JPH0421119Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of an electronic timepiece using a wave motor.

[Summary of the idea]

In an electronic watch using a wave motor, a screw groove is formed on the inner periphery of the annular rotor and engaged with a screw groove formed on the outer periphery of the cylindrical support member, thereby controlling the rotation of the rotor and this rotation. The time is displayed by the vertical movement of the wave motor.

[Conventional technology]

Conventional electronic analog watches generally use an electromagnetic step motor as a drive source to drive a plurality of hands and the like via a reduction gear train to display the time. Recently, electronic clocks using wave motors have also been proposed, but these are
As shown in the figure, the drive source is the motor,
It consisted of a wheel train means for transmitting the rotation of the motor, and a pointer rotated by the wheel train.

[Problem that the invention attempts to solve]

As mentioned above, the structure of a conventional electronic watch consists of a motor as a driving source, a wheel train that transmits the rotation of the motor, and a pointer that is rotated by the wheel train. There were problems in that the number of parts was increased due to the supporting member and the pointer, and the assembly was complicated. Regarding time display means, there are some variations in design, such as coaxial needle axes, different positions, and disc hands, but basically the hands are rotated in a plane. The form remained unchanged.

Therefore, in order to solve the above-mentioned problems, the purpose of this invention is to utilize the high-torque, low-speed rotation characteristics of a wave motor to obtain an electronic timepiece with a small number of parts, a simple structure, and a new display means. It is in.

[Means for solving problems]

In order to solve the above problems, the present invention provides an electronic watch using a wave motor in which a threaded groove is formed on the inner periphery of the annular rotor and engaged with a threaded groove formed on the outer periphery of the cylindrical support member. supported by,
Further, the annular stator is pressed against the rotor, and is supported in such a manner that it cannot rotate relative to the cylindrical support member. This allows the time to be displayed based on the rotation of the rotor and the amount of vertical movement of the wave motor accompanying this rotation.

[Effect]

In the electronic timepiece configured as described above, by applying an electrical signal to the stator, the stator generates a mechanical traveling wave, and the rotor, which is pressed against the stator, rotates in the circumferential direction due to frictional force. . The rotor has a threaded groove on the inner circumference that engages with a threaded groove on the outer circumference of the cylindrical support member.
As it rotates, it also moves up and down along the thread groove. On the other hand, the stator moves up and down with the rotor while being in pressure contact with the rotor, but does not rotate relative to the cylindrical support member. Therefore, by providing a time display scale on the outer periphery of the cylindrical support member, rotor, and stator, the amount of movement in the rotational direction and the vertical direction can be read, and the time can be displayed.

When the rotor moves vertically along the thread groove, a fairly high torque is required, but since wave motors are driven by frictional force, high torque can be achieved by appropriately selecting the pressurization between the rotor and stator. Therefore, the characteristics of a wave motor can be utilized in terms of both shape and performance.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. In FIGS. 1 and 2, the rotor support shaft 1 has a cylindrical shape and has a threaded groove 1a formed on its outer periphery. The rotor 2 has an annular shape, and a threaded groove 2a formed on the inner circumference engages with a threaded groove 1a of the rotor support shaft 1. The stator 3 has an annular shape and is stacked on the rotor 2, and is attracted by a magnet 4 embedded inside the rotor 2, so that the rotor 2 and the stator 3 are pressed against each other. The stator cover 5 has a shape that covers the top and side surfaces of the stator 3, and is bonded to the stator 3 via a stator support plate 6 made of an elastic material. A flat portion 1b parallel to the longitudinal direction is provided on the outer periphery of the rotor support shaft 1, and a dividing groove 1c is provided in a direction perpendicular to the flat portion 1b. The stator cover 5 is provided with a straight part 5a along the flat part 1b of the rotor support shaft 1 and a protrusion 5b that fits into the groove 1c of the rotor support shaft 1 on a part of the inner circumference, so that the stator 3 can be attached to the rotor support shaft. It is set so that it cannot be rotated relative to 1. A piezoelectric element 3a is adhered to the upper surface of the stator 3, and is electrically connected to a circuit block 9 via a lead wire 7 and a flexible substrate 8. The flexible substrate 8 has one end glued to the protrusion 5b of the stator cover 5, is freely bent within the slot 1c of the rotor support shaft 1 and extends downward, and the other end is crimped to the circuit block 9 in a conductive state. . Further, as shown in FIG. 3, a position detection board 10 is adhered to one wall surface of the groove 1c of the rotor support shaft 1, and its lower end is crimped to the circuit block 9 in a state where it can be electrically connected. The stator cover 5 and the flexible substrate 8 have vertical bent portions 5c and 8, respectively.
The flexible substrate 8 and the position detection substrate 10 have electrode patterns formed on opposing surfaces thereof.
The circuit case 11 houses the circuit block 9 and the battery 12, and supports the rotor support shaft 1 above.
The back cover 13 is detachably supported by the circuit case 11 so that the battery 12 can be easily replaced. The case 13 covers and protects the drive unit with a transparent material. FIG. 4 shows an external view, in which an hour scale 1d is provided in the vertical direction on the flat part 1b of the rotor support shaft 1, a minute scale 2b is provided on the outer peripheral side of the rotor 2,
A guide mark 5d is provided on the side surface of the stator cover 5.

Next, to explain the operation, an electric signal generated in the circuit block 9 is transmitted to the piezoelectric element 3a via the flexible substrate 8 and the lead wire 7, and the stator 3
generates a mechanical traveling wave. As a result, the rotor 2 pressed against the stator 3 rotates, for example, counterclockwise due to the frictional force, and simultaneously moves upward along the thread groove (in the case of a thread groove or a right-hand thread). The stator 3 includes a straight portion 5a and a protruding portion 5b of a stator cover 5, a flat portion 1b of a rotor support shaft 1, and a split groove 1.
Since the rotor 3 is engaged with the rotor 3, it can move in the vertical direction together with the rotor 3 without rotating. When the rotor 2 rotates, the minute scale 2b provided on the rotor 2 moves relative to the reference mark 5d provided on the stator cover 5, and the minute can be displayed depending on the relative position thereof.
Furthermore, since the rotor 2 and stator 3 move upward, the hour can be displayed by the relative position of the upper end of the stator cover 5, for example, with respect to the hour scale 1d provided on the flat surface 1b of the rotor support shaft 1.

When the rotor 2 rotates and moves upward, the bent portion 8a of the flexible substrate 8 also moves, changing its relative position with the position detection substrate 10. By interpreting this as a change in capacitance between the electrode patterns, the rotor 2 position detection in the vertical direction is possible. When the rotor 2 reaches the top end, the rotor 2 is rotated clockwise at high speed, moved to the bottom end in a short time, and then rotated counterclockwise again to repeat the time display.

In the embodiment shown in FIGS. 1 to 4, the stator 3 is stacked on the rotor 2, but the same effect can be obtained even if the rotor 2 is stacked on the stator 3. Furthermore, although the rotor support shaft 1 is arranged vertically and the hours are displayed on the top and bottom, it is also possible to arrange the rotor support shaft horizontally and display the hours on the left and right sides. Furthermore, although minutes are displayed in the rotational direction of the rotor 2 and hours are displayed in the vertical direction, this may be replaced by seconds in the rotational direction and minutes in the vertical direction.

[Effect of idea]

As explained above, by using a wave motor, the present invention can display the time using only the rotor, stator, and support members that are the components of the motor, and does not require a wheel train or a pointer like in the past. In addition to minimizing the number of parts, the structure is simple and assembly is easy. Furthermore, since the time is displayed by a combination of rotor rotation and vertical movement, it is possible to display a new three-dimensional time display that cannot be expressed using the conventional flat needle display method.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the invention, Fig. 2 is a plan view showing an embodiment of the invention, Fig. 3 is a partial sectional view showing an embodiment of the invention, and Fig. 4 is a partial sectional view showing an embodiment of the invention. It is an external front view showing an example. 1... Rotor support shaft, 2... Rotor, 3... Stator, 4... Magnet, 5... Stator cover, 6
... Stator support plate, 7 ... Lead wire, 8 ... Flexible board, 9 ... Circuit block, 10 ...
Position detection board, 11... circuit case, 12... battery, 13... back cover, 14... case.

Claims (1)

[Scope of utility model registration request] A rotor support shaft having a cylindrical or cylindrical shape with a threaded groove formed on its outer periphery and a time display scale provided on a part of the outer periphery, and a threaded groove formed on its inner periphery, the threaded groove being the same as the threaded groove of the rotor supporting shaft. A wave motor is provided, which has an annular rotor that is engaged with each other and has a time display scale provided on its outer periphery, and an annular stator that is in pressure contact with each other and is supported in a non-rotatable manner with respect to the rotor support shaft. The electronic clock used.