JPS6067166A - Ink jet recording method - Google Patents

Abstract

PURPOSE:To provide a clear projected picture indicating a sufficient picture concentration by recording with a means to cause adhesion of two pieces or more of recording liquid droplet per one picture element when a method to record a picture through adhesion of a recording liquid to photopermeable material to be recorded is employed. CONSTITUTION:Recording is carried out by causing adhesion of two pieces or more of recording liquid droplet of the same color per one picture element when an ink jet recording method to cause adhesion of recording liquid droplets to photopermeable material to be recorded is employed. As a means to cause adhesion of two pieces or more of recording liquid droplet of the same color in a picture element, the first recording liquid droplet is caused to adhere to all the picture elements to be recorded and then the second recording liquid droplet to all the picture elements covered with the first recording liquid droplet. This process is repeated to cause further sequential adhesion of recording liquid droplets of the same color. As an alternative means, the first recording liquid droplet, the second recording liquid droplet and the third recording liquid droplet are caused to adhere to every picture element sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recording an image on a translucent recording material by an inkjet recording method, and in particular, a method for recording an image on a translucent recording material when the image is projected with light. The present invention relates to an inkjet recording method capable of obtaining clear projected images with high image density.

Inkjet recording methods include various types of recording methods, such as an electrostatic suction method using high voltage application, a method that applies mechanical vibration or displacement to the recording liquid using a piezoelectric element, and a method that uses the pressure of heating and foaming the recording liquid. This recording method generates small droplets of recording liquid using a liquid ejection method, and is a recording method that generates little noise and can perform high-speed printing and multicolor printing.

Prints recorded using this inkjet recording method can be used, for example, for surface image observation using paper or so-called inkjet recording paper as the recording material, or by using a transparent recording material as the recording material. Slide and O
HP (overhead projector) and other optical devices are used to project images onto a screen for observation, color separation plates are used to create positive plates for color printing, and CMF is used for color displays such as liquid crystal displays. It can be used for various purposes such as color mosaic filters, etc.

On the other hand, when recording is performed on a recording material using the inkjet recording method, the image (original image) to be recorded is generally divided into countless pixels (this pixel is one).

As described later, it is essentially different from the pixel referred to in the present invention)
The original image is reproduced on the recording material for each pixel, which is one unit of the divided original image.

However, when recording is performed using the 11-times recording method in such a recording method, sufficient image density cannot be recorded when forming a print for surface image observation as described above. Even if a clear recorded image can be obtained, when forming a print for transmission observation,
The density of the recorded image is not sufficient for transmission observation,
When an image recorded by inkjet recording is projected onto a screen or the like, an unclear image is often obtained.

This means that in prints for surface image observation, most of the light that enters and is reflected by the recording agent layer of the recording material after recording passes through the recording layer approximately 2 times during the incident and reflection. At this time, this transmitted light is sufficiently absorbed or reflected depending on the color of the recording agent component of the recording liquid. Therefore, sufficient recording density can be obtained. On the other hand, in the case of prints for transmission observation, most of the light incident on the recording agent layer of the recording material after recording passes through this recording agent layer only once; It is presumed that this is because the absorption of transmitted light corresponding to the color of the recording agent component of the recording liquid is insufficient to provide a sufficient optical recording density to the projected image.

One way to give sufficient image density to a recorded image is to increase the concentration of the recording agent component of the recording liquid.
A recording liquid with a high recording agent concentration has problems such as a lack of recording liquid stability, and has had to be specially adjusted in order to obtain good characteristics as a recording liquid. Therefore, the inventors focused on the relationship between ink dots formed by recording droplets attached to a recording material and pixel density, and by obtaining a high pixel density, they could achieve a recorded image density sufficient for transmission observation. We have discovered a recording method that can record printed matter.

An object of the present invention is to provide an inkjet recording system capable of obtaining a clear projected image with sufficient image density when an image recorded by an inkjet recording method is projected onto a transparent recording material by light. It is about providing law.

That is, the present invention provides a method for recording an image by forming recording liquid into droplets and attaching the droplets to a transparent recording material.
This is an ink sheet recording method characterized by recording by depositing two or more recording droplets of the same color per pixel.

The recording method of the present invention is a method of recording on a light-transmitting recording material using a recording liquid, and is a recording method that can provide a sufficient image density to a projected image of a recorded image by light.

A pixel in the method of the present invention refers to one pixel when an image is recorded.
This refers to the minimum area divided by two colors, and a collection of pixels forms a recorded image. Therefore, the term "pixel" used in the present invention is different from the above-mentioned pixel, which is one unit of the divided original picture.

Generally, in order to provide sufficient image density to an image recorded by the inkjet recording method, it is necessary to obtain sufficient pixel density. Basically, pixel density can be increased by making the density of the recorded ink dots sufficiently high, and these requirements can also be met by recording the ink dots so that they occupy as wide an area as possible within the pixel. In consideration, in order to obtain a high pixel density, in the recording method of the present invention, when a droplet of recording liquid is attached to a transparent recording material by the ink side recording method, 1 according to the above definition is applied. Recording is performed by depositing two or more recording droplets of the same color per pixel.

In the method of the present invention, the method of attaching the recording liquid to the recording material is the above-mentioned ink sieve recording method, and more specifically, the electrostatic attraction method by applying a high voltage, and the method of attaching the recording liquid to the recording material using a piezoelectric element. Various recording liquid ejection methods are used, including methods that apply mechanical vibration or displacement, and methods that use the pressure of heating and foaming the recording liquid, to make the recording liquid fly as small droplets and adhere to the transparent recording material. to form ink dots.

As the recording liquid used in the recording method of the present invention, any recording liquid that can be used for inkjet recording can be used.

Further, the recording material used in the method of the present invention is
Shy＄don Le woman 1 奔 Kurageki light ox--starvation number 1 bias 9
It is possible to use a recording material, such as a plastic film having a polyamide resin coated with a water-soluble polymer or the like.

In the method of the present invention, two or more recording droplets of the same color are attached to one pixel. First, the first recording droplet is attached to all pixels to be recorded, and then the first recording droplet is A method is to apply a second recording droplet to all the pixels to which a recording droplet has been attached, and repeat this operation to deposit further recording droplets of the same color one after another. 2
A method of sequentially depositing the first recording droplet and the third recording droplet can be applied.

The recording of dots into pixels is controlled by signals sent in accordance with the image (original image) to be recorded.

In the recording method of the present invention, two
The recording droplets of the same color or more are recorded as one or more ink dots including two or more ink dots with at least a portion overlapping, or as a plurality of ink dots. In order to obtain higher pixel density without impairing the resolution of the recorded image, it is preferable that two or more ink dots be recorded with at least an overlapping portion.

In this state of ink dots, the image recorded by the recording method of the present invention satisfies at least one of the requirements necessary for obtaining high pixel density as described above, and is clear and has sufficient pixel density. It is an image.

In other words, when multiple ink dots of the same color are recorded in one pixel overlappingly or with overlapping parts,
Naturally, more recording agent components of the recording liquid are adhered to the overlapping portion of the ink dots than when they do not overlap, so that the density of the ink dots becomes higher and the recording density of one pixel as a whole also becomes higher. Furthermore, even when multiple ink dots of the same color are recorded in one pixel with deviations, the area occupied by those ink dots within the pixel becomes wider, so the amount of light that passes through the recording agent layer of the recording material decreases. As a result, the amount of light absorbed increases depending on the color of the recording material component, and the pixel density becomes sufficiently high.

According to the inkjet recording method of the present invention using the translucent recording material as described above, when an image recorded on the translucent recording material is projected with light, a clear image with sufficient image density is produced. A projected image can be obtained, and a print that can be suitably used for transmission observation can be recorded.

Hereinafter, the recording method of the present invention will be explained in more detail according to Examples.

Example Inkjet color printer (product name, A-121
O, made by Canon Co., Ltd.), thickness 100JII
The dry layer thickness after coating on the polyester film of I is 204
A test pattern (black, yellow, magenta,
Each cyan is printed in this order in four 2cm squares arranged horizontally on the recording material) and a pie chart (yellow, magenta, cyan, red, green, each color is divided into yellow sections in this order) In order of surplus, Japan, America,
The country names of Germany, Ikiris, and France are printed on it.
Furthermore, we created a pie chart with the title "Pie Chart J" printed below this pie chart.The method of printing twice so that the dots of the same color overlap in the same place is as follows.
For recording liquids of the same color, a method is used in which dots are recorded by first depositing a first recording droplet on all of the predetermined pixels, and then dots made by a second recording droplet are recorded by overlapping the previous dots. Yes.

The recording state of the recorded test pattern and pie chart was evaluated by the following method, and the results are shown in Table 1.

The transmitted optical density of the recorded image was measured using a photographic densitometer (NLM) for each color printed portion of the test pattern.
-3T low Tr, manufactured by Narumi Shokai).

Furthermore, a panel test was conducted to evaluate the projected images. In this panel test, images were projected onto a screen using a projector as described in Section 2, and 10 panelists judged the visibility of the projected images. In the panel test evaluation, when visually observing the projected image, those who judged that the entire projected image was clear, the colors of each color were good, and the country names and titles displayed in black were clear and easy to read. When O was 8 Å or more, the case where O was 57 Å or less was marked as ×.

Furthermore, in the same manner as above, the dots of the same color were printed three times (strike three times) so that they overlapped at the same location, and the same test pattern and pie chart as above were recorded. The recorded test pattern and the recording state of the pie chart were evaluated according to the method described above. The results are shown in Table 1.

Comparative Example: For a single color ink dot within a given pixel, only one
A test pattern and a pie chart were recorded in the same manner as in the example except that printing was performed only once (printed once). The result of evaluating the obtained recorded image according to the method of the example is shown in the table.

Claims (1)

[Claims] A method of recording an image by forming recording liquid into droplets and adhering them to a transparent recording material, characterized in that recording is performed by attaching two or more recording droplets of the same color per pixel. Inkjet recording method.