JPH0634045B2 - Electronic clock with water depth gauge - Google Patents

Description

The present invention relates to an electronic timepiece with a water depth gauge.

[Conventional technology]

An electronic timepiece equipped with a water depth gauge, which is equipped with a pressure sensor in an electronic wristwatch in accordance with recent progress in sensor technology, and which switches and displays the pressure value in water of the pressure sensor on the time display section of the electronic timepiece is proposed. Has been done. However, the conventional electronic timepiece with a water depth meter is configured so that the function selecting circuit can be operated to freely select the function by operating the function selecting switch even during diving.

[Problems to be solved by the invention]

When diving using the conventional electronic timepiece with a water depth meter described above, the water depth display should always be displayed after the dive function is called after the dive function has been started. It can cause problems and life-threatening problems.

Therefore, during diving, in order not to shift to a function other than the diving function, it is necessary to pay close attention not to operate the function selection switch by mistake, which is a considerable mental burden on the user.

An object of the present invention is to provide an electronic timepiece with a water depth gauge that prohibits the operation of the function selection circuit by the function selection switch when the water depth exceeds a certain level during diving, and always displays the water depth so that safe diving can be performed. To do.

[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 function selection circuit provided with means for prohibiting the function selection by the function selection switch according to the control signal is provided.

〔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 divider circuit which receives an oscillation signal from the oscillator (1) and outputs a 1 Hz signal.

A clock circuit 3 receives the 1 Hz signal from the frequency dividing circuit 2 as an input, performs a time counting operation, and outputs time information Px. Reference numeral 4 denotes a water pressure sensor made of a diaphragm type semiconductor, which outputs an electric sensor signal in response to a change in water pressure. 5
Is a water pressure measurement circuit, which is composed of an amplification circuit and an A-D conversion circuit, receives the sensor signal as an input, and operates when the input signal Si of the control terminal C is at "H" level,
The water depth information Ps is output. 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 to "L". "Output as level. Reference numeral 7 is a function selection circuit, which is composed of an AND gate 7a and a counter 7b. The AND gate 7a is turned on when one input signal CC is at "H" level, and operates in conjunction with an external operating member. The counter 7b is inverted by allowing the signal of the function selection switch KS to pass, and the time designation signal TK and the depth gauge designation signal DV are alternately output as "H" level as the respective function selection signals. Reference numeral 8 denotes a start / stop circuit (hereinafter referred to as SAP), which is composed of an AND gate 8a and a counter 8b. The AND gate 8a is turned on when one input signal CC is at "H" level, and is an external operating member. The counter 8b is inverted by permitting passage of the signal of the switch SS for starting / stopping the water pressure measurement which operates in tandem with, and outputs "H" level and "L" level alternately as the start signal ST. An AND gate 9 receives a start signal ST and a function selection signal DV and outputs a control signal Si. A display switching device 10 receives time information Px depth information Ps as input, and selectively outputs one of them as display information Pk according to the time designation signal TK or the depth gauge designation signal DV. 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 a normal timepiece function state, the time selection signal TK of the function selection signal output from the function selection circuit 7 is at "H" level, and the display switching device 10 displays the time from the timekeeping circuit 3. The information Px is output as the display information Pk, and the time is displayed on the display device 12 via the decoder driver 11. Further, since the depth gauge designation signal DV is at the "L" level, the depth gauge designation signal DV is input A
The ND gate 9 is turned off and the control signal Si is "L".
Output level.

Therefore, the water pressure measuring circuit 5 which inputs the control signal Si to the control terminal C outputs "0" as the non-operating state Ps. As a result, the water pressure detection circuit 6 receiving the water depth information Ps outputs the control signal CC as "H" level, and AND
The gates 7a and 8a are in the ON state.

Next, the operation of the water depth gauge will be described. When the switch KS is operated once in the timepiece function state, since the AND gate 7a of the function selection circuit 7 is in the ON state, the counter 7b operates and the depth gauge designating signal DV becomes "H" level. As a result, the 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 S
The start signal ST output from AP8 becomes "H" level. Therefore, the output signal Si of the AND gate 9 is "H".
When the level is reached, the water pressure measuring circuit 5 is activated and outputs the water depth information Ps. However, when the diving is not performed yet, the water depth information Ps is Ps <1 m, so the control signal from the water pressure detection circuit 6 is given. Since the AND gates 7a and 8a continue to be in the ON state while CC remains at the "H" level, both operation signals by operating 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 to restore the timepiece function. From this state, the wearer
When the dive is started, the water depth is detected by the water pressure sensor 4, so that the display device 12 displays the water depth. After the dive is started, the water depth information Ps is Ps ≧ 1.
At the meter, the water pressure detection circuit 6 sends the control signal CC
The AND gates 7a and 8a are set to O in order to attain the L "level.
The FF state is set, and a state where the operation signal is not allowed to pass by the operation of the switches KS and SS. In this state, the switch KS does not return to the timepiece function, so that the water depth information is always displayed. Then, when the wearer finishes diving and ascends, the water depth information Ps decreases, and when the water depth information Ps becomes Ps <1 m, the control signal CC becomes “H”.
The AND gates 7a and 8a are turned on, the operation signals by the operation of the switches KS and SS can be passed, and the switching operation to the timepiece function state is possible.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the function selection by the function selection switch is configured to be prohibited when the water pressure detects a water depth above a certain level. Is selected and the water depth information is always displayed without displaying the time information, which has a great effect on the commercialization of an electronic timepiece with 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 ... Clock 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 pressure sensor, a water pressure measurement circuit for converting an output signal from the water pressure sensor into a water pressure measurement value, and measurement value information and time information of the water pressure measurement circuit are input, and one of them is selected and output. In an electronic timepiece having a display switching device, a function selecting circuit for controlling the display switching device and displaying output information on the display device, and an electronic timepiece having a function selecting switch, the measured value of the water pressure measuring circuit is equal to or more than a predetermined value. When a water pressure detection circuit detects a water depth above a certain level by providing a water pressure detection circuit for detecting a water pressure and outputting a control signal and controlling the function selection circuit by the control signal. An electronic timepiece with a water depth gauge characterized by prohibiting function selection with a selection switch.