JPH0561818U - Magnet holding structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The positioning protrusion and the substantially cross-shaped groove of the magnet are fitted to automatically determine the magnet mounting position and polarity, and the magnet mounting work is performed easily and securely. In order to improve the work, the excessive adhesive for adhesive fixation is absorbed by the substantially cruciform groove. [Structure] A horizontal positioning protrusion 2a provided on a side surface 2c of a holding member 2 for holding a magnet 3 which constitutes a magnetic circuit for driving an actuator portion of an optical recording / reproducing device, and a horizontal position perpendicular to the horizontal positioning protrusion 2a. The vertical positioning protrusions 2b are arranged, and substantially magnet-shaped grooves 3a, 3b, which fit into the horizontal and vertical positioning protrusions 2a, 2b, are provided on the predetermined polarity side of the magnet 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnet holding structure which constitutes a magnetic circuit of an optical recording / reproducing apparatus, and more particularly to a magnet holding structure suitable for positioning the magnet holding.

[0002]

[Prior art]

 Conventionally, many magnet holding structures shown in FIGS. 5 to 7 have been provided as the magnetic holding structures constituting the magnetic circuit of the optical recording / reproducing apparatus. FIG. 5 is a perspective view showing a state in which a magnet is incorporated in a holding member and attached to a holding base, FIG. 6 is an exploded perspective view showing a main part of the holding member and a magnet, and FIG. 7 is another conventional example. FIG. 3 is an exploded perspective view showing a main part of the holding member and the magnet.

In the figure, reference numeral 1 denotes a holding base that constitutes a magnetic circuit, and two substantially U-shaped portions are provided near both sides of a light beam hole 1a through which an optical beam of the holding base 1 passes, as shown in the figure. Holding member 1
0 is attached, and the magnet 11 is fixed inside the holding member 10.

As shown in FIG. 6, the holding member 10 is provided with two protrusions 10c at the left and right ends of a substantially U-shaped side face 10a for positioning the magnet 11 in the horizontal direction, and further for holding the bottom of the holding member 2. A protrusion 10d for vertically positioning the magnet 11 is provided on the surface 10b, and the magnet 11 can be positioned by being attracted to the holding member 10 by the magnetic force of the magnet 11.

Further, when the magnet 11 is attracted to the holding member 10, in order to match the polarities of the magnet 11, the polarity indicating marking 11 a provided on the magnet 11 is attracted to the magnet 11 by being attracted to the outside as shown in FIG. The magnet 11 was firmly fixed to the holding member 10 by the adhesive applied to the inside of the magnet 11.

Further, in another conventional example shown in FIG. 7, the vertical positioning protrusion 12b of the magnet 11 is provided only on the bottom surface 12a of the holding member 12, and the magnet 11 is polarized and bonded and fixed by an adhesive as described above. I was able to do it.

[0007]

[Problems to be solved by the device]

 However, the conventional magnet holding structure shown in FIG. 6 has a drawback that the die manufacturing structure of the two protrusions 10c provided at the left and right ends of the holding member 10 becomes complicated and the manufacturing cost becomes high. In the other conventional example of FIG. 7, the manufacturing cost is low because there are no protrusions 10c at the left and right ends, but the magnet 11 cannot be mounted and positioned in the left and right directions, and the skill level of the operator is required. there were.

As described above, the technique for attaching the magnet 11 is required. For example, when the positioning error of the magnet 11 occurs, the operation failure of the actuator part occurs, and the focus and tracking sensitivity due to the twisting of the operating position of the actuator part occurs. There was a problem that defects occurred.

In addition, since the magnet 11 is assembled with the polarity indicating mark, it is necessary to perform the marking work of the magnet 11, and further, an excessive amount of the adhesive for bonding and fixing the magnet 11 flows out to the outside. There was also the drawback that removal work was required to remove the adhesive.

The present invention has been made in view of the above-mentioned points, and an object thereof is to solve the drawbacks of the conventional example, and to fit the horizontal and vertical positioning protrusions and the substantially ten-shaped groove provided on the magnet. The magnet mounting position and polarity can be automatically determined when the magnet is attached, and the magnet mounting work can be performed easily and surely to improve the mounting work, and extra adhesive for adhesive fixing can be used. The purpose of the present invention is to provide a magnet holding structure that can be absorbed by the substantially cruciform groove provided in the.

[0011]

[Means for Solving the Problems]

 The magnet holding structure of the present invention constitutes a magnetic circuit for driving an actuator portion having an optical lens for controlling a light beam of an optical recording / reproducing apparatus, and a magnet holding structure for fixing a magnet to a substantially U-shaped holding member. In the above, the horizontal positioning protrusion provided on the side surface of the holding member, the vertical positioning protrusion disposed at a position perpendicular to the horizontal positioning protrusion, and the horizontal and vertical positioning protrusions on the predetermined polarity side of the magnet. It is configured by providing a substantially cross-shaped groove that fits in.

Further, the vertical positioning protrusion may be arranged on the bottom surface of the holding member, and a vertical groove may be provided on the side of the holding member, which is fitted to the horizontal positioning protrusion, on the side of the magnet having a predetermined polarity. ..

[0013]

[Action]

 According to this invention, a horizontal positioning protrusion for fixing the magnet is provided on the side surface of the holding member for holding the magnet, and a vertical positioning protrusion for vertically positioning the magnet is provided at a position perpendicular to the horizontal positioning protrusion. , A substantially cruciform groove is provided on a predetermined polarity side of the magnet, and the substantially cruciform groove is fitted to the horizontal and vertical positioning protrusions, so that the sticking and positioning of the magnet can be easily determined. In this positioned state, the magnet can be adhesively fixed to the holding member by the adhesive applied to the magnet.

As another structure of the invention, the vertical positioning protrusion for fixing the magnet may be arranged on the bottom surface of the holding member to perform the vertical positioning of the magnet. Furthermore, the magnet may be predetermined. By providing a vertical groove on the side of the specified polarity and by fitting the vertical groove of this magnet to the horizontal positioning protrusion on the side surface of the holding member, horizontal positioning for fixing the magnet can be easily performed. The magnet may be adhered and fixed to the holding member by the adhesive applied to the magnet.

Moreover, it is possible to prevent the adhesive from flowing out to the outside by absorbing an excessive amount of the adhesive applied to the magnet by the substantially cross-shaped groove or the vertical groove provided in the magnet of the invention. it can.

As described above, the plurality of protrusions on the holding member and the substantially cross-shaped groove or the vertical groove provided on the magnet can easily perform accurate positioning, and the magnetic circuit of the actuator portion can be reliably formed. be able to.

[0017]

【Example】

 An embodiment of a magnet holding structure according to the present invention will be described with reference to FIGS. The same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. 1 is a perspective view showing a state in which a magnet is incorporated in a holding member and attached to a holding base, FIG. 2 is a side view, FIG. 3 is a perspective view showing a holding member and a magnet, and FIG. 3B is a perspective view of a magnet, FIG. 4A is a perspective view of a holding member of another embodiment, and FIG. 4B is a perspective view of a magnet of another embodiment. ..

In the figure, reference numeral 2 is a holding member formed in a substantially U shape, and two horizontal and vertical positioning protrusions 2a and 2b are provided on a side surface 2c of the holding member 2, and 3 is a magnet. 3, a substantially cruciform vertical groove 3a and a horizontal groove 3b are provided on the predetermined polarity side.

In another embodiment of FIG. 4, reference numeral 4 is a holding member formed in a substantially U shape, and a horizontal positioning protrusion 2 a is provided on a side surface 4 c of the holding member 4 and is perpendicular to a bottom surface 4 d of the holding member 4. A positioning protrusion 2b is provided, and numeral 5 is a magnet, and a vertical groove 5a is provided on a predetermined polarity side of the magnet 5.

In the magnet holding structure thus configured, the holding member 2 can be attached and fixed to the holding base 1 at a predetermined position, for example, by screwing, caulking, or using an adhesive together. .. Horizontal and vertical positioning protrusions 2a and 2b are generated at the same time when the press die is processed so as to project inside the side surface 2c of the fixed holding member 2. The horizontal and vertical positioning protrusions 2a and 2b are as shown in the figure. It is formed by being placed at a right angle.

On the other hand, the magnet 3 fixed to the holding member 2 is provided with a substantially cross-shaped vertical groove 3a and a horizontal groove 3b on the predetermined polarity side as shown in the figure, and the magnet 3 has a substantially cross-shaped vertical groove. 3a fits on the horizontal positioning protrusion 2a of the holding member 2 to position the magnet 3 horizontally, and the substantially cross-shaped lateral groove 3b of the magnet 3 fits on the vertical positioning protrusion 2b of the holding member 2. The magnets 3 can be positioned vertically by combining them, and the magnets 3 are temporarily fixed to a predetermined position of the holding member 2 by the attracting force of the magnets 3, and the magnets 3 are bonded by the adhesive applied to the magnet 3 at the time of main bonding. It can be fixed, and the excess adhesive at the time of this fixing by adhesion can be prevented from flowing to the outside by the substantially cross-shaped grooves 3a and 3b provided in the magnet 3 serving as flow paths.

In this way, the assembled two substantially U-shaped holding members 2 are formed in the vicinity of the light beam passage hole 1a of the holding base 1 with the magnet 3 fixed, and the two holding members 2 An actuator section (not shown) having an objective lens is mounted between the two, and a magnetic circuit is formed between the coil mounting surface of the actuator section and the magnet 3 fixed to the holding member 2. This magnetic circuit can operate normally to control the focus and tracking of the light beam.

The above-mentioned position adjustment and fixing accuracy of the magnet 3 that is adhesively fixed to the holding member 2 can be performed by adjusting the width and depth of the substantially cross-shaped grooves 3a and 3b of the magnet 3, and the like. The flow rate treatment of the excess adhesive can be adjusted by the above-mentioned substantially cross-shaped grooves 3a, 3b, and the magnetic polarization direction of this magnet 3 is also determined by the processing surface of the substantially cross-shaped grooves 3a, 3b. The polarity can be easily determined and implemented.

In another embodiment shown in FIG. 4, reference numeral 4 is a holding member formed in a substantially U shape, and a horizontal positioning protrusion 4a is provided on a side surface 4c of the holding member 4, and a bottom surface 4d of the holding member 4 is provided. A vertical positioning protrusion 4b is provided, and numeral 5 is a magnet, and a vertical groove 5a is provided on a predetermined polarity side of the magnet 5.

The vertical groove 5a of the magnet 5 is fitted into the horizontal positioning protrusion 4a of the holding member 4 configured as described above to perform horizontal positioning, and the vertical position of the vertical positioning protrusion 4b causes the vertical position of the magnet 5 to rise. Directional positioning can be performed, and the excess adhesive when the adhesive is fixed by the adhesive can be absorbed in the vertical groove 5a.

The horizontal and vertical positioning protrusions 4a and 4b of the holding member 4 can be formed, for example, in a straight line as shown in the figure, and can be manufactured at the same time when the holding member 4 is manufactured by a press die, and the magnet 5 The vertical groove 5a can be processed with only one vertical groove 5a.

As described above, the convex shape of the horizontal and vertical positioning protrusions 2a, 2b or 4a, 4b is formed into a shape that can be pressed, such as a hemispherical shape or a prismatic shape, which facilitates manufacturing and reduces manufacturing cost. be able to.

[0028]

[Effect of the device]

 As described above, the magnet holding structure according to the present invention facilitates accurate and accurate positioning of the magnet by the horizontal and vertical positioning protrusions provided on the holding member and the substantially cross-shaped groove provided on the magnet 5. This has the effect of making it easier to assemble the magnet.

As described above, since the magnet can be fixed easily and accurately, the twisting operation of the actuator portion due to the inclination of the magnet is eliminated, and the fluctuation of the light beam's focus and tracking sensitivity can be eliminated. ..

Further, since the magnetizing property of the magnet can be judged by the substantially cross-shaped groove or the like into which the magnet is fitted, the polarity display mark by the immortal ink as in the conventional example is unnecessary, and when the magnet is bonded and fixed. There is also an effect that it is possible to prevent the surplus adhesive from being absorbed into the substantially cruciform groove or the like and flowing out.

Moreover, it has excellent features such as a simple structure and easy implementation because it can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnet holding structure according to the present invention.

FIG. 2 is a side view showing an example.

3A and 3B are perspective views of a holding member and a magnet of an embodiment, FIG. 3A is a perspective view of the holding member, and FIG. 3B is a perspective view of the magnet.

FIG. 4 is a perspective view of a holding member and a magnet of another embodiment, FIG. 4 (A) is a perspective view of the holding member, and FIG. 4 (B) is a perspective view of the magnet.

FIG. 5 is a perspective view showing a state in which a magnet of a conventional example is incorporated in a holding member and attached to a holding base.

FIG. 6 is an exploded perspective view showing a main part and a magnet of a conventional holding member.

FIG. 7 is an exploded perspective view showing a main part and a magnet of another conventional holding member.

[Explanation of symbols]

 1 Holding base 1a Light beam hole 2 Holding member 2a Horizontal positioning protrusion 2b Vertical positioning protrusion 2c Side 2d Bottom 3 Magnet 3a Vertical cross-shaped groove 3b Horizontal cross-shaped groove

Claims (2)

[Scope of utility model registration request] 1. A magnet holding structure for forming a magnetic circuit for driving an actuator portion having an objective lens for controlling a light beam of an optical recording / reproducing apparatus, wherein a magnet is fixed to a substantially U-shaped holding member. A horizontal positioning protrusion provided on a side surface of the member, a vertical positioning protrusion disposed at a position perpendicular to the horizontal positioning protrusion, and a substantially polarizable side of the magnet that is fitted to the horizontal and vertical positioning protrusions. A magnet holding structure characterized by having a V-shaped groove. 2. The vertical positioning protrusion is disposed on the bottom surface of the holding member, and a vertical groove is formed on the side of the holding member on the side of the holding member on which the vertical positioning protrusion is fitted. The magnet holding structure according to claim 1.