JPH0622058B2 - Double-sided disc playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a pickup transfer mechanism of a disc double-sided reproducing apparatus for reproducing information from a disc on which information is recorded on both front and back sides by a single pickup. Regarding

(B) Conventional technology When playing a disc with information recorded on both sides with a conventional compact disc player or optical video disc player, remove the disc when the information on one side is completed and turn it over. After that, the other side had to be regenerated. However, this is extremely troublesome in operation, and continuous reproduction on both sides is impossible.

Also, in the case of a player of a type in which a record board having a groove is reproduced by a reproducing needle instead of an optical type, for example, Japanese Patent Laid-Open No. 56-7
As disclosed in Japanese Patent Publication No. 7948 (G11B17 / 08), a technique has been proposed which enables double-sided reproduction of a record by a single signal reading means.

In this conventional technique, a guide rail is provided which is composed of a pair of linear guide portions that are arranged in parallel to each surface of the record and are arranged to face each other, and a U-shaped guide portion that connects the two guide portions. The tone arm is fixed to the movable base that moves on this guide rail, and each side of the record is reproduced while moving each linear guide, and when changing the reproduced surface, the U-shaped guide is attached to the movable base. It is configured to move from one surface to the other surface via.

A plurality of rollers are pivotally supported by the movable base, the rail is sandwiched between at least two of these rollers, and in this state, a driving force is applied to the movable base so that the rollers roll on the rail. Since it has an extremely simple structure that allows it to move along the guide rail of the movable base, when the movable base moves on the guide rail, some rattling occurs in the direction orthogonal to the moving direction. In this case, some rattling is not a problem. That is, the above-mentioned conventional technique is intended for a record player that traces a groove of a record board with a reproducing needle. Since the reproducing needle is supported by a tone arm through a cantilever, each surface of the record board is When playing, even if there is some rattling in the movement of the movable base on the linear guide,
Because it can be sufficiently absorbed by the tone arm and cantilever.

However, in the optical disc player that reproduces information in a non-contact manner with respect to the disc, the position control in the focus direction and the tracking direction of the pickup, which is a signal reading means with respect to the disc, requires much higher accuracy than the needle type player described above. Become.

Therefore, when the above-mentioned conventional technique is applied to this optical disc player, if slight shakiness occurs during movement of the movable base on the linear guide portion, a heavy load is always applied to the focus servo and the spindle servo, and the servo control is not performed. There is an extremely high risk of the worst case in which the signal cannot be read beyond the allowable range.

Therefore, the guide mechanism disclosed in P70 of the document "Laser Disc Technical Book" published by Ascii Corporation is widely used for ordinary single-sided reproduction optical disc players. By applying it to the device, it becomes possible to prevent rattling when the diameter of the pickup moves.

Here, the guide mechanism forms a fitting hole that extends in the linear movement direction in a movable base that supports the pickup, and fixes a guide pole that extends in the linear movement direction on the chassis side and that fits in the fitting hole. However, this is a mechanism that prevents rattling when the movable base is linearly moved by fitting them together.When applied to a double-sided playback device, a pair of upper and lower guide poles are provided in parallel with the pair of upper and lower linear guides, respectively. By disposing the movable base on each linear guide part, by fitting each guide pole into the fitting hole, the play of any surface of the disc can be minimized. It becomes feasible.

(C) Problems to be Solved by the Invention As described above, when performing the double-sided reproduction with the guide poles to prevent rattling, the movable base moves on the U-shaped connecting portion that connects both linear guide portions. When you do
The fitting state between the one-end fitting hole and the guide pole is released, and for example, when moving from the lower linear guide portion to the upper linear guide portion, the fitting hole is fitted with the lower guide pole. Is completed, and after the connecting portion is moved, the upper guide pole is newly fitted. However, while the movable base moves through the connecting portion, there is no rattling between the fitting hole and any of the guide poles. In the above, the guide pole does not fit into the fitting hole due to the rattling, and in the worst case, the guide pole comes into contact with the side surface near the fitting hole of the movable base to affect the movement of the movable base. . It is also possible to reduce the diameter of the guide pole itself in order to smoothly start the fitting, but at this time the gap between the guide pole and the fitting hole at the time of fitting becomes large, and the rattling prevention effect itself is obtained. To be weak.

(D) Means for Solving the Problems The present invention is characterized in that a position where a fitting hole and a guide pole start fitting, that is, a tip portion of both guide poles has a tapered shape in which the diameter gradually decreases. To do.

(E) Operation Since the present invention is configured as described above, it is possible to smoothly shift the guide pole and the fitting hole to the fitted state while maintaining the rattling prevention effect.

(F) Embodiment FIG. 1 to FIG. 29 show an optical disc reproducing apparatus equipped with a pickup transfer device according to the present invention.

First, the outline of the video disc reproducing apparatus will be described.

As shown in FIG. 2, a rotation driving device for an optical disk (10) is provided inside a cabinet (1) formed in a flat rectangular parallelepiped shape.
A pickup device (3) which is provided with (2) and faces the device and constitutes the pickup transfer device of the present invention.
And a guide mechanism (5), and further equipped with a circuit board (9) on which electric circuits such as a control circuit, a tracking control circuit, and an image signal processing circuit of these devices are formed. or,
The disc tray (71) on which the optical disc (10) is to be placed is provided so as to be retractable in the opening (12) provided in the Teflon panel (14), and a disc ejection position where the disc can be placed and taken out, It is reciprocally driven by a loading mechanism which will be described later between a disc storage position above the disc drive device (2).

A main chassis (13) shown in FIG. 16 is disposed inside the cabinet (1), and a sub-chassis (14) shown in FIG. 17 is fixed to a substantially central portion of the main chassis (13). .

As shown in FIG. 1, a disk drive device (2) including a spindle motor (21) and a turntable (22) is attached to the subchassis (14), and a pickup device (2) is attached to the drive device (2). 3) and a guide mechanism (5) are provided.

The pick-up device (3) has a pick-up (31) composed of an optical system including a semiconductor laser and an objective lens at a substantially central portion of a support base (30).

As is well known, in a video disc reproducing apparatus, the optical axis of the pickup (31) is made to jump to the inner or outer peripheral side of the disc during the vertical blanking period of the reproduced video signal to reproduce a still image or a double speed. Etc. special reproduction is performed. This jump operation can be achieved by using various known means such as an electromagnetic drive system in which a permanent magnet is arranged in a movable part including an objective lens and the magnet is driven by a drive coil. When the signal reading beam is swung to jump the tracks to be reproduced by a predetermined number of tracks, a control signal having a magnitude corresponding to the predetermined number of track widths is sent to the jump control circuit connected to the drive coil.

The pickup device (3) comprises a gear mechanism arranged on both sides of the support base (30) and a feed motor for driving the gear mechanism.
It is equipped with a self-propelled mechanism (4) consisting of (40).

The guide mechanism (5) includes left and right guide rails (51) and (52) each formed in a U shape. Both guide rails (51) (52)
Are fixed on the sub-chassis (14) so that they are parallel to each other as shown in FIGS. 2 and 5, and each guide rail is parallel to the disk radius line D extending in the disk tray movement direction. .

Each of the guide rails (51) and (52) has a downward linear movement guide portion A extending horizontally below the disc (10) set on the turntable (22) as shown in FIG. 7, and the disc (10). An upper linear movement guide portion B extending horizontally above the two guide portions A,
And an arcuate guide portion C connecting B. Accordingly, the pickup device (3) reproduces the back surface of the disc (10) while being guided by the downward linear movement guide portion A, and then is reversed by passing through the arc-shaped guide portion C and is inverted to the upper surface side of the disc (10). It is possible to reproduce the disk surface while being moved to and being guided by the upper straight guide portion B.

In order to fix the upper straight guide portion B at a predetermined position,
As shown in FIG. 6, a top chassis (17) is fixed on both guide rails (51) and (52), and the ends of the top chassis (17) are supported on the main chassis (13). Frame (18)
Fixed to.

In order to guide the linear movement of the pickup device (3) more accurately, the linear movement of the guide rail onto the top chassis (17) and the subchassis (14) is performed as shown in FIGS. 1, 6, and 18. An upper guide pole (6) and a lower guide pole (61) are supported in parallel with the guide portion. On the other hand, as shown in FIG. 12, the support base (30) of the pickup device (3) has a slide groove with an arc-shaped cross section through which a guide pole can penetrate.
(35) is recessed. When the pickup device (3) reproduces a signal, the slide groove (35) slides on the peripheral surfaces of the guide poles (6) and (61), which prevents rattling during linear movement and improves tracking accuracy. Is planned.

Load an optical disc in the video disc playback device,
The operation when performing signal reproduction will be described with reference to FIGS. 28 (a) to 28 (d).

After placing the disc (10) on the disc tray (71) ejected from the cabinet (1) as shown in FIG. 28 (a), the disc tray (71) is moved into the cabinet by driving a loading mechanism described later. It is housed (Fig. 28 (b)). As a result,
The disc tray (71) enters the space at the center of the guide mechanism (5), and the disc (10) is the disc drive device in the cabinet.
Move to the disk storage position on the rotation axis of (2). next,
The disk tray (7
1) is lowered, and thereby the disk (10) is set to the disk device position on the turntable (22) of the disk drive device (2) (Fig. 28 (c)). After that, the disc drive device (2) rotates the disc (10) at a high speed, and the feed motor (40) drives the pickup device (3) to reciprocate to reproduce the disc (10) ( FIG. 28 (d)).

Next, the configuration of each part of the video disc reproducing apparatus will be described in detail.

The support base (30) of the pickup device (3) comprises a sub base (34) having a pickup (31) mounted on a main base (33) provided with a self-propelled mechanism (4) as shown in FIG. Deployed and configured.

As shown in FIGS. 3 and 4, the self-propelled mechanism (4) is provided with a left gear mechanism which is provided on the left guide rail (51) side of the main base (33) and driven by a feed motor (40). It is composed of a left gear mechanism arranged on the right guide rail (52) side and a right gear mechanism connected via a connecting shaft (47). The left gear mechanism is the first to fifth gears (41) (42) (43) (44) (45) and the left drive gear.
(46), the rotation of the feed motor (40) is from the first gear (41) fixed to the motor shaft to the large gear portion of the second gear (42).
(42a), the small gear part (42b), the large gear part (43) of the third gear (43)
a), the small gear part (43b), the large gear part (44a) of the fourth gear (44), the small gear part (44b), and the large gear part (45a) of the fifth gear (45), the small gear part ( It is transmitted to the left drive gear (46) via 45b). The right gear mechanism is a right drive gear that meshes with a sixth gear (48) integrated with the fifth gear (45) via a connecting shaft (47).
(49) and are included. 5th gear pinion (45b) and 6th
The gear (48) and the left drive gear (46) and the right drive gear (49) are designed to have the same specifications. The left drive gear (46) and the right drive gear (49) have their respective pivots on a line E passing through the center of the pickup (31) and orthogonal to the movement path D of the pickup (31) as shown in FIG. It is provided in accordance with.

As shown in FIG. 3, the left drive gear (46) and the right drive gear (49)
The left roller (140) and the right roller (141) are rotatably attached to the rotation shaft of the above. In addition, the main base (3
In the front of the side wall on the right guide rail (52) side of 3), the right roller (14
The leading roller (104) is pivotally supported at the same height as 1).

As shown in FIG. 10, the sub-base (34) is pivotally supported (13) near the right and left drive gears (49) (46) on the main base (33).
8) (138). The pivot portion is provided on both sides of the sub-base (34) with pins (34a) (34) protruding in parallel with the rotation axis of the drive gear.
As shown in FIG. 11, a) is fitted into the recess of the main base 33, and the pin 34a is pressed down by the leaf spring 139.

The optical axis of the pickup (31) must be maintained perpendicular to the signal surface of the optical disc, but if the disc itself is deformed, the optical axis of the pickup (31) will be corrected to The base (33) is provided with a tilt mechanism (103) for slightly adjusting the posture of the sub base (34) by slightly rotating the sub base (34) around the pin (34a). The tilt mechanism (103) includes a cam body (135) formed integrally with a drive gear (134) pivotally supported on the main base (33), and a cam body (135) protruding from the sub base (34). The cam follower (137) that engages with the spiral cam groove (136) recessed in the
A worm gear (13) that transmits the rotation of 1) to the drive gear (134).
2) etc. gear mechanism (133) and optical sensor (130) that detects the tilt of the sub-base (34) with respect to the signal surface of the optical disk
And an electric circuit (not shown) for converting a detection signal of the sensor into a drive control signal for the motor (131).

As shown in FIG. 12, a slide groove (35) having an arcuate cross section through which the upper guide pole (6) and the lower guide pole (61) slidably pass is formed on the back surface of the pickup device (3). It is provided with a long recess in the moving direction of the pickup device (3). Therefore, when the pickup device (3) moves along the linear movement guide portion of the guide mechanism (5), it is moved into the slide groove as shown in FIG.
(35) is fitted to the lower guide pole (61) or the upper guide pole (6) and guided for horizontal movement, and the pickup (31) can move from the disc (10) to a predetermined height position without rattling. Becomes

The left guide rail (51) and the right guide rail (52) constituting the guide mechanism (5) are each formed in a U-shape as shown in FIGS. 1, 7, 8, and 9. ing.

The left guide rail (51) has a left rack portion (53) with which the left drive gear (46) of the self-propelled mechanism (4) meshes over the entire lengths of the linear movement guide portions A and B and the arc-shaped guide portion C. ) Is formed, and the entire length of the arcuate guide portion C and both linear movement guide portions A and B are formed.
The left roller (14) of the pickup device (3)
A U-shaped left guide groove portion (55) into which 0) is fitted is formed.

On the other hand, on the right guide rail (52), both linear movement guide portions A,
Along the entire length of B and the arcuate guide C, a right guide groove (56) into which the right roller (141) and the leading roller (104) of the self-propelled mechanism (4) fit is formed, and the arcuate guide is formed. A right rack portion (54) with which the right drive gear (49) of the pickup device (3) meshes is formed across the entire length of C and a part of both linear movement guide portions A and B.

The pickup device (3) is conveyed by driving the left drive gear (46) with respect to the left rack part (53) when moving the lower linear movement guide part for signal reproduction. At this time, right roller
(141) and the leading roller (104) are guided by the right guide groove portion (56), and the slide groove (35) is guided by the lower guide pole (6).
1) Slide up. Therefore, the pickup device (3) smoothly reciprocates even when only the left drive gear (46) is driven. Therefore, the pickup (31), as shown in FIG.
The disk (10) moves accurately without deviating from the radial line D.

When the reproduction of the upper surface is completed after the reproduction of the rear surface of the disc (10) is completed, the pickup device (3) comes out from the lower guide pole (61) and the left roller is rotated as shown in FIGS. 8 and 9. At the same time that the (140) fits into the left guide groove (55), the right drive gear (49) meshes with the right rack (54). Therefore, the pickup device (3) is driven by both drive gears with respect to both rack parts (53) (54) while the three rollers (140) (141) (104) are guided by the respective guide groove parts (55) (56). By driving (46) and (49), as shown in FIG. 7, the disk is moved up along the arcuate guide portion C to the upper surface side of the disk and inverted. In this process, the pickup device (3) is not guided by the guide pole,
Since both drive gears (46) and (49) drive the respective rack parts (53) and (54), a reliable raising operation is performed.

By further transporting the inverted pickup device (3) toward the center of the disc, the slide groove (35) fits into the upper guide pole (6) (Fig. 6), the left roller (140) and the right drive gear ( 49) are the left guide groove (55) and the right rack (5) respectively.
Leave 4). Therefore, after that, the pickup device
In (3), while the right roller (141) and the leading roller (104) are guided by the right guide groove portion (56), and the slide groove (35) slides on the upper guide pole (6), the left rack portion Driven by the left drive gear (46) to (53), the disc (1
0) The signal reproduction on the upper surface is performed. Also in this case, the pickup device (3) smoothly reciprocates by the guide of the upper guide pole (6), and the pickup (31) does not come off from the disc radius line.

As shown in FIG. 13, the sub chassis (14) and the top chassis (17) are provided with limit switches (hereinafter SW and SW) that detect when the pickup device (3) reaches the moving end on the inner circumference side of the disc. A lower lead-in SW (98) and an upper lead-in SW (97) are provided respectively. on the other hand,
As shown in FIG. 12, a protrusion (36) for operating the lead-in SWs (97) (98) is formed on the bottom of the pickup device (3).

FIGS. 14 and 15 show the structure for mounting the right guide rail (52) to the sub chassis (14). The right guide rail (52).
Is entirely made of synthetic resin, and both ends of the rack portion (54) are formed on projecting pieces (57) and (58) projecting from the guide rail main body on which the guide groove portion (56) is formed. Hook portions (57a) and (58a) are provided at the tips of the pieces (57) and (58). Also, the protruding piece
(57) The base end of (58) has a notch (57b) on the outer peripheral side of the rack.
(58b) is recessed. Therefore, the protrusions (57) and (58) can be elastically deformed in the opening direction.

Further, positioning pins (59a) and (59b) are provided on the upper end surface and the lower end surface of the linear movement guide portions A and B of the right guide rail (52), respectively.

On the other hand, the top chassis (17) and sub chassis (14)
Small holes (120a) into which the locking holes (102a) (102b) for locking the hook portions (57a) (58a) of the projecting pieces (57) (58) and the positioning pins (59a) (59b) are fitted. ) (120b) is opened at a predetermined position.

As shown in FIG. 15, the right guide rail (52) fits the positioning pins (59a) (59b) into the small holes (120a) (120b), and each chassis (14) (17) by screws (122). ) Fixed to.
Also, elastically deform the protrusions (57) (58) in the opening direction,
Attach the hooks (57a) (58a) to the locking holes (102a) (102b) of each chassis.
Lock to. As a result, both end portions of the right rack portion (54) are held in a state of expanding outward from the pitch circle at the center of the rack.

Therefore, when the pickup device (3) shifts from the linear movement guide portion of the guide rail to the arc-shaped guide portion, the right drive gear (49) starts to mesh with the end portion of the right rack portion (54). At this time, the meshing depth of the tooth surfaces of the right drive gear (49) and the right rack portion (54) is initially shallow and gradually deepens, so the shock at the start of meshing is reduced.

As shown in FIG. 16, the sub chassis (14) is fixed at a predetermined position in the center of the main chassis (13). Left side frame (15) and right side frame (16) are fixed to both sides of the main chassis (13), and both side frames (15) (16)
A support frame (18) is installed at a substantially central position of the upper end portion.
The support frame (18) is fitted to the pins (124) (124) integrally molded at predetermined positions at the upper ends of both side frames (15) (16) to be positioned with respect to the main chassis (13). Both side frames (15) (16) by screws (123) (123)
Fixed to.

Also, the left guide rail (51) fixed on the sub chassis (14)
And the top chassis (17) is fixed on the right guide rail (52) as described above, and the end portion of the top chassis (17) is
Pin (125) integrally molded in place on the instruction frame (18)
Are fitted and positioned with respect to the main chassis (13), and the support frame (18) is fixed by screws (123) (123).
Fixed to.

With the above structure, the left guide rail (51) and the right guide rail (52) can be accurately fixed to the sub chassis (14) at predetermined positions with high rigidity.

As shown in FIG. 17, the sub chassis (14) has a motor mounting frame (6) for defining the mounting position of the spindle motor (21).
6) and a pole support base (65) for supporting the base end of the lower guide pole (61) are formed by integral molding of synthetic resin. As shown in FIG. 18, the base end of the lower guide pole (61) is fitted into the pole support base (65), and the tip end of the lower guide pole (61) is sandwiched with the spacer (62) between the sub chassis (14) and the screw. It is fixed on the sub chassis (14) by (67). Further, the upper guide pole (6) is fixed to the top chassis (17) with screws by sandwiching spacers (63) (64) between both ends of the pole and the top chassis (17). As a result, the upper guide pole (6) and the lower guide pole (61) are supported at a predetermined height above each chassis (17) (14) in an accurate posture parallel to the disc radius line. .

Next, referring to FIGS. 19 to 27, the loading mechanism will be described.
(7) and the chucking mechanism (8) will be described.

The loading mechanism (7) conveys the disc (10) together with the disc tray (71) in the horizontal direction, and the disc ejection position shown in FIG. 2 and the disc storage position at the back of the tray holder (73) are at two positions. It can move back and forth between them. As shown in FIGS. 19 and 20, a pair of guide rollers (74a) (74b) are provided inwardly on the inner surfaces of both side plates of the tray holder (73). On the other hand, guide grooves (171) (172) into which the guide rollers (74a) (74b) are fitted are provided on both sides of the disc tray (71) as shown in FIGS. 21 and 22. As a result, the disc tray (71) is guided to reciprocate on the tray holder (73).

As shown in FIG. 20, the tray holder (73) is provided with a loading motor (70) and a loading gear (79) linked to the motor. On the other hand, on the back surface of the disc tray (71), as shown in FIG. 22, the loading gear (7
A rack (180) with which the (9) meshes is formed along the moving direction of the disc tray (71). Therefore, the disc tray
The driving force of the loading motor (70) causes the protrusion (71) to be retracted from the opening (12) of the front panel (11).

The tray holder (73) includes a tray-out SW (93) and a tray-out switch (93) for detecting the disc tray (71) when the disc tray (71) moves to both moving ends in the projecting and retracting direction, that is, the disc ejecting position and the disc storing position.・ In SW (94) is provided. On the other hand, as shown in FIG. 21, the disc tray (71) is provided with pins (177) and (178) projecting downward at both ends in the projecting and retracting direction for operating the SWs (93) and (94) respectively. .

The chucking mechanism (8) moves the tray holder (73) holding the disc tray (71) up and down to move the disc on the disc tray (71) back and forth between the disc storage position and the disc device position. At the same time as the disc drive position, the disc (10) is moved to the turntable (22) of the disc drive device (2) at the disc drive position.
It is to clamp up.

As shown in FIGS. 19 and 20, the tray holder (73)
A pair of slide shafts (78a) and (78b) are respectively provided on both side walls of the above so as to project outward, and the slide shafts (78a) and (78b) can slide on the side frames (15) and (16), respectively. A pair of vertical guide holes (182a) and (182b) that fit in the above are respectively provided. Therefore, the tray holder (73) is supported on the main chassis (13) so as to be able to move up and down.

Loading plates 72 are provided on the outer surfaces of the left and right side frames 15, 15 as shown in FIGS. 19 and 23, respectively. The loading plate (72) has a pair of slide pins (185a) facing the side frames (15) (16).
(185b) is projected. Meanwhile, the side frame (15) (1
In 6), a pair of horizontal guide holes (181a) (181b) into which the slide pins (185a) (185b) are slidably fitted are provided near the upper portions of the vertical guide holes (182a) (182b), respectively. ing. This will cause each loading plate (72) to move side frame (15) (1
It is supported so that it can reciprocate horizontally relative to 6).

Further, as shown in FIG. 23, the loading plate (72) has cam grooves (183) formed at both ends in the front-rear direction, which are composed of a high-order cam portion, a low-order cam portion, and an inclined cam portion connecting both cam portions, respectively.
a) (183b) is opened and the slide shaft (78a) 7
The tip of 8b) penetrates. Further, in the central portion of the loading plate (72), a long hole (184) through which the pivot shaft (111) projecting from the side frames (15) and (16) passes is opened horizontally.

In order to drive the pair of loading plates (72) back and forth,
As shown in FIG. 20, a pair of chucking gears (88) (88), which are integrally rotatably connected to each other, are pivotally supported at the lower end portions of both side frames (15) (16), and Both gears (88) and (88) are rotationally driven by a chucking motor (80) arranged on the back surface of the main chassis (13). On the other hand, as shown in FIG. 23, a rack member (108) with which the chucking gear (88) meshes is fixed to the loading plate (72).

Therefore, by driving the chucking motor 70, both loading plates 72 simultaneously reciprocate in the horizontal direction as shown in FIGS. 24 (a) and 24 (b).
The left side frame (15) has a loading plate.
A pair of tray up SW (95) and tray down SW (96) for detecting both moving ends of (72) are arranged, and a pair of SW (95) (96) for operating these tray holders (73). Protrusions (186) and (187) are provided.

As shown in FIG. 24 (a), when the disc tray (71) is ejected, the loading plate (72) is located at the moving end on the front panel (11) side. In the tray holder (73), the slide shafts (78a) and (78b) are attached to the cam grooves (183a) (1
The vertical guide groove (182a) as well as sliding contact with the high cam part of 83b)
It is in sliding contact with the upper end of (182b) and is located at the upper moving end.

After the disk tray (71) is housed in the tray holder (73) by driving the loading motor (70), the chucking motor (80) is driven to drive the disk tray (71) as shown in FIG. 24 (b). , Move the loading plate (72) to the back of the device. During this process, the slide shafts (78a) and (78b)
Vertical guide grooves (182a) (182b) driven by (183a) (183b)
Along the vertical guide groove (182a) (182b) while sliding to the lower cam portion of the cam groove (183a) (183b), the slide shaft (78a) (78b) slides to the lower moving portion along the vertical guide groove (182a) (182b). ) Will be in sliding contact with the lower end.

As a result, the disc tray (71) descends together with the tray holder (73), and the disc (10) is set on the turntable (22) of the disc drive device (2) as shown in FIG. 28 (c). The disc tray (71) is held at a position lower than the disc (10).

In order to hold the disk (10) on the turntable (22), as shown in FIGS. 19 and 20, the chucking mechanism (8)
The tray holder (73) is equipped with the clamp member (82) constituting the tray.

The clamp member (82) has a disk holding plate (81) pivotally supported by a bearing (87) at the center and a pair of arms (83) (83) at both sides. At the base end of each arm (83), a U-shaped groove (85) into which the support shaft (76) protruding outward from the tray holder (73) is fitted is provided, and at the tip of the arm, A cam surface (84) extending in an arc shape on the vertical surface is formed. The clamp member (82) is a spring stretched between both arms (83) and the tray holder (73) as shown in FIG.
(86) is urged downward about the support shaft (76) and the cam surface (84) is loaded on the loading plate (72).
It is in sliding contact with the slide pin (185b) protruding from the.

Therefore, as shown in FIG. 26 (a), when the loading plate (72) is located at the moving end on the front panel (11) side and the tray holder (73) is located at the rising end, the arm (8
3) is at the turning end in the counterclockwise direction against the spring (86) by the driving of the pin (185b) with respect to the cam surface (84). From this state, as shown in Fig. 26 (b), the loading plate (7
When the tray holder (73) moves down, the arm (83) rotates clockwise due to the bias of the spring (86) as the pin (185b) moves, and the arm (83) moves. ) Is held in a substantially horizontal position.

As a result, as shown in FIG. 27, the disc retainer (81) provided on the clamp member (82) presses down the center of the disc (10). This causes the disc (10) to
It is sandwiched between 1) and the turntable (22) and is reliably driven to rotate by the spindle motor (21).

As shown in FIG. 21, the front panel (11) has an opening (1
A door (110) for opening and closing 2) is provided. The door (110)
Is opened when the disc tray (71) is ejected from the opening (12) by the drive of the door opening / closing mechanism (101) described later,
The disc tray (71) is closed after being housed in the cabinet (1).

As shown in FIGS. 24 (a) and 24 (b), the door opening / closing mechanism (101) swings the door (110) pivotally supported by the front panel (11) by moving it with the chucking mechanism (8). It is driven by a lever (112) that operates.

As shown in FIG. 23, the lever (112) has a pivot hole (11
5) It has a long hole (113) at the center and a U-shaped groove (114) at the tip. The tip of the pivot shaft (111) protruding from the left side frame (15) is fitted into the pivot hole (115) of the lever (112), and the tray holder (73) is inserted into the long hole (113). The tip end of the protruding slide shaft (78a) is engaged.

On the other hand, the door (110) has arms at both ends as shown in FIG.
(118) is projectingly provided, and a pivot pin (11
6) is supported by the front panel, and approximately 9 around the pivot pin.
It is possible to rotate in an angle range of 0 degree. A drive pin (117) is projectingly provided at the tip of the arm (118), and the drive pin (117) is engaged with the U-shaped groove (114) of the lever (112). Therefore,
As shown in FIGS. 24 (a) and 24 (b), the lever (112) rotates as the tray holder (73) moves up and down, so that the door (11) is rotated.
0) is opened and closed.

As shown in FIG. 21, the disc tray (71) has an opening through which the turntable (22) of the disc drive device (2) is exposed.
It has (107). On the surface of the disc tray (71), a large disc mounting portion (175) with a diameter of about 30 cm and a diameter of about 20 cm
And a small disk mounting portion (176) is formed, and a window (170) for taking out a disk is opened in the large disk mounting portion (175).

Further, on both sides of the disc tray (71), there are notch portions (173) (174) through which the outer peripheral end of the large disc mounting portion (175) is exposed when the large diameter disc is mounted. It is provided. Therefore, when the disc is taken out from the disc tray (71), it is possible to put a finger on the end of the disc protruding from the notches (173) and (174), so that the disc take-out operation is easy.

When the disc tray (71) is ejected from the cabinet (1), the large disc mounting portion (175) is not completely exposed from the opening (12), and the rear end remains in the cabinet (1). ,
As shown in FIG. 21, the opening (12) of the front panel (11) has an arc shape with an upper end edge (12a) bulging upward,
This places the disc on the disc tray (71),
And easy to take out.

FIG. 29 shows an electric circuit for operating the mechanism of the video disc reproducing apparatus.

The operations such as loading and chucking are performed by the system controller (91) that is composed of a microcomputer.
Is controlled by. The input port of the system controller (91) has a key input device (92) having various operation keys such as a power key and a PLAY key, and the tray out S.
W (93), Tray-in SW (94), Tray-up SW (9
5), tray down SW (96), upper lead-in SW (97),
And the lower lead-in SW (98) is connected. Further, the output port of the system controller (91) displays an operating mode such as "loading" on the CRT to be connected to the video disc reproducing device and the display device (90) provided on the front panel. Display control circuit (99) (109) for generating a video signal for use, the loading motor (70), chucking motor (80), spindle motor
Motor control circuits (190) (191) (192) (193) for sending drive signals to the (21) and the feed motor (40) respectively are connected. The rotation of the spindle motor (21) is detected by a rotation detection circuit (194) including a photocoupler provided on the turntable (22), and the detection signal is connected to an input port of the system controller (91).

Next, an operation example of the electric circuit will be outlined with reference to FIGS. 30 to 33. Incidentally, FIG. 30 is a reproduction mode setting operation from power-on to a normal reproduction mode, FIG. 31 is a stop operation, FIG. 32 is an eject operation, and FIG. 33 is a reproduction surface changed from a disc lower surface to an upper surface. This shows the reverse reproduction operation at that time.

(1) Playback mode setting operation (Fig. 30) When the power key provided in the key input device (92) is turned on,
The stop operation shown in FIG. 31 is executed. The system controller (91) first determines (213) whether the lower lead-in SW (98) is ON, and if it is OFF, drives the feed motor (216) and turns the spindle motor OFF.
(217), and returns to the judgment (213). When the pickup device (3) moves to the innermost circumference of the signal surface below the disc (10) and the lower lead-in SW (98) turns on, the feed motor turns off.
(214) After that, it is confirmed (215) that the spindle motor (21) is completely stopped, the mode is shifted to the stop mode, and the operation of the eject key is awaited.

As shown in Fig. 30, when the eject key is turned on (2
01), the unloading operation is executed. That is, the system controller (91) operates the motor control circuit (190), drives the loading motor (70) until the tray out SW (93) is turned on, and as shown in FIG. 28 (a). The disc tray (71) is ejected from the cabinet (1).

After placing the disc (10) on the disc tray (71),
When the AY key is turned on (204), tray-in SW (94)
Drives loading motor (70) until is turned on (205)
Then, as shown in FIG. 28 (b), the disc tray (71) is housed in the cabinet (1).

When the tray-in SW (94) is turned on (206), the system controller (91) operates the motor control circuit (191) to drive the chucking motor (207) until the tray-down SW (96) is turned on. ), And the disc tray (71) is lowered as shown in FIG. 28 (c). As a result, the disc
(10) is mounted on the disk drive device (2).

When the tray down switch (96) is turned on (208), the system controller (91) causes the spindle motor (21) to rotate, and the rotation detection circuit (194) indicates that the rotation speed of the motor has reached 1800 rpm. After detecting (209), and further detecting the lead-in recording section provided on the inner circumference of the disc (210), the jump control circuit is operated (211), and the lead-in code written in the lead-in recording section is detected. After reading out at a high speed and escaping from the lead-in recording section (212), the mode is changed to the normal reproduction mode.

In the normal reproduction mode, the motor control circuit (193) and the signal reproduction circuit (not shown) are operated to move the pickup device (3) by the drive of the feed motor (40), and the signal from the rotating disc (10) is transmitted. To play.

When the signal reproduction on one side of the disk (10) is completed, the spindle motor (21) is switched to the reverse rotation, and the feed motor (40) is switched to the high speed rotation, so that the pickup device (3) as shown in FIG. Is quickly moved from the lower linear movement guide portion A to the upper linear movement guide portion B via the arcuate guide portion C. The pickup device (3) moves in the upper linear movement guide portion B until the upper lead-in SW (97) is turned on, and reaches the innermost peripheral portion of the signal surface of the disc (10).

After that, the motor control circuit (193) and the signal reproducing circuit are operated again, and the feed motor (40) is driven to move the pickup device (3) to the outer peripheral side of the disc to reproduce the disc signal surface.

(2) Stop operation (Fig. 31) and eject operation (Fig. 32) When the STOP key is turned on during signal reproduction, the stop operation shown in Fig. 31 is executed as described above.

Further, as shown in FIG. 32, when the eject key is turned on, the stop operation (218) is first executed, and after the signal reproduction is stopped, the chucking motor () is turned on until the tray up SW (95) is turned on. Fig. 28 by driving (221) 80)
The disc tray (71) is raised as shown in (b). As a result, the disk (10) is removed from the disk drive device (2). When the tray up switch (95) is turned on (22
0), system controller (91) is tray out SW
Drive the loading motor until (93) is turned on (224)
Then, as shown in FIG. 28 (d), the disc tray (71) is ejected from the cabinet (1). Tray out SW (93)
When is turned on (220), the loading motor (70) and the chucking motor (80) are turned off (222) (223). As a result, the disc (10) can be taken out.

(3) Reverse reproduction operation (Fig. 33) For example, when the key for instructing reproduction of the upper surface is operated during reproduction of the lower surface of the disc, first, the display control circuit (99) (10
9) is operated, the image display of the CRT is interrupted, and the CRT is
"J Turn" on the screen and the screen of the display device (90).
Is displayed. Also, after the spindle motor (21) is rotated in the reverse direction, the feed motor (40) is rotated at high speed until the upper lead-in SW (97) is turned on, so that the big up device (3) is moved to the inner circumference of the upper surface of the disc. Move to the club quickly.

When the upper lead-in SW (97) is turned on (227), it is confirmed that the spindle motor (21) has reached 1800 rpm (229), and after detecting the lead-in recording section provided on the inner circumference of the disc ( 230), the jump control circuit is operated (231), the lead-in code is quickly read out, the lead-in recording section is escaped (232), and then it is determined whether the normal reproduction mode is set (233). , In normal playback mode,
While displaying the normal playback mode on the CRT,
Turn off the mute operation of the screen and shift to the normal playback mode. If it is determined in the judgment (233) that the program reproduction mode is set, the CRT displays the program reproduction mode and shifts to the program reproduction mode. In the program play mode, the feed motor (40) is operated according to the preset program.
Is controlled so that the signals are reproduced in a predetermined order from the plurality of image recording units formed on the disc.

The configuration of each part of the present invention is not limited to the above embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

(G) Effect of the Invention Since the present invention is configured as described above, the transition of the guide pole into the fitted state with respect to the fitting hole is smoothly performed, and rattling at the time of linear movement of the big up is prevented, and the disc A stable reproduction operation on both sides is possible.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a pickup transfer device according to the present invention, FIG. 2 is a perspective view showing the external appearance of a video disk reproducing device, and FIG. 3 is a plan view showing a main part of the pickup transfer device. FIG. 5 is a left side view of the self-propelled mechanism, FIG. 5 is a plan view showing the positional relationship of the pickup device and the guide mechanism with respect to the optical disc, and FIG. 6 is a front view of the pickup transfer device.
FIG. 7 is a side view showing each guide part of the guide mechanism, FIG. 8 is a perspective view showing a main part of the pickup device and the guide mechanism, and FIG.
The figure shows a perspective view of the device of FIG. 8 seen from different directions,
FIG. 11 is a perspective view of the pickup device, FIG. 11 is a cross-sectional view of the pivot portion, FIG. 12 is a perspective view of the pickup device as viewed from the back side, and FIG. 13 is a side view showing the positions of a pair of lead-in switches. Figure 14 is an exploded perspective view of the right guide rail,
FIG. 15 is a sectional view showing the assembly structure of the right guide rail to the chassis, FIG. 16 is a perspective view of the main chassis and the sub chassis, FIG. 17 is a perspective view of the sub chassis, and FIG. 18 is a guide pole mounting structure. 1 is a partially cutaway side view showing
9 is a plan view showing the chucking mechanism, FIG. 20 is an exploded perspective view of the main chassis, the tray holder and the clamp member, FIG. 21 is a perspective view of the disc tray removed from the cabinet, and FIG. 22 is a loading mechanism. FIG. 23 is a rear view of the disc tray for use with the chucking mechanism, FIG. 23 is an exploded perspective view showing the chucking mechanism, FIG. 24 is a side view showing the operation of the loading plate, and FIG. 25 is an exploded perspective view showing the main part of the door opening / closing mechanism. FIG. 26 is a view showing the operation of the chucking mechanism as viewed from the inside of the main chassis, FIG. 27 is a partially cutaway side view showing a disk chucking state, and FIG. FIG. 29 is a block diagram showing an electric circuit for explaining a series of operations until the completion of king, FIG. 30, FIG. 31, FIG. 32, and FIG. 33 are electric circuits, respectively. Is a flowchart showing the operation. (10) …… Disc, (31) …… Pickup, (30)…
... Support base, (35) ... Slide groove, (A) ... Lower linear movement guide part, (B) ... Upper linear movement guide part, (C) ... Arc-shaped guide part, (6) (61) ...... Guide pole.

Claims (1)

[Claims] 1. A first surface of a disk and a second surface on the back side of the first surface.
A pickup capable of reproducing information on both sides of the surface; a movable base that is moved integrally with the pickup by a transport mechanism; a fitting hole formed in the movable base; A first linear guide portion that linearly guides the movable base parallel to one surface to allow the pickup to move forward and backward in the radial direction of the first surface; and a first linear guide portion that is parallel to the first linear guide portion and A second linear guide portion that is arranged so as to face the second surface, and that guides the movable base linearly in parallel to the second surface to allow the pickup to advance and retreat in the radial direction of the second surface; A third guide portion that is disposed outside the outermost periphery of the disc and that guides the movement between the linear guide portions of the movable base; and a third guide portion that is arranged in parallel with the first linear guide portion, 1 Move on the straight line guide A first guide pole that fits only in the slide groove, and a second guide portion that is arranged in parallel with the second guide portion. Only when the movable base moves on the second guide portion, 2. A disk double-sided reproducing apparatus comprising: a second guide pole to be fitted, wherein the tips of the both guide poles on the side of the third guide portion are tapered so that the diameter is gradually reduced.