JPH0253865B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to an optical information recording and reproducing device that records and reproduces information using laser light. [Technical background of the invention and its problems] For several years now, in the audio and video fields, information has been transmitted by irradiating a recording disk (hereinafter referred to as a disk) with a laser beam and converting it into a signal as a change in the amount of returned light due to bit diffraction. Optical video discs have been introduced to play. The mainstream of playback devices is a front loading method in which disks are loaded and unloaded from the front of the playback device for ease of operation and efficient use of space. Hereinafter, a loading mechanism of a conventional optical disc front-loading type reproducing apparatus will be described with reference to the accompanying drawings FIGS. 16 to 21. FIG. 17 shows a state in which the slide table 2 for loading and unloading a disc is pulled out from the front of the playback device, and FIG. 16 shows a state in which it is closed. In FIG. 18, the slide table 2 includes:
A lifting plate 3 on which a disk 1 is placed and which can be moved up and down is inscribed therein. A turntable 5 is attached to the motor 4. The turntable 5 rotates as the motor 4 rotates, and on which the disc 1 is placed and rotated together during a playback operation. Furthermore, a center spindle 6 for positioning the center of the disk 1 is also attached to rotate together with the turntable 5. The disk clamper 7 is rotatably attached to a center stay 10 fixed to an arm 8 so as to cross both sides of the playback device, and is moved up and down by a support arm 8 rotating around a fulcrum 9 to hold the disk 1. It serves to hold it down on the turntable 5. In the above configuration, in order to load the disks, first, as shown in FIG. Place the disk. Next, as shown in FIG. 19, slide table 2 is pushed in and closed. In this state, the disk 1 is still placed on the elevating plate 3. Then, as shown in FIG. 20, the elevating plate 3 is lowered to a position lower than the turntable 5. As a result, the disc 1 is placed on the turntable 5. Thereafter, the arm 8 rotates downward of the apparatus using the pin 9 as a fulcrum, and the disk clamper 7 presses down the disk 1 placed on the turntable 5. Therefore, the disk 1 is held between the turntable 5 and the disk clamper 7, and loading is completed. When unloading, operate in the opposite manner to the above.
That is, the arm 8 rotates upward about the pin 9, and the disk clamper 7 rises. Next, the elevating plate 3 is raised, and the disk 1 placed on the turntable 5 is lifted up and placed on the elevating plate 3. After the elevating plate 3 rises to a predetermined position on the slide table 2, the slide table 2 is pulled out and the disk 1 is taken out. In addition, the 18th
20, the mechanism for raising and lowering the elevating plate 3 and the disk clamper 7, respectively, is not shown. In the conventional structure described above, since the disk clamper 7 must be lowered to clamp the disk 1, a mechanism for moving the disk clamper 7 up and down is required. Furthermore, it is necessary to incorporate a mechanism for vertically moving the elevating plate 3, which requires a large number of parts and hinders miniaturization of the device. Further, although not shown in the drawings, the number of parts increases because the disk loading drive and the pick up head feeding drive are performed by separate motors. Furthermore, the slide table 2 and the elevating plate 3 are constructed as separate pieces, and in order for the elevating plate 3 to move up and down with respect to the slide table 2, the slide table 2 has a hole through which the elevating plate 3 passes. It is provided. However, since the slide table 2 is frequently put in and taken out by hand, it must not be easily damaged, considering the case where force is accidentally applied in the vertical direction. Therefore, it has a separate piece structure from the elevating plate 3, has the above-mentioned large hole, and has the disadvantage that it must be made thick in order to prevent it from cracking. [Object of the invention] The present invention has been made in view of the above circumstances, and
It is an object of the present invention to provide an optical information recording and reproducing device that has fewer parts than conventional reproducing devices, has a simpler loading mechanism, and is smaller, lighter, and thinner. [Summary of the Invention] In order to achieve the above object, the present invention includes a main chassis, a sub-chassis supported by the main chassis so as to be movable up and down with respect to the main chassis, and a sub-chassis mounted on the sub-chassis,
A turntable that is rotationally driven by a turntable motor, a slide table that transports the recording disk placed on it to a position that coincides with the rotation center of the turntable, and a slide table that is used to record information on the recording disk or read information from the recording disk. a disc clamper that clamps the recording disc between the optical head of the disc, a turntable that is rotatably attached to the main chassis, and a motor that serves both to drive and unload the recording disc and to drive the optical head; The first converts the rotational driving force of the motor into the linear reciprocating driving force of the optical head and moves the optical head in the radial direction of the recording disk.
a second operating means that converts the rotational driving force of the motor into a driving force for raising and lowering the sub-chassis to move the sub-chassis up and down, and the first and second converting means respectively operate the sub-chassis and the optical head. Provided is an optical information recording/reproducing device characterized by comprising: a switching means for switching so that one operation is completed and the other operation is started when the other operation is performed. [Embodiments of the Invention] Examples of the present invention will be described below with reference to the drawings. In FIG. 1, the sub chassis 14 is rotatably attached to the main chassis 13 at two points at one end by pins 15a and 15b. The sub-chassis 14 also has a turntable motor 21 equipped with a turntable 22 for rotating a disk, and a carriage 16 that incorporates a pick-up head 23 for reading and reproducing signals and moves in the radial direction of the disk. It is being The reciprocating mechanism 20 includes a carriage 16, a rack 17, and a spring 29, which will be described later. Unlike the conventional slide table 12, the portion on which the disk is placed does not move up and down and is integrally formed. Above the turntable 22, a disk clamper 27 is attached to a center stay 28 fixed to the main chassis 13 so that it can rotate together with the disk during playback operation. A motor 30 serves both as a disk loading drive and a pick up head feeding drive.
The rotation of is decelerated by a deceleration mechanism 50 composed of a small pulley 31, a large pulley 32, a belt 33, a first gear 34, a second gear 35, a third gear 36, and a fourth gear 37, The rotation is transmitted to the pinion 38 which always remains in mesh with the rack 17. These reduction gears 34, 35, 36, 37 and pulley 3
1 and 32 are assembled into a bracket 39 and fixed to the subchassis 14. Here, the motor 30 may be attached to the sub chassis 14 together with the speed reduction mechanism 50, or may be attached to the main chassis 13. The belt 33 stretched between the motor 30 and the pulley 32 is relatively flexible,
The sub-chassis 14 rotates by a small angle and the motor 30 and the sub-chassis 1 are attached to the chassis side.
Even if the relative position of the pulley 32 on the 4th side changes slightly, the rotation transmission function is not affected in any way. In order to rotate the sub-chassis 14 and move it up and down, a crankshaft is rotatably held in a bracket 45 fixed to the main chassis 13 in a slit hole 40 formed in a transmission member 24 provided at the front end of the sub-chassis 14. L at one end of 41
A shaped crank arm 42 is engaged. A rod-shaped crank arm 43 at the other end of the crankshaft 41 is in a position where it comes into contact with the head 44 of the rack 17 during loading and unloading of the disk. Although not shown in FIG. 1, the sub-chassis 14 is always urged by a spring 46 so that the turntable 22 rotates in the upward direction. (See spring 46 in Figures 3 and 4)
Further, the push pack mechanism 51 for pushing out the slide table 12 is constructed as follows. That is, the push-back lever 53 to which the roller 56 is rotatably attached is attached to the support pin 54.
It is rotatably attached to the rear of the main chassis 13 by a spring 55, and one end is always pulled in a direction to push out the slide table 12 by a spring 55. Therefore, when the locking mechanism (not shown) that locks the slide table 12 is released, the slide table 12 is pushed out by this pushback mechanism 51 and pulled out by several centimeters, so it can be grasped by hand. It can be pulled out. In FIG. 3, a bracket 45 is fixed to the main chassis 13;
5, a crankshaft 41 is rotatably held. In the recording disk reproducing apparatus constructed as described above, in a normal rest state, the sub-chassis 14 rotates as shown in FIG. 4, the turntable 22 is in the raised position, and the disk 18 is in a state in which there is no disk. Next, the loading, unloading, and reproducing operations of the optical information recording/reproducing apparatus of the present invention will be explained using FIGS. 3 to 10. FIG. 3 shows an unloading state in which the sub-chassis 14 is lowered, and FIG. 4 shows a completed loading state in which the sub-chassis 14 is raised.
5 to 7 are conceptual diagrams for explaining the operation according to the present invention. In particular, Fig. 5 shows the unloading state, Fig. 6 shows the loading state, and Fig. 7 shows the loading state.
The figure shows the playback state. Further, FIG. 8 shows an operation flowchart related to loading, FIG. 9 shows an operation flowchart related to unloading, and FIG. 10 shows an operation flowchart related to regeneration. The symbols used in the conceptual diagrams of FIGS. 5 to 7 and their meanings are summarized in the following table.

[Other embodiments of the invention]

In FIG. 11, the sub chassis 1 in FIG.
As a modification of the slit hole 40 of the transmission member 24 provided at the tip of the transmission member 4, an inclined cam 60 is provided. L-shaped crank arm 42 of crankshaft 41
is in a position where it contacts the inclined cam 60. 12th
The figure and FIG. 13 illustrate these operations. In the drawings, the same or corresponding parts as in FIGS. 3 and 4 are designated by the same reference numerals, and their explanations will be omitted. As shown in Fig. 12, the crank arm 43 is
7, the L-shaped crank arm 42 of the crankshaft 41 rotates while pushing the curved slope 60' of the inclined cam 60, so that the sub-chassis 14 rotates and descends. Next, when the slide table 12 is closed as shown in FIG. The L-shaped crank arm 42 moves downward along the curved slope 60' of the inclined cam 60, and the sub-chassis 14 rises. At this time, if the L-shaped crank arm 42 of the crankshaft 41 has a roller structure, smoother operation can be obtained. Furthermore, in FIG. 14, a rocker 61 is provided on the inclined cam 60. Rotscar 61
When the sub chassis 14 is in the raised position,
This is to prevent it from falling. By providing this rocker 61, even if a force is applied to lower the sub-chassis 14 as shown in FIG. is maintained. Furthermore, even if vertical vibration or impact is applied to the L-shaped crank arm 42 of the crankshaft 41, the point of application of this force and the direction of the force will be relative to the pivot point 41' of the crankshaft 41. crankshaft 4
The shapes of the crank arms 42 and 43 and the shape of the inclined cam 60 are adjusted so as not to generate a rotational moment that would cause the regenerator main body 11 to rotate from the rear to the front.
Because of the designed arrangement, the sub-chassis 14 is prevented from rotating in the downward direction. By using such a mechanism, disk 1
After disc 8 starts rotating, strong vibrations and shocks are applied in the vertical direction, and even if a force is applied to lower the sub chassis 14, the lowering is stopped and the rotating disc 1
8 can be prevented from coming into contact with the slide table 12 and causing damage or damage, and a safer and more reliable playback device can be realized. Furthermore, Rotscar 6
1 may be provided at both the lower end and the upper end of the inclined cam 60. Further, in the embodiment, the reciprocating mechanism 20 is composed of a carriage 16, a rack 17, and a spring 29, but this is because the motor 30 is used for both loading and unloading drives and pick up head feeding drives. . Therefore, if the reciprocating mechanism moves back and forth,
For example, only the rack 17 may be used, and the present invention is not limited to the above-mentioned example. In terms of applications, the embodiments mainly describe an optical video disc player, but the present invention has a wide range of applications as a recording/reproducing device for optical discs, CDs, etc. used for recording/reproducing various data. [Effects of the Invention] As described in detail above, the present invention has great effects in reducing the number of parts and making the optical information recording/reproducing device smaller, lighter, and thinner.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an embodiment of the optical information recording/reproducing apparatus of the present invention, FIG. 2 is a perspective view of the front part of the main chassis according to the present invention, and FIGS.
5 to 7 are conceptual diagrams for explaining the main operations of the present invention. FIGS. 8 to 10 are diagrams for explaining the main operations of the present invention. Operational flowchart to explain,
FIG. 11 is a perspective view of the front part of a subchassis according to another embodiment of the present invention, FIGS. 12 and 13 are illustrations of loading operation according to another embodiment of the present invention,
14 and 15 are perspective views and partial explanatory views of the front part of a subchassis according to another embodiment of the present invention, FIGS. 16 and 17 are external views of the conventional and present devices, and FIG. 18 20 are explanatory views of the operation of a conventional loading mechanism, and FIG. 21 is an explanatory perspective view of a conventional disk clamper portion. 12...Slide table, 13...Main chassis, 14...Sub chassis, 16...Carriage (first operating means), 17...Rack (first
(operating means), 19... reciprocating mechanism, 21...
Turntable motor, 22... Turntable, 24... Transmission member, 27... Disc clamper, 28... Center stay, 29... Spring (interlocking mechanism), 30... Motor, 40... Slit hole,
41...Crankshaft, 42...Crank arm, 43
... Crank arm, 48 ... Stopper (switching means), 60 ... Inclined cam (transmission member), 61 ... Rocker (positional deviation prevention means).

Claims (1)

[Scope of Claims] 1. A main chassis; a sub-chassis supported by the main chassis so as to be movable up and down with respect to the main chassis; a turntable placed on the sub-chassis and rotationally driven by a turntable motor; and the recorder. an optical head for recording information on or reading information from the recording disk; a disk clamper that is rotatably attached to the main chassis and clamps the recording disk between the turntable; A motor that doubles as a loading drive, an unloading drive, and an optical head feeding drive, and a rotational driving force of this motor is converted into a linear reciprocating driving force for the optical head to move the optical head in the radial direction of the recording disk. a first operating means for moving the sub-chassis up and down by converting the rotational driving force of the motor into a driving force for raising and lowering the sub-chassis, and a second operating means for moving the sub-chassis up and down by the first and second operating means; and a switching means for switching the optical head so that when one operation is completed, the other operation is started when performing each operation of the optical head. 2. The first operating means has a rack having an elongated hole and movable in the radial direction of the recording disk by rotation of the motor, and a protrusion on which the optical head is mounted and movable within the elongated hole. 2. The optical information recording and reproducing apparatus according to claim 1, further comprising: a carriage that interlocks with the rack within a predetermined operating range. 3. The second operating means converts linear reciprocating motion of a rack movable in the radial direction of the recording disk into rotational motion of the sub-chassis by rotation of the motor when loading and unloading the recording disk. 2. The optical information recording and reproducing apparatus according to claim 1, characterized in that the apparatus comprises a crank means that performs the following. 4. The switching means includes a stopper that defines a range of movement of the carriage; and after the range of movement of the carriage is regulated by the stopper, only the rack can be moved by the motor; 3. The optical information recording and reproducing apparatus according to claim 2, further comprising: an interlocking mechanism that enables interlocking of the rack and the carriage after the restriction on operation thereof is lifted. 5. The crank means includes a crankshaft rotatably attached to the main chassis, and is attached to one end of the crankshaft, and engages with the rack to rotate the crankshaft during loading and unloading. a first crank arm attached to the other end of the crankshaft; a second crank arm attached to the subchassis and configured to rotate the second crankshaft;
4. The optical information recording and reproducing apparatus according to claim 3, further comprising: a transmission member that transmits the rotational movement of the crank arm to the sub-chassis. 6. The optical information recording and reproducing apparatus according to claim 1, further comprising a displacement prevention means for restraining the position of the sub-chassis when loading is completed.