CN100347567C - Light deflector and light source device - Google Patents
Light deflector and light source device Download PDFInfo
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- CN100347567C CN100347567C CNB2003801050915A CN200380105091A CN100347567C CN 100347567 C CN100347567 C CN 100347567C CN B2003801050915 A CNB2003801050915 A CN B2003801050915A CN 200380105091 A CN200380105091 A CN 200380105091A CN 100347567 C CN100347567 C CN 100347567C
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Abstract
An area light source device comprises a primary light source (1), a light guide (3) having a light input surface (31) on which light emitted from the primary light source (1) is incident and a light output surface (33) for guiding the incident light and outputting the guided light, and a light deflector opposed to the light guide output surface. The light deflector (4) has a light input surface (41) to which light is inputted and a light output surface (42) which is disposed on the opposite side of the light input surface and outputs the inputted light. Prisms each having two prism faces are parallel arranged on the light input surface (41). At least one of the two prism faces is a non-single planar surface. The vertex split angle alpha of one of the prism faces is 2 to 25 degrees, and the vertex split angle beta of the other face is 33 to 40 degrees. The difference (||alpha-beta||) between the vertex split angle alpha and the vertex split angle beta is 8 to 35 degrees. As a result, the output light distribution is controlled and narrowed. Thus, a light source device having an improved ratio of utilization of the amount of light from the primary light source, a simplified structure, and an improved image definition is produced.
Description
Technical field
The present invention relates to constitute in notebook computer, liquid crystal TV set, portable phone, the portable information terminal device etc. the light supply apparatus of edge light mode of the liquid crystal indicator that uses as display unit etc. and the light deflection element that is used for this device, particularly relate to the improvement of light deflection element of the light emergence face side of the light conductor that is disposed at light supply apparatus.
Background technology
In recent years, color liquid crystal display arrangement is as the monitor of portable notebook computer and PC etc., or, be used widely in various fields as the display unit of liquid crystal TV set, the integrated type liquid crystal TV set of video, portable phone, portable information terminal device etc. always.And along with the variation of the increase of information processing capacity, demand and corresponding with multimedia etc. needs, the big pictureization and the high definitionization of liquid crystal indicator develop.
Liquid crystal indicator is made of back light unit and liquid crystal display cells unit basically.Back light unit has the back light unit of mode under configuration primary source under the liquid crystal display cells unit and relatively disposes the back light unit of the edge light mode of primary source with the side end face of light conductor, from making the purpose of liquid crystal indicator compactness, adopt the edge light mode more.
But, in recent years, as the less display device of picture dimension, the liquid crystal indicator that uses as the narrow portable phone display unit of direction of observation scope etc. for example, from reducing the target of power consumption, in order effectively to utilize the light quantity of sending from primary source, adopt the diffusion angle of dwindling the light beam that from picture, penetrates as far as possible as the back light unit of edge light mode, make the light of ejaculation concentrate on the structure of needed angular range.
Display device as such qualification direction of observation scope, promptly for the utilization ratio of the light quantity that improves primary source, reduce power consumption, concentrate on the irradiant light supply apparatus of narrow scope, open in the 2001-143515 communique the Jap.P. spy, disclose the light emergence face of contiguous light conductor, used on two faces, to have the technical scheme that prism forms the prismatic lens of face.This two sides prismatic lens, one face are that incidence surface and another face are to form a plurality of prism row that are parallel to each other on the exiting surface respectively, make the prism column direction consistent at incidence surface and exiting surface, and the prism row are disposed on the corresponding position each other.Make from the light emergence face of light conductor to the direction that tilts with respect to this light emergence face with this, have peak value that penetrates light and the light that penetrates at suitable angular range with distributing, can inject from a prism facets of the incidence surface of prismatic lens, be subjected to the inside surface reflection in another prism facets, make its refraction action that is subjected to the prism of exiting surface again, in narrow desired direction set, penetrate light.
But, adopt such light supply apparatus, though can concentrate on narrow angular range penetrates, but, as the prismatic lens that uses to light deflection element,, must make the prism column direction consistent at incidence surface and exiting surface for two sides a plurality of prism row parallel to each other, and the prism row of inciting somebody to action each other are configured in correspondence position, moulding more complicated like this.
In Japanese kokai publication hei 10-254371 communique, the tilt angle alpha that constitutes a face of prism row adopts 4.7～5.7 °, the inclination angle beta of another side adopts 34.2～35 °, seek to improve the briliancy of normal direction with this, but, because another face adopts the plane, can not obtain effect of sufficient.
Flat 9-507584 communique of Japanese Unexamined Patent Application Publication (international open WO94/20871 communique) and special opening disclose the prismatic lens that a face that constitutes the prism row adopts convex surface or concave curved surface in the flat 9-105804 communique.Again, the spy open disclose in the 2002-197908 communique constitute the prism row a face by a plurality of planes or the prismatic lens that convex surface constitutes.But, in these communiques, be set at special relation to seek to improve the not record of performance of the light supply apparatus that uses prismatic lens for the angle of inclination of a face that will constitute the prism row and the angle of inclination of another face.
Summary of the invention
The objective of the invention is, provide and to be controlled to the distribution of penetrating light very narrow, the utilization ratio of the light quantity of raising primary source (promptly, make the light that sends from primary source concentrate on the efficient raising that desired direction of observation penetrates), and easy light deflection element and the light supply apparatus that improves picture quality with simple structure.
According to the present invention, provide such light deflection element to realize above-mentioned purpose, promptly it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make and inject the exiting surface that light penetrates, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, and described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °.In the present invention, so-called non-single plane is meant the face face in addition that is made of single plane.
In a kind of form of the present invention, described top portion supporting role α is 11～25 °.
In a kind of form of the present invention, a face of described two prism facets is made of non-single plane, and another face is made of single plane.
In a kind of form of the present invention, described non-single plane is made of at least one convex surface.
In a kind of form of the present invention, described non-single plane is made of mutually different two or more planes, pitch angle, or constitute, or constitute by one or more plane and one or more convex surface by the mutually different two or more convex surfaces in pitch angle.In a kind of form of the present invention, described non-single plane is positioned near described plane or its pitch angle of described convex surface of described exiting surface one side big more.
In a kind of form of the present invention, in the described non-single plane, the pitch angle of the face at the top of the most approaching described prism row and the difference at the pitch angle of the face of approaching described exiting surface be 1～15 °.In a kind of form of the present invention, the photodistributed peak value direction of the ejaculation of light on described each face that penetrates from described exiting surface after total reflection on each face of described plane that constitutes described non-single plane and/or described convex surface is the roughly normal direction that forms the plane of described prism row.
In a kind of form of the present invention, constitute the convex surface of described non-single plane, its radius-of-curvature r and the ratio r/P of the spacing P of described prism row are 2～50.In a kind of form of the present invention, the ultimate range d of described non-single plane and the imaginary plane of top that is connected described prism row and bottom, with the ratio d/P of the spacing P of described prism row be 0.4～5%.
In a kind of form of the present invention, described prism row, coordinate with the summit on its cross section is an initial point, the length standard of the spacing P of described prism row turns at 1 o'clock, by tie point 1 (0.111,1.27), point 2 (0.0,0.0), point 3 (0.159,0.195), point 4 (0.212,0.260), point 5 (0.265,0.328), point 6 (0.319,0.398), point 7 (0.372,0.470), point 8 (0.425,0.544), point 9 (0.478,0.621), point 10 (0.531,0.699), point 11 (0.584,0.780), point 12 (0.637,0.861), point 13 (0.690,0.945), point 14 (0.743,1.030), point 15 (0.796,1.117), point 16 (0.889,1.27) these 16 points or its shape of nearby putting formation.
In a kind of form of the present invention, described prism row, coordinate with the summit on its cross section is an initial point, the length standard of the spacing P of described prism row turns at 1 o'clock, by tie point 1 (0.206,1.168), point 2 (0.000,0.000), point 3 (0.159,0.204), point 4 (0.212,0.273), point 5 (0.265,0.343), point 6 (0.319,0.416), point 7 (0.372,0.490), point 8 (0.425,0.567), point 9 (0.478,0.646), point 10 (0.531,0.727), point 11 (0.584,0.810), point 12 (0.637,0.897), point 13 (0.794,1.168) these 13 points or its shape of nearby putting formation.
In a kind of form of the present invention, described prism row, coordinate with the summit on its cross section is an initial point, the length standard of the spacing P of described prism row turns at 1 o'clock, by tie point 1 (0.284,1.059), point 2 (0.000,0.000), point 3 (0.212,0.278), point 4 (0.265,0.350), point 5 (0.319,0.423), point 6 (0.372,0.501), point 7 (0.425,0.581), point 8 (0.478,0.663), point 9 (0.531,0.748), point 10 (0.584,0.834), point 11 (0.637,0.922), point 12 (0.716,1.059) these 12 points or its shape of nearby putting formation.
In a kind of form of the present invention, described prism row, the length standard of the spacing P of the above prism row turns at 1 o'clock in its cross section, at least 5 points that go out from described 16 points, 13 or 12 point selection are that radius centered is that the shape that the described nearby point in 0.021 the circle connects constitutes by being in these points.
In a kind of form of the present invention, in the section shape of the spacing P of described prism row and the described prism facets that constitutes the top portion supporting role β that described prism is listed as, be connected the length L 2 of the imaginary line of prism top and paddy portion, satisfy the relation of L2/P=1.1～1.7.In a kind of form of the present invention, the length L 1 that connects the imaginary line of prism top and paddy portion in the section shape of the described prism facets of top portion supporting role α, length L 2 with being connected the imaginary line of prism top and paddy portion in the section shape of the described prism facets of top portion supporting role β satisfies the relation of L2/L1=1.1～1.3.
In a kind of form of the present invention, constitute the crest line that two prism facets of described prism row form, turn at 1 o'clock at the length standard of the spacing P of described prism row, form 0.018～0.354 concaveconvex shape with respect to its datum line.In a kind of form of the present invention, constitute two prism facets of described prism row, turn at 1 o'clock at the length standard of the spacing P of described prism row, form 0.012～0.334 concaveconvex shape with respect to its reference field.
In a kind of form of the present invention, between the adjacent prism row par is set.In a kind of form of the present invention, described par is arranged at from prism valley on 2～10 microns position on the short transverse of prism row.In a kind of form of the present invention, described par turns at 1 o'clock at the length standard of the spacing P of described prism row, is arranged at from prism valley on 0.035～0.18 position on the short transverse of prism row.In a kind of form of the present invention, the length L 2 that connects prism top and the imaginary line of prism valley in the section shape of the described prism facets of top portion supporting role β is standardized as at 1 o'clock, and described par is arranged at from prism valley on 0.022～0.16 position on the short transverse that prism is listed as.
According to the present invention, provide such light deflection element to realize above-mentioned purpose, promptly it is characterized in that, have and make the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange a plurality of prism row that constitute by two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, two crest lines that prism facets forms, length standard at the spacing P of described prism row turns at 1 o'clock, forms 0.018～0.354 concaveconvex shape with respect to its reference field.
According to the present invention, provide such light deflection element to realize above-mentioned purpose, promptly it is characterized in that, have and make the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange a plurality of prism row that constitute by two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, two prism facets turn at 1 o'clock at the length standard of the spacing P of described prism row, form 0.012～0.334 concaveconvex shape with respect to its reference field.
Also have,, provide such light deflection element to realize above-mentioned purpose, promptly it is characterized in that possessing: secondary light source according to the present invention; The light that has the light that sends from this light source to inject is injected face and the light that guiding injects is arranged and the light conductor of the light emergence face that the light that makes guiding penetrated; And the described light deflection element that disposes opposed to each other of the described light emergence face that makes described incidence surface and this light conductor.
In a kind of form of the present invention, described light deflection element, the described prism facets of the top portion supporting role α of its prism row is disposed at the side near described primary source, and the described prism facets of the top portion supporting role β of its prism row is disposed at the side away from described primary source.
In a kind of form of the present invention, described primary source is near the configuration of the corner portions located of described light conductor, and the prism of described light deflection element row to show described primary source greatly be center configuration is concentric circles roughly.
In a kind of form of the present invention, have the light diffusion element with the exiting surface disposed adjacent of described light deflection element, the photodistributed halfwidth degree of the ejaculation of this light diffusion element when directional light is injected has anisotropy.
Description of drawings
Fig. 1 is the schematic isometric of expression light supply apparatus of the present invention.
Fig. 2 is the key diagram of shape of prism row of the incidence surface of light deflection element of the present invention.
Fig. 3 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Fig. 4 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Fig. 5 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Fig. 6 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Fig. 7 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Fig. 8 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Fig. 9 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Figure 10 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Figure 11 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Figure 12 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Figure 13 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Figure 14 is the various ejaculations photodistributed key diagram of expression from light deflection element.
Figure 15 is that expression is because the light refraction that the difference at the pitch angle of prism facets causes and the different key diagram of prism length profile.
Figure 16 is that expression is because the light refraction that the difference at the pitch angle of prism facets causes and the different key diagram of prism length profile.
Figure 17 is the key diagram of shape of prism row of the incidence surface of light deflection element of the present invention.
Figure 18 will be roughly the stereographic map of the corner portions located disposed adjacent of point source of light and light conductor.
Figure 19 is the key diagram that penetrates photodistributed halfwidth degree.
Figure 20 is the key diagram of shape of prism row of the incidence surface of light deflection element of the present invention.
Preferred forms
With reference to the accompanying drawings example of the present invention is described.
Fig. 1 is the schematic isometric of an example of expression light supply apparatus of the present invention.As shown in Figure 1, the planar light source device of the invention of this example is by constituting with lower member, that is: at least with a side end face as light inject face 31, with a surface of its approximate vertical light conductor 3 as light emergence face 33; Wire that inject the relative configuration of face 31 with the light of this light conductor 3, covers with light source reflector 2 or bar-shaped primary source 1; Be disposed at light deflection element 4 and configuration light diffusion element 6 thereon on the light emergence face 33 of light conductor 3; And with the light reflection element 5 of the back side 34 relative configurations of the light emergence face 33 opposite sides of light conductor 3.
Two interareas injecting face 31 approximate vertical with the light of light conductor 3 are in respectively the position with XY face almost parallel, and any one face becomes light emergence face 33 (being upper surface among the figure).To at least one face in the back side 34 of this light emergence face 33 or an opposite side with it, give the directive property light that constitutes by rough surface and penetrate function portion, or inject the directive property light ejaculation function portion that lens face that face 31 almost parallel ground form side by side constitutes by multiple lens arrays such as prism row, biconvex lens row, V font groove and light, guide in light conductor 3 with this and to inject the light that face 31 is injected, make simultaneously and have the light of directive property to penetrate during ejaculation light in light is injected the vertical face (XZ face) of face 31 and light emergence face 33 distributes from light emergence face 33 from light.The angle that photodistributed peak value direction of ejaculation that distributes in this XZ face and light emergence face 33 form is designated as a, and this angle a preferably adopts 10～40 °, penetrates preferably 10～40 ° of photodistributed halfwidth degree.
Uneven surface or lens arrays that light conductor 3 surface forms, according to IS04287/1-1984, it evenly is favourable for seek briliancy in light emergence face 33 that average slope angle θ a gets 0.5～15 ° scope.The more satisfactory scope of average slope angle θ a is 1～12 °, and more desirable scope is 1.5～11 °.The optimum range of this average slope angle θ a is preferably set according to the thickness t of the light conductor 3 ratio L/t with the length L of injecting the direction that light propagates.That is light conductor 3 use L/t surpass 20 but under the situation less than 200 size, make average slope angle θ a be 0.5～7.5 ° for good, 1～5 ° of scope is then desirable more, 1.5～4 ° of scopes are ideal.Again, light conductor 3 uses under the situation of L/t less than 20 size, make average slope angle θ a be 7～12 ° for good, 8～11 ° of scopes are then desirable more.
The average slope angle θ a that forms the uneven surface of light conductor 3 can be according to IS04287/1-1984, use the contact pin type surfagauge to measure the shape of uneven surface, coordinate with the mensuration direction is x, utilizes following formula (1) and formula (2) to obtain from the slant function f (x) that obtains.Here, L is a measured length, and-a is the tangent of average slope angle θ a.
Δa＝(1/L)∫
0 1|(d/dx)f(x)|dx ……(1)
θa＝tan
-1(Δa) ……(2)
Also have, light conductor 3, its light ejaculation rate is that 0.5～5% scope is good, better is 1～3% scope.This be because, if light ejaculation rate is less than 0.5%, then the light quantity that penetrates from light conductor 3 is few, tend to obtain sufficient briliancy, if light ejaculation rate is greater than 5%, then a large amount of light that nearby has at primary source 1 penetrates, light emergence face 33 in the decay of the light of directions X remarkable, have to descend in the briliancy homogeneity of light emergence face 33 and be inclined to.Like this, the light ejaculation rate of light conductor 3 adopts 0.5～5%, can make the angle (peak value angle) of the photodistributed peak light of ejaculation of the light that penetrates from light emergence face be in 50～80 ° scope with respect to the normal of light emergence face, make the light that penetrates ejaculation characteristic from light conductor 3 with high directivity, promptly injecting the photodistributed halfwidth degree of ejaculation on the XZ face of face and light emergence face perpendicular to light is 10～40 ° high directivity light, can make it penetrate direction deflection effectively with light deflection element 4, the planar light source device with high briliancy can be provided.
In the present invention, from the light ejaculation rate definition as described below of light conductor 3.The light of light emergence face 33 is injected the light intensity (I of ejaculation light of the ora terminalis of face 31 1 sides
n) ora terminalis of injecting face 31 1 sides with the light relation that plays the locational ejaculation light intensity (l) of distance L satisfies following relational expression (3), wherein t represents the thickness (size of Z direction) of light conductor 3.
l＝l
0·A(1-A) ……(3)
Here, constant A is a light ejaculation rate, is the ratio (%) of injecting the light that the light conductor 3 of the per unit length (length that is equivalent to the light conductor thickness t) of the vertical directions X of face 31 penetrates in light emergence face 33 with light.Expression is represented L/t from the logarithm of the light intensity of the ejaculation light of light emergence face 23 on transverse axis on the longitudinal axis, makes its relation curve, and this light ejaculation rate A obtains from its slope.
Again, on other interareas that do not form directive property light ejaculation function portion, in order to control, preferably to form and to go up the lens face that a plurality of lens arrays of extending are arranged in the direction (directions X) of injecting face 31 approximate vertical with light from the ejaculation light of light conductor 3 directive property on the face (YZ face) parallel with primary source 1.In example shown in Figure 1, light emergence face 33 forms uneven surfaces, forms on 34 overleaf towards injecting a plurality of lens arrays that the direction (directions X) of face 31 approximate vertical extends with light and arranges the lens face that constitutes.In the present invention also can be opposite with form shown in Figure 1, on light emergence face 33, form lens face, uneven surface is adopted at the back side 34.
As shown in Figure 1, forming on the back side 34 of light conductor 3 or the light emergence face 33 under the situation of lens arrays, this lens arrays can be enumerated the prism row that for example roughly extend, biconvex lens row, V font groove etc. on directions X, but preferably adopts the shape of YZ section to be roughly leg-of-mutton prism row.
Under the situation that forms such prism row, preferably its drift angle adopts the angle of 70～150 ° of scopes.This is because can fully the ejaculation light from light conductor 3 be focused on by drift angle being chosen as this scope, can seek fully to improve the briliancy of planar light source device.That is to say, by prism vertex angle being chosen to be this scope, comprise and penetrate the peak light of light in distributing, can penetrate and penetrate photodistributed halfwidth degree on perpendicular to the face of XZ face is ejaculation light after 35～65 ° the focusing, can improve the briliancy as surface light source element.Also have, the prism row are being formed under the situation of light emergence face 33, drift angle preferably adopts 80～100 ° scope, and the prism row are being formed under the situation at the back side 34, and drift angle preferably adopts 70 °～80 ° scopes or 100 °～150 ° scopes.
Also have, in the present invention, also can sneak into the optical diffuse microparticle in light conductor inside and make its diffusion, give its directive property light with this and penetrate function, replace method or both and the usefulness that forms light ejaculation function portion on aforesaid light emergence face 33 or its back side 34 with this.Again, be not limited to section shape shown in Figure 1 as light conductor 3, also can use have wedge-type shape, the light conductor of different shape such as ship shape shape.
Fig. 2 is the key diagram of the shape of the prism row in the explanation light deflection element 4.Light deflection element 4 with one of first type surface as incidence surface 41, with another side as exiting surface 42.Arrange a plurality of prism row on the incidence surface 41 side by side, each prism is listed as by the 1st prism facets 44 that is positioned near the light source side position and constitutes with the 2nd prism facets 45 these two prism facets that are positioned at the position of departing from light source side.In the example shown in Figure 2, the 1st prism facets 44 is planes, and the 2nd prism facets 45 is non-single planes that different plane 46～48,3 mutual pitch angle constitutes, and these 3 planes are big more near its pitch angle, plane of exiting surface 42.Also have, in the present invention, the pitch angle of the face of prism row is meant the angle of inclination that forms each face on plane 43 with respect to the prism row.
The top portion supporting role α of the 1st prism facets 44 of light deflection element 4 adopts 2～25 °, the top portion supporting role β of the 2nd prism facets 45 adopts 33～40 °, the absolute value of the difference of α and β | alpha-beta | adopt 8～35 °, can bring into play high spotlight effect like this, light supply apparatus can be realized high briliancy.Also have, in the present invention, so-called top portion supporting role α, β, be meant prism row drift angle form branch supporting role about the normal on plane 43 with respect to the prism row, the top of the 1st prism facets 44 and prism row are formed the angle that the normal direction on plane 43 forms be designated as α, the top of the 2nd prism facets 45 is designated as β with the angle that the prism row form the normal direction formation on plane 43.And, utilize and be positioned near two or more big more formation prism facets of the face tilt angle of exiting surface 42 1 sides, make total reflection on each face, the peak value angle of the light that penetrates from exiting surface 42 is consistent on all faces, can access high briliancy like this.At this moment, near the face of exiting surface with away from the difference at its pitch angle of face of exiting surface in 1 °～15 ° scopes, more satisfactory is in 5～12 ° of scopes, better is in 7～10 ° of scopes.Again, by such formation the 2nd prism facets 45, design has the light deflection element of desirable optically focused easily, also can stablize simultaneously and make the light deflection element with certain optical characteristics.
Formation and function to the prism facets of light deflection element of the present invention further describes in detail below.Fig. 3～Figure 12 represents, two prism facets all are made of single plane, with respect to the exiting surface normal direction, difference angulation α and β (corresponding to top portion supporting role α and the β among the present invention), and with respect to the normal direction balanced configuration of exiting surface, for the drift angle of prism is the existing light deflection element of 65.4 ° (α=β=32.7 °), 20 ° light from the photodistributed peak value angle of the ejaculation of light conductor with respect to light emergence face, on the plane of injecting face and these two faces of light emergence face perpendicular to the light of light conductor, what kind of penetrates the light distribution with penetrate from light deflection element.Fig. 3～Figure 12 represents to inject light by the 2nd prism facets total reflection by what the 1st prism facets was injected, and the state that penetrates from exiting surface 42, and the 2nd prism facets evenly is divided into 10 zones on the x direction is from the distribution of the ejaculation light in each zone.10 zones from the side near the prism top be designated as in regular turn part 1, part 2 ..., part 10.In being distributed by the ejaculation light of whole light of the 2nd prism facets total reflection, ejaculation, as shown in figure 13, its peak light penetrates to the normal direction that the prism row form the plane, has 22 ° halfwidth degree.
But, observe part 1, part 2 ..., part 10 each zone ejaculation light distribute as seen, this peak value angle part 1 and part 2 to approximately-9 ° (the negative angle value representation is 0 ° with normal direction, be partial to the situation of light source direction) near the ejaculation, in part 3～part 7, peak light changes to 0 ° of direction (the prism row form the normal direction on plane) in regular turn, and in part 8～part 10, peak light changes to positive angle direction in regular turn.In the peak value angle near the ejaculation light of zone (part 10) total reflection of exiting surface 42 is 7 °.The peak value angle has 16 ° expansion between each zone of the 2nd prism facets (part 1～part 10).And 10 slowly diminish from part 1 to part from each regional peak value light intensity.
Like this, the light that penetrates after the prism facets total reflection that is made of a plane as can be known depends on the zone of the total reflection of prism facets, in sizable scope diffusion.By adjusting the pitch angle of each regional face respectively, making peak light in the distribution of the ejaculation light that each zone comes is roughly the same direction in all regional peak value angles when penetrating, and can make most of light that penetrates concentrate on the specific direction and penetrate like this.At this moment, make the pitch angle of each regional prism facets, big more near this pitch angle of face in the zone of exiting surface 42, that is, 10 become big in regular turn from part 1 to part.Like this, by adjusting the pitch angle of each regional face, can as shown in figure 14 the ejaculation light of whole prism facets total reflection be concentrated on certain direction.Can penetrate the big light of directive property height and peak strength.The present invention makes according to such imagination.
But, not many in the light quantity that the 2nd prism facets 45 receives under the situation of top portion supporting role α=32.7 of the 1st prism facets 44 °, so the raising of peak strength is limited.Therefore be 2～25 ° by getting α, can increase the light quantity of shining in the 2nd prism facets 45, consequently, peak strength also is increased.This be because, compare with Figure 15, the refraction effect in the 1st prism facets 44 is big as shown in figure 16, and by adjusted size, makes prism that identical spacing be arranged, and can make the length on the section shape of prism facets 45 elongated like this.For example, as shown in figure 16, be 5 ° if set α, β is 38 °, then as shown in figure 15, compares with the situation of α=β=32.7 °, can receive 1.29 times light quantity in the 2nd prism facets 45.Like this, reduce α and can increase the light quantity of shining in prism facets 45, if but the 2nd prism facets 45 is single planes, the light that then can not make total reflection is expeditiously roughly towards normal direction.Therefore be necessary with on-plane surface, for example curved surface, and/or several of persons, for example plane constitute.
If the number in the zone of the 2nd prism facets 45 is many, then can be on whole of prism facets the careful peak value angle of adjusting, can improve the degree of concentration that penetrates light on the whole.But must form different plane, angle of inclination finely, be used to form the design of the blade (bite) that the metal cutting of the prism facets of light deflection element uses and make and all become complicated, the light deflection element that also is difficult to stably obtain having certain optical characteristics simultaneously.Therefore the number that is formed at the zone of prism facets be chosen as 3～20 more satisfactory, it is desirable to 4～15 more.Preferably this prism facets is divided into a plurality of zones and the time can evenly cuts apart, but also necessarily equalization cut apart, can adjust according to the desirable ejaculation light distribution of whole prism facets.
The α value adopts 2～25 °, more satisfactory is 5～25 °, particularly 11～25 °, it is desirable to 11～20 ° more, optimal scope is 12～15 °, the β value adopts 33～40 °, more satisfactory is 33.5～39.5 °, it is desirable to 33.5～38 ° more, and optimal scope is 34～38 °, and the absolute value of the difference of α and β | alpha-beta | adopt 8～35 °, more satisfactory is 8～34.5 °, it is desirable to 13～27 ° more, and optimal scope is 19～23 °, the little then peak strength of α is big, is difficult towards normal direction roughly but make the peak value angle under the situation of α=0 °.If α does for a short time, in order to make the peak value angle roughly towards normal direction, prism vertex angle (alpha+beta) is also done for a short time, therefore has the tendency of making the difficulty that becomes, particularly lists optical defects such as forming scar and burr at prism easily when the moulding of prism row.Consider these existing problems, the cross sectional shape that α adopts more than 5 ° and the photodistributed peak value angle of the ejaculation of each face is roughly normal direction is ideal.On the other hand, if the α value is excessive, the inadequate tendency of spotlight effect is arranged then.If | alpha-beta | too small, α is increased, the inadequate tendency of spotlight effect is then arranged, if | alpha-beta | excessive, α is reduced, prism lists easy generation optical defect during moulding.
Concrete prism shape, have is initial point at the coordinate with prism apex for example, during the length standard of the spacing P of prism row, with (x, y) coordinate representation, tie point 1 (0.111,1.27), point 2 (0.0,0.0), point 3 (0.159,0.195), point 4 (0.212,0.260), point 5 (0.265,0.328), point 6 (0.319,0.398), point 7 (0.372,0.470), point 8 (0.425,0.544), point 9 (0.478,0.621), point 10 (0.531,0.699), point 11 (0.584,0.780), point 12 (0.637,0.861), point 13 (0.690,0.945), point 14 (0.743,1.030), point 15 (0.796,1.117), point 16 (0.889,1.27) shape that constitutes of 15 planes of the cross sectional shape of these 16 points.It also can be the shape that 11 planes of the cross sectional shape of tie point 1 (0.284,1.059), point 2 (0.000,0.000), point 3 (0.212,0.278), point 4 (0.265,0.350), point 5 (0.319,0.423), point 6 (0.372,0.501), point 7 (0.425,0.581), point 8 (0.478,0.663), point 9 (0.531,0.748), point 10 (0.584,0.834), point 11 (0.637,0.922), point 12 (0.716,1.059) these 12 points constitute.It can also be tie point 1 (0.206,1.168), point 2 (0.000,0.000), point 3 (0.159,0.204), point 4 (0.212,0.273), point 5 (0.265,0.343), point 6 (0.319,0.416), point 7 (0.372,0.490), point 8 (0.425,0.567), point 9 (0.478,0.646), point 10 (0.531,0.727), point 11 (0.584,0.810), point 12 (0.637,0.897), point 13 (0.794,1.168) shape that constitutes of 12 planes of the cross sectional shape of these 13 points.
16 points of above-mentioned cross sectional shape, 12 points and 13 needn't strictly pass through fully, are slightly offset nearby such situation of each point (promptly by) not big influence of intensity to peak value with these points.But, with the degree standardization of the spacing P of prism row the time, for 16 points, 12 or 13 at least 5 points, more satisfactory is, it is that radius centered is in 0.021 the circle that departing from of the coordinate of afore mentioned rules is in these points.Radius is better in 0.018 the circle, and preferably radius is in 0.014 the circle.Again, 8 to be in radius be the most desirable in 0.014 the circle.
In the present invention, as for example shown in Figure 17, at least one of the face with different pitch angle as described above of prism facets also can adopt convex surface, and also face that can be all adopts convex surface.That is to say, also can constitute prism facets, can constitute by the different convex surface more than 2 or 2 in pitch angle again by one or more plane and one or more convex surface.In Figure 17, the 2nd prism facets 45 is divided into 4 zones, constitute by 49,50 and two convex surfaces 51,52 in two planes.Convex surface 51 formation center in its cross sectional shape is the part of the circle of (5.025,4.389), radius R=6.669. convex surface 52 formation center in its cross sectional shape is the part of the circle of (6.672,5.537), radius R=8.677.Like this, in the situation that constitutes prism facets with a plurality of convex surfaces of different inclination angle, compare with the situation that the plane that utilizes different inclination angle constitutes, number of regions can be reduced to for example 2～10, and more satisfactory is 2～5.If but number of regions is too small, then be not easy for adjusting the design that each convex surface is carried out that distributes of desirable ejaculation light.Therefore number of regions adopts 3～4 ideals more.
Again, the shape of convex surface not only can be done its XY cross sectional shape circular, can also make non-circular.Also have, utilizing a plurality of convex surfaces to constitute under the situation of prism facets, preferably the shape of each convex surface is inequality, also can be that the cross section is that circular convex surface and cross section is non-circular convex surface combination.Non-circular shape has the part of a for example oval-shaped part, parabolic shape etc.
In the present invention, the pitch angle under the so-called convex surface situation is meant that the face (string that is equivalent to convex curve portion in the cross sectional shape) of the edges at two ends that connects convex surface forms the angle of inclination on plane 43 with respect to the prism row.Again, constitute at convex surface under the situation at top, top portion supporting role is meant that the face of the edges at two ends that connects convex surface forms the angle of the normal direction formation on plane 43 with respect to the prism row.
For the spacing P of prism row and the relation of the length L 2 of the paddy portion of the prism facets 45 of the top that is connected the prism row and this prism row, in order to be increased in the light quantity that prism facets 45 receives, the photodistributed peak value angle of ejaculation in each zone that makes the prism facets that constitutes the prism row is towards normal direction, make prism vertex angle (alpha+beta) not too small, L2/P=1.1～1.7 are proper.It is desirable to L2/P=1.16～1.6 more, it is desirable that item also want L2/P=1.27～1.56.Again, the length L 1 of the top of connection prism row and the paddy portion of this prism facets 44 and the relation of the length L 2 of the paddy portion of top that is connected the prism row and prism facets 45, L2/L1=1.1～1.3 are proper.It is desirable to L2/L1=1.13～1.25 more, it is desirable that also want L2/L1=1.16～1.22.
In the present invention, the digging angle of the prism valley of prism row is little.Therefore burr takes place easily to make in good time prism valley, and sometimes prism valley looks like the such defective of muscle.In order to prevent such defective, as shown in figure 20, preferably between adjacent prism row, par 59 is set.This par 59 as shown in the figure, 2～10 micron the position of prism valley on the short transverse of prism that is arranged at when never forming this par is more satisfactory, be arranged at 2.5～5 microns better, 3～4 microns position also will be got well.This position less than 2 microns situation under, make the Precision Machining difficulty relatively of cutting blade of the pattern-forming of this prism row, surpassing 10 microns then has the tendency that causes briliancy to descend.Again, the formation position of par, also can be 0.035～0.18 scope of prism valley on short transverse that when the length normalization of the spacing P of prism row, never forms under the situation of this par, also can be in the cross sectional shape of the prism facets of top portion supporting role β, when connecting length L 2 normalization of imaginary line of prism top and prism valley, from 0.022～0.016 the scope of prism valley on the short transverse of prism row.
2 formed crest lines of prism facets that constitute the prism row can be formed, when the length standard of the spacing P of prism row, with respect to the datum line (being positioned at the line of the average height of prism row) of crest line be 0.018～0.354 concavo-convex.Concavo-convex degree with respect to the datum line of crest line is advisable with 0.018～0.177, and more satisfactory is 0.018～0.088, and better is 0.035～0.063.This extremely concentrates in the light deflection element that penetrates at the present invention's light that works will inject to direction of observation, inject to liquid crystal display cells etc. by making near parallel light, utilization makes crest line form concavo-convex in the Z direction, can prevent the flash of light that when observing liquid crystal display cells, can find out, simultaneously can make the defective of light guide plate and light deflection element be not easy to find out, can reduce the inhomogeneous etc. of briliancy, play a part to upgrade.On the other hand, crest line is formed concavo-convex, just can between light guide plate and light deflection element, form plurality of gaps.Therefore the light that penetrates from the light guide plate prism row that shine the prism row of light source opposition side more rather than should shine when very close to each other, particularly penetrate light sometimes can not shine the prism row more to the light that penetrates near normal main reflecting surface (from the prism facets of a primary source side far away) than peak value from light conductor, in this case, might the overall briliancy of corresponding therewith minimizing.But concavo-convex owing to such crest line is made in light deflection element of the present invention, the share that the compensation briliancy descends is sought increasing substantially of briliancy, can prevent the decline of overall briliancy.But, can give full play to for the effect that makes light deflection element of the present invention, preferably the concavo-convex degree of crest line adopts above-mentioned scope.Making crest line form concavo-convex method is not particularly limited.The method etc. that for example can use the method that gives the lens-type shaping that specific vibration cuts on one side or use fine sandpaper very etc. to carry out grinding to the crest line portion of the lens unit of existing lens when cutting forms lens pattern forms.
Again, make 2 prism facets that constitute the prism row, when the length standard of the spacing P of prism row, for the reference field (face that comprises the center line on the datum line of crest line and the base of prism facets (limit of paddy portion side)) of prism facets form 0.012～0.334 concavo-convex, can crest line be made concavo-convex situation is the same seeks to upgrade with above-mentioned with this.Concavo-convex degree with respect to the prism reference field is good with 0.012～0.152, and more satisfactory is 0.012～0.076, it is desirable to 0.022～0.046 more.
Like this with light deflection element 4 mountings as described above on the light emergence face 33 of light conductor 3, make this prism row formation face become the incidence surface side, the directive property that can make the light emergence face 33 of light conductor 3 penetrate penetrate the ejaculation light of light in the XZ face distribute narrower, the high briliancyization that can seek light supply apparatus.That is to say, in the present invention, in the light supply apparatus of the prism row formation face of light deflection element 4 and the light emergence face 33 relative configurations of light conductor 3, make the shape optimization of the reflecting surface as interarea (away from the prism facets of primary source one side) of prism row, its length extends, when the angle of inclination that the light of setting prism row is simultaneously injected face (near the prism facets of a side of primary source) makes and injects the prism row from the ejaculation light of light conductor 3, make inject light can to the light emergence face 42 of light deflection element 4 away from the direction refraction, can suppress light to unwanted direction scattering with this, thereby improve the utilization ratio of light, light is penetrated in desirable direction set, can seek the great raising of light supply apparatus briliancy.
In the aforesaid light deflection element 4, when prism facets utilizes different a plurality of planes, angle of inclination or convex surface to constitute, in order to ensure sufficient optically focused characteristic, connect the top of prism row and the imaginary plane of bottom and the ultimate range d of a plurality of plane or convex surface (actual prism facets) and the ratio d/P of the spacing P that prism is listed as and preferably adopt 0.4～5%.This is that then the optically focused characteristic has the tendency of decline, can not fully improve briliancy because if d/P is lower than 0.4% or be higher than 5%, and 0.4～4.5% scope is more satisfactory scope, and better scope is 0.7～4.0% scope.Again, preferably the ratio r/P of the spacing P of its radius-of-curvature r and prism row is in 2～50 scopes for convex surface, and 5～30 scope is desirable more, and it is desirable that 6.5～12 scope is also wanted.This r/P is less than 2 or can not bring into play enough optically focused characteristics greater than 50, and briliancy has the tendency of reduction.
The photodistributed halfwidth degree of the ejaculation of ejaculation light in the XZ face that such light deflection element 4 penetrates is to be advisable below 25 degree more than 5 degree, and more satisfactory is 10～20 degree scopes, and better is 11～15 degree scopes.This is can eliminate the phenomenon that being difficult for of causing owing to the visual field is extremely narrow see image etc. clearly because make this penetrate photodistributed halfwidth degree in that 5 degree are above, and adopts 25 can seek high briliancyization below spending.
In the present invention, as shown in Figure 1, primary source 1 uses under the situation of linear light source, the prism row that are formed on the light deflection element 4 extend with primary source 1 almost parallel, or on the direction that tilts with respect to primary source 1 below 20 degree, extend, but the configuration that is formed at the prism row on the light deflection element 4 can be changed according to the direction of propagation of the light of propagating in light conductor 3 because of the difference of light source.For example, as shown in figure 18, at primary source 1 is led light source etc. to be roughly under the situation of locating to use in bight that the light source of point-like is disposed at light conductor 3 etc., the light of injecting light conductor 3 with light emergence face 33 same planes on show primary source 1 greatly and be center radial propagation in light conductor 3, the ejaculation light that penetrates from light emergence face 33 be the ejaculation of center radiation shape with primary source 1 too.For ejaculation light and its ejaculation orientation independent ground that can make radial like this ejaculation deflects into desirable direction expeditiously, preferably making the prism that is formed on the light deflection element 4 be listed as with the form that surrounds primary source 1 alignment arrangements roughly arranged side by side is arcuation.Like this, by making the prism row surround primary source 1 alignment arrangements roughly arranged side by side is arcuation, nearly all inject from the light of light emergence face 33 radial ejaculations to the prism row approximate vertical of light deflection element 4, therefore can make at the Zone Full of the light emergence face 33 of light conductor 3 and penetrate light directive specific direction expeditiously, can improve the homogeneity of briliancy.The prism row that are roughly arcuation that on light deflection element 4, form, preferably according to the degree of selected its arcuation of distribution of the light of in light conductor 3, propagating, from the light of light emergence face 33 radial ejaculations nearly all approximate vertical be injected into the prism row of light deflection element 4.Specifically, can enumerate that to be configured to point source of lights such as LED be the roughly concentric circles of approximate centre, the roughly radius of circular arc adds the side by side situation of configuration of the earth gradually, and the radius of prism row is according to the position relation and the size decision of the effective coverage of the position of the point source of light in the surface light source system and the area source suitable with liquid crystal display area.
With the side end face beyond such light source reflector 2 identical reflecting members also can be attached to the side end face 31 of light conductor 3.Light reflection element 5 for example can use the plastic sheet in surperficial evaporation metal reflection horizon.In the present invention, light reflection element 5 also can adopt and utilize reflection layer that evaporation metal etc. forms etc. at the back side 34 of light conductor 3, replaces reflector plate.
Light conductor 3 of the present invention and light deflection element 4 can constitute with the high synthetic resin of light transmission.Such synthetic resin has for example methacryl resin, acrylic resin, polycarbonate resin, vibrin, Corvic.Particularly, its light transmission height of methacryl resin, heat resistance, mechanical property, machine-shaping property excellence, the most suitable.Such methacryl resin is to be the resin of major component with the methyl methacrylate, preferably adopts the above material of methyl methacrylate content 80 weight %.When the surface structure of the surface structure of the uneven surface that forms light conductor 3 and light deflection element 4 and prism row etc., can adopt mold component to carry out hot-forming to the lucite plate with desirable surface structure, also can utilize screen printing, extrusion modling or ejection formation etc., give its shape simultaneously with moulding.Can utilize formation structural surfaces such as light and heat gel-type resin again.Also have, can be on the transparent bases such as the transparent membrane that constitutes such as resin or thin slice in vibrin, acrylic resin, polycarbonate resin, Corvic, polymethacrylimide (polymethacrylic imido), form uneven surface structure or the lens arrays arrangement architecture that active energy ray-curable resin constitutes on its surface, can utilize method such as bonding, welding that such thin slice is bonded on other transparent base in conjunction with the formation one again.The active energy ray-curable resin can use polyfunctional group (meta is inclined to one side) propen compounds, vinyl compound, (meta is inclined to one side) esters of acrylic acid, propenyl compound, (meta is inclined to one side) acrylic acid slaine etc.
Aforesaid primary source 1, light source reflector 2, light conductor 3, light deflection element 4, light reflection element 5, also have on the light-emitting area (exiting surface 42 of light deflection element 4 also has the surface of light diffusing member 6) of the planar light source device that light diffusing member 6 constitutes, constitute liquid crystal indicator by the configuration liquid crystal display cells.To liquid crystal indicator, the observer observes by liquid crystal display cells the top from Fig. 1.Again, in the present invention, can make the light of the narrow distribution of abundant collimationization inject liquid crystal display cells from planar light source device, therefore can access and in liquid crystal display cells, not have gray inversion etc., the image that brightness, form and aspect have good uniformity shows, simultaneously the rayed that concentrates on desired direction can be accessed, utilization ratio can be improved for the amount of emitted light of the primary source of the illumination of this direction.
Also have, in the present invention, utilize light deflection element 4 to make in the light supply apparatus of having tunnel vision, high briliancyization like this, can not cause briliancy decline ground as far as possible, suitably control field range according to purpose, can be on the exiting surface of light deflection element 4 with light diffusing member 6 neighbor configuration.Again, in the present invention, dispose light diffusing member 6 like this, can suppress to become the flicker of the low reason of quality and briliancy spot etc., seek to improve the quality.
In the present invention, consider the balance of briliancy characteristic, visual characteristic and quality etc., be necessary to use to have appropriateness and make light diffusing member 6 from the light diffusing light diffusion characteristic of ejaculation of light deflection element 4.That is to say, under the low situation of the light diffusion performance of light diffusing member 6, be difficult to make field-of-view angle fully to be expanded, visual performance is reduced, can not substantially improve quality simultaneously, otherwise, under the too high situation of light diffusion performance, the having tunnel vision effect that light deflection element 4 produces suffers damage, and simultaneously total light transmittance also reduces, the tendency that has briliancy to descend.So in light diffusing member 6 of the present invention, the element that the photodistributed halfwidth degree of the ejaculation when directional light is injected is 1～13 ° of scope.The halfwidth degree of light diffusing member 6 is advisable with 3～11 ° of scopes, and better is 4～8.5 ° of scopes.Also have, the photodistributed halfwidth degree of the ejaculation of so-called in the present invention light diffusing member 6, be as shown in figure 19, the parallel rays that light diffusing member 6 is injected in expression diffusion when penetrating is diffused into the numerical value of what kind of degree, is meant angle (the Δ θ with respect to whole width of the extended corner at half place of peak value in the photometric distribution of the ejaculation light that sees through light diffusing member 6 diffusions
11).
Such light diffusion characteristic can utilize in light diffusing member 6 and sneak into light diffusing agent, or forms the concaveconvex structure realization at least one surface of light diffusing member 6.Be formed at the concaveconvex structure on surface, different under the situation on a surface that is formed at light diffusing member 6 with its degree under the situation about all forming on the two sides.Forming under the situation of concaveconvex structure on the surface of light diffusing member 6, its average tilt angle is advisable in 0.8～12 ° scope, more satisfactory is 3.5～7 °, it is desirable to 4～6.5 ° more.Two surfaces at light diffusing member 6 all form under the situation of concaveconvex structure, and the concaveconvex structure average slope angle that forms on the one surface is advisable with 0.8～6 ° of scope, and more satisfactory is 2～4 °, it is desirable to 2.5～4 ° more.In this case, for the decline of total light transmittance of suppressing light diffusing member 6, preferably make the average slope angle of the face of injecting side of light diffusing member 6 bigger than the average slope angle of outgoing plane side.Again, from improving briliancy characteristic and the viewpoint of improving visual performance, the light diffusion transmitance ratio of light diffusing member 6 is advisable with 8～82% scope, and more satisfactory is 30～70%, and better is 40～65% scopes.
In light supply apparatus of the present invention, the briliancy in the viewing area under the situation that also requires to observe from the normal direction of its light-emitting area (outgoing plane of light diffusing member 6) is even.The homogeneity of this briliancy also depends on the size of the viewing area of light source, for example in big large-scale light supply apparatus such as the viewing area of notebook computer or monitor etc., sometimes require relatively broader field-of-view angle characteristic, requirement makes from the distribution of the ejaculation light of light-emitting area ejaculation wideer.On the other hand, under the situation of the little miniature light sources device in viewing areas such as portable phone and portable data assistance, the high briliancy of precedence requirement and improve display quality sometimes, distributing from the ejaculation light of light-emitting area also can be narrow.Therefore light diffusing member 6 preferably uses the element that has suitable light diffusion characteristic corresponding to the size of the viewing area of light supply apparatus.
In the present invention, can use light deflection element 4 to make and penetrate, this ejaculation light be penetrated to desirable direction with light diffusing member 6 with anisotropic diffusion performance to specific directions such as normal directions from the ejaculation light of light conductor 3.In this case, also can give anisotropic diffusion effect and two kinds of functions of light deflecting action to light diffusing member 6.For example under the situation of the object of concaveconvex structure use biconvex lens row or lens pillar shape, its section shape is formed asymmetrical shape, can give anisotropic diffusion effect and two kinds of functions of light deflecting action to it with this.
Again, in the present invention, the field-of-view angle as light supply apparatus is adjusted,, also can be made light deflection element 4 and light diffusing member 6 contain the light diffusion material for making its purpose that improves the quality.Such light diffusion material can use and constitute the transparent microparticle of the material different refractivity of light deflection element 4 and light diffusing member 6, for example can use silicon particle, polystyrene, polymethylmethacrylate, fluorate acrylic acid methyl esters (Off Star elementization メ Network リ レ-ト), etc. independent polymkeric substance or multipolymer etc.Be necessary content, particle diameter, refractive index etc. are carried out suitably selecting as the light diffusion material, to avoid damaging the narrow visual field effect of light deflection element 4 formation and the diffusion effect of the appropriateness that light diffusing member 6 causes.If for example the refractive index of light diffusion material is too small with the refringence of the material that constitutes light deflection element 4 and light diffusing member 6, then diffusion effect is little, if it is excessive then produce superfluous scattering refraction action, therefore the difference of refractive index is advisable with 0.01～0.1 scope, more satisfactory is 0.03～0.08, and better scope is 0.03～0.05.If the particle diameter of light diffusion material is excessive then dispersion effect is strong, can causes flicker and briliancy is descended again,, if it is too small then take place painted, therefore mean grain size is advisable to adopt 0.5～20 micrometer range, and more satisfactory is 2～15 microns, and better scope is 2～10 microns.
Also have, sometimes use the ejaculation light distribution of the light supply apparatus of the such light deflection element of the present invention to be the boundary with peak, ejaculation light in the primary source side distributes along with sharply descending away from its briliancy of peak light, penetrating light in the side away from primary source distributes, luminance ratio more slowly descends, and demonstrates asymmetrical ejaculation light and distributes.For example, the photodistributed light supply apparatus of such ejaculation is used in notebook computer more than the 254mm (10 inches) etc. need situation than the liquid crystal indicator of the field-of-view angle of broad under, the light diffusing member that optical diffuse is bigger is disposed to make on the exiting surface of light deflection element and penetrates light distributed expansion, the angle of broadening one's vision.Using this value of sea is under the situation of the strong light diffusing member of optical diffuse 50% or more, penetrates photodistributed peak value angle to away from about 1～3 ° of the lateral deviation commentaries on classics of primary source.Therefore be positioned under the situation of normal direction of its exiting surface from the photodistributed peak value angle of the ejaculation of light deflection element, utilize light diffusing member to make to penetrate photodistributed peak value angle from normal direction to away from the angle of light source one lateral deviation from 1～3 °, consequently, the briliancy under the situation of observing from normal direction is extremely descended.This be because, by using light diffusing member, though the photodistributed asymmetry of ejaculation that penetrates from light deflection element relaxes in a measure, the photodistributed position of the ejaculation that luminance ratio more seriously descends is positioned at the cause of normal direction.Extremely descend for fear of such briliancy, the photodistributed peak value angle of ejaculation of light deflection element is tilted 1～3 ° to light source side from normal direction.
Utilize embodiment that the present invention is specifically described below.Also have, the mensuration of each rerum natura in the following examples is as described below carries out.
The mensuration of the normal briliancy of planar light source device, luminosity halfwidth degree
Use cold-cathode tube as light source, inverter (HIU-742A that the inferior company of Harry makes) is applied the 12V DC voltage it is lighted with high-frequency current.The luminosity halfwidth degree of light conductor, the black paper that fixedly has the pin hole of 4mm-by surface at light conductor, make pin hole be positioned at the central authorities on surface, adjusting apart from making the mensuration circle of brightness photometer is 8～9mm, vertical direction and parallel direction in the longitudinal axis of cold-cathode tube are the center with the pin hole, and the rotation of direction finding (gonio) axle is to regulate.In all directions while making turning axle rotate on one side and measure the photometric distribution that penetrates light in the interval with 1 ° with brightness photometer from+80 ° to-80 °, the halfwidth degree of peaking angle, photometric distribution (extended corner of 1/2 distribution of peak value).Again, it is 0.1 ° that the briliancy halfwidth degree of planar light source device makes the field-of-view angle of brightness photometer, is adjusted into the face of the central authorities that are positioned at planar light source device, regulates to make the rotation of direction finding turning axle.In all directions turning axle is rotated at the interval with 1 ° from+80 ° to-80 °, with brightness photometer measure the briliancy distribution of penetrating light, peaking briliancy, peak value angle on one side.The peak value angle is 0 ° with the normal normal of light supply apparatus, and for negative, its opposition side is for just with primary source one side.
Use acrylic resin (the system ア of レ イ ョ Application Co., Ltd. of Mitsubishi Network リ Le ペ Star ト VH5#000), make the light conductor that face is frosted face (1.1 ° of an average slope angle) by ejection formation.The wedge shape of this light conductor formation 216mm * 290mm, thickness 2.0mm～0.7mm is tabular.On the mirrored sides of this light conductor, with the limit (minor face) of the length 216mm of light conductor abreast, utilizing propylene is that ultraviolet curable resin forms 100 ° of the prism vertex angles that the prism row are set side by side continuously, the layers of prisms of the prism row of spacing 50-m.Cover the cold-cathode tube configuration along a side end face (end face of thickness 2.0mm one side) corresponding with light source reflector (beautiful smooth society system silver reflectance coating) with the long limit of the length 290mm of light conductor.And, paste light diffusion reflectance coating (DongレShe makes E60) at the opposite side end face, go up the configuration reflector plate in prism row arrangement plane (back side).With the said structure framework of packing into.This light conductor is 70 ° with the peak-peak angle of ejaculation light photometric distribution in light is injected the face face vertical with light emergence face with respect to the light emergence face normal direction, and the half-breadth height is 22.5 °.
On the other hand, using refractive index is that 1.5064 propylene is a uv curing resin, making prism row, described prism row are that the cross section is a tie point 1 (16.031,59.828), point 2 (0.000,0.000), point 3 (12.000,15.695), point 4 (15.000,19.750), point 5 (18.000,23.925), point 6 (21.000,28.320), point 7 (24.000,32.818), point 8 (27.000,37.455), point 9 (30.000,42.238), point 10 (33.000,47.114), point 11 (36.000,52.087), point 12 (40.469,59.828) the prism row formation face that is provided with continuously side by side of the prism row of the spacing 56.5-m that constitutes of 11 planes forming of the shape of these 12 points (coordinate figure unit's micron: also identical in following examples), be formed on the surface of polyester film of 188 microns of thickness, make prismatic lens.
On this prismatic lens, top portion supporting role α is 15 °, and top portion supporting role β is 37.4 °.Corresponding to from put 2～angle of inclination on 10 planes of 12 is 52.6 °, 53.5 °, 54.3 °, 55.5 °, 56.3 °, 57.1 °, 57.9 °, 58.4 °, 58.9 °, 60.0 ° in regular turn.
The length L 1 of the face of formation prism row and L2 are L2/P=1.279, L2/L1=1.167 with respect to the prism column pitch P of prismatic lens.The imaginary plane that connects the top and bottom of prism row is 2.7% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～12 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.There is the optical defect that caused by the shaping of prism row etc. etc. hardly in the prismatic lens that obtains.
The prismatic lens that obtains configuration as described below is obtained planar light source device, described collocation method is, make the light emergence face side of prism row formation towards described light conductor, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets (corresponding with the line of tie point 1 and point 2: also identical in following examples) puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with peak value briliancy ratio, peak value angle under following comparative example 1 situation that is benchmark, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Except the cross section is a tie point 1 (11.638,66.002), point 2 (0.000,0.000), point 3 (9.000,11.519), point 4 (12.000,15.443), point 5 (15.000,19.396), point 6 (18.000,23.480), point 7 (21.000,27.686), point 8 (24.000,32.018), point 9 (27.000,36.483), point 10 (30.000,41.067), point 11 (33.000,45.776), point 12 (36.000,50.653), point 13 (44.862,66.002) 12 planes forming of the shape of these 13 points constitute outside the prisms row, with the embodiment 1 the same prismatic lens of having made.
In this prismatic lens, top portion supporting role α is 10 °, and top portion supporting role β is 38 °.Corresponding to from put 2～angle of inclination on 11 planes of 13 is 52.0 °, 52.6 °, 52.8 °, 53.7 °, 54.5 °, 55.3 °, 56.1 °, 56.8 °, 57.5 °, 58.4 °, 60.0 ° in regular turn.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.414, L2/L1=1.192.The imaginary plane that connects the top and bottom of prism row is 3.3% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～13 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The prismatic lens that obtains has some shapings by prism row etc. and the optical defect that causes.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Except the cross section is that 410.489 round tie point 4 is 629.574 round tie point 5 for radius centered to point 5 (36.000,50.653) with in order to a B (502.516,376.787) to two convex surfaces formation prisms of 6 (44.895,65.814) are listed as for radius centered by 3 planes of tie point 1 (11.605,65.814), point 2 (0.000,0.000), point 3 (9.000,11.519), point 4 (15.000,19.396) these 4 points and in order to an A (314.871,263.703), with the embodiment 2 the same prismatic lenses of having made.
In this prismatic lens, top portion supporting role α is 10 °, and top portion supporting role β is 38 °.Corresponding to from put 2～2 planes of 4 and corresponding to from put 4～2 convex surface angles of inclination of 6 are 52.0 °, 52.7 °, 56.1 °, 59.6 ° in regular turn.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.412, L2/L1=1.194.The imaginary plane that connects the top and bottom of prism row is 3.1% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～6 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The prismatic lens that obtains has some shapings by prism row etc. and the optical defect that causes.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Except the cross section is a tie point 1 (6.292,71.920), point 2 (0.000,0.000), point 3 (9.000,10.996), point 4 (12.000,14.687), point 5 (15.000,18,527), point 6 (18.000,22.494), point 7 (21.000,26.563), point 8 (24.000,30.753), point 9 (27.000,35.070), point 10 (30.000,39.517), point 11 (33.000,44.050), point 12 (36.000,48.669), point 13 (39.000,53.378), point 14 (42.000,58.179), point 15 (45.000,63.114), point 16 (50.208,71.920) 15 planes forming of the shape of these 16 points constitute outside the prisms row, with the embodiment 1 the same prismatic lens of having made.
In this prismatic lens, top portion supporting role α is 5 °, and top portion supporting role β is 39.3 °.Pitch angle corresponding to 14 planes of point 2～16 is 50.7 °, 50.9 °, 52.0 °, 52.9 °, 53.6 °, 54.4 °, 55.2 °, 56.0 °, 56.5 °, 57.0 °, 57.5 ° 58.0 °, 58.7 °, 59.4 ° in regular turn.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.555, L2/L1=1.217.The imaginary plane that connects the top and bottom of prism row is 3.7% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～16 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The prismatic lens that obtains has some shapings by prism row etc. and the optical defect that causes.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Embodiment 5
Except the cross section is that 376.827 round tie point 4 is 490.235 round tie point 5 for radius centered to point 5 (30.000,39.517) with in order to a B (376.959,312.857) to two convex surfaces formation prisms of 6 (50.178,72.265) are listed as for radius centered by 3 planes of tie point 1 (6.322,72.265), point 2 (0.000,0.000), point 3 (12.000,14.687), point 4 (15.000,18.527) these 4 points and in order to an A (283.909,247.987), with the embodiment 4 the same prismatic lenses of having made.
In this prismatic lens, top portion supporting role α is 5 °, and top portion supporting role β is 39.3 °.Corresponding to from put 2～2 planes of 4 and corresponding to from put 4～2 convex surface pitch angle of 6 are 50.7 °, 52.0 °, 54.4 °, 58.4 ° in regular turn.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.560, L2/L1=1.215.The imaginary plane that connects the top and bottom of prism row is 3.9% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～6 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The prismatic lens that obtains has some shapings by prism row etc. and the optical defect that causes.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Except the cross section is that 466.137 round tie point 2 is to 1 convex surface formation prism putting 3 (44.904,65.767) is listed as, with the embodiment 1 the same prismatic lens of making for radius centered by 1 plane of tie point 1 (11.596,65.767), point 2 (0.000,0.000) these 2 points and in order to an A (361.105,294.766).
In this prismatic lens, top portion supporting role α is 10 °, and top portion supporting role β is 34.3 °.1 convex surface angle of inclination corresponding to point 2～3 is 55.7 °.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.409, L2/L1=1.192.The imaginary plane that connects the top and bottom of prism row is 3.0% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～3 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The prismatic lens that obtains has some shapings by prism row etc. and the optical defect that causes.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Embodiment 7
Except the cross section is that 456.044 round tie point 2 is 660.857 round tie point 3 for radius centered to point 3 (30.000,42.238) with in order to a B (531.365,390.952) to two convex surfaces formation prisms of 4 (40.495,59.730) are listed as for radius centered by 1 plane of tie point 1 (16.005,59.730), point 2 (0.000,0.000) these 2 points and in order to an A (356.204,284.772), with the embodiment 1 the same prismatic lens of having made.
In this prismatic lens, top portion supporting role α is 15 °, and top portion supporting role β is 35.4 °.2 convex surface pitch angle corresponding to point 2～4 are 54.6 °, 59.0 ° in regular turn.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.277, L2/L1=1.167.The imaginary plane that connects the top and bottom of prism row is 2.5% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～4 and prism column pitch P.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The optical defect that the prismatic lens that obtains is not almost not caused by the shaping of prism row etc.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Except the cross section by 1 plane of tie point 1 (14.1776,61.4101), point 2 (0.000,0.000) these 2 points, and be that 504.3237 round tie point 2 is to 3 (42.3224, a 61.4101) formation prism is listed as, with the embodiment 1 the same prismatic lens of having made for radius centered in order to an A (392.9609,316.1078).In this prismatic lens, top portion supporting role α is 13 °, and top portion supporting role β is 34.6 °.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.320, L2/L1=1.183.The imaginary plane that connects the top and bottom of prism row is 2.4% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～4 and prism column pitch P, and its radius-of-curvature r and the ratio r/P of prism column pitch P are 8.93.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The optical defect that the prismatic lens that obtains is not almost not caused by the shaping of prism row etc.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Embodiment 9
Except adopting paddy portion from prism 3 microns position on the short transverse of prism, prism row are provided with the structure of par, with the embodiment 8 the same prismatic lenses of having made.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Except adopting paddy portion from prism 5 microns position on the short transverse of prism, prism row are provided with the structure of par, with the embodiment 8 the same prismatic lenses of having made.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Embodiment 11
Except adopting paddy portion from prism 7 microns position on the short transverse of prism, prism row are provided with the structure of par, with the embodiment 8 the same prismatic lenses of having made.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Embodiment 12
Except adopting paddy portion from prism 10 microns position on the short transverse of prism, prism row are provided with the structure of par, with the embodiment 8 the same prismatic lenses of having made.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Embodiment 13
Except the cross section is 468.9151 round tie point 2 for radius centered by 1 plane of tie point 1 (19.7523,54.2691), point 2 (0.000,0.000) these 2 points and in order to an A (368.9514,289.4.66) to putting 3 (36.74767, a 54.2691) formation prism is listed as, with the embodiment 1 the same prismatic lens of having made.In this prismatic lens, top portion supporting role α is 20 °, and top portion supporting role β is 33.8 °.
The length L 1 of the face of formation prism row and L2 are with respect to the prism column pitch P of prismatic lens, L2/P=1.160, L2/L1=1.135.The imaginary plane that connects the top and bottom of prism row is 2.3% with ratio d/P corresponding to the ultimate range d of the actual prism facets of point 2～4 and prism column pitch P, and its radius-of-curvature r and the ratio r/P of prism column pitch P are 8.30.The crest line of prism is 0.053 with respect to the concavo-convex degree of datum line, and prism facets is 0.036 with respect to the concavo-convex degree of reference field.The optical defect that the prismatic lens that obtains is not almost not caused by the shaping of prism row etc. etc.
With the prismatic lens that obtains configuration as described below, obtain planar light source device, described collocation method is that the prism row are formed towards the light emergence face side of the light conductor of embodiment 1, the crest line of prism is parallel to the light of light conductor and injects face, and the 1st prism facets puts in light source one side.Ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Again, liquid crystal display cells is disposed at this planar light source device observes, the result shows it is the high quality devices of problem such as do not glimmer.
Comparative example 1
Except the prism of prismatic lens row adopt two prism facets all is the plane, prism vertex angle is that 65.4 ° cross section is outside the member of isosceles triangle (α=β=32.7 °), with embodiment 1 the same making, obtained planar light source device, ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, getting the peak value briliancy is 1.00, measures the peak value angle, has the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, and it the results are shown in table 1.
Comparative example 2
Except the prism of prismatic lens row adopt two prism facets all is the plane, the top portion supporting role α of a face gets 5 °, the top portion supporting role β of another side gets outside 38 ° the structure, with embodiment 1 the same making, obtained planar light source device, ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and naked body outgoing plane, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
Comparative example 3
Except the prism of prismatic lens row adopt two prism facets all is the plane, the top portion supporting role α of a face gets 5 °, the top portion supporting role β of another side gets outside 35 ° the structure, with embodiment 1 the same making, obtained planar light source device, ask the light of this planar light source device to inject ejaculation radiance degree distribution in the vertical plane of face and light emergence face, mensuration with comparative example 1 be under the situation of benchmark peak value briliancy ratio, peak value angle, have the angle (halfwidth degree) of 1/2 briliancy of peak value briliancy, it the results are shown in table 1.
| Peak value briliancy ratio | The peak value angle (°) | The halfwidth degree (°) | |
| | 1.74 | -2 | 14 |
| | 1.80 | -3 | 13 |
| | 1.89 | -3 | 13 |
| | 1.92 | -2 | 13 |
| Embodiment 5 | 1.94 | -3 | 15 |
| | 1.82 | -3 | 13 |
| Embodiment 7 | 1.68 | -3 | 14 |
| | 1.76 | -1 | 14 |
| Embodiment 9 | 1.73 | -1 | 14 |
| | 1.71 | -1 | 14 |
| Embodiment 11 | 1.67 | -1 | 14 |
| Embodiment 12 | 1.63 | -1 | 14 |
| Embodiment 13 | 1.63 | -2 | 14 |
| Comparative example 1 | 1.00 | 0 | 22 |
| Comparative example 2 | 1.03 | -1 | 28 |
| Comparative example 3 | 1.19 | 1 | 24 |
Industrial applicability
As described above described, adopt the present invention, at least one of prism facets that consists of the prism row on the incidence surface be formed at light deflection element adopts non-single plane, and the top of a prism facets divides supporting role α to get 2～25 °, the top of another prism facets divides supporting role β to get 33～40 °, the top divides supporting role α and top to divide that supporting role β's is poor | alpha-beta | and get 8～35 °, can provide with this to make the light that sends from primary source to the light supply apparatus of the high efficiency (the light quantity utilization ratio of primary source) of the ejaculation of desired direction of observation optically focused.
Claims (30)
1. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 11～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane.
2. light deflection element according to claim 1 is characterized in that, a face of described two prism facets is made of non-single plane, and another face is made of single plane.
3. light deflection element according to claim 1 is characterized in that, described non-single plane is made of a convex surface at least.
4. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, wherein said top portion supporting role α, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Described non-single plane is made of the mutually different two or more convex surfaces in pitch angle, and wherein said pitch angle is meant the angle of inclination that forms each face on plane with respect to the prism row.
5. light deflection element according to claim 1 is characterized in that, described non-single plane is made of mutually different two or more planes, pitch angle, and wherein said pitch angle is meant the angle of inclination that forms each face on plane with respect to the prism row.
6. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, wherein said top portion supporting role α, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Described non-single plane is made of one or more plane and one or more convex surface.
7. according to claim 4 or 5 or 6 described light deflection elements, it is characterized in that, described non-single plane, described plane or its pitch angle of described convex surface of being positioned at close described exiting surface one side are big more, and wherein said pitch angle is meant the angle of inclination that forms each face on plane with respect to the prism row.
8. light deflection element according to claim 7, it is characterized in that, in the described non-single plane, the pitch angle of the face at the top of the most approaching described prism row and the difference at the pitch angle of the face of approaching described exiting surface be 1～15 °, wherein said pitch angle is meant the angle of inclination with respect to each face on prism row formation plane.
9. according to claim 4 or 5 or 6 described light deflection elements, it is characterized in that the photodistributed peak value direction of the ejaculation of light on described each face that penetrates from described exiting surface is the normal direction that forms the plane of described prism row after total reflection on each face of described plane that constitutes described non-single plane and/or described convex surface.
10. according to claim 3 or 4 or 6 described light deflection elements, it is characterized in that, constitute the convex surface of described non-single plane, its radius-of-curvature r and the ratio r/P of the spacing P of described prism row are 2～50.
11. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, wherein said top portion supporting role α, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Described prism row, coordinate with the summit on its cross section is an initial point, the length standard of the spacing P of described prism row turns at 1 o'clock, by tie point 1 (0.111,1.27), point 2 (0.0,0.0), point 3 (0.159,0.195), point 4 (0.212,0.260), point 5 (0.265,0.328), point 6 (0.319,0.398), point 7 (0.372,0.470), point 8 (0.425,0.544), point 9 (0.478,0.621), point 10 (0.531,0.699), point 11 (0.584,0.780), point 12 (0.637,0.861), point 13 (0.690,0.945), point 14 (0.743,1.030), point 15 (0.796,1.117), point 16 (0.889,1.27) this 16 points or be that radius centered is that the shape of the nearby point in 0.021 the circle constitutes with these points.
12. light deflection element according to claim 11, it is characterized in that, when the length standard of the spacing P of described prism row turns to 1, from described point 1～16 at least 5 points selecting, it is that radius centered is that the shape that the described nearby point in 0.021 the circle connects constitutes that described prism is listed as by being in these points.
13. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Described prism row, coordinate with the summit on its cross section is an initial point, the length standard of the spacing P of described prism row turns at 1 o'clock, by tie point 1 (0.206,1.168), point 2 (0.000,0.000), point 3 (0.159,0.204), point 4 (0.212,0.273), point 5 (0.265,0.343), point 6 (0.319,0.416), point 7 (0.372,0.490), point 8 (0.425,0.567), point 9 (0.478,0.646), point 10 (0.531,0.727), point 11 (0.584,0.810), point 12 (0.637,0.897), point 13 (0.794,1.168) this 13 points or be that radius centered is that the shape of the nearby point in 0.021 the circle constitutes with these points.
14. light deflection element according to claim 13, it is characterized in that, when the length standard of the spacing P of described prism row turns to 1, from described point 1～13 at least 5 points selecting, it is that radius centered is that the shape that the described nearby point in 0.021 the circle connects constitutes that described prism row will be in these points.
15. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Described prism row, coordinate with the summit on its cross section is an initial point, the length standard of the spacing P of described prism row turns at 1 o'clock, by tie point 1 (0.284,1.059), point 2 (0.000,0.000), point 3 (0.212,0.278), point 4 (0.265,0.350), point 5 (0.319,0.423), point 6 (0.372,0.501), point 7 (0.425,0.581), point 8 (0.478,0.663), point 9 (0.531,0.748), point 10 (0.584,0.834), point 11 (0.637,0.922), point 12 (0.716,1.059) this 12 points or be that radius centered is that the shape of the nearby point in 0.021 the circle constitutes with these points.
16. light deflection element according to claim 15, it is characterized in that, when the length standard of the spacing P of described prism row turns to 1, from described point 1～12 at least 5 points selecting, it is that radius centered is that the shape that the described nearby point in 0.021 the circle connects constitutes that described prism is listed as by being in these points.
17. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
The spacing P of described prism row, with in the section shape of the described prism facets of the top portion supporting role β that constitutes described prism row, be connected the length L 2 of the imaginary line of prism top and paddy portion, satisfy the relation of L2/P=1.1～1.7.
18. light deflection element according to claim 1, it is characterized in that, the length L 1 that connects the imaginary line of prism top and paddy portion in the section shape of the described prism facets of top portion supporting role α, length L 2 with being connected the imaginary line of prism top and paddy portion in the section shape of the described prism facets of top portion supporting role β satisfies the relation of L2/L1=1.1～1.3.
19. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Constitute the crest line that two prism facets of described prism row form, turn at 1 o'clock, form 0.018～0.354 concaveconvex shape with respect to the datum line of described crest line at the length standard of the spacing P of described prism row.
20. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Constitute two prism facets of described prism row, turn at 1 o'clock, form 0.012～0.334 concaveconvex shape with respect to the reference field of described prism facets at the length standard of the spacing P of described prism row.
21. light deflection element, it is characterized in that, have the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange the prism row that multiple row is made of two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, described top portion supporting role α and described top portion supporting role β's is poor | alpha-beta | and be 8～35 °, top portion supporting role α wherein, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane
Between the adjacent prism row par is set.
22. light deflection element according to claim 21 is characterized in that, described par is arranged on the short transverse of prism row the position from 2～10 microns of prism valley.
23. light deflection element according to claim 21 is characterized in that, described par turns at 1 o'clock at the length standard of the spacing P of described prism row, is arranged on the short transverse of prism row the position from prism valley 0.035～0.18.
24. light deflection element according to claim 21, it is characterized in that, the length L 2 that connects prism top and the imaginary line of prism valley in the section shape of the described prism facets of top portion supporting role β is standardized as at 1 o'clock, and described par is arranged on the short transverse that prism is listed as the position from prism valley 0.022～0.16.
25. light deflection element, it is characterized in that, have and make the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange a plurality of prism row that constitute by two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, two crest lines that prism facets forms, length standard at the spacing P of described prism row turns at 1 o'clock, datum line with respect to described crest line forms 0.018～0.354 concaveconvex shape, wherein top portion supporting role α, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane.
26. light deflection element, it is characterized in that, have and make the incidence surface that light injects and be positioned at its opposition side, make the exiting surface of the light ejaculation of injecting, arrange a plurality of prism row that constitute by two prism facets on the described incidence surface mutually side by side, at least one face of these two prism facets is made of non-single plane, and the top portion supporting role α that constitutes a prism facets of described prism row is 2～25 °, the top portion supporting role β of another prism facets is 33～40 °, two prism facets turn at 1 o'clock at the length standard of the spacing P of described prism row, reference field with respect to described prism facets forms 0.012～0.334 concaveconvex shape, wherein top portion supporting role α, β is meant the top of prism facets and the formed angle of normal direction that the prism row form the plane.
27. a light supply apparatus is characterized in that possessing: primary source; The light that has the light that sends from this primary source to inject is injected face and the light that guiding injects is arranged and the light conductor of the light emergence face that the light that makes guiding penetrated; And each the described light deflection element in the claim 1～6,8,11～26, described light deflection element is configured to make its incidence surface relative with the described light emergence face of this light conductor.
28. light supply apparatus according to claim 27, it is characterized in that, described light deflection element, the described prism facets of the top portion supporting role α of its prism row is disposed at the side near described primary source, the described prism facets of the top portion supporting role β of its prism row is disposed at the side away from described primary source, and wherein top portion supporting role α, β are meant the top of prism facets and the formed angle of normal direction that the prism row form the plane.
29. light supply apparatus according to claim 27 is characterized in that, the corner portions located of described primary source and described light conductor disposes in abutting connection with ground, and the prism of described light deflection element to be listed as with described primary source be that center configuration becomes concentric circles.
30. light supply apparatus according to claim 27 is characterized in that, has the light diffusion element with the exiting surface disposed adjacent of described light deflection element, on the photodistributed halfwidth degree of the ejaculation when directional light is injected, this light diffusion element has anisotropy.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002355275 | 2002-12-06 | ||
| JP355275/2002 | 2002-12-06 | ||
| JP28387/2003 | 2003-02-05 |
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| CN1720467A CN1720467A (en) | 2006-01-11 |
| CN100347567C true CN100347567C (en) | 2007-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003801050915A Expired - Lifetime CN100347567C (en) | 2002-12-06 | 2003-11-28 | Light deflector and light source device |
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| CN105247411A (en) * | 2013-06-04 | 2016-01-13 | 夏普株式会社 | Display device |
| WO2018220978A1 (en) * | 2017-05-31 | 2018-12-06 | ソニー株式会社 | Optical member, light-emitting device, display device, and illumination device |
| CN108563065B (en) * | 2018-03-12 | 2022-01-07 | 厦门天马微电子有限公司 | Backlight module, manufacturing method and display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07230002A (en) * | 1994-02-17 | 1995-08-29 | Mitsubishi Rayon Co Ltd | Luminance improved transparent sheet |
| JPH08304607A (en) * | 1995-05-09 | 1996-11-22 | Toshiba Corp | Backlight |
| JPH10254371A (en) * | 1997-03-11 | 1998-09-25 | Enplas Corp | Surface light source device and asymmetrical prism sheet |
| JP2001143515A (en) * | 1999-09-03 | 2001-05-25 | Mitsubishi Rayon Co Ltd | Prism sheet and panel light source element |
| CN1356582A (en) * | 2000-12-01 | 2002-07-03 | 三菱电机株式会社 | Reflection-type LCD |
| JP2002197908A (en) * | 2000-12-25 | 2002-07-12 | Enplas Corp | Light control sheet, surface light source device, and liquid crystal display |
-
2003
- 2003-11-28 CN CNB2003801050915A patent/CN100347567C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07230002A (en) * | 1994-02-17 | 1995-08-29 | Mitsubishi Rayon Co Ltd | Luminance improved transparent sheet |
| JPH08304607A (en) * | 1995-05-09 | 1996-11-22 | Toshiba Corp | Backlight |
| JPH10254371A (en) * | 1997-03-11 | 1998-09-25 | Enplas Corp | Surface light source device and asymmetrical prism sheet |
| JP2001143515A (en) * | 1999-09-03 | 2001-05-25 | Mitsubishi Rayon Co Ltd | Prism sheet and panel light source element |
| CN1356582A (en) * | 2000-12-01 | 2002-07-03 | 三菱电机株式会社 | Reflection-type LCD |
| JP2002197908A (en) * | 2000-12-25 | 2002-07-12 | Enplas Corp | Light control sheet, surface light source device, and liquid crystal display |
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