OPTICAL SCANNER, AND DISTANCE MEASURING DEVICE

• Main Authors: TANAKA TOYOKI, NISHIYAMA TAKAHIKO, KIMURA YUJI, YAMADA KENSUKE
• Format: Patent
• Language: English; Japanese
• Published: 13.09.2023
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

To provide an optical scanner that makes variable the interval between a plurality of scan lines formed by scanning light.SOLUTION: An optical scanner 120 has: a first driver 5 that drives a light reflection surface 51 around a first axis A1 at a first frequency fv to scan light L1 reflected on the light reflection surface in a direction intersecting the first axis A1; a second driver 10 that supports the first driver 5, and drives an angle plate around a second axis A2 at a second frequency fh to scan the light L1 in a direction intersecting the second axis A2; and a control unit 140 that controls the drive of the second driver 10. When the number of scan lines Li formed by light L2 scanned in a direction intersecting the first axis A1 in one driving cycle of the second driver 10 is defined as N, the number of scan lines formed by light scanned in a direction intersecting the first axis A1 in one driving cycle of the first driver 5 as M, and a constant as α, fh=M×fv/(N+α) and 0<|α|<1 are satisfied. The control unit 140 changes the constant to change the second frequency fh.SELECTED DRAWING: Figure 8 【課題】走査光によって形成される複数走査線同士の間隔を可変とする光走査装置を提供。【解決手段】光走査装置１２０は、第１周波数ｆｖで第１軸Ａ１周りに光反射面５１を駆動することにより反射された光Ｌ１を第１軸Ａ１と交差する方向に走査させる第１駆動体５と、第１駆動体５を支持し第２周波数ｆｈで第２軸Ａ２周りに駆動することにより光Ｌ１を第２軸Ａ２と交差する方向に走査させる第２駆動体１０と、第２駆動体１０の駆動を制御する制御部１４０とを有し、第２駆動体１０の一駆動周期中に第１軸Ａ１と交差する方向に走査される光Ｌ２によって形成される走査線Ｌｉの数をＮ、第１駆動体５の一駆動周期中に第１軸Ａ１と交差する方向に走査される光によって形成される走査線の数をＭ、定数をαとした時、ｆｈ＝Ｍ×ｆｖ／（Ｎ＋α）であって、０＜｜α｜＜１であり、制御部１４０は、定数を変更することにより第２周波数ｆｈを変化させる。【選択図】図８