Lens device

• US 20060055810A1
• Filed: 09/07/2005
• Published: 03/16/2006
• Est. Priority Date: 09/15/2004
• Status: Active Grant

• Current Assignee: Fujinon Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujinon Corporation (Fujifilm Holdings Corporation)
• Inventors: Tanaka, Minoru
• Granted Patent: US 7,773,144 B2
• Time in Patent Office: Days
• US Class Current: 348/335
• CPC Class Codes: G02B 13/0095 Relay lenses or rod lenses in instruments for viewing the inside of hollow bodies G02B23/2446
• CPC Class Codes: G02B 27/1013 for colour or multispectral image sensors, e.g. splitting an image into monochromatic image components on respective sensors spectral imaging systems G01J
• CPC Class Codes: G02B 27/144 using partially transparent surfaces without spectral selectivity G02B27/147 takes precedence
• CPC Class Codes: H04N 23/11 for generating image signals from visible and infrared light wavelengths

Abstract

A lens device, in which object light is branched by a half mirror after passing through a photographic lens to allow photographing with two photographing means and in which the half mirror can be retracted from the optical axis to obtain a clear image using one of the photographing means, is provided. The half mirror in the lens device is provided between a front-side relay lens and a rear-side relay lens, and is provided such that the half mirror can be retracted away from an optical axis of the photographic lens and advanced toward from the optical axis. The rear-side relay lens is moved along the optical axis to a position in accordance with the retracting of advancing of the half mirror.

Claims

1. A lens device comprising:

a photographic lens;

a half mirror lens on an optical axis of the photographic lens, wherein the lens device is connected to a first camera on a transmitting side of the half mirror and connected to a second camera on a 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;

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; and

an optical system moving unit that moves the optical system back and forth along the optical axis in accordance with the retracting and advancing of the half mirror.

2. The lens device according to claim 1, wherein the optical system is a relay lens disposed on the transmitting side of the half mirror.

3. The lens device according to claim 1, wherein the first camera is a television camera for photographing with visible light, and the second camera is an infrared camera for photographing with infrared light.