JPS5814264A - Small size calculator - Google Patents

Abstract

PURPOSE:To simply converts the unit of an entried value from the 1st to the 2nd unit, by storing the conversion value among various units to a memory. CONSTITUTION:In addition to a normal power switch 11, entry keys 11, operation keys 13, and function keys 14, a unit indicating key 15 indicating a unit related to the conversion is provided. A display section 16 is provided with a numeral value display section 16a and a unit display section 16b in parallel. A memory storing the conversion values among various units is constituted with an ROM and a non-volatile memory and incorporated. For example, in the conversion from Tsubo (unit of area) into m<2>, the key ''Tsubo'' is depressed for entry and ''m<2>'' is depressed, then the conversion value is displayed on the display section 16. Thus, without preparing the conversion table separately and memory of the conversion rates, the conversion among the units can easily be done.

Description

[Detailed Description of the Invention] The present invention relates to a small calculator such as a card type or a desk type calculator, a so-called electronic desk calculator (calculator) K, and in particular, a novel calculator that facilitates conversion between various units such as weights and measures. This project proposes a small computer.

In daily life, it is often necessary to convert between two units. For example, Tsubo-mM.

Bond-69 inch-n, etc. are examples. To convert between these units, multiply the value to be converted, for example, 57 tsubo, by the unit amount conversion value (for example, 1 tsubo = 3.3 rn"). However, if you do not remember the unit quantity conversion value, it is troublesome to search for the welfare conversion table, and if you rely on your memory, you may be concerned about whether or not the stored conversion value is correct.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a small-sized calculator that can perform unit quantity conversion with simple operations. FIG. 1 is an external view of a computer according to the present invention, and FIG. 2 is a block diagram of its main parts.

In Fig. 1, 11 is a power switch, 12 is a numeric key,
Reference numeral 13 indicates a calculation key, and reference numeral 14 indicates a function key. In addition to these general keys, the machine of the present invention has a unit instruction key 15 for indicating the unit to be involved in conversion.

The display section 16 has a numerical display section 16aJ and a unit display section 16b arranged in series.

In addition to the conversion described below, the device of the present invention is also capable of performing four arithmetic operations like a general calculator.

In FIG. 2, 20 is an arithmetic control unit that is the arithmetic control center of the present invention machine, 17a is a numerical register that stores numerical data etc. to be displayed on the numerical display unit 16a, and 17a is a numerical register that stores numerical data etc. to be displayed on the x'yb company unit display unit 1613. This is a register that stores data related to. 1IFi A memory that stores conversion values between various units, and is composed of ROM, nonvolatile memory, etc.

The unit instruction key 15 has various units of weight and measurement written on the key top. As described later, when converting, press the unit indication key, numeric key, and other unit indication keys in this order.
However, when the arithmetic control unit 20Fi presses the first unit instruction key 15, it is assumed that there is a conversion instruction li! ! 1. The unit written on the key top of this keystroke key is stored in a predetermined internal register as a pre-conversion unit, and furthermore, the data required for displaying this unit is stored in order to be displayed on the unit display section 16b. It is output to the unit register l〒b, stored there, and displayed on the unit display section 161).

The arithmetic control unit 20 then inputs the numerical value input from the numeric key 12 through the numerical register l'Fa, and first inputs the numerical value to the unit instruction key 1.
5, f#I is stored in a predetermined internal register as a numerical value expressed in the unit shown. This numerical data is stored in the numerical value register 1a and displayed on the numerical value display section 16a.

Arithmetic control unit 20 and the next pressed unit instruction key 15
The unit n written in the keypad is converted and stored in a predetermined internal register as the new unit to be found, and arithmetic processing for conversion begins.

This arithmetic processing includes the steps of reading the converted values for the two units stored in the internal registers from the memory 21, multiplying the converted values by the entered numerical values, and the product obtained by this multiplication. is output to the numerical value register 17a at the ninth stage to be displayed on the numerical value display section 16a, and the unit register 1 frame is outputted to the numerical value register 17a to display on the unit display section 16b the unit after conversion, that is, the unit related to the unit instruction key operated later. This consists of a step of outputting to b. The above-mentioned product is held as it is in the internal register of the arithmetic control unit 20 for the four arithmetic operations to be continued later.

Figure 3 conceptually shows part of the data stored in the company memory 21. The part shown in the figure shows the data content of the area in which conversion values related to length are stored, and the brightness calculation control unit 20 is configured to perform the following on the horizontal shelf in which 1 is written in the vertical column of 9 units (units before conversion), which was previously instructed. The numerical value in the vertical column of the specified unit (unit after conversion) is read out from the memory 21 as the required conversion value.

For example, when converting between meters and inches, 3,9.37 with a numeral attached is read out as the required conversion value. Note-
Some values are not given because they are not commonly used.

Next, key operations, operations, and displays will be explained using the case of converting 67 tsubo to square meters as an example. (1) Press the all clear key among the function keys 14 to enter the register in the calculation control unit 20 and the numerical register 1.
? 11 unit register l? b, etc., to erase the display contents of the display section 16. When the power switch 11 is turned on, initial clearing is automatically performed.

(2) As shown in Fig. 4 0), press “
Press the ``Tsubo'' key. The arithmetic control unit 2o recognizes the unit for which the conversion is instructed, and displays the alphabetical character “UNIT TBUBO” representing “tsubo” on the unit display unit 16b along with a stone that stores the code for “tsubo” K in the internal register. let

(3) Figure 4 ←)K As shown, □ “5” on number key 12
Press "F". "5" is stored in the internal register of the arithmetic control section 20, and "5" is displayed on the numerical display section 16a.

(4) As shown in FIG. 4(c)K, press the r square meter J key in the unit designation keys 15. The arithmetic control unit 20 stores the code corresponding to this in an internal register, and compares it with the previously input unit code. If the register storing the previous code has been cleared, or if the codes in both registers have the same content, no conversion is performed. If the two codes are different, it is determined whether they are the same type of unit or not, and if they are different units, such as "tsubo" and "meter," no conversion is performed and a specified error message is displayed. I do.

If they are the same type of units, such as "tsubo" and "r square meter" in the example, the following conversion process is performed.

(5) First, search for the required conversion value from the memory 21 using the codes of the two units involved in the conversion, and read out 3, 3 required in this case. This converted value is multiplied by the numerical value 5'7 stored in the register, and 5' x 3.
3=188.1 is obtained. Then, as shown in Fig. 4 f1, K
The calculation result "188.1" is displayed on the numerical display section 16a, and the converted unit is displayed as "UNIT MieTKR2".

As described above, the calculator of the present invention can perform accurate conversion with simple operations, and when configured to perform four arithmetic operations as well as in the embodiment, an extremely convenient calculator can be realized. .

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an external view of the inventive machine, Fig. 2 is a block diagram of its main parts, and Fig. 3 is a conceptual diagram showing a part of the stored contents of the memory. , Figure 4 (a)
, (b), e are explanatory diagrams showing key operations and display contents of the display section. 0 12...Number key 15...Unit instruction key 16...
・Display section 20...Arithmetic control section 21...Memory patent applicant Noboru Kono, patent attorney representing Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. Equipped with a memory storing conversion values between various units, a number setting means, a unit indicating means, and a display means, and the value set by the number setting means is indicated by the unit indicating means. A small-sized computer characterized in that it is configured to convert from a first unit to a second unit by referring to the memory contents, and to display this on a display means.