DE2166739A1 - Quartz-oscillator wrist watch - has frequency divider cct. and stepping motor - Google Patents

Abstract

The stepping motor has a magnetic pole rotor, which itself acts as part of the drive train for the time display means, and a yoke which is made from a high-permeability magnetic material, forming two stator parts surrounding the rotor. The drive coil for the motor is located to one side of the rotor axis, with the two parts of the yoke gripping either end of the coil. Pref. a battery is contained within the housing of the encapsulated vibrator the oscillator and divider circuit and the drive circuit. Pref. the setting shaft is located at the three o'clock position, with the battery at the twelve o'clock position.

Description

Quartz crystal wrist watch

The invention relates to a quartz crystal wrist watch with a Quartz crystal vibrator as a time standard, a divider circuit for dividing the vibrator signal into a low frequency one Signal to drive a stepper motor consisting of a drive coil, a yoke and a pole wheel to drive a pointer gear train.

There has long been a need for wristwatches that are as small as possible. The clocks should be in particular be of flat design and also within a round housing design, as required on the market, can be accommodated.

It is the object of the invention, in a wristwatch, of the type mentioned at the beginning Way of meeting those needs.

This is achieved according to the invention in that the pole wheel of the The stepper motor itself is designed as part of the gear train and is directly integrated into it and that it is made of high permeability Material existing yoke from the stator parts assigned to the pole wheel to the opposite of the pole wheel axis laterally offset arranged coil runs and extends through this.

With this embodiment of the stepper motor according to the invention achieved that the pole wheel - that is, the rotor of the stepper motor spatially can be assigned very closely to the gear train without

509841/0389

Dipl.-Ing. Heinz Lesser. Dipl -Ing. Otto wing. Patent Attorneys - D-8 Munich 81. CosimastraBe 81

that the more voluminous drive coil stands in the way; this is rather arranged laterally offset, what a flat Training the clock comes towards you.

Such an engine creates, among other things, the prerequisites for that the space requirements of a clock with rounded edges can be used in an optimal manner. Preferably dis Arrangement made such that around the approximately centric in Area of the round clock range arranged gear train as a first unit around a battery as a second unit, as third unit within a housing the vibrator, an oscillating resonant circuit, the divider circuit and a, Driver circuit and the fourth unit, the drive coil of the stepping motor are arranged. Seen more concretely, it can be proceeded in such a way that an adjustment shaft in the area the three o'clock display and the battery in the area of the Twelve o'clock display of the clock are arranged, while the structural unit of the vibrator with its downstream electronic Circuit units of the structural unit of the Batterie.benchbart is arranged and the drive coil of the stepping motor between this latter structural unit and the adjustment shaft in the edge area the clock's round circuit board.

By combining the electronic circuit units and the vibrator in one structural unit, it is possible to the necessary contact connections to the battery as Source of the drive energy and the coil as the receiver of the immediate The output signal of this unit used for the mechanical drive saves space and is easy to maintain be arranged know. In a preferred manner, therefore, a Group of connections for input and output signals of the oscillator circuit from the vibrator and dBm downstream from it electronic circuit units, connections of the vibrator itself and a supply connection of the battery to the

509841/0389 ^{ORIQINAL BATHROOM}

2166733

Dipl.-Ing. Heinz Lesser. Dipl.-Ing. Otto wing. Patent Attorneys · D-8 Munich 81 Cosimastraßs 6I

Assembly of the side facing the battery as a third assembly trained housing are, while on the opposite side of the output connections for the motor drive are provided.

A particularly space-saving design of the downstream vibrator electronic circuit units is achieved when the oscillator circuit and divider circuit are below Use of metal oxide transistors (MQS) and the driver circuit in integrated circuit technology (IC). The relevant structural unit can then also have a temperature compensation circuit and / or a frequency adjustment device can be assigned.

The invention is illustrated schematically with the aid of the drawing reproduced embodiment explained in more detail below.

Show it:

Fig. 1 is a plan view of the embodiment

Fig. 2 is an enlarged view of a partial section perpendicular to the circuit board level of the embodiment.

As the exemplary embodiment shows, the battery is round, and the vibrator is in a cylindrical enclosure. The stepper motor is under consideration the efficiency of this electro-mechanical converter provided with a relatively large cylindrical coil, which takes up a lot of space in the available, rounded clockwork room and above also has a not inconsiderable thickness, so that it is no longer possible to use other components in the direction of the thickness

S09841 / 0389 bad original

Dipl.-Ing. Heinz Lesser. Dipl-ing. Otto Fluge! Patent Attorneys D-8 Munich 81. Cosimastraße 81

to arrange the clock above or below the drive coil. Something like that applies to the battery and the cylindrical enclosure of the vibrator. Furthermore, the vibrator as a time standard and the electronic circuit units assigned to it, lines for the supply of electrical energy and for the delivery of the electrical output signal. The simple and space-saving arrangement of each of these lines and their connections is important for the interior design of the electric clock.

On a round plate 25 of the clock of the exemplary embodiment there is a shaft 24 for the display correction approximately in the area of the three o'clock display. The battery 26 is located in the area of the twelve o'clock display, whereby the battery is covered. A connection plate 27 is connected to the negative pole of the battery. A housing B accommodates the vibrator and the electronic circuits assigned to it and is designed as a structural unit. As can be seen in particular from FIG. 2, the cylindrical encapsulation 9 of the vibrator is accommodated in a recess in the housing 8. A fine adjustment device 13 to 16 for. the frequency contains a step-adjustable capacitor and a temperature compensation element 11, which in turn is provided with a BaTiO ₃ capacitor. The electronic circuits 17 are completely embedded in a cavity of the housing B. With 18 a to 18 e input and output connections for electrical signals of the electronic circuits are designated, the connections 18 a for the signal for driving the pulse motor and a ground ^ connection 1B b on the left side of the housing B (side of the Drive coil) are arranged, while connection connections 18 c for the oscillator circuit, a connection 18 d for connection to the battery and a reset connection 18 e are located on the right side of the housing (battery side). With 10 electrical signal and output connections of the vibrator are designated, which is designed as a tuning fork crystal oscillator. The connections 10 are located

509841/0389

Dipl.-Ing. Hsinz Lessor. Dip! -! Ng. OUo wing. Patent Attorneys D-8 Munich 81. Cosimastraße 81

on the same side as the connections 1Ö c, which means provides a short and simple connection to the electronic circuitry of the oscillator circuit. Connect the connections 12 the step-by-step switchable capacitor with the BaTiOo " Capacitor. With 28 a to 28 c is designed as a stepper motor electromechanical transducer, which converts the electrical output signal of the electrical circuits in rotational movements of the gear train implemented. The drive coil 28 a of this pulse motor is approximately cylindrical; on their A core made of magnetic material is about 15,000 turns Coiled copper wire with a diameter of 2.5 / 100 mm.

The switching pulse current occurring every second flows controlled by the driver circuit through the drive coil of the pulse motor. The magnetic generated in the coil as a result Field acts in the stator parts 28 b and 28 c, whereby the rotor 29 rotates through a predetermined angle. The rotor 29 is made of a PtCO material and equipped with six magnetic poles alternating as north and south poles. The rotational movement of the rotor 29 is initially on fourth wheel 30, then passed on to a third wheel and to a central wheel. A second hand connector 31 is associated with the fourth wheel 30 to indicate the position of the second hand. One end of a regulating lever 32 for the The second hand grips one end of the adjustment shaft while the other end of this lever with one end of the connector 31 is put together. The one not shown in this respect Reset mechanism, which is arranged near the adjustment shaft has a switching mechanism that cooperates with a crown and with a regulating lever. With the help of this Switching mechanism, part of the divider circuit can be switched off so that the output signal of the divider disappears.

The vibrator is a tuning fork oscillating crystal with a Oscillator frequency above 16 kHz. The tuning fork

509841/0389

Dipl.-Ing. Heinz Lesser. Dip! -Ing. Otto wing. Patent Attorneys D-8 Munich 81. Cosimastraße 81

type was chosen because the leaf spring type is still possible takes up too much space. If one takes into account the necessary evaporation measures against impact influences from outside and if a frequency of 1 B-kHz is used as a basis, then the Leaf spring vibrator a length of 23 mm. Will this length If the value falls below this level, the vibrator is considerably reduced influenced by the suspension wire and is no longer suitable as a time standard for a wristwatch. If you pull over this one If a special type of attachment and a hermetically sealed accommodation are taken into account, then one arrives at a length of one corresponding vibrator encapsulation. of about 28 mm. Such a training is therefore not for compact and round clockworks suitable. If one assumes the same damping properties in relation to impact influences from outside, then for a tuning fork type vibrator only requires a length of 13 mm. If you protect the vibrator in the preferred embodiment in this way against disturbances from external shock loads and hermetically seals it off, so overall is sufficient a 16 mm long encapsulation, for example in the form of the metal cylinder 9. The intended vibrator can be therefore accommodate in a small space within the housing. "The interior of the enclosure 9 is evacuated.

The advantage of using a stepper motor as an electromechanical Converter results from the following: With an electromechanical! Converter with fork-like escapement device, who also performs a step every second, the shape of a gear wheel becomes so complicated that the outer diameter is about 5 to 7 mm; this is aimed for small size of the clock not accessible. The rotor of the stepper motor or pulse motor is round and simple, its outer diameter is only about 3 mm. Also this measure thus serves the space-saving training of the clock.

509841/0389

Dipl.-Ing. Heinz Lessor, Dip! -Lng Otto Flügel. Patent Attorneys D-8 Munich 81. Cosimastraße 81

- 7 -

As noted above, in the illustrated and preferred embodiment, each component on the circular board is such arranged that the adjustment shaft advantageously is close to the "three o'clock" display position, while the battery is located in the "twelve o'clock" display area. That Housing for the time-stable oscillator as a time standard in which the vibrator and its associated electronic Circuits form a structural unit, the battery is arranged adjacent. The drive coil of the pulse motor is located between the housing for the oscillator and the adjustment shaft. This is the edge area of the board from the adjustment shaft, the battery, the housing for the oscillator and the drive coil. The regulating or setting mechanism and the reset mechanism are in one area around the center of the remaining space of the board arranged so that each structural unit is provided in one level avoiding stacking.

Such an arrangement allows for a flat and small-sized one Execution of a round-edged clock. Furthermore the result is a simple connection of the electrical inputs and outputs. According to the assignment made above can be of three structural units, namely the battery block for the power supply, the housing block for the oscillator as Talk to the normal time and the mechanical block, which are arranged in the room of the clockwork. Everyone's way of working Each of these blocks can be adjusted individually. Each block can be installed and removed by just one corresponding connection or disconnection of the connections, which is done with the help of screw connections. That way is the embodiment is very easy to maintain.

In the context of the exemplary embodiment, a high-precision round clockwork with a large number of the sometimes large ones is thus obtained

509841/0389

Dipl.-Ing. Heinz Lesssr. Dipl-! Ng. Otto Hill. Patent Attorneys D-8 Munich 81. Cosimastraße 81

Elements in a very space-saving arrangement with simultaneous excellent suitability for mass production.

509841/0389

Claims (5)

Dipl.-Ing. Heinz Lesser. Dip! -Ing. Otto wing. Patent Attorney «- D-8 Munich 8t, Cosimaslraßc S1 CLAIMS 1. Quartz crystal wrist watch with a quartz crystal vibrator as a time standard, a divider circuit for dividing the vibrator signal into a low-frequency signal for driving a stepper motor consisting of a drive coil, a yoke and a pole wheel for driving a pointer gear train, characterized in that the pole wheel (29) itself designed as part of the gear train (29-31) and is directly integrated into this and that the yoke, which consists of highly permeable material, of the the stator parts (28 b, 28 c) associated with the pole wheel appear to be laterally offset with respect to the pole wheel axis Coil (28 a) runs and extends through it. 2. Clock according to claim 1, characterized in that that around the approximately centrally arranged gear train (29, 30) as the first structural unit of a rounded rim Clockwork around as a second unit a battery (26), as a third unit within a housing (8) the encapsulated Vibrator (9), an oscillator circuit (17 a), the frequency divider circuit (17 a) and a driver circuit (17 b) and the fourth unit, the drive coil (28 a) are arranged. 3. Clock according to claim 1 or 2, characterized in that that an adjustment shaft (24) in the area the three o'clock display and the battery (26) are arranged in the area of the twelve o'clock display of the clock, while the construction . ^: purity of the vibrator with the electronic circuit units downstream of it is arranged in a housing (8) adjacent to the structural unit of the battery and the connection 509341/0389 Dipl.-Ing. Heinz Lesser. Dipi-Ing Olto wing. Patent Attorneys · D-8 Munich 81. Cosirnastraße - 10 - Drive coil (28 a) of the stepping motor between this latter structural unit and the adjustment shaft in the edge area the round plate (25) is located. 4. Clock according to one of the preceding claims, characterized characterized in that a group of connections (16 c) for input and output signals of the Oscillator circuit, connections (10) of the vibrator and a feed connection (18 d) of the energy source (26) the side of the housing (8) facing the structural unit of the battery, while on the opposite side thereof Side the output connections (18 a) for the motor drive are provided. 5. Clock according to one of the preceding claims, characterized gekennzei c h net that the oscillator resonant circuit and divider circuit (17 a) using MOS transistors and the driver circuit (17 b) in FIG integrated circuit technology. £ 03841/0389