JPH0567078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a mounting method and mounting structure of a flexible printed circuit board that is often used in electrical equipment.
In particular, the present invention relates to a flexible printed circuit board mounting method and structure suitable for electrically connecting and mounting at least two flexible printed circuit boards in a cylindrical or polygonal columnar housing.

(Prior technology) Flexible printed circuit boards have traditionally been thin and highly flexible, and can be bent at will, allowing them to be efficiently stored in the narrow space inside equipment, making them suitable for use in many electrical devices. It is used.

Generally, flexible printed circuit boards are mounted in various narrow spaces of electrical equipment in a shape that matches the shape of the space.

For example, in a lens barrel such as a camera, a first flexible printed circuit board is placed in a donut-shaped space on a plane perpendicular to the barrel direction sandwiched between an outer lens barrel and an inner lens barrel. There are cases where two flexible printed circuit boards are electrically connected and mounted, or a plurality of flexible printed circuit boards are stacked and mounted in the direction of the lens barrel.

In such a case, for example in the former case, the first flexible printed circuit board 71 as shown in FIG.
is housed in the cylindrical direction of the housing 70, and a part of the connecting portion 72 is bent onto a plane perpendicular to the cylindrical direction. Then, a second flexible printed circuit board 73 in the shape of a donut or a so-called circular arc strip with a portion thereof missing is superimposed on the connecting portion 72 and then mounted by soldering 74 or the like.

In this way, the first flexible printed circuit board 71
A second circular arc strip-shaped connecting portion 72 is formed of a flat surface.
The method of stacking the flexible printed circuit boards 73 and electrically connecting them by soldering or the like and mounting them inside the housing is as shown in FIG. Another drawback is that the area for installing electric circuit elements is reduced. Furthermore, there were problems such as poor work efficiency as soldering work had to be done in a narrow space inside the housing.

(Problems to be Solved by the Invention) The present invention solves the following problems when mounting a plurality of flexible printed circuit boards in a cylindrical or polygonal columnar housing.
A mounting method and mounting structure for flexible printed circuit boards that allows for a large area for installing electric circuit elements on each flexible printed circuit board, and that can be electrically connected and mounted with high work efficiency when soldering, etc. For the purpose of providing.

(Means for solving the problem) In a method of mounting at least two flexible printed circuit boards in a cylindrical or polygonal columnar housing, a flexible printed circuit board having a first main region and a first connection region, a second flexible print having a second main region and a second connection region, the first main region being located within the housing, the first connection region protruding outside the housing; The board is arranged such that the second main region is located within the housing, the second connection region protrudes outside the housing, and at least the connection portion overlaps the first connection region, and then The first connection area and the second connection area are electrically connected outside the housing, and the first and second connection areas are further connected to each other.
The connecting area is folded and housed within the housing.

Further, in a structure in which at least two flexible printed circuit boards are mounted in a cylindrical or polygonal columnar housing, the first main portion area has a first main portion region and a first connection portion region, and the first main portion region is connected to an axis within the housing. a first flexible printed circuit board fixed substantially parallel to the direction, the first connection area protruding from the first main area, a second main area and a second connection area; The second main region is fixed within the housing at a substantially right angle in the axial direction, and the second connection region projects from the second main region and is at least connected to the first connection region. and a second flexible printed circuit board arranged so that parts thereof overlap, and the flexible printed circuit board is bent to a position substantially parallel to the second main part region while the first and second connection part regions are electrically connected to each other. That's what happened.

(Embodiment) FIG. 1 is a schematic diagram of a first embodiment of the present invention.
In the figure, 10 is a cylindrical housing such as a lens barrel, 1 is a first flexible printed circuit board, and 2 is a second flexible printed circuit board, which are schematically shown before being mounted on the cylindrical housing 10.

The first flexible printed circuit board 1 has a first main region 1a and a first connection region 1b connected to a lead-out portion 1d from the first main region 1a. The first main region 1a is connected to an aperture drive motor (not shown), an actuator for zooming, etc., and is housed in the housing 10 at a position parallel to the axis of the cylinder.

The first connection area 1b has a connection pattern part 1e for electrically connecting to another printed circuit board and a positioning hole 1c for positioning.
It stands out beyond 0.

The second flexible printed circuit board 2 has a second main region 2a and a second connection region 2b connected to a lead-out portion 2d from the second main region 2a. The second main region 2a has a donut shape, and electrical components 2e such as ICs, resistors, and capacitors are placed on the donut-shaped surface, and are formed in a direction perpendicular to the axial direction of the housing 10. It is placed and held on the stepped surface 10a. The second connection area 2b has a connection pattern part 2e for electrically connecting with the first flexible printed circuit board 1, and a positioning hole 2 for positioning the second connection area 2b.
It has c.

In this embodiment, the second main region 2a is fitted into the housing 10 in a plane perpendicular to the axial direction, but at this time, the second connecting region 2b protrudes outward from the housing 10 as shown in FIG. , is set so as to be in contact with the first connection area 1b of the first flexible printed circuit board 1 outside the housing 10. In this state, the first connection area 1b and the second connection area 2b are positioned using the positioning holes 1c and 2c using a jig (not shown), and at the same time, the connection pattern 1e, 2e are electrically connected to each other. After the connection, as shown in FIG. 3, the two connection areas 1b and 2b located outside the housing are folded toward the inside of the housing and stored so as to overlap on the surface of the second main area 2a.

After that, the lens mount 4 and the decorative tube 5 are fitted.

In this embodiment, both connection areas 1b and 2
After bending the lens holder b and storing it in the housing 10, both connection areas 1b and 2b may be fixed to the housing 10 with a fixing member, or the lens mount 4 or the like may be used to hold the connector in the housing while being pressed. You can also do it.

Note that the second main region 2a may have a donut shape or a circular arc band shape with a portion thereof missing. Further, the housing 10 may have a polygonal column shape.

As described above, in this embodiment, the connection areas 1b and 2b, which are the connection areas of each of the two flexible printed circuit boards, are made to protrude outside the housing 10, and in this state, both connection areas 1b and 2b are electrically connected. After that, both connection areas 1b and 2b are bent and housed in the housing 10.
Therefore, electrical connection work such as soldering is facilitated, and the arcuate band-shaped second main region 2a has the advantage of providing a large area for mounting electrical components.

FIG. 4 is an explanatory diagram of a second embodiment of the present invention.
In this embodiment, the second main region 2a on which the electrical components 2f of the second flexible printed circuit board are mounted is formed into a circumferential band shape, and the second main region 2a is connected to the housing 10 and the inner housing. It is housed in a donut-shaped space formed by 40 along a cylindrical wall surface. At this time, the order in which the flexible printed circuit boards are stored in the housing may be either the first flexible printed circuit board or the second flexible printed circuit board. Then, the first and second connection areas 1b and 2b of the first and second flexible printed circuit boards protruded from the housing 10 as shown by the dotted lines in the same figure, and in this state they were electrically connected. Afterwards, it is bent in the direction shown by the arrow 41 and stored in the housing 10 as shown by the solid line.

After that, the lens mount 4 and the decorative tube 5 are fitted.

FIG. 5 is a schematic diagram of a third embodiment of the present invention.
This embodiment is an improvement of the first embodiment shown in FIG. 1, and the same elements as in the first embodiment are given the same reference numerals.

In this embodiment, the second main area 2a is housed in the housing 10, and the first connection area 1b and the second connection area 2a are housed in the housing 10.
b so that when they are brought together outside the casing 10 for connection, the drawer portion 1d of the first main region 1a and the drawer portion 2d of the second main region 2a are shifted in the circumferential direction of the casing 10, i.e. A phase shift is caused.

As a result, when both the drawer parts 1d and 2d are folded and stored in the housing 10 as shown in FIG. In the first embodiment, care must be taken in setting the dimension L1 including the drawer part of the first flexible printed circuit board and the dimension L2 including the drawer part of the second flexible printed board.If L2 is too long, the drawer part 1d However, in the third embodiment, the drawer parts 1d and 2d are out of phase, so the error in the lengths L1 and L2 can be absorbed by the elasticity of the flexible printed board.
Setting of L2 is easy.

In the embodiment shown in Fig. 5, when three or more flexible printed circuit boards are mounted one on top of the other, if the lead-out portions of each flexible printed circuit board are mounted so that they are out of phase with each other, a state in which there is no repulsion force can be obtained. can be easily stored.

(Effects of the Invention) As described above, according to the present invention, in a device in which a plurality of flexible printed circuit boards are mounted in a cylindrical or polygonal columnar housing, a large area for installing electric circuit elements can be obtained, and in addition, it is possible to A flexible printed circuit board mounting method and structure that can be electrically connected and stored with high work efficiency is now possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing each element before implementation of the first embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing the implementation process of the first embodiment of the present invention, and FIG. An explanatory diagram of the second embodiment of the invention, FIG. 5, and FIG. 6 are explanatory diagrams of the third embodiment of the invention before and after implementation, and FIG.
FIG. 8 is an explanatory diagram when a conventional flexible printed circuit board is mounted within a housing. In the figure, 1 is a first flexible printed circuit board, 2 is a second flexible printed circuit board, 2a is a second main region, 1b and 2b are first and second connection regions, 1
c and 2c are positioning holes, 1d and 2d are drawer parts, 3 is solder, 4 is a lens mount, 5 is a decorative tube, 10 is a housing, 2f is an electrical component, 71 and 73 are first and second flexible printed circuit boards, 70 is a housing, and 74 is solder.

Claims (1)

[Scope of Claims] 1. In a method for mounting at least two flexible printed circuit boards in a cylindrical or polygonal columnar housing, a flexible printed circuit board having a first main region and a first connection region is mounted on the first a second flexible printed circuit board having a second main region and a second connection region, the main region being located within the housing, the first connection region protruding outside the housing; The second main region is located within the casing, the second connection region protrudes outside the casing, and is arranged so that at least the connection portion overlaps the first connection region; A first connection area and a second connection area are electrically connected outside the housing, and the first and second connection areas are further connected to each other.
A method for mounting a flexible printed circuit board, characterized in that the connection area is bent and stored in the housing. 2. In claim 1, the first main region of the first flexible printed circuit board is arranged at an axial position within the housing, while the second main region of the second flexible printed circuit board of,
A method for mounting a flexible printed circuit board arranged at a surface position substantially perpendicular to an axial surface within the housing. 3. A structure in which at least two flexible printed circuit boards are mounted in a cylindrical or polygonal columnar housing, which has a first main region and a first connection region, and the first main region is connected to an axis inside the housing. a first flexible printed circuit board fixed substantially parallel to the direction, the first connection area protruding from the first main area, a second main area and a second connection area; The second main region is fixed within the housing at a substantially right angle in the axial direction, and the second connection region projects from the second main region and is at least connected to the first connection region. a second flexible printed circuit board arranged so that parts thereof overlap, and the flexible printed circuit board is bent in a position substantially parallel to the second main part region while the first and second connection parts regions are electrically connected to each other. A flexible printed circuit board mounting structure characterized by: