JP3158085B2 - 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 used for an optical information reproducing device such as a compact disk player and an optical disk memory device.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, an optical pickup device of this type includes a casing 11 made of a metal casting or a plastic molded product. And mirror 1
Components such as optical system members 6 and 17 and an objective lens 18 and electric circuit members (not shown) are respectively incorporated in predetermined positions. On the other hand, a laser 12 as a light source, a light receiving element 14 as a photoelectric conversion element, a connector 20 for connection to an external circuit, and a wiring pattern 19
Are respectively provided at predetermined positions outside the housing 11. In addition, the housing 11 has a three-dimensionally complicated shape in order to incorporate and hold constituent members such as an optical system member and an electric circuit member at predetermined positions, respectively. I have. Therefore, the wiring pattern 19 is
Cannot be brought into close contact with the housing 11 and the wiring pattern 1
9 are in a separated state.

[0003]

However, in the above-mentioned conventional structure, since the wiring pattern 19 cannot be brought into close contact with the housing 11, a complicated operation is required for wiring the wiring pattern 19 in a circuit. have.

An object of the present invention is to provide an optical pickup device that can be manufactured without requiring complicated operations.

[0005]

To achieve the above object of the Invention The present invention comprises a flat plate made of metal, and a wiring pattern formed on the upper surface of the plate, the wiring pattern electrically connected to the light emitting An electric circuit member including at least an element, a light receiving element, and a connector, and an optical system member that guides light emitted from the light emitting element to a recording medium, and guides light reflected from the recording medium to the light receiving element, The electric circuit member and the optical system member are placed on the upper surface of the flat plate and fixedly attached thereto, while the input and output of the wiring pattern are integrated in the connector.

Further, the present invention provides an electric circuit member including at least a flat plate, a wiring pattern formed on an upper surface of the flat plate, a light emitting element and a light receiving element electrically connected to the wiring pattern, An optical system member for guiding light emitted from the element to the recording medium and guiding the light reflected from the recording medium to the light receiving element, wherein the electric circuit member and the optical system member are mounted on the upper surface of the flat plate. On the other hand, a hole or a recess is formed in the flat plate, and the hole or the recess is formed in the hole or the recess.
The optical system member is arranged .

[0007] Therefore, according to the present invention, to form a wiring pattern on the upper surface of the flat plate made of metal, placed on the electric circuit member and the optical member to be the wiring pattern electrically connected to the upper surface of the flat plate By mounting and fixing, the heat radiation characteristics of the light emitting element and the workability of assembling the optical pickup device can be improved. In addition, by integrating the input and output of the wiring pattern into the connector, the workability when attaching the optical pickup device to an optical information reproducing device or the like can be improved.

According to the present invention, a wiring pattern is formed on an upper surface of a flat plate, and an electric circuit member and an optical member which are electrically connected to the wiring pattern are mounted on the upper surface of the flat plate. By fixing, the workability of assembling the optical pickup device can be improved. Moreover, by arranging the optical members in the holes or recesses formed in the flat plate, the positioning and adjustment of the cylindrical optical members can be facilitated, and the thickness of the optical pickup device can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

An optical pickup device according to the present invention is shown in FIG.
As shown in FIG. 1, a flat housing 1 formed of a flat metal plate such as aluminum is provided. The material of the housing 1 is not limited to metal, and may be any material having conductivity.

The casing 1 is formed by stamping a flat plate of a metal such as aluminum into a predetermined shape by press working, and a predetermined position of the casing 1 serves as a member positioning portion. Holes 1a and 1b
Are drilled.

The thickness of the housing 1 is not particularly limited, and may be any thickness as long as a flat plate having conductivity such as metal can be pressed. The thickness of the metal plate that can be pressed is slightly different depending on the material of the metal plate, but is up to about 5 mm.

In the holes 1a and 1b, cylindrical optical system members of the collimator lens 3 and the spot lens 5 are provided with respective side surfaces 3a and 5a, respectively.
1b is fixed in a state of being placed on and abutting on the upper end portions 1a 'and 1a' of 1b.

The cylindrical optical system member is connected to each of the holes 1.
Means for fixing to a.1b are, for example, adhesion with an adhesive,
Alternatively, it is a fixing means such as pressing by a leaf spring, and is not particularly limited.

On the upper surface of the housing 1, a light receiving element 4 as a photoelectric conversion element and a circuit board 1 of the light receiving element 4 are provided.
0, mirrors 6 and 7 as optical system members, and an objective lens 8 are respectively disposed at predetermined positions, and each component is configured by a flexible printed wiring board (hereinafter referred to as a wiring pattern) 9. The members are provided with predetermined wiring, and their inputs and outputs are concentrated in the connector 10.

As shown in FIG. 2, the wiring pattern 9 includes a conductor 9a, a cover film 9b, a base film 9
c and an adhesive tape 9d.

The conductor 9a is made of copper, and is sandwiched between a cover film 9b and a base film 9c described later. The thickness of the conductor 9a is 20 μm or more.
It is about 10 μm.

The cover film 9b and the base film 9c are each formed of an electrically insulating material such as polyimide or polyester, and the thicknesses of the cover film 9b and the base film 9c are as follows.
Each is about 25 μm to 100 μm.

The wiring pattern 9 is fixed to the flat casing 1 by attaching an adhesive tape 9d attached to the lower face of the base film 9c to the upper face of the casing 1. Thus, the housing 1 in which the wiring pattern 9 is fixed on the upper surface itself is formed like a single printed circuit board.

The adhesive tape 9 d is not particularly limited as a member constituting the wiring pattern 9,
For example, the wiring pattern 9 is fixed to the housing 1 by a fixing means such as an adhesive.
It may be fixed to the upper surface of the.

In the above configuration, the laser light emitted from the laser 2 passes through the collimating lens 3 to become parallel light as shown by a dashed line in FIG. The light is reflected and reaches the objective lens 8. The objective lens 8 condenses the reflected light and irradiates the light onto the information surface of the optical disk (not shown) to form a spot, and guides the reflected light reflected on the information surface to the mirror 7 again. . After being reflected by the mirror 7, the reflected light passes through the mirror 6 and reaches the spot lens 5. Then, the reflected light that has reached the spot lens 5 is converged and supplied to the light receiving element 4, and the information on the optical disk is read.

The hole 1a formed in the housing 1 is used for positioning and adjustment when the cylindrical optical member is mounted and fixed on the housing 1, and the shape is particularly limited. Instead, as shown in FIGS. 3 (a) and 3 (b), as shown in FIG. 3 (a) and FIG. 3 (b), a projection 1b, 1b as a member positioning portion and a depression 1c are formed on a conductive plate such as a metal forming the housing 1. Each of the members may be formed by half-blanking pressing, so that a cylindrical optical system member such as the collimator lens 3 is positioned and adjusted on the housing 1.

In addition, the housing 1 of the optical pickup device according to the present invention has a cylindrical optical system member on the upper surface of the housing 1 without providing the member positioning portions of the holes 1a, the protrusions 1b, and the recesses 1c. It may be fixed by fixing means such as an adhesive.

Providing a cover on the optical pickup device according to the present invention is useful for dust prevention measures. The material of the cover is not particularly limited, such as metal or plastic. The use of the metal cover further improves the shielding effect in the optical pickup device of the above embodiment.

[0025]

As described above , according to the present invention, the light emitting element
Heat radiation characteristics and assembly workability of optical pickup device
And the optical pickup device
Workability when attaching the device to an optical information playback device, etc.
Can be improved.

According to the present invention, an optical pickup device is provided.
The workability of assembling can be improved and the cylinder
Easy positioning adjustment of optical system members
The thickness of the up device can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an optical pickup device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a wiring pattern is adhered to a housing in the optical pickup device.

3A and 3B are perspective views showing another example of a member positioning section in the optical pickup device, wherein FIG. 3A shows a state in which a collimating lens is positioned and adjusted by a convex portion formed on a housing, and FIG. Shows a state where the collimating lens is positioned by the concave portion formed in the housing.

FIG. 4 is a schematic configuration diagram showing an optical pickup device as a conventional example.

[Explanation of symbols]

 Reference Signs List 1 housing 2 laser 3 collimating lens 4 light receiving element 5 spot lens 6, 7 mirror 8 objective lens 9 wiring pattern

Continuation of the front page (56) References JP-A-61-71432 (JP, A) JP-A-61-280044 (JP, A) JP-A-62-198018 (JP, U) JP-A-2-16421 (JP) , U) Japanese Utility Model Application Hei 1-90189 (JP, U) Japanese Utility Model Application Model Sho 62-90422 (JP, U) Japanese Utility Model Application Utility Model Hei 9-96620 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB G11B 7/12-7/22 G11B 33/12 304

Claims (2)

(57) [Claims] [1 claim: a flat plate made of metal, and a wiring pattern formed on the upper surface of the plate, at least comprising an electric circuit member with wiring patterns electrically connected to the light emitting element and a light receiving element and the connector, the An optical system member for guiding the light emitted from the light emitting element to the recording medium and guiding the light reflected from the recording medium to the light receiving element, and mounting the electric circuit member and the optical system member on the upper surface of the flat plate An optical pickup device wherein the input and output of the wiring pattern are aggregated in the connector while being fixed. 2. An electric circuit member including at least a flat plate, a wiring pattern formed on an upper surface of the flat plate, and a light emitting element and a light receiving element electrically connected to the wiring pattern. And an optical system member for guiding the light reflected from the recording medium to the light receiving element. The electric circuit member and the optical system member are mounted and fixed on the upper surface of the flat plate. On the other hand, an optical pickup device, wherein a hole or a concave portion is formed in the flat plate, and the optical system member is disposed in the hole or the concave portion.