JPS61292519A - Position detecting apparatus - Google Patents

Abstract

PURPOSE:To improve reliability of apparatus with a less number of in- and output terminals and reduced size of circuit, by using in common the in- and output terminals led out of circuits. CONSTITUTION:When a pulse is generated from a terminal PHI1 of pulse supplying circuit PG, it is supplied to a terminal IO, through an inverter T1. And, this pulse is supplied to gate circuits G1-G3 and at the same time introduced to a terminal 102 through diode D1 and contact piece A. By this arrangement, the terminal 102 shows 1 and output of an inverter T4 shows 0 and output of the circuit G1 shows 1. On the other hand, outputs of the gates G2-G4 are all 0 and at this moment, BCD code output representing one o'clock is generated from an encoder E. And, this code output is latched in a latch circuit L by the specified pulse. Further, by output of the switch closing at the right time, time signals in frequencies corresponding to the content of the latch circuit L are given.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a position detection device for a movable body.

[Prior Art] For example, regarding a time signal clock that reports the time by detecting the position of the hour hand, Japanese Patent Application Laid-Open No. 60-66180, which the present applicant previously filed,
There is one with the number. This method involves sliding the contact piece relatively over two rows of electrodes in conjunction with the rotation of the hour hand, and the out-of-phase pulses supplied to the electrodes in one row are transmitted from which electrode in the other row. The system detects the position of the hour hand and signals the time depending on whether the alarm occurs.

[Problems to be Solved by the Invention] The above device has a pulse output terminal and an input terminal, so there are at least 7 terminals derived from the circuit.
This book was just what I needed. As a result, the chip size of the IC increases, wire bonding costs increase, the yield is low, and the reliability of mounting is low.

The present invention solves the above drawbacks by reducing the number of input/output terminals.

[Means for Solving the Problems] The present invention involves sliding a contact piece over two rows of electrodes, supplying pulses with different phases to a plurality of input/output terminals connected to each electrode, and The positional relationship between the contact piece and the electrode is detected by receiving a pulse and a pulse input by the pulse through an electrode, a contact piece, and an element having current directionality.

[Example] In FIG. 1, a plurality of electrodes ES1 to ES4 and EC1 to EC4 are formed in two concentric rows on a disk. Electrodes ES1 to ES4 are input/output terminals IO1 to I, respectively.
04, and electrodes EC1-EC4 are connected to terminals IO1-IO4 via diodes D1-D4, respectively. A is a contact piece that rotates in conjunction with the hour hand (not shown) and is fixed to the hour hand shaft B, which is a moving device. Contact piece A
The contact a1 moves one time on the outer electrode, and the contact a2 slides on the inner electrode. The electrodes are arranged so that the inner electrode in contact with contact a2 of contact piece A and the outer electrode in contact with contact a1 are not connected to a common input/output terminal. . For example, when the contact a2 is in contact with the electrode EC1 as shown, the contact a1 is in contact with any one of the electrodes ES2 to ES4 and never with the electrode ES1. As a result, the inner four types of electrodes and the outer three types of electrodes connected to these 12
By combining the types, a matrix circuit as shown in FIG. 2 is constructed, and it is possible to detect 1 o'clock to 12 o'clock. Each electrode is formed to extend beyond the hour position so that this detection can be performed well before the hour.

FIG. 3 shows a circuit for performing this detection.

In the figure, PG is a pulse supply circuit, and pulses having different phases are sequentially generated from the output terminals 1 to Φ4, respectively, as shown in FIG. T1 to T8 are inverters, G1
-G12 is a gate circuit, E is an encoder, and L is a latch circuit.

Next, the operation will be explained. When contact piece A in FIG. 1 is in the state shown, when a pulse is generated from terminal Φ1 of pulse supply circuit PG, it is supplied to terminal I01 via inverter T1. This pulse is gate circuit 01~G
The signal is supplied to the terminal IO2 through the diode D1 and the contact piece A. Therefore, the terminal IO
2 becomes "1", the output of inverter T4 becomes "OII", and the output of gate circuit G1 becomes "1".

The outputs of the gate circuits 02 to G12 are all "O", and at this time, the encoder E generates a BCD code output representing 1 o'clock. This code output is latched by the latch circuit by the pulse RD in FIG.

Then, based on the output of a switch (not shown) that closes on the hour, the time is reported a number of times corresponding to the contents of the latch circuit.

When the contact piece A rotates from the illustrated state and the electrodes EC1 and ES3 become conductive, the pulse from the terminal Φ1 is supplied to the terminal IO3, and the output of the gate circuit G2 in FIG. 3 becomes 441 It. At this time, encoder E generates a 2 o'clock code output.

Thereafter, in the same manner, as the contact piece A rotates, the outputs of the gate circuits G3 to G12 sequentially become "1", and the encoder E
The code output from 3 to 12 o'clock is generated.

By the way, as for the output inverters T1, T3, T5, and T7, those having a configuration as shown in FIG. 5, for example, are used. That is, a resistor R is connected between the N-channel transistor n and the output terminal. This is due to the following reasons. For example, in the state shown in Figure 3, when a pulse is generated from terminal 1, inverter T3
The output of is "O", that is, the N-channel transistor n in FIG. 4 is on. Without this bridging resistor R, the pulse of 111 It from terminal I01 would be
2, the terminal 102 remains held at "'O" and does not invert to "1". Therefore, by inserting a resistor R, the terminal IO2 is made to have priority over "1" over "O".

This allows input pulses to be captured.

The same applies to the other inverters T3, T5, and T7.

In the above embodiment, a diode is provided for each of the terminals IO to IO4, but instead of this, a diode D5 may be connected in series to the contact piece A as shown in FIG. According to this, only one diode is required.

Next, an example of use in a 24-hour clock will be explained. In Figure 7, the disk has six types of electrodes EI.
~EI6 and EC1 to EC6 are formed in two rows. Input/output terminals IO5 to 101o are derived from each electrode. These electrodes and contact piece A constitute a matrix circuit as shown in FIG.

Note that the detection circuit is configured similarly to that shown in FIG. 3, so its description will be omitted.

By supplying pulses having different phases as shown in FIG. 9 to the terminals IO5 to IO1°, 1 to 24 o'clock is detected in the same manner as in the above example.

In the above embodiment, the electrode was fixed and the contact piece was rotated, but the contact piece may be fixed and the electrode rotated.

Further, the present invention is not limited to detecting the display position of the hour hand, but can be applied to detecting the position of various movable bodies. For example, multiple electrodes are arranged in two lines in a straight line, and a contact piece is slid on each row of electrodes in conjunction with a slide knob to detect the position of the slide knob and adjust the volume of the audio equipment. You can do it like this.

[Effects of the Invention] According to the present invention, since the input/output terminals are also used, the number of terminals can be reduced, and the chip size of the circuit can be small.
Wire bonding costs are reduced and mounting reliability is improved.

[Brief explanation of drawings]

Figure 1 is a front view showing an example of the electrode configuration of the present invention, Figure 2 is a front view showing an example of the electrode configuration of the present invention;
The figure is a circuit diagram showing a matrix circuit constituted by the electrodes and diodes in Figure 1, Figure 3 is a logic circuit diagram showing an example of a circuit configuration for detection, and Figure 4 is a diagram for explaining the operation. 5 is an electric circuit diagram showing in detail a part of the configuration of FIG. 3, FIGS. 6 and 7 are front views showing other examples of electrode configurations, and FIG. FIG. 7 is a circuit diagram showing a matrix circuit constituted by the electrodes, and FIG. 9 is a time chart 1 to explain the operation. EC1-EC4... Electrode EC1-EC4... Electrode A... Contact piece B... Hour hand axis D1-D6... Diode I01-■04... Input/output terminal PG... Pulse supply Circuits G1 to G12...Gate circuit E...Encoder EC1 to EC4...Electrodes EC1 to EC6...Electrodes IO5 to l01o...Pre-input/output terminals or higher

Claims (1)

[Claims] A plurality of electrodes in two rows formed on a substrate, a contact piece that comes into elastic contact with the electrodes in each row and makes conduction between the elastically contacted electrodes, and one of the contact pieces and the above-mentioned substrate is moved to connect the above-mentioned contact piece. A moving device that relatively slides on each row of electrodes, a plurality of input/output terminals connected to each of the electrodes, and a pulse that sequentially supplies pulses with different phases to each input/output terminal. Consisting of a supply circuit, and an output circuit that receives a pulse output from the pulse supply circuit and a pulse inputted by the pulse through the electrode, the contact piece, and an element having current directionality, and generates an output. Position detection device.