Abstract
We describe four kinds or HMDs and 3D application systems which were developed at MR Project in about four years. The first one is an optical see-through HMD with wider FOV(H51° V37°) accomplished by the Free-Form-Surface prism. The second one is a video see-through HMD "COASTAR" designed so that the optical axes of cameras are coincide with the optical axes of display systems of the HMD. The third one is an optical see-through HMD developed in order to use out of doors. The last one is an optical see-through HMD with video cameras designed so that the optical axes of cameras coincide with the optical axes of display systems and the optical axes of optical see-through systems.
