JP3526556B2 - Optical element support device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to information using light, for example, a magneto-optical disk drive, a write-once disk drive, a phase change disk drive, a CD-ROM,
The present invention relates to an optical element support device used in an information recording and / or reproducing apparatus for recording information on and / or reproducing information from the recording medium such as a DVD and an optical card.

[0002]

2. Description of the Related Art An information recording and / or reproducing apparatus of this kind has been widely known from the past, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-301226, and an optical element supporting apparatus used here. Is a movable part that supports the optical element, a support member that supports the movable part so as to be movable in at least a first direction with respect to the fixed part, and a drive that drives the movable part in the first direction. And means.

The information recording and / or reproducing apparatus disclosed in Japanese Patent Application Laid-Open No. 4-301226 is applied to each of a plurality of recording surfaces of a recording medium having a plurality of recording surfaces and one guide surface. Information can be selectively recorded and / or reproduced from each of the above.

In this conventional information recording and / or reproducing apparatus, the guide beam is focused on one guide surface so that the plurality of recording surfaces of the recording medium are substantially parallel to each other and parallel to each other. Tracking control is performed on each of the plurality of information recording tracks formed on the recording medium, and at the same time, the scanning beam is focused on one of the plurality of recording surfaces to selectively select one of the plurality of recording surfaces. Information can be recorded and / or reproduced from any of the above.

Focusing of a guide beam on one guide surface and focusing of a scanning beam on each of a plurality of recording surfaces are performed by, for example, arranging a pair of optical elements substantially symmetrically with the recording medium sandwiched on both sides of the recording medium. The one optical element (that is, the movable portion) is moved by the driving means in the first direction (focusing direction) substantially perpendicular to the information recording surface of the recording medium.

If the focal length of one optical element is 3 mm, the focal length of the other optical element is 12 mm, the distance between each of the plurality of recording surfaces is 10 μm, and the number of the plurality of recording surfaces is 10. In order to move the focus of the scanning beam between the 10 recording surfaces, one of the optical elements is
(Number between each of the plurality of recording surfaces) × 10 μm × (12 /
3) Must move in the first direction by ² = 1440 μm.

In the optical element supporting device used in the conventional information recording and / or reproducing apparatus, the supporting portion supporting the movable portion holding the one optical element is specifically described. Not not. However, it extends parallel to each of the one guide surface and the plurality of recording surfaces in a state of being separated from each other in parallel in the first direction (focusing direction), and one end of each is fixed to the movable portion and the other end is fixed. A configuration of a supporting portion using two cantilever parallel leaf springs fixed to a fixed portion is widely known.

[0008]

With the optical element supporting device having the supporting portion having such a structure, the one optical element is used to focus the scanning beam on each of the plurality of recording surfaces. When the supporting movable part is moved in the first direction (focusing direction), the two cantilever parallel leaf springs are bent. The movable part supported by the two cantilevered parallel leaf springs thus curved has two moving parts relative to the position of the movable part when the two cantilevered parallel leaf springs were straight before being bent. A slight displacement occurs in the extending direction of the cantilevered parallel leaf spring.

As a result, the optical axis of the one optical element supported by the movable portion is 2 with respect to the optical axis of the other optical element which is not supported by the movable portion and is immovable.
A displacement occurs in the extending direction of the single cantilevered parallel leaf spring.
The focal point of the light flux after passing through the one optical element is formed on the desired recording surface substantially parallel to the desired recording surface due to the positional deviation and is formed in parallel with each other on the recording surface. It moves in the direction (tracking direction) that traverses the information recording track, and deviates from the desired recording track. As a result, recording and / or reproducing of information on a desired recording track may not be successful.

Such a problem caused by the bending of the two cantilevered parallel leaf springs can be alleviated by increasing the length of the two cantilevered parallel leaf springs. Not only becomes larger, but also increases in weight.

The present invention has been made under the above circumstances, and an object of the present invention is to set the optical axis of a light beam after passing through the optical element to the optical axis of the light beam before entering the optical element even if the optical element is moved. An object of the present invention is to provide an optical element support device which has a small inclination angle with respect to the device and which does not increase the outer size of the device or increase the weight.

[0012]

In order to achieve the above-mentioned object of the present invention, an optical element supporting device according to the present invention comprises: a movable part having an optical element, and the movable part with respect to a fixed part. The optical element includes at least a support member that supports the optical element so as to be movable in a first direction along the optical axis of the optical element, and a drive unit that drives the movable portion in the first direction. In the optical element supporting device, the light flux which has entered and which has passed through the optical element forms a spot on a recording medium by an objective lens, wherein the supporting member extends from the movable portion toward the fixed portion, and with respect to the fixed portion. It is supported in a cantilever manner, and the optical axis of the optical element is in the extension direction of the support member from the optical axis of the light beam incident on the optical element in the middle of the moving range of the movable portion in the first direction .
And is displaced in a direction away from the fixed portion .

[0013]

When the support member is cantilevered with respect to the fixed portion , the movable portion is arranged at a first position in the extending direction of the support member in the middle of the moving range. The movable portion is arranged at a second position close to the fixed portion in the extending direction at both ends of the moving range, and the movable portion is at the middle and both ends of the moving range.
Oite the optical element while being disposed between the first position and the second position in the extending direction between the
The optical axis of the child coincides with the optical axis of the light beam incident on the optical element.
It

[0015]

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, the overall structure and operation of an information recording and / or reproducing apparatus using an optical element supporting device according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. To do.

Here, FIG. 1 is a plan view schematically showing an optical system of an information recording and / or reproducing apparatus using the optical element supporting device according to the embodiment of the present invention; FIG. 3 is a side view schematically showing a part of the optical system of FIG. 1 in an enlarged manner from the side; and FIG. 3 is a side view showing the optical disk and the objective lens shown in FIG. It is a figure.

In the information recording and / or reproducing apparatus using the optical element supporting apparatus according to this embodiment, the information recording / reproducing LD (wavelength 650 nm laser diode) 10 is perpendicular to the paper surface of FIG. The linearly polarized light for recording and reproduction is emitted and collimated by the collimator lens 12. The recording / reproducing light collimated by the collimator lens 12 is incident on the beam splitter (half mirror) 14, a part of it passes through the rest, and the rest is reflected by it. The recording / reproducing light that has passed through the beam splitter 14 is condensed by a condenser lens 16 and is incident on a monitor PD (photodetector) 18. P for monitor
D18 is used to measure the amount of light emitted from the recording / reproducing LD 10.

The recording / reproducing light reflected by the beam splitter 14 is reflected by the polarization beam splitter 20 and travels toward the reflecting mirror 22. The reflecting mirror 22 reflects the recording / reproducing light from the polarization beam splitter 20 downward in a direction orthogonal to the paper surface of FIG. 1, and is arranged below the reflecting mirror 22 as well shown in FIG. The spot P1 is formed on the desired recording surface 28a located on the desired track 27a on the guide surface of the base layer 27 in the recording medium 26 via the objective lens 24 that is formed.

The recording medium 26 is a recording medium capable of recording and / or reproducing information by using light, and is, for example, a magneto-optical disc, a write-once disc, a phase change disc, a CD.
-Including a ROM, a DVD, an optical card, and the like, but in this embodiment, the base layer 27 having the guide surface GS on which a large number of tracks 27a having high reflectance are formed and the guide surface GS of the base layer 27. Recording layer 28 having a plurality of recording surfaces 28a, 28b, 28c arranged in parallel with
It is a phase-change type disk equipped with and.

The reflected light from the spot P1 travels backward in the optical path at the time of incidence, returns to the beam splitter 14, and part of it passes through the beam splitter 14. Beam splitter 1
The reflected light that has passed through 4 is converted into convergent light having astigmatism by a toric lens (convex lens + cylindrical lens) 29, and is incident on a focus error signal / recording / reproducing signal detecting PD (photodetector) 30.

The focus error signal / recording / reproducing signal detecting PD 30 has a light receiving surface divided into four, and is used for detecting the focus error signal and the recording / reproducing signal for the spot P1 based on the astigmatism method.

In the information recording and / or reproducing apparatus according to this embodiment, the guide LD (wavelength 7
A guide light, which is linearly polarized light parallel to the paper surface of FIG. 1, is emitted from the 80 nm laser diode) 32, passes through the hologram 34, and is substantially collimated by the collimator lens 36. The guide light substantially collimated by the collimator lens 36 passes through the polarization beam splitter 20,
Heading towards the reflector 22. The reflecting mirror 22 reflects the guiding light from the polarization beam splitter 20 downward in a direction orthogonal to the paper surface of FIG. 1, and is arranged below the reflecting mirror 22 as well shown in FIG. Objective lens 2
The spot P2 is formed on the guide surface GS of the lowermost layer in the recording medium 26 via 4.

Collimator lens 3 which is a part of the optical element
6 is supported by the optical element supporting device 100 so as to be movable in the direction along the optical axis. Optical element support device 100
Holds the collimator lens 36 and the collimator lens 3
6, a movable part 100a that is movable with 6, and the movable part 100
A support member 10 that supports a in a first direction along the optical axis of the collimator lens 36 with respect to the fixed portion 100b.
0c, a detection substrate 100d which is a part of a detector for detecting the position and / or speed of the movable part 100a in the first direction, and an illustration for driving the movable part 100a in the first direction. Drive means, which is not provided.
The fixed portion 100b and the detection substrate 100d are fixed at predetermined positions on the fixed substrate 100e. The drive means is, for example, the fixed part 10 corresponding to either one of the coil or the magnet provided in the movable part 100a and the one of the coil or the magnet of the movable part 100a.
It is configured by a combination with the other of the coil or magnet provided in 0b.

As shown enlarged in FIG.
The optical axis 38 of the optical system for the guiding light has an inclination θ with respect to the optical axis 40 of the optical system for the recording / reproducing light described above. Therefore, the spot P2 of the guide light is along the direction of the plurality of recording surfaces 28a, 28b, 28c in the recording medium 26 and is orthogonal to the plurality of recording tracks 28t with respect to the spot P1 of the recording / reproducing light. It is separated by a predetermined distance a in TR (tracking direction). The distance a is usually set to about 5 μm to about 100 μm.

A plurality of recording surfaces 28 in the recording medium 26 are provided.
The tangential direction TG (see FIG. 1) along each of a, 28b, and 28c, which is the tangent to each of the plurality of recording tracks 28t, is set to the tangential direction TG (see FIG. 1). A direction orthogonal to each of them is defined as a focusing direction FO.

The reflected light from the spot P2 reverses the optical path at the time of incidence and is diffracted by the hologram 34, as well shown in FIG. The ± first-order lights are incident on a pair of focus error signal / tracking error signal and reproduction signal (track number) detection PDs (photodetectors) 36a and 36b each having a light-receiving surface divided into six parts.

The ± 1st order lights are both convergent lights, one focus is located in front of one focus error signal / tracking error signal and the reproduction signal detecting PD 36a, and the other focus is the other focus error signal / tracking. It is located at the back of the error signal and reproduction signal detecting PD 36b.

The pair of tracking error signal and reproduction signal detection PDs 36a and 36b detect a focus error signal related to the spot P2 of the guide light by a so-called beam size method, and a tracking error signal and a reproduction signal (reproduced by a push-pull method). Track number) detection.

As shown in FIG. 2, the recording medium 26
The objective lens 24 immediately above is supported by the support drive means 42, and the support drive means 42 records the recording medium 26.
A plurality of recording surfaces 28a, 28b, 28c and a guide surface G
It is movably supported in a focusing direction FO that is orthogonal to S. The objective lens 24 is further provided with the support driving means 42 and the reflecting mirror 22 in the tracking direction TR.
It is also possible to move.

As is clear from the above description, by moving the objective lens 24 in the focusing direction FO by the support driving means 42, the spot P1 of the recording / reproducing light from the recording / reproducing LD 10 is formed in the recording medium 26. It is possible to focus on any one of the plurality of recording surfaces 28a, 28b, 28c. During this time, the converging lens 36
By moving the optical element supporting device 100 in the direction along the optical axis of the converging lens 36, the objective lens 24
The objective lens 24 is compensated for the fact that the focus of the spot P2 of the guiding light from the guiding LD 32 moves in the focusing direction FO and shifts from the guide surface GS in the recording medium 26 due to the movement in the focusing direction FO.
It is possible to keep the focus of the spot P2 of the guiding light on the guide surface GS in the recording medium 26 despite the movement in the focusing direction FO.

The recording / reproducing light from the recording / reproducing LD 10 and the guiding light from the guiding LD 32 have polarization directions orthogonal to each other and are combined and separated by the polarization beam splitter 20. Guide light from the guide LD 32 incident on the recording / reproducing signal detecting PD 30 and a pair of focus error signal / tracking error signal and reproducing signal detecting PDs 36a, 36b
The recording / reproducing light from the recording / reproducing LD 10 incident on is extremely small.

Further, the optical axis 3 of the optical system for guiding light is used.
Since 8 is inclined with respect to the optical axis 40 of the optical system for recording / reproducing light, as shown in FIG.
The recording / reproducing light from 10 and the guiding light from the guiding LD 32 are separated in the direction orthogonal to the paper surface of FIG. Therefore, the recording / reproducing light from the recording / reproducing LD 10 does not enter the pair of focus error signal / tracking error signal and reproduction signal detecting PDs 36a and 36b,
Further, the guide light from the guide LD 32 does not enter the focus error signal / recording / reproducing signal detecting PD 30.

As a result of these, the focus error signal for recording / reproducing light and the recording / reproducing signal detecting PD 30 are detected.
And a pair of focus error signal / tracking error signal for reproducing light and PD 36a, 3 for reproducing signal detection
Crosstalk and noise are hardly generated between 6b and 6b.

As is apparent from FIG. 3, which is enlarged from FIG. 2, the base layer 27 of the recording medium 26 has a plurality of recording surfaces 28a, 28 of the recording layer 28 near the rotation center C thereof.
a plurality of height reference planes ST1, ST2, ST which are formed stepwise from the guide surface GS at the same height position as b, 28c
3 is further included. In this embodiment, the distances d between the height reference planes ST1, ST2, ST3 are the same, and the distance d is preferably 2 to 50 μm, more preferably 5 to 15 μm.

Next, the first structure constructed as described above
Recording and reproducing operations of information on a desired recording surface 28a of the recording medium 26 in the information recording and / or reproducing apparatus according to the embodiment will be described.

First, the objective lens 24 is moved together with the support driving means 42 and the reflecting mirror 22 on the recording medium 26 to a predetermined initial position between the rotation center C of the recording medium 26 and the outer peripheral edge. At the initial position, the focus error signal and the focus error signal from the recording / reproducing signal detecting PD 30 are used to detect the objective lens 2 directly above the recording medium 26.
4 is driven by the support driving means 42 so that the spot P1 of the recording / reproducing light is focused on any of the plurality of tracks 27a on the guide surface GS of the recording medium 26, as shown by the solid line in FIG. .

Next, a pair of focus error signal / tracking error signal and reproduction signal detecting PD 36a,
By using the focus error signal from 36b, the converging lens 36 is moved by the optical element supporting device 100 in the direction along the optical axis thereof, and as shown by the solid line in FIG. Is focused on any of the plurality of tracks 27a on the guide surface GS of the recording medium 26.

Next, a pair of focus error signal / tracking error signal and reproduction signal detecting PDs 36a, 3
According to the reproduction signal relating to the track number in the plurality of tracks 27a obtained from 6b, the objective lens 24 together with the support driving means 42 and the reflecting mirror 22 in the tracking direction TR.
In, the guide light spot P2 is moved in the direction toward the rotation center C of the recording medium 26 to the track number corresponding to the desired start position of the recording surface 28a. At this time, the spot P1 of the recording / reproducing light is the recording medium 2
6 is projected on the first reference plane ST1 at the same height position as the desired recording surface 28a on the base layer 27 in FIG.
The focus of the spot P1 is not on the first reference plane ST1. Therefore, by using the focus error signal and the focus error signal from the recording / reproducing signal detecting PD 30,
The driving means 4 for supporting the objective lens 24 directly above the recording medium 26
2 to drive the spot P1 of the recording / reproducing light to the first reference plane ST located at the same height as the desired recording surface 28a of the recording medium 26, as indicated by the chain double-dashed line in FIG.
Focus on 1. At the same time, the objective lens 24
Moves the focus of the spot P2 of the guide light upward from the guide surface GS of the recording medium 26, so that the focus error signal from the pair of focus error signals / tracking error signals and the reproduction signal detecting PDs 36a and 36b is transmitted. By using the converging lens 36, the optical element supporting device 10
0 to move in the direction along the optical axis, and as shown by the chain double-dashed line in FIG.
2 is a desired recording surface 28 on the guide surface GS of the recording medium 26.
The track number corresponding to the start position of a is refocused.

After that, while the recording medium 26 rotates around the rotation center line C in a predetermined direction at a predetermined rotation speed, the objective lens 24 together with the support driving means 42 and the reflecting mirror 22 in the tracking direction TR. It is moved intermittently toward the outer periphery of 26. This intermittent movement controls the position of the collimator lens 36 in the focusing direction FO so that the optical element supporting device 100 of the collimator lens 36 for guiding light makes the output from the detector including the detection substrate 100d constant. While the light is being guided, the spot P2 of the guiding light is sequentially focused on the plurality of tracks 27a outside the track number corresponding to the start position of the desired recording surface 28a on the guide surface GS of the recording medium 26. Done.

While the spot P2 of the guiding light is focused on the track 27a, this track 2
The spot P1 of the recording / reproducing light on the track of the track number of the desired recording surface 28a corresponding to the number of the track number of 7a minus the track number corresponding to the start position of the desired recording surface 28a. Is in focus. That is, the spot P1 of the recording / reproducing light beam records and / or reproduces information on / from the track having the track number among the plurality of tracks on the desired recording surface 28a.

As described above, the objective lens 24 is controlled by the support driving means 42 in the focusing direction FO for the recording / reproducing light according to the focus error signal and the focus error signal from the recording / reproducing signal detecting PD 30. The spots P1 of the recording / reproducing light are at the same height level as the first reference plane ST1 which is separated from the guide surface GS of the base layer 27 by a predetermined distance d, and a plurality of tracks on the desired recording surface 28a in the recording layer 28. The focus is maintained on.

Further, since the collimator lens 36 serves as the guide light, the optical element support device 10 is operated in accordance with the pair of focus error signals / tracking error signals and the focus error signals from the reproduction signal detecting PDs 36a and 36b.
The focus is controlled in the focusing direction FO by 0, whereby the spot P2 of the guiding light maintains the focus on the plurality of tracks 27a on the guide surface GS of the base layer 27.

Therefore, recording of information on a plurality of tracks on the desired recording surface 28a using the recording / reproducing light and reproduction of information from a plurality of tracks on the desired recording surface 28a are stably performed.

Other recording surface 28 using recording / reproducing light
Recording of information on a plurality of tracks of b and 28c and reproduction of information from a plurality of tracks of other recording surfaces 28b and 28c are also performed on the desired recording surface 2 using the recording / reproducing light described above.
Information can be recorded on a plurality of tracks 8a and information can be reproduced from a plurality of tracks on a desired recording surface 28a.

For example, when recording information on a plurality of tracks on the recording surface 28b or reproducing information from a plurality of tracks on the recording surface 28b, the objective lens 24 together with the supporting and driving means 42 and the reflecting mirror 22 is used for the recording medium 26. After being moved to the above-mentioned predetermined initial position, the spot P1 of the recording / reproducing light and the spot P2 of the guiding light are moved to the guide surface of the recording medium 26 at the initial position as shown by the solid line in FIG. It is focused on any of the plurality of tracks 27a on the GS.

Next, a pair of focus error signal / tracking error signal and reproduction signal detecting PDs 36a, 3
The objective lens 24 is moved in the tracking direction T toward the rotation center C of the recording medium 26 in the tracking direction T along with the support driving means 42 and the reflecting mirror 22 according to the reproduction signal relating to the track number in the plurality of tracks 27a obtained from 6b, and recording is performed. The guide light spot P2 is moved to the track number corresponding to the start position of the surface 28b. At this time, the spot P1 of the recording / reproducing light is projected on the second reference plane ST2 at the same height position as the recording surface 28b in the base layer 27 in the recording medium 26, but the focus of the spot P1 is the second. Is not on the reference plane ST2. Therefore,
PD30 for detecting focus error signal and recording / reproducing signal
The objective lens 24 directly above the recording medium 26 is driven by the support driving means 42 by using the focus error signal from the recording medium 26, and the spot P1 of the recording / reproducing light is at the same height position as the recording surface 28b of the recording medium 26. Focus on the second reference plane ST2. At the same time, the focus of the spot P2 of the guiding light is changed by the movement of the objective lens 24.
Of the focus error signal / tracking error signal and the pair of focus error signals from the reproduction signal detecting PDs 36a and 36b, the collimator lens 36 is moved to the optical element supporting device 10
The spot P2 of the guiding light is refocused on the track number corresponding to the start position of the recording surface 28b on the guide surface GS of the recording medium 26 by moving it in the direction along the optical axis by 0.

Thereafter, while the recording medium 26 rotates about the rotation center line C in a predetermined direction at a predetermined rotation speed, the objective lens 24 together with the support driving means 42 and the reflecting mirror 22 in the tracking direction TR. It is moved intermittently toward the outer periphery of 26. This intermittent movement controls the position of the collimator lens 36 in the focusing direction FO so that the optical element supporting device 100 of the collimator lens 36 for guiding light makes the output from the detector including the detection substrate 100d constant. During this, the spot P2 of the guide light is sequentially focused on the plurality of tracks 27a outside the track number corresponding to the start position of the recording surface 28b on the guide surface GS of the recording medium 26. .

While the spot P2 of the guide light is focused on the track 27a, this track 2
The spot P1 of the recording / reproducing light is focused on the track number of the plurality of tracks on the recording surface 28b corresponding to the number of the track number of 7a minus the track number corresponding to the start position of the recording surface 28b. Will be. That is, the recording / reproducing light spot P1
Thus, information is recorded on the track having the track number among a plurality of tracks on the recording surface 28b and / or information is reproduced from the track.

As described above, the objective lens 24 is controlled in the focusing direction by the support driving means 42 according to the focus error signal and the focus error signal from the recording / reproducing signal detecting PD 30 for the recording / reproducing light. The spot P1 of the recording / reproducing light is at the same height level as the second reference plane ST2, which is separated from the guide surface GS of the base layer 27 by a predetermined distance 2d, and has a focus on a plurality of tracks on the recording surface 28b in the recording layer 28. Maintenance is done.

Further, since the collimator lens 36 serves as the guide light, the optical element support device 100 is operated in accordance with the focus error signal / tracking error signal and the focus error signal from the reproduction signal detecting PDs 36a and 36b.
Is controlled in the focusing direction by this, so that the spot P2 of the guide light maintains the focus on the plurality of tracks 27a on the guide surface GS of the base layer 27.

Therefore, the recording surface 2 using the recording / reproducing light is used.
Recording of information on a plurality of tracks 8b and recording surface 28
Information can be stably reproduced from a plurality of tracks of b.

As is clear from the above description, the fluctuation of the wavelength of the light emitted from each of the recording / reproducing LD 10 and the guiding LD 32, the change of the drive current sensitivity of the optical element supporting device 100, and the detection substrate 100d. In the conventional focusing direction FO of the two spots P1 and P2, various factors such as offsets of the detectors that cause the relative positions of the two spots P1 and P2 in the focusing direction FO to shift in the conventional direction. The relative position can be held stably.

In this embodiment, the number of recording layers 28 of the recording medium 26 is three, but any number may be used as long as it is one or more. The error detecting method may be any known method other than the above.

Next, the structure of the optical element supporting device 100 will be described in detail with reference to FIGS.
4 is an enlarged perspective view of the optical element support device 100; FIG. 5 is a cross-sectional view along the optical axis of the collimator lens 36 of the optical element support device 100 of FIG. 4;
6 is an exploded perspective view of the optical element support device 100 of FIG. 4; and FIG. 7 is an optical element support device 100 of FIG.
FIG. 7 is a front view showing the side of the collimator lens 36 along the optical axis from the side opposite to the guide LD 32.

As shown in detail in these figures,
The movable portion 100a, which holds the collimator lens 36 and is movable together with the collimator lens 36, has a fixed portion 100b.
Are located away from the movable portion 100a in a direction orthogonal to the optical axis OA of the collimator lens 36. The support member 100c that supports the movable portion 100a so as to be movable with respect to the fixed portion 100b in the first direction along the optical axis OA of the collimator lens 36 is mutually movable in the first direction in the movable portion 100a. It is composed of a pair of leaf springs, one end of each of which is fixed to two spaced apart positions.
The pair of leaf springs extend from the above two positions of the movable portion 100a toward the fixed portion 100b in parallel to each other, and the respective extending ends (other ends) are fixed to the fixed portion 100b.
In this embodiment, the direction in which the pair of leaf springs of the support member 100c extends is the tangential direction TG, as can be seen from FIG.

The fixed portion 100b is fixed to the fixed substrate 100e, and the fixed substrate 100e extends from the fixed portion 100b along the pair of leaf springs of the support member 100c toward the movable portion 100a and beyond the movable portion 100a. It extends to the opposite side of 100b.

The fixed substrate 100e is made of a magnetic material such as iron. An end of the fixed substrate 100e on the side opposite to the fixed portion 100b is raised toward the first side surface SS1 of the movable portion 100a on the side opposite to the fixed portion 100b, and a predetermined gap is formed between the first side surface SS1 and the side surface SS1. A first yoke YK1 facing each other in parallel. Further, on the fixed substrate 100e, the supporting member 100c
The area between the pair of leaf springs is raised toward the second side surface SS2 of the movable portion 100a on the side of the fixed portion 100b and faces the second side surface SS2 in parallel with a predetermined gap. It constitutes the yoke YK2.

The gap between the first side surface SS1 of the movable portion 100a and the first yoke YK1 facing the first side surface SS1 is equal to the movable portion 10a.
0a second side surface SS2 and second yoke YK facing the second side surface SS2
It is the same as the gap between the two.

The first side surface SS1 and the second side surface of the movable portion 100a
A coil CL having the same size and a same number of windings is fixed to each of the side surfaces SS2, and the first yoke YK1 is also provided.
A pair of permanent magnets PM is fixed to each of the second yokes YK2 so as to face the coil CL. First yoke YK
In each of the first and second yokes YK2, a pair of permanent magnets PM are arranged adjacent to each other in the first direction along the optical axis OA of the collimator lens 36, and coils having different magnetic poles correspond to each other. It faces CL. Moreover,
The pair of magnetic poles facing the corresponding coil CL in the pair of permanent magnets PM of the first yoke YK1 is the pair facing the corresponding coil CL in the pair of permanent magnets PM of the second yoke YK2. It is the opposite of the magnetic pole.

The combination of the two pairs of permanent magnets PM and the pair of coils CL constitutes a driving means for driving the movable portion 100a in the first direction.

By controlling the direction and strength of the current flowing through the pair of coils CL, the mutual action of the electromagnetic force generated in the pair of coils CL and the magnetic force generated in the two pairs of permanent magnets PM. , The movable part 1 holding the collimator lens 36
00a can be moved in a first direction along the optical axis OA of the collimator lens 36 within a predetermined range by a desired distance against the elasticity of the pair of leaf springs of the support member 100c.

The guide LD 32 in the movable part 100a
An eaves-shaped target TA is provided at an end opposite to the hologram 34 and a part of the light flux from the guide LD 32 after passing through the collimator lens 36.
The target TA is made of white plastic, and the inner surface of the part projecting to a part of the light flux is a concave curved surface extending in a substantially semicircular shape. This inner surface functions as a light reflecting surface RF and can be subjected to light reflectance increasing treatment such as nickel plating in order to increase the light reflectance. The outer edge OE of the light reflection surface RF of the target TA is, as shown in FIG.
It is shaped like a half obtained by cutting an ellipse having a major axis arranged in a direction orthogonal to the extending direction of the pair of leaf springs and orthogonal to the optical axis OA of the collimator lens 36 along the minor axis.
This is because the guide light traveling to the base layer 27 in the recording medium 26 through the polarization beam splitter 20, the reflecting mirror 22, and the objective lens 24 after passing through the target TA is reflected by the reflecting mirror 22 along the surface of the recording medium 26. This is because the recording medium 26 is vertically long in the tracking direction of the recording medium 26, which is the direction of movement of the objective lens 24 along with the support driving means 42. As a result, the range of tracking control using the target light can be expanded.

On the fixed substrate 100e, the movable portion 100
An opening 102 is formed below the target TA of a. The opening 102 extends in the first direction along the optical axis OA of the collimator lens 36 larger than the moving range of the target TA accompanying the above movement of the movable portion 100a, and the light receiving surface of the detection substrate 100d is located in the opening 102. LR is arranged. The target light reflected by the light reflecting surface RF of the target TA is focused on the light receiving surface LR of the detection substrate 100d, and a light spot P3 is formed as shown in FIGS. 5 and 7.

Next, referring to FIG. 8, the detection substrate 10
The configuration and operation of 0d will be described in detail. Here, FIG. 8 is a diagram schematically showing the configuration of the detection substrate 100d and a collimator lens position signal indicating the position of the collimator lens 36 detected by the detection substrate 100d in the first direction along the optical axis OA.

The light-receiving surface LR of the detection substrate 100d has an elongated shape in the first direction along the optical axis OA of the collimator lens 36, and a plurality of light-receiving surfaces LR are arranged in the first direction at a predetermined pitch P (in this embodiment). Then, it is equally divided into 10) light receiving parts.

Among the plurality of light receiving portions of the light receiving surface LR, the odd number light receiving portions are connected to the plus (+) side input terminal of the adder 104, and the even number light receiving portions are the minus (−) side of the adder 104. It is connected to the input terminal. The signal a input to the plus (+) side input terminal of the adder 104 and the adder 10
The differential output signal a-b generated from the difference from the signal b input to the negative (-) side input terminal of No. 4 is focused by the target light from the light reflecting surface RF of the target TA and FIGS. When the light spot P3 is located in the middle of two adjacent light receiving portions as shown therein, the value becomes 0, and the value increases as the light spot P3 moves toward the odd-numbered light receiving portions. Is maximized when it is located at the center of the odd-numbered light receiving section. Further, the value becomes smaller as the light spot P3 moves from the middle of two adjacent light receiving parts toward the even-numbered light receiving part, and the value becomes the minimum when the light spot P3 is located at the center of the even-numbered light receiving part. Becomes

Therefore, as shown in FIG. 8, when the light spot P3 is moved in the longitudinal direction of the plurality of light receiving portions of the light receiving surface LR, the differential output signals ab output from the adder 104 are output. Has a triangular wave shape with two equal sides.

From the plurality of light receiving portions on the light receiving surface LR, light receiving signals from the respective light receiving portions are further extracted.

Therefore, in this embodiment, when a current is passed through the pair of coils CL of the driving means of the optical element supporting device 100 to move the collimator lens 36 in the first direction along the optical axis OA, the detection substrate is detected. The light spots P3 move in the longitudinal direction of the light receiving surface LR on the plurality of light receiving portions of the light receiving surface LR of 100d. At this time, the fixed substrate 100e (that is, the fixed unit 1
00b), the relative position of the movable part 100a (that is, the collimator lens 36) is known, and thus the collimator lens 3 along the optical axis 38 (see FIG. 2) of the guide light is detected.
The relative position of 6 is roughly known. Further, the adder 104
By controlling the currents flowing through the pair of coils CL of the driving means of the optical element supporting device 100 so that the differential output signals a-b from 0 to 0 become zero, it is possible to accurately set the current in the middle of two desired adjacent light receiving portions. The light spot P3 can be arranged.

This means that the light receiving surface L of the detection substrate 100d is
This means that the light spot P3 can be accurately and precisely arranged at an intermediate position between two desired light receiving portions adjacent to each other among the plurality of light receiving portions of R, and thus the optical axis of the guide light. Collimator lens 3 along 38 (see FIG. 2)
This means that the relative positions of 6 can be accurately and precisely positioned at any of the intermediate positions within the range of the light receiving surface LR in the longitudinal direction.

Furthermore, it is possible to roughly know the relative position of the movable portion 100a (ie, the collimator lens 36) to the fixed substrate 100e (ie, the fixed portion 100b) depending on which of the plurality of light receiving portions the light receiving signal is output from. I can. Further, one of the driving means of the optical element supporting device 100 is set so that the differential output signal a-b from the adder 104 becomes zero.
By controlling the current flowing through the pair of coils CL, the light spot P3 can be accurately located in the middle of two desired adjacent light receiving portions.
, The differential output signal a− from the adder 104 is placed.
The light spot P3 is directed from the middle of two desired adjacent light receiving portions into the light receiving portion on the odd side until b increases to a desired value or the differential output signal ab decreases to a desired value. , Or the movable member 100a holding the collimator lens 36 is moved toward the even-numbered side light-receiving unit. Thereby, the detection substrate 100
The light spot P3 can be accurately and precisely arranged at any position other than the middle of two adjacent light-receiving parts of the plurality of light-receiving parts of the light-receiving surface LR of d, and by extension, the optical axis of the guide light. Collimator lens 36 along 38 (see FIG. 2)
Can be accurately and precisely positioned within the range of the light receiving surface LR in the longitudinal direction.

In the embodiment described above, the detection substrate 1
Although the light receiving signals are taken out from the plurality of light receiving portions of 00d, the relative position of the movable portion 100a (that is, the collimator lens 36) with respect to the fixed substrate 100e (that is, the fixed portion 100b) can be known without doing so. Consequently, the relative position of the collimator lens 36 along the optical axis 38 of the guide light (see FIG. 2) can be roughly known. That is, first, a large current is applied to the pair of coils CL of the driving means of the optical element supporting device 100 so that the light spot P3 is located outside one end of one of the plurality of light receiving portions of the light receiving surface LR of the detection substrate 100d. Shed. Next, a current smaller than this large current is made to flow through the pair of coils CL, so that the light spot P3 becomes the detection substrate 100d.
The light receiving surface LR is located at any one of the plurality of light receiving portions from the one end. During this period, adder 1
By counting the number of times when the value of the differential output signal ab of 04 becomes zero, it is possible to roughly know on which light receiving part the light spot P3 is located from the one end of the plurality of light receiving parts.

The collimator lens 36 is, for example, a guide L
When it is moved in a direction approaching D32, the spot P2 of the guiding light by the objective lens 24 immediately above the recording medium 26 is formed.
The relative position of the focal point of the objective lens 24 with respect to the objective lens 24 in the optical axis direction is determined by the collimator lens 36.
And a distance Z1 determined by the vertical magnification of the objective lens 24 in the direction away from the objective lens 24. However, at this time, the relative position of the focal point of the reproduction light spot P1 by the objective lens 24 with respect to the objective lens 24 in the optical axis direction of the objective lens 24 does not change. The distance Z1 is set to the plurality of recording layers 28a, 28b of the recording medium 26,
28c, the spot P2 of the guide light is fixed to the guide surface GS of the recording medium 26 by the focus servo, and as a result, the spot P1 of the reproduction light is the distance d from the guide surface GS. It is fixed to the first recording surface 28a which is close to the lens 24.

As is clear from the above description, in this embodiment, the LD for guide 32, the light reflecting surface RF of the target TA of the movable portion 100a, and the detection substrate 100 are used.
The light receiving surface LR of d constitutes a detector that detects the position or speed of the movable portion 100a in the first direction, which is the direction along the optical axis OA of the converging lens 36 held by the movable portion 100a.

Then, the LD 32 for guiding and the movable part 100
The light reflecting surface RF of the target TA of a constitutes a single first portion of the detector, and the plurality of light receiving portions of the light receiving surface LR constitute a plurality of second portions. And the first
The rough position detection for detecting any one of the plurality of second portions and the precise position detection for detecting each of the plurality of second portions are performed.

By arranging a plurality of light receiving portions of the light receiving surface LR for detecting the relative position of the collimator lens 36 in the first direction along the optical axis OA of the collimator lens 36 in the first direction, the collimator is arranged. The relative position of the lens 36 can be accurately detected in a wide range. Moreover, the dimensions of the plurality of light receiving portions along the first direction are small, and the responsiveness thereof is high. Further, since it is possible to obtain a large number of positions where the differential output becomes zero by using the adder 104 from a plurality of light receiving units, the relative position of the collimator lens 36 is precisely controlled by utilizing the large number of positions. Further, the position where the differential output becomes zero is not easily affected by the temperature change and the fluctuation in the electric circuit, and the relative position of the collimator lens 36 can be accurately and stably controlled.

In this embodiment, the light reflecting surface RF of the target TA receives the light while reflecting the peripheral portion having a relatively low light intensity in the guide light from the guide LD 32 toward the light receiving surface LR of the detection substrate 100d. A light spot P3 having a relatively high light intensity is formed on the surface LR. Therefore, it is possible to generate a relatively strong light receiving signal even if the light receiving sensitivity of each of the plurality of light receiving portions of the light receiving surface LR is not so high. Therefore, even if each of the plurality of light receiving portions is formed of an inexpensive one, the relative position of the collimator lens 36 can be accurately detected.

In addition, the movable portion 100a detects the relative position of the collimator lens 36, which increases the weight of the movable portion 100a, lowers the moving sensitivity of the movable portion 100a, and increases the manufacturing cost. It does not require a light receiving section or an electrical connection to these.

Further, the number of light receiving portions forming the light receiving surface LR can be set arbitrarily, and the pitch P of each of the plurality of light receiving portions is set to the plurality of recording surfaces 28a in the recording layer 28 of the recording medium 26. , 28b, 28c and the optical characteristics of the plurality of light receiving portions are different from each other, they can be correspondingly different from each other.

Further, instead of forming the light receiving surface LR by a plurality of light receiving portions, a position sensor diode (PS) capable of detecting the position where the light is projected on the light receiving surface LR.
D).

Further, the number of recording surfaces in the recording layer 28 of the recording medium 26 can be set arbitrarily.

Further, with the collimator lens 36 fixed, the focusing of the spot P2 of the guiding light with respect to the target surface GS of the recording medium 26 is performed only by moving the objective lens 24 immediately above the recording medium 26, and the collimator of the recording / reproducing light is used. By using the lens 12 as a collimator lens similar to the collimator lens 36, the collimator lens instead of the collimator lens 12 can be moved in the direction along the optical axis by an optical element support device having the same configuration as the optical element support device 100, and the recording medium 26 Desired recording surface 28 of the recording layer 28 of
Focusing of the spot P1 of the recording / reproducing light with respect to a, 28b, or 28c is performed by moving the objective lens 24 immediately above the recording medium 26 and the optical element supporting device 100 as described above.
It is also possible to configure by performing the above-mentioned movement of the collimator lens instead of the collimator lens 12 by the optical element supporting device having the same configuration as described above.

Further, in the above-described embodiment, the above-mentioned detector is used to detect the relative position of the collimator lens 36 for the guide light, but those skilled in the art can use the collimator lens 36. The above-mentioned detector can be used to detect the moving speed and acceleration, and can also be used to detect the relative position and / or moving speed and acceleration of the objective lens 24 and other moving members. You can also

Further, the configuration of the optical system in the information recording and / or reproducing apparatus for recording and / or reproducing information using light and the method of detecting an operation error can be variously changed within the range known to those skilled in the art.

Next, with reference to FIGS. 1, 9 and 10, the optical element supporting device 10 according to the embodiment of the present invention.
The characteristic configuration of 0 will be described in detail.

Here, FIG. 9 shows a movement amount Z in the direction along the optical axis OA of the collimator lens 36, which is a kind of optical element supported by the optical element support device 100.
And the movable part 100 supporting the collimator lens 36.
FIG. 6 is a diagram showing a relationship between a movement amount S of a collimator lens 36 in a direction in which a pair of leaf springs of a supporting portion 100c that supports a so as to be movable in a direction along an optical axis OA;
FIG. 10 is a diagram schematically showing how the movement of the collimator lens 36 in the optical axis direction causes the movement of the collimator lens 36 in the extending direction of the pair of leaf springs of the support portion 100c.

In FIG. 1, a collimator lens 3 which is a kind of optical element supported by the optical element supporting device 100.
6 is located in the middle of ± 1 mm which is the moving range in the direction along the optical axis OA of itself. Here, the optical axis OA of the collimator lens 36 is the same as the collimator lens 3
In the extending direction of the pair of leaf springs of the support portion 100c that supports the movable portion 100a that supports 6 so as to be movable in the direction along the optical axis OA, project from the LD for guide 32 toward the collimator lens 36. The distance SO is away from the optical axis 38 of the guided light flux.

In this way, the position of the movable portion 100a in the extending direction when the collimator lens 36 is located in the middle of the moving range in the direction along the optical axis OA of itself is the first position. Further, the position of the movable portion 100a in the extending direction when the collimator lens 36 is located at both ends of the moving range in the direction along the optical axis OA of itself is the second position.

When the collimator lens 36 moves in the direction along the optical axis OA of the collimator lens 36 from the intermediate position, the movable portion 100a holding the collimator lens 36 moves to the support portion 10.
Fixed portion 100b in the extending direction of the pair of leaf springs 0c
Move slightly in the direction of approaching. In FIG. 9, the movement amount Z when the collimator lens 36 moves from the intermediate position in the direction along the optical axis OA of the collimator lens 36, and the movable portion 100a holding the collimator lens 36 at this time are shown in FIG.
A moving amount S of the pair of leaf springs 0c, which moves in the extending direction,
The relationship is shown. In this embodiment, the fixed portion 1
The extension length L of the pair of leaf springs of the support portion 100c from 00b to the movable portion 100a is 10 mm, and the range in which the collimator lens 36 moves in the direction along the optical axis OA of the collimator lens 36 is ±. It is set to 1 mm.

At the intermediate position, the collimator lens 3
The optical axis OA of its own 6 is one of the supporting portions 100c supporting the movable portion 100a holding the collimator lens 36.
In the extending direction of the pair of leaf springs, when the light flux of the guide light projected from the guide LD 32 toward the collimator lens 36 coincides with the optical axis 38, the collimator lens 36 is aligned with its own optical axis OA. The movable portion 100a, which holds the collimator lens 36 by moving ± 1 mm in the direction along the direction, moves the guide light beam in a direction approaching the fixed portion 100b in the extending direction of the pair of leaf springs of the support portion 100c. It is displaced 0.06 mm from the optical axis 38.

Here, the focal length of the converging lens 36 on the guide LD 32 side is set to M, and the supporting portion 100c is formed.
Let S be the distance of displacement of the movable part 100a (that is, the collimator lens 36) from the intermediate position in the extending direction of the pair of leaf springs. Then, by moving the collimator lens 36 in the direction along the optical axis OA of itself, the collimator lens 36 moves from the intermediate position in the extending direction of the pair of leaf springs of the support portion 100c together with the movable portion 100a by the distance S. When deviated, the optical axis 3 of the light beam emitted from the collimator lens 36 arranged at the intermediate position
8, the collimator lens 36 having the above-mentioned positional deviation
The inclination α of the optical axis 38 'of the light beam emitted from can be calculated by the following formula.

Α = tan ⁻¹ (S / M) That is, the focal length M of the collimator lens 36 is, for example, 12
mm, and when the collimator lens 36 moves ± 1 mm which is the maximum moving distance in the direction along the optical axis OA of itself, the movable portion 100 holding the collimator lens 36.
a causes a displacement of 0.06 mm (distance S) from the optical axis 38 of the light flux of the guide light in the direction of approaching the fixed portion 100b in the extending direction of the pair of leaf springs of the support portion 100c. At this time, the above inclination is α = tan ⁻¹ (0.0
6/1) = 0.29 degrees. As a result, the optical axis 38 of the guide light that has reached the objective lens 24 located immediately above the recording medium 26 from the collimator lens 36 via the polarization beam splitter 20 and the reflecting mirror 22 as shown in FIG. ′ Indicates that when the collimator lens 36 is arranged at the intermediate position, the collimator lens 36 at the intermediate position is directly above the recording medium 26 via the polarization beam splitter 20 and the reflecting mirror 22 as shown in FIG. Compared with the optical axis 38 of the guide light that has reached the objective lens 24 located at, the tangential direction TG moves.

Here, the focal length of the objective lens 24 is set to 3 mm.
Then, the collimator lens 36 has a maximum movement distance of ± 1 m from the intermediate position in the direction along the optical axis OA of itself.
A position shift of 0.06 mm (distance S) was caused from the optical axis 38 of the light flux of the guide light in the direction of approaching the fixed portion 100b in the extending direction of the pair of leaf springs of the support portion 100c by moving m. At times, on the guide surface GS (see FIG. 3) of the recording medium 26, the light spot P2 of the guide light has the collimator lens 36 disposed at the intermediate position in the direction along the optical axis OA of the collimator lens 36 and the supporting portion 100c. Guide light on the guide surface GS (see FIG. 3) of the recording medium 26 when its own optical axis OA coincides with the optical axis 38 of the light flux of the guide light in the extending direction of the pair of leaf springs. Light spot P
From 2, 15μm = tan in tangential direction TG
Displacement is caused by 0.29 × 3 mm.

Optical Element Supporting Device 10 According to the Present Invention
At 0, the collimator lens 36 has its own optical axis OA.
When the optical axis OA is in the intermediate position in the extending direction of the pair of leaf springs of the supporting portion 100c when the maximum moving distance is moved from the intermediate position in the direction along the direction.
Of the optical axis OA of the recording medium 26 (that is, the distance by which the light spot P2 of the guiding light on the guide surface GS of the recording medium 26 (see FIG. 3) causes the positional displacement in the tangential direction TG). ) Has been devised to reduce it as much as possible.

The contrivance is that when the collimator lens 36 is arranged at the intermediate position of the moving range in the direction along the optical axis OA of itself, the optical axis OA of itself is the guiding LD.
When the collimator lens 36 moves from the intermediate position to the maximum moving distance in the direction along the optical axis OA of the collimator lens 36 with respect to the optical axis 38 of the light flux of the guide light that is incident on the collimator lens 36 from 32, 1 of the supporting portion 100c is obtained. The optical axis O of the converging lens 36 at the intermediate position in the extending direction of the pair of leaf springs
That is, it is arranged in a direction away from the fixed portion 100b in the extending direction of the pair of leaf springs of the supporting portion 100c by a half of the distance S that causes the positional deviation from A (SO in FIG. 1).

As a result, as shown in the scale on the right side of FIG. 9, in the optical element supporting device 100 according to the invention of the present application, the collimator lens 36 has the above-mentioned intermediate in the direction along the optical axis OA of itself. When the optical axis OA is moved by ± 1 mm which is the maximum moving distance from the position, the optical axis OA is displaced from the optical axis OA of the collimator lens 36 at the intermediate position in the extending direction of the pair of leaf springs of the supporting portion 100c. The distance S becomes ± 0.03 mm. That is, as a result, the distance by which the light spot P2 of the guide light on the guide surface GS (see FIG. 3) of the recording medium 26 is displaced in the tangential direction TG is reduced, and as a result, the guide surface GS in the recording medium 26 is reduced. The followability of the light spot P2 of the guide light with respect to the desired track 27a above is improved, and the desired recording surface 28a, 2 in the recording layer 28 in the recording medium 26 is improved.
The trackability of the light spot P1 of the recording / reproducing light with respect to the desired track 28t in 8b and 28c is improved. Then, the desired recording surface 28 in the recording layer 28 in the recording medium 26
It is possible to record stable information on the desired track 28t in a, 28b, and 28c and / or reproduce it from the desired track 28t.

In this embodiment, the converging lens 36 is described as an optical element supported by the optical element supporting device according to the present invention. However, according to the idea of the present invention, the optical element is an objective lens or laser oscillation. It can be a machine or various other optical components.

Further, the driving means of the optical element supporting device according to the present invention is not limited to the combination of the coil CL and the permanent magnet PM in the above-mentioned embodiment,
A bimetal whose both ends are fixed to the fixed portion and the movable portion may be used.

Further, the optical element supporting device according to the present invention is not limited to one that supports the movable portion so as to be movable in one direction, but the movable portion is supported so as to be movable in a plurality of directions. It may be one that exists.

Further, the optical element supporting device according to the present invention may be a link in which the supporting portion is connected by a resin hinge, or the both ends are fixed to the fixed portion and the movable portion is inside. A double-supported beam supporting system that is connected may be used.

Further, the information recording and / or reproducing apparatus using the optical element supporting device according to the present invention can be used for a recording medium having a single recording surface, Recording of information on the desired recording surface and / or
Alternatively, a single light spot may be used to reproduce information from a desired recording surface.

[0104]

As is clear from the above description,
According to the optical element supporting device according to the present invention, even if the optical element is moved, the angle of inclination of the optical axis of the light beam after passing through the optical element with respect to the optical axis of the light beam before entering the optical element is small. Moreover, the external dimensions of the device are not increased and the weight is not increased.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing an optical system of an information recording and / or reproducing apparatus using an optical element supporting device according to an embodiment of the present invention.

FIG. 2 is a side view schematically showing a part of the optical system of FIG. 1 in an enlarged manner from a side.

FIG. 3 is a side view showing a further enlarged view of the optical disc and the objective lens shown in FIG.

FIG. 4 is an enlarged perspective view of an optical element support device of an optical system of an information recording and / or reproducing apparatus using the optical element support device according to the embodiment of FIG.

5 is a cross-sectional view taken along the optical axis of the collimator lens of the optical element support device of FIG.

FIG. 6 is an exploded perspective view of the optical element support device of FIG.

FIG. 7 is a front view showing the optical element support device of FIG. 4 from the side opposite to the guide LD in the direction along the optical axis of the collimator lens.

FIG. 8 is a diagram showing a configuration of a detection substrate of the optical element supporting device of FIG. 4 and a first optical axis of a collimator lens detected by the detection substrate.
It is a figure which shows schematically the collimator lens position signal which shows the position in the direction of.

FIG. 9 shows the amount of movement of a collimator lens, which is a type of optical element supported by an optical element support device, in the direction along the optical axis of the collimator lens, and the movable portion supporting the collimator lens. It is a figure which shows the relationship with the movement amount of the collimator lens in the extension direction of a pair of leaf springs of the support part movably supported in the optical axis direction.

FIG. 10 is a diagram schematically showing how the movement of the collimator lens in the optical axis direction causes the movement of the collimator lens in the extending direction of the pair of leaf springs of the support portion.

[Explanation of symbols]

36 Collimator lens (optical element) 38 Optical axis 100 optical element support device 100a movable part 100b fixed part 100c support CL coil (drive unit) PM Permanent magnet (drive unit)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-35317 (JP, A) JP-A-9-54969 (JP, A) JP-A-60-13333 (JP, A) JP-A-61- 111897 (JP, A) JP-A-6-31360 (JP, A) JP-A-2000-186925 (JP, A) Actually developed 60-92182 (JP, U) International publication 96/018190 (WO, A1) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) G02B ^7/ 02-7/10 G11B ^7/ 09-7/10

Claims (2)

(57) [Claims] 1. A movable part having an optical element, the movable part being fixed at least along an optical axis of the optical element.
A support member that movably supports in the first direction and a drive unit that drives the movable portion in the first direction, and after entering the optical element and passing through the optical element. In the optical element support device, wherein the light flux of is formed on the recording medium by the objective lens, the support member extends from the movable portion toward the fixed portion, and is supported in a cantilever manner with respect to the fixed portion. Tozaka from Oite the fixed part in the middle of the movement range of the movable portion in one direction from the optical axis of the light beam optical axis of the optical element is incident on the optical element in the extending direction of said supporting member
The optical element support device is characterized in that the optical element support device is deviated in the direction . 2. The movable part is arranged at a first position in the extension direction of the support member in the middle of the movement range, and the fixed part is extended in the extension direction at both ends of the movement range. Is disposed at a second position close to the position, and the movable portion is disposed between the first position and the second position in the extension direction between the middle and both ends of the moving range. The optical element support device according to claim 1, wherein the optical axis of the optical element coincides with the optical axis of the light beam incident on the optical element during the period.