JPH0129306B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for replacing replacement parts in a holding mechanism for a battery part used in a suitable electronic product such as an electronic watch, or in a holding mechanism for a part in other suitable products that requires replacement of the part from time to time. The present invention relates to a replacement part holding device using a shape memory alloy for a holding tool.

Conventionally, when assembling a small component such as a button battery into a suitable electronic product such as an electronic watch, for example, as shown in FIG. and was holding part 1.

Therefore, in order to assemble the component 1 onto the board 4, you must either loosen the screw 3 and remove the holding tool 2 each time.
Alternatively, the presser 2 must be fixed by rotating the loosened presser 2 sideways to take in and take out the part 1, return the presser 2 to the set discharge position, and tighten the screw 3. It didn't happen. Therefore, requiring such a means to replace parts is extremely difficult to handle.

In addition, as shown in Fig. 2, there is a holding means that does not use fixing screws and allows the presser 2a to be moved to the horizontal position using the pivot portion 5 as a fulcrum, but in this case, the presser is returned to the set position. The distal end of 2a must be provided with an appropriate locking structure and the locking portion 2' must be engaged with the main body 4a, which is a cumbersome assembly process, and a locking structure for this purpose is required.

On the other hand, as a holding means that facilitates the attachment and detachment of replacement parts, there is a structure in which a presser 2b is brought into contact with the side surface of the part 1b, as shown in FIG. 3, for example.

However, since the top surface of the component remains open in such a structure, the component (for example, battery) 1b must be prevented from falling with a back cover or the like. For this reason, when moving and inspecting an electronic watch as a module, for example, the holding parts tend to come off, creating the inconvenience of having to set the time and mode all over again. The problem is that it is easy.

This invention has been made in view of the above-mentioned conventional example, and its gist is that a presser for holding a replacement part is made of a shape memory alloy, and the presser made of the shape memory alloy is, for example, a first Similar to the conventional configuration shown in the figure, one end of the presser is fixed to the board side with a screw, but the parts to be held can be held accurately by the elasticity of the presser at room temperature, and the presser can be left as is. The holding part can be easily removed or attached by heating it to a phase transition temperature while it is attached, or by applying external stress to the holding member at room temperature and causing it to warp in the direction of releasing the holding part.

Therefore, it is an object of the present invention to provide a holding device that allows the above-mentioned presser to automatically restore its shape memory state at room temperature without having to be specially restored after the part is attached, and that can accurately hold the replacement part. be.

Next, the present invention will be explained based on embodiments shown in the drawings. The shape memory alloy used in the following examples is a plate material made of, for example, titanium and nickel, and the temperature at which the shape memory phase transition occurs is set to -10° C. or lower. For this reason, this shape memory alloy naturally exhibits a shape memory effect at room temperature, and produces a superelastic phenomenon in which it immediately returns to its original memorized shape when an external force is removed.

In FIG. 4a, a bending part 11 is provided at one end of a presser 10 made of a shape memory alloy having the above-mentioned phase transition temperature characteristics, and its base end 10a is fixed to a substrate 13 with a screw 12, and a component (for example, a battery) is can be held integrally with the substrate 13. Note that 15 is the other conductive piece disposed within the component storage section 17 of the main body 16.

In the above, the holding tool 10 has a free end 10b, and has a memorized shape of a shape memory alloy, and at room temperature, the holding tool 10 is pressed against the upper surface of the component 14 with the elasticity that returns to the memorized shape as shown in the figure.

Therefore, the component 14 is in electrical contact with the presser 10 due to the elasticity of the presser 10, and the component 14 is held by the presser 10 without falling off.

FIG. 4b shows a state in which the parts 14 shown in the above embodiment are replaced.
Lift 0b in the holding release direction (upward in the figure).
In this case, the presser 10 may be kept at room temperature by applying an external force to the tip 10b to lift it in the direction of release from holding, or the presser 10 may be heated to a low temperature below the phase transition temperature (-10°C), for example, when the tip 10b is liquefied. If the presser 10 is cooled by blowing gas or the like onto it, a phase transition will occur in the presser 10 and the presser 10 will be cooled down.
0 can be softened, the presser 10 can be easily deformed, and the parts 14 can be easily replaced. Therefore, when the presser 10 is softened due to this phase transition, the part 1 is softened until it gradually returns to its shape memory state.
The exchange can be easily done by performing the exchange described in step 4.
If the presser 10 is left as is after replacing the part 14, the presser 10 will exceed the phase transition temperature and return to the shape memory state in the process of returning to room temperature.
The part 14 can be automatically held and accurately restored to the held state.

Next, a presser 10 using the holding device of the present invention will be described.
A case will be explained in which the phase transition of the shape memory alloy constituting the is set at a temperature of 60° C. or higher. Note that the embodiment will be explained using those shown in FIGS. 4a and 4b.

In this case, the presser 10 has a shape memory state stored in the shape of the holding released state, for example, as shown in FIG. 4b. Then, when assembling the component 14 in a predetermined position, the presser 10 is heated by using hot air or a heater.
The part 14 is returned to a so-called shape memory state, and the part 14 is set in a predetermined position by releasing the holding in this state. Next, in response to the temperature of the presser 10 dropping to room temperature, as shown in FIG. The part 14 is held by holding the part 14. In this case, if the component 14 is, for example, a battery for an electronic watch, it is recommended to use a configuration in which the presser 10 is auxiliary pressed in the holding direction with the back cover of the container, etc., in order to improve reliability. desirable.

Further, in the above, the shape memory alloy forming the presser 10 may be formed using a shape memory alloy having a reversible shape effect. This reversible shape effect is a phenomenon in which when a shape memory alloy reaches a temperature above its phase transition temperature, the shape memory alloy returns to its memorized shape, and conversely, when it is cooled, it returns to its plastically deformed state. .

Therefore, if the presser 10 is made of a shape memory alloy having such a reversible shape effect, the holding of the presser 10 can be released by raising the temperature, and the component 14 can be held by cooling the presser 10 to room temperature. The parts 14 can be used appropriately, and the parts 14 can be replaced simply by controlling the temperature.

The embodiment shown in FIG. 5 is a case where the bent portion 11a of the presser 10 is curved away from the component 14, and by configuring the presser 10 in this way, the presser 10 can be heated with a heater or the like. This eliminates the inconvenience of unnecessarily heating the component 14 when heating.

The embodiment shown in FIG.
8a are provided as a pair, and the material is the same shape memory alloy as in the previous embodiment. Note that only one of the pressers 18, 18a may be made of a shape memory alloy.

In this case, the presser 18 made of shape memory alloy
(or 18a), it is possible to release and hold the component 14 in the same way as in the previous embodiment. Incidentally, when only one presser is made of a shape memory alloy, there is an advantage that the material cost can be saved.

In the embodiment shown in FIG. 7, a shape memory alloy 20 is used for a portion of the presser 19.
Therefore, according to this embodiment, the presser 19 can be constructed using the shape memory alloy only in the portion of the presser 19 that is essentially desired to be deformed, so that the material cost of the shape memory alloy can be saved as described above. Ru. In addition, 1
9' is a spot welded portion.

The embodiment shown in FIG. 8 has a thin film 2 of a good conductor with low electrical contact resistance on one side (or both sides are possible if necessary) of a presser 21 made of a shape memory alloy.
2 is provided in multiple layers by adhesion, plating, or other appropriate means.

Therefore, according to this embodiment, when the presser 21 is brought into contact with the printed surface of the board 13 using an electric circuit and fixed with the screws 12, the electric circuit between the presser 21 and the board 13, And good electrical connection with the replacement part 14 can be maintained.

Note that the method of using the presser 21 is the same as in the other embodiments.

Since the present invention is as described above, replacement parts, such as batteries or liquid crystal panels used in electronic clocks, games with electronic clocks, cameras and other products with appropriate electronic functions, can be easily manufactured. It can be exchanged and maintained.

Further, according to the present invention, it is extremely convenient to hold parts that need to be replaced, such as fuses and pilot lamps used in the above-mentioned other electric circuits, and the effect in use is great. Of course, the holding of the above-mentioned parts is not limited to those used in electric circuits, and the same effect can be applied to, for example, a holding mechanism for a filter used in a filter or the like.

Therefore, the present invention has an extremely simple structure and can be used to replace an existing structure with a shape memory alloy presser that can be configured into a similar shape. The product also has the advantage that it can be easily replaced with the holding device of the present invention and suitable improvements can be made.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of a conventional component holding mechanism, and FIGS. 2 and 3 are explanatory diagrams of other examples of the conventional component holding mechanism. Fig. 4a is an explanatory diagram showing an example of the embodiment of the present invention, Fig. 4b is an explanatory diagram of the operation of the presser shown in Fig. 4a, and Figs. 5 to 8 respectively show other examples of the presser. FIG. 10, 18, 18a, 19, 21...presser,
14...Parts, 22...Thin film.

Claims (1)

[Scope of Claims] 1. In a structure in which the replacement part is held by a presser, the presser for holding the replacement part is made of a shape memory alloy, and the replacement part has a shape memory alloy that has a phase change of the shape memory alloy at room temperature. A holding device for replacement parts configured to be able to be held under pressure by elasticity during transition. 2. The replacement part holding device according to claim 1, wherein the holding tool is made of a shape memory alloy, and a thin film of a good conductor is provided on the surface of the shape memory alloy.