JPH0216534A - Image forming device - Google Patents

Abstract

PURPOSE:To stabilize the color balance of an output image even if a source voltage varies by detecting the variation of the source voltage and controlling an exposure lamp so that the color temperature of light emitted by an exposure lamp is constant. CONSTITUTION:This device is provided with a means which detects the variation of the source voltage and a means which controls the exposure lamp according to the detected voltage so that the color temperature of the irradiation light is constant. Namely, a source voltage input part 51 is connected to the power source of the exposure lamp 3 and the value of the source voltage is converted by an A/D converter 51a into digital data, which is inputted to a CPU 52. The CPU 52 reads an angle of conduction required to hold the color temperature of the light emitted by the exposure lamp 3 constant against the variation of the source voltage out of a storage part 53 according to the digital data. Then a control signal is sent to a phase control part 50 connected in series with the exposure lamp 3 to perform phase control so that the color temperature of the irradiation light of the exposure lamp 3 is constant. Consequently, even if the source voltage varies, the color temperature of the emitted light is held constant, so the stable output image is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus that records an image on a photosensitive recording medium based on predetermined image information.

[Prior Art] Conventionally, this type of image forming apparatus irradiates a document with light and forms an image of the reflected or transmitted light on a photosensitive recording medium through an optical system such as a reflecting mirror, filter, or lens. , a device configured to form a latent image on the photosensitive recording medium is known.

[Problems to be Solved by the Invention] However, in this type of image forming apparatus, when the power supply voltage fluctuates, the color temperature of the light emitted from the exposure lamp also changes, so there is a problem that the color balance of the output image is unstable. There was a point.

The present invention has been made to solve the above-mentioned problems, and detects the power supply voltage of an image forming apparatus, controls the exposure lamp according to the voltage value, and always keeps the color temperature of the irradiated light constant. The purpose of this is to stabilize the color balance of the output image.

[Means for Solving the Problems] In order to achieve this object, the image forming apparatus of the present invention has the following features:
Based on the means for detecting fluctuations in power supply voltage and the detected voltage,
and means for controlling the exposure lamp so that the color temperature of the irradiated light is constant.

[Function] According to the present invention having the above configuration, even if the power supply voltage of the image forming apparatus fluctuates, the color temperature of the light emitted from the exposure lamp is kept constant, so that a stable output image can be obtained. be able to.

[Example] Hereinafter, in order to explain the present invention more specifically, an example will be given and explained.

FIG. 1 is a schematic cross-sectional view of a photosensitive pressure-sensitive copying machine that is capable of full-color copying. Incidentally, a photosensitive paper (consisting of microcapsule paper and color developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-Open No. 58-88739, etc., and will not be described in detail here.

As shown in the figure, the photosensitive and pressure-sensitive copying machine 40 is composed of an original platen glass 2 and an original platen cover 1, the top plate of which is movable in the horizontal direction.A desired original is placed face down on the original platen glass 2. Can be placed in any condition. A light source consisting of a halogen lamp 3 extending in a direction perpendicular to the direction of movement of the original platen glass and a semi-cylindrical reflecting mirror 4 arranged to surround it is fixed to the upper right side of the copying machine 40, and a light source is fixed to the upper right side of the copying machine 40. Light is irradiated in a line toward the base glass 2.

Therefore, the light emitted from the halogen lamp 3 can sequentially illuminate the entire surface of the document table glass 2 from the left end to the right end by moving the document table glass 2 in the left-right direction. The light emitted from the light source passes through the transparent original platen glass 2 and is reflected by the original placed on it. A document table cover 1 is provided to cover the document table.

In addition, in order to use the light emitted from the halogen lamp 3 to irradiate the original with high efficiency, a beam flap 5 is arranged to the left of the light source to reflect the light that is not directly directed toward the original and use it again to irradiate the original. .

A fan 6 and a louver 7 are provided to the right of the halogen lamp to draw air from the outside. As a result, air can be efficiently applied to the document table glass 2. Light emitted from the halogen lamp 3 and reflected from the document placed on the document table glass 2 passes through the filter 8 and enters the lens 9 .

The filter 8 is used to change the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 37 and adjust the color tone of the copied image. The lens 9 is attached to a lens mounting plate 10, and allows minute angle adjustment with respect to the optical path.

The light focused by the lens 9 is deflected by 180" by two reflecting mirrors 11, and is imaged on the microcapsule paper 37 that is closely positioned below the exposure table 19. The two reflecting mirrors 11 are mirrors. The mirror is fixed to a mounting plate 12, and the optical path length and focus are adjusted by finely adjusting the mounting position of the mirror mounting plate 12.

On the other hand, a long microcapsule paper 37 is wound around a cartridge shaft 14 and housed in a removable cartridge 13 placed below the document table glass 2, and one end of the paper is connected to a large number of rollers. It reaches the winding shaft 25 via the pressure developing device 20.

That is, the microcapsule paper 37 coming out from the lower part of the cartridge 13 is guided by the feed roller 15 and the tie roller 17, passes below the exposure table 19, and then is supplied to the pressure developing device 20. Thereafter, the microcapsule paper 37 that has passed through the pressure developing device 20 is guided to a peeling roller 23 and a meandering adjustment roller 24, and then wound onto a winding shaft 25. The unexposed microcapsule paper 37 after leaving the cartridge 13 is maintained in an unexposed state by the light shielding cover 16.

The transport speed of the microcapsule paper 37 is controlled to be constant by the capsule paper feed roller 22, and is made to match the moving speed of the document platen glass 2, so that the microcapsule paper 37 is Latent images of predetermined lines of the document are sequentially formed.

Further, a developer paper cassette 32 containing cut paper type developer paper 38 is provided below the pressure developing device 20, and the developer paper 38 is taken out one by one by a half-moon roller 33 and transferred to the developer paper roller 34 and the resist. After the leading end is aligned by the gate 35, the paper is transported to the paper entrance of the pressure developing device 20.

Therefore, the pressure developing device 20 includes the micro-pressure paper 37.
The color developer paper 38 and the color developer paper 38 are supplied in a state where they are in close contact with each other and are integrated. The pressure developing device 20 is composed of a small diameter roller 21 and a backup roller 31. Microcapsule paper 37
The microcapsule surface on which the latent image is formed and the developer-coated surface of the color developer paper 38 are in contact with each other on the inside, and are sandwiched between the small diameter roller 21 and the backup roller 31 and pressure is applied. This pressure destroys the unexposed microcapsules and forms an image on the developer paper 38.

The microcapsule paper 37 and the color developer paper 38 that have come out of the pressure developing device are conveyed by the capsule paper feed roller 22, and the microcapsule paper is moved upward by the peeling roller 23, and the color developer paper 3 is transported by the peeling roller 23.
8 are orthogonally separated.

After color development is promoted by the heat fixing device and an image is formed on the color developer paper 38, the paper is conveyed to the paper discharge tray 27 with the image side facing up. The heat fixing device is composed of a hollow heat roller 29 having a heater 30 inside and a color developing paper feed roller 28.

The separated microcapsule paper passes through a meandering adjustment roller 24 and is wound around a winding shaft 25.

The operation of the apparatus configured as described above will be explained below.

Now, after opening the document platen cover 1 and placing the original on the document platen glass 2, if you press the start button (not shown), the document platen glass 2 will first move to the right in FIG. The left end of the platform slider 2 stops at a position facing the light source. After that, with the halogen lamp 3 turned on,
Move the document table glass 2 to the left. The light emitted from the halogen lamp 3 is reflected by the original, then reflected by the filter 8, lens 9, and two reflection mirrors 11, and then formed into an image on the microcapsule paper 37 located below the exposure table 19. be done. At this time, the microcapsule paper 37 is moved to the left on the exposure table 19 at the same speed as the moving speed of the document table glass 2, so that the image on the document is formed as a latent image on the microcapsule paper 37. .

As the document platen glass 2 moves to the left, the half-moon roller 3
3, the color developer paper 38 is taken out from the color developer cassette 32 and is supplied to the pressure developing device 20 in a state where it is overlapped with the exposed microcapsule paper 37, and the latent image on the microcapsule paper 37 is developed and developed. The image is transferred onto colored paper 38.

Thereafter, the developing paper 38 is thermally fixed by a thermal fixing device and then discharged from the copying machine 40 . On the other hand, pressure developing device 20
The microcapsule paper 37 that has passed through the winding shaft 2 is
It is wound up in 5. When the document platen glass 2 finishes moving to a position where its right end faces the light source, copying of the document is completed and the halogen lamp 3 is turned off.

Next, control of the exposure lamp 3 will be explained with reference to FIG. The power supply voltage input section 51 is connected to the power supply of the exposure lamp 3, so that the power supply voltage value is input to the A/D converter 51a.
The data is converted into digital data and input to the CPU 52. Based on the digital data, the CPU 52 extracts from the storage section (table) 53 the necessary conduction angle to keep the color temperature of the light emitted from the exposure lamp 3 constant against fluctuations in the power supply voltage. The CPU 52 also operates a phase control unit 5 connected in series with the exposure lamp 3 to the power source.
0, and phase control is performed to keep the color temperature of the light irradiated by the exposure lamp 3 constant.

Figure 3 shows the relationship between lamp input voltage and color temperature when a halogen lamp is used as the exposure lamp 3, and Figure 4 shows the relationship between lamp input voltage and color temperature, which is necessary to keep the color temperature constant after the power supply voltage changes. 5 shows the conduction angle of the phase control section 50. The values shown in FIG. 4 are stored in the storage section 53,
By drawing out the light when necessary and controlling the phase, the color temperature of the light irradiated by the exposure lamp 3 can be kept constant.

The present invention is not limited to the embodiments detailed above, and various changes can be made without departing from the spirit thereof.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, fluctuations in the power supply voltage are detected and the exposure lamp is controlled so that the color temperature of the light emitted from the exposure lamp is constant. Therefore, even if the power supply voltage fluctuates, the color balance of the output image remains stable.

[Brief explanation of the drawing]

1 to 4 show embodiments embodying the present invention. FIG. 1 is a schematic diagram of a copying machine to which this embodiment is applied, and FIG. 2 is a schematic diagram for controlling an exposure lamp. Configuration diagram, 3rd
The figure shows the relationship between lamp applied voltage and color temperature, and FIG. 4 shows the power supply voltage and conduction angle for keeping the color temperature constant. In the figure, 3 is an exposure lamp, 50 is a phase control section, and 51 is a power supply voltage input section.

Claims (1)

[Scope of Claims] 1. In an image forming apparatus that forms an image on a photosensitive recording medium by irradiating light from a light source based on image information, means for detecting a power supply voltage of the image forming apparatus; An image forming apparatus comprising: means for controlling an exposure lamp so that the color temperature of the irradiated light is constant based on the detected voltage.