JP2006153721A - Clock device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clock device capable of suppressing delays due to arithmetic operations and correcting its clock time. <P>SOLUTION: The clock device 100 is equipped with an indicator 105 for indicating the clock time; a drive means 104 for driving the indicator 105; a reception means 103 for receiving a standard wave having clock time information; and a control means 101 which counts a reference clock signal to obtain the clock time, outputs a clock time signal to the drive means 104 at a prescribed period, corrects the clock time based on the clock time information received through the reception means 103 and outputs the clock time signal to the drive means 104. After correcting the clock time based on the clock time information, the control means 101 detects a position marker PO in a time code carried by the standard wave and outputs the clock time signal to the drive means 104 at a period shorter than the prescribed period by a prescribed time, such that the clock time signal is output in approximate synchronism with a marker M transmitted after the position marker PO. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a timepiece device that informs a user of a time, and more particularly to a timepiece device that receives a standard radio wave including time information and adjusts the time.

  Currently, the National Institute of Information and Communications Technology transmits time codes using long wave (40 and 60 kHz) standard radio waves. There is a clock device that receives a standard radio wave including time information called a time code and adjusts the time. As the time code of the standard radio wave, a 60-bit time code including time information of minute, hour, day of total from January 1, year, day of the week, and leap second is transmitted at a timing of 60 seconds per cycle.

The timepiece device demodulates the received standard radio wave to obtain a rectangular pulse, performs a calculation process for detecting time information from the rectangular pulse, and corrects the time according to the time information obtained by the calculation. .
Japanese Patent Laid-Open No. 10-82873

  In order to perform the arithmetic processing such as the demodulation of the standard radio wave described above, a processing time of 20 milliseconds to 100 milliseconds and an average of about 40 milliseconds is required. Thus, there has been a problem that the arithmetic processing of the timepiece device is delayed and consequently the display is delayed.

  Accordingly, the present invention aims at proposing a timepiece device capable of correcting the time while suppressing the delay caused by the arithmetic processing, paying attention to the above-mentioned problems.

  In order to solve the above-mentioned problem, the present invention, like the timepiece device according to claim 1, is a display for notifying time, a driving means for driving the display, and reception for receiving a standard radio wave including time information. A time signal is obtained by counting a reference clock signal and outputting a time signal to the driving means at a predetermined period, and correcting the time based on time information received via the receiving means And a control device for outputting a signal, wherein after the control device corrects the time based on the time information, a time signal is sent to the drive device at a cycle shorter by a predetermined time than the predetermined cycle. Output.

  Further, as in the timepiece device described in claim 2, the display device for notifying the time, the driving means for driving the display device, the receiving means for receiving the standard radio wave including the time information, and the reference clock signal are counted. And a control unit that outputs a time signal to the driving unit at a predetermined cycle and corrects the time based on time information received through the receiving unit and outputs the time signal to the driving unit. In the timepiece device, after the control means corrects the time based on the time information, the position marker P0 in the time code of the standard radio wave is detected, and almost the same as the marker M transmitted after the position marker P0. A time signal is output to the drive means at a cycle shorter by a predetermined time than the predetermined cycle so as to be simultaneously.

  In addition, as in the timepiece device described in claim 3, the display for notifying the time, the driving means for driving the display, the receiving means for receiving the standard radio wave including the time information, and the reference clock signal are counted. And a control unit that outputs a time signal to the driving unit at a predetermined cycle and corrects the time based on time information received through the receiving unit and outputs the time signal to the driving unit. A timepiece device in which the control unit detects a marker M in the time code of the standard radio wave after the control unit corrects the time based on time information, and is transmitted after the marker M. A time signal is output to the drive means at a cycle shorter by a predetermined time than the predetermined cycle so as to be substantially the same as the cycle signal.

  The present invention can provide a timepiece device capable of correcting the time while suppressing a delay associated with the arithmetic processing.

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

  FIG. 1 is a block diagram of a timepiece device 100. Here, an example in which a timepiece device is integrated into an instrument device for a vehicle will be described. The timepiece device 100 includes control means 101 composed of a microcomputer that controls the timepiece device 100 (performs processing operations described later), an antenna 102 for receiving standard radio waves, a reception means 103, and vehicle interface terminals 109a to 109a. 109e, vehicle interface means 108, digital display 105 including a liquid crystal display element or an organic EL display element for displaying time, accumulated distance (odd, trip), etc., speedometer (SP), engine rotation Various measuring instruments 106 such as a meter (TA), driving means 104 for the display 105 and various analog measuring instruments 106, the storage means 107 for storing the control means 101, each time of receiving the standard radio wave, etc., and the reference of the control means 101 It is mainly composed of a crystal resonator 112 that generates a clock signal.

  The vehicle interface terminals 109a to 109c are connected to respective signal lines so that an ignition key ON signal (injection signal), an instruction signal from the operation means, and other vehicle information (a plurality of pieces) are input and output. A battery and GND are connected to the vehicle interface terminals 109d and 109e. The battery 109d and the GND 109e are connected to the power supply means 110 and supply a predetermined voltage into the timepiece device 100. The reset means 111 generates a reset signal when the battery 109d shifts from the non-contact state to the contact state. To do.

  The processing operation of the control means 101 of the timepiece device 100 will be described in detail. The control means 101 counts the reference clock signal emitted from the crystal oscillator 112 to obtain the time, and displays the time obtained by the counting process on the display unit 105 via the driving means 104. Then, the control means 101 transmits a standard radio wave including time information via the antenna 102 and the receiving means 103 every predetermined time (here, 2 am, 4 am, 2 pm, 4 pm). Receive.

  Next, a time correction method will be described with reference to FIGS. The control means 101 starts time correction processing at a predetermined time (S1). It is determined whether the time data (radio wave) received for at least 2 minutes (2 cycles) is normal (S2). If normal, the process proceeds to S3, and if not normal, the process proceeds to S4. Here, the case of proceeding to S4 will be described. The reception time is a predetermined time for suppressing battery consumption. When this time has elapsed, the reception is terminated (S7), and the time correction processing is performed. Is finished (S9). If the time has not elapsed, the reception is continued (S8), and the process returns to S2.

  Here, the description returns to the case of proceeding from S2 to S3. If the time data received at S2 is normal, the control means 101 uses the position marker P0 in the time code of the standard radio wave (usually corresponding to the rise of 59 seconds of the time code, changing 1 second before and after by leap seconds) Is detected (S3). If the position marker P0 can be detected, the process proceeds to S4 and the internal clock of the control means 101 is corrected. As shown in FIG. 3, the clock correction calculation processing up to this point is that the time correction processing elapses as shown in (C) with respect to the rising edge of the standard radio wave position marker P <b> 0 in (A). It has been. Here, the control means 101 normally outputs a signal to the drive means 104 that drives the display 105 at a predetermined cycle, as shown in FIG. To do.

  The predetermined period is 1 second, and a rectangular wave signal with a duty ratio of 50%. When the rising of this signal is detected, the control means 101 outputs a time signal to the drive means 104. For this reason, even if the control means 101 detects P0 of the standard radio wave and corrects the time, if the time signal is output to the drive means 104 at a normal cycle, the standard radio wave marker M (time code every minute) Corresponding to the rise of 0 seconds) At the time of reception, the display on the display unit 105 is shifted.

  Therefore, in the present embodiment, as shown by (D) in FIG. 3, for the predetermined period for outputting the time signal to the driving means 104, the time is received after receiving the standard radio wave position marker P0. A time signal is output to the drive means 104 only once in a cycle shorter by a predetermined time t required for the correction process (S5). The predetermined time t is a time for calculating the standard radio wave, and is from the rise of the standard radio wave in FIG. 3 to the fall indicating the end of the time correction process. In terms of time, it is 40 milliseconds on average. In this embodiment, this 40 milliseconds is set as the predetermined time t. By doing so, it is possible to suppress the delay associated with the arithmetic processing, suppress the delay of the display on the display unit 105 when receiving the standard radio wave marker M, and display the time together. Then, the time correction process is terminated (S9).

  In the embodiment, the time signal is sent to the driving means 104 at a cycle shorter by a predetermined time than the predetermined cycle so as to be almost the same as the marker M transmitted after the position marker P0 in the time code of the standard radio wave. However, the present invention is not limited to the above-described embodiment, and the marker M in the time code of the standard radio wave is detected, so that the signal transmitted at a period of 1 second after the marker M is almost simultaneous. In addition, a time signal may be output to the driving unit 104 at a cycle shorter by a predetermined time than the predetermined cycle. Also, the time when the time signal is output to the driving means 104 at a cycle shorter than the predetermined cycle by a predetermined time is not limited to the standard radio wave signal immediately after the marker M, and is transmitted, for example, after a few seconds. It may be adjusted to a signal or may be adjusted to one of several position markers transmitted after the marker M.

  In the above-described embodiment, the instrument device 100 is integrated into the instrument device for a vehicle, but is not limited to the above-described example, and may be configured only with a timepiece device.

The block diagram which shows the timepiece apparatus of embodiment of this invention. The figure explaining the time correction process of the timepiece device. The figure explaining the timing of operation | movement of the timepiece device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Clock apparatus 101 Control means 102 Antenna 103 Receiving means 104 Driving means 105 Display device 107 Storage means 109a-109e Vehicle interface terminal 112 Crystal oscillator

Claims (3)

A display for notifying the time, a driving means for driving the display, a receiving means for receiving a standard radio wave including time information, a reference clock signal is counted to determine the time, and a time signal is sent to the driving means at a predetermined cycle. And a control unit that outputs a time signal to the driving unit by correcting the time based on the time information received and received via the receiving unit, the control unit based on the time information Then, after correcting the time, a time signal is output to the driving means at a cycle shorter by a predetermined time than the predetermined cycle. A display for notifying the time, a driving means for driving the display, a receiving means for receiving a standard radio wave including time information, a reference clock signal is counted to determine the time, and a time signal is sent to the driving means at a predetermined cycle. And a control unit that outputs a time signal to the driving unit by correcting the time based on the time information received and received via the receiving unit, the control unit based on the time information After correcting the time, a position marker P0 in the time code of the standard radio wave is detected, and a predetermined time with respect to the predetermined period is set to be almost the same as the marker M transmitted after the position marker P0. A timepiece device that outputs a time signal to the driving means at a short cycle. A display for notifying the time, a driving means for driving the display, a receiving means for receiving a standard radio wave including time information, a reference clock signal is counted to determine the time, and a time signal is sent to the driving means at a predetermined cycle. And a control unit that outputs a time signal to the driving unit by correcting the time based on the time information received and received via the receiving unit, the control unit based on the time information After the time is corrected, the control means detects the marker M in the time code of the standard radio wave, and the predetermined period is set to be substantially the same as the signal of the one-second period transmitted after the marker M. The timepiece device outputs a time signal to the driving means at a cycle shorter than a predetermined time.

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