JPH03218247A - Construction of coil frame of vcm - Google Patents

Abstract

PURPOSE:To improve rigidity and facilitate high speed access by a method wherein a coil wire is wound around a coil frame composed of a plurality of frame components and the frame components are brought into firm contact with each other and fixed. CONSTITUTION:After a first coil frame 5a and a second coil frame 5b are made to touch each other as shown in the figures, a coil wire 20 is wound around the two coil frames while a suitable tension is applied to the wire 20. With this process, the first coil frame 5 and the second oil frame 5b are brought into firm contact with each other by the tension and a coil frame 4 is completed. For that purpose, if the second coil frame 5b which must have a strength is made of metal such as aluminum, the coil and coil frame having high rigidity can be obtained and a resonance caused by an alternate load produced in the coil at the time of ON-track of a carriage can be avoided. Moreover, if the first coil frame 5a required to be light in weight is made of light material such as plastic, the weight of movable components such as a carriage, a coil and an actuator can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coil frame of a VCM, which is a linear motor used in information recording devices called ODDs and HDDs.

[Summary of the Invention] The present invention is characterized in that, in the coil frame of the VCM, two coil frames around which a coil wire is wound are formed, and the coil frames are closely fixed to each other with the coil wire.

[Conventional technology] Conventional type VCM adopted in the information recording device
The structure of the coil frame will be explained below.

Fig. 3 is an assembled plan view of the main parts of an information recording device called ODD, Fig. 4 is an assembled sectional view of Fig. 3, Fig. 5 is Fig. 3,
FIG. 4 is a sectional view taken along the coil line of the VCM coil used, and FIG. 6 is an external perspective view of the coil shown in FIG. 5.

The configuration will be explained. 1 is a main chassis, which is the base of the information recording device. 2 is an outer yoke which is a component of the VCM which is the linear motor attached to the main shaft 1; 3 is a permanent magnet attached to the inside of the outer yoke 2; 4 is a coil; a coil frame 5; a coil wire; It consists of 20. The coil frame 5 is provided with a horizontal hole as shown in FIG. 5, and the coil 4 is attached to the carriage by screwing through the horizontal hole. Fixed at O. The coil 4 is fixed to both sides of the central ridge 10 by the means described above, as shown in FIGS. 3 and 4. Reference numeral 6 denotes a center yoke connected to the outer yoke 2, which is inserted into the center hole of the coil frame 5 with an appropriate gap as shown in FIG. Reference numeral 7 denotes a ball bearing, and as shown in FIG. 4, a pair of ball bearings is assembled, one at the top and one at the bottom, and three pairs of ball bearings are connected to the carriage 10 as shown in FIG.
is set to . A guide rail 9 is combined between the upper and lower ball bearings, and furthermore, the pair of pawl bearings is connected to a carriage 10 by a well-known structure.
This movement causes the carriage 10 to be moved horizontally, and the carriage 10 is held between the two guide rails 9.

A spindle motor 11 is fixed to the main chassis 1, and is capable of holding and rotating a well-known disk 12 at that position. Reference numeral 8 denotes a lens actuator fixed to the carriage 10, which is an objective lens (not shown).
It is possible to move the objective lens up and down in FIG.

The operation will be explained.

The spindle motor 11 rotates, and the disk 1
2 rotates. In the case of an ODD, since the disk 12 is generally made of plastic, the disk 12 has a planar deflection of several tens of microns. The objective lens moves up and down to follow the vibration, and the laser beam passing through the objective lens is focused on a known recording surface of the disk 12. After focusing, the irradiation beam confirms the address recorded on each track of the disk 12, moves to a required track, and records or reproduces information. This movement is caused by the action of the VCM, which is the linear motor, together with the carriage and the jig 10, and this will be explained below.

When a current flows through the coil wire 20, the coil 4 receives a force along the guide rail 9 due to the action of the magnetic lines of force extending from the permanent magnet 3 toward the center yoke 6. The force acts on the carriage 10 via the coil frame 5, and the lens actuator 8 can be moved in either the inner or outer circumferential direction of the disk depending on the direction in which the current flows.

As is well known, the disc 12 has a track cut into it, but the track has eccentricity, bits, etc. due to processing errors and the like.

Since the objective lens provided in the lens actuator 8 must follow such a traverse,
The direction of the current flowing through the coil wire 20 from a control circuit (not shown) is always reversed to cause the beam to accurately follow the track.

[Problems to be Solved by the Invention] In the information recording device, it is necessary to read and write information quickly.
It is necessary that said movement of . In order to move the carriage 10 quickly, the carriage 10
It is also necessary to reduce the weight of the movable parts installed in the vehicle, but it is not only necessary to reduce the weight but also maintain strength. This is because, in order for the objective lens to rack onto the track, it must withstand the alternating load generated by the coil 4, as described above. If the coil frame 5 is bent or resonates due to the alternating load, the function of the ON rack cannot be achieved. but,
In the conventional coil 4, there is a possibility that the influence of this resonance may occur, and if an attempt is made to prevent the occurrence of this resonance, the weight of the coil frame 5 increases or a large space is required, so it is difficult to record the information. There were problems such as the size of the device. Furthermore, when the coil frame 5 is separated into two parts and their joint surfaces are fixed by adhesive or the like, the rigidity of the adhesive part is low and it is difficult to employ the system. The present invention aims to improve these drawbacks and provide a compact information recording device that can be accessed at high speed.

[Means for Solving the Problems] The coil frame structure of the VCM of the present invention includes: 1) a plurality of coil frames around which coil wires are wound; and by winding the coil wires, the plurality of coil frames are It is characterized by a structure that allows it to be fixed in close contact.

2) The material of the one coil frame and the other coil 6 They are characterized by different frame materials.

[Operations] Since the present invention is constructed as described above, for example, the part 5a of the coil frame, which is important for weight reduction rather than strength, is made of plasticine material, and the coil frame, which is important for weight reduction rather than weight reduction, is made of plastic material. The portion 5b of the frame can be made of metal such as aluminum.

By doing so, it is possible to realize a coil frame that is lightweight and strong against the resonance, and achieves high-speed access of the information recording device.

[Example] An example of the present invention will be described in detail with reference to FIGS. 1, 2, and 3.

FIG. 1 is a sectional view showing a coil 4 according to an embodiment of the present invention, FIG. 2 is an external perspective view of FIG. 1, and FIG. 3 is an assembled plan view for explaining the basic operation of the information recording device. The coil 4 is composed of a first coil frame 5as, a second coil frame 5b, and a coil wire 20, as shown in FIG. The first
As shown in the figure, the coil frame 5a has a hole in the center into which the center yoke 6 is inserted, and the coil wire 20 is wound around the outside of the hole, and an ear 5C is provided as a guide for the coil wire. ing. Reference numeral 5b denotes a second coil frame made of aluminum, one end of which has a surface that comes into contact with the first coil frame 5a, and the other end provided with a hole for screwing into the carriage 10. When creating the coil 4, first, the first coil frame 5a and the second coil frame 5b are brought into contact as shown in FIG.
Thereafter, the coil wire 20 is wound around the outside of the two while applying an appropriate tension. Then, due to the tension, the first coil frame 5a and the second coil frame 5b
are tightly adhered to each other, and the coil 4 is completed.

This coil 4 is connected to the carriage 10 in the same way as in the conventional one.
Screw it on and operate it. The basic operation is the same as the conventional one, but even if an alternating load is applied depending on the direction of the current flowing through the coil wire 2o, in the case of the coil according to the embodiment of the present invention, the attachment part to the carriage 10 Since the strength of the second coil frame 5b is high because it is made of aluminum, it is less susceptible to the effects of resonance. Furthermore, the first
Since the coil frame 5a is not affected by resonance because the copper wire is wound on the outside, a plastic material or the like can be used.

Therefore, the total weight of the coil can be reduced, the weight of the movable part can be reduced, the access of the carriage 10 can be made faster, and high-speed operation of the information recording apparatus can be achieved.

Further, in the present invention, since the coil frame 5 is composed of two bodies,
By separating the coil frame 5 having a complicated shape, it is also possible to improve the workability.

In the present invention, the first coil frame 5a is made of plastic and the second coil frame 5b is made of aluminum.However, the materials are not limited to these, and the materials can be reversed if necessary. Alternatively, it is also possible to apply adhesive to the contact surfaces of the first coil frame 5a and the second coil frame 5b to make the bond stronger, and by doing so, the work of winding the coil wire 20 can be improved. becomes easier. It is also possible to combine the two by known two-piece resin molding or insert molding, and then wind a coil wire around the outer periphery of the combination.

[Effects of the Invention] Since the present invention is constructed as described above, the second coil frame made of a strong material is arranged in the parts where strength is required, and the second coil frame made of a strong material is placed in the parts where weight reduction is required rather than strength. By arranging the first coil frame made of a lightweight material and fixing the two in close contact with each other while applying tension when winding the coil wire 20, a highly rigid coil and a coil frame can be secured. Become. For this reason, it is possible to prevent resonance due to the alternating load generated in the coil when the carrying injector 10 is turned on. moreover,
If the first coil frame 5a, which is a part that requires weight reduction rather than strength, is made of a lightweight material such as plastic, it is possible to reduce the weight of movable members such as the carriage rod 10, coils, actuator, etc., resulting in high-speed operation. It becomes possible to provide an information recording device that is possible. In addition, for coil frames with complex shapes, dividing them into two can improve the workability of each coil frame, reducing cost.
− also contributes. In addition, in the past, the coil frame was constructed in one piece to reduce weight, and the wall thickness was thickened to ensure strength, but in this case, the entire fill becomes large, compressing other spaces. Alternatively, the information recording device may become large, or high-speed access may be affected. The present invention eliminates these problems and has many of the effects described above.

[Brief explanation of drawings]

Fig. 1 is a sectional view taken along the coil wire of a coil showing an embodiment of the present invention, Fig. 2 is an external perspective view of Fig. 1, and Fig. 3 is an information recording structure of the present invention and a conventional structure. FIG. 4 is an assembled plan view for explaining the basic operation of the device; FIG. 4 is an assembled sectional view of FIG. 3 in a conventional structure; FIG. Figure 6 is a perspective view of the exterior of Figure 5 Main chassis 2: VCM outer yoke 3: 4 2 5: 5 8: 5 b 2 6: 7: 8: 9: 1 0= 1 1= 1 2= 2 0: Permanent magnet coil of VCM Coil frame 1st coil frame 2nd coil frame VCM center yoke Ball bearing lens Actuator Guide rail Carriage spindle motor disk Coil wire Above Figure 1 Figure 2 20 4

Claims (1)

[Claims] 1) A VCM coil characterized by a structure in which a plurality of coil frames around which a coil wire is wound are formed, and the plurality of coil frames are fixed in close contact with each other by winding the coil wire. frame structure. 2) The VC according to claim 1, wherein the material of the one coil frame and the material of the other coil frame are different.
M coil frame structure.