Katsutoshi Hibino

Hi-vision optical video disc

The formats of the four signals recorded on the high definition optical video disk system are discussed. The first signal is a video carrier FM-modulated with a bandwidth-compressed signal for use in HDTV broadcasting through a satellite. The second is a pilot signal for turntable motor control and jitter compensation. The other two consist of PCM stereo sound, one using time-division and the other frequency-division multiplexing. The resulting disk offers high-definition pictures and high-fidelity sound, and has a playing time of 60 minutes (total for both sides). >

3D HDTV video disc system

A hi-vision three-dimensional system with two MUSE videodisc players and a 6-tube-type projector called hi-vision, has been developed. Using the hi-vision picture, excellent three-dimensional video pictures can be presented on large-scale screens. The two videodisc players enable synchronized replaying to reproduce three-dimensional images. A 6-tube-type projector with two-way RGB input is adopted for display. By using laser discs, long-time consecutive video replay is possible. In case of replaying without three-dimensional characteristics, long-term replay or repeated replay of two different hi-vision programs can be presented by operating the two players alternately. >

Fabrication of Laser Beam Axis Compensator by Photonic Crystal Technique for Optical Pickup Units

A laser beam axis compensator was fabricated for an optical pickup unit with blue and red lasers. The device consisted of multiwavelength wave plates and a double-refractive-index material. The wave plates were realized by a photonic crystal technique. By measuring the beam profiles of the blue and red lasers, the device was confirmed to function as a laser axis compensator. Under 110 µm laser beam axis shift setting conditions, readout signal patterns from an optical disc were measured.