DE2854730A1 - Small electronic calculator for children - performs arithmetic operations by visibly allowing counter contents to accumulate - Google Patents

Abstract

The calculator has the number upon which simple arithmetic operations are to be performed generated by counting the contents of a counter up or down automatically using a special push-button. This button is depressed until the wanted number is reached. The count speed can be set, using another special push-button. The arithmetic operation to be performed is executed by letting the contents of the counter accumulate automatically using a third push-button. The numbers and the result are displayed. The numbers are generated in a low-frequency pulse generator. This frequency can be increased by the second push-button. The counter uses components of TTL-type. The advantage lies in allowing the child to see that e.g. multiplication is no more than repeated addition. Since there are relatively few push-buttons the display can be large.

Description

Small electronic calculator for children

The invention relates to a small electronic computer for children, which is mainly used as an aid in learning to count and when practicing with simple ones Basic calculations is suitable.

In electronic calculators, there is a keypad to enter the numbers with one key each for the basic numbers O to 9. For multi-digit numbers the basic numbers that determine them are entered one after the other. One time the set number cannot be corrected slightly. You can only add it enlarged according to another number, or with the help of one provided for this purpose Button can be deleted.

The handling of an electronic calculator requires even at simple calculations a certain dexterity in dealing with numbers, via which e.g. Preschoolers don't yet feature. That is why small electronic computers can to help you learn the basic arithmetic while playing, if the child has already mastered a larger range of numbers. On the other hand are Children are often fascinated by flashing numbers, so that a suitable one electronic small computers could already have a stimulating effect while learning to count.

The invention is based on the object of a small electronic computer designed in such a way that it can be used helpful when learning to count can.

According to the invention, the object is achieved in such a way that in the computer the input of the numbers by automatic counting up or down in a given The counting rhythm is carried out using the pushbuttons provided for this purpose.

In order to shorten the waiting time when setting a number in aschen cases To be able to, another pushbutton is provided, when it is additionally actuated the counting speed is increased. So that the number of Vrucktagten remains low it is advisable to set the type of calculation by automatically advancing in a defined order and just one more pushbutton to use.

According to the intended application, eg, the computer for to equip the calculation types addition, subtraction and multiplication.

The particular advantage of a small electronic computer constructed in this way consists in the fact that between learning to count and especially when practicing the Multiplication table provides assistance.

The latter because when the calculation type "Multiplication" is set automatically run through a desired multiplication series according to the multiplication table can leave. Another advantage is that because of the small number of Push buttons the glowing display can be done larger than usual is clearer for the child and therefore helps to increase attention.

Figure 1 shows the control and display panel of an electronic Small computer for children according to the invention in a preferred embodiment, where simple calculations with 2 two-digit numbers can be carried out. In the display field (1) there are display elements that light up the representation one enable simple calculation. With the key (2) the first value (4) can be scrolled through automatic up counting increased by counting down with key (3) can be reduced in size. The second value (7) is set accordingly with the buttons (5; 6). Pressing the button (8) as well takes place automatically Keep counting faster. With the key (9) the dechenart and thus the symbol (10) can be changed in recurring order.

Figure 2 shows the block diagram with the most important electronic Elements, whereby the elements already appeared in Figure 1 with the same Reference numerals are provided. For automatic counting when you press the corresponding Taste are fed into a pulse generator (11) pulses with a low frequency, e.g. of 1 Hz. With the button (8) the frequency can be increased when setting a higher number to shorten the waiting time. For automatic counting up or down the blocks (12) are used. The block (12) is a decimal reversing counter with separate clock inputs for up or down counting, e.g. type 74192 the TTL series. The outputs of these reversing counters (12) contain the respective count in binary code. To continue counting, the clock inputs of the decimal reversing counter the counting pulses can be supplied via the buttons (2; 3) or (5; 6). The transfers from the ones to the tens take place via the inputs and outputs provided for the decimal reversing counter (12).

The counter readings of the counters (12) become the arithmetic unit in binary code (13) and forwarded to the code converters (14). The code converters (14) convert the binary content in the form required for the display elements (15) used. Will Nixi tubes, for example, are used as display elements (15), then the type is 74141 from the TTL series suitable as god converter (14). The types of calculation and the associated ones Symbols +, - and x are set with the counter module (16) by repeating, automatic further counting when applying the counting impulses via key (9). For the counter module (16), which only has to have 3 different switching states, karin e.g. type 7492 from the TT series can be used. The signal for the type of calculation is forwarded from the counter module (16) to the computing unit (13) and to the code converter (17). The output signal of the counter module (16) is converted in the code converter (17) so that that the arithmetic symbol is displayed with the display element (18).

The calculation is carried out in the arithmetic unit (13).

The computing unit (13) can, for example, with the help of digital Blocks can be set up as a calculator working in parallel, or with one Microprocessor working in series.

The result in the form of binary coded decimals is then again fed to the display units via code converter.

Claims (2)

Claims: 1. Electronic small calculator for children d a d u notices that the input of the objectives with which a simple Invoice is to be executed by automatically counting up or down in a predetermined counting rhythm is carried out with the help of the pushbuttons provided for this purpose, whereby the corresponding key must be pressed until the desired Value is reached. 2.) Electronic small computer for children according to claim 1) d a d u r c h e k e n n n n z e i c h n e t that the payment speed with the help of a additional pushbutton can be changed. Small electronic computer for children according to claim 1) and 2) d a it is indicated that the calculation type is set by automatic. Continue switching in a defined order with the help of a designated Pushbutton takes place.