Optical disk player capable of monitoring the optical disk status

An optical disk player, which comprises: a shell, a plummer fixed in the shell, an optical disk transport mechanism, a guiding mechanism, an optical disk loading final position detection mechanism, and a control part; the shell is 80-90 millimeters wide at the optical disk insertion direction; the detection parts of the guiding mechanism are located between the plummer and the delivery roll of the transport mechanism; the optical disk loading final position detection mechanism comprises a support part and a trigger bar; one end of the support part is rotatablely fixed to the upper base plate near the detection part of one detection bar, and its middle is provided with an assorted part interacting with the detection bar; the middle of the trigger bar is rotatablely fixed to the free end of the support part, of which one end is provided with a contact part for contacting the periphery of an optical disk, and the other end is connected to the control part. When an optical disk is at the playing position, a part of the optical disk will be exposed out of the shell of the optical disk player, so, when the optical disk is played, the status of the optical disk in the optical disk player can be intuitively seen from the outside.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention involves an optical disk player especially involves an optical disk player that transports the optical disk inserted from the insertion inlet to the playing position via a delivery roll.

2. Description of the Related Art

In an existing optical disk player, when the optical disk gets to the playing position, the whole optical disk is entirely contained in the player, and the status of the optical disk being played can not be seen from the outside. Especially for that kind of optical disk players which transports the optical disk to the playing position via a delivery roll, for the internal structure is complicated, the shell of the optical disk player can not be made less than the outer diameter of the optical disk. For example, a Japanese patent application with the publication number of 2008-135106 (P2008-135106A) disclosed such an optical disk playing device.

SUMMARY OF THE INVENTION

The technical problem of the present invention to solve is to provide an optical disk player, in which while an optical disk is played, the status of the optical disk in the optical disk player can be seen from the outside.

To solve the above mentioned technical problems, the optical disk player of the present invention comprises: a shell, a plummer fixed in the shell, a transport mechanism for transporting the optical disk between the optical disk insertion inlet and the plummer, a guiding mechanism for guiding the optical disk to the center of the transport path, an optical disk loading final position detection mechanism, and a control part for controlling a chuck plate to keep the optical disk on the plummer and canceling the holding of the transport mechanism to the optical disk when an optical disk being transported to be above the plummer, characterized in that:

the shell is composed of an upper base plate and a lower base plate, and a clearance used as the optical disk transport path is located between the upper base plate and the lower base plate; one end of the clearance is the optical disk insertion inlet, and the upper and the lower base plates are 80-90 millimeters wide at the optical disk insertion direction;

the guiding mechanism comprises a pair of detection bars that are symmetrically located at the two sides of the central line of the optical disk transport path and capable of rotating around respective rotary pivots, a linkage plate for making the pair of detection bars to move together, and a first stretching spring making the detection bars to rotate according to the direction that makes their detection parts to contact the periphery of the optical disk, wherein, the detection parts of the pair of detection bars are located between the plummer and the delivery roll of the transport mechanism;

the optical disk loading final position detection mechanism comprises a support part and a trigger bar; one end of the support part is rotatablely fixed to the upper base plate near the detection part of one detection bar, and its middle is provided with an assorted part interacting with the detection bar; the middle of the trigger bar is rotatablely fixed to the free end of the support part, of which one end is provided with a contact part for contacting the periphery of an optical disk, and the other end is connected to the control part.

For the shell of the optical disk player of the present invention is only 80-90 millimeters wide at the optical disk insertion direction, which is much less than the optical disk outer diameter of 120 millimeters, when an optical disk is at the playing position in the optical disk player of the present invention, a part of the optical disk will be exposed out of the shell of the optical disk player, so, when the optical disk is played, the status of the optical disk in the optical disk player can be intuitively seen from the outside.

For the support part and the trigger bar of the optical disk loading final position detection mechanism both adopt rotatable way to be connected, the displacement distance at the optical disk transport direction is effectively reduced, so as to reduce the width of the shell of the optical disk player at the optical disk insertion direction. At the same time, for the detection parts of the guiding mechanism are located between the plummer and the delivery roll, the width of the shell of the optical disk player at the optical disk insertion direction can be further reduced. So, it is ensured that the width of the shell of the optical disk player of the present invention can be made as 80-90 millimeters wide at the optical disk insertion direction.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Aspects of the present invention are best understood from the following detailed description when read with reference to the accompanying figures.

Referring to fromFIG. 1toFIG. 7, the optical disk player comprises: a shell1, a plummer12fixed in the shell, a transport mechanism for transporting the optical disk between the optical disk insertion inlet5and the plummer12, a guiding mechanism for guiding the optical disk to the center of the transport path, an optical disk loading final position detection mechanism, and a control part40; when an optical disk is transported to be above the plummer12, the control part40controls a chuck plate22to keep the optical disk on the plummer12, and controls the transport mechanism to cancel holding the optical disk.

The shell1is composed of an upper base plate2and a lower base plate3, and the upper, lower base plates are connected as one body via connecting components such as screws; a clearance4used as the optical disk transport path is located between the upper base plate2and the lower base plate3; one end of the clearance4is the optical disk insertion inlet5, and the shell at the other end is provided with a big diameter optical disk baffle6; the upper, lower base plate are 84 millimeters wide at the optical disk insertion direction; when an optical disk is at the playing position (that is, on the plummer12), a part of the optical disk is exposed out of the shell1, so, the status of the optical disk can be intuitively seen from the outside.

Referring toFIG. 1andFIG. 2, the guiding mechanism comprises a pair of detection bars10,11capable of rotating around respective rotary pivots10c,11c, which are symmetrically located at the two sides of the central line1aof the optical disk transport path, a linkage plate13for controlling the pair of detection bars10,11to move together, and a first stretching spring14making the detection bars10,11to rotate according to the direction that makes their detection parts10a,11ato contact the periphery of the optical disk.

Wherein, the two detection bars10,11are provided with long arms and short arms, which are of L shape; the front end of the long arms are provided with detection parts10a,11acontacting the periphery of the optical disk, and the front end of the short arms are provided with the first slotted holes10b,11b; the curved parts of the L shape are the rotary pivots10c,11c. The detection parts10a,11aof the pair of detection bars10,11are located between the plummer12and the delivery roll27of the transport mechanism; while being at the initial position, the space between the two detection parts10a,11ais a little smaller than the diameter of a small diameter optical disk. A salient foot part11dis located on the left detection bar11towards the lower base plate3. According to the rotating position, the foot part11dcan selectively mesh with the second salience40hand the third salience40gon the cam unit40(namely the control part40), so as to release the contact of the detection parts10a,11aand the periphery of the optical disk.

The linkage plate13capable of freely moving at the direction parallel to the optical disk transport path is fixed on the upper base plate2, and the two end parts of the linkage plate13are provided with the first saliencies13acapable of cooperating with the first slotted holes10b,11bof the two detection bars10,11. Moreover, a first guiding hole2aand a second guiding hole2bare located on the upper base plate2, so as to make the linkage plate13to move in parallel according to the optical disk transport path. Embedding parts13bcapable of being separately embedded to the two guiding holes2a,2bare located at the central part of the linkage plate13. Referring toFIG. 2, the width of an end part of the first guiding hole2ais a little bigger than the width of the embedding part13bon the linkage plate13, and step parts2care formed at the inner side of the first guiding hole2a. So, if the linkage plate13wants to do initial movement at heeling condition, the embedding parts13bwill contact the step parts2c, so as to limit the initial movement of the linkage plate13.

The first stretching spring14is located between the linkage plate13and the upper base plate2, stretching the linkage plate13to the downward direction inFIG. 1, so, the two detection bars10,11will endure the spring force of the first stretching spring14via the linkage plate13, to make the detection parts10a,11abeing in the trend of getting closer to each other.

Besides, the linkage plate13is provided with a first pushing part13c. When the movement of the linkage plate13is bigger than the initial position, as shown inFIG. 15, the first pushing part13cwill mesh with an optical disk baffle15that makes the transport of a small diameter optical disk to be at the stop position, so as to make the baffle part15aof the optical disk baffle15to exit from the optical disk transport path4. The optical disk baffle15is a long and thin clubbed part, which is fixed on the upper base plate2, and is perpendicular to the central line1a. Referring toFIG. 3, before the optical disk is inserted, the baffle part15aextends into the optical disk transport path4. The position of the baffle part15ais set to make it to contact the periphery of the small diameter optical disk when the center of the small diameter optical disk just passes the center of the plummer a little. Furthermore, a pushed part15bcontacting the first pushing part13cof the linkage plate13is located on the optical disk baffle15. Besides, the linkage plate13is also provided with a second pushing part13dand a third pushing part13e; when the linkage plate moves from the initial position, the second pushing part13dwill make a first switch16for starting the motor to act, and the third pushing part13ewill make a second switch17for judging the outer diameter of the inserted optical disk to act. The first switch16and the second switch17are fixed on the upper base plate2via a printed board18.

Referring toFIG. 1, the optical disk loading final position detection mechanism comprises a support part20and a trigger bar21; via a first short axis20a, one end of the support part20is fixed on the upper base plate2near the detection part11aof the left detection bar11to be capable of freely rotating; the middle of the support part20is provided with an assorted part20bto interact with a second slotted hole11eon the left detection bar11, and here the assorted part20badopts a salient point; the salient point is embedded in the second slotted hole11eand can move in the second slotted hole. While being at the initial state, the position where the support part20locates on the upper base plate2approximately coincides with the position where the detection bar11cooperating with the support part20locates on the upper base plate2. The middle of the trigger bar21is rotatablely fixed to a second short axis20cof the free end of the support part20; one end of the trigger bar is provided with a contact part21afor contacting the periphery of an optical disk, and the other end is provided with a contact pin21bcontacting the end face of the circular-arc groove40fof the cam unit40. Under the action of the spring force (the spring is not shown in the figure), the trigger bar21gives the second short axis20ca rotating force towards the center, to push the contact pin21btowards the end face of the circular-arc groove40fof the cam unit40.

The trigger bar21is a part of L shape, and its curved part is fixed to the second short axis20cof the free end of the support part20.

Referring toFIG. 1andFIG. 7, the transport mechanism comprises the delivery roll27and an optical disk guiding device7; the optical disk guiding device7is located at the optical disk insertion inlet5of the shell, and the delivery roll27is located at the position of the optical disk insertion inlet5to be opposite to the optical disk guiding device7; the roll support plate of the delivery roll27is fixed on the lower base plate3via a shaft28b; a second stretching spring29for making the roll support plate28to move towards the optical disk guiding device7is located between the roll support plate28and the lower base plate3. Under the action of the force of the second stretching spring29, the roll support plate28pushes the delivery roll27towards the optical disk guiding device7. If the optical disk is inserted along the middle of the delivery roll27and the optical disk guiding device7, the roll support plate28will rotate under the state of resist the second stretching spring29, so as to make the optical disk capable of entering from between the delivery roll27and the optical disk guiding device7. Moreover, the roll support plate28is provided with a third slide contact part28acapable of cooperating with a third flange40eof the cam unit40(namely the control part40) as shown inFIG. 8. If the cam unit40rotates from the initial position, the third flange40ewill make the delivery roll27to depart from the optical disk guiding device7for a vast scale. The structure of the delivery roll27is a bipyramidal structure with the diameter gradually increasing from the middle to the two ends. The shaft28bof the roll support plate28is located between the delivery roll27and the plummer12.

The lower base plate3is provided with a motor30, and a decelerating mechanism which decelerates the motor30and transports the power to the delivery roll27and the cam unit40. The decelerating mechanism comprises a belt pulley32decelerating and transporting the rotating of the motor via a belt31, a first gear33decelerating the belt pulley32and transporting its power, a second gear34decelerating the first gear33and transporting its power, a third gear35transporting the rotating via the second gear34, a worm gear36fixed to the plane of the lower base plate3and corresponding to the gear ring40aof the cam unit40, and a worm cooperating with the worm gear36; the periphery of the worm gear36is provided with a gear ring for cooperating with the gear ring40aof the cam unit40to drive the cam unit40to rotate, and the second gear34is fixed at one end of the worm. The motor30, the belt pulley32and the first gear33are fixed at the side of the lower base plate3; the second gear34and the third gear35are fixed at a gear plate37, and the gear plate37is fixed at the side of the lower base plate3. The gear ring40aof the cam unit40is provided with a gap40b; when the cam unit40is located at the initial position, the gap40bis opposite to the worm gear36. The third gear35meshes with a roll gear38; the roll gear38and the delivery roll27rotate as one body.

Referring toFIG. 8A,FIG. 8bandFIG. 1, the control part40is fixed to the lower base plate3, and it is a cam unit capable of rotating freely around its shaft; the cam unit is provided with:

a gear ring40alocated at an edge position of the periphery of the cam unit, the gear ring40abeing provided with a gap40b;

a first flange40clocated at the periphery of the cam unit, for controlling the chuck plate22to approach or be away from the optical disk transport path;

a second flange40dlocated at the periphery of the cam unit, for controlling the plummer12to approach or be away from the optical disk transport path;

a third flange40elocated at the periphery of the cam unit, for controlling the roll support plate28to rotate to make the delivery roll27to approach or be away from the optical disk guiding device7;

a circular-arc groove40flocated at the end part of the cam unit, for connecting the trigger bar21;

a second salience40hlocated at the periphery of the cam unit, for stirring the detection bar11to rotate to release the contact of the detection parts10a,11aand the periphery of a small diameter optical disk; and

a third salience40glocated at the periphery of the cam unit, for stirring the detection bar11to rotate to release the contact of the detection parts10a,11aand the periphery of a big diameter optical disk.

Wherein, the first flange40cextrudes out of the periphery of the cam unit40; the second flange40dand the third flange40esink into the peripheral surface. The second salience40hand the third salience40gare near the rotating end point of the cam; if a small diameter optical disk is inserted, when the rotary displacement of the foot part11dof the left detection bar11is comparatively small, the second salience40hwill contact the foot part11d; If a big diameter optical disk is inserted, when the left detection bar11is made to rotate for a vast scale, the third salience40gwill contact the foot part11d. For the second salience40hand the third salience40gcontacting and pressing the foot part11d, the left detection bar11will rotate counterclockwise to release the contact of the detection part11aand the periphery of the optical disk; at the same time, the rotating of the left detection bar11is transported to the right detection bar10via the linkage plate13, so as to release the contact of the detection part10aof the right detection bar10and the periphery of the optical disk.

Referring toFIG. 5, the upper base plate2is provided with a hold plate23to hold the chuck plate22. One end of the hold plate23is provided with the chuck plate22; the other end is provided with the first slide contact part23acooperating with the first flange40cof the cam unit40; the middle part is provided with a connecting part23b; the hold plate23is connected to the upper base plate2via the connecting part23b, and can freely rotate around the connecting part23b. Moreover, the end part of one side of the hold plate23is provided with a hold plate elastic trip24pushing the center of the chuck plate22towards the plummer12. A spring (the spring is not shown in the figure) is fixed between the hold plate23and the upper base plate2; the spring can make the hold plate23to rotate, so as to make the chuck plate22to endure the force of separating from the plummer12; If the cam unit40rotates from the initial position, the first flange40cwill endure the force of the spring to make the hold plate23to rotate, further to connect the chuck plate22and the plummer12by compression joint.

An optical disk signal pickup device and the plummer12integrally compose the rotating mechanism25for playing an optical disk, which is fixed to a PU base plate26via a shockproof elastic part25a; one end of the PU base plate26is fixed to the lower base plate3via a shaft26a, and the other end is provided with a second slide contact part26bfor cooperating with the second flange40dof the cam unit40. When the cam unit40is at the initial position, the second flange40dmakes the end of the PU base plate26to approach the lower base plate3, so as to make the plummer12to be far away from the optical disk transport path4(as shown inFIG. 5); and when the cam unit40is located at the rotating terminal end, the second flange40dcan make the plummer12to be in the optical disk transport path4(as shown inFIG. 6).

Description to the Actions:

FIG. 9shows the situation that the small diameter optical disk d resists the force of the second stretching spring29, to be inserted from between the optical disk guiding device7and the delivery roll27of the insertion inlet5. At this time, the periphery of the small diameter optical disk d pushes the detection parts10a,11aof the two detection bars10,11, so as to make the two detection bars to move from the position as shown with the imaginary line (broken line) to the position as shown with the real line. The rotating of the two detection bars10,11makes the linkage plate13to move from the position as shown with the imaginary line (broken line) to upwards. The moving of the linkage plate13makes the first switch16to be closed, so as to start the motor30. The motor30via the decelerating mechanism drives the delivery roll27to rotate, and the small diameter optical disk d is transported into the optical disk transport path4by the rotating of the delivery roll27. At this time, the gap40bof the cam unit and the worm gear36are located at corresponding positions, so, the rotating of the worm gear36will not make the cam unit40to rotate. Then, on the one hand, the small diameter optical disk d pushes the two detection bars10,11to rotate, on the other hand, it is guided in to the optical disk transport path.

If the small diameter optical disk is not aimed to the central position of the optical disk insertion inlet5while it is inserted, one of the two detection bars10,11will only rotate for a little, and the first switch16is closed, so, the small diameter optical disk d is transported into the optical disk transport path4by the rotating of the delivery roll27. After that, for the contact of the step parts2cand the embedding parts13b, the rotating of one side of the two detection bars10,11is limited. So, the small diameter optical disk d will be guided by the detection parts of the side with the rotating being limited, via the rotating of the delivery roll27, to be transported into the optical disk transport path4near the central line1a.

By the rotating of the left detection bar11, the second slotted hole11evia the assorted part20bmakes the support part20to rotate clockwise as shown in the figure. For the support part20is fixed according to the direction that makes the connecting line between the first short axis20aand the second short axis20cto be juxtaposed to the central line1a, the trigger bar21that is supported by the rotating front end of the support part20will move along the direction directly facing the central line1a. So, by the way of making the trigger bar21to move towards the direction directly facing the central line1a, in the present invention, the dimension of the shell of the optical disk player at the optical disk transport direction can be effectively controlled.

FIG. 10shows the situation that when the center of the small diameter optical disk d passes the center of the plummer12a little, the periphery of the small diameter optical disk d contacts the baffle part15a. At this time, the contact part21aof the trigger bar21is against the periphery of the small diameter optical disk d, and the contact pin21bof the trigger bar21moves from the position of the imaginary line to the position as shown with the real line near the center. By the rotating of the trigger bar21, the contact pin21bof the trigger bar21pushes the circular-arc groove40fof the cam unit40, so as to make the cam unit40to rotate counterclockwise. By the rotating of the cam unit40, the gear ring40aof the cam unit40meshes with the worm gear36. The motor30via the worm gear36makes the cam unit40to rotate counterclockwise. By the rotating of the cam unit40, the first flange40cwill via the hold plate23make the chuck plate22to approach the plummer12. Then, the hold plate elastic trip24fixed to the hold plate23via the chuck plate22pushes the small diameter optical disk d towards the plummer12.

On the other hand, the second flange40dof the cam unit40via the second slide contact part26bof the PU base plate26makes the PU base plate26to rotate around the shaft26a. With this rotating, the PU base plate26raises the rotating mechanism25, so as to make the plummer12to approach the small diameter optical disk dither plummer12and the chuck plate22together holds the small diameter optical disk, so as to make it possible to play the optical disk. On the surface of the plummer12opposite to the chuck plate22, a tapered salience12acooperating with the central hole of the small diameter optical disk d is provided; after the salience12ais embedded to the central hole of the small diameter optical disk d, the contact of the periphery of the small diameter optical disk and the baffle part15ais released.

Furthermore, referring toFIG. 7, by the rotating of the cam unit, the third flange40eof the cam unit40, under the situation of resisting the second stretching spring29, makes the roll support plate28to rotate counterclockwise around the shaft28b. By the roll support plate28rotating counterclockwise, the small diameter optical disk d and the delivery roll27together move towards the lower base plate3, and the small diameter optical disk d is descended to the plummer12. Then, by the roll support plate28rotating counterclockwise, the tapered delivery roll27departs from the small diameter optical disk d, to move to the position that will not hinder the rotating of the optical disk. On the other hand, since the small diameter optical disk descends to the plummer12, it also departs from the optical disk guiding device7.

Furthermore, when the cam unit40is at the counterclockwise rotating terminal end, the second salience40hof the cam unit40contacts the foot part11dof the left detection bar11, so as to make the left detection bar11to rotate counterclockwise as shown inFIG. 10. By this rotating, the left detection bar11makes the detection part11ato depart from the periphery of the small diameter optical disk. Besides, as shown inFIG. 10, via the linkage plate13, the right detection bar10that moves together with the left detection bar11rotates clockwise, so as to make the detection part10ato depart from the periphery of the small diameter optical disk. That is, after the small diameter optical disk d is inserted from the optical disk insertion inlet5, it is transported to the plummer12, and then it is held by the chuck plate22; in this period, the detection parts10a,11akeep guiding the periphery of the optical disk. By this guiding, no matter what posture the optical disk player of the present invention is at, it can all transport the small diameter optical disk d to the plummer12safely. Besides, in the operation of getting the optical disk out, the above mentioned actions will be executed conversely. So, only after the small diameter optical disk d is held by the two detection parts10a,11a, the holding of the chuck plate22and the plummer12to the optical disk is released; even if the direction of the optical disk insertion inlet5is downward, the small diameter optical disk can still be prevented from dropping out of the optical disk insertion inlet5.

FIG. 11shows that the small diameter optical disk d is kept on the plummer12to be at the state capable of being played. At this time, the cam unit40is located at the position of rotating terminal end; the detection parts10a,11aand the baffle part15aare at the state of not contacting the periphery of the small diameter optical disk d; the optical disk guiding device7and the delivery roll27are also at the state of not contacting the surface of the optical disk. By the action of the second salience40hof the cam unit40, the left detection bar11endures a rotating force towards counterclockwise direction, and the linkage plate13only moves slightly. For the slightly moving of the linkage plate13, the embedding parts13bvia the step parts2cmove towards the inner of the first guiding hole2a. So, while getting the optical disk out, the small diameter optical disk d is transported out under the holding of the delivery roll27and the optical disk guiding device7; for the embedding parts13bdon't contact the step parts2c, the action of getting out is very smooth.

FIG. 12shows the state that when the big diameter optical disk D is inserted from the insertion inlet, the rotary displacement of the two detection bars10,11gets to the maximum. By the rotating of the left detection bar11, the second slotted hole11evia the assorted part20bmakes the support part20to rotate clockwise as shown in the figure to the utmost. The trigger bar21fixed to the rotating front end of the support bar20moves towards the direction directly facing the central line1afor the maximum range. So, for the trigger bar21moves towards the direction directly facing the central line1a, even if the rotating of the left detection bar11gets to the utmost, the increasing of the dimension of the main unit at the optical disk transport direction can still be restrained. During the course of the rotating of the two detection bars10,11getting to the maximum range, the first pushing part13cof the linkage plate13pushes the pushed part15bof the optical disk baffle15, as shown inFIG. 15, so as to make the baffle part15aof the optical disk baffle15to exit from the optical disk transport path4. So, the big diameter optical disk can be transported under the situation of not contacting the baffle part15aof the optical disk baffle15.

FIG. 13shows the state that the big diameter optical disk D contacts the baffle6to stop the transport action; the center of the big diameter optical disk is located at the position just passing the center of the plummer a little; at this time, the contact part21aof the trigger bar21is pushed towards the periphery of the big diameter optical disk D, and the trigger bar21will rotate around the second short axis20cfrom the position of the imaginary line (broken line) to the position of the real line. By the rotating of the trigger bar21, the contact pin21bof the trigger bar21pushes the end face of the circular-arc groove40fof the cam unit40, so as to make the cam unit40to rotate counterclockwise. By the rotating of the cam unit40, the gear ring40aof the cam unit40meshes with the worm gear36, so as to make the rotating of the motor30to be transported to the cam unit40.

When the cam unit40is at the counterclockwise rotating terminal end, the third salience40gcontacts the foot part11dof the left detection bar11, so as to make the left detection bar11to rotate counterclockwise as shown inFIG. 14. By this rotating, the detection part11aof the left detection bar11departs from the periphery of the big diameter optical disk Dothan, the optical disk D is kept on the plummer12by the chuck plate22. For the big diameter optical disk D makes the two detection bars10,11to rotate for a vast scale, the movement amount of the linkage plate13is also increased; the result is that the third pushing part13emakes the second switch17to act to be at the connected state. After the second switch17is at the connected state, a signal will be sent out to show that the optical disk inserted is a big diameter optical disk.

FIG. 14shows that the big diameter optical disk D is located on the plummer12to be at the state capable of being played. At this time, the cam unit40is located at the position of the rotating terminal end; the two detection bars10,11and the baffle6are at the state of not contacting the periphery of the big diameter optical disk D; besides, the optical disk guiding device7and the delivery roll27are also at the state of not contacting the surface of the optical disk, so the optical disk is possible to be played.

The present invention can be applied to optical disk players, such as of CD, DVD. The upper and the lower base plates can be made as 80-90 millimeters wide at the optical disk insertion direction.