JP2967411B2 - Power generating device and electronic timepiece using the power generating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator using a thermoelectric element and an electronic timepiece using the power generator.

[0002]

[Technical background] An electronic watch using electric power as an energy source
In general, the watch movement is provided directly with a power storage device such as a battery and directly supplies power to the timepiece movement.However, a power generation device is provided to gradually generate power, and the power is temporarily stored in the power storage device. Later, there is a type that supplies power to the movement. This type of timepiece is economical because it saves the trouble of changing batteries. In particular, Japanese Patent Application Laid-Open No. Hei 8-29558 proposes a thermoelectric element utilizing the Seebeck effect as a power generation means and having it incorporated in a watch case.

This device is provided with a first insulator having heat conductivity, a second insulator having heat conductivity, and a terminal portion for extracting an electromotive force with the outside. A thermoelectric element in which an insulator and a second insulator are alternately connected in series with a plurality of n-type and p-type semiconductors and connected to and connected to a terminal portion is electrically connected to the timepiece movement via a power storage means. The second insulator is inserted into the outer body so that the second insulator is in close contact with the arm of the human body and the first insulator is open to the space.

In the electronic timepiece constructed as described above, the semiconductor temperature generated by the temperature difference between the first insulator and the second insulator using the body temperature of the arm of the human body as a high heat source and the outside air temperature as a low heat source. In the n-type semiconductor, electrons move to the lower heat source side, and in the p-type semiconductor, positive holes move to the lower heat source side to generate electric power. It has become.

The power generation capacity of the thermoelectric element thus configured is proportional to the number of thermoelectric element elements made of n-type and p-type semiconductors. It has the characteristic that it increases and the power generation efficiency also increases.

[0006]

Accordingly, a corresponding power for operating the movement is obtained by adjusting the number of thermoelectric elements made of n-type and p-type semiconductors and the thickness and number of the thermoelectric elements. However, in the case of a multifunctional electronic timepiece that requires more power consumption, if the desired power is obtained by the thermoelectric element alone, the size of the electronic timepiece naturally increases, which hinders miniaturization of the electronic timepiece. At the same time, it may restrict the freedom of design. Even if it is composed of a plurality of thermoelectric elements, the shape of the storage section becomes complicated, and the assembling work is troublesome. Moreover, the thermoelectric element itself is very weak in terms of strength and requires careful handling.

Accordingly, the present invention is advantageous in design because it has a desired power generation capability, is compact, has sufficient strength to be incorporated in an electronic timepiece, is easy to handle, and does not hinder miniaturization of the electronic timepiece. It is an object to provide a power generation device and an electronic timepiece using the same.

[0008]

The technical means taken to achieve the above object is to provide a first thermoelectric element substrate having heat conductivity and insulation and a pair of terminals for taking out an electromotive force. A second thermoelectric element substrate having an insulating property is alternately connected in series with a plurality of thermoelectric element elements made of n-type and p-type semiconductors, and both ends are connected to the pair of terminal portions, respectively. A thermoelectric element that generates power by a thermal gradient in the thermoelectric element caused by a temperature difference between the thermoelectric element substrate and the second thermoelectric element substrate, the first substrate having heat conductivity and the second substrate having heat conductivity have heat insulation properties. A plurality of the thermoelectric elements are provided in the housing, and a second thermoelectric element substrate is provided on the second substrate. To each And the first thermoelectric element substrate of each of the thermoelectric elements is in heat transferable contact with the first substrate via a fluid having heat conductivity, and the thermoelectric elements are respectively connected via the pair of terminal portions. And are connected in series.

According to the above technical means, the temperature difference between the first substrate connected to the first thermoelectric element substrate via the fluid having heat conductivity and the second substrate fixed to the second thermoelectric element substrate. As a result, heat is transmitted only to a plurality of thermoelectric element elements made of n-type and p-type semiconductors connected in series without passing through the side plate, and a thermal gradient is generated. Then, in the thermoelectric element element made of the n-type semiconductor, the electrons move to the low heat source side, and in the thermoelectric element element made of the p-type semiconductor, the positive holes move to the low heat source side to generate electric power. Further, by housing a number of thermoelectric elements according to a desired power in a housing constituted by the first substrate, the second substrate, and the side plate, a desired power is output and a plurality of thermoelectric elements are integrally formed. Protect. Moreover, the fluid having heat conductivity in the minute gap formed between the first thermoelectric element substrate and the first substrate absorbs the distortion of the thermoelectric element due to thermal deformation, thereby protecting the thermoelectric element.

[0010] The fluid having heat conductivity mentioned here includes, for example, a silicone resin mixed with a heat conductive powder having a high thermal conductivity such as Au, Ag, Cu, Al, and alumina. Further, the first substrate and the second substrate are preferably made of a non-ferrous metal having high thermal conductivity such as Al and Cu. A printed circuit board having a wiring that is in close contact with the pair of terminal portions of each of the thermoelectric elements and that connects the thermoelectric elements in series; and a printed board that is disposed between the printed board and the first substrate. It is preferable that a holding member that closely adheres the substrate to the terminal portion and has heat insulating properties is provided.

[0011] With this configuration, wiring between the thermoelectric elements can be easily performed, and the holding member having heat insulating property ensures connection between the pair of terminal portions and the printed circuit board. In addition, heat transfer between the first substrate and the second substrate is interrupted to transfer heat only to the thermoelectric element. The material of the holding member having heat insulation is not particularly limited as long as it has heat insulation, but it is preferable that the printed board is securely adhered to the terminal portion, but a predetermined space between the first substrate and the second substrate is provided. A material that can be elastically deformed so as to securely fit in the gap is preferable, and examples thereof include foamed polyurethane.

The external shape of the power generation device and the arrangement of the thermoelectric elements are not particularly limited. However, the external shape of the housing has a columnar shape, a ring shape, or an arc shape. What is arranged in the circumferential direction so that each of the terminal portions faces inward, and the appearance of the housing has a rectangular parallelepiped shape, and the thermoelectric element is such that the respective terminal portions face each other. Those that are arranged oppositely, especially when incorporated into an electronic watch,
These shapes are preferable because they are close to the external shape of the timepiece or the shape of the constituent members, so that they can be easily incorporated, or have an advantageous shape in terms of design design.

When the above-described power generating device is applied to an electronic timepiece equipped with a clock movement, the power generating device generates power using the body temperature of the arm of a human body as a high heat source and the outside air temperature as a low heat source. It is desirable to be installed in the watch case. As a mode of the interior, a power generation device is provided in the back cover of the watch, the power generation device itself is configured as a back cover of the watch, or one of the insulators is in direct contact with the arm of the human body, and The other insulator is inserted into the outer body so as to be open to the space, and is not particularly limited, and is arbitrary.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a power generator according to the present invention and an electronic timepiece using the power generator will be described with reference to the drawings. FIGS. 1 to 15 show first to seventh embodiments of the power generator according to the present invention, and FIG.
Electronic timepieces incorporating the power generating device of the embodiment of the present invention.

(Embodiment 1) A power generator A according to Embodiment 1 of the present invention will be described. The power generation device 100 includes a thermoelectric element 1 and a housing 2 as shown in FIGS. 1 and 2, and has a ring-shaped appearance. The thermoelectric element 1 has a plate-shaped first thermoelectric element substrate 11 having heat conductivity and insulation properties, and a rectangular shape having heat conductivity and insulation properties and slightly extending from the first thermoelectric element board 11. The second thermoelectric element substrate 12 is provided so as to connect the first thermoelectric element substrate 11 to the second thermoelectric element substrate 12 and the first thermoelectric element substrate 11 and the second thermoelectric element substrate 12. Thermoelectric element 1 made of a plurality of n-type and p-type semiconductors connected alternately in series by wiring (not shown) formed on respective opposing surfaces of the thermoelectric element 1
3 is provided. A pair of terminals 14a and 14b for taking out an electromotive force is provided at an end of the second thermoelectric element substrate 12 which is not opposed to the first thermoelectric element substrate 11, and FIG. 3 in which the flexible substrate 28 is removed from FIG. As shown, the pair of terminal portions 14a and 14b are configured to protrude outside the first thermoelectric element substrate 11.

The thermoelectric element 1 includes a first thermoelectric element substrate 11
Electric power is generated by a thermal gradient in the thermoelectric element 13 caused by a temperature difference between the thermoelectric element 13 and the second thermoelectric element substrate 12. The housing 2 includes a first substrate 21 and a second substrate 22 having heat conductivity, and the first substrate 21 and the second substrate 22 each have an opening 21 having a predetermined diameter.
a, 22a have the same shape as a hollow disk with an opening.
The first substrate 21 and the second substrate 22 are opposed to each other and held at a predetermined interval by heat-insulating annular side plates 25 and 26 that engage the outer peripheral edge and the inner peripheral edge. ing. The side plates 25 and 26 have step portions 25a and 26a protruding inward and outward respectively, and the upper and lower surfaces of the step portions 25a and 26a in the figure abut on the first substrate 21 and the second substrate 22. The side plates 25 and 26 have flange portions 25b and 26b that contact the outer peripheral surface and the inner peripheral surface of the first substrate 21 and the second substrate 22, respectively. Here, the predetermined interval between the first substrate 21 and the second substrate 22 is determined in consideration of variation in the thickness direction of the thermoelectric element 1 and a necessary clearance for absorbing thermal deformation. Side plates 25, 2
6 is determined by the thickness of the steps 25a and 26a. In addition, the side plates 25 and 26 are provided with flange portions 25b and 26 that contact the outer peripheral end surface and the inner peripheral end surface of the first substrates 21 and 22, respectively.
b, positioning of the side plates 25 and 26 with the first substrate 21 and the second substrate 22 is facilitated.

A plurality of desired thermoelectric elements 1 are arranged in the housing 2 in the circumferential direction so that the respective terminal portions 14a and 14b face inward in the housing 2 configured as described above. Each is fixed on the second substrate 22. Further, a predetermined gap is provided between the first thermoelectric element substrate 11 and the first substrate 22, and each gap is made of Au, Ag, Cu, A
1, a fluid 27 made of a liquid silicone resin or the like in which a heat conductive powder having a high thermal conductivity such as alumina is dispersed,
The first thermoelectric element substrate 11 and the first substrate 21 are in contact with each other so that heat can be transferred. In addition, each thermoelectric element 1 has its respective terminal portions 14a and 14b connected in series via a flexible substrate 28.

As shown in FIG. 4, the flexible substrate 28 has a substantially ring-shaped main body 28a and a lead portion 28b extending from one portion thereof. In addition, the flexible substrate 28 has a wiring pattern 28c for connecting the terminal portions 14a and 14b having the opposite polarities of the adjacent thermoelectric elements 1.
The wiring pattern connected to the terminal portions 14a and 14b at both ends of the thermoelectric element 1 connected in series
8b is connected to output terminals 28d and 28e. In addition, the lead portion 28b of the flexible substrate 28
Project outside the housing 2 through an opening 25c formed in the outer side plate 25. In FIG. 1, for convenience of explanation, the wiring pattern 28c is shown in a see-through manner.

The flexible substrate 28 has a heat insulating and elastically deformable ring-shaped pressing member 29 made of foamed polyurethane or the like so that the wiring pattern 28c is in close contact with the terminal portions 14a and 14b of the thermoelectric element 1. Are provided so as to be pressed by the second thermoelectric element substrate 12. The flexible substrate 28 may be bonded to the second thermoelectric element substrate 12, but is not necessarily required to be bonded as long as positioning is possible. In addition, the pressing member 29 ensures that the flexible substrate 28 is in close contact with the terminal portions 14a and 14b, and the distance between the first substrate 11 and the second substrate 12 is determined by the step portions 25a and 26a of the side plates 25 and 26. It is not always necessary to be elastically deformable as long as it has a thickness that can be held at a predetermined interval. However, in consideration of a dimensional error of the pressing member 29, the pressing member 29 is formed to be slightly thicker than a predetermined size with an elastically deformable material. Is preferred.

The power generator 100 according to the first embodiment having the above-described configuration includes the first thermoelectric element substrate 1 via the fluid 27.
1 and the second thermoelectric element substrate 12
A temperature difference is generated between the second substrate 22 and the second substrate 22, so that the thermoelectric element is composed of a plurality of n-type and p-type semiconductors connected in series without passing through the side plates 25 and 26 and the pressing member 29. Heat is transferred only via 13 to create a thermal gradient. Then, in the thermoelectric element element made of an n-type semiconductor, electrons move to the low heat source side,
In a thermoelectric element element made of a p-type semiconductor, electric power is generated by the movement of positive holes to a low heat source side,
The output is output to the outside via the output terminals 28d and 28e of the flexible substrate 28.

In the power generator 100 of this embodiment, for example, even if the thermoelectric element 1 thermally expands, its deformation is
The gap secured between the first substrate 21 and the first thermoelectric element substrate 11 and filled with the fluid 27 is absorbed and the thermoelectric element 1 is not broken. This gap is
The dimensional error of the thermoelectric element 1 itself is also absorbed, and the fluid 27
Also has the function of absorbing the impact received by the power generation device 100.

The second substrate 22 and the flexible substrate 2
8 is pressed by the pressing member 29, but the first substrate 21 and the first thermoelectric element substrate 11 are not fixed, so the thermoelectric element 1 is excessively pressed.
Destruction of itself is prevented. Further, since the power generation device 100 of the present embodiment incorporates the plurality of thermoelectric elements 1 in the casing, even if a failure or the like occurs in any of the thermoelectric elements 1, only the thermoelectric element 1 can be replaced. Therefore, the maintenance cost can be significantly reduced.

Although the above-described power generator 100 can be incorporated in various electronic timepieces, any one of the first and second thermoelectric element substrates may be used as a heat collector. (Embodiment 2) Next, a power generator 100A of Embodiment 2 will be described with reference to FIG. The power generating device 100A is configured such that the shape of the second substrate 22 and the annular side plate 2
Embodiment 6 is basically the same as Embodiment 1 except that the housing 2 is configured with a difference only in the shape of 6, and other common configurations are denoted by the same reference numerals and description thereof is omitted.

The second substrate 122 of the second embodiment is a disk-shaped member having substantially the same diameter as the outer diameter of the first substrate 21. The inner side plate 126 has a flange of a step portion 126a at the top. A protrusion 126c protruding inward of the housing 2 is provided at an end on the second substrate 122 side at a boundary with the portion 126b. The protrusion 126c has the same thickness as the first thermoelectric element substrate 12, and supports the flexible substrate 28 from below in the figure.
Thereby, the terminal portions 14a, 1 of the second thermoelectric element substrate 12 are formed.
Even if the portion provided with 4b does not protrude sufficiently from the first thermoelectric element substrate 11, the flexible substrate 28 can be supported by the protrusion 126c, and the flexible substrate 28
The connection via is ensured.

Also, as described above, the second substrate 122
Does not have an opening similar to the opening 21a of the first substrate 21, so that by setting the second substrate 122 on the heat collecting portion side, the heat collecting efficiency can be greatly increased. (Embodiment 3) The power generation device 100B of this embodiment is shown in FIG.
As shown in FIG. 5, instead of the second substrate 122 of the second embodiment, the second substrate 22 has substantially the same shape as the second substrate 122, but has a convex portion 222a projecting downward at the center in the figure.
It may be 2. In this case, by matching the shape of the convex portion 222a with, for example, the shape of the inner surface of the back cover of the wristwatch, positioning in the back cover and adhesion to the back cover can be ensured. Heat collection performance can be improved. It goes without saying that the second substrate 222 itself may be used as a back cover of a wristwatch.

(Embodiment 4) FIGS. 7 and 8 show a power generator 100C according to Embodiment 4. FIG. In this embodiment, the inner side plate 26, the flexible substrate 28, and the pressing member 29 of the first embodiment are removed, and a ring-shaped pattern having a wiring pattern 128a for connecting adjacent heating elements 1 instead of the flexible substrate 28 is provided. Is fixed on the second substrate 222, and the terminal portions 14a,
By connecting the wiring patterns 14b and the respective wiring patterns 128a via the wire bonding 128b, all the heat transfer elements 1 are connected in series.

(Embodiment 5) Next, a power generator according to Embodiments 5 to 9 will be described with reference to FIGS. In addition,
These basic configurations are substantially the same as those described above, and the only differences are their external shapes. Therefore, other common configurations are given the same reference numerals and description thereof is omitted. As shown in FIG. 9, the power generating device 100 </ b> D according to the fifth embodiment includes an arc-shaped first substrate 12 having a required length on a disc-shaped second substrate 122.
1 and side plates 225 and 226, etc., in which the thermoelectric element 1 is arranged in an arc shape with its terminal portions 14a, 14b facing inward. Thereby, for example, power generation device 100D can be installed in a desired space of a wristwatch. As shown in FIG. 10, in the power generation device 100D, the first substrate may also be an arc-shaped second substrate 322, and fixing portions 322a for fixing the power generation device 100D may be provided at both ends.

(Embodiment 6) In addition, as shown in FIGS. 11 and 12, a power generating apparatus 100E according to Embodiment 6 has a disk-shaped first substrate instead of the first substrate 21 and the second substrate 22. The configuration is the same as that of the first embodiment except that the external shape is configured to be a columnar shape including the 421 and the second substrate 422. Note that a positioning spacer 430 made of a disc-shaped heat insulating member is fixed to the center of the second substrate 22, and each thermoelectric element 1 is fixed around the positioning spacer 430. Further, instead of the ring-shaped flexible substrate 28, a disk-shaped flexible substrate 228 is used and fixed to the positioning spacer 430, thereby positioning the flexible substrate 228 and each of the thermoelectric elements 14a and 14b. The flexible substrate 228 is pressed by a disc-shaped heat insulating holding member 129.

(Embodiment 7) The power generator 10 of Embodiment 7
OF is the first substrate 52 as shown in FIG. 13 and FIG.
The first embodiment is the same as the first embodiment except that the outer shape of the first and second substrates 522 and the side plate 325 is formed in a rectangular parallelepiped shape. Here, each heating element 1 is connected to each terminal section 14.
a and 14b are arranged so as to face each other.
In addition, a flexible substrate 328 formed in a strip shape so that the generated power can be extracted to the outside is provided so as to straddle each of the terminal portions 14a and 14b arranged opposite to each other, and a wiring pattern 328c Are alternately connected in series with the terminal portions 14a and 14b, and the wiring patterns 328c at both ends are connected to the lead portions 32a and 14b.
8b are connected to output terminals 328d and 328e.
The flexible board 328 is connected to the terminal portion 14 by a rod-shaped pressing member 329 having heat insulation and elastically deformable.
a, 14b. The side plate 325 is a substantially rectangular member sandwiched between the outer edges of the first substrate 521 and the second substrate 522, and has an opening 325a for projecting the lead portion 328b of the flexible substrate 328 to the outside.
Having. FIG. 13 shows the flexible substrate 328.
Is shown transparently.

In each of the embodiments described above, the first substrate and the second substrate are formed in a plate shape. However, the present invention is not limited to this. For example, as shown in FIG. Between the substrate 621 and the second substrate 622, the thermoelectric element 1
May be formed to stand upright. This power generator 10
OG can be heated by, for example, being put on an arm, whereby the inner second substrate 622 is in close contact with the arm and collects heat.

(Embodiment 8) Next, an electronic timepiece incorporating the power generator 100 according to the present invention will be described with reference to FIG. Note that the power generation device 100 is a ring-shaped device exemplified in the first embodiment, and the description of the configuration has been described above, and thus will be omitted. The electronic timepiece includes a watch case 3 and a power generator 10.
0.

The watch case 3 includes a timepiece movement 32 which is housed in the outer case 31 and is driven by electric power, and a back cover 34 screwed to the inner case 33 fitted in the outer case 31. The power generating device 100 is provided in the timepiece case 3 by being urged by a resilient member 35 appropriately suspended in the circumferential direction from the inside of the outer shell 31 so that the second substrate 22 side is in close contact with the inside of the back cover 34. It is electrically connected to the timepiece movement 32 via a flexible substrate (not shown).

In the electronic timepiece thus constructed, the body temperature of the arm is transmitted to the second substrate 22 via the back cover 34 when the electronic timepiece is mounted on the arm of the human body. The clock movement 32 is driven by the electric power generated based on the temperature difference between the first substrate 21 and the radiated heat. In addition,
In the present embodiment, the power generator is provided in the watch case.
The back cover may be constituted by a power generator. The power generator 10
A battery or a capacitor for temporarily storing the power generated at 0 may be provided as appropriate.

It is needless to say that the above-described other power generating devices 100A to 100G and the like can be appropriately incorporated in the electronic timepiece in place of the power generating device 100.

[0035]

As described above, the present invention has the following advantageous effects. By housing a number of thermoelectric elements according to a desired power in a housing constituted by the first substrate, the second substrate, and the side plate, it is possible to have a desired power generation capacity, and furthermore, a plurality of thermoelectric elements are provided. Since it is integrally protected, it is possible to provide a compact and easy-to-handle power generator satisfying the strength. In addition, the thermoelectric element may be damaged by the heat-transferring fluid interposed in the minute gap formed between the first thermoelectric element substrate and the first substrate, absorbing the distortion of the thermoelectric element due to thermal deformation. And stable power can be supplied for a long period of time.

Further, the holding member having heat insulation ensures the connection between the pair of terminals and the printed board, and interrupts the heat transfer between the first board and the second board to provide a thermoelectric element element. Since heat is transferred only to the heat sink, stable performance without heat loss can be maintained. By applying such a power generation device to an electronic timepiece, an electronic timepiece that is reduced in size without increasing the size of the power generation device can be provided even if the power generation device requires power consumption.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a power generator according to Embodiment 1 of the present invention.

FIG. 2 is a vertical sectional view of the power generator according to Embodiment 1 of the present invention.

FIG. 3 is a cross-sectional view of the power generator according to the first embodiment of the present invention in which some members are removed.

FIG. 4 is a plan view showing a flexible substrate according to the first embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a power generator according to Embodiment 2 of the present invention.

FIG. 6 is a longitudinal sectional view of a power generator according to Embodiment 3 of the present invention.

FIG. 7 is a cross-sectional view of a power generator according to Embodiment 3 of the present invention.

FIG. 8 is a longitudinal sectional view of a power generator according to Embodiment 3 of the present invention.

FIG. 9 is a plan view of a power generator according to Embodiment 4 of the present invention.

FIG. 10 is a plan view showing a modification of the fourth embodiment of the present invention.

FIG. 11 is a plan view of a power generator according to Embodiment 5 of the present invention.

FIG. 12 is a longitudinal sectional view of a power generator according to Embodiment 5 of the present invention.

FIG. 13 is a cross-sectional view of a power generator according to Embodiment 6 of the present invention.

FIG. 14 is a longitudinal sectional view of a power generator according to Embodiment 6 of the present invention.

FIG. 15 is a longitudinal sectional view showing a power generator according to another embodiment.

FIG. 16 is a longitudinal sectional view of an electronic timepiece including the power generating device of the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoelectric element 2 Housing 3 Watch case 11 First thermoelectric element substrate 12 Second thermoelectric element substrate 13 Thermoelectric element 14a, 14b Terminal 21 First substrate 22 Second substrate 25, 26 Side plate 25a, 25b Step 27 Fluid 28 Flexible board 29 Holding member 32 Watch movement 100, 100A to 100G Power generator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-46249 (JP, A) JP-A-3-99213 (JP, A) Fully open 60-77295 (JP, U) Fully open 61 109161 (JP, U) Fully open Sho 61-254082 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G04C 10/00-10/04 G04G 1/00 H02N 1/00- 15/04 H01L 35/00-37/04

Claims (5)

(57) [Claims] A plurality of n-type and p-type first thermoelectric element substrates having heat conductivity and insulation and a second thermoelectric element substrate provided with a pair of terminals for extracting electromotive force and provided with heat transfer and insulation are provided. A thermoelectric element formed by a temperature difference between the first thermoelectric element substrate and the second thermoelectric element substrate, wherein the thermoelectric elements are alternately connected in series and both ends are respectively connected to the pair of terminal portions. A thermoelectric element that generates power by a thermal gradient in the element, and a first substrate having heat conductivity and a second substrate having heat conductivity are formed at predetermined intervals via a heat-insulating side plate. And a plurality of the thermoelectric elements are disposed in the housing,
The second thermoelectric element substrates are respectively fixed on the second substrate, and the first thermoelectric element substrates of the respective thermoelectric elements are in heat transfer contact with the first substrate via a fluid having heat conductivity. And the thermoelectric element is connected in series via each of the pair of terminal portions. 2. The printed circuit board according to claim 1, further comprising: a printed circuit board having a wiring that is in close contact with the pair of terminals of each of the thermoelectric elements and connects the thermoelectric elements in series, and between the printed board and the first substrate. A pressurizing member which is disposed on the printed circuit board so as to closely contact the printed circuit board with the terminal portion and has a heat insulating property. 3. The housing according to claim 1, wherein the outer shape of the housing has a columnar shape, a ring shape, or an arc shape, and the thermoelectric elements are arranged in a circumferential direction such that the terminal portions face inward. A power generating device, wherein the power generating device is arranged in a power generator. 4. The power generation device according to claim 1, wherein the housing has a rectangular parallelepiped appearance, and the thermoelectric elements are arranged to face each other such that the terminals face each other. apparatus. 5. A power generator comprising: the power generator according to claim 1; and a timepiece movement that is operated by electric power supplied from the power generator. An electronic timepiece which is housed in a watch case such that power is generated using body temperature as a high heat source and outside air temperature as a low heat source.