JPS61276188A - Disk cartridge - Google Patents

Abstract

PURPOSE:To prevent dust produced when a shutter is opened/closed and contacts by fixing a resin member to the metallic shutter. CONSTITUTION:A disk cartridge 1' contains a resin member 20 fixed at the front part of the shutter and at the center of the cartridge 1'. Thus it is possible to prevent dust produced by the wear of a lower case 5 even though the shutter 9 is pressed and contacts the case 5 owing to the form of the shutter 9 itself when the shutter 9 is opened and closed since said contact is given between resin members. Furthermore, dust produced from the same reason can also be avoided by reducing the gap between the case 5 and the shutter 9 even in case the case 5 is deformed by aging changes, etc. and contacts the shutter 9.

Description

[Detailed Description of the Invention] [Summary] A disc cartridge that houses a disc-shaped recording medium inside a resinous cartridge case and further includes a metal shutter inside. A resin member with good mobility is provided to prevent dust from being generated due to contact between the shutter and the case when the shutter is opened and closed.

[Industrial application field]

The present invention relates to a disk cartridge having a resin cartridge case and a metal shutter inside, which is configured to prevent dust from being generated due to opening/closing contact of the shutter.

The disc-shaped recording medium housed in the cartridge case is
For example, in order to concentrically record information or reproduce it, a cartridge case has an opening into which a head is inserted and an opening into which a motor spindle is inserted to rotate the recording medium.

The above-mentioned recording medium, especially an optical disk, has a high information density, and the adhesion of dust, fingerprints, etc., or mechanical damage causes bit errors, which is a serious problem.

In order to minimize the chance of dust, fingerprints, etc. adhering to the recording medium, the above opening is opened when the recording medium is loaded into the drive device, whereas when it is stored or carried, the opening is opened outside the drive device. At times, a shutter is provided to close the opening.

This shutter is made of metal (aluminum) and is installed between the cartridge case and the recording medium.

The gap with the cartridge case is small. On the other hand, the cartridge case is made of resin and deforms over time.When the shutter is opened and closed, the cartridge case comes into contact with the cartridge case, causing the case to wear out and generate dust. Therefore, there is a need for a disk cartridge that does not generate dust when the shutter contacts the opening and closing of the shutter.

[Conventional technology]

As a conventional disk cartridge, there is an optical disk cartridge as shown in FIG. 3, for example. FIG. 3 shows an optical disk cartridge, in which figure (a) is a plan view and figure (b) is a side view.

In the figure, a optical disc cartridge (hereinafter referred to as a disc cartridge) 1 includes a recording medium 3 having a center hole (a hole into which a spindle is inserted) 2, and a cartridge case (an upper case 4 and a lower case 5) with the recording medium 3 inside. ). In supranuclear case 4, center hole 2
a central hole 6 that exposes the central hole 6; a recording/reproducing aperture 7 and an index detecting aperture 8 provided radially to the central hole 6;
The recording medium 3 has a structure that uses both sides, and the lower case 5 and the upper case 4 have the same shape. Furthermore, upper and lower cases 4
．． 5 has a shutter 9 that slides inside to shut off the central hole 6, the recording/reproducing opening 7, and the index detection opening 8.The shutter 9 has one end a as the center of rotation, and the longitudinal tip A spring 11 wound around a bobbin 10 is connected to the spring 11, and is constantly tensioned to the left in the figure. Also, one end of the steel belt 12 is fixed to the tip end, and the other end engages with the pin 13 of the drive device to move the rectangular guide member 1.
It is fixed at 4. Note that 16 is a roller that guides the steel belt 12, and 17 is a groove for moving the guide member 14.

This guide member 14 engages with the pin 13 of the drive device and 14
', the shutter 9 opens each opening, and as the pin 13 of the fork drive device and the guide member 14 are released from each other, the guide member 14 is returned by the spring 11 and the shutter 9 is closed. do.

[Problem that the invention seeks to solve]

The material of the upper and lower cases 4.5 of the conventional disk cartridge 1 is resin, and the shutter 9 that shields the opening is a long aluminum plate with a thickness of 1.6 ml, and is connected to the upper and lower cases 4.5 to prevent dust. The gap is made smaller (approximately 0.5+n)
. As shown in FIG. 4, the gap e is formed by fixing the tips of the two shutters 9 on both sides of the recording medium 3 with spacing members 18, and by the protrusions 19 of the upper and lower cases 4.5.

The shutter 9 is opened by using one end a of the shutter 9 as a rotational fulcrum and the other end being pulled by a steel belt 12, but the shape of the shutter 9 is doglegged, and gravity is applied to the front of the shutter 9. As shown in , the middle front part C of the lower shirt shirt 9 falls down and comes into contact with the lower case 5 more easily.

Furthermore, if the upper and lower cases 4.5 are deformed as shown by the dotted line in Figure 4 due to aging, etc., the protrusion 1 of the upper and lower cases 4.5
The gap e between the shutter 9 and the shutter 9 created by the shutter 9 becomes smaller, making the conditions for opening the shutter 9 even worse, and the shutter 9 comes into contact with the lower case 5. Therefore, there is a problem in that the lower case 5 is worn out and generates dust, which causes bit errors.

[Means for solving problems]

FIGS. 1(A) to 1(C) are diagrams for explaining the present invention in detail. Figure (A) is a cross-sectional view of the present invention corresponding to the conventional XX cross-sectional view in Figure 3 (A), Figure (B) is a plan view of the shutter, and (C) is a cross-section showing fixation of the resin member. It is a diagram.

In the figure, the upper and lower cases of the disk cartridge 4.5
The shutter 9 is exactly the same as that of the conventional disk cartridge I shown in FIG. 3(a).

In the present invention, as shown in FIG. 1(B), the resin member 2o is fixed at a position in the middle front of the shutter 9 where it is likely to fall. To fix the resin member 20, countersink the shutter 9 as shown in FIG. Try not to let it out. Note that the height h of the resin member 20 is 0.5 n. The other parts are the same as those in the conventional FIG. 3(A), so their explanation will be omitted.

[Effect]

That is, by fixing the resin member 2o to the middle front part of the shutter 9, the upper and lower cases 4.
Since the shutter 9 inside the shutter 9 has a dogleg shape, the middle front part C of the shutter 9 comes into contact with the lower case 5 when the shutter 9 starts opening. Even if the lower case 5 makes contact, the resin member 2
o comes into contact with the resin case (lower case 5), and the contact is between the resins, making it possible to prevent the generation of dust due to wear of the lower case 5.

〔Example〕

FIG. 2 is a diagram illustrating one embodiment of the present invention.

Note that the same reference numerals indicate the same objects throughout the figures.

The disk cartridge 1' shown in FIG. 2 has a resin member 20 fixed to the middle front part of the shutter 9. As shown in FIG.

Thereby, even if the shutter 9 is pushed by the shutter 9 due to its shape and comes into contact with the lower case 5 when the shutter 9 is opened, the resins come into contact with each other, and dust generation due to wear of the lower case 5 can be prevented.

Furthermore, even if the lower case 5 deforms due to aging etc. and the conditions deteriorate and the shutter 9 and the lower case 5 come into contact, the gap between the lower case 5 and the shutter 9 can be similarly reduced and the shutter Even if the lower case 9 and the lower case 5 come into contact, generation of dust due to wear of the lower case 5 can be prevented.

In this embodiment, polysecure resin having good lubricity is provided at two locations where the metal shutter 9 is likely to fall, but the number is not limited to two. Also, although polyacecool resin is used, other resins may be used as long as they have lubricity.

〔Effect of the invention〕

As explained above, according to the present invention, by fixing the resin member to the metal shutter, it is possible to prevent the generation of dust when the shutter contacts the opening and closing of the shutter.

[Brief explanation of the drawing]

Figures 1 (A), (B), and (C) are diagrams explaining the present invention in detail; Figure 2 is a diagram explaining the invention in detail; Figure 3 is a diagram explaining a conventional optical disk cartridge; 4 is a sectional view taken along line PP in FIG. 3, and FIG. 5 is a sectional view taken along line XX in FIG. 3. In the figure, 1' is a disk cartridge, 3 is a recording medium, 4 is an upper case, 5 is a lower case, 6 is a center hole, 7 is a recording/playback opening, 8 is an index detection opening, 9 is a shutter, and 10 is a Bobbin, 11 is a spring, 12 is a steel belt, 14 is a guide member, Shiny Ming Principle 1 Shobutsu 1'' prisoner leather 3g $3 P-F appeal leather 4 @

Claims (1)

[Claims] A disc-shaped recording medium (3) is housed inside the cartridge case (4) (5), and an opening for recording or reproducing information on the disc-shaped recording medium (3) is provided. The cartridge case (4) (5) has an openable and closable metal shutter (9) inside the cartridge case (4) (5) which can cover or open each opening when necessary, and the shutter (9) A disk cartridge having a guide member for opening and closing cartridge cases (4) and (5) from the outside, wherein the two metal shutters on both sides of the disc-shaped recording medium (3) (9) A disk cartridge characterized in that a resin member (20) is provided to prevent the shutter (9) and the cartridge cases (4, 5) from coming into contact with each other.