Abstract:
A lighting subsystem is disclosed that uses optical devices to alter, the actual or apparent optical position of the ends of optical fibers coupled to a high intensity light source so as to provide all of the forward illumination needs for a vehicle. In one embodiment, optical wedges are interposed between a rectangular array of optical fibers and an array of lens elements mountable on the front of a vehicle from which the forward illumination is transmitted therefrom. The imposition of the optical devices alters the actual or apparent optical position of the fibers relative to the lenses and thereby changes the forward illumination from its low to its high beam pattern, to a fog beam illumination or to a cornering illumination pattern. In another embodiment, flat shaped optical members are rotated to provide the various forward illumination needs of the vehicle.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a lighting system having a moveable optical member arranged between lens elements mounted across a vehicle and optical fibers emitting light from one of their ends which is generated by a high brightness light source, wherein the movement of the optical member alters the apparent optical position of the fibers relative to the lens elements in such a manner so as to provide all of the forward illumination needs of the vehicle. 
     U.S. patent application Ser. No. 123,844 filed Nov. 23, 1987 assigned to the same assignee as the present invention, now U.S. Pat. No. 4,811,172 herein by reference, discloses a lighting system that utilizes a high brightness light source which is coupled to fiber optics. In one embodiment, the lighting system includes two high intensity light sources which are respectively coupled to a first and a second plurality of optical fibers. Both pluralities of optical fibers are positioned relative to lens members mounted across a vehicle. The first high intensity light source provides the low beam forward illumination of the vehicle and the light from the second high intensity light source provides the high beam forward illumination of the vehicle. Although the lighting system disclosed in Ser. No. 123,844, now U.S. Pat. No. 4,811,172, serves well the needs of the vehicle, it is desired that a lighting system be provided that needs only one high intensity light source while still providing both the low beam and high beam forward illumination needs of the vehicle. 
     Accordingly, it is an object of the present invention to provide a lighting system that utilizes only one high intensity light source while still providing high and low beam forward illumination for a vehicle. 
     It is a further object of the present invention to have the one high intensity light source also provide the forward directional illumination associated with the cornering lights and fog beam illumination of the vehicles. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a lighting system having an optical member which is moveable in such a manner so as to provide all of the forward illumination needs for a vehicle that is generated by a single high intensity light source. 
     The lighting system comprises the high intensity light source capable of being selectively energized, a plurality of optical carrying devices, a plurality of lens elements positioned relative to the ends of the respective optical carrying devices, and a moveable optical device interposed between the ends of the optical carrying devices and lens elements. The optical carrying devices each have one end predeterminately coupled to the light source with the other end emitting light when the high intensity light source is energized. The moveable device is preferably of a transparent material of a predetermined thickness and having a predetermined index of refraction with its imposition altering the apparent optical position of the optical carrying devices relative to the lens elements. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a schematic illustration of one embodiment of the present invention related to a lighting system that provides the forward illumination including cornering illumination of a vehicle. 
     FIG. 2 illustrates an arrangement of an illumination device related to the present invention. 
     FIG. 3 is a top-view which illustrates an arrangement of the connectors housing optical fibers, a moveable optical member, and lens elements all related to the present invention. 
     FIG. 4 primarily illustrates the interrelationship between a wedge member and the real and apparent position of the ends of the optical fibers relative to lens elements which are involved in generating the low and high beam illumination related to the present invention. 
     FIG. 5 illustrates the effect of the alteration of the apparent position of the optical fibers (object) related to the high and low beam (images) developed by the present invention. 
     FIG. 6 illustrates the interrelationship between a rotating flat optical member altering the apparent optical position of the ends of the optical fibers involved in generating the low and high beam illumination related to the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to the drawing, FIG. 1 illustrates a lighting system 10 of the present invention that is particularly suited to provide the forward illumination including the cornering and fog beam illumination needs for aerodynamically styled vehicles. 
     The lighting system 10 has a high intensity light source 12 that provides all of the lumens to serve the forward, rearward, and interior illumination needs for a vehicle. The present invention is primarily related to providing the forward illumination of the vehicles and therefore the facilities of the light source 12 related to such illumination is only to be described. The light source 12 may be of the type described in U.S. patent application Ser. No. 266,129 pending, filed Nov. 2, 1988, assigned to the same assignee of the present invention, and herein incorporated by reference. 
     The low and high beam forward illumination along with the cornering and fog beam illumination of the vehicle is provided by illumination devices 14A and 14B that are respectively coupled to light source 12 by means of optical carrying devices 16A and 16B. The illuminating devices 14A and 14B, each have a connector 18 that routes electric power to an electrically activated device 20 to be described with regard to FIG. 2. The optical carrying devices 16A and 16B may have various embodiments which are described in previously mentioned Application Ser. No. 266,129. 
     The illumination devices 14A and 14B each have an arrangement that is shown in more detail in FIG. 2 for illuminating device 14A. FIG. 2 shows an arrangement of the elements tabulated in Table 1. 
     
                       TABLE 1______________________________________OpticalCarrying  Rectangular  Moveable   LensConnectors     Array        Member     Elements______________________________________22.sub.1  24.sub.1     26.sub.11                          26.sub.12                               28.sub.122.sub.2  24.sub.1     26.sub.11                          26.sub.12                               28.sub.222.sub.3  24.sub.1     26.sub.11                          26.sub.12                               28.sub.322.sub.4  24.sub.2     26.sub.21                          26.sub.22                               28.sub.422.sub.5  24.sub.2     26.sub.21                          26.sub.22                               28.sub.522.sub.6  24.sub.2     26.sub.21                          26.sub.22                               28.sub.622.sub.7  24.sub.3     26.sub.31                          26.sub.32                               28.sub.722.sub.8  24.sub.3     26.sub.31                          26.sub.32                               28.sub.822.sub.9  24.sub.3     26.sub.31                          26.sub.32                               28.sub.922.sub.10 24.sub.3     26.sub.31                          26.sub.32                               28.sub.10______________________________________ 
    
     FIG. 2 partially illustrates the illumination device 14A as comprising an arrangement of connectors 22, an optical member 26 and lens elements 28. The connector arrangement 22 is comprised of a plurality of connectors 22 1 , 22 2  . . . 22 n  which lodges the fiber optical cables branched off from the optical carrying device 16A. The ends of the fiber optics of the connectors 22 1  . . . 22 n  emit light through respective apertures 24 1  . . . 24 2  or 24 3  given in Table 1. FIG. 2 further partially illustrates illumination device 14A as comprising an optical member 26 having a plurality of sections 26 11 , 26 12  . . . 26 nn  some of which are tabulated in Table 1, and a plurality of lens elements 28 1 , 28 2  . . . 28 n , some of which are also tabulated in Table 1. The optical member 26 may have three embodiments 26 A , 26 B  (shown in phantom), and 26 C  (shown in phantom) that may be respectively related to the low/high beam illumination, concerning illumination and fog beam illumination each of a vehicle. For such embodiments, the light emitted from the connectors may be shared by the three arrangement by means of appropriate upward, downward, or sideward movement of device 20 or separate connectors (not shown) may be provided for each such arrangement. 
     For the embodiment shown in FIG. 2, the three apertures, 24 1 , 24 2 , and 24 3  are of increasing relative dimensions. Such an arrangement of apertures provides a tapered array of which the maximum light of illumination device 14A is transmitted from optical devices of 22 1 , 22 2 , 22 3 , with a lesser amount from optical devices of 22 4 , 22 5 , 22 6 , and then with an even lesser amount from devices of 22 7 , 22 8 , 22 9  and 22 10 . The lens elements 28 1  . . . 28 n  that cooperate with the optical fibers of 22 1  . . . 22 n  may be of the type described in U.S. patent application Ser. No. 266,129. 
     The principles of the present invention are particularly related to the optical member 26 that is connected to the device 20 which may be actuated and moveably position the associated section 26 11  . . . 26 nn  of members 26 A , 26 B  and 26 C . The device 20, having applied to it the electric power of connector 18, may cause the sections 26 11  . . . 26 nn  to be moved in a sideward, upward or downward manner so that, for example, sections 26 11 , 26 21  and 26 31  are first interposed between the connectors 22 and the lens elements 28, and then sections 26 12 , 26 22  and 26 23  are so interposed. The related sections 26 11 , 26 21  and 26 31  of 26 A  of FIG. 2 have a clear opening to allow light to pass therethrough unimpeded, whereas, related sections 26 12 , 26 22  and 26 32  are of a transparent medium, such as glass or plastic devoid of any opening. The imposition of the moveable device 26 A , in particular 26 12 , 26 22  and 26 32 , alter the apparent or optical position of the related optical devices of connectors 22 relative to the lens elements 28 which alteration may be first described with reference to FIG. 3. 
     FIG. 3 is a top-view which illustrates two light beam patterns 24 A  that are transmitted from the rectangle aperture 24 1  of optical connectors 22 2  and 22 3  The beam patterns 24 A  each pass through the opened portion of flat section 26 11  of optical member 26 A  and impinge upon respective lens elements 28 2  and 28 3 . The flat section 26 11  of 26 A  is interposed between the optical fibers of connector 22 and lens element 28 and is related to the generation of the low beam pattern of the forward illumination of the vehicle. The interaction of the other related section of member 26 such as 26 12  having a wedge shape may be described with reference to FIG. 4. 
     FIG. 4 illustrates a portion of the optical wedge member 26 12  that is interposed between the light rays related to beam pattern 24 A  and the lens element 28 2 . The wedge member 26 12  has a predetermined wedge angle shown in FIG. 4, for example, as 5°. The amount of deviation between the incident light rays striking the wedge member 26 2  and those rays which are refracted before emerging from wedge member 26 2  is a function of the wedge angle, the thickness, and the index of refraction, all of wedge member 26 2 . The wedge angle, thickness, and index of refraction of the wedge number 26 12  may have respective ranges of about 3 to 30 35 degrees; 1 to 10 mm; and 1.3 to 1.8. 
     The practice of the present invention may first be described with reference to the operation of FIG. 4 devoid of a wedge member 26 12 , that is, the operation of light emitted from the aperture 24 1  and passing directly through the open portion of related member 26 11 . For such an operation, a point source of light rays is illustrated at its real position Q as it is seen from or presented to lens element 28 2 . The point source Q is meant to represent the concentration of light emitted from central region of the aperture 24 1 . The point source Q generates a cone of light having an upper path 32 A  (solid line), middle path 34 A  (solid line), and lower path 36 A  (solid line). The imposition of the wedge member 26 12 , by the activation of device 20 of FIG. 2, causes the position of the point source of FIG. 4 as it is seen or as presented to the lens 28 2 , to move from point Q(real) in an inward and upward manner to point Q&#39;. The imposition of the wedge member 26 12  causes the light rays to be refracted inward and downward by wedge member 26 12  as represented by upper path 32 B  (phantom), middle path 34 B  (phantom) and lower path 36 C  (phantom) which further continue on respectively as 32 C , 34 C  and 36 C . The path of the light rays 32 C , and 34 C , and 36 C  are representative of the low beam illumination pattern of a vehicle, whereas, the path of light rays 32 A , 34 A  and 36 A  are representative of the high beam illumination. The Q&#39; point of the emitting light rays related to the low beam pattern, is constructed by extending lines 32 D , 34 D  and 36 D , from their respective locations 32 E , 34 E  and 36 E  from which they emerge from wedge member 26 12  back toward and intersecting at Q&#39;. The point Q&#39; forms the apparent position of the light rays related to the moveable wedge member 26 12  of FIG. 4. The inward movement (Q to Q&#39;) is represented in FIG. 4 by a distance 38 in the range of about 1 mm to about 3 mm, whereas, the upward movement (Q to Q&#39;) is represented by a distance 40 in the range of about 2 mm to about 10 mm. The overall effect of the imposition of wedge member 26 12  is to cause a slight shift in the focus of the lens. By choosing the distances properly, the low beam may be spread slightly and the high beam may be focussed more sharply. 
     The effect of the imposition of the optical wedge 26 12  as it relates to the low and high beam patterns may be further described with reference to FIG. 5. FIG. 5 illustrates the optical effect related to forward illumination of a vehicle on the position of the image (high beam 42 or low beam 44) on changing the real position (Q) or apparent position (Q&#39;) of the object (central region of light emitted from aperture 24 1 ). FIG. 5 is only representative of the light rays related to lens elements 28 2 , whereas, in actuality the light rays related to all of the lens elements 28 1  . . . 28 n , each generating a rectangular image, are superpositioned onto each other so as to form the composite low or high beam illumination pattern of the vehicle. 
     FIG. 5 illustrates the effect of the imposition of the wedge member 26 12  at a location 44 in front of lens element 28 2 . The light rays being emitted from position Q are transmitted by lens element 28 2  so as to form part of the high beam pattern 42, whereas, the light rays being emitted from position Q&#39; are transmitted by lens element 28 2  so as to form part of the low beam pattern 44. The paths related to the light rays of positions Q and Q&#39; are as previously described with regard to FIG. 4. 
     The operation of FIGS. 2, 3, 4 and 5 related to the sections 26 11 , 26 21  and 26 31  having an opened portion to allow the light to be emitted from the ends of the optic fibers of connectors 22 1  . . . 22 N  is also applicable to such sections having a flat transparent portion for intercepting such emitted light with the exception being that the intercepted light rays are refracted downward and the apparent point source Q&#39; is moved inward in a substantially horizontal manner relative to the real point source Q. The amount that the point source is altered from Q to Q&#39; is a function of the thickness and index of refraction of the flat transparent sections 26 11 , 26 21  and 26 31 . 
     The principles of the present invention that have been described for a wedge member 26 12  are also applicable to a flat optical member which is rotated and may be described with reference to FIG. 6. FIG. 6 illustrates the imposition of a flat optical member 26 11  (shown in phantom) between the connection region 24 1  and the lens member 28 2  (not shown) in a similar manner as previously described for wedge member 26 2  of FIG. 4. The flat member 26 11  is shown as positioned in a vertical manner (A) perpendicular to the optical axis 46 of lens 28 2  (not shown) and causes the position of the light source of be alterated from Q (not shown) to Q&#39;. The flat member 26 11  is also shown (B) as rotated by an angle 0 relative to the center of rotation 48 of member 26 11  positioned along the optical axis 46 of lens element 28 2 . The rotation of the member 26 11  may be accomplished with an activation device similar to device 20 except that member 26 11  is moved in a rotating manner rather than the linear movement of the wedge member 26 12  previously described for device 20. 
     The light rays related to the point source Q&#39; striking member 26 11 (B) have an upper path 46 A  (solid line) a middle path 48 A  (solid line) and a lower path 50 A  (solid line). The incident rays 46 A , 48 A  and 50 A  encountering the rotated member 26 11 (B) are refracted, respectively shown as rays 46 B , 48 B  and 50 B  (all in phantom) and emerge therefrom as rays 46 C , 48 C  and 50 C  (also all in phantom) respectively. The Q&#34; point for the emitting light rays related to the rotated member 26 11  (B) is constructed by drawing lines 46 D , 48 D  and 50 D  back from locations 46 E , 48 E  and 50 E , respectively, from which light these rays emerge therefrom and intersecting thereat their origin (Q&#34;). 
     The rotation of the flat member 26 1  causes the apparent or optical position of the light rays emitted from the central region of aperture 24 1  as presented to lens member 26 2 , to move Q&#39; to Q&#34;. The overall effect of the imposition and rotation of optical member 26 11  (B), is that the light rays emitted by the optical fibers at the central region of the aperture 24 1  are directed inward so that the light pattern transmitted by lens 28 2  may be altered from the low beam illumination to the high beam illumination of the vehicle. The illumination patterns generated by the operation of FIG. 6 are similar to the patterns of FIG. 5 previously discussed with regard to FIG. 4. 
     The practice of the present invention, hereinbefore described, for generating the low and high beam forward illumination is equally applicable for generating the forward illumination desired for the cornering lamps. For such cornering lamps, the high beam illumination described with regard to FIGS. 3, 4, 5 and 6 may be used as the direct light desired while the vehicle is proceeding in a direct manner, whereas, the low beam illumination described with regard to FIGS. 3, 4, 5 and 6 may be used as the spread light desired while the vehicle is proceeding through a curve or in a turning manner. The activation of a device related to the cornering lumination may be similar to device 20 associated with the wedge member 26 12 . The activation of such a device may be accomplished by motion sensing means that anticipates the turning of a vehicle so that the cornering lamps may then generate the spread beam illumination pattern. 
     The cornering illumination may be developed by choosing the appropriate parameters and cooperation of device 20, optical member 26 B  and lens elements 28 1  . . . 28 N  all generally illustrated in FIG. 2. For example, the lens elements 28 located in the frontal area near each side portion of the vehicle may be selected to transmit the cornering illumination, and connectors 22 proximate to the selected lens elements may be selected to supply the related generated light, whereas, the associated sections of optical member 26B, similar to 26 11  and 26 12  previously described, may have appropriate parameters selected to develop the desired cornering illumination. For such illumination, the operation of device 20 is selected so that optical member 26 B  is the moved in and out of imposition with its related connectors 22 upon the appropriate occurrence of operator commands. 
     The practice of the present invention may also develop fog beam illumination by choosing the appropriate parameters and cooperation of device 20, optical member 26 C  and lens elements 28 1  . . . 28 N  all generally illustrated in FIG. 2. For example, the lens elements 28 located in the central frontal area of the vehicle may be selected to transmitted the fog beam illumination, and connectors 22 proximate to the selected central lens elements may be selected to supply the related generated light, whereas, the associated sections of optical member 26 C , similar to 26 11  and 26 12  previously discussed, may have appropriate parameters, such as the color yellow, selected to develop the desired fog beam illumination. For such illumination, the operation of device 20 is selected so that optical member 26 C  is moved in and out of imposition with its related connectors 22 upon the appropriate occurrence of operator commands. 
     It should now be appreciated that the practice of the present invention having various flat and wedge optical imposition embodiments provide for a single high intensity light source that generates the light energy for the fog light illumination, and the forward illumination including low and high beams along with cornering illumination. 
     It should be further appreciated that the optical member 26 11  or 26 12  may be interposed between the connectors 22 1  . . . 22 n  of the optical fibers having ends for emitting light and the lens elements 28 1  . . . 28 n  in a linear manner or the optical member 26 11  may be so interposed in a rotated manner. The amount of derivation between the real and apparent positions of the light emitting optical fibers of connectors 22 1  . . . 22 n  , relative to the lens elements 28 1  . . . 28 n  transmitting the low and high beam illumination patterns, is a function of the parameters selected for the optical members 26 11  . . . 26 nn .