Abstract: A dropping nozzle includes: a flow passage part that includes a flow passage that molten glass passes through; and an opening part that includes an opening that communicates with the flow passage, the opening part dropping the molten glass as a glass drop, wherein the opening includes a plurality of inclined parts in which adjacent inner inclination angles are different from each other in a section parallel to a center axis of the flow passage part, and from among the plurality of inclined parts, a first inclined part that is closest to the flow passage part has an inner inclination angle that is smaller than an inner inclination angle of a second inclined part that is farthest from the flow passage part.

Abstract: A display member includes an optical surface and a member engaging unit. The member engaging unit includes a thick portion and a thin portion that has a size smaller than the thick portion. When the jig comes close and passes the thick portion, a first engaging member and a second engaging member are in a first relation where the first and second engaging members are separated from each other. When the jig reaches the thin portion, the first and second engaging members are in a second relation where the first and second engaging members are closer to one another than in the first relation. The member engaging unit is held between the first and second engaging members in the second relation and the member engaging unit is held by the jig during a predetermined process.

Abstract: A display member includes: an optical surface on which a predetermined process is performed and that includes a predetermined curvature; and a plurality of member engaging units linked to the optical surface. The member engaging units are aligned in a single line or parallel with one another and held by a jig. The display member is held through the jig during the predetermined process.

Abstract: Disclosed is a lens wherein characteristic direction of aberration and the like can be easily determined, and a lens processing method. A reference point of the characteristic direction of aberration and the like is clarified by providing a thin portion (103) of a flange section (102) with a mark portion (106), and the characteristic direction of aberration and the like can be easily and accurately determined. Furthermore, by not removing the whole flange section (102) in the thickness direction, the center position of the lens is prevented from shifting at the time of attaching the lens (100), and the processing portion of the lens (100) can be prevented from hitting a case and the like at the time of transferring the lens (100).

Abstract: It is an object of the present invention to provide a sheet-material foreign-matter detecting method and apparatus capable of securely detecting foreign matter attached to a sheet material. That is, the foreign matter attached to the sheet material is detected by applying light emitted from a light source to a sheet material, by picking up a light-source image reflected to the surface of the sheet material by image pickup means, and by judging a difference between brightnesses of a reflected image due to a difference between reflectances of the sheet material and the foreign matter.