JPS584987B2 - electrical indicating instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric indicator in which a signal light emitting element is attached to the tip of a pointer fixed to a moving coil, in which one of two control springs that controls the rotation of the moving coil is used. By using this as a common conductive path for the drive circuit of the moving coil and the light-emitting circuit of the signal light-emitting element, it is possible to improve the pointing accuracy of the pointer, and at the same time, facilitate the manufacturing of the meter, and furthermore, it is easier to read the pointer. Concerning electrical indicating instruments.

Traditionally, some electrical indicating instruments not only indicate the current value applied to the meter by the deflection angle of the pointer, but also by attaching a signal light emitting element to the tip of the pointer.
Electrical indicating instruments have been known that are capable of calling attention by causing the signal light emitting element to emit light at an appropriate time, such as when an applied current becomes an overcurrent.

However, such an electric indicator requires a light emitting circuit that makes a signal light emitting element attached to the pointer emit light, in addition to a moving coil drive circuit that rotates the moving coil by applied current, and these two circuits are used in the meter. In order to guide the light to the movable coil, which is the movable part of the light, two control springs were disposed in the drive circuit, and two conductive springs were disposed in the light emitting circuit.

Regarding the above-mentioned conventional electric indicator, Figs. 1 and 2 show
This will be explained in further detail with reference to the drawings.

Fig. 1 shows the movable part of a conventional electric indicator.The movable coil 1 has a coil winding 3 attached to a rectangular cylindrical coil frame 2, and pivot shafts 4 and 5 are fixed at the center of the upper and lower surfaces of the coil frame 2. It is rotatably supported by these pivot shafts 4 and 5 in cooperation with bearings (not shown).

The movable coil 1 is arranged so as to enclose a fixed cylindrical permanent magnet (not shown) therein.

A pointer 7 and a connecting terminal 8 are fixed to the upper pivot shaft 4 through an insulating plate 6.6, while being electrically insulated from each other.

Further, connection terminals 9 and 10 are similarly fixed to the lower pivot shaft 5 through an insulating plate 6.6 while being electrically insulated from each other.

One end of the coil winding 30 is soldered to the upper connecting terminal 8 and the other end is soldered to the lower connecting terminal 9.

The coiled first control spring 11 and second control spring 12 that control the rotation of the movable coil 10 both serve as a conductive path to the coil winding 3. The end is the protruding piece 8 of the connecting terminal 8.
a, the outer ends of which are soldered and connected to the applied current terminals 13 of the external circuit, respectively, and the second control spring 12
The inner end is soldered to the protruding piece 9a of the connecting terminal 9, and the outer end is connected to the applied current terminal 14 of the external circuit.

Signal light emitting element 15 attached to the tip of the metal pointer 7
One end of the terminal is directly connected to the pointer 7 by soldering, and the other end is connected to the lead wire 16.

This lead wire 16 is integrated with the pointer 7 by an appropriate means such as being wrapped around the pointer I, wound around the coil frame 2 several times, and connected to the connecting terminal 10 by soldering.

Signal input to the signal light emitting element 15 is performed through a coiled first conductive spring 17 and a second conductive spring 18.

The inner end of the first conductive spring 17 is connected to the protruding piece 7a of the metal pointer I, and its outer end is connected to the signal terminal 19 by soldering, and the inner end of the second conductive spring 18 is connected to the lower part. The outer end of the protruding piece 10a of the terminal 10 is connected to the signal terminal 20 by soldering.

Therefore, the applied current applied to the meter from the external circuit is applied to the applied current terminal 14, the second control spring 12, and the connection terminal 9.
, coil winding 3, connection terminal 8, first control spring 1
1. The applied current flows along the terminal 13 and generates a magnetic rotational driving force in the moving coil 1.

The movable coil 1 rotates to a position where this rotational driving force and the rotational control forces of the first and second control springs 11 and 120 are balanced, and the applied current value from the external circuit is indicated by the deflection angle of the pointer 7. .

Further, the signal input current that causes the signal light emitting element 15 to emit light is applied to the signal terminal 19, the first conductive spring 17, the pointer 7, the signal light emitting element 15 lead wire 16, the connection terminal 10, the second conductive spring 18, and the signal terminal 20. , and causes the signal light emitting element 15 to emit light as appropriate in accordance with the signal input.

If this is simplified and shown by main conductive paths, as shown in FIG.
A signal light emitting element 150 and a light emitting circuit 22
is formed by the first conductive spring 17, the light emitting element 15, the lead wire 16, and the second conductive spring 18.

However, in the conventional electric indicator mentioned above, the drive circuit current of the moving coil 1 only flows through the moving coil 1 (
Since the light emitting circuit current of the signal light emitting element 150 also flows in a superimposed manner, the light emitting circuit current has a negative effect on the magnetic rotational driving force of the movable coil 1, resulting in inaccurate instructions from the pointer 7. Another drawback was that it was difficult to manufacture because four coiled springs were incorporated into the meter.

The present invention provides an electrical indicator that eliminates the above-mentioned drawbacks, and embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 and FIG. 4 show an embodiment of this invention.
The difference from the conventional example shown in FIG. 1 and FIG. The point is that one end of the terminal of the signal light emitting element 15 is integrated with the pointer 7 and soldered to the connecting terminal 8 by an appropriate means such as intertwining it with the pointer I.

(Other configurations are the same as in Figure 1.) Therefore, the applied current applied to the meter from the external circuit flows along the same path as in Figures 1 and 2 and rotates the movable coil 1. On the other hand, the signal input current that causes the signal light emitting element 15 to emit light is supplied to the signal terminal 19, the conductive spring 17,
It flows along the pointer 7, the light emitting element 15, the lead wire 23, and the first control spring 11, causing the signal light emitting element 15 to emit light.

In other words, the first control spring 11 is connected to the movable coil 1
The drive circuit 21 and the light emitting circuit 22 of the signal light emitting element 150 are used in common.

Since this first control spring 11 is commonly used in the above two circuits, it is desirable that it be made of a material with lower electrical resistance.

In the same manner as shown in FIG. 2, the moving coil drive circuit 21
The signal light emitting element 150 and the light emitting circuit 22 are schematically illustrated as shown in FIG.

Therefore, only the current of the drive circuit 21 of the movable coil 1 flows through the movable coil 1, and the current of the light emitting circuit 22 does not flow through the movable coil 1, so that the pointing accuracy of the pointer 7 is improved, and at the same time, the second conductive spring 18 is Since it is unnecessary, the structure is simplified and the instrument can be manufactured easily.

FIG. 5 shows a signal light emitting element 24 and a conductive spring 25.
By adding , it is possible to display two types of signals using two signal light emitting elements.

As described above, the present invention provides a movable electric indicator in which a signal light emitting element is attached to the tip of a pointer fixed to a movable coil, and is equipped with a driving circuit for the moving coil and a light emitting circuit for the signal light emitting element. Since one of the control springs for controlling the rotation of the coil is used as a common conductive path between the first drive circuit of the movable coil and the light emitting circuit of the signal light emitting element, the light emitting circuit of the signal light emitting element Since this current does not flow through the drive circuit of the movable coil, the pointing accuracy of the pointer is improved.

At the same time, unlike the conventional method, two conductive springs are not required, and only one conductive spring is required, so that the structure is simplified and the instrument can be easily manufactured.

[Brief explanation of the drawing]

1 and 2 show a conventional example, in which FIG. 1 is a partially sectional side view of the movable main part of the meter, and FIG. 2 is a schematic electrical circuit diagram of the same. Figures 3 to 5 show embodiments of this invention.
4 is a schematic electrical circuit diagram of the same as the above, and FIG. 5 is an electrical circuit diagram in which another signal light emitting element is added to FIG. 4. DESCRIPTION OF SYMBOLS 1... Moving coil, 2... Coil winding, 7... Pointer, 11... First control spring, 12... second control spring, 1
5... Signal light emitting element, 17... Conductive spring, 21... 1 drive circuit for moving coil, 22... Light emitting circuit for signal light emitting element. .

Claims (1)

[Claims] 1. A signal light emitting element is attached to the tip of a pointer fixed to a movable coil, and in an electric indicator equipped with a drive circuit for the moving coil and a light emitting circuit for the signal light emitting element, the drive circuit for the movable coil is movable. a coil winding of the coil, a first control spring connected to one end of the coil winding, and a second control spring connected to the other end of the coil winding; A circuit is formed by a signal light emitting element, a conductive spring connected to one end of the light emitting element, and the first control spring connected to the other end of the signal light emitting element, and the first control spring is connected to the movable conductive spring. An electric indicator characterized in that the drive circuit for the coil and the light emitting circuit for the signal light emitting element are used in common.