JP2835015B2 - Optical information recording or reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording disk of a plurality of standards, in which a laser beam emitted from a laser light source corresponding to a predetermined optical information recording disk is transmitted by an objective lens corresponding to the laser beam. The present invention relates to a compatible optical information recording / reproducing apparatus which collects light and records or reproduces information. More specifically, the present invention relates to an optical information recording disk such as a compact disk (CD), and an optical information recording disk or a CD having a shorter distance from an optical pickup side disk surface to an information recording surface than a CD. In order to be able to reproduce information from different types of optical information recording disks such as optical information recording disks with a higher recording density,
An objective lens for a CD, an objective lens for a different type of optical information recording disc having a different numerical aperture, etc., and a CD-R
Compatible optical information that uses an OM laser light source and a laser light source that is suitable for different types of optical information recording disks, and that can condense each laser beam with an objective lens corresponding to it and reproduce information, etc. It relates to a recording or reproducing device.

[0002]

2. Description of the Related Art With the advance of multimedia, a high-density, large-capacity recording medium capable of recording a large amount of information such as digitized still images and moving images such as moving images is required. The optical information recording disk has advantages such as being a medium capable of handling high-density and large-capacity information, and being easy to freeze, frame-forward and random-access an image. Optical information recording disks for recording digitized information are classified into a read-only type, a write-once type, and a rewritable type based on the recording principle. Playback only type is CD, C
It is widely used as a D-ROM or the like. In the write-once type,
There are a drilling method, a phase change method, a bubble forming method, and the like, and the drilling method is frequently used. For rewritable types,
There are a magneto-optical type, a phase change (crystalline amorphous transformation) type, an organic dye type, and the like. Of these, a magneto-optical type disk is frequently used. FIG. 11 shows the principle of a CD-ROM, a write-once disc, and a magneto-optical disc. CD-ROM is
As shown in FIG. 11A, a laser beam having a predetermined wavelength is converged and irradiated on an uneven pit formed on the disk surface by an objective lens having a predetermined numerical aperture, as shown in FIG. It detects the intensity of the reflected light and reproduces the information recorded on the disk. The write-once disc is capable of recording only once, and is shown in FIG.
As shown in FIG. 11B, a laser beam having a predetermined wavelength is converged and irradiated by an objective lens having a predetermined numerical aperture, a pit hole is formed in a disk to record information, and FIG.
As shown in FIG. 2, the intensity of reflected light is detected to reproduce information recorded on a disk. The magneto-optical disk is writable and erasable. As shown in FIG. 11D, a laser beam having a predetermined wavelength is converged and irradiated by an objective lens having a predetermined numerical aperture to reduce the coercive force. Information is recorded by reversing the direction of perpendicular magnetization by applying a magnetic field while decreasing the frequency, and information is recorded as shown in FIG.
By irradiating a laser beam, the information is reproduced by detecting the rotation of the polarization plane of the reflected light using the Kerr effect based on the difference in the perpendicular magnetization direction.

[0003] In these optical information recording disks, increasing the diameter of the disk is the simplest solution for recording a long-time video or the like, but the information recording or reproducing apparatus does not increase in size. Therefore, it is not preferable as a personal use information device because the handling of the disk is not good. Therefore, it is appropriate to improve the recording density on the disk without changing the diameter of the disk. For example, a unified standard,
Read-only CD-ROs manufactured and used in large quantities
M has a capacity capable of storing about 600 Mbytes of digital information on a disc having a diameter of 120 mm and a thickness of 1.2 mm. With this capacity, video data can be transferred even if data compression is performed by the MPEG2 method. Recording can be performed for only about 20 minutes at a rate of 4 Mbps, and it cannot be said that this state is sufficient for adapting to multimedia. Therefore, it is necessary to improve the recording density of information on a disk having the same diameter as a CD-ROM so that a larger amount of information can be handled. For this purpose, it is only necessary to increase the numerical aperture (NA) of the objective lens and shorten the wavelength of the laser beam for reproduction. In a CD-ROM, the numerical aperture (NA) of the objective lens is 0.45, the wavelength of the laser beam is 780 nm, and the spot diameter is 1.6 μm. NA 0.6, laser light wavelength 635
nm, and the spot diameter is 0.9 μm, the CD
-A pit smaller in size than a pit of a ROM can be read, and a CD-ROM having the same diameter as a CD-ROM is read.
It is possible to record and reproduce information of about six times the capacity of ROM. If the signal recording method is further changed, about 8 times,
Recording and reproduction of a large amount of information of about 5 Gbytes can be performed. By increasing the numerical aperture of the objective lens, the laser beam can be narrowed down to a narrower beam waist. It is difficult to read information without error. Therefore, it is necessary to shorten the distance from the surface of the disk to the information recording surface so that information can be read without errors. Disc warpage and undulation are considered to be caused by residual stress during molding of the disc, disturbance in a minute area of the disc material, and the like generated by heat generated in the reproducing apparatus. It is difficult to completely eliminate the occurrence of the problem. The tilt angle of the disk due to the warpage, undulation, etc. of the disk on the system is ± 0.6 ° for CDs and CD-ROMs, and must be kept within this range. FIG. 12A shows that the distance from the disk surface (C) of the CD-ROM to the information recording surface (D) is 1.2 mm,
The case where the numerical aperture of the objective lens (E) is 0.45 is shown. Here, it is assumed that the laser beam is converged by the objective lens (E) and is irradiated on the flat information recording surface (D) of the disc (F). Then, it is assumed that the disk (F) is inclined by α degrees to become the disk surface (C1) and the information recording surface (D1), and that the intersection of the optical axis center line and the information recording surface (D) is P. The optical path length in the disk to the left of the optical axis center line is P
-R changes from P-R1, R-R1 becomes longer, and the optical path length in the disk on the right side of the optical axis center line changes from PS to P-S1.
, And when S-S1 becomes shorter, the spot intensity of the laser beam at the point P on the information recording surface (D) changes from FIG. 12 (b) to FIG. 12 (c), and accurate information reading is performed. Can not be done. On the other hand, FIG. 13A shows that the distance from the disk surface (G) to the information recording surface (H) is 0.6 m.
m and the numerical aperture of the objective lens (I) is 0.6. Here, it is assumed that the laser light is converged by the objective lens (I) and is irradiated on the flat information recording surface (H) of the disc (J). Then, it is assumed that the disc (J) is inclined by α degrees to become the disc surface (G1) and the information recording surface (H1), and the intersection point between the optical axis center line and the information recording surface (H) is V. The optical path length in the disk on the left side of the optical axis center line is V
From -X to V-X1, the length becomes XX1, and the optical path length in the disk on the right side of the optical axis center line V-W is V-Y to V-X1.
−Y1, the spot intensity of the laser light at the point V on the information recording surface (H) of the laser light changes from FIG. 13B to FIG. Information can be read without error. By the way, as shown in FIG. 14, the program recording area in the CD-ROM (2) starts from the inner peripheral end (101) of the program recording area at a position of a radius of 25 mm from the center of the disc and extends to a radius of 58 mm. The range between the outer peripheral end (102) and the outer peripheral end (102) is standardized, and there is some room for a recordable area between the center hole (103) and the inner peripheral end (101) of the program recording area. As shown in FIG. 15, from the center of the disk (3) to the inner peripheral end (104) of the program recording area.
Distance to a CD-ROM, such as 23 mm
By increasing the recordable area shorter than 25 mm, the numerical aperture (NA) of the objective lens as described above is increased, and the recording density is improved by shortening the wavelength of the laser beam for reproduction. In addition, it is preferable because the recording capacity of the entire disc can be increased. Recording information by increasing the numerical aperture (NA) of the objective lens, shortening the wavelength of the laser beam for reproduction, and shortening the distance from the center of the disk to the program recording area with the same disk diameter as the CD-ROM. Optical information recording disks with dramatically increased densities are being studied as DVDs (Digital Video Disks), high-density CD-ROMs, etc., including standardization of standards. Especially, 120mm in diameter and the thickness of the disc is the current CD, CD-ROM
Is 0.6 mm, the distance from the center of the disk to the inner edge of the program recording area is 24 mm, the numerical aperture (NA) of the objective lens is 0.6, and the wavelength is 650 nm or 6.
A large-capacity disc having an information recording capacity of about 5 Gbytes capable of reproducing recorded information with a 35-nm laser beam is referred to as an SD (super-density disc), having a diameter of 120 mm and a disc thickness of CD,
1.2 mm which is the same as the CD-ROM, the distance from the center of the disk to the inner peripheral edge of the program recording area is 23 mm, the numerical aperture (NA) of the objective lens is 0.52, and the wavelength is 635.
A disc having an information recording capacity of about 3.7 Gbytes capable of reproducing recorded information with a laser beam of nm is being studied as an HDCD (High Density Compact Disc). Since both CD-ROMs and DVDs have the same diameter, manufacturing a playback device for a CD-ROM and a playback device for a DVD, etc., requires parts such as drive means having a similar or similar structure. Is used for the device, and the manufacturing cost is increased. In addition, from the user's standpoint, only the installation space for a read-only optical information recording disk device is required for two units. To support multimedia, other information recording disks such as floppy disks are required. It is necessary to expand the input / output devices such as image scanners and image scanners. Therefore, similar devices such as read-only type optical information recording disk devices with at least the same disk diameter can be used as one compatible device. Preferably, it is possible to do so. In order to achieve compatibility, it is necessary to share parts, reduce manufacturing costs, and save space and make it easy to use. For this purpose, for example, it is preferable that the optical pickup, the guide rail, and the driving means for sliding the optical information recording disk of the optical pickup in the radial direction can be shared. This is the case with different types of read-only optical information recording disk reproducing devices such as CD-ROMs and DVDs. However, the present invention is not limited to this. Recording / reproducing device for type information recording disks, recording / reproducing device for different types of rewritable optical information recording disks, or multi-type capable of using read-only, write-once, rewritable optical information recording disks It is also applicable to optical information recording or reproducing devices of the type. Further, the same applies to optical information recording disks having different diameters.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention is directed to a CD-ROM which is expected to occupy an important recording medium in multimedia.
In order to be able to reproduce and record information from a plurality of types of optical information recording disks such as ROM and DVD, the used components should be shared, the structure should be simplified, and the number of components should be reduced. In addition, by reducing the number of moving parts, there is little interference with other parts, the occupied area is small, the manufacturing cost is low, the failure is small, the repair is easy, and the running cost such as energy consumption is low. It is an object of the present invention to provide a compatible optical information recording or reproducing apparatus which can cope with multimedia which is space-saving and easy to use.

[0005]

In order to solve the above-mentioned problems, an optical information recording or reproducing apparatus according to the present invention comprises:
A plurality of objective lenses designed according to a plurality of types of optical information recording disks, and a plurality of laser light sources respectively corresponding to the plurality of objective lenses, the optical axes of the plurality of objective lenses are parallel, and , The optical axes of multiple objective lenses,
The optical pickup is arranged on the optical pickup so that the optical axis of the laser beam emitted from the laser light source corresponding to each objective lens and passing through each objective lens coincides with the optical axis. (Ii) A plurality of objective lenses may be juxtaposed to the optical pickup in a direction orthogonal to the sliding direction of the optical pickup. In the juxtaposition, the plurality of objective lenses are orthogonal to the sliding direction of the optical pickup. The optical information recording disk is provided in parallel with the optical pickup at an angle to the direction, and a distance corresponding to a component in a sliding direction of the optical pickup of a line connecting the optical axes of a plurality of objective lenses has a plurality of standards. May correspond to the difference in the distance from the center of the disc to the inner peripheral edge of the program recording area. (Iii) an optical pickup, a sliding guide mechanism for sliding the optical pickup, a single rotation driving means for supporting and rotating an optical information recording disk on a support surface of a turntable, and the sliding guide mechanism In the direction perpendicular to the sliding direction of the optical pickup, the relative positional relationship between the rotation driving means and the optical pickup is determined by a distance corresponding to the component of the line connecting the optical axes of the plurality of objective lenses in the direction perpendicular to the optical pickup. A switching mechanism for changing the optical axis of the objective lens by the sliding of the optical pickup by the sliding guide mechanism and the radial direction of the optical information recording disk supported on the support surface of the turntable. It is preferable that the objective lens is selectively switched by the switching mechanism so as to coincide with each other. In order to switch the relative positional relationship between the rotation drive unit and the optical pickup, two methods, a method of changing the position of the rotation drive unit and a method of changing the position of the optical pickup, can be adopted. A structure comprising a support substrate which supports the rotation driving means and can be moved in parallel in a direction perpendicular to the sliding direction of the optical pickup by the sliding guide mechanism, a surface which supports the rotation driving means and is orthogonal to the optical axis of the objective lens by a pivot. A structure consisting of a support substrate rotatably supported within,
Further, it is possible to employ a structure including a support substrate having a slide guide mechanism of the optical pickup and capable of moving in parallel in a direction orthogonal to the sliding direction of the optical pickup by the slide guide mechanism. (Iv) The focus direction and the track direction of the objective lens are preferably controlled by a two-dimensional actuator. Specifically, (a) a plurality of objective lenses are controlled in a focus direction and a track direction by a common actuator. Such a structure can be employed. In this case, (a) a plurality of objective lenses integrally molded can also be employed. Also, (c) a plurality of objective lenses
The structure may be such that it is controlled in the focus direction and the track direction by independent actuators. (V) The objective lens can be a combination of objective lenses suitable for optical information recording disks of a plurality of standards, such as those suitable for CD-ROM, SD, HDCD, and the like. For example, in the case of a combination of two types of objective lenses, a combination of an objective lens for a CD or CD-ROM with a numerical aperture of 0.45 and an objective lens for an SD with a numerical aperture of 0.6, or a numerical aperture of 0 It is possible to combine a 0.52 HDCD objective lens with a 0.6 numerical aperture SD objective lens. If one objective lens can support optical information recording discs of a plurality of standards, the number of objective lenses can be reduced accordingly. When two types of optical information recording disks are the same and have the same diameter, the rotation driving means determines that the diameter of the first optical information recording disk and the diameter of the second optical information recording disk are different. An optical information recording disk having the same diameter is supported on a support surface of a turntable. In the case of an optical information recording disk for a CD-ROM, a DVD, or the like having a diameter of 120 mm, The rotation driving means can support these disks. (Vi) It is preferable that detection means for detecting the type of the optical information recording disc of a plurality of types of standards is provided.
As a specific detecting means therefor, it is preferable to use a non-contact type optical detector comprising a light emitting element and a number of light receiving elements corresponding to the type of the optical information recording disk. In the case of an optical information recording disc having a different distance from the surface to the information recording surface, the detecting means for detecting the type of the optical information recording disc includes a light emitting element and information recording from the disc surface of the optical information recording disc. It is desirable that the non-contact type optical detector includes a number of light receiving elements corresponding to the type of the optical information recording disk for detecting a difference in distance to the surface. Various detectors can be selected depending on what kind of optical information recording discs and how to combine and reproduce them,
It is not limited to the above. Note that optical information recording disks include CDs, CD-ROMs, DVDs, and the like.
It is not limited to the read-only type as described above, but may be a write-once type or rewritable type optical information recording disk.

[0006]

According to (i), in order to record or reproduce information from a predetermined optical information recording disk of a plurality of types of optical information recording disks, it is necessary to correspond to the predetermined optical information recording disk. A laser beam emitted from a laser light source is passed through an objective lens corresponding to the laser beam, focused on the optical information recording disk, and the optical axis of the objective lens is changed by sliding an optical pickup. The disc is moved in accordance with the radial direction of the recording disk.
For another optical information recording disk having a different standard from the optical information recording disk, a laser beam emitted from a laser light source corresponding to the optical information recording disk is used as an objective lens corresponding to the laser beam. Let through
The optical information recording disk is condensed, and the optical axis of the objective lens is moved in accordance with the radial direction of the optical information recording disk by sliding of an optical pickup to record or reproduce information. it can. (Ii) When a plurality of objective lenses are arranged in parallel with the optical pickup in a direction perpendicular to the sliding direction of the optical pickup, the position of each objective lens at the inner peripheral end position of the program recording area of each optical information recording disc is adjusted. There is no significant difference in access. Further, a plurality of objective lenses are arranged in parallel with the optical pickup so as to be inclined with respect to a direction orthogonal to the sliding direction of the optical pickup, and the sliding direction of the optical pickup of a line connecting the optical axes of the plurality of objective lenses is provided. If the distance corresponding to the component is equivalent to the difference in the distance from the center of the optical information recording disc of a plurality of types of discs to the inner peripheral edge of the program recording area, each optical information recording disc of each objective lens If the initial position of the optical pickup is set at a position corresponding to the inner peripheral edge of the program recording area, access to the inner peripheral edge position of the program recording area becomes unnecessary. According to (iii), when information is recorded or reproduced from a predetermined optical information recording disk of a plurality of types of optical information recording disks, a predetermined value is determined by sliding the optical pickup along a sliding guide mechanism. Moving direction of the optical axis of the objective lens,
If the radial direction of the predetermined optical information recording disc supported by the turntable does not match, by the switching mechanism, in the direction orthogonal to the sliding direction of the optical pickup,
By changing the relative positional relationship between the rotation driving means and the optical pickup by a distance corresponding to the component in the orthogonal direction of the line connecting the optical axes of the plurality of objective lenses, the predetermined objective by sliding of the optical pickup is changed. The direction in which the optical axis of the lens moves corresponds to the radial direction of the optical information recording disk supported on the support surface of the turntable. Next, a laser beam emitted from a laser light source corresponding to the optical information recording disk is passed through an objective lens corresponding to the laser beam, and focused on the optical information recording disk. In addition, information can be recorded or reproduced by moving the optical axis of the objective lens so as to coincide with the radial direction of the optical information recording disk.
A structure as a switching mechanism, comprising a support substrate that supports rotation driving means and can move in parallel in a direction perpendicular to the sliding direction of the optical pickup by the sliding guide mechanism, supports the rotation driving means, and controls light of the objective lens by a pivot. A structure comprising a supporting substrate rotatably supported in a plane perpendicular to the axis, and a sliding guide mechanism for the optical pickup, wherein the optical pickup has a sliding guide mechanism parallel to a direction perpendicular to a sliding direction by the sliding mechanism. Since the structure including the movable support substrate has a simple structure and does not require ultra-precise processing accuracy, the manufacturing cost of parts is low, the assembly is easy, the failure is small, and the durability is good. By the switching mechanism, the distance between the rotation driving unit and the optical pickup is set in a direction corresponding to a component of the line connecting the optical axes of the plurality of objective lenses in the direction orthogonal to the sliding direction of the optical pickup. By changing the positional relationship, the direction in which the optical axis of the predetermined objective lens moves due to sliding of the optical pickup coincides with the radial direction of the optical information recording disk supported on the support surface of the turntable. As a result, information can be accurately reproduced from a predetermined optical information recording disk supported on the support surface of the turntable. Here, this will be described with reference to FIGS. 16, 17 and 18 by taking as an example the operation of reproducing information from an optical information recording disk by the three-beam method. In the three-beam method, a laser beam emitted from a semiconductor laser (111) is split by a diffraction grating (112) into a main beam that travels straight, and three beams of + 1st-order and -1st-order diffracted light. , Collimated by a collimator lens (113), passed through a polarizing beam splitter (114), a quarter-wave plate (115), condensed by an objective lens (116), and recorded on the information recording surface of an optical information recording disc. Is irradiated. The reflected light from the information recording surface of the optical information recording disk is transmitted to the objective lens (116), 1
The light passes through the 波長 wavelength plate (115), is reflected by the polarizing beam splitter (114), passes through the condenser lens group (117), and is focused on the sensor (118) (see FIG. 16). ). As shown in FIG. 17, the optical axis of the objective lens is moved along the radial direction (R direction) of the disk, and information from the pit (120) recorded on the optical information recording disk by the main beam (119) is obtained. Is read by the photodiode (121). And
The + 1st-order diffracted light and the -1st-order diffracted light are converted into sub beams (119
a) and (119b) are pits (122) and (123) at appropriate positions before and after the pit (120) in the track direction.
The reflected light of the sub beam from the photodiode (12)
4) and (125), the difference between them is taken out as a tracking error signal, the deviation of the main beam (119) from the track is detected, and tracking control is performed so that no difference occurs between the two signals. Beam (119)
Thus, information can be accurately read from the pits (120) recorded on the optical information recording disk. FIG. 18 shows the radial direction (R direction) of a predetermined optical information recording disk supported by the rotation driving means and the trajectory (L direction) of the optical axis of the objective lens corresponding to the optical information recording disk. When the optical pickup is displaced by e and becomes parallel without being coincident as shown in FIG.
The tracking error signal from the first-order diffracted light does not reflect the information that the main beam (119) is at a predetermined position for reading the predetermined pit (126), and may perform unnecessary tracking control. The information cannot be accurately read from the pit (126) recorded on the optical information recording disk by the main beam (119). Therefore, as described above, the support substrate is moved by the switching mechanism so that the optical axis of the laser beam and the optical axis of the objective lens suitable for a predetermined optical information recording disk among the plurality of objective lenses coincide with each other. The objective lens is switched by the selective movement by the switching mechanism, and the direction in which the optical axis of the objective lens moves by sliding the optical pickup along the sliding guide mechanism is the optical information recording supported on the support surface of the turntable. The optical pickup is slid by a sliding guide mechanism by making it coincide with the radial direction of the disc, so that information can be accurately reproduced from a predetermined optical information recording disc supported by the rotary drive means. Can be done. As in (iv) of (iv),
If a plurality of objective lenses are controlled in the focus direction and the track direction by a common actuator, only one expensive and precise two-dimensional actuator is required, so that the manufacturing cost can be reduced and the optical pickup can be reduced. The space occupied by the optical pickup is small, and the optical pickup can be made lightweight and compact. In this case, as shown in (a), if the plurality of objective lenses are integrally molded, it is easy to manufacture a plurality of objective lenses whose optical axes are parallel, and the optical axes of the plurality of objective lenses are parallel. And it is easy to set it on the supporting substrate, which is preferable also from the viewpoint of manufacturing and assembling the device. Further, as shown in (c), when a plurality of objective lenses are controlled in the focus direction and the track direction by independent independent actuators, respectively, the individual objective lenses are moved in the focus direction and the track direction, respectively. Since the control is sufficient, the energy at the time of the control is sufficient for one objective lens, the response speed is fast, and the control can be performed accurately. Furthermore, when arranging a plurality of objective lenses on the support substrate, or adjusting the optical axis at the time of repair or the like can be performed individually, and at the time of repair, only the predetermined objective lens needs to be replaced. The maintenance cost for the objective lens can be reduced. According to (v),
A combination of a plurality of objective lenses corresponding to an optical information recording disk of a plurality of standards, such as a CD-ROM, an SD, an HDCD, etc., can be adopted as necessary. Information can be recorded or reproduced by a laser beam from a standard optical information recording disk. According to (vi),
By detecting the type of the optical information recording disc by the detecting means for detecting the type of the optical information recording disc of a plurality of types, the optical information recording supported on the support surface of the turntable is provided. The type of disc can be determined, and operations such as selection switching of an objective lens suitable for the disc type can be automatically performed.

[0007]

The present invention will be described below in more detail with reference to examples. Of course, the present invention is not limited by the following examples. Hereinafter, in the examples,
An optical information recording / reproducing apparatus for reproducing two types of optical information recording disks, a CD-ROM and a DVD, will be described. Here, for convenience of explanation, the CD-ROM has a diameter of 120 mm, a distance from the disk surface on the optical pickup side to the information recording surface is 1.2 mm, and a distance from the center of the disk to the inner peripheral edge of the program recording area is 25 mm. DVD has a diameter of 120 mm, the distance from the optical pickup side disk surface to the information recording surface is 0.6 mm,
A description will be given mainly of the case where the distance from the center of the disc to the inner peripheral edge of the program recording area is 23 to 24 mm. FIG.
In an optical information recording / reproducing apparatus (1) shown in FIG.
The (2) or DVD (3) is taken out of the storage case, placed alone on the common tray (4), and transferred to the playback position by a well-known loading mechanism (not shown). 2 and 3, an optical information recording disk, which is a CD-ROM or a DVD, is supported on a support surface of a turntable (5) by a well-known appropriate clamp mechanism (not shown). The pickup (6) is slid along the guide rail (7) to collect a laser beam from the objective lens (8) for CD-ROM or the objective lens (9) for DVD, and the information recording surface of the disk Information can be reproduced based on the reflected light.

FIGS. 2 and 3 (a) show a state in which the CD-ROM (2) is transported from the front and supported on the support surface of the turntable (5) of the spindle motor (10). The spindle motor (10) is held by a slide member (11). The slide member (11) moves along an axis of a guide rail (7) along a guide bar (12) provided on a base (not shown). It is possible to move in the direction orthogonal to. A rack (13) is provided laterally on the side of the slide member (11), and a pinion (15) for transmitting a rotational driving force from a switching motor (14) meshes with the rack (13). The pinion (15) is rotatably supported by a base and a switching motor (1).
4) is fixed to the base. On the upper surface of the base, a pair of guide rails (7) for sliding the optical pickup (6).
Is mounted on a fixed block (not shown), and the optical pickup (6) slides along the guide rail (7). The sliding direction of the optical pickup (6) along the guide rail (7) coincides with the moving direction of the optical axis of the objective lens (8) for CD-ROM and the radial direction of the disk supported by the turntable (5). It is supposed to. In order to slide the optical pickup (6) along the guide rail (7), a well-known sliding structure such as a sliding mechanism using a rack-pinion, a sliding mechanism using a screw, or a sliding mechanism using a linear motor may be used. The detailed description is omitted. A storage block (16) is provided on the upper surface of the optical pickup (6), and a DVD objective lens (9) and C
Objective lens (8) for D-ROM is guide rail (7)
Are arranged side by side in a direction orthogonal to the axis. Objective lens for DVD (9) and objective lens for CD-ROM (8)
Are integrally fixed to the support frame (17) at predetermined intervals. The support frame (17) is a component of a two-dimensional actuator (not shown) provided in the storage block (16). The two-dimensional actuator allows the DVD objective lens (9) and the CD-ROM.
The ROM objective lens (8) is integrally controlled in the focus direction and the track direction. Well-known principles and structures of the two-dimensional actuator can be employed, and a detailed description thereof will be omitted. In the state shown in FIG. 3A, the direction of movement of the optical axis of the objective lens (8) for CD-ROM caused by sliding along the guide rail (7) of the optical pickup (6) corresponds to the turntable (5). ) Corresponds to the radial direction of the disc supported. Therefore,
By sliding the optical pickup (6) along the guide rail (7), information recorded on the CD-ROM (2) can be reproduced by the laser beam from the objective lens (8) for CD-ROM. It has become. FIG.
In order to reproduce information from the DVD (3) in the state shown in (a), the pinion (15) is rotated clockwise by the switching motor (14), and the rack (13) is moved from the pinion (15). To the slide member (1)
1) is moved along the guide bar (12) downward in the drawing perpendicular to the axial direction of the guide rail (7), and the axis of the spindle motor (10) is moved to the CD-ROM.
Is moved linearly by a linear distance corresponding to the distance between the optical axis of the objective lens (8) for DVD and the optical axis of the objective lens (9) for DVD to change the state as shown in FIG. Thereby, the objective lens (9) for DVD by sliding along the guide rail (7) of the optical pickup (6).
Of the optical axis of the disc coincides with the radial direction of the disk supported by the turntable (5). Therefore,
In the state shown in FIG. 3B, by supporting the DVD (3) on the turntable (5), the optical pickup (6) is slid along the guide rail (7), and D
Information recorded on the DVD (3) can be reproduced by the laser beam from the VD objective lens (9). Conversely, in the state shown in FIG.
To reproduce information from the ROM (2), the pinion (15) is rotated counterclockwise by the switching motor (14) to transmit driving force from the pinion (15) to the rack (13), and (11) is linearly moved along the guide bar (12) in the upward direction in the drawing perpendicular to the axial direction of the guide rail (7), and the spindle motor (1) is moved.
The axis of 0) is moved by a linear distance corresponding to the distance between the optical axis of the objective lens (8) for CD-ROM and the optical axis of the objective lens (9) for DVD, as shown in FIG. Change to such a state.

As shown in FIG. 4, a semiconductor laser (20) for CD-ROM and a semiconductor laser (21) for DVD are arranged in the optical pickup (6).
An optical system for ROM and an optical system for DVD are configured. The optical system for CD-ROM and the optical system for DVD shown in FIG. 4 employ similar optical systems.
The OM objective lens (8) and the DVD objective lens (9) are fixed to and integrated with the support frame (17). In order to reproduce information recorded on the CD-ROM (2), in the state shown in FIG. 3A, the laser beam emitted from the semiconductor laser (20) is, as shown in FIG. (22), collimated by a collimator lens (23), and passed through a polarizing beam splitter (24) and a quarter-wave plate (25).
CD-RO focused by the objective lens (8) for D-ROM
The information recording surface of M (2) is irradiated. CD-ROM
The reflected light from the information recording surface of (2) passes through the objective lens (8) and the quarter-wave plate (25), is reflected by the polarizing beam splitter (24), and is collected by the condenser lens group (2).
6) and is focused on the sensor (27). In the sensor (27), the CD-RO is
A signal for reading information recorded in M (2) is obtained, and +
A tracking control signal is obtained by the first-order diffracted light and the -1st-order diffracted light. CD-ROM
When reproducing the information from (2), when the CD-ROM (2) is supported on the support surface of the turntable (5), the CD-ROM (2)
Disk surface and CD-R of ROM (2) on the objective lens side
The top surface of the CD-ROM objective lens (8) and the turntable (5) of the spindle motor (10) so that the working distance between the OM objective lens (8) is about 2 mm.
The position of the support surface is relatively adjusted (not shown). The adjustment of the working distance can be performed by, for example, a structure in which the position of the spindle motor (10) is raised and lowered (Japanese Patent Application No. Hei.
No. 64886), or an appropriate structure such as securing the elevation of the objective lens by a two-dimensional actuator can be adopted. On the other hand, in order to reproduce information recorded on the DVD (3), in the state shown in FIG. 3 (b), as shown in FIG. 5, the laser beam emitted from the semiconductor laser (21) is a diffraction grating. (28), is collimated by a collimator lens (29), and passes through a polarizing beam splitter (30) and a quarter-wave plate (31);
The light is condensed by the DVD objective lens (9) and is irradiated onto the information recording surface of the DVD (3). The reflected light from the information recording surface of the DVD (3) passes through the objective lens (9) and the quarter-wave plate (3
1), is reflected by the polarizing beam splitter (30), passes through the condenser lens group (32), and passes through the sensor (3).
3) Focused on top. In the sensor (33), an information readout signal is obtained by the main beam;
The tracking control signal is obtained by the first-order diffracted light and the -1st-order diffracted light, as in the case of FIG. DV
When reproducing information from D, DVD objective lens (9)
The working distance between the disc and the DVD (3) disk surface is 1 to
It is adjusted to be about 1.5 mm.

Since the objective lens (8) for CD-ROM and the objective lens (9) for DVD are driven integrally by the support frame (17) as described above, these lenses are integrally connected by plastic. It can also be manufactured by molding into a structured structure. FIG. 6 shows an optical system using a plastic lens (40) in which an objective lens (42) for CD-ROM and an objective lens (41) for DVD are integrally molded. FIG. 6A shows the time of reproduction of the CD-ROM (2), and FIG. 6B shows the time of reproduction of the DVD. These optical systems are not limited to these. FIG. 7A shows an integrally molded plastic lens (4).
It is a top view of (0). When reproducing the information recorded on the CD-ROM (2), the laser beam emitted from the laser diode (43) passes through the diffraction grating (44), as shown in FIG. The light is collimated by a collimator lens (45), passes through a polarizing beam splitter (46) and a quarter-wave plate (47), is collected by an objective lens (42), and is recorded on a CD-ROM (2). Irradiated on the surface. Next, the reflected light from the information recording surface of the CD-ROM (2) passes through the objective lens (42) and the quarter-wave plate (47), is reflected by the polarizing beam splitter (46), and is condensed. The light is collected on the sensor (49) by the group (48). In the sensor (49), a signal for reading information recorded on the CD-ROM (2) is obtained by the main beam, and a tracking control signal can be obtained by + 1st-order diffracted light and -1st-order diffracted light. . When reproducing information recorded on the DVD (3), as shown in FIG. 6B, the laser beam emitted from the laser diode (50) passes through the diffraction grating (51), and is collimated. The light is collimated by the lens (52), passes through the polarizing beam splitter (53) and the quarter-wave plate (54), is condensed by the objective lens (41), and is irradiated on the information recording surface of the DVD (3). You. Next, the reflected light from the information recording surface of the DVD (3) passes through the objective lens (41) and the quarter-wave plate (54), is reflected by the polarizing beam splitter (53), and is collected by a condenser lens group ( 55), the sensor (5
6) Focused on top. In the sensor (56), an information readout signal is obtained by the main beam;
The tracking control signal is obtained by the first-order diffracted light and the -1st-order diffracted light, as in the case of FIG. The plastic lens (40) in FIG.
As shown in (a), two rectangular resin support substrates are used.
Although the objective lenses are integrally molded, as shown in FIG. 7 (b), the optical axis (M20) of the small lens is formed at a position deviated from the optical axis (M10) of the large lens, thereby supporting the objective lens. The entire substrate may be a compound lens shaped to also serve as a large lens, and in order to manufacture such a compound lens, a part of the lens manufacturing technology employed in the manufacture of bifocal glasses must be diverted. Can be.

[0011] In order to enable reproduction of an SD having a distance of 0.6 mm from the disk surface to the information recording surface of a CD-ROM or DVD having a distance from the disk surface to the information recording surface of 1.2 mm, a CD-ROM is required. As a detector for discriminating between the ROM and the SD, it is possible to use a detector configured to detect a difference in the distance from the disk surface of these disks to the information recording surface. A non-contact optical detector can be used as a detector for detecting such a difference in the distance from the disk surface to the information recording surface. This non-contact optical detector includes a light emitting element (57) as shown in FIG. 8 and a first light receiving element (5) for CD-ROM detection.
8) and a second light receiving element (59) for SD detection. This is because the detection light from the light emitting element (57) is
The light is obliquely incident on the ROM (2) or the SD (3) and is reflected on the information recording surfaces (2a) and (3a).
The difference in the reflection position based on the difference in the information recording surface of (2) or SD (3) can be detected by the light receiving elements (58) and (59). A detection signal for detecting the type of the optical information recording disk is input to a controller (not shown), which starts the rotation of the spindle motor (10), switches the slide member (11), and operates the disk surface and the objective lens. The adjustment of the distance and the like are controlled. It should be noted that the detector for detecting the optical information recording disk is not limited to the above-described detector, and it goes without saying that a well-known detector can be used as appropriate. From the CD-ROM to the DV, by detecting the difference in the distance from the
A detector that can determine the type of D can be used.

The operation of reproducing information from an optical information recording disk by the optical information recording / reproducing apparatus having the above-described configuration will be described below. (I) [About CD-ROM] The optical pickup (6) is at an initial position near the turntable (5). The initial position can be set to any position, but the distance from the axis of the turntable (5) to the optical axis of the objective lens (8) for CD-ROM is smaller than that of the CD-ROM.
At the reading start position corresponding to 25 mm, which is the inner peripheral end of the program recording area, and the support surface of the turntable (5) is a CD.
-When the ROM (2) is supported and the CD-ROM objective lens (8) and the disk surface are set at a position where the working distance of the disk is 2 mm, the CD-ROM (2) is turned on the turntable ( When supported by the support surface of 5), the information can be reproduced from the CD-ROM (2) as it is. In such an initial position setting state, the CD-
The ROM (2) is placed on the tray (4) and loaded (see FIG. 1). When the CD-ROM (2) is transported from the front and supported on the support surface of the turntable (5), the type of the optical information recording disk is detected by the detector as described above. CD-R from detector
The detection signal indicating the OM is input to the control device.
Since there is no need to slide the optical pickup (6), the optical pickup (6) is maintained as it is. The CD-ROM (2) is supported on the support surface of the turntable (5), and the spindle motor (1)
0) is started, and the CD-ROM (2) is rotated. Next, the optical pickup (6) is slid along the guide rail (7) in the direction shown by the arrow in FIG. 3 (a), so that the objective lens (8) for CD-ROM and the disk surface have a length of 2 mm. CD-RO while maintaining working distance
The information recorded on the CD-ROM (2) is reproduced by the M objective lens (8). After the reproduction operation by the CD-ROM (2) is completed, the optical pickup (6) is controlled to return to the reading start position based on a command from the control device.

(II) [Regarding DVD] The optical pickup (6) is located near the turntable (5) and extends from the axis of the turntable (5) to the center of the optical axis of the objective lens (8) for CD-ROM. Distance is CD-RO
At a position corresponding to 25 mm, which is the inner circumference of the M program recording area, the objective lens (8) for CD-ROM and the disk surface are at an initial position where the working distance is 2 mm. In this state, the DVD (3) is placed on the tray (4) and loaded (see FIG. 1). When the DVD (3) is transported from the front and supported on the support surface of the turntable (5), the type of the optical information recording disk is detected by the detector as described above. A detection signal indicating that the DVD is received from the detector is input to the control device. In response to a command from the control device, the switching motor (1
4), the pinion (15) is rotated clockwise,
The driving force is transmitted to the rack (13) via the pinion (15), and the slide member (11) moves along the guide bar (12) along with the optical axis of the objective lens (8) for CD-ROM and the DV.
It is slid by the distance from the optical axis of the objective lens (9) for D (see the two-dot chain line in FIG. 3A), and the rotation center of the spindle motor (10) and the optical axis of the objective lens (9) for DVD. Is made to coincide with the radial direction of the disk. In reproducing the information from the DVD (3), the optical pickup (6) is slid so that the information can be read from the inner peripheral edge of the program recording area (24 mm from the center of the disk in the case of SD). Adjustment such that the working distance between the DVD objective lens (9) and the disk surface is 1 to 1.5 mm is appropriately performed by a control device, and then the DVD (3) is turned on the turntable (5). Spindle motor (1)
0) is activated and the DVD (3) is rotated. Then, the optical pickup (6) is slid along the guide rail (7) in the direction shown by the arrow in FIG.
The DVD objective lens (9) and the disk surface are 1 to
The information recorded on the DVD (3) is reproduced by the DVD objective lens (9) while maintaining the working distance of 1.5 mm. After the reproduction operation by the DVD (3) is completed, the optical pickup (6) is controlled to return to the reading start position based on a command from the control device.

In the above embodiment, the diameter 120
a CD-ROM (2) having a distance of 25 mm from the center of the disk to the inner peripheral edge of the program recording area;
The optical information recording / reproducing apparatus for reproducing two types of optical information recording disks of DVD (3) having a length of 20 mm and a distance from the center of the disk to the inner peripheral edge of the program recording area of 23 to 24 mm has been described. The information recording / reproducing device includes an optical information recording disk (SD) having a diameter of 120 mm and a distance from the center of the disk to the inner peripheral edge of the program recording area of 24 mm, and an information recording and reproducing apparatus having a diameter of 120 mm and extending from the center of the disk to the inner peripheral edge of the program recording area. Distance is 23
It is needless to say that an optical information recording / reproducing apparatus or the like for reproducing two types of optical information recording disks, such as an optical information recording disk (HDCD) having a diameter of 0.1 mm, may be used. Although the structure of the device is different in the laser beam used, the optical system, the arrangement position, etc.,
Since a structure similar to the structure described in the first embodiment can be employed, a detailed description thereof will be omitted.

(Embodiment 2) In the optical information recording / reproducing apparatus shown in FIG. 9, a spindle motor (62) is rotated about a fulcrum (63) with respect to an optical pickup (61). is there. The spindle motor (62) is held by a rotating member (64) rotatable about a fulcrum (63) on a base (not shown), and the rotating member (64) The extension (64a) from the fulcrum (63) is provided with an elongated hole (66), and a pin (68) projecting from a telescopic rod (67a) of a solenoid (67) fixed on a base. It is loosely fitted.
The state shown in FIG. 9A is an optical pickup (6
CD- by sliding along guide rail (69) of 1)
The moving direction of the optical axis of the ROM objective lens (70) is in a state of being coincident with the radial direction of the disk supported by the turntable (71). Therefore, by sliding the optical pickup (61) along the guide rail (69), information recorded on the CD-ROM (2) is reproduced by the laser beam from the objective lens (70) for the CD-ROM. You can do it. FIG.
In order to reproduce information from the DVD (3) in the state shown in (a), the solenoid (67) is energized, the telescopic rod (67a) is extended, and the rotating member (64) is supported at the fulcrum (63). , The spindle motor (62) is centered in the clockwise direction so that the axis of the spindle motor (62) is at the distance between the optical axis of the objective lens (70) for CD-ROM and the optical axis of the objective lens (72) for DVD. FIG. 9B is rotated by a corresponding linear distance.
Change to the state shown in. Thereby, the moving direction of the optical axis of the DVD objective lens (72) due to sliding along the guide rail (69) of the optical pickup (61) is the same as the radial direction of the disc supported by the turntable (71). It will be in the same state. In the state shown in FIG. 9B, the optical pickup (61) is slid along the guide rail (69), so that the laser beam from the DVD objective lens (72) causes the DV to move.
The information recorded in D (3) can be reproduced. Conversely, in the state shown in FIG.
To reproduce information from (2), the solenoid (67) is energized, the telescopic rod (67a) is contracted, and the rotating member (64) is rotated counterclockwise about the fulcrum (63). The axis of the spindle motor (62) is CD-ROM
By rotating by a linear distance corresponding to the distance between the optical axis of the objective lens (70) for DVD and the optical axis of the objective lens (72) for DVD, the state shown in FIG. Good.

(Embodiment 3) In the optical information recording / reproducing apparatus shown in FIG. 10, an optical pickup (82) is moved with respect to a spindle motor (81). Are slidable along a pair of guide rails (84) installed facing the slide base (83). When the optical pickup (82) slides along the guide rail (84), a driving force from a feed motor (85) provided on the slide base (83) is transmitted to the optical pickup (82) by a feed screw (86). This is performed by a screw type sliding mechanism. A long hole (87) is formed in the slide base (83) in a direction perpendicular to the axis of the guide rail (84), and a pin (88) projecting from the base is inserted into the long hole (87). The slide base (83) can be moved in a direction perpendicular to the axis of the guide rail (84). The slide base (83) is provided with an overhang (83a), and the extension (83a) is connected to a telescopic rod (90a) of a solenoid (90) fixed to the base (89). By operating the solenoid (90), the slide base (83) is moved to the guide rail (84).
Can be moved in a direction perpendicular to the axis. In the state shown in FIG. 10A, the direction of movement of the optical axis of the objective lens (91) for CD-ROM due to sliding along the guide rail (84) of the optical pickup (82) corresponds to the turntable ( 92) is in a state in which it coincides with the radial direction of the disk supported by 92). Therefore, the optical pickup (82) is slid along the guide rail (84) to reproduce information recorded on the CD-ROM (2) by the laser beam from the objective lens (91) for the CD-ROM. Is available. FIG.
To reproduce information from the DVD (3) in the state shown in (a), the solenoid (90) is energized, the telescopic rod (90a) is extended, and the slide base (83) is connected to the guide rail (84). The pin (88) is moved in the direction indicated by the arrow perpendicular to the axis of the hole until the pin (88) comes into contact with the other end of the long hole (87), and the state is changed to the state shown in FIG. The moving distance corresponds to a linear distance between the optical axis of the objective lens (91) for CD-ROM and the optical axis of the objective lens (93) for DVD. Thereby, the guide rail (84) of the optical pickup (82) is provided.
The moving direction of the optical axis of the DVD objective lens (93) due to the sliding along the axis coincides with the radial direction of the disk supported by the turntable (92). FIG.
In the state shown in (b), the optical pickup (8
By sliding 2) along the guide rail (84), information recorded on the DVD (3) can be reproduced by the laser beam from the DVD objective lens (93). Conversely, in the state shown in FIG. 10B, to reproduce information from the CD-ROM (2), the solenoid (90) is energized, the telescopic rod (90a) is contracted, and the slide base (83) is turned on. ) Guide rail (84)
10 is moved by a linear distance corresponding to the distance between the optical axis of the objective lens (91) for CD-ROM and the optical axis of the objective lens (93) for DVD in the direction orthogonal to the axis of FIG.
What is necessary is just to change into the state as shown in (a).

In the above embodiment, the objective lens (91) for the CD-ROM and the objective lens (93) for the DVD are used.
Are simultaneously operated by a common two-dimensional actuator. However, the present invention is not limited to this, and the objective lens (91) for CD-ROM and the objective lens (93) for DVD are each an individual lens. It may be one that is separately activated by a dimensional actuator. In addition, the arrangement of the objective lens (91) for CD-ROM and the objective lens (93) for DVD on the optical pickup is not limited to the structure in the above embodiment, but is oblique to the axis of the guide rail. Alternatively, the objective lens may be one provided with an optical pickup. In short, relatively rotate the spindle motor or the optical pickup with the optical axis of the objective lens for CD-ROM and the optical axis of the DVD objective lens in the direction orthogonal to the sliding direction along the guide rail of the optical pickup. When the CD-ROM is supported by the turntable by moving by a distance corresponding to the component of the connecting line segment in the orthogonal direction, the optical pickup slides along the guide rails for the CD-ROM. The direction in which the optical axis of the objective lens moves and the radial direction of the disc coincide with each other, and the laser beam from the laser light source for CD-ROM is focused on the CD-ROM via the objective lens for CD-ROM. When the DVD is supported on the turntable, the optical pickup slides along the guide rails, and The optical axis of the objective lens is matched with the radial direction and the disk to move the, C
The laser beam from the laser light source for D-ROM is converted to CD-
ROM-CD through an objective lens for CD-ROM
Any structure that converges light on M may be used. This is true not only for the two combinations of the objective lens for the CD-ROM and the objective lens for the DVD, but also for the combination of two or more objective lenses for the other disks. Not even.

[0018]

Since the present invention is configured as described above in detail, it has the following effects. (A) A plurality of objective lenses designed according to a plurality of types of optical information recording disks, and a plurality of laser light sources respectively corresponding to the plurality of objective lenses, are arranged such that the optical axes of the plurality of objective lenses are parallel. And a structure in which the optical axes of the plurality of objective lenses are arranged on the optical pickup such that the optical axes of the laser beams emitted from the laser light sources corresponding to the respective objective lenses and passing through the respective objective lenses coincide with each other. By employing this, it is possible to manufacture a so-called compatible optical information recording / reproducing apparatus capable of recording / reproducing information on / from an optical information recording disc of a plurality of standards by one unit. (B) The optical information recording or reproducing apparatus comprises an optical pickup, a sliding guide mechanism for sliding the optical pickup, and a single unit for rotating the optical information recording disk by supporting it on a support surface of a turntable. One rotation drive means, and a distance corresponding to a component of a line connecting the optical axes of a plurality of objective lenses in the direction orthogonal to the sliding direction of the optical pickup by the sliding guide mechanism, the distance corresponding to the component in the orthogonal direction. A switching mechanism for changing the relative positional relationship between the rotation drive means and the optical pickup; and a direction in which the optical axis of the objective lens moves due to sliding of the optical pickup by the slide guide mechanism, and a support surface for the turntable. The objective lens is selectively switched by the switching mechanism so that the radial direction of the optical information recording disc coincides with the objective lens. In addition, since a rotary drive unit for rotating an optical information recording disk, a precise and expensive optical pickup, and a sliding guide mechanism of the optical pickup can be shared at least, it is space-saving and easy to use. An optical information recording or reproducing apparatus corresponding to the above can be obtained. Then, the components to be used such as the driving means are shared and the devices are integrated, so that the manufacturing cost of the optical information recording or reproducing device can be reduced.
In other words, disposing the objective lenses of the number corresponding to the type of the optical information recording disc on the optical pickup is
Rotation drive means for rotating an optical information recording disc,
Since only one optical pickup and one sliding guide mechanism for the optical pickup are required, the structure itself can be simplified, the space occupied by these components in the device can be reduced, and other components can be arranged in the spare space. In addition to the advantages that the apparatus can be installed and the space in the apparatus can be effectively used, the entire apparatus can be made compact, and the number of parts can be reduced, which is economical.
(C) Since the type of the optical information recording disk is detected by the detecting means for detecting the type of the plurality of different types of optical information recording disks, the optical information recording disk mounted on the apparatus is detected. The type of disc can be determined, and an operation such as selection of an objective lens suitable for the disc type can be automatically performed.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of an optical information recording / reproducing apparatus of the present invention.

FIG. 2 is a perspective view of a main part of an embodiment of the optical information recording / reproducing apparatus of the present invention.

3A and 3B are plan views showing main parts of the optical information recording / reproducing apparatus of FIG. 2, wherein FIG. 3A shows a state where a CD-ROM is supported, and FIG. 3B shows a state where a DVD is supported.

FIG. 4 is an explanatory diagram showing an optical system in the optical information recording / reproducing apparatus of FIG. 2 and showing a time of reproducing a CD-ROM.

FIG. 5 is an explanatory diagram showing an optical system in the optical information recording / reproducing apparatus of FIG. 2 when reproducing a DVD.

6A and 6B are optical systems in an optical information recording / reproducing apparatus using two objective lenses integrally molded with plastic, and FIG. 6A is an explanatory diagram showing a time of reproducing a CD-ROM;
FIG. 4B is an explanatory diagram showing the state during DVD playback.

7A and 7B are plan views of two objective lenses integrally molded with plastic, and FIG. 7A shows the objective lenses in FIG.
(B) shows a compound lens.

FIG. 8 is an explanatory diagram showing an example of a detection principle for detecting the type of an optical information recording disk having a different distance from the disk surface to the information recording surface.

9A and 9B are plan views showing a main part of another embodiment of the optical information recording / reproducing apparatus of the present invention, wherein FIG. 9A shows a state where a CD-ROM is supported, and FIG. 9B shows a state where a DVD is supported. It shows the state that it was turned on.

FIG. 10 is a plan view showing a main part of still another embodiment of the optical information recording / reproducing apparatus of the present invention, wherein (a) is a CD-RO.
M shows a state where the DVD is supported, and (b) shows a state where the DVD is supported.

FIG. 11 is an explanatory diagram of a recording / reproducing method for an optical information recording disk.

FIG. 12 is an explanatory diagram showing the relationship between the spot intensity of light and the inclination of a disk when a CD-ROM is irradiated with a light beam.

FIG. 13 is an explanatory diagram showing the relationship between the spot intensity of light due to the tilt of the disc when irradiating the DVD with a light beam.

FIG. 14 is a plan view of a CD-ROM.

FIG. 15 is a plan view of a DVD.

FIG. 16 is an explanatory diagram showing an optical system in a conventional optical information recording / reproducing apparatus.

17A and 17B are explanatory diagrams of a three-beam method when reproducing information from an optical information recording disk, and FIG. 17A shows a relationship between a laser spot and a pit when a main beam is moved in a radial direction of the disk. (B) shows the principle of reproducing information and detecting a tracking error signal in the three-beam method.

18 is an explanatory diagram showing a relationship between a laser spot and a pit when the main beam moves along a parallel line shifted from the radial direction of the disk in the three-beam method of FIG.

[Explanation of symbols]

 Reference Signs List 1 optical information recording / reproducing device 2 CD-ROM 3 DVD 5, 71, 92 turntable 6, 61, 82 optical pickup 8, 70, 91 CD-ROM objective lens 9, 72, 93 DVD objective lens 10, 62 , 81 spindle motor

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shuichi Ichiura 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-6-168472 (JP, A) (58) ) Surveyed field (Int.Cl. ⁶ , DB name) G11B 7/135 G11B 7/085 G11B 7/09

Claims (20)

(57) [Claims] 1. An optical system comprising: a plurality of objective lenses designed in accordance with a plurality of types of optical information recording disks; and a plurality of laser light sources respectively corresponding to the plurality of objective lenses. optics are parallel and formed by arranged so that the optical axis of the plurality of objective lenses, emitted from the laser light sources corresponding to each of the objective lens and the optical axis of the laser beam passing through the objective lenses are matched A pickup , a sliding guide mechanism for sliding the optical pickup, and an optical information recording disk supported on a support surface of the turntable.
A single rotation driving means for holding and rotating, and a sliding direction of the optical pickup by the sliding guide mechanism.
A line segment that connects the optical axes of multiple objective lenses in the orthogonal direction.
The rotating drive has a distance corresponding to the component in the orthogonal direction.
Change the relative positional relationship between the moving means and the optical pickup
A switching mechanism, and an optical pickup by the sliding guide mechanism.
The direction in which the optical axis of the objective lens moves due to
Of the optical information recording disc supported on the support surface of the cable
The switching mechanism allows the objective lens to be aligned with the radial direction.
An optical information recording / reproducing apparatus characterized in that the optical information recording / reproducing apparatus is configured to be capable of selectively switching the optical information. 2. A switching mechanism for supporting a rotation driving means,
Orthogonal to the sliding direction of the pickup by the sliding guide mechanism
It consists of a support substrate that can be translated in the direction of movement
The optical information recording or reproducing apparatus according to claim 1, wherein 3. The switching mechanism supports a rotary drive means and has a pivot shaft.
To rotate freely in the plane perpendicular to the optical axis of the objective lens
2. The method according to claim 1, wherein the supporting substrate is supported.
An optical information recording or reproducing apparatus according to claim 1. 4. The switching mechanism according to claim 1, wherein the switching mechanism is a sliding scheme of the optical pickup.
Having an internal mechanism and the sliding guide mechanism of the optical pickup.
A support substrate that can be translated in a direction perpendicular to the sliding direction
The optical information recording or reproducing apparatus according to claim 1, wherein the optical information recording or reproducing apparatus comprises: 5. The method according to claim 1, wherein the plurality of objective lenses are provided in a common actuator.
Control in the focus direction and track direction by the data
Claims 1 , 2, 3 or
5. The optical information recording or reproducing apparatus according to item 4 . 6. The optical information recording or reproducing method according to claim 5, wherein
In a raw device, multiple objective lenses are not integrally molded.
An optical information recording / reproducing apparatus characterized in that: 7. A plurality of objective lenses, each of which is independent.
Focus direction and track by separate actuators
It is characterized by being controlled in the direction
The optical information recording or reproducing apparatus according to 1, 2, 3, or 4 . 8. A method in which a plurality of objective lenses have different numerical apertures.
The optical information recording or reproducing apparatus according to claim 5, 6 or 7, wherein: 9. The optical information recording or reproducing method according to claim 8, wherein
In the raw device, there are two types of objective lenses.
Optical information recording or reproducing apparatus. 10. The optical information recording or optical recording method according to claim 9,
In the reproducing device, the objective lens is a first optical information storage device.
A first objective lens having a numerical aperture of 0.45 for a recording disc;
Opened from the objective lens for the first optical information recording disk
An optical information recording or reproducing apparatus , characterized by being a second objective lens having a large number . 11. The optical information recording apparatus according to claim 9, wherein
In the reproducing device, the objective lens is a first optical information storage device.
A first objective lens having a numerical aperture of 0.52 for a recording disc;
The second optical information recording disk has a numerical aperture of 0.60.
2. An optical information recording or reproducing apparatus, comprising: 12. The method according to claim 11, wherein the plurality of objective lenses are on a disk surface.
Optical information recording discs with different distances from the
6. An objective lens for a disc,
8. The optical information recording or reproducing apparatus according to 6 or 7 . 13. The optical information recording and / or reproducing apparatus according to claim 12,
Indicates that the playback device has two types of objective lenses.
Optical information recording or reproducing apparatus according to symptoms. 14. The optical information recording or reproducing method according to claim 13,
In the raw device, the objective lens is a first optical information recording device.
A first objective lens for a disc and a first optical information storage
Distance from disc surface to information recording surface from recording disc
For long or short second optical information recording disc
An optical information recording or reproducing apparatus, which is a second objective lens . 15. An optical information recording apparatus according to claim 13,
Indicates that the first objective lens is a disc display in the reproducing apparatus.
The distance from the surface to the information recording surface is 0.6 mm
First optical information storage with higher recording density than Pact disk
The objective lens irradiates the recording disk with a laser beam.
And the second objective lens is moved from the disk surface to the information recording surface.
The current compact disc with a distance of 1.2mm to
On the second optical information recording disc with high recording density.
An optical information recording or reproducing apparatus, which is an objective lens for irradiating the beam . 16. The optical information recording and / or reproducing apparatus according to claim 13,
Indicates that the first objective lens is a disc display in the reproducing apparatus.
First optics with a distance from the surface to the information recording surface of 1.2 mm
Objective laser that irradiates a laser beam onto a disc
And the second objective lens transmits information from the disc surface.
The distance to the recording surface is 0.6 mm
Second optical information recording disc having higher recording density than disc
It is an objective lens that irradiates a laser beam to the
Optical information recording or reproducing apparatus according to. 17. The optical information recording apparatus according to claim 17, wherein
Disc diameter and diameter of the second optical information recording disc
Turn the optical information recording disc with the same diameter
That the cable is supported on the support surface of the cable.
Claims 8, 9, 10, 11, 12, 13, 1
17. The optical information recording or reproducing apparatus according to 4, 15 or 16 . 18. The optical information recording and / or reproducing apparatus according to claim 17,
Is a reproducing apparatus, wherein the rotation driving means is the first optical information
The diameter of the recording disk and the diameter of the second optical information recording disk
An optical information recording disc with a diameter of 120 mm
The table should be supported on the support surface of the
An optical information recording or reproducing apparatus characterized by the following . 19. A plurality of optical information recording disks of different types.
Information recording disc by the detecting means for detecting the type of
The feature is that the type of
1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17 or 18
An optical information recording or reproducing apparatus according to claim 1. 20. For detecting the type of optical information recording disk
Is a light emitting element and an optical information recording disc.
Detects differences in the distance from the disc surface to the information recording surface
Light-receiving elements according to the type of optical information recording disc
A non-contact optical detector comprising:
20. The optical information recording or reproducing apparatus according to claim 19, wherein