JP2014207330A - Flexible printed circuit board, circuit board unit, and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily switch on and off of short-circuit between a plurality of electrodes without using solder.SOLUTION: A flexible printed circuit board includes a main body part, a bent part, a first electrode provided on the bent part, and a second electrode provided on the main body part. The first electrode is provided on the same plane as the second electrode with the bent part being not bent. The first electrode and the second electrode are electrically connected to each other by the bent part being bent back on the opposite side of the surface on which the first electrode is provided.

Description

  The present invention relates to a board unit and an optical disk device including a flexible printed board.

  An optical disc apparatus that performs recording / reproduction with respect to an optical disc such as a BD (Blu-ray (registered trademark) Disc) or a DVD (Digital Versatile Disc) is provided with an optical pickup. Here, in order to prevent deterioration of the light source due to static electricity, the optical pickup needs to short-circuit the circuit pattern of the light source and the ground when the light source is not emitting light (during assembly or being transferred as a component). And in the state (an operation test, completion, etc.) which makes a light source light-emit, it is necessary to make it an open state.

  Therefore, conventionally, the land connected to the circuit pattern of the light source and the land connected to the ground are short-circuited by connecting them directly with solder or via lead wires. However, since it is necessary to repeatedly connect and disconnect the solder many times before the completion of the optical disk device, this method makes the soldering work complicated and the workability is deteriorated, and the land is deteriorated due to solder erosion. There was a thing.

  By the way, conventionally, various methods have been proposed for connecting electric circuits. For example, in patent document 1, the flexible circuit sheet is piled up on the surface of the flexible circuit sheet. Also, the folded piece connected to the flexible circuit sheet is folded back to the surface side of the flexible circuit sheet, and the end of the flexible circuit sheet is sandwiched between the flexible circuit sheet and the folded piece. . Then, from above the end of the wiring formed on the opposite side of the surface facing the flexible circuit sheet of both sides of the folded piece, the end of the wiring formed on the surface of the flexible circuit sheet Solder or conductive adhesive is deposited over the top. According to this, it is supposed that flexible circuit sheets can be efficiently joined.

  Further, in Patent Document 2, the folding wiring board base substrate includes a driving circuit mounting portion on which a driving circuit and a large number of wirings are mounted, and a wiring mounting on which wirings are mounted, with a bent portion where no wiring is formed as a boundary. It is divided into two blocks. The driving circuit and the wiring are not electrically connected before the folding-type wiring board base substrate is bent at the bending portion. By bending and adhering the folding type wiring board base substrate at the bending part, the driving circuit and the wiring are electrically connected, and the folding type wiring board is provided.

  According to this, in the manufacturing process, it is possible to shorten the process, reduce the cost, reduce the labor of parts management, and mount the driving circuit and wiring on a single substrate that enables space saving. It is said that a printed wiring board can be provided.

  Moreover, in patent document 3, the flexible circuit board is provided with the main board | substrate and the board | substrate for conduction | electrical_connection. A plurality of short lands for short-circuiting are formed on the main substrate. A wiring pattern for short-circuiting the plurality of short lands by being solder-connected to the plurality of short lands is formed on the conductive substrate. Moreover, the main board | substrate has a bending part bend | folded with the laminated | stacked board | substrate for conduction | electrical_connection. The plurality of short lands include a short land disposed in the vicinity of the bent portion.

  According to this, it is said that the storing operation can be made easier than before, and damage to the solder connection portion can be reduced more than before.

JP 2010-232317 A JP 2001-257436 A JP 2008-147462 A

  However, Patent Documents 1 to 3 do not describe what measures are effective when it is necessary to repeatedly turn on and off a short of a land during manufacture of an electrical device. In other words, there is no disclosure of countermeasures against repeated solder connection and disconnection many times, which complicates the soldering operation and reduces workability, or causes the land to deteriorate due to solder erosion.

  An object of the present invention is to provide a flexible printed circuit board, a circuit board unit, and an optical disk device that can easily switch on and off a short circuit between a plurality of electrodes without using solder.

  In order to achieve the above object, a flexible printed circuit board according to one aspect of the present invention includes a main body portion, a bent portion, a first electrode provided in the bent portion, and a second electrode provided in the main body portion. The first electrode is provided on the same surface as the second electrode portion in a state in which the bent portion is not bent, and the bent portion is bent back to the side opposite to the surface on which the first electrode is provided. The electrode and the second electrode are electrically connected.

  According to this configuration, the first electrode provided in the bent portion and the second electrode provided in the main body portion can be electrically connected by bending back the bent portion. Therefore, it is possible to easily switch on and off the short circuit between the plurality of electrodes without using solder.

  In the flexible printed board, the bent portion may be formed by making a cut in the flexible printed board. If it carries out like this, a bending part can be formed integrally with a flexible printed circuit board.

  Furthermore, in the flexible printed circuit board described above, the bent portion includes a first straight portion having one end connected to the main body portion, and a second straight portion connected to the other end of the first straight portion and orthogonal to the first straight portion. The first electrode may be provided at least on the second linear portion. If it carries out like this, a 2nd linear part can be inserted in the notch for forming a 1st linear part by bend | folding a bending part back to the opposite side to the surface in which a 1st electrode is provided. Therefore, by inserting the end of the second straight line portion into this notch, the bent portion can be temporarily fixed to the flexible printed board in a stable state, and the first and second electrodes can be short-circuited. .

  Further, in the above-mentioned flexible printed circuit board, an ear is extended at the tip of the bent part, a slit is formed in the flexible printed circuit board, and the bent part is bent back to the side opposite to the surface on which the first electrode is provided. The ear may be insertable into the slit. If it carries out like this, a bending part can be temporarily fixed to a flexible printed circuit board reliably in the more stable state.

  In the flexible printed board, a plurality of second electrodes may be provided. If it carries out like this, between a some 2nd electrode can be easily short-circuited via a 1st electrode by bend | folding a bending part and temporarily fixing.

  In the flexible printed board, the first electrode may be connected to the ground. In this way, the second electrode can be connected to the ground (that is, grounded).

  Further, a substrate unit according to one aspect of the present invention includes the above-described flexible printed circuit board and a reinforcing plate disposed on a surface opposite to the surface on which the second electrode of the flexible printed circuit board is provided, It has a slit into which a part of the bent portion is inserted.

  According to this configuration, the bent portion can be easily temporarily fixed to the reinforcing plate by inserting a part of the bent portion into the slit. Therefore, it can prevent that a bending part bends unintentionally and the 1st and 2nd electrode is electrically connected.

  An optical disc apparatus according to one aspect of the present invention includes the flexible printed board having a first electrode connected to a ground, and a light source that emits light irradiated to the optical disc, the light source being a second electrode. And electrically connected.

  According to this configuration, deterioration of the light source can be prevented by connecting each light source to the ground during the manufacturing process and transfer of the apparatus so that light is not emitted.

  According to the present invention, since the first and second electrodes can be electrically connected by bending back the bent portion of the flexible printed circuit board, it is easy to turn on and off a short circuit between a plurality of electrodes without using solder. Can be switched.

It is a block diagram which shows the structure of the optical disk apparatus of one Embodiment of this invention. It is the elements on larger scale of the flexible printed circuit board of one Embodiment of this invention. It is the elements on larger scale of the reinforcement board of one Embodiment of this invention. It is the elements on larger scale of the flexible printed circuit board unit of one Embodiment of this invention. It is the figure seen in the arrow B direction of FIG. It is a partial side view which shows one state of the flexible printed circuit board unit of one Embodiment of this invention. It is a partial side view which shows another one state of the flexible printed circuit board unit of one Embodiment of this invention. It is the elements on larger scale of the flexible printed circuit board of one Embodiment of this invention. It is the elements on larger scale of the flexible printed circuit board of one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, each embodiment can also be implemented combining in the possible range.

  FIG. 1 is a block diagram showing a configuration of an optical disc apparatus according to an embodiment of the present invention. The optical disc apparatus 1 can reproduce information on the optical disc 15 and record information on the optical disc 15. Reference numeral 2 denotes a spindle motor, and the optical disk 15 is detachably held by a chuck portion (turn table and clamper) provided on the upper portion of the spindle motor 2. Then, when recording / reproducing information on the optical disk 15, the spindle motor 2 continuously rotates the optical disk 15. The rotation control of the spindle motor 2 is performed by the spindle motor control unit 3.

  Reference numeral 4 denotes an optical pickup unit (OPU) that irradiates the optical disk 15 with a light beam emitted from a light source, thereby enabling writing of information on the optical disk 15 and reading of information recorded on the optical disk 15.

  The signal processing unit 8 includes at least an RF signal processing unit 9, a track error signal processing unit 10, and a focus error signal processing unit 11. In the signal processing unit 8, an RF signal, a track error signal (TE signal), and a focus error signal (FE signal) are generated based on the electrical signal converted by the photodetector (not shown). The RF signal is demodulated into data by the data demodulator 12.

  The TE signal and the FE signal are output to the actuator control unit 7. Based on these signals, the actuator controller 7 supplies a drive signal to an actuator (not shown) that can move the objective lens. The actuator to which the drive signal is supplied operates each part based on the signal to perform focus control and tracking control. In the focus control, the objective lens is moved in a direction parallel to the optical axis so that the focus follows the recording surface of the optical disc 15. In tracking control, the objective lens is moved in a direction parallel to the radial direction of the optical disk 15 so that the spot position of the light beam follows the track position formed on the optical disk 15.

  In addition, the laser control unit 5 controls the laser output of a light source (not shown) composed of a semiconductor laser provided in the OPU 4. The overall control unit 13 controls the spindle motor control unit 3, the laser control unit 5, the beam expander control unit 6, the actuator control unit 7, the signal processing unit 8, the data demodulation unit 12, and the like to control the entire apparatus. Take control.

  Further, in order to prevent the light source from being deteriorated due to static electricity, the OPU 4 needs to short-circuit the circuit pattern of the light source and the ground in a state where the light source does not emit light (during assembly or transfer as a part). And in the state (an operation test, completion, etc.) which makes a light source light-emit, it is necessary to make it an open state.

  Therefore, a flexible printed circuit board having a short land electrically connected to the circuit pattern of the light source and a shorting land electrically connected to the ground, and a reinforcing plate are used. Then, several times until the completion of the optical disc apparatus 1 are performed, the solder is switched on and off without using solder. In this way, for example, when the optical disk apparatus 1 is manufactured and transferred, each light source is connected to the ground so that light is not emitted, thereby preventing the light source from deteriorating.

  Below, a flexible printed circuit board and a reinforcement board are demonstrated in detail. FIG. 2 is a partially enlarged view of the flexible printed circuit board according to the embodiment of the present invention. Moreover, FIG. 3 is the elements on larger scale of the reinforcement board of one Embodiment of this invention. FIG. 4 is a partially enlarged view of the flexible printed circuit board unit according to the embodiment of the present invention. FIG. 5 is a view seen in the direction of arrow B in FIG. FIG. 6 is a partial side view showing one state of the flexible printed circuit board unit according to the embodiment of the present invention. FIG. 7 is a partial side view showing another state of the flexible printed circuit board unit according to the embodiment of the present invention. 6 and 7 show a state in which the flexible printed circuit board is deformed in the cross-sectional view taken along the line AA in FIG.

  The flexible printed circuit board unit 40 includes a flexible printed circuit board (hereinafter sometimes referred to as FPC) 20 and a reinforcing plate 30. The FPC 20 and the reinforcing plate 30 are fixed with an adhesive or the like.

  The FPC 20 is a printed circuit board that is flexible and can be greatly deformed. The FPC board 20 has a structure in which an adhesive layer is formed on a film-like insulator (base film), and further a conductor foil of about several tens of μm is formed thereon, and is insulated except for lands (terminal portions). The body is covered and protected. As shown in FIG. 2, the FPC 20 includes a main body portion 20 a, a short-circuit land 21, two short lands 22, and a bendable bending portion 23. The shorting land 21 is provided in the bent portion 23, and the two short lands 22 are provided in the main body portion 20 a of the FPC 20. Further, the short-circuit land 21 is provided on the same surface (one main surface of the FPC 20) as the two short lands 22 in a state where the bent portion 23 is not bent.

  The short-circuit land 21 has a size capable of short-circuiting the two short lands 22 and is connected to the ground. That is, the shorting land 21 is grounded. In FIG. 2, the shorting land 21 is a T-shaped first electrode pattern including the first and second shorting land portions 21a and 21b. The second short-circuit land portion 21b is connected to one end of the first short-circuit land portion 21a and is orthogonal to the first short-circuit land portion 21a.

  The short land 22 is a second electrode pattern that is electrically connected to the light source of the OPU 4. Each short land 22 is connected to one light source. That is, there are as many short lands 22 as the number of light sources. When the shorting lands 21 are electrically connected to the short lands 22, the short lands 22 are short-circuited via the shorting lands 21. The short lands 22 are provided one by one on both sides of one end of the first straight portion 23a with a cut portion therebetween. In addition, the short land 22 is provided below the second linear portion 23b in FIG. In FIG. 2, the short land 22 is square, but there is no problem even if it has other shapes.

  The bent portion 23 is formed by cutting the FPC 20, and includes the first and second straight portions 23a and 23b. One end of the first straight portion 23a is connected to the main body portion 20a of the FPC 20 without being cut off. The second straight portion 23b is connected to the other end of the first straight portion 23a and is orthogonal to the first straight portion 23a. Therefore, the bent part 23 is T-shaped. In addition, a first short-circuit land portion 21a of the short-circuit land 21 is formed on the first straight portion 23a, and a second short-circuit land portion 21b is formed on the second straight portion 23b. The bent portion 23 in which the short-circuit land 21 is formed is separated from the main body portion 20a of the FPC 20 except for a portion near the short land 22 (a portion near one end of the first straight portion 23a). Specifically, the film portion around the bent portion 23 is cut off.

  The reinforcing plate 30 is a flat plate made of resin or the like, and for example, a rigid substrate can be used. The reinforcing plate 30 is disposed on the surface opposite to the surface on which the shorting land 21 and the short land 22 of the FPC 20 are provided. As shown in FIG. 3, the reinforcing plate 30 has two slits 31 into which the both ends of the second straight portion 23 b can be inserted in the portion overlapping the short-circuit land 21. That is, the slit 31 is formed in a direction orthogonal to the second linear portion 23b.

  As shown in FIG. 4, the short-circuit land 21 can be temporarily fixed easily by inserting both ends of the second linear portion 23 b into the slit 31. By temporarily fixing in this way, it is possible to prevent the portion where the short-circuit land 21 is formed from being unintentionally bent and short-circuited with the short land 22.

  In FIG. 3, two slits 31 are formed in the reinforcing plate 30. However, the reinforcing plate 30 has a slit 31 into which a part of the bent portion 23 can be inserted in a portion overlapping the bent portion 23. Good. That is, the number of slits 31 may be one or more.

  Next, a procedure for short-circuiting the shorting land 21 and the short land 22 will be described. First, as shown in FIG. 6, the bent portion 23 on which the short-circuit land 21 is formed is raised, and the bent portion 23 is bent back (almost 180 °) to the side opposite to the surface on which the short-circuit land 21 is provided. By doing so, as shown in FIG. 7, both ends of the second short-circuit land 21b and the two short lands 22 are short-circuited (electrically connected). In addition, the short lands 22 can be easily short-circuited via the short-circuit lands 21 without using solder. Furthermore, each short land 22 can be connected to the ground (that is, grounded).

  In the state of FIG. 7, since the tip of the bent back part is only sandwiched between the FPCs 20, the state of FIG. 6 can be easily returned to the state of FIG. On the other hand, the state of FIG. 7 does not naturally return to the state of FIG.

  As described above, according to the above configuration, it is possible to easily switch the short-circuit land 21 and the short land 22 on and off without using solder several times before the optical disc device 1 is completed.

  In FIG. 2, two short lands 22 are provided, but the present invention is not limited to this, and at least one short land 22 may be used. Further, although the short-circuit land 21 is T-shaped in FIG. 2, it is not limited to this, and may be L-shaped or straight, for example. Further, although the short-circuit land 21 is formed at the end portion of the FPC 20 in FIG. 2, it is not necessarily required to be the end portion. Moreover, although the slit 31 is formed in the edge part of the reinforcement board 30 in FIG. 3, it does not necessarily need to be an edge part.

  Below, other embodiment of a flexible printed circuit board unit is described. FIG. 8 is a partially enlarged view of the flexible printed circuit board according to the embodiment of the present invention. The reinforcing plate shown in FIG. 3 can be used.

  As shown in FIG. 8, the FPC 20 ′ is cut so that a part of the substrate portion located near the right end portion of the second straight portion 23 b of the bent portion 23 protrudes to the right as the ear portion 24. . In the main body portion 20 a ′ of the FPC 20 ′, a slit 25 into which the ear portion 24 can be inserted is formed further below the short land 22 below the ear portion 24.

  Thus, when the state is the same as that in FIG. 7, the FPC 20 ′ can be folded and fixed stably by inserting the ear 24 into the slit 25. In addition, if the set of the ear | edge part 24 and the slit 25 is added to the left side of the land 21 for a short circuit, it can fix temporarily more reliably.

  FIG. 9 is a partially enlarged view of the flexible printed circuit board according to the embodiment of the present invention. The reinforcing plate shown in FIG. 3 can be used.

  As shown in FIG. 9, a part of the substrate portion located in the vicinity of both end portions of the second straight portion 23 b of the bent portion 23 protrudes upward as the ear portion 26. Accordingly, when the same state as that shown in FIG. 7 is obtained, the respective ear portions 26 are in close contact with each other along the FPC 20 ″, so that the FPC 20 ″ can be stably temporarily fixed in a folded state. In addition, if the slit which can insert the ear | edge part 26 is provided in the lower part of the short land 22 in the main-body part 20a "of FPC20", it can fix temporarily more reliably.

  The embodiment of the present invention has been described above. According to each embodiment mentioned above, FPC20 is provided with main part 20a, bent part 23, short circuit land 21 provided in bent part 23, and short land 22 provided in main part 20a. The short-circuit land 21 is provided on the same surface as the short land 22 in a state where the bent portion 23 is not bent. The bent portion 23 is bent back on the side opposite to the surface on which the short-circuit land 21 is provided, whereby the short-circuit land 21 and the short land 22 are electrically connected.

  According to this configuration, by bending back the bent portion 23, the short-circuit land 21 provided in the bent portion 23 and the short land 22 provided in the main body portion 20a can be electrically connected. Therefore, it is possible to easily switch on and off the short circuit between the plurality of lands without using solder.

  In the FPC 20 described above, the bent portion 23 is formed by cutting the FPC 20. In this way, the bent portion 23 can be formed integrally with the FPC 20.

  Further, the bent portion 23 includes a first straight portion 23a whose one end is connected to the main body portion 20a, and a second straight portion 23b which is connected to the other end of the first straight portion 23a and is orthogonal to the first straight portion 23a. Further, the short-circuit land 21 is provided at least in the second straight portion. In this case, the second straight portion 23b can be inserted into the cut for forming the first straight portion 23a by bending the bent portion 23 back to the side opposite to the surface on which the shorting land 21 is provided. Therefore, by inserting the end portion of the second straight portion 23b into this cut, the bent portion 23 can be temporarily fixed to the FPC 20 easily in a stable state.

  Further, in the above FPC 20 'or 20 ", an ear 24 or 26 is extended at the tip of the bent portion 23, and a slit 25 is formed in the FPC 20' or 20". Further, when the bent portion 23 is bent back to the side opposite to the surface on which the shorting land 21 is provided, the ear portion 24 or 26 can be inserted into the slit 31. In this way, the bent portion 23 can be temporarily fixed to the FPC 20 'or 20 "in a more stable state.

  In the FPC 20 described above, there are a plurality of short lands 22. In this case, the plurality of short lands 22 can be easily short-circuited via the short-circuit lands 21 by bending and temporarily fixing the bent portion 23.

  In the FPC 20, the short-circuit land 21 is connected to the ground. In this way, the short land 22 can be connected to the ground (that is, grounded).

  Moreover, according to each embodiment mentioned above, the flexible printed circuit board unit 40 is provided with said FPC20 and the reinforcement board 30 arrange | positioned on the surface opposite to the surface in which the short land 22 of FPC20 is provided. The reinforcing plate 30 has a slit 31 into which a part of the bent portion 23 is inserted. In this way, by inserting a part of the bent portion 23 into the slit 31, the bent portion 23 can be easily temporarily fixed to the reinforcing plate 30. Therefore, it is possible to prevent the shorted land 21 and the short land 22 from being electrically connected by bending the bending portion 23 unintentionally.

  Moreover, according to each embodiment mentioned above, the optical disk apparatus 1 is provided with said FPC20 by which the land 21 for a short circuit is connected to the ground, and the light source which radiate | emits the light irradiated to the optical disk 15. FIG. The light source is electrically connected to the short land 22. By doing so, it is possible to prevent deterioration of the light source by connecting each light source to the ground during the manufacturing process and transfer of the optical disc device 1 so that no light is emitted.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for an electrical apparatus, in particular, a playback apparatus that plays back an optical disk such as a BD, a DVD, and a CD (Compact Disc) and a recording / playback apparatus that can also record on the optical disk. . Examples thereof include a BD / DVD player, a BD / DVD recorder, a TV-integrated BD / DVD recorder, and a personal computer equipped with a BD / DVD recording / reproducing apparatus.

1 Optical disk device 20 Flexible printed circuit board (FPC)
20a body portion 21 short-circuit land 21a first short-circuit land portion 21b second short-circuit land portion 22 short land 23 bent portion 23a first straight portion 23b second straight portion 24, 26 ear portion 25 slit 30 reinforcing plate 31 slit 40 Flexible printed circuit board unit

Claims (8)

A main body portion, a bent portion, a first electrode provided in the bent portion, and a second electrode provided in the main body portion,
The first electrode is provided on the same surface as the second electrode portion in a state where the bent portion is not bent,
A flexible printed circuit board, wherein the first electrode and the second electrode are electrically connected by bending the bent portion on the opposite side to the surface on which the first electrode is provided.   The flexible printed circuit board according to claim 1, wherein the bent portion is formed by making a cut in the flexible printed circuit board. The bent portion includes a first straight portion having one end connected to the main body portion, and a second straight portion connected to the other end of the first straight portion and orthogonal to the first straight portion,
The flexible printed circuit board according to claim 2, wherein the first electrode is provided at least on the second linear portion. An ear is extended at the tip of the bent portion, and a slit is formed in the flexible printed circuit board.
The said ear | edge part can be inserted in the said slit, when the said bending part is bent back on the opposite side to the surface in which a said 1st electrode is provided, The Claim 1 characterized by the above-mentioned. Flexible printed circuit board.   The flexible printed circuit board according to claim 1, wherein a plurality of the second electrodes are provided.   The flexible printed circuit board according to claim 1, wherein the first electrode is connected to a ground. The flexible printed board according to any one of claims 1 to 6,
A reinforcing plate disposed on a surface opposite to a surface on which the second electrode of the flexible printed board is provided,
The reinforcing plate has a slit into which a part of the bent portion is inserted. The flexible printed circuit board according to claim 6,
A light source that emits light irradiated to the optical disc,
The optical disk device, wherein the light source is electrically connected to the second electrode.

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