Title:
光学分析装置
Document Type and Number:
Japanese Patent JP6500474
Kind Code:
B2
Abstract:
Provided is an optical analyzer for performing a feedback control on the amount of light emitted from an LED as a light source, in which the configuration of an optical system is made simple and the degree of freedom in optical system arrangement is secured. An optical member 2 for focusing most of light while discharging part of the light as unfocused light is provided on an optical path from a light casting unit 1 to a sample cell 3. The optical member 2 can be achieved with a simple configuration, for example, two ball lenses spaced apart by a predetermined distance from each other. The light focused by the optical member 2 is cast as measurement light into the sample cell 3. Meanwhile, a second photodetector 5 is arranged at a position where the unfocused light reaches. The second photodetector 5 generates a detection signal in accordance with the amount of light that has entered the second photodetector 5 as monitored light, and a drive current to be supplied to an LED is controlled through a drive current controlling unit 6 and a current source 7 such that the amount of light is maintained at a fixed level.
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Inventors:
Yui Nagai
Keisuke Ogawa
Masato Watanabe
Jingu Kummiko
Fujiwara Rigo
Tomoyuki Yamazaki
Keisuke Ogawa
Masato Watanabe
Jingu Kummiko
Fujiwara Rigo
Tomoyuki Yamazaki
Application Number:
JP2015023173A
Publication Date:
April 17, 2019
Filing Date:
February 09, 2015
Export Citation:
Assignee:
SHIMADZU CORPORATION
International Classes:
G01N21/01; G01N21/27; H05B44/00
Domestic Patent References:
| JP2011237384A | ||||
| JP2007027523A | ||||
| JP2001343563A |
Foreign References:
| US20120104225 |
Attorney, Agent or Firm:
Kyoto International Patent Office