JPS5922990Y2 - small printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small printer that selectively prints typefaces containing characters, symbols, etc. using an electromagnet.

For details, please refer to the equipment (e.g. electronic desk calculator (calculator),
It relates to small printers as output devices for cash registers, microcomputers, etc., and is particularly concerned with I2L (INTEGRATED INJECTION) that obtains parallel output signals using a small printer driver and serial manual.
The present invention relates to a small printer having a register drive circuit in which a drive circuit consisting of a LOGIC (hereinafter referred to as I''L) is integrated on the same chip.

A conventional example in which a printer is used as an output device for a calculator is shown in FIG. 1 and will be described.

1 is a typeface having letters, symbols, etc.; 2 is a typeface axis; 3 is a character screen having slits corresponding to the characters.

Numeral 4 is a light emitting element that generates a character signal together with the screen 3, and the character signal is amplified and sent to the circuit means [central control unit (C, P
, U) 15 or a printer controller (not shown)].

A reference disc 7 is attached to the other end of the type body shaft 2 and has a slot 1 corresponding to the reference position of the type body 1.

Reference numeral 8 denotes a light emitting element 1'-19 is a light receiving element which together with the disk generates a reference signal, which is amplified by an amplifier 10 and connected to circuit means (for example, a central control unit 15).

Reference numeral 11 denotes an electromagnet, and when the desired character comes to a position directly below or opposite a platen mark or the like, the electromagnet 11 is energized to select the desired character.

The printing means may be any of the generally known type wheel selection 7-r type, muffling type, etc. For example, if the type wheel selection type is used, after selecting the desired character by energizing the electromagnet 11, There is a type that prints using a platen, etc., and there is also a /S machine flying method, where when the desired character comes directly to the point F of the hammer, the electromagnet 11 is energized to cause the character to fly and print. .

12 is a diode that serves as a spark killer for the electromagnet 11.

Reference numeral 13 is a drive circuit for the electromagnet 11, and since the output signal 24 of the parallel output circuit means (for example, the central control unit 15), which is usually made of MO3-■C, is as small as f1mA,
Drive current signal 2 of electromagnet 11 that requires about 100mA
It has the ability to amplify up to 3.

Further, information and calculation commands from the keyboard recess 6 are processed by the central control unit 15 to the drive circuit 13, and the content to be printed to the printer is sent as an output signal 24.

The sent information is output in parallel to drive the necessary electromagnets 11, resulting in printing.

17 is an external memory provided as necessary.

Here, the reason why the conventional drive circuit 13 is an IC composed of bipolar transistors and is separated from the LSI (MOS-IC) of the circuit means (for example, the central control unit 15) is as follows.

First of all, the maximum output current of MOS-IC is about 10mA,
Two, the drive current of the bipolar transistor is large enough, but the circuit means (e.g. central control unit or printer controller) cannot directly drive the electromagnet 11;
Three problems were that the integration level was low and the chip area was large to configure with TTL, making it uneconomical.Three problems were that it was difficult to mix MOS-IC and bipolar 1-transistor in terms of chip configuration. It had

The object of the invention is to reduce the number of output lines from the circuit means (for example C, P, U (central control unit) or printer controller) for controlling a small printer or device to the printer.

Another object of the present invention is to improve reliability and reduce cost by equipping the printer with a register drive circuit.

The present invention solves all the previous problems and obtains new advantages by configuring the register based on the 2L element f and the drive circuit based on the bipolar transistor on the same chip.

The present invention will be explained using FIG. 2.

The same numbers as in FIG. 1 have the same operations or functions, so the explanation will be omitted.

Reference numeral 18 denotes a drive circuit with a register, which in this embodiment is a circuit means for processing information and calculation commands from the keyboard 16 and controlling a small printer or a device with a small printer [e.g.
Roller to printer controller 1, central control unit (C, P, U
) 15] is manually inputted to the register drive circuit 18.

This human input signal (output signal 25) is normally aligned by one word in the register drive circuit 18, amplified into a drive current that can directly drive the electromagnet 11, and outputted in parallel as an output signal 23. is driven, and as a result, desired characters, symbols, etc. are printed.

Next, the registers are illustrated in the schematic diagram of FIG.
An example of a state checker method will be explained.

30 is a flip-flop, 33 is a terminal to reset 1, 34 is a parallel output for temporary storage, and 35 is a control terminal.

Here, the register receives a serial output signal 25 from a circuit means (in this embodiment, the central control unit 15) at an input terminal 31, and operates a flip-flop 30 or the like to obtain a parallel output 34.

This invention is based on the idea of creating this register with an I2L element, creating a drive circuit with a bipolar transistor to a transistor, and integrating these on the same chip to create an LSI or IC with a drive circuit with a register built into a small printer. This is the gist of

Here, 2L will be explained using FIG.

a is the configuration and b is the equivalent circuit.

The features of I''L are as follows: (1) The load resistance is a PNP I-transistor with a lateral structure, and high integration can be achieved since isolation is not required.

■ The load is a full current PNP I-transistor, and the operating voltage is NPN1~VBE of the transistor.
The voltage (0.6V) or lower is sufficient, and the low voltage results in low power consumption.

etc. can be mentioned.

Therefore, if you make the register shown in Figure 3 using ■2L elements,
It can be an LSI or IC with a small chip area and low power consumption.

10. As explained in detail, the output terminals from the conventional circuit means to the printer were parallel outputs, so at least ten or more were required, and an LSI that uses the circuit means requires the same number of terminals. Therefore, having a large number of output terminals to the printer was a very important advantage in LSI design, but as in the present invention, by taking out the serial-to-parallel conversion register from the circuit means, the circuit means can be easily integrated. The number of terminals on an LSI package is greatly reduced.

For example, the number of outputs to the precipitator may be at least one, or usually within 2 to 4, which is the number of conventional terminals, ~j.

Circuit means for controlling the printer (central control unit 15)
By significantly reducing the number of output lines, the circuit means (central control unit 15) can now drive display elements such as liquid crystals, and the number of keys can be increased to create a programmable calculator. becomes possible.

Furthermore, since the bipolar transistor and the manufacturing process are the same, it is extremely easy to coexist with the 2L element and the bipolar transistor.

As a result, the register using the I2L element and the drive circuit using the bipolar transistor are integrated on the same chip, and the register-equipped drive circuit 18 can be easily formed into an LSI or an IC.

Furthermore, since the present invention is integrated into the same chip and manufactured at the same time in the same process, it is possible to suppress variations in the saturation voltage of transistors, stabilize printer operation, and reduce energy to the electromagnet. Since it becomes constant, it is also possible to speed up the printing operation.

Furthermore, when the drive circuit with a register is installed on the Punonta side as in the present invention, the conventional drive circuit 13 shown in FIG.
Since the connection wire 24 between the register 14 and the printer 14 can be eliminated, reliability can be improved by reducing the number of connection points between the printer and the board, and the cost can be reduced by reducing the number of connectors and cables.

(2) In an IC using a 2L element, the diode 12 which is a spark killer can also be incorporated with a resistor drive circuit 18, so the structure of the calculator becomes simple.

The present invention is applicable not only to printing methods using electromagnetic means but also to a wide range of printers that drive serial inputs in parallel mode.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional printer used with a calculator output device. FIG. 2 is a block diagram of a printer used as an output device of a calculator to explain an embodiment of the present invention. FIG. 3 is a diagram showing an example of a serial/parallel register for explaining an embodiment of the present invention. FIG. 4 is a diagram for explaining 2L used in an embodiment of the present invention, in which a is a structural diagram and b is an equivalent diagram. 11...Electromagnet, 15...Central control unit, 16...Keyboard, 17...External memory, 18...Drive circuit with register .

Claims (1)

[Scope of utility model registration request] In small printers built into equipment such as telegraph equipment, I2L (INTEG
RATED INJECTION LOGIC) device and a drive circuit consisting of a bipolar transistor that manually amplifies the parallel output signal of the register and obtains a drive signal, which are integrated on the same chip. 1. A small-sized printer characterized in that it incorporates electromagnetic means for selecting or printing typefaces driven by a driving signal.