JPS6331319Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is applicable to a proximity switch in which a detection head is connected by a cable to a pipe-shaped storage case containing a board on which an arbitrary electronic circuit is formed.
Regarding LED mounting structure.

(b) Prior art In the proximity switch proposed and implemented in the past,
For the LED mounting structure, a hole slightly larger in diameter than the LED is pre-drilled in the storage case, a light emitting diode (LED) is inserted and fixed into the hole, and then the assembled board inserted into the case is connected between the LED and the LED. It is like connecting with a lead wire.

However, it is extremely difficult to apply this structure to a small storage case due to the connection of lead wires.

Another conventional example is to fix LEDs on a board,
Insert this into a storage case that has a small hole in an appropriate position, and pass it through the small hole into the inside of the storage case.
There is something to check for flashing LEDs.

However, this structure has the disadvantage that the range in which the blinking of the LED can be visually observed is narrowed.

Furthermore, as another conventional example, the storage case is divided into two in the axial direction, and a cutout is provided on each divided end face in a shape that allows the LED to be clamped and fixed, and the light emitting part of the LED connected to the board is It has a structure that protrudes and is attached to the case.

However, according to this structure, in the process of filling with synthetic resin etc. in order to protect and fix the components, circuit boards, etc. inserted inside the storage case, it is necessary to apply seams at the joints where the storage case is divided. This method requires a lot of man-hours, and since the case is divided, the number of parts increases.

For the above reasons, it was technically difficult to equip the small storage case used for proximity switches with LEDs.

(c) Purpose This invention is designed to be installed in a storage case.
The purpose of the present invention is to provide an LED mounting structure for a proximity switch that allows the flashing of LEDs to be confirmed over a wide range.

Another object of this invention is to provide an LED mounting structure for a proximity switch in which an LED can be easily mounted with the light emitting part of the LED protruding from the storage case.

(D) Configuration This invention is applicable to a proximity switch in which a pipe-shaped storage case containing a board on which an arbitrary electronic circuit is formed and a detection head are connected by a cable.
A notch of a predetermined length is formed along the longitudinal direction in the peripheral wall of the opening at one end of the storage case, which is the LED mounting structure, and a support member that fits into the opening is fitted into the notch. Providing a matching protrusion,
The present invention is characterized in that the substrate on which the LED is attached is inserted into the storage case so that the light emitting part of the LED protrudes from the base end of the notch, and the light emitting part is held down by the protruding piece of the support member.

(E) Embodiment FIG. 1 is a perspective view of the first embodiment of the present invention.
FIG. 2 shows a partially cutaway side view thereof.

1 is a storage case made of, for example, a stainless steel tube. A notch 2 slightly wider than the diameter of the light emitting part of the LED 4, which will be described later, is formed in one end opening of the storage case 1. The end portion of this notch 2 has a U-shape.

3a and 3b are truncated conical support members integrally molded from insulating resin. Support member 3a,
The bottom of the storage case 3b is stepped so as to fit into the opening of the storage case 1. In addition, the support member 3
Through holes a and 3b are formed in the axial direction. Further, a protrusion 7 that fits into the notch 2 of the storage case 1 is formed on the stepped portion of the support member 3a. The tip of this protruding piece 7 has an arcuate concave shape.

5 is a rectangular substrate made of ceramic.
An amplifier circuit and the like are formed on the substrate 5. 4 is an LED attached to the board 5, which indicates, for example, whether a proximity switch is ON or OFF. Cables 6 are inserted through the support members 6a and 6b and connected to both short sides of the board 5. A detection coil section (not shown) is connected to one end of one cable 6, and a power supply section is connected to the other cable 6.

Therefore, the light emitting part of the LED 4 is cut out in the notch 2.
The board 5 is inserted into the storage case 1 so as to protrude from the terminal end of the board 5 . Then, the support members 3a and 3b, through which the cable 6 is inserted, are fitted into the storage case 1. At this time, the protruding piece 7 of the support member 3a holds down the light emitting part of the LED 4 protruding from the notch.

After the supporting members 3a and 3b are fitted into the storage case, the storage case 1 is inserted in order to fix the substrate 5, etc.
It is desirable that an insulating resin be injected into the inside.

3 and 4 show a perspective view and a sectional view of a second embodiment of this invention. In this figure, the same parts as in FIG. 1 are indicated by the same reference numerals.

In this embodiment, a square storage case 11
A V-shaped notch 12 having an arcuate bottom is formed at one end of the opening. Then, a protruding piece that fits into this notch 12 and has an arcuate concave tip is formed on the support member 13a.

The light emitting portion of the LED 4 attached to the substrate 5 can also be clamped and fixed by the storage case 11 and the support member 13a.

(f) Effects Since the LED mounting structure in the proximity switch according to this invention is formed as described above, the light emitting part of the LED protrudes from the storage case. Therefore, the range in which blinking of the LED can be visually confirmed is wide.

Further, in this invention, the LED is attached to the board in advance, and the light emitting part of the LED is pressed to the bottom of the notch of the storage case with a protruding piece of the support member. Then,
It is very easy to attach LEDs to small storage cases.

[Brief explanation of drawings]

1 and 2 are a perspective view and a partially cutaway side view showing a first embodiment of this invention, and FIG.
FIG. 4 is a perspective view and a sectional view showing a second embodiment of this invention. 1, 11... Storage case, 2, 12... Notch, 3a, 3b... Support member, 4... LED, 5
... Board, 6... Cable, 7... Projection piece.

Claims (1)

[Scope of Claim for Utility Model Registration] In an LED mounting structure for a proximity switch in which a pipe-shaped storage case containing a board on which an arbitrary electronic circuit is formed and a detection head are connected by a cable, one end of the storage case is opened. A notch of a predetermined length is formed along the longitudinal direction in the peripheral wall of the part, and a protruding piece that fits in the notch is provided on the support member that fits in the opening, and the board on which the LED is attached is mounted. An LED mounting structure for a proximity switch, characterized in that the LED is inserted into a storage case so that its light emitting part protrudes from the base end of the notch, and the light emitting part is held down by a protruding piece of the support member.