Lens adjustment for a light emitting diode print head

Details Lens adjustment for a light emitting diode print head Lens adjustment for a light emitting diode print head

1989-01-19

1990-02-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

346155, H01J 314, G01D 1506

Patent

active

049048627

ABSTRACT:
A print head for a light emitting diode printer has a row of LEDs on a mother plate and an end mounting plate secured at each end of the mother plate. A linear lens array is positioned over the LEDs. The optical elements of the print head are adjusted by mounting these components in a fixture having an optical image analyzer for analyzing the quality of image from an individual LED projected onto the face of the analyzer. The total conjugate or spacing between the row of LEDs and the image analyzer is adjusted for maximizing image quality. One end of the lens array between the LEDs and analyzer is adjusted for maximizing the quality of an image of an LED on the optical analyzer. The spacing of the second end of the lens array is then adjusted for maximizing the quality of an image of an LED near the other end of the row. The adjustment steps may be repeated for optimizing the LED images. After adjustment, the position of the lens array is locked in the end mounting plates. A bearing reference surface on each end plate is locked against a reference surface on the analyzer. When the print head is mounted in a printer, the reference surfaces on the end mounting plates serve to position the print head with the LED images focused on the photoreceptive surface of the printer.

REFERENCES:
patent: 4424524 (1984-01-01), Daniele
patent: 4703334 (1987-10-01), Mochimaru

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