JPH01279455A - Disk player - Google Patents

Abstract

PURPOSE:To enable the secure clamp even when a different diameter disk is inserted by positioning a small diameter disk in a specific position of a stopper member when it is inserted and moving the stopper member when a large diameter disk is inserted. CONSTITUTION:In case of using the small diameter disk S, arms 31 and 32 are drawn toward each other by a spring 37, whereas a supporting lever 41 and an engaging lever 4 are not moved from their initial setting positions. At this time, when the disk S is inserted and drawn inside, the outer periphery of this disk S is brought into contact with abutting pins 35 and 36. Since the disk S is weak in its feed force, the disk S is positioned by the pins 35 and 36. Then, when the large diameter disk L is used, since the driving force for driving this disk is stronger than the drawing force of the spring 37 upon the arms 31 and 32 to each other, the pins 35 and 36 are pushed into the interior. Subsequently, the arms 31 and 32 are turned around a rotation axis 29 to be locked in their prescribed positions. Consequently, the disk L is supported in this position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc player such as a compact disc player or a video disc player, and particularly relates to a disc player that allows the same disc player to play discs of different diameters. .

(Prior Art) Conventionally, compact discs have generally had a relatively large diameter (usually 12c+n) on which multiple songs have been recorded.
With the spread of CD players in recent years, so-called CD single discs, which are smaller diameter discs (usually 8 cm) and have two or three songs recorded on them, have become popular, and both the large-diameter disc and the small-diameter disc have become popular. CDs that can be played
Player development is required.

Conventionally, when disks of different shapes are inserted into the same insertion slot, an adapter 1 as shown in FIG. 10 has been used. This adapter 1 is formed to have the same diameter as the large-diameter disk, and has support arms 3 at several locations that are elastic and can be expanded. Small diameter disc (S)
is clamped by a clamp protrusion 4 provided on the support arm 3. This adapter 1 is inserted through the insertion opening of a CD player so that a small diameter disc (S) can be reliably clamped to the turntable.

(Problem to be Solved by the Invention) However, when a small-diameter disk is attached to the adapter 1 and inserted from the insertion slot of the CD player as in the conventional case, there is a disc between the support arm 3 of the adapter and the base disk 2. The kerf portion 3a (groove for allowing the support arm 3 to expand elastically) may pass over optical detection means for detecting disk insertion during disk loading. In this case, the detection means will make a false detection, and the disk loading operation will stop midway, causing problems such as the disk not being able to be loaded in a predetermined position or being unable to be ejected.

In addition, general users think that they can use small-diameter discs as they are, but when a small-diameter disc is inserted into the insertion slot, the disc cannot be ejected and the CD player itself becomes unusable.

The present invention solves the above problems, and even when discs with different diameters are inserted from the same insertion port,
The object of the present invention is to provide a disk player that can reliably clamp disks of various diameters to the turntable of a disk drive mechanism and eject them reliably.

[Means to solve the problem]

A disc player according to the present invention is a disc player that is provided with an insertion opening into which discs of different diameters are inserted and a disc drive mechanism located at the back of the insertion opening, and in which a small-diameter disc is inserted into the disc insertion passage. A stopper member is provided at a position to prevent the disk from coming off the disk drive mechanism and entering the back of the path, and which can move to the back of the disk insertion path when a large-diameter disk is inserted.

The present invention also provides a disc player that is provided with an insertion slot into which discs of different diameters are inserted, and a disc drive mechanism located at the back of the slot, and in front of the disc drive mechanism, there is a disc drive mechanism located at both ends. A disk feeding mechanism is provided that has a drive roller formed so that the diameter is not large and pinches and draws the disk in. Also, in the disk insertion passage, there is a drive roller that is formed so that the diameter is not large. A stopper member is provided, which is located at a position to prevent the disc from entering the inner part of the passage, and which can move eight times towards the inner part of the disc insertion passage when a large-diameter disc is inserted. The resistance force that is sometimes exerted is set to be stronger than the feeding force when a small-diameter disk is drawn in by the disk feeding mechanism, and weaker than the feeding force when a large-diameter disk is drawn in.

Furthermore, in the above means, the stopper member moves as the large-diameter disk is inserted, and the stopper member is located at a position that prevents the large-diameter disk from coming off the disk drive mechanism and moving toward the back of the passage. The lockable member or stopper member is arranged at two points facing the outer periphery of the disc across the center of the disc insertion passage.

Furthermore, the stopper member is arranged at two points facing the outer periphery of the disc at two points sandwiching the center of the disc insertion passage, so that when a small diameter disc is inserted from a position away from the center of the insertion slot. In this case, the resistance force when the stopper member moves toward the back is set to be stronger than the pulling force of the disk feeding mechanism, so that the outer periphery of the small-diameter disk hits the stopper member at two points, and the small-diameter disk is pushed into the disk insertion path. It is designed so that it is fed to the center position.

(for production) The above technical means works as follows.

When a small-diameter disk is inserted into the insertion slot, the small-diameter disk enters the deep part of the insertion slot due to the driving force of the drive roller. On the way, the disc comes into contact with the stopper member, so the disc is oriented at that position, and the disc drive mechanism clamped in position where it can be driven by.

In addition, when a large diameter disk is inserted, the driving force of the drive roller causes it to enter the deep part of the insertion slot. On the way, the disk contacts the stopper member and presses the stopper member with a large driving force. The large-diameter disk moves out of the passage and is oriented at a predetermined position without being affected by the stopper member, and is clamped at a position where it can be driven by the disk drive mechanism.

Furthermore, even if a small-diameter disk is inserted from a position away from the center of the insertion slot, the disk will move inward due to the driving force of the drive roller, and the outer periphery of the disk will come into contact with the stopper protrusion. When the drive roller continues to rotate further, the disk moves to a position where two points on its outer periphery contact the stopper protrusions, that is, toward the center of the passage, and moves to a predetermined clamping position.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail using FIGS. 1 to 9.

FIG. 1 is a front view showing the operation section of the disc player. In this figure, 11 is an operation panel. Into the operation panel 11 are inserted a display 13 consisting of a liquid crystal display element etc. that displays various displays, and a plurality of types of disks with different diameters, such as a small diameter disk (S) and a large diameter disk (L). An insertion port 12 is provided. This operation panel 11 is attached to the front of the player main body (H), and is configured to operate each function of the player main body (H).

The player body (H) will be explained in detail using FIGS. 2 to 9.

FIG. 2 is a plan view of the main body (H) of the apparatus, and FIG. 3 is a side view thereof.

In FIGS. 2 and 3, reference numeral 14 denotes a drive roller whose diameter gradually increases toward both ends so as not to pinch the center of the large-diameter disk (L). One end of this drive roller 14 is pivotally supported by one side chassis 15a, and a gear 16 is attached to the other end. This gear 1
Reference numeral 6 indicates various gears 18 for transmitting the rotational force of the motor 17 provided on the other side chassis 15b, as shown in FIG.
．． The motor 17 is designed to mesh with the motor 18...
The roller 14 is rotated by the rotational force of the drive roller 14 to drive the drive roller 14.

The other side of the driving roller 14 is shown in FIGS. 5 and 9 (
This is a plastic facing member 14a as shown in FIG. 9(a) and FIG. 9(b). The lower end of this opposing member 14a has a central portion that is concave upward. This concave shape is opposed to the change in diameter of the drive roller 14. As shown in FIG. 5, the drive roller 14 pinches the disk with the opposing member 14a with a predetermined spring pressure during the disk retraction operation, and after the disk is completely inserted, it moves downward as shown by the dotted line. It's like running away. Note that the above-mentioned opposing member 1
4a does not rotate, and the disk fed by the drive roller 14 simply slides. However, as with the driving roller 14, it is also possible to use a roller having a shape that gradually becomes thicker at both ends as the opposing member 14a. In the disk retraction operation by the drive roller 14 and the facing member 14a, when a large diameter disk (L) is used, as shown in FIG. It is designed to be driven by position. Therefore, the large diameter disk (L
) can be strongly clamped, and the disk can be pulled in by a stronger driving force. Also, when using a small diameter disk (S), as shown in Figure 9(b),
Since the small-diameter disk (S) is driven at a narrow position on the center side of the drive roller 14, the small-diameter disk (S) cannot be strongly clamped. Therefore, the disk is drawn in with a force weaker than the driving force used when driving the large-diameter disk (L).

20 is a disk drive unit. This disk drive unit 20 includes four dampers 19a and 19b for vibration absorption attached to both side chassis 15a and 15b.
(two not shown). Due to the presence of this damper, the disk drive unit 20 is protected from vehicle body vibrations and impacts when used in a vehicle.

As shown in FIG. 4 (top view) and FIG. 5 (side view), the disk drive unit 20 is an optical pickup that picks up signals written on a small diameter disk (S) or a large diameter disk (L). A turntable 23 for rotating a disk (S) or (L) is attached to a lower chassis 22 provided with a mechanism 21. Also, it is rotatably attached to one end of the lower chassis 22, and is always supported by a spring 24.
On the upper chassis 25, which is being pulled toward the lower chassis 22 by
6, and a regulating piece 27 for regulating the clamper 26 from descending onto the turntable 23.

This regulating piece 27 includes a special part 27a for tilting the upper chassis 25 upward and waiting until the disc (S) or (L) is pushed onto the turntable 23; An inclined part 27b is provided adjacent to the inclined part 27b, and a release pin 28 for releasing the clamp slides against this inclined part 27b when ejecting the disk (S) or (L). It has become. This release pin 28 is adapted to be driven in the left-right direction in FIG. 5 by a rack mechanism or the like that meshes with one of various gears 18, 18, . . . provided on the side chassis 15b. When the release pin 28 is located at the position shown by the solid line in FIG. 5, the upper chassis 25 is lifted and the clamp is released, and when the release pin 28 moves to the right as shown by the dotted line in FIG.
is moved downward by the force of the spring 24, and the disk is clamped.

Note that a stopper is provided on the surface of the upper chassis 25 facing the lower chassis 22 (that is, the lower surface of the upper chassis 25) to prevent the disks (S) and (L) from entering deeper than a predetermined position. A member 30 is provided. As shown in FIG. 4, this stopper member 30 is composed of two arms 31 and 32 that are partially overlapped and arranged symmetrically. A rotation shaft 29, which is fixed to the upper chassis 25 and serves as the center of rotation of both the arms 31 and 32, is passed through the overlapped position of the arms 31 and 32. Further, at the position where the arms 31 and 32 overlap, an elongated hole 33 having a stepped portion 33a on the arm 31 side and an elongated hole 34 having a stepped portion 34a on the arm 32 side are provided. is adapted to be engaged by a lock release means to be described later.

The arm 31 is provided with a contact pin 35 that protrudes toward the lower chassis 22 and directly contacts the disk (S) or (L), and the arm 32 also includes a contact pin 35 that directly contacts both disks. 36 are provided. A spring member 37 is provided on the arms 31 and 32 so as to pull the abutment pins 35 and 36 toward each other. As shown in FIG. 4, when both abutment bins 35 and 36 are at the closest position due to the spring member 37, one abutment bin 35 and the side chassis 15a (second
(see figure) is made narrower than the radius of the small-diameter disk (S), and similarly, the distance between the other contact bin 36 and the side chassis 15b is also made narrower than the distance with the disk (S). is set to . This is because when a small-diameter disk (S) is inserted at a position off the center of the insertion slot 12, as shown in FIG. This is to ensure that. Furthermore, the spring member 37 has a small diameter disk (
The drive roller 14 pushes the disk (L) which is stronger and has a larger diameter than the driving force when the drive roller 14 pushes the disk S).
The arms 31 and 32 are set to be attracted to each other with a force weaker than the driving force used to push the arms 31 and 32 together. In other words, the stopper member 30 supports the small-diameter disk (S) at the front when the small-diameter disk (S) is inserted, and the abutment pins 36 support the small-diameter disk (S) when the large-diameter disk (L) is inserted. Bins 35 and 36 support a large diameter disk (L) at the rear.

Here, the above-mentioned lock release means will be explained using FIGS. 4 and 5.

Reference numeral 41 denotes a support lever that supports at one end the engagement pin 42 whose shaft passes through the elongated holes 33 and 34 described above. The other end of this support lever 41 has a notch 2 provided in the lower chassis 22.
An extending shaft 43 is provided that extends downward from the lower chassis 22 from 2a, and the support lever 41 is configured to rotate around this extending shaft 43.

44 is arranged so as to be always perpendicular to the support lever 41, and is integrated with the support lever 41 to extend the shaft 43.
It is an engagement lever that rotates around . This engagement lever 44 engages with the above-described clamp release bin 28.

One end of this engagement lever 44 has a curved portion 44a that curves approximately 45 degrees toward the clamp release bin 28 side, and this curved portion 44a.
A first bent portion 44b bent downward on the side facing the clamp release bin 28, and this first bent portion 44b.
further forward and parallel to the length direction of the clamp release bin 28,
The second bent portion 44c is also bent downward by approximately 45 degrees.
and is provided. Further, a spring member 45 whose one end is fixed to the lower chassis 22 is attached to the engagement lever 44, and the engagement lever 44 and the support lever 41 are always biased in the direction of arrow X by this spring member 45. There is.

The lock release means consisting of such levers 41 and 44 can be used when a large diameter disk (L) is used, that is, when the engagement pin 42 is provided in the step portions 33a and 34a provided in the elongated holes 33 and 34, respectively. When the arms 31 and 32 are engaged with each other to lock the arms 31 and 32, this locked state is released when the disks (S) and (L) are ejected. This release operation is performed when the clamp release bin 28, which moves during the disc ejection operation, engages the engagement lever 44.
This is done by pressing .

The disc loading and unloading operations of the disc player according to the present invention described above will be explained.

When a small-diameter disk (S) is used, each arm 31 and 32 has a spring 3 as shown in FIG. 7(a) to e).
7, and the support lever 41 and the engagement lever 44 are rotated clockwise, ie, are prevented from moving from their initially set positions. Therefore, the abutment bottles 35 and 36 have moved toward the insertion port 12 side. At this time, when a small-diameter disk (S) is inserted and pulled in by being squeezed by the drive port roller 14 and the opposing member 14a,
Two points on the outer periphery of this disk (S) are the contact pins 35 and 36.
corresponds to Since the small diameter disk (S) is held between the drive roller 14 and the opposing member 14a in the state shown in FIG. 9(b) (the small diameter portion of the drive roller 14), its feeding force is weak. Therefore, the disk (S) is in contact with the bin 35.
and 36, arms 31 and 32 remain attracted by spring 37. Therefore, the small diameter disk (S) is positioned by the abutment pins 35 and 36,
The center of the disk (S) is made to substantially coincide with the top of the turntable 23. When the detection means detects that the disk (S) has moved to this position, the release pin 28 is driven in the y direction in FIG. 4 by the driving force of the motor. Therefore, the release pin 28 separates from the regulating piece 2 (see FIG. 5), and the upper chassis 25, which had been lifted by the release pin 25, is lowered by the force of the spring 24, and the clamper 26 and turntable 23 release the disc (S). is clamped. In conjunction with this operation, the drive roller 14 is lowered to the position shown by the dotted line in FIG. When the disk (S) is ejected, the release bin 28 is driven in the opposite direction to the y direction, and the release bin 28 lifts the upper chassis 25 and releases the clamp. Further, the drive roller 14 rises, and the disk (S) is ejected to the insertion slot 12 by the rotational force of the drive roller 14.

When a small-diameter disk (S) is used as described above, since the engagement lever 44 is in the clockwise rotated position, the release bin 28 is moved as shown in FIG. 5 as the disk is loaded and ejected. When the release bin 28 is driven in the left and right direction,
simply passes through the side of the engagement lever 44.

In addition, when using a large diameter disk (L), Fig. 8 (a)
) to g), the contact bins 35 and 36
When a large-diameter disk (L) comes into contact with the large-diameter disk (L), the driving force of the drive roller 14 that drives this large-diameter disk (L) is stronger than the force of the spring member 37 that draws the arms 31 and 32 together. The contact bottles 35 and 36 are pushed to the back. The arms 31 and 32 then begin to rotate about the rotation shaft 29. At this time, the long holes 33 and 3
The stepped portions 33a and 34a provided in 4 coincide with each other, and for the matched stepped portions 33a and 34a,
An engagement pin 42 that is always urged forward by a spring 45
are fitted, and arms 31 and 32 are locked (eighth
Figure (d) state), therefore, the large diameter disk (L)
Even if the disc (L) cannot go any deeper and the drive roller 14 descends and is no longer able to apply driving force, the disc (L) is supported in this position by the arms 31 and 32 without being pushed forward. . At this time, the center of the large diameter disk (L) supported at two points by the abutment pins 35 and 36 substantially coincides with the turntable 23. When the detection means (not shown) detects that the large diameter disk (L) is held, the clamp release pin 2
8 crosses over the second bent portion 44c and extends the shaft 43
side (y direction in FIG. 5) and detach from the regulating piece 27.
The upper chassis 25 is lowered by the spring 24, and the disc is pressed and clamped onto the turntable 23 by the clamper 26. You can play in this state.

Next, when an external operation is performed to eject the large diameter disc (L) from the playing state, the clamp release pin 28
moves forward and comes into contact with the first bent part 44b (the state shown in FIG. 8(f)), and when it moves further, the first bent part 44
b is pressed to disengage the engagement pin 42 from the stepped portions 33a and 34a (the state shown in FIG. 8(g)). Then, since the arms 31 and 32 are always urged by the spring member 37 so that the abutting pins 35 and 36 approach, the stopper member 30 returns to its initial state. Further, the disk (L) is ejected by the drive roller 14.

As described above, by changing the positions of the pair of abutment bins 35 and 36, the small diameter disk (S) or the large diameter disk (L) can be reliably guided onto the turntable 23. Note that when the disk is guided and the upper chassis 25 is lowered and clamped, it is preferable that the abutment bins 35 and 36 separate from the outer periphery of the disk (S) or (L). To do this, adjust the length dimensions of the abutment pins 35 and 36 so that the disc (S) or (L)
At the height position where the disk is being fed by the disk, the abutment bottles 35 and 36 are in contact with the outer periphery of the disk, and the disk (S) or (L) is in contact with the outer circumference of the disk.
) is at a height position where it is completely clamped to the turntable 23, it is necessary to keep the outer periphery of the disk away from the tips of the abutment pins 35 and 36. Alternatively, the bottles 35 and 36 may be caused to escape from the outer periphery of the disk by the locus of the abutment pins 35 and 36 rotating downward as the upper chassis 25 descends during the clamping operation. It is possible.

Furthermore, when playing by inserting a small-diameter disc (S) from the insertion slot 12, no matter what position the small-diameter disc (S) is inserted from, that is, the position adjacent to the side chassis 15a as shown in FIG. The disk (S) can be guided to the central position of the passage. This is because the distance between the contact bin 35 that contacts the small diameter disc (S) and the side chassis 15a is arranged to be narrower than the radius of the small diameter disc (S), and at this time, the disc (S)
) is pinched by the large diameter portion of the drive roller 14, while the other end is located at the small diameter portion of the drive roller 14, so the retraction force of this sharpener is equal to the force of the large diameter disk (L). The arms 31 and 32 are now smaller than before, and the arms 31 and 32 are prevented from expanding due to the insertion force exerted by the drive roller 14. Therefore, when the small-diameter disk (S) comes into contact with the abutment pin 35, the small-diameter disk (S) is guided by the abutment pin 35 so that the traveling direction of the small-diameter disk (S) advances toward the center. Eventually, it also comes into contact with the abutment pin 36, and both of the abutment pins 35 and 36 come into contact with the small diameter disk (S). in this way,
Since the arms 31 and 32 trigger each other with a force stronger than the driving force of the drive roller 14 for the small diameter disc (S), the small diameter disc (S) is reliably guided to the center and the disc (S) is adapted to stop at a position placed on the turntable 23.

In this way, no matter which disc (S) or (L) is used, the discs (S) and (L) can be stopped at the same position on the turntable 23, and the subsequent operation can be controlled by either disc (S). ) and (L) can be similarly performed. Therefore, any disc (
S) and (L) can also be played. Furthermore, since it is okay to insert a particularly small-diameter disk (S) from a position off the center of the insertion slot 12, it becomes easier for the driver to perform a loading operation when inserting a disk in a vehicle-mounted disk player.

Further, in the above embodiment, the pair of arms 31 and 32 and the lever 41.
The stopping positions of 44 are different. Therefore, if it is detected by a switch or the like that these members are on either side, it is possible to recognize the type of disc loaded. Recognizing this switch etc. enables various controls. For example, display 1 shown in FIG.
3. Set the disc type to "Single J, rSINGLEJ".
Alternatively, the display 13 can display a long line or a short line, and the length of the line can be used to identify the diameter of the disc. Alternatively, the disc diameter can be identified by lighting an LED. It is also possible to display the type of

In addition, in this embodiment, in order to be able to play with both discs (S) and (L), the stopper member 30 is formed by two arms 31 and 32,
Although the arms 31 and 32 are designed to rotate only when a large-diameter disk (L) is used, the present invention is not limited to this. and a stopper member for
Only the stopper member for small diameters may be moved, or the stopper member may be moved in a straight line to move the disc (
It may be locked in two positions corresponding to S) and (L). It is also possible to receive two points on the outer periphery of the disk at the sides of a pair of arms arranged in a V-shape. In other words, the stopper member is a disc (
A similar effect can be obtained if a structure is adopted in which the discs (S) and (L) can be locked according to their diameters and both discs (S) and (L) can be placed on the turntable 23.

〔Effect of the invention〕

According to the present invention as described above, disks having different diameters can be inserted through the same insertion opening and placed on the turntable of the disk drive mechanism without using an adapter. In addition, by setting the resistance force of the stopper member in accordance with the disk feeding force by the drive roller, and by using a drive roller whose diameter changes, the feeding force is changed between large diameter disks and small diameter disks. By simply feeding the disk with a motor, it is possible to reliably load the disk regardless of whether it is small or large. Furthermore, in the case of a large-diameter disk, by making it possible to hold the stopper member at the back side of the passage, no pushing force is applied by the stopper member during loading of the disk. Furthermore, by making the stopper member touch the disc at two points across the disc path, even if a small-diameter disc is inserted off-center in the insertion slot, it can be loaded securely onto the turntable. become.

[Brief explanation of the drawing]

1 to 9 show embodiments of the invention. Fig. 1 is a front view showing the operating section of the disc player, Fig. 2 is a plan view of the player body, Fig. 3 is a side view thereof, Fig. 4 is a plan view of the disc drive unit, and Fig. 5 is a side view thereof. , FIG. 6 is a plan view of the player main body showing the insertion state of a small diameter disc, FIGS. 7(a) to (e) are plan views showing the insertion operation of a small diameter disc in order, and FIGS. 8(a) to ( g) is a plan view showing the insertion operation of a large-diameter disk in order; FIGS. 9(a) and (b) are front views showing the drive roller and opposing member; FIG. 10 is a conventionally used adapter for small-diameter disks. FIG. S...Small diameter disk, L...Large diameter disk, 1
2... Insertion port, 14... Drive roller, 23... Turntable, 25... Upper chassis, 26... Clamper, 28... Clamp release pin, 31.32...
- Arm, 35.36...Abutment pin, 41...Support lever, 44...Engagement lever. 1: Fig. 5 14, Drive 0-L 140 ・Light direction part is 23 T) Child-7'L 2S
L γ-shi 26 Crush/knee 28 Cra; Aluminum leftover Fig. 9 (0) +4a (S”) Fig. 10 Fig. 8 (Q) Fig. 8 (c) Fig. 8 (b) Fig. 8 Figure (d)

Claims (1)

[Claims] 1. A disc player that is provided with an insertion opening into which discs of different diameters are inserted and a disc drive mechanism located at the back of the insertion opening, wherein a disc of a small diameter is inserted into the disc insertion passage. A disc player 2 is provided with a stopper member that is located at a position to prevent the disc from coming off the disc drive mechanism and entering the inner part of the passage, and that can move to the inner part of the disc insertion passage when a large-diameter disc is inserted. A disc player is equipped with an insertion slot into which discs of different diameters are inserted, and a disc drive mechanism located at the back of the slot, and the disc player has a disc player with a disc drive mechanism located at the back of the slot, in which the diameter does not become thicker toward both ends in front of the disc drive mechanism. A disk feeding mechanism is provided in which the disk is pinched and pulled in using a drive roller formed in the disk drive mechanism. A stopper member is provided, which is located at a position that prevents the disk from moving toward the back of the disk insertion path when a large-diameter disk is inserted, and the resistance force exerted when the stopper member moves toward the back is ,
The disk player 3 is set to have a feeding force stronger than the feeding force when a small-diameter disk is drawn in by the disk feeding mechanism and weaker than the feeding force when a large-diameter disk is drawn in, and the stopper member prevents the insertion of the large-diameter disk. 3. The disk player 4 and stopper according to claim 1, wherein the stopper member is locked at a position that prevents the large-diameter disk from coming off the disk drive mechanism and moving toward the back of the passage. 4. The disc player 5 according to claim 1, wherein the member is disposed at a position facing the outer periphery of the disc at two points sandwiching the center of the disc insertion passage, and the stopper member sandwiches the center of the disc insertion passage. The stopper member is placed at two points facing the outer periphery of the disc, and provides resistance when the stopper member moves toward the back when a small-diameter disc is inserted into the insertion slot from a position off the center of the insertion slot. 3. The small-diameter disk is fed in such a way that the outer periphery of the small-diameter disk hits the stopper member at two points and the small-diameter disk is positioned at the center of the disk insertion path. disc player