JP2000021040A - Power feeding structure for magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power feeding structure for a magnetic head, which is capable of simplifying the structure of feeding power from a magnetic head driving circuit to the magnetic head, assembling within a short time and reducing costs. SOLUTION: Ends of power feeding suspensions 105a and 105b constituting a magnetic head 101 are connected to a coil 103, the other ends thereof are interpolated and held in a fixing member 107, and extended as power feeding members 1a and 1b along the backside of the fixing member 107 to the bottom surface thereof. The power feeding members 1a and 1b are guided to specified positions in the lower surface of a resin spring 3 by guide grooves 2a and 2b. The fixing member 107 is fixed to an optical base such that the power feeding members 1a and 1b are connected to power feeding patterns from a magnetic head driving circuit formed on the optical base. Thus, power is fed to the coil 103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of irradiating a light spot of a semiconductor laser with a lens and irradiating an external magnetic field to record information on a recording layer of a magneto-optical disk or to record information recorded in advance on a recording layer. The present invention relates to a power supply structure of a magnetic head used in a magneto-optical disk device for reproducing / erasing.

[0002]

2. Description of the Related Art FIG. 5 is a configuration diagram showing a power supply structure of a conventional magnetic head.

[0005] A conventional technique will be described with reference to FIG.

In FIG. 5, reference numeral 101 denotes a magnetic head, 10
Reference numeral 2 denotes a magnetic core constituting a magnetic field generating unit of the magnetic head 101, and 103 denotes a coil. 104 is a load beam, 1
05a and 105b are suspensions, 106a and 106
b is a terminal portion, 107 is a fixing member, 108 is a power supply FPC,
109a and 109b are positioning pins, 110 is an optical base, 111 is an optical element group, 112a and 112b are positioning holes, 113 is screw holes, 114 is a magnetic head drive circuit,
Reference numeral 115 denotes a fixing screw. The coupling configuration of the magnetic head and the optical head configured as described above and the power supply structure between the magnetic head and the magnetic head drive circuit will be described in detail below.

[0005] The magnetic head 101 comprises a magnetic core 102, a coil 103, a load beam 104, and suspensions 105a and 105b. The load beam 104 is made of a resin material, and suspensions 105a and 105b are inserted into the load beam 104. Suspension 105a, 105b
Holds a magnetic core 102 and a coil 103 as a magnetic field generating unit via a load beam 104. One end of each of the suspensions 105a and 105b is a coil 10
3 and the other end is inserted and held by a resin-molded fixing member 107 and
7, terminal portions 106a and 106b are formed at predetermined positions. In other words, the suspensions 105a and 105b hold the magnetic field generating portions and simultaneously hold the terminal portions 106a and 106b.
Also has a function of supplying power to the coil 103. On the lower surface of the fixing member 107, the fixing member 107 is
Positioning pins 109a, 1 for positioning at predetermined positions
09b is provided.

On the other hand, the optical base 110 is
1 is disposed at a predetermined position, and positioning holes 112a and 112b for positioning the fixing member 107 are provided. The coupling between the magnetic head 101 and the optical base 110 is performed by positioning pins 109 a and 109 of the fixing member 107.
b is fitted into the positioning holes 112a and 112b of the optical base 110, and the screws 115 are screwed into the screw holes 113 of the optical base 110. Power is supplied from the magnetic head drive circuit 114 to the coil 103 using the power supply FPC 10.
8 is soldered to the terminal portions 106a and 106b of the fixing member 107.

[0007]

However, in the conventional power supply structure for a magnetic head, in order to supply power from the magnetic head drive circuit to the magnetic field generating section of the magnetic head, the power supply FPC 108 from the magnetic head drive circuit and the fixed member are provided. It is necessary to solder the terminal portions 106a and 106b.

Therefore, there is a problem that it takes time to assemble the magnetic head. In addition, since power is supplied from the magnetic head drive circuit to the terminals by the power supply FPC, there is a problem that the cost is increased.

In view of the foregoing, it is an object of the present invention to provide a magnetic head power supply structure which simplifies the power supply structure of a magnetic head, enables assembly in a short time, and realizes low cost. I do.

[0010]

The present invention has the following configuration to achieve the above object.

That is, a power supply structure for a magnetic head according to the present invention includes a magnetic head having a magnetic field generator and a power supply member for the magnetic field generator, and a drive current supply means for supplying a drive current to the magnetic head. An optical base on which an optical element is arranged and a power supply pattern for guiding the output of the drive current supply means to the power supply member is disposed; and a fixed member coupled to the optical base and holding the magnetic head. The power supply member extends to a joint of the fixed member with the optical base, and the power supply pattern and the power supply member are electrically connected by positioning and fixing the fixed member to the optical base. A contact is formed, and power can be supplied from the drive current supply unit to the magnetic field generation unit.
According to the present invention, the above configuration eliminates the need for a power supply FPC which is conventionally required for supplying power from the magnetic head drive circuit to the magnetic head. For this reason, the soldering work between the power supply FPC and the magnetic head power supply contact can be reduced, and the number of assembling steps can be reduced and the structure can be simplified. Thus, it is possible to reduce the product cost.

In the above configuration, it is preferable that the power supply member has a function of supplying power to the magnetic field generation unit and a function of holding the magnetic field generation unit. According to such a preferred configuration, it is not necessary to separately provide a member for exerting the power supply function and a member for exerting the suspension function, so that the number of parts is reduced, the assembly work is simplified, and the structure is reduced. Can be simplified, and the cost can be reduced.

In the above configuration, it is preferable that the fixing member has a guide groove for guiding the power supply member to a power supply pattern arranged on the optical base on a coupling surface with the optical base. According to this preferred configuration, if the fixing member is fixed to the optical base while the power supply member is fitted in the guide groove, the electrical connection between the power supply member and the power supply pattern can be formed. That is, the work of positioning the power supply member when the fixing member is fixed can be simplified, and the assembling time is reduced.

In the above configuration, it is preferable that the fixing member has a resin spring member that presses the power supply member to the power supply pattern when the fixing member is positioned and fixed to the optical base. According to such a preferred configuration, a good electrical connection between the power supply member and the power supply pattern can be maintained, and a highly reliable power supply structure can be realized with a simple structure.

In the above configuration, it is preferable that the optical base is made of a metal member.
According to such a preferred configuration, the rigidity of the structure formed by integrally connecting the magnetic head and the optical element is improved, and the mechanical properties such as earthquake resistance are improved.

Further, in the above configuration, it is preferable that the optical base has an insulating film in a region other than a region where the electric contact is formed, in contact with the power supply member. According to this preferred configuration, it is possible to prevent direct contact between the power supply member and the member forming the optical base, so that even if the optical base is a conductive member, the magnetic head drive circuit connects to the coil. A short circuit between the power supply member and the optical base can be prevented before power is supplied. Note that the insulating film may be formed at least in a region where the power supply member contacts, but by forming the insulating film in a wider region including the region, short-circuiting may occur even in the event of misalignment. This is preferable because generation can be reliably prevented.

Further, in the above configuration, it is preferable that the positioning of the power supply member with the power supply pattern is performed by a positioning pin provided on the fixed member or the optical base. According to this preferred configuration, the power supply member is held at the predetermined position when the fixing member is fixed to the optical base, so that the working efficiency is improved. In addition, the power supply member can be accurately positioned on the power supply pattern contact point of the optical base without special consideration, and the direct contact between the power supply member and the member forming the optical base is reliably prevented, A short circuit during power supply from the magnetic head drive circuit to the coil can be reliably prevented, and the practical effect is large.

[0018]

(First Embodiment) FIG. 1 is a diagram showing a schematic configuration of a structure including a magnetic head and a fixing member constituting a power supply structure of a magnetic head according to a first embodiment of the present invention. Yes, (A) is a plan view, (B) is a side view,
(C) is a bottom view, and (D) is a rear view. FIG. 2 is an exploded perspective view showing an optical base and an optical element group constituting a power supply structure of the magnetic head according to the first embodiment of the present invention.

The first embodiment of the present invention will be described with reference to FIGS. The following description focuses on newly added components as compared with the configuration of the power supply structure of the conventional magnetic head of FIG. 5, and the same reference numerals are given to members common to FIG. 5, and detailed description thereof will be omitted.

5, 1a and 1b are power supply members, 2a and 2b are guide grooves, 3 is a resin spring, 4 is a metal optical base, 5a ,
5b is a wiring pattern arranged on the optical base 4.

The configuration will be described below with a focus on newly added components.

In the conventional magnetic head power supply structure, the terminal 1
The power supply from the magnetic head drive circuit 114 to the coil 103 is enabled by soldering the FPCs 06a and 106b and the power supply FPC 108 from the magnetic head drive circuit 114. In the first embodiment, as shown in FIG.
Power supply members 1a and 1b, which are extended suspensions 105a and 105b, are newly provided. The power supply members 1a, 1b
The guide grooves 2a and 2a are arranged along the back surface of the fixing member 107 and provided on the bottom surface of the fixing member 107.
b. The guide grooves 2a and 2b guide the power supply members 1a and 1b to predetermined positions on the lower surface of the resin spring member 3 provided on the fixing member 107. The lower surface of the resin spring 3 has a slightly raised portion as shown, and when the fixing member 107 is fixed so that its lower surface is in close contact with the optical base 4, the raised portion is formed by the elastic force of the resin spring 3. Is configured to be in close contact with the surface of the optical base 4 at a predetermined pressure.

On the other hand, as shown in FIG. 2, a magnetic head driving circuit 114 is provided on the optical base 4 formed of a metal member.
The power supply patterns 5a and 5b from (not shown) are arranged at predetermined positions on the optical base 4. The power supply patterns 5a and 5b are provided with positioning pins 10 in positioning holes 112a.
9a and positioning pin 109b in positioning hole 112b.
When each is inserted and positioned, the power supply member 1a and the power supply pattern 5a form a power supply contact (electrical contact) on the lower surface of the resin spring 3, and the power supply member 1b and the power supply pattern 5b connect the power supply contact (Electrical contacts). By fixing the fixing member 107 and the optical base 4 with screws 115, the resin spring 3 presses the power supply members 1a and 1b against the power supply patterns 5a and 5b with a predetermined pressing load, thereby stably holding the power supply contact. This enables power to be supplied from the magnetic head drive circuit 114 to the coil 103.

With the above configuration, the power supply FPC for supplying power from the magnetic head drive circuit to the magnetic head can be eliminated, the cost can be reduced by reducing the number of parts, and the number of soldering steps between the power supply FPC and the magnetic head power supply contact can be reduced. Simplification of the assembly structure and cost reduction can be realized by the reduction.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described.

FIG. 3 is a configuration diagram showing a power supply contact portion constituting a power supply structure of the magnetic head according to the second embodiment. In the drawing, solid lines indicate members on the optical base 4 side, and broken lines indicate members on the fixed member 107 side (magnetic head 101 side).

Embodiment 2 of the present invention will be described with reference to FIG. The first embodiment will be described with a focus on newly added components, and members common to FIGS. 1 and 2 will be assigned the same reference numerals and detailed description thereof will be omitted.

The newly added 6a and 6b are insulating films. In the first embodiment, the power supply members 1 a and 1 b guided by the guide grooves 2 a and 2 b on the bottom surface of the fixed member 107 and the power supply patterns 5 a and 5 b form and hold power supply contacts by pressing the resin spring 3. However, since the optical base 4 is formed of a metal member, the power supply members 1a and 1b
It is assumed that short-circuiting occurs when the magnetic head drive circuit 114 supplies power to the coil 103 due to direct contact with the optical base 4 at the bottom surface of the reference numeral 07. Therefore, in the second embodiment, the insulating coatings 6a and 6b in a region larger than the projection surface of the power supply members 1a and 1b are provided on the optical base 4 side in the region where the power supply members 1a and 1b are located on the bottom surface of the fixing member 107. Provide.

Thus, direct contact between the power supply member and the member forming the optical base is prevented, and a short circuit between the power supply member and the optical base during power supply from the magnetic head drive circuit to the coil is prevented. be able to.

Third Embodiment Next, a third embodiment of the present invention will be described.

FIG. 4 is a configuration diagram showing a power supply contact portion constituting a power supply structure of the magnetic head according to the third embodiment. In the drawing, solid lines indicate members on the optical base 4 side, and broken lines indicate members on the fixed member 107 side (magnetic head 101 side).

The third embodiment of the present invention will be described with reference to FIG. Embodiment 2 will be described mainly with respect to newly added components, and members common to FIG. 3 will be assigned the same reference numerals and detailed description thereof will be omitted.

In the third embodiment, in order to accurately position the power supply members 1a and 1b with respect to the wiring patterns 5a and 5b, the power supply members 1a and 1b are provided with holding members 7a and 7b made of the same material. The holding members 7a and 7b have openings 7a 'and 7b', respectively.
By inserting the positioning pins 109a and 109b into the a 'and 7b', respectively, the power supply members 1a and 1b are positioned and held at predetermined positions. In this state, the fixing member 107
Is positioned and fixed to the optical base 4. As a result, the power supply members 1a and 1b are accurately guided and positioned at predetermined positions of the power supply patterns 5a and 5b. As shown,
The guide grooves 2a, 2b on the bottom surface of the fixing member 107 are formed in a predetermined groove shape according to the shape of the holding members 7a, 7b.
The insulating films 6a and 6b formed on the optical base 4 are:
The holding members 7a and 7b are formed according to the shapes of the holding members 7a and 7b so as to prevent the holding members 7a and 7b from directly contacting the members forming the optical base 4.

As described above, by positioning the power supply member using the positioning pin of the fixing member, the power supply member can be held at a predetermined position of the fixing member with high positional accuracy when the fixing member is fixed to the optical base. Therefore, it is not necessary to perform the assembling work while checking the alignment between the power supply member and the wiring pattern, and the working efficiency is improved.
Also, by simply inserting the positioning pins 109a and 109b into the positioning holes 112a and 112b and fixing them with the screws 115, the power supply member is accurately positioned on the contact point of the power supply pattern on the optical base. In addition, the direct contact between the power supply member and the member forming the optical base can be reliably prevented, and a short circuit can be reliably prevented when power is supplied from the magnetic head drive circuit to the coil.

In the above configuration, the positioning pins 109a and 109b may be formed on the optical base 4 side, and the positioning holes 112a and 112b may be formed on the fixing member 107 side. In this case, the openings 7a ', 7b' of the holding members 7a, 7b are connected to the positioning pins 109 of the optical base 4.
a, 109b while the fixing member 10
What is necessary is just to position and fix 7 on the optical base 4. In this case, similarly, when the fixing of the fixing member 107 to the optical base 4 is completed, the power supply members 1 a and 1 b
a, 5b are accurately positioned at predetermined positions.

[0036]

As described above, according to the power supply structure of the magnetic head of the present invention, the power supply FPC, which is conventionally required for supplying power from the magnetic head drive circuit to the magnetic head, becomes unnecessary. For this reason, the soldering work between the power supply FPC and the magnetic head power supply contact can be reduced, and the number of assembling steps can be reduced and the structure can be simplified. Thus, it is possible to reduce the product cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a structure including a magnetic head and a fixing member that constitute a power supply structure of a magnetic head according to a first embodiment of the present invention; FIG.
(B) is a side view, (C) is a bottom view, and (D) is a rear view.

FIG. 2 is an exploded perspective view showing an optical base and an optical element group constituting a power supply structure of the magnetic head according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a power supply contact portion constituting a power supply structure of a magnetic head according to a second embodiment of the present invention;

FIG. 4 is a configuration diagram illustrating a power supply contact portion forming a power supply structure of a magnetic head according to a third embodiment of the present invention;

FIG. 5 is a configuration diagram showing a power supply structure of a conventional magnetic head.

[Explanation of symbols]

 1a, 1b Power supply member 2a, 2b Guide groove 3 Resin spring member 4 Optical base 5a, 5b Power supply pattern 6a, 6b Insulating film 7a, 7b Holding member 101 Magnetic head 102 Magnetic core 103 Coil 104 Load beam 105a, 105b Suspension 107 Fixed Member 109a, 109b Positioning pin 111 Optical element group 112a, 112b Positioning hole 113 Screw hole 114 Magnetic head drive circuit 115 Fixed screw

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hirotoshi Tomita 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsumi Goto 1006 Okadoma Kadoma Kadoma City Osaka Pref. (72) Inventor Yutaka Murakami 1006 Kadoma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Osamu 1006 Kadoma Odaka, Kadoma City, Osaka Pref. CF10

Claims (7)

[Claims] A magnetic head having a magnetic field generating unit and a power supply member to the magnetic field generating unit; a driving current supplying unit for supplying a driving current to the magnetic head; an optical element; An optical base on which a power supply pattern for guiding the output of the means to the power supply member is disposed; and a fixed member coupled to the optical base and holding the magnetic head, wherein the power supply member is provided on the optical member of the fixed member. The power supply pattern and the power supply member form an electrical contact by positioning and fixing the fixing member to the optical base, and extend from the drive current supply unit. A power supply structure for a magnetic head, wherein power can be supplied to the magnetic field generator. 2. The power supply structure for a magnetic head according to claim 1, wherein the power supply member has a function of supplying power to the magnetic field generation unit and a function of holding the magnetic field generation unit. 3. The magnetic head according to claim 1, wherein the fixing member has a guide groove for guiding the power supply member to a power supply pattern arranged on the optical base, on a coupling surface with the optical base. Power supply structure. 4. The magnetic head according to claim 1, wherein the fixing member has a resin spring member that presses the power supply member against the power supply pattern when the positioning member is positioned and fixed to the optical base. Power supply structure. 5. The power supply structure for a magnetic head according to claim 1, wherein the optical base is made of a metal member. 6. The power supply structure for a magnetic head according to claim 1, wherein the optical base has an insulating film in a region other than a region where the electric contact is formed, where the power supply member contacts. 7. The power supply structure for a magnetic head according to claim 1, wherein positioning of the power supply member with a power supply pattern is performed by a positioning pin provided on the fixed member or the optical base.