JPH03282543A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain the image of stable quality without receiving the effect of an internal temperature by adjusting an image forming condition according to the change of the internal temperature of an image forming device. CONSTITUTION:The temperature of a pressure developing device is measured by a temperature sensor circuit 22d, and the insertion quantity of optical filters 61-63, the light quantity of a halogen lamp 5a and the sub exposure of a sub exposing unit 80 corresponding to the measured temperature are read out from a memory 102, then the above means are respectively controlled based on the data. Namely, when the temperature of the pressure developing device rises, the insertion quantities of a yellow optical filter 61 and a cyan optical filter 63 in a filter 6 are decreased and the exposure of the lamp 5a is increased to correct the rise of the density of developed color caused by the temperature rise. Furthermore, by increasing the insertion quantities of the yellow filter and the cyan filter of the sub exposing unit 80 and decreasing the exposure of the halogan lamp in the unit 80, the increase of gradation caused by the temperature is corrected. At such a time, the controlled variable of the filter 6 is corrected because the sensitivity characteristic of a microcapsule paper is automatically inputted by a bar-code sensor 17a when the paper passes.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an image forming apparatus equipped with a pressure developing device, and more specifically, an image forming apparatus that detects the temperature of the pressure developing device and adjusts image forming conditions. The present invention relates to an image forming apparatus.

[Prior Art] A photosensitive and pressure sensitive recording medium having a surface coated with photocurable microcapsules containing a chromophoric dye is known, for example, as disclosed in US Pat. No. 439.
This is already known from the specification of No. 9209. This type of photosensitive and pressure sensitive recording medium, although not described in detail, is one that is exposed to light from a light source based on input image information and then crushes the uncured microcapsules to realize an image. Image forming apparatuses using this type of photosensitive and pressure sensitive recording media are already known, as they have the characteristic of producing good images similar to those produced by photography.

[Problems to be Solved by the Invention] However, in an image forming apparatus using this type of photosensitive and pressure sensitive recording medium, when the image forming apparatus is used for a long time, the internal temperature of the image forming apparatus increases due to internal heat generation. A problem occurred in that the image quality of the output image changed accordingly.

The present invention has been made to solve the above-mentioned problems, and by adjusting the image forming conditions in accordance with changes in the internal temperature of the image forming apparatus, it is possible to maintain stable image formation without being affected by the internal temperature. The present invention aims to provide an image forming apparatus that can produce high quality images.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the image forming apparatus of the present invention exposes a photosensitive recording medium to light having image information to form a latent image, and then uses a pressure developing device. In an image forming apparatus configured to form a color image by passing through the pressure developing device, a temperature detecting means for detecting the temperature of the pressure developing device or the temperature near the pressure developing device, and based on information from the temperature detecting device, and adjustment means for adjusting image forming conditions.

According to the image forming apparatus according to the second aspect, the adjusting means may be constituted by a hue adjusting means that adjusts the spectral characteristics of the light irradiated onto the photosensitive recording medium.

According to the image forming apparatus according to the third aspect, the adjusting means may further include a light amount adjusting means for adjusting the amount of light irradiated onto the photosensitive recording medium.

According to the image forming apparatus according to claim 4, the adjusting means may be constituted by a temperature adjusting means for adjusting the temperature near the exposure section that exposes the photosensitive recording medium with light having image information of the document. good.

Further, according to the image forming apparatus according to the fifth aspect, the adjustment means may be constituted by a pressing force adjusting means that adjusts the pressing force of the pressure developing device.

Furthermore, according to the image forming apparatus according to the sixth aspect, the adjusting means may be constituted by a pressure speed adjusting means for adjusting the speed at which the photosensitive recording medium passes through the pressure developing device.

[Function] The image forming apparatus of the present invention adjusts the image forming conditions by the adjusting means based on the information from the temperature detecting means for detecting the temperature of the pressure developing device or the temperature near the pressure developing device, thereby producing a color image. Adjust the color.

Further, in another image forming apparatus of the present invention, the photosensitive recording medium is irradiated by the hue adjusting means based on information from the temperature detecting means for detecting the temperature of the pressure developing device or the temperature near the pressure developing device. It adjusts the spectral characteristics of the light and further controls the amount of light according to the detected temperature.

Further, in another image forming apparatus of the present invention, light having image information of the original is controlled by a temperature adjusting means based on information from a temperature detecting means for detecting the temperature of the pressure developing device or the temperature in the vicinity of the pressure developing device. The temperature in the vicinity of the exposure area where the photosensitive recording medium is exposed is adjusted by.

Further, in another image forming apparatus of the present invention, the pressing force of the pressure developing device is adjusted by the pressing force adjusting means based on information from the temperature detecting means for detecting the temperature of the pressure developing device or the temperature in the vicinity of the pressure developing device. Adjust.

Further, in another image forming apparatus of the present invention, the pressure of the photosensitive recording medium is adjusted by the pressure speed adjustment means based on information from the temperature detection means for detecting the temperature of the pressure development device or the temperature in the vicinity of the pressure development device. Adjust the speed at which it passes through the developing device.

[Example] DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments embodying the present invention.

FIG. 1 shows a photosensitive pressure-sensitive copying machine as an image forming apparatus of the present invention.

In the photosensitive and pressure sensitive copying machine 1 of this embodiment, as shown in FIG.
A photosensitive paper consisting of a color developer paper 28 and a color developer paper 28 is used.

Note that the microcapsule paper 12 used in this example
The surface of the support is coated with microcapsules, and the microcapsules contain dye precursors and the like that react with the color developer described below. A color developer is coated on the surface of the support of the color developer paper 28 and develops color by reacting with a dye precursor.
It is described in the specification of No. 9209, etc., and will be omitted here.

At the top of the copying machine 1, there is a document table glass 2 and a document table cover 3.
A desired original 4 is placed on the original platen glass 2.
is placed face down and the document table cover 3 is closed.

A halogen lamp 5a and a reflector 5b are provided below the document table glass 2 in the upper part of the copying machine 1.

A light source unit 5 equipped with a reflecting mirror 8 and the like is disposed so as to be movable back and forth along a shaft 13 extending parallel to the document table glass 2. The light source section 5 irradiates light onto the document table glass 2 in a line in a direction perpendicular to the movement direction.

The irradiated light passes through the transparent document platen glass 2 and is reflected downward by the document 4 placed thereon.

A mirror portion 9 including reflective mirrors 9a and 9b is disposed below the document table glass 2 and is movable separately from the light source section 5, and the light reflected from the document 4 is reflected by the reflective mirror 8.
The light beams 9a and 9b are reflected in this order and guided in parallel to the moving direction of the light source section 5.

A projection lens 7, which is usually fixed, and a filter 6, which will be described later, are arranged below the document table glass 2 to adjust the color tone of the copied image, and the light reflected by the reflection mirror 9b passes through the projection lens. 7. The light projected by the lens 7 is reflected by reflection mirror groups 10a and 10b.

An exposure stage 11 for exposing the microcapsule paper 12 is disposed below the reflective mirror 10b, and a reflective mirror 10c for switching the optical path is disposed between the reflective mirror 10b and the exposure stage 11. There is. Image information of the document 4'' is formed on the microcapsule paper disposed along the exposure table 11. A sub-exposure unit 80, which will be described later, is disposed below the exposure table 11 to sub-expose the microcapsule paper 12 after main exposure.

Further, the reflecting mirrors 10a and 10b are normally fixed, but are set when enlarging or reducing the size of the latent image formed on the microcapsule paper 12, and change the optical path length according to a change in the projection magnification 13. Therefore, they are configured to be able to move together in the axial direction of the shaft 13.

On the other hand, a cartridge 15 is disposed in the center of the copying machine 1, and the elongated microcapsule paper 12 is housed in the cartridge 15, which is removable from the machine while being wound around a cartridge shaft 14. With the cartridge 15 set at a predetermined position within the machine, the leading end of the microcapsule paper 12 is pulled out toward the exposure table 11.

A feed roller 19 and a dancer roller 21 for tension adjustment are provided below the exposure table 11. On the right side of the dancer roller 21, a large diameter pressure roller 22a,
A pressure developing device 22 equipped with a small-diameter pressure roller 22b2 and a back-up roller 22c is disposed, and on the right side of the pressure developing device 22, the microcapsule paper 12 and the color developing paper 28, which are in close contact with each other, are separated, as will be described later. A separation roller 23 is provided for this purpose, and a winding shaft 24 for winding and holding the microcapsule paper 12 is provided between the separation roller 23 and the cartridge 15. Further, the pressure developing device 22 is provided with a temperature sensor 22d for detecting the temperature of the pressure developing device 22 or the temperature in the vicinity thereof. The microcapsule paper 12 that comes out of the upper part of the cartridge 15 is guided by a tension roller 19, passes above the exposure table 11, and then passes through a dancer roller 21.
, a pressure developing device 22 , and further guided to a separation roller 23 , and then wound onto a winding shaft 24 . Note that the unexposed microcapsule paper 12 after leaving the cartridge 15
is maintained in an unexposed state by a light-shielding cover. A paper feed cassette 29 containing developer paper 28 is installed below the pressure developing device 22 . A suction cup-type paper feeding mechanism 30 is disposed above the paper feeding cassette 29, and the developing paper 28 is taken out one by one by the paper feeding mechanism 30. Paper feeding mechanism 30 and pressure developing device 22
A feed guide 31d, feed rollers 31a, 3
1b and 31c are arranged, and the color developing paper 28 is conveyed by feed rollers 31a, 31b, 31c and a feed guide 31d and carried into the pressure developing device 22.

A heat fixing device 32 is disposed on the right side of the pressure developing device 22, and the heat fixing device 32 includes a heat roller 32a,
A conveyor belt 32c stretched between the paper ejection roller 32b, the heat roller 32a, and the paper ejection roller 32b is disposed, and to the right of the heat fixing device 32 is a color developer paper 2 on which an image has been formed.
A paper discharge tray 33 for storing paper sheets 8 is provided. Above the heat fixing device 32, a deodorizing filter 37 for removing the odor of gas generated during heat fixing and a deodorizing fan 38 for guiding the gas to the deodorizing filter 37 are provided.

Further, this copying machine has an autoloading function for automatically setting the microcapsule paper 12 on a predetermined transport path within the apparatus. This is a function that automatically pulls out the leader film part attached to the tip of the microcapsule paper 12 into the apparatus, transports it inside the apparatus, and winds it around the winding shaft 24. As a result, the microcapsule paper 12 following the leader film section is also wound up on the winding shaft 24, and the setting in the apparatus is completed.

For this automatic loading, a half-moon roller 17 is provided between the roller 19 and the cartridge 15 for pulling out the leader film section, and a separation chute 27 is rotatable for guiding it to the take-up shaft 24. installed. Around the winding shaft 24, a machining guide 25 and a machining guide 26 are arranged for winding the leader film.

Furthermore, the leader film section contains microcapsule paper 1.
A bar code representing sensitivity characteristics of 2 is provided. or,
A barcode sensor 17a is disposed between the cartridge 15 and the half-moon roller 17 to read the barcode on the leader film section. During autoloading, the barcode sensor 17a reads the barcode and displays the micro The sensitivity characteristics of the capsule paper 12 are automatically determined manually.

Next, the operation of this copying machine will be explained.

When the cartridge 15 is set in the copying machine 1, autoloading is started.

Half moon, roller 17 only when autoloading starts,
The leader film section 1 rotates once to several times in the conveyance direction.
8 to the roller 20. After that, it stops, and subsequent conveyance is performed by driving the rollers 20. At this time, the bar code on the leader film section is connected to the bar code sensor 17.
a, and the sensitivity characteristics of the microcapsule paper 12 are automatically input manually.

Makitori guide sea urchin 25. When the automatic loading is completed, the feeder guide 26 and the separation chute 27 are rotated to the position shown by the - dotted chain line, and the leader film section 18 attached to the tip of the microcapsule paper 12 is wound around the take-up tube 24. Makitori guide sea urchin 25. The machining guide seat 261 separation chute 27 returns to the position shown by the solid line and copying is possible.

When the copy start key is operated, the halogen lamp 5
The light amount of a, the filter 6, and the sub-exposure unit 80 are controlled as described below.

The above reflecting mirror 8. The light source section 5 is made of microcapsule paper 12
If the conveyance speed is ■ and the projection magnification is m, then the moving speed (1
/m) V, reflecting mirror 9a.

9b moves at a moving speed (1/2 m)V. Since the transport speed of the microcapsule paper 12 is synchronized with the moving speed of the mirror groups 8, 9a, and 9b as described above, the exposure stage 1
1, latent images of predetermined lines of the original 4 are sequentially formed on the microcapsule paper 12 as it passes through the microcapsule paper 12. Note that the predetermined speed ratio is predetermined based on the setting of the magnification.

The microcapsule paper 12 on which the latent image has been formed is transported,
The topmost color developing paper 28 of the paper feed cassette 29 is fed to the paper feed mechanism 30.
, conveyed by feed rollers 31a, 31b, 310, etc.

The pressure developing device 22 is supplied with the microcapsule paper 12 and the color developer paper 28 in close contact with each other, and the microcapsule surface on which the latent image of the microcapsule paper 12 is formed and the color developer of the color developer paper 28. With the application surface in contact with the inside, the sheet is sandwiched between the large-diameter pressure roller 22a and the small-diameter pressure roller 22b, and pressure is applied. This pressure destroys the unexposed microcapsule paper and forms an image on the developer paper 28.

The microcapsule paper 12 and the color developer paper 28 that have come out of the pressure developing device 22 are separated by a separation roller 23, and the color developer paper 28 is accelerated in color development by a heat fixing device 32 to form an image, and is then discharged. The paper output tray 33 is moved by the paper roller 32b.
will be carried out. In addition, the separated microcapsule paper 12
is wound onto the winding shaft 24 via the separation roller 23e.

Next, the configuration of the filter 6 will be explained in detail with reference to FIG.

The filter 6 as the hue adjustment means of the present invention has a total of three optical filters 61, 62 and 63 on their respective distal ends, which are capable of reciprocating in the direction intersecting the optical path, that is, in the horizontal direction in the drawing. Movable filter bodies 64 to 66 are arranged at predetermined intervals in the vertical direction. In this embodiment, the color of the upper optical filter 61 is yellow;
The color of the middle optical filter 62 is magenta, and the color of the lower optical filter 63 is cyan. The color tone of the light emitted from the radiation surface area 32 is changed by interposing each of the optical filters 61 to 63 singly or in combination in the optical path.

Each of the movable filter bodies 64 to 66 is supported so as to be able to reciprocate by a guide frame (not shown), and the position where each of the optical filters 61 to 63 completely opens the optical path, and It is possible to move back and forth between a position where the optical path is completely blocked. Moreover, a rack extending in the same direction as the filters 61 to 63 reciprocates is formed on the upper surface of the proximal end of each of the movable filter bodies 64 to 66, respectively.

Further, in order to reciprocate each movable filter 61 to 63, step motors 71, 72, and 73 are respectively disposed near each movable filter body 64 to 66, and are attached to the output shaft of each step motor 71 to 73. A mounted binion is drivingly connected to the rack of each movable filter body 64-66. Each of the step motors 71 to 73 is electrically connected to a filter control circuit 106, which will be described later, and is configured to rotate a predetermined amount based on a signal from the filter control circuit 103.

Therefore, by driving each of the step motors 71 to 73, each of the movable filter bodies 64 to 66 is reciprocated, and the optical filters 61 to 63 are interposed to block the optical path. Further, by adjusting the drive (2) of each step motor 71-73, the amount of movement of each movable filter body 64-66 is adjusted, and the shielding position by each optical filter 61-63 is adjusted.

Next, a configuration example and a control example of the sub-exposure unit 51 will be explained with reference to FIG.

FIG. 3 shows an example of its configuration. Main sub-exposure unit 8
0 is composed of a light emitting section 81, a filter section 83, and a diffusion plate 85. The light emitting unit 81 includes a halogen lamp 87 for a light source with a reflector, and a lamp control circuit 89 that controls lighting of the halogen lamp 87 and the amount of light thereof.

The filter section 83 includes an actuator 93 that accommodates a plurality of filters 91 having different hues and can insert one or more arbitrary filters between the halogen lamp 87 and the diffusion plate 85, and an actuator drive circuit 95 therefor. has been done.

The filter 91 has the same configuration as the filter 6 described above,
The color of the filter 91a is yellow, the color of the filter 91b is magenta, and the color of the filter 91c is cyan.

The diffusion plate 85 diffuses the colored light so that the colored light transmitted through the filter 91 is evenly irradiated onto the microcapsule paper 12.

The lamp control circuit 89 and the actuator drive circuit 95 operate based on instructions from the sub-exposure light source control circuit 97.

FIG. 4 shows a block diagram showing the electrical configuration of this embodiment.

The CPU 103 includes a barcode sensor 17a for reading the barcode on the leader film portion of the microcapsule paper 12, and a temperature sensor 22d for detecting the temperature of the pressure developing device 22 or the temperature in the vicinity thereof.
Start key to instruct copy start and each filter/
A key panel 109 is provided with control keys for manually adjusting the exposure amount, and various buttons are provided that correspond to the temperature of the pressure developing device 22 or the temperature in its vicinity, or the sensitivity characteristics of the microcapsule paper 12. A memory 102 that stores the amount of filter insertion and the exposure amount of each light source in a tabular form, a halogen lamp control circuit 104, a sub-exposure light source control circuit 108, and a filter control circuit 106 are connected. Furthermore, the halogen lamp control circuit 10
4 is connected to a halogen lamp 5a, and controls the exposure amount of the halogen lamp 5a. Further, the sub-exposure light source control circuit 108 is connected to the sub-exposure unit 80. A filter control circuit 106 is connected to the filters 6 and controls the amount of insertion of each filter.

The exposure control operation of this embodiment will be explained below.

First, the relationship between the color density of the microcapsule paper 12 and the temperature of the pressure developing device or the temperature near the pressure developing device will be described.The color density of the microcapsule paper 12 increases as the temperature increases. Furthermore, there are differences in the degree of increase in color density for each of the colors yellow, magenta, and cyan, and as the temperature increases, the color density increases particularly for yellow and cyan. Therefore, when the temperature is high, the amount of insertion of the yellow optical filter 61 and the cyan optical filter 63 in the filter 6 is reduced in order to maintain the color balance of each color.

In order to compensate for the increase in the overall color density, it is sufficient to increase the exposure amount of the halogen lamp 5a.

Furthermore, as the temperature rises, the gradation becomes softer, and the degree of change in gradation varies depending on each color: yellow, magenta, and cyan. As the temperature increases, the gradation of yellow and cyan increases the most, while magenta has the least effect. Therefore, when the temperature is high, in order to make the gradation of each color uniform, the amount of insertion of the yellow filter 91a and the cyan filter 91c in the sub-exposure unit 80 is increased to make the gradation of each color uniform. Further, the halogen lamp 8 of the sub-exposure unit 80
What is necessary is to reduce the exposure amount in step 7 and reduce the sub-exposure amount, which has the effect of producing gradation.

Next, the operation will be explained based on the flowchart shown in FIG. 5. In step 1 (hereinafter simply referred to as 81; the same applies to other steps), it is determined whether or not the start key has been pressed, and the process moves to S2. 6-(The temperature of the pressure developing device 22 or the temperature near the pressure developing device 22 is measured by the degree sensor 22d, and based on the measured temperature, each optical filter 61-- corresponding to the measured temperature is 6
3, the light amount of the halogen lamp 5a, and the sub-exposure amount of the sub-exposure unit 80 are read out from the memory 102 (
S2), each is controlled based on the data.

That is, the temperature of the pressure developing device 22 or the pressure developing device 2
If the temperature rises to around 2, the amount of insertion of the yellow optical filter 61 and the cyan optical filter 63 in the filter 6 is reduced as described above, and the halogen lamp 5a is
The increase in color density due to the rise in temperature is corrected by increasing the exposure amount. Furthermore, the yellow filter 91a and cyan filter 91c of the sub-exposure unit 80 are inserted.1. The amount of insertion is increased and the amount of exposure of the halogen lamp 87 in the sub-exposure unit 80 is decreased to correct the increase in gradation due to temperature, and the process moves to S4. At this time, barcode sensor 17
Since the sensitivity characteristics of the microcapsule paper 12 are automatically inputted at the time of paper feeding by a, the control amounts of the filter 6 and the like are corrected according to these sensitivity characteristics.

A copy operation is performed in S4, and this flow ends.

Next, a second embodiment will be described with reference to FIG. Incidentally, in the description, the same numbers are given to the parts that have the same functions and effects as those of the above-mentioned embodiments.

In the case of this embodiment, a heater 110 is provided on the back side of the exposure table 11 as a temperature adjusting means of the present invention. This heater 110 is energized and controlled by the CPtJ 103, and the CPU 103 controls the exposure stage 11 based on a signal from the temperature sensor 110a for detecting the temperature of the exposure stage 11.
The heater 110 is controlled so that the temperature of the heater 110 is constant.

In addition, in this embodiment, there is a mode changeover switch for switching between a photo mode that requires gradation and a document mode that does not.

In the structure as described above, when the copy start key is pressed, the microcapsule paper 12 is transported as the halogen lamp 5a moves.
This is similar to the previous embodiment.

In general, there is a relationship shown in FIG. 7 between the gamma characteristics of the microcapsule paper 12 and the temperatures of the exposure stage 11 and the pressure developing device 22.
D (density)mi, which indicates the ease of reproducing white
It has been found through experiments that there is a relationship shown in FIG. 8 between n (minimum) (the minimum density that can be output by this copying machine) and the temperatures of the exposure stage 11 and the pressure developing device 22. .

When the copy start key is pressed, CPUIO3
When the state of the mode changeover switch is determined (5IO), and the document mode is set, in S11, the temperature sensor 22d detects whether the temperature of the pressure developing device 22 or the temperature in the vicinity thereof is high. . Then, the CPU 103 controls the temperature of the pressure developing device 22;
Or, if the temperature in the vicinity is high, the exposure stage 11
is heated by the heater 110 (512), and if the temperature of the pressure developing device 22 or the temperature in the vicinity thereof is low, the heater 110 is not energized (S13). In this state, a copy operation is performed (S14). As a result, the gamma characteristics of the microcapsule paper 12 become high contrast, the contrast improves, and image quality suitable for documents is obtained.

At this time, if the temperature of the pressure developing device 22 or the temperature in the vicinity thereof is high and the exposure table 11 is high, Dmin will deteriorate somewhat, but it can be improved by increasing the light amount of the halogen lamp 5a.

Further, when the photo mode is set in S10, the temperature sensor 22d detects whether the temperature of the pressure saw developing device 22 or the temperature in the vicinity thereof is high in S15. Then, when the temperature of the pressure developing device 22 or the temperature in the vicinity thereof is high, the CPtJ 103 does not energize the heater 110 (S16). Further, when the temperature of the pressure developing device 22 or the temperature in the vicinity thereof is low, the exposure table 11 is heated by the heater 110 (517), and in this state, the copying operation is performed (517).
S14). As a result, the gamma characteristics of the microcapsule paper 12 become softer, the gradation becomes better, and an image quality suitable for photography can be obtained.

When the copying machine is used for a long time, the internal temperature rises due to internal heat generation, and the temperature of the pressure developing device 22 or the temperature in its vicinity changes. At this time, the CPU 103 detects the temperature sensor 22d. Since the temperature of the exposure stage 11 is controlled by detecting the temperature of the pressure developing device 22 or the temperature in the vicinity thereof, the quality is always stable regardless of the temperature change of the pressure developing device 22 or the temperature in the vicinity thereof. image is output.

Next, a third embodiment will be described with reference to FIG. Incidentally, in the description, the same numbers are given to the parts that have the same functions and effects as those in the first embodiment.

FIG. 10 shows the change in Dmin, which indicates the ease of reproducing white, the temperature of the pressure developing device 22, the pressing speed of the microcapsule paper 12 in the pressure developing device 22, and the pressing force of the pressure developing device 22, respectively. Each change is shown below.

As is clear from the graph, it can be seen that as the temperature of the pressure developing device 22 rises or as the pressure increases, the white reproducibility deteriorates, and as the pressure speed increases, the white reproducibility improves.

Due to this phenomenon, for example, when the temperature of the pressure developing device 22 increases due to an increase in the temperature inside the device and the white reproducibility deteriorates, the temperature of the pressure developing device 22 is detected using the temperature sensor 22d, and the pressure is applied. Deterioration of white reproducibility can be prevented by adjusting the speed or pressure. Note that in order to change the pressure speed, it is sufficient to change the rotation speed of the large diameter pressure roller 22a, and to adjust the pressure force, it is sufficient to change the rotation speed of the large diameter pressure roller 22a.
What is necessary is to change the pressing force of the large-diameter pressure roller 22a of the roller 2b.

The present invention is not limited to the embodiments detailed above,
Various modifications can be made without departing from the spirit of the invention.

In the above-mentioned embodiments, an embodiment in which the present invention is embodied in a copying machine has been described, but the present invention can also be applied to other image forming apparatuses such as printers.

Further, in the above embodiment, the standard filter insertion amount and light amount are set according to the temperature detected by the temperature sensor 22d, but a control key is provided on the key panel 109 to control the output image. You may manually input the color tone using the control keys according to your preference.

Further, in the above-described embodiment, the hue is controlled by controlling the amount of filter insertion, but a light source may be provided for each filter, and the hue may be controlled by controlling the amount of light from the light source.

[Effects of the Invention] As detailed above, according to the present invention, even when the image forming apparatus is used for a long time, the temperature of the pressure developing device or
It is possible to provide an image forming apparatus that can obtain images of stable quality without being affected by nearby temperatures.

[Brief Description of the Drawings] Figures 1 to 5 show an embodiment of the present invention in a copying machine. Figure 1 is a schematic configuration diagram of the entire device, and Figure 2 is a schematic diagram of a filter. 3 is a schematic diagram of the sub-exposure unit, FIG. 4 is a block diagram showing the electrical configuration, FIG. 5 is a flowchart showing the exposure control operation, and FIGS. FIG. 6 is a diagram showing only the main parts of the apparatus, FIG. 7 is a diagram showing the relationship between the gamma characteristics of microcapsule paper and the temperature of the exposure table and the pressure developing device, and FIG. 8 is a diagram showing an example. is microcapsule paper Dmin
A diagram showing the relationship between and the temperature of the exposure table and the pressure developing device,
FIG. 9 is a flowchart showing the operation, and FIG. 10 is a diagram explaining the third embodiment.
FIG. 3 is a diagram showing the relationship between in, the temperature of the pressure developing device, the pressing speed of microcapsule paper in the pressure developing device, and the pressing force of the pressure developing device. In the figure, 6 is a filter, 5a is a halogen lamp, 80 is a sub-exposure unit, 22b is a temperature sensor, 103 is a CPU,
12 is microcapsule paper. Fig. 2 Fig. 7 Transposition ◆ - Univocality - High contrast Fig. 8 Meine - min - Dark

Claims (1)

[Scope of Claims] 1. An image forming apparatus that forms a color image by exposing a photosensitive recording medium to light having image information to form a latent image, and then passing the latent image through a pressure developing device, comprising: The image forming apparatus is characterized by comprising a temperature detecting means for detecting the temperature of the developing device or the temperature near the pressure developing device, and an adjusting means for adjusting image forming conditions based on information from the temperature detecting means. image forming device. 2. The image forming apparatus according to claim 1, wherein the adjusting means comprises a hue adjusting means for adjusting the spectral characteristics of the light irradiated onto the photosensitive recording medium. 3. The image forming apparatus according to claim 2, wherein the adjusting means further includes a light amount adjusting means for adjusting the amount of light irradiated onto the photosensitive recording medium. 4. The image forming apparatus according to claim 1, wherein the adjusting means is constituted by a temperature adjusting means for adjusting the temperature in the vicinity of an exposure section that exposes a photosensitive recording medium with light having image information of the original. Device. 5. The image forming apparatus according to claim 1, wherein the adjusting means includes a pressing force adjusting means for adjusting the pressing force of the pressure developing device. 6. The image forming apparatus according to claim 1, wherein the adjusting means comprises a pressure speed adjusting means for adjusting the speed at which the photosensitive recording medium passes through the pressure developing device.