Flexure-based focus mechanism

Patent metadata

Field	Value
Publication number	US-9733448-B1
Application number	US-201213610072-A
Country	US
Kind code	B1
Filing date	Sep 11, 2012
Priority date	Sep 13, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Techniques and architecture are disclosed for stabilizing optical/imaging componentry over a broad range of environmental conditions and stressors. A flexure-based focus mechanism provided using the disclosed techniques may help to minimize or otherwise reduce the effects of a wide variety of stressors (e.g., vibration, torque, thermal expansion/contraction, etc.), thus assisting with achieving and/or maintaining fine focus with an optical/imaging component. In some cases, such a mechanism can be: (1) operatively coupled with a given optical/imaging system component; and/or (2) integrated therewith. In some instances, an optional drive assembly may be implemented in conjunction with such a mechanism to assist with achieving and/or maintaining fine focus.

First claim

What is claimed is:

1. An apparatus comprising:
a mechanism configured to be operatively coupled with an optical/imaging component, the mechanism comprising a wall having a flexure pattern that defines an elongated member formed therein, the member extending along a distance of the wall in a first direction and having first and second ends and being attached at only the first end via first and second flexure points, the member including
a first flexure bar extending from the first flexure point and along the first direction,
a second flexure bar extending from the second flexure point and along the first direction, and
a mounting portion configured to receive the optical/imaging component, wherein the mounting portion is operatively coupled to the first flexure bar and the second flexure bar proximate to the second end of the member, wherein the mounting portion resides directly between the first and second flexure bars;

wherein the flexure pattern passes completely through the wall thereby further defining a wall portion of the wall that is in addition to the member, the wall portion is located adjacent to each side of the member so as to surround the member and the flexure pattern, and flexing of the member produces a movement of the optical/imaging component.

2. The apparatus of claim 1 , wherein:
the first flexure bar is defined by
a first pair of parallel cuts formed adjacent to one another without overlapping/intersecting,
a first pair of holes formed adjacent one another without overlapping/intersecting, thereby defining the first flexure point there between, and
a second pair of holes formed adjacent one another without overlapping/intersecting, thereby defining a third flexure point there between,
wherein the first and second pairs of holes are provided at opposing ends of the first pair of parallel cuts such that one end of the first flexure bar tapers into the first flexure point and another end of the first flexure bar tapers into the third flexure point; and

the second flexure bar is defined by
a second pair of parallel cuts formed adjacent to one another without overlapping/intersecting,
a third pair of holes formed adjacent one another without overlapping/intersecting, thereby defining the second flexure point there between, and
a fourth pair of holes formed adjacent one another without overlapping/intersecting, thereby defining a fourth flexure point there between,
wherein the third and fourth pairs of holes are provided at opposing ends of the second pair of parallel cuts such that one end of the second flexure bar tapers into the second flexure point and another end of the second flexure bar tapers into the fourth flexure point.

3. The apparatus of claim 2 , wherein:
the member is further defined by
a first connecting cut which connects the first and third pairs of holes, and
a second connecting cut which connects the second and fourth pairs of holes;

the first pair of parallel cuts is provided parallel to the second pair of parallel cuts; and
the first and second pairs of parallel cuts are substantially perpendicular to the first and second connecting cuts.

4. The apparatus of claim 1 , wherein the flexing is at least one of one-dimensional, two-dimensional, and three-dimensional.

5. The apparatus of claim 1 , wherein the movement assists with at least one of achieving and maintaining fine focus with the optical/imaging component.

6. The apparatus of claim 1 , wherein the mechanism forms at least part of a housing configured to house at least a portion of the optical/imaging component.

7. The apparatus of claim 1 , wherein the wall having the flexure pattern is a first wall having a first instance of the flexure pattern formed therein, and the mechanism further comprises:
a second wall having a second instance of the flexure pattern formed therein; and
a third wall operatively coupling the first and second walls such that the first and second walls are arranged parallel to one another, defining a gap there between, and such that the first instance of the flexure pattern formed in the first wall and the second instance of the flexure pattern formed in the second wall are in alignment with one another across the gap.

8. The apparatus of claim 7 , wherein the gap is dimensioned to receive the optical/imaging component.

9. The apparatus of claim 7 , wherein the first, second, and third walls define a unitary/continuous piece.

10. The apparatus of claim 7 , wherein the first, second, and third walls comprise discrete pieces securely fastened together.

11. The apparatus of claim 7 further comprising:
a third instance of the flexure pattern, wherein the third instance of the flexure pattern is formed in the first wall adjacent to the first instance of the flexure pattern, and wherein the third instance of the flexure pattern is rotated 180° as compared with the first instance of the flexure pattern; and
a fourth instance of the flexure pattern, wherein the fourth instance of the flexure pattern is formed in the second wall adjacent to the second instance of the flexure pattern, and wherein the fourth instance of the flexure pattern is rotated 180° as compared with the second instance of the flexure pattern;
wherein the third instance of the flexure pattern formed in the first wall and the fourth instance of the flexure pattern formed in the second wall are in alignment with one another across the gap.

12. The apparatus of claim 1 further comprising a drive assembly operatively coupled with the mechanism to cause flexing of the member to produce movement of the optical/imaging component.

13. An apparatus comprising:
a mechanism comprising a wall having a flexure pattern passing completely through a thickness of the wall and that defines an elongated member formed therein and that further defines a wall portion of the wall that is in addition to the member, the wall portion is located adjacent to each side of the member so as to surround the member and the flexure pattern, and the member extending along a distance of the wall in a first direction and having first and second ends and being attached at only the first end via first and second flexure points, the member including
a first flexure bar extending from the first flexure point and along the first direction,
a second flexure bar extending from the second flexure point and along the first direction, and
a mounting portion configured to receive an optical/imaging component, wherein the mounting portion is operatively coupled to the first flexure bar and the second flexure bar proximate to the second end of the member, wherein the mounting portion resides directly there between; and

a drive assembly configured to be operatively coupled with the mechanism to cause flexing of the member to produce a movement of the optical/imaging component;
wherein the movement assists with at least one of achieving and maintaining fine focus with the optical/imaging component.

14. The apparatus of claim 13 , wherein the movement is in the range of about 1-400 μm or greater.

15. The apparatus of claim 13 , wherein the drive assembly comprises:
a drive bar operatively coupled with the optical/imaging component; and
an actuator operatively coupled with the mechanism and configured to engage the drive bar to cause movement of the optical/imaging component relative to the mechanism.

16. The apparatus of claim 13 , wherein the drive assembly comprises:
a flexible drive bar operatively coupled with the optical/imaging component; and
a piezoelectric drive motor configured to engage the flexible drive bar to

Assignees

• Bibeault Steven P
• Bae Sys Inf & Elect Sys Integ

Inventors

• Bibeault Steven P

Classifications

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title

• G02B7/08 Primary

  adapted to co-operate with a remote control mechanism · CPC title