JP2005274198A - Magnetic encoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic encoder capable of reducing both the number of parts and costs by enabling a connector to be mounted on a substrate in either a vertical or horizontal drawing direction. <P>SOLUTION: The magnetic encoder includes a motor; a case; a cap; a magnetic drum pivoted at a rotating shaft of the motor and polarized in such a way that magnetic poles are alternately changed along a circumference; and a substrate provided with a magnetic detection element arranged at a location opposed to a polarized surface of the magnetic drum, detects changes in magnetic field strength with the rotation of the magnetic drum by the magnetic detection element, and is provided with the connector for outputting its detection signals to the outside. The cap includes a recession part so that the connector mounted to the substrate may be protruded in either a vertical or horizontal drawing direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a magnetic encoder, and more particularly to a magnetic encoder in which a connector terminal attached to a board can protrude in either direction (vertical protruding direction or horizontal protruding direction).

In general, an encoder (rotational position detection device) is a position sensor that detects a rotational angle, and is provided with an optical encoder that optically detects the rotational angle and a magnetic encoder that magnetically detects the rotational angle. ing. The optical encoder has an advantage that high resolution can be obtained relatively easily. However, the high-resolution optical encoder has a problem that an error occurs because a signal is not detected when dust or oil adheres because the slit width carved into the rotating body is narrow.

On the other hand, the magnetic encoder is a method in which a magnetic flux generated from a magnetic drum on which a predetermined magnetization pattern (A phase and B phase is magnetized) is detected by a sensor such as a magnetic detection element (for example, MR element). Compared to optical encoders, it has the advantage of being less susceptible to dust and oil adhesion, and the magnetic encoder has fewer parts, has a simple structure, and has excellent high-speed response. Due to its advantages, it has been used for various purposes these days.

The magnetic encoder is provided with a magnetized surface in which a predetermined number of different magnetic poles are alternately magnetized on the surface of the magnetic drum. The magnetic drum is fixed to the rotating shaft of the motor, and is rotated with the rotation of the rotating shaft. In the vicinity of the rotating drum, a magnetic detecting element (hereinafter referred to as an MR element) is disposed on the substrate so as to face the magnetic film.

When the magnetic drum rotates in accordance with the rotation of the rotating shaft, the magnetic encoder configured as described above outputs an electrical signal from the MR element provided on the substrate according to the magnetic field strength of the magnetic drum, and the waveform processing circuit shapes the waveform. And output from the connector to the outside. It is widely used as an application for detecting the exact position (movement amount) of a straight line and a rotating body in a machine tool, industrial robot, etc. using the magnetic encoder described above.

As described above, a connector (connection terminal) formed of synthetic resin or the like needs to be attached to a substrate in order to output to the magnetic encoder. In addition to encoders, for example, the following documents are disclosed as techniques for mounting a connector on a board in general. In this document, a connector is inserted from a side (horizontal posture) into a notch provided in a substrate.
JP 2002-343469 A JP 2002-367698 A

However, since the magnetic encoder is employed in various applications as described above, there are many requests for the mounting position and orientation, and each of the type for the vertical orientation from the substrate or the type for the lateral orientation from the substrate ( Two types) were prepared, attached to each substrate, and each time a response was made. For this reason, the number of parts is increased, resulting in an increase in cost.

  The present invention provides a magnetic encoder capable of reducing the number of parts and reducing the cost by allowing the connector to be attached to the board in either the vertical or horizontal direction. For the purpose.

The configuration of the present invention includes a motor, a case, a cap, a magnetic drum that is pivotally supported by the rotation shaft of the motor and is magnetized so that magnetic poles change alternately along the circumference, and the magnetic drum is magnetized. And a substrate provided with a magnetic detection element disposed at a position opposite to the surface, and a connector for detecting a change in magnetic field intensity accompanying the rotation of the magnetic drum with the magnetic detection element and outputting the detection signal to the outside. In magnetic encoder,
This is achieved by providing the case or cap with a recess for projecting the connector attached to the board in either the vertical or horizontal direction.

  According to the configuration of the present invention, it is possible to project the connector from the recess provided in the case or the cap in either the vertical projection direction or the horizontal projection direction. Since it is assembled as a common part without preparing each (two kinds) type of substrates, the effect leading to cost reduction is remarkable.

DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a magnetic encoder of the present invention will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional view showing the configuration of a magnetic encoder connected to a motor, and FIG. 2 is an exploded cross-sectional view of the internal configuration of the magnetic encoder of the present invention. It protrudes. FIG. 3 is an exploded cross-sectional view of the internal configuration of the magnetic encoder of the present invention, and the connector protrudes from the board in the lateral direction.

First, the configuration of the magnetic encoder of the present invention will be described. A motor (for example, a coreless motor) is connected in front of the magnetic encoder, and a speed reducer (for example, a planetary gear transmission device) is connected to the front side of the motor (not shown).
The description of the configuration of the coreless motor and the description of the configuration of the planetary gear type transmission device employ a general technique, and thus the description thereof is omitted here. By connecting the motor, the planetary gear type transmission device, and the magnetic encoder here, an integrated configuration is obtained. Each is formed into a small size of a cylindrical shape (diameter 16 mm, diameter 22 mm).

The magnetic encoder 10 is supported in the case 11 by the rotary shaft 5a of the motor 5 described above, and is magnetized so that the magnetic poles are alternately changed along the periphery. The structure is such that a substrate 13 provided with a magnetic detection element 14 disposed at a position facing the magnetic surface is internally provided and attached by a cap 16. The board 13 is provided with a vertical connector A and a horizontal connector B for outputting detection signals to the outside.
The magnetic encoder 10 of the present invention is further provided with the following new configuration. That is, the cap 16 has a recessed portion 16a that is recessed so that the vertical connector 15A and the horizontal connector 15B attached to the substrate 13 can protrude in either the vertical direction or the horizontal direction. The point provided is the gist.

The motor 5 has a pinion gear 5b that conducts to the speed reducer at the tip and is supported by the shaft, and a rotating shaft 5a is provided at the rear end.
In the case 11 of the magnetic encoder 10, an opening step portion 11 a is formed, and a receiving portion 11 b is formed at an edge, and a protruding portion 16 b of a cap 16 described later is attached to the receiving portion 11 b and bonded thereto. Can be assembled.
The rotary shaft 5a is pivotally supported in the shaft hole 12a of the circular magnetic drum 12, and is rotatable. Further, the magnetic drum 12 is magnetized so as to become a magnetic pole along the periphery (for example, the inner periphery or the outer periphery). Further, a substrate 13 provided with a magnetic detection element 14 (for example, an MR element or a magnetic sensor) is incorporated so as to face the magnetized surface of the magnetic drum 12.
A connector 15 for outputting detection signals to the outside is attached to the back surface of the substrate 13 (such as soldering pins). There are two types of connectors 15, including a vertical connector 15A and a horizontal connector 15B. The magnetic encoder 10 is used depending on the application, mounting position, location, and the like.

FIG. 2 shows a state in which the vertical connector 15A is soldered to the board 13, and FIG. 3 shows a state in which the horizontal connector 15B is soldered to the board 13. That is, the direction of the connector 15 is different. The vertical connector 15A is in contact with the short side 15a on one side of the board 13, and the horizontal connector 15B is in contact with the long side 15b of one side on the board 13.
When the vertical connector 15A and the horizontal connector 15B having different orientations are attached to the substrate 13 as described above, two types of caps 16 are required. However, by providing the cap 16 with the concave recess 16a of the present invention. , Commonization (common parts) can be achieved.

The cap 16 has a cylindrical shape, has a protruding protrusion 16b formed at the tip, and has a recess 16a that is recessed at a part of the periphery. The recess 16a is recessed to have a width and a depth that allow the vertical connector 15A and the horizontal connector 15B to enter. The thickness of the protrusion 16b at the tip is for fitting into the receiving portion 11b of the case 11.
Therefore, even in the case of the vertical connector 15A attached to the substrate 13, it can protrude from the recess 16a of the cap 16 (see FIG. 4). FIG. 4 shows a state before and after the vertical connector 15A enters the recess 16a.
Further, even in the case of the lateral connector 15B attached to the substrate 13, it can protrude from the recess 16a of the cap 16 (see FIG. 5). FIG. 5 also shows the state before the lateral connector 15B enters the recess 16a and the state after it enters.

With the configuration described above, the connector 15 can protrude from the recess 16a provided in the cap 16 in either the vertical or horizontal direction, so that it can be easily mounted on the board 13, Even if each (two types) of substrates 13 and caps 16 are not prepared, they are assembled as common parts, leading to cost reduction. Further, after assembly, the connector 15 serves as a case, thereby preventing entry of dust and the like.

Next, another embodiment in which a recess is provided on the case side will be described.
The configuration of the magnetic encoder described above has been described as a separate part so as to be attached to the case 11 by providing the concave part 16a on the cap 16 side. However, the concave part 16a is formed at the end of the case 11 itself. The point which is provided in case 11 is also a summary.
As shown in FIG. 6, the recess 16 a provided in the case 11 is also recessed to have a width and a depth that allow the vertical connector 15 </ b> A and the horizontal connector 15 </ b> B to enter. Therefore, here, the connector 15 can be protruded from the recess 16a provided at the end portion of the case 11 in either the longitudinally projecting direction or the laterally projecting direction, so that no cap component is required. FIG. 6 is a view in which a horizontal connector 15B is attached to the substrate 13. FIG.

It is a partial cross section figure which shows the structure of the magnetic encoder connected to the motor. It is sectional drawing which decomposed | disassembled the internal structure of the magnetic encoder of this invention, and is a state figure which the connector protrudes from the board | substrate in the vertical protrusion direction. It is sectional drawing which decomposed | disassembled the internal structure of the magnetic encoder of this invention, and is a state figure which the connector protrudes in the horizontal direction from a board | substrate. It shows the state before and after the connector for vertical extension enters the recess of the cap. It shows the state before and after the connector for lateral extension enters the recess of the cap. It is a figure which shows other embodiment which provided the recessed part in the case side.

Explanation of symbols

5 Motor 10 Magnetic encoder 11 Case 12 Magnetic drum 13 Substrate 14 Magnetic detection element 15A Vertical connector 15B Horizontal connector 16 Cap 16a Recess

Claims (1)

A motor, a case, a cap, a magnetic drum that is pivotally supported by the rotation shaft of the motor, and is magnetized so that the magnetic poles are alternately changed along the circumference, and a position facing the magnetized surface of the magnetic drum A magnetic encoder including a connector provided with a substrate provided with a magnetic detection element disposed, detecting a change in magnetic field strength associated with rotation of the magnetic drum with the magnetic detection element, and outputting the detection signal to the outside;
A magnetic encoder in which a concave portion is provided in the case or the cap for the connector attached to the substrate to protrude in either the longitudinal direction or the lateral direction.

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