Title:
SPOTLIGHT
Document Type and Number:
Japanese Patent JP3599727
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a new spotlight enabling easy focus adjustment and zoom adjustment without causing a change in the position of image formation even if zoom adjustment is performed after focus adjustment.
SOLUTION: When a driving shaft 10 is rotated by operation of a zoom adjusting handle 5, a lens 4a moves back and forth in accordance with an unequal pitch P1 of a first screw part 15, and a lens 4b moves back and forth in accordance with an equal pitch P2 of a second screw part 16. Clearances between the lenses 4a-4c are thus changed to perform zoom adjustment. Focus adjustment performed by a focus mechanism b is not affected by the change in the clearances between the lenses.
Inventors:
Tanaka Yomichi
Tsutomu Ishisone
Tsutomu Ishisone
Application Number:
JP2002262832A
Publication Date:
December 08, 2004
Filing Date:
September 09, 2002
Export Citation:
Assignee:
Marumo Electric Co., Ltd.
International Classes:
F21S8/00; F21S10/00; F21V14/00; F21V14/06; F21V17/02; F21S2/00; G02B7/10; F21W131/406; F21Y101/00; (IPC1-7): F21S2/00; F21S10/00; F21V14/00
Domestic Patent References:
| JP563901A | ||||
| JP2160301A | ||||
| JP2001519542A | ||||
| JP3121602U | ||||
| JP59204U | ||||
| JP236104U |
Attorney, Agent or Firm:
Sadayuki Hosoi
Mitsuo Chonan
Ishiwatari Eibo
Mitsuo Chonan
Ishiwatari Eibo
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