JP2011033387A - Angular detection sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an angular detection sensor applied to an apparatus which switches its drive mode in accordance with the rotational angle of an object to be detected, which outputs a detection voltage in a step manner with respect to the rotational angle of the object by a simple processing structure. <P>SOLUTION: The angular detection sensor is equipped with: a magnet 18 which is rotatable together with a rotating shaft; a magnetic sensor for outputting a signal corresponding to a change in magnetic flux caused by the rotation of the magnet 18; first and second detection units 21, 22 for binarizing the signal outputted from the magnetic sensor and outputting it; and a variable resistor circuit 31 for outputting detection voltages with varied voltage levels in a step manner on the basis of the binarized signal outputted from the first and second detection units 21, 22. The first and second detection units 21, 22 are arranged spaced apart from each other by the magnetized pitch of the magnet 18 in the rotational direction of the magnet 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an angle detection sensor, and more particularly to an angle detection sensor that outputs a detection voltage stepwise with respect to a rotation angle of a detection target.

  In general, an angle detection sensor that outputs a detection voltage linear with respect to a rotation angle is known. This type of angle detection sensor is configured by providing a magnet as a detection target and arranging a magnetic detection element facing the magnet. And the magnetic flux which acts on a magnetic detection element changes with rotation of a detection target, and the linear output voltage according to the change (rotation angle) of magnetic flux is output from an angle detection sensor.

  As an angle detection sensor for detecting a rotation angle of a detection target, one that outputs a detection voltage in a stepwise manner with respect to the rotation angle is known (for example, see Patent Document 1). The angle detection sensor described in Patent Document 1 is configured by arranging a rotation shaft as a detection target inside a ring-shaped core, attaching a magnetic detection element to the core, and a ring-shaped magnet on the rotation shaft. Further, the magnetic detection element is connected to a signal processing unit that corrects the output voltage stepwise by a comparator or a numerical value correspondence table.

  When an output voltage corresponding to the rotation angle is input to the signal processing unit, the output voltage is corrected to a voltage level set stepwise by the signal processing unit. As described above, the angle detection sensor described in Patent Document 1 obtains a stepped output voltage by correcting the output voltage linear with respect to the rotation angle in a stepwise manner via the signal processing unit.

JP 2002-206911 A

  However, in the angle detection sensor that outputs an output voltage that is linear with respect to the rotation angle described above, the detection voltage is fluctuated due to a mechanical play or the like to be detected, and the drive mode is switched according to the magnitude of the detection voltage When applied to the above, there is a risk of malfunction.

  In this respect, in the angle detection sensor described in Patent Document 1, since the detection voltage is output at a stepped voltage level, the fluctuation of the detection voltage due to the mechanical play of the detection target is absorbed. There is a problem that the processing configuration becomes complicated.

  The present invention has been made in view of such circumstances, and is applied to an apparatus that switches a drive mode in accordance with a rotation angle of a detection target. An object of the present invention is to provide an angle detection sensor capable of outputting a detection voltage stepwise.

  An angle detection sensor according to the present invention includes a magnet that can rotate with a detection target, and a magnetic sensor that outputs a signal corresponding to a change in magnetic flux caused by the rotation of the magnet, and binarizes the signal output from the magnetic sensor. A plurality of detection units that output the voltage, and a voltage output unit that outputs a detection voltage whose voltage level is changed stepwise based on the binarized signals output from the plurality of detection units. A detection part is arrange | positioned between the magnetization pitches of the said magnet along the rotation direction of the said magnet.

  According to this configuration, the detection voltage is output at a stepped voltage level according to the rotation angle of the detection target based on the binarized signals output from the plurality of detection units. The fluctuation of the detection voltage due to is absorbed. Therefore, when applied to a device that switches the drive mode in accordance with the rotation angle of the detection target, malfunction of switching is prevented. In addition, since the rotation angle of the detection target is binarized in the detection unit, a numerical value correspondence table is not required as compared with the conventional angle detection sensor, and the voltage output unit can have a simple processing configuration. Furthermore, since a plurality of detection units are arranged between the magnetization pitches of the magnets, the angle range corresponding to the magnetization pitch can be divided into a plurality of detections according to the arrangement intervals of the plurality of detection units.

  According to the present invention, in the angle detection sensor, the voltage output unit includes a power source and a variable resistance circuit that varies a resistance value stepwise based on the binarized signals output from the plurality of detection units. The detection voltage is output by changing the voltage level of the voltage output from the power supply stepwise by changing the resistance value.

  According to this configuration, a detection voltage that is changed stepwise according to the rotation angle of the detection target can be output with a simple circuit configuration including a power source and a variable resistance circuit.

  According to the present invention, in the angle detection sensor, the detection target is swung around a neutral position, the plurality of detection units are two detection units, and the number of detection units varies according to the swing angle of the detection target. The voltage output unit outputs the detection voltage based on the binarized signal to the device that switches the drive mode in multiple stages, thereby switching the device. It is characterized by controlling.

  According to this configuration, the switching operation of the apparatus can be controlled by four kinds of control according to the swing angle of the detection target.

  According to the present invention, in the angle detection sensor, the voltage output unit prohibits switching of the drive mode when the swing angle of the detection target is within a first angle range centered on the neutral position. A detection voltage is output, and when the swing angle of the detection target is within a second angle range adjacent to the upper side of the first angle range, a detection voltage for switching the drive mode to the upper side is output, and the detection When the swing angle of the target is within a third angle range adjacent to the lower side of the first angle range, a detection voltage for switching the drive mode is output to the lower side, and the swing angle of the detection target is A detection voltage indicating an error is output when the second angle range or the third angle range is exceeded.

  According to this configuration, the swing angle of the detection target exceeds the insensitive area where switching of the driving mode is prohibited within a certain angle range centered on the neutral position, and the insensitive area is exceeded, and the driving mode is set to the upper and lower stages. Detection can be performed separately for a switching area to be switched and an error area that exceeds the switching area and in which an error is detected.

  According to the present invention, in a device that is applied to a device that switches a drive mode according to a rotation angle of a detection target, a detection voltage can be output stepwise with respect to the rotation angle of the detection target with a simple processing configuration. it can.

It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is a perspective view which removed the cover and the insulated substrate from the angle detection sensor. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is sectional drawing of an angle detection sensor. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is a circuit block diagram of a detection unit and a variable resistance circuit. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is explanatory drawing of the relationship between an angle range and a binarization signal. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is a figure which shows an example of the characteristic view of a detection voltage. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is a schematic diagram at the time of applying an angle detection sensor to the apparatus which can switch a drive mode in multiple steps. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is explanatory drawing of the angle range of the rocking | fluctuation angle of a rocking | fluctuation shaft. It is a figure which shows embodiment of the angle detection sensor which concerns on this invention, and is a figure which shows an example of the characteristic view of a detection voltage at the time of applying an angle detection sensor to the apparatus which can switch a drive mode in multiple steps.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view in which a cover and an insulating substrate are removed from the angle detection sensor according to the present embodiment. FIG. 2 is a cross-sectional view of the angle detection sensor according to the present embodiment.

  As shown in FIG. 1 or FIG. 2, the angle detection sensor 1 outputs a stepped detection voltage according to the rotation angle of a rotation shaft (not shown) as a detection target. A cover 3 that closes the opening on the side opposite to the insertion port side of the shaft is provided. The case 2 extends in a direction orthogonal to the cylindrical part 5 from the peripheral wall part 4, a cylindrical part 5 extending radially outward from a part of the peripheral wall part 4, and the cylindrical part 5. A pair of fixing portions 6.

  The peripheral wall portion 4 is formed with a shaft housing portion 11 for housing the shaft 7 attached to the rotating shaft and a substrate housing portion 12 for housing the insulating substrate 8 connected to the shaft housing portion 11. The shaft accommodating portion 11 is provided with a bearing 13 and a U-shaped packing 14, and the shaft 7 is rotatably accommodated via the bearing 13 and the U-shaped packing 14. The substrate housing portion 12 is formed with an inner peripheral surface that matches the outer shape of the insulating substrate 8, and the insulating substrate 8 is accommodated in a positioned state.

  A shaft hole 15 is formed in the shaft 7, and a rotation shaft is fixed via a leaf spring 16 attached to the shaft hole 15. An annular magnet 18 is provided at the end of the shaft 7 on the insulating substrate 8 side via a magnet holder 17. The magnet 18 is configured to be able to rotate integrally with the shaft 7 via the magnet holder 17 and changes the magnetic field according to the rotation angle of the rotating shaft.

  A detection unit 19 is provided on one surface of the insulating substrate 8 on the shaft 7 side so as to face the magnet 18. The detection unit 19 includes first and second detection units 21 and 22 (see FIG. 3), and the rotation angle of the shaft 7 (rotation axis) is magnetically changed according to a change in the magnetic field generated from the magnet 18. To detect. Each of the first and second detection units 21 and 22 has a magnetoresistive effect element such as a GMR element, converts a signal detected by the magnetoresistive effect element into a binarized signal, and outputs it.

  A voltage output circuit 31 (see FIG. 3) is formed on the insulating substrate 8. The voltage output circuit 31 changes the voltage level of the detection voltage stepwise by varying the resistance value based on the binarized signal output from the detection unit 19. The details of the circuit configuration of the voltage output circuit will be described later.

  Three external terminals 24 are embedded in the partition wall 23 that partitions the peripheral wall portion 4 and the cylindrical portion 5. Each external terminal 24 is an L-shaped pin-type terminal, one end of which projects into the cylindrical portion 5 and the other end is connected to the insulating substrate 8. Each external terminal 24 is connected to the detection unit 19 through a conductor pattern formed on the insulating substrate 8.

  An annular groove 25 is formed at the end of the peripheral wall portion 4 on the insertion port side of the rotation shaft, and an O-ring 26 is attached to the annular groove 25. A fixed hole 27 is formed in each of the pair of fixed portions 6, and a fastening member is inserted through the fixed hole 27 to fix the angle detection sensor 1 at a predetermined location.

  Next, the circuit configuration of the detection unit and the voltage output circuit will be briefly described with reference to FIG. FIG. 3 is a circuit configuration diagram of the detection unit and the voltage output circuit according to the embodiment of the present invention.

  As shown in FIG. 3, the magnet 18 is formed by alternately magnetizing S poles and N poles along the circumferential direction. The detection unit 19 is arranged at a predetermined interval with respect to the magnet 18 and has first and second detection units 21 and 22. The first and second detection units 21 and 22 are arranged side by side along the rotation direction of the magnet 18, and each includes a magnetoresistive effect element disposed to face the magnet 18.

  The first and second detection units 21 and 22 generate a binarized signal based on the direction and magnitude of the magnetic flux acting on the magnetoresistive effect element, and output the binarized signal to the voltage output circuit 31. This binarized signal is a pulse signal in which “1” is greater than or equal to a predetermined threshold and “0” is less than the predetermined threshold among outputs from each magnetoresistive effect element. In this case, the predetermined threshold is set to a value that can detect the switching of the magnetic poles of the magnet 18 facing each magnetoresistive element. Therefore, the output value of the binarized signal is continuously varied in accordance with the switching of the magnetic poles of the magnet 18 facing each magnetoresistive element.

  The voltage output circuit 31 has a series circuit including resistors R1 to R5 provided between the positive terminal of the power supply 32 and the ground. The connection point between the resistors R1 and R2 is connected to the output terminal 33, and the collectors and emitters of the switching transistors T1-T3 are connected to both ends of the resistors R2-R4, respectively. Input lines L1-L3 connected to the integrated circuit 34 are connected to the bases of the switching transistors T1-T3.

  The integrated circuit 34 applies a drive voltage to the bases of the switching transistors T1 to T3 based on the binarized signals input from the first and second detection units 21 and 22. By applying a driving voltage from the integrated circuit 34, ON / OFF of each switching transistor T1-T3 is controlled, and the resistance value of the voltage output circuit 31 is varied. In this case, the integrated circuit 34 includes four binary values “1, 0”, “1, 1”, “0, 1”, “0, 0” from the first and second detection units 21 and 22. Since the combination of the control signals is input, the resistance value of the voltage output circuit 31 is varied in four stages.

  Specifically, when a combination of binary signals of “1, 0” is input from the first and second detection units 21 and 22 to the integrated circuit 34, the integrated circuit 34 turns on the switching transistors T1 and T2. To control. As a result, the collector-emitter of the switching transistors T1 and T2 are conducted, and the output voltage from the power supply 32 is divided by the combined resistance of the resistor R1 and the resistors R4-R5 and output to the output terminal 33.

  When a combination of binary signals “1, 1” is input from the first and second detection units 21 and 22 to the integrated circuit 34, the integrated circuit 34 controls the switching transistor T1 to be ON. As a result, the collector-emitter of the switching transistor T1 is conducted, and the output voltage from the power supply 32 is divided by the combined resistance of the resistor R1 and the resistors R3-R5 and output to the output terminal 33.

  When a combination of binary signals “0, 1” is input from the first and second detection units 21 and 22 to the integrated circuit 34, the integrated circuit 34 controls all the switching transistors T1-T3 to be OFF. As a result, the output voltage from the power supply 32 is divided by the combined resistance of the resistor R1 and the resistors R2-R5 and output to the output terminal 33.

  When a combination of binary signals “0, 0” is input from the first and second detection units 21 and 22 to the integrated circuit 34, the integrated circuit 34 controls all the switching transistors T1 to T3 to be ON. As a result, the collector-emitter of the switching transistors T1-T3 is conducted, and the output voltage from the power source 32 is divided by the resistors R1 and R5 and output to the output terminal 33.

  For example, as shown in FIG. 5A, the detection voltage output from the output terminal 33 has a stepped voltage level that changes according to the magnitude of the combined resistance between the output terminal 33 and the ground. In this case, each combination of the binarized signals is “0, 0”, “1, 0”, “1, 1”, “0, 1” in this order, and the voltage levels are 0.5 V, 1.5 V, 2. 5V and 3.5V are set. Each combination of the binarized signals corresponds to four angle ranges, and the rotation angle of the rotating shaft is detected stepwise by the output range of the binarized signal combination.

  In this way, since the detection voltage corresponding to the rotation angle of the magnet 18 is output in a stepped manner, fluctuations in the detection voltage due to mechanical backlash or the like of the rotating shaft are absorbed. Hereinafter, the relationship between the angle range and the binarized signal will be described with reference to FIG. FIG. 4 is an explanatory diagram of the relationship between the angle range and the binarized signal according to the embodiment of the present invention, where (a) is a plan view of the magnet, and (b) is the magnetization pitch and the first and second magnets. The figure which shows the relationship with the arrangement | positioning space | interval of this detection part, (c), (d) is an output characteristic figure of the 1st, 2nd detection part.

  As shown in FIG. 4A, in the present embodiment, the magnet 18 is formed in an annular shape, and N poles and S poles are alternately magnetized at intervals of 30 degrees. Therefore, the first and second detection units 21 and 22 respectively switch “1” and “0” as the binarized signals at intervals of 30 degrees and output them. As shown in FIG. 4B, the first and second detectors 21 and 22 have an interval of λ / 3 along the rotation direction of the magnet 18 when the magnetization pitch of the magnet 18 is λ. It is arranged with a gap.

  As shown in FIG. 4C, the first and second detection units 21 and 22 are arranged with an interval of λ / 3, and are output from the first and second detection units 21 and 22, respectively. The binarized signal is output with a deviation of 10 degrees, which is an angle of 1/3 of 30 degrees corresponding to the magnetization pitch λ. As described above, the first and second detection units 21 and 22 are arranged at intervals between the magnetization pitch λ, so that four types of binarization are performed from the first and second detection units 21 and 22. A combination of signals is output.

  The binarized signal combination “0, 0” is output in the angle range A where the first and second detection units 21 and 22 both face the S pole, and the binarized signal combination “1, 0” The first detection unit 21 is output in an angular range B where the second detection unit 22 faces the north pole and the second detection unit 22 faces the south pole. Also, the binarized signal combination “1, 1” is output in the angle range C where both the first and second detection units 21 and 22 face the N pole, and the binarized signal combination “0, 1” is output. "Is output in an angular range D in which the first detection unit 21 faces the south pole and the second detection unit 22 faces the north pole.

  The angle range A and the angle range C are set to 20 degrees, and the angle range B and the angle range D are set to 10 degrees. As shown in FIG. 5 (a), the detection voltage at this time is an output interval of 2.5V corresponding to the angle range C, and an output of 1.5V and 3.5V corresponding to the angle range B and the angle range D. It is set to twice the interval. Thus, the angle range can be adjusted by changing the distance between the first and second detection units 21 and 22.

  For example, as shown in FIG. 4 (d), when the first and second detection units 21 and 22 are arranged with an interval of λ / 4, output from the first and second detection units 21 and 22. The binarized signal to be output is shifted by 7.5 degrees, which is a quarter angle of 30 degrees corresponding to the magnetization pitch λ. Therefore, the angle range A and the angle range C are set to 22.5 degrees, and the angle range B and the angle range D are set to 7.5 degrees. As shown in FIG. 5B, the detected voltage at this time is an output interval of 2.5 V corresponding to the angle range C, and an output of 1.5 V and 3.5 V corresponding to the angle range B and the angle range D. It is set to 3 times the interval.

  Next, the case where the above-described angle detection sensor is applied to an apparatus capable of switching drive modes in multiple stages will be described. FIG. 6 is a schematic diagram when the angle detection sensor according to the embodiment of the present invention is applied to an apparatus capable of switching drive modes in multiple stages.

  As shown in FIG. 6, the angle detection sensor 1 is attached to an operation unit 42 for switching the drive mode of the device 41. The shaft 7 of the angle detection sensor 1 is provided with a swing shaft 43 of the operation unit 42, and the swing shaft 43 is configured to swing within a predetermined angle range. The device 41 is connected to the external terminal 24 of the angle detection sensor 1, and controls the drive mode switching operation based on the detection voltage output according to the rotation angle of the swing shaft 43.

  The swing shaft 43 is configured to be rotatable by 20 degrees on the upper side and 20 degrees on the lower side with respect to the neutral position. As shown in FIG. 4C, the angle detection sensor 1 magnetizes the magnets 18 at intervals of 30 degrees, and arranges the first and second detection units 21 and 22 at intervals of λ / 3. Therefore, as shown in FIG. 7, the swing range of the swing shaft 43 is a first angle range of ± 10 degrees centered on the neutral position, a second angle range from +10 degrees to +20 degrees, and −10 degrees. Is divided into a third angle range of -20 degrees and a fourth angle range other than that.

  The first angle range indicates a dead area where the drive mode switching operation of the device 41 is prohibited, and the second angle range indicates an upper-side switch region where the drive mode of the device 41 is switched to the upper side. The third angle range indicates a lower-side switching area for switching the drive mode of the device 41 to the lower-stage side, and the fourth angle range indicates an error area exceeding the swinging range of the swinging shaft 43. Yes.

  At this time, as shown in FIG. 8, the swing angle of the swing shaft 43 is 0.5 V when it is in the error region, 1.5 V when it is in the lower switching region, and 2 when it is in the insensitive region. The detected voltage of 3.5 V is output from the angle detection sensor 1 to the device 41 when it is in the upper switching region of .5 V. Note that the angle ranges of the respective regions described above may vary, for example, in a range where the upper limit value and the lower limit value of each region are ± 2 degrees.

  When the operation unit 42 is not operated or the operation amount is small, the swing angle of the swing shaft 43 is positioned within the first angle range, and a detection voltage of 2.5 V from the angle detection sensor 1 is applied to the device. 41 is output. When a detection voltage of 2.5 V is input from the angle detection sensor 1, the device 41 prohibits the drive mode switching operation. As described above, by providing the insensitive area where the switching operation of the drive mode is prohibited, it is possible to prevent an error movement due to mechanical shaking of the swing shaft 43.

  From this state, when the swing shaft 43 is moved upward by the operation of the operation unit 42 and the swing angle of the swing shaft 43 exceeds the first angle range and is positioned in the second angle range, the angle detection sensor A detection voltage of 1 to 3.5 V is output to the device 41. When a detection voltage of 3.5 V is input from the angle detection sensor 1, the device 41 switches the drive mode to the next level. Further, when the swing shaft 43 is moved upward by the operation of the operation unit 42 and the swing angle of the swing shaft 43 is positioned in the fourth angle range beyond the second angle range, the angle detection sensor 1 A detection voltage of 0.5 V is output to the device 41. When a detection voltage of 0.5 V is input from the angle detection sensor 1, the device 41 notifies the user that the operation unit 42 has failed.

  On the other hand, when the swing shaft 43 is moved downward by the operation of the operation unit 42 and the swing angle of the swing shaft 43 is positioned in the third angle range beyond the first angle range, the angle detection sensor 1 A detection voltage of 1.5 V is output to the device 41. When a detection voltage of 1.5 V is input from the angle detection sensor 1, the device 41 switches the drive mode one step down. Further, when the swing shaft 43 is moved downward by the operation of the operation unit 42 and the swing angle of the swing shaft 43 exceeds the third angle range and is positioned in the fourth angle range, the angle detection sensor 1 A detection voltage of 0.5 V is output to the device 41. When a detection voltage of 0.5 V is input from the angle detection sensor 1, the device 41 notifies the user that the operation unit 42 has failed.

  As described above, according to the angle detection sensor 1 according to the present embodiment, the detected voltage becomes the rotation angle of the rotation shaft based on the binarized signals output from the first and second detection units 21 and 22. Accordingly, since the voltage is output at a stepped voltage level, fluctuations in the detected voltage due to mechanical backlash of the rotating shaft are absorbed. Therefore, when applied to a device that switches the drive mode in accordance with the rotation angle of the rotation shaft, malfunction of switching is prevented. In addition, since the rotation angle of the rotation shaft is binarized in the first and second detection units, a numerical correspondence table is not required as compared with the conventional angle detection sensor, and the voltage output circuit 31 has a simple circuit configuration. It becomes possible to do. Furthermore, since the 1st, 2nd detection parts 21 and 22 are arrange | positioned between the magnetization pitches of the magnet 18, it respond | corresponded to the magnetization pitch according to the arrangement interval of the 1st, 2nd detection parts 21 and 22. It becomes possible to detect the angle range by dividing it into four.

  In the above-described embodiment, the rotation shaft and the swing shaft of the operation unit are exemplified as the detection target. However, the present invention is not limited to this configuration. Any configuration may be used as long as it can rotate with the magnet and the rotation angle is detected stepwise.

  In the above-described embodiment, the magnetoresistive effect element such as a GMR sensor is exemplified as the magnetic sensor. However, the present invention is not limited to this configuration. Any device that can detect a change in magnetic flux due to rotation of the magnet may be used. For example, a Hall element may be used as the magnetic sensor.

  In the above-described embodiment, the binarized signal is output by the two detection units. However, the present invention is not limited to this configuration. It is good also as a structure which outputs a binarization signal by three or more detection parts, and divides and detects the rotation angle of a detection target in five steps or more.

  In the above-described embodiment, the resistance value of the voltage output circuit is variable by combining a series circuit including a plurality of resistors and a switching transistor. However, the present invention is not limited to this configuration. Any configuration is possible as long as the detection voltage can be changed stepwise by varying the resistance value.

  In the above-described embodiments, the present invention has been described by exemplifying a configuration used in an apparatus capable of switching drive modes in multiple stages. However, the present invention is not limited to this configuration. The application target of the angle detection sensor according to the present embodiment may be any one as long as it is driven using the rotation angle of the detection target detected in stages, and can be changed as appropriate.

  In the above-described embodiment, the voltage output circuit is formed on the insulating substrate. However, the present invention is not limited to this configuration, and the voltage output circuit may be formed in the detection unit.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, the present invention is applied to a device that switches the drive mode according to the rotation angle of the detection target, and the detection voltage is stepped with respect to the rotation angle of the detection target with a simple processing configuration. In particular, the present invention is useful for an angle detection sensor that outputs a detection voltage stepwise with respect to a rotation angle of a detection target.

DESCRIPTION OF SYMBOLS 1 Angle detection sensor 2 Case 7 Shaft 8 Insulating board 15 Shaft hole 17 Magnet holder 18 Magnet 19 Detection unit 21 1st detection part 22 2nd detection part 31 Voltage output circuit (voltage output part)
32 Power supply (Voltage output unit)
33 Output terminal (Voltage output section)
34 Integrated circuit (voltage output unit)
41 Device 42 Operation unit 43 Oscillating shaft (detection target)

Claims (4)

A magnet that can rotate with the object to be detected;
A plurality of detection units that have a magnetic sensor that outputs a signal corresponding to a change in magnetic flux due to rotation of the magnet, and binarizes and outputs the signal output from the magnetic sensor;
A voltage output unit that outputs a detection voltage whose voltage level is changed stepwise based on the binarized signals output from the plurality of detection units;
The angle detection sensor, wherein the plurality of detection units are arranged between the magnetized pitches of the magnets along a rotation direction of the magnets.   The voltage output unit includes a power source and a variable resistance circuit that changes a resistance value in a stepwise manner based on the binarized signals output from the plurality of detection units, and the voltage of the voltage output from the power source The angle detection sensor according to claim 1, wherein the detection voltage is output by changing a level stepwise by changing the resistance value. The detection object is swung around a neutral position,
The plurality of detection units are two detection units, and output four combinations of binarized signals according to the swing angle of the detection target,
The voltage output unit controls a switching operation of the device by outputting a detection voltage based on the binarized signal to a device that switches a driving mode in multiple stages. Item 3. The angle detection sensor according to Item 2.   The voltage output unit outputs a detection voltage for prohibiting switching of the drive mode when the swing angle of the detection target is within a first angle range centered on the neutral position, and the swing of the detection target is When the moving angle is in a second angle range adjacent to the upper side of the first angle range, a detection voltage for switching the drive mode is output to the upper stage side, and the swing angle of the detection target is the first angle range. When it is within a third angle range adjacent to the lower side of the angle range, a detection voltage for switching the drive mode is output to the lower stage side, and the swing angle of the detection target is the second angle range or the third angle range. The angle detection sensor according to claim 3, wherein a detection voltage indicating an error is output when the angle range is exceeded.

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