Light shielding structure
Patent 6733143 Issued on May 11, 2004. Estimated Expiration Date: 
November 28, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 28, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3910687 Sealing and bearing means by use of ferrofluid Patent #: 4598914 InventorsAssigneeApplicationNo. 09926649 filed on 11/28/2001US Classes:359/513, Sealing359/601GLARE OR UNWANTED LIGHT REDUCTIONExaminersPrimary: Robinson, Mark A.Attorney, Agent or FirmForeign Patent References
International ClassG02B 2700AbstractThere 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. | |
