Multi-stage extension type zoom lens barrel

Details Multi-stage extension type zoom lens barrel Multi-stage extension type zoom lens barrel

1998-10-22

2000-04-25

Epps, Georgia

Optical: systems and elements

Lens

With support

819826, G02B 702

Patent

active

06055116&

ABSTRACT:
A multi-stage extension type zoom lens barrel includes a first rotational feed barrel rotatably connected to a stationary barrel; a first linear movement barrel disposed in, and rotatably connected to, the first rotational feed barrel without relatively moving in the optical axis direction; a second rotational feed barrel disposed in, and rotatably connected to, the first linear movement barrel so as to move in the optical axis direction relative to the first linear movement barrel upon rotating; a rotation transmission barrel which can be detachably inserted between the first rotational feed barrel and the first linear movement barrel from the front thereof; a rotation transmission groove and a projection which connects the rotation transmission barrel and the first rotational feed barrel so as to relatively move in the optical axis direction without relatively rotating; connection members provided at the front ends of the rotation transmission barrel and the second rotational feed barrel; and a connection holding decoration ring detachably attached to the front ends of the second rotational feed barrel and the rotation transmission barrel via a predetermined amount of deformation, so as to hold the connection of the barrels.

REFERENCES:
patent: 3484159 (1969-12-01), Roman et al.
patent: 5737644 (1998-04-01), Nomura et al.
patent: 5742850 (1998-04-01), Nomura et al.
patent: 5748388 (1998-05-01), Nomura et al.
patent: 5765048 (1998-06-01), Nomura et al.
patent: 5884105 (1999-03-01), Nomura et al.
patent: 5900992 (1999-03-01), Kodaka et al.

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