JPS63120660A - Recorder - Google Patents

Abstract

PURPOSE:To obtain images with high and uniform density, by scanning a recording head one time in a main scanning direction, and then relatively moving the head and a recording medium in an auxiliary scanning direction by the printing width of the head divided by an integer, thereby printing. CONSTITUTION:A manuscript S is placed on a manuscript base glass with the face side directed downward, and a reading head part 1 is scanned in the direction of an arrow B to read the manuscript. Image data thus read is sent to a controlling part, which controls a recording head unit 26, whereby the head unit 26 is made to record on a recording paper 21 while being scanned in the direction of an arrow P. The controlling part then moves the reading head part 1 by one half of the recording width in the direction of an arrow D, and controls a paper-feeding motor to move the paper 21 by one half of the recording width in the direction of an arrow Q, whereby recording is performed. In the first main scanning, an image is formed by a lower half part of the recording head unit 26, then the head unit 26 is moved relative to the paper 21 by one half of the recording width, and performs recording. As a result, two recording operations are performed for the same image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording device that forms an image using ink.

[Prior Art] Conventionally, in a recording device such as an inkjet device that records on a recording material using ink liquid, it has been difficult to create a good original for an overhead blogger (hereinafter referred to as 0) IP). Ta. This is due to the following reasons.

First of all, in an inkjet device, in order to maintain the ink ejection performance and prevent or reduce the viscosity of the ink liquid from increasing or drying out in the nozzles of the recording head, the ink liquid is There is a restriction that the dye density cannot be increased that much, and it is difficult to increase the density of the image by increasing the density of the ink.

Second, when recording with ink liquid on a transparent sheet used for OHP and projecting it using transmission or reflection 0) IP, the density of the projected image is different from that of the sample image recorded on plain paper. becomes thinner compared to Such a phenomenon is particularly remarkable for transmission type 0) IP.

Further, even when recording on plain paper, images with high density are often required, but the density is limited due to the first reason mentioned above.

In such a case, images may be formed in a superimposed manner by again passing the recording medium on which the original image has been recorded. However, with this method, it is difficult to register the images, and the images tend to shift easily, so it cannot be said to be a preferable method. Furthermore, even with the method of recording the same image twice as described above, even if the density is increased,
When there is density unevenness due to variations in the nozzles within the recording head, the above method is not preferred because it has the disadvantage that the density unevenness in the image is further emphasized.

[Problem to be Solved by the Invention 1] As explained above, in a recording device that performs recording using conventional ink, it is difficult to obtain an image with high image density and no density unevenness. There was a problem in that it was difficult to obtain a clear original for P.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording apparatus that can solve these conventional drawbacks and produce clear originals with improved density unevenness.

[Means for Solving the Problems] In order to achieve the above object, the recording apparatus of the present invention is a recording apparatus that performs recording by depositing ink droplets on a recording medium according to an image signal, in which a recording head is After printing a certain amount in the main scanning direction, the printing head and the recording medium move relative to each other in the sub-scanning direction by an integer fraction of the print width of the printing head to perform printing.

[Function] In the present invention, after the recording head moves a certain amount in the main scanning direction, the recording head and the recording medium move relative to each other in the sub-scanning direction by an integral fraction of the printing width of the recording head. Since printing is performed, it is possible to obtain a clear document with high density and little density unevenness.

[Example] Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing the structure of a document reader section of a recording apparatus according to the present invention.

In FIG. 1, the reading head 1 slides on a pair of guide rails 2, 2', and a document S above the apparatus.
Read. The reading head section 1 includes a light source 3 for illuminating the original, a lens 4 that forms an image of the original on a group of photoelectric conversion elements such as a CCD (not shown), and the like. 5 is a flexible conducting wire bundle that supplies power to the light source 3, power to the photoelectric conversion element, and transmits image signals and the like.

The head unit 1 includes a driving force transmitting unit 6 such as a wire for main scanning B.
is fixed. The main scanning B driving force transmission section 6 is stretched between pulleys 7, 7', and is moved by the rotation of the main scanning B pulse motor 8. The pulse motor 8 is controlled by a control section which will be described later, and as the pulse motor 8 rotates in the six directions of the arrows, the reading head 1 moves in the direction of the arrow B while being disposed perpendicular to the main scanning direction B. A row of the document S having the number of bits corresponding to the photoelectric conversion element group is read.

This read recording data is sent to a control section, which will be described later, and an image is recorded in a printer section.

After reading the required width of the original fi S, the main scanning pulse motor 8 rotates in the direction opposite to the arrow A, and the reading head 1 returns to its initial position.

A carriage 9.9' slides on a guide rail 10.10' for the sub-scanning direction, which is substantially perpendicular to the main-scanning direction B. The carriage 9' is fixed by a fixing member 13 to a driving force transmitting section 12 for the sub-scanning direction, such as a wire stretched between pulleys 11 and 11'.

After the main scanning B is completed, a sub-scanning drive source (not shown) such as a pulse motor or a servo motor moves the pulley 11 along the arrow C.
The carriage 9.9' is rotated in the direction indicated by the arrow, and the carriage 9.9' is sub-scanned in the direction indicated by the arrow by a distance specified by a control section, which will be described later, and then stopped. At this point, main scanning B is started again. By repeating this main scanning B and sub-scanning, it becomes possible to read the entire document image area.

By the way, the carriage 9' has rails 2.2 for main scanning B.
′ is fixed, the sub-scanning position detection unit 14
is installed. The detection unit 14 includes an imaging means 16 such as a lens array that projects the scale 15 onto a group of photoelectric conversion elements (not shown) such as a multi-bit linear CCD, and a light source 17 that illuminates the scale 15. ing.

The scale 15 is fixed to the main body of the reader section (not shown), and indicators 18 are provided at intervals d approximately equal to the image reading width at 8 times of main scanning. Illuminated by a light source 17 for the detection section,
The two illuminated indicators 18 are imaged through the lens 16 onto a photoelectric conversion element (not shown). Based on the position data of the carriage 9' obtained in this way, a control section, which will be described later, controls the sub-scanning.

Next, the printer section of the recording apparatus according to the present invention will be explained using the drawings.

FIG. 2 is a perspective view of the printer unit equipped with a bubble jet recording head, in which recording paper 2 is wound into a roll.
1 passes through conveyor rollers 22 and 23, and then a feed roller 2 is driven by a paper feed motor controlled by a control section which will be described later.
4, and is fed by the rotation of the feed roller 24. The conveyance path of the recording paper 21 is regulated by guide rails 27 and 28 arranged parallel to each other, and the recording head unit 26 mounted on the carriage 25 is scanned left and right parallel to the guide rails 27 and 28. Ru. The carriage 25 has heads 26G and 28M that eject cyan, magenta, yellow, and black ink, respectively.
, 28Y.

26B is mounted on the carriage 25, and four color ink tanks for supplying ink to each of these heads are also mounted on the carriage 25. The recording paper 21 moves in the Q direction with a width specified by a control unit, which will be described later. When the recording paper 21 stops, the recording head unit 26 scans left and right, and when scanning in the P direction in the figure, as will be described later. The recording heads 26G, 26M, 26Y, 2 are controlled according to the image signal output from the control section.
Ink droplets are ejected from 8B.

Here, the reason why recording is performed only in one direction of main scanning as in this embodiment is because color copying machines use ink liquids of four colors, yellow, magenta, cyan, and black, and the recording order depends on the recording order. This is because it is known that there is a difference in hue. It is known that this phenomenon occurs not only in inkjet apparatuses such as the present embodiment, but also in methods using toner such as electrophotography and thermal transfer methods, in which the hue changes depending on the recording order of color inks. Therefore,
In a color printing apparatus, if reciprocating printing is performed as in the case of monochrome printing, there will be a difference in the hue of the image between forward and backward printing, so printing is always performed in only one direction.

FIG. 3 shows an example of the configuration of the control system of the apparatus according to this embodiment shown in FIGS. 1 and 2. 30 is, for example, a CPU,
A control section in the form of a microcomputer having ROM, RAM, etc. controls each section according to processing procedures stored in the ROM, and controls the recording head unit 26 according to image data input from the reader section 31 to perform printing. 32
is the recording width switching procedure. The recording width switching means 32 allows the reader section 31 to read the document and the printer section to control the amount of movement of the recording paper 21. In other words, the user can switch the recording width to decide whether to read and record in units of recording width in one scan of the recording head unit 26, units of 172 recording widths, or units of 173 recording widths. The selection can be made by means 32. The control section 30 controls the paper feed motor 33 that drives the feed roller 24 (second illustration) and the reader section 31 in accordance with the output of the recording width switching means 32.

Next, the operation of this embodiment configured as above will be explained.

First, the recording width switching means 32 reads the document on the reader section 31 and switches the recording paper 21 in units of 172 recording widths in which recording is performed in one scan of the recording head unit 26.
An example will be explained in which a selection is made to perform the following.

In this case, in FIG. 1, the document S is placed face down on a document table glass (not shown), and the reading head section 1 scans in the B direction to sequentially read the document from the end. The image data read in this way is sent to the control section 30. In response to the main scanning of the reader section 31, the control section 30 controls the recording head unit 26 of the printer section to perform recording on the recording paper 21 while scanning in the P direction.

Next, the control section 30 controls the reading head section 1 of the reader section 31.
is moved in the D direction by 1/2 of the recording width, and the paper feed motor 33 is controlled to move the recording paper 21 in the Q direction by 172 of the recording width. Then, the recording process as described above is performed. Thereafter, such operations are repeated.

The above operation will be explained using the recording paper 21 on which images are recorded.

As shown in FIG. 4, when recording the first line (■), the recording area of the recording paper 21 is covered by the recording head unit 2.
Since only the lower half of the recording head unit 6 is included, the image is formed by the lower half of the recording head unit 26 in the first main scan.

Next, the recording head unit 26 moves relative to the recording paper 21 by a recording width of 172, and performs recording as it moves in the main scanning direction (■). The recording head unit 26 repeats this scanning.

(2) As a result, the same image will be recorded twice.

As described above, in this embodiment, since the same nozzle of the print head does not print in the same place again, there is an effect that density unevenness in the image due to nozzle variations is reduced. Furthermore, the CCD of the reading head of the reader section
Even if there are variations in the density, the density unevenness caused by the variations can be reduced.

FIG. 5 shows that the recording width switching means 32 allows the
FIG. 3 is an explanatory diagram for explaining a state in which image recording is performed when it is selected that the reader unit 31 reads the document and the printer unit moves the recording paper 21 in units of 3.

Processing similar to that described with reference to FIG. 4 is performed in the order of ■-■-■-■ shown in FIG.

However, here, the amount of movement wJ of the recording paper 21 is l/of the recording width.
3, the same image is recorded three times, and an image with higher density can be obtained.

In this embodiment, an explanation has been given of an apparatus in which a reader unit reads a document and an image is recorded by a recording head as a recording device, but the present invention is not limited to the above embodiment. It may also be a recording device that records images.

[Effects of the Invention] As explained above, according to the present invention, it is possible to obtain an image with high density and less density unevenness, and particularly clear 01
The effect is that a 1P original can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of the configuration of a reader section of a recording device according to the present invention. FIG. 2 is a configuration diagram showing a configuration of a printer section of a recording device according to the present invention. FIG. A block diagram showing the configuration of a control system of the recording apparatus. FIGS. 4 and 5 are explanatory diagrams for explaining the recording state of the recording apparatus according to the present invention. l...reading head section, 9.9', 25...carriage, 11...pulley, 12...driving force transmission section, 14...detection section, 15...scale, 16. ... Lens, 17... Light source, 18... Index, 2I... Recording paper, 22. 23... General feed roller, 24... Feeding roller, 26... Recording head unit, 26 , 26M, 26Y, 26B...recording head, 3
0...Control unit, 31...Reader unit, 32...Recording width switching means, 33...Paper feed motor. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] In a recording device that performs recording by depositing ink droplets on a recording medium according to an image signal, after a recording head makes one scan in the main scanning direction, an integral number of the printing width of the recording head is provided. 1. A recording apparatus characterized in that the recording head and the recording medium move relative to each other in a sub-scanning direction to perform printing.