Abstract:
A holding apparatus ( 40 ) for spectrum measurement of optical elements includes a fixed board ( 11 ) having a first through hole ( 111 ), and a receiving board ( 12 ) having a plurality of receiving holes ( 120 ) with different sizes configured for holding different optical elements. The receiving board is coupled to the fixed board and rotatable relative to the fixed board about a first axis. The receiving holes are centered on a first imaginary circle which is centered on the first axis. A distance between a center of the first through hole and the axis is equal to a radius of the first imaginary circle.

Description:
BACKGROUND 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to spectrometers and spectrum analysis, and particularly, to a holding apparatus for holding and positioning samples for spectrum analysis. 
         [0003]    2. Description of Related Art 
         [0004]    Spectrometers are used in analyzing optical performance of optical elements, such as filters and film coated lenses. In spectrum analysis, a light beam is passed through an optical element, and the spectrum of the light beam transmitted through the optical element indicates the optical performance of the optical element. 
         [0005]    Generally, a holding apparatus utilized for spectrum analysis can only hold one optical element. 
         [0006]    Therefore, what is needed is a holding apparatus which can hold as many optical elements as possible to increase efficiency of spectrum measurement. 
       SUMMARY 
       [0007]    A holding apparatus for spectrum measurement of optical elements includes a fixed board having a first through hole, and a receiving board having a plurality of receiving holes with different sizes configured for holding different optical elements. The receiving board is coupled to the fixed board and rotatable relative to the fixed board about a first axis. The receiving holes are centered on a first imaginary circle which is centered on the first axis. A distance between a center of the first through hole and the axis is equal to a radius of the first imaginary circle. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    Many aspects of the present holding apparatus can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present holding apparatus. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0009]      FIG. 1  is an exploded isometric view of a holding apparatus for spectrum measurement in accordance with a first embodiment of the present invention. 
           [0010]      FIG. 2  is an exploded isometric view of a holding apparatus for spectrum measurement in accordance with a second embodiment of the present invention. 
           [0011]      FIG. 3  is a schematic, isometric view of the holding apparatus in  FIG. 2 . 
           [0012]      FIG. 4  is a cross-sectional view taken along line IV-IV of  FIG. 3 . 
           [0013]      FIG. 5  is the cross-sectional view taken along line IV-IV of  FIG. 3 , showing an optical element held in the holding apparatus. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0014]    Reference will now be made to the drawings to describe in detail of the preferred embodiments of the present holding apparatus for spectrum measurement. 
         [0015]    Referring to  FIG. 1 , a holding apparatus  40  for spectrum measurement, according to a first present embodiment, includes a fixed board  11 , a receiving board  12 , and a first guide pin  14 . 
         [0016]    In the present embodiment, the fixed board  11  is substantially square shaped. A first through hole  111  is defined at the center of the fixed board  11 . A first pinhole  114  is defined at the periphery portion of the fixed board  11 . 
         [0017]    The receiving board  12  is substantially circular shaped. A plurality of receiving holes  120  configured for accommodating optical elements is defined at the periphery portion of the receiving board  12 . Size of each of the receiving holes  120  is different from each other. Each of the receiving holes  120  includes a first cylindrical receiving portion  121  and a second cylindrical receiving portion  122 . The second cylindrical receiving portion  122  is in communication with the first cylindrical receiving portion  121 . In the present embodiment, the second cylindrical receiving portion  122  is coaxial to the first cylindrical receiving portion  121 . The diameter of the second cylindrical receiving portion  122  is smaller than that of the first cylindrical receiving portion  121 . A first toothed hole  123  is defined at the center of the receiving board  12 . The distance between the center of each of the receiving holes  120  and the center of the receiving board  12  is equal to the distance between the center of the first pinhole  114  and the center of the fixed board  11 . 
         [0018]    The first guide pin  14  includes a toothed end  140  which can be matingly meshed with the first toothed hole  123 . The fixed board  11  and the receiving board  12  are joined together by inserting the first guide pin  14  into the first pinhole  114  and the first toothed hole  123  in succession and meshing the toothed end  140  with the first toothed hole  123 . The receiving space  121  is closer to the fixed board  11  than the second cylindrical receiving portion  122 . 
         [0019]    In operation, the optical elements are received in the cylinder receiving spaces  121 . The position of the receiving board  12  can be adjusted by turning the first guide pin  14 . The toothed end  140  transmits rotational force of the first guide pin  14  to the receiving board  12  by engaging in the first toothed hole  123 . Due to the rotation of the receiving board  12 , the first through hole  111  on the fixed board  11  can be selectively aligned with one of the receiving holes  120  on the receiving board  12 . 
         [0020]    Referring to  FIGS. 2 to 4 , a holding apparatus  10 , according to a second present embodiment, includes a fixed board  11   a,  a receiving board  12 , a light-blocking board  13 , a first guide pin  14 , and a second guide pin  15 . The structure of the fixed board  11   a  is similar with that of the fixed board  11  in the first embodiment, the difference is that a second pinhole  115  is defined on the periphery portion of the fixed board  11   a.  In the present embodiment, the first through hole  111  is at the center of the fixed board  11   a  between the first pinhole  114  and the second pinhole  115 . 
         [0021]    The light-blocking board  13  is configured for limiting the amount of light passing through the optical elements held in the apparatus  20 . Referring to  FIG. 2 , a plurality of second through holes  131  corresponding to the plurality of the receiving holes  120  is defined at the periphery portion of the light-blocking board  13 . The diameter of each of the second through holes  131  is smaller than that of the corresponding receiving hole  120  (refer to  FIGS. 3 and 4 ). The diameter of each of the second through holes  131  is also smaller than that of the first through hole  111 . The distance between the center of each of the second through holes  131  and the center of the light-blocking board  13  is equal to the distance between the center of the second pinhole  115  and the center of the first through hole  111 . A second toothed hole  132  is defined at the center of the light-blocking board  13 . 
         [0022]    The second guide pin  15  includes a toothed end  150  configured for matingly meshed with the second toothed hole  132 . 
         [0023]    The difference between the holding apparatus  40  of the first embodiment and the holding apparatus  10  of the second embodiment is that the light-blocking board  13  is set between the fixed board  11   a  and the receiving board  12 . The fixed board  11   a  and the light-blocking board  13  are joined together by inserting the second guide pin  15  into the second pinhole  115  and the second toothed hole  132  in succession and meshing the toothed end  150  with the second toothed hole  132 . 
         [0024]    In operation, the optical elements are received in the cylinder receiving spaces  121 . The position of the light blocking board  13 , and the receiving board  12  can be adjusted by turning the first guide pin  14  and the second guide pin  15 . Due to the rotation of the receiving board  12  and the light-blocking board  13 , the first through hole  111  on the fixed board  11   a  can be selectively aligned with one of the receiving holes  120  and the corresponding second through hole  131 . 
         [0025]    Referring to  FIG. 5 , before start of the spectrum measurement, at least one optical element is placed in the holding apparatus  10  by following steps: 
         [0026]    In step  1 , the first guide pin  14  and the second guide pin  15  are taken out, thereby the fixed board  11   a,  the receiving board  12 , the light-blocking board  13  are separated. 
         [0027]    In step  2 , an optical element  20  is placed in one of the cylinder receiving spaces  121 , thereby the optical element  20  is held in the first cylindrical receiving portion  121 . 
         [0028]    In step  3 , the holding apparatus  10  is assembled. Firstly, the fixed board  11   a  and the light-blocking board  13  are joined together by inserting the second guide pin  15  into the second pinhole  115  and the second toothed hole  132  in succession and meshing the toothed end  150  with the second toothed hole  132 . Secondly, the fixed board  11   a  and the receiving board  12  are joined together by inserting the first guide pin  14  into the first pinhole  114  and the first toothed hole  123  in succession and meshing the toothed end  140  with the first toothed hole  123 . Finally, the first through hole  111  on the fixed board  11   a  is selectively aligned with the receiving holes  120  holding the optical element  20  and the corresponding second through hole  131 . 
         [0029]    Referring to  FIG. 5 , in a spectrum measurement process, a light beam is passed through the optical element  20 , and the spectrum of the light transmitted through the optical element  20  can be obtained and analyzed by spectrometers. 
         [0030]    While the present invention has been described as having preferred or exemplary embodiments, the embodiments can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the embodiments using the general principles of the invention as claimed. Furthermore, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains and which fall within the limits of the appended claims or equivalents thereof.