CH688949GA3 - Watch comprising a display device of a predetermined geographical location. - Google Patents

Description

The present invention relates to a watch comprising a device for indicating a predetermined geographic location. To indicate the direction of a first predetermined geographic location from any second geographic location, it is necessary to have a geographic reference and to know the angle formed between this reference and the outline passing through said first and second places. For example, the predetermined geographic location is Mecca.

For reference, it is known to use a compass indicating the direction of magnetic north. In this case, the direction of said first place is given by the magnetic azimuth of this first place relative to said second place; that is to say by the angle formed between the orthodromy passing through the second place and the magnetic north and the orthodromic passing through this second place and the first place. Thus, a device for indicating a predetermined location from any second location taken from a plurality of determined locations must include means selectively supplying the respective magnetic azimuths of said predetermined location relative to said plurality of determined locations.

The document FR 2 681 159 describes a watch comprising a compass and means for introducing a city where a user is located, arranged to allow scrolling of the names of continents and to select one; then scroll through countries and select one; finally names of cities in this country and select one. The process of entering the user location is complex and slow, especially if a large number of city names are expected for certain countries.

The document EP 0 154 096 describes a selection of a name of cities from a plurality of names of cities stored in a memory of the watch, this selection being carried out, as in the case cited above, by scrolling the names of cities on a watch screen and the actuation of scroll buttons and validation of a choice.

Document EP 0 165 381 describes a portable device, used to indicate the direction of Mecca, where different zones are stored using their geographic coordinates (latitude and longitude), the magnetic azimuth of Mecca having to be calculated by a microprocessor designed for this purpose after selection by the user of a predetermined area. The means of identifying the zones offered are either the names of the zones, or a code which is given using a special list designed for this purpose for a given number of zones, either the geographic coordinates or the code international airports. Using a device-specific code requires having a list with you. The use of geographic coordinates requires the use of a map. Regarding the code of international airports, it also requires to have a brochure with these codes, otherwise the average user will be unable to use the device without having first searched for this code at the cost of significant effort. .

An object of the present invention is to provide a watch comprising a device for indicating magnetic north and means for precise indication of a predetermined geographic location from a plurality of geographic regions comprising a large number of regions.

Another object of the invention is to provide such a watch arranged so that a user can easily know the direction of said predetermined location from any region of said plurality of geographic regions.

The subject of the invention is therefore a watch comprising: - a device for detecting the Earth's magnetic north, - first means for indicating a direction in a plane of the watch, - second electronic means arranged to provide the mean magnetic azimuth of a predetermined place relative to any region of a plurality of determined geographic regions, and - third means arranged to allow a user to selectively supply to said second electronic means a number from a plurality of numbers. Said second electronic means are associated with said device for detecting the direction of magnetic north in order to determine, in said plane of the watch, the direction of said geographic location defined as the mean magnetic azimuth of this location from any one of said geographic regions in which said user is located, this direction being capable of being indicated by said first means controlled by said second means. This watch is characterized in that said second electronic means comprise a memory in which the average magnetic azimuths of said predetermined place are stored respectively from said plurality of geographic regions, said memory being addressed so that each number of said plurality of numbers corresponds to an average magnetic azimuth among said average magnetic azimuths, and in that each of said numbers of said plurality of numbers includes the telephone code of the country in which the respective geographic region of said plurality of geographic regions is located.

It follows from the abovementioned characteristics that the watch according to the invention can be used from a large number of regions, each of these regions being simply coded by a respective number comprising the telephone code of the country including this region which the user can provide to the means electronics arranged to select the corresponding mean magnetic azimuth.

According to a preferred variant, each of the numbers of said second plurality is formed by the telephone code of the country in which the respective region of said first plurality is located, followed by the telephone code of this region.

It follows from the characteristic of the preferred variant mentioned above that almost every inhabited place on the globe can be identified with a given region in which this place is located. Then, in regions with a certain population density, each region corresponding to one and the same telephone code has relatively small dimensions, which ensures good accuracy in indicating said predetermined location.

Finally, it is generally easy for a user to know the telephone code of the place where he is. Thus, without having a detailed and bulky correspondence table, a user can supply, from any place having a telephone network, the code number allowing the electronic means to determine the corresponding magnetic azimuth, which is stored in an electronic memory of the watch according to the invention.

Other characteristics and advantages of the invention will be described below with the aid of the following description, given with reference to the accompanying drawings, given by way of non-limiting examples, in which:

 - fig. 1 is a general top view of a watch according to a first embodiment;  - fig. 2 is a schematic representation of the first embodiment;  - fig. 3 is a schematic representation of a second embodiment of a watch according to the invention.

Referring below to Figures 1 and 2, there will be described a first embodiment of a watch according to the invention.

Watch 1 is a wristwatch comprising a case 2 and a bracelet 4. Case 2 notably includes a bezel 6 and a dial 8, an area of which is provided for a digital display 10. The hour indices are provided on the bezel 6 for analog time display using hands 12 and 14.

Watch 1 comprises a control device 18 integral with a crown 19 actuable by a user of the watch. The device 18 is electrically associated with an electrical device 20 to supply an electronic management and control unit 22 with an input signal 24. The unit 22 is electrically connected to the digital display 10 formed by a liquid crystal display (LCD) with four digits. If necessary, the number of digits can obviously be greater than four. The unit 22 is also connected to an information storage unit 26 subsequently named "memory".

The unit 22 is also connected to a device 28 for detecting the direction of the terrestrial magnetic north comprising a permanent magnet 30 rotatably mounted on an axis 32. The magnet 30 is a bipolar magnet with radial magnetization. This magnet thus has a magnetic axis 34 perpendicular to the axis 32. The device 28 also includes two magnetic sensors 36 and 38 arranged to pick up the magnetic flux from the magnet 30 and determine the direction of the magnetic axis 34. Both sensors 36 and 38 are connected to an electronic unit 40 for processing the electrical signals supplied by the sensors 36 and 38 respectively. The unit 40 provides the unit 22 with an electrical signal 42 representative of the direction of the magnetic axis 34 in the general plane of the watch, corresponding to the plane of the dial 8, relative to a reference axis located in this general plane. By way of example, this reference axis is formed by a six o'clock - twelve o'clock axis fixed relative to the case 2.

Finally, the unit 22 is electrically connected to an electromagnetic motor 46 mechanically coupled to the needle 14. The unit 22 is arranged to control the motor 46, in particular in a step-by-step operating mode known to those skilled in the art .

The operation of the watch in a mode of indicating the direction of a predetermined place and according to the first embodiment of the invention will be described below.

According to the invention, provision is made for a user of the watch to be able to selectively supply, to the electronic unit 22, input signals respectively representative of a plurality of numbers. To do this, the unit 22 includes a memory or an internal counter programmable by means of the devices 18 and 20. The number corresponding to the electrical state of the internal counter can be displayed on the display 10 so that the user is aware of the state of this counter. Data input devices comprising the devices 18 and 20 are known from the prior art, in particular documents CH 632 894, CH 608 164 and EP 0 569 868.

The devices 18 and 20 and the unit 22 are arranged so that it is possible to selectively vary each of the digits of the four digits of the display 10 to form any number selectable by a user. For example, a procedure for selecting a number is as follows:

 1) Press the crown 19 for a period of time greater than three seconds, which has the effect of initializing the internal counter of the unit 22 and also the display 10 which then displays four zeros, the first of which is underlined or flashes;  2) Turn the crown 19 in one direction or the other to increment or decrement the digit of the first digit until the desired digit appears;  3) Press crown 19, which has the effect of activating the second digit in selection mode;  4) Turn the crown 19 to select the number for the second digit;  5) Do the same for the third and fourth digits;  6) Press crown 19 again once all the digits of the four digits have been selected, which results in the recording of the number selected in the programmable memory or the internal counter of unit 22.

Each of the numbers selectable by the user and included in a plurality of determined numbers corresponds to a given geographic region. For each of these given geographic regions, a person skilled in the art can determine the value of an average magnetic azimuth corresponding to the direction of a predetermined location. In the memory 26 is stored a plurality of mean magnetic azimuths of said predetermined place, in particular of Mecca, respectively from a plurality of geographic regions coded by means of said plurality of numbers selectable by the user of the watch.

The memory 26 is thus addressed so that to each number of said plurality of numbers corresponds a respective magnetic azimuth whose value can be supplied to unit 22 when this number is recorded in said internal counter of unit 22.

Using the control signal 42 supplied by the device 28 and the value of the mean magnetic azimuth supplied by the memory 26, the unit 22 determines the angular position for the needle 14, serving as a direction indicator , relative to a reference axis of watch 1, in particular the six o'clock - twelve o'clock axis. Then, the unit 22 is arranged to control the motor 46 so that the latter angularly positions the needle 14 to align this needle 14 with the direction of a predetermined place, in particular of Mecca. To do this, it is necessary that the initial position of the needle 14 is known to the unit 22 when activating a mode for indicating a predetermined place. The temporal determination of the position of a hand in a watch is known to those skilled in the art. In general, an initialization step is provided to locate the initial position of the hand after an interruption of the power supply to the watch.

In the embodiment described here, it is intended that the plurality of numbers selectable by a user of the watch correspond to the respective telephone codes of the plurality of geographic regions. In the variant represented in FIG. 1, each selectable number has four digits provided for the telephone code of the country followed by the telephone code of the region concerned. By way of example, the number 4138 shown in FIG. 1 is made up of the number 41 corresponding to the telephone code for Switzerland and the number 38 corresponding to the telephone code for the region of Neuchâtel in Switzerland.

Coding using telephone codes is particularly clever and efficient. In any place having a telephone network, a user can know the code number making it possible to indicate the position of the user to the electronic management and control unit 22.

Using fig. 3, a second embodiment of the invention will be briefly described below. The references already described above will not be described again here.

This second embodiment differs from the first embodiment in that the selection of the value of each digit making up the code number selectable by a user by means of the devices 18 and 20 is carried out by means of the hands 12 and 14. When the watch is activated in a mode for selecting a code number, the electronic management and control unit 52, similar to unit 22 of the first embodiment, controls the electromagnetic motors 46 and 54 so that the two hands 12 and 14 are superimposed on each other by pointing to one of the numbers 1 to 10 provided on the dial or the bezel of the watch case shown diagrammatically in FIG. 3 by the ring 56. By one or more successive presses on the crown 19 secured to the device 18, the hands 12 and 14 are aligned with any one of the figures 1 to 10 serving for the indication of the hours. The index 10 indicating ten hours corresponds, in the code number selection mode, to the digit zero.

By way of example, the joint positioning of the hands 12 and 14 on any one of the digits 1 to 10 is carried out by short presses on the crown 19. Once the first digit has been selected, a long press is made on the crown 19 so as to store this digit in unit 52 and proceed to the selection of the second digit composing the code number. The selection of each of the digits of the number selected by the user is carried out in an equivalent manner.

It will be noted here that, in an alternative embodiment, a single needle can be used for the selection of the figures composing the code number, for example the needle 12.

Claims (5)

1. Watch including: - a device (28) for detecting the direction of terrestrial magnetic north, - first means (14, 46) for indicating a direction in a plane of the watch, - second electronic means (22, 26; 52) arranged to provide the mean magnetic azimuth of a predetermined location relative to any region of a plurality of determined geographic regions, and - third means (10; 12, 14, 18, 19, 20) arranged to allow a user to selectively supply to said second electronic means a number from a plurality of numbers, said second electronic means being associated with said device for detecting the direction of magnetic north to determine, in said plane of the watch, the direction of said predetermined place defined as the mean magnetic azimuth of this place from any one of said geographic regions in which said user is located, this direction being capable of '' be indicated by said first means controlled by said second means, this watch being characterized in that said second electronic means comprise a memory (26) in which are stored the average magnetic azimuths of said predetermined place respectively from said plurality of geographic regions , said brief being addressed such that to each number of said plurality of numbers corresponds an average magnetic azimuth from said average magnetic azimuths, and in that each of said numbers of said plurality of numbers comprises the telephone code of the country in which the geographical region is situated respective of said plurality of geographic regions. 2. Watch according to claim 1, characterized in that each of said numbers is formed by the telephone code of the country in which the respective region of said plurality of geographic regions is located, followed by the telephone code of this region. 3. Watch according to any one of claims 1 to 2, characterized in that said device for detecting (28) the direction of the terrestrial magnetic north comprises a permanent bipolar magnet (30), with radial magnetization, freely mounted on an axis (32) and at least two magnetic sensors (36, 38) arranged to sense the magnetic flux of said magnet, said watch further comprising fourth electronic means (40, 22; 52) associated with said magnetic sensor to determine the angular position of the magnetic axis (34) of said magnet, said fourth electronic means being associated with said second electronic means for controlling said first means so that the latter indicate the direction corresponding to said average magnetic azimuth of said predetermined location. 4. Watch according to one of the preceding claims, characterized in that said third means (10; 12, 14, 18, 19, 20) comprise a display device (10; 12, 14) and an electrical device (20 ) associated with a control device (18, 19) operable by said user, said electrical device being arranged to supply an input signal (24) to said second means (22; 52), which control said display device allowing this user to select any number from said plurality of numbers. 5. Watch according to claim 4, characterized in that said display device (12, 14) comprises at least one hand (12) associated with fixed indices representative of the digits zero to nine.