JPH0668444B2 - Depth gauge - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water depth gauge.

[Prior Art] With the recent advancement of sensor technology, a water depth gauge equipped with a pressure sensor, and a method of displaying the pressure value in water of the pressure sensor on the display of the water depth gauge is proposed. Has been done. However, the conventional water depth meter is configured so that the user can freely select the water depth measurement state or the water depth non-measurement state by operating the water pressure measurement control switch even during diving.

[Problems to be solved by the invention]

When diving using the above-mentioned conventional depth gauge, the water depth is always displayed in the water depth measuring state, and if the diving is not performed while confirming the current water depth, an error may occur and a life-threatening problem may occur.

Therefore, during diving, it is necessary to pay close attention not to accidentally operate the water depth measurement control switch in order not to shift from the water depth measurement state to the non-measurement state, which is a considerable mental burden to the user. .

The object of the present invention is to prevent the control of the water depth measurement circuit by the water depth measurement control switch when the water depth becomes a certain level or more during diving, always keep the water depth measurement state, display the water depth, and make it possible to safely dive. Provide a total.

[Means for solving problems]

In order to achieve the above object, the present invention has the following configuration. A water pressure measurement circuit that converts the output signal from the water pressure sensor into a water pressure measurement value, and a water pressure detection circuit that detects when the measurement value of the water pressure measurement circuit exceeds a predetermined value and outputs a control signal of the function selection circuit. It is characterized in that a water depth measurement control circuit is provided, which has means for prohibiting control of the water pressure measurement circuit by the water depth measurement control switch according to the control signal.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of an electronic timepiece according to the present invention.

Reference numeral 1 is an oscillator whose time base is a crystal oscillator, and 2 is a frequency dividing circuit which receives an oscillation signal from the oscillator 1 and outputs a 1 Hz signal. Reference numeral 3 denotes a time counting circuit, which receives the 1 Hz signal from the frequency dividing circuit 2 as input and performs time counting operation to output time information Px.

4 is a water pressure sensor made of a diaphragm type semiconductor,
An electrical sensor signal is output according to the fluctuation of water pressure. 5
Is a water pressure measuring circuit, which is composed of an amplifying circuit and an AD converting circuit, receives the sensor signal as an input, and the input signal Si of the control terminal C is It operates at the level and outputs water depth information Ps. A water pressure detection circuit 6 receives the water depth information Ps as an input, detects that the water depth information Ps is a predetermined value or more (for example, Ps ≧ 1 meter), and outputs a control signal CC of a function selection circuit 7 described later. Output as a level. 7 is a function selection circuit, AND
It consists of a gate 7a and a counter 7b.
a is one input signal CC When the level is ON, the counter 7b is inverted by allowing the signal of the function selection switch KS that operates in conjunction with the external operating member to pass, and the time designation signal TK and the water depth meter designation as each function selection signal. Alternating signal DV Output as a level. 8 is a water pressure measurement control circuit,
It is composed of an AND gate 8a and a counter 8b, and the AND gate 8a receives one input signal CC. When the level is ON, the counter 8b is inverted by allowing the passage of the signal of the switch SS for water pressure measurement control that operates in conjunction with the external operating member, and the counter 8b is inverted
As ST level, Output levels alternately. An AND gate 9 receives the start signal ST and the function selection signal DV and receives the control signal Si.
Is output. Reference numeral 10 is a display switching device, which inputs the time information Px and the water depth information Ps, and inputs the time designation signal TK or the depth gauge designation DV.
Either one of them is selected and output as the display information Pk according to. Then, the display information Pk selected by the display switching device 10 is displayed on the display device 12 via the decoder driver 11.

Next, the operation of the electronic timepiece having the above configuration will be described.

In the normal clock function state, the function selection signal output from the function selection circuit 7 is the time designation signal TK. The display switching device 10 outputs the time information Px from the clock circuit 3 as the display information Pk, and the time is displayed on the display device 12 via the decoder driver 11. In addition, the water depth gauge designation signal DV is Since it is at the level, the AND gate 9 that is inputting the water depth meter designation signal DV is in the OFF state and the control signal Si Output level. Therefore, control signal Si is applied to control terminal C
The water pressure measuring circuit 5 being input to is in the water pressure non-measurement state, and as the water depth information Ps. Is output. As a result, the water pressure detection circuit 6 receiving the water depth information Ps outputs the control signal CC. It outputs as a level, and AND gates 7a and 8a are turned on.

Next, the operation of the water depth gauge will be described. When the switch KS is operated once in the clock function state, the function selection circuit 7 operates the counter 7b because the AND gate 7a is in the ON state, and the water depth gauge designation signal DV is output. Become a level. The result display switching circuit 10 switches and outputs the water depth information Ps from the water pressure measuring circuit 5 as the display information Pk, and the water depth information is displayed on the display device 12 via the decoder / driver 11 to serve as a water depth gauge function. When the switch SS is operated in this state, the water pressure measurement control circuit 8
The start signal ST output from It becomes a level. Therefore, the output signal Si of the AND gate 9 is When the level is reached, the water pressure measuring circuit 5 outputs the water depth information Ps in the water pressure measuring state, but when the diving is not yet performed, the water pressure detecting circuit 6 controls the water depth information Ps since Ps <1 meter. Signal CC Since the AND gates 7a and 8a are in the ON state while maintaining the level state, both the operation signals by the operations of the switches KS and SS are in a state of being accepted. Therefore, in this state, when the wearer operates the switch KS again, the function selection circuit 7 operates and returns to the timepiece function.

When the wearer starts diving from this state, the depth of the water is detected by the water pressure sensor 4, so that the display device
The water depth is displayed at 12. After the start of diving, when the water depth information Ps becomes Ps ≧ 1 meter, the water pressure detection circuit 6 outputs the control signal CC. AND gates 7a and 8a are turned off to set the level
The operation signal is prevented from passing through by operating the switches KS and SS. In this state, the switch KS does not return to the clock function, so the water depth information is always displayed.

When the wearer finishes diving and comes up, the water depth information Ps decreases, and when the water depth information Ps becomes Ps <1 meter, the control signal CC is changed. Then, the AND gates 7a and 8a are turned on, and the operation signals by operating the switches KS and SS can be passed, and the switching operation of the water pressure measurement circuit 5 to the water pressure non-measurement state becomes possible.

〔The invention's effect〕

As is clear from the above description, according to the present invention, the control of the water pressure measurement circuit by the water pressure measurement control switch is configured to be prohibited when the water pressure detects a water depth equal to or higher than a certain level. It is possible to avoid the fact that the water pressure measurement circuit is in a non-measurement state and the water depth display is not displayed due to a malfunction, and since the water depth information is always displayed, it has a great effect on the commercialization of a water depth gauge that enables safe diving. .

[Brief description of drawings]

 FIG. 1 is a circuit block diagram of the electronic timepiece of the invention. 3 ... Timer circuit, 4 ... Water pressure sensor, 5 ... Water pressure measurement circuit, 6 ... Water pressure detection circuit, 7 ... Function selection circuit, 10 ... Display switching device.

Claims (1)

[Claims] 1. A water depth gauge equipped with a water pressure sensor, a water pressure measurement circuit for converting an output signal from the water pressure sensor into a water pressure measurement value, a water pressure measurement control circuit for controlling the operation of the water pressure measurement circuit, and a water pressure measurement control switch. In this, by providing a water pressure detection circuit that outputs a control signal by detecting that the measured value of the water pressure measurement circuit has become a predetermined value or more, by configuring the water pressure measurement control circuit by the control signal A water depth gauge, wherein the control of the water pressure measurement control circuit by the water pressure measurement control switch is prohibited when the water pressure detection circuit detects a water depth above a certain level.