JPS5983002A - Magnetism detecting device - Google Patents

Abstract

PURPOSE:To ensure the detection, by constituting a switching circuit, which is operated by a signal from a Hall element, an indicator lamp, which is turned ON by the output of the switching circuit, and output terminals on one printed circuit board, and providing a unitary body by molding. CONSTITUTION:A case 1 is molded as a unitary body, wherein all parts of a magnetism detecting device are built in. At the lower side of the case 1, a rotation stopping projection 2, whose diameter is the same as that of an attaching hole to an attachinged equipment, is provided. At the upper side of the case 1, an attaching hole 3 for a flat head screw is provided. In the case 1, a Hall element 4 for detecting magnetism, an indicator lamp 5 for indicating switching states, and a printed circuit board 6 for mounting the Hall element 4 and the lamp 5 are built in. When a permanent magnet, which is provided at a movable part of the attaching equipment is brought close to the Hall element 4 and the magnetic field is applied, a fine Hall voltage is generated. The voltage is amplified, switched, and outputted to an output terminal 9. The voltage is outputted to the indicator lamp 5, and the state is indicated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The magnetic detector according to the present invention is used for detecting the position and vibration of mechanical moving parts.

Conventional Structures and Problems Conventionally, microswitches and photomicrosensors have been used for position detection.

Microswitches require a mechanism that causes mechanical moving parts to collide with the switch, and depending on the location, it may not be possible to install the above mechanism, and since it is a contact point, the response speed may be slow and the service life may be limited. It has the disadvantage of being too knowledgeable.

Further, the photomicrosensor has a configuration as shown in FIGS. 6 and 7. That is, a light emitting element (10) and a light receiving element 0v are required, and the two elements in parentheses correspond to each other via a slit. (12+ is a lamp that displays the switching status, (13) is a hole for accessing the device, ■ is a switching circuit operated by light receiving element 011, (ts
+ (161θ71 (181 is the lead wire. (19
1 is an amplifier circuit, (20) is a constant current circuit, (211 is a power supply line, and (22) is an output and terminal indicating the on/off state.

When the light-emitting element 00) and the light-receiving element (11J are shielded from light, the light-receiving element (11) becomes operational OI''l. The amplifier circuit 09) amplifies and switches the signal at the light-receiving element 0υ, and outputs the output terminal ( output to the lamp (12).
Output to + to display status.

However, a photomicrosensor requires two (2) elements, and a slit must be provided between the pixel elements.Furthermore, when installing, the entire detection section must protrude so that it can be traced with a light shielding plate. This makes it very difficult to miniaturize the device, and it has various drawbacks, such as the risk of malfunction due to disturbance light from sunlight, lighting, etc., and dirt on the light emitting element and light receiving element.
Conventionally, magnetic detection has been used to eliminate malfunctions caused by ambient light, or an amplifier circuit and a switching circuit are required, there is no indicator lamp, and a bracket is required to mount the indicator lamp. There were many difficulties, such as the need to take measures.

OBJECT OF THE INVENTION The present invention aims to provide a magnetic detector that eliminates the above-mentioned drawbacks, and is compact and easy to use by housing all parts such as an indicator lamp and a magnetic detection element in a case.
Furthermore, the present invention provides a non-contact switch that can perform reliable magnetic detection without the risk of malfunction due to ambient light or contamination of elements.

Structure of the Invention The present invention comprises a Hall element, a switching circuit operated by a signal from the Hall element, an indicator lamp lit by the output of the switching circuit, and an output terminal on one printed circuit board, The above-mentioned printed circuit board and a case having a hole for mounting at one location and a protrusion for preventing rotation are integrated and molded.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4, which show an embodiment of the present invention. (1) is a case that contains all the parts of the magnetic detector and is integrated by molding.It can be installed on the bottom side, or it can be installed on the device with a rotation stopper protrusion (2) with the same diameter as the screw hole, and on the top side. Holes (3) are provided for attachment to the device for countersunk screws. (4) is a Hall element for magnetic detection, (5) is a lamp that displays the switching state, and (6) is a Hall element (4).
) and a printed circuit board for mounting the lamp (5),
It is built into the case (1). (7) and (8) are power supply leads, and (9) is an output terminal that indicates the on/off state.

A permanent magnet installed on the movable part of the attached device is connected to a Hall element (
4) When approached and applied with a magnetic field, a minute Hall voltage is generated. Amplify and switch this.

Output to output terminal (9). At the same time, a display lamp (5
) and display the status.

The magnetic detector obtained in the above example has a width x length x height of 10mm x 2 Qmm x 5 questions, and the conventional photomicro sensor 26iy + x 26mru x
It is clear that it is smaller than the 5mm.

In addition, in the above embodiment, the lead wires are exposed directly so that the moving parts of the equipment or the magnetic detector can be approached at close range, and countersunk screws are used for mounting so that the two sides of the detector are flush. However, the present invention is not limited to this, and soldered terminals or screws other than flat head screws may be used.

FIG. 5 shows a case where the product of the present invention is used in an industrial robot, and shows a part corresponding to the base.

(23+ (241(',!51 is a movable part,
A welding machine or the like is installed above each movable part (231 (24+ (25)). Each movable part is arranged to move in the directions of arrows a, b, and c, respectively.

The product of the present invention is fixed with a bracket along the moving direction, and the position of each movable part can be detected by detecting the magnetism of a permanent magnet embedded in the movable part.

Effects of the Invention The present invention utilizes magnetism as a detection medium, eliminates the need for a mechanism that causes the mechanical movable parts to collide with the switch, and eliminates the need for a light shielding plate.In addition, the case incorporates a lamp, a detection element, and a printed circuit board that indicates changes in the switching state. By integrating and molding, it is possible to simplify the structure and reduce the size of the product, and it can be easily installed in a limited space. In addition, there is no risk of malfunction caused by external light or dirt on the element, and changes in the switching state can be quickly determined by magnetic detection, and the indicator lamp can be used to easily identify changes in the switching state. This has effects such as being able to easily determine the position.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the magnetic detector according to the present invention, Fig. 2 is a side view of the same, Fig. 3 is a plan view of the same, Fig. 4 is a block diagram of the same electric circuit, and Fig. 5 is a Fig. 6 is a perspective view of a conventional photomicrosensor, and Fig. 7 is a block diagram of the same electric circuit. )...Rotation stop protrusion, (3)...mounting hole, (4)...Hall element, (51...dimp, (6)...printed circuit board, (9
)...Output terminal agent Patent attorney Oshima -Ko Figure 2 Figure 3

Claims (1)

[Claims] (1) A Hall element, a switching circuit activated by a signal from the Hall element, an indicator lamp lit by the output of the switching circuit, and an output terminal are configured on one printed circuit board, and the printed circuit board and A magnetic detector characterized in that a case with a hole and a protrusion for rotation stopper is integrally formed with a mold for mounting at one location.