Laser recording apparatus with laser intensity control

Details Laser recording apparatus with laser intensity control Laser recording apparatus with laser intensity control

1988-10-19

1990-01-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

346108, G05D 2502, H01J 4014

Patent

active

048945242

ABSTRACT:
A laser recording apparatus for recording a continuous tone image on a photosensitive material by scanning the material with an analog light beam which was intensity-modulated on the basis of an image signal is disclosed. The apparatus uses a semiconductor laser as a light beam source, and the emission light level of the semiconductor laser is controlled according to an image signal by making use of the charging and discharging of a capacitor and without making use of the well-known APC circuit. Thus, the apparatus is free from the problem of circuit oscillation that arises when using an APC circuit and permits a repeatedly increasing and decreasing emission light level instruction signal to be followed by the semiconductor emission light level accurately and with a satisfactory response speed, so that it is possible to record a continuous tone image at a high speed and with high accuracy.

REFERENCES:
patent: 4443695 (1984-04-01), Kitamura
patent: 4695714 (1987-09-01), Kimizuka et al.
patent: 4710779 (1987-12-01), Funaki et al.
patent: 4751377 (1988-06-01), Ishizaka et al.

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