CN101813795A - Optical rotary joint, method for installing optical rotary joint in correct alignment manner and optical reflector device used therein - Google Patents
Optical rotary joint, method for installing optical rotary joint in correct alignment manner and optical reflector device used therein Download PDFInfo
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- CN101813795A CN101813795A CN200910209124A CN200910209124A CN101813795A CN 101813795 A CN101813795 A CN 101813795A CN 200910209124 A CN200910209124 A CN 200910209124A CN 200910209124 A CN200910209124 A CN 200910209124A CN 101813795 A CN101813795 A CN 101813795A
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Abstract
The invention discloses an optical rotary joint, a method for installing the optical rotary joint in a correct alignment manner and an optical reflector device used therein. The invention generally relates to the optical rotary joint (35), an improved method for installing the optical rotary joint on a bracket and an improved optical reflector device applying the optical rotary joint. The improved optical rotary joint realizes optical communication between a rotor and a stator; the rotor is provided with a longitudinal shaft and comprises at least a light source (36) installed on one of the rotor and the stator and at least a first reflector (38) installed on the other one of the rotor and the stator. The first reflector comprises a first concave reflecting surface, a second reflector (39) with a second reflecting surface (45) and a receiver (40), wherein the second reflector is configured to be partially conical and placed on the second focus of the elliptical area, and the receiver (40) configured to receive the light reflected by the second reflecting surface.
Description
The application is to be that April 28, application number in 2006 are 200680000934.9, denomination of invention is divided an application for " optic rotary joint is according to the method for correct alignment so installing optical rotary joint and wherein used optical reflector device " a case the applying date.
Technical field
The present invention relates generally between rotor and stator, to realize the optic rotary joint of optical communication, improving one's methods of this optic rotary joint is installed on supporting structure, this method can make rotor and stator keep correctly aiming at, and the improvement optical reflector device that is used for this optic rotary joint.
Background technology
The present invention to K.Peter Lo and Norris E.Lewis on Dec 27th, 2005 at U.S.Pat.No.6,980, the various communicators of describing in 714 propose to improve, and the title of this patent is " Fiber Optic Rotary Joint and Associated ReflectorAssembly ".The communicator of describing in the patent of ' 714 can be such as the rotation interface transmitting data between rotor and the stator and/or power (following be referred to as sometimes " communication ").
For example, computed tomography analysis (CT) scanner requires to realize data transmission on the rotation interface.In order to realize this data transmission, utilize slip ring usually.Slip ring has rotating element that utilizes the rotor rotation and the stationary element that is fixed to stator.The slip ring of initial design is the telecommunication that is used to support between rotor and the stator.Yet when data rate increased, the circuit transmission data became unrealistic.So people have developed optic rotary joint, be used to be supported in the higher data transmission rate on the rotation interface.Optical communication can be to be higher than the rate transmissioning data of existing electrical communication technology far away.
Existing optical communication technique on the rotation interface comprises: (for example use waveguide, consult and gave Norris E.Lewis on September 17th, 2002, the U.S.Patent No.6 of Anthony L.Bowman andRobert T.Rogers, 453,088, its title is " SegmentedWaveguide for Large Diameter Fiber Optic Rotary Joint "; Gave Norris E.Lewis on August 15th, 2000, Anthony L.Bowman, the U.S.Patent No.6 of Robert T.Rogersand Michael P.Duncan, 104,849, its title is " FiberOptic Rotary Joint "; With gave Norris E.Lewis on November 23rd, 1999, AnthonyL.Bowman, the U.S.PatentNo.5 of Robert T.Rogers and Michael P.Duncan, 991,478, its title is " Fiber Optic Rotary Joint "), (for example use optical fiber, consult and gave Georg Lohr on November 18th, 2003, the U.S.Patent No.6 of Markus Stark and HansPoisel, 650,843, its title is " Device for the OpticalTransmission of Signals ", (for example propagate with the use free space, consult and gave Suzuki Tatsuro on February 12nd, 1997, the Japanese Pat.Pub.No.09-308625 of Teimoshii Aari Fuotsukusu and TomuHaatofuoodo, its title is " OpticalTransmission System ").Combining herein and disclosing these lists of references is that conduct is to the structure of this prior art optic rotary joint and the reference of operation.
In the application of CT scanner, the axle of its rotor rotation is to take by patient is actual sometimes, and adopt usually from the axle swivel adapter head can be between rotor and stator transmission signals.Thisly comprise one or more light sources that are used to launch light signal usually, and have the curved reflector of channel shape xsect to receive this signal that is launched and guide this received signal to each optical receiver from the axle swivel adapter head.Light source is that in rotor and the stator is spacedly distributed ringwise, and reverberator and receiver to be in rotor and the stator another be spacedly distributed ringwise.Light source can comprise one or more common light sources, and relevant one circumference on, maybe can around this circumference independent light-emitting component be installed by fiber guides in rotor and the stator from the light signal of light source.For example, light source can be circular distribution around rotor, and a plurality of reverberator and receiver can be circular distribution around stator, thereby supports the optical communication from the rotor to the stator.Under most situation, the light data transfer path of (that is, between rotor and stator) is along with respect to armature spindle radially on swivel adapter head.In other words, if only be transferred to stator from rotor, then see only from armature spindle, for example, it has nothing to do with the physical location of light source.
When operation, each light source may be launched identical light signal.These signals can transmit on the interface in rotation, and can be received by one or more reverberators and be directed into relevant receiver, and it depends on the angle position of rotor with respect to stator.In other embodiment, different light signals can be from different light emitted, and perhaps, if light signal is from identical light source, then these light signals can be re-used.
Though it is normally effective to carry out optical communication between rotor and stator, adopting thisly has the routine of the curved reflector of channel shape xsect to have several important disadvantages from the axle swivel adapter head, particularly under the situation of high data rate.These problems comprise: (a) because the long light transmission path of different journey, the pulse width of stack is strengthened, (b) with light signal be directly incident on the photoelectric detector situation relatively, when transmitting the input end that enters optical fiber, must use a large amount of light sources, as discussed below.
For example, routine in the axle swivel adapter head, therefore the path transmission that light signal can be along each light source and different journeys are long between the receiver separately when these signals stacks, can be received at each and introduce time delay in light signal.Specific receiver may be from two light source received signals that annular is adjacent.If identical light signal is launched simultaneously by two adjacent light source, but the different distance of these signal transmission arrives receiver, and then these two signals are received in the different time.Therefore, these two signals are out of phase, and the pulse width of the superposed signal that receiver receives is expanded effectively.In order to be supported in the communication under the desirable high data rate, conventional has been designed to have less spacing particularly from the axle swivel adapter head between light source and receiver, in order to make the optical length minimum of signal transmission.Even so, be higher than under the data rate of 1.25Gbit/sec, supporting that the error-free data transmission is difficult, wherein signal is along the long path transmission of different journeys.
Above-mentioned a kind of optic rotary joint of ' 741 patent disclosure and relevant reflector arrangement are used for realizing optical communication between rotor and stator.By the design light signal is along the optic rotary joint that equates the journey longer transmission, and the pulse width of the superimposed light signal of receiver reception is no longer increased.
In order to achieve this end, the imagination of ' 741 patent is that swivel adapter head includes the reflector arrangement of recessed oval reflecting surface, also can be the reflector arrangement that the hyperbolic reflecting surface is arranged.These two kinds of shapes all are bell-shaped curve on the rectangular coordinate system plane on (that is, by the definite plane of x-y axle), and the definition of bell-shaped curve is following general formula: Ax
2+ Bxy+Cy
2+ Dx+Ey+F=0 is A wherein, B, and C, D, E and F are constants.Under the situation of ellipse, B
2＜4AC; And under hyp situation, B
2＞4AC.Under the situation of ellipse, any point to two focus (F from the curve
1, F
2) be constant apart from sum.If reflecting surface is configured to the ellipse of part, then can be reflexed to another focus by this oval reflecting surface from the light that a focus is sent.Yet light is constant from the light path total length that a focus is transferred to another focus, and it is irrelevant with the particular location that emission light incides the point on the oval reflecting surface.On the contrary, under the situation of hyperbolical reflecting surface, the difference of the distance of any point to two fixed-focus is constant on the curved reflective surface.
The several different optical arrangement of ' 741 patent disclosure.In certain configuration of these configurations, received signal is directly to focus on the photodiode.In other configuration, received signal is to focus on the optic fibre input end of communicating by letter with long-range photodiode.In other other configuration, the position of convergent lens is at optic fibre input end, can guide received signal to enter optical fiber.
Yet the acceptance angle of optical fiber is compared with the acceptance angle of photodiode and is subjected to bigger restriction.Its main cause is that the numerical aperture of optical fiber (NA) is less than the numerical aperture of photodiode.The limited NA of optical fiber can limit the acceptance angle that light is directed into optical fiber.Therefore, this receives restriction with regard to the design that makes reflecting surface, and light is directed into the input end that receives optical fiber by this reflecting surface.In fact, the situation that is directly incident on photodiode with light signal compares, and is to be directed under the situation of optical fiber at first at the signal of launching, and this requirement for restriction uses the more light source of big figure.
Referring now to accompanying drawing, Fig. 1 and Fig. 2 of the application is equivalent to Fig. 1 and the Fig. 2 in the patent of ' 714 basically, and different is their reference number.Therefore, these accompanying drawings disclose the optic rotary joint 20 of prior art, and wherein each light source 21 is installed on the rotor 22.As if light beam is radially to be directed outwardly, and they are from the focal point F on the rotor turning axle
1Light beam incides on the oval reflecting surface 23 of reverberator 24, and is arrived conjugate focus F by retroeflection
2Yet this folded light beam incident is placed on the hyperbolical reflecting surface 25 between oval reflecting surface and the back focus B and again by secondary reflection more forward, and this beam reflected forward is focused on the receiver 2 that is positioned at conjugate focus C.The back focus B of hyperbolical reflecting surface 25 is the conjugate focus F with oval reflecting surface 23
2Overlap.
A kind of optic rotary joint of ' 714 patent disclosure, wherein it allows to transmit the high bandwidth light signal to stator from rotor, and vice versa.At light signal is to be transferred to from rotor under the situation of stator, and a plurality of light sources are evenly distributed in around the rotor.The required number of light sources of continuous data transfer depends on the acceptance angle θ of ellipsoidal reflector on the rotation interface.The definition of acceptance angle θ is, can be directed in the receiver angle of the oval reflecting surface of measuring from rotor center at the light of light source.Acceptance angle θ is optical length and the function that receives the acceptance angle φ of optical fiber or photoelectric detector, wherein φ=2 * sin
-1(NA)
Can be carried out continuously in order to ensure optical communication, on all relative positions, angle of rotor and stator, at least one light source must be in the acceptance angle of ellipsoidal reflector.For example, if receive the NA=0.37 of optical fiber, then the acceptance angle of this configuration is φ=13.6 °, as shown in Figure 3.Beyond the restriction of this acceptance angle, light signal is inevitable decays in the covering of optical fiber, and can not arrive photoelectric detector.For the light source at interval that is evenly distributed around rotor, on all these relative positions, angle, at least one light source is in the acceptance angle that receives optical fiber, then needs 27 light sources (that is 27 light sources of, 360 °/13.6 °=26.47 ≈) at least.
On the other hand, if utilize photoelectric detector as receiver, and if the NA=0.74 of photoelectric detector, therefore, its acceptance angle φ is widened to 32 °, then only need 12 equally spaced light sources of annular (that is 12 light sources of, 360 °/32 °=11.25 ≈) to guarantee continuous communication at peritrochanteric.Relevant with the specific design of photodiode shell, acceptance angle can be up to 140 ° (NA=0.94).
Therefore, for the number that reduces light source and reduce cost and the complicacy of system, more advantageously, can make received signal be directly incident on photoelectric detector, rather than at first incide the input end of optical fiber, again along this Optical Fiber Transmission to long-range photoelectric detector.In addition, short optical length is arranged between requirement and the photoelectric detector also, it can reduce the angular tolerance under production environment.
Fig. 4 in ' 714 patent that referring now to Fig. 4 of the application, it corresponds essentially to, different is their reference number, ' 714 patent also discloses an embodiment 28, wherein use single ellipsoidal reflector 29 (that is, not having the hyperbolical reverberator of cooperation), and conjugate focus F
2It is radial outside at rotor.In this configuration, reverberator 29 has oval reflecting surface 30, and it is arranged to the input end that light beam that focusing radially penetrates from light source 31 enters optical fiber 32 outwardly, and this optical fiber is to communicate with long-range photoelectric detector (not shown).The input end of optical fiber is the conjugate focus F with ellipsoidal reflector
2Overlap.
Entered optical fiber 32 if reflected light directly guides, the limited NA that then receives optical fiber requires a large amount of light sources to be spacedly distributed around rotor equally.For example, if the NA=0.37 of optical fiber utilizes geometric analysis method, then the acceptance angle θ of reverberator is 9.7 °, and wherein the optical length of 210mm is that edge from rotor is to receiver.Can guarantee from the rotor to the stator, to realize continuous data transmission for the arrangement that makes rotor, need 38 light sources (that is 38 light sources of, 360 °/9.7 °=37.11 ≈) at least.
This two examples explanation, if folded light beam is to be directly incident on the receiver that big NA is arranged, for example, and photoelectric detector, rather than guiding enters the optic fibre input end of receiver, then can reduce the number of light source, thus can reduce cost and the complicacy of system.
Though the optical fiber rotary joint in the patent of ' 714 can be realized high data transmission on the rotation interface, but need provide the improved long optical fiber rotary joint of constant journey that has, wherein it can be under approximately greater than the data rate of 1.25Gbit/sec transmitting optical signal, lower insertion loss is arranged, can be with to use optical fiber to enter the mode of remote receiver compatible, use is than the light source of peanut, and the optical length that minimum is arranged.
Summary of the invention
By the corresponding component in the reference disclosed embodiment, part or surface, only be for convenience of explanation, rather than limited, the present invention provides improved optic rotary joint widely, improving one's methods of this optic rotary joint is installed on support, and the improvement optical reflector device that is used for this optic rotary joint.
Aspect first, the invention provides a kind of optic rotary joint (35), can realize optical communication between rotor and stator, rotor has the longitudinal axis, comprise: at least one light source (36) of installing above one in rotor and stator is used for along the radial emission light signal with respect to the rotor longitudinal axis; At least one first reverberator (38) of installing above in rotor and stator another is used to reflect the light signal from light emitted; First reverberator comprises: recessed first reflecting surface (44) has been configured to the first focus (F taking from by the line on the plane of first reflecting surface (L)
1) and the second focus (F
2) the part ellipse, the position of first focus be with rotor the axle overlap substantially; Second reverberator (39) that second reflecting surface (45) is arranged, it is configured to the taper shape of part, and is placed on second focus of elliptical area, is used to receive from the light of first reflecting surface reflection and along different direction reflected light, as the function of the second reflecting surface drift angle; And receiver (40), it is arranged to reception by the light of second reflecting surface reflection.
In a kind of preferred form, first reflecting surface (44) disposes and is arranged to like this, and the area that light incides on second reflecting surface incides area on first reflecting surface less than light.Preferably, the light that reflects from first reflecting surface is focused into second focal point F
2On a hot spot.First reflecting surface can be configured to the elliptical area of part.As utilizing herein, the definition of elliptical area is a geometric surface, and its all planar cross-sectional are oval and circular.
More than first light source can be installed in above in rotor and the stator one, and more than second first reverberator is installed in above in rotor and the stator another.More than first numbers with more than second can be inequality.
Improved optic rotary joint can also comprise: the optical fiber (41) that input end and output terminal are arranged.Input end can be arranged near second focus or its.Receiver can be arranged near output terminal or its.Receiver can be a photodiode.
Improved optic rotary joint can also comprise: be arranged near the combination of lenses (40) second focus adjacent with input end, be used for direct light and enter optical fiber (41).This combination of lenses can comprise a series of lens, for example, two plano-convex lenss, lens and a holographic element, or the like.
Improved optic rotary joint can also comprise: prism is used for further changing by the radiation direction of second reflecting surface reflection.
Preferably, the light from the light sources transmit to the receiver has substantially invariable optical length, the relative angle location independent between it and rotor and the stator.In addition, the operation of optic rotary joint preferably has nothing to do with the wavelength of light signal and the data rate of signal.
Reduce light and incide Strength Changes on the receiver to satisfy the dynamic range restriction of receiver.The drift angle of second reflecting surface is about 45 °.
In this preferred embodiment, light signal transmits in a plurality of channels.The maximum transmission data rate of optic rotary joint is the product of channel number sum and each channel maximum data rate.The data rate that each channel can transmit is 5.0Gbit/sec or bigger.In a concrete form of 16 channels was arranged, maximum data rate was about the order of magnitude of 80Gbit/sec.
Second reflecting surface can be a circular conical surface.
Improved optic rotary joint can also comprise: the cross point switches of N input end and M output terminal is arranged and/or a plurality of light sources of different wave length are arranged, wherein light signal is a wavelength-division multiplex signals.
In yet another aspect, the invention provides: optic rotary joint (35), can between rotor and stator, realize optical communication, rotor has the longitudinal axis, comprise: at least one light source (36) of installing above one in rotor and stator is used for along the radial emission light signal with respect to the rotor longitudinal axis; At least one first reverberator (38) of installing above in rotor and stator another, be used to reflect light signal from light emitted, first reverberator comprises: first reflecting surface (44) has been configured to the first focus (F taking from by the line on the plane of described first reflecting surface (L)
1) and the second focus (F
2) the part ellipse, the position of first focus be with rotor the axle overlap substantially; Be arranged to the receiver (48,49) that receives light; With at least one optical waveguide (47), it has the input end that is placed on second focus vicinity and output terminal is arranged, wherein optical waveguide comprises the fiber array that is made of a branch of optical fiber, it have with the contiguous tight adjacent input end of second focus and output terminal is arranged and wherein fiber array be arranged to direct light and arrive receiver.
In this form, input end can be the convex input end.Second focus can be arranged in the inside of convex input end, outside or it above.Input end can be configured to one section right cylinder.The input end of optical fiber can be configured to strip, and has protruding surface.The taper stripe waveguide can be used for direct light to receiver.
Receiver can be the photodiode (49) that the active region is arranged, and light can be directed into the active region from the output terminal of optical fiber.Lens (48) can be placed between output terminal and the photodiode, are used for direct light to photodiode.
In this preferred form, light propagates into receiver from input end optical length is essentially identical for every optical fiber, and the length of optical fiber is essentially identical.
In yet another aspect, the invention provides a kind of optic rotary joint (50), can between rotor and stator, realize optical communication, rotor has the longitudinal axis, comprise: first member (51), it has recessed first reflecting surface (52), has been configured to the first focus (F taking from by the line on the plane of first reflecting surface (L)
1) and the second focus (F
2) the part ellipse, the position of first focus be with rotor the axle overlap substantially; Be installed in second member (53) on the side of first member; Be installed in the 3rd member (56) on the opposite flank of first member; Be installed on second member and the 4th member (54) of second reflecting surface (55) is arranged, it is configured to the taper shape of part, and second reflecting surface has the longitudinal axis, and the position of second focus is substantially on second reflecting surface; With the receiver (58) that is installed on the 3rd member, therefore, look that the light that is derived from first focus and incides on first reflecting surface is reflected to second reflecting surface, and this reflected light that incides on second reflecting surface is reflected to receiver again.
Receiver can be aimed at substantially with the longitudinal axis of second reflecting surface.
First reflecting surface configuration and being arranged to like this, preferably, light incides area first reflecting surface on less than light from light source from the area that first reflecting surface incides on second reflecting surface.For this purpose, first reflecting surface can be configured to the elliptical area of part.
In a concrete form, first member is the tabular component that relative two planes are arranged, and second member has the plane that is arranged to a plane in engagement first member, and the 3rd member has the plane that is arranged to another plane in engagement first member.Second member and the 3rd member can be tabular components.Second reflecting surface can be a circular conical surface, and its drift angle is about 45 °.
Receiver can be aimed at substantially with the longitudinal axis of second reflecting surface.Receiver can comprise: the optical element that is installed on the 3rd member and aims at substantially with the longitudinal axis of second reflecting surface, with the optical fiber that input end and output terminal are arranged, input end is arranged to from receiving optical element and receives light, and the photodiode that is arranged in receiving end.Receiving optical element can comprise: a non-spherical lens and a spherical lens, and a pair of non-spherical lens, or the like.
In yet another aspect, the invention provides a kind of on support the method for installing optical rotary joint, may further comprise the steps: a tool palette (60) that annular inner section (61) and arc foreign section (63) are arranged (a) is provided, a plurality of circular V-type grooves (62) that radially extend are at interval arranged on inner section, and a plurality of circular hoppers (64) are at interval arranged on foreign section, each hopper is suitable for admitting reflector arrangement, and keeps it in the precalculated position with respect to contiguous V-type groove; (b) provide a plurality of optical reflector devices (50); (c) in each hopper, place an optical reflector device; (d) in the V-type groove of described tool palette, provide a plurality of optical collimators that assemble and test described optical fiber and collimator apparatus and adjacent light reflector arrangement between the integrality that is connected of light; (e) provide stator segment; (f) on described reflector arrangement, place described stator segment; (g) stator that reflector arrangement assembles with formation is installed on stator segment; (h) take off the described stator that assembles from tool palette; (i) at least some V-type grooves, place cylindrical fixed cun pin (65); (j) provide a plurality of rotor sections (66), each rotor section has a plurality of circular V-type grooves that radially extend at interval; (k) place rotor section, making surely, a cun pin is in the V-type groove of rotor section; (l) connect the rotor (68) that each rotor section assembles with formation; (m) take off the rotor that assembles from tool palette; (n) rotor that assembles is inverted; (o) provide a plurality of optical fiber and collimator apparatus; (p) described optical fiber and collimator apparatus are installed in the described Rotor V type groove that assembles; (q) provide a plurality of clips; (r) clip is installed on rotor that assembles and stator segment, and is kept collimator apparatus to aim at optical reflector device; (s) rotor and the stator segment that assembles is installed on support; (t) take off clip; Thereby the rotor assemble and stator are being installed on the support with desirable optical alignment between realizing mutually.
So general objects of the present invention provides a kind of improved optic rotary joint.
Another object of the present invention provide a kind of on support the improving one's methods of installing optical rotary joint, in order that between rotor and stator, keep desirable aiming at.
Another purpose provides a kind of improvement optical reflector device that is used for optic rotary joint.
According to above and following explanatory note, accompanying drawing, and appending claims, purpose of these and other and advantage are conspicuous.
Description of drawings
Fig. 1 is the synoptic diagram that comprises the prior art optic rotary joint of reflector arrangement, and this reflector arrangement has ellipsoidal reflector and hyperbolical reverberator, and view shown in Figure 1 in this view and ' 741 patent is basic identical, and different is their reference number.
Fig. 2 is a segmentation sectional view of taking from Fig. 1 cathetus 2-2, and sectional view shown in Figure 2 in this sectional view and ' 741 patent is basic identical, and different is their reference number.
Fig. 3 is the top plan view of the optic rotary joint of prior art shown in Fig. 1 and 2, and this plan view is said and utilized optical fiber as the oval reflecting surface of receiver limited acceptance angle to be arranged.
Fig. 4 is the synoptic diagram that another kind of form prior art comprises the optic rotary joint of ellipsoidal reflector, and it is arranged to a focal point F
1The light of the light emitted at place reflexes to and is placed on focal point F
2Optic fibre input end, this view is identical with view shown in Figure 4 in the patent of ' 741 basically, different is their reference number.
Fig. 5 is the perspective diagram of improved optic rotary joint, its explanation transmitting optical signal is to the transmission optical element of ellipsoidal reflector, these light signals reflex to cone-shaped reflector, and then upwards reflection arrives the optic fibre input end of communicating by letter with photoelectric detector by a series of lens.
Fig. 6 is the perspective diagram that is similar to improvement optic rotary joint shown in Figure 5, and wherein the light signal of being sent back to by oval reflecting surface reflection is focused with long-range the dispersing of sectored light fibre array and holds the arc stripe waveguide of communicating by letter.
Fig. 7 is used for the synoptic diagram that key diagram 5 received signals have the broad acceptance angle.
Fig. 8 is the synoptic diagram that passes through improved optic rotary joint with the rate transmissioning data of 80Gbit/sec.
Fig. 9 is the electronic installation synoptic diagram of exchange light signal on different rotor-positions, can realize bigger message transmission rate on the rotation interface.
Figure 10 utilizes the synoptic diagram of impact damper/multiplexer to realize that channel is selected.
Figure 11 utilizes the synoptic diagram of cross point switches to realize that channel is selected.
Figure 12 is a kind of skeleton view of improvement optical reflector device of form.
Figure 13 is used to assemble the tool palette skeleton view that improves optic rotary joint, and this view specification annular inner section and arc foreign section wherein have five hoppers placing reflector arrangement.
Figure 14 is similar to skeleton view shown in Figure 13, but its explanation optical reflector device has been placed in the hopper of tool palette foreign section.
Figure 15 is similar to skeleton view shown in Figure 14, but fixed cun pin of its explanation has been placed in the V-type groove and stator segment be placed on reflector arrangement above.
Figure 16 is similar to skeleton view shown in Figure 15, but four rotor sections of its explanation have been placed on deciding on cun pin of tool palette inner section, and has been joined together to form the rotor that assembles.
Figure 17 is similar to skeleton view shown in Figure 16, but its illustrates that rotor is squeezed, and utilizes clip to be fixed to stator apparatus.
Figure 18 is the synoptic diagram that utilizes wavelength-division multiplex technique, is used for the multiplex data transmission by improving the bandwidth of optic rotary joint.
Embodiment
At first, it should be clearly know that identical reference number is used for discerning the consistent same structure unit of drawings attached with institute, part or surface, because in whole explanatory note, may further describe or explain these unit, part or surface, these detailed descriptions are component parts of instructions.Unless other explanation is arranged, these accompanying drawings need with instructions read (for example, hacures, the arrangement of parts, ratio, the number of degrees, or the like), and be taken as the part of the whole explanatory note of the present invention.As employed in the following description, term " level ", " vertically ", " left side ", " right side ", " on " and D score and their adjective and adverbial word derivatives are (for example, " along continuous straight runs ", " to the right ", " making progress ", or the like) only be meant the structural approach in reader's the concrete accompanying drawing.Similarly, term " inwardly " and " outwards " generally are meant the prolongation axle of surface with respect to it, or the orientation of turning axle.
In one aspect, the invention provides a kind of improved optic rotary joint, disclosed constant journey oblong reverberator fundamental mode in ' 714 patent that it has, but another and different elements are arranged, that is, second reverberator, it has second reflecting surface that is configured to as the part circular conical surface.Add this second reverberator and can improve optic rotary joint: (1) is with higher efficient emission light signal, (2) impel this optical signal transmission to enter the input end of optical fiber, (3) number of permission minimizing light source and (4) reduce the optical length from the light source to the receiver.
Though under high data rate transfer, utilize photoelectric detector to remain acceptable, under electrical noise environment, need at first to guide the signal that is launched to enter the optic fibre input end of communicating by letter sometimes with remote receiver as reverberator by swivel adapter head.We also need to amplify the acceptance angle of this reception optical fiber, thereby can use fewer purpose light source.The number that reduces light source just can reduce the manufacturing cost of improving optic rotary joint.Therefore, the invention provides relevant optical module, the optic rotary joint of electronic component and manufacture method can be launched the light data and enter the input end of optical fiber by the rotation interface, and it has the acceptance angle of increase, the optical length that reduces, and the coupling efficiency of increase is arranged.
In yet another aspect, the invention provides a kind of improved optic rotary joint, wherein the light that reflects from oval reflecting surface is focused with the distant place of the sectored light fibre array that many optical fiber are arranged and disperses the strip optical waveguide that end is communicated by letter, these optical fiber have the disperse input end of tight adjacent contiguous with second focus, and the output terminal of the direct light of being arranged to arrival receiver is arranged.
In yet another aspect, the invention provides the improvement optical reflector device that is used for this optic rotary joint.
In yet another aspect, the invention provides improved method, can assemble optic rotary joint, and when keeping and keeping this optical alignment, this joint that assembles is installed to support according to the mode of optical alignment.
These different aspects below are discussed seriatim.
Improved optic rotary joint (Fig. 5-6)
Fig. 5 is the conceptual schematic view according to the improved optic rotary joint of the present invention, it be used in the rotation interface on so that optical communication to be provided, for example, between above-mentioned rotor and stator.In Fig. 5, improved optic rotary joint 35 is installed in epitrochanterian light source 36, be installed in first reverberator 38 on the stator, also be installed in second reverberator 39 on the stator, with the optical receiver that comprises a series of lens 40, it communicates with the optical fiber 41 that is directed to long-range photoelectric detector (not shown).In Fig. 5, the position of light source is the far-end at optical fiber 42.The light that draws is outwards to disperse from optical fiber end, and transmission is by collimation lens 43 after this.By after the collimation lens 43, each bar light is dispersed slightly in transmission, and they seem from focal point F 1, and is directed into first reflecting surface 44 of first reverberator 38.Preferably, this first reflecting surface is configured to the elliptical area of part, that is, it has composite curvature on each axle of two orthogonal axes (that is, x-y, and y-z).First curvature is (that is, on the x-y plane) in the horizontal direction, and it is to represent with the dotted line L that passes through, and is configured to that first focal point F is arranged respectively
1With second focal point F
2The part ellipse.Yet first reflecting surface (that is, on the y-z plane) in vertical direction also is crooked.The effect of the composite curvature of first reflecting surface is that the optical convergence that reflects from the zone of first reflecting surface 44 becomes the some shaped laser spot on second reverberator 39.
In this disclosed embodiment, second reflecting surface 45 on second reverberator 39 is conical.Yet second reflecting surface also can be some other parts on frustum of a cone or the circular cone.As mentioned above, because oval reflecting surface has composite curvature, the area that light incides on second reflecting surface incides area on first reflecting surface less than light.In this disclosed embodiment, the drift angle of conical second reflecting surface 45 is about 45 °.Therefore, the light that incides on second reflecting surface 45 is entered a string lens 40 by guiding upwards.These string lens can comprise two plano-convex lenss, two non-spherical lenses, lens and a holographic element, or some other combinations of lens and/or other optical elements.Under any situation, the function of these string lens is input ends that converging light enters optical fiber 41, and optical fiber 41 these light of transmission are to long-range photodiode (not shown).
On the plane of oval first reflecting surface, 44 online L first focal point F is arranged
1With second focal point F
2First focal point F
1The position be with rotor the axle overlap substantially.Second focal point F
2The position be along circular cone 39 the axle on.Therefore, look and be derived from first focal point F
1Light beam incide on the oval reflecting surface 44, and be reflected and converge to conjugate focus F in the circular cone 39
2Second reflecting surface is also along the reflected light that is directed upwardly perpendicular to light incident.
The second reverberator circular cone can be by glass, and plastics or metal are made, and can apply reflectance coating to reflect maximum light quantity.The sub-device of optics is placed on the reflection-type circular cone, is used for focused light and enters receiver.Receiver can be photoelectric detector or optical fiber.Taper shape is effectively, because its from bigger area (that is, collimated light beam incides the area on first reflecting surface) is collected light, and it upwards is directed to receiver.This convergence and the direction that changes can overcome the limited acceptance angle of traditional fiber, and allow to receive optical fiber receiving optical signals on the enlarged-area of oval reflecting surface.In this disclosed embodiment, second reflector arrangement becomes a taper shape, and 45 ° drift angle is arranged, and therefore, light can be reflected along the direction perpendicular to light incident.Though it is preferred, this arrangement is not unmodifiable.Under suitable situation, second reflecting surface can be frusto-conical face and/or can have and be different from 45 ° drift angle.
The light that is used to focus on from circular conical surface can comprise a string lens to the sub-device of the optics of receiver, or the combination of lens and holographic element.In Fig. 5, the light beam that two plano-convex lenss are used to assemble from circular conical surface enters optical fiber.The sub-device of this optics also can be made of lens and volume hologram, is used for diffraction light and enters reception optical fiber.Perhaps, the sub-device of optics can be the array of spherical lenses of arranging around cone axis.If receiver needs along continuous straight runs to install, then can between two lens, right-angle prism be installed, thereby make from the folded light beam of circular cone half-twist again.If need be with certain other angle direct light, then can use catoptron, the prism of some other suitable shapes, or the like.
Fig. 6 is the improvement optic rotary joint of another kind of form.In this form, the light that reflects from oval first reflecting surface 44 is focused, and converges to the arc stripe waveguide that end is communicated by letter of dispersing with the sectored light fibre array.The light that enters these optical fiber is directed, and penetrates by collimation lens 48 arrival photoelectric detectors 49 at its convergent end.
These improved optic rotary joints have many advantages.This device has substantially invariable optical length from the light source to the receiver, the relative position of it and rotor and stator is irrelevant.This constant optical length can make a plurality of light signals superpose in receiver and not have phase distortion.When the laser instrument that needs higher data transfer rate and this higher data rate of support did not have enough big power, several light sources that can superpose were to increase the luminous power that arrives photoelectric detector.
In addition, the wavelength of improved optic rotary joint and signal and message transmission rate are irrelevant.The wavelength that selection is used for this device depends on existing lasing light emitter, the optical fiber of photoelectric detector and transmission light signal.Yet improved optic rotary joint itself is irrelevant with message transmission rate, can utilize the message transmission rate from DC to high Gbit/sec.At last, when the higher data rate of needs, on optic rotary joint, can utilize wavelength-division multiplex technique to launch a plurality of optical channels.
Compare with disclosed device in the patent of ' 714, improvement optic rotary joint disclosed herein also has other advantage.Improved optic rotary joint: (a) reduce to incide the variation that intensity variation causes on the receiver surface, (b) reduce the acceptance angle effect of ellipsoidal reflector, (c) allow before photoelectric detector, to use optical fiber and (d) reduce optical length.
These advantages of explanation in Fig. 7 and Fig. 8.In Fig. 7, shown optical reflector device 46 comprises oval first reflecting surface 44 and conical second reflecting surface 45, as described above.Light signal produces from light source 42.In Fig. 8, these different signal transmitting illuminants are respectively to use TX1, TX2 ... TX18 represents, and different optical reflector devices is respectively to use CH1, CH2 ... CH16 represents that wherein each channel has a reverberator.
In simple ellipsoidal reflector configuration, as disclosed in Fig. 1 of ' 714 patent, light source produces the folded light beam of different incidence angles on receiver with respect to the position of ellipsoidal reflector.With near the center those ellipsoidal reflectors relatively, under near the light beam that incides ellipsoidal reflector its edge can be with bigger incident angle with respect to the receiver normal to a surface, assemble.Because the decline of receiver sensitivity is the function as incident angle (that is, incident beam and this light beam incide the angle between the normal to a surface), there is the light beam of big incident angle to make receiver produce less output signal.
In the present invention, oval first reflecting surface preferably the part elliptical area.Therefore, the recombination property of this elliptical area incides its lip-deep area to light and is focused into a hot spot on conical second reflecting surface, as shown in Figure 5.The light that converges on this hot spot is upwards reflexed to receiver once more.Therefore, the signal of secondary reflection has the incident angle of the receiver of diverse location not have to show very big variation for light source with respect to stator again.So the detected signal of receiver is that the incident angle that incides on oval first reflecting surface 44 with light is irrelevant basically, and, it basically with the location independent of rotor with respect to stator.So, can reduce around the used number of light sources of rotor.Near the sensitivity that reduces the ellipsoidal reflector edge is important, because this helps to improve the minimum signal that photoelectric detector produces.When the light beam of a light source to be ready leaving reverberator and the light beam of an adjacent light source when to be ready entering reverberator, photoelectric detector produces minimum signal.Near increase overlapping reflector edge can increase the amplitude of superimposed light signal and the signal that is produced by detecting device, thereby reduces required number of light sources in improving optic rotary joint.
Another advantage of the present invention is to allow to use receiver optical fiber before.In the patent of ' 714, the optical fiber that used before receiver is the obstruction that is subjected to the limited NA of optical fiber.As described herein, improved compound oval reflecting surface can be focused into hot spot on second reflecting surface to reflected light.The surface of cone-shaped reflector can forward the folded light beam from ellipsoidal reflector to receiver.By using cone-shaped reflector, be substantially invariable in ellipsoidal reflector institute in to whole angular range with respect to the incident angle of receiver surface normal.The folded light beam that additional optical scholar's device on circular cone can be used for focusing on convergence enters the input end that receives optical fiber.On the rotation interface, occur on the zone of serious electrical noise, or when needs remote detection signal, it is useful especially using this optical fiber.Use cone-shaped reflector can enlarge effective acceptance angle of optic rotary joint.As shown in Figure 7, the acceptance angle of optic rotary joint can be increased to about 21.4 °.This bigger acceptance angle has been arranged, and being used for the required minimum number of light sources of continuous transmission signals on the rotation interface is 17 (that is 17 light sources of, 360 °/21.4 °=16.82 ≈).
Using the 3rd advantage of cone-shaped reflector is to reduce optical length.Utilize geometric analysis, the optical length in the configuration shown in Figure 7 is about 120mm, and it is far smaller than optical length that the optical length (that is, being about 248mm) in Fig. 1 and the configuration shown in Figure 4 reduces and can reduces and improve the sensitivity of optic rotary joint to misalignment.
By guaranteeing optical length substantially invariable in the whole angular range that ellipsoidal reflector takies, and guarantee that enough big luminous power is that reflects guided from the circular conical surface enters optical fiber, optic rotary joint of the present invention can support each channel that the data transmission of 5.0Gbit/sec data rate is arranged.A data channel is by an ellipsoidal reflector, and cone-shaped reflector receives the sub-device of optics, receives optical fiber and high speed optoelectronic detecting device and constitutes.Utilize the data channel array and transmit the technology of swap data, can realize very high message transmission rate around the light source of rotor.Provide an example among Fig. 8, wherein on the circumference at rotation interface, arranging 16 data channels.Each data channel can transmit data rate 5.0Gbit/sec optical data.By to 16 data channel summations, utilize structure of the present invention, can easily realize transmitting the optic rotary joint of 80Gbit/sec (that is 16 channel * 5.0Gbit/sec/ channels).
For example, as shown in Figure 8, optical fiber rotary joint comprises 18 light source TX1 to TX18, and they equally spaced are distributed in respectively on the circumference of rotor, and the nominal angle of each light source is 20 ° at interval.As required, light source can be launched identical light signal, or different light signals.In order to launch the data of maximum on the rotation interface, most of light sources transmit different signal flows.Stator in improving optic rotary joint is divided into 16 sectors.A sector comprises a data channel, and sector borders is with radial slanted bar mark shown in Figure 8.Before the light of light source enters waveguide, switch selectively to provide light signal to specific data channel.For example, light source TX1 transmits the light data and gives channel CH1, and the data that light source TX2 transmits are not on the same group given channel CH2, or the like.When two light sources are in a sector time, these two light sources are switched to and transmit identical data-signal.For example, in Fig. 8, light source TX5 transmits identical signal with TX6 and gives channel CH5.Because the constant optical length character at rotation interface is from the light signal stack longways mutually of light source TX5 and TX6, so detecting device receives stronger in-phase signal from these two light sources.Therefore, by increasing the light intensity of two independent in-phase signals that arrive photoelectric detector, the stack of these two signals can improve the quality of the amplitude summation light signal of stack.
Electronic type exchange (Fig. 9-11)
Fig. 9 explanation can utilize the method for improved optic rotary joint with high transfer rate transmission data.In the upstream of optic rotary joint, utilize common Digital Electronic Technique, the 80Gbit/sec signal segmentation is become the signal flow of 16 5.0Gbit/sec.The signal flow of 16 5.0Gbit/sec is routed to the different light source TX1 to TX18 that respectively organize respectively by channel selector, is transferred to 16 receiver RX1 to RX16 respectively on swivel adapter head.If the number of light sources of using then can be set up greater than 16 transmission channels more than 18.After receiving these signals, they are re-constructed into original 80Gbit/sec signal.
The optic rotary joint of this embodiment can comprise angular position encoder, is used to follow the tracks of the position of rotor with respect to stator, so channel selector can correctly exchange various 5Gbit/sec signals and flow to their light sources separately.Therefore, optical fiber rotary joint of the present invention can be easily with very high data rate transport light signal.
Be important to note that the 5.0Gbit/sec signal is not the bandwidth constraints of optic rotary joint.In fact, can utilize any data rate, and when suitable electronic technology is arranged, can realize 10Gbit/sec or higher data rate up to 5.0Gbit/sec.
In another embodiment, transmitter can be accepted the signal of a plurality of lower data speed, and these signals are re-used to realize the higher data rate of about 5Gbit/sec again.On optic rotary joint, can send this data stream, and be re-constructed into the signal of lower data speed.
There are two kinds of methods can make the source signal of 16 channels of channel selector exchange to 18 light sources at peritrochanteric.First method relates to the No.6 at US Patent, and impact damper/multiplexer method of describing in 385,367 discloses this method as a reference at this.Figure 10 represents the synoptic diagram of this method.
According to the method, each signal in 16 signals is fed into independent impact damper 1-18, a channel in this impact damper fan-out input signal to 18 multiplexer (MUX) channel.Utilization has 18 MUX channels of 16 inputs, can be from the chip of each impact damper receiving inputted signal.The data from another input signal stream can be transmitted in the position that the rotor-position scrambler provides laser to be exchanged.
Though this method generally is feasible, when the number of input channel increased, fan-out/buffer chip just increased widely to the number of interconnections between the MUX chip.For example, if M input signal stream arranged and be N in rotor ring number of light sources on every side, Hu Lian number (N then
Interconnects) be N
Interconnccts=2M * N
The increase of number of interconnections can increase the complicacy of printed circuit board (PCB), and spatially separate chip may be owing to the length of transmission line is introduced waveform distortion.A large amount of impact dampers and other IC can be increased in can observed change in propagation delay amount between each paths.When these signals superposeed in photodetector, the variation of propagation delay can cause waveform distortion and make the eye pattern closure of observation.
Utilize point of crossing (in length and breadth) switch of unblock, can realize another kind of channel selecting method, as shown in figure 11.M * N cross point switches has such advantage, and all interconnection are based on cross point switches, and interconnection all is integrated in the chip.Therefore, just do not need outside interconnection.M * N cross point switches can spatially connect in M the input any one be input in N the output any one export, Figure 11 represents its functional schematic.The unblock switch guarantees that all input ends can be connected to output terminal separately, and transmitting with neither one can be by other the obstruction that is connected.The ability of multi-point diffusion can make an input end be connected to a plurality of output terminals simultaneously, and guarantees that each output terminal only is connected to an input end.
Utilize cross point switches that many advantages are arranged.These advantages comprise reducing of circuit board size and core number, thereby reduce power consumption and make the distorted signals minimum.For example, on the channels transmit device circuit board of typical 4 input ends, adopt the method for cross point switches to be better than impact damper/MUX method, the size of circuit board can reduce about 30%, the number of chip can reduce more than 20% and power consumption can reduce more than 40%.Because these switches are integrated in the mould, compare with impact damper/MUX method, cross point switches can reduce distorted signals and instability usually.In fact, the variation of propagation delay and impact damper/MUX method relatively can reduce more than 80% in cross point switches base transmitter.This can make by the rotation interface the higher data transfer rate.Another advantage of cross point switches is the dirigibility that increases the emission data pattern.Because cross point switches is transparent for data rate and agreement, can set up a plurality of transmission channels, wherein each channel is carried out unique agreement under different data rates.
Improved optical reflector device (Figure 12)
Referring now to a kind of improved optical reflector device 50 shown in Figure 12.This improved optical reflector device has three tabular components that overlap, as described below.First or intermediate member 51 have oval reflecting surface 52, as described above.This intermediate member has smooth upper surface and smooth lower surface.
Therefore, the manufacturing and the structure of improvement optical reflector device are simple.Certainly, must on first member, make oval reflecting surface 52 carefully.The second following member can provide supporting to cone-shaped reflector, and the 3rd top member provides suitable supporting for the reception optical element, and this reception optical element is to aim at cone-shaped reflector.The operation of device shown in Figure 12 is with described above basic identical.First focus of oblong surface is to overlap substantially with the axle of rotor.Therefore, look to reflex to a hot spot on the conical reflecting surface 55 from oval reflecting surface 52, and then optical element is laggard goes into optical fiber 59 by receiving by reflection upwards from the light of armature spindle.The operation of device shown in Figure 12 basically as shown in Figure 5.
Improved installation method (Figure 13-17)
Referring now to Figure 13-17, on the other hand, the present invention also provides a kind of method of assembling optic rotary joint and this optic rotary joint of having assembled being installed on support.
This method is from tool palette 60 is provided, and it has annular inner section 61 and arc foreign section 63, a plurality of circular V-type grooves 62 that radially extend is at interval arranged on inner section 61, and a plurality of circular hoppers are at interval arranged on foreign section.Each hopper is suitable for admitting reflector arrangement, as shown in figure 12 50, and keep this reflector arrangement in precalculated position with respect to contiguous V-type groove.Therefore, Figure 13 upper surface of tool palette that just drawn.Machining that must very careful tool palette, and this device preferably has single one-piece construction.
Next step provides a plurality of optical reflector devices, as shown in figure 12 50.
Referring now to Figure 14, next step is the actual optical reflector device 50 of placing in each hopper.Hopper preferably machining forms, and it can only put into optical reflector device according to a kind of mode, and reflector arrangement has suitable orientation with respect to the V-type groove on the tool palette inner section.Continuation provides stator segment 69 again with reference to Figure 15, and it is placed on the top of optical reflector device.Then, optical reflector device is installed to the stator that assembles with formation on the stator segment.Now, take off the stator that assembles from tool palette.
Next step is to place cylindrical fixed cun pin at least some tool palette V-type grooves, as shown in figure 15.Various fixed cun pins are with digital 65 marks.
After this, provide a plurality of rotor sections 66.These rotor sections are placed on the top of the inner section of tool palette.Each rotor section has the V-type groove that radially extends, and it is fit to aim at the V-type groove of tool palette.Therefore, when each rotor section is placed on cylindrical fixed cun pin when going up, they have suitable orientation between mutually.
After this, connect the rotor that each rotor section assembles with formation, shown in the numeral among Figure 16 68.
Then, take off the rotor that assembles, and from the V-type groove of tool palette, take off cun pin surely from tool palette.The rotor that assembles is inverted, and is utilized a plurality of precision machined fixedly clips to be fixed on the stator that assembles.Then, provide a plurality of optical fiber and collimator apparatus, these optical fiber and collimator apparatus are installed in the Rotor V type groove that assembles.
After this, assembling rotor and stator segment also is installed on the support, for example, the worktable of CT scanner.After this, order is taken off fixedly clip, and the rotor and the stator that assemble are installed on the support, and mutually desirable aligning is arranged.
If desired, this method can also comprise additional step: place measuring fiber and collimator apparatus in a groove of tool palette V-type groove shown in Figure 14; With before taking off the rotor that assembles, test the integrality that light path is connected between this optical fiber and collimator apparatus and the near reflection apparatus from tool palette.
Wavelength-division multiplex technique (Figure 18)
Optical fiber rotary joint of the present invention has also been supported the wavelength optical signals transmission, as shown in figure 18.In this embodiment, optical fiber rotary joint comprises two or more laser instruments or other light sources, is used to provide wavelength optical signals.The optic rotary joint of this embodiment also comprises independent equal length optical fiber, and the different wave length light signal that is used to transmit from each laser instrument or other light sources arrives the rotation interface.Perhaps, light source can comprise coupling mechanism, and as shown in figure 18, being used for combination has wavelength optical signals, and therefore, by means of common optical fiber, the light signal that can transmit combination is to the rotation interface.
Have among the embodiment that wavelength optical signals has been combined at this, receiver can be configured to comprise beam splitter, for example, dichroic filter, be used for separately wavelength optical signals, and comprise a plurality of photodiodes or other detecting device, be used to receive independent light signal.In the embodiment of receiver away from the rotation interface, wavelength optical signals was along common spread fiber before collimated, for example, utilized the collimation lens collimation, then, was cut apart according to the wavelength of light signal.
Utilize wavelength-division multiplex technique, under the situation that does not increase modulation of source speed, can increase bandwidth.Because the cost relevant with increasing modulation of source speed is quite high under bigger data rate, comprising two or more sets laser instruments or light source may be more economical to provide the different wave length light signal sometimes.Utilize this technology, can realize can transmitted data rates at the optic rotary joint of the 160Gbit/sec order of magnitude, wherein utilize two wavelength.
Change
The present invention's imagination can be carried out various variations and change.For example, first reflecting surface should be configured to the part ellipse of first focus and second focus.Preferably, this surface configuration becomes the ellipsoid of part, and it has compound curvature along two mutually perpendicular orthogonal axes, and therefore, light incides area on the ellipsoid and is reflected and is converged to a hot spot on the cone-shaped reflector.
As employed herein, second reverberator is conical, and it has 45 ° drift angle.Yet this is not constant.In some cases, second reverberator can conical butt, and more conical other configurations of part maybe can be arranged.Under any situation, it is characterized in that the function of cone-shaped reflector is that reflected light is to receiving optical element again along different directions, this optical element can be a string lens, or the like.Perhaps, the light of reflection can be directly incident on the workplace of photoelectric detector again.
The professional understands easily, can change various structured materials.Can apply and/or polish each reflecting surface to form high reflectivity.
So, we have showed and have described various feature of the present invention and embodiment, and propose and discuss their various changes, in the present invention's spirit scope that does not depart from following claims and limited, the professional understands the various changes and modifications that they are done easily.
Claims (30)
1. an optic rotary joint can be realized optical communication between rotor and stator, and described rotor has the longitudinal axis, comprising:
At least one light source of installing above one in described rotor and stator is used for the radial emission light signal of edge with respect to the described longitudinal axis;
At least one first reverberator of installing above in described rotor and stator another, be used to reflect light signal from described light emitted, described first reverberator comprises: first reflecting surface, take from the part ellipse that is configured to first focus and second focus by the line on the plane of described first reflecting surface, the position of described first focus overlaps with the axle of described rotor substantially;
Be arranged to the receiver that receives light; With
At least one optical waveguide that input end and output terminal are arranged, the position of input end is contiguous in described second focus, and wherein said optical waveguide comprises fiber array, this fiber array comprises a branch of optical fiber, this optical fiber the described second focus vicinity closely adjacent input end is arranged and output terminal is arranged and the operation of wherein said fiber array on be arranged to direct light to described receiver.
2. according to the optic rotary joint of claim 1, wherein said input end has convex.
3. according to the optic rotary joint of claim 2, wherein said second focus is arranged in the inside of described convex.
4. according to the optic rotary joint of claim 2, wherein said second focus is arranged in the outside of described convex.
5. according to the optic rotary joint of claim 2, wherein said second focus is to be positioned on the described convex substantially.
6. according to the optic rotary joint of claim 2, wherein said input end is configured to one section right cylinder.
7. according to the optic rotary joint of claim 1, wherein said receiver be have the photodiode of active region and wherein light be suitable for being directed into described active region from the described output terminal of described optical fiber.
8. according to the optic rotary joint of claim 7, also comprise:
Lens between described output terminal and described photodiode are used for direct light to described photodiode.
9. according to the optic rotary joint of claim 1, the described input end of wherein said optical fiber is configured to strip.
10. according to the optic rotary joint of claim 9, wherein said strip has nonreentrant surface.
11. the optic rotary joint according to claim 9 also comprises:
Be arranged in the conical optical waveguide between described strip and the described receiver in the operation, be used to guide light to arrive described receiver from described strip.
12. according to the optic rotary joint of claim 1, wherein the propagation path of light from described input end to described receiver is identical for every described optical fiber basically.
13. according to the optic rotary joint of claim 12, the length of wherein said optical fiber is identical basically.
14. an optical reflector device is used for realizing optical communication between rotor and stator, described rotor has the longitudinal axis, comprising:
First member that the first recessed reflecting surface is arranged is taken from the part ellipse that is configured to first focus and second focus by the line on the plane of described first reflecting surface, and the position of described first focus overlaps substantially with the axle of described rotor;
Be installed in second member of described first member, one side;
Be installed in the 3rd member of the opposite side of described first member;
Be installed on described second member and the 4th member of second reflecting surface is arranged, it is configured to the taper shape of part, and described second reflecting surface has the longitudinal axis, and the position of described second focus is basically on described second reflecting surface; With
Be installed in the receiver on described the 3rd member, therefore, look and be derived from described first focus and incide that light on described first reflecting surface is reflected to described second reflecting surface and this reflected light of inciding on described second reflecting surface is reflected to described receiver again.
15. according to the optical reflector device of claim 14, wherein said receiver is to aim at substantially with the longitudinal axis of described second reflecting surface.
16. according to the optical reflector device of claim 14, wherein said first reflecting surface configuration and being arranged to like this, light incides area first reflecting surface on less than light from described light source from the area that described first reflecting surface incides on second reflecting surface.
17. according to the optical reflector device of claim 16, wherein said first reflecting surface is configured to the ellipse of part.
18. according to the optical reflector device of claim 14, wherein said first member is the tabular component that two relative plane surfaces are arranged.
19. according to the optical reflector device of claim 18, wherein said second member has plane surface, it is arranged to a surface in the described first member plane surface of engagement.
20. according to the optical reflector device of claim 19, wherein said the 3rd member has plane surface, it is arranged to another surface in the described first member plane surface of engagement.
21. according to the optical reflector device of claim 14, wherein said second member is a tabular component.
22. according to the optical reflector device of claim 14, wherein said the 3rd member is a tabular component.
23. according to the optical reflector device of claim 14, wherein said second reflecting surface is a circular conical surface.
24. according to the optical reflector device of claim 23, the drift angle of wherein said circular conical surface is about 45 °.
25. according to the optical reflector device of claim 14, wherein said receiver is the axis alignment with described second reflecting surface basically.
26. optical reflector device according to claim 25, wherein said receiver comprises: be installed on described the 3rd member and the reception optical element of the axis alignment of basic and described second reflecting surface, with the optical fiber that input end and output terminal are arranged, input end is arranged to from described reception optical element and receives light, and the photodiode that is arranged in described receiving end.
27. according to the optical reflector device of claim 26, wherein said reception optical element comprises: non-spherical lens and spherical lens.
28. according to the optical reflector device of claim 26, wherein said reception optical element comprises: a pair of non-spherical lens.
29. the method for an installing optical rotary joint on support may further comprise the steps:
(a) provide a tool palette that annular inner section and arc foreign section are arranged, a plurality of circular V-type grooves that radially extend are at interval arranged on inner section, and a plurality of circular hoppers are at interval arranged on foreign section, each hopper is suitable for admitting reflector arrangement, and keeps it in the precalculated position with respect to contiguous V-type groove;
(b) provide a plurality of optical reflector devices;
(c) in each hopper, place an optical reflector device;
(d) in the V-type groove of described tool palette, provide a plurality of optical collimators that assemble;
(e) integrality that light is connected between test described optical fiber and collimator apparatus and the adjacent light reflector arrangement;
(f) provide stator segment;
(g) on described optical reflector device, place described stator segment;
(h) stator that optical reflector device assembles with formation is installed on this stator segment;
(i) take off the described stator that assembles from this tool palette;
(j) at least some described V-type grooves, place cylindrical fixed cun pin;
(k) provide a plurality of rotor sections, each rotor section has a plurality of circular V-type grooves that radially extend at interval;
(l) place described rotor section, making described fixed cun pin is in the V-type groove of described rotor section;
(m) connect the rotor that each described rotor section assembles with formation;
(n) take off the rotor that assembles from described tool palette;
(o) the described rotor that assembles is inverted;
(p) provide a plurality of optical fiber and collimator apparatus;
(q) described optical fiber and collimator apparatus are installed in the described Rotor V type groove that assembles;
(r) provide a plurality of clips;
(s) described clip is installed on described rotor that assembles and described stator segment, and is kept described collimator apparatus to aim at described optical reflector device;
(t) described rotor that assembles and stator segment are installed on described support; With
(u) take off described clip;
Thereby described rotor that assembles and stator are being installed on the described support with desirable aligning between realizing mutually.
30. according to the method for installing optical rotary joint on support of claim 29, wherein said support is the worktable of CT scan machine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910209124A CN101813795A (en) | 2006-04-28 | 2006-04-28 | Optical rotary joint, method for installing optical rotary joint in correct alignment manner and optical reflector device used therein |
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| CN200910209124A CN101813795A (en) | 2006-04-28 | 2006-04-28 | Optical rotary joint, method for installing optical rotary joint in correct alignment manner and optical reflector device used therein |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800009349A Division CN101258429B (en) | 2006-04-28 | 2006-04-28 | Optical rotating joint, method for mounting optical rotating joint based on right aligning mode and optical reflector device using thereamong |
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| CN101813795A true CN101813795A (en) | 2010-08-25 |
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| CN200910209124A Pending CN101813795A (en) | 2006-04-28 | 2006-04-28 | Optical rotary joint, method for installing optical rotary joint in correct alignment manner and optical reflector device used therein |
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