JP5208017B2 - Electronic watch with solar cell - Google Patents
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- JP5208017B2 JP5208017B2 JP2009038031A JP2009038031A JP5208017B2 JP 5208017 B2 JP5208017 B2 JP 5208017B2 JP 2009038031 A JP2009038031 A JP 2009038031A JP 2009038031 A JP2009038031 A JP 2009038031A JP 5208017 B2 JP5208017 B2 JP 5208017B2
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- 238000010248 power generation Methods 0.000 claims description 329
- 210000004027 cell Anatomy 0.000 description 133
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000011218 segmentation Effects 0.000 description 3
- 230000032823 cell division Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Description
この発明は、光を利用して発電するソーラーセルを文字板に対し、略垂直に配置したソーラーセル付電子時計の構造に関するものである。 The present invention relates to a structure of an electronic timepiece with a solar cell in which solar cells that generate light using light are arranged substantially perpendicular to a dial.
従来からソーラーセルを有し、太陽光などの光を発電電源として利用する電子時計が実用化されている。そのほとんどは、光透過性のある風防ガラス等の風防部材と時計ケースの内部に、前記風防部材と平行に配置された光透過性のある文字板と、前記文字板の前記風防部材とは反対の面側にソーラーセルを配置している。そして、前記風防部材と前記文字板を透過してきた光がソーラーセルに達することでソーラーセルが発電し、その電力を使用して時計を駆動している。この方法によると、光を透過する文字板が必須となり、光の透過具合によっては、下面のソーラーセルの色が透けて見えることもあり、デザイン性を損なっていた。また、時計に良く使用している光を透過しない金属板製の文字板を使用できないなど、デザイン上の制約が大きかった。 Conventionally, an electronic timepiece having a solar cell and using light such as sunlight as a power generation power source has been put into practical use. Most of them are light-transmitting windshield members such as windshield glass and a light-transmitting dial disposed in parallel with the windshield member inside the watch case, and the windshield member of the dial is opposite to the windshield member. A solar cell is placed on the side of the surface. And when the light which permeate | transmitted the said windshield member and the said dial plate reaches | attains a solar cell, a solar cell produces electric power, and the timepiece is driven using the electric power. According to this method, a dial plate that transmits light is indispensable, and depending on how light is transmitted, the color of the solar cell on the lower surface may be seen through, which impairs design. In addition, design restrictions such as the use of a dial made of a metal plate that does not transmit light, which is often used for watches, were severe.
そこで、ソーラーセルを文字板の下に配置するのではなく、特許文献１や特許文献２のように、風防部材と文字板の間に配置し、文字板を取り囲むように文字板に対し略垂直に配置する構造が提案されている。図８は特許文献１の図１に示された電子時計（電子時計の要部断面図）である。図８において、１０２は風防部材、１０５は文字板、１０７はソーラーセル、１００は時計ケース、１０３は裏蓋である。また１０６は光透過性の部材である見返しリング、１０４は時計ムーブメント、１０４ａは、時計ムーブメント１０４の構成部品であり、ソーラーセル１０７等を支持するソーラーセル保持部である。このように、風防部材１０２と見返しリング１０６を透過した光を、文字板１０５の周囲に配置したソーラーセル１０７が受光して発電する構造とすることにより、文字板１０５として、従来の金属文字板の使用が可能となり、文字板下面側にソーラーセルを配置するソーラーセル付電子時計のように、ソーラーセルの色が透けて見えることもなく、文字板のデザインの制約を解消したソーラーセル付電子時計を実現している。 Therefore, the solar cell is not arranged under the dial, but is arranged between the windshield member and the dial as in Patent Document 1 and Patent Document 2, and is arranged substantially perpendicular to the dial so as to surround the dial. A structure has been proposed. FIG. 8 is an electronic timepiece (partial cross-sectional view of an electronic timepiece) shown in FIG. In FIG. 8, 102 is a windshield member, 105 is a dial, 107 is a solar cell, 100 is a watch case, and 103 is a back cover. Reference numeral 106 denotes a turn ring which is a light transmissive member, 104 denotes a timepiece movement, 104a denotes a component of the timepiece movement 104, and a solar cell holding portion which supports the solar cell 107 and the like. In this manner, the solar cell 107 disposed around the dial plate 105 receives the light transmitted through the windshield member 102 and the dial ring 106 and generates power, so that a conventional metal dial plate is used as the dial plate 105. As with an electronic watch with a solar cell in which a solar cell is placed on the lower side of the dial, the color of the solar cell does not show through and the electronic with solar cell eliminates the restrictions on the design of the dial. Realize the clock.
また、特許文献１、特許文献２に記載の実施例に示されるような単一のソーラーセルで構成した場合、発電される電圧が小さく、ソーラーセルで発電した電流を充電用電池に充電するに必要な電圧を確保するのが困難となる場合があり、その場合昇圧充電回路により電圧を昇圧して充電用電池に充電する方法や、特許文献３にあるようなソーラーセルを多段化して、直列接続することで充電用電池に充電する電圧を確保する方法などがある。 Moreover, when comprised with the single solar cell as shown in the Example as described in patent document 1 and patent document 2, the voltage generated is small, and the charging battery is charged with the current generated by the solar cell. In some cases, it may be difficult to secure a necessary voltage. In such a case, a voltage is boosted by a boosting charging circuit to charge a charging battery, or a solar cell as described in Patent Document 3 is multistaged and connected in series. There is a method of securing a voltage for charging a charging battery by connecting.
また、ソーラーセルの受光領域に入光する光は風防部材と文字板の間に均等に入光するわけではなく、風防部材側の入光照度が低い場合や文字板側の入光照度が低い場合などがあり、特許文献３のように、各々の発電領域の面積が均等となるようにソーラーセルを分割した場合、各々の発電領域に入光する光の単位面積あたりの平均照度に差が発生し、各々の発電領域における発電量は、その平均照度の差に応じて差が生じることになる。それらの発電量に差がある発電領域同士を直列に接続し使用する場合、最も発電量が小さい領域の発電量に制限されることが一般に知られており、入光する光の単位面積あたりの平均照度の高い領域、つまり多くの発電が可能な領域においてはその発電能力を十分に発揮できない非効率的な多段ソーラーセル構成となってしまう。それらを改善するため、特許文献４にみられるように分割線を櫛歯状にすることにより、各々の発電領域に入光する光の単位面積あたりの平均照度の差が低減され、それぞれのソーラーセルが同等な発電量を得ることができる。
しかしながら、特許文献４のように分割線を櫛歯状にしたソーラーセルは、分割線が複雑
となり、ソーラーセルを文字板をとりかこむように曲げて配置する構造においては櫛歯状の分割線の部分に応力が集中して、クラック等の破壊が起きる可能性がある。
In addition, the light entering the light receiving area of the solar cell is not evenly incident between the windshield member and the dial, and there are cases where the incident illuminance on the windshield member side is low or the incident illuminance on the dial side is low. As in Patent Document 3, when the solar cells are divided so that the areas of the respective power generation regions are equal, a difference occurs in the average illuminance per unit area of light entering each power generation region, The amount of power generation in the power generation region differs depending on the difference in average illuminance. It is generally known that when power generation regions with different power generation amounts are connected in series and used, the power generation amount is limited to the region with the smallest power generation amount. In an area where the average illuminance is high, that is, an area where a large amount of power can be generated, an inefficient multi-stage solar cell configuration in which the power generation capability cannot be sufficiently exhibited. In order to improve them, as shown in Patent Document 4, the dividing lines are comb-like, so that the difference in average illuminance per unit area of light entering each power generation region is reduced. The cell can obtain the same amount of power generation.
However, in the solar cell in which the dividing line is comb-like as in Patent Document 4, the dividing line is complicated, and in the structure in which the solar cell is bent so as to sandwich the dial plate, the comb-like dividing line portion There is a possibility that stress concentrates on the surface and breaks such as cracks occur.
以上説明したように、充電用電池に充電するに必要な発電電圧を確保するためにソーラーセルを複数の発電領域に分割して直列接続した場合、各発電領域の照度差に起因して各発電領域に発電量の差が生じ、ソーラーセルの発電効率が低下するという問題があり、これに対する有効な解決策は存在しなかった。
本発明は、ソーラーセルを文字板に対し略垂直に配置し、ソーラーセルの発電領域が、文字板側に形成された発電領域と風防部材側に形成された発電領域とを含む複数の発電領域に分割されたソーラーセル付電子時計において、ソーラーセルの各発電領域の発電量の差を低減することを目的とする。
As described above, when a solar cell is divided into a plurality of power generation regions and connected in series in order to secure the power generation voltage necessary for charging the charging battery, each power generation is caused by the difference in illuminance in each power generation region. There is a problem that a difference in power generation amount occurs in the region and the power generation efficiency of the solar cell is lowered, and there is no effective solution for this.
The present invention provides a plurality of power generation regions in which a solar cell is disposed substantially perpendicular to a dial plate, and a power generation region of the solar cell includes a power generation region formed on a dial plate side and a power generation region formed on a windshield member side In the electronic timepiece with a solar cell divided into two, the object is to reduce the difference in the amount of power generation in each power generation region of the solar cell.
上記課題を解決するため、本発明では、文字板と、該文字板の上部に配置される光透過性の風防部材と、光を受光して起電力を発生する発電領域が形成されたソーラーセルと、を有し、前記発電領域が、前記文字板と前記風防部材との間に位置するように、前記文字板に対して前記ソーラーセルが略垂直に配置され、前記発電領域が、前記文字板側に形成された発電領域と、該文字板側に形成された発電領域よりも前記風防部材側に形成された発電領域とを含む複数の発電領域に分割された電子時計において、前記風防部材から入射する無指向性の光による単位面積あたりの平均照度が他の発電領域よりも低い発電領域の面積を、前記他の発電領域の面積よりも大きくなるように、前記複数の発電領域における各発電領域の面積を設定したことを特徴とする。 In order to solve the above problems, in the present invention, a solar cell in which a dial plate, a light-transmissive windshield member disposed on the dial plate, and a power generation region that receives light to generate an electromotive force are formed. And the solar cell is disposed substantially perpendicular to the dial so that the power generation region is located between the dial and the windshield member, and the power generation region is the character In the electronic timepiece divided into a plurality of power generation areas including a power generation area formed on the plate side and a power generation area formed on the windshield member side than the power generation area formed on the dial side, the windshield member Each of the power generation regions in the plurality of power generation regions has an average illuminance per unit area lower than that of the other power generation regions, and larger than the area of the other power generation regions. Set the area of the power generation area. The features.
また、前記複数の発電領域が、前記文字板側に形成された第１発電領域と、該第１発電領域と前記第２発電領域との間に形成された第３発電領域の３つの発電領域から成り、前記、第１発電領域および前記第２発電領域よりも前記第３発電領域の方が前記単位面積あたりの平均照度が高くなっており、前記第１発電領域および前記第２発電領域の面積が前記第３発電領域の面積よりも大きくなるように前記第１発電領域から前記第３発電領域の面積を設定したことを特徴とする。 In addition, the plurality of power generation areas include a first power generation area formed on the dial side and a third power generation area formed between the first power generation area and the second power generation area. The third power generation region has higher average illuminance per unit area than the first power generation region and the second power generation region, and the first power generation region and the second power generation region The area of the third power generation region is set from the first power generation region so that the area is larger than the area of the third power generation region.
また、前記第１発電領域よりも前記第２発電領域のほうが前記単位面積あたりの平均照度が高くなっており、前記第１発電領域の面積を、前記第２発電領域の面積よりも大きくしたことを特徴とする。 The second power generation region has a higher average illuminance per unit area than the first power generation region, and the area of the first power generation region is larger than the area of the second power generation region. It is characterized by.
また、前記第２発電領域よりも前記第１発電領域の方が前記単位面積あたりの平均照度が高くなっており、前記第２発電領域の面積を、前記第１発電領域の面積よりも大きくしたことを特徴とする。 The first power generation region has a higher average illuminance per unit area than the second power generation region, and the area of the second power generation region is larger than the area of the first power generation region. It is characterized by that.
また、前記複数の発電領域が、前記文字板側に形成された第１発電領域と、該第１発電領域よりも前記風防部材側に形成された第２発電領域の２つの発電領域から成り、前記第１の発電領域よりも前記第２発電領域の方が前記単位面積あたりの平均照度が高くなっており、前記第１発電領域の面積を、前記第２発電領域の面積よりも大きくしたことを特徴とする。 In addition, the plurality of power generation regions are composed of two power generation regions, a first power generation region formed on the dial plate side and a second power generation region formed on the windshield member side than the first power generation region, The second power generation region has a higher average illuminance per unit area than the first power generation region, and the area of the first power generation region is larger than the area of the second power generation region. It is characterized by.
また、前記複数の発電領域が、前記文字板側に形成された第１発電領域と、該第１発電領域よりも前記風防部材側に形成された第２発電領域の２つの発電領域から成り、前記第２発電領域よりも前記第１発電領域の方が前記単位面積あたりの平均照度が高くなっており、前記第２発電領域の面積を、前記第１発電領域の面積よりも大きくしたことを特徴とする。 In addition, the plurality of power generation regions are composed of two power generation regions, a first power generation region formed on the dial plate side and a second power generation region formed on the windshield member side than the first power generation region, The first power generation region has a higher average illuminance per unit area than the second power generation region, and the area of the second power generation region is larger than the area of the first power generation region. Features.
また、前記複数の発電領域に分割するための分割線が直線状であることを特徴とする。 Further, the dividing line for dividing the plurality of power generation regions is linear.
また、前記無指向性の光による各発電領域の発電量が等しく成るように、前記各発電領域の面積を設定したことを特徴とする。 In addition, the area of each power generation region is set so that the amount of power generation in each power generation region by the non-directional light is equal.
本発明によれば、簡潔な分割方法で、それぞれの発電領域の発電量の差を低減するような分割が可能となる。 According to the present invention, it is possible to divide by a simple dividing method so as to reduce the difference in the amount of power generation in each power generation region.
以下に添付図面を参照して、この発明にかかるソーラーセル付電子時計の好適な実施の形態を詳細に説明する。 Exemplary embodiments of an electronic timepiece with solar cell according to the present invention will be explained below in detail with reference to the accompanying drawings.
図１は本発明の第１の実施形態にかかるソーラーセル配置構造を示すソーラーセル付電子時計の要部断面図であり、図２は本発明の第１の実施の形態にかかるソーラーセルの斜視図であり、図３は本発明の第１の実施の形態にかかるソーラーセル搭載時のソーラーセルと時計ケースとの関係を示す時計ケースの背面図であり、図４は本発明の第１の実施の形態にかかる２分割されたソーラーセルの平置き状態を示す図であり、図５は本発明の第１の実施の形態にかかるソーラーセルに入光する光の分布と各ソーラーセル発電領域の分割位置における単位面積あたりの平均照度を示した図である。図６は本発明の第２の実施の形態にかかる３分割されたソーラーセルの平面状態を示す図である。図７は本発明の第２の実施の形態にかかるソーラーセルに入光する光の分布と各ソーラーセル発電領域の分割位置における単位面積あたりの平均照度を示した図である。 FIG. 1 is a cross-sectional view of an essential part of an electronic timepiece with a solar cell showing a solar cell arrangement structure according to a first embodiment of the present invention, and FIG. 2 is a perspective view of the solar cell according to the first embodiment of the present invention. FIG. 3 is a rear view of the watch case showing the relationship between the solar cell and the watch case when the solar cell according to the first embodiment of the present invention is mounted, and FIG. 4 is the first view of the present invention. FIG. 5 is a diagram showing a flat state of the solar cell divided into two according to the embodiment, and FIG. 5 shows the distribution of light incident on the solar cell according to the first embodiment of the present invention and each solar cell power generation region. It is the figure which showed the average illumination intensity per unit area in each division position. FIG. 6 is a diagram showing a planar state of a three-divided solar cell according to the second embodiment of the present invention. FIG. 7 is a diagram showing the distribution of light entering the solar cell according to the second embodiment of the present invention and the average illuminance per unit area at each solar cell power generation region division position.
図１において、ソーラーセル付電子時計は、時刻表示部（図示しない）を有する時計ムー
ブメント４と、前記時計ムーブメント４に取り付けられ、時刻を判別するための切り分や装飾を施した文字板５と、前記時計ムーブメント４および、前記文字板５を収納し、前記時計ムーブメント４の時刻表示部を時計の外部から視認するための第１の開口部１ｂを有する時計ケース１と、前記時計ケース１の第１の開口部１ｂに配置され、時計表示部の保護を行う光透過性の風防部材２と、前記時計ケース１の内部に収容され、前記風防部材２と前記文字板５の間に、前記文字板５に対し略垂直に配置されたソーラーセル７と、前記時計ケース１の内部に収容され、前記風防部材２と前記文字板５の間に配置され光透過性部材で形成された見返しリング６と、前記時計ケース１と嵌合し、前記時計ケース１の第１の開口部１ｂと反対側の第２の開口部１ｃ、側を密封するための裏蓋３とを備えている。
In FIG. 1, an electronic timepiece with a solar cell includes a timepiece movement 4 having a time display unit (not shown), and a dial 5 attached to the timepiece movement 4 and provided with a cut and decoration for determining time. A timepiece case 1 that houses the timepiece movement 4 and the dial 5 and has a first opening 1b for visually recognizing the time display portion of the timepiece movement 4 from the outside of the timepiece; A light-transmitting windshield member 2 disposed in the first opening 1b and protecting the timepiece display portion, housed inside the timepiece case 1, and between the windshield member 2 and the dial 5 A solar cell 7 arranged substantially perpendicular to the dial plate 5 and a facing phosphorus housed in the watch case 1 and arranged between the windshield member 2 and the dial plate 5 and formed of a light transmissive member. 6, the fitted with watchcase 1, the second opening portion 1c of the side opposite to the first opening 1b of the watch case 1, and a back cover 3 for sealing the side.
風防部材２は、時計ケース１の第１の開口部１ｂの内側に設けられた段部１ａに載置して取り付けられている。またソーラーセル７は、文字板５の平面視で前記風防部材２の外周よりも外側であり、かつ文字板５の外周部よりも外側に配置されている。また、見返しリング６は、ソーラーセル７と同様に文字板５に対して略垂直に配置されるとともに、ソーラーセル７よりも内側に配置されている。 The windshield member 2 is mounted and mounted on a step portion 1 a provided inside the first opening 1 b of the watch case 1. Further, the solar cell 7 is arranged outside the outer periphery of the windshield member 2 in a plan view of the dial plate 5 and outside the outer peripheral portion of the dial plate 5. Similarly to the solar cell 7, the turn ring 6 is disposed substantially perpendicular to the dial 5 and is disposed on the inner side of the solar cell 7.
前記時計ムーブメント４は時刻表示が可能な、例えば、液晶セルや、指針等の時刻表示部（図示しない）を備え、また前記ソーラーセル７と接続して、前記ソーラーセル７により発電された起電力を蓄電する蓄電装置（図示しない）を備え、前記時刻表示部は前記蓄電装置に蓄えられた電力により駆動し、時刻を表示する。 The timepiece movement 4 can display time, for example, includes a time display unit (not shown) such as a liquid crystal cell or hands, and is connected to the solar cell 7 to generate an electromotive force generated by the solar cell 7. The time display unit is driven by the electric power stored in the power storage device and displays the time.
前記ソーラーセル７は、図２に示すように、前記風防部材２を透過した光を受光して起電力を発生するソーラーセル発電部７ａと、前記ソーラーセル発電部７ａの前記風防部材２側および前記時計ムーブメント４側の端部に構成され、前記ソーラーセル発電部７ａを湿度温度等の外乱から保護するためのソーラーセル非発電部７ｂ、７ｃを有している。ここで前記ソーラーセル非発電部７ｂ、７ｃは光を受光しても発電をしない。また図４に示すように、前記ソーラーセル発電部７ａは直線状の分割領域７ｄにより、文字板５に近い側に配置される第１発電領域７ｍと、風防部材２に近い側に配置される第２発電領域７ｎに分割される。ここで、前記第１発電領域７ｍと第２発電領域７ｎは直列接続されている。また前記ソーラーセル発電部７ａで発生した電力を前記時計ムーブメント４内に搭載された蓄電装置（図示しない）に蓄電するため、前記ソーラーセル７は、前記蓄電装置と接続するためのソーラーセル端子８を備えている。 As shown in FIG. 2, the solar cell 7 receives a light transmitted through the windshield member 2 to generate an electromotive force, a solar cell power generation section 7a on the windshield member 2 side, The solar cell power generation unit 7a is configured at the end of the timepiece movement 4 and has solar cell non-power generation units 7b and 7c for protecting the solar cell power generation unit 7a from disturbances such as humidity and temperature. Here, the solar cell non-power generation units 7b and 7c do not generate power even when receiving light. As shown in FIG. 4, the solar cell power generation unit 7 a is disposed on the side near the windshield member 2 and the first power generation region 7 m disposed on the side close to the dial 5 by the linear divided region 7 d. It is divided into second power generation regions 7n. Here, the first power generation region 7m and the second power generation region 7n are connected in series. Further, in order to store the electric power generated in the solar cell power generation unit 7a in a power storage device (not shown) mounted in the timepiece movement 4, the solar cell 7 has a solar cell terminal 8 for connection to the power storage device. It has.
ここで前記ソーラーセル７は図４に示すように、通常直線状の平板形状に形成され、図２、図３のように所望の形に曲げながら、図１に示すように、時計ムーブメント４に形成されたソーラーセルの曲げ形状に応じた溝４ａに前記ソーラーセル非発電部７ｃを収めるように搭載する。尚、図３では、時計ケース１を背面側から見た場合の時計ケース１に対するソーラーセル７の収納位置及び収納形状を示しており、これら以外の部材を省略している。図３のように、ソーラーセル７は、時計ケース１内の時計ケース１の段部１ａよりも外側の位置に環状形状に曲げられた状態で収納されている。これにより、ソーラーセル非発電部７ｃは文字板５の表面（文字板５の風防部材２側の面）よりも、時計ムーブメント４側の光が照射されない部分に位置する。また、ソーラーセル７はその外側の面が文字板５に対して略垂直に形成されたソーラーセル保持部４ｂの内面に密着することにより、ソーラーセル保持部４ｂによってガイドされている。 Here, the solar cell 7 is usually formed in a straight flat plate shape as shown in FIG. 4, and is bent into a desired shape as shown in FIGS. 2 and 3, while being attached to the watch movement 4 as shown in FIG. It mounts so that the said solar cell non-electric power generation part 7c may be stored in the groove | channel 4a according to the bending shape of the formed solar cell. FIG. 3 shows the storage position and storage shape of the solar cell 7 with respect to the watch case 1 when the watch case 1 is viewed from the back side, and other members are omitted. As shown in FIG. 3, the solar cell 7 is housed in a state bent in an annular shape at a position outside the step portion 1 a of the watch case 1 in the watch case 1. Thereby, the solar cell non-power generation part 7c is located in a portion where the light on the timepiece movement 4 side is not irradiated with respect to the surface of the dial plate 5 (the surface on the windshield member 2 side of the dial plate 5). Further, the solar cell 7 is guided by the solar cell holding portion 4 b by bringing the outer surface thereof into close contact with the inner surface of the solar cell holding portion 4 b formed substantially perpendicular to the dial plate 5.
図５は図１に示す第１の実施形態において、風防部材２の上面より無指向性の光が照射されたとき、ソーラーセル発電部７ａに入光する光の単位面積あたりの照度分布をシミュレートした結果である。
無指向性の光でシミュレートしたのは、机等の平らな面に載置されたソーラーセル付電子
時計に対して、ソーラーセル付電子時計から十分離れた位置にある照明器具の光や太陽光が照射されるような、通常、ユーザーが使用するような充電方法を想定しているためである。このような条件では、風防部材２の上面からソーラーセル７側に入射する光は、無指向性の光となる。
FIG. 5 shows a simulation of the illuminance distribution per unit area of light entering the solar cell power generation unit 7a when omnidirectional light is irradiated from the top surface of the windshield member 2 in the first embodiment shown in FIG. This is the result.
Simulated with omnidirectional light, the light of the lighting fixtures and solar light that are sufficiently away from the electronic watch with solar cell, compared to the electronic watch with solar cell placed on a flat surface such as a desk. This is because a charging method that is normally used by a user, such as light irradiation, is assumed. Under such conditions, light incident on the solar cell 7 side from the upper surface of the windshield member 2 becomes non-directional light.
図５（ａ）は縦軸に時計ケース１内に配置されたソーラーセル７を風防部材２に近い側からの距離を単位面積ごとに区切ったソーラーセルの範囲を表し、横軸は縦軸で区切った各ソーラーセル範囲へ入光する光の単位面積あたりの平均照度をあらわしたものである。ここでソーラーセル範囲は、風防部材２側に配置されるソーラーセル端部から、文字板５方向への距離を表す数値であり、ソーラーセル範囲２００〜４００とは風防部材側に配置されるソーラーセル端面から２００μｍ下がった位置から４００μｍ下がった位置までの範囲のことである。図５（ｂ）は図５（ａ）のグラフで示された、単位面積ごとに区切ったソーラーセル範囲とその単位面積における平均照度を表にまとめ、後述する第１の実施の形態におけるソーラーセル分割方法を説明するものである。 FIG. 5A shows a solar cell range in which the vertical axis indicates the solar cell 7 arranged in the watch case 1 and the distance from the side close to the windshield member 2 is divided for each unit area, and the horizontal axis is the vertical axis. It shows the average illuminance per unit area of light entering each solar cell range. Here, the solar cell range is a numerical value representing the distance in the direction of the dial plate 5 from the end of the solar cell arranged on the windshield member 2 side, and the solar cell range 200 to 400 is solar arranged on the windshield member side. This is the range from the position 200 μm down from the cell end face to the position 400 μm down. FIG. 5 (b) summarizes the solar cell range divided by unit area and the average illuminance in the unit area shown in the graph of FIG. 5 (a) in a table, and the solar cell in the first embodiment described later. A division method will be described.
図１に示す第１の実施の形態においては、図５（ａ）に示すようにソーラーセル発電部７ａに入光する光は、文字板５側、風防部材２側に近い範囲では入光量が少なく、文字板５側、風防部材２側の中間地点よりやや文字板５側に近い位置に照度のピークとなるような照度分布となっている。これは、一般に、文字板の周囲に略垂直にソーラーセルを配置する電子時計の構造に起因するものである。風防部材２側からソーラーセル７ができるだけ視認できないように、ソーラーセル７が前記時計ケース１の段部の下に隠れるように平面的に段部１ａよりも外周に配置され、外部から入光する光が段部１ａによりさえぎられるため風防部材２側のソーラーセル７への入光量が少なくなる。また文字板５の周囲に、文字板５表示面より断面的に裏蓋３側にソーラーセル７が配置されると、外部から入光する光が文字板５によりさえぎられ文字板５側のソーラーセル７への入光量が少なくなるためである。 In the first embodiment shown in FIG. 1, as shown in FIG. 5 (a), the light incident on the solar cell power generation unit 7a is incident on the dial 5 side and the windshield member 2 side. The illuminance distribution is such that the illuminance peaks at a position slightly closer to the dial 5 side than the intermediate point on the dial 5 side and the windshield member 2 side. This is generally caused by the structure of an electronic timepiece in which solar cells are arranged substantially vertically around the dial. In order to prevent the solar cell 7 from being seen from the windshield member 2 side as much as possible, the solar cell 7 is planarly arranged on the outer periphery of the step portion 1a so as to be hidden under the step portion of the watch case 1, and enters from the outside. Since the light is blocked by the step portion 1a, the amount of light incident on the solar cell 7 on the windshield member 2 side is reduced. Further, when the solar cell 7 is arranged around the dial 5 on the back cover 3 side in section from the display surface of the dial 5, the light incident from the outside is blocked by the dial 5 and the solar on the dial 5 side. This is because the amount of light incident on the cell 7 is reduced.
ここで特許文献３に示すようにソーラーセル発電部７ａをそれぞれの発電領域の面積が均等となるように２分割すると、図５（ｂ）分割Ａに示すように、分割された文字板５に近い側の第１発電領域７ｍと風防部材２に近い側の第２発電領域７ｎに入光する光の単位面積あたりの平均照度は均等にならない。ここでソーラーセルの発電量は発電領域に入光する光の単位面積あたりの平均照度に応じて決定されるため、図５（ｂ）分割Ａのように、第１発電領域７ｍと第２発電領域７ｎのセル幅を等しくして分割すると、第１発電領域７ｍと第２発電領域７ｎとで発電する発電量に差が生じることになる。 Here, as shown in Patent Document 3, when the solar cell power generation unit 7a is divided into two so that the areas of the respective power generation regions are equal, the divided dial 5 is formed as shown in FIG. The average illuminance per unit area of light entering the first power generation region 7m on the near side and the second power generation region 7n on the side close to the windshield member 2 is not uniform. Here, since the power generation amount of the solar cell is determined according to the average illuminance per unit area of the light entering the power generation region, the first power generation region 7m and the second power generation are divided as shown in FIG. If the cell width of the region 7n is equal and divided, a difference occurs in the amount of power generated between the first power generation region 7m and the second power generation region 7n.
具体的に計算をしてみると、第１、第２発電領域７ｍ，７ｎの長辺の長さをＢ（μｍ）、第１、第２発電領域７ｍ，７ｎの短辺の長さをＤ（μｍ）、ソーラーセル発電領域に入光する光の単位面積あたりの平均照度をＥ（Ｌｘ）、特定の照度Ａ（Ｌｘ）における単位面積あたりの発電量をＣ（μＡ／ｃｍ2）としたとき、ソーラーセル発電領域の発電する発電量Ｆ（μＡ）は
Ｆ＝（Ｂ×１０-4×Ｄ×１０-4）×Ｃ×Ｅ／Ａ
で計算することができる。
ここで使用するソーラーセルの特性に応じて仮に、Ｂ＝５００００（μｍ）、Ａ＝２００（Ｌｘ）、Ｃ＝１５（μＡ／ｃｍ2）とし、それぞれの発電領域を、短辺の長さ２００（μｍ）の分割領域で分割したとき、ソーラーセル発電部の面積を均等に分割すると、それぞれの平均照度は図５（ｂ）分割Ａのようになる。第１発電領域７ｍは短辺の長さＤ１＝１２００（μｍ）、平均照度はＥ１＝９１．３（Ｌｘ）となり、第２発電領域７ｎは短辺の長さＤ２＝１２００（μｍ）、平均照度はＥ２＝１００．５（Ｌｘ）となる。以上の条件からそれぞれの発電領域の発電量を計算すると第１発電領域７ｍの発電量はＦ１＝４．１１（μＡ）、第２発電領域７ｎの発電量はＦ２＝４．５２（μＡ）と計算される。これ
より、ソーラーセル発電部７ａの面積を均等に分割すると、第１発電領域７ｍの発電量Ｆ１と第２発電領域７ｎの発電量Ｆ２では約１０％の差が生じることがわかる。
Specifically, the long side length of the first and second power generation regions 7m and 7n is B (μm), and the short side length of the first and second power generation regions 7m and 7n is D. (Μm), the average illuminance per unit area of light entering the solar cell power generation region is E (Lx), and the power generation amount per unit area at a specific illuminance A (Lx) is C (μA / cm 2 ). Then, the power generation amount F (μA) generated by the solar cell power generation area is F = (B × 10 −4 × D × 10 −4 ) × C × E / A
Can be calculated with
According to the characteristics of the solar cell used here, B = 50000 (μm), A = 200 (Lx), C = 15 (μA / cm 2 ), and each power generation region has a short side length of 200. When the area of the solar cell power generation unit is divided equally when divided in (μm) divided regions, the respective average illuminances are as shown in FIG. The first power generation region 7m has a short side length D1 = 1200 (μm), the average illuminance is E1 = 91.3 (Lx), and the second power generation region 7n has a short side length D2 = 1200 (μm), an average The illuminance is E2 = 100.5 (Lx). When the power generation amount of each power generation region is calculated from the above conditions, the power generation amount of the first power generation region 7m is F1 = 4.11 (μA), and the power generation amount of the second power generation region 7n is F2 = 4.52 (μA). Calculated. From this, it can be seen that when the area of the solar cell power generation unit 7a is equally divided, a difference of about 10% occurs between the power generation amount F1 of the first power generation region 7m and the power generation amount F2 of the second power generation region 7n.
前述したとおり、このような発電量に大小差があるソーラーセルを直列に接続して使用すると、発電量大の発電領域の発電量は、発電量小の発電領域の発電量と同等量に制限されてしまい、大発電が可能な発電領域が本来の発電能力を発揮できない非効率的な分割構成となってしまう。 As described above, when solar cells with large or small power generation differences are connected in series, the power generation amount in the power generation region with the large power generation amount is limited to the same amount as the power generation region in the power generation region with the small power generation amount. As a result, the power generation area where large power generation is possible becomes an inefficient division configuration in which the original power generation capacity cannot be exhibited.
次に図５（ｂ）分割Ｂに示すように、発電量が大きい風防部材２側の第２発電領域７ｎの面積を小さく、かつ発電量が小さい文字板５側の第１発電領域７ｍの面積を大きくするように、第２発電領域７ｎの短辺の長さＤ２＝１２００（μｍ）を１１５０（μｍ）に縮小し、第１発電領域７ｍの短辺の長さＤ１＝１２００（μｍ）を１２５０（μｍ）に拡大すると、第１発電領域７ｍの平均照度はＥ１＝９２．６（Ｌｘ）、第２発電領域７ｎの平均照度はＥ２＝１００．０（Ｌｘ）となる。このときのそれぞれの発電領域における発電量Ｆは前述の計算式から、第１発電領域７ｍの発電量Ｆ１＝４．３４（μＡ）、第２発電領域７ｎの発電量Ｆ２＝４．３１（μＡ）となり、第１発電領域７ｍの発電量Ｆ１と第２発電領域７ｎの発電量の差は約０．６％にまで低減されことがわかる。 Next, as shown in FIG. 5 (b) division B, the area of the second power generation region 7n on the side of the windshield member 2 where the power generation amount is large is small, and the area of the first power generation region 7m on the dial 5 side where the power generation amount is small. So that the short side length D2 of the second power generation region 7n = 1200 (μm) is reduced to 1150 (μm), and the short side length D1 of the first power generation region 7m is set to 1200 (μm). When enlarged to 1250 (μm), the average illuminance of the first power generation region 7m is E1 = 92.6 (Lx), and the average illuminance of the second power generation region 7n is E2 = 100.0 (Lx). The power generation amount F in each power generation region at this time is calculated based on the above-described calculation formula. The power generation amount F1 of the first power generation region 7m is 4.34 (μA), and the power generation amount F2 of the second power generation region 7n is 4.31 (μA). It can be seen that the difference between the power generation amount F1 in the first power generation region 7m and the power generation amount in the second power generation region 7n is reduced to about 0.6%.
これにより、第１発電領域７ｍと第２発電領域７ｎに分割されたソーラーセル発電領域を直列に接続して使用する場合、各々の発電領域の発電量がほぼ均等となるため、効率的な発電が可能となり、かつ、発電領域の面積が均等となるように分割するときに比べ、発電量も増大させることが可能なソーラーセルを構成することができる。
そして、分割領域７ｄを直線状にすることができるため、文字板５をとりかこむようにソーラーセル７を曲げても、ソーラーセル７にクラック等の破壊が生じ難い。
As a result, when the solar cell power generation area divided into the first power generation area 7m and the second power generation area 7n is connected in series, the power generation amount in each power generation area becomes almost equal, so that efficient power generation is possible. Therefore, it is possible to configure a solar cell capable of increasing the amount of power generation as compared with the case where the power generation region is divided so that the areas of the power generation regions are equal.
Since the divided region 7d can be linear, even if the solar cell 7 is bent so as to cover the dial 5, the solar cell 7 is unlikely to be broken such as cracks.
ここで、図１、図４に示すような多段ソーラーセルの分割方法において、見返しリング６の形状や文字板５の形状、第１の開口部１ｂの形状等が異なる場合、図５（ａ）に示す単位面積における平均照度の分布は当然ながら異なる。例えば、図５（ａ）の場合とは逆に、ソーラーセル発電部７ａの面積を均等に分割したとき、風防部材２側に形成された第２発電領域７ｎよりも文字板５側に形成された第１発電領域７ｍのほうが単位面積あたりの平均照度が高くなる場合、第２発電領域７ｎの面積を第１発電領域７ｍの面積よりも大きくすることで効率のよい発電が可能なソーラーセル構成とすることが可能である。 Here, in the method of dividing the multi-stage solar cell as shown in FIGS. 1 and 4, when the shape of the dial ring 6, the shape of the dial plate 5, the shape of the first opening 1b, and the like are different, FIG. The average illuminance distribution in the unit area shown in FIG. For example, contrary to the case of FIG. 5A, when the area of the solar cell power generation unit 7a is divided equally, it is formed closer to the dial plate 5 than the second power generation region 7n formed on the windshield member 2 side. In the case where the average illuminance per unit area is higher in the first power generation region 7m, a solar cell configuration capable of efficient power generation by making the area of the second power generation region 7n larger than the area of the first power generation region 7m Is possible.
次に、本発明の第２の実施形態を図６、図７を用いて説明する。 Next, a second embodiment of the present invention will be described with reference to FIGS.
図６は第２の実施の形態を示すソーラーセルの平置き状態を示す図であり、文字板５側に配置された第１発電領域７ｐと風防部材２側に配置された第２発電領域７ｑと、第１発電領域と第２発電領域の中間に配置されて、直線状の分割領域７ｆ、７ｇで分割された第３発電領域７ｒが構成され、それぞれ直列に接続されている。 FIG. 6 is a diagram showing a flat state of the solar cell according to the second embodiment, and the first power generation region 7p disposed on the dial plate 5 side and the second power generation region 7q disposed on the windshield member 2 side. And the 3rd electric power generation area | region 7r arrange | positioned in the middle of the 1st electric power generation area | region and the 2nd electric power generation area | region and divided | segmented by the linear division | segmentation area | regions 7f and 7g is comprised, and each is connected in series.
図６で示すソーラーセルを配置する基本的な部品構成は図１、図２で述べた第１の実施の形態と同様であるため、説明を省略する。
第１の実施の形態の説明において述べたように、図１に示す構成においては、風防部材２の上面より無指向性の光が照射されたときにソーラーセル発電部７ｅへ入光する光の照度分布をシミュレートすると、図５（ａ）に示すように、文字板５側、風防部材２側に近い範囲では入光量が少なく、文字板５側、風防部材２側の中間地点よりやや文字板５側に近い位置に照度のピークとなるような照度分布となる。図６で示したソーラーセルでは、第１発電領域７ｐおける文字板２側の端部が、文字板５の表示面（風防部材側の面）よりも断面的に裏蓋３側まで延在しているため外部から入光する光が文字板５によりさえぎられて第１発電領域７ｐに入光する光が減少し、第２発電領域７ｑにおける風防部材２側の端
部が、時計ケース１と平面的に重なるため外部から入光する光が段部１ａ付近にさえぎられて第２発電領域７ｑに入光する光が減少する。従って、このソーラーセルの発電領域７ｅの面積が均等になるように３分割すると図７分割Ａのように各々の第１発電領域７ｐ、第２発電領域７ｑ、第３発電領域７ｒに入光する光の照度が均等にならない。そのため、それぞれの発電領域で発電される発電量に差が生じる。
The basic component configuration for arranging the solar cell shown in FIG. 6 is the same as that of the first embodiment described in FIGS.
As described in the description of the first embodiment, in the configuration shown in FIG. 1, the light that enters the solar cell power generation unit 7 e when omnidirectional light is irradiated from the upper surface of the windshield member 2. When the illuminance distribution is simulated, as shown in FIG. 5A, the amount of incident light is small in the range close to the dial plate 5 side and the windshield member 2 side, and the characters are slightly higher than the intermediate points on the dial plate 5 side and the windshield member 2 side. The illuminance distribution is such that the illuminance peak is at a position close to the plate 5 side. In the solar cell shown in FIG. 6, the end portion on the dial plate 2 side in the first power generation region 7p extends in cross section from the display surface of the dial plate 5 (surface on the windshield member) to the back cover 3 side. Therefore, the light entering from the outside is blocked by the dial 5 and the light entering the first power generation region 7p is reduced, and the end portion on the windshield member 2 side in the second power generation region 7q is connected to the watch case 1. Since they overlap in a plane, the light entering from the outside is blocked near the stepped portion 1a, and the light entering the second power generation region 7q is reduced. Accordingly, when the solar cell power generation region 7e is divided into three equal areas, the light enters the first power generation region 7p, the second power generation region 7q, and the third power generation region 7r as shown in FIG. 7A. The illuminance of light is not uniform. Therefore, a difference occurs in the amount of power generated in each power generation region.
具体的に計算してみると、ソーラーセル発電領域７ｅを均等な面積になるように、分割領域を短辺の長さ２５０（μｍ）の分割領域により３分割すると、それぞれの発電領域における平均照度は、図７分割Ａのようになる。第１発電領域７ｐは短辺の長さＤ１＝７００（μｍ）、平均照度Ｅ１＝６０．２（Ｌｘ）となり、第２発電領域７ｑは短辺の長さＤ２＝７００（μｍ）、平均照度Ｅ２＝８９．５（Ｌｘ）となり、第３の発電領域７ｒは短辺の長さＤ３＝７００（μｍ）、発電領域の平均照度Ｅ３＝１２４．１（Ｌｘ）となる。以上の条件からそれぞれの発電量を第１の実施の形態の説明で述べた計算式を用いて計算すると、第１発電領域７ｐの発電量Ｆ１＝１．５８（μＡ）、第２発電領域７ｑの発電量Ｆ２＝２．３５（μＡ）、第３発電領域７ｒの発電量Ｆ３＝３．２６（μＡ）と計算される。これより発電領域を均等な面積に３分割すると、最大最小発電量の比較において、約１０６．２％の差が生じることが分かる。 Specifically, when the divided area is divided into three by a divided area having a short side length of 250 (μm) so that the solar cell power generation area 7e has an equal area, the average illuminance in each power generation area Is as shown in FIG. The first power generation region 7p has a short side length D1 = 700 (μm) and an average illuminance E1 = 60.2 (Lx), and the second power generation region 7q has a short side length D2 = 700 (μm) and an average illuminance. E2 = 89.5 (Lx), and the third power generation region 7r has a short side length D3 = 700 (μm), and the average illuminance E3 = 12.41 (Lx) of the power generation region. When the respective power generation amounts are calculated using the calculation formula described in the description of the first embodiment from the above conditions, the power generation amount F1 = 1.58 (μA) of the first power generation region 7p and the second power generation region 7q. Power generation amount F2 = 2.35 (μA), and power generation amount F3 of the third power generation region 7r = 3.26 (μA). From this, it can be seen that when the power generation region is divided into three equal areas, a difference of about 106.2% occurs in the comparison of the maximum and minimum power generation amounts.
前述したとおり、このような発電量に大小差があるソーラーセルを直列に接続して使用すると、発電量大の発電領域の発電量は、発電量小の発電領域の発電量と同等量に制限されてしまい、大発電が可能な発電領域が本来の発電能力を発揮できない非効率的な分割構成となってしまう。 As described above, when solar cells with large or small power generation differences are connected in series, the power generation amount in the power generation region with the large power generation amount is limited to the same amount as the power generation region in the power generation region with the small power generation amount. As a result, the power generation area where large power generation is possible becomes an inefficient division configuration in which the original power generation capacity cannot be exhibited.
次に、図７分割Ｂに示すように、文字板５側に設けられた第１発電領域７ｐと第１発電領域よりも風防部材２側に形成された第２発電領域７ｑは、第１、第２発電領域７ｐ，７ｑにはさまれた第３発電領域７ｒよりも大きい面積となり、さらに、第１発電領域７ｐが第２発電領域７ｑよりも大きい面積となるように、第１発電領域７ｐの短辺の長さをＤ１＝８５０（μｍ）、第２発電領域７ｑの短辺の長さをＤ２＝７００（μｍ）、第３発電領域７ｒの短辺の長さをＤ３＝５５０（μｍ）とすると、それぞれの発電領域における平均照度は第１発電領域７ｐの平均照度Ｅ１＝７２．１（Ｌｘ），第２発電領域７ｑの平均照度Ｅ２＝８９．５（Ｌｘ）、第３発電領域７ｒの平均照度Ｅ３＝１２０．９（Ｌｘ）となる。このときそれぞれの発電量を前述の計算式を用いて計算すると、第１発電領域７ｐの発電量Ｆ１＝２．３０（μＡ）、第２発電領域７ｑの発電量Ｆ２＝２．３５（μＡ）、第３発電領域７ｒの発電量Ｆ３＝２．５（μＡ）となり、最大最小発電量を比較すると、約８．５％の差にまで低減させることができることがわかる。 Next, as shown in FIG. 7 division B, the first power generation region 7p provided on the dial plate 5 side and the second power generation region 7q formed on the windshield member 2 side from the first power generation region are the first, The first power generation region 7p has a larger area than the third power generation region 7r sandwiched between the second power generation regions 7p and 7q, and further, the first power generation region 7p has a larger area than the second power generation region 7q. D1 = 850 (μm), the short side length of the second power generation region 7q is D2 = 700 (μm), and the short side length of the third power generation region 7r is D3 = 550 (μm). ), The average illuminance in each power generation region is the average illuminance E1 = 72.1 (Lx) of the first power generation region 7p, the average illuminance E2 = 89.5 (Lx) of the second power generation region 7q, and the third power generation region The average illuminance E3 of 7r is 120.9 (Lx). At this time, when the respective power generation amounts are calculated using the above-described calculation formula, the power generation amount F1 = 2.30 (μA) in the first power generation region 7p and the power generation amount F2 = 2.35 (μA) in the second power generation region 7q. The power generation amount F3 of the third power generation region 7r is 2.5 (μA), and it can be seen that the maximum and minimum power generation amounts can be reduced to a difference of about 8.5%.
このように、それぞれの発電領域の面積が均等になるように発電領域を３分割したときに比べ、それぞれの発電領域における発電量の差を小さくしてほぼ均等にすることができ、それぞれの発電領域がより発電能力を十分に発揮することができる。
また、分割領域７ｆと７ｇを直線状にすることができるため、文字板５をとりかこむようにソーラーセル７を曲げても、ソーラーセル７にクラック等の破壊が生じ難い。
Thus, compared with the case where the power generation area is divided into three so that the areas of the respective power generation areas are equal, the difference in the power generation amount in each power generation area can be made smaller and almost equalized. The area can fully demonstrate the power generation capacity.
Further, since the divided regions 7f and 7g can be made linear, even if the solar cell 7 is bent so as to cover the dial 5, the solar cell 7 is unlikely to break, such as cracks.
ここで、図１、図６に示すような多段ソーラーセル分割方法について述べてきたが、見返しリング形状や文字板の形状、第１の開口部の形状等により図５（ａ）に示す単位面積における平均照度の分布は当然ながら異なる。例えば、第２の実施の形態のように、発電領域を均等に３分割したとき、第１発電領域７ｐよりも第２発電領域７ｑのほうが単位面積あたりの平均照度が高い場合、第１発電領域７ｐの面積を第２発電領域７ｑの面積よりも大きくすることで各発電領域の平均照度差を低減でき、効率の良い発電が可能である。また、例えば、第２の実施の形態とは逆に、第２発電領域７ｑよりも第１発電領域７ｐのほうが単位面積あたりの平均照度が高い場合、第２発電領域７ｑの面積を第１発電領域７ｐ
の面積よりも大きくすることで各発電領域の平均照度差を低減でき、効率の良い発電が可能である。
Here, the multi-stage solar cell dividing method as shown in FIG. 1 and FIG. 6 has been described, but the unit area shown in FIG. 5 (a) depends on the dial ring shape, dial shape, first opening shape, etc. Naturally, the distribution of the average illuminance is different. For example, as in the second embodiment, when the power generation region is equally divided into three, when the second power generation region 7q has a higher average illuminance per unit area than the first power generation region 7p, the first power generation region By making the area of 7p larger than the area of the second power generation region 7q, the average illuminance difference of each power generation region can be reduced, and efficient power generation is possible. Further, for example, contrary to the second embodiment, when the average illuminance per unit area is higher in the first power generation region 7p than in the second power generation region 7q, the area of the second power generation region 7q is set to the first power generation region 7q. Region 7p
By making it larger than the area, the average illuminance difference in each power generation region can be reduced, and efficient power generation is possible.
また、第２の実施の形態において、見返しリング形状や文字板の形状、第１の開口部の形状等によっては、第１発電領域７ｐと第２発電領域７ｑの面積を同じ面積にしたときに、第１発電領域７ｐと第２発電領域７ｑの単位面積あたりの平均照度が同じであり、第１及び第２発電領域７ｐ，７ｑよりも面積の小さな第３発電領域７ｒの単位面積あたりの平均照度が大きくなることも考えられる。また、第１発電領域と第２発電領域の単位面積あたりの平均照度に差があっても、その差が、第１発電領域７ｐと第２発電領域７ｑの面積を同じにしても実用上影響がない場合もある。これらの場合には、第１発電領域７ｐと第２発電領域７ｑが、同じ面積で、且つ、第３発電領域７ｒよりも大きな面積になるようにしてもよい。 In the second embodiment, when the area of the first power generation region 7p and the second power generation region 7q is the same, depending on the shape of the dial ring, the shape of the dial, the shape of the first opening, etc. The average illuminance per unit area of the first power generation region 7p and the second power generation region 7q is the same, and the average per unit area of the third power generation region 7r having a smaller area than the first and second power generation regions 7p, 7q The illuminance may be increased. Further, even if there is a difference in average illuminance per unit area between the first power generation region and the second power generation region, the difference has a practical effect even if the areas of the first power generation region 7p and the second power generation region 7q are the same. There may be no. In these cases, the first power generation region 7p and the second power generation region 7q may have the same area and a larger area than the third power generation region 7r.
また、第１の実施の形態はソーラーセル発電部７ａを２分割、第２の実施の形態は、ソーラーセル発電部７ｅを３分割したが、ソーラーセル発電部７ａや７ｅを４分割以上に分割したものにも適用することができる。
また、第１の実施の形態、および第２の実施の形態ともに分割領域は直線状としているが、櫛歯状の分割領域として姿勢差による照度バラツキの軽減をはかってもよい。
In the first embodiment, the solar cell power generation unit 7a is divided into two. In the second embodiment, the solar cell power generation unit 7e is divided into three. However, the solar cell power generation units 7a and 7e are divided into four or more divisions. It can also be applied to
Further, although the divided areas are linear in both the first embodiment and the second embodiment, the variation in illuminance due to the posture difference may be reduced as a comb-shaped divided area.
１、１００ 時計ケース
１ａ 段部
１ｂ 第１の開口部
１ｃ 第２の開口部
２、１０２ 風防部材
３、１０３ 裏蓋
４，１０４ 時計ムーブメント
４ｂ １０４ａ ソーラーセル保持部
５、１０５ 文字板
６、１０６ 見返しリング
７、１０７ ソーラーセル
７ａ、７ｅ ソーラーセル発電部
７ｂ、７ｃ ソーラーセル非発電部
７ｄ、７ｆ、７ｇ ソーラーセル分割領域
７ｍ、７ｐ 第１発電領域
７ｎ、７ｑ 第２発電領域
７ｒ 第３発電領域
８ ソーラーセル端子
DESCRIPTION OF SYMBOLS 1,100 Timepiece case 1a Step part 1b 1st opening part 1c 2nd opening part 2,102 Windshield member 3,103 Back cover 4,104 Clock movement 4b 104a Solar cell holding part 5,105 Dial 6,106 Look-back Ring 7, 107 Solar cell 7a, 7e Solar cell power generation unit 7b, 7c Solar cell non-power generation unit 7d, 7f, 7g Solar cell split region 7m, 7p First power generation region 7n, 7q Second power generation region 7r Third power generation region 8 Solar cell terminal
Claims (8)
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