Title:
IMAGE ACQUISITION DEVICE AND FOCUSING METHOD FOR IMAGE ACQUISITION DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/174920
Kind Code:
A1
Abstract:
Using an optical-path-difference creation member (21), this image acquisition device (M) is capable of forming an optical-path-length difference in second image light without splitting light travelling along a second optical path (L2). The amount of light needed in said second optical path (L2) to obtain focal-position information is thus reduced, ensuring that there is enough light for a first imaging device (18) to take an image. On the imaging surface (20a) of a second imaging device (20), the optical-path-difference creation member (21) in this image acquisition device (M) forms a first incidence region (24A) upon which second image light that exhibits an optical-path difference is incident and a second incidence region (24B) upon which second image light that exhibits no optical-path difference is incident. A second image to use in focusing-information analysis can thus be selected by a focusing computation unit (37) as circumstances require, allowing focusing information to be computed with high precision.
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Inventors:
OISHI HIDESHI (JP)
IWASE FUMIO (JP)
OKUGAWA MASATOSHI (JP)
IWASE FUMIO (JP)
OKUGAWA MASATOSHI (JP)
Application Number:
PCT/JP2014/055988
Publication Date:
October 30, 2014
Filing Date:
March 07, 2014
Export Citation:
Assignee:
HAMAMATSU PHOTONICS KK (JP)
International Classes:
G02B21/36; G02B7/28; G02B7/36
Domestic Patent References:
| WO2005114293A1 | 2005-12-01 |
Foreign References:
| JP2012073285A | 2012-04-12 | |||
| JP2012212155A | 2012-11-01 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)
Yoshiki Hasegawa (JP)
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