Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Having specialized input
Reexamination Certificate
1998-04-10
2001-02-27
Ngo, Chuong Dinh (Department: 2787)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Having specialized input
C708S146000
Reexamination Certificate
active
06195671
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electronic computing apparatus such as an electronic portable calculators and an electronic pocketbook, capable of carrying out an arithmetic operation in accordance with a functional expression or equation, and to an arithmetic processing method.
2. Description of Related Art
Hitherto, there have been known electronic computing apparatuses capable of processing an arithmetic operation in accordance with a functional expression or an equation. Such computing apparatus comprises an input section and executes the arithmetic processing in accordance with a functional expression or equation when such expressions are inputted and it is specified to execute the arithmetic processing. The result of the arithmetic processing is displayed as a graph or the like on a display for example provided in the computing apparatus.
The above-mentioned functional expression or equation is inputted by using a plurality of numeric keys, symbol keys and arithmetic symbol keys provided at the input section. For instance, they are inputted by using trigonometric function keys of sin, cos and tan, inverse trigonometric function keys of sin
−1
, cos
−1
, tan
−1
, a x
2
(square) key, a x
−1
(inverse number) key, logarithmic function keys of log and ln, exponential function keys of 10
x
and e
x
, a &pgr; (ratio of the circumference of a circle to its diameter) key, an a/b (fraction) key, an a
b
(power) key, a {square root over ( )} (square root) key, a
a
(radical root) key, an abs (absolute value) key, a n! (factorial) key, a nCr (combination) key, a nPr (permutation) key, hyperbolic function keys of sin h, cos h and tan h, inverse hyperbolic function keys of sin h
−1
, cos h
−1
, tan h
−1
, an ∫ (integral function) key, numeric keys of 0 through 9, keys of four fundamental rules of +, −, ×, ÷ and (,) and alphabet keys. A technology for inputting an arithmetic expression by using such plurality of keys has been disclosed in Japanese Unexamined Patent Publication JP-A 61-269764 for example.
However, it has been troublesome and annoying for users to complete and to input such a functional expression or an equation by selecting desired keys among such many keys as described above to cause the electronic computing apparatus to execute the arithmetic processing in accordance with the functional expression or the equation.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electronic computing apparatus having an arithmetic processing function, in which an arithmetic expression can be easily inputted, and an arithmetic processing method.
The present invention provides an electronic computing apparatus having an arithmetic processing function, the apparatus comprising:
arithmetic expression selecting means for selecting one arithmetic expression from among a predetermined plurality of arithmetic expressions; and
arithmetic processing means for executing arithmetic processing in accordance with the arithmetic expression selected by the arithmetic expression selecting means.
According to the invention, the arithmetic expression may be selected from the predetermined plurality of arithmetic expressions by the arithmetic expression selecting means and the arithmetic processing may be executed in accordance with the arithmetic expression thus selected. Accordingly, the arithmetic expression may be readily inputted just by selecting the arithmetic expression from the plurality of arithmetic expressions.
The invention is characterized in that the arithmetic expression selecting means includes an arithmetic expression table for storing the predetermined plurality of arithmetic expressions, and arithmetic expression specifying means for specifying an arithmetic expression, and selects the arithmetic expression specified by the arithmetic expression specifying means from among the predetermined plurality of arithmetic expressions stored in the arithmetic expression table.
According to the invention, the arithmetic expression may be readily inputted by selecting the arithmetic expression from the arithmetic expression table for storing the predetermined plurality of arithmetic expressions.
The invention is characterized in that the electronic computing apparatus further comprises arithmetic expression table displaying means for displaying the arithmetic expression table.
According to the invention, since the arithmetic expression table is displayed, a desired arithmetic expression may be inputted while seeing all the arithmetic expressions.
The invention provides an arithmetic processing method of an electronic computing apparatus, comprising the steps of:
selecting one arithmetic expression from among a predetermined plurality of arithmetic expressions; and
executing arithmetic processing in accordance with the selected arithmetic expression.
According to the invention, the arithmetic processing is executed in accordance with the selected arithmetic expression by selecting the arithmetic expression from the predetermined plurality of arithmetic expressions, so that the arithmetic expression may be readily inputted.
The invention is characterized in that all selectable arithmetic expressions are displayed in selecting an arithmetic expression.
According to the invention, it is possible to input a desired arithmetic expression while watching all the arithmetic expressions which can be selected.
REFERENCES:
patent: 4481598 (1984-11-01), Ishiwata
patent: 5008847 (1991-04-01), Lapeyre
patent: 5594673 (1997-01-01), Coffin
patent: 61-269764 (1986-11-01), None
Ito Matsutaka
Kawawaki Fumiaki
Ngo Chuong Dinh
Nixon & Vanderhye P.C.
Sharp Kabushiki Kaisha
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