JP2594189B2 - 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 which moves along a recording surface of a signal recording medium and has a flexible substrate connected to electric components.

[0002]

2. Description of the Related Art An optical pickup device for irradiating a signal recording medium with a light beam for reproducing a signal recorded on a signal recording medium such as a disk or for recording a signal on a signal recording medium is provided with the light beam (light beam). And an electric component such as a laser diode for generating a laser beam. The signal recording medium is slid by being guided by two parallel guide shafts as shown in, for example, Japanese Utility Model Application Laid-Open No. 63-55265. Therefore, a flexible substrate is conventionally used to supply power to the electric components, detect signals, and the like.

[0003]

A flexible substrate used in an optical pickup device according to the present invention is formed by printing electric wiring with a conductive material on a thin synthetic resin sheet having flexibility, and is mounted on the optical pickup device. A connection portion connected to a terminal such as a laser diode provided, a bonding portion including the connection portion and bonded to a side surface of the optical pickup device, and a main body side of an optical disc player or the like separated from the optical pickup device. Although it can be distinguished from the extension part connected to the power supply circuit and the signal reproduction circuit, when the optical pickup device moves along the recording surface of the signal recording medium as described above, especially the extension part of the flexible substrate When it has extended,
A relatively large peeling force is applied to the boundary between the bonding portion and the extending portion.

[0004] This peeling force often exceeds the limit of the adhesive force of the bonded portion of the flexible substrate, and there has been a problem that the bonded portion of the flexible substrate is peeled off from the boundary portion due to long-term use.

The present invention has been made to solve the above technical problem, and provides an optical pickup device in which peeling of a flexible substrate caused by moving along a signal surface of a signal recording medium is prevented. The purpose is to:

[0006]

According to the present invention, a flexible substrate 20 provided on an optical pickup device 1 moving along the recording surface of a signal recording medium CD is provided.
Connecting portion 21 connected to the electric component (laser diode 3), bonding portion 22 bonded to the surface of optical pickup device 1 (base 2), and extending portion extending away from optical pickup device 1 23, and the bonding portion 22 (extending portion 2) is provided on both sides of the boundary portion 24 between the bonding portion 22 and the extending portion 23.
2A).

[0007]

According to the present invention, the adhesive portion 22 and the extending portion 23 of the flexible substrate 20 are moved by the movement of the optical pickup device 1.
The peeling force applied to the boundary portion 24 is received by the bonding portions 22 (extended portions 22A) located on both sides of the boundary portion 24.

[0008]

Next, an embodiment will be described with reference to the drawings. FIG.
2 is a side view of the optical pickup device 1, and FIG. 2 is a partially transparent plan view of the optical pickup device 1. An aluminum die-cast base 2 of the optical pickup device 1 has a laser diode 3 as a light source for generating a light beam (laser light), and a diffraction grating 4 for diffracting the light beam emitted from the laser diode 3. A half mirror 5 for dividing an optical path of the light beam and generating astigmatism, a mirror 6 for vertically reflecting the light beam reflected by the half mirror 5, and a signal recording medium CD such as a disk. The half mirror 5 is modulated by a signal.
A photodetector 7 for receiving a light beam transmitted through is provided.

The half mirror 5 is formed of a plane-parallel plate, and has a surface direction of 45 degrees with respect to the optical axis of each of the light beam from the laser diode 3 and the light beam reflected by the signal recording medium CD. They are arranged at an angle.

The metallic cover 8 attached to the base 2
On the inner surface (shown by a broken line in FIG. 2), the light beam reflected by the half mirror 5 and the mirror 6 located above the mirror 6 is focused on a signal track on the signal surface of the signal recording medium CD. Objective lens 9, a lens holder 10 for holding the objective lens 9, a focusing coil (not shown) mounted on the lens holder 10, a tracking coil 11 similarly mounted on the lens holder 10, the lens holder 10 A pair of permanent magnets 12 and 13 whose N pole faces face each other with an interposition therebetween, and an electromechanical conversion mechanism including a wire 14 and the like whose central portion is fixed to the lens holder 10 are attached.

A protrusion 15 slidably engaged with one of a pair of guide shafts (not shown) is formed at one end of the base 2 on the photodetector 7 side, and the protrusion 15 is formed at the opposite end. A projection 16 attached to the other side of the guide shaft is formed so as to protrude, whereby the optical pickup device 1 is guided by the guide shaft and along the signal surface of the signal recording medium CD in the direction of the arrow in FIGS. It is configured to move to.

Further, a power is supplied to the laser diode 3 by connecting a flexible substrate 20 having a flexible synthetic resin thin plate on which electric wiring is printed with a conductive material. This flexible substrate 20 has a laser diode 3 as shown in FIGS.
, A bonding portion 22 including the connection portion 21 and bonded to the side surface of the base 2 (a portion indicated by oblique lines in FIGS. 1 and 4), and an optical system separated from the base 2. Extension portion 23 connected to a power supply circuit or the like of a disc player
It is composed of

The connecting portion 21 is formed at one end of the flexible substrate 20 and has a substantially circular shape conforming to the back surface shape of the laser diode 3, and the electric wiring printed thereon is soldered to the laser diode 3. . Also,
An adhesive is applied to the back surface of the bonding portion 22 and is bonded from the connecting portion 21 at one end to the surface 2A orthogonal to the moving direction of the optical pickup device 1 along the side surface of the base 2. The area of the corner of the base 2 is enlarged so as to increase the adhesive force. Further, the extending portion 23 is provided on the surface 2 of the base 2.
The portion A is branched upward from the bonding portion 22, and the bonding portion 22 is further extended beyond a boundary portion 24 with the extension portion 23 to form an extension portion 22 </ b> A bonded to the surface 2 </ b> A of the base 2. ing. On the other hand, the extending portion 23 extends from the boundary portion 24 in a crank shape in a direction opposite to the connecting portion 21, but has a pressed portion 23 </ b> A that protrudes in a direction opposite to the extending direction. The pressed portion 23A is held on the cover 8 by a pressing piece 8A cut and raised on the side surface of the cover 8.

Next, the path of the light beam of the optical pickup device 1 shown in FIG. 2 will be described. The light beam generated from the laser diode 3 is diffracted by the diffraction grating 4 and formed into three beams, a main beam and two sub beams, and then reflected by the surface of the half mirror 5 toward the mirror 6. . The light beam reflected vertically upward by the mirror 6 is incident on an objective lens 9 located above the mirror, is converged by the objective lens 9, and is irradiated on the signal surface of the signal recording medium CD.

The light beam applied to the signal surface is modulated and reflected by the signal surface, and is again passed through the objective lens 9.
The light is reflected by the mirror 6, returns to the half mirror 5, and transmits through the half mirror 5. At this time, astigmatism occurs in the light beam according to the thickness, the refractive index, and the angle of inclination of the half mirror. The light beam transmitted through the half mirror 5 is received by a photodetector 7. By calculating the output of a light receiving element (not shown) constituting the photodetector 7, a focusing shift of the light beam to the signal surface and a tracking shift of the light beam to the signal track are detected.
The objective lens 9 is driven by the electromechanical conversion mechanism according to the detected output, and the light beam is accurately converged on the signal track of the signal recording medium CD.

Incidentally, during the detection operation, the optical pickup device 1 moves along the signal recording surface of the signal recording medium CD. This movement causes the flexible substrate 20 to expand or bend. However, when the flexible substrate 20 is fully extended, the flexible substrate 20 is relatively large at the end of the boundary portion 24 between the bonding portion 22 and the extending portion 23 on the extension portion 22A side. A large peeling force is applied. However,
Since the extension portion 22A is formed in the bonding portion 22, the bonding portion 22 is present on both sides of the boundary portion 24. At this time, the peeling force applied to the boundary portion 24 is reduced on both sides of the boundary portion 24. Will be firmly accepted. Especially,
Since the adhesive portion 22 is extended to the end side of the boundary portion 24 to which the peeling force is applied (extended portion 22A), peeling of the adhesive portion 22 can be prevented very effectively.

The shape of the flexible substrate 20 is not limited to the embodiment, but can be variously changed without departing from the spirit of the present invention.

[0018]

According to the present invention, the peeling force applied to the boundary between the bonding portion and the extending portion of the flexible substrate due to the movement of the optical pickup device can be received by the bonding portions located on both sides of the boundary portion. In addition, the adhesive strength of the flexible substrate with respect to the peeling force is increased, and peeling from the optical pickup device can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a side view of an optical pickup device.

FIG. 2 is a partially transparent plan view of the optical pickup device.

FIG. 3 is a plan view of an optical pickup device of a flexible substrate portion.

FIG. 4 is an exploded side view of a base, a cover, and a flexible substrate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical pickup device 2 base 3 laser diode 20 flexible substrate 21 connection portion 22 bonding portion 22A extension portion 23 extension portion 24 boundary portion CD signal recording medium

Claims (1)

(57) [Claims] 1. An optical pickup device, which moves along a recording surface of a signal recording medium and includes a flexible substrate, wherein the flexible substrate includes a connection portion connected to an electric component of the optical pickup device, and the optical pickup. An adhesive portion adhered to the device surface, and an extending portion extending away from the optical pickup device,
An optical pickup device, wherein the bonding portion is formed on both sides of a boundary between the bonding portion and the extending portion.