JPS6236190B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a time detection device.

For example, when electronically controlling the number of times reported by a time signal clock with an analog display, it is necessary to synchronize the time number counter and the displayed time. One example is one in which a disk is attached to the hour hand shaft, a 4-bit code pattern for each time from 1 o'clock to 12 o'clock is formed on the disk, and a brush is brought into elastic contact to detect each time. According to this, four brushes for code detection and a common brush are required, which increases the number of contacts, which is not desirable in terms of reliability and configuration.

Moreover, the integrated circuit containing the counter had to be provided with four pins for code input.

SUMMARY OF THE INVENTION Accordingly, the present invention aims to read code patterns with a simple configuration, improve reliability, reduce the number of input terminals to the circuit, and eliminate the conventional drawbacks.

An embodiment of the present invention will be described below based on the drawings. In FIG. 1, A is a disk fixed to an hour hand shaft (not shown), and has code patterns _P0 ... _P11 representing each time from 0:00 to 11:00 formed thereon.
Each code pattern consists of 4 bits, and bits _b0 ... _b3 are weighted ²⁰ , ²¹ , ²² , and ^23, respectively. Electrodes are formed on the hatched bits using a conductive material, and each electrode is electrically connected to a common electrode c. A contact piece _t1 is in elastic contact with the common electrode c and connected to the positive side of the power source.
The contact pieces t ₂ and t ₃ that constitute the bit detection device are in elastic contact with the inner and outer peripheries of the code pattern, respectively, and are connected to the negative side of the power supply via the resistors r ₁ and r ₂ shown in Fig. 2, respectively. There is.

In FIG. 2, F ₁ and F ₂ are flip-flop circuits constituting a memory circuit, L is a latch circuit, and V is an inverter, which are integrated.
q ₁ and q ₂ are terminals for inputting the code.

In the above configuration, the positioning is performed in advance during assembly so that when the displayed time is 11:30, the disk A in FIG. 1 is at the position shown in the same figure. That is, the contact pieces t ₂ and t ₃ are in elastic contact with the bits b ₀ and b ₂ , respectively. When 12:00 is displayed after 30 minutes have elapsed, the disk A rotates 1/24 and becomes the state shown in the third diagram, and the contact pieces t ₂ and t ₃ change to bits b ₁ and b ₃ respectively. comes into ballistic contact with. In this way, due to the rotation of disk A , the contact piece
Outputs at t ₂ and t ₃ are generated as shown in FIG. 4, B and C, respectively. The outputs of the contacts t ₂ and t ₃ are supplied to the flip-flop circuits F ₁ and F ₂ of FIG. 2, as well as to the latch circuit L.

On the other hand, input terminals a of the flip-flop circuits F ₁ and F ₂ are connected to, for example, a minute hand cam (not shown) or the like.
As shown in Figure 4A, a pulse is supplied that rises at 30 minutes every hour and falls at the hour. Therefore, the outputs of the contacts t ₂ and t ₃ at 30 minutes every hour are written to the flip-flop circuits F ₁ and F ₂ by the rising edge of the pulse. Therefore, the flip-flop circuit
Outputs Q of F ₁ and F ₂ are generated as shown in FIG. 4 D and F, respectively, and are supplied to terminals l ₁ and l ₂ . Further, the outputs of the contact pieces t ₂ and t ₃ are directly supplied to the terminals l ₁ and l ₃ . Therefore, at 12:00, the terminal
Detection outputs of bits b ₁ and b ₃ from contact pieces t ₂ and t ₃ are generated at l ₁ and l ₃ , respectively.

i.e. at 11:30 and 12:00
Detection outputs of bits b ₀ and b ₂ generated in series starting from t ₂ are generated at terminals l ₀ and l ₁ , respectively, and are converted into 2-bit parallel outputs. Similarly, 11:30 and
At 12:00, the detection outputs of bits b ₁ and b ₃ generated in series from contact t ₃ are output to terminals l ₂ and l _3, respectively.
It is generated in parallel and converted into a 2-bit parallel output. As a result, terminals l ₀ to l ₃ output 4, which represents 12 o'clock.
Bit code output occurs.

This code output is latched by the latch circuit L when the pulse at the terminal a falls at 12 o'clock.

In this way, for example, code outputs representing times (1000) at 1 o'clock and (0100) at 2 o'clock are output from terminals l ₀ to
This occurs in parallel from l ₃ .

In this way, every hour on the hour, each bit of the code pattern corresponding to that hour is generated in parallel from terminals l ₀ to _{l 3} , resulting in a code output representing that time, which is used to control the number of times reported, etc. It is something.

By the way, when disc A is downsized, the contact piece
Although it is no longer possible to provide t ₂ and t ₃ close to each other as shown in FIG. 1, in this case, the inner and outer bits are offset from each other as shown in FIG. In the figure, since the inner circumference and the outer circumference are shifted by 90 degrees, the contact pieces t ₂ and t ₃ can be sufficiently spaced apart.

In addition, in the above embodiment, the bits constituting each code pattern are divided into two cycles, but the present invention is not limited to this.
One circumference may be divided into 48 parts and the code patterns for each time may be arranged in series. In this case, each bit may be sequentially written into the shift register using pulses with a 15-minute period from a minute hand cam or the like.

Further, in the above embodiment, the bits are detected by the contacts and electrodes, but they may be detected by, for example, a photocoupler or the like.

Further, the rotating body is not limited to the disk as described above, but a drum may be used, and in this case, a code pattern is formed on the circumferential surface of the drum.

Further, in the above embodiment, the case where the present invention is used in a hand display type timepiece is described, but the present invention may also be used in a leaf type or drum type digital display timepiece.

As described in detail above, according to the present invention, a plurality of bits are arranged side by side on the same circumference to form a code pattern of time data, and the bits on the same circumference are serially detected by a common bit detection device. Since the detection output of the upper bit is converted to a parallel output to generate a code output representing the time, the number of bit detection devices such as contacts can be reduced, simplifying the configuration and increasing the reliability of time data reading. Improves sex. Furthermore, the number of input terminals to a circuit that integrates a conversion circuit or the like can be reduced.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an embodiment of the present invention, Figure 2 is an electric circuit diagram showing an example of the circuit configuration of the present invention, and Figure 3 is a 1/24 rotation of the disk in Figure 1. FIG. 4 is a plan view showing the state, FIG. 4 is a time chart for explaining the operation, and FIG. 5 is a plan view showing another embodiment. A ...Disk, _P0 to _P11 ...Code pattern, _b0 to _b3
…Bits, _t1 to _t3 …contacts, _F1 , _F2 …flip-flop circuits, _l0 to _l3 …terminals.

Claims (1)

[Scope of Claims] 1. A rotating body that rotates in conjunction with a time display section; A time data code pattern formed by arranging a plurality of bits in parallel on at least one circumference of the rotating body; A bit detection device is provided at a position corresponding to the circumference and detects the above-mentioned bit, and a storage circuit whose detection output from this bit detection device is used as data input and a pulse generated in synchronization with the rotation of the above-mentioned rotating body is used as clock input. A time detection device comprising: converting the output of the storage circuit and the detection output from the bit detection device into parallel outputs to generate a code output representing time.