JP2013040794A - Radio-controlled timepiece with solar battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio-controlled timepiece with a solar battery, which receives an ultrahigh frequency while having the less decrease in reception performance of a planar antenna and having a conductor film pattern low in manufacturing costs.SOLUTION: A radio-controlled timepiece with a solar battery includes: a planar antenna having a reception surface; and a solar cell substrate 11 which is provided on the side of the reception surface of the planar antenna and which has solar cells 11a and a floating conductor film 11b which is a conductor film electrically floating in at least a part of an area composed of a space 13a directly above the reception surface and its periphery 13b.

Description

  The present invention relates to a radio timepiece with a solar battery.

  A so-called radio timepiece that receives an external radio wave including time information and corrects the time held therein is also widely equipped with a solar cell. In such a radio timepiece with a solar cell, a solar cell is usually disposed on the back side of the dial, and the solar cell receives light transmitted through the dial to generate operating power.

  In general, a radio wave received by a radio clock is a long wave called a standard radio wave. This standard radio wave reception is geographically limited and has a drawback that it takes a long time to receive because it uses a low-frequency carrier wave. Therefore, in a global positioning system represented by GPS (Global Positioning System) A radio timepiece with a solar cell that receives the ultra-high frequency wave used has been proposed. For receiving such ultra high frequency waves, not a bar antenna used for receiving long wave radio waves but an antenna having a receiving surface in the incident direction of ultra high frequency waves, such as a patch antenna, a chip antenna, or a plate-like inverted F antenna. A planar antenna such as is used.

  By the way, the ultra high frequency wave has high straightness and is easily shielded by a conductor such as metal. Further, the planar antenna cannot receive unless radio waves are incident on the receiving surface. This means that if a conductor is present immediately above or around the receiving surface of the planar antenna, the receiving sensitivity is significantly reduced. For this reason, in a radio timepiece with a solar cell that receives extremely high frequency waves, it has been considered preferable to avoid forming a conductor film used for a solar cell or the like directly above and around the planar antenna as much as possible. For example, Patent Document 1 discloses a GPS wristwatch that receives a satellite signal from a GPS satellite and corrects the time based on GPS time information included in the satellite signal. A solar cell or a transparent electrode and a metal electrode are not formed at a nearby position, or a solar cell is formed in a mesh shape to reduce its occupation area.

JP 2010-96707 A

  Conductive films used in solar cells are formed in a batch on a substrate sheet by a process such as vapor deposition or sputtering. Therefore, the fine shape of the electrodes must be removed by patterning such as etching. It is manufactured by. However, in this pattern removal process, the area of the pattern to be removed is small, for example, it is easy to remove the conductor film in a linear shape, but it takes time to remove the conductor film in a plane over a wide area. Since the accuracy also decreases, the manufacturing cost increases.

  The present invention has been made in view of such circumstances, and the problem to be solved is with a solar cell that receives a very high frequency wave having a conductor film pattern with a low decrease in the reception performance of a planar antenna and a low manufacturing cost. It is to provide a radio clock.

  In order to solve the above problems, a radio timepiece with a solar cell according to the present invention is provided with a planar antenna having a receiving surface, and is disposed on the receiving surface side of the planar antenna, and the solar cell and immediately above the receiving surface. And a solar cell substrate having a floating conductive film that is a conductive film that is electrically floating in at least a part of a region including the periphery thereof.

  According to the present invention, there is provided a radio-controlled timepiece with a solar cell that receives a very high frequency wave having a conductor film pattern that is less likely to reduce the reception performance of a planar antenna and that is low in manufacturing cost.

It is a top view which shows the radio wave wristwatch with a solar cell concerning a 1st embodiment of the present invention. It is a top view which shows the solar cell board | substrate accommodated in the inside of the trunk | drum of a radio wave wristwatch with a solar cell. It is a fragmentary sectional view of the radio wave wristwatch with a solar cell by the III-III line of FIG. It is a top view which shows the solar cell board | substrate accommodated in the inside of the trunk | drum of the radio wave wristwatch with a solar cell which concerns on the 2nd Embodiment of this invention. It is a top view which shows the solar cell board | substrate accommodated inside the trunk | drum of the radio wave wristwatch with a solar cell which concerns on the 3rd Embodiment of this invention. It is a top view which shows the solar cell board | substrate accommodated in the inside of the trunk | drum of the radio wave wristwatch with a solar cell which concerns on the 4th Embodiment of this invention. It is a top view which shows the solar cell board | substrate accommodated in the inside of the trunk | drum of the radio wave wristwatch with a solar cell which concerns on the 5th Embodiment of this invention. It is a top view which shows the solar cell board | substrate accommodated inside the trunk | drum of the radio wave wristwatch with a solar cell which concerns on the 6th Embodiment of this invention. It is a top view which shows the solar cell board | substrate accommodated inside the trunk | drum of the radio wave wristwatch with a solar cell which concerns on the 7th Embodiment of this invention. It is a top view which shows the modification of a solar cell board | substrate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a radio wave wristwatch 100 with a solar cell according to the first embodiment of the present invention. The figure shows a case 1 that is the exterior (watch case) of a radio-controlled timepiece with solar cell, a dial 2 that is arranged in the case 1, and an hour hand 3, a minute hand 4, and a second hand 5 that are time indicating hands. Yes. Further, a crown 6 and a push button 7 for a user to perform various operations are arranged on the side surface of the trunk 1 on the 3 o'clock side. A band fixing portion 8 for fixing the band extends from the side surface of the trunk 1 on the 12 o'clock side and the 6 o'clock side.

  In addition, the design of the radio wave wristwatch 100 with a solar cell shown in the figure is an example. In addition to those shown here, for example, the body 1 may be square instead of round, and the presence / absence, number, and arrangement of the crown 6 and the push button 7 are arbitrary. Further, in the present embodiment, the hands are three hands of the hour hand 3, the minute hand 4, and the second hand 5, but the present invention is not limited to this, and even if the second hand 5 is omitted, the day of the week, the time zone or the presence / absence of summer time, the radio wave The reception status, remaining battery level, pointers for various displays, date display, and the like may be added.

  In the present specification, as described above, the term radio wave wristwatch with solar cell is used to indicate a radio timepiece having a solar cell and being a wristwatch. And in this embodiment, the radio wave wristwatch with solar cell 100 receives the satellite signal from the satellite that transmits the satellite signal including the date and time information such as the GPS satellite, and the information about the date and time included in the satellite signal, that is, Based on the reference information, it has a function of correcting the internal time, which is time information held in the wristwatch. However, the radio wave signal received by the solar wristwatch with solar battery 100 is not limited to a satellite signal, and is not particularly limited as long as the signal includes reference information. However, since the radio wave signal is preferably received by the planar antenna 14 described later, it is preferably a high-frequency signal from a short wave to a very high frequency. In the present embodiment, the radio wave wristwatch with solar cell 100 is a wristwatch, but it may be replaced with a table clock or a wall clock.

  In the radio wave wristwatch 100 with a solar battery, a windshield made of a transparent material such as glass is attached to the trunk 1 so as to cover the dial 2. A back cover is attached to the body 1 on the opposite side of the windshield. In the present specification, hereinafter, the radio-controlled wristwatch with solar cell 100 has the front side in the direction in which the windshield is arranged (front side in FIG. 1) and the back side in the direction in which the back cover is arranged (back direction in FIG. 1). Call it.

  A solar cell substrate 11 having a solar cell formed on the surface is disposed on the back side of the dial plate 2, and power is generated by light incident from the front side. Therefore, the dial 2 is made of a material that transmits light to some extent. As shown in FIG. 1, the solar cell substrate 11 has a substantially circular shape, and the 6 o'clock position is cut into a rectangular shape. On the back side of the dial 2, a planar antenna 12 for receiving a satellite signal is disposed at the cut portion. In the present specification, as described above, the term planar antenna is used to indicate an antenna having a receiving surface in the incident direction of a radio signal. In the present embodiment, the planar antenna 12 is a patch antenna, and the radio signal received thereby is a satellite signal from a GPS satellite, which is a very high frequency wave. The planar antenna 12 is provided with a power feed pin 12b so as to penetrate the thickness direction, and the front side surface is a reception surface 12a for receiving a radio signal. The receiving surface 12a of the planar antenna 12, the light receiving surface of the solar cell formed on the solar cell substrate 11, and the dial 2 are provided in parallel to each other, and all face the front side.

  In addition, a mechanism for driving the hands, a storage battery for accumulating the electric power generated by the solar battery, a controller for controlling the operation of the radio wristwatch 100 with the solar battery, etc. And a receiving circuit for processing a received satellite signal.

The dial 2 is wider than the opening on the front side of the cylinder 1, and the cylinder 1 covers the periphery. For this reason, the dial 2 is configured such that only the region (exposed region) inside the outline (parting line) X of the opening of the trunk 1 is visible from the outside through the windshield, and is outside the contour X. This region (non-exposed region) is hidden by the barrel 1 and cannot be seen from the outside.

FIG. 2 is a plan view showing the solar cell substrate 11 accommodated in the body 1 of the radio wave wristwatch 100 with solar cells.

  As shown in FIG. 2, the solar cell substrate 11 has a notch portion 11 c in which a 6 o'clock position from a substantially circular shape is cut out in a rectangular shape, and a plurality of engagements are provided on the periphery of the solar cell substrate 11 at positions separated from each other. A portion (uneven shape) is provided, and these engaging portions are engaged with the body 1 itself or a base plate which is a frame (not shown) housed in the body 1. Thereby, the solar cell board | substrate 11 is supported in the radio wave wristwatch 100 with a solar cell so that rotation is impossible. These engaging portions are formed outside the contour line X shown in FIG. 1 so that they cannot be seen through from the front side of the dial 2. Furthermore, an opening 11d for inserting the pointer shaft is formed in the center of the solar cell substrate 11, and a solar cell 11a which is a power generation unit including a conductor film and a semiconductor thin film on the surface, and a conductor film A floating conductor film 11b is formed. The floating conductor film 11b is an electrically floating conductor film. That is, it is not electrically connected to a part of an electric circuit included in the solar cell 11a or the radio wave wristwatch 100 with the solar cell or other conductive members such as the trunk 1. In this specification, a certain member “electrically floating” means that the member does not constitute any electric circuit or a part thereof. And as above-mentioned, the planar antenna 12 is arrange | positioned so that the receiving surface 12a may face the windshield side in the inner area | region of the notch part 11c of the 6 o'clock position.

  By the way, in the example shown in the figure, the solar cell 11a is divided into four and connected in series with each other. The floating conductor film 11b is divided around the opening 11d and is divided into two. However, these numbers, arrangements, and shapes are merely examples, and the number of solar cells 11a may be set appropriately so that a necessary voltage can be obtained, and the floating conductor film 11b will be described later. It may be divided so that it becomes a larger number, or may be provided so as to be only one.

  Then, the floating conductor film 11b is provided in at least a part of a region composed of the reception surface 13a of the planar antenna 12 and the periphery 13b. In FIG. 2, the shapes of the top 13a and the periphery 13b are indicated by broken lines. Here, the top 13a indicates a region overlapping the receiving surface 12a (see FIG. 1) of the planar antenna 12 in plan view, and the periphery 13b is in contact with the top 13a and is within a predetermined distance d from the top 13a. Pointing. Here, the distance d is determined by the reception performance of the planar antenna 12 when a conductive member that is not electrically floating (that is, a conductive member that constitutes some electric circuit or a part thereof) is disposed. It is reasonable to set a value that has an adverse effect, and it is determined empirically or experimentally.

  The meaning of this configuration is as follows. That is, if a conductive member that is not electrically floating, including the solar cell 11a, is disposed in a region composed of the upper part 13a and the periphery 13b, the reception performance of the planar antenna 12 is degraded. It is preferable not to arrange as many conductive members as possible. On the other hand, an electrically floating conductive member, such as the floating conductor film 11b, has little influence on the reception performance of the planar antenna 12 even if it is disposed in a region composed of the immediately above 13a and the periphery 13b. The reason for this is presumed that the movement of carriers such as electrons contained in the electrically floating conductive member is geometrically limited, so that the incident radio signal cannot be sufficiently reflected. . This means that a conductive member that is electrically floating may be disposed in a region composed of the top 13a and the periphery 13b.

  Therefore, in this embodiment, a conductor film that is more convenient to be left in the manufacturing process and that is located inside the region composed of the immediately above 13a and the periphery 13b is electrically floated, thereby The adverse effect on the reception performance of the antenna 12 is reduced. This does not mean that there must be a conductive member floating in both the upper part 13a and the periphery 13b, in this case, the floating conductor film 11b. The floating conductor film 11b may be disposed only on the top 13a or only on the periphery 13b, or may be disposed on a part thereof. Further, there is no problem even if the floating conductor film 11b is further arranged in a region other than the immediately upper portion 13a and the periphery 13b. In other words, the floating conductor film 11b is disposed in at least a part of a region including the area 13a immediately above the receiving surface 12a and the periphery 13b thereof.

  FIG. 3 is a partial cross-sectional view of the radio-controlled wristwatch with solar cell 100 taken along line III-III in FIG. As shown in the figure, the solar cell substrate 11 is disposed on the front side (that is, the receiving surface side) of the planar antenna 12, and the dial 2 is further disposed on the front side. In the present embodiment, the solar cell substrate 11 is not formed on the receiving surface 12a and the floating conductor film 11b is formed on the surface of the solar cell substrate 11 on the front side of the periphery 13b. And the solar cell 11a is formed in the surface of the solar cell board | substrate 11 in the further outer side (right side in the figure) of the periphery 13b. Here, the solar cell 11a includes, in order from the solar cell substrate 11, a conductor film 11a-1 such as a metal thin film, two layers of semiconductor films 11a-2 and 11a-3, and a transparent conductor film such as indium tin oxide and indium zinc oxide. 11a-4 are laminated in this order. On the other hand, in this embodiment, the floating conductor film 11b is made of a single metal thin film, and the material thereof is the same as that of the conductor film 11a-1. This is mainly due to manufacturing. After the conductor film 11a-1 is formed on the entire surface of the solar cell substrate 11, removal of the conductor film 11a with high accuracy over a wide range has a large process load. This is because the removal of 11a-2 and 11a-3 and the transparent conductor film 11a-4 is relatively easy (for example, a sacrificial layer may be formed on the floating conductor film 11b). However, the floating conductor film 11b only needs to be electrically floating, and is not limited to the configuration shown here. That is, the floating conductor film 11b may include a transparent conductor film (same as the transparent conductor film 11a-4) or a semiconductor film (same as the semiconductor films 11a-2 and 11a-3) in addition to the metal thin film. When the solar cell substrate 11 itself is transparent, the floating conductor film 11b and the solar cell 11a may be formed on the back surface of the solar cell substrate 11.

  By the way, in this embodiment, since the shape of the floating conductor film 11b is a shape along the periphery 13b as shown in FIG. 2, the outline of the floating conductor film 11b is the shape of the top 13a (that is, the planar antenna). 12 of the receiving surface 12a), and includes a large number of straight lines in the 12 o'clock -6 o'clock direction and the 3 o'clock -9 o'clock direction of the radio wave wristwatch 100 with solar cells. And as already demonstrated, since the dial 2 of the radio wave wristwatch 100 with solar cells is formed of a material that transmits light to some extent, the solar cell substrate 11 disposed on the back side thereof can be visually recognized. In general, the design of a watch is based on radiation and concentric circles centered on the pointer axis. Therefore, when the outline of the floating conductor film 11b is not along the radiation and concentric circles centered on the pointer axis, When many straight lines in the 12 o'clock to 6 o'clock direction are included as in the form, the outline of the floating conductor film 11b is visually recognized with a sense of incongruity, and the design of the watch as a whole may be impaired.

  Therefore, in the solar cell substrate 11 of the radio wave wristwatch 100 with the solar cell according to the second embodiment of the present invention shown in FIG. 4, at least a part of the outline of the floating conductor film 11b is radiation centered on the pointer axis. It is said. FIG. 4 is a plan view showing the solar cell substrate 11 accommodated in the trunk of the radio wave wristwatch 100 with solar cell according to the present embodiment. In the description of the present embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  In the present embodiment, at least a part of the outline of the floating conductor film 11b, and the part indicated by a thick line in FIG. I try not to damage it. It should be noted that at least a part of the outline of the floating conductor film 11b may be a radiation centered on the pointer axis as shown here, or an arc centered on the pointer axis, or both of them may be included. Good.

  Further, in this embodiment, as a result of using a part of the outline of the floating conductor film 11b as radiation centered on the pointer axis, the area of each floating conductor film 11b is increased as compared with the previous embodiment. ing. Here, as described above, the reason why the floating conductor film 11b does not greatly affect the reception performance of the planar antenna 12 is considered to be because the movement of carriers in the floating conductor film 11b is geometrically limited. However, this means that the size and shape of the electrically independent floating conductor film 11 b are related to the influence on the reception performance of the planar antenna 12. If the size of the floating conductor film 11b is increased and the degree of freedom of carrier movement is increased, the influence of the floating conductor film 11b on the reception performance of the planar antenna 12 is expected to increase. Therefore, it is not desirable to unnecessarily increase the size of the floating conductor film 11b. The area occupied by the floating conductor film 11b on the solar cell substrate 11 is at least an arbitrary (for example, the smallest) solar cell 11a. It is desirable that the area is smaller than the area occupied on the substrate 11.

  Further, in order to reduce the influence of the floating conductor film 11b on the reception performance of the planar antenna 12, the frequency of the radio signal that the solar cell radio-controlled wristwatch 100 is going to receive, the radio-controlled wristwatch with solar cell 100 itself, or the solar cell substrate 11. It is also effective to further divide the floating conductor film 11b into a plurality of parts in a manner that does not conduct each other according to the shape of the solar cell 11a.

  For example, in the solar cell substrate 11 of the radio wave wristwatch 100 with the solar cell according to the third embodiment of the present invention shown in FIG. 5, the floating conductor film 11b is divided into strips so as not to conduct each other. FIG. 5 is a plan view showing the solar cell substrate 11 accommodated in the trunk of the radio wave wristwatch 100 with solar cell according to the present embodiment. In the description of the present embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  In the drawing, the solid line extending in the 12 o'clock to 6 o'clock direction shown in the floating conductor film 11b is a dividing line of the floating conductor film 11b, and each floating conductor film has a number of strips elongated in the 12 o'clock to 6 o'clock direction. And are not conducting to each other. In this specification, “strip shape” refers to an elongated planar shape. Specifically, the ratio of the length in the minor axis direction to the major axis direction of a certain planar shape is 2 or more. Means. In addition, all of the divided floating conductor films 11b do not have to be in a strip shape, and it is sufficient that a part of the floating conductor film 11b includes a strip shape. In addition, the division direction, that is, the long side direction of the strip shape is coincident with the 12 o'clock to 6 o'clock direction of the radio wave wristwatch 100 with the solar cell, but this direction is arbitrary, and The direction may be the 3 o'clock to 9 o'clock direction or other directions. How this direction is determined and how the specific length and width of the strip shape are determined are determined empirically or experimentally in consideration of the influence on the reception performance of the planar antenna 12. Good.

  Furthermore, like the solar cell substrate 11 of the radio wave wristwatch with solar cell 100 according to the fourth embodiment of the present invention shown in FIG. 6, the floating conductor film 11b may be divided into a lattice shape so as not to conduct each other. . FIG. 6 is a plan view showing the solar cell substrate 11 accommodated in the trunk of the radio wave wristwatch 100 with solar cell according to the present embodiment. In the description of the present embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  In the figure, the lattice lines shown in the floating conductor film 11b are dividing lines of the floating conductor film 11b, and each floating conductor film is divided into a lattice shape and is not electrically connected to each other. Also in this case, the width and direction of the lattice dividing the floating conductor film 11b may be arbitrarily set.

  As shown in the third and fourth embodiments, the floating conductor film 11b is divided into strips or grids, and the geometric size of each floating conductor film is reduced. It is presumed that the movement of carriers in the conductor film can be appropriately restricted and reflection of incident radio signals can be effectively suppressed. However, the smaller the geometric size of the conductor film, the better. For example, in the case of the floating conductor film 11b shown in the third embodiment, it is considered that the movement of carriers in the 12 o'clock to 6 o'clock direction is not so limited as compared to other directions (see FIG. 5). In this case, the floating conductor film 11b according to the embodiment has different reflectivity compared to other directions with respect to radio waves having a specific polarization, for example, a linearly polarized wave in the 12 o'clock to 6 o'clock direction, for example, It is thought to be higher. For these reasons or other reasons, depending on the mode of division of the floating conductor film 11b, the transmissivity for a radio signal of a specific polarization or frequency is controlled. For example, other radio signals that interfere with each other or interference caused by multipath In some cases, the reception performance of the planar antenna 12 with respect to a desired radio wave signal can be improved or the decrease thereof can be suppressed.

  In all of the embodiments described so far, the solar cell substrate 11 has the cutout portion 11c, and the floating conductor film 11b is not disposed directly above the planar antenna 12, but the floating conductor film 11b is directly above. You may make it arrange | position to 13a. FIG. 7 is a plan view showing a solar cell substrate 11 accommodated in the case of a radio wave wristwatch 100 with solar cell according to the fifth embodiment of the present invention. In the description of the present embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  In the present embodiment, the solar cell substrate 11 is not provided with the notch portion 11c (see, for example, FIG. 2), and the floating conductor film 11b is also provided directly above 13a. And the floating conductor film 11b is divided | segmented into the grid | lattice form similarly to 4th Embodiment demonstrated previously. In addition, the example shown here is an example, and may be divided into strips as in the third embodiment, or may be divided into other shapes. Even if it does in this way, as long as a radio wave signal is transmitted without being reflected by the floating conductor film 11b and enters the reception surface 12a, it is considered that the influence on the reception performance of the planar antenna 12 is limited.

  Furthermore, the influence of the shape of the outline of the floating conductor film 11b on the reception performance of the planar antenna 12 may be affected depending on the aspect of the radio wave wristwatch 100 with solar cells or the deflection state of the radio signal to be received. .

  FIG. 8: is a top view which shows the solar cell board | substrate 11 accommodated in the inside of the trunk | drum of the radio wave wristwatch 100 with a solar cell which concerns on the 6th Embodiment of this invention. In the description of the present embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  In the solar cell substrate 11 according to the present embodiment, the outline of the floating conductor film 11b is a bent line. Here, the outline of the floating conductor film 11b is not only a line defining the outline of the floating conductor film 11b at the boundary separating the floating conductor film 11b and the solar cell 11a, but also a plurality of floating conductor films 11b are electrically connected to each other. It also means a dividing line that is divided in a manner that does not.

  Here, the “bent line” is a line that is not a straight line connecting two points and has a certain curvature or is bent many times, for example, three times or more. In the example shown in FIG. 8, the outline of the floating conductor film 11b is a wavy line as a bent line. However, other than this, even if it is a saw blade shape, it is an arc or elliptical arc that draws a gentle curve. Also good. Further, it is not necessary to make all the outlines of the floating conductor film 11b be bent lines, and it is sufficient that at least a part, preferably a length of half or more of the outline lines is a bent line. With such a shape, it is considered that the influence of the floating conductor film 11b on the reception performance of the planar antenna 12 may be further reduced.

  In the fifth and sixth embodiments described above and the seventh embodiment and modifications described below, the solar cell substrate 11 is not cut out directly above the planar antenna 12 and the floating conductor film 11b is disposed. ing. In such a structure, since the solar cell substrate 11 can be formed into a substantially circular flat plate without being cut out, the solar cell substrate 11 has high strength and is easy to handle. When neither the solar cell 11a nor the floating conductor film 11b is disposed directly on the planar antenna 12, the planar antenna is viewed from the front side through the transparent or translucent dial 2 as shown in FIG. The 12 receiving surfaces 12a are directly visually recognized. If it does so, the design of the solar cell equipped radio-controlled wristwatch 100 may be impaired due to the difference in appearance between the solar cell 11a and the receiving surface 12a in other regions. On the other hand, the design of the entire radio-controlled wristwatch 100 with solar cells can be made uniform by disposing the floating conductor film 11b directly above the planar antenna 12 and covering the receiving surface 12a. it can.

  FIG. 9 is a plan view showing a solar cell substrate 11 accommodated in the case of the radio-controlled wristwatch 100 with solar cell according to the seventh embodiment of the present invention. In the description of the present embodiment, the same members as those in the previous embodiment are denoted by the same reference numerals, and redundant description will be omitted.

  In the solar cell substrate 11 according to the present embodiment, the solar cell substrate 11 does not have the notch portion 11c, and the fifth described above in that the floating conductor film 11b is disposed immediately above the planar antenna 12. This is the same as the embodiment. In this embodiment, a display window 11e in which the floating conductor film 11b is not formed is provided in a part of the floating conductor film 11b in the upper portion 13a.

  To explain this point, as described above, the floating conductor film 11b is a conductor thin film and does not transmit light or has low transparency. Therefore, by providing the display window 11e, a member arranged on the further back side of the solar cell substrate 11 can be seen from the surface. Although the object visually recognized from this display window 11e is not specifically limited, As a typical thing, digital display surfaces, such as display surfaces, such as a date wheel and a day-of-the-week car, a vehicle display surface which shows a time zone, LCD (liquid crystal display) Is mentioned. Moreover, the display window 11e is sufficient if the floating conductor film 11b is not formed when the solar cell substrate 11 itself is transparent. However, when the solar cell substrate 11 is opaque, the display window 11e is sunlit together with the floating conductor film 11b. It becomes a hole provided in the battery substrate 11 itself.

  In each of the embodiments described above, a planar antenna is provided at the 6 o'clock position of the solar cell radio-controlled wristwatch 100, and the floating conductor film 11b is not surrounded by the solar cell 11a at or near the 6 o'clock position. Although it was formed to the outer peripheral part of the solar cell board | substrate 11, it may not necessarily be limited to this. For example, as shown in FIG. 10, when the planar antenna 12 is disposed near the center of the radio wave wristwatch 100 with a solar cell, the floating conductor film 11b may be disposed so as to be surrounded by the solar cell 11a. In this case, the floating conductor film 11b does not necessarily have to be disposed on the periphery 13b so as to surround the upper portion 13a, but may be disposed on at least a part thereof as described above. In the modification shown in FIG. 10, the floating conductor film 11b is disposed on the periphery 13b in the 12 o'clock, 3 o'clock, and 9 o'clock directions immediately above the 13a, but the floating conductor film 11b is disposed on the periphery 13b in the 6 o'clock direction. Not placed.

  In the above-described fifth to seventh embodiments and modifications, the floating conductor film 11b is illustrated as being divided into a plurality of parts in a manner that does not conduct each other (see FIGS. 7 to 10), but is not necessarily limited thereto. However, if there is no problem in the reception performance of the planar antenna 12, the floating conductor film 11b may be a single one without being divided.

  The specific configuration shown in the embodiment described above is an exemplification, and those skilled in the art may make various modifications. For example, the shape and number of each member or part thereof may be changed as appropriate, and need not be the same as illustrated.

  In addition, in one viewpoint of embodiment of this invention demonstrated above, the area of a floating conductor film is smaller than the area of a solar cell. This is because if the area of the floating conductor film is large, it is considered that the reception performance is adversely affected.

  Moreover, in another viewpoint of embodiment of this invention, the floating conductor film is divided | segmented into plurality in the aspect which is not mutually connected. In this way, the size of each floating conductor film is reduced, and the influence on reception performance can be reduced.

  Moreover, in another viewpoint of embodiment of this invention, the floating conductor film is divided | segmented into strip shape. Alternatively, the floating conductor film is divided into a lattice shape. If it does in this way, the influence which a floating conductor film has on reception performance according to the mode of a radio timepiece with a solar cell and the radio signal which it is going to receive can be reduced.

  In another aspect of the embodiment of the present invention, at least a part of the outline of the floating conductor film is a bent line. Even if it does in this way, the influence which a floating conductor film has on reception performance according to the mode of a radio timepiece with a solar cell and the radio signal which it is going to receive can be reduced.

  Moreover, in another viewpoint of embodiment of this invention, a solar cell board | substrate is not formed directly on the said receiving surface. In this way, it is possible to exclude the conductor member from directly above the receiving surface, which is an area considered to have the greatest influence on the planar antenna.

  Further, in another aspect of the embodiment of the present invention, the floating conductor film covers a portion directly above the receiving surface, and the display window in which the floating conductor film is not formed on at least a part of the floating conductor film immediately above the receiving surface. Is formed. If it does in this way, a display window will be formed in the floating conductor film which does not contribute to power generation, and the area of a solar cell will not be reduced.

  Moreover, in another viewpoint of embodiment of this invention, at least one part of the outline of a floating conductor film is a radiation or circular arc centering on a pointer axis | shaft. If it does in this way, the design on the external appearance of the radio timepiece with a solar cell is not spoiled.

  1 barrel, 2 dial, 3 hour hand, 4 minute hand, 5 second hand, 6 crown, 7 push button, 8 band fixing part, 11 solar cell substrate, 11a solar cell, 11a-1 conductor film, 11a-2, 11a-3 Semiconductor film, 11a-4 transparent conductor film, 11b floating conductor film, 11c notch, 11d opening, 11e display window, 12 plane antenna, 12a receiving surface, 12b feeding pin, just above 13a, around 13b, 100 radio wave watch with solar cell .

Claims (9)

A planar antenna having a receiving surface;
A solar cell and a floating conductor film, which is a conductor film that is electrically floating in at least a part of a region formed immediately above and around the reception surface, disposed on the reception surface side of the planar antenna; A solar cell substrate having,
Radio clock with solar battery.   The radio timepiece with solar cell according to claim 1, wherein an area of the floating conductor film is smaller than an area of the solar cell.   The radio wave timepiece with a solar cell according to claim 1 or 2, wherein the floating conductor film is divided into a plurality of portions so as not to conduct each other.   The radio timepiece with solar cell according to claim 3, wherein the floating conductor film is divided into strips.   The radio timepiece with solar cell according to claim 3, wherein the floating conductor film is divided into a lattice shape.   The radio timepiece with a solar cell according to claim 1, wherein at least a part of the outline of the floating conductor film is a bent line.   The radio timepiece with solar cell according to claim 1, wherein the solar cell substrate is not formed immediately above the receiving surface.   7. The display device according to claim 1, wherein the floating conductor film covers an area directly above the receiving surface, and a display window in which the floating conductor film is not formed is formed on at least a part of the floating conductor film immediately above the receiving surface. Radio wave watch with solar cell according to Crab.   The radio timepiece with a solar cell according to any one of claims 1 to 8, wherein at least a part of an outline of the floating conductor film is a radiation or an arc centered on a pointer axis.

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