Abstract:
An adjustment apparatus comprises a base seat, sliding bracket and supporting stand, in which the lower surface of sliding bracket is contacted with the upper surface of the base seat and capable of being slid thereon. A mounting plate is installed at the upper end of the sliding bracket and a raised pin is projected on the surface of the mounting plate. The raised pin can be engaged with a rotating plate. A lens of an optical engine fixed and mounted on the surface of the rotating plate can be rotated levelly around the raised pin to do an adjustment to revise the rightward and leftward trapezoid deformation of an image projected on a screen. Besides, every kind of deformation can be revised by means of the multi-angles adjustment of a reflection mirror on the supporting stand installed at the front end of the sliding bracket.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to an adjustment apparatus, and more particularly to an adjustment apparatus for revising image deformation projected from an optical engine.  
         [0003]     2. Description of Related Art  
         [0004]     Please refer to  FIG. 1 . An optical engine is installed at the bottom of a housing  1  of a television set based on the rear projection principle of a Rear projection television. An image beam emitted from a lens  91  on the optical engine  90  is projected onto a small reflection mirror  3  and then reflected thereby to project onto a large reflection mirror  4 . Finally, the beam is allowed to project onto a screen  5  disposed at the front end of the housing  1  of the television set to form images thereat. An optical adjustment for a television system need not be processed by a general user, because the optical engine  90  and the screen  5  of the rear projection television are combined into one body and the optical adjustment thereof is already processed when the rear projection television leaves the factory.  
         [0005]     Because an image beam emitted from the lens  91  on the optical engine  90  of the rear projection television must be reflected through the reflection mirrors many times and can then be projected onto the screens  5  to form images thereat, the requirement of the tolerances of the relative positions, sizes and angles of a optical engine, reflection mirrors and a screen is very strict on the occasions of production, manufacturing and assembly of them, otherwise, an image deformation or deviation caused from the accumulation of tolerances might undoubtedly be happened. The adjustment procedure thereof is quite time consuming even if the image adjustment can be handled and revised by a quality control person after the event, this causes the quality control person in a production line to be very much persecuted.  
         [0006]     Therefore, how to quickly revise the upward/downward or leftward/rightward trapezoid deformation or even more serious rhombus deformation of the image caused from the many times of reflections of the beam emitted from the optical engine is the topic of the present invention.  
       SUMMARY OF THE INVENTION  
       [0007]     One object of the present invention is to provide an adjustment apparatus, capable of adjusting a levelly rotating angle for an optical engine mounted thereon so that the leftward or rightward trapezoid deformation of an image projected on a screen can be revised.  
         [0008]     Another object of the present invention is to provide an adjustment apparatus, capable of adjusting an image emitted from an optical engine to move leftward or rightward to allow the image to be projected onto the middle of a screen precisely.  
         [0009]     Still another object of the present invention is to provide an adjustment apparatus, eliminating the influence of the errors of the manufacturing and assembly of a reflection plate on an image deformation together so as to improve the image deformation more effectively by forming an optical engine and an adjustment mechanism of the reflection plate into one body.  
         [0010]     For attaining to the objects mentioned above, an adjustment apparatus according to the present invention comprises a base seat, sliding bracket and supporting stand, in which the lower surface of sliding bracket is contacted with the upper surface of the base seat and capable of being slid thereon. A mounting plate is installed at the upper end of the sliding bracket and a raised pin is projected on the surface of the mounting plate. The raised pin can be engaged with a rotating plate. A lens of an optical engine fixed and mounted on the surface of the rotating plate can be rotated levelly around the raised pin to do an adjustment to revise the rightward and leftward trapezoid deformation of an image projected on a screen after an image beam is emitted from the optical engine and reflected by mirrors between the optical engine and the screen. Besides, the upward/downward or leftward/rightward trapezoid deformation or even more serious rhombus deformation can be revised by means of the multi-angles adjustment of a reflection mirror on the supporting stand installed at the front end of the sliding bracket. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]     The present invention can be more fully understood by reference to the following description and accompanying drawings, in which:  
         [0012]      FIG. 1  is a schematic view, showing a structure of a rear reflection television of the prior art;  
         [0013]      FIG. 2  is an explosive view, showing an adjustment apparatus of a preferred embodiment according to the present invention;  
         [0014]      FIG. 3  is a prospective view, showing an adjustment apparatus of a preferred embodiment according to the present invention;  
         [0015]      FIG. 4  is a schematic view, showing an adjustment state of a rotating plate of an adjustment apparatus of a preferred embodiment according to the present invention;  
         [0016]      FIG. 5  is a prospective view, showing an assembly of an adjustment apparatus and supporting bracket of a preferred embodiment according to the present invention;  
         [0017]      FIG. 6  is an explosive view, showing a supporting bracket and reflecting plate of a preferred embodiment according to the present invention; and  
         [0018]      FIG. 7  is a schematic view, showing an adjustment of a reflecting plate of a preferred embodiment according to the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0019]     Please refer to  FIGS. 2 and 3 . An adjustment apparatus comprises a base seat  10 , sliding bracket  20 , mounting plate  23  and rotating plate  24 , in which the base seat  10  is used for mounting corresponding components of the adjustment apparatus; a plurality of raised pillars  11  and fixing holes  12  are disposed at the surface of the base seat  10 . A sliding plate  22  in which a plurality of parallel long through grooves  221  and long through holes  222  are opened is extended in a level direction at each side of the lower end  21  of the sliding bracket  20 . The raised pillar  11  on the base seat  10  is passed through the long through groove  221  to allow the sliding bracket  20  to be moved linearly relative to the base seat  10 , the longitudinal directions of both of the long through grooves  221  and the long through holes  222  are respectively parallel to an image picture (not shown in the figure) and the long through hole  222  is disposed correspondingly to the fixing hole  12  in the base seat  10 ; a fixing element  40  is passed through each long through hole  222  and locked in the fixing hole  12  in the base seat  10  so as to fix the sliding bracket  20  on the base seat  10 . Besides, an adjusting seat  15  is installed on the surface of the base seat  10  and a notch  121  is disposed in the adjusting seat  15  for accepting an adjusting element  16 ; the adjusting element  16  can be a screw bolt. A screw end  161  of the adjusting element  16  is screwed to a screw hole (not shown in the figure) at a flank side of the sliding bracket  20 , and a adjusting end  162  at another end thereof is engaged in the notch  151  in the adjusting seat  15 . The mounting plate  23  is installed on the sliding bracket and a raised pin  231  is disposed on the center of one end of the mounting plate  23 . A rotating plate  24  on which the optical engine is mounted is engaged on the raised pin  231 . A plurality of circular arc grooves  241  are opened in the rotating plate  24  for one end of a second fixing element  45  to be passed through each circular arc groove  241  and fixed on the mounting plate  23 .  
         [0020]     When an image emitted from the optical engine is projected on a rightward or leftward deviated location of a screen, the first fixing element is first loosened, and a tool is then used to adjust the adjusting element  16  in the notch  151  of the adjusting seat  15 . In the meantime, the adjusting end  162  of the adjusting element  16  is rotated in the notch  151  of the adjusting seat  15  by the guidance of the raised pillar  11  and the long through groove  221 , and the sliding bracket  20  is driven by another screw end  161  to move in the longitudinal direction along the long through groove  221  and the long through hole  222  so that the leftward or the rightward deviated image on the screen can be revised and moved to the center of the screen gradually. Finally, the first fixing element  40  is rotated tightly to fix the sliding bracket  20  onto the base seat  10  after the adjustment is completed.  
         [0021]     Please refer to  FIG. 4 . When an image projected on a screen through the optical engine  90  is leftward or rightward deformed, the second fixing element  45  is first loosened, and the rotating plate  24  is then rotated around the raised pin  231  so as to cause the level angle of the optical engine  90  fixed on the rotating plate  24  to be changed through the rotation of the rotating plate  24  to revise the leftward or rightward trapezoid deformation of the image. Finally, the second fixing element  45  is rotated tightly after the adjustment completed and the rotating plate  24  can then be allowed to fix on the mounting plate  23 .  
         [0022]     Please refer to  FIG. 5 . For promoting the adjustment function of the adjustment apparatus according to the present invention. The adjustment apparatus further comprises a supporting stand  30  on which an angle adjustable reflecting plate  31  is installed. Hooking pins  211  and hooked notches  302  are respectively at two sides of the front ends of the supporting stand  30  and sliding bracket  20  for allowing the supporting stand  30  to be fixed at the front end of the sliding bracket  20 . Please refer to  FIG. 6 . The reflecting plate is inlayed in the supporting stand  30  and can also be a high albedo reflection mirror. A positioning hole  311  is disposed at the center of reverse side of the reflecting plate  31  and a fixing hole  301  is disposed at the surface at the upper end of the supporting stand  30 . a bolt  32  cover with an elastic washer  33  is passed through the fixing hole  301  of the supporting stand  30  and screwed and fixed in the positioning hole  311  to allow the reflecting plate  31  to be fixed on the upper end of the supporting end  30  and the elastic washer  311  engaged with the bolt  32  is exactly inside the inner wall surface of the fixing hole  301 . Furthermore, a plurality of long grooves  312  are disposed around the circumference of the positioning hole  311  of the reflecting plate  31  and a plurality of the adjusting rods  34  are screwed around the circumference of the fixing hole  301  of the supporting stand  30 ; a front end  341  of each adjusting rod  34  can just be correspondingly pressed against the inside of the long groove  312  of the reflecting plate  31  so that the reflecting plate  31  can be allowed to fix on the upper end of the supporting plate  30  with a fixed angle. And, a plurality of elastic elements are installed between the reflecting plate  31  and the supporting stand  30 ; the elastic element can be a spring  50 . When the adjustment of any adjusting rod  34  pressed against the inside of the long groove  312  of the reflecting plate  31  is processed, the reflecting plate  31  can be controlled to deviate to an angle by means of the elastic tension of the spring  50  itself.  
         [0023]     Please refer to  FIG. 7 . When an image projected from the optical engine  90  to a screen forms a upward/downward or leftward/rightward trapezoid deformation or even a rhombus deformation, the reflecting plate  31  on the supporting stand  30  must be adjusted to cause the angle of the image light reflected thereby to be relatively changed and then to attain to the revision of the upward/downward or leftward/rightward deformation or rhombus deformation of the image. Because the reflecting plate  31  is fixed by the bolt  32  surrounded with a elastic washer  33  and the elastic washer  33  is engaged in the inner wall of the fixing hole  301 , the bolt  32  can be swung in the fixing hole  301 , front ends of the three adjusting rods screwed at the upper of the rear side of the supporting stand  30  are respectively pressed against the inside of the long grooves  312 . The reflecting plate  32  can be allowed to take the bolt  32  as a center to change the angle of the reflecting plate  31 . For example, when the image projected from the optical engine  90  onto a screen is formed a upward/downward deformation, one of the adjusting rods  34  can be adjusted to extend or retreat by rotating it. Because the spring  50  is positioned between the reflecting plate  31  and the upper end of the supporting stand  30  when one of the adjusting rods  34  is rotated to retreat, the reflecting plate  31  is allowed to take the fixing hole  301  of the adjusting rod  32  as a fulcrum to be swung downward by the elastic force of the corresponding spring  50  itself to cause the front end of the retreated adjusting rod  34  can be kept pressing against the inside of the long groove  312  at the rear side of the reflecting plate  31  to cause the angle of depression of the reflecting plate  31  to changed. On the contrary, when the adjusting rod  34  is rotated to extend, the reflecting plate is pushed by the front end of the adjusting rod  34  to take the fixing hole  301  as a fulcrum to be swung upward and to cause the corresponding spring  50  to be contracted to cause the angle of elevation of the reflecting plate  31  to be changed so that the upward or downward deformation of the image can be revised. Similarly, when the image is formed to be leftward/rightward deformation or more serious rhombus deformation, it can be adjusted by extending or retreating all three adjusting rods  34 .  
         [0024]     Because the adjustment mechanism of the reflecting plate  31  is further added to collocate with the adjustment mechanism of the optical engine in the adjustment apparatus according to the present invention to improve the image deformation so that the adjustment mechanism of the optical engine  90  itself can be simplified. Besides, the influence of the errors of manufacturing and assembly of the reflecting plate  31  on the image deformation can also be eliminated by forming the adjustment mechanisms of the optical engine and the reflecting plate into one body.  
         [0025]     Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.