JPH02201345A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify a mechanism and to reduce the cost by constituting a device in such a way that plural filters are inserted and an optical path is interrupted during operations other than a copying operation. CONSTITUTION:A photosensitive, pressure sensitive copying machine 40 is composed of an original platen glass 2 whose roof part can move to the right and left and an original platen cover 1. A developing paper 38 is ejected out of the copying machine 40 after being thermally fixed by a heat fixing device. On the other hand, a microcapsule sheet 37 passing through a pressure developing device 20 is taken up around a take-up shaft 25 in sequence; when the original platen glass 2 is moved to a position where its right edge faces a light source, the copying of an original is finished, and a halogen lamp 3 is put out. After that, a control circuit 8d controls stepping motors 8a-8c; and red, green, and blue filters prevent transmission light from exposing the sheet 37 by covering the optical path. Therefore, the sheet 37 is not exposed even if the original platen cover 1 is opened in this condition. Thus, the device is mechanically simplified, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus such as a copying machine.

[Prior Art] Conventionally, this type of apparatus forms an image by focusing light from a document placed on a document table onto a photosensitive recording medium through an optical system such as a lens and a filter. This photosensitive recording medium is
A long piece is often used by wrapping it inside the device. Therefore, the photosensitive recording medium is constantly placed on the exposure table even during non-exposure. Therefore, in order to prevent exposure to light during non-exposure, a shutter is used to block the optical path after the image forming operation is completed.

Further, the filters constituting the optical system include red,
Three color filters of green, blue, cyan, magenta, and yellow are used. Particularly in an apparatus that forms an image while scanning a document, a desired color tone of the formed image can be obtained by appropriately inserting a predetermined amount of these filters into the optical path.

[Problems to be Solved by the Invention] However, the above-mentioned device requires a mechanism and a drive section for driving the shutter, and has a problem in that it is mechanically complicated and expensive.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to block the optical path with a plurality of filters without using a shutter, and to prevent exposure to light except during copying operations.

[Means for Solving the Problems] To achieve this object, the image forming apparatus of the present invention is configured to insert a plurality of filters to block the optical path except during copying operations.

"Operation" According to the present invention having the above configuration, exposure to light except during copying operations is prevented by inserting a plurality of filters.

For example, as a filter, there are three colors: red, green, and blue.
If two or more filters are used, two or three of them are inserted into the optical path. Then, since the transmission wavelength bands of the two filters do not overlap, light is completely blocked.

There are also three filters: cyan, magenta, and yellow.
If two sheets are used, all three sheets are inserted into the optical path.

[Example] Hereinafter, in order to explain the present invention more specifically, Examples 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 a document table glass 2 and a document table cover 1, the top plate of which is movable in the horizontal direction.A desired document is placed face down on the document table 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 2 and a semi-cylindrical reflecting mirror 4 arranged to surround it is fixed to the upper right side of the copying machine 40. Light is irradiated in a line toward the document table 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. halogen lamp 3
The light irradiated from the original plate and reflected from the original placed on the original platen 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, and three filters are prepared: red, green, and blue. These three filters can be inserted into the optical path by the required amount by three step motors 3a s 8 b s 8 c. This step motor 8a s 8 b s 8' has a control circuit 8d1;
installed. During exposure, this control circuit 8d controls the step motors 8a, 8b, and 8C to insert a predetermined amount of the filter into the optical path using a default value stored in advance in the memory or a value set by the user. do. Furthermore, during non-exposure, the step motors 8a, 8b, and 8c are controlled so that all the filters cover the optical path. The lens 9 is attached to a 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 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. It reaches the winding shaft 25 via the 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 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 then 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 microcapsule 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. The microcapsule surface on which the latent image of the microcapsule paper 37 is formed and the color developer paper 3
The roller 8 is sandwiched between the small diameter roller 21 and the backup roller 31 while being in contact with the developer-coated surface of 8 on the inside, and pressure is applied thereto. 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 a capsule paper feed roller 22, and the microcapsule paper 37 and the color developer paper 38 are separated by a peeling roller 23 in an upward direction and a color developer paper 38 in an orthogonal direction. 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 therein and a color developing paper feed roller 28.

The separated microcapsule paper is moved to a meandering adjustment roller 24.
It is then wound around the winding shaft 25.

The operation of the device configured as described above will be explained below with reference to the flowchart of FIG.

Now, after opening the document platen cover 1 and placing the original on the document platen glass 2, when the start button (not shown) is pressed (Sl), the document platen glass 2 first moves to the right in FIG. Then, the document platen glass 2 stops at a position where the left end faces the light source. Thereafter, with the halogen lamp 3 turned on, the document table glass 2 is moved to the left. After the light emitted from the halogen lamp 3 is reflected by the original,
It passes through a filter 8, a lens 9, and passes through two reflecting mirrors 1.
After being reflected by the light beam 1, an image is formed on the microcapsule paper 37 located below the exposure table 19. The filter 8 is
Control circuit 8d and step motor 8a s 8b
Appropriate transmission characteristics are achieved by the action of %8c (S2
). 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 the image on the document is formed as a latent image on the microcapsule paper 37. Ru.

As the platen glass 2 moves to the left, the half-moon roller 33 takes out the developer paper 38 from the developer paper cassette 32 and supplies it to the pressure developing device 20 in a state where it is overlapped with the exposed microcapsule paper 37. The latent image on the microcapsule paper 37 is developed and transferred onto the developer 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 (S3).

After that, the control circuit 8d controls the step motor 8a.
Control s 8 b % 8 c so that the red, green, and blue filters cover the optical path. Then, all visible light is blocked by these three color filters (S4). Theoretically, any two of the three filters mentioned above would be effective, but in reality, due to the characteristics of the filter, there is a small transmission wavelength band, so this implementation In the example, all three sheets are inserted to prevent the microcapsule paper 37 from being exposed to transmitted light. Therefore, even if the document table cover 1 is opened in this state, the microcapsule paper 37 will not be exposed to light.

In addition, as a filter, you can obtain any color tone by combining yellow, magenta, cyan, etc., and you can insert all or a predetermined number of filters at the same time and block the light by covering the optical path. Other combinations may be used as long as they are possible.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, the optical path is blocked by three filters without using a shutter, so the mechanism can be simplified and costs can be reduced. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of the photosensitive pressure-sensitive copying machine of this embodiment, and FIG. 2 is a diagram showing a flowchart of filter control of the photosensitive pressure-sensitive copying machine. In the figure, 8 is a filter, 8a, gb, 8( is a step motor, and 8d is a control circuit.

Claims (1)

[Claims] 1. An image forming apparatus having an optical path that guides light related to a formed image to a photosensitive recording medium and a plurality of filters inserted into the optical path, the optical path being covered by at least two filters when not forming an image. An image forming apparatus characterized by: