JPS6194451A - Picture information reading device - Google Patents

Abstract

PURPOSE:To halve the electrode section of a luminous body and to reduce influence of lowering of the quantity of light due to the electrode section by bending a luminous body in the light emitting section to a U shape from its central part, and thereby decreasing dispersion in quantity of light. CONSTITUTION:A fluorescent lamp 13 that becomes a luminous body forming a light emitting section is provided on a carriage 12 that constitutes the scanner section 11 of a picture information, and a U-shaped bent part is formed at the center of the fluorescent lamp 13. A photoelectric converting section 24 provided with a phototransistor TR14 is connected to the bent part formed at the center of the fluorescent lamp 13. A lighting and dimming circuit 15 is connected between sockets 22, 23 on both ends of the converting section 24 and fluorescent lamp 13. Thus, the electrode section of the fluorescent lamp as a luminous body is halved, and influence of lowering of the quantity of light due to the electrode section is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image information reading device that is provided in a copying machine or a facsimile machine, for example, and reads an original image.

[Technical background of the invention and its problems]

As this type of image information reading device, for example, the one shown in FIG. 6 is known. That is, in this device, two fluorescent lamps 41, . A beam 41 irradiates light onto a document 43 placed on a lath plate 42, and the reflected light is imaged onto a light receiving element 45 via a lens 44, so that the image information is read. Further, the fluorescent lamp 41.4.1 is kept warm by heaters 46, 46 to keep its light emission stable.
The fluorescent lamps 41, 41 and heaters 46, 46 are supplied with power through electric sockets 47, (7).Furthermore, the amount of light from the fluorescent lamps 41, 41 is detected by phototransistors 48, 413. The output thereof is sent to the lighting control circuit 49.49 of the fluorescent lamp 41.41, so that feedback control of the amount of light is performed.

However, since the conventional device requires two fluorescent lamps 41, 41, there is a large variation in the light intensity, and the disadvantage is that the fluorescent lamps 41, 41 have four electrodes, which are affected by the reduction in the light intensity of the electrodes. there were. In addition, the power supply socket 4
7... and two lighting control circuits 49 are required, so it is necessary to measure the amount of light in the central part of the fluorescent lamp 41, 41 where the lighting state is most stable. 46
．． The existence of 46 and the need for compactness led to extremely difficult drawbacks.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a highly reliable method that is capable of canceling out shadows caused by folds and other factors in a document, while having a simple configuration. The present invention aims to provide an image information reading device.

[Summary of the invention]

In order to achieve the above-mentioned objects, the present invention has a light-emitting section formed by bending a single light-emitting body into a U-shape from its center, thereby simplifying the structure, facilitating safety inspection, and improving reliability. The aim is to improve

[Embodiments of the invention]

The present invention will be described below with reference to an embodiment shown in FIGS. 1 to 5.

FIG. 1 shows the appearance of the image information reading device, and FIG. 2 shows the image information reading device mounted on an image forming apparatus. The image information reading device 1 is provided with a document cover 2 that can be freely opened and closed, and a document table 42 made of transparent glass on which a document is placed is provided below the cover 2. This image information reading device 1 has a scanner section X (details of which will be described later) consisting of an exposure optical system that moves back and forth on the underside of the document table to optically scan a document set on the document table. It converts optical information photoelectrically, and an operation ΔN/I/J is provided on the top surface. This operation/4' panel 3 is the print key 3 that instructs to start glint.
&, numeric keypad 3b for specifying the number of prints, clear stock key J for canceling the number of prints or instructing to stop printing
c. Number display 3d1 for displaying the number of prints, etc.; Halftone mode key 3; specifying the halftone mode and its density for full color; 3; Specifying the binary mode for monochromatic or 7-color color and its density; Binary mode key 3f1
It consists of a mode display 3g for displaying set mode keys and a display 3h for various displays.

The output signal of the image information reading device 1 is supplied to an image forming section 5 detachably provided on the right side of the image forming apparatus main body 4, and in this image forming section 5, an image is formed on a sheet of paper as a transfer material. Ru. An operation panel 6 is provided on the upper front side of the image forming section 5 . An image information reading device 1 connected to the image forming apparatus main body 4 is connected to the operation channel 6.
There are provided an online scanner key 6 for selecting an on-line scanner key 6, an eject key 6b to be operated when taking out a thermal transfer ribbon as a transfer agent through a door 7 provided on a side surface, and a display 6C.

Further, a guide section 8 for manually feeding paper is provided on the front surface of the image forming section 5 so as to be openable and closable, and a paper discharge tray 9 is provided on the top surface for discharging the paper after transfer. Furthermore, the image forming apparatus main body 4 located below the image forming section 5 is provided with a paper feed cassette 10 that stores paper so that it can be freely taken in and out.

On the other hand, FIG. 3 shows the configuration of the image information reading device. A fluorescent lamp 13 as a light-emitting body forming a light-emitting part H is provided on the carrier 2 that forms the scanner part 11, and this fluorescent lamp 13 is bent into a U-shape from its center. There is. The central part of this fluorescent lamp 13 is connected to a lighting control circuit 15 via a phototransistor 14, as shown in FIG.
．． It is connected to the lighting dimming circuit 15 via 22. Further, a fiber lens, e2375E, is installed between the mutually opposing parts of the fluorescent lamp 13, and a photoelectric conversion section 24 consisting of a COD element or the like provided with a color filter is installed at the lower end of this fiber lens 23. ing. Further, one end of the carriage 12 is slidably inserted into the guide shaft 16, and a so-called timing belt (toothed belt) 17 is stretched along the guide shaft 16.
installed on. This timing belt 17 is driven by a pulse motor 18. That is, the timing belt 17 is stretched between the motor pulley P1 and the idle pulley P provided on the rotating shaft of the pulse motor 180, and in accordance with the operation of the timing belt 17, the scanner section 11 moves as shown by the arrow A, It is moved in direction B. still,
19 is an A/D converter that converts the output signal of the photoelectric converter 24 into a digital signal; 20 is an A/D converter that supplies the power output from the inverter 21 to the light source 13 and converts the output signal of the photoelectric converter 19; This is a flat cable that supplies the image forming section 5 to the image forming section 5.

FIG. 4 shows a control section of the image information reading device 1. As shown in FIG. The main control section 31 is in charge of controlling the entire apparatus), and the operation panel 3 is connected to this main control section 31. Further, this main control unit 31 is connected to a scanner drive unit 33, a photoelectric conversion unit 24, a color conversion unit 34,
A storage section 35 is connected, and these are controlled according to operations on the operation panel 3. That is, when the print key 31 is pressed, the scanner driving section 33 drives the scanner section 11 to scan a document. Along with this scanning, the photoelectric conversion section 24 converts the color signal of the light obtained by the CCD element into a digital signal.

The color signal of this light is sent to the color conversion section 34 via the pass line 32.
and is thereby converted into an ink color signal. This converted color signal is stored in the storage unit 35 for each color via a path relay. The stored color signals are sequentially supplied for each color to the image forming section 5 of the image forming apparatus main body 4 via the pass line 32 and the main control section 31. The next transfer operation is performed using the ink corresponding to each color signal that has been received, and each time the transfer of a color is completed, the paper is sent back to the transfer start position, and the remaining colors are sequentially transferred in an overlapping manner. Ru.

According to this embodiment, since the light-emitting part H is formed by bending the central part of one fluorescent lamp 13 into a U-shape, it is possible to reduce variations in the amount of light and reduce the number of electrode parts by half. , the influence of a decrease in the amount of light at the electrode portion can be reduced. Also,
The number of lighting control circuits 15 and power supply sockets 22 can be reduced by half, improving the reliability of the electric circuit and facilitating maintenance and replacement. Furthermore, since the fluorescent lamp 13 is curved in a U-shape at its center, the amount of light at the center of the fluorescent lamp can also be easily measured.

Note that the present invention is not limited to the above embodiment,
A phototransistor 14 that detects the lighting state of the fluorescent lamp 13
may be replaced with another photoelectric element such as a photodiode.

Further, in the embodiment described above, the socket 22 is integrated to supply power to the fluorescent lamp 13 and the heat-retaining heater 46, but the present invention is not limited to this, and separate sockets may be used. Further, the light emitting body is not limited to the fluorescent lamp 13, and a cold cathode discharge tube, an LED array, or a tungsten lamp may be used.

In addition, it goes without saying that the present invention can be modified in various ways within the scope of its gist.

〔Effect of the invention〕

As explained above, since the light emitting part of the present invention is constructed by curving a single light emitting body from its center, it is possible to reduce variations in the amount of light, and to reduce the number of electrode parts of the light emitting body by half. The influence of reduction in light intensity due to the electrode portion can be reduced.

In addition, the number of lighting control circuits and power supply sockets can be reduced by half, which improves the reliability of the electrical circuit and makes maintenance and replacement easier.Furthermore, the amount of light in the center of the light emitter can be easily measured. It is effective.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention, in which FIG. 1 is a perspective view showing an image information reading device, FIG. 2 is a perspective view showing an image information reading device and an image forming device, and FIG. 3 is a perspective view showing a schematic configuration of an image information reading device, FIG. 4 is a block diagram showing a control circuit, FIG. 5 is a perspective view showing its optical system, and FIG. 6 is a perspective view showing a conventional example. be. H... Light emitting section, 24... Photoelectric conversion section (light receiving section), 1
3...Fluorescent lamp (luminous body) Applicant's representative Patent attorney Takehiko Suzue Figure 1

Claims (3)

[Claims] (1) In a device that irradiates a document with light from a light-emitting section and guides the reflected light to a light-receiving section through an optical system to read an image of the document, the light-emitting section bends the light-emitting body from its center into a U-shape. An image information reading device characterized in that it is configured by: (2) The image information reading device according to claim 1, wherein the optical system and the light receiving section are arranged in the middle of the U-shaped light emitter. (3) The image information reading device according to claim 1 or 2, wherein the light emitting body is a fluorescent lamp.