JP3765541B2 - Optical pickup device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical pickup device in an apparatus for recording and / or reproducing information on an optical recording medium such as a CD, DVD, or MD as a recording medium, and in particular, a power supply terminal of a laser element provided in an optical system block and an optical system block The present invention relates to a flexible wiring board for connecting to a printed circuit board provided on the board.
[0002]
[Prior art]
An optical pickup device that constitutes an optical disk device includes a laser element as a laser source in an optical system block (see, for example, Patent Document 1), and the laser element includes a power supply circuit provided on a printed circuit board provided in the optical system block. Is connected.
[0003]
[Patent Document 1]
JP, 2002-140828, A As a structure which connects a laser element to such a power circuit, there is a thing of the structure shown in Drawing 9 and Drawing 10 conventionally. This is made of a metal foil in a resin sheet in order to connect the power supply terminal 4 of the laser element 3 provided in the optical system block 1 to the laser power supply circuit of the printed circuit board 2 attached so as to overlap the optical system block 1. A flexible wiring board (FPC) 5 provided with wiring is used.
[0004]
[Problems to be solved by the invention]
As shown in FIGS. 9 and 10, in the conventional optical pickup device using the flexible wiring board 5, a pad 6 having a hole corresponding to the power supply terminal 4 of the laser element 3 is provided on the flexible wiring board 5. As shown by the two-dot chain line, the hole provided in the pad 6 of the flexible wiring board 5 is fitted to the power supply terminal 4 of the laser element 3, and as shown by the arrow X, the root of the power supply terminal 4 of the laser element is fitted. The connection is made by sliding the joint part and soldering.
[0005]
However, since the power supply terminal 4 of the laser element 3 is connected to the power supply of the test apparatus before being connected to the flexible wiring board 5 in order to test the performance of the optical pickup apparatus, a predetermined length is required. For this reason, in order to fit the hole of the pad 6 to the power supply terminal 4, in order for the hole of the pad 6 of a flexible wiring board to reach the front-end | tip of the power supply terminal 4 (4a is a dummy terminal), The length of the flexible wiring board 5 needs to be longer than the final attached state.
[0006]
For this reason, in the state where the pad 6 is finally soldered to the power supply terminal 4 of the laser element, a slack portion 5 a is generated in the flexible wiring board 5. Such a slack portion 5a guides the optical system block 1 so as to be movable in the radial direction of an optical disk (not shown), for example (8 is provided on the optical system block 1 and slides on the guide shaft 7). It is a sliding part that is freely fitted).
[0007]
In view of the above problems, the present invention provides an optical pickup device having a structure capable of preventing sagging of a flexible wiring board when a laser power terminal provided in an optical system block and a printed board are connected by a flexible wiring board. The purpose is to do.
[0008]
[Means for Solving the Problems]
(1) The optical pickup device of the present invention includes an optical system block provided movably along a guide shaft provided in the optical recording and / or reproducing device,
The connection between the printed circuit board provided in the optical system block and the power supply terminal of the laser element protruding on the outer peripheral surface of the optical system block is performed by a bent flexible wiring board,
The connection portion of the flexible wiring board with the power supply terminal of the laser element has a structure in which a pad is provided in a recess provided in a cut shape from an edge of the flexible wiring board, and the pad is connected to the power supply terminal of the laser element. It is characterized by that.
[0009]
(2) Moreover, the optical pick-up apparatus of this invention is the optical pick-up apparatus as described in said (1),
A pad is provided on each of two opposing sides of the recess provided in the flexible wiring board,
The power source terminals of two laser elements are sandwiched between pads provided on these two sides.
[0010]
(3) Moreover, the optical pick-up apparatus of this invention is the optical pick-up apparatus as described in said (1) or (2),
The flexible wiring board has an L-shaped portion extending outward from the printed board,
The flexible wiring board has an L-shaped portion extending outward from the printed board,
A concave portion having the pad is formed in an edge portion of the connection portion of the flexible wiring board facing the printed circuit board.
[0011]
(4) Moreover, the optical pickup device of the present invention is the optical pickup device according to any one of (1) to (3),
A reinforcing plate is fixed to a connection portion between the flexible wiring board and the power supply terminal of the laser element.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing an embodiment of an optical pickup device according to the present invention. Reference numeral 1 denotes an optical system block incorporating an optical system device such as a laser element. As shown in FIGS. 2 and 3, a printed circuit board 2 on which an IC 9 or the like is mounted overlaps the optical system block 1. It is provided as follows. Reference numeral 3 denotes a laser element built in the optical system block 1, and 4 denotes a power supply terminal thereof. The power supply terminal 4 of the laser element protrudes outward from the outer surface of the optical system block 1. Reference numeral 20 denotes a heat radiating plate of the IC 9, and 21 denotes a connector for connecting the circuit of the main part of the optical recording and / or reproducing apparatus to the printed board 2.
[0013]
Reference numeral 8 denotes a sliding portion that guides a guide shaft (sub shaft) 7 that guides the optical system block 1 in a movable manner. Reference numeral 10 denotes a sliding portion that is slidably fitted to a guide shaft that is a main shaft (not shown). Reference numeral 11 denotes an objective lens driving device mounted on the optical system block 1, and 12 denotes an objective lens that is movably provided at least in a focus direction and a tracking direction with respect to a fixed portion of the objective lens driving device 11.
[0014]
A flexible wiring board 13 connects the power supply terminal 4 of the laser element 3 and the printed board 2 provided in the optical system block 1. Reference numeral 14 denotes a flexible wiring board connected to a power supply terminal 15 of another laser element (not shown) provided in the optical system block 1. For example, one of the laser element 3 and another laser element (not shown) is provided for DVD and the other is for CD.
[0015]
The flexible wiring boards 13 and 14 are integrally formed and connected to the printed circuit board 2. The illustrated flexible wiring boards 13 and 14 are portions extending from the printed circuit board 2 to the outside. These flexible wiring boards 13 and 14 are overlapped and fixed on the printed circuit board 2, and wiring made of an internal metal foil is connected to the wiring of the printed circuit board 2. These flexible wiring boards 13 and 14 may be configured separately.
[0016]
The flexible wiring board 13 of the present embodiment has an L shape including an arm portion 13a that extends substantially from the printed circuit board 2 and a connection portion 13b that is bent from the arm portion 13a. The pad 16 of the flexible wiring board 13 has a structure provided on two opposing sides of a recess 13d provided in a cut shape from the edge 13c of the printed circuit board 2 of the connection portion 13b of the flexible wiring board 13.
[0017]
4 a is a dummy terminal of the laser element 3. Thus, in this example, since it has the dummy terminal 4a, the connection part 13a with the power supply terminal 4 of the flexible wiring board 13 has shown the thing which formed the recessed part 13e also in the part of the dummy terminal 4a. These pads 16 and 16 are applied to the power supply terminal 4 and connected by soldering or conductive adhesive.
[0018]
As shown in FIG. 5, the flexible wiring board 13 is connected to the power supply terminal 4 from the twisted state of the arm portion 13a as shown by an arrow R to return the connection portion 13b to the power supply terminal 4 side. As shown in FIG. 2, the two power terminals 4, 4 are sandwiched between the pads 16, 16 of the recess 13e and soldered.
[0019]
Thus, by providing the notch-shaped recess 13d in the edge portion 13c and providing the pad 16 in the recess, the connection portion 13b is brought close to the side surface side of the power supply terminal 4 to connect the pad 16 to the power supply terminal 4. Can do. For this reason, as shown in FIG. 3, the flexible wiring board 13 can be attached with almost no slack portion, and interference with the guide shaft 7 can be avoided.
[0020]
When practicing the present invention, when applied to a laser element without the dummy terminal 4a, or when the dummy terminal 4a is provided in the upper part of FIG. Pads may be provided in the recesses, but as in the present embodiment, pads 16 are provided on two opposing sides of the recesses 13d provided in the flexible wiring board 13, and the pads 16, By adopting a structure in which the power supply terminals 4 and 4 are sandwiched between 16, the pad 16 can be temporarily fixed to the power supply terminal 4, and the workability in connecting the pad 16 to the power supply terminal 4 is improved.
[0021]
In addition, the flexible wiring board 13 is formed in a substantially L shape, and the connecting portion 13b of the flexible wiring board 13 is attached to the power supply terminal 4 from the opposite side of the printed circuit board 2 to twist the arm portion 13a. Can be easily secured, and the connection work is facilitated.
[0022]
6 to 8 show another embodiment of the present invention, in which a reinforcing plate 17 is fixed to the connection portion 13b of the flexible wiring board 13 and the connection portion 14a of the flexible wiring board 14. FIG. As the reinforcing plate 17, it is preferable to use a glass epoxy resin plate from the viewpoint of heat resistance, adhesiveness, and cost, but other materials may be used as long as they have the above characteristics.
[0023]
If such a reinforcing plate 17 is provided, the connecting portions 13b and 14a can be flattened and the strength can be improved, and handling and soldering workability can be improved. Further, in the flexible wiring board 13, the reinforcing plate 17 extends not only to the connecting portion 13b but also to the corner portion 13f between the connecting portion 13b and the arm portion 13a, thereby guiding the corner portion 13f. Deflection and sagging toward the shaft 7 can also be prevented well.
[0024]
In the above embodiment, the flexible wiring board 14 connected to the power supply terminal 15 of the laser element (not shown) does not cause a problem of interference with the guide shaft 7, and thus adopts a conventional perforated pad structure. However, this flexible wiring board 14 may also have a structure in which a pad is provided in a cut-out recess.
[0025]
【The invention's effect】
According to the present invention, the connection portion between the flexible wiring board and the power supply terminal of the laser element has a structure in which the pad is provided in the recess provided in a cut shape from the edge of the flexible wiring board, and the pad is used as the power supply of the laser element. Since it is connected to the terminal, the flexible wiring board can be attached to the optical system block without causing slack, and interference with the guide shaft or the like can be avoided. Further, since the slack of the flexible wiring board is eliminated, the appearance is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of an optical system block according to the present invention.
FIG. 2 is a side view showing a mounting structure of a flexible wiring board in the present embodiment.
3 is a cross-sectional view showing a mounting structure of the flexible wiring board of FIG. 2;
FIG. 4 is a side view showing a connection portion with a power supply terminal of the flexible wiring board of the present embodiment.
FIG. 5 is a side view illustrating a mounting operation of the flexible wiring board according to the present embodiment.
FIG. 6 is a perspective view showing another embodiment of the optical system block according to the present invention.
7 is a side view showing a flexible wiring board mounting structure in the embodiment of FIG. 6; FIG.
8 is a cross-sectional view showing a mounting structure of the flexible wiring board shown in FIGS. 6 and 7. FIG.
FIG. 9 is a side view showing a conventional flexible wiring board mounting structure.
10 is a cross-sectional view showing a mounting structure of the flexible wiring board of FIG. 9;
[Explanation of symbols]
1: optical system block, 2: printed circuit board, 3: laser element, 4: power supply terminal, 4a: dummy terminal, 8, 10: guide shaft sliding portion, 9: IC, 11: objective lens driving device, 12: objective Lens, 13, 14: Flexible wiring board, 13a: Arm part, 13b: Connection part, 13c: Edge part, 13d: Concave part, 13e: Concave part, 15: Power supply terminal, 16: Pad, 17: Reinforcement board, 20: Heat dissipation Board, 21: Connector

Claims (4)

An optical system block provided movably along a guide shaft provided in the optical recording and / or reproducing apparatus;
The connection between the printed circuit board provided in the optical system block and the power supply terminal of the laser element protruding from the outer peripheral surface of the optical system block is performed by a bent flexible wiring board,
The connection portion between the flexible wiring board and the power supply terminal of the laser element has a structure in which a pad is provided in a recess provided in a cut shape from an edge of the flexible wiring board, and the pad is connected to the power supply terminal of the laser element. An optical pickup device characterized by that. The optical pickup device according to claim 1,
A pad is provided on each of two opposing sides of the recess provided in the flexible wiring board,
An optical pickup device having a structure in which power supply terminals of two laser elements are sandwiched between pads provided on these two sides. The optical pickup device according to claim 1 or 2,
The flexible wiring board has an L-shaped portion extending outward from the printed board,
An optical pickup device, wherein a concave portion having the pad is formed at an edge portion of the connecting portion of the flexible wiring board facing the printed circuit board. In the optical pick-up apparatus in any one of Claim 1 to 3,
An optical pickup device, wherein a reinforcing plate is fixed to a connection portion between the flexible wiring board and a power supply terminal of a laser element.

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