JP7424963B2 - Arrangement structure of electronic clock and antenna and metal display member in electronic clock - Google Patents

Description

The present invention relates to an electronic timepiece and an arrangement structure of an antenna and a metal display member in the electronic timepiece.

For example, electronic watches are known that include an antenna for receiving standard radio waves and the like containing time information. The antenna built into a watch is made by winding an insulated metal wire around a core made of ferrite or the like to form a coil (wire winding).

Furthermore, an antenna has been proposed in which metal reception lead plates disposed at positions shifted in the thickness direction of the watch are connected to cores protruding from both ends of the coil (for example, see Patent Document 1). In an antenna with reception lead plates connected in this way, the reception lead plate can be arranged in a plane different from the core. Therefore, it is possible to reduce the installation space on the same plane as the coil and prevent or suppress a decrease in reception sensitivity due to the short core.

Japanese Patent Application Publication No. 2016-090507

By the way, when an antenna is covered with metal, the reception sensitivity of radio waves decreases. Since the case of a watch, including the back cover, is often made of metal, the back cover side is covered with metal, but the dial side is not covered with metal, so radio waves are received on the dial side. be exposed.

However, a metal indicator wheel is sometimes placed on the dial side as well, and the metal indicator wheel is arranged so as not to cover the antenna when viewed from the dial side.

For example, in small electronic watches such as women's watches, the space for placing parts is smaller than in men's watches, so the metal display wheel may be arranged to cover part of the antenna. Sometimes you have no choice but to do it.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to suppress a decrease in reception sensitivity of the antenna in an arrangement structure in which a metal display member covers a part of the antenna. The object of the present invention is to provide an arrangement structure with a display member and an electronic timepiece.

A first aspect of the present invention includes an antenna that receives radio waves by having a coil wound around a core, and a metal display member, and the antenna extends from an end of the coil in the core to an outside of the coil. comprising a magnetic flux collector having a protruding core end or a receiving lead plate that functions together with the core end as an extension of the core end, and in plan view, the display member overlaps a part of the antenna, This is an arrangement structure of an antenna and a metal display member in an electronic timepiece, in which the display member is arranged so as not to overlap with a portion of the magnetic flux collecting portion that projects linearly from the coil.

A second aspect of the present invention is an electronic timepiece having an arrangement structure of an antenna and a metal display member in the electronic timepiece according to the present invention.

According to the arrangement structure of the antenna and the metal display member in the electronic timepiece and the electronic timepiece according to the present invention, in the electronic timepiece in which the metal display member covers a part of the antenna, the reception sensitivity of the antenna is reduced. Can be suppressed.

FIG. 2 is a plan view showing an electronic timepiece. FIG. 2 is a plan view showing the arrangement of antennas in the movement of the electronic timepiece shown in FIG. 1. FIG. 3 is a plan view showing the arrangement structure of an antenna and a metal display wheel in the movement shown in FIG. 2. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an electronic timepiece and an arrangement structure of an antenna and a metal display member in the electronic timepiece according to the present invention will be described with reference to the drawings.

1 is a plan view showing the electronic watch 100, FIG. 2 is a plan view showing the arrangement of the antenna 20 in the movement 1 of the electronic watch 100 shown in FIG. 1, and FIG. 3 is a plan view showing the antenna 20 and metal in the movement 1 shown in FIG. FIG.

The illustrated electronic timepiece 100 is an embodiment of the electronic timepiece according to the present invention. Further, the arrangement structure of the antenna 20 and the metal display wheel 30 in the movement 1 of the electronic timepiece 100 is an embodiment of the arrangement structure of the antenna and the metal display member in the electronic timepiece according to the present invention.

The electronic timepiece 100 includes a movement 1, a dial 92, a display wheel 30, an antenna 20, and hands such as an hour hand 93, a minute hand 94, and a second hand 95 inside a case 91. The hands are driven by a step motor provided in the movement 1, and indicate the time by pointing to the hour characters displayed on the dial 92.

The dial 92 is made of resin and is formed into a disk shape. Therefore, the dial 92 can transmit radio waves. At the 6 o'clock position of the dial 92, a substantially fan-shaped opening 92a having an arc concentric with an arc that is the outer peripheral edge of the dial is formed.

The display wheel 30 is made of metal such as aluminum or aluminum alloy, and has a disk shape. The display wheel 30 has an illustration of a crescent moon that gives the impression of night and an illustration of the sun that gives the impression of daytime, on the surface of the disk, in diagonal areas across the center of the disk (180 degrees apart from each other). area).

The display wheel 30 is arranged on the back side of the dial 92 in such a way that the arc that is the fan-shaped outer periphery of the opening 92a of the dial 92 and the arc of the disc are concentric circles. Then, the display wheel 30 rotates once every 24 hours with the center of the disk as the rotation center.

As a result, as shown in FIG. 1, a part of the disc of the display wheel 30 can be seen from the front side of the electronic watch 100 through the opening 92a. The illustration is set so that the illustration of the crescent moon is visible through the opening 92a, and the time period corresponding to night is set so that the illustration of the crescent moon is visible through the opening 92a. Thereby, by visually checking the display of the display vehicle 30 through the opening 92a, it is possible to recognize at a glance whether it is nighttime or daytime.

The electronic timepiece 100 includes a winding stem 96 extending from the movement 1 to the outside of the case 91, and a crown 97 is fixed to the tip of the winding stem 96 for rotating the winding stem 96 around an axis. As the winding stem 96 rotates around the axis, the pointer rotates and the pointer is aligned. The winding stem 96 of the electronic timepiece 100 of this embodiment is provided at the 3 o'clock position on the dial 92.

The antenna 20 receives standard radio waves containing time information, and the electronic watch 100 automatically adjusts the position of the hands based on the standard radio waves received by the antenna 20.

As shown in FIG. 2, the antenna 20 includes a core 22, a coil 21, connection blocks 23a, 23b, and reception lead plates 24a, 24b. The antenna 20 is arranged so that the center of the coil 21 is located at the 7:30 o'clock position on the dial 92.

The core 22 is made of ferrite, for example. The core 22 is made up of a core part 22c around which an electric wire is wound as a coil 21, and end parts 22a and 22b (core ends) connected to the core part 22c and protruding outward from both ends 21a and 21b of the coil 21. is formed. The core portion 22c and the end portions 22a, 22b are formed in a straight line. No electric wire is wound around the ends 22a and 22b.

An extended portion of the end portion 22a that protrudes linearly from the coil 21, that is, a portion on the extension line L of the linear core portion 22c (for example, approximately at the 6 o'clock position of the dial 92) is formed of ferrite. Rectangular parallelepiped connection blocks 23a having a predetermined thickness are connected.

Similarly, the extended portion of the end portion 22b that protrudes linearly from the coil 21, that is, the portion on the extended line L of the linear core portion 22c (for example, approximately at the 9 o'clock position of the dial 92), A rectangular parallelepiped connection block 23b made of ferrite and having a predetermined thickness is connected.

Although the two connection blocks 23a and 23b are formed with the same thickness, they may be formed with mutually different thicknesses.

The reception lead plates 24a and 24b are flat plates each having an arc shape, and both are made of an amorphous material (magnetic material). The circular arcs of the reception lead plates 24a and 24b are concentric with the circular arc of the outer periphery of the dial plate 92.

The reception lead plate 24a is connected to the surface of the rectangular parallelepiped connection block 23a opposite to the surface to which the end portion 22a is connected (the surface opposite in the thickness direction). As a result, the end portion 22a of the core 22 and the reception lead plate 24a are arranged to be shifted in the thickness direction of the electronic watch 100 by the thickness of the connection block 23a, and the antenna 20 is occupied in the same plane. This prevents the area from increasing and increases the degree of freedom in arranging the antenna 20.

The reception lead plate 24b is also connected to the surface of the rectangular parallelepiped connection block 23b opposite to the surface to which the end portion 22b is connected (the surface opposite in the thickness direction). As a result, the end portion 22b of the core 22 and the reception lead plate 24b are arranged to be shifted in the thickness direction of the electronic watch 100 by the thickness of the connection block 23b, and the antenna 20 is occupied in the same plane. This prevents the area from increasing and increases the degree of freedom in arranging the antenna 20.

The ends 22a, 22b of the core 22, the connection blocks 23a, 23b, and the reception lead plates 24a, 24b are provided to increase the reception sensitivity of standard radio waves. The receiving lead plates 24a and 24b constitute magnetic collecting parts 25a and 25b that collect radio waves. In this way, the reception lead plates 24a and 24b extend the ends 22a and 22b of the core 22, respectively, and function as the antenna 20.

In the present embodiment, the magnetic flux collector 25a is composed of the end 22a of the core 22, the connection block 23a, and the reception lead plate 24a, and the magnetic flux collector 25b is composed of the end 22b of the core 22, the connection block 23b, and the reception lead plate 24a. Although it is configured with the receiving lead plate 24b, the connecting blocks 23a, 23b and the receiving lead plates 24a, 24b are not provided, and the magnetic collecting part 25a is formed only with the end 22a of the core 22, and the magnetic collecting part 25a is formed only with the end 22b of the core 22. The magnetic portion 25b may also be configured.

In this embodiment, the magnetic flux collector 25a and the magnetic flux collector 25b are formed with different lengths, but may be formed with the same length.

The antenna 20 configured in this way is arranged on the back side of the dial 92 and the display wheel 30, as shown in FIG.

In a plan view in the thickness direction of the electronic watch 100, a part of the antenna 20 overlaps the display wheel 30, but a portion 26a of the magnetic collecting parts 25a and 25b that protrudes linearly from the coil 21, 26b (portions of the ends 22a, 22b of the core 22, the connection blocks 23a, 23b, and the reception lead plates 24a, 24b on the extension line L along the core 22c) have an arrangement structure in which the display wheels 30 do not overlap. It has become.

Here, the back side of the electronic watch 100 is covered with a metal case (back cover) that blocks standard radio waves, and the front side is covered with a windshield glass and a resin dial 92 through which standard radio waves are transmitted. is located. Therefore, the antenna 20 of the electronic timepiece 100 receives the standard radio wave incident from the front side of the electronic timepiece 100.

However, if a metal member is placed on the front surface side of the antenna 20 and the metal member overlaps the antenna 20 in plan view, it is generally not possible to receive standard radio waves by the antenna 20. It is thought that this causes a decrease in sensitivity.

On the other hand, according to the research of the inventor of the present application, in the antenna 20, the parts 26a and 26b of the magnetic collecting parts 25a and 25b that protrude linearly from the coil 21 are arranged in such a way that they do not overlap with metal members. It turns out that if there is, the reception sensitivity will not decrease significantly.

The reason for this is that the lines of magnetic force distributed outside the coil 21 converge at the ends 22a and 22b of the core 22 so as to return to the inside of the coil 21, so the density of the lines of magnetic force in the antenna 20 is higher than in other parts, and the lines of magnetic force It is presumed that this is because the receiving sensitivity is greatly reduced by covering the areas with high density with metal members.

Therefore, similarly to the ends 22a and 22b of the core 22, by covering the portions 26a and 26b of the magnetic flux collectors 25a and 25b that protrude linearly from the coil 21 with metal members, the receiving sensitivity is greatly reduced. It is estimated that this is because

On the other hand, in the arrangement structure of the antenna 20 and the display wheel 30 of the present embodiment, the metal display wheel 30 is attached to the portions 26a, 26b of the magnetic collecting parts 25a, 25b that protrude linearly from the coil 21. However, since they are not overlapped in a plan view, the reception sensitivity of the standard radio wave by the antenna 20 does not decrease, or a significant decrease in reception sensitivity can be suppressed.

Note that it is more preferable if both ends 21a and 21b of the coil are arranged in such a manner that they do not overlap with metal members, since this can further suppress a decrease in reception sensitivity.

As described above, even if the antenna 20 and the metal display wheel 30 are forced to overlap in a plan view due to reasons such as the small size of the electronic watch 100 in a plan view, the present embodiment can be used. According to the electronic timepiece 100 and the arrangement structure of the antenna 20 and the metal display wheel 30 in the electronic timepiece 100, a decrease in reception sensitivity of the antenna can be prevented or suppressed.

The arrangement structure of the antenna 20 and the metal display wheel 30 in the electronic watch 100 and the electronic watch 100 of the present embodiment is that the antenna 20 has an antenna main body (coil 21 and core 22) and reception lead plates 24a and 24b. , are antennas of separate structure connected by connecting blocks 23a and 23b.

However, the arrangement structure of the antenna and the metal display member in the electronic timepiece and electronic timepiece according to the present invention is not limited to one in which the antenna 20 is a separate structure. That is, in this embodiment, the core 22 in the antenna body is formed to be long and extended like the reception lead plates 24a and 24b, and this long portion of the core 22 also functions as the reception lead plates 24a and 24b. It can be made into In this case, there is no need to provide connection blocks 23a, 23b.

In this way, even if the antenna 20 has an integral structure in which the antenna main body and the reception lead plates 24a, 24b are integrally formed, the portions 26a, 26b of the magnetic collecting parts 25a, 25b that protrude linearly from the coil 21. By having the arrangement structure in which the metal display wheels 30 are not overlapped in a plan view, it is possible to prevent or suppress a decrease in reception sensitivity of standard radio waves by the antenna 20.

The antenna 20 in the arrangement structure of the electronic watch 100, antenna 20, and metal display wheel 30 of this embodiment receives standard radio waves, but the electronic watch, antenna, and metal display member according to the present invention The antenna in the arrangement structure is not limited to one that receives standard radio waves, but may be one that receives other radio waves.

Further, the display wheel 30 in the arrangement structure of the electronic watch 100 and the antenna 20 and the metal display wheel 30 of this embodiment is for visually confirming whether it is daytime or nighttime. The display member in the electronic watch and the arrangement structure of the antenna and the metal display member according to the invention is not limited to one for visually confirming whether it is daytime or nighttime, and may include illustrations corresponding to the phases of the moon. It may be possible to display the age of the moon, or it may be to display the date or day of the week.

Furthermore, in the arrangement structure of the electronic watch 100, the antenna 20, and the metal display wheel 30 of the present embodiment, both of the portions 26a, 26b of the magnetic flux collectors 25a, 25b that protrude linearly from the coil 21, The display wheels 30 are arranged so that they do not overlap in a plan view, and a portion 26a (or a portion 26b that projects linearly) of one of the magnetic collecting portions 25a (or magnetic collecting portion 25b) linearly projects from the coil 21. In this case, the display wheels 30 do not overlap in plan view, and the part 26b (or the part 26a, which projects linearly) of the other magnetic flux collector 25b (or magnetic flux collector 25a) extends linearly from the coil 21. does not include an arrangement in which the display wheels 30 overlap in plan view.

However, when the core 22 does not protrude from both ends of the coil 21, but the core 22 protrudes only from one end of the coil 21 and does not protrude from the other end of the coil 21. The arrangement structure in which the display wheel 30 does not overlap the part of the magnetism collecting part on the side that projects from the coil 21 that projects linearly from the coil 21 in a plan view is an antenna in the electronic timepiece and electronic timepiece according to the present invention. Included in the arrangement structure with metal display members.

Further, the display wheel 30 in the electronic timepiece 100 of the present embodiment and the arrangement structure of the antenna 20 and the metal display wheel 30 displays specific items by rotating movement, but the electronic timepiece according to the present invention The display member in the arrangement structure of the antenna and the metal display member may not be a rotating display wheel, but may be one that displays a specific item without moving.

1 Movement 20 Antenna 21 Coils 22a, 22b Ends 22c Cores 23a, 23b Connection blocks 24a, 24b Reception lead plate 30 Display wheel 92 Dial plate 100 Electronic watch L Extension line

Claims (5)

An antenna having a coil wound around a core to receive radio waves, a dial having an aperture formed therein and capable of transmitting radio waves without rotating, and a rotating metal display having at least a portion exposed through the aperture. comprising a member;
The antenna includes a magnetic flux collector having a core end protruding from an end of the coil to the outside of the coil, or a receiving lead plate functioning as an extension of the core end together with the core end. Prepare,
An antenna for an electronic timepiece, wherein the display member overlaps a part of the antenna when viewed in plan, and the display member does not overlap a portion of the magnetic flux collecting portion that protrudes linearly from the coil. Arrangement structure of and metal display members. 2. The arrangement structure of an antenna and a metal display member in an electronic timepiece according to claim 1, wherein the display member is arranged so as not to overlap both ends of the coil in plan view. The arrangement structure of an antenna and a metal display member in an electronic timepiece according to claim 1 or 2, wherein the display member is arranged to overlap with the antenna on the dial side of the electronic timepiece. The magnetic collecting part is
comprising the core end, a reception lead plate that functions as an extension of the core end, and a connection block that connects the core end and the reception lead plate,
4. The arrangement structure of an antenna and a metal display member in an electronic timepiece according to claim 1, wherein the display member is arranged so as not to overlap the connection block in plan view. An electronic timepiece comprising an arrangement structure of an antenna and a metal display member according to any one of claims 1 to 4.