JPS5913390A - Flexible both-side printed board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention (d1) relates to a flexible double-sided printed circuit board that is mounted on various electronic devices.

Generally, various electronic devices are equipped with a printed circuit board on which electrical components are mounted. Conventionally, rigid material boards such as paper phenol boards have been used as the above printed circuit boards, but as electronic devices become smaller, the space occupied by the printed circuit board inside the device body must also be taken into consideration. A need has arisen.

That is, when a large printed circuit board made of rigid material is attached to a small electronic device, it is necessary to divide the printed circuit board into a multilayer structure, for example. However, in the above structure, wiring between the divided printed circuit boards is required, and the installation structure is also complicated, making manufacturing difficult and requiring a large amount of cost.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a printed circuit board that can be compactly and easily incorporated into a small electronic device main body.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a printed circuit board according to the present invention will be described in detail below with reference to the drawings.

In the embodiment shown in FIGS. 1 to 5, a tuner unit 10 is attached to a cassette holder 51 of a player main body 500 instead of a tape cassette, so that a cassette player functioning as a radio receiver can be used. This is an application of the invention.

In this embodiment, the player body 50 includes a pinch roller 55 that guides the tape run onto a head board 54 that is moved in conjunction with button operations of a play button 52 and a stop/eject button 53, and a playback head for playing back the tape. 56 is provided, and a contact block 60 having a movable contact 61 for electrical connection with the tuner unit 10 is also provided. In addition, tuner unit 10
The component is housed in a unit housing 11 having approximately the same shape as a tape cassette (not shown) mounted on the player main body 50, and is located at a position facing the contact block 60 on the player main body 50 side. A contact block 15 for external connection is provided.

The tuner unit 10 has a built-in tuner circuit, and has the following structure. FIG. 2 is an exploded perspective view of the tuner unit 10. The tuner unit 10 is composed of a unit housing 11, a flexible double-sided printed circuit board 12, and a top cover 13. As shown in FIG. 3(A), the flexible double-sided printed circuit board 12 is made up of a flexible substrate 21, such as a polyimide board, and a circuit pattern 28 formed of copper foil or the like on both sides. Component parts 14 and tuning mechanism 16
is installed and conductive. Therefore, since the circuit pattern 8 is formed on both sides of the flexible substrate 27, various components 14 are arranged at high density on one side of the flexible double-sided printed circuit board 12, which enables complicated wiring. It becomes possible to do so.

Further, the flexible printed circuit board has two bent portions 25 and 26, and three component placement areas 22 and 23.
．． The above-mentioned parts arrangement areas 22, 23.2 are divided into 24 parts.
The circuit pattern 28 formed in 4 is the bent portion 25.26.
The connection circuit pattern 28A formed in FIG. The above connection circuit pattern 28A is shown in FIG. 3(B) K
As shown, the flexible substrate 27 is sandwiched between the flexible substrates 27 and they are disposed at positions that do not face each other.

That is, as shown in FIG. 3(A)K, in the connection circuit pattern 28A, a notch 28A is formed on the back surface of the connection circuit pattern 28A at a position facing the flexible substrate 27 between the two sides. Hole 29 has been opened.

Flexible double-sided print board 12 configured as described above
is bent at approximately right angles at the bending portions 25 and 26, and is bent into a U-shape so that the various components 14 face the inner side, as shown in FIG. 2, and is assembled into the unit housing 11. ing.

The connection circuit pattern 28A is difficult to bend when compared with the flexible substrate 27, and if the connection circuit patterns 28A are formed facing both sides of the flexible substrate 27, they will affect each other when bent. This causes excessive strain and makes wire breakage more likely. Therefore, in the bent portions 25 and 26, by providing the notch holes 29 so that the connecting circuit turns 28A are arranged at positions that do not face each other, the bent portions are made clear and the Flexible single-sided tape with a circuit pattern formed only on one side.

It is possible to obtain durability against bending equivalent to that of a lint board.

In addition, in the flexible double-sided printed circuit board 12, when the printed circuit board 12 is assembled into the outer casing, the one end 24A that contacts the mounting window 17 of the unit casing 11 has:
A contact block 15 is made of a double-sided printed circuit board in which a wiring pattern for internal connection and a contact pattern for external connection are formed on both sides of a rigid board such as a paper epoxy board, which are electrically connected through through holes, as shown in FIG. It is fixed so as to protrude inward at right angles in the above-mentioned bent state. The contact block 15 is electrically connected to the flexible double-sided printed circuit board 12 by soldering one end side (opposite the through-hole) of the wiring pattern for internal connection to a connection pattern (not shown) of the flexible double-sided printed circuit board 120. connected and mechanically fixed.

A flexible double-sided printed circuit board 12 configured as described above is assembled into a unit housing 11 and closed with an upper lid 13. Here, since the flexible double-sided printed circuit board 12 is made of a flexible material, it is pressed against the Schnitt housing 11 and the top lid 13 by elastic force, so that the assembly condition is very stable. 12V
It is possible to stably fix the flexible double-sided printed circuit board 12 by simply fixing the attached tuning mechanism section 16 to the unit housing 11 and the top lid 13VC with screws. Furthermore, since the upper cover 13 is made of a thin stainless steel plate, it has superior strength and can be made thinner. Furthermore, the above-mentioned thin stainless steel plate upper lid 13
The contact block 15, which is electrically and mechanically connected to the flexible double-sided printed circuit board 12 by soldering, is designed to serve as a grounding and shielding function for the housed electric circuit. As shown in FIG. 3, the unit is attached to the attachment window 17 of the unit housing 11 by fitting both ends into the attachment window 11 of the unit housing 11.

Further, in the player main body 50, the head substrate 54 on which the pinch roller 55, the playback head 56, the contact block 60, etc. are arranged is moved to the forward position as shown in FIG. 4 by pressing the play button 52. It is now in play mode. Here, the player main body 50 is set to the play mode by attaching a tape cassette (not shown) to the cassette holder 51Vc, and the capstan 51
A general magnetic reproducing operation is performed in which the tape is run by the pinch row 255 and a reproduced signal is obtained by the reproducing head 56.

Further, the player main body 50 is configured such that the tuner pack 10 having the above-described structure is attached to the cassette holder 51 and the fifth
As shown in the figure, by setting the play mode, the tuner unit 10 side and the player main body 50 side are electrically connected via each contact block 15, 60, and the player functions as a radio receiver.

In the embodiment with the above configuration, since the flexible double-sided printed circuit board 12 is used by being bent, it is possible to attach a printed circuit board with a large surface area to the tuner unit 10, which is a small electronic device. Since no extra wiring is required, the structure is simple and manufacturing costs can be reduced. Furthermore, the flexible double-sided printed circuit board 12 is easy to bend because the bending position is not obvious, and the bending portion 2
It is possible to prevent disconnection of the connection circuit pattern 28A in 5.26.

As is clear from the embodiments described above, in the present invention, in a flexible double-sided printed board in which circuits and circuits are formed on both sides of a flexible board, the first component arrangement is divided at the bending part. The region and the second component placement region are electrically connected through circuit patterns provided on both sides of the bent portion, and the circuit patterns of the bent portion are placed in positions where they do not face each other with the flexible substrate in between. Due to this feature, the flexible double-sided printed circuit board can be easily bent and incorporated into a small electronic device, and the internal structure of the electronic device can be simplified.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view showing an embodiment in which the present invention is applied to a tape player that functions as a radio receiver by installing a tuner unit. FIG. 2 is an exploded perspective view of the tuner unit. Figure 3 (A) is
This is a schematic longitudinal cross-sectional perspective view of the main parts of the flexible double-sided printed circuit board for explaining the structure of the flexible double-sided printed circuit board.
) is a schematic longitudinal cross-sectional perspective view of the main part taken along line A-A. Fourth
5 and 5 are schematic plan views of each main part showing the play mode state of the player main body in the above embodiment, FIG. 4 shows the state where no tape cassette or tuner unit is installed, and FIG. 5 shows the tuner unit. Shows the unit installed. 10... Tuner unit 11... Unit outer casing 12... Flexible double-sided printed circuit board 22, 23
．． 24...Component arrangement area 25.26...Bending portion 27...Flexible board 28...Circuit pattern 28
A... Connection circuit pattern 29... Notch hole patent applicant Sony Corporation representative Patent attorney Kodo Koike 1) Sakae Mura - 2nd
Figure 3rd (A) \ 2 (B)

Claims (1)

[Claims] In a flexible double-sided printed circuit board in which a circuit pattern is formed on both sides of a flexible substrate, a first component placement area and a second component placement area, which are divided by the bending part as a boundary, are provided on both sides of the bending part. What is claimed is: 1. A flexible double-sided printed circuit board, characterized in that the circuit patterns are electrically connected through the provided circuit patterns, and the circuit patterns of the bent portions are disposed at positions that do not face each other across the flexible substrate.