Abstract: A precision motion transducer is provided in the present invention. The precision motion transducer is provided with a first elastic body. An end of the first elastic body is connected to an end of a second elastic body, while the other end of the second elastic body is fixed to a base via a fixing means. A motion input means is connected to the other end of the first elastic body for inputting motion inputs, while a motion output means is provided at a location where the first elastic body is connected with the second elastic body for outputting motion outputs. The modulus of elastic of the first elastic body is smaller than the modulus of elastic of the second elastic body, whereby relatively large motion inputs can be converted to more precise and finer motion inputs, so as to attain precise positioning control.

Abstract: An optical pickup head and an electromagnetic actuating device thereof are provided. The electromagnetic actuating device is used to move an objective lens carrier having an objective lens assembly to form an optical pickup head. The electromagnetic actuating device includes at least a magnet, at least a coil, and at least a yoke. The magnet is spaced apart from the objective lens carrier by a distance, and the coil is disposed at the objective lens carrier, for generating an electromagnetic force to interact with the magnet. The yoke is spaced apart from the objective lens carrier by a distance, in which the yoke has a protruding part that extends towards the objective lens carrier and is used to attract magnetic flux lines produced by the magnet, and thus making the magnetic flux that passes through the coil be distributed evenly.

Abstract: An optical pickup head and an electromagnetic actuating device thereof are provided. The electromagnetic actuating device is used to move an objective lens carrier having an objective lens assembly to form an optical pickup head. The electromagnetic actuating device includes at least a magnet, at least a coil, and at least a yoke. The magnet is spaced apart from the objective lens carrier by a distance, and the coil is disposed at the objective lens carrier, for generating an electromagnetic force to interact with the magnet. The yoke is spaced apart from the objective lens carrier by a distance, in which the yoke has a protruding part that extends towards the objective lens carrier and is used to attract magnetic flux lines produced by the magnet, and thus making the magnetic flux that passes through the coil be distributed evenly.

Abstract: A method for measuring a surface structure of a near-field object is provided. A light source produces at least a first light beam and a second light beam; guiding the first light beam and the second light beam to enter the SIL for interacting with the object surface. This method can be used in, for example, a near-field optical disc storage system, wherein reflection intensities of the first and second light beams are used to measure two distances between the SIL and the optical disc at two positions corresponding to the first and second light beams. A surface structure, such as a tilt angle or an average distance between the disc and the SIL or disc roughness, is obtained by analyzing the above-mentioned positions and distances. The first and second light beams are produced, for example, by a diffraction technology or by a single laser diode with multiple beams.

Abstract: A precision motion transducer is provided in the present invention. The precision motion transducer is provided with a first elastic body. An end of the first elastic body is connected to an end of a second elastic body, while the other end of the second elastic body is fixed to a base via a fixing means. A motion input means is connected to the other end of the first elastic body for inputting motion inputs, while a motion output means is provided at a location where the first elastic body is connected with the second elastic body for outputting motion outputs. The modulus of elastic of the first elastic body is smaller than the modulus of elastic of the second elastic body, whereby relatively large motion inputs can be converted to more precise and finer motion inputs, so as to attain precise positioning control.