JPH021004Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a proximity switch whose bottom is attached to a base or the like to detect the approach, presence, passage, etc. of an object to be detected, and more specifically, to confirm its operation. The present invention relates to a proximity switch equipped with an operation display function for

[Conventional technology]

A proximity switch usually consists of a detection coil, oscillation circuit, detection circuit, amplifier circuit, etc.
When an object to be detected approaches the detection coil, which is supplied with high-frequency current from the oscillation circuit, the oscillation state of the oscillation circuit changes, so this change is detected by the detection circuit, the switching circuit is activated, and the detection is amplified by the amplifier. configured to output a signal.

A large number of such proximity switches are installed in the field, and recently proximity switches equipped with an operation display function have been used so that it can be confirmed from the outside that each proximity switch is operating reliably.
Many proximity switches equipped with such an operation display function have been proposed and put into practice to date.

FIG. 2 shows an example of a conventional proximity switch equipped with an operation display function, in which a is a perspective view, b is a cross-sectional view taken along the line C-C, and c is a cross-sectional view taken along the line D-D. In the figure, 1 is a detection coil housed in a pot-shaped core 2, and 3 is a printed circuit board on which a detection circuit section consisting of an oscillation circuit, a detection circuit, an amplification circuit, etc. is formed, and these are made of synthetic resin and are open at the bottom. It is housed in a rectangular box-like case 4, filled with synthetic resin 5, and fixed together. 6 is case 4
A lamp mounting portion protrudes inward from approximately the center of the top plate, and a hole 7 is penetrated through the center, and a light emitting diode 9 connected to a printed circuit board 3 is accommodated in the hole 7. . Reference numeral 10 denotes a cable including a power supply line and a signal line, which is connected to the printed circuit board 3 and drawn out from a take-out hole 8 provided in the case 4.

The proximity switch configured in this way is attached to a base or the like near the object to be detected, and when the object to be detected approaches the detection coil 1, the cable 1
While outputting a detection signal from the 0 signal line,
The light emitting diode 9 lights up so that the operation of the proximity switch can be confirmed from above.

[Problem that the invention attempts to solve]

By the way, when a proximity switch is installed at a site, it is often installed in a place where it is difficult to get close to check its operation, or in a place where it is difficult to see from above and can only be seen from the left, right, or rear.
However, in the proximity switch configured as described above, the light emitting diode 9 is provided exposed at the center of the top plate of the case 4, so it may be damaged due to external causes. Since the light emitting diode 9 is almost invisible at other angles, even if the light emitting diode 9 is turned on, the operation cannot be confirmed unless you look directly at the light emitting diode 9 from above.Also, due to the circuit design, the light emitting diode can only flow a small amount of current, so there is no light. It has the disadvantage that it is weak and difficult to confirm from a distance, and depending on the installation location, it may not be possible to confirm its operation.

In order to solve such problems, for example, as disclosed in Japanese Utility Model Application Publication No. 59-95549, display windows are provided on the top plate of the case and on the surface orthogonal to the top plate of the case, and the light of one light emitting element is There is a device that directs the information to the two display windows mentioned above.

However, the above display window is extremely small (about 2 mm in diameter), and since it is not possible to use a large amount of current just for the light emitting elements, the light from the light emitting elements is weak, which still limits the range in which the operation can be confirmed. (Only in a predetermined area on the front and back)

[Means for solving problems]

The present invention was developed to solve the above-mentioned conventional problems, and the detection coil and detection circuit are housed inside a box-shaped case in which the mounting part for attaching the case body is formed lower than the side surface of the case body. In the proximity switch constructed by housing, a display section made of transparent synthetic resin is provided protruding from the back surface of the case body and the top surface of the mounting section connected thereto, and a light emitting element is disposed within the display section.

[Effect]

A light emitting element protrudes from the case surface, and by combining this protruding light emitting element with a display section that refracts and emits transparent light in multiple directions, when the light emitting element emits light, the light is emitted from multiple directions of the display section. Since the display can be seen, the confirmation range of the operation display is expanded, and since the display section is transparent, even light emitted by a minute current can be easily seen from a distance, and the operation of the proximity switch can be easily confirmed.

〔Example〕

Figure 1a is a perspective view of an embodiment of the present invention, and Figure 1b is a perspective view of the embodiment of the present invention.
-A sectional view, c is a BB sectional view. In the figure, 11 is a detection coil, 12 is a core, and 13 is a printed circuit board forming a detection circuit section. Case 1
4 is almost box-shaped with one side (bottom) open, and the sloped part 1 is near the back side (cable pull-out side).
7 (which may be vertical), and a mounting portion 16 having a screw hole for mounting to a base or the like is formed continuously at a lower position. A nearly dice-shaped display section made of transparent synthetic resin (for example, acrylic, polycarbonate, etc.) and cut on multiple sides protrudes from the top surface of the mounting section 16 to the height of the falling section 17a of the inclined section 17. 18 is 2
It is integrally molded using colored mold. The shape of the display section 18 is shown in the figure by cutting out the ridge where the top surface and the front surface meet, but this section may be made into a square shape without being cut out, or the entire surface may be shaped into a diamond cut shape. For example, an appropriate shape can be selected. A recess 19 for housing a light emitting element 20 such as a light emitting diode is provided on the inner surface of the case 14 in the display section 18 . The lead wire of the light emitting element 20 housed in the recess 19 is connected to the printed circuit board 13 . In addition to being connected, the light emitting part is arranged at a position protruding from the inclined surface 17 of the case 14 and the mounting part 16. Reference numeral 21 denotes a cable outlet hole 22 provided on the side surface of the mounting portion 16;
The power line and signal line of the cable 22 inserted through the cable 1 are connected to the printed circuit board 13, respectively.

In the proximity switch of the present invention configured as described above, when an object to be detected approaches the detection coil 11, a detection signal is output from the cable 22 to an external device (not shown), and the light emitting element 20 emits light. You can check the operation. In this case, when the light emitting element 20 emits light, since the approximately dice-shaped display section 18 is made of transparent synthetic resin, each direction of the display section 18 becomes brighter, making it easier to see.
Moreover, since the display section 18 protrudes from the case body 15 and the mounting section 16, it can of course be seen from above.
The operation can be clearly and easily confirmed from the rear and left and right sides.

In the above embodiment, a case with an open bottom was used, but the present invention can be similarly applied to a case with a closed bottom and an open front or back. Further, in the above embodiment, a recess is provided in the display section and a light emitting element is housed in the recess, but the light emitting element may be inserted into the display section and molded in two colors integrally with other parts. good. Furthermore, although we have described the case where the display part is integrally molded with the case using a two-color mold, a window hole is provided at a position corresponding to the display part of the case, and a recessed part is provided in this window hole to accommodate a separately molded light emitting element. A display section or a display section formed by inserting a light emitting element and molded therein may be fitted and bonded with an adhesive or the like. It goes without saying that the shapes, dimensions, etc. of other parts are not limited to the above embodiments, and can be changed as appropriate without departing from the gist of the present invention.

[Effect of idea]

According to the present invention, the following remarkable effects can be obtained.

(1) The display section is large and each surface of the display section becomes bright due to the light emitted from the light emitting elements, making it easy to see even from a distance.

(2) Since the display part is provided to protrude from the case body and the mounting part, the operation can be easily confirmed not only from above, but also from the left, right, and rear sides, regardless of the installation location.

(3) Since each surface of the display section becomes bright due to the light emitted from the light emitting elements, the drive current for the light emitting elements can be reduced.

(4) If the transparent display part and other parts of the case are integrally molded using two-color molding as in the embodiment, manufacturing is easy.

(5) Since the light emitting element protruding from the case is covered with the display section, the light emitting element itself will not be damaged by external causes.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which a is a perspective view, b is a cross-sectional view taken along the line AA, and c is a cross-sectional view taken along the line B-B. Figure 2 shows an example of a conventional proximity switch, in which a is a perspective view, b is a cross-sectional view along line C-C, and c is a cross-sectional view of the switch.
is a DD sectional view. 11: Detection coil, 13: Printed circuit board, 1
4: Case, 15: Case body, 16: Mounting part,
17: Inclined portion, 18: Display portion, 19: Recessed portion, 2
0: Light emitting element, 22: Cable.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a proximity switch configured by accommodating a detection coil and a detection circuit section in a box-shaped case in which the mounting part for attaching the case body is formed lower than the side surface of the case body, the case A proximity switch characterized in that a display section made of transparent synthetic resin is provided protruding from the back surface of the main body and the top surface of a mounting section connected thereto, and a light emitting element is disposed within the display section. (2) The proximity switch according to claim 1, wherein the case body and the display portion are integrally molded by two-color molding. (3) The proximity switch according to claim 1, wherein the display section is provided with a recess for accommodating a light emitting element. (4) The proximity switch according to claim 1, which is a registered utility model and is formed by inserting a light emitting element into the display part and molding it integrally.