JPH11260019A - Shutter engaging mechanism of optical disk cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the degree of freedom of the design of a die for injection molding, to easily manufacture the die, and to facilitate the assembly of a shutter mechanism to a shell by separating the locking mechanism of a spring for energizing the shutter mechanism to closing from a fitting mechanism that can be slid on the shell. SOLUTION: A projection 40 fitting to the inside plate of a plastic shutter is 20 made of a plastic which engages grooves 41 on the outside of shells 30 and 31 for guiding the 1-piece type shutter 20 is provided. In this way the slidable fitting mechanism between the 1-piece type shutter 20 and the shells 30 and 31 and a spring locking part 34 move to different sites where they can be separated. Since the 1-piece type shutter 20 is plastic one-piece molding, the fitting system of the slidably fitting mechanism between the shutter 20 and the shells 30 and 31 can be easily selected, thus increasing the degree of freedom of the design of the shutter mechanism part. Accordingly, separating the shells 30 and 31 including a slider opening direction leg part and a spring fixing part 34 from the fitting part of the slider can be realized according to the function.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk cartridge or the like, in which a plastic integrated shutter in which a slider portion and a shutter plate portion are integrally formed, and a shell (outer shell) of the cartridge. The present invention relates to a movable fitting mechanism.

2. Description of the Related Art Conventionally, a rewritable recording medium, such as an optical disc cartridge, is generally used for accommodating a medium called a shell or the like constituting an A surface and a B surface in order to protect the medium from contact with fingers and dust. It is stored in an outer shell container so that it cannot be removed, and is used as it is by inserting it into a driving device. For this reason, the shell has a medium for the drive, such as a window for the motor of the drive to access the medium for gripping the disk-shaped medium, and a window for the head assembly for reading and writing. Windows for access to various functional components that need to be close to the device are provided on both sides.

In such a window, the surface of the internal medium disk is exposed. Therefore, the window is closed when not in use, and opened when inserted into the drive, so that the drive mechanism required for operation can be accessed. Is provided with a flat shutter plate, which is normally urged to the closed side by a spring or the like, and is opened and used by a mechanism on the driving device side. Since optical disk cartridges and the like usually have access bodies on both the front and back sides of the disk, the shutter plate is formed in a substantially U-shape with one side of the cartridge hakama, making it a shutter for both sides, and opening and closing it at the same time Like that.

Conventionally, since the shutter plate is made of a metal such as stainless steel or an aluminum alloy, it is difficult to fit the shutter plate directly to the shell and slide the shutter to open and close the shutter. Therefore, a slider called a slider is separately made of high-sliding resin, the shell and the slider are fitted together, the slidability is maintained between the shell and the slider, and the slider has a shutter plate attached to the slider and fixed with screws. The spring is biased toward the closing side of the shutter by fixing the spring end to the slider. This shutter mechanism is composed of a shutter plate, a slider, two screws, and usually four parts. Since the number of parts is large and the number of assembly steps is required, there is a problem that cost reduction is difficult. An integrated shutter in which a slider and a shutter plate are integrally configured has been proposed. However, when the conventional fitting method is adopted, the slider leg and the spring fixing mechanism are concentrated in one place, so that the structure becomes complicated, and it is difficult to produce a plastic injection mold having high productivity.

SUMMARY OF THE INVENTION The present invention relates to such an integrated shutter structure, in which a spring locking mechanism for urging the shutter mechanism in the closing direction and a sliding of the shutter mechanism with respect to the shell. Avoid the complicated structure where the movable fitting mechanism is concentrated in one place. Separation increases the degree of freedom of the design of the injection mold and facilitates the mold manufacturing. Facilitates assembly.

[Means for Solving the Problems] A slidable fitting mechanism between a slider leg piece formed at the shutter opening side end of an integrated shutter and the inside of two shells A and B. Has a slidable fitting structure between the inside of the shutter plate on one side or both sides and the outside of the shell, and separates the spring locking mechanism formed on the slider leg at the shutter opening side end.

[Embodiment of the Invention] A "U" -shaped shutter plate (5), a slider (1), and a slider and "U" which constitute a shutter mechanism of a current 3.5-inch magneto-optical disc cartridge are provided. FIG. 1 shows an example of a screw (6) for fixing the shutter to the letter-shaped shutter and a spring member (7) for urging the entire shutter mechanism in the closing direction.
The "U" -shaped shutter plate is made of stainless steel or an aluminum alloy, and the slider is made of plastic made by injection molding of a polyacetal resin having good slidability. The "U" -shaped shutter plate is coupled to the slider with a screw to form a shutter mechanism, and the slider guide rail formed on the inner surface of the cartridge has slider open leg pieces (4) and closed leg pieces (3). ) Are slidably fitted to each other and biased toward the closing side by a spring to constitute the entire shutter opening / closing mechanism. As the spring, a "V" -shaped coil spring as shown in FIG. 1 is usually used.

In the conventional shutter mechanism, the slidable fitting at the time of opening and closing between the shutter mechanism and the shell is performed by fitting a rail provided inside the shell at both the closing direction end and the opening direction end of the slider. This was done by the fact that the shutter plate was fixed with screws with a slider in a hakama. The structure at the end in the opening direction of the fitting portion has a split groove so as not to interfere with the trajectory drawn by the leg of the spring locked in the vicinity of this portion when the shutter is opened and closed. As shown in the cross-sectional view of FIG. 3, the open leg portions of the shell and the slider are provided with convex protrusions on the slider side as shown in FIG.
Either a concave groove is provided on the inner side of the shell to be fitted with this protrusion, or a concave groove is provided on the slider side as shown in FIG. It is used in a mixture.

In the integrated shutter, since the shutter plate and the slider are integrally formed of a plastic material, the sliding fitting mechanism between the integrated shutter and the shell includes the inside of the shutter plate. Various fitting methods can be adopted, and the degree of freedom in designing the shutter mechanism is increased. Accordingly, the fitting part of the shell and the slider including the slider opening end leg, the spring fixing part, and the like, which has been conventionally concentrated and complicated, is transferred to and separated into different parts according to functions, and the mold structure and the assembling method. Can be made easier.

[Embodiment 1] In the conventional system, as shown in FIG. 3, the shutter plate has only the function of simply covering the shell window portion, and the spring engages the slider to bias the shutter mechanism in the closing direction. The structure was such that both functions, such as a stop mechanism and a fitting mechanism slidable to the shell of the shutter mechanism, were concentrated in one place. The slider not only has the function of fitting the shutter mechanism slidably in the opening and closing direction, but also keeps the fitting in the vertical direction so as not to fall off the shell until the shutter plate is screwed during the cartridge assembly process. In order to maintain the vertical fitting between the upper and lower ends of the slider fitting projection and the upper and lower ends of the shell fitting groove, it is necessary to make the fitting projection of the slider and the fitting groove of the shell side almost the same shape. there were.

According to the present invention, as shown in FIG. 4 (a), in an integrated plastic shutter, a convex projection for fitting with a shell is provided inside a shutter plate, and an integrated shutter is guided outside the shell. This is a fitting structure having a concave groove to be formed. With this structure, the slidable fitting mechanism between the integral shutter and the shell and the spring locking portion can be transferred to and separated from each other by function.

[Embodiment 2] FIG. 4 (b) shows a groove formed so that the lower end of the slider portion is set above the fixed end of the spring leg so as not to interfere with the locus drawn by the leg of the spring on the slider portion. Is unnecessary. Also, when the integral shutter is incorporated into the shell, the vertical movement between the integral shutter and the shell is prevented by the upper shutter locking portion composed of the upper surface of the shell and the lower surface of the top of the integral shutter. Unlike the conventional slider mechanism, it is different from the conventional slider mechanism because it is performed by the shutter lower locking part composed of the upper surface of the fitting protrusion and the upper surface of the shell outer fitting groove. There is no need for a design constraint of having substantially the same shape. For example, as shown in FIG. 4B, the shape of the fitting protrusion on the slider side and the shape of the fitting groove on the shell side may be different.

[Embodiment 3] As shown in FIG.
When applying the integrated shutter, a convex projection is provided on the inside of the shutter plate on one side, a concave groove is formed on the outside of the corresponding shell to fit this projection, and the fitting part on the other side is a slider part. A projection was provided, and a concave groove was formed inside the corresponding shell surface so as to fit with the projection. FIG.
As shown in (b), a concave groove was provided in the slider portion at the fitting portion on the other surface side, and a convex band-like projection was formed on the inside of the corresponding shell surface so as to fit with the concave groove. Depending on the type of plastic used for manufacturing the integrated shutter, appearance shrinkage may occur due to "shrinkage" due to molding shrinkage during injection molding. In particular, in order to avoid appearance defects on the side B, which is the surface of the cartridge, FIG.
The configuration of (b) is adopted. Of course, FIG.
The structure of [Example 2] can be additionally applied to the structure of (b).

[Effects of the Invention] According to the present invention, it is possible to design the spring locking mechanism and the slider open side leg structure of the integrated shutter separately, and the degree of freedom in designing a plastic injection mold is increased.

[Brief description of the drawings]

FIG. 1 is an external view showing parts for a shutter mechanism and a shutter biasing spring used in a conventional 3.5-inch magneto-optical disk cartridge.

FIG. 2 is an external view showing an integrated shutter mechanism and a biasing spring thereof.

FIG. 3 is a cross-sectional view of a shutter mechanism of an end leg portion of a slider in a shutter opening side in a conventional shutter mechanism. (A) Structural sectional drawing which provided the fitting protrusion on the slider side and the fitting groove in the shell side. (B) Structural sectional view in which a fitting groove is provided on a slider side and a fitting protrusion is provided on a shell side.

FIG. 4 is a sectional view showing an embodiment of an end leg portion in a shutter opening side according to the present invention. (A) A sectional view of a fitting portion having a split groove so as not to interfere with a locus drawn by a leg of a spring. (B) A cross-sectional view of a structure that does not require the formation of a split groove and has different shapes of a fitting protrusion and a fitting groove in a fitting portion.

FIG. 5 is a sectional view showing an embodiment of an end leg portion in the shutter opening side according to the present invention. (A) Structural sectional view in which a projection is provided on the slider side and a groove is provided on the inside of the corresponding shell surface at the fitting portion on the B side. (B) At the fitting portion on the B side, a groove is provided on the slider side,
FIG. 3 is a structural sectional view in which a projection is provided inside a corresponding shell surface.

FIG. 6 is a three-dimensional view showing the appearance of a 3.5-inch magneto-optical disc cartridge equipped with an integrated shutter. (A) The figure seen from the B side. (B) The figure seen from A side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slider 2 Head piece 3 Closed side leg piece 4 Open side leg piece 5 "U-shaped" shutter plate 6 Screw 7 Spring 20 Integrated shutter 21 Slider head piece 22 Slider closed side leg piece 23 Slider open side leg piece 24 B Surface side shutter plate 25 Surface A side shutter plate 30 Surface B shell 31 Surface A shell 32 Slider side fitting projection 33 Shell inside fitting groove 34 Spring locking part 35 Split groove 36 Shell inside fitting projection 37 Slider side fitting groove 40 Shutter plate inner fitting projection 41 Shell outer fitting groove 42 Shutter upper locking part 43 Shutter lower locking part 44 Spring leg part 45 Slider part lower end position 50 Shell inner fitting groove 51 Slider part fitting projection 60 Writing Prohibition detection unit 61 Label on B side 62 Write-protect key operation unit 63 Reference hole 64 Alignment hole 65 Label on A side 66 Hold down shutter

Claims (2)

[Claims] 1. A recording / reproducing disk medium is housed inside,
When applying a plastic shutter in which a slider portion and a shutter plate portion are integrally formed to a disk cartridge having a window portion for accessing a recording / reproducing head and a motor for driving a disc, an inner side of a shutter plate at an open end is used. A recording / reproducing optical disk characterized in that a convex projection is provided on the outer surface of the shell, and a concave groove structure for fitting the projection is provided on a corresponding outer portion of the shell, and the shutter and the shell are slidably fitted. cartridge. 2. A recording / reproducing disk medium is housed therein.
When applying a plastic shutter in which a slider portion and a shutter plate portion are integrally formed to a disk cartridge having a window portion for accessing a recording / reproducing head and a disk drive motor, a shutter plate on one side is opened. A convex projection is provided on the inside of the side end, and a concave groove structure to be fitted with this projection is provided on a corresponding shell outer portion,
On the other surface side, a concave groove or a convex band-like projection is formed inside the shell surface, and a convex portion which can be fitted and slid on a shutter portion inside the shell corresponding to this at the shutter open side end. Providing a sliding leg having a projection or concave groove structure,
An optical disc cartridge for recording / reproducing wherein a shutter and a cartridge shell are slidably assembled by the fitting.