Abstract: A boom vibration control device includes a fluid pressure cylinder provided between a boom and a boom support body, the fluid pressure cylinder biasing the boom in one rotating direction and a metal spring provided between the boom and the boom support body, the metal spring biasing the boom in the other rotating direction.

Abstract: The present invention was accomplished in order to provide broadcast terminal equipment and an information supply system, with which the convenience of a viewer can be improved by preparing a program list in which favorite programs of the viewer can be easily found out and automatically recording the viewer's favorite programs with the utilization of the viewer's watching program data, and moreover, a variety of information and services can be provided by making use of the viewer's watching program data with taking advantage of an interactive function, comprising a viewer's program data storage device to store program data related to programs a viewer watched, an each viewer's program list preparing device to prepare a favorite program list of the viewer based on the program data stored in the viewer's program data storage device, a favorite program detecting device to detect a program which fits into the favorite program list of the viewer prepared by the each viewer's program list preparing device in a prog

Abstract: A method for detecting a minute displacement of a probe includes an emission from a light source of two light beams having different polarizing directions. The light beams are subsequently diverged by a first lens so as to pass through a beam splitter towards a separating prism. The light beams having passed through the prism are separated into first and second measuring beams which are subsequently focused by a second lens on first and second, spaced reflecting surfaces. The first and second measuring beams are then reflected by the first and second reflecting surfaces, respectively, so as to enter respective photodetectors after having passed through the separating prism, the beam splitter and a polarizing beam splitter for passing therethrough the first and second measuring beams or reflecting them depending on the polarizing direction of the incoming light.

Abstract: A displacement detector device has a source of laser beam; a diffraction grating for separating the laser beam into a plurality of beam components; a filter for shielding the beam components other than the two beam components of .+-. primary order produced by the diffraction grating; a wavelength plate operable to vary the polarized state of one of the two beam components of .+-. primary order; a lens element for focusing the two beam components of .+-. primary order on a displacement plane and a reference plane, respectively; and a photosensor. The two beam components of .+-. primary order focused on the reference and displacement planes, respectively, are subsequently reflected therefrom and are then collimated by the lens element after having again entered the lens element in substantially overlapped relationship.