JPS62222183A - Hand display type electronic time-piece - Google Patents

Abstract

PURPOSE:To make it possible to detect the position of a hand, by providing a transparent electrode divided into a plurality of sections in the circumferential direction on a dial and detecting the capacity generated between the electrode and the hand. CONSTITUTION:A min hand position detecting transparent electrode 4 and an hr hand position detecting transparent electrode 5 are provided on a dial 3. When a min hand 1 reaches the electrode 4, capacity increases between the min hand 1 and the electrode 4. The capacity generated in this state is converted to a time in a capacity measuring means 8 by utilizing that the phase of a pulse wave form is further delayed by a time constant and said time is changed to a pulse to be counted by a counter. Subsequently, the counted value is input ted to a hand position judge means 9 which in turn judges that the min hand 1 is present on the electrode 4 to write the max. value among values sent from the means 8 in a hand position memory means 10. By this method, the position of each hand can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pointer display type timepiece, and more particularly to a pointer position detection method.

[Summary of the invention]

In an electronic watch with a pointer display, a transparent electrode is divided into multiple parts in the circumferential direction on the dial. ? By detecting the pointer position, it is possible to detect the position of the pointer.

[Conventional technology]

Conventionally, the method of the pointer position detection device of a pointer display type watch has a first electrode on a part of the gear that fully drives the pointer, and a second electrode that is in constant contact with the gear, so that the gear rotates. Therefore, the position of the pointer was written in the circuit by the wheel where the electrodes touched each other.

[Problems to be solved by the present invention]

However, in the conventional pointer position detection device,
Because the second electrode and @east are in constant contact, the device was required to be highly durable. Also, the load on the motor increases, so should I use all the high-performance motors or increase the voltage applied to the circuit to rotate the motor? I needed to raise it.

[Means to resolve the problem]

In order to solve the above-mentioned problems, the present invention provides a pointer display type Shigeko clock, which is an electronic watch in which the time is indicated entirely by the pointer, and includes a transparent electrode divided into a plurality of parts in the circumferential direction on the dial plate, the transparent electrode, the pole and the pointer. Capacitance measuring means converts into time and measures by utilizing the phase delay of the pulse waveform due to the capacitance jk'Jjr time constant CR that occurs during The largest one?A pointer detection means for detecting which electrode the selected pointer is on, and a pointer position storage means for storing the pointer position detected by the pointer detection means. shall be.

[Effect]

To describe the function of the present invention, the pointer moves and is installed on the dial. : When the pointer comes above the transparent electrode, the pointer and transparent 1u
A capacitance is generated between ii and Q, and a time constant CR is applied to the capacitance that occurs.
This delay in the phase of the pulse waveform is converted into time and measured by a capacitance measuring means. The capacitance measuring means selects the largest value among the measured pull values to determine the position of the pointer.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a plan view of a T dial plate using an embodiment of the present invention, and FIG. 2 is a block diagram of the present invention. 1 is the minute hand of the time display hands, and 2 is the hour hand of the time display hands. On the dial 5, there are transparent electrodes 9c for detecting the position of the 4th minute hand, and transparent electrodes for detecting the position of the 5th hour hand. 1 minute hand and 4 transparent! Capacity increases between the poles.

The generated capacitance is determined by the time constant CR in the capacitance measuring means 8.
The phase of the pulse waveform is delayed by a margin, which is converted into time, and this time is converted into a pulse, counted by a counter, and the value is input to the needle position determination circuit in 90. The maximum value sent from the capacitance measuring means is judged to be the transparent electrode with the minute hand on top.
Write to the needle position memory circuit.

FIG. 3 shows the circuit configuration of the capacitance measuring means of the present invention. Detection of the position of the minute hand is performed as follows.

The capacitance value is converted into time by utilizing the fact that the phase of the pulse waveform is delayed by the time constant CH. This time is converted into pulses and counted by a counter. In the figure, VDD is in contact with the pointer at a positive potential of the power supply, and is at a negative potential with respect to VssHVDD.

Transparent 11% 4 that 11 CPUs want to sense? If specified, decoder-12? Through this, the analog switch 13 connected to the transparent electrode 4 is turned on.

In synchronization with the designation of the transparent electrode, the input A of 14 becomes the Vss level, the PMOS transistor 15 turns on, and the capacitance component C is accumulated.1. The charge that was being discharged is released. Next is A? When set to VDD level, nMO8) transistor 16 turns on and capacitance component C[, 17 resistor R? -t/CRVB = (VDD -Vss)
As l -t/CR and time t increase, 1. The power decreases exponentially.

VB and 17 threshold Vreffr are input to comparator 18.

The output B'ld of this comparator 18 rises with a delay of time td relative to the human power A.

td--CRA! n(Vref/(VDD-Vsa)
1.This pulse TI? Count at frequency fc. As a result, a value proportional to the capacitance was obtained, and as a result of measuring the capacitance t generated in each transparent electrode, the transparent electrode that showed the maximum capacitance! It is determined that the minute hand exists at the top.

The same goes for the hour hand, but the detection method is when the hour hand is located between two transparent electrodes and the two electrodes are separated by 1+f.
Scale number 1. There was one big error. So, if the second digit value indicated by the minute hand is OmfI:, V'11, then
Select the larger value on both sides of the border indicated by the hour hand, and if the second digit value of the minute hand is 41iH5, select the smaller value on both sides of the border indicated by the hour hand.

Furthermore, when the minute hand 1 passes over the transparent electrode 4 for detecting the position of the minute hand, it always passes over the transparent electrode 5 for detecting the position of the hour hand.

As a result, two positions of the hour hand can be detected,
In this case, the correct position of the hour hand is the 10,000 position farthest from the minute hand.

The above invention eliminates the need for special gears and electrodes, and since there is no contact between the pointer and the electrodes, the requirement for strong durability of the device is also eliminated. The load on the 1t motor is no different from that of a normal 11 pointer display type watch, and the position of the pointer can be detected accurately. ti, the pointer position storage means B can also be used to set an alarm time.

〔Effect of the invention〕

As described above, according to the present invention, in order to detect the position of the pointer by detecting the capacitance generated between the transparent electrode and the pointer, which is divided into a plurality of parts on the dial, There is no need for any contact between the pointer and electrodes, so there is no need for strong durability of the device, and no special structure is required other than attaching a transparent electrode on the dial, so it is common to have a pointer position detection function. A complicated structure with the same durability as a pointer display type electronic watch? Due to the fact that it does not hold, it is no different from a general pointer display type electronic watch in terms of price.

In particular, since it is possible to compare the capacitance between electrodes using the rate of taking the genus as in the example, it is easy to determine when the pointer is between the electrodes, and the 12-hour hand position can be detected in minute increments. The back is possible.

A pointer display type watch with such a WIl configuration can perform many functions that were considered impossible in a conventional pointer display type watch. By having a pointer position storage means,
Accurate alarm time setting is possible, and even if the pointer position is completely changed, the previous position is memorized, so it is possible to return after a certain period of time.

It is also possible to switch between a stopwatch or timer and normal time using the same hand.

By using transparent transparent Ichiyu'ff, it has almost no effect on the design, which is important for watches.

[Brief explanation of drawings]

Figure 1 shows a plan view of a T dial using an embodiment of the present invention, and Figure 2 is a block diagram of the present invention. show. Further, FIG. 3 shows a circuit configuration diagram of the capacitance measuring means of the present invention. 1, minute hand 2, hour hand 5, dial 4, transparent electrode for detecting minute hand position 5, transparent electrode for detecting hour hand position 6, clock circuit 7, pointer drive circuit 8, capacitance measuring means 9, pointer position determining means 10, pointer position Storage means 11, CPU 12, decoder 15, analog switch 14, input A 15, pMOS transistor 16, nMOS transistor 17, resistor 18, comparator Applicant Seiko Epson Corporation Figure 1 Figure 2

Claims (2)

[Claims] (1) In electronic watches that display the time using hands, a transparent electrode is divided into multiple parts in the circumferential direction on the dial, and the phase of the pulse waveform is controlled by the time constant CR, which is the capacitance generated between the transparent electrode and the hands. capacitance measuring means that takes advantage of the delay and converts it into time for measurement; pointer position detecting means that selects the largest one from among those measured by the capacitance measuring means and detects which electrode the pointer is on; A pointer display type electronic timepiece characterized by comprising pointer position storage means for storing the pointer position detected by the pointer position detection means. (2) The pointer display type electronic timepiece according to claim 1, wherein the transparent electrode divided into a plurality of parts is divided into one for detecting the position of the minute hand and the other for detecting the position of the hour hand.