JP2001093383A - Structure of mounting microswitch on printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of mounting a microswitch on a printed board while maintaining the stable mounting condition, and prevent the deterioration of a contact of the microswitch mounted on the printed board for providing long service. SOLUTION: A switch fixing member 22 comprising a mounting base portion 24 for a printed board 10 and a holding portion 26 for holding a microswitch 12 with its side face encircled is used to fix the microswitch 12 in a state of being held by the switch fixing member 22. The upper end 26a of the holding portion 26 of the switch fixing member 22 is higher than the upper face 12a of the microswitch 12 for preventing the excessive depression of a push button 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for mounting a micro switch on a printed circuit board.

[0002]

2. Description of the Related Art A micro switch mounted on a printed circuit board is generally formed in a substantially rectangular parallelepiped shape, has a push button on an upper surface for opening and closing a contact of the switch, and has a plurality of lower surfaces connected to wiring of the printed circuit board on a lower surface. The terminals protrude.

Conventionally, when mounting such a microswitch on a printed circuit board, it is common to insert a terminal of the microswitch into a hole provided in the printed circuit board and solder the terminal.

[0004]

However, in such a conventional mounting structure for a microswitch, it is difficult to maintain a stable mounting state, and the mounting operation is not easy.

Further, the stroke of a push button for opening and closing the contact of the microswitch opens and closes the contact due to a delicate dimension. If it is set to a position where it is completely pushed inside, there is a problem that the contacts are deteriorated and the life of the microswitch is shortened.

The present invention has been made in view of such problems, and an object of the present invention is to improve the workability of mounting a microswitch on a printed circuit board and to maintain a stable mounting state. Another object of the present invention is to extend the life of a micro switch attached to a micro switch by preventing deterioration of the contact.

[0007]

According to a first aspect of the present invention, there is provided a structure for mounting a micro switch on a printed circuit board having a push button on an upper surface for opening and closing a contact of the switch, and a lower surface connected to a wiring of the printed circuit board. A micro switch provided with terminals protruding therefrom, on a printed circuit board, comprising: a holding portion that surrounds a side surface of the micro switch and holds the micro switch; and a base that is attached to the printed circuit board. The micro switch is mounted on a printed circuit board by providing a switch fixing member and fixing the switch fixed member on the printed circuit board while holding the micro switch.

With this mounting structure, the micro switch is mounted on the printed circuit board by using the switch fixing member for holding the micro switch, so that the mounting operation of the micro switch is easy. Further, the mounted microswitch is held in a state where the side surface is surrounded by the holding portion of the switch fixing member, so that a stable mounted state can be maintained.

According to a second aspect of the present invention, in the first aspect, the upper end of the holding portion of the switch fixing member is formed higher than the upper surface of the micro switch, and the pressing member for pressing the push button is formed by the pressing member. The push-button is prevented from being pushed off by contacting the upper end of the holding portion.

With this mounting structure, the upper end of the holding portion surrounding the side surface of the microswitch is formed higher than the upper surface of the microswitch. It can be prevented that the member abuts on the upper end of the holding portion and the push button is pushed to the push-off position.

According to a third aspect of the present invention, in the first aspect, the holding portion of the switch fixing member is cut at a part of a circumferential direction surrounding the microswitch.

With this mounting structure, the holding portion surrounding the side surface of the microswitch is cut off at a part in the circumferential direction. Therefore, when the holding portion holds the microswitch, the holding portion is opened and the upper portion is opened. Alternatively, the microswitch can be incorporated from below, and can be easily held.

According to a fourth aspect of the present invention, in the third aspect, a concave portion or a convex portion is provided on a side surface of the microswitch, and a convex portion or a concave portion fitted to the concave portion or the convex portion is provided on the holding portion. It is characterized by having been done.

By providing the concave and convex parts which fit each other between the microswitch and the holding part surrounding the microswitch, the microswitch can be reliably held in the positioned state.

According to a fifth aspect of the present invention, there is provided the mounting structure according to the third or fourth aspect, wherein a concave portion is provided on an upper surface of the micro switch, and a preventing means for preventing the micro switch from floating by being inserted into the concave portion in the holding portion. It is characterized by being provided.

In this case, the lifting of the micro switch is prevented by inserting the prevention means of the holding portion into the concave portion on the upper surface of the micro switch.

According to a sixth aspect of the present invention, in the first aspect, a display for confirming a mounting state of the micro switch on the switch fixing member is provided on the printed circuit board or the mounting base of the switch fixing member. It is characterized by the following.

With this mounting structure, the state of attachment of the microswitch to the switch fixing member can be checked by checking the display provided on the printed circuit board or the switch fixing member, thereby preventing erroneous mounting of the microswitch. be able to.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a mounting structure of a micro switch according to an embodiment of the present invention on a printed circuit board before mounting, FIG. 2 is a perspective view showing the mounted state,
3 is a view as seen from the direction A in FIG. 2, FIG. 4 is a view as seen from the direction B in FIG. 2, and FIG. 5 is a perspective view of a refrigerator employing this mounting structure.

As shown in FIG. 5, the refrigerator compartment door 2 of the refrigerator 1
Is provided with a display panel 3 for displaying refrigerator interior information such as a refrigerator temperature, and a door handle 4 for opening the refrigerator compartment door 2 is provided below the display panel 3. And by touching this door opening handle 4,
An electric signal is input to a control unit (not shown) to operate a pusher 5 provided at an upper portion of the refrigerator body, and the pusher 5 pushes the back surface of the refrigerator compartment door 2 to open the door 2. .

In this embodiment, such an opening handle 4 is provided.
The present invention relates to a structure in which a micro switch for detecting an opening signal of the door 2 from an opening handle 4 is attached to a printed circuit board in a so-called touch-open type refrigerator configured so that the door 2 is opened by lightly touching the door. In such a touch-open type refrigerator, a micro switch for detecting the opening signal of the refrigerator compartment door is particularly required to have durability because the refrigerator has a long service life and the refrigerator compartment door is frequently opened and closed. Can be Therefore, the mounting structure of the present embodiment described below is effective.

As shown in FIG. 4, a printed circuit board 10 for the display panel 3 is disposed behind the door opening handle 4. On the printed circuit board 10, a micro switch for detecting an opening signal of the door 2 is provided. 12 are mounted. The printed circuit board 1 is located between the printed circuit board 10 and the door opening handle 4.
A cover 7 that covers the front surface of the micro switch 12 is provided in front of the microswitch 12. A pressing portion 6 is provided on the back surface of the door opening handle 4 so that when the user touches the door opening handle 4,
As shown by a two-dot chain line in FIGS. 3 and 4, the pressing portion 6 pushes the push button 14 of the microswitch 12 through the opening 7 a of the cover 7.

As shown in FIG.
Has a substantially rectangular parallelepiped shape, has on its upper surface a push button 14 protruding upward for opening and closing the contact of a switch, and has on its lower surface three terminals 16 connected to a printed wiring formed on the back surface of the printed circuit board 10. Is protruding.

More specifically, the push button 14 protrudes upward from a fine hole provided at one side in the longitudinal direction of the upper surface of the microswitch 12, and is pushed back into the switch 12 when pressed from above. When the pressure is released, the spring returns to its original protruding state by a spring (not shown), thereby opening and closing the internal contact.

The two long side surfaces of the microswitch 12 are provided with two concave portions 18 in the longitudinal direction. Specifically, by providing two through holes penetrating the opposing side surfaces in the longitudinal direction of the switch 12, a total of four concave portions 18 are formed on each of the two side surfaces.

A recess 20 is formed on the upper surface of the microswitch 12 on the side where the push button 14 is formed in the longitudinal direction. The concave portion 20 is also opened to the short side surface of the microswitch 12 so as to receive a nail 34 of the switch fixing member 22 described later from the front.

Reference numeral 22 denotes a switch fixing member for attaching the micro switch 12 to the printed circuit board 10, and is formed of a transparent resin material. The switch fixing member 22 includes a rectangular plate-shaped mounting base 24 which is mounted on the printed circuit board 10 by a screw 28 as a fixing tool,
It comprises a frame-shaped holding portion 26 that surrounds the four side surfaces of the microswitch 12 and holds the microswitch 12.

The mounting base 24 extends integrally from the lower end of the side wall on the long side of the holding portion 26, has a screw hole 25 through which a screw 28 is inserted, and positions the mounting base 24 on the printed circuit board 10. Projection 36 is provided from the lower surface.

As shown in FIGS. 2 to 4, the holding portion 26 has an upper end 26a of a side wall surrounding the side surface of the microswitch 12.
Are formed slightly higher than the upper surface 12 a of the microswitch 12. Specifically, the upper end 26a of the holding portion
The pressing portion 6 of the opening handle 4 is sufficiently lower than the upper surface of the push button 14 so that the contact of the push button 14 of the microswitch 12 can be reliably opened and closed, and the pressing portion 6 contacts the upper end 26a of the holding portion. In order to prevent the push button 14 from being pushed and cut off, the micro switch upper surface 12a
Is set higher. In this embodiment,
Although the upper end is set higher than the microswitch upper surface 12a over the entire side wall of the holding portion 26, the push button 1
The side wall of the holding portion 26 may be partially raised as long as it can function as a stopper for preventing the push-off of the holding member 4.

The holding portion 26 is cut 30 at a part in the circumferential direction surrounding the switch 12 in order to easily fit the micro switch 12 inside. That is,
The holding portion 26 does not surround the side surface of the microswitch 12 over the entire circumference, but has a shape in which one side wall supporting the short side surface of the switch 12 is cut off by about half.

The holding portion 26 is provided with a convex portion 32 which fits into the concave portion 18 provided on the side surface of the microswitch 12 inside the long side wall. Further, an inwardly projecting claw 34 is provided at the upper end of the cut side wall 30, and this claw 34 is inserted into the concave portion 20 provided on the upper surface of the microswitch 12, thereby lifting the switch 12. Is prevented.

A retaining claw 38 for positioning the holding portion 26 on the printed circuit board 10 is provided on the holding portion 26 from the lower end of the side wall opposite to the long side wall on which the mounting base 24 extends. Is protruding.

As shown in FIG. 1, the printed board 10 is provided in an insertion hole 40 through which the terminal 16 of the microswitch 12 is inserted, a screw hole 42 through which the screw 28 is inserted, and a mounting base 24 of the switch fixing member 22. A through hole 44 into which the projection 36 is inserted and a locking hole 46 into which a locking claw 38 provided in the holding portion 26 of the switch fixing member 22 is inserted are provided at corresponding positions. In addition, reference numeral 45 denotes a mounting base provided on the back surface of the printed circuit board 10.

The printed circuit board 10 is further provided with a mounting confirmation indicator 47 for confirming whether the switch fixing member 22 holding the microswitch 12 is mounted on the printed circuit board 10. The display 47 is formed by coloring a rectangular area slightly larger than the mounting area of the switch fixing member 22 to white, and is formed on the upper surface of the printed circuit board 10 by silk screen printing.

The mounting direction confirmation display 48 for confirming the mounting direction of the microswitch 12 held by the holding portion 26 when the switch fixing member 22 is mounted on the printed circuit board 10 is formed on the printed circuit board 10. Have been. This display 48 is, as shown in FIG.
Next to the mounting position of the microswitch 12 to which is fixed,
It is formed so as to correspond to the top surface shape of the microswitch 12. That is, the mounting confirmation display 47 is cut out in substantially the same shape as the upper surface of the microswitch 12, and a white colored portion corresponding to the push button 14 is silk-screened on the same side of the cutout in the longitudinal direction as the push button 14. It is formed by screen printing.

The micro switch 12 is connected to the printed circuit board 10
1, the microswitch 12 is first assembled into the switch fixing member 22 as shown in FIG. At this time, the holding unit 26 is opened to the left and right as indicated by an arrow X in FIG. 1 by utilizing its elasticity, and the microswitch 12 is inserted from below. And micro switch 1
The corresponding protrusions 32 of the holding portion 26 are fitted into the recesses 18 on the side surfaces of the micro switch 12, and the claws 34 of the holding portion 26 are arranged in the recesses 20 on the upper surface of the microswitch 12. This prevents the microswitch 12 from shifting in the longitudinal direction and the vertical direction, and ensures that the microswitch 12 is accurately positioned in the holding portion 26 and held.

Thereafter, the switch fixing member 22 is fixed on the printed circuit board 10 while holding the microswitch 12. For fixing, the protrusion 36 of the mounting base 24 is inserted into the through hole 44 of the printed circuit board 10, the locking claw 38 of the holding section 26 is inserted into the locking hole 46 of the printed circuit board 10, and the mounting base 24 is further screwed 28. Printed circuit board 10
Screw. At the time of fixing, the push button 1 of the microswitch 12 held by the switch fixing member 22
Whether the direction of 4 is correct is confirmed by the mounting direction confirmation display 48. As described above, the display 48 is formed at a position covered by the mounting base 24, but since the mounting base 24 is transparent, the direction of the switch can be confirmed even when the switch fixing member 22 is disposed on the substrate 10. can do. And then, the terminal 16 of the microswitch 12
Is soldered.

With the mounting structure of the present embodiment described above, the microswitch 12 is fixed to the printed circuit board 10 after being securely held by the switch fixing member 22, so that the microswitch 12 12 does not come off, and the workability of mounting the microswitch 12 is excellent.

The holding portion 26 of the switch fixing member 22
Is cut 30 at a part in the circumferential direction, so that the micro switch 12 can be easily incorporated into the holding portion 26 while having a fitting structure of the convex portion 32 and the concave portion 18 on the side surface.

Further, since the mounting direction confirmation display 48 allows the user to confirm the mounting direction of the microswitch 12 when the switch fixing member 22 is mounted on the printed circuit board 10, it is possible to prevent the switch 12 from being erroneously mounted. Note that such a display 48 is not limited to being provided on the printed circuit board 10 and may be provided on the mounting base 24 of the switch fixing member 22.

Further, whether or not the microswitch 12 is mounted can be confirmed from the mounting confirmation display 47, and it is possible to prevent forgetting to mount the switch 12.

Since the side surface of the microswitch 12 mounted on the printed circuit board 10 is surrounded by the holding portion 26, it can be maintained in a stable mounting state.

Further, since the upper end 26a of the holding portion of the switch fixing member 22 is formed slightly higher than the upper surface 12a of the microswitch, when the pressing portion 6 presses the push button 14, the contact of the switch is reliably opened and closed. While letting
Push-off of the push button 14 can be prevented, and deterioration of the contact can be prevented to extend the life.

[0045]

According to the mounting structure of the first aspect of the present invention,
The workability of mounting the microswitch is excellent, and a stable mounting state can be maintained.

According to the mounting structure of the second aspect, since the push button can be prevented from being pushed off, the deterioration of the contact can be prevented and the life of the micro switch can be extended.

According to the mounting structure of the third aspect, it is easy to hold the microswitch in the holding portion of the switch fixing member,
Excellent mounting workability.

According to the mounting structure of the fourth aspect, the microswitch can be reliably held in a state where the microswitch is positioned on the switch fixing member.

According to the mounting structure of the fifth aspect, floating of the microswitch is prevented.

According to the mounting structure of the sixth aspect, since the mounting state of the micro switch to the switch fixing member can be confirmed, it is possible to prevent the micro switch from being erroneously mounted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting structure of a micro switch on a printed circuit board according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where a microswitch is attached in the embodiment.

FIG. 3 is a cross-sectional view of the mounting structure as viewed from a direction A in FIG. 2;

FIG. 4 is a cross-sectional view of the mounting structure viewed from a direction B in FIG. 2;

FIG. 5 is a perspective view of a refrigerator to which the mounting structure of the embodiment is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Printed circuit board 12 ... Micro switch 14 ... Push button 16 ... Terminal 18, 20 ... Concave part 22 ... Switch fixing member 24 ... Mounting base 26 ... Holding part 30 ... Cutting 32 ... Convex part 34: Claw 48: Mounting direction confirmation display

Claims (6)

[Claims] 1. A structure in which a micro switch having a push button for opening and closing a contact of a switch on an upper surface and a terminal connected to a wiring of the printed circuit board on a lower surface is mounted on the printed circuit board, A switch holding member that surrounds a side surface of the micro switch and holds the micro switch; and a switch fixing member including a base mounted on the printed circuit board. The switch fixing member is mounted on the printed circuit board while the micro switch is held. By fixing on top,
A structure for mounting a micro switch on a printed circuit board, wherein the micro switch is mounted on a printed circuit board. 2. An upper end of the holding portion of the switch fixing member is formed higher than an upper surface of the microswitch, and a pressing member for pressing the push button abuts on an upper end of the holding portion so that the push button is pressed. The mounting structure according to claim 1, wherein the push-off is prevented. 3. The mounting structure according to claim 1, wherein said holding portion of said switch fixing member is cut at a part in a circumferential direction surrounding said micro switch. 4. The micro switch according to claim 3, wherein a concave portion or a convex portion is provided on a side surface of the micro switch, and a convex portion or a concave portion fitted to the concave portion or the convex portion is provided on the holding portion.
The mounting structure described. 5. The micro switch according to claim 3, wherein a concave portion is provided on an upper surface of the micro switch, and a means for preventing the micro switch from floating by being inserted into the concave portion is provided in the holding portion. Mounting structure. 6. The mounting structure according to claim 1, wherein an indication for confirming a mounting state of the micro switch on the switch fixing member is provided on the printed circuit board or a mounting base of the switch fixing member. .