JPS59142536A - Original illuminating device - Google Patents

Abstract

PURPOSE:To obtain an original illuminating device which corrects a drop of a circumferential light quantity by using a slit type hot cathode fluorescent tube intended to increase an illumination efficiency. CONSTITUTION:A hot cathode fluorescent tube is constituted of a substrate glass 1 and both side face parts 8, 9 and both end face parts 10, 11 of a cover glass 7. Also, fluorescent bodis 3, 4 formed on the glass 1 are rectangular in the same way as before, but as for reflecting faces 12, 13 formed in parallel along the longitudinal direction of the fluorescent bodies 3, 4 on both side face parts 8, 9, its width becomes gradually narrow extending from the circumferential part to the center part. Said faces 12, 13 are used for raising the illumination efficiency of this fluorescent tube, and by widening gradually its width toward the circumferential part, it is possible to correct a drop of a circumferential light quantity of a lens in case of using the tube by combining it with the lens.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a document illumination device for use in copy machines, facsimile machines, digital copiers, etc., and particularly to a type of document illumination device using a slit-type hot cathode fluorescent tube.

(Prior Art) Light sources used in conventional document illumination devices include halogen wraps, fluorescent tubes, and LED arrays/4. δ - commonly known. However, although the amount of light emitted is large, the fluorocarbon lamp also generates a large amount of heat, requires a cooling structure for the device, making it difficult to make the device compact, and requires a large amount of power consumed. One fluorescent tube p4:,, +>
It's small, but the pipe diameter is thicker, so it's more compact.
There is one missing. And then the LED array is fired: '/
l i〆1″-There is a small defect with large unevenness of luminescence.

In lieu of these 11 and others, in Rukin, there is an article titled ``Report of the 1986 Electron Communication and Other Society Comprehensive 1H1 Conference 1125 Facility 7mm Dark Light Resources Using Slit Shape Heat-Shadow Yoke Light Tube'' (Ota, Kanzaki) As seen in Q), the use of hot cathode fluorescent tube document illumination devices, which are compact and have little consumption power, has been reduced by ten. As shown in Figs.
The phosphors 3 and 4 are arranged in a rectangular shape with a slit 2 between them.
are arranged in two rows t7, the other parts are shielded from light, on which the filaments 5 and 6 for hot flashing are stretched parallel to the phosphors 3 and 4, and the whole is sealed with a cover glass 7. It was formed by evacuating the inside to make it solid-walled and then sealing it, and the entire structure is indicated by a reference numeral. Note that both side surfaces 8.9 and both end surfaces 10.11 of the crow 7 each have a light blocking property. When electricity is applied to the L0 electrode of the light tube, the phosphor 3 receives the thermoelectrons emitted from the filament 5.6.
．． 4 emits light. Therefore, when an original is placed on the cover glass 7, the original is illuminated 1, and the reflected light from the original passes through the slit portion 2 to the imaging optical system.

Such a heat shade-fluorescent layer is compact, has low power consumption, and has little reduction in light intensity, but its light emission is relatively small compared to that of an LED array. Furthermore, it is necessary to correct the aperture distribution depending on the type of imaging optical system used. For example, when using a normal spherical imaging lens, the amount of peripheral illumination decreases due to its 10 efficiency and the cos fourth law, so it is necessary to correct this in the illumination unit by 75 degrees (purpose of the invention). ) Therefore, it is an object of this invention to increase the lighting efficiency by 1.
An object of the present invention is to provide a document illumination device using a throat type hot shade fluorescent tube.

The further purpose of this 6F: Ming - 1 is to provide an illumination award for the manuscripts of the ancient times that has corrected the decline of the round side light. do.

(Invention Iy) w composition) C 3 Figure 1, this invention g) - Actual @ sec) To the heat 1 in I Hatsumoto Mitsukami zo) Silkworm, temporary crow 1 and crow - crow 7
17) Both side parts 8, 9 and both end rotations 1tIO, 11
In this figure, the phosphor 3.4 formed on the substrate glass 1 has a rectangular shape similar to the conventional one, but both i#! The reflecting surface 12.13 formed parallel to the longitudinal direction of the l1 surface portion 8.9Q light body G' light body 3.4 is parallel to its −
Its circumference: gradually narrows from the AlI part to the central part. Reflection 11\i12.13 is to increase the lighting efficiency of this firefly bone, and it is necessary to gradually widen its width toward the periphery, and in combination with a lens. It is possible to correct the decrease in the amount of peripheral light of the lens when the lens is used.

In another embodiment of the invention shown in Figures 1 and 4,
In addition to the reflective surface 12.1'3 like r+, the width of the phosphor 3.4 also gradually increases from the center to the periphery, and together with the reflective surface 12.13, The aim is to create a synergistic effect in correcting vertical decline in ambient light.

Further, as shown in 41sl'Zl, if reflective surfaces 14.15 are also formed on both end surfaces 10.11 of the cover glass 17), the illumination efficiency can be further increased. 3.4 and slit portion 2) A reflective surface can also be formed in the remaining portion.Each reflective surface 1.
;j. Highly reflective gold plate or foil may be molded and attached. 1. Al, Ag
%' reflective film may be directly formed.

In this invention, in order to improve lighting efficiency, /
4>At least both sides of the cover glass 8.9 or,
B+1- It is necessary to provide a reflective surface on the plate glass 11.
, a decrease in the amount of peripheral light Q) can be corrected by the shape of the reflective surface 12.13, etc., and the shape of the phosphor 3.4 and the slit portion 2. In other words, as shown in Figure 4, the width of the buttock body 3.40 is gradually widened from the center to the periphery, or the width of the buttock body 3.40 is gradually widened from the center to the h side. Make it wider. In the case of the after name, Togi, Light Body 3
．． 417) In some cases, Shizuku gradually becomes more lea from the center to the 1st side.
；Z full The wide slits on the top and bottom make you look beautiful.

f) Hot cathode section in emitting 11, light tube rise, I Since it is used for σ lid 1, some of its uses 11 will be explained next. Spear 6 (ge,
Hot cathode fluorescence "j;f L 'a = 7 Mini 7 Ackun Militar Cobia etc. The scanner section 11 used in the illumination system is shown, and the original 18 fed by the feed rollers 16 and 17 is exposed to the heat shade (evening light). The reflected light from the Hara/Ichi 18 is transmitted to the CCD or P by the mirror 19 and the imaging lens 20.
DA, etc.) 1 Image is formed on the image sensor 21 (L, . . . , and the document 18 is read).

?・Another 1+ll shown in Figure 7 is the contact glass 22.
A stationary document 18 placed on top is illuminated with fluorescent light yL, which is moved by a mirror 19 that moves at a speed V and an inner angle mirror 23 that moves debris 1 in the same direction at a speed V/2. An image is formed on an image sensor 21 by an image lens 20.

】・The image shown in Figure 8 is an example of a scanner using a 7-magnification imaging device and a 1-magnification sensor.
is illuminated with fluorescent light t-L, and its reflected light image is formed on a 1-magnification image sensor 28 by an imaging device 27 consisting of a right-angle mirror 24 for path splitting, a lens array 25, and a roof mirror array 126. Ru. The details of such a canned image device are described in Japanese Patent Laid-Open Publication No. 57-37326.

Still another example, shown in FIG. 9, is an application of a 1-magnification optical system such as the above-mentioned optical system to a copying machine, in which a 1-magnification image processor 29 is used instead of a 1-magnification image processor.

Electrophotographic W-light body 290 moves in the same direction as the original 18
The surface is charged in advance to a predetermined polarity, and an image of the document 18 illuminated with fluorescent light is projected thereon through an imager 27. As a result, the charged particles on the F light body 29 are selectively destroyed, and an electrostatic latent image corresponding to the original image is formed there, and this is printed with colored copying particles called toner. 7. Obtain the statue of the ruler.

The cross-sectional shape of the hot cathode fluorescent tube L17' in each of the above embodiments is rectangular, but other shapes are also possible.
It may also have a diamond shape as shown in the figure. wealth/
In the imaging optical system shown in FIG.
Reflective surfaces are formed on all surfaces except for the phosphors 3 and 4, and by increasing the width of the slit section spanning the phosphors 3 and 4, a 7-etheinog correction is performed. A region of L 11ji, 1, 1, and 18, which is illuminated by a small optical distance L, is uniformly imaged by a convergent light transmitting array 301C on a 1-magnification image processor 28-H.

(Effects of the Invention) As described above, according to the innovative illumination device of the present invention, it is possible to use a hot cathode fluorescent tube that is compact and consumes less electricity, and to increase its illumination power. Therefore, it is possible to utilize a practical document illumination device. Also,
The surrounding light due to the effects of the cos fourth law and aperture efficiency can be increased, so even when used in combination with a normal spherical imaging lens, the peripheral light due to the effects of the fourth power law and aperture efficiency: The decrease can be effectively corrected. Furthermore, even when used in combination with an imaging optical system such as a roof mirror lens array or a converging light transmitting body array, it is possible to correct the light intensity drop at the light emitting end face, etc.

[Brief explanation of the drawing]

Figure 1.1 shows a conventional slit-type hot cathode fluorescent tube +7')
-Example: paulownia tree, schematic plan view, 2 Figure 1, base: ifr
The top view, Figures 1 and 3 to Figure 5 are heat 1 (partial development view of the polar fluorescent tube, Figure 3□ and Figure 6) in Embodiment 1 of this invention.
FIGS. 10A and 10B are schematic diagrams showing different examples of the original reading optical system to which the present invention is applied. Note that the hunting in Figures 1 and 1 and Figures 3 to 5 is for the purpose of making the figures easier to understand, and does not represent a cross section. L: Slit type hot cathode fluorescent tube, 1: Curtain plate glass. 2... Slit part, 3.4... Fluorescent material, 5, 6...
・Fil person for releasing Netsuichiko, 7...Cover glass,
12゜13, 14. 15... Reflective surface/Method e. Ink 7 figure

Claims (1)

[Scope of Claims] 1. Fluorescent materials arranged in two rows with an IJ throat section provided between them inside a relatively long sealed glass tube, and a filament for thermoelectron emission stretched over the fluorescent materials. 1. A hot cathode fluorescent back type document illuminating device comprising: a reflective surface provided inside the sealed glass tube. 2. A patent claim characterized in that the width of the reflective surface and/or the slit portion spanning the phosphor gradually increases from the center to the periphery along the longitudinal direction of the phosphor. 9; Document illumination device as described in box 1.1.