JPH03181882A - Clock for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicular timepiece, and more particularly to a vehicular timepiece equipped with a hand-type display section having an hour hand driven by a driving means.

(Prior art) Vehicles are often equipped with clocks, but this type of vehicle clock is used under harsher conditions than regular clocks.In other words, vehicles are used in summer or winter. Sometimes cars are left open in outdoor parking lots for long periods of time, and at that time the car is exposed to direct sunlight and the outside temperature, which can cause the clock to become hot or cold, and when driving. This also means that driving vibrations are constantly transmitted to the vehicle.Therefore, vehicle clocks have the problem of being more likely to go awry than regular clocks.

For example, Japanese Patent Application Laid-open No. 59-70
As disclosed in Japanese Patent No. 993, attempts have been made to automatically correct the time display using a time signal included in broadcast waves such as radio broadcasts. According to this, since the time display of the vehicle clock is readjusted every hour, it is possible to use the vehicle clock with an error within a minute range, and there is a hope that it can relieve the user from the trouble of manually setting the time.

(Problems to be Solved by the Invention) Incidentally, in recent years, the awareness of vehicle users has become more luxury-oriented, and with a focus on superior visibility, it has been considered to equip vehicles with clocks equipped with a hand-type display. There is.

However, if a time signal is used to readjust a watch with such a hand-type display, the motor that drives the hour hand of the hand-type display rotates rapidly to adjust the time. However, unlike a digital display type watch, a new problem arises in that the hour hand rotates rapidly, giving a sense of discomfort.

This invention addresses the above-mentioned problem when readjusting a vehicle clock equipped with a hand-type display using a time signal.It is an object of the present invention to make it possible to correct the time using a time signal without causing discomfort. shall be.

(Means for solving !II! [) That is, in the vehicle timepiece according to the present invention, in a configuration including a hand-type display section having an hour hand driven by a drive means, pulses supplied to the drive means are provided. a pulse generating means for generating a signal; an hour hand hourly detecting means for detecting the hour on the hour of the hour hand in the hand-type display section; and a time signal detecting means for detecting a time signal included in broadcast waves such as radio broadcasting; an error detection means for detecting an error between the hour indicated by the time signal detected by the detection means and the hour of the hour hand detected by the hour hand hour detection means; The present invention is characterized by comprising pulse changing means for changing the pulse signal produced by the pulse generating means a predetermined number of times in the direction of eliminating the problem.

(Function) According to the above configuration, the error detection means compares the time difference between the hour indicated by the time signal detected by the hour signal detection means and the hour of the hour hand detected by the hour detection means. Accordingly, the error of the hour hand on the hour with respect to the hour indicated by the time signal is detected.

For example, when a time signal is detected after the hour hand reaches the hour, the control means causes the interval between the pulse signals input to the driving means to be longer than the regular pulse interval by a number of times corresponding to the error. change. As a result, the hour hand rotates at a rotation speed that is slightly slower than the normal rotation speed, and the error is gradually eliminated as time passes. Conversely, when the hour hand indicates the hour after the time signal is detected, the control means changes the pulse signal interval so as to shorten the regular pulse interval by a number of times corresponding to the error between the two pulse signals. In this case, the hour hand rotates at a slightly faster rotation speed than the normal rotation speed, so
The error will gradually disappear over time.

Note that when a type of drive means in which the amount of rotation changes in proportion to the energization time is used, the duration of one pulse is short when the hour hand is moving forward, and the duration of one pulse is short when the hour hand is moving backwards. It may be changed so that it becomes longer.

<Example) Examples of the present invention will be described below.

As shown in FIG. 1, a clock l is a needle hole clock driven by a pulse motor 2, and a control unit 20 of the clock 1 includes a pulse generation circuit that generates pulse signals to be supplied to the pulse motor 2. 21, a pulse changing circuit 22 for changing the interval of pulse signals generated by the pulse generating circuit 21, an hour detecting circuit 23 for detecting the hour on the hand display section 3 of the clock 1, and a pulse signal received by the radio 4. a time signal detection circuit 24 that detects the time signal included in the broadcast waves, and an error on the hour of the clock 1 detected by the hour detection circuit 23 with respect to the time signal detected by the time signal detection circuit 24. and an error detection circuit 25 that detects the error and outputs a pulse interval change signal to the pulse change circuit 22 according to the error.

Now, to explain the time signal detection circuit 24, as shown in FIG.
It has an amplifier 26 that amplifies the audio signal demodulated by the radio 4, and a waveform shaping circuit 27 with a limiter that shapes the audio signal above a certain level into a pulse signal. In this case, when the time signal is broadcast on radio, for example, the third
As shown in the figure, a predetermined time t. (For example, 1.5 seconds) of no signal, followed by three first frequency (=440H2) pulses a...a and one second frequency (=880Hz)
The pulse b is outputted from the waveform shaping circuit 27.

Therefore, the duration of the no-signal state immediately before the first frequency pulse a is outputted to the time signal detection circuit 24 is the time t. a no-signal determination circuit 28 that determines whether or not the
9, a second frequency determination circuit 30 also connected to the no-signal determination circuit 28, a first frequency counter 31 that counts output pulses from the first frequency determination circuit 29, and an output terminal connected to the error detection circuit 25. The connected first AND element 32 and the second AND element 33 whose output terminals are respectively connected to the first and second frequency determination circuits 29, 30, the no-signal determination circuit 28, and the first frequency counter 31 are connected. Further, the first frequency determination circuit 29 is provided with a pulse signal outputted from the circuit 29 as a first frequency pulse a.
A first frequency discriminator 34 is connected which outputs a pulse signal to the first frequency counter 31 when the count value is 1 to 3. A counting discriminator 35 that outputs a pulse signal is connected to one input terminal. The second frequency determination circuit 30 also has a second frequency that outputs a pulse signal to the other input terminal of the first AND element 32 when the pulse signal output from the circuit 30 is a second frequency pulse b. A discriminator 36 is connected. Note that when the pulse signal outputted from the second frequency determination circuit 30 is not at the second frequency, the pulse signal is outputted from the second frequency discriminator 36 to one input terminal of the second AND element 33. It has become. Further, the pulse signal output from the counting discriminator 35 to the first AND element 32 is input to the other input terminal of the second AND element 33.

Therefore, at the output terminal of the first AND element 32,
As shown in FIG. 3, only when three first frequency pulses a and one second frequency pulse b are inputted to the above-mentioned no-signal determination circuit 28 following a certain silent period, as shown in the figure. The time signal pulse rises and is input to the error detection circuit 25, and this pulse signal is passed through the diode 37 to the first and second frequency determination circuits 29, 30, the no-signal determination circuit 28, and the first frequency counter 31. Transmitted and clears the contents.

On the other hand, as shown in FIG.
and second and third shafts which are externally fitted concentrically around the first shaft 5.
The first shaft 5 has a second hand 8, the second shaft 6 has a long hand 9, and the 31st! and 7 have hour hands IO fixed respectively. An input gear 11 is fixed to the second shaft 6, and an output gear fixed to the first shaft 5 is attached to the input gear 11 via first and second intermediate gears 12.13 on separate shafts. 14 are meshed and connected so that the second shaft 6 rotates once while the first shaft 5 rotates 600 times. and,
Small holes 15a and 15b are formed in the output gear 14 and the input gear 11, respectively, so that the second hand 8 and the long hand 9 are arranged in a straight line when they are on the hour, that is, when they are positioned directly above. On both sides of the input and output gears 11 and 14, a light emitting element 16 and an analyzing element 17 are installed in both vehicle holes 15.
They are provided in corresponding positions to a and 15b, respectively.

Therefore, when the second hand 8 and the long hand 9 come to the position indicating the hour, the two car holes 15a and 15b are aligned in a straight line, so that the light emitted from the light emitting element 16 reaches the analyzer element 17. Accordingly, the hour of the hour hand in the hand-type display section 3 is detected.

Furthermore, as shown in FIG. 1, the control unit 20 is equipped with an S counter 38 that monitors the pulse signal supplied to the pulse motor 2, and this S counter 38 converts the pulse signal into one pulse. Each time it counts 60 times, it is reset and a carry signal is output to the M counter 39. This M counter 39 is designed to repeat resetting every time the carry signal is counted 60 times.

This control unit 20 has an ON signal N10 that turns on and off the time signal output circuit n24 and the radio 4.
An FF circuit 40 is provided. This ON10 F
The F circuit 40 monitors the count value of the M counter 39 and sets it to a predetermined count value mo (for example, 57 minutes before the hour).
), an ON signal is output so that the time signal detection circuit 24 and the radio 4 start operating.

Next, the operation of the IIJ control unit 20 will be explained according to the flowchart shown in FIG.

That is, first, in step S1, it is determined whether or not the counted value m of the M counter 39 has reached the set value m,). If it is determined that the radio switch is in the ON state, it is determined in step S2. If it is not in the ON state, an ON signal is output from the 0N10FF circuit 40 to the radio 4 in step S3, and then an ON signal is output from the same <0N10FF circuit 40 to the time signal detection circuit 24 in the Stella 7S4. This causes the radio 4 and the time signal detection circuit 24 to start up and become operational. Note that if the radio switch is in the ON state in step S2, step S is skipped and step S4 is executed.

Next, in step S5, it is determined whether the second hand 8 and minute hand 9 in the hand-type display section 3 have reached the position indicating the hour based on the signal input from the analyzer element 17 to the hour detection circuit 23. will be held. When it is determined that it is on the hour, the hour detection circuit 23 outputs a reset signal to the S counter 38 and the M counter 39 in step S6, and at the same time, the built-in timer of the error detection circuit 25 starts, and then in step S8 the error is detected. Time signal detection circuit 24 to detection circuit 25
It is determined whether or not a time signal has been inputted. At the time when the time signal has been input, step S9 is executed, and the error detection circuit 25 determines, for example, that the pulse period P+ is 1.01 times the reference pulse τ0. The signal is outputted to the pulse changing circuit 22, and at the same time, in step S+s, the deviation of the hour on the hour from the time signal is calculated from the operating time of the timer, and at the same time, the timer is reset in step S16. Then, in step S17, the pulse change state is maintained according to the deviation. As a result, the pulse motor 2 rotates at a rotation speed that is slightly slower than the normal rotation speed, and the second hand 8, long hand 9, and short hand 10 in the hand-type display section 3 rotate without causing any discomfort. , the error will gradually disappear as time passes.

Further, in step 5llB, it is determined whether or not the radio switch is in the OFF state, and when it is in the OFF state, an OFF signal is output to the radio 4 in step SI9, and the OFF signal is output to the radio 4 in step SI9.
If it is not in the F state, the radio 4 is maintained in the ON state. Note that at this time, an OFF signal is also output to the time signal detection circuit 24.

On the other hand, if it is determined in step S5 that the second hand 8 and the long hand 9 are not at the hour position, the process moves to the stick SIO, and it is determined whether or not a time signal has been input, and the point at which the time signal has been input is determined. In step SI2, the timer is started, and in the following step S12, it is again determined whether it is on the hour. Then, at the hour on the hour, a reset signal is output to the S counter 38 and the M counter 39 in the same way as in step S6, and in step SI4, the pulse period Pl is changed to 0.0 of the reference pulse τ0.
A change signal is output from the error detection circuit 25 to the pulse change circuit 22 so as to multiply the pulse by 99 times.

Then, each processing operation in steps S15 to S19 described above is executed. As a result, the pulse motor 2
rotates at a rotation speed slightly faster than the normal rotation speed, and the second hand 8 in the hand-type display section 3 rotates at a rotation speed slightly faster than the normal rotation speed.
, the long hand 9, and the short hand 10 rotate without causing any discomfort, and the errors are gradually eliminated as time passes.

(Effects of the Invention) As described above, according to the present invention, in a vehicle clock equipped with a hand-type display section having an hour hand driven by a driving means, the time signal can be used to ensure accurate time at all times. At the same time, the pulse signal is changed in a direction that gradually eliminates the error with respect to the time signal.
It doesn't make you feel uncomfortable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a block circuit diagram showing a vehicle clock and its control unit, FIG. 2 is a system diagram of the control of the time signal detection circuit, and FIG. The waveform diagram shown in Fig. 4 is the main part configuration diagram of the needle type display section.
FIG. 5 is a flowchart of overall control in this embodiment. 2...Pulse motor, 3...Needle type display, 8°9.
10...Hour hand (8...Second hand, 9...Long hand, 10...
. . . hour hand), 21 . . . pulse generation means (pulse generation circuit), 17.23 . . . hour hand hourly detection means (17 . .
Analyzing element, 23... Hourly detection circuit, 22... Pulse changing means (pulse changing circuit), 24... Time signal detection means (time signal detection circuit) 25... Error detection means circuit)

Claims (1)

[Claims] (1) A vehicle clock equipped with a hand-type display section having an hour hand driven by a drive means, comprising a pulse generating means for generating a pulse signal to be supplied to the drive means, and an hour hand in the hand-type display section. an hour hand on the hour detecting means for detecting the hour on the hour; a time signal detecting means for detecting a time signal included in a broadcast wave such as a radio broadcast; an error detection means for detecting an error between the hour hand and the hour detected by the hour detection means; and a pulse signal generated by the pulse generation means a predetermined number of times in a direction to gradually eliminate the error detected by the detection means. A vehicle clock characterized in that it has pulse changing means for changing the pulse.