JP2003249738A - Printed wiring board, electronic component mounting structure and optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of easily mounting electronic components to a flexible printed wiring board, in which physical stress to the flexible printed wiring board can be alleviated in the fine adjustment of position and direction of the electronic components and flexible printed wiring board, and thermal stress for electronic components by the soldering can also be alleviated. <P>SOLUTION: Connection pieces (46, 47) having connection terminals, which are freely deflected when these are cut away with a slit, are provided on the printed wiring board (4). The electronic component 2 is provided with a projected portion (21) providing a connection terminal at the side portion thereof. A projected portion is provided through the printed wiring board in the manner as lifting the connection pieces. The lifted connection pieces are deflected sandwiching the projected portion for temporary fixing of electronic component. The end portions of the connecting pieces collide the connecting pieces of the projected portion with the side portion provided. The connection terminals of the connecting pieces and the connection terminals of the projected portion are connected with solder and the electronic component is mounted to the printed wiring board. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a printed circuit board mounted with a part of an electronic component penetrating, an electronic component mounting structure using this printed circuit board, and an electronic component mounting structure. Regarding optical pickup.

[0002]

2. Description of the Related Art Conventionally, in a mounting structure of an electronic component which is mounted on a flexible printed circuit board by penetrating a part of the electronic device, a hole provided on a side of the flexible printed circuit board with a connecting terminal of the electronic device is provided. There is a method in which the connection terminal provided on the edge of the hole and the connection terminal on the side surface of the protrusion are soldered by penetrating the portion. Also,
For example, Japanese Patent No. 3052071 and Japanese Patent No. 3108
746 and 47, Japanese Patent No. 3108747,
Japanese Patent No. 3052077 and Japanese Patent Laid-Open No. 2001-18
As disclosed in Japanese Patent No. 5831, there is a method of connecting an electronic component and a flexible printed circuit board by sandwiching them with a sandwiching member. In this way,
The flexible printed circuit board is bent from the back surface by a sandwiching member, and the flexible printed circuit board is fixed by the sandwiching member so that the folded portion holds the electronic component. Incidentally, the electronic component is provided with a connection terminal on the side surface, and since the connection terminal is also provided in a portion in contact with the connection terminal of the flexible printed board, by sandwiching by the sandwiching member, The flexible printed board and the electronic component are connected.

[0003]

However, in the mounting method of penetrating the flexible printed circuit board with the projecting portion having the above-mentioned connection terminal on the side surface, when the projecting portion is deeply penetrated, the flexible printed circuit board becomes an electronic component main body. When soldered, physical and thermal stress may be applied to the electronic component body. Therefore, in order to connect the connection terminal and the flexible printed circuit board at a position away from the electronic component body, it is necessary to fix the flexible printed circuit board at a middle portion of the connection terminal and solder it. Further, this fixing not only takes time and labor but also requires a dedicated jig. Further, if the position of the electronic component is finely adjusted in the XYZ direction and the rotation direction in such a fixed state, physical stress is applied to the flexible printed circuit board, which makes it difficult to finely adjust the position of the electronic component. is there. In addition, in the method using the sandwiching member, if the position of the electronic component is finely adjusted after the electronic component is mounted on the flexible printed circuit board, physical stress is applied to the electronic component,
When connecting, an extra component called a sandwiching member is required, and a tool for bending the sandwiching member is required. An object of the present invention is to reduce the physical stress on the connection portion between the flexible printed circuit board and the electronic component in the fine adjustment of the position and the orientation of the electronic component and the flexible printed circuit board as described above, and the thermal stress to the electronic component due to soldering The purpose is to reduce physical stress and easily mount electronic components on a flexible printed circuit board.

[0004]

In order to solve the above problems, the present invention provides a hologram diode having a light emitting element and a light receiving element for reading information from an optical information storage medium, and a wiring for the hologram diode. A printed circuit board connected to the hologram diode for performing
In an optical pickup including an optical system component that controls light emitted and received by the hologram diode, and a frame that supports the hologram diode and the optical system component, the hologram diode includes:
A protrusion provided with the first connection terminal on the side surface,
The printed circuit board includes a flexible printed circuit board on which printed wiring is formed, and a reinforcing layer that overlaps at least a part of the flexible printed circuit board to reinforce the flexible printed circuit board. An opening is formed through which the portion penetrates, and the flexible printed circuit board extends toward the first connection terminal of the projecting portion that penetrates through the opening provided in the reinforcing layer, and has a tip portion. A connection piece having a second connection terminal connected to the first connection terminal is provided, a flexible printed circuit board is arranged so as to overlap and cover the opening of the reinforcing layer, and the opening of the flexible printed circuit board is provided. A first portion along a side surface where the first connection terminal of the protruding portion that penetrates the opening is provided in a portion that overlaps the first portion. A slit is provided, a second slit is provided at both ends of the first slit along a direction intersecting with the first slit, and a portion surrounded by the first slit and the second slit is The connecting piece, the end of the second slit is curved, the second slit is formed longer than the width of the opening, and the base end of the connecting piece overlaps the reinforcing layer. Along with the reinforcing layer, the base end portion of the connecting piece can be brought into contact with and separated from the reinforcing layer, and the connecting piece is provided in two or more so as to sandwich the protruding portion from the left and right, and the reinforcing layer The projection of the hologram diode is passed through the opening of the projection, the tip of the connection piece is abutted on the side surface of the projection provided with the first connection terminal, and the connection piece is projected. In the direction that the part is penetrated In state I,
The second connection terminal at the tip of the connection piece and the first connection terminal at the protrusion are soldered.

According to the present invention, when the projecting portion is passed through the opening, the tip of the connecting piece abuts the side surface of the projecting portion on which the first connection terminal is provided, and
The first connection terminal and the second connection terminal are connected to each other in a state where the connection piece is bent in a direction in which the protrusion is penetrated. Therefore, even if the flexible printed circuit board is deeply penetrated and comes into contact with the main body of the electronic component that is the hologram diode, the tip of the connecting piece is the side surface of the projecting portion at a position away from the electronic component main body. Abut. That is, when soldering the first connection terminal and the second connection terminal, it is possible to reduce thermal and physical stress due to the soldering applied to the electronic component body. Further, since it is not necessary to fix the flexible printed circuit board in the middle of the projecting portion provided with the connection terminal, not only the labor for fixing it can be saved, but also
No special jig for fixing is required. Further, when the flexible printed circuit board is physically stressed, the physical stress is relieved by the bending of the connection piece. Therefore, the physical stress applied to the soldered portions of the first connection terminal and the second connection terminal can be reduced.

According to the present invention, second slits are provided at both ends of the first slit along a direction intersecting with the first slit, and the first slit and the second slit are provided. The portion surrounded by is the connection piece. Therefore, the connecting piece can be easily formed.

According to the present invention, the end portion of the second slit has a curved shape. Therefore, it is possible to disperse the physical stress applied to both ends of the second slit when the connecting piece is bent, and it is possible to prevent the flexible printed circuit board from cracking from the second slit.

Further, according to the invention, the second slit is formed longer than the width of the opening, and the base end portion of the connecting piece overlaps with the reinforcing layer and also overlaps with the reinforcing layer. The base end portion of is capable of coming into contact with and separating from the reinforcing layer. Therefore, when the projecting portion is penetrated through the flexible printed circuit board, when the connecting piece whose tip portion is in contact with the projecting portion bends, the state of being curved from the base end portion overlapping with the reinforcing layer of the connecting piece. It can be bent with. That is,
The bending at the base end portion of the connection piece can be made gentler than the right angle. As a result, it is possible to prevent the flexible printed circuit board from being bent or broken at a right angle so as to be cracked or broken.

Further, according to the present invention, two or more of the connecting pieces are provided so as to sandwich the protruding portion from the left and right. Therefore, since the electronic component is sandwiched between the flexible printed boards that are elastically deformed from the left and right while the protruding portion is inserted into the opening of the reinforcing layer, the electronic component should be temporarily fixed to the flexible printed circuit board. You can That is, at the time of soldering, it is not necessary to fix the electronic component by using a dedicated jig or the like so as not to shift. Further, since the second connecting terminal of the bent connecting piece and the first connecting terminal of the protruding portion of the electronic component are connected, the displacement when the position of the electronic component is finely adjusted in the XYZ direction and the rotation direction. Can be absorbed by the bent portion of the connecting piece. Therefore, it is possible to prevent physical stress from being applied to the connection between the terminals when the fine adjustment as described above is performed. Further, in the manufacture of an optical pickup using a hologram diode as an electronic component having a protrusion as described above, the hologram diode and the printed circuit board are connected like the above-mentioned electronic component and the printed circuit board. According to the above, the same effect as the above effect can be obtained. Further, in the optical pickup, after the hologram diode is connected to the support frame, it is necessary to finely adjust the position of the hologram diode in order to match the optical axis, the focus, etc. between the hologram diode and the optical system component. As described above, even if the hologram diode is finely adjusted, it is possible to prevent physical stress from being applied to the joint between the hologram diode and the printed board. Therefore, it is possible to provide a mounting structure of an electronic component suitable for an optical pickup.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. First, the configuration will be described. Figure 3
As shown in FIG. 1, the optical pickup 1 performs wiring to the electronic components 2 and 3 and the electronic components 2 and 3 which are hologram diodes including a light emitting element and a light receiving element for reading information from the optical information storage medium. Printed circuit boards 4 and 5 connected to the electronic components 2 and 3, respectively, an optical system component 6 for controlling the light emitted and received by the electronic components 2 and 3, the electronic components 2 and 3, and the optical system component. And a frame 7 for supporting 6. As shown in FIG. 2, the electronic component 2 is formed with a projecting portion 21 in which a connecting terminal 23 is provided on a side surface in a stripe shape, projecting from a case 22 that houses the main body of the electronic component 2. The electronic component 3 has the same shape as the electronic component 2.

The printed circuit board 4 is composed of a flexible printed circuit board 41 and a reinforcing layer 42. The flexible printed board 41 is made of synthetic resin film such as PE.
It is formed by printed wiring on the surface of a flexible sheet made of T or the like. 1 and 2, the flexible printed circuit board 41 is illustrated as a rectangular shape, but in reality, it is extended to at least one of the four sides and is connected to another printed circuit board, an electronic component, or the like. Further, the flexible printed board 41 is provided with a single linear slit 44 and two slits 45 at both ends of the slit 44 along a direction intersecting the slit 44 so as to be substantially orthogonal to the slit 44. ing.
Portions surrounded by the slits 44 and 45 of the flexible printed circuit board 41 and capable of bending from the base end are referred to as connection pieces 46 and 47. Also, the connection piece 4
Connection terminals 43 drawn from a wiring pattern (not shown) printed on the surface of the flexible printed board 41 are provided on the side portions formed by the slits 6 and 47. The connection terminals 43 are arranged so as to correspond to the connection terminals 23 of the protruding portions 21 of the electronic components 2 and 3.

The length of the slit 44 is equal to that of the electronic component 2.
It is formed to be substantially the same as or slightly longer than the side 21a of the side of the protruding portion 21 where the connection terminal 23 is provided. The shape of the slit 44 may be a notched shape having no width or a notched shape having a width. Slit 45
Has a length that is equal to the connecting end 23 of the protruding portion 21 of the electronic component 2.
It is formed to be longer than the side edge 21b of the side portion not provided with, and longer than the width along the side edge 21b of the opening 42a of the reinforcing layer 42 described later. Further, the shape of the slit 45 may be a notched shape having no width or a notched shape having a width. Further, both ends of the slit 45 are formed in a curved shape (a rounded shape). The end of the slit 45 is formed in a semicircular shape, for example. In addition, the slit 44 and the slit 4
The combined shape of 5 is, for example, an H shape.

The reinforcing layer 42 is formed by a member having a plate-like shape or a plurality of laminated films and having less bending than the flexible printed circuit board 41. Further, the protruding portion 21 of the electronic component 2 can penetrate the reinforcing layer 42, and the case 2
An opening 42a is formed so that 2 cannot penetrate therethrough. The opening 42a has a shape substantially similar to the outer periphery of the protrusion 21 and is slightly wider than the outer periphery of the protrusion.

Connection piece 4 of flexible printed board 41
The holes formed by bending 6 and 47 are
The flexible printed circuit board 41 is disposed on and bonded to the reinforcing layer 42 so as to substantially overlap the opening 42a of the reinforcing layer 42. That is, the slit 44 is arranged substantially at the center of the opening 42a. Further, at the time of bonding, the slit 45 has the opening 4 of the reinforcing layer 42 which overlaps with the slit 45.
Since the connecting pieces 46 and 47 are formed to be longer than the width of 2a, the connecting pieces 46 and 47 overlap the reinforcing layer 42 at their base end portions, but the base end portions of the connecting pieces 46 and 47 that overlap the reinforcing layer 42 overlap the reinforcing layer 42. The base end portions of the connecting pieces 46 and 47 are not adhered to the reinforcing layer 42 so that they can be contacted and separated from each other.

Next, the mounting structure of the electronic component 2 on the printed circuit board 4 will be described. The projecting portion 21 of the electronic component 2 is passed through the opening 42 a of the reinforcing layer 42. The opening 42a
As described above, the protrusion 21 can penetrate the case 2
Since 2 cannot penetrate, the penetrated reinforcing layer 42 stops at the step at the boundary between the protrusion 21 and the case 22.
When the flexible printed circuit board 42 is penetrated by the protrusion 21 together with the reinforcing layer 42, the connecting pieces 46 and 47 are pushed up by the protrusion 21. When the connecting pieces 46 and 47 are pushed up, the connecting pieces 46 and 47 are bent in the penetrating direction of the protrusion 21. Connecting pieces 46 and 47
The physical stress due to the bending of the slits concentrates on both ends of the slit 45. However, since the both ends have a curved shape, the physical stress can be dispersed, and the flexible printed circuit board 412 It is possible to prevent cracks from occurring at both ends.

Further, since the base end portions of the connecting pieces 46 and 47 can freely come into contact with and separate from the reinforcing layer 42, the connecting pieces 46 and 4 are connected.
7 can be bent from the base end and abut on the protrusion 21. Furthermore, as described above, the slit 45 is formed such that its length is longer than that of the side piece 21b of the projecting portion 21. Therefore, there is a margin between the base end portion, which is the position where the connecting pieces 46 and 47 start to bend, and the protruding portion 21, so that the bending angle of the connecting pieces 46 and 47 is gentler than the right angle. Therefore, it is possible to prevent the flexible printed circuit board 41 from being bent or bent at a right angle to cause cracks or breaks.

The tip ends of the pushed up connection pieces 46 and 47 come into contact with the side surface of the projecting portion 21 on which the connection terminal 23 is provided. Since the connecting pieces 46 and 47 are pushed up, the tip end portion is in a state of being lifted up from the flexible printed board 41. Therefore, the position where the tip portion comes into contact with the side surface of the protruding portion 21 is separated from the case 22 by the amount by which the tip portion is lifted. Also, the connection piece 4
The tips of 6 and 47 are straight sides formed by the slit 44. Therefore, the tip portion abuts the side surface of the protruding portion 21 along the entire linear side. Further, the connection terminals 43 are provided at the tip portions of the connection sides 46 and 47.
Is provided. Therefore, it is possible to connect the connection terminal 23 and the connection terminal 43 in a state in which the connection pieces 46 and 47 are bent in the direction in which the protrusion 21 penetrates.

Therefore, even if the projecting portion 21 penetrates deeply into the printed circuit board 4 and the flexible printed circuit board 41 contacts the case 22 in which the main body of the electronic component 2 is housed,
When connecting the connection terminal 23 and the connection terminal 43 by soldering, the thermal stress due to the soldering applied to the main body of the electronic component 2 is reduced. Further, since it is not necessary to fix the flexible substrate 41 in the middle of the protruding portion 21, not only the labor for fixing is saved, but also a dedicated jig for fixing is not required.

Further, when the projecting portion 21 penetrates the flexible printed circuit board 41, the connecting piece 46 and the connecting piece 47 contact the side surface of the projecting portion 21 so as to sandwich the projecting portion 21 from opposite sides. . In addition, the bent connecting pieces 46 and 47 are provided on the flexible printed circuit board 4.
The elastic force generated by the bending of No. 1 presses the protrusion 21. Therefore, the electronic component 2 is mounted on the printed circuit board 4,
It is in a state of being temporarily fixed by the connecting portions 46 and 47. That is, when soldering, it is not necessary to fix the electronic component 2 using a dedicated jig or the like so as not to shift it. Further, since the bent connecting pieces 46 and 47 can be easily deformed, the flexible printed circuit board 41 is not physically stressed and the electronic component 2 is temporarily fixed to the printed circuit board 4 without any physical stress. XY the position of the part 2
Fine adjustments can be made in the Z and rotation directions. That is, the electronic component 2 can be accurately positioned.

With the electronic component 2 temporarily fixed as described above, the first connecting terminal and the second connecting terminal are soldered to mount the electronic component 2 on the flexible substrate 4. Further, since the connecting pieces 46 and 47 are bent after mounting, when the flexible printed circuit board 41 is physically stressed, the physical stress is relieved by the bending of the connecting pieces 46 and 47. Therefore, the physical stress applied to the soldered portions of the first connection terminal and the second connection terminal can be reduced. The mounting structure of the hologram diode 3 on the flexible printed board 5 is the same as the mounting structure of the hologram diode 2 on the flexible printed board 4 described above.

[0021]

According to the present invention, even if the printed circuit board is not fixed so as not to contact the main body portion of the electronic component, the main body portion will not be adversely affected by thermal stress, and the connection terminal of the printed circuit board It can be soldered to the connection terminals of electronic parts. Further, the position and orientation of the electronic component can be finely adjusted without applying physical stress to the connecting portion between the printed circuit board and the electronic component, so that the electronic component can be accurately mounted on the printed circuit board. Furthermore, when mounting the electronic component, a dedicated jig for fixing the electronic component is not required, and the mounting can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a structure for mounting an electronic component on a printed circuit board according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of a structure for mounting the electronic component of FIG. 1 on a printed circuit board.

FIG. 3 is a front view showing an optical pickup to which the structure for mounting the electronic component of FIG. 1 on a printed circuit board is applied.

[Explanation of symbols]

1 Optical pickup 2, 3 Hologram diode (electronic component) 4,5 printed circuit board 6 Optical system parts 7 frames

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05K 3/34 505 H05K 3/34 505A F term (reference) 5D119 AA06 AA39 FA24 FA33 KA29 5D789 AA06 AA39 FA24 FA33 KA29 5E319 AA09 AB06 AC03 AC11 AC20 BB02 CC22 CD13 CD25 GG09 GG11 5E336 AA04 AA07 AA16 BB01 BB12 BB15 BC02 BC15 BC21 BC34 CC32 CC43 CC57 EE01 GG01 GG09 GG14 GG01 BB25 BB33 BB33 BB33 BB33 BB33

Claims (8)

[Claims] 1. A hologram diode having a light emitting element and a light receiving element for reading information from an optical information storage medium, a printed circuit board connected to the hologram diode for wiring the hologram diode, In an optical pickup including an optical system component that controls light emitted and received by a hologram diode, and a frame that supports the hologram diode and the optical system component, the hologram diode has a first connection terminal on a side surface. Is provided, the printed circuit board is provided with a flexible printed circuit board having a printed wiring, and a reinforcing layer that overlaps at least a part of the flexible printed circuit board to reinforce the flexible printed circuit board. The reinforcing layer is covered with the protrusion. An opening is formed, the flexible printed circuit board extends toward the first connection terminal of the protrusion that is penetrated through the opening provided in the reinforcing layer, and the flexible printed board has the first portion at the tip. A connection piece having a second connection terminal connected to one connection terminal is provided, a flexible printed circuit board is arranged so as to overlap and cover the opening of the reinforcing layer, and overlaps with the opening of the flexible printed circuit board. A first slit is provided in the portion along a side surface of the projecting portion through which the first connection terminal is provided, and the first slit is provided at both ends of the first slit. A second slit is provided along a direction intersecting with, and a portion surrounded by the first slit and the second slit is the connection piece, and an end portion of the second slit is It has a curved shape, the second slit is formed longer than the width of the opening, the base end of the connecting piece overlaps with the reinforcing layer, and the base end of the connecting piece overlaps with the reinforcing layer. Releasable to and from the reinforcing layer, the connection piece is provided two or more so as to sandwich the protrusion from the left and right, the protrusion of the hologram diode is penetrated through the opening of the reinforcing layer, The tip of the connecting piece is brought into contact with the side surface of the protruding portion on which the first connection terminal is provided, and the connecting piece is bent in a direction in which the protruding portion penetrates the connecting portion. An optical pickup in which a second connection terminal on the tip of the piece and a first connection terminal on the protrusion are soldered. 2. A flexible printed circuit board having printed wiring, and a reinforcing layer which is overlapped with at least a part of the flexible printed circuit board to reinforce the flexible printed circuit board, and a first connection terminal is provided on a side surface. An opening for penetrating the protrusion of an electronic component having the formed protrusion is provided in the reinforcing layer, and the flexible printed board has a first connection terminal of the protrusion in a state of being penetrated by the opening. In a printed circuit board provided with a second connection terminal connected to the flexible printed circuit board, the flexible printed circuit board extends toward the first connection terminal of the projecting portion penetrating the opening provided in the reinforcing layer. A connecting piece provided with the second connecting terminal is provided at the tip end portion while protruding, and when the protruding portion is passed through the opening, The first end of the connecting piece is in contact with a side surface of the protruding portion on which the first connection terminal is provided, and the connecting piece is bent in a direction in which the protruding portion is penetrated. A printed circuit board, wherein a connection terminal and the second connection terminal are connected. 3. The printed circuit board according to claim 2, wherein the flexible printed circuit board is arranged so as to overlap and cover the opening of the reinforcing layer, and the flexible printed circuit board is provided at a portion overlapping with the opening of the flexible printed circuit board. A first slit is provided along a side surface of the projecting portion through which the first connection terminal is provided, and both ends of the first slit are provided along a direction intersecting with the first slit. A second slit is provided, and a portion surrounded by the first slit and the second slit serves as the connecting piece. 4. The printed circuit board according to claim 3, wherein the end portion of the second slit has a curved shape. 5. The printed circuit board according to claim 3, wherein the second slit is formed longer than the width of the opening, and the base end of the connecting piece overlaps the reinforcing layer and the reinforcing layer. A printed circuit board, wherein a base end portion of the connection piece that overlaps with a layer can be brought into and out of contact with the reinforcing layer. 6. The printed circuit board according to any one of claims 2 to 5, wherein two or more connection pieces are provided so as to sandwich the protruding portion from the left and right. . 7. A mounting structure for an electronic component using the printed circuit board according to claim 2, wherein the protrusion of the electronic component is penetrated through the opening of the reinforcing layer, The tip of the connecting piece of the flexible printed circuit board is brought into contact with the side surface of the protruding portion on which the first connection terminal is provided, and the connecting piece is bent in the direction in which the protruding portion penetrates. In this state, the second connecting terminal at the tip of the connecting piece and the first connecting terminal at the protrusion are soldered to each other, and a mounting structure for an electronic component. 8. An optical pickup that uses the electronic component mounting structure according to claim 7, and is an optical pickup for reading information from an optical information storage medium, wherein the light emitting element and the light receiving element are for reading information from the optical information storage medium. And a hologram diode as the electronic component, the printed circuit board connected to the hologram diode for wiring the hologram diode, and an optical system for controlling light emitted and received by the hologram diode. A hologram and a frame that supports the hologram diode and the optical system component, the protrusion of the hologram diode is penetrated through the opening of the reinforcing layer, and the first connection terminal of the protrusion is provided. On the side surface, the tip of the connection piece of the flexible printed board is abutted, Note that the second connection terminal at the tip of the connection piece and the first connection terminal at the projection are soldered in a state in which the connection piece is bent in the direction in which the projection penetrates. Characteristic optical pickup.