JPS61108989A - World watch - Google Patents

Abstract

PURPOSE:To permit the optional assignment of a home area and various areas of the world and to decrease considerably electric power consumption by executing the rewriting of the time data stored into two display memories when there is a carry from the minute and under the other specific conditions. CONSTITUTION:The carry process to the hour digit in a time counter 1 is executed when there is the carry from the minute data to the hour data in the counter 1. A '1' is then added to the hour data of the display memory 8 and is again written into the memory 8. The hour data of the display memory 9 is also added with the '1' and the data is again written into the memory 9. The minute data of the counter 1 is written into the minute data of the memories 8, 9 in the stage of the carry from the second. An arithmetic means 10 makes the subtraction of the hour data of the counter 1 and the changed time difference data and writes the result thereof into the memory 9 when the time difference data of an area counter 4 is changed by the operation of a switch 12. The time of the changed area is thus displayed on a display part 7.

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a world clock that digitally displays the current time of each region of the world, and in particular, the present invention relates to a world clock that digitally displays the current time of each region of the world, and in particular, the time display section of the region of use and the time of each region of the world. The present invention relates to a world clock equipped with a display section that selectively displays information.

(Naka) Conventional technology In conventional world clocks, switches for selecting each region of the world are set on the map or other parts, and by operating these switches, the time difference of the selected region is generated from the time difference memory circuit. This time difference was added or subtracted from the reference time, and the result was displayed on a display device. This is described, for example, in Japanese Unexamined Patent Publication No. 51-65671.

(/-1 Problems to be Solved by the Invention)However, the world clock described above has a large number of switches, and the time difference must be stored in correspondence with the switches, making the mechanism complex and reducing the storage capacity. Furthermore, when displaying the month, day, etc. of a selected region in addition to the time of the selected region, if the reference point is set to your home country or Greenwich Mean Time, the time difference may be added or subtracted. Sometimes the moon,
Adjusting the date becomes complicated. In addition, in order to display
Since addition and subtraction operations have to be performed, power consumption is high.

B) Means for Solving the Problems The present invention has been made in view of the above-mentioned points, and it is possible to calculate seconds, minutes, hours, months, days, days of the week, etc. using the area including the international date line as a reference point. A time counter means for obtaining time information, a region counter means for designating each region of the world and storing time difference data from a reference location, and subtraction or addition of time information of the time color/reduction means and time difference data of the home region memory means. A first display memory for storing display data to be displayed on the first display unit, in which the processed result is written, and a subtraction or addition processing result of the time information of the time counter means and the time difference data of the area counter means, and a second display memory for storing display data to be displayed on the second display section, the hour data in the first display memory is changed when there is a carry from the minute, and the time difference data is stored in the home area memory means. The hour data in the second display memory is rewritten when there is a carry from minutes or when the contents of the regional counter means change.

(e) Effect The above-mentioned y port (, rewriting of the data stored in the first display memory and the second display memory is performed when there is a carry from the minute and when the data is stored in the home area memory means. This is done when the data is transferred or when the time difference data of the regional counter means changes, so the number of subtraction or addition processes is reduced, resulting in a reduction in power consumption.

(f) Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention. The time counter means (1) calculates seconds, minutes, hours, based on the second signal.
It is a counter for counting the day, day of the week, month, and year, and the alarm counter means (2) consists of a minute and hour counter for storing the alarm time.

The alarm means (3) detects whether or not the minute and hour clock data of the time counter means (1) and the minute and hour alarm data of the alarm counter means (2) match. When detected, it is notified by an acoustic signal or the like. These time counter means (1) and alarm counter means (2) represent the current time and alarm time at a reference location, and an area including the international date line, for example, Unilinton, is selected as the reference location. . On the other hand, the regional counter means (4) is composed of an up/down counter in 24 decimal notation, and can set the time difference of each region of the world in one hour steps with the reference point as "0". The data representing the area also represents the area. Further, the home region memory means (5) stores the time difference of the place where the world clock is used, and data set in the region counter means (4) can be transferred.

On the other hand, the first display section (6) constantly displays the time in the home area, and is composed of, for example, a four-digit alphanumeric display element. Further, the second display section (7) displays the local time set in the regional counter means (4) or the alarm time in that region, and is similar to the first display section (6). It consists of a 4-digit alphanumeric display element. The first display section (6) and the second display section (power include
A first display memo (January 8) and a second display memory (9) for storing display data are provided. The first display memory (8) and the second display memory (9) each have a capacity to store display data of four digits of numbers or characters, and the first display memory (8) stores them. The display data stored in the second display memory (9) is always displayed on the first display section (6), and the display data stored in the second display memory (9) is always displayed on the second display section. In order to change the display on the first display section (6) or the second display section (7),
The contents of the display memory (8) or the second display memory (9) are rewritten.

Further, the calculation means α1 contains the time data of the time counter means (1), the alarm data of the alarm counter means (2), the time difference data set in the region counter means (4), and the home region memory means ( 5) is applied, and based on the switch input and the output of the control means αυ, the time difference data of the home area memory means (5) is calculated from the time data of the time counter means (1). Subtract the result, and store the result in the first display memory (8). Also, subtract the time difference data set in the area counter means (4) from the data at time counter means (11), and read the result. The data is written to the second display memory (9). However, the data for the time counter means (1) is written as is to the first display memory (8) and the second display memory (9). , when the display of the alarm time is instructed by the operation of the switch 4, the calculation means α subtracts the time difference set in the regional counter means (4) from the hour data of the alarm counter means (2). , the result and the minute data are written directly to the second display section (9).

In addition, by operating the switch a3, the regional counter means (
When displaying the month and day of the region set in 4), the arithmetic means section subtracts the hour data of the time counter means (1) and the time difference data of the region counter means (4), resulting in a digit shift. If not, the day data of the time counter means (1) is written as it is in the second display memo (January 9), and when a digit decrease occurs, the day data obtained by subtracting 1 from the day data is written in the second display memo (January 9). 9). of course,
When the result of subtracting 1 from the day data is the previous month, 1 is subtracted from the month data and the data is written into the second display memory (9).

The switch input and control means αυ detects the operation of a plurality of external switches (1a) and controls each circuit and means to realize the function instructed by the switch operation. The watch is equipped with UP and DOWN switches for selecting each region of the world, a home switch for setting the home region, a changeover switch for changing the display, and a correction switch for adjusting the time. When the UP switch or the DOWN switch is operated, the switch input and control means αυ adds 1 to the region counter means (4) and subtracts it to change its contents, that is, the selected region. In addition, the data indicating the time difference set in the region counter means (4) allows the region to be displayed by -1 on, for example, a world map. Further, when the home switch is operated, data indicating the time difference set in the region counter means (4) is transferred to and set in the home region memory means (5).

Next, the operation will be explained with reference to FIG. First, in the time counter means (1), the minute data changes from 59 minutes to 00.
When the minute is reached and a carry to the hour data occurs, a carry process is performed to the hour digit in the time counter means (1). At the same time, the hour data in the first display memory (8) is read out to the arithmetic unit, and "1" is added to the hour data.
The results are again included in the first display memo (January 8). Furthermore, the time data in the second display memory (9) is also read out to the arithmetic means αQ, the addition process of "1" is performed, and the second display memory (9) is read out again.
The display memo is written on January 9). Of course, the minute data of the time counter means (1) is written into the minute data of the first display memory (8) and the display memory (9) of the irises 2 when the second is carried over. Also. Regional counter means (4) by operating the UP switch or DOWN switch
When the time difference data changes, the calculating means αα subtracts the time data of the time counter means (1) and the changed time difference data, and writes the result in the second display memory (9). Therefore, the time of the changed region is displayed on the second display section (7). For example, when the time at the reference location (Unilinton) is 13:40, and the time difference of Tokyo is set to "3" in the area counter means (4), the second display section (7) 10:40 is displayed.

At this time, when the home switch is operated, the time difference "3" set in the region counter means (4) is transferred to and stored in the home region memory means (5). As a result, the calculation means (1 (I) operates, and the time difference between the time data "13" of the time counter means (1) and the home area memory means (5) is "3".
The subtraction process is performed, and the resulting time data "10" is used as the first
is written to the display memory (8). Therefore, 10:40 is displayed on the first display section (6). in this way,
In order to change the time data in the display memory (8) of Ml and the second display memory (9), the arithmetic means (Lω) operates because when a carry from minutes occurs, the regional counter means (4) ) is changed, and when the time difference data is transferred to the home region memory means (5). In particular, the calculation means (11 performs the subtraction process is the region counter means (4). or home region memory means (5
) changes. It goes without saying that the calculation means O1 operates when display switching is instructed by operating the switch (13).

(g) Effects of the Invention As described above, according to the present invention, the home region and each region of the world can be arbitrarily stored using two storage means, the home region memory means and the region counter means, which store the time difference from the reference location. It is possible to specify the first display memory and the second display memory.
Since the operation of rewriting data in the display memory is performed intermittently, there is an advantage that the oil purging power is significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a timing diagram explaining the operation of the block diagram shown in FIG. (1)... Time counter means, (2)... Alarm counter means, (3)... Alarm means, (4
)...region counter means, (5)...home region memory means, (6)...first display section, (7)...
...Second display section, (Death...First display memory, (
9)...Second display memory, a[...Calculating means,
(11)...Switch input and control means, (L7J
···switch. Applicant Sanyo Electric Co., Ltd. and one other representative Patent attorney Masao Sano No. 1: Figure 2 Ikusu 1

Claims (1)

[Claims] 1. In a world clock equipped with a first display section that displays the time of the place of use and a second display section that selectively displays the time of each region of the world, the region including the international date line is the reference point. a time counter means for obtaining time information such as second, minute, hour, month, day, day of the day, etc. as the reference location; a home region memory means for storing the time difference between the reference location and the location of use; a region counter means for specifying a region to be located and storing data representing a time difference with the reference location, and a result of subtracting or adding the time information of the time counter means and the time difference of the home region memory means is written; a first display memory that stores display data to be displayed on the first display section;
a second display memory for storing data to be displayed on the second display section, in which a result of subtraction or addition processing of the time information of the time counter means and time difference data of the region counter means is written; The display memory data is
rewritten when there is a carry from minute to minute and when time difference data is transferred to the home area memory means,
A world clock characterized in that the hour data in the second display memory is rewritten when there is a carry from the minute and when the content of the regional counter means changes.