Patent ID: 9344693
Filing Date: 2016-05-17
CPC Classification: G02B,H04N

Claim Text:
1. A drive control apparatus comprising: a horizontal control section configured to control a scanning mirror for horizontal scanning with laser light, the scanning mirror being driven at a fixed frequency in a horizontal direction; and a vertical control section configured to control the scanning mirror for vertical scanning based on the frequency at which the horizontal control section drives the scanning mirror in the horizontal direction, the vertical control section outputting a vertical drive signal to control the scanning mirror for the vertical scanning, the vertical drive signal including an interval in which the laser light is directed vertically from top to bottom and an interval in which the laser light is directed vertically from bottom to top, the intervals alternately producing an output of a predetermined amount, wherein on the vertical drive signal that is output by the vertical control section to control the scanning mirror for the vertical scanning, processing is performed to enable video display on a frame basis alternately in the intervals in the vertical drive signal, in the intervals, the laser light being directed vertically from top to bottom and from bottom to top, wherein the vertical control section measures a delay when processing is performed on a signal that indicates a vertical angle of the scanning mirror, the delay being used as a basis to change a timing when to generate the vertical drive signal from the drive waveform data, and wherein the vertical drive signal has a waveform showing approximately a same slope in the intervals in which the laser light is directed vertically from top to bottom and from bottom to top.