# US 6,295,171 B1 · Piezoelectric light beam deflector

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- Number: US 6,295,171 B1
- Document ID: US6295171B1
- Status: Granted
- Kind: B1
- Application number: 09/737,506
- Filed: 2000-12-15
- Granted: 2001-09-25
- Earliest claimed: 1999-07-09
- Assignees: Advanced Optical Technologies, LLC
- Inventors: Yong-Sheng Chao; Ying Zhao
- Web page: https://patentgrep.com/patent/US6295171B1

## CPC

- G02B 26/0875: {by means of one or more refracting elements}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A light beam deflector comprises an initial beam deflector that imparts a small initial deflection, and a beam deflection amplifier that increases the initial small deflection by a multiplication factor. There are five embodiments of the initial beam deflector. The first four use a pair of lenses and a piezoelectric actuator affixed to one lens. When the parallel lens axes are separated by a distance, the incident light beam will be deflected by a small angle, typically up to about 5°. The fifth embodiment comprises a mirror affixed to a piezoelectric actuator, which tilts the mirror. The beam deflection amplifier has five embodiments. The first is a Keplerian telescope lens first stage and a negative lens system second stage. The first is a Galilean telescope lens first stage and a negative lens system second stage. The third embodiment is either a Keplerian or Galilean telescope lens alone. The fourth embodiment replaces the single second lens of the first stage with a compound lens system. The fifth embodiment uses a special sphere lens alone.

## Claims

### Claim 1

A light beam deflector adapted for deflecting a source light beam emitted from a light source, said deflector having an optical axis and comprising:
(a) in physical order, an initial beam deflector and a beam deflection amplifier;
(b) said initial beam deflector receiving said source light beam and emitting an initially deflected light beam at an initial deflection angle θ0;
(c) said initial beam deflector including at least one piezoelectric actuator for controlling said initial deflection angle θ0;
(d) said beam deflection amplifier having a deflection angle amplification factor A>1; and
(e) said beam deflection amplifier receiving said initially deflected light beam and transmitting a fully deflected light beam at a full deflection angle θ=Aθ0.

### Claim 2 (depends on 1)

The light beam deflector of claim 1 wherein said initial beam deflector includes, in physical order, a first lens and a second lens, each of said lenses having an optical axis, said optical axes being parallel, one of said lenses being affixed to said at least one piezoelectric actuator such that said at least one piezoelectric actuator can move said affixed lens in at least one dimension.

### Claim 3 (depends on 2)

The light beam deflector of claim 2 wherein said lens are positive lenses.

### Claim 4 (depends on 2)

The light beam deflector of claim 2 wherein said first lens is a positive lens and said second lens is a negative lens.

### Claim 5 (depends on 2)

The light beam deflector of claim 2 wherein said initial beam deflector includes a mirror, wherein said second lens is between said first lens and said mirror.

### Claim 6 (depends on 2)

The light beam deflector of claim 2 wherein said lens optical axes are parallel to said deflector optical axis.

### Claim 7 (depends on 1)

The light beam deflector of claim 1 wherein said initial beam deflector includes a mirror affixed to said at least one piezoelectric actuator such that said at least one piezoelectric actuator can tilt said mirror in at least one angular dimension.

### Claim 8 (depends on 1)

The light beam deflector of claim 1 wherein said beam deflection amplifier includes a first amplification stage and a second amplification stage, said second amplification stage including a negative lens.

### Claim 9 (depends on 8)

The light beam deflector of claim 8 wherein said beam deflection amplifier first amplification stage includes at least two positive lenses.

### Claim 10 (depends on 8)

The light beam deflector of claim 8 wherein said beam deflection amplifier first amplification stage includes, in physical order, a positive lens and a negative lens.

### Claim 11 (depends on 1)

The light beam deflector of claim 1 wherein said amplification factor A is a constant.

### Claim 12 (depends on 1)

The light beam deflector of claim 1 wherein said amplification factor A is a function of said initial deflection angle θ0.