JPH03264944A - Image forming device - Google Patents

Abstract

PURPOSE:To improve workability and to reduce the cost by sharing a light source, reflecting member, etc., by making the light source of a means for exposing with light reflected from an original the same as a means for exposing with a translucent light from the original. CONSTITUTION:The light source 1 as the means for exposing with light reflected from an original placed on an original platen 12 is made the same as the means for exposing with light transmitted from the original 6. The light emitted from the rod-like light source 1 is condensed to the surface of the original placed on the original platen glass 12 by a reflector 2 and diffused and reflected. The reflected light is image-formed on a photosensitive body 14 by a condensing lens array 13. On the other hand, when the translucent original 6 is irradiated with irradiating light, the picture of the translucent original 6 is formed on the photosensitive body 14 by a projecting lens 7 and reflecting mirrors 8 and 9. By making the light source the same in such a manner, not only the device function is improved but also the total cost can be reduced.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to an image forming apparatus using a photoreceptor, and more particularly to an image forming apparatus that forms an image from a light-reflecting original and a light-transmitting original. Concerning configuration.

[Prior Art] Conventionally, an image forming apparatus using a photoconductor has an exposure unit that irradiates light onto a document placed on a platen glass and forms an image of the reflected light on the photoconductor using a lens. When exposing light transmitted through a document such as a slide, it was common to use a separate light source.

[Problems to be Solved by the Invention] However, in the conventional example described above, when forming an image from a light-transmitting original such as a slide or OHP, a separate exposure means is attached or a device exclusively for transparent originals is used. I had to.

In other words, it is necessary to purchase a separate exposure means or a dedicated device, which increases the cost. Further, there is a problem in that the installation and removal of the separate exposure means deteriorates the workability.

The present invention is intended to solve these problems, and its purpose is to improve work efficiency by incorporating not only a means for exposing by reflected light from the document but also an exposure means for forming an image from the light transmitted by the document. Furthermore, by creating a structure in which at least one member such as a light source and a reflective member is shared, the total cost is lower than that of the conventional method.

[Means for Solving the Invention] The present invention solves these problems, and includes an image forming apparatus that includes a photoreceptor, an exposure means, a developing means, and a fixing means. and a means for exposing by light transmitted through the original, the light source of the means exposing by the light reflected from the original being the same as the light source of the means exposing by the light transmitted by the original. do.

Further, the reflecting member of the means for exposing with the reflected light of the original is the same as the reflecting member of the means of exposing with the transmitted light of the original.

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

FIG. 1 is a side sectional view showing a state in which the reflective original of the embodiment is exposed to light.

First, an image forming method using the reflective exposure means of this embodiment will be explained based on FIG.

Light emitted from the rod-shaped light source 1 is focused by a reflector 2 onto the surface of a document (not shown) placed on a document table glass 12, and is diffusely reflected. The diffusely reflected light is imaged onto the photoreceptor 14 by the condensing lens array 13.

The photoreceptor 14 has a structure in which microcapsules containing a dye precursor such as leuco dye are coated on a sheet made of PET or the like as a base material.

In the figure, 15 is a transfer member. The transfer member 15 uses paper, polyethylene terephthalate, or the like as a base material, and its surface is coated with a coloring agent that develops color by reacting with the dye precursor coated on the photoreceptor 14.

The exposed photoconductor 14 and the transfer member 15 are pressed together by a pressure developing means 16, so that an image is formed on the transfer member 15. The image is formed on the transfer member 15 on which the image is formed through zero or more processes in which the image is fixed by the fixing means 17.

Next, a configuration for exposing a transparent original will be described.

FIG. 2 is a side sectional view showing the exposure state of the transparent original of this embodiment.

In FIG. 2, the light beam emitted from the rod-shaped light source 1 is directed toward the center of the projection lens 7 by the deflector 2. The condenser lens 3 has a shape cut out of a cylinder (cylindrical shape) as shown in FIG. There is. By adopting such a shape, the traveling direction of the light ray passing through the vertical plane 41 does not change. Similarly, in the condenser lens 5, the traveling direction of the vertical component of the light ray does not change.

Therefore, returning to FIG. 2, the condenser lens 3,
The light beam passing through the reflector 5 is irradiated toward the center of the projection lens 7 due to the characteristics of the reflector 2.

Here, by irradiating the irradiation light onto the transparent original 6, the image of the transparent original is projected onto the projection lens 7, the reflecting mirrors 8 and 9.
An image is formed on the photoreceptor 14 by this.

Next, regarding the horizontal component of the light beam emitted from the rod-shaped light source 1 of the means for exposing a transparent original explained in FIG.
The explanation will be based on FIG. 3, which is a plan view of FIG. 1.

Some rod-shaped light sources have a plurality of light emitting points on the optical axis, and others emit light over the entire length, but in this example, one having five light emitting points was used.

Among the five light emitting points, the light emitting point 18 located in the center is used as a light source for transmission exposure.

The horizontal component of the light beam emitted from the light emitting point 18 is 360
Although the light is emitted in the @ direction, the light that enters the field of view of the condenser lens 3 is converted into parallel light between the condenser lenses 3 and 5.

Next, the parallel light beams are condensed by the condenser lens 5 toward the center of the projection lens 7. The transparent original 6 emits light when irradiated with the light beam, and is exposed onto the photoreceptor 14 by the projection lens 7 and reflection mirrors 8 and 9 (not shown in FIG. 3).

Thereafter, an image is formed through a process similar to that shown in FIG.

From the reflection exposure state (Figure 2) to the transmission exposure state (Figure 1),
The process of moving to Figure) will be explained.

To change from the reflective exposure state (FIG. 2) to the transmission exposure state (FIG. 1), the bar-shaped light source 1 remains stationary and the reflector 2 is rotated by a rotating means (not shown). Here, the reflector 2 rotates about the center of the rod-shaped light source 1 so that the focal point of the reflector 2 coincides with the center of the transmission exposure path.

As explained above, by using a means that has a means for exposing by light reflected from the document and a means for exposing by light transmitted by the document, the light H1, the reflector 2, the cooling fan 10, and the lamp regulator can be used in common, and the light transmitted through the document can be used in common. When the original 6 and the photoreceptor 14 are exposed while moving in synchronization, the drive system for moving the transparent original 6 moves the original platen glass 1 during reflective exposure.
It could be used in common with the drive system that moves 2.

Although this embodiment has been described using a photosensitive sheet coated with microcapsules as the photosensitive member, similar effects can be obtained by using a photosensitive drum, photosensitive belt, photosensitive paper, etc. as the photosensitive member.

Other embodiments will be described below.

FIG. 4 is a side cross-sectional view of a second embodiment of the invention.

In FIG. 4, the rod-shaped light source 1 and the □flutter 2 are in a fixed state, and the first condenser lens 3 and the first reflection mirror 20 can be attached and detached, and it is possible to switch between the reflection exposure means and the transmission exposure means by the attachment and detachment operation. can.

First, when exposing with reflected light from a document, the first condenser lens 3 and the first reflection mirror 20 are not attached, and the structure is similar to that of the embodiment shown in FIG. 2. Therefore, the image forming method is the second one.
This is carried out through the same process as in the illustrated embodiment.

Next, a case in which exposure is performed using transmitted light from a document will be described. The first condenser lens 3 and the reflecting mirror 20 are attached to shift from the state of exposure with reflected light of the original to the state of exposure with transmitted light of the original. Further, the first condenser lens 3 and the reflection mirror 20 are fixed by a holder 19, and since they have no electrical contact, they can be easily attached and detached in the direction of the arrow 21.

Here, a first condenser lens 3 is disposed immediately before the opening of the reflector 2, and a reflection mirror 20 is positioned in the optical path between the first condenser lens and the second condenser lens 11.
, the second condenser lens 11 will be further explained.

First, the first condenser lens 3 will be explained.

It has the same shape as the first condenser lens 3 and the condenser lens 3 shown in FIG. 8 above. Because of this shape, the traveling direction of the vertical component of the light ray does not change.
Also, the horizontal component of the light beam is focused as it passes through the horizontal plane 42 of the lens, so the first condenser lens acts only on the horizontal component of the light beam.

Next, the first reflecting mirror 20 will be explained. FIG. 7 is a perspective view showing the characteristics of the first reflecting mirror 20. As shown in the figure, the vertical component of the light beam emitted from the rod-shaped light source 1 is focused by the characteristics of the deflector 2, and is reflected as parallel light by the curved shape of the reflecting mirror. On the other hand, the direction of the horizontal component of the light source cannot be changed using the deflector and the reflecting mirror.

Therefore, the first reflecting mirror acts only on the vertical component of the light beam.

Next, the second condenser lens 11 will be explained. 9th
The figure is a perspective view of the second condenser lens. Since it has a spherical shape as shown in the figure, it acts on the vertical and horizontal components of the light beam.

Returning to FIG. 4, the optical path of the vertical component of the light beam will be explained. The vertical component of the light beam emitted from the rod-shaped light source 1 is emitted so as to be focused in the direction of the document table glass 12 due to the characteristics of the reflector 2. Due to the characteristics of the first condenser lens 3, the pre-cloud ray passes through as it is and is irradiated onto the first reflecting mirror 20. In the first reflecting mirror 20, the light becomes parallel light due to the above characteristics and enters the second condenser lens 11. Furthermore, the parallel light is condensed by the second condenser lens 11 and illuminates the transparent original 6. The image of the transparent original 6 is projected onto the projection lens 7 by the irradiation light, and onto the photoreceptor 1 by the reflection mirror 8.9.
The image is formed on 4.

Here, even if the shape of the vertical cross section of the first reflecting mirror 20 described in FIG. If it's enough, there's no problem.

Next, the horizontal optical path of the light beam in this embodiment will be explained. FIG. 5 is a plan view showing the horizontal component of the optical path.

A portion of the light beam emitted from the light emitting point 18 enters the field of view of the first condenser lens 3, and due to the characteristics of the first condenser lens described above, the traveling direction of the light beam becomes parallel.

Since the first reflecting mirror 20 has a flat horizontal section, the light beam is reflected while remaining parallel, enters the second condenser lens 11, is focused toward the center of the projection lens 7, and is directed onto the transparent original 6. irradiated.

The image of the transparent original 6 is emitted by the irradiation light, and the projection lens 7
, photoreceptor 14 by reflection mirrors 8 and 9 (not shown).
is imaged.

As explained above, according to this embodiment, the reflective exposure means and the transmission exposure means include the light source 1, the reflector 2, and the cooling fan 10.
, a lamp regulator, a drive system, and a heat ray filter 4 are shared.

A third embodiment of the present invention will be described below.

61st! ! 1 is a structural diagram of a device using a bulb halogen lamp as a light source.

In FIG. 6, when an image is formed from an original (not shown) on the original table glass 12, the reflective original 6 is not mounted, and the second reflective mirror 9 is placed in the state 9b.

A portion of the light emitted from the bulb halogen lamp 31 is reflected by the reflector 32 or directly enters the condenser lens 36,37. The condenser lenses 36, 37 have a shape similar to the lens 22 in FIG. 9 of the foregoing. 6th
Returning to the figure, the light beam entering the condenser lens 36 becomes parallel light between the condenser lenses 36 and 37, and is focused by the condenser lens 37 toward the center of the projection lens 7.

Further, when it passes through the projection lens 7, the guide mirror 34a1, and the reflection mirrors 8 and 9b, it is spread out to both sides (the front side and the back side in the figure) when it reaches the document table glass 12. Further, since the reflector 32 extends to both sides, a portion of the light beam is reflected by the reflector 32, passes through both sides of the lens system, and is reflected by the first reflecting mirror 8, the guide mirror 34a, and the second reflecting mirror 9 onto the original surface. reaching the
This compensates for the portion where the amount of light on both sides is reduced due to the influence of the cosine fourth power law of the light rays that have passed through the lens system.

On the other hand, when exposing a transparent original, the transparent original 6 is mounted at the location shown in the figure, and the second reflection mirror 9 is placed in the state 9a. Further, the guide mirror 34a is housed in the state 34b and no longer reflects light on this optical path. As a result, the light emitted from the spherical halogen lamp 31 is condensed in the direction of the projection lens by the condenser lenses 36 and 37, and the light emitted from the transparent original 6 passes through the projection lens 7 and is reflected by the reflection mirror 8.
The photoreceptor 14 is exposed to light at 9a.

In this embodiment as well, the reflective exposure means and the transmission exposure means include a light source 31, a reflector 32, a cooling fan 33, a lamp regulator, a drive system, a heat filter 4, and a condenser lens 3.
6.37. Reflection mirrors are shared.

[Effects of the Invention] As described above, there are two types of exposure means: a means for exposing using reflected light from the original, and a means for exposing using transmitted light from the original.
By configuring the structure to have two or more exposure means and using the same light source, not only the functionality of the apparatus is improved, but also the light source, reflector,
This has the effect that members such as cooling fans and lamp regulators are shared.

Further, when the transparent original and the photoconductor are exposed while moving in synchronization, there is an effect that the drive system for moving the transparent original can be used in common with the drive system for moving the original table glass during reflective exposure.

Furthermore, there is an effect that the total cost can be significantly lowered, such as by eliminating the need for an external case when the transmission exposure means is a separate device.

In addition, when the transmission exposure means was a separate device, it took time to attach and detach, reducing efficiency, but by making it a stock,
It also has the effect of improving work efficiency.

As explained above, the present invention has excellent economic efficiency and workability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a reflective exposure state in an embodiment of the present invention. FIG. 2 is a cross-sectional view of a transmission exposure state in an embodiment of the present invention. FIG. 3 is a plan view related to light rays in an embodiment of the present invention. FIG. 4 is a cross-sectional view of a transmission exposure state in a second embodiment of the present invention. FIG. 5 is a plan view related to light rays in the second embodiment. FIG. 6 is a structural diagram of a third embodiment according to the present invention. FIG. 7 is a perspective view related to the light beam of the second embodiment. FIG. 8 is a perspective view of the first condenser lens according to the first and second embodiments. FIG. 9 is a perspective view of the second condenser lens according to the embodiment of FIG. 2. 3.5 2 3 4 Rod-shaped light source Reflector Condenser lens Transparent original Projection lens Original table glass Condensing lens array Photoreceptor 5 Transfer member Fig. 7 Fig. 8

Claims (2)

[Claims] (1) In an image forming apparatus composed of a photoreceptor, an exposing means, a developing means, and a fixing means, as the exposing means,
It has a means for exposing by reflected light from the original and a means for exposing by transmitted light from the original, and the light source of the means for exposing by the reflected light from the original and the light source for the means for exposing by the transmitted light from the original are the same. An image forming apparatus characterized by: (2) In the image forming apparatus, the reflecting member of the means for exposing with the reflected light of the original and the reflecting member of the means of exposing with the transmitted light of the original are the same. Forming device.