JPH07153084A - Optical pickup device - Google Patents

Abstract

(57) [Abstract] [Purpose] The printed circuit board is positioned with respect to the laser unit while maintaining the ease of inserting the terminals, and at the same time, the overall size of the optical pickup device is reduced. A printed circuit board 5 is formed with a through hole 6 facing a terminal 2a which functions to position the laser unit 1 and a cutout portion 7 facing a remaining group of terminals 2b. The holes 6 are aligned and inserted, and the remaining terminal 2b group is located in the notch 7, while the circuit board is arranged and the wiring pattern is formed in the portion of the printed board 5 surrounded by the terminals 2a and 2b. To do.

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 disc or reproducing a signal on a disc, and more particularly to positioning a printed circuit board by terminals of a laser unit.

[0002]

2. Description of the Related Art Conventionally, a semiconductor laser for emitting a laser beam for recording or reproducing a signal, a laser unit including a light receiving element and optical system parts (diffraction grating, hologram, etc.) are provided, and the terminal of this laser unit is provided. An optical pickup device has been proposed which is configured to position a printed circuit board by utilizing it.

Explaining one example thereof with reference to FIG. 3, the laser unit 1 includes, for example, a high-power semiconductor laser,
A hologram laser unit of high output using a hologram, which has a large number of terminals 2 on its back surface, a printed circuit board 3 is a circuit board for high-frequency oscillation, and all terminals 2 are inserted in the central portion thereof. The opening 4 is formed to have the shape of the opening 4 whose peripheral edge is
The laser unit 1 has an opening shape that is close enough to the terminal and has a size large enough to maintain the ease of inserting the terminal 2.
And the printed circuit boards 3 were mutually positioned.

[0004]

By the way, in the above-mentioned conventional configuration, the terminals 2 of the laser unit 1 are connected to the printed circuit board 3.
When compared with the case where all the terminals are aligned with the corresponding through-holes when they are inserted into the connector, it is possible to exert an excellent effect in ease of insertion. Since it is necessary to form the opening 4, the position where the circuit component is arranged and the position where the wiring pattern is formed are inevitably limited to a portion outside the terminal 2.
As a result, an increase in the size of the printed circuit board 3 is unavoidable, leading to an increase in size of the entire optical pickup device.

However, the present invention aims at downsizing of the optical pickup device by making it possible to downsize the printed circuit board while maintaining the ease of inserting the terminals of the laser unit.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems. An optical pickup device according to claim 1 emits a laser beam for recording or reproducing a signal. Including a laser unit having at least three terminals, and a printed circuit board positioned by the terminals of the laser unit, the printed circuit board has a cutout portion at an outer peripheral edge thereof, and is used for positioning. Through holes are formed, and some of the terminals of the laser unit are inserted into the through holes and the remaining terminals are inserted into the cutout portions 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 has a terminal which is inserted through the through hole of the printed circuit board and is dimensionally longer than the remaining terminals. And

[0008]

According to the optical pickup device of the first aspect, by positioning the number of through holes for positioning to the necessary minimum, the positioning of the laser unit and the printed circuit board can be performed while maintaining the ease of inserting the terminals. Moreover, it is possible to dispose circuit components and to form a wiring pattern on the printed circuit board in a portion surrounded by the terminals of the laser unit. Therefore, the printed circuit board can be downsized, and in turn, the optical pickup device can be downsized.

According to the optical pickup device of the second aspect, in addition to the action of the first aspect, the following action is provided. That is, by setting the terminal to be inserted into the positioning through hole to be dimensionally longer than the remaining terminals, the ease of aligning the through hole and the terminal to be inserted thereinto can be increased, and the terminal insertion This will make the work much easier.

[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. 1 and 2, the same parts as those in FIG. 1 are designated by the same reference numerals.

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 the present embodiment, the laser unit 1 employs a terminal arrangement configuration in which one terminal 2a is provided on each of the left and right sides and four terminals 2b are provided on each of the upper and lower sides in FIG. The left and right terminals 2a are also used for positioning. On the other hand, the printed circuit board 5, which is a circuit board for high-frequency oscillation, has a through hole 6 for positioning through which the terminal 2a of the laser unit 1 is inserted, and cutouts 7 through which the groups of terminals 2b are inserted at the upper and lower edges thereof. Form. Thus, the printed circuit board 5 is provided with a circuit component including a portion surrounded by the terminals 2a and 2b and a wiring pattern is formed, so that the size of the printed circuit board 5 can be controlled within the outer surface of the bottom surface of the laser unit 1. The size is small enough to fit in.

Therefore, in the above structure, only the two left and right 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 circuit board 5 to obtain the respective positions. Terminal 2b is printed circuit board 5
The printed circuit board 5 is positioned with respect to the laser unit 1 by soldering the terminals to be connected to the printed circuit board 5 of the terminals 2a and 2b located in the cutout portion 7 of the printed circuit board 5 to the laser unit 1. Can be installed with. The terminals 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 of the many terminals. Similarly to the conventional case, the printed circuit board can be positioned with respect to the laser unit while maintaining the ease of insertion work, and at the same time the circuit components are arranged by utilizing the portion surrounded by the terminals 2a and 2b on the printed circuit board 5. By forming the wiring pattern and the wiring pattern, the external dimensions of the printed circuit board 5 can be suppressed to a small size, and the size of the entire 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 dimensionally made longer than the other terminals 2b so as to be inserted. Positioning becomes easy at the time of work, and the ease of insertion work can be further enhanced.

[0015]

As described above, according to the first aspect of the 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 its ease. By arranging the circuit components and forming the wiring pattern by utilizing the part surrounded by the terminals of the printed circuit board, it is possible to suppress the outer dimensions of the printed circuit board and effectively reduce the size of the entire optical pickup device. Can be achieved.

Further, according to the second aspect of the invention, it is possible to further enhance the ease of aligning the terminals of the laser unit with the corresponding through holes.

[Brief description of drawings]

FIG. 1 shows a main part of an optical pickup device according to an embodiment of the present invention, (a) is a bottom view and (b) is a side view.

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 and (b) is a side view.

[Explanation of symbols]

 1 Laser Unit 2a, 2b Terminal 5 Printed Circuit Board 6 Through Hole 7 Notch

Claims (2)

[Claims] 1. A laser unit including a semiconductor laser that emits a laser beam for recording or reproducing a signal, 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 cutout portion formed on an outer peripheral edge thereof.
A positioning through hole is formed, and some of the terminals of the laser unit are inserted into the through hole and the remaining terminals are inserted into the notch to position the printed circuit board. Optical pickup device. 2. The optical pickup device according to claim 1, wherein in the laser unit, a terminal inserted into the through hole of the printed board is formed to be dimensionally longer than the remaining terminals.