JPH075548Y2 - Optical pickup device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an optical pickup device in which a photodetector is attached to a metal plate via a flexible printed wiring board.

[Prior Art] FIG. 3 is a perspective view before attachment showing a relationship between a photodetector of a conventional optical pickup device, a flexible printed wiring board (hereinafter referred to as FPC), and a metal plate, and FIG. It is sectional drawing which shows the state after attaching a detector to a metal plate.

In the figure, 1 is a flat package type photodetector, 2
Is FPC, 3 is a metal plate, 1a is a lead wire of the photodetector 1, 2a is F
The conductor printed on the PC2, 2b is the insulating film of the FPC2, 4 is the solder connecting the lead wire 1a and the conductor 2a, and 5 is the reflected light from the optical disk.

Next, the operation will be described. Upon receiving the reflected light 5, the photodetector 1 outputs a current corresponding to the intensity of the reflected light from the lead wire 1a via the conductor 2a.

The lead wires 1a can output different currents depending on the package of the photodetector 1.

The metal plate 3 and the FPC 2 are provided with holes 3a and 2c so that the photodetector 1 can receive the reflected light 5.

[Problems to be solved by the invention]

Conventionally, since the mounting structure of the photodetector 1 is as described above, the distance between the lead wire 1a and the metal plate 3 is very short (the distance between the thickness of the conductor 2a and the thickness of the insulating film 2b),
If moisture adheres to the lead wire 1a in a high humidity atmosphere, the lead wires 1a may be electrically connected through the end surface of the metal plate 3.

The present invention has been made in order to solve the above problems, and by increasing the insulation distance between the lead wire and the end surface of the metal plate, even if moisture adheres to each lead wire, It is an object of the present invention to obtain an optical pickup device which does not conduct electricity through the end face of the.

[Means for solving problems]

In order to achieve the above-mentioned object, the optical pickup device of the present invention reduces the diameter of the hole for exposing the light-receiving surface of the FPC as compared with the hole for exposing the light-receiving surface of the photodetector formed in the metal plate. This is a long insulation distance between the lead wire and the metal plate.

[Action]

According to this invention, the end faces of the lead wire and the metal plate are insulated by the insulating film of the FPC, and the insulation distance can be lengthened without increasing the thickness of the FPC inserted between the lead wire and the metal plate. Even in a high-humidity atmosphere, the lead wires do not conduct with each other through the end surface of the metal plate.

〔Example〕

FIG. 1 is a perspective view showing a relation between a photodetector, an FPC and a metal plate of an optical pickup device according to the present invention before mounting, and FIG. 2 shows a state after the photodetector is mounted on the metal plate. It is sectional drawing shown.

In the figure, 1 is a flat package type photodetector, 2
Is FPC, 3 is a metal plate, 1a is a lead wire of the photodetector 1, 2a is F
The conductor printed on the PC2, 2b is the insulating film of the FPC2, 4 is the solder connecting the lead wire 1a and the conductor 2a, and 5 is the reflected light from the optical disc or the like.

Next, the operation will be described.

The photodetector 1 attached to the FPC2 attached to the surface of the metal plate 3 receives the reflected light 5 input from the holes 3a and 2c for exposing the light receiving surface formed in the metal plate 3 and the FPC2. , A current corresponding to the intensity of the reflected light 5 is output from the lead wire 1a through the conductor 2a.

Here, the diameter of the hole 2c formed in the FPC 2 is made smaller than the diameter of the hole 3a of the metal plate 3, which increases the insulation distance between the lead wire 1a and the end face of the metal plate 3 to ensure reliable insulation. To be done.

[Effect of device]

As described above, according to the present invention, the insulation distance can be increased without increasing the thickness of the FPC that intervenes between the lead wire of the photodetector and the metal plate. There is no effect that the wires are connected to each other through the end face of the metal plate, and there is an effect that a normal operation is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a relationship between a photodetector, an FPC and a metal plate of an optical pickup device according to an embodiment of the present invention before attachment, and FIG. 2 is a state after the photodetector is attached to a metal plate. FIG. 3 is a perspective view showing a state before attachment of the conventional example, and FIG. 4 is a sectional view showing a state after attachment of the conventional example. In the figure, 1 is a photodetector, 2 is an FPC, 2c is a hole, 3 is a metal plate, and 3a is a hole. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A photodetector for detecting reflected light from an optical disc, and a metal plate to which a flexible printed wiring board electrically connected to a lead wire of the photodetector is attached,
In the one in which the light receiving surface of the photodetector is exposed from the hole formed in the metal plate and the flexible printed wiring board, the diameter of the hole formed in the flexible printed wiring board is larger than the diameter of the hole formed in the metal plate. An optical pickup device characterized by being made smaller.