The present application claims priority under 35 U.S.C. § 119 to Japanese Application No. 2018-052040 filed Mar. 20, 2018, and Japanese Application No. 2018-052041 filed Mar. 20, 2018, the entire contents of both of which are incorporated herein by reference.
At least an embodiment of the present invention relates to a magnetic head comprising a magneto-resistance effect element and a card reader.
A card reader includes a magnetic head structured to perform processing such as reading and writing of magnetic data to a card which is inserted through a card insertion port. Further, a card reader includes a pre-head which is a magnetic head for detecting whether or not magnetic data are recorded on a card inserted into a card insertion port. A control part of the card reader opens a shutter member provided in the card insertion port and drives a conveyance mechanism structured to convey a card when magnetic data recorded on the card are detected based on a detection signal of the pre-head, and the card is taken into the inside and processing such as reading and writing of magnetic data is performed.
The magnetic head includes a magneto-resistance effect element and a case which accommodates the magneto-resistance effect element. The case includes a sensor face on which a card recorded with magnetic data is slid. This type of magnetic sensor is disclosed in Japanese Patent No. 3775296 (Patent Literature 1). In the magnetic sensor in Patent Literature 1, a wiring member (metal wiring body and external connection terminal) connected with a magneto-resistance effect element and a magnet for generating a bias magnetic field are disposed in an inside of a case, and they are sealed in the inside of the case with resin. Further, a ceramic layer (nickel plating layer containing ceramic particles) for enhancing abrasion resistance of a sensor face on which a card is slid is formed on a surface of the case.
A conventional magnetic sensor is structured so that a yoke is disposed in an inside of a case for forming a magnetic path and the magnetic flux is converged at a position of a magneto-resistance effect element for enhancing detection accuracy by the magneto-resistance effect element. However, when a yoke is used, the number of parts is increased and thus the cost is increased and, in addition, assembling works become complicated.
Further, although the magnetic sensor disclosed in Patent Literature 1 is not provided with a yoke, a bias magnetic field is generated by using a magnet. However, in a magnetic head for generating a bias magnetic field by a magnet, a detection output is also generated for a simple metal card. Therefore, a card where magnetic data are recorded and a simple metal card cannot be distinguished and thus, when the above-mentioned magnetic head is used as a pre-head, a metal card where no magnetic data are recorded may be erroneously detected as a card where magnetic data are recorded.
In order to detect magnetic data recorded on a card by a magneto-resistance effect element without using a yoke and a magnet, the magneto-resistance effect element is required to be disposed in a sensor face and a gap between the card and the magneto-resistance effect element is set to be less than several tens of μm. However, in a case that a magneto-resistance effect element is disposed in a sensor face, abrasion and damage of the magneto-resistance effect element may be occurred by contacting of a card with the sensor face and thus durability is deteriorated. In Patent Literature 1, although a ceramic layer having abrasion resistance is provided on the surface of the case, the magneto-resistance effect element is covered by the case covered by the ceramic layer. Therefore, according to this structure, a gap between the magneto-resistance effect element and a card cannot be set sufficiently small and thus a required detection accuracy cannot be secured.
In view of the problems described above, at least an embodiment of the present invention secures detection accuracy of the magnetic head and to restrain deterioration of durability of the magnetic head due to contact with a medium.
In order to attain the above, at least an embodiment of the present invention provides a magnetic head which is structured to detect whether magnetic data are recorded on a medium or not. The magnetic head includes a case formed with an opening part in a sensor face which faces a side where the medium is passed, a protection member which is positioned and disposed in the opening part with the sensor face as a reference, and a magneto-resistance effect element which is disposed in the opening part in a state that at least a part of the magneto-resistance effect element is covered by the protection member.
In at least an embodiment of the present invention, an opening part is formed in a sensor face of a case of the magnetic head, and a magneto-resistance effect element covered by a protection member is disposed in the opening part. According to this structure, although the magneto-resistance effect element is disposed in the opening part of the case so that a gap between a medium and the magneto-resistance effect element is reduced, the magneto-resistance effect element is protected by the protection member. Therefore, damage of the magneto-resistance effect element due to contact of the medium with the sensor face can be restrained and deterioration of the durability is restrained. Further, the protection member is positioned in the opening part with the sensor face as a reference and thus, a distance between the magneto-resistance effect element and the sensor face can be determined by a thickness of the protection member. Therefore, a gap between the magneto-resistance effect element and a medium can be controlled finely, and the gap between the magneto-resistance effect element and the medium can be reduced. Accordingly, the detection accuracy can be secured without using a yoke for guiding magnetic flux to the magneto-resistance effect element. Further, a part cost of a yoke can be eliminated and, in addition, assembling work is also easy.
In at least an embodiment of the present invention, the protection member is made of ceramic. Abrasion resistance of ceramic is high and thus, damage of the magneto-resistance effect element can be restrained and durability of the magnetic sensor can be enhanced. For example, abrasion resistance of hard ceramic such as zirconia is high and thus hard ceramic may be used as a protection member.
In at least an embodiment of the present invention, a first adhesive for fixing the magneto-resistance effect element to the protection member is a hard adhesive, and the first adhesive is spread over a gap space between the protection member and the case, and the first adhesive is spread over a gap space between the magneto-resistance effect element and the case so that the protection member and the magneto-resistance effect element are fixed to the case. According to this structure, each of the protection member and the magneto-resistance effect element can be surely fixed to the case. Further, since a hard adhesive is used as the first adhesive, fixation by the first adhesive can be performed surely and the magneto-resistance effect element can be positioned to the sensor face with a high degree of accuracy. Accordingly, the gap between the magneto-resistance effect element and a medium can be controlled finely and the gap between the magneto-resistance effect element and the medium can be reduced. As a result, detection accuracy can be secured.
In at least an embodiment of the present invention, that an inside of the case is sealed with a second adhesive which is a soft adhesive. When an inside of the case is sealed, a wiring member connected with the magneto-resistance effect element can be protected. Therefore, disconnection and damage of the wiring member can be restrained. Further, in a case that a temperature shock is applied, although stress is applied to the magneto-resistance effect element due to a difference of thermal expansion coefficients of the members, the stress can be relaxed.
In at least an embodiment of the present invention, the case is formed of conductive resin. When the case is made conductive, the case can be grounded and the magneto-resistance effect element can be protected from static electricity. Further, when the case is made of resin instead of metal, a component cost of the case can be reduced.
In at least an embodiment of the present invention, the case is provided with a tube-shaped part and a bottom part which closes one end of the tube-shaped part, and the bottom part structures the sensor face, and an inner face of the tube-shaped part is provided with a fixing part to which a ground line is fixed. According to this structure, the case can be grounded and thus the magneto-resistance effect element can be protected from static electricity.
In at least an embodiment of the present invention, the magnetic head includes a flexible printed circuit board connected with the magneto-resistance effect element, and the ground line is provided in the flexible printed circuit board. According to this structure, a signal line connected with the magneto-resistance effect element and the ground line can be routed together and thus the wiring member can be easily handled at the time of assembling.
Next, at least an embodiment of the present invention provides a card reader including a card insertion part formed with a card insertion port, and a card reader main body having a card conveyance passage connected with the card insertion port and being structured to perform at least one of reading and recording of magnetic data to a card in the card conveyance passage, and the above-mentioned magnetic head is mounted in the card insertion part as a pre-head which is structured to detect whether or not magnetic data are recorded on a card inserted into the card insertion port. According to this card reader, the detection accuracy can be secured without using a yoke in the magnetic head which is mounted as a pre-head and, in addition, deterioration of the durability can be restrained. Further, a component cost of a yoke can be eliminated and assembling work is also easy.
Other features and advantages of the invention will be apparent from the following detailed description, taken in conjunction with the accompanying drawings that illustrate, by way of example, various features of embodiments of the invention.
Embodiments will now be described, by way of example only, with reference to the accompanying drawings which are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several Figures, in which:
A magnetic head 10 and a card reader 1 in accordance with at least an embodiment of the present invention will be described below with reference to the accompanying drawings.
(Card Reader)
In the present specification, three directions, i.e., “X”, “Y” and “Z” are directions perpendicular to each other. The “X” direction is a front and rear direction of the card reader 1. A card 2 is inserted into the card reader 1 to the “X1” direction and is taken out from the card reader 1 to the “X2” direction. In other words, the “X” direction is a conveyance direction for a card 2. The “Y” direction is a width direction of the card reader 1, and one side in the “Y” direction is referred to as “Y1” and the other side is referred to as “Y2”. The “Z” direction is a height direction of the card reader 1 and is a thickness direction of a card 2 inserted into the card insertion port 3. One side in the “Z” direction is referred to as “Z1” and the other side is referred to as “Z2”. In the description of a magnetic head 10 described below, the three directions of “X”, “Y” and “Z” shown in
A card 2 is made of vinyl chloride and its thickness is about 0.7-0.8 mm. As shown in
As shown in
When the control part of the card reader 1 detects that a card 2 is inserted into the card insertion port 3 and, in addition, the control part detects that magnetic data are recorded on the card 2, the control part determines that a card 2 to be processed has been inserted and takes the card 2 into the card conveyance passage 5. In other words, a shutter mechanism not shown provided on a rear side of the card insertion port 3 is operated to open and the conveyance mechanism 8 is driven to convey the card 2 to a position of the magnetic head 7. When the card 2 is passed through the position of the magnetic head 7, a sensor face of the magnetic head 7 slides on a magnetic stripe 2a of the card 2 and processing such as reading and writing of magnetic data is performed.
(Magnetic Head)
As shown in
The magnetic head 10 is provided with a sensor face 11 which is a sliding face on which a card 2 is slid. The sensor face 11 faces a side where a card 2 inserted into the card insertion port 3 is passed (to the “Z1” direction in the arrangement in
As shown in
A tip end of the first portion 51 is formed with a first terminal part 511 which is connected with the magneto-resistance effect element 30. The magneto-resistance effect element 30 is formed in a rectangular shape, and an end part on one side in its longitudinal direction is fixed to a tip end of the first portion 51 where the first terminal part 511 is provided. The second portion 52 is extended in a straight line shape in a direction perpendicular to the first portion 51 as a whole. The second portion 52 is provided with a protruded part 521 which is protruded to one side in a width direction of the first portion 51 and a protruded part 522 which is protruded to the other side in the width direction of the first portion 51, and a second terminal part 523 is formed at a tip end of the protruded part 522. The third portion 53 is connected with a midway portion of the protruded part 522. The third portion 53 is extended in a direction perpendicular to the second portion 52 as a whole, and a width of an end part on a side connected with the protruded part 522 of the second portion 52 is formed to be thin and a width of a portion on an opposite side to the protruded part 522 is formed to be wide. A third terminal part 531 is formed at an end part of the third portion 53 on an opposite side to the second portion 52.
The flexible printed circuit board 50 includes a flexible substrate and a wiring pattern formed on the flexible substrate. As shown in
As shown in
The shape of the flexible printed circuit board 50 shown in
When the magneto-resistance effect element 30 is disposed in the opening part 23 of the case 20, the first portion 51 of the flexible printed circuit board 50 is disposed on an inner side of the cut-out part 24 of the case 20. A width “W2” (see
As shown in
As shown in
(Assembling of Magnetic Head)
The protection member 40 is a ceramic plate, for example, a hard ceramic plate such as zirconia. A thickness of the protection member 40 is a dimension which determines a gap between the magneto-resistance effect element 30 and the sensor face 11 and thus the thickness of the protection member 40 is set to the thickness capable of securing detection accuracy of the magneto-resistance effect element 30. In this embodiment, the thickness of the protection member 40 is set within the range between 30 μm and 50 μm. The protection member 40 may be made of material other than zirconia when abrasion resistance is secured. For example, a nonmagnetic metal plate such as alumina or SUS may be utilized.
When the magnetic head 10 is to be assembled, first, in order to fix the protection member 40 and the magneto-resistance effect element 30 in the opening part 23 of the case 20, a first step is performed in which the protection member 40 is positioned in the opening part 23 with the sensor face 11 as a reference. As shown in
Next, a second step is performed in which a hard adhesive 70 is applied to a face on the “Z2” direction side (to a face on an opposite side to the sensor face 11) of the protection member 40 disposed in the opening part 23. Successively, in a third step, the magneto-resistance effect element 30 is put into the case 20 and fitted to the opening part 23 and the magneto-resistance effect element 30 is placed on the face of the protection member 40 where the hard adhesive 70 has been applied and, as shown in
In this embodiment, the hard adhesive 70 is a low-viscosity adhesive. Therefore, as shown in
Further, the fourth step is performed in a state that the flexible printed circuit board 50 is extended to the outside through the cut-out part 24 of the case 20 and thus the inside of the case 20 can be visually recognized through the cut-out part 24 of the case 20. Therefore, in the fourth step, pressing condition of the magneto-resistance effect element 30 by the pressing pin 13 and the position of the magneto-resistance effect element 30 can be confirmed through the cut-out part 24. Further, in this case, the flexible printed circuit board 50 is prevented from being interfered with the pressing pin 13 in the inside of the case 20.
After the hard adhesive 70 has been hardened, the pressing pin 13 is taken out from the case 20 and a fifth step is performed in which a soft adhesive 60 is injected into the opening part 23 to form a first adhesive layer 61 which covers the magneto-resistance effect element 30. The first adhesive layer 61 fixes the magneto-resistance effect element 30 to the case 20. Successively, a sixth step is performed in which the flexible printed circuit board 50 is returned to the inside of the case 20 and held by the case 20. In the sixth step, as described with reference to
The soft adhesive 60 is thermosetting resin and thus, in the eighth step, the assembled magnetic head 10 is heated and the soft adhesive 60 is hardened. In this case, although not shown in
As described above, in the magnetic head 10 in this embodiment, the opening part 23 is formed in the sensor face 11 which is provided in the bottom part 21 of the case 20 of the magnetic head 10, and the magneto-resistance effect element 30 covered by the protection member 40 is disposed in the opening part 23. According to this structure, although the magneto-resistance effect element 30 is disposed in the opening part 23 of the case 20 so that a gap between the magneto-resistance effect element 30 and a card 2 which is a medium on which magnetic data are recorded is reduced, the magneto-resistance effect element 30 is protected by the protection member 40. Therefore, damage of the magneto-resistance effect element 30 due to contact of the card 2 with the sensor face 11 can be restrained and deterioration of the durability is restrained. Further, the protection member 40 is positioned in the opening part 23 with the sensor face 11 as a reference and thus, a distance between the magneto-resistance effect element 30 and the sensor face 11 can be determined by a thickness of the protection member 40. Therefore, a gap between the magneto-resistance effect element 30 and a card 2 can be controlled finely, and the gap between the magneto-resistance effect element 30 and the card 2 can be reduced. Accordingly, detection accuracy of the magnetic head 10 can be secured without using a yoke for guiding magnetic flux to the magneto-resistance effect element like a conventional magnetic head and the durability can be secured. Further, a part cost of a yoke can be reduced and, in addition, assembling work of the magnetic head 10 is also easy.
Further, the card reader 1 in this embodiment includes the magnetic head 10 described in this embodiment as a pre-head. Therefore, detection accuracy can be secured without using a yoke in the pre-head and the durability can be secured. Accordingly, a cost of the pre-head can be reduced and the durability can be secured. Further, assembling work is also easy.
In this embodiment, a ceramic plate is used as the protection member 40, and the protection member 40 is formed of zirconia which is hard ceramic. Abrasion resistance of ceramic is high and thus, damage of the magneto-resistance effect element can be restrained and the durability of the magnetic sensor can be enhanced.
In this embodiment, the hard adhesive 70 which is a first adhesive for fixing the magneto-resistance effect element 30 to the protection member 40 is a low-viscosity adhesive. Therefore, the hard adhesive 70 is spread over the gap space between the protection member 40 and the case 20 and the gap space between the magneto-resistance effect element 30 and the case 20 and, in this manner, the protection member 40 and the magneto-resistance effect element 30 are fixed to the case 20. Therefore, each of the protection member 40 and the magneto-resistance effect element 30 can be surely fixed to the case 20. Further, mutual fixation of the protection member 40, the magneto-resistance effect element 30 and the case 20 can be surely performed by using the hard adhesive 70. Therefore, the magneto-resistance effect element 30 can be positioned with respect to the sensor face 11 with a high degree of accuracy. Accordingly, the gap between the magneto-resistance effect element 30 and the card 2 can be controlled finely and the gap between the magneto-resistance effect element 30 and the card 2 can be reduced. As a result, detection accuracy can be secured.
In this embodiment, the inside of the case 20 of the magnetic head 10 is sealed with the soft adhesive 60 which is the second adhesive. As described above, when the inside of the case 20 is sealed, the flexible printed circuit board 50 which is a wiring member connected with the magneto-resistance effect element 30 can be protected. Therefore, disconnection and damage of the flexible printed circuit board 50 can be restrained. Further, since the inside of the case 20 is sealed with the second adhesive which is the soft adhesive 60, even in a case that a temperature shock is applied to the magnetic head 10, stress occurred due to a difference of thermal expansion coefficients of the members and applied to the magneto-resistive element can be relaxed.
In this embodiment, the case 20 of the magnetic head 10 is formed of conductive resin. Further, the case 20 is provided with the tube-shaped part 22 and the bottom part 21 which closes one end of the tube-shaped part 22. The bottom part 21 structures the sensor face 11, and the inner face of the tube-shaped part 22 is provided with the fixing part 26 to which the second terminal part 523 which is a terminal of the ground line 55 is fixed. As described above, the case 20 is made conductive and the ground line 55 is fixed to the case 20 with the conductive adhesive and thus the case 20 can be grounded. Therefore, the magneto-resistance effect element 30 can be protected from static electricity, a failure due to static electricity can be restrained. Further, the case 20 is made of resin instead of metal and thus a component cost of the case 20 can be reduced.
In this embodiment, the ground line 55 is provided in the flexible printed circuit board 50 in which the signal line 54 connected with the magneto-resistance effect element 30 is provided. Therefore, the signal line 54 and the ground line 55 can be routed together and thus the wiring member can be easily handled at the time of assembling. Further, the flexible printed circuit board 50 is formed so that the protruded part 522 of the second portion 52 is branched from the first portion 51 where the signal line 54 is provided, and the ground line 55 is provided in the protruded part 522 which is a branched part from the first portion 51. Therefore, positioning of the second terminal part 523 which is a terminal of the ground line 55 to the fixing part 26 and fixing work of the second terminal part 523 to the fixing part 26 can be performed easily.
Further, in a manufacturing method of the magnetic head 10 in this embodiment, when the magneto-resistance effect element 30 is to be fixed to the protection member 40 disposed in the opening part 23 of the case 20 with the hard adhesive 70 which is the first adhesive, the flexible printed circuit board 50 connected with the magneto-resistance effect element 30 is extended to an outer side of the case 20 through the cut-out part 24 formed in the case 20. According to this structure, the flexible printed circuit board 50 in a flexible shape is prevented from disturbing positional confirmation and pressing work of the magneto-resistance effect element 30. Further, when fixing work of the magneto-resistance effect element 30 to the case 20 is to be performed or the like, disconnection and damage of the wiring member can be restrained. In addition, the position of the magneto-resistance effect element 30 in the inside of the case 20 can be confirmed through the cut-out part 24. Further, after the magneto-resistance effect element 30 has been fixed, the flexible printed circuit board 50 can be returned to the inside of the case 20 through the cut-out part 24 of the case 20 and sealed. Therefore, when the magneto-resistance effect element 30 is to be assembled in the case 20 together with the flexible printed circuit board 50 in a flexible shape, workability can be improved. Further, the magneto-resistance effect element 30 can be positioned with a high degree of accuracy and is fixed.
In this embodiment, the flexible printed circuit board 50 is provided with the first portion 51, which is thinner than a width of the cut-out part 24 of the case 20, and the second portion 52 whose width in the same direction of the width of the first portion 51 is wider than the width of the cut-out part 24. In a state that the flexible printed circuit board 50 is extended to the outside of the case 20 by passing the first portion 51 through the cut-out part 24, the magneto-resistance effect element 30 is pressed and performed with fixing work by hardening the hard adhesive 70. Next, the second portion 52 of the flexible printed circuit board 50 is returned to the inside of the case 20 after the fixing work has been performed, and the second portion 52 is hooked and held by the holding part 25 provided in the case 20. In this embodiment, the second portion 52 is provided with the protruded part 521 protruded to one side in the width direction of the first portion 51 and the protruded part 522 protruded to the other side in the width direction of the first portion 51, and the holding part 25 is a recessed part formed on an inner face of the case 20. Therefore, only when the protruded parts 521 and 522 are disposed in the recessed parts, the flexible printed circuit board 50 can be held by the case 20. According to this structure, the flexible printed circuit board 50 can be held by the case 20 in a stable state and the flexible printed circuit board 50 is prevented from being projected from the case 20. Further, since the second portion 52 is only hooked to the holding part 25 of the case 20, the flexible printed circuit board 50 can be easily held by the case 20.
In this embodiment, after the second portion 52 of the flexible printed circuit board 50 is returned to the case 20 and held by the case 20, the soft adhesive 60 which is the second adhesive is injected into the case 20 and the inside of the case 20 is sealed. When the inside of the case 20 is sealed as described above, the flexible printed circuit board 50 can be protected and thus, disconnection and damage of the flexible printed circuit board 50 can be restrained.
In this embodiment, the hard adhesive 70 is removed which is projected to a side of the sensor face 11 through a gap space between the opening part 23 of the case 20 and the protection member 40. Therefore, a gap between a card 2 which slides on the sensor face 11 and the magneto-resistance effect element 30 can be determined by a thickness of the protection member 40. Accordingly, a gap between a card 2 and the magneto-resistance effect element 30 can be controlled finely and the gap between the magneto-resistance effect element 30 and the card 2 can be reduced. As a result, detection accuracy can be secured without using a yoke.
In the embodiment described above, the signal line 54 and the ground line 55 are provided in the flexible printed circuit board 50. However, the signal line 54 and the ground line 55 may be structured of another wiring member such as a lead wire.
In the embodiment described above, in order to fix the magneto-resistance effect element 30 to the case 20, the soft adhesive 60 is injected in the opening part 23 from an upper side of the magneto-resistance effect element 30 to form the first adhesive layer 61 and, in addition, in order to seal the flexible printed circuit board 50 in the case 20, the soft adhesive 60 is injected into the case 20 to form the second adhesive layer 62. However, the first adhesive layer 61 and the second adhesive layer 62 may be made of different types of adhesive or made of the same adhesive.
In the embodiment described above, the holding part 25 by which the second portion 52 of the flexible printed circuit board 50 is held in the case 20 is a recessed part formed on an inner face of the case 20. However, a hook-shaped protruded part may be provided on an inner face of the case 20 for holding the second portion 52 between the inner face of the case 20 and the hook-shaped protruded part instead of providing a simple recessed part. Alternatively, it may be structured that a wall thickness of the case 20 is increased so that a groove into which the second portion 52 can be inserted.
In the embodiment described above, a medium on which magnetic data are recorded is a card 2. However, a medium where magnetic data are recorded may be a medium other than a card.
In a case that a wiring member in a flexible shape is assembled in an inside of a case of a magnetic head together with a magneto-resistance effect element, the wiring member is not stable at the time of assembling and workability is deteriorated and thus the wiring member may be damaged. Further, when the magneto-resistance effect element is to be fixed, the magneto-resistance effect element is concealed by the wiring member and is not visually observed and thus, positional confirmation of the magneto-resistance effect element and pressing work of the magneto-resistance effect element are hard to be performed. Especially, in a case that the magneto-resistance effect element is positioned and assembled so that a gap between a card sliding on the sensor face and the magneto-resistance effect element is set to be several tens of μm, the magneto-resistance effect element is required to be positioned with respect to the sensor face of the case with a high degree of accuracy and assembled. However, when a wiring member in a flexible shape is used, it is difficult that the magneto-resistance effect element is positioned and assembled with a high degree of accuracy.
In view of the problem described above, an objective of at least an embodiment of the present invention is to improve workability when a wiring member in a flexible shape is assembled in an inside of a case of a magnetic head together with a magneto-resistance effect element.
In order to attain the above objective, at least an embodiment of the present invention provides a manufacturing method of a magnetic head structured to detect whether magnetic data are recorded on a medium or not. The manufacturing method includes positioning a protection member in an opening part of a case in which the opening part is formed in a sensor face facing a side where a medium is to be passed with the sensor face as a reference, applying a first adhesive to a face of the protection member on an opposite side to the sensor face, disposing a magneto-resistance effect element on the face where the first adhesive has been applied, extending a wiring member connected with the magneto-resistance effect element to an outer side of the case through a cut-out part formed in the case, hardening the first adhesive while pressing the magneto-resistance effect element from an opposite side to the sensor face, and injecting a second adhesive in an inside of the case so as to cover the magneto-resistance effect element and hardening the second adhesive.
In at least an embodiment of the present invention, when the magneto-resistance effect element disposed in the opening part of the case is to be fixed to the protection member by the first adhesive, the wiring member connected with the magneto-resistance effect element is extended to an outer side of the case through the cut-out part formed in the case. According to this structure, the wiring member in a flexible shape can be prevented from disturbing positional confirmation and pressing work of the magneto-resistance effect element. Further, when fixing work of the magneto-resistance effect element to the case is performed, disconnection, damage and the like of the wiring member can be restrained. In addition, the position of the magneto-resistance effect element in the inside of the case can be confirmed through the cut-out part. Further, after the magneto-resistance effect element has been fixed, the wiring member can be returned to the inside of the case through the cut-out part of the case and sealed. Therefore, workability can be improved when the magneto-resistance effect element is to be assembled in the inside of the case together with the wiring member in a flexible shape. Further, the magneto-resistance effect element can be positioned and fixed with a high degree of accuracy.
In at least an embodiment of the present invention, the wiring member is structured of a flexible printed circuit board. When a flexible printed circuit board is used as the wiring member, positioning and fixing work can be easily performed while using the wiring member in a flexible shape.
In at least an embodiment of the present invention, the flexible printed circuit board is provided with a first portion, which is thinner than a width of the cut-out part, and a second portion connected with the first portion and, in a state that the flexible printed circuit board is extended to an outer side of the case by passing the first portion through the cut-out part, a first adhesive is hardened and, after the first adhesive has been hardened, the first portion and the second portion are returned to the inside of the case, and the second portion is hooked to a holding part provided in the case and held. According to this structure, the flexible printed circuit board can be held by the case in a stable state and the flexible printed circuit board is prevented from projecting from the case. Further, the flexible printed circuit board can be easily held by the case by only hooking the second portion whose width is wider than the cut-out part to the holding part of the case.
For example, the second portion is provided with protruded parts which are protruded to both sides in a width direction of the first portion, and the holding part is a recessed part which is formed on an inner face of the case. According to this structure, the flexible printed circuit board can be held in the case only by disposing the protruded parts in the recessed part of the inner face of the case.
In at least an embodiment of the present invention, the case is formed of conductive resin, the flexible printed circuit board is provided with a branched part which is branched from the first portion, the branched part is provided with a ground line, the branched part is routed to a fixing part provided in the case, and the branched part is fixed to the fixing part with a conductive adhesive. According to this structure, the case can be grounded and thus the magneto-resistance effect element can be protected from static electricity. Further, since the ground line is provided in the branched part of the flexible printed circuit board, positioning and fixing work of the ground line can be performed easily.
In at least an embodiment of the present invention, the second portion is returned to the case and, after the second portion is held by the case, a second adhesive is injected into the inside of the case and the inside of the case is sealed. When the inside of the case is sealed, the flexible printed circuit board is protected and thus, disconnection and damage of the flexible printed circuit board can be restrained.
In at least an embodiment of the present invention, the first adhesive projected to a side of the sensor face through a gap space between the opening part and the protection member is removed. According to this structure, a gap between a medium sliding on the sensor face and the magneto-resistance effect element can be controlled by a thickness of the protection member. Therefore, a gap between the magneto-resistance effect element and a medium can be controlled finely and the gap between the magneto-resistance effect element and the medium can be reduced. Accordingly, detection accuracy can be secured without using a yoke for guiding magnetic flux to the magneto-resistance effect element.
Next, at least an embodiment of the present invention is a magnetic head for detecting whether magnetic data are recorded on a medium or not, and the magnetic head is manufactured in the above-mentioned manufacturing method of the magnetic head. In the card reader in which the above-mentioned magnetic head is used, workability at the time of assembling of the magnetic head which is mounted as a pre-head is satisfactory. Further, the magneto-resistance effect element can positioned and fixed with a high degree of accuracy in the inside of the case of the magnetic head.
In at least an embodiment of the present invention, when the magneto-resistance effect element is to be fixed to the protection member disposed in the opening part of the case with the first adhesive, the wiring member connected with the magneto-resistance effect element is extended to an outer side of the case through the cut-out part formed in the case. According to this structure, the wiring member in a flexible shape can be prevented from disturbing positional confirmation and pressing work of the magneto-resistance effect element. Further, when work is to be performed in which the magneto-resistance effect element is fixed to the case, disconnection or damage of the wiring member can be restrained. In addition, positional confirmation of the magneto-resistance effect element in an inside of the case can be performed through the cut-out part. Further, the wiring member can be returned to the inside of the case through the cut-out part of the case and sealed after the magneto-resistance effect element is fixed. Therefore, workability can be improved when the magneto-resistance effect element is to be assembled in the case together with the wiring member in a flexible shape. Further, the magneto-resistance effect element can be positioned and fixed with a high degree of accuracy.
While the description above refers to particular embodiments of the present invention, it will be understood that many modifications may be made without departing from the spirit thereof. The accompanying claims are intended to cover such modifications as would fall within the true scope and spirit of the present invention.
The presently disclosed embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Number | Date | Country | Kind |
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2018-052040 | Mar 2018 | JP | national |
2018-052041 | Mar 2018 | JP | national |