US 2012/0257261 A1Published application

Actuator and optical scanner

AssigneeSeiko Epson Corporation

InventorsMakiko HINO, Yasushi MIZOGUCHI

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Abstract

An actuator includes a movable portion which can swing around a swing axis, a connecting portion which extends from the movable portion, and a support portion which supports the connecting portion, wherein the movable portion is formed in a cross shape which includes a pair of first protrusions protruding along a direction perpendicular to the swing axis and a pair of second protrusions protruding along a direction parallel to the swing axis, and when a length of the movable portion in the direction perpendicular to the swing axis is A, a length of the movable portion in the direction parallel to the swing axis is B, a length of the first protrusion in the direction perpendicular to the swing axis is a, and a length of the second protrusion in the direction parallel to the swing axis is b, the following equations (A) and (B) are satisfied. 0.8 × { 1 2  ( A - 1 3 A 2 + 1 B 2 ) } ≤ a ≤ 20 × { 1 2  ( A - 1 1 3  A 2 + 1 B 2 ) } ( A ) 0.8 × { 1 2  ( B - 1 1 3  A 2 + 1 B 2 ) } ≤ b ≤ 2.0 × { 1 2  ( B - 1 3 A 2 + 1 B 2 ) } ( B )

Claims19

Dependent claims

An actuator comprising:

a movable portion which can swing around a swing axis;
a connecting portion which extends from the movable portion and is torsionally deformed according to the swing of the movable portion;
and
a support portion which supports the connecting portion,
wherein the movable portion is formed in a cross shape which includes a pair of first protrusions protruding to both sides of the movable portion along a direction perpendicular to the swing axis and a pair of second protrusions protruding to both sides of the movable portion along a direction parallel to the swing axis in plan view in a thickness direction of the movable portion, and
when a length of the movable portion in the direction perpendicular to the swing axis is A, a length of the movable portion in the direction parallel to the swing axis is B, a length of the first protrusion in the direction perpendicular to the swing axis is a, and a length of the second protrusion in the direction parallel to the swing axis is b, the following equations (A) and (B) are satisfied
0.8
×
{
1
2

(
A
-
1
3
A
2
+
1
B
2
)
}
≤
a
≤
2.0
×
{
1
2

(
A
-
1
1
3


A
2
+
1
B
2
)
}
(
A
)
0.8
×
{
1
2

(
B
-
1
1
3


A
2
+
1
B
2
)
}
≤
b
≤
2.0
×
{
1
2

(
B
-
1
3
A
2
+
1
B
2
)
}
(
B
)

97 more elements

An optical scanner comprising:

a movable portion which includes a light reflecting portion having light reflectivity and can swing around a swing axis,
a connecting portion which extends from the movable portion and is torsionally deformed according to the swing of the movable portion, and
a support portion which supports the connecting portion,
wherein the movable portion is formed in a cross shape which includes a pair of first protrusions protruding to both sides of the movable portion along a direction perpendicular to the swing axis and a pair of second protrusions protruding to both sides of the movable portion along a direction parallel to the swing axis in plan view in a thickness direction of the movable portion, and
when a length of the movable portion in the direction perpendicular to the swing axis is A, a length of the movable portion in the direction parallel to the swing axis is B, a length of the first protrusion in the direction perpendicular to the swing axis is a, and a length of the second protrusion in the direction parallel to the swing axis is b, the following equations (A) and (B) are satisfied
0.8
×
{
1
2

(
A
-
1
3
A
2
+
1
B
2
)
}
≤
a
≤
2.0
×
{
1
2

(
A
-
1
1
3


A
2
+
1
B
2
)
}
(
A
)
0.8
×
{
1
2

(
B
-
1
1
3


A
2
+
1
B
2
)
}
≤
b
≤
2.0
×
{
1
2

(
B
-
1
3
A
2
+
1
B
2
)
}
.
(
B
)

97 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/439,239Filed 4 Apr 2012
Priority: JP 2011-0848416 Apr 2011
Published: 11 Oct 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02K 33/16
Motors with reciprocating, oscillating or vibrating magnet, armature or coil system: with polarised armatures moving in alternate directions by…
G02B 26/085
The reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD: the reflecting means being moved or deformed by electromagnetic means
H04N 1/113
Scanning arrangements , i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing…:…
Y10T 74/18568
Mechanical movements: reciprocating or oscillating to or from alternating rotary