JPH04137255A - Tray mechanism of disk plate - Google Patents

Abstract

PURPOSE:To move a rack and a pinion integrally at all times and to eliminate the possibility that they are disengaged even if a tray is displaced with lateral force by making the rack-side flank of a rib slide on the head part of a shaft supporting the pinion at the disk unloading position of the tray or putting them opposite each other at a slight interval. CONSTITUTION:The rib 47 which extends in parallel to the rack 45 is projected on the reverse surface of the tray 44 and at the disk unloading position of the tray 44, the flank of the rib 47 on the side of the rack 45 slides on or faces the head part of the shaft part 48, which supports the pinion 43 on a fixed chassis 13, at a slight interval. Therefore, when the tray 44 is displaced in the direction where the rack 45 and pinion 43 are disengaged from each other, the rib 47 of the rack 45 presses the head part of a shift 48 against the rack 45, which is caused to elastically deform; and the pinion 43 moves by a distance corresponding to the displacement quantity of the track 44 and the engagement between the rack 45 and pinion 43 is maintained. Consequently, the rack 45 and pinion 43 of the tray 44 move integrally at all times and are never disengaged from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disc player capable of recording or reproducing signals on a disc-shaped recording medium such as a compact disc or a laser disc.

(Prior Art) Generally, in a disc player, various mechanisms for signal reproduction are arranged in a flat cabinet (1) as shown in Fig. 1, and a front panel opening (11) is provided.
To do this, a tray (44) on which a disk is to be placed is provided so as to be retractable, and the tray (44) is driven from the disk ejection position to the disk storage position in the cabinet (1) to place the disk on the tray. Set to the signal playback position.

A guide mechanism that guides the reciprocating movement of the tray (44) and a drive mechanism that reciprocates the tray (44) along the guide mechanism are provided in the cabinet (1). A rack (45) provided on the back side of the rack (44) along the tray movement direction, and a pinion (45) that is rotationally driven by a motor (21) and meshes with the rack (45).
43).

(Problem to be Solved) However, in conventional disc players, the engagement between the tray and the guide mechanism is complete when the tray has fully entered the cabinet, and as the tray approaches the disc ejection position, the relationship between the two becomes smaller. The engagement becomes shallow, and the function of the guide mechanism, which is supposed to hold the tray in a constant position, deteriorates.

Therefore, when a horizontal force perpendicular to the tray movement direction is applied to the end of the tray while the tray is set at the disc ejection position, the tray may be affected by the play between the tray and the guide mechanism or by the guide mechanism itself. Due to the deformation of the tray, the rack is displaced in the direction of the force, and the rack of the tray is separated from the pinion. If the tray moves in the protruding/retracting direction in this state, the meshing phase between the two will shift when the tray is driven, causing errors in subsequent disk ejection and storage positions, which will cause problems in tray driving.

An object of the present invention is to ensure that even if the tray is displaced by a lateral force when the tray is installed at the disk ejection position, the rack of the tray and the pinion that meshes with the rack always move in unison. It is an object of the present invention to provide a tray mechanism that does not have the risk of coming off.

(Means for Solving the Problems) In the tray mechanism of the disc player according to the present invention, as shown in FIG.
A rib (47) extending parallel to the rack (45) is provided to protrude at least at the end on the disc storage position side, and at the disc ejection position of the tray (44), the rib (47) extends parallel to the rack (45) of the rib (47).
) side surface is in sliding contact with the head of the shaft (48) which is erected on the fixed chassis (13) and supports the pinion (43), or is opposed with a slight interval therebetween.

(Function) As shown in Figure 32, the tray (44
) is acted upon by a force F in a direction perpendicular to the direction of tray ejection and retraction, and when the tray (44) is displaced in a direction that disengages the rack (45) and pinion (43), the rack (
The rib (47) of 45) presses the head of the shaft (48) toward the rack (45), causing the shaft (48) on the fixed chassis (13) to elastically deform. Accordingly, the pinion (43) moves by a distance corresponding to the amount of displacement of the tray (44), and the meshing state of the rack (45) and pinion (43) is maintained.

(Effects of the Invention) According to the tray mechanism of the disc player according to the present invention,
Even when a lateral force is applied to the tray at the disk ejection position, the rack of the tray and the pinion that meshes with the rack always move together, and there is no risk of them coming out of mesh.

(Example) Hereinafter, an example in which the present invention is implemented in a compatible disc player capable of reproducing signals from a plurality of types of discs having different diameters and thicknesses, such as compact discs and laser discs, will be described in detail.

It should be noted that the examples are for illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

As shown in Figure 1, a tray (44) is retractably installed in the front panel opening (11) of the cabinet (1), and the tray (44) is attached to the chassis (44) fixed in the cabinet (1). 13) The reciprocating movement is guided by a plurality of upper guide support members (16).

Inside the cabinet (1), on the chassis (13), there is a tray drive mechanism (4) for reciprocating the tray (44).
), a motor lifting mechanism (5) for driving the spindle motor up and down together with the turntable (50), a pickup device (9) comprising an optical pickup (90) and a tilt mechanism (100), and driving these mechanisms. A drive gear mechanism (2), a disk clamp mechanism (7) equipped with a clamper (O), etc. are provided.

The turntable (50) has a chassis (13) as described below.
It is attached so that it can be raised and lowered against the chassis (1
It projects upward from the central hole (17) provided in 3).

The driving gear mechanism (2) uses a loading motor (21) as a power source to drive a belt transmission mechanism (22) and a first gear (2).
3), the power is transmitted to the tray drive mechanism (4) through the path of the second gear (24), the third relay gear (3), the fourth gear (27), and the fifth gear (41), and The sixth gear (37) meshing with the third gear (3) and the second gear (24) constitute an output section for the pickup device (9), and the third gear (3) raises and lowers the turntable (50). It constitutes an output section for driving.

The tray (44) is provided with a mounting section for a plurality of types of discs, and an opening (46) from which the turntable (50) is exposed is provided in the center of the mounting section.

The configuration of each mechanism will be described in detail below.

(2) Figures 10(a) and 10(b) show the loading motor (21) and belt transmission mechanism (2) that constitute the driving gear mechanism (2).
22), and the first to fifth gears (23) (23) (
24)(3)(27)(41) are a plan view and a cross-sectional view showing the components arranged in a row along the power transmission path to the tray drive mechanism. In addition, FIGS. 11(a) and 11(b) show the loading motor (21), belt transmission mechanism (22), second gear (24), third gear (3), and sixth gear (37).
FIG. 2 is a plan view and a sectional view showing the devices arranged in a row along a power transmission path to the pickup device.

Each of the gears has a multi-stage structure with different configurations in the height direction. The second gear (24) includes a large-diameter gear part (25) that constantly meshes with the first gear (23), and a pinion part (26) that can mesh with the rack (98) that constitutes the pickup device.
, and a small diameter gear part (20). Third gear (3
) is provided with a main gear part (31) that meshes with the small diameter gear part (20) of the second gear (24), and
The auxiliary gear portion (32) has a tooth surface only in a predetermined angular range. A toothless portion (31a) is provided at the upper end portion of the main gear portion (31) over approximately half the circumference. 4th gear (27
) includes a small diameter gear part (28) and a large diameter gear part (29) that can mesh with the sub gear part (32) of the third gear (3). The fifth gear (41) is the fourth gear (27)
A gear portion (42) that constantly meshes with the large-diameter gear portion (29) of the tray drive mechanism, and a pinion portion (43) that constantly meshes with the rack (45) constituting the tray drive mechanism. Further, the sixth gear (37) includes a gear portion (38) that constantly meshes with the main gear portion (31) of the third gear (3), and a pinion portion (39) that constantly meshes with the rack (98). It is equipped with

Further, the third gear (3) has first and second convex surfaces (34) (35) and a fourth convex surface (34) (35) of a cylindrical surface over a predetermined angle range on the upper part of the main gear part (31) and the sub gear part (32). The gear (27) has a cylindrical concave surface (27a) between the small diameter gear part (28) and the large diameter gear part (29), and the sixth gear (37) has a pinion part (3
A cylindrical concave surface (37a) is formed on the upper part of each of the parts 9). The convex surfaces (34) (35) of the third gear (3) are the concave surfaces (27a) of the fourth gear (27) and the sixth gear (37), respectively.
can be engaged with the concave surface (37a) of.

Tray Drive (4) As shown in Fig. 1, a rack (45) extending in the tray ejection/removal direction is attached to the back surface of the tray (44), and the rack (45) and the pinion portion (4I) of the fifth gear (4I) are attached to the rear surface of the tray (44). 43
) are engaged.

Therefore, when the first gear (23) is driven counterclockwise by the loading motor (21) as shown in FIG.
The third gear (3) rotates counterclockwise via the second gear (24), and the sub gear part (32) of the third gear (3) rotates to the fourth gear.
It meshes with the small diameter gear portion (28) of the gear (27). As a result, the rotation of the loading motor (21) is further transmitted to the fifth gear (41) via the fourth gear (27), and the pinion portion (43) of the fifth gear (41) is driven in the tray storage direction. It is. As a result, the tray (44) is carried from the disk ejection position shown in Figs. 1 and 2 into the cabinet as shown in Fig. 3, and is finally installed at the loading completion position shown in Fig. 4. be. In this state, the front panel opening (11) of the cabinet (1) is closed by the front edge of the tray (44).

In the tray loading process, the turntable (50) is held at the lower end as described later, and the pickup (90) is placed at a low position where it does not interfere with the tray (44) by the operation of the tilt mechanism (100). (See Figures 7 and 8).

Also, during this process, the pinion part (26) of the second gear (24)
The rack (98) of the pickup device (9) is disengaged (see FIGS. 2 to 4), and the binion portion (26) rotates idly.

Also, the gear part (38) of the sixth gear (37) shown in FIG.
and the missing tooth portion (31a) of the main gear portion (31) of the third gear (3).
) are opposed to each other, and the concave surface (37a) formed on the sixth gear (37) faces the third gear (37) as shown in FIGS. 2 to 4.
3), the sixth gear (37) is locked in a stopped state. Therefore, the rack (98) of the pickup device (9) is not driven during this process.

In the tray loading completion state shown in FIG. 4, the auxiliary gear portion (32) of the third gear (3) and the small diameter gear portion (28) of the fourth gear (27) are disengaged, and the third gear ( The first convex surface (34) of 3) engages with the concave surface (27a) of the fourth gear (27), and the fourth gear (27) is locked in a stopped state. Therefore, in this state, the tray (44) is also locked at the loading completion position.

The tray (44) is unloaded by rotating the loading motor (21) in the opposite direction and driving the fifth gear (41) clockwise.

By the way, in the tray ejection state shown in Figure 2, the tray (4
Since the number of guide support members (16) that engage with the guide support member (16) is small, when a force is applied to the tray (44) in a direction perpendicular to the direction of protrusion and retraction, the tray (44) will engage with the guide support member (16).
) and the elastic deformation of the guide support member (16), the rack (45) and the pinion portion (43) of the fifth gear (41) are disengaged from each other due to displacement in the direction of force application. There is a risk. If the tray (44) moves in the loading direction in this state, the subsequent phase of engagement between the rack (45) and the pinion portion (43) will shift, causing an error in the disk loading position.

Therefore, in this embodiment, as shown in FIGS. 2 and 31,
A rib (47) extending downward along the end of the rack (45) on the disk storage side is provided on the back surface of the tray (44), and the side surface of the rib (47) on the rack (45) side is 5
The gear (41) is slidably connected to the head of the shaft (48) that supports the gear (41), or is opposed to the head of the shaft (48) with a slight gap therebetween.

As shown in Fig. 32, a force F in the direction of the arrow is applied to the tray (44).
When the tray (44) moves to the right with respect to the chassis (13), the rib (47) moves together with the tray (44) and presses the head of the shirt (48). , the shaft (48) is elastically deformed and the fifth gear (41
) is displaced to the right. Therefore, the pinion portion (43) of the fifth gear (41) moves following the movement of the tray (44), and is maintained in mesh with the rack (45).

Motor (5) As shown in FIG.
) are guided up and down. A spindle motor (51) is attached to the motor base (52), and a turntable (50) is fixed to the output shaft of the motor. On the top surface of the motor base (52) is a chassis (13).
A plurality of positioning seats (53) for defining the rising end of the motor base (52) are provided on the back surface of the motor base (52), and
Three pins (54) are provided protruding from each side of the base.

A pair of slide drive plates (55) (55) are arranged on both sides of the motor base (52), and each slide drive plate (55) includes a plurality of guide members protruding from the back surface of the chassis (13). (19), it is supported so as to be able to reciprocate in the direction of tray ejection and retraction (see FIGS. 7 to 9). Both slide drive plates (55) (55) have first to third cam grooves (56) extending diagonally on their inner surfaces, respectively.
(57) (58) is recessed. As shown in FIG. 13, the first cam groove (56) and the third cam groove (58) have the same shape and include inclined cam portions (56a) (58a) and horizontal cam portions (56b) (58b). It is growing. On the other hand, the second cam groove (57) includes a first inclined cam part (57a) and a second inclined cam part (57b) having a gentler inclination angle than the first inclined cam part (57a).
It is equipped with Further, a long hole (55a) and a locking portion (55b) are formed at the rear end of the slide drive plate (55).

As shown in Figure 12, pins (54) protruding from both sides of the motor base (52) are attached to both slide drive plates (55) (55).
), and the motor base (
52) constitutes a pair of left and right cam mechanisms that move up and down.

A relay drive plate (64) and a spring (59) are interposed between both slide drive plates (55) (55). The relay drive plate (64) has protrusions (67) (6) formed on both sides.
7) are respectively fitted into the elongated holes (55a) of the slide drive plate (55) with plenty of room. Moreover, the spring (59) is
A support piece (
66), and slides both ends of the spring onto the driving plate (
55) It is engaged with the locking part (55b) of (55).

On the upper surface of the relay drive plate (64), a drive lever (6
) is provided with an elongated hole (65) into which the pin (62) engages.

Therefore, the relay drive plate (64) is moved by the drive lever (6).
When the slide drive plate (55) is moved rearward, both slide drive plates (55) (55) are pulled rearward via the spring (59).
The operation of the cam mechanism causes the motor base (52) to be driven upward.

7 to 9 show how the spindle motor (51) is raised. As shown in FIG. 7, when the tray (44) is being loaded, both slide drive plates (55)
is at the most advanced position, and the spindle motor (51) and turntable (50) are set at a low standby position where they do not interfere with the tray (44).

After the tray (44) reaches the loading completion position as shown in Fig. 8, when the slide drive plate (55) moves rearward (to the left in the figure) by the pull of the spring (59), the pin of the motor base (52) (54) is the slide drive plate (5
5) first, second and third cam grooves (56) (57) (
58) inclined cam portions (56a) (57a) (58a
), the spindle motor (51) and turntable (50) rise together with the motor base (52). In this process, the turntable (50) lifts the disk (120) on the tray (44) from the tray mounting surface and brings the disk into contact with the clamper (70) of the disk clamp mechanism (7).

When the slide drive plate (55) is further pulled to the left, the two pins (front and rear) of the motor base (52) are pulled out as shown in Figure 9.
54) (54) is the horizontal cam portion (56b) of the first and third cam grooves (56) (58) of the slide drive plate (55).
58b), the central pin (54) of the motor base (52) moves to the second inclined cam portion (57b) of the second cam groove (57) of the slide drive plate (55).

In this state, the slide drive plate (55) is further pulled slightly to the left, and the positioning seat (55) on the motor base (52) is driven by the second cam part (57b).
)- is pressed against the back surface of the chassis (13), and the turntable (50) is accurately positioned and held at the rising end.

At this time, the disc (12) on the turntable (50)
0) is reliably clamped by the disk clamp mechanism (7) as described later.

In addition, in the state shown in FIG. 9, the spring (5) shown in FIG.
9) is elastically deformed, and the projections (67) (67) of the relay drive plate (64) fit into the long holes (67) of the slide drive plate (55).
55a) It shifts rearward within the margin of (55a). Therefore, the positioning seat (53) of the slide drive plate (55) is moved toward the chassis (13) by the repulsive force of the spring (59).
It will be held in pressure contact with.

Next, a mechanism for rotating the drive lever (6) will be explained.

As shown in FIGS. 2 to 6, an L-shaped drive lever (6) is rotatably mounted on the chassis (13) with a support shaft (60), and a drive lever (6) is provided at one end of the lever. The cam follower (61) is engaged with the spiral cam groove (33) formed on the back surface of the third gear (3), and the pin (62) provided at the other end of the lever is connected to the relay drive plate ( 64
) is engaged with the elongated hole (65).

The cam groove (33) of the third gear (3) is shown in Fig. 25 and 2.
As shown in Figure 6, the first cam part (33a) has a constant radius, and the second and third cam parts (33b) have gradually decreasing radii.
(33c), a fourth cam part (33d) in which the radius of the outer peripheral wall of the cam groove increases and the groove width expands from W to X in the figure, and a fifth cam part (35e) with a constant radius. be done.

The first cam part (33a) is connected to the drive lever (
6) and the second and third cam followers (61).
The cam parts (33b) (33c) are connected to the motor lifting mechanism (5).
), and the fifth cam part (35e) engages with the cam follower (61) during pick-up transfer.

In the tray loading shown in FIGS. 2 to 4, the cam follower (61) of the drive lever (6)
) is engaged with the first cam portion (33a) of the third gear (
3) rotates, the drive lever (6) does not rotate and remains stopped at the clockwise rotation end. Therefore, the two slide drive plates (55) are installed at the front (left side in the figure) moving end, and the turntable (50) is held at the lowering end.

Thereafter, when the third gear (3) is further driven counterclockwise, the cam follower (61) of the drive lever (6) moves into the cam groove (33) of the third gear (3) as shown in FIG. Driven by the second cam portion (33b), the drive lever (6) rotates counterclockwise. This allows the slide drive plate (
55) is driven rearward, and within the operating range of the second cam portion (33b), the turntable (50) rises from the position shown in FIG. 7 to the position shown in FIG. 8.

Further, the third gear (3) is driven counterclockwise, and the third cam portion (33c) of the cam groove (33) operates, so that the relay drive plate (64) is moved to the rearward movement end in FIG. At the same time, the turntable (50) rises from the position shown in FIG. 8 to the position shown in FIG. 9, and disk clamping is performed.

Disk Clamp (7) The disk clamp mechanism (7) mainly obtains clamping force by magnetic force, and as shown in Fig.
13) It is attached to a metal support member (71) fixed above, and the support member (71) constitutes a flat plate-like yoke.

As shown in FIG. 14, the disk clamp mechanism (7)
A disc-shaped clamper (70) and a ring-shaped permanent magnet (
74) and a holder (75) that holds the magnet (74).
and a plate spring (76) that is supported cantilevered by a cut-and-raise stand (77) formed on the support member (71), and is fixed to a holder (75) above with the support member (71) in between. A clamper (70) is provided below the magnet (74), and the clamper (70) is integrated with a holder (75) holding the magnet (74). Support member (
A central hole (72) is provided in the support member (71), through which the shaft (70a) of the clamper (70) passes with ample space, and a seat (72) is provided on the upper surface of the support member (71) to receive the magnet (74). 73) are provided at multiple locations. Leaf spring (7
6) The free end extends horizontally to a position above the center of the central hole (72), and as shown in FIG. It is formed.

Therefore, when the turntable (50) is lowered as shown in FIG. 7, the magnetic attraction between the magnet (74) and the support member (71) causes the magnet (74) to 73), the clamper (70) is installed at the lower end at the maximum distance from the support member (71).

In addition, the lower pressure part (78) of the leaf spring (76) is connected to the clamper (7
0) is far from the head.

Thereafter, as shown in FIGS. 8 to 9, after tray loading is completed, the clamper (70) is pushed up by the disk (120) on the turntable (50) while the turntable (50) is rising. When the turntable (50) reaches the rising end as shown in FIG. ) A certain magnetic gap G is formed between the two. At this time, the turntable (50Ll two disks (120) has a thickness of 12mm,
Compact disc with a diameter of 12 cm or a thickness of 1.2 cm
In the case of a small diameter laser disk with a diameter of 20 cm, there is a slight gap between the head of the clamper (70) and the leaf spring (76), but the thickness is 2.5 mm.

In the case of a large diameter laser disk with a diameter of 30 cm, the head of the clamper (70) pushes up the lower pressure portion (78) of the leaf spring (76) as shown in the figure, causing the leaf spring (76) to elastically deform.

As a result, in the case of a compact disc or a small diameter laser disc, the magnetic attraction between the magnet (74) and the support member (71), and in the case of a large diameter laser disc with a diameter of 30 cm, the force of the leaf spring (76) is further increased. With the addition of elastic force,
The clamper (70) is pressed down toward the turntable (50), and the disc (120) is pressed down toward the turntable (50).
) and the clamper (70) to complete the disk clamping process.

FIG. 16 shows the relationship between the magnetic gap and the clamping force in the disk clamping mechanism described above. As shown by the solid line, when the gap is less than 3.1 mm, the clamping force due only to the magnetic attraction force acts; If it is .1 mm or more, a clamping force is applied, which is a combination of magnetic attraction force and spring force. When the disk is not clamped, a gap of 1.2 mm is formed depending on the thickness of the seat (73), and the clamping force (magnetic attraction force) at that time is 2.16 K.
It is g. Thickness 1.2 in disc clamp state
In the case of a mm disc (point P,), the gear knob is 2,
5 mm, the clamping force is 1.08 kg, and the thickness is 2.
In the case of a 5 mm disc (point P), the gear lug is 3.7 mm and the clamping force is 0.83 kg.

According to the disk clamp mechanism (7), the magnetic gap G
Since the size of the magnet (74) can be freely designed even if the values are slightly different, a sufficient lamp force can be obtained regardless of the thickness of the disk.

In addition, especially in the case of a large diameter laser disk, when the disk starts rotating, an inertial force acts as a load, but since the spring force is applied as a clamping force as described above, the turntable (50) will not spin idly. do not have.

Note that the clamp release operation after signal reproduction, that is, the lowering operation of the turntable (50), is performed by rotating the third gear (3) clockwise.

By the way, in the disk clamping mechanism (7), when the supporting member (71) is formed from a thin plate, the central portion of the supporting member (71) is slightly moved upward by the magnetic attraction force in the disk clamped state shown in FIG. It is lifted up and elastically deforms into an arch shape. When the amount of elastic deformation becomes large, the seat (73) on the support member (71) comes into contact with the magnet (74), which impedes the rotation of the tartemple (50) and the clamper (70).

Therefore, in this embodiment, as shown in FIGS. 14 and 15, the center portion of the support member (71) is depressed downward by press working to form a stepped portion (71a). Step part (
The step 71a) is set to approximately 0.3 mm depending on the amount of elastic deformation caused by the magnetic attraction force.

Therefore, even if the supporting member (71) is slightly elastically deformed into an arch shape due to the magnetic attraction force, the seat (73) is
It never hits.

The reason why only the center part of the support member (71) is not set at a low position is to prevent the outer periphery of the disc from hitting the support member (71) due to surface runout when the disc rotates. This is to do so.

Pickup Device (9) As shown in FIG. 1, on one side of the turntable (50), a guide shaft (92) is installed on the chassis (13) and extends in the direction in which the tray comes out and goes out. Pickup (90
) etc., the end of the slide base (91) on the drive gear mechanism (2) side slidably engages with the guide shaft (92), and the opposite end engages with the chassis (1).
3) is slidably mounted thereon, whereby the pickup (90) reciprocates precisely along the radial line of the turntable (50).

As shown in FIG. 27, a pickup (90) is directly fixed on a rotating base (93) on a slide base (91).
) is provided, and a pair of pivots (95) protruding outward on both sides of the rotating base (93) are pivotally supported on the slide base (91), so that the rotating base (93) It is rotatably supported within a certain angular range in the vertical direction.

Further, the rotation base (93) is biased downward by a spring (96) interposed between the rotation base (93) and the slide base (91).

The pickup device (9) includes a tilt mechanism (for adjusting the inclination of the optical axis of the pickup (90) during signal reproduction.
100) is equipped. The tilt mechanism (100) rotates the pickup (90) downward together with the rotation base (93) to avoid interference between the tray (44) and the pickup (90) during tray loading as shown in FIG. It also serves as a pickup evacuation mechanism.

The tilt mechanism (100) has a rotating base (
93) a pin (94) protruding rearward from the end;
A cam member (103) having a spiral cam surface (104) with which the pin (94) slides, a gear mechanism (102) that rotationally drives the cam member (103), and a gear mechanism (102) that rotationally drives the cam member (103).
2) and a motor (101) that serves as a power source.

Therefore, the cam member (1) is driven by the motor (101).
03) in the forward and reverse directions, the pin (94) slides along the cam surface (104), and the rotating base (93)
is driven up and down.

The cam surface (104) has a steep first slope (1) as shown in FIGS. 28(a)(b) and 29(a)(b).
04a) and a second slope (104b) with a gentle slope, and in the process of the pin (94) sliding on the first slope (104a), it reaches the descending end as shown in FIGS. 28(a) and (b). A certain rotating base (93) is rapidly raised, and through the subsequent movement of the second slope (104b), the rotating base (93) is brought to a horizontal position as shown in FIGS. 29(a) and (b). It is. At the time of signal recording and reproduction, which will be described later, as shown in FIG. 29 (
The second slope (104
The operation b) performs the original tilt adjustment operation.

On the chassis (13), as shown in FIGS. 28(a) and 28(b), there is a first photo sensor (106) for detecting the state in which the pickup (90) is installed at the lower end, and a second photo sensor (29).
A second photo sensor (
107) is attached, and the slide base (
The photo sensor (106) (10
A reflecting plate (105) is provided to reflect the light from 7).

Figure 30 shows the mounting structure of the reflector (105), in which the resin heel (108) integrally equipped with the cam member (103) rotatably engages with the slide base (91). A metal reflector (1
05) or screws (109). The tip of the reflecting plate (105) is expanded into a fan shape as shown in FIG. 28(a), and the expanded portion faces the position of the photosensor (106) or (107).

Rotating base from Fig. 28(b) to Fig. 29(b) (
The rotation angle of 93) is approximately 8 degrees, and the variation in the tilt angle during the original tilt adjustment operation is ±2.5 degrees.

Due to the operation of the tilt mechanism (100), the pickup (9) is moved during tray loading as shown in FIGS.
0) is installed at the lower end, and after loading is completed as shown in Figure 9, the pickup (90) is placed on the turntable (50).
) to a height position having a predetermined distance from the disk (120) above.

Therefore, even in a disc player where only the turntable (50) and spindle motor (51) are raised and lowered and the pickup device (9) is installed on the chassis (13) as described above, the disc (120) and the pickup during signal reproduction can be used. (90), i.e. pickup (90)
This allows the focal length of the optical system to be set to an appropriate value.

When unloading the disc, the pickup (
90) descends and picks up the pickup (90) and tray (4).
4) is avoided.

Next, the pickup (90) on the slide base (91).
) will be described below.

A rack (98) extending in the sliding direction is integrally attached to the slide base (91), and the pinion portion (26) of the second gear (24) is attached to the rack (98).
) and the pinion portion (39) of the sixth gear (37) mesh with each other to reciprocate the slide base (91).

When the third gear (3) is further rotationally driven in the counterclockwise direction from the disc clamping completed state shown in FIGS. 5 and 20, the main gear portion of the third gear (3) ( 31
) is separated from the sixth gear (37), and the main gear part (31) of the third gear (3) and the sixth gear (37
) starts to mesh with the gear part (38).

As a result, the sixth gear (37) rotates clockwise as shown in FIG. 21, and the pinion portion (39) of the sixth gear (37)
) is fixed to the slide base (91) (98)
begins to drive to the left. As a result, Figures 22 and 11
As shown in Figures (a) and (b), the rack (98)
At the same time as it meshes with the gear (37), it also meshes with the pinion part (26) of the second gear (24), and the power of the loading motor (21) is transmitted to the rack (98) via the second gear (24). The first path leading to the second gear (24)
, the rack (via the third gear (3) and the sixth gear (37)
The power is transmitted to the slide base (91) through two power transmission paths, the second path leading to the slide base (98).

The first power transmission path includes a loading motor (21
) and the rack (98), there are only two gears, the first gear (23) and the second gear (24), so there is a difference between the gears compared to the second power transmission path. There is little hacklash, and therefore the movement of the pickup (90) can be accurately controlled during signal reproduction.

By the way, in the above configuration, if all the teeth of the rack (98) are formed into a standard tooth profile,
In the process of transitioning to the state shown in the figure, when the rack (98) starts to mesh with the pinion part (26) of the second gear (24),
Unreasonable force may act between the rack (98) and the pinion portion (26).

The cause of this is the backlash between the pinion section (39) of the sixth gear (37) and the rack (98). That is, if there is no backlash between the two, then Figure 35 (
As shown in d), the clockwise rotation of the pinion part (26) of the second gear (24) and the movement of the rack (98) approaching the second gear (24) are completely synchronized, and the phase difference is Since this does not occur, the leading rack tooth (98d) is connected to the pinion part (26
) to smoothly intervene between the teeth (26a) and (26b) of the second gear (24) and the pinion part (26) of the second gear (24) and the rack (
98) starts to engage. However, the 6th gear (37
) It is inevitable that a certain amount of backlash will occur between the pinion part (39) and the rack (98).
The movement of the rack (98) is delayed by the amount of backlash compared to when there is no backlash.

As a result, the phase relationship between the second gear (24) and the rack (98) is disrupted.

Fig. 35(a) shows the 35th case when there is backlash.
The state corresponding to figure (d) is shown, and the rack (98)
Due to the delay, the leading rack tooth (98d) and the second gear (
24) and the teeth (26b) of the pinion portion (26) are in contact with each other at an abnormal meshing position. Furthermore, as shown in FIG. 35(b),
As the second gear (24) and the sixth gear (37) rotate, the rack teeth (98d) and pinion teeth (26b) push against each other, generating large repulsive forces R and R'.

Furthermore, as the rotation of the second gear (24) and the sixth gear (37) progresses as shown in FIG. 35(c), the leading rack tooth (
98d) may forcefully intervene between pinion teeth (26a) and (26b), or the tooth surface may be damaged by the repulsive force generated in the state shown in Fig. 37(b), or
Problems such as noise generation occur during the transition from state ) to state (c).

Therefore, as shown in FIG. 33, the leading rack tooth (98a) of the rack (98) is changed from the standard tooth profile shown by the chain line to the second rank tooth (
The tooth profile on the side 98c) is formed into a sawtooth shape with a part thereof missing, and a flat relief surface (98b) is provided on the surface facing the second rack tooth (98c). For example, the subsequent rack teeth (
98c) module or 05, pitch P is 1.57mm
, the pinion part (39) of the sixth gear (37) and the rack (9
8), if the backlash with
The horizontal distance S to the midpoint with c) is set to approximately 10 mm. Note that the distance T from the midpoint to the tip of the subsequent rack tooth (98C) is 0.57 mm.

Therefore, in the state of FIG. 34(a) corresponding to FIG. 35(a), the leading rack tooth (98a) of the rack (98)
flank (98b) and the pinion tooth (24) of the second gear (24).
26b), and then as the second gear (24) and sixth gear (37) rotate, the flank (98b) of the leading rack tooth (98a) and the pinion rotate as shown in FIG. 34(b). When the teeth (26b) come into contact with each other, both tooth surfaces mesh deeply with each other, and no unreasonable force is applied between the two tooth surfaces.

As the rotation of the second gear (24) and the sixth gear (37) further progresses, the pinion tooth (26b) pushes the leading rack tooth (98a) as shown in FIG. 34(C), and the second gear (24) and the rack (98) are restored.

After that, as shown in Fig. 34(d), the next pinion tooth (26C
) comes into contact with the second rack tooth (98c), and the state of normal engagement between the tooth surfaces and the maggots shifts to normal.

Furthermore, the pickup device (9) has a cam groove (33) of the third gear (3) and a drive lever (6) when the pickup is transferred.
A side pressure release mechanism is provided to release the pressure contact state with the cam follower (61).

In the state where the disk clamping is completed as shown in FIG. 20, the drive lever (6) is biased to rotate clockwise due to the repulsive force of the spring (59). Therefore, since the cam follower (61) of the drive lever (6) is pressed against the outer peripheral wall of the cam groove (33) of the third gear (3), the third gear (3) cannot be driven in this state. When performing pickup transfer, the frictional force between the cam follower (61) and the wall surface of the cam groove (33) is added as a load, and if this load varies depending on the device assembly state, it is difficult to accurately control the pickup transfer. become unable to do so.

Therefore, a claw piece (63) is formed on the drive lever (6), and an L-shaped side pressure plate is provided on the chassis (13) that has a hook part (81) that can be engaged with the claw piece (63). The release lever (8) is rotatably supported by a support shaft (82) on the chassis (13), and
It is biased clockwise by a spring (84) stretched between.

As shown in FIGS. 17 and 18, the lateral pressure release lever (8) has a shaft in the vicinity of the support shaft (82) from the end surface opposite to the hook portion (81) in a direction perpendicular to the longitudinal direction of the lever. A projecting piece (83) is also formed.

On the other hand, on the back side of the slide base (91) constituting the pickup device (9), there is a downward protrusion (99) that can come into contact with the protrusion (83) of the lateral pressure release lever (8), as shown in Fig. 23. It is formed.

As shown in FIG. 20, when the drive lever (6) is at the counterclockwise rotation end and the slide base (91) is installed at the right end of movement, the protrusion ( 99) presses the protrusion (83) of the lateral pressure release lever (8), and the lateral pressure release lever (8) is held at the counterclockwise rotation end against the spring (84).

Therefore, the claw piece (63) of the drive lever (6) and the hook part (81) of the side pressure release lever (8) are separated.

Thereafter, as shown in FIG. 21, the third gear (3) rotates slightly counterclockwise and the slide base (91) moves to the left due to the drive of the sixth gear (37).
As the lateral pressure release lever (8) moves clockwise, the hook portion (81) of the lever moves toward the claw piece (63) of the drive lever (6). Also, the drive lever (6)
The cam follower (61) has a cam groove (61) shown in FIG.
33) from the third cam part (33c) to the fourth cam part (33d
). The fourth cam part (33d) is
Since the groove width increases in the outer circumferential direction from W to X, the drive lever (6) moves from the position shown in FIG. 20 to the position shown in FIG. Rotate slightly clockwise to the position shown in Figure 21. As a result, the claw piece (63) of the drive lever (6) and the hook part (81) of the side pressure release lever (8) reach a state just before engagement as shown in FIG. 21.

Thereafter, when the third gear (3) further rotates counterclockwise and the slide base (91) moves to the left, the lateral pressure release lever (8) further rotates clockwise, causing the second
As shown in the figures and FIG. 24, the hook part (81) of the lever completely engages with the claw piece (63) of the drive lever (6),
By this engagement, the clockwise rotation biasing force of the spring (59) acting on the drive lever (6) is stopped, and the drive lever (6) can no longer rotate clockwise, but stops.

At the same time, the cam follower (
61) is the fourth cam portion (33) of the cam groove (33) shown in FIG.
33) to the fifth cam portion (33), which is the width of the groove,
Along with this transition, the cam follower (61) moves into the cam groove (33
), and the side pressure exerted on the cam follower (61) or the wall surface of the cam groove (33) is released. As a result, the third gear (3) does not receive any resistance from the cam follower (61) of the drive lever (6), and the second gear (3)
24) and the sixth gear (37).

As shown in FIG. 6, during the process of reciprocating the pickup (90) between the outer circumference and the inner circumference of the disk, that is, during signal reproduction, the drive lever (6) remains locked in the pressure measurement release state. , without rotating, the lever (6
The cam follower (61) of ) relatively moves within the fifth cam portion (33e) of the cam groove (33) shown in FIG. 25 without contacting the inner peripheral wall and the outer peripheral wall.

The disengagement operation between the claw piece (63) of the drive lever (6) and the hook part (81) of the lateral pressure release lever (8) after the signal is regenerated is performed by rotating the third gear (3) clockwise. Then, the slide base (91) is moved toward the moving end on the outer circumferential side of the disk, and the lateral pressure release lever (8) is rotated counterclockwise by the convex portion (99) of the slide base (91). The fourth cam portion (of the cam groove (33) of the third gear (3)
33d) by slightly rotating the drive lever (6) counterclockwise (see FIG. 21).

Pickup lock 1 When transporting a completed disc player as a product, such as shipping from the factory, the tray (44) is stored in the cabinet (1) as shown in Figure 4, and the pickup device (9) is removed from the turntable (50) to the maximum extent possible. It is set whether it is installed at a separate moving end. In this state, if an impact force is applied to the pickup device (9) due to transportation, it is necessary to reliably lock the pink-up device (9) at the moving end.

Therefore, as shown in Fig. 23, the claw piece (63) of the drive lever (6)
) is protrudingly provided near the stopper (68), while the side pressure release lever (8) has a hook portion (81) as shown in Fig. 17.
The lever end (
87), and a contact surface (86) that can come into contact with the stopper (68) is formed on the end surface of the lever one end (87). Further, the side pressure release lever (8) has the first
A second protrusion (85) that is slightly shorter than the protrusion (83) of
The first protruding piece (83) is spaced apart from the first protruding piece (83) and protrudes in the same direction as the first protruding piece (83). The first protruding piece (83) and the second protruding piece (85)
As shown in FIG. 23, a convex portion (99) can be inserted between the two with a slight margin.

In the state shown in FIGS. 2 to 4, the protrusion (99) of the pickup device (9) is interposed between the first protrusion (83) and the second protrusion (85) of the lateral pressure release lever (8). At the same time, the lateral pressure release lever (8) is either the contact surface (86) or the drive lever (6).
The posture is defined by the stroke bar (68).

Therefore, in the transportation settings shown in FIGS. 4 and 23, the turntable (5) is attached to the pickup device (9).
Even if an impact force is applied to the 0) side, the impact force will not be received by hitting the protrusion (99) of the slide base (91) or the second protrusion (85) of the side pressure release lever (8). It will be done. Further, the force acting on the lateral pressure release lever (8) of the convex portion (99) is not received when the contact surface (86) of the lateral pressure release lever (8) hits the stopper (68) of the drive lever (6). It can be stopped. At this time, since the cam follower (61) is engaged with the cam groove (33) of the third gear (3), the drive lever (6) is rotated by the acting force from the contact surface (86). Never.

Therefore, the pickup device (9) is reliably locked in the position shown in FIG.

In the process of transitioning from the state shown in FIG. 4 to the state shown in FIG. 5 for disk loading, the drive lever (6) rotates counterclockwise, causing the stopper (68) to move as shown in FIG. Contact surface (86) of lateral pressure release lever (8)
depart from. Along with this, the side pressure release lever (8) is slightly rotated clockwise by the bias of the spring (84), and the first projecting piece (83) is brought into contact with the convex part (99) of the pickup device (9). Hit it and stop.

Thereafter, as shown in FIG. 21, in the process of the slide base (91) slightly moving toward the turntable (50), the protrusion (
99), the lateral pressure release lever (8) further rotates clockwise, and the second projecting piece (85) sufficiently separates from the protrusion (99) to release the restraint of the slide base (91). .

Then, with the hook portion (81) of the lateral pressure release lever (8) and the claw piece (63) of the drive lever (6) fully engaged as shown in Fig. 22, the slide base (91) is further moved onto the turntable. By driving toward the (50) side, the convex portion (9
9) will be removed from the side pressure release lever (8).

In addition, in the process of ejecting the disc after signal reproduction, the convex part (99) is moved to the side pressure release lever (
8), press the first projecting piece (83) and release the side pressure release lever (8).
) counterclockwise against the spring (84). Thereafter, in the process of lowering the turntable (50) as shown in Fig. 4, the stopper (68) of the drive lever (6)
) comes into contact with the abutting surface (86) of the lateral pressure release lever (8) again to regulate the attitude of the lateral pressure release lever (8) and set the pickup (90) in the locked state.

The chassis (13) is connected to the cabinet (13) as shown in Figure 36.
) A plurality of columns (14) protruding from the base (12) at the bottom.
), and a buffer member (15) made of an elastic material such as rubber is interposed between the head of the support column (I4) and the chassis (13).

Therefore, even if an excitation force acts on the base (12) due to the operation of each of the above-mentioned mechanisms, the excitation force will not be applied to the buffer member (12).
5), and vibrations that would interfere with signal reproduction by the pickup (90) do not occur.

Such a vibration suppression structure is realized by arranging all mechanisms such as the driving gear mechanism (2), the tray drive mechanism (4), the disk clamp mechanism (7), and the pickup device (9) on the fixed chassis (13). It's ours.

The above description of the embodiments is for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims.

Further, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the overall configuration of a disc player according to the present invention, FIGS. 2 to 6 are plan views showing a series of operations from a tray eject state to a signal reproducing state, and FIGS. 7 to 7. FIG. 9 is a series of partially cutaway side views showing the operation of the motor lift mechanism, disk clamp mechanism, and tilt mechanism; FIGS. 10 and 11 are explanatory diagrams showing the shape and meshing state of each gear of the drive gear mechanism; Figure 12 is an exploded perspective view of the motor lifting mechanism, Figure 13 is a side view of the slide drive plate,
Figure 14 is an exploded perspective view of the disc clamp mechanism;
The figure is a sectional view of the support member and leaf spring that constitute the disk clamp mechanism, FIG. 16 is a graph showing the relationship between the magnetic gap and clamping force in the disk clamp mechanism, and FIG.
The figure and FIG. 18 are a plan view and a side view of the side pressure release lever,
19 to 22 are a series of plan views showing the operation of the drive lever and the side pressure release lever, FIG. 23 is an enlarged plan view showing the pickup in the locked state, and FIG. 24 corresponds to FIG. 23 in the pickup transfer state. A plan view, FIG. 25 is a back view of the third gear, FIG. 26 is a diagram showing the cam curve, FIG. 27 is a perspective view of the pickup device, and FIGS. 28(a) and 29
Figure (a) is a plan view showing the operation of the tilt mechanism.
Figures (b) and 29(b) are side views corresponding to Figures 28(a) and 29(a), respectively, Figure 30 is an enlarged sectional view showing the state in which the reflector is installed, and Figure 31 32 and 32 are partially cutaway pressure surface views showing a mechanism for preventing meshing and disengagement between the rack and pinion part of the tray drive mechanism, FIG. 33 is an enlarged plan view showing the tooth profile of the rack constituting the pickup transfer mechanism, and FIG. 34
Figures (a) to (d) are a series of plan views showing the operation of starting meshing of the rack and pinion that constitute the pickup transfer mechanism;
35(a) to 35(c) are a series of plan views showing the start of meshing between the rack and pinion as in boat fishing, and FIG. 35(d) shows the starting state of anastomosis between the rack and pinion when there is no backlash. FIG. 36 is a partially cutaway side view showing the elastic support structure of the chassis. (1) Cabinet (2) Drive gear mechanism (4) Tray drive mechanism (5) Motor lifting mechanism (51) Spindle motor (61) Cam follower ( 7)...Disc clamp mechanism (70)...Clamper (74)...Magnet (
8)...Side pressure release lever (9)...Pickup device (13)...Chassis (33)...Cam groove (44)...Tray (50)...Turntable (6) ... Drive lever gap (gap) Fig. 16 6θ Fig. 29 (b) Fig. 8a (b) Broom: aFA;! J, No/ Figure 86 Procedural Amendment (Voluntary) May 14, 1991 1゜ Indication of Case Patent Application No. 1999 2. Name of Invention Disk Player Tray Mechanism 3゜ Person Who Makes Amendment Relationship with Case

Claims (1)

[Claims] (1) A tray (44) on which a disk is to be placed, a disk ejection position where the tray (44) is ejected from the front panel opening (11) of the cabinet (1), and a disk storage position in the cabinet (1). In between the trays (4
4) and a guide mechanism that guides the reciprocating movement of the tray (44).
) along the guide mechanism, the drive mechanism includes a rack (45) provided on the back surface of the tray (44) along the tray movement direction, and a motor (21).
) and a pinion (43) which is rotationally driven by a pinion (43) and meshes with the rack (45).The tray mechanism of the disc player includes a pinion (43) that is rotationally driven by a pinion (43) and meshes with the rack (45). (47) protrudes from at least the end on the disc storage position side, and the tray (44
), the side surface of the rib (47) on the rack (45) side connects to the shaft (48) that stands up on the fixed chassis (13) and supports the pinion (43).
A tray mechanism for a disc player that is in sliding contact with the head of the disc player or is opposed to the head of the disc player with a slight interval therebetween.