JPS63309477A - Recording head for image recorder - Google Patents

Abstract

PURPOSE:To set the quantities of light of three color beams emitted from LED light sources to desired values and enhance color balance, by composing each of three kinds of LED light sources of at least one LED chip, and making different the numbers of the LED chips constituting the light sources according to the spectral sensitivity of a recording material. CONSTITUTION:Three color light sources 158, which respectively radiate IR (infrared), R (red) and Y (yellow) color beams, differ in the number of LED chips 166. Namely, the IR light source 158C comprises one LED chip 166, whereas the R light source 158M comprises two LED chips 166, and the Y light source 158Y comprises four LED chips 166. With this arrangement, the quantities of light of beams radiated from the light sources are set to predetermined values according to the spectral sensitivity of a photosensitive material.

Description

Detailed Description of the Invention [Industrial Application Field] Unreleased 11 is a recording for an image recording device that records a color image on a recording material by scanning beams emitted from three color light sources based on one image information. Regarding the head.

[Prior Art] Currently, for example, in an image recording apparatus of the type in which an image is recorded by a recording head by rotating a recording material wrapped around the outer periphery of a recording drum, the recording drum is rotated while the recording material is wrapped around the recording drum. Main scanning is performed by rotating the recording head, and sub-scanning is performed by moving the recording head in the axial direction of the recording tram.

In this case, the three color lights E (attached to the recording head) are installed side by side in the -L scanning direction, and each light source irradiates the recording material with a beam with a slight phase difference. ing.

This light source is composed of an LED chip, and the LED
The light emitted by the chip is focused by a lens and irradiated onto the recording material with a predetermined beam diameter L (FIG. 6).

[Problem to be solved by the invention] However, since LED chips generally have different emission intensities depending on their emission wavelengths, and recording materials also have different sensitivities depending on wavelengths, three-color LED light sources are used to achieve a predetermined beam diameter. It was difficult to record high-quality images with good color balance.

The present invention takes the above considerations into consideration and provides a recording head for an image recording device that can adjust the color balance by adjusting the beam intensity of three-color LEDs to desired values in accordance with the spectral sensitivity of the recording material. That's one thing.

[Means for Solving the Problems] A recording head for an image recording apparatus according to the present invention is provided with three types of LED light sources that emit different wavelengths, and a light beam emitted from the light sources is adjusted based on image information. A recording head for an image recording device that records a color image on a recording material by scanning a color image, wherein each of the three types of LEDX and fIX is composed of at least one LED chip, and the spectral sensitivity of the recording material is In addition, it is characterized in that the number of the LED chips is different.

[Function] According to the present invention, the LED is adjusted according to the spectral sensitivity of the recording material.
The number of chips is different for each color. As a result, the three-color beam light can be adjusted according to the spectral sensitivity of the recording material.
Adjust the color balance to the desired value.

[Embodiments] Hereinafter, an image recording apparatus according to an embodiment of the present invention will be described.

FIG. 2 shows a schematic diagram of an image recording apparatus according to an embodiment of the present invention. In the image recording apparatus 10, a roll-shaped photothermographic material 16 is housed as a recording material in a magazine 14 housed in a machine stand 12. The photosensitive material 16 is pulled out from its outer periphery, cut into a predetermined length by a cutter 18, and then wound around the outer periphery of a rotating drum 20 serving as a recording drum. An exposure rack 22 for image recording is arranged corresponding to the outer periphery of the rotating drum 20, and the rotating tram 20 is rotated in the direction of arrow A to expose an image onto the wound photosensitive material 16.

After exposure, the photosensitive material 16 is rotated in the reverse direction of the rotating drum 20.
It is peeled off from the rotating drum 20 by the scraper 24, and water is applied to it as a molten material for image formation in the water application section 26! After being processed, it is sent to a thermal development transfer section 28 whose interior is used as a heating section.

On the other hand, the uppermost layer of the plurality of image receiving materials 32 accommodated in the tray 30 is sent to the thermal development transfer section 28 .

In the thermal development transfer section 28, there are conveyance rollers 34, which are in close contact with each other.
36, a photosensitive material 16 and an image receiving material 32 are provided in the population area.
After the paper is densely packed, it is sent to the conveyance rollers 3B and 40 at the exit section. A conveyance roller 42 is provided in the middle part.
44 are provided, and their role is to send out the photosensitive material 16 and image receiving material 32 that are in close contact with each other from the transport rollers 34, 36 to the transport rollers 38, 40. Each conveyance roller is configured to receive rotational force by being transmitted with the driving force of a motor (not shown).

Each conveyance roller is provided with a heater 46 on the opposite side of the conveyance path for the photosensitive material 16 and the image-receiving material 32, and is heated to a predetermined temperature by a heating element constituted by an energized heating element. .

A peeling means 48 is disposed in the @stream of the heat development transfer section 28, and the photosensitive material 16 sent out from the heat development transfer section 28 is
The image receiving material 32 is separated and sent to the waste photosensitive material storage box 5o and the image receiving material 32 to the drying device 52. After the image-receiving material 32 is dried in a drying device 52, it is delivered to a take-out tray 54L formed at the top of the machine stand 12.

As shown in FIG. 1, the rotary tram 2o has a hollow cylindrical shape, and one shaft 88 protrudes from the end.
receives the rotational force of the motor 90 and performs main scanning rotation around the axis (in the direction of arrow B).

The rotation angle of this rotary tram 20 can be detected by a rotary encoder 92.

A vacuum pump 96 is connected to a shaft 95 protruding from the end face of the one-rotation tram 20, so that the inside of the one-rotation tram 20 can be brought to negative pressure. This negative pressure is detected by a vacuum sensor 98.

Further, a large number of small holes 100 are bored in the outer circumferential surface of the rotating drum 20, so that the photosensitive material 16 can be suctioned and wound around the outer circumference of the rotating tram 20 by internal negative pressure.

Further, the 'A optical head 22 is guided by a guide bar 148 disposed in a parallel shaft state with the rotating drum, and the rotating tram 20
It is possible to move to Mo row. This exposure head 20 is connected to a wire 15 that is passed through a pair of pulleys 150 and 152.
4 ends are connected, and the pulley 150 or motor 15
By rotating under the driving force of 6, sub-scanning (arrow C
direction). During this sub-scanning movement, three light sources 158 (IR
(infrared) light source 158c, R (red) light source 158M, and Y (yellow) light source 1say) each emit light to expose a two-dimensional image onto the photosensitive material 16 wound around the outer circumference of the rotating drum 20. ing. In addition, IRXS source 1
Reference numeral 58c is for coloring the photosensitive material cyan, magenta with the R light source 158M, and yellow with the Y light source 158Y.

FIG. 3 shows the internal structure of the light source 158. The light source 15B has a main body composed of a cylindrical holder 160 and a stem 162, and has a condenser lens 1 at one end in the axial direction.
64 are arranged. An LED chip 166 is attached to the stem 162 via an insulating ceramic 163. One electrode of the LED chip (positive side electrode)
end 7-16 attached to insulating ceramic 163
5 and electrical wire 167, and this terminal 16
5 passes through the stem 162 and its tip is exposed to the outside (left side of the stem 162 in FIG. 3). Also, LED
The other electrode (minus side electrode) of the tip 166 is directly connected to a small diameter bar terminal 167 and is exposed through the stem 162.

By supplying power (not shown) to the terminal 165 and the bar terminal 167, the LED chip 166 emits light, and the light beam passes through the condenser lens 164 to become a beam of light, which is irradiated onto the photosensitive material 16. It is.

By the way, the three color light sources 158 are IR (infrared),
Although each color beam of R (red) and Y (yellow) is irradiated, the number of LED chips 166 is different from each other, as shown in FIG. That is, I
The R light source 158c has one LED chip 166 (see Fig. 4).
A)), R, i1Q158M LED chip 166 is 2
(Figure 4 (B)), Y light source 158Y LED chip 1
66 is composed of four pieces (FIG. 4(C)).

This is to adjust the beam light emitted from each light source, +1, to a predetermined value of 1 in accordance with the spectral sensitivity of the photosensitive material. With this configuration, as shown in FIG. In the present case, the beam charges of the three color light sources are almost the same. Furthermore, the beam diameter M of the yellow light source 158Y is larger than the beam diameters of the other light sources (infrared and red beam diameter L=178 gm, yellow beam diameter M=240 JLm).

This is because the yellow LED uses four chips, and in this case, if you want to obtain the same beam diameter as the infrared LED (which uses one chip), you should use a condensing lens with a short focal length. There is a need to use it, and it becomes difficult to select lens glue. By the way, the visibility of yellow is not as good for humans as compared to other colors, so even if the diameter of the beam is increased, there is no problem in practical use. Therefore, the diameter of the yellow beam is increased to facilitate selection of the condenser lens.

The operation of this embodiment will be explained below.

Since the photosensitive material 16 drawn out from the magazine 14 is under negative pressure inside the rotary drum 420 by the operation of the vacuum pump 96, it is attracted by the suction force of the small hole 100.

When the tip of the photosensitive material 16 comes into contact with a predetermined position on the rotating tram 20, the photosensitive material 16 is cut by the cutter 18. The photosensitive material 16 cut by the cutter 18 is wound around the outer periphery of the rotary drum 20 by rotation of the rotary drum 20 by a motor 90. When the photosensitive material 16 is wound around the rotating tram 20, the rotating drum 20 rotates at high speed, and an image is exposed by a three-color light source 158 attached to the exposure head 22 (main scanning). That is, the LED chip 166
The light rays emitted from the photosensitive material 16 are condensed by passing through a condensing lens, and are irradiated onto the photosensitive material 16 as a beam of light. In this case, the three color light sources 158 are linearly arranged in parallel at predetermined intervals along the rotation direction of the rotary tram 20;
The phase of the exposure information of each color is set at the predetermined intervals and the rotating drum 2.
Since the shift is based on the rotation speed of 0, the exposure process can be performed reliably without shifting the three colors. Further, the exposure head 22 is moved step by step in the direction of arrow C in FIG. 1 by the driving force of the motor 156 for each raw scan (sub-scan). By collapsing this, an image is exposed onto the photosensitive material 16.

After exposure, the photosensitive material 16 is peeled off by a scraper 24, coated with water by a water coating section 26, and sent to a thermal development transfer section 28.

On the other hand, the image-receiving material 32 in the tray 30 is sent from its uppermost position to the thermal development transfer section 28 and brought into close contact with the photosensitive material 16.

The photosensitive material 16 and the image-receiving material 32 after being brought into close contact with each other are sent to the transport rollers 42.44 through the transport rollers 34.36. Further, the paper is sent out from between the transport rollers 42 and 40 through the transport rollers 3B and 40. In this way, since the plurality of pairs of conveyance rollers are heated by the heater 46,
The photosensitive material 16 and the image receiving material 32 are immediately brought to a predetermined temperature, and the image recorded on the photosensitive material 16 is thermally developed and thermally transferred to the image receiving material 32.

After the transfer, the photosensitive material 16 and the image-receiving material 32 are separated by a peeling means 48, and the photo-sensitive material 16 is transferred to a waste 4i photo-sensitive material storage box 50, and the image-receiving material 32 is transferred by a reversing roller 56 in a substantially perpendicular direction (upward in FIG. 2). It is inverted and taken out to a takeout tray 54 via a drying device 52.

Here, the beam light intensity of the three color light sources applied to this embodiment is the II of the LED chip 166 constituting each light source.
As shown in the profile in Figure 5, due to the difference in amount,
It is almost uniform. That is, the red light source 158M is
Light -1 from the light emitting part of the ED chip 166 is the infrared light source 158c.
1.8 times compared to yellow light [158Y is LED
The light intensity of the light emitting part of the chip 166 is 3.2 times that of infrared light @1158c, which improves the visibility of yellow and magenta, which are relatively difficult to see, and improves the color balance of the three colors. , and the black tightness is improved. In addition, the beam diameter M of the yellow light source 158Y is made larger than the other beam diameters (240 gm) to reduce the conspicuousness of color shifts at the edges caused by misalignment of the optical axes of the infrared and nose beams. I was able to do it.

In this example, infrared, red, and yellow were used as the three-color light source in accordance with the spectral sensitivity of the photothermographic material, or R(
The three primary colors of red), G (green), and B (blue) may be used.

[9. Effect of brightness] As explained above, the recording head for an image recording device according to the present invention sets the beam lights H and H- of the three colors of LED to desired values according to the spectral sensitivity of the recording material, and achieves color balance. It has the excellent effect of being able to direct the

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a recording head for an image recording device of the present invention and related parts thereof, FIG. 2 is a schematic configuration diagram of an image recording device showing a positional embodiment of the present invention, and FIG. 3 is an interior of a light source. 4(A) to 4(C) are f-plane views of the infrared, red, and yellow stems, FIG. 5 is the beam diameter profile of this embodiment, and FIG. 6 is the conventional one. This is the beam diameter profile of . 1O... Image recording device, 16... Photosensitive material, 158... Light source. 166...LED chip.

Claims (1)

[Claims] (1) A recording head for an image recording device, which is equipped with three types of LED light sources emitting different wavelengths and records a color image on a recording material by scanning a light beam emitted from the light sources based on image information. For an image recording apparatus, wherein each of the three types of LED light sources is composed of at least one LED chip, and the number of the LED chips is varied according to the spectral sensitivity of the recording material. Go to record.