JP2003196947A - Small sized magnetic disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lessen deterioration of sharpness of a display indicating the type of a magnetic disk in a small sized magnetic disk cartridge, and to easily apply recycling process to the cartridge. <P>SOLUTION: In the magnetic disk cartridge 10, provided with a flexible magnetic disk 14 and a housing 12 for freely rotatably housing the magnetic disk 14, loadable on a card disk drive to be inserted into an electronic appliance, the surface of the housing 12 is embedded with an identification piece 18 enabling identification of the type of the magnetic disk 14. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is replaceable with a card-type disk drive that can be loaded into a card slot of an electronic device such as a digital still camera, a digital video camera, or a laptop computer. The present invention relates to a small magnetic disk cartridge that can be loaded. 2. Description of the Related Art Conventionally, various recording media are removably loaded in a card slot of an electronic device such as a digital still camera, a digital video camera, a notebook personal computer, and the like for recording and reproduction. . As such a recording medium, a semiconductor memory type, a hard disk type, an optical disk type, a small magnetic disk such as a floppy (registered trademark) disk, etc.
Various things are in practical use. Among them, the semiconductor memory is easy to handle and the recording capacity is suitably large, so it is the most popular but relatively expensive. Therefore, in a digital camera or the like using these memories, it is common to transfer the captured image data to a personal computer or the like, and then delete the data and use the recording medium repeatedly. As a hard disk type, 340
Those with a capacity of MB or 1 GB are known, but this is also expensive, and the data is transferred and stored elsewhere, and the recording medium is repeatedly used. The optical disk type has a large recording capacity for its size, and can record 256 MB of data in a size of 35 mm × 41 mm × 11 mm, for example.
A device with a recording capacity of 12 MB is also being realized. However, since the optical disk takes time to write, there is a drawback that the recording speed is slow. On the other hand, a magnetic disk such as a floppy (registered trademark) disk can be made as small as about 50 mm × 55 mm × 2 mm and can be exchanged into a disk drive of a size that can be inserted into a card slot of a personal computer or the like. Is also known, but this has a capacity of 40
It's as small as MB, and it has insufficient capacity in terms of recording camera images, and its size is not suitable for digital cameras. In recent years, digital cameras have been in conflict with the social background in which personal computers have become popular, such as ease of recording, improved image quality through the development of image sensors, possibility of data deletion and transfer, and large recording capacity. Thus, although it is rapidly widespread, recording media (hereinafter referred to as media) are limited in terms of price and capacity as described above, and thus there are limitations on the manner of use. For example, because the media is expensive, 1
As mentioned above, it is normal to use a single piece of media repeatedly, such as transferring to a computer and deleting it when the data is full, without having multiple pieces of media in one camera. It is. For this reason, there may be a shortage of recording media on the road, and it is not possible to store the media containing the data as it is or upload it to a person. Therefore, it is desired to realize a large-capacity and inexpensive small-sized medium so that data taken with a digital camera can be stored as it is or can be easily given to a person. In addition, in a personal computer, it is desired to realize a large-capacity and inexpensive small medium capable of storing data and passing it to a person. In response to such a demand, a personal computer or a small-sized, low-capacity medium that can store data taken by a digital camera or personal computer data as it is or can easily give it to a person. A medium comprising a card type disk drive that can be loaded into an electronic device such as a digital camera and a magnetic disk cartridge that can be loaded into the disk drive is conceivable. That is, as such a magnetic disk cartridge, a flexible magnetic disk capable of high-density magnetic recording is rotatably accommodated in a housing having an open / close shutter,
For example, a magnetic disk cartridge having a recording capacity of 200 MB or more can be considered. As a high recording density magnetic recording medium, a metal thin film formed by a metal vapor deposition method, a metal thin film formed by a sputtering method, or a barium ferrite powder or a metal powder (for example, a ferromagnetic metal powder) is used. Can be adopted.
As an example of using barium ferrite powder, there is Japanese Patent Application No. 2001-31864 filed by the present applicant. “High recording density magnetic recording medium using barium ferrite powder” is a magnetic disk containing barium ferrite powder in the magnetic layer, and using a material capable of realizing high recording density. For example, Japanese Patent Application No. 20
A nonmagnetic layer containing a nonmagnetic powder and a binder, and a magnetic layer containing a ferromagnetic powder and a binder as hexagonal ferrite powder on at least one surface of a nonmagnetic support disclosed in Japanese Patent Application No. 01-205290 In this order, and the carbon black having an average particle size of 10 to 30 nm is 10 to 10 parts by mass with respect to 100 parts by mass of the nonmagnetic powder.
50 parts by mass, the thickness of the magnetic layer is 0.2 μm or less, and the standard deviation b of the strength relative to the average strength a of the element caused by the ferromagnetic powder by electron microanalysis is 0.00.
03 ≦ b / a ≦ 0.4, and the center plane average roughness Ra of the magnetic layer is 5 nm or less, and the 10-point average roughness Rz is 40 n.
It is a magnetic recording medium that is m or less. For magnetic disks using this material, for example, MR with high recording density is possible.
Information is recorded and reproduced using a magnetic head such as a head. According to the above media, the recording capacity is 200 MB.
As described above, it is possible to realize a medium with a high recording density of preferably 500 MB or more, which makes it possible to record 500 sheets, for example, about 1 MB for a still image and about 30 minutes for a moving image. Video content can be recorded. Accordingly, it is possible to record a moving image shot by a digital camera, a moving image distributed by a mobile phone, and the like, and it is possible to improve user convenience when using content. Of course, it can be conveniently used as an inexpensive large-capacity data storage medium in a personal computer, and its convenience is great. Note that a card-type disk drive that can be loaded into an electronic device is generally shown in FIG.
As shown to (a), it is the disk drive 6 electrically connected and loaded to the socket 4 of the receiving part of the card | curd 2 inserted in the card slot of a PC card, and small electronic devices, such as the digital camera 3. In the case of FIG. 8 (b)
As shown in FIG. 2, the disk drive 6 is electrically connected to the socket of the receiving portion 5 on the electronic device side and loaded.
Accordingly, the disk drive 6 is extremely small, for example, a length of 38 mm to 55 mm and a length of 35 mm to 51 mm.
The magnetic disk cartridge 8 has a length and width of 25 mm to 36 mm and a thickness of 1 mm to 3 mm, for example. It has been proposed that the housing of such an ultra-small magnetic disk cartridge is formed in a disk shape and the magnetic recording medium is handled like a coin. That is, it has been proposed to improve convenience by handling magnetic recording media in a casual manner such as inserting coins into a vending machine. By the way, in the above-mentioned small magnetic disk cartridge, the type of magnetic recording medium accommodated, that is,
For example, there are those with different specifications depending on the type of storage capacity, recording format, read-only / rewritable, etc., but in order to make it easy to perform recycling processing, for example, recycling processing to replace the contained magnetic disk, etc. In addition, there is a demand to use the same housing regardless of the type of the magnetic recording medium. In order to identify the respective small magnetic disk cartridges having the same housing but having different types of magnetic recording media accommodated in accordance with the types, for example, magnetic recording is performed on the surface of the housing. It is conceivable to perform printing that indicates the type of medium by a symbol or a color difference. However, the small magnetic disk cartridge is so small that it can be handled like a coin. When picked with a finger, the entire surface of the front and back touches the finger, and the print applied to the housing surface is worn out over a long period of use. There is a possibility that it is difficult to identify the type of the magnetic disk in this display by printing. That is, there is a possibility that the sharpness of the display on the surface of the housing is lowered and it becomes difficult to identify the type of the magnetic disk. On the other hand, if strong printing that is difficult to wear and hard to peel off, such as baking coating, is applied, there is a problem that much labor is required for removing and repainting the coating when the recycling process is performed. The present invention has been made in view of the above circumstances, and provides a compact magnetic disk cartridge that can reduce the sharpness of the display indicating the type of magnetic disk to a minimum and can be easily recycled. It is intended to provide. The small magnetic disk cartridge of the present invention is a magnetic disk cartridge that can be loaded into a card type disk drive inserted into an electronic device, and the magnetic disk cartridge is a flexible magnetic disk cartridge. A disk and a housing for rotatably accommodating the magnetic disk, the housing including an opening for allowing the magnetic head of the card type disk drive to access the surface of the magnetic disk, and a shutter for opening and closing the opening. In addition, an identification piece for identifying the type of the magnetic disk is embedded in at least one place on the surface of the housing. The kind of the magnetic disk means one classified based on a difference from another magnetic disk, and may be classified based on any difference. For example, storage capacity, recording format,
Types classified based on read-only / rewritable differences are included in the types of magnetic disks. The discriminating piece may be of the type described above by visually recognizing or optically detecting the difference in the reflection and transmission of light for each discrimination piece or the transmission and reflection of light of a specific wavelength. Can be identified. According to the small magnetic disk cartridge of the present invention, the identification piece for identifying the type of the magnetic disk is embedded in at least one place on the surface of the housing. Even if it is deteriorated, it is possible to suppress a decrease in the sharpness of the display indicating the type of the magnetic disk, and it is possible to reliably identify the type of the magnetic disk with this identification piece even during long-term use, and an adhesive. By embedding the identification piece in the housing by press-fitting without using the etc., it is possible to easily remove the identification piece from the housing, thereby further reducing the recycling process of the small magnetic disk cartridge. It can be easily implemented. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a magnetic disk cartridge according to the present invention will be described below with reference to the drawings. FIG. 1 shows a disk drive 6 that is electrically connected to a socket 4 of a receiving portion of a card 2 inserted into a card slot of a PC card similar to that shown in FIG. , Shows a small magnetic disk cartridge according to the present invention inserted into the disk drive 6;
The disk cartridge 10 is a flat housing 1
A flexible disk-shaped magnetic disk 14 is rotatably accommodated in the housing 2, and the housing 12 is a rotary shutter that opens and closes an opening for allowing the magnetic head of the disk drive 6 to access the surface of the magnetic disk 14. 35
And an identification piece for identifying the type of the magnetic disk is embedded in at least one location on the surface of the housing 12. The small magnetic disk cartridge includes a circle along the contour of the magnetic disk 14,
An outer edge having a shape formed by two circumscribed lines of the circle intersecting at right angles to each other is provided. FIG. 2 shows a detailed configuration of the magnetic disk cartridge 10 schematically shown in FIG. 1, FIG. 2 is a perspective view of the magnetic disk cartridge 10 as viewed from above, and FIG. 4 is a perspective view showing a state where the shutter is opened in correspondence with FIG. 2, and FIG. 5 is an exploded perspective view. The magnetic disk cartridge 10 has a housing 12 comprising a metal lower shell 20 and a metal upper shell 30 fitted into the lower shell 20 from above, as shown in FIG. As shown, the metallic shutter 25 on the lower shell 20 side is built in the lower shell 20, the metallic shutter 35 on the upper shell 30 side is disposed outside the upper shell 30, and all the components are inside the lower shell 20. Can be assembled in a stacked manner. As is apparent from FIG. 5, the lower shell 20
Includes a bottom plate 20a that forms the back surface of the housing 12 that defines a planar outline of the housing 12, and an opening 2 that will be described later.
4 and a side wall that rises upward from the periphery of the bottom plate 20a except for the portion 4, and of the side walls, the 2 of the bottom plate 20a
The side wall portions 21 and 22 rising from the outer edge of the linear corner along the outer tangent line of the book are such that the upper edge protrudes in the direction perpendicular to the upper surface of the upper shell 30 and both end portions are adjacent to the circle. An erroneous insertion prevention wall is formed by slightly projecting outward in the surface direction from the circumscribing line of the side wall (peripheral wall) 20b forming the peripheral surface. One side wall 21 is formed so as to be orthogonal to the insertion direction of the disk cartridge 10 into the disk drive 6, and the other side wall 22 is formed parallel to the insertion direction. The end portion of the side wall portion 22 is inserted into the disk drive 6 in the positioning step portion 2.
2a is formed. In addition, a hole 16 is formed in the corner portion of the housing 12 defined by the side walls 21 and 22 so as to penetrate the upper and lower shells 30 and 20 in a direction substantially parallel to the rotation axis of the magnetic disk 14. Hole 1
6 is a positioning reference hole. A center core 15 is fixed at the center of the magnetic disk 14, and a center hole 23 is formed at the center of the bottom plate 20a of the lower shell 20 so that the bottom surface of the center core 15 faces the outside. On the upper surface around the center hole 23, an annular wall 20c that pivotally supports an annular portion 25a of the lower shutter 25 described later is formed coaxially with the center hole 23, and the annular wall 20c is flat. On the upper surface, an annular wall 20d having a smaller diameter is formed on the upper surface so as to be coaxial with the annular wall 20c. These large and small annular walls 2
0c and 20d can be formed by squeezing the bottom plate 20a. Further, the bottom plate 20 of the lower shell 20
An annular wall (not shown) is also formed by squeezing around the positioning reference hole 16 formed at the corner of a. Further, in the lower shell 20, a fan-shaped opening 24 is provided on the opposite side of the center hole 23 from the positioning reference hole 16 side so that a magnetic head described later of the disk drive 6 can access the surface of the magnetic disk 14. Is formed around the center hole 23 over a predetermined angular range, and a rotary lower shutter 25 for opening and closing the opening 24 is disposed inside the lower shell 20. The lower shutter 25 has a central annular portion 25a pivotally supported by the annular wall 20c of the lower shell 20 and a radial direction from the annular portion 25a over a larger angular range than the opening 24. Extending fan-shaped main plate 25
b, and a vertical plate portion 25c bent upward at a substantially right angle along the arc-shaped outer edge of the main plate portion 25b. On the other hand, the upper shell 30 hangs downward from the periphery of the top plate 30a except for the top plate 30a which is substantially similar to the bottom plate 20a of the lower shell 20 and slightly smaller, and the opening 34 which will be described later. And an opening for allowing the magnetic head of the disk drive 6 to access the surface of the magnetic disk 14 at a position coinciding with the opening 24 of the lower shell 20. 34 is formed, and an upper shutter 35 that opens and closes the opening 34 is provided outside the upper shell 30. Furthermore, the upper shells 30 are orthogonal to each other.
In the corner portion where the outer edge is defined by the straight line of the book, a hole 17 in which the identification piece 18 can be embedded later is formed adjacent to the hole 16 that coincides with the positioning reference hole 16 on the lower shell 20 side. ing. In addition, reflection or transmission of light by the identification piece 18 embedded in the hole 17 or reflection or transmission of light of a specific wavelength is visually recognized,
Alternatively, the type of the magnetic disk 14 accommodated in the housing 12 is identified by detection by an optical sensor. The hole 16 is formed by drawing toward the lower surface, and an annular wall (not shown) is formed on the side surface of the hole 16. The upper shutter 35, which is substantially similar to the lower shutter 25, has a central annular portion 35a, a fan-shaped main plate portion 35b extending radially from the annular portion 35a, and an arcuate outer edge of the main plate portion 35b. And a vertical plate portion 35c bent substantially downward at right angles to the main plate portion 35b for opening the shutters 25 and 35.
The operating projection 35d is cut upward from the outer end in the shutter opening direction. It should be noted that the upper edge of the shutter actuating protrusion 35d is defined to be substantially the same height as the upper edges of the corner side wall portions 21 and 22 of the housing 12 after assembly. As will be described later, in order to accommodate the vertical plate portions 25c and 35c which are connected to each other at the time of assembly in a rotatable manner, the rotational ranges of the shutters 25 and 35 are provided on both sides of the opening 24 of the lower shell 20. Peripheral walls 26 and 27 projecting radially outward are formed, and these peripheral walls 26 and 27 are formed.
Recesses 26a and 27a are formed on the inside. In FIG. 2, these recesses 26a and 27a appear as arcuate grooves. Further, on the top surface of the top plate 30a of the upper shell 30, there are an annular portion 35a and a main plate portion 35b of the shutter 35.
A recess 36 (see FIG. 5) for allowing the shutter 35 to rotate is formed, and an annular portion 35a of the shutter 35 is rotatably supported at the center of the recess 36. The circular convex portion 37 is formed. And
When the annular portion 35 a of the shutter 35 is pivotally supported by the circular convex portion 37, the main plate portion 35 b of the shutter 35 is in contact with the bottom surface of the concave portion 36, and the vertical plate portion 35 c is the opening 34 of the upper shell 30.
It covers the outer side of the arc-shaped peripheral wall 30b on both sides. Further, after the upper shell 30 is fitted to the lower shell 20 on the upper edge of the vertical plate portion 25c of the lower shutter 25 and the lower edge of the vertical plate portion 35c of the upper shutter 35, the upper shutter 35 is moved upward. Engaging portions (not shown) are formed which are placed on the shell 30 and engaged with each other by applying force from above, and the upper and lower shutters 3 are formed by this engagement.
5 and 25 are integrated. Next, a method for assembling the magnetic disk cartridge 10 will be described with reference to FIG. The magnetic disk cartridge 10 has a feature that all components can be assembled on the lower shell 20 in a stacked manner. First, the annular wall 2 of the bottom plate 20a of the lower shell 20 is used.
The annular portion 25a of the lower shutter 25 is fitted to 0c. In this case, the shutter 25 is in a closed position in which the main plate portion 35 b closes the opening 24 of the lower shell 20 in such a manner that the vertical plate portion 25 c is accommodated on the inner wall side of the recesses 26 a and 27 a on both sides of the opening 24. Next, the lower sliding sheet 28 is disposed.
The sliding sheet 28 is substantially similar to the bottom plate 20a of the lower shell 20, and has a fan-shaped opening 28a extending outward from the center hole.
And a corner portion defined by two straight lines orthogonal to each other, the central hole serving as the bottom plate 20 of the lower shell 20
It fits in the annular wall 20b of a, and is supported by the flat upper surface of the lower annular wall 20c. The sliding sheet 28 is provided with a hole 28b at the corner portion that coincides with the positioning reference hole 16 in which the bottom plate 20a of the lower shell 20 is formed.
An annular wall formed around the positioning reference hole 16 of the lower shell 20 is fitted to b to support the corner portion. Next, the magnetic disk 14 provided with the center core 15 is disposed on the sliding sheet 28, and the opening 3
After the upper slide sheet 38 having the shape of the lower slide sheet 28 having the holes 8a and the corner holes 38b is disposed on the magnetic disk 14, the peripheral wall 30b of the upper shell 30 is disposed.
Is fitted inside the peripheral wall 20 b of the lower shell 20. Accordingly, the vertical plate portion 25c of the shutter 25 in the recesses 26a and 27a can move along the groove in the groove formed by the recesses 26a and 27a and the peripheral wall 30b of the upper shell 30. In addition, the annular wall of the hole 16 formed in the corner portion of the top plate 30a of the upper shell 30 is fitted into the hole 38b in the corner portion of the upper sliding sheet 38 to support the corner portion of the sliding sheet 38 and The corner portions of the sliding sheets 28 and 38 are also supported by the inner wall surface of the side wall of the corner portion of the upper shell 30. Next, the upper shutter 35 is assembled in such a manner that the annular portion 35a is pivotally supported by the circular convex portion 37 on the upper surface of the upper shell 30, and the vertical plate portion 35c is attached to the vertical plate of the lower shutter 25. Combined with the part 25c, the shutter 2
5, 35 are integrated. Next, a planar spiral spring 40 for urging the shutter is fitted into the circular convex portion 37, and the inner end 40 b of the spiral spring 40 is connected to the slit 37 of the circular convex portion 37.
b, and the outer end 40a is connected to the main plate 3 of the shutter 35.
By engaging with the notch 35e of 5b, the shutters 25 and 35 are urged in the closing direction and held in the closed position. Next, a metal cover plate 41 having an opening 41a following the opening 34 of the upper shell 30 and having a diameter larger than that of the recess 36 of the upper shell 30 is shown in FIG. By adhering the portion on the circular convex portion 37 of the upper shell 30 and adhering the peripheral portion on the top plate 30 a of the upper shell 30, the spiral spring 40 is prevented from being detached and the shutter is placed on the lower surface side of the cover plate 41. 3
Thus, the assembly of the disk cartridge 10 is completed. By making the upper surface of the cover plate 41 an uneven surface, the front and back of the disk cartridge 10 can be identified by touch. For example, the upper surface of the cover plate 41 may be matted to form an uneven surface, and numbers or the like may be written with a pencil. Furthermore, a label 42 made of paper, for example, may be attached to the upper surface of the cover plate 41 so that information can be written thereon. In that case, a perforation 42a along the contour of the opening 41a of the cover plate 41 is provided on the label 42, and a region 42b surrounded by the perforation 42a is cut off during use, so that the virgin of the unused cartridge 10 can be obtained. It can be used for guarantee, and the exposed upper shutter 35 can be protected. The peripheral walls 30 of the upper and lower shells 30 and 20 are also shown.
b, 20b, in order to fit each other elastically, the peripheral wall 30
It is preferable to give elasticity to the peripheral wall 30b by providing a plurality of slits 39 as shown in FIG. Further, on the upper surface of the main plate portion 25b of the lower shutter 25 and the lower surface of the main plate portion 35b of the upper shutter 35, the opening 34 of the upper shell 30 and the openings 28a and 38a of the sliding sheets 28 and 38 are provided.
Cleaning members 44 that come into contact with the surface of the rotating magnetic disk 14 are attached radially. The cleaning member 44 includes shutters 25 and 35.
The main plate portions 25b and 35b are attached radially along the edges in the closing direction.
Has a function of preventing the magnetic disk 14 from coming into contact with the main plate portions 25b and 35b of the shutters 25 and 35 when the magnetic disk 14 is stationary. Further, the cleaning member 4 is opened when the shutters 25 and 35 are opened and the magnetic disk 14 is rotating.
4 is in contact with only one part of the surface of the magnetic disk 14, the balance during rotation of the magnetic disk 14 is poor.
A protrusion 45 having the same height as the cleaning member 44 is formed on the surfaces of the sliding sheets 28 and 38 provided for protecting the magnetic disk 14 facing the magnetic disk 14 with respect to the cleaning member 44 when the shutter is opened. It is preferable to provide radial positions at positions displaced by 180 degrees. 2 each
The protrusion 45 of the book is attached to the cleaning member 4 when the shutter is opened.
4 may be provided radially at positions displaced by 120 degrees with respect to 4. FIG. 6 is a schematic plan view showing a state in the middle of inserting the magnetic disk cartridge 10 into the disk drive 6, and FIG. 7 is a schematic plan view showing a state in which the magnetic disk cartridge 10 is mounted in the disk drive 6. FIG. 6 and 7 are used for explaining the relative positional relationship between the magnetic disk cartridge 10 and the disk drive 6, and details are omitted. The disk drive 6 is provided with a cartridge insertion slot 6a and an internal cartridge storage space 7, and is normally retracted outside the insertion path of the cartridge 10 (the edge of the path is indicated by a broken line L). When the cartridge 10 is inserted into the disk drive 6 with the head assembly 50 having a pair of upper and lower rotary arms 51, the shutters 25 and 35 are engaged with the operating protrusions 35d of the shutter 35. And a shutter operating member 52 that is opened. Magnetic heads 53 are fixed to the tips of the arms 51 so as to face each other, and are configured to access both surfaces of the magnetic disk 14. The cartridge insertion slot 6a
Is formed in contact with the side wall surface 6b opposite to the head assembly 50 side of the disk drive 6, and this side wall surface 6b.
In addition, a positioning projection 6 c that engages with the insertion positioning step 22 a of the side wall 22 of the magnetic disk cartridge 10 is formed. Although not shown, at the upper edge of the cartridge insertion slot 6a, a position corresponding to the upper edge of the side wall portion 22 of the magnetic disk cartridge 10 and the operating protrusion 35d of the shutter 35 in the closed position. In addition, notches that allow these passages are formed to prevent erroneous insertion of the magnetic disk cartridge 10. The magnetic disk cartridge 10 is inserted into the disk drive 6 from the direction indicated by the arrow in FIG. 6, and at this time, the operating protrusion 35d provided in the shutter 35 is provided.
Further, the shutter operating member 52 of the disk drive 6 is engaged, and the shutters 25 and 35 are opened as the magnetic disk cartridge 10 is inserted. In this case, since the operating protrusion 35d of the upper shutter 35 is provided on the right side with respect to the insertion direction of the magnetic disk cartridge 10, the magnetic disk cartridge is moved from the shutter operating member 52 as the magnetic disk cartridge 10 is inserted. A force F is applied to 10 in order to rotate it clockwise in the figure, but the side wall 22 extending linearly at the corner of the housing 12 abuts against the inner wall 6b of the disk drive 6 and rotates. Is to be blocked.
Then, as shown in FIG. 7, when the magnetic disk cartridge 10 is completely inserted into the disk drive 6, the arm 51 of the head assembly 50 rotates counterclockwise in the figure, and the magnetic head 53 is moved to the magnetic disk. 14 on both sides. Incidentally, the magnetic disk cartridge 10 described above.
Is completely inserted into the disk drive 6, the identification piece 18 is disposed so as to be positioned at the detection position of the spectral reflectance sensor 54 disposed on the side surface of the disk drive 6. The type of the magnetic disk 14 is identified on the disk drive 6 side by measuring the reflectance of light of a specific wavelength by the identification piece 18 by the rate sensor 54. As is apparent from the above description, the small magnetic disk cartridge has the identification piece deteriorated because the type of the magnetic disk accommodated is identified by the indication by the identification piece embedded in the housing. However, the sharpness of the display can be suppressed to a low level, and the identification piece 18 is embedded in the hole 17 of the housing 12 without using an adhesive or the like. This small magnetic disk cartridge can be recycled more easily regardless of the type of disk. Furthermore, in the present embodiment, since the lower shell 20, the upper shell 30, the cover plate 41, and the shutters 25 and 35 are all made of metal, the recycling process can be carried out more easily. In the small magnetic disk cartridge, the housing 12 is composed of a lower shell 20 and an upper shell 30 that is fitted inside the lower shell 20 from above, and constitutes the magnetic disk cartridge 10. All the components to be assembled are assembled in the lower shell by fitting in a stacked manner except for the cover plate 41 which is bonded onto the circular recess 37 of the upper shell 30. Nevertheless, it has the advantage that it has excellent decomposability and can be easily recycled.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic illustration showing a small magnetic disk cartridge according to the present invention together with a disk drive into which the disk cartridge is inserted and an electronic device having a card slot into which the disk drive is loaded. 2 is a perspective view of a small magnetic disk cartridge according to the present invention as viewed from above. FIG. 3 is a perspective view of the small magnetic disk cartridge of FIG. 2 as viewed from below. FIG. 4 is a shutter of the small magnetic disk cartridge of FIG. FIG. 5 is an exploded perspective view of the small magnetic disk cartridge of FIG. 2 showing a state in which the small magnetic disk cartridge is opened. FIG. 6 is a schematic plan view showing how the small magnetic disk cartridge is inserted into the disk drive. FIG. 7 is a schematic plan view showing a state in which a small magnetic disk cartridge is mounted on a disk drive. FIG. 8 is a schematic explanatory view showing a disk drive as a premise of the present invention together with an electronic device having a card slot into which the disk drive is loaded. DESCRIPTION OF SYMBOLS 10 Magnetic disk cartridge 12 Housing 14 Magnetic disk 18 Identification piece 20 Lower shell 30 Upper shell

Claims (1)

What is claimed is: 1. A magnetic disk cartridge that can be loaded into a card-type disk drive that is inserted into an electronic device, wherein the magnetic disk cartridge is a flexible magnetic disk, and the magnetic disk is rotatable. A housing for receiving the magnetic head of the card type disk drive, and a shutter for opening and closing the opening. A small magnetic disk cartridge characterized in that an identification piece for identifying the type of the magnetic disk is embedded in at least one place.