JPS5820048B2 - Jidoichigimesouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a movable body driven by, for example, a motor,
Highly accurate (/Relating to a vessel movement positioning device) that automatically localizes to a pre-specified position among a plurality of positions.

Conventionally, optical or magnetic devices using alternating binary codes have been provided for this purpose, but both require a large number of detectors and the logic circuits for their control are also complex. However, there are drawbacks such as the equipment being expensive.

The present invention eliminates the drawbacks of the conventional device and provides an automatic positioning device which has a simple structure and excellent performance, and will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the device of the present invention, in which a shows a plan view of the main part thereof, and b shows a side sectional view of the main part taken along the line A--A of a.

Multiple coils X1. X2...X56 (wound around the first magnetic path 1 at required intervals along its length.

The first magnetic path 1 is made of a plate-shaped magnetic material, and has grooves G, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2, G2...
Coils X, , X2, . . . , X5 are respectively wound around the coils 5.

A substantially U-shaped second magnetic path 2 is magnetically connected to both ends 1', 1'' of the first magnetic path 1.

The connecting portion of the first magnetic path 1 and the second magnetic path 2 is connected, for example, through a suitable non-magnetic material 3 at both ends so as to supply sufficient output to the detection means described later. It is constructed to have a reluctance of .

Both the first and second magnetic paths 1 and 2 are fixed to the chassis 4.

The movable body 5 is composed of a guide section 7 provided with a guide groove 6 and a mounting section 9 on which a magnetic shunt 8 is mounted.

The movable body 5 is movably guided in the length direction of the first magnetic path 1 by engaging a guide groove 6 with a guide pin 10 implanted in the chassis 4 .

Further, a rack gear 12 is formed on a part of the movable body 5 and meshes with a pinion gear 11 connected to a motor shaft (not shown), and the position of the movable body 5 is controlled by rotation of the motor, as will be described later.

The movable body 5 is made of a magnetic material, and its mounting portion 9 is arranged so as to be in sliding contact with the second magnetic path 2 .

The magnetic shunt 8 is formed of a magnetic material, one end 8' of which is connected to the first
The other end '' is attached to the mounting part 9 via a detection means consisting of a Hall element 13, etc., and the other end '' is attached to the mounting part 9 between the first magnetic path 1 and the second magnetic path 2. The magnetic flux based on the magnetic potential difference generated in the magnetic shunt 8 and the mounting portion 9 is communicated via the Hall element 13 .

FIG. 2 shows an embodiment of the control circuit used in the device of the present invention, in which one end of the output of the Hall element 13 is led to the positive input terminal (-@) of the amplifier μ, and the other end of the output of the Hall element 13 is connected to the positive input terminal (-@) of the amplifier μ. is led to the inverting input terminal (→) of the amplifier μ via the resistor R3.

The output of the amplifier μ applies a positive or negative voltage to the terminal of the morph M depending on the input, thereby controlling its rotation direction.

Hall element 13 is connected to power source E via resistor R4 and resistor R2, and is supplied with a required control current.

A resistor R4 inserted between the output of the amplifier μ and the inverting input terminal, together with the resistor R3, determines the degree of increase of the amplifier μ to a desired value.

The series circuit of the capacitor C1 and the resistor R5 connected in parallel to the resistor R3 maintains the stability of the control system and prevents troubles caused by unnecessary amplification in the high frequency range.

Since the device of the present invention is configured as described above, the coil X1. X2...X5
If any coil among them is selected and excited by a selection device (not shown), the first magnetic path 1 is created by the magnetization of that coil.
However, since the second magnetic path 2 is connected to both ends of the first magnetic path 1 via non-magnetic materials 3, 3 having approximately the same required reluctance, the second magnetic path 1 The reluctance of the magnetic path 2 can be ignored, and its magnetic potential is considered to be approximately O over the entire length.

On the other hand, the first magnetic path 1 produces an N pole at one end and an S pole at the other end according to the direction of magnetization of the excited coil, and the magnetizing force becomes O at the center position of the excited coil.

Therefore, when the position of the magnetic shunt 8 coincides with the center position of the excited coil, the magnetic flux flows through the magnetic shunt 8 without creating a magnetic potential difference between one end 8' and the other end ''. Since it does not pass through, no output is generated in the Hall element 13.

Furthermore, if the position of the magnetic shunt 8 does not coincide with the center position of the excited coil, the first magnetic path 1 and the second magnetic path 1 are
A magnetic potential difference is generated between the magnetic path 2 and the magnetic shunt 8, and as a result of the magnetic flux passing through the magnetic shunt 8, an output is generated in the Hall element 13.

That is, the magnetizing force in the first magnetic path 1 is O at the center position of the excited coil, but as it moves away from the center position, the magnetizing force due to the north pole on one side and the south pole on the other side gradually becomes dog, and the coil becomes Since the substantially maximum magnetizing force appears over the range from each end position to the first magnetic path end on the same side, the Hall element 13 is located on the right side with respect to the center position of the coil where the magnetic shunt 8 is excited. located in or
The polarity is opposite depending on whether it is located on the left side, and an output of a magnitude corresponding to the magnetizing force in the first magnetic path 1 is produced.

Figure 3 shows this state, where the horizontal axis shows the first magnetic path 1.
Coil X1. X2...X5 position,
The vertical axis represents the magnetizing force generated in the first magnetic path when each coil is excited.

As can be seen from FIG. 3, at the center position of each excited coil, no magnetizing force is generated that would cause a magnetic flux to pass between the first and second magnetic paths via the magnetic shunt 8; At the position to the right of the center, there is a magnetizing force in the positive direction that should produce a positive output in the Hall element 13, and in the position to the left of the center of each coil, there is a magnetizing force in the negative direction that should produce a negative output in the Hall element 13. Each generates force.

Therefore, for the positive output of the Hall element 13, the magnetic shunt 8
゜That is, the rotation direction of the morph M is controlled by the amplifier μ so as to move the movable body 5 to the left, and the Hall element 13
For a negative output of It is driven in a direction approaching the excited coil, and finally stops moving at the center of the excited coil.

Therefore, the members to be driven to a plurality of predetermined positions are moved to the movable body 5.
If configured so as to be interlocked with, the driven member can be easily moved from any position to the specified position simply by exciting the coil corresponding to the desired specified position.

In the above embodiment, five coils were provided to define the position, but it is of course possible to provide any number of coils at any interval as required.

A positioning device configured in this manner is used, for example, as a head mounting plate in a cassette tape recorder.
Drive state, pause state, cue state, half winding state (
It is also particularly useful for use in automatic positioning devices that need to be positioned at a large number of positions, such as in the rewinding state and in the stopped state.

As can be seen from the above description, according to the apparatus of the present invention, it is possible to realize an automatic positioning apparatus that is easy to operate and operates reliably, despite its simple structure.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the device of the present invention, where a is a plan view of the main part thereof, b is a sectional side view of the main part taken along line A-A in a, and FIG. 2 is a diagram of the control circuit used in the device of the present invention. In one embodiment, FIG. 3 shows diagrams for explaining the operation of the apparatus of the present invention. 1...First magnetic path, 2...-Second magnetic path, 8...Magnetic shunt, 13...Detection means, X1 to X5... Coil.

Claims (1)

[Claims] 1. A first magnetic path including a plurality of coils arranged at required intervals along the length direction, and a closed magnetic path through the first magnetic path and the required reluctance at each end thereof. a second magnetic path forming a second magnetic path; a magnetic shunt disposed astride and movable in the length direction of the first magnetic path; and a portion of the magnetic shunt configured to sense magnetic flux passing through the magnetic shunt and produce a sensing output. and a movable means that is connected to the magnetic shunt and moves under the control of the detection output, and the movable means is configured such that the magnetic shunt is connected to one of the plurality of coils for excitation. When the selected coil is not located at the center position of the selected coil, the magnetizing force becomes O according to the polarity of a detection output based on the magnetizing force on the first magnetic path generated by excitation of the selected coil. An automatic positioning device characterized in that it is controlled to move the magnetic shunt to the left or right on the first magnetic path toward the center position of the coil.