Optical: systems and elements – Lens – With support
Patent
1999-04-23
2000-05-30
Epps, Georgia
Optical: systems and elements
Lens
With support
359822, 359823, G02B 702
Patent
active
060697547
ABSTRACT:
A device for focusing optical instruments, for example a telescope or microscope, includes a drive assembly having a fine and a coarse control knob. The knobs operatively connect with a drive shaft that extends transversely through a concave shaped support area of the drive. Seated in this support area is a tubular-shaped housing having an opening that fits over the drive shaft. Respective pairs of longitudinally spaced apart bearings then are attached to an inside wall of the housing to proximately align one each with ends of the housing shaft opening. A tubular-shaped drawtube then movably fits in the housing where a friction plate carried by a bottom portion of the drawtube engages the drive shaft. In an outer surface of the drawtube on each side of the friction plate is a longitudinal slot. Each slot has a bottom offset for a self-locating rail. Respective upper flat segments of the rails are in rolling contact with one each of the bearing pairs. During use an eyepiece of the optical instrument, for example, is inserted in a support collar carried inside an outer end of the drawtube. Lens of the eyepiece then are focused by rotation of the drive assembly knobs. The connecting drive shaft moves the drawtube and eyepiece to a position where the eyepiece lens display a distinct image.
REFERENCES:
patent: 4187020 (1980-02-01), Ishii et al.
patent: 5138947 (1992-08-01), Blading
Epps Georgia
Schmitt John L.
Seyrafi David
Starlight Instruments, Inc.
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