公开(公告)号：US20210191000A1

公开(公告)日：2021-06-24

申请号：US16723184

申请日：2019-12-20

Applicant: Mitutoyo Corporation

Inventor： Joseph Daniel TOBIASON

IPC: G02B3/14 ,  G02B3/00

Abstract: A tunable acoustic gradient (TAG) lens includes a lens casing in which a controllable acoustic wave generating element is arranged and that surrounds a casing cavity in which an operational volume of a refractive fluid is contained. The lens casing includes a first case end portion comprising a window mounted along an optical path, and a second case end portion comprising a mirror mounted along the optical path. The TAG lens is configured to enable light to pass through the window of the TAG lens to enter the TAG lens and make a first pass through the operational volume of the refractive fluid and be reflected by the mirror of the TAG lens and make a second pass back through the operational volume of the refractive fluid and pass back out through the window of the TAG lens to exit the TAG lens and continue along the optical path.

公开(公告)号：US20180180453A1

公开(公告)日：2018-06-28

申请号：US15391243

申请日：2016-12-27

Applicant: MITUTOYO CORPORATION

Inventor： Akihide KIMURA ,  Joseph Daniel TOBIASON

IPC: G01D5/347

CPC classification number: G01D5/34746

Abstract: A detection head movable relative to a scale detects diffracted light and outputs a detection result. The diffracted light is diffracted by an incremental pattern. A signal processing unit calculates a relative displacement between the scale and the detection head. The detection head includes: a light source emitting the light to the scale; and a detection unit including a light-receiving unit in which a plurality of light-receiving elements that output a detection signal are arranged. The number of the plurality of light-receiving elements is an even number. A period of the arrangement of the plurality of light-receiving elements is an odd-number multiple of a fundamental period. The fundamental period is a period of interference fringes formed on the light-receiving unit by +1st and −1st order diffracted lights. A width of the light-receiving element is not equal to an integral multiple of the fundamental period.

公开(公告)号：US20180299300A1

公开(公告)日：2018-10-18

申请号：US16012064

申请日：2018-06-19

Applicant: MITUTOYO CORPORATION

Inventor： Akihide KIMURA ,  Joseph Daniel TOBIASON

IPC: G01D5/347

CPC classification number: G01D5/34746 ,  G01D5/34715 ,  G01D5/38

Abstract: A detection head movable relative to a scale detects diffracted light and outputs a detection result. The diffracted light is diffracted by an incremental pattern. A signal processing unit calculates a relative displacement between the scale and the detection head. The detection head includes: a light source emitting the light to the scale; and a detection unit including a light-receiving unit receiving the diffracted light through an optical element, in which the light-receiving elements outputting detection signals are periodically arranged with a predetermined period. The number of the plurality of light-receiving elements is an even number. The predetermined period is a value obtained by multiplying a fundamental period by an odd-number. The fundamental period is a period of interference fringes formed on the light-receiving unit by +1st and −1st order diffracted lights. A width of the light-receiving element is not equal to an integral multiple of the fundamental period.