Deformable mirror system, control method therefor, and ophthalmic apparatus
First Claim
1. A deformable mirror system comprising:
- a deformable mirror configured to change a shape of a reflecting surface by a deformation amount in accordance with an input signal;
a light wavefront measurement unit configured to measure a light wavefront shape of reflected light via the deformable mirror; and
a processor implementing steps comprising;
(1) calculating the deformation amount to correct the light wavefront shape of the reflected light into a wavefront without an aberration;
(2) calculating the input signal to input to the deformable mirror using a conversion factor based on the calculated deformation amount, the conversion factor being a correction value for a signal used in calculating the input signal to the deformable mirror required to change the light wavefront shape by a reference amount;
(3) controlling the deformable mirror to change the shape of the reflecting surface in accordance with the calculated input signal;
(4) calculating a variation amount of the light wavefront shape between a first light wavefront shape measured by the light wavefront measurement unit and a second light wavefront shape measured by the light wavefront measurement unit, wherein the first light wavefront shape is a light wavefront shape which was measured before the changing of the shape of the reflecting surface, and the second light wavefront shape is a light wavefront shape which was measured after the changing of the shape of the reflecting surface;
(5) calculating a shape difference amount between the calculated variation amount and the calculated deformation amount; and
(6) updating the conversion factor and implementing the steps (2) through (5) in a case of the calculated shape difference amount not satisfying a predetermined condition, and repeating the steps (1) through (5) in a case of the calculated shape difference amount satisfying the predetermined condition.
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Accused Products
Abstract
For reducing a time utilized in an AO process, provided is a deformable mirror system, including: a deformable mirror capable of changing a shape of a reflecting surface by a deformation amount in accordance with an input signal; a light wavefront measurement apparatus configured to measure a light wavefront shape of reflected light from the deformable mirror; a conversion factor calculation apparatus configured to calculate a conversion factor used in obtaining the input signal from a variation in light wavefront shape of the reflected light with respect to a change in input signal; a shape difference calculation apparatus configured to calculate a shape difference between the light wavefront shape measured by the light wavefront measurement apparatus and a light wavefront shape calculated from the input signal; and a conversion factor update unit configured to update the conversion factor in accordance with the calculated shape difference.
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Citations
12 Claims
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1. A deformable mirror system comprising:
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a deformable mirror configured to change a shape of a reflecting surface by a deformation amount in accordance with an input signal; a light wavefront measurement unit configured to measure a light wavefront shape of reflected light via the deformable mirror; and a processor implementing steps comprising; (1) calculating the deformation amount to correct the light wavefront shape of the reflected light into a wavefront without an aberration; (2) calculating the input signal to input to the deformable mirror using a conversion factor based on the calculated deformation amount, the conversion factor being a correction value for a signal used in calculating the input signal to the deformable mirror required to change the light wavefront shape by a reference amount; (3) controlling the deformable mirror to change the shape of the reflecting surface in accordance with the calculated input signal; (4) calculating a variation amount of the light wavefront shape between a first light wavefront shape measured by the light wavefront measurement unit and a second light wavefront shape measured by the light wavefront measurement unit, wherein the first light wavefront shape is a light wavefront shape which was measured before the changing of the shape of the reflecting surface, and the second light wavefront shape is a light wavefront shape which was measured after the changing of the shape of the reflecting surface; (5) calculating a shape difference amount between the calculated variation amount and the calculated deformation amount; and (6) updating the conversion factor and implementing the steps (2) through (5) in a case of the calculated shape difference amount not satisfying a predetermined condition, and repeating the steps (1) through (5) in a case of the calculated shape difference amount satisfying the predetermined condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12)
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9. A control method for a deformable mirror system, the control method comprising:
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(1) calculating a deformation amount to correct a first light wavefront shape of reflected light, the first light wavefront shape having been measured by a light wavefront measurement unit, into a wavefront without an aberration; (2) calculating an input signal to input to a deformable mirror using a conversion factor based on the calculated deformation amount, the conversion factor being a correction value for a signal used in calculating the input signal to the deformable mirror required to change the light wavefront shape by a reference amount; (3) controlling the deformable mirror to change a shape of a reflecting surface of the deformable mirror in accordance with the calculated input signal; (4) measuring a second light wavefront shape of reflected light via the changed reflecting surface of the deformable mirror; (5) calculating a variation amount of the light wavefront shape between the first light wavefront shape and the second light wavefront shape, wherein the first light wavefront shape is a light wavefront shape which was measured before the changing of the shape of the reflecting surface, and the second light wavefront shape is a light wavefront shape which was measured after the changing of the shape of the reflecting surface; (6) calculating a shape difference amount between the calculated variation amount and the calculated deformation amount; and (7) updating the conversion factor and implementing the steps (2) through (6) in a case of the calculated shape difference amount not satisfying a predetermined condition, and repeating (1) through (6) in a case of the calculated shape difference amount satisfying the predetermined condition.
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10. A non-transitory recording medium having recorded thereon a program for causing a computer to execute each of steps of a control method for a deformable mirror system, the control method comprising:
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(1) calculating a deformation amount to correct a first light wavefront shape of reflected light, the first light wavefront shape having been measured by a light wavefront measurement unit, into a wavefront without an aberration; (2) calculating an input signal to input to a deformable mirror using a conversion factor based on the calculated deformation amount, the conversion factor being a correction value for a signal used in calculating the input signal to the deformable mirror required to change the light wavefront shape by a reference amount; (3) controlling the deformable mirror to change the shape of a reflecting surface of the deformable mirror in accordance with the calculated input signal; (4) measuring a second light wavefront shape of reflected light via the changed reflecting surface of the deformable mirror; (5) calculating a variation amount of the light wavefront shape between the first light wavefront shape and the second light wavefront shape, wherein the first light wavefront shape is a light wavefront shape which was measured before the changing of the shape of the reflecting surface, and the second light wavefront shape is a light wavefront shape which was measured after the changing of the shape of the reflecting surface; (6) calculating a shape difference amount between the calculated variation amount and the calculated deformation amount; and (7) updating the conversion factor and implementing the steps (2) through (6) in a case of the calculated shape difference amount not satisfying a predetermined condition, and repeating (1) through (6) in a case of the calculated shape difference amount satisfying the predetermined condition.
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Specification