JP4865353B2 - Indicator - Google Patents

Description

  The present invention relates to an indicator, for example, to presenting an output value as an analog meter value.

  Displaying the measured value with a meter is widely performed. The meter unit of such a measuring apparatus includes those that digitally display measured numerical values and those that display an indicator on a liquid crystal screen in a simulated manner due to recent progress in digitization. However, there are many users who support a meter unit that physically indicates a scale plate with a pointer, and such a meter unit is still actively produced.

A conventional meter unit will be described with reference to FIG. FIG. 9A shows a front view, and FIG. 9B shows a side view.
The meter unit 103 is used, for example, in a tuner, and displays the pitch of the pitch in an analog manner at the indicated angle of the pointer 113.
The permanent magnet 117 is fixed to the zero arm 153. However, the fixing points are not shown. The permanent magnet has a cylindrical shape and is magnetized in a direction perpendicular to the central axis 118.

The coil 115 is wound around the permanent magnet 117 so that a magnetic field is generated in a direction perpendicular to the central axis 118. The coil 115 is pivotally supported around the central axis 118 together with the pointer 113.
On both surfaces of the coil 115, a first spiral spring 111 and a second spiral spring 112 are disposed concentrically with the central shaft 118 between the zero arm 153 and the coil 15, respectively.
One end of the first spiral spring 111 is connected to a connection terminal 123 provided on the zero arm 153, and the other end is connected to a connection terminal 124 provided on the coil 115.
On the other hand, one end of the second spiral spring 112 is connected to a connection terminal 121 provided on the zero arm 153, and the other end is connected to a connection terminal 122 provided on the coil 115.
The first spiral spring 111 and the second spiral spring 112 both urge the coil 115 in the direction opposite to the direction in which the pointer 113 swings.

  The first spiral spring 111 and the second spiral spring 112 also function as a flow path for supplying a current to the coil 115, and the current flow path is the connection terminal 123 → the first spiral spring 111 → The circuit is composed of a connection terminal 124 → coil 115 → connection terminal 122 → second spiral spring 112 → connection terminal 121.

When a current flows through the coil 115, a rotational force that rotates the coil 115 around the central axis 118 is generated by the magnetic field of the permanent magnet 117, and this force and the biasing force of the first spiral spring 111 and the second spiral spring 112. The pointer 113 stops at a position where the two balance.
With the recent thinning of measuring devices, it is required to reduce the thickness of the meter portion, and the following indicator has been proposed as such a technique.
Utility Model Application Publication No. Sho 62-34370

  In this technique, the coil 115 is thinned by printing and forming the coil 115 on a substrate.

  However, with this technique, it is difficult to manufacture the coil 115 that satisfies various conditions such as torque, and it has not been put into practical use.

  Therefore, an object of the present invention is to make the indicator thin.

In order to achieve the above object, the present invention provides a fixing member in which two connection terminals are formed, a columnar permanent magnet fixed to the fixing member, and pivotally supported by the fixing member. A coil that acts on a magnetic field to generate a rotational force, a pointer that rotates together with the coil, one end connected to one of the connection terminals, the other end connected to one end of the coil, and the pointer to the rotational force A first spiral spring biased in the opposite direction, and a first spiral spring formed on the same plane as the first spiral spring, with one end connected to the other connection terminal and the other end connected to the other end of the coil. And a second spiral spring that biases the pointer in a direction opposite to the rotational force (first configuration).
In the first configuration, the first spiral spring is disposed concentrically with the second spiral spring on the outer peripheral side of the second spiral spring, and the pointer rotates in the direction of the rotational force. In this case, the first spiral spring is fixed to the fixing member and the coil so that the inner diameter of the first spiral spring is increased and the outer diameter of the second spiral spring is decreased. (Second configuration).
In the first configuration or the second configuration, the permanent magnet is alternately formed with magnetic domains of different polarities magnetized in the axial direction, and the coil is separated from the bottom surface of the permanent magnet by a predetermined distance. It can also be comprised so that it may wind so that a surface parallel to the said bottom face may be stretched (3rd structure).

  According to the present invention, it is possible to make the indicator thinner by reducing the number of parts that require clearance between components in the indicator.

(1) Outline of Embodiment The permanent magnet 17 of the meter unit 3 (FIG. 2) has a disk shape with a hole formed in the center, and is magnetized in the axial direction of the central shaft 18. A magnetic domain is formed on the bottom surface of the permanent magnet 17 so that one side is an N pole and the other is an S pole.
The coils 15 a and 15 b are wound on the same plane so as to stretch a plane parallel to the bottom surface of the permanent magnet 17, and are arranged on one bottom surface side of the permanent magnet 17 at a predetermined distance from the permanent magnet 17. Has been.

  The outer spiral spring 11 and the inner spiral spring 12 are spirally formed on the same plane. Each of these spiral springs has one end fixed to the bridge 42 and the other end fixed to the coil 15. The coil 15 is rotated around the central axis 18 with the pointer 13 (with the coil 15. Is biased in the direction opposite to the direction in which it swings.

  Thus, the meter unit 3 magnetizes the permanent magnet 17 in a direction perpendicular to the bottom surface, forms the coils 15a and 15b on the same plane, and further arranges the outer spiral spring 11 and the inner spiral spring 12 on the same plane. By forming it on top, the individual members are made thinner and the number of parts that require clearance between the parts is reduced, thereby reducing the thickness.

(2) Details of Embodiment FIG. 1 is a block diagram showing a configuration of a measuring apparatus according to the present embodiment.
The measuring device 1 is a device that measures analog data and displays it with an analog meter. For example, the measuring device 1 is a tuner that displays the pitch of a musical instrument as a meter value. In addition, various measuring devices such as a noise level display or a current value or voltage value as an ammeter or voltmeter are conceivable.
The measuring device 1 includes a signal input unit 2, a meter unit 3, an A / D conversion unit 4, a ROM (Read Only Memory) 5, a RAM (Random Access Memory) 6, a CPU (Central Processing Unit) 8, a meter driving unit 7, and the like. It is configured.

The signal input unit 2 includes a microphone, detects a sound emitted by the musical instrument, and outputs the detected sound to the A / D conversion unit 4 as an analog value.
The A / D conversion unit 4 converts the analog value detected by the signal input unit 2 into a digital value and inputs the digital value to the CPU 8.
The CPU 8 is a central control device, analyzes the frequency distribution by, for example, Fourier transforming the digital value converted by the A / D conversion unit 4, and outputs a pitch signal representing the pitch to the meter driving unit 7.
The meter driving unit 7 converts the pitch signal output from the CPU 8 into an analog value, and supplies the meter unit 3 with a current corresponding to the pitch.

The meter unit 3 drives the pointer at a predetermined indicated angle in accordance with the current supplied from the meter driving unit 7. As a result, the pitch is presented to the user by the pointer.
The ROM 5 is a read-only storage medium, and stores a program for the CPU 8 to analyze the pitch, a program for controlling the entire measuring apparatus 1, and the like.
The RAM 6 provides a working area when the CPU 8 performs information processing according to a program.

Next, the structure of the meter unit 3 (indicating device) will be described with reference to FIGS.
FIG. 2A shows the meter unit 3 viewed from a direction perpendicular to the rotation axis of the pointer.
The permanent magnet 17 is a disc-shaped magnet having a hole at the center, and is fixed to the frame 41.
Here, the disk shape is a concept included in the cylindrical shape, and the cylindrical shape having a small thickness is particularly called a disk shape.

As shown in FIG. 2C, the permanent magnet 17 is configured by combining two permanent magnets 17a and 17b that divide the disk shape into two equal parts.
The permanent magnets 17a and 17b are magnetized in the axial direction of the central axis 18 (that is, the direction perpendicular to the disk-shaped bottom surface), and are combined so that different magnetic poles are adjacent to each other.
As described above, the permanent magnet 17 has N and S poles adjacent to each other on the bottom surface, and magnetic domains having different polarities are alternately formed along the circumference of the disk shape.

Between the frame 41 (FIG. 2A) and the bridge 42, the pointer 13 and the coils 15 a and 15 b are integrally fixed to the central shaft 18.
The central shaft 18 is pivotally supported by bearings formed on the frame 41 and the bridge 42 so as to be rotatable around the axis.
As shown in FIG. 2 (c), the coil 15 a and the coil 15 b are arranged so that the surface stretched by the coils 15 a and 15 b (hereinafter referred to as the coil 15 if not distinguished) is parallel to the bottom surface of the permanent magnet 17. Wrapped in a half moon shape.
The coils 15a and 15b are connected in series, and connection terminals for supplying current are formed in the coils 15a and 15b, respectively.

An outer spiral spring 11 (first spiral spring) and an inner spiral spring 12 (second spiral spring) are disposed between the coil 15 (FIG. 2A) and the bridge 42.
Here, the arrangement of the outer spiral spring 11 and the inner spiral spring 12 will be described with reference to FIG.

The outer spiral spring 11 and the inner spiral spring 12 are formed on the same plane so that the center is on the central axis 18.
The outer spiral spring 11 is connected at one end to a bridge 42 (more precisely, a zero arm 53 (FIG. 5) described later provided on the bridge 42, but here referred to as a bridge 42 for convenience). 21 and the other end is connected to the connection terminal 22 of the coil 15b.
On the other hand, the inner spiral spring 12 has one end connected to the other connection terminal 23 formed on the bridge 42 and the other end connected to the connection terminal 24 of the coil 15a.
Here, the bridge 42, the frame 41, and a zero arm (not shown) constitute a fixing member fixed to the measuring device 1.

The outer spiral spring 11 and the inner spiral spring 12 both urge the pointer 13 in the direction opposite to the rotational force generated between the coil 15 and the permanent magnet 17.
That is, the outer spiral spring 11 and the inner spiral spring 12 have a function as a conductor for supplying a current to the coil 15 in addition to a function as a biasing means for biasing the pointer 13.

Next, the outer spiral spring 11 and the inner spiral spring 12 will be described in more detail with reference to each drawing of FIG.
Each of the outer spiral spring 11 and the inner spiral spring 12 is configured by forming a band made of an elastic member in a spiral shape.
As shown in FIG. 3A, the outer spiral spring 11 has a larger radius in the clockwise direction, and the inner spiral spring 12 has a larger radius in the counterclockwise direction.
Note that such a spiral direction is when the pointer swings clockwise, and when the pointer swings counterclockwise, the spiral direction is also reversed.

When the spiral directions of the outer spiral spring 11 and the inner spiral spring 12 are set in this way, as shown in FIG. 3B, when the pointer swings in the θ direction, the inner diameter of the outer spiral spring 11 increases. The outer shape of the inner spiral spring 12 becomes smaller.
For this reason, when the pointer is swung, it is possible to prevent the outer spiral spring 11 and the inner spiral spring 12 from interfering with each other.

Next, the difference between the torque of the coil 15 and the permanent magnet 17 of the present application and the torque of the conventional coil and permanent magnet will be described.
FIG. 4A shows the positional relationship between the coil 15 and the permanent magnet 17 when the pointer 13 is shaken (left figure) and after it is shaken (right figure) in the present embodiment. In the right figure, the direction of the torque generated in the straight line portion of the coil 15 is indicated by an arrow line (vector).
When a current is passed through the coils 15a and 15b, force is applied to various portions of the coil 15 due to the interaction between the magnetic field generated by the coil 15 and the magnetic field generated by the permanent magnet 17. Torque that contributes to the rotational movement of the pointer 13 on which the coil 15 is fixed about the central axis 18 is generated in the directions shown in the linear portions of the coils 15a and 15b, and the magnitude of the torque is 15%. Is proportional to the magnitude of the current flowing through

At a position where the torque and the force exerted by the outer spiral spring 11 and the inner spiral spring 12 in a direction against the rotation of the pointer 13 are balanced, the pointer 13 stops while maintaining the indicated angle θ.
Since the spring constants of the outer spiral spring 11 and the inner spiral spring 12 are considered to be constant regardless of the indication angle of the pointer 13, the current I supplied to the coil 15 and the indication angle θ of the pointer 13 are proportional.

FIG. 4B shows the positional relationship between the coil 115 and the permanent magnet 117 when the pointer is shaken (left figure) and after it is shaken (right figure) in the conventional meter unit 103.
In this case, the torque F acting on the coil 115 is represented by F = nIBSsin θ. Here, n is the number of turns of the coil, I is the current, B is the magnetic flux density, and θ is the indicated angle.
Thus, since the relationship between the current and the indicated angle is not linear, the conventional meter unit 103 is equipped with a circuit for correcting the current value for causing the output to be linear at the indicated angle.
As described above, in the present embodiment, since the relationship between the current value of the coil 15 and the command angle θ can be linear, a conventional circuit for correcting the current value is not necessary.

FIG. 5 is an assembly diagram of the meter unit 3. The current flow path is indicated by a thick line.
The connection terminal 23 and the connection terminal 21 are fixed to the zero arm 53, the zero arm 53 is fixed to the bridge 42, and the bridge 42 is fixed to the frame 41.
On the other hand, the coils 15 a and 15 b are fixed to the pointer 13 together with the connection terminals 24 and 22, and the pointer 13 is pivotally supported by the bearing of the frame 41 and the bridge 42 by the central shaft 18.
The current flow path is constituted by a circuit composed of the connection terminal 23 → the inner spiral spring 12 → the connection terminal 24 → the coil 15 a → the coil 15 b → the connection terminal 22 → the outer spiral spring 11 → the connection terminal 21. The direction of the current flowing through the current flow path depends on the direction in which the indication angle of the pointer 13 is rotated.

  As described above, in the present embodiment, the meter unit 3 is made thin by forming two spiral springs on the same plane, and the magnetization direction of the permanent magnet 17 is set to the direction of the central axis 18. Further thinning is achieved by magnetizing and winding the coil so that a plane parallel to the bottom surface of the permanent magnet 17 is stretched.

The meter unit 3 is also more resistant to impact than the conventional meter unit 103.
For example, when the meter unit 3 is dropped and an impact is applied, the permanent magnet 17 and the coil 15 are thinner and smaller in mass than the permanent magnet 117 and the coil 115. The possibility of deviating from 118 is smaller than that of the meter unit 103. In addition, the number of places where deformation occurs structurally is smaller than that of the meter unit 103. Furthermore, since the meter unit 3 is thin, it is stronger than the meter unit 103.

(Modification 1)
Next, Modification 1 of the present embodiment will be described with reference to FIG.
In this example, the spiral spring of the meter unit 3 is applied to the meter unit 103 of the conventional example.
Parts corresponding to the meter unit 103 and the meter unit 3 are denoted by the same reference numerals, and description thereof will be simplified or omitted.
In this modification, the outer spiral spring 11 and the inner spiral spring 12 are arranged concentrically with the central shaft 118 on one bottom surface of the permanent magnet 117 at a predetermined distance.
The outer spiral spring 11 is fixed to the zero arm 153 by the connection terminal 21 and is fixed to the coil 115 by the connection terminal 22.
The inner spiral spring 12 is fixed to the zero arm 153 by the connection terminal 23 and is fixed to the coil 115 by the connection terminal 24.
The current flow path is a circuit composed of the connection terminal 21 → the outer spiral spring 11 → the connection terminal 22 → the coil 115 → the connection terminal 24 → the inner spiral spring 12 → the connection terminal 23.

(Modification 2)
Next, a second modification of the present embodiment will be described with reference to FIG.
In this example, the first spiral spring 111 and the second spiral spring 112 of the conventional example are arranged on both bottom surfaces of the coil 15 in the meter unit 3 described in the present embodiment.
Parts corresponding to the meter unit 103 and the meter unit 3 are denoted by the same reference numerals, and description thereof will be simplified or omitted.
In the present modification, a first spiral spring 111 is disposed on one bottom surface side of the permanent magnet 17 with a predetermined distance, and a second spiral coil is disposed on the other bottom surface side of the permanent magnet 17 with a predetermined distance. A spring 112 is provided.
The first spiral spring 111 is fixed to the bridge 42 by the connection terminal 123, and is fixed to the coil 15 b by the connection terminal 124.
The second spiral spring 112 is fixed to the frame 41 by connection terminals 121 and is fixed to the coil 15 a by connection terminals 122.
The current flow path is a circuit composed of the connection terminal 123 → the first spiral spring 111 → the connection terminal 124 → the coil 15b → the coil coil 15a → the connection terminal 122 → the second spiral spring 112 → the connection terminal 121.

FIG. 8 is a diagram comparing a portion requiring clearance between components in the conventional example, the present embodiment, and the first and second modifications. Locations that require clearance are represented by circled numbers.
FIG. 8A shows a conventional meter unit 103. As shown in the figure, the meter unit 103 has seven places requiring clearance.

FIG. 8B shows the meter unit 3 according to the present embodiment. As shown in the figure, the meter unit 3 has three places requiring clearance.
Compared with the meter unit 103, the meter unit 3 has four places requiring clearance. This is because the coil 15 is formed on the same plane on one side bottom surface of the permanent magnet 17 and the outer spiral spring 11 and the inner spiral spring 12 are disposed on the same plane on one side of the coil 15.
In addition to the few places that require clearance as described above, the permanent magnet 17 is thinner than the permanent magnet 117, so that the meter portion 3 can be formed thinner.

FIG.8 (c) has shown the meter part which concerns on the modification 1, and the location which requires clearance is six places.
In the first modification, the spiral spring is disposed on one side of the coil 115, as compared with the conventional example.
FIG. 8D shows the meter unit according to the second modification, and there are four places that require clearance.
In the second modification, the permanent magnet 17 is made thinner and the coil 15 is arranged on one side of the permanent magnet 17 than in the conventional example.

The following effects can be obtained by the present embodiment described above.
(1) By magnetizing the permanent magnet 17 in a direction perpendicular to the bottom surface, the coil 15 can be disposed on the bottom surface of the permanent magnet 17.
(2) For this reason, the meter unit 3 can be thinned, and the current supplied to the coil 15 and the indicated angle of the pointer 13 can be made linear.
(3) Since the outer spiral spring 11 and the inner spiral spring 12 are formed in the same plane, it is possible to reduce the portion that requires a clearance for the arrangement of the spiral spring and to reduce the thickness of the meter unit 3.
(4) Since the meter part 3 is deformed less than the conventional product when subjected to an impact, resistance to the impact is improved.

  Further, in order to achieve the above object, the present embodiment has a disk-like permanent magnet in which magnetic domains of different polarities magnetized in the axial direction are alternately formed, a fixing member for fixing the permanent magnet, A coil that is pivotally supported on the center line of the permanent magnet by the fixing member and wound so as to stretch a plane parallel to the bottom surface at a predetermined distance from the bottom surface of the permanent magnet; and a pointer that rotates together with the coil A spiral spring having one end fixed to the fixing member, the other end fixed to the coil, and biasing the pointer in a direction opposite to the rotational force generated in the coil by the magnetic field of the permanent magnet. An indicator characterized by the above is provided.

It is the block diagram which showed the structure of the measuring device which concerns on this Embodiment. It is a figure for demonstrating the structure of the meter part which concerns on this Embodiment. It is a figure for demonstrating an outer side spiral spring and an inner side spiral spring. It is a figure for demonstrating the relationship between an electric current and instruction | indication angle. It is an assembly drawing of a meter part. It is a figure for demonstrating the modification 1. FIG. It is a figure for demonstrating the modification 2. FIG. It is a figure for demonstrating the location which requires clearance. It is a figure for demonstrating a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measuring apparatus 2 Signal input part 3 Meter part 4 A / D conversion part 5 ROM
6 RAM
7 Meter drive unit 8 CPU
DESCRIPTION OF SYMBOLS 11 Outer spiral spring 12 Inner spiral spring 13 Pointer 15 Coil 18 Center axis 21 Connection terminal 22 Connection terminal 23 Connection terminal 24 Connection terminal 41 Frame 42 Bridge

Claims (3)

A fixing member formed with two connection terminals;
A cylindrical permanent magnet fixed to the fixing member;
A coil that is pivotally supported by the fixing member and generates a rotational force by acting on the magnetic field of the permanent magnet;
A pointer that rotates with the coil;
A first spiral spring having one end connected to one of the connection terminals and the other end connected to one end of the coil, and biasing the pointer in a direction opposite to the rotational force;
Formed on the same plane as the first spiral spring, one end is connected to the other connection terminal and the other end is connected to the other end of the coil to urge the pointer in a direction opposite to the rotational force. A second spiral spring;
The indicator characterized by comprising. The first spiral spring is disposed concentrically with the second spiral spring on the outer peripheral side of the second spiral spring,
When the pointer rotates in the direction of the rotational force, the first spiral spring has a larger inner diameter, and the second spiral spring has a smaller outer diameter. The indicator according to claim 1, wherein the indicator is fixed to a coil. In the permanent magnet, magnetic domains of different polarities magnetized in the axial direction are alternately formed,
The indicator according to claim 1 or 2, wherein the coil is wound so as to stretch a plane parallel to the bottom surface at a predetermined distance from the bottom surface of the permanent magnet.

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