Thin schaukasten
Patent 4267489 Issued on May 12, 1981. Estimated Expiration Date: 
November 19, 1999. 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 19, 1999. 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 1868521 3796916 Automatic light intensity control for x-ray film viewer Patent #: 4118654 InventorAssigneeApplicationNo. 06/095303 filed on 11/19/1979US Classes:315/324, Plural discharge device loads315/210, Plural load device systems40/361, PHOTOGRAPHIC TRANSPARENCY VIEWER, E.G., X-RAY VIEWER40/367With internal light sourceExaminersPrimary: LaRoche, Eugene R.International ClassesF21V 9/08 (20060101)F21V 9/00 (20060101) G02B 27/02 (20060101) G09F 13/00 (20060101) F21S 8/00 (20060101) G09F 13/04 (20060101) Foreign Application Priority Data1978-12-01 JPAbstractA thin schaukasten which is composed of a diffusive transparent plate, a light homogenizing member, a fluorescent lamp and a reflection member and in which the light homogenizing member has a reflection pattern formed on a transparent support media to provide a distribution of transmission for preventing non-uniform luminous intensity on one surface of the diffusive transparent plate and the reflection member is disposed in such a manner as to reduce non-uniformity in luminous intensity on one surface of the light homogenizing member. A lighting circuit for the fluorescent lamp includes a frequency converter for preventing flicker when the fluorescent lamp is lit, and the lighting circuit is used in common to a plurality of fluorescent lamps. | |
