Focusing for optical print heads

Details Focusing for optical print heads Focusing for optical print heads

1987-03-23

1990-01-16

Rosenberger, Richard A.

Optics: measuring and testing

Focal position of light source

355238, G06K 1512, G03G 1504

Patent

active

048939269

ABSTRACT:
A device for generating printed output has an array of point light sources focused onto a photosensitive surface. The array is spaced from the surface substantially at the position of best focus by generating a pattern of activated and unactivated light sources along the array such that a pair of light sources which lead to the creation of an image on the output are separated by a light source which does not lead to the creation of an image. Since the image size grows in width as the focus decreases, the width of the space between images can be used as a focusing gauge, and appropriate adjustments can be made to maximize the width of the space.

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Brock, G. C., "The MTF as an Aid to Focusing Aerial Cameras", Conference: Image Assessment & Specification, Rochester, N.Y., (May 20-22, 1974), pp. 193-201.
Perrin et al., "Photographic Sharpness and Resolving Power. II"; Journal of the Optical Society of America, vol. 41, No. 4, (Apr. 1951), pp. 265-272.
"Accepted Standard for 16-mm Projection", International Projectionist, Jul. 1952, pp. 23-24.
"Visual Determination of Optimal Focus in a Wafer Stepper"; IBM Technical Disclosure Bulletin, vol. 29, No. 2, (Jul. 1986), pp. 681-682.

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