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Patent Searching and Data


Title:
MULTISTAGE EXTENSION LENS BARREL
Document Type and Number:
Japanese Patent JP3344193
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a multistage extension lens barrel which is small in external lens barrel diameter and thin in thickness.
SOLUTION: A 1st straight moving cylinder 20 moves straight along an optical axis AX. A 1st rotary cylinder 30 is positioned on the internal-diameter side of the 1st straight moving cylinder 20 and moves along the optical axis AX integrally with the 1st straight moving cylinder 20 while rotating. A 2nd rotary cylinder 40 is positioned on the internal-diameter side of the 1st straight moving cylinder 20 and extended by the 1st straight moving cylinder 209 and 1st rotary cylinder 30. Further, the 2nd rotary cylinder 40 has an internal diameter nearly equal to that of the 1st rotary cylinder 30 and has a straight movement groove 40a that the 1st rotary cylinder 30 enters along the optical axis AX.


Inventors:
Uno, Tetsuya
Application Number:
JP1598596A
Publication Date:
November 11, 2002
Filing Date:
January 31, 1996
Export Citation:
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Assignee:
MINOLTA CO LTD
International Classes:
G02B7/04; G02B7/10; G02B7/02; (IPC1-7): G02B7/04; G02B7/02
Attorney, Agent or Firm:
佐野 静夫