JPS5818182Y2 - Proximity switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cylindrical proximity switch housed in a cylindrical case.

A cylindrical proximity switch is mounted with a belt-shaped or ring-shaped mounting member surrounding its outer circumferential surface, so if a display section for checking the operating status is provided on the outer circumferential surface, the above-mentioned mounting member can be attached to the outer circumferential surface. Since the part of the sensor coil is always covered, there is a problem that the display part may be hidden depending on the position of the mounting member. An object of the present invention is to provide a cylindrical proximity switch in which the display section is configured to emit light to eliminate the above-mentioned disadvantages.

According to the present invention, in a proximity switch, a core having a detection coil wound around the front end of a cylindrical case is housed, a circuit section is housed inside the case, and a cable is protruded from the rear end of the case. Drill a hole in the center of the core,
A feature is that an operation confirmation display section that emits light to the outside is placed inside this hole.

Therefore, since the light is emitted to the outside from the central part of the core of the detection coil, which is never hidden, the above-mentioned conventional disadvantages can be solved.

Furthermore, the present invention has the effect of facilitating adjustment work such as setting the operating distance of the proximity switch.

In other words, since most of the adjustment work is normally performed by the operator facing the sensing coil and checking the distance between the sensing coil and the object to be detected, it is possible to check the operating status using a display located in the same area as the sensing coil. This is because confirmation becomes extremely easy.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a main body case 11 is made of a cylindrical metal case, and a thread groove 12 is formed over almost the entire outer circumferential surface, and the main body case 11 is formed as a male thread as a whole.

The oaks N3 and 14 are screwed into the screw grooves 12, and the proximity switch is mounted, for example, by sandwiching a panel between the oaks N3 and 14.

A circuit section 21 such as an oscillation circuit formed on a printed circuit board is housed inside the main body case 11, and is fixed with a resin 22 filled with an insulating paper 23 and the like.

The coil case 31 is formed into a cylindrical shape with a bottom made of translucent plastic or transparent plastic, and the detection coil 3
2 and a core 33, and is filled with resin 34 through an insulating paper 37 to fix them.

A lead wire 36 of the coil 32 is protected by a vinyl tube 35 and drawn out.

The coil case 31 is fitted into the front end opening of the main body case 11.

A cable 41 forming a power line and a signal line is drawn out from the rear end of the main body case 11.

This cable 41 is attached to the main body case 11 by tightening a C-shaped stopper ring 42, a metal washer 43, and a rubber bush 44 with a screw 45.

Furthermore, a hole 52 is formed in the center of the core 33 of the detection coil 32, and a display light emitting diode 51 is placed in this hole.

Therefore, light for indicating the operating state of the proximity switch is emitted from a light source such as the light emitting diode 51 to the outside through the coil case 31, and can be easily confirmed.

Since the hole 52 is drilled in the center of the core 33 in this way, the magnetic flux density decreases within this hole 52, and as a result, even if the light emitting diode 51 is placed inside this hole 52, it will not have an adverse effect on the detection coil 32. (Incidentally, if the light emitting diode 51 is simply attached to the front end surface of the front end of the core 33 of the case 11 instead of the hole 52 in the center of the core 33, the eddy current effect will adversely affect the detection coil 32. (snarls).

Note that as shown in FIG. 2, a light source such as a light emitting diode 51
may be arranged on a printed circuit board, and the light may be guided by an optical fiber 53.

In this case, the light from the light emitting diode 5 should be efficiently incident on the end of the optical fiber 53.
1 and the end of the optical fiber 53 are connected to the container 54.
It is best to store it inside.

In the embodiment shown in FIG. 2, light can be guided by using a thin optical fiber 53 even if the gap between the detection coil 32, that is, the hole 52 in the center of the core 33 is made extremely small. It is effective for

[Brief explanation of drawings]

FIG. 1 is a side view of a first embodiment of the present invention taken in half E, and FIG. 2 is a sectional view of a portion of the second embodiment. 11...Body case, 21...Circuit section, 31...Coil case, 32...Detection coil, 33...Core, 41 ... Cable, 51 ... Light emitting diode, 53 ...
...Optical fiber.

Claims (3)

[Scope of utility model registration request] (1) It has a cylindrical case, a detection coil housed in the front end of the case and wound around a core, a circuit section housed inside the case, and a cable pulled out from the rear end of the case. 1. A proximity switch characterized in that a hole is bored in the center of the core at the front end of the case, and an operation confirmation display section that emits light to the outside is disposed in the hole. (2) The proximity switch according to claim 1, wherein the display section comprises a light emitting element disposed in a hole in the front end core. (3) A request for registration of a utility model characterized in that the display section is comprised of a light emitting element disposed inside the case and an optical fiber whose tip is disposed within the hole of the core and guides light from the light emitting element. The proximity switch according to item 1.