JPH0758580B2 - Disk size detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a disc size detecting device for detecting the size of a disc to be reproduced in a disc player capable of reproducing several types of discs having different diameters. It is a thing.

(B) Conventional Technology With the spread of compact discs in recent years, so-called CD single discs (diameter 8 cm), which are smaller in diameter than ordinary discs (diameter 12 cm), have been standardized. However, when reproducing such a disc, since the diameter of the disc is small, the moment of inertia of the disc is different,
Therefore, it is necessary to change the gain of the disk drive servo for rotating such a disk as compared with that of an ordinary disk. Therefore, the player needs a detection device for detecting the size of the disc.

On the other hand, in the device disclosed in Japanese Utility Model Laid-Open No. 59-149,261 (G11B19 / 12), a plurality of photoelectric elements are arranged in a tray for carrying a disk, and light reflected from the disk surface stored in the tray is provided. The size of the disk is detected depending on the presence or absence of.

However, in such a device, since a plurality of photoelectric elements must be arranged in the tray, the cost is increased and the photoelectric element and the internal circuit must be connected by a lead wire or the like, which is complicated. Work is required.

(C) Problems to be Solved by the Invention Therefore, the present invention can detect the size of a disk with a simple configuration without fail, and the cost is reduced, and the disk size does not require complicated work. It is intended to provide a detection device.

(D) Means for Solving the Problems In view of the above problems, the present invention provides a mounting mechanism for mounting a disc on a turntable, and a first mechanism separated from the turntable in a virtual plane of the disc mounted on the turntable. A detection lever that displaces between a position and a second position close to the turntable; a switch that is operated by moving the detection lever to the second position; and a detection lever that moves the detection lever to the second position. A moving mechanism and a control mechanism that controls the mounting mechanism, and a cam portion that constitutes the control mechanism is configured such that after the mounting of the disc by the mounting mechanism is completed,
The detection lever is configured to be displaced from the first position to the second position. At this time, when a disc having a large diameter is mounted on the turntable, the detection lever is provided on the periphery of the disc. The detection lever is brought into contact with the displacement of the detection lever and regulated.

(E) When a disc having a large action diameter is mounted on the turntable, even if the detection lever is displaced to the second position, the displacement is restricted because the disc contacts the disc peripheral edge on the way.
The switch is not operated. On the other hand, when a disc with a small diameter is mounted, the detection lever can be displaced to the second position and the switch is operated.

(F) Example Hereinafter, an example of the present invention will be described.

I. Overall configuration (a) Pickup mechanism All mechanical parts are mounted on the chassis (100). Fig. 1 ~
In FIG. 5, a pickup (1) for reading information
Is the chassis (10) by the sliding shafts (2) (2).
It is slidably supported with respect to 0). Here, the ends of the shafts (2) and (2) are fixed to two sets of mounting portions (3), (3), (3) and (3) which are arranged to face each other in the opening of the chassis (100). . The pickup (1) is supported by the through holes (4) (4) formed in the pickup (1),
This is done by penetrating the shafts (2) and (2) in (4).

Further, a pair of rack gears (5) and (6) are attached to the pickup (1) for transmitting driving force. Actually, a rack gear (5) (hereinafter referred to as a first rack gear) is screwed to the pickup (1), and the first rack gear (5) is
A rack gear (6) (hereinafter referred to as a second rack gear) is slidably attached to the rack gear. The second rack gear (6) is attached by the protrusion (5a) formed on the upper surface of the first rack gear (5).
Through hole (6a) formed in the second rack gear (6) in (5a)
This is done by engaging (6a). That is, the protrusions (5a) (5a) are formed with locking portions (5b) (5b) at their ends, and these locking portions (5b) (5b) are formed on the upper surface of the second rack gear (6). The sliding contact allows the second rack gear (6) to slide along the through holes (6a) (6a) without coming off with respect to the first rack gear (5). A spring (7) is inserted between these two rack gears (5) and (6) to urge the second rack gear (6) to the left in FIG. 1 with respect to the first rack gear (5). The spring (7)
The urging of the gear by the action acts to remove the backlash generated between the rack gears (5) and (6) and the small diameter portion (60a) of the second gear (60) that meshes, and further, the motor described later. It also acts on the switching operation for switching the transmission of the driving force from the tray to the tray loading operation and the pickup moving operation. In addition to the rack gear used to move the pickup, the second rack gear (6) has a trigger gear (6
b) has been formed.

(B) Disk drive mechanism A disc-shaped turntable (8) is arranged near the pickup (1). Install the turntable (8)
This is done by screwing the spindle motor (9) from the lower surface of the chassis (100) to the chassis (100) and then pivotally mounting the turntable (8) on the spindle shaft of the spindle motor (9).

(C) The clamp mechanism (10) is a clamper, and the rotary shafts (11) and (11) are formed at one end thereof. A disc is crimped to the turntable (8) on the lower surface of the other end of the clamper, and a crimping plate (not shown) that rotates with the rotation of the turntable (8) is rotatably attached to the clamper. It is worn. Further, a boss (12) is formed on the lower surface of the clamper (10) from the position of the rotating shaft, and a projection (13) is formed at the tip of this boss (12). Further, a collar portion (14) (14) is formed on each side of the clamper (10), and the collar portion (14) (14) is formed.
Pins (15) (15) are projectingly provided on the lower surface of the. still,
As will be described later, the pins (15) and (15) act so as to elevate and lower a disc elevating member (lifter) arranged on the disc transport tray when the clamper (10) is rotated.

The rotation axis (11) (11) of the clamper (10) is
The bearings are supported by bosses (16) (16) formed on the chassis (100), and are rotatably supported by the chassis (100). That is, bearings (17) (18) are formed on the upper ends of the bosses (16) (16), and these bearings (17) (18)
After accommodating the rotary shafts (11) (11) of the clamper (10), the clamper (10) is attached by screwing the upper surface of the bearing (18) whose upper surface is open.

Reference numeral (19) is a drive lever for driving the clamper (10), and a circular through hole (1) is formed in a boss (20) arranged on the chassis (100).
After the 9b) is fitted, it is rotatably attached to the chassis (100) by screwing the upper surface of the boss (20). The drive lever (19) has an elliptical slot (2
1) is formed, and the spring (23) is stretched between the end (19a) and the protrusion (22), so that the spring (23) is urged in the counterclockwise direction. Here, the projection (13) formed on the clamper (10) is fitted into the slot (21) of the drive lever (19). Therefore, normally, the clamper (10) is
The edge of the crimping plate side is urged from the drive lever (19) via 3) in the direction of approaching the turntable (8), that is, in the direction of clamping the disc. Since the end edge (19c) of the above contacts the cam gear and its rotation is controlled, it is restricted by this cam gear and is not rotated.

(D) Disc Conveyance Mechanism A tray for conveying discs is supported by support members (24), (24), (24) and (24) formed on the chassis (100) so as to be slidable in one direction. The supporting member (24) is formed with a protrusion (24a) for laterally regulating the tray and a hook (24b) for vertically regulating the tray. Further, the two support members (24) (24) arranged on the front side are provided with ridges (25) (25) on the opposite side surfaces. The ridges (25) (25) are provided to prevent the lifter from being lowered by the external force when the tray is in the pulling position.

FIG. 2 is a diagram showing the structure of the tray. The tray (26) has a circular recess (2
7) has been formed. The recess (27) has a diameter slightly larger than the diameter of the disc. In addition, an opening (28) is formed in the recess (27) to allow movement of the turntable (8) and the pickup (1), and lifters (29) (29) (29) (29) for raising and lowering the disc. Through holes (30), (30), (30), (30) are formed to project. Thus, the disc is housed in the concave portion (27) to thereby form the concave portion (27).
Positioned inside and further lifter (29) (29) (29)
By vertically controlling the (29), it is vertically moved in the concave portion (27) in a horizontal state.

Incidentally, such a tray (26) is devised so that a disc having a smaller diameter than an ordinary disc can be positioned and mounted. That is, an inclined groove (31) that engages with the peripheral edge of the small-diameter disc is formed in front of the recess (27), and the peripheral edge of the small-diameter disc is provided on the upper surface of the two rear lifters of the four lifters. Inclined notches that engage with (32) (32)
Are formed. Accordingly, the peripheral edge of the small-diameter disk engages with the inclined groove (31) and the notches (32) (32), so that the small-diameter disk is positioned and mounted in the recess (27) in an inclined state. Details of such a small-diameter disc positioning and conveying mechanism are disclosed in Japanese Patent Application No. 63-2371, which is a prior application.

The above-mentioned lifter (29) (29) (29) (29) has a pair of two lifters arranged in the front-rear direction and forms a pair of rotary rods (3
3) and (33), respectively. The rotating rods (33) and (33) are pivotally attached to the lower surface of the tray (26) about the rotating shafts (33a) and (33a). Further, a spring (not shown) is inserted between the protrusions (34) and (34) and the lower surface of the tray (26) in the rotating rods (33) and (33),
The lifters (29) (29), (29) (29) are urged so as to project upward from the through holes (30) (30) (30) (30) of the recess (27). Therefore, lifters (29) (29), (29) (2
9) through hole (30) (30), (30) (30) to recess (27)
Project inside. Further, pins (35) and (35) are formed on the rotating rods (33) and (33) so as to face the upper surfaces from through holes (36) and (36) formed in the tray (26).

The through holes (36) (36) engage with the pins (15) (15) on the lower surface of the clamper (10) by the rotation of the clamper (10) when the tray (26) is at the loading completion position. Therefore, when the clamper (10) rotates in the direction of the turntable (8) in this manner, the pin (3) exposed to the outside through the through holes (36) (36).
5) (35) is a pin (1) mounted on the clamper (10).
5) Pressed by (15). At this time, the clamper (1
Since the spring force for urging 0) is larger than the spring force for urging the rotating rod (33), the rotating rods (33), (33) rotate the clamper (10) in the direction of the turntable (8). In response to the movement,
The lifters (29), (29), (29) and (29) are lowered by being rotated against the bias of the spring. Thus, after the disc is loaded into the loading position in the player by the tray (26), the disc (2) is rotated by the rotation of the clamper (10).
It moves up and down in 7) and is clamped or separated from the turntable (8).

The tray (26) configured in this way is further formed with ridges (37) (37) at the lower portions of both side surfaces, and these ridges (37) (3
7) is engaged with the protrusions (24a) ... and the hook portions (24b) of the support members (24), (24), (24), (24) described above, so that the support members (24) (24) (24) (24) slidably supported in the front-rear direction. Furthermore, a rack gear (38) is formed on one side of the tray (26), and the rack gear (3
8) is driven in the front-rear direction by obtaining a driving force from the gear portion described later.

By the way, a small-diameter disc having a small diameter can be mounted on the tray (26) as described above, but the peripheral edge of the small-diameter disc is notched (3
2) Since these must be engaged with (32), it is preferable that these lifters be fixed when mounting a small diameter disc. In this embodiment, paying attention to such a point, as described above, the ridges (25), the front support members (24), (24),
(25) is formed, and the protruding ridges (25) and (25) are provided with the rotating rods (33) and (33) from the position where the tray (26) is pulled out from the player to the position immediately before the loading completion position. ) With a small gap. Therefore, the lifter (29) (2
9), (29) and (29) are pressed and the rotating rods (33) and (33) try to rotate, these rotating rods (33) and (33) are projected onto the ridges (25) and (25). It abuts and regulates its rotation, and thus the lifters (29), (29), (29) and (29) are locked at the projecting position until the loading of the tray (26) is completed.

(E) Disc size discrimination mechanism The disc size is the detection lever (39) and switch (40).
Detected by. The detection lever (39) has a protrusion (41) that comes into contact with the peripheral edge of the disc, an operation portion (42) that operates the switch (40), a through hole (43) that serves as a rotation axis, and one end of a spring. A hook portion (44) that stops and a contact portion (45) that contacts a cam gear described later are formed. The detection lever (39) is rotatably attached to the chassis (100) by passing through the through hole (42) in the shaft (46) embedded in the chassis (100). A spring (48) is stretched between the hook portion (44) and the hook portion (47) on the chassis (100) side so that the spring (48) is urged to rotate counterclockwise.
However, since the contact portion (45) contacts the cam gear, the rotation of the detection lever (39) is restricted, and thereafter the rotation of the cam gear causes the detection lever (39) to be displaced to the disc detection position rotated in the urging direction.

A switch (40) is arranged in the chassis (100) in the vicinity of the operation portion (42) of the detection lever (39), and the operation portion (42) is moved when the detection lever (39) is displaced to the disc detection position. Is turned on by.

In the detection lever (39), the protrusion (41) has the tray (2).
It is arranged to face the side of 6) with a slight gap. When the cam gear rotates after the disc clamping operation is completed, the protrusion (41) is displaced to the disc detection position by the bias of the spring (48). At this time, as shown in FIG. 6, if the clamped disc is of a normal size, the protrusion (41) of the detection lever (39) is in the periphery of the disc (D ₁ ) during the rotational displacement. The switch (40) is not turned on because it abuts against and is restricted in rotation. On the other hand, as shown in FIG. 7, if the clamped disc is a small-diameter disc (D ₂ ), the detection lever (39) is rotated to the disc detection position because the protrusion (41) of the detection lever (39) does not abut the disc periphery. Then, the switch (40) is turned on as described above. Therefore, the size of the disk can be detected by the state of the switch at this time.

(F) Control Gear Mechanism The shape of the cam gear (49) is shown in FIG. 3A is an external perspective view, FIG. 2B is a top view, and FIG. As shown in the drawing, a gear portion (50) is formed on the outer periphery of the cam gear (49). In the gear portion (50), a toothless portion (50a) is formed in a predetermined region of the upper half, and a toothless portion (50b) is also formed in a predetermined region of the lower half. Further, two protrusions (51) (52) are concentrically formed on the upper surface thereof, and a cam portion (51a) having a gradually decreasing diameter is formed on the inner first protrusion (51). . Further, the second ridge (52) is formed in two steps with different outer diameters, and the lower portion (53) having a large inner and outer diameter has a gear portion (53a) formed in a predetermined arc portion. The upper portion (54) has a cam portion (54a) having a gradually decreasing diameter. Furthermore, cam gear (4
On the bottom surface of 9), a ridge (55) is formed at the circumferential position of the region where the toothless portion (50b) is formed, and a protrusion (56) is further formed in the radial direction. . The projection (56) operates so as to indicate the completion of the tray unloading by operating the switch at the rotational position of the cam gear (49) at the tray unloading completion position.

Next, the configuration of the control gear mechanism will be described.

In FIGS. 3 and 4, the driving force from the motor (57) is the pulley (58) pivotally attached to the rotation shaft of the motor (57).
It is transmitted to the cam gear (49) via the first gear (59), the second gear (60), the third gear (61) and the fourth gear (62). That is, the pulley (58) meshes with the large diameter portion of the first gear (59),
The small diameter portion of the first gear (59) meshes with the large diameter portion of the second gear (60), and the large diameter portion of this second gear (60) also meshes with the large diameter portion of the third gear (61). Then, the small diameter portion of the third gear (61) meshes with the upper gear (62a) of the fourth gear (62),
The lower gear (62b) of the gear (62) and the upper half of the gear portion (50) of the cam gear (49) mesh with each other. The small diameter portion (60a) of the second gear (60) meshes with the rack gears (5) and (6) of the pickup mechanism described above to drive the pickup (1).

Thus, the cam gear (49) is rotated by receiving the driving force from the motor (57), but the rotation of the cam gear (49) progresses and the toothless portion (50a) of the gear portion (50) moves to the fourth position. When facing the gear (62), the fourth gear (62) idles, so that the cam gear (49) is not rotated even if the motor (57) is operated thereafter. Further, the lower half (63a) of the fifth gear (63) for driving the tray meshes with the lower half of the gear part (50) of the cam gear (49),
Further, the upper gear (63b) of the fifth gear (63) meshes with the rack gear (38) of the tray (26) described above. Therefore, the driving force of the motor (57) transmitted to the cam gear (49) by the gear group described above is transmitted to the tray (26) via the fifth gear (63).
Be transmitted to. However, as mentioned above, the cam gear (4
Since the toothless portion (50b) is formed in the lower half of the gear portion (50) of 9), the cam gear (49) rotates and the toothless portion (50b) of the fifth gear (63) is rotated. When facing the lower gear (63a), the driving force from the motor (57) is not transmitted to the fifth gear (63), and thus the tray (26) is not driven.

Further, a trigger member (64) is pivotally supported (65) on the chassis (100) so that the hook portion (66) of the trigger member (64) and the hook portion (66) of the chassis (100). Between the springs (6
It is urged to rotate counterclockwise by stretching 7). The trigger member (64) is provided with a fan-shaped collar portion (68), and the collar portion (68) has a gear (69) along the periphery thereof.
Are formed. Further, a trigger gear (70) is formed on the upper side surface of the trigger member (64). The trigger member (64) is urged by the spring (67) as described above, but the collar portion (68) has the second protrusion (5) of the cam gear (49).
Since it contacts the lower part (53) of (2), its rotation is restricted. Also, when the cam gear (49) is at the predetermined turning position,
The gear portion (53a) of the lower portion (53) of the second ridge (52) is attached to the collar portion (6).
When facing the gear 8), the gear portion (53a) meshes with the gear (69) of the collar portion (68), so that the trigger member (64) rotates in conjunction with the rotation of the cam gear (49). The trigger member (6
The trigger gear (70) of 4) meshes with the trigger gear (6b) arranged on the second rack gear (6) of the pickup mechanism.
Thus, the trigger member (64) is rotationally controlled by the cam gear (49) and the second rack gear (6) of the pickup mechanism, and the control operation controls the cam gear (49) and the pickup (1).

Drive lever (19) for driving the above-mentioned clamper (10)
Also, one end of the detection lever (39) for disc size determination abuts on the outer circumference of the upper portion (54) of the first ridge (51) and the second ridge (52) of the cam gear (49), respectively. These are rotationally controlled by the cam portions (51a) and (54a) of the first and second ridges (51) and (52) according to the rotation of the cam gear (49).

(G) Damage prevention mechanism When the motor (57) is driven as described above, if the tray is forcibly stopped while the tray is being conveyed, the motor (5
The load may be applied between 7) and the transmission gear, and the motor (57) or the transmission gear may be damaged. In this embodiment, the fourth gear (62) that meshes with the gear portion (50) of the cam gear (49) is devised to prevent such damage.

FIG. 9 shows the configuration. That is, the fourth gear (62) is composed of two independent gears (upper gear (62a) and lower gear (6).
2b)), these gears are inserted into the shaft (71), and then the upper surface of the upper gear (62a) is pressed against the leaf spring (72) to form a damage prevention mechanism. The upper gear (62a) and the lower gear (62b) are respectively gear parts (73) (73) formed on the outer peripheral surface as shown in FIG. 10 and engaging parts (74) (74) formed on the joint surface. ) And through holes (75) (75) formed in the central axis. Further, the engaging portion (74) is formed by a protrusion (74a) and a recess (74b) having the same width, and an inclined portion (74c) connecting them. Thus, when the upper gear (62a) and the lower gear (62b) are mounted on the shaft (71) as described above, the protrusion (74a) and the recess (74b) of the one engaging portion (74) are , The recess (74b) and the protrusion (74a) of the other engaging portion (74) are engaged with each other, whereby the upper gear (62a) and the lower gear (62b) are connected.

The operation of the damage prevention mechanism will be described. For example, when the tray (26) is conveyed and the conveyance of the tray (26) is caught by an internal wiring of the player or the like, the fifth gear (63) and the cam gear (49). ), The lower gear (62b) of the fourth gear (62) is locked. Thus, the lower gear (62
When b) is locked, lower gear (62b) and upper gear (62b)
The inclined part (74c) of the engaging part (74) (74) that connects with a)
The reaction force in the rotational direction of these gears acting between (74c) increases, so that the upper gear (62a) resists the bias of the leaf spring (72) and acts on the inclined portion (74c) of the lower gear (62b). Along with this, the engaging portions (74, 74) are disengaged upward, and the engagement of the engaging portions (74, 74) is temporarily released. Therefore, although the lower gear (62b) is locked, the upper gear (62a) is rotated by being slightly displaced upward. And then the upper gear (62
When a) slightly rotates, the engaging portions (74) (74) of the upper gear (62a) and the lower gear (62b) engage at the position shifted by one step in the circumferential direction, and the upper gear (62a). And lower gear (6
2b) and are connected again.

In this way, the upper gear (62a) repeatedly connects and disconnects with the lower gear (62b) to rotate only itself. Therefore,
As mentioned above, even if the tray is blocked during transportation,
The load on the motor (57) does not increase to the left, so that the motor (57) does not burn out. In addition, the motor (5
There is no particularly large drag acting between the gears interposed between 7) and the tray (26), so that these gears are not damaged.

Instead of forming the engaging portions (74) and (74) at the joint between the upper gear (62a) and the lower gear (62b), for example, a member having an appropriate friction coefficient is provided. However, the upper gear (62a) may be rotated by sliding on the joint when the lower gear (62b) is locked.

(H) Tray Positioning Mechanism FIG. 11 is a bottom view showing the tray positioning mechanism for positioning the tray (26) at the loading position. That is, the tray positioning mechanism has a protrusion (76a) at the tip formed at the bottom of the fifth gear (63) that meshes with the rack gear (38) of the tray (26).
Elastic tongue (76) with a cam gear (49) as previously described
It is composed of a ridge (55) formed on the lower surface.

When the tray (26) is carried in, as shown in FIG. 7A, even if the fifth gear (63) rotates due to the rotation of the cam gear (49), the elastic tongue (76) stays in the projection (55). Since it does not make contact, it idles at the bottom of the cam gear (49). After that, the tray (2
When the carrying-in of 6) is completed, the protrusion (76a) of the elastic tongue (76) formed on the fifth gear (63) moves to the cam gear (4).
9) Contact the outer surface of the ridge (55) on the lower surface (see (b) in the figure). Then, when the cam gear (49) further rotates and the loading of the tray (26) is completed, the protrusion (76a) at the tip of the elastic tongue (76) bends the elastic tongue (76) and the protrusion ( 55). As described above, the protrusion (76a) formed on the fifth gear (63) allows the cam gear (4) to move while the elastic tongue (76) is flexed.
9) The 5th gear (63) because it slides against the ridge (55) on the lower surface.
Is urged in the tray loading direction by the reaction force from the elastic tongue piece (76) thus bent. Thus, the tray (26) is subjected to such biasing, and at this time, the tray rear end portions (26a) (26a
a) comes into contact with the ridges (16a) (16a) provided on the bosses (16) (16) for supporting the clamper described above,
The tray is pressed against the protrusions (16a) (16a) to position the tray at the carry-in position. At this time, the lower gear (63a) of the fifth gear (63) is replaced by the toothless portion (5) of the cam gear (49).
Since the cam gear (49) is rotated after that, the fifth gear (63) is not driven.

II. Operation The operation of this embodiment will be described below with reference to FIGS. 12 to 16.

(A) Tray carrying-in operation FIG. 12 is a plan view of the control mechanism section showing a state where the tray (26) is carried out of the player and the disc is attached and detached (see FIG. 5). At this time, since the clamp lever (19) of the clamper (10) is in a position against the biasing force of the spring (23) due to the contact of the clamp lever (19) with the first protrusion (51) of the cam gear (49), 8) It is located in a non-clamp position apart from 8). In addition, since the contact portion (45) of the detection lever (39) is in contact with the upper portion (54) of the second protrusion (52) of the cam gear (49), the detection lever (39) is in a position against the bias of the spring (48). It is located in. Furthermore, the pickup (1) is fixed to the innermost position of the disc that is closest to the turntable (8),
The first and second rack gears (5) and (6) arranged on the pickup (1) are the small diameter portion (60a) of the second gear (60).
Has been released from chewing. Therefore, even if the above-mentioned motor (57) is driven and the second gear (60) is driven, the driving force from the motor (57) is not transmitted to the pickup (1), so that the pickup (1) is The disc is fixed at the inner circumference position.

The pickup (1) is fixed by a trigger member (64). In the above-mentioned state, the second rack gear (6) is displaced rightward against the bias of the spring (7) with respect to the first rack gear (5), and therefore the first rack gear (5) moves toward the spring (7). ) Is pressed against the boss (77). Here, the second rack gear (6) also has the spring (7).
The trigger member (64) regulates the displacement to the left, though it is biased to the left by the. That is, the trigger gear (70) of the trigger member (64) is the second rack gear (6).
It is meshed with the trigger gear (6b) and is biased counterclockwise by the bias from the spring (7).
Since the flange portion (68) of the trigger member (64) is in contact with the lower portion (53) of the second protrusion (52) of the cam gear (49), the trigger member (64) is not rotated. Therefore, the pickup (1) is fixed at the above-mentioned inner circumferential position of the disc.

When the motor (57) is driven to carry in the tray (26) from such a state, the first, second, third and fourth gears (59), (60), (61), (62) ), The cam gear (49) is driven clockwise, and in conjunction with this, the fifth gear (63) is rotated counterclockwise to start loading the tray (26). On the other hand, when the tray (26) is carried in as described above, the clamp lever (19), the detection lever (39) and the trigger member (64) are respectively provided with the first protrusion (51) and the first protrusion (51) of the cam gear (49). The members are kept in the above-mentioned positions because they are in sliding contact with the upper portion (54) of the second protrusion (52) and the lower portion (53) of the second protrusion (52).

In this way, the tray (26) is further loaded, and the cam gear (49)
When the rotation of moves to the position shown in Fig. 13, the cam gear (49)
Since the toothless portion (50b) of the No. 5 faces the lower gear (63a) of the fifth gear (63), the meshing of the fifth gear (63) and the cam gear (49) is released, and the tray (26) is completely loaded. To do. At this time, as described above, the projection (76a) provided on the fifth gear (63) bends the elastic tongue (76) while the cam gear (4
9) It is pressed against the ridge (55) on the lower surface, and the return force of the elastic tongue (76) urges the fifth gear (63) in the tray loading direction,
The tray (26) is positioned at the carry-in position such that the rear end portion (26a) of the tray is pressed against the ridge (16a).

(B) Disc clamp operation When the cam gear (49) further rotates from the state shown in FIG. 13,
Eventually, the cam portion (51a) of the first protrusion (51) reaches the contact position with the clamp lever (19) (see FIG. 14). Therefore, the clamp lever (19) rotates counterclockwise by the further rotation of the cam gear (49), and the clamper (10) accordingly.
The protrusion (13) on the lower surface is displaced in the direction of arrow A, whereby the clamper (10) is displaced in the direction of the turntable. When the clamper (10) is displaced in the turntable direction, the pins (15) and (15) formed on the lower surface of the clamper (10) firstly pass through the holes (3) formed on the upper surface of the tray (26).
6) Inserted in (36), as described above, pins (35) (35)
Press. The pivoting rods (33) (33) are pivoted by the pressing operation of the pins (35) (35), and the lifters (29) (29), (29) (29) are lowered accordingly. Then, the disks placed on the lifters (29), (29), (29), (29) descend and are placed on the turntable (8). Then, the upper surface of the disc thus placed on the turntable (8) is pressed by a crimping plate (not shown) rotatably attached to the clamper (10) to turn the disc turntable (8). ) Is completed.

In addition, the clamp lever (1
The relationship between 9) and the cam gear (49) is as shown in Fig. 14, but at this time, between the edge (19c) of the clamp lever (19) and the cam portion (51a) of the first protrusion (51). Is designed to have a clearance so that the biasing force of the spring (23) becomes the pressing force of the clamp. After that, even if the cam gear (49) further rotates, the diameter of the cam portion (51a) of the first protrusion (51) does not change, so the clamp lever (19)
A gap is secured between the end edge (19c) and the cam portion (51a) of the first protrusion (51), so that the pressing force of the clamp does not change any more.

(C) Disc size determination operation When the cam gear (49) further rotates after the disc clamping shown in FIG. 14 is completed, the cam gear (4) is rotated as shown in FIG.
The cam portion (54a) of the second protrusion (52) of (9) is attached to the detection lever (3
The detection lever (39) is rotated counterclockwise by the bias of the spring (48), facing the contact portion (45) of (9). At this time, the state of the switch (40) varies depending on the size of the disc mounted on the turntable (8). That is, if the disk diameter is large, as described above, the switch (40)
Remains OFF (see FIG. 6), and if the diameter is small, the switch (40) is ON (see FIG. 7). Then, the size of the disc is determined by whether or not the switch (40) is turned on by the time the switch (78) indicating the completion of disc loading described later is operated.

At this time, the switch (40) is closed even when no disc is attached to the turntable (8), but the presence or absence of such a disc is detected by the pickup (1).
It is detected by the presence / absence of reflected light from the disk of the beam emitted from the disk.

(D) Pickup movement operation At approximately the same time as the disc size determination operation described above, the gear portion (53a) of the second protrusion (52) of the cam gear (49) is moved to the gear portion (69) of the flange portion (68) of the trigger member (64). ) (See Fig. 15). Therefore, until then, the second ridge (5) of the cam gear (49)
The trigger member (64) regulated by 2) is rotated counterclockwise by meshing with the gear portion (69).
When the trigger member (64) thus rotates, the second rack gear (6) attached to the pickup (1) is displaced in the urging direction of the spring (7), whereby the second rack gear (6). And the small diameter portion (60a) of the second gear (60) mesh with each other, and the trigger gear (70) of the trigger member (64) and the trigger gear (6b) of the second rack gear (6) are disengaged (first (See Figure 16). Therefore, the pickup (1) is the second
The driving force from the motor (57) is transmitted via the rack gear (6). Then, when the pickup (1) is slightly displaced in the outer peripheral direction in this manner, the switch (78) is opened, and the end of the above-described loading is detected by the change in the state of the switch (78), and the motor (57). Is stopped.

At this time, in the cam gear (49), the toothless portion (50a) formed on the upper part of the outer periphery of the cam gear (49) is the lower gear (6) of the fourth gear (62).
2b), the fourth gear (62) and the cam gear (49) are disengaged from each other, so that they are not rotated. Furthermore, since the trigger member (64) is biased by the spring (67) in the counterclockwise direction about the shaft (65), one end of the collar portion (68) has a boss (10).
Rotate until it hits the outer circumference of 1) and stop.

Since the gear portion (69) of the flange portion (68) of the trigger member (64) and the gear portion (53a) of the second protrusion (52) are meshed with each other, the cam gear (49) is interposed via the trigger member (64). The spring (67) receives a clockwise rotational bias, and the cam gear (49) is fixed at this position by stopping the trigger member (64).

(E) Disc Reproducing Operation When the player performs a disc reproducing operation after the above-mentioned disc loading operation is completed, the pickup (1) is operated and the disc is irradiated with a beam. Then, the presence / absence of the disc is determined by detecting the presence / absence of the reflected light by the photosensor of the pickup (1). Here, when the absence of the disc is detected, the player is set to the stop mode. On the other hand, when the presence of the disk is detected, the spindle motor (9) for driving the turntable (8) is operated based on the above-mentioned discrimination of the size of the disk. That is, if the disk is large, the moment of inertia of the disk is large, so the spindle motor (9)
Set the gain of the control system large, and conversely, set the gain small if the disc is small. Then, after rotating the disc in this manner, the pickup (1) is temporarily moved in the inner circumferential direction of the disc by a small amount, and the table of contents information (TOC: Table-Of-Content) recorded on the inner circumferential portion of the disc is recorded.
After reading s), normal playback is performed. When the reproduction of the disc is completed, the pickup (1) is moved to the innermost circumference, and the switch (78) is closed by the protrusion on the right side of the first rack gear (5). The power supply is stopped. Then, the player enters a standby state waiting for the next operation command (see FIG. 16).

(F) Disk unloading operation Disk unloading is performed in the reverse order of the above. That is, when the motor (57) is driven in the direction opposite to that when the disk is loaded, the second rack gear (6) of the pickup (1) is driven.
Is displaced to the right further than the state shown in FIG. When the second rack gear (6) is displaced, the trigger gear (6b) of the second rack gear (6) and the trigger gear (70) of the trigger member (64) mesh with each other, and the further second rack gear (6). Due to this displacement, the trigger member (64) is rotated clockwise against the bias of the spring (67). The cam gear (49) is rotated counterclockwise by the rotation of the trigger member (64), the cam gear (49) and the fourth gear (62) are re-engaged, and the cam gear (49) is rotated by the motor (57). It is driven to rotate counterclockwise with the driving force from.

When the cam gear (49) is thus rotated counterclockwise, the second rack gear (6) is further displaced via the trigger member (64), and eventually the collar portion (68) of the trigger member (64). Of the gear portion (69) of the cam gear (49) and the gear portion (53a) of the second protrusion (52) of the cam gear (49) are released, and the collar portion (68) is below the second protrusion (52). It will be in sliding contact with (53). Almost at the same time, the pickup (1) moves to the innermost circumferential position, so that the turntable (8) side wall (1a) of the pickup and the turntable (8) side wall (102) inside the opening of the chassis (100). ), The pickup (1) and the first rack gear (5) stop. After that, since the second rack gear (6) is displaced via the trigger member (64), the second rack gear (6) is displaced while compressing the spring (7), and the second rack gear (6) and the small diameter portion (60) of the second gear (60). 60a) is disengaged. As a result, the pickup (1) is fixed at the inner circumferential position of the disc. After that, the cam gear (49) moves to the motor (5
When it is further rotated by 7), the clamper (10) is separated from the turntable (8) by the procedure opposite to the above, and the discs are lifted (29) (29) in conjunction with this.
(29) Lifted by (29) and separated from the turntable (8), the cam gear (49) and the lower gear (63a) of the fifth gear (63) mesh with each other, and the fifth gear (63)
Is rotated, and the tray (26) is moved in the carry-out direction. Then, when the tray (26) reaches a predetermined carry-out position, the projection (56) on the lower surface of the cam gear (49) has a switch (not shown).
Closed, the drive of the motor (57) is stopped, and the tray (26)
Is completed.

(G) Effect of the Invention As described above, according to the disk size detection device of the present invention, the cam portion constituting the control mechanism moves the detection lever from the first position to the second position after the mounting mechanism completes the mounting of the disk. It is designed to be displaced. Furthermore, at this time, if a disc with a large diameter is mounted on the turntable, the detection lever comes into contact with the periphery of this disc and the displacement of the detection lever is restricted. ,
The size of the disc is determined by the completion of the disc loading. Therefore, a plurality of photoelectric elements are not required, the cost can be reduced as compared with the conventional device, and the complicated wiring work and the like are unnecessary, so that the assembling work is simplified.

Further, the control mechanism is configured to control both the detection lever and the mounting mechanism for mounting the disc on the turntable. The detection lever is displaced between the first position separated from the turntable and the second position approached to the turntable in the virtual plane of the disk mounted on the turntable by the cam portion constituting the control mechanism. Then
The movement of the switch to the second position actuates the switch, so that the detection of the disk size by the control mechanism is performed at a good timing.

Therefore, in a disc player that automatically mounts and reproduces several discs having different diameters, the disc size can be reliably detected.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a perspective view showing a tray, FIG. 3 is a perspective view of a mechanism portion, and FIG. FIG. 5 is a plan view with the tray removed, FIG. 5 is a plan view when the tray is pulled out, FIGS. 6 and 7 are plan views for explaining the disc size determination mechanism, and FIGS. 8A, 8B and 8C. Is a perspective view showing a cam gear, a plan view, a bottom view, and FIG. 9 is a side view showing a breakage preventing mechanism.
The figure is a perspective view showing the fourth gear, FIG. 11 is a bottom view showing the tray positioning mechanism, and FIGS. 12, 13, 14, 15, and 16 are for explaining the operation of the control mechanism. In this figure, (a) is a plan view and (b) is a side view. (10), (26) …… Clamper, tray (mounting mechanism),
(39) …… Detection lever, (40) …… Switch, (49)…
… Cam gear (control mechanism).

Claims (1)

[Claims] 1. A mounting mechanism for mounting a disc on a turntable, a first position spaced from the turntable and a second position close to the turntable in a virtual plane of the disc mounted on the turntable. A detection lever that is displaced between the two, a switch that is operated by moving the detection lever to the second position, and a control mechanism that controls the movement of the detection lever to the two positions and the mounting mechanism. The cam portion constituting the control mechanism is configured to displace the detection lever from the first position to the second position after the mounting of the disc by the mounting mechanism is completed. When a disc having a large diameter is mounted on the disc, the detection lever comes into contact with the peripheral edge of the disc to restrict the displacement of the detection lever. Disk size detection device that.