CN1901079B - cartridge recording media - Google Patents

Abstract

A recording medium cartridge includes an information recording medium, an inner rotor, and a shutter accommodated in a stacked state in a cartridge body. When the inner rotor rotates, the shutter member opens and closes the opening portion of the case. A plurality of first ribs for reducing a contact area of the shutter and the inner rotor are provided on an overlapping surface of the shutter and the inner rotor. In the side portion of the shutter member, first and second overlapping portions are respectively provided by a first stepped portion and a second stepped portion in a moving direction of the shutter member. When the side portions overlap each other, on the upper surface side of the shutter member, the first overlapping portion of the one shutter member and the other shutter member are continuously connected together by the first stepped portion. On the lower surface side of the shutter member, second overlapping portions of one shutter member and the other shutter member are continuously connected together through a second step portion to close an opening portion in the case for recording and reproducing information. The first and second step portions are arranged in a non-overlapping position.

Description

cartridge recording media

This application is a divisional application of the patent application for invention with the application number 200410055244.6 submitted by Sony Corporation to the China Patent Office on June 23, 2004.

technical field

The present invention relates to a recording medium cartridge in which an information recording medium, an inner rotor, and a shutter are housed in a stacked state within the cartridge. When the inner rotor is rotated, the shutter overlaid on the inner rotor moves between a first position for closing an opening portion provided in the case and a second position for opening the opening portion.

Background technique

As shown in FIGS. 31 to 33, a recording medium cartridge 101 is a known type of recording medium that accommodates an information recording medium 103, an inner rotor 104, and a shutter 105 in a stacked state in a cartridge body 102, when When the inner rotor 104 is turned, the shutter 105 overlaid on the inner rotor 104 is in the first position (see FIG. 31 ) for closing the opening 106 provided in the case body 102 and the second position for opening the opening 106. position (see Figure 32).

As shown in FIG. 33, an overlapping surface 107 of the inner rotor 104 and the shutter 105 is formed in a planar manner. The inner rotor 104 comes into contact with the shutter 105 over substantially the entire area of the overlapping surface 107 .

Furthermore, as shown in FIG. 34 , the shutter 105 includes a pair of shutter members 111 and 112 . On the mutually overlapping chord sides 111a and 112a of the pair of shutter members 111 and 112 in the direction of movement of the shutter members 111 and 112 (the direction shown by the arrow mark A-B), the shutter 105 is provided with a first step portion 113 through the first step. An overlapping portion 114 and a second overlapping portion 115 . When the opposed chord sides 111a and 112a of the pair of shutter parts 111 and 112 overlap each other, as shown in FIG. The portion 113 is continuously connected to a first overlapping portion 114 of the other shutter member 112 . As shown in FIG. 36, on the lower surface of the shutter members 111 and 112, the second overlapping portion 115 of one shutter member 111 is continuously connected to the second overlapping portion 116 of the other shutter member 112 through the second step portion 116 in an overlapped state. Overlap 115. As shown in FIG. 31, a recording medium cartridge 101 is known, and an opening portion 106 provided in a cartridge body 102 for recording and reproducing data is designed to be closable. In a typical recording medium cartridge 101, the first stepped portion 113 and the second stepped portion 116 are formed in parallel to the opening and closing movement directions of the shutter members 111 and 112 (for example, see Japanese Patent Application Laid-Open No. 2001- 332054).

The recording medium cartridge 101 described above has problems as described below.

(1) As shown in FIG. 33 , since the overlapping surface 107 of the inner rotor 104 and the shutter 105 is formed on a plane, the inner rotor 104 and the shutter 105 contact each other over substantially the entire area of the overlapping surface 107 . Therefore, frictional resistance becomes large, preventing smooth movement of the pair of shutter members 111 and 112 .

(2) As shown in FIG. 35 , the first stepped portion 113 and the second stepped portion 116 vertically overlap each other, wherein the first overlapping portion 114 of the first shutter member 111 and the first overlapping portion 114 of the other shutter member 112 The first step portion 113 of the boundary line between is exposed on the upper surfaces of the pair of shutter members 111 and 112, between the second overlapping portion 115 of one shutter member 111 and the second overlapping portion 115 of the other shutter member 112 The second stepped portion 116 is exposed on the lower surfaces of the pair of shutter members 111 and 112, as shown in FIG. 36 . Therefore, the rigidity of the overlapping portion is reduced. In addition, since the second stepped portion 116 and the first stepped portion 113 overlap each other, dust or the like easily enters through these stepped portions 116 and 113 from the outside.

(3) Further, as shown in FIG. 37 , the first stepped portion 113 and the second stepped portion 116 are formed parallel to the moving direction A-B of the shutter members 111 and 112 . Therefore, when the pair of shutter members 111 and 112 are closed, the pair of shutter members 111 and 112 move from the completely lateral direction of the first step portion 113 and the second step portion 116 thereof, respectively. Therefore, as shown in FIG. 38, the first and second stepped portions 113 and 116 of one shutter member 111 are finally superimposed on the first and second stepped portions 113 and 116 of the other shutter member 112 with a specified gap G . The smaller the gap G is, the better the dust prevention effect will be. However, if the gap G is too small, the first and second stepped portions 113 and 116 of one shutter member 111 may be separated from each other due to a dimensional error in manufacturing the pair of shutter members 111 and 112 or an assembly error in assembling the shutter members. The first and second stepped portions 113 and 116 of the other shutter member 112 interfere with each other. Therefore, the chord sides 111a and 112a of the pair of shutter members 111 and 112 cannot overlap each other. In order to avoid the interference of the step portion generated when the pair of shutter members 111 and 112 are closed, the gap G may be set wider. However, when the gap G is wide, dust or the like is likely to enter the case body 102 .

Contents of the invention

An object of the present invention is to provide a recording medium cartridge in which the contact area of the inner rotor and the shutter on the overlapping surface is reduced, thereby reducing the frictional resistance generated between the inner rotor and the shutter so that the shutter can be smoothly moved. is moved, and the rib is provided so that dust or the like enters the information recording medium side from the gap formed between the inner rotor and the shutter through the opening portion.

Furthermore, another object of the present invention is to provide a recording medium cartridge in which, when a pair of shutter members are closed, the stepped portion exposed on the front surface of the shutter member and the stepped portion exposed on the rear surface can be reinforced, and when the pair of shutter members is closed, When the shutter members are closed, the stepped portion of one shutter member can surely come into close contact with the stepped portion of the other shutter member.

According to a first aspect of the present invention, a recording medium cartridge includes an information recording medium, an inner rotor, and a shutter accommodated in a stacked state in a cartridge body. When the inner rotor is rotated, the shutter overlaid on the inner rotor moves between a first position for closing the opening portion provided in the case and a second position for opening the opening portion. A first rib for reducing a contact area between the shutter and the inner rotor is provided on an overlapping surface of the shutter and the inner rotor.

Therefore, frictional resistance generated between the inner rotor and the shutter is reduced when the shutter is moved, so that the shutter can be moved smoothly.

According to a second aspect of the present invention, in the above-mentioned recording medium cartridge according to the first aspect, the first ribs are formed with a height exceeding 0 and not higher than 0.05 mm. Therefore, the gap formed between the inner rotor and the shutter is suppressed to a minimum as required to suppress entry of dust or the like into the gap.

According to a third aspect of the present invention, in the above-mentioned recording medium cartridge according to the first aspect, a plurality of first ribs are formed on the surface of the inner rotor along the rotation locus of the shutter.

Therefore, when the shutter is positioned at the first position for closing the opening portion, or when the shutter is positioned at the second position for opening the opening portion, the shutter can be brought into contact with the first rib.

According to a fourth aspect of the present invention, in the recording medium cartridge described in the third aspect, the end portion of the first rib in the opening portion is formed along the peripheral edge portion of the opening portion for closing a plurality of first ribs. The gap between the ribs is the second convex rib.

Therefore, even if dust or the like exists in the gaps between the plurality of first ribs, it is possible to prevent the dust or the like from entering the opening side.

According to a fifth aspect of the present invention, a recording medium cartridge includes: a pair of shutter members respectively including a first overlapping portion and a second overlapping portion formed by a step portion in a moving direction of the shutter member in a string side . When the chord sides of the pair of shutter members overlap each other, the first overlapping portion of one shutter member exposed on the upper surface side of the pair of shutter members is continuously connected to the first overlapping portion of the other shutter member through the first stepped portion. together, the second overlapping portion of the one shutter member exposed on the lower surface side of the pair of shutter members and the second overlapping portion of the other shutter member are continuously connected together in an overlapping state by the second step portion, to close the opening portion provided in the case for recording and reproducing information. The first stepped portion exposed on the upper surface side of the shutter member does not overlap the second stepped portion exposed on the lower surface side of the shutter member. Therefore, the stepped portion of the other shutter member is supported by the one shutter member.

According to a sixth aspect of the present invention, in the above-mentioned recording medium cartridge described in the fifth aspect, the stepped portion is formed in a direction not parallel to the direction of opening and closing movement of the shutter member.

Therefore, the stepped portions of the pair of shutter members are opposed and close to each other, unlike a conventional recording medium cartridge in which the stepped portions of the pair of shutter members are completely laterally displaced from and overlapped with each other.

According to a seventh aspect of the present invention, in the above-mentioned recording medium cartridge described in the sixth aspect, the first step portion and the second step are formed at an inclination angle of about 45 degrees with respect to the opening and closing movement direction of the shutter member. part.

Therefore, when the pair of shutter members moves in the opening and closing directions, the stepped portion is designed such that the gap in the opening and closing moving directions is reduced substantially the same as the gap substantially perpendicular to the opening and closing moving directions. amount.

According to an eighth aspect of the present invention, a recording medium cartridge includes: a pair of shutter members respectively including a first overlapping portion and a second overlapping portion formed by a stepped portion in a moving direction of the shutter members in the string side. When the chord sides of the pair of shutter members overlap each other, the first overlapping portion of one shutter member exposed on the upper surface side of the pair of shutter members is continuously connected to the first overlapping portion of the other shutter member through the first stepped portion. Together, the second overlapping portion of the one shutter member exposed on the side of the lower surface of the pair of shutter members and the second overlapping portion of the other shutter member are continuously connected together in an overlapping state through the second step portion , to close the opening portion provided in the case for recording and reproducing information. The stepped portion is formed in a direction not parallel to the opening and closing movement direction of the shutter member.

Therefore, in the eighth aspect of the present invention, the stepped portion of the other shutter member cannot be supported by the one shutter member like the fifth aspect of the present invention, however, the stepped portions of the pair of shutter members can be opposite and close to each other.

Description of drawings

FIG. 1 is a perspective view of a recording medium cartridge viewed from the upper surface side;

Fig. 2 is a perspective view of the recording medium cartridge seen from the lower surface side (closed state of the shutter);

Fig. 3 is a perspective view of the recording medium cartridge seen from the lower surface side (open state of the shutter);

Figure 4 is an exploded perspective view of Figure 1;

Figure 5 is an exploded perspective view of Figure 2;

Figure 6 is a perspective view of the inner rotor;

Fig. 7 is a perspective view of a state where the shutters overlap each other;

Fig. 8 is a sectional view along line A-A among Fig. 7;

Figure 9 is a perspective view of a closed shutter member viewed from the upper surface side;

Figure 10 is a perspective view of the closed shutter member viewed from the side of the lower surface;

Figure 11 is a perspective view of the opened shutter member viewed from the upper surface side;

Figure 12 is a perspective view of the opened shutter member viewed from the side of the lower surface;

Fig. 13 is an enlarged plan view of main parts before the shutter member is closed;

Fig. 14 is an enlarged plan view of main parts after the shutter member is closed;

15 is a perspective view of a state in which a shutter member is connected to an inner rotor to open an opening portion;

16 is a perspective view of a state in which a shutter member is connected to an inner rotor to close an opening portion;

17 is a plan view of the inner surface side of the upper housing;

18 is a plan view of the inner surface side of the lower housing;

19 is a plan view of a state where the inner rotor is connected to the lower housing so as to align with each other the positions of the opening portions of the two components;

20 is a plan view of a state where the inner rotor is connected to the lower case to move the positions of the opening portions of the two parts to each other;

Fig. 21 is an exploded perspective view of the shutter driving mechanism;

Fig. 22 is a bottom view of the main part of the box, showing a state where the shutter is closed from the lower surface side;

Fig. 23 is a bottom view of the main part of the box, showing a state where the shutter is opened from the lower surface side;

24 is a perspective view of an information recording medium recording and reproducing apparatus;

Fig. 25 is an explanatory diagram showing the operational relationship between the box body and the shutter mechanism and the state where the opening portion is completely closed by the shutter member;

Fig. 26(A) is a cross-sectional view of a state where the rising protrusion of the inner rotor is fitted to the rising protrusion of the upper casing;

26(B) is a cross-sectional view of a state where the rising protrusion of the inner rotor is separated from the rising protrusion of the upper case;

Fig. 27 is an explanatory diagram showing the state in which the inner rotor is rotated from the state shown in Fig. 25 to the state in which the pair of shutter members are half-opened;

FIG. 28 is an explanatory view showing the state in which the inner rotor is further rotated from the state shown in FIG. 27 to fully open the pair of shutter members;

29 is a perspective view of an opened shutter member on the upper surface side of another embodiment;

30 is a perspective view of a closed shutter member on the lower surface side of another embodiment;

31 is a perspective view of a conventional recording medium cartridge from the lower surface side (closed state of the shutter);

Fig. 32 is a perspective view of a conventional recording medium cartridge from the lower surface side (open state of the shutter);

Fig. 33 is a sectional view showing problems of a conventional recording medium cartridge;

FIG. 34 is a perspective view in which a common shutter member is opened, viewed from the side of the lower surface;

Fig. 35 is the perspective view that the usual shutter member is closed seen from the upper surface side;

Fig. 36 is the perspective view that the usual shutter member is seen from the lower surface side;

Fig. 37 is an enlarged plan view of main parts before a usual shutter member is closed;

Fig. 38 is an enlarged plan view of main parts after the usual shutter member is closed.

Detailed ways

Now, the recording medium cartridge of the present invention is described in order by being divided into the following parts: (1) the structure and operation of the main part of the recording medium cartridge, (2) the structure of the shutter, (3) the structure of the case body, (4) ) structure of information recording medium, (5) structure of inner rotor, (6) structure of shutter driving mechanism, (7) method of assembling recording medium cartridge, (8) handling of recording medium cartridge, and (9) others specific implementation.

(1) Structure and operation of the main part of the cartridge recording medium

Fig. 1 is a perspective view of a recording medium cartridge viewed from an upper surface side. Fig. 2 is a perspective view of the recording medium cartridge viewed from the lower surface side. Fig. 3 is a perspective view of a state in which the shutter is opened. Fig. 4 is an exploded perspective view. Fig. 5 is an exploded perspective view of the reverse state.

As shown in FIGS. 1 to 5 , a recording medium cartridge 1 includes an information recording medium 3 , an inner rotor 4 and a shutter 5 housed in a stacked state in a cartridge body 2 . When the inner rotor 4 is rotated, the shutter 5 is in a first position (see FIG. 2 ) for closing the opening portion 6 provided in the case body 2 and a second position for opening the opening portion 6 by the shutter driving mechanism 7. (See Figure 3) to move between.

As shown in FIG. 6 , on the overlapping surfaces of the inner rotor 4 and the shutter 5 , a plurality of first ribs 81 . . . 81 for reducing the contact area of the inner rotor 4 and the shutter 5 are provided. The height of the first ribs 81...81 is greater than 0 and not greater than 0.05 mm.

The plurality of first ribs 81 . . . 81 are formed substantially concentrically along the rotation locus of the shutter 5 .

The end portion of the first ribs 81 . The second rib 82 of the gap G1.

As shown in FIG. 7 , on the upper surface of the inner rotor 4 , the shutters 5 are stacked via first ribs 81 . . . 81 and second ribs 82 . Furthermore, as shown in FIG. 8 , between the inner rotor 4 and the shutter 5 , a gap G2 having substantially the same height as the first ribs 81 . . . 81 and the second rib 82 is formed.

A height not greater than 0.05mm can meet the requirements, so as to suppress the gap formed between the inner rotor and the valve to the minimum as required. A height of not less than 0.05 mm is not preferable because dust or the like may enter the gap. In addition, in order to reduce the frictional resistance generated between the shutter and the inner rotor and move the shutter smoothly when the shutter is moved, the height of the rib must be greater than 0.

The shutter 5 includes a pair of semicircular shutter members 5a and 5b. As shown in FIG. 2 , when the shutter is at the first position for closing the opening portion 6 , the chord sides 5 c of the pair of shutter members 5 a and 5 b overlap each other in the opening portion 6 to close the opening portion 6 . In addition, as shown in FIG. 3, when the shutter is in the second position for opening the opening portion 6, the pair of shutter members 5a and 5b have the chord sides 5c overlapping with the lower portions of the edges 6a and 6b of the opening portion 6 to open the opening portion 6.

When the chord sides 5c of the pair of shutter members 5a and 5b overlap each other, as shown in FIG. The portion 50 is continuously connected to the first overlapping portion 51a of the other shutter member 5b. As shown in FIG. 10, on the lower surface side of the pair of shutter members 5a and 5b, the second overlapping portion 51b of the one shutter member 5a is continuously connected to the second overlapping portion 51b of the other shutter member 5b through a second stepped portion 52. overlapping portion 51b.

The first stepped portion 50 exposed on the upper surfaces of the pair of shutter members 5a and 5b and the second stepped portion 52 exposed on the lower surfaces of the pair of shutter members 5a and 5b do not vertically overlap each other. Specifically, as shown in FIG. 12, in the one shutter member 5a, the second stepped portion 52 exposed on the lower surface of the pair of shutter members 5a and 5b is shifted, and its position is higher than that exposed on the pair of shutter members 5a. The position of the first stepped portion 50 of the upper surface of the shutter member 5b is closer to the first overlapping portion 51a side of the one shutter member 5a. In the other shutter member 5b, the second stepped portion 52 exposed on the lower surface of the pair of shutter members 5a and 5b is shifted from the first stepped portion exposed on the upper surface of the pair of shutter members 5a and 5b. The position of the stepped portion 50 is closer to the side of the second overlapping portion 51b. Therefore, the second stepped portion 52 is supported by one end portion of the first overlapping portion 51a of the one shutter member 5a, and the first stepped portion 50 is supported by one end portion of the second overlapping portion 51b of the other shutter member 5b. .

Further, as shown in FIG. 13, a first stepped portion 50 and a second stepped portion 52 are formed at a prescribed inclination angle θ with respect to the opening and closing movement directions (directions indicated by arrow marks A-B) of the shutter members 5a and 5b, respectively. Therefore, the first stepped portion 50 and the second stepped portion 52 are formed in a direction not parallel to the opening and closing directions of the shutter members 5a and 5b. The inclination angle θ is set within a range of 20 degrees to 60 degrees.

Therefore, when the pair of shutter members 5a and 5b move close to each other, the first step portion 50 and the second step portion 52 of the pair of shutter members 5a and 5b are not completely separated from each other as in a conventional recording medium cartridge. Overlapping lateral movement. The first stepped portion 50 and the second stepped portion 52 of the pair of shutter members 5a and 5b are opposed to and close to each other. Finally, as shown in FIG. 14 , the first stepped portion 50 and the second stepped portion 52 of the pair of shutter members 5 a and 5 b contact each other.

(2) The structure of the valve

As shown in FIGS. 11 and 12, the pair of shutter members 5a and 5b are formed by substantially semicircular flat plate members having substantially the same shape and size. In a substantially central portion of the chord side 5c of each of the shutter members 5a and 5b, a first stepped portion 50 is formed at a prescribed angle θ with respect to the opening and closing directions of the shutter member. On one side portion of the first stepped portion 50 as an edge, a first roof-shaped overlapping portion 51a is formed by a concave portion 50a provided on the rear surface side of the shutter members 5a and 5b. On the other side portion, a second roof-shaped overlapping portion 51b is formed by the recessed portion 50b in the front surface side of the shutter members 5a and 5b. Then, when the chord sides 5c of the pair of shutter members 5a and 5b overlap each other, as shown in FIGS. On, ie, offset from, the second stepped portion 52 of the lower surfaces of the shutter members 5 a and 5 b. Therefore, the second stepped portion 52 is supported by an end portion of the first overlapping portion 51a of a shutter member 5a. The first stepped portion 50 is supported by the second overlapping portion 51b of the other shutter member 5b.

In addition, as shown in FIGS. 13 and 14, a first step portion 50 and a second step are formed at an inclination angle θ of 45 degrees with respect to the opening and closing movement directions (directions shown by arrow marks A-B) of the shutter members 5a and 5b, respectively. Section 52. Therefore, when the pair of shutter members 5a and 5b move in the opening and closing directions, the gap in the direction of switch movement and the gap substantially perpendicular to the direction of opening and closing movement are in the step portions 50 of the pair of shutter members 5a and 5b. Gradually reduce by essentially the same amount. Then, finally as shown in FIGS. 9 and 10 , the second overlapping portion 51b of the other shutter member 5b is overlapped below the first overlapping portion 51a of the one shutter member 5a. The first overlapping portion 51a of the other shutter member 5b is overlapped on the second overlapping portion 51b of the one shutter member 5a.

The pair of shutter members 5a and 5b are formed as flat plate members whose thickness is substantially the same as that of the first to fourth height portions 20d to 20g (see FIG. 18 ) of the rib-shaped protruding portion 20a provided on the lower housing. 22 on the peripheral edge of the opening portion 6 .

As shown in FIG. 9, each of the pair of shutter members 5a and 5b includes a shaft receiving portion 8b and a groove 9 into which the shaft portion 8a provided in the inner rotor 4 is inserted to form a pivot portion as described below. 8. The drive shaft portion 10 (see FIG. 4 ) provided in the inner surface of the lower housing 22 is inserted into the groove 9 . The groove 9 is formed so as to extend in the radial direction with respect to the shaft receiving portion 8b of the shutter members 5a and 5b, in which direction the groove 9 is provided as the center. At the outer end portions of the grooves 9 , elastic pieces 54 formed by cutting their peripheries and recessed portions 53 are provided for placing the convex-shaped drive shaft portions 10 . Furthermore, in the arcuate sides of the shutter members 5a and 5b, projecting pieces 55 for closing are provided. The shaft fixing portion 50c near the end portion of the first overlapping portion 51a in the shutter members 5a and 5b provides the shaft receiving portion 8b.

In the end portion of the second overlapping portion 51b of the shutter members 5a and 5b, a cutout portion 50d is provided for introducing the second height portion 20e or the fourth height portion 20g provided at the end portion of the rib-shaped protrusion portion 20a, the protrusion portion 20 a is provided in the peripheral edge portion of the opening portion of the lower housing 22 .

By fitting the shaft portion 8a on the flat portion 40 of the inner rotor 4 to the shaft receiving portion 8b, the shutter members 5a and 5b are respectively connected to the flat portion 40 of the inner rotor 4 so as to be freely rotatable. At this time, the pair of shutter members 5a and 5b are connected to the planar portion 40 of the inner rotor 4 with their chordal sides facing each other. As a result, as shown in FIG. 15, when the pair of shutter members 5a and 5b are rotated so as to be separated from each other outwardly, the shutter members 5a and 5b are respectively assembled so as to overlap on both side portions of the opening portion 42 of the inner rotor 4. , the opening portion 42 of the inner rotor 4 is located between the two shutter members. On the other hand, when the pair of shutter members 5a and 5b are respectively turned inwardly, their chordal sides 5c approach each other respectively. Therefore, as shown in FIG. 16, the opening portion 42 is closed by the pair of shutter members 5a and 5b.

While the shutter is closed, the protruding piece 55 of the shutter member 5a abuts against the first height portion 20d of the lower housing 22 as described below. The protruding piece 55 of the shutter member 5b abuts against the third height portion 20f of the lower housing 22 to close the gap between the protruding portions.

Further, on the sliding contact surfaces of the shutter members 5a and 5b with the lower housing 22, there are provided groove-shaped recessed portions 20b which engage with rib-shaped protrusion portions 20a provided on the peripheral edge portion of the opening portion of the lower housing 22 to A dust blocking portion is formed. When the shutter members 5a and 5b close the opening portion 42, the rib-shaped projecting portion 20a of the lower housing 22 is fitted into the groove-shaped recessed portion 20b.

(3) The structure of the box

As shown in FIG. 12 , the box body 2 includes an upper shell 21 and a lower shell 22 . The lower housing 22 is divided into a pair of right and left lower housing parts 23 and 24 . The opening portion 6 is provided between the pair of right and left lower housing members 23 and 24 .

The pair of right and left lower housing parts 23 and 24 forming the lower housing 22 has a pair of drive shaft portions 10 .

As shown in FIG. 17, the upper case 21 is constituted by a substantially square thin tray member having a circular arc form on its front surface side and has a peripheral wall 21a at its peripheral edge portion.

The peripheral wall 21a includes a front edge portion 21b, a pair of side edge portions 21c and 21d, and a rear edge portion 21e. In the central portion of the rear edge portion 21e, a positioning recessed portion 21f for positioning the upper case to the lower case 22 is provided.

Specifically, inside the peripheral wall 21a, at the corner portion of the front edge portion 21b and one side edge portion 21c, the corner portion of one side edge portion 21c and the rear edge portion 21e, and the rear edge portion 21e and the other side edge portion 21d In the corner portions of , arc-shaped convex ribs 14 are respectively provided.

Inside the arc-shaped rib 14, an annular rib 15 is provided. Inside the annular rib 15, a housing portion 16 for the information recording medium 3 is provided.

On the outside of the annular rib 15, there is provided an annular recessed portion 17 into which the tip of the annular portion of the inner rotor 4 is fitted, which will be described in detail below. On the bottom surface of the annular recessed portion 17, raised protrusions 18 for moving the inner rotor 4 to separate the inner rotor 4 from the lower housing 22 are provided at front and rear symmetrical positions (positions shifted by 180 degrees in phase). An inner rotor-side rising protrusion 46 provided on an end surface of an annular portion 41 of the inner rotor 4 described later is mounted on the rising protrusion 18 . Therefore, the rising protrusion portion 18 is used to separate the inner rotor 4 from the upper casing 21 .

As shown in FIG. 18 , the lower housing 22 is divided into two parts having the pair of right and left lower housing members 23 and 24 by the central opening portion 6 . The lower case 22 is constituted by a substantially square thin tray member having a circular arc form similar to the upper case 21 on its front surface side and has a peripheral wall 22a at its peripheral edge portion.

The peripheral wall 22a includes a front edge portion 22b, a pair of side edge portions 22c and 22d, and a rear edge portion 22e. In the rear edge portion 21e, a positioning protrusion portion 22f for positioning the lower case to the upper case 21 is provided.

Specifically, inside the peripheral wall 22a, at the corner portion of the front edge portion 22b and one side edge portion 22c, the corner portion of one side edge portion 22c and the rear edge portion 22e, and the rear edge portion 22e and the other side edge portion 22d In the corner portions of , arc-shaped convex ribs 19 are respectively provided.

Inside the arc-shaped rib 19 of the lower housing 22, there is provided a housing portion in which substantially half of the inner rotor 4 in the thickness direction and the pair of shutter members 5a and 5b are accommodated.

The upper and lower housings 21 and 22 overlap each other in such a way that their peripheral walls 21a and 22a abut each other when the positioning protrusion portion 22f is fitted to the protrusion recess portion 21f.

The opening part 6 provided in the central part of the lower housing 22 includes an opening part 6a and a central opening part 6b, the opening part 6a is used for recording/reproducing information, and the turntable of the information recording medium and the drive mechanism and the optical head of the optical pickup device are allowed to face For the information recording medium 3, the turntable of the information recording medium rotation and driving mechanism faces the central opening portion 6b.

2 and 3, in substantially central portions of the other side edge portions 21d and 22d of the upper and lower casings 21 and 22, an opening window 30 is provided for exposing a part of the gear 43 to the inner rotor 4. on the peripheral surface. The opening window 30 is formed by an upper case side cutout portion 30 a provided in the upper case 21 and a lower case side cutout portion 30 b provided in the lower case 22 . Further, in the other side edge portions 21d and 22d of the upper and lower housings 21 and 22, guide grooves 31 extend forward and rearward along the connecting surface. A guide groove 31 is provided for preventing erroneous insertion when the recording medium cartridge 1 is mounted on an information recording medium recording and reproducing apparatus. The guide groove 31 communicates with the opening window 30 .

As shown in FIG. 4, in the corner portion of the front edge portion 22b and the other side edge portion 22d of the lower housing 22, a locking member accommodating portion 33 is provided for accommodating the locking member 33 so as to be freely rotatable. The locking member accommodating portion 33 communicates with an accommodating portion of an inner rotor or the like of the lower housing 22, and communicates with the guide groove 31 through an opening 34 provided on the other side edge portion 22d. Further, in the lock member accommodating portion 33 of the lower housing 22 , a support shaft 35 for supporting the lock member 32 to freely rotate protrudes toward the upper housing 21 side.

The lock member 32 is formed of a rod-shaped member, which is mounted to the support shaft 35 to freely rotate and swing in the planar direction. In one end portion in the longitudinal direction of the locking member 32, a detent portion 36 having a plurality of teeth is provided. In the other end in the longitudinal direction of the lock member 32, an operation portion 37 is provided. Further, in the lock member 32 , a spring piece 38 protruding in the same direction as opposed to the detent portion 36 is integrally provided.

The lock member 32 is mounted on the support shaft 35 with the stopper portion 36 directed toward the receiving portion of the inner rotor or the like, and the spring piece 38 abuts against the inner surface of the front edge portion 22b. The braking portion 36 is pushed toward an accommodating portion of the inner rotor or the like by the elastic force of the spring plate 38 , and the operating portion 37 protrudes into the guide groove 31 from the inside through the opening 34 . In addition, on the erroneous erasure preventing member connection portion 91 provided at the corner portion of the one side edge portion 22c and the rear edge portion 22e of the lower case 22, a erroneous erasure preventing member 92 for preventing recording on the recording medium is connected. , such as erroneous erasure of information on an optical information recording medium.

(4) Structure of information recording medium

As the information recording medium 3, a ROM optical information recording medium, a write-once optical information recording medium, or a rewritable optical information recording medium has been known as an optical information recording medium capable of recording information. Various information signals, including music signals such as audio information or video signals and music signals such as video information; information signals such as audio information or video information can only be recorded once in a write-once optical information recording medium; rewritable optical information The information signal can be repeatedly recorded on the recording medium many times. In the present embodiment, an optical information recording medium capable of recording information (hereinafter, the information recording medium is simply referred to as an optical information recording medium) is used.

As shown in FIG. 4, the optical information recording medium 3 is formed as a thin disc-shaped recording member having a central hole 3a in its central portion.

The optical information recording medium 3 is clamped onto the turntable of the information recording medium recording and reproducing apparatus by the clamping plate 3c, and rotates at a prescribed speed in the direction of rotation (for example, constant angular velocity per zone: ZCAV), wherein the clamping plate 3c is clamped The tight plate pressing part 3 b is attached to the inner surface of the upper housing 21 .

On one surface of the optical information recording medium 3, an information recording area 29a capable of recording information and a non-recording area 29b not capable of recording information are provided, and the optical head of the optical pickup device in the recording and reproducing apparatus is opposite to the information recording area 29a. The non-recording area 29b includes an inner non-recording area 29b having a specified width outside the central hole 3a of the central portion of the optical information recording medium 3 and an outer non-recording area 29b where the optical information is recorded. The peripheral edge of the medium 3 has a specified width. An information recording area 29a is provided between the inner and outer non-recording areas 29b and 29b.

The optical information recording medium 3 is housed in an annular portion 41 of the inner rotor 4 described below so as to freely rotate. For example, as the base material of the optical information recording medium 3, synthetic resins such as polycarbonate (PC), polymethacrylate (PMMA), and the like are preferable. However, it should be understood that other synthetic resins and various materials other than synthetic resins, such as glass materials, aluminum alloys, etc., may also be used.

The information recording medium is not limited to the optical information recording medium, and may also be a magnetic information recording medium, a magneto-optical information recording medium, and other storage media. In the magnetic information recording medium, a magnetic thin film layer is formed on the surface of a thin disk to be used according to a specific position. The magnetization state stores information; in the magneto-optical information recording medium, information is written or read on the magnetic thin film layer formed in the same way by using an optical head and a magnetic head.

(5) The structure of the inner rotor

As shown in FIG. 4 , the inner rotor 4 includes a planar portion 40 formed of a disc-shaped thin plate member and an annular portion 41 continuously provided on the peripheral edge of the planar portion 40 . Then, as described above, on the upper surface of the planar portion 40 of the inner rotor 4, the first ribs 81...81 and the second ribs 82 are provided.

An opening portion 42 is formed at the center portion of the planar portion 40 of the inner rotor 4 . On the lower surface side (surface opposite to the annular portion 41), a pair of shaft portions 8a forming the pivot portion 8 of the shutter driving mechanism 7 are provided. The pair of shaft portions 8 a are provided at substantially point-symmetrical positions with respect to the opening portion 42 .

The opening portion 42 includes an opening portion 42a and a central opening portion 42b, and the opening portion 42a is used for recording/reproducing information, allowing the rotation of the information recording medium and the turntable of the driving mechanism and the optical head of the optical pickup device to face the information recording medium 3, similar to the lower case 22 of the opening portion 6, the turntable of the information recording medium rotation and driving mechanism faces the central opening portion 42b.

As shown in FIG. 5 , the annular portion 41 is formed into a cylindrical shape with a diameter slightly larger than the outer diameter of the annular rib 15 provided in the inner surface of the upper casing 21, and the annular portion 41 is fitted to the periphery of the annular rib 15 to rotate freely. An end portion of the annular portion 41 is inserted into an annular concave portion 17 provided outside the annular rib 15 .

On the peripheral surface of the ring portion 41, there is provided a gear portion 43 having many teeth covering a prescribed range in the circumferential direction. The gear portion 43 is set within an angle range slightly larger than the rotation angle of the inner rotor 4 . That is, as shown in FIG. 20, when the opening portion 42 of the inner rotor 4 is inclined to the maximum angle with respect to the opening portion 6 of the lower housing 22 so that the pair of shutter members 5a and 5b are completely closed as described below , one end of the gear portion 43 in the circumferential direction is positioned (exposed) at one end of the opening window 30 . The protrusion engaging the recessed portion 44 provided in the detent portion 44a is positioned (exposed) at the center of the opening window 30 as described below. Further, as shown in FIG. 19, when the inner rotor 4 is rotated by a prescribed angle so that the opening portion 42 overlaps the opening portion 6 to fully open the pair of shutter members 5a and 5b, the other end of the gear 43 in the circumferential direction is Positioned (exposed) in the open window 30 .

On both sides of the gear portion 43 of the inner rotor 4 , stopper portions 44 a and 44 b for restricting the amount of rotational movement of the inner rotor 4 protrude outward in the radial direction.

Since the gear portion 43 and the stop portions 44a and 44b protrude outward from the peripheral surface of the annular portion 41 in this manner, grooves 45a and 45b are provided respectively to avoid contact with the stop portions 44a and 44b, allowing them to pass through the upper casing. 21 and the corresponding part of the lower shell 22.

As shown in FIG. 19, when the opening portion 42 of the inner rotor 4 overlaps the opening portion 6, one end portion of the stopper portion 44a engages with the stopper engaging portion 45c provided in one end portion of the groove 45a to prevent the inner rotor 4 from opening. Further rotation of the rotor 4.

In addition, as shown in FIG. 20, when the opening portion 42 of the inner rotor 4 is inclined to the maximum angle with respect to the opening portion 6 of the lower housing 22, one end portion of the braking portion 44b is in contact with the end portion of the opening portion 6 provided in the The brake engaging portion 45d is engaged to prevent further rotation of the inner rotor 4 .

Further, in the end face of the annular portion 41 , rising protrusion portions 46 are provided at two positions in the circumferential direction. As shown in FIG. 20, when the opening portion 42 of the inner rotor 4 is inclined to the maximum angle with respect to the opening portion 6 of the lower casing 22, the rising protrusion portion 46 on the inner rotor side is fitted in the annular concave portion 17 of the upper casing 21 to provide On the raised protruding portion 18, as shown in Fig. 26(A).

As shown in FIG. 5, in the vicinity of the pair of shaft portions 8a and 8a, there are provided trapezoidal mounting release projection portions 48 and 48 whose height is the same as that of the rib-shaped projection portion 20a (see FIG. 4) provided in the lower housing 22. basically the same. When the shutter members 5a and 5b are moved from the position for closing the opening portion 6 (first position) shown in FIG. 20 to the position for opening the opening portion 6 (second position) shown in FIG. The protruding portions 48 and 48 are used to pull out the rib-shaped protruding portion 20a from the groove-shaped recessed portion 20b of the pair of shutter members 5a and 5b, which will be described later.

Trapezoidal mounting release protrusion portions 48 and 48 are located at side portions of the second and fourth height portions 20e and 20g, and the second and fourth height portions 20e and 20g are located at end portions of the rib-shaped protrusion portion 20a in the position shown in FIG. place.

(6) The structure of the valve drive mechanism

FIG. 21 is an exploded perspective view of the shutter driving mechanism 7. As shown in FIG. The shutter drive mechanism 7 includes a pivot portion 8, a slot 9 and a drive shaft portion 10. The pivot portion 8 is used to connect the shutter 5 to the inner rotor 4 so that it can rotate freely. Formed on the shutter 5, the drive shaft part 10 is located in the inner surface of the lower casing 22 of the box body 2, and is inserted in the slot 9, and when the inner rotor 4 is rotated, the drive shaft part 10 moves in the slot 9 to pivot The shaft portion 8 pivots the shutter 5 as a center. The pivot portion 8 includes a shaft portion 8 a provided in the inner rotor 4 and a shaft receiving portion 8 b provided in the shutter 5 .

Then, as shown in FIG. 22, when the inner rotor 4 is rotated in one direction (counterclockwise in FIG. 22) from the state where the shutter 5 is located at the first position for closing the opening portion 6 provided in the case body 2, The shutter 5 rotates around the pivot portion 8 by means of the groove 9 and the drive shaft portion 10 forming the shutter driving mechanism 7 to move to the second position for opening the opening portion 6 provided in the case body 2, as shown in FIG. 23 . Conversely, when the inner rotor 4 is rotated in the other direction (clockwise in FIG. 23 ), the shutter 5 is rotated and moved to the first opening portion 6 for closing the opening portion 6 provided in the case body 2 by the shutter driving mechanism 7. a location.

(7) Method of Assembling a Cassette Recording Medium

Now, an example of a method of assembling the recording medium cartridge 1 will be described by referring to FIG. 5 .

First, in the central portion of the inner surface of the upper housing 21, the clamping plate 3c and the clamping plate pressing member 3b are fixed. Then, on the information recording medium accommodating portion 16 at the center of the upper housing 21, the optical information recording medium 3 is mounted.

Then, the annular portion 41 of the inner rotor 4 is fitted to the outside of the annular rib 15 of the upper case 21 so as to cover the optical information recording medium 3 . Therefore, the optical information recording medium 3 is housed between the inner rotor 4 and the upper housing 21 so as to freely rotate. Meanwhile, the extending direction of the opening portion 42 of the inner rotor 4 coincides with the front-rear direction of the upper casing 21 . One end of the gear 43 faces the opening window 30 .

Then, the shutter 5 is connected to the inner rotor 4 . Chord sides of the pair of shutter members 5a and 5b are opposed to each other. In this state, the support shaft 8a on the planar portion 40 of the inner rotor 4 is fitted to the shaft receiving hole 8b. Then, the shutter members 5 a and 5 b are separately separated from each other and superimposed on both side portions of the opening portion 42 of the inner rotor 4 . Simultaneously, or before or after the above operation, the lock member 32 is connected to the support shaft 35 of the lock member accommodating portion 33 . At this time, the spring piece 38 of the lock member 32 is allowed to abut against the inner surface of the front edge portion 21 a of the upper housing 21 . Under the elastic force of the spring piece 38 , the operation portion 37 is allowed to protrude from the opening portion 34 into the guide groove 31 .

Then, the inner rotor 4 including the shutter 5 is covered by the lower case 22 , and the lower case 22 overlaps the upper case 21 . At this time, the pair of shutter members 5a and 5b are aligned at the above-mentioned positions so that the pair of protrusion-shaped protrusions 10 and 10 provided in the lower housing 22 can be opposed to the pair of grooves 9 and 9, respectively. Therefore, the lower housing 22 merely overlaps the upper housing 21 regardless of the positions of the pair of grooves 9 and 9 so that the pair of protrusion-shaped protrusions 10 and 10 can engage with the pair of grooves 9 and 9 .

After that, the lower case 22 is tightened and fixed to the upper case 21 using a plurality of fixing screws. Thus, the assembling work of the recording medium cartridge 1 is completed.

(8) Handling of cartridge recording media

Now, the operation of the recording medium cartridge, and the structure of the information recording medium recording and reproducing apparatus will be described.

As shown in FIG. 24 , the information recording medium recording and reproducing apparatus 60 includes an outer casing 61 and a recording and reproducing apparatus main body (example is omitted) or the like housed in the outer casing 61 . The outer package case 61 comprises a case main body 62, a case cover part 63 and a front panel 64, the case main body 62 has an upper surface and an open front surface, and the case cover part 63 is detachably connected to the upper part to close the upper surface of the case main body 62, A front panel 64 is detachably connected to the front to close the front surfaces of the case main body 62 and the case cover member 63 .

At four portions of the case main body 62 , leg members 62 a protrude downward. These leg members 62a support the information recording medium recording and reproducing device 60 . The front panel 64 is made of a laterally elongated flat member. In the upper part of the front panel 64, transversely elongated cassette inlet and outlet portions 65 are provided. The cartridge inlet and outlet portions 65 are formed to have substantially the same size as the front surface of the cartridge 1 . The cassette inlet and outlet portions 65 are normally closed by a switch door 66 provided therein.

The opening and closing door 66 is pressed by the front of the recording medium cartridge 1 to insert the cartridge 1 to a designated position. Therefore, the recording medium cartridge 1 is automatically taken in by a loading mechanism not shown in the figure. In the information recording medium recording and reproducing apparatus 60, the recording medium cartridge 1 conveyed by the loading mechanism is positioned and mounted to a designated position. Simultaneously, or before or after the above-mentioned operations, the pair of shutter members 5 a and 5 b are operated by a shutter switch mechanism provided in the information recording medium recording and reproducing apparatus 60 to open the opening portions 6 and 42 .

The above operation will be described in more detail. When the cartridge-type information recording medium 1 is inserted into a designated position, as shown in FIG. The guide groove 31. Accordingly, the operation portion 37 of the lock member 32 protruding to the guide groove 31 is pressed into the lock member accommodating portion 33 against the urging force of the spring piece 38 under the pressure of the rack bar 70 . Accordingly, the locked state of the inner rotor 4 by the lock member 32 is released. The rotation operation protrusion 70c provided in the rack bar 70 is engaged with the protrusion engaging recess portion 44 provided in the inner rotor 4 through the elastic piece 70b to rotate the inner rotor 4 . In addition, the rack bar 70 relatively moves forward so that the tip of the rack portion 70 a thereof meshes with the gear portion 43 of the inner rotor 4 .

The gear portion 43 meshes with the rack portion 70 a of the rack bar 70 , so the inner rotor 4 is rotated according to the amount of movement of the rack bar 70 .

FIG. 25 shows the state before the rack portion 70a of the rack bar 70 meshes with the gear portion 43 of the inner rotor 4. As shown in FIG. In this state, the protrusion connecting portion 50a and the recess connecting portion 50b of the pair of shutter members 5a and 5b approach each other so as to be in close contact with each other. At this time, the opening portion 42 of the inner rotor 4 is positioned at a position inclined to the opening portion 6 of the lower casing 22 . Therefore, only the central portion where the two opening portions 6 and 42 overlap is opened, however, the opening portion is closed by the pair of shutter members 5a and 5b. Therefore, there is no fear of entry of dust and the like into the information recording medium accommodating portion from the overlapping portion of the opening portions 6 and 42 .

Further, in a portion of the opening portion 6 close to the opening portion 42 at an acute angle, a shaft connecting portion 50c of the pair of shutter members 5a and 5b is provided. These shaft connection portions 50c are located inside the second and fourth height portions 20e and 20g of the rib-shaped protrusion portion 20a to eliminate gaps. Furthermore, on the inner side of the first and third height portions 20d and 20f, a protruding piece 55 for closing is provided to eliminate a gap. Further, the groove 9 provided in the pair of shutter members 5 a and 5 b is closed by the lower housing 22 on which the pair of shutter members 5 a and 5 b are stacked. Further, a rib-shaped protrusion portion 20a is fitted to a groove-shaped recessed portion 20b provided in the shutter members 5a and 5b, and the rib-shaped protrusion portion 20a is provided in an outer edge portion of the opening portion of the lower housing 22 to surround the opening portion 6. Therefore, a crank-shaped dust preventing portion is formed in order to prevent dust from entering the information recording medium accommodating portion through the opening portions 6 and 42 .

In this state, when the rack bar 70 enters the guide groove 31 corresponding to the insertion operation of the recording medium cartridge 1 to start the engagement of the rack portion 70a with the gear portion 43 of the inner rotor 4, the inner rotor 4 is rotated clockwise. In this case, as shown in FIGS. 25 and 26(A), in an initial state in which the inner rotor 4 starts a rotational operation, the rising protrusion 46 of the inner rotor 4 is fitted to the rising protrusion 18 of the upper case 21 to The pair of shutter members 5a and 5b are supported between the inner rotor 4 and the lower casing. The rotational operation of the inner rotor 4 requires a relatively large force. The inner rotor 4 is rotated against a large frictional force generated by the state in which the rising protrusions 18 and 46 are fitted to each other. Therefore, as shown in FIG. 26(B), the engagement between the raised protrusion portions 18 and 46 is released to eliminate the frictional force. Therefore, the subsequent turning operation of the inner rotor 4 can be performed extremely smoothly.

When in accordance with the rotation of the inner rotor 4, the trapezoidal mounting release protrusions 48 and 48 provided in the bottom surface of the inner rotor 4 are fitted to the first and third height portions 20d and 20f of the rib-shaped protrusion 20a of the lower housing 22, The inner rotor 4 is thus lifted from the lower housing 22 . The shutter members 5a and 5b are also raised, so that the groove-shaped recessed portion 20b is pushed out from the rib-shaped projected portion 20a.

Then, when the inner rotor 4 is further rotated, the shutter members 5a and 5b are half-opened from the state shown in FIG. 25, as shown in FIG. Then from the state shown in FIG. 27, the shutter members 5a and 5b move to both sides of the opening portion 42 of the inner rotor 4, respectively, as shown in FIG. Therefore, the opening portions 6 and 42 are fully opened. When the shutter members 5a and 5b move in accordance with the rotation of the inner rotor 4, the first ribs 81...81 and the second ribs 82 suppress the frictional force between the inner rotor 4 and the shutter members 5a and 5b. Therefore, the shutter members 5a and 5b are moved smoothly.

Then, when the opening portions 6 and 42 are fully opened, a part of the optical disc 3 accommodated in the information recording medium accommodating portion is exposed by the opening portions 6 and 42 . Then, the recording and reproducing apparatus main body 62 reproduces or records the information signal.

After the information signal is reproduced or recorded, a cartridge eject button (not shown) provided in the information recording medium recording and reproducing apparatus 60 is operated so that the cartridge type recording medium 1 is ejected from the information recording medium recording and reproducing apparatus 60 by the operation of the loading mechanism. pop up.

(9) Other specific implementation methods

In the specific embodiments described above, the first ribs 81 . . . 81 and the second ribs 82 are provided in the inner rotor 4 . However, only the first ribs 81 . . . 81 may be provided in the inner rotor 4 . Furthermore, first ribs 81...81 and second ribs 82 may be provided in the shutter members 5a and 5b. As long as it can suppress the frictional force generated between the inner rotor 4 and the shutter members 5a and 5b, or prevent dust or the like between the first ribs 81 and 81 from entering the opening side, any number or form of first Ribs 81 . . . 81 and a second rib 82 .

In addition, in the above-mentioned embodiment, as shown in FIGS. 11 and 12, the second step portion 52 is supported by an end portion of the first overlapping portion 51a of one shutter member 5a, and the first step portion 50 is supported by the other shutter member. The second overlapping portion 51b of 5b is supported. However, as shown in FIGS. 29 and 30, the first stepped portion 50 may be supported by an end portion of the second overlapping portion 51b of one shutter member 5a, and the second stepped portion 52 may be supported by the first overlapping portion of the other shutter member 5b. 51a supports. Furthermore, according to the above-mentioned embodiment, in the recording medium cartridge, the pair of shutter members 5a and 5b are moved to open or close by rotating the inner rotor 4. However, the recording medium cartridge may not use the inner rotor 4 to move the shutter members 5a and 5b in the switching direction.

The recording medium cartridge according to the present invention has advantages as described below.

(1) According to the present invention, since the first rib for reducing the contact area between the shutter and the inner rotor is provided on the overlapping surface of the shutter and the inner rotor, the gap between the shutter and the inner rotor when moving the shutter can be reduced. The friction generated between them allows the valve to move smoothly.

(2) According to the present invention, the first rib is formed with a height exceeding 0 and not higher than 0.05 mm. Therefore, the gap formed between the inner rotor and the shutter can be suppressed to a minimum as desired. Therefore, entry of dust or the like into the gap can be suppressed.

(3) According to the present invention, since a plurality of ribs are formed on the surface of the inner rotor along the rotation locus of the shutter, even when the shutter is positioned at the first position for closing the opening portion, or even when the shutter is positioned at In the second position for opening the opening portion, the shutter can also be in contact with the first rib.

(4) According to the present invention, since the second rib for closing the gap between the plurality of first ribs is formed along the peripheral edge portion of the opening portion at the end portion of the first rib of the opening portion, even when When dust or the like is present between the plurality of first ribs, it is also possible to prevent dust or the like from entering the opening side.

(5) According to the present invention, when the pair of shutter members are closed, the stepped portion can be reinforced by a simple method of changing the position of the first stepped portion exposed on the front surface of the shutter member from the position of the first stepped portion exposed on the rear surface. The position offset of the second step part.

(6) According to the present invention, the stepped portions of the pair of shutter members do not move completely in the lateral direction to overlap each other as in a conventional recording medium cartridge. The stepped portions of the pair of shutter members are opposed and close to each other. Therefore, when the stepped portions are allowed to approach each other, the stepped portions of the pair of shutter members are prevented from interfering with each other while allowing the stepped portions of the pair of shutter members to come into close contact with each other.

(7) According to the present invention, the stepped portion is formed at an inclination angle of about 45 degrees with respect to the direction of opening and closing movement of the shutter member. When the pair of shutter members is moved to open and close, the gap in the opening and closing directions and the gap in a direction substantially perpendicular to the opening and closing movement directions are reduced by substantially the same amount. Eventually, the stepped portions of the pair of shutter members come into close contact with each other.

(8) According to the present invention, since the stepped portions of the pair of shutter members are opposed and close to each other, the stepped portions of the pair of shutter members can avoid mutual interference, while allowing the pair of shutter members to The stepped portions of the slabs are in close contact with each other.

In summary, the present invention provides a recording medium cartridge comprising information recording media accommodated in a stacked state in a cartridge body, an inner rotor, and a shutter. When the inner rotor is rotated, the shutter overlapped on the inner rotor is in use. Moves between a first position for closing an opening portion provided in the case and a second position for opening the opening portion, wherein a contact area for reducing the contact area between the shutter and the inner rotor is provided on the overlapping surface of the shutter and the inner rotor. the first rib.

Wherein the first convex rib is formed with a height exceeding 0 and not higher than 0.05 mm.

Wherein a plurality of first convex ribs are formed on the surface of the inner rotor along the rotation track of the valve.

Wherein an end portion of the first rib in the opening portion, a second rib for closing a gap between the plurality of first ribs is formed along a peripheral edge portion of the opening portion.

According to another aspect of the present invention, there is provided a recording medium cartridge comprising: a pair of shutter members respectively including a first overlapping portion and a second overlapping portion formed by a step portion in a moving direction of the shutter member in a string side , wherein when the chord sides of the pair of shutter members overlap each other, the first overlapping portion of one shutter member exposed on the upper surface side of the pair of shutter members and the first overlapping portion of the other shutter member are continuously separated by the first stepped portion connected together, and the second overlapping portion of the one shutter member exposed on the lower surface side of the pair of shutter members and the second overlapping portion of the other shutter member are continuously connected in an overlapping state through the second step portion together to close an opening portion for recording and reproducing information provided in the case, wherein the first stepped portion exposed on the upper surface side of the shutter member does not overlap the first stepped portion exposed on the lower surface side of the shutter member. On the second step part.

Wherein the stepped portion is formed in a direction not parallel to an opening and closing movement direction of the shutter member.

Wherein the stepped portion is formed at an inclination angle of about 45 degrees with respect to the opening and closing movement direction of the shutter member.

According to still another aspect of the present invention, there is provided a recording medium cartridge comprising: a pair of shutter members respectively including a first overlapping portion and a second overlapping portion formed by a stepped portion in a moving direction of the shutter member in a string side , wherein when the chord sides of the pair of shutter members overlap each other, the first overlapping portion of one shutter member exposed on the upper surface side of the pair of shutter members and the first overlapping portion of the other shutter member are continuously separated by the first stepped portion are connected together, and the second overlapping portion of one shutter member exposed on the lower surface side of the pair of shutter members and the second overlapping portion of the other shutter member are continuously connected together in an overlapping state through the second step portion, to An opening portion provided in the case body for recording and reproducing information is closed, wherein the stepped portion is formed in a direction not parallel to an opening and closing movement direction of the shutter member.

Claims (3)

1. recording medium cartridge comprises:

A pair of shutter member, comprise first lap and second lap that on the moving direction of shutter member, partly form by first step part and second step respectively that are arranged in the string limit respectively, wherein when this string limit to shutter member overlaps each other, being exposed to this is linked together by the first step part continuously to first lap of a shutter member of shutter member upper surface side and first lap of another shutter member, and be exposed to this second lap of a described shutter member of shutter member lower face side and second lap of described another shutter member are linked together with overlapping state continuously by the second step part, so that being provided, being used to of providing in the box body write down opening portion with information reproduction, wherein being exposed to the described first step part of shutter member upper surface side partly is offset with described second step in the lower face side that is exposed to shutter member, and described second step part is supported by an end portion of first lap of a described shutter member, and described first step part is supported by an end portion of second lap of described another shutter member.

2. recording medium cartridge as claimed in claim 1 wherein is being not parallel to described first step part of formation and described second step part on the direction of opening and close moving direction of shutter member.

3. recording medium cartridge as claimed in claim 1, wherein the moving direction of opening and close with respect to shutter member forms described first step part and second step part into about 45 pitch angle of spending.

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