JP4011342B2 - Disk cartridge positioning pin for disk unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk device, and more particularly to the disk cartridge positioning pin.
[0002]
[Prior art]
An example of a loading mechanism of a conventional MD recording / reproducing apparatus will be described with reference to FIG. The MD (mini disc) cartridge 6 shown in the drawing is inserted into the holder 4 and further transferred into the holder 4 until it abuts against the positioning portion 4a of the holder 4 by manual or loading mechanism. A shutter opening / closing leaf spring 5 that engages with a hole of the shutter 6 a of the MD cartridge 6 is caulked to the holder 4.
[0003]
The holder 4 holding the MD cartridge 6 is lowered in the direction of arrow D to hold the MD cartridge 6 in a fixed position with respect to the cartridge holding member 1 formed in the recording / reproducing unit chassis. That is, the front positioning pin 2 and the rear positioning pin 3 erected on the cartridge holding member 1 are fitted with the front positioning recess 6b and the rear positioning recess 6c provided on the MD cartridge 6 so that the MD cartridge 6 is positioned. Made.
[0004]
The shape of the front positioning pin 2 will be described with reference to FIG. The shape of the front positioning pin 2 is the same as that of the rear positioning pin 3, but a conical surface 2b is formed on a cylindrical surface 2a having a height h. That is, the front positioning pin 2 is symmetrical in the front-rear and left-right directions. The conical surface 2b serves to call the MD cartridge 6 into a fixed position, and the cylindrical surface 2a positions the MD cartridge 6.
[0005]
[Problems to be solved by the invention]
In the loading mechanism of the MD recording / reproducing apparatus described above, as shown in the bottom view of the MD cartridge 6 inserted into the holder 4 in FIG. Left side), and in contact with the positioning portion 4a.
[0006]
That is, since there is a clearance between the side surface of the MD cartridge 6 and the side surface of the holder 4, the MD cartridge 6 is moved to one side in the left-right direction, and is fed until it comes into contact with the positioning portion 4 a, so it is moved to the rear side. ing. The clearance between the side surface of the MD cartridge 6 and the side surface of the holder 4 needs to have a predetermined size due to a difference in thermal expansion coefficient and manufacturing tolerance.
[0007]
As described above, since the MD cartridge 6 is in an offset position in the holder, when the MD cartridge 6 is positioned, the front positioning recess 6b and the rear positioning recess 6c move from the position indicated by the solid line to the position indicated by the dotted line. That is, the right front surface of the conical surface 2b of the front positioning pin 2 pushes the surface of the positioning recess 6b to move the MD cartridge 6 to a fixed position.
[0008]
As shown in FIG. 7, the cylindrical surface 2a of the front positioning pin 2 needs to have a predetermined height (h shown in FIG. 6) in order to fit with the upper portion of the tapered portion 6d at the entrance of the front positioning recess 6b. If the inclination angle of the front positioning pin 2 with respect to the central axis of the conical surface 2b is large, the MD cartridge 6 is likely to bite. On the other hand, as shown by the dotted line in FIG. 7, if the inclination angle is reduced, biting does not occur, but the height of the conical surface 2 b is increased in order to secure a predetermined calling distance.
[0009]
In order to move the MD cartridge 6 to a position higher than the fixed position by the sum of the height h of the cylindrical surface 2a and the height of the conical surface 2b, it is necessary to increase the height of the entire apparatus by increasing the front positioning pin 2. There was an obstacle to designing the device compactly.
[0010]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to make it possible to design the apparatus in a compact manner and to prevent the biting between the positioning pin and the disk cartridge. It is to provide a positioning pin.
[0011]
[Means for Solving the Problems]
The disk cartridge positioning pin of the disk apparatus according to the present invention is a positioning pin formed so that a conical surface is connected to an upper part of a cylindrical surface, and is inclined at an acute angle with respect to a vertical line rather than an inclination angle of a vertical section of the conical surface. A single flat surface or a single conical surface is cut from the lower end of the cylindrical surface to the upper end of the conical surface so that the cut arc angle at the lower end of the cylindrical surface is less than 180 ° .
[0012]
Further, in the above positioning pin, a straight line passing through the center of a line lower end of the cut surface of the center of the circle which the lower end of the cylindrical surface is formed as a starting point is formed, the insertion opening of the disk cartridge to be inserted into the disk device It extends toward the side and the shutter side .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A disk cartridge positioning pin of a disk apparatus according to an embodiment of the present invention will be described with reference to the drawings. The loading mechanism of the MD recording / reproducing apparatus of the embodiment is obtained by replacing the front positioning pin 2 of the loading mechanism described in the prior art with the front positioning pin 2A shown in FIGS. 1 to 3, and the other configuration has been described in the conventional example. It is the same as that.
[0014]
In the front positioning pin 2A of the embodiment, the cylindrical surface 2a and the conical surface 2b are cut by a single flat cut surface 2c facing right front. The inclination angle of the cut surface 2c is smaller than the inclination angle of the conical surface 2b. That is, it is inclined at an acute angle with respect to the vertical line.
[0015]
The cut surface 2c comes into contact with the positioning recess of the MD cartridge to bring the MD cartridge to a fixed position. However, since the inclination angle is small, no biting occurs. And since it inclines over the part of the height of a cylindrical surface, it is not necessary to make the height of a positioning pin high. Although a part of the cylindrical surface is cut off, the circular arc angle of the cut-out portion is smaller than 180 °, so that the positioning accuracy is not impaired.
[0016]
Although the rear positioning pin has the same shape as that of the conventional one, it is less likely to bite because it is fitted with the rear positioning recess of the long hole shape. The rear positioning pin may also be cut off by the cut surface. In this case, the rear positioning pin fits into the positioning recess of the elongated hole, so that the cut surface may be directed to the side surface of the MD cartridge.
[0017]
The embodiment is configured as described above, but the invention is not limited to this. For example, the conical surface and the cylindrical surface of the positioning pin may be cut out by a conical surface having a small inclination angle. The present invention can also be applied to a disk device for a disk stored in a cartridge other than the MD.
[0018]
【The invention's effect】
According to the disk cartridge positioning pin of the disk apparatus of the present invention, the apparatus can be designed to be thin without impairing positioning accuracy and without causing biting between the disk cartridge and the positioning pin.
[Brief description of the drawings]
FIG. 1 is a plan view showing a cartridge holding member of an MD recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a cartridge positioning pin of the MD recording / reproducing apparatus.
3 (a) is a plan view showing the positioning pin, and FIG. 3 (b) is a view in the direction of arrow A in FIG. 3 (a).
FIG. 4 is a perspective view showing an example of a loading mechanism of a conventional MD recording / reproducing apparatus.
FIG. 5 is a partial bottom view of the MD recording / reproducing apparatus.
FIG. 6 is a perspective view showing a cartridge positioning pin of a conventional MD recording / reproducing apparatus.
FIG. 7 is a cross-sectional view showing a state where the MD positioning pin has positioned the cartridge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cartridge holding member 2, 2A Front side positioning pin, 2a Cylindrical surface, 2b Conical surface, 2c Cutting surface 3 Rear side positioning pin 4 Holder, 4a Positioning part 5 Shutter opening-and-closing leaf spring 6 MD cartridge, 6a Shutter, 6b Front side positioning recessed part 6c Rear positioning recess, 6d taper

Claims (2)

In the positioning pin formed so that the conical surface is continuous with the upper part of the cylindrical surface, the single pin or the single conical surface inclined at an acute angle with respect to a vertical line rather than the inclination angle of the vertical section of the conical surface . A disk cartridge positioning pin for a disk device, wherein a cutting arc angle at a lower end of the cylindrical surface is cut from a lower end of the cylindrical surface to an upper end of the conical surface to be less than 180 ° . Straight line passing through the center of a line lower end of the cut surface of the center of the circle which the lower end of the cylindrical surface is formed as a starting point is formed, toward the side of the disc cartridge insertion opening side and a shutter which is inserted into the disk device 2. The disk cartridge positioning pin of the disk apparatus according to claim 1, wherein the disk cartridge positioning pin extends .

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