JPH0351779Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a structure for adjusting the mounting state of an optical pickup used in digital audio disks (DAD), video disks, etc., and for reading data on the disk using light.

[Background Art] Optical pickups generally emit laser light to a disk having pits, and detect data, focus errors, and tracking errors on the disk from the intensity and intensity distribution of the reflected light. There is.

The width of this pit is approximately 1 μm, and in order to detect accurate data and errors, it is necessary to fine-tune the mounting condition of the optical pickup in advance.

However, in the conventional optical pickup installation adjustment structure, the focus adjustment, tangential adjustment, and radial adjustment interfere with each other, making it difficult to adjust, or fixing them with screws to prevent the adjustment points from shifting after adjustment. If necessary, the existence of a slight play at the fulcrum of the optical pickup causes rattling and vibration, which makes the adjustment point unstable, and the structure is complex, causing high production costs.

[Purpose of the invention] Taking the above facts into consideration, the present invention provides a mounting state for a pick-up that has a simple configuration, is easy to adjust, does not require fixing the adjustment point with a screw after adjustment, and does not cause the adjustment point to become unstable due to vibration. The aim is to obtain a coordinating structure.

[Structure of the invention] The mounting state adjustment structure for an optical pickup according to the invention includes an optical pickup and a first support member that rotatably supports the optical pickup around an axis parallel to the tangential direction of the disk track. a second support that supports the first support so as to be rotatable around an axis parallel to the radial direction of the disk and movable in a direction perpendicular to the disk surface; a first regulating means for adjusting the rotation angle of the body; a second regulating means for adjusting the rotation angle and movement range of the second support; and the first regulating means. Pressing the first support, and
and an elastic body that brings the first support body into pressure contact with the second regulating means.

[Embodiment of the invention] An embodiment of the structure for adjusting the mounting state of an optical pickup according to the invention will be described with reference to the drawings.

As shown in FIG. 1, an optical pickup 10 emits a laser beam to a disk 12 on which pits are formed, and detects data on the disk from the intensity and intensity distribution of the reflected light from the disk, focusing errors and tracking errors. is detected, converted into an electrical signal, and output. This laser light is emitted from a reaction laser built into the optical pickup 10, is focused by an objective lens 14, and is directed onto the recording surface of the disk with a diameter of approximately 1.6 μm.
It has come to form a light spot. The width of the pit is 0.8 μm, and in order to detect accurate data and errors, it is necessary to finely adjust the mounting condition of the optical pickup in advance.

This adjustment can generally be divided into focus adjustment, tangential adjustment, and radial adjustment. Focus adjustment here refers to the focus direction, that is, the direction perpendicular to the disk surface (Fig. 2A).
The tangential direction refers to the adjustment of the position of the disk 12 in the track tangential direction (the first direction).
Radial adjustment refers to the adjustment of the angle θ ₁ (see Figure 3) with respect to the radial direction of the disk 12 (direction C in Figure 1) (see Figure ₂ ). This is an adjustment.

FIG. 4 shows an exploded perspective view of this adjustment structure, and FIG. 9 shows an assembled perspective view. As shown in FIGS. 4 and 9, a locking plate 16 is fixed to the optical pickup 10, which is pivotally supported by a first support 18, which is further supported by a second support 20. It's becoming like that.

A terminal block 22 (see FIG. 5) is screwed to the side surface of the optical pickup 10, and a locking plate 16,
Substrates 17, 19, 2 of first supports 18 and 20
Lead wires with sockets (not shown) can be attached and removed from the outside through long holes 24, 26, and 28 drilled in 1. Locking plate 16
is fastened to the side of the optical pickup 10 with screws 30. The long hole 24 is rectangular, but the long hole 24 is rectangular.
The shapes of 6 and 28 are further provided with notches 26A and 28A on opposite sides in the longitudinal direction of this rectangle, and even after all the components shown in FIG. 4 are assembled (see FIGS. 5 and 6), It is possible to tighten the screw 30 through these notches 26a and 28A.

the locking plate 16 and the substrate 17 of the first support body 18;
Arms 32A and 32B are provided at both longitudinal ends of 19.
, 34A and 34B are respectively erected in parallel. These arms 32A, 32B have screws 36.
Screw holes 38A and 38B for A and 36B are bored. In addition, holes 42A and 42B for inserting sleeves 40A and 40B are formed in arms 34A and 34B. Sleeve 40 to holes 42A, 42B
A, 40B are inserted, and the screws 36A, 36B pass through the sleeves 40A, 40B and enter the screw holes 38.
It is designed to be screwed together with A and 38B. Therefore, the optical pickup 10 is rotatable about its longitudinal axis. (See FIG. 9) The substrates 17 and 1 are arranged so that the regulating plates 44 and 46 face the locking plate 16 and the first support body 18, respectively.
It is erected on the long side of 9. A screw 50 is screwed into a screw hole 48 formed in the regulation plate 46, passes through the regulation plate 46, and comes into contact with the regulation plate 44, thereby regulating the rotation angle of the optical pickup 10.

A screw 52 is provided around the elongated hole 26 of the first support body 18.
Threaded holes 54A to 54D for A to 52D are bored. Corresponding to the screw holes 54A to 54D, the second
Long holes 56A to 56D are provided in the substrate 21 of the support body 20.
is drilled. The long holes 56A to 56D have play with respect to the sleeves 58A to 58D. This play exists only in the direction of FIG. 4A for the elongated hole 56A, and the other elongated holes 56B to 56D also have play in the direction orthogonal thereto. Sleeves 58A to 58 to long holes 56A to 56D
D is inserted, and the screws 52A to 52D pass through the sleeves 58A to 58D to form the screw holes 54A to 54.
It is designed to be screwed together with D. The presence of the play allows the first support 18 to move in a plane parallel to the substrate 21.

Threaded holes 64A and 64B are threaded into a surface 62 of the second support body 20 that is perpendicular to the substrate 21.
The screws with holes 66A, 66B are screwed into these holes 64A, 64.
B, penetrates through, and comes into contact with the regulating plate 46 of the first support 18, thereby regulating the movement range of the first support 18 in the direction A in FIG. 4.

A hole 67 is bored in the surface 62 to prevent the head of the screw with a hole 50 from coming into contact with the surface 62, and to keep the head of the screw with a hole 50 protruding from the hole 67 under the surface 62. It can be rotated from any direction using a wrench.

Hook portions 68A, 68B and 70A, 7 are provided on the base plate 17 of the locking plate 16 and the surface 62 of the second support body 20.
0B is formed, and the tension coil spring 7
Both ends of the tension coil spring 72B are hooked on the hooks 68A and 70A, and both ends of the tension coil spring 72B are hooked on the hooks 68B and 70B. The tension coil springs 72A and 72B both face the direction A in FIG. 4, and their elastic force presses the regulating plate 44 of the locking plate 16 against the tip of the socket screw 50 attached to the first support 18. Then, the regulation plate 46 of the first support body 18 is moved to the second support body 2.
The screws 66A and 66B with holes attached to the screws 66A and 66B are pressed into contact with each other.

Cutouts 74A and 74B are formed in the upper ends of the arms 34A and 34B of the first support body 18, respectively. The hook portions 68A, 68B of the locking plate 16 are loosely inserted into the notches 74A, 74B so that the hook portions 68A, 68B of the locking plate 16 are not interfered with by the first support body. That is, the regulation plate 44 comes into contact with the socket screw 50 before this interference occurs.

A moving means (not shown) is attached to the outside of surfaces 76A and 76B that are erected at both ends of the surface 62 in the longitudinal direction of the second support 20, allowing movement in the direction C in FIG. 4. .

Next, the operation of this embodiment configured as described above will be explained.

Adjustments are usually performed in the order of focus adjustment, tangential adjustment, and radial adjustment. This can occur if the size of the spot of the laser beam focused on the pit surface of the disk is not appropriate, that is, if the focus adjustment is not made to a certain extent, the optical pick-up 1
This is because an output of 0 makes it difficult to perform other adjustments. Since focus adjustment and tangential adjustment are not completely independent, focus adjustment and tangential adjustment must be repeated alternately, but it is usually sufficient to repeat them about two times. Incidentally, if the focus is not significantly deviated, the tangential adjustment may be performed first. For convenience of explanation, radial adjustment will be explained first.

Radial adjustment is performed using a screw with a hole 50 as shown in FIG. When this screw with hole 50 is rotated and moved in the direction A in FIG. 4 against the elastic force of the tension coil springs 72A, 72B, the regulating plate 44 is
The optical pickup 10, which is integrated with the locking plate 16, rotates about the axis passing through the screws 36A and 36B in the direction in which θ ₂ in FIG. 2 increases. At this time, the first support 18 remains stationary. When the socket screw 50 is rotated in the opposite direction, the optical pickup 10 is rotated in a direction in which θ ₂ in FIG. 2 is decreased.

The regulation plate 44 includes a tension coil spring 72A,
The elastic force of 72B brings it into pressure contact with the screw with hole 50, and no screw is required to fix the adjustment point after adjustment. Also, since there is no backlash, the adjustment point will not become unstable due to vibration.

Next, as shown in FIG. 8, focus adjustment is performed by rotating both the socket screws 66A and 66B in the same direction by approximately the same angle, and tangential adjustment is performed by rotating either of the socket screws 66A and 66B. This is done by rotating the .

In this embodiment, the elongated hole 56A is particularly connected to the sleeve 58A.
, there is play only in the A direction, and the long hole 56
The position A is the objective lens 14 of the optical pickup 10.
is located near the position projected onto the substrate 21 of the second support body 20 (if the two positions match, the focus adjustment will hardly shift by performing the tangential adjustment), so the focus adjustment is done using a hole. This is done by rotating the screw 66A first. Rotate the screw with hole 66A and tighten the tension coil spring 72A.
When the arm 34A of the regulating plate 46 is moved in the A direction against the elastic force of the
The objective lens 14 side of the optical pickup 10 moves in the A direction together with the support body 18 and the locking plate 16. When the socket screw 66A is rotated in the opposite direction, the optical pickup 10 is rotated to the objective lens 1.
The 4th side moves in the direction opposite to the A direction. At this time, the locking plate 16 and the optical pickup 10 do not rotate about the axis passing through the screws 36A and 36B with respect to the first support body 18.

Next, when the screw 66B with a hole is rotated and moved in the direction A against the elastic force of the tension coil spring 72B, the arm 34B side of the regulating plate 46 is pushed up in the direction A, and the optical pickup 10 is moved in the same manner as described above.
The arm 32B side moves in the A direction. When the hole screw 66B is rotated in the opposite direction, the arm 32 side of the optical pickup 10 moves in the opposite direction to the A direction. At this time, the locking plate 16 and the optical pickup 10 are attached to the first support body 18 with the screws 36A, 3.
There is no rotation around the axis passing through 6B.

The regulation plate 46 includes a tension coil spring 72A,
Due to the elastic force of 72B, the screws with holes 66A, 66B
No screws are required to secure the adjustment point after adjustment. In addition, since there is no backlash, the adjustment point will not become unstable due to vibration. In this embodiment, since there is no play in the direction B of the elongated hole 56A of the second support body 20 with respect to the sleeve 58A, movement of the first support body 18 in the direction B with respect to the second support body 20 due to vibration is ensured. It is becoming increasingly difficult to do so.

Furthermore, since the direction of the rotation axis (direction B) related to the radial adjustment of the optical pickup 10 is parallel to the moving surface (plane parallel to the substrate 21) related to the focus adjustment and tangential adjustment,
Radial adjustment, focus adjustment, and tangential adjustment are almost completely independent, and adjustment of one hardly shifts the adjustment point of the other, making it easy to adjust the adjustment point.

In this embodiment, the three adjustment screws 50, 66A, and 66B are located on the back side of the optical pickup 10, so that the adjustment using only the assembly shown in FIG. Adjustments can be made easily after attaching this to the main body. In addition, an elastic body that presses the regulation plate 44 to the screw with a hole 50 and a screw with a hole 66A, 66B
The tension coil springs 72A and 72B share the elastic body that is brought into pressure contact with the tension coil springs 72A and 72B, so the structure is particularly simple.

Since the locking plate 16 is integrated with the optical pickup 10, if the structure is formed integrally with the case of the optical pickup 10, there is no need to provide a separate locking plate, and the first support body can directly connect the light. The pick-up can be pivoted.

In FIG. 4, the optical pickup 10 is left in the same position, the locking plate 16, the first support 18,
The second support body 20 may be assembled with the second support body 20 rotated 90 degrees in a plane perpendicular to the direction A. In this case, the hole screw 50 corresponds to tangential adjustment, and the hole screw 66A and 66B corresponds to focus adjustment and radial adjustment.
Furthermore, the angle is not limited to 90 degrees, but may be any angle.

[Effects of the invention] According to the mounting state adjustment structure of the optical pickup according to the invention, the radial adjustment, the focus adjustment, and the tangential adjustment are almost completely independent, and the adjustment of one will affect the adjustment point of the other. There is almost no deviation and adjustment is easy.

In addition, since the optical pickup is brought into pressure contact with the first regulating means using the elastic body, and the first support body is brought into pressure contact with the second regulating means, the adjustment points can be fixed with separate screws after adjustment. This is not necessary, and the adjustment point does not become unstable due to vibration.

Furthermore, this structure allows the installation state of the optical pick-up to be adjusted with the simple configuration described above, and since the three adjustment screws are located on the back side of the optical pick-up, this assembly
Adjustments can be made easily even when the unit is attached to the main body.

Therefore, from these reasons, the number of parts and the number of man-hours can be reduced, and productivity costs can be reduced, which is an excellent effect.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the positional relationship between the optical pickup and the disk, Figure 2 is a front view of Figure 1, and Figure 3 is a front view of Figure 1.
The figures are a left side view of Fig. 1, Fig. 4 is an exploded perspective view showing an embodiment of the optical pickup mounting adjustment structure according to the present invention, Fig. 5 is a plan view of the assembled state shown in Fig. 4, and Fig. 6
The figure is a right side view of FIG. 5. Fig. 7 is a sectional view taken along the line A-A in Fig. 5, Fig. 8 is a front view of Fig. 5 with one part cut away, and Fig. 9 is an assembled perspective view of the mounting adjustment structure of the optical pickup. . 10... Optical pick-up, 16... Locking plate, 1
8...First support, 20...Second support, 4
4... Regulation plate (first regulation means), 46... Regulation plate (second regulation means), 50... Hole screw (first
(restricting means), 66A, 66B... Screw with hole (second regulating means), 72A, 72B... Elastic body (tension coil spring).

Claims (1)

[Scope of utility model registration request] an optical pickup; a first support supporting the optical pickup rotatably about an axis parallel to the tangential direction of the disk track; a second support member that is rotatable in the direction of the disc surface and movably supported in the vertical direction with respect to the disk surface; a first regulating means for adjusting the rotation angle of the first support member; a second regulating means for adjusting the rotation angle and movement range of the second supporting body; the first supporting body is brought into pressure contact with the first regulating means;
and an elastic body that presses the first support member against the regulating means of the optical pickup.