JPH04328491A - Time indicator - Google Patents

Abstract

PURPOSE:To delete the work for oscillator frequency control and correct time shift automatically by deleting a variable resistance for oscillator frequency control. CONSTITUTION:Present time is measured at a clock part 11 and the measured present time is indicated at a time indicator 12. In a time correction setter 13, the corrected time in every predetermined interval is set. A time correction part 14 watches whether the predetermined time has lapsed with reference to the present time measured at the clock part 11. If it has lapsed, the present time in the clock part 11 is corrected for the time set in the time correction setter 13.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a time display device.
In particular, the present invention relates to a time display device having a programmable time correction function.

0002

2. Description of the Related Art Video equipment, telephones, facsimile machines, etc. are equipped with clocks that display the current time. In such a timepiece, the variable resistance value is adjusted by an adjustment knob at the time of shipment or at the user's end, and the oscillation frequency is adjusted to a specified frequency to prevent time errors. Furthermore, when the oscillation frequency fluctuates and the time advances or lags behind, the variable resistance value is adjusted using an adjustment knob to match the oscillation frequency to a specified frequency.

0003

[Problems to be Solved by the Invention] In such conventional time adjustment methods, it is necessary to adjust the time using a variable resistor and its adjustment knob, and the oscillation frequency varies depending on the usage environment. need to be adjusted. However, adjusting the oscillation frequency to avoid time lag is troublesome, and there is a problem in that it cannot be adjusted accurately. In particular, since the user adjusts the time appropriately depending on whether the time is late or ahead, the user is unable to make the adjustment correctly and must perform the adjustment work many times.

From the above, it is an object of the present invention to provide a time display device that does not require a variable resistor for adjusting the oscillation frequency and can use a fixed resistor, thereby eliminating the need for adjusting the oscillation frequency and automatically correcting time lag. The goal is to provide the following.

[0005]

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle of the present invention. 11 is a clock unit that measures the current time; 12 is a time display unit that displays the current time measured by the clock unit; 13 is a correction time setting unit that sets a correction time for each predetermined time (for example, one day); This is a time correction unit that corrects the current time of the clock unit by the set time every predetermined time.

[0006]

[Operation] The clock section 11 measures the current time, and the time display section 12 displays the measured current time. Also, correction time setting section 1
Step 3 sets the correction time for each predetermined time. Time correction section 14
monitors whether a predetermined time has elapsed by referring to the current time measured by the clock section 11, and when it has elapsed, corrects the current time of the clock section 11 by the time set by the correction time setting section 13. In this way, set the correction time for each predetermined time,
Since the current time is automatically corrected at each predetermined time, there is no need for a variable resistor for adjusting the oscillation frequency.Therefore, there is no need to adjust the oscillation frequency. can automatically correct the time difference.

Further, the clock section 11 monitors the current time as well as the day of the week or date, and the time correction section 14 also monitors the day of the week or date, so that the day of the week or date monitored by the clock section 11 and the time correction section 14 monitor. When the day of the week or date is different, the time correction unit 14 corrects the current time of the clock unit 11 by the set time, and if configured to advance the day of the week or date that it monitors by one day, the time correction unit 14 automatically changes the current time by one day. You can adjust the time once per day.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Overall Configuration FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In the figure, 11 is a clock unit that measures the current time, 12 is a time display unit that displays the current time measured by the clock unit, and 13 is a switch configuration that sets a correction time for each predetermined time (for example, one day). Correction time setting section, 1
Reference numeral 4 denotes a time correction section configured with a microcomputer that corrects the current time of the clock section every predetermined time (for example, one day), and includes a processor (CPU) 14a that performs time correction processing, which will be described later, and a program memory that stores a time correction program ( ROM) 14b
, battery-backed data memory (RAM)
) 14c, interface unit for exchanging data with the outside (
I/F) 14d.

[0009] 15 is a power supply control section, and 16 is a battery. The power supply control unit 15 monitors the level of the power supply voltage Vcc, and when the level falls below a set level due to power off, etc., the voltage from the battery 16 is transferred to the clock unit 11 and the data memory (RAM) 14c.
The clock section 11 continues to measure the time, and the data memory 14c retains the stored contents. Note that when the power is turned off, the processor 14a of the time correction section 14 stops processing.

Clock Section As shown in FIG. 3, the clock section 11 includes an oscillator 11a that oscillates at a constant frequency, a counter 11b that counts pulses output from the oscillator, and a date, day of the week, and current time based on the count value of the counter 11b. It has a date and time monitoring unit 11c that calculates and holds the date and time.

Correction time setting section The correction time setting section 13 is composed of switches as shown in FIG. 4, including a time correction on/off switch 13a for setting whether or not to perform time correction, and a time correction on/off switch 13a for setting whether or not to perform time correction. , a correction direction switch 13b for setting whether to delay or not, a preliminary switch 13c, and the 10th digit of the correction time (00 seconds to 50 seconds).
Three 10-digit time switches 13d for setting in binary numbers
and four first digit time switches 13e for setting the first digit (0 seconds to 9 seconds) of the correction time in binary numbers. still,
The correction time setting section 13 can also be configured to display a menu on the time display section 12 to set time correction on/off, correction direction, and correction time.

Overall operation FIG. 5 is a flowchart of time correction control according to the present invention. Hereinafter, time correction control will be explained according to this flowchart. Note that the correction shall be made once per day.

The processor 14a of the time correction section 14 reads the current time from the clock section 11 at a predetermined timing and stores it in the data memory 14c, and also inputs the current time into the time display section 12 for display.

In parallel with the above control, the processor 14a
refers to the on/off status of the time correction on/off switch 13a and determines whether or not it is necessary to perform time correction (
Step 101).

If the time correction on/off switch 13a is off, there is no need to correct the time, so the day of the week or date monitored by the clock section 11 and the day of the week or date monitored by the time correction section 14 (data memory 14c) match (step 102).

If they match, the correction process is completed without updating the day of the week and date; if they are different, in other words, if 12 o'clock midnight has passed, the day of the week and date are advanced by one day and stored in the data memory. 14c, and the correction process ends (step 103).

On the other hand, if the time correction on/off switch 13a is on in step 101, it is determined whether the day of the week (or date) monitored by the clock section 11 and the day of the week (or date) monitored by the time correction section 14 match. A judgment is made (step 104). If they match, it is not yet the time to correct the current time, and the correction process ends.

However, after 12 o'clock midnight has passed,
If it is the first current time reading timing, the day of the week is different, and the result in step 104 is "YES". Next, the processor identifies whether to advance or delay the time by referring to the on/off state of the correction direction switch 13b (step 1).
05), to advance, switch 13d, 1 at the current time.
Add the correction time Tc set in step 3e (step 1
06), when delaying, subtract the correction time Tc from the current time (step 107), and set the clock section 11 at the calculated time.
The current time is corrected (step 108).

Next, the day of the week and date are advanced by one day and stored in the data memory 14c (step 109), and after that, the day of the week or date monitored by the clock section 11 and the day of the week or date monitored by the time correction section 14 match. (Step 11)
0), if they match, the time correction process ends.

However, if the days of the week or dates do not match, the processes from step 105 onwards are repeated until they match. If the power is on continuously, when the day of the week and date are advanced by one day in step 109, the clock section 11
The day of the week or date monitored by the time correction section 14 coincides with the day of the week or date monitored by the time correction section 14. However, if the power is turned off, the clock unit 11 is supplied with voltage from the battery 16 and continues to measure time, advancing the day of the week and date, but the processor 14a of the time correction unit 14 stops processing and data The day of the week and date stored in the memory 14c do not advance (the day of the week and date when the power was turned off are retained). Therefore, if the power is turned off, the day of the week or date of the clock section 11 and the day of the week or date of the time correction section 14 may deviate by two or more days. Even if the clock advances, the day of the week or date monitored by the clock section 11 and the day of the week or date monitored by the time correction section 14 do not match. Therefore, the processes from step 105 onward are repeated until they match, and the time is corrected by the number of days that are different to correct the current time.

[0021] In the above description, the time is corrected once per day, but the present invention is not limited to one day, but can also be configured to be corrected every predetermined period of time (for example, 12 hours). Although the present invention has been described above with reference to examples, the present invention can be modified in various ways according to the gist of the present invention as described in the claims, and the present invention does not exclude these modifications.

[0022]

[Effects of the Invention] According to the present invention, since the correction time is set for each predetermined time and the current time is automatically corrected for each predetermined time, there is no need for a variable resistor for adjusting the oscillation frequency. Therefore, there is no need to adjust the oscillation frequency, and the time difference can be automatically corrected from then on simply by setting the correction time.

Further, according to the present invention, the clock section monitors the day of the week or the date as well as the current time, the time correction section also monitors the day of the week or the date, and the time correction section monitors the day of the week or date monitored by the clock section. When the day of the week or date is different,
The time correction unit is configured to correct the current time of the clock by the set time and advance the day of the week or date that it monitors by one day, so it automatically corrects the time once per day. can do.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a configuration diagram of a clock section.

FIG. 4 is a configuration diagram of a correction time setting section.

FIG. 5 is a flowchart of time correction control according to the present invention.

[Explanation of symbols]

11...Clock part 12...Time display section 13. Correction time setting section 14...Time correction section

Claims (2)

[Claims] 1. A clock unit that measures the current time, a time display unit that displays the current time measured by the clock unit, a correction time setting unit that sets a correction time for each predetermined time, and a correction time setting unit that sets a correction time for each predetermined time. A time display device comprising a time correction section that corrects the current time of a clock section by the set time. 2. The clock unit monitors the day of the week or the date as well as the time, the time correction unit reads and stores the current time measured by the clock unit, and monitors the day of the week or the date,
When the day of the week or date monitored by the clock section and the day of the week or date monitored by the time correction section are different, the time correction section corrects the time of the clock section by the set time and adjusts the day of the week or date it monitors to 1. 2. The time display device according to claim 1, wherein the time display device advances the day.