JP2000111666A - Case for heat power generation type wristwatch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively radiate heat from a heat power generation element. SOLUTION: Fins 4 having an air vent 5 in the base end part are arranged at a regular interval from the upper surface of a trunk main body 2 on the trunk main body 2 connected to the heat radiating part of a heat power generation element to be extendedly formed in its slant attitude so that the windshield 7 side becomes the upper side, and heat of these parts is efficiently radiated by convection introduced by the fins 4 together with heat radiation from the fins 4 themselves by introducing outside air trying to rise from the trunk main body 2 to the air vents 5 by these fins 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for a thermoelectric wristwatch in which electric energy is obtained by utilizing a difference between a user's body temperature and an outside air temperature.

[0002]

2. Description of the Related Art Thermoelectric wristwatches that use the difference between the user's body temperature and the outside air temperature to obtain the electrical energy required to drive the movement have already been developed.
This is disclosed in Japanese Patent Application Laid-Open No. 8-194,074.

[0003] The thermoelectric generator used in this type of wristwatch obtains the required electrical energy from the difference between the user's body temperature and the outside air temperature. Considering that the user's body temperature is almost constant. However, how to release a large amount of heat to the outside is an important issue in determining power generation efficiency.

[0004] From such a viewpoint, a space for accommodating a liquid is provided between the body and the bezel in the watch case disclosed in the above publication, and the latent heat of vaporization of the accommodated liquid is used to dispose the case on the heat radiation side. Although it is designed to cool half of the case, such a structure not only complicates the structure of the watch case, but also creates dust and red However, there is an inconvenience that the liquid is clogged or the inflow operation of the liquid is troublesome and may be abandoned.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
An object of the present invention is to provide a new thermoelectric wristwatch case that does not require any manpower, and that can enhance the heat radiation effect of the thermoelectric element to the maximum.

[0006]

That is, the present invention provides a thermoelectric wristwatch case for achieving the above object, which is provided on a heat radiation side body of a wristwatch case which is in contact with a heat radiation portion of a thermoelectric element. The fins provided with the ventilation holes are formed so as to extend at a slight distance from the upper surface of the trunk main body and to extend obliquely integrally with the windshield side facing upward.

[0007]

With this construction, the outside air which is going to rise from the body of the body is directed obliquely upward toward the ventilation holes, so that the heat is efficiently dissipated by the convection guided by the fins together with the heat radiation from the fins themselves. Release.

[0008]

Embodiments of the present invention will be described below. 1 to 3 show an embodiment of the present invention configured as a case of a thermoelectric wristwatch.

The wristwatch case 1 has a body 2 as a member on the heat dissipation side formed of a metal having good heat conductivity, for example, stainless steel, and a metal having good heat conductivity, for example, stainless steel. And a heat shield member 8 made of plastics having excellent heat insulating properties interposed therebetween.

A movement 13 is incorporated in the body 2 together with the dial 11 and the hands 12, and a thermoelectric element 14 is sandwiched between the body 2 and the back cover 6.
By bringing the heat absorbing side into close contact with the back cover 6 and bringing the heat radiating side into close contact with the trunk body 2 via the heat radiating plate 15, electric energy required for driving the movement 13 between the heat absorbing side and the heat radiating side is provided. It is configured to generate a temperature difference for removal.

The surface of the body 2 is formed as a mirror surface polished so that heat can be efficiently released.
On the side of the can 2a, that is, on the side of the joint portion of the watch band, overhangs 3, 3 covering this portion are formed in a state of being obliquely inclined. A fin 4 is integrally formed so as to cover the projecting portion 3 by providing δ.
A vent hole 5 having an arc shape is formed at the base end of the windshield 7 so as to be along the periphery of the windshield 7. The fins 4 themselves are configured to provide a cooling function as cooling fins while generating an airflow that flows out of the ventilation holes 5 together with the outside air sucked from the fins and cooling the overhang portion 3 by the convection.

When the wristwatch constructed as described above is worn on the wrist, the body temperature of the user enters the heat-absorbing side of the thermoelectric generator 14 from the back cover 6 and further to the body 2 from the heat-radiating side via the heat-radiating plate 15. leak.

On the other hand, part of the heat flowing into the body 2 is
The polished surface efficiently discharges the heat to the outside, and the remaining heat flows to the overhanging portions 3 and the fins 4 formed as large as possible on the discharge surface, and as shown by arrows in FIG. Then, the outside air that is to be heated and raised by touching these surfaces is changed to convection flowing out to the ventilation hole 5 together with the outside air taken in from the gap at the end of the can portion 2a side, and the airflow efficiently cools these parts. .

The embodiment shown in FIG. 4 shows a bezel 2 for supporting a windshield on a body of a body through a silicone resin having good thermal conductivity.
9 are integrally formed, and fins 24 are integrally formed on the 6 o'clock side and 12 o'clock side of the bezel 29 to cover the projecting portion of the trunk main body. Several parallel ribs 24a # protrude toward the end ventilation holes 25 to provide a rectifying effect on the outside air flowing over the overhanging portion. Are provided with several grooves 24b # to further increase the surface area for heat dissipation.

The embodiment shown in FIG.
The fins 34 formed on both sides are formed in a net 34a shape to provide a function of guiding outside air flowing between the fins 34 and the body and an efficient heat radiation function.

FIGS. 6 and 7 show still another embodiment of the present invention. In this embodiment, a bezel 49 for holding a windshield 47 is rotatably or integrally provided on an upper portion of a trunk main body 42 through a thermally conductive silicone resin, and an outer peripheral surface of the bezel 49 is provided on the outer peripheral surface of the bezel 49. A ring-shaped fin 44 whose surface is matted so as to be slightly spaced from the upper surface of the upper surface 42 is formed integrally obliquely with the windshield 47 side facing up. Is provided with a number of ventilation holes 45 ‥
‥ is provided to discharge the outside air flowing along the moving body 42.

In this embodiment, the ring-shaped fins 44 are integrally provided on the entire periphery of the bezel 49. With this configuration, the body 42 and the fins 4 are provided.
In addition to eliminating the undercut portion formed between the main body 4 and the fin 44, the fins 44 covering the upper surface of the main body 42 allow the outside air to rise from the entire surface of the main body 42 to the outside. By guiding the air through the gap to the air hole 45 ° together with the outside air taken in from the peripheral edge, an airflow is generated between the entire surface of the body 42 and the entire lower surface of the fins 44, thereby efficiently cooling the entire body as a heat radiating portion. can do.

[0018]

As described above, according to the present invention, the fin provided with the ventilation hole extends obliquely on the heat radiation side body of the watch case so as to provide a space between the body and the upper surface. As it was formed, the fins forced the outside air that was going to rise due to the heat from the trunk body into the ventilation holes,
At this time, the heat generated on the upper surface of the body and the fin surface by the convection can be efficiently released, and at the same time, the heat from the thermoelectric generator can be further effectively reduced by the fin having the heat transfer surface enlarged as much as possible. Can be released.

Furthermore, by providing the fins on the outer edge of the bezel, the undercut portion can be eliminated to facilitate the molding of the body, and furthermore, the surface of the body can be made a surface suitable for emitting radiant heat. By forming as a heat transfer, radiating action in addition to convection, heat is released from the thermoelectric generator more efficiently, and at the same time, by mirror finishing or satin finishing applied to the surface of the trunk body,
The appearance of the watch case can be further enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a wristwatch case showing one embodiment of the present invention.

FIG. 2 is a view showing a cross section of the watch case accommodating a movement and the like.

FIGS. 3 (a) and 3 (b) are side views of the wristwatch case as seen from the crown side and canister side, respectively.

FIG. 4 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 5 is a perspective view of a main part showing another embodiment.

FIG. 6 is an exploded perspective view of a wristwatch case showing still another embodiment.

FIGS. 7 (a) and 7 (b) are side views of the same watch case as seen from the crown side and the can side, respectively.

[Explanation of symbols]

 2, 42 trunk body 6 back lid 8 heat shielding member 9, 29, 39, 49 bezel 13 movement 14 thermoelectric generator

Claims (6)

[Claims] 1. A fin having a vent hole formed at a base end thereof on a heat radiation side body of a wristwatch case which comes into contact with a heat radiation part of a thermoelectric generator, and a slight gap is provided between the fin and the upper surface of the body. ,
A thermoelectric wristwatch case, which is integrally formed so as to extend obliquely with the windshield side facing upward. 2. The heat radiation side body has a surface formed as a surface suitable for emitting radiant heat.
The case for a thermoelectric watch described. 3. The thermoelectric wristwatch case according to claim 1, wherein a rectifying rib for flowing outside air from an outer edge toward the ventilation hole is formed on a back surface of the fin. 4. The thermoelectric wristwatch case according to claim 1, wherein said fins are integrally formed on the periphery of a bezel joined to said body. 5. A fin provided with a large number of ventilation holes all around the heat radiation side body of the watch case in contact with the heat radiating portion of the thermoelectric generator, a fin provided at a slight distance between the fin and the body. A thermoelectric wristwatch case, wherein the case is formed so as to extend obliquely and integrally with the windshield side facing upward. 6. The thermoelectric wristwatch case according to claim 5, wherein said fins are integrally formed on the entire peripheral surface of the bezel joined to the trunk body.