JP2002314271A - Printed board holding structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To commonly use a frame member of the same type for printed board of different specifications, secure excellent reliability in holding of a printed board even when the frame member is commonly used, and prevent deterioration of operability or operation reliability of a switching component and other electrical and electronic components mounted on the printed board. SOLUTION: In a printed board holding structure in which a frame member 1 is disposed on the rear side of a printed board 4 with a gap, a switching component 5 is mounted on the printed board 4, and predetermined pieces of a plurality of tongue pieces 3 formed by punching the frame member 1 are cut and stood so as to be brought into contact with the rear surface of the printed board 4. The printed board 4 is sandwiched between an engaging pawl 13 at an end of a spring piece 12 continuously provided to the frame member 1 and an engaging pawl 21 of a chassis 2 and a tongue piece 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed board holding structure, and more particularly to a printed board holding structure having excellent holding reliability for printed boards having different specifications.

[0002]

2. Description of the Related Art When a printed circuit board holding structure is employed in which a frame member is arranged at a rear side of a printed circuit board at an interval and the printed circuit board is pressed against the frame member to hold the frame member. In some cases, a countermeasure is provided in which a piece is provided and a printed board is pressed against the protruding piece. In that case, conventionally, considering the specifications of the printed circuit board, for example, the size and shape of the printed circuit board, the mounting location of the switch parts, etc. It was done to determine (conventional example).

On the other hand, Japanese Utility Model Laid-Open No. 4-127693 discloses a structure for holding a printed circuit board. According to this, a structure is provided between a front panel of a device and a plate-shaped frame member called a sub-panel. A resilient member is interposed between a printed circuit board on which electronic components are mounted, and the elastic member is sandwiched between the printed circuit board and the sub-panel, which are engaged with the claw-like projections on the front panel side.

Further, Japanese Utility Model Laid-Open No. 5-67073 discloses a device for operating electronic equipment.
There is a description about making it possible to compactly mount an electronic component with an operation rotary shaft such as a motor controller and a temperature controller, and to share a component regardless of whether or not the electronic component is mounted.

[0005]

In the above conventional example,
When the specifications of the printed circuit board change, it is necessary to change the specifications of the frame members accordingly.Therefore, various types of frame members that meet the specifications of the printed circuit board are required, which reduces the cost of the mold and consequently reduces the electric power. This has been an obstacle in reducing the cost of electronic devices.

Therefore, an attempt has been made to use the same type of frame member for printed circuit boards having different specifications. However, in such a case, the pressed portion of the printed circuit board against the projecting piece of the frame member and the switch to the printed circuit board are switched. In some cases, when the switch component is depressed and the switch component is pressed away from the mounting position of the component, the bending width of the printed circuit board becomes large, and operability and operation reliability of the switch component are impaired.

With respect to such operability, Japanese Utility Model Application Laid-open No.
According to the technology described in Japanese Patent Application Laid-Open No. 12-27693, the printed board is supported by an elastic member. For example, when a switch component is mounted on the printed board, the pressing force applied to the switch component is reduced by the printed board. Therefore, the operability and operation reliability of the switch component cannot be sufficiently ensured because the elastic member is absorbed by the elastic member with the displacement.

The present invention has been made under the above circumstances, and it is possible to use the same type of frame member for printed circuit boards having different specifications. The object of the present invention is to provide a printed circuit board holding structure that ensures excellent holding reliability for the printed circuit board and that does not impair the operability and operation reliability of switch components and other electrical and electronic components mounted on the printed circuit board. And

[0009]

A printed circuit board holding structure according to the present invention is provided with a tongue piece which can be cut and raised at a plurality of positions on a frame member arranged at intervals on the rear side of the printed circuit board. The desired tongue portion of the tongue portion is cut and raised toward the printed circuit board and is in contact with the rear surface of the printed circuit board. According to this,
Which tongue of the cut-and-raised tongues provided in multiple places of the frame member is cut and raised depends on the shape and size of the printed circuit board and the mounting location of electrical and electronic components such as switch parts Can be selected appropriately. Therefore, the tongue piece cut and raised and brought into contact with the rear surface of the printed circuit board makes it possible to ensure excellent holding reliability even for printed circuit boards of different specifications. It is possible to create a printed circuit board holding state that does not impair the operability and operation reliability of the electric / electronic component.

In the present invention, it is desirable that the tip of the tongue piece is formed in an arc shape, and the top of the tip of the cut and raised tongue piece contacts the rear surface of the printed circuit board. According to this, the front edge of one tongue piece and the rear surface of the printed circuit board abut at only one location, so that the printed board does not rattle at the contact location.

In the present invention, it is desirable that the number of the tongue pieces cut and raised is plural. According to this, since a plurality of portions on the rear surface of the printed board are supported by the tongue pieces, the printed board is Retention reliability is improved.

According to the present invention, the printed circuit board has a contact portion in contact with the front surface of the printed circuit board, and the printed circuit board is sandwiched by the cooperation of the contact portion and the cut and raised tongue piece in contact with the rear surface of the printed circuit board. Is desirable. According to this, the printed circuit board does not rattle back and forth.

In the present invention, it is preferable that the contact portion is formed by a locking claw bent at a tip of a spring piece integrally connected to the frame member. According to this, since the frame member provided with the tongue piece is used as the member provided with the contact portion, it is not necessary to provide the contact portion on another member, and the number of components does not need to be increased.

According to the present invention, it is desirable that the contact portion abuts on the upper edge and the lower edge of the front surface of the printed circuit board. improves.

In the present invention, on the front surface of the printed circuit board,
A switch component having an operation unit that is pressed in the direction of approaching the printed board is mounted, and the cut and raised tongue piece is in contact with the rear surface of the printed board behind the mounting position of the switch component. Is desirable. According to this, the pressing force when pressing the operating portion of the switch component is received by the tongue piece without bending the printed board, so that the operability and operation reliability of the switch component are improved.

According to the present invention, there is provided a printed circuit board holding structure in which a frame member is provided at a rear side of a printed circuit board with a space therebetween, and an operation portion which is pressed on the front surface of the printed circuit board in a direction approaching the printed circuit board. The switch component provided is mounted, and at a plurality of positions of the frame member, cut-and-raised tongue portions each having a tip edge formed in an arc shape are formed by punching, and among the tongue portions, The plurality of desired tongue pieces are cut and raised toward the printed circuit board side, and the tops of the leading edges of the tongue pieces are brought into contact with the rear surface of the printed circuit board, and the spring is integrally connected to the frame member. The locking claw bent at the tip of the piece and the locking claw provided on the chassis supporting the frame member respectively abut against the upper and lower edges of the front surface of the printed circuit board, and these respective locking are performed. nail PCB by cooperation of a plurality of tongue portions which cut and raised abutting the rear surface of the printed circuit board is held, it is possible to adopt a configuration that.

According to this, in addition to exhibiting all the above-mentioned effects, in particular, since the tongue piece is formed by punching the frame member, a spring piece having a plurality of tongue pieces and locking claws is provided. Although the manufacturing cost of the frame member having the above features is reduced, the holding reliability is enhanced by supporting the upper and lower edges of the printed circuit board with the above-described locking claws and the locking claws formed on the chassis. In addition, since these locking claws are provided on a frame member or a chassis which is essentially indispensable for the electric / electronic device, there is an effect that there is no need to increase the number of parts.

[0018]

FIG. 1 is a front view showing a frame member 1, FIG. 2 is an enlarged perspective view of a main part of the frame member 1, and FIG.
FIG. 3 is a schematic plan view of the printed board holding structure according to the embodiment of the present invention, and FIG. 4 is a schematic side view of the same.

As shown in FIG. 1, the frame member 1 is formed in a substantially rectangular shape in a front view by a metal plate, and is fixed to an electric / electronic device, for example, a video tape recorder chassis 2 in an upright state. The frame member 1 is formed by punching a plurality of tongue pieces 3 so as to be able to be cut and raised at a plurality of positions arranged in a matrix. As shown in detail in FIG. 2, each of these tongues 3
The tip edge 31 is formed in an arc shape, and when it is cut and raised, its root 32 is pushed forward so as to bend at a right angle. In FIG. 1, the tongue pieces 3 formed at a plurality of positions of the frame member 1 are almost all formed in the same direction. Or may be changed at random.

Of the plurality of tongue pieces 3 of the frame member 1, a plurality of tongue pieces 3a to be held by the frame member 1 and meeting the specifications of a printed circuit board 4 to be described later are cut and raised forward. The other tongue pieces 3 are not cut and raised and are flush with the frame member 1.

As shown in FIG. 3 and FIG.
Are arranged in parallel on the rear side of the printed circuit board 4 with a space therebetween, and the tops of the tip portions 31 of the cut and raised plurality of tongue pieces 3a are in contact with the rear surface. The printed circuit board 4 has a switch component 5 and other electric and electronic components (not shown) mounted at predetermined positions on the front surface according to the specifications. The printed board 4 has its lower edge 41 locked by the locking claws 21 provided on the chassis 2 so as to be positioned in the front-rear direction. Is locked by a locking claw 13 bent at the tip of a spring piece 12 formed by cutting and raising forward at the upper end edge of the spring piece 12. These locking claws 21 and 13 form a contact portion which comes into contact with the front surface of the printed circuit board 4, and the plurality of tongue pieces 3a described above.
The printed circuit board 4 is sandwiched in the front-rear direction by cooperating with the above.

FIG. 4 shows the front panel 6 of the video tape recorder by imaginary lines, and pressing portions 61 provided at a plurality of positions on the front panel 6 are switches mounted on the front surface of the printed circuit board 4. Each corresponds to the operation section 51 of the component 5. The operation unit 51 of the switch component 5 is a so-called key top, and the contact of the contact can be switched by pressing the operation unit 51 in the approaching direction to the printed circuit board 4 or releasing the pressing operation. ing.

In the printed circuit board holding structure described above, the tongue pieces 3 provided at a plurality of positions of the frame member 1 are provided.
.. Is appropriately selected in accordance with the shape and size of the printed circuit board 4 and the mounting position of the electric and electronic components such as the switch component 5. Specifically, if there is a tongue piece located behind the switch component 5, it is desirable that the tongue piece 3 a be cut and raised to abut the rear surface of the printed circuit board 4. Also, switch parts 5
If there is no tongue piece located behind the tongue, it is desirable to cut and raise the tongue piece 3a located closest to the switch component 5 so as to abut the rear surface of the printed circuit board 4. . By doing so, the locking claws 13, 21
And the plurality of tongue pieces 3a hold the printed circuit board 4 so as not to rattle, so that not only high holding reliability is ensured, but also the pressing force when the operating portion 51 of the switch component 5 is pressed. Since the printed circuit board 4 is received by the cut and raised tongue piece 3a without being bent, the operability of the switch component 5 is improved, and the operation reliability is improved. In particular, in this embodiment, the arc-shaped leading edge 31 of the tongue piece 3a is brought into contact with the rear surface of the printed circuit board 4, so that the leading edge 31 of one tongue piece 3a and the rear surface of the printed circuit board 4 are connected. It comes into contact with only one place. Therefore, a situation in which the printed circuit board rattles at the contact point does not occur.

In this embodiment, the tongue piece 3 is formed on the frame member 1 by stamping, and the locking claw 13 which is in contact with the upper edge 42 of the front surface of the printed circuit board 4 is connected to the frame member 1. Spring piece 1 cut and raised in 1
2, the cost is reduced as much as there is no need to add the number of parts. Also, chassis 2
In addition, the formation of the locking claw 21 which is in contact with the lower end edge 41 of the front surface of the printed circuit board 4 also helps to reduce the manufacturing cost.

[0025]

As described above, according to the printed board holding structure of the present invention, it is possible to share the same type of frame member for printed boards having different specifications. However, excellent holding reliability with respect to the printed circuit board is ensured, and furthermore, the operability and operation reliability of switch components and other electric and electronic components mounted on the printed circuit board are not impaired. Therefore, it is possible to provide a user-friendly electric and electronic device. In addition, since the tongue piece and locking claw (contact part) that are in contact with the rear surface of the printed circuit board are formed integrally with the frame member, it is not necessary to increase the number of parts and the cost can be reduced. It is.

[Brief description of the drawings]

FIG. 1 is a front view of a frame member used for a frame substrate holding structure according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of a frame member.

FIG. 3 is a schematic plan view of a printed circuit board holding structure according to the embodiment of the present invention.

FIG. 4 is a schematic side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame member 2 Chassis 3, 3a Tongue piece part 4 Printed circuit board 5 Switch component 12 Spring piece 13 Locking claw (contact part) 21 Locking claw (contact part) 31 Tip edge of tongue piece part 41 Lower end part of printed circuit board 42 Upper end of printed circuit board 51 Operation unit

Claims (8)

[Claims] 1. A printed circuit board holding structure in which a frame member is provided at a rear side of a printed circuit board with a space therebetween, and an operation portion which is pressed on a front surface of the printed circuit board in a direction approaching the printed circuit board is provided. A switch component is mounted, and a cut-and-raised tongue piece having a tip end formed in an arc shape is formed by punching at a plurality of positions of the frame member. The plurality of tongue pieces are cut and raised toward the printed circuit board side, and the tops of the leading edges of the tongue pieces are brought into contact with the rear surface of the printed circuit board, and the spring pieces integrally connected to the frame member are formed. The locking claw bent at the tip and the locking claw provided on the chassis supporting the frame member respectively contact the upper and lower edges of the front surface of the printed circuit board, and Pudding PCB holding structure characterized in that the printed circuit board is sandwiched by the cooperation of a plurality of tongue portions which cut and raised abutting the rear face of the substrate. 2. A plurality of cut-and-raised tongue portions are provided at a plurality of positions of a frame member arranged at intervals on a rear side of a printed circuit board, and a desired one of the tongue portions is printed. A printed board holding structure cut and raised toward a board and in contact with a rear surface of the printed board. 3. The printed circuit board according to claim 2, wherein a tip edge of the tongue piece is formed in an arc shape, and a top of the tip edge of the cut and raised tongue piece is in contact with a rear surface of a printed circuit board. Printed circuit board holding structure. 4. The printed circuit board holding structure according to claim 2, wherein the number of cut and raised tongue pieces is plural. 5. A printed circuit board having a contact portion in contact with the front surface of the printed circuit board, and the printed circuit board being sandwiched by cooperation of the contact portion and the cut and raised tongue piece in contact with the rear surface of the printed circuit board. The printed circuit board holding structure according to claim 2. 6. The printed circuit board holding structure according to claim 5, wherein said contact portion is formed by a locking claw bent at a tip of a spring piece integrally connected to said frame member. 7. The contact portion abuts on an upper edge and a lower edge of a front surface of the printed circuit board.
Printed circuit board holding structure described in 1. 8. A switch component provided with an operation part pressed in an approaching direction to the printed circuit board is mounted on a front surface of the printed circuit board, and a tongue piece cut and raised behind a mounting position of the switch component. 8. The printed circuit board holding structure according to claim 2, wherein the portion is in contact with a rear surface of the printed circuit board.