JP3865205B2 - Recording medium driving device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a recording medium driving device, and more particularly to a mechanism for conveying a recording medium to a predetermined position while holding the recording medium.
[0002]
[Prior art]
Conventionally, when an optical disk such as a CD or DVD is inserted into an insertion slot, the optical disk has a loading mechanism that is housed in the apparatus and transported to a recording / reproducing position, and the optical disk is ejected outside the apparatus when recording / reproducing is completed. Equipment has been developed.
[0003]
As such a loading mechanism, a “roller type” in which the thickness direction of the optical disc is sandwiched by a wide rubber roller and conveyed, and an outer periphery of the optical disc is pushed by a resin roller provided on the arm by rotating or moving the arm. The “arm type” is known.
[0004]
In the former method, since rubber is usually used, deterioration and cracking due to changes in temperature and humidity and changes with time are likely to occur, and there is a problem in durability because the optical disk may slide. In addition, since the roller contacts the data surface of the disk, there is a problem that dust and dirt are caught and scratched.
[0005]
On the other hand, in the latter method, since the resin roller is brought into contact with the outer periphery of the optical disk and transported, the influence of change with time is small, and the data surface is not damaged.
[0006]
[Problems to be solved by the invention]
However, the “arm” type is not affected by the thickness of the optical disc because it does not clamp the optical disc as in the roller type, and only the resin roller that pushes the outer periphery of the optical disc is loaded while maintaining the parallel posture with the turntable. It was difficult, and it was necessary to provide an optical disk guide other than the resin roller. Hereinafter, this point will be described.
[0007]
The thickness of the 12 cm optical disk is defined as 1.2 mm + 0.2 / −0.1 mm (t = 1.1 mm to 1.4 mm) for DVD, but non-standard 1.0 mm and 1.5 mm thick optical disks are also available. At present, the groove width of the arm type roller has to be set to be large so as to correspond to these optical disks.
[0008]
FIG. 8 shows a configuration of a roller in a conventional arm type. A receiving arm 50 for transporting the optical disk from the insertion position to the recording / reproducing position and a discharge arm 52 for discharging the optical disk to the outside of the apparatus are provided, and resin rollers 51 and 53 are formed at the tips of the respective arms. At the time of storage, the storage arm 50 rotates to bring the roller 51 into contact with the outer periphery of the optical disk 100, and the optical disk is pushed and conveyed to the clamp position on the turntable 60. At this time, even if the thickness of the optical disc 100 is 1.5 mm outside the standard, the groove width of the roller 51 needs to be set to 1.5 mm or more so as to correspond to this. The same applies to the roller 53 formed on the discharge arm 52.
[0009]
However, when the groove widths of the rollers 51 and 53 are set so as to be compatible with a 1.5 mm thick optical disk, when the 1.0 mm thin optical disk 100 is accommodated or ejected, “play” is formed between the optical disk 100 and the groove. ”Occurs, and the attitude of the optical disc 100 collapses as shown in FIG. 9. For this reason, it becomes necessary to provide a separate guide to maintain the posture of the optical disc 100.
[0010]
As shown in FIG. 10, it is possible to stabilize the posture of the optical disc 100 by making the grooves of the rollers 51 and 53 “V” -shaped instead of “U” -shaped grooves. Is affected by the size of the outer circumference of the optical disc 100, causing a deviation in the circumferential direction, resulting in a deviation in the final transport position, which makes it difficult to clamp the turntable 60. There is also a problem that a difference in the horizontal level of the lower surface of the optical disc 100 occurs due to the shift, making it difficult to determine the reference.
[0011]
The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an apparatus capable of transporting a recording medium such as an optical disk in a stable posture.
[0012]
In order to achieve the above object, the present invention provides a moving means that moves along a predetermined trajectory, and a holding means that is formed in the moving means and that conveys the recording medium to a predetermined position as the moving means moves. The moving means has one end pivotally supported and the other end formed with the holding means, and is rotated around an axis to move the holding means to the outer periphery of the recording medium. An arm that conveys the recording medium by abutting and pressing, and the holding unit abuts on either the lower surface or the upper surface of the recording medium, and a fixed portion having a taper formed on the abutting surface; A movable part provided movably in the thickness direction of the recording medium with respect to the fixed part, and is urged by an elastic force toward the fixed part, and a taper is formed on the contact surface. The elasticity when pressed against the outer periphery of the Have a, a movable portion sandwiching the recording medium between said fixed portion by moving in a direction away from the fixing part against the fixed part, the upper surface or lower surface of the recording medium A bearing surface that abuts and defines the height of the recording medium, a convex that abuts the side surface of the recording medium and defines a circumferential position of the recording medium, and a flash of the recording medium formed at the back of the seating surface And a recess that absorbs water .
[0016]
In the present apparatus, the recording medium can be, for example, an optical disk.
[0018]
As described above, in the recording medium driving device of the present invention, the roller formed on the moving means such as the arm is not pushed into contact with the recording medium such as the optical disc as in the conventional case, but the recording is performed by the fixed portion and the movable portion. The medium is sandwiched and conveyed. The movable part is movable in the thickness direction of the recording medium, and even when the thickness of the recording medium varies, the movable part can be held between the fixed part and the movable part to keep the posture of the recording medium constant. At this time, the recording medium can be clamped more reliably by biasing the movable portion toward the fixed portion.
[0019]
When the recording medium is sandwiched, a taper is formed on the contact surface of the fixed portion with the recording medium, thereby reducing the contact area and protecting the data surface of the recording medium.
[0020]
Further, when the recording medium is sandwiched between the fixed part and the movable part, the movable part moves in accordance with the thickness of the recording medium, so that the moving amount of the movable part directly reflects the thickness of the recording medium. Therefore, the thickness of the recording medium can be evaluated by detecting the amount of movement of the movable part. When an optical disk such as a CD or DVD is used as a recording medium, the thickness of the optical disk can be evaluated from the amount of movement of the movable part, and it can be determined whether the thickness is within the standard.
Further, even if there is a “burr” on the side surface of the recording medium, it is absorbed by the concave portion, so that it is possible to prevent the displacement in the circumferential direction.
[0021]
<First Embodiment>
FIG. 1 shows a plan view of the optical disc apparatus according to the present embodiment. Three arms of a receiving arm 10, a discharge arm 12 and a sub arm 14 are pivotally supported on the base of the optical disk apparatus, and each of them rotates along a predetermined track. Rollers 11, 13, and 15 are formed at the ends of the three arms 10, 12, and 14, respectively, and the rollers 11, 13, and 15 are brought into contact with the outer periphery of the optical disc 100 as the shaft rotates. The outer periphery is pushed and stored and discharged. That is, when the optical disc 100 is accommodated, while holding the optical disc 100 with the rollers 11, 13, and 15, the arm 10 is rotated in the direction of A in the figure, and the arm 14 is rotated in the direction of A in the figure to show the optical disc 100. Push in the middle up direction. Further, when the optical disk 100 is ejected, the arm 12 is rotated in the direction C in the figure, and the optical disk 100 is pushed downward in the figure to be ejected outside the apparatus. Each arm 10, 12, 14 is biased in the direction of the optical disk 100 by a coil spring (not shown), and holds the outer peripheral portion of the optical disk 100 by the elastic force of the coil spring.
[0022]
FIG. 2 shows a roller 11 formed at the end of the receiving arm 10. The roller 11 includes a reference roller 11 a that is fixedly suspended at an end of the arm 10, and a movable roller 11 b that faces the reference roller 11 a and is urged toward the reference roller 11 a by a leaf spring 20. The elastic force of the leaf spring 20 is weaker than that of the coil spring, and the movable roller 11b can move against the elastic force of the leaf spring 20 in the direction of the arrow in the drawing, that is, in the thickness direction of the optical disc 100.
[0023]
In such a configuration, when the optical disc 100 having a thickness within the standard is inserted, the roller 11 comes into contact with the outer periphery of the optical disc 100 by the rotation of the arm 10, and both the reference roller 11a and the movable roller 11b come into contact. Since both the reference roller 11a and the movable roller 11b are urged toward the outer periphery of the optical disk 100 by a coil spring, the movable roller 11b moves upward in the figure against the elastic force of the leaf spring 20, and the optical disk 100 is moved to the reference roller 11a. And the movable roller 11b. The data surface (recording surface) of the optical disc 100 can be held by the reference roller 11a and the label surface can be held by the movable roller 11b.
[0024]
When an optical disc 100 thinner than the standard, for example, an optical disc 100 having a thickness of 1.0 mm is inserted, the movable roller 11b moves by an amount corresponding to the thickness of the optical disc 100 as shown in FIG. Similarly, the optical disk 100 can be held. Further, even when an optical disc 100 thicker than the standard, for example, an optical disc 100 having a thickness of 1.5 mm is inserted, the movable roller 11b moves upward according to the thickness, and the optical disc 100 is moved by the reference roller 11a and the movable roller 11b. Can be pinched. The roller groove is not brought into contact with the outer periphery of the optical disc 100 as in the prior art, but the thickness of the optical disc 100 is not affected by sandwiching the outer periphery of the optical disc 100 between the reference roller 11a and the movable roller 11b. And the attitude | position of the optical disk 100 can be accommodated and maintained parallel to a turntable.
[0025]
FIG. 3 shows details of the reference roller 11 a constituting the roller 11. As shown in (a), a seating surface 11a1 is formed in the groove portion of the reference roller 11a, and the data surface of the optical disc 100 comes into contact with the seating surface 11a1 to define the height position of the optical disc 100. That is, the seating surface 11 a 1 is a reference in the height direction of the optical disc 100. A convex portion 11a2 with which the side surface of the optical disc 100 abuts is formed on the upper portion of the seating surface 11a1, and the circumferential position of the optical disc 100 is defined by the convex portion 11a2. By reducing the width of the convex portion 11a2 and reducing the contact portion with the optical disc 100, it is possible to cope with a case where the side portion of the optical disc 100 is tapered. Further, a recess (or U-shaped groove) 11a3 is formed in the back of the seating surface 11a1, and the recess 11a3 can cope with variations in the side surface of the optical disc 100. This will be further described later.
[0026]
(B) is an enlarged view of a reference numeral 50 portion of the reference roller 11a, and the seating surface 11a1 is tapered so as to form a constant angle θ toward the inner diameter direction of the optical disc 100. For example, θ can be set to 2 to 3 °, and by forming a taper, contact with the data surface of the optical disc 100 can be minimized.
[0027]
FIG. 4 shows the relationship between the roller 11 and the optical disc 100 when the optical disc 100 having a “burr” on the side surface is inserted. As described above, the optical disk 100 is sandwiched between the reference roller 11a and the movable roller 11b. More specifically, the data surface of the optical disk contacts the seat surface 11a1 of the reference roller 11a, and the label surface contacts the groove of the movable roller 11b. Although the concave portion 11a3 is formed in the back of the seating surface 11a1, the “flash” portion 100a of the optical disc 100 is absorbed by the concave portion 11a3 and is caused by the “flash”. A shift in the circumferential position can be prevented.
[0028]
FIG. 5 shows the relationship between the roller 11 and the optical disc 100 when the optical disc 100 having a curvature at the corner (the corner is round) is inserted. Even if the corner portion has a curvature, the seating surface 11a1 abuts against the data surface of the optical disc 100 and is held from below, and the movable roller 11b abuts against the label surface of the optical disc 100 and presses it from above. The posture can be securely held and maintained in parallel with the turntable 60.
[0029]
FIG. 6 shows the relationship between the roller 11 and the optical disc 100 when an optical disc 100 in which two discs such as a DVD are bonded and the optical disc 100 is shifted vertically and has a step is inserted. Also in this case, the data surface of the optical disc 100 is held by the seating surface 11a1 of the reference roller 11a, and the label surface is held by the movable roller 11b moved according to the thickness of the optical disc 100, and is sandwiched from above and below. The optical disc 100 can be accommodated while being maintained in parallel without being affected.
[0030]
2 to 6, the roller 11 formed on the receiving arm 10 has been described, but the roller 13 formed on the discharge arm 12 or the roller 15 formed on the sub arm 14 is also moved up and down by the reference roller and the movable roller. It can be set as the structure clamped from.
[0031]
Second Embodiment
FIG. 7 shows the configuration of the arm 10 in the present embodiment. As in the first embodiment, a roller 11 is formed on the arm 10, and the roller 11 is composed of a reference roller 11a and a movable roller 11b. A proximity sensor 30 is provided to face the energizing leaf spring 20. The proximity sensor 30 is a sensor that detects the proximity of the leaf spring 20. When the optical disc 100 is not inserted, the proximity spring 30 is separated from the arm 10 by a predetermined distance and is in an OFF state. When 100 is inserted, the movable roller 11b moves against the elastic force of the leaf spring 20, and the leaf spring 20 is bent and approaches the arm 10, so that the ON state is established. Therefore, by monitoring the signal from the proximity sensor 30, it can be detected whether or not the optical disc 100 is inserted.
[0032]
Further, the ON / OFF operation distance of the proximity sensor 30 is adjusted, and the ON state is set at the approach distance L1 when the optical disc 100 having the thickness within the standard is inserted, and the OFF state is set when the distance exceeds L1. By adjusting in this way, when the optical disc 100 thinner than the standard is inserted, the abnormality of the optical disc 100 can be detected based on the proximity sensor 30 remaining in the OFF state.
[0033]
Further, by adjusting the ON / OFF operation distance of the proximity sensor 30 and adjusting it so as to be in the ON state at the approach distance L2 when the optical disc 100 having a thickness equal to or greater than the standard is inserted, for example, a thickness of 1.5 mm It is also possible to detect that the optical disc 100 is inserted.
[0034]
In FIG. 7, the proximity sensor 30 is provided on the arm 10 and the thickness of the optical disk 100 is evaluated based on the approach distance of the leaf spring 20. However, any sensor that detects the moving distance of the movable roller 11 b is used. Can do.
[0035]
Although FIG. 7 shows the arm 10, the proximity sensor 30 can be similarly provided to the other discharge arm 12 or the sub arm 14, and the proximity sensor 30 is provided to all the arms 10, 12, and 14. In other words, the presence / absence of insertion of the optical disc 100 or the thickness of the optical disc 100 can be evaluated by calculating an AND of signals from the respective sensors.
[0037]
【The invention's effect】
As described above, according to the present invention, a recording medium such as an optical disk can be reliably conveyed.
[0038]
In particular, when an optical disk is transported, it can be accommodated in the apparatus or discharged out of the apparatus while maintaining a constant posture without being affected by variations in thickness and “burrs” on the side surfaces .
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an arm arrangement in an embodiment.
FIG. 2 is a configuration diagram of a roller.
FIG. 3 is a configuration diagram of a reference roller.
FIG. 4 is an explanatory diagram of a roller when an optical disk with a beam is inserted.
FIG. 5 is an explanatory diagram of a roller when an optical disc having a curvature at a corner is inserted.
FIG. 6 is an explanatory diagram of rollers when inserting a DVD disc with a step.
FIG. 7 is an explanatory diagram of arrangement of proximity sensors in another embodiment.
FIG. 8 is an explanatory view of a conventional roller.
FIG. 9 is an explanatory view of a conventional roller.
FIG. 10 is an explanatory diagram of a conventional V-groove roller.
[Explanation of symbols]
10 receiving arm, 11 roller, 11a reference roller, 11b movable roller, 12 discharge arm, 13 roller, 14 sub-arm, 15 roller, 20 leaf spring, 30 proximity sensor.

Claims (1)

Moving means for moving along a predetermined trajectory;
A holding unit that is formed in the moving unit and conveys the recording medium to a predetermined position while holding the recording medium as the moving unit moves;
A recording medium driving device comprising:
The moving means is
One end is pivotally supported and the other end is formed with the holding means, and includes an arm that rotates around an axis and conveys the recording medium by pressing the holding means against the outer periphery of the recording medium,
The holding means is
A fixed portion that is in contact with either the lower surface or the upper surface of the recording medium and has a taper formed on the contact surface;
A movable part provided movably in the thickness direction of the recording medium with respect to the fixed part, and is urged by an elastic force toward the fixed part, and a taper is formed on the contact surface. A movable part that sandwiches the recording medium with the fixed part by moving in a direction away from the fixed part against the elastic force when pressed against the outer periphery of
I have a,
The fixing part is
A seating surface that abuts the upper surface or the lower surface of the recording medium and defines the height of the recording medium;
A convex portion that abuts against a side surface of the recording medium and defines a circumferential position of the recording medium;
A recess formed at the back of the seating surface to absorb the flash of the recording medium;
A recording medium driving device comprising:

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