JP7115962B2 - SOLAR BATTERY GENERATING DEVICE, SOLAR BATTERY WATCH, AND DIAL - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power generation device with a solar battery, a timepiece with a solar battery, and a dial.

Patent Literature 1 discloses a timepiece dial that is light transmissive and allows external light to enter a solar cell. Further, the dial disclosed in Patent Document 1 has a transparent substrate and light reflecting layers arranged on the upper and lower surfaces of the transparent substrate so as to have gaps at predetermined intervals. It is configured such that a part of the light is transmitted and the other part is reflected.

JP-A-11-52067

Here, in the dial disclosed in Patent Document 1, part of the light is reflected on the upper surface of the transparent substrate before entering the light reflecting layer provided on the lower surface of the transparent substrate. Therefore, the amount of light incident on the light reflecting layer provided on the lower surface of the transparent substrate is smaller than the amount of light incident on the light reflecting layer provided on the upper surface of the transparent substrate. Therefore, the amount of light reflected by the light reflecting layer provided on the lower surface of the transparent substrate is smaller than the amount of light reflected by the light reflecting layer provided on the upper surface of the transparent substrate. As a result, when viewed from the user, the color of the dial may become uneven, and the aesthetics may deteriorate.

The present invention has been made in view of the above problems, and an object of the present invention is to improve aesthetics while maintaining the amount of power generated in a power generator with a solar cell.

The invention disclosed in the present application for solving the above problems has various aspects, and the outlines of typical aspects are as follows.

(1) At least a portion of a light-transmitting substrate, a first reflective layer partially provided on a viewing surface of the light-transmitting substrate, and a back surface opposite to the viewing surface in plan view a second reflective layer provided in a region that does not overlap with the first reflective layer; The light reflectance of the reflective layer of (1) is higher than the light reflectance of the first reflective layer.

(2) In the power generator with a solar cell in (1), a part of the second reflective layer overlaps the first reflective layer in a plan view.

(3) In (2), the portion of the second reflective layer that overlaps with the first reflective layer in plan view has a higher light reflectance than the portion that does not overlap with the first reflective layer. Generator with battery.

(4) In any one of (1) to (3), including a plurality of the first reflective layers and a plurality of the second reflective layers, the light transmissive substrate, in plan view, has the a plurality of first overlapping regions overlapping the first reflective layer but not overlapping the second reflective layer; and a plurality of second overlapping regions overlapping the second reflective layer but not overlapping the first reflective layer. and wherein the first overlap region and the second overlap region are alternately provided.

(5) In (4), the light transmissive substrate overlaps the first reflective layer and the second reflective layer between the first overlapping region and the second overlapping region that are adjacent to each other. A solar-powered generator comprising a third overlapping region.

(6) In any one of (1) to (5), the viewing surface is a flat surface, and the first reflective layer and the second reflective layer are arranged so that light incident perpendicularly to the viewing surface is provided so as to be incident on at least one of the first reflective layer and the second reflective layer.

(7) In any one of (1) to (6), the first reflective layer and the second reflective layer are such that at least part of the light incident on the viewing surface at an angle is A power generator with a solar cell provided so that the light enters the solar cell without passing through the first reflective layer and the second reflective layer.

(8) In any one of (1) to (7), the first reflective layer and the second reflective layer contain a pigment, and the second reflective layer is the first reflective layer. A power generator with a solar cell, wherein the proportion of the pigment is higher than the above.

(9) In (8), the particle size of the pigment contained in the second reflective layer and the particle size of the pigment contained in the first reflective layer are different sizes. .

(10) The power generator with a solar cell in (8) or (9), wherein the pigment is white.

(11) In any one of (1) to (7), the first reflective layer and the second reflective layer are made of metal.

(12) In any one of (1) to (11), the thickness of the second reflective layer is thicker than the thickness of the first reflective layer.

(13) In any one of (1) to (12), the solar cell-equipped power generating device has an antireflection film provided at least in a region of the visible surface where the first reflective layer is not provided in plan view. .

(14) A solar-powered timepiece including the solar-powered power generation device according to any one of (1) to (13), wherein the decorative plate is a dial plate.

(15) At least a part of the light-transmissive substrate, the first reflective layer partially provided on the visible surface of the light-transmissive substrate, and the back surface opposite to the visible surface in plan view and a second reflective layer provided in a region that does not overlap with the first reflective layer, the dial allowing light to enter the solar cell by transmitting light, wherein the light reflection of the second reflective layer index is higher than the light reflectance of the first reflective layer.

According to aspects (1) to (15) of the present invention, aesthetics can be improved while maintaining the amount of power generation.

1 is a plan view showing a solar battery watch according to a first embodiment; FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; It is a top view showing an example of a dial. It is a top view showing an example of a dial. FIG. 2 is a cross-sectional view showing the dial and solar cell of the first embodiment; It is a figure which shows typically the incident light and reflected light in a 1st reflective layer and a 2nd reflective layer. FIG. 5 is a cross-sectional view showing a dial of a second embodiment; FIG. 11 is a cross-sectional view showing a dial of a third embodiment; FIG. 11 is a cross-sectional view showing a dial of a fourth embodiment; FIG. 11 is a cross-sectional view showing a dial of a fifth embodiment; FIG. 11 is a cross-sectional view showing a dial of a sixth embodiment;

Hereinafter, each embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a plan view showing a solar-powered timepiece according to the first embodiment. FIG. 2 is a cross-sectional view taken along line AA of FIG. In FIG. 2, the crown 13, which will be described later, is omitted from the illustration, and in order to make the arrangement of the hands easier to understand, the minute hand 16 is directed toward 9 o'clock, and the hour hand 15 and second hand 17 are directed toward 3 o'clock. It shows a state facing the direction of

FIG. 1 shows a case 10, which is the exterior (watch case) of the solar-powered timepiece 1, a dial 14, which is a decorative plate arranged inside the case 10, an hour hand 15, a minute hand 16, and a second hand 17, which are hands indicating the time. It is shown. In addition, hour characters 49 are provided at predetermined positions on the dial 14 . Band fixing portions 11 for fixing the band extend from the sides of the trunk 10 on the 12 o'clock side and the 6 o'clock side. A button 12 and a crown 13 are arranged on the side of the barrel 10 on the 3 o'clock side for the user to perform various operations.

Note that the clock design shown in FIG. 1 is an example. In addition to what is shown here, for example, the barrel 10 may be rectangular instead of round, and the presence/absence, number, and arrangement of buttons 12 and crown 13 are arbitrary. In FIG. 1, the hands are three hands, the hour hand 15, the minute hand 16, and the second hand 17. However, the present invention is not limited to this, and the second hand 17 may be omitted. , radio wave reception status, remaining battery level, pointers for various displays, date display, and the like may be added.

In this specification, the solar-powered timepiece 1 receives a satellite signal from a satellite that transmits a satellite signal including information on date and time, such as a GPS (Global Positioning System) satellite, and 1 shows a satellite radio-controlled wristwatch having the function of correcting the internal time held inside the watch based on information about the time. However, it is not limited to this, and it may be a radio-controlled watch that receives a general standard radio wave and adjusts the internal time, or a watch that does not have such a time-adjusting function.

As shown in FIG. 2 , the solar-powered timepiece 1 has a windshield 32 made of a transparent material such as glass so as to cover the dial 14 , and the windshield 32 is attached to the case 10 . A back cover 36 is attached to the case 10 on the opposite side of the windshield 32 . In this specification, hereinafter, the side on which the windshield 32 of the watch is arranged (the front side of the paper in FIG. 1) is the viewing surface side or the upper side, and the side on which the back cover 36 is arranged (the back side of the paper in FIG. 1) is the back side. It is called the side or bottom side. In addition, the surface on the viewing surface side of each configuration is also called the upper surface, and the surface on the rear surface side is also called the lower surface.

A solar cell 30 is arranged on the back side of the dial 14 . The solar cell 30 generates electricity when external light that has passed through the dial 14 is incident thereon. The configuration of the dial 14 and the details of light transmission and reflection on the dial 14 will be described later.

The solar cell 30 includes a semiconductor layer made of silicon or the like, and electrode layers disposed on the upper and lower surfaces of the semiconductor layer. Electric charges generated in the semiconductor layer due to the incidence of external light are collected by the electrode layers. and supplies power from the electrode layer to the storage battery.

In the first embodiment, as indicated by the dashed line in FIG. 1 , the solar cell 30 has a circular planar shape and is provided so that its center is positioned at the center C of the dial 14 . A patch antenna 20 for receiving satellite signals is arranged in an area where the solar cell 30 does not exist on the back side of the dial 14 . In this way, by arranging patch antenna 20 so as not to overlap solar cell 30 in plan view, it is possible to suppress the influence of the electrodes included in solar cell 30 on the reception sensitivity of patch antenna 20 . In the first embodiment, the patch antenna 20, which is a planar antenna for receiving satellite signals, is taken as an example of the antenna, but the present invention is not limited to this, and is for receiving radio waves including time information and the like. Other types of antennas may be used if available. Further, in the first embodiment, a radio-controlled timepiece having an antenna will be described as an example, but the present invention is not limited to radio-controlled timepieces. In that case, since it is not necessary to consider the influence on the reception sensitivity, the solar cell 30 may be provided so as to overlap the entire dial 14 . With such a configuration, the light receiving area of the solar cell 30 can be increased, and the power generation efficiency can be improved.

As shown in FIG. 2 , the solar-powered timepiece 1 further has a movement 38 provided below the solar cell 30 . The movement 38 includes a train wheel and a motor for driving hands, a clock circuit including a crystal oscillator for keeping time, a controller for controlling the entire solar-powered clock 1, etc., all assembled together in a frame called a main plate. be. The movement 38 operates by receiving power from a storage battery attached to the movement 38 . The storage battery stores power generated by the solar cell 30 while supplying power to the movement 38, and is, for example, a button-type lithium secondary battery.

In the first embodiment, solar cell 30 is provided integrally with movement 38 . Further, the movement 38 is provided with a pointer shaft protruding from the viewing surface of the dial plate 14, and the second hand 17, minute hand 16 and hour hand 15 are attached to the tip of the pointer shaft. A windshield 32 is fixed to the trunk 10 so as to cover them.

FIG. 3 is a plan view showing an example of a dial. The dial 14 includes a light-transmissive substrate 60 having a circular planar shape, a plurality of first reflective layers 70 provided in stripes on a viewing surface 60a (see FIG. 5) of the light-transmissive substrate 60, and a light-transmissive and a plurality of second reflective layers 80 provided in stripes on the rear surface 60b (see FIG. 5) opposite to the viewing surface 60a of the substrate 60. As shown in FIG.

The shapes of the first reflective layer 70 and the second reflective layer 80 are not limited to those shown in FIG. should be provided in For example, as shown in FIG. 4, they may be provided concentrically on the light transmissive substrate 60 . Alternatively, it may be provided in a spiral shape or radially.

The light-transmissive substrate 60 may be made of polycarbonate resin or acrylic resin, for example. Moreover, it is not limited to these materials, and may be made of a material that transmits light. For example, a fluorinated resin, an ethylene-based resin, or the like may be used.

In the first embodiment, the first reflective layer 70 and the second reflective layer 80 are preferably white layers made by mixing a white pigment into a light-transmissive resin. As the light-transmitting resin, the same material as that used for the light-transmitting substrate 60 may be used, or another material may be used.

In the first reflective layer 70 and the second reflective layer 80, the whiteness of the dial 14 and the light transmittance and light reflectance of the dial 14 are adjusted according to the concentration of the pigment. Since the light incident on the reflective layer is scattered at the interface between the resin and the pigment in the reflective layer, the larger the total surface area of the interface between the resin and the pigment, that is, the higher the concentration of the pigment, the higher the light reflectance. get higher

When the concentration of the pigment is increased, the whiteness of the dial 14 increases, but the amount of light reflected by the dial 14 increases and the amount of light transmitted through the dial 14 decreases. The amount of incident light is reduced. As a result, the amount of power generated by the solar cell 30 is reduced.

When the concentration of the pigment is lowered, the color of the dial 14 becomes lighter, while the amount of light reflected by the dial 14 decreases and the amount of light transmitted through the dial 14 increases. The amount of incident light increases. As a result, the amount of power generated by the solar cell 30 increases.

Furthermore, with reference to FIG. 5, the configuration of the dial 14 of the first embodiment and the details of light transmission through the dial 14 will be described. FIG. 5 is a cross-sectional view showing the dial and the solar cell of the first embodiment, and is a cross-sectional view taken along line VV in FIG. 3 or a cross-sectional view taken along line VV in FIG.

In FIG. 5, the direction indicated by the arrow indicates the direction in which light travels. Solid arrows indicate incident light before entering the dial 14 , and dotted arrows indicate transmitted light that has entered and passed through any interface on the dial 14 . Part of the light incident on any interface on the dial 14 is reflected, but the reflected light is not shown in FIG. Also, although FIG. 5 is a cross-sectional view, hatching is omitted to avoid complication of the drawing. The same applies to subsequent figures.

Here, since the solar cell 30 has a unique dark purple color, it is preferable from the aesthetic point of view that the solar cell 30 should not be visually recognized by the user. When the light reflectance of the dial 14 is high, the user will perceive the color of the dial 14 , making it difficult to visually recognize the solar cell 30 arranged on the back side of the dial 14 . On the other hand, when the amount of light transmitted through the dial 14 is small, the amount of power generated by the solar cell 30 is reduced. Here, the light reflectance is the ratio of the reflected light flux to the light flux incident on the interface between substances having different refractive indices. Further, the light reflectance of the first reflective layer 70 means that the reflected luminous flux with respect to the luminous flux incident on the first reflective layer 70 in contact with a predetermined substance such as air or a substrate. is the ratio of The same applies to the light reflectance of the second reflective layer 80 .

In the first embodiment, since the first reflective layer 70 and the second reflective layer 80 contain a white pigment, the light reflected by at least one of the first reflective layer 70 and the second reflective layer 80 As a result, the user visually recognizes white.

As described above, the dial 14 is provided on the light transmissive substrate 60, the plurality of first reflective layers 70 provided on the viewing surface 60a of the light transmissive substrate 60, and the rear surface 60b of the light transmissive substrate 60. and a plurality of second reflective layers 80 .

In the first embodiment, the first reflective layer 70 is partially provided on the viewing surface 60 a of the light transmissive substrate 60 . Specifically, as shown in FIG. 3, a plurality of first reflective layers 70 are arranged in stripes at predetermined intervals. Also, the second reflective layer 80 is provided on the back surface 60b of the light transmissive substrate 60 so that a part of the second reflective layer 80 does not overlap the first reflective layer 70 in plan view. Specifically, as shown in FIG. 3, a plurality of second reflective layers 80 are arranged in stripes at predetermined intervals.

In addition, in the first embodiment, as shown in FIG. 5, the first reflective layer 70 and the second reflective layer 80 are alternately provided so as to partially overlap in plan view.

Also, in the first embodiment, the first reflective layer 70 includes a resin layer 71 and a white pigment 72 contained in the resin layer 71 . Similarly, the second reflective layer 80 includes a resin layer 81 and white pigment 82 contained in the resin layer 81 .

In the following description, a region of the light transmissive substrate 60 that overlaps with the first reflective layer 70 but does not overlap with the second reflective layer 80 in plan view is referred to as a first overlapping region E1. A region of the light transmissive substrate 60 that overlaps with the second reflective layer 80 but does not overlap with the first reflective layer 70 in plan view is referred to as a second overlapping region E2. A region of the light transmissive substrate 60 that overlaps both the first reflective layer 70 and the second reflective layer 80 in plan view is referred to as a third overlapping region E3. As shown in FIG. 5, the first overlapping regions E1 and the second overlapping regions E2 are provided alternately, and the third overlapping region E3 is formed between the first overlapping regions E1 and the second overlapping regions E1 adjacent to each other. It is provided between the overlapping regions E2.

In FIG. 5, incident light L1 is light incident on the light-transmitting substrate 60 perpendicularly to the first overlapping region E1, and light incident on the second overlapping region E2 is denoted by L1. is shown as incident light L2, and the light incident on the third overlapping area E3 is shown as incident light L3.

Part of the incident light L1 is reflected on the upper surface of the first reflective layer 70, and another part of the light is transmitted, and enters the light transmissive substrate 60 as transmitted light L11. A part of the transmitted light L11 is reflected on the upper surface of the light transmissive substrate 60, and another part of the transmitted light L11 is transmitted, and enters the solar cell 30 as a transmitted light L12.

Part of the incident light L2 is reflected on the upper surface of the light transmissive substrate 60, and another part of the light is transmitted, and enters the second reflective layer 80 as the transmitted light L21. Transmitted light L21 is partly reflected and partly transmitted on the upper surface of second reflective layer 80, and enters solar cell 30 as transmitted light L22.

A part of the incident light L3 is reflected on the upper surface of the first reflective layer 70, and another part of the incident light L3 is transmitted, and enters the light transmissive substrate 60 as a transmitted light L31. A part of the transmitted light L31 is reflected on the upper surface of the light transmissive substrate 60, and another part of the transmitted light L31 is transmitted, and enters the second reflective layer 80 as a transmitted light L32. Transmitted light L32 is partly reflected and partly transmitted by the upper surface of second reflective layer 80, and enters solar cell 30 as transmitted light L33.

Also, in FIG. 5, the light that is obliquely incident on the light transmissive substrate 60 does not pass through the first reflective layer 70 and the second reflective layer 80, and is transmitted only through the light transmissive substrate 60. This light is shown as incident light L4. Part of the incident light L4 is reflected on the upper surface of the light transmissive substrate 60, another part of the light is transmitted, and enters the solar cell 30 as the transmitted light L41.

Here, the amount of light incident on the second reflective layer 80 (transmitted light L21) is smaller than the amount of light incident on the first reflective layer 70 (incident light L1). As described above, the amount of light incident on the second reflective layer 80 is at least the light that has passed through the light-transmissive substrate 60 and is at least partially reflected on the upper surface of the light-transmissive substrate 60. be. Also, since the light transmitted through the light-transmissive substrate 60 is attenuated in the light-transmissive substrate 60, the amount of light incident on the second reflective layer 80 is less than the amount of light that Therefore, for example, when the light reflectance of the first reflective layer 70 and the light reflectance of the second reflective layer 80 are the same, the second overlapped area E2 is larger than the first overlapped area E1. becomes dark, and the color of the dial 14 becomes uneven.

Therefore, in the first embodiment, the ratio of the pigments 82 contained in the second reflective layer 80 is made higher than the ratio of the pigments 72 contained in the first reflective layer 70 . That is, the light reflectance of the second reflective layer 80 is made higher than the light reflectance of the first reflective layer 70 .

FIG. 6 is a diagram schematically showing incident light and reflected light on the first reflective layer and the second reflective layer. In FIG. 6, the direction indicated by the arrow indicates the direction in which light travels, and the number of arrows schematically indicates the amount of light. In addition, FIG. 6 shows the user's eyes U viewing the dial 14 from the viewing surface 60a side.

As shown in FIG. 6, the light is directly incident on the first reflective layer 70 from the air layer, and the amount of incident light is large. Reflected light is generated according to the amount of incident light.

On the other hand, the light transmitted through the light-transmissive substrate 60 is incident on the second reflective layer 80 , and the amount of incident light is greater than the amount of light incident on the first reflective layer 70 . less. However, in the first embodiment, since the concentration of the pigments 82 contained in the second reflective layer 80 is set higher than the concentration of the pigments 72 contained in the first reflective layer 70, the second reflective layer 80 The light reflectance is higher than that of the first reflective layer 70 . Therefore, the ratio of reflected light to incident light is higher in the second reflective layer 80 than in the first reflective layer 70 . The concentration of the pigment 82 contained in the second reflective layer 80 is preferably about 30%.

In the first embodiment described above, the difference between the amount of light reflected by the second reflective layer 80 and the amount of light reflected by the first reflective layer 70 can be reduced, and the amount of light reflected by the dial 14 can be reduced. It is possible to reduce unevenness in the amount of light. As a result, the color unevenness of the dial 14 is reduced, and the aesthetics are improved.

In addition, in the first embodiment, since the first reflective layer 70 and the second reflective layer 80 are alternately arranged, as shown in FIG. A part of the light that is emitted is incident on the solar cell 30 without passing through the first reflective layer 70 and the second reflective layer 80 . Therefore, the amount of light incident on the solar cell 30 can be ensured, and the amount of power generation can be maintained.

In addition, in the first embodiment, since a part of the second reflective layer 80 overlaps the first reflective layer 70 in plan view, the second reflective layer 80 is arranged in the manufacturing process. Even if the above error occurs, there is no area in the light transmissive substrate 60 where neither the first reflective layer 70 nor the second reflective layer 80 is provided. Therefore, the light incident perpendicularly to the light transmissive substrate 60 does not enter the solar cell 30 without passing through either the first reflective layer 70 or the second reflective layer 80 . Therefore, when the user views the dial 14 from the front, it is difficult for the solar cell 30 to be visually recognized. That is, aesthetics are not deteriorated.

In addition, in the first embodiment, since a part of the second reflective layer 80 overlaps the first reflective layer 70 in a plan view, the light incident on the light transmissive substrate 60 is obliquely incident. Since more of the light L4 (see FIG. 5) is incident on the second reflective layer 80, even when the user views the dial 14 obliquely, color unevenness is less noticeable.

It is essential that a part of the second reflective layer 80 overlaps with the first reflective layer 70 in plan view, that is, that the light transmissive substrate 60 has the third overlapping region E3. is not. That is, the first reflective layer 70 and the second reflective layer 80 may be alternately provided without overlapping each other. In this case, of the incident light L4 (see FIG. 5) obliquely incident on the light transmissive substrate 60, the amount of light incident on the solar cell 30 without passing through the second reflective layer 80 increases. The power generation amount of the battery 30 is improved. However, even in this case, it is preferable that there is no region in the light transmissive substrate 60 in which neither the first reflective layer 70 nor the second reflective layer 80 is provided in plan view. That is, in the first reflective layer 70 and the second reflective layer 80, light incident perpendicularly to the viewing surface 60a is incident on at least one of the first reflective layer 70 and the second reflective layer 80. It should be provided so that

In each of the above-described embodiments, the first reflective layer 70 and the second reflective layer 80 are layers formed by mixing a white pigment into a light-transmitting resin, but the present invention is not limited to this. Instead, a layer containing a pigment of a color other than white may be used. Also, when a radio-controlled clock is employed, it is preferable to use a non-conductive material as the material of the pigment in consideration of the influence on the reception sensitivity of the antenna. Further, the layer is not limited to a layer formed by mixing a pigment with a resin, and a metal layer having light transmittance and light reflectance may be used. In that case, it is preferable to select a material or adjust the film thickness so that the light reflectance of the second reflective layer 80 is higher than that of the first reflective layer 70 . As a result, it is possible to suppress the occurrence of uneven reflection on the dial 14 and improve aesthetics. In particular, when a radio-controlled clock is adopted, it is necessary to appropriately determine the thickness and size of the metal layer as a reflective layer, taking into consideration the influence on the reception sensitivity of the antenna.

Also, in the first embodiment, the total volume of the first reflective layer 70 provided on the light transmissive substrate 60 is made larger than the total volume of the second reflective layer 80 . As a result, the material used for the second reflective layer 80 containing a large amount of pigment can be reduced, the pigment can be saved, and the cost can be reduced.

Next, the dial 214 of the second embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view showing the dial of the second embodiment. The same reference numerals are used for the same configurations as those described in the first embodiment, and detailed description thereof will be omitted.

In the second embodiment, as shown in FIG. 7, of the viewing surface 60a and the back surface 60b of the light transmissive substrate 60, the regions where the first reflective layer 70 and the second reflective layer 80 are not provided , an antireflection film 90 is provided. By providing the antireflection film 90 in this manner, the reflection of light at the interface between the light transmissive substrate 60 and the air layer can be suppressed, and the luster of the dial 214 can be suppressed. That is, the appearance of the dial 214 can be made matte.

In FIG. 7, the antireflection film 90 is applied to a region of the visible surface 60a where the first reflective layer 70 is not provided (the second overlapping region E2 shown in FIG. An example in which the second reflective layer 80 is not provided (the first superimposed region E1 shown in FIG. 5) will be described, but the present invention is not limited to this, and at least the first reflective layer of the viewing surface 60a is provided. It suffices if it is arranged in a region where the layer 70 is not provided.

For example, the back surface 60b may not be provided with the antireflection film 90. FIG. Also, an antireflection film 90 may be provided on the entire surface on the viewing surface 60a side. That is, the antireflection film 90 may be provided on the upper surface of the first reflective layer 70 as well. When the antireflection film 90 is partially provided, it is necessary to form the film using a mask or the like. be able to.

Next, the dial 314 of the third embodiment will be described with reference to FIG. FIG. 8 is a cross-sectional view showing the dial of the third embodiment. The same reference numerals are used for the same configurations as those described in the first embodiment, and detailed description thereof will be omitted.

In the third embodiment, the second reflective layer 80 is provided in a region of the rear surface 60b that does not overlap with the first reflective layer 70 in plan view, and the first reflective layer 70 and a second reflective layer 380 provided in the overlapping region.

In the third embodiment, the second reflective layer 80 includes a resin layer 81 and a white pigment 82 contained in the resin layer 81, as in the first embodiment. The second reflective layer 380 includes a resin layer 381 and white pigment 382 contained in the resin layer 381 .

The light reflectance of the second reflective layer 380 is made higher than the light reflectance of the second reflective layer 80 . Specifically, the ratio of the pigment 382 contained in the second reflective layer 380 was made higher than the ratio of the pigment 82 contained in the second reflective layer 80 .

Here, it is known that the light reflectance depends on the angle of incidence (Fresnel's equation). Specifically, it is known that the larger the incident angle of the light incident on the interface, the larger the light reflectance, and the smaller the incident angle, the smaller the light reflectance. In other words, it is known that the greater the incident angle of the light incident on the interface, the smaller the light transmittance, and the smaller the incident angle, the greater the light transmittance. That is, the light transmittance is the highest for light incident on the interface perpendicularly (incident angle 0 degree). Here, the light reflectance is the ratio of the reflected light flux to the light flux incident on the interface between substances having different refractive indices. Also, the light transmittance is the ratio of the transmitted light flux to the light flux incident on the interface between different substances.

Therefore, of the light L shown in FIG. is smaller than the amount of light incident on the second reflective layer 80 . Therefore, when the second reflective layer 380 and the second reflective layer 80 have the same light reflectance, the amount of light reflected by the second reflective layer 380 is less than the amount of light reflected. In that case, the vicinity of the second reflective layer 380 becomes dark, and color unevenness occurs on the dial 314 .

In the third embodiment, as described above, the light reflectance of the second reflective layer 380 and the light reflectance of the second reflective layer 80 are increased. , the difference between the amount of reflected light on the second reflective layer 380 and the amount of reflected light can be reduced, and the unevenness in the amount of reflected light on the dial 314 can be reduced. As a result, color unevenness on the dial 314 is reduced, and aesthetics are improved.

Next, a dial 414 of a fourth embodiment will be described with reference to FIG. FIG. 9 is a cross-sectional view showing the dial of the fourth embodiment. The same reference numerals are used for the same configurations as those described in the third embodiment, and detailed description thereof will be omitted.

In the fourth embodiment, the second reflective layer 380 shown in FIG. 8 is provided so as to cover the second reflective layer 80 . That is, the second reflective layer 380 was also provided in a region (the second overlapping region E2 shown in FIG. 5) that does not overlap the first reflective layer 70 in plan view. With such a configuration, the second reflective layer 380 can be provided more easily than the configuration shown in the third embodiment. In the third embodiment, after providing the second reflective layer 80, it is necessary to provide the second reflective layers 380 on both sides of the second reflective layer 80 using a mask or the like. It is difficult to provide two reflective layers 380 . In contrast, in the fourth embodiment, the second reflective layer 380 adjacent to one second reflective layer 80 may be integrally provided, and the second reflective layer 380 can be easily provided. is.

Next, the dial 514 of the fifth embodiment will be described with reference to FIG. FIG. 10 is a cross-sectional view showing the dial of the fifth embodiment. The same reference numerals are used for the same configurations as those described in the first embodiment, and detailed description thereof will be omitted.

In the fifth embodiment, a second reflective layer 580 is provided on the rear surface 60b of the light transmissive substrate 60. FIG. The second reflective layer 580 includes a resin layer 581 and white pigment 582 contained in the resin layer 581 .

In the fifth embodiment, the film thickness of the second reflective layer 580 is made thicker than the film thickness of the first reflective layer 70 . When the ratio of the pigment contained in the reflective layer is the same, the thicker the film, the larger the amount of the pigment contained, so the light reflectance increases. Therefore, the light reflectance of the second reflective layer 580 is higher than the light reflectance of the first reflective layer 70 . In the configuration of the fifth embodiment, similarly to the first embodiment, it is possible to reduce color unevenness of the dial 514 and improve aesthetics. In addition, in the fifth embodiment, since the materials of the first reflective layer 70 and the second reflective layer 580 are the same, there is no need to produce materials with different pigment ratios, which simplifies the manufacturing process. can reduce costs.

Next, the dial 614 of the sixth embodiment will be described with reference to FIG. FIG. 11 is a cross-sectional view showing the dial of the sixth embodiment. The same reference numerals are used for the same configurations as those described in the first embodiment, and detailed description thereof will be omitted.

In the sixth embodiment, a second reflective layer 680 is provided on the rear surface 60b of the light transmissive substrate 60. As shown in FIG. The second reflective layer 680 includes a resin layer 681 and white pigment 682 contained in the resin layer 681 .

In the sixth embodiment, the particle size of the pigment 682 contained in the second reflective layer 680 and the particle size of the pigment 72 contained in the first reflective layer 70 are made different. Here, according to the findings of the applicant of the present application, scattering is most likely to occur in the reflective layer when the particle size of the pigment is about half the wavelength of the incident light. Therefore, the particle size of the pigment 682 contained in the second reflective layer 680 is half the wavelength of the light incident on the second reflective layer 680, and the pigment contained in the first reflective layer 70 The particle size of Pigment 72 was smaller than that of Pigment 682. With such a configuration, the light reflectance of the second reflective layer 680 becomes higher than the light reflectance of the first reflective layer 70 . In the configuration of the sixth embodiment, as in the first embodiment, it is possible to reduce color unevenness of the dial 614 and improve aesthetics.

FIG. 11 shows an example in which the particle diameter of the pigment 682 contained in the second reflective layer 680 is larger than the particle diameter of the pigment 72 contained in the first reflective layer 70, but the wavelength of the incident light The particle diameter of the pigment 682 may be smaller than the particle diameter of the pigment 72 in relation to the length of . In any case, the particle diameter of the pigment 682 is approximately half the wavelength of the incident light, and the particle diameter of the pigment 72 is larger than the particle diameter of the incident light. It is preferable that the size is away from one-half the wavelength of the light. From the viewpoint of saving pigment and reducing cost, the particle diameter of pigment 682 is half the wavelength of incident light, and the particle diameter of pigment 72 is the same as that of pigment 682. It can be said that it is preferable to make it smaller than .

The means for making the light reflectance of the second reflective layer 80 higher than the light reflectance of the first reflective layer 70 is not limited to those described in the above embodiments. For example, the material may be selected so that the difference between the refractive index of the resin layer contained in the reflective layer and the refractive index of the pigment is greater in the second reflective layer 80 than in the first reflective layer 70. . This is because light is reflected at the interface between the resin layer and the pigment, and if there is a large difference in refractive index between the resin layer and the pigment, the light incident on the reflective layer is more likely to scatter and the light reflectance increases.

In each of the above-described embodiments, the solar battery timepiece 1 has been described as an example, but the present invention is not limited to this. If it is For example, it may be a sensor or a power generation device with a solar cell for lighting equipment.

Although the embodiment according to the present invention has been described above, the specific configuration shown in this embodiment is shown as an example, and it is not intended to limit the technical scope of the present invention to this. Those skilled in the art may modify these disclosed embodiments as appropriate, and it should be understood that the technical scope of the invention disclosed herein includes such modifications.

1 solar battery watch, 10 case, 11 band fixing part, 12 button, 13 crown, 14, 214, 314, 414, 514, 614 dial, 15 hour hand, 16 minute hand, 17 second hand, 20 patch antenna, 30 solar battery , 32 windshield, 36 back cover, 38 movement, 49 hour letter, 60 light transmissive substrate, 70 first reflective layer, 80, 380, 580, 680 second light reflective layer.

Claims (13)

At least a portion of a light-transmitting substrate, a first reflective layer partially provided on a viewing surface of the light-transmitting substrate, and a back surface opposite to the viewing surface is at least part of the first reflecting layer in plan view. a decorative plate having a second reflective layer provided in a region that does not overlap with the reflective layer;
a solar cell that generates power when light transmitted through the decorative plate is incident;
including
The light reflectance of the second reflective layer is higher than the light reflectance of the first reflective layer,
The first reflective layer and the second reflective layer contain a pigment,
The second reflective layer has a higher proportion of the pigment than the first reflective layer,
Power generator with solar cells. At least a portion of a light-transmitting substrate, a first reflective layer partially provided on a viewing surface of the light-transmitting substrate, and a back surface opposite to the viewing surface is at least part of the first reflecting layer in plan view. a decorative plate having a second reflective layer provided in a region that does not overlap with the reflective layer;
a solar cell that generates power when light transmitted through the decorative plate is incident;
including
The light reflectance of the second reflective layer is higher than the light reflectance of the first reflective layer,
A portion of the second reflective layer overlaps the first reflective layer in plan view,
A portion of the second reflective layer that overlaps with the first reflective layer in plan view has a higher light reflectance than a portion that does not overlap with the first reflective layer.
Power generator with solar cells. wherein the first reflective layer and the second reflective layer are made of metal;
The power generator with a solar cell according to claim 2 . a plurality of the first reflective layers;
a plurality of the second reflective layers;
including
The light transmissive substrate includes, in a plan view, a plurality of first overlapping regions overlapping with the first reflective layer but not overlapping with the second reflective layer, and a plurality of first overlapping regions overlapping with the second reflective layer. and a plurality of second overlap regions that do not overlap with the layers;
The first overlapping area and the second overlapping area are provided alternately,
A power generator with a solar cell according to any one of claims 1 to 3. The light-transmissive substrate includes a third overlapping region overlapping the first reflective layer and the second reflective layer between the first overlapping region and the second overlapping region adjacent to each other.
The power generator with a solar cell according to claim 4. The viewing surface is flat,
The first reflective layer and the second reflective layer are arranged such that light incident perpendicularly to the viewing surface is incident on at least one of the first reflective layer and the second reflective layer. provided in the
The power generator with a solar cell according to any one of claims 1 to 5. In the first reflective layer and the second reflective layer, at least part of the light incident on the viewing surface at an angle does not pass through the first reflective layer and the second reflective layer. provided to be incident on the solar cell,
A power generator with a solar cell according to any one of claims 1 to 6. The particle size of the pigment contained in the second reflective layer and the particle size of the pigment contained in the first reflective layer are different sizes.
The power generator with a solar cell according to claim 1 . the pigment is white,
The power generator with a solar cell according to claim 1 or 8 . the film thickness of the second reflective layer is thicker than the film thickness of the first reflective layer;
A power generator with a solar cell according to any one of claims 1 to 9 . In plan view, at least an antireflection film provided on a region of the viewing surface where the first reflective layer is not provided,
A power generator with a solar cell according to any one of claims 1 to 10 . A power generator with a solar cell according to any one of claims 1 to 11 ,
The decorative plate is a dial plate,
A clock with a solar battery. a light transmissive substrate;
a first reflective layer partially provided on the viewing surface of the light transmissive substrate;
a second reflective layer provided in a region where at least a portion of the rear surface opposite to the viewing surface does not overlap the first reflective layer in plan view;
A dial that allows light to enter the solar cell by transmitting light,
The light reflectance of the second reflective layer is higher than the light reflectance of the first reflective layer,
The first reflective layer and the second reflective layer contain a pigment,
The second reflective layer has a higher proportion of the pigment than the first reflective layer,
dial.

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