Abstract: Provided are a first moving unit 2a which, as an unit, moves an objective lens 23 and a relay lens 19 on the objective lens side out of a pair of relay lenses to an irradiation position of a recording medium 51, and a second moving unit 2b which moves a pair of reflectors 15, 17 as a unit.

Abstract: An image formation-type soft X-ray microscopic apparatus comprises:a pulse X-ray source for applying X-rays;a single concave aspherical multilayer film condenser for reflecting the X-rays emitted from the pulse X-ray source so as to condense the X-rays on a sample;a two-dimensional X-ray imaging element;a phase zone plate objective optical system for forming a image of the sample on the two-dimensional imaging element by using the X-rays;an image processing circuit connected to the two-dimensional X-ray imaging element; andan output circuit connected to the image processing circuit for the purpose of outputting an image of the sample.

Abstract: An optical disk apparatus effect recording reproduction and erasure of information by irradiation with laser beams on an optical disk. In the optical disk apparatus, a plurality of beam heads are correspondingly provided for respective recording regions defined by radially dividing a recording zone on the optical disk.

Abstract: A reproducing apparatus for magneto-optical discs has a moving head portion and a fixed head portion. Light reflected from the disc is divided into two parallel light beam components having different planes of polarization. These light beam components are transmitted to corresponding light intensity detectors of the fixed head portion. The outputs of the detectors are unaffected by movement of the movable head portion relative to the fixed head portion radially of the disc and are unaffected by movement of the movable head portion in other directions due to inaccuracies in the slider mechanism that moves the movable head portion radially.

Abstract: An optical head system for accurately detecting the relative positions of a spot of Gaussian beam and a recording track. The optical head system includes an objective lens adapted to be moved in a tracking direction for the tracking of the recording track by the beam spot, a light detector arranged stationary, and movable optical means arranged between the objective lens and the light detector such that the beam spot reflected from the recording track and projected on the light detector through the objective lens is held stationary on the light detector with respect to the movement of the objective lens.

Abstract: A device for tracking a movable body along a linear path parallel to a plane includes a linear motor for driving the body along the linear path. The body is mounted, as by rollers, for movement along a guide, such as a pair of parallel guide rails, supported on a base which also supports the motor. To enhance stability of the body during tracking movement, the rollers or other mounts for the body are urged against the guide by the magnetic action of a flux which is separate from the principal flux used to generate thrust for the linear motor and which provides an attractive force against preferably a pair of members, such as steel plates, of high magnetic permeability fixed to the movable body.

Abstract: Electronic camera comprises an image taking unit and a memory unit connected detachably. The image taking unit generates image signals corresponding to an object. The image signals are transmitted to the memory unit to be stored therein. The memory unit is detached from the image taking unit and connected to an external memory device such as a video tape recorder. The image taking unit has a monitor which can display the image signals in visual form before recording them in the memory unit.