JP6445307B2 - Timepiece with solar cell and method for hiding deformation marks - Google Patents

Description

  The present invention relates to a timepiece with a solar cell and a method for hiding deformation marks.

  The dial of the timepiece with solar cell is formed of a light-transmitting material so as to transmit light necessary for power generation of the solar cell. In addition, in order to give the dial a metallic luster and improve the appearance, there are cases where a material that transmits light and reflects light is adopted as the material and structure of the dial.

  In Patent Document 1 below, a display plate in which a concavo-convex pattern is formed on the surface on the viewing side of the first transmissive reflector, and a diffusion layer is provided on the surface facing the solar cell of the second transmissive reflector. Is described.

JP 2010-276456 A

  In the display plate described in Patent Document 1, by providing a diffusion layer on either of the front and back sides of the transmissive reflector, the solar cell cannot be seen while transmitting light necessary for power generation of the solar cell. A display board with is obtained. However, the timepiece dial with solar cell needs to be diversified in design, and it is necessary to use a transflective plate with various reflectivities, but it has a thickness suitable for the timepiece dial with solar cell. The board has limited options. If the light-transmitting reflector suitable for this condition is made of a thermoformable material, the light-transmitting reflector is softened when using a watch with a solar cell in a relatively high temperature environment. There is. When the light-transmitting reflector is softened, the surface shape of the solar cell is transferred to the light-transmitting reflector, and the light-transmitting reflector is deformed to form deformation marks, which may impair the appearance of the dial.

  An object of the present invention is to maintain the appearance of a dial in a timepiece with a solar cell including a light transmissive reflecting plate.

  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 solar cell and a thermoplastic resin which is disposed on the front side of the solar cell and has a heat-resistant temperature of 60 ° C. or less, a matte layer is integrally formed on the front side, and interference reflection is caused by multilayer lamination. a light transmissive reflection plate having a metallic luster by, disposed on the front side of the light transmissive reflector, with solar cell and a light transmissive substrate Ru separate Dare and the light transmissive reflection plate clock.

  (2) In (1), the matte layer is formed of a material obtained by mixing a light transmissive medium with a diffusing agent, and a weight ratio of the diffusing agent to the light transmissive medium is 8% or more. Clock with.

  (3) The timepiece with a solar cell according to (1) or (2), further comprising a light-transmitting colored layer between the light-transmitting reflecting plate and the matte layer.

  (4) The timepiece with a solar cell according to any one of (1) to (3), wherein the solar cell and the light transmissive reflecting plate are fixed in a pressed state.

(5) A dial plate comprising a solar cell and a light-transmitting reflecting plate that is disposed on the front side of the solar cell and is formed of a thermoplastic resin having a heat-resistant temperature of 60 ° C. or less, the front side of the solar cell This is a method of hiding the deformation marks formed on the light-transmitting reflector by the protrusions formed on the surface of the metal, by forming a matte layer integrally on the front side and causing interference reflection by multilayer lamination. The light-transmitting reflecting plate having a gloss is arranged , and a light-transmitting substrate that is a separate body from the light-transmitting reflecting plate is placed on the front side of the light-transmitting reflecting plate, and the deformation trace is hidden. Method.

  According to the above aspect (1) of the present invention, when a deformation mark is formed on a light-transmitting reflector that can be thermoformed at a relatively low temperature such as the heat-resistant temperature required for a wristwatch and is easily deformed by heat. Even so, it is possible to obtain a watch with a solar battery that maintains the beauty of the dial.

  Moreover, according to the side surface of the said (2) of this invention, even if it is a case where the dotted | punctate deformation trace of the magnitude | size which can be visually recognized is formed in a light transmissive reflecting plate, with a solar cell with which a deformation trace is hard to visually recognize A clock is obtained.

  Moreover, according to the side surface of the said (3) of this invention, the timepiece with a solar cell from which the dotted deformation trace of a light transmissive reflecting plate is hard to visually recognize is obtained.

  In addition, according to the above aspect (4) of the present invention, the solar cell and the light-transmitting substrate can be reliably fixed, and even when placed in a high-temperature environment, dot-like deformation marks are visually recognized. A hard watch with a solar battery is obtained.

  Further, according to the above aspect (5) of the present invention, deformation marks are formed on the light-transmitting reflecting plate that can be thermoformed at a relatively low temperature such as the heat-resistant temperature required for a wristwatch and is easily deformed by heat. Even if it is a case, the method of concealing a deformation | transformation trace is obtained so that the beauty | look of a dial may be maintained.

It is a top view which shows the timepiece with a solar cell which concerns on embodiment of this invention. It is sectional drawing of a timepiece with a solar cell. It is an enlarged view of a section of a timepiece with a solar cell. It is a figure explaining reflection of the light by a mat layer. It is a figure explaining reflection of the light in a comparative example. It is an enlarged view of a section of a timepiece with a solar cell according to a modification. It is a top view which shows the inner frame which accommodated the solar cell. It is a top view which shows the light transmissive reflecting plate fitted by the inner frame.

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

  FIG. 1 is a plan view showing a wristwatch 1 with a solar cell according to an embodiment of the present invention. FIG. 1 shows a bezel 2a, a dial ring 2b, a dial plate 3, a time character 5, a date window 6, a pointer 7, and a crown 8. 2 is a cross-sectional view of the solar cell timepiece 1 taken along the line II-II in FIG. FIG. 2 shows a dial 3 composed of a bezel 2a, a dial ring 2b, a time character 5, a windshield 9, a trunk 10, a back cover 11, a movement 12, a light transmissive substrate 20 and a light transmissive reflector 21, a sun A battery 30 is shown.

  The design of the solar cell timepiece 1 shown in FIG. 1 is merely an example. In addition to those shown here, for example, the outer shape of the dial 3 and the solar cell timepiece 1 may be a square shape instead of a round shape, or an index for displaying the second may be attached to the dial ring 2b. Good. Further, the facing ring 2b may be omitted. In the present embodiment, the hands 7 are the hour hand and the minute hand. However, the second hand may be added, and the date is displayed on the date window 6, but not limited thereto, the day of the week is displayed. Also good. Moreover, it is good also as providing the auxiliary | assistant pointer | guide which performs the presence or absence of a time zone or daylight saving time, the battery remaining amount, and various displays. In that case, the user may be able to perform various operations by providing a button in addition to the crown 8 on the outside of the bezel 2a.

  A windshield 9 made of a transparent material such as glass is attached to the bezel 2 a so as to cover the dial 3 in the solar cell timepiece 1. In addition, the dial 3, the solar cell 30, and the movement 12 are accommodated in the exterior part in which the body 10, the bezel 2a, the turn ring 2b, and the windshield 9 are integrated, and the back side is closed by the back cover 11. ing. In this specification, the side (upper side in FIG. 2) on which the windshield 9 of the solar cell timepiece 1 is arranged is the front side, the side on which the back cover 11 is arranged (lower side in FIG. 2) is the back side, and the front side. The surfaces corresponding to the back side and the back side are referred to as a front side surface and a back side surface, respectively.

  A solar cell 30 is disposed on the back side of the dial 3 and power is generated by light incident from the front side. Therefore, the light-transmitting substrate 20 and the light-transmitting reflecting plate 21 constituting the dial plate 3 are formed of a material that transmits light to some extent. Moreover, the light transmissive reflecting plate 21 is formed of a thermoplastic resin and has a relatively high light reflectance of 30% to 70%, and preferably has a metallic luster. Any material having such characteristics may be used as the material for forming the light transmissive reflecting plate 21. As a preferred example, interference reflection is performed by multilayer lamination of PET (polyethylene terephthalate). Mention may be made of the resulting film. Such a light transmissive reflecting plate 21 improves the aesthetic appearance of the dial plate 3 with gloss similar to metal while allowing light to pass through the solar cell 30 arranged on the back side. Such a light transmissive reflector 21 may have a relatively low heat-resistant temperature due to its material or structure. For example, as the light transmissive reflector 21, a Picasas (registered trademark) manufactured by Toray Industries, Inc. is used. In this case, the heat resistant temperature is 60 ° C. In addition, the heat-resistant temperature of the light transmissive reflecting plate 21 may be indicated as a material characteristic, or may be indicated as a lower limit value of the applicable temperature of the hot press.

  FIG. 3 is an enlarged view of a cross section of the solar cell timepiece 1 according to the present embodiment, and is an enlarged view of the enlarged region 50 shown in FIG. The light-transmitting substrate 20 in which the time character 5 is arranged on the front side surface has a smooth surface on the back side. On the back side of the light transmissive substrate 20, a light transmissive reflecting plate 21 is disposed. A matte layer 22 is formed on the front side of the light transmissive reflector 21. In the present embodiment, the matte layer 22 is made of a material in which a transparent agent, which is a light-transmitting medium, is mixed with a diffusing agent that irregularly reflects light, and is printed on the front surface of the light-transmitting reflector 21. . In the present embodiment, the weight ratio between the transparent ink and the diffusing agent is 10%. However, the weight ratio between the transparent ink and the diffusing agent may be 10% or less. However, as will be described later, in order to make it difficult to visually recognize the deformation marks formed on the light transmissive reflecting plate 21, the weight ratio of the transparent ink to the diffusing agent is desirably 8% or more. A solar cell 30 is disposed on the back side of the light transmissive reflecting plate 21. In addition, it is good also as forming a concentric pattern, a radial pattern, etc. by making the surface on the front side or the back side of the light transmissive substrate 20 into an uneven surface.

  In the solar cell timepiece 1 according to this embodiment, the light transmissive substrate 20 has a thickness of 400 μm to 500 μm, and the light transmissive reflector 21 has a thickness of 100 μm. If the light transmissive reflecting plate 21 having this thickness is used as a standard in a watch manufactured in the past, it is not necessary to change the design of members other than the dial 3 by selecting the same thickness. The benefits are great. For example, the aforementioned Picasas (registered trademark) is suitable as the light transmissive reflector 21 having a thickness of 100 μm and a selectable reflectance type. However, the optimal thickness of the light-transmitting reflecting plate 21 constituting the dial plate 3 is not limited to 100 μm, and the light-transmitting reflecting plate 21 having a thickness other than 100 μm is typically used in a watch manufactured in the past. If so, its thickness is optimal.

  The solar cell 30 may have minute irregularities on the surface. For example, in the case of an amorphous silicon solar cell, when an amorphous silicon thin film is formed by plasma CVD (Chemical Vapor Deposition) or a transparent electrode such as ITO (Indium Tin Oxide) is formed, sputter traces with a diameter of several hundreds μm are formed on the surface. May be formed. If there are sputter marks on the surface of the solar cell 30, the light-transmitting reflection softened when placed near the heat-resistant temperature of the solar cell timepiece 1 or higher, for example, in the dashboard of an automobile. In some cases, the sputtering marks of the solar cell 30 may be transferred to the plate 21. When the sputter marks are transferred to the light transmissive reflector 21, even if the solar cell timepiece 1 is cooled again, the dot-shaped deformation marks having the same size as the transferred sputter marks are transferred to the light transmissive reflector 21. The appearance of the dial 3 may be impaired. It should be noted that the shape of the deformation trace remaining on the light transmissive reflector 21 varies depending on the shape of the sputtering trace of the solar cell 30 and is not necessarily a dot shape, but may be a linear shape or the like.

  FIG. 4 is a diagram for explaining the reflection of light by the matte layer 22. In some cases, the light-transmissive reflecting plate 21 to which the spatter marks of the solar cell 30 are transferred is formed by protruding the point-shaped deformation marks 21a in a convex shape on the surface on the front side. When the matte layer 22 is not provided on the front side surface of the light transmissive reflector 21, when the spot-like deformation mark 21a is formed, the light-transmissive reflector 21 is formed at the point-like deformation mark 21a and other parts. The incident light is reflected in different ways, and the spot-like deformation mark 21a is visually recognized. The solar cell timepiece 1 according to the present embodiment has a matte layer 22 on the front surface of the light transmissive reflecting plate 21, and even if the spot-like deformation marks 21 a are formed on the light transmissive reflecting plate 21, Since the light is diffused by the matte layer 22, it becomes difficult to visually recognize the dot-shaped deformation marks, and the aesthetic appearance of the dial 3 is maintained. The matte layer 22 has a weight ratio of the diffusing agent 22a to the light transmissive medium of 10%, and is a point of the light transmissive reflector 21 formed by a visible sputter mark (a sputter mark having a diameter larger than about 100 μm). There is a sufficient light diffusion effect to make it difficult to visually recognize the deformation marks.

  In FIG. 4, the reflected light is shown about the 1st incident light 60 which injects into the dotted deformation trace 21a part, and the 2nd incident light 61 which injects into the part in which the dotted deformation trace 21a is not formed, respectively. Yes. The first incident light 60 is reflected and diffused by the diffusing agent 22a included in the matte layer 22, and the first reflected light 60a and the second reflected light 60b are generated. In addition, the second incident light 61 is also reflected and diffused by the diffusing agent 22a included in the matte layer 22, and third reflected light 61a and fourth reflected light 61b are generated. The first to fourth reflected lights are diffused under the same conditions by the diffusing agent 22a in the vicinity of the surface of the spot-like deformation mark 21a and in the vicinity of the surface of the other part, so the dial 3 is observed. The person cannot determine which of the first to fourth reflected lights is the light reflected from the point-like deformation mark 21a portion, and therefore, it becomes difficult to visually recognize the point-like deformation mark 21a.

  The diameter of the spot-like deformation mark 21a that can be visually recognized is about 100 μm. In the first place, it is difficult to visually recognize the spot-like deformation mark 21a having a diameter of around 100 μm or smaller than this. According to the experiment of the inventor of the present invention, a point-shaped deformation mark having a diameter larger than 100 μm is visually recognized when the weight ratio of the diffusing agent 22a to the light transmissive medium is 6%, and the diffusing agent 22a to the light transmissive medium. As a result, the weight ratio of 8% was almost invisible, and when the weight ratio of the diffusing agent 22a to the light transmitting medium was 10%, it was not visually recognized. As a result of this experiment, the inventors of the present invention have found that it is difficult to visually recognize the spot-like deformation marks 21a of the light-transmitting reflector 21 formed by sputter marks having a diameter larger than 100 μm. The weight ratio of the diffusing agent 22a to the light transmissive medium constituting the mat layer 22 may be 8% or more. Therefore, in the timepiece 1 with a solar cell according to the present embodiment, the dotted deformation marks 21a formed on the light transmissive reflecting plate 21 are not easily recognized regardless of the size, and the aesthetic appearance of the dial 3 is maintained. It becomes.

  FIG. 5 is a diagram for explaining light reflection in a comparative example. In the comparative example, the matte layer 22 is formed on the back surface of the light transmissive substrate 20. Other configurations of the solar cell timepiece according to the comparative example are the same as those of the solar cell timepiece 1 according to the present embodiment. In FIG. 5, the reflected light is shown about the 1st incident light 60 which injects into the dotted deformation trace 21a part, and the 2nd incident light 61 which injects into the part in which the dotted deformation trace 21a is not formed, respectively. Yes.

  The first incident light 60 is reflected and diffused by the diffusing agent 22a included in the matte layer 22, and a fifth reflected light 60c and a sixth reflected light 60d are generated. Further, the second incident light 61 is also reflected and diffused by the diffusing agent 22a included in the matte layer 22, and the seventh reflected light 61c and the eighth reflected light 61d are generated. Here, like the sixth reflected light 60d and the eighth reflected light 61d, the light incident on the point-like deformation mark 21a and the light incident on the part where the point-like deformation mark 21a is not formed are: It may be reflected under the same conditions. However, the fifth reflected light 60c and the seventh reflected light 61c are reflected and viewed under different conditions. The fifth reflected light 60 c is reflected by the surface of the spot-like deformation mark 21 a formed on the back side of the matte layer 22. On the other hand, the seventh reflected light 61c is reflected on the surface of the light-transmissive reflecting plate 21 where the point-like deformation marks 21a are not formed. Therefore, the fifth reflected light 60c and the seventh reflected light 61c have different conditions for the reflecting surface, the optical path length of the light, the length of the optical path passing through the air, and the like. For this reason, the way of reflecting incident light is different between the point-like deformation mark 21a and other portions. The light reflected by the point-like deformation mark 21a is reflected in a direction corresponding to the shape of each part of the point-like deformation mark 21a, and the reflected light reflects the shape of the point-like deformation mark 21a. When the light reflecting the shape of the spot-like deformation mark 21a passes through the matte layer 22 again, the light reflecting the shape of the point-like deformation mark 21a is reflected unless the diffusion effect of the matte layer 22 is large. Only by being reduced, this state is maintained and visually recognized as the shape of the spot-like deformation mark 21. However, if the weight ratio of the diffusing agent 22a is very large, it is difficult to visually recognize the spot-like deformation marks 21a even in the comparative example. However, when the weight ratio of the diffusing agent 22a is very large, the matte layer 22 is excessively cloudy, and the metal feeling of the light transmissive reflecting plate 21 is impaired, or the power generation amount of the solar cell 30 is sufficiently reduced. It may not be possible to obtain a sufficient amount of power generation. If the mat layer 22 is formed on the front surface of the light transmissive reflector 21 as in the present embodiment, the spot-like deformation marks 21a can be visually recognized even when the weight ratio of the diffusing agent 22a is relatively small. It can be difficult. Therefore, according to the solar cell timepiece 1 according to the present embodiment, the gloss of the light transmissive reflector 21 is not excessively fogged by the mat layer 22, and the solar cell 30 is excessively clouded by the mat layer 22. Thus, it is possible to make it difficult to visually recognize the point-like deformation mark 21a.

  Moreover, as a matter of course, even if the mat layer 22 is formed on the back surface of the light transmissive reflector 21, the effect of making it difficult to visually recognize the spot-like deformation marks 21a cannot be obtained. This is because the matte layer 22 disposed on the back side is difficult to visually recognize through the matte layer 22, whereas the matte layer 22 disposed on the front side is not glossy. It is because it will visually recognize without going through the eraser layer 22. Therefore, the matte layer 22 needs to be formed on the surface on the front side of the light-transmitting reflector 21 as in this embodiment.

  In addition, when forming a pattern by making the surface of the light-transmitting substrate 20 or the surface of the back side into an uneven surface, the pattern formed on the light-transmitting substrate 20 in addition to the light being diffused by the matte layer 22 As a result, it becomes more difficult to visually recognize the dot-shaped deformation marks of the light transmissive reflecting plate 21.

  FIG. 6 is an enlarged view of a cross section of the solar cell timepiece 1 according to a modification of the present embodiment. The difference between the solar cell timepiece 1 according to the modification and the solar cell timepiece shown in FIG. 3 is that light for decorating the dial 3 between the light-transmitting reflector 21 and the matte layer 22. It is a point further provided with a transparent colored layer 23. In the solar cell timepiece 1 according to the modification, in addition to the light being diffused by the matte layer 22 formed on the front side of the light transmissive reflector 21, the light transmissive reflector 21 and the matte layer 22 The light-transmitting colored layer 23 formed therebetween prevents light of a specific wavelength from being transmitted, and the spot-shaped deformation marks on the light-transmitting reflecting plate 21 are further difficult to visually recognize.

  The light transmissive colored layer 23 may be formed on the back side surface of the light transmissive substrate 20. That is, the matte layer 22 formed on the front side of the light transmissive reflecting plate 21 and the light transmissive colored layer 23 formed on the back side of the light transmissive substrate 20 may be in contact with each other. Even in that case, not only the dial 3 is decorated, but also the light is diffused by the matte layer 22, and the light-transmitting colored layer 23 prevents the transmission of light of a specific wavelength. It becomes difficult to visually recognize the dot-shaped deformation mark of the reflecting plate 21.

  Further, the light transmissive colored layer 23 may be formed on the front side of the light transmissive substrate 20. Even in that case, not only the dial 3 is decorated, but also the light is diffused by the matte layer 22, and the light-transmitting colored layer 23 prevents the transmission of light of a specific wavelength. It becomes difficult to visually recognize the dot-shaped deformation mark of the reflecting plate 21. Alternatively, a concentric pattern or a radial pattern may be formed by forming a light-transmitting colored layer 23 on the front side of the light-transmitting substrate 20 and forming an uneven surface on the back side of the light-transmitting substrate 20. Good. When a pattern is formed on the back side of the light-transmitting substrate 20, the dot-shaped deformation marks formed on the light-transmissive reflecting plate 21 overlap with the patterns, so that the dot-shaped deformation marks are more difficult to visually recognize. Of course, it is good also as employ | adopting the structure which combined said structure.

  Note that the matte layer 22 may diffuse light due to surface irregularities in addition to diffusing light with a diffusing agent. When the light-transmitting colored layer 23 or the like for decoration is printed on the surface of the matte layer 22, the unevenness formed on the surface of the matte layer 22 is filled and smoothed, and the effect of diffusing light is obtained. In some cases, the dot-shaped deformation marks formed on the light-transmissive reflecting plate 21 may be easily visually recognized. When this adversely affects the appearance and transmittance of the dial plate 3, the light-transmitting colored layer 23 is formed on the front side or the back side of the light-transmitting substrate 20 or between the light-transmitting reflecting plate 21 and the matte layer 22. It is good to form.

  FIG. 7 is a plan view showing the middle frame 40 in which the solar cells 30 are housed. The middle frame 40 is a case for accommodating the movement 12 and the like inside. The solar cell 30 is arranged so as to overlap the front side of the movement 12. The solar cell 30 is positioned and arranged by aligning the notch formed on the periphery of the solar cell 30 with the notch formed on the periphery of the middle frame 40. The middle frame 40 includes a first fitting part 41 and a second fitting part 42. The first fitting portion 41 and the second fitting portion 42 are members for aligning the light transmissive reflecting plate 21 and overlapping the light transmissive substrate 20 that are arranged on the front side of the solar cell 30. .

  FIG. 8 is a plan view showing the light transmissive reflecting plate 21 arranged in the middle frame 40. The light transmissive reflecting plate 21 is aligned by the first fitting portion 41 and the second fitting portion 42 of the middle frame 40. The light transmissive substrate 20 is held without dropping from the middle frame 40 by fixing the light transmissive substrate 20 to the first fitting portion 41 and the second fitting portion 42 by fitting. At this time, the light transmissive reflecting plate 21 and the solar cell 30 are in contact with each other and fixed in a pressed state. This is one of the factors that cause the sputter marks of the solar cell 30 to be transferred to the light transmissive reflector 21. In addition, the fixing structure of the solar cell 30 and the light transmissive reflecting plate 21 shown in FIGS. 7 and 8 is an example. In order to prevent the members constituting the dial 3 from moving without being limited to such a structure, it is necessary to fix the light transmissive reflecting plate 21 in a pressed state against the solar cell 30.

  Whether or not the sputter traces of the solar cell 30 are transferred to the light transmissive reflecting plate 21 can be determined by the following method. First, a solar cell 30 that may have a sputter mark is prepared. In order to reproduce the conditions under which the solar cell timepiece is used as a product, it is desirable to prepare the solar cell 30 in a state of being disposed in the middle frame 40.

  Next, the light transmissive reflecting plate 21 and the light transmissive substrate 20 are disposed on the front side of the solar cell 30. When the solar cell 30 is disposed in the middle frame 40, the light transmissive reflecting plate 21 is fitted into the first fitting portion 41 and the second fitting portion 42 of the middle frame 40, and the light transmissive substrate 20 is It is desirable to fit and fix these fitting parts.

  Thereafter, the solar cell 30, the light transmissive reflector 21, and the light transmissive substrate 20 are heated to a predetermined temperature that is a heat-resistant temperature required for the solar cell timepiece 1, for example, 60 ° C. When the light transmissive reflecting plate 21 is softened by heating, the sputter marks of the solar cell 30 may be transferred to the light transmissive reflecting plate 21.

  Finally, the front side surface, the inside, and the back side surface of the light transmissive reflecting plate 21 are observed. Thereby, it is inspected whether or not deformation traces such as dot-like deformation traces are formed on the light transmissive reflecting plate 21.

  Even when deformation marks such as dot-shaped deformation marks are observed on the light-transmissive reflecting plate 21, it is possible to design a watch with a solar cell in which the deformation marks are difficult to be visually recognized by the following method. First, the size of what can be visually recognized among the deformation | transformation traces observed in the light transmissive reflecting plate 21 is measured.

  Next, the weight ratio of the diffusing agent to the light-transmitting medium is set for the matte layer formed on the front side of the light-transmitting reflecting plate 21 based on the measurement result of the size of the deformation trace that can be visually recognized. The lower limit value of the weight ratio of the diffusing agent to the light-transmitting medium is determined so that deformation marks of all sizes are difficult to be visually recognized. The weight ratio of the diffusing agent to the light-transmitting medium may be determined by adjusting the dial plate 3 so that a desired glossiness is obtained while exceeding the lower limit.

  In the timepiece 1 with a solar cell according to the present embodiment, deformation marks such as dotted deformation marks are formed on the light transmissive reflector 21 by protrusions such as sputter marks formed on the front surface of the solar cell 30. There is a case. Even in such a case, a method in which the light-transmitting reflecting plate 21 having the matte layer 22 formed on the front side is placed on the back side of the light-transmitting substrate 20 and fixed integrally is applied to the dial 3. Can hide the deformation marks. Since the matte layer 22 formed on the front side of the light transmissive reflecting plate 21 reflects light incident on any place under the same conditions, deformation marks formed on the light transmissive reflecting plate 21 are not deformed. Difficult to see. The light transmissive substrate 20 is fixed by pressing the light transmissive reflecting plate 21. Therefore, it is necessary to use a material that does not deform at least at 60 ° C. as the material of the light transmissive substrate 20 so that the similar deformation marks are not formed on the light transmissive substrate 20 due to the deformation marks formed on the light transmissive reflector 21. There is. Here, since the light transmissive reflecting plate 21 may be formed using a material that is deformed at 60 ° C. or lower, in other words, the light transmissive substrate 20 is a material having a higher heat resistance temperature than the light transmissive reflecting plate 21. It is formed using.

  1 watch with solar cell, 2a bezel, 2b turn ring, 3 dial, 5 hour, 6 daylight, 7 pointer, 8 crown, 9 windshield, 10 trunk, 11 back cover, 12 movement, 20 light transmitting substrate, 21 Light-transmissive reflector, 21a Dot-shaped deformation mark, 22 Matte layer, 22a Diffusing agent, 23 Light-transmissive colored layer, 30 Solar cell, 40 Middle frame, 41 First fitting portion, 42 Second fitting portion , 50 enlarged region, 60 first incident light, 60a first reflected light, 60b second reflected light, 60c fifth reflected light, 60d sixth reflected light, 61 second incident light, 61a third Reflected light, 61b fourth reflected light, 61c seventh reflected light, 61d eighth reflected light.

Claims (5)

Solar cells,
Arranged on the front side of the solar cell, formed of a thermoplastic resin having a heat-resistant temperature of 60 ° C. or less, a matte layer is integrally formed on the front side, and has a metallic luster by causing interference reflection by multilayer lamination. A light transmissive reflector,
Disposed on the front side of the light transmissive reflection plate, a light transmissive substrate Ru separate Dare and the light transmissive reflection plate,
A watch with solar cells. The timepiece with a solar cell according to claim 1, wherein the matte layer is formed of a material obtained by mixing a light transmissive medium with a diffusing agent, and a weight ratio of the diffusing agent to the light transmissive medium is 8% or more. . The timepiece with solar cell according to claim 1, further comprising a light-transmitting colored layer between the light-transmitting reflector and the matte layer. The timepiece with a solar cell according to any one of claims 1 to 3, wherein the solar cell and the light-transmissive reflecting plate are fixed while being pressed against each other. In a dial plate comprising a solar cell and a light transmissive reflecting plate that is arranged on the front side of the solar cell and is formed of a thermoplastic resin having a heat resistant temperature of 60 ° C. or less,
A method of concealing deformation marks formed on the light transmissive reflector plate by protrusions formed on the front surface of the solar cell,
Formed integrally with matte layer on the front side, and placing the light transmissive reflection plate having a metallic luster by causing interference reflector by a multilayer laminate,
A light transmissive substrate that is a separate body from the light transmissive reflector is disposed on the front side of the light transmissive reflector .
How to hide deformation marks.

Images