LENS BARREL AND PROJECTION LENS

LENS BARREL AND PROJECTION LENS

PROBLEM TO BE SOLVED: To provide a lens barrel and a projection lens capable of easily and effectively reducing influence of optical performance deterioration due to change in a direction of fitting clearance between a fixed cylinder and a cam ring, at a zoom end.SOLUTION: The lens barrel includes:...

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Hauptverfasser: MIGITA HIROTAKE, TATSUMI TAKAHIRO
Format: Patent
Sprache:eng
Schlagworte:
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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creator MIGITA HIROTAKE
TATSUMI TAKAHIRO
description PROBLEM TO BE SOLVED: To provide a lens barrel and a projection lens capable of easily and effectively reducing influence of optical performance deterioration due to change in a direction of fitting clearance between a fixed cylinder and a cam ring, at a zoom end.SOLUTION: The lens barrel includes: a fixed cylinder 2; and a cam ring 3 fitted to the fixed cylinder 2 so as to be rotatable around an optical axis. The fixed cylinder 2 includes a first and second stopper pins 22 and 23 located at positions separated from each other by 180° in a circumferential direction. The cam ring 3 includes a first rotation regulation part 34 and a second rotation regulation part 35. The first rotation regulation part 34 abuts on the first stopper pin 22 when the cam ring 3 rotates in one direction, and the second rotation regulation part 35 abuts on the second stopper pin 23 when the cam ring 3 rotates in the other direction.
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The fixed cylinder 2 includes a first and second stopper pins 22 and 23 located at positions separated from each other by 180° in a circumferential direction. The cam ring 3 includes a first rotation regulation part 34 and a second rotation regulation part 35. 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The fixed cylinder 2 includes a first and second stopper pins 22 and 23 located at positions separated from each other by 180° in a circumferential direction. The cam ring 3 includes a first rotation regulation part 34 and a second rotation regulation part 35. The first rotation regulation part 34 abuts on the first stopper pin 22 when the cam ring 3 rotates in one direction, and the second rotation regulation part 35 abuts on the second stopper pin 23 when the cam ring 3 rotates in the other direction.</abstract><oa>free_for_read</oa></addata></record>
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subjects OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
title LENS BARREL AND PROJECTION LENS
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