# US 7,744,220 B2 · Deformable mirror device and apparatus for observing retina of eye using the same

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- Number: US 7,744,220 B2
- Document ID: US7744220B2
- Status: Granted
- Kind: B2
- Application number: 12/186,142
- Filed: 2008-08-05
- Published: 2009-02-12
- Granted: 2010-06-29
- Earliest claimed: 2007-08-08
- Assignees: Kabushiki Kaisha Toshiba; Topcon Corporation
- Inventors: Kei Masunishi; Akihiro Koga; Ryo Furukawa; Osamu Nishimura; Akio Kobayashi; Hiroyuki Kawashima
- Web page: https://patentgrep.com/patent/US7744220B2

## CPC

- G02B 26/0825: {the reflecting element being a flexible sheet or membrane, e.g. for varying the focus (flexible mirrors for cosmetic use A45D42/24)}
- A61B 3/10: Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A deformable mirror device includes a substrate; a plurality of electrodes provided on the substrate; a spacer disposed on the substrate; a support member disposed above the spacer and having an opening passing through from a first face of the support member facing to the substrate to a second face of the support member opposite from the first face; a deformable electrode film formed below the first face of the support member so as to be opposed to the electrodes with a distance and so as to cover the opening; an insulation film provided between the deformable electrode film and the support member; and a reflection film provided on a face of the deformable electrode film opposite from the electrodes so as to overlap the opening. The electrodes are electrically insulated each other by a plurality of grooves radially extending from a region which includes a position corresponding to a center of the opening.

## Claims

### Claim 1

An apparatus for observing retina of an eye comprising:
a retina illumination system configured to illuminate retina of an eye to be examined with illumination light to observe the retina;
a compensation optical part configured to comprise a deformable mirror device, and correct a reflected image obtained from the retina by the illumination light of the retina illumination system by changing a shape of the deformable mirror device responding to a given correction quantity;
a retina image forming optical system configured to receive the retina image corrected by the compensation optical part and form a retina image; and
a retina image light receiving part configured to receive the retina image formed by the retina image forming optical system,
wherein the deformable mirror device comprises:
a substrate;
a plurality of electrodes provided on the substrate;
a spacer disposed on the substrate;
a support member disposed above the spacer and having an opening passing through from a first face of the support member facing to the substrate to a second face of the support member opposite from the first face;
a deformable electrode film formed below the first face of the support member so as to be opposed to the electrodes with a distance and so as to cover the opening;
an insulation film provided between the deformable electrode film and the support member; and
a reflection film provided on a face of the deformable electrode film opposite from the electrodes so as to overlap the opening,
the electrodes being electrically insulated from each other by a plurality of grooves radially extending from a region which includes a position corresponding to a center of the opening.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein the electrodes are electrically insulated from each other by the grooves which extend from the center of the opening at an equal angle interval.

### Claim 3 (depends on 1)

The apparatus according to claim 1, wherein the electrodes are electrically insulated from each other by a plurality of grooves disposed concentrically around the position corresponding to the center of the opening.

### Claim 4 (depends on 1)

The apparatus according to claim 1, wherein
a film of the same material as that of the electrodes is formed in a region on the substrate located outside an outermost circumference of the electrodes, and
the film is divided by radially extending grooves.

### Claim 5 (depends on 1)

The apparatus according to claim 1, wherein
the support member comprises silicon,
the insulation film comprises silicon oxide, and
the deformable electrode film comprises a silicon film doped with impurities.