JP2667657B2 - Mounting device for disk-shaped recording media - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc-shaped recording medium, for example, an optical disc, a magneto-optical disc, or other such disc-shaped recording medium. And the like to improve a device to be coupled to a rotary drive device. 2. Description of the Related Art A technique for moving a cartridge and coupling a disk-shaped recording medium in the cartridge to a rotary drive is disclosed in, for example, JP-A-59-154669. This publication describes a device for attaching and detaching a cartridge containing a disk-shaped magnetic recording medium which is a disk-shaped recording medium. According to this technique, after a cartridge (reference numeral 56 in the above publication) is set at a predetermined position of a holder (reference numeral 47 in the above publication) as a cartridge holding body,
The motor is coupled to the magnetic recording medium by moving the holder in a direction perpendicular to the medium surface of the magnetic recording medium. Here, in a state where the motor (reference numeral 30) and the magnetic recording medium are connected to each other, a direction substantially perpendicular to the surface of the medium is determined based on the force generated from the elastic members (reference numerals 39a and 39b). The supporting substrate (reference numeral 26), which is a member to which the motor is fixed, and the holder are pressed against each other (see FIG. 8B in the above publication). However, in the structure disclosed in the above publication, the cartridge inside the holder is in a free state, and in such a state, only the magnetic recording medium which is the disk-shaped recording medium in the cartridge. When the cartridge is connected to the motor, the cartridge may be displaced by the vibration of the motor or the like at the time of reproducing the information, and there is a drawback that accurate information cannot be reproduced if the state is left as it is. As a solution to this drawback, Japanese Utility Model Application
There is a technique disclosed in JP-A-42568 (full text and drawings). In this publication, when a motor (reference numeral 7) and a disk-shaped recording medium are combined, a disk case (reference numeral 2) as a cartridge and positioning pins (reference numeral 8) are provided.
The base (reference numeral 9) on which the motor and the motor are arranged is in a pressed state with respect to a direction perpendicular to the medium surface (vertical direction in FIG. 6). However, in the configuration of this publication, the engagement holes 2 which are positioning holes formed in the disk case are provided.
Each of a and 2b has a circular shape when viewed in a direction perpendicular to the medium surface. In this case, when the distance between the engagement hole 2a and the engagement hole 2b varies depending on the disc case,
The pin may not be inserted smoothly into the engagement hole.
If such a state is left as it is, there is a drawback that a highly reliable disk mounting device cannot be provided. On the other hand, JP-A-59-2
No. 18681 discloses a cartridge containing a magnetic sheet (reference numeral 6) which is a disk-shaped recording medium and having two first positioning holes (reference numeral 4a) and second positioning holes (reference numeral 4a). A cassette housing (reference numeral 4) is disclosed. The first positioning hole has a circular shape when viewed in a direction perpendicular to the medium surface of the magnetic sheet (reference numeral 6). On the other hand, the second positioning hole (reference numeral 4b) has a long hole shape along a direction parallel to the arrow A direction in FIG. 2 of JP-A-59-218681 (“a long hole along the direction parallel to the arrow A direction”). As shown in FIG. 2, the "shape"
Hole size in the direction perpendicular to the direction of arrow A). Here, JP-A-5
FIG. 4 of Japanese Patent Application Publication No. 9-218681 describes a configuration in which a positioning pin (reference numeral 14) is inserted into a positioning hole (reference numeral 4a) and a positioning pin (reference numeral 15) is inserted into a positioning hole (reference numeral 4b). . Here, both positioning holes (reference numerals) pass through the center axes of the positioning pins (reference numeral 14) and positioning pins (reference numeral 15) and are parallel to the medium surface of the magnetic sheet (reference numeral 6) which is a disk-shaped recording medium. Consider a virtual straight line intersecting with 4a, 4b) and assume that the positioning hole (reference numeral 4b) is viewed from the bottom to the top in the direction perpendicular to the medium surface. At this time,
A first line segment (parallel to the leading end of the lead wire 4b in FIG. 2) which is substantially parallel to the direction of arrow A in FIG. 2 and forms a second hole forming a long hole of the positioning hole (4b).
(The straight line portion of the positioning hole 4b substantially opposed to the straight line portion intersecting the leading end of the lead line 4b in FIG. 2), the first line segment and the second line segment The relationship is non-parallel to the virtual straight line. In the configuration of the positioning hole (reference numeral 4b), when the distance between the positioning hole (reference numeral 4a) and the positioning hole (reference numeral 4b) of the cassette housing (reference numeral 4) is deviated from a predetermined size, the positioning pin (reference numeral) is used. 15) is a positioning hole (reference numeral 4)
It may not be inserted smoothly into b). If such a state is left as it is, there is a disadvantage that a highly reliable mounting device for a disk-shaped recording medium cannot be provided. An object of the present invention is to provide a mounting device for a disk-shaped recording medium which solves the above-mentioned disadvantages. It is an object of the present invention to provide a disk-shaped recording medium mounting device that solves the above drawbacks. A disk-shaped recording medium mounting apparatus of the present invention accommodates a disk-shaped recording medium and has at least two first positioning holes and second positioning holes. Cartridge, a cartridge holder for holding the cartridge, a motor for rotating the disk-shaped recording medium, and a motor extending in a first direction substantially perpendicular to the medium surface of the disk-shaped recording medium. And a positioning hole of each of the first positioning hole and the second positioning hole (a “hole” refers to a recessed portion and is at least parallel to the medium surface in relation to a positioning pin. If it has a function to determine the position of the cartridge in the direction, the "hole" is included in the "positioning hole". Has a configuration in which the end portion of the positioning pin is narrower than the original portion as it goes ahead) from the member where the first positioning pin and the second positioning pin are arranged. And mounting the disk-shaped recording medium in such a manner that the disk-shaped recording medium is connected to the motor ("coupled" means a form in which the disk-shaped recording medium also rotates when the motor is driven to rotate). In the apparatus, each positioning hole of the first positioning hole and the second positioning hole is viewed in the first direction ("viewed in the first direction" refers to a direction perpendicular to a medium surface). It is composed of only a single hole shape ("
"Consisting of only a single hole shape when viewed in the direction of". "Means that when the first positioning hole is cut in a virtual plane parallel to the disk-shaped recording medium, The shape of the hole structure in which the hole shape contour is generated. or,
When the second positioning hole is cut in a plane parallel to the disc-shaped recording medium, the hole structure has the same kind of hole-shaped contour at any hole position. For example, when the insertion hole 45 is cut along an imaginary plane parallel to the medium surface of the magnetic disk 10 as in an insertion hole 45 on the left side of FIG. The outline of the hole 45 is oval, and the outline of the hole 45 of the insertion hole 45 obtained by cutting the upper case 2 is intended to exclude a hole structure that is circular) and is isolated from the space in the cartridge in which the disk-shaped recording medium is stored. ("Separated from the space in the cartridge in which the disc-shaped recording medium is stored" means a configuration in which "the positioning holes" are not connected to the "space." Sho 59
As shown in FIG. 4 of JP-A-42568, the purpose is to exclude a configuration in which an engaging hole 2a as a positioning hole is connected to a space portion of a disk case 2 in which a disk 1 is stored. In a state where the cartridge is coupled to the motor (“coupled” refers to a form in which the disc-shaped recording medium also rotates when the motor is rotationally driven), the cartridge and the cartridge holder with respect to the first direction. And the cartridge is in contact with the cartridge holder in the first direction, and the cartridge and the member are in a pressed state with respect to each other in the first direction. If a force is applied between the cartridge and the member toward each other, it is included in the “relationship between the pressed states”. And the hole shape is circular (“the hole shape is circular” means the shape of the first positioning hole when the cartridge is viewed in the first direction). In the positioning hole of the first
And the second positioning pin is inserted into the second positioning hole, the axis of the first positioning pin (parallel to the first direction and centered on the positioning pin). A straight line passing through the first positioning hole, passing through the axis of the second positioning pin (referring to a straight line parallel to the first direction and passing through the center of the positioning pin) and parallel to the medium surface. Considering a virtual straight line that intersects both positioning holes of the second positioning hole, assuming that the second positioning hole is viewed in the first direction, the hole shape of the second positioning hole is Forming a long hole shape along a virtual straight line (“forming a long hole shape along the virtual straight line” means that the width dimension of a hole intersecting the virtual straight line is a width dimension of a hole in a direction perpendicular to the virtual straight line. Meaning that it has a shape that makes it more relevant A first line segment (referred to as a straight line having a limited length or a portion of a substantially straight line) and a second line segment (referred to as a straight line having a limited length or a portion of a substantially straight line) are substantially parallel to the virtual straight line. ), And the dimension of the positioning holes in the first direction is the length dimension of the positioning pins inserted into the positioning holes in the first direction (of the positioning pins). (Refer to the dimension in the first direction of only the portion inserted into the positioning hole). An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 are partial cross-sectional front views showing the construction of the main part for explaining the operation of the transport mechanism of the cartridge accommodating the disk of the present invention, and FIG. 3 is a side view thereof. Reference numeral 1 denotes a cartridge containing a disk, and its bottom view is shown in FIG. In FIG. 4, reference numeral 301 denotes an insertion slot for a recording / reproducing head; 302, a disc drive turntable insertion slot in the apparatus; 303 to 306, positioning holes provided at four corners on the bottom surface of the cartridge 1; Notches formed on both sides of the cartridge are used for positioning with respect to the cartridge carrier when the cartridge is carried as described later. In addition,
Although not shown in this figure, a concave portion for positioning and fixing with respect to the transport body at the time of transport is also provided on the upper surface of the cartridge 1. In FIGS. 1 to 3, 2 is a cartridge carrier provided inside the cartridge insertion port of the recording / reproducing apparatus, 3 is a clamp guide plate fixed to the machine frame of the apparatus, and 4 is a cartridge carrier. A drive mechanism comprising a link lever for the cartridge, 5 is a conveyance guide groove of a cartridge formed on a side plate of the apparatus, 6 is a side plate of the apparatus, 7 is a base of the apparatus, and 8 is a disk clamp apparatus. Hereinafter, the configuration of each section will be described in more detail. The cartridge carrier 2 is a frame provided inside the cartridge insertion slot (not shown) of the recording / reproducing apparatus as described above, and inserts the cartridge 1 through the cartridge insertion opening 201, holds the cartridge 1, and holds the cartridge 1 in a predetermined position. It is transported to a position (the position shown in FIG. 2). A disc clamp device 8 is provided on the upper plate 202 of the cartridge carrier 2, and a roller frame 204 having a plurality of cartridge insertion guide rollers 203...
Is provided. As shown in FIG. 3, this carrier support frame 205
The angled leg portion 206 formed by bending 02 is screwed to one, and the roller 203 of the roller frame 204 supports the cartridge. In addition, the transport support 20
5 is provided with a conveyance guide roller 207,
Of the transport guide roller 2
A long groove 209 formed in the link lever of the drive mechanism 4 is engaged with the interlocking shaft 208 supporting the drive shaft 07. Reference numeral 210 denotes the upper plate 20 of the cartridge carrier 2.
With the cartridge holder attached to No. 2, the roller 212 provided at the tip of the elastic arm 211 presses the concave portion for positioning and fixing provided on the upper surface of the cartridge 1. The disk clamp 8 is pivotally attached to a pivot 803 of a clamp support plate 802 of a clamp table 801 provided on the upper plate 202 of the cartridge carrier 2. A clamp head 805 is attached to the tip of the clamp support arm 804 and a clamp holder 806.
It is supported by loose fit. Also, the clamp support arm 80
At the other end of 4, a cylindrical clamp operating end 807 is provided. The clamp operating end is in sliding contact with the lower surface of the clamp guide plate 3 described above. The clamp guide plate 3 holds the clamp operating end 8 of the disc clamp 8 while the cartridge carrier 2 is in the horizontal carrier part of the guide groove 5 described later from the position before the cartridge is inserted in FIG.
07 is held, the clamp support arm 804 is held in a left-handed state, and the clamp head 805 is held in a non-operation position. Reference numeral 5 denotes the above-described guide groove, which is formed on the side plate 6 of the apparatus, and forms a horizontal transport portion 501 and a vertical descending transport portion 502 in which a transport guide roller 207 interlocked with the cartridge transport body 2 by an interlocking shaft 208 is engaged. doing. 40
Reference numeral 1 denotes a link lever that constitutes a part of the drive mechanism of the cartridge transporting body, and is a linking shaft of the cartridge transporting roller 207 that fits in the guide groove, and a long groove 209 at the tip thereof.
Are adapted to engage. Reference numeral 402 denotes a drive shaft connected to a power source (not shown). This link lever 4
The drive mechanism by 01 may be one set of link levers in principle, but two sets are provided in this embodiment from the viewpoint of the stability of the cartridge carrier 2 and the distribution of the driving force. Reference numeral 701 denotes a cartridge positioning pin implanted on the base 7 of the apparatus.
Are provided at positions corresponding to the positioning holes 303 to 306, respectively, and a vertical positioning member 702 of the cartridge 1 is provided at a part thereof. The vertical positioning member 702 may be a step formed integrally with the positioning pin 701 itself. Here, among the positioning holes 303 to 306 of the cartridge 1 shown in FIG.
As shown in FIG. 4, reference numerals 5, 304 and 306 each have a circular hole shape when viewed in a direction perpendicular to the medium surface (direction perpendicular to the paper surface). As is apparent from FIG. 4, the positioning holes 304 and 306 have a slightly larger shape than the circular hole shape of the positioning hole 305. Here, in the configuration of the apparatus shown in FIG. 2, the disk-shaped recording medium 9 and a motor (not shown) for rotating the turntable 703 are connected. The positioning pins 701, 701, 701, 701 each having a tapered end are inserted into the respective pins. In the configuration of FIG. 2, the axes of the positioning pins 701 inserted into the positioning holes 303 and the positioning pins 701 inserted into the positioning holes 305 (in the example of FIG. 2, the truncated cone portion of the positioning pins 701). , Or the central axis of the cylindrical portion. A straight line of infinite length that coincides with the central axis may be considered as the axial center) and is parallel to the medium surface of the disc-shaped recording medium 9 and the positioning hole 305 and the positioning hole. Virtual straight line L intersecting with 303
(See FIG. 4). Then, the positioning hole 303 is elongated along the virtual straight line L (the “long hole shape” means that the width dimension of the positioning hole 303 intersecting the virtual straight line L is the width of the positioning hole 303 in a direction perpendicular to the virtual straight line L). The hole shape has a relationship that is larger than the width dimension). The elongated hole in the case of the positioning hole 303 has a substantially oval shape (a shape in which the outline of the hole is formed by a semicircle and a straight line). Further, the line segment 303a and the line segment 303b shown in FIG. 4 in the hole-shaped contour portion of the positioning hole 303 are substantially parallel to the virtual straight line L. When the cartridge 1 of FIG. 4 is viewed in a direction perpendicular to the paper surface (when viewed in a direction substantially perpendicular to the medium surface of the disk-shaped recording medium 9), the positioning hole 305 has a single shape (a single circular shape). It can be confirmed that it is composed only of the types (shapes). On the other hand, it can be confirmed that the positioning hole 303 is also constituted only by a single shape (a single type of shape, which is substantially an oval shape). The operation of the cartridge transport positioning mechanism of the present invention will be described below with reference to the drawings. First, the cartridge 1 containing the disk-shaped recording medium 9 shown in FIG.
Is inserted in the direction of the arrow from the cartridge insertion opening 201 of FIG. 1 with the surface shown in FIG. 4 facing down, the cartridge 1 slides on the cartridge insertion guide roller 203 provided on the roller frame 204. Carrier 2
Is inserted into. At this time, on the upper surface of the cartridge 1, the roller 212 of the cartridge holder 210 is attached to the elastic arm 2 thereof.
It can be pushed up against the elasticity of 11 and can be inserted without play. Eventually, when the cartridge 1 is completely pushed into the cartridge carrier 2, the cartridge holding roller 212 on the upper surface of the cartridge falls into a positioning recess provided on the upper surface of the cartridge, and locks the cartridge 1. At the same time, although not shown, the elastic locking member provided on the side of the cartridge carrier 2 engages with the notch 307 on the side of the cartridge, so that the position fixing of the cartridge in the carrier is completed. When the insertion and fixing of the cartridge is completed, a sensing switch of a well-known means (not shown) is operated and after a predetermined time (time for confirming insertion), a power source (not shown) is turned on, and the link lever 401 is formed. The drive mechanism starts to operate. When the drive mechanism starts operating, the two sets of link levers 401 swing leftward about the shaft 402. Accordingly, the cartridge carrier 2 is interposed between the guide roller 207 and the interlocking shaft 208 of the cartridge carrier support frame 205 fitted in the long groove 209 of the end of the link lever 401.
Moves to the left in FIG. 1 along the horizontal transport portion of the transport guide groove 5. When the conveyance guide roller 207 reaches the left end of the guide groove 5, that is, the position of the vertically descending conveyance section 502, the cartridge conveyance body 2 moves the vertically descending conveyance section 5 of the guide groove 5.
Start descending along 02. Then, first, the cartridge 1 descends together with the cartridge carrier 2 while the positioning holes 303 to 306 of the cartridge are fitted to the positioning pins 701 to perform horizontal positioning. At the same time, the clamp support arm 804 of the clamp 8 starts to turn clockwise as the cartridge carrier 2 descends. Since a groove for guiding the conveying guide roller 207 in a direction perpendicular to the medium surface is formed, the side plate 6 has a vertical guide portion 601 formed by the side surface of the side plate 6.
(Consisting of a linear elongated surface). When the transport guide roller 207 is guided by the groove formed by the vertical guide portion 601 and descends to near the lower end of the vertically descending transport portion 502, the cartridge 1 guided by the positioning pins 701 by the lowering of the cartridge transport body 2
Is regulated in the descending position by the step portion of the vertical positioning member 702 of the pin 701, and the drive mechanism stops its operation in response to a signal from a transport body movement end detection circuit (not shown). At this time, the transport guide roller 207 is not in contact with the side plate 6 that is a member that forms a groove in the direction perpendicular to the medium surface in the direction perpendicular to the medium surface. That is, in FIG. 2, the surface perpendicular to the paper surface of the conveyance guide roller 207 and the curved portion 602 which is the lower end of the groove are in a non-contact state in the direction perpendicular to the medium surface. Therefore, the conveyance guide roller 207 integrated with the interlocking shaft 208 is not pressed against the side plate 6 (more specifically, the curved portion 602) corresponding to the base in a direction perpendicular to the medium surface. At this time, the relationship between the height of the disk mounting surface of the turntable 703 and the vertical positioning member 702 of the positioning pin 701 is determined for the disk-shaped recording medium 9 in the cartridge 1 as described above. As shown in FIG. 2, the cartridge 1 is supported by a turntable with a gap substantially in the center thereof. At the same time, the clamp head 805 supported by the clamp holder 806 at the tip of the clamp support arm of the disk clamp 8 that has turned clockwise with the lowering of the cartridge carrier 2 is moved to the turntable 70.
3. The disk 9 fitted to the central spindle guide 704 is pressed from above and clamped. Reference numerals 808 and 809 denote disk holders and magnets provided on the clamp head, respectively. In this way, the transporting and positioning operations of the cartridge 1 are completed, and after performing the necessary recording and reproducing operations on the recording medium, the drive mechanism 4 including the link lever 401 starts operating again by operating an eject button (not shown). This time, by swinging (clockwise) the link lever 401 in the opposite direction, the cartridge transport body 2 reversibly moves and returns to the state of FIG. According to the present invention, the disc-shaped recording medium mounting apparatus accommodates the disc-shaped recording medium and has at least two first positioning holes (for example, the positioning holes 305) and second positioning holes. A cartridge having (for example, the positioning hole 303), a cartridge holder (for example, the cartridge carrier 2) for holding the cartridge, and a motor for rotating the disc-shaped recording medium (for example, the turntable). A motor for rotating and driving 703. The turntable 703 is a part of the motor) and extends in a first direction (for example, the vertical direction of FIG. 2) substantially perpendicular to the medium surface of the disc-shaped recording medium, and A first having a tapered end for insertion into each of the first and second positioning holes.
Positioning pin (for example, the positioning pin 701, or a combination of the positioning pin 701 and the positioning member 702,
Alternatively, a combination of the positioning pin 701, the positioning member 702, and the base 7 of the apparatus and a second positioning pin (for example, a combination of the positioning pin 701 or the positioning pin 701 and the positioning member 702, or the positioning pin 701) A positioning member 702 and a member (a combination of the base 7 of the apparatus) and a member (for example, the base 7) in which the positioning member 702 and the device are arranged, and the disk-shaped recording medium is configured to be coupled to the motor. In the mounting device, each positioning hole of the first positioning hole and the second positioning hole is the first positioning hole.
In a state in which the disc-shaped recording medium is coupled to the motor, the disc-shaped recording medium is configured to have only a single hole shape when viewed in the direction, and is isolated from the space in the cartridge in which the disc-shaped recording medium is stored. (For example, in the configuration of FIG. 2), the cartridge is disposed between the cartridge holder and the member in the first direction (for example, in the configuration of FIG. The cartridge 1 is disposed between the upper plate 202 of the carrier 2 and the base 7), and the cartridge is in contact with the cartridge holder in the first direction. The first positioning pin is inserted into the first positioning hole having a circular shape with respect to the first direction. And the second positioning pin is inserted into the second positioning hole, passes through the axis of the first positioning pin and the axis of the second positioning pin, and Considering an imaginary straight line that is parallel and intersects both the first positioning hole and the second positioning hole, the second positioning hole is assumed to be viewed in the first direction. The positioning hole has a long hole shape along the virtual straight line and has a first line segment and a second line segment substantially parallel to the virtual straight line. The present invention is characterized in that the hole dimension in the first direction is larger than the length dimension in the first direction of each positioning pin inserted in the positioning hole. Has the following effects. Even if the distance between the first positioning hole and the second positioning hole provided in the cartridge is slightly different from the predetermined distance, the cartridge and the motor can be positioned with at least two positioning elements with a very simple structure. It can be expected that the member on which the pin and the pin are arranged can be smoothly and firmly held, and as a result, the disc-shaped recording medium can be mounted with high reliability. or,
Since each positioning hole is isolated from the space inside the cartridge in which the cartridge is housed, there is an advantage that dust or the like is less likely to enter the cartridge through the positioning hole.
Further, since the dimension of the positioning hole in the first direction is larger than the length of the positioning pin inserted into the positioning hole in the first direction, the cartridge can be reliably held in the first direction. Become.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of a main part for explaining an operation of a carrying mechanism of the present invention. FIG. 2 is a partial sectional view of a main part for explaining the operation of the transport mechanism of the present invention. FIG. 3 is a side view of each of FIGS. 1 and 2; FIG. 4 is a schematic plan view of a cartridge used in a recording / reproducing apparatus using the transport mechanism of the present invention. [Description of Signs] 1 Cartridge 2 Cartridge transporter 3 Clamp guide plate 4 Drive mechanism 5 Guide groove 6 Side plate 7 Device base 8 Disk clamp 9 Disk-shaped recording medium 401 Link lever 501 Horizontal transport unit 502 Vertical descending transport unit 701 Positioning Pin 702 Vertical positioning member 703 Turntable 805 Clamp head 807 Clamp operating end 808 Disc holder

Claims (1)

(57) [Claims] A cartridge accommodating a disk-shaped recording medium and having at least two first positioning holes and a second positioning hole, a cartridge holder for holding the cartridge, and rotating the disk-shaped recording medium And a taper extending in a first direction substantially perpendicular to the medium surface of the disk-shaped recording medium and inserted into each of the first positioning hole and the second positioning hole. A disc-shaped recording medium mounting device configured to couple the disc-shaped recording medium to the motor, the first positioning pin having a first end and a second positioning pin disposed on the first positioning pin; The positioning hole of the second positioning hole and the positioning hole of the second positioning hole have only a single hole shape when viewed in the first direction, and the disk-shaped recording medium When the disc-shaped recording medium is coupled to the motor, the cartridge is positioned between the cartridge holder and the member in the first direction when the disc-shaped recording medium is coupled to the motor. And the cartridge is in contact with the cartridge holder in the first direction, the cartridge and the member are in a pressed relationship with each other in the first direction, and the The first positioning pin is inserted into the first positioning hole having a circular shape, and the second positioning pin is inserted into the second positioning hole. Both the first positioning hole and the second positioning hole pass through an axis and the axis of the second positioning pin and are parallel to the medium surface. Considering a virtual straight line intersecting with the positioning hole, assuming that the second positioning hole is viewed in the first direction, the hole shape of the second positioning hole is elongated along the virtual straight line. It has a first line segment and a second line segment that are shaped and are substantially parallel to the virtual straight line, and the hole dimensions of the respective positioning holes in the first direction are inserted into the positioning holes. The mounting device for a disk-shaped recording medium, wherein the positioning pins have a relationship that is larger than a length dimension of the positioning pins in the first direction.