Optical unit
An optical assembly includes a fixed body and a movable body supported swingably with respect to the fixed body, and the movable body includes an optical element including an optical axis, a holder into which the optical element is insertable, a contact portion in the holder and in contact with the fixed body, and an elastic body to press the contact portion toward the fixed body.
1 . An optical assembly comprising:
a fixed body; and
a movable body supported swingably with respect to the fixed body; wherein
the movable body includes:
an optical element including an optical axis;
a holder into which the optical element is insertable;
a contact portion located in the holder and contactable with the fixed body; and
an elastic body to press the contact portion toward the fixed body; and
the elastic body is located between the holder and the optical element.
2 . The optical assembly according to claim 1 , wherein the elastic body presses the contact portion along a direction orthogonal to the optical axis of the optical element.
3 . The optical assembly according to claim 1 , wherein the elastic body includes a leaf spring.
4 . The optical assembly according to claim 3 , wherein at least a portion of the leaf spring extends in a perpendicular direction with respect to the optical axis.
5 . The optical assembly according to claim 3 , wherein
the leaf spring includes a first end fixed to the holder and a second end not fixed to the holder; and
a distance between a contact position of the leaf spring in contact with the contact portion and the first end is greater than a distance between the contact position of the leaf spring and the second end.
6 . The optical assembly according to claim 5 , wherein
the leaf spring includes a fixed portion including the first end, a linear portion bent with respect to the fixed portion, and a curved portion including the second end and curved with respect to the linear portion; and
the curved portion of the leaf spring presses the contact portion.
7 . The optical assembly according to claim 1 , wherein
the holder includes a through hole connecting an inside and an outside of the holder;
the contact portion is disposed in the through hole; and
the through hole extends linearly from the optical axis.
8 . The optical assembly according to claim 7 , wherein
the contact portion includes a small-diameter portion and a large-diameter portion, which has a diameter larger than a diameter of the small-diameter portion; and
the large-diameter portion opposes the elastic body.
9 . The optical assembly according to claim 8 , wherein the small-diameter portion of the contact portion is located in the through hole of the holder.
10 . The optical assembly according to claim 1 , wherein the contact portion slides with respect to the fixed body.
11 . The optical assembly according to claim 1 , wherein the contact portion includes a protrusion protruding to the fixed body.
12 . The optical assembly according to claim 11 , wherein the protrusion includes a portion of a spherical surface.
13 . The optical assembly according to claim 11 , wherein the fixed body includes a concave surface in a region in contact with the protrusion.
14 . The optical assembly according to claim 13 , wherein the concave surface has a concave spherical shape.
15 . The optical assembly according to claim 13 , wherein the fixed body includes a cutout continuous to the concave surface.
16 . The optical assembly according to claim 1 , wherein
the holder includes an inner peripheral surface provided with a through hole to hold the optical element;
the inner peripheral surface includes:
a first inner surface;
a second inner surface;
a third inner surface;
a fourth inner surface;
a first corner located between the first inner surface and the second inner surface;
a second corner located between the second inner surface and the third inner surface;
a third corner located between the third inner surface and the fourth inner surface; and
a fourth corner located between the fourth inner surface and the first inner surface; and
the contact portion includes:
a first contact portion located at the first corner of the holder;
a second contact portion located at the second corner of the holder;
a third contact portion located at the third corner of the holder; and
a fourth contact portion located at the fourth corner of the holder.
17 . The optical assembly according to claim 16 , wherein
the elastic body includes:
a first elastic body that presses the first contact portion toward the fixed body; and
a second elastic body that presses the second contact portion toward the fixed body.
18 . The optical assembly according to claim 17 , wherein a direction in which the first elastic body presses the first contact portion and a direction in which the second elastic body presses the second contact portion intersect on the optical axis of the optical element.