JPS5918513Y2 - electronic desk calculator - Google Patents

Description

[Detailed description of the invention] This invention relates to an electronic desktop calculator that has multiple functions such as a calculation function and a time display function. This is the purpose.

Conventional electronic desktop calculators with clocks require a lock switch for changing the time adjustment mode to prevent the time from getting incorrect when carried or by accidentally pressing the time adjustment key on a regular calculator.

The present invention focuses on this point, and by pressing a plurality of predetermined keys in a predetermined order, the input of, for example, a time adjustment key is enabled, thereby eliminating the need for the lock switch.

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

In FIG. 1, 1 is a display section that displays numbers, calculation results, and time, and 2 is a numeric key such as 0 to 9 and 9 sections.

Calculation key, which is to be avoided from function keys such as Japan, 9 countries, etc., 3 is a time adjustment key to adjust the hours, minutes, and seconds of the clock, 4 is a clear function that doubles as a clear during calculations and a changeover switch to switch from the clock display to calculation mode. The key 5 is a switching key for switching from calculation mode to clock display, and 6 is a housing.

Figure 2 shows the electrical configuration of the computer.
3. 4 correspond to the same reference numerals in FIG.

7 is an integrated circuit provided with a calculation circuit and a clock circuit; 8
9 is a keyboard, 9 is an order detection circuit that detects that the function keys are pressed in a predetermined order, for example, 田→日→ 類→田. 10 is set by obtaining the output of circuit 9, and a clear key 4 is set. A flip-flop for switching the time adjustment mode set by the output of
11 is a gate circuit.

Now, when adjusting the time, if you manually press the function keys in the order of 田→日→图→国, the order detection circuit 9 detects this and flips the flip-flop.

Set 10.

Therefore, the gate 11 is turned on, and the manual input of the time adjustment key 3 becomes effective.

After adjusting the time, the flip-flop 10 is reset by operating the clear key 4, and the gate 11 is turned off.
becomes.

Therefore, the manual input of the time adjustment key 3 is effective, and even if it is pressed by mistake, the time will not go out of order.

Although the above description is about time adjustment mode switching, this does not limit the present invention, and it goes without saying that it can be applied to various mode switching of an electronic desktop calculator with a multi-function clock, such as a stopwatch and a counter.

As is clear from the above explanation, according to the present invention, the calculation mode can be switched to the time adjustment mode by operating multiple function keys in a predetermined order, so there is no operational error as in combinations involving numerical keys, and therefore the mode It is practical because there is no need to provide a lock switch or the like for switching.

[Brief explanation of the drawing]

FIG. 1 is a front view of an electronic desktop calculator according to an embodiment of the present invention, and FIG. 2 is a block diagram showing its electrical configuration.

Claims (1)

[Scope of utility model registration request] A calculation key and a time adjustment key, which are more powerful than numerical keys and function keys, are provided on the keyboard, a detection circuit detects that the plurality of function keys are operated in a predetermined order, and control is performed by the output of the detection circuit. An electronic % formula configured to switch from calculation mode to time adjustment mode in which operation of the time adjustment key is enabled through means.