JPH071715Y2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic device having a terminal block inside.

[Conventional technology]

Conventionally, a photoelectric switch, which is an electronic device having a terminal block inside, has an infrared light emitting diode 102 and a phototransistor in an opening of a case 101, for example, as shown in vertical sectional views from different directions in FIGS. 5 and 6. The lens holders 104, each having an element holder 103, are mounted on the optical axis.
The case is configured by 05 to close the opening. And a plate 106 is provided above the photoelectric switch,
Light emitting diodes 107 and 108 for display are provided in a predetermined portion, and knobs and the like for sensitivity adjustment are further provided. As shown in FIG. 5, this photoelectric switch is provided with a terminal portion 109 for opening and closing an output from the outside below the switch, and a cable is inserted through an opening 110 provided on the back surface of the case to insert the terminal washer. It is fixed and connected to.

[Problems to be Solved by the Invention] However, according to such a conventional photoelectric switch, a cover for covering the terminal portion in the case is not provided. Therefore, there is a problem that the cover must be opened at the time of connection or adjustment, and electric shock may occur when the commercial AC power supply is directly connected.

The present invention has been made in view of the above conventional problems, and it is a technical object to prevent an electric shock by providing a protective cover.

[Means for Solving the Problems]

The present invention is an electronic device having a terminal block inside, wherein a case body having an open top surface and a plurality of terminal holding portions for power and output provided in the case body are formed as recesses, and terminals are provided on the bottom surface thereof. A terminal block that holds the washer and a projection that fits into the recess of the terminal block, and covers a plurality of terminal holding parts.
A terminal block cover having an elastic projection on the upper surface and having an opening at the center of the terminal; and a main body cover that covers the opening of the case main body and contacts the elastic projection of the terminal block cover. To do.

[Action]

According to the present invention having such a feature, the convex portion of the terminal block cover is fitted and fixed in the concave portion of the terminal block in the case. Then, by attaching the main body cover to the opening of the case main body, the inner wall of the main body cover comes into contact with the elastic protrusion of the terminal base cover to fix the terminal base cover. At the time of adjustment, the terminal block cover appears by opening the main body cover, and the voltage or the like of a predetermined terminal can be adjusted through the opening of the terminal block cover.

[Effect of device]

Therefore, according to the present invention, the adjustment work can be performed with the terminal block cover attached, and the possibility of electric shock during the adjustment work can be greatly reduced. Further, it is possible to easily fix the terminal block cover simply by inserting it into the terminal block.

[Explanation of Examples]

FIG. 1 is an assembly configuration diagram of a photoelectric switch according to an embodiment of the present invention, and FIGS. 2 (a), (b) and (c) are an elevation view, a front view and a side view of the terminal block cover, and FIG. The figure is a sectional view showing a state in which the terminal block cover is attached to the photoelectric switch. As shown in these figures, the photoelectric switch according to the present embodiment has a case body 1 as its housing. The case body 1 is a case-shaped member having an open upper part, and has a rectangular opening 1a provided with a lens on the front surface, and a screw groove 1b for inserting a cable obliquely downwardly on the lower surface of the rear surface thereof.
Is formed. The upper side wall of the case 1 is formed in a step shape, and an annular groove 2 is formed around the outside of the opening with a predetermined angle to the bottom surface. Also, on the front surface of the case body 1, a pair of openings is formed in the portion projecting above the groove 2.
1c and 1d are formed. An annular O-ring 3 is inserted into the groove 2 of the case body 1, and a frame 4 is inserted into the case body 1. The frame 4 is a frame-shaped member in which an element holder and a terminal block are integrally formed as shown in FIG. That is, an opening 4a is formed in the front surface of the frame 4, and inside thereof, a light emitting element, for example, an infrared light emitting diode or a light receiving element, for example, element holder portions 4b, 4c for mounting a phototransistor are formed. The upper portion of the opening 4a is cut out in an E shape to provide a pair of elastic protrusions 4d and 4e. Further, as shown in FIGS. 1 and 4, a terminal base portion 4f for mounting a terminal washer is formed on the upper back surface of the frame 4. The terminal block part 4f is formed with a recess for mounting five terminals No.1 to No.5. Of these, the terminal block that covers the upper row No.3 terminal and the middle row terminals No.1 and No.4 The cover 5 is attached to the terminal block portion 4f. Here, a recess is formed in each terminal portion of the terminal base 4f, and a terminal washer is attached to the bottom of the recess. As shown in FIG. 2, the terminal block cover 5 has a convex portion 5a formed laterally, which engages with the concave portion 4g, and a vertically extending flat surface portion 5b formed on the other side. Then, terminal numbers 1, 3 and 4 indicating the numbers of the respective terminals are respectively written on the upper surface of the terminal cover 5, and a specific terminal, for example, the position of the terminal No. 3 corresponds to the terminal washer as shown in the figure. A minute opening 5c is formed in the. Further, a projecting piece 5d having elasticity is provided at one end of the terminal block cover 5 in plan view 5a as shown in the figure.

On the other hand, a Fresnel lens 6 is attached to the opening 4a on the front surface of the frame 4 as shown in FIG. 1, and a printed circuit board 7 having an outer shape corresponding to the shape of the frame 4 is attached from the side. As shown in FIG. 1, the terminal block portion 4f of the frame 4 is provided with terminal washers 8a, 8b and 8c to 8e each having a square shape and having protrusions downwardly or laterally, one end of which is connected to the printed circuit board 7. Has been done. Further, the light emitting element 9a and the light receiving element 9b are attached to the element holder portions 4b and 4c, and the terminals thereof are connected to the printed board 7. The printed circuit board 7 is provided with a drive circuit for driving the light projecting element 9a and a detection circuit for detecting an object by intermittent signals obtained from the light receiving element 9b, the output of which is transmitted via a relay circuit to the terminal block 4f. It is given to each terminal. The printed circuit board 7 is also integrally formed with printed circuit boards 10a and 10b parallel to the upper surface of the case body 1, and a display element 11 for operation display is mounted on the upper part thereof via a spacer 12. Now, in the upper opening of the case body 1, a body cover 13
Is installed. The main body cover 13 is a substantially transparent member as shown in FIG. 1, has an open lower surface, and is attached so as to come into contact with the groove 2 provided in the case main body 1 and tighten the O-ring 3. As shown in FIG. 1 (b), an upper opening 1 of the case body 1 is formed on the inner front surface of the body cover 13.
Protrusions 13a, 13b and 13c, 13d that engage with c, 1d are provided. A hexagon nut 16 is attached below the case body 1 via an annular seal rubber 14 and a washer 15. Further, a lens cover 17 is attached to the front surface of the main body case 1.

After the terminal washer is attached to the frame of the photoelectric switch to complete the frame, the terminal block portion is covered with the terminal block cover 5. FIG. 3 is a sectional view showing a state in which the terminal block cover 5 is attached, and the convex portion 5a of the terminal block cover 5 is fitted into the concave portion of the terminal washer 8d and fixed. In this way, the terminal washers 8c, 8d and the terminal screws 8a (not shown) are covered. In this case, the projecting piece 5d of the terminal block cover 5 contacts the inner surface of the upper body cover 13 to fix the terminal block cover 5. When the photoelectric is adjusted, the adjustment is performed by removing the main body cover 13. At this time, since the terminal cover 5 is provided with the opening 5c, a terminal such as a tester is inserted through the opening, so that the predetermined terminal, In this case, the voltage of the terminal screw of the terminal washer 8c can be adjusted.

Although the present embodiment describes the proximity switch, the present invention is not limited to the proximity switch and can be applied to various electronic devices having a terminal block in the case.

[Brief description of drawings]

1 is an assembly configuration diagram of a photoelectric switch according to an embodiment of the present invention, FIG. 2 (a) is an elevation view of a terminal block cover, FIG. 2 (b) is its front view, and FIG. 2 (c). Is its side view, third
FIG. 4 is a vertical sectional view of this photoelectric switch, FIG. 4 is a perspective view from the rear of the terminal block cover, and FIGS. 5 and 6 are central vertical sectional views of a conventional photoelectric switch. 1 …… Case body, 4 …… Frame, 4f …… Terminal block,
5 ... Terminal block cover, 5a ... Convex part, 5b ... Plan view, 5c ...
… Opening, 5d… Projection, 7… Printed circuit board, 13… Body cover

Front page continuation (72) Inventor Ichiro Kondo, 10 Tadodo-cho, Hanazono-ku, Ukyo-ku, Kyoto Prefecture, Japan Tateishi Electric Co., Ltd. (56) References: 62-12230 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A case body having an open top surface, a plurality of terminal holding portions for power supply and output formed in the case body as concave portions, and a terminal block for holding a terminal washer on the bottom surface thereof, A terminal block cover that has a plurality of terminal holding parts that have a convex part that fits into a concave part of the terminal block, has an elastic protrusion on the upper surface, and has an opening at the center position of the terminal; A main body cover that covers the elastic protrusion of the terminal block cover.