JPS6354782A - Noncontact type potentiometer - Google Patents

Abstract

PURPOSE:To reduce a radial size by providing ferromagnetic magnetic resistance elements disposed in parallel with the rotational shaft center of a rotor in a planar direction annularly as a whole, a yoke of U-shaped sectional magnetic material formed at an extension for interposing the elements at both ends as integrally rotated with the rotor, and magnetic field generating means. CONSTITUTION:A rotatable rotor 8 provided in a housing 10, and an insulating substrate 1 having ferromagnetic magnetic resistance elements 2a, 2b disposed in parallel with the rotational shaft center direction of the rotor 8 on a flat surface annularly as a whole and disposed at a predetermined interval from the rotor 8 substantially concentrically with the rotor 8 are provided. Further, a yoke 13 of U-shaped sectional magnetic material formed with extensions 13a, 13b for interposing the elements 2a, 2b at both ends, mounted to integrally rotate with the rotor 8, and magnetic field generating means 6 for forming a closed magnetic path with the elements 2a, 2b provided to have lines of mag netic force along the direction of the rotational shaft of the rotor 8 at the extension 13a of the yoke 13 are provided. Said means 6 is, for example, a semicircular permanent magnet.

Description

Detailed Description of the Invention: Clrl Industrial Field 1 This invention relates to a 31 contact type potentiometer that rotates a rotor, and particularly to a non-contact type potentiometer that uses a strong magnetoresistive element in which the resistance value is reduced by magnetic force. Concerning potentiometers.

[Prior art] The magnetic circuit of a non-contact 3-way magnetic circuit has traditionally been constructed as (11 circuits) using a bottomed cylindrical core, a rotating 1/1 month holiday, and a permanent magnet. , rotation (fl) Rn of 1nSn, which has a low magnetic resistance, is placed in the gap formed at the tip of the rotating magnetic body to generate an output corresponding to the rotation of the rotating magnetic body. By changing the size of the gap formed in the part, in other words, by processing the tip of the rotating magnetic body into a predetermined shape, the l
The predetermined function output from the magnetoresistive element made of NSB is 19.

[Problem to be solved by the invention] In this case, in the previously proposed Japanese Patent Application No. 61-722C1I, the lines of magnetic force of the permanent magnets are arranged so as to be parallel to the plane of the rotor. This increases the size in the radial direction, and there is a problem in increasing the size in this direction.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a non-contact potentiometer that has the extraordinary effect of preventing the rotor from increasing in size in the radial direction and reducing the size in the radial direction. With the goal.

[Means for Solving the Problems] The present invention includes a housing, a rotor rotatably provided within the housing, and a rotor that is substantially concentric with the yoke and is spaced a predetermined distance from the yoke. an insulating substrate having a ferromagnetic magnetoresistive element arranged in an annular shape as a whole and whose plane direction is parallel to the y-direction of the rotational axis of the rotor; and an insulating substrate mounted so as to rotate integrally with the rotor. A yoke made of a magnetic material and having a cross-section shaped like an opening is formed with an extension portion sandwiching the ferromagnetic magnetoresistive element of the plate at both ends thereof; The magnetic field generating means is provided with magnetic force lines along the axial direction and forms a closed path with the ferromagnetic magnetoresistive element.

[Function] According to the present invention configured as described above, the dimensions of the mouth and the mouth are reduced in the radial direction, and as a result, the size can be reduced in that direction.

[Effects of the Invention] According to the present invention configured as described above, the bobbinometer 15I having an elongated shape in the direction of the rotational axis of the rotor 15I is advantageous in that it can be installed even in a narrow place.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure shows one embodiment of the present invention, and figure (a) shows its top view, and figure (b) shows the Δ-AI cross-sectional view in figure (a).The configuration at J3 in the figure is a circuit. On an insulating substrate 1 as a substrate, a circular or polygonal shape having an opening,
Ferromagnetic magnetoresistive elements 2a and 2b made of thin films such as Ni-Fe and Ni-GO are formed, one terminal 3 of the opening is connected to the power supply voltage VCC, and the other terminal 4 is grounded (GND). )are doing. (forming a so-called half bridge). In addition, ferromagnetic magnetoresistive elements 2a, 2b
The output terminal 5 is taken out from inside and connected to the output yout. And ferromagnetic 1.41 Ω resistance elements 2a, 2b
Semicircular arc-shaped permanent magnets 6 are attached to the ferromagnetic resistance elements 2a and 2b side of the insulating substrate 1 at a predetermined interval.

To describe this state or mode in more detail, a disc-shaped rotor 8 is disposed inside the cylindrical housing 7 with a closed top end, and the rotation axis 9 of the rotor 8 is oriented in the vertical direction. It passes through the upper surface and is supported by a bearing 10. A case 11 is provided in a closed state at the lower end opening of the housing 7, and a stepped cylindrical stationary member 12 is integrally formed on the upper surface of the housing 7 so as to be concentric with the rotating shaft. An insulating substrate 1 of -nJ flexibility is attached to the outer peripheral edge of the large diameter portion 12a. Reference numeral 13 is a U-shaped rib made of a magnetic material, which is disposed within the housing 7 and attached to the lower surface of the rib 8. Exit part 13a,
13b are positioned to sandwich the large diameter portion 12a of the stationary member 12 from the 19-view direction. A permanent magnet 6 as a magnetic field generating means is attached to the lower surface of the extension 13a of the yaw wheel 13 with adhesive, and the direction of the magnetic field lines is set as shown in FIG.
) is oriented in the axial direction of the rotating shaft 9 and the stationary member 12 as shown by M. Then, the extending portion 13 of the yoke 13
A, 13b and the ferromagnetic magnetoresistive element 2a form a closed magnetic path of one permanent material 6.

Further, the permanent magnet 6 is made up of strong ++a tn resistive elements 2a, 2.
Make the center of b the center of the rotation axis and strengthen! a+! The permanent magnet 6 rotates in the circumferential direction of the ferromagnetic magnetoresistive element 2a, and the absolute value of the strength 1 of the magnetic field generated by the permanent magnet 6 toward the ferromagnetic magnetoresistive element 2a is strong 1. N-type resistance element 2a12
In practical terms, it is set to be equal to or higher than the saturation magnetic field bullet hole of b. Further, the magnetic field is applied in a direction perpendicular to the circumferential direction of the @i magnetic magnetoresistive element 2a, that is, in a radial direction.

Next, the operation of the blank meter configured as described above will be explained.

When the ferromagnetic magnetoresistive elements 2a and 2b receive a magnetic field from the permanent magnet 6 in a direction perpendicular to the current direction, their resistance values decrease. And the permanent magnet 6 is the ferromagnetic magnetoresistive element 2
By rotating in the circumferential direction of the ferromagnetic magnetoresistive cables 2a and 2b, the resistance decreasing portions in the ferromagnetic magnetoresistive cables 2a and 2b also rotate continuously. Therefore, the output Vou as a divided voltage value of the power supply voltage Vcc is determined by the ratio of the resistance (direct) between the grounding terminal 4 and the output terminal 5 and the resistance value between the output terminal 5 and the terminal 3 of the power supply voltage VCC. The rotation angle t has linearity as shown in Figure 2.In Figure 2, the rotation angle is 0.
The degree is that the straight side 6a of the permanent magnet 6 in FIG. 1 is perpendicular to B-BFi in the figure, and the permanent magnet 6 is placed on the left side in the figure. Further, although FIG. 2 shows the characteristic of clockwise rotation from that position in FIG. 1, the rotation direction may be either direction. , and the strong tacity (
・As shown in the graph of Fig. 3 (solid line), when the n-air resistance elements 2a and 2b are subjected to a magnetic field strength (absolute value) greater than the saturation magnetic field (-dotted chain line), the decrease in resistance value is constant. (resistance value is approximately constant), sufficient magnetic field is applied to element 2.
a, 2b, the value of the output VOIJt will not change rfV due to errors and slight fluctuations in the magnetization strength when installing the permanent H1'/E6. This point is similar to the previously proposed patent application No. 72201/1983. In FIG. 3, the characteristics of lnSb are shown by dotted lines, and it can be seen that the resistance value of lnSb increases as the magnetic field strength increases.

In this way, in the above configuration, the permanent magnet 6 is arranged so that its magnetic force is along the axial direction from the rotor to the rotor 8, so unlike the conventional case, the overall size of the rotor is not increased in the radial direction. It is possible to provide a non-contact potentiometer which has superior effects such as being smaller in the radial direction of the rotor as shown by the brush cutter W in FIG. .

Next, FIGS. 4(a) and 4(b) show a second embodiment of the present invention.The differences between this second embodiment and the first embodiment are as follows. The member 12 is formed into a ring shape, and the yoke 13 is disposed within this stationary member 12, and the extending portions 13a and 13b of this 1-rib 13 are positioned so as to sandwich the stationary member 12 above and below. Even if configured as follows, the same effects as in the first embodiment can be obtained.

In this second embodiment, the same parts as those in the first embodiment are given the same reference numerals, and only the different parts have been described.

FIG. 5 shows a third embodiment of the invention. In this third embodiment, the permanent magnet 6 is arranged in the extending portion 13b, contrary to the first embodiment.
It is attached to the side.

FIG. 6 shows a fourth embodiment of the invention. In this fourth embodiment, the permanent magnet 6 is attached to the extending portion 13b side, contrary to the second embodiment. Even with configurations like these third and fourth embodiments, the same effects as in the first embodiment can be obtained. In the third and fourth embodiments, the same parts as in the first embodiment are given the same reference numerals, and only ten different parts have been described.

In the above example, J3 is strong (, magnetic t11 resistance clear 2
Although the shapes of a and 2b are circular or polygonal, the shape is not limited to this, and may be, for example, a rectangular shape.

Further, in the above embodiment, the permanent magnet 6 is used as the t1 generating means, but a thunderstone may be used as the means for generating the magnetic field.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the "potency meter" according to the present invention, and FIG. 1(a) shows a top view thereof, and FIG. Fig. 2 is a graph showing the output characteristics of the real swallow example in Fig. 1, Fig. 3 is a graph showing the characteristics of the ferromagnetic magnetoresistive cable, and Figs.
A top view, an n-side view, and FIGS. 5 and 6 are vertical cross-sectional views showing third and fourth embodiments of the present invention. In the figure, 1... Insulating board (circuit board) 2a, 2b.
...Ferromagnetic magnetoresistive rope 6...Permanent flying stones (magnetic field generating means) 7...Housing 8...Rotor 9...
・Rotation @ 10... Bearing 12... Stationary member 13
...Yaw, ri 13a, 13b,...extension part

Claims (1)

[Claims] 1) A housing, a rotor rotatably provided within the housing, and a generally annular rotor disposed substantially concentrically with the rotor and spaced apart from the rotor by a predetermined distance. an insulating substrate having a ferromagnetic magnetoresistive element whose plane direction is parallel to the rotational axis direction of the rotor; a yoke made of a magnetic material and having a U-shaped cross section and having an extension portion sandwiching a magnetoresistive element; A non-contact potentiometer comprising a magnetic magnetoresistive element and a magnetic field generating means that forms a closed magnetic path. 2) The non-contact potentiometer according to claim 1, wherein the magnetism generating means is a permanent magnet.