Method and apparatus for positioning microfiche card

Claim 1

A method of moving a microfiche card including a matrix arrangement of a large number of frame images arranged in X and Y directions so as to position a required frame image to be projected onto a screen in an optical projection path comprising the steps of: calculating the address numbers NS(X) and NS(Y) of a required frame image in X and Y directions, respectively, using the equations NS(X)=PF(X)·(AS(X)/AF(X) NS(Y)=PF(Y)·(AS(Y)/AF(Y) in which AF(X) and AF(Y) represent the total number of frame images on the microfiche card in X and Y direction, respectively; AS(X) and AS(Y) represent the maximum number of pulse signals required to move the microfiche card from a position where the frame image placed at one end of the microfiche card is positioned in the optical projection path to a position where the frame image placed at the opposite end of the microfiche card in X and Y direction, respectively, is positioned in the optical projection path; PF(X) and PF(Y) are the location numbers of said required frame image in X and Y direction, respectively, which designate the position of said required frame image relative to the position of a predetermined datum frame image on the microfiche card; rounding off the numbers obtained by calculating said equations to the nearest integer so as to make said address numbers NS(X) and NS(Y) integral figures respresenting an integral number of pulse signals; calculating the numbers of MS(X) and MS(Y) representing the number of pulse signals required to move the microfiche card, in X and Y direction, respectively, from a present position to said required position using the equations MS(X)=NS(X)-OS(X) MS(Y)=NS(Y)-OS(Y) in which OS(X) and OS(Y) are integral numbers representing the address numbers in X and Y direction, respectively, of the frame image presently positioned in the optical projection path; moving a stage on which the microfiche card is placed and held in X and Y direction by means of pulse motors; driving said pulse motors according to said calculated pulse signal numbers MS(X) and MS(Y), respectively.

Claim 2

A method of moving a microfiche card including a matrix arrangement of a large number of frame images arranged in X and Y directions so as to position a required frame image to be projected onto a screen in an optical projection path comprising the steps of: calculating the address numbers NS(X) and NS(Y) of a required frame image in X and Y directions, respectively, using the equations NS(X)=PF(X)·(AS(X)/AF(X) NS(Y)=PF(Y)·(AS(Y)/AF(Y) in which AF(X) and AF(Y) represent the total number of frame images on the microfiche card in X and Y direction, respectively; AS(X) and AS(Y) represent the maximum number of pulse signals required to move the microfiche card from a position where the frame image placed at one end of the microfiche card is positioned in the optical projection path to a position where the frame image placed at the opposite end of the microfiche card in X and Y direction, respectively, is positioned in the optical projection path; PF(X) and PF(Y) are the location numbers of said required frame image in X and Y direction, respectively, which designate the position of said required frame image relative to the position of a predetermined datum frame image on the microfiche card; rounding off the numbers obtained by calculating said equations to the nearest integer so as to make said address numbers NS(X) and NS(Y) integral figures respresenting an integral number of pulse signals; calculating the numbers of MS(X) and MS(Y) representing the number of pulse signals required to move the microfiche card, in X and Y direction, respectively, from a present position to said required position using the equations MS(X)=NS(X)-OS(X) MS(Y)=NS(Y)-OS(Y) in which OS(X) and OS(Y) are integral numbers representing the address numbers in X and Y direction, respectively, of the frame image presently positioned in the optical projection path; moving a stage on which the microfiche card is placed and held in X and Y direction by means of pulse motors; driving said pulse motors according to said calculated pulse signal numbers MS(X) and MS(Y), respectively.