JP2021067591A - Timepiece with solar battery and method of manufacturing timepiece with solar battery - Google Patents

Abstract

To improve the shielding properties of a solar battery 30 while securing the power generation amount in the solar battery 30.SOLUTION: A timepiece 1 with a solar battery includes: a dial 14 including at least a polarizing plate 142 through which a light component polarized in a specific direction transmits, and a phase difference plate 141 which is provided on the opposite side of the polarizing plate 142 from the visual recognition side and imparts the phase difference to the transmitted light; and the solar battery 30 which generates electric power by incident light transmitted through the dial 14. The dial 14 has a shading structure 143 which is provided at a position closer to the visual recognition side than the polarizing plate 142 and includes a plurality of first shading parts 1431 which have a predetermined height and are separated from each other to extend in a direction intersecting with a transmission axis of the polarizing plate 142.SELECTED DRAWING: Figure 3

Description

The present invention relates to a clock with a solar cell and a method for manufacturing the clock with a solar cell.

In a clock with a solar cell, a dial having light transmission is used in order to allow light to enter the solar cell. The solar cell has a unique dark purple color and also has a dividing line that separates a plurality of cells. Therefore, if the solar cell can be seen through the dial, it may spoil the aesthetic appearance. Therefore, for example, Patent Document 1 discloses a technique of providing a polarizing plate and a retardation plate on a dial in order to shield a solar cell while ensuring light transmission. For example, Patent Document 2 discloses a technique of providing a light-shielding plate on a dial so that brightness and color can be adjusted according to a viewing angle.

Japanese Patent No. 4948730 Japanese Unexamined Patent Publication No. 50-93460

Here, in the dial disclosed in Patent Document 1, the solar cell is easily visually recognized depending on the direction in which the dial is visually recognized due to the characteristics of the polarizing plate and the retardation plate.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the shielding property of the solar cell while securing the amount of power generation in the solar cell.

The invention disclosed in the present application in order to solve the above problems has various aspects, and the outline of typical ones of these aspects is as follows.

(1) A character including at least a polarizing plate that transmits a light component polarized in a specific direction and a retardation plate that is provided on the opposite side of the polarizing plate on the viewing side and gives a phase difference to the transmitted light. It has a plate and a solar cell that generates light by injecting light transmitted through the dial. The dial is provided on the visual side of the polarizing plate, and is separated from each other to obtain the polarized light. A clock with a solar cell having a light-shielding structure including a plurality of first light-shielding portions having a predetermined height as well as extending in a direction intersecting the transmission axis of the plate.

(2) In (1), the retardation plate is a clock with a solar cell that gives a phase difference of π / 2 to light incident from a direction orthogonal to the retardation plate.

(3) In (1) or (2), the plurality of first light-shielding portions extend in a direction inclined by 45 ° with respect to the transmission axis of the polarizing plate.

(4) In any one of (1) to (3), the plurality of first light-shielding portions extend from the 3 o'clock side to the 9 o'clock side, a clock with a solar cell.

(5) In any of (1) to (4), the transmission axis of the polarizing plate extends from between the 6 o'clock side and the 9 o'clock side and between the 12 o'clock side and the 3 o'clock side. Clock with solar cell.

(6) In any of (1) to (5), a clock with a solar cell in which the phase advance axis of the retardation plate extends in a direction intersecting the transmission axis of the polarizing plate.

(7) In (6), the phase advance axis of the retardation plate extends in a direction inclined by 45 ° with respect to the transmission axis of the polarizing plate.

(8) In any of (1) to (7), the light-shielding structure includes a plurality of second light-shielding portions extending in a direction intersecting in a direction in which the first light-shielding portion extends. ..

(9) In (8), the second light-shielding portion is a clock with a solar cell extending in a direction orthogonal to the extending direction of the first light-shielding portion.

(10) In any of (1) to (9), the light-shielding structure is a clock with a solar cell including a light-transmitting plate and the first light-shielding portion provided on the light-transmitting plate.

(11) In any of (1) to (10), the light-shielding structure is provided in contact with the surface of the polarizing plate on the visual side, and is a clock with a solar cell.

(12) A step of preparing a light-transmitting plate, a step of providing a first light-shielding portion on the light-transmitting plate, a polarizing plate that transmits a light component polarized in a specific direction, and a polarizing plate on the visual side of the polarizing plate. A step of providing a retardation plate, which is provided on the opposite side and gives a retardation to the transmitted light, on the opposite side of the light-transmitting plate on the visible side, and a solar cell on the opposite side of the retardation plate on the visible side. A method for manufacturing a clock with a solar cell, which comprises a step of arranging the first light-shielding portion and a step of providing the first light-shielding portion, wherein the first light-shielding portion is formed by applying a curable resin.

According to the aspects (1) to (12) of the present invention, it is possible to improve the shielding property of the solar cell while securing the amount of power generation in the solar cell.

It is a top view which shows the clock with a solar cell which concerns on this embodiment. It is sectional drawing in the AA cutting line of FIG. It is sectional drawing which shows the outline of the dial and the solar cell of this embodiment. It is a top view which shows typically the orientation of arrangement of a retardation plate and a polarizing plate in this embodiment. It is a graph which shows the intensity of the light reflected by the reflector when the light is incident from the direction inclined with respect to a polarizing plate. It is a top view which shows the light-shielding structure in this embodiment. It is sectional drawing which shows the outline of the dial and the solar cell in the 1st modification of this embodiment. It is a top view which shows the light-shielding structure in the 2nd modification.

Hereinafter, embodiments of the present invention (hereinafter referred to as the present embodiment) will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing a clock with a solar cell according to the present embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. In FIG. 2, the crown 13 described later is not shown, and the minute hand 16 faces the 9 o'clock side and the hour hand 15 and the second hand 17 face the 3 o'clock side in order to make the arrangement of the pointer easy to understand. It shows the state of facing.

FIG. 1 shows a body 10 which is an exterior case (clock case) of a watch 1 with a solar cell, a dial 14 arranged inside the body 10, an hour hand 15 and a minute hand 16 and a second hand 17 which are pointers indicating the time. ing. Further, the dial 14 is provided with an hour character 49 at a predetermined position. Further, a band fixing portion 11 for fixing the band extends from the side surfaces of the body 10 on the 12 o'clock side and the 6 o'clock side. Further, a button 12 and a crown 13 for the user to perform various operations are arranged on the side surface of the body 10 on the 3 o'clock side.

The design of the clock shown in FIG. 1 is an example. In addition to the ones shown here, for example, the body 10 may be square instead of round, and the presence / absence, number, and arrangement of the buttons 12 and crown 13 are arbitrary. Further, in the present embodiment, the pointer has three pointers, the hour hand 15, the minute hand 16, and the second hand 17, but the present invention is not limited to this, and the second hand 17 may be omitted, or the presence or absence of the day of the week, the time zone, and the daylight saving time. , Radio wave reception status, battery level, guidelines for various displays, date display, etc. may be added.

In the present specification, as the clock 1 with a solar cell, the satellite signal is received from a satellite such as a GPS (Global Positioning System) satellite that transmits a satellite signal including information on the date and time, and the date and time included in the satellite signal are received. Indicates a satellite radio wristwatch that has the function of correcting the internal time held inside the watch based on the information about. However, the present invention is not limited to this, and a radio-controlled clock that receives a general standard radio wave and corrects the internal time may be used, or a clock that does not have such a time correction function may be used.

As shown in FIG. 2, the clock 1 with a solar cell has a windshield 32 formed of a transparent material such as glass so as to cover the dial 14, and the windshield 32 is attached to the body 10. Further, on the opposite side of the windshield 32, the back cover 36 is attached to the body 10.

Hereinafter, in the present specification, the front side of the paper surface in FIG. 1 (upper side in FIGS. 2 and 3) is referred to as the visual viewing side, and the back side of the paper surface in FIG. 1 (lower side in FIGS. 2 and 3) is referred to as the opposite side of the visual viewing side. .. Further, the surface on the visible side of each member is referred to as a visible surface, and the surface on the opposite side of the visible side is referred to as a back surface.

A solar cell 30 is arranged on the opposite side of the dial 14 on the visible side. The solar cell 30 generates electricity by light incident through the dial 14. Therefore, the dial 14 is made of a material that transmits light to some extent.

In the present embodiment, as shown by the broken line in FIG. 1, the solar cell 30 has a substantially circular shape, and is cut out in a fan shape from the 10 o'clock direction to the 2 o'clock direction. Then, on the opposite side of the dial 14 on the visual side, a patch antenna 20 for receiving a satellite signal is arranged in this notched portion (region where the solar cell 30 does not exist). By arranging the patch antenna 20 so as not to overlap the solar cell 30 in a plan view in this way, it is possible to suppress the influence of the electrodes included in the solar cell 30 on the reception sensitivity of the patch antenna 20. An antenna such as a patch antenna 20 is unnecessary for a timepiece that does not have a function of receiving radio waves. In that case, the solar cell 30 does not need to have a fan-shaped notch, and it is preferable that the solar cell 30 has a circular planar shape.

As shown in FIG. 2, the clock 1 with a solar cell further has a movement 38 provided on the opposite side of the solar cell 30 on the visual side. The movement 38 is an integral assembly of a train wheel and a motor for driving a pointer, a clock circuit including a crystal oscillator for measuring time, a controller for controlling the entire clock 1 with a solar cell, and the like in a frame called a main plate. is there. The movement 38 operates by obtaining electric power from a storage battery attached to the movement 38. The storage battery supplies electric power to the movement 38 and at the same time stores electric power generated by the solar cell 30, and is, for example, a button-type lithium secondary battery.

In the present embodiment, the solar cell 30 is integrally provided with the movement 38. Further, the movement 38 is provided with a pointer shaft protruding from the upper surface of the dial 14, and a second hand 17, a minute hand 16, and an hour hand 15 are attached to the tips thereof. Then, the windshield 32 is fixed to the body 10 so as to cover them.

Next, with reference to FIG. 3, the details of the configuration of the dial 14 of the present embodiment will be described. FIG. 3 is a cross-sectional view showing an outline of the dial and the solar cell of the present embodiment. Further, in FIG. 3, the light incident on the dial 14 is schematically shown by using arrows. Further, in FIG. 3, the left side in the figure is the 6 o'clock side, and the right side in the figure is the 12 o'clock side.

The dial 14 includes a retardation plate 141, a polarizing plate 142 provided on the viewing side of the retardation plate 141, and a light-shielding structure 143 provided on the viewing side of the polarizing plate 142. In the present embodiment, an example in which the visible surface of the retardation plate 141 is attached to the back surface of the polarizing plate 142 and the light-shielding structure 143 is attached to the visible surface of the polarizing plate 142 will be described.

The retardation plate 141 is a plate having a function of giving a phase difference to the incident light. In the present embodiment, as the retardation plate 141, a plate having a function of giving a phase difference of π / 2 (λ / 4) to incident light incident from a direction orthogonal to the retardation plate 141 is adopted.

The polarizing plate 142 is a linear polarizing plate that transmits only light polarized in a specific direction. In the present embodiment, the polarizing plate 142 transmits only linear polarization that vibrates in the x-axis direction that is orthogonal to the traveling direction, and linearly polarized light that vibrates in the y-axis direction that is orthogonal to the traveling direction and the x-axis direction. An example of absorption will be described.

In the present embodiment, the retardation plate 141 and the polarizing plate 142 are provided so as to overlap each other, and thus function as a so-called circular polarizing plate.

The light-shielding structure 143 includes a plurality of first light-shielding portions 1431 and a plurality of light-transmitting portions 1432. The plurality of first light-shielding portions 1431 and the plurality of translucent portions 1432 are alternately arranged.

The plurality of first light-shielding portions 1431 are provided apart from each other and have a predetermined height. The predetermined height corresponds to the length of the dial 14 in the thickness direction. By adjusting the height of the first light-shielding portion 1431, the thickness of the entire dial 14 may be adjusted to about 0.5 mm.

Similarly, the plurality of translucent portions 1432 are provided apart from each other and have a predetermined height. The light-transmitting portion 1432 is preferably made of a material having a higher light-transmitting property than the first light-shielding portion 1431.

Note that FIG. 3 shows an example in which the ratio occupied by the first light-shielding portion 1431 and the ratio occupied by the light-transmitting portion 1432 in the light-shielding structure 143 are substantially the same, but the present invention is not limited to this. By increasing the proportion occupied by the first light-shielding portion 1431, the shielding property of the solar cell 30 can be improved, while by increasing the proportion occupied by the translucent portion 1432, the transparency is improved. The amount of power generated by the solar cell 30 can be improved.

Here, with reference to FIG. 3, the light L1 incident from the direction orthogonal to the dial 14 will be described. The light L1 incident on the translucent portion 1432 included in the light-shielding structure 143 passes through the translucent portion 1432 and is incident on the visible surface of the polarizing plate 142.

A part of the light L1 incident on the polarizing plate 142 is reflected. Of the light not reflected by the polarizing plate 142, the linearly polarized light that oscillates in the y-axis direction is absorbed by the polarizing plate 142. On the other hand, of the light not reflected by the polarizing plate 142, the linearly polarized light vibrating in the x-axis direction passes through the polarizing plate 142. The linearly polarized light that vibrates in the x-axis direction that has passed through the polarizing plate 142 is incident on the visual plane of the retardation plate 141.

The light L11 incident on the visual plane of the retardation plate 141 passes through the retardation plate 141 and is given a phase difference of π / 2 (λ / 4). As a result, the light transmitted through the retardation plate 141 becomes circularly polarized light. In the present embodiment, it is assumed that the light transmitted through the retardation plate 141 is clockwise circularly polarized light. The clockwise circularly polarized light L12 that has passed through the retardation plate 141 passes through the air layer and is incident on the solar cell 30.

A part of the light L13 incident on the solar cell 30 is absorbed by the solar cell 30 and contributes to power generation, and the other part (light L14) is reflected on the surface of the solar cell 30. The clockwise circularly polarized light incident on the solar cell 30 is reflected on the surface of the solar cell 30 to become counterclockwise circularly polarized light.

The counterclockwise circularly polarized light reflected on the front surface of the solar cell 30 passes through the air layer and is incident on the back surface of the retardation plate 141. The light L14 incident on the retardation plate 141 passes through the retardation plate 141 and is given a phase difference of π / 2 (λ / 4) to become linearly polarized light that oscillates in the y-axis direction.

Further, the linearly polarized light L15 transmitted through the retardation plate 141 is incident on the back surface of the polarizing plate 142. Since the polarizing plate 142 absorbs linearly polarized light vibrating in the y-axis direction, the linearly polarized light L15 transmitted through the retardation plate 141 and incident on the back surface of the polarizing plate 142 is absorbed by the polarizing plate 142. That is, the light reflected on the surface of the solar cell 30 does not leak to the outside of the dial 14. Therefore, the user does not visually recognize the solar cell 30. This is an example of the case where light is incident from a direction orthogonal to the dial 14, and this is not the case with light incident from a direction inclined with respect to the surface of the dial 14. The thickness (optical path length) of the retardation plate 141 is set so as to give a phase difference of π / 2 (λ / 4) when light is incident on the retardation plate 141 from a direction orthogonal to the retardation plate 141. Because.

The light incident from the direction inclined with respect to the retardation plate 141 has a longer optical path length when passing through the retardation plate 141 than the light incident from the direction orthogonal to the retardation plate 141. Therefore, a phase difference larger than π / 2 (λ / 4) is given to the light incident on the retardation plate 141 from the direction of inclination.

Therefore, the light transmitted through the polarizing plate 142 and the retardation plate 141 is not right-handed circularly polarized light but right-handed elliptically polarized light, and the light reflected by the solar cell 30 is not left-handed circularly polarized light but left-handed elliptically polarized light. turn into. Elliptical polarized light is polarized light in which the light component in one direction is larger than that in the other direction than the circularly polarized light. The light component in one direction is not absorbed by the polarizing plate 142, passes through the polarizing plate 142, and leaks to the outside of the dial 14.

Therefore, the user who sees the dial 14 from an oblique direction instead of from the front direction may visually recognize the solar cell 30. The solar cell 30 has a unique dark purple color and also has a dividing line that separates solar cells. When such a solar cell 30 is visually recognized from the outside, the aesthetic appearance is deteriorated. Hereinafter, the properties of the retardation plate 141 and the polarizing plate 142 will be described in more detail with reference to FIGS. 4 and 5.

FIG. 4 is a plan view schematically showing the arrangement of the retardation plate and the polarizing plate in the present embodiment. Note that FIG. 4 shows the azimuth angle θ with respect to the transmission axis (also referred to as the polarization axis) of the polarizing plate 142 in a plan view. The azimuth angle θ is an angle with respect to the extending direction of the transmission axis of the polarizing plate 142 regardless of whether it is clockwise or counterclockwise.

As shown in FIG. 4, in the present embodiment, the polarizing plate 142 and the retardation plate are arranged so that the phase advance axis of the retardation plate 141 is inclined by 45 ° with respect to the transmission axis of the polarizing plate 142. It was provided so as to overlap with 141. With such a configuration, as described above, the function as a circularly polarizing plate is exhibited.

FIG. 5 is a graph showing the intensity of the emitted light reflected by the reflector and emitted to the outside when the light is incident from the direction of inclination with respect to the polarizing plate, which was performed by the inventor of the present application. The simulation results are shown. In this simulation, the retardation plate 141 and the plate corresponding to the polarizing plate 142 in the present embodiment are provided on top of each other, and the reflector is arranged on the opposite side of the viewing side. The reflector is arranged in place of the solar cell 30 of the present embodiment.

It can be said that FIG. 5 is a graph showing the intensity of the light leaked to the outside when the light is incident on the polarizing plate from the direction of inclination. The greater the intensity of the light leaked to the outside, the easier it is for the member provided on the opposite side of the retardation plate to be visually recognized from the outside. The vertical axis of FIG. 5 shows the intensity of the light leaked to the outside. The horizontal axis of FIG. 5 indicates the emission angle φ of the emitted light reflected by the reflector and emitted to the outside. It is assumed that the incident angle of the incident light applied to the polarizing plate and the emitted angle of the emitted light reflected by the reflector and emitted to the outside are equal and both are φ.

In this simulation, visible light having an azimuth θ of 0 °, 45 °, 90 °, or 135 ° with respect to the transmission axis of the polarizing plate in a plan view and a wavelength of 550 nm from the direction inclined with respect to the polarizing plate is emitted. The intensity of the light leaked to the outside when irradiated was measured.

Regardless of the incident angle φ of the incident light applied to the polarizing plate, the intensity of the light leaked to the outside when the light is irradiated from the direction in which the azimuth angle θ with respect to the transmission axis of the polarizing plate is 45 °. It tends to be strong. That is, as shown in FIG. 5, when light is irradiated from a direction in which the azimuth angle θ with respect to the transmission axis of the polarizing plate is 45 °, the emitted light having an emission angle φ that is reflected by the reflector and emitted to the outside is emitted. It tends to be strong. Further, even when light is irradiated from a direction in which the azimuth angle θ with respect to the transmission axis of the polarizing plate is 135 °, the intensity of the light leaked to the outside tends to be strong.

As described above, the emitted light reflected by the reflector and emitted to the outside from the direction in which the azimuth angle with respect to the transmission axis of the polarizing plate is 45 ° or 135 ° tends to leak to the outside. That is, when the dial 14 is viewed from the direction in which the azimuth angle of the polarizing plate with respect to the transmission axis is 45 ° or 135 °, the reflected light reflected by the solar cell 30 easily leaks to the outside of the dial, and the solar cell 30 It can be said that the shielding property of is low. Although not shown, even when irradiated with light having wavelengths of 450 nm and 650 nm, the cases of θ = 45 ° and 135 ° are better than those of θ = 0 ° and 90 °. Intense light was measured.

That is, when the arrangement shown in FIG. 4 is adopted, the solar cell 30 can be easily seen through when the dial 14 is viewed from the 12 o'clock side, the 6 o'clock side, the 3 o'clock side, and the 9 o'clock side.

Therefore, in the present embodiment, by providing the light-shielding structure 143, the solar cell 30 is difficult to see through when the dial 14 is viewed from the 12 o'clock side and the 6 o'clock side. Specifically, a light-shielding structure 143 including a plurality of first light-shielding portions 1431 extending in a direction inclined by 45 ° with respect to the transmission axis of the polarizing plate 142 is provided.

The details of the configuration of the light-shielding structure 143 will be described with reference to FIGS. 3, 4, and 6. FIG. 6 is a plan view showing a light-shielding structure according to the present embodiment.

The light-shielding structure 143 is provided on the visual side of the polarizing plate 142. Further, the light-shielding structure 143 includes a plurality of first light-shielding portions 1431.

Further, in the present embodiment, the polarizing plate 142 is provided so that its transmission axis extends in a direction rotated 45 ° clockwise with respect to the 12 o'clock side. That is, the transmission axis of the polarizing plate 142 extends from between the 6 o'clock side and the 9 o'clock side and between the 12 o'clock side and the 3 o'clock side.

Then, in the present embodiment, the first light-shielding portion 1431 is provided so as to extend from the 3 o'clock side to the 9 o'clock side. That is, the first light-shielding portion 1431 is provided so as to extend in the direction in which the transmission axis of the polarizing plate 142 is rotated by 45 ° with respect to the extending direction (see FIGS. 4 and 6).

As shown in FIG. 3, the light L2 (incident angle φ) incident from the 12 o'clock side and from the direction inclined with respect to the dial 14 is incident on the first light-shielding portion 1431. This is because the first light-shielding portion 1431 has a predetermined height. Since the light L2 is incident on the first light-shielding portion 1431 having low light transmission, it is difficult to reach the solar cell 30. That is, when the light is incident from the 12 o'clock side in the direction of inclination with respect to the dial 14, the intensity of the light reflected by the solar cell 30 becomes small. That is, the intensity of the emitted light having an emission angle φ that is reflected by the solar cell 30 and emitted to the outside is small, and when the user looks at the dial 14 from the 6 o'clock side, it becomes difficult to visually recognize the solar cell 30. The same applies when the dial 14 is visually recognized from the 12 o'clock side.

In the present embodiment, the light incident from the 6 o'clock side or the 12 o'clock side is difficult to reach the solar cell 30, while the light incident from the 3 o'clock side or the 9 o'clock side is transparent in the light shielding structure 143. It easily penetrates the light unit 1432 and is easily incident on the solar cell 30. Therefore, in the dial 14 of the present embodiment, the shielding property of the solar cell 30 when viewed from the 6 o'clock side and the 12 o'clock side can be improved, and the power generation amount of the solar cell 30 can be secured.

Further, in the dial 14 of the present embodiment, by providing the light-shielding structure 143, the dial 14 can be made to a desired thickness, the strength is improved, and the occurrence of warpage, distortion, etc. is suppressed. Can be done.

It is preferable that the hour letter 49 shown in FIG. 1 is provided on the visible surface of the light-shielding structure 143. Before the light-shielding structure 143 is provided on the visible surface of the polarizing plate 142, the hour character 49 may be provided on the visible surface of the light-shielding structure 143. As a result, the light-shielding structure 143 can be positioned with respect to the polarizing plate 142 using the hour letter 49 as a mark. Therefore, in the manufacturing process, the orientation of the light-shielding structure 143 in the circumferential direction (the positional relationship between the direction in which the first light-shielding portion 1431 extends and the direction in which the transmission axis of the polarizing plate 142 extends) is not mistaken.

The relationship between the arrangement of the retardation plate 141, the polarizing plate 142, and the light-shielding structure 143 in the circumferential direction is not limited to that shown in FIGS. 4 and 6, and the extending direction of the first light-shielding portion 1431 is not limited to that shown in FIGS. , The direction may be such that it intersects the transmission axis of the polarizing plate 142. That is, the extending direction of the first light-shielding portion 1431 is not limited to the one that is inclined by 45 ° with respect to the transmission axis of the polarizing plate 142, and may not be at least parallel to the transmission axis of the polarizing plate 142.

Further, as described above, when the retardation plate 141 and the polarizing plate 142 are arranged as shown in FIG. 4, the dial 14 is viewed from the 12 o'clock side, the 6 o'clock side, the 3 o'clock side, and the 9 o'clock side. In addition, the solar cell 30 is easy to see through. Therefore, the light-shielding structure 143 may be provided so that the first light-shielding portion 1431 extends in the direction extending from the 12 o'clock side to the 6 o'clock side.

Further, for example, when the direction in which the transmission axis of the polarizing plate 142 extends is from the 9 o'clock side to the 3 o'clock side, the direction in which the first light-shielding portion 1431 extends is from between the 12 o'clock side and the 9 o'clock side to the 3 o'clock side. It is recommended that the direction extends between the 6 o'clock side.

Further, the first light-shielding portion 1431 is not limited to the one provided in a striped shape as shown in FIG. 6, and may be provided in a circular shape, for example. That is, the first light-shielding portion 1431 may be provided so that at least a part thereof intersects the transmission axis of the polarizing plate 142.

Next, a first modification of the present embodiment will be described with reference to FIG. 7. FIG. 7 is a cross-sectional view showing an outline of the dial and the solar cell in the first modification of the present embodiment.

In the first modification, the light-shielding structure 143 includes a light-transmitting plate 1433 and a first light-shielding portion 1431. The light-shielding portion 1431 is the same as that shown in FIGS. 3 and 6. The translucent plate 1433 is attached to the visible surface of the polarizing plate 142. Further, the first light-shielding portion 1431 is provided on the visible surface of the light-transmitting plate 1433. Further, the plurality of first light-shielding portions 1431 are provided apart from each other, and there is a gap between the first light-shielding portions 1431. The first light-shielding portion 1431 may be made of, for example, a material containing a coloring pigment.

Note that FIG. 7 shows an example in which the first light-shielding portion 1431 is provided on the visible surface of the light-transmitting plate 1433, but the present invention is not limited to this, and the first light-shielding portion 1431 is provided on the back surface of the light-transmitting plate 1422. May be provided.

Next, an example of a method for manufacturing a timepiece with a solar cell according to the first modification of the present embodiment will be described. First, a first light-shielding portion 1431 is provided on the visible surface of the light-transmitting plate 1433. Further, the polarizing plate 142 and the retardation plate 141 provided on the side opposite to the viewing side of the polarizing plate 142 are provided on the opposite side of the translucent plate 1433 on the viewing side. More specifically, the visible surface of the retardation plate 141 is attached to the back surface of the polarizing plate 142, and the visible surface of the polarizing plate 142 is attached to the back surface of the translucent plate 1433. After that, the solar cell 30 is arranged on the opposite side of the retardation plate 141 on the visible side.

In the step of providing the first light-shielding portion 1431, first, the light-transmitting plate 1433 is prepared. Then, for example, it is preferable to provide the first light-shielding portion 1431 on the visible surface of the light-transmitting plate 1433 by using inkjet technology. Specifically, the curable resin constituting the first light-shielding portion 1431 may be discharged onto the visible surface of the light-transmitting plate 1433. By using the inkjet technique in this way, the pattern of the first light-shielding portion 1431 can be easily formed with high position accuracy.

A second modification of the present embodiment will be described with reference to FIG. FIG. 8 is a plan view showing a light-shielding structure in a second modification of the present embodiment. In the second modification, the configurations and arrangements of the retardation plate 141 and the polarizing plate 142 are the same as those shown in FIGS. 3 and 4.

In the second modification, the light-shielding structure 243 is configured to further include a second light-shielding portion 2431 on the visible surface side of the light-shielding structure 143 shown in FIGS. 3 and 6. As shown in FIG. 8, a plurality of second light-shielding portions 2431 are provided so as to extend from the 12 o'clock side to the 6 o'clock side so as to be separated from each other. That is, the second light-shielding portion 2431 is provided so as to extend in a direction orthogonal to the direction in which the first light-shielding portion 1431 extends.

Further, the second light-shielding structure 243 may include a plurality of light-transmitting parts 2432 that are provided between the plurality of second light-shielding parts 2431 and are separated from each other. The light-transmitting portion 2432 is preferably made of a material having a higher light-transmitting property than the second light-shielding portion 2431.

By providing the second light-shielding portion 2431, the user not only visually recognizes the dial 14 from the 6 o'clock side or the 12 o'clock side, but also when the user visually recognizes the dial 14 from the 3 o'clock side or the 9 o'clock side. However, it becomes difficult to visually recognize the solar cell 30.

In the second modification, the solar cell 30 is likely to be shielded from any direction as long as it is inclined with respect to the dial 14. That is, the deterioration of the aesthetics of the dial 14 is suppressed.

The direction in which the second light-shielding portion 2431 extends is not limited to the direction orthogonal to the direction in which the first light-shielding portion 1431 extends, and at least the direction in which the first light-shielding portion 1431 extends intersects the direction in which the first light-shielding portion 1431 extends. It would be nice to have it.

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 appropriately modify these disclosed embodiments, and it should be understood that the technical scope of the invention disclosed herein also includes such modifications.

1 Clock with solar cell, 10 barrels, 11 band fixing part, 12 buttons, 13 crown, 14 dial, 141 retardation plate, 142 polarizing plate, 143, 243 light-shielding structure, 1431 first light-shielding part, 1432 translucent Part, 1433 light-transmitting plate, second light-shielding part 2431, 2432 light-transmitting part, 15-hour hand, 16-minute hand, 17-second hand, 20 patch antenna, 30 solar cells, 32 windshield, 36 back cover, 38 movement, 49 o'clock character.

Claims (12)

A dial including at least a polarizing plate that transmits a light component polarized in a specific direction and a retardation plate that is provided on the opposite side of the polarizing plate on the viewing side and gives a phase difference to the transmitted light.
A solar cell that generates electricity when light transmitted through the dial is incident on it,
Have,
The dial is provided on the visual side of the polarizing plate, and includes a plurality of first light-shielding portions that are separated from each other and extend in a direction intersecting the transmission axis of the polarizing plate and have a predetermined height. Has a light-shielding structure,
Clock with solar cell. The retardation plate imparts a phase difference of π / 2 to light incident from a direction orthogonal to the retardation plate.
The clock with a solar cell according to claim 1. The plurality of first light-shielding portions extend in a direction inclined by 45 ° with respect to the transmission axis of the polarizing plate.
The clock with a solar cell according to claim 1 or 2. The plurality of first light-shielding portions extend from the 3 o'clock side to the 9 o'clock side.
The clock with a solar cell according to any one of claims 1 to 3. The transmission axis of the polarizing plate extends from between the 6 o'clock side and the 9 o'clock side and between the 12 o'clock side and the 3 o'clock side.
The clock with a solar cell according to any one of claims 1 to 4. The phase advance axis of the retardation plate extends in a direction intersecting the transmission axis of the polarizing plate.
The clock with a solar cell according to any one of claims 1 to 5. The phase advance axis of the retardation plate extends in a direction inclined by 45 ° with respect to the transmission axis of the polarizing plate.
The clock with a solar cell according to claim 6. The light-shielding structure includes a plurality of second light-shielding portions extending in a direction intersecting the direction in which the first light-shielding portion extends.
The clock with a solar cell according to any one of claims 1 to 7. The second light-shielding portion extends in a direction orthogonal to the direction in which the first light-shielding portion extends.
The clock with a solar cell according to claim 8. The light-shielding structure includes a light-transmitting plate and the first light-shielding portion provided on the light-transmitting plate.
The clock with a solar cell according to any one of claims 1 to 9. The light-shielding structure is provided in contact with the surface of the polarizing plate on the visible side.
The clock with a solar cell according to any one of claims 1 to 10. The process of preparing the translucent plate and
The step of providing the first light-shielding portion on the light-transmitting plate and
A polarizing plate that transmits a light component polarized in a specific direction and a retardation plate that is provided on the opposite side of the polarizing plate on the viewing side and gives a phase difference to the transmitted light can be visually recognized by the light transmitting plate. The process to be provided on the opposite side of the side and
The process of arranging the solar cell on the opposite side of the retardation plate on the visible side, and
Have,
In the step of providing the first light-shielding portion, the first light-shielding portion is formed by applying a curable resin.
How to make a watch with a solar cell.

Images