CN101178447B - Light emitting module and light receiving module - Google Patents

Light emitting module and light receiving module Download PDF

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Publication number
CN101178447B
CN101178447B CN2007101666700A CN200710166670A CN101178447B CN 101178447 B CN101178447 B CN 101178447B CN 2007101666700 A CN2007101666700 A CN 2007101666700A CN 200710166670 A CN200710166670 A CN 200710166670A CN 101178447 B CN101178447 B CN 101178447B
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light
refraction
emission
lens element
planes
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CN101178447A (en
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家田知明
笹井裕之
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

A plurality of first refraction surfaces (121) and a plurality of second refraction surfaces (122) are alternately provided on an emission surface of a lens element (120) so as to form concentric circles each having an optical axis (113) at the center thereof, and having diameters different from each other, and a light reflected by a plurality of reflection surfaces (123) provided on an incident surface of the lens element so as to form concentric circuits each having the optical axis (113) at the center thereof and having diameters different from each other, is refracted and emitted by the plurality of second refraction surfaces (122) at desired angles. Therefore, it is possible to enhance efficiency and an emission intensity, and reduce variations in brightness of an emitted light without increasing the diameter of the lens element (120), thereby realizing a light emitting module (100) enabling advantageous performance.

Description

Light emission module and Optical Receivers
Technical field
The present invention relates to be respectively applied for the wireless optical transmitter in (for example) wireless optical transmission system and the light emission module and the Optical Receivers of wireless optical receiver, described wireless optical transmission system is used for the information data as light signal by free space transmission such as video data, sound signal and digital data signal, more specifically, the brightness that the present invention relates to reduce the light of the being launched Optical Receivers that changes (variation) and the light emission module of raising the efficiency and have the light collection efficiency of raising.
Background technology
The favorable characteristics that is used for the wireless optical transmission system by the free space transmitting optical signal is, because light can be realized wideband transmit, thereby can carry out transmission with the speed higher than the wireless radio transmission that adopts radiowave.Want in mobile device, to include in the wireless optical transmitter and the wireless optical receiver of wireless optical transmission system, must reduce thickness and the size of every person in its interior light emission module that adopts and the Optical Receivers.
For some conventional light emission modules, adopt the Fresnel lens to change the emission angle of the light of light emitted, realize the reduction (for example, opening 2005-49367) of its thickness thus referring to the open text spy of Jap.P..Figure 27 shows the synoptic diagram that the open text spy of Jap.P. opens disclosed conventional light emission module among the 2005-49367.
As shown in figure 27, light emission module 10 comprises light source 1 and lens 2.Lens 2 have a plurality of planes of refraction 3 on its emitting surface, described a plurality of plane of refraction 3 is set to form concentric circles, each described concentric circles has the optical axis that is positioned at its center, and has mutually different diameter, thereby make lens 2 play a part the Fresnel lens, therefore, lens 2 make the anaclasis of light source 1 emission, thereby emission is basically parallel to the light of optical axis 4.Allow the Fresnel lens to have than spherical lens that has continuous curve surface and the thinner lens component of non-spherical lens, that is, the thickness of the described lens component of permission Fresnel lens is reduced to the thickness of plate.In other words, the Fresnel lens are characterised in that, can easily reduce the thickness of Fresnel lens.But because there is restriction in (for example) in handling with the process that forms its pitch angle to described a plurality of planes of refraction 3, thereby the Fresnel lens are constructed to, and make acceptance angle 2 β of the light that receives light source 1 emission only have limited value.Therefore, when light source 1 radiative angle was big, light emission module 10 possibly can't be launched light effectively.
In addition, the open text spy of Jap.P. opens the scope that 2005-49367 discloses the acceptance angle that improves the light that receives light source 1 emission.Figure 28 shows the synoptic diagram that the open text spy of Jap.P. opens disclosed another conventional light emission module 11 among the 2005-49367.
As shown in figure 28, light emission module 11 comprises light source 1 and lens 12.Lens 12 have a plurality of planes of refraction 13 on its emitting surface, described a plurality of plane of refraction 13 is similar to a plurality of planes of refraction 3 of lens shown in Figure 27 2, and lens 12 have a plurality of reflectings surface 15 on its incidence surface, described a plurality of reflecting surface 15 is set to form concentric circles, each described concentric circles has the optical axis that is positioned at its center, and has mutually different diameter.By a part of light of described a plurality of reflecting surface 15 reflection sources 1, thereby make its planar section 16 emissions from the emitting surface of lens 2 to launch greater than the emission angle of 2 β.
On the other hand, some conventional Optical Receivers that are used for incident light is converted into electric signal combine the Fresnel lens as the collecting lens that compiles the incident light on the light receiving element, reduce its thickness (for example, opening 3-60080) thus referring to the open text spy of Jap.P..Figure 30 shows the synoptic diagram that the open text spy of Jap.P. opens the disclosed conventional Optical Receivers 20 of 3-60080.
As shown in figure 30, Optical Receivers 20 comprises collecting lens 21 and light receiving element 22.Collecting lens 21 plays a part the Fresnel lens, described Fresnel lens have a plurality of planes of refraction 23 on its incidence surface, described a plurality of planes of refraction 23 are set to form concentric circles, and each described concentric circles has the optical axis that is positioned at its center, and has mutually different diameter.The incident light that collecting lens 21 is collected on the light receiving element 22.Compare with convex lens with sphere etc., the collecting lens 21 that allows to play a part the Fresnel lens has the thickness of reduction.
Figure 29 is the A1 enlarged drawing partly with light emission module 11 of conventional configurations shown in Figure 28.As shown in figure 29, the every person in described a plurality of planes of refraction 13 has the invalid part of lens (lens invalid portion) at its tip, and it has stoped the light of light source 1 emission to pass therethrough.Therefore, produced the dark part that prevents that light from passing therethrough.Therefore, light emission module 11 exists the light of launching from lens 12 to have the problem that brightness changes.
In addition, the light that conventional light emission module 11 shown in Figure 28 is reflected by described a plurality of reflectings surface 15 from planar section 16 emissions of emitting surface, described planar section 16 is corresponding to the outmost contour part outwardly of described a plurality of planes of refraction 13.Therefore, the diameter d 2 of described a plurality of reflectings surface 15 must improve the diameter of lens 12 thus greater than the diameter d 1 of described a plurality of planes of refraction 13.
In addition, Figure 31 is the enlarged drawing of the A2 part of conventional Optical Receivers 20 shown in Figure 30.As shown in figure 31, the every person in described a plurality of plane of refraction 23 has the invalid part of lens that obstruction is collected incident light thereon at its tip.Therefore, the problem that Optical Receivers 20 exists light collection efficiency to reduce, this is owing to the zone that can't collect incident light causes.
Summary of the invention
Therefore, first purpose of the present invention is to provide a kind of can reducing at the diameter that makes lens to reduce the light emission module that radiative brightness changes and raises the efficiency in minimum.In addition, second purpose of the present invention is to provide a kind of and can reduces to the Optical Receivers that improves light collection efficiency in minimum at the diameter that makes lens.
In order to realize first purpose, the present invention relates to a kind of light emission module, it comprises light source and is used for the spread angle that the light of described light emitted launches is reduced to predetermined angular, and with the radiative lens element of this predetermined angular, wherein said lens element comprises: a plurality of first planes of refraction, it is arranged on the emitting surface of described lens element, and forming with the optical axis is the different concentric circles of diameter at center, and described a plurality of first planes of refraction are used for reflecting from light source to be in 0 to θ 0Scope in the first emission light of emission angle emission, thereby launch the described first emission light with described predetermined angular, wherein, described emission angle is meant described optical axis and launches angle between the described first radiative direction; It is the different concentric circles of diameter at center that a plurality of reflectings surface, its plane of incidence at described lens element form with described optical axis, will be from light source with greater than θ 0The second emission light of emission angle emission guide to the emitting surface of described lens element, wherein, described emission angle is meant described optical axis and the angle of launching between the described second radiative direction; And a plurality of second planes of refraction, it is arranged on the emitting surface of described lens element, formation is the different concentric circles of diameter at center with described optical axis, described a plurality of second plane of refraction is used to reflect the second emission light by described a plurality of reflecting surface guiding, thereby launch the described second emission light with described predetermined angular, and described a plurality of second plane of refraction and described a plurality of first plane of refraction alternately are provided on the described emitting surface of described lens element, and described a plurality of reflectings surface are corresponding one to one with described a plurality of second planes of refraction.
Described a plurality of reflecting surface preferably includes at least one fully reflecting surface.
Described light emission module also preferably includes reverberator, and it is used for the described second emission light of described light emitted is guided to described a plurality of reflecting surface.
Described second of the described light emitted of the preferred reflection of described reverberator reflection is launched in the light to be in θ 2To θ 3Scope in the emission light of emission angle emission, thereby prevent that described emission light from directly arriving at described lens element, wherein, described emission angle is meant described optical axis and the angle of launching between the described radiative direction.
Distance between the outermost contour of described optical axis and described a plurality of reflectings surface is preferably smaller or equal to the distance between the outermost contour (outermostcircumference) of described optical axis and described a plurality of first planes of refraction.
The shape that described a plurality of second plane of refraction has is preferably eliminated the invalid part of the radiative emission that hinders described light emitted from the described emitting surface of described lens element.
In order to realize second purpose, the present invention relates to a kind of Optical Receivers, it comprises light receiving element and is used for light is collected lens element on the described light receiving element, wherein said lens element comprises: a plurality of first planes of refraction, it is arranged on the incidence surface of described lens element, formation is the different concentric circles of diameter at center with the optical axis, and described a plurality of first planes of refraction are used to reflect the part of described incident light, thereby described incident light is collected described light receiving element; A plurality of second planes of refraction, it is arranged on the described incidence surface of described lens element, formation is the different concentric circles of diameter at center with described optical axis, described a plurality of second plane of refraction is used to reflect other parts of described incident light, and described a plurality of second planes of refraction and a plurality of first plane of refraction are arranged alternately on the incidence surface of described lens element; And a plurality of reflectings surface, it is arranged on such position is the different concentric circles of diameter at center to form with described optical axis, to prevent to be subjected to described a plurality of first plane of refraction refraction, so that the light that is collected on the described light receiving element passes therebetween, described a plurality of reflectings surface are used for the light that is subjected to described a plurality of second plane of refraction refractions is collected described light receiving element; Described a plurality of reflecting surface is corresponding one to one with described a plurality of second planes of refraction.
Described a plurality of reflecting surface preferably includes at least one fully reflecting surface.
Described Optical Receivers also preferably includes reverberator, and it is used for and will collects described light receiving element by the light of described a plurality of reflecting surface guiding.
Distance between the outermost contour of described optical axis and described a plurality of reflectings surface is preferably smaller or equal to the distance between the outermost contour of described optical axis and described a plurality of first planes of refraction.
The shape that described a plurality of second plane of refraction has is preferably eliminated from the described incidence surface of described lens element and is hindered described incident light and be collected into invalid part on the described light receiving element.
As mentioned above, allow to reduce to according to light emission module according to the present invention and reduce radiative brightness in minimum and change, and raise the efficiency at the diameter that makes lens.In addition, allow to reduce to according to Optical Receivers according to the present invention and improve light collection efficiency in minimum at the diameter that makes lens.
By the detailed description of hereinafter in conjunction with the accompanying drawings the present invention being made, these and other purposes of the present invention, feature, aspect and advantage will become more obvious.
Description of drawings
Fig. 1 is according to the top view of the light emission module of first embodiment of the invention and side cross-sectional, view;
Fig. 2 is the side cross-sectional, view according to the major part of the light emission module of first embodiment of the invention;
Fig. 3 is the side cross-sectional, view according to the major part of the light emission module of first embodiment of the invention;
Fig. 4 is the side cross-sectional, view according to the exemplary modifications of the light emission module of the first embodiment of the present invention;
Fig. 5 is the side cross-sectional, view according to the exemplary modifications of the lens element of the first embodiment of the present invention;
Fig. 6 is the side cross-sectional, view according to the exemplary modifications of the lens element of the first embodiment of the present invention;
Fig. 7 is the side cross-sectional, view according to the major part of the exemplary modifications of the light emission module of the first embodiment of the present invention;
Fig. 8 is the side cross-sectional, view according to the major part of the exemplary modifications of the light emission module of the first embodiment of the present invention;
Fig. 9 is the side cross-sectional, view according to the major part of the exemplary modifications of the light emission module of the first embodiment of the present invention;
Figure 10 is the top view according to the light emission module of second embodiment of the invention;
Figure 11 is the side cross-sectional, view of light emission module according to a second embodiment of the present invention;
Figure 12 is the side cross-sectional, view according to the major part of the light emission module of second embodiment of the invention;
Figure 13 is the amplification side cross-sectional, view according to the major part of the light emission module of second embodiment of the invention;
Figure 14 is the side cross-sectional, view of the exemplary modifications of light emission module according to a second embodiment of the present invention;
Figure 15 is the side cross-sectional, view of major part of the exemplary modifications of light emission module according to a second embodiment of the present invention;
Figure 16 is the side cross-sectional, view of major part of the exemplary modifications of light emission module according to a second embodiment of the present invention;
Figure 17 is the side cross-sectional, view of major part of the exemplary modifications of light emission module according to a second embodiment of the present invention;
Figure 18 is the side cross-sectional, view of major part of the exemplary modifications of light emission module according to a second embodiment of the present invention;
Figure 19 is according to the top view of the Optical Receivers of third embodiment of the invention and side cross-sectional, view;
Figure 20 is the side cross-sectional, view according to the major part of the Optical Receivers of third embodiment of the invention;
Figure 21 is the top view of the Optical Receivers of a fourth embodiment in accordance with the invention;
Figure 22 is the side cross-sectional, view of the Optical Receivers of a fourth embodiment in accordance with the invention;
Figure 23 is the side cross-sectional, view according to the major part of the Optical Receivers of fourth embodiment of the invention;
Figure 24 is the side cross-sectional, view of major part of exemplary modifications of the Optical Receivers of a fourth embodiment in accordance with the invention;
Figure 25 is the side cross-sectional, view of major part of exemplary modifications of the Optical Receivers of a fourth embodiment in accordance with the invention;
Figure 26 is the side cross-sectional, view of major part of exemplary modifications of the Optical Receivers of a fourth embodiment in accordance with the invention;
Figure 27 is the side cross-sectional, view of conventional light emission module;
Figure 28 is the side cross-sectional, view of conventional light emission module;
Figure 29 is the amplification side cross-sectional, view of the A1 part of conventional light emission module shown in Figure 28;
Figure 30 is the side cross-sectional, view of conventional Optical Receivers; And
Figure 31 is the amplification side cross-sectional, view of the A2 part of conventional Optical Receivers shown in Figure 30.
Embodiment
Hereinafter, embodiments of the invention will be described with reference to the drawings.
(first embodiment)
Fig. 1 is top view and the side cross-sectional, view according to the light emission module 100 of first embodiment of the invention.Fig. 2 is the side cross-sectional, view according to the major part of the light emission module 100 of first embodiment of the invention.
As depicted in figs. 1 and 2, light emission module 100 mainly comprises light source 110 and lens element 120.As light source 110, for example, adopt LED or semiconductor laser.Light source 110 is received in the encapsulation 111.In shell 130, encapsulation 111 and lens element 120 are fixed on the position that can satisfy predetermined location relationship therebetween.Modulated electric signal is offered light source 110 by terminal 112, the light signal that light source 110 emission (for example) luminous intensities change according to described modulation signal, thus described light signal is launched from optical axis 113.For example, when adopting LED as light source 110, show as Lambertian substantially from the distribution of the light of light source 110 emissions and distribute, wherein, emissive porwer is directly proportional with cos θ, and θ represents the emission angle as the angle between optical axis 113 and the transmit direction.
The angle that adopts lens element 120 to scatter from the light of light source 110 becomes suitable spread angle.Receive the light signal of being launched by the wireless optical receiver (not shown) that is set in the face of light emission module 100, realize wireless optical transmission thus information data.When the wide distribution of the light of light emission module 100 emission had caused the reduction of radiosity, described wireless optical transmission system only can only provide the transmission range of shortening.Therefore, lens element 120 is designed to, the spread angle that the light that light source 110 is launched launches is reduced to predetermined angular, and with this predetermined angular emission light.As shown in Figure 2, lens element 120 has a plurality of first planes of refraction 121 on its emitting surface, and described a plurality of first planes of refraction 121 are set to form concentric circles, and each described concentric circles has the optical axis 113 that is positioned at its center, and has mutually different diameter.Every person's refract light source 110 in described a plurality of first plane of refraction 121 is with smaller or equal to θ 0The light of angular emission, and launch described light along the direction of representing by the expection angle.The light that Fig. 2 shows light source 110 emissions becomes the situation of the light that is parallel to optical axis 113 as simple example.That is to say that described a plurality of first planes of refraction 121 play a part typical Fresnel lens.Therefore, described a plurality of first plane of refraction 121 is worked according to the mode identical with the conventional light emission module shown in Figure 27 and Figure 28.
Next, with the conventional light emission module of description and according to the difference between the light emission module 100 of the first embodiment of the present invention.Except the lens of conventional light emission module, have a plurality of second planes of refraction 122 that are formed on its emitting surface according to the lens element 120 of the light emission module 100 of the first embodiment of the present invention.In addition, described a plurality of reflectings surface 123 are formed light guiding section, it is used for light source 110 with greater than θ 0The light of emission angle emission towards 122 guiding of described a plurality of second planes of refraction, described θ 0Angle between expression optical axis 113 and the transmit direction.
Described a plurality of second plane of refraction 122 and a plurality of first plane of refraction 121 alternately are provided on the emitting surface of described lens element 120, thereby make it to form the concentric circles that every person has the optical axis 113 that is positioned at its center.The shape that the lens surface of described a plurality of second planes of refraction 122 has can prevent that lens element 120 from comprising the invalid part of lens (corresponding to the oblique line part among Fig. 2) of the lens 12 of Figure 28 and conventional light emission module shown in Figure 29.That is to say that lens element 120 does not comprise the photoemissive invalid part of obstruction from light source 110.
A plurality of reflectings surface 123 are provided on the incidence surface of described lens element 120, have optical axis 113 that is positioned at its center and concentric circles with mutually different diameter to form every person.In addition, described a plurality of reflecting surface 123 is a plurality of fully reflecting surfaces.In addition, described a plurality of reflectings surface 123 are provided as absorption with greater than θ 0Emission angle from the light of light source 110 emission.Make with smaller or equal to θ by described a plurality of first planes of refraction 121 0Emission angle reflect from the light of light source 110 emission, and it is launched from lens element 120.Therefore, at the light of light source 110 emission with smaller or equal to θ 0Emission angle during from lens element 120 emission, do not produce optical loss.Described a plurality of reflecting surface 123 interacts with man-to-man corresponded manner basically with described a plurality of second planes of refraction 122, therefore, according to man-to-man corresponding relation with light source 110 to be in θ 0To θ 1Scope in the light of emission angle emission towards 122 reflections of described a plurality of second planes of refraction.Described a plurality of second plane of refraction 122 reflects reflected light, and will be from the described light through refraction of lens element 120 emissions.In this case, the angle of described a plurality of reflectings surface 123 is set to, make light from lens element 120 with expection angular emission (among Fig. 2, making parallel light) in optical axis 113 emission.
As mentioned above, described a plurality of second planes of refraction 122 and described a plurality of reflecting surface 123 are formed, make light source 110 to be in θ 0To θ 1Scope in the light of emission angle emission from part emission corresponding to dark part shown in Figure 29, reduce radiative brightness thus and change.In addition, with smaller or equal to θ 0Emission angle from the light of light source 110 emission with to be in θ 0To θ 1Scope in emission angle from the light of light source 110 emission all the diameter from described a plurality of first planes of refraction 121 be emission in the zone of do, having improved diameter thus is the interior radiosity in zone of do, and has realized realizing the light emitting module 100 of efficient performance.In addition, under the situation of the diameter that does not increase lens element 120, compare with typical conventional Fresnel lens, when the distance between the outermost contour of optical axis 113 and described a plurality of reflecting surface 123 smaller or equal between the outermost contour of optical axis 113 and described a plurality of first planes of refraction 121 apart from the time (that is to say, diameter d i is smaller or equal to diameter d o), might improve the efficient and the intensity of the light of light emission module emission.More particularly, conventional light emission module 11 shown in Figure 28 must improve the diameter of lens 12, because the light by described a plurality of reflecting surface 15 reflections is launched from the emitting surface (that is to say, from the zone of diameter d 1 outside) corresponding to the part outside the outermost contour of described a plurality of planes of refraction 13.On the other hand, according to first embodiment, light by described a plurality of reflecting surface 123 reflections is launched from described a plurality of second planes of refraction 122 respectively, and the distance between the outermost contour of optical axis 113 and a plurality of second planes of refraction 122 is configured to less than the distance between the outermost contour (edge of diameter d o) of optical axis 113 and a plurality of first planes of refraction 121.Therefore, might under the situation of the diameter that does not improve lens element 120, raise the efficiency.
As mentioned above, according to first embodiment, described a plurality of first plane of refraction 121 and a plurality of second plane of refraction 122 alternately are provided on the emitting surface of lens element 120, has the optical axis 113 that is positioned at its center to form every person, and concentric circles with mutually different diameter, a plurality of reflectings surface 123 are provided on the incidence surface of lens element 120, has the optical axis 113 that is positioned at its center to form every person, and the concentric circles with mutually different diameter, the light that reflects through described a plurality of reflectings surface 123 with the angle refraction and the emission of expection by described a plurality of second planes of refraction 122 respectively.Therefore, might be under the situation of the diameter that does not improve lens element 120, the brightness that reduces the light of being launched changes, and raises the efficiency and emissive porwer, realizes having the light emission module 100 of advantageous property thus.
Although, in the above description, described a plurality of reflecting surface 123 interacts with man-to-man substantially corresponded manner with described a plurality of second planes of refraction 122, still, described a plurality of reflectings surface 123 can with at least one interaction in described a plurality of second planes of refraction 122.Still with regard to this situation, compare with conventional light emission module, might be under the situation of the diameter that does not improve lens element 120, the brightness of the light that reduction lens element 120 is launched changes, and raise the efficiency and emissive porwer, realize having the light emission module 100 of advantageous property thus.
Next, will the angle of the lens surface of described a plurality of second planes of refraction 122 and described a plurality of reflecting surface 123 be described in more detail.Fig. 3 is the side cross-sectional, view of the major part of light emission module 100 according to first embodiment shown in Figure 2.To describe in detail hereinafter and reflect from light source 110 with α 1The reflection of light face 123a of emission angle emission and the second plane of refraction 122a that points to through the light of reflection.
As shown in Figure 3, the second plane of refraction 122a is provided as along ray 114, ray 114 is by making the anaclasis of light source 110 emissions on the incidence surface 124 of lens element, and makes light through refraction pass that lens element 120 obtains.The shape that the second plane of refraction 122a has makes it not comprise the invalid part of said lens.Reflection spot P place reflection on reflecting surface 123a is with emission angle α 1From the light of light source 110 emissions, α 1Angle between expression optical axis 113 and the transmit direction.Make reflected light point to the second plane of refraction 122a, and the refraction point Q place on the second plane of refraction 122a reflected, so along the direction that is parallel to optical axis 113 as the emission of emission light.
n 1Optical index between expression light source 110 and the lens element 120, n 2The optical index of expression lens element 120, n 3Optical index between expression lens element 120 and the wireless optical receiver (not shown).In the time of in the middle of lens element is positioned at air, refractive index n 1And n 3In every person be almost 1.β 1Be illustrated in some O place, the angle between ray 114 and the optical axis 113 corresponding to the position of light source 110.β 2Be illustrated in the some R place of lens element 120, the angle between ray 114 and the line that is orthogonal to incidence surface 124 (in the present embodiment for being parallel to the line of optical axis 113, because incidence surface 124 is the plane).R represents to extend from the summit of the projection of the emitting surface of the lens element 120 that comprises the second plane of refraction 122a length of the line vertical with optical axis 113, L 1The length that expression is extended perpendicular to the line of incidence surface 124 from light source 110, L 2The length perpendicular to the line of incidence surface 124 is extended in expression from the summit of the projection of the emitting surface of the lens element 120 that comprises the second plane of refraction 122a.In this case, satisfy equation (1) and (2).
r＝L 1tanβ 1+L 2tanβ 2……(1)
n 1·sinβ 1＝n 2·sinβ 2……(2)
Thereby, based on length r, L 1And L 2Determine the angle β of the second plane of refraction 122a 2
In addition, α 2Be illustrated in line that reflection spot P place is parallel to optical axis 113 with by reflecting by light source 110 with emission angle α at reflection spot P place 1The light of emission and angle between the reflected light that obtains.α 2' be illustrated in refraction point Q place, the light that is reflected at reflection spot P place and perpendicular to the angle between the line of the second plane of refraction 122a.γ is illustrated in reflection spot P place, is parallel to the line of incidence surface 124 and perpendicular to the angle between the line of reflecting surface 123a.In this case, satisfy equation (3) to (5).
n 3·sin(π/2-β 2)＝n 2·sinα 2′……(3)
α 2＝π/2-β 2-α 2′……(4)
γ＝(α 1-α 2)/2……(5)
Thereby, based on the emission angle α of the light of light source 110 emission 1Determine the angle γ of reflecting surface 123a.
In addition, when satisfying following equation (6), described a plurality of reflectings surface 123 can be formed a plurality of fully reflecting surfaces.When not satisfying equation (6), for example, can be to described a plurality of reflecting surface 123 plated metals, to obtain to realize a plurality of reflectings surface 123 of estimated performance.
n 2·sin{(π-α 1-α 2)/2}≥n 1…………(6)
First embodiment according to shown in Figure 1 is configured to light emission module 100, with light source 110 be received into the encapsulation 111 in, will encapsulate 111 and lens element 120 be fixed to shell 130.But, should be appreciated that and can adopt any other structures that satisfy aforementioned relation to produce effect same as described above.For example, as shown in Figure 4, can adopt encapsulation 140 to substitute the encapsulation 111 of light emission module 100 shown in Figure 1, can in encapsulation 140, fixedly install light source 110.
In addition, according to first embodiment, lens element 120 is configured to, distance between the outermost contour of optical axis 113 and a plurality of reflecting surface 123 (be that is to say smaller or equal to the distance between the outermost contour of optical axis 113 and a plurality of first planes of refraction 121, diameter d i is smaller or equal to diameter d o), avoid improving the diameter of lens element 120 thus.The invention is not restricted to this.As shown in Figure 5, can adopt distance between the outermost contour of optical axis 113 and a plurality of reflecting surface 223 greater than the distance between the outermost contour of optical axis 113 and a plurality of first planes of refraction 121 (that is to say that diameter d i2 is greater than diameter d o).The structure of lens element 220 allows to raise the efficiency and emissive porwer, and can reduce to the brightness variation that reduces the light of being launched under the minimum situation at the diameter that makes lens.Should be appreciated that equally with lens element shown in Figure 3 120, the two all is contained in a plurality of second planes of refraction 122 in the lens element 220 and a plurality of reflecting surface 223 satisfies above-mentioned equation (1) to (6).
In addition,, lens element 120 is configured to, makes from light source 110 with smaller or equal to θ according to first embodiment 0The incidence surface 124 that incides on it of the light of emission angle emission be the plane.But described incidence surface can be a curved surface, that is to say, described incidence surface can be, for example, and the incidence surface 324 of lens element 320 shown in Figure 6.When a plurality of first planes of refraction 321 and a plurality of second plane of refraction 322 alternately are provided on the emitting surface of lens element 320, and described a plurality of second plane of refraction 322 refraction and emission are during from the reflected light of a plurality of reflectings surface 323 on the incidence surface that is arranged on lens element 320, and lens element 320 can produce and identical effect mentioned above.Perhaps, incidence surface 324 can be the Fresnel lens surface.When the incidence surface 324 of lens element 320 has when being the sphere of spheroid at center with light source 110, incidence surface 324 is to the anaclasis of light source 110 emissions, therefore, and angle beta shown in Figure 3 1And β 2Between relation satisfy β 1=β 2Therefore, the two a plurality of second planes of refraction 322 and a plurality of reflecting surface 323 that all is included in the lens element 320 satisfies above-mentioned equation (1) to (6), thereby satisfies β 1=β 2And, when incidence surface 324 has other curved surfaces or Fresnel lens surface, can be according to the substitution of the execution of the refraction on the incidence surface 324 in equation (2).
In addition, according to first embodiment, provide a plurality of reflectings surface 123.But, can adopt the lens element 420 that is provided with single reflecting surface 423 rather than a plurality of reflecting surface 123 in shown in Figure 7 its.In this case, a plurality of second plane of refraction, 422 every persons can be designed to have suitable angle with respect to single reflecting surface 423.In this case, the brightness that might reduce the light of being launched equally changes, and raises the efficiency and emissive porwer, produces and identical effect mentioned above thus.
Next, will the angle of the lens surface of the angle of lens surface of single reflecting surface 423 and a plurality of second planes of refraction 422 be described in more detail.Fig. 8 is the side cross-sectional, view of the major part of light emission module shown in Figure 7, wherein, to the light emission module 100 of first embodiment lens element 420 has been installed.In Fig. 8, adopt the Reference numeral of identical correspondence to represent the parts identical, and will omit explanation it with parts shown in Figure 3.
As shown in Figure 8, the reflection of the first reflection spot Pa place on reflecting surface 423 is with emission angle α 1From the light of light source 110 emissions, wherein α 1Angle between expression optical axis 113 and the transmit direction.Make reflected light point to the second plane of refraction 422a, and the refraction point Qa place on the second plane of refraction 422a reflected, so along the direction that is parallel to optical axis 113 as the emission of emission light.Relation between the second plane of refraction 422a and the reflecting surface 423 is identical with the relation between the reflecting surface 123a with the second plane of refraction 122a that all is included in the lens element 120 that describes with reference to figure 3.Particularly, length r, L 1And L 2And angle β 1, β 2, α 1, α 2, α 2' and γ satisfy above-mentioned equation (1) to (6).
Next, the second plane of refraction 422b that directly is provided with around (immediatelysurrounding) second plane of refraction 422a from optical axis 113 will be described.With less than emission angle α 1The angle reflected from the second reflection spot Pb of light on reflecting surface 423 of light source 110 emission.Make reflected light point to the second plane of refraction 422b, and the refraction point Qb place on the second plane of refraction 422b reflected, so along the direction that is parallel to optical axis 113 as the emission of emission light.
α 2bBe illustrated in the second refraction point Qb place, angle between the light that is reflected at the second reflection spot Pb place and the line, described line are to obtain towards the extension of the inside of lens element 420 by making by make described reflected light that the emission light that refraction obtains takes place at the second refraction point Qb place.In addition, β 2bBe illustrated in the second refraction point Qb place, the line that is parallel to the straight line of optical axis 113 and the dip plane by making the second plane of refraction 422b is towards the angle of extending outside the lens element 420 between the line that obtains.In this case, as angle α 2bAnd β 2bWhen satisfying equation (7), the emission parallel light that is reflected at the second refraction point Qb place is in optical axis 113.
n 3·sin(π/2-β 2b)＝n 2·sin(π/2-β 2b-α 2b)……(7)
In addition, can provide the lens element shown in Figure 9 520 of ambient light source 110, to substitute lens element 420 shown in Figure 7.On the emitting surface of lens element 520, a plurality of first planes of refraction 521 and a plurality of second plane of refraction 522 alternately are provided,, produce thus and identical effect mentioned above from the reflected light of reflecting surface 523 by described a plurality of second planes of refraction 522 refractions and emission.Relation is identical between the useless superfluous words, the relation between a plurality of second planes of refraction 522 and the reflecting surface 523 and a plurality of second planes of refraction 422 that all are contained in lens element 420 and reflecting surface 423, that is to say, satisfies above-mentioned equation (1) to (7).
(second embodiment)
In first embodiment, utilize from light source to be in θ 0To θ 1Scope in the brightness that reduces the light of being launched of the light of emission angle emission change, realize light emission module thus with efficient performance, wherein, emission angle is meant the angle between optical axis and the transmit direction.According to second embodiment, utilize the light that does not directly arrive at lens element of light emitted, rather than from light source to be in θ 0To θ 1Scope in the light of emission angle emission, wherein, described emission angle is meant the angle between optical axis and the transmit direction.
Figure 10 is the top view according to the light emission module 600 of second embodiment of the invention, and Figure 11 is the side cross-sectional, view of light emission module 600 according to a second embodiment of the present invention.Figure 12 is the side cross-sectional, view according to the major part of the light emission module 600 of second embodiment of the invention.Figure 13 is the enlarged drawing of the B part of light emission module 600 shown in Figure 12.In Figure 10 to 13, adopt the Reference numeral of identical correspondence to represent the parts identical, and will omit explanation it with parts illustrated in figures 1 and 2.
Shown in Figure 10 to 13, light emission module 600 mainly comprises light source 110 and lens element 620.For example, light source 110 is LED.Light source 110 is engaged to cathode electrode 612a, and is electrically connected to anode electrode 612b by lead 612c.Lens element 620, cathode electrode 612a and anode electrode 612b are fixed to the shell 630 that constitutes by resin and/or analog.In addition, cathode electrode 612a comprises reverberator 641.Reverberator 641 has the reflecting surface of the interior shape that has formed (for example) inversion awl.Reverberator 641 can be fixed on the cathode electrode 612a.Perhaps, reverberator 641 can be by constituting with cathode electrode 612a identical materials, thereby integrated with cathode electrode 612a.
The same with lens element 120 shown in Figure 2, on the emitting surface of lens element 620, a plurality of first planes of refraction 121 and a plurality of second plane of refraction 122 alternately are provided, have the optical axis 113 that is positioned at its center to form every person, and have the concentric circles of mutually different diameter.A plurality of reflectings surface 623 are provided on the incidence surface of described lens element 620, have optical axis 113 that is positioned at its center and concentric circles with mutually different diameter to form every person.In addition, described a plurality of reflecting surface 623 is a plurality of fully reflecting surfaces.Have and light emission module identical construction according to first embodiment according to the light emission module 600 of second embodiment, just light emission module 600 has reverberator 641, and it is used to reflect the light from the side-emitted of light source 110, that is, from light source to be in θ 2To θ 3Scope in the light of emission angle emission, described emission angle is meant the angle between optical axis 113 and the transmit direction.Reverberator 641 reflection is from the light of the side-emitted of light source 110, and makes reflected light point to a plurality of reflectings surface 623 on the incidence surface that is arranged on lens element 620.Described a plurality of reflecting surface 623 passes through man-to-man basically corresponded manner with described a plurality of second planes of refraction 122 and interacts, therefore, will reflect towards described a plurality of second planes of refraction 122 by the reflected light of reverberator 641 guiding according to described one.Described a plurality of second plane of refraction 122 reflects reflected light, and from the described light through refraction of lens element 620 emissions.As mentioned above, according to first embodiment that describes with reference to figure 2, utilize shown in Figure 2 to be in θ 0To θ 1Scope in the light of emission angle emission, and, utilize from the light of the side-emitted of light source 110 according to second embodiment.Particularly, when adopting LED, provide high-power, therefore, can utilize from the electric power of the light of the side-emitted of light source, to improve the efficient of light emission module 600 from the light of the side-emitted of LED as light source 110.Described a plurality of reflecting surface 623 and described a plurality of second planes of refraction 122 interact by man-to-man corresponded manner basically, and will be from the light of the side-emitted of light source 110 towards 122 reflections of described a plurality of second planes of refraction according to described one.Described a plurality of second plane of refraction 122 reflects reflected light, and from the described light through refraction of lens element 620 emissions.In this case, the angle of described a plurality of reflectings surface 623 is set to, make light from lens element 620 with the expection angular emission (among Figure 12, making parallel light) in optical axis 113.
So formed a plurality of second planes of refraction 122, a plurality of reflecting surface 623 and reverberator 641, therefore from the light of the side-emitted of light source 110 from part emission corresponding to dark part shown in Figure 29, realized the reduction that the brightness of the light launched changes thus.In addition, with smaller or equal to θ 0Emission angle be emission in the zone of do all from the light of light source 110 emission with from the light of the side-emitted of light source 110 from the diameter of described a plurality of first planes of refraction 121, having improved diameter thus is the interior emissive power density in zone of do, and has realized realizing the light emitting module 600 of efficient performance.
As mentioned above, according to second embodiment, on the emitting surface of lens element 620, a plurality of first planes of refraction 121 and a plurality of second plane of refraction 122 alternately are provided, have the optical axis 113 that is positioned at its center to form every person, and have the concentric circles of mutually different diameter, and a plurality of reflectings surface 623 are provided on the incidence surface of lens element 620, have the optical axis 113 that is positioned at its center to form every person, and have the concentric circles of mutually different diameter.In addition, provide the reverberator 641 of ambient light source 110, thereby allow described a plurality of second plane of refraction 122 according to expecting angle refraction and emission light from the side of light source 110.Therefore, might be under the situation of the diameter that does not improve lens element 620, the brightness that reduces the light of being launched changes, and raises the efficiency and emissive porwer, realizes the light emission module 600 with favourable performance thus.
Second embodiment according to reference Figure 10 to 13 describes is configured to light emission module 600, by cremasteric reflex device 641 and a plurality of reflecting surface 623, thereby makes the light from the side of light source 110 point to a plurality of second planes of refraction 122.But, the invention is not restricted to this.Can adopt the light deflector such as prism to substitute reverberator 641, thereby utilize refraction to carry out deflection, as carrying out by reverberator 641, the light that makes light source 110 emissions is towards a plurality of reflecting surface 623 deflections thus.
In addition, can adopt a plurality of planes of refraction to substitute a plurality of reflectings surface 623.Figure 14 is the side cross-sectional, view that comprises the light emission module 700 of a plurality of planes of refraction that substitute a plurality of reflectings surface 623.Figure 15 is the side cross-sectional, view of the major part of light emission module 700.As shown in figure 15, light emission module 700 is configured to, utilizes a plurality of third reflect faces 725 that on the incidence surface of lens element 720, provide to make reflected light point to a plurality of second planes of refraction 122 from reverberator 741.This structure allows effective land productivity to use light from the side of light source 110, raises the efficiency and emissive porwer, and reduces radiative brightness and change.
Lens element shown in Figure 15 720 is configured to, a plurality of third reflect faces 725 are provided on its incidence surface.But, can adopt lens element shown in Figure 16 820, wherein, adopt single third reflect face 825 to substitute a plurality of third reflect faces 725.In this case, a plurality of second plane of refraction, 822 every persons can be designed to have suitable angle with respect to single third reflect face 825.Thereby the brightness that might reduce the light of being launched changes, and raises the efficiency and emissive porwer, produces and identical effect mentioned above thus.
In addition, can adopt lens element shown in Figure 17 920 to substitute lens element 820 shown in Figure 16, thereby make lens element 920 ambient light sources 110 and reverberator 941.Equally in this case, on the emitting surface of lens element 920, alternately provide a plurality of first planes of refraction 921 and a plurality of second plane of refraction 922, thereby by a plurality of second planes of refraction 922 refractions and the emission reflected light from reverberator 941.Therefore, might effectively utilize light, reduce radiative brightness and change, and raise the efficiency and emissive porwer, produce effect same as described above thus from the side of light source 110.
In addition, according to second embodiment, the reverberator reflection is from the light of the side of light source 110, to improve the efficient of light emission module.But as shown in figure 18, reverberator 1041 can reflect from light source 110 to be in θ 0To θ 1Scope in the light of emission angle emission, described reflected light can incide on the single third reflect face 1025 of lens element 1020, thereby is subjected to the refraction of a plurality of second planes of refraction 1022, can utilize described refract light, reduce radiative brightness thus and change, and raise the efficiency.
(the 3rd embodiment)
Figure 19 is top view and the side cross-sectional, view according to the Optical Receivers 2100 of third embodiment of the invention.Figure 20 is the side cross-sectional, view according to the major part of the Optical Receivers 2100 of third embodiment of the invention.
As Figure 19 and shown in Figure 20, Optical Receivers 2100 mainly comprises light receiving element 2110 and lens element 2120.For example, can adopt photodiode (PD) as light receiving element 2110.Light receiving element 2110 is received in the encapsulation 2111.In shell 2130, encapsulation 2111 and lens element 2120 are fixed on the position that can satisfy predetermined location relationship therebetween.Optical Receivers 2100 receives light signal from wireless optical transmitter (not shown) (for example, by the light signal of light emission module 100 emissions of first embodiment), and described wireless optical transmitter is set in the face of Optical Receivers 2100.
The incident light that lens element 2120 is collected on the light receiving element 2110.Light receiving element 2110 is converted into electric signal with the light signal that receives, and from the described electric signal of terminal 2112 outputs, realizes the wireless optical transmission of information data thus.Collect when having reduced the power of the light that is received at the poor efficiency of incident light, described wireless optical transmission system can only provide the transmission range of reduction.Therefore, lens element 2120 is designed to improve light collection efficiency.As shown in figure 20, lens element 2120 has a plurality of first planes of refraction 2121 on its incidence surface, described a plurality of first plane of refraction 2121 is set to form concentric circles, and each described concentric circles has the optical axis 2113 that is positioned at its center, and has mutually different diameter.Described a plurality of first plane of refraction, 2121 every persons reflect a part of incident light, to collect the incident light on the light receiving element 2110.Figure 20 show collect the incident light be parallel to optical axis 2113 situation as an example.That is to say that described a plurality of first planes of refraction 2121 play a part typical Fresnel lens.Thereby that adopts in described a plurality of first planes of refraction 2121 and the conventional Optical Receivers shown in Figure 30 is the same.
Next, with the difference between the Optical Receivers 2100 of conventional Optical Receivers of description and a third embodiment in accordance with the invention.Except the lens of conventional Optical Receivers, the lens element 2120 of the Optical Receivers 2100 of a third embodiment in accordance with the invention has a plurality of second planes of refraction 2122 on the incidence surface that is formed at lens element 2120.In addition, a plurality of reflectings surface 2123 are formed light guiding section, it is used to collect the light that is subjected to a plurality of second plane of refraction refractions, makes it to point to light receiving element.
Described a plurality of second plane of refraction 2122 and a plurality of first plane of refraction 2121 alternately are provided on the incidence surface of described lens element 2120, thereby make it to form the concentric circles that every person has the optical axis 2113 that is positioned at its center.The shape that the lens surface of described a plurality of second planes of refraction 2122 has has prevented that lens element 2120 from comprising the invalid part of lens (corresponding to the oblique line part among Figure 20) of the lens 21 of Figure 30 and conventional Optical Receivers shown in Figure 31.That is to say that lens element 2120 does not comprise that obstruction collects invalid part on the light receiving element 2110 with incident light.
A plurality of reflectings surface 2123 are provided on the emitting surface of described lens element 2120, have optical axis 2113 that is positioned at its center and concentric circles with mutually different diameter to form every person.In addition, described a plurality of reflecting surface 2123 is a plurality of fully reflecting surfaces.In addition, at the described a plurality of reflectings surface 2123 of the outer setting in a zone, the light that is reflected by a plurality of first planes of refraction 2121 passes described zone, thereby makes it to collect on the light receiving element 2110.Be refracted into the light that is mapped on a plurality of first planes of refraction 2121 by a plurality of first planes of refraction 2121, and make it to collect on the light receiving element 2110.Therefore, when the light on will inciding a plurality of first planes of refraction 2121 is collected on the light receiving element 2110, do not produce optical loss.Described a plurality of reflecting surface 2123 is so that man-to-man corresponded manner and a plurality of second plane of refraction 2122 interact basically.Described a plurality of second plane of refraction 2122 reflects incident light according to described one towards described a plurality of reflectings surface 2123.Described a plurality of reflecting surface 2123 reflects described refract light towards described light receiving element 2110.In this case, the angle of a plurality of reflectings surface 2123 is made as, the light that will be subjected to 2122 refractions of a plurality of second planes of refraction is towards light receiving element 2110 reflections.
As mentioned above, described a plurality of second planes of refraction 2122 and a plurality of reflecting surface 2123 are formed, permission will be collected incident light partly from non-light shown in Figure 31 and be collected on the light receiving element 2110, and realization has the Optical Receivers 2100 of the light collection efficiency of enhancing thus.In addition, compare with the typical Fresnel lens of routine, under the situation of the diameter that does not improve lens element 2120, when the distance between the outermost contour of optical axis 2113 and a plurality of reflecting surface 2123 smaller or equal between the outermost contour of optical axis 2113 and a plurality of first planes of refraction 2121 apart from the time (that is to say, diameter d i is smaller or equal to diameter d o), might improve the light collection efficiency of Optical Receivers 2100.More particularly, at light to pass in the conventional light receiving element that the mode of the mode contrary of conventional light emission module shown in Figure 28 passes therethrough with light, must improve the diameter of lens 12, because will be collected into the incident light that is mapped to corresponding on the incidence surface of the part outside the outermost contour of a plurality of planes of refraction 13 (promptly being positioned at the part outside the zone that diameter is d1).On the other hand, according to the 3rd embodiment, incident light on a plurality of second planes of refraction 2122 is reflected, and by the described refract light of a plurality of reflecting surface 2123 reflections, thereby make it to be collected, wherein, described a plurality of second planes of refraction 2122 are configured to, make distance between the outermost contour of optical axis 2113 and a plurality of second planes of refraction 2122 less than the distance between the outermost contour (edge of diameter d o) of optical axis 2113 and a plurality of first planes of refraction 2121.Therefore, might under the situation of the diameter that does not improve lens element 2120, raise the efficiency.
As mentioned above, according to the 3rd embodiment, described a plurality of first plane of refraction 2121 and a plurality of second plane of refraction 2122 alternately are provided on the incidence surface of lens element 2120, has the optical axis 2113 that is positioned at its center to form every person, and concentric circles with mutually different diameter, incident light on a plurality of second planes of refraction 2122 is reflected towards a plurality of reflectings surface 2123, described a plurality of reflecting surface 2123 is arranged on the emitting surface of lens element 2120, thereby formed every person and had the optical axis 2113 that is positioned at its center, and have a concentric circles of mutually different diameter, described a plurality of reflectings surface 2123 with described refract light towards light receiving element 2110 reflections.Therefore, the incident light of collecting on the part partly corresponding to the non-light of Fresnel lens can be collected on the light receiving element 2110, thus the Optical Receivers 2100 that might realize having favourable performance and can under the situation of the diameter that does not improve lens element 2120, improve its light collection efficiency.
In addition, the mode that incides the mode contrary that the light on the Optical Receivers of the 3rd embodiment passes therethrough with the light with the light emission module emission of first embodiment passes therethrough.Therefore, the light emission module of first embodiment can be used as the Optical Receivers of the 3rd embodiment.
Can adopt with identical mode design packet that lens element shown in Figure 3 120 is adopted and be contained in angle according to the lens surface of a plurality of second planes of refraction 2122 in the lens element 2120 of the Optical Receivers of the 3rd embodiment and a plurality of reflecting surface 2123.In addition, the same with a plurality of reflecting surface 123, described a plurality of reflectings surface 2123 can be a plurality of fully reflecting surfaces.Perhaps, for example, can be to described a plurality of reflecting surface plated metals, to form a plurality of reflectings surface 2123 that can realize estimated performance.
The same with light emission module shown in Figure 4, the Optical Receivers of the 3rd embodiment can be configured to, light receiving element is fixedly installed in the encapsulation.
The same with lens element 220 shown in Figure 5, the lens element of the Optical Receivers of the 3rd embodiment can be configured to, make distance between the outermost contour of optical axis 2113 and a plurality of reflectings surface greater than the distance between the outermost contour of optical axis 2113 and a plurality of first planes of refraction, that is, diameter d i is greater than diameter d o.
The same with lens element 320 shown in Figure 6, on the lens element of the Optical Receivers of the 3rd embodiment, the emitting surface except that a plurality of reflectings surface 2123 can comprise curved surface.Perhaps, described emitting surface can comprise the Fresnel lens surface, rather than a plurality of reflecting surface 2123.
The same with lens element 420 shown in Figure 7, the lens element of the Optical Receivers of the 3rd embodiment can have single reflecting surface rather than a plurality of reflecting surface 2123.In this case, can according to the angle of the lens surface of single reflecting surface in identical mode design packet that lens element 420 shown in Figure 8 is adopted is contained in the lens element of Optical Receivers and a plurality of second planes of refraction.
The same with lens element 520 shown in Figure 9, the lens element of the Optical Receivers of the 3rd embodiment can be configured to, make lens element surround light receiving element.
Can adopt any above-mentioned structure realization to have the Optical Receivers of the light collection efficiency of advantageous property and raising.
(the 4th embodiment)
Figure 21 is the top view of the Optical Receivers 2600 of a fourth embodiment in accordance with the invention, and Figure 22 is the side cross-sectional, view of the Optical Receivers 2600 of a fourth embodiment in accordance with the invention.Figure 23 is the side cross-sectional, view according to the major part of the Optical Receivers 2600 of fourth embodiment of the invention.In Figure 21 to 23, adopt the Reference numeral of identical correspondence to represent and Figure 19 and the identical parts of parts shown in Figure 20, and will omit explanation it.
Shown in Figure 21 to 23, Optical Receivers 2600 mainly comprises light receiving element 2110 and lens element 2620.For example, can adopt photodiode (PD) as light receiving element 2110.Light receiving element 2110 is engaged to anode electrode 2612a, and is electrically connected to cathode electrode 2612b by lead 2612c.Lens element 2620, anode electrode 2612a and cathode electrode 2612b are fixed on the shell 2630 that is made of resin and/or analog.In addition, anode electrode 2612a comprises reverberator 2641.Reverberator 2641 has the light reflection surface of the interior shape that has formed (for example) inversion awl.Reverberator 2641 can be fixed on the anode electrode 2612a.Perhaps, can be by forming reverberator 2641 with anode electrode 2612a identical materials, thus make it integrated with anode electrode 2612a.
The same with lens element 2120 shown in Figure 20, a plurality of first planes of refraction 2121 and a plurality of second plane of refraction 2122 alternately are set, to form the concentric circles that every person has the optical axis 2113 that is positioned at its center on the incidence surface of lens element 2620.A plurality of reflectings surface 2623 are provided on the emitting surface of described lens element 2620, have optical axis 2113 that is positioned at its center and concentric circles with mutually different diameter to form every person.In addition, described a plurality of reflecting surface 2623 is a plurality of fully reflecting surfaces.Optical Receivers 2600 according to the 4th embodiment has and the structure the same according to the Optical Receivers of the 3rd embodiment, and just Optical Receivers 2600 has reverberator 2641, and it is used for the light that further reflection is subjected to a plurality of reflecting surface 2623 reflections.Described a plurality of reflecting surface 2623 is so that man-to-man corresponded manner and a plurality of second plane of refraction 2122 interact basically.Described a plurality of second plane of refraction 2122 reflects incident light according to described one towards described a plurality of reflectings surface 2623.Described a plurality of reflecting surface 2623 is with 2641 reflections of refract light orientating reflex device.Reverberator 2641 reflects described reflected light towards light receiving element 2110.In this case, the angle of described a plurality of reflectings surface 2623 is made as, make described a plurality of reflecting surface 2623 with light with the expection angle towards light receiving element 2110 reflections.
With describe at the 3rd embodiment the same, described a plurality of second planes of refraction 2122, a plurality of reflecting surface 2623 and reverberator 2641 are formed, will collect on the light receiving element 2110 from non-light collection incident light partly shown in Figure 31.
As mentioned above, according to the 4th embodiment, a plurality of first planes of refraction 2121 and a plurality of second plane of refraction 2122 alternately are provided on the incidence surface of lens element 2620, has the optical axis 2113 that is positioned at its center with formation, and concentric circles with mutually different diameter, a plurality of reflectings surface 2623 are provided on the emitting surface of lens element 2620, the reverberator 2641 that surrounds light receiving element 2110 is provided in addition, thereby, the incident light of collecting part from the non-light of Fresnel lens might be collected on the light receiving element 2110.Therefore, can be implemented in the diameter that makes lens element 2620 and reduce to the Optical Receivers 2600 that has the light collection efficiency of advantageous property and raising minimum the time.
The 4th embodiment according to reference Figure 21 to 23 describes is configured to Optical Receivers 2600, by cremasteric reflex device 2641 and a plurality of reflecting surface 2623, the incident light on a plurality of second planes of refraction 2122 is guided towards light receiving element 2110.But, the invention is not restricted to this.Can adopt such as the alternative reverberator 2641 of the light deflector of prism, described light deflector is used for adopting refraction to carry out deflection, thereby carries out as reverberator 2641, makes the light that is reflected by a plurality of reflectings surface 2623 towards light receiving element 2110 deflections.
In addition, the mode that incides the mode contrary that the light on the Optical Receivers of the 4th embodiment passes therethrough with the light with the light emission module emission of second embodiment passes therethrough.Therefore, the light emission module of second embodiment can be used as the Optical Receivers of the 4th embodiment.
The Optical Receivers of the 4th embodiment can have lens element shown in Figure 24 2720, wherein, provides a plurality of third reflect faces 2725 to substitute a plurality of reflectings surface 2623.In this case, cremasteric reflex device 2741, thus will collect on the light receiving element 2110 by the light of a plurality of third reflect face 2725 refractions.
Lens element 2720 shown in Figure 24 has a plurality of third reflect faces 2725 on the emitting surface that is positioned at lens element 2720.But, lens element 2820 shown in Figure 25 can be provided, wherein, adopted single third reflect face 2825, rather than a plurality of third reflect face 2725.In this case, cremasteric reflex device 2841, thus will collect on the light receiving element 2110 by the light of single third reflect face 2825 refractions.
In addition, can adopt the lens element 2920 of encirclement light receiving element 2110 shown in Figure 26 and reverberator 2941 to substitute lens element 2820 shown in Figure 25.
Can adopt any above-mentioned structure realization to have the Optical Receivers of the light collection efficiency of advantageous property and raising.
In the above description, each the foregoing description is applied to the wireless optical transmission system.But, the invention is not restricted to this.Permission reduces the brightness variation according to the light emission module of the every person among first embodiment and second embodiment with the thickness that dwindles, and the radiosity of raising the efficiency.Permission improves light collection efficiency according to the Optical Receivers of the every person among the 3rd embodiment and the 4th embodiment.Therefore, the present invention can be effectively applied to other purposes.For example, the present invention is applicable to the optical sensor of the light that illumination and utilization are transmitted etc. in free space.
Although described the present invention in detail,, and be nonrestrictive in any case above-mentioned explanation all is for illustrational purpose.Should be appreciated that and under the situation that does not deviate from scope of the present invention, to design a lot of other modifications and variations.

Claims (11)

1. light emission module, it comprises light source and is used for the spread angle that the light with described light emitted launches and be reduced to predetermined angular, and with the radiative lens element of this predetermined angular, wherein
Described lens element comprises
A plurality of first planes of refraction, it is arranged on the emitting surface of described lens element, and forming with the optical axis is the different concentric circles of diameter at center, and described a plurality of first planes of refraction are used for reflecting from described light source to be in 0 to θ 0Scope in the first emission light of emission angle emission, thereby launch the described first emission light with described predetermined angular, this emission angle is meant described optical axis and launches angle between the described first radiative direction,
It is the different concentric circles of diameter at center that a plurality of reflectings surface, its plane of incidence at described lens element form with described optical axis, will be from described light source with greater than θ 0The second emission light of emission angle emission guide to the described emitting surface of described lens element, this emission angle is meant described optical axis and the angle of launching between the described second radiative direction, and
A plurality of second planes of refraction, it is arranged on the described emitting surface of described lens element, formation is the different concentric circles of diameter at center with described optical axis, described a plurality of second plane of refraction is used to reflect the described second emission light by described a plurality of reflecting surface guiding, thereby launch the described second emission light with described predetermined angular, wherein, described a plurality of second plane of refraction and described a plurality of first plane of refraction are arranged alternately on the described emitting surface of described lens element;
Described a plurality of reflecting surface is corresponding one to one with described a plurality of second planes of refraction.
2. light emission module according to claim 1, wherein, described a plurality of reflectings surface comprise at least one fully reflecting surface.
3. light emission module according to claim 1 also comprises reverberator, and it is used for the described second emission light of described light emitted is guided to described a plurality of reflecting surface.
4. light emission module according to claim 3, wherein, described reverberator reflects described second of described light emitted to be launched in the light to be in θ 2To θ 3Scope in the emission light of emission angle emission, described emission light can't directly arrive at described lens element, wherein, described emission angle is meant described optical axis and the angle of launching between the described radiative direction.
5. light emission module according to claim 1, wherein, the distance between the outermost contour of described optical axis and described a plurality of reflectings surface is smaller or equal to the distance between the outermost contour of described optical axis and described a plurality of first planes of refraction.
6. light emission module according to claim 1, wherein, the shape that described a plurality of second planes of refraction have has been eliminated the photoemissive invalid part of the emission that hinders described light emitted from the described emitting surface of described lens element.
7. Optical Receivers, it comprises light receiving element and is used for light is collected lens element on the described light receiving element, wherein
Described lens element comprises
A plurality of first planes of refraction, it is arranged on the incidence surface of described lens element, and forming with the optical axis is the different concentric circles of diameter at center, and described a plurality of first planes of refraction are used to reflect the part of incident light, thereby described incident light is collected on the described light receiving element
A plurality of second planes of refraction, it is arranged on the described incidence surface of described lens element, formation is the different concentric circles of diameter at center with described optical axis, described a plurality of second plane of refraction is used for reflecting other parts of described incident light, wherein, described a plurality of second plane of refraction and described a plurality of first plane of refraction are arranged alternately on the described incidence surface of described lens element, and
A plurality of reflectings surface, it is arranged on such position is the different concentric circles of diameter at center to form with described optical axis, to prevent to be subjected to described a plurality of first plane of refraction refraction, so that the light that is collected on the described light receiving element passes therethrough, described a plurality of reflectings surface are used for the light that is subjected to described a plurality of second plane of refraction refractions is collected described light receiving element;
Described a plurality of reflecting surface is corresponding one to one with described a plurality of second planes of refraction.
8. Optical Receivers according to claim 7, wherein, described a plurality of reflectings surface comprise at least one fully reflecting surface.
9. Optical Receivers according to claim 7 also comprises reverberator, and it is used for and will collects described light receiving element by the light of described a plurality of reflecting surface guiding.
10. Optical Receivers according to claim 7, wherein, the distance between the outermost contour of described optical axis and described a plurality of reflectings surface is smaller or equal to the distance between the outermost contour of described optical axis and described a plurality of first planes of refraction.
11. Optical Receivers according to claim 7, wherein, the shape that described a plurality of second planes of refraction have has been eliminated from the described incidence surface of described lens element and has been hindered described incident light and be collected into invalid part on the described light receiving element.
CN2007101666700A 2006-11-06 2007-11-05 Light emitting module and light receiving module Expired - Fee Related CN101178447B (en)

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