Patent ID: 6914661

Claim:
A cell gap adjusting device for adjusting a thickness between pairs of substrate plates in liquid crystal cells having liquid crystal filled between the pairs of substrate plates bonded together through a seal member having a frame form and an opening in a predetermined point of a frame wall thereof, the cell gap adjusting device comprising: supporting means having at least two pairs of supporting jigs for clamping to support at least two of the liquid crystal cells and closing seals in a frame form arranged between the liquid crystal cell and the supporting jigs to form an enclosed space by both outer surfaces of the one pair of substrate plates of the liquid crystal cell, opposed surfaces of the one pair of support jigs to the liquid crystal cell and an inner surface of the closing seals, the at least two pairs of supporting jigs including at least one light transmissive supporting jig supporting one of the liquid crystal cells; a lamp operable to irradiate the light transmissive supporting jig with light; pressurizing means for simultaneously pressurizing both outer surfaces of each of the pairs of substrate plates of the liquid crystal cell by a fluid introduced in each enclosed space based on a pressure signal; and control means for detecting a cell gap of the one of the liquid crystal cells based on light from the lamp transmitted through the light transmissive supporting jig which supports the one of the liquid crystal cells, calculating a pressure for pressurizing both outer surfaces of each of the pairs of substrate plates of each liquid crystal cell on the basis of the detected cell gap and generating and delivering the pressure signal to the pressurizing means.