Calculator with equation display device
First Claim
Patent Images
1. An equation display device for a calcuator, comprising:
- a key input section including at least numerical entry keys and function keys of +, -, ×
, ÷
, etc., for inputting numeral data and function data according to a calculation equation;
a memory coupled to said key input section for storing the numeral data and function data inputted from said key input section;
calculating means coupled to said memory for performing a calculation, according to the calculation equation, based on the data stored in said memory;
a display section coupled to said calculating means for displaying a result of calculation outputted from said calculating means;
input control means coupled to said memory for judging the data inputted by the operation of said numerical entry keys and said function keys of said key input section and for performing a key input processing;
character equation preparing means coupled to, and controlled by, said input control means for treating the data inputted by said key operation according to the calculation equation such that each numeral data is replaced by respective character data in the order of inputting of the numeral data, and for preparing display data so that the inputted calculation equation is displayed in the form of a character equation;
a display register coupled to said character equation preparing means for sequentially storing the character equation display data prepared by said character equation preparing means; and
display control means coupled to said display register and responsive to said character equation display data outputted from said display register for displaying the character equation on said display section.
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Abstract
A calculator in which when numerical information and function information are sequentially input using ten keys and function keys of a key input section for obtaining a calculation result according to a calculation formula, the input information is stored in a memory. The operation is then performed and, simultaneously, a character formula universally representing the calculation formula with the input numerals replaced with characters is prepared. This character formula is displayed by the display section so that the input condition may be easily confirmed and input errors may be prevented with certainty.
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Citations
21 Claims
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1. An equation display device for a calcuator, comprising:
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a key input section including at least numerical entry keys and function keys of +, -, ×
, ÷
, etc., for inputting numeral data and function data according to a calculation equation;a memory coupled to said key input section for storing the numeral data and function data inputted from said key input section; calculating means coupled to said memory for performing a calculation, according to the calculation equation, based on the data stored in said memory; a display section coupled to said calculating means for displaying a result of calculation outputted from said calculating means; input control means coupled to said memory for judging the data inputted by the operation of said numerical entry keys and said function keys of said key input section and for performing a key input processing; character equation preparing means coupled to, and controlled by, said input control means for treating the data inputted by said key operation according to the calculation equation such that each numeral data is replaced by respective character data in the order of inputting of the numeral data, and for preparing display data so that the inputted calculation equation is displayed in the form of a character equation; a display register coupled to said character equation preparing means for sequentially storing the character equation display data prepared by said character equation preparing means; and display control means coupled to said display register and responsive to said character equation display data outputted from said display register for displaying the character equation on said display section. - View Dependent Claims (2, 3, 4, 5)
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6. An equation display device for a calculator comprising:
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a key input section including at least numerical entry keys and function keys of +, -, ×
, ÷
, etc., for inputting numeral data and function data according to a calculation equation;a memory coupled to said key input section for storing the numeral data and function data inputted from said key input section; calculating means coupled to said memory for performing a calculation, according to the calculation equation, based on the data stored in said memory; a display section coupled to said calculating means for displaying a result of calculation outputted from said calculating means; input control means coupled to said memory for judging the data inputted by the operation of said numerical entry keys and said function keys of said key input section and for performing a key input processing; character equation preparing means coupled to, and controlled by, said input control means for treating the data inputted by said key operation according to the calculation equation such that numeral data is replced by character data in the order of inputting of said numeral data and for preparing display data so that the calculation equation is displayed in the form of a character equation; a display register coupled to said character equation preparing means for sequentially storing the character equation display data prepared by said character equation preparing means; display control means coupled to said display register and responsive to said character equation display data outputted from said display register for displaying the character on said display section; and means coupled to said character equation preparing means for designating arbitrary characters in the character equation displayed on said display section and for causing data corresponding to the designed characters to be called from said memory to supply said called data to said display control means. - View Dependent Claims (7, 8, 9, 10)
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11. An equation display device for a calculator, comprising:
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a low input section including at least numerical entry keys and function keys of +, -, ×
, ÷
, etc., for inputting data and function data according to a calculation equation;a memory coupled to said key input section for storing the numeral data and function data inputted from said key input section; calculating means coupled to said memory for performng a calculation, according to the calculating equation, based on the data stored in said memory; a display section coupled to said calculating means for displaying a result of calculation outputted from said calculating means; input control means coupled to said memory for judging the data inputted by the operation of said numerical entry keys and said function keys of said key input section and for performing a key input processing; character equation preparing means coupled to, and controlled by, said input control means for treating the data inputted by said operation according to the calculation equation such that each numeral data is replaced by respective character data in the order of inputting the numeral data, and for preparing display data so that the inputted calculation equation is displayed in the form of a character equation; a display register coupled to said character equation preparing means for sequentially storing the character equation display data prepared by said character equation preparing means; display control means coupled to said display register and responsive to said character equation display data outputted from said display register for displaying the character equation on said display section; and means coupled to said character equation preparing means for designating arbitrary characters in the character equation displayed on said display section and for modifying the data in said memory corresponding to the designated characters. - View Dependent Claims (12, 13, 14, 15)
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16. An equation display device for a calculator, comprising:
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a key input section including at least numerical entry keys and function keys +, -, ×
, ÷
, etc., for inputting numeral data and function data according to a calculation equation;a memory coupled to said key input section for storing the numeral data and function data inputted from said key input section; calculating means coupled to said memory for performing a calculation, according to the calculation equation, based on the data stored in said memory; a display section coupled to said calculating means for displaying a result of calculation outputted from said calculating means; input control means coupled to said memory for judging the data inputted by the operation of said numerical entry keys and said function keys of said key input section and for performing a key input processing; character equation preparing means coupled to, and controlled by, said input control means for treating the data inputted by said key operation according to the calculation equation such that each numeral data is replaced by respective character data in the order of inputting of the numeral data, and for preparing display data so that the inputted calculation equation is displayed in the form of a character equation; a display register coupled to said character equation preparing means for sequentially storing the character equation display data prepared by said character equation preparing means; designating means connected to said character equation preparing means for designating arbitrary characters in the character equation displayed on the display section; and display control means coupled to said display register and responsive to said character display data outputted from said display register for causing displaying of the character equation on said display section and for causing, at the same time, the characters designated by said designating means to be displayed on said display section in a manner as to distinguish them from the other characters displayed on said display section. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification