Abstract: In an alternating-current driving-type display device utilizing the plasma discharge, a discharge maintaining electrode group composed of a plurality of discharge maintaining electrodes (I) and an address electrode group composed of a plurality of address electrodes (J) are formed on one substrate (22), the address electrode group which crosses the discharge maintaining electrode group through an insulator layer (27) and a discharge starting address group from a plurality of discharge starting address electrodes (K) composing a part of the address electrode group are continuously formed at the same time, the discharge maintaining electrode group and the discharge starting address electrode group are formed on the same plane, and a dielectric layer is formed on the discharge maintaining electrode group, the address electrode group and the discharge starting address electrode group.

Abstract: In an optical axis correction device for correcting an optical axis within an optical spatial transmission device, a displacement of focal point can be prevented and a responding speed in rotation of the mirror can be made fast. As the incident light is reflected against the reflection surface of the mirror and radiated against the position sensing sensor, a displacement amount .DELTA.S between the incident point P1 on the position sensing sensor and the reference position P0 is detected at the optical axis correction device. In order to correct the optical axis only by the amount of displacement .DELTA.S, the Y-axis driving mechanism is driven to change an angle of the reflection surface of the mirror. At this time, the position of the reflecting portion on the reflection surface in a direction of Z-axis is prevented from being displaced. For example, a driving force of "-2" is applied to the first Y-axis driving mechanism and concurrently a state of ".+-.0" is held at the second Y-axis driving mechanism.

Abstract: Disclosed is an optical axis correcting device which allows high accuracy optical axis adjustment and which has an excellent responsiveness. An optical communication device suited for long distance optical communication using this optical axis correcting device is provided. A two-axis spring for setting a mirror includes a first annular section, a second annular section on the outer side of the first annular section and concentric thereto, and a third annular section on the outer side of the second annular section and concentric thereto, wherein the first annular section and the second annular section are connected together by a pair of X-axis bridges which allow torsional rotation and which are opposed to each other with the center of the concentric circle therebetween, wherein the second annular section and the third annular section are connected together by similar Y-axis bridges.

Abstract: The apparatus is to be reduced in size and consumption of utility items is to be decreased, while the connection is to be facilitated by the in-line transporting system. The grinding apparatus includes a turntable 21 for securing a glass master disc 30 for rotating the glass master disc 30, a polishing pad 11 caused to bear against the grinding surface of the glass master disc 30 secured to the turntable 21 with a pre-set pressure and a slurry nozzle 14 for supplying the grinding liquid to the grinding surface of the glass master disc 30. The polishing pad 11 is thrust against the glass master disc 30 rotated by rotation of the turntable 21. The glass master disc 30 has its grinding surface ground as the grinding liquid is supplied to the grinding surface.