Aperture of polygon scanning mirror in ophthalmic imaging device

Abstract

The ophthalmic imaging device comprises a light source that emits a light beam, a polygon scanning mirror having a plurality of reflective facets, each extending in a first direction within the mirror's rotation plane and in a common second direction perpendicular to the rotation plane, a driver configured to rotate the mirror so that each facet reflects the beam, an optical element that guides the reflected beam to the eye and the reflected light from the eye to the mirror, a detector that detects the reflected light reflected from the mirror, and an aperture that restricts the reflected light reaching the detector to be light reflected from a region of each facet extending to at least one of the same first distance in each facet's first direction and the same second distance in the common second direction of each facet. [Effect] Image quality can be significantly improved.

Claims

1. A light source (200) configured to emit a light beam (201), A polygon scanning mirror (202) having a plurality of reflective facets (2021, 2022, ...), wherein each of the plurality of facets (2021, 2022, ...) reflects in each first direction (d) within the rotation plane of the polygon scanning mirror (202). １ ) extends in a common second direction (d) perpendicular to the rotation plane of the polygon scanning mirror (202). ２ A polygon scanning mirror (202) extends to the ) and A driver (203) is configured to rotate the polygon scanning mirror (202) within the rotation plane during operation so that each facet (2021, 2022, ...) reflects the light beam (201), The light beam (201) reflected from the polygon scanning mirror (201) is guided to the subject's eye (E), and the reflected light (L) that returns from the eye (E) is directed to the subject's eye (E). Ｒ An optical element (204) configured to guide the ) to the polygon scanning mirror (202), The reflected light (L) from the polygon scanning mirror (202) Ｒ ) detects the detection signal (S ｄ A detector (205) configured to generate ), The reflected light (L) reaching the detector (205) Ｒ An aperture (206) configured to restrict the light to be reflected from a region (2021(A)) on each facet (2021, 2022, ...), wherein the region (2021(A)) is in the first direction (d) of each facet １ ) the same first distance, and the common second direction of each facet (d ２ An aperture (206) extending to at least one of the same second distances, The access (207) to a computing resource (106) configured to generate an image (210) of the eye (E) using the detection signal (S Ｒ ), generated from the return light (L ｄ ) reflected by at least one facet (2021, 2022, …). An ophthalmic imaging device (102, 120) equipped with the following.

2. The region (2021(A)) on each facet (2021, 2022, ...) is in the first direction (d) of each facet. １ ) extends by the same first distance in each facet, and the common second direction (d ２ The ophthalmic imaging device (102, 120) according to claim 1, wherein the regions are of the same size and extend by the same second distance in the ophthalmic imaging device (102, 120).

3. The driver (203) rotates the polygon scanning mirror (202) in the rotation plane during operation so that the light beam (201) is reflected at an angle (α) in which each facet (2021, 2022, ...) changes. The optical element (204) directs the light beam (201) reflected from the polygon scanning mirror (202) to the subject's eye (E) only during the rotation of the polygon scanning mirror (202) corresponding to the same portion (β) of the changing angle (α) of each facet (2021, 2022, ...). The ophthalmic imaging device (102, 120) according to claim 2.

4. The driver (203) rotates the polygon scanning mirror (202) in the rotation plane during operation so that the light beam (201) is reflected at an angle (α) in which each facet (2021, 2022, ...) changes. The detection signal (S) used to generate the image (210) of the eye (E) ｄ ) is a signal generated during the rotation of the polygon scanning mirror (202) corresponding to each portion (β) of the changing angle (α) of the at least one facet (2021, 2022, ...), and the detection signal (S) is not used to generate the image (210) of the eye (E). ｄ ) is ignored by the computing resource (106), An ophthalmic imaging device (102, 120) according to claim 1 or claim 2.

5. The aperture (206) further comprises the light beam (201) and the reflected light (L Ｒ The light is configured to pass through the aperture (206) and be reflected from each facet (2021, 2022, ...) of the polygon scanning mirror (202), and the reflected light (L Ｒ An ophthalmic imaging device (102, 120) according to any one of claims 1 to 4, configured to project onto the region (2021(A)) on each facet so as to reflect from the region (2021(A)) on each facet.

6. The plurality of facets (2021, 2022, ...) are rectangular, and each facet has a length defined by the lengths of two sides (2021-3, 2021-4) parallel to the plane of rotation and a width defined by the lengths of two sides (2021-1, 2021-2) perpendicular to the plane of rotation, and the aperture (206) is rectangular, and has a length defined by the lengths of two sides (206-3, 206-4) parallel to the plane of rotation and a width defined by the lengths of two sides (206-1, 206-2) perpendicular to the plane of rotation, as described in any one of claims 1 to 5 (102, 120).

7. The ophthalmic imaging device (102, 120) according to any one of claims 1 to 6, wherein the region (2021(A)) on each facet (2021, 2022, ...) is the central region (2021(A)) on the facet surrounded by the outer peripheral region (2021(B)) on the facet.

8. The ophthalmic imaging device (102, 120) according to claim 7, wherein the distance between each facet between the central region (2021(A)) on the facet and the periphery of the facet is greater than or equal to a predetermined distance (222, 223).

9. The predetermined distances (222, 223) are in the respective first directions (d １ ) and the common second direction (d ２ The ophthalmic imaging device (102, 120) according to claim 8, wherein the distance over which the facet extends in at least one of the two faces is 0.1%, 1%, or 10% of the distance over which the facet extends.

10. The ophthalmic imaging device (102, 120) according to any one of claims 1 to 9, wherein the polygon scanning mirror (202) is surrounded by a housing (208) having an opening (209).

11. The ophthalmic imaging device (102, 120) according to claim 10, wherein the opening (209) is provided with a phase mask (210).

12. The ophthalmic imaging apparatus (102, 120) according to claim 10 or 11, wherein the aperture (206) is located within a plate (207), and the plate (207) is mounted on the housing (208) on the opening (209) of the housing (208) so as to align the aperture (206) with the opening (209).

13. The image (210) of the eye (E) is the reflected light (L) reflected by all facets (2021, 2022, ...) during the rotation of the polygon scanning mirror (202). Ｒ The detection signal (S) generated from ) ｄ An ophthalmic imaging device (102, 120) according to any one of claims 1 to 12, which is generated using ).

14. The ophthalmic imaging device (102, 120) according to any one of claims 1 to 13, wherein the polygon scanning mirror (202) is a convex polygon having 16 facets.

15. A method for operating an ophthalmic imaging device (102, 120) according to any one of claims 1 to 14, The driver (203) rotates the polygon scanning mirror (202) so that each facet (2021, 2022, ...) reflects the light beam (201) (S101), The optical element (204) guides the light beam (201) reflected from the polygon scanning mirror (202) to the subject's eye (E) (S102), The optical element (204) reflects the light (L) back from the eye (E). Ｒ ) to be guided to the polygon scanning mirror (202) (S103), The detector (205) restricts the reflected light (L) that is limited by the aperture (206). Ｒ The detection signal (S ｄ ) to generate (S104), The computing resource (106) processes the reflected light (L) from at least one facet. Ｒ The detection signal (S) generated from ) ｄ (S105) generating the image (210) of the eye (E) using, A method that includes this.

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