measurement signals 59 are given to the control device 53 of the wiper motor 54 via the other output 501.
- the moisture or dryness of a windshield of a motor vehicle, not shown, detected by the rain sensor is, on the one hand, sent to the control device 51 of the rain sensor 50 as a measurement signal 59. On the basis of this measurement signal 59, the control device 51 switches the
- Transmitter of the rain sensor 50 to full or reduced power, the pulsed operation likewise being carried out under reduced power of the rain sensor 50 is detected.
- the mode of operation of the control device 51 for the rain sensor 50 can be found in the aforementioned exemplary embodiments.
- the same measurement signals 59 are fed via the output 501 to a control device 53 which, in a known manner, automatically controls the wiper motor 54 as a function of the moisture signals 59 and operates the windshield wiper 55. It is not absolutely necessary for the rain sensor 50 to have two outputs 501, 502. An output 502 is sufficient if the measurement signal 59 is supplied to the control device 51 and the control device 53.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Technology Law (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/077,306 US6040669A (en) | 1996-10-22 | 1997-09-18 | Control device for an optical sensor |
| EP97943782A EP0871579B2 (de) | 1996-10-22 | 1997-09-18 | Steuervorrichtung für einen optischen sensor |
| DE59707155T DE59707155D1 (de) | 1996-10-22 | 1997-09-18 | Steuervorrichtung für einen optischen sensor |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19643465.3 | 1996-10-22 | ||
| DE19643465A DE19643465C2 (de) | 1996-10-22 | 1996-10-22 | Steuervorrichtung für einen optischen Sensor, insbesondere einen Regensensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998017511A1 true WO1998017511A1 (de) | 1998-04-30 |
Family
ID=7809383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE1997/002097 Ceased WO1998017511A1 (de) | 1996-10-22 | 1997-09-18 | Steuervorrichtung für einen optischen sensor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6040669A (de) |
| EP (1) | EP0871579B2 (de) |
| KR (1) | KR100478546B1 (de) |
| DE (2) | DE19643465C2 (de) |
| ES (1) | ES2176789T5 (de) |
| WO (1) | WO1998017511A1 (de) |
Families Citing this family (37)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19729103A1 (de) * | 1997-07-08 | 1999-01-14 | Bosch Gmbh Robert | Vorrichtung und Verfahren zum Betreiben eines Regensensors |
| DE19740364A1 (de) * | 1997-09-13 | 1999-03-25 | Bosch Gmbh Robert | Vorrichtung und Verfahren zum Betreiben eines Regensensors |
| DE19951832A1 (de) * | 1999-10-28 | 2001-05-03 | Valeo Auto Electric Gmbh | Sensor zur Detektion von Feuchtigkeitstropfen und/oder Schmutzpartikeln auf einer Scheibe und Verfahren zum Betreiben eines solchen Sensors |
| DE19951831A1 (de) * | 1999-10-28 | 2001-05-03 | Valeo Auto Electric Gmbh | Sensor zur Detektion von Feuchtigkeitstropfen und/oder Schmutzpartikeln auf einer Scheibe und Verfahren zum Betreiben eines solchen Sensors |
| US8788092B2 (en) | 2000-01-24 | 2014-07-22 | Irobot Corporation | Obstacle following sensor scheme for a mobile robot |
| US8412377B2 (en) | 2000-01-24 | 2013-04-02 | Irobot Corporation | Obstacle following sensor scheme for a mobile robot |
| US6956348B2 (en) * | 2004-01-28 | 2005-10-18 | Irobot Corporation | Debris sensor for cleaning apparatus |
| US6690134B1 (en) | 2001-01-24 | 2004-02-10 | Irobot Corporation | Method and system for robot localization and confinement |
| US7571511B2 (en) | 2002-01-03 | 2009-08-11 | Irobot Corporation | Autonomous floor-cleaning robot |
| DE10126953A1 (de) * | 2001-06-01 | 2002-12-05 | Bosch Gmbh Robert | Verfahren zum Betreiben eines Regensensors sowie Regensensor zur Durchführung des Verfahrens |
| US8396592B2 (en) | 2001-06-12 | 2013-03-12 | Irobot Corporation | Method and system for multi-mode coverage for an autonomous robot |
| US7429843B2 (en) | 2001-06-12 | 2008-09-30 | Irobot Corporation | Method and system for multi-mode coverage for an autonomous robot |
| US9128486B2 (en) | 2002-01-24 | 2015-09-08 | Irobot Corporation | Navigational control system for a robotic device |
| US8428778B2 (en) | 2002-09-13 | 2013-04-23 | Irobot Corporation | Navigational control system for a robotic device |
| US8386081B2 (en) | 2002-09-13 | 2013-02-26 | Irobot Corporation | Navigational control system for a robotic device |
| DE10261102A1 (de) | 2002-12-20 | 2004-07-01 | Robert Bosch Gmbh | Regensensor, insbesondere für ein Kraftfahrzeug und Verfahren zu dessen Herstellung |
| US7332890B2 (en) | 2004-01-21 | 2008-02-19 | Irobot Corporation | Autonomous robot auto-docking and energy management systems and methods |
| DE112005000738T5 (de) | 2004-03-29 | 2007-04-26 | Evolution Robotics, Inc., Pasadena | Verfahren und Vorrichtung zur Positionsbestimmung unter Verwendung von reflektierten Lichtquellen |
| WO2006002385A1 (en) | 2004-06-24 | 2006-01-05 | Irobot Corporation | Programming and diagnostic tool for a mobile robot |
| US8972052B2 (en) | 2004-07-07 | 2015-03-03 | Irobot Corporation | Celestial navigation system for an autonomous vehicle |
| US7706917B1 (en) | 2004-07-07 | 2010-04-27 | Irobot Corporation | Celestial navigation system for an autonomous robot |
| US8392021B2 (en) | 2005-02-18 | 2013-03-05 | Irobot Corporation | Autonomous surface cleaning robot for wet cleaning |
| US7620476B2 (en) | 2005-02-18 | 2009-11-17 | Irobot Corporation | Autonomous surface cleaning robot for dry cleaning |
| KR101247933B1 (ko) | 2005-02-18 | 2013-03-26 | 아이로보트 코퍼레이션 | 습식 및 건식 청소를 위한 자동 표면 청소 로봇 |
| US8930023B2 (en) | 2009-11-06 | 2015-01-06 | Irobot Corporation | Localization by learning of wave-signal distributions |
| EP2816434A3 (de) | 2005-12-02 | 2015-01-28 | iRobot Corporation | Roboter mit autonomem Wirkungsbereich |
| KR101099808B1 (ko) | 2005-12-02 | 2011-12-27 | 아이로보트 코퍼레이션 | 로봇 시스템 |
| EP2251757B1 (de) | 2005-12-02 | 2011-11-23 | iRobot Corporation | Abdeckungsrobotermobilität |
| WO2007065034A1 (en) | 2005-12-02 | 2007-06-07 | Irobot Corporation | Modular robot |
| ES2706729T3 (es) | 2005-12-02 | 2019-04-01 | Irobot Corp | Sistema de robot |
| ES2583374T3 (es) | 2006-05-19 | 2016-09-20 | Irobot Corporation | Eliminación de residuos de robots de limpieza |
| US8417383B2 (en) | 2006-05-31 | 2013-04-09 | Irobot Corporation | Detecting robot stasis |
| US8001649B2 (en) * | 2006-10-10 | 2011-08-23 | Rhodes Robert V | Wiper assembly for sweeping a glass surface on a vehicle |
| EP2574265B1 (de) | 2007-05-09 | 2015-10-14 | iRobot Corporation | Kompakter Roboter mit autonomer Reichweite |
| US8283876B2 (en) * | 2009-09-17 | 2012-10-09 | Dialog Semiconductor Gmbh | Circuit for driving an infrared transmitter LED with temperature compensation |
| US8800107B2 (en) | 2010-02-16 | 2014-08-12 | Irobot Corporation | Vacuum brush |
| US9481777B2 (en) | 2012-03-30 | 2016-11-01 | The Procter & Gamble Company | Method of dewatering in a continuous high internal phase emulsion foam forming process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859867A (en) * | 1988-04-19 | 1989-08-22 | Donnelly Corporation | Windshield moisture sensing control circuit |
| JPH045717A (ja) * | 1990-04-24 | 1992-01-09 | Hitachi Ltd | タッチパネルのタッチ操作検出装置 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4317073A (en) * | 1977-02-03 | 1982-02-23 | Henry Blaszkowski | Windshield wiper control system |
| US4620141A (en) * | 1985-07-03 | 1986-10-28 | Vericom Corp. | Rain-controlled windshield wipers |
| US4916374A (en) * | 1989-02-28 | 1990-04-10 | Donnelly Corporation | Continuously adaptive moisture sensor system for wiper control |
| US5059877A (en) * | 1989-12-22 | 1991-10-22 | Libbey-Owens-Ford Co. | Rain responsive windshield wiper control |
| DE4217390C2 (de) † | 1991-06-24 | 1994-06-16 | Kostal Leopold Gmbh & Co Kg | Einrichtung zur Steuerung einer Scheibenwischanlage |
| DE4134432A1 (de) * | 1991-10-18 | 1993-04-22 | Daimler Benz Ag | Verfahren zur anpassung der ansprechempfindlichkeit eines niederschlagssensorsystems an umgebungsverhaeltnisse und sensorsystem mit einem niederschlagssensor |
| DE4339574C2 (de) * | 1993-11-19 | 1999-07-15 | Gerd Reime | Auswertevorrichtung für Signale, die von einer Meßanordnung zum Messen oder Erkennen einer Benetzung einer Fläche ermittelt wurden |
| DE9309837U1 (de) * | 1993-07-02 | 1993-09-02 | Reime, Gerd, 75328 Schömberg | Anordnung zum Messen oder Erkennen der Benetzung einer für eine bestimmte Strahlung durchlässigen Wand oder Platte |
| US5560245A (en) * | 1994-07-29 | 1996-10-01 | Lake Center Industries, Inc. | Moisture activated wiper sensor |
| US5568027A (en) * | 1995-05-19 | 1996-10-22 | Libbey-Owens-Ford Co. | Smooth rain-responsive wiper control |
-
1996
- 1996-10-22 DE DE19643465A patent/DE19643465C2/de not_active Revoked
-
1997
- 1997-09-18 ES ES97943782T patent/ES2176789T5/es not_active Expired - Lifetime
- 1997-09-18 KR KR10-1998-0704639A patent/KR100478546B1/ko not_active Expired - Fee Related
- 1997-09-18 DE DE59707155T patent/DE59707155D1/de not_active Expired - Lifetime
- 1997-09-18 EP EP97943782A patent/EP0871579B2/de not_active Expired - Lifetime
- 1997-09-18 WO PCT/DE1997/002097 patent/WO1998017511A1/de not_active Ceased
- 1997-09-18 US US09/077,306 patent/US6040669A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859867A (en) * | 1988-04-19 | 1989-08-22 | Donnelly Corporation | Windshield moisture sensing control circuit |
| JPH045717A (ja) * | 1990-04-24 | 1992-01-09 | Hitachi Ltd | タッチパネルのタッチ操作検出装置 |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 151 (P - 1337) 14 April 1992 (1992-04-14) * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0871579B2 (de) | 2011-01-26 |
| ES2176789T3 (es) | 2002-12-01 |
| KR100478546B1 (ko) | 2005-07-25 |
| DE59707155D1 (de) | 2002-06-06 |
| DE19643465A1 (de) | 1998-04-30 |
| EP0871579B1 (de) | 2002-05-02 |
| ES2176789T5 (es) | 2011-05-17 |
| US6040669A (en) | 2000-03-21 |
| EP0871579A1 (de) | 1998-10-21 |
| KR19990076573A (ko) | 1999-10-15 |
| DE19643465C2 (de) | 1999-08-05 |
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