JPS62136957A - Image forming device - Google Patents

Abstract

PURPOSE:To read image information with high accuracy by providing a glow discharge tube for reading image information near a light source for image formation. CONSTITUTION:The glow discharge tube 32 for reading image information is provided integrally in a sub-reflection section 23 of a reflector 24 and lighted at image information reading. In reading an image of an original G, the glow discharge tube 32 is lighted in place of a halogen lamp 21 and light is scanned on the original G. The reflected light from the original G is received by an image sensor 31 via the 1st-3rd mirrors 24-26, an image sensor lens 29 and a filter 30 and image information is read. Since the light from the glow discharge tube 32 suitable for spectral characteristics of the image sensor 31 is used for image information of the original G, thermal characteristics are excellent and the image information is read in an excellent way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming apparatus used, for example, as an electronic copying machine.

[Conventional technology]

Generally, an electronic copying machine is equipped with an exposure lamp 1, as shown in FIG. ~The third mirror 3, 4.5 and the lens 6 are guided to the photosensitive drum 8 via the fourth mirror 7 to form an electrostatic latent image.

Incidentally, recently, a device has been developed in which the reflected light from the document G is guided to an image sensor so that image information can be read and used.

[Melting point that the invention seeks to develop]

However, in the past, the light from the above-mentioned exposure lamp (generally a mirror lamp or the like was used) was not suitable for the spectral characteristics of the image sensor i, and there was an inconvenience that image information could not be read accurately. Ta.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image forming apparatus that can read image information with high accuracy.

[Means for solving problems]

In order to achieve the above object, the present invention includes a glow discharge tube for reading image information near a light source for image formation.

[Effect]

A glow discharge tube for reading image information scans light onto the surface of a document, and the reflected light is guided to a reading sensor to read image information with high precision.

〔Example〕

The present invention will be described below with reference to an embodiment shown in FIGS. 1 to 4. In the figure, reference numeral 11 denotes a main body of the electronic copying machine, and a document glass 12 is provided on the upper surface of the main body 11.

A photosensitive drum 13 is rotatably provided within the main body 12, and a charger 14, a developing device 15, . Transfer and peeling charges 16 and 17, a cleaning device 18, and a static elimination charger 19 are provided.

Further, an optical system 20 is provided on the upper side inside the main body 11. As shown in FIG. 4, this optical system 20 is equipped with a halodan lamp 21 as a light source for copying. It is located in Further, first to fourth reflecting mirrors 24 to 27 are arranged in the optical system 20 to guide reflected light from the original G to the photosensitive drum 13. The optical system 20 is driven by a drive mechanism (not shown) and scans the original G with light.

Furthermore, as shown in FIGS. 2 and 3, a copying lens 28 and an image sensor f4 lens 29 are arranged in parallel between the third mirror 26 and the fourth mirror 27. . A filter 30 and an image sensor (reading sensor) 31 are disposed on the light output side of the image sensor +-7 lens 29.

On the other hand, a glow discharge tube 32 for reading image information is integrally provided within the sub-reflection section 23 of the reflector 24.
K is set so that the light is emitted when image information is read.

When copying, light from the Halodan lamp 21 is scanned onto the original G, and the reflected light is transmitted to the photosensitive drum through the first to third mirrors 24, 25, 26, and then through the lens 28 and the fourth mirror 27. 13, and an electrostatic latent image of the document G is formed. This electrostatic latent image is visualized by supplying developer from the developing device 15, and is transferred onto the paper P by the transfer charger 16.

The sheet P on which the image has been transferred is peeled off from the photosensitive drum 13 by the action of the peeling charger 17, conveyed, and discharged onto the sheet discharge tray 33. Further, the developer remaining on the photosensitive drum 13 is removed by the cleaning device [18], and then the surface of the photosensitive drum 13 is neutralized by the static eliminating charger 19, and the process is completed.゛In addition, when reading the image of the document G, the glow discharge tube 32 emits light instead of the halogen lamp f21 to read the document G.
The light is scanned. The reflected light from the original G is transmitted to the first to third mirrors 24, 25, 26, and further to the image sensor lens 29 and the filter 3 as shown in FIG.
0, the light is received by the image sensor 31 and image information is read.

As described above, since the light from the glow discharge tube 32 that is suitable for the spectral characteristics of the image sensor 31 is used when obtaining image information of the document G, the image information can be read satisfactorily due to its thermal characteristics.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the scope of the invention.

〔Effect of the invention〕

As explained above, since the present invention is provided with a light source for reading image information, it is possible to read images with light having excellent thermal characteristics and spectral characteristics suitable for the reading sensor, thereby obtaining stable and accurate image information. This has the effect of making it possible to

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an electronic copying machine, Fig. 2 is a configuration diagram showing its optical system, Fig. 3 is a plan view thereof, and Fig. 4 is a partially cutaway front view of the electronic copying machine.
The figure is a block diagram showing a light source section, and FIG. 5 is a block diagram showing a conventional example. G... Original, 21... Light source for image formation (halon run f), 13... Image carrier (photosensitive drum), 32...
...Glow discharge tube for reading image information, 31...Reading sensor.

Claims (1)

[Claims] In a device in which a light source for image formation scans light on a document surface and the reflected light is guided to an image carrier, a glow discharge tube for reading image information is provided near the light source for image formation, and this glow discharge An image forming apparatus characterized in that a tube scans light on the surface of the document and guides the reflected light to a reading sensor.