Patent ID: 11874457
Assignee: MARADIN LTD.
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 4:
5. An image projection system comprising:
a scanning mirror having an operating frequency which is, on a at least one occasion, unequal to a target frequency at which the mirror is to operate;
an actuator; and
logic which controls the scanning mirror to project at least one image, including repeatedly providing a measurement of the scanning mirror's operating frequency, and, responsively, controlling the actuator to apply at least one force, to the mirror, which causes the mirror's instantaneous operating frequency to equal the target frequency, thereby to enhance image quality by maintaining a uniform operating frequency over time;
the system also comprising a sensor of the mirror's position or scanning angle which measures a signal proportional to the periodic scanning motion;
wherein the logic receives a reading from the sensor, multiplies the reading by a constant thereby to obtain a scalar number, and commands the motor to apply a second force, whose magnitude equals the scalar number, to the mirror, wherein the logic multiplies the reading by a spring constant.