JPH0574149B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to an information recording disc player, and more particularly to a disc player that plays a digital audio disc on which PCM signals are recorded.

Background Art A disc player that plays a digital audio disc is, for example, a so-called optical disc player that irradiates a signal hole (pit) recorded on the disc with a laser beam and reads the signal by detecting a change in reflected light depending on the presence or absence of the signal hole. There is a type signal detection method. FIG. 8 shows the main parts of an optical signal detection type disc player that has already been developed.

As shown in FIG. 8, a carriage 103 is provided which carries an optical pickup means including an objective lens 102 for irradiating the recording surface of the disk 101 with spot light. The carriage 103 is slidably supported by two guide shafts 105 arranged parallel to the disk carrying surface 104a of the turntable 104. Both guide shafts 105 are support mechanisms (not shown) that support the turntable 104.
is attached to. Both guide shafts 105
A screw shaft 106 is arranged parallel to the screw shaft 106, and is rotatably attached to the support mechanism at both ends thereof. This screw shaft 106 is given rotational force by a motor 110 via pulleys 107 and 108 and a belt 109. A nut member 103a is provided protruding from the side of the carriage 103, and the nut member is screwed into the screw shaft 106. That is, the rotation of the screw shaft 106 causes the carriage 103 to reciprocate.

The actuator 1 is located near the turntable 104.
A detection switch 111 is provided such that the detection switch 11a engages with the end of the carriage 103 in the moving direction. This detection switch 111 is
3 has reached its home position, that is, the rest position before playing, and acts as a detection/stop means for stopping the carriage 103.

In the disk player described above, the carriage 103 is connected to the actuator 111 of the detection switch 111.
The carriage is stopped in the home position by directly engaging a. However, the operating stroke of the actuator 111a of the detection switch 111 differs slightly depending on the detection switch used in each disc player, so it is difficult to accurately operate the detection switch 111 when the carriage 103 reaches the home position. In order to do this, it is necessary to adjust the position of the detection switch for each disc player. Therefore, the assembly and adjustment work of the disk player has become complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and its object is to provide an information recording disk player that is easy to assemble and adjust, especially regarding the carriage stop mechanism.

An information recording disk player according to the present invention includes a drive means for driving a carriage carrying an optical pickup means, and a detection and stop means for detecting that the carriage has reached a home position and stopping the carriage. the drive means includes a screw shaft extending along the direction of movement of the carriage and rotatably supported at both ends by bearing members; and a screw shaft provided on the carriage and screwed into the screw shaft. and a nut member, the screw shaft is movable within a predetermined range along its rotational center axis, and the detection and stop means contacts the carriage to control the movement of the carriage to its home position. a movement regulating member that is movable along the screw shaft and that engages with the screw shaft to urge the screw shaft toward the bearing member on the home position side. The present invention is characterized by comprising a moving member, a biasing force applying means for applying a biasing force to the movable member, and a detection switch arranged to engage with the movable member.

Embodiments Hereinafter, an information recording disc player as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the disc player has a support mechanism consisting of a pair of support plates 1 and 2 arranged in parallel. The support plate 1 is made of a steel plate, and the support plate 2 is made of resin, and they are connected to each other by screws 3. A turntable 4 is attached to the support plate 1, and both support plates 1 and 2 are spaced apart from each other by a predetermined distance in a direction perpendicular to the disk carrying surface 4a of the turntable. A screw shaft 5 is arranged between the support plates 1 and 2 and extends parallel to the disk carrying surface 4a of the turntable 4. The screw shaft 5 is rotatably supported at both ends by a pair of bearing members 6 and 7 provided on the support plate 2. Also, screw shaft 5
is movable within a predetermined range along its rotation center axis. Note that the support plate 2 is integrally formed with a claw portion 2a that restricts the separation of the screw shaft from the bearing members 6, 7.

As shown in FIG. 3, a moving member 9 made of a steel plate is arranged below the screw shaft 5, and is attached to the support plate 2 so as to be movable along the screw shaft 5. . The movable member 9 engages with the end of the screw shaft 5 at an elevated surface 9a formed at one end thereof, and urges the screw shaft 5 toward the bearing member 6. A coil spring 10 is connected to a cut-and-raised portion 9b formed approximately at the center of the movable member 9, as a biasing force applying means for applying a biasing force to the movable member. A motor 11 is provided on the support plate 2 and on the side of the screw shaft 5. A spur gear 11a is fitted to the output shaft of the motor 11, and this spur gear 11a meshes with a spur gear 5a fitted to the screw shaft 5. Note that the spur gear 11a
is thick enough that the screw shaft 5
Even if the spur gear 5a moves within a predetermined range in the direction of the rotation center axis, the spur gear 5a will not separate from the spur gear 11a.

A single guide shaft 13 is provided parallel to the screw shaft 5, and is supported at both ends by legs 2c formed on the support plate 2. As shown in FIGS. 4a and 4b, a coil spring 14 is compressed between the guide shaft 13 and each leg 2c. Further, a spherical member 15 is interposed between the guide shaft 13 and the coil spring 14. That is, both ends of the guide shaft 13 are connected to the support plate 1.
It is positioned relative to the turntable 4 by engaging with the lower surface of the turntable 4, and is fixed by being held between the support plates 1 and 2. The coil spring 14 and the spherical member 15 constitute a mounting means for mounting both ends of the guide shaft 13 to the above-mentioned support mechanism (consisting of support plates 1 and 2).

As shown in FIG. 4b, the coil center axes of the coil springs 14 are offset from each other by e so that they do not intersect with the center axis of the guide shaft 13.
With this configuration, the guide shaft 1 in the direction parallel to each support plate 1, 2
3. The rattling can be suppressed.

As shown in FIGS. 1 and 2, a carriage 17 is slidably supported by a guide shaft 13 at the center of gravity. Carriage 17 is
It carries an optical pickup means including an objective lens 19 for irradiating a spot light onto the recording surface of an information recording disk 18 (shown in the first figure) to be played.

As shown in FIGS. 1, 2, and 5b, a holder 21, which is a part of the carriage, is attached to one end of the carriage 17 in the moving direction by a screw 22. As shown in FIGS. As shown in FIGS. 1, 2, and 6a and 6b, the holder 21 is formed with a circular groove 21a that is substantially perpendicular to the disk supporting surface 4a of the turntable 4. A spherical member 23 is inserted inside. This spherical member 23 is in sliding contact with a guide path 1a (shown in the first figure) formed on the lower surface of the support plate 1, which is a part of the support mechanism, and parallel to the guide shaft 13. Also,
The holder 21 has a tapered portion 24a formed at its tip, and an adjustment screw 24 that engages with the spherical member 23 at the tapered portion is screwed into the holder 21. These spherical members 23
and the adjusting screw 24 constitute an adjusting means for adjusting the inclination angle of the carriage 17 in a plane perpendicular to the direction of movement of the carriage. That is, by rotating the adjustment screw 24, the angle of inclination of the carriage 17 is adjusted. Furthermore, by configuring the adjusting means using simple and inexpensive members such as the spherical member 23 and the adjusting screw 24, assembly work is facilitated and costs are reduced.

As shown in FIG. 6a, the center axes of the adjusting screws 24 are offset from each other by f so that they do not pass through the center of the spherical member 23. This prevents the spherical member 23 from wobbling within the circular groove 21a of the holder 21. Further, the adjustment screw 24 is provided parallel to the moving direction of the carriage 17. Therefore, no matter where the carriage 17 is stopped on the guide shaft 13, the guide shaft 1
The adjusting screw 24 can be rotated by inserting an adjusting screwdriver parallel to the screw 3. That is, it is only necessary to provide one opening for inserting a driver in the player housing of the information recording disc player.

As is clear from FIGS. 1 and 2, the carriage 17 is held and guided by the guide shaft 13 and the guide path 1a of the support plate 1 (shown in FIG. 1) on one side in the direction of movement of the carriage. , an objective lens 19 carried on the carriage.
is arranged on the other side of the one side and located outside the main surface of the support plate 1. More specifically, the objective lens 19 is located outside the outer contour of the support plate 1 in a plane parallel to the main surface of the support plate 1. This configuration allows the support plate 1 to be made smaller. If the guide shaft 13 were to hold and guide both sides of the carriage 17, the support plate 1 for positioning the guide shaft would have to extend from one side of the carriage 17 to the other side. This is because it has to be something large that extends all the way.

As shown in FIG. 1, FIG. 2, and FIG. 5 a and b, an arm member 26 is attached to a holder 21 provided on the carriage 17 at one end thereof through a screw 27 and a washer 28. It can be installed freely. The central axis of the screw 27, that is, the arm member 26
The pivot axis of the screw shaft 5 is parallel to the screw shaft 5, and therefore, the arm member pivots in a plane perpendicular to the rotation center axis of the screw shaft 5. A half nut 30 as a nut member is provided at the free end of the arm member 26, and the half nut 30 is threadedly engaged with the screw shaft 5. Further, the arm member 26 is configured such that a long hole 26a formed in the arm member and extending in a direction substantially perpendicular to the rotation center axis of the screw shaft 5 is slidably fitted into the screw 27. Supported by screws. That is, the arm member 26
is movable within the range of this elongated hole 26a in a direction substantially perpendicular to the rotation center axis of the screw shaft 5.

When assembling the above-mentioned screw shaft 5, guide shaft 13, carriage 17, arm member 26, etc., the relative position dimensions of the screw shaft 5 and the carriage 17 in a direction substantially perpendicular to the direction of carriage movement are the normal relative positions. It may deviate from the dimensions. This is because the arm member 26 is swingable around the screw 27 and the arm member 26 is movable in a direction substantially perpendicular to the rotation center axis of the screw shaft 5 through the elongated hole 26a. This deviation is then corrected.

As shown in FIGS. 1 and 5b, the screw 27
A cylindrical portion 2 formed in the holder 21 to fit into the cylindrical portion 2
A spring member 31 is fitted into 1c. One end of the spring member 31 is engaged with a protrusion 21d protruding from the end surface of the holder 21, and the other end of the spring member is engaged with a free end of the arm member 26. The spring member 31 acts as a pressure contact means for urging the arm member 26 so that the half nut 30 described above comes into pressure contact with the screw shaft 5. Further, this spring member 31 is attached to the carriage 1.
A spherical member 23 provided on (the holder 21 of) 7 also serves as a biasing means for biasing the carriage so as to approach the guide path 1a of the support plate 1 (see FIG. 1).

As shown in FIG. 5b, the half nut 30 provided at the free end of the arm member 26 is disposed between the screw shaft 5 and the support plate 1, and as shown in FIG. The half nut has a guide path 1a (see FIG. 1) provided as an abutment plane provided on the support plate 1 and a small gap:
A protrusion 30a is formed at a distance of g.

In addition, as shown in FIGS. 1, 2, and 5b, the half nut 30 is provided with a screw that slides on the screw shaft 5 to allow the half nut 30 to swing in the direction along the rotation center axis of the screw shaft. A semi-cylindrical regulating portion 30b is formed to regulate the. By providing this restricting portion 30b, the half nut 30, and thus the arm member 26, can smoothly move along the screw shaft 5 without swinging in the direction of the rotation center axis of the screw shaft 5.

Here, the guide path 1a of the support plate 1 described above is
, guide shaft 13, and coil spring 1
4 and the spherical member 15, the adjusting means consisting of the spherical member 23 and the adjusting screw 24, the spring member 31 as the biasing means, and peripheral small members related thereto. A guide means is configured to guide the turntable 4 along the disk carrying surface 4a, that is, the recording surface of the information recording disk 18. Further, the screw shaft 5, the bearing members 6 and 7 on the support plate 2, the motor 11, the spur gear 11a, the arm member 26, the half nut 30, the spring member 31 as the pressure contact means, and A driving means for driving the carriage 17 is constituted by related peripheral small members. As is clear from the above description, this drive means is provided on the support plate 2.

As shown in FIGS. 1 to 3, a detection switch 33 is arranged on the support plate 2 so that the vertical surface 9c formed at the end of the moving member 9 engages with its actuator 33a. has been done. Also, the third
As shown in the figure, a movement restricting member 34 is provided that comes into contact with the end of the carriage 17 in the moving direction and restricts the movement of the carriage at its home position, that is, at its rest position before playing. There is. This movement regulating member 34 is the support plate 1
is integrally formed.

The above-mentioned detection switch 33 and movement restriction member 3
4, the moving member 9, and the coil spring 10 as a biasing means constitute a detection and stop means for detecting that the carriage 17 has reached the home position and stopping the carriage. There is.

The flexible printed circuit board 35 shown in FIGS. 1 and 2 supplies power to the optical pickup means in the carriage 17 and transmits read signals.

The operation of the information recording disc player described above will be briefly explained with reference to FIGS. 7a and 7b.

As the motor 11 rotates, the screw shaft 5 is rotated, and the half nut 3 is rotated.
0, the carriage 17 is driven via the arm member 26 and the spring member 31 and moves in the direction of arrow A. As shown in Figure 7a, the carriage 17
When it reaches the home position, the movement regulating member 3
4 and its movement is restricted. Then, as shown in FIG. 7b, the screw shaft 5 moves in the direction of arrow A due to the reaction force, and the moving member 9 also moves accordingly. This movement of the moving member 9 is detected by the detection switch 33, and the carriage 17 is stopped. After this, carry 1
7 is driven in the opposite direction of arrow A to perform the performance.

Effects of the Invention As detailed above, the information recording disk player according to the present invention includes a driving means for driving the carriage 17 carrying an optical pickup means, and a drive means for driving the carriage 17 carrying an optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and a drive means for driving the carriage 17 carrying the optical pickup means, and for detecting when the carriage has reached the home position. sensing and stopping means for stopping the carriage, the drive means extending along the direction of movement of the carriage and bearing members 6,
A screw shaft 5 is rotatably supported at both ends by a screw shaft 7, and a nut member (half nut 30) provided on the carriage and screwed into the screw shaft. a movement regulating member 34 that is movable within a predetermined range along the central axis, and the detection and stop means contacts the carriage to regulate the movement of the carriage at the home position of the carriage;
and a moving member 9 that is movably provided along the screw shaft and engages with the screw shaft to urge the screw shaft toward the bearing member 6 on the home position side. , a biasing force applying means (coil spring 10) that applies biasing force to the movable member, and a detection switch 33 arranged to engage with the movable member.

That is, after the carriage reaches the home position and its movement is regulated by the movement regulating member, the screw shaft moves by a predetermined distance along the rotational center axis due to the reaction force, and as a result, the above-mentioned The movable member moves, and the movement of the movable member is detected by the detection switch to stop the carriage. in this way,
Since the detection switch is configured to operate using the large movement of the moving member after the carriage reaches the home position, the detection switch is always operated reliably regardless of variations in the operating stroke of the detection switch actuator. It works. Therefore, it is not necessary to adjust the position of the detection switch for each disc player, and the work of assembling and adjusting the disc players becomes simple.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a plan view, respectively, of the internal structure of an information recording disk player according to the present invention, FIGS. 3 to 6b are partial detailed views of the internal structure, and FIGS. 7a and 7b are partial views of the internal structure. b is a diagram for explaining the operation of the information recording disc player, and FIG. 8 is a diagram for explaining an already developed disc player. Explanation of symbols of main parts, 1, 2...Support plate, 1a...Guideway, 4...Turntable, 5
... Screw shaft, 6, 7 ... Bearing member,
9... Moving member, 10, 14... Coil spring, 11... Motor, 13... Guide shaft,
15, 23... Spherical member, 17... Carriage,
18...Information recording disk, 19...Objective lens, 24...Adjustment screw, 24a...Tapered portion, 2
6...Arm member, 30...Half nut, 30
a... Protrusion, 31... Spring member, 33... Detection switch, 34... Movement regulating member.

Claims (1)

[Claims] 1: a support mechanism, a guide means provided on the support mechanism, a carriage supporting an optical pickup means and guided by the guide means, a drive means for driving the carriage, and a drive means for driving the carriage, and a drive means for driving the carriage; detection and stopping means for detecting that the carriage has reached the position and stopping the carriage, and the driving means extends along the moving direction of the carriage and is rotatably supported at both ends by bearing members. a screw shaft,
a nut member provided on the carriage and screwed onto the screw shaft; the screw shaft is movable within a predetermined range along its rotation center axis; and the detection and stop means is connected to the carriage. a movement regulating member that abuts to restrict movement of the carriage at the home position; and a movement regulating member that is movably provided along the screw shaft and that engages with the screw shaft to move the screw shaft to the home position. a movable member for biasing the bearing member on the side of the shaft; a biasing force applying means for applying a biasing force to the movable member; and a detection switch arranged to engage with the movable member. An information recording disk player characterized by: