WAVELENGTH SELECTION SWITCH, SPECTROSCOPE, SPECTROMETER AND WAVELENGTH SELECTION SWITCH USING SAME

Title:

WAVELENGTH SELECTION SWITCH, SPECTROSCOPE, SPECTROMETER AND WAVELENGTH SELECTION SWITCH USING SAME

Document Type and Number:

WIPO Patent Application WO/2012/093719

Kind Code:

A1

Abstract:

Provided are a spectrometer, etc. which show sufficiently small change in dispersion characteristics even when temperature variation is produced. The spectrometer comprises, in sequence in the forward direction of incidence of a light ray, a first group of dispersion elements and a second group of dispersion elements. Δθ4 and Δθ5 are substantially equal when the exit angle of a light ray in the forward direction from the first group of dispersion elements at a first temperature (T1) is θ4, the exit angleof a light ray in the forward direction from the first group of dispersion elements at a second temperature (T2) different from the first temperature (T1) is θ'4, the difference between the exit angles (θ'4－θ4) is Δθ4, the light ray in the forward direction at the first temperature (T1) being a light ray following an optical path that exits from the second group of dispersion elements, the exit angle of a light ray in the reverse direction from the second group of dispersion elements at the second temperature (T2) is θ"5, the angle of incidence of a light ray in the forward direction to the second group of dispersion elements at the first temperature (T1) is θ5, and the difference (θ"5－θ5) between the exit angle and the incidence angle is Δθ5.

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Inventors:

YOSHIDA TAKEHIRO (JP)
OKAMURA TOSHIRO (JP)
MATSUMOTO KOJI (JP)
WATANABE SATOSHI (JP)

Application Number:

PCT/JP2012/050170

Publication Date:

July 12, 2012

Filing Date:

January 06, 2012

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Assignee:

OLYMPUS CORP (JP)
YOSHIDA TAKEHIRO (JP)
OKAMURA TOSHIRO (JP)
MATSUMOTO KOJI (JP)
WATANABE SATOSHI (JP)

International Classes:

G01J3/18

Foreign References:

JP2010156680A

2010-07-15

Attorney, Agent or Firm:

SAITO Keisuke et al. (JP)
Keisuke Saito (JP)

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Claims:

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