JP3796142B2 - Disc recording or playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk recording or reproducing apparatus.
[0002]
[Prior art]
FIG. 9 is a perspective view of a conventional disk recording or reproducing apparatus, and shows the inside of the apparatus for convenience of explanation of the configuration. An opening (41) is provided on the upper surface of the cabinet (4), and the opening (41) is covered by a lid (40) pivotally supported on the upper surface of the cabinet (4). As is well known, a chassis (1) including a turntable (3) on which a disk (7) is placed and a pickup (2) provided so as to be able to approach and separate from the turntable (3) is provided. The pickup (2) is driven by a gear mechanism (not shown) on the chassis (1).
The upper surface of the pickup (2) is provided with an objective lens (20) for focusing the beam on the rear surface of the disk (7), and the movement is guided to the guide shaft (21) on the chassis (1). Both ends of the guide shaft (21) fit into brackets (18) and (18) on the chassis (1). Two guide shafts (21) are provided corresponding to both side portions of the pickup (2). For convenience of illustration, only one guide shaft (21) is shown below.
FIG. 10 is a rear view of the disk (7). A plurality of pits (73) and (73) are recessed along the circumferential direction on the signal surface of the disc (7), and when the laser beam is applied to the pit (73) and other than the pit (73) The intensity of the reflected light is different from when the laser beam is applied to the spot. As a result, a digital signal composed of 0 and 1 is reproduced.
[0003]
Recently, a DVD (digital versatile disc) on which signals are recorded at high density has been proposed as the disc (7). In the DVD, as shown in FIG. 10, the interval H between adjacent pits 73 and 73 is narrow.
For this reason, when the optical axis of the laser beam is slightly inclined with respect to the signal surface of the disk (7), there is a possibility that the pit (73) at the wrong position is irradiated and the signal cannot be reproduced correctly.
Therefore, it has been proposed to provide a tilt adjusting mechanism for the guide shaft (21) in the bracket (18). In the process of manufacturing the disk recording or reproducing apparatus, as shown in FIG. 11, the tilt adjusting mechanism is operated so that the guide shaft (21) includes the moving direction of the pickup (2) and is orthogonal to the surface of the chassis (1). The beam and the disk (7) surface are made to be exactly perpendicular to each other. As a result, the beam is accurately reflected by the disk (7), and the signal is reproduced correctly. This tilt adjustment mechanism is a well-known technique.
[0004]
[Problems to be solved by the invention]
In the conventional apparatus, when the lid (40) is opened, the pickup (2) and the objective lens (20) are exposed. For this reason, if the lid (40) is opened, dust or the like may adhere to the objective lens (20), or the objective lens (20) may be touched and damaged, and the disc may not be reproduced correctly. is there.
Further, as shown in FIG. 11, as a result of inclining the guide shaft (21), the distance S between the outer periphery of the disk and the pickup (2) may become very narrow. For this reason, there is a possibility that there is no space for providing a mechanism for protecting the objective lens (20) between the objective lens (20) and the back surface of the disk.
An object of the present invention is to provide a mechanism for protecting an objective lens with a simple structure in an apparatus in which a pickup is exposed when a lid is opened. In particular, a mechanism for protecting the objective lens is provided in an apparatus in which the distance between the objective lens and the disk is narrow.
[0005]
[Means for Solving the Problems]
On the chassis, in conjunction with the opening operation of the lid, it enters between the disc mounting surface of the turntable and the objective lens and covers the objective lens, and the objective lens is exposed in conjunction with the closing operation of the lid. A cover board is deployed,
The cover plate engages with a drive member connected to the lid, and the drive member lifts the disc from the turntable in conjunction with the opening operation of the lid, and in conjunction with the closing operation of the lid, An elevating mechanism for releasing the lifting operation is linked.
[0006]
[Action and effect]
When closing the lid body When closing the lid body (40), the lifting mechanism (5) releases the lifting of the disc, and the cover plate (8) opens to open the objective lens (20). Is exposed. When the lid (40) is closed, the disc is generally reproduced or a signal is recorded on the disc, so that when the objective lens (20) is exposed, the beam emitted from the objective lens (20) is changed to the signal surface of the disc. The signal can be recorded or reproduced.
When opening the lid body When opening the lid body (40), the lifting mechanism (5) lifts the disk in conjunction with the opening operation of the lid body (40), and the pickup (2) and the disk Increase the interval S between The cover plate (8) enters between the pickup (2) and the disk (7), covers the objective lens (20), and protects the objective lens (20) from dust and the like from the outside.
In the present invention, since the cover plate (8) opens and closes in conjunction with the lid (40), no separate drive source is required to open and close the cover plate (8), and the objective lens (20 ) Can be protected. Further, when the cover plate (8) covers the objective lens (20), the space S between the pickup (2) and the disk is widened by the elevating mechanism (5), so the cover plate (8) is smoothly within the space S. Can enter. Therefore, the objective lens (20) can be protected from dust and the like from the outside even in a device where the distance between the objective lens (20) and the disk is narrow during signal recording or reproduction.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
(overall structure)
Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a disk recording or reproducing apparatus according to this example, and shows the inside for explaining the configuration of this example. This example is characterized by a mechanism for protecting the objective lens (20). The configuration in which the pickup (2) is guided by the guide shaft (21) and approaches and separates from the turntable (3) is the same as in the prior art.
An opening (41) is provided on the upper surface of the cabinet (4), and the opening (41) is covered with a lid (40) pivotally supported on the upper surface of the cabinet (4). In the opening (41), a turntable (3) and a subchassis (15) including a pickup (2) are provided. On the back surface of the lid (40), a clamper (9) is provided for sandwiching the disk with the turntable (3).
The sub-chassis (15) is attached to the chassis (1) in the cabinet (4) via vibration-proof members (13) and (13), and the chassis (1) is provided with a backing plate (10). . On the receiving plate (10), a cover plate (8) moving in a plane orthogonal to the moving direction of the pickup (2) is slidably provided, and a long hole (80) formed in the cover plate (8) is provided. ) Is fitted into the protrusion (11) provided on the receiving plate (10) to guide the slide. The cover plate (8) overlaps the receiving plate (10) and is provided so as to be able to reciprocate between a position where the objective lens (20) is exposed and a position where the objective lens (20) is covered. The sliding mechanism will be described later.
In FIG. 1, the cover plate (8) has an arc shape, but may be a flat plate.
[0008]
A disk lifting lever (50) is provided outside the turntable (3), and the disk lifting lever (50) is pivotally supported (51) by a support piece (12) erected from the chassis (1). Move up and down. From the disc lifting lever (50), when the lifting rod (52) (52) (52) in contact with the back surface of the disc protrudes upward and the lid (40) is opened, the tip of the lifting rod (52) Is positioned above the disk mounting surface (30) of the turntable (3). That is, even if an attempt is made to place the disc on the disc placement surface (30) as it is, the disc is received at the tip of the raising rod (52) (52) (52) and is not placed on the disc placement surface (30). .
[0009]
FIG. 2 is a plan view of the chassis (1), omitting the cabinet (4) and the lid (40). FIG. 3 is a perspective view of the chassis (1). A drive member (6) is provided on the chassis (1) in the vicinity of the receiving plate (10), and the drive member (6) moves on the chassis (1) in the moving direction of the pickup (2). And a rack piece (61) that moves on the slide body (60) in the same direction as the slide body (60). As will be described later, the rack piece (61) meshes with the lid (40), and the drive member (6) moves in conjunction with opening and closing of the lid (40).
Between the ends of the rack piece (61) and the slide body (60), a tension spring (62) for biasing the rack piece (61) to the right is provided, and the rack piece (61) is mounted on the slide body (60). It is restricted from being pulled too much in contact with the stopper (64).
Slots (65) and (65) are opened in the slide body (60), and the slots (65) and (65) are fitted into bosses (not shown) on the chassis (1) to guide the movement. The The slide body (60) has an inclined hole (63) into which a fitting shaft (53) extending from the free end of the disc lifting lever (50) is fitted, and projects the fitting shaft (66) upward. . When the fitting shaft (66) fits in the hole (81) formed in the cover plate (8) with a margin and the slide body (60) moves, the cover plate (8) is attached to the slide body (60). It is pulled and moves on the backing plate (10).
[0010]
4 is a front view of the slide body (60), FIG. 5 is a view of the disk lifting lever (50) seen from the direction D in FIG. 3, and the sub chassis (15) and the turntable (3) are shown in FIG. Not shown. When the fitting shaft (53) of the disc lifting lever (50) is located at the lower end of the inclined hole (63), the disc lifting lever (50) is pivoted as shown in FIG. 51) tilts about the center, and the lifting rods (52) (52) (52) push up the disc. When the slide body (60) moves rightward as indicated by an arrow C in FIG. 4, the fitting shaft (53) rises along the inclined hole (63). As shown by the solid line in FIG. 5, the disc lifting lever (50) is in a horizontal state, and the raising rods (52) (52) (52) are lowered. That is, the disk lifting lever (50) constitutes a disk lifting mechanism (5).
[0011]
(Cover opening / closing operation)
Opened state of lid body Figs. 6 (a) and 6 (b) are views of Fig. 3 seen from the direction E, and the disk (7) is broken. FIGS. 7 (a), 7 (b), and 8 are views showing the open / close state of the lid (40). FIG. 1 is viewed from the direction F, and the pickup (2) is omitted.
As shown in FIG. 7 (a), a tooth surface (42) is formed at the base end of the lid (40), and the tooth surface (42) meshes with the rack piece (61). The lid (40) is in contact with a stopper (not shown) on the cabinet (4) and is restricted from opening too much. The lid (40) is biased in the opening direction by a torsion spring (not shown) fitted to the pivot (43), and the torsion spring attaches the rack piece (61) to the left via the tooth surface (42). The force f1 to be applied is larger than the force f2 to apply the tension spring (62) to the rack piece (61), and the force f1 and the force f2 are opposite to each other. The tension spring (62) has a small spring constant, and the amount of change in f2 is small even if it is slightly extended.
In a state where the lid (40) is opened, the rack piece (61) is located on the leftmost side, and the slide body (60) is also located on the leftmost side by the tension spring (62). The fitting shaft (53) of the disc lifting lever (50) is located at the lower end of the inclined hole (63) as shown in FIG. 7 (a). As described above, the disc lifting lever (50) lifts the disc (see FIG. 6B).
Further, since the drive member (6) is shifted to the left side, the fitting shaft (66) moves the cover plate (8) toward the objective lens (20) as shown in FIG. 6 (b). The cover plate (8) slides on the receiving plate (10) while rising along the fitting shaft (66). The tip of the cover plate (8) covers the objective lens (20) to protect the objective lens (20) from external dust.
[0012]
Closed state of lid As shown in Fig. 7 (b), the lid (40) is closed by hand against the torsion spring. The tooth surface (42) rotates counterclockwise about the pivot (43) of the lid (40) and moves the rack piece (61) to the right. The slide body (60) moves to the right together with the rack piece (61) when the stopper (64) is pushed by the rack piece (61).
The fitting shaft (53) is positioned at the upper end of the inclined hole (63), and the disc lifting lever (50) is in the horizontal state as described above. The raising rods 52, 52 and 52 are lowered, and the disc can be placed on the disc mounting surface 30 of the turntable 3 (see FIG. 6A).
Since the drive member (6) is on the right side, the fitting shaft (66) is moved to the right as shown in FIG. 6 (a) from the position where the cover plate (8) is covered with the objective lens (20). The cover plate (8) slides on the receiving plate (10) while descending along the fitting shaft (66). The objective lens 20 is exposed, and as shown in FIG. 7B, the disc is sandwiched between the clamper 9 and the turntable 3 so that signals can be recorded or reproduced.
The closed lid (40) is locked to the cabinet (4) by a lock mechanism (not shown) and keeps the closed state. If the locking mechanism is operated to manually release the locked state of the lid (40) from the cabinet (4), the lid (40) is automatically opened by a torsion spring. The drive member (6) operates in the opposite direction to the above, and the disc lifting lever (50) lifts the disc (7).
[0013]
When the disc is pressed with the lid open , as shown in FIG. 8, after placing the disc (7) on the disc lifting lever (50), the disc (7 ) May be pressed downward. In this case, if the lid (40) is closed via the drive member (6), the lid (40) and the cabinet (4) may be caught, which is dangerous. In the apparatus of this example, as shown below, the lid (40) does not close even if the disk (7) is pressed by hand.
When the disc (7) is pressed by hand, the disc lifting lever (50) rotates, and the fitting shaft (53) is lifted as shown in FIG. The fitting shaft (53) pushes the slide body (60) to the right through the inclined hole (63).
However, as described above, the force f1 that the torsion spring that urges the lid (40) urges the rack piece (61) to the left via the tooth surface (42) causes the tension spring (62) to move to the rack piece (61 ) Is larger than the force f2 for energizing the) (see FIG. 7A). Therefore, even if the slide body (60) is urged to the right and the tension spring (62) extends, the rack piece (61) does not move and the lid body (40) remains open. Therefore, even if the disk (7) is pressed by hand, the lid (40) closes carelessly, and the hand is not pinched between the lid (40) and the cabinet (4).
[0014]
In this example, since the cover plate (8) opens and closes in conjunction with the lid (40), no separate drive source is required to open and close the cover plate (8), and the objective lens (20 ) Can be protected. Further, when the cover plate (8) covers the objective lens (20), the distance S between the pickup (2) and the disk is widened by the lifting mechanism (5), so the cover plate (8) is smooth. It is possible to enter the interval S. Therefore, the objective lens (20) can be protected from dust and the like from the outside even in a device where the distance between the objective lens (20) and the disk is narrow during signal recording or reproduction.
In the above example, the lid (40) is biased in the opening direction by the torsion spring, but a leaf spring may be used instead of the torsion spring.
Further, the applicant limits the configuration of the cover plate (8) and the lifting mechanism (5), which are the features of the present application, to an apparatus in which the objective lens (20) is exposed when the lid (40) is opened. . Accordingly, as shown in FIG. 12, a tray (95) on which a disk (7) is placed is conventionally provided so as to be able to protrude and retract with respect to the cabinet (4), and the tray (95) is stored in the cabinet (4). However, the present invention does not apply to such a type of apparatus.
[0015]
The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disk recording or reproducing apparatus according to the present example, showing the inside for explaining the configuration of the present example.
FIG. 2 is a plan view of the chassis.
FIG. 3 is a perspective view of a chassis.
FIG. 4 is a front view of a slide body.
5 is a view of the disc lifting lever as viewed from the direction D in FIG. 3;
6A and 6B are views of FIG. 3 viewed from the E direction.
7A is a diagram showing an open state of a lid, and FIG. 7B is a diagram showing a closed state of the lid.
FIG. 8 is a diagram showing an open state of the lid body, and the disk is pressed from above.
FIG. 9 is a perspective view of a conventional disk recording or reproducing device, showing the inside of the device for convenience of description of the configuration.
FIG. 10 is a rear view of the disc.
FIG. 11 is a diagram when FIG. 9 is viewed from the G direction.
FIG. 12 is a side view of a conventional apparatus having a tray.
[Explanation of symbols]
(1) Chassis
(2) Pickup
(3) Turntable
(6) Drive member
(7) Disc
(8) Cover plate
(20) Objective lens
(40) Lid
(41) Opening
(60) Slide body
(61) Rack piece

Claims (2)

A lid is provided on the upper surface of the cabinet so that the lid can be opened and closed, and a chassis is provided with a turntable on which a disk is placed in an opening covered by the lid, and a pickup that can be moved close to and away from the turntable. In the disk recording or reproducing apparatus, the pickup is provided with an objective lens for focusing the beam on the signal surface of the disk.
On the chassis, in conjunction with the opening of the lid, it enters between the disc mounting surface of the turntable and the objective lens and covers the objective lens, and the objective lens is exposed in conjunction with the closing operation of the lid. A cover board is deployed,
The cover plate engages with a drive member connected to the lid, and the drive member lifts the disc from the turntable in conjunction with the opening operation of the lid, and in conjunction with the closing operation of the lid, Disc recording or reproducing apparatus in which an elevating mechanism for canceling the lifting operation is linked.   The drive member includes a slide body provided to be reciprocally movable on the chassis, and a rack piece arranged to be movable on the slide body, the lifting mechanism is engaged with the slide body, and the lid body is a first spring. The rack piece is engaged in the opening direction by the body, the rack piece meshes with the lid body, and the rack piece is moved between the rack piece and the slide body with a weaker force than the first spring body urges the rack piece. The disk recording or reproducing apparatus according to claim 1, further comprising a second spring body that is biased in the direction opposite to the first spring body.

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