Optical unit

Patent metadata

Field	Value
Publication number	US-11640041-B2
Application number	US-202117476413-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Sep 29, 2020
Publication date	May 2, 2023
Grant date	May 2, 2023

Abstract

An optical unit includes: a reflection portion that reflects an incident light flux incident from outside on a reflection surface in a reflection direction from an incident direction toward an imaging element; a movable body having the reflection portion and a holder supporting the reflection portion; a fixed body; a rotation support mechanism that causes the movable body to rotate with respect to the fixed body with an axial direction as a rotation axis; and a drive mechanism having a magnet and a coil and causing the movable body to rotate with respect to the fixed body. The magnet is provided at a position not contacting the reflection portion in the holder and on a back side of the reflection surface, and has a parallel surface parallel to the reflection surface. The coil is provided at a position opposing the magnet in the fixed body.

First claim

What is claimed is:

1. An optical unit comprising:
a reflection portion, configured to reflect an incident light flux incident from outside on a reflection surface in a reflection direction from an incident direction toward an imaging element;
a movable body, including the reflection portion and a holder configured for supporting the reflection portion;
a fixed body;
a rotation support mechanism, configured to cause the movable body to rotate with respect to the fixed body with an axial direction crossing the incident direction and the reflection direction as a rotation axis; and
a drive mechanism, including a magnet and a coil, and the magnet and the coil being configured to cause the movable body to rotate with respect to the fixed body,
wherein
the magnet of the drive mechanism is provided at a position not contacting the reflection portion in the holder and on a back side of the reflection surface, and includes a parallel surface parallel to the reflection surface,
the holder comprises a placement portion for the magnet on the back side of the reflection surface, and the placement portion is formed so that the parallel surface of the magnet is set to be parallel to the reflection surface, and
the coil of the drive mechanism is provided at a position opposing the magnet in the fixed body on the back side of the reflection surface and thereby, the holder supporting the reflection portion is capable of being rotated by the magnet whose parallel surface is parallel to the reflection surface and the coil.

2. The optical unit according to claim 1 , wherein
the magnet is provided at a position including a region on an extension line of a central portion of the reflection surface in a perpendicular direction to the reflection surface.

3. The optical unit according to claim 2 , wherein
the rotation axis is located on an extension line in a direction that extends from a central portion of a region where the magnet and the coil oppose each other to an opposing direction in which the magnet and the coil oppose each other.

4. The optical unit according to claim 1 , wherein
the fixed body comprises a magnetic body on an opposite side to the magnet with reference to the coil in an opposing direction in which the magnet and the coil oppose each other.

5. The optical unit according to claim 1 , wherein
the movable body comprises a magnetic body on an opposite side to the coil with reference to the magnet in an opposing direction in which the magnet and the coil oppose each other.

Assignees

• Nidec Sankyo Corp

Inventors

• Arai Tsutomu
• Kasahara Shogo
• Sue Takeshi

Classifications

• G02B7/1805 Primary

  for prisms (G02B7/181 takes precedence) · CPC title