Magnification viewer

Abstract

A housing for a magnification loupe is provided having a body portion for an eyepiece lens and a nose portion for an objective lens. The body portion for the eyepiece lens includes outer circumferential threads over which the objective nose portion fits. The objective nose portion includes a pin slot defining an arc across the body of the nose. The arc is configured such that a pin may be secured through the holes in the nose piece to co-act with the threads of the eyepiece body such that radial movement is prohibited.

We claim:  
     
         1 . A magnification loupe carried by spectacles, comprising: 
 a two-element eyepiece lens;    a three-element objective lens; and    a two-element prism disposed between said eyepiece lens and said objective lens;    the loupe having a working distance in the range of approximately 12 inches to approximately 24 inches;    the loupe having a magnification in the range of approximately 3.3 to approximately 4.8;    the spacing S 1  between said eyepiece lens and said prism, along an optical centerline, in the range of approximately 3.63 mm to approximately 25.16 mm;    wherein the said lenses and said prism are constructed and arranged according to the following parameters:                                                        Element   Glass   nd   vd   Radius   Thickness   Diameter   Sep.                                                   I   Ohara   1.7015   41.2   R 1  = 42.19   3.5   13.4             BAH 27           R 2  = 12.45     II   Ohara   1.8052   25.4   R 3  = 12.45   1.5   13.4         PBH6W           R 3  = 36.00     Prism A   BAK4   1.5688   56.13               S 2  = 3.41         LAK10   1.7200   50.41               S 3  = 2.33     Prism B   BAK4   1.5688   56.13               S 4  = 0.5         LAK10   1.7200   50.41               S 5  = 22.8     III   Ohara   1.5410   47.2   R 4  = PLANO   3.0   12.0         S-TIL2           R 5  = 12.61     IV   Ohara   1.923   21.3   R 5  = 12.61   1.5   15.4         PBH71           R 6  = 12.61     V   SCHOTT   1.5168   64.2   R 7  = 10.06   7.1   15.4         BK7           R 6  = 12.61     VI   SCHOTT   1.744   44.8   R 8  = 25.11   4.7   17.5         S-LAM2           R 9  = 25.11                                                            wherein the Roman numerals I-VI identify respective lens elements of said eyepiece lens and said objective lens, from eyepoint side to object side; nd represents the refractive index of each element; vd is the Abbe dispersion number; R1-R9 represent the radii, in millimeters, of the respective refractive surfaces, in order from the eyepiece side to the object side; and the thickness and separation parameters represent the thicknesses of the lens elements and the air spaces, respectively, in millimeters, from the eyepoint side to the object side, measured along an optical centerline.    
     
     
         2 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 12 inches, a magnification of 3.3 and said spacing between said eyepiece and said prism is 6.96 mm.  
     
     
         3 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 16 inches, a magnification of 3.3 and said spacing between said eyepiece lens and said prism is 5.1 mm.  
     
     
         4 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 24 inches, a magnification of 3.3 and said spacing between said eyepiece lens and said prism is 3.63 mm.  
     
     
         5 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 12 inches, a magnification of 3.8 and said spacing between said eyepiece lens and said prism is 12.38 mm.  
     
     
         6 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 16 inches, a magnification of 3.8 and said spacing between said eyepiece lens and said prism is 9.92 mm.  
     
     
         7 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 24 inches, a magnification of 3.8 and said spacing between said eyepiece lens and said prism is 8.02 mm.  
     
     
         8 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 12 inches, a magnification of 4.3 and said spacing between said eyepiece lens and said prism is 18.7 mm.  
     
     
         9 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 16 inches, a magnification of 4.3 and said spacing between said eyepiece lens and said prism is 15.56 mm.  
     
     
         10 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 24 inches, a magnification of 4.3 and said spacing between said eyepiece lens and said prism is 13.13 mm.  
     
     
         11 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 12 inches, a magnification of 4.8 and said spacing between said eyepiece lens and said prism is 25.16 mm.  
     
     
         12 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 16 inches, a magnification of 4.8 and said spacing between said eyepiece lens and said prism is 21.23 mm.  
     
     
         13 . The magnification loupe of  claim 1 , wherein the loupe has a working distance of 24 inches, a magnification of 4.8 and said spacing between said eyepiece lens and said prism is 18.22 mm.