JP3053215U - Calculator - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of key operations in checking after calculation of a relatively long arithmetic expression performed in accounting and statistics, and to enable a numerical value to be changed with few key operations. A forward check key, a reverse check key, and a change key are arranged adjacent to a surface of a case main body on which various keys are arranged, below a liquid crystal panel.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a calculator that performs four arithmetic operations used in companies, schools, homes, and the like.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there has been known a calculator in which various keys such as a switch key, numeral keys, and four arithmetic keys, and a liquid crystal panel for displaying a calculation process and a calculation result are arranged on a thin case body surface. The values entered by key operation are displayed on the liquid crystal panel, stored in a storage device built in the case body, calculated by the arithmetic unit, and the result is displayed on the liquid crystal panel from the output device. It has become so.

[0003]

[Problems to be solved by the invention]

 By the way, in such a conventional calculator, when checking the calculation result, make a note of the calculation result, delete the calculation result from the LCD panel with the clear key, and then use the numeric keys again from the beginning of the calculation formula. The same operation was repeated with the four arithmetic keys. Also, if there is a numerical error in the first or second time, the calculation results naturally do not match, so that the third calculation has to be performed. Furthermore, if the user notices an input error that has already passed during the calculation, the only option is to stop the calculation and start over from the beginning. Therefore, there is a problem that when calculating accounting and statistics with a large number of data and checking the calculation result, it is unavoidable to perform the same operation at least twice, and it takes a lot of time.

[0004] Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a calculator that does not require much trouble when checking an operation result. is there.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 is based on a calculator in which a liquid crystal panel and various keys such as numeric keys, four arithmetic keys, and memory keys are arranged on a surface. It is equipped with a check key for redisplaying the four types of rules, numerical values and equal signs, and calculation results.

According to a second aspect of the present invention, the check key is constituted by a forward check key for checking from the beginning of the operation process and a backward check key for checking backward from the end.

According to a third aspect of the present invention, a change key for changing a numerical value during the check is provided.

[0008]

[Embodiment of the invention]

 Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a front view of a calculator according to the present invention, FIG. 2 is an explanatory view showing a liquid crystal panel when a check is performed upward from the end of an arithmetic expression, and FIG. 3 is a check performed from the beginning of an arithmetic expression. FIG. 4 is an explanatory diagram showing a liquid crystal panel in a case where a numerical value is changed during a check.

In FIG. 1, a liquid crystal panel 2 forming a display portion is provided on the surface of a case body 1, a forward check key 3 and a reverse check key 4 used for checking below the display panel, and used for changing numerical values. A change key 5 is arranged, and various well-known keys 6 such as a numeric key, a memory key, and an arithmetic operation key are arranged below them. Further, a well-known storage device, arithmetic device, output device, and the like (not shown) are housed in the case body 1. When the calculator is operated using various keys and the numerical values in the arithmetic expression and the four arithmetic operation keys are input, generally, the numerical value of each input is displayed on the liquid crystal panel 2, and finally when the equal key is pressed, the operation result appears. It is done by.

Next, the check operation will be described with reference to FIGS. 2 and 3, taking the arithmetic expression 9 + 8 + 7 + 6 as an example. In FIG. 2, the liquid crystal panel 2 shown at the top displays the calculation result by an equal sign 21 at the lower left end and a numerical value 22 at the right end. When the reverse check key 4 is pressed for checking, the last operation of the arithmetic expression is displayed as the number of times "4" 23 at the upper left end on the liquid crystal panel 2 as shown in the second row, and the type of the four rules is "+" at the lower left end. At 24, a numerical value "6" 25 at that time is displayed at the right end, and "UNDO" 26 indicating that the reverse check key 4 is being operated is displayed above the center. When the reverse check key 4 is further pressed, the display on the liquid crystal panel 2 shown in the third row changes, and “3” 27, “+” 28, and “7” 29 at the time of the third key operation are at the same position. appear. Similarly, when the reverse check key 4 is kept pressed, the data at the time of the second and first key operations are displayed on the liquid crystal panel 2 shown at the fourth and fifth rows, respectively, and finally the calculation result is displayed at the fifth key. The operation is shown on the liquid crystal panel 2 shown in the sixth row, and the check is completed. In this case, the order of the check progresses backward from the end of the operation expression.

In FIG. 3, the order of the check proceeds from the beginning of the arithmetic expression. For this reason, the forward check key 3 is operated, and “REDO” 31 is displayed on the center right of the liquid crystal panel 2. The same is true.

According to this configuration, the reverse check key 4 and the forward check key 3 for checking are provided, so that simply by operating these keys, the contents of the arithmetic expression are displayed in the order of the terms, and the document is displayed. Checks can be made simply by comparing with the above formulas and lists, and it is not necessary to compare all of the formulas with the calculation results after re-operating the numeric keys and the four arithmetic keys, greatly reducing the number of operations. Also, it has two types of check keys, a forward check key 3 and a reverse check key 4, so it is possible to input in the order of arithmetic expressions and items in the list, and when the result comes out, go back and check from that position. If there is a concern that there is a mistake in the key operation, if it is the first half of the calculation formula or list, select the forward check key 3 and if it is the second half, select the reverse check key 4 so that the check process can be performed earlier. Can complete the correction.

Further, a case where a numerical value is changed in the middle of a check will be described with reference to FIG. 4, taking the arithmetic expression 9 + 8 + 7 + 6 as an example. In FIG. 4, the same calculation result as that of FIG. Then, when the reverse check key 4 is pressed, the number 43 of the last calculation process, the type 44 of the four rules, the numerical value 45, and the type 46 of the check key are displayed on the liquid crystal panel 2 shown in the second row. Here, when the numerical value 6 is actually an input error and the user wants to change the numerical value to 5, the change key 5 is first pressed. Then, "EDIT" 47 is displayed on the liquid crystal panel 2 shown in the third row. After that, when "5" is entered by using the numeric keys, the liquid crystal panel shown in the fourth row changes from "6" to "5". When the equal key is further pressed, the changed calculation result “29” 48 appears on the liquid crystal panel 2 shown in the fifth row.

According to this configuration, since the change key 5 is provided, a portion to be changed is displayed only by operating the forward check key 3 or the reverse check key 4, and after the change key 5 is pressed, the numerical value after the change is displayed. You can change the value just by typing. Therefore, the number of key operations is significantly reduced as compared to re-entering all the arithmetic expressions with the changed numerical values.

In the present embodiment, various changes are possible, and the number of operations by operating the forward check key 3, the reverse check key 4, the change key 5, the four rules and the forward check, the reverse check, and the type of the change key A liquid crystal panel for displaying only the key may be provided independently, and the arrangement of various keys may be freely changed.

[0016]

[Effect of the invention]

 As described above, according to the calculator according to the present invention, the forward check key, the reverse check key, and the change key for change are provided for the check, so that the check key for relatively long calculations such as accounting and statistics is provided. The number of operations can be greatly reduced.Also in the case of a change, the changed part is easily displayed by the forward check key or the reverse check key, and only the changed part can be changed using the change key, which significantly reduces the number of key operations. I do.

[0017]

[Brief description of the drawings]

FIG. 1 is a front view of a calculator according to the present invention.

FIG. 2 is an explanatory diagram showing a liquid crystal panel when a check is performed backward from the end of an arithmetic expression.

FIG. 3 is an explanatory diagram showing a liquid crystal panel when a check is performed from the beginning of an arithmetic expression.

FIG. 4 is an explanatory diagram showing a liquid crystal panel when a numerical value is changed during a check.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 Liquid crystal panel 3 Forward check key 4 Reverse check key 5 Change key 21,41 Equal 24,28,44 Four types 26,45 UNDO 31 REDO 47 EDIT

Claims (3)

[Utility model registration claims] 1. A calculator in which various keys such as a liquid crystal panel and numeric keys, four arithmetic keys, and a memory key are arranged on the surface. A calculator comprising a check key for redisplaying a calculation result. 2. The calculator according to claim 1, wherein said check key comprises a forward check key for checking from the beginning of a calculation process and a backward check key for checking backward from the end. 3. The calculator according to claim 1, further comprising a change key for changing a numerical value during the check.