JP2569214Y2 - Flexible board fixing mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for fixing a flexible circuit board having circuit components to a board.
For example, the present invention can be applied to a flexible circuit board for guiding an output signal of a light receiving element of an optical pickup or a camera to an external circuit or the like.

[0002]

2. Description of the Related Art As an example of a flexible circuit board for guiding an output signal of a light receiving element used in an optical pickup for an optical disk or a camera having an autofocus function to an external circuit, a flexible circuit board described in Japanese Patent Application Laid-Open No. H3-120631 is known. ing. This has a flexible substrate on which a pattern for guiding the output signal of the light receiving element is formed, and a metal plate bonded to reinforce a part of the flexible substrate. A first hole having a shape is provided, a second hole larger than the first hole is provided in the metal plate, and light receiving elements are inserted into the first and second holes from opposite sides of the metal plate. Are fixed by soldering.

[0003]

In addition to those described in the above-mentioned publications, the conventional fixing mechanism for a flexible substrate is such that an external circuit component such as a light receiving element is wired on one surface. When an external component such as a chip capacitor is provided in addition to the external circuit component, there is a problem that the area of the substrate is increased accordingly. Also,
First, solder the circuit components such as the light receiving element to the circuit board,
The flexible circuit board is placed on top of the circuit components, and the pattern of the flexible circuit board and the terminals of the circuit components are connected and fixed with bridge solder, but automation of bridge soldering is difficult, and the soldering process is also difficult. However, there is a drawback that the circuit board and the flexible circuit board are easily separated from each other.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and can reduce the area of the substrate, eliminate the need for bridge soldering, facilitate automation, and perform one-time soldering. The circuit board, flexible circuit board and circuit components are connected and fixed by
An object of the present invention is to provide a fixing mechanism for a flexible circuit board, in which the circuit board and the flexible circuit board are not easily separated from each other.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a circuit board having a circuit pattern having a circuit connection portion formed on a surface thereof, and a circuit connection connected to the circuit connection portion of the circuit board. Circuit board having a circuit pattern provided on one side with a circuit pattern having a portion, and a circuit component having a terminal portion connected to a circuit connection portion of the flexible circuit board, wherein the circuit connection portion of the circuit board and the flexible circuit The circuit connection part of the board and the terminal part of the circuit component are set in substantially the same place so that they are connected by soldering together, and flexible
A cut portion is provided near the circuit connection portion of the circuit board, and the cut portion is provided.
Exposing the circuit connection part of the circuit board from the part
Terminal part to the above-mentioned circuit connection part of the flexible circuit board.
By padding, the circuit board and the circuit connection
The circuit connection part of the flexible circuit board and the
The terminal portion was electrically soldered and connected integrally and fixed.

[0006] forming a notch in a part of the frame Kishiburu circuit board, the notch to expose the circuit connection portion of the circuit board from the soldering to connect the terminal portions of the different circuit components in the circuit connecting portion and the exposed You may.

[0007]

The circuit connection portion of the circuit board, the circuit connection portion of the flexible circuit board, and the terminal portion of the circuit component are set at substantially the same location and soldered, so that they are electrically connected and the flexible circuit is mounted. The board and the circuit components are integrally fixed to the circuit board. If a cutout portion is provided near the circuit connection portion of the flexible circuit board, the soldering of the circuit connection portion of the circuit board, the circuit connection portion of the flexible circuit board, and the terminal portion of the circuit component should be performed through the cutout portion. Can be. If a notch is formed in a part of the flexible circuit board and the circuit connection portion of the circuit board is exposed from the notch, a terminal of another circuit component can be connected to the exposed circuit connection by soldering. Can be.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a fixing mechanism of a flexible substrate according to the present invention;
In the embodiment of the present invention, a circuit board, a flexible circuit board, and a circuit component are used as main components. First, specific examples of each component will be described.

FIG. 2 shows an example of a circuit board 10 for reinforcing a flexible circuit board. 2, a circuit board 10 is made of a plate made of aluminum or the like, and has a rectangular window hole 15 for receiving a later-described circuit component body in the center. The surface of the circuit board 10 is insulated, and an appropriate number of circuit patterns 11 are formed on one surface of the circuit board 10 on an insulating layer. The circuit pattern 11 is
The terminal portion of the circuit component in combination with the circuit pattern of the flexible circuit board described later intended to be connected to a predetermined external circuit, to have contact in the middle of both end portions or a part of the circuit pattern 11 of the circuit patterns 11 It has a circuit connection part 12. An appropriate number of circuit connecting portions 14 are also formed on one surface of the circuit board 10. Each circuit connection 1
2 and 14 are arranged on both sides of the window hole 15, and the circuit connection portion 12 of one circuit pattern 11 and the circuit connection portion 12 of the second circuit pattern 11 are arranged on the lower left side in FIG. The circuit connection portions 12 of the three circuit patterns 11 and the circuit connection portions 12 of the third circuit pattern 11 are arranged on the lower right side.

FIG. 6 schematically shows a flexible circuit board 20 connected and fixed to the circuit board 10, and FIG. In FIG. 6, the flexible circuit board 20 has a complicated front shape in order to route the limited space of various devices, for example, an optical pickup, a camera, etc., while bending the space three-dimensionally. A connection fixing part 21 is formed. FIG.
In the connection fixing portion 21 of the flexible circuit board 20 for connecting to the circuit board 10, a window hole 25 having substantially the same shape and size as the window hole 15 of the circuit board 10 and a large number of circuit patterns 22 are formed. I have. The circuit pattern 22 is the window 2
5, each of the circuit patterns 22 has a circuit connecting portion 23 at an end thereof. Each circuit connection part 23 is arranged on both sides of the window 25 so as to overlap with each circuit connection part 14 of the circuit board 10.

A cut-out portion 29 is formed at the lower end on both left and right sides of the connection fixing portion 21 of the flexible circuit board 20 in FIG. When the connection fixing portion 21 is overlaid on the circuit board 10, the circuit connection portions 12 on both the left and right sides of the circuit board 10 are exposed from the cutout 29. As shown in FIG. 5, the cross-sectional structure of the flexible circuit board 20, particularly the cross-sectional structure of the connection fixing portion 21, has a flexible and insulating base 31 and a circuit connecting portion 23 formed on the base 31. And a circuit pattern subsequent thereto, and an overlay 26 for insulating and protecting the circuit connection portion 23 and the circuit pattern. A window hole 27 is formed in the overlay 26 near the circuit connection part 23 in order to connect a terminal part of a circuit component described later to each circuit connection part 23 of the flexible circuit board 20 by soldering. Also, in order to connect and fix many of the terminal parts of the circuit components to the circuit connection parts 12 and 14 of the circuit board 10 by soldering, as shown in FIGS. And an oval cutout 24 is formed through the base 31.

FIG. 4 shows an example of circuit components connected and fixed to the circuit board 10 and the flexible circuit board 20, and in the case of this embodiment, it is a photodetector in an optical pickup. In FIG. 4, the circuit component 35 has a rectangular main body, and an appropriate number of terminal portions 36 project from the main body on both left and right sides. The type and form of the circuit component 35 are not particularly limited. For example, it may be an IC or the like, or may be a circular, cylindrical or rectangular chip component.

As shown in FIGS. 1 and 5, the connection fixing portion 21 of the flexible circuit board 20 is superimposed on the circuit board 10 described above, and the window hole 25 of the flexible circuit board 20 and the window hole of the circuit board 10 are further provided. The half of the circuit component 35 main body is dropped into 15, and the terminal portion 36 of the circuit component 35 is mounted on the circuit connection portion 23 of the flexible circuit board 20. The respective circuit connecting portions 12 and 14 of the circuit board 10, the respective circuit connecting portions 23 of the flexible circuit board 20, and the respective terminal portions 36 of the circuit components 35 are aligned and soldered. In the portion where the cutout portion 24 is formed in the flexible circuit board 20, the solder is applied through the cutout portion 24 to the circuit connection portion 12 of the circuit board 10.
14, the respective circuit connecting portions 12, 1 of the circuit board 10
4, the respective circuit connecting portions 23 of the flexible circuit board 20 and the respective terminal portions 36 of the circuit component 35 are electrically connected, and the circuit board 10, the flexible circuit board 20 and the circuit component 35 are integrally fixed. In FIG.
Indicates solder in which the circuit board 10, the flexible circuit board 20, and the circuit component 35 are integrally fixed as described above.

With the circuit board 10, the flexible circuit board 20, and the circuit components 35 fixed as described above, the cutouts 29 on the left and right sides of the flexible circuit board 20 are provided.
Thus, two circuit connecting portions 12 of the circuit board 10 are exposed side by side on each of the left and right sides. Therefore, a second circuit component, for example, a chip capacitor indicated by reference numeral 18 in FIG. 2 is soldered and connected between the two circuit connecting portions 12 exposed on both right and left sides. The chip capacitor 18 is connected to the terminal portion 36 of the circuit component 35 or an external circuit through the circuit pattern 11 of the circuit board 10 and further through the circuit connecting portion 23 and the circuit pattern 22 of the flexible circuit board 20.

According to the embodiment described above, the circuit board 1
0 circuit connection parts 12 and 14 and flexible circuit board 20
The flexible circuit board 20 is connected and fixed to the circuit board 10 by setting the circuit connecting part 23 and the terminal part 36 of the circuit component 35 at substantially the same location and soldering them together. The circuit board, the flexible circuit board, and the circuit component can be connected and fixed by the above soldering, and the soldering can be easily automated.

Further, the circuit pattern 10 is also provided on the circuit board 10.
1 and the circuit connection portions 12 and 14 are formed, and a predetermined circuit is formed by combining the circuit pattern 22 and the circuit connection portion 23 of the flexible circuit board 20. Therefore, all circuit patterns are concentrated on the flexible circuit board 20. The area of the circuit board 10 and the flexible circuit board 20 can be reduced as compared with the case where the
Since another circuit component 18 can also be connected to the circuit connection part of the above, the area of the circuit board 10 and the flexible circuit board 20 can be reduced from this point, and the space can be reduced.

Further, a cutout portion 24 is provided in the vicinity of the circuit connection portion 23 of the flexible circuit board 20, the circuit connection portions 12 and 14 of the circuit board 10 are exposed from the cutout portion 24, and the terminal portion 36 of the circuit component 35 is connected. The circuit board 1 is soldered to the circuit connecting portion 23 of the flexible circuit board 20.
0 and the flexible circuit board 10
The circuit connecting portion 23 and the terminal portion 36 of the circuit component 35 are electrically and integrally connected by soldering, so that there is an advantage that the circuit board 10 and the flexible circuit board 20 are not easily separated.

The present invention can be applied not only to optical pickups and cameras, but also to any circuit using a flexible circuit board.

[0019]

According to the first aspect of the present invention, the circuit connecting portion of the circuit board, the circuit connecting portion of the flexible circuit board, and the terminal portion of the circuit component are set at substantially the same location, and these are integrally soldered. By doing so, the flexible circuit board is connected and fixed to the circuit board, so that the circuit board, the flexible circuit board, and the circuit component can be connected and fixed by a single soldering. Automation of soldering is also easy. Furthermore, a circuit pattern and a circuit connection portion are also formed on the circuit board, and a predetermined circuit is formed by combining the circuit pattern and the circuit connection portion of the flexible circuit board. The area of the circuit board and the flexible circuit board can be reduced as compared with the case of forming the circuit board, and the space can be reduced.
Also cut off near the circuit connection part of the flexible circuit board
Part, and the circuit connection part of the circuit board is exposed from this cut part
And connect the terminals of the circuit components to the circuit on the flexible circuit board.
By soldering to the connection part, the circuit connection of the circuit board
Part and circuit connection part of flexible circuit board and end of circuit component
To be soldered and connected electrically to the subunit
Therefore, compared to the case of connecting with bridge solder as before
And the circuit board and the flexible circuit board are not easily separated
There is an advantage.

[0020]

According to the invention of claim 2 , a notch is formed in a part of the flexible circuit board, a circuit connecting portion of the circuit board is exposed from the notch, and another circuit is formed in the exposed circuit connecting portion. Since the terminal portions of the components are connected by soldering, the area of the circuit board and the flexible circuit board can be reduced from this point as well.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a fixing mechanism of a flexible substrate according to the present invention.

FIG. 2 is a front view of a circuit board in the embodiment.

FIG. 3 is a front view showing a main part of the flexible circuit board in the embodiment.

FIG. 4 is a front view of the circuit component in the embodiment.

FIG. 5 is a sectional view of a main part of the embodiment.

FIG. 6 is a front view schematically showing a flexible circuit board in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Circuit board 11 Circuit pattern 12 Circuit connection part 18 Another circuit component 20 Flexible circuit board 22 Circuit pattern 23 Circuit connection part 24 Cutout part 29 Notch part 32 Solder 35 Circuit part 36 Terminal part

Claims (2)

(57) [Scope of request for utility model registration] 1. A flexible circuit comprising a circuit board having a circuit pattern having a circuit connection portion formed on a surface thereof, and a circuit pattern having a circuit connection portion connected to the circuit connection portion of the circuit board provided on one surface. And a circuit component having a terminal connected to the circuit connection of the flexible circuit board. The circuit connection of the circuit board, the circuit connection of the flexible circuit board, and the terminal of the circuit component Are set at substantially the same location so that they are integrally connected by soldering, and a cutout is provided near the circuit connection on the flexible circuit board.
The circuit connection on the circuit board is exposed from the cutout.
Terminal of the above circuit component
By soldering to the circuit connection part, the circuit board
Circuit connection part and the circuit connection part of the flexible circuit board
A flexible substrate fixing mechanism, wherein a terminal part of the circuit component is electrically and integrally soldered and connected . 2. A notch in a part of the flexible circuit board.
Is formed, and the circuit connection part of the circuit board is exposed from this notch.
Out of the circuit connection part of another circuit component.
2. The terminal part is connected by soldering.
The fixing mechanism of the flexible substrate according to the above.