1. Field of the Invention
The invention relates to a leg unit equipped in a housing of an electric connector, and further, to a connector housing including the leg unit.
2. Description of the Related Art
An electric connector mounted on a printed circuit board is connected, for instance, directly to another printed circuit board, to another electric connector mounted on another printed circuit board, or to a cable. For fixing an electric connector onto a printed circuit board, a leg unit formed on a housing of the electric connector is inserted into a fixing hole formed through the printed circuit board, and the leg unit is engaged at a distal end thereof to a circumferential edge of the fixing hole.
As one of such electric connectors, Japanese Patent Application Publication No. 2002-319443 has suggested an electric connector 1000, which is illustrated in
The illustrated electric connector 1000 includes a housing 1001. The housing 1001 includes at opposite ends thereof a pair of contact surfaces 1002 making contact with an upper surface 1003 of a printed circuit board 1101, and a pair of engagement units 1003 in the form of a boss and formed of resin integrally with the housing 1001. The engagement unit 1003 is inserted into a fixing hole 1102 from the upper surface 1103 to a lower surface 1104, and is engaged to the lower surface 1104. The engagement unit 1003 is in the form of a boss, specifically, a substantially cylindrical projection, and is comprised of a pair of halves 1005 and 1006 formed by dividing a cylinder into two semicircular halves with a gap 1004. The half 1005 located nearer to an end of the electric connector 1000 than the half 1006 is designed at a distal end thereof with an outwardly directing hook 1007, through which the engagement unit 1003 is engaged to a circumferential edge of the fixing hole 1102.
The electric connector 1000 illustrated in
The looseness generated in the housing 1001 may cause to exert a load onto a connector terminal connected to the printed circuit board 1101.
In view of the above-mentioned problem in the conventional electric connector, it is an object of the present invention to provide a leg unit used for a connector housing, enabling a connector housing to follow a displacement of a printed circuit board in a thickness-wise direction of a printed circuit board and/or in a direction of a plane of a printed circuit board to thereby prevent generation of looseness between a printed circuit board and a connector housing, ensuring reduction in a load to be exerted onto a connector terminal.
In one aspect of the present invention, there is a leg unit used for a connector housing, the leg unit being inserted into a fixing hole formed through a printed circuit board from a first surface towards a second surface of the printed circuit board, the leg unit including a first projection having elasticity, a second projection, and a contact portion making contact with the first surface when the leg unit is inserted into the fixing hole, the first and second projections being spaced away from each other and facing each other, a distance between an outer surface of the first projection and an outer surface of the second projection being greater within a predetermined range than an inner diameter of the fixing hole, the first projection including a structure for preventing the leg unit from being released out of the fixing hole after the leg unit has been inserted into the fixing hole.
In the above-mentioned leg unit, the contact portion prevents forward movement of the first and second projections after the leg unit was inserted into a fixing hole of a printed circuit board and the first projection makes contact with an inner surface of a fixing hole by virtue of elastic reaction force to thereby prevent backward movement of the first and second projections, ensuring that a connector housing in which the leg unit is equipped is capable of following a displacement of a printed circuit board in a thickness-wise direction thereof (that is, a direction in which the leg unit is inserted into and released out of a fixing hole). Furthermore, the second projection makes contact at an outer surface thereof with an inner surface of a fixing hole to thereby position a connector housing relative to a printed circuit board, ensuring that a connector housing in which the leg unit is equipped is capable of following a displacement of a printed circuit board in a direction of a plane of the printed circuit board.
It is preferable that the predetermined range is defined as such a range that the first projection is kept inclined in the fixing hole, and the first projection makes contact with an edge of the fixing hole on a level with the first surface when the leg unit is inserted into the fixing hole.
For instance, the predetermined range is defined as a range of 0.5% to 20% of an inner diameter of the fixing hole.
It is preferable that the first projection includes a first shaft portion, a second shaft portion outwardly extending relative to the first shaft portion, and an inclined portion formed between the first and second shaft portions, the inclined portion making contact with an edge of the fixing hole on a level with the second surface when the leg unit is inserted into the fixing hole, the inclined portion defining the structure.
The inclined portion makes contact with an edge of the fixing hole on a level with the second surface when the leg unit is inserted into the fixing hole, and thus, the leg unit is prevented from being released out of the fixing hole. Thus, the first projection is elastically deformed in response to a displacement of a printed circuit board in a thickness-wise direction thereof, and the inclined portion is kept engaged to an edge of the fixing hole to thereby absorb the displacement. Accordingly, it is possible to prevent looseness of the first projection relative to the fixing hole.
It is preferable that the first projection includes a first shaft portion, and a second shaft portion outwardly extending relative to the first shaft portion, a wall extending perpendicularly to a length-wise direction of the first projection between the first and second shaft portions, the wall making contact with the second surface when the leg unit is inserted into the fixing hole, the wall defining the structure.
The wall makes contact with the second surface after the leg unit was inserted into the fixing hole, and thus, the leg unit is prevented from being released out of the fixing hole. Thus, the first projection is elastically deformed in response to a displacement of a printed circuit board in a thickness-wise direction thereof, and the wall is kept engaged to the second surface of a printed circuit board to thereby absorb the displacement. Accordingly, it is possible to prevent looseness of the first projection relative to the fixing hole.
It is preferable that the contact portion includes a surface making contact with the first surface when the leg unit is inserted into the fixing hole.
It is preferable that the contact portion has elasticity.
The contact portion makes contact with the first surface of a printed circuit board and pushes the same upwardly, the first shaft portion of the first projection makes contact with an edge of the fixing hole on a level with the first surface of a printed circuit board, and the inclined portion of the first projection is engaged to an edge of the fixing hole on a level with the second surface of a printed circuit board, ensuring that the first projection is firmly engaged to a printed circuit board, and accordingly, looseness of the first projection relative to the fixing hole can be prevented.
It is preferable that each of the first and second projections has a semicircular cross-section, the first and second projections being arranged such that arcuate portions thereof face in opposite directions.
It is preferable that the second projection has an arcuate cross-section having a circumference angle equal to or greater than 180 degrees.
It is preferable that the first projection is comprised of a plurality of projections having the same configuration as one another.
In another aspect of the present invention, there is provided a connector housing used for an electric connector, the housing including the above-mentioned leg unit by one or more.
The advantages obtained by the aforementioned present invention will be described hereinbelow.
In the leg unit in accordance with the present invention, the first projection is flexibly elastically deformed to thereby enable a connector housing to follow by virtue of elastic reaction force thereof a displacement of a printed circuit board not only in a thickness-wise direction of the same, but also in a direction of a plane of a printed circuit board. Accordingly, the leg unit makes it possible to prevent looseness of a connector housing relative to a printed circuit board, and further, to reduce a load to be exerted onto connector terminals supported by the connector housing.
The above and other objects and advantageous features of the present invention will be made apparent from the following description made with reference to the accompanying drawings, in which like reference characters designate the same or similar parts throughout the drawings.
A leg unit 50 in accordance with the first embodiment of the present invention is explained hereinbelow with reference to the drawings.
The electric connector 10 includes a plurality of connector terminals 20 electrically connected to the printed circuit boards P1 and P2, and a connector housing 30 supporting the connector terminals 20 in a line. Each of the connector terminals 20 is in the form substantially of a bar. The connector housing 30 includes the leg unit 50 in accordance with the first embodiment. Each of the connector terminals 20 illustrated in
The connector terminal 20 can be manufactured by bending a single elastic metal plate 210 illustrated in
Each of the first and second press-fit terminals 21a and 21b can be connected to the printed circuit boards P1 and P2 without being soldered. As illustrated in
The first and second projecting portions 22a and 22b prohibit the movement of the connector terminal 20 in a length-wise direction. As illustrated in
The first projecting portion 22a located closer to the printed circuit board P1 (see
Since the first and second projecting portions 22a and 22b are formed of an elastic thin metal plate, they can accomplish the same performance as that of the buffer portion 23.
As illustrated in
In the first embodiment, the three elastic pieces 231 are connected to the binders 232 and 233 such that the elastic pieces 231 are bound to be located close to one another. Hence, each of the three elastic pieces 231 makes uniform contact with each of three inner walls of the U-shaped binders 232 and 233.
For instance, in the case that the buffer portion 23 includes four or five elastic pieces 231, the binders 232 and 233 may be designed to have a rectangular or pentagonal cross-section, respectively. As an alternative, the binders 232 and 233 may be designed to be C-shaped or arcuate, even in which case, it is preferable that the elastic pieces 231 are bound such that they are located at the opposite ends 231a thereof close to the longitudinal center line of the connector terminal 20, and extend in parallel with the longitudinal center line of the connector terminal 20.
Hereinbelow is explained a process of manufacturing the connector terminal 20, with reference to
The connector terminal 20 is manufactured by bending a single elastic thin metal plate 210 illustrated in
First, each of the central shaft portions 211 located at the opposite ends of the metal plate 210 is bent about the longitudinal center lines L1 and L2 so as to have a U-shaped cross-section. Then, the U-shaped central shaft portion 211 is bent by 180 degrees towards the contact portion 213 about a line 241 horizontally extending between the central shaft portion 211 and the contact portion 213.
Then, the binders 214 and 215 extending in a direction perpendicular to the imaginary longitudinal center lines L1 and L2 and defining outer edges of the contact portion 213 are bent into C-shape, and the contact pieces 212 extending in parallel with the imaginary longitudinal center lines L1 and L2 are bent into a barrel shape such that the resultant contact portion 213 surrounds the central shaft portion 211.
After a folding line is formed into the opposite ends 231a with central areas of the elastic pieces 231 being kept straight, the binders 232 and 233 extending in a direction perpendicular to the imaginary longitudinal center lines L1 and L2 and defining outer edges of the buffer portion 23 are bent into U-shape to thereby bind therewith the elastic pieces 231 extending in parallel with the imaginary longitudinal center lines L1 and L2.
Thus, there is completed the connector terminal 20 illustrated in
As illustrated in
As illustrated in
The main body 40 includes a terminal housing 400 in which the connector terminals 20 are housed, a base 401, and a pair of reinforcement walls 402 formed at opposite ends of the base 401 in a length-wise direction. The terminal housing 400 is formed at a side of the base 401.
The terminal housing 400 includes a plurality of first holders 410, a plurality of second holders 420, and a plurality of guide walls 430. Each of the guide walls 430 is located between each of the first holders 410 and each of the second holders 420. The first holders 410 are equally spaced away from adjacent ones, arranged in a line, and are elastically deformable in accordance with a deflection of the connector terminal 20. Similarly, the second holders 420 are equally spaced away from adjacent ones, arranged in a line, and are elastically deformable in accordance with a deflection of the connector terminal 20. The number of the first holders 410 and the number of the second holders 420 are equal to the number of the connector terminals 20. The first holders 410 are located nearer to the printed circuit board P1 than the second holders 420, and the second holders 420 are located nearer to the printed circuit board P2 than the first holders 410. The buffer portion 23 in each of the connector terminals 20 is sandwiched between the adjacent guide walls 430.
As illustrated in
The wedges 442 inwardly project beyond the arms 441 towards each other. Between the arms 441 is formed a substantially rectangular space R in which the connector terminal 20 is housed. As illustrated in
As illustrated in
As is obvious in view of comparison of
As illustrated in
In contrast, as illustrated in
As illustrated in
The base 401 is rectangular in shape. The base 401 is formed at one side thereof with the connector housing 400 and at the other side thereof with grooves 401a at a predetermined pitch. The grooves 401a extend in parallel with a longitudinal axis of the connector terminal 20 housed in the terminal housing 400. The grooves 401a formed at a predetermined pitch on the base 401 provide enhanced flexibility to the base 401 in a length-wise direction. Furthermore, since partition walls between which the grooves 401a are formed act as ribs, rigidity of the base 401 is enhanced in a direction perpendicular to a length-wise direction of the base 401.
Each of the reinforcement walls 402 projects forwardly beyond the base 401 at the opposite ends of the base 401. The reinforcement walls 402 provide enhanced rigidity to the base 401 in a direction perpendicular to a length-wise direction of the base 401.
As illustrated in
The leg unit 50 includes a first projection 511 having elasticity, a second projection 51, and a contact portion 52 making contact with the first surface Pa when the leg unit 50 is inserted into the fixing hole Pb.
The first projection 511 includes a first shaft portion 510a having a semicircular cross-section, a second shaft portion 510b formed continuous with the first shaft portion 510a, having a semicircular cross-section, and having a radius greater than the same of the first shaft portion 510a, an inclined portion 510c formed between the first shaft portion 510a and the second shaft portion 510b, and a third shaft portion 510f formed continuous with the second shaft portion 510b, having a semicircular cross-section, and being tapered.
The second projection 512 includes a first shaft portion 510g having a semicircular cross-section, and a second shaft portion 510h formed continuous with the first shaft portion 510g, having a semicircular cross-section, and being tapered.
When the leg unit 50 is inserted into the fixing hole Pb, the first shaft portion 510g of the second projection 512 makes contact with an inner surface of the fixing hole Pb to thereby position the leg unit 50 relative to the printed circuit boards P1 and P2.
As later mentioned, when the leg unit 50 is inserted into the fixing hole Pb, the first shaft portions 510a and 510g make contact with an inner surface of the fixing hole Pb.
The first projection 511 and the second projection 512 are spaced away from each other with a gap 513 being formed therebetween, and are situated such that arcuate portions of them oppositely face each other. Specifically, the first and second projections 511 and 512 both having a semicircular cross-section are arranged such that their outer surfaces define a circumference of a circle.
The circle defined by the first and second projections 511 and 512 is designed to have a diameter D (see
Herein, the predetermined range is defined as such a range that the first projection 511 is kept inclined in the fixing hole Pb, and the first shaft portion 510a of the first projection 511 makes contact with an edge Pd of the fixing hole Pb on a level with the first surface Pa when the leg unit 50 is inserted into the fixing hole Pb.
For instance, the predetermined range is defined as a range of 0.5% to 20% of the inner diameter D2 of the fixing hole Pb.
The contact portion 52 is located adjacent to the second projection 512, and includes a contact surface 52a making contact with the first surface Pa of the printed circuit boards P1 and P2 when the leg unit 50 is inserted into the fixing hole Pb. The contact surface 52a extends perpendicularly to a length-wise direction of the second projection 512.
A distance L1 between the contact surface 52a of the contact portion 52 and a leading edge 510ca of the inclined portion 510c is set smaller than a thickness T of the printed circuit boards P1 and P2, and a distance L2 between the contact surface 52a of the contact portion 52 and a trailing edge 510cb of the inclined portion 510c is set greater than the thickness T of the printed circuit boards P1 and P2.
L1<T<L2
Accordingly, when the leg unit 50 is inserted into the fixing hole Pb, the inclined portion 510c makes contact with an edge Pc of the fixing hole Pb on a level with the second surface Pe of the printed circuit boards P1 and P2, as illustrated in
Since the inclined portion 510 is engaged to the edge Pc of the fixing hole Pb on a level with the second surface Pc, the leg unit 50 cannot be pulled out of the fixing hole Pb after the leg unit 50 has been inserted into the fixing hole Pb.
With respect to the electric connector 10 having the above-mentioned structure, a process of setting the connector terminals 20 into the connector housing 30 is explained hereinbelow.
When the connector terminals 20 are set into the connector housing 30, the connector terminals 20 are brought located in front of the connector housing 30. The buffer portion 23 of each of the connector terminals 20 is aligned with the guide walls 430.
Then, each of the connector terminals 20 is inserted into the first and second holders 410 and 420. When the connector terminal 20 is inserted into the space R through the wedges 442, the arms 441 are elastically deformed to thereby outwardly expand. Thus, even if a space between the wedges 442 is shorter than a width of the binders 232 and 233 of the buffer portion 23, the connector terminal 20 can be inserted into the first and second holders 410 and 420.
Since the arms 441 and the wedges 442 in the first and second holders 410 and 420 are made of elastic material, the wedges 442 can move away from each other without acting an excessive compressive force onto the connector terminal 20, ensuring that the connector terminal 20 can be readily inserted into the first and second holders 410 and 420. Furthermore, when the arms 441 are elastically deformed to return to their initial positions, a space between the wedges 442 is shortened, and hence, the connector terminal 20 is held between the arms 441.
Then, a process of inserting the connector terminals 20 into the printed circuit boards P1 and P2 is explained hereinbelow.
First, as illustrated in
As illustrated in
As illustrated in
As illustrated in
The inclined portion 510c of the first projection 511 makes contact with the edge Pc of the fixing hole Pb on a level with the second surface Pe to thereby prevent the first and second projections 511 and 512 to be released out of the fixing hole Pb. Thus, the first shaft portion 510a of the first projection 511 is elastically deformed in response to a displacement of the first and second projections 511 and 512 relative to the printed circuit board P2 in a thickness-wise direction thereof, and the inclined portion 510c is kept engaged to the edge Pc of the fixing hole Pb to thereby absorb the displacement. Accordingly, it is possible to prevent looseness of the first projection 511 relative to the fixing hole Pb.
Thus, the first and second projections 511 and 512 enable the connector housing 30 to follow a displacement of the printed circuit board P2 in a thickness-wise direction.
By inserting the first and second projections 511 and 512 into the fixing hole Pb, it is possible to cause the connector housing 30 to follow a displacement of the printed circuit board P2 both in a thickness-wise direction and in a direction of a plane of the printed circuit board P2. Thus, it is possible to prevent looseness of the connector housing 30 relative to the printed circuit board P2, ensuring reduction in a load to be exerted on the connector terminals 20.
As illustrated in
Even if a stress acts on the connector terminal 20 in a direction of the longitudinal center line L2 thereof when the second press-fit terminal 21b is inserted into the through-holes TH, the second projection portion 22b is engaged with the arms 441 and the wedges 442 of the second holder 420, and hence, the connector terminal 20 can be avoided from moving towards the longitudinal center line L2. Thus, since the connector terminal 20 does not move in a direction of the longitudinal center line L2, the second press-fit terminal 21b can be smoothly inserted into the through-holes TH of the printed circuit board P2.
Then, after the printed circuit board P1 was positioned above the electric connector 10, the first and second projections 511 and 512 are inserted into the fixing holes Pb of the printed circuit board P1, and the first press-fit terminals 21a are inserted into the through-hole TH formed in a line through the printed circuit board P1.
The first and second projections 511 and 512 are inserted into the fixing hole Pb of the printed circuit board P1, similarly to the insertion of the first and second projections 511 and 512 into the printed circuit board P2. As illustrated in
Even if a positional relation between the printed circuit boards P1 and P2 were deflected when the first press-fit terminals 21a are inserted into the through-holes TH, since the first holder 410 holds the connector terminal 20 in a non-fixed condition, as illustrated in
For instance, if the electric connector 10 oscillates while being connected to the printed circuit boards P1 and P2, a positional relation between the printed circuit boards P1 and P2 is deflected. Since the connector terminal 20 is designed to include the buffer portion 23, even if a positional relation between the first and second press-fit terminals 21a and 21b were deflected, the buffer portion 23 would be elastically deformed to absorb the deflection in the positional relation.
Furthermore, since the arms 441 and the wedges 442 in the first and second holders 410 and 420 are made of elastic material, even if a positional relation between the printed circuit boards P1 and P2 were much deflected, the arm 441 on which a load is exerted by the connector terminal 20 is outwardly deformed to thereby allow the connector terminal 20 to be deflected.
Thus, even when a positional relation between the printed circuit boards P1 and P2 were deflected due to oscillation with the first and second press-fit terminals 21a and 21b being inserted into the through-holes TH of the printed circuit boards P1 and P2 and further with the connector housing 30 being fixed to the printed circuit boards P1 and P2, it is possible to reduce a load exerted by the connector housing 30 onto the connector terminals 20.
The leg unit in accordance with the second embodiment is explained hereinbelow with reference to
In comparison with the leg unit 50 in accordance with the first embodiment, the leg unit 50x in accordance with the second embodiment is designed to include a first projection 511x having a semi-annular wall 510e in place of the first projection 511 having the inclined portion 510c. The wall 510e extends between the first shaft portion 510a and the second shaft portion 510b perpendicularly to a length-wise direction of the first projection 511x.
The leg unit 50x in accordance with the second embodiment is designed to have the same structure as that of the leg unit 50 in accordance with the first embodiment except including the wall 510e in place of the inclined portion 510c.
After the leg unit 50x was inserted into the fixing hole Pb, the wall 510e is engaged to the second surface Pe of the printed circuit boards P1 and P2 to thereby prevent the leg unit 50x from moving in the direction S2, ensuring that the leg unit 50x is not released out of the fixing hole Pb.
The leg unit 50x in accordance with the second embodiment provides the same function as that of the leg unit 50 in accordance with the first embodiment. Furthermore, the wall 510e is engaged to the second surface Pe of the printed circuit boards P1 and P2 in a greater area than the inclined portion 510c. Accordingly, the leg unit 50x in accordance with the second embodiment can more surely prohibit the leg unit 50 to move in the direction S2, and hence, avoid the leg unit 50x to be released out of the fixing hole Pb than the leg unit 50 in accordance with the first embodiment.
The leg unit in accordance with the third embodiment is explained hereinbelow with reference to
In comparison with the leg unit 50x in accordance with the second embodiment, the leg unit 50y in accordance with the third embodiment is designed to include a pair of contact portions 52y in place of the contact portion 52.
The leg unit 50y in accordance with the third embodiment is designed to have the same structure as that of the leg unit 50x in accordance with the second embodiment except including the contact portions 52y in place of the contact portion 52.
The contact portions 52 are made of an elastic material.
The contact portions 52 extend from proximal ends of the first and second projections 511y and 512 in opposite directions radially of the first and second projections 511y and 512.
Each of the contact portions 52 is J- or U-shaped, and makes contact at a summit thereof with the first surface Pa of the printed circuit boards P1 and P2.
In other words, each of the contact portions 52y is in the form of a spring plate, making contact with the first surface Pa at a location away from a center of the leg unit 50y.
The leg unit 50y in accordance with the third embodiment provides the same function as that of the leg unit 50x in accordance with the second embodiment. Furthermore, since the contact portions 52y compress the printed circuit boards P1 and P2 through the first surface Pa by virtue of elastic reaction force to thereby push the printed circuit boards P1 and P2 to the wall 510e, the printed circuit boards P1 and P2 are surely sandwiched between the contact portions 52y and the wall 510e. Thus, the contact portions 52y enable the connector housing 30 to follow a displacement of the printed circuit boards P1 and P2 in a thickness-wise direction.
Though the leg unit 50y is designed to include a pair of the contact portions 52y, the leg unit 50y may be designed to include one of the contact portions 52y, in which case, the contact portion 52y is designed to provide more intensive elastic reaction force than the same provided by each of the contact portions 52y. As an alternative, the leg unit 50y may be designed to include three or four contact portions 52y arranged at every 120 or 90 circumference angles around a center of the leg unit 50y, respectively. The leg unit 50y may be designed to include the contact portion 52 (see the first and second embodiments) in place of one of the contact portions 52y.
The leg unit in accordance with a variation of the first embodiment is explained hereinbelow with reference to
The second projection 512 is necessary to have 180 degrees or more as a circumferential angle.
Designing the second projection 512 to have 180 degrees or more as a circumferential angle, since the first shaft portion 510g of the second projection 512 makes contact at an outer surface thereof with an inner surface of the fixing hole Pb, the second projection 512 is prohibited to move in directions F1 and F2, specifically, directions in which the gap 513 extends around a center O1 of the leg unit 50. Furthermore, since the first shaft portion 510g of the second projection 512 makes contact at an outer surface thereof with an inner surface of the fixing hole Pb, the second projection 512 is prohibited to move in a direction F3, specifically, a direction opposite to the first projection 511 about the center O1 of the leg unit 50. In addition, since the first shaft portion 510a of the first projection 511 makes contact at an outer surface thereof with an inner surface of the fixing hole Pb, the first projection 511 is prohibited to move in a direction F4, specifically, a direction towards the first projection 511 from the center O1 of the leg unit 50.
Thus, it is possible to prevent the second projection 512 from moving in a direction of a plane of the printed circuit boards P1 and P2, by designing the second projection 512 to have 180 degrees as a circumferential degree, ensuring that the connector housing 30 can be accurately positioned relative to the printed circuit boards P1 and P2.
If the second projection 512 is designed to have 180 degrees as a circumferential degree, the first projection 511 may be designed to have a circumferential degree smaller than 180 degrees, or the first projection 511 may be designed to be comprised of a plurality of projections 511z, as illustrated in
The leg unit in accordance with the present invention is suitable to a connector housing of an electric connector used broadly in various fields such as an electric/electronic industry and an automobile industry, as an electric connector to be used for electric/electronic devices or to be equipped in an automobile.
While the present invention has been described in connection with certain preferred embodiments, it is to be understood that the subject matter encompassed by way of the present invention is not to be limited to those specific embodiments. On the contrary, it is intended for the subject matter of the invention to include all alternatives, modifications and equivalents as can be included within the spirit and scope of the following claims.
The entire disclosure of Japanese Patent Application No. 2013-225790 filed on Oct. 30, 2013 including specification, claims, drawings and summary is incorporated herein by reference in its entirety.
Number | Date | Country | Kind |
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2013-225790 | Oct 2013 | JP | national |