JPH01146461A - Picture read drive device - Google Patents

Abstract

PURPOSE:To attain the miniaturization of the driver by providing a read section and a recording drive section in the same chip so as to eliminate the need for wire bonding between the read section and the recording drive section. CONSTITUTION:A picture read driver 1 is provided on a ceramic board 6 of a power application transfer head 5 and one array of photo transistors PT1-PTn are provided in a line along the outside end ridge. Moreover, output terminals 01-0n are arranged in a line along the inner side end ridge. Then the output terminals 01-0n are connected by the wire bonding comprising recording electrodes 7 and wires 8 corresponding to each on the power application transfer head 5. Thus, the wire between the read section and the recording drive section, that is, wire bonding is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image reading drive device used in a recording head of, for example, a thermal transfer printer type copying machine.

[Conventional technology]

For example, as shown in FIG. 4, a conventional digital copying machine includes a phototransistor array 21 and a CCD (charge c), which is an image sensor.

an image scanner consisting of an element 22, etc., a control circuit 23, and a thermal head driving I
C24, and a thermal head 25 which is a heating resistor. The above-mentioned image scanner constitutes a reading section, while a control circuit 23 and a thermal head driving IC 24
constitutes a recording drive section, and the above-mentioned reading section and recording drive section constitute an image reading drive device. Then, the image sensor reads the document, and based on the read image data, the control circuit 23 controls the thermal head drive IC 24, and the thermal head drive IC 24 drives the thermal head 25. It is driven to record on recording paper.

The above phototransistor array 21 and CCD element 22
are usually connected by wire bonding.

Further, the thermal head driving IC 24 uses, for example, Mitsubishi C54990, and has a built-in shift register, launch, gate, output transistor, and the like. The thermal head driving IC 24, the phototransistor array 21, the CCD element 22, and the control circuit 23 are mounted on the thermal head 25, and the thermal head driving IC 24 is wire-bonded to a wiring button on the thermal head 25. There is.

[Problem that the invention seeks to solve]

However, the conventional image reading drive device described above is configured by connecting a reading section consisting of an image scanner and a recording drive section consisting of a control circuit 23 and a thermal head driving IC 24 by wire bonding. However, this method is complicated and has problems such as cost increase.

[Means for solving problems]

In order to solve the above-mentioned problems, the image reading drive device of the present invention includes a reading section consisting of a plurality of photoelectric conversion elements that read information incident as light, and an electric motor corresponding to each of the above-mentioned photoelectric conversion elements. In an image reading drive device, the reading part and the recording driving part are the same. This is the configuration provided within the chip.

[For production]

With the above configuration, the light incident on the reading section is read by the photoelectric conversion element and output to the recording drive section. The recording drive section drives recording means such as a thermal head based on the read output. Further, since the reading section and the recording drive section are provided in the same chip, there is no need for wiring between them, that is, wire bonding.

(Example) An example of the present invention will be described below based on FIGS. 1 to 3.

As shown in FIG. 1, an image reading drive device 1 according to the present invention includes a plurality of phototransistors PT, -PT, which are photoelectric conversion elements constituting a reading section.

have. The collectors of each phototransistor PT, -PT7 are connected to the power supply voltage +
It is connected to the power supply terminal 2 supplied with Vcc. Further, the collectors of each of the phototransistors PT and ~PTn are connected to one terminal of each of the corresponding AND gates G and ~G7, and the other terminal of each of the AND gates G1 to G7 is
A 5TROB terminal 4 is connected via a knot gate 3.

This 5TROB terminal 4 serves as an input terminal for a strobe signal for controlling an output transistor Tr+=Tr, which is a driving element to be described later. The output terminals of the AND gates G, -G7 are respectively connected to the bases of the corresponding output transistors Tr+-zTrn via resistors R11-R2n.

The collector of each output transistor T r l"T r is connected to the corresponding output terminal 0. to 07. The above-mentioned NOT gate 3 and the resistor RI Im"' Rl
n, AND gate G I "" G n, output transistor Tr.

Tr and resistors R21 to RZn constitute a recording driving section, and the recording driving section and the reading section are provided in the same chip, and the image reading driving device 1 is constructed as a chip element.

As shown in FIG. 2, the above-mentioned image reading drive device l is
It is formed into a plate shape and is provided to an energized transfer head 5 which is a recording means. The image reading drive device l includes a current-carrying transfer head 5
The phototransistors PT, -PT, are arranged in a row along the outer edge of the phototransistor. Further, the output terminals 01 to Oo are arranged in a row along the inner edge. These output terminals 0. ~0. ．． is the energized transfer head 5
Recording electrodes 7... and wires 8... corresponding to each of the above
Connected by wire bonding.

The above-mentioned recording electrodes 7 are made of, for example, tungsten, and are formed on the ceramic 7tHH6 by thick film printing and subsequent firing, and are subjected to treatments such as gold plating as necessary.

The current transfer head 5 and image reading drive device 1 having such a configuration are provided in a current transfer printer type copying machine, as shown in FIG. The energization transfer plate 5 is mounted on a carriage (not shown) in an oblique state with the recording electrode 7 side facing down, and is movable in six directions of arrows.

On the other hand, the copying machine has a flat platen 9 made of an elastic member such as rubber at the bottom.
A recording paper 10 and an energized transfer film 11 are provided above, and the tip of the energized transfer head 5 is brought into pressure contact with the flat platen 9 via these members. Then, the energized transfer film 11 is sequentially fed out by a pair of winding rollers 12 equipped with a return electrode for forming a current path in the energized transfer film 11,
It is designed to be rolled up.

Further, in the vicinity of the phototransistors PT, ~PTfi of the image reading drive device l provided in the energized transfer head 5, light from the light source 14 reflected by the original 13 is directed to the phototransistors PT, ~PT, and %. Reflective mirror 15
is provided. Then, the winding roller 12.1
2. The light source 14 and the mirror 15 are mounted on a carriage, similar to the radiator 5 for electrical transfer.

In the above configuration, the print switch of the copying machine is ON.
Then, the carriage moves, and the light from the moving light source 14 is reflected by the original 13, and is sequentially transmitted through the mirror 5 to the phototransistors PT, ~P of the image reading drive device l.
is incident on T, .

When light enters the phototransistors PT, -PT,
The phototransistors PT, -))T are turned on by the reflected light from the white portion of the original 13. As a result, the power supply terminal 2 is grounded via the resistors R11 to R1 and the phototransistors PT, ~PT, and one input of the AND gate Gl-G,l becomes Low, and the AND gate G, ~G, % The output of becomes Low. Therefore, the outputs of the output transistors Tr1 to Tr are turned OFF, and the output terminals O5 to 0. The level of l is l,ow.

On the other hand, when reflected light from the black or dark portion of the document 13 enters the phototransistors PT, ~PT, the phototransistors PT, ~PT.

becomes OFF. As a result, the AND gate G+~G7
One terminal becomes High when the power supply voltage Vcc of the power supply terminal 2 is input.

Therefore, the output of the AND gate Gl-G, , is 5TRO
The 5TROB signal input to the B terminal 4 becomes [(i g h) only during the LOW period, and during this HIGH period, the outputs of the output transistors Tr, ~Tr, that is, the output terminals 0.
The level of On becomes High.

As described above, the information on the document 13 read by the image reading drive device 1 is sequentially outputted from the output terminals O6 to 07 and inputted to the recording electrodes 7 of the rad 5 for electrical transfer. Then, information is recorded on the recording paper 10 by the recording electrodes 7 and the energized transfer film 11.
Copying is done.

Furthermore, if necessary, a repetitive pulse with a pulse width Tw is applied to the 5TROB terminal 4 in synchronization with the movement of the carriage.
It is also possible to adopt a configuration in which the width of energization during a recording operation is limited to improve the recording quality.

〔Effect of the invention〕

As described above, the image reading drive device of the present invention includes a reading section made up of a plurality of photoelectric conversion elements for reading information incident as light, and a driving element corresponding to each of the photoelectric conversion elements. , an image reading drive device including a recording drive section that sends out a drive output for driving a recording means based on the output of the reading section, wherein the reading section and the recording drive section are provided in the same chip. This is the configuration that is used.

Therefore, there is no need for wire bonding between the reading section and the recording drive section, and the device can be made more compact. Therefore, it is possible to reduce costs, reduce accidents such as wire breakage, and improve the reliability of the device. As a result, when this apparatus is used, for example, in an electric transfer printer, it is possible to similarly reduce the size, reduce costs, and improve the reliability of this printer.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a circuit diagram showing an image reading drive device, and FIG. 2 is a schematic diagram of an electric transfer head equipped with an image reading drive device. FIG. 3 is an explanatory view showing essential parts of a copying machine equipped with an image reading drive device, and FIG. 4 is a block diagram showing a conventional example. 1 is an image reading drive device, 3 is a knot gate (recording drive unit), 5 is a current transfer head (recording means), 6 is a ceramic substrate, 7 is a recording electrode, 8 is a wire, PT, -PT are phototransistors ( reading unit), 01 to G are AND gates (recording drive unit), Tr, to Trn are output transistors (driving element, recording drive unit)), R11 to R1
a・R21"RZ++ is a resistor (recording drive section). Patent applicant: Sharp Corporation Kaya 1 Figure 3 ji4"! !

Claims (1)

[Scope of Claims] 1. A reading section consisting of a plurality of photoelectric conversion elements for reading information incident as light, and a driving element corresponding to each of the above-mentioned photoelectric conversion elements, and having an output of the reading section. Based on the above, an image reading drive device including a recording drive section that sends out a drive output for driving a recording means is characterized in that the above-mentioned reading section and recording drive section are provided in the same chip. Image reading drive device.