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EP-4737945-A1 - DISTANCE MEASUREMENT DEVICE

EP4737945A1EP 4737945 A1EP4737945 A1EP 4737945A1EP-4737945-A1

Abstract

A distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object includes a fixed portion, a rotation portion configured to rotate with respect to the fixed portion, a lipophilic lid portion configured to cover the rotation portion, and a bearing connected to the rotation portion.

Inventors

  • NISHIYAMA AKIHIRO
  • KAWABUCHI KENICHIRO
  • KANO YASUYUKI
  • KAMA HIROFUMI
  • ASAHI HITOSHI
  • HARUGUCHI TAKASHI
  • INOUE MASAOMI
  • MIMASA JIRO
  • HIRUMA TAKAYUKI
  • YOSHINAKA HIDEKI

Assignees

  • Panasonic Intellectual Property Management Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240627

Claims (12)

  1. A distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object, the distance measurement device comprising: a fixed portion; a rotation portion configured to rotate with respect to the fixed portion; a lipophilic lid portion configured to cover the rotation portion; and a bearing connected to the rotation portion.
  2. A distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object, the distance measurement device comprising: a fixed portion; a rotation portion configured to rotate with respect to the fixed portion; and a bearing connected to the rotation portion, wherein the rotation portion includes a rotation fin configured to rotate together with the rotation portion and generate an airflow.
  3. A distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object, the distance measurement device comprising: a fixed portion; a rotation portion configured to rotate with respect to the fixed portion; and a bearing that includes an outer ring and an inner ring and that is connected to the rotation portion, wherein a first surface of the bearing has a labyrinth structure.
  4. The distance measurement device according to claim 1, wherein the rotation portion includes a rotation fin configured to rotate together with the rotation portion and generate an airflow.
  5. The distance measurement device according to claim 1, wherein the bearing includes an outer ring and an inner ring, and wherein a first surface of the bearing has a labyrinth structure.
  6. The distance measurement device according to claim 2, wherein the bearing includes an outer ring and an inner ring, and wherein a first surface of the bearing has a labyrinth structure.
  7. The distance measurement device according to claim 2, wherein the fixed portion includes a fixed support base configured to support the bearing and having a second hole in a part thereof.
  8. The distance measurement device according to claim 2 further comprising a sheet provided between the fixed portion and the rotation portion.
  9. The distance measurement device according to claim 2, wherein the fixed portion includes a lens cover at least a part of which is provided between the bearing and the rotation portion.
  10. The distance measurement device according to claim 2 further comprising an outer cover portion configured to cover the rotation portion, wherein the rotation portion includes a top surface lid on a top surface of the rotation portion.
  11. The distance measurement device according to claim 2, wherein the rotation portion has a substantially cylindrical shape and is partially open, and wherein the rotation portion further includes a lid portion configured to close an open surface of the rotation portion.
  12. The distance measurement device according to claim 3 further comprising an adsorption filter provided between the fixed portion and the rotation portion and configured to adsorb oil.

Description

TECHNICAL FIELD The present disclosure relates to a distance measurement device. BACKGROUND ART A distance measurement device that measures a distance to an object using light is known. Patent Literature 1 discloses a distance measurement device including a mirror inclined with respect to a rotation center axis, a drive unit that rotates the mirror about the rotation center axis, and a condenser lens that is provided on the rotation center axis and that condenses reflected light reflected by the mirror onto a photodetector. CITATION LIST PATENT LITERATURE Patent Literature 1: JP2015-148605A SUMMARY OF INVENTION TECHNICAL PROBLEM In the distance measurement device, a bearing may be used to smoothly rotate the mirror. In the bearing, grease is used for an internal rolling element in order to reduce a frictional force. A part of the grease may volatilize and be discharged to the outside of the bearing, which may contaminate the inside of the distance measurement device. An object of the present disclosure is to prevent grease or the like discharged from a bearing from contaminating the inside of a distance measurement device. SOLUTION TO PROBLEM A distance measurement device according to the present disclosure is a distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object, the distance measurement device including: a fixed portion; a rotation portion configured to rotate with respect to the fixed portion; a lipophilic lid portion configured to cover the rotation portion; and a bearing connected to the rotation portion. A distance measurement device according to the present disclosure is a distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object, the distance measurement device including: a fixed portion; a rotation portion configured to rotate with respect to the fixed portion; and a bearing connected to the rotation portion, in which the rotation portion includes a rotation fin configured to rotate together with the rotation portion and generate an airflow. A distance measurement device according to the present disclosure is a distance measurement device for measuring a distance to an object using projection light and reflected light obtained by reflecting the projection light on the object, the distance measurement device including: a fixed portion; a rotation portion configured to rotate with respect to the fixed portion; and a bearing that includes an outer ring and an inner ring and that is connected to the rotation portion, in which a first surface of the bearing has a labyrinth structure. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, it is possible to prevent grease or the like discharged from a bearing from contaminating the inside of a distance measurement device. BRIEF DESCRIPTION OF DRAWINGS [FIG. 1A] FIG. 1A is an external perspective view of a distance measurement device according to Embodiment 1.[FIG. 1B] FIG. 1B is a perspective view showing a configuration of the distance measurement device with an outer cover portion and a tube cover removed according to Embodiment 1.[FIG. 2] FIG. 2 is a longitudinal cross-sectional view of the distance measurement device according to Embodiment 1.[FIG. 3] FIG. 3 is a perspective cross-sectional view of the distance measurement device according to Embodiment 1, in which a fixed portion and a rotation portion are disassembled.[FIG. 4A] FIG. 4A is a view of a rotation fin according to Embodiment 1 as viewed obliquely from above.[FIG. 4B] FIG. 4B is a view of the rotation fin according to Embodiment 1 as viewed obliquely from below.[FIG. 5A] FIG. 5A is a view of a fixed support base according to Embodiment 1 as viewed obliquely from above.[FIG. 5B] FIG. 5B is a view of the fixed support base according to Embodiment 1 as viewed obliquely from below.[FIG. 6] FIG. 6 is a longitudinal cross-sectional view showing the airflow inside the distance measurement device according to Embodiment 1.[FIG. 7A] FIG. 7A is a top view of the rotation fin, the bearing, and the fixed support base according to Embodiment 1.[FIG. 7B] FIG. 7B is a bottom view of the rotation fin, the bearing, and the fixed support base according to Embodiment 1.[FIG. 8A] FIG. 8A is a longitudinal cross-sectional view showing a configuration example of the bearing according to Embodiment 1.[FIG. 8B] FIG. 8B is a longitudinal cross-sectional view showing a modification of the bearing according to Embodiment 1.[FIG. 9] FIG. 9 is a perspective view showing a configuration of the distance measurement device with the outer cover portion and a top surface lid removed according to Embodiment 1.[FIG. 10A] FIG. 10A is a view of a lens cover according to Embodiment 1 as viewed obliquely from above.[FIG. 10B] FIG. 10B is a view of the lens cover according to Embodiment 1 as v