Patent ID: 8242444

Claim:
An optical device for viewing an image comprising: two optical channels positioned adjacent one another, each optical channel including an image detector assembly and a associated objective lens assembly spaced by a respective distance from the image detector assembly, wherein the objective lens assembly includes an objective lens and the image detector assembly includes an image detector; and each objective lens assembly including a translation surface that is positioned to face a translation surface of its associated image detector assembly; and a resilient member positioned to bias the translation surface of each image detector assembly toward a translation surface of its associated objective lens assembly, wherein upon translation of each objective lens with respect to its associated image detector, the resilient member continuously biases the translation surface of each image detector assembly toward the translation surface of the associated objective lens such that a longitudinal axis of each image detector remains substantially parallel to a longitudinal axis of its associated objective lens as each image detector translates with respect to its associated objective lens assembly; and further comprising a ball bearing positioned between the image detector assemblies, wherein the resilient member is configured to bias the ball bearing in a direction biasing the translation surface of each image detector assembly toward the translation surface of its associated objective lens; and a pocket defined between the image detector assemblies, wherein the ball bearing and the resilient member are positioned within the pocket.