JP2002056546A - Optical pickup device, and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain an adjustment result in a good state after adjustment even when the skewing adjustment of an objective lens is performed after the lens is loaded on a mechanical deck. SOLUTION: A covering member 4 covering an actuator part 3 is provided with an opening 14 for applying adhesive for fixing a skewing adjusting member 2 to an optical block part 1.

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 reading out an information signal from an optical recording medium and a method for manufacturing the optical pickup device.

[0002]

2. Description of the Related Art Conventionally, an optical recording medium has been proposed, and an optical pickup device for reading out an information signal recorded on the optical recording medium has been proposed. In such optical recording media and optical pickup devices, in order to improve the recording density, the reading light wavelength has been shortened in recent years and the objective lens has a high NA (numerical aperture).

As described above, as the reading light wavelength is shortened and the NA of the objective lens is increased, the optical pickup device is mounted on a mechanical deck on which the optical pickup device is movably mounted. There is an increasing need to perform objective lens skew adjustment after the device is mounted. The objective lens skew adjustment is performed by adjusting the tilt of a biaxial actuator that supports the objective lens with respect to an optical block (slide base) that is movably supported by a mechanical deck.

[0004] By tilting the two-axis actuator together with the skew adjustment base to which the two-axis actuator is attached with respect to the optical block section, when adjusting the objective lens skew, an actuator cover for covering the two-axis actuator is removed. It had to be done in a state where it was done.

[0005] This is because, especially when the actuator cover is directly mounted on the optical block section, when the actuator cover is mounted, the skew adjustment base and the optical block section are bonded and fixed, that is, This is because it is difficult to apply an adhesive and perform curing by UV (ultraviolet) irradiation.

[0006]

In the above-described optical pickup device, when the skew adjustment base and the optical block are bonded and fixed after the objective lens skew adjustment is completed, the actuator cover is attached. However, the adjustment points such as the skew adjustment base are exposed to the outside.

Therefore, in this optical pickup apparatus, after the adjustment of the objective lens skew is completed and before the actuator cover is mounted, the skew adjustment base and the like are easily affected by an external force, which causes a deviation in the adjustment of the objective lens skew. There was a risk of causing this.

Further, when attaching the actuator cover to the optical block, stress is applied to the adhesive fixing portion of the skew adjustment base, and there is a possibility that the adjustment accuracy of the objective lens skew is impaired.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and it has been proposed to adjust the objective lens skew after mounting the optical pickup device on a mechanical deck on which the optical pickup device is movably mounted. It is an object of the present invention to provide an optical pickup device and a method of manufacturing such an optical pickup device in which the adjustment result can be maintained well after the adjustment.

[0010]

In order to solve the above-mentioned problems, an optical pickup device according to the present invention comprises: an optical block portion which is moved relative to an optical recording medium;
A skew adjusting member attached to the optical block, the inclination of which can be adjusted with respect to the optical block; and a light beam emitted from the optical block attached to the skew adjusting member is condensed on an optical recording medium. The actuator includes an actuator for supporting the objective lens and a cover member for covering the actuator.

In this optical pickup device, the cover member has an opening for applying an adhesive for fixing the skew adjusting member to the optical block. is there.

In the method of manufacturing an optical pickup device according to the present invention, the inclination of the optical block portion which is moved relative to the optical recording medium with respect to the optical block portion can be adjusted. Adjust the inclination of the skew adjustment member attached to the optical block portion,
An adhesive is applied through an opening provided in a cover member attached to the skew adjustment member to cover an actuator unit that supports an objective lens that focuses a light beam emitted from the optical block unit on an optical recording medium. The method is characterized in that the skew adjusting member is applied and fixed to the optical block.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the optical pickup device according to the present invention has an optical block (slide base) 1.
And a skew adjustment base 2, which is a skew adjustment member attached to the optical block so as to be capable of tilt adjustment,
A biaxial actuator 3 provided on the skew base 2 and an actuator cover 4 attached to the optical block unit 1 and serving as a cover member for covering the skew adjustment base 2 and the biaxial actuator 3 are provided. .

A laser diode serving as a light source, a plurality of optical devices for emitting a light beam emitted from the laser diode to the outside of the optical block 1, and an optical device to be described later are provided in the optical block 1. A photodetector for detecting the light flux reflected back by the recording medium is built in.

The optical block section 1 has a thrust bearing section 5, and as shown in FIG. 2, a guide shaft disposed on the mechanical chassis 101 of the optical recording / reproducing apparatus. The guide shaft 102 is inserted and supported so as to be movable along the guide shaft 102.
On the mechanical chassis 101, a spindle motor 104 for supporting and rotating the optical disc 103 as an optical recording medium is provided. On the mechanical chassis 101, the optical pickup device is moved along the guide shaft 102, so that a signal recording surface of the optical disc 103 supported by the spindle motor 104 and rotated is described later. The moving operation can be performed over the inner and outer peripheries of the optical disc 103 with the objective lenses facing each other.

The skew adjustment base 2 shown in FIG. 1 is mounted on the optical block unit 1 with mounting screws or the like, and is supported via a fulcrum provided on the optical block unit 1.
The optical block 1 can be tilted. When the skew adjustment base 2 is properly inclined with respect to the optical block 1, the skew adjustment base 2 is fixed to the optical block 1 by, for example, a UV (ultraviolet curing type) adhesive.

On the skew adjustment base 2, a biaxial actuator 3 for supporting an objective lens is provided. The objective lens focuses a light beam emitted from the optical block unit 1 on a signal recording surface of an optical disk supported by a spindle motor. The biaxial actuator 3 includes a pair of magnetic yokes 6, 6 erected on the ski adjustment base 2, and the magnetic yokes 6, 6.
And has a magnetic circuit composed of a pair of magnets 7 attached to the. The biaxial actuator 3 has a coil bobbin 9 to which an objective lens 8 is attached. The coil bobbin 9 supports the objective lens 8 with the entrance surface and the exit surface of the objective lens 8 facing the lower side and the upper side, respectively. A focus coil 10 and a tracking coil 11 are mounted on the outer peripheral surface. ing. The coil bobbin 9 is located between the magnetic yokes 6, 6 via a flexible support arm 12, and is attached to the skew adjustment base 2.

In the two-axis actuator 3, when a drive current is supplied to the focus coil 10, the interaction between the magnetic field formed by the drive current and the magnetic field of the magnetic circuit formed by the magnets 7, 7 causes the coil bobbin 9 to move. Is
The moving operation is performed in the focus direction which is the direction of the optical axis of the objective lens 8 indicated by the arrow Fo in FIG. In the two-axis actuator 3, when a drive current is supplied to the tracking coil 11, the interaction between the magnetic field formed by the drive current and the magnetic field of the magnetic circuit formed by the magnets 7 causes the coil bobbin 9 to move. The moving operation is performed in a tracking direction orthogonal to the optical axis of the objective lens 8 indicated by an arrow Tr in FIG. This tracking direction is a direction that coincides with the system direction of the optical disk on the mechanical chassis.

The biaxial actuator 3 is supplied with a drive current corresponding to the focus error signal and the tracking error signal to the focus coil 10 and the tracking coil 11, respectively, thereby moving the coil bobbin 9 and moving the coil bobbin 9 by the objective lens 8. The focal point of the formed light beam is made to follow the recording track of the optical disk.

The tilt of the skew adjustment base 2 with respect to the optical block unit 1 of the biaxial actuator 3 is adjusted together with the objective lens 8 by adjusting the tilt of the skew adjustment base 2 with respect to the optical block unit 1.

The actuator cover 4 is formed of a material such as a synthetic resin material or a metal, and is formed in a substantially hollow box shape. The lower surface facing the optical block 1 is opened, and the upper surface is substantially formed. At the center, a lens opening 13 for the objective lens 8 to face upward is formed. The actuator cover 4 has an adhesive application work opening 14 over a part of the top surface and the side surface.

In this optical pickup device, the reflected light beam from the signal recording surface of the light beam emitted from the laser diode and condensed on the signal recording surface of the optical disk by the objective lens 8 is again passed through the objective lens 8 to the photodetector. , The information signal recorded on the optical disk is read.

The optical pickup device according to the present invention configured as described above is manufactured by the method for manufacturing an optical pickup device according to the present invention. That is, in this optical pickup device, the inclination of the skew adjustment base 2 with respect to the optical block unit 1 is adjusted as shown by arrows Ra and Ta in FIG. This adjustment is performed by reading an information signal from the optical disc 103 rotated by the spindle motor 104 by this optical pickup device, and judging whether the inclination of the objective lens 8 is good or not according to the state of the read signal.

When the adjustment is completed, as shown in FIG. 3, the skew adjustment base 2 and the optical block 1 are connected to each other by using an adhesive dispenser 15 through an adhesive application opening 14. In the meantime, for example, an adhesive such as a UV (ultraviolet curing type) adhesive is applied. In this adhesive application operation, the optical pickup device is moved to the mechanical chassis 1.
01 and the actuator cover 4
Can be performed with the optical module attached to the optical block 1.

Further, when the application of the adhesive is completed, as shown in FIG. 4, for example, by using a UV (ultraviolet) irradiator 16 through an opening 14 for applying the adhesive,
By irradiating the adhesive applied between the skew adjustment base 2 and the optical block 1 with ultraviolet light, the adhesive is cured and the skew adjustment base 2 is fixed to the optical block 1. This curing operation can be performed with the optical pickup device attached to the mechanical chassis 101 and with the actuator cover 4 attached to the optical block unit 1.

[0027]

As described above, in the optical pickup device and the method of manufacturing the optical pickup device according to the present invention, the cover member is attached to adjust the inclination of the skew adjustment member with respect to the optical block portion and fix the skew adjustment member by bonding or the like. It can be performed as it is. That is, there is no need to attach a cover after adjusting the inclination of the skew adjustment member with respect to the optical block portion, and there is no possibility that the operation of attaching the cover member will affect the adjustment state of the inclination.

Further, in the optical pickup device, even when the optical pickup device is mounted on the mechanical deck of the recording / reproducing device, the inclination of the skew adjusting member with respect to the optical block portion can be adjusted and fixed by bonding or the like. Therefore, it is not necessary to provide a mechanism for adjusting the tilt of the entire optical pickup device on the mechanical deck.

That is, according to the present invention, even when the objective lens skew adjustment is performed after the optical pickup device is mounted on a mechanical deck on which the optical pickup device is movably mounted, the adjustment result is preferably maintained after the adjustment. It is possible to provide an optical pickup device configured as described above and a method for manufacturing such an optical pickup device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of an optical pickup device according to the present invention.

FIG. 2 is a perspective view showing a state in which the inclination of the skew adjustment member with respect to the optical block is adjusted in the optical pickup device.

FIG. 3 is a perspective view showing a state in which an adhesive for fixing a skew adjustment member to an optical block portion is applied in the optical pickup device.

FIG. 4 is a perspective view showing a state in which an adhesive for fixing the skew adjustment member to the optical block is cured in the optical pickup device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Optical block part, 2 Skew adjustment member, 3 2-axis actuator, 4 actuator cover, 8 Objective lens, 14 Adhesive application opening

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tsutomu Sakurai 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D117 AA02 CC07 GG00 KK08 5D119 AA38 JC03

Claims (2)

[Claims] An optical block that is moved relative to an optical recording medium; a skew adjustment member that is capable of adjusting an inclination with respect to the optical block and is attached to the optical block; An actuator unit that is attached to the skew adjustment member and supports an objective lens that focuses a light beam emitted from the optical block unit on an optical recording medium; and a cover member that covers the actuator unit. An optical pickup device having an opening for applying an adhesive for fixing the skew adjusting member to the optical block diagram. 2. A skew adjusting member attached to the optical block, wherein the inclination of the optical block relative to the optical recording medium can be adjusted with respect to the optical block. An opening provided in a cover member attached to the skew adjustment member for adjusting an inclination and covering an actuator unit supporting an objective lens for focusing a light beam emitted from the optical block unit on an optical recording medium. And fixing the skew adjusting member to the optical block portion by applying an adhesive through the optical pickup device.