JPH0654541B2 - Position adjusting device for optical components for optical disk device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical disc reproducing apparatus or a recording / reproducing apparatus.

[Prior Art] A conventional adjusting device will be described with reference to Figs. Fig. 5 is an exploded perspective view of a conventional adjusting device, Fig. 6 is a view showing the movable holder shown in Fig. 5, Fig. 7 is a sectional view of Fig. 6, and Fig. 8 is VIII- of Fig. 7. It is a VIII sectional view. In these drawings, 1 is a cylindrical movable holder, 2 is a regular hexahedron prism, 3 is a disk-shaped lens, 4 is a fixed holder, and 5 is an eccentric driver for moving the movable holder 1 in the direction of arrow A. , 6 are set screws for fixing the movable holder 1 to the fixed holder 4 after the adjustment is completed.

Next, the operation will be described.

After the movable holder 1 to which the prism 2 and the lens 3 are fixed is inserted and fitted into the fixed holder 4, the eccentric driver 5 is formed so as to penetrate from the predetermined portion of the outer wall of the upper surface of the fixed holder to the accommodating portion of the movable holder 1. Position of the prism 2 and the lens 3 in the fixed holder 4 by rotating the eccentric driver 5 in the direction B and moving the movable holder 1 in the direction of arrow A. Make adjustments. After adjustment,
The movable holder 1 is fixed to the fixed holder 4 with the set screw 6. Thus, in this type of position adjusting device, the movable holder 1 to which the prism 2 and the lens 3 are fixed is inserted into the fixed holder 4, and reaches the movable holder 1 from outside the fixed holder 4, such as the eccentric driver 5. The position of the movable holder is adjusted from the outside via the position adjusting member.

[Problems to be solved by the invention]

In the conventional adjusting device, since the movable holder 1 has the shape shown in FIG. 5 to FIG. 8 (hereinafter referred to as an alligator type), the alligator tends to spread in the direction of arrow C in FIG. Therefore, it was difficult to secure the accuracy of the outer diameter of the movable holder 1. That is, the prism 2 and the lens 3 are attached to the movable holder 1.
If it is attached to, there is a problem that the outer diameter becomes large and it cannot be inserted into the fixed holder 4 or cannot be adjusted in the arrow A direction. Further, since the movable holder is of an alligator type, the prism 2 and the lens 3 are
There is also a problem in that it takes a lot of work to mount these while accurately maintaining the relative positional relationship of the.

This invention has been made to solve the above problems, and can be positioned independently by simply inserting a regular hexahedron prism and a disk-shaped lens into a predetermined portion of the movable holder, Moreover, it is an object of the present invention to provide an adjusting device in which the relative positional relationship between these two and the outer diameter dimension of the movable holder are ensured with high accuracy, and the movable holder can move stably in the fixed holder.

[Means for solving problems]

In the position adjusting device for an optical component for an optical disk device according to the present invention, a circular recess for accommodating a disk-shaped lens is formed on one bottom surface of a cylindrical movable holder, and a constant interval is provided from the circular recess. A hexagonal prism is housed in a substantially middle portion of the cylindrical movable holder, and a notch is formed for positioning the apex of the hexahedral prism by abutting three shared surfaces. However, the cylindrical outer peripheral surface of the movable holder main body is left over the entire circumference between the notch and the circular recess.

[Action]

In the present invention, a disk-shaped lens is inserted into a circular concave portion formed on one bottom surface of a cylindrical movable holder, and the circular concave portion is formed at regular intervals in the longitudinal direction of the movable holder. Hexagonal prisms are fitted into the cutouts, and the cylindrical outer peripheral surface of the movable holder body is left between the cutouts and the circular recesses over the entire circumference. The lens and the hexahedral prism can be easily positioned at a predetermined position in the movable holder.
Even if the lens and the prism are housed, the rigidity of the movable holder is maintained, and the outer diameter of the movable holder does not change.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 is a perspective view showing an adjusting device according to an embodiment of the present invention, FIG. 2 is a perspective view of a movable holder of the present embodiment, FIG.
FIG. 4 is a sectional view of the movable holder. In the figure, 2
6 are the same as the conventional device. Reference numeral 7 denotes a movable holder, which has a cylindrical shape and has a circular recess for inserting the lens on one bottom surface thereof, and the cylindrical middle portion is independent of the recess. A prism having a hexahedron shape has a notch having a shape having three surfaces that abut on three surfaces sharing one apex of the prism so that the center line of the prism and the center line of the movable holder coincide with each other.

In the apparatus of the present embodiment, the movable holder 7 having the prism 2 and the lens 3 mounted therein is inserted and fitted into the fixed holder 4, and the position of the movable holder 7 is adjusted by rotating the eccentric driver 5 as in the conventional apparatus. However, at this time, the movable holder 7
Since the circular concave portion and the cutout portion are separately provided as described above, the lenses and the prisms can be accurately positioned by simply inserting and inserting them, respectively, and
The cylindrical holder is not deformed as in the conventional case, and the lens and the prism are accurately positioned as described above. Therefore, the movable holder stabilizes in the fixed holder without hindering the movement of the movable holder. It can slide and move.

In the above-described embodiment, the movable holder has been described as having one prism and one lens fixed, but a plurality of movable holders may be fixed.

〔The invention's effect〕

As described above, according to the present invention, the circular concave portion is formed on one bottom surface of the cylindrical movable holder that is moved in the fixed holder, and the disk lens is fitted and inserted into the circular concave portion. A notch is formed in the middle of the cylindrical movable holder, which is spaced at a constant distance from the above, so that the apex of the hexahedral prism to be housed abuts the shared three surfaces to position it. Then, a hexahedral prism is fitted therein, and the cylindrical outer peripheral surface of the movable holder main body is left over the entire circumference between the cutout portion and the circular concave portion. The lens can be easily positioned at a predetermined position in the movable holder simply by inserting the lens and the hexahedral prism, and the rigidity of the movable holder is maintained even if the lens and the prism are housed. Dimension change It is possible to prevent, as a result,
The movable holder slides smoothly in the fixed holder, and the positions of the lens and the prism can be easily adjusted with high accuracy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an adjusting device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a movable holder of this embodiment,
3 and 4 are sectional views of the movable holder, FIG. 5 is an exploded perspective view showing a conventional adjusting device, FIG. 6 is a perspective view showing a conventional movable holder, and FIGS. It is sectional drawing of this movable holder. In the figure, 2 is a prism, 3 is a lens, 4 is a fixed holder, and 7 is a movable holder. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Nakano 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Prefecture Itami Works, Sanryo Electric Co., Ltd. (56) References: 59-145727 Actual opening 59-104333 (JP, U) Actual opening 59-41312 (JP, U) Actual opening 59-46308 (JP, U) Actual opening 47-33708 (JP, Y1)

Claims (1)

[Claims] 1. A cylindrical movable holder in which a disk-shaped lens and a hexahedral prism are housed, and a cutout groove is formed in a part of an outer peripheral surface thereof in a direction perpendicular to a longitudinal direction thereof. And a cylindrical accommodating portion for fitting and accommodating the movable holder, and a through hole penetrating from the outside to the cylindrical accommodating portion. The movable holder is movably held in the accommodating portion. By engaging the fixed holder and the eccentric projection formed at the tip through the through hole with the cutout groove and eccentrically moving the eccentric projection, the movable holder has a longitudinal direction in the accommodation portion of the fixed holder. In the position adjusting device for an optical component for an optical disk device, which is provided with a position adjusting means for adjusting the position of the circular holder, the movable holder has a circular recess into which the disc-shaped lens is fitted on one bottom surface thereof. The hexahedron prism is fitted into a substantially middle portion in the longitudinal direction, and the center line of the prism and the center line of the movable holder in the longitudinal direction are formed only by bringing the prism into contact with three surfaces sharing one apex of the prism. And a notch portion that matches the above are independently formed, and the cylindrical outer peripheral surface of the movable holder main body is left over the entire circumference between the circular recess and the notch portion. Position adjustment device for optical components for optical disk devices.