Abstract: In a sealing device having a combination of a seal lip and a seal flange which slidably come into contact with each other, and having a thread groove in an axial end face of the seal flange, the seal lip installed to a not-rotating housing side slidably comes into contact with an axial end face of the seal flange in a rotating shaft side, and the thread groove achieves a fluid pumping action at the rotating time in an axial end face of the seal flange. The thread groove has an inner peripheral side inclined surface as a part of an inner surface thereof, and an angle formed between an inner peripheral surface of a leading end portion of the seal lip and the inner peripheral side inclined surface is set to a range of 0 degree±3 degrees. The sealing device can suppress generation of a static leakage.

Abstract: In a sealing device having a combination of a seal lip and a seal flange which slidably come into contact with each other, and having a thread groove in an axial end face of the seal flange, the seal lip installed to a not-rotating housing side slidably comes into contact with an axial end face of the seal flange in a rotating shaft side, and the thread groove achieves a fluid pumping action at the rotating time in an axial end face of the seal flange. The thread groove has an inner peripheral side inclined surface as a part of an inner surface thereof, and an angle formed between an inner peripheral surface of a leading end portion of the seal lip and the inner peripheral side inclined surface is set to a range of 0 degree ±3 degrees. The sealing device can suppress generation of a static leakage.

Abstract: A sealing device includes a side lip contacting with a surface angled to the axis. To optimize the cross sectional shape of the side lip, T1/T3 is set to not less than 0.5 and less than 0.8 and L2/L1 is set to 0.2 to 0.4, where the thickness of the lip end (5c) of the side lip (5) is T1, the thickness of the lip base (5a) is T3, the length of the lip end (5c) is L1, and the length of the lip base (5a) is L2. Further, in a sealing device which includes a side lip (5) contacting with a surface angled to the axis over its contact width, the maximum value of the surface pressure in the side lip (5) is set at the most leading end (5d) of the lip.

Abstract: A sealing device with a side lip contacting with a surface angled relative to its axis in which the cross sectional shape of the side lip is optimized. Where the thickness of the tip end (5c) of the side lip (5) is T1, the thickness of the base (5a) of the lip (5) is T3, the length of the tip end (5c) is L1, and the length of the base (5a) is L2, T1/T3 is set to be not less than 0.7 and less than 0.8 and L2/L1 is set to be not less than 0.5 and less than 0.6.

Abstract: A magnetic fluid seal device that increases a permissible value of eccentricity for two members to improve sealability and decreases a variation of quality by injecting a magnetic fluid before assembling of parts, that saves structural members to achieve thinning, and that is easy to produce. An annular magnet 3 is buoyantly supported by the magnetic fluid 4 and 5 retained, and the space between a housing 1 and a shaft 2 is sealed by the annular magnet 3 and magnetic fluid 4 and 5.

Abstract: A magnetic fluid seal device that increases a permissible value of eccentricity for two members to improve sealability and decreases a variation of quality by injecting a magnetic fluid before assembling of parts, that saves structural members to achieve thinning, and that is easy to produce. An annular magnet 3 is buoyantly supported by the magnetic fluid 4 and 5 retained, and the space between a housing 1 and a shaft 2 is sealed by the annular magnet 3 and magnetic fluid 4 and 5.

Abstract: A high-performance magnetic fluid sealer which maintains light-shielding property even when an interval change of a gap is large and a method for easily mounting a magnetic fluid sealer. A pair of annular magnets are supported by levitation from a lens barrel by magnetic levitation force which a magnetic fluid imparts in a fitting groove in the inner peripheral face of a lens barrel. Therefore, even when the lens barrel is greatly eccentric to the lens barrel, the pair of annular magnets move radially so as to keep a constant gap from the lens barrel with the magnetic fluid.

Abstract: There is provided a light shielding apparatus with a light shielding seal 1 that reduces a sliding resistance and, at the same time, improves light shielding property and realizes saving of a space. There is provided a light shielding structure that is provided between a plurality of members 13 and 14, which are arranged to be able to move relatively to each other spaced a predetermined distance apart, and is capable of preventing light from entering from a gap to be formed between these plurality of members 13 and 14, having magnetic force generating means 2 and 3 that are disposed in any one of the above-mentioned plurality of members 13 and 14 and magnetic fluid 4 which is magnetically held by the magnetic force generating means 2 and 3 and contacts the other member and shielding a gap, which is formed between the above-mentioned plurality of members 13 and 14, by the above-mentioned magnetic fluid 4.

Abstract: Disclosed is a high-performance magnetic fluid sealer which maintains light-shielding property even when an interval change of a gap is large and a method for easily mounting a magnetic fluid sealer. A pair of annular magnets (2, 3) are supported by levitation from a lens barrel (6) by magnetic levitation force which a magnetic fluid (4) imparts in a fitting groove in the inner peripheral face of a lens barrel (5). Therefore, even when the lens barrel (6) is greatly eccentric to the lens barrel (5), the pair of annular magnets (2, 3) move radially so as to keep a constant gap from the lens barrel (6) with the magnetic fluid (4).