CN1801876A - Illumination device and image scanning device - Google Patents
Illumination device and image scanning device Download PDFInfo
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- CN1801876A CN1801876A CN 200510136396 CN200510136396A CN1801876A CN 1801876 A CN1801876 A CN 1801876A CN 200510136396 CN200510136396 CN 200510136396 CN 200510136396 A CN200510136396 A CN 200510136396A CN 1801876 A CN1801876 A CN 1801876A
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- bar
- light guide
- shaped light
- luminescence unit
- lighting device
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Abstract
To provide an illumination device with a short redundant area and to provide an image reading device incorporated with the illumination device. In light directly introduced into a bar-shaped light guide 3 from an end face of the light guide similarly in the conventional manner among light emitted from a blue element 10a located farthest from the bottom 3b of the light guide 3 in a light emitting element of a light emitting unit 10, a redundant area becomes ling as shown in ,(a). However, light transmitting a gap 13 among the light emitted from the blue element 10a is reflected on a rear face of a shielding section 14 to be introduced into the light guide 3 from the surface of a notch 12 as shown in (b). Since reflected light form the shielding section 14 is almost perpendicular, the redundant area becomes very short.
Description
Technical field
The present invention relates to throw light on original copy lighting device and the image read-out (imageing sensor) of this lighting device is installed.
Background technology
In facsimile machine, photocopier, scanning means etc. image read-out is installed, this image read-out comprises: be assembled with the lighting device of the bar-shaped light guide of original copy irradiation Line of light and will converge at lens arra on the linear imaging sensor from the reverberation of original copy.
As patent documentation 1 and shown in Figure 12, the ordinary construction of above-mentioned lighting device is, be in the cross section and embed bar-shaped light guide 101 in the shell 100 of コ font, to import in the bar-shaped light guide from the light of the luminescence unit 102 that is installed on outer casing end end face, and make it to penetrate in the bar-shaped light guide inner total reflection and from above-mentioned exit facet from bar-shaped light guide 101.
As shown in figure 13, in patent documentation 1, the scatter graph 103 that is provided with coating whitewash etc. in the bottom surface of bar-shaped light guide 101 and forms, and be offset trichromatic each light- emitting component 102a, 102b, the 102c that disposes luminescence unit 102 with respect to the normal of drawing from this bottom surface.
In addition, as avoiding the outer structure that comes off from shell of bar-shaped light guide, the end that discloses the luminescence unit of close shell in Fig. 4 of patent documentation 2 is provided with the structure of sticking department, further, in patent documentation 3, disclose, because the influence of heat and between the end of shell and luminescence unit, form the gap, and shell is the structure that the pit shape carries out five equilibrium in the longitudinal direction in order to prevent.
Patent documentation 1: the spy opens flat 6-217084 communique
Patent documentation 2: the spy opens the 2003-281913 communique
Patent documentation 3: the spy opens the 2004-146870 communique
As patent documentation 1, if adopt the formation make trichromatic light-emitting component (element) with respect to the normal skew of drawing from the bar-shaped light guide bottom surface, then the shape of bar-shaped light guide will become flatly, and therefore, the shape of lighting device also can be restricted.
On the other hand, if trichromatic each light-emitting component is disposed along the normal of drawing from the bar-shaped light guide bottom surface, then there is the illustrated problem of Figure 14 and Figure 15.
Figure 14 (a)～(c) incides state diagram in the bar-shaped light guide 101 for explanation from the light of blue light emitting device 102a, red light-emitting component 102b, green luminousing element 102c, light from each light-emitting component just incides the light distribution property that light conductor has 180 ° before, if but on the light conductor of the propylene system of inciding, then according to snell's law, has about 84 ° scope from the angle of emergence of the light of each light-emitting component.
Figure 15 is the chart of the relation of expression main scanning direction (light conductor long axis direction) displacement of above-mentioned each light-emitting component and luminous intensity.As mentioned above, because the light from each light-emitting component equates (about 84 °) towards the angle of emergence in the bar-shaped light guide 101, so light intensity from bar-shaped light guide 101 bottom surfaces than the blue light emitting device 102a of distant positions, equal 5mm as long as be not more than from the incident end face of bar-shaped light guide 101, then it is no more than 80%.Like this, even if monochromatic, if the luminous intensity deficiency, then this part also becomes the redundant area that can not use as light source.
In the prior art, above-mentioned redundant area is very long, and as lighting device, the length that becomes invalid part is very long.In addition, disclosed structure can not address the above problem in patent documentation 2 and the patent documentation 3.
Summary of the invention
In order to solve above-mentioned problem, aspect the present invention the 1st in the described lighting device, the exit facet of bar-shaped light guide exposes and is contained in the shell, at outer casing end luminescence unit is installed simultaneously, light from this luminescence unit imports in the bar-shaped light guide from the bar-shaped light guide end face, make it to penetrate in the bar-shaped light guide inner total reflection and from above-mentioned exit facet, the end of the luminescence unit of close above-mentioned shell is in the exit facet side of bar-shaped light guide, be provided with the shielding part that covers the bar-shaped light guide end, and, on exit facet side end, form breach near the bar-shaped light guide of luminescence unit, by the gap between this breach and the above-mentioned luminescence unit, the light that comes selfluminous cell is in above-mentioned shielding part backside reflection and be directed in the bar-shaped light guide.
In addition, aspect the present invention the 2nd in the described lighting device, the exit facet of bar-shaped light guide exposes and is contained in the shell, at outer casing end luminescence unit is installed simultaneously, light from this luminescence unit imports in the bar-shaped light guide from the bar-shaped light guide end face, make it to penetrate in the bar-shaped light guide inner total reflection and from above-mentioned exit facet, with the luminescence unit opposing end faces of above-mentioned bar-shaped light guide on, at least with from the opposed position of bar-shaped light guide basal surface position light-emitting component farthest, when the light from above-mentioned light-emitting component incides on the bar-shaped light guide, formed the incidence angle dwell portion.
Lighting device of the present invention, particularly very effective when trichromatic each light-emitting component of institute's mounting on the luminescence unit disposes along the normal direction of drawing from the Width center line of bar-shaped light guide bottom surface.
In the described lighting device in above-mentioned the 2nd aspect, when inciding bar-shaped light guide, the light that sends as specific light-emitting component, can consider to use hemispherical concave surface, the cylindric concave surface of half opening, hemispherical concave surface, the cylindric concave surface of half opening, zigzag concave surface, zigzag convex surface or matsurface etc. with the part of incidence angle broadening.
In addition, image read-out of the present invention comprises: the erecting equal-magnification imaging system (lens arra) from the optical convergence of original copy reflection to linear imaging sensor in above-mentioned lighting device and the emergent light that this lighting device is sent.
Here, image read-out is characterised in that above-mentioned erecting equal-magnification imaging system has the depth of focus more than or equal to 1mm, and the uneven illumination of above-mentioned lighting unit in focal depth range is in ± 20%.But it is that the black and white cycle graph of 6lp (line pair: line to the)/mm modulation degree when carrying out the erecting equal-magnification imaging is more than or equal to the scope on 10% the optical axis that focal depth range refers to spatial frequency.
Here, as spatial frequency (amount of fineness of the periodic structure of expression composing images), selecting the black and white cycle graph of 6lp (line pair: line to)/mm, is because its standard that is used for measuring modulation degree for adopting usually.
Above-mentioned modulation degree is the index of expression modulation depth, if the maximum value of the luminous intensity of being modulated is I
Max, minimum value is I
Min, modulation degree (m)=(I then
Max-I
Min)/(I
Max+ I
Min).And, the present invention with modulation degree more than or equal to the scope on 10% the optical axis as focal depth range, be because its can clearly judge boundary value for people, if modulation degree less than 10%, can not clearly be judged.
And in claim 6, the erecting equal-magnification imaging system is the system that has more than or equal to the 1mm depth of focus.Also reading images correctly when at original copy gauffer or folding line being arranged needs depth of focus more than or equal to 1mm, even if also read without barrier during for the centre joint of books, depth of focus is more preferably greater than equaling 1.6mm.
Further, be preferably in and do not have uneven illumination in the focal depth range as far as possible.Among the present invention, above-mentioned illumination inequality is in ± 20%.This be because, if surpass ± 20% then can not carry out the correction of electric property.
As the above-mentioned erecting equal-magnification imaging system that can bring into play above-mentioned characteristic easily, can consider to use a plurality of lens to overlap and in each lens most lenticules be the system of two-dimensional arrangements regularly with prescribed distance, but be not defined in this.
According to the present invention, the redundant area that the lighting device of bar-shaped light guide is installed can shorten.Therefore,, also can obtain the luminous intensity equal, and reduce, to being favourable on the Design of device with the interference of other device with prior art even the length of lighting device shortens.
Description of drawings
Fig. 1 is the profile that is assembled with the image read-out of the lighting device that the present invention relates to.
Fig. 2 is the oblique view of the major part of this lighting device.
Fig. 3 is the exploded perspective view of the major part of this lighting device.
Fig. 4 (a) and the light that (b) sends for the blue light emitting device of lighting device of the present invention incide the key diagram of the state of bar-shaped light guide.
Fig. 5 represents the main scanning direction displacement of each light-emitting component of lighting device of the present invention and the chart of the relation between the luminous intensity.
Fig. 6 is the figure the same with Fig. 4 of another embodiment of expression.
Fig. 7 is the figure the same with Fig. 4 of another embodiment of expression.
Fig. 8 is the oblique view of the light conductor end face of the lighting device of another embodiment of expression.
Fig. 9 represents the main scanning direction displacement of each light-emitting component of lighting device of another embodiment shown in Figure 6 and the chart of the relation between the luminous intensity.
Figure 10 represents the oblique view of light conductor end face of the lighting device of another embodiment again.
Figure 11 (a)～(c) is the present invention figure of the light conductor end face of the lighting device of another embodiment again.
Figure 12 is the oblique view of the lighting device of prior art.
Figure 13 is the oblique view of major part of the lighting device of prior art.
Figure 14 (a)～(c) is the key diagram that the light of blue light emitting device, red light-emitting component and green luminousing element ejaculation incides the state of bar-shaped light guide.
Figure 15 represents the main scanning direction displacement of each light-emitting component of lighting device of prior art and the chart of the relation between the luminous intensity.
Embodiment
With reference to the accompanying drawings embodiment of the present invention is described.Fig. 1 is that profile, Fig. 2 that the image read-out of lighting device of the present invention is installed are the exploded perspective view of the major part of this lighting device for oblique view, Fig. 3 of this lighting device major part.
Image read-out is formed with recess 1a and recess 1b on framework (framework) 1, the upper surface of recess 1a clogs with the transparent roof panels 2 of mounting original copy, the line illuminator 5 that bar-shaped light guide 3 is contained in the shell 4 is fixed in the recess 1a with being tilted, and the substrate 8 that comprises linear imaging sensor (photo-electric conversion element) 6 and drive circuit 7 thereof is installed among the recess 1b of below, further, in framework 1, keeping equimultiple imaging lens arra 9.
And the original copy of mounting on the irradiate light top board 2 that the exit facet of line illuminator 5 penetrates adopts lens arra 9 that its reverberation is incided and is on the imageing sensor 6 of wire arrangement.
The section of the shell 4 of above-mentioned line illuminator 5 is the U font, and the exit facet 3a of bar-shaped light guide 3 is arranged in the opening of shell 4 and embeds wherein.In addition, at an end of shell 4 luminescence unit 10 is installed, in this luminescence unit 10, blue element 10a, red element 10b, green components 10c are uniformly-spaced installed on the normal of drawing from the Width center line of the bottom surface 3b of bar-shaped light guide 3.
In addition, bar-shaped light guide 3 is formed by transparent resin moulding such as propylene, and be configured to: end face is mutually opposed with above-mentioned luminescence unit 10, and at its bottom surface 3b, makes to finish irreflexive scatter graph 11 from the light of above-mentioned surface feeding sputtering and form concavo-convex by the coating whitewash.
In addition, the exit facet 3a side of luminescence unit 10 ends of close bar-shaped light guide 3 forms breach 12, by this breach 12, forms gap 13 between the end face of luminescence unit 10 and bar-shaped light guide 3.If breach 12 can form gap 13, then can be Any shape.For example, the length of light conductor 3 can be shorter than common light conductor, and produce the gap between luminescence unit 10 and light conductor end.
Further, shielding part 14 is arranged to cover above-mentioned breach 12.This shielding part 14 is integrally formed with shell 4, but can be with luminescence unit 10 integrally formed or also can be not integrally formed with luminescence unit 10.Preferably shielding part 14 adopts highly reflective material to form.At least in the shielding part 14, the part that reflects from luminescence unit 10 emitted light is formed high reflectance.For example, metal that can reflectivity is high or white resin etc. are as shielding part 14.
Above, in the light-emitting component of luminescence unit 10, be arranged in the emitted light of blue element 10a, shown in Fig. 4 (a) apart from the bottom surface 3b highest distance position of bar-shaped light guide 3, the same with prior art, the redundant area of the light in directly from the surface feeding sputtering of light conductor 3 to light conductor is elongated.Yet in the emitted light of blue element 10a, shown in Fig. 4 (b), the light by above-mentioned gap 13 incides in the light conductor 3 in the backside reflection of shielding part 14 and from the surface of breach 12.From the reverberation of this shielding part 14 because near vertical, so redundant area is extremely short.
From only photosynthetic by Fig. 4 (a) and Fig. 4 (b) of blue element 10a, so total redundant area shortens.
Fig. 5 represents the main scanning direction displacement of each light-emitting component of lighting device involved in the present invention and the chart of the relation between the luminous intensity, relatively Figure 15 as can be known, the luminous intensity of the blue element 10a at position sharply rises near the light conductor end face near the gap 13, becomes identical with the light intensity levels of remaining red element 10b, green components 10c.Therefore, redundant area length also becomes about half of prior art.
Fig. 6 is the figure the same with Fig. 4 of another embodiment of expression, just in the foregoing description, breach 12 is formed linearity, and among this embodiment, breach 12 is formed curve-like.By breach 12 is formed linearity, can reach balance thereby sample is of all kinds as mentioned above, but by breach 12 is formed curve-like, thereby can control directivity of all kinds.
Fig. 7 also is the figure the same with Fig. 4 of another embodiment of expression, Fig. 8 is the oblique view of the light conductor end face of another embodiment shown in the presentation graphs 7, breach is not set among this embodiment, the end face of bar-shaped light guide 3 is formed tabular surface, and forming hemispherical concave surface 15a as the incidence angle dwell portion that incides the light of bar-shaped light guide with the opposed end face surface of above-mentioned blue element 10a.In addition, as for scatter graph 11, in this embodiment, form the cylindric recess of half opening at bottom surface 3b.
When the part of the light that penetrates from blue element 10a by forming this hemispherical concave surface 15a incides in the light conductor 3 via hemispherical concave surface 15a, reflect laterally and expand.In addition, the redundant area via the light of hemispherical concave surface 15a in directly from the surface feeding sputtering of light conductor 3 to light conductor is very not long, but because the light of incident is almost vertical via above-mentioned hemispherical concave surface 15a, redundant area becomes extremely short so these light are synthesized.
Fig. 9 represents each the light-emitting component main scanning direction displacement of lighting device of another embodiment shown in Figure 6 and the chart of the relation between the luminous intensity.According to this chart, the lighting device that another embodiment relates to is also the same with the foregoing description, and redundant area length becomes about half of prior art.
Figure 10 and Figure 11 are the oblique views of the light conductor end face of the related lighting device of another embodiment of expression, in the embodiment shown in fig. 10, corresponding to blue element 10a, red element 10b, green components 10c, form hemispherical concave surface 15a, 15b, 15c.Especially, in this embodiment, increase, the diameter of hemispherical concave surface 15b is mediated, the diameter minimum of hemispherical concave surface 15c corresponding to the light quantity diameter of the hemispherical concave surface 15a of the blue element 10a of easy deficiency.
Among the embodiment shown in Figure 11 (a), the dwell portion as the incidence angle of the light that incides bar-shaped light guide has formed the cylindric concave surface 15d of half opening, 15e.In addition, not only illustrated is hemispherical concave surface or the cylindric concave surface of half opening, also can form hemispherical convex surface, the cylindric convex surface of half opening or matsurface etc.
Among the embodiment shown in Figure 11 (b),, form zigzag concave surface 15f, 15g, 15h, in the embodiment shown in (c), formed the consecutive concave surface 15f of fine zigzag concave surface, 15g as the incidence angle dwell portion of the light that incides bar-shaped light guide.In addition, can replace the zigzag concave surface with the zigzag convex surface.
Lighting device of the present invention and image read-out are assembled in photocopier, the facsimile machine etc. very effective.
Claims (6)
1. lighting device, the mode that bar-shaped light guide is exposed with its exit facet is contained in the shell, in the end of shell luminescence unit is installed simultaneously, light from this luminescence unit imports in the bar-shaped light guide from the bar-shaped light guide end face, make it to penetrate, it is characterized in that in the bar-shaped light guide inner total reflection and from described exit facet:
In exit facet side near the luminescence unit end bar-shaped light guide of described shell, be provided with the shielding part that covers the bar-shaped light guide end, and, form breach on the exit facet side end of the bar-shaped light guide of close luminescence unit, by the gap between this breach and the described luminescence unit, come the light of selfluminous cell to take place at the described shielding part back side to reflect and be directed in the bar-shaped light guide.
2. lighting device, the mode that bar-shaped light guide is exposed with its exit facet is contained in the shell, at outer casing end luminescence unit is installed simultaneously, light from this luminescence unit imports in the bar-shaped light guide from the bar-shaped light guide end face, make it to penetrate, it is characterized in that in the bar-shaped light guide inner total reflection and from described exit facet:
With the opposed end face of the luminescence unit of described bar-shaped light guide on, at least with from the opposed position of light-emitting component of the bottom surface of bar-shaped light guide highest distance position, formed the part that when the light from described light-emitting component incides bar-shaped light guide, makes the incidence angle broadening.
3. lighting device as claimed in claim 1 or 2, it is characterized in that: on described luminescence unit, trichromatic each light-emitting component is along the normal direction configuration of drawing from the Width center line of bar-shaped light guide bottom surface.
4. as lighting device as described in the claim 2, it is characterized in that: the incidence angle dwell portion was hemispherical concave surface, the cylindric concave surface of half opening, hemispherical convex surface, the cylindric convex surface of half opening, zigzag concave surface, zigzag convex surface or matsurface when the light that described light-emitting component sends incided on the bar-shaped light guide.
5. an image read-out is characterized in that, comprises that claim 1 is to the described lighting device of claim 4 and will converge to the erecting equal-magnification imaging system of linear imaging sensor from the reverberation of original copy from the emergent light that this lighting device penetrates.
6. as image read-out as described in the claim 5, it is characterized in that: described erecting equal-magnification imaging system has the depth of focus more than or equal to 1mm, and the uneven illumination of described lighting unit in focal depth range is in ± 20%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004354878 | 2004-12-08 | ||
| JP2004354878 | 2004-12-08 | ||
| JP2005137732 | 2005-05-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1801876A true CN1801876A (en) | 2006-07-12 |
Family
ID=36811615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510136396 Pending CN1801876A (en) | 2004-12-08 | 2005-12-08 | Illumination device and image scanning device |
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| Country | Link |
|---|---|
| CN (1) | CN1801876A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346274A (en) * | 2010-07-21 | 2012-02-08 | 富士施乐株式会社 | Light guide and image reading apparatus |
| CN102889526A (en) * | 2012-10-19 | 2013-01-23 | 威海华菱光电股份有限公司 | LED (Light-Emitting Diode) rod-like light source for image reading device and manufacturing method |
-
2005
- 2005-12-08 CN CN 200510136396 patent/CN1801876A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346274A (en) * | 2010-07-21 | 2012-02-08 | 富士施乐株式会社 | Light guide and image reading apparatus |
| CN102346274B (en) * | 2010-07-21 | 2015-09-30 | 富士施乐株式会社 | Photoconduction and image read-out |
| CN102889526A (en) * | 2012-10-19 | 2013-01-23 | 威海华菱光电股份有限公司 | LED (Light-Emitting Diode) rod-like light source for image reading device and manufacturing method |
| CN102889526B (en) * | 2012-10-19 | 2015-04-01 | 威海华菱光电股份有限公司 | Manufacturing method for LED (Light-Emitting Diode) rod-like light source for image reading device |
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