JP2798899B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the internal structure of electronic equipment such as a photoelectric switch.

[0002]

2. Description of the Related Art Conventional photoelectric switches are, for example, shown in FIGS.
As shown in the vertical sectional views from different directions, an element holder 104 having an infrared light emitting diode 102 and a phototransistor 103 is attached to the opening of the case 101, and the lens 105 provided on the optical axis respectively. The opening is closed. A plate 106 is provided above the photoelectric switch, and light emitting diodes 107 and 108 for display are provided at predetermined portions.
Further, a knob or the like for sensitivity adjustment is provided. In this photoelectric switch, as shown in FIG. 5, a terminal portion 109 for opening and closing an external output is provided below the switch, a cable is inserted through an opening 110 provided on the back surface of the case, and the terminal washer is connected to the terminal washer. Fixed and connected.

[0003] Japanese Utility Model Application Laid-Open No. 62-12231 discloses a photoelectric switch.
A structure for hermetically closing the operation unit of the switch is shown. This
The photoelectric switch shown in FIG.
The surface is an opening 120a, and a lens 121 is
An opening surface is formed. And a semi-cylindrical shape on the top
The engaging protrusion 122a and the rectangular engaging protrusion 122b are arranged.
You. In addition, the terminal block 123 and the light emitting / receiving element are integrated in the case.
Unit 124 is inserted and the engagement piece 125 is
Cover member 126, and cover member 126
Proximity switch constructed by locking
Have been.

[0004]

The object of the invention is to be Solved However such a
According to the first conventional photoelectric switch, since the terminal portion 109 for connecting the cable is below the photoelectric switch, it is difficult to attach / detach the terminal of the cable after mounting a printed circuit board or the like on the upper portion, and to perform wiring and maintenance work. Has the disadvantage that it takes time and effort. Although a photoelectric switch provided with a frame in a case is also used, there is a drawback in that since the element holder and the frame are not integrated, the number of mounting steps increases, the mold becomes complicated, and the manufacturing cost increases. .

In the second conventional example, the case 120
The unit 124 is inserted into the
Connect the cable to the terminal block 123 because it is not fixed
The unit 124 is easy to move, and the workability is reduced.
There was a disadvantage.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of such conventional electronic devices such as a photoelectric switch, and has been made to provide an electronic device having a relatively simple structure while facilitating assembly work. Technical issues.

[0007]

The present invention provides a case body,
An electronic device including a frame inserted into the case body and a body cover attached to the case body,
The case body has a wall portion that covers the bottom surface and the side surface and has an open top surface, a cable insertion portion provided on the wall portion, and an engagement portion provided on the side surface of the wall portion. cable are those having a terminal block to be connected, the outward projection to be fixed to engage the case main body with the engagement portion of the case body, the body cover wall which covers the top and sides And an inward projection provided inside the wall portion on the side surface thereof and engaging with the engaging portion of the case main body , and covers an upper surface opening of the case main body. The case body
And a through hole communicating with the inside and outside of the frame. The outward projection of the frame is engaged with the inside of the through hole, and the inward projection of the main body cover is engaged with the outside of the through hole.

[0008]

According to the present invention having such a feature, a through hole is provided as an engaging portion in the case main body, and the inside of the through hole is provided.
More engaging the outward projecting portions of the frame, off the case body
Fix the frame. In this state, attach the cable to the terminal block of the frame.
Cable can be connected. With the cable connected
The body cover inward from the outside through the through hole of the case body
Engage the projections. This way, the frame and the case body
The body cover and the through-hole can be shared and mounted.
You.

[0009]

FIG. 1A is a top view of a photoelectric switch according to an embodiment of the present invention, in which a central portion is cut away, and FIG.
FIG. 2 is a sectional view taken along line BB of FIG. 2, and FIG. As shown in these figures, the photoelectric switch according to the present embodiment has a case main body 1 as its housing. The case main body 1 is a housing-shaped member having an open upper part, and has a wall having a bottom surface and side surfaces. A rectangular opening 1a for providing a lens is formed on the front surface, and the upper portion is an open opening. A thread groove 1b is formed below the rear surface as a cable insertion portion for inserting a cable obliquely downward. 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 at an inclination with a predetermined angle with respect to the bottom surface. A pair of through holes 1c and 1d are formed on the front surface of the case body 1 at portions protruding above the grooves 2. This through hole is an engaging portion that engages a frame 4 and a main body cover 13 described below. An annular O-ring 3 is inserted into the groove 2 of the case main body 1, and a frame 4 is inserted into the case main body 1. The frame 4 is a frame-like 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 the opening 4a, a light projecting 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 projections 4d and 4e. As shown in FIG. 1, each of the elastic projections 4d and 4e has an outward projection. A terminal base 4f for mounting a terminal washer is formed on the upper rear surface of the frame 4, as shown in FIGS. 1 (a) and 1 (b). As shown in FIG. 3, a Fresnel lens 5 is attached to the opening 4a on the front surface of the frame 4, and a printed board 6 having an outer shape corresponding to the shape of the frame 4 is attached from the side. 2, terminal washers 7a, 7b and 7c to 7e each having a square or downwardly projecting piece are provided on the terminal base 4f of the frame 4 as shown in FIG. ing. The light emitting element 8 and the light receiving element 9 are also mounted on the element holders 4b and 4c, and their terminals are connected to the printed circuit board 6. A drive circuit for driving the light-emitting element 8 and a detection circuit for detecting an object by intermittent signals obtained from the light-receiving element 9 are mounted on the printed circuit board 6, and the output thereof is output to the terminal block 4 f via a relay circuit. Provided to each terminal. Printed circuit boards 10a and 10b parallel to the upper surface of the case body 1 are also integrally formed on the printed circuit board 6, and a display element 11 for operation display is provided above the printed circuit board 10 via a spacer 12. The spacer 12 is a cylindrical member having a protruding portion 12a parallel to the printed circuit board 10a. A body cover 13 is attached to the upper opening of the case body 1. The main body cover 13 is a substantially transparent member as shown in FIG. 1, and is a cover that covers an opening of the case main body and includes a wall portion that covers an upper surface and side surfaces. The lower surface of the body cover 13 is open, and is attached so as to contact the groove 2 provided in the case body 1 and tighten the O-ring 3. As shown in FIG. 1B, inward projections 13a, 13b and 13c, 13d that engage with the through holes 1c, 1d in the upper part of the case main body 1 are provided on the inner front surface of the side wall of the main body cover 13. Is provided. A hexagonal 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 an opening on the front surface of the case body 1.

When assembling such a photoelectric switch, the light emitting and receiving elements 8, 9 and the terminal washers 7a to 7
e, and the printed circuit boards 6, 10a, and 10b are further mounted. The light emitting and receiving elements 8,
The frame 4 is inserted into the case main body 1 after connecting the ends of the cable 9 and the terminal washers 7a to 7e, fixing the terminals of the cable (not shown) to the terminal washers using screws. At this time, the elastic protrusions 4 d and 4 e of the frame 4 are
c and 1d are engaged from the inside. Further, the O-ring 3 is inserted into the groove 2 of the case main body 1, and the main body cover 13 is mounted from above. And the inward projections 13a- of the body cover 13
13d is engaged with the through holes 1c, 1d of the case 1 from the outside and fixed, and the main body cover 13 and the back surface of the case main body 1 are fixed by screws 18 with screws.

In this case, the photoelectric switch can be easily formed. In this case, since a groove is formed in the case main body 1 and the main body cover is attached via the O-ring,
The waterproof effect is increased, and the water resistance and the like can be improved. In addition, since the terminal block is opened by opening the body cover, the terminals of the cable can be easily attached to and detached from the terminal block, and maintenance and inspection work can be facilitated.

Although the present embodiment describes a photoelectric switch, the present invention can be applied to not only the photoelectric switch but also various other electronic devices.

[0013]

As described above in detail, according to the present invention , since the frame is fixed to the case body, the cable is not required.
The frame moves when connected to the terminal block of the frame
Therefore, connection workability can be improved. Again
The frame and the main body share the through hole that is the
Because it is designed to engage with the cover, the structure of the engaging portion
And the molding of the case body is easy.
You. Also, since this engaging portion is a through hole, the thickness of the case body
Engage the projections on the frame with the cover without increasing the thickness
The effect is that sufficient depth can be ensured and secure engagement can be achieved.
Can be

[Brief description of the drawings]

FIG. 1A is a partially cutaway top view of a photoelectric switch according to an embodiment of the present invention, and FIG. 1B is a longitudinal sectional view taken along the line AA.

FIG. 2 is a BB diagram of a photoelectric switch according to an embodiment of the present invention.
It is a line sectional view.

FIG. 3 is an assembly configuration diagram of the photoelectric switch of the present embodiment.

FIG. 4 is a central longitudinal sectional view of a conventional photoelectric switch.

FIG. 5 is a central longitudinal sectional view of a conventional photoelectric switch.

FIG. 6 is an assembly configuration diagram of a photoelectric switch according to a second conventional example.
It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 1c, 1d Through-hole 2 Groove 3 O-ring 4 Frame 4b, 4c Element holder part 4d, 4e Elastic protruding piece 4f Terminal block part 6, 10a, 10b Printed circuit board 13 Main body cover 13a-13d Projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Satorukawa Omron Co., Ltd. 10 in Hanazono Todocho, Ukyo-ku, Kyoto, Japan (56) References JP-A-60-160529 (JP, A) JP-A 62-12231 (JP, U) JP-A 62-5432 (JP, U)

Claims (1)

(57) [Claims] 1. An electronic apparatus comprising: a case main body; a frame inserted into the case main body; and a main body cover attached to the case main body, wherein the case main body covers a bottom surface and a side surface. A wall having an open upper surface, a cable insertion portion provided on the wall, and an engaging portion provided on a side surface of the wall, wherein the frame has a terminal block to which a cable is connected , An outer projection that is engaged with the engaging portion of the case main body and is fixed to the case main body, wherein the main body cover has a wall portion covering an upper surface and a side surface, and an inner wall portion on the side surface. And an inward projection that engages with an engaging portion of the case main body , and covers an upper surface opening of the case main body. The engaging portion of the case main body is provided inside and outside of the case main body.
An electronic device comprising a through hole communicating with a side of the frame, wherein an outward projection of the frame is engaged inside the through hole and an inward projection of the main body cover is engaged outside.