JPS63220658A - Image recorder - Google Patents

Abstract

PURPOSE:To correctly detect the color density of an image with a compact constitution by making a color density detecting head a pyramid structure capable of detecting the reflecting light of the same place with plural photosensors by one light source. CONSTITUTION:A color density detecting head 500 is equipped with one light source 502 to illuminate the image surface of a stabilized image receiving paper C in a casing 600 and at least three (red, green and blue) photosensors 504 to receive the reflecting light from the image receiving paper C, and an ampli fier 400 is provided on the outer surface of the casing 600 close to respective photosensors 504. The casing 600 has an aperture 602, is equipped with a pyramid-shaped wall part 601 protruded at the image receiving paper C side and the part 601 comes to be a double layer wall structure composed of an inner wall 601a and an outer wall 601b. Since the detection is executed by the reflecting light from the same place illuminated by one light source 502, a very accurate detection can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image recording device that has a function of detecting the color density of an image and is capable of color density correction. The present invention relates to an image recording apparatus having a detection head capable of detecting color separation.

[Technical background of the invention and its problems]

It is disclosed in Japanese Patent Application No. 117089/1989 as a photosensitive material for recording color images. This recording material TIT is a photosensitive and pressure sensitive thermal development material, and includes at least a photosensitive halogenated steel, a reducing agent, a polymerizable compound, and a color image forming substance coated on a support. and the color imaging material are comprised of photosensitive compositions encapsulated in the same microcapsules.

Regarding an image recording device that records an image using this photosensitive pressure-sensitive heat development material, a patent application filed in 1986 by the present applicant is disclosed.
-287492.

In such a device, accurately adjusting the color density of the image is a problem that can be said to be the life of the device, and there are many ways to make this possible. .

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and has a compact configuration that makes it possible to accurately detect the color density of an image. Aiming to provide an image recording device that can accurately perform color correction 1. [Means for solving the problems] Configuration of an image recording device according to the present invention to achieve the above-mentioned object The above feature is that in an image recording apparatus that has a detection head for detecting the color density of an image and is configured to perform color correction based on a detection signal of the detection head, the detection head includes: , comprising a casing having an opening at its tip and a pyramidal wall, a light source and a plurality of photosensors provided within the casing, the photosensors being shielded from direct light from the light source,
The configuration is provided on the pyramidal wall portion so as to detect light reflected from the original image by the light source that enters through the aperture.

The recording material that can be used in the image recording apparatus of the present invention may be any color photosensitive material.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The image recording device of the embodiment, as shown in the cross section in FIG. A moving lens type imaging optical system 200 is arranged.That is, the imaging optical system 200 includes an illumination lamp 208 that integrally scans the entire surface of the glass plate 2 below, a Mi7-21.0, and an imaging lens. A filter unit assembly 216, a mirror 212.214 that moves in the same direction depending on the scanning distance of the illumination lamp 208, etc., and a fixed mirror 218.2.
Consists of 20.222.

In the housing 1, a portion including the imaging optical system 200 is separated from other portions by a partition 1j, 7224.
The imaging optical system 20 reflected by the fixed mirror 222 (
1 light! There is an opening in the part where 1l1226 passes through
228 is not provided, but a shutter device 240 and a shutter control device 241 are arranged in the 1() direction 1228.

In the filter unit 300 of the assembly 216, as shown in FIG. 2, a plurality of cyan filters 302, magenta filters 304, yellow filters 306, and ND filters 308 having different transmittances are supported by solenoids 310, respectively.

The solenoid 310 is a linear solenoid that linearly moves a predetermined filter to insert and remove it onto the optical axis 226, or a linear solenoid that moves a predetermined filter in a circular arc having a center outside the optical axis 226 and inserts and removes the predetermined filter onto and from the optical axis 226. When the solenoid 310 is driven, a predetermined one of the filters 302, 304, and 306 is aligned with the optical axis 22.
6 is inserted.

A photosensitive material cartridge 14 containing a photosensitive material roll 12 wound with a photosensitive material S is removably attached to the side of the housing 1. At the outlet 16 of the photosensitive material S of the photosensitive material cartridge 14, a pair of photosensitive material cutout rolls 22 and 22 housed in the magazine connection dark box 20 are arranged.
As a result, the photosensitive material S wound around the photosensitive material roll 12 is rolled out by a predetermined length at a predetermined time.

When the leading end of the photosensitive material S advances when the cartridge 14 is set, the photosensitive material drawing rolls 22, 22 move away from each other as shown by the imaginary line 1 to facilitate the advancement of the photosensitive material S. . The front of the magazine connection dark box 20 (
A cutter unit 23 for cutting the photosensitive material S and a guide plate 24 are disposed at the front (hereinafter, the front refers to the downstream side in the direction of travel of the photosensitive material, etc.).

In front of the guide plate 24, an exposed photosensitive material support roll 26 and two photosensitive material nip rolls 28, 30 pressed against the exposed photosensitive material support roll 26 are arranged. The photosensitive material S guided by the guide plate 24 is brought into close contact with the exposed photosensitive material support roll 26 by the photosensitive material nip rolls 28.30.
Imagewise illumination of the document is performed by the imaging optical system 200 at a position 32 between 300 and 300.

A heat developing device 40 that heats and develops the exposed photosensitive material S is arranged in front of the exposed photosensitive material support roll 26 . The heat developing device 40 includes a developing housing 42 having a heat insulating effect, and is disposed within the developing housing 42, and has a diameter of about 120 mm.
An endless belt 50 is supported by a heating roll 44 heated to 0.degree. The nip roll 52 is pressed against the nip roll 52.

The heat developing device 40 further includes an exposed light-sensitive material support roll 26.
A guide device 54 that guides the photosensitive material S fed from the heating roll 44 onto the heating roll 44 and separates the photosensitive material S from the heating roll 44 after being heated and developed; It has a vertical guide device 58 for guiding the material to the exit 56, and the exit 56 is provided with a sensor 60 for detecting the tip of the sensitive material.

Directly below the outlet 56, a pair of pressure rolls 62, 64,
A photosensitive material receiving paper stacking device consisting of a nip roll 66 pressed against a pressure roll 64, and a guide member 68 that guides the photosensitive material S sent by the pressure roll 64 and the nip roll 66 to the contact portion of the pressure rolls 62 and 64. 70 are arranged.

An image-receiving paper supply device 72 is disposed on the side of the photosensitive image-receiving paper stacking device 70 . The image-receiving paper supply device 72 includes an image-receiving paper supply cassette 74 that protrudes from the housing 1 and is detachably attached, an image-receiving paper take-out roll 76 for feeding out the image-receiving paper C in the cassette 74, and a feed-out roll 76. The output image-receiving paper C is pressed into contact with the roll 64.
and a guide plate 78 that guides the nip roll 660 to the contact portion. 1. The width of the image-receiving paper C is, for example, about 6 mm smaller than the width of the photosensitive material S, and the image-receiving paper C is stacked in the photosensitive material S at the center of the photosensitive material S in the width direction in the photosensitive image-receiving paper stacking device 70. be done.

A pair of pressure nip rolls 80.82 and a pressure nip roll 80.8 are provided below the photosensitive image receiving paper stacking device 70.
A transfer device 88 is provided, which includes backup rolls 84 and 86 for equalizing the pressure of the two in the axial direction. Pressure nip roll 80.82 is approximately 500Kg/
The photosensitive material S and the image receiving paper C are pressed together by the pressure d.

A photoreceptor paper peeling device 90 is provided below the transfer device 88 . The sensitive image receiving paper peeling device 90 includes a guide member 92, a first feed roll 94, a second feed roll 96, and a first
A peeling belt 102 is wound around guide rolls 98 and 100 so as to press only the photosensitive material S at both outer end portions of the feed roll 94.

A sensitive material disposal section 104 is provided on one side of the peeling device 90, and a fixing device 106 is provided on the other side. The photosensitive material disposal section 104 includes a guide member 108, a pair of feed rolls 110 and 112, and a disposal index 114.
The photosensitive material S that has been jxed from the peeling device 90 and guided by the guide member 108 is put into the waste box 114 by the feed rolls 110 and 112.

The fixing device fft1.06 consists of a guide member 1.20, an ultraviolet irradiation lamp 124 with a reflective member 122, and a pair of feed rolls 126, 128, and is fed from the peeling device 90 and guided by the guide member 120. receiving paper C
A fixing process is performed on the image.

In front of the fixing device 106 is a fixed image receiving paper C being conveyed.
A color density detection head 500 for detecting the color density of an image is disposed, and a take-out tray 130 for receiving the image receiving paper C is attached to protrude from the housing 1.

As shown in FIGS. 3 and 4, the color density detection head 500 includes a light source 502, such as a halogen lamp, which illuminates the image surface of a fixed image-receiving paper C (material to be measured) in a casing 600. At least three (red, green, blue) photosensors 504 that receive reflected light from the image receiving paper C due to illumination from a light source are provided, and an amplifier 400 is provided on the outer surface of the casing 600 in proximity to each photosensor 504. ing. As is clear from the figure, the casing 600 has a pyramidal wall portion 60 having an opening 602 and protruding toward the receiving paper C side.
1 (in this case, a four-sided pyramid), and this pyramid-shaped wall portion 601
has a double wall structure consisting of an inner wall 601a and an outer wall 601b, and each photo sensor 504 is placed between the inner and outer walls.
are provided separately on the inclined surface forming a four-sided pyramid, and the image receiving paper C
It is configured to appropriately detect reflected light from the

Each of the photosensors 504 can be configured by a combination of, for example, a silicon single crystal photodiode, an amorphous silicon diode, etc., and each filter that transmits only a specific wavelength. It is desirable that the inclination angle (θ) is approximately 45°.

The apparatus further includes a color density control unit 150 connected to the imaging lens/filter unit assembly 216 and the photosensor 504 and disposed at a suitable location within the housing 1.
, a color density control unit 150, and a shutter control device 24.
1. A system control device that is connected to the drive system (not shown) of the imaging optical system 200, the cutter unit 23, the sensitive material leading edge detection unit 60, and the sensitive material image receiving paper stacking device 70, and controls the entire device. (not shown).

As shown in the block diagram of FIG. 5, the color density control unit 1-150 includes a photosensor 504 that separately receives red, green, and blue light. (R), 504 (G), 504 (
B) respectively amplifier 400 and A,/D converter 4
02 to the input side of the control circuit 4-04, and the output side of the control circuit 404 is connected to the solenoid 310 via the solenoid drive circuit 406. Here 1 control circuit 40
Step 4 memorizes standard levels for red, green, and blue in advance, and compares these with the outputs of the photosensors 504 (R), 504 (G), and 504 (B) by copying a test chart to determine the color shift of the device. Detect amount. Control circuit 40
4 further performs calculations based on this amount of color shift or searches a standard table showing combinations of color shift amounts and correction filters to form a solenoid control signal and send it to the solenoid 1 drive circuit 406. Output to.

The system control device controls the following operations during normal image recording. That is, in the operation stage, so-called copy preparation stage, the leading end of the photosensitive material S is placed near the cutting part of the cutter unit 23 or inside the magazine connection dark box 20. Subsequently, when a copy start button (not shown) is pressed, the photosensitive material take-out roll 22 is actuated to feed the photosensitive material S until its leading end reaches position 32.

After that, the illumination lamp 208 is turned on, and the imaging optical system 208
performs a predetermined scan, and the previously closed shutter device 240 is opened to expose the photosensitive material S. On the other hand, when the photosensitive material S is fed a distance equal to the length of the document in the moving direction, the cutter unit 23 is activated.
Cut the photosensitive material S.

The cut and exposed photosensitive material S is sent to a heat developing device 40, and is pressed against a heating roll 44 by an endless belt 50 to a temperature of about 120°C. l' is heated and developed. The photosensitive material tip detection sensor 60 detects that the leading edge of the fully developed photosensitive material S has passed through the outlet 56.In addition, in the image receiving paper supply device 72, pressing the copy start button or starting exposure is activated. The image receiving paper C is taken out in synchronization with the timing, and its leading end touches the pressure roll 6.
The image receiving paper C is fed to a position where it is nipped by the nip roll 66 and the image receiving paper C is stopped.

In the photosensitive image receiving paper stacking device 70, the small and medium image receiving paper C is located at the center of the wider photosensitive material S in the width direction, and the leading edge of the photosensitive material S is aligned with the leading edge of the image receiving paper C. Alternatively, they are superposed one on top of the other by several millimeters in advance, are sent to the transfer device 88, are compressed by a pressure cuff of approximately 50011/crl, and are transferred onto the image receiving paper C.

The photosensitive material S after transfer is peeled off from the image receiving paper C by a peeling belt 102 in a peeling device 90 and sent to a photosensitive material disposal section 104.
sent to. On the other hand, the image receiving paper C is sent to the fixing device 106, where it is irradiated with ultraviolet light for about 5 seconds to be fixed.
Then the feed rolls 126 and 128 take out the tray 1.
Sent to 30. At this time, it goes without saying that the color density detection head 500 does not operate at all.

On the other hand, when a lot change of the photosensitive material S is made and it is desired to adjust the color density, first, a test chart for adjusting the density of one color is placed on the glass plate 2 facing downward. Next, a color density adjustment button (not shown) is pressed to perform the above-described normal image recording operation, and the fixed image receiving paper C, that is, the test chart copy is passed over the color density detection head 500. The color density detection head 500 has a light source 502 turned on to illuminate the test chart copy, and photosensors 504 (R), 5
04(G) and 504(B) detect the color density of the test chart 2-, respectively. This detection is performed using one light source 50
2, and the light detected by each photosensor 504 is detected by the specularly reflected light that is blocked by the slope of the pyramidal wall 601. This allows extremely accurate detection. It is possible to do the following. moreover,
Each photosensor 504 is almost integrally provided with an amplifier 400 that amplifies the signal detected by this photosensor 504. Color density control unit (color density control unit) as a stable and accurate signal that is immediately amplified without going through any system etc.
150 can be sent.

Based on the signal from the color density detection head 500, the color density control unit 150 inserts and removes the filter onto the optical axis 226, and the filters 302, 304, 306, 30
8 is placed on the optical axis 226, and color density adjustment is performed. Thereafter, the normal image recording operation described above is performed based on the desired color density.

In the above embodiment, the pyramid-shaped wall portion 601 of the casing 600 is made of a four-sided pyramid, and the photosensors 504 are provided on three of the inclined surfaces, but the visible light component detection is provided on the remaining one inclined surface. By installing a sensor for
For example, the amount of light may be detected, and the shape of the pyramid is not limited to a four-sided pyramid, but may also be a three-sided pyramid or a triangular pyramid f without any problem.

Furthermore, in the above embodiments, an image recording apparatus is shown in which a photosensitive pressure sensitive heat developing material is used which obtains an image by pressure transfer to an image receiving layer provided on an image receiving material. When a heat-developable material is used, the structure of the image recording apparatus is such that the image-receiving material supply device and the photosensitive material waste tray are omitted.

〔Effect of the invention〕

According to the present invention, the color density detection head has a pyramidal structure in which a plurality of photosensors can detect reflected light from the same location using one light source, so the detection head can be made smaller, and the color density detection head can be made smaller. It is possible to obtain the signals necessary for adjustment extremely accurately and stably, and it is possible to eliminate changes in color density of image recording caused by changes in the light source used over time, differences in lots of thermal development materials, etc. An image recording device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a structural explanatory diagram of an image recording device according to an embodiment of the present invention;
2 is an explanatory diagram of the filter unit 300, FIG. 3 is a perspective view showing one embodiment of the color density detection head according to the present invention, and FIG. 4 is a sectional view taken along line A-A in FIG. 3. FIG. 5 is a block diagram of the color density control unit. S: Photosensitive material, C: Receiving paper, 1: Housing, 12: Bad phase roll, 40: Heat developing device,
70...Sensitive material image receiving paper overlapping device, 88...Transfer device, 90...Sensitive material image receiving paper peeling device, 106...Fixing device, 150...Color density control unit, 216...
・Imaging lens/filter unit assembly, 300・
... Filter unit l-, 310 ... Solenoid,
400...Amplifier, 500...Color density detection head,
502...Light source, SO4...F first sensor, 60
0...Casing, 601...Pyramidal wall portion, 601
a...Inner wall, 601b...Outer wall, 602...Opening. Figure 3 Figure 4

Claims (1)

[Claims] 1) having a detection head for detecting the color density of an image;
In an image recording device configured to perform color correction based on a detection signal of the detection head, the detection head includes a casing having an opening at its tip and a pyramid-shaped wall, and a casing provided within the casing. the pyramid-shaped light source and a plurality of photosensors, the photosensors are shielded from direct light from the light source and detect light reflected from the original image by the light source incident through the aperture. An image recording device characterized in that it is installed on a wall. 2) The pyramid-shaped wall portion of the casing is a triangular pyramid and has a double wall structure consisting of an inner wall and an outer wall, and the photosensors are provided on three inclined surfaces between the inner and outer walls, respectively. The image recording device according to claim 1, characterized in that the image recording device is a different color separation sensor. 3) The pyramid-shaped wall portion of the casing is a four-sided pyramid and has a double-walled structure consisting of an inner wall and an outer wall, and the photosensor is arranged to correspond to each of the four inclined surfaces between the inner and outer walls. The image recording device according to claim 1, further comprising sensors for detecting red, green, blue, and white light. 4) An amplifier that amplifies the detection signal of the photosensor,
The image recording device according to claim 2 or 3, wherein the image recording device is provided on the outer surface of the pyramidal wall portion so as to be close to the photosensor.