JPH0650382U - Flexible board fixing mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the area of the board, to eliminate bridge solder, to facilitate automation, and to connect and fix the circuit board, flexible circuit board, and circuit components with a single solder, (EN) A flexible circuit board fixing mechanism that is hard to peel off from a flexible circuit board. A flexible circuit board having a circuit board (10) on a surface of which a circuit pattern (11) having a circuit connecting section (12) and a circuit pattern (22) having a circuit connecting section (23) connected to the circuit connecting section (12) of the circuit board (10). 20 and a circuit part 35 having a terminal part 36 connected to the circuit connecting part 23 of the flexible circuit board 20, and the circuit connecting part 12 of the circuit board 10, the circuit connecting part 23 of the flexible circuit board 20, and the circuit part. The terminal portion 36 of 35 was set at substantially the same location, and these were integrally soldered and fixed together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanism for fixing a flexible circuit board having circuit parts to the board, and is applicable to, for example, a flexible circuit board for guiding an output signal of an optical pickup or a light receiving element of a camera to an external circuit. It is a thing.

[0002]

[Prior 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 the one described in Japanese Patent Laid-Open No. 3-120631, there is known. 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 of substantially the same shape is provided, a second hole that is larger than the first hole is provided in the metal plate, and a light receiving element is inserted into the first and second holes from the opposite side of the metal plate. The terminals of the light receiving element are fixed by soldering.

[0003]

[Problems to be solved by the device]

 In addition to the one described in the above publication, the conventional flexible board fixing mechanism wires external circuit components such as light-receiving elements on one surface, so in addition to external circuit components such as light-receiving elements, chip If an external component such as a capacitor is to be provided, there is a problem in that the area of the board becomes larger accordingly. Also, circuit components such as light receiving elements should be soldered to the circuit board first, then the flexible circuit board should be overlaid on top of the circuit component, and the pattern of the flexible circuit board and the terminals of the circuit component should be connected and fixed with bridge solder. However, automation of bridge soldering is difficult, and the soldering process does not have to be performed only once, and the circuit board and the flexible circuit board are easily separated.

The present invention has been made in order to solve the above-mentioned problems of the prior art. The area of the board can be reduced, and the bridge solder can be eliminated to facilitate automation and reduce An object of the present invention is to provide a flexible circuit board fixing mechanism in which a circuit board, a flexible circuit board, and circuit components are connected and fixed by soldering, and the circuit board and the flexible circuit board are hard to separate.

[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 connecting portion on its surface and a circuit pattern having a circuit connecting portion connected to the circuit connecting portion of the circuit board on one side. A flexible circuit board provided on the surface, and a circuit component having a terminal portion connected to the circuit connecting portion of the flexible circuit board. The circuit connecting portion of the circuit board, the circuit connecting portion of the flexible circuit board, and the circuit. The flexible circuit board was connected and fixed to the circuit board by setting it at approximately the same location so that the terminal part of the component was integrally soldered and connected.

A cutout portion is provided in the vicinity of the circuit connection portion of the flexible circuit board, the circuit connection portion of the circuit board is exposed from the cutout portion, and the terminal portion of the circuit component is connected to the circuit of the flexible circuit board through the cutout portion. Alternatively, 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 may be electrically and integrally soldered to each other. Also, by forming a notch in a part of the flexible circuit board, exposing the circuit connecting part of the circuit board from this notch, and soldering the terminal part of another circuit component to the exposed circuit connecting part. Good.

[0007]

[Action]

 The circuit connection part of the circuit board, the circuit connection part of the flexible circuit board, and the terminal part of the circuit component are set at approximately the same location and soldered so that they are electrically connected and the flexible circuit board and the circuit The parts will be integrally fixed to the circuit board. If a cutout part is provided near the circuit connection part of the flexible circuit board, solder the circuit connection part of the circuit board, the circuit connection part of the flexible circuit board and the terminal part of the circuit component through the cutout part. You can By forming a cutout in a part of the flexible circuit board and exposing the circuit connection part of the circuit board from this cutout, connect the terminal of another circuit component to this exposed circuit connection part by soldering. be able to.

[0008]

【Example】

 Embodiments of a flexible substrate fixing mechanism according to the present invention will be described below with reference to the drawings. In the embodiment of the present invention, the circuit board, the flexible circuit board, and the circuit parts are the main constituent parts. First, concrete examples of the respective constituent parts will be described.

FIG. 2 shows an example of a circuit board 10 for reinforcing a flexible circuit board. In FIG. 2, the circuit board 10 is made of a plate of aluminum or the like, and a rectangular window hole 15 for receiving a circuit component body described later is formed in the central portion. The surface of the circuit board 10 is insulated, and an appropriate number of circuit patterns 11 are formed on the insulating layer on one surface of the circuit board 10. The circuit pattern 11 is for connecting the terminal portion of the circuit component to a predetermined external circuit in combination with the circuit pattern of the flexible circuit board described later, and both ends of each circuit pattern 11 or a part of the circuit pattern 11 The circuit connecting portion 12 is provided in the middle portion of the. An appropriate number of circuit connecting portions 14 are also formed on one surface of the circuit board 10. The circuit connecting portions 12 and 14 are arranged on both sides of the window hole 15, and the circuit connecting portion 12 of one circuit pattern 11 and the circuit connecting portion 12 of the second circuit pattern 11 are arranged side by side on the lower left side in FIG. The circuit connecting portion 12 of the one circuit pattern 11 and the circuit connecting portion 12 of the third circuit pattern 11 are arranged on the lower right side.

FIG. 6 shows an outline of the flexible circuit board 20 connected and fixed to the circuit board 10, and FIG. 3 shows a main part of the flexible circuit board 20. In FIG. 6, the flexible circuit board 20 has a complicated front shape in order to route various equipment such as an optical pickup and a camera while bending it in a three-dimensional manner. A connection fixing part 21 is formed. In FIG. 3, a window hole 25 of substantially the same shape and size as the window hole 15 of the circuit board 10 is formed in the connection fixing portion 21 of the flexible circuit board 20 with the circuit board 10 and a large number of circuit patterns 22 are formed. Has been formed. The circuit patterns 22 are distributed right and left so as to avoid the window holes 25, and each circuit pattern 22 has a circuit connecting portion 23 at its end. The circuit connecting portions 23 are arranged on both sides of the window hole 25 so as to overlap the circuit connecting portions 14 of the circuit board 10.

In FIG. 3, the connection fixing portion 21 of the flexible circuit board 20 has cutouts 29 formed at lower end portions on both left and right sides. When the connection fixing portion 21 is stacked on the circuit board 10, the circuit connecting portions 12 on both left and right sides of the circuit board 10 are exposed from the cutout portion 29. As shown in FIG. 5, the cross-sectional structure of the flexible circuit board 20, in particular, the connecting and fixing portion 21 thereof, has a flexible and insulating base 31, and a circuit connecting portion 23 formed on the base 31. And a circuit pattern following it, and an overlay 26 for insulating and protecting the circuit connecting portion 23 and the circuit pattern. A window hole 27 is formed in the overlay 26 in the vicinity of the circuit connecting portion 23 in order to connect a terminal portion of a circuit component described later to the circuit connecting portion 23 of the flexible circuit board 20 by soldering. Further, in order to connect and fix most of the terminal parts of the circuit component to the circuit connecting parts 12 and 14 of the circuit board 10 by soldering, as shown in FIGS. 1 and 5, the circuit connecting part 23 of the flexible circuit board 20 is connected. An oval cut portion 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 the present embodiment, it is a photodetection element in an optical pickup. In FIG. 4, the circuit component 35 has a quadrangular 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 part or the like.

As shown in FIGS. 1 and 5, the connection fixing portion 21 of the flexible circuit board 20 is superposed 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 stacked. Half of the main body of the circuit component 35 is dropped into 15 and the terminal portion 36 of the circuit component 35 is placed on the circuit connecting portion 23 of the flexible circuit board 20. The circuit connecting portions 12 and 14 of the circuit board 10, the circuit connecting portions 23 of the flexible circuit board 20 and the terminal portions 36 of the circuit component 35 are aligned and soldered. In the portion where the cutout portion 24 is formed on the flexible circuit board 20, the solder reaches the circuit connection portions 12 and 14 of the circuit board 10 through the cutout portion 24 and the circuit connection portions 12 and 14 of the circuit board 10 and the flexible circuit. Each circuit connecting portion 23 of the board 20 and each terminal portion 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. 5, reference numeral 32 indicates solder that integrally fixes the circuit board 10, the flexible circuit board 20, and the circuit component 35 as described above.

With the circuit board 10, the flexible circuit board 20, and the circuit component 35 fixed together as described above, the circuit connecting portion 12 of the circuit board 10 is cut out from the notches 29 on both the left and right sides of the flexible circuit board 20. Two are exposed side by side on each side. Therefore, a second circuit component, for example, a chip capacitor as shown by reference numeral 18 in FIG. 2 is soldered and connected between the two circuit connecting portions 12, 12 exposed on the left and right 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 connection portion 23 of the flexible circuit board 20 and the circuit pattern 22.

According to the embodiment described above, the circuit connecting portions 12 and 14 of the circuit board 10, the circuit connecting portion 23 of the flexible circuit board 20 and the terminal portion 36 of the circuit component 35 are set in substantially the same place. Since the flexible circuit board 20 is connected and fixed to the circuit board 10 by integrally soldering them together, the circuit board, the flexible circuit board and the circuit component can be connected by one soldering. At the same time, these can be fixed, and automation of soldering is easy.

Further, since the circuit pattern 11 and the circuit connecting portions 12 and 14 are formed also on the circuit board 10, and the circuit pattern 22 and the circuit connecting portion 23 of the flexible circuit board 20 are combined to form a predetermined circuit. The area of the circuit board 10 and the flexible circuit board 20 can be reduced as compared with the case where all the circuit patterns are concentrated on the flexible circuit board 20, and the circuit connecting portion of the circuit board 10 is also separately provided. Since the circuit components 18 can be connected, the area of the circuit board 10 and the flexible circuit board 20 can be reduced also from this point, and the space can be reduced.

Further, a cutout portion 24 is provided near 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. By soldering to the circuit connecting portion 23 of the flexible circuit board 20, the circuit connecting portions 12 and 14 of the circuit board 10, the circuit connecting portion 23 of the flexible circuit board 10 and the terminal portion 36 of the circuit component 35 are electrically connected. Since they are integrally soldered together, there is an advantage that the circuit board 10 and the flexible circuit board 20 are hard to peel off.

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

[0019]

[Effect of device]

 According to the invention as set forth in claim 1, 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 to each other, thereby making it flexible. Since the circuit board is connected and fixed to the circuit board, the circuit board, the flexible circuit board, and the circuit components can be connected and fixed by soldering once, and the soldering can be automated. It's easy. Furthermore, the circuit pattern and the circuit connection part are formed on the circuit board, and the circuit pattern and the circuit connection part of the flexible circuit board are combined to form a predetermined circuit, so that all circuit patterns are concentrated on the flexible circuit board. The area of the circuit board and the flexible circuit board can be made smaller than that in the case of being formed in this way, and the space can be reduced.

According to the second aspect of the present invention, the cutout portion is provided near the circuit connection portion of the flexible circuit board, the circuit connection portion of the circuit board is exposed from the cutout portion, and the terminal portion of the circuit component is flexible. By soldering to the circuit connection part of the circuit board, the circuit connection part of the circuit board, the circuit connection part of the flexible circuit board, and the terminal part of the circuit component are electrically and integrally soldered together. As compared with the case of connecting with bridge solder as described above, there is an advantage that the circuit board and the flexible circuit board are less likely to be separated.

According to the third aspect of the present invention, a cutout is formed in a part of the flexible circuit board, the circuit connecting portion of the circuit board is exposed from the cutout, and another circuit is connected to 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 also from this point.

[Brief description of drawings]

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

FIG. 2 is a front view of a circuit board according to the above embodiment.

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

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

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

FIG. 6 is a front view showing an outline of a flexible circuit board in the above embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 circuit board 11 circuit pattern 12 circuit connection part 18 different circuit component 20 flexible circuit board 22 circuit pattern 23 circuit connection part 24 cutout part 29 cutout part 32 solder 35 circuit part 36 terminal part

Claims (3)

[Scope of utility model registration request] 1. A flexible circuit comprising a circuit board having a circuit pattern having a circuit connecting portion formed on its surface and a circuit pattern having a circuit connecting portion connected to the circuit connecting portion of the circuit board on one surface. A circuit part having a terminal part connected to the circuit connecting part of the flexible circuit board; a circuit connecting part of the circuit board; a circuit connecting part of the flexible circuit board; and a terminal part of the circuit part. Is set in substantially the same place so that they are integrally connected by soldering, and the flexible circuit board is connected and fixed to the circuit board. 2. A cutout portion is provided in the vicinity of the circuit connection portion of the flexible circuit board, the circuit connection portion of the circuit board is exposed from the cutout portion, and the terminal portion of the circuit component is connected to the circuit of the flexible circuit board. 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 electrically and integrally soldered and connected by soldering to the connection portion. Item 2. A flexible board fixing mechanism according to Item 1. 3. A cutout is formed in a part of the flexible circuit board, and a circuit connecting portion of the circuit board is exposed from the cutout, and a terminal portion of another circuit component is exposed in the exposed circuit connecting portion. 2. A connection by soldering
A fixing mechanism for the flexible substrate described.