JPH0896532A - Disc recording / reproducing device - Google Patents

Abstract

PURPOSE: To reduce the space required for inversion of an optical pickup and to attain a high speed inversion by invertibly supporting the optical pickup on a slide chassis and providing a drive mechanism inverting the pickup on the slide chassis. CONSTITUTION: When a motor 21 for mode of an inversion drive mechanism 20 of a pickup inversion mechanism 20 is driven, its rotational fore is transmitted to a mode gear 23 from a worm-gear 25 through a gear line 22, and a bevel gear part 29 is engaged with a bevel gear 24. Thus, the gear 24 is rotated, and a pickup support chassis 18 integrated with the gear 24 is turned around turning shafts 18a, 18b of both ends in the longitudinal direction of the chassis. By the turning of the chassis 18, a lock pin 33 engaging with a cam part 32b of a lock member 32 of a pickup mechanism 30 depresses the member 32 against a spring 34, and gets over the cam part 32b, and the lock of the mechanism 30 is released, and a cam pin 55a parts from the cam part of the gear 54. Further, when the chassis 18 continues to turn, the pin 33 comes into contact with the cam part 32b, and the chassis 18 is inverted, and an optical head faces a disk surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to both sides of a disc or to two disc surfaces provided at appropriate intervals.
The present invention relates to a disc recording / reproducing apparatus that records and / or reproduces information with one optical pickup.

[0002]

2. Description of the Related Art Conventionally, generally, in an optical disk device in which a plurality of optical disks are installed stepwise on the same axis,
One optical pickup was arranged for one disk. Therefore, as the number of discs increases,
Correspondingly, the number of optical pickups and the mechanisms and circuits for driving the pickups have increased, and as a result,
There is a problem that the cost of the device itself increases.

Therefore, it is conceivable that one optical pickup is moved between a plurality of optical disks to selectively access all the optical disks with one optical pickup. In this case, it is necessary to reverse the optical pickup in order to record and reproduce on both sides of the disc or on the two disc faces of the adjacent optical discs facing each other.
Therefore, an inverting mechanism for the optical pickup is required.

As a method of reversing the optical pickup, for example, a method of rotating the entire optical pickup assembly including a slide drive system can be considered.

[0005]

However, in the method of rotating the entire optical pickup assembly,
Since the weight of the optical pickup assembly is heavy, it is difficult to perform a high-speed reversing operation, and a large space for reversing is required, which increases the size of the entire optical disc device. Moreover, when the optical pickup assembly is inverted, the slide drive system changes to the reverse position. Therefore, the slide drive system (for example, a rack or the like) also needs two sets, one for the forward rotation position and the other for the reverse position. However, there is a problem in that the mechanism is complicated due to increase in

Incidentally, as an apparatus which uses the optical pickup by reversing it, there is a double-sided reproducing mechanism of a laser disk. In this mechanism, the optical pickup moves between both sides of one disk, It does not have a mechanism for selectively recording / reproducing two opposite surfaces between two disks with an optical pickup.

The present invention has been made in view of the above problems, and the space required for reversing the optical pickup is reduced by reversibly mounting the optical pickup on the slide member and reversing only the optical pickup. Moreover, it is an object of the present invention to provide a disk recording / reproducing device capable of high-speed inversion.

[0008]

In order to solve the above-mentioned problems and the like and to achieve the above-mentioned objects, the present invention slides in the radial direction of the disk 1 as shown in FIGS. 1 to 15, for example. In a disc recording / reproducing apparatus in which the chassis 9 is moved and the optical pickup 8 mounted on the slide chassis 9 records and / or reproduces information on a plurality of disc surfaces, the optical pickup 8 is mounted on the slide chassis 9. The present invention is characterized in that pickup reversing drive mechanisms 20, 90, 110 for reversibly supporting and reversing the optical pickup 8 on the slide chassis 9 are provided.

In the disc recording / reproducing apparatus of the present invention, as shown in FIGS. 1, 14 and 15, for example, the pickup reversing drive mechanism 20, 90, 110 is preferably provided on the slide chassis 9.

Further, the disk recording / reproducing apparatus of the present invention is
For example, as shown in FIGS. 1 and 14, the pickup reversing drive mechanism 20, 90 includes a bevel gear 24, 98 fixed to a pickup support chassis 18 to which the optical pickup 8 is attached, and a bevel gear 24, 98 intermittently. Mode gears 23 and 95 which have bevel teeth 29 and 99 that can be engaged and are rotatably supported by the slide chassis 9;
The mode gears 23 and 95 can be configured to include the motors 21 and 91 that are rotationally driven via the gear trains 22 and 92.

Further, the disk recording / reproducing apparatus of the present invention is
For example, as shown in FIG. 15, the pickup inversion drive mechanism 110 includes a pinion 120 fixed to a pickup support chassis 18 to which the optical pickup 8 is attached.
A rack 119 that meshes with the pinion 120, a swing lever 118 that advances and retracts the rack 119, and a mode gear 115 that has a cam groove 115a that is rotatably supported by the slide chassis 9 and that swings the swing lever 118. ,
The mode gear 115 may be configured to include the motor 111 that is rotationally driven via the gear train 112.

Furthermore, the disk recording / reproducing apparatus of the present invention is, for example, as shown in FIGS. 1, 14 and 15, the motor 2 of the pickup reversing drive mechanism 20, 90, 110.
1, 91, 111 can also serve as a motor for skew servo.

The disk recording / reproducing apparatus of the present invention is
For example, as shown in FIGS. 3 to 5, a pickup lock mechanism 30 that locks the pickup support chassis 18 at the forward / reverse position may be provided.

[0014]

The present invention has the above-mentioned configuration,
After recording / reproducing information on / from one of the disc surfaces by the optical pickup 8 mounted on the slide chassis 9,
Pickup inversion drive mechanism 20, 90, 11 at that position
By operating 0 and reversing the optical pickup 8, it is possible to continuously record and / or reproduce information on the other disk surface.

By providing the pickup reversing drive mechanism 20, 90 on the slide chassis 9, the weight of the reversing portion can be reduced and the optical pickup 8 can be reversed easily and quickly.

Further, the pickup inversion drive mechanism 20, 9
0 is composed of bevel gears 24 and 98, mode gears 23 and 95, and motors 21 and 91, and the rotational force of the motors 21 and 91 is transmitted to the mode gears 23 and 95 via the gear trains 22 and 92, and the umbrella thereof. Bevel gears 24 and 98 with teeth 29 and 99
By rotating the pickup support chassis 18
And the optical pickup 8 can be inverted.

Further, the pickup reversing drive mechanism comprises a pinion 120, a rack 119, a rocking lever 118, a mode gear 115, a gear train 112 and a motor 111, and the rotational force of the motor 111 is the gear train 112 and the mode gear 11.
5 to the rocking lever 118, and the pin 12
By sliding 3 into the slot 124 and advancing and retracting the rack 119, the pickup support chassis 18 can be reversed through the pinion 120 and the optical pickup 8 can be reversed.

Furthermore, the pickup inversion drive mechanism 20,
The motors 21, 91, and 111 of 90 and 110 can also serve as the motors for skew servo.
The number of motors used can be reduced.

Further, by locking the pickup support chassis 18 with the pickup lock mechanism 30, the optical pickup 8 can be locked and held in the forward or reverse position.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. 1 to 13 show a first embodiment of the present invention. FIG. 1 is a plan view of a disk recording / reproducing apparatus, FIG. 2 is a front view thereof, and FIGS. 3 to 5 are views showing a pickup reversing drive mechanism. 6 and 7 are enlarged views of the main part of the pickup lock mechanism, FIGS. 8 and 9 are views showing a gear with a cam, FIGS. 10 and 11 are views showing a pinion escape mechanism, and FIG. 12 is an elevator chassis. FIG. 13 is a cross-sectional view taken along the longitudinal direction, and FIG. 13 is a view showing each embodiment taken along the width direction of the elevator chassis. Also, FIG.
4 is a diagram showing a second embodiment of the present invention, and FIG. 15 is a diagram showing a third embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 1 is an optical disc showing a specific example of a disc capable of recording and / or reproducing information. A plurality of optical discs (five in this embodiment) 1 are spindles. A rotary shaft 4 protruding from the motor 2 onto the base plate 3 is fixed in a horizontal state at a predetermined interval. The spindle motor 2 is fixed to the back surface of the base plate 3, and the rotation of the rotary shaft 4 causes the five optical disks 1 to rotate integrally. This spindle motor 2
The legs 5 are attached to the four corners on the back of the base plate 3 so as to surround the
Is fixed.

A box-shaped main chassis 6 is fixed to the upper surface of the base plate 3 by fixing means such as fixing screws 7 so as to cover the front half surfaces of the five optical disks 1.
An opening 10 is provided in the center of the front surface of the main chassis 6 so that a slide chassis 9 having an optical pickup 8 can be moved in the radial direction along the disk surface of the optical disk 1. The rear surface plate 6a is provided with window holes through which the five optical disks 1 pass. Further, the opening 10 of the slide chassis 9
Bearing plates 11 and 12 are mounted on both the left and right sides of the main chassis 6, and between the bearing plates 11 and 12 and the rear surface plate 6a of the main chassis 6 in the vertical direction corresponding to the five optical disks 1. A set of two main guide shafts 13, 13 in stages
Are attached so that they are parallel to each other in the left-right direction.

The front ends of the main guide shafts 13 are rotatably supported by the bearing holes of the five bearing pieces 11a and 12a provided on the bearing plates 11 and 12, respectively, and the rear ends thereof are provided on the rear plate 6a. Each of the main guide shafts 13 is axially supported by a hole, and a ring-shaped shaft stopper 14 is laterally engaged with an annular groove provided at a rear end portion of each main guide shaft 13 to prevent the main guide shaft 13 from coming off in the axial direction. One set of main guide shaft 1
Guide bearings 15 and 16 are slidably fitted in 3 and 13, respectively, and these guide bearings 15 and 16 are fixed to the back surface of the slide chassis 9. And the bearing plate 1
In order to avoid the bearing pieces 11a and 12a of the first and the second bearings 12, the bearing hole of the one guide bearing 15 is opened laterally and the bearing hole of the other guide bearing 16 is opened downward. Bearing pieces 11a, 1 of the guide bearings 15, 16
2a is allowed to pass.

Further, racks 19 are arranged in parallel inside the five main guide shafts 13 located on one side of the opening 10. The rear ends of these five racks 19 are fixed to the inner surface of the rear plate 6a of the main chassis 6 by a fixing means such as a fixing screw, and the bearing plate 12 is provided at the front end.
The bearing piece 12a and the fixed piece 12b provided side by side are engaged from below, whereby the rack 19 is attached to the main chassis 6 with its teeth facing the inside opposite to the main guide shaft 13. There is. In this rack 19, the slide chassis 9 has an elevator chassis 62 as described later.
The length is set so that you can completely transfer to.

Further, as shown in FIGS. 3 to 5, an opening window 17 is provided in the slide chassis 9, and a pickup supporting chassis 18 penetrates the opening window 17. Rotating shafts 18a and 18b projecting outward are provided at both ends of the pickup supporting chassis 18 in the left-right direction, and one rotating shaft 18a is pivotally supported by a bearing piece 9a of the slide chassis 9 while the other rotating shaft is rotated. The shaft 18b is rotatably supported by one of the guide bearings 15, whereby the pickup supporting chassis 18 is rotatably rotatably supported by the slide chassis 9 with the axis of the shaft 18 oriented in the left-right direction. Therefore, the pickup support chassis 18 can be turned upside down with respect to the slide chassis 9, and the optical pickup 8 is mounted on the pickup support chassis 18. As a result, the optical pickup 8 is turned upside down with the reversing operation of the pickup supporting chassis 18, and as shown in FIG. 3, when the pickup supporting chassis 18 is facing upward, the optical head 8a faces upward, and as shown in FIG. When the pickup support chassis 18 changes downward, the optical head 8a faces downward.

In this way, the pickup supporting chassis 18
A pickup reversing drive mechanism 20 is provided on the slide chassis 9 for reversing. The pickup inversion drive mechanism 20 includes a mode motor 21, a mode gear train 22, a mode gear 23, and a bevel gear 24. The mode motor 21 is fixed to the back surface of the slide chassis 9. A worm 25 is fixed to the rotating shaft of the mode motor 21.
The worm wheel 26 is meshed with the gear 5.

The mode gear train 22 includes a worm 25.
And a worm wheel 26, a gear 26a integrally formed with the worm wheel 26, a gear 54 with a cam meshing with the gear 26a, a gear 27a meshing with the gear 54 with a cam, and a gear 27a integrally formed with the gear 27a. And a gear 27 that meshes with the mode gear 23, and these gears are rotatably supported by the slide chassis 9.

As shown in FIGS. 8 and 9, the cam-equipped gear 54 has cylindrical cam portions 54a and 54b projecting in the axial direction on both sides of the gear body, and both cam portions 54a and 54b.
Form an end face cam. These cam portions 54a, 5
Reference numeral 4b designates a vertically symmetrical shape, a horizontal holding surface 85a for holding the optical pickup 8 in a horizontal state with respect to the slide chassis 9, and a slide chassis provided at a position rotationally displaced by 180 degrees from the horizontal holding surface 85a. An inclined holding surface 85b for holding the optical pickup 8 in a state of being inclined at a predetermined angle with respect to 9 and two intermediate inclined surfaces 85c for smoothly connecting the inclined holding surface 85b and the horizontal holding surface 85a are formed. There is.

The cam surfaces of these cam portions 54a and 54b (horizontal holding surface 85a, inclined holding surface 85b, and intermediate inclined surface 85).
Reference numeral c) serves as a stopper for the rotation operation of the pickup support chassis 18, and
Pair of cam pins 55a, 5 provided at symmetrical positions on both sides of the
The cam pin 55a (or 55b) of the side 5b corresponding to the direction of the optical pickup 8 is pressed against the cam surface of the cam portion 54a (or 54b) located on the side corresponding to the rotational force received from the pickup lock mechanism 30 described later. To be done. As a result, the posture of the pickup support chassis 18 with respect to the slide chassis 9 is positioned at an arbitrary tilted state within the angle range from the horizontal state to the tilted state of a predetermined angle, and therefore the cam geared gear 54 rotates to skew. The amount can be adjusted.

As described above, in this embodiment, the mode motor 21 also serves as the skew servo motor, and the mode motor 21 and the skew servo gear train (worm 25, worm wheel 26, gear 26a, 27,
27a and gear 54 with cam, and a pair of cam pins 55a,
55b constitutes a skew servo mechanism. With this skew servo mechanism, the skew servo can be activated to maintain the optical pickup 8 in an optimum state.

Therefore, in the present embodiment, one mode motor 21 also functions as a skew servo motor and functions as two motors, so that the cost for one motor can be reduced. Further, the rotation angle of the mode gear 23 in the traveling mode is set to be larger than the adjustment range of the gear 54 with cam for skew adjustment.

Further, as shown in FIGS. 3 to 5, the mode gear 23 includes a support shaft 28 fixed to the slide chassis 9.
Is rotatably supported by the slide chassis 9. The mode gear 23 is provided with a bevel gear portion 29 forming a part of a bevel gear on a part of the back surface in the circumferential direction, in addition to the tooth portion provided on the entire outer circumference.
4 can be engaged. The bevel gear 24 is fixed to the base portion of one rotation shaft 18 a of the pickup support chassis 18 and rotates integrally with the pickup support chassis 18. Therefore, while the bevel gear 24 meshes with the beveled tooth portion 29, the pickup support chassis 18 also rotates integrally, and when the bevel gear 24 disengages from the beveled tooth portion 29,
The rotation of the pickup support chassis 18 is also stopped.

The length of the beveled tooth portion 29 is such that the pickup supporting chassis 18 can be rotated by half, that is,
The number of teeth of the bevel gear portion 29 is formed to be 1/2 of the number of teeth of the bevel gear 24. Reference numeral 31 shown in FIG. 4 is a coil spring that biases the pickup support chassis 18 toward the guide bearing 15 side via the bevel gear 24.

Such a pickup supporting chassis 18
The pickup supporting chassis 18 in connection with the reversing operation of the
Is provided on the upper surface or the lower surface, there is provided a pickup lock mechanism 30 that locks the upper surface or the lower surface and holds the pickup support chassis 18 upward or downward under a predetermined external force or less. The pickup lock mechanism 30 includes a lock member 32, a lock pin 33, and a lock spring 34.

The lock member 32 has a rod-shaped shaft portion 32a,
The shaft portion 32a includes a cam portion 32b provided at one end of the shaft portion 32a, and two long holes 32c and 32c are formed in a tandem shape in the shaft portion 32a. These long holes 32c, 32c have guide pins 35 fixed to the slide chassis 9,
35 are slidably inserted, and the locking ring 36 engaged with the tip of each guide pin 35 prevents the lock member 32 from falling off. Further, the cam portion 32b has a triangular mountain shape, so that two cam surfaces inclined in opposite directions are formed on both upper and lower surfaces.

The lock member 32 has a spring receiving piece 32d.
Is provided, and the lock spring 34 is attached to the spring receiving piece 32d.
One end of is locked. The other end of the lock spring 34 is locked to a spring receiving piece 9b provided on the slide chassis 9. The spring force of the lock spring 34 causes the lock member 32 to be a cam portion which is one of the axial direction of the shaft portion 32a. 32
It is biased to the b side. The lock pin 33 provided on the pickup support chassis 18 is pressed against one of the cam surfaces of the cam portion 32b, and the spring force of the lock spring 34 causes the lock pin 33 to move upward to the pickup support chassis 18 in accordance with the inclination direction of the cam portion 32b. Alternatively, a downward rotating force is applied.

Two lock pins 33 are provided at symmetrical positions on both side surfaces of the pickup support chassis 18. One of the lock pins 33 is a lock member regardless of whether the optical pickup 8 is at the upper or lower position. It is configured to be arranged at a position facing 32.

Further, a slide motor 40 is fixed to the back surface of the slide chassis 9. 10 and 1
As shown in FIG. 1, the rotational force of the sliding motor 40 is transmitted to the rack 19 via the sliding gear train 42.
The slide gear train 42 includes a worm 41 fixed to a rotation shaft of a slide motor 40, and the worm 41.
The worm wheel 43 meshes with each other, a plurality of intermediate gears 44a to 44c, and the pinion 45 with which the intermediate gear 44c at the end meshes. The pinion 45 is rotatably supported by an arm 47 by a pinion shaft 46, and the arm 47 is rotatably supported by the slide chassis 9 by a gear shaft 48. This gear shaft 4
An intermediate gear 44c is rotatably supported by the shaft 8, and the pinion 45 can be rotated outside the intermediate gear 44c by the rotation of the arm 47.

Further, a spring 49 is stretched between the arm 47 and the slide chassis 9, and the spring force of the spring 49 causes the pinion 45 to constantly move to the rack 1.
It is biased to the 9 side. The spring force of the spring 49 is set such that the pinion 45 does not escape from the rack 19 and the meshed state is not released even when the sliding motor 40 is rotated at the maximum torque under the use condition.
By providing the spring 49, it is possible to eliminate the backlash between the traveling gears.

Thus, when the rotational force of the sliding motor 40 is transmitted from the worm gear 41 to the pinion 45 through the sliding gear train 42 while the rack 19 is engaged with the pinion 45, the sliding movement of the pinion 45 causes the sliding chassis. 9 moves in the radial direction of the optical disc 1. As a result, the pickup supporting chassis 18 moves integrally with the slide chassis 9, and the optical head 8a of the optical pickup 8 mounted on the pickup supporting chassis 18 moves on the disk surface in the radial direction to reproduce information. .

Further, a cam pin 51 is fixed to the arm 47 and penetrates the slide chassis 9 upward to engage with a cam groove 50 provided on the back surface of the mode gear 23. Therefore, the cam pin 51 is also urged against the cam surface 50 a of the cam groove 50 by the spring force of the spring 52.
The rotational movement of the arm 47 is also restricted by 0.

On the cam surface 50a of the mode gear 23,
A lift mode region UD that is continuous with a constant radius of curvature over almost a half circumference, and a travel mode region SL that is a combination of a straight arc and a straight line provided with a lift by lowering the middle arc portion in the remaining half circumference region. There are two mode regions, and a sensor (not shown) is provided so that each position can be stopped. The running mode area S of the cam surface 50a
L, as shown in FIG.
11 is a region for moving the slide chassis 9 in the radial direction of the optical disc 1 by engaging with, and the elevating mode region UD moves the slide chassis 9 to the outer side in the radial direction of the optical disc 1, as shown in FIG. It is an area for allowing the pinion 45 to escape from the rack 19 and then move vertically between the optical discs 1 after the rotation.

According to the present embodiment, in the traveling mode, the pinion 45 meshes with the rack 19 by the urging force of the spring 49 before the cam pin 51 contacts the traveling mode area SL of the cam surface 50a. It is in a free state without being regulated by the groove 50. On the other hand, in the ascending / descending mode, the cam pin 51 moves in the ascending / descending mode region UD of the cam surface 50a.
Since the pin position is regulated by being pressed against the spring 4,
The arm 47 is rotated against the urging force of the pinion 4 and the pinion 4
5 escapes from the rack 19. The cam groove 50 of the mode gear 23, the arm 47, and the spring 49.
The cam pin 51 and the cam pin 51 constitute a pinion releasing mechanism that releases the pinion 45 from the rack 19 corresponding to one optical disc 1 to release the mesh.

A pair of left and right upper and lower guide shafts 60, 60 are provided in parallel on both front sides of the opening 10 of the main chassis 6. The upper and lower guide shafts 60 are supported at both ends by fitting the lower end to the base plate 3 and the upper end to the upper surface plate 6a of the main chassis 6. Vertical bearings 61, 61 are slidably fitted to the vertical guide shafts 60, 60, and both ends of an elevator chassis 62 are fixed to the lower ends of the vertical bearings 61, 61. Therefore, the elevator chassis 62
Is a pair of upper and lower bearings 61, 61, and
Guided by 0, 60, it can move smoothly in the vertical direction.

The elevator chassis 62 is in the form of a box that opens upward and backward, and the slide chassis 9 can be moved in and out from the rear. Therefore, in the elevator chassis 62, the guide bearing 1 of the slide chassis 9
A pair of sub-guide shafts 63, 63, into which 5 and 16 can be removably fitted, are attached in parallel with each other.
The front ends of the sub guide shafts 63 are pivotally supported by bearing holes 57 provided in the front plate 62a of the elevator chassis 62, and the rear ends thereof are respectively supported by bearing holes 58 provided in the bearing piece 62c of the rear plate 62b. It is pivotally supported. Then, the ring-shaped shaft stopper 64 is laterally engaged with the annular groove 59 provided at the front end portion of each sub guide shaft 63, thereby preventing the sub guide shaft 63 from moving in the axial direction, The elevator chassis 62 is prevented from coming off.

The pair of sub guide shafts 63, 63 attached to the elevator chassis 62 in this way are in mutual axial centers with the pair of main guide shafts 13, 13 at the stop position of the elevator chassis 62 with respect to each optical disk 1. Is set to be almost coaxial. Then, guide taper surfaces 13a and 63a are provided at end portions of the main guide shaft 13 and the sub guide shaft 63 that face each other, whereby the guide bearings 15 and 63 are provided for the guide shafts 13 and 63, respectively.
The fitting of 16 is made easy.

Further, rollers 66, 66 have roller shafts 67, 6 at the center of the side surfaces of the elevator chassis 62 on the left and right sides.
7 are rotatably supported respectively. These rollers 66, 66 are slidably inserted in the cam grooves 69, 69 of a pair of elevator cams 68, 68 arranged on the outer side thereof, and the elevator chassis 62 causes the elevator chassis 62 to move. It is configured to be movable in the vertical direction.

The pair of elevator cams 68, 68 are cylindrical bodies having spiral cam grooves 69, 69 formed on their outer peripheral surfaces, and their lower ends are rotatably supported by the base plate 3.
The upper end is rotatably supported by the upper surface plate 6b of the main chassis 6. Cam groove 6 of this elevator cam 68, 68
9 and 69 are set so that the height of one disk can be moved by one rotation, and stop positions 69a and 69a are provided so that the height does not change within a certain angle range. At the stop positions 69a, 69a, the rollers 66,
66 is positioned in the height direction.

Then, the pair of elevator cams 68, 68
Are configured to rotate in the same phase and in the same direction through the operation of a motor and a gear train (not shown). Also, FIG.
Reference numeral 70 denotes a cam drive gear fixed to the lower end of each elevator cam 68. A gear at the end of the gear train is meshed with this cam drive gear 70, and the pair of elevator cams 68, 68 are rotated by the rotational force of the motor. Are simultaneously driven to rotate.
Therefore, the height of the elevator chassis 62 from the base plate 3 changes while always maintaining the same height on the left and right. The cam drive gear 70, the gear train, and the motor constitute an elevator cam drive mechanism for driving the pair of elevator cams 68, 68.

Furthermore, the main chassis 6 is provided with a height detection sensor 72 for detecting the stop position of the elevator chassis 62 in accordance with the stop position. The height detection sensor 72 is provided at five locations corresponding to the five optical disks 1, and the elevator chassis 62
It is possible to detect which one of the five optical disks 1 the elevator chassis 62 corresponds to by the on / off operation of the detection piece 73 provided at the position. Further, the base plate 3 is provided with a rotation angle detection sensor 74 for stopping the elevator chassis 62 at an accurate height. The rotation angle detection sensor 74 can detect a specific one position of the elevator cam 68 for each rotation of the elevator cam 68 by the on / off operation of the detection piece 75 provided on the elevator cam 68.

Reference numeral 76 shown in FIG. 1 is an out-limit switch made up of a push switch, and 77 is an in-limit switch also made up of a push switch. The out-limit switch 76 is for detecting whether or not the slide chassis 9 having the optical pickup 8 is completely transferred to the elevator chassis 62.
It is fixed to the front part of the back surface of the slide chassis 9. Then, the sensor dog 78 fixed to the elevator chassis 62 is turned on by being brought into contact with the sensor dog 78, whereby the state where the slide chassis 9 is completely transferred to the elevator chassis 62 is detected. The in-limit switch 77 is for limiting the movement of the slide chassis 9 inward in the radial direction of the optical disc 1, and is fixed to the rear portion of the back surface of the slide chassis 9. And the main chassis 6
The rear surface plate 6a is brought into contact with the rear surface plate 6a to be turned on, whereby the innermost position of the slide chassis 9 is detected.

The slide chassis 9, the five pairs of main guide shafts 13, the pair of guide bearings 15 and 16, and the five racks 1
9, the pinion 45, the sliding motor 40, and the sliding gear train 42 form a first moving mechanism. Also,
The pair of vertical guide shafts 60, the pair of vertical bearings 61, the elevator chassis 62, the pair of auxiliary guide shafts 63, the pair of rollers 66, the pair of elevator cams 68, and the elevator cam drive mechanism constitute a second moving mechanism. ing.

In the disk recording / reproducing apparatus having such a structure, the reversing operation of the optical pickup 8 is performed as follows, for example. First, when the optical pickup 8 faces upward, the optical head 8a of the optical pickup 8 faces upward.
By a, information can be reproduced on the disc surface below the optical disc 1 located above.

Next, a case where information is reproduced on the disc surface of the optical disc 1 located below will be described. In this case, the pickup inversion drive mechanism 20 is operated. First, from the state shown in FIG. 3, by driving the mode motor 21 of the pickup reversing drive mechanism 20, the rotational force is changed from the worm 25 to the mode gear train 22 (the worm wheel 26, the gear 26a, and the cam-equipped gear 54). It is transmitted to the mode gear 23 via the gear 27a and the gear 27), and the bevel gear 24 is meshed with the bevel gear 24 by rotating the mode gear 23.

As a result, the bevel gear 24 starts to rotate, and the pickup supporting chassis 18 integrated with the bevel gear 24 starts to rotate about the rotating shafts 18a and 18b at both ends in the longitudinal direction. At this time, due to the rotation of the pickup support chassis 18, the lock pin 33 engaged with the cam portion 32b of the lock member 32 of the pickup lock mechanism 30 resists the spring force of the lock spring 34 as shown in FIG. Then, the lock member 32 is pushed down, and after passing through the state shown in FIG. 6 and the state shown in FIG. As a result, the lock of the pickup lock mechanism 30 is released, and the cam pin 55a on the left side in FIG. 3 pivots rearward in the drawing to separate from the cam portion 54a on the gear 54 with cam.

Further, when the pickup support chassis 18 continues to rotate in accordance with the increase in the rotation amount of the mode gear 23,
The right cam pin 55b rotates forward in the plane of the drawing, approaches the cam portion 54b below the gear 54 with cam, and contacts the cam surface. At this time, the rotation of the pickup support chassis 18 causes the lock pin 33 to come into contact with the cam portion 32b of the lock member 32, resisting the spring force of the lock spring 34 from the state shown in FIG. 7 to the state shown in FIG. And pushes down the lock member 32 to get over the cam portion 32b. As a result, the pickup support chassis 18 is locked by the pickup lock mechanism 30 via the lock pin 33, and the pickup support chassis 18 is held in an inverted state with respect to the slide chassis 9.

As a result, the pickup support chassis 18
The optical pickup 8 integrated with the
The optical head 8a faces the disk surface on the optical disk 1 located below. As a result, information can be reproduced on the disc surface above the optical disc 1 below.

If the mode gear 23 continues to rotate even after the optical pickup 8 is directed downwards in this way, the number of teeth of the bevel gear 29 causes the bevel gear 24 to rotate half a turn so that the lock pin 33 causes the lock member 32 to rotate. Since it is set so as to mesh with each other until it goes over the cam portion 32b, the rotational force of the mode gear 23 is not transmitted to the bevel gear 24 after the lock pin 33 goes over the cam portion 32b. as a result,
Only the rotational force from the cam portion 32b based on the biasing force of the lock member 32 acts on the pickup support chassis 18, and the cam pin 55b is pressed against the cam portion 54b under the gear 54 with cam by this rotational force, and such a pickup is performed. Due to the function of the lock mechanism 30, the pickup supporting chassis 18
Is locked in the reverse position.

In this way, the pickup support chassis 18
Is locked, in other words, the mode gear 23
The cam shape and the gear ratio of various gears are set so that the skew amount can be adjusted within a range in which the bevel gear 24 and the bevel gear 24 do not mesh with each other. This skew correction is performed by driving the mode motor 21 and the like by the action of a skew sensor (not shown) fixed integrally with the optical pickup 8.

That is, based on the detection result of the skew sensor, the control signal for skew correction is the mode motor 21.
Is supplied to the mode motor 21, the mode motor 21 rotates by a predetermined number according to the control signal, and the cam gear 54 rotates by a predetermined angle according to the correction amount. The rotation of the gear 54 with cam causes the cam portions 54a and 54b to rotate integrally, so that the cam pin 55b pressed against the cam surface of the cam portion 54b.
Moves up and down following the lift change of the cam portion 54b.
As a result, the vertical movement of the cam pin 55b causes the pickup support chassis 18 to rotate about the rotation shafts 18a and 18b, and in this way, skew correction in the reversing direction of the optical pickup 8 is performed. The skew correction in the direction intersecting the reversing direction of the optical pickup 8 is performed by a correction mechanism (not shown) that is separately provided (for example, the motor, the gear train, the cam gear, and the cam pin). .

By providing such a skew servo mechanism, it is possible to use both the skew motor and the pickup reversing motor, so that the number of motors to be used can be reduced and the cost can be reduced. The circuit configuration can be simplified. In this embodiment, the embodiment in which the skew servo mechanism is provided has been described, but the skew servo mechanism may not be provided.

Next, when the optical pickup 8 inverted as described above is returned to the original upward state, the mode motor 21 is rotated in the reverse direction to perform the operation reverse to the above operation. In this way, the mode motor 2
When 1 is rotated in the reverse direction, the mode gear 23 rotates in the opposite direction through the mode gear train 22, and the bevel gear 24 meshes with the bevel gear portion 29 of the mode gear 23, whereby the pickup pickup supporting chassis 18 moves in the reverse direction. The optical pickup 8 is turned over and returned to the original upward state. Then, the pickup support mechanism 18 is locked at the forward rotation position by the action of the pickup lock mechanism 30.

The second embodiment of the present invention shown in FIG. 14 is a modification of the arrangement of the pickup reversing drive mechanism 20 shown in the first embodiment. That is, in the first embodiment, the pickup reversing drive mechanism 20 is arranged in the same direction as the slide moving mechanism, but in the present embodiment, the pickup reversing driving mechanism 90 is arranged on the opposite side of the slide moving mechanism. The optical pickup 8 is configured to be sandwiched from both sides in the longitudinal direction.

The pickup reversing drive mechanism 90 comprises a drive motor 91, a mode gear 95, and a gear train 92 for transmitting the rotational force of the drive motor 91 to the mode gear 95. The gear train 92 meshes with a worm 93a fixed to the rotation shaft of the drive motor 91, a worm wheel 93b meshing with the worm 93a, a gear 94 integrally formed with the worm wheel 93b, and a mode gear 95. And a gear 96. Mode gear 9
A bevel gear 99 is formed on one surface of the gear 5, and a bevel gear 98 meshes with the bevel gear 99. The two gears 94 and 96 are arranged on both sides of the mode gear 95, and the cam portion 54 is provided on the upper surfaces of the gears 94 and 96.
Cam portions 94a and 96a similar to those of a and 54b are provided.

Further, the bevel gear 98 is fixed to a rotary shaft 18b of the pickup supporting chassis 18 opposite to the rotary shaft 18a. The rotary shaft 18b is rotatably mounted on a bearing piece 9c of the slide chassis 9. It is supported. And
A cam pin 97 is projectingly provided on the end surface of the pickup supporting chassis 18 on the rotating shaft 18b side.
Is selectively pressed by the cam portion 94 a of the gear 94 and the cam portion 96 a of the gear 96 as the pickup supporting chassis 18 is reversed.

Thus, by the rotation of the mode gear 95,
While the bevel gear 98 meshes with the bevel gear 99, the pickup support chassis 18 is moved by the length of the bevel gear 99.
It rotates about the rotating shafts 18a and 18b. Therefore,
When the optical pickup 8 faces upward, the cam pin 97
Is pressed by the cam portion 94a of the gear 94, and the optical pickup 8 is driven by the reverse operation of the pickup reverse drive mechanism 90.
Is changed downward, the cam pin 97 is pressed by the cam portion 96a of the gear 96. Since the pickup inversion drive mechanism 90 also functions as a skew servo mechanism,
Skew correction in the reversing direction of the optical pickup 8 can be performed by the same operation as described in the first embodiment.

Reference numeral 100 shown in FIG. 14 is a skew servo mechanism for performing skew correction in a direction intersecting with the inversion direction of the optical pickup 8. The skew servo mechanism 100 includes a drive motor 101, a drive pulley 102 fixed to the rotation shaft thereof, a drive belt 103 having one side wound around the drive pulley 102, and a driven belt having the other side wound around the drive belt 103. Pulley 104,
Worm 10 formed integrally with this driven pulley 104
5 and a worm wheel 106 that meshes with the worm 105, and the drive motor 101 and the like are mounted on the pickup support chassis 18.

Further, the worm wheel 106 is provided with a cam portion 106a similar to the cam portions 94a and 96a, and the cam pin 107 is pressed against the cam portion 106a. The cam pin 107 is fixed to a plate 108 to which the optical pickup 8 is attached, and the plate 108 is supported by a pickup support chassis 18 via a support shaft 109 so as to be swingable in a direction intersecting the inversion direction. . The other structure is the same as that of the first embodiment, and the same parts are designated by the same reference numerals and the description thereof will be omitted.

According to the second embodiment having such a structure, since the slide chassis 9 and the pickup support chassis 18 expand in the lateral direction (direction intersecting with the longitudinal direction), there is a space in the lateral direction. It is valid.

The third embodiment of the present invention shown in FIG. 15 uses a rack and pinion for the pickup inversion drive mechanism. This pickup inversion drive mechanism 110
Is composed of a drive motor 111, a mode gear 115, and a gear train 112 that transmits the rotational force of the drive motor 111 to the mode gear 115. This gear train 112
Worm 113 fixed to the rotary shaft of drive motor 111
a, a worm wheel 113b that meshes with the worm 113a, a gear 114 integrally formed with the worm wheel 113b, and a cam gear 116 that meshes with the gear 114, and the cam gear 116 includes a mode gear. 115 meshes.

Cam portions 116a and 116a similar to the cam portions 94a and 96a are provided on both surfaces of the gear with cam 116, and one cam portion 116a has a pair of cam portions provided on both sides of the pickup support chassis 18. Cam pin 117
One side is pressed. Further, the mode gear 115 is provided with a cam groove 115a.
A pin 121 provided at one end of a rocking lever 118 is slidably engaged with this. The swing lever 118 is the rotary shaft 1.
The pin 123 provided at the other end is slidably engaged with an elongated hole provided at one end of the rack 119. The rack 119 is held by the slide chassis 9 so as to be movable only in the lateral direction X shown in the drawing, and the pinion 120 fixed to the rotation shaft 18b of the pickup support chassis 18 is engaged with the rack 119. are doing.

Reference numeral 130 shown in FIG. 15 is a skew servo mechanism for performing skew correction in a direction intersecting the inversion direction of the optical pickup 8. The skew servo mechanism 130 has a drive motor 131, a worm 132 fixed to its rotation shaft, and a worm wheel 133 meshing with the worm 132. The drive motor 131 and the like are mounted on the pickup support chassis 18. ing. The worm wheel 133 has cam portions 94a, 9
A cam portion 133a similar to that of 6a is provided, and the cam pin 134 is pressed against this cam portion 133a. The other structure is similar to that of the second embodiment, and the same parts are designated by the same reference numerals and the description thereof will be omitted.

According to the third embodiment having such a structure,
When the rotational force of the drive motor 111 is transmitted from the worm 113a to the mode gear 115 via the gear train 112, the change of the cam groove 115a due to the rotation of the mode gear 115 causes the pin 121 to move, and the movement of the pin 121 causes the swing lever to move. 118 swings around the rotating shaft 122. The rack 119 is moved in the lateral direction X by the movement of the pin 123 based on the swing of the swing lever 118.
The movement of 9 rotates the pinion 120. As a result, the pickup support chassis 18 is rotated by the rotary shafts 18a, 1
The pickup 8 is turned around 8b, and the pickup 8 is inverted in the same manner as described above through the operation of the rack 119 and the pinion 120.

As described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, an example using five optical disks 1 was explained, but the number of optical disks 1 is four. The number of sheets may be less than or equal to 6 or more than 6. Furthermore, an example in which five optical disks 1 are fixed to one rotation shaft 4 and rotated by one spindle motor 2 has been described, but each optical disk 1 is individually provided with a spindle motor. It can also be configured to rotate.

Further, in the above embodiment, an example in which a rack and pinion mechanism is applied as a moving system in the radial direction of the disk has been described, but the invention is not limited to this, and for example, a screw screw feeding mechanism, a wire / Various mechanisms such as a belt feeding mechanism can be applied. Furthermore, an example using a vertical movement mechanism using a cam was explained as a method of moving between disks.
Of course, well-known methods such as the AND and pinion method and the wire belt drive method can be applied.

Furthermore, in the above-mentioned embodiment, an example in which it is applied to a read-only optical disk device has been described.
It can be applied to all disk recording / reproducing devices such as a magnetic field modulation type magneto-optical disk device and a light intensity modulation type magneto-optical disk device which record and / or reproduce on a disk having a plurality of surfaces by using an optical pickup. As described above, the present invention can be variously modified without departing from the spirit thereof.

[0077]

As described above, according to the present invention,
After the optical pickup is mounted on the slide chassis and the pickup reversing drive mechanism is provided, after the optical pickup mounted on the slide chassis records and / or reproduces information on one disc surface. The optical pickup can be inverted by operating the pickup inversion driving mechanism at that position, and information can be continuously recorded and / or reproduced on the two disk surfaces located above and below the optical pickup. . Moreover, the size of the pickup supporting chassis, which is the reversing portion, can be made as small as possible, the space required for reversing can be reduced, and the optical pickup can be operated at high speed at any position regardless of the position of the optical pickup. The effect of providing a disk recording / reproducing device that can be reversed by the above method is obtained.

By providing the pickup reversing drive mechanism on the slide chassis, it is possible to reduce the weight of the reversing portion, and thus it is possible to easily and quickly reverse the optical pickup.

Further, the pickup reversing drive mechanism is constituted by a bevel gear, a mode gear, a gear train and a motor, the rotational force of the motor is transmitted to the mode gear through the gear train, and the bevel gear portion picks up the bevel gear through the bevel gear. By rotating the support chassis, it is possible to provide a disc recording / reproducing apparatus which has a simple structure and can reliably reverse the optical pickup.

Further, the pickup reversing drive mechanism is composed of a pinion, a rack, a rocking lever, a mode gear, a gear train and a motor, and the rotational force of the motor is transmitted to the rocking lever via the gear train and the mode gear. By advancing and retracting the rack by the swing, the pickup supporting chassis can be rotated via the pinion, and it is possible to provide a disc recording / reproducing apparatus that can reliably reverse the optical pickup with a simple structure. The effect that it can be obtained.

Furthermore, the motor of the pickup inversion drive mechanism is also used as the motor for skew servo, whereby the number of motors used can be reduced, the number of parts can be reduced, and the cost can be reduced. An effect that the configuration can be simplified can be obtained.

Further, by locking the pickup supporting chassis with the lock mechanism, the optical pickup can be locked and held at a predetermined position, and the disc recording / reproducing apparatus with high recording / reproducing accuracy can be provided. can get.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a disc recording / reproducing apparatus of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a bottom view showing a main part of a slide chassis according to the disc recording / reproducing apparatus of the present invention.

FIG. 4 is a side view showing a partial cross section with the bottom surface of FIG. 3 facing upward.

FIG. 5 shows a pickup support chassis 1 in FIG.
It is a bottom view showing the state rotated by 80 degrees.

FIG. 6 is a view for explaining the operation of the pickup lock mechanism according to the disc recording / reproducing apparatus of the present invention, and is an explanatory view showing a state in which the lock pin reaches the tip of the cam portion.

FIG. 7 is an explanatory view showing a state in which the lock pin has passed over the cam portion.

FIG. 8 is a front view showing a gear with cam according to the disc recording / reproducing apparatus of the present invention.

FIG. 9 is a plan view of the same.

FIG. 10 shows a pinion releasing mechanism according to the disc recording / reproducing apparatus of the present invention, and is an explanatory view showing a state in which the pinion is engaged with the rack.

FIG. 11 is an explanatory diagram showing a state in which the pinion is released from the rack.

FIG. 12 is an explanatory view showing an elevator chassis according to the disc recording / reproducing apparatus of the present invention in a section in the longitudinal direction.

FIG. 13 is an explanatory view showing the elevator chassis in a section of the sub guide shaft.

FIG. 14 is a plan view showing a second embodiment of the slide chassis according to the disc recording / reproducing apparatus of the present invention.

FIG. 15 is a plan view showing a third embodiment of the slide chassis according to the disc recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 1 Optical Disc 6 Main Chassis 8 Optical Pickup 9 Slide Chassis 18 Pickup Support Chassis 20, 90, 110 Pickup Inversion Drive Mechanism 21 Mode Motor 22 Mode Gear Train 23 Mode Gear 24 Bevel Gear 32 Lock Member 33 Lock Pin 34 Lock Spring 54,116 Cam-equipped gear 91,111 Drive motor 95,115 Mode gear 97,117 Cam pin 118 Rocking arm 119 Rack 120 Pinion

Claims (6)

[Claims] 1. A slide chassis is moved in a radial direction of a disc, and information is recorded and / or recorded on a plurality of disc surfaces by an optical pickup mounted on the slide chassis.
Alternatively, in a disc recording / reproducing apparatus adapted to perform reproduction, a pickup reversing drive mechanism for reversibly supporting the optical pickup on the slide chassis and reversing the optical pickup on the slide chassis is provided. Disc recording / reproducing device. 2. The disc recording / reproducing apparatus according to claim 1, wherein the pickup reversing drive mechanism is provided on the slide chassis. 3. The disc recording / reproducing apparatus according to claim 1, wherein the pickup reversing drive mechanism is capable of intermittently meshing with a bevel gear fixed to a pickup supporting chassis to which the optical pickup is attached. A disc recording / reproducing apparatus comprising: a mode gear having a large bevel tooth portion and rotatably supported by the slide chassis; and a motor that rotationally drives the mode gear via a gear train. 4. The disc recording / reproducing apparatus according to claim 1, wherein the pickup reversing drive mechanism includes a pinion fixed to a pickup supporting chassis to which the optical pickup is attached, and a rack that meshes with the pinion. A swing lever for moving the rack forward and backward, a mode gear rotatably supported by the slide chassis and having a cam groove for swinging the swing lever, and a motor for rotationally driving the mode gear via a gear train. A disc recording / reproducing apparatus comprising: 5. The disk recording / reproducing apparatus according to claim 3, wherein the motor of the pickup inversion drive mechanism also serves as a motor for skew servo. 6. The disc recording / reproducing apparatus according to claim 1, further comprising a pickup lock mechanism for locking the pickup supporting chassis at a forward / reverse position.