JPH09282671A - Recording and/or reproducing device of desk like optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small, inexpensive and highly reliable recording and/or reproducing device capable of recording and/or reproducing information signal in the plural kinds of disk like optical recording media having different kinds of constitution of recording layers such as CD, CD-R or DVD. SOLUTION: This device is provided with a driving/supporting mechanism 13 for supporting plural kinds of mounted disk like optical recording media, having different kinds of constitution of recording layers and rotary driving them, and plural pickup devices 3, 4, supported by mutually independent guide mechanisms 15, 30, moving the disk like optical recording media in the radial direction on the different position, respectively, and having laser beam souces outputting laser beams having different wavelengths. The pickup devices 3, 4 are arranged by mutually imparting an angular difference from a symmetric position on which the respective guide mechanisms 15, 30 interpose the driving/ supporting mechanism 13. The laser beams are two kinds whose wavelengths are <=680nm and 770nm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to record information signals and the like on a plurality of types of disc-shaped optical recording media having different recording layer configurations and reproduce the recorded information signals and the like. The present invention relates to a recording and / or reproducing apparatus for a disc-shaped optical recording medium that can be performed.

[0002]

2. Description of the Related Art As a disc-shaped optical recording medium, a compact disc (hereinafter referred to as a CD), which is a read-only optical disc having a diameter of 120 mm, is provided. This C
D is a disk substrate formed of a transparent synthetic resin material such as a polycarbonate resin, a polyvinyl chloride resin, or an acrylic resin having a high light transmittance and a mechanical resistance or a chemical resistance. On the disc substrate, pits arranged concentrically are transferred and formed on one main surface by a stamper incorporated in a molding die. These pits are
Recording tracks are formed on the disk substrate as coded small holes having different circumferential lengths corresponding to predetermined information signals or the like. The CD is formed by vapor-depositing aluminum or the like having a high light reflectance on the pit forming surface of the disk substrate to form a reflective layer, and further covering the entire reflective layer with a protective layer.

In a CD, an information signal recorded as pits on a recording track of a disc substrate is reproduced by an optical pickup device. The optical pickup device collects and irradiates a semiconductor laser, which is an emission light source for reproducing laser light having a wavelength of 780 ± 10 nm, and the emitted laser light on a recording surface of the disk substrate, and inputs reflected light from the disk substrate. Optical components such as an objective lens having an NA of 0.45 ± 0.01, a half mirror for splitting incident light and reflected light, a spectroscope such as a beam splitter, and a photodetector such as a photodetector for detecting reflected light Alternatively, it is composed of an arcuator mechanism or the like that drives the objective lens in the focusing direction and the tracking direction.

In the optical pickup device, the objective lens is driven by an arcuator mechanism which is driven based on the tracking error signal and the focus error signal detected by the photodetector, and the laser light emitted from the semiconductor laser is rotationally driven. Tracking control and focusing control are performed so as to follow a predetermined recording track of a CD to be recorded. Further, in the optical pickup device, the reflected laser light reflected by the recording surface of the CD is received by the objective lens, dispersed by the spectroscope, and then detected by the photodetector. The optical pickup device sends a reproduction output corresponding to the intensity of the reflected light based on the pit state of the recording track to the reproduction controller by the photodetector to reproduce the information signal or the like.

As a disc-shaped optical recording medium which uses laser light having a wavelength of 780 ± 10 nm as a reproduction light, not only the above-mentioned reproduction-only CD but also a compact disc recordable (which enables recording of information signals, etc.) Below, CD-
Called R. ), A compact disc read only memory (hereinafter referred to as a CD-ROM), and the like. In particular, the CD-R is constructed by forming grooves in advance on a transparent disc substrate together with pits and further forming an organic dye layer between the disc substrate and the reflective layer. This CD-R is a reproduction laser beam having a wavelength of 770 nm or more with which the groove is irradiated, for example, 7
The organic dye and the polycarbonate resin forming the transparent layer react with each other by the heat of the laser light of 80 nm to form pits according to the information signal or the like.

The above-mentioned CD is capable of recording digital moving image information for 74 minutes using MPEG-1.
In addition, digital that enables high-density recording of information signals, etc.
Video discs (DVDs) have been proposed. This D
The VD has a total thickness of 1.2 mm by bonding two disk substrates having a thickness of 0.6 mm, and has a wavelength of 680 nm or less as reproduction light, for example, 65.
A laser beam of 0 nm or 635 nm is used, and an information signal or the like is reproduced by a pickup device in which the numerical aperture (NA) of the objective lens is increased to 0.6. In DVDs, the pitch of recording tracks is reduced. Therefore, although this DVD has an overall thickness dimension of 1.2 mm as compared with a CD, MPEG-2 is used as a video data compression technique to achieve high density recording of information signals and the like. By, for example, 2
It is possible to reproduce high-quality digital moving image information over time.

[0007] It is desired that the DVD reproducing apparatus has a function capable of reproducing a CD. As described above, the DVD reproducing device has a D in which an information signal is recorded at a position of 0.6 mm from the main surface of the disc substrate.
A laser beam is focused on the VD to reproduce an information signal or the like. Therefore, in a CD-DVD compatible reproducing apparatus capable of reproducing information signals and the like from a CD and a DVD, laser light must be focused on recording layers at two positions 0.6 mm and 1.2 mm from the main surface. Just 680mm
An information signal or the like cannot be reproduced by a CD reproducing device in which a laser light source that outputs the following laser light and an objective lens having an NA of 0.6 are replaced.

Therefore, as a CD-DVD compatible reproducing apparatus, for example, a pair of objective lenses having different focal lengths,
A so-called shaft-sliding optical pickup device has been proposed, which has a switching mechanism for switching and driving these objective lenses corresponding to CD and DVD. Further, as another CD-DVD compatible reproducing apparatus, a hologram is formed on the surface of an objective lens, and a part of the laser light passing therethrough is diffracted to make the focal position different between the diffracted laser light and the non-diffracted laser light. A so-called bifocal optical head type optical pickup device has been proposed. Other CD-
As a DVD compatible reproducing apparatus, a so-called liquid crystal type optical pickup in which a black and white liquid crystal panel having a diaphragm action is arranged in the laser optical path, and the beam spot is adjusted by the black and white liquid crystal panel in correspondence with a CD and a DVD. A device has been proposed.

Of course, in order to maintain compatibility with the conventional reproducing apparatus, these CD-DVD compatible reproducing apparatuses have at least a width dimension of 146 mm and a depth dimension of 203.
It must be constructed within 2 mm.

[0010]

By the way, since the above-mentioned shaft sliding type optical pickup device is provided with the two objective lenses and the switching mechanism therefor, the weight of the movable part becomes large, and focusing control and tracking control are performed. There is a problem that the responsiveness becomes poor. Therefore, this CD-DVD
The compatible playback device, for example, when used as an accessory device or a terminal device of a computer device that requires high-speed transfer of a data signal, deteriorates data processing characteristics, and thus has a problem that its applicable field is limited. . further,
Since this axial-sliding optical pickup device has an integral structure including two objective lenses, there is a problem in that the individual defective rate of these objective lenses becomes the defective rate of the entire product, resulting in low reliability. .

The bifocal optical head type optical pickup device has a feature that it can be downsized as compared with the shaft sliding type optical pickup device, but it is a molding for molding a special objective lens. There is a problem that the cost is extremely high because the die requires ultra-precision processing technology and the yield is low.

Further, the liquid crystal type optical pickup device has two
As with the focused optical head type optical pickup device, the problem of size increase is small, but since a part of the laser light is masked, the light efficiency is deteriorated. Therefore, the liquid crystal type optical pickup device has a problem that a high output laser light source is required.

On the other hand, each of these CD-DVD compatible reproducing apparatuses is equipped with one laser light source for outputting a laser beam of 680 nm or less, and has been developed exclusively for compatible reproduction of CD and DVD. As mentioned above,
The CD-R is provided with an organic dye layer having wavelength dependency, and when a laser beam of 680 nm or less is used as a reproduction light, an information signal or the like cannot be reproduced accurately. That is, the CD-R has a phenomenon that the light absorption rate in the organic dye layer is increased with respect to the irradiated laser light having a wavelength of 680 nm or less, the reflectance is decreased, and the modulation degree of the laser light by the pit is also decreased. Present. Therefore, in the various CD-DVD compatible reproducing apparatuses described above, there is a problem that there is no compatibility for the CD-R.

Therefore, according to the present invention, the compatibility of recording and / or reproducing operations of information signals and the like with respect to a plurality of types of disc-shaped optical recording media having different recording layer configurations such as CD, CD-R or DVD. The present invention has been proposed for the purpose of providing a recording and / or reproducing apparatus for a disc-shaped optical recording medium which is securely held, has high reliability, is small in size, and is inexpensive.

[0015]

DISCLOSURE OF THE INVENTION A recording and / or reproducing apparatus for a disc-shaped optical recording medium according to the present invention, which achieves this object, comprises a plurality of disc-shaped optical recordings having different configurations of loaded recording layers. A drive support mechanism that supports and rotates the medium, and a disc-shaped optical recording medium that is supported by a guide mechanism and is rotationally driven by the drive support mechanism are moved in the radial direction and have different wavelengths. It has at least a first pickup device and a second pickup device for recording and / or reproducing information signals and the like from a predetermined disc-shaped optical recording medium by using a laser light source for outputting a laser beam. The recording and / or reproducing apparatus is configured by arranging the first pickup device and the second pickup device with respective guide mechanisms at an angle difference from a target position sandwiching the drive support mechanism. It

The recording and / or reproducing apparatus for the disk-shaped optical recording medium has a wavelength of 680 for the first pickup apparatus.
The second pickup device includes a laser light source that outputs a laser light having a wavelength of 770 nm or more.

According to the recording and / or reproducing apparatus for the disc-shaped optical recording medium of the present invention configured as described above, even a plurality of types of disc-shaped optical recording medium having different recording layer configurations can be used. The recording and reproduction of the information signal and the like are surely performed by the first pickup device or the second pickup device having a simple structure that conforms to the specifications of the recording layer. The first pickup device and the second pickup device are
Since the disk-shaped optical recording media which are not interfered with each other are arranged at symmetrical positions with respect to each other and the guide mechanisms are arranged with an angular difference therebetween, the apparatus can be downsized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. A recording and / or reproducing apparatus (hereinafter simply referred to as a reproducing apparatus) for a disc-shaped optical recording medium shown in the drawings as an embodiment of the present invention.
1 is a DVD or CD, CD-R, or
A plurality of types of disc-shaped optical recording media 2 such as CD-ROM (hereinafter,
It is simply referred to as the disk 2. ) Is a CD-DVD compatible reproducing apparatus capable of reproducing information signals and the like, and is attached to a digital video apparatus, a computer apparatus or the like.

As shown in FIGS. 1 and 2, the reproducing device 1 includes a first pickup device 3 for reproducing information signals recorded on a DVD (hereinafter referred to as a first disc 2A), a CD, or a CD. CD-R, CD-ROM (hereinafter referred to as the second
Disc 2B. ) And a second pickup device 4 for reproducing the information signal recorded in (1). The reproducing apparatus 1 detects whether the loaded disc 2 is the first disc 2A or the second disc 2B by a specification detector (not shown), and outputs the first pickup device based on the output of the specification detector. One of the third pickup device 4 and the second pickup device 4 is driven to reliably reproduce the recorded information signal and the like from the loaded disc 2.

The reproducing apparatus 1 is provided with a rectangular box type casing 5 which is long in the front-rear direction and whose front portion (the lower side in FIG. 1) is opened, and guide rails which are respectively arranged on the inner side faces in the front-rear direction. A disk tray 7, which is supported on both sides by 6, and which is inserted into and removed from the front opening by a drive mechanism (not shown) is housed. In this disc tray 7,
As shown in FIGS. 3 and 5, a ring-shaped disc loading recess 8 is provided on the main surface thereof, and the disc 2 is inserted into the disc loading recess 8 when ejected to project from the front face of the housing 5. Is loaded. Further, in order to accommodate a small-diameter optical disc in the disc tray 7,
Second disk loading recess 9 concentric with disk loading recess 8
Is provided.

Further, the disc tray 7 has a first guide notch portion 12A, which constitutes a moving space portion of a first pickup device 3 described later, on its main surface, and a second guide notch portion 12A described later.
And a second guide cutout portion 12B which constitutes a moving space portion of the pickup device 4. The first guide notch portion 12A is formed as a notch groove in the front-rear direction in the upper region of the disc tray 7, and a second guide notch portion 12B formed as an inclined notch groove is continuous from the front portion thereof. Is provided. As shown in FIG. 5, the first guide notch portion 12A and the second guide notch portion 12B are provided with an opening angle of about 135 °, and have symmetrical positions with the disc table 13 sandwiched therebetween. It is provided in. In other words, the disc table 13 is positioned at the bending communication portion 12C between the first guide notch portion 12A and the second guide notch portion 12B in the state where the disc tray 7 is housed in the housing 5. .

As shown in FIG. 2, the chassis 5 is provided with a sub-chassis 10 which is located in the space between the bottom surface of the housing 5 and the disc tray 7 and which has a mechanical portion which will be described later. As shown in FIGS. 1 and 4, the sub-chassis 10 has a first guide cutout 12A and a second guide cutout 12 when the disc tray 7 is housed in the housing 5.
As the bottom portion of B is formed, the front portion is bent to the left side with an angle difference of about 135 ° from the position of about ⅓ in the front-rear direction, and has a substantially inverted U-shape.

In the sub-chassis 10, a first pickup device 3 is provided in a rear side region (first region) 10A in the front-rear direction corresponding to the first guide notch 12A of the disc tray 7, as will be described later. And the second pickup device 4 is disposed in the front side region (second region) 10B corresponding to the second guide cutout portion 12B of the disc tray 7. Further, the sub-chassis 10 is integrally formed with a mounting portion 11 having round holes or U-shaped holes at appropriate positions on the outer peripheral portion thereof.
Although detailed description is omitted, the vibration damping property is achieved by being attached to the bottom surface portion of the housing 5 via a damper member such as a rubber bush.

The sub-chassis 10 has a first area 10A and a second area 10B connected to each other at a position approximately 1/3 from the front side in the front-rear direction, and this connection portion serves as a disk table mounting portion 10C. Composed. The disc table arranging portion 10C is located at a position corresponding to the refraction communicating portion 12C of the disc tray 7 housed in the housing 5, and the disc table 13 constituting a disc drive supporting mechanism is arranged. The disk table 13 is fixed to the output shaft 14A of the spindle motor 14, and fits in the center hole of the disk 2 in a state where the disk tray 7 loaded with the disk 2 is housed inside the housing 5. When the spindle motor 14 is driven by the reproducing operation, the disc table 13 rotationally drives the disc 2 at a constant linear velocity.

The sub-chassis 10 is provided with a first pickup device 3 which is movable along a rear side first region 10A divided in the front-rear direction by a disc table 13 and is inclined to the lower left. 2nd on the front side
The second pickup devices 4 that are movable along the area 10B are provided. As described above, the first pickup device 3 reproduces the information signal and the like recorded on the first disc 2A. The second pickup device 4 reproduces the information signal recorded on the second disk 2B.

The first pickup device 3 uses a guide mechanism 15 composed of a pair of front and rear guide shafts 15A and 15B, which are arranged in parallel to each other in the first area 10A so as to face the first disk 2A. It is movably supported in the radial direction. The first pickup device 3 is
The basic configuration is equivalent to that of the conventional DVD reproducing pickup device described above, and the semiconductor laser 19 that outputs laser light of 650 nm or 635 nm wavelength and the skew sensor 21 are mounted.

That is, this first pickup device 3
Includes a base 16 supported by guide shafts 15A and 15B forming a guide mechanism 15 via a pair of bearings 39A and 39B that are integrally provided on both sides so as to be spaced apart from each other in the front-rear direction. A pickup body 17 is supported on the base 16 via a holding member 40, which will be described in detail later. An engaging member 44 having a U-shaped cross section is fixed to the base 16, and the other end of the engaging member 44 is relatively engaged with an engaging groove 15a formed in the first guide shaft 15A. There is.

The pick-up main body portion 17 is, for example, an arc actuator mechanism, an objective lens 18 having an NA of 0.6 which is controlled and driven by the arc actuator mechanism in the focusing direction and the tracking direction, and 650 nm.
A semiconductor laser 19 that outputs laser light of wavelength (or 635 nm), optical components such as a half mirror, a beam splitter or a collimator lens (not shown), and members and mechanisms such as a photodetector 20 including a photodetector are mounted. . The pick-up body portion 17 has the bearing portion 3
The guide shafts 15A and 15B pass through the shafts 9A and 39B to move in the axial direction.

As shown in FIG. 7, the holding member 40 has an overall frame body, and one end portion thereof has the bearing portion 39A of the base 16 described above.
The bearing portion 41, through which the guide shaft 15A penetrates, is integrally formed by being positioned between. The holding member 40 has a connecting piece 42 on its inner surface orthogonal to the guide shaft 15A.
Are supported via a rotating shaft 43. The pick-up main body 17 is vertically rotatably assembled to the holding member 40 via the connecting piece 42 with the turning shaft 43 as a fulcrum. Therefore, the first pickup device 3
As described above, the entire body is movable in the front-rear direction along the guide mechanism 15, and the pickup body 17 is rotatably supported with respect to the holding member 40 with the rotation shaft 43 as a fulcrum. There is. The pickup body 17 is prevented from rattling by being pressed against the inner surface of the holding member 40 by the elastic force of the coil spring mounted on the rotating shaft 43.

A skew sensor 21 is mounted on the base 16 of the first pickup device 3. The skew sensor 21 includes a light emitting element that emits skew detection light to the first disk 2A that is detected to be loaded and is rotationally driven by the disk table 13, and a skew reflected from the surface of the first disk 2A. The light emitting element receives the detection light. First pickup device 3
6, the output of the skew sensor 21 is sent to the differential amplifier circuit 47 for differential amplification, and a skew error signal whose signal level changes according to the skew of the skew detection light is generated. . Further, in the first pickup device 3, the skew adjusting drive mechanism 26 described later is driven by the servo circuit 48 so that the skew error signal becomes 0 level, and the first pickup device 3 responds to the inclination of the first disk 2A as described later. Skew adjustment is performed.

The first pickup device 3 reproduces an information signal or the like recorded by seek-scanning a desired recording track of the first disc 2A by the first pickup driving mechanism 22 provided in the subchassis 10. To do. The first pickup drive mechanism 22 includes a feed motor 23, a gear mechanism 24 that transmits the rotation of the feed motor 23, a rack mechanism 25 integrated on the base 16 side, and the like. When the feed motor 23 is driven by a reproduction operation or the like, the first pickup drive mechanism 22 outputs the rotation output of the feed motor 23.
4 to the rack mechanism 25. The gear mechanism 24 is provided with a backlash prevention mechanism having a two-gear structure whose details are omitted, and accurately transmits the rotation output of the feed motor 23 to the rack mechanism 25. As a result, the first pickup device 3 has the guide shafts 15A, 1
It is supported by 5B and reciprocates along the first region 10A.

As shown in FIG. 4, one end of the first guide shaft 15A is supported by the skew adjusting drive mechanism 26, and the other end thereof is erected and supported by the sub-chassis 10.
Is supported by a bearing 27. Also, the first guide shaft 1
As shown in FIG. 6, the engagement groove 15a in the axial direction is provided in 5A, and the other end portion of the engagement member 44 whose one end is fixed to the holding member 40 is relatively engaged as described above. ing. The first bearing 27 also serves as a bearing that supports one end of the drive shaft 30A that constitutes the guide mechanism 30 of the second pickup device 4, as will be described later.

As shown in FIG. 4, one end of the second guide shaft 15B is supported by a bearing piece 28 formed by cutting and raising a part of the sub-chassis 10 and the other end thereof is supported by the sub-chassis 10. It is supported by a second bearing 29 which is vertically supported. This second bearing 29 has a second
Also serves as a bearing that supports one end of a guide shaft 30B that constitutes the guide mechanism 30 of the pickup device 4.

The skew adjusting drive mechanism 26 includes a skew adjusting gear 45 fixed to one end of the first guide shaft 15A.
And the DC motor 4 that drives this skew adjustment gear 45
It is composed of members such as 6. The DC motor 46 drives the skew adjustment gear 45 by being driven by the output of the skew sensor 21 as described later. The first guide shaft 15A is used for the skew adjusting gear 4
By the rotation of 5, rotation is performed in the left-right direction as shown by the arrow in FIG.

In the first pickup device 3, as described above, the skew error signal generated by the differential amplifier circuit 47 when the skew of the reproduction laser light based on the skew detection light is detected by the skew sensor 21 is sent to the servo circuit 48. Then, the skew adjustment drive mechanism 26 is operated. That is, the skew adjustment drive mechanism 26 is
The DC motor 46 is driven under the control of the servo circuit 48, and the skew adjusting gear 45 is rotated to the left or right to rotate the first guide shaft 15A. The operation of the first guide shaft 15A is transmitted to the base 16, that is, the pickup body 17 via the engaging member 44 that is relatively engaged with the engaging groove 15a.

As a result, the pickup main body 17 swings with respect to the holding member 40 with the rotary shaft 43 as a fulcrum. Therefore, in the first pickup device 3, the tilt of the objective lens 18 is adjusted with respect to the optical disc 2 held and rotated by the disc table 13, and skew adjustment is performed.

The first pickup device 3 configured as described above is located on the inner peripheral portion of the first disc 2A, and when the reproducing operation is performed and the first disc 2A is rotationally driven, First by the first pickup drive mechanism 22
The seek operation of moving in the radial direction from the inner peripheral portion to the outer peripheral portion of the disk 2A is performed. The first pickup device 3 emits 650n emitted from the semiconductor laser 19.
The laser light of m wavelength passes through the spectroscope and is guided to the objective lens 18.

The laser light having a wavelength of 650 nm is made incident on the first disk 2A by the objective lens 18 and focused on the recording track having the pits formed therein. 650
The laser light having the wavelength of nm has the intensity of the light modulated on the basis of the pit state of the recording track.
The light is reflected by the reflection layer of and is incident on the objective lens 18 again. The reflected laser light is dispersed by the spectroscope from the objective lens 18 and is incident on the photodetector. In the reproducing device 1, a reproduction output corresponding to the pit state is sent from the photodetector to the control unit to reproduce an information signal or the like.

Further, the control section extracts the tracking error signal and the focus error signal from the reproduction output of the photodetector and outputs the tracking control signal or the focusing control signal. In the first pickup device 3, the arcuator mechanism 17 is driven by these tracking control signals or focusing control signals, and 650 nm
The tracking control and the focusing control of the objective lens 18 are performed so that the laser light of the wavelength is made to follow the focused recording track of the first disc 2A. Further, in the first pickup device 3, the skew sensor 21 performs skew adjustment corresponding to the inclination of the first disk 2A and the like.

The second pickup device 4 includes drive shafts 30A arranged along both sides of the second area 10B.
A guide mechanism 30 including a guide shaft 30B and the guide shaft 30B movably supports the disk 2 in the radial direction. More specifically, the second pickup device 4 is different from the first pickup device 3 described above with an angle difference of about 135 ° laterally with the disc drive support mechanism interposed therebetween.
It is set to 0. The second pickup device 4
Is a device equivalent to a conventional CD pickup device that outputs laser light having a wavelength of 770 nm or more, specifically, 780 nm.

The second pickup device 3 is provided with a base 32 that supports the second region 10B on both sides by a drive shaft 30A and a guide shaft 30B that form the guide mechanism 30. The objective lens 3 having an NA of 0.45, which is controlled and driven in the focusing direction and the tracking direction by an arcuator mechanism (not shown).
3 and, although not shown, a semiconductor laser that outputs a laser beam having a wavelength of 770 nm or more, specifically a wavelength of 780 nm, optical components such as a half mirror and a beam splitter, or a photodetector or other member or mechanism is mounted. Has been done.

The second pickup device 4 seeks and scans a desired recording track of the second disk 2B by the second pickup driving mechanism 34 provided in the subchassis 10 to reproduce the recorded information signal and the like. . Although not described in detail, the second pickup drive mechanism 34 is composed of a spindle motor, a gear mechanism that transmits the rotation of the spindle motor to the drive shaft 30A, and the like. When the spindle motor is driven by the reproducing operation, the rotation output of the second pickup drive mechanism 34 is transmitted to the drive shaft 30A via the gear mechanism, and rotationally drives the drive shaft 30A.

A spiral feed dog is formed on the outer periphery of the drive shaft 30A, which is integrally formed on one side surface of the base 32 of the second pickup device 4 and spiral on the inner peripheral wall. Of the inner peripheral tooth is penetrated through the bearing cylindrical portion. The feed teeth of the drive shaft 30A and the inner peripheral teeth of the bearing tubular portion are
Meshed with each other. Therefore, when the drive shaft 30A is rotationally driven by the second pickup drive mechanism 34, the second pickup device 4 is reciprocated along the second region 10B while being supported by the drive shaft 30A and the guide shaft 30B. To do.

As described above, one end of the drive shaft 30A is one guide shaft 15 of the first pickup device 3.
It is rotatably supported by a first bearing 27 that supports one end of A. As shown in FIG. 4, the other end of the drive shaft 30A is rotatably supported by a bearing piece 35 formed by cutting and raising a part of the sub chassis 10. In addition, one end of the guide shaft 30B is supported by the second bearing 29 that supports one end of the other guide shaft 15B of the first pickup device 3, and the other end thereof is one of the sub-chassis 10. It is supported by a bearing piece 36 formed by cutting and raising a portion.

As described above, the first bearing 27 rotatably supports one end of the first guide shaft 15A which guides the first pickup device 3 on one side thereof.
The other end rotatably supports one end of a drive shaft 30A that guides the second pickup device 4. Therefore, the first bearing 27 includes the first guide shaft 15A and the drive shaft 30A.
And are mutually offset by 135 °,
It has a cylindrical shape that is bent in a substantially inverted shape. Similarly, the second bearing 29 rotatably supports one end of the second guide shaft 15B that guides the first pickup device 3 on one side thereof, and supports the second pickup device 4 on the other side thereof. One end of the guide shaft 30B that guides is rotatably supported. Therefore, the second bearing 29 has a tubular shape bent in a substantially inverted V shape by the second guide shaft 15B and the guide shaft 30B being provided with an angle difference of 135 °. .

The second pickup device 4 configured as described above performs the same operation as that of the first pickup device 3 described above, and accurately reproduces the information signal and the like recorded on the second disc 2B. . That is, the second pickup device 4 is located on the inner peripheral portion of the second disc 2B, and when a reproduction operation is performed to rotationally drive the second disc 2B, the second pickup drive mechanism 34 causes the second pickup drive mechanism 34 to rotate. A seek operation is performed to move radially from the inner peripheral portion toward the outer peripheral portion. In the second pickup device 4, the laser light having a wavelength of 780 nm emitted from the semiconductor laser passes through the spectroscope and is guided to the objective lens 33.

The laser light having a wavelength of 780 nm is made incident on the second disk 2B by the objective lens 33 and focused on the recording track having the pits formed therein. 780
The laser light having the wavelength of nm has the intensity of the light modulated on the basis of the pit state of the recording track of the second disk 2B.
The light is reflected by the reflection layer of and is incident on the objective lens 33 again. The reflected laser light is dispersed by the spectroscope from the objective lens 33 and is incident on the photodetector. The photodetector sends a reproduction output according to the pit state to the control unit to reproduce an information signal or the like.

Further, the control section extracts the tracking error signal and the focus error signal from the reproduction output of the photodetector, and outputs the tracking control signal or the focusing control signal. The arc pickup mechanism of the second pickup device 4 is driven by these tracking control signals or focusing control signals so that the laser light of 780 nm wavelength is made to follow the predetermined recording track of the second disk 2B. And the objective lens 33
Tracking control and focusing control are performed.

As described above, in the reproducing apparatus 1, when the first disc 2A or the second disc 2B having a different recording layer configuration is loaded, its type is detected and the first disc conforming to its specifications is detected. The first pickup device 3 or the second pickup device 4 is selected and the reproducing operation is performed. The reproducing apparatus 1 includes a laser light source that outputs a laser light of 650 nm wavelength and a laser light source that outputs a laser light of 780 nm wavelength, so that information recorded from a plurality of types of discs 2 having different recording layer configurations is recorded. Reproduce signals etc. reliably.

In the reproducing device 1, as described above, the guide mechanism 15 of the first pickup device 3 and the guide mechanism 30 of the second pickup device 4 sandwich the disc table 13 for rotationally driving the disc 2 at 135 °. It is arranged with an angle difference. With this configuration, the playback device 1 is downsized by about 20 mm in depth dimension as compared with a case where the first pickup device 3 and the second pickup device 4 are arranged on the center line with the disc table 13 interposed therebetween. Therefore, compatibility with the conventional playback device is maintained.

The angle difference between the first pickup device 3 and the second pickup device 4 is not limited to the above-mentioned 135 °, but may be set to an appropriate angle difference. However, it is not appropriate because the width of the reproducing device becomes large and the first pickup device 3 and the second pickup device 4 abut at the innermost peripheral position. Also,
This angle difference can be made smaller by adopting an appropriate escape structure for the base 16 of the first pickup device 3 and the base 32 of the second pickup device 4.

The reproducing apparatus 1 includes the first pickup apparatus 3
First guide shaft 15A and second guide shaft 15B that form the guide mechanism 15 of the above, and drive shaft 30A and guide shaft 30B that form the guide mechanism 30 of the second pickup device 4.
By supporting and on the same sub-chassis 10, their height positions can be accurately defined as shown in FIG. Therefore, the reproducing apparatus 1 can accurately position the first pickup device 3 and the second pickup device 4 with respect to the disc 2 without requiring a troublesome adjusting operation.

The present invention is not limited to the reproduction-only device 1 which only reproduces the information signal recorded on the disc 2 described above, but various developments can be made as follows. That is, when the reproducing apparatus 1 enables writing of an information signal or the like on the write-once type disc having the magnetic recording layer, the first pickup apparatus 3 or the second pickup apparatus 4 operates with respect to the objective lenses 18 and 33. And a magnetic head for applying an external magnetic field to the second disk 2B with the first disk 2A or the second disk 2B sandwiched therebetween is arranged as a so-called magnetic recording type pickup device.

In the reproducing apparatus 1, the driving mechanism 22 of the first pickup device 3 and the driving mechanism 34 of the second pickup device 4 are different from each other, but they are constituted by the same mechanism. Good. Furthermore, the playback device 1
Adopts a structure in which, for example, the first guide shaft 15A and the drive shaft 30A are integrally connected to each other in the first bearing 27 by a universal joint mechanism or the like. The drive mechanism 34 of the second pickup device 4 may be configured to also serve as its drive source.

In the reproducing apparatus 1, the skew adjusting mechanism is attached to the first pickup apparatus 3, but the skew adjusting mechanism may be attached to the second pickup apparatus 4 if necessary. In addition, the first pickup device 3 holds the pickup body 17 on the holding member 40 in a rotatable manner to perform skew adjustment, and is rotated by the skew adjustment drive mechanism 26.
The guide shaft 15A and the base 16 are connected by the engaging member 44, but for example, the first guide shaft 15
A may be tilted directly.

[0056]

As described in detail above, according to the recording and / or reproducing apparatus for the disc-shaped optical recording medium of the present invention, it is easy to have a laser light source for outputting laser light having different wavelengths. And at least a first configured in a small size
Of the disc-shaped optical recording medium having different recording layer configurations, the information signals of the first pickup device and the second pickup device are provided by the first pickup device and the second pickup device. Etc. can be accurately recorded and / or reproduced. A recording and / or reproducing apparatus for a disc-shaped optical recording medium sandwiches a drive support mechanism for supporting and rotating the disc-shaped optical recording medium in which a guide mechanism for a first pickup device and a second pickup device is mounted. By arranging with an angle difference, the overall size can be reduced, and recording and / or reproducing for recording and / or reproducing an information signal or the like from a specific disc-shaped optical recording medium.
Alternatively, since it is possible to adopt an equivalent part or an equivalent mechanism provided in the reproducing apparatus, and it is possible to replace each pickup apparatus, and the yield rate is improved, the manufacturing cost is low.

[Brief description of drawings]

FIG. 1 shows a CD and a CD-R as an embodiment of the present invention.
FIG. 3 is a perspective plan view of a main part of a reproducing device that enables compatible reproduction of a DVD and a DVD.

FIG. 2 is a perspective side view of a main part of the reproducing apparatus.

FIG. 3 is a cross-sectional view illustrating the configuration of the reproducing device.

FIG. 4 is a main-portion plan view showing a mechanical portion of the reproducing apparatus.

FIG. 5 is a plan view of a disc tray provided in the reproducing apparatus.

FIG. 6 is a configuration diagram of a skew adjusting mechanism which is included in the first pickup device of the reproducing apparatus and which adjusts the skew of the disc.

FIG. 7 is a schematic configuration diagram of a first pickup device included in the reproducing apparatus.

[Explanation of symbols]

1 playback device (CD-DVD compatible recording / playback device), 2
Disc (disc-shaped optical recording medium), 2A 1st disc (DVD), 2B 2nd disc (CD), 3rd
Pickup device (DVD pickup device),
4 second pickup device (CD pickup device), 13 disc table (disc rotation support mechanism), 15 first pickup device guide mechanism, 1
8 Objective Lens, 21 Skew Sensor, 22 First Pickup Drive Mechanism, 26 Skew Adjustment Mechanism, 30
Guide mechanism of second pickup device, 33 Objective lens, 34 Second pickup driving mechanism, 40 Holding member, 44 Engaging member, 45 Skew adjusting gear, 46
DC motor

Claims (4)

[Claims] 1. A recording and / or reproducing apparatus for a disk-shaped optical recording medium, in which a plurality of kinds of disk-shaped optical recording media having different recording layers are loaded to record and / or reproduce information signals and the like, A drive supporting mechanism that supports and rotates the loaded disc-shaped optical recording medium, and the disc-shaped light that is supported by the first guide mechanism and the second guide mechanism and is rotationally driven by the drive supporting mechanism. Recording of information signals from a predetermined disc-shaped optical recording medium is performed by moving the recording medium in different radial positions in the radial direction and having a laser light source that outputs laser light having different wavelengths. And / or at least a first pickup device for reproduction and a second pickup device. The first pickup device and the second pickup device are respectively supported. Recording and / or recording of a disk-shaped optical recording medium, characterized in that the first guide mechanism and the second guide mechanism are arranged with an angular difference from the symmetrical position with the drive support mechanism sandwiched therebetween. Playback device. 2. The first pickup device includes a laser light source that outputs laser light having a wavelength of 680 nm or less, and the second pickup device has a wavelength of 770 nm.
The recording and / or reproducing apparatus for a disk-shaped optical recording medium according to claim 1, further comprising a laser light source that outputs the above laser light. 3. A skew sensor is mounted on the first pickup device, and an inclination of the first guide mechanism is adjustable with respect to a thickness direction of the disc-shaped optical recording medium by an output of the skew sensor. The recording and / or reproducing apparatus for a disk-shaped optical recording medium according to claim 1, further comprising a skew adjusting mechanism. 4. The disc-shaped light is provided with a first guide notch portion and a second guide notch portion which constitute respective moving space portions of the first pickup device and the second pickup device. A tray for loading and unloading a recording medium is provided, and the first guide notch portion and the second guide notch portion are portions facing a drive support mechanism of the disc-shaped optical recording medium. 2. The disk-shaped optical recording medium according to claim 1, wherein the disk-shaped optical recording medium and the disk-shaped optical recording medium are continuous with each other and are formed in a tray with an angular difference from symmetrical positions sandwiching the drive support mechanism. Or a playback device.