JP3365906B2 - Dustproof door opening and closing mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a recording / reproducing apparatus for a recording medium, and more particularly, to opening and closing a dustproof door for covering a slot for a so-called mini disk, floppy disk, cassette tape, or the like. About the mechanism. 2. Description of the Related Art A dustproof door opening / closing mechanism for covering a recording medium insertion opening of a recording medium recording / reproducing apparatus is conventionally provided as shown in FIG.
There is a front panel 2 in which the dustproof door 1 rotates only in the recording medium insertion direction. According to this opening and closing mechanism, when a recording medium such as a mini disk is manually inserted through the insertion slot,
The dustproof door 1 is rotated in the direction of the arrow by the recording medium.
When the recording medium is discharged, the dustproof door 1 cannot be rotated in the recording medium discharge direction, so the dustproof door 1 must be rotated in the direction of the arrow immediately before the recording medium is discharged. Therefore, there is a problem that a driving mechanism of the dustproof door 1 is required, and the manufacturing cost is increased. As shown in FIG. 11, there is an opening / closing mechanism which is supported by a front panel 2 so that the dustproof door 1 can be rotated in both directions of insertion and ejection of a recording medium. If the recording medium is ejected until it is ejected from the insertion opening and then pushed into the inside by hand, it is difficult to push the recording medium to the position where the loading mechanism draws in because the dustproof door 1 is in the way. SUMMARY OF THE INVENTION [0004] The present invention has been made in view of the above points, and has as its object to reduce the manufacturing cost and to allow a recording medium to protrude from an insertion slot. An object of the present invention is to provide a dustproof door opening / closing mechanism that can easily push a recording medium to a position where the loading mechanism pulls in after the sheet is ejected. [0005] A dustproof door opening and closing mechanism according to the present invention has shafts erected on both sides of a dustproof door covering a recording medium insertion opening of a front panel, and is provided integrally with the front panel. At least one of the bearing holes through which the shaft is inserted is an elongated hole extending in the recording medium insertion direction, and a substantially vertical spring receiving surface is provided near the axis inserted through the elongated hole at a closed position where the dustproof door is vertical, The dustproof door is urged in the recording medium discharge direction by pressing a torsion coil spring against the spring receiving surface. In such a mechanism, when the dustproof door is closed, the dustproof door is pushed by the torsion coil spring and is at the front end of the elongated hole, and the spring receiving surface is pushed by the torsion coil spring. The rotation position is also stable. Since the dustproof door is pushed and rotated by the recording medium when the recording medium is inserted and ejected, there is no need for a mechanism for driving the dustproof door. When the recording medium is ejected from the insertion slot until the recording medium is ejected, the dust-proof door is pushed into the front panel together with the recording medium against the elasticity of the torsion coil spring when the recording medium is pushed in as it is. Therefore, the recording medium can be easily pushed to the position where the loading mechanism is pulled in. A dustproof door opening / closing mechanism according to an embodiment of the present invention will be described with reference to the drawings. In this example, the present invention is applied to a recording / reproducing apparatus for a magneto-optical disk, a so-called mini disk. FIG. 4 shows a front panel 2 of the mini disc recording / reproducing apparatus. An operation knob and a display device are arranged on the front panel 2, and a mini-disc insertion slot is arranged at the center. The mini disk insertion slot is covered with a dustproof door 1. FIG. 3 shows a detailed shape of the dustproof door 1. Projections 1d, 1d are provided on the front surface of the dustproof door 1 shown in the figure, and projections 1c are provided on the back surface. Cylindrical shafts 1a, 1a are formed on both sides of the dustproof door 1 so as to be symmetrical. A flat spring receiving surface 1b is formed on the back surface of the base end of each of the shafts 1a and 1a. FIG. 1 and FIG. 2 show how the dustproof door 1 is mounted. As shown in the figure, a boss formed on the back surface of the front panel 2 is provided with an elongated hole 2a. The long hole 2a is a bearing hole of the dustproof door 1. Although not shown, the right bearing hole is a circular hole. The shafts 1a, 1a of the dustproof door 1 are inserted into such bearing holes.
The dustproof door 1 is made of resin, and can be inserted into the left and right bearing holes by being deformed. A torsion coil spring 3 is mounted near the left shaft 1a of the dustproof door 1 and pushes the bearing surface 1b of the dustproof door 1 forward. The dustproof door 1 is rotatable in both directions around the shaft 1a from the position shown in FIG. 2, but is normally stable at the position shown in FIG. 2, that is, the position for closing the mini-disc insertion slot by the pressing force of the torsion coil spring 3. are doing. FIG. 5 shows a state in which the mini disk 5 is inserted from the insertion slot. At this time, the dustproof door 1 is pushed by the mini-disc 5 and pivots counterclockwise so as not to prevent the mini-disc 5 from entering. Since the projections 1d and 1d of the dustproof door 1 are in contact with the upper surface of the mini disc 5 and the entire surface of the dustproof door 1 is not in contact with the mini disc 5, noise due to friction is hardly generated. FIG. 6 shows a state where the mini disk 5 is ejected from the insertion slot. At this time, the dustproof door 1 is pushed by the mini-disc 5 and rotates clockwise so as not to hinder the ejection of the mini-disc 5. Since the projection 1c of the dustproof door 1 contacts the upper surface of the mini disk 5 and the entire surface of the dustproof door 1 does not contact the mini disk 5, noise due to friction is less likely to be generated. FIG. 7 shows a state in which the mini-disc 5 is pushed out with a finger in a state where the mini-disc 5 is ejected and protrudes from the insertion slot. At this time, since the left portion of the dustproof door 1 is pushed into the inside by a finger against the elasticity of the torsion coil spring 3, the mini disk 5 can be easily pushed to the position where the loading mechanism 4 is pulled in. When the mini disk 5 is loaded to the reproduction position by the loading mechanism 4, the dustproof door 1 is pushed forward by the torsion coil spring 3 and returned to the position shown in FIG. FIG. 8 shows another embodiment of the present invention. FIG.
(A) is a side view showing a portion of a long hole 2b provided in the front panel 2, and (b) of FIG. 8 is a plan view showing the same portion. FIGS. 8C and 8D are side views showing a bearing hole, which is not a long hole, provided in the front panel 2. 8 (c) or 8 (d) is used. By releasing a part of the bearing hole in this way, the dustproof door 1 can be attached to the front panel 2 without deformation. FIG. 9 shows still another embodiment of the present invention. In this example, the spring receiving surface 1b of the dustproof door 1 is formed by a flat surface with a part of a cylindrical shape cut away. When such a spring receiving surface 1b is used, the movement of the dustproof door 1 that rotates while being pressed by the torsion coil spring becomes smooth. Although the embodiment is constructed as described above, the invention is not limited to this. For example, the right side of the dustproof door 1 may be biased by a torsion coil spring. According to the dust-proof door opening / closing mechanism of the present invention, a driving mechanism for opening and closing the dust-proof door is not required, so that the manufacturing cost is reduced. Moreover, after the recording medium is ejected until it protrudes from the insertion slot, the recording medium can be pushed into the back as it is, so that the degree of freedom in the arrangement of the loading mechanism is increased. The dustproof door is rotatable in both directions. However, since the flat portion is pressed by the torsion coil spring, the rotating position is stabilized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a dustproof door opening / closing mechanism according to an embodiment of the present invention. FIG. 2 is a sectional view showing the dustproof door opening / closing mechanism. 3 (a) is a rear view showing a dustproof door of the dustproof door opening / closing mechanism, FIG. 3 (b) is a plan view showing the dustproof door, and FIG. 3 (c) is a front view showing the dustproof door. FIG. 3D is an enlarged side view showing the dustproof door. FIG. 4 is a front view showing a front panel using the dustproof door opening / closing mechanism. FIG. 5 is a sectional view showing an operation of the dustproof door opening / closing mechanism. FIG. 6 is a sectional view showing an operation of the dustproof door opening / closing mechanism. FIG. 7 is a sectional view showing the operation of the dustproof door opening / closing mechanism. 8 (a), 8 (c) and 8 (d) are side views showing another embodiment of the present invention, and FIG. 8 (b) is a plan view showing the same embodiment. FIG. 9 is a sectional view showing still another embodiment of the present invention. FIG. 10 is a sectional view showing an example of a conventional dustproof door opening / closing mechanism. FIG. 11 is a sectional view showing another example of the conventional dustproof door opening / closing mechanism. [Description of Signs] 1 Dustproof door, 1a shaft, 1b spring receiving surface, 1c, 1
d Projection 2 Front panel, 2a long hole, 2b long hole, 2c,
2d bearing hole 3 torsion coil spring 4 loading mechanism 5 mini disk

Continued on the front page (56) References Japanese Utility Model Showa 57-149507 (JP, U) Japanese Utility Model Showa 59-145702 (JP, U) Japanese Utility Model Showa 50-133125 (JP, U) Japanese Utility Model Showa 49-11716 (JP) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 33/02 503 H05K 5/00

Claims (1)

(57) [Claim 1] A shaft is erected on both sides of a dustproof door covering a recording medium insertion opening of a front panel, and a bearing hole is provided integrally with the front panel and through which the shaft is inserted. At least one of the elongated holes extends in the recording medium insertion direction, and a substantially vertical spring receiving surface is provided near the shaft inserted through the elongated hole at a closed position where the dustproof door is vertical, and a torsion coil spring is provided in the spring receiving surface. A dust-proof door opening / closing mechanism, wherein the dust-proof door is urged in the recording medium discharge direction by pressing against the recording medium.