JP2002269883A - Disk medium checking device for reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a CD reproducing device which prevent the CD of a type different from a normal type from being fetched and stuck or the like. SOLUTION: On the insertion opening part 2 of the CD reproducing device 1, rollers R supported by locking members 7 and 8 are projected from oblong holes 5 and 6 and provided. They are abutted to the front part side edge of an inserted CD and spread against springs 10a and 10b. Teethed members 7c and 8c are extended from the locking members 7 and 8 and a first gear 14 engaged with the teeth 12 and 13 is rotated corresponding to the interval of the rollers. When the rotation of the first gear 14 detected by a first sensor 16 before the CD is inserted for a prescribed amount is reverse, it is judged that the CD is not the normal type of a complete round or is the one of small diameter though it is the complete round, an insertion blocking mechanism 27 is operated and the insertion of the different type CD is blocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk medium checking device in a reproducing device for reproducing a disk medium such as a compact disk (CD).

[0002]

2. Description of the Related Art A CD reproducing apparatus moves a CD after detecting the start of insertion of the CD and moving the CD until an engaging hole formed in the center of the CD comes to a position corresponding to a position on a spindle of a spindle motor. The rotation center axis is positioned by fitting the engagement hole with the
Is driven to rotate. The presence or absence of pits (or bumps) of the CD rotated in this way is read by an optical pickup, subjected to amplification, modulation, code error correction, etc., then D / A converted, amplified, and reproduced. You. Means for moving the CD to the spindle position include the type in which the tray on which the CD is loaded is detected and the tray is pulled in, and the type in which the tray is not attached and the CD is directly inserted from the insertion opening is detected. There is a type that pulls in a CD.

On the other hand, a CD includes a 12 cm CD, an 8 cm C
D and some have different diameters. Therefore, in the type using the above tray, a tray for 12cmCD and 8c
Since each positioning recess for mCD is formed concentrically, if the tray is pulled in and moved by the same predetermined distance regardless of the diameter of the CD after the CD is placed on the tray, the positions of the engagement hole and the spindle match. I will be. On the other hand, in the direct insertion type that does not use a tray, the insertion of the CD is detected and the CD is pulled in. Therefore, the moving distance from the insertion detection position to the spindle position differs depending on the diameter of the CD. So, what diameter CD
A plurality of sensors are provided in order to detect whether or not the CD is moved. The moving distance is selected according to the type of the CD detected by these sensors, and the CD is moved.

[0004]

The latter method using no tray, compared with the former method using a tray, requires less space for the tray and can be made compact, and there is a possibility that the tray may be damaged by hitting a CD during running. Because of the lack of such a device, it is frequently used in a CD reproducing device for use in a vehicle or the like. However, in the case of a type of CD reproducing apparatus having no tray, using a sensor,
However, among the CDs, there are various shapes of CDs such as a square, an oval, and a star as well as a different diameter. As a result, the CD may be stuck inside in an attempt to select an improper moving distance and move the CD by erroneously determining the effective size of the CD.

Accordingly, the present invention is directed to a CD reproducing apparatus of a type that detects that a CD has been inserted directly from an insertion opening and pulls the CD in, when a CD having a shape different from a predetermined shape is inserted, It is an object of the present invention to provide a disk medium check device that does not pull in a CD but inserts and reproduces a regular type CD when a normal type CD is inserted.

[0006]

According to the present invention, there is provided an insertion opening for directly inserting a disk medium, and loading the disk medium inserted into the insertion opening to a predetermined amount to a driving position. And a biasing means for biasing the insertion opening so as to reduce the distance between the engagement bodies, the biasing means being provided in the insertion opening so as to be movable in the width direction. In accordance with the entry of the disk medium inserted into the insertion opening from between the engagement bodies, the engagement bodies abut each other on the outer peripheral edge of the disk medium to change the interval between them, and the outer peripheral edge of the disk medium is changed. According to the shape, insertion of the disc medium beyond a predetermined level is prevented.

Before inserting the disk medium into the insertion opening,
The engaging bodies are urged to each other to reduce the distance between them. When the insertion of the disk medium is started, the engagement body that has come into contact with the leading end of the disk medium changes the interval while abutting and following both side edges of the disk medium. Here, if the inserted disk medium is, for example, a perfect circle in which reproduction is allowed, the engaging body gradually opens the interval until the diameter of the disk medium becomes large, and the inside of the disk medium reproducing apparatus is opened. Allow entry into However, if the disk medium has a deformed shape that does not allow reproduction, for example, a shape having a protruding portion, even if the engagement body is initially expanded,
The protrusion and the engaging body are locked to each other during the insertion, so that further entry is prevented.

According to a second aspect of the present invention, there is provided a reproducing apparatus having an insertion opening for directly inserting a disk medium, and a loading mechanism for pulling a disk medium inserted to a predetermined amount into the insertion opening to a driving position. Urging means for providing two engaging bodies movably in the width direction in the portion, and urging the space between the engaging bodies so as to reduce the distance between the engaging bodies; and interval detecting means for detecting a physical quantity corresponding to the distance between the engaging bodies. , 2
In response to the entry of the disk medium inserted into the insertion opening from between the engagement bodies, the change in the interval between the engagement bodies abuts on the outer peripheral edge of the disk medium, respectively,
It has a shape discriminating means for discriminating the shape of the disk medium, and a pull-in preventing means for preventing the disk medium from being pulled into the drive position when the disk medium is not a regular shape.

While the engaging member changes the interval in accordance with the degree of insertion of the disk medium, the shape discriminating means determines the outer peripheral edge of the disk medium to have an irregular shape based on the change in the interval detected by the interval detecting means. It is determined whether or not the disk drive is normal, but if the disk is abnormal, the pull-in prevention means prevents the disk medium from entering further by blocking the disk medium.

According to a third aspect of the present invention, there is provided a reproducing apparatus comprising: an insertion opening for directly inserting a disk medium; and a loading mechanism for drawing a disk medium inserted to a predetermined amount into the insertion opening to a driving position. A pair of rotatable engaging members are provided in the portion so as to be movable in the width direction, and a biasing means for biasing the space between the engaging members so as to reduce the distance therebetween, and a physical quantity corresponding to the distance between the engaging members is detected. An interval detecting means, a rotation amount detecting means for detecting a rotation amount of the engagement body, and the engagement body is moved to the outer peripheral edge of the disk medium in response to the entry of the disk medium inserted into the insertion opening from between the two engagement bodies. Shape discriminating means for discriminating the shape of the disk medium from the amount of rotation and the spacing between each following contact, and the drive of the disk medium when the shape of the disk medium is not a regular type. It was assumed to have a retraction prevention means for preventing retraction into position.

The shape discriminating means discriminates the shape of the outer peripheral edge of the disk medium from the distance between the engaging members obtained by the distance detecting means and the rotation amount of the engaging member obtained by the rotation amount detecting means. However, in the case of an irregular shape, the pull-in prevention means prevents the disk medium from being pulled in.

[0012] In particular, the invention according to claim 4 is characterized in that the shape discriminating means sets the regular shape of the outer peripheral edge of a perfect circle at a predetermined size, and when the disk medium is not a perfect circle but smaller than the predetermined size.
The disc medium is determined to be odd.

According to a fifth aspect of the present invention, the distance detecting means moves in conjunction with the engaging member and has a tooth, and the moving member is interposed between the moving members and meshes with both teeth to increase the distance between the engaging members. The gear has a gear whose rotation direction is opposite to the direction in which the gear is narrowed, and a first sensor that detects the amount of rotation of the gear. The moving member also moves with the movement of the engaging body, and as a result, the gear meshing between the teeth of both moving members also rotates. The rotation amount of the gear detected by the first sensor corresponds to the distance between the engagement bodies. Further, for example, when the disk medium has a perfect circular shape, the fact that only the interval between the engagement bodies increases while the disk medium is inserted to the substantially diametrical position is indicated by the rotation of the gear in one direction.

According to a sixth aspect of the present invention, each of the engagement members is supported by a slide portion movable along the guide portion, and at least one of the slide portions is provided on the guide portion when the distance between the engagement members becomes a predetermined distance or more. , A loading switch that operates when contacted and drives the loading mechanism is provided. According to a seventh aspect of the present invention, the engaging body is a roller whose surface is made of a friction material.

[0015]

According to a first aspect of the present invention, there is provided a disk inserted into an insertion opening, the two engagement members being provided in such a manner as to be movable in the width direction and to be urged so as to reduce the interval therebetween. In accordance with the entry of the medium, the engagement body is assumed to abut against the outer peripheral edge of the disk medium, respectively. When the engagement bodies are locked with each other, further entry is prevented. With this, it is possible to prevent a problem that the odd-shaped disk medium is accidentally pulled in and the stack is stuck inside the reproducing apparatus with a cheap and simple configuration.

According to a second aspect of the present invention, there is provided an interval for detecting a physical quantity corresponding to an interval between two engagement members provided so as to be movable in a width direction of the insertion opening and to be biased so as to reduce the interval between them. Detecting means, wherein the shape discriminating means discriminates whether or not the shape of the outer peripheral edge of the disk medium is irregular based on a change in the distance between the engaging bodies, and when the irregular shape is detected, the retracting preventing means prevents the disk medium from being retracted. Therefore, it is possible to prevent a disk medium of a different shape other than a shape having a projection from being drawn into the reproducing apparatus.

According to a third aspect of the present invention, there is provided an interval for detecting a physical quantity corresponding to an interval between two engagement members provided so as to be movable in a width direction of the insertion opening and to be biased so as to reduce the interval between them. In addition to the detection means, a rotation amount detection means for detecting the rotation amount of the engagement body is provided, and the shape determination means determines whether or not the shape of the outer peripheral edge of the disk medium is irregular based on the rotation amount and an interval therebetween. Since the pull-in preventing means prevents the disk medium from being pulled in when the disk is irregular, it is also possible to identify a deformed shape which cannot be determined only by a change in the distance between the engaging members, thereby reliably preventing the disk medium from being drawn in more widely.

According to a fourth aspect of the present invention, a disk medium whose outer peripheral edge has a perfect circle shape is determined to be normal, and if the disk medium is not a perfect circle or smaller than a predetermined size, it is determined to be an irregular shape. Is reliably prevented from being pulled in.

According to a fifth aspect of the present invention, in particular, the distance detecting means is moved in conjunction with each of the engaging members and has a moving member provided with teeth, and the moving member is interposed between the moving members and meshes with both teeth to reduce the distance between the engaging members. Since the rotation direction is reversed between the expanding direction and the narrowing direction and the first sensor that detects the rotation amount of the gear, the distance between the engagement bodies can be obtained by the rotation amount of the gear, If the rotation direction of the gear is reversed before the predetermined amount is inserted, it can be easily determined that at least the disk medium is not a perfect circle.

According to a sixth aspect of the present invention, a loading switch is provided in the guide portion of the slide portion, the load switch being operated when the slide portion supporting the engagement member comes into contact when the distance between the engagement members becomes a predetermined value or more. Therefore, if the disc medium is not locked by the engaging body or the operation of the loading mechanism is not prohibited by the control means until the interval between the engaging bodies becomes, for example, substantially equal to the diameter of the regular disc medium, Since the loading mechanism operates, the drawing of the odd-shaped disk medium is reliably prevented.

According to the seventh aspect of the present invention, since the roller having the surface made of a friction material is used as the engaging body, the roller abuts on the outer peripheral edge of the disk medium and rotates to smoothly rotate during the insertion of the disk medium. Follow.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples. FIG. 1 is a perspective view showing the front part of the CD reproducing apparatus according to the first embodiment, and FIG. 2 is a sectional view showing the internal structure. The CD reproducing device 1 has a loading mechanism for pulling in the CD3 and moving it to the spindle position,
A spindle motor for rotating the disk, an optical pickup for reading the presence or absence of a rotating CD3 pit, an eject mechanism,
An electronic circuit and the like are built in. Since these internal mechanisms are well known, description thereof will be omitted here.

At the front of the CD reproducing device 1, an insertion opening 2 for inserting a CD 3 is provided. Two elongated holes 5 and 6 are formed in the floor portion 4 extending from the insertion opening 2 to the inside along the width direction of the insertion opening 2. Rollers R, R rotatably supported by the pins 7a, 8a of the locking members 7, 8 protrude vertically from the elongated holes 5, 6 across the insertion opening 2. Each roller R has a frictional rubber surface. The lower portions of the locking members 7 and 8 are bent at right angles to form sliding portions 7b and 8b, and are inserted into the guide grooves 9 so as to be slidable in the width direction. Guide groove 9 for guiding slide portion 7b of locking member 7
Is provided with a loading switch 11 at the terminal end.

A spring 1 is provided between the locking members 7 and 8.
0 to form urging means, and the pin portions 7a, 8a
, That is, between the rollers R, R. FIG. 3 shows a cross section taken along the line AA in FIG.
The slide portions 7b, 8b are formed wider than the pin portions 7a, 8a so as not to fall out of the guide grooves 9 upward. In addition, CD3 is a perfect circle size of 12 cm,
It is a regular type that can be reproduced by the CD reproducing apparatus 1.

In the CD reproducing apparatus of the present embodiment configured as described above, when the CD 3 is inserted, first, the front side edge of the CD 3 comes into contact with the rollers R, R. When the CD 3 is further advanced, the component force in the width direction acts on the rollers R, R, and the rollers are moved in a direction away from each other. That is, the CD 3 is pushed by hand and moves forward while expanding the interval between the rollers R, R against the pulling force of the spring 10. At the time of this forward movement, since the CD3 has a predetermined shape and is a perfect circle, the rollers R, R abut against the side edges of the CD3 and are rotated, and the widthwise movement of the rollers R, R is also locked to the CD3. The slide portion 7b, 8b moves in the guide groove 9 without being performed, so that smooth insertion is ensured.

When the CD 3 is inserted approximately halfway, and the center portion comes close to the line connecting the elongated holes 5 and 6 as shown in FIG. 4, the distance between the rollers R becomes close to the maximum (= diameter). The end of the slide 7b pushes the loading switch 11 on. As a result, a loading mechanism (not shown) operates to draw the CD 3 into the inside and move the CD 3 to a spindle position (not shown). The insertion opening 2
An insertion amount sensor (not shown) such as a photo sensor is installed in the back of the box to detect that a predetermined amount close to approximately half of the regular CD3 has been inserted.
Is set so that the loading mechanism does not operate even when the loading switch 11 is turned on in a state where the predetermined amount or more is not inserted.

The CD3 transported to the spindle position is:
The signal is read by an optical pickup and is reproduced by an electronic circuit. After the CD3 advances and the central portion passes between the rollers R and R, the distance between the rollers R and R is reduced by the spring 10, and finally the rollers R and R hit the inner ends of the elongated holes 5 and 6 and become the narrowest position. Is locked.

On the other hand, for example, hexagram (H
In the case of inserting a CD 30 having an exagram) shape, at the beginning of the insertion, the rollers R, R abut on the CD 30 and move in the width direction while being pushed and spread in the same manner as in the case of the above 12 cm CD. The side surface of the projected portion comes to a position where it contacts the rollers R, R. In this position, as shown in FIG. 5 (a), the rollers R, R are pushed in a direction substantially perpendicular to the sliding slots 5, 6, and further insertion is impossible. From the atypical CD3
A zero is not pushed to the point where it is retracted. Crosshair shown in (b)
And a star-shaped variant CD3 shown in (c)
The same applies to 1 and 32.

In the case of a small-diameter CD, FIG.
As shown in the above, even if the rollers R, R are pushed out by the CD 33, the end of the slide portion 7b does not reach the point where the loading switch 11 is pressed, so that the loading mechanism does not operate and it is not similarly retracted. . FIG. 6B shows a can (Can) shape and FIG. 6C shows an egg (Eg).
The same applies to the variant CDs 34 and 35 of the g) type. As described above, in the CD reproducing apparatus according to the first embodiment, it is possible to prevent a defect such as drawing in and stacking a different-shaped CD with a simple and inexpensive structure.

Next, a second embodiment of the present invention will be described. FIG. 7 is a sectional view of a second embodiment corresponding to FIG. 2 in the previous embodiment. As in the first embodiment, the slot 5,
The rollers R, R supported by the pin portions 7a, 8a of the locking members 17, 18 are projected from 6, and can be brought into contact with the front side edge of the CD to be inserted. The locking member 17 further extends in the width direction of the insertion opening 2 and is movable in the guide groove 19. The sliding member 7 b extends downward from the sliding portion 7 b, bends, and extends toward the locking member 18 to extend the end portion. A toothed member (moving member) 7c having teeth 12 is provided.

The locking member 18 is provided with a toothed member (moving member) 8c extending along the width direction at a position above the toothed member 7c and having teeth 13. The toothed member 8c is slid. It is also slidable in the guide groove 19. On the other hand, between the toothed members 7c and 8c, the first
A gear 14 is arranged and meshes with both the teeth 12 of the toothed member 7c and the teeth 13 of the toothed member 8c.

The first gear 14 is provided with a first sensor 16 capable of detecting the direction of rotation. First sensor 16
Is output to the control circuit 40, and the control circuit 40 controls an insertion block mechanism 27 described later based on the detection result of the first sensor 16. The above-described toothed members 7c, 8c, the first gear 14, and the first sensor 16
Constitutes the interval detecting means. Further, the first gear 14 is connected to a first motor 22. First gear 14
Usually rotates according to the relative displacement of the toothed members 7c and 8c, but when the first motor 22 is driven, the toothed members 7c and 8c are displaced and moved in reverse.

The insertion block mechanism 27 is, for example, as shown in FIG.
As shown by a broken line, a block pin 28 is provided at the center of the CD insertion passage so as to be able to protrude therefrom, and protrudes from the retracted position according to an operation command to abut on the front edge of the CD to prevent entry.
The position of the block pin 28 from the insertion opening 2 is set closer to the insertion opening 2 than the insertion amount sensor described above.

A spring support 15 is provided at an intermediate position between the locking members 17 and 18, and a spring 10 is provided between each of the locking members 17 and 18 and the spring support 15.
a and 10b are provided to urge the pin portions 7a and 8a to be narrowed. The guide groove 19 has a locking member 17.
A loading switch 11 is provided at the end of the portion for guiding the slide portion 7b. Other configurations are the same as those of the first embodiment.

As described above, in this embodiment, since the rollers R, R can be moved only along the elongated holes 5, 6 as in the previous embodiment, the irregular shape which can prevent insertion / retraction in the previous embodiment. CDs can be similarly blocked, including small diameter CDs. Further, by the control described below, it is possible to prevent pulling in of a different shaped CD having another different shape.

FIG. 8 is a flowchart showing the flow of the check control by the control circuit 40 in the CD reproducing apparatus of the present embodiment. In step 101, the control circuit 40
Reads the detection output of the first sensor 16 and
Monitor the rotation status of. In step 102, it is checked whether the first gear 14 has rotated in the reverse direction. If the first gear 14 is not rotating in the reverse direction, the process proceeds to step 103,
Check whether the loading switch 11 is turned on.

Until the loading switch 11 is turned on, the process returns to step 101 and the above steps are repeated. That is, when a regular 12 cm CD3 of a perfect circle is inserted, the front side surface of the CD3 comes into contact with the rollers R, and pushes them out. Accordingly, the toothed member 7c of the locking member 17 moves leftward in FIG. 7, and the toothed member 8c of the locking member 8 moves rightward in FIG. As a result, the first gear 14 is rotated clockwise in the figure by the teeth 12 and 13,
The first sensor 16 detects this rotation direction. When the diameter of the CD 3 is less than half the diameter, the first gear 14 continues to rotate clockwise and does not rotate backward. During this time, CD3 being inserted is allowed to continue insertion.

At the time when CD3 has been inserted to nearly half,
The slide portion 7b contacts the loading switch 11. As a result, the loading switch 11 is turned on. That is, if the loading switch 11 is turned on in the check of step 103, the process proceeds to step 104. In step 104, the loading mechanism operates to draw the CD3 and move it to the spindle position. When it is confirmed in step 105 that the movement of the CD 3 to the spindle position has been completed and the insertion of the CD has been completed, this flow is completed.

On the other hand, before the loading switch 11 is turned on, if the first gear 14 is rotated in the reverse direction in the check in the previous step 102, it is determined that the first gear 14 is an odd-shaped CD, and the routine proceeds to step 106, where the insertion block mechanism 27 is operated. ,
The block pin 28 is projected into the insertion path of the CD. As a result, the front edge of the CD contacts the block pin 28, and further insertion is prevented. Thereafter, in step 107, the first motor 22 is driven to rotate forward for a certain period of time to widen the interval between the rollers R, R, and the blocked CD can be taken out, thus ending the flow.

For example, in the case of a small-diameter irregular CD, the gap between the rollers R, R is expanded until half of the diameter of the first gear 14 is inserted. Is reversed. So originally loading
Since the switch 11 is not turned on, it is not retracted to the spindle position, but the block pin 28 positively prevents further insertion.

In this embodiment, further, in the case of an arrow-shaped variant CD 36 as shown in FIG.
At first, the interval between the rollers R, R is widened as shown by the imaginary line with the insertion, and the first gear 14 is rotated clockwise. However, immediately after the trailing edge of the arrow passes through the rollers R, R, the roller R , R, the first gear 14 rotates in the reverse direction correspondingly. When the reverse rotation of the first gear 14 is detected in the above-described step 102, it is determined that the CD is odd-shaped, and the insertion block mechanism 27 operates to project the block pin 28. This prevents further insertion of the variant CD.

The distance between the trailing edges of the arrows is a regular CD.
3, when the rollers R, R get over the trailing edge, the sliding portion 7b is set to the loading switch 1 position.
1 may be turned on, but if the insertion amount sensor has not yet detected insertion of a predetermined amount or more,
The loading mechanism does not operate. FIG. 9B
Sprocket type variant CD shown in
Similarly, since the distance between the rollers R, R is reduced, the insertion of the insertion block mechanism 27 is prevented. In this embodiment, the steps 101 and 102 constitute the shape discriminating means of the present invention, and the step 106 constitutes the pull-in preventing means.

As described above, in the CD reproducing apparatus according to the present embodiment, if the protrusions have a gentle shape and are forcibly pushed in, the rollers R, R may be pushed open to insert the odd-shaped C.
Even in the case of D, since the mode of movement of the rollers R, R in the width direction is determined via the first gear 14, the number of irregular shapes that can be prevented from being pulled in can be increased.

Next, a third embodiment of the present invention will be described. This is provided with a sensor for detecting the amount of rotation of the roller R in addition to the configuration of the second embodiment.
FIG. 10 is a sectional view of a third embodiment corresponding to FIG.
That is, the roller R supported by the locking member 17 includes a roller gear 24 that rotates integrally, and the slide portion 7b is provided with a detection drive gear 25 that meshes with the roller gear 24. The detection drive gear 25 is provided with a second sensor 20 for detecting its rotation.
It is connected to a motor 23 and can be driven to rotate.

The rotation of the first gear 14 indicates the distance between the rollers R. The second sensor 20 detects the number of rotations of the roller R rotating in contact with the side edge of the CD via the roller gear 24 meshing with the detection drive gear 25. The second motor 23, the roller gear 24, the detection drive gear 2
The fifth sensor 20 and the second sensor 20 are also attached to the roller R on the locking member 18 side, but are not shown for simplicity. The above-described roller gear 24, detection drive gear 25, and second sensor 2
0 forms a rotation amount detecting means. Other configurations are the same as those of the second embodiment.

FIG. 11 is a flowchart showing the flow of the check control by the control circuit 40 'in the CD reproducing apparatus of the present embodiment. In step 201, the control circuit 40 'reads each detection output of the first sensor 16 and the second sensor 20, and monitors the rotation state of the first gear 14 and the detection drive gear 25.

In the following step 202, the first sensor 16
Then, based on the detection output of the second sensor 20, a parameter for determining whether or not the outer peripheral shape of the inserted CD is a perfect circle is compared. That is, as shown in FIG. 12, when the radius of a perfect circle CD is r, the rollers R, R when the CD is inserted and the interval between the rollers R, R are expanded.
Has the following relationship between the interval W and the arc length t of the outer peripheral edge. W + W1 = r · sin (t / r + t1 / r) where W1 is the initial value of the roller interval, t1 is the roller R,
This is the initial value of the arc length when the CD is brought into contact with R. The arc length t is determined from the diameter of the roller R and the number of rotations thereof.
In this step, for each of the right and left rollers R, R, the right side and the left side of the above equation are obtained and compared.

In step 203, it is checked whether the inserted CD is a perfect circle by comparing the above parameters. If it is a perfect circle, the process proceeds to step 204 to check whether the loading switch 11 has been turned on. Until the loading switch 11 is turned on, the process returns to step 201 and the above steps are repeated to continue checking whether the CD is a perfect circle.

In the case of a perfect circular CD, the slide portion 7b comes into contact with the loading switch 11 at the time when the CD is inserted to approximately half the vicinity. As a result, the loading switch 11 is turned on. That is, when the loading switch 11 is turned on in the check of step 204,
Proceed to step 205. In step 205, the loading mechanism operates to draw the CD and move it to the spindle position. Then, in step 206, when it is confirmed that the movement of the CD to the spindle position has been completed and the insertion of the CD has been completed, this flow ends.

On the other hand, before the loading switch 11 is turned on, if the CD in the previous step 203 is not a perfect circle, it is determined that the CD is an odd-shaped CD and the step 207 is performed.
Then, the insertion block mechanism 27 is operated to cause the block pin 28 to protrude into the CD insertion passage. This allows
The CD has its leading edge abutting on the block pin 28 to prevent further insertion. Then, in step 208, the first motor 22 is driven for a predetermined time, and the rollers R, R
Are extended, and the blocked CD can be taken out. At this time, by driving the second motor 23 as well,
The rollers R, R are rotated in a direction opposite to the direction of rotation when the CD is inserted, thereby facilitating the ejection of the CD. Thereafter, the flow ends.

The present embodiment is configured as described above, and the shape of the CD is detected by both the rotation of the rollers R, R and the distance between the rollers. All of the atypical CDs can be discriminated and discriminated from the perfect circular regular CD3.

Further, a triangle shape shown in FIG. 13A and a square shape (Sq) shown in FIG.
In the case of the urea) type CDs 38 and 39, when inserted from a sharp point, the interval between the rollers R and R is increased until the center of the CD is inserted. Then, it is determined whether or not the circle is a perfect circle based on the rotation of the rollers R and the interval between the rollers. Therefore, it is possible to reliably prevent the entry of these variant CDs.
There is no case where the loading switch 11 is pressed to operate the loading mechanism. In this embodiment, the above steps 201 to 203 constitute the shape discriminating means of the invention,
Step 207 constitutes the pull-in prevention means.

In this embodiment, both rollers R, R are provided with a roller gear 24 and a detection drive gear 25, and the rotation of the rollers R, R is detected by the second sensor 20 via these. In order to determine whether or not the outer peripheral shape of the CD is a perfect circle, the second sensor 20 can be provided only in one of them. However, by rotating both rollers R, R by the second motor 23, the ejection of the odd-shaped CD becomes easy.

In the first and second embodiments, the pull-in preventing means is provided in step 106 or step 207.
Activate the insertion block mechanism 27 with the
8 to prevent further insertion of the CD,
Although it is assumed that the CD is prevented from being pulled in, instead of using the insertion block mechanism 27 as the pull-in preventing means, when the CD is determined to be an abnormal type, the loading mechanism is disabled and the loading switch 11 is pushed. Alternatively, the loading mechanism may be configured not to operate to prevent the CD from being pulled in.

Further, the interval between the rollers R, R is detected by detecting the rotation of the gear 14 with the first sensor 16, but is not limited to this, and corresponds to the interval between the rollers R, R. The physical quantity may be obtained, for example, by directly detecting the movement amount of the rollers R, R. Also,
In the embodiment, the gap between the upper ends of the rollers R, R and the ceiling of the insertion opening 2 is reduced so that there is no possibility that a CD is accidentally inserted into the gap.
A hole or recess is provided in the ceiling corresponding to
If the upper end of R is extended above the general surface of the ceiling, the above-mentioned fear is completely eliminated. Further, in the embodiment, a CD has been described as an example of a disk medium.
D and other various types of disk media playback devices.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a front part of a CD reproducing apparatus according to a first embodiment.

FIG. 2 is a sectional view showing the internal structure of the first embodiment.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is an explanatory diagram showing an operation when a regular CD is inserted.

FIG. 5 is an explanatory diagram showing an operation at the time of inserting an abnormal CD.

FIG. 6 is an explanatory view showing an operation at the time of inserting another irregular CD.

FIG. 7 is a sectional view showing the configuration of the second embodiment.

FIG. 8 is a flowchart illustrating a flow of a check control according to the second embodiment.

FIG. 9 is an explanatory diagram showing an operation at the time of inserting an abnormal CD.

FIG. 10 is a sectional view showing a configuration of a third embodiment.

FIG. 11 is a flowchart illustrating a flow of a check control according to the third embodiment.

FIG. 12 is an explanatory diagram showing a point of the true circular shape determination.

FIG. 13 is a diagram showing another example of a variant CD.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 CD reproduction apparatus 2 Insertion opening 3 CD4 Floor part 5, 6 Slotted hole 7, 8, 17, 18 Locking member 7a, 8a Pin part 7b, 8b Sliding part 7c, 8c Toothed member (moving member) 9, 19 Guide groove 10, 10a, 10b Spring 11 Loading switch 12, 13 Teeth 14 First gear 15 Spring support 16 First sensor 20 Second sensor 22 First motor 23 Second motor 24 Roller gear 25 Detection drive gear 27 Insert Block mechanism 28 Block pin 30, 31, 32, 33, 34, 35, 36, 37, 3
8, 39 CD 40, 40 'Control circuit R roller

Claims (7)

[Claims] 1. A reproducing apparatus comprising: an insertion opening for directly inserting a disk medium; and a loading mechanism for pulling a disk medium inserted to a predetermined amount into the insertion opening to a driving position. Is provided so as to be movable in the width direction, and has an urging means for urging so as to reduce the interval between the engaging bodies, and is inserted into the insertion opening from between the two engaging bodies. In accordance with the approach of the disk medium, the engagement body abuts and follows the outer edge of the disk medium to change the interval between them, and according to the shape of the outer edge of the disk medium, the predetermined distance of the disk medium exceeds a predetermined value. A disc medium checking device for a reproducing apparatus, wherein insertion of a disc is prevented. 2. A reproducing apparatus comprising: an insertion opening for directly inserting a disk medium; and a loading mechanism for pulling a disk medium inserted to a predetermined amount into the insertion opening to a driving position. An urging means for movably providing the engaging body in the width direction and urging the space between the engaging bodies so as to reduce the distance between the engaging bodies; an interval detecting means for detecting a physical quantity corresponding to the distance between the engaging bodies; 2
In accordance with the entry of the disk medium inserted into the insertion opening from between the engagement bodies, the change in the distance between the engagement bodies caused by the engagement bodies following the outer peripheral edges of the disk medium, respectively, A disc medium checking device for a reproducing apparatus, comprising: a shape discriminating means for discriminating a shape; and a pull-in preventing means for preventing a disc medium from being drawn into a driving position when the disc medium is not a regular shape. 3. A reproducing apparatus comprising: an insertion opening for directly inserting a disk medium; and a loading mechanism for pulling a disk medium inserted to a predetermined amount into the insertion opening to a driving position. Urging means for arranging two possible engaging members so as to be movable in the width direction and for urging the distance between the engaging members so as to decrease the distance between the engaging members; and a distance detecting means for detecting a physical quantity corresponding to the distance between the engaging members. Means, a rotation amount detecting means for detecting a rotation amount of the engagement body, and the engagement body being outside the disk medium in response to the entry of the disk medium inserted into the insertion opening from between the two engagement bodies. Shape discriminating means for discriminating the shape of the disk medium from the amount of rotation caused by following the peripheral edge and the distance between them, and the disc when the shape of the disk medium is not a regular type. A disc medium checking device for a reproducing apparatus, comprising: a pull-in preventing means for preventing a pull-in of a recording medium to a driving position. 4. The shape discriminating means makes the outer peripheral edge shape of a perfect circle of a predetermined size a regular type, and when the disc medium is not a perfect circle but smaller than a predetermined size, discriminates the disc medium as an irregular shape. 4. A disk medium check device for a playback device according to claim 2, wherein: 5. A moving member, which is provided with teeth and moves in conjunction with each of the engaging bodies,
A gear that is interposed between the moving members, meshes with the two teeth, and has a rotation direction opposite to the direction in which the gap between the engagement bodies is widened and the direction in which the gap is narrowed; and a first sensor that detects the amount of rotation of the gear. 5. A disk medium check device for a playback device according to claim 2, 3 or 4. 6. The engagement body is supported by a slide portion movable along a guide portion, and the guide portion has
The loading switch according to claim 1, further comprising a loading switch that operates when at least one of the slide portions comes into contact when the interval between the engagement members is equal to or greater than a predetermined value and drives the loading mechanism. A disk medium check device of the playback device according to any one of the above. 7. The disk medium checking device for a reproducing apparatus according to claim 1, wherein said engaging body is a roller having a surface made of a friction material.