ROTATION DETECTION DEVICE

Abstract

A rotational sensing device comprising a substrate with an insertion hole for a rotating shaft, a magnetic field generating element rotating with the rotating shaft, a plurality of magnetic sensors arranged around the magnetic field generating element, a housing accommodating the plurality of magnetic sensors and provided on the substrate, an optical sensor provided on the substrate on the side facing away from the plurality of magnetic sensors, and an optical disk facing the substrate, the optical sensor being positioned between them and rotating with the rotating shaft, the device having an adjustment mechanism configured to adjust the position of the plurality of magnetic sensors relative to the magnetic field generating element by adjusting the position of the housing relative to the substrate.as soon as the position of the optical sensor relative to the optical disk has been set and the substrate has been positioned precisely.

Description

BACKGROUND CROSS-REFERENCE TO RELATED REGISTRATIONS

[0001] This application claims priority over Japanese patent application No. 2024-218373, filed on December 13, 2024, the contents of which are incorporated herein by reference in their entirety for all purposes. [Area]

[0002] The present invention relates to a rotation detection device comprising magnetic sensors that utilize the large Barkhausen effect and an optical sensor. [State of the art]

[0003] A magnetic sensor utilizing the large Barkhausen effect comprises a magnet wire that generates the large Barkhausen effect, a coil former in which the magnet wire is mounted, a coil formed by winding an electrical wire around the coil former, and two terminals used to connect the coil to an external sensing circuit. The two terminals are attached to opposite ends of the coil former. One end of the electrical wire forming the coil is connected to one terminal, and the other end of the electrical wire forming the coil is connected to the other terminal. The magnetic sensor is electrically connected to circuits on a substrate, for example, by soldering the respective ends of the two terminals to the substrate.Additionally, soldering each connection secures the magnetic sensor to the substrate and fixes the position of the magnetic sensor on the substrate.

[0004] When magnetic sensors are used to detect the rotation of a rotating shaft, as in the rotation detection device disclosed in patent document 1, magnets are attached to the outer circumference of the rotating shaft such that a rotating magnetic field is generated on the outer circumference of the rotating shaft when the shaft rotates. Furthermore, several magnetic sensors are provided on the substrate, and this substrate is positioned on the outer circumference of the rotating shaft in a manner that is free from contact with either the rotating shaft or the magnets. The multiple magnetic sensors are arranged near the path of rotation of the magnets at locations that differ from one another in the direction of rotation of the magnets. This allows the rotating magnetic field generated by the rotation of the rotating shaft to be detected by the multiple magnetic sensors, and the magnitude and direction of rotation, etc., to be determined.the rotating shaft is detected based on detection signals output by the coil of each magnetic sensor. [Patent documents]

[0005] [Patent Document 1] International Publication No. 2016 / 021074 SUMMARY [Problems to be solved]

[0006] For example, when constructing a rotary sensing device that detects the rotation of a rotating shaft using magnetic sensors, a substrate with the magnetic sensors mounted on it is provided on the outer circumference of the rotating shaft. Traditionally, when manufacturing such a rotary sensing device, the magnetic sensors are first attached to the substrate by soldering, and the substrate to which the magnetic sensors are attached is then secured, for example, to a housing or similar structure in which the rotating shaft is rotatably mounted, using brackets, supports, and the like.

[0007] To increase the accuracy with which the rotation of the rotating shaft is detected by the magnetic sensors, the magnetic sensors must be arranged such that their position relative to the magnets rotating with the shaft, including the distance between the axis of the rotating shaft and the magnetic sensors, etc., corresponds to the design position. Otherwise, during the manufacturing process of the rotation detection device, the position of the magnetic sensors relative to the magnets may occasionally deviate from the design position.

[0008] It is assumed that one reason for the misalignment of the magnetic sensors relative to the rotating shaft is that the sensors become misaligned during the soldering process, when they are soldered to the substrate. Another reason is that the substrate becomes misaligned during the substrate mounting process, when the substrate to which the magnetic sensors are soldered is attached to the housing, and so on, in which the rotating shaft is rotatably mounted. Therefore, to position the magnetic sensors so that their position relative to the rotating shaft corresponds to the design position, both the precise positioning of the magnetic sensors relative to the substrate during the soldering process and the precise positioning of the substrate relative to the housing, etc., are necessary.The substrate mounting process must be carried out in a strict and methodical manner. For this reason, it is not easy to arrange the magnetic sensors in such a way that their position relative to the rotating shaft corresponds to the design position.

[0009] Additionally, the rotation detection device houses several magnetic sensors within a casing, and the casing is attached to the substrate using screws. To ensure the magnetic sensors are positioned as designed, corresponding screw holes are provided in the casing and substrate in a one-to-one relationship. However, since the ideal position of the magnetic sensors relative to the magnets can vary slightly from device to device depending on the relationship between the magnets and the sensors, it is difficult to precisely align the sensors based on this relationship in a configuration where the casing is fixed to the substrate.

[0010] Additionally, rotation detection devices include devices comprising magnetic sensors and an optical sensor. In such a case, once the optical sensor has been positioned appropriately according to a relationship between an optical disk rotating with the rotating shaft and the optical sensor, it is difficult to position the magnetic sensors appropriately based on the relationship between the magnets rotating with the rotating shaft and the magnetic sensors themselves.

[0011] The present invention was produced by paying particular attention to problems such as those described above, and it is an object of the present invention to provide a rotation detection device which makes it possible to easily arrange the magnetic sensors and the optical sensor such that the positions of the magnetic sensors relative to the magnets and of the optical sensor relative to the optical disk each correspond to their design positions. [Technical solution]

[0012] It is an objective of the present disclosure to easily arrange magnetic sensors and an optical sensor such that the positions of the magnetic sensors relative to the magnets and of the optical sensor relative to the optical disk each correspond to their design positions.

[0013] To eliminate the aforementioned problems, the rotation detection device according to the invention, which is a rotation detection device that detects the rotation of a rotating body, comprises a single substrate with an insertion hole into which the rotating body is inserted, a magnetic field generating element that rotates with the rotation of the rotating body, several magnetic sensors arranged around the magnetic field generating element, a housing that accommodates the several magnetic sensors and is provided on the substrate, an optical sensor provided on the substrate on the side facing away from the several magnetic sensors, and an optical disk facing the substrate, with the optical sensor arranged between them, and which rotates with the rotation of the rotating body, and is characterized in that it has an adjustment mechanism that is configured toThe position of the multiple magnetic sensors relative to the magnetic field generating element is adjusted by adjusting the position of the housing relative to the substrate, once the position of the optical sensor relative to the optical disk has been set and the substrate has been accurately positioned.

[0014] According to the present invention, the magnetic sensors can be easily attached by simply adjusting the design position relationship between the magnetic field generating element and the magnetic sensors used to detect the rotation of the rotating body, by attaching the housing to the substrate on which the optical sensor is provided, without affecting the position relationship between the optical disk and the optical sensor.

[0015] Additionally, the above-mentioned rotation detection device according to the invention can include coupling elements that couple the housing and the substrate, the substrate can have coupling holes through which the coupling elements are inserted, and the housing can have first adjustment holes as the adjustment mechanism, which are designed with a diameter that is larger than that of the coupling elements by a predetermined adjustment width, and through which the coupling elements are inserted.

[0016] Additionally, the housing in the above-mentioned rotation detection device according to the invention can have a second adjustment hole as the adjustment mechanism, which is designed with a diameter that is larger than that of the insertion hole by a predetermined adjustment width, and into which the rotating body and the magnetic field generating element are inserted.

[0017] In addition, the magnetic sensors and the substrate in the above-mentioned rotation detection device according to the invention each comprise first terminals and second terminals that are placed in mutual contact, and as the adjustment mechanism, one type of terminal, i.e., the first terminal or the second terminal, can be designed as a compression terminal, and the other type of terminal can be designed as a conductor section whose contact area is larger than that of the compression terminal by a predetermined adjustment width. [Technical effect]

[0018] The present invention can provide a rotation detection device that makes it possible to easily arrange the magnetic sensors and the optical sensor such that the positions of the magnetic sensors relative to the magnets and of the optical sensor relative to the optical disk each correspond to their design positions. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 illustrates a perspective top view of a rotation detection device according to an embodiment of the present invention. Fig. Figure 2 illustrates a top view of a rotation detection device according to an embodiment of the present invention. Fig. Figure 3 illustrates a side view of a cross-section of the rotation detection device along section line III-III in Fig. 2. Fig. Figure 4 illustrates a top view of a substrate in a rotation detection device according to an embodiment of the present invention. Fig. Figure 5 illustrates a top view of a magnetic sensor device in a rotation detection device according to an embodiment of the present invention. Fig. Figure 6 illustrates a bottom view of a magnetic sensor device in a rotation detection device according to an embodiment of the present invention. Fig. Figure 7 illustrates a top view of magnetic sensors and yokes in a rotation detection device according to an embodiment of the present invention. Fig. Figure 8 illustrates a perspective top view of magnetic sensors and yokes in a rotation detection device according to an embodiment of the present invention. Fig. Figure 9 illustrates a perspective top view of a magnetic sensor in a rotation detection device according to an embodiment of the present invention. Fig. Figure 10 illustrates a perspective bottom view of a magnetic sensor in a rotation detection device according to an embodiment of the present invention. Fig. Figure 11 illustrates a perspective top view of a magnetic sensor in a rotation detection device according to an embodiment of the present invention, wherein the coil is removed. Fig. Figure 12 illustrates a perspective top view of a magnetic sensor connection in a rotation detection device according to an embodiment of the present invention. Fig. Figure 13 illustrates a method for accurately positioning the magnetic sensor device in a rotation detection device according to an embodiment of the present invention. Fig. Figure 14 illustrates a perspective top view of a magnetic sensor connection in a rotation detection device according to another embodiment of the present invention. DETAILED DESCRIPTION (Rotational Detection Device)

[0019] A rotation detection device 1 according to an embodiment of the present invention will now be described with reference to the drawings. Fig. Figure 1 is a perspective top view of the rotation detection device 1 and Fig. Figure 2 is a top view of the rotation detection device 1. Fig. 3 is a side view (top left in Fig. 2) of a cross-section of the rotation detection device 1 along the section line III-III in Fig. 2.

[0020] The rotation detection device 1 is a device that detects the rotation of a rotating shaft 100, which serves as a rotating body. For example, the rotating shaft 100 is the output shaft of a motor, and the rotation detection device 1 is mounted with the motor. The rotating shaft 100, which is rotatably mounted on the motor, projects upwards from the top of the motor housing 101.

[0021] The rotation detection device 1 comprises a single substrate 2, a magnetic field generating element 3 that generates a rotating magnetic field, a magnetic sensor device 4 that detects the rotating magnetic field, an optical disk 5 that generates light to be detected, and an optical sensor 6 that detects the light to be detected. (substrate)

[0022] The substrate 2 is provided on the outer circumference of the rotating shaft 100 and in the vicinity of the magnetic field generating element 3. Fig. Figure 4 is a top view of the substrate 2. The substrate 2, which is formed in a disk-like configuration, is arranged in an orientation in which its plane is perpendicular to the axis of rotation of the rotating shaft 100.

[0023] A round insertion hole 10 is formed coaxially with the rotating shaft 100 in the central section of the substrate 2, and the rotating shaft 100 is inserted into the insertion hole 10. The insertion hole 10 has a diameter larger than the outer diameter of the magnetic field-generating element 3, which is provided around the circumference of the rotating shaft 100, and the substrate 2 is arranged such that the rotating shaft 100 and the magnetic field-generating element 3 do not come into contact with the edge of the insertion hole 10, i.e., the substrate 2. Once the rotating shaft 100 has been inserted into the insertion hole 10, the substrate 2 is fastened to the housing 101 of the motor by means of support posts 102.

[0024] The substrate 2 has mounting holes 11 through which bolts and other fasteners 12 are inserted, and is fastened to the housing 101 by attaching the fasteners 12, which are inserted through the mounting holes 11, to the support posts 102. The mounting holes 11 have a diameter that is generally the same as the diameter of the shaft sections of the fasteners 12.

[0025] Additionally, the substrate 2 has coupling holes 13 for coupling to the magnetic sensor device 4, through which bolts and other coupling elements 14 are inserted, and the coupling elements 14, which are inserted through the magnetic sensor device 4 (first adjustment holes 40) and the coupling holes 13, are attached to the support posts 102. The coupling holes 13 are designed with a diameter that is generally the same as the diameter of the shaft sections of the coupling elements 14.

[0026] Electrical and electronic components other than the magnetic sensor device 4 are mounted on the top and bottom surfaces of the substrate 2 by soldering and the like. Pads and other conductor sections 15 (secondary connections) used for electrical connection to the magnetic sensor device 4 are, for example, mounted on the top surface of the substrate 2. In particular, the conductor sections 15 are aligned with terminals 33 (primary connections) provided in the magnetic sensors 20 of the magnetic sensor device 4 and are configured to have a contact area larger than that of the terminals 33 by a predetermined width. For example, the conductor sections 15 for terminals 33 with dimensions of approximately 0.6 mm are configured to have a contact area measuring approximately 2 mm by 2 mm. Additionally, an optical sensor 6 is mounted on the bottom surface of the substrate 2. (Magnetic field generating element)

[0027] The magnetic field generating element 3 is formed in a ring-shaped configuration from, for example, ferrite or other magnetic materials. After being arranged coaxially with and attached to the outer circumference of the rotating shaft 100, the magnetic field generating element 3 rotates with the rotation of the rotating shaft 100. The magnetic field generating element 3 is arranged on the substrate 2 within the magnetic sensors 20 of the magnetic sensor device 4. The magnetic field generating element 3 is a multipole magnetized magnet with four magnetic poles, i.e., an N pole, an S pole, an N pole, and an S pole, which are formed in this order in the outer circumferential section of the magnetic field generating element 3 at intervals of, for example, 90 degrees in the circumferential direction of the magnetic field generating element 3. Alternatively, the magnetic field generating element 3 can be formed from four magnets that are not multipole magnetized.

[0028] Because the magnetic field generating element 3 rotates with the rotation of the rotating shaft 100 when a magnetic field is to be generated at the outer circumference of the magnetic field generating element 3, the magnetic field generated by the magnetic field generating element 3 is set into rotation. This forms a rotating magnetic field that rotates around the axis of rotation of the rotating shaft 100. (Magnetic sensor device)

[0029] Fig. Figure 5 is a top view of the magnetic sensor device 4 and Fig. Figure 6 is a bottom view of the magnetic sensor device 4. The magnetic sensor device 4 comprises several magnetic sensors 20 (three magnetic sensors 20 in the present embodiment), several yokes 21 (three yokes 21 in the present embodiment) and a housing 22. The magnetic sensor device 4 is arranged on the top side of the substrate 2. Fig. Figure 7 is a top view of the three magnetic sensors 20 and three yokes 21 and Fig. Figure 8 is a perspective top view of the three magnetic sensors 20 and three yokes 21.

[0030] The three magnetic sensors 20, which detect the rotating magnetic field generated by the magnetic field generating element 3, are identical to each other. The three yokes 21, which control the direction of the magnetic flux of the magnetic field generated by the magnetic field generating element 3, are also identical to each other. The magnetic sensor device 4 is formed as a single body by housing and securing the three magnetic sensors 20 and three yokes 21 within a single housing 22. For example, the three magnetic sensors 20 are secured by each fitting into three sensor mounting holes provided in the bottom of the housing 22, and the three yokes 21 are embedded within the housing 22 by overmolding. Within the housing 22, the three magnetic sensors 20 are arranged in a single reference plane that is positioned coplanar with the bottom of the housing 22. Fig. 5 are the three magnetic sensors 20 and three yokes 21, which are housed inside the casing 22, shown in dashed lines.

[0031] As described below, the magnetic sensor device 4 in the housing 22 has several round first adjustment holes 40, which correspond to the coupling holes 13 in the substrate 2, and a round second adjustment hole 41, which corresponds to the insertion hole 10 in the substrate 2. The housing 22 is described in detail below. Once the second adjustment hole 41 has been aligned with the insertion hole 10 and, in addition, the first adjustment holes 40 have been aligned with the coupling holes 13, the magnetic sensor device 4 is positioned on the substrate 2 by allowing the underside of the housing 22 to rest on the substrate 2. Furthermore, as a result of attaching the coupling elements 14, which are inserted through the first adjustment holes 40 and the coupling holes 13, to the support posts 102, the magnetic sensor device 4 is coupled to the substrate 2 and secured to the housing 101.

[0032] Once the magnetic sensor device 4 has been positioned on the substrate 2 in this manner, the three magnetic sensors 20 and three yokes 21 are arranged on the substrate 2. The three magnetic sensors 20 are arranged radially outside the second adjustment hole 41 at intervals of 120 degrees around the circumference of the second adjustment hole 41. The three yokes 21 are arranged in a one-to-one correspondence with the three magnetic sensors 20, with each yoke 21 positioned radially inside the corresponding magnetic sensor 20 such that it is adjacent to the magnetic sensor 20. Similarly, the three yokes 21 are arranged radially outside the second adjustment hole 41 at intervals of 120 degrees around the circumference of the second adjustment hole 41.

[0033] As in Fig. 9 and Fig. As shown in Figure 10, each magnetic sensor 20 has a magnetic wire rod 30 that generates the large Barkhausen effect. Each magnetic sensor 20 is arranged such that the direction of extension of the magnetic wire rod 30 is parallel to the plane of the substrate 2 and, viewed from above, the central section of the magnetic wire rod 30 is tangential in its direction of extension to a predefined circle that is coaxial with the second adjustment hole 41, which is arranged radially outside the magnetic field generating element 3.

[0034] The three magnetic sensors 20 and three yokes 21 are arranged in a manner that is free from contact with the magnetic field generating element 3. While the magnetic field generating element 3 rotates with the rotating shaft 100, which rotates relative to the housing 101, the magnetic sensor device 4, which is arranged on the substrate 2, remains stationary and does not rotate relative to the housing 101. The three magnetic sensors 20 provided in the magnetic sensor device 4 detect the rotating magnetic field generated around the circumference of the magnetic field generating element 3. In particular, due to the rotation of the magnetic field generated by the magnetic field generating element 3, the direction of the magnetic field acting on each magnetic sensor 20 varies, and each magnetic sensor 20 outputs pulse signals corresponding to the changes in the direction of this magnetic field. The magnetic sensor device 4 detects the magnitude and direction, etc.the rotation of the rotating shaft 100 based on the pulse signals output by each magnetic sensor 20.

[0035] Each yoke 21 is made, for example, of iron or other soft magnetic materials. Each yoke 21 controls the direction of the magnetic flux such that the magnetic flux of the magnetic field, which is generated by the two magnetic poles of the magnetic field generating element 3 at opposite ends in the direction of extension of the magnetic wire rod 30 of the magnetic sensor 20, is focused onto the magnetic wire rod 30. Each yoke 21 causes the magnetic flux to flow in the direction of extension of the magnetic wire rod 30 and additionally ensures that the magnetic flux passes through the magnetic wire rod 30. (Magnetic sensors)

[0036] Fig. Figure 9 is a perspective top view of a single magnetic sensor 20 and Fig. Figure 10 is a perspective bottom view of a single magnetic sensor 20. For the sake of simplicity, the directions associated with the magnetic sensor 20, such as forward (F), backward (B), upward (U), downward (D), left (L), and right (R), are shown as indicated in Fig. 9 and Fig. The magnetic sensor 20 is defined by the arrows shown in the diagram. It comprises a magnetic wire rod 30, a coil body 31, a coil 32 and two terminals 33 (first terminals). Fig. Figure 11 is a perspective top view of a single magnetic sensor 20 with the coil 32 removed, and Fig. Figure 12 is a perspective view of connection 33.

[0037] The magnetic wire rod 30 is a composite magnetic wire that generates the large Barkhausen effect. The magnetic wire rod 30 is a wire rod made, for example, of a semi-rigid magnetic material including iron and cobalt, and has a diameter of approximately 0.1 mm to 1 mm and a length of approximately 10 mm to 30 mm. The magnetic wire rod 30 is formed, for example, by drawing the aforementioned semi-rigid magnetic material and twisting it repeatedly while changing its direction. The magnetic wire rod 30 exhibits uniaxial anisotropy, where the simple magnetization direction is the direction of the central axis of the magnetic wire rod 30. In the magnetic wire rod 30, the coercive force of the central section is greater than the coercive force of the outer circumferential section.The magnetic wire rod 30 has a property in which the magnetization direction of the magnetic wire rod 30 (outer circumferential section) is abruptly reversed in response to changes in the direction of an external magnetic field.

[0038] The coil former 31 is, for example, made of plastic or other non-magnetic materials in a bilaterally symmetrical manner. The coil former 31 comprises a wire winding section 31a and two wire rod support sections 31b. The wire winding section 31a, which is provided in the intermediate section of the coil former 31 in the left-to-right direction, is configured in a column-like shape extending from left to right. The wire rod support sections 31b are provided in the left and right end sections of the coil former 31, respectively, and are specifically designed as extensions of the opposite left and right ends of the wire winding section 31a. A wire rod receiving groove 31c, extending from the left to the right end, is provided in the coil former 31 through the left wire rod support section 31b, the wire winding section 31a, and the right wire rod support section 31b.

[0039] The magnet wire 30 is arranged such that it extends in a straight line from left to right within the coil former 31, and is specifically arranged within the wire rod receiving groove 31c of the wire winding section 31a. The left end section of the magnet wire 30 is supported (secured) in the left end section of the wire rod receiving groove 31c by adhesive or other means, and the right end section of the magnet wire 30 is supported (secured) in the right end section of the wire rod receiving groove 31c in the same manner. Alternatively, a wire rod receiving hole extending from the left to the right end of the coil former 31 can be provided instead of the wire rod receiving groove 31c, and the magnet wire 30 can be arranged within the wire rod receiving hole.

[0040] The coil 32 is provided on the outer circumference of the magnet wire rod 30, which is arranged within the wire rod receiving groove 31c. In particular, the coil 32 is formed by winding an insulated electrical wire, such as enamelled wire, around the wire winding section 31a.

[0041] Each terminal 33 is a compression terminal. It should be noted that compression terminals are sometimes also referred to as "spring terminals". Each terminal 33 is made of electrically conductive materials, for example, metallic materials. Each terminal 33 comprises a base section 33a, an electrical wire connection section 33b, a spring section 33c, and a contact section 33d.

[0042] The base section 33a is formed in the form of a plate extending from front to back. The electrical wire connection section 33b extends rearward from the rear end section of the base section 33a, and an end section of the insulated wire of the coil 32, stripped of its insulating sheath, is connected to it. The electrical wire connection section 33b of one terminal 33 of the two terminals 33 is connected to one end of the insulated electrical wire, and the electrical wire connection section 33b of the other terminal 33 is connected to the other end of the insulated electrical wire.The spring section 33c, which is a flat spring used to displace the contact section 33d in a top-to-bottom direction, is, for example, bent downwards from the front end section of the base section 33a and then bent backwards, extending backwards as it slopes downwards. The contact section 33d is a section that makes contact with a conductor section 15 provided on the top surface of the substrate 2 when the magnetic sensor device 4 is coupled to the substrate 2. The contact section 33d is provided at the rear lower end of the spring section 33c and is, for example, configured to curve upwards from the rear lower end of the spring section 33c.

[0043] The two terminals 33 are each provided in the lower sections of the two wire rod support sections 31b of the coil former 31. Once each terminal 33 is arranged in each wire rod support section 31b, the rear ends of the electrical wire connection sections 33b project rearward from the rear sides of the wire rod support sections 31b. The contact sections 33d are typically arranged to project downward from the undersides of the wire rod support sections 31b, while being pushed upward against the spring force of the spring section 33c and pressed into the wire rod support sections 31b under downward pressure.For example, when the magnetic sensor device 4 is arranged on the substrate 2, the contact sections 33d are pressed against the conductor sections 15 on the substrate 2, whereby the position of the undersides of the contact sections 33d coincides with the position of the undersides of the wire rod support sections 31b, and additionally the contact sections 33d are pressed against the conductor sections 15 by the spring force of the spring section 33c and establish a powerful contact with the conductor sections 15, thereby establishing a reliable electrical connection with the conductor sections 15. (Optical disc and optical sensor)

[0044] The optical disk 5 is arranged so that it rotates with the rotating shaft 100, which rotates relative to the housing 101, and the optical sensor 6 is arranged stationary and does not rotate relative to the housing 101.

[0045] The optical disk 5 is, for example, made of plastic or other non-magnetic materials in a disk-like configuration. The optical disk 5 is attached to the circumferential surface of the rotating shaft 100 below the substrate 2 in an orientation such that its plane is perpendicular to the axis of rotation of the rotating shaft 100. The optical disk 5 faces the substrate 2, with the optical sensor 6, which is provided on the substrate 2, positioned between them. Specifically, the optical disk 5 has, on its upper surface opposite the lower surface of the substrate 2, several reflective sections (not shown) that reflect the light to be detected and several non-reflective sections (not shown) that do not reflect the light to be detected.The multiple reflective sections and the multiple non-reflective sections are arranged in an alternating manner in the circumferential direction of the optical disk 5.

[0046] The optical sensor 6 comprises, for example, a light-emitting diode or other light emitter (not shown) that emits illumination light, and a phototransistor or other light receiver (not shown) that receives light to be detected and performs a photoelectric conversion. The optical sensor 6 is attached and secured to the underside of the substrate 2 in such a way that it emits illumination light onto the top surface of the optical disk 5 and receives light to be detected that is reflected from the top surface of the optical disk 5. (Housing)

[0047] The housing 22 of the magnetic sensor device 4 is described in detail below. The housing 22 is made, for example, of plastic or other non-magnetic materials. As mentioned above, the housing 22, together with several round first adjustment holes 40, which correspond to the coupling holes 13 in the substrate 2 for coupling the housing 22 (magnetic sensor device 4) to the substrate 2 by means of bolts or other coupling elements 14, has a round second adjustment hole 41, which corresponds to the insertion hole 10 in the substrate 2 for inserting the magnetic field generating element 3 and the rotating shaft 100. In the housing 22 of the present embodiment, the second adjustment hole 41 is provided in the central section of the housing 22, and the three first adjustment holes 40 are arranged in the outer circumferential section of the housing 22 at intervals of 120 degrees around the second adjustment hole 41.

[0048] Additionally, the housing 22 has several positioning reference holes 42 on its upper surface, which are used for precise positioning relative to the substrate 2. At least two positioning reference holes 42 can be configured as multiple positioning reference holes 42 around the circumference of the second adjustment hole 41. The multiple positioning reference holes 42 are configured such that several positioning projections 111 of a dedicated positioning device 110, such as the one shown in Fig. Figure 13 illustrated, each of which is introduced therein. It should be noted that there are no restrictions regarding the placement of the multiple positioning reference holes 42.

[0049] In addition to the multiple positioning projections 111, the positioning device 110 has a fitting cylinder 112 that fits the outer shape of the magnetic field generating element 3. The design position relationship between the magnetic sensors 20 and the magnetic field generating element 3 varies depending on the type and individual characteristics of the motor and the magnetic sensor device 4. Since the position relationship between the multiple positioning reference holes 42 and the magnetic field generating element 3 is determined according to the design position relationship between the magnetic sensors 20 and the magnetic field generating element 3, the positioning device 110 is constructed by determining the position relationship between the multiple positioning projections 111 and the fitting cylinder 112 according to the position relationship between the multiple positioning reference holes 42 and the magnetic field generating element 3.

[0050] Once the magnetic field generating element 3 has been positioned within the second adjustment hole 41, the coupling elements 14, which are inserted through the first adjustment holes 40 and the coupling holes 13, are attached to the support posts 102, thereby securing the housing 22 to the substrate 2 and the housing 101. As a result of securing the housing 22 to the substrate 2 and the housing 101, the multiple magnetic sensors 20 are precisely positioned relative to the magnetic field generating element 3, which is located within the second adjustment hole 41.

[0051] Additionally, the housing 22 has an adjustment mechanism designed to adjust the position of the multiple magnetic sensors 20 relative to the magnetic field generating element 3 by adjusting the position of the housing 22 relative to the substrate 2 once the position of the optical sensor 6 relative to the optical disk 5 has been set to the design position and the substrate 2 has been accurately positioned.

[0052] The housing 22, as the adjustment mechanism, has first adjustment holes 40, which are formed with a diameter that is larger by a predetermined adjustment width than that of the coupling elements 14 (coupling holes 13 in the substrate 2). Additionally, the housing 22, as the adjustment mechanism, has a second adjustment hole 41, which is formed with a diameter that is larger by a predetermined adjustment width than that of the insertion hole 10 in the substrate 2.

[0053] In other words, compared to the arrangement where the coupling elements 14, which are inserted through the coupling holes 13, and the first adjustment holes 40 are coaxially aligned, the housing 22 allows position adjustment relative to the substrate 2 in a direction parallel to the plane of the substrate 2 (in a direction perpendicular to the insertion direction of the coupling elements 14) with one degree of freedom defined by the adjustment width of the first adjustment holes 40, which serve as the adjustment mechanism. Here, the housing 22 allows position adjustment relative to the substrate 2 in a direction parallel to the plane of the substrate 2 to maintain a sufficient distance (e.g.,to maintain a predetermined distance (or more) from the magnetic field generating element 3, with one degree of freedom defined by the adjustment width of the second adjustment hole 41, without allowing contact between the magnetic field generating element 3 surrounding the rotating shaft 100 inserted through the insertion hole 10 and the second adjustment hole 41. (Assembly of substrate and magnetic sensor device)

[0054] The method used to mount the substrate 2 and the magnetic sensor device 4 with the housing 101 of the motor to form the rotation detection device 1 is as follows.

[0055] First, electrical and electronic components other than the magnetic sensor device 4 are mounted on the substrate 2; for example, conductor sections 15 are mounted on the top of the substrate 2 and an optical sensor 6 is mounted on the bottom of the substrate 2.

[0056] Next, an optical disk 5 is arranged on the outer circumference of the rotating shaft 100 and the optical disk 5 is attached to the rotating shaft 100.

[0057] Additionally, the substrate 2, on which the other electrical and electronic components besides the magnetic sensor device 4 are mounted, is arranged on the outer circumference of the rotating shaft 100. Here, the substrate 2 is positioned such that the insertion hole 10 in the substrate 2 is aligned coaxially with the rotating shaft 100 and the magnetic field generating element 3. Furthermore, the position of the optical sensor 6 relative to the optical disk 5, which is attached to the rotating shaft 100, is adjusted to the design position, and the substrate 2 is precisely positioned. The substrate 2 is then attached and secured to the housing 101 of the motor by means of the support posts 102.

[0058] Next, the housing 22 of the magnetic sensor device 4, which accommodates the three magnetic sensors 20 and three yokes 21, is arranged and precisely positioned on the top of the substrate 2 at the outer circumference of the rotating shaft 100 and the magnetic field generating element 3. Here, the housing 22 can be arranged such that the first adjustment holes 40 in the housing 22 are aligned with the coupling holes 13 in the substrate 2, and can be pre-positioned by inserting the coupling elements 14, without tightening, through the first adjustment holes 40 in the housing 22 and the coupling holes 13 in the substrate 2.

[0059] The precise positioning of the housing 22 relative to the substrate 2 is carried out, for example, with the aid of a dedicated positioning device 110. The positioning device 110 is configured to have several positioning projections 111 and a fitting cylinder 112 on the underside of a base 113. By moving the positioning device 110 against the housing 22, several positioning projections 111 are inserted through the several positioning reference holes 42 in the housing 22, and the fitting cylinder 112 is fitted over the outer shape of the magnetic field generating element 3. This positions the housing 22, i.e., the magnetic sensor device 4, relative to the substrate 2 with such precision that the several magnetic sensors 20 housed in the housing 22 and the magnetic field generating element 3 are arranged in the predetermined design positional relationship.

[0060] Once the magnetic sensor device 4 has been precisely positioned on the substrate 2, each terminal 33 of each magnetic sensor 20 makes contact with a conductor section 15 mounted on the top of the substrate 2. At this point, as a form of the adjustment mechanism described above, the conductor sections 15 have a contact area larger than that of the terminals 33, and therefore contact with the terminals 33 can be maintained even when the housing 22 is adjusted in the horizontal direction during positioning.Additionally, when the terminals 33 make contact with the conductor sections 15, the contact sections 33d are pressed through the conductor sections 15, the spring sections 33c undergo elastic deformation and the contact sections 33d are moved upwards, causing the contact sections 33d to press forcefully against the conductor sections 15 and reliably electrically connect the contact sections 33d to the conductor sections 15.

[0061] Once the housing 22 has been precisely positioned, the coupling elements 14, which are inserted through the first adjustment holes 40 in the housing 22 and the coupling holes 13 in the substrate 2, are tightened and attached to the housing 101 of the motor.

[0062] In this way, once the precise positioning of the optical disk 5, which is attached to the rotating shaft 100, and the optical sensor 6, which is attached to the substrate 2, has been carried out, the housing 22 of the magnetic sensor device 4 can be precisely positioned relative to the substrate 2 and the multiple magnetic sensors 20 can be precisely positioned relative to the magnetic field generating element 3 without affecting the positional relationship between the optical disk 5 and the optical sensor 6.

[0063] As a result of attaching the housing 22 to the substrate 2, the magnetic field generating element 3 is positioned within the second adjustment hole 41 of the housing 22 in a manner that is free of contact with the housing 22. The three magnetic sensors 20 and three yokes 21 are arranged on the outer circumference of the magnetic field generating element 3, while maintaining the predetermined positional relationship. For example, the three magnetic sensors 20 are arranged on the outer circumference of the magnetic field generating element 3 at intervals of 120 degrees in the direction of rotation of the magnetic field generating element 3. Additionally, each magnetic sensor 20 is positioned such that the direction of extension of the magnetic wire rod 30 is parallel to the top surface of the substrate 2.Furthermore, when the substrate 2 is viewed from above, each magnetic sensor 20 is arranged such that the central section of the magnetic wire rod 30 is tangential in the direction of extension (strictly speaking, the central section of the central axis of the magnetic wire rod 30 in the direction of extension) to a predefined circle that is coaxial with the second adjustment hole 41 on the outer circumference of the magnetic field generating element 3. Additionally, the three yokes 21 are also arranged at intervals of 120 degrees in the direction of rotation of the magnetic field generating element 3, with each yoke 21 being positioned adjacent to a magnetic sensor 20 on the inner circumference of the magnetic sensor 20.

[0064] In this way, the predetermined positional relationship of the magnetic field generating element 3, the three magnetic sensors 20 and the three yokes 21, which are used to detect the rotation of the rotating shaft 100, is established in one step without affecting the positional relationship between the optical disk 5 and the optical sensor 6, simply by attaching the housing 22 to the substrate 2.

[0065] As mentioned above, according to the present embodiment, a rotation detection device 1, which detects the rotation of a rotating shaft 100 (rotating body), comprises a single substrate 2 with an insertion hole 10 into which the rotating shaft 100 is inserted, a magnetic field generating element 3 which rotates with the rotation of the rotating shaft 100, several magnetic sensors 20 which are arranged around the circumference of the magnetic field generating element 3, a housing 22 which accommodates the several magnetic sensors 20 and is provided on the substrate 2, an optical sensor 6 which is provided on the substrate 2 on the side facing away from the several magnetic sensors 20, and an optical disk 5 which is arranged facing the substrate 2, with the optical sensor 6 positioned between it and the substrate 2, and which rotates with the rotating shaft 100.The rotation detection device 1 has an adjustment mechanism that is able to adjust the position of the multiple magnetic sensors 20 relative to the magnetic field generating element 3 by adjusting the position of the housing 22 relative to the substrate 2, once the position of the optical sensor 6 relative to the optical disk 5 has been adjusted and the substrate 2 has been accurately positioned.

[0066] For this reason, the rotation detection device 1 allows the design position relationship between the magnetic field generating element 3 and the magnetic sensors 20, which are used to detect the rotation of the rotating shaft 100, to be easily set, and allows the magnetic sensors 20 to be attached without affecting the position relationship between the optical disk 5 and the optical sensor 6, simply by attaching the housing 22 to the substrate 2 on which the optical sensor 6 is provided.

[0067] In particular, according to the present embodiment of the rotation detection device 1, the device comprises coupling elements 14 that couple the housing 22 and the substrate 2. The substrate 2 has coupling holes 13 through which the coupling elements 14 are inserted, and the housing 22 has, as an adjustment mechanism, first adjustment holes 40, which are formed with a diameter that is larger by a predetermined adjustment width than that of the coupling elements 14, and through which the coupling elements 14 are inserted. For this reason, the housing 22 can be adjusted by moving it relative to the substrate 2 in a direction perpendicular to the insertion direction of the coupling elements 14 (in a direction parallel to the plane of the substrate 2) without affecting the positional relationship between the optical disk 5 and the optical sensor 6.In this case, in comparison, if the coupling elements 14, which are inserted through the coupling holes 13, and the first adjustment holes 40 are coaxially aligned, it becomes possible to adjust the position of the housing 22 relative to the substrate 2 with one degree of freedom defined by the adjustment width of the first adjustment holes 40. Accordingly, it is possible to adjust the position of the magnetic sensors 20, which are housed in the housing 22, relative to the magnetic field generating element 3.

[0068] Furthermore, according to the present embodiment of the rotation detection device 1, the housing 22 has a second adjustment hole 41 as an adjustment mechanism. This hole has a diameter that is larger than the insertion hole 10 by a predetermined adjustment width, and the rotating shaft 100 and the magnetic field generating element 3 are inserted into this second adjustment hole. This allows the housing 22 to be adjusted by moving it relative to the substrate 2 in a direction perpendicular to the axis of rotation of the rotating shaft 100 (in a direction parallel to the plane of the substrate 2) without affecting the positional relationship between the optical disk 5 and the optical sensor 6, in such a way as to achieve a sufficient distance (e.g.,to maintain a predetermined distance (or more) from the magnetic field generating element 3, with one degree of freedom defined by the adjustment width of the second adjustment hole 41, without allowing contact between the magnetic field generating element 3 and the second adjustment hole 41.

[0069] Furthermore, according to the present embodiment of the rotation detection device 1, the magnetic sensors 20 and the substrate 2 each comprise terminals 33 (first terminals) and conductor sections 15 (second terminals) that are in mutual contact. As an adjustment mechanism, the terminals 33 are designed as compression terminals, while the conductor sections 15 have a contact area that is larger than that of the compression terminals by a predetermined adjustment width. This allows the terminals 33 and the conductor sections 15 to be kept in contact, and the electrical connection between the terminals 33 and the conductor sections 15 can be maintained even when the housing 22 is adjusted by moving it relative to the substrate 2 in a direction parallel to the plane of the substrate 2.

[0070] Furthermore, soldering, such as reflow soldering, is not required to connect the terminals 33 to the conductor sections 15. Since each magnetic sensor 20 is attached to the substrate 2 due to the fact that the housing 22 is coupled to the substrate 2 by the coupling elements 14, no additional soldering is required to attach the housing 22 and each magnetic sensor 20 to the substrate 2. Accordingly, in the present embodiment, when mounting the substrate 2, on which the magnetic sensor device 4 has not yet been mounted, the magnetic sensor device 4 can be mounted to the substrate 2 using the motor housing 101. Once the magnetic sensor device 4 is mounted to the substrate 2, the magnetic sensors 20 can be precisely positioned relative to the magnetic field generating element 3. Furthermore, in the present embodiment, the magnetic sensors 20 are not exposed to any heat generated by soldering.In addition, according to the present embodiment, no deviations from the design position of the housing 22 relative to the substrate 2 or from the design position of the magnetic sensors 20 relative to the magnetic field generating element 3 occur due to the soldering.

[0071] Furthermore, because, according to the present embodiment, the magnetic sensors 20 are precisely positioned relative to the magnetic field generating element 3, and the magnetic sensor device 4 is mounted on the substrate 2 after the substrate 2 has been mounted to the motor housing 101, even if the substrate 2 is misaligned from its design position relative to the motor housing 101 when the substrate 2 is mounted to the housing 101, the misalignment of the substrate 2 relative to the housing 101 can be absorbed by adjusting the position of the magnetic sensors 20 relative to the magnetic field generating element 3 when the magnetic sensor device 4 is mounted on the substrate 2. In other words, even if the substrate 2 is not aligned with respect to the housing 101, the magnetic sensor device 4 can be arranged such that the position of the magnetic sensors 20 relative to the magnetic field generating element 3 corresponds to the design position.

[0072] In addition, according to the present embodiment, even after coupling the magnetic sensor device 4 to the substrate 2, the position of the magnetic sensor device 4 can be adjusted without affecting the positional relationship between the optical disk 5 and the optical sensor 6 by loosening or removing the coupling elements 14, and in addition, the magnetic sensor device 4 can be detached from the motor and reattached to the motor without detaching the substrate 2 from the housing 101.

[0073] Furthermore, in the present embodiment, the three magnetic sensors 20 are housed in the casing 22 and are arranged and mounted at predetermined locations within the casing 22. These sensors are used to detect the rotation of the rotating shaft 100. Specifically, within the casing 22, the three magnetic sensors 20 are arranged in a reference plane that is coplanar with the underside of the casing 22 and positioned circumferentially at 120-degree intervals around the second adjustment hole 41, such that the direction of extension of the magnetic wire rods 30 is parallel to the reference plane. Therefore, the predetermined design position relationship of the magnetic field generating element 3 and the three magnetic sensors 20, which are used to detect the rotation of the rotating shaft 100, can be determined in a single step and with high precision simply by mounting the casing 22 to the substrate 2.This makes it possible to mount the three magnetic sensors 20 on the substrate 2 with greater ease and precision than, for example, by determining the position of the magnetic sensors 20 relative to the magnetic field generating element 3 on an individual basis for each magnetic sensor 20.

[0074] Furthermore, in the present embodiment, in addition to the three magnetic sensors 20, three yokes 21 are housed in the casing 22, and within the casing 22 the three magnetic sensors 20 and three yokes 21 are arranged and attached at predetermined positions, which are used to detect the rotation of the rotating shaft 100. Therefore, the predetermined design position relationship of the magnetic field generating element 3, the three magnetic sensors 20, and the three yokes 21, which are used to detect the rotation of the rotating shaft 100, can be determined in one step and with high precision, simply by mounting the casing 22 on the substrate 2.

[0075] It should be noted that, while the above embodiment describes an example in which the three magnetic sensors 20 are arranged at intervals of 120 degrees within the housing 22 of the magnetic sensor device 4, and the three yokes 21 are also arranged at intervals of 120 degrees, the placement of the three magnetic sensors 20 and the placement of the three yokes 21 in the present invention is not limited to this example. For example, within the housing 22 of the magnetic sensor device 4, the three magnetic sensors 20 can be arranged at predetermined angular intervals of less than 120 degrees (for example, 60 degrees), and the three yokes 21 can also be arranged at the same angular intervals.

[0076] While the embodiment described above represents an example in which the three magnetic sensors 20 are arranged in the housing 22 such that, when the substrate 2 is viewed from above, the central sections of the magnetic wire rods 30 are tangential in the direction of extension to a predefined circle that is coaxial with the second adjustment hole 41 on the outer circumference of the magnetic field-generating element 3, the present invention is not limited to this example. For instance, the three magnetic sensors 20 can be arranged such that each magnetic wire rod 30 is transverse to the circumference of the predefined circle. It should be noted that in such a placement, the placement of the magnetic field-generating element 3 (the magnetic poles or magnets used to form a rotating magnetic field) within the rotation detection device 1 will also be different.Regarding the placement of the magnetic field generating element 3, Japanese patent application publication no. 2019-200098 should be useful as a reference. Alternatively, other implementations for the placement of the multiple magnetic sensors 20 can be assumed.

[0077] While the above embodiment describes an example in which the reference plane in which the three magnetic sensors 20 are arranged is coplanar with the underside of the housing 22, the present invention is not limited to this example. As long as it is parallel to the underside of the housing 22, for example, the reference plane can be a plane arranged above or below the underside of the housing 22. In such a case, the vertical position of the three magnetic sensors 20 or the vertical position of the contact section 33d of each terminal 33, etc., is adjusted such that the stability of the mounting of the magnetic sensor device 4 on the substrate 2 and the contact between each terminal 33 and the conductor sections 15 are ensured.

[0078] Additionally, in the present invention, the number of magnetic sensors 20 provided in the housing 22 of the magnetic sensor device 4 is not limited to three and can also be one, two, four, or more. The same applies to the yokes 21. Alternatively, in the present invention, the magnetic sensor device 4 can be configured without providing yokes 21 within the housing 22.

[0079] While the above embodiment describes an example in which bolts and other coupling elements 14 are attached to the support posts 102 of the housing 101 for coupling the housing 22 and the substrate 2, the present invention is not limited to this example, and the coupling elements 14 can couple the housing 22 and the substrate 2 by tightening them to nuts and the like on the underside of the substrate 2. Furthermore, the coupling elements 14 used to couple the housing 22 to the substrate 2 are not limited to bolts and can be, for example, rivets, clamps, and the like. Additionally, the present invention can be used for purposes other than detecting the rotation of a rotating shaft 100.

[0080] It should be noted that, while the above embodiment describes an example in which the conductor sections 15 are configured with a contact area that is larger by a predetermined adjustment width than that of the terminals 33 provided in the magnetic sensors 20, the present invention is not limited to this example. For example, the terminals 33 provided in the magnetic sensors 20 can be configured with a contact area that is larger by a predetermined adjustment width than that of the conductor sections 15.

[0081] Additionally, while the above embodiment describes an example in which the magnetic sensors 20 comprise terminals 33 with a single contact section 33d, the present invention is not limited to this example. For example, instead of terminals 33 with a single contact section 33d, the magnetic sensors 20 may comprise terminals 34 with multiple contact sections 34d, in particular as shown in Fig. Figure 14 shows terminals 34, which are configured as compression terminals with two contact sections 34d. The terminals 34 comprise a base section 34a, an electrical wire connection section 34b, two spring sections 34c and two contact sections 34d.

[0082] The base section 34a is configured as a plate extending from front to back. The electrical wire connection section 34b extends rearward from the rear end section of the base section 34a, and an end section of the insulated wire of the coil 32, stripped of its insulating sheath, is connected to it. Each spring section 34c, which is a flat spring used to displace a contact section 34d in a top-to-bottom direction, is bent downward from the front end of the base section 34a and then bent rearward, after which it extends rearward as it slopes downward. Of the two spring sections 34c, one extends from the left front end of the base section 34a, and the other extends from the right front end of the base section 34a.The contact sections 34d are sections that make contact with conductor sections 15 provided on the top surface of the substrate 2 when the magnetic sensor device 4 is coupled to the substrate 2. Each contact section 34d is provided at the rear lower end of a spring section 34c and is configured, for example, to curve upwards from the rear lower end of the spring section 34c.

[0083] The terminals 34, comprising two spring sections 34c and two contact sections 34d, are designed to allow the two contact sections 34d to make contact with a single conductor section 15 provided on the substrate 2. In other words, the terminals 34 have two contact points, each intended for a single conductor section 15. Furthermore, the two spring sections 34c are capable of elastic deformation independently of one another, and therefore the two contact sections 34d are capable of moving independently in a top-to-bottom direction. The terminals 34 configured in this way can increase the reliability of the contact with the conductor sections 15.

[0084] Additionally, while the above embodiment describes an example in which the magnetic sensors 20 comprise terminals 33 or terminals 34 that are compression terminals, and the substrate 2 comprises pads and other conductor sections 15 that are placed in contact with the terminals 33 or the terminals 34, the present invention is not limited to this example. For example, the substrate 2 can be adapted to comprise compression terminals, and the magnetic sensors 20 can be adapted to comprise pads or other conductors.

[0085] Furthermore, while the above embodiment describes an example in which the first adjustment holes 40 provided in the housing 22 of the magnetic sensor device 4 are formed with a diameter that is larger than that of the coupling elements 14 by a predetermined adjustment width, such that the housing 22 is adjustable in all horizontal directions with respect to the substrate 2, the present invention is not limited to this example. For instance, the first adjustment holes 40 can be configured to extend circumferentially around the second adjustment hole 41, so that the housing 22 can only be adjusted circumferentially with respect to the substrate 2.

[0086] In addition, suitable modifications can be made to the present invention without deviating from the core or concept of the invention, which can be read from the claims and the description as a whole, and rotation detection devices associated with such modifications are also included in the technical concept of the present invention. [Description of reference symbols] 1 Rotation detection device 2 Substrat 3 Magnetic field generating element 4 Magnetic sensor device 5 Optical disc 6 Optical Sensor 10 insertion holes 11 Mounting holes 12 Fastening element 13 coupling holes 14 Coupling element 15 ladder section 20 magnetic sensor 21 yoke 22 cases 30 magnetic wire rods 31 coil formers 32 coil 33, 34 connections 40 first adjustment hole 41 second adjustment hole 42 Positioning reference hole 100 Rotary shaft 101 cases QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2024-218373

[0001] JP 2019-200098

[0076]

Claims

A rotation detection device, comprising: a single substrate with an insertion hole into which the rotating body is inserted; a magnetic field generating element that rotates with the rotation of the rotating body; a plurality of magnetic sensors arranged around the magnetic field generating element; a housing that accommodates the plurality of magnetic sensors and is provided on the substrate; and an optical sensor provided on the substrate on the side facing away from the plurality of magnetic sensors.and an optical disk which is arranged facing the substrate, wherein the optical sensor is arranged between them, and which rotates with the rotation of the rotating body, wherein the device has an adjustment mechanism which is able to adjust the position of the plurality of magnetic sensors in relation to the magnetic field generating element by adjusting the position of the housing relative to the substrate, once the position of the optical sensor relative to the optical disk has been set and the substrate has been accurately positioned. Rotation detection device according to claim 1, comprising coupling elements that couple the housing and the substrate, wherein the substrate has coupling holes through which the coupling elements are inserted, and the housing has, as the adjustment mechanism, first adjustment holes formed with a diameter that is larger than the coupling elements by a predetermined adjustment width, and through which the coupling elements are inserted. Rotation detection device according to claim 2, wherein the housing has a second adjustment hole as the adjustment mechanism, which is formed with a diameter that is larger than that of the insertion hole by a predetermined adjustment width, and into which the rotating body and the magnetic field generating element are inserted. Rotation detection device according to claim 2, wherein the magnetic sensors and the substrate each comprise first terminals and second terminals which are placed in mutual contact, and one of the first terminals or the second terminals is configured as a compression terminal as the adjustment mechanism, and another of the first terminals or the second terminals is configured as a conductor section whose contact area is larger than the compression terminal by a predetermined adjustment width.

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