JP3937441B2 - Optical head and optical disk apparatus - Google Patents

Description

The present invention relates to an optical disk apparatus capable of recording and / or reading data by irradiating light onto an optical disk, and more particularly to an optical head that irradiates light onto the optical disk.

In recent years, as an image, audio, or information recording medium, an optical disk that can be recorded and / or read by irradiating light is often used. As the optical disc, a CD (Compact Disc), a DVD (Digital Versatile Disc) and the like are widely used. An optical disc apparatus that records and / or reads data on the optical disc using the optical disc as a recording medium includes an optical head that irradiates a recording surface of the optical disc with laser light and detects reflected light.

FIG. 6 shows a schematic layout of a DVD player which is an example of a conventional optical disc apparatus. The DVD player PM shown in FIG. 6 includes a spindle motor Sp that rotates the DVD medium Ds,
An optical head B for detecting the light reflected by irradiating the surface of the DVD medium Ds with laser light, a decoder Dc for decoding the signal detected by the optical head B, and an external connection unit for connecting to an external monitor Mn Oc and a control unit Cont.

First, the controller Cont drives the spindle motor Sp to rotate the DVD medium Ds. Laser light is irradiated from the optical head B to the rotating DVD medium Ds, and the reflected light is detected by the optical head B. The light detected by the optical head B is sent to the decoder Dc as an electrical signal. The video is displayed on the monitor Mn by demodulating the video signal with the decoder Dc and sending it to the monitor Mn.

FIG. 2 shows the layout of the optical head. As shown in FIG. 2, a laser light source Ld, a mirror Mr,
A collimator lens 3, an objective lens 4, a beam splitter Bs, and a light receiving element Pd are provided. The laser light emitted from the laser light source Ld is reflected by the mirror Mr and enters the collimator lens 3. The laser light incident on the collimator lens 3 is emitted as parallel light and enters the objective lens 4. The laser light incident on the objective lens 4 is irradiated onto the recording surface of the DVD medium Ds.

At this time, the laser beam is focused on the recording layer of the DVD medium Ds, and the optical axis and DV
Laser light is irradiated so that the recording layer of the D media Ds is perpendicular. Beam splitter B
s is a prism that transmits half of the incident laser light and reflects half of it, and guides the light reflected by the DVD medium Ds to the light receiving element Pd. The light receiving element Pd converts light into current, and reads data depending on the intensity of light.

FIG. 7 is a perspective view of a conventional optical head, and FIG. 8 is a cross-sectional view. As shown in FIG. 7, the optical head B is attached to the base 91 for attaching the collimator lens 3, and the base 91,
It has an actuator base 92 (hereinafter referred to as an act base) on which the objective lens 4 is disposed. As shown in FIG. 7, the act base 92 is not limited to this, but is fixed to the base 91 by fastening three places with screws 93 here. Of the screws 93 for fixing the act base 92, a spring 94 is attached to one screw 930 in consideration of symmetry. The act base 92 is always biased by a spring 94. The objective lens 4 is disposed by attaching the lens mounting portion 95 to the act base 92 in a state where the objective lens 4 is attached to the lens mounting portion 95.

As shown in the cross-sectional view of FIG. 8, the base 91 is formed with a large truncated spherical recess 911. In addition, the act base 92 is not limited to the projections 921 having a cut spherical shape, but here, three are formed. The curved surface of the convex portion 921 is disposed in contact with the curved surface of the concave portion 911. As shown in FIG. 8, by tightening / loosening the screw 921, the curved surface of the convex portion 921 moves while contacting the curved surface of the concave portion 911.
2 smoothly changes its inclination with respect to the base 91.

By appropriately operating the screw 931, the optical axis of the laser light emitted from the objective lens 4 is D.
After tilting the act base 92 so as to irradiate perpendicularly to the VD media Ds, an adhesive Be is applied to the base 91 and the side surface of the act base 92 to fix the act base 92 to the base 91. Thereby, the optical head B can be manufactured.

The collimator lens 3 attached to the base 91 and the objective lens 4 provided to the act base 92 are normally formed so as to be arranged at positions where laser light is irradiated vertically.
However, when the relative position between the collimator lens 3 and the objective lens 4 exceeds the allowable range due to deformation at the time of manufacture or the like, the arrangement position of the screw 93 (930, 931) or the recess 911
In addition, since the arrangement position of the convex portion 921 cannot be largely shifted, it may not be within the allowable range.

Therefore, a three-dimensional bonding method as shown in FIG. 9 may be employed. In the optical head C shown in FIG. 9, a through hole 811 is formed in the base 81. Positioning is performed using a positioning member 86 that passes through the through-hole 811. The positioning member 86 has a rectangular parallelepiped shape having two cylindrical convex portions 861 on the upper portion, and a magnet 862 is disposed between the convex portions 861. Act Base 82
Is formed with an engagement hole 821 at a position corresponding to the convex portion 861. Positioning member 8
6 is made to penetrate through the through-hole 811, the convex portion 861 of the positioning member 86 is engaged with the engagement hole 821 of the act base 82, and the positioning member 86 and the act base 82 are connected so as not to move relative to each other.

Thereafter, the positioning member 86 is moved horizontally so that the objective lens 4 disposed on the act base 82 is positioned so that the laser beam emitted from the collimator lens 3 attached to the base 81 can be properly received. The base 82 is moved. Further, by moving the positioning member 86, adjustment is made so that the optical axis of the laser beam emitted from the objective lens 4 is irradiated at right angles to the DVD medium. Thereafter, when the adjustment is completed, the adhesive Be is applied to the side surfaces of the base 81 and the act base 82, and the act base 82 is fixed to the base 81.

In the invention described in Japanese Patent Laid-Open No. 2002-42373, a fixing protrusion is passed through a fixing through hole and fixed using an adhesive to fix a stator portion and a frame body of an actuator.
JP 2002-42373 A Japanese Patent Laid-Open No. 11-39682 JP 2000-285475 A JP 2000-42373 A Japanese Patent Laid-Open No. 7-311951

However, the spherical concave portion 911 and convex portion 921 and screw 93 (930, 931)
The adhesion using the spring 94 cannot cope with a case where the arrangement location of the collimator lens 3 and the objective lens 4 is greatly deviated from the design arrangement location. Screw 93 (930, 931
), The fine adjustment is difficult and the screw 93 (930, 931) cannot be removed even after the adjustment. Moreover, it is difficult to apply the adhesive Be evenly.

Further, the method shown in FIG. 9 uses the positioning member 86 to determine the position where the act base 82 is disposed, and adheres the act base 82 and the base 81 with the adhesive Be. At this time, it is difficult to uniformly apply the adhesive Be of each part, and when the adhesive Be is not uniformly applied, the adhesive Be is contracted and stress is applied to the act base 82. The biased stress causes the act base 82 to move to a position different from the position determined by the positioning member 86 or to be fixed in a deformed state, thereby reducing the performance of the optical head.

Further, the invention described in Japanese Patent Application Laid-Open No. 2002-42373 shows that the fixing protrusion is passed through the fixing through hole and fixed using an adhesive, but from the gap between the fixing protrusion and the fixing through hole. It is a structure in which the adhesive easily flows out , and it is considered that unbalanced stress is generated by the condensation of the adhesive.

Therefore, the present invention improves the accuracy of adhesion between the base on which the collimator lens is disposed and the act base on which the objective lens is disposed, and accordingly, the optical disk can be irradiated with a laser beam having a stable intensity, and data recording or It is an object of the present invention to provide an optical head capable of suppressing reading failure and an optical disk apparatus using the optical head.

In order to achieve the above object, the present invention provides an optical disk apparatus for recording and reading data by irradiating a rotating disk-shaped optical disk with laser light, and irradiating the optical disk with laser light. The optical head includes a laser light source for irradiating a laser beam, a mirror for reflecting the laser beam emitted from the laser light source, and a laser beam reflected by the mirror in parallel. A collimator lens for converting light, a base for supporting the collimator lens, an objective lens for irradiating the optical disc with the laser light, an act base for supporting the objective lens, and light reflected by the optical disc are received. A plurality of through holes for engaging with the base are formed in the act base. The base has a stepped convex portion at a position corresponding to the through hole of the act base, and the act base is adjusted so that the inclination angle of the objective lens and the optical disk falls within a predetermined range, Engaging the through hole with the convex portion of the base;
The act base and the base are fixed by injecting an adhesive into the through hole.

According to this configuration, when the base and the act base are connected and fixed, the convex portion of the base is engaged with the through hole of the act base, and the adhesive is applied to the through hole.
The amount of adhesive applied can be made constant in each through hole.

Accordingly, it is possible to prevent generation of unnecessary and non-uniform stress on the act base due to shrinkage when the adhesive dries. By preventing uneven stress, it is possible to prevent the positional relationship between the base and the act base determined before bonding from deviating. In addition, since the non-uniform stress is not applied to the act base, the act base itself can be prevented from being deformed. Furthermore, since the optical disk can be optimally irradiated with laser light, stable data recording and reading can be performed.

To achieve the above object, the present invention provides an optical disk apparatus for recording and reading data by irradiating a rotating disk-shaped optical disk with a laser beam, and a spindle motor for rotating the optical disk; An optical head for irradiating the optical disk with laser light;
A signal processing device for processing a signal, an external connection unit for connecting a signal detected by the optical head and decoded by the signal processing device to an external video display unit, and a control unit The optical head for irradiating the optical disk with a laser light source for irradiating laser light, a mirror for reflecting the laser light, a collimator lens for making the laser light parallel light, and the like. Objective lens, a beam splitter that splits the light reflected by the optical disc, and a light receiving element that receives the light. The collimator lens is supported by a base, and the objective lens is supported by an act base. And through holes for engaging with the base are formed at the four corners of the act base, and the base has a large diameter at positions corresponding to the through holes of the act base. A stepped convex portion formed by connecting the cylindrical portion and the second cylindrical portion having a small diameter is formed, and a portion of the first cylindrical portion connected to the second cylindrical portion is recessed around the second cylindrical portion. A groove is formed, the act base is adjusted so that the inclination angle of the objective lens and the optical disk falls within a predetermined range, the through hole is engaged with the convex portion of the base, and an adhesive is attached to the through hole. The act base and the base are fixed by injecting.

According to this configuration, when the base and the act base are connected and fixed, since the adhesive stays in the concave groove of the convex portion of the base in the through hole of the act base, the adhesive flows out from the convex portion. Hateful.

Accordingly, it is possible to prevent generation of unnecessary and non-uniform stress on the act base due to shrinkage when the adhesive dries. By preventing uneven stress, it is possible to prevent the positional relationship between the base and the act base determined before bonding from deviating. In addition, since the non-uniform stress is not applied to the act base, the act base itself can be prevented from being deformed. Furthermore, since the optical disk can be optimally irradiated with laser light, stable data recording and reading can be performed.

To achieve the above object, the present invention provides an optical disk apparatus for recording and reading data by irradiating a rotating disk-shaped optical disk with a laser beam, and a spindle motor for rotating the optical disk; An optical head for irradiating the optical disk with laser light;
A signal processing device for processing a signal, an external connection unit for connecting a signal detected by the optical head and decoded by the signal processing device to an external video display unit, and a control unit The optical head includes a laser light source for irradiating laser light, a mirror for reflecting the laser light emitted from the laser light source, and a collimator lens for making the laser light reflected by the mirror parallel light A base for supporting the collimator lens, an objective lens for irradiating the optical disc with the laser light, an act base for supporting the objective lens,
A light receiving element for receiving light reflected by the optical disc, and through holes for engaging with the base are formed at the four corners of the act base, and the base penetrates the act base. A stepped convex portion is formed by connecting cylinders having different diameters at positions corresponding to the holes, and the act base is adjusted so that the inclination angle of the objective lens and the optical disk falls within a predetermined range, The act base and the base are fixed by engaging a hole with a convex portion of the base and injecting an adhesive into the through hole.

According to this configuration, since the through holes are formed at the four corners of the act base and the injection amount of the adhesive is constant, the act base is inclined due to the stress generated by the shrinkage when the adhesive dries. , Difficult to deform. Moreover, since the convex part formed in the said base is the shape which connected the cylinder of a different diameter, it can manufacture easily.

In order to achieve the above object, the present invention provides a laser light source for irradiating a laser beam, a mirror for reflecting the laser beam emitted from the laser light source, and converting the laser beam reflected by the mirror into parallel light. A collimator lens, a base supporting the collimator lens, an objective lens for irradiating the optical disc with the laser light, an act base supporting the objective lens, and a light receiving element for receiving the light reflected by the optical disc The load applied to the act base can be distributed and supported in a well-balanced manner on the act base.
A plurality of through holes for engaging with the base are formed at a position, and a stepped convex portion is formed at a position corresponding to the through hole of the act base. By adjusting the inclination angle of the objective lens and the optical disc to be within a predetermined range, engaging the through hole with the convex portion of the base, and injecting adhesive into the through hole, the act base and the convex An optical head characterized by fixing a portion is provided .

According to this configuration, when the base and the act base are connected and fixed, the convex portion of the base is engaged with the through hole of the act base, and the adhesive is applied to the through hole.
The amount of adhesive applied can be made constant in each through hole.

Accordingly, it is possible to prevent generation of unnecessary and non-uniform stress on the act base due to shrinkage when the adhesive dries. By preventing uneven stress, it is possible to prevent the positional relationship between the base and the act base determined before bonding from deviating. In addition, since the non-uniform stress is not applied to the act base, the act base itself can be prevented from being deformed. Furthermore, since the optical disk can be optimally irradiated with laser light, stable data recording and reading can be performed.

In the above structure, the through holes of the act base may be formed at four corners or substantially four corners of the act base. Moreover, although the convex part of the said base can illustrate the shape which connected the cylinder of a different diameter, it is not limited to it. The convex portion may have a shape in which columnar members having different cross-sectional shapes are connected. Moreover, the thing which can engage with the through-hole of an act base, such as a thing with a pointed tip, such as a cone and a pyramid, and a thing with a taper-like inclination, can be widely adopted.

Furthermore, a concave groove may be formed in the connecting portion of the convex portion around a connecting portion connected to the other cylinder of one cylinder having a large diameter of the convex portion. The groove can be widely used in a shape in which an adhesive easily flows, such as an arc-shaped cross section, an elliptical shape, or a rectangular shape.

According to the present invention, the accuracy of adhesion between the base on which the collimator lens is arranged and the act base on which the objective lens is arranged can be increased, and accordingly, the optical disc can be irradiated with laser light having a stable intensity, It is possible to provide an optical head capable of suppressing reading failure and an optical disk apparatus using the optical head.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a layout view of an optical disc apparatus according to the present invention. The optical disc apparatus shown in FIG.
It is a VD player. The DVD player PL shown in FIG. 1 has substantially the same configuration as the conventional DVD player PM. That is, the spindle motor S that rotates the DVD medium Ds.
p, an optical head A that irradiates light to the DVD medium Ds to read information, a decoder Dc that decodes a signal detected by the optical head A, and an external for connecting to a monitor Mn that is an external display device A connection unit Oc and a control unit Cont are provided.

The DVD player PL is controlled by the control unit Cont. When a user gives a command to play a DVD, first, the spindle motor Sp is driven to rotate the DVD medium Ds. The DVD medium Ds rotating from the optical head A is irradiated with laser light, and the reflected light is detected by the optical head A. A light receiving element Pd, which will be described later, provided in the optical head A converts detected light into an electrical signal. The electrical signal is sent to the decoder Dc, demodulated into a video signal, and monitored via the external connection portion Oc. The image is sent to Mn and displayed on the monitor Mn.

FIG. 2 shows an arrangement plan of an example of the optical head. That is, it has a laser light source Ld, a mirror Mr, a collimator lens 3, an objective lens 4, a beam splitter Bs, and a light receiving element Pd. The laser light emitted from the laser light source Ld is reflected by the mirror Mr, enters the collimator lens 3, changes into parallel light, and exits from the collimator lens 3. Collimator lens 3
The laser beam emitted from the laser beam is incident on the objective lens 4 and is irradiated onto the DVD medium Ds from the objective lens 4.

At this time, the laser beam is focused on the recording layer of the DVD medium Ds, and the optical axis and DV
Laser light is irradiated so that the recording layer of the D media Ds is perpendicular. Beam splitter B
s is a prism that transmits half of the incident laser light and reflects half of it, and guides the light reflected by the DVD medium Ds to the light receiving element Pd. The light receiving element Pd converts light into current, and reads data depending on the intensity of light.

3 is a perspective view of the optical head according to the present invention, and FIG. 4 is an exploded perspective view of the optical head shown in FIG. As shown in FIG. 3, the optical head A has a base 1 for supporting the collimator lens 3, and an act base 2 attached to the base 1 for supporting the objective lens 4.
The act base 2 is not limited thereto, but has a rectangular shape, and the through holes 2 are formed at the four corners.
1 is formed. Protrusions 11 that fit into the through holes 21 are provided at positions corresponding to the through holes 21 when the act base 2 is disposed on the base 1. In a state where the through hole 21 of the act base 2 is fitted to the convex portion 11 of the base 1, the adhesive Bd is injected into the through hole 21 to fix the act base 2 to the base 1.

As shown in FIG. 4, a lens installation hole 12 for mounting the collimator lens 3 on the base 1.
Is formed. A rectangular positioning hole 13 is formed next to the lens installation hole 12.

FIG. 10 shows an enlarged cross-sectional view of an example of a convex portion provided in the optical head shown in FIG. 3 or FIG. The convex portion 11 shown in FIG. 10 has a shape in which two cylinders having different diameters are combined, and the second convex portion having a small diameter R2 with the central axis aligned on the first convex portion 111 having a large diameter R1. Part 11
2 has the shape arranged continuously. The first convex portion 111 is the through hole 2 of the act base 2.
The cylindrical shape is slightly larger than the inner diameter of 1.

The act base 2 is formed with a lens mounting portion 5 for mounting the objective lens 4 and a light passage hole 22 through which the laser light from the collimator lens 3 enters the objective lens 4. Further, an engaging portion 23 for engaging a positioning member 6 described later is adjacent to the light passage hole 22.
Is formed. The positioning member 6 has a rectangular parallelepiped shape, and includes two engaging convex portions 61 for engaging with the engaging portion 23 of the act base 2 on the upper portion. The engaging convex portion 61 has a cylindrical shape, and a magnet 62 is disposed between the adjacent engaging convex portions 61. Positioning member 6
The engaging projection 61 is engaged with the engaging portion 23 of the act base 2 and the act base 2 is held by the magnetic force of the magnet 62.

5A to 5D are sectional views showing steps of manufacturing the optical head according to the present invention. In addition,
In FIG. 5, the direction along the paper surface indicated by the arrow is shown as the movement direction, but in reality, it can also be moved in three dimensions, in other words, in a direction away from the paper surface. As shown in FIG. 5 (A), the base 1 is horizontally arranged, and the act base 2 is placed on the upper portion of the base 1.
Is arranged so as to correspond to the convex portion 11 of the base 1. Thereafter, the positioning hole 13 of the base 1
The positioning member 6 is further penetrated, and the positioning member 6 and the act base 2 are connected. FIG.
), The positioning member 6 is moved so that the collimator lens 3 attached to the base 1 and the objective lens 4 installed on the act base 2 have a predetermined positional relationship.

At this time, the positioning member 6 is moved in a state where the act base 2 is kept parallel to the base 1. The positioning member 6 can move planarly within a range in which the second convex portion 112 formed on the base 1 can engage with the through hole 21 of the act base 2 and can also move in the height direction.
After the act base 2 is arranged on the upper portion of the base 1 by the positioning member 6, the positioning member 6 is further operated so that the laser light emitted from the objective lens 4 is a predetermined angle (here, the light) with respect to the DVD medium Ds. The act base 2 is swung so that the axis is irradiated at a right angle to the medium Ds. At this time, in other words, so that the location of the objective lens 4 is not changed,
The positioning member 6 is operated so that the act base 2 swings around the objective lens 4 (see FIG. 2).

After the position of the act base 2 is determined, the position of the positioning member 6 is fixed and the act base 2 is fixed.
After confirming that the second convex portion 112 of the base 1 is engaged with the through hole 21, the adhesive Bd is injected (see FIG. 5C). After injecting the adhesive, the positioning member 6 is fixed at the position shown in FIG. 5C until the adhesive Bd is dried. When the adhesive Bd is dried, the positioning member 6 is removed to complete (FIG. 5). (See (D)).

The through holes 21 formed in the act base 2 all have the same shape and size, and the second convex portions 112 formed in the base 1 all have the same shape and size. Further, since the act base 2 is arranged in parallel or slightly inclined with respect to the base 1, the second protrusion 112 is fitted in the through hole 21, and the adhesive Bd to be injected into each through hole 21. The injection amount is the same or substantially the same amount. Therefore, the stress generated by the shrinkage when the adhesive Bd injected into each through-hole 21 is dried and solidified is evenly applied to the act base 2, so that troubles such as movement and deformation can be prevented.

FIG. 11 shows an enlarged cross-sectional view of another example of the convex portion shown in FIG. The convex portion shown in FIG. 11 has the same shape as the convex portion shown in FIG. 10 except that the first convex portion has a concave groove, and substantially the same parts are denoted by the same reference numerals. It is. A convex portion 11B shown in FIG. 11 includes a first convex portion 113 having a large diameter R1 formed integrally with the base 1B, and a second convex portion 114 formed integrally with the first convex portion 113 and having a small diameter R2. Have. The 1st convex part 113 and the 2nd convex part 114 have the shape connected on the same axis.

A concave groove 115 is formed on the surface 1130 of the first convex portion 113 connected to the second convex portion 114 so as to surround the connecting portion with the second convex portion 114. The concave groove 115 is formed to be larger than the inner diameter of the through hole 21 of the act base 2.

When attaching the act base 2 to the base 1 </ b> B, the protrusion 11 </ b> B of the base 1 </ b> B is arranged to be inserted into the through hole 21 of the act base 2 after adjusting the inclination of the act base 2. After the convex portion 11 </ b> B is inserted into the through hole 21, the adhesive Bd is injected into the through hole 21 from the upper part of the through hole 21.

The adhesive Bd injected into the through hole 21 flows into the concave groove 115 formed like the first convex portion 113 of the convex portion 11B. Thereby, it is possible to suppress the adhesive Bd from remaining in the space 210 formed by the convex portion 11 </ b> B and the through hole 21 and flowing down from the side surface of the first convex portion 113.

As a result, the adhesion state of the adhesive Bd in each through-hole 21 formed in the act base 2 can be made substantially the same, and the stress generated by the shrinkage when the adhesive Bd dries and solidifies is the act base. Therefore, the occurrence of problems such as movement and deformation can be prevented.

In the above embodiment, the act base 2 has a rectangular shape, and the through holes 21 are formed at the four corners.
However, the present invention is not limited to this, and the shape of the act base can be widely used as long as it is arranged on the base and does not cause a problem. At this time, a wide variety of act base through holes can be widely used at positions where the load applied to the act base can be distributed and supported in a balanced manner.

In the said Example, although the convex part 11 of the base 1 demonstrated as an example what connected the cylindrical 1st convex part 111 and the 2nd convex part 112 from which a diameter differs, it is not limited to it Absent. For example, the first convex portion and the second convex portion may have different cross-sectional shapes, and the second convex portion may adopt a conical shape with a sharp tip, a tapered shape or the like that can be easily inserted into the through hole 21. it can. When the adhesive Bd is injected into the through hole 21, a material that can obtain a stable adhesion area can be widely used.

The optical head of the present invention can be applied to an optical disc apparatus that reads information by irradiating an optical disc such as a DVD, CD, or LD with laser light, or records information on a writable optical disc.

1 is a layout view of an optical disc apparatus according to the present invention. FIG. FIG. 3 is a layout diagram of an example of an optical head. 1 is a perspective view of an optical head according to the present invention. FIG. 4 is an exploded perspective view of the optical head shown in FIG. 3. FIGS. 4A to 4D are cross-sectional views of the steps for manufacturing the optical head according to the present invention. It is a schematic layout of an example of a conventional optical disk device. It is a perspective view of the conventional optical head. It is sectional drawing of the conventional optical head. It is a perspective view of the conventional optical head. It is an expanded sectional view of an example of the convex part with which the optical head shown in FIG. 3 is equipped. It is an expanded sectional view of the other example of the convex part shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 11 Convex part 111 1st convex part 112 2nd convex part 12 Lens installation hole 13 Positioning hole 11B Convex part 113 1st convex part 114 2nd convex part 2 Act base 21 Through-hole 22 Light passage hole 3 Collimator lens 4 Objective lens 5 Lens mounting part 6 Positioning member 61 Engaging convex part 62 Magnet

Claims (7)

An optical disk apparatus for recording and reading data by irradiating a rotating disk-shaped optical disk with laser light,
A spindle motor that rotates the optical disc, an optical head that irradiates the optical disc with laser light, a signal processing device that processes signals, and a signal that is detected by the optical head and decoded by the signal processing device. An external connection unit for connecting the received signal to an external video display unit, and a control unit,
The optical head includes a laser light source for irradiating a laser beam, a mirror for reflecting the laser beam, a collimator lens for collimating the laser beam, and an objective lens for irradiating the optical disc with the laser beam. And a beam splitter that splits the light reflected by the optical disc, and a light receiving element that receives the light,
The collimator lens is supported on a base, and the objective lens is supported on an act base,
Through holes for engaging with the base are formed at the four corners of the act base, and the base is provided with stepped projections connected to cylinders having different diameters at positions corresponding to the through holes of the act base. Part is formed,
The act base is adjusted so that the inclination angle of the objective lens and the optical disk is within a predetermined range, the through hole is engaged with the convex portion of the base, and the adhesive is injected into the through hole. An optical disc apparatus, wherein a base and the base are fixed. An optical disk apparatus for recording and reading data by irradiating a rotating disk-shaped optical disk with laser light,
A spindle motor that rotates the optical disc, an optical head that irradiates the optical disc with laser light, a signal processing device that processes signals, and a signal that is detected by the optical head and decoded by the signal processing device. An external connection unit for connecting the received signal to an external video display unit, and a control unit,
The optical head includes a laser light source for irradiating a laser beam, a mirror for reflecting the laser beam, a collimator lens for collimating the laser beam, and an objective lens for irradiating the optical disc with the laser beam. And a beam splitter that splits the light reflected by the optical disc, and a light receiving element that receives the light,
The collimator lens is supported on a base, and the objective lens is supported on an act base,
Through holes for engaging with the base are formed at the four corners of the act base. The base has a large diameter first cylindrical portion and a small diameter second cylinder at positions corresponding to the through holes of the act base. A stepped convex part connected with the part is formed,
A concave groove is formed around the second cylindrical portion in a portion connected to the second cylindrical portion of the first cylindrical portion,
The act base is adjusted so that the inclination angle of the objective lens and the optical disk is within a predetermined range, the through hole is engaged with the convex portion of the base, and the adhesive is injected into the through hole. An optical disc apparatus, wherein a base and the base are fixed. An optical disk apparatus for recording and reading data by irradiating a rotating disk-shaped optical disk with laser light, comprising an optical head for irradiating the optical disk with laser light,
The optical head includes a laser light source for irradiating a laser beam, a mirror for reflecting the laser beam, a collimator lens for collimating the laser beam, and an objective lens for irradiating the optical disc with the laser beam. And a beam splitter that splits the light reflected by the optical disc, and a light receiving element that receives the light,
The collimator lens is supported on a base, and the objective lens is supported on an act base,
The act base supports the load applied to the act base in a balanced manner.
A plurality of through holes for engaging with the base are formed at a position where it can be formed, and a stepped protrusion is formed at a position corresponding to the through hole of the act base on the base.
The act base is adjusted so that the inclination angle of the objective lens and the optical disk is within a predetermined range, the through hole is engaged with the convex portion of the base, and the adhesive is injected into the through hole. An optical disc apparatus, wherein a base and the base are fixed. A laser light source for irradiating a record laser light, a mirror for reflecting the laser beam, a collimator lens for collimating light the laser light, an objective lens for irradiating the laser beam on the optical disk, wherein A beam splitter that splits the light reflected by the optical disc; and a light receiving element that receives the light; the collimator lens is supported by a base; the objective lens is supported by an act base;
The act base supports the load applied to the act base in a balanced manner.
A plurality of through holes for engaging with the base are formed at a position where it can be formed, and a stepped protrusion is formed at a position corresponding to the through hole of the act base on the base.
The act base is adjusted so that the inclination angle of the objective lens and the optical disk is within a predetermined range, the through hole is engaged with the convex portion of the base, and the adhesive is injected into the through hole. An optical head, wherein a base and the convex portion are fixed. The optical head according to claim 4, wherein the through holes of the act base are formed at four corners or substantially four corners of the act base. 5. The convex portion of the base has a shape in which cylinders having different diameters are connected.
Alternatively, the optical head according to claim 5. 7. The method according to claim 4, wherein the connecting portion of the convex portion is formed with a concave groove around a connecting portion connected to the other cylinder of the one cylinder having a large diameter of the convex portion. The optical head according to crab.

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