JP2001344887A - Disk recording or reproducing device and temporary set screw used for this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a bracket and to prevent the fall of compression springs from temporary set screws. SOLUTION: A regulating mechanism 5 which moves the bracket 8 horizontally in a direction orthogonal with a direction along a guide shaft 6 has temporary set screws 9 of which the front ends are screwed to a chassis 1 through through-holes 84 bored at the bracket 8 and which are fitted with compression springs 90 to thrust and energize the bracket 8 to the chassis 1. The screwing parts of the temporary set screw 9 to the chassis 1 and the segments which are fitted with the springs 90 and pass the bracket 8 are formed to approximately the same diameter. The springs 90 are formed of magnetizable materials and are fitted to the temporary set screw 9. The screws are attracted to a screw driver 96 having a magnetized front end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording or reproducing apparatus provided with a pickup for emitting a beam to a disk, and a temporary fixing screw used in the apparatus.

[0002]

2. Description of the Related Art FIG. 12 is a perspective view of a conventional disk recording or reproducing apparatus. Disk D is cartridge (3)
The cartridge (3) is placed on the chassis (1). The chassis (1) is provided with a turntable (4) for rotating the disk D, and the center of the turntable (4) coincides with the center of the disk D. The chassis (1) has a lens (21) for emitting a beam to the disk D.
A pickup (2) provided with a control device is provided on the turntable (4) so as to be able to approach and separate therefrom. FIG. 11 is a rear view of a conventional disk recording or reproducing apparatus. Turntable (4)
Has a bracket (8) having a flange plate (81) to be screwed to the chassis (1). Pickup (2)
Are fitted on the first and second guide shafts (6) and (60) supported by the holding pieces (16) and (16), respectively, so that the center of each of the lens (21) and the turntable (4) is The original movement on the connecting virtual line L is performed.
The pickup (2) is fitted with a margin to the second guide shaft (60) more than the first guide shaft (6), and guided by the first guide shaft (6). A motor (17) is provided on the chassis (1) beside the opening (10), and the motor (17) is provided with an intermediate gear (1).
Connect to pickup (2) via 5). When power is supplied to the motor (17), the pickup (2) moves.

In some cases, the first guide shaft (6) is inclined with respect to the imaginary line L in a plane parallel to the chassis (1) due to a play in the chassis (1). In this case, the lens (21) follows a transition path deviating from the imaginary line L, and there is a possibility that the signal of the disc may not be accurately reproduced for a reason described later. Therefore, the adjustment mechanism (5) for horizontally moving the turntable (4) in a direction orthogonal to the direction along the guide shaft (6) and superimposing the virtual line L, which is the transition path of the lens (21), on the center of the disk is provided. Is provided. This is achieved by opening a long hole (83) extending in the left-right direction perpendicular to the direction along the guide shaft (6) in the bracket (8), and fitting the protrusion (13) of the chassis (1) into the long hole (83). ing.
The applicant refers to the adjustment to move horizontally in the direction orthogonal to the direction along the guide axis (6) as the adjustment in the normal direction, and the term of adjustment in the normal direction is used in the following description.

To adjust the turntable (4), once the screws (14) and (14) are loosened, the bracket (8) is moved to the left and right, and then the screws (14) are inserted into the screw holes (12) of the chassis (1). 14) (14) (14)
And screw the bracket (8) with the screws (14) (14) (14). However, if you loosen the screw (14) too much,
When the (4) is moved right and left, the turntable (4) may be lifted up, making adjustment difficult. In view of this point, a temporary fixing screw (9) may be used instead of the screw (14). As shown in FIG. 10, a large-diameter shaft (91) fitted with a compression spring (90), a small-diameter shaft (92) fitted on the bracket (8) and having a lower end surface in contact with the chassis (1), It has a screw shaft (93) screwed into the chassis (1). When the temporary fixing screw (9) is tightened until the peripheral edge of the small diameter shaft (92) contacts the chassis (1), the compression spring (90) urges the bracket (8) toward the chassis (1). Bracket (8) is chassis with friction
(1) The upper part can be slid and the bracket (8)
There is no danger of floating.

[0005]

The conventional temporary fixing screw (9)
Thus, the small diameter shaft (92) has a larger diameter than the screw shaft (93). Applicant can reduce the diameter of the small-diameter shaft (92) by using the bracket (8).
The idea was that the size of the chassis (1) could be reduced, and consequently the chassis (1) could be reduced in size. On the other hand, the temporary fixing screw (9) is
0), but when the temporary fixing screw (9) is carried to the chassis (1), this compression spring (90) is prevented from falling off,
It is also necessary to improve workability. The present invention aims to solve the above problems.

[0006]

[Means for solving the problem] The bracket (8) is connected to the guide shaft.
The adjustment mechanism (5) for horizontally moving in the direction perpendicular to the direction along (6) has a through hole formed at the tip end of the bracket (8).
A spring (90) screwed into the chassis (1) through (84) and urging the bracket (8) toward the chassis (1).
Is provided with a temporary fixing screw (9) fitted therein.
The portion of the screw (90) that is engaged with the chassis (1) and the portion where the spring (90) fits and passes through the bracket (8) are formed to have substantially the same diameter. Further, the spring (90) is formed of a magnetized material, and is attracted by the driver (96) whose front end is magnetized by being fitted into the temporary fixing screw (9).

[0007]

[Operation and Effect] 1. Since the screwing portion of the temporary fixing screw (9) with the chassis (1) and the portion passing through the bracket (8) are formed to have substantially the same diameter, the conventional temporary fixing screw (9) is used. The portion that fits in the bracket (8) has a smaller diameter than that of the bracket (8). As a result, the size of the bracket (8) can be reduced, and as a result, the size of the chassis (1) can be reduced. 2. Since the spring (90) is fitted to the temporary fixing screw (9) and attracted by the driver (96) whose front end is magnetized, the spring (90) is moved when the temporary fixing screw (9) is transported to the chassis (1). (90) does not fall out of the temporary fixing screw (9). By this, temporary fixing screw
Workability when screwing (9) to the chassis (1) can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a rear view of the disk recording or reproducing apparatus. The present application is characterized by the improvement of the temporary fixing screw (9) used for the adjusting mechanism (5) for moving the turntable (4).
First, an outline of a disk recording or reproducing apparatus will be described. As before, in the opening (10) provided in the chassis (1),
A turntable (4) for rotating the disk (D) is provided, and a pickup (2) having a lens (21) for emitting a beam to the disk (D) is provided on the turntable (4) so as to be able to approach and separate therefrom. The pickup (2) is fitted on the first and second guide shafts (6) and (60) supported at both ends by the holding pieces (16) and (16), and is provided between the lens (21) and the turntable (4). Originally, it moves on a virtual line L connecting the centers. As shown in FIG. 1, the turntable (4) has a bracket (8) in contact with the chassis (1), and the bracket (8) is attached to the chassis (1) with temporary fixing screws (9) and screws (14). Can be

FIG. 2 is a cross-sectional front view of FIG. 1 as viewed from the direction F, and is shown upside down. The turntable (4) has a rotor (41) mounted on a mounting surface (40) supporting the disk D, and the rotor (41) has a through hole formed in the chassis (1).
Through (11). On the inner surface of the rotor (41), a magnet ring (42) in which S and N poles are alternately formed in the circumferential direction is attached. The chassis (1) is provided with a metal bracket (8) that covers the rotor (41). The bracket (8) includes a cylinder (80) located outside the rotor (41) and a cylinder (80). 80) and a flange plate (81) extending outward from the lower edge. Tube (80)
The center shaft (43) of the turntable (4) is fitted to a bearing (44) provided at the center of the coil, and a coil piece (45) facing the magnet ring (42) is fitted on the outer peripheral surface of the bearing (44). Is provided. As is well known, a motor (M) is constituted by the coil piece (45) and the rotor (41), and when the coil piece (45) is energized, the rotor (41) rotates. The flange plate (81) is provided with horizontally elongated holes (82) and (82) extending left and right, and protrusions (13) and (13) are formed on the chassis (1) at positions corresponding to the elongated holes (82) and (82). Is provided. The protrusion (13) is a horizontally long hole
The bracket (8) and the turntable (4) can be moved to the left and right by this margin, but the movement in the direction along the guide shaft (6) is restricted. That is, the bracket (8) constitutes a mechanism (5) for adjusting the mounting position of the turntable (4).

[0010] As shown in attachment Procedure Figure 1 of the bracket, at the flange plate (81) on the bracket (8),
A long hole (83) extending in a direction along the guide shaft (6) is opened near the left long hole (83). The positioning hole (18) formed in the chassis (1) covers the elongated hole (83), and the diameter of the positioning hole (18) and the width of the elongated hole (83) are substantially equal. FIG.
FIG. 5 is an exploded perspective view of the bracket (8) and the chassis (1), showing a state where the bracket (8) is attached. The bracket (8) has through holes (84) through which screws (14) (14) and temporary fixing screws (9) (9) pass.
(84) (84) was opened and the through holes (84) (84) on the chassis (1)
Screw holes (12), (12), and (12) are opened at the location overlapping (84).

The position adjustment of the turntable (4) is performed in the following manner. Cartridge (3) from above chassis (1)
(See FIG. 12). A reference signal is recorded on the disk in the cartridge (3). The cartridge (3) is supported by a holder (not shown) connected to the chassis (1) to prevent the cartridge (3) from dropping from the chassis (1). In order to turn the chassis (1) upside down and attach the bracket (8), first, the slot (83) shown in FIG.
8) Pass the positioning pin (75) from below. Bracket (8)
Of the positioning hole (18) and the positioning pin (7
It is regulated by the fitting of 5). This allows the bracket
(8) and turntable (4) with respect to chassis (1)
It can be mounted without any significant deviation from the original mounting position.

Next, the temporary fixing screw (9) is screwed into the screw hole (12) through the through hole (84). As shown in FIG. 4, the temporary fixing screw (9) has a round shaft (94) in which a compression spring (90) fits and a chassis.
The outer diameter of the screw shaft (93) screwed into the screw hole (12) of (1) is formed to be the same, and is provided by rolling. That is, the diameter of the round shaft (94) is larger than that of the conventional temporary fixing screw (9).
Small diameter compared to 1). As a result, the diameter of the through hole (84) of the bracket (8) can be reduced, so that the size of the bracket (8) can be reduced, and the size of the chassis (1) can be reduced. When the temporary fixing screw (9) is tightened, the compression spring (90)
(8) is urged toward the chassis (1). Locating pins (7
When the 5) is removed, the bracket (8) has friction with the chassis.
(1) It is possible to slide on the top. However, round shaft (94) and screw shaft
By providing the same outer diameter of the screw shaft (93), the position of the imperfect screw portion which is the boundary between the screw shaft (93) and the round shaft (94) varies, that is, the length of the screw shaft (93) varies. There is a risk of sticking. Anyway,
Since the disk D is mounted on the turntable (4), the surface of the cartridge (3) facing the chassis (1) is generally separated from the chassis (1). Therefore, even if the length of the screw shaft (93) varies, the tip of the screw shaft (93) is
There is no danger of hitting the lower surface of the.

After screwing the temporary fixing screw (9), the eccentric pin (55)
Into the positioning hole (18) through the long hole (83). FIG.
It is a perspective view of an eccentric pin (55). The eccentric pin (55) has a fitting shaft (56) fitted in the positioning hole (18), and a kick shaft (eccentric to the fitting shaft (56) and fitted in the long hole (83) of the bracket (8). 57)
A receiving shaft (58) having a lower end in contact with the flange plate (81) is provided.

FIGS. 6 (a) and 6 (b) are side sectional views showing a state where the eccentric pin (55) is fitted into the positioning hole (18) of the chassis (1) through the bracket (8). As shown in FIG. 6 (a), the receiving shaft (58) is placed on the flange plate (81), and the ejection shaft (57) is fitted in the long hole (83). When the eccentric pin (55) is rotated to the center, the ejection shaft (57) pushes the side edge of the long hole (83) to move the bracket (8) right and left. Play the disc,
While checking the reproduction waveform of the reference signal, the movement of the bracket (8) is stopped when the waveform becomes the best. Since the bracket (8) is pressed by the compression spring (90) of the temporary fixing screw (9), the bracket (8) does not rise during adjustment. As a result, the turntable (4) is moved right and left, and adjustment in the normal direction is performed. After the adjustment, pull out the eccentric pin (55), and insert the screws (14) and (14) through the through holes (84) and (84).
(12) and fix the turntable (4) to the chassis (1). As described above, the disk D is the cartridge (3)
Although the disc D is generally provided in the cartridge (3) so as to be movable by a very small amount in the horizontal direction, even if the turntable (4) is finely adjusted in the normal direction, It does not affect the mounting of the disc D on the turntable (4).

Incidentally, when the above devices are mass-produced, the chassis
Due to the variation in accuracy of (1) and turntable (4),
Depending on the production lot, without adjusting the normal direction,
In some cases, the reproduction waveform of the reference signal is the best. For such a lot, it is not necessary to adjust the normal direction, and the screws (14) and (14) may be screwed into the chassis (1) with the positioning pin (75) removed. Also, as shown by the dashed line in FIG. 3, the screw holes (12) and the through holes (84) are
Opened on the raised surface (19) from (1), bracket
(8) A protruding surface (not shown) may be provided at a position where the lower surface is in contact with the protruding surface (19). In such a configuration, the surface on the chassis (1) to which the bracket (8) is attached has three protruding surfaces (19) and (19).
Determined by (19), and tentatively projecting on the chassis (1) (19) (1
9) Chassis of bracket (8) even if parts other than (19) are distorted
The mounting accuracy on (1) is not affected.

In this embodiment, the eccentric pin (55) is inserted from above the bracket (8) and inserted into the positioning hole (18) overlapping the bracket (8). That is, since the adjustment mechanism (5) for adjusting the normal direction is provided in the bracket (8), the chassis (1) does not increase in size. In addition, since the positioning hole (18) for positioning and attaching the turntable (4) first can be used for adjusting the normal direction, there is no need to provide a separate hole in the chassis (1). However, it can contribute to miniaturization of the chassis (1).

FIG. 7 shows a guide shaft (6).
FIG. 11 is an enlarged plan view showing a normal line shift state in which the transition path of the lens (21) is shifted laterally by a length H near the center of the disk from the normal virtual line L due to an assembly error or the like. An imaginary line indicating the transition path of the lens (21) is L1. Since FIG. 7 is an enlarged view, L1 is described in parallel with the imaginary line L when the center of the disk is at a correct position, but is actually inclined with respect to the imaginary line L as shown in FIG. When this normal shift occurs, the bracket (8) and the turntable (4) are moved to the right by H. The reason for performing this adjustment will be described. If the transition path of the lens (21) is the virtual line L, the signal is reproduced at the point A in FIG. 7 when the lens (21) of the pickup (2) faces the vicinity of the outer periphery of the disk. However, since the normal line is displaced, a signal to be reproduced at the point A is reproduced at the point B which is separated from the point A by H. Although the signal is reproduced, the reproduced signal is out of phase with the normal signal by the angle θ1 in FIG. The angle θ1 is indicated by the sine of the normal deviation H and the radius R1 of the disk. Therefore, the more the signal recorded on the inner periphery of the disk is reproduced, the greater the phase shift. For example, a signal located on r1 whose distance from the center of the disc is smaller than R1 will be reproduced at point B1, though it should be reproduced at point A1, and an angle larger than angle θ1. A phase shift of θ2 occurs. In particular, the phase shift becomes remarkable in a disk having a constant angular velocity. In order to eliminate this phase shift, the bracket (8) and the turntable (4) are moved so that the center of the disk is located on the transition path L1, as shown by the two-dot chain line in FIG.

As is well known, many fine bits for reflecting a beam are formed on a disk. FIG.
(a) and (b) are enlarged plan views showing bits on the disk, where (a) shows point A in FIG. 7 and (b) shows point B in FIG.
The beam emitted from the lens (21) of the pickup (2) is composed of one main beam (7) and two sub-beams (70) (70). The main beam (7) receives the bit Y and the sub beam (70)
(70) irradiates the bits X and Z adjacent to the bit Y, respectively. An angle θ3 formed by a row of the beams (7), (70), and (70) with a normal line orthogonal to the virtual line L is referred to as a grating angle. When a signal is accurately recorded or reproduced, the irradiation area of the main beam (7) is large and the irradiation area of the sub-beams (70) (70) is small.
Beams reflected from each bit X, Y, Z (7) (70) (70)
Is detected in the pickup (2) to detect that the irradiation area of the main beam (7) is large, and it can be understood that the beam accurately traces bits on the disk. pick up
If (2) moves correctly along the imaginary line L, the pickup (2) records or reproduces a signal while keeping the irradiation area of the main beam (7) large. When the beams (7), (70), and (70) deviate from the bits X, Y, and Z due to the eccentricity of the disk, the lens (21) is moved to the virtual line L in the pickup (2).
Each reflected beam (7)
(70) While detecting the light amount of (70), the irradiation position is set to the irradiation position of FIG. This operation is a well-known tracking servo.

However, as shown in FIG. 8 (b), when the pickup (2) moves along the virtual line L1 shifted from the virtual line L, the position where the grating angle θ3 is constant and the position shifted from the original position is irradiated. Therefore, the area where the sub beams (70) and (70) irradiate the bits X and Z is reduced. In this case, since the reflected light beams of the sub-beams (70) (70) are low in intensity and cannot be accurately detected, the tracking servo does not work, and it may be difficult to accurately reproduce the signal. Therefore, the center of the disk is arranged on the virtual line L1 which is the transition path of the lens (21), thereby eliminating the phase shift of the reproduction signal and enabling the tracking servo operation, thereby reproducing the signal accurately.

(Features of Temporary Fixing Screw) The temporary fixing screw (9) has the tip of the driver (96) inserted into the head. However, since the temporary fixing screw (9) is generally formed of iron, the driver ( In many cases, the temporary fixing screw (9) is lifted and carried by magnetic attraction after magnetizing (96). However, the temporary fixing screw (9) has a compression spring (90).
When the temporary fixing screw (9) is lifted, the compression spring (90) may fall off. For this reason, in the related art, as shown in FIG. 10, a washer (95) for receiving the lower end of the compression spring (90) is sometimes provided, but the number of components has increased. In this example, the diameter of the round shaft (94) is smaller than that of the large-diameter shaft (91) of the conventional temporary fixing screw (9), so that the inner diameter of the compression spring (90) to be fitted is smaller. Become smaller. As the compression spring (90) is reduced in size, the weight is reduced. In view of this point, the applicant has set the compression spring (90) to a magnetic material,
Specifically, if it is made of steel material such as piano wire, the driver
Compression spring (90) with temporary fixing screw (9) by magnetic force of (96)
The compression spring (90) was conceived not to fall out of the temporary fixing screw (9). As a result, workability when screwing the temporary fixing screw (9) is improved, and the washer (96) is not required, so that the number of components can be reduced.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a rear view of a disk recording or reproducing apparatus.

FIG. 2 is a cross-sectional front view of FIG. 1 cut along a plane including line AA.

FIG. 3 is an exploded perspective view of a bracket and a chassis, showing a mounting state of the bracket.

FIG. 4 is a side sectional view of the bracket of FIG. 1 as viewed from a direction F, and shows a threaded portion of a temporary fixing screw.

FIG. 5 is a perspective view of an eccentric pin.

FIGS. 6A and 6B are side sectional views showing a state where an eccentric pin is fitted into a positioning hole of a chassis through a bracket.

FIG. 7 is an enlarged plan view showing a state of displacement of a normal line.

FIGS. 8A and 8B are enlarged plan views showing bits on a disk, wherein FIG. 8A shows a normal position and FIG. 8B shows a state of a normal line shift.

FIG. 9 is a perspective view of another temporary fixing screw.

FIG. 10 is a perspective view of a conventional temporary fixing screw.

FIG. 11 is a rear view of a conventional disk recording or reproducing apparatus.

FIG. 12 is a perspective view of a conventional disk recording or reproducing apparatus.

[Explanation of symbols]

 (1) Chassis (2) Pickup (3) Cartridge (4) Turntable (6) Guide shaft (8) Bracket (18) Positioning hole (21) Lens (84) Through hole (90) Compression spring (96) Driver

Claims (3)

[Claims] 1. A turntable (4) concentrically fitted on a disk (D) on a chassis (1), and a lens (21) for emitting a beam on a signal surface of the disk (D). It comprises a pickup (2) provided so as to be able to move and a guide shaft (6) for guiding the movement of the pickup (2), and a turntable (4) is mounted on the chassis (1) on the chassis (1). Chassis with bracket (8)
(1) On the bracket (8), the bracket (8) is horizontally moved in a direction orthogonal to the direction along the guide shaft (6), and the transition path of the lens (21) along the guide shaft (6) is set on the turntable (4). ) Is provided at the center of the bracket (8), and the adjusting mechanism (5) is screwed into the chassis (1) through a through hole (84) formed in the bracket (8). And a temporary fixing screw (9) fitted with a spring (90) for urging the bracket (8) toward the chassis (1), the temporary fixing screw (9) Of the screw (9) with the chassis (1)
A disc recording or reproducing apparatus characterized in that a portion where (0) is fitted and passes through the bracket (8) is formed to have substantially the same diameter. 2. The disk according to claim 1, wherein the spring is formed of a magnetized material, and is fitted to the temporary fixing screw and attracted by a driver whose end is magnetized. Recording or playback device. 3. A temporary fixing screw for movably attaching the bracket (8) along the chassis (1) by providing a spring (90) for urging the bracket (8) against the chassis (1), The screwing portion with the chassis (1) and the portion where the spring (90) fits are formed to have substantially the same diameter. The spring (90) is formed of a magnetized material, and the driver ( Temporary fixing screw provided for suction in 96).