CN103716496A - Linear lighting device and light source device - Google Patents
Linear lighting device and light source device Download PDFInfo
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- CN103716496A CN103716496A CN201310459387.2A CN201310459387A CN103716496A CN 103716496 A CN103716496 A CN 103716496A CN 201310459387 A CN201310459387 A CN 201310459387A CN 103716496 A CN103716496 A CN 103716496A
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Abstract
The invention provides a linear lighting device and a light source device, capable of forming lighting area with high and uniform illumination on an auxiliary scanning direction. The linear lighting device comprises a rod-shaped light guide made of transparent material, and LED elements arranged opposite to the end face on the length direction of the light guide, wherein the light guide has a reflection portion formed on the external surface of the light guide along the length direction. The reflection portion is formed by a plurality of inward recessed portions arranged to reflecting the light of the LED elements and emitting light from the light emitting surface extending from the length direction of the light guide. A diffusion reflecting surface is arranged on the back of the light guide on the opposite side of the light emitting surface on the external surface of the light guide to reflect light emitted from the back of the light guide and allow the light entering into the back of the light guide. The linear lighting device is characterized in that a peripheral protruding portion protruding outward is formed on the periphery of each recessed portion.
Description
Technical field
The original copy that the present invention relates to use in the equipment such as facsimile machine, photocopier and scanner reads with line illuminator and light supply apparatus.
Background technology
The equipment such as facsimile machine, photocopier and scanner have original document reading apparatus, this original document reading apparatus, according to read word, the image information of master copy from the reverberation of master copy, carries the light supply apparatus for master copy is thrown light in this original document reading apparatus.
At this original copy, read with in light supply apparatus, the light supply apparatus that needs the high illumination field of illumination that a kind of width that can form sub scanning direction is large, as such light supply apparatus, following light supply apparatus is now proposed: possess and at one end configured the bar-shaped light guide of LED element and the first speculum and the second speculum configuring side by side with this light conductor, light conductor has the light from LED element to the first reflecting part of original copy mounting surface reflection and the second reflecting part (with reference to patent documentation 1) that the light from LED element is reflected to the second speculum.
Figure 16 means the key diagram of the structure of the light conductor in the existing light supply apparatus carrying in original document reading apparatus.In this light conductor 80, along the length direction formation light-emitting face 81 of this light conductor 80, the circumferential profile of the section that the length direction with light conductor 80 of light-emitting face 81 is vertical is circular-arc.At the relative side face of light-emitting face 81 with light conductor 80, with state outstanding on the radial direction at light conductor 80, along the length direction of this light conductor 80, form the first reflecting part 82, this first reflecting part 82 reflects the light from LED element 86 to original copy mounting surface (omitting diagram), and, the position separated with this first reflecting part 82 making progress in the week of light conductor 80, with state outstanding on the radial direction at light conductor 80, along the length direction of this light conductor 80, form the second reflecting part 83, this second reflecting part 83 reflects the light from LED element 86 to speculum (omitting diagram).In addition, between the light-emitting face 81 of light conductor 80 and the first reflecting part 82, be formed with the projecting strip part 85 for maintenance extending on the length direction of light conductor 80.87 for being configured to surround an end face of light conductor 80 and the speculum in the space between LED element 86.
Yet, in above-mentioned light supply apparatus, the first reflecting part 82 and the second reflecting part 83 in light conductor 80 form state outstanding on radial direction, light conductor 80 integral body are complicated shape, therefore the manufacturing cost of light conductor 80 itself is high, and owing to having used two speculums, so there is the problem that the manufacturing cost of light supply apparatus is high.
In order to address this problem, inventor of the present invention is to using for example columned light conductor of simple shape and using the light supply apparatus of a speculum to be studied.
As shown in figure 17, this light supply apparatus possesses: the bar-shaped light guide 90 consisting of translucent material; The LED element (omitting diagram) relatively configuring with the end face of these light conductor 90 length directions; And the speculum 20 configuring side by side with light conductor 90, the light from this light conductor 90 is reflected to original copy mounting surface 1.In addition, in Figure 17,2 represent original copy, and 5 represent original copy mounting table.
And, as light conductor 90, as shown in Figure 18 and Figure 19, use the rectangular columned light conductor with two row recess row, this recess is listed as by the depressed part 92H, the 93H(that arrange along its length a plurality of depressions to the inside with reference to Figure 19) and form.In this light conductor 90, a side of recess row is used as the first reflecting part 92 and is set to the light from LED element to reflect to original copy mounting surface 1, and opposite side is used as the second reflecting part 93 and is set to the light from LED element to speculum 20 reflections.
But, now known when using such light conductor 90 to form light supply apparatus, be difficult to form Illumination Distribution (below also referred to as " section the lighting ") field of illumination that uniformity is high of the sub scanning direction of original copy mounting surface 1.Below, for this problem, describe particularly.
In above-mentioned light supply apparatus, the light of injecting light conductor 90 from LED element penetrates to original copy mounting table 1 from the light-emitting face 91 of light conductor 90 by the first reflecting part 92, and to speculum 20, penetrate from the light-emitting face 91 of light guide plate 90 by the second reflecting part 93, and the light penetrating to speculum 20 reflects to original copy mounting surface 1 by this speculum 20.And in original copy mounting surface 1, from the first reflecting part 92, shine directly into field of illumination (below also referred to as " directly optical illumination region ") that light original copy mounting surface 1 (below also referred to as " directly light ") throws light on and by speculum 20, be irradiated to its part of field of illumination (below also referred to as " indirect light field of illumination ") that the light (below also referred to as " indirect light ") original copy mounting surface 1 throws light on from the second reflecting part 92 of light conductor 90 and overlap each other and form, thus, in this original copy mounting surface 1, be formed on the high illumination of the band shape of extending on main scanning direction field of illumination.
Yet, as shown in figure 20, the high illumination field of illumination being formed by above-mentioned light supply apparatus, the shape that the section lighting c of the overlapping synthetic light obtaining of section lighting b of the section lighting a of direct light and indirect light is presented to the lower such chevron of larger its illumination of distance at the center (original copy reads axle Y) apart from section, cannot form the high high illumination field of illumination of section cloth optical uniformity of expection.
The reason that such problem occurs is speculated as follows:, by the recess 92H of light conductor 90, the light that 93H reflects respectively, first by each reflecting part 92,93 optically focused to certain direction, and, also scioptics effect and optically focused in the light-emitting face 91 of this light conductor 90.Consequently, can expect that direct light and indirect light all become the light in original copy mounting surface 1 with precipitous illumination peak value.
As means that solve such problem, for example, consider to increase the means of the distance between light conductor and diffusely reflecting surface.
For example, as shown in figure 17, in above-mentioned light supply apparatus, light conductor 90 is kept platform 45 keep and fix towards the state of predetermined direction by light conductor with the light-emitting face 91 of light conductor 90.Particularly, in light conductor keeps platform 45, with section be circular light conductor 90 form fit form the drilled maintenance recess that leads to into tubbiness,, the integral body of light conductor 90 is embedded in the maintenance recess that light conductor keeps platform 45.And the surface of this maintenance recess is the diffusely reflecting surface 18 that makes light scattered reflection.By this diffusely reflecting surface 18, make light that the light conductor back sides from the outer surface of light conductor 90 and light-emitting face 91 opposition sides penetrate, with the state of scattered reflection, again incide this light conductor back side and be used, therefore can improve section cloth uniformity of light.
And the distance between this light conductor 90 and diffusely reflecting surface 18 is larger, can make the more diffusion of reflection of light direction penetrated from the light conductor back side, thereby it is better to make to improve the inhomogeneity effect of section lighting.
But, when distance between light conductor and diffusely reflecting surface is large, can cause the increase of product size, not therefore preferred.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2011-182370 communique
Summary of the invention
The present invention is based on above situation and make, object is to provide a kind of line illuminator, can form the high high illumination field of illumination of illuminance uniformity on sub scanning direction.
In addition, other object of the present invention is, a kind of light supply apparatus is provided, and in the light supply apparatus using, forms the high high illumination field of illumination of illuminance uniformity on sub scanning direction at the catoptrical original document reading apparatus reading from original copy.
Line illuminator of the present invention, possesses the bar-shaped light conductor being formed by translucent material, and the LED element relatively configuring with the end face of the length direction of this light conductor, above-mentioned light conductor has the reflecting part forming along its length on the outer surface of this light conductor, this reflecting part a plurality ofly reflects and light-emitting face that described light extends from length direction along this light conductor is penetrated the light from above-mentioned LED element by arranging, the recess of depression and the recess row that form form to the inside, with the light conductor back side in the contrary side of light-emitting face in the outer surface of above-mentioned light conductor relatively, the light being provided with penetrating from this light conductor back side reflects and makes described light inject the diffusely reflecting surface at this light conductor back side, described line illuminator is characterised in that, at above-mentioned recess circumference separately, form outstanding laterally peripheral projection portion.
In line illuminator of the present invention, top and the above-mentioned diffusely reflecting surface butt of preferred above-mentioned peripheral projection portion.
The original document reading apparatus of light supply apparatus of the present invention for the original copy reverberation from original copy is read, this light supply apparatus possesses: bar-shaped light conductor, consists of translucent material; LED element, relatively configures with the end face of the length direction of this light conductor; and speculum, configure side by side with above-mentioned light conductor, light from this light conductor is reflected to original copy mounting surface, above-mentioned light conductor has the first reflecting part that forms and the light from above-mentioned LED element is reflected to above-mentioned original copy mounting surface along its length on the outer surface of this light conductor, and on the outer surface of this light conductor, form along its length and the second reflecting part to above-mentioned speculum reflection by the light from above-mentioned LED element, the recess row that at least one party in above-mentioned the first reflecting part and above-mentioned the second reflecting part forms by arranging the recess of a plurality of depressions to the inside form, with the light conductor back side in the contrary side of light-emitting face penetrating for light towards above-mentioned original copy mounting surface or above-mentioned speculum in the outer surface of above-mentioned light conductor relatively, be provided with diffusely reflecting surface, this scattered reflection is in the face of reflecting and make described light inject this light conductor back side from the light of this light conductor back side ejaculation, described light supply apparatus is characterised in that, at above-mentioned recess circumference separately, form outstanding laterally peripheral projection portion.
In light supply apparatus of the present invention, top and the above-mentioned diffusely reflecting surface butt of preferred above-mentioned peripheral projection portion.
According to line illuminator of the present invention and light supply apparatus, at the circumference that forms the recess of reflecting part, peripheral projection portion is set, light the light therefore penetrating from the light conductor back side to outside, that penetrate by this peripheral projection portion is refracted rear ejaculation thus.Therefore, in diffusely reflecting surface, do not compare with there is no the situation of peripheral projection portion, the region of irradiating light expands, and has therefore increased the diffusion effect of the light of recycling after reflecting by diffusely reflecting surface.Consequently, needn't increase the separating distance between light conductor and diffusely reflecting surface, just can form the high high illumination field of illumination of illuminance uniformity on sub scanning direction.
Accompanying drawing explanation
Fig. 1 means the vertical view of the structure of an example of carrying the light supply apparatus of the present invention in original document reading apparatus.
Fig. 2 is the X-X line cutaway view of the light supply apparatus shown in Fig. 1.
Fig. 3 means the vertical view of the light conductor in the light supply apparatus shown in Fig. 1.
Fig. 4 means the cutaway view of in the longitudinal direction light conductor in the light supply apparatus shown in Fig. 1 being analysed and observe.
Fig. 5 is the surperficial partial top view of the light conductor shown in Watch with magnifier diagram 3.
Fig. 6 is the explanation cutaway view of the part of the dotted line M in the light conductor shown in Watch with magnifier diagram 2.
Fig. 7 means in the longitudinal direction the amplification view that the light conductor in the light supply apparatus shown in Fig. 1 and diffusely reflecting surface are analysed and observe.
Fig. 8 (a) is the schematic diagram that the light path of the light penetrating from the light supply apparatus shown in Fig. 1 is described, Fig. 8 (b) is that explanation is from the schematic diagram of the light path of the light of the light supply apparatus ejaculation shown in Figure 17.
Fig. 9 means the vertical view of the light conductor in other examples of light supply apparatus of the present invention.
Figure 10 is the surperficial vertical view of the light conductor shown in Watch with magnifier diagram 9.
Figure 11 (a) is the cutaway view of in the direction perpendicular to length direction, the light conductor in the light supply apparatus of other examples of the present invention being analysed and observe, and Figure 11 (b) amplifies the explanation cutaway view that represents reflecting part.
Figure 12 means in the longitudinal direction the cutaway view that the light conductor in the light supply apparatus of another other examples of the present invention and diffusely reflecting surface are analysed and observe.
Figure 13 means the curve chart of the shape of recess in the light conductor of the related light supply apparatus of embodiment 1 (A) and peripheral projection portion.
Figure 14 means the curve chart of Illumination Distribution of the sub scanning direction in original copy mounting surface of the related light supply apparatus of embodiment 1 (A).
Figure 15 means the curve chart of Illumination Distribution of the sub scanning direction in original copy mounting surface of the related light supply apparatus of embodiment 2 (B).
Figure 16 means the key diagram of structure of the light conductor of an example of carrying the existing light supply apparatus in original document reading apparatus.
Figure 17 means the explanation cutaway view of another routine structure of carrying the existing light supply apparatus in original document reading apparatus.
Figure 18 means the stereogram of the light conductor in the light supply apparatus shown in Figure 17.
Figure 19 is the explanation cutaway view of part of the dotted line Q of the light conductor shown in Watch with magnifier diagram 17.
Figure 20 means the curve chart of the Illumination Distribution of the sub scanning direction of the light supply apparatus shown in Figure 17 in original copy mounting surface.
Embodiment
Below, to being assembled with the execution mode of the light supply apparatus of line illuminator of the present invention, describe.
Fig. 1 means the vertical view of the structure of an example of carrying the light supply apparatus of the present invention in original document reading apparatus, Fig. 2 is the X-X line cutaway view of the light supply apparatus shown in Fig. 1, Fig. 3 means the vertical view of the light conductor in the light supply apparatus shown in Fig. 1, Fig. 4 means the cutaway view of in the longitudinal direction light conductor in the light supply apparatus shown in Fig. 1 being analysed and observe, and Fig. 5 is the surperficial partial top view of the light conductor shown in Watch with magnifier diagram 3.
This light supply apparatus has: bar-shaped light conductor 10, be configured to be configured in original document reading apparatus mounting original copy 2 the document board with light transmission 5 below and along the parallel plane of original copy mounting surface 1 with document board 5, on main scanning direction, extend; And the tabular speculum 20 of elongated rectangular shape, be configured to read axle Y and the state arranged discretely with this light conductor 10 via the original copy vertical with original copy mounting surface 1 on sub scanning direction.
In the present invention, so-called " sub scanning direction " means moving direction when light supply apparatus is relatively moved with respect to original copy mounting surface 1, so-called " main scanning direction " means the direction vertical with sub scanning direction, is the direction parallel with original copy mounting surface.
As shown in Figure 1, in the relative position of the end face with light conductor 10 (left side in Fig. 1), configure discretely LED element 30 with an end face of this light conductor 10.In addition, in one end of light conductor 10 to surround an end face of this light conductor 10 and the mode in the space between LED element 30 configures speculum 31.In illustrated example, in the other end with light conductor 10, (right side in Fig. 1) relative position also configures LED element 30 discretely with the other end of this light conductor 10, at the other end of this light conductor 10 to surround the other end of this light conductor 10 and the mode in the space between LED element 30 configures speculum 31.
By base 40A, keep and fixing light conductor 10, by base 40B, keep and stationary mirror 20.If specifically described, keep the base 40A of light conductor 10 to there is base station 41A and light conductor maintenance platform 45, it is upper that this light conductor keeps platform 45 to be arranged on this base station 41A, and extend upward in the side identical with light conductor 10.In addition, keep the base 40B of speculum 20 to have base station 41B and speculum maintenance platform 46, this speculum keeps platform 46 to keep platform 45 spread configuration discretely with light conductor on this base station 41B, and extends upward in the side identical with speculum 20.
And with light-emitting face 11, the state towards predetermined direction remains on light conductor maintenance platform 45 and fixes light conductor 10.Particularly, on light conductor 10, be formed with the side face protuberance for location outstanding and that extend at length direction (omitting diagram) from light conductor 10, in light conductor maintenance platform 45, form the maintenance recess and the recess (omitting diagram) with the shape of mating with the protuberance of light conductor 10 for barrel-shaped that drill through mating with the section shape of light conductor 10, at the protuberance of light conductor 10 and light conductor, keep under the chimeric state of the recess of platform 45, the integral body of light conductor 10 keeps by remaining on light conductor being fixed in the maintenance recess of platform 45.
Fixedly the light conductor of light conductor 10 keeps the surface of the maintenance recess of platform 45 to be used as diffusely reflecting surface 18, in the light supply apparatus of this example, by light conductor 10 and the light conductor with diffusely reflecting surface 18, keeps platform 45 to form line illuminator.
This diffusely reflecting surface 18 has following function: make not by recess 12H, 13H to light-emitting face 11 reflections and the light that penetrates from the light conductor back side of light-emitting face 11 opposition sides of the outer surface with light conductor 10, scattered reflection occurs and again incide this light conductor back side.
Ejection formation is in the situation that keep the mask that exposes of recess to have scattered reflection function, and for example at light conductor, keeping platform 45 is by white resin moulding in the situation that, and this diffusely reflecting surface 18 can be also the former state of exposing face.In addition, also can keep the maintenance recess of platform 45 to apply whitewash to light conductor and form diffusely reflecting surface, can also the reflection parts such as scattered reflection sheet material be set at maintenance recess and form diffusely reflecting surface.
With reflecting surface, the state towards predetermined direction remains on speculum maintenance platform 46 speculum 20.In addition, base 40A, 40B separately between, space 44 that original copy reverberation from original copy 2 passes through is formed thus in the mode that keeps platform 45 and speculum to keep platform 46 to extend at equidirectional with light conductor, and the CCD that is for example configured in the below of light supply apparatus from the reverberation of original copy 2 receives.In addition, on the base station 41A in base 40A, dispose for the distribution 32 to 30 power supplies of LED element.In addition, in Fig. 1,50 represent the radiator for the heating of LED element 30 is dispelled the heat.
The contour shape that light conductor 10 for example can be made the section vertical with its length direction is circular shape.The region towards original copy mounting surface 1 and speculum 20 in the outer peripheral face of this light conductor 10, along the length direction formation light-emitting face 11 of this light conductor 10.Outer peripheral face and light conductor back side light-emitting face 11 opposition sides at light conductor 10, formation is the first reflecting part 12 to 1 reflection of original copy mounting surface by the light from LED element 30, and, the position separated with the first reflecting part 12 making progress in the week at this light conductor back side, the second reflecting part 13 light from LED element 30 being reflected to speculum 20 along the length direction formation of this light conductor 10.
In the light supply apparatus of this example, the section vertical with the length direction of light conductor 10 is circular, therefore can easily manufacture this light conductor 10.
As shown in Figure 5, the first reflecting part 12 in this example and the second reflecting part 13 consist of recess row respectively, this depression be listed as by the outer surface at light conductor 10 along the length direction of this light conductor 10 arrange and forms, a plurality of recess 12H, 13H that cave in to the inside form. Such recess 12H, 13H is by being used CO
2the laser processing of laser aid and being formed on the outer surface of light conductor 10.
And, in the present invention, as shown in Figure 6, at the circumference separately that forms recess 12H, the 13H of the first reflecting part 12 and the second reflecting part 13, be formed with this recess 12H, the 13H continuum of states outstanding 12P of peripheral projection portion, 13P laterally.The such 12P of peripheral projection portion, 13P by use CO2 laser aid laser processing or with heating after the butts such as blade heating and melting processing and on the outer surface of light conductor 10, form with recess 12H, 13H simultaneously or after forming recess 12H, 13H.
As the size example that forms recess 12H, the 13H of the first reflecting part 12 and the second reflecting part 13, the depth d of recess 12H, 13H is 0.05mm, the width s of the length direction of light conductor 10 is 0.2mm, recess 13H spacing is in the longitudinal direction 0.4-0.6mm, and recess 12H spacing is in the longitudinal direction 0.7-1.0mm.
In addition, as the size example of the 12P of peripheral projection portion, 13P, width t is 0.05mm, and height h is 0.02mm.
In the light supply apparatus of this example, top and the distance k between diffusely reflecting surface 18 that separating distance shown in Fig. 7, between light conductor 10 and diffusely reflecting surface 18 is the 12P of peripheral projection portion, 13P in light conductor 10 are for example 0.2mm.
This is larger apart from k, uses the light diffuser efficiency of diffusely reflecting surface 18 higher.
As LED element 30, can use White LED element.
In addition, as forming the base station 41A in base 40A, 40B, the material of 41B, can use the metal materials such as aluminium, as forming light conductor, keep platform 45 and speculum to keep the material of platform 46 can use the resin materials such as the metal materials such as aluminium, polycarbonate resin.
In such light supply apparatus, the light radiating from LED element 30 is reflected mirror 31 reflections and guides to light conductor 10, and from the surface feeding sputtering of light conductor 10 to light conductor 10, by this light conductor 10, on the length direction of this light conductor 10, is guided.
As shown in Figure 8, on the length direction of light conductor 10, a part for directed light reflects by forming recess 12H, the 13H of the first reflecting part 12 and the second reflecting part 13 respectively, and penetrates from the light-emitting face 11 of light conductor 10.
On the other hand, on the length direction of light conductor 10, another part of directed light does not reflect to light-emitting face 11 by recess 12H, 13H, and from the light conductor back side, penetrate and arrive diffusely reflecting surface 18, there is scattered reflection and again incide light conductor 10 from the light conductor back side, by this light conductor 10 and from light-emitting face 11, penetrating.
Light the light penetrating from light-emitting face 11, that penetrate from the related region of the first reflecting part 12 (directly light) is irradiated to the one side of the original copy 2 loading in document board 5, and the light penetrating from the related region of the second reflecting part 13 is reflected mirror 20 reflections, and this reverberation (indirect light) is irradiated to the one side of the original copy 2 loading on document board 5.
And, in the one side of original copy 2, by the light from the first reflecting part 12, form direct optical illumination region, and form indirect light field of illumination by the reverberation from speculum 20.And, by a part separately for direct optical illumination region and indirect light field of illumination is overlapped each other, be formed on the high illumination of the band shape of extending on main scanning direction field of illumination.
Thus, light from the light that the light conductor back side is penetrated, by the 12P of peripheral projection portion, 13P is reflected by the 12P of this peripheral projection portion, 13P, and state little with the formed angle in the light conductor back side with light conductor 10 and that diffusion occurs penetrates (with reference to the arrow d of Fig. 8) from the light conductor back side.Therefore, in diffusely reflecting surface 18, irradiated the region D of light
1with the region D that there is no the situation of the 12P of peripheral projection portion, 13P
2compare expansion, therefore improved the diffusion effect of the light that is diffused reflecting surface 18 reflections and is again utilized.Consequently, needn't increase the separating distance between light conductor 10 and diffusely reflecting surface 18, just can form the high high illumination field of illumination of illuminance uniformity on sub scanning direction.
According to above-mentioned light supply apparatus, the 12P of peripheral projection portion, 13P are set, thereby make to inject to from the light conductor back side light outside light, by the 12P of this peripheral projection portion, 13P with by the 12P of this peripheral projection portion, 13P reflects and the state that spreads penetrates.Therefore, the region of irradiating light in this diffusely reflecting surface 18 is compared extended with the situation that there is no the 12P of peripheral projection portion, 13P, has therefore improved the diffusion effect of the light that is diffused reflecting surface 18 reflections and again utilizes.Consequently, needn't increase the separating distance between light conductor 10 and diffusely reflecting surface 18, just can form the high high illumination field of illumination of illuminance uniformity on sub scanning direction.
Above, embodiments of the present invention are illustrated, still, the invention is not restricted to above-mentioned execution mode, can apply various changes.
For example, the recess of formation the first reflecting part and the second reflecting part is not limited to roughly positive circular.In addition, peripheral projection portion be not limited to form spread all over all-round.
Particularly, as shown in Figure 9 and Figure 10, be formed in the first reflecting part 22 that the outer surface of light conductor 21 forms and each recess 22H, the 23H of the second reflecting part 23, for the inner side depression to light conductor 21 and along the ellipse of the circumferential extension of light conductor 21.
In addition, this recess 22H, 23H only with recess 22H, 23H circumference separately in, along under the edge continuum of states of circumferentially extending, the 22P of peripheral projection portion, 23P form in the outstanding mode of the radial direction along light conductor 21.And edge in recess 22H, 23H circumference separately, that extend along the length direction of light conductor 21, only forms very little jut or does not form jut.
In the light supply apparatus of this example, size example as recess 22H, 23H, the degree of depth of recess 22H, 23H is 0.05mm, the width v1 of the recess 22H of the first reflecting part 22 on the length direction of light conductor 21 is 0.2mm, circumferential width w1 is 1.3mm, the width v2 of the recess 23H of the second reflecting part 23 on the length direction of light conductor 21 is 0.2mm, circumferential width w2 is 0.8mm, recess 23H spacing is in the longitudinal direction 0.4-0.6mm, and recess 22H spacing is in the longitudinal direction 0.7-1.0mm.
In addition, as the size example of the 22P of peripheral projection portion, 23P, Breadth Maximum u is 0.05mm, is highly 0.02mm.
By using CO
2the laser processing of laser aid, such recess 22H, 23H and the 22P of peripheral projection portion, 23P can be formed on the outer surface of light conductor 10.
Particularly, on the linear module that can move along the direction X of level, so that being the consistent mode of level and the length direction of light conductor 21 and the moving direction of linear module, the length direction of light conductor 21 loads light conductor 21.
CO is set directly over linear module
2laser.
Then, linear module is moved along direction X, thereby can select position on the length direction of light conductor 21, that should form recess 22H, 23H and the 22P of peripheral projection portion, 23P.On the other hand, make CO
2move the some position of laser, thereby can select the position that make progress in week, that should form recess 22H, 23H and the 22P of peripheral projection portion, 23P of light conductor 21.
In addition, can pass through CO
2width v1, v2 that the length direction of recess 22H, 23H is determined in the some footpath of laser, can pass through CO
2the displacement of the some position of laser is determined circumferential width w1, the w2 of recess 22H, 23H.Can pass through CO
2the degree of depth of power determination recess 22H, the 23H of laser and the Breadth Maximum u of the 22P of peripheral projection portion, 23P.
The Ear Mucosa Treated by He Ne Laser Irradiation operation that is used to form a recess 23H and the 23P of peripheral projection portion is as follows.
First, light conductor 21 is being loaded under the state on linear module, linear module is moved along direction X, determining position on the length direction of light conductor 21, that should form recess 23H and the 23P of peripheral projection portion.
Then, making power 20W, optically focused is the CO that some footpath is about φ 0.1mm
2laser illumination, on light conductor 21, makes CO
2laser be take speed that a position is 1000mm/s along the circumferential mobile 0.75mm of light conductor 21 and is irradiated.
Thus, forming recess 23H, is the linearity of the circumferential extension along light conductor 21, in the length making progress in the week of light conductor 21, is 0.8mm, width on the length direction of light conductor 21 be 0.2mm(as comprise the 23P of peripheral projection portion width be 0.3mm), the degree of depth is 0.05mm.
By carrying out such Ear Mucosa Treated by He Ne Laser Irradiation operation, at the circumference of recess 23H, form the 23P of peripheral projection portion simultaneously.The 23P of peripheral projection portion only forms with this recess 23H with the long edge continuum of states of circumferential extension along light conductor 21, to the outstanding jut of the radial direction of light conductor 21.The edge of extending at the length direction along light conductor 21, only forms the jut of the very little formation peripheral projection 23P of portion, or does not form jut completely.
Make linear module move and change the Working position on the length direction of light conductor 21 and repeatedly carry out above-mentioned such Ear Mucosa Treated by He Ne Laser Irradiation operation along direction X, thereby form the second reflecting part 23 that penetrates indirect light.
In addition, change CO
2the point position of laser and change the position on the direction X of linear module and repeatedly carry out above-mentioned such Ear Mucosa Treated by He Ne Laser Irradiation operation, thus the first reflecting part 22 that penetrates direct light formed.
In addition, for example, LED element 30 also can only be configured in the distolateral of light conductor 10, and in such structure, the other end of light conductor 10 also can dispose the light diffusion reflector that the light from LED element 30 is carried out to scattered reflection.
As light diffusion reflector, can use the material that contains titanium oxide, calcium carbonate, bead etc. in the resins such as polyethylene terephthalate (PET), Merlon (PC).
In addition, for example, light conductor is not limited to the contour shape of the section vertical with its length direction for circular.
Particularly, for example, as shown in figure 11, can be also the light conductor 80 using as existing light supply apparatus, form the first reflecting part 72 and the second reflecting part 73 to the outstanding form in the outside of radial direction and the whole light conductor 70 with the structure of complicated shape.
In this light conductor 70, along its length direction, form light-emitting face 71, the circumferential profile in the section vertical with length direction of this light-emitting face 71 is circular-arc.The periphery relative with light-emitting face 71 at light conductor 70, with the outstanding state of the radial direction to light conductor 70, along the length direction of light conductor 70, form and make the first reflecting part 72 to the reflection of original copy mounting surface from the light of LED element, and, the position separated with this first reflecting part 72 making progress in the week of light conductor 70, forms and makes the second reflecting part 73 to speculum reflection from the light of LED element along the length direction of this light conductor 70 with the outstanding state of the radial direction to light conductor 70.In addition, between the light-emitting face 71 of light conductor 70 and the first reflecting part 72, be formed on the projecting strip part 75 for maintenance extending on the length direction of light conductor 70.
The first reflecting part 72 and the second reflecting part 73 consist of recess row respectively, and this recess be listed as and by the outer surface at this first reflecting part 72 and the second reflecting part 73, forms a plurality of recess 72H, the 73H that cave in to the inside that arrange on the length direction of light conductor 70 and form.And, at this recess 72H, 73H circumference separately to be formed with laterally the outstanding 72P of peripheral projection portion, 73P with this recess 72H, 73H continuum of states.
In addition, for example as shown in figure 12, the top of the 12P of peripheral projection portion, 13P also can with diffusely reflecting surface 18 butts.
In the situation that the temperature of the material of light conductor 10 basis such as propylene etc. or the variation of humidity are expanded or shrink, light conductor 10 and light conductor keep separating distance Yin Wendu in the longitudinal direction of platform 45 or damp condition and non-constant, cause sometimes the illuminance uniformity step-down of the main scanning direction in high illumination field of illumination.
Yet, by in a manner described the 12P of peripheral projection portion, 13P being used as to isolation part, light conductor 10 and light conductor keep the separating distance between platform 45 have nothing to do and remain constant with humidity or temperature conditions, therefore, can form the high high illumination field of illumination of illuminance uniformity on major-minor scanning direction.
[embodiment]
Below, specific embodiments of the invention are described, but the invention is not restricted to this.
[embodiment 1]
Use White LED element as LED element, according to the light supply apparatus (A) of structure shown in following condition construction drawing 1.
The material of light conductor is propylene resin, and total length is 340mm, and diameter is 5mm, and the distance that the central shaft of the light conductor horizontal direction (sub scanning direction) reads axle to original copy is 6.2mm.
The first reflecting part in light conductor and the second reflecting part consist of a plurality of recesses of arranging on the length direction of this light conductor.The degree of depth of these recesses is 0.05mm, width on light conductor 10 length directions is that 0.2mm(is 0.3mm while comprising peripheral projection portion), in indirect light side, the recess spacing of length direction is 0.4-0.6mm, in direct light side, the recess spacing of length direction is 0.7-1.0mm.
Peripheral projection portion in light conductor and the periphery of each recess form continuously, and in direct light side, width (t) is 0.05mm, and highly (h) is 0.02mm, and in indirect light side, width (t) is 0.05mm, and highly (h) is 0.02mm.The curve chart of shape that represents the section of recess and peripheral projection portion with Figure 13.
Speculum is rectangular rectangular plate shape level crossing, it is of a size of 10mm * 340mm in length and breadth, with respect to the horizontal plane the angle of inclination of (original copy mounting surface) is 60 °, and the central part of the light conductor horizontal direction (sub scanning direction) is 14.2mm to the distance of speculum.
According to this light supply apparatus (A), from the central shaft of light conductor, to the original copy mounting surface apart from 12mm, irradiate light in vertical direction, measure the Illumination Distribution on sub scanning direction.Its result as shown in figure 14.
Herein, in the section of the length direction perpendicular to light conductor, optical axis from the light of the first reflecting part (directly light) is positioned at the position of reading the separated 0mm in axle Y-direction leaded light side (refraction that comprises thickness of glass 3mm) from original copy with the intersection point of original copy mounting surface, from formed angle between the optical axis of the light of the first reflecting part and original copy mounting surface, is 60 °.In addition, the optical axis from the light (indirect light) of speculum is positioned at the position of reading the separated 1.8mm of axle Y-direction speculum side (comprising the refraction of thickness of glass 3mm) from original copy with the intersection point between original copy mounting surface.
[embodiment 2]
Except the height of the related peripheral projection portion of the first reflecting part of the light conductor peripheral projection portion of light side (directly) is 0.035mm, make the light supply apparatus of structure (B) similarly to Example 1, the original copy mounting surface that is 12mm to vertical direction apart from light conductor by this light supply apparatus (B) is irradiated light, measures the Illumination Distribution on sub scanning direction.Its result as shown in figure 15.
Figure 14 means the curve chart of the Illumination Distribution of light from light supply apparatus (A) sub scanning direction in original copy mounting surface, the longitudinal axis is that the original copy in original copy mounting surface is read to illumination on the axle Y relative illumination as 1, transverse axis is apart from original copy, to read the distance of axle Y in original copy mounting surface, a is the Illumination Distribution curve from the light of the first reflecting part of light conductor (directly light), b is the Illumination Distribution curve of the reverberation (from the indirect light of the second reflecting part) from speculum, and c is the Illumination Distribution curve from the whole light of device.
In addition, Figure 15 means the curve chart of the Illumination Distribution of light from light supply apparatus (B) sub scanning direction in original copy mounting surface, the longitudinal axis is that the original copy in original copy mounting surface is read to illumination on the axle Y relative illumination as 1, transverse axis is apart from original copy, to read the distance of axle Y in original copy mounting surface, a is the Illumination Distribution curve from the light of the first reflecting part of light conductor (directly light), b is the Illumination Distribution curve of the reverberation (from the indirect light of the second reflecting part) from speculum, and c is the Illumination Distribution curve from the whole light of device.
According to the result of Figure 14 and Figure 15, can know clearly, according to embodiment 1 and related light supply apparatus (A), (B) of embodiment 2, can access the high high illumination field of illumination of illuminance uniformity on sub scanning direction.
Claims (4)
1. a line illuminator, the LED element that possesses the bar-shaped light conductor that formed by translucent material and relatively configure with the end face of the length direction of this light conductor,
Above-mentioned light conductor has the reflecting part forming along its length on the outer surface of this light conductor, this reflecting part a plurality ofly reflects and makes recess that light-emitting face that described light extends from length direction along this light conductor penetrates, depression to the inside and the recess row that form form the light from above-mentioned LED element by arranging
The light being relatively provided with penetrating from this light conductor back side with the light conductor back side of the contrary side of light-emitting face in the outer surface of above-mentioned light conductor reflects and makes described light inject the diffusely reflecting surface at this light conductor back side, described line illuminator is characterised in that
At above-mentioned recess circumference separately, form outstanding laterally peripheral projection portion.
2. line illuminator according to claim 1, is characterized in that,
Top and the above-mentioned diffusely reflecting surface butt of above-mentioned peripheral projection portion.
3. a light supply apparatus, the original document reading apparatus reading for the original copy reverberation to from original copy,
This light supply apparatus possesses: bar-shaped light conductor, consists of translucent material; LED element, relatively configures with the end face of the length direction of this light conductor; And speculum, configure side by side with above-mentioned light conductor, the light from this light conductor is reflected to original copy mounting surface,
Above-mentioned light conductor has the first reflecting part that forms along its length on the outer surface of this light conductor and the light from above-mentioned LED element is reflected to above-mentioned original copy mounting surface and on the outer surface of this light conductor, forms along its length and the second reflecting part to above-mentioned speculum reflection by the light from above-mentioned LED element
The recess row that at least one party in above-mentioned the first reflecting part and above-mentioned the second reflecting part forms by arranging the recess of a plurality of depressions to the inside form,
Relatively be provided with diffusely reflecting surface with the light conductor back side that makes the contrary side of light-emitting face that light penetrates to above-mentioned original copy mounting surface or above-mentioned speculum in the outer surface of above-mentioned light conductor, this scattered reflection is in the face of reflecting and make described light inject this light conductor back side from the light of this light conductor back side ejaculation, described light supply apparatus is characterised in that
At above-mentioned recess circumference separately, form outstanding laterally peripheral projection portion.
4. light supply apparatus according to claim 3, is characterized in that,
Top and the above-mentioned diffusely reflecting surface butt of above-mentioned peripheral projection portion.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-219021 | 2012-10-01 | ||
| JP2012219021 | 2012-10-01 | ||
| JP2013-164863 | 2013-08-08 | ||
| JP2013164863A JP5780277B2 (en) | 2012-10-01 | 2013-08-08 | Line lighting device and light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103716496A true CN103716496A (en) | 2014-04-09 |
| CN103716496B CN103716496B (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310459387.2A Active CN103716496B (en) | 2012-10-01 | 2013-09-26 | Line illuminator and light supply apparatus |
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| CN (1) | CN103716496B (en) |
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| CN103716496B (en) | 2018-02-16 |
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