JP2013142655A - Antenna unit for radio watch and radio watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna unit for a radio watch in which an antenna core and a sub magnetic path member can be closely attached surely and easily.SOLUTION: An antenna unit 2 includes an antenna core 20, a sub magnetic path member 30, a coil wound around the antenna core 20, and antenna frames 40, 50. The antenna core 20 includes a coil winding part 21 around which the coil is wound, a first lead part 22 and a second lead part 23. The sub magnetic path member 30 includes a first end part 31 and a second end part 32. The antenna frames 40, 50 respectively include a first holding part 41 for holding the first end part 31 of the sub magnetic path member 30 to a side face 223 of the first lead part 22 of the antenna core 20 in a closely-attached state and a second holding part 51 for holding the second end part 32 of the sub magnetic path member 30 to a side face 233 of the second lead part 23 of the antenna core 20 in a closely-attached state.

Description

  The present invention relates to a radio-controlled timepiece antenna unit that receives a standard radio wave having time information and a radio-controlled timepiece that incorporates the radio-controlled timepiece antenna unit.

  As an antenna for a radio timepiece, an antenna having a main magnetic path and a sub magnetic path is known in order to reduce eddy current loss and improve reception sensitivity (see Patent Document 1).

As shown in FIG. 1 of Patent Document 1, the antenna of Patent Document 1 is configured by winding a coil around a magnetic core to form a main magnetic path, and connecting a sub magnetic path member to the main magnetic path.
Further, as shown in FIG. 9 of Patent Document 1, when the antenna is arranged in the case of the watch, the sub magnetic path member is arranged on the case side, and the main magnetic path is located on the center side of the case, that is, on the center side of the movement. Is arranged.

JP 2006-67544 A

Patent Document 1 describes that a sub magnetic path member is connected to a magnetic core constituting a main magnetic path without an air gap, but a specific structure for realizing the configuration is not disclosed.
Here, since the wristwatch antenna is arranged in a small and metal watch case, when a secondary magnetic path member is provided to improve reception sensitivity, the secondary magnetic path member and the magnetic core (antenna core) Distance is important. For this reason, there has been a demand for an antenna unit that can reliably and easily adhere the antenna core and the sub magnetic path member in order to improve sensitivity.

  An object of the present invention is to provide a radio timepiece antenna unit capable of reliably and easily bringing an antenna core and a sub magnetic path member into close contact, and a radio timepiece incorporating the radio timepiece antenna unit.

  An antenna unit for a radio timepiece of the present invention includes an antenna core, a sub magnetic path member, a coil wound around the antenna core, and an antenna frame, and the antenna core is a coil winding portion around which the coil is wound. A first lead portion formed continuously at the first end portion of the coil winding portion, and a second lead portion formed continuously at the second end portion of the coil winding portion, The sub magnetic path member includes a first end that is an end on the first lead portion side, and a second end that is an end on the second lead portion side, and the antenna frame includes: A first holding portion for holding the antenna core and the sub magnetic path member in a state where the first end of the sub magnetic path member is in close contact with a side surface of the first lead portion of the antenna core; In a state where the second end portion of the sub magnetic path member is in close contact with the side surface of the second lead portion Serial characterized in that it comprises a second holding portion for holding the antenna core and the secondary magnetic path member.

According to the present invention, since the first holding portion and the second holding portion are formed on the antenna frame, the antenna core and the sub magnetic path member can be positioned and attached to the antenna frame.
For example, with the antenna core in contact with the first holding part or the second holding part of the antenna frame, the antenna core is bonded to the antenna frame, and the sub magnetic path member is applied to the first holding part or the second holding part. Adhere to the antenna frame in contact. Thus, the first end and the second end, which are both ends of the sub magnetic path member, are configured to reliably and easily adhere to the first lead portion and the second lead portion of the antenna core. it can.
And the magnetic flux which generate | occur | produces in a coil because the magnetic flux by an electromagnetic wave (electromagnetic wave) flows through the antenna core used as a main magnetic path can let the said sub magnetic path member pass. Therefore, the magnetic flux generated in the coil can be suppressed from passing through metal parts provided around the antenna unit such as a metal gear or case, and the eddy current loss can be reduced and the receiving sensitivity can be improved.
Furthermore, since the sub magnetic path member is provided, it is possible to suppress a decrease in reception characteristics even if the size of the antenna core is reduced. Therefore, it can be used as an antenna unit for a small radio timepiece such as a wristwatch.

  In the radio timepiece antenna unit according to the present invention, the coil winding portion is formed in a straight bar shape, the sub magnetic path member is formed in a straight bar shape, and is disposed in parallel to the coil winding portion. The holding portion includes a first intermediate protrusion, a first core side protrusion, and a first sub magnetic path side protrusion protruding from the holding surface of the antenna frame, and the second holding portion protrudes from the holding surface of the antenna frame. Provided with a second intermediate protrusion, a second core side protrusion, and a second sub magnetic path side protrusion, and a holding groove formed between the first intermediate protrusion and the first core side protrusion is provided with the coil winding portion. The first end is held, and the second end of the coil winding portion is held in a holding groove formed between the second intermediate protrusion and the second core-side protrusion, and the first intermediate protrusion The first end side of the sub magnetic path member is held in the holding groove formed between the first sub magnetic path side protrusion and the first sub magnetic path side protrusion. Is, the holding grooves formed between said second intermediate projection and the second sub-path-side projection, it is preferable that the second end side of the sub-magnetic path member is held.

In the present invention, for example, the coil winding portion of the antenna core is disposed in the holding groove between the first intermediate protrusion and the first core side protrusion and the holding groove between the second intermediate protrusion and the second core side protrusion, and the first The coil winding part is brought into contact with the intermediate protrusion and the second intermediate protrusion and bonded to the antenna frame.
Then, the coil is wound around a coil winding portion between the first intermediate protrusion, the first core side protrusion, the second intermediate protrusion, and the second core side protrusion.
Thereafter, the sub magnetic path member is disposed in the holding groove between the first intermediate protrusion and the first sub magnetic path side protrusion and the holding groove between the second intermediate protrusion and the second sub magnetic path side protrusion, and the first intermediate protrusion The sub magnetic path member is brought close to the second intermediate projection side and bonded to the antenna frame. For this reason, the 1st end part and 2nd end part of a submagnetic path member can be stuck to the 1st lead part and 2nd lead part of an antenna core.
That is, by arranging the antenna core and the sub magnetic path member in each holding groove and approaching each other, that is, by arranging the antenna core and the sub magnetic path member between the first intermediate protrusion and the second intermediate protrusion side, Each lead part of the antenna core and the sub magnetic path member can be brought into close contact easily and reliably.

  In the radio timepiece antenna unit according to the present invention, the antenna frame is composed of two members, a first antenna frame having the first holding portion and a second antenna frame having the second holding portion. Is preferred.

  If the antenna frame is composed of the first and second antenna frames, it is not necessary to stack the connection portion of the antenna frame on the coil winding part, compared with the case where the coil is wound around the coil winding part and the antenna frame. If the number of turns is the same, the diameter of the coil can be reduced. For this reason, the antenna unit can be thinned.

  In the radio timepiece antenna unit of the present invention, the first antenna frame protrudes from the holding surface and is on an extension line of a holding groove formed between the first intermediate protrusion and the first core side protrusion. A first locking projection formed, wherein the second antenna frame protrudes from the holding surface and is on an extension line of a holding groove formed between the second intermediate projection and the second core-side projection. The first lead portion is positioned with respect to the first antenna frame by the first intermediate projection, the first core side projection, and the first locking projection, The two-lead portion is preferably positioned with respect to the second antenna frame by the second intermediate protrusion, the second core-side protrusion, and the second locking protrusion.

  According to the present invention, the first antenna frame and the second antenna frame can be positioned and fixed to each lead portion of the antenna core. For this reason, each antenna frame can be easily aligned with respect to the antenna core.

  In the radio timepiece antenna unit according to the present invention, the antenna frame includes a first positioning portion that positions a first magnetic flux collecting plate that is in close contact with the surface of the first lead portion, and a first contact portion that is in close contact with the surface of the second lead portion. It is preferable to include a second positioning portion that positions the two magnetic flux collecting plates.

According to the present invention, if the first and second magnetic flux collecting plates that are in close contact with the first and second lead plates are provided, the magnetic flux of radio waves is collected in an area larger than the surface area of each lead portion. Therefore, the magnetism collecting effect can be improved. In particular, since each magnetic flux collecting plate is in close contact with each lead portion, the magnetic coupling between the magnetic flux collecting plate and the lead portion can be enhanced, and the magnetic flux collecting effect can be further improved.
Further, since the magnetic flux collecting plate can be formed in a thin plate shape having a thickness dimension smaller than that of the antenna core, it is possible to increase the degree of freedom of the layout layout of the antenna unit in the timepiece.
Furthermore, since the positioning part which positions each magnetic flux collecting plate is provided in the antenna frame, the magnetic flux collecting plate can be easily arranged at a predetermined position. For this reason, it is possible to easily prevent the magnetic flux collecting plate from protruding from the antenna frame, and it is possible to prevent the magnetic flux collecting plate from being damaged.

  In the radio timepiece antenna unit of the present invention, it is preferable that a hook portion that is detachably attached to a base plate of the radio timepiece is formed on the antenna frame.

According to the present invention, since the hook portion is provided, the fixing work can be facilitated and the plane area of the antenna unit can be reduced, compared with the case where the screw portion is used instead of the hook portion, and the antenna unit can be reduced. It can also be incorporated into a small watch such as a wristwatch.
That is, in order to position and fix the antenna unit to the ground plane, it is necessary to fix it to the ground plane at at least three locations of the antenna frame. For this reason, when fixing an antenna frame to a ground plane with a screw, the screwing operation | work of three places is needed. In addition, since the antenna frame is usually attached to the ground plate by screwing it from the back cover side, the antenna frame should be placed in a position that does not overlap with the antenna core, the secondary magnetic path member, the magnetic flux collecting plate, etc. It is necessary to form a screw hole. For this reason, it is necessary to form an overhang for forming a screw hole in the antenna frame, and the flat area of the antenna frame (the area in the plane parallel to the dial and the main plate of the watch) increases, which makes it possible to make a small wristwatch. It is difficult to incorporate.
On the other hand, since the hook portion as in the present invention can be formed from the antenna frame along the clock thickness direction, for example, the plane area of the antenna frame can be reduced as compared with the case where it is fixed only by screws. . In addition, it is preferable that a hook part is provided in two places of at least three places which fix an antenna frame to a ground plane, and the other one place is screwed.

The radio timepiece of the present invention includes the radio timepiece antenna unit.
According to the present invention, since the sub magnetic path member is provided, it is possible to suppress a decrease in reception characteristics even if the antenna core is downsized. For this reason, the radio timepiece incorporating the antenna unit can be reduced in size.

It is a front view showing a radio timepiece of an embodiment of the present invention. It is a schematic perspective view which shows the baseplate and antenna unit of the said radio timepiece. It is a disassembled perspective view which shows the said ground plate and an antenna unit. It is a perspective view which shows the said antenna unit. It is a disassembled perspective view which shows the said antenna unit. It is a side view which shows the principal part of the said antenna unit.

Embodiments according to the present invention will be described below with reference to the drawings.
[Configuration of radio clock]
FIG. 1 is a plan view of a radio timepiece (radio wave correction timepiece) 1 according to the present embodiment.
As shown in FIG. 1, a radio timepiece 1 that is an electronic timepiece with a built-in antenna is a pointer-type wristwatch (analog timepiece) having a time display unit 10 for displaying time. The time display unit 10 includes an hour hand 11, a minute hand 12, a second hand 13, and a dial plate 14. The radio timepiece 1 is a timepiece that receives a long wave standard radio wave as a radio wave including time information, and can correct the indicated positions of the hour hand 11, the minute hand 12, and the second hand 13 based on the received time information.

Here, the dial plate 14 is preferably formed of a non-conductive material such as synthetic resin or ceramic, so that the long wave standard wave entering from the cover glass 120 side is not hindered, and an antenna described later. The unit 2 can receive well.
The configuration of the receiving circuit that receives the long wave standard radio wave by the antenna unit 2 is the same as that of a conventional radio timepiece, and thus the description thereof is omitted.

[Radio watch structure]
Next, a specific structure of the radio timepiece 1 will be described.
The radio timepiece 1 includes an exterior case 100. The outer case 100 includes a casing (body) 110 formed in an approximately ring shape, a cover glass 120 attached to the front side of the casing 110, and a back cover (not shown) detachably attached to the back side of the casing 110. And.

The casing 110 is made of a metal material such as stainless steel, brass, or titanium. The casing 110 is formed in a substantially cylindrical shape, and the inner peripheral surface is formed in a substantially circular plane.
The back cover is made of a metal material similar to that of the casing 110, and is fixed to the back surface opening of the casing 110.

In the outer case 100, a movement (module) 3 as shown in FIG. The movement 3 includes a base plate 5 made of synthetic resin. Although not shown, a circuit board, a motor, a train wheel, a secondary battery, and the like are attached to the ground plate 5, which are not described here because they have the same configuration as a conventional radio timepiece.
Further, as shown in FIG. 3, the antenna unit 2 is detachably attached to the ground plane 5.

[Antenna unit structure]
As shown in FIGS. 3 to 5, the antenna unit 2 includes an antenna core (magnetic core) 20, a sub magnetic path member 30, a first antenna frame 40, a second antenna frame 50, and a first magnetic flux collecting plate. 60 and a second magnetism collecting plate 70.
The antenna core 20 is wound with a coil (not shown), and is insulated as necessary by cationic electrodeposition coating having excellent corrosion resistance.

For example, the antenna core 20 is formed by punching out a cobalt-based amorphous metal foil (eg, amorphous sheet of Co 50 wt% or more) as a magnetic foil material with a mold or by etching in the thickness direction of the radio timepiece 1. About 30 sheets are bonded and superposed, and heat treatment such as annealing is performed to stabilize the magnetic properties.
As illustrated in FIG. 5, the antenna core 20 includes a coil winding portion 21, a first lead portion 22, and a second lead portion 23.

The coil winding portion 21 is a rod-like portion that is extended in a straight (linear) shape and wound with a coil (not shown). That is, the coil winding part 21 is formed in a bar shape having a constant width dimension.
The first lead portion 22 is formed continuously with the first end portion 211 that is one end portion of the coil winding portion 21 in the longitudinal direction.
The second lead portion 23 is formed continuously with the second end portion 212 which is the other end portion in the longitudinal direction of the coil winding portion 21.

The first lead portion 22 has a substantially triangular shape when viewed from the surface of the radio timepiece 1 (the dial side of the movement 3).
That is, the first lead portion 22 includes a first side surface 221 that extends from the first end portion 211 of the coil winding portion 21 to the outer periphery side of the movement 3, and a first end portion 211 that extends from the first end portion 211 to the inner periphery side of the movement 3. A second side surface 222 that extends, a third side surface 223 that extends from the second side surface 222 along the longitudinal direction of the coil winding portion 21 to the distal end side of the first lead portion 22, and the first side surface 221 and the third side surface And a fourth side surface 224 connecting the end edges of the side surface 223.
The fourth side surface 224 has an arc shape substantially along the outer peripheral surface of the main plate 5, and a positioning recess 226 is formed at a position on the extension line in the longitudinal direction of the coil winding portion 21.

The second lead portion 23 has a substantially arc shape when viewed from the surface of the radio timepiece 1 (the dial side of the movement 3).
That is, the second lead portion 23 is formed on the first side surface 231 that extends from the second end portion 212 of the coil winding portion 21 to the outer peripheral side of the movement 3, and from the second end portion 212 to the inner peripheral side of the movement 3. A second side surface 232 that is extended, a third side surface 233 that extends from the second side surface 232 to the distal end side of the second lead portion 23 along the longitudinal direction of the coil winding portion 21, and an arc surface from the third side surface 233 And a fifth side surface 235 that connects between the edges of the fourth side surface 234 and the first side surface 231.
The fifth side surface 235 has an arc shape substantially along the outer peripheral surface of the main plate 5, and a positioning recess 236 is formed at a position on the extension line in the longitudinal direction of the coil winding portion 21.

Here, since each amorphous foil of the antenna core 20 has a thickness dimension of about 0.01 mm to 0.05 mm, for example, when 30 sheets are laminated, the thickness dimension of the antenna core 20 in the lamination direction is 0.3 to 0.3 mm. It is about 1.5 mm. Since the amorphous foil material has better magnetic properties than ferrite, a smaller and thinner antenna can be realized.
The antenna core 20 is not limited to the laminated amorphous foil, and may be a soft magnetic metal ribbon or the like. The antenna core 20 may be made of ferrite that is inferior in performance but inexpensive. In this case, the antenna core 20 may be formed by a mold and heat-treated.

  The coil wound around the coil winding portion 21 of the antenna core 20 requires an inductance value of about 15 to 50 mH when receiving a long wave standard radio wave (40 to 77.5 kHz). For this reason, in this embodiment, a uremet wire having a diameter of about 50 μm is wound as a coil by winding it for several hundred turns.

Similar to the antenna core 20, the sub magnetic path member 30 may be formed by laminating an amorphous alloy, a soft magnetic metal ribbon, or the like, or may be composed of soft magnetic ferrite. Further, the secondary magnetic path member 30 has a relative permeability equal to or lower than that of the antenna core 20.
The sub magnetic path member 30 is formed in a bar shape having a rectangular cross section, and the thickness dimension (the dimension in the watch thickness direction) is set to be approximately the same as the thickness of the antenna core 20 as shown in FIG. Yes.
As will be described later, the sub magnetic path member 30 is held in parallel with the coil winding portion 21 by being held by the first antenna frame 40 and the second antenna frame 50. Further, the side surfaces of the first end portion 31 and the second end portion 32 that are both ends in the longitudinal direction of the sub magnetic path member 30 are respectively connected to the third side surface 223 of the first lead portion 22 of the antenna core 20 and the second end portion 32. The two lead portions 23 are in close contact with the third side surface 233.

The first antenna frame 40 is a synthetic resin member, and includes a first holding portion 41 that holds the antenna core 20 and the sub magnetic path member 30 in a close contact state.
The first holding portion 41 includes a first intermediate protrusion 42 and a first core-side protrusion that protrude from the holding surface 400 on which the antenna core 20 and the sub magnetic path member 30 are placed (held) in the first antenna frame 40. 43, a first auxiliary magnetic path side protrusion 44 is provided. Further, a first locking projection 45 is also provided on the holding surface 400.
A positioning hole 441 is formed in the first sub magnetic path side protrusion 44.

  The first antenna frame 40 is formed with a hook portion 46, a protruding portion 47, a wall portion 48 protruding from the protruding portion 47, and an insertion hole 49 through which an unillustrated screw fixed to the ground plate 5 is inserted. ing. Further, a mounting table 471 for mounting the first magnetic flux collecting plate 60 is formed on the upper surface of the protruding portion 47.

Similar to the first antenna frame 40, the second antenna frame 50 is a member made of synthetic resin, and includes a second holding portion 51 that holds the antenna core 20 and the sub magnetic path member 30 in close contact with each other.
The second holding portion 51 includes a second intermediate protrusion 52 and a second core-side protrusion that protrude from the holding surface 500 on which the antenna core 20 and the sub magnetic path member 30 are placed (held) in the second antenna frame 50. 53, a second auxiliary magnetic path side protrusion 54 is provided.
Further, a second locking projection 55 is also provided on the holding surface 500.

  The second antenna frame 50 is formed with a hook portion 56, a protruding portion 57, and a wall portion 58. A protruding pin 571 is formed on the upper surface of the protruding portion 57.

[Fixing of antenna frame, antenna core, and sub magnetic path member]
The antenna core 20 and the sub magnetic path member 30 are held by the first holding part 41 and the second holding part 51 of the first antenna frame 40 and the second antenna frame 50.
That is, the first end 211 of the coil winding portion 21 of the antenna core 20 is disposed in the groove between the first intermediate protrusion 42 and the first core-side protrusion 43. Further, the first side surface 221, the second side surface 222, and the concave portion 226 of the first lead portion 22 abut on the first core side protrusion 43, the first intermediate protrusion 42, and the first locking protrusion 45 of the first antenna frame 40. Thus, the first lead portion 22 is positioned on the first antenna frame 40.
Similarly, the second end 212 of the coil winding portion 21 of the antenna core 20 is disposed in the groove between the second intermediate protrusion 52 and the second core-side protrusion 53. Further, the first side surface 231, the second side surface 232, and the concave portion 236 of the second lead portion 23 abut on the second core side protrusion 53, the second intermediate protrusion 52, and the second locking protrusion 55 of the second antenna frame 50. Thus, the second lead portion 23 is positioned on the second antenna frame 50.

The sub magnetic path member 30 includes a groove between the first intermediate protrusion 42 and the first sub magnetic path side protrusion 44 of the first holding part 41, and a second intermediate protrusion 52 and a second sub magnetic path side protrusion 54 of the second holding part 51. It is arranged in the groove between. At this time, the auxiliary magnetic path member 30 has the end portions 31 and 32 outside the first holding portion 41 and the second holding portion 51 of the auxiliary magnetic path member 30, the third side surface 223 of the antenna core 20, and the second holding portion 51. The three side surfaces 233 are held in close contact with each other.
That is, the width dimensions of the first intermediate protrusion 42 and the second intermediate protrusion 52 are substantially the same as the protrusion dimensions of the second side surface 222 and the second side surface 232. The antenna core 20 is adhered to the first antenna frame 40 and the second antenna frame 50 in a state where the antenna core 20 is in contact with the first intermediate protrusion 42 and the second intermediate protrusion 52, so The side surface of the second intermediate protrusion 52 on the sub magnetic path member 30 side is set to be substantially flush with the third side surface 223 and the third side surface 233. For this reason, if the sub magnetic path member 30 is arranged to be pressed against the first intermediate protrusion 42 and the second intermediate protrusion 52 and bonded to the first antenna frame 40 and the second antenna frame 50, each of the sub magnetic path members 30 is provided. The end portions 31 and 32 are in close contact with the lead portions 22 and 23.

  The sub magnetic path member 30 is disposed between the protrusion 47 of the first antenna frame 40 and the protrusion 57 of the second antenna frame 50, and the position of the sub magnetic path member 30 in the longitudinal direction is restricted. For example, the sub magnetic path member 30 determines the position in the longitudinal direction by bringing one end face into contact with the protruding portion 57.

A first magnetic flux collecting plate 60 is bonded to the surface of the first lead portion 22. The first magnetic flux collecting plate 60 is formed in the same surface shape as the first lead portion 22 and includes a portion extended from the first lead portion 22 to the mounting table 471. For this reason, the first magnetic flux collecting plate 60 is formed in an area larger than the surface of the first lead portion 22 (the bonding surface of the first magnetic flux collecting plate 60).
An extended portion of the first magnetic flux collecting plate 60 is placed on the placement table 471.
The peripheral surface of the first magnetic flux collecting plate 60 is in contact with the wall portion 48, the hook portion 46, the first locking protrusion 45, the first core side protrusion 43, the first intermediate protrusion 42, and the first sub magnetic path side protrusion 44. Positioned in contact. Accordingly, the first antenna frame 40 has the first collection by the wall portion 48, the hook portion 46, the first locking projection 45, the first core side projection 43, the first intermediate projection 42, and the first sub magnetic path side projection 44. A first positioning portion for positioning the magnetic plate 60 is configured.

  A second magnetism collecting plate 70 is bonded to the surface of the second lead portion 23. The second magnetic flux collecting plate 70 is formed in the same surface shape as the second lead portion 23. Therefore, the periphery of the second magnetic flux collecting plate 70 is positioned in contact with the protrusion 57, the wall 58, the hook 56, the second core side protrusion 53, the second intermediate protrusion 52, and the second auxiliary magnetic path side protrusion 54. Has been. Accordingly, the second magnetic flux collecting plate 70 is positioned in the second antenna frame 50 by the protrusion 57, the wall 58, the hook 56, the second core side protrusion 53, the second intermediate protrusion 52, and the second auxiliary magnetic path side protrusion 54. A second positioning part is configured.

Here, the first magnetic flux collecting plate 60 and the second magnetic flux collecting plate 70 are configured by laminating several (for example, three) magnetic foil bodies (amorphous foils) made of an amorphous sheet.
Examples of the amorphous foil include cobalt-based amorphous metal (Co-Fe-Ni-B-Si) and iron-based amorphous metal.

As described above, the antenna core 20 and the sub magnetic path member 30 are attached to the first antenna frame 40 and the second antenna frame 50, and the first magnetic flux collecting plate 60 and the second magnetic flux member 60 are attached to the first lead portion 22 and the second lead portion 23. The antenna unit 2 as shown in FIG. 4 is configured by adhering the magnetism collecting plate 70.
Note that the coil winding work around the coil winding portion 21 may be performed before the antenna core 20 is attached to the first antenna frame 40 and the second antenna frame 50. Normally, however, the antenna core 20 is attached to the first antenna frame 40. It is preferable to perform this after attaching the frame 40 and the second antenna frame 50 and before attaching the sub magnetic path member 30.

As shown in FIGS. 2 and 3, the antenna unit 2 includes a first intermediate protrusion 42, a first core-side protrusion 43, a second intermediate protrusion 52, and a second core-side opening in the coil placement opening 5 </ b> A formed on the ground plane 5. The protrusion 53 is inserted. At this time, the surfaces of the first sub magnetic path side protrusion 44, the first locking protrusion 45, the wall portion 48, the second locking protrusion 55, and the wall portion 58 are brought into contact with the back surface of the main plate 5. The hook portions 46 and 56 are engaged with a dial receiving ring (not shown) arranged on the upper surface of the main plate 5.
Further, the projecting pin 571 formed in the projecting portion 57 is inserted into a positioning hole formed in the main plate 5. On the other hand, a positioning pin formed in the main plate 5 is inserted into the hole 441 formed in the first sub magnetic path side protrusion 44. Furthermore, a screw fixing cylindrical fixing portion formed on the base plate 5 is inserted into the insertion hole 49.

Accordingly, the first antenna frame 40 and the second antenna frame 50 are positioned with respect to the ground plane 5, and the antenna unit 2 can be arranged at a predetermined position on the ground plane 5. In addition, the antenna unit 2 is fixed to the ground plate 5 by screwing a screw into the cylindrical fixing portion inserted through the insertion hole 49 from the back cover side via a circuit board (not shown) or a magnetic-resistant plate.
Therefore, the antenna unit 2 is disposed on the outer peripheral portion of the ground plane 5, and the outer peripheral surfaces of the first antenna frame 40 and the second antenna frame 50 are substantially flush with the outer peripheral surface of the ground plane 5. Here, the coil winding part 21 is formed in a straight line, and the first lead part 22 and the second lead part 23 are curved. For this reason, the first lead portion 22 and the second lead portion 23 of the antenna core 20 are arranged substantially along the arc-shaped outer peripheral surface of the main plate 5.

Such an antenna unit 2 is disposed from 6 o'clock to 10 o'clock with respect to the center of the outer case 100 as shown in FIG. At this time, the sub magnetic path member 30 is arranged on the clock center side with respect to the antenna core 20.
On the other hand, the external operation member 6 is disposed at the 3 o'clock side of the outer case 100. The external operation member 6 includes a winding stem and a crown 7 disposed at the 3 o'clock position of the outer case 100 and buttons 8 and 9 disposed at the 2 o'clock position and the 4 o'clock position.

According to this embodiment, the following effects can be obtained.
(1) According to the present embodiment, since the first holding part 41 and the second holding part 51 are formed in the antenna frames 40 and 50, the antenna core 20 and the sub magnetic path member 30 are attached to the antenna frames 40 and 50. It can be positioned and attached to.
In particular, by attaching the antenna core 20 and the sub magnetic path member 30 with reference to the first intermediate protrusion 42 and the second intermediate protrusion 52 of the first holding part 41, the second holding part 51, each lead part of the antenna core 20 is provided. 22 and 23 and the end portions 31 and 32 of the sub magnetic path member 30 can be reliably and easily brought into close contact with each other.
And since the antenna core 20 and the sub magnetic path member 30 can be closely_contact | adhered, an eddy current loss can be made small and a receiving sensitivity can be improved. In particular, since the auxiliary magnetic path member 30 is arranged on the inside of the watch of the antenna core 20, it is possible to easily prevent the magnetic flux from flowing through the gears and the like inside the watch.

(2) Since the antenna frame is composed of the two members of the first antenna frame 40 and the second antenna frame 50, there is no need to stack the connecting portions of the antenna frames 40 and 50 on the coil winding portion 21, and the coil winding portion. Compared to the case where the coil is wound around the antenna frame 21 and the antenna frame, the coil diameter can be reduced if the number of turns is the same. For this reason, the antenna unit 2 can be thinned.
Further, even if the antenna frames 40 and 50 are divided into two members, the lead portions 22 and 23 of the antenna core 20 can be positioned and attached to the antenna frames 40 and 50. It can be used as a connecting portion between the frames 40 and 50 and can be easily integrated as the antenna unit 2.
In addition, the first intermediate protrusion 42, the first core-side protrusion 43, the second intermediate protrusion 52, and the second core-side protrusion 53 formed on each antenna frame 40, 50 are end portions of the coils wound around the coil winding portion 21. Therefore, the coil winding operation can be easily performed.

(3) Since the first magnetism collecting plate 60 and the second magnetism collecting plate 70 are in close contact with the lead portions 22 and 23, the magnetism collecting effect in the antenna core 20 can be enhanced, and the characteristics of the antenna can be improved. Therefore, the present invention includes the sub magnetic path member 30 and the magnetic flux collecting plates 60 and 70, so that the reception sensitivity can be improved while the antenna unit 2 is small, and a small radio timepiece such as a female wristwatch. 1 can also be configured easily.
Further, since the positioning portions for positioning the magnetic flux collecting plates 60 and 70 are provided in the antenna frames 40 and 50, it is possible to easily prevent the magnetic flux collecting plates 60 and 70 from protruding from the antenna frames 40 and 50. For this reason, when the antenna unit 2 is incorporated in a timepiece, the magnetic flux collecting plates 60 and 70 can be prevented from colliding with other components and being damaged.

(4) Since the hook portions 46 and 56 are provided on the antenna frames 40 and 50, the fixing work can be facilitated, and the plane area of the antenna unit 2 can be reduced. Can also be incorporated. Furthermore, since the antenna unit 2 is screwed not only by the hook portions 46 and 56 but also by screws inserted through the insertion holes 49, it can be securely fixed to the ground plane 5.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the antenna frame is configured by the two members of the first antenna frame 40 and the second antenna frame 50. However, the antenna frame is integrated with a connecting portion that connects the antenna frames 40 and 50. An antenna frame may be used.

  Furthermore, the structure of the 1st holding | maintenance part 41 and the 2nd holding | maintenance part 51 is not restricted to the thing of the said embodiment. For example, the first core side protrusion 43, the first sub magnetic path side protrusion 44, the second core side protrusion 53, and the second sub magnetic path side protrusion 54 are provided with a spring structure so that the antenna core 20 and the sub core The magnetic path members 30 may be configured to be urged and held in the directions approaching each other, that is, toward the first intermediate protrusions 42 and the second intermediate protrusions 52. In this case, the antenna core 20 and the sub magnetic path member 30 can be held without being bonded to the antenna frames 40 and 50, and assembling workability can be improved.

  The structure for fixing the antenna unit 2 to the ground plane 5 is not limited to that of the above embodiment. For example, in the above embodiment, the hook portions 46 and 56 are engaged with a dial receiving ring (not shown) disposed on the upper surface of the main plate 5, but may be engaged with the main plate 5. Further, a hook portion may be formed on the ground plate 5 side, and the antenna unit 2 may be held by the hook portion of the ground plate 5. Furthermore, you may fix with a screw | thread, without providing a hook part.

Although the magnetic current collecting plates 60 and 70 are not necessarily provided, it is preferable to provide the magnetic current collecting plates 60 and 70 in terms of improving the antenna characteristics.
Further, the magnetic current collecting plates 60 and 70 are not limited to those made of laminated amorphous foil, but may be a magnetic foil body such as a ferrite sheet, or those formed by mixing a synthetic resin with amorphous powder, A magnetic material such as a ferrite core may be used. However, it is preferable to use a magnetic foil body such as an amorphous foil or a ferrite sheet because the thickness dimension can be reduced and the magnetic characteristics are excellent.

  DESCRIPTION OF SYMBOLS 1 ... Radio timepiece, 2 ... Antenna unit, 3 ... Movement, 5 ... Ground plane, 20 ... Antenna core, 21 ... Coil winding part, 22 ... 1st lead part, 23 ... 2nd lead part, 30 ... Sub magnetic path member, DESCRIPTION OF SYMBOLS 31 ... 1st edge part, 32 ... 2nd edge part, 40 ... 1st antenna frame, 41 ... 1st holding part, 42 ... 1st intermediate protrusion, 43 ... 1st core side protrusion, 44 ... 1st sub Magnetic path side projection, 45 ... first locking projection, 46 ... hook portion, 47 ... projection portion, 48 ... wall portion, 49 ... insertion hole, 50 ... second antenna frame, 51 ... second holding portion, 52 ... second Intermediate projection, 53 ... second core side projection, 54 ... second sub magnetic path side projection, 55 ... second locking projection, 56 ... hook portion, 57 ... projection portion, 58 ... wall portion, 60 ... first magnetic flux collecting plate , 70: second magnetic collecting plate, 400, 500: holding surface.

Claims (7)

An antenna core;
A secondary magnetic path member;
A coil wound around the antenna core;
With an antenna frame,
The antenna core is
A coil winding portion around which the coil is wound;
A first lead portion formed continuously at the first end of the coil winding portion;
A second lead portion formed continuously at the second end of the coil winding portion,
The sub magnetic path member is
A first end that is an end on the first lead portion side;
A second end portion that is an end portion on the second lead portion side,
The antenna frame is
A first holding portion for holding the antenna core and the sub magnetic path member in a state in which the first end portion of the sub magnetic path member is in close contact with the side surface of the first lead portion of the antenna core;
A second holding portion for holding the antenna core and the sub magnetic path member in a state in which the second end of the sub magnetic path member is in close contact with a side surface of the second lead portion of the antenna core. A radio wave watch antenna unit. The radio wave watch antenna unit according to claim 1,
The coil winding portion is formed in a straight bar shape,
The sub magnetic path member is formed in a straight bar shape, and is arranged in parallel to the coil winding portion,
The first holding portion includes a first intermediate protrusion, a first core side protrusion, and a first sub magnetic path side protrusion, which are protruded from a holding surface of the antenna frame.
The second holding portion includes a second intermediate protrusion, a second core side protrusion, and a second sub magnetic path side protrusion, which are protruded from the holding surface of the antenna frame.
The holding groove formed between the first intermediate protrusion and the first core side protrusion holds the first end of the coil winding part,
The holding groove formed between the second intermediate protrusion and the second core side protrusion holds the second end of the coil winding part,
The holding groove formed between the first intermediate protrusion and the first auxiliary magnetic path side protrusion holds the first end side of the auxiliary magnetic path member,
The radio-controlled timepiece antenna unit, wherein the second end portion side of the sub magnetic path member is held in a holding groove formed between the second intermediate projection and the second sub magnetic path side projection. The radio timepiece antenna unit according to claim 2,
The antenna frame is
A first antenna frame having the first holding portion;
An antenna unit for a radio-controlled timepiece characterized by being composed of two members, a second antenna frame having the second holding portion. In the radio timepiece antenna unit according to claim 3,
The first antenna frame includes a first locking protrusion protruding from the holding surface and formed on an extension line of a holding groove formed between the first intermediate protrusion and the first core side protrusion. ,
The second antenna frame includes a second locking protrusion protruding from the holding surface and formed on an extension line of a holding groove formed between the second intermediate protrusion and the second core-side protrusion. ,
The first lead portion is positioned with respect to the first antenna frame by the first intermediate protrusion, the first core side protrusion, and the first locking protrusion,
The second timepiece lead portion is positioned with respect to the second antenna frame by the second intermediate projection, the second core side projection, and the second locking projection. In the radio timepiece antenna unit according to any one of claims 1 to 4,
The antenna frame is
A first positioning portion for positioning a first magnetic flux collecting plate in close contact with the surface of the first lead portion;
A radio-controlled timepiece antenna unit, comprising: a second positioning portion that positions a second magnetic flux collecting plate that is in close contact with the surface of the second lead portion. In the radio timepiece antenna unit according to any one of claims 1 to 5,
The antenna frame is formed with a hook portion that is detachably attached to a base plate of the radio timepiece. A radio timepiece comprising the radio timepiece antenna unit according to any one of claims 1 to 6.

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