Method of correcting the amounts of emitted light

Details Method of correcting the amounts of emitted light Method of correcting the amounts of emitted light

1997-05-07

2000-08-08

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

B41J 2435

Patent

active

06100913&

ABSTRACT:
A method is used for correcting amounts of light of light emitting elements. A first correction range is defined which has a median of maximum and minimum values of the amounts of light of the light emitting elements, and includes a predetermined number of first subdivided ranges. If the minimum amount of light is not within the first correction range, a second correction reference is produced which is smaller than the first correction reference by a predetermined fraction of the difference between the maximum and minimum values. Then, a second correction range is defined which includes the minimum amount of light, has the second correction reference in its middle, and includes a predetermined number of second subdivided ranges. The amounts of light are corrected by increasing the amount of light if the measured amount of light is smaller than the second correction reference and decreasing the amount of light if the measured amount of light is larger than the second correction reference, the amounts of light being increased or decreased by the correction value corresponding to the second subdivided range. The first correction range may be set to include the minimum and maximum values therein, and the first and second subdivided ranges may progressively widen as the first subdivided ranges becomes increasingly far away from the first correction reference.

REFERENCES:
patent: 5586055 (1996-12-01), Ng et al.
patent: 5699103 (1997-12-01), Fleming
patent: 5774165 (1998-06-01), Nakajima et al.

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