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Lens device

  • US 7,773,144 B2
  • Filed: 09/07/2005
  • Issued: 08/10/2010
  • Est. Priority Date: 09/15/2004
  • Status: Expired due to Fees
First Claim
Patent Images

1. A lens device, comprising:

  • a photographic lens having an optical axis;

    a half mirror on the optical axis, the photographic lens being on a light incident side of the half mirror;

    wherein the lens device is connected to a first camera on a light transmitting side of the half mirror and connected to a second camera on a light reflecting side of the half mirror, and object light transmitted through the photographic lens is divided by the half mirror toward the first camera and the second camera; and

    an optical system on the optical axis, the optical system being located on the light transmitting side of the half mirror;

    a mirror moving unit that retracts the half mirror away from a position on the optical axis and advances the half mirror toward the position on the optical axis; and

    an optical system moving unit that moves the optical system along the optical axis in accordance with a movement of the half mirror, the optical system moving unit correcting defocus attributable to both the retracting and the advancing of the half mirror.

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