JPH04113524A - Supporter for driving lens - Google Patents

Abstract

PURPOSE:To improve the productivity of the supporter for driving lens by arranging focus coils while dividing them in an optical axis direction, and providing a protruding member for fixing a repeating substrate between the respective focus coils. CONSTITUTION:Focus coils 2 for driving an objective lens in the optical axis direction are arranged while being divided in the optical axis direction, and a protruding member 7 is provided to fix an intermediate substrate 8 between these divided focus coils 2. Therefore, the repeating substrate 8 can be easily positioned and since the surface state of the protruding part 7 can be fixed, the fixing state can be made constant as well. Thus, the productivity of the supporter for driving lens equipped with the repeating substrate can be improved.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a lens driving support for supporting an objective lens used in an optical pickup device used for recording and reproducing information on an information recording medium such as an optical disk. It's about the body.

[Conventional technology]

Conventionally, in optical pickup devices, in order to control the condensing position of the light beam that is irradiated onto an information recording medium such as an optical disk through the objective lens in the focus direction and the radial direction, the objective lens is configured to have two axes. A driving lens driving support is used.

For example, as shown in FIG. 5, such a lens driving support 51 is provided with a holder 53 having a substantially rectangular parallelepiped shape, and a substantially cylindrical objective lens 52 is provided approximately at the center of this holder 53. Furthermore, a pair of recesses 63 are provided at both ends of the holder 53 in the longitudinal direction, substantially symmetrically with respect to the objective lens 52.

On the other hand, the objective lens 52 is provided on the outer peripheral surface of the holder 53.
A focus drive coil 60 is wound so as to be coaxial with the concave portion 63, and a pair of radial drive coils wound in an annular shape are arranged on each outer peripheral surface of the focus drive coil 60 facing the recess 63. 62 and 62 are lined up along the focus drive coil 60 and fixed to each other.

Furthermore, one surface of approximately rectangular parallelepiped-shaped relay boards 59 and 59 is fixed to each of the longitudinal wings of the holder 53 around which the focus drive coil 60 is wound. , and the axis of symmetry of the objective lens 52 are set to be on the same plane.

On the other hand, on both end surfaces of each relay board 59, 59 in the optical axis direction of the objective lens 52, which is the vertical direction in the figure, one end of each of a pair of opposing elastic members 54, 54 in the focus direction in the form of plate wings is provided. is installed. These pairs of focus direction movable elastic bodies 54 are arranged in parallel so that their elongated directions are perpendicular to the radial direction indicated by arrow A in the figure, and each other end is connected to an intermediate support 55 having a substantially rectangular parallelepiped shape. It is attached parallel to both ends.

Furthermore, one end of a radially movable elastic body 56 in the form of a leaf spring is similarly attached to both end side surfaces of the intermediate support body 55 . A total of two radially movable elastic bodies 56, 56 are
The legs are spread apart and each other end is attached to each support member 58 , which is erected on the surface of the fixed support 57 .

On the other hand, each of the recesses 63 is provided on the surface of the fixed support 57.
・Substantially rectangular parallelepiped-shaped magnets 61, 61 to be inserted into the magnets 63 are respectively erected, and approximately rectangular parallelepiped-shaped magnets 64, 64 are also erected at the same positions with the focus drive coil 60 sandwiched between these magnets 61, 61. has been done.

In this way, in the above configuration, each drive coil 60, 62,
...and the driving force of each magnet 61, 61, 64, 64, and each movable elastic body 54, 56, the objective lens 5
The objective lens 5
2 is biaxially driven in the focus direction and the radial direction.

[Problem to be solved by the invention]

However, in the above configuration, the focus drive coil 60
In order to fix each relay board 59 directly to the outer peripheral surface of
It has the following three drawbacks.

(2) It is difficult to position the relay board 59. ■Tools are required for accurate positioning. (2) Since the focus drive coil 60 and the relay board 59 are fixed by adhesive, the state of the bonding surface may change depending on how the focus drive coil 60 is wound, and the bond strength between them is not constant.

In addition, the same drawback as described above is caused by the focus drive coil 60.
This also occurs due to the adhesive fixation between the radial drive coils 62 and each radial drive coil 62 .

Therefore, it takes time to accurately and reliably fix each relay board 59 and each radial drive coil 62 to the focus drive coil 60, resulting in a problem that it is difficult to improve the productivity of the lens drive support. ing.

[Means for Solving the Problems] Therefore, in order to solve the above problems, the lens driving support according to claim 1 of the present invention includes an objective lens that focuses a light beam on an optical recording medium; an objective lens holder having a focus coil that drives the objective lens in the direction of the optical axis of the light beam; and a radial coil that drives the objective lens in a direction perpendicular to the optical axis; In a lens drive support body in which a holder is held via a relay board provided on the objective lens holder, the focus coils are arranged divided in the optical axis direction, and there is a space between each focus coil. The relay board is characterized in that a protruding member is provided to fix the relay board.

Further, the lens driving support according to claim 2 of the present invention is:
In order to solve the above problems, we have developed an objective lens that focuses a light beam on an optical recording medium, a focus coil that drives the objective lens in the direction of the optical axis of the light beam, and a focus coil that drives the objective lens in the direction of the optical axis of the light beam. A lens driving support that is equipped with an objective lens holder having a radial coil that is driven in a right angle direction, and in which the objective lens holder is held via a relay board provided on the objective lens holder. In,
The focus coil is divided and arranged in the optical axis direction, and an upright member for fixing the radial coil is provided between each focus coil.

[Function] According to the configurations of claims 1 and 2 above, when fixing the relay board and the radial coil, both of them can be attached to the protruding member and the upright member, respectively, without using any tool for positioning them. By using the fixing member, positioning can be easily and accurately performed, and since one of the fixing surfaces can be fixed instead of the conventional focusing coil surface, the fixing strength is also more constant. It can be done.

As a result, it is possible to improve the productivity of the lens driving support.

[Example] An example of the lens drive support according to the present invention will be described below with reference to FIGS. 1 to 4.

As shown in FIG. 3, the lens drive support includes a substantially rectangular substrate 14. As shown in FIG. A substantially cylindrical opening 14a through which a light beam passes through an objective lens 16, which will be described later, is provided in the substantially central portion of the substrate 14. Further, a pair of substantially rectangular parallelepiped-shaped magnets 1 are provided on this substrate 14 so as to face each other in the longitudinal direction of the substrate 14 with the opening 14a in between.
5 and 15 are erected, and each magnet 1
Magnets 17 and 17 facing each other at a predetermined distance radially outward in the opening 14a are respectively erected with respect to the magnets 15 and 15.
A magnetic field is created between them.

On the other hand, as shown in FIG. 1, a substantially rectangular parallelepiped-shaped drum (objective lens holder) 1 has a substantially cylindrical objective lens mounting portion 1 that holds the objective lens (not shown) at approximately the center thereof.
A pair of recesses 18, 18 having a U-shaped cross section are provided in the longitudinal direction of the drum 1, substantially symmetrically with each other sandwiching the objective lens mounting portion 1a. Further, on the outer circumferential surface of the drum 1, focus direction drive coils 2 are wound in two parts, one in the optical axis direction of the objective lens mounting part 1a and the other in the front axis direction.

Then, on the outer circumferential surface of the drum 1 sandwiched between the focus direction drive coils 2, 2, ribs 3, 3 are arranged on the outer circumferential surface of both ends in the longitudinal direction at approximately the same height as the focus direction drive coils 2, respectively. , Furthermore, each rib 3・
A pair of substantially prismatic dowels (erected members) 5 are erected at predetermined intervals on 3 to fit and insert radial direction drive coils 4, which will be described later. There is.

Further, on the outer circumferential surface of the drum 1 sandwiched between the focus direction drive coils 2, 2, a substantially rectangular parallelepiped shape is provided at the center of each of the outer circumferential surfaces of both longitudinal wings at approximately the same height as the focus direction drive coil 2. A pair of substantially cylindrical protrusions (projecting members) 7 are provided on each of the fixing tables 6, 6 at a predetermined interval to mount a relay board 8, which will be described later. ... are arranged respectively.

The aforementioned relay board 8 is formed into a substantially rectangular shape, and its length in the longitudinal direction is made to be approximately equal to the height in the optical axis direction of the outer peripheral surface of the drum 1 around which the focus direction drive coil 2 is wound. has been done. In addition, each of the above convex portions 7 and
A substantially circular hole 9 and a substantially semicircular notch are formed with a portion 9a so as to fit into the hole 9.

On the other hand, locking portions 8b... are provided on each of the relay boards 8, 8 at both ends in the longitudinal direction, and each drive coil 2 is provided adjacent to each locking portion 8b...・
Connection terminals 8a... are provided to connect the terminals 4... to a control circuit (not shown), and each of these connection terminals 8a...
. . . are electrically connected to the corresponding locking portions 8b . . . within each relay board 8.

Furthermore, as shown in FIG. 2, the aforementioned pair of annular radial direction drive coils 4 are fixedly attached by fitting their inner circumferential surfaces into each of the dowels 5, respectively. Moreover, each of the above-mentioned relay boards 8 and 8 are respectively fitted to each of the above-mentioned fixing bases 6 and 6, and each of the holes 9 and each notch part 9a and 9a are respectively fitted into the corresponding convex parts 7 and 7. As a result, the locking portions 8b, 8b on the relay boards 8, 8 are respectively disposed in the optical axis direction.

The drum 1 described above, as shown in FIGS. 3 and 4,
Each recess 1B, 1 corresponds to each magnet 15, 15, respectively.
8, a total of 4 leaf springs 1
2..., each plate spring 12... is held on the substrate 14 by a drum support member 13 formed on the other end side. That is, since the drum 1 is held in a four-joint link by each leaf spring 12, the optical axis of the objective lens 16 is maintained perpendicular to the recording surface of the recording medium (not shown). The drum 1 is held so as to be movable in the focus direction and the radial direction.

In addition, each drive coil 2, 4... is connected to a connecting terminal 8.
a... are connected to a control circuit (not shown) via the locking portions 8b... and the plate springs 12... As a result, the drum 1 equipped with the objective lens 16 is driven by the control signals from the control circuit to each of the drive coils 2, 4... and each of the magnets 15, 15,...
A magnetic circuit formed by 17 and 17 is driven and controlled in the focus direction and the radial direction.

In this way, in the above configuration, the objective lens 16, which functions as a support for lens driving, is moved in the focus direction and the radial direction, as in the conventional case! IJ can be controlled.

By the way, in the past, each relay board and each radial coil were directly fixed to the outer circumferential surface of the focus direction drive coil, making it difficult to position them, and special tools were required to do so. The way the drive coil is wound is not always constant, and the condition of its surface is also not constant, making the state of its fixation unstable.

However, in the above configuration, each relay board 8
・Each protrusion 7... is provided in 8, and each dowel 5... is provided in each radial coil 4... so that each dowel 5... is fitted, so when fixing them, use a special tool. These positions can be easily performed without using the above, and furthermore, the accuracy of these positions can be improved.

Also, one of the fixed surfaces is not the coil surface as in the past,
By making the fitting surface more stable in surface condition, the bonding condition thereof can also be made more stable.

Therefore, with the above configuration, the assembly work of the lens driving support becomes easier than before, the assembly time is shortened, and the performance of the assembled lens driving support becomes more constant. Furthermore, fewer tools are used during assembly operations.

As a result, productivity can be improved in manufacturing the lens drive support.

Note that the shape of each dowel 5... and convex portion 7... is not limited to the shape of the above configuration, and each radial direction drive coil 4... and each relay board 8, 8 can be accurately shaped. You can use any shape as long as you can position it.

[Effects of the Invention] As described above, in the lens drive support according to claim 1 of the present invention, the focus coil for driving the objective lens in the optical axis direction is divided and arranged in the optical axis direction. is,
The configuration is such that a protruding member for fixing the relay board is provided between each of the divided focus coils.

As a result, the relay board can be easily positioned, and since the surface condition of the protrusion can be kept constant, the fixing condition thereof can also be kept constant.

As a result, it is possible to improve the productivity of the lens driving support provided with the relay board.

As described above, in the lens driving support according to claim 2 of the present invention, the focus coil for driving the objective lens in the optical axis direction is divided and arranged in the optical axis direction,
The configuration is such that an upright member for fixing the radial coil is provided between each of these focus coils.

Thereby, the radial coil can be easily positioned, and since the surface condition of the erected member can be kept constant, the fixing condition thereof can also be kept constant.

As a result, it is possible to improve the productivity of the lens driving support body including the radial coil.

FIG. 3 is a perspective view of the drum in a state where the coil is fixed.

FIG. 3 is a side view of a lens drive support body on which the drum of FIG. 2 is installed.

FIG. 4 is a front view of the lens drive support in FIG. 3.

FIG. 5 shows a conventional example, and is a perspective view of a lens driving support.

■ is a drum (objective lens holder), 2 is a focus direction drive coil, 4 is a radial direction drive coil, 5 is a dowel (
7 is a convex portion (projecting member), and 8 is a relay board.

Patent applicant Sharp Corporation

[Brief explanation of drawings]

1 to 4 show one embodiment of the present invention. FIG. 1 is a perspective view of the drum showing the fixing portions of the relay board and the radial coil. Figure 2 shows the relay board and radia in Figure 1.

Claims (1)

[Claims] 1. An objective lens that focuses a light beam on an optical recording medium;
The objective lens holder is provided with a focus coil that drives the objective lens in the optical axis direction of the light beam, and the objective lens holder is held via a relay board provided on the objective lens holder. In the lens driving support body, the focus coil is arranged divided in the optical axis direction, and a protruding member for fixing the relay board is provided between each focus coil. Support for lens drive. 2. An objective lens that focuses the light beam on an optical recording medium;
A lens drive support body comprising an objective lens holder having a focus coil that drives the objective lens in the direction of the optical axis of the light beam, and a radial coil that drives the objective lens in a direction perpendicular to the optical axis. A support for lens driving according to the present invention, wherein the focus coil is divided and arranged in the optical axis direction, and an upright member for fixing the radial coil is provided between each of the focus coils.