Abstract: An image projection device includes: a first mirror oscillating to scan an image light beam forming an image projected onto a retina of a user; a light source emitting the image light beam and a detection light beam to the first mirror at different timings; a second mirror having a first region reflecting the image light beam reflected by the first mirror to the retina and a second region reflecting the detection light beam reflected by the first mirror in a direction different from a direction in which the image light beam is reflected, and scanning neither the image light beam nor the detection light beam reflected by the first mirror; a detector detecting the detection light beam reflected by the second region; and a controller adjusting oscillation of the first mirror and an emission timing of the image light beam based on a detection result by the detector.

Abstract: An image projection device includes: a first mirror oscillating to scan an image light beam forming an image projected onto a retina of a user; a light source emitting the image light beam and a detection light beam to the first mirror at different timings; a second mirror having a first region reflecting-the image light beam reflected by the first mirror to the retina and a second region reflecting the detection light beam reflected by the first mirror in a direction different from a direction in which the image light beam is reflected, and scanning neither the image light beam nor the detection light beam reflected by the first mirror; a detector detecting the detection light beam reflected by the second region; and a controller adjusting oscillation of the first mirror and an emission timing of the image light beam based on a detection result by the detector.

Abstract: A tape cassette loading system is provided in a magnetic recording and/or reproducing apparatus for loading a tape cassette into the apparatus. The tape cassette generally comprises a cassette case having a front lid, a pair of tape reels accommodating a magnetic tape thereon within the cassette case and a window at a side wall of the cassette case to expose a reel flange of the tape reels, which reel flange is engageable with a reel driving system of the apparatus. The tape cassette loading system includes a cassette holder having a frame body into which the tape cassette is loaded, and a tape slack take-up mechanism provided on the cassette holder at a position corresponding to the window of the cassette case. Thus, any tape slack of the magnetic tape developed in the cassette case, is taken-up by the tape slack take-up mechanism upon loading the tape cassette into the cassette holder.