Optical: systems and elements – Lens – With support
Patent
1993-08-26
1995-10-03
Ben, Loha
Optical: systems and elements
Lens
With support
359830, 285414, G02B 702
Patent
active
054557151
ABSTRACT:
Compact and lightweight portable collimator for adjusting an optical system of a video camera is disclosed, the collimator comprises a chart piece holding a chart pattern for producing an image of the chart pattern placed at a focal point of a convex lens which converts a light from the chart pattern into a beam of parallel light and projecting the beam toward the video camera, a cylinder for housing the chart piece and the convex lens, and coupling device rotatably coupling the cylinder to a lens barrel of the video camera so that an orientation of the chart pattern can be changed and the optical system of the video camera can be adjusted to a distance of infinity. The chart piece may be made replaceable so as to place the chart pattern within a focal length of the convex lens to optically synthesize an object placed closer than the infinite distance with respect to an objective lens of the video camera.
REFERENCES:
patent: 4291944 (1981-09-01), Nomura
patent: 4740058 (1988-04-01), Hori et al.
Ben Loha
Meller Michael N.
Phan James
Victor Company of Japan Ltd.
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