WO2010050607A1 - 静電容量型センサ - Google Patents
静電容量型センサ Download PDFInfo
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- WO2010050607A1 WO2010050607A1 PCT/JP2009/068762 JP2009068762W WO2010050607A1 WO 2010050607 A1 WO2010050607 A1 WO 2010050607A1 JP 2009068762 W JP2009068762 W JP 2009068762W WO 2010050607 A1 WO2010050607 A1 WO 2010050607A1
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- sensor
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- guard
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/01516—Passenger detection systems using force or pressure sensing means
- B60R21/0152—Passenger detection systems using force or pressure sensing means using strain gauges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/0153—Passenger detection systems using field detection presence sensors
- B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/055—Padded or energy-absorbing fittings, e.g. seat belt anchors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
Definitions
- the present invention relates to a capacitance type sensor that detects a capacitance between a detection target and a detection target existing in a detection region, and particularly to a capacitance type that can detect the position of a detection target in the detection region with high accuracy. It relates to sensors.
- the headrest driving device disclosed in the following Patent Document 1 is separated from the inside of the supporting means for movably supporting the headrest, the driving means for reciprocating the headrest, and the portion of the headrest outer cover that supports the head.
- a position control means for controlling a drive means for driving the actuator to move.
- the headrest is controlled by the position control means so that the head is positioned at the center of the plurality of detection electrodes, in other words, the headrest moves following the movement of the head. It is driven by the driving means and automatically adjusts the position of the headrest.
- the apparatus for adjusting the headrest disclosed in the following Patent Document 2 is configured to have a sensor including two capacitor plates arranged in the headrest for detecting the head position of the occupant. These two capacitor plates are arranged one above the other in the headrest.
- the height position of the headrest is adjusted to change starting from the fixed position where the headrest is retracted. To be.
- the headrest adjusting device disclosed in Patent Document 3 below includes a headrest disposed on an upper portion of a seat back (backrest portion) so that the headrest can be moved up and down by driving a motor, and a head position of a seated person (occupant) And a CPU that adjusts the height of the headrest according to the position of the head of the seated person based on a signal from the head detection sensor.
- the headrest adjusting device when the CPU detects the electrical conduction of the ignition switch, the seating sensor detects that there is a seating, and the seatbelt buckle switch detects that the seatbelt of the vehicle is mounted In addition, the headrest adjustment operation is started.
- a plurality of sensor electrodes with a constant electrode interval are inserted into a resin, and a sensor electrode unit is formed by insert molding.
- This sensor electrode unit has a hollow rectangular cross section and is provided with a sensor electrode on at least one side thereof, thereby maintaining detection performance and improving the degree of freedom of attachment.
- the position of the headrest is adjusted by the capacitance between the headrest and the ceiling of the vehicle.
- the capacitance between the head and the detection electrode is measured by two or three capacitor plates and used for position adjustment. It is said that.
- the headrest position adjusting device disclosed in Patent Document 3 described above the headrest position is adjusted based on the adjustment result of each part of the seat. Furthermore, in the object detection device disclosed in Patent Literature 4 described above, for example, when the centers of a plurality of sensor electrodes and the centers of detection objects are facing each other, each sensor electrode stably stabilizes the object. It is supposed to detect the electric capacity.
- the conventional device it is necessary to detect an object by comparing the output balance of the sensor and the output peak of each detection electrode.
- a detection method for example, depending on the position where a plurality of detection electrodes are arranged.
- the initial capacitance of the detection electrode that is, the capacitance value in the state where the detection target does not exist
- the detection sensitivity differ greatly.
- FIG. 10 shows a sample configuration for an experiment conducted by the present applicant
- FIG. 11 shows a result of the experiment.
- a sensor unit 102 in which a plurality of sensor electrodes 102a to 102e are formed on a substrate 102f is arranged on a pedestal 101 made of, for example, polystyrene foam.
- a flat plate 104 to which a ground (GND) potential was applied in the direction of the white arrow in FIG. 10 was placed on the sensor unit 102 with a plate member 103 made of foamed polystyrene having a predetermined thickness L interposed therebetween.
- GND ground
- each of the distances L relative to the distance L between the sensor unit 102 and the flat plate 104 is determined.
- the output (V) (see FIG. 11A) of the sensor electrodes 102a to 102e and the output change amount (V) with respect to the change in the distance L (see FIG. 11B) were measured.
- the vertical axis of the graph represents the sensor output (V)
- the horizontal axis represents the electrode numbers assigned to the sensor electrodes 102a to 102e (for example, the electrode numbers 1 to 102 in order from the sensor electrodes 102a to 102e). 5 is attached).
- the vertical axis of the graph in FIG. 11B represents the sensor output (V)
- the horizontal axis represents the movement distance (mm).
- the sensor electrode 102a (electrode number 1) is measured.
- the sensor output (V) of the sensor electrode 102e (electrode number 5) was the largest. In other words, the output of the electrode arranged on the outermost side in the arrangement direction (parallel direction) of the sensor electrodes 102a to 102e was the largest.
- this trajectory difference is a difference in output change amount.
- the point group of each sensor output at a place where the change amount ⁇ L is 20 mm to 40 mm is within a range having a variation of about 100 mV. I understood that.
- the distance between the detection target and the sensor unit 102 may be accurately determined depending on the various detection methods as described above. May be difficult to measure.
- the present invention has been made in view of the above points, and it is possible to accurately measure the distance between the detection target and the sensor by reducing the difference in the output change amount of the sensor or the difference in the initial capacity.
- An object of the present invention is to provide a capacitance type sensor that can detect a detection target with high accuracy.
- a capacitance type sensor is a capacitance type sensor that detects a capacitance between a detection target in a detection region and includes a plurality of sensor electrodes arranged on a substrate. An electrode group, and at least a pair of guard electrodes formed so as to sandwich the sensor electrode group between at least a part of the periphery of the sensor electrode group.
- the capacitance type sensor of the present invention By configuring the capacitance type sensor of the present invention as described above, the difference in output change of the sensor and the difference in initial capacitance due to the difference in the arrangement position of the plurality of sensor electrodes constituting the sensor electrode group can be reduced. Thus, the distance between the detection object and the sensor can be accurately measured, and the detection object can be detected with high accuracy.
- the plurality of sensor electrodes constituting the sensor electrode group are driven by, for example, a sensor potential or a guard potential equivalent to the sensor potential, respectively, and the at least one pair of guard electrodes are driven by the guard potential.
- the capacitance-type sensor preferably further includes a detection circuit that detects a capacitance value of the detection target based on outputs from the plurality of sensor electrodes, and the detection circuit includes, for example, the plurality of detection circuits.
- Switching means for switching the sensor potential or the guard potential to be applied to the sensor electrode, and applying the sensor potential or the guard potential to the plurality of sensor electrodes via the switching means, and the guard to the at least one pair of guard electrodes
- Detection means for applying a potential and detecting a capacitance value detected by each sensor electrode. For example, when the sensor potential is applied to one of the plurality of sensor electrodes constituting the sensor electrode group, the switching unit performs switching so that the guard potential is applied to the other sensor electrode. .
- the plurality of sensor electrodes constituting the sensor electrode group are, for example, formed in a rectangular strip shape and arranged on the substrate in a state of being arranged in parallel along the short direction.
- the at least one pair of guard electrodes are arranged on both outer sides in the juxtaposition direction of the plurality of sensor electrodes.
- the plurality of sensor electrodes constituting the sensor electrode group are formed, for example, in a rectangular strip shape, and a part thereof is arranged in parallel along the short direction, and the other is in a direction intersecting the short side direction. It arrange
- the guard electrodes are respectively disposed on both outer sides of the plurality of sensor electrodes in the juxtaposed direction and on both outer sides in the other juxtaposed direction.
- the detection means may sequentially detect, for example, electrostatic capacitance values from the plurality of sensor electrodes from one side to the other side in the parallel arrangement direction.
- the detection means may detect, for example, the capacitance values from the plurality of sensor electrodes in the order of electrode numbers assigned to the sensor electrodes.
- the detection means may detect the surface shape of the detection object based on capacitance values from the plurality of sensor electrodes.
- a sensor electrode group in which at least three sensor electrodes are arranged in parallel along the direction of scanning the surface shape of the detection target and a pair of guard electrodes provided on both outer sides of the sensor electrodes in the arrangement direction are provided.
- the sensor electrode group preferably includes a plurality of sensor electrodes arranged in parallel over at least half of the entire length of the detection target.
- the present invention it is possible to accurately measure the distance between the object to be detected and the sensor by reducing the difference in the output change amount of the sensor, the difference in the initial capacity, etc., and to detect the object to be detected with high accuracy. can do.
- FIG. 1 is an explanatory diagram for explaining an example of an electrode structure of a capacitive sensor according to an embodiment of the present invention
- FIG. 2 is a block diagram showing an example of the overall configuration of the capacitive sensor
- 3 is a block diagram showing a configuration example of a sensor IC of the capacitance type sensor
- FIG. 4 is an operation waveform diagram showing an example of an operation waveform of the sensor IC of the capacitance type sensor.
- a capacitive sensor As shown in FIG. 1, a capacitive sensor according to an embodiment of the present invention is formed, for example, in a rectangular strip shape on a substrate (not shown) along its short direction (direction intersecting the longitudinal direction).
- a sensor electrode group 6 composed of a plurality of sensor electrodes 1 to 5 arranged in parallel with each other, and the sensor electrode group 6 is sandwiched between at least a part of the periphery of the sensor electrode group 6 (that is, the sensor here)
- the sensor electrodes 1 to 5 in the sensor electrode group 6 are arranged on the outermost side of the sensor electrodes 1 to 5 in the electrode group 6 (for example, further outside the sensor electrodes 1 and 5).
- a pair of (a set of) guard electrodes 28a and 28b are formed so as to be in a non-contact state.
- This capacitance type sensor detects the capacitance between the sensor electrodes 1 to 5 arranged in this way constituting the sensor electrode group 6 and the detection target existing in the detection region.
- Each of the sensor electrodes 1 to 5 is driven by being given a predetermined sensor potential or a guard potential equivalent to the sensor potential, and a guard potential is always given to each of the guard electrodes 28a and 28b.
- the sensor electrodes 1 to 5 and the guard electrodes 28a and 28b are formed and arranged on a substrate made of, for example, a flexible printed board, a rigid board, or a rigid flexible board.
- the sensor electrodes 1 to 5 and the guard electrodes 28a and 28b are formed on a substrate made of an insulator such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyamide (PA) or glass epoxy resin. It is made of a conductive material such as copper, copper alloy, or aluminum patterned on the substrate, or a conductive material such as a simple electric wire disposed on the substrate.
- electrode numbers 1 to 5 are assigned to the sensor electrodes 1 to 5 constituting the sensor electrode group 6, respectively. Although five sensor electrodes 1 to 5 are provided here, for example, five or more sensor electrodes may be provided.
- the guard electrodes 28a and 28b are disposed on the same substrate as the substrate on which the sensor electrode group 6 is disposed. In this case, the guard electrodes 28a and 28b may be provided either on the same side as the surface on which the sensor electrode group 6 is disposed or on the opposite side. For example, the guard electrodes 28a and 28b may be provided via an insulating material. You may arrange
- each of the sensor electrodes 1 to 5 constituting the sensor electrode group 6 is a detection circuit that detects the capacitance value of the detection object based on the outputs from the sensor electrodes 1 to 5. It is connected.
- the detection circuit switches the sensor potential or guard potential to be applied to each sensor electrode 1 to 5, and applies the sensor potential or guard potential to each sensor electrode 1 to 5 via this switching circuit 20.
- a sensor IC 21 for detecting the electrostatic capacitance value detected by .about.5.
- the sensor IC 21 always supplies a guard potential to the guard electrodes 28a and 28b.
- the detection circuit includes an ECU (Electronic Control Unit) 22 that controls the switching circuit 20 based on the output from the sensor IC 21 and performs various processes based on the output.
- the switching circuit 20 is configured by, for example, a plurality of FETs, a plurality of analog switches, or a plurality of multiplexers configured to be able to switch the sensor potential or guard potential from the sensor IC 21 and supply the sensor potential to each of the sensor electrodes 1 to 5.
- the switching circuit 20 When the sensor potential is applied to one sensor electrode (for example, sensor electrode 1) of the sensor electrodes 1 to 5 constituting the sensor electrode group 6, the switching circuit 20 The output potential from the sensor IC 21 is switched so as to give a guard potential to the electrodes (for example, the sensor electrodes 2 to 5).
- the sensor IC 21 sequentially changes the capacitance values from the sensor electrodes 1 to 5 of the sensor electrode group 6 from one side to the other in the parallel direction (for example, an order different from the electrode number 1 ⁇ 5). Or by scanning in the order of electrode numbers assigned in advance (for example, the order of the electrode numbers 1 ⁇ 3 ⁇ 5 ⁇ 2 ⁇ 4).
- This sensor IC 21 generates, for example, a pulse signal whose duty ratio changes according to the capacitance between each of the sensor electrodes 1 to 5 of the sensor electrode group 6 and the detection target (not shown) and smoothes it. Output a signal.
- the ECU 22 includes, for example, a CPU, a RAM, a ROM, and the like, and performs various processes using the capacitance value detected by the sensor IC 21.
- the sensor IC 21 has a duty ratio that changes in accordance with the capacitance C.
- the sensor IC 21 is connected to a trigger signal generation circuit 101 that outputs a trigger signal TG having a constant period and an input terminal.
- the timer circuit 102 outputs a pulse signal Po whose duty ratio changes depending on the capacitance C, and a low-pass filter (LPF) 103 that smoothes the pulse signal Po.
- LPF low-pass filter
- the timer circuit 102 is, for example, two comparators 201 and 202, and an RS flip-flop (hereinafter referred to as “RS-FF”) in which outputs of the comparators 201 and 202 are input to a reset terminal R and a set terminal S, respectively. ) 203, a buffer 204 that outputs the output DIS of the RS-FF 203 to the LPF 103, and a transistor 205 that is turned on / off by the output DIS of the RS-FF 203.
- RS-FF RS flip-flop
- the comparator 202 compares the trigger signal TG as shown in FIG. 4 output from the trigger signal generation circuit 101 with a predetermined threshold value Vth2 divided by the resistors R1, R2, and R3, and generates a trigger signal TG. Output synchronized set pulse. This set pulse sets the Q output of the RS-FF 203.
- the Q output turns off the transistor 205 as a discharge signal DIS, and between the sensor electrode 1 (2 to 5) and the ground, the capacitance C to the ground of the sensor electrode 1 (2 to 5), the input terminal, and the power supply
- the battery is charged at a speed determined by a time constant by a resistor R4 connected to the line.
- the potential of the input signal Vin increases at a speed determined by the capacitance C.
- the output of the comparator 201 is inverted and the output of the RS-FF 203 is inverted.
- the transistor 205 is turned on, and the charge accumulated in the sensor electrode 1 (2 to 5) is discharged through the transistor 205.
- the timer circuit 102 oscillates at a duty ratio based on the capacitance C between the sensor electrode 1 (2 to 5) and the detection target (not shown) existing in the detection region.
- the pulse signal Po to be output is output.
- the LPF 103 smoothes the output to output a DC signal Vout as shown in FIG.
- a waveform indicated by a solid line and a waveform indicated by a dotted line indicate that the former has a smaller capacitance than the latter, and for example, the latter indicates an object approaching state.
- FIG. 5 is an explanatory diagram for explaining an operation example of the capacitive sensor according to one embodiment of the present invention.
- the symbol “S” indicates a sensor potential
- “G” indicates a guard potential.
- the pair of guard electrodes 28a and 28b are always driven at the guard potential. Even when the sensor electrodes 1 and 5 arranged on the outermost side of the electrode are active, a state in which there are guard potential electrodes on both sides of the sensor electrodes 1 and 5 (both sides in the juxtaposed direction) is realized. Can do. Therefore, it is possible to suppress electrical capacitive coupling in the outward direction of the sensor electrode group 6.
- the detection target and each sensor are reduced while reducing the difference in output change between the sensor electrodes 1 to 5 constituting the sensor electrode group 6 and the difference in initial capacitance.
- the distance between the electrodes 1 to 5 can be accurately measured, and the detection target can be detected with high accuracy.
- the area of the pair of guard electrodes 28a and 28b may be the same as each of the sensor electrodes 1 to 5 constituting the sensor electrode group 6 or may be larger than that.
- the surface shape of the detection object is scanned. It is preferable that at least three sensor electrodes are arranged in parallel along the direction, and a pair of guard electrodes are provided on both outer sides in the arrangement direction. And the sensor electrode group 6 arranges each sensor electrode in parallel over at least 1/2, preferably 3/4 or more of the total length of the detection object.
- FIG. 7 is an explanatory diagram for explaining another example of the electrode structure of the capacitive sensor according to the embodiment of the present invention.
- the same reference numerals are assigned to the same parts as those already described, the description thereof is omitted, and parts not particularly relevant to the present invention may not be specified.
- a part (for example, sensor electrodes 1 to 3) of the sensor electrodes 1 to 5 constituting the sensor electrode group 6 is along the short direction.
- the other (eg, sensor electrodes 4 and 5) are arranged in parallel so that the short direction is along the direction intersecting with the parallel direction (that is, short direction) of each of the sensor electrodes 1 to 3.
- this state here, the state in which each of the sensor electrodes 1 to 3 is sandwiched
- the pair of guard electrodes 28a and 28b are disposed on the outer sides of the sensor electrodes 1 to 3 in parallel, and the sensor electrodes Another pair of guard electrodes 28c and 28d are arranged on the outer sides of the four and five juxtaposed directions, respectively.
- Other functions and effects are the same as those described above, and a description thereof will be omitted here.
- FIG. 8 is an explanatory view showing an example in which the capacitive sensor according to one embodiment of the present invention is applied to a headrest position adjusting device for a seat
- FIG. 9 is an explanation showing an excerpt of the headrest portion in the headrest position adjusting device.
- the capacitive sensor according to the present embodiment is configured as a sensor unit 10 and is employed in the headrest position adjusting device 100.
- the headrest position adjusting device 100 is provided, for example, inside a headrest 43 of a seat 40 such as a vehicle.
- the sensor electrodes 1 to 5 and the pair of guard electrodes 28a and 28b constituting the sensor electrode group 6 are provided on the front side of the headrest 43.
- the sensor unit 10 is arranged in a state where the headrest 43 is arranged along the height direction of the headrest 43, and the drive motor unit 30 is arranged, for example, on the backrest 41 of the seat 40.
- the sensor unit 10 and the drive motor unit 30 are electrically connected by a harness 29.
- the sensor unit 10 and the drive motor unit 30 may be configured to be controllable by radio or the like.
- the sensor unit 10 includes the sensor electrodes 1 to 5 and the guard electrodes 28a and 28b formed on one surface side of the substrate 19, and the switching circuit 20 and the above-described switching circuit 20 provided on the other surface side of the substrate 19, for example.
- a detection circuit unit 27 including a sensor IC 21 (not shown) is included.
- the capacitance between the head (detection target) 49 of the human body 48 seated on the seating portion 42 of the seat 40 and the headrest 43 (specifically, the sensor electrodes 1 to 5 of the sensor electrode group 6). Is detected.
- the sensor IC 21 of the detection circuit unit 20 detects the capacitance value based on the detection signals from the sensor electrodes 1 to 5, and outputs information on the detection result to the ECU 22 (not shown).
- the ECU 22 detects, for example, the sensor electrode having the highest signal output value among the sensor electrodes 1 to 5 based on the input information, and the center position of the head 49 estimated by calculation according to the detection result. (Estimated center position) and the like are determined, and drive information of the headrest 43 corresponding to the result is output to the drive motor unit 30.
- the drive motor unit 30 moves the support shaft 43a on which the headrest 43 is supported with respect to the backrest unit 41 in accordance with the output from the ECU 22, for example, up and down, left and right, or in the front-and-rear direction.
- (Direction center position) is adjusted so as to match the proper position with respect to the head 49.
- the detected position of one sensor electrode is adjusted so as to face the center position in the height direction of the headrest 43 in the horizontal direction, or the position of this sensor electrode is the center position in the height direction of the headrest 43.
- the headrest 43 is adjusted so that the headrest 43 is positioned to a certain extent above, or the shape profile information of the head 49 based on the detected result is created, and the headrest 43 is adjusted to an appropriate position based on the profile information.
- the sensor unit 10 including the capacitance type sensor according to the above-described embodiment is employed, and therefore the position of the headrest 43 is detected by detecting the detection target with high accuracy. Can be automatically adjusted to an appropriate position. Thereby, for example, when the seat 40 is mounted on a vehicle, it is possible to prevent an accident such as a cervical spine damage at the time of a collision when the position of the headrest 43 is not adjusted.
- the capacitance-type sensor according to the above-described embodiment, the difference in output change between the sensor electrodes 1 to 5 constituting the sensor electrode group 6 and the difference in initial capacitance are reduced.
- the distance between the detection object and the sensor can be accurately measured, and the detection object can be detected with high accuracy.
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Abstract
Description
前記切替手段は、例えば前記センサ電極群を構成する複数のセンサ電極のうちの一のセンサ電極に前記センサ電位が与えられているときは、他のセンサ電極に前記ガード電位が与えられるように切り替える。
この場合、検知対象物の表面形状を走査する方向に沿って少なくとも3つのセンサ電極を並設したセンサ電極群と、前記センサ電極の並設方向両外側に設けた一対のガード電極とを備えることが好ましい。
また前記センサ電極群は、複数のセンサ電極を、検知対象物の全長の少なくとも1/2に渡って並設したものであることが好ましい。
また、ガード電極28a,28bは、センサ電極群6を配置した基板と同一の基板上に配置されている。この場合、ガード電極28a,28bは、センサ電極群6を配置した面と同一面側および反対面側の何れに設けてもよく、また、例えば各ガード電極28a,28bを、絶縁材を介して基板上に配置してもよい。
Claims (13)
- 検知領域に存する検知対象物との間の静電容量を検知する静電容量型センサであって、
基板上に配置された複数のセンサ電極からなるセンサ電極群と、
前記センサ電極群の周囲の少なくとも一部に該センサ電極群を挟むようにそれぞれ形成された少なくとも一対のガード電極とを備える
ことを特徴とする静電容量型センサ。 - 前記センサ電極群を構成する複数のセンサ電極は、それぞれセンサ電位または該センサ電位と同等のガード電位が与えられて駆動され、前記少なくとも一対のガード電極は、前記ガード電位が与えられて駆動されることを特徴とする請求項1項記載の静電容量型センサ。
- 前記複数のセンサ電極からの出力に基づき前記検知対象物の静電容量値を検出する検出回路をさらに備え、
前記検出回路は、前記複数のセンサ電極に与える前記センサ電位または前記ガード電位を切り替える切替手段と、前記切替手段を介して前記複数のセンサ電極に前記センサ電位または前記ガード電位を与えるとともに、前記少なくとも一対のガード電極に該ガード電位を与え、各センサ電極によって検知された静電容量値を検出する検出手段とを有することを特徴とする請求項2記載の静電容量型センサ。 - 前記切替手段は、前記センサ電極群を構成する複数のセンサ電極のうちの一のセンサ電極に前記センサ電位が与えられているときは、他のセンサ電極に前記ガード電位が与えられるように切り替えることを特徴とする請求項3記載の静電容量型センサ。
- 前記センサ電極群を構成する複数のセンサ電極は、矩形短冊状に形成されてその短手方向に沿って並設された状態で前記基板上に配置されていることを特徴とする請求項1~4のいずれか1項記載の静電容量型センサ。
- 前記少なくとも一対のガード電極は、前記複数のセンサ電極の並設方向両外側に配置されていることを特徴とする請求項5記載の静電容量型センサ。
- 前記センサ電極群を構成する複数のセンサ電極は、矩形短冊状に形成されて一部がその短手方向に沿って並設されるとともに、他が前記短手方向と交差する方向にその短手方向が沿うように並設された状態で前記基板上に配置されていることを特徴とする請求項1~4のいずれか1項記載の静電容量型センサ。
- 前記ガード電極は、少なくとも二対設けられ、前記複数のセンサ電極の一部の並設方向両外側および他の並設方向両外側それぞれに配置されていることを特徴とする請求項7記載の静電容量型センサ。
- 前記検出手段は、前記複数のセンサ電極からの静電容量値を前記並設方向の一方から他方に向けて順番に検出することを特徴とする請求項3~6のいずれか1項記載の静電容量型センサ。
- 前記検出手段は、前記複数のセンサ電極からの静電容量値を各センサ電極に割り当てた電極番号順に検出することを特徴とする請求項3~7記載の静電容量型センサ。
- 前記検出手段は、前記複数のセンサ電極からの静電容量値に基づいて検知対象物の表面形状を検出することを特徴とする請求項3~10記載の静電容量センサ。
- 検知対象物の表面形状を走査する方向に沿って、少なくとも3つのセンサ電極を並設したセンサ電極群と、
前記センサ電極の並設方向両外側に設けた一対のガード電極と
を備えることを特徴とする請求項11記載の静電容量型センサ。 - 前記センサ電極群は、複数のセンサ電極を、検知対象物の全長の少なくとも1/2に渡って並設したことを特徴とする請求項11または12記載の静電容量型センサ。
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JP2010535860A JPWO2010050607A1 (ja) | 2008-10-31 | 2009-11-02 | 静電容量型センサ |
EP09823717A EP2362178A1 (en) | 2008-10-31 | 2009-11-02 | Capacitance-type sensor |
CN2009801435277A CN102203547A (zh) | 2008-10-31 | 2009-11-02 | 静电容量型传感器 |
US13/097,955 US20110254572A1 (en) | 2008-10-31 | 2011-04-29 | Capacitance-type sensor |
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JP2008-281673 | 2008-10-31 |
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US13/097,955 Continuation-In-Part US20110254572A1 (en) | 2008-10-31 | 2011-04-29 | Capacitance-type sensor |
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PCT/JP2009/068762 WO2010050607A1 (ja) | 2008-10-31 | 2009-11-02 | 静電容量型センサ |
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US (1) | US20110254572A1 (ja) |
EP (1) | EP2362178A1 (ja) |
JP (1) | JPWO2010050607A1 (ja) |
KR (1) | KR20110089858A (ja) |
CN (1) | CN102203547A (ja) |
WO (1) | WO2010050607A1 (ja) |
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JP2013533952A (ja) * | 2010-05-07 | 2013-08-29 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | 探知機 |
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JP5353991B2 (ja) * | 2010-11-30 | 2013-11-27 | 株式会社日本自動車部品総合研究所 | 静電容量式乗員検知装置 |
DE102011121775B3 (de) | 2011-12-21 | 2013-01-31 | Brose Fahrzeugteile Gmbh & Co. Kg, Hallstadt | Steuersystem |
DE102015119701A1 (de) * | 2015-11-15 | 2017-05-18 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Verfahren für den Betrieb einer kapazitiven Sensoranordnung eines Kraftfahrzeugs |
CN105823411B (zh) * | 2016-03-18 | 2019-02-22 | 苏州椒图电子有限公司 | 一种曲面轮廓测量方法 |
KR102098693B1 (ko) * | 2018-01-12 | 2020-04-08 | 주식회사 지티에스엠 | 웨이퍼의 챔버에 대한 갭핑을 감지하는 웨이퍼형 갭핑 감지 센서 |
GB2580164A (en) * | 2018-12-21 | 2020-07-15 | Imperial College Sci Tech & Medicine | A sensor |
CN114543644B (zh) * | 2022-02-18 | 2022-11-15 | 广州市欧智智能科技有限公司 | 一种头部位置检测方法、装置、终端和介质 |
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Also Published As
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JPWO2010050607A1 (ja) | 2012-03-29 |
CN102203547A (zh) | 2011-09-28 |
EP2362178A1 (en) | 2011-08-31 |
US20110254572A1 (en) | 2011-10-20 |
KR20110089858A (ko) | 2011-08-09 |
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