Optical: systems and elements – Compound lens system – Telescope
Patent
1998-08-10
2000-08-22
Henry, Jon
Optical: systems and elements
Compound lens system
Telescope
359826, 74 8915, G02B 2306, G02B 702, F16H 2702
Patent
active
061081299
ABSTRACT:
A secondary focuser which facilitates minute and measured incremental changes of the focal length within a limited travel distance is disclosed. The secondary focuser is used to micro focus telescopes for astro photography. A method of constructing the micro focuser comprises the following steps: constructing a housing having an open central axis therethrough; slidably disposing a travelling inner sleeve within the housing; and, mounting and arranging a micrometer head on the housing. When the micrometer head is turned the inner sleeve travels within the housing finely adjusting an axial length therethrough. In a preferred aspect of the invention the micrometer head is configured to turn about an axis generally perpendicular to the central axis through the housing, pivoting a rocker arm so that when one end portion of the rocker arm is moved in a radial direction, the other end moves in a direction generally parallel to the central axis, thereby longitudinally shifting the travelling sleeve.
REFERENCES:
patent: 2245405 (1941-06-01), Langsner
patent: 2489579 (1949-11-01), Hillman
patent: 2564704 (1951-08-01), Martling
patent: 5123723 (1992-06-01), Chesnutt et al.
Gallinger G. F.
Henry Jon
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