JPH0516526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a position detection device for a movable body.

[Prior Art] For example, in the case of a time clock that reports the time by detecting the position of the hour hand, there is
-There is one numbered 66180. 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 depending on whether the alarm occurs or not, and reports the time.

[Problems to be Solved by the Invention] The above device requires at least seven terminals led out from the circuit because it has a pulse output terminal and an input terminal. As a result, the chip size of the IC has increased, wire bonding costs have increased, the yield has been low, and the reliability of mounting has been 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 ES ₁ to ES ₄ and EC ₁ to EC ₄ are formed in two concentric rows on a disk D. Electrodes ES ₁ to _{ES 4} are each input/output terminal IO ₁
~ _IO4 , and the electrodes _EC1 ~ _EC4 are connected to the 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 point _a1 of contact piece A slides on the outer electrode,
Contact a ₂ slides on the inner electrode. Contact point of contact piece A
The electrodes are arranged so that the inner electrode in contact with a ₂ and the outer electrode in contact with contact a ₁ are not connected to a common input/output terminal. For example, as shown, contact a ₂ is the electrode
When in contact with EC ₁ , contact a ₁ is connected to electrode ES ₂ ~
It is in contact with either electrode ES ₄ and never with electrode ES ₁ . This allows the inner four types of electrodes to be connected to the outer three types of electrodes.
A matrix circuit as shown in Fig. 2 is constructed by 12 types of combinations, and can 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 same figure, PG is a pulse supply circuit,
Pulses with different phases are sequentially generated from the output terminals Φ ₁ to Φ ₄ , respectively, as shown in FIG. T1
~T8 is an inverter, _G1 ~ _G12 is a gate circuit, E
is an encoder, and L is a latch circuit.

Next, the operation will be explained. Contact piece A in Fig. 1
When is in the state shown, a pulse is generated from the terminal Φ ₁ of the pulse supply circuit PG, which is supplied to the terminal IO ₁ via the inverter T1. This pulse is supplied to the gate circuits G ₁ to _{G 3} and is input to the terminal IO ₂ via the diode D ₁ and the contact piece A. Therefore, terminal IO ₂ becomes “1”,
The output of the inverter _T4 becomes "0" and the output of the gate circuit _G1 becomes "1". Other gate circuits
The outputs of _G2 to _G12 are all "0", and at this time, encoder E generates a BCD code output representing 1 o'clock. This code output is latched into the latch circuit L by the pulse RD in FIG.

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

Contact piece A rotates from the state shown, and electrode EC ₁ and
When ES ₃ conducts, the pulse from terminal Φ ₁
It is supplied to IO ₃ , and the output of gate circuit G ₂ in FIG. 3 becomes "1". At this time, encoder E generates a 2 o'clock code output.

Thereafter, in the same way, as the contact piece A rotates, the outputs of the gate circuits _G3 to _G12 become "1" sequentially, and the encoder E generates code outputs from 3 o'clock to 12 o'clock.

By the way, the output inverters T ₁ , T ₃ , T ₅ , T ₇
For example, a configuration as shown in FIG. 5 is used. That is, a resistor R is connected between an N-channel transistor n and an 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 Φ ₁ , the output of inverter T ₃ is "0".
In other words, the N-channel transistor n in FIG. 4 is turned on. At this time, if there is no resistor R, even if the "1" pulse from the terminal IO ₁ is supplied to the terminal IO ₂ , the terminal IO ₂ will remain at "0" and will not be inverted to "1". Therefore, by inserting a resistor R, the terminal IO ₂ is made to have priority over "1" over "0". This allows input pulses to be captured.

The same applies to the other inverters T ₃ , T ₅ , and T ₇ .

In the above embodiment, a diode was provided for each of the terminals IO ₁ to IO ₄ , but instead of this, a diode D ₅ was provided in series with the contact piece A as shown in FIG.
You may also connect it. According to this, only one diode is required.

Next, an example of use in a 24-hour clock will be explained. In FIG. 7, six types of electrodes EI ₁ to EI ₆ and EO ₁ to EO ₆ are formed in two rows on the disk D. From each electrode is an input/output terminal IO ₅ ~
IO ₁₀ has been derived. 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 _IO10 , 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, a plurality of 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 and output terminals are also used,
Fewer terminals are required, the circuit chip size is smaller, wire bonding costs are reduced, and the reliability of the assembly is improved.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of the electrode configuration of the present invention, FIG. 2 is a circuit diagram showing a matrix circuit constituted by the electrodes and diodes shown in FIG. 1,
Fig. 3 is a logic circuit diagram showing an example of the circuit configuration for detection, Fig. 4 is a time chart for explaining the operation, and Fig. 5 is an electrical circuit diagram showing a part of the configuration of Fig. 3 in detail. 6 and 7 are front views showing other examples of electrode configurations, FIG. 8 is a circuit diagram showing a matrix circuit configured by the electrodes in FIG. 7, and FIG. 9 is a circuit diagram. is a time chart to explain the operation. ES ₁ ~ ES ₄ ... Electrode, EC ₁ ~ EC ₄ ... Electrode, A...
...Touch piece, B...Hour hand shaft, _D1 to _D6 ...Diode,
IO ₁ to IO ₄ ... Input/output terminal, PG ... Pulse supply circuit, G ₁ to _{G 12} ... Gate circuit, E ... Encoder, EI ₁ to _{EI 6} ... Electrode, EO ₁ to EO ₆ ... electrode,
IO ₅ to IO ₁₀ ...Input/output terminals.

Claims (1)

[Claims] 1. A plurality of electrodes in two rows formed on a substrate, a contact piece that comes into elastic contact with the electrodes of each row and establishes conduction between the elastically contacted electrodes, and one of the contact pieces and the substrate is moved to form the contact piece. a moving device that relatively slides the above electrodes on each row of electrodes, a plurality of input/output terminals connected to each of the electrodes, and sequentially supplying pulses with different phases to each of the input/output terminals. a pulse supply circuit, and an output circuit that receives a pulse output from the pulse supply circuit and a pulse input by the pulse through the electrode, the contact piece, and an element having current directionality, and generates an output. A position detection device consisting of.