CN1758109A - Guide body for surface light device and cutting processing turning tool used by the method - Google Patents
Guide body for surface light device and cutting processing turning tool used by the method Download PDFInfo
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- CN1758109A CN1758109A CN 200510113543 CN200510113543A CN1758109A CN 1758109 A CN1758109 A CN 1758109A CN 200510113543 CN200510113543 CN 200510113543 CN 200510113543 A CN200510113543 A CN 200510113543A CN 1758109 A CN1758109 A CN 1758109A
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Abstract
The present invention provides a surface light source of edge light type capable of sufficiently suppressing generation of a bright band and a dark band and generation of oblique light. In the manufacture of the light guide body for the light source device of the edge light type which guides the light emitted from a primary light source and has a light incident end face where the light emitted from the primary light source enters and a light outgoing face from where the guided light emits, a material of the light guide body 2 made of a translucent synthetic resin is used, and its light incident end face 2c is finished by a cutting process using a bite 12. As the bite, a bite 12 having a relief angle D1 of 3 degrees or more and 4.5 degrees or less, with a rake angle D2 of 3 degrees or more and 8 degrees or less, and curvature radius R at the tip of 1.5 [mu]m or more and 6 [mu]m or less is used. The bite 12 uses as a bonded abrasive grain a sintered polycrystalline diamond particle.
Description
Technical field
The present invention relates to adopt light conductor and the manufacturing thereof used in the planar light source device of end face irradiation mode.In particular, the present invention relates to form the planar light source device that has characteristics in the cut with the opposed light conductor light-incident end of primary source with the manufacture method of light conductor with and cut in the lathe tool that uses.In addition, the present invention also is particularly related to the light conductor that uses in the planar light source device of the obvious degree of seeking to reduce optical defectives such as brightness disproportionation.
Use the planar light source device of light conductor of the present invention for example to be suitable as monitor as portable notebook computer etc., the backlight of the liquid crystal indicator of the display part of liquid crystal TV set and the one-piece type liquid crystal TV set of video etc., the perhaps backlight of the more small-sized liquid crystal indicator that uses as the indicator of the display panel of portable electronic devices such as pocket telephone and various device, the perhaps backlight of the liquid crystal indicator that uses as show the way display board and the billboard of station and communal facility etc., perhaps as the labelling apparatus of the traffic mark of highway and ordinary highway use the backlight of liquid crystal indicator.
Background technology
In recent years, liquid crystal indicator uses as the monitor of portable notebook computer etc. or the display part of liquid crystal TV set, the one-piece type liquid crystal TV set of video, pocket telephone and portable data assistance etc., even is widely used in other various fields.In addition, along with the variation of the increase of information processing capacity, demand and to multimedia should equity, the giant-screenization of liquid crystal indicator, high-definition just constantly develop.
Liquid crystal indicator is made up of backlight unit and liquid crystal display cells portion basically.As backlight unit,, often use the backlight unit of end face irradiation mode from the viewpoint of the densification of liquid crystal indicator.In general, adopt in the liquid crystal indicator of this mode, tabular light conductor is configured in the rear side of liquid crystal display cells portion, at this moment, make an interarea (light-emitting face) of this light conductor opposed with the back side of liquid crystal display cells, also dispose wire or bar-shaped primary sources such as straight pipe type fluorescent lamp, make at least 1 side end face (light-incident end) of itself and light conductor opposed.Make the light that sends from primary source import light conductor inside with this, penetrate from light-emitting face from the light-incident end of light conductor.
As the light conductor of the planar light source device of end face irradiation mode, adopt translucent synthetic resins such as utilizing acrylic resin to form tabular light conductor by forming methods such as injection mo(u)ldings.But, on the blank by the acquisition of forming methods such as injection mo(u)lding, have sprue and cross gate in its end, therefore, after processing and forming, in order to make the light conductor of required size and dimension, with these not part excisions.
Yet, in the light conductor of above-mentioned end face irradiation mode planar light source device, penetrate from primary source, inject the light-incident end of light conductor, the distribution of light in this light conductor that is imported in the light conductor produces very big influence to the emergent light distribution that comes from light-emitting face.The distribution of the light in the light conductor also is subjected to the influence of the proterties of light-incident end.Therefore, in order to obtain, after the above-mentioned part of not wanting of excision, carried out building up by welding processing to remove gate cutting vestige etc. at the high as far as possible light-incident end of whole light conductor proterties homogeneity in the past.
The device that the processing of this building up by welding is to use spy for example to open record in the 2001-260075 communique (patent documentation 1) is finished.In this head face cutting device, the diamond bit that will have greater than the width of the size of the thickness of the processed end face portion of light conductor is fixed on the knife rest, this knife rest is being moved on the processed end face of light conductor and both directions of interarea, according to desired approach, carry out cut repeatedly.Like this, can be processed into the end face that the homogeneity of surface texture is improved at short notice.
But, in recent years, the requirement of the optical property of backlight is improved gradually, particularly require to have the high brightness homogeneity in effective light-emitting zone of the backlight corresponding with effective viewing area of liquid crystal display cells.In addition, if the local extremely low or high zone of brightness that takes place then will especially obviously be found out easily, so the locality of preferably doing one's utmost to suppress so low/generation of high-brightness region.
As this part the object lesson of the reason of low/high-brightness region taking place, can enumerate the situation that is imported into the skewness of the light in the light conductor from primary source by light-incident end.As this locality low/1 form of high-brightness region, can enumerate the oolemma (bright line) and the blanking bar (concealed wire) that in relatively near the zone of primary source, manifest along light-incident end.
Again, in the planar light source device of end face irradiation mode, the peak value (peak light) of the distribution of the light that penetrates from the light-emitting face of light conductor forms for example less angles of 10～40 degree (promptly the normal direction with respect to light-emitting face forms for example bigger angles of 50～80 degree) with respect to this light-emitting face usually, for the distribution peak value that makes such light conductor emergent light direction, usually prismatic lens is configured on the light conductor light-emitting face near the light-emitting face normal.Yet, import by light-incident end under the big situation of light skewness in the light conductor from primary source, from prismatic lens the ratio of the skew ray of light conductor exit facet normal wide-angle tilt ejaculation can not be ignored sometimes by the deflecting action ground of the light direct of travel that described prismatic lens causes.
Above such oolemma, blanking bar and skew ray problem takes place, along with the slimming of light conductor (for example 2～3mm) development and remarkable day by day.
Again, in recent years, require liquid crystal indicator to increase the ratio of display frame size and its physical dimension as far as possible, improve display efficiency.Therefore, even planar light source device, also requirement increases the ratio of the physical dimension of light-emitting area size and planar light source device as far as possible, promptly reduces the size of the structure division (being sometimes referred to as " picture frame ") that exists as frame around light-emitting area as far as possible.
On the other hand, planar light source device also is required slimming, in order to tackle this requirement, must make the light conductor slimming.In the planar light source device of end face irradiation mode, inject the light of the light-incident end of light conductor from primary source, its part with respect to light-emitting face or the back side with the incident angle incident more than the cirtical angle of total reflection, by inside surface total reflection leaded light, a part is injected light-emitting face with the angle less than the cirtical angle of total reflection in addition, and its part penetrates from light-emitting face.Slimming (for example about thickness 0.5mm～3mm) along with light conductor, the light that sends from primary source is under the situation that the light-incident end near zone of the light-emitting face of light conductor penetrates, along with the variation of the distance of leaving light-incident end, periodically manifest hi-lite (bright line or oolemma) and low-light level part (concealed wire or blanking bar).Though under the big situation of picture frame width, in fact this phenomenon does not become problem especially, if adopt the planar light source device of little picture frame width as described above, the problem that then exists this influence to cause brightness disproportionation to be found out easily.
Near the generation of the brightness disproportionation such light-incident end results from from the skewness of primary source by the light in the light conductor light-incident end importing light conductor.The form that one of reason of this light skewness is the light conductor light-incident end how.Therefore, in for example TOHKEMY 2000-214334 communique (patent documentation 2), disclosed as preventing to produce the method that brightness disproportionation as described above is used, just make the angle of light-incident end and light-emitting face form for example following obtuse angle of 93 degree, the interarea of opposition side that makes the light-emitting face of light-incident end and light conductor is that the angle at the back side for example forms 89.4233 and spends.In addition, the angle that has disclosed the angle that makes light-incident end and light-emitting face and the light-incident end and the back side in for example TOHKEMY 10-319339 communique (patent documentation 3) is identical, and its angle is that for example 80 degree are above and less than the situations of 90 degree.In addition, for example Japanese kokai publication hei 7-198956 communique (patent documentation 4) has disclosed the means that the light that prevents primary source is mirrored, promptly the light-incident end near zone at the conductor body back side forms reverse inclination portion, and making it be inclined to light conductor thickness increases away from light-incident end.
In addition, near the generation of the brightness disproportionation the light-incident end as described above is also relevant with the proterties of light-incident end.Therefore, disclosed in for example Japanese kokai publication hei 9-160035 communique (No. 3253001 communique of patent) (patent documentation 5) as preventing the method that brightness irregularities as described above is used, the arithmetic average roughness Ra that is about to the direction parallel with light-emitting face of light-incident end is set at the method for 0.05～0.3 μ m.In addition, the arithmetic average roughness Ra that has disclosed light-incident end in for example TOHKEMY 2001-83512 communique (patent documentation 6) is set at 0.05～0.3 μ m, and makes the method for the degree of roughness of the direction parallel with light-emitting face greater than the degree of roughness of light conductor thickness direction.In addition, the maximum height Ry that has disclosed light-incident end in for example TOHKEMY 2002-324424 communique (patent documentation 7) is set at 3～5 μ m, average roughness Ra is set in more than 0.3 or 0.3, below 0.6 or 0.6, for this reason, light-incident end is made the method for the face of for example dark glassy surface formation.Also have, having disclosed in for example TOHKEMY 2000-306410 communique (patent documentation 8) and having formed the drift angle that forms along the direction parallel with light-emitting face at light-incident end is the method for the prism of 160～175 degree.
Summary of the invention
Therefore above-mentioned head face cutting device and use the cutting process of this device can not fully tackle the generation of above-mentioned oolemma and blanking bar and the generation of skew ray, can't say that the quality of planar light source device has obtained abundant raising.
The light-incident end of the synthetic resin system light conductor that cut obtains from microcosmic, the microtexture such as small concavo-convex that has that cutting vestige that produces as the lathe tools such as diamond bit of cut instrument and the synthetic resin partial melting that causes because of the frictional heating between lathe tool and synthetic resin produce.Relation between the proterties of the light conductor light-incident end that the inventor produces such cut and the optical property of light conductor is inquired into.Found that when making light conductor, because of the cut condition of light-incident end, the cutting tool that particularly uses are the morphological feature difference of lathe tool, the generation of above-mentioned oolemma and blanking bar and skew ray situation occurred change.Promptly find by suitably setting the generation of skew ray that the cut condition can fully suppress the generation of oolemma and blanking bar, thereby realize the present invention.
If adopt the method for above-mentioned patent documentation 5～patent documentation 8,, can reduce near the brightness irregularities of light-incident end then by the specific proterties of the surface texture that makes light-incident end again.
Yet the problem that the light conductor slimming in the planar light source device of little picture frame width brings also exists beyond above-mentioned situation.The i.e. light that sends as the primary source influence of on the light conductor crest line on light-incident end that forms light conductor and the border between the light-emitting face, working and being produced as secondary souce, near light-incident end, penetrate unusual strong light (generation skew ray) from the light-emitting area of planar light source device to the vergence direction that its normal direction is tilted, backlight as liquid crystal indicator uses, in this case, the quality of display image will be reduced.
Adopt under the situation of method of above-mentioned patent documentation 5～8, can't fully suppress such phenomenon.
Again, the method for above-mentioned patent documentation 4 is only effective to the light conductor of the light scattering type that makes light scattering in volumetric region.In addition, if only adopt the method for above-mentioned patent documentation 2 or 3, then can't fully tackle the generation of brightness disproportionations such as mirroring of primary source and two kinds of situations of generation of skew ray.
The objective of the invention is to, a kind of brightness disproportionation that is not easy to see in the light conductor light-incident end near zone that the light conductor slimming brings is provided, near light-incident end few planar light source device that produces skew ray with and the light conductor that uses.
Even adopt the present invention, as the method that solves above-mentioned technical task, the manufacture method of a kind of end face irradiation mode planar light source device with light conductor is provided, described light conductor guiding is from the light of primary source emission, and has a light-emitting face that allows from the light-incident end of the light incident of described primary source emission and allow the light outgoing that guided, it is characterized in that, material as described light conductor adopts the material that is formed by translucent synthetic resin, utilizing 3 ° of relief angles and above 4.5 ° and following and anterior angle is that 8 ° and following lathe tool carry out cut, with this described light-incident end is carried out finishing.
Again, if adopt the present invention, method as solving above-mentioned technical task then will provide a kind of lathe tool, and described lathe tool is when the planar light source device of making end face irradiation mode is used light conductor, the lathe tool that uses in the cut of described light-incident end, the guiding of described light conductor is from the light of primary source emission, and has the light-emitting face that allows from the light-incident end of the light incident of described primary source emission and allow the light outgoing that guided, and formed by translucent synthetic resin, it is characterized in that
Relief angle is 3 ° and above 4.5 ° and following, and anterior angle is 8 ° and following.
In the form of the present invention, the anterior angle of above-mentioned lathe tool be 3 the degree or more than 3 °.In a form of the present invention, the radius-of-curvature of the front end of above-mentioned lathe tool is 1.5 μ m or above 6 μ m or following.In the form of the present invention, above-mentioned lathe tool adopts the sintered polycrystalline diamond particle as bonded-abrasive.In the form of the present invention, above-mentioned its average particulate diameter of sintered polycrystalline diamond particle is at 0.3 μ m or above 30 μ m or following.
Also have, if adopt the present invention, as the method that solves above-mentioned technical task, a kind of planar light source device light conductor then is provided, described light conductor is the light of guiding from the primary source emission, and have the light conductor at the back side of the light-emitting face that allows from the light-incident end of the light incident of described primary source emission and allow the light outgoing that guided and opposition side thereof, it is characterized in that
The angle that described light-incident end and the described back side constitute be 89.4 ° and more than, 91 ° and following,
Described light-incident end, its average slope angle that utilizes on about thickness direction of the described light conductor that super degree of depth measuring shape measurement microscope obtains be 3 ° and more than, 12 ° and following.
In the form of the present invention, the pitch angle 20 during its pitch angle that obtains according to the microscopical measurement of super degree of depth measuring shape of above-mentioned light-incident end distributes spend or above composition exist ratio 40% or below.In the form of the present invention, the average roughness Ra of the center line of the thickness direction of its above-mentioned light conductor that microscopical measurement obtains according to super degree of depth measuring shape of above-mentioned light-incident end is at 0.2 μ m or above 0.4 μ m or following.In the form of the present invention, 10 mean roughness Rz of the thickness direction of its above-mentioned light conductor that microscopical measurement obtains according to super degree of depth measuring shape of above-mentioned light-incident end are at 0.7 μ m or above 2 μ m or following.In the form of the present invention, above-mentioned light-incident end is its uneven surface, and have on the direction vertical with the thickness direction of above-mentioned light conductor a plurality of lens arrays of extending in parallel to each other, and its section shape lens arrays of comprising curve forms face or possesses a plurality of lens arrays of extending in parallel to each other and at least a portion of this lens arrays is carried out asperitiesization and the asperities lens arrays that forms forms face on the direction vertical with the thickness direction of described light conductor.In the form of the present invention, above-mentioned light-emitting face is made of uneven surface.In the form of the present invention, the above-mentioned back side be have with the direction of above-mentioned light-incident end approximate vertical on the lens arrays of a plurality of lens arrays of extending in parallel to each other form face.
If employing the invention described above, utilize to adopt relief angle in 3 degree or above 4.5 degree or following and anterior angle cut at 8 degree or following lathe tool, the light-incident end of the light conductor that translucent synthetic resin is constituted carries out finishing, can easily obtain to form the light conductor of light-incident end proterties of planar light source device of the generation of the generation that can fully suppress oolemma and blanking bar and skew ray.
In addition, if employing the invention described above, then by the angle with the light-incident end and the back side be set at 89.4 above 91 degree of degree or below, with the average slope angle of about light conductor thickness direction of light-incident end be set in 3 degree or above 12 degree or below, the brightness disproportionation in the light conductor light-incident end near zone that the light conductor slimming causes will be difficult to find out in the planar light source device, and near the generation of the skew ray light-incident end can be reduced.
Description of drawings
Fig. 1 is the structural representation that is used for illustrating an example of the building up by welding processing unit (plant) that planar light source device of the present invention uses with the enforcement of the manufacture method of light conductor.
Fig. 2 is the schematic perspective view of Fig. 1.
Fig. 3 is the synoptic diagram that the position relation between light conductor and finishing cutting tool and the rough cut cutter is shown.
Fig. 4 utilizes the position of the rough cut cutter that cutter supporting location switch means carries out to switch key diagram with rough cut processing and smart cut.
Fig. 5 is the key diagram of the morphological feature of finishing cutting tool.
Fig. 6 is the stereographic map of end face irradiation mode backlight.
Fig. 7 illustrates the state that utilizes prismatic lens to make light deflection.
Fig. 8 illustrates to adopt the schematic perspective view of planar light source device of the present invention with an example of the planar light source device of light conductor.
Fig. 9 is the fragmentary cross-sectional view of the planar light source device of Fig. 8.
Figure 10 is the part amplification profile of light conductor.
Figure 11 is the part amplification profile of light conductor.
Figure 12 is the synoptic diagram that the state of light deflection in the light deflection element is shown.
Figure 13 be illustrate the light conductor light-emitting face particularly from the synoptic diagram of the state of the light outgoing of light-incident end near zone.
Figure 14 be illustrate the light deflection element exiting surface particularly from the synoptic diagram of the state of the light outgoing of light conductor light-incident end near zone.
The measurement result of the normal brightness of Figure 15 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 16 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 17 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 18 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 19 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 20 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 21 presentation surface light supply apparatus.
The measurement result of the normal brightness of Figure 22 presentation surface light supply apparatus.
Embodiment
Below with reference to accompanying drawing example of the present invention is described.
Fig. 1 is the schematic diagram that is used for illustrating an example of the building up by welding processing unit (plant) that planar light source device of the present invention uses with the implementation process of the manufacture method of light conductor, and Fig. 2 is its schematic perspective view.Also record and narrate an embodiment of cutting processing turning tool of the present invention here.
In these figure, symbol 2 expressions are as the tabular light conductor of machined object.Light conductor 2 is made of translucent synthetic resin, is used to constitute the backlight of the end face irradiation mode that liquid crystal indicator uses.Light conductor 2 have 2 interarea 2a, 2b and with end face 2c, 2d, 2e, the 2f of the neighboring adjacency of these interareas.Interarea 2a is used as light-emitting face, and end face 2c is used as light-incident end.Light conductor 2 is positioned on the desired position by the not shown support means that are provided with on the not shown processing unit (plant) main body, roughly keeps level (just making interarea 2a, 2b be positioned at the face parallel with the XY face).End face 2c is processed end face, is on the position parallel with the XZ face.The translucent synthetic resin plate is not particularly limited on material, as long as can cut, detail will be set forth later, be that resin constitutes by for example acrylic resin, polycarbonate-based resin or cyclopolyolefin.
In knife rest support sector 8, install can positive and negative rotation servomotor 8b, its revolving force is sent to ball screw 8c.Utilize 8 knife holders 10 of knife rest support sector, it can be moved on directions X.Promptly, the mating component 10a that will cooperate with ball screw 8c is installed on the knife rest 10, by driving servomotor 8a it stopped, and can make knife rest 10 move on the directions X and stop on the desired position.Also have, but will guide knife rest 10 to be arranged on (not shown) in the knife rest support sector 8, make knife rest 10 along this guide rail and above-mentioned ball screw 8c parallel moving on directions X at the guide rail of mobile usefulness on the directions X.
In order to improve the mobile accuracy of knife rest 10, preferably make the configuration that is parallel to each other of above-mentioned 2 guide rails.Ball screw 8c is mainly only had drive the function of knife rest, and have the knife rest of making 10 and prop up with the high position precision and be held on the guide rail, and the function of the vibration when suppressing to drive knife rest 10.
Preferably moderately set the gap between knife rest 10 and the guide rail.This gap preferably is set at for example 1～5 μ m.If the gap is departed from above-mentioned scope and become too small, then can't drive knife rest 10 sometimes.And, then when driving knife rest 10, will produce the vibration that skew causes sometimes if the gap is departed from above-mentioned scope and become excessive, become the irregular relief pattern of the reason of skew ray generation at the light conductor end face.
Cutter supporting location switch means 10b is attached on the knife rest 10, and the side in smart cutting tool 12 and the rough cut cutter 14 is being switched, supported along cut the 1st position that mobile moving direction (Y direction) advances and the 2nd position that retreats from the opposing party.This cutter supporting location switch means, particularly be by for example between the 1st position and the 2nd position, only supporting the member of rough cut cutter 14 to constitute to changeable position, but also only support smart cutting tool 12, also can oppositely support to switching position cutting tool 12,14 mutually simultaneously with ground, changeable position.Only support the cutter supporting location switch means 10b of rough cut cutter 14 as ground, changeable position, for example have rough cut cutter 14 is supported, its position on the Y direction can be changed with respect to cutter 10, utilize cylinder etc. on the Y direction, to drive the means of the member that moves simultaneously with rough cut cutter 14.
Fig. 3 is the synoptic diagram of the position relation on the Z direction that illustrates between light conductor 2, smart cutting tool 12 and the rough cut cutter 14.As shown in the figure, smart cutting tool 12 and rough cut cutter 14 have the big width (Z direction size) of width (Z direction size) than the end face 2c of light conductor 2, can utilize smart cutting tool 12 or rough cut cutter 14 simultaneously the whole width of light conductor 2 end face 2c to be processed.
Above-mentioned servomotor 4a, travelling belt 4b, screw axis 4c, female threaded member 8a and knife rest support sector 8 constitute incision travel mechanism, and above-mentioned servomotor 8b, ball screw 8c and mating component 10a constitute conveying travel mechanism.Servomotor 4a, 8b and cutter supporting location switch means 10b are by control part 20 controls.Below with reference to Fig. 4 and Fig. 5 the action of control part 20 is described.
Fig. 4 is that the position of the rough cut cutter 14 that carries out of cutter supporting location switch means 10b is switched, the key diagram of rough cut processing and smart cut, and Fig. 5 is the key diagram of the morphological feature of smart cutting tool 12.
Add man-hour in the rough cut of carrying out light conductor end face 2c, according to instruction from control part 20, shown in Fig. 4 (a), cutter supporting location switch means 10b switches to the 1st position (1) that smart relatively cutting tool 12 marches forward on the Y direction (promptly near light conductor 2) with rough cut cutter 14 with respect to the position of knife rest 10.In this state, according to instruction from control part 20, servomotor 8b just changes repeatedly, reverses in desired timing, like this, utilize to carry travel mechanism to make the rough cut cutter 14 on the knife rest 10 come and go and move with desired stroke (greater than the distance of the directions X size of light conductor end face 2c) along directions X.According to instruction, make servomotor 4a and servomotor 8b synchronously simultaneously, just change repeatedly, reverse, utilize incision travel mechanism that the rough cut cutter 14 on the knife rest 10 is moved along the Y direction is round like this in desired timing from control part 20.Particularly, among Fig. 1, Fig. 4 and Fig. 5, rough cut cutter 14 carries out rough cut processing when mobile from right to left along directions X, when the left end of directions X stroke reverses, only make rough cut cutter 14 retreat (promptly away from light conductor) slightly along the Y direction, when the right-hand member of directions X stroke reverses, make rough cut cutter 14 add the distance of the above-mentioned amount of retreating along the Y direction desired approach (for example about 10～30 μ m) of only advancing.Wish the rough cut of number of times (for example 5～30 times) like this.
When rough cut processing carries out the transition to smart cut, at first according to instruction from control part 20, shown in Fig. 4 (b), cutter supporting location switch means 10b with rough cut cutter 14 with respect to cutter 10 the position switch to the 2nd position (2) that smart relatively cutting tool 12 retreats on the Y direction.Then, under this state, according to the instruction from control part 20, servomotor 4a just changes, and like this, shown in Fig. 4 (c), utilizes incision travel mechanism that the rough cut cutter 14 on the knife rest 10 is advanced along the Y direction.Make the distance of poor (this value is known, for example 100 μ m) of the front position of this advance front position that on the Y direction, only is slightly smaller than the 1st locational rough cut cutter 14 and smart cutting tool 12.Finish the preparation of finishing cut with this.
When carrying out the smart cut of light conductor end face 2c, according to instruction from control part 20, servomotor 8b just changes repeatedly and reverses in desired timing, utilizes like this and carries travel mechanism to make the smart cutting tool 12 on the knife rest 10 come and go and move with desired stroke (greater than the distance of the size of the directions X of light conductor end face 2c) along directions X.Simultaneously,, make servomotor 4a and servomotor 8b synchronous, just change repeatedly and reverse, utilize incision travel mechanism that smart cutting tool 12 on the knife rest 10 is come and gone along the Y direction like this and move in desired timing according to instruction from control part 20.Particularly, among Fig. 1, Fig. 4 and Fig. 5, smart cutting tool 12 carries out smart cut when mobile from right to left along directions X, when the left end counter-rotating of directions X stroke, smart cutting tool 12 is retreated slightly along the Y direction, when the counter-rotating of the right-hand member of directions X stroke, make cutting tool 12 add the distance of the above-mentioned amount of retreating along the Y direction desired approach (for example about 2～20 μ m) of only advancing.Wish the smart cut of number of times (for example about 2～20 times) like this.In the terminal stage of smart cut, preferably carry out for several times approach almost being set at the cut of 0 μ m.Adopt this method, can obtain cut face stable and the good proterties that individual deviation is little.
When carrying out this essence cut, the conveying translational speed of the directions X of knife rest 10 can be set in the certain speed in 50～2000mm/sec scope for example, in addition, also can when each cutting, the conveying translational speed of the directions X of knife rest 10 for example changed in 50～2000mm/sec scope.
Yet, not in this example, as shown in Figure 5, as its relief angle of diamond bit D1 of cutting tool 12 be 3 degree or above 4.5 degree or below, anterior angle D2 be 3 degree or above 8 spend or below, the radius of curvature R of front end is at 1.5 μ m or above 6 μ m or following.If relief angle D1 oolemma then occurs easily less than 3 degree, if relief angle D1 blanking bar then occurs easily greater than 4.5 degree.In addition, if anterior angle D2 is less than 3 degree, then easily because of cutting produces burr, if anterior angle D2 then is easy to generate skew ray greater than 8 degree.In addition, if the radius of curvature R of front end is less than 1.5 μ m, then the face of tool mirror-polishing is easy to generate blanking bar, if the radius of curvature R of front end is greater than 6 μ m, the resistance when then cutting is big, and the face of tool is coarse, is easy to generate oolemma.
Adopt the light conductor that obtains in the above described manner, can form the planar light source device of end face irradiation mode shown in Figure 6.Promptly the wire primary source 101 of configuration band reverberator 102 makes itself and light conductor end face (light-incident end) 2c opposed, and configuration light-reflecting sheet 105 makes itself and light conductor interarea (light-emitting face) 2b opposed, disposes prismatic lens 104 on light conductor light-emitting face 2a.Also have, an interarea of light conductor is that light-emitting face 2a adopts the uneven surface with directionality light outgoing function, and upwardly extending a plurality of prism row are formed at another interarea (back side) 2b in parallel to each other in the side vertical with light-incident end 2c.In addition, a plurality of prisms row that extending on the directions X abreast with primary source 101 be formed in parallel to each other with prismatic lens 104 with the opposed lower surface of light conductor light-emitting face 2a (incidence surface) 104a on.
It is the interior face of 0.5～15 degree scope that light conductor light-emitting face 2a goes up the average slope angle θ a that records and narrates among the uneven surface employing ISO4287/1-1984 that forms, especially for the desired directionality light outgoing that realizes from hope in the YZ face, the even this point of seeking the brightness in the light-emitting face is desirable.Average slope angle θ a is better in the scope of 1～12 degree, preferably in the scope of 1.5～11 degree.
According to ISO4287/1-1984, use contact pin type surfaceness meter that the uneven surface shape is measured, the coordinate of direction of measurement is designated as x, according to the slant function f that obtains (x), with following formula (1) and formula (2), can obtain the average slope angle θ a of uneven surface.
Δa＝(1/L)∫
0 L|d/(dx)f(x)|dx …(1)
θa＝tan
-1(Δa) …(2)
Here, L measures length, and Δ a is the tangent of average slope angle θ a.
Also have, as light conductor 2, its light exitance is good in 0.5～5% scope, the scope Nei Zegengjia 1～3%.This be because, if the light exitance is less than 0.5%, thereby the few tendency that can't obtain sufficient brightness of light quantity that penetrates from light conductor 3 is arranged then, if the light exitance is greater than 0.5%, near ejaculation primary source of a large amount of light is then arranged, the emergent light of the directions X in the light-emitting face 2a is obviously decayed, thereby the uniformity coefficient of the brightness of light-emitting face 2a has the tendency of reduction.
Utilize such light conductor 2, can be in YZ face perpendicular to light-incident end 2c and light-emitting face 2a, the angle that makes the peak light the emergent light photometric distribution of the light that penetrates from light-emitting face 2a with respect to the normal of light-emitting face in the scopes of 50～80 degree, and making its half value full duration is that 10～40 light with the high outgoing characteristic of directivity of spending penetrate from light-emitting face 2a, can utilize prismatic lens 104 to make its exit direction deflection effectively, thereby the planar light source device with high brightness can be provided.
Among the present invention, be defined as follows from the light exitance of light conductor 2.If the thickness (Z direction size) of light conductor 2 is designated as t, then light intensity (the I of the emergent light of the ora terminalis of the light-incident end 2c side of light-emitting face 2a
0) and the relation of the formula (3) below the relation between the locational emergent light intensity (I) of the ora terminalis distance L of light-incident end 2c side satisfies.
I＝I
0(α/100)[1-(α/100)]
L/t …(3)
Here, constant alpha is the light exitance, the ratio (percent: %) of the light of light conductor 2 outgoing of the per unit length (length that is equivalent to the light conductor thickness t) of the directions X vertical with light-incident end 2c that is light from the light-emitting face 2a.Axis of ordinates is set at logarithm from the light intensity of the emergent light of light-emitting face 2a, abscissa axis is set at (L/t),, can obtain this light exitance α according to its gradient with its relation mapping.
In addition, the prism row control that go up to form of the back side 2b of light conductor 2 with from the emergent light of the light conductor directivity in the face (XZ face) parallel with primary source 101.Also can form biconvex lens row, the alternative prism row of V font groove.It is good that the prism that light conductor back side 2b go up to form is listed as the scopes that its drift angle is set in 85～110 degree.This is because can make from the appropriate convergence of the emergent light of light conductor 2 by drift angle being set in this scope, thereby can seek to improve the brightness as planar light source device, and it is then better that this drift angle is set in 90～100 scopes of spending.
Accurately make desirable prism row shape in the light conductor of the present invention in order to be implemented in, obtain stable optical property, the wearing and tearing at the prism top when using when suppressing assembly operation simultaneously and as light supply apparatus and the purpose of distortion also can form planar portions or curved face part at the top of prism row.
2 interarea 104a, 104b as the prismatic lens 104 of light deflection element are arranged parallel to each other as a whole, are in the position parallel with the XY face respectively as a whole.As incidence surface 104a, another is as exiting surface 104b with one among interarea 104a, the 104b (being positioned at the interarea of the light-emitting face 2a side of light conductor 2).Exiting surface 104b is formed the parallel plane with light conductor light-emitting face 2a.Incidence surface 104a is formed the prism row formation face that a plurality of prism row that extend are arranged parallel to each other on directions X.Prism row formation face also can be provided with the less planar portions of width (approximately identical with the Y direction size of for example prism row or less than the planar portions of the width of this size) between the prism of adjacency row, but, preferably planar portions is not set and disposes the prism row continuously along directions X from improving this point of utilization ratio of light.
Fig. 7 illustrates the light deflection state that prismatic lens 104 causes.This illustrates the direct of travel from the peak light of the light conductor in the YZ face 2 (with the corresponding light of the photodistributed crest of outgoing).With the peak light that angle a tilts to penetrate, inject the 1st that prism is listed as from light conductor light-emitting face 2a, by the 2nd total reflection, approximately the normal direction along exiting surface 104b penetrates.In addition, in the XZ face, utilize the effect of the prism row of light conductor as described above back side 2b, can in zone on a large scale, seek fully to improve the brightness of the normal direction of exiting surface 104b.
The shape of the prism facets of the prism row of prismatic lens 104 is not limited to single plane, and for example can also making, section is convex polygon shape or convex curve surface shape.Can seek high brightnessization, Narrow Field Of Visionization with this.
Accurately make desirable prism shape in the prismatic lens 104 in order to be implemented in, obtain stable optical property, the wearing and tearing at the prism top when using when suppressing assembly operation simultaneously and as light supply apparatus and the purpose of distortion also can form planar portions or curved face part at the top of prism row.At this moment, the planar portions that the top of prism row forms or the width setup of curved face part are below 3 μ m, this viewpoint from the generation of brightness decline that suppresses light supply apparatus and the brightness disproportionation pattern that adherent phenomenon causes considers it is desirable, is set in below the 2 μ m goodly, is set in below the 1 μ m and also will gets well.
Above-mentioned light conductor 2 and prismatic lens 104 can be made of the high synthetic resin of light transmission.As such synthetic resin, for example methacryl resin, acrylic resin, polycarbonate-based resin, polyester based resin, polyvinyl chloride resin can have been enumerated.Especially methacryl resin the best, the height of its light transmission, thermotolerance, mechanical characteristic, processing and forming are good, the most suitable.Such methacryl resin is to be the resin of principal ingredient with the methyl methacrylate, and preferably methyl methacrylate is more than 80 weight %.When construct on surfaces such as uneven surface that forms light conductor 2 and prismatic lens 104 and prism row, also can have the mold component of constructing on desirable surface the lucite plate is carried out hot pressing, also can utilize methods such as serigraphy, extrusion modling and injection mo(u)lding to carry out processing and forming and give shape simultaneously by use.In addition, can also adopt heat or light-cured resin etc. to form structural surface.Moreover, also can form uneven surface structure or lens arrays array structure that the active energy ray-curable resin is formed on the surface of transparent base materials such as transparent membrane of forming by polyester based resin, acrylic resin, polycarbonate-based resin, polyvinyl chloride resin, polymethyl (acyl) imines resinoid etc. or thin slice, also can utilize methods such as joint, welding, this such thin slice is bonded on the independent transparent base material form one.As the active energy ray-curable resin, can use multifunctional (methyl) acyclic compound, vinyl compound, (methyl) esters of acrylic acid, allyl compound, (methyl) acrylic acid slaine etc.
Then, Fig. 8 illustrates to adopt the schematic perspective view of planar light source device of the present invention with an example of the planar light source device of light conductor.Fig. 9 is the sectional view of this part.As shown in the figure, its formation of the planar light source device of this example comprises, with at least 1 side end face as light-incident end 231, will with a surface of its approximate vertical as the light conductor 23 of light-emitting face 233, be configured to and wire that by light source reflector 22 cover opposed with the light-incident end 231 of this light conductor 23 primary source 21, be configured in light deflection element 24 on the light-emitting face of light conductor 23, be configured to the back side 234 opposed photocells 25 with the opposition side of the light-emitting face 233 of light conductor 23.
Be in position with XY face almost parallel respectively with 2 interareas of light-incident end 231 approximate vertical of light conductor 23, any one face (upper surface among the figure) becomes light-emitting face 233.By giving at least one face in this light-emitting face 233 or its back side 234 by the directionality light outgoing mechanism that uneven surface constitutes, the light of light-incident end 31 is injected in guiding in light conductor 23, and the light that has directivity in perpendicular to both faces (XZ face) of light-incident end 231 and light-emitting face 233 is penetrated from light-emitting face 233.The peak value direction (peak light) of the emergent light photometric distribution in distributing in this XZ face is designated as α with the angle that light-emitting face 233 forms.Angle [alpha] is for example 10～40 degree, and the half value full duration of emergent light photometric distribution is for example 10～40 degree.
Form and constitute the uneven surface and the lens arrays of directionality light outgoing mechanism on the interarea of light conductor 23, its average slope angle θ a ' adopts 0.5～15 degree scope, and this considers it is desirable from the uniformity coefficient this point of seeking to improve the brightness in the light-emitting face.Average slope angle θ a ' is at 1～12 degree scope Nei Gengjia, and is the most desirable in 1.5～11 degree scopes.The measuring method of average slope angle will be set forth later.
In addition, in order to control from the emergent light of light conductor 23 directivity in face (YZ) face parallel with primary source 21, another interarea that preferably is not endowed directionality light outgoing mechanism forms face as the lens arrays of arranging along a plurality of lens arrays of extending with the direction (being roughly directions X) of light-incident end 231 approximate vertical.In the example shown in Figure 8, on light-emitting face 233, form uneven surface, form on 234 overleaf and go up the lens arrays that a plurality of lens arrays of extending rearrange along direction (being roughly directions X) and form face with light-incident end 231 approximate vertical.In the present invention, also can be opposite with example shown in Figure 8, on light-emitting face 233, form lens arrays and form face, uneven surface is made at the back side 234.
As shown in Figure 8, being formed on the lens arrays that the controlling party tropism uses in the YZ face on the back side 234 of light conductor 23 or light-emitting face 233 forms under the situation of face, as this lens arrays, can list the prism row, biconvex lens row, the V font groove that approximately extend, but preferably adopt the shape of YZ section to be approximately leg-of-mutton prism row along directions X.
Among the present invention,, preferably its drift angle is set in the scopes of 85～110 degree forming on the back side 234 of light conductor 23 under the situation of prism row formation face as lens arrays formation face.This is because can moderately make from the emergent light of light conductor 23 and assemble by drift angle being set in this scope, thereby can seek to improve the brightness as planar light source device, and the scopes that this drift angle are set in 90～100 degree are then better.
Accurately make desirable prism row shape in the light conductor of the present invention in order to be implemented in, obtain stable optical property, the wearing and tearing at the prism top when using when suppressing assembly operation simultaneously and as light supply apparatus and the purpose of distortion also can form planar portions or curved face part at the top of prism row.
Moreover, among the present invention, also can with the light outgoing mechanism that forms on light-emitting face 233 as described above or its back side 234 simultaneously and usefulness, in the inner additional directivity light outgoing mechanism that makes light diffusing particulate and make its dispersion that adds of light conductor.
Figure 10 is that the part of the light conductor 23 in this example enlarges sectional view.Light conductor 23 its light-incident ends 231 are θ 1 with the angle of light-emitting face 233, and light-incident end 231 is θ 2 with the angle at the back side 234.Also have, these angles θ 1, θ 2 be meant light-incident end 231 and near it for example 5mm with the angle at the interior light-emitting face 233 or the back side 234.In addition, light conductor 23 forms the thicker wedge shape of its light-incident end 231, and the angle of wedge is θ 3.This wedge angle 3 is meant the light-emitting face 233 of the evenness on the directions X and the angle at the back side 234.Angle θ 1 88.2 the degree or above 89.6 the degree or below, preferably 88.6 the degree or above 89 the degree or below.Angle θ 2 89.4 the degree or above 91 the degree or below, preferably 90 the degree or above 90.5 the degree or below.If θ 1, θ 2 depart from these scopes, then obviously there is the tendency of skew ray generation and brightness disproportionation.Wedge angle 3 is at for example 0.1 degree or below the above 1 degree meeting.
The average slope angle θ a of about thickness direction of light entrance face 231 its light conductors 23 is at 3 ° or above 12 ° or following.(be roughly the Z direction by direction with about light conductor thickness d of light-incident end 231, with reference to figure 9) average slope angle θ a be set in this scope, suitably regulate the expansion of the light in the XZ face, particularly make light outgoing (distribution of light quantity and emergence angle) suitable, also just be not easy to see the brightness disproportionation in the light-incident end near zone that the light conductor slimming causes near the zone the light-incident end of light conductor light-emitting face 233.If average slope angle θ a is less than 3 °, then the outgoing light quantity from light conductor light-incident end near zone is little, this regional brightness is low excessively, on the other hand, if average slope angle θ a is above 12 °, then the outgoing light quantity from light conductor light-incident end near zone is big, and this regional brightness is too high, and is difficult to reduce near the oblique unusual light outgoing of light-incident end.The average slope angle θ a of about thickness direction of the light conductor 23 of light-incident end 231 is with 5 ° or above 11 ° or following being advisable, at 6 ° or above 9 ° or with next better.
Average slope angle θ a can be according to using (for example VK8500 (trade name) that makes of the Keyemce company pitch angle acquisition of measuring of super degree of depth measuring shape microscope.Just the super degree of depth measuring shape microscope of use is measured center line average roughness Ra and 10 mean roughness Rz of the faces such as light-incident end of light conductor 23, read Ra in the measurement range, Rz, for this measurement range, under the condition of finishing (ス system-ジ Application グ) 02, extract sectional curve, (in the scope that 1 time can be measured under this measuring condition is about 110 μ m to obtain each measurement point, therefore in the zone the 50 μ m at the two ends on the light conductor thickness direction of light conductor light-incident end by the measurement of uniformly-spaced carrying out 5 positions) on the absolute value at pitch angle, these absolute values are average in addition, obtain average slope angle with this.
With aforesaid average slope angle θ a, the distribution of the number of degrees at the pitch angle of measurement point also exerts an influence to the light outgoing characteristic of planar light source device.During particularly the number of degrees at the pitch angle that obtains based on the microscopical measurement of above-mentioned super degree of depth measuring shape distribute mainly be the pitch angle be 20 ° or above component exist ratio influential near the generation of the unusual light outgoing of the vergence direction the light-incident end.For near the outgoing of the oblique unusual light the light-incident end that reduces planar light source device, this exist ratio be preferably in 40% or below.20 ° at pitch angle during the number of degrees at the pitch angle that obtains based on the microscopical measurement of above-mentioned super degree of depth measuring shape distribute or above component exist ratio 30% or below be advisable, 20% or with next better.
Light-incident end 231 as described above is made of for example uneven surface.As the formation method of uneven surface, can list lathe tool that adopts the invention described above and the method that the building up by welding processing unit (plant) cuts, use method that other milling cutter tools etc. cut, carry out methods such as abrasive method, sandblast processing, electrodischarge machining, electrolytic polishing, chemical grinding with emery wheel, sand paper, rag wheel etc.Sandblast particle as using in the sandblast processing can list the such spheric grain of beaded glass, the such polygon particle of alumina bead, uses the polygon particle can form the big uneven surface of effect that makes the light diffusion, and is therefore ideal.By adjusting the machine direction of cut and attrition process, can form anisotropic uneven surface.In order to regulate the light diffusion in the XY face, can adopt the machine direction that is approximately the Z direction, form big strip concaveconvex shape, in order to regulate the light diffusion in the XZ face about the Z direction, can adopt the machine direction that is approximately the Y direction, form big strip concaveconvex shape about the Y direction.By other a plurality of different machine directions are mutually made up, can form the uneven surface that does not have directivity.This uneven surface processing can directly be implemented the light-incident end of light conductor, but also can implement by the following method, promptly utilizing mold component that translucent synthetic resin is shaped in the die device of light conductor, the light-incident end that the formation face that in advance correspondence duplicated is formed at mold component duplicates on the face that forms usefulness, when moulding it is replicated on the translucent synthetic resin.
In addition, as light-incident end 231, can adopt along direction (Y direction) and go up the face place of crude exasperate that lens arrays formation face that a plurality of lens arrays of extending are arranged parallel to each other is formed perpendicular to the thickness direction (Z direction) of light conductor.Lens arrays can be used the prism row.Comprise curve in its XY section configuration of this lens arrays, this is desirable for the light diffusion effect.Figure 11 is the schematic enlarged drawing that the section configuration of the light-incident end that forms such lens arrays is shown.In this example, it is R and the outside curved surface that protrudes that lens face 231a adopts radius-of-curvature, is the triangular prism shape of P with respect to drift angle φ and spacing, has ultimate range d.Form the formation method of face as the lens arrays of such light-incident end, be advisable with lathe tool that adopts the invention described above and the method that method that the building up by welding processing unit (plant) cuts and the milling cutter tools that uses other etc. cut.This lens arrays forms the processing of face and also can directly implement the light-incident end of light conductor, but also can implement by the following method, promptly utilizing mold component that translucent synthetic resin is shaped in the die device of light conductor, on the face that the light-incident end that duplicates the formation mold component is used, form correspondence in advance and duplicate formation face, when moulding, it is replicated on the translucent synthetic resin.
Also have, light-incident end 231 is to have in parallel to each other the lens arrays that goes up a plurality of lens arrays of extending in the direction (Y direction) perpendicular to the thickness direction (Z direction) of light conductor to form face, and the roughening lens arrays that can be formed by at least a portion roughening that makes lens arrays forms face and forms.Making this roughening lens arrays form the coarse method of face can list and carry out methods such as abrasive method, sandblast processing, electrolytic polishing, chemical grinding with sand paper, rag wheel etc.The processing of these uneven surfaces can be directly to the light-incident end enforcement of the lens arrays that forms light conductor, but also can implement by the following method, promptly utilizing mold component that translucent synthetic resin is shaped in the die device of light conductor, duplicate and form correspondence on the face that forms usefulness and duplicate formation face duplicating the light-incident end that forms mold component in advance, when moulding, it is replicated on the translucent synthetic resin.
As mentioned above, planar light source device is with one of manufacture method of light conductor, by make the translucent synthetic resin moulding with mold component, utilizes the duplicating of shape on the surface of this mold component, obtains the optical material corresponding with light conductor.By means of this, form face with the corresponding optical material in the light-emitting face of light conductor and the back side comparably with the light-emitting face and the back side.Then, carry out cut, form light-incident end, thereby obtain the planar light source device light conductor by face to the optical material corresponding with the light-incident end of light conductor.In addition, planar light source device is by make the translucent synthetic resin moulding with mold component with another of manufacture method, utilize the duplicating of shape on the surface of this mold component, form light-emitting face, the back side and light-incident end, thereby obtain above-mentioned planar light source device light conductor.
The center line average roughness Ra of the thickness direction of light-incident end 231 its light conductors that microscopical measurement obtains based on super degree of depth measuring shape is preferably in 0.2 μ m or above 0.4 μ m or following, and 10 mean roughness Rz of the thickness direction of the above-mentioned light conductor that microscopical measurement obtains based on super degree of depth measuring shape are preferably in 0.7 μ m or above 2 μ m or following.By being set in such scope, the ratio that exists of 20 ° at pitch angle during the easy number of degrees with average slope angle θ a and pitch angle distribute and above component thereof is set in the specialized range.
Again, preferably the surface texture of light-incident end 231 is, it is that the average slope angle θ a on the direction (Y direction) of light conductor thickness direction (Z direction) is that 1～3 degree, center line average roughness Ra are that 0.02～0.1 μ m, 10 mean roughness Rz are 0.3～2 μ m perpendicular to longitudinal direction.Here, average slope angle θ a is preferable in 1.3 degree～2.7 degree scopes, and is then the most desirable in 1.5 degree～2.5 degree scopes.Center line average roughness Ra is preferable at 0.03～0.08 mu m range, and is then the most desirable at 0.05～0.07 mu m range.10 mean roughness Rz are preferable at 0.4～1.7 mu m range, and are then the most desirable in the scope of 0.5～1.5 μ m.
Figure 12 is the synoptic diagram of state that the light deflection of light deflection element 24 is shown.This illustrates an example from the working direction of the peak light of the light conductor in the XZ face 23 (with the corresponding light of the photodistributed peak value of outgoing).Inject the 1st prism facets that prism is listed as from the light-emitting face 233 of light conductor 23 with the peak light that angle a tilts to penetrate, by the 2nd prism facets inside surface total reflection, roughly the normal direction along exiting surface 242 penetrates.In addition, in the YZ face, utilize the effect of the prism row on above-mentioned light conductor surface 234, can in zone on a large scale, seek fully to improve the brightness of the normal direction of exiting surface 242.
As a reference, Figure 13 be illustrate the light conductor light-emitting face particularly from the synoptic diagram of the state of the light outgoing of light-incident end near zone.In addition, as a reference, Figure 14 be illustrate planar light source device the light deflection element exiting surface particularly from the synoptic diagram of the state of the light outgoing of light conductor light-incident end near zone.As Figure 13 and shown in Figure 14, in the zone of the central portion of light conductor light-emitting face 233 (near the zone beyond the light-incident end), as shown in figure 13, the relative light-emitting face 233 angulation α of the peak light of the light of injecting from light-incident end 231 penetrate, light deflection element 24 is injected from a prism facets, reflected by inside surface in another prism facets, penetrate along the exiting surface normal direction.Corresponding, light-incident end near zone at light conductor light-emitting face 233, the relative light-emitting face 233 angulation β of peak light penetrate, inject from a prism facets facing to light deflection element 24, receive or do not receive the inside surface reflection in another prism facets of light deflection element 24 corresponding to the size of angle beta, exiting surface angulation γ penetrates relatively.
Above-mentioned angle beta is subjected to the form of the light-incident end 231 of light conductor, the angle θ 1 that for example forms with light-emitting face 233 and the back side 234 respectively, the influence of θ 2, also be subjected to the influence of surface texture, particularly be subjected to average slope angle θ a and the influence respectively of the pitch angle number of degrees in the XZ face.
If angle θ 1, θ 2 are excessive, then angle beta is less than angle [alpha], and little from this regional outgoing light quantity, therefore, this regional brightness is too low, thus the easy step-down of luminance uniformity.If angle θ 1, θ 2 are too small, then angle beta is greater than angle [alpha], and big from this regional emergent light quantitative change, therefore, this regional brightness excessively increases, thus the easy step-down of luminance uniformity.If angle beta is greater than angle [alpha], the light that light deflection element 24 then occurs injecting is not subjected to the inside surface reflection of prism facets and the component that only is subjected to penetrating behind the refraction action.If this component is too much, near the oblique unusual light outgoing the then above-mentioned light-incident end is obvious.
Also have, if average slope angle θ a is too small, then angle beta is less than angle [alpha], and little from this regional emergent light quantitative change, therefore, this regional brightness is too low, thereby luminance uniformity is low easily.If average slope angle θ a is excessive, then angle beta is greater than angle [alpha], and big from this regional emergent light quantitative change, therefore, this regional brightness too increases, thereby luminance uniformity is low easily.If angle beta is greater than angle [alpha], the light that light deflection element 24 then occurs injecting is not subjected to the inside surface reflection of prism facets and the component that only is subjected to penetrating behind the refraction action.If this component is too much, near the oblique unusual light outgoing the then above-mentioned light-incident end is obvious.
Again, if 20 ° at pitch angle and above component thereof during the number of degrees at pitch angle distribute exist ratio excessive, the light of then injecting light deflection element 24 is not subjected to the inside surface reflection of prism facets and the component that only is subjected to penetrating behind the refraction action is too much, and the oblique unusual light outgoing of above-mentioned light-incident end near zone is obvious.
Therefore, the present invention is in order to realize being equal to central portion or near the light outgoing state of central portion at the light-incident end near zone, the scope that has ratio of 20 ° at pitch angle during the number of degrees at the scope of the scope of angle θ 1, θ 2, average slope angle θ a and even pitch angle are distributed and above component thereof is set in above-mentioned particular range, thereby keeps brightness uniformity and suppress the generation of the oblique unusual light outgoing of light-incident end near zone.
Accurately make desirable prism shape in the light deflection element 24 in order to be implemented in, obtain stable optical property, the wearing and tearing at prism top and the purpose of distortion when using when suppressing assembly operation simultaneously and as light supply apparatus also can form top plan portion or top curve surface portion at the top of prism row.At this moment, the width setup of top plan portion or top curve surface portion is at 3 μ m or following, but the viewpoint of the generation of low as the brightness of light supply apparatus brightness disproportionation pattern that adherent phenomenon cause in from inhibition, the width of top plan portion or top curve surface portion is at 2 μ m or following preferable, at 1 μ m or with next better.
Light conductor 23 of the present invention and light deflection element 24 can be made of the high synthetic resin of light transmission.As such synthetic resin, for example methacryl resin, acrylic resin, polycarbonate-based resin, polyester based resin, polyvinyl chloride resin are arranged.Especially with methacryl resin the best, its light transmission is big, thermotolerance, mechanical characteristic, processing and forming are given birth to good.Such methacryl resin is to be the resin of principal ingredient with the methyl methacrylate, preferably methyl methacrylate 80 weight % or more than.When structure such as the surface of surface structure such as the uneven surface that forms light conductor 23 and light deflection element 24 and prism row or biconvex lens row etc., can use the mold component with desirable surface structure that the lucite plate is carried out hot pressing forms, also can carry out processing and forming, give shape simultaneously by methods such as serigraphy, extrusion modling or injection mo(u)ldings.In addition, can also adopt heat or light-cured resin etc. to form structural surface.Moreover, can form the uneven surface that the active energy ray-curable resin constitutes on the surface that by polyester based resin, acrylic resin, polycarbonate-based resin, polyvinyl chloride resin, polymethyl (acyl) imines is transparent base materials such as the transparent membrane that constitutes such as resin or thin slice constructs or the lens arrays array structure, also can utilize methods such as joint, welding, such thin slice is connected on the independent transparent base material form one.As the active energy ray-curable resin, can use multifunctional (methyl) acyclic compound, vinyl compound, (methyl) esters of acrylic acid, allyl compound, (methyl) acrylic acid slaine etc.
On the light-emitting area (exiting surface 242 of light deflection element 25) of the planar light source device that forms comprising above-mentioned primary source 21, light source reflector 22, light conductor 23, light deflection element 24 and light reflection element 25, as shown in Figure 9, configuration transmission-type liquid crystal display element 28, thus constitute the liquid crystal indicator of planar light source device of the present invention as backlight.The observer observes liquid crystal indicator in the top from Fig. 9.
Embodiment
It is following that further the present invention will be described according to embodiment.
[embodiment 1]
Use is in conjunction with the end face precise machining device of Fig. 1～Fig. 5 explanation, tabular light conductor 2 corresponding with the limit above-mentioned 307.5mm of being of a size of the end face of lateral dimension 307.5mm, the longitudinal size 232.7mm that the method for utilizing injection mo(u)lding and gate cutting is obtained, the acrylic resin system of thickness 2.2mm, is that light-incident end 2c carries out cut.Smart cutting tool 12 and rough cut cutter 14 all use the sintered polycrystalline diamond lathe tool.The average particulate diameter of smart cutting tool 12 its adamas bonded-abrasives is that 10 μ m, relief angle D1 are 3.5 degree, and anterior angle D2 is 4 degree, and the radius of curvature R of front end is 3 μ m.
In the rough cut processing,, implement 7 cuttings according to fixing approach 25 μ m with fixing transporting velocity 2000mm/sec.In the smart cut, the transporting velocity 150mm/sec with fixing implements the cutting that 7 times approach is 5 μ m, implements the cutting that 3 times approach is 3 μ m, implements the cutting that 7 times approach is 0 μ m.
With the light conductor that obtains, make the planar light source device of end face irradiation mode shown in Figure 6.To this planar light source device, lighting primary source 101, the upper surface of viewing prism sheet 104 (exiting surface) 104b, not finding has oolemma, blanking bar and skew ray to take place.(with reference to following table 1)
[embodiment 2～4 and comparative example 1～3]
Except as following table 1 record, the radius of curvature R as relief angle D1, the anterior angle D2 of the diamond bit of smart cutting tool 12 and roughing tool 14 and front end being changed respectively, also make light conductor the samely, use it to make planar light source device with embodiment 1.For the planar light source device that obtains, upper surface (exiting surface) 104b with embodiment 1 the same viewing prism sheet 104 obtains the result shown in the table 1.
[table 1]
| Relief angle D1 (°) | Anterior angle D2 (°) | Front end R (micron) | Oolemma/blanking bar takes place | Skew ray takes | |
| Embodiment | |||||
| 1 | 3.5 | 4 | 3 | Do not have | Do not have |
| | 4.5 | 4 | 5 | Do not have | Do not have |
| | 3 | 4 | 1.5 | Do not have | Do not have |
| | 3 | 6 | 3 | Do not have | Do not have |
| Comparative example 1 | 5 | 4 | 3 | Blanking bar takes place | Do not have |
| Comparative example 2 | 2 | 4 | 3 | Oolemma takes place | Do not have |
| Comparative example 3 | 3 | 10 | 3 | Do not have | Have |
[embodiment 5]
In the present embodiment, the light conductor that illustrates in the example to Fig. 8～12 and use the planar light source device of this light conductor to make.
With glass bead blasting treatment has been carried out on the whole surface of the corrosion resistant plate that carried out the accurately machined useful area 230mm * 290mm of minute surface, thickness 3mm.
On the other hand, form duplicate surface by cut, the surface that this duplicate surface is used to duplicate other corrosion resistant plates that are formed on the useful area 230mm * 290mm, the thickness 3mm that have carried out mirror finish is provided with the prism row formation face of the prism row of 100 ° of drift angles, drift angle front end radius-of-curvature 15 μ m, spacing 50 μ m continuously.
Use cutter to carry out cut, make its roughening along a side end face (end face of the side of thickness 2.2mm) corresponding with the direction of main surface parallel pair and the limit (growing the limit) of the length 290mm of this optical material.Obtain to form light-incident end with this, have light-emitting face that the roughening interarea by optical material constituted and form the light conductor at the back side (prism is listed as to the direction that is approximately perpendicular to light-incident end and extends) that face constitutes by the prism row of optical material.The angle theta 1 of light-incident end and light-emitting face is 88.9 °, and the angle theta 2 at the light-incident end and the back side is 90.0 °.Big on the thickness direction of light conductor to the light entrance face measure surface roughness of the light conductor that obtains.
During measurement, use super degree of depth measuring shape microscope (VK-8500 (trade name) that Keyemce company makes).At first, center line average roughness Ra and 10 mean roughness Rz of about light conductor thickness direction of the light-incident end 231 of light conductor 23 are measured, read Ra, Rz in the measurement range.Use 100 times object lens.In this measurement range, the section configuration of extraction light conductor thickness direction is obtained the absolute value at the pitch angle of each measurement point, and is averaged under finishing (ス system-ジ Application グ) condition (simple average ± 2), obtains average slope angle θ a with this.Also have, in the scope that 1 time can be measured under this measuring condition is about 110 μ m, therefore the zone the 500 μ m at the two ends on the light conductor thickness direction of light conductor light-incident end is obtained mean value by the measurement of uniformly-spaced carrying out 5 positions to each parameter.The result is expressed in table 2.
The primary source 21 that cold-cathode tube is constituted along the longitudinal direction of light conductor 23 is configured to the light-incident end 231 of light conductor 23 opposed, covers with light source reflector 22 (the silver-colored reflectance coating that beautiful smooth Co., Ltd. makes).Light diffusive reflective film (Dongli Ltd. make E60[trade name]) is sticked on the opposite side end face.The light reflection element 25 that the light scattering reflector plate is constituted is configured to the back side 234 as the prism row formation face of light conductor 23 opposed.Include above formation in framework.The peak-peak of its emergent light photometric distribution of this planar light source device (in the XZ face) is 70 degree in the light-emitting face normal direction, and the half value overall with is 22.5 degree.
On the other hand, the employing refractive index is 1.5064 acrylic acid series uv curing resin, being produced on thickness and being the radius-of-curvature that forms one prism facets on the surface of mylar of 125 μ m is the convex curve surface shape of 1000 μ m, another prism facets is a flat shape, the prismatic lens of the prism row that a plurality of prism row of spacing 50 μ m are provided with side by side continuously.The deflecting element 24 that the prismatic lens that obtains is formed is placed to, the prism row form light-emitting face (uneven surface) 233 sides that face above-mentioned light conductor 23, the crest line of prism row is parallel with the light-incident end 231 of light conductor 23, and the plane prism facets of each prism row is towards the light-incident end 231 of light conductor 23.
Also have, on light deflection element 24, dispose liquid crystal display cells (LCD).
For making the planar light source device that obtains as previously discussed, when lighting primary source 21 usefulness visualization light-emitting areas, do not see apart from light conductor light-incident end 233 near the oblique unusual light outgoing of brightness disproportionation and light conductor light-incident end 233 being arranged with interior zone for 30mm on the directions X.
Figure 15 illustrates the normal brightness measurement result of planar light source device.Along with advancing to light conductor incident end face 231, normal brightness steadily descends.Under the situation of such Luminance Distribution, do not see brightness irregularities.
[embodiment 6]
The angle of the cutting tool when making the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut, adopt the implementation method identical, the acquisition planar light source device with embodiment 5 except changing slightly.
The angle theta 1 of its light-incident end of light conductor and light-emitting face is 88.7 °, and the angle theta 2 at the light-incident end and the back side is 90.3 °.
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, do not see on the directions X apart from light conductor light-incident end 233 for 30mm so that near the oblique unusual light outgoing of brightness disproportionation and light conductor light-incident end 233 to be arranged in the interior zone.
Figure 16 illustrates the normal brightness measurement result of planar light source device.Along with advancing to light conductor incident end face 231, normal brightness steadily descends.Under the situation of such Luminance Distribution, do not see brightness irregularities.
Moreover exist ratio, Ra and the Rz of the average slope angle θ a of light conductor light-incident end, 20 ° at pitch angle and above component are equal to embodiment 5.
[embodiment 7～9]
The angle of the cutting tool when making the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut, adopt the implementation method identical, the acquisition planar light source device with embodiment 5 except changing slightly.
The angle theta 1 of its light-incident end of light conductor and light-emitting face is 88.5 ° (embodiment 7), 88.3 ° (embodiment 8), 89.1 ° (embodiment 9), and the angle theta 2 at the light-incident end and the back side is 90.7 ° (embodiment 7), 90.8 ° (embodiment 8), 89.9 ° (embodiment 9).
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, almost do not see on the directions X apart from light conductor light-incident end 233 for 30mm with the brightness disproportionation in the interior zone and near the oblique unusual light outgoing of light conductor light-incident end 233.
Figure 17 (embodiment 7), Figure 18 (embodiment 8), Figure 19 (embodiment 9) illustrate the normal brightness measurement result of planar light source device.Along with advancing to light conductor incident end face 231, normal brightness steadily descends.Under the situation of such Luminance Distribution, almost do not see brightness disproportionation.
Moreover exist ratio, Ra and the Rz of the average slope angle θ a of light conductor light-incident end, 20 ° at pitch angle and above component are equal to embodiment 5.
[comparative example 4～6]
The angle of the cutting tool when making the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut, adopt the implementation method identical, the acquisition planar light source device with embodiment 5 except change.
The angle theta 1 of its light-incident end of light conductor and light-emitting face is 88.1 ° (comparative examples 4), 87.9 ° (comparative example 5), 87.7 ° (comparative example 6), and the angle theta 2 at the light-incident end and the back side is 90.7 ° (comparative examples 4), 90.9 ° (comparative example 5), 91.0 ° (comparative example 6).
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, do not see on the directions X apart from light conductor light-incident end 233 for 30mm with the brightness disproportionation in the interior zone and near the oblique unusual light outgoing of light conductor light-incident end 233.
Figure 20 (comparative example 4), Figure 20 (comparative example 5), Figure 21 (comparative example 6) illustrate the normal brightness measurement result of planar light source device.Along with advancing to light conductor incident end face 231, normal brightness changes with bigger rate of change.Under the situation of such Luminance Distribution, see brightness disproportionation.
Moreover exist ratio, Ra and the Rz of the average slope angle θ a of light conductor light-incident end, 20 ° at pitch angle and above component thereof are equal to embodiment 5.
[embodiment 10]
Finishing cutting speed except will make the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut the time changes to the slow slightly speed, adopts the implementation method identical with embodiment 5, the acquisition planar light source device.With the measurement result that has ratio, Ra and Rz of 20 ° at average slope angle θ a, the pitch angle of the light conductor light-incident end that obtains similarly to Example 5 and above component thereof shown in the table 2.
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, see on the directions X apart from light conductor light-incident end 233 for 30mm with the brightness disproportionation in the interior zone and near the oblique unusual light outgoing of light conductor light-incident end 233.
[embodiment 11]
Finishing cutting speed except will make the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut the time changes to the fast slightly speed, adopts the implementation method identical with embodiment 5, the acquisition planar light source device.With the measurement result that has ratio, Ra and Rz of 20 ° at average slope angle θ a, the pitch angle of the light conductor light-incident end that obtains similarly to Example 5 and above component thereof shown in the table 2.
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, almost do not see on the directions X apart from light conductor light-incident end 233 for 30mm with the brightness disproportionation in the interior zone and near the oblique unusual light outgoing of light conductor light-incident end 233.
[comparative example 7]
Finishing cutting speed except will make the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut the time changes to very slowly the speed, adopts the implementation method identical with embodiment 5, the acquisition planar light source device.With the measurement result that has ratio, Ra and Rz of 20 ° at average slope angle θ a, the pitch angle of the light conductor light-incident end that obtains similarly to Example 5 and above component thereof shown in the table 2.
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, observing on the directions X becomes the blanking bar that be lower than other parts for 30mm with the brightness in the interior zone apart from light conductor light-incident end 233, and luminance uniformity is low.In addition, also see near the oblique unusual light outgoing of light conductor light-incident end 233.
[comparative example 8]
Finishing cutting speed except will make the cutter of using corresponding to a side end face roughening on the long limit of optical material carry out cut the time changes to the very fast speed, adopts the implementation method identical with embodiment 5, the acquisition planar light source device.With the measurement result that has ratio, Ra and Rz of 20 ° at average slope angle θ a, the pitch angle of the light conductor light-incident end that obtains similarly to Example 5 and above component thereof shown in the table 2.
For the planar light source device that obtains, when lighting primary source 21 usefulness visualization light-emitting areas, observing on the directions X becomes the bright band that be higher than other parts for 30mm with the brightness in the interior zone apart from light conductor light-incident end 233, and luminance uniformity is low.
[table 2]
| Embodiment 5 | | Embodiment 11 | Comparative example 7 | Comparative example 8 | |
| Average slope angle θ a (°) | 8.6 | 5.0 | 11.0 | 2.9 | 18.0 |
| The pitch angle reaches for 20 ° | 18.0 | 12.0 | 22.0 | 16.0 | 55.0 |
| The component that it is above have a ratio (%) | |||||
| Ra (micron) | 0.26 | 0.21 | 0.28 | 0.15 | 0.48 |
| Rz (micron) | 1.03 | 0.90 | 1.40 | 0.68 | 2.10 |
| Quality (Luminance Distribution) | Well | Well | Well | Light-incident end is obfuscation nearby | Light-incident end is nearby bright |
| Quality (unusual light outgoing) | Do not have | Do not have | Almost do not have | Have | Do not have |
Claims (17)
1. the planar light source device of an end face irradiation mode is with the manufacture method of light conductor, described light conductor guiding is from the light of primary source emission, and have the light-emitting face that allows from the light-incident end of the light incident of described primary source emission and allow the light outgoing that guided, it is characterized in that
Adopting the material that is formed by translucent synthetic resin as the material of described light conductor, is to be that 8 ° and following lathe tool carry out cut and finish more than or equal to 3 ° smaller or equal to 4.5 ° and anterior angle by using relief angle.
2. the planar light source device of end face irradiation mode according to claim 1 is characterized in that with the manufacture method of light conductor, the anterior angle of described lathe tool be 3 ° and more than.
3. the planar light source device of end face irradiation mode according to claim 1 is characterized in that with the manufacture method of light conductor, the radius-of-curvature of the front end of described lathe tool be 1.5 microns and more than, 6 microns and below.
4. use the manufacture method of light conductor according to the planar light source device of each described end face irradiation mode in the claim 1～3, it is characterized in that, described lathe tool is as the polycrystalline diamond stone granulate of bonded-abrasive use sintering.
5. the planar light source device of end face irradiation mode according to claim 4 is characterized in that with the manufacture method of light conductor the polycrystalline diamond stone granulate of described sintering is 0.3 micron of mean grain size and above, 30 microns and following particle.
6. lathe tool, be when the planar light source device of making end face irradiation mode is used light conductor, the lathe tool that uses in the cut of described light-incident end, described light conductor guiding is from the light of primary source emission, and has a light-emitting face that allows from the light-incident end of the light incident of described primary source emission and allow the light outgoing that guided, and form by translucent synthetic resin, it is characterized in that
Relief angle is 3 ° and above 4.5 ° and following, and anterior angle is 8 ° and following.
7. lathe tool according to claim 6 is characterized in that, anterior angle be 3 ° and more than.
8. lathe tool according to claim 6 is characterized in that, the radius-of-curvature of front end be 1.5 microns and above 6 microns and below.
9. according to each described lathe tool in the claim 6～8, it is characterized in that, use the polycrystalline diamond stone granulate of sintering as bonded-abrasive.
10. lathe tool according to claim 9 is characterized in that, the polycrystalline diamond stone granulate mean grain size of described sintering be 3 microns and more than, 30 microns and below.
11. planar light source device light conductor, be the light of guiding from the primary source emission, and have the light conductor at the back side of the light-emitting face that allows from the light-incident end of the light incident of described primary source emission and allow the light outgoing that guided and opposition side thereof, it is characterized in that
The angle that described light-incident end and the described back side constitute be 89.4 ° and more than, 91 ° and following,
Described light-incident end, its average slope angle that utilizes on about thickness direction of the described light conductor that super degree of depth measuring shape measurement microscope obtains be 3 ° and more than, 12 ° and following.
12. planar light source device light conductor according to claim 11, it is characterized in that, described light-incident end, its utilize 20 ° at the number of degrees distribution medium dip angle at the pitch angle that super degree of depth measuring shape measurement microscope obtains and above composition thereof exist ratio be 40% and below.
13. planar light source device light conductor according to claim 11, it is characterized in that, described light-incident end, its center line average boldness Ra that utilizes the thickness direction of the described light conductor that super degree of depth measuring shape measurement microscope obtains be 0.2 micron and more than, 0.4 micron and below.
14. planar light source device light conductor according to claim 11, it is characterized in that, described light-incident end, its 10 average boldness Rz that utilize the thickness direction of the described light conductor that super degree of depth measuring shape measurement microscope obtains be 0.7 micron and more than, 2 microns and below.
15. according to each described planar light source device light conductor in the claim 11～14, it is characterized in that described light-incident end is asperities, possess the lens arrays that comprises curve at a plurality of lens arrays of extending in parallel to each other on the direction vertical with the thickness direction of described light conductor and its section shape forms face or possess a plurality of lens arrays of extending in parallel to each other and at least a portion of this lens arrays is carried out asperitiesization and the asperities lens arrays that forms forms face on the direction vertical with the thickness direction of described light conductor.
16. planar light source device light conductor according to claim 11 is characterized in that described light-emitting face is formed by asperities.
17. planar light source device light conductor according to claim 11 is characterized in that, the described back side be possess with the direction of described light-incident end approximate vertical on the lens arrays of a plurality of lens arrays of extending in parallel to each other form face.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004296353 | 2004-10-08 | ||
| JP2004296350A JP2006108032A (en) | 2004-10-08 | 2004-10-08 | Light guide body for surface light source, its manufacturing method as well as surface light source device |
| JP2004296350 | 2004-10-08 |
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| Publication Number | Publication Date |
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| CN1758109A true CN1758109A (en) | 2006-04-12 |
| CN100501520C CN100501520C (en) | 2009-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101135435A Expired - Fee Related CN100501520C (en) | 2004-10-08 | 2005-10-08 | Guide body for surface light device and processing method as well as turning tool used by the method |
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| JP (1) | JP2006108032A (en) |
| CN (1) | CN100501520C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103551593A (en) * | 2013-10-22 | 2014-02-05 | 上海现代先进超精密制造中心有限公司 | Method for machining asymmetrical large-rise-fall workpiece |
| CN110133794A (en) * | 2019-05-30 | 2019-08-16 | 开平市盈光机电科技有限公司 | A kind of production technology of light guide plate incidence surface optical microstructures |
| CN110587670A (en) * | 2019-10-14 | 2019-12-20 | 浙江舜宇光学有限公司 | Shearing blade for plastic lens gate |
| CN112296362A (en) * | 2019-07-24 | 2021-02-02 | 雷斯工程株式会社 | Method for manufacturing vehicle wheel |
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| JP2007299572A (en) * | 2006-04-28 | 2007-11-15 | Mitsubishi Rayon Co Ltd | Surface light source device using optical mixing means |
| JP2008043627A (en) * | 2006-08-21 | 2008-02-28 | Active Inc | Transmissive lcd device, game machine, display device |
| JP4656176B2 (en) | 2008-04-11 | 2011-03-23 | ソニー株式会社 | Light guide plate, display device, and electronic device with display |
| JP5391798B2 (en) * | 2009-04-14 | 2014-01-15 | 凸版印刷株式会社 | Backlight unit and display device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100407101B1 (en) * | 1995-10-12 | 2004-02-18 | 인터내셔널 비지네스 머신즈 코포레이션 | Light-transmitting material, planar light source device and liquid crystal display device |
| FR2751759B1 (en) * | 1996-07-24 | 1998-09-11 | Schneider Electric Sa | INTEGRATED OPTICAL DEVICE WITH ACTIVE AND PASSIVE GUIDANCE ZONES |
| JP3520494B2 (en) * | 1998-05-11 | 2004-04-19 | 日東電工株式会社 | Reflective liquid crystal display |
| JP2000214334A (en) * | 1999-01-20 | 2000-08-04 | Ohtsu Tire & Rubber Co Ltd :The | Light transmission plate for backlight and backlight |
| JP3969214B2 (en) * | 2002-06-28 | 2007-09-05 | カシオ計算機株式会社 | Lighting panel and display device using the same |
| CN1742179A (en) * | 2003-01-29 | 2006-03-01 | 三菱丽阳株式会社 | Area light source |
-
2004
- 2004-10-08 JP JP2004296350A patent/JP2006108032A/en active Pending
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2005
- 2005-10-08 CN CNB2005101135435A patent/CN100501520C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551593A (en) * | 2013-10-22 | 2014-02-05 | 上海现代先进超精密制造中心有限公司 | Method for machining asymmetrical large-rise-fall workpiece |
| CN110133794A (en) * | 2019-05-30 | 2019-08-16 | 开平市盈光机电科技有限公司 | A kind of production technology of light guide plate incidence surface optical microstructures |
| CN112296362A (en) * | 2019-07-24 | 2021-02-02 | 雷斯工程株式会社 | Method for manufacturing vehicle wheel |
| CN110587670A (en) * | 2019-10-14 | 2019-12-20 | 浙江舜宇光学有限公司 | Shearing blade for plastic lens gate |
Also Published As
| Publication number | Publication date |
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| CN100501520C (en) | 2009-06-17 |
| JP2006108032A (en) | 2006-04-20 |
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