JPS6143258Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an anti-magnetic structure for a quartz watch.

As shown in FIG. 1, the antimagnetic structure of conventional quartz watches has been made of pure iron, with a lower dial plate 1 on the dial side and a back frame 2 on the back cover side. These were no longer attached to the movement side, and were primarily fixed or fixed by engagement with exterior parts. However, using exterior parts is expensive and tends to result in a very complicated structure, especially with a large composite thickness. This increase in the thickness of the crystal was a huge disadvantage in meeting consumer demands, and was a major barrier to achieving thinner crystal watches. Therefore, on the movement side, we focused on increasing the anti-magnetic performance of the motor itself, but there were limits to this, and in order to meet the anti-magnetic standards, a certain degree of anti-magnetic structure was required.

In order to make the movement as thin as possible, the antimagnetic member must be constructed using space within the same thickness as other movement components, such as coils, circuits, batteries, gear trains, etc.

As described above, the present invention provides an anti-magnetic structure that can ensure sufficient anti-magnetic properties even in a thin crystal watch. A detailed explanation will be given below with reference to the drawings.

2 and 3 show a plan view and a sectional view of the present invention. In a thin crystal watch, the movement thickness is designed to be about 2 to 3 mm, and in order to maintain conventional motor performance, the outer diameter of the coil is about 3 mm, which is close to the total thickness of the movement. Therefore, a coil relief hole 5a is provided in the base plate of the coil portion. In the present invention, an anti-magnetic structure is provided using the R portion of the coil.

The coil 6 is constructed around a magnetic core 7, and has rounded portions 6a, 6b, 6c, and 6d.
A shield member 3 and a shield member 4 are arranged using the R portion. The shield member 3 is located on the back cover side of the movement, and as shown in Fig. 3, it is bent down to the side from a position close to the R part of the coil and is arranged almost parallel to the coil, and is fixed. . Moreover, the shield member 3 has a coil escape hole 3a. The shield member 4 is
It is located on the main plate side of the movement, almost parallel to the coil 6, is bent so as to cover the side surface of the coil, and is fixed to the main plate 5 by welding or a bolt (not shown). The shield members 3 and 4 are constructed using three of the four R sections of the coil 6, and the remaining R sections are used for purposes other than antimagnetic functions. In the present invention, as shown in FIG. 3, a date indicator 8 and a date indicator 11 are arranged. Utilizing the three R portions of the coil has a significant effect on magnetic resistance. This is because if only the shield member 3 were used, external magnetism would flow equally through the shield member 3 and the magnetic core 7 and the magnetic core would be saturated, but if the shield member 3 and the shield member 4 By making the cross-sectional area of the shield member 3 and the cross-sectional area of the shield member 4, which are formed by the plane area and the plane perpendicular to the coil 6, almost equal, the amount of external magnetism passing through the magnetic core 7 can be reduced to about 1/3. , improve the movement's anti-magnetic properties.

The shield member 4 also has the effect of sealing off chips in through screw holes, such as the movement fixing screw hole 5b and the dial fixing screw hole, which are drilled in the main plate 5. This can reduce problems such as jamming caused by chips.

Next, due to the relationship between the back side and the front side of the main plate 5, a notch is created in the outer shape of the main plate.
If the date indicator 8 etc. protrudes from the main plate 5, during assembly or
When checking the date adjustment function, the function may not be confirmed because the date wheel is pressed down. However, since at least a part of the shield member 4 constitutes a part of the outer shape of the main plate, it can be used without pressing the date wheel 8 etc. You can check its functionality.

As described above, in the case where the movement is thin and the base plate of the coil portion is cut out and the coil is installed in the through hole bright part 5a, the shield member 4 is bent from the back side of the base plate to the front side. Moreover, since the main plate 5 is extended in cross section from the total thickness, it is possible to prevent the rotation of the mechanical pawl 10 for fixing the movement. As a result, there is no need to attach a rotation stopper pin, a rotation stopper plate, etc., so a simple and low-cost mechanical stopper claw structure can be achieved. Furthermore, by providing the shield member 3 with a protrusion 3b as shown in FIG. 4, mechanical fixing has been performed using a mechanical locking pawl 10, but this can be done directly with the shield member. The number of parts is reduced. Furthermore, since the mechanical pawl 10 is a very small and difficult-to-handle component, eliminating it will greatly reduce the number of assembly steps. By minimizing the planar overlap between the shield member 3 and the shield member 4, and concentrating on the areas near the stator, magnetic core, and coil parts, which have the weakest magnetic resistance, and widening the area covered by both shield members, the conventional It is possible to achieve the same effect as a back frame and dial bottom plate, and eliminate the need for unnecessary anti-magnetic members. Therefore, the number of parts and cost can be reduced without reducing magnetic resistance.

[Brief explanation of drawings]

FIG. 1...A sectional view of a conventional method. FIG. 2: A plan view of an embodiment of the present invention. FIG. 3...A sectional view of an embodiment of the present invention. FIG. 4: A plan view of another embodiment. 3, 4... Shield member, 5... Main plate, 6...
Coil, 7...Magnetic core, 8...Date indicator, 10...Mechanical stopper claw, 11...Date indicator.

Claims (1)

[Scope of utility model registration request] In the antimagnetic structure of a quartz watch that is driven by a motor having a cylindrical drive coil whose coil core is arranged parallel to the main plate surface, the drive coil is inserted into a through hole provided in the main plate. At the same time, two magnetic shielding plates are arranged around the drive coil, one of the magnetic shielding plates being fixed to the back cover side of the main plate, and a part of the magnetic shielding plate facing the R part of the drive coil. A hole and a bent portion along the outer periphery of the coil are provided, and the other of the magnetic shielding plates is fixed to the side opposite to the back cover side of the main plate, and at least a part of the plate is connected to the through-hole bright part of the main plate. An antimagnetic structure for a quartz watch, characterized in that the antimagnetic structure of a crystal watch is configured such that the antimagnetic plate passes through the base plate and approaches the bent portion of the antimagnetic plate disposed on the back cover side of the main plate.