Patent ID: 7616225

Claim:
A production method for producing an exposure apparatus including: an exposure head having a light-emitting device whose light emission intensity varies with a supplied electric current value, a light modulating device having a plurality of pixels, and a light guiding means for guiding light from said light-emitting device to said light modulating device, and a control means for controlling said exposure head, said method comprising the steps of: supplying a reference electric current to said light-emitting device, and measuring the amount of light from each of said plurality of pixels of said light modulating device; determining whether a minimum value among the amounts of light measured from said plurality of pixels lies within a predetermined range; determining the value of the electric current to be supplied to said light-emitting device so that said minimum value of said amounts of light falls within said predetermined range when said minimum value of said amounts of light is outside of said predetermined range; supplying said determined electric current value to said light-emitting device; measuring a second amount of light from each of said plurality of pixels of said light modulating device by driving all of said plurality of pixels at a prescribed driving grayscale level; detecting a second minimum value among said second amounts of light measured from said plurality of pixels; and determining, by reference to said second minimum value, correction values of said light modulating device for correcting variations of said second amount of light among said plurality of pixels so that said second amount of light from each of said plurality of pixels falls within a prescribed range.