JPS588725B2 - Moving object detection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a detection device for a moving object.

For example, in an analog display type watch, when the hands are automatically set to a desired time, it is necessary to detect the displayed time, that is, the indicated position of the hands.

However, when trying to detect the time in one-minute increments, an operating element (such as a permanent magnet) is attached to a rotating body that rotates in conjunction with the minute hand.
It is necessary to arrange a sensor and 60 detection elements (for example, a reed switch) to face it, which is complicated in structure and becomes an obstacle in downsizing.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a detection device for a moving object that requires half the number of detection elements compared to the conventional method, thereby eliminating the conventional drawbacks.

An embodiment of the present invention will be described below based on the drawings.

In Fig. 1, reference numerals 1...6 are fixed plates, fixed plates 1, 2, 4, and 5 are fixed by pillars 7 and 8, and fixed plates 3 and 6 are fixed plates, respectively. It is fixed at 4 and 5.

Rotors 9 and 10 for driving the hour hand and minute hand are rotatably fixed between the fixed plates 1 and 2 and the fixed plates 4 and 5, respectively.

11 and 12 are stators, and 13 and 14 are drive coils.

Numerals 15 and 16 are pinion pinions fixed to the shafts of the rotors 9 and 10, respectively, 17.18 are gears meshing with the pinion pinions 15 and 16, respectively, gear 17 is a boss fixed to the hour hand shaft 19, and gear 18 is a boss fixed to the minute hand shaft 20. It is fixed to 21.

Additionally, bosses 22 are provided on the hour hand shaft 19 and the minute hand shaft 20, respectively.
．． 23 is fixedly attached thereto, and rotary needles 24, 25 constituting a movable body are fixedly attached to each boss 22, 23, respectively.

The rotating hands 24, 25 correspond to the indicated positions of the hour hand 27 and minute hand 26, respectively.

Permanent magnets 28 and 29, which are actuating elements, are fixed to the tips of the rotating needles 24 and 25, respectively.

Also, a reed switch 30 constituting a detection element is placed on the fixed plates 3 and 6 facing the permanent magnets 28 and 29.
...30.31...31 are arranged.

As shown in the second diagram, 36 reed switches 30 are arranged at the indicated positions of the hour hand 27 corresponding to 0, 20.40 minutes per hour on the fixed plate 3, The reed switch 31...31 is set to the indicated position of the minute hand 26 corresponding to 0, 2, 4...58 minutes on the fixed plate 6 as shown in the third diagram. There are 30 of them.

In FIG. 4, 32 is a clock pulse generator consisting of a crystal oscillator and a frequency divider, 33 and 34 are minute and hour counters, respectively, 35 and 36 are control circuits to be described later, and 37.
38 is an encoder.

39 and 40 are comparison circuits, and 41 and 42 are drive circuits for driving the coils 13 and 14 in FIG. 1, respectively.

FIG. 5 shows the control circuit 35 of FIG. 4, in which G1...G6o is a gate circuit, and gate circuit G1...G3o constitutes the first gate circuit, and gate circuit G31...
- G60 constitutes a second gate circuit.

■1...V3o is an inverter.

In addition, the reed switch 31 shown in the same figure...3
1 is sequentially 0, 2, 4 from the top of the drawing...
This corresponds to the 58th minute position.

The control circuit 36 also has the same configuration as that shown in FIG. 5. Next, the operation will be explained.

Counters 33 and 34 in FIG. 4 count minutes and hours, respectively, and their respective outputs are fed to matching circuits 39, 40.

The matching circuits 39 and 40 cause the counters 33 and 34 to
1 and the time displayed by the minute hand 26 and hour hand 27 in FIG. 1. First, the displayed time is detected as follows.

Assuming that 12 o'clock OO minutes is being displayed now, the rotary hand 25 is connected to the reed switch 31 installed at the θ minute position as shown in FIG.
Only this reed switch 31 is turned on by the magnet 29.

In other words, only the uppermost reed switch 31 in FIG. 5 is turned on, and the other reed switches 31...3
1 is off.

Therefore, the outputs of the gate circuits G1...G3o are all held at "1", and the output terminal P of the gate circuit G31.

only terminal is set to "1", other terminals P2...P5
9 are all held at "0".

This is converted into a binary coded decimal code by the encoder 37 in FIG. 4, and the code output is supplied to the matching circuit 39.

If the counter 33 is now counting one minute, for example, the contents of the counter 33 and the output of the encoder 37 do not match, and the output of the coincidence circuit 39 at this time causes an output from the drive circuit 41, as shown in FIG. is supplied to the coil 14 of.

As a result, the mouth gear 10 rotates, and the pinion 16 and the gear 1
8, the minute hand shaft 20 rotates, and the minute hand 26 and rotating hand 25 rotate.

When the minute hand 26 indicates 1 minute, the rotating hand 25 also moves to the 6th position.
Indicate the 1 minute position as shown.

The magnet 29 therefore turns on the reed switches 31.31 in the 0 minute and 2 minute positions.

In other words, the upper two reed switches 31 and 31 in FIG. 5 are turned on, and only the output terminal P1 of the inverter V1 is turned on.
"become.

Since this output is encoded by the encoder 37 in FIG. 4 and matches the contents of the counter 33, the output from the matching circuit 39 is stopped and the output from the drive circuit 41 is stopped.

As described above, the minute hand 26 becomes 0.1.2...
...When 59 minutes is specified, terminal P in Figure 5 is activated.

P59 is sequentially set to "1", which is converted into a binary coded decimal code by the encoder 37, and minute detection is performed.

By the way, the indicated position of the hour hand 27 is detected in the same manner as described above, but in this example, the reed switch 30 is set to the position indicated by the hour hand 2 as shown in the second figure.
7 at designated locations every 20 minutes.

For 0, 20.40 minutes, turn on only the reed switch 30 provided at the indicated position, and for 10, 30.50 minutes, turn on both reed switches 30.30 on both sides of the hour hand. is detected every 10 minutes.

Therefore, the coincidence circuit 40 of FIG.
The output of the minute counter 33 and the output of the 10th digit of the minute counter 33 are supplied.

Although permanent magnets and reed switches are used in the above embodiments, the present invention is not limited to these, and electrodes, contact pieces, light emitting elements, light receiving elements, etc. may also be used.

Further, the present invention is not limited to detecting the indicated position of the hand of a watch as in the above embodiment, but may be used to convert the indicated value by the hand of various analog display measuring devices into digital.

As described in detail above, according to the present invention, detection elements are provided at every other detection location of a moving body, and the intermediate position of each detection element can also be detected by the actuating element interlocked with the moving body. It requires fewer elements and is effective in downsizing.

In particular, if the indicated position of the hands of a watch is detected, the displayed time can be detected with a simple configuration.

In addition, the displayed time can be easily retrieved as a digital output, and by driving the hands until this and the contents of the clock counter match, the accurate time can be displayed at all times, and the contents of the clock counter can be adjusted when starting or making adjustments. This allows the displayed time to be automatically adjusted.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is a sectional view taken along the line I-1 in Fig. 1, and Fig. 4 is a sectional view taken along the line I-1 in Fig. 1. FIG. 5 is a block diagram showing an electric circuit, FIG. 5 is an electric circuit diagram showing a part of FIG. 4 in detail, and FIG. 6 is a sectional view showing another operation mode of FIG. 2. 24.25...Moving object, 28,29...
- Operating element, 30-30. 31-31...detection element.

Claims (1)

[Claims] 1. A detection element is arranged at every other moving position of a moving body that moves at predetermined intervals, and when the moving body moves in conjunction with the above-mentioned moving body and faces the detection element, only that detection element is activated, and two adjacent An actuating element is provided that operates both of the two detecting elements when located between the output elements,
A first gate circuit that produces an output when two adjacent detection elements are activated is provided, a second gate circuit that produces an output when only one detection element is activated, and the first gate circuit and the first gate circuit are provided. A detecting device for a moving body, characterized in that a detection output of the moving body is obtained at each of the predetermined intervals based on the output of the second gate circuit.