JP2003331495A - Erroneous insertion preventing device for disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an erroneous insertion preventing device for a disk player suitable for making thinner while the deformation of a detecting pin is surely prevented by the simple constitution. <P>SOLUTION: When retracting holes 2a and guide holes 2b are provided on a supporting plate 2 fixed at the upper surface of a chassis 1 and a desired disk D is arranged on a driving mechanism M, the detection pins 3 are restricted to the initial positions by a restricting member formed on a roller bracket and also upper ends of supporting shafts 3a positioned at free ends of the detection pins 3 are arranged so as to confront with the retracting holes 2a. By such arrangement, when an erroneously inserted another disk D is forcibly pushed in by the user, the free ends of the detection pins 3 are restrained on outer edge parts of the retracting holes 2a, so that the detection pins 3 has the pseudo both ends supported structure. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a CD (compact disc) and a DVD (digital versatile disc).
The present invention relates to a disc player for recording and / or reproducing a disc and the like, and more particularly to an erroneous insertion prevention device for a disc player that prevents the insertion of another disc when one disc is inserted in the housing. .

[0002]

2. Description of the Related Art Generally, in a vehicle-mounted disc player, a desired disc has already been inserted into the casing because an insertion opening for inserting / discharging the disc into / from the casing is formed in a slit shape. Sometimes, another disc may be mistakenly inserted from the insertion slot. In order to prevent such an erroneous insertion (double insertion) of a disc, the applicant of the present application discloses in Japanese Patent Application Laid-Open No. 8-180540 that a detection means for detecting the insertion of a disc is used to prevent the insertion of another disc. We have proposed a wrong insertion prevention device.

FIGS. 5 to 8 are for explaining the conventional erroneous insertion prevention device disclosed in the above publication, FIG. 5 is an exploded perspective view of the erroneous insertion prevention device, and FIG. 6 is a plan view showing a disc inserting operation. 7 is a plan view showing the inserted state of the disc, and FIG. 8 is an operation explanatory view of the restraint member provided in the erroneous insertion prevention device.

The conventional erroneous insertion prevention device shown in these figures is applied to an on-vehicle CD player as an example of a disc player, and this CD player has a chassis 10 and a support plate 11 constituting a casing. I have it. Left and right side plates 10a are bent and formed on the bottom surface of the chassis 10, and a front plate (not shown) attached to the front of the chassis 10 has an insertion opening for inserting / ejecting the disk D into / from the housing. It is opened like a slit. Support plate 11
Is fixed to the upper surface of the chassis 10, and the support plate 1
A guide top 12 and a roller 13 which form a transport mechanism for the disc D are disposed below the first disc 1. The guide top 12 is made of a synthetic resin material having a small friction coefficient, and is provided with a pair of support shafts 12a at its center position and a pair of elastic pieces 12b facing each other through a straight line connecting the support shafts 12a. . On the other hand, a pair of support holes 11a are provided at the center position of the support plate 11, and by inserting the support shaft 12a into these support holes 11a and bringing the tip of the elastic piece 12b into contact with the lower surface of the support plate 11, The guide top 12 is rotatably supported on the lower surface of the support plate 11 and maintains a horizontal posture.

As shown in FIG. 8 (A), the roller 13 is opposed to the lower surface of the guide top 12, and the disk D carried in from the insertion port is in contact with the lower surface of the guide top 12 and the roller 1.
It is sandwiched between 3 and. Both ends of the support shaft 13a of the roller 13 are rotatably supported by support pieces 14a of the roller bracket 14, and a gear 15 is fixed to one end of the support shaft 13a.
Power from a motor provided in the chassis 10 is transmitted from a gear train (not shown) to the gear 15, and the support shaft 13a and the roller 13 are integrally driven to rotate in both forward and reverse directions. The roller bracket 14 is bent and formed in a U shape by a sheet metal, and a pair of restraining members 14d facing toward the insertion opening of the disc D are projected at a predetermined interval on a connecting piece 14c connecting both supporting pieces 14a. Has been formed. A shaft 14b provided on both supporting pieces 14a of the roller bracket 14 is rotatably supported by the side plate 10a of the chassis 10. By urging the roller bracket 14 with a spring 16, the roller 13 is always guided. It is urged in a direction in which it is pressed against the lower surface of the top 12.

As shown in FIGS. 6 and 7, a driving mechanism M is disposed inside the chassis 10 at the inner side of the conveying mechanism (guide top 12 and roller 13). , A turntable T on which the central portion of the disk D is installed, and a spindle motor for rotating the turntable T,
A clamper (not shown) for clamping the center of the disk D to the turntable T, an optical head H, and the like are provided. Further, a pair of detection pins 17 for detecting the insertion of the disk D are located at a position closer to the insertion opening than the transport mechanism.
The base portions 17a of the detection pins 17 are rotatably supported by a shaft 18 fixed to the bottom surface of the chassis 10. Furthermore, both detection pins 17 are spring 1
The return biasing is performed in the direction in which the two are closer to each other by 9, and the detection biasing distance between the detection pins 17 is such that the detection biasing pins 17 are in contact with the stopper 20 provided on the bottom surface of the chassis 10. Is set to have a predetermined dimension W. The facing distance W is the diameter (12 mm) of the disc (compact disc) D loaded in the disc player.
cm), and when the disc D is inserted, both detection pins 17 always slide in the outer peripheral edge portion of the tip of the disc D and move in the (a) direction to detect both. When a switch (not shown) electrically detects that both pins 17 have moved (rotated) in the direction (a) by a predetermined distance, it is detected that a predetermined disc D has been inserted.
This disc player accepts only a disc having a diameter of 12 cm, and when a disc having a diameter smaller than this or other foreign matter is inserted, the pair of detection pins 17 simultaneously move a predetermined distance in the direction (a). It never moves. Further, the motor that drives the roller 13 is started only when it is detected that both the detection pins 17 have moved in the (a) direction by a predetermined distance. When inserted, the roller 13 does not rotate.

In the CD player thus constructed,
In the standby state in which the disc D is not inserted, FIG.
As shown in (A), the roller bracket 14 has a shaft 14b.
Is rotated counterclockwise about the fulcrum, and the roller 13 is elastically biased toward the lower surface of the guide top 12 by the biasing force of the spring 16. Further, as indicated by reference numeral (b) in FIGS. 6 and 8A, the detection pin 17 is returned to the initial position where it abuts the stopper 20 by the urging force of the spring 19, and the pair of restraint members 14d. Is apart from the rotation region of the detection pin 17 in the (a) direction. Therefore, when the disc D is inserted into the chassis 10 from the insertion opening in the standby state, the outer peripheral edge on the tip side in the insertion direction of the disc D abuts on both the detection pins 17, and the insertion force of the disc D both The detection pin 17 slides on the circular arc peripheral portion on the tip side of the disk D, and
Move in the direction. And both the detection pins 17 are (a)
When it is electrically detected by a switch (not shown) that it has moved a predetermined distance in the direction, the motor is started and the power is transmitted from the gear train to the gear 15 to support the spindle 13a and the roller 1.
3 rotates integrally. As a result, the front end of the disc D in the insertion direction is sandwiched between the lower surface of the guide top 12 and the roller 13, and the disc D is conveyed into the drive mechanism M by the rotational force of the roller 13.

When the disk D moves toward the drive mechanism M and reaches the position shown by the alternate long and short dash line in FIG. 6, both detection pins 17 slide on the peripheral edge of the disk D and are shown in FIG. Move to position. After that, when the disk D further moves in the direction of the drive mechanism M, both detection pins 17 slide on the arc-shaped outer peripheral edge on the rear side in the insertion direction of the disk D, and the initial position where the disk 20 contacts the stopper 20 by the urging force of the spring 19 ( Return to (b). Both detection pins 17 return to the initial position (b),
Further, the disk D is transported, and the central portion thereof is driven by the drive mechanism M.
Immediately before being clamped to the turntable T of No. 3, the roller bracket 14 is rotated by a retracting mechanism (not shown), and the roller 13 is moved to the disk D as shown in FIG. 8B.
Evacuate downward from the transport position. In this retracted state, the disc D is clamped on the turntable T, and the restraining member 14d formed on the roller bracket 14 projects into the rotation region of the detection pin 17 in the (a) direction. That is, as shown in FIG.
Since d restrains the pair of detection pins 17 from the outside, a new disc D is inserted from the insertion port while the disc D is installed in the drive mechanism M.
Even if the leading end of the disc D in the insertion direction abuts on both detection pins 17, the detection pin 17 is constrained by the constraining member 14d.
Cannot move in the (a) direction, so that another disk D cannot be inserted into the chassis 10 from the position where it abuts the detection pin 17.

When ejecting the disc D which has been reproduced, the clamp of the disc D with respect to the turntable T is first released, and the roller bracket 14 is further released.
8 rotates counterclockwise as shown in FIG. 8A, and the disc D, which has been released from the clamp and is in the free state, is held between the lower surface of the guide top 12 and the roller 13. And
The roller 13 is driven by the motor, and the disc D is ejected from the insertion slot. At this point in time, as shown in FIG. 8A, since the restraint member 14d is out of the rotation region of the detection pin 17, both detection pins 17 are ejected from the disc D.
It slides along the outer peripheral edge of and moves outward along the locus (a), and then returns to the initial position (b) shown in FIG.

[0010]

According to the erroneous insertion prevention device for the disc player according to the above-mentioned conventional technique, the restraint member 14d holds the detection pin 17 when one disc D is inserted in the housing. Since the disc D can be prevented from being inserted by restraining the disc D at the initial position, the disc D can be prevented from being double-inserted by the simple structure of forming the restraining member 14d on the roller bracket 14. However, the detection pin 17 projects upward with a base portion 17a rotatably supported on the bottom surface of the chassis 10 as a fixed end, and the lower side of the detection pin 17 having such a cantilever structure is blocked by the restraining member 14d. Since one disk D is inserted in the housing, if one disk D is abutted against the detection pin 17 and the other disk D whose insertion is blocked is forced to be pushed, Detection pin 17
Is worried that it will bend or break.

For this reason, in the above-described conventional misinsertion preventing device, it is necessary to increase the size of the support structure for the detection pin 17 to increase the mechanical strength. Specifically, the detection pin 17 and the base portion 17a are required. Although the detection pin 17 is prevented from being deformed by the excessive insertion of the disc D by increasing the wall thickness and the dimension, as the disc player is made thinner, such a large support structure is provided. There was a problem that it would be very difficult to incorporate into the mechanism.

The present invention has been made in view of the above-mentioned circumstances of the prior art, and the purpose thereof is to prevent the deformation of the detection pin with a simple structure without fail, and to erroneously insert a disc player suitable for thinning. To provide a protection device.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a housing is provided with an evacuation hole for restricting tilting of the detection pin on the free end side, and when one disk is inserted into the housing, another disk is inserted. The movement locus of the detection pin on the free end side is changed to the retreat hole side by using the insertion force of. If such a retracting hole is provided in the housing, the detection pin will have a pseudo both-ends support structure when the disc is erroneously inserted, so it is possible to reliably prevent the detection pin from being deformed by the erroneously inserted disc. Since it is not necessary to increase the size of the detection pin support structure itself, it is possible to realize a suitable erroneous insertion prevention device when applied to a disc player whose thickness has been promoted.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In a disc player erroneous insertion prevention device according to the present invention, a detection pin that moves by abutting on an outer peripheral edge of a disc inserted in a housing and a fixed end side of the detection pin are supported. A supporting member that moves integrally with the detection pin, a transport mechanism that transports the disc whose insertion is detected by the detection pin, a drive mechanism that drives the disc transported by this transport mechanism, and a disc that is transported to this drive mechanism. The biasing member that returns the detection pin to the initial position when the disc is installed and the detection pin that returns to the initial position when the disc is installed in the drive mechanism are restrained to prevent the insertion of another disc. A restraint member is provided, and an evacuation hole that restricts tilting of the detection pin on the free end side when the detection pin is restrained at the initial position by the restraint member is provided in the housing. It has a configuration that is.

In the erroneous insertion prevention device for a disc player having such a structure, when another disc is inserted while the desired disc is installed in the drive mechanism, the insertion force of the other disc is utilized. The movement locus on the free end side of the detection pin is changed to the retract hole side, and the detection pin has a pseudo both-ends support structure, so the deformation of the detection pin due to another disk that is erroneously inserted is reliably prevented. Since it is not necessary to increase the size of the support structure of the detection pin itself, it is possible to realize a suitable erroneous insertion prevention device when applied to a disc player whose thickness has been promoted.

In the above structure, when the housing is provided with the guide hole for guiding the movement of the detection pin on the free end side, and the withdrawal hole is continuously provided at one end of the guide hole, the disk is not installed in the drive mechanism. When inserting the desired disc in the state,
The detection pin that is not restrained by the restraint member can be moved smoothly along the guide hole, and the free end side of the detection pin can be locked in the retract hole only when another disc is inserted by mistake. preferable.

Further, in the above-mentioned structure, the movement of the support member supporting the fixed end side of the detection pin may be a linear sliding operation, but in order to reduce the movable space of the support member, the support member is provided with a tip portion. It is preferable that the guide hole is formed in an arc shape around the rotation fulcrum of the rotation lever.

[0018]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 is a plan view of a disc player according to an embodiment, FIG. 2 is a plan view showing a state in which a transport mechanism is removed from the disc player, and FIG. 3 is a plan view of essential parts of an erroneous insertion prevention device provided in the disc player. FIG. 4 is an explanatory view showing the positional relationship between the detection pin and the retract hole provided in the erroneous insertion prevention device.

The erroneous insertion prevention device for a disc player according to this embodiment is different from the above-mentioned conventional example (see FIGS. 5 to 8) in that a support plate 2 fixed to the upper surface of the chassis 1 has a retract hole 2a. The guide hole 2b is provided, and when the desired disk D is installed in the drive mechanism M, the free end side of the detection pin 3 is locked in the retract hole 2a by using the insertion force of another disk D. The other configurations are basically the same except that the shapes of the respective members are slightly changed.

That is, the on-vehicle CD player shown as an example of the disc player is provided with the chassis 1 and the support plate 2 constituting the casing, and the drive mechanism M provided inside the casing. Is provided with a turntable, an optical head H, and the like. On the front side (lower side in FIG. 1) of the drive mechanism M, a guide top 4 and a roller 5 which constitute a transport mechanism of the disc D are arranged, and the insertion port side (lower side in FIG. 1) with respect to this transport mechanism. A pair of detection pins 3 for detecting the insertion of the disk D are provided at the position (). One of the detection pins 3 is composed of a metal support shaft 3a implanted at the tip of the rotary lever 6 and a synthetic resin cylinder 3b loosely fitted to the support shaft 3a. A flange portion 3c is formed on the upper end of the cylindrical body 3b. The other detection pin 3 has the same structure.

As shown in FIG. 2, the two rotary levers 6 have a shaft 6
Both detection pins 3 which are rotatably supported on the bottom surface of the chassis 1 around a and are erected on these rotation levers 6
Are urged by a biasing member composed of a slider 7 slidably supported by the chassis 1 and a spring 8 so that the slider 7 and the spring 8 are closer to each other. Here, both sliders 7 are engaged with the lower end portion of the support shaft 3a, and these sliders 7 are biased by springs 8 so as to be closer to each other. The contact distance between the two detection pins 3 is set to be a predetermined dimension in the state of being in contact with the stopper. A step portion 6b is formed on each of the rotating levers 6, and the step portion 6b is formed.
The actuator portion of the switch (not shown) faces b. Then, when the detection pin 3 and the rotation lever 6 start to rotate, the switch is operated by the step portion 6b,
It is possible to detect that the disc D is inserted. Further, the roller 5 is rotationally driven in both forward and reverse directions by using a motor (not shown) provided in the chassis 1 as a drive source. The roller bracket 9 that pivotally supports the roller 5 is mounted on the side plate of the chassis 1. It is rotatably supported. On the roller bracket 9, a pair of restraint members 9a directed toward the insertion opening of the disc D are formed so as to project at predetermined intervals. By biasing the roller bracket 9 upward by a spring (not shown), The roller 5 is always urged in the direction of being pressed against the lower surface of the guide top 4.

As shown in FIG. 3, the support plate 2 fixed above the chassis 1 is provided with a pair of guide holes 2b. The guide holes 2b are centered on the shaft 6a of the rotating lever 6. It extends in an arc shape. The free ends of the detection pins 3 (that is, the upper ends of the support shafts 3a) are inserted into the guide holes 2b, respectively, and the detection pins 3 rotate along the guide holes 2b as the disc D is inserted or ejected. Move. The flange portions 3c of both the detection pins 3 are formed to have a diameter larger than the width dimension of the guide hole 2b.
By making contact with the lower surface of the, the vertical movement of both detection pins 3 is restricted. Further, retreat holes 2a are formed at inner end portions of the both guide holes 2b facing each other, and these retreat holes 2a extend in the normal direction of the disk D that abuts both the detection pins 3 restrained at the initial position. It is extended.

In the CD player having the above general structure, in the standby state where the disc D is not inserted,
The roller bracket 9 is rotated upward, and the roller 5
Is elastically biased toward the lower surface of the guide top 4 by the biasing force of a spring (not shown). The detection pin 3 is returned to the initial position by the urging force of the urging member (slider 7 and spring 8). As shown in FIG. 4A, the upper end of the support shaft 3a of the detection pin 3 is a guide. It is located at the inner end of the hole 2b and faces the evacuation hole 2a. Further, since the roller bracket 9 is rotated in the upward direction, the pair of restraining members 9a are separated from the rotation region of the detection pin 3.
Therefore, in this standby state, as shown in FIGS. 1 and 3, when the disc D is inserted into the housing from the insertion opening, the outer peripheral edge of the disc D in the insertion direction of the detection pins 3 is at the tip end side. The detection pin 3 contacts the cylindrical body 3b and is rotated by the insertion force of the disk D so that both detection pins 3 expand outward. At this time, the upper end of the support shaft 3a moves outward from the inner end of the guide hole 2b, but the guide hole 2b extends in an arc shape around the shaft 6a of the rotation lever 6 that supports the detection pin 3. Therefore, the upper end of the support shaft 3a can smoothly move in the guide hole 2b. When both the detection pins 3 have moved a predetermined distance (the rotation lever 6 has rotated a predetermined angle) is electrically detected by the switch (not shown), a motor (not shown) is also started. The roller 5 rotates. As a result, the leading end of the disc D in the insertion direction is sandwiched between the lower surface of the guide top 4 and the roller 5, and the rotational force of the roller 5 causes the disc D to drive the drive mechanism M.
Is transported inward.

When the disc D is conveyed in the direction of the drive mechanism M, both detection pins 3 slide on the arc-shaped outer peripheral edge on the rear side from the front end side in the insertion direction of the disc D, and the conveyance of the disc D is completed. At this point, the urging force of the urging member (slider 7 and spring 8) returns to the initial position. And
Immediately before the center portion of the disc D is clamped to the turntable of the drive mechanism M, the roller bracket 9 is rotated downward by a retracting mechanism (not shown), and the roller 5 is retracted downward from the transport position of the disc D. In this retracted state, the disc D is clamped on the turntable, and the restraint member 9a of the roller bracket 9 enters the rotation region of the detection pin 3 as shown in FIG.
Both the restraint members 9a sandwich the pair of detection pins 3 from the outside, and the rotation of the detection pins 3 is blocked by the restraint members 9a.

As described above, when the user inserts another disc D from the insertion port while the disc D is already installed in the drive mechanism M, the leading end of the disc D in the inserting direction comes into contact with both detection pins 3. However, since the detection pin 3 constrained by the constraining member 9a cannot move to the outside, another disc D cannot be further inserted into the housing from the position where it abuts the detection pin 3. At that time, if the user has another disc D
If the force is inserted into the housing, the insertion force slightly tilts the detection pin 3 in the normal direction of the disk D, so that the upper end of the support shaft 3a is guided by the guide hole 2b, as shown in FIG. 4B. It enters into the evacuation hole 2a from the inner end of the. That is, the movement locus of the detection pin 3 on the free end side is changed to the retracting hole 2a side, and the upper and lower ends of the detecting pin 3 are supported by the outer edge portion of the retracting hole 2a and the rotating lever 6 so as to support both ends in a pseudo manner. Because of the structure, it is possible to reliably prevent the detection pin 3 from being bent by another disk D that is erroneously inserted.

When ejecting the disc D which has been reproduced, the disc D for the turntable is first ejected.
When the clamp is released and the roller bracket 9 is further rotated in the upward direction, the released disc D is clamped by the lower surface of the guide top 4 and the roller 5. Then, the motor drives the roller 5, and the disc D is ejected from the insertion slot. At this point in time, the restraint member 9a is out of the rotation region of the detection pin 3, so that both detection pins 3 slide on the outer peripheral edge of the ejected disc D and once move to the outside, and then move to the initial position. Return.

In the erroneous insertion prevention device according to the above-described embodiment, the support plate 2 which is a component of the housing is provided with the withdrawal hole 2a, and when the desired disk D is installed in the drive mechanism M, the detection pin 3 is provided. Is constrained to the initial position by the constraining member 9a, and the free end (upper end of the support shaft 3a) of the detection pin 3 is made to face the retracting hole 2a. The free end of the detection pin 3 is locked to the outer edge of the retreat hole 2a, so that the detection pin 3 can have a pseudo both-end support structure. Therefore, even if the user tries to force another disc D that is erroneously inserted, the detection pin 3 can be reliably prevented from being greatly deformed and bent, and the support structure itself of the detection pin 3 is large. Since it is not necessary to reduce the number of components and the number of components does not increase, it is possible to realize a suitable erroneous insertion prevention device when applied to a disc player whose thickness has been promoted. Further, since the support plate 1 is provided with the guide hole 2b for guiding the movement of the detection pin 3 on the free end side, and the retreat hole 2a is formed at the inner end portion of the guide hole 2b, the insertion / insertion of the normal disc D / At the time of discharging, the support shaft 3a of the detection pin 3 which is not restrained by the restraint member 9a can be smoothly moved along the guide hole 2b.

In the above embodiment, the case where the restraint member is integrally formed with the roller bracket that pivotally supports the roller has been described. However, the restraint member returns to the initial position when the disc is installed in the drive mechanism. Anything may be used as long as the detection pin can be constrained so as not to move, and the point is that the detection pin can be moved to the position where the detection pin is constrained in conjunction with the clamp operation of the drive mechanism.

Further, in the above embodiment, the case where a pair of detection pins is used has been described, but it is possible to detect the insertion of the disc by only one of the detection pins and prevent the wrong insertion of another disc. You can In this case, one evacuation hole and the guide hole can be omitted as a matter of course.

[0030]

The present invention is carried out in the form as described above, and has the following effects.

Since the detection pin is constrained to the initial position by the constraining member when the desired disc is installed in the drive mechanism, it is possible to prevent double insertion of another disc by mistake. Moreover, since the housing has the retracting hole for restricting the tilt of the detection pin on the free end side, the detection pin has a pseudo both-ends support structure when the misinserted disc is forced to be pushed. be able to. Therefore, not only is it possible to reliably prevent the detection pins from being deformed by the incorrectly inserted disc, but it is not necessary to increase the size of the detection pin support structure itself. A suitable erroneous insertion prevention device can be realized.

[Brief description of drawings]

FIG. 1 is a plan view of a disc player according to an embodiment.

FIG. 2 is a plan view showing a state in which a transport mechanism is removed from the disc player.

FIG. 3 is a plan view of a main part of an erroneous insertion prevention device provided in the disc player.

FIG. 4 is an explanatory diagram showing a positional relationship between a detection pin and a retract hole provided in the erroneous insertion prevention device.

FIG. 5 is an exploded perspective view showing an erroneous insertion prevention device for a disc player according to a conventional example.

FIG. 6 is a plan view showing a disc insertion operation in the erroneous insertion prevention device.

FIG. 7 is a plan view showing a disc insertion state in the erroneous insertion prevention device.

FIG. 8 is an operation explanatory view of a restraint member included in the incorrect insertion prevention device.

[Explanation of symbols]

2 Support plate (case) 2a Retreat hole 2b guide hole 3 detection pins 3a spindle 3b cylinder 3c Tsuba part 4 Guide top 5 roller 6 Rotating lever 6a axis 7 slider 8 springs 9 Roller bracket 9a Restraint member M drive mechanism D disk

Claims (3)

[Claims] 1. A detection pin that moves by contacting with an outer peripheral edge of a disk inserted in a housing, and a support member that supports a fixed end side of the detection pin and moves integrally with the detection pin.
A transport mechanism that transports the disc whose insertion is detected by the detection pin, a drive mechanism that drives the disc transported by this transport mechanism, and the detection pin to the initial position when the disc is transported to this drive mechanism. A biasing member for returning and a restraint member for restraining the detection pin returned to the initial position when the disc is installed in the drive mechanism to prevent the insertion of another disc, wherein the detection pin is An erroneous insertion prevention device for a disc player, wherein a retracting hole that restricts tilting of the detection pin on the free end side when restrained at an initial position by a restraining member is provided in the housing. 2. The guide hole according to claim 1, wherein the housing is provided with a guide hole for guiding the movement of the detection pin on the free end side, and the withdrawal hole is continuously provided at one end of the guide hole. An erroneous insertion prevention device for a disc player, which is characterized in that 3. The support member according to claim 2, wherein the support member is a rotation lever that supports the detection pin at a tip end portion,
An erroneous insertion prevention device for a disc player, wherein the guide hole is formed in an arc shape around a rotation fulcrum of the rotation lever.