Optical control device
AssigneeBrother Kogyo Kabushiki Kaisha
InventorIsao Kubo
Life of this patent
Estimating the term…
Abstract
An optical control device includes a semiconductor laser that generates a light according to a drive current, a light amount detecting unit that detects a light amount of the light generated by the semiconductor laser; and a controller that controls the drive current to adjust the light amount to a target value by referring to a referring number of detection results of the light amount by the light amount detecting unit. The referring number at a time when the controller starts the drive current flowing is smaller than the referring number after the detection result of the light amount reaches a predetermined value.
Claims13
An optical control device comprising:
- a semiconductor laser that generates a light according to a drive current;
- a light amount detecting unit that detects an amount of light generated by the semiconductor laser;
- and
- a controller that controls the drive current to adjust the amount of light toward a target value by using a control value that is calculated using at least one detection result from the light amount detecting unit,
- wherein a first number of detection results used in calculating one control value at a time when the controller starts the drive current flowing is smaller than a second number of detection results used in calculating one control value after the detection result of the amount of light reaches a predetermined value.
An optical control device comprising:
- a semiconductor laser that generates a light according to a drive current;
- a light amount detecting unit that detects an amount of light generated by the semiconductor laser;
- and
- a controller that controls the drive current to adjust the amount of light to a target value and includes:
- a storage that stores a plurality of detection results from the light amount detecting unit;
- an average calculating unit that calculates an average of a number of detection results of the amount of light stored in the storage;
- and
- a current controller that controls the drive current based on the average calculated by the average calculating unit,
- wherein a first number of detection results for calculating the average of the detection results at the time when the controller starts the drive current flowing is smaller than a second number of detection results for calculating the average of the detection results after the detection result of the amount of light reaches the predetermined value.
Dependencies are inferred from the claim text.