FIRST OPTICAL SYSTEM, SPECTROSCOPE AND OPTICAL DEVICE

• Main Authors: KANEKO TSUTOMU, KOJIMA MANABU
• Format: Patent
• Language: English; Japanese
• Published: 09.02.2023
• Subjects: COLORIMETRY; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; PHYSICS; RADIATION PYROMETRY; TESTING

To provide a first optical system which facilitates work for attaching a diffraction grating to a drive device.SOLUTION: A first optical system 10 according to the present disclosure comprises a first lens 111 for guiding light L0 to a diffraction grating 3, a second lens 112 for parallelizing first diffraction light L1 condensed on a first focal point f1 through the first lens 111, a pair of first mirrors 12 and 13 for returning the first diffraction light L1 to the diffraction grating 3, a third lens 113 for condensing the first diffraction light L1 at a second focal point f2, and a fourth lens 114 for guiding the first diffraction light L1 condensed through the third lens 113 to the diffraction grating 3. The first lens 111 and the fourth lens 114 have almost the same first focal distance with each other. The second lens 112 and the third lens 113 have almost the same second focal distance with each other. First distance from the first focal point f1 to the second focal point f2 along an optical path is defined by a first predetermined condition.SELECTED DRAWING: Figure 1 【課題】回折格子を駆動装置に取り付けるときの作業が容易になる第１光学系を提供する。【解決手段】本開示に係る第１光学系１０は、光Ｌ０を回折格子３へと導く第１レンズ１１１と、第１レンズ１１１により第１焦点ｆ１に集光された第１回折光Ｌ１を平行光化する第２レンズ１１２と、第１回折光Ｌ１を回折格子３へと折り返す一対の第１ミラー１２、１３と、第１回折光Ｌ１を第２焦点ｆ２に集光する第３レンズ１１３と、第３レンズ１１３により集光された第１回折光Ｌ１を回折格子３へと導く第４レンズ１１４と、を備え、第１レンズ１１１と第４レンズ１１４とは、互いに略同一の第１焦点距離を有し、第２レンズ１１２と第３レンズ１１３とは、互いに略同一の第２焦点距離を有し、第１焦点ｆ１から第２焦点ｆ２までの光路に沿った第１距離は、第１所定条件により定まる。【選択図】図１