Abstract: A cleaning composition for a glass hard disk substrate has high detergency and can reduce the deterioration of the surface roughness of a substrate. In an embodiment, the present disclosure relates to a cleaning composition for a glass hard disk substrate, which contains an amine (component A) expressed by the formula (I) and a surface active agent (component B) expressed by the formula (II).

Abstract: A cleaning composition for a glass hard disk substrate has high detergency and can reduce the deterioration of the surface roughness of a substrate. In an embodiment, the present disclosure relates to a cleaning composition for a glass hard disk substrate, which contains an amine (component A) expressed by the formula (I) and a surface active agent (component B) expressed by the formula (II).

Abstract: An earthquake-proof latch mechanism includes a case body, a hook member which is swingably supported on the case body, and a pendulum member which is vibratably suspended and supported on the case body. The hook member includes a hook on one side of a swinging shaft and a pendulum engagement portion on the other side of the swing shaft. A through hole is formed in the pendulum engagement portion. The pendulum member is disposed to penetrate the through hole, and a peripheral surface of the pendulum member facing the through hole is formed into a tapered shape. The peripheral surface pushes up the inner periphery of the through hole to swing the hook member when the pendulum member vibrates. Thus, the earthquake-proof latch mechanism is made compact.

Abstract: To provide a method for cleaning a glass substrate in which aggravation of surface roughness of the glass substrate in alkali cleaning is suppressed and cleaning performance is improved. In one or a plurality of embodiments, this invention relates to a method for cleaning a glass substrate, including bringing a detergent composition into contact with a glass substrate to be cleaned. The detergent composition containing an amine including 1 to 10 nitrogen atoms and an inorganic alkali, the amine content is in a range of 5.00 mass % to 70.00 mass % relative to the total mass of components of the detergent composition other than water, the glass substrate to be cleaned is a crystallized glass substrate, and a pH of the detergent composition during cleaning is in a range of 9.00 to 11.50.

Abstract: An earthquake-proof latch mechanism includes a case body, a hook member which is swingably supported on the case body, and a pendulum member which is vibratably suspended and supported on the case body. The hook member includes a hook on one side of a swinging shaft and a pendulum engagement portion on the other side of the swing shaft. A through hole is formed in the pendulum engagement portion. The pendulum member is disposed to penetrate the through hole, and a peripheral surface of the pendulum member facing the through hole is formed into a tapered shape. The peripheral surface pushes up the inner periphery of the through hole to swing the hook member when the pendulum member vibrates. Thus, the earthquake-proof latch mechanism is made compact.

Abstract: Provided is a method for producing a glass hard disk substrate, including steps of polishing a glass substrate with an acidic polishing liquid; and subjecting the obtained substrate to alkali cleaning. This method can inhibit degradation of surface roughness of the glass substrate in the alkali cleaning step while maintaining a polishing rate in the polishing step, and further can improve cleanliness. The method for producing a glass hard disk substrate includes the following steps (1) and (2): (1) polishing a glass substrate to be polished using a polishing composition of pH 1.0-4.2 that contains a polyvalent amine compound having 2 to 10 nitrogen atoms in the molecule; and (2) cleaning the substrate obtained in the step (1) using a cleaner composition of pH 8.0-13.0.