JPH0729672Y2 - Printed circuit board mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a housing for electronic equipment used for housing a printed circuit board, and more particularly to improvement of assemblability.

<Prior Art> The applicant of the present invention has proposed a structure for accommodating a printed circuit board, for example, in Japanese Utility Model Laid-Open No. 63-162466. FIG. 3 is a perspective view of the configuration of such a conventional device, and FIG. 4 is an assembly diagram. In the figure, the chassis 10 has a box shape and is made of a material having structural strength while having an electromagnetic shielding effect, such as aluminum. The printed circuit board 20 has electronic components such as resistors, capacitors, and ICs mounted thereon. The stud 30 is used to secure the rigidity required when the printed circuit board 20 is mounted on the chassis 10. The stud 30 secures a clearance between the two and a screw 32 is screwed through the printed circuit board 20. The guide embossing 40 is provided at four places on the side surface of the chassis 10, has a role of guiding the insertion of the printed circuit board 20 and supporting it, and is formed by a manufacturing method called double bridge embossing, for example.

On the printed circuit board 20, the component mounting prohibited area 22 is a shaded portion at both ends, and the mounting of electronic components is prohibited due to the presence of the guide embossing 40. Lead placement prohibited area 24 is stud hole 21
From the printed circuit board 20 on the insertion side to the top so that the leads of the electronic components do not protrude from the solder surface. FIG. 5 is an explanatory diagram of the lead placement prohibited area 24. Since the studs 30 are present, if the leads are present on the solder surface, insertion becomes impossible, or an undesirable phenomenon such as a short circuit occurs.

<Problems to be solved by the invention> As described above, the presence of the component mounting prohibited area 22 and the lead placement prohibited area 24 on the printed circuit board 20 reduces the degree of freedom in mounting the component and limits the stud installation place. There was a problem that it would end up.

The present invention solves such a problem, and an object of the present invention is to provide a printed circuit board mounting structure in which the reduction of the mounting area accompanying the chassis mounting of the printed circuit board is small and the degree of freedom in design is high.

<Means for Solving the Problems> According to the present invention to achieve such an object, a chassis (10) has a predetermined length (l) for holding an end portion of a printed circuit board (20).
A plurality of guide knockout parts (40) of 2) are provided on the side surface of the chassis at intervals (l3) longer than the length of the guide hitch parts. Further, on the printed circuit board, a component mounting prohibited area (22) that comes into contact with the guide ejection portion in a state where the printed circuit board is accommodated in the chassis, and the guide provided in the printed circuit board insertion direction of the component mounting prohibited area. A cutout portion (26) having a length (l5) slightly longer than the length of the punched-out portion, and a component mounting permission portion provided on the opposite side of the cutout portion along the printed circuit board insertion direction of the component mounting prohibited area. It has (28). The stud (30) is attached to the surface of the chassis that faces the printed circuit board and mounts the printed circuit board to the chassis with a predetermined clearance. Further, provided in the portion facing the stud in a state where the print is confiscated in the chassis, in a length (l8) about the length of the guide punching portion along the printed board insertion direction,
It is characterized in that it has a lead placement prohibition region (24) for prohibiting the leads attached to the electronic components mounted on the print from protruding and mounting on the stud facing surface.

<Operation> Each component of the present invention has the following operation. The end of the printed circuit board is divided into a notch for inserting a chassis, a component mounting prohibited area in contact with the guide driving portion, and a component mountable area, and an area equivalent to the component mountable area can be effectively used. . Also in the stud mounting area, the lead placement prohibited area is limited to an area substantially corresponding to the cutout portion, and the degree of freedom in component placement is increased.

<Example> The present invention will be described below with reference to the drawings.

FIG. 1 is a configuration perspective view showing an embodiment of the present invention. In the figure, the chassis 10 is of a substantially rectangular parallelepiped shape having a height h, a depth l0 and a width w0, and guide guides 40 having a length l2 are provided on both side surfaces, and studs 30 are attached to the bottom surface. The front surface (front panel) and the ceiling plate are removed, and the mounting of the printed circuit board 20 can be performed from these directions. The guide embossing 40 is composed of a front guide embossing 41 provided on the front side and a rear guide embossing 42 provided on the back side. The distance between the front and the front guide embossing 41 is 1, and the front guide embossing 41 is The interval of the rear guide launch 42 is
The distance between the rear guide ejection 42 and the rear is l4.
The height of the guide embossed 40 protruding into the chassis 10 is w2.

On both sides of the printed circuit board 20 facing each other, guide embossing 40
The component mounting prohibited area 22 that is almost the same size as the guide embossing 40, the notch 26 with the notch width w1 and the length l5 provided on the back side of the component mounting prohibited area 22, and this component mounting prohibited A component mounting permission area 28 provided on the front side of the area 22 is provided. The length l6 of the component mounting prohibited area 22 corresponds to the length l2 of the guide embossing 40, and the length l5 of the cutout portion 26 is slightly larger than the length l2 of the guide embossing 40. The length l7 of the mounting permission area 28 increases the area where components can be mounted. The stud hole 21 is used for screwing the stud 30 and the screw 32 together, and is provided on the front side of the center of the printed circuit board 20.
It exists in l8. The following relational expression holds between these lengths.

l2≅l5≅l6≅l8 = (moving amount of printed circuit board) The assembling work of the device thus configured will be described below.
FIG. 2 is an explanatory view of the main parts in the assembled state. (A) aligns the guide embossing 40 with the notch 26, and (B) shows the guide embossing 40.
And the component mounting prohibited area 22 are in contact with each other. First, the printed circuit board 20 is moved in the direction of arrow A (the height direction of the chassis 10) to align the guide embossing 40 and the notch 26, so that the printed circuit board 20 is embossed.
Pass 40. Next, when the printed circuit board 20 is moved in the direction of arrow B (backward in the same plane as the bottom), the guide is ejected.
40 and component mounting prohibited area 22 overlap. In this state, if the screw 32 is inserted into the stud hole 21, the stud 30 and the screw 32 are screwed together to fix the printed circuit board 20 to the chassis 10.

Although the case where the bottom surface of the chassis 10 and the printed circuit board 20 are placed parallel to each other has been described in the above embodiment, the present invention is not limited to this, and the bottom surface of the chassis 10 may be placed parallel to the side surface of the chassis 10. It may be the one on which the printed circuit board 20 is placed.

<Effect of Device> As described above, the present invention has the following practical effects.

When mounting the printed circuit board on the chassis, the notch is used to pass through the guide embossing part to bring the component mounting prohibited area into contact with the guide embossing part. The amount of movement is small, and the mounting area corresponding to the component mounting permission area increases.

The lead disposition prohibited area associated with the stud is reduced as compared with the conventional example, the mounting area is increased, and the degree of freedom of the stud mounting position on the printed circuit board is increased.

As in the embodiment, if the guide-pushing portion passing direction of the cutout portion and the screw tightening direction of the stud are made to coincide with each other, the assembling work becomes easy.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of an embodiment of the present invention, FIG. 2 is an explanatory view of a main part in an assembled state, FIG. 3 is a perspective view showing the structure of a conventional apparatus, FIG. 4 is an assembly view, and FIG. It is an explanatory view of a lead placement prohibited area. 10 ... Chassis, 20 ... Printed circuit board, 22 ... Parts mounting prohibited area, 24 ... Lead placement prohibited area, 26 ... Notch part, 28 ... Parts mounting permission area, 30 ... Stud, 40 ... Guide embossing part.

Claims (1)

[Scope of utility model registration request] 1. A guide punching part (40) having a predetermined length (l2) for holding an end part of a printed circuit board (20) is attached to a chassis (1).
A plurality of parts are provided on the side surface of (0) at intervals (l3) longer than the length of the guide punch-out part, and the component mounting prohibited area (22) that comes into contact with the guide punch-out part in a state where this printed circuit board is accommodated in the chassis,
A notch (26) having a length (l5) slightly longer than the length of the guide embossed portion provided in the printed circuit board insertion direction in the component mounting prohibited area, along the printed circuit board insertion direction in the component mounting prohibited area. And a printed circuit board having a component mounting permitting portion (28) provided on the opposite side of the cutout portion at the end, and attached to a surface of the chassis facing the printed circuit board, and A mounting structure of a printed circuit board having a stud (30) attached to a chassis with a predetermined clearance, wherein the guide is provided along a printed circuit board insertion direction at a portion facing the stud in a state where the print is stored in the chassis. Leads attached to the electronic parts to be mounted on the print, which are provided with a length (l8) about the length of the embossed part, project to the stud facing surface. Mounting structure of a printed circuit board, characterized in that it comprises a lead arrangement prohibition area to prohibit from being mounted (24) Te.