JP2854792B2 - Optical pickup device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device for recording a signal on a disk or reproducing a signal on the disk, and more particularly to a method of positioning a printed circuit board by terminals of a laser unit.

[0002]

2. Description of the Related Art Conventionally, a laser unit including a semiconductor laser for emitting a laser beam for recording or reproducing a signal, a light receiving element, and an optical system component (diffraction grating, hologram, etc.) is provided. There has been proposed an optical pickup device having a configuration in which a printed circuit board is positioned by utilizing the same.

One example will be described with reference to FIG. 3. A laser unit 1 includes, for example, a high-power semiconductor laser.
A high-power hologram laser unit using a hologram, having a large number of terminals 2 on the back surface thereof, a printed circuit board 3 being a circuit board for high-frequency oscillation, and all terminals 2 being inserted in the center thereof. The opening 4 is formed so that the shape of the opening 4 is changed so that the periphery of each opening 2
To the laser unit 1 by forming the opening shape close to the laser unit and having a size large enough to keep the terminal 2 easy to insert.
And the printed circuit board 3 were positioned relative to each other.

[0004]

By the way, in the above-mentioned conventional configuration, the terminal 2 of the laser unit 1 is connected to the printed circuit board 3.
When compared to a terminal in which all terminals are aligned with the corresponding through holes when inserting the terminals, a superior effect in terms of ease of insertion can be obtained. Since the opening 4 needs to be formed, the arrangement position of the circuit component and the formation position of the wiring pattern are necessarily limited to a portion outside the terminal 2.
As a result, an increase in the size of the printed circuit board 3 is inevitable, resulting in an increase in the size of the entire optical pickup device.

However, the present invention is intended to reduce the size of a printed circuit board while maintaining the ease of terminal insertion of a laser unit, and to reduce the size of an optical pickup device.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an optical pickup device according to the first aspect of the present invention is a semiconductor laser for emitting a laser beam for recording or reproducing a signal. Comprising a laser unit having at least three or more terminals, and a printed circuit board positioned by the terminals of the laser unit, wherein the printed circuit board has a notch in the outer peripheral edge thereof, and A through-hole is formed, and a part of the terminals of the laser unit is inserted through the through-hole and the remaining terminals are inserted through the cutouts to position the printed circuit board.

According to a second aspect of the present invention, in the optical pickup device according to the first aspect, the laser unit is configured such that a terminal inserted into the through hole of the printed circuit board is dimensionally longer than the remaining terminals. And

[0008]

According to the optical pickup device of the first aspect, by minimizing the number of positioning holes, the positioning between the laser unit and the printed circuit board can be performed while maintaining the ease of terminal insertion. In addition, it is possible to arrange circuit components and form a wiring pattern on a portion of the printed circuit board surrounded by the terminals of the laser unit. Therefore, the size of the printed circuit board can be reduced, and the size of the optical pickup device can be reduced.

According to the optical pickup device of the second aspect, the following operation is provided in addition to the operation of the first aspect. That is, by setting the terminal inserted through the positioning hole to be dimensionally longer than the remaining terminals, it is possible to enhance the ease of alignment between the hole and the terminal to be inserted therein, and to insert the terminal. The work can be done more easily.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in FIGS. 1 and 2 will be described in detail below. In FIGS. 1 and 2, portions common to FIG. 1 are denoted by the same reference numerals as in FIG. 1.

First, FIGS. 1A and 1B are a bottom view and a side view showing a main part of an optical pickup device according to an embodiment of the present invention. In this embodiment, the laser unit 1 in FIG. 1A adopts a terminal arrangement configuration having one terminal 2a on each side and four terminals 2b on each side. The left and right terminals 2a are also used for positioning. On the other hand, the printed circuit board 5, which is a high-frequency oscillation circuit board, has a positioning through hole 6 through which the terminal 2a of the laser unit 1 is inserted, and a notch 7 through which the terminal 2b group is inserted at the upper and lower edges. Form. Thus, the printed circuit board 5 is provided with circuit components including a portion surrounded by the terminals 2a and 2b and forms a wiring pattern, so that the size of the printed circuit board 5 can be reduced within the outer contour of the bottom surface of the laser unit 1. It is kept small enough to fit in.

Therefore, in the above configuration, if only the right and left two terminals 2a and the corresponding through holes 6 are aligned, and the terminals 2a and 2b of the laser unit 1 are inserted into the printed board 5, Terminal 2b is printed circuit board 5
The printed circuit board 5 is positioned in the laser unit 1 by soldering the terminal to be connected to the printed circuit board 5 among the terminals 2a and 2b, which is located in the cutout 7 of the laser unit 1. Installed with. The terminals that are not electrically connected to the printed circuit board 5 are electrically connected to another printed circuit board (not shown) by soldering.

As described above, in this embodiment, the terminals 2a and 2b of the laser unit 1 can be inserted into the printed circuit board 5 by aligning only two terminals out of many terminals. As in the conventional case, it is possible to position the printed circuit board with respect to the laser unit while maintaining the ease of the insertion operation, and at the same time, to dispose the circuit components by using the portion surrounded by the terminals 2a and 2b on the printed circuit board 5. By forming the wiring pattern, the external dimensions of the printed circuit board 5 can be reduced, and the overall size of the optical pickup device can be effectively reduced.

FIG. 2 shows another embodiment of the present invention. In this embodiment, two terminals 2a used for positioning are formed to be dimensionally longer than the other terminals 2b, so that the insertion is possible. Positioning becomes easier during the operation, and the ease of the insertion operation can be further improved.

[0015]

As described above, according to the first aspect of the present invention, when the terminals of the laser unit are inserted into the printed circuit board, the printed circuit board can be positioned with respect to the laser unit while maintaining the ease. By arranging circuit components and forming wiring patterns using a portion surrounded by the terminals of the printed circuit board, the external dimensions of the printed circuit board can be suppressed, and the overall size of the optical pickup device can be effectively reduced. It can be aimed at.

Further, according to the second aspect of the present invention, it is possible to further enhance the ease of alignment between the terminal of the laser unit and the corresponding through hole.

[Brief description of the drawings]

FIGS. 1A and 1B show a main part of an optical pickup device according to an embodiment of the present invention, wherein FIG. 1A is a bottom view and FIG.

FIG. 2 is a side view showing a main part of an optical pickup device according to another embodiment of the present invention.

FIG. 3 shows a main part of a conventional optical pickup device,
(A) is a bottom view, (b) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser unit 2a, 2b terminal 5 Printed circuit board 6 Through hole 7 Notch

Claims (2)

(57) [Claims] 1. A laser unit including a semiconductor laser for emitting a laser beam for recording or reproducing a signal and having at least three terminals, and a printed circuit board positioned by the terminals of the laser unit. In the optical pickup device, the printed circuit board has a notch formed on an outer peripheral edge thereof,
Forming a positioning through hole, positioning the printed circuit board by inserting some of the terminals of the laser unit into the through hole and inserting the remaining terminals into the cutouts. Optical pickup device. 2. The optical pickup device according to claim 1, wherein the laser unit has a terminal inserted into the through hole of the printed circuit board formed to be dimensionally longer than the remaining terminals.