Abstract: The phase of laser light is modulated by a phase modulating array, and a hologram image is projected on a rotating screen. Light emission of the laser light is driven by PWM modulation so that a light emission period and a non-light emission period following the light emission period are repeated. In a case where the luminance of the hologram image is changed, the duty ratio of the light emission period is changed. In a case where the luminance is significantly reduced, the light emission intensity of the laser light is reduced without changing the duty ratio. Since the duty ratio is not reduced, a light diffusion condition on the rotating screen can be randomized even in a case where the luminance is reduced.

Abstract: In an angular speed detection apparatus according to the present embodiment, in a positive counter, a first counter value P is obtained by adding 3 when an average angular speed “ASMAV (deg/s)” calculated at each “time” is higher than or equal to, for example, 3000 (deg/s) and subtracting 1 when the average angular speed is lower than 3000. In a negative counter, a second counter value M is obtained by adding 3 when the average angular speed “ASMAV (deg/s)” is lower than or equal to ?3000 (deg/s) and subtracting 1 when the average angular speed is higher than ?3000. When the first counter value or the second counter value has exceeded a predetermined error threshold (for example, 20), it is determined that an error has occurred.

Abstract: A rear-view mirror driving and controlling mechanism comprising a rear-view mirror manipulator for moving the mirror angle position of the rear-view mirror, a reverse signal detector for generating reverse position signals when the transmission is shifted to the reverse position, a controller for moving the rear-view mirror angle on the basis of the operation status of a rear-view mirror manipulator and the detection result of the presence or absence of reverse position signals, a mirror angle detector for generating angle detection signals indicative of the mirror angle of the rear-view mirror, and a mirror angle storage for storing angle detection signals, wherein the controller stores the angle detection signals generated by the rear-view mirror angle detector into the mirror angle storage for each time the mirror angle position is adjusted at the time when the reverse detection signals are not generated, while moving down the rear-view mirror position angle at the time when the reverse detection signals a