Manually codeable cards for card readers
BACKGROUND OF THE INVENTION 
     This invention concerns a kind of manually codeable cards for card readers. So far cards for card readers have usually been made by using a punching card machine which punches a lot of different combination of transparent and opaque holes in a card, in other words, a coded number in a card. So without a punching card machining a card cannot be made a card having a coded number, and it is not so convenient in using a card for a card reader. 
     SUMMARY OF THE INVENTION 
     In view of the inconvenience that a card for a card reader has to be punched by a punching card machine for being given a coded number, the inventor has thought out this new manually codeable card for a card reader. 
     This new card is made up of a sheet of transparent plastic, or metal and a sheet of paper, and the sheet of paper is printed with opaque ink, being left a plurality of uninked circles for a ray to pass through. Then these circles can be printed on opaque circles from a transposable paper to become opaque so as to make up a different combination of transparent circles with opaque ones, in other words, a coded number. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a structural view of the manually codeable card in this invention. 
     FIG. 2 is a view of the paper with transposable opaque circles in this invention. 
     FIG. 3 is a view of this card already manually coded by transposing a number of opaque circles on transparent circles in this invention. 
     FIG. 4 is view of this card already finished in this invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     This manually codeable card for card readers, as FIG. 1 shows, is made up of an upper sheet 1 and a lower sheet 2; the former and the latter are all made of a transparent material like plastic, metal or paper, and one side of the upper sheet 1 is coated with a kind of glue and protected with a peeling-off oiled sheet 3. The lower sheet 2 is printed all over with opaque ink except a plurality of circles 4 which still have transparent property. 
     Next, FIG. 2 shows a kind of paper 5 with the same number of transposable opaque circles on it as the circles on the lower sheet 2. This paper has the same number of black inked circles 6 as those on the lower sheet 2 that can be transposed on the lower sheet 2, but the black inked circles 6 can be substituted by a kind of round opaque stickers. 
     When this card is going to be manually coded with a certain number, that number of black inked circles 6 or the round opaque stickers on the paper 5 should be transposed on the lower sheet 2, and FIG. 3 shows the lower sheet 2 transposed on with a coded number. 
     Lastly, FIG. 4 shows that the upper sheet 1 and the lower sheet 2 have been stuck together correctly to become a finished card, with the peeling-off oiled sheet 3 removed from the upper sheet 1 and the glue side of the upper sheet 1 facing the printed side of the lower sheet 1. Then this card has been finished manually coded.