Lens barrel, photographic apparatus, and optical apparatus

Details Lens barrel, photographic apparatus, and optical apparatus Lens barrel, photographic apparatus, and optical apparatus

2006-09-05

2006-09-05

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S702000, C396S349000

Reexamination Certificate

active

07102831

ABSTRACT:
A lens barrel has its collapsed length that can be further decreased by removing unnecessary space and bringing lens groups close to each other and a photographic apparatus incorporates the lens barrel. When the lens barrel is collapsed, at least a fourth lens group is retracted from a photographic optical axis by an advance/retract mechanism. In that case, a first lens group and third lens group are aligned along the optical axis and stuffed into the lens barrel, the fourth lens group is placed on the top, bottom, right, or left side of these lenses, and a second lens group is placed on the top, bottom, right, or left side of the first and third lens groups. This reduces the length of the lens barrel. During extension, the second and fourth lens groups are advanced onto the photographic optical axis by the advance/retract mechanism to extend the lens barrel greatly.

REFERENCES:
patent: 5570149 (1996-10-01), Wakabayashi et al.
patent: 5734937 (1998-03-01), Katoh et al.
patent: 6008954 (1999-12-01), Shintani et al.
patent: 6853499 (2005-02-01), Iwasaki
patent: 2003-295031 (2003-10-01), None
Discover Originality High Technology Grand Prix 17thExcellent Research Paper, Special Prize for the 70thAnniversary of the birth of Nihon Kogyo Shimbun, “Technique Used in Super-slim Digital Camera OptioS”, Mr. Hiroshi Nomura, et al.

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