JPH02118631A - Image forming device - Google Patents

Abstract

PURPOSE:To achieve high speed image formation and to shorten the time of image formation according to the kind of an original by providing a mode under which exposure speed is highly increased, a means selecting it, and a means controlling it. CONSTITUTION:In normal coping, a high speed mode selecting key 43' is turned off, and a controller 44 drives a filter part 9a and causes filters to be inserted into an optical path in order to match colors. In this case, because light quantity is lost due to the filters, exposure speed can not be highly increased, and it takes much time to copy. On the other hand, in high speed, short-time copying where an original permits a little color slippage, the high speed mode selecting key 43' is turned on. The controller 44 drives the filter part 9a in order to cause the filter to retreat from the inside of the optical path. Thus, copying can be performed in a normal mode when a user copies an original requiring a picture with high color-reproducibility, and in a high speed mode when a user copies an original permitting color slippage in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus using a photosensitive recording medium, and particularly to an image forming apparatus capable of increasing image forming speed.

[Prior Art] Image forming apparatuses that record and copy images of color originals using photosensitive and pressure-sensitive recording paper are equipped with filters for color tone adjustment in order to obtain images with colors close to the original colors of the original. It is known what happened. That is, this filter is inserted on the optical path of the original image, and changes the light transmission characteristics according to the sensitivity characteristics of a photosensitive recording medium such as a photosensitive pressure sensitive recording medium, thereby adjusting the tone of the copied image.

[Problems to be Solved by the Invention] However, in the image forming apparatus configured as described above, by inserting a color tone adjustment filter on the optical path,
In addition to cutting out unnecessary colored light, it also cuts out some of the necessary colored light, so it is necessary to take steps such as increasing the amount of light from the light source used to expose and scan the original, or slowing down the exposure speed. .

On the other hand, when a photosensitive recording medium with poor sensitivity, such as a photosensitive pressure sensitive recording medium, is used, the amount of light is often increased to near the limit of the light source. Therefore, there is a problem that the exposure speed has to be reduced, that is, the time for copying etc. has to be increased, and therefore it takes time to form an image.

On the other hand, some originals, such as text originals, do not cause any problems even if the colors are slightly misaligned, and in the case of such originals, it is better to perform image formation at high speed and in a shorter time than adjusting the color misalignment. What is desired is something that can give priority to what is done.

The present invention meets the above requirements, and eliminates light loss without inserting a color tone adjustment filter into the optical path as necessary, thereby increasing exposure speed and shortening image forming time for copying, etc. It is an object of the present invention to provide an image forming apparatus that can achieve the following objectives.

[Means for Solving the Problems] In order to achieve the above object, an image forming apparatus according to the present invention is an image forming apparatus that forms an image by exposing an original image to a photosensitive recording medium. It is equipped with a removable filter for color tone adjustment, a selection means for selecting a high-speed mode for increasing the exposure speed, and a control means for removing the filter from the optical path when the high-speed mode is selected. be.

[Function] In the image forming apparatus of the present invention having the above configuration, when the high speed mode is selected, the exposure speed is increased, the filter is removed from the optical path, and there is no loss in the amount of light due to passing through the filter. The image forming time can be shortened.

[Embodiment] FIG. 1 shows a schematic configuration of a light- and pressure-sensitive copying machine capable of full-color copying according to an embodiment of the present invention. The photosensitive paper made of microcapsule paper and developer paper used in the copying machine of this embodiment has been proposed in Japanese Patent Application Laid-Open No. 58-88739, and will not be described in detail here.

The photosensitive and pressure sensitive copying device Ill is composed of a document table crow 2 and a document table cover 3, the top plate of which is movable in the left and right direction.
A desired original is set face down on the original platen glass 2.

A light source consisting of a halogen lamp 4 extending in a direction perpendicular to the direction of movement of the document platen glass 2 and a semi-cylindrical reflecting mirror 5 arranged so as to surround it is disposed on the upper right side of the copy ii. Light is irradiated in a line toward the stand crow 2. Therefore, the light emitted from the halogen lamp 4 spreads over 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.
Perform primary irradiation. The light emitted from the light source passes through the transparent document table glass 2 and is reflected by the document placed thereon, thereby exposing and scanning the document. Note that the upper surface of the document table glass 2 is covered with a document table cover 3 so that the irradiated light does not leak from parts other than the document.

In addition, in order to use the light emitted from the halogen lamp 4 to irradiate the document with high efficiency, a reflector 6 is placed on the left side of the light source to reflect the light that is not directed directly toward the document and use it again to irradiate the document. . A fan 7 and a louver 8 are provided on the right side of the halogen lamp 4 to draw air from the outside.
This allows cooling air to be applied to the document table glass 2 efficiently.

Light emitted from the halogen lamp 4 and reflected from the document placed on the document table glass 2 passes through the filter 9 and enters the lens 10 . This filter 9 is for adjusting the color tone of the copied image, and is provided in the optical path so that it can be inserted and removed freely.
The light transmission characteristics are changed and controlled according to the sensitivity characteristics of the microcapsule paper 11. The lens 10 is attached to a lens mounting plate 12, and allows minute angle adjustment to the optical path.

The light focused by the lens 10 passes through a pair of reflecting mirrors 1.
3.13, the direction is changed by 180 degrees, and an image is formed on the microcapsule paper 11 closely placed below the exposure table 14. The reflecting mirrors 13.13 are mounted on a mirror mounting plate 15, and by finely adjusting the mounting position of the mirror mounting plate 15, the optical path length and focus are adjusted.

On the other hand, a long microcapsule paper 11 is wound around a cartridge shaft 16 and housed in a removable cartridge 17 disposed below the document table crow 2. and the pressure developing device 18 before reaching the winding shaft 19. That is, the microcapsule paper 11 coming out from the lower part of the car 1 edge 17 is transferred to the feed roller 20, tie roller 21, and nip roller 21.
' and then passed below the exposure table 14, and then supplied to the pressure developing device 18. The microcapsule paper 11 that has passed through the pressure developing device 18 is guided to a peeling roller 22 and a meandering adjustment roller 23, and then wound onto a winding shaft 19. Note that the unexposed microcapsule paper 11 after leaving the cartridge 17 is maintained in an unexposed state by the light shielding cover 24.

The conveyance speed of the microcapsule paper 11 is controlled to be constant by the capsule paper feed roller 25, and is made to match the moving speed of the document table crow 2, so that the microcapsule paper 11 is A latent image of a predetermined line of a document is formed every month.

Further, a developer paper cassette 27 is provided below the pressure developing device 18, and the developer paper 26 is taken out one by one by a half-moon-shaped paper feed roller 28. After the leading end is aligned by the rollers 29 and the registration gate 30, the paper is transported to the paper entrance of the pressure developing device 18.

Thus, the pressure developing device 18 is loaded with microcapsule paper 1.
1 and the developer paper 26 are supplied in a state where they are in close contact with each other and are integrated. The pressure developing device 18 is composed of a small diameter roller 31 and a backup roller 32. The microcapsule surface on which the latent image of the microcapsule paper 11 has been formed and the developer-coated surface of the color developer paper 26 come into contact with each other on the inside and are held together by the small diameter roller 31 and the backup roller 32, and pressure is applied. Added. This pressure destroys the unexposed microcapsules and forms an image on the color developing paper 26. The pressure developing device 18 and the heat fixing device 33 (described later)
constitute the process means for image formation.

The microcapsule paper 11 and color developer paper 26 that have come out of the pressure developing device 18 are conveyed by a capsule paper feed roller 25.
The microcapsule paper 11 and the color developing paper 26 are separated by the peeling roller 22 . The color developing paper 26 is accelerated to develop color by the heat fixing device 33 to form an image, and then transferred to the paper output tray 34.
It is transported with the image side up. The heat fixing device 33 is a hollow chamber having a heater 35 and a temperature sensor 36 inside.
It is composed of a troller 37 and a color developing paper feed roller 38. Note that the separated microcapsule paper 11 is passed through a meandering adjustment roller 23 and wound around a winding shaft 19.

Also, there is a setting operation section 43 for inputting a copying operation start command, copying magnification, etc., and a control device 44 to which signals from the setting operation section 43 are input and controlling each section for image formation.
is equipped with. In particular, in the present invention, the setting operation section 43 is provided with a key 43' constituting a selection means for selecting a high-speed mode for increasing the exposure speed.
When the high speed mode is selected by the operation 3', the control device 44 includes a control means that functions to speed up the operation of the exposure system and remove the filter 9 from the optical path.

The configuration of a control system mainly including the control device 44 for carrying out the above control will be explained below with reference to FIG. 2. In the figure, the control device 44 includes a central processing unit (CPU) 101, a ROM 102 in which predetermined program data, etc. are stored in addition to programs corresponding to the flowchart shown in FIG. 3, and a ROM 102 in which various data are stored. It consists of a RAM 103 and an input/output board 104.

This control device 44 performs predetermined arithmetic processing based on human data and a predetermined program, and
4 to control various loads of the copying process as follows. The light source section 4a controls the amount of light of the halogen lamp 4, that is, the amount of exposure, the document moving section 2a controls the moving speed of the document table crow 2, and the filter section 9a controls the amount of insertion of the filter 9 into the optical path, that is, the color correction conditions. The lens moving section 10a moves the lens 10 along the optical path according to the copying magnification (enlargement/reduction), and the microcapsule paper conveyance control section 11a moves the microcapsule paper 11 using a feed roller 20 or the like. The pressure development controller 18a rotates the small-diameter roller 31 in the pressure development device 18 at a constant speed of 0 to 1000 degrees, and presses and releases it from the backup roller 32. The developer paper transport unit 26a rotates the paper feed roller 28 and the developer paper roller 29 to transport the developer paper 26 to the pressure developer 18, and also opens the registration gate 30 at a predetermined timing. Developing paper 2
The heat fixing device control unit 3
Reference numeral 7a controls the amount of heat generated by the heat roller 37 in the heat fixing device 33.

The operation of the above configuration will be explained below.

Now, after opening the document cover 3 and placing the document on the document glass 2, when you press down the exposure start switch (not shown), the document glass 2 moves to the right and the document glass 2 Stops at the position where the left end faces the light source. after that,
With the halogen lamp 4 turned on, the document table glass 2 is moved to the left. The light emitted from the halogen lamp 4 is reflected by the original, and then passes through the filter 9 and the lens 1.
0 and a pair of reflective mirrors 13.13,
An image is formed on the microcapsule paper 11 located below the exposure table 14. At this time, the microcapsule paper 11 is moved to the left on the exposure table 14 at the same speed as the moving speed of the document table crow 2, so that an image on the document or a latent image is formed on the microcapsule paper 11. Ru.

As the document table crow 2 moves to the left, the paper feed roller 2
The developer paper 26 is taken out from the developer paper cassette 27 by 8 and supplied to the pressure developing device 18 without being superimposed on the hazy microcapsule paper 11, where the latent image on the microcapsule paper 11 is developed. The image is transferred onto developer paper 26. Thereafter, the developing paper 26 is thermally fixed by the thermal fixing device 33 and then discharged outside the copying machine 1 . On the other hand, the microcapsule paper 11 that has passed through the pressure developing device 18 is sequentially wound onto the winding shaft 19. When the right end of the document platen glass 2 finishes moving to a position facing the light source, copying of the document is completed and the halogen lamp 4 is turned off.

Next, the operation of inserting and removing the filter 9 for color adjustment into and out of the optical path in the copying operation will be described with reference to the flowchart of FIG. 3.

In the normal backward mode, the high-speed mode selection 'F-43' is not turned on, and the control device 44 drives the filter section 9a to insert the filter 9 into the optical path for color matching (step Sl, S2.S3).

In this case, since the filter 9 causes a loss of light quantity, the exposure speed cannot be increased, and copying takes time.

On the other hand, when the original has no meaning in its own color, such as a graph or chart, where the colors may be slightly off-center, and you want to copy it at high speed in a short time, use high-speed copying. Turn on mode selection A・-43'. Thereby, the control device 44 drives the filter section 9a to move the filter 9 out of the optical path (step S4).

In this way, for originals for which you want to obtain images with high color reproducibility,
You can copy in the normal mode, and if you want to copy a document in which there may be some color deviation and you would rather work in a short time, you can select the high-speed mode and copy. It should be noted that the present invention is not limited to the above-described embodiments and can be modified in various ways. For example, something other than a key may be used as the selection means, and the image forming apparatus may be used for color tone adjustment. Any type of copying machine may be used as long as it uses a filter.

[Effects of the Invention] As described above, the image forming apparatus according to the present invention provides a mode for increasing the exposure speed without inserting a color tone adjustment filter into the optical path, a means for selecting the mode, and a means for controlling the mode. Therefore, if the high-speed mode is selected as appropriate depending on the type of document, image formation can be performed at high speed without loss of light amount, and the image formation time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of an image forming apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of a control device portion of the apparatus, and FIG. 3 is a flowchart showing exposure control operations in the apparatus. . 1... Photosensitive and pressure sensitive copying machine, 2a... Original platen moving unit, 4
a... Light source section, 9... Filter, 9a... Filter section, 11... Microcapsule paper, 43'... High speed mode selection key, 44... Control device (control means). Applicant: Brother Industries, Ltd.

Claims (1)

[Claims] (1) An image forming device that forms an image by exposing an original image onto a photosensitive recording medium has a color tone adjustment filter that is removably installed in the optical path of the original image, and a high-speed mode that increases the exposure speed. An image forming apparatus comprising: a selection means for making a selection; and a control means for removing the filter from an optical path when the high-speed mode is selected.