JPH11203713A - Optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To converge a laser beam transmitted from each laser diode on the recording surface of CD or DVD by a simple structure in an optical pickup corresponding to the CD and DVD provided with plural numbers of laser diodes. SOLUTION: This pickup is provided with more than two laser diodes 1, 2 transmitting laser beams having different wavelengths, a reflection mirror 9 rotating its reflection surface 9a in the direction confronting the laser diodes 1, 2 and reflecting the laser beam to an objective lens 8, a diameter adjusting means 7 for adjusting the diameter of a laser beam transmitted from the laser diodes 1, 2 according to the wavelength of the laser beam and a rotating means for rotating the reflection mirror 9 about the optical axis of the objective lens 8 in the direction in which the reflection surface 9a confronts the laser diodes 1, 2. By rotating the reflection mirror 9 by the rotating means and making the reflection surface 9a of the reflection mirror 9 confront the respective laser diodes 1, 2, the laser beam is converged on the recording surface of CD or DVD.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical pickup for performing recording and reproduction on an optical disk.

[0002]

2. Description of the Related Art Conventionally, as an optical disk, a CD (Comp
act Disc) and DVD (Digital Video Disc). For recording and reproduction on a CD, the wavelength is 78.
A laser beam of 0 nm is used, and a laser beam having a wavelength of 650 to 635 nm is used for recording and reproduction on DVD. For this reason, a single optical disk drive uses CD and D
In order to perform recording and reproduction with respect to both the VD and the VD, the optical pickup used in the optical disk drive needs to be provided with two types of laser diodes that emit laser beams having different wavelengths.

Therefore, an optical pickup of an optical disk drive capable of recording and reproducing data on both a CD and a DVD has a characteristic of transmitting a laser beam of a certain wavelength and reflecting a laser beam of another wavelength. An optical element such as a dichroic prism is provided in an optical path to switch a laser beam used for recording and reproduction. The structure of such an optical pickup will be described with reference to FIG.

This optical pickup emits a laser beam having a wavelength of 780 nm and mounts a hologram and a light receiving element. The first laser diode 1 emits a laser beam having a wavelength of 650 nm and mounts a hologram and a light receiving element. A second laser diode 2.
Further, collimator lenses 3 and 4, a dichroic lens 5, a reflection mirror 6, a phase difference filter 7, and an objective lens 8 are arranged on the optical path of the laser light emitted from the first and second laser diodes 1 and 2. ing. The phase difference filter 7 has a phase difference filter film 7a on one surface of a glass plate.
Is formed, and an aperture 7b is formed in the center thereof. The phase difference filter film 7a has a property of transmitting a laser beam having a wavelength of 650 nm but not transmitting a laser beam having a wavelength of 780 nm. The objective lens 8 is a DV
D compatible.

When recording / reproducing on a CD, a laser beam is emitted from the first laser diode 1, this laser beam is transmitted through the collimator lens 3, is reflected at right angles by the dichroic prism 5, and is reflected by the reflection mirror 6. To the reflection surface 6a. The incident laser light is reflected by the reflection surface 6a.
Is reflected in the direction of the objective lens 8 and passes through the phase difference filter 7. At this time, the laser beam passes only through the aperture 7b and is incident on the objective lens 8, and the outer diameter of the laser beam is cut by the phase difference filter film 7a. Then, the laser beam whose outer diameter is cut by the phase difference filter 7 is transmitted through the objective lens 8 and collected, so that a good spot is formed on the recording surface of the CD, and recording and reproduction are performed. .

On the other hand, when recording / reproducing on a DVD, a laser beam is emitted from the second laser diode 2 and this laser beam passes through the collimator lens 4 and the dichroic prism 5 and is reflected by the reflection mirror 6. The light is incident on the surface 6a. The incident laser light is reflected by the reflection surface 6a in the direction of the objective lens 8, passes through the phase difference filter 7, and enters the objective lens 8. Then, the laser light transmitted through the objective lens 8 is collected, a spot is formed on the recording surface of the DVD, and recording and reproduction are performed.

[0007]

However, the above-described optical pickup has the following problems.

First, by providing the dichroic prism 5 on the optical path of the laser light, the optical path length becomes longer, and it becomes difficult to reduce the size of the optical pickup.

The use of the dichroic prism 5 increases the number of optical elements in the optical path, thereby lowering the light use efficiency and deteriorating the spot wavefront.

When the dichroic prism 5 is used in a finite optical system, the dichroic prism 5 has an angle dependency, and the wave front is likely to be deteriorated at the outer periphery of the beam.

Further, in an optical element such as the dichroic prism 5, only two types of laser light can be switched depending on the wavelength. For this reason, when a short wavelength laser such as a blue laser is put to practical use in the future and three or more kinds of laser beams are to be switched, the one using the dichroic prism 5 cannot be used.

The provision of the phase difference filter 7 between the reflection mirror 6 and the objective lens 8 increases the height of the optical pickup.

Accordingly, an object of the present invention is to provide an optical pickup which can solve each of the above-mentioned problems.

[0014]

According to a first aspect of the present invention, there is provided an optical pickup, comprising: two or more laser diodes for emitting laser beams having different wavelengths; A reflection mirror that reflects the laser light emitted from these laser diodes toward the objective lens, and a beam diameter adjusting unit that adjusts the beam diameter of the laser light emitted from the laser diode according to the wavelength of the laser light, Turning means for turning the reflection mirror around the optical axis of the objective lens in a direction in which the reflection surface faces the laser diode.

Therefore, in this optical pickup, when the optical disk to be used is a CD or a DVD, laser beams having different wavelengths are emitted from different laser diodes according to the optical disk. At this time, the reflecting mirror is turned by the turning means, and the reflecting surface of the reflecting mirror is directed toward the laser diode that emits the laser light. The laser beam reflected in the direction of the lens and reflected by the reflecting surface is adjusted in beam diameter by the beam diameter adjusting means and collected by the objective lens, and a good spot is formed on the recording surface on the CD or DVD. You.

According to a second aspect of the present invention, in the optical pickup according to the first aspect of the present invention, the reflecting mirror is a cylindrical reflecting mirror having an outer diameter formed in a cylindrical shape. The cylindrical reflection mirror was rotatably fitted in a mounting recess formed in the housing so that the central axis was rotated in alignment with the optical axis of the objective lens.

Accordingly, the cylindrical reflecting mirror has a cylindrical outer diameter, and the number of dimensional control points when the cylindrical reflecting mirror is formed is reduced. Further, the shape of the mounting concave portion of the housing into which the cylindrical reflecting mirror is rotatably fitted can also be formed in a cylindrical shape, and the number of dimensional control points when forming the cylindrical mounting concave portion is reduced. Therefore, the cylindrical reflection mirror and the mounting recess can be easily formed at low cost.

According to a third aspect of the present invention, in the optical pickup according to the second aspect of the present invention, the rotating means radially connects the S-N pole with the flange-shaped member attached to the outer peripheral portion of the cylindrical reflecting mirror. The magnet includes a magnet which is magnetized and is attached to a surface of the flange-shaped member facing the housing, and a coil which is attached to a surface of the housing facing the magnet.

Therefore, by energizing the coil, the cylindrical reflecting mirror rotates together with the flange member and the magnet according to Fleming's left hand rule, and the reflecting surface of the cylindrical reflecting mirror emits laser light. In the direction of.

According to a fourth aspect of the present invention, in the optical pickup according to the third aspect of the present invention, an elastic support attached to an outer peripheral portion of the flange-shaped member, and an engaging body provided at a distal end of the elastic support. And a plurality of engaged bodies provided on the housing, wherein the engaged bodies resiliently engage with each other; and a plurality of engaged bodies provided on the engaged bodies and the engaged bodies, the engagement between the engaged bodies and the engaged bodies. And an electrode terminal that is turned on at the time of connection.

Therefore, when the cylindrical reflecting mirror is turned by the turning means, the elastic support is turned integrally with the cylindrical reflecting mirror, and at a predetermined turning position, the elastic support is moved to the tip of the elastic support. The provided engaging body and the engaged body provided on the housing are engaged with each other. When the engaging body and the engaged body are engaged,
The electrode terminals of the engaging body and the electrode terminals of the engaged body are in a conducting state, and it is detected that the cylindrical reflection mirror has been rotated to a position where the engaging body and the engaged body are engaged.

According to a fifth aspect of the present invention, in the optical pickup according to the third aspect of the present invention, there is provided a flange-shaped magnet mold in which a flange-shaped member and a magnet are integrated, and the flange-shaped magnet mold is used as a cylindrical reflection mirror. Attached to the outer periphery.

Therefore, the cost reduction and the reduction in thickness can be achieved by making the flange-shaped member and the magnet, which were two parts, into one part. Further, when the flange-shaped magnet mold is attached to the outer peripheral portion of the cylindrical reflecting mirror, the outer peripheral surface of the cylindrical reflecting mirror is hardly damaged.

According to a sixth aspect of the present invention, in the optical pickup according to the first aspect of the present invention, the reflecting mirror is a flat plate formed on a cylindrical magnet mold in which S and N poles are magnetized along the circumferential direction on the outer peripheral surface of the cylindrical portion. The rotating means includes a cylindrical mirror mold and a coil provided at a position facing the outer peripheral surface of the cylindrical portion of the cylindrical magnet mold.

Accordingly, by energizing the coil, the reflection mirror is rotated by Fleming's left-hand rule, and the reflection surface of the reflection mirror is directed toward the laser diode that emits laser light. Further, by making the cylindrical magnet mold hollow, the weight of the reflection mirror can be reduced.

According to a seventh aspect of the present invention, in the optical pickup of the first aspect, the beam diameter adjusting means is a phase difference filter film having an aperture provided on a reflection surface of a reflection mirror.

Therefore, by providing the retardation film having the aperture on the reflection surface of the reflection mirror, the beam diameter of the laser light incident on the objective lens is adjusted according to the wavelength of the laser light. In addition, there is no need to separately provide a space for installing the beam diameter adjusting means, and the optical pickup is reduced in size.

According to an eighth aspect of the present invention, in the optical pickup of the first aspect, the beam diameter adjusting means is a phase difference filter film having an aperture provided on the lower surface, the upper surface, or inside the objective lens. is there.

Therefore, by providing the phase difference filter film having the aperture on the lower surface, the upper surface, or inside the objective lens, the beam diameter of the laser light incident on the objective lens is adjusted according to the wavelength of the laser light. . In addition, there is no need to separately provide a space for installing the beam diameter adjusting means, and the optical pickup is reduced in size.

According to a ninth aspect of the present invention, in the optical pickup according to the second aspect of the present invention, the rotating means includes a flange-shaped member attached to an outer peripheral portion of the cylindrical reflecting mirror, and the rotating means is held by the flange-shaped member. A coil, a magnetic piece provided at the center of the coil, and a plurality of magnets provided on the housing so as to face the coil and the magnetic piece.

Therefore, by energizing the coil, the cylindrical reflecting mirror rotates together with the flange member and the magnet according to Fleming's left-hand rule, and the reflecting surface of the cylindrical reflecting mirror emits laser light. In the direction of. Also, the magnetic force acting between the magnetic piece and the magnet prevents the cylindrical reflection mirror from rising. Further, the cylindrical reflecting mirror is reliably stopped at a predetermined stop position by the magnetic force acting between the magnetic piece and the magnet.

According to a tenth aspect of the present invention, in the optical pickup according to the first aspect of the present invention, the rotating means includes a reflecting mirror holder on which a reflecting mirror is mounted, and the rotating mirror being aligned with an optical axis of the reflecting mirror. A guide shaft provided in the reflection mirror holder, a holding recess formed in the housing so as to rotatably hold the guide shaft, and formed at a position in the housing facing the lower surface of the reflection mirror holder. A plurality of housing recesses, a plurality of spheres rotatably housed in these housing recesses and abutting against the lower surface of the reflection mirror holder, a coil mounted on the lower surface of the reflection mirror holder, And a plurality of magnets provided in the housing so as to face these coils and the magnetic pieces.

Therefore, by energizing the coil, the reflecting mirror rotates together with the reflecting mirror holder according to Fleming's left-hand rule, and the reflecting surface of the reflecting mirror is directed toward the laser diode that emits laser light. Since the reflecting mirror holder is supported by the sphere and rotates, the frictional force at the time of rotation is reduced, and the reflecting mirror holder rotates smoothly. Also, due to the magnetic force acting between the magnetic piece and the magnet,
Floating of the reflection mirror holder is prevented. further,
By the magnetic force acting between the magnetic piece and the magnet, the cylindrical reflection mirror is reliably stopped at a predetermined stop position.

According to an eleventh aspect of the present invention, in the optical pickup of the first aspect, the laser light emitted from the laser diode is positioned on an optical path where the laser light is incident on the reflection surface and rotates integrally with the reflection mirror. A collimator lens is provided.

Therefore, when the reflecting mirror is rotated to turn the reflecting surface of the reflecting mirror toward the laser diode for emitting the laser light, the collimator lens rotates together with the reflecting mirror, and the collimator lens always operates the laser light. Is located on the optical path of the laser light emitted from the laser beam and incident on the reflection surface. Therefore, the laser light emitted from any of the laser diodes passes through this collimator lens, then enters the reflection surface of the reflection mirror, and is reflected toward the objective lens.

[0036]

FIG. 1 shows a first embodiment of the present invention.
It will be described based on. The same parts as those described in FIG. 17 are denoted by the same reference numerals. This optical pickup emits a laser beam with a wavelength of 780 nm and mounts a hologram and a light receiving element, and a second laser diode that emits laser light with a wavelength of 650 nm and mounts a hologram and a light receiving element. And a laser diode 2. Further, on the optical path of the laser light emitted from the first and second laser diodes 1 and 2, collimator lenses 3 and 4, a reflection mirror 9, a phase difference filter 7 as a beam diameter adjusting means, and an objective lens 8 are provided. Are located. The phase difference filter 7 is provided with a phase difference filter film 7a on one surface of a glass plate, and an aperture 7 at the center thereof.
b, and the phase difference filter film 7a is 650n
It has the property of transmitting laser light having a wavelength of m but not transmitting laser light having a wavelength of 780 nm. Therefore, the beam diameter of the laser beam having a wavelength of 780 nm incident on the objective lens 8 is reduced by the phase difference filter 7.

The reflecting mirror 9 is provided so as to be rotatable around the optical axis of the objective lens 8 by a rotating means (not shown). Further, the turning means is provided with a stopping mechanism for stopping the turning of the reflecting mirror 9 at a position where the reflecting surface 9a of the reflecting mirror 9 faces the first laser diode 1 or the second laser diode 2.

FIG. 1 shows a state in which recording and reproduction are performed on a DVD in such a configuration.
Are directed in the direction of the second laser diode 2. When laser light is emitted from the second laser diode 2, the laser light passes through the collimator lens 4 and becomes parallel light, and is reflected by the reflection mirror 9 toward the objective lens 8. The reflected laser light is applied to the phase difference filter 7.
And the light is collected by the objective lens 8 to form a spot on the recording surface of the DVD, and recording and reproduction are performed.

In this optical pickup, when using a CD instead of a DVD, the reflecting mirror 9 is turned by turning means, and the reflecting surface 9a of the reflecting mirror 9 is directed toward the first laser diode 1. And the reflection mirror 9
The laser light is emitted from the first laser diode 1 after the reflection surface 9a of the first laser diode faces the direction of the first laser diode 1.

The laser light emitted from the first laser diode 1 passes through the collimator lens 4 to become parallel light, and is reflected by the reflection mirror 9 toward the objective lens 8.
The beam diameter of the reflected laser light is reduced by the phase difference filter 7. Then, the laser beam whose beam diameter has been reduced is
The light is collected by the objective lens 8 to form a spot on the recording surface of the CD, and recording and reproduction are performed.

Here, in the optical pickup of the present embodiment, the reflecting mirror 9 is rotated to rotate the reflecting mirror 9.
Of the dichroic prism 5 in the optical path of the laser light as in the conventional optical pickup shown in FIG. There is no need to provide an optical element. Therefore, the size of the optical pickup can be reduced.

Further, since the number of optical elements in the optical path of the laser beam is reduced, the light use efficiency is increased and a good spot wavefront can be obtained.

Further, it is possible to prevent the spot wavefront deterioration due to the angle dependence which occurs when the dichroic prism 5 is used in the finite optical system.

Further, in an optical element such as the dichroic prism 5, only two types of laser light can be switched according to the wavelength. However, according to the method of rotating the reflection mirror 9, three or more laser diodes are used. Can also be provided.

Next, a second embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. The same parts as those described in FIG. 1 are denoted by the same reference numerals (the same applies hereinafter).
The optical pickup according to the present embodiment is different from the prismatic reflecting mirror 9 described in FIG.
Is used. The cylindrical reflecting mirror 10 has a cylindrical outer diameter and a reflecting surface 10a formed at one end thereof.

A mounting recess 12 is formed in a housing 11 of the optical pickup. The mounting recess 12 is formed in a cylindrical shape, and the other end side of the cylindrical reflecting mirror 10 is rotatably fitted into the mounting recess 12. The lens rotates in accordance with the optical axis of the lens 8. Also, on the bottom surface of the mounting recess 12,
A slider washer 13 is inserted.

On the outer periphery of the cylindrical reflecting mirror 10,
Donut-shaped collar member 14 formed of a magnetic material such as iron
Has been fixed. On the lower surface of the collar member 14, S ·
A donut-shaped magnet 15 whose N pole is radially magnetized is fixed.

A doughnut-shaped magnetic plate 16 is fixed to the periphery of the mounting recess 12 in the housing 11, and a plurality of coils 17 are mounted on the upper surface of the magnetic plate 16. When the other end of the cylindrical reflection mirror 10 on which the flange member 14 and the magnet 15 are mounted is fitted into the mounting recess 12, the magnet 15 moves up and down with respect to the magnetic plate 16 and the coil 17. Opposing in the direction. The flange 14, the magnet 15, and the coil 17 form a rotation unit 18 for rotating the cylindrical reflection mirror 10 around the optical axis of the objective lens 8.

One stopper projection 19 extending in the radial direction is fixed to the outer peripheral portion of the collar member 14.
Two stoppers 20a and 20b are fixed to the outer peripheral portion of the magnetic plate 16 in the housing 11 at a predetermined angle.

In such a configuration, the collar member 1
The other end of the cylindrical reflecting mirror 10 on which the magnet 4 and the magnet 15 are mounted is fitted in the mounting recess 12, and the magnet 15 faces the coil 17. When the coil 17 is energized from this state, the cylindrical reflecting mirror 10 rotates around the central axis according to Fleming's left-hand rule.
When the direction of the current flowing through the coil 17 is changed, the rotating direction of the cylindrical reflecting mirror 10 is reversed.

When the cylindrical reflecting mirror 10 is rotated by a predetermined angle, the stopper projection 19 is moved to one of the stoppers 20.
a, 20b, the turning operation of the cylindrical reflecting mirror 10 is restricted.

When the stopper projection 19 comes into contact with one of the stoppers 20a, the reflecting surface 10a faces in the direction facing the first laser diode 1 (see FIG. 1), and the stopper projection 19 contacts the other stopper 20b. When contact is made, the reflection surface 10a faces the direction facing the second laser diode 2 (see FIG. 1).

Here, the cylindrical reflecting mirror 10 has a cylindrical outer diameter, and when the cylindrical reflecting mirror 10 is formed, the rectangular reflecting mirror 9 as shown in FIG. 1 is formed. In comparison, the number of dimensional control locations is reduced. In addition, the shape of the mounting recess 12 formed in the housing 11 can also be a columnar shape, and the number of dimension control locations when forming the mounting recess 12 is reduced. For this reason, the cylindrical reflection mirror 10 and the mounting recess 12 can be easily formed at low cost.

Further, since the rotating means 18 is formed by the flange member 14, the magnet 15, and the coil 17, the space for providing the rotating means 18 can be reduced, and the size of the optical pickup can be reduced. Can be planned.

A magnetic force acts between the magnetic plate 16 fixed to the housing 11 and the magnet 15 fixed to the flange member 14, and the magnetic force acts on the cylindrical reflection mirror 1
0 is prevented from rising. Therefore, it is possible to prevent the inclination of the laser beam incident on the objective lens 8, which is caused by the lifting of the cylindrical reflection mirror 10, and to form a good spot on the recording surface of the CD or DVD.

Further, since the cylindrical reflecting mirror 10 is rotated on the basis of the outer diameter, the center axis of the cylindrical reflecting mirror 10 is maintained constant, and there is no optical axis shift and a good signal with a small offset is detected. be able to.

Further, the stopper projection 19 and the stopper 20
With the simple structure provided with the first and second laser diodes 2, the reflecting surface 10a of the cylindrical reflecting mirror 10 can be reliably stopped at a position facing the first laser diode 1 or the second laser diode 2.

Next, a third embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. In the optical pickup of the present embodiment, a donut-shaped flange member 14 is fixed to the outer peripheral portion of the cylindrical reflecting mirror 10, and the end of the cylindrical reflecting mirror 10 is rotatably fitted to the housing 11. An attachment recess 12 (see FIGS. 2 and 3) is formed. A rod-shaped elastic support 21 is attached to the outer periphery of the flange-shaped member 14, and an engaging body 22 is fixed to a distal end of the elastic support 21. On the other hand, the housing 11
2 engaged members 23a and 23b which are engaged with and disengageable from
Has been fixed.

The engaging body 22 and the engaged bodies 23a, 2
3b includes these engaging bodies 22 and engaged bodies 23a, 2a.
There are provided electrode terminals 24 and 25 which are turned on when they are engaged with 3b. Electrode terminal 2 of engaged members 23a and 23b
5 includes a power supply 26, a resistor 27, a detection circuit 28, a CPU 2
9 are connected. Note that a resistor 27 having a different resistance value is connected to the electrode terminal 25 of one engaged body 23a and the electrode terminal 25 of the other engaged body 23b.

In this configuration, when the coil 17 is energized, the cylindrical reflecting mirror 10 rotates around the central axis according to Fleming's left-hand rule. Coil 17
When the direction of the current flowing through the mirror is changed,
Is reversed.

When the cylindrical reflecting mirror 10 rotates by a predetermined angle, the engaging body 22 is moved to one of the engaged bodies 23a, 23a.
b. Then, by this engagement, the electrode terminals 24 of the engagement body 22 and the electrode terminals 25 of the engagement bodies 23a and 23b are formed.
Are turned on, the detection circuit 28 detects that a current has flowed through the resistor 27, and the control of the CPU 29 based on the detection result by the detection circuit 28 cuts off the current to the coil 17.

When the engaging member 22 and the engaged member 23a are engaged with each other, the reflecting surface 10a of the cylindrical reflecting mirror 10 is
Faces the first laser diode 1 (see FIG. 1), and when the engaging body 22 and the engaged body 23b are engaged, the reflecting surface 10a faces the second laser diode 2 (see FIG. 1). Turn in the direction you want to. Which of the engaged bodies 23a and 23b the engaging body 22 has engaged with is determined by the resistance 2
7 can be detected.

Here, when the cylindrical reflecting mirror 10 is rotated to a predetermined position, the engaging member 22 and the engaged members 23a, 23b
Are engaged, and the electrode terminals 24 and 25 are turned on. Therefore, it is possible to reliably detect that the cylindrical reflection mirror 10 has been rotated to the predetermined position. Then, by energizing the coil 17 according to the detection result,
It is possible to prevent the coil 17 from being energized even after the cylindrical reflection mirror 10 rotates to a predetermined position, so that power consumption is not wasted and heat from the coil 17 can be prevented.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
It will be described based on. The optical pickup according to the present embodiment has a flange magnet mold 30 in which the flange member 14 and the magnet 15 described in FIG.
This flange-shaped magnet mold 30 is attached to the outer periphery of the cylindrical reflection mirror 10. The housing 11 has a mounting recess 12 formed therein.
2, the end of the cylindrical reflection mirror 10 is rotatably fitted.

A donut-shaped magnetic plate 16 is fixed to a peripheral portion of the mounting recess 12 in the housing 11, and a plurality of coils 17 are mounted on the upper surface of the magnetic plate 16.

In such a configuration, the cost reduction and the thickness reduction can be achieved by forming the flange-shaped magnet mold 30 in which the flange-shaped member 14 and the magnet 15 which are two parts are integrated. A flange-shaped magnet mold 30 in which the flange-shaped member 14 and the magnet 15 are integrated.
Is formed, it is possible to prevent resonance when the objective lens driving device and the seek motor are driven. further,
This flange-shaped magnet mold 30 is connected to the cylindrical reflection mirror 1.
When it is attached to the outer periphery of the cylindrical reflection mirror 10, the outer peripheral surface of the cylindrical reflection mirror 10 is hardly damaged.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
It will be described based on. In the optical pickup of the present embodiment, the reflecting mirror 31 has a cylindrical magnet mold 32 in which S and N poles are magnetized along the circumferential direction on the outer peripheral surface of the cylindrical portion;
It is formed by a flat plate reflection mirror 33 fixed to one end side.

The housing 11 has a mounting recess 12 formed in a columnar shape and a semicircular holding wall 34 erected at the periphery of the mounting recess 12. A magnetic plate 35 is inserted into the bottom of the mounting recess 12, and the other end of the cylindrical magnet mold 32 is rotatably fitted in the mounting recess 12. The surface of the holding wall 34 facing the cylindrical magnet mold 32 has a coil 3
6 is attached. The cylindrical magnet mold 32 and the coil 36 form a turning means 37 for turning the reflection mirror 31 around the optical axis of the objective lens 8.

A stopper projection (not shown) is fixed to the outer peripheral surface of the cylindrical magnet mold 32, and two stoppers (not shown) are fixed to the housing 11 at positions abutting the stopper projection. I have.

In such a configuration, the lower end of the cylindrical magnet mold 32 is fitted into the mounting recess 12, and the coil 36 is energized. Then, the reflection mirror 31 rotates around the central axis according to Fleming's left-hand rule,
At the position where the stopper protrusion comes into contact with the stopper and the rotation is restricted, the reflection surface 31a of the reflection mirror 31 is moved to the first position.
Laser diode 1 or second laser diode 2 (FIG. 1)
Reference).

Here, it is necessary to form the reflection mirror 31 by a hollow cylindrical magnet mold 32 and a flat plate reflection mirror 33, and to attach a flange member or a magnet to the outer periphery of the cylindrical magnet mold 32. Therefore, the weight and size of the reflection mirror 31 can be reduced. Then, by reducing the weight of the reflection mirror 31, the current flowing through the coil 36 for rotating the reflection mirror 31 can be reduced, and the number of the coils 36 can be reduced.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
It will be described based on. In the optical pickup according to the present embodiment, as a beam diameter adjusting unit, the surface of the flat plate reflecting mirror 33 described with reference to FIG.
A phase difference filter film 38a having an aperture 38b is provided. A reflection film 39 of aluminum or the like is deposited on the surface of the flat plate reflection mirror 33 opposite to the surface on which the phase difference filter film 38a is provided.

In such a configuration, the phase difference filter film 3 having the aperture 38b as a beam diameter adjusting means is provided.
By providing the plate reflection mirror 8a on the plate reflection mirror 33, the beam diameter of the laser light reflected by the plate reflection mirror 33 and incident on the objective lens 8 (see FIG. 1) is adjusted according to the wavelength of the laser light.

By providing the phase difference filter film 38a having the aperture 38b on the flat plate reflection mirror 33, as shown in FIG. 1, a beam diameter adjusting means between the reflection mirror 9 and the objective lens 8 is provided. There is no need to provide the phase difference filter 7, and the size of the optical pickup can be reduced.

Next, a seventh embodiment of the present invention will be described with reference to FIG.
It will be described based on. In the optical pickup of the present embodiment, a phase difference filter film 40a having an aperture 40b in the center is provided as a beam diameter adjusting means on the lower surface of the objective lens 8 facing the reflection mirror 9 (see FIG. 1). .

In such a configuration, the phase difference filter film 4 having the aperture 40b as a beam diameter adjusting means is provided.
By providing Oa on the lower surface of the objective lens 8, the beam diameter of the laser light passing through the objective lens 8 is adjusted according to the wavelength of the laser light.

Further, by providing the phase difference filter film 40a having the aperture 40b on the lower surface of the objective lens 8, as shown in FIG. Therefore, it is not necessary to provide the phase difference filter 7, and the size of the optical pickup can be reduced.

Further, by providing the phase difference filter film 40a having the aperture 40b on the lower surface of the objective lens 8, the optical axis of the objective lens 8 does not deviate from the optical axis of the aperture 40b. A spot formed on the recording surface has no aberration, and a good signal can be detected.

In the present embodiment, the aperture 40
Although the case where the phase difference filter film 40a having the aperture b is provided on the lower surface of the objective lens 8 has been described as an example, the phase difference filter film 40a having such an aperture 40b is connected to the objective lens 8 as shown in FIG. May be provided inside the
Alternatively, it may be provided on the upper surface of the objective lens 8 as shown in FIG.

Next, an eighth embodiment of the present invention will be described with reference to FIG.
2 will be described. In the optical pickup of the present embodiment, a donut-shaped flange member 41 is attached to the outer periphery of the cylindrical reflection mirror 10, and the center axis of the cylindrical reflection mirror 10 is pointed on the outer periphery of the collar member 41. Are formed at two positions. A coil 43 is held at the tip of the holding projection 42, and a magnetic piece 44 is fixed to the center of the coil 43.

The housing 11 has a cylindrical reflection mirror 1
0 is formed so that the lower end of the mounting recess 12 is rotatably fitted thereto.
Four magnets 45a and 45b are fixed at intervals of ゜.

The flange member 41, the coil 43, the magnetic piece 44, and the magnets 45a, 45b form a rotation means 46 for rotating the cylindrical reflection mirror 10 around the optical axis of the objective lens 8. ing.

In such a configuration, when the coil 43 and the magnet 45a face each other in the vertical direction, a magnetic force acts between the magnetic piece 44 and the magnet 45a, and the cylindrical reflection mirror 10 does not rotate. Has stopped. At this time, the reflecting surface 10a of the cylindrical reflecting mirror 10 is oriented in a direction facing the first laser diode 1 (see FIG. 1).

In this state, when a pulse voltage is applied to the coil 43 to cause a current to flow, the cylindrical reflecting mirror 10 rotates around the central axis according to Fleming's left-hand rule. When the coil 43 approaches the position above the magnet 45b, the rotation of the cylindrical reflection mirror 10 is stopped by the magnetic force acting between the magnet 45b and the magnetic piece 44. At this time, the reflection surface 10a of the cylindrical reflection mirror 10 is directed in a direction facing the second laser diode 2 (see FIG. 1). Therefore, the position of the cylindrical reflecting mirror 10 can be reliably fixed at a position where the reflection surface 10a faces the first laser diode 1 or the second laser diode 2.

Further, the magnetic piece 44 and the magnet 45a,
45b, the cylindrical reflecting mirror 1
0 is prevented from rising. Therefore, it is possible to prevent the inclination of the laser beam incident on the objective lens 8, which is caused by the lifting of the cylindrical reflection mirror 10, and to form a good spot on the recording surface of the CD or DVD.

When the optical pickup seeks, acceleration occurs in the cylindrical reflecting mirror 10, but the coil 43 is symmetrically arranged with respect to the rotation axis of the cylindrical reflecting mirror 10, so that the rotational direction shifts. Does not occur.

Further, since the voltage applied to the coil 43 is a pulse voltage, heat generation from the coil 43 can be prevented and power consumption can be reduced.

Next, a ninth embodiment of the present invention will be described with reference to FIG.
3 and FIG. In the optical pickup of the present embodiment, a disk-shaped reflection mirror holder 47 is provided, and the reflection mirror 9 is fixed to the upper surface of the reflection mirror holder 47. A guide shaft portion 48 that coincides with the optical axis of the reflection mirror 9 is provided at a central portion on the lower surface side of the reflection mirror holder 47. Also, the reflection mirror holder 47
Two coils 49 are fixed to the outer peripheral edge on the lower surface side of the slab at a position where the guide shaft 48 is symmetrical. Coil 49
A magnetic piece 50 is fixed to the center of the.

On the other hand, the housing 11 of the optical pickup is formed with a holding concave portion 51 for holding the guide shaft portion 48 rotatably around its axis. Further, a plurality of receiving recesses 52 are formed opposite to the lower surface of the reflection mirror holder 47 and located at equal intervals on the same circumference centering on the holding recess 51. A steel ball 53, which is a sphere, is rotatably housed in these housing recesses 52, and the upper end of the steel ball 53 is in contact with the lower surface of the reflection mirror holder 47. Also, when the guide shaft portion 48 is rotatably held by the holding concave portion 51, four magnets 5 arranged at 90 ° intervals on the circumference of the housing 11 facing the coil 49 are provided.
4a and 54b are fixed. The reflection mirror holder 47, the guide shaft 48, and the holding recess 51
, Accommodation recess 52, steel ball 53, coil 4
9, a magnetic piece 50, and magnets 54a and 54b form a turning means 55 for turning the cylindrical reflection mirror 10 around the optical axis of the objective lens 8.

In such a configuration, when the coil 49 and the magnet 54a face each other in the vertical direction, a magnetic force acts between the magnetic piece 50 and the magnet 54a, and the reflection mirror holder 47 does not rotate. Has stopped. At this time, the reflection surface 9a of the reflection mirror 9 is oriented in a direction facing the first laser diode 1 (see FIG. 1).

In this state, when a pulse voltage is applied to the coil 49 to cause a current to flow, the reflection mirror holder 47 rotates around the axis of the guide shaft 48 according to Fleming's left-hand rule. When the coil 49 approaches the position above the magnet 54b, the rotation of the reflection mirror holder 47 is stopped by the magnetic force acting between the magnet 54b and the magnetic piece 50. At this time, the reflection surface 9a of the reflection mirror 9 is directed in a direction facing the second laser diode 2 (see FIG. 1). Therefore, the cylindrical reflecting mirror 10 is moved to the reflecting surface 1.
The position can be reliably fixed at a position where 0a faces the first laser diode 1 or the second laser diode 2.

Further, the magnetic piece 50 and the magnets 54a,
The floating of the reflection mirror 9 is prevented by the magnetic force acting between the reflection mirror 9 and the reflection mirror 9. Therefore, the inclination of the laser light incident on the objective lens 8 which is caused by the lifting of the reflection mirror 9 is prevented, and a good spot can be formed on the recording surface of the CD or DVD.

Since the steel ball 53 is provided between the housing 11 and the reflection mirror holder 47, the frictional force when rotating the reflection mirror holder 47 is reduced, and the voltage is applied to the coil 49. The size and thickness of the magnetic circuit can be reduced.

In the present embodiment, the case where two coils 49 are fixed to the lower peripheral edge of the reflection mirror holder 47 has been described as an example, but FIG. As shown, a coil 56 having a spiral pattern formed on a flexible PC board may be used. By using such a coil 56, the thickness of the optical pickup can be reduced.

Next, a tenth embodiment of the present invention will be described with reference to FIG. In the optical pickup according to the present embodiment, a donut-shaped flange member 57 is attached to the outer peripheral portion of the cylindrical reflection mirror 10.
Is provided so as to be rotatable around the central axis together with the collar member 57. One holding projection 58 is formed on the collar member 57, and a collimator lens 59 is fixed to the tip of the holding projection 58. This collimator lens 59 is
The laser light emitted from the first and second laser diodes 1 and 2 is arranged on an optical path where the laser light is incident on the reflection surface 10a.

In such a configuration, when the reflecting surface 10a of the cylindrical reflecting mirror 10 faces in the direction facing the second laser diode 2, the collimator lens 59
It is located on the optical path of the laser light emitted from the second laser diode 2 and incident on the reflection surface 10a. Therefore, the second
The laser light emitted from the laser diode 2 passes through the collimator lens 59 and becomes parallel light, and is reflected toward the objective lens 8 by the reflecting surface 10a of the cylindrical reflecting mirror 10.

In this state, the cylindrical reflecting mirror 10 is rotated to turn the reflecting surface 10a in a direction facing the first laser diode 1. Then, the collimator lens 59 rotates integrally with the cylindrical reflection mirror 10 and the collimator lens 5
Reference numeral 9 denotes a reflecting surface 1 emitted from the first laser diode 1
0a is located on the optical path of the laser beam incident on it. Therefore, the laser light emitted from the first laser diode 1 passes through the collimator lens 59 and becomes parallel light, and is reflected toward the objective lens 8 by the reflecting surface 10a of the cylindrical reflecting mirror 10.

For this reason, one collimator lens 59
Can be commonly used as an optical element that converts the laser light emitted from the first laser diode 1 and the laser light emitted from the second laser diode 2 into parallel light, and the two laser diodes 1 and 2 are used. Even in this case, the number of collimator lenses 59 used can be reduced to one. Accordingly, the number of optical elements used in the optical pickup can be reduced, and the size of the optical pickup can be reduced.

In the optical pickup of this embodiment, the case where two laser diodes 1 and 2 are used has been described as an example. However, even when three or more laser diodes are used, one collimator lens is used. Individuals are fine.

[0100]

According to the optical pickup of the first aspect of the present invention, the reflecting mirror can be turned by the turning means, and the reflecting surface of the reflecting mirror can be directed to the direction of the laser diode for emitting laser light. Even when a plurality of laser diodes are provided, the laser light emitted from each laser diode can be reflected by the reflecting surface of the reflecting mirror and made incident on the objective lens. Therefore, it is not necessary to provide an optical element such as a dichroic prism for guiding the laser light emitted from the laser diode to the reflection mirror on the optical path between the laser diode and the reflection mirror, and the optical pickup can be downsized. Can be. Further, since the number of optical elements in the optical path is reduced, the light use efficiency can be increased and a good spot wavefront can be obtained. Furthermore, if the reflection mirror is rotated, it is possible to cope with the case where the number of laser diodes is increased to three or more.

According to the optical pickup of the second aspect of the present invention, since the reflecting mirror is a cylindrical reflecting mirror having a cylindrical outer diameter, the dimensional control portion when forming the cylindrical reflecting mirror is rectangular. Since the number of the reflection mirrors is smaller than that in the case where the reflection mirror is formed, the cylindrical reflection mirror can be easily formed at low cost. Furthermore, since the shape of the mounting concave portion of the housing in which the cylindrical reflecting mirror is rotatably fitted is also a cylindrical shape and there are few dimensional control portions, this mounting concave portion can be formed easily at low cost. .

According to the optical pickup of the third aspect of the present invention, the rotating means for rotating the cylindrical reflecting mirror comprises: a flange-shaped member attached to the outer peripheral portion of the cylindrical reflecting mirror;
-Since the N pole is radially magnetized and has a magnet attached to the surface of the flange member facing the housing and a coil attached to the surface of the housing facing the magnet, the cylinder is energized by energizing the coil. The shape reflection mirror can be smoothly and accurately rotated.

According to the optical pickup of the present invention, when the coil is energized to rotate the cylindrical reflecting mirror, when the cylindrical reflecting mirror is rotated to a predetermined rotating position, the elasticity is increased. The engaging body provided at the tip of the support and the engaged body provided on the housing are engaged with each other, so that the cylindrical reflecting mirror can be stopped at a correct rotation position. Further, when the engaging body and the engaged body are engaged, the electrode terminal of the engaging body and the electrode terminal of the engaged body are in an energized state, and by detecting this energized state with a detection device, the cylindrical reflection mirror is turned on. Rotation to a predetermined rotation position can be reliably detected. Furthermore, by cutting off the current supply to the coil at the same time as this detection, it is possible to reduce current consumption and prevent heat generation of the coil.

According to the optical pickup of the fifth aspect of the present invention, a flange-shaped magnet mold in which a flange-shaped member and a magnet are integrated is provided, and the flange-shaped magnet mold is attached to the outer peripheral portion of the cylindrical reflection mirror. In addition, since the flange-shaped member and the magnet, which have been two parts, become one part, cost reduction and thickness reduction can be achieved. Further, when the flange-shaped magnet mold is attached to the outer peripheral portion of the cylindrical reflecting mirror, the outer peripheral surface of the cylindrical reflecting mirror is hardly damaged, and the yield of products can be improved. Further, since the degree of adhesion between the cylindrical reflecting mirror and the flanged magnet mold is improved, the reliability of the rotating operation of the cylindrical reflecting mirror can be improved.

According to the optical pickup of the present invention, the weight of the reflection mirror can be reduced by forming the reflection mirror with the cylindrical magnet mold and the flat plate reflection mirror. Therefore, the reflection mirror can be rotated with a low current, and power consumption can be reduced.

According to the optical pickup of the present invention, since the beam diameter adjusting means is a phase difference filter film having an aperture provided on the reflecting surface of the reflecting mirror, the beam diameter adjusting means has an independent structure. This eliminates the need to provide a device, thereby reducing costs. Furthermore, there is no need to provide a separate installation space for the beam diameter adjusting means,
The size of the optical pickup can be reduced.

According to the optical pickup of the invention, since the beam diameter adjusting means is a phase difference filter film having an aperture provided on the lower surface or the upper surface of the objective lens or inside the objective lens, an independent structure is provided. It is not necessary to provide the beam diameter adjusting means, and the cost can be reduced. Further, there is no need to separately provide a space for installing the beam diameter adjusting means, and the size of the optical pickup can be reduced. Further, the position of the beam diameter adjusting means does not shift with respect to the optical axis of the objective lens,
Highly accurate recording and reproduction can be performed.

According to the optical pickup of the ninth aspect of the present invention, the rotating means for rotating the cylindrical reflecting mirror includes a flange-shaped member attached to the outer periphery of the cylindrical reflecting mirror, and Since the coil has a held coil, a magnetic piece provided in the center of the coil, and a plurality of magnets provided in the housing in opposition to the coil and the magnetic piece, by energizing the coil, It is possible to rotate the cylindrical reflection mirror smoothly and accurately. Then, since the rotation of the cylindrical reflecting mirror is stopped at a position where the magnetic piece is directly above the magnet, the cylindrical reflecting mirror can be reliably stopped at a correct rotating position. In addition, the magnetic force acting between the magnetic piece and the magnet can prevent the cylindrical reflecting mirror from rising, thereby preventing the inclination of the laser light reflected by the cylindrical reflecting mirror and incident on the objective lens. As a result, a good spot can be formed on the recording surface of the optical disk.

According to the optical pickup of the tenth aspect of the present invention, the rotating means for rotating the reflecting mirror is arranged so that the reflecting mirror is placed on the reflecting mirror holder and the optical axis of the reflecting mirror. A guide shaft provided on the reflection mirror holder, a holding recess formed in the housing so as to rotatably hold the guide shaft, and a plurality of recesses formed in positions of the housing facing the lower surface of the reflection mirror holder. And a plurality of spheres that are rotatably housed in these housing recesses and abut against the lower surface of the reflection mirror holder, a coil mounted on the lower surface of the reflection mirror holder, and a center portion of the coil. Since there are provided magnetic pieces and a plurality of magnets provided in the housing so as to face these coils and magnetic pieces, reflection is achieved by energizing the coils. It can be smoothly and accurately rotate the color with reflecting mirror holder. Since the reflection mirror holder is supported by the sphere and rotates, the frictional force at the time of rotation is reduced, and the reflection mirror can be rotated with a low current, thereby reducing power consumption. . Since the rotation of the reflection mirror is stopped at a position where the magnetic piece is directly above the magnet, the reflection mirror can be reliably stopped at the correct rotation position. Further, the floating of the reflecting mirror can be prevented by the magnetic force acting between the magnetic piece and the magnet. Therefore, the inclination of the laser light reflected by the reflecting mirror and incident on the objective lens can be prevented, and the optical disk can be prevented from tilting. A good spot can be formed on the recording surface.

According to the optical pickup of the eleventh aspect, the collimator lens is provided on the optical path of the laser light incident on the reflection surface of the reflection mirror, and is rotated integrally with the reflection mirror. When the reflecting surface of the reflecting mirror is turned to a position facing any one of the laser diodes, the collimator lens turns integrally with the reflecting mirror, and the collimating lens emits laser light, and the reflecting surface and Located between. Therefore, even when a plurality of laser diodes are provided, only one collimator lens needs to be provided, and the cost and the number of assembly steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optical pickup according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view illustrating a main part of an optical pickup according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional front view thereof.

FIG. 4 is a perspective view showing a main part of an optical pickup according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing a part thereof.

FIG. 6 is a longitudinal sectional front view showing a main part of an optical pickup according to a fourth embodiment of the present invention.

FIG. 7 is a vertical sectional front view showing a main part of an optical pickup according to a fifth embodiment of the present invention.

FIG. 8 is a longitudinal sectional front view showing a main part of an optical pickup according to a sixth embodiment of the present invention.

FIG. 9 is a longitudinal sectional front view showing a main part of an optical pickup according to a seventh embodiment of the present invention.

FIG. 10 is a front view showing a modification of the seventh embodiment.

FIG. 11 is a vertical sectional front view showing a modification of the seventh embodiment.

FIG. 12 is an exploded perspective view illustrating a main part of an optical pickup according to an eighth embodiment of the present invention.

FIG. 13 is a longitudinal sectional front view showing a main part of an optical pickup according to a ninth embodiment of the present invention.

FIG. 14 is a plan view showing a part thereof.

FIG. 15 is a plan view showing a modification of the ninth embodiment.

FIG. 16 is a perspective view showing an optical pickup according to a tenth embodiment.

FIG. 17 is a perspective view showing a conventional optical pickup.

[Explanation of symbols]

1, 2 Laser diode 7 Beam diameter adjusting means 8 Objective lens 9 Reflecting mirror 9a Reflecting surface 10 Reflecting mirror, cylindrical reflecting mirror 10a Reflecting surface 11 Housing 12 Mounting recess 14 Flange member 15 Magnet 17 Coil 18 Rotating means 21 Elastic support Body 22 Engagement body 23a, 23b Engagement body 24, 25 Electrode terminal 30 Flange magnet mold 31 Reflection mirror 31a Reflection surface 32 Cylindrical magnet mold 33 Flat plate reflection mirror 36 Coil 37 Rotating means 38a Beam diameter adjusting means, aperture Phase difference filter film 38b Aperture 40a Beam diameter adjusting means, phase difference filter film 40b having aperture 41 Flange member 43 Coil 44 Magnetic piece 45a, 45b Magnet 46 Rotating means 47 Reflection mirror holder 48 Guy Shaft portion 49 coil 50 magnetic piece 51 holding recess 52 accommodating recess 53 spheres 54a, 54b magnets 55 rotating means 59 the collimator lens

Claims (11)

[Claims] At least two laser diodes for emitting laser beams having different wavelengths, and a laser beam emitted from these laser diodes is directed to an objective lens by turning a reflection surface in a direction facing the laser diodes. A reflecting mirror for adjusting the beam diameter of the laser light emitted from the laser diode in accordance with the wavelength of the laser light, and the reflecting mirror such that the reflecting surface faces the laser diode. Rotating means for rotating the lens about the optical axis of the objective lens. 2. The reflection mirror is a columnar reflection mirror having an outer diameter formed in a columnar shape, and the columnar reflection mirror is rotated so that its central axis coincides with the optical axis of the objective lens. 2. The optical pickup according to claim 1, wherein the cylindrical reflection mirror is rotatably fitted into a mounting recess formed in the housing. 3. The rotating means is provided on a flange-shaped member attached to an outer peripheral portion of a cylindrical reflection mirror, and on a surface of the flange-shaped member facing the housing by radially magnetizing the S and N poles. The optical pickup according to claim 2, further comprising: a magnet mounted on the housing and a coil attached to a surface of the housing facing the magnet. 4. An elastic support member attached to an outer peripheral portion of a flange-shaped member, an engaging member provided at a distal end portion of the elastic support member, and a resiliently engaging member provided on a housing. A plurality of engaged bodies to be engaged, and electrode terminals provided on the engaged body and the engaged body and being in a conductive state when the engaged bodies are engaged with each other. Item 3. The optical pickup according to Item 3. 5. The optical pickup according to claim 3, wherein a flange-shaped magnet mold in which the flange-shaped member and the magnet are integrated is provided, and the flange-shaped magnet mold is attached to an outer peripheral portion of the cylindrical reflection mirror. . 6. The reflection mirror is formed by attaching a flat plate reflection mirror to a cylindrical magnet mold in which S and N poles are magnetized along the circumferential direction on the outer peripheral surface of the cylindrical portion. 2. The optical pickup according to claim 1, comprising a cylindrical magnet mold and a coil provided at a position facing the outer peripheral surface of the cylindrical portion of the cylindrical magnet mold. 7. The optical pickup according to claim 1, wherein the beam diameter adjusting means is a phase difference filter film having an aperture provided on a reflection surface of the reflection mirror. 8. The optical pickup according to claim 1, wherein the beam diameter adjusting means is a phase difference filter film having an aperture provided on the lower surface, the upper surface, or inside the objective lens. 9. A rotating member comprising: a flange-shaped member attached to an outer peripheral portion of a cylindrical reflecting mirror; a coil held by the flange-shaped member; a magnetic piece provided at a central portion of the coil; 3. The optical pickup according to claim 2, further comprising a plurality of magnets provided on the housing so as to face the coils and the magnetic pieces. 10. A rotating means comprising: a reflecting mirror holder on which a reflecting mirror is mounted; a guide shaft provided on the reflecting mirror holder in alignment with an optical axis of the reflecting mirror; and a guide shaft provided on the reflecting mirror holder. A holding recess formed in the housing so as to be rotatably held, a plurality of housing recesses formed at a position in the housing opposed to the lower surface of the reflection mirror holder, and the housing recesses rolling freely. A plurality of spheres housed and abutting against the lower surface of the reflection mirror holder, a coil mounted on the lower surface of the reflection mirror holder, a magnetic piece provided at the center of the coil, and these coils and magnetic pieces 2. The optical pickup according to claim 1, further comprising: a plurality of magnets provided on the housing so as to face the housing. 11. The light according to claim 1, further comprising a collimator lens positioned on an optical path through which the laser light emitted from the laser diode is incident on the reflection surface and rotated integrally with the reflection mirror. pick up.