CN2376011Y

CN2376011Y - Calculator

Info

Publication number: CN2376011Y
Application number: CN 99207942
Authority: CN
Inventors: 李荣根
Original assignee: YUFENG DEVELOPMENT Co Ltd
Current assignee: Yufeng (Brother) Development Co., Ltd.
Priority date: 1999-04-16
Filing date: 1999-04-16
Publication date: 2000-04-26
Anticipated expiration: 2009-04-16

Abstract

The utility model discloses a calculator, which comprises press keys (42, 44, 46 and 48) for inputting instructions into the calculator, so that a central processing unit (14) can work out computed results. The utility model also comprises liquid crystal displays (31, 38 and 40) for displaying the instructions input into the calculator and the computed results. When all the instructions are input into the calculator, the calculator executes the instructions, and the intermediate results are displayed on the liquid crystal display (40).

Description

Counter

The utility model relates to counter, relates in particular to the have LCD counter of (LCD).

In a kind of common counter with LCD, this LCD is the LCD of delegation, is merely able to show the result of calculation that obtains after the instruction that the last numerical value that inputs to this counter or execution input to this counter.When to the computing of counter inputting mathematical, for example when "+", "-", " * ", " ÷ ", these mathematical operations can not be shown on LCD.In case import follow-up numerical value to counter, the numerical value that the previous numerical value that LCD shows is just imported at last replaces.With computing " 6+2 " is example.When pushing button " 6 ", LCD is with regard to display digit " 6 "."+" Shi Buhui that pushes button that is presented at of numeral " 6 " changes.When pushing button " 2 ", LCD is with a display digit " 2 ".When pushing button "=", with display digit " 8 ", i.e. the result of computing " 6+2 ".As can be seen, this common counter can not show instruction sequence and the result to its input.

In the common counter of another kind, though also show mathematical operation to its input, but still have only the numerical value of last input and last mathematical operation on LCD, to be shown.Whole instruction sequence is not shown on LCD equally.

Whether the major defect of these two kinds of common counters is that the user can not check whether he has imported correct instruction to counter, so can not check result correct.In addition, in these two kinds of counters, under the situation of only importing a false command,, otherwise need re-enter whole instruction sequence unless input is last numerical value (this can key in correct numerical value then by correcting by button " C " usually).

Therefore, the purpose of this utility model provides the counter that has overcome above-mentioned shortcoming, or the useful substitute of the counter in the prior art is provided at least.

According to the utility model, a kind of counter that comprises input media and output unit is provided, this input media inputs to described counter to instruction, so that utilize CPU (central processing unit) to calculate result of calculation, this output unit comprises LCD (LCD) device, can show the instruction and the result of calculation that input to described counter, when each bar instruction is inputed to described counter, described counter is just carried out these instructions, and utilize described output unit to show intermediate result, wherein said LCD device comprises first row and the second row LCD element at least, the instruction that inputs to described counter shows on the described first row LCD element, result of calculation shows on the described second row LCD element, the described first row LCD element is positioned on the described second row LCD element, this counter it is characterized in that the described first row LCD element each all arrange by latticed form.

Referring now to accompanying drawing, the utility model one embodiment is described for example, among the figure:

Fig. 1 represents the circuit diagram of the utility model counter;

Fig. 2 A is illustrated in the front elevation of the layout of the printed circuit board (pcb) that uses in 12 counters of the utility model;

The rear view of PCB shown in Fig. 2 B presentation graphs 2A;

Fig. 3 A is illustrated in the front elevation of the layout of the printed circuit board (pcb) that uses in 10 counters of the utility model;

The rear view of PCB shown in Fig. 3 B presentation graphs 3A;

Fig. 4 is illustrated in the block scheme of the CPU (central processing unit) of using in the utility model counter;

Fig. 5 represents the pad arrangement of CPU (central processing unit) shown in Figure 4;

Fig. 6 is the table of expression CPU (central processing unit) pad locations shown in Figure 4;

Fig. 7 is the table of expression CPU (central processing unit) lead-in wire shown in Figure 4 explanation;

Fig. 8 A is illustrated in the front elevation of 12 LCD using in the utility model counter;

The side view of LCD shown in Fig. 8 B presentation graphs 8A;

" segmentation " schematic circuit diagram design of LCD shown in Fig. 9 presentation graphs 8A;

" shared " schematic circuit diagram design of LCD shown in Figure 10 presentation graphs 8A;

The keyboard layout of Figure 11 schematic representation the utility model counter;

Figure 12 represents first sequence of operations of the utility model counter;

Figure 13 represents second sequence of operations of the utility model counter.

Because the outward appearance of counter is unessential to the utility model, so at this internal circuit configuration of counter will only be discussed.At first, the figure shows the block scheme of the utility model counter referring to Fig. 1.This counter comprises and being electrically connected with CPU (central processing unit) (CPU) 14 and as the LCD (LCD) 12 of its interface.Can see that LCD 12 is connected with several switches (SW1-SW60) of control counter operation with CPU 14.

According to the selection of manufacturer, counter can be 8,10 or 12 s' a counter.Fig. 2 A and 2B represent to be adapted at the layout of the printed circuit board (pcb) 16 that uses in 12 counters of the utility model.And Fig. 3 A and 3B represent to be adapted at the layout of the printed circuit board (pcb) 18 that uses in 10 counters of the utility model.

Can be used for CPU (central processing unit) of the present utility model is 4 microcomputer 14 ' (see figure 4)s of monolithic.Microcomputer 14 ' comprises data storage random-access memory (ram) 20, LCD (LCD) driver 22, button inputting circuits 24 and hummer port 26.By microcomputer 14 ' is connected with the external crystal (not shown), just can easily use the time signal of 1Hz to realize time clock feature.Though microcomputer 14 ' can be carried out many functions, in this description and counter function associated of the present utility model.The display size of lcd driver 22 is 60 sections * 8 row.Fig. 5 represents the pad arrangement of microcomputer 14 ', and Fig. 6 is the table of expression microcomputer 14 ' pad locations.Though the pad size of microcomputer 14 ' is 93 millimeters * 93 millimeters, chip size is 4.28 millimeters (along directions Xs shown in Figure 5) * 4.00 millimeters (along Y direction shown in Figure 5).

Translate into Fig. 7, this figure is the table of expression microcomputer 14 ' lead-in wire explanation.For K16 and K17, utilize the shielding option between button input and switch input (walking abreast), to select.Utilize the shielding option to set following lead-in wire as follows:

-button input: only when gating signal is output, can allow to import available should input release as waiting for

-switch input: only when gating signal is output, can allow to import, but can not discharge as waiting for this input

When being used as the switch input lead, input signal can not be used as waits for release.K16 and K17 can set independently of one another.For XCR, can utilize shielding to select to be fixed to Vcc or GND level.Because " TEST " (test) lead-in wire always is connected with Vcc, so should lead-in wire no user function.

Fig. 8 A and 8B be respectively Fig. 1 concise and to the point shown in the front elevation and the side view of LCD (LCD) 12.Transmission polarizer 28 and back reflection polarizer 30 before this LCD 12 comprises.By Fig. 8 A as seen, mainly contain triplex row LCD element 31,38,40.Up LCD element 31 is used for showing letter " AM ", " PM ", " F " and " K ", numeral " 4 ", " 2 " and " 0 ", makes up " Add2 ", ring icon 32, the arrow icon " → " 34 and the arrow icon " ← " 36 left to the right.Middle row LCD element 38 is arranged by ten two (12) groups, 5 * 5LCD element mode.The reason of Pai Lieing is in order to show at this row, as the mathematic sign of "+", "-", " * " and " ÷ " etc. like this.This row also shows the instruction that inputs to counter.Descending LCD element 40 shows according to the instruction of being imported when each bar instruction inputs to counter carries out the result of calculation that computing obtains, and also shows " GT " (referring to summation), " E " (referring to mistake) or " M " (referring to storer).

Fig. 9 and 10 represents " shared " concise and to the point circuit design of LCD12's " segmentation " concise and to the point circuit design and LCD12 respectively.The distribution of lead-in wire is shown in the bottom of each figure.Figure 11 represents can be used on a kind of possible layout of the keyboard in the utility model counter.

Symbol/numeral " F ", " 4 ", " 2 ", the residing decimal place of " 0 " and " Add2 " expression counter.If " F " is shown, just mean to be in the floating point function that the result of calculation of demonstration is not rounded off.When numeral " 4 ", " 2 " or " 0 " when being shown, just be rounded to selected decimal place.When symbol " Add2 " when being shown, then also automatically increase radix point and two decimal places even without the input radix point.For example, when being in " Add2 " function, if only input " 12 " also will show " 12.00 ".

The principal feature of this counter is not only can edit and revise in whole instructions (being that button "=" is not pressed) time that do not finish as yet to the instruction of its input, can also calculate and show that end product (promptly having supressed button "=") edits afterwards and revise.Can press " ← " button 42 cursor that shows on the LCD 12 is moved on to middle row LCD element 38.Press " ← " button 42 and will show the arrow icon " ← " 36 left.If the deletion numeral, just can be by " ← " button 42 and/or " → " button 44 moving cursors, till the numeral that its arrival will be deleted.Press " → " button 44 and will show the arrow icon " → " 34 to the right.Can press the relevant numeral of " DEL/CE " button 46 deletions then.If insert numeral, equally can by " ← " button 42 and or " → " button 44 moving cursors, till it just arrives the position after will inserting digit position, press correlated digital button input digit then.Can press "=" button then and obtain new result.Can change the one or more instructions relevant with the similar operation sequence with the mathematical operation that inputs to counter.

The first step sequence of computer operation as shown in figure 12.The computing of importing is " 1+2-6 * 4 ÷ 7 ".What particularly point out is for counter of the present utility model, to calculate and do not follow the rule that " * " and " ÷ " computing has precedence over "+" and "-" computing.In step 1, the counter energising, symbol " F " represents that it is in " floating point " pattern, digital " 0 " is presented in the descending LCD element 40.Press " pattern " button 48 the decimal place function is changed into " 4 ", promptly result of calculation is rounded to behind the radix point four.One presses " 1 " button, and numeral " 1 " just will be presented in the descending LCD element 40.When pressing "+" button, the demonstration of descending LCD element 40 does not change.But row LCD element 38 left-most position places showed just in the input instruction sequence during numeral " 1 " will be presented at.When pressing " 2 " button, the numeral " 1 " during symbol "+" appears in the row LCD element 38 afterwards, numeral " 2 " will replace the numeral " 1 " in the descending LCD element 40.

In step 6, press "-" button., when occurring afterwards, the symbol "+" of middle capable LCD element 38 intermediate result of " 1+2 " computing, promptly 3 is presented in the descending LCD element 40 in numeral " 2 ".In step 7, key in numeral " 6 ", numeral " 6 " is presented in the descending LCD element 40, and the numeral " 2 " of row LCD element 38 was afterwards during symbol "-" appeared at.Computing proceeds to step 12, when pressing "=" button, has just drawn end product " 0.4286 ", and this result is presented in the descending LCD element 40.

If find that now numeral " 6 " in fact should be " 8 ", then follow-up calculation step is as follows.Should press " ← " button 42, so that row LCD element 38 moving cursors in the edge.The position of cursor is represented by the flicker of relevant symbol or numeral.In case the symbol of pressing in " ← " button 42, the second row LCD elements 38 "=" just begins flicker.Press five " ← " buttons and just cursor is moved on to numeral " 6 ", promptly this numeral that shows in middle capable LCD element 38 will begin flicker.When pressing " 8 " button, the numeral of flicker " 8 " will occur in numeral " 6 " front that middle capable LCD element 38 shows.Pressing " → " button 44 will make numeral " 6 " begin flicker.When pressing " DEL/CE " button 46, numeral " 6 " will disappear, " * " sign-on flicker simultaneously.At this moment can press "=" symbol and obtain new result " 4 ".

Though showing, above-mentioned sequence of operations can change the numerical value that inputs to counter, but can change the mathematical operation that inputs to counter equally, as shown in figure 13, in step 1, imported instruction sequence " 1+2-6 * 4 ÷ 5=" to computing machine, demonstrated result " 2.4000 ", this be because as indicated in the numeral " 4 " of demonstration in the up LCD element 31, answer has been rounded to behind the radix point four cause.If finding mathematical operation " ÷ " afterwards should be "-", just can correct as follows: at first press " ← " button 42 by three times, so " ÷ " begins flicker, showing has cursor to exist.One presses " DEL/CE " button 46, and mathematic sign " ÷ " will disappear, and numeral " 5 " begins flicker simultaneously.Can press "-" button then, "-" symbol will occur in numeral " 5 " front in the middle capable LCD element 38.At this moment just can press "=" button and obtain new result " 17.0000 ", this result will be presented in the descending LCD element 40, replace previous result " 2.4000 ", shown in the step 5 of Figure 13.

Can see that the utility model provides a kind of wieldy calculator for extensive use.Especially whether the utility model allows his instruction of input of counter customer inspection correct, and the edit-modify instruction.

It should be understood that the above embodiment of the present utility model that just described, can carry out various improvement to the utility model without prejudice to marrow of the present utility model.

Claims

1. counter, comprise input media and output unit, this input media is the described counter of instruction input, so that utilize CPU (central processing unit) to calculate result of calculation, this output unit comprises LCD (LCD) device, can show the instruction and the result of calculation that input to described counter, when each bar instruction is inputed to described counter, described counter is just carried out these instructions, and utilize described output unit to show intermediate result, wherein said LCD device comprises first row and the second row LCD element at least, the instruction that inputs to described counter shows on the described first row LCD element, result of calculation shows on the described second row LCD element, the described first row LCD element is positioned on the described second row LCD element, this counter is characterised in that each of the described first row LCD element is all arranged by latticed form.

2. according to the counter of claim 1, it is further characterized in that each of the described first row LCD element is all arranged by 5 * 5 latticed forms.

3. according to the counter of claim 1 or 2, it is further characterized in that the instruction that described LCD device shows is changeable.

4. according to the counter of claim 3, it is further characterized in that the result of calculation that described LCD device shows changes with the change of instruction, and the result of calculation of change is shown by described LCD device.

5. according to the counter of claim 3 or 4, it is further characterized in that at least one inputs to the numerical value of described counter can change into numerical value inequality.

6. according to the counter of claim 3 or 4, it is further characterized in that at least one inputs to the mathematical operation of described counter can change into mathematical operation inequality.