Device for determining focused state of taking lens
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 23, 2004
Grant Date -
Aug 26, 2004
app pub date -
Dec 3, 2003
filing date -
Jun 4, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A beam splitter (24)for splitting light in a wavelength range of about 500 nm to about 600 nm is arranged in a relay optical system of a taking lens (12). A green light beam reflected from the beam splitter (24) is directed through a relay lens (R3) to a focusing state determination imaging unit (26). The imaging unit (26) comprises three imaging elements (A, B, C) for capturing the directed green light beam to determine the focusing state. Thus, a device for determining the focusing state of the taking lens is provided, in which the green light beam is separated as an object light for determining the focusing state from the object light entering the taking lens (12), so that the focusing state can be determined with high accuracy on the basis of the high-frequency components of the image signal generated by capturing the green light beam by means of the imaging elements (A, B, C) having different optical path lengths.
First Claim
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Cited Art Landscape
Patent Citation Ranking
- 11 Citation Count
- G02B Class
- 46.44 % this patent is cited more than
- 21 Age
