JPWO2006003938A1 - Shutter opening/closing mechanism and recording medium driving device - Google Patents

Abstract

  The shutter opener is provided with a driven body that is engaged with the shutter opener and is provided in the cartridge. The driven body has a wheel 13 that works in conjunction with a shutter that opens and closes a window portion. The wheel 13 has an outer periphery. A first concave portion, a gear portion, and a second concave portion 13C are formed along the portion, and the shutter opener has a first convex portion provided on the doorway side and engageable with the first concave portion, and a shutter opener provided on the depth side. The second convex portion 24 has a second convex portion 24 that can be engaged with the second concave portion 13C and a rack portion that meshes with the gear portion. The second convex portion 24 is urged toward the cartridge side, and the tip portion thereof. Is formed in a taper shape, and its tip position is arranged on the entrance/exit side with respect to the reference position MC which is the wheel center position.

Description

  The present invention relates to a shutter opening/closing mechanism for opening/closing a window in a cartridge whose approximate center is located at a reference position inside a housing, and a recording medium driving device including the shutter opening/closing mechanism.

  Conventionally, recording media such as CDs (Compact Discs) and MDs (Mini Discs) that can store a large amount of recording information have been used. Further, in recent years, DVD (Digital Versatile Disc) has been developed as a large-capacity recording medium, and so-called Blu-ray disc has been rapidly researched as a next-generation medium. In addition to a bare disk such as a CD, there are some recording media that are used by being housed in a cartridge to protect the recording surface.

A window portion is formed in the cartridge so as to face the information recording surface of the disc-shaped information recording medium, and the window portion is opened/closed by a shutter opening/closing mechanism.
A conventional structure of a shutter opening/closing mechanism is shown in Japanese Patent Application Laid-Open No. 2004-242242.
The shutter opening/closing mechanism of Patent Document 1 includes a shutter opener mounted inside an outer casing into which the cartridge is inserted from a doorway, and a driven body engaged with the shutter opener and provided in the cartridge.
The schematic structure of the shutter mechanism as viewed from the back surface of the cartridge 10 is shown in FIGS. In this figure, a driven body 11 provided in a cartridge 10 is provided with a wheel 13 which is rotatably arranged inside the cartridge 10 in conjunction with a shutter plate (not shown), and the wheel 13 has an outer peripheral portion. A gear portion 13A is formed along the gear portion 13A, and a concave portion 13B having an R-shaped outer shape and a concave portion 13C having a rectangular outer shape are formed at two positions on both sides of the gear portion 13A.

On the other hand, the shutter opener 200 provided in the housing is a rack 201 installed inside the housing (not shown) along the depth direction from the cartridge inlet/outlet, and a front side engagement member provided on the inlet/outlet side of the rack 201. 202 and a rear side engagement member 203 provided on the depth side of the rack 201. These engaging members 202 and 203 have their tips formed in a substantially arc shape, and the tips of the engaging members engage with recesses 13B and 13C formed in a wheel 13 of the cartridge 10 described later. The structure is
In the shutter mechanism having the above structure, when the cartridge 10 is inserted in the depth direction R, the front side engagement member 202 engages with the recess 13B, and in that state, when the cartridge 10 continues to advance in the depth direction A, the wheel When 13 rotates counterclockwise as indicated by arrow B, the rack 201 and the gear portion 11A mesh with each other, and the rear side engagement member 203 engages with the recess 13C, the shutter (not shown) is opened.

Japanese Patent Laid-Open No. 2003-109282

In Patent Document 1, the engaging members 202 and 203 each having a circular arc-shaped tip are engaged with the flat rectangular recesses 13B and 13C of the wheel. Usually, in order to smoothly engage the recesses 13B and 13C with the substantially arcuate tip ends of the engaging members 202 and 203, a gap is formed between them. If this gap (play) is large, the wheel 13 will rotate by this gap due to an external impact or the like.
Here, it is ideal that the center CC of the disc-shaped information recording medium (not shown) housed in the cartridge 10 coincides with the reference position MC of the housing, but these are actually caused by tolerance and play. May not match.

For example, as shown in FIG. 1(A), the center CC of the cartridge 10 may be displaced from the reference position MC to the front side (doorway side, the lower side of the paper in FIG. 1), and in this case, the wheel 13 is As an example, the problem that the shutter cannot be fully opened and the shutter is not fully opened occurs. In this state, a pickup device for reading information recorded on the disc-shaped information recording medium or recording information on the recording medium may interfere with the shutter.
On the other hand, as shown in FIG. 1B, the center CC of the cartridge 10 may deviate from the reference position MC toward the rear side (the depth side, the upper side in the drawing of FIG. 1). As an example, the side engaging member 203 is disengaged from the recess 13C, and the wheel 13 is mistakenly rotated by an external impact or the like.

  An object of the present invention is to provide a shutter opening/closing mechanism and a recording medium driving device that can properly open/close the shutter even if the center of the cartridge does not coincide with the reference position of the housing.

  A shutter opening/closing mechanism of the present invention is a shutter opening/closing mechanism that engages with a wheel provided inside a cartridge inserted from an entrance/exit to open/close a shutter provided in the cartridge, in a direction in which the cartridge is inserted. Rack portions that are formed along the gear portions and that engage with the gear portions formed on the wheel; A first convex portion and a second convex portion that respectively engage with the concave portion, and at least the second convex portion is urged toward the cartridge side, and the tip position of the second convex portion is at the time of completion of insertion. It is characterized in that it is arranged on the entrance/exit side with respect to the center position of the wheel.

  A recording medium driving device of the present invention is a recording medium driving device provided with the shutter opening/closing mechanism of the present invention described above, wherein information is recorded on a disc-shaped information recording medium housed in the cartridge inside the casing. And/or an information recording/reproducing mechanism for reproducing is attached.

Sectional drawing which shows a prior art. The perspective view which shows one Embodiment of this invention. FIG. The perspective view of a shutter opener. FIG. 6 is a plan view showing an essential part of the present embodiment and showing an engagement relationship between a second convex portion and a second concave portion of the wheel. Sectional drawing which shows the effect|action of a shutter opening/closing mechanism.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1... Recording medium drive device, 2... Housing, 2A... Entrance/exit, 10... Cartridge, 10B... Window part, 12... Disc-shaped information recording medium, 12B... Window part, 13... Wheel, 13A... Gear part, 13B... 1 recessed part, 13C... 2nd recessed part, 14... Shutter, 20... Shutter opener, 22... Rack part, 23... 1st convex part, 24... 2nd convex part

Hereinafter, embodiments of the present invention will be described together with illustrated examples.
FIG. 2 shows an overall configuration of a cartridge and a recording medium driving device to which the shutter opening/closing mechanism of this embodiment is applied.
In FIG. 2, the recording medium driving device 1 records information on a housing 2 and a disc-shaped information recording medium 12 (see FIG. 3) housed in a substantially flat-shaped cartridge 10 provided inside the housing 2. And/or an information recording/reproducing mechanism (not shown) for reproducing.
The information recording/reproducing mechanism rotates the disc-shaped information recording medium housed in the cartridge 10 by a rotation driving unit such as a turntable, while moving the optical pickup in the radial direction with respect to the disc-shaped information recording medium. This is a device for recording and/or reproducing video and audio.

On the front side of the housing 2, there is provided a rectangular inlet/outlet 2A for housing the cartridge 10 in the housing 2 or discharging the cartridge 10 from the inside. In this embodiment, the cartridge 10 may be directly housed in the housing 2, or may be housed in the housing 2 while being placed on a tray (not shown).
The cartridge 10 is arranged inside the housing 2 such that the center of the disc-shaped information recording medium 12 coincides with the reference position inside the housing 2. That is, the reference position is the center position of the rotation drive unit of the information recording/reproducing mechanism.
A shutter opener 20 as a driving body is attached to the inside of the housing 1 and extends in the depth direction from the doorway 2A.

The structure of the cartridge 10 is shown in FIG.
In FIG. 3, the cartridge 10 includes a lower cartridge main body 10A and an upper cartridge main body (not shown) each having an opening formed in a side portion.
The lower cartridge body 10A is formed with a window 10B extending in the radial direction for accessing the optical pickup.
A driven body 11 engaged with the shutter opener 20 and a disc-shaped information recording medium 12 rotatably supported are provided between these cartridge bodies.
As the disc-shaped information recording medium 12 in this case, specifically, CD-ROM (Compact Disc-Read Only Memory), CD-DA (CD-Digital Audio), CD-R (CD-Recordable), CD-RW ( CD-Rewritable), Video-CD, CD-G (CD-Extended Graphics), DVD-ROM (Digital Versatile Disc-ROM), DVD-Video, DVD-Audio, DVD-R, DVD-RW, Blu-ray. It includes Disc and the like.

The follower 11 includes a wheel 13 and a disc-shaped information recording medium 12 rotatably supported in the cartridge body, two shutters 14 arranged between the wheel 13 and the lower cartridge body 10A, and a wheel 13 And an interlocking mechanism (not shown) that interlocks the rotation of the shutter with the opening and closing of the shutter 14.
The window portion 10B of the lower cartridge body 10A exposes a part of the information recording surface of the disc-shaped information recording medium 12 when the shutter 14 is opened.
The wheel 13 includes a gear portion 13A formed along the outer peripheral portion thereof, a first concave portion 13B having an R-shaped outer shape on each side of the gear portion 13A, and a second concave portion 13C formed on a plane rectangle. The gear portion 13A, the first recess 13B, and the second recess 13C are exposed from the opening of the side surface of the cartridge body depending on the rotational position.
In the state where the shutter 14 is closed, the center of the first recess 13B is the center of the cartridge, the wheel 13 is positioned so as to substantially coincide with the reference position MC shown in FIG. 5, and the shutter 14 is fully opened. In the state, the wheel 13 is positioned so that the center of the second recess 13C is the center of the cartridge and substantially coincides with the reference position MC.

FIG. 4 shows the structure of the shutter opener 20.
4, the shutter opener 20 includes a substantially elongated base 21, a rack portion 22 provided along the longitudinal direction of the base 21 and capable of meshing with the gear portion 13A of the wheel 13, and the rack portion 22. And a second convex portion 24 as a second engaging member provided on the depth side of the rack portion 22. There is.
The base portion 21 is fixed to the inner side wall of the housing 2 by an appropriate means.
The tip end of the first protrusion 23 is engageable with the first recess 13B of the wheel 13, and a spring (not shown) is interposed between the base end and the base 21 of the first protrusion 23. Is urged towards.
The tip end portion of the first convex portion 23 is formed in a plane arc shape, and the width dimension thereof is slightly smaller than the width dimension of the first concave portion 13B.

FIG. 5 shows the planar shape of the second convex portion 24.
As shown in FIG. 5A, the tip end position P of the second convex portion 24 is arranged at a distance D from the reference position MC of the disc-shaped information recording medium 12 on the entrance/exit side F. The dimension D is appropriately set in consideration of rattling and tolerance of the cartridge when stored in the recording medium driving device. The tip end of the second protrusion 24 is engageable with the second recess 13C of the wheel 13, and a spring (not shown) is interposed between the base end and the base 21 of the cartridge. It is biased toward the side.
In addition, in this embodiment, the width dimension of the base end side of the second convex portion 24 is formed larger than the width dimension of the second concave portion 13C.
Further, at least the tip side of the second convex portion 24 is preferably formed in a taper shape. In FIG. 5A, the taper is formed from the tip to the entrance/exit side (F side) and the depth side (R side). And are formed toward the side of each. The tapered tip portions are each formed at an angle of about 45° with respect to the center line C passing through the tip. By thus forming the tapered shape, it is possible to stably secure the force for rotating the wheel.
In this state, one corner of the second concave portion 13C abuts the tapered surface of the second convex portion 24 on the entrance/exit side, but the other tapered portion of the second concave portion 13C contacts the tapered surface on the depth side of the second convex portion 24. The corners do not contact. The taper surface on the depth side is formed so as to be retractable by the taper surface when the second convex portion comes into contact with the housing of the cartridge during unloading of the cartridge. Therefore, as described above, the tapered surface on the depth side does not necessarily have to be formed, and if it is not necessary to consider the time of contact with the housing, the side surface on the inlet/outlet side may be tapered without providing it.

Next, the operation of the shutter opening/closing mechanism of this embodiment will be described based on FIG. FIG. 6 is a view seen from the same direction as FIG.
First, in the cartridge 10, the shutter 14 is closed in advance, and in this state, the first recess 13B is exposed from the side opening, and the first recess 13B is located at the center of the cartridge.
First, as shown in FIG. 6A, the cartridge 10 is pushed in the depth direction R from the entrance of the housing. Then, as shown in FIG. 6B, the first concave portion 13B of the wheel 13 and the first convex portion 23 of the shutter opener 20 are engaged with each other.

When the cartridge 10 is continuously pushed in the depth direction R in that state, the wheel 13 rotates counterclockwise to start opening the shutter 14 as shown in FIG. 6C, and further, the rack 22 and the gear portion 13A. Mesh with each other.
Further, when the cartridge 10 is conveyed in the depth direction R by a mechanism (not shown), the wheel 13 continues to rotate counterclockwise and the opening degree of the shutter 14 gradually increases, as shown in FIG. 6(D). When the second concave portion 13C of the wheel 13 and the second convex portion 24 of the shutter opener 20 engage with each other, the shutter 14 is maintained in the open state. In this state, in the cartridge 10, the disc-shaped information recording medium 12 is exposed from the window and is located at the reference position MC, and the information recording/reproducing mechanism can be operated.
On the contrary, when the cartridge 10 is conveyed to the entrance/exit side by a mechanism (not shown) after the operation of the information recording/reproducing mechanism is completed, the wheel 13 engaged with the shutter opener 20 rotates in the clockwise direction and the shutter 14 Is closed.

Here, the cartridge center CC and the reference position MC may not match due to tolerances or the like. For example, as shown in FIG. 5B, the cartridge center CC may be located on the depth side R from the reference position MC. In this case, the second convex portion 24 is displaced in the direction away from the wheel 13 against the biasing force to the cartridge side, and the contact portion with the second concave portion 13C is displaced toward the tip side, so that the second concave portion The engagement with 13C is maintained.
On the contrary, as shown in FIG. 5C, the cartridge center CC may be located closer to the entrance/exit side F than the reference position MC. In this case, since the second convex portion 24 is arranged on the entrance/exit side by the dimension D, the wheel can be rotated sufficiently and the shutter can be completely opened. Further, the engagement with the second recess 13C is maintained by the displacement in the direction approaching the wheel 13 and the displacement of the contact portion with the second recess 13C toward the base end side.

Therefore, according to this embodiment, the following effects can be obtained.
(1) The shutter opening/closing mechanism is a shutter opener 20 as a driving body that is attached by extending in the depth direction from the entrance/exit side inside the housing 2, and a driven body that is engaged with the shutter opener 20 and is provided in the cartridge 10. 11, the follower 11 has a wheel 13 that interlocks with a shutter 14 that opens and closes the window 10B. The wheel 13 extends along the outer periphery of the first recess 13B, the gear 13A, and the second recess 13B. A recess 13C is formed, and the shutter opener 20 is provided on the entrance/exit side and is engageable with the first recess 13B, and the shutter opener 20 is engageable with the second recess 13C provided on the depth side. It has the 2nd convex part 24 and the rack part 22 meshed with 13 A of gearwheels, and the 2nd convex part 24 is urged|biased toward the cartridge side, and the front-end|tip position is entrance/exit side with respect to the reference position MC. It is configured to be placed in. In addition, it is preferable that at least the inlet/outlet side in the vicinity of the tip portion is formed in a tapered shape. Therefore, even when the center CC of the cartridge and the reference position MC of the housing 2 do not coincide with each other, the second convex portion 24 is engaged with the second concave portion 13C by its tapered surface. Therefore, the engagement between the second convex portion 24 and the second concave portion 13C is maintained, and the shutter 14 is properly opened and closed.

(2) The taper portion formed from the tip to the entrance/exit side surface when the taper portion is formed from the tip to the entrance/exit side surface and the depth side surface, respectively. As a result, when the cartridge 10 is pushed into the housing 2 from the inlet/outlet 2A, the second concave portion 13C and the second convex portion 24 are more securely engaged with each other, and the taper portion formed from the tip toward the depth side surface. Thereby, when the cartridge 10 is pushed out to the entrance/exit 2A, the second concave portion 13C and the second convex portion 24 are more reliably engaged with each other. Further, since the depth side near the tip is tapered, even if the housing of the cartridge and the second protrusion contact each other during unloading of the cartridge, the sliding of the housing and the second protrusion can be facilitated. ..
Therefore, when the cartridge 10 is inserted or ejected by the both taper portions, the shutter opener 20 and the wheel 13 can be more surely engaged with each other, and the malfunction of the opening and closing of the shutter 14 can be suppressed.

(3) Since the taper portion of the second convex portion 24 is formed at a right angle with respect to the center line passing through the tip thereof at an angle of about 45°, the dimensional difference between the cartridge center CC and the reference position MC of the housing 2. Even when the value is large, the engagement between the second convex portion 24 and the second concave portion 13C can be maintained, and the force transmitted from the second convex portion 24 to the wheel 13 can be increased.
That is, if the taper portion of the second convex portion 24 is made to have a tip with a small angle, the force transmitted from the second convex portion 24 to the wheel 13 can be increased, but the cartridge center CC and the reference position MC of the housing 2 can be increased. When the dimensional difference is large, it is not possible to make a large change in the contact portion in the taper portion, and the second convex portion 24 is easily separated from the second concave portion 13C, and conversely, the taper portion of the second convex portion 24 has a large angle. When the tip of the second convex portion 24 does not come off from the second concave portion 13C even if the dimensional difference between the cartridge center CC and the reference position MC of the housing 2 is large, the second convex portion 24 does not move to the wheel 13. The transmitted force becomes smaller. Therefore, in order to achieve both effects at the same time, it is preferable to form the tapered portion with an angle of 45°.

(4) Since the second concave portion 13C of the wheel 13 is formed in a rectangular shape in plan view, the corner portion on the opening end side can surely engage with the tapered portion of the second convex portion 24. Therefore, the wheel 13 does not idle, and the shutter 14 can be opened and closed more reliably.
(5) Since the first convex portion 23 and the rack portion 22 of the shutter opener 20 have the same structure as the conventional structure, the parts can be shared and the manufacturing cost can be reduced.

(6) In the present embodiment, the recording medium driving device is configured by including the shutter opening/closing mechanism having the above-described configuration, and information recording/reproducing for recording and/or reproducing information in the disc-shaped information recording medium 12 is performed inside the housing 2. Since the reproduction mechanism is attached, it is possible to prevent the information recording/reproduction mechanism from interfering with the shutter 14 as the shutter 14 is opened and closed more reliably, and to record information on the disc-shaped information recording medium 12. -Playback can be performed more accurately.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.
For example, in the present embodiment, the second convex portion 24 has the tapered portion formed from the tip thereof toward the entrance side surface and the depth side surface, respectively, but in the present invention, the second convex portion 24 exits from the tip end of the second convex portion 24. The tapered portion may be formed toward the side surface, and the depth side may have an arc shape.

  In the above-described embodiment, the taper portion of the second convex portion 24 has an angle of about 45° with respect to the center line passing through the tip thereof. However, in the present invention, if the effect described above can be achieved, the angle is Not limited. For example, it may be in the range of 30° to 60°.

  INDUSTRIAL APPLICABILITY The present invention can be used as a shutter opening/closing mechanism for opening/closing a window in a cartridge whose center is located at a reference position inside a housing, and a recording medium driving device provided with this shutter opening/closing mechanism.

[0003]
[0008] An object of the present invention is to provide a shutter opening/closing mechanism and a recording medium driving device that can properly open/close the shutter even if the center of the cartridge does not coincide with the reference position of the housing.
[Means for Solving the Problems]
[0009] A shutter opening/closing mechanism of the present invention is a shutter opening/closing mechanism that engages with a wheel provided inside a cartridge inserted from an entrance/exit to open/close a shutter provided in the cartridge. Rack portions that are formed along the direction that is formed and that engage with the gear portion formed on the wheel, and first recesses that are formed on both sides of the rack portion and are formed on both sides of the gear portion of the wheel, respectively. And a second convex portion that engages with the second concave portion, respectively, and at least the second convex portion is urged toward the cartridge side, and the tip position thereof is the insertion completion. It is arranged on the entrance/exit side with respect to the center position of the wheel at the time, and at least the side surface on the entrance/exit side near the tip end portion is formed in a tapered shape.
[0010] A recording medium driving device of the present invention is a recording medium driving device including the above-described shutter opening/closing mechanism of the present invention, wherein a disk-shaped information recording medium housed in the cartridge is provided inside the casing. An information recording/reproducing mechanism for recording and/or reproducing information is attached.
[Brief description of drawings]
[0011] [FIG. 1] A cross-sectional view showing a conventional technique.
FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is an exploded perspective view of the cartridge.
FIG. 4 is a perspective view of a shutter opener.
[FIG. 5] A plan view showing an essential part of the present embodiment and showing an engagement relationship between a second convex portion and a second concave portion of the wheel.
FIG. 6 is a sectional view showing the operation of the shutter opening/closing mechanism.
[Explanation of symbols]
[0012] 1... Recording medium driving device, 2... Casing, 2A... Entrance/exit, 10... Cartridge, 10B... Window part, 12... Disc-shaped information recording medium, 12B... Window part, 13... Wheel, 13A... Gear part, 13B... 1st recessed part, 13C... 2nd recessed part, 14... Shutter, 20... Shutter opener, 22... Rack part,


3/1

Claims (6)

A shutter opening/closing mechanism that engages with a wheel provided inside a cartridge inserted through an entrance/exit to open/close a shutter provided in the cartridge,
A rack portion that is formed along the direction in which the cartridge is inserted and that engages with a gear portion formed on the wheel,
A first convex portion and a second convex portion which are formed on both sides of the rack portion and respectively engage with first concave portions and second concave portions formed on both sides of the gear portion of the wheel, respectively,
At least the second convex portion is biased toward the cartridge side, and the tip position thereof is arranged on the inlet/outlet side with respect to the center position of the wheel at the time of completion of insertion.
A shutter opening/closing mechanism. The shutter opening/closing mechanism according to claim 1,
The shutter opening/closing mechanism, wherein the second convex portion is arranged such that the entrance/exit side surface near the tip portion continues to contact the second concave portion even when the opening operation of the shutter is completed. The shutter opening/closing mechanism according to claim 1 or 2,
A shutter opening/closing mechanism, wherein at least a side surface on the entrance/exit side near the tip portion is formed in a tapered shape.   The shutter opening/closing mechanism according to claim 3, wherein the second convex portion is formed with a taper portion from a tip end thereof toward the entrance-side side surface and the depth-side side surface, respectively. Shutter opening/closing mechanism.   The shutter opening/closing mechanism according to claim 3 or 4, wherein the tapered portion is formed at an angle of approximately 45° with respect to a center line passing through a tip of the second convex portion. Opening and closing mechanism.   A recording medium driving device comprising the shutter opening/closing mechanism according to any one of claims 1 to 5, wherein information is recorded on a disc-shaped information recording medium housed in the cartridge inside the housing. And/or a recording medium driving device, characterized in that an information recording/reproducing mechanism for reproducing is attached.

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