JP5834633B2 - Tide display device - Google Patents

Description

  The present invention relates to a tide display device that calculates and displays a tide state.

  There has been an electronic timepiece having a function of displaying simple tide information. In such an electronic timepiece, for example, one high tide time is approximated based on the age of the month, and the qualitative state of tide fullness is switched and displayed in a simple time interval based on this high tide time. With such a display, the electronic timepiece can provide simple tide information that can be used for leisure activities such as fishing and tidal hunting by performing simple calculations once a day.

  On the other hand, there is a conventional electronic device that has a function of calculating and displaying tide levels at predetermined time intervals and acquiring predicted tide level data. Patent Document 1 discloses a technique related to an electronic timepiece that displays a tidal wave height graph together with information such as time using a dot matrix type liquid crystal display. In Patent Document 2, tide information calculated outside a wristwatch and published on a web server is acquired via wireless communication or a removable storage medium, and the acquired tide information within a predetermined time is obtained. A technique related to a wristwatch having a function of displaying a graph and a numerical value is disclosed.

  In addition to the earth's rotation and the moon's revolution, the tide is influenced by the sun's attraction and the earth's revolution. By superimposing these effects, the timing of high tide and low tide will deviate from a certain period, or the tide level of high tide and low tide will be different every time. In addition, the movement of water is hindered by the difference in topography around each point, and conversely, the concentration of the tide level at each point is delayed by different times with respect to the influence of the moon and the sun. The difference in tide level at low tide and high tide is different.

  As a method of finding such a complicated tide level change, each element that causes tide is broken down into separate terms (trigonometric functions) for each different period (trigonometric function) (divided tide), and the value of each term is obtained and added ( Harmonic decomposition method) is widely used. In government offices, the tide level calculated using terms of several tens to 200 is published. In Patent Document 3, in a small tide display electronic device, the main 4 terms or 8 terms of these tides are calculated by simplified calculation, and the calculated value is added to obtain the tide level. A technique for performing pixel display using a dot matrix is disclosed.

JP 2002-156475 A Japanese Patent No. 4364137 Japanese Patent Laid-Open No. 1-61167

  However, when trying to find a highly accurate tidal level change using the harmonic decomposition method, the amount of calculation increases, and in particular, a large load is applied to the control unit of a small and portable electronic device, and it takes time to display. There was a problem of taking. On the other hand, with conventional electronic devices that display simple tide information, it is not possible to perform display corresponding to irregular changes in high tide time, and there is a problem that the displayed tide state may deviate greatly from the actual state. there were.

  An object of the present invention is to provide a tide display device capable of improving the display accuracy of a tide state with low power consumption.

In order to achieve the above object, the present invention
Display means for displaying a tide state at a predetermined time at a set point;
Second tide in the set point which is the predetermined time tide condition or low tide conditions definitive to the first reference time and after the predetermined time to be the first tide conditions are tide state or low tide conditions definitive previously Calculating means for calculating a second reference time to be in a state;
Display control means for acquiring a tide state at the predetermined time based on a time interval between the first reference time and the second reference time and displaying the tide state on the display means ;
The display means can selectively display which of the tidal state periods divided into a predetermined number of the predetermined time between the first reference time and the second reference time,
The display control means sets a time length of each of the tide state periods based on the first reference time and the second reference time calculated by the calculation means, and the tide state period including the predetermined time Select to display on the display means
It is a tide display device comprising a call.

  According to the present invention, in the tide display device, there is an effect that the display accuracy of the tide state can be improved with low power consumption.

It is a front view which shows the electronic wristwatch of embodiment of this invention. It is a block diagram which shows the internal structure of an electronic wristwatch. It is a figure explaining the display method of a tide. It is a flowchart which shows the control procedure of the tide display control process of 1st Embodiment. It is a flowchart which shows the control procedure of the high tide time calculation process of 1st Embodiment. It is a flowchart which shows the control procedure of the tide display control process of 2nd Embodiment. It is a flowchart which shows the control procedure of the high tide time calculation process of 2nd Embodiment. It is a front view of the electronic wristwatch of a 3rd embodiment. It is a block diagram which shows the internal structure of the electronic wristwatch of 3rd Embodiment. It is a flowchart which shows the control procedure of the tide display control process of 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a front view showing an appearance of the electronic wristwatch 1 of the first embodiment.
The electronic wristwatch 1 of the present embodiment includes a case 3, a display unit 11 (display means) provided at the lower part of the windshield 2 that covers the front surface, and four operation buttons B1 to B4 provided on the side surface of the case 3. And a band 9 attached to the wristwatch body and a bezel 8 provided on the upper surface of the peripheral edge of the windshield 2.

  The display unit 11 is, for example, a liquid crystal display unit, and digitally displays the time and various other information simultaneously or by switching. “This display unit 11 is provided with a plurality of segments, and by lighting up one segment or a combination of a plurality of segments, a numerical display such as time and date, a character display indicating a day of the week, an alarm function, etc. And a mark indicating on / off of various functions and a graphic for displaying a tide state can be displayed.

Next, the internal configuration of the electronic wristwatch 1 will be described.
FIG. 2 is a block diagram showing the internal configuration of the electronic wristwatch 1.

  The electronic wristwatch 1 includes a CPU (Central Processing Unit) 41, a ROM (Read Only Memory) 42, a RAM (Random Access Memory) 43, an oscillation circuit 45, and a frequency divider 46 as calculation means and display control means. A clock circuit 47, a power supply unit 51, an operation unit 52, a display drive unit 53, and a display unit 11.

The CPU 41 performs overall control of the entire electronic wristwatch 1 and performs various arithmetic processes. Further, the CPU 41 sends a control signal to the display driving unit 53 to display desired contents on the display unit 11.
The RAM 43 provides a working memory space to the CPU 41 and stores temporary data. The RAM 43 includes a high tide time table 43a (storage means) that stores the calculated high tide times. The ROM 42 stores various programs executed by the CPU 41 and initial setting data. The program stored in the ROM 42 includes a tide level calculation program 42a for calculating the high tide time.

  The oscillation circuit 45 oscillates and outputs a clock signal having a predetermined frequency. The oscillation circuit 45 is a crystal oscillation circuit, for example, and outputs a 16.384 MHz signal. The frequency dividing circuit 46 divides the clock signal input from the oscillation circuit 45 at a set ratio, outputs a 1 Hz signal to the time measuring circuit 47, and supplies a predetermined frequency signal to the CPU 41.

  The timer circuit 47 is a counter that counts the current time. The timer circuit 47 counts the one-second signal input from the frequency divider circuit 46, adds the count number to a preset current time, acquires current time data, and outputs the current time data to the CPU 41. Further, the current time can be corrected by overwriting the current time data held by the time measuring circuit 47 on the time measuring circuit 47 based on a command by the operation of the operation buttons B1 to B4.

  The operation unit 52 converts an operation input by pressing the operation buttons B1 to B4 into an electric signal and inputs the electric signal to the CPU 41.

  The power supply unit 51 supplies power to the CPU 41. Although this power supply part 51 is not specifically limited, For example, it combines a solar cell and a secondary battery.

  The display drive unit 53 performs voltage output control that determines whether each segment in the display unit 11 is turned on or off based on a display command input from the CPU 41.

Next, the display of the tide state in the electronic wristwatch 1 of the present embodiment will be described.
FIG. 3 is a diagram for explaining the display of the tide state in the electronic wristwatch 1.

  In the display unit 11 of the electronic wristwatch 1 of the first embodiment, the tide state from high tide (first tide state) through low tide to high tide (second tide state) is returned to seven sections (tide state period). It is possible to categorize and display. Here, the seven sections representing the tide state for one cycle are based on the high tide as a reference: high tide (second half) (a), low tide (first half (b), second half (c)), low tide (d), up tide (first half ( e), second half (f)), and high tide (first half (g)). The duration T of the tidal state (b to f) is set equal to each other. Further, the durations of the first half (g) and the second half (a) at the time of high tide are set to half (T / 2) of the length of the tide state (b to f) of the other five sections, respectively.

  Further, the display unit 11 can classify and display the magnitude of the tide change as one of a high tide (m), a middle tide (n), and a low tide (o). In the display unit 11, all the segments indicating the set tide change are turned on. Then, among the tide states divided into seven sections, the segment of the section including the current time is blinked and displayed at a predetermined time interval to represent the current tide state.

The electronic wristwatch 1 calculates the data of the first high tide time in one day for two days, and the first high tide time (first reference time) in the previous day and the first high tide time (second reference time) in the later day. The time interval T ₀ from the reference time) is divided into 14 sections, which are two periods of the seven sections (total time 12T), and the period of each tidal state is set. Therefore, if the time interval _{T 0} between two high tides wider, is set to be longer in duration _{T = T 0/12, T} / 2 = T 0/24 ratio is equal for each tidal conditions, between the two high tides and time interval T ₀ is narrowed, the duration T of each tidal conditions, T / 2 is set to be shorter in equal proportions.

  FIG. 4 is a flowchart showing a control procedure of the tide state display process executed by the CPU 41 in the electronic wristwatch 1 of the first embodiment.

  This tide state display process is a process that is started when the CPU 41 detects a tide state display command input by the user operating the operation buttons B1 to B4.

  When the tide state display process is started, the CPU 41 first refers to the high tide time table 43a to determine whether or not the current time is after the first high tide time on this day (step S11). If it is determined that the current time is before the first high tide time of the day, the process of the CPU 41 proceeds to step S13. On the other hand, if it is determined that the current time is after the first high tide time of the day, the CPU 41 performs a high tide time calculation process to calculate the first high tide time of the next day (step S12). This high tide time calculation process will be described in detail later. Then, the CPU 41 stores the obtained first high tide time on the next day in the high tide time table 43a. At this time, yesterday's first high tide time data stored in the high tide time table 43a can be deleted. Then, the process of the CPU 41 proceeds to step S13.

In the process of step S13, the CPU 41 calculates the time interval T ₀ between the current and tomorrow's high tide times stored in the high tide time table 43a, and divides this time interval T ₀ = 12T into 14 (step S13). These 14 time intervals are, in order, T / 2, T, T, T, T, T, T / 2, T / 2, T, T, T, T, T, and T / 2. Further, the CPU 41 sets a segment to be lit on the display unit 11 based on the age calculated in the high tide time calculation process and classified into a high tide, a middle tide, or a low tide (step S14). Specifically, for example, when the age of the moon is 27.8 to 1.8 and 13.0 to 16.6, the CPU 41 classifies it as a tide, and the ages of 5.6 to 9.2 and 20.4. In the case of ˜24.0, it is classified as a low tide, and in other months, it is classified as a mid tide.
By storing the processing results of steps S13 and S14 in the RAM 43, the processing of steps S13 and S14 can be omitted when the tide state display process is called again during the same high tide time.

  The CPU 41 lights up and displays the segment corresponding to each classification based on any of the classified high tide, middle tide, or low tide (step S15). CPU41 discriminate | determines the period in which the present time is contained among the periods of the tidal state divided into 14 and blinks and displays the segment of the said period (step S16). Then, the tide display control process ends.

Next, high tide time calculation processing will be described.
FIG. 5 is a flowchart showing a control procedure by the CPU 41 of the high tide time calculation process.

The calculation of the high tide time in the electronic wristwatch 1 of the first embodiment is as follows. The tide M ₂ is a half-day (about 12.4 hours) period of the moon and the half-day (12 hours) period is the sun. It carried out by overlapping and tidal S ₂ by tidal (main solar half day circumferential tide) of. Here, the amplitude ratio of the components (divided tides) of each of the tides M ₂ and S ₂ is a different value for each point where the tide level is obtained (set point), and is input in advance by a user operation and stored in the RAM 43. ing. Alternatively, this amplitude ratio may be stored in advance in the ROM 42 as a data table for representative points.

  When the high tide time calculation process is called, the CPU 41 first acquires the date of the next day and the time zone of the current position (step S121). Based on this date data, the CPU 41 calculates the position of the moon (yellow longitude) at a predetermined time (for example, 12:00) (step S122), and then calculates the position of the sun (yellow longitude) at the same time. (Step S123). Moreover, CPU41 calculates | requires the moon age and the median time of the moon from the difference (separation angle) of the lunar meridian and the solar meridian (step S124).

Next, based on the angle of separation and the amplitude ratio, the CPU 41 combines the half-day cycle tide M _{2 due} to the moon and the half-day cycle tide S ₂ due to the sun, and the phase of the tide H is the tide due only to the lunar attraction. It asks how much deviated from the M ₂ (step S125). A calculation formula for obtaining the magnitude of the deviation is stored in the ROM 42 in advance, and can be easily calculated by substituting the angle of separation and the amplitude ratio. Alternatively, this calculation formula may be set in the tide level calculation program 42a.

CPU41 includes a phase difference with respect to tidal M ₂ tidal H, it calculates the next day high tide time on the basis of the value of the preset monthly tide interval (step S126). The value of the moon tide interval is the average value of the time difference between the high tide time obtained based on the gravity balance due to the lunar attraction, that is, the time when the high tide is actually observed at the point from the middle time of the moon. This value is different for each observation point depending on the topography and the like, and is preset by a user operation or the like and stored in the RAM 43. Note that the value of this month tide interval, those but also includes the phase difference due to tidal S _2, the phase difference, when averaged are those substantially zero, changing the value of the month tide interval is not.
When the high tide time of the next day is calculated, the CPU 41 ends the high tide time calculation process.

As described above, the electronic wristwatch 1 according to the first embodiment includes the display unit 11 capable of displaying the tide state by dividing the tide state into seven sections, the calculated moon position and the sun position, and the preset moon tide interval. Based on the above, the first high tide time on the current day and the next day is obtained, respectively, and seven tide state periods are set based on the time interval T ₀ between the obtained two high tide times. Therefore, even if the interval between the two high tide times becomes longer or shorter due to the influence of the sun's attractive force from the 24 hour 50 minute period, the period of each tide state is extended or shortened by an equal ratio. Therefore, it is possible to suppress each displayed tide state from greatly deviating from the actual tide state.

  In addition, since only the high tide time is calculated and the tide state is set, the tide state can be easily displayed with a small amount of calculation without sequentially obtaining the changing tide level.

  Further, by using a liquid crystal display unit provided with a tide display segment as the display unit 11, a simple tide state can be easily displayed by a simple display method.

  Further, since the tide state is set and displayed using the timing of the high tide time as the reference time, in particular, the tide state before and after the high tide time can be displayed close to actual.

  In addition, seven tidal state periods are set simply by obtaining the first high tide time for each of two consecutive days based on the lunar eclipse, the moon and sun divergence, and the lunar tide interval. Therefore, it is possible to easily and easily display the tide state with less deviation than the conventional method based only on the age.

  In addition, the calculated two high tide times are stored in the high tide time table 43a, and the high tide time table 43a is updated to obtain a new next high tide time every time the current time passes both high tide times. The tidal state can be easily selected and displayed based on the calculation amount and the storage capacity.

  In addition, the age of the tide is calculated at the same time as calculating the high tide time, and it can be classified into one of the tide, mid tide, and low tide based on this age, and the magnitude of the change in tide level can be displayed, so the amount of calculation is almost increased Without being able to display the tide level state in more detail.

[Second Embodiment]
Next, the electronic wristwatch 1 according to the second embodiment will be described.
The internal configuration of the electronic wristwatch 1 according to the second embodiment is the same as the internal configuration of the electronic wristwatch 1 according to the first embodiment.
In the electronic wristwatch 1 of the second embodiment, two consecutive high tide times are calculated and the tide state for one cycle is set. In addition, when calculating the high tide time, in addition to the tides M ₂ and S ₂ due to the half-periodic tides, the tide due to the half-period tides is used as one day due to the lunar attraction (about 25.8 hours). ) Period tide O ₁ (main lunar diurnal tide) and one day (about 23.9 hours) tide K ₁ (sun-moon combined diurnal tide) combined with the influence of lunar and solar attraction Either or both are considered. By overlapping these half-day tides and about one-day tides, the time interval between two high tides becomes uneven or the tide level at high tide is greatly different. The situation is expressed. The points other than these are the same as the tidal state display processing in the first embodiment, and the same reference numerals are given and description thereof is omitted.

  FIG. 6 is a flowchart showing a control procedure of the tide display control process in the electronic wristwatch 1 of the second embodiment.

  When the tide state display process is started, the CPU 41 first determines whether or not all the high tide time data before and after the current time are stored in the high tide time table 43a (step S11a). If it is determined that both of the two high tide time data are stored in the high tide time table 43a, the processing of the CPU 41 proceeds to step S13a. On the other hand, if it is determined that the two high tide time data before and after the current time are not stored in the high tide time table 43a, the CPU 41 calls the high tide time calculation process and calculates the next high tide time ( Step S12). Then, the CPU 41 stores the obtained next high tide time in the high tide time table 43a. For example, in the first tide state display process, when the high tide time before the current time is not stored, the CPU 41 also calculates the high tide time before the current time and stores it in the high tide time table 43a. . Then, the process of the CPU 41 proceeds to step S13a.

In the process of step S13a, CPU 41 calculates a time interval _{T 1} of the high tide time of the two times, and divides the time interval _T 1 = 6T into seven sections. At the time of this division, similarly to the first embodiment, the length of the two sections before and after the high tide is set to half of the length T of the other five sections (T / 2).

The CPU 41 blinks and displays the segment indicating one tide state by the process of step S16, and ends the tide display control process after starting counting the remaining time of the tide state. When the remaining time of the tide state being displayed becomes zero, the tide display control process is called again by the interrupt signal. When the current time is the high tide time, the data stored as the next high tide time becomes the previous high tide time, and the process branches to “NO” in the process of step S11, and the CPU 41 performs the processes of steps S12 to S14. Execute. Then, the CPU 41 executes the next high tide time calculation process to calculate the next high tide time. The CPU 41 blinks and displays a segment representing the next tide state (step S16) and starts counting the remaining time of the tide state.
Note that the start time of each tide state may be set instead of the duration of each tide state.

  FIG. 7 is a flowchart showing a control procedure of high tide time calculation processing in the electronic wristwatch 1 of the second embodiment.

  When the high tide time calculation process of this embodiment is called, the CPU 41 first acquires the date for obtaining the high tide time, the longitude of the point for obtaining the tide level, and the time zone (step S221). Here, as the date for obtaining the high tide time, for example, if the high tide time before the current time stored in the high tide time table 43a is before 16:00 on the current day, the current date is selected. The next day's date is selected. Alternatively, the two high tide times before may be used as selection criteria. As the longitude and time zone information, data stored in the RAM 43 in advance by user operation input is read.

  Next, the CPU 41 calculates the longitude of the moon at a predetermined time (for example, 12:00) on the set date (step S122), and then calculates the longitude of the sun at the same time (step S123).

  Then, the CPU 41 sets a detection period for detecting the next high tide time based on the previous high tide time (step S224). Usually, the interval between two high tides is 8 to 17 hours. Therefore, the CPU 41 sets this range as the detection period, for example. The CPU 41 can also set the detection period to be shorter based on the age determined based on the lunar eclipse and the solar ecliptic, and on the two tide times before.

  The CPU 41 calculates the tide level by a preset number (that is, 3 or 4 in this case), respectively, and adds these to calculate the tide level at each timing in the set detection period ( Step S225). Here, the CPU 41 does not have to calculate all the tide levels in the detection period at regular time intervals. Various known calculation methods for obtaining the maximum value can be applied. For example, the CPU 41 may select a time for obtaining the tide level every time so as to converge to a time at which the tide level is high.

  Then, the CPU 41 sets the time when the maximum value is obtained from the obtained tide levels as the high tide time (step S226). If the obtained high tide time is the last time of the selected date (for example, 24:00), the CPU 41 changes the date to the next day and repeats the processing of steps S224 to S225. If the obtained high tide time is the first time (0:00) of the selected date, the CPU 41 changes the date to the previous day and repeats the processing of steps S224 to S225. When the high tide time is acquired, the CPU 41 ends the high tide time calculation process.

  In this way, when the tide level is obtained by superimposing many tides using the harmonic decomposition method and it is difficult to obtain the high tide time analytically, it can be obtained asymptotically. is there. Even with this method of obtaining numerical high tide time, it is relatively more than calculating the tide level in the order of time passage based on information such as possible waveform restrictions and previous and previous high tide times. The high tide time can be acquired easily and quickly.

  As described above, in the electronic wristwatch 1 of the second embodiment, the latest high tide time before and after the current time is calculated, and is divided into seven tide states based on the time interval between the two high tide times. Therefore, the change in the tide state between adjacent high tide times can be displayed on the display unit 11 more accurately.

  In addition, by setting the tide state based on the time interval between two adjacent high tide times in this way, it is possible to acquire the high tide time by combining the half-day cycle tide and the daily cycle tide. Even when the time interval between two high tide times is greatly different, the tide state during each period can be displayed more faithfully.

  Even when the tide level is calculated by combining the tides, the amount of calculation for displaying the tide state can be greatly reduced by acquiring only the high tide time.

[Third Embodiment]
Next, an electronic wristwatch according to a third embodiment will be described.
Although the electronic wristwatch 1 of the first embodiment and the second embodiment has been described with a digital display function, the tide display device of the present invention is not limited to a digital display. This tide display device may be an electronic wristwatch that uses both digital display and analog display with hands, or may be an electronic watch that only uses analog display with hands.

  FIG. 8 is a front view of the electronic wristwatch 1a of the third embodiment. FIG. 9 is a block diagram showing the internal configuration of the electronic wristwatch 1a.

  This electronic wristwatch 1 a has an hour hand 13, a minute hand 14, a second hand 15, and a function hand 16 that are rotatable between a windshield glass 2 and a dial 12 provided at the lower part of the windshield glass 2. Instead of it. In addition, a sign 160 indicating a tide state is provided on the dial 12, and the function hand 16 indicates a tide level state by selectively pointing to one tide state on the sign 160.

  As shown in FIG. 9, the electronic wristwatch 1a includes an hour hand 13, a minute hand 14, a second hand 15, a function hand 16, and an hour hand 13 instead of the display unit 11 and the display driving unit 53. An hour hand drive unit 33 that drives through the mechanism 23, a minute hand drive unit 34 that drives the minute hand 14 through the train wheel mechanism 24, a second hand drive unit 35 that drives the second hand 15 through the train wheel mechanism 25, and a function A functional needle drive unit 36 that drives the needle 16 via the train wheel mechanism 26 is provided. Other configurations are the same as those of the electronic wristwatch 1 of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  FIG. 10 is a flowchart showing the control procedure of the tide display control process executed by the CPU 41 in the electronic wristwatch 1a of the third embodiment.

  In the tide display control process in the electronic wristwatch 1a of the third embodiment, the processes of steps S14 and S15 are omitted from the tide display control process in the electronic wristwatch 1 of the second embodiment shown in FIG. In addition, after the process of step S13a is executed, in the process of step S16a, the CPU 41 selects a tide state corresponding to the current time and sends a command to the function hand drive unit 36 to drive the function hand 16 to function. The needle 16 is caused to indicate the portion of the sign 160 corresponding to the selected tide state. The processes in steps S12 and S13a are the same as the processes performed in the tide display control process in the electronic wristwatch 1 of the second embodiment, and the same reference numerals are given and the description thereof is omitted.

  As described above, the electronic wristwatch 1 a according to the third embodiment includes the hour hand 13, the minute hand 14, the second hand 15, and the function hand 16 instead of the display unit 11 that performs digital display, and is provided on the dial 12. The indicator corresponding to the current tide state is selected from the signs 160 indicating the tide state and indicated by the function hand 16. Therefore, the analog display type electronic wristwatch 1a using the pointer can easily perform the simple display of the tide state.

  Further, since the tide state is indicated based on the position indicated by the function hand 16, unlike the blinking state, the user can instantly know the tide state.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the above-described embodiment, the tide state at the current time is displayed, but it is also possible to input and set a desired date and time and display the tide state for a period including the set time (predetermined time). good.

  Moreover, in the said embodiment, although the reference time for setting a tide state was made into the timing of a high tide, it is not restricted to this. For example, the tide state may be set on the basis of the low tide timing, or both the high tide and low tide timings may be calculated to set each tide state for a half cycle between adjacent high tides and low tides. Good.

  In the above embodiment, the next high tide time is newly calculated at high tide. However, regardless of the high tide time, for example, the CPU 41 may calculate the next high tide time at 0:00. Good.

Moreover, in the said 1st Embodiment and 2nd Embodiment, although the tide state display was performed by the segment display, it is good also as displaying using other systems, such as a dot matrix system. Moreover, in the said embodiment, although the segment for 1 period was provided and displayed on the display part 11, it is good also as providing the segment for 2 periods.
In addition, the current tide state is shown by blinking the segment of the tide state period at the current time, but it may be expressed in other colors using segments that can be displayed in color, or other than the current tide state For the tidal state period, a segment that can light only the frame line may be provided.

  Further, in the above embodiment, the high and low tide is divided into two, but it may be simply divided into six equal parts based on the high tide time. Moreover, it is good also as dividing and displaying into a different number of tide states according to the segment arrangement | positioning of the display part 11. FIG.

  In the third embodiment, only the tide state is displayed by the function hand 16, but the magnitude of the tide change may be indicated by using another function hand or the second hand 15. Alternatively, the functional hand 16 may not be provided, and the tide state may be indicated by the hour hand 13, the minute hand 14, or the second hand 15.

  In the above embodiment, the calculated high tide time is stored in the high tide time table 43a. However, the length of the tide state period T and the data of the start time of each tide state period are associated with the data of each high tide time. It is also possible to memorize it.

In the above embodiment, the high tide time is obtained using two tides in the first embodiment, and the high tide time is obtained using 3 or 4 tides in the second embodiment. Absent. For example, the number of tides used for calculating the high tide time may be reversed. In addition, although the amount of calculation increases, other tides such as the tide P ₁ (main solar diurnal tide) with a period of one day (about 24.1 hours) due to the attractive force of the sun can be further used.

In the above embodiment, an electronic wristwatch has been described as an example of a tide display device. However, the tide display device may be applied to other arm-mounted terminals such as a pedometer.
In addition, the specific configuration, arrangement, numerical values, and operation procedure shown in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and equivalents thereof.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.

[Appendix]
<Claim 1>
Display means for displaying a tide state at a predetermined time at a set point;
Calculating means for calculating a first reference time at which the first tide state is set before the predetermined time at the set point and a second reference time at which the second tide state is set after the predetermined time;
A tide display device comprising: display control means for acquiring a tide state at the predetermined time based on a time interval between the first reference time and the second reference time and displaying the tide state on the display means.
<Claim 2>
The display means can selectively display which of the tidal state periods divided into a predetermined number of the predetermined time between the first reference time and the second reference time,
The display control means sets a time length of each of the tide state periods based on the first reference time and the second reference time calculated by the calculation means, and the tide state period including the predetermined time The tide display device according to claim 1, wherein the tide display device is selected and displayed on the display means.
<Claim 3>
The display means includes a segment provided for each tide state period, and displays the tide state by changing a lighting state of a segment representing the tide state period including the predetermined time. The tide display device according to claim 2.
<Claim 4>
The display means includes a dial and one or a plurality of pointers provided so as to be rotatable on the dial, and a marker provided on the dial for each tide state period is indicated by the pointer. The tide display device according to claim 2, wherein the tide state at the predetermined time is displayed by giving an instruction.
<Claim 5>
The calculation means calculates the latest high tide time before the predetermined time as the first reference time, and calculates the latest high tide time after the predetermined time as the second reference time. Item 5. The tide display device according to any one of items 1 to 4.
<Claim 6>
The calculating means calculates a first high tide time that is the first high tide time of two consecutive days sandwiching the predetermined time and is earlier than the predetermined time as the first reference time, and is later than the predetermined time. The tide display device according to claim 1, wherein the high tide time is calculated as the second reference time.
<Claim 7>
The tide display device according to claim 1, wherein the predetermined time is a current time.
<Claim 8>
Storage means for storing the first reference time and the second reference time calculated by the calculation means;
When the current time is past the second reference time, the calculation means sets the second reference time as the first reference time, calculates a new second reference time, and stores the storage means. Remember
The said display control means sets the time length of each said tide state period based on the said new 1st reference | standard time and the said 2nd reference | standard time memorize | stored in the said memory | storage means. Tide display device.
<Claim 9>
The calculating means calculates the position of the sun and the position of the moon with respect to the set point,
The display control means classifies the magnitude of the tide change into a predetermined number of stages based on the relative positional relationship between the position of the sun and the position of the moon on the date including the predetermined time, and determines the magnitude of the tide change. Is displayed on the display means. The tide display apparatus according to any one of claims 1 to 8.

DESCRIPTION OF SYMBOLS 1, 1a Electronic wristwatch 2 Windshield 3 Case 8 Bezel 9 Band 11 Display part 12 Dial 13 Hour hand 14 Minute hand 15 Second hand 16 Function hand 23-26 Wheel train mechanism 33 Hour hand drive part 34 Minute hand drive part 35 Second hand drive part 36 Function hand Drive unit 41 CPU
42 ROM
42a Tide level calculation program 43 RAM
43a High tide time table 45 Oscillation circuit 46 Dividing circuit 47 Timekeeping circuit 51 Power supply unit 52 Operation unit 53 Display drive unit 160 Signs B1 to B4 Operation buttons

Claims (8)

Display means for displaying a tide state at a predetermined time at a set point;
Second tide in the set point which is the predetermined time tide condition or low tide conditions definitive to the first reference time and after the predetermined time to be the first tide conditions are tide state or low tide conditions definitive previously Calculating means for calculating a second reference time to be in a state;
Display control means for acquiring a tide state at the predetermined time based on a time interval between the first reference time and the second reference time and displaying the tide state on the display means ;
The display means can selectively display which of the tidal state periods divided into a predetermined number of the predetermined time between the first reference time and the second reference time,
The display control means sets a time length of each of the tide state periods based on the first reference time and the second reference time calculated by the calculation means, and the tide state period including the predetermined time Select to display on the display means
Tide display device comprising a call. The display means includes a segment provided for each tide state period, and displays the tide state by changing a lighting state of a segment representing the tide state period including the predetermined time. The tide display device according to claim 1 . The display means includes a dial and one or a plurality of pointers provided so as to be rotatable on the dial, and a marker provided on the dial for each tide state period is indicated by the pointer. tidal display device according to claim 1, wherein the displaying the tidal state at the predetermined time by an instruction. The calculation means calculates the latest high tide time before the predetermined time as the first reference time, and calculates the latest high tide time after the predetermined time as the second reference time. Item 4. The tide display device according to any one of items 1 to 3 . The calculating means calculates a first high tide time that is the first high tide time of two consecutive days sandwiching the predetermined time and is earlier than the predetermined time as the first reference time, and is later than the predetermined time. tidal display device according to any one of claim 1 to 3, a high tide time and calculates a second reference time. Said predetermined time, tidal display device according to any one of claim 1 to 5, characterized in that the current time. Storage means for storing the first reference time and the second reference time calculated by the calculation means;
When the current time is past the second reference time, the calculation means sets the second reference time as the first reference time, calculates a new second reference time, and stores the storage means. Remember
Wherein the display control unit, according to claim 6, characterized in that for setting the time length of the tidal state period each based on the new first reference time and the second reference time stored in the storage means Tide display device. The calculating means calculates the position of the sun and the position of the moon with respect to the set point,
The display control means classifies the magnitude of the tide change into a predetermined number of stages based on the relative positional relationship between the position of the sun and the position of the moon on the date including the predetermined time, and determines the magnitude of the tide change. Is displayed on the display means. The tide display device according to any one of claims 1 to 7 .

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