JP2022038529A - Ophthalmologic apparatus, control method for the same, and program - Google Patents

Abstract

To provide a new technology for acquiring an image of high picture quality of the eye to be tested with a simple structure.SOLUTION: An ophthalmologic apparatus includes an illumination light system, an optical scanner, an image capturing optical system, and a control part. The illumination optical system generates illumination light in a slit shape. The optical scanner deflects the illumination light and guides it to a prescribed part of the eye to be tested. The image capturing optical system guides return light of the illumination light from the prescribed part to an image sensor where an opening range on a light receiving surface can be set. The control part controls the optical scanner and the image sensor so that in an image capturing area of the prescribed part, an irradiation range on a light receiving surface corresponding to the radiation range of the illumination light overlaps an opening range in the image capturing area of the prescribed part, and a result of light reception of the return light in the opening range overlapping the irradiation range is acquired.SELECTED DRAWING: Figure 4

Description

The present invention relates to an ophthalmic apparatus, a control method thereof, and a program.

In recent years, screening tests using ophthalmic devices have been performed. Such an ophthalmic appliance is also expected to be applied to self-examination, and further miniaturization and weight reduction are desired.

For example, Patent Documents 1 to 4 disclose an ophthalmic apparatus configured to illuminate an eye to be inspected in a pattern and obtain a light receiving result by a rolling shutter method using an image sensor for the return light. By adjusting the illumination pattern and the light receiving timing by the image sensor, this ophthalmic apparatus can acquire an image of the eye to be inspected with a simple configuration.

U.S. Pat. No. 7831106 U.S. Pat. No. 8,237,835 U.S. Pat. No. 7,335,598 Special Table 2009-538697

However, in the conventional method, the amount of illumination light changes depending on the position in the photographing area, and it may not be possible to acquire a high-quality image of the eye to be inspected. Therefore, a technique for suppressing deterioration of the image quality of the image of the eye to be inspected is desired without complicating the configuration.

The present invention has been made in view of such circumstances, and one of the objects thereof is to provide a new technique for acquiring a higher quality image of an eye to be inspected with a simple configuration. be.

In the first aspect of some embodiments, an illumination optical system that generates slit-shaped illumination light, an optical scanner that deflects the illumination light to guide the illumination light to a predetermined portion of the eye to be inspected, and an opening range on the light receiving surface can be set. The imaging optical system that guides the return light of the illumination light from the predetermined portion to the image sensor and the irradiation range on the light receiving surface corresponding to the irradiation region of the illumination light in the imaging region of the predetermined portion overlap with the opening range. It is an ophthalmic apparatus including a control unit that controls the optical scanner and the image sensor so as to acquire the light receiving result of the return light in the opening range overlapping the irradiation range.

In a second aspect of some embodiments, in the first aspect, the control unit moves the aperture range and the optical scanner and the image sensor so that the irradiation range overlaps the aperture range after the movement. To control.

In a third aspect of some embodiments, in the first aspect, the control unit moves the irradiation range, and the optical scanner and the image so that the aperture range overlaps the irradiation range after the movement. Control the sensor.

In a fourth aspect of some embodiments, in any of the first to third aspects, the control unit controls the optical scanner to scan the illuminated area with the illumination light.

In the fifth aspect of some embodiments, in the fourth aspect, the control unit is in the predetermined portion corresponding to the opening range during one frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the aperture target area covers the photographing area.

In the sixth aspect of some embodiments, in the fifth aspect, the control unit deflects the illumination light at a deflection speed corresponding to the position of the irradiation region of the illumination light in the predetermined portion. The image sensor is controlled so as to set the aperture range having the aperture width corresponding to the position of the irradiation region.

In the seventh aspect of some embodiments, in the fourth aspect, the control unit corresponds to the irradiation region or the aperture range for each frame period in which the light receiving result of the aperture range is captured by the image sensor. The aperture target area at a predetermined portion is changed, and the optical scanner and the image sensor are controlled so that the aperture target area covers the imaging area over two or more frame periods.

In the eighth aspect of some embodiments, in the seventh aspect, the control unit deflects the illumination light at a deflection speed corresponding to the position of the irradiation region of the illumination light in the predetermined portion for each frame period. The image sensor is controlled so as to control the optical scanner and set the aperture range having an aperture width corresponding to the position of the irradiation region.

In the ninth aspect of some embodiments, in the fourth aspect, the control unit has the irradiation area corresponding to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so as to correspond to the opening target area in the predetermined portion and the opening target area covers the imaging area over two or more frame periods.

In the tenth aspect of some embodiments, in the ninth aspect, the control unit irradiates the illumination light for an irradiation time corresponding to the position of the irradiation region of the illumination light in the predetermined portion for each frame period. The optical scanner is controlled so as to illuminate the area, and the image sensor is controlled so as to set the opening range that opens for the opening time corresponding to the position of the irradiation area.

In the eleventh aspect of some embodiments, in any one of the first to tenth aspects, the control unit acquires the light receiving result obtained by the image sensor by the global shutter method.

In the twelfth aspect of some embodiments, in the fourth aspect, the control unit acquires the light receiving result obtained by the image sensor by the rolling shutter method, and the image sensor obtains the light receiving result in the opening range. For each frame period to be captured, the irradiation area overlaps with the opening target area in the predetermined portion corresponding to the opening range, and the optical scanner covers the imaging area so that the opening target area covers the photographing area over two or more frame periods. And control the image sensor.

In the thirteenth aspect of some embodiments, in the twelfth aspect, the control unit irradiates the illumination light for an irradiation time corresponding to the position of the irradiation region of the illumination light in the predetermined portion for each frame period. The optical scanner is controlled so as to illuminate the area, and the image sensor is controlled so as to read the light receiving result of the aperture range corresponding to the position of the irradiation area by the rolling shutter method.

A fourteenth aspect of some embodiments is, in any one of the first to thirteenth aspects, an image forming an image of the predetermined portion based on the light receiving result captured in the aperture range overlapping the irradiation range. Including the forming part.

In a fifteenth aspect of some embodiments, in any of the first to fourteenth aspects, the illumination optics comprises a slit in which the opening can be placed at a position optically coupled to the predetermined portion. The illumination light is generated by the light from the light source passing through the opening, the optical scanner can be arranged at a position optically coupled to the iris of the eye to be inspected, and the light receiving surface is formed on the light receiving surface. It can be arranged at a position optically substantially conjugate with the predetermined portion.

In the 16th aspect of some embodiments, in the 15th aspect, the illumination optical system is arranged between the light source and the slit, and an opening is provided at a position eccentric with respect to the optical axis of the illumination optical system. Is formed and includes an iris aperture that can be placed at a position optically conjugate with the iris, and an opening is formed that can be placed at a position optically conjugate with the iris, and the illumination deflected by the optical scanner. It includes a hole mirror that connects the optical path of light and the optical path of the photographing optical system.

In the 17th aspect of some embodiments, in any of the 1st to 16th aspects, the predetermined site is the fundus.

In the eighteenth aspect of some embodiments, an illumination optical system that generates slit-shaped illumination light, an optical scanner that deflects the illumination light to guide the illumination light to a predetermined portion of the eye to be inspected, and an opening range in the light receiving surface can be set. It is a control method of an ophthalmic apparatus including an imaging optical system that guides a return light of the illumination light from the predetermined portion to an image sensor. In the control method of the ophthalmologic apparatus, the irradiation range on the light receiving surface corresponding to the irradiation area of the illumination light overlaps with the aperture range in the imaging region of the predetermined portion, and the return light in the aperture range overlapping with the irradiation range. It includes a control step of controlling the optical scanner and the image sensor so as to acquire the light receiving result of.

In the 19th aspect of some embodiments, in the 18th aspect, the control step includes an image sensor control step for controlling the image sensor so as to move the opening range, and the opening after the irradiation range is moved. Includes an optical scanner control step that controls the optical scanner so that it overlaps the range.

In the twentieth aspect of some embodiments, in the eighteenth aspect, the control step is an optical scanner control step that moves the irradiation range and the image so that the aperture range overlaps the irradiation range after the movement. Includes an image sensor control step to control the sensor.

In the 21st aspect of some embodiments, in any of the 18th to 20th aspects, the control step controls the optical scanner to scan the illuminated area with the illumination light.

In the 22nd aspect of some embodiments, in the 21st aspect, the control step is performed at the predetermined portion corresponding to the opening range during one frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the aperture target area covers the photographing area.

In the 23rd aspect of some embodiments, in the 21st aspect, the control step corresponds to the irradiation region or the aperture range for each frame period in which the light receiving result of the aperture range is captured by the image sensor. The aperture target area in the portion is changed, and the optical scanner and the image sensor are controlled so that the aperture target area covers the imaging area over two or more frame periods.

In the 24th aspect of some embodiments, in the 21st aspect, in the 21st aspect, the control step is the predetermined position in which the irradiation region corresponds to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so as to correspond to the opening target area in the portion and the opening target area covers the imaging area over two or more frame periods.

In the 25th aspect of some embodiments, in any of the 18th to 24th aspects, the image sensor can acquire a light receiving result by a global shutter method.

In the 26th aspect of some embodiments, in the 18th aspect, the image sensor can acquire a light receiving result by a rolling shutter method, and in the control step, the light receiving result in the aperture range is captured by the image sensor. The optical scanner and the image so that the irradiation target area includes an aperture target area in the predetermined portion corresponding to the opening range for each frame period, and the aperture target area covers the photographing area over two or more frame periods. Control the sensor.

A twenty-seventh aspect of some embodiments comprises, in any of the eighteenth to twenty-sixth aspects, an image forming step of forming an image of the predetermined portion based on the light receiving result captured in the aperture range.

In the 28th aspect of some embodiments, in any of the 18th to 27th aspects, the predetermined site is the fundus.

A 29th aspect of some embodiments is a program that causes a computer to perform each step of the control method of the ophthalmic apparatus according to any of the 18th to 28th aspects.

It is possible to arbitrarily combine the configurations according to the above-mentioned plurality of embodiments.

According to the present invention, it is possible to provide a new technique for acquiring a higher image quality image of an eye to be inspected with a simple configuration.

It is a schematic diagram which shows the structural example of the optical system of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the structural example of the optical system of the ophthalmic apparatus which concerns on 1st Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the structural example of the control system of the ophthalmic apparatus which concerns on 1st Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 1st Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 1st Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 2nd Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 2nd Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 3rd Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 3rd Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 4th Embodiment. It is operation | movement explanatory drawing of the ophthalmic apparatus which concerns on 4th Embodiment.

An example of an ophthalmic apparatus according to the present invention, a control method thereof, and an embodiment of a program will be described in detail with reference to the drawings. The contents of the document described in this specification can be appropriately used as the contents of the following embodiments.

The ophthalmologic apparatus according to the embodiment deflects slit-shaped illumination light using an optical scanner, irradiates (scans) the deflected illumination light to a predetermined portion of the eye to be inspected with the illumination light, and an opening range (position) on the light receiving surface. , Shape, etc.) receives the return light from a predetermined part using an image sensor that can be set arbitrarily. The control unit that controls the ophthalmic appliance is an optical scanner and an image sensor so that the irradiation range on the light receiving surface corresponding to the irradiation area of the illumination light overlaps with the aperture range in the predetermined imaging area set in the predetermined part of the eye to be inspected. To control. Further, the control unit controls the image sensor so as to acquire the light receiving result of the return light in the aperture range overlapping the irradiation range.

In some embodiments, the light receiving result of the return light obtained by the image sensor is read out by the global shutter method. In some embodiments, the light receiving result of the return light obtained by the image sensor is read out by a rolling shutter method.

In some embodiments, the predetermined site is the anterior or posterior eye. The anterior segment of the eye includes the cornea, iris, crystalline lens, ciliary body, and zonule of Zinn. The posterior eye portion includes the vitreous body, the fundus or the vicinity thereof (retina, choroid, sclera, etc.).

The method of controlling an ophthalmic appliance according to an embodiment includes one or more steps for realizing a process executed by a processor (computer) in the ophthalmologic apparatus according to the embodiment. The program according to the embodiment causes the processor to execute each step of the control method of the ophthalmologic apparatus according to the embodiment.

In the present specification, the "processor" is, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), a programmable logic device (for example, a SPLD (Simple It means a circuit such as Programmable Logic Device), FPGA (Field Programgable Gate Array)). The processor realizes the function according to the embodiment by reading and executing a program stored in a storage circuit or a storage device, for example.

Hereinafter, a case where the ophthalmologic apparatus according to the embodiment mainly acquires an image of the fundus of the eye to be inspected will be described.

<First Embodiment>
[Optical system configuration]
1 and 2 show schematic views of a configuration example of the ophthalmic apparatus according to the first embodiment. FIG. 1 shows a configuration example of an optical system of the ophthalmic apparatus 1 according to the first embodiment. FIG. 2 schematically shows a configuration example of the iris diaphragm 21 of FIG. 1 when viewed from the direction of the optical axis O. In FIGS. 1 and 2, similar parts are designated by the same reference numerals, and description thereof will be omitted as appropriate.

The ophthalmic apparatus 1 includes a light source 10, an illumination optical system 20, an optical scanner 30, a projection optical system 35, a photographing optical system 40, and an image pickup apparatus 50. In some embodiments, the illumination optical system 20 includes at least one of a light source 10, an optical scanner 30, and a projection optical system 35. In some embodiments, the photographing optical system 40 includes an image pickup device 50. In some embodiments, the projection optical system 35 or the photographing optical system 40 includes an optical scanner 30.

(Light source 10)
The light source 10 includes a visible light source that generates light in the visible region. For example, the light source 10 produces light having a central wavelength in the wavelength range of 420 nm to 700 nm. Such a light source 10 includes, for example, an LED (Light Emitting Diode), an LD (Laser Diode), a halogen lamp, or a xenon lamp. In some embodiments, the light source 10 includes a white light source or a light source capable of outputting light of each color component of RGB. In some embodiments, the light source 10 includes a light source capable of switching and outputting light in the infrared region or light in the visible region. The light source 10 is arranged at a position optically non-conjugated to each of the fundus Ef and the iris.

(Illumination optical system 20)
The illumination optical system 20 uses the light from the light source 10 to generate slit-shaped illumination light. The illumination optical system 20 guides the generated illumination light to the optical scanner 30.

The illumination optical system 20 includes an iris diaphragm 21, a slit 22, and a relay lens 23. The light from the light source 10 passes through the opening formed in the iris diaphragm 21, passes through the opening formed in the slit 22, and passes through the relay lens 23. The relay lens 23 includes one or more lenses. The light transmitted through the relay lens 23 is guided to the optical scanner 30.

(Iris diaphragm 21)
The iris diaphragm 21 (specifically, the opening described later) can be arranged at a position optically conjugate with the iris (pupil) of the eye E to be inspected. The iris diaphragm 21 is formed with one or more openings at positions away from the optical axis O. For example, as shown in FIG. 2, openings 21A and 21B are formed in the iris diaphragm 21. The openings 21A and 21B are formed line-symmetrically with respect to a straight line that passes through the position of the optical axis O and extends in a direction corresponding to the longitudinal direction of the slit 22. The shape of the inner diameters of the openings 21A and 21B is defined by a straight line connecting two points on the inner diameters of the openings 21A and 21B so that the distance in the direction corresponding to the lateral direction of the slit 22 does not change.

That is, each of the openings 21A and 21B has a circular segment shape. The bow is the area surrounded by the inferior arc of a circle or ellipse and the chords of this inferior arc. The direction of the bow-shaped strings is substantially parallel to the direction corresponding to the longitudinal direction of the opening formed in the slit 22.

The openings 21A and 21B formed in the iris diaphragm 21 define the incident position (incident shape) of the illumination light in the iris of the eye E to be inspected. For example, by forming the openings 21A and 21B as shown in FIG. 2, when the pupil center of the eye to be inspected E is arranged on the optical axis O, the position eccentric from the pupil center (specifically, the pupil center). It is possible to inject the illumination light into the eye from a position that is line-symmetrical with respect to the passing straight line.

In some embodiments, the iris diaphragm 21 is formed with openings 21A, 21B having a predetermined thickness along the circumferential direction centered on the optical axis O.

Further, by changing the relative position between the light source 10 and the opening formed in the iris diaphragm 21, it is possible to change the light amount distribution of the light passing through the opening formed in the iris diaphragm 21. ..

(Slit 22)
The slit 22 (specifically, the opening described later) can be arranged at a position optically conjugate with the fundus Ef of the eye E to be inspected. An opening is formed in the slit 22. The opening formed in the slit 22 defines the irradiation pattern of the illumination light in the fundus Ef of the eye E to be inspected. For example, the slit 22 is formed with an opening so that the longitudinal direction of the slit image on the light receiving surface of the image sensor 51, which will be described later, formed by the light passing through the opening is orthogonal to the moving direction of the opening range on the light receiving surface. Orthogonal.

The slit 22 can be moved in the optical axis direction of the illumination optical system 20 by a moving mechanism (moving mechanism 22D described later). The moving mechanism receives control from the control unit 100 described later and moves the slit 22 in the optical axis direction. For example, the control unit 100 controls the movement mechanism according to the state of the eye E to be inspected. As a result, the position of the slit 22 can be moved according to the state of the eye E to be inspected (specifically, the refractive power and the shape of the fundus Ef).

In some embodiments, the slit 22 is configured to be capable of changing at least one of the positions and shapes of the openings, depending on the condition of the eye E to be inspected, without being moved in the optical axis direction. Such a function of the slit 22 is realized by, for example, a liquid crystal shutter.

In some embodiments, the size, position, and shape of the opening formed in the slit 22 can be changed at least one.

The light from the light source 10 that has passed through the opening formed in the iris diaphragm 21 is output as slit-shaped illumination light by passing through the opening formed in the slit 22. The slit-shaped illumination light passes through the relay lens 23 and is guided to the optical scanner 30.

(Optical scanner 30)
The optical scanner 30 is arranged at a position substantially conjugate with the iris of the eye E to be inspected. The optical scanner 30 deflects the slit-shaped illumination light (slit-shaped light that has passed through the opening formed in the slit 22) that passes through the relay lens 23. Specifically, the optical scanner 30 changes the deflection angle within a predetermined deflection angle range with the iris of the eye E to be inspected or its vicinity as the scan center position, and changes the deflection angle within a predetermined deflection angle range, while changing the deflection angle within a predetermined illumination range (illumination light irradiation region) of the fundus Ef. ) Sequentially illuminate the slit-shaped illumination light and guide it to the projection optical system 35. The optical scanner 30 can deflect the illumination light one-dimensionally or two-dimensionally.

When one-dimensionally deflecting, the optical scanner 30 includes a galvano scanner that deflects the illumination light within a predetermined deflection angle range with respect to a predetermined deflection direction. For example, the optical scanner 30 deflects the illumination light so as to move in a direction orthogonal to (intersects) the longitudinal direction of the slit image formed by the illumination light in the fundus Ef of the eye to be inspected.

In the case of two-dimensional deflection, the optical scanner 30 includes a first galvano scanner and a second galvano scanner. The first galvano scanner deflects the illumination light so as to move the irradiation position of the illumination light in the horizontal direction orthogonal to the optical axis of the illumination optical system 20. The second galvano scanner deflects the illumination light deflected by the first galvano scanner so as to move the irradiation position of the illumination light in the direction perpendicular to the optical axis of the illumination optical system 20.

Scanning modes that move the irradiation position of the illumination light by the optical scanner 30 include, for example, horizontal scan, vertical scan, cross scan, radial scan, circular scan, concentric circular scan, spiral scan, and the like.

(Projection optical system 35)
The projection optical system 35 guides the illumination light deflected by the optical scanner 30 to the fundus Ef of the eye E to be inspected. In the embodiment, the projection optical system 35 guides the illumination light deflected by the optical scanner 30 to the fundus Ef through the optical path coupled to the optical path of the photographing optical system 40 by the hole mirror 45 as the optical path coupling member described later. ..

The projection optical system 35 includes a relay lens 41, a black dot plate 42, a reflection mirror 43, and a relay lens 44. Each of the relay lenses 41 and 44 includes one or more lenses.

(Black dot plate 42)
The black dot plate 42 is arranged at a position optically conjugate with the lens surface of the objective lens 46 or its vicinity. This makes it possible to prevent the reflected light from the lens surface of the objective lens 46 from being guided to the light source 10 (illumination optical system 20).

In such a projection optical system 35, the illumination light deflected by the optical scanner 30 passes through the relay lens 41, passes through the black dot plate 42, and is reflected by the reflection mirror 43 toward the hole mirror 45.

(Shooting optical system 40)
The photographing optical system 40 guides the illumination light guided by the projection optical system 35 to the fundus Ef of the eye E to be inspected, and guides the return light of the illumination light from the fundus Ef to the image pickup device 50.

In the photographing optical system 40, the optical path of the illumination light from the projection optical system 35 and the optical path of the return light of the illumination light from the fundus Ef are combined. By using the hole mirror 45 as the optical path coupling member for coupling these optical paths, it is possible to divide the illumination light and its return light into pupils.

The photographing optical system 40 includes a hole mirror 45, an objective lens 46, a focusing lens 47, a relay lens 48, and an imaging lens 49. Each of the relay lenses 48 includes one or more lenses.

(Hole mirror 45)
The hole mirror 45 is formed with a hole portion arranged on the optical axis of the photographing optical system 40. The hole portion of the hole mirror 45 is arranged at a position optically conjugate with the iris of the eye E to be inspected. The hole mirror 45 reflects the illumination light from the projection optical system 35 toward the objective lens 46 in the peripheral region of the hole. The hole mirror 45 functions as a shooting diaphragm.

(Focusing lens 47)
The focusing lens 47 can be moved in the optical axis direction of the photographing optical system 40 by a moving mechanism (not shown). The moving mechanism receives control from the control unit 100 described later and moves the focusing lens 47 in the optical axis direction. As a result, the return light of the illumination light that has passed through the hole portion of the hole mirror 45 can be imaged on the light receiving surface of the image sensor 51 of the image pickup apparatus 50 according to the state of the eye E to be inspected.

In such a photographing optical system 40, the illumination light from the projection optical system 35 is reflected toward the objective lens 46 in the peripheral region of the hole formed in the hole mirror 45. The illumination light reflected in the peripheral region of the hole mirror 45 is refracted by the objective lens 46 and enters the eye through the pupil of the eye E to be inspected to illuminate the fundus Ef of the eye E to be inspected.

The return light of the illumination light from the fundus Ef is refracted by the objective lens 46, passes through the hole portion of the hole mirror 45, passes through the focusing lens 47, passes through the relay lens 48, and is transmitted by the imaging lens 49. An image is formed on the light receiving surface of the image sensor 51 of 50.

(Image pickup device 50)
The image pickup apparatus 50 includes an image sensor 51 that receives the return light of the illumination light guided from the fundus Ef of the eye E to be inspected through the photographing optical system 40. The image pickup apparatus 50 can output the light receiving result of the return light under the control of the control unit 100 described later.

(Image sensor 51)
The image sensor 51 realizes a function as a pixelated light receiver. The light receiving surface (detection surface, imaging surface) of the image sensor 51 can be arranged at a position optically conjugate with the fundus Ef.

The position and shape of the opening range on the light receiving surface of the image sensor 51 can be arbitrarily set under the control of the control unit 100 described later. For example, by changing the position of the aperture range according to the position of the irradiation area of the illumination light in the fundus Ef, it is possible to obtain the light receiving result of the return light from the irradiation area without being affected by unnecessary scattered light. .. For example, by reducing the size of the aperture range, the frame period, which is the period during which the light receiving result of the return light in the light receiving element within the aperture range is captured, is shortened.

The light receiving result obtained by the light receiving element within the aperture range of the image sensor 51 is captured and read by the global shutter method. That is, the exposure start timings and the exposure end timings match for all the light receiving elements within the aperture range of the image sensor 51. Examples of such an image sensor 51 include known image sensors such as a CCD (Charge Coupled Device) image sensor and a CMOS (Complementary Metal Oxside Semiconductor) image sensor. In some embodiments, the control unit 100, which will be described later, controls the reading of the light receiving result by controlling the image sensor 51.

FIG. 3 shows an operation explanatory diagram of the ophthalmic apparatus 1 according to the first embodiment. FIG. 3 schematically shows the irradiation region IP of the slit-shaped illumination light applied to the fundus Ef and the virtual opening range OP in the light receiving surface SR of the image sensor 51.

For example, the control unit 100, which will be described later, uses an optical scanner 30 to deflect the slit-shaped illumination light formed by the illumination optical system 20. As a result, in the fundus Ef, which is the imaging region, the irradiation region IP of the slit-shaped illumination light is sequentially moved (shifted) in a direction (for example, a vertical direction) orthogonal to the slit direction (for example, the horizontal direction).

In the light receiving surface SR of the image sensor 51, for example, the control unit 100 described later changes the position of the opening range OP to be captured as the light receiving result of the return light from the fundus Ef. At this time, the position (or position and shape) of the opening range OP is set according to the position of the irradiation region IP of the illumination light in the fundus Ef. Specifically, the control unit 100, which will be described later, controls the optical scanner 30 and the image sensor 51 so that the irradiation range IP'on the light receiving surface SR corresponding to the irradiation region IP of the illumination light in the fundus Ef overlaps with the aperture range OP. do. In other words, the control unit 100, which will be described later, sets the optical scanner 30 and the image sensor 51 so that the irradiation region IP of the illumination light in the fundus Ef overlaps the aperture target region in the fundus Ef corresponding to the aperture range OP in the light receiving surface SR. Control. It is desirable that the aperture range OP is a range that matches the irradiation range IP'of the return light of the illumination light on the light receiving surface SR, or a range wider than the irradiation range IP'. For example, the control unit 100, which will be described later, executes the movement control of the aperture range OP with respect to the image sensor 51 in synchronization with the movement control of the irradiation area IP of the illumination light with respect to the optical scanner 30. As a result, it is possible to acquire a high-quality image of the fundus Ef having a strong contrast with a simple configuration without being affected by unnecessary scattered light.

In FIG. 3, the control unit 100, which will be described later, moves the irradiation range IP'on the light receiving surface SR by controlling the optical scanner 30. The control unit 100, which will be described later, controls the image sensor 51 in conjunction with the movement of the irradiation range IP'to move the opening range OP so as to overlap the irradiation range IP' after the movement. In some embodiments, the control unit 100, which will be described later, moves the opening range OP by controlling the image sensor 51. The control unit 100, which will be described later, controls the optical scanner 30 in conjunction with the movement of the opening range OP, so that the irradiation range IP'overlaps the opening range OP after the movement, and the fundus Ef corresponding to the irradiation range IP' Move the irradiation area in.

[Control system configuration]
FIG. 4 shows a block diagram of a configuration example of the control system (processing system) of the ophthalmic apparatus 1 according to the first embodiment.

The control system of the ophthalmic apparatus 1 is configured around the control unit 100. In addition, at least a part of the configuration of the control system may be included in the ophthalmic apparatus 1.

(Control unit 100)
The control unit 100 controls each unit of the ophthalmic apparatus 1. The control unit 100 includes a main control unit 101 and a storage unit 102. The main control unit 101 includes a processor and executes processing according to a program stored in the storage unit 102 to execute control processing of each unit of the ophthalmic apparatus 1.

(Main control unit 101)
The main control unit 101 controls the light source 10, the movement mechanism 10D, the illumination optical system 20, the optical scanner 30, the photographing optical system 40, the image pickup device 50, and the data processing unit 200. Controls.

The control of the light source 10 includes switching on and off (or a wavelength region of light) of the light source, control of the lighting time, and control of changing the amount of light of the light source.

The moving mechanism 10D changes at least one of the positions and orientations of the light source 10 by a known mechanism. The main control unit 101 can change at least one of the relative position and the relative direction of the light source 10 with respect to the iris diaphragm 21 and the slit 22.

The control of the illumination optical system 20 includes the control of the moving mechanism 22D. The moving mechanism 22D moves the slit 22 in the optical axis direction of the illumination optical system 20. The main control unit 101 controls the movement mechanism 22D according to the state of the eye to be inspected E, thereby arranging the slit 22 at a position corresponding to the state of the eye to be inspected E. The state of the eye to be inspected E includes the shape of the fundus Ef, the refractive power, the axial length, and the like. The refractive power can be obtained from a known ocular refractive power measuring device as disclosed in, for example, Japanese Patent Application Laid-Open No. 61-293430 or Japanese Patent Application Laid-Open No. 2010-259495. The axial length can be obtained from a known axial length measuring device or a measured value of an optical coherence tomography.

For example, first control information in which the position of the slit 22 in the optical axis of the illumination optical system 20 is previously associated with the degree of refraction is stored in the storage unit 102. The main control unit 101 specifies the position of the slit 22 corresponding to the refractive power with reference to the first control information, and controls the moving mechanism 22D so that the slit 22 is arranged at the specified position.

Here, as the slit 22 moves, the light amount distribution of the light passing through the opening formed in the slit 22 changes. At this time, as described above, the main control unit 101 can change the position and orientation of the light source 10 by controlling the moving mechanism 10D.

In some embodiments, the main control unit 101 modifies at least one of the shape, position, and size of the opening formed in the slit 22.

The control of the optical scanner 30 includes the control of the angle of the deflection surface that deflects the illumination light. By controlling the angle range of the deflection surface, it is possible to control the scan range (scan start position and scan end position). It is possible to control the scanning speed by controlling the changing speed of the angle of the deflection surface.

In some embodiments, the main control unit 101 controls the optical scanner 30 so that the deflection angle of the deflection surface of the optical scanner 30 scans the irradiation region in the fundus Ef with illumination light at a predetermined deflection angle.

In some embodiments, the main control unit 101 deflects the slit-shaped illumination light by controlling the optical scanner 30, and changes the position (or position and shape) of the irradiation area of the illumination light in the fundus Ef. In some embodiments, the main control unit 101 changes the position (or position) of the illumination region of the fundus Ef by changing at least one of the shape, position, and size of the opening formed in the slit 22. Change the position and shape). In some embodiments, the main control unit 101 changes the position (or position and shape) of the irradiation area of the illumination light in the fundus Ef by controlling each of the slit 22 and the optical scanner 30 as described above. ..

In some embodiments, the main control unit 101 changes the irradiation time of the illumination light to the fundus Ef by controlling at least one of the light source 10 and the optical scanner 30.

The control of the photographing optical system 40 includes the control of the moving mechanism 47D. The moving mechanism 47D moves the focusing lens 47 in the optical axis direction of the photographing optical system 40. The main control unit 101 can control the movement mechanism 47D based on the analysis result of the image acquired by using the image sensor 51. Further, the main control unit 101 can control the movement mechanism 47D based on the operation content of the user using the operation unit 110 described later.

The control of the image pickup apparatus 50 includes the control of the image sensor 51. The control of the image sensor 51 includes the setting of the aperture range on the light receiving surface and the control for reading the light receiving result by the global shutter method.

The main control unit 101 changes the position (or arrangement and shape) of the opening range on the light receiving surface of the image sensor 51 in synchronization with the movement of the irradiation region of the illumination light in the fundus Ef.

In some embodiments, the main control unit 101 identifies the position of the irradiation area of the illumination light in the fundus Ef based on the deflection angle of the optical scanner 30, and the irradiation area or the image sensor 51 is determined based on the position. Control the opening range. In this case, the position or size (width) of the irradiation area (irradiation range) or the opening range, the irradiation time of the illumination light, or the opening time of the opening range is changed. The deflection angle of the optical scanner 30 can be specified based on the detection result obtained by a separately provided angle detector or the signal representing the deflection state from the optical scanner 30.

In some embodiments, the main control unit 101 corresponds to the control content for each range based on the sequence information representing the control content for each range obtained by dividing the predetermined deflection angle range of the optical scanner 30. The control is executed for the optical scanner 30 and the image sensor 51.

The control of the data processing unit 200 includes various image processing and analysis processing for the light receiving result acquired from the image sensor 51. The image processing includes noise reduction processing for the light receiving result and luminance correction processing for making it easy to identify a predetermined portion drawn on the light receiving image based on the light receiving result. The analysis process includes a process for specifying the in-focus state.

The data processing unit 200 can form a light receiving image corresponding to the aperture range based on the light receiving result read from the image sensor 51 by the global shutter method. As the image forming unit, the data processing unit 200 can sequentially form light receiving images corresponding to the aperture range, and can form an image of the eye E to be inspected from the formed plurality of light receiving images.

The data processing unit 200 includes a processor and realizes the above functions by performing processing according to a program stored in a storage unit or the like.

In some embodiments, the light source 10 comprises two or more light sources. In this case, each of the two or more light sources is provided corresponding to the two or more openings formed in the iris diaphragm 21. The main control unit 101 changes at least one of the positions and orientations (directions in the direction in which the amount of light distribution is maximized) of each light source by controlling the movement mechanism provided corresponding to each of the two or more light sources. It is possible to do.

(Storage 102)
The storage unit 102 stores various computer programs and data. The computer program includes an arithmetic program and a control program for controlling the ophthalmic apparatus 1.

(Operation unit 110)
The operation unit 110 includes an operation device or an input device. The operation unit 110 includes buttons and switches (for example, an operation handle, an operation knob, etc.) provided on the ophthalmic apparatus 1 and an operation device (mouse, keyboard, etc.). Further, the operation unit 110 may include any operation device or input device such as a trackball, an operation panel, a switch, a button, and a dial.

(Display unit 120)
The display unit 120 displays an image of the eye E to be inspected generated by the data processing unit 200. The display unit 120 includes a display device such as a flat panel display such as an LCD (Liquid Crystal Display). Further, the display unit 120 may include various display devices such as a touch panel provided on the housing of the ophthalmic apparatus 1.

The operation unit 110 and the display unit 120 do not need to be configured as separate devices. For example, it is also possible to use a device such as a touch panel in which a display function and an operation function are integrated. In that case, the operation unit 110 includes the touch panel and a computer program. The operation content for the operation unit 110 is input to the control unit 100 as an electric signal. Further, the graphical user interface (GUI) displayed on the display unit 120 and the operation unit 110 may be used to perform operations and information input. In some embodiments, the functions of the display unit 120 and the operation unit 110 are realized by a touch screen.

(Other configurations)
In some embodiments, the ophthalmic apparatus 1 further comprises a fixative projection system. For example, the optical path of the fixative projection system is coupled to the optical path of the photographing optical system 40 in the configuration of the optical system shown in FIG. The fixative projection system is capable of presenting an internal fixative or an external fixative to the eye E to be inspected. When the internal fixative is presented to the eye E to be inspected, the fixative projection system includes an LCD that displays the internal fixative under the control of the control unit 100, and the fixative light flux output from the LCD is used for the eye to be inspected. Project on the fundus of E. The LCD is configured so that the display position of the fixative on the screen can be changed. By changing the display position of the fixative on the LCD, it is possible to change the projection position of the fixative on the fundus of the eye E to be inspected. The display position of the fixative on the LCD can be specified by the user by using the operation unit 110.

In some embodiments, the ophthalmic apparatus 1 comprises an alignment system. In some embodiments, the alignment system includes an XY alignment system and a Z alignment system. The XY alignment system is used to align the device optical system and the eye E to be inspected in a direction intersecting the optical axis of the device optical system (objective lens 46). The Z alignment system is used to align the device optical system and the eye E to be inspected in the direction of the optical axis of the ophthalmic device 1 (objective lens 46).

For example, the XY alignment system projects a bright spot (bright spot in an infrared region or a near infrared region) on the eye E to be inspected. The data processing unit 200 acquires an anterior eye portion image of the eye E to be inspected on which a bright spot is projected, and obtains a displacement between the bright spot image drawn on the acquired anterior eye portion image and the alignment reference position. The control unit 100 relatively moves the device optical system and the eye E to be inspected in a direction intersecting the direction of the optical axis by a movement mechanism (not shown) so as to cancel the obtained displacement.

For example, the Z alignment system projects the alignment light in the infrared region or the near infrared region from a position off the optical axis of the device optical system, and receives the alignment light reflected by the anterior eye portion of the eye E to be inspected. The data processing unit 200 specifies the distance of the eye to be inspected E to the optical system of the apparatus from the light receiving position of the alignment light which changes according to the distance of the eye to be inspected E to the optical system of the apparatus. The control unit 100 relatively moves the device optical system and the eye E to be inspected in the direction of the optical axis by a movement mechanism (not shown) so that the specified distance becomes a desired working distance.

In some embodiments, the function of the alignment system is achieved by two or more anterior ocular cameras located off the optical axis of the device optical system. For example, as disclosed in Japanese Patent Application Laid-Open No. 2013-248376, the data processing unit 200 analyzes the anterior eye portion image of the eye E to be inspected substantially simultaneously acquired by two or more anterior eye region cameras. , The three-dimensional position of the eye E to be inspected is specified by using a known triangular method. The control unit 100 uses a moving mechanism (not shown) so that the optical axis of the device optical system substantially coincides with the axis of the eye to be inspected E and the distance of the device optical system to the eye to be inspected E is a predetermined operating distance. And the eye E to be inspected are relatively moved three-dimensionally.

As described above, in the ophthalmic appliance 1, the slit 22 (opening), the photographing portion (fundus Ef), and the image sensor 51 (light receiving surface) are arranged at positions substantially conjugate with each other. The ophthalmic appliance 1 moves the irradiation range on the light receiving surface of the image sensor 51 corresponding to the irradiation region of the illumination light in the fundus Ef and the aperture range in conjunction with each other. That is, the ophthalmic appliance 1 moves the irradiation area of the illumination light in the fundus Ef and the aperture target area in the fundus Ef corresponding to the opening range of the light receiving surface of the image sensor 51 in conjunction with each other. As a result, it becomes possible to acquire a clear image of the imaged portion while suppressing the influence of unnecessary scattered light.

The data processing unit 200 is an example of the "image forming unit" according to the embodiment.

[motion]
Next, the operation of the ophthalmic apparatus 1 will be described. In the following operation example, it is assumed that the alignment is completed and the movement of the slit 22 is completed according to the refractive power of the eye E to be inspected. Further, in the following, as an imaging area (fundus photography target area), a deflection angle range of ± 22.5 ° with respect to the scan center will be described as an example, but even if the deflection angle range is wider than ± 22.5 °. Alternatively, the deflection angle range narrower than ± 22.5 ° may be used.

(First operation example)
FIG. 5A shows an explanatory diagram of a first operation example of the ophthalmic apparatus 1 according to the first embodiment. In FIG. 5A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region (fundus imaging target region) in the fundus Ef, and the horizontal axis represents the time axis. The position where the deflection angle is 0 ° corresponds to the position where the optical axis of the illumination optical system 20 (shooting optical system 40) intersects the fundus Ef after the alignment is completed.

In the first operation example, during one frame period in which the light receiving result of the opening range is captured by the image sensor 51, the shooting area R _IMG covers the shooting area R IMG so that the opening target area in the fundus Ef corresponding to the opening range covers the shooting area R _IMG . Is illuminated with a slit-shaped illumination light. For example, the one-frame period corresponds to the sum of the opening time at which the opening range opens and the data transmission time at which the light receiving result of the opening range is transmitted. Specifically, the control unit 100 scans (moves) the imaging region _RIMG in the range of + 22.5 ° to -22.5 ° in the fundus Ef so that the irradiation region of the illumination light scans (moves) at a constant speed. 30 is controlled.

In the image sensor 51, the opening range having a predetermined opening width and opening for a predetermined opening time is sequentially moved according to the movement of the irradiation area in the photographing area _RIMG . Specifically, the control unit 100 imagines that the opening range having the opening width Wd1 is opened for a predetermined opening time so as to overlap the irradiation range ILR1 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef. The sensor 51 is sequentially controlled.

Here, since the distance between the ophthalmic apparatus 1 and the eye to be inspected at the time of photographing and the optical magnification of the optical system of the ophthalmic apparatus 1 are known, the imaging target position in the imaging region _RIMG is determined from the deflection angle of the optical scanner 30. It is identifiable. That is, the control unit 100 that controls the optical scanner 30 can specify the position of the imaging target corresponding to the deflection angle of the optical scanner 30 and the position of the irradiation range ILR1 on the light receiving surface.

For example, when the deflection angle range is DR1 (= + 22.5 ° to + (22.5-f (Wd1)) °), the control unit 100 sets the opening width at the position of the light receiving surface corresponding to the deflection angle range DR1. The image sensor 51 is set so that the opening range OR1 having Wd1 is opened for a predetermined opening time. Here, f (Wd1) is the deflection of the optical scanner 30 when the deflection angle is deflected in the direction of 0 ° from the position of the imaging target region corresponding to 22.5 ° only at the position corresponding to the aperture width Wd1 on the light receiving surface. Corresponds to the angle.

Similarly, when the deflection angle range is DR2 (= (22.5-f (Wd1)) ° to (22.5-f (Wd1 × 2))), the control unit 100 receives light receiving light corresponding to the deflection angle range DR2. The image sensor 51 is set at the position of the surface so that the opening range OR2 having the opening width Wd1 opens for a predetermined opening time.

The control unit 100 reads out the light receiving result obtained by the light receiving element having the aperture range OR1 by the global shutter method. The control unit 100 causes the data processing unit 200 to form an image of one frame of the fundus Ef by using the light receiving result obtained by the light receiving element in the range overlapping the irradiation range ILR1 among the read light receiving results.

According to the first operation example of the first embodiment, the aperture range on the light receiving surface of the image sensor 51, which can read the light receiving result by the global shutter method, can be moved according to the irradiation region of the illumination light in the fundus Ef. This makes it possible to acquire a clear image of the imaged part while suppressing the influence of unnecessary scattered light with a simple configuration using an image sensor that can read out the light reception result by the global shutter method.

In the first embodiment, one frame period corresponds to the image acquisition period _TIMG , and the image acquisition period can be shortened. Therefore, it is possible to acquire a high-quality image of the fundus Ef while reducing the burden on the eye to be inspected.

(Second operation example)
FIG. 5B shows an explanatory diagram of a second operation example of the ophthalmic apparatus 1 according to the first embodiment. In FIG. 5B, as in FIG. 5A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the second operation example, an aperture range having a different aperture width is set according to the irradiation range of the illumination light. In this case, the control unit 100 irradiates the imaging region R _IMG in the range of + 22.5 ° to -22.5 ° in the fundus Ef with illumination light at a deflection speed (scanning speed) corresponding to the position of the imaging region R _IMG . The optical scanner 30 is controlled so that the area is scanned (moved). Further, the control unit 100 opens the image sensor 51 so that the opening range having a desired opening width overlaps with the irradiation range ILR11 on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef for a predetermined opening time. Is controlled sequentially.

For example, when the deflection angle range is the above DR1, the control unit 100 controls the optical scanner 30 so as to deflect the illumination light at a deflection speed corresponding to the deflection angle range DR1. Further, the control unit 100 controls the image sensor 51 so that the opening range having the opening width Wd1 is opened for a predetermined opening time at the position of the light receiving surface corresponding to the deflection angle range DR1.

For example, when the deflection angle range is the above DR2, the control unit 100 controls the optical scanner 30 so as to deflect the illumination light at a deflection speed corresponding to the deflection angle range DR2. Further, the control unit 100 controls the image sensor 51 so that the opening range having the opening width Wd2 is opened for a predetermined opening time at the position of the light receiving surface corresponding to the deflection angle range DR2.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the scanning of the photographing region _RIMG in the fundus Ef is completed by the illumination light, the control unit 100 receives the light receiving result obtained by the light receiving element of the aperture range OR11. Read with the global shutter method. The control unit 100 causes the data processing unit 200 to form an image of one frame of the fundus Ef by using the light receiving result obtained by the light receiving element in the range overlapping the irradiation range ILR11 among the read light receiving results.

For example, the storage unit 102 stores second control information in which the deflection speed of the optical scanner 30 and the aperture width of the aperture range are previously associated with each other corresponding to the deflection angle range (shooting target position). The control unit 100 controls the optical scanner 30 so as to deflect the illumination light at a deflection speed corresponding to the imaging target position with reference to the second control information, and has an aperture width corresponding to the imaging target position. It is possible to control the image sensor 51 so as to set the aperture range.

As described above, the control unit 100 controls the optical scanner 30 so as to deflect the illumination light at a deflection speed corresponding to the position of the irradiation area of the illumination light in the fundus Ef, and the aperture width corresponding to the position of the irradiation area. The image sensor 51 is controlled so as to set the opening range having the light. In some embodiments, an aperture range is set that opens at different aperture times depending on the position of the irradiation area of the illumination light on the fundus Ef.

According to the second operation example of the first embodiment, the aperture range on the light receiving surface of the image sensor 51, which can read the light receiving result by the global shutter method, can be moved according to the irradiation area of the illumination light in the fundus Ef. .. At this time, since the aperture range can be sequentially set so that the aperture width is different, the moving speed (scanning speed) of the irradiation region in the fundus Ef can be changed. This means that the amount of illumination light can be adjusted according to the position to be photographed. As a result, the entire shooting area can be illuminated with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). Therefore, it becomes possible to acquire a higher image quality image of the fundus Ef.

<Second Embodiment>
In the second embodiment, the irradiation region of the illumination light in the fundus Ef or the aperture target area in the fundus Ef corresponding to the aperture range is changed for each frame period in which the light receiving result of the aperture range is captured by the image sensor 31, and two or more. The optical scanner 30 and the image sensor 51 are controlled so that the aperture target area covers the photographing area _RIMG over the frame period.

Hereinafter, the ophthalmic apparatus according to the second embodiment will be described focusing on the differences from the ophthalmic apparatus according to the first embodiment.

Each of the configuration of the optical system and the configuration of the control system of the ophthalmic apparatus according to the second embodiment is the same as the configuration of the optical system and the configuration of the control system of the ophthalmic apparatus 1 according to the first embodiment.

(First operation example)
FIG. 6A shows an explanatory diagram of a first operation example of the ophthalmic apparatus according to the second embodiment. In FIG. 6A, as in FIG. 5A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the first operation example, the irradiation range on the light receiving surface is changed and the opening range is changed so as to overlap the changed irradiation range for each frame period in which the light receiving result of the opening range is captured by the image sensor 51. Irradiation. Specifically, the control unit 100 scans (moves) the irradiation region of the illumination light at a constant speed for each predetermined range obtained by dividing + 22.5 ° to -22.5 ° in the fundus Ef. Then, the optical scanner 30 is controlled so that the irradiation area of the illumination light covers the photographing area _RIMG over two or more frames.

In the image sensor 51, the opening range having a predetermined opening width and opening for a predetermined opening time is sequentially moved according to the movement of the irradiation area in the photographing area _RIMG . Specifically, the control unit 100 imagines that the opening range having the opening width Wd1 is opened for a predetermined opening time so as to overlap the irradiation range ILR1 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef. The sensor 51 is sequentially controlled.

For example, when the deflection angle range is the above DR1, the control unit 100 controls the optical scanner 30 so as to illuminate the imaging target area corresponding to the deflection angle range DR1 with illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR21 so as to overlap the irradiation range ILR 21 on the light receiving surface corresponding to the irradiation region of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR1 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR1. The image sensor 51 is controlled so that the opening range has a predetermined opening time.

Similarly, for example, when the deflection angle range is the above DR2, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR2 with the illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR22 so as to overlap the irradiation range ILR22 on the light receiving surface corresponding to the irradiation area of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR2 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR2. The image sensor 51 is controlled so that the opening range has a predetermined opening time.

Similarly, for example, when the deflection angle range is the above DR3, the control unit 100 controls the optical scanner 30 so as to illuminate the imaging target area corresponding to the deflection angle range DR3 with illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR23 so as to overlap the irradiation range ILR23 on the light receiving surface corresponding to the irradiation area of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR3 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR3. The image sensor 51 is controlled so that the opening range has a predetermined opening time.

The control unit 100 reads out the light-receiving result obtained by the light-receiving element in the aperture range OR21 in the deflection angle range DR1 by the global shutter method, and is obtained by the light-receiving element in the range of the read light-receiving results that overlaps with the irradiation range ILR21. The image of the fundus Ef is formed in the data processing unit 200 by using the received light receiving result.

Similarly, the control unit 100 reads out the light receiving result obtained by the light receiving element of the aperture range OR22 (OR23) in the deflection angle range DR2 (DR3) by the global shutter method, and among the read light receiving results, the irradiation range ILR22 ( An image of the fundus Ef is formed in the data processing unit 200 by using the light receiving result obtained by the light receiving element in the range overlapping the ILR23).

The formation of the image in each of the above frames may be performed in parallel with the light reception in the other frames.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the irradiation (scanning) of the photographing region _RIMG in the fundus Ef with the illumination light is completed, the control unit 100 synthesizes the images formed for each frame. As a result, the data processing unit 200 is formed with an image of the fundus Ef in which the entire imaging region _RIMG is depicted.

According to the first operation example of the second embodiment, the aperture range on the light receiving surface of the image sensor 51 capable of reading the light receiving result by the global shutter method is set for each frame period according to the irradiation area of the illumination light in the fundus Ef. Can be moved. At this time, in the second embodiment, the image acquisition period _TIMG can be shortened as compared with the first embodiment. As a result, with a simple configuration using an image sensor that can read out the light reception result by the global shutter method, the imaged part is clear while suppressing the effect of unnecessary scattered light and the effect of fixative tremor of the eye to be inspected. It becomes possible to acquire an image.

(Second operation example)
FIG. 6B shows an explanatory diagram of a second operation example of the ophthalmic apparatus according to the second embodiment. In FIG. 6B, similarly to FIG. 6A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the second operation example, an aperture range having a different aperture width is set according to the irradiation range of the illumination light for each frame period. In this case, the control unit 100 shifts the imaging region R _{IMG in the range of + 22.5 ° to -22.5 ° in the fundus Ef to the deflection speed (scanning speed) corresponding to the position of the imaging region R IMG for} each frame period. The optical scanner 30 is controlled so that the irradiation area of the illumination light is scanned (moved). Further, the control unit 100 opens an opening range having a desired opening width for a predetermined opening time so as to overlap the irradiation range on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef for each frame period. The image sensor 51 is sequentially controlled.

For example, when the deflection angle range is DR1, the control unit 100 controls the optical scanner so as to deflect the illumination light at a deflection speed corresponding to the deflection angle range DR1. Further, the control unit 100 increases the image sensor 51 so that the opening range OR31 having the opening width Wd1 is opened for a predetermined opening time so as to overlap the irradiation range ILR31 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef. To control.

For example, when the deflection angle range is DR2, the control unit 100 controls the optical scanner so as to deflect the illumination light at a deflection speed corresponding to the deflection angle range DR2. Further, the control unit 100 increases the image sensor 51 so that the opening range OR32 having the opening width Wd2 is opened for a predetermined opening time so as to overlap the irradiation range ILR32 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef. To control.

Similarly, for example, when the deflection angle range is DR3, the control unit 100 controls the optical scanner so as to deflect the illumination light at a deflection speed corresponding to the deflection angle range DR3. Further, the control unit 100 opens an opening range OR 33 having an opening width Wd3 (not shown) so as to overlap the irradiation range ILR 33 on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef for a predetermined opening time. The image sensor 51 is controlled in such a manner.

The control unit 100 reads out the light receiving results obtained by the light receiving elements of the aperture ranges OR31, OR32, OR33, ... By the global shutter method, and uses the light receiving elements in the range of the read light receiving results that overlaps the irradiation range. Using the obtained light receiving result, an image of the fundus Ef is formed in the data processing unit 200. The formation of the image in each frame may be performed in parallel with the light reception in the other frames.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the irradiation (scanning) of the photographing region _RIMG in the fundus Ef with the illumination light is completed, the control unit 100 synthesizes the images formed for each frame. As a result, the data processing unit 200 is formed with an image of the fundus Ef in which the entire imaging region _RIMG is depicted.

For example, the storage unit 102 stores third control information in which the deflection speed of the optical scanner 30 and the aperture width of the aperture range are previously associated with each other corresponding to the deflection angle range (shooting target position). The control unit 100 controls the optical scanner 30 so as to deflect the illumination light at a deflection speed corresponding to the imaging target position with reference to the third control information, and has an aperture width corresponding to the imaging target position. It is possible to control the image sensor 51 so as to set the aperture range.

As described above, the control unit 100 controls the optical scanner 30 so as to deflect the illumination light at a deflection speed corresponding to the position of the irradiation light irradiation region in the fundus Ef for each frame period, and the position of the irradiation region. The image sensor 51 is controlled so as to set an opening range having an opening width corresponding to the above. In some embodiments, an aperture range is set that opens at different aperture times depending on the position of the irradiation area of the illumination light on the fundus Ef.

According to the second operation example of the second embodiment, the aperture range on the light receiving surface of the image sensor 51 capable of reading the light receiving result by the global shutter method can be moved according to the irradiation area of the illumination light in the fundus Ef. .. At this time, since the aperture range can be sequentially set so that the aperture width is different, the moving speed (scanning speed) of the irradiation region in the fundus Ef can be changed. This means that the amount of illumination light can be adjusted according to the position to be photographed. As a result, the entire shooting area can be illuminated with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). Therefore, it becomes possible to acquire a higher image quality image of the fundus Ef.

<Third Embodiment>
In the third embodiment, the irradiation region of the illumination light in the fundus Ef or the aperture target area in the fundus Ef corresponding to the aperture range is changed for each frame period in which the light receiving result of the aperture range is captured by the image sensor 31, and two or more. The optical scanner 30 and the image sensor 51 are controlled so that the aperture target area covers the photographing area _RIMG over the frame period. The third embodiment differs from the second embodiment in that the optical scanner 30 and the image sensor 51 are controlled so that the irradiation range of the illumination light coincides with the aperture range on the light receiving surface of the image sensor 51.

Hereinafter, the ophthalmic apparatus according to the third embodiment will be described focusing on the differences from the ophthalmic apparatus according to the second embodiment.

Each of the configuration of the optical system and the configuration of the control system of the ophthalmic apparatus according to the third embodiment is the configuration and control of the optical system of the ophthalmic apparatus according to the second embodiment (that is, the ophthalmic apparatus 1 according to the first embodiment). It is similar to the structure of the system.

(First operation example)
FIG. 7A shows an explanatory diagram of a first operation example of the ophthalmic apparatus according to the third embodiment. In FIG. 7A, as in FIG. 6A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the first operation example, the irradiation range on the light receiving surface is changed for each frame period in which the light receiving result of the opening range is captured by the image sensor 51, and the changed irradiation range (position of the irradiation range or the irradiation range) is changed. The opening range is changed to match the position and shape). Specifically, the control unit 100 irradiates a fixed irradiation region with illumination light for each predetermined range obtained by dividing + 22.5 ° to -22.5 ° in the fundus Ef, and 2 or more. The optical scanner 30 is controlled so that the irradiation area of the illumination light covers the photographing area _RIMG over the frame.

In the image sensor 51, the aperture range having a predetermined aperture width and opening for a predetermined opening time is sequentially moved according to the position of the irradiation region in the imaging region _RIMG that is changed for each frame. Specifically, the control unit 100 is an image sensor so that the opening range having the opening width Wd1 is opened for a predetermined opening time so as to match the irradiation range on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef. 51 is sequentially controlled.

For example, when the deflection angle range is the above DR1, the control unit 100 controls the optical scanner 30 so as to irradiate (scan) the imaging target area corresponding to the deflection angle range DR1 with the illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR 41 so as to match the irradiation range IL 41 on the light receiving surface corresponding to the irradiation region of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR1 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR1. The image sensor 51 is controlled so that the opening range OR 41 having an opening range OR 41 opens for a predetermined opening time.

For example, when the deflection angle range is the above DR2, the control unit 100 controls the optical scanner 30 so as to illuminate the imaging target area corresponding to the deflection angle range DR2 with the illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR 42 so as to match the irradiation range ILR 42 on the light receiving surface corresponding to the irradiation region of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR2 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR2. The image sensor 51 is controlled so that the opening range OR 42 having the opening range OR 42 opens for a predetermined opening time.

Similarly, for example, when the deflection angle range is the above DR3, the control unit 100 controls the optical scanner 30 so as to illuminate the imaging target area corresponding to the deflection angle range DR3 with illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR43 so as to overlap the irradiation range ILR43 on the light receiving surface corresponding to the irradiation area of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR3 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR3. The image sensor 51 is controlled so that the opening range OR43 having the opening range OR43 opens for a predetermined opening time.

The control unit 100 reads out the light receiving result obtained by the light receiving element having the aperture range OR 41 in the deflection angle range DR1 by the global shutter method, and forms an image of the fundus Ef in the data processing unit 200 using the read light receiving result. Let me.

Similarly, the control unit 100 reads out the light-receiving result obtained by the light-receiving element in the aperture range OR42 (OR43) in the deflection angle range DR2 (DR3) by the global shutter method, and uses the read light-receiving result to fundus Ef. The image of is formed in the data processing unit 200. The formation of the image in each frame may be performed in parallel with the light reception in the other frames.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the irradiation (scanning) of the photographing region _RIMG in the fundus Ef with the illumination light is completed, the control unit 100 synthesizes the images formed for each frame. As a result, the data processing unit 200 is formed with an image of the fundus Ef in which the entire imaging region _RIMG is depicted.

According to the first operation example of the third embodiment, the aperture range on the light receiving surface of the image sensor 51 capable of reading the light receiving result by the global shutter method is set for each frame period according to the irradiation area of the illumination light in the fundus Ef. Can be moved. At this time, in the third embodiment, since the irradiation range and the aperture range are the same, the image can be acquired by a simple process as compared with the second embodiment. As a result, with a simple configuration and processing using an image sensor that can read out the light reception result by the global shutter method, while suppressing the influence of unnecessary scattered light and the influence of fixative tremor of the eye to be inspected, the imaged part can be affected. It becomes possible to acquire a clear image. In addition, it is possible to eliminate the need for repeated imaging due to the fixative tremor of the eye to be inspected, distortion correction processing due to the fixative tremor, and the like.

(Second operation example)
FIG. 7B shows an explanatory diagram of a second operation example of the ophthalmic apparatus according to the third embodiment. In FIG. 7B, similarly to FIG. 7A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the second operation example, an opening range is set for each frame period in which the illumination light is irradiated for the irradiation time corresponding to the irradiation area of the illumination light in the fundus Ef and the aperture is opened for the opening time corresponding to the irradiation area of the illumination light. Will be done. In this case, the control unit 100 shifts the imaging region R _{IMG in the range of + 22.5 ° to -22.5 ° in the fundus Ef to the deflection speed (scanning speed) corresponding to the position of the imaging region R IMG for} each frame period. The optical scanner 30 is controlled so that the irradiation area of the illumination light is scanned (moved). At this time, the irradiation time of the illumination light is changed according to the irradiation area. Further, the control unit 100 matches the irradiation range on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef for each frame period, and the opening range having a predetermined opening width is only the opening time corresponding to the irradiation area. The image sensor 51 is sequentially controlled so as to open. That is, the opening time of the opening range is set to match the irradiation time of the illumination light.

For example, when the deflection angle range is the above DR1, the control unit 100 controls the optical scanner 30 (or the light source 10 and the optical scanner 30) to control the deflection angle range DR1 by the irradiation time Td1 corresponding to the deflection angle range DR1. The illumination light is deflected in the range corresponding to the above to illuminate the fundus Ef. Further, the control unit 100 coincides with the irradiation range ILR41 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef, and makes the image sensor 51 open so that the opening range OR41 having a predetermined opening width opens for the opening time Td1. Control.

For example, when the deflection angle range is the above DR2, the control unit 100 deflects the illumination light in the range corresponding to the deflection angle range DR2 by the irradiation time Td2 corresponding to the deflection angle range DR2 by controlling the optical scanner 30. Then, the fundus Ef is illuminated. Further, the control unit 100 coincides with the irradiation range ILR 42 on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef, and makes the image sensor 51 open so that the opening range OR 42 having a predetermined opening width is opened by the opening time Td2. Control.

Similarly, for example, when the deflection angle range is the above DR3, the control unit 100 controls the optical scanner 30 to illuminate the irradiation time Td3 corresponding to the deflection angle range DR3 in the range corresponding to the deflection angle range DR3. The light is deflected to illuminate the fundus Ef. Further, the control unit 100 sets the image sensor 51 so that the opening range OR43 having a predetermined opening width coincides with the irradiation range ILR43 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef and opens for the opening time Td3. Control. For example, the closer to the center of the imaging region _RIMG , the shorter the irradiation time (opening time).

The control unit 100 reads out the light receiving result obtained by the light receiving elements of the aperture ranges OR41, OR42, OR43, OR44, ... By the global shutter method, and uses the read light receiving result to data the image of the fundus Ef. It is formed in the processing unit 200. The formation of the image in each frame may be performed in parallel with the light reception in the other frames.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the irradiation (scanning) of the photographing region _RIMG in the fundus Ef with the illumination light is completed, the control unit 100 synthesizes the images formed for each frame. As a result, the data processing unit 200 is formed with an image of the fundus Ef in which the entire imaging region _RIMG is depicted.

For example, the storage unit 102 stores the fourth control information in which the irradiation time of the illumination light (opening time of the opening range) is associated in advance corresponding to the deflection angle range (shooting target position). The control unit 100 controls the optical scanner 30 so as to irradiate the irradiation area with the illumination light for the irradiation time corresponding to the imaging target position with reference to the fourth control information, and the aperture corresponding to the imaging target position. It is possible to control the image sensor 51 so as to set an aperture range having a predetermined aperture width for a period of time.

As described above, the control unit 100 controls the optical scanner 30 so that the illumination light illuminates the irradiation region for the irradiation time corresponding to the position of the irradiation region of the illumination light in the fundus Ef for each frame period. The image sensor 51 is controlled so as to set an opening range that opens only for an opening time corresponding to the position of the irradiation region. In some embodiments, an aperture range having a different aperture width is set depending on the position of the irradiation area of the illumination light on the fundus Ef.

According to the second operation example of the third embodiment, the light reception of the image sensor 51 capable of reading the light reception result by the global shutter method while changing the irradiation time (aperture time) according to the irradiation area of the illumination light in the fundus Ef. The range of openings in the surface can be moved. As a result, the amount of illumination light can be adjusted according to the position to be photographed. As a result, the entire shooting area can be illuminated with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). Therefore, it becomes possible to acquire a higher image quality image of the fundus Ef.

<Fourth Embodiment>
In the above embodiment, the case where the light receiving result obtained by the image sensor 51 is read out by the global shutter method has been described, but the configuration according to the embodiment is not limited to this. In the fourth embodiment, the light receiving result obtained by the image sensor 51 is read out by the rolling shutter method.

In the fourth embodiment, the irradiation region of the illumination light in the fundus Ef or the aperture target area in the fundus Ef corresponding to the aperture range is changed for each frame period in which the light receiving result of the aperture range is captured by the image sensor 31, and two or more. The optical scanner 30 and the image sensor 51 are controlled so that the aperture target area covers the photographing area _RIMG over the frame period. The fourth embodiment differs from the third embodiment in that the light receiving result obtained by the image sensor 51 is read out by the rolling shutter method.

Hereinafter, the ophthalmic apparatus according to the fourth embodiment will be described focusing on the differences from the ophthalmic apparatus according to the third embodiment.

Each of the configuration of the optical system and the configuration of the control system of the ophthalmic apparatus according to the fourth embodiment is the configuration and control of the optical system of the ophthalmic apparatus according to the third embodiment (that is, the ophthalmic apparatus 1 according to the first embodiment). It is similar to the structure of the system.

(First operation example)
FIG. 8A shows an explanatory diagram of a first operation example of the ophthalmic apparatus according to the fourth embodiment. In FIG. 8A, similarly to FIG. 7A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the first operation example, the irradiation range on the light receiving surface is changed and the opening range is changed so as to overlap the changed irradiation range for each frame period in which the light receiving result of the opening range is captured by the image sensor 51. Irradiation. Specifically, the control unit 100 irradiates a fixed irradiation region with illumination light at predetermined ranges obtained by dividing + 22.5 ° to -22.5 ° in the fundus Ef, and 2 or more. The optical scanner 30 is controlled so that the irradiation area of the illumination light covers the photographing area _RIMG over the frame.

In the image sensor 51, the aperture range having a predetermined aperture width and opening for a predetermined opening time is sequentially moved according to the position of the irradiation region in the imaging region _RIMG that is changed for each frame. Specifically, the control unit 100 is an image sensor so that the opening range having the opening width Wd1 is opened for a predetermined opening time so as to overlap the irradiation range on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef. 51 is sequentially controlled.

For example, when the deflection angle range is the above DR1, the control unit 100 controls the optical scanner 30 so as to irradiate (scan) the imaging target area corresponding to the deflection angle range DR1 with the illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR 51 so as to overlap the irradiation range ILR 51 on the light receiving surface corresponding to the irradiation region of the illumination light. That is, the control unit 100 controls the optical scanner 30 so as to irradiate the imaging target area corresponding to the deflection angle range DR1 with the illumination light, and sets the aperture width Wd1 at the position of the light receiving surface corresponding to the deflection angle range DR1. The image sensor 51 is controlled so that the opening range OR 51 having an opening range OR 51 opens for a predetermined opening time.

For example, when the deflection angle range is the above DR2, the control unit 100 controls the optical scanner 30 so as to illuminate the imaging target area corresponding to the deflection angle range DR2 with the illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR 52 so as to overlap the irradiation range ILR 52 on the light receiving surface corresponding to the irradiation region of the illumination light.

Similarly, for example, when the deflection angle range is the above DR3, the control unit 100 controls the optical scanner 30 so as to illuminate the imaging target area corresponding to the deflection angle range DR3 with illumination light. Further, the control unit 100 controls the image sensor 51 so as to set the opening range OR53 so as to overlap the irradiation range ILR53 on the light receiving surface corresponding to the irradiation area of the illumination light.

The control unit 100 reads out the light-receiving result obtained by the light-receiving element having the aperture range OR51 in the deflection angle range DR1 by a rolling shutter method, and forms an image of the fundus Ef in the data processing unit 200 using the read light-receiving result. Let me.

Similarly, the control unit 100 reads out the light receiving result obtained by the light receiving element of the aperture range OR52 (OR53) in the deflection angle range DR2 (DR3) by the rolling shutter method, and uses the read light receiving result to fundus Ef. The image of is formed in the data processing unit 200.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the irradiation (scanning) of the photographing region _RIMG in the fundus Ef with the illumination light is completed, the control unit 100 synthesizes the images formed for each frame. As a result, the data processing unit 200 is formed with an image of the fundus Ef in which the entire imaging region _RIMG is depicted.

According to the first operation example of the fourth embodiment, the aperture range on the light receiving surface of the image sensor 51 capable of reading the light receiving result by the rolling shutter method is set for each frame period according to the irradiation area of the illumination light in the fundus Ef. Can be moved. At this time, in the fourth embodiment, the same effect as in the third embodiment can be obtained by using an image sensor capable of reading the light receiving result by the global shutter method.

(Second operation example)
FIG. 8B shows an explanatory diagram of a second operation example of the ophthalmic apparatus according to the fourth embodiment. In FIG. 8B, similarly to FIG. 8A, the vertical axis represents the deflection angle range (± 22.5 °) with respect to the scan center as the imaging region in the fundus Ef, and the horizontal axis represents the time axis.

In the second operation example, an opening range is set for each frame period in which the illumination light is irradiated for the irradiation time corresponding to the irradiation area of the illumination light in the fundus Ef and the aperture is opened for the opening time corresponding to the irradiation area of the illumination light. Will be done. In this case, the control unit 100 controls the optical scanner 30 so as to irradiate the irradiation area with the irradiation light at the irradiation time corresponding to the irradiation area of the illumination light in the fundus Ef for each frame period. Further, the control unit 100 overlaps the irradiation range on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef for each frame period, and the opening range having a predetermined opening width is only the opening time corresponding to the irradiation area. The image sensor 51 is sequentially controlled so as to open.

For example, when the deflection angle range is the above DR1, the control unit 100 controls the optical scanner 30 (or the light source 10 and the optical scanner 30) to control the deflection angle range DR1 by the irradiation time Td1 corresponding to the deflection angle range DR1. The illumination light is deflected in the range corresponding to the above to illuminate the fundus Ef. Further, the control unit 100 overlaps the irradiation range ILR61 on the light receiving surface corresponding to the irradiation region of the illumination light in the fundus Ef, and makes the image sensor 51 open so that the opening range OR61 having a predetermined opening width is opened by the opening time Td1. Control.

For example, when the deflection angle range is the above DR2, the control unit 100 deflects the illumination light in the range corresponding to the deflection angle range DR2 by the irradiation time Td2 corresponding to the deflection angle range DR2 by controlling the optical scanner 30. Then, the fundus Ef is illuminated. Further, the control unit 100 overlaps the irradiation range ILR62 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef, and makes the image sensor 51 open so that the opening range OR62 having a predetermined opening width is opened by the opening time Td2. Control.

Similarly, for example, when the deflection angle range is the above DR3, the control unit 100 controls the optical scanner 30 to illuminate the irradiation time Td3 corresponding to the deflection angle range DR3 in the range corresponding to the deflection angle range DR3. The light is deflected to illuminate the fundus Ef. Further, the control unit 100 overlaps the irradiation range ILR63 on the light receiving surface corresponding to the irradiation area of the illumination light in the fundus Ef, and makes the image sensor 51 open so that the opening range OR63 having a predetermined opening width opens for the opening time Td3. Control. For example, the closer to the center of the imaging region _RIMG , the shorter the irradiation time (opening time).

The control unit 100 reads out the light-receiving results obtained by the light-receiving elements of the aperture ranges OR61, OR62, OR63, ... By the rolling shutter method, and among the read light-receiving results, the irradiation ranges ILR61, ILR62, ILR63, ... The image of the fundus Ef is formed in the data processing unit 200 by using the light receiving result obtained by the light receiving element in the range overlapping with the above.

Hereinafter, similarly, the control of the optical scanner 30 and the image sensor 51 is repeated, and when the irradiation (scanning) of the photographing region _RIMG in the fundus Ef with the illumination light is completed, the control unit 100 synthesizes the images formed for each frame. As a result, the data processing unit 200 is formed with an image of the fundus Ef in which the entire imaging region _RIMG is depicted.

For example, the storage unit 102 stores fifth control information in which the irradiation time of the illumination light (opening time of the opening range) is associated in advance with the deflection angle range (shooting target position). The control unit 100 controls the optical scanner 30 so as to irradiate the irradiation area with the illumination light for the irradiation time corresponding to the imaging target position with reference to the fifth control information, and the aperture corresponding to the imaging target position. It is possible to control the image sensor 51 so as to set an aperture range having a predetermined aperture width for a period of time.

As described above, the control unit 100 controls the optical scanner 30 so that the illumination light illuminates the irradiation region for the irradiation time corresponding to the position of the irradiation region of the illumination light in the fundus Ef for each frame period. The image sensor 51 is controlled so that an opening range that opens for an opening time corresponding to the position of the irradiation region is set and the light receiving result of the opening range is read out by a rolling shutter method. In some embodiments, an aperture range having a different aperture width is set depending on the position of the irradiation area of the illumination light on the fundus Ef.

According to the second operation example of the fourth embodiment, the light reception of the image sensor 51 capable of reading the light reception result by the rolling shutter method while changing the irradiation time (aperture time) according to the irradiation area of the illumination light in the fundus Ef. The range of openings in the surface can be moved. As a result, the amount of illumination light can be adjusted according to the position to be photographed. As a result, the entire shooting area can be illuminated with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). Therefore, it becomes possible to acquire a higher image quality image of the fundus Ef.

[Action]
The operation of the ophthalmic apparatus, the control method thereof, and the program according to the embodiment will be described.

The ophthalmic apparatus (1) according to some embodiments includes an illumination optical system (20), an optical scanner (30), a photographing optical system (40), and a control unit (100, main control unit 101). .. The illumination optical system produces slit-shaped illumination light. The optical scanner deflects the illumination light and guides it to a predetermined portion (fundus Ef) of the eye to be inspected (E). The photographing optical system guides the return light of the illumination light from the predetermined portion to the image sensor (51) in which the aperture range on the light receiving surface can be set. The control unit uses light so that the irradiation range on the light receiving surface corresponding to the irradiation area of the illumination light overlaps the aperture range in the imaging region of the predetermined portion, and the light reception result of the return light in the aperture range overlapping the irradiation range is acquired. Controls the scanner and image sensor.

According to such an aspect, it is possible to arbitrarily change the irradiation area of the illumination light in the predetermined portion of the eye to be inspected and the opening range in the light receiving surface of the image sensor while synchronizing them. This makes it possible to acquire a clear image of a predetermined portion while suppressing the influence of unnecessary scattered light with a simple configuration.

In the ophthalmic apparatus according to some embodiments, the control unit moves the aperture range and controls the optical scanner and the image sensor so that the irradiation range overlaps the aperture range after the movement.

According to such an aspect, the irradiation area of the illumination light in the predetermined portion of the eye to be inspected can be changed according to the position of the opening range on the light receiving surface of the image sensor.

In the ophthalmic apparatus according to some embodiments, the control unit moves the irradiation range and controls the optical scanner and the image sensor so that the aperture range overlaps with the irradiation range after the movement.

According to such an aspect, the irradiation area of the illumination light in the predetermined portion of the eye to be inspected can be changed according to the position of the opening range on the light receiving surface of the image sensor.

In the ophthalmic apparatus according to some embodiments, the control unit controls the optical scanner to scan the irradiated area with illumination light.

According to such an aspect, it becomes possible to irradiate an irradiation area having a desired shape and size with illumination light.

In the ophthalmic apparatus according to some embodiments, in the control unit, during one frame period in which the light receiving result of the aperture range is captured by the image sensor, the aperture target area in the predetermined portion corresponding to the aperture range covers the imaging area. In addition, it controls the optical scanner and the image sensor.

According to such an aspect, it is possible to acquire a clear image of a predetermined portion while reducing the burden on the eye to be inspected and suppressing the influence of unnecessary scattered light with a simple configuration.

In the ophthalmic apparatus according to some embodiments, the control unit controls the optical scanner so as to deflect the illumination light at a deflection speed corresponding to the position of the irradiation region of the illumination light at a predetermined portion, and the position of the irradiation region is determined. The image sensor is controlled to set an aperture range with the corresponding aperture width.

According to such an aspect, it is possible to illuminate the entire shooting area with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). can. Therefore, it becomes possible to acquire a higher image quality image of a predetermined portion.

In the ophthalmic apparatus according to some embodiments, the control unit changes the irradiation area or the opening target area in the predetermined portion corresponding to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the aperture target area covers the photographing area over the above frame period.

According to such an aspect, it is possible to acquire a clear image of a predetermined portion while suppressing the influence of the fixative tremor of the eye to be inspected in addition to the influence of unnecessary scattered light with a simple configuration.

In the ophthalmic apparatus according to some embodiments, the control unit controls the optical scanner to deflect the illumination light at a deflection speed corresponding to the position of the irradiation region of the illumination light at a predetermined portion for each frame period, and also controls the optical scanner. The image sensor is controlled so as to set an aperture range having an aperture width corresponding to the position of the irradiation region.

According to such an aspect, it is possible to illuminate the entire shooting area with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). can. Therefore, it becomes possible to acquire a higher image quality image of a predetermined portion.

In the ophthalmic apparatus according to some embodiments, the control unit coincides with the opening target area in the predetermined portion corresponding to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the aperture target area covers the photographing area over the above frame period.

According to such an aspect, it is possible to acquire a clear image of a predetermined part while suppressing the influence of the fixation tremor of the eye to be inspected in addition to the influence of unnecessary scattered light by a simple configuration and processing. Become.

In the ophthalmic apparatus according to some embodiments, the control unit controls the optical scanner so that the illumination light illuminates the irradiation area for the irradiation time corresponding to the position of the irradiation area of the illumination light in the predetermined portion for each frame period. At the same time, the image sensor is controlled so as to set an opening range that opens for an opening time corresponding to the position of the irradiation region.

According to such an aspect, it is possible to illuminate the entire shooting area with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). can. Therefore, it becomes possible to acquire a higher image quality image of a predetermined portion.

In the ophthalmic apparatus according to some embodiments, the control unit acquires the light receiving result obtained by the image sensor by the global shutter method.

According to such an aspect, it is possible to acquire a clear image of a predetermined part while suppressing the influence of unnecessary scattered light with a simple configuration using an image sensor that can read out the light reception result by the global shutter method. become.

In the ophthalmic apparatus according to some embodiments, the control unit acquires the light receiving result obtained by the image sensor by the rolling shutter method, and the irradiation area is taken for each frame period in which the light receiving result in the aperture range is captured by the image sensor. Overlaps the aperture target area in the predetermined portion corresponding to the aperture range, and controls the optical scanner and the image sensor so that the aperture target area covers the imaging area over two or more frame periods.

According to such an aspect, with a simple configuration and simple processing using an image sensor capable of acquiring a light receiving result by a rolling shutter method, in addition to the influence of unnecessary scattered light, the influence of fixation tremor of the eye to be inspected and the like. It is possible to acquire a clear image of a predetermined part while suppressing the problem.

In the ophthalmic apparatus according to some embodiments, the control unit controls the optical scanner so that the illumination light illuminates the irradiation area for the irradiation time corresponding to the position of the irradiation area of the illumination light in the predetermined portion for each frame period. At the same time, the image sensor is controlled so as to read out the light receiving result in the opening range corresponding to the position of the irradiation area by the rolling shutter method.

According to such an aspect, with a simple configuration using an image sensor that can read out the light receiving result by the rolling shutter method, the illumination light is emitted at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). The entire shooting area can be illuminated with a uniform amount of light without reducing the amount of light. Therefore, it becomes possible to acquire a higher image quality image of a predetermined portion.

The ophthalmic apparatus according to some embodiments includes an image forming unit (data processing unit 200) that forms an image of a predetermined portion based on a light receiving result captured in an aperture range overlapping the irradiation range.

According to such an aspect, it is possible to acquire a clear image of a predetermined portion while suppressing the influence of unnecessary scattered light with a simple configuration.

In the ophthalmic apparatus according to some embodiments, the illumination optical system includes a slit (22) in which the opening can be arranged at a position optically coupled to a predetermined portion, and the light from the light source (10) is the opening. The illumination light is generated by passing through the light source, the optical scanner can be placed at a position optically coupled to the iris of the eye to be inspected, and the light receiving surface can be placed at a position optically coupled to a predetermined portion. Is.

According to such an embodiment, by irradiating a predetermined portion of the eye to be inspected with slit-shaped illumination light, a clear image of the predetermined portion can be obtained with a simple configuration while suppressing the influence of unnecessary scattered light. Will be possible.

In the ophthalmic apparatus according to some embodiments, the illumination optics are arranged between the light source and the slit, and an opening is formed at a position eccentric with respect to the optical axis of the illumination optics, which is optically abbreviated as an iris. It includes an iris diaphragm (21) that can be placed in a conjugate position, an opening that can be placed in a position that is optically conjugate with the iris is formed, and the optical path of the illumination light deflected by the optical scanner and the optical path of the photographing optical system. Includes a hole mirror (45) to connect with.

According to such an aspect, since the pupil can be divided and the predetermined portion of the eye to be inspected can be irradiated with the illumination light, it becomes possible to acquire a higher image quality image of the eye to be inspected.

In the ophthalmic apparatus according to some embodiments, the predetermined site is the fundus (Ef).

According to such an aspect, it is possible to acquire a clear image of the fundus with a simple configuration while suppressing the influence of unnecessary scattered light.

Some embodiments include an illumination optical system (20) that generates slit-shaped illumination light, an optical scanner (30) that deflects the illumination light and guides the illumination light to a predetermined portion (fundus Ef) of the eye to be inspected (E). It is a control method of an ophthalmic apparatus (1) including an imaging optical system (40) that guides a return light of illumination light from a predetermined portion to an image sensor (51) capable of setting an opening range on a light receiving surface. The control method of the ophthalmologic device is such that the irradiation range on the light receiving surface corresponding to the irradiation area of the illumination light overlaps the aperture range in the imaging area of the predetermined portion, and the light receiving result of the return light in the aperture range overlapping the irradiation range is acquired. Includes control steps to control the optical scanner and image sensor.

According to such an aspect, it is possible to arbitrarily change the irradiation area of the illumination light in the predetermined portion of the eye to be inspected and the opening range in the light receiving surface of the image sensor while synchronizing them. This makes it possible to acquire a clear image of a predetermined portion while suppressing the influence of unnecessary scattered light with a simple configuration and control.

In the control method of the ophthalmologic apparatus according to some embodiments, the control step is an image sensor control step for controlling the image sensor so as to move the aperture range, and light so that the irradiation range overlaps with the aperture range after the movement. Includes an optical scanner control step to control the scanner.

According to such an aspect, the irradiation area of the illumination light in the predetermined portion of the eye to be inspected can be changed according to the position of the opening range on the light receiving surface of the image sensor.

In the control method of the ophthalmologic apparatus according to some embodiments, the control step is an optical scanner control step for moving the irradiation range and an image sensor control for controlling the image sensor so that the aperture range overlaps with the irradiation range after movement. Including steps.

According to such an aspect, the irradiation area of the illumination light in the predetermined portion of the eye to be inspected can be changed according to the position of the opening range on the light receiving surface of the image sensor.

In the method of controlling an ophthalmic appliance according to some embodiments, the control step controls the optical scanner to scan the illuminated area with illumination light.

According to such an aspect, it becomes possible to irradiate an irradiation area having a desired shape and size with illumination light.

In the control method of the ophthalmic apparatus according to some embodiments, in the control step, during one frame period in which the light receiving result of the aperture range is captured by the image sensor, the aperture target area in the predetermined portion corresponding to the aperture range covers the imaging area. Control the optical scanner and image sensor to cover.

According to such an aspect, it is possible to acquire a clear image of a predetermined portion while reducing the burden on the eye to be inspected and suppressing the influence of unnecessary scattered light with a simple configuration and control.

In the control method of the ophthalmic appliance according to some embodiments, the control step changes the irradiation area or the opening target area in the predetermined portion corresponding to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the aperture target area covers the photographing area over two or more frame periods.

According to such an aspect, it is possible to illuminate the entire shooting area with a uniform amount of light without reducing the amount of illumination light at a position away from the center position of the shooting area (for example, a position where the deflection angle is large). can. Therefore, it becomes possible to acquire a higher image quality image of a predetermined portion.

In the control method of the ophthalmic appliance according to some embodiments, the control step coincides with the opening target area in the predetermined portion where the irradiation area corresponds to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the aperture target area covers the photographing area over two or more frame periods.

According to such an aspect, it is possible to acquire a clear image of a predetermined part while suppressing the influence of the fixation tremor of the eye to be inspected in addition to the influence of unnecessary scattered light with a simple configuration and control. Become.

In the control method of the ophthalmic apparatus according to some embodiments, the image sensor can acquire the light receiving result by the global shutter method.

According to such an aspect, it is possible to acquire a clear image of a predetermined part while suppressing the influence of unnecessary scattered light by a simple configuration and control using an image sensor that can read out the light reception result by the global shutter method. Will be possible.

In the control method of the ophthalmologic apparatus according to some embodiments, the image sensor can acquire the light receiving result by the rolling shutter method, and the control step illuminates each frame period in which the light receiving result of the aperture range is captured by the image sensor. The optical scanner and the image sensor are controlled so that the area includes the area to be opened at a predetermined portion corresponding to the area to be opened and the area to be opened covers the imaging area over two or more frame periods.

According to such an aspect, with a simple configuration and simple processing using an image sensor capable of acquiring a light receiving result by a rolling shutter method, in addition to the influence of unnecessary scattered light, the influence of fixation tremor of the eye to be inspected and the like. It is possible to acquire a clear image of a predetermined part while suppressing the problem.

The method of controlling an ophthalmic appliance according to some embodiments includes an image forming step of forming an image of a predetermined site based on the light receiving result captured in the aperture range.

According to such an aspect, it is possible to acquire a clear image of a predetermined portion while suppressing the influence of unnecessary scattered light with a simple configuration and control.

In the control method of the ophthalmologic device according to some embodiments, the predetermined site is the fundus.

According to such an aspect, it is possible to acquire a clear image of the fundus with a simple configuration and control while suppressing the influence of unnecessary scattered light.

The program according to some embodiments causes a computer to perform each step of the method of controlling an ophthalmic appliance according to any of the above.

According to such a program, it is possible to acquire a clear image of a predetermined portion while suppressing the influence of unnecessary scattered light with a simple configuration and control.

The embodiments shown above are merely examples for carrying out the present invention. A person who intends to carry out the present invention can make arbitrary modifications, omissions, additions, etc. within the scope of the gist of the present invention.

It is possible to arbitrarily combine the contents of two or more embodiments out of the above-mentioned plurality of embodiments.

In the above embodiment, the ophthalmic apparatus has any functions that can be used in the field of ophthalmology, such as an axial length measuring function, an intraocular pressure measuring function, an optical coherence tomography (OCT) function, and an ultrasonic examination function. May be. The axial length measurement function is realized by an optical coherence tomography or the like. In addition, the axial length measurement function projects light onto the eye to be inspected and detects the return light from the fundus while adjusting the position of the optical system in the Z direction (anterior-posterior direction) with respect to the eye to be inspected. The axial length of the eye may be measured. The intraocular pressure measuring function is realized by a tonometer or the like. The OCT function is realized by an optical coherence tomometer or the like. The ultrasonic inspection function is realized by an ultrasonic diagnostic apparatus or the like. It is also possible to apply the present invention to a device (multifunction device) having two or more of such functions.

In some embodiments, a program is provided for causing a computer to execute the control method of the ophthalmologic device described above. Such a program can be stored on any computer-readable non-transitory recording medium. The recording medium may be an electronic medium using magnetism, light, magneto-optical, semiconductor, or the like. Typically, the recording medium is a magnetic tape, a magnetic disk, an optical disk, a magneto-optical disk, a flash memory, a solid state drive, or the like. It is also possible to send and receive this program through a network such as the Internet or LAN.

1 Ophthalmology device 10 Light source 20 Illumination optical system 21 Iridescent aperture 22 Slit 23, 41, 44, 48 Relay lens 30 Optical scanner 35 Projection optical system 40 Imaging optical system 42 Black dot plate 43 Reflection mirror 45 Hole mirror 46 Objective lens 47 Focusing lens 49 Imaging lens 50 Imaging device 51 Image sensor 100 Control unit 101 Main control unit 102 Storage unit 200 Data processing unit E Eye to be inspected Ef Bottom of eye

Claims (29)

Illumination optics that generate slit-shaped illumination light,
An optical scanner that deflects the illumination light and guides it to a predetermined part of the eye to be inspected.
An imaging optical system that guides the return light of the illumination light from the predetermined portion to an image sensor capable of setting an aperture range on the light receiving surface, and
In the photographing region of the predetermined portion, the irradiation range on the light receiving surface corresponding to the irradiation region of the illumination light overlaps with the aperture range, and the light receiving result of the return light in the aperture range overlapping with the irradiation range is acquired. In addition, a control unit that controls the optical scanner and the image sensor,
Including ophthalmic equipment. The ophthalmologic apparatus according to claim 1, wherein the control unit moves the aperture range and controls the optical scanner and the image sensor so that the irradiation range overlaps the aperture range after the movement. .. The ophthalmology according to claim 1, wherein the control unit moves the irradiation range and controls the optical scanner and the image sensor so that the aperture range overlaps the irradiation range after the movement. Device. The ophthalmic apparatus according to any one of claims 1 to 3, wherein the control unit controls the optical scanner so as to scan the irradiation area with the illumination light. The control unit is the optical scanner so that the aperture target area in the predetermined portion corresponding to the aperture range covers the imaging region during one frame period in which the light receiving result of the aperture range is captured by the image sensor. The ophthalmic apparatus according to claim 4, wherein the image sensor is controlled. The control unit controls the optical scanner so as to deflect the illumination light at a deflection speed corresponding to the position of the irradiation region of the illumination light in the predetermined portion, and has an aperture width corresponding to the position of the irradiation region. The ophthalmic apparatus according to claim 5, wherein the image sensor is controlled so as to set the opening range. The control unit changes the irradiation area or the opening target area in the predetermined portion corresponding to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor, and over two or more frame periods. The ophthalmologic apparatus according to claim 4, wherein the optical scanner and the image sensor are controlled so that the aperture target area covers the imaging area. The control unit controls the optical scanner so as to deflect the illumination light at a deflection speed corresponding to the position of the irradiation region of the illumination light in the predetermined portion for each frame period, and at the position of the irradiation region. The ophthalmic apparatus according to claim 7, wherein the image sensor is controlled so as to set the opening range having a corresponding opening width. In each frame period in which the light receiving result of the opening range is captured by the image sensor, the control unit matches the irradiation area with the opening target area in the predetermined portion corresponding to the opening range, and over two or more frame periods. The ophthalmologic apparatus according to claim 4, wherein the optical scanner and the image sensor are controlled so that the aperture target area covers the imaging area. The control unit controls the optical scanner so that the illumination light irradiates the irradiation region for an irradiation time corresponding to the position of the irradiation region of the illumination light in the predetermined portion for each frame period, and also performs the irradiation. The ophthalmic apparatus according to claim 9, wherein the image sensor is controlled so as to set the opening range that opens only for the opening time corresponding to the position of the region. The ophthalmic apparatus according to any one of claims 1 to 10, wherein the control unit acquires a light receiving result obtained by the image sensor by a global shutter method. The control unit acquires the light receiving result obtained by the image sensor by the rolling shutter method, and the irradiation area corresponds to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor. The fourth aspect of the present invention is characterized in that the optical scanner and the image sensor are controlled so that the aperture target area overlaps the opening target area in the predetermined portion and covers the imaging area over two or more frame periods. The ophthalmic device described. The control unit controls the optical scanner so that the illumination light irradiates the irradiation region for an irradiation time corresponding to the position of the irradiation region of the illumination light in the predetermined portion for each frame period, and also performs the irradiation. The ophthalmic apparatus according to claim 12, wherein the image sensor is controlled so as to read out the light receiving result of the opening range corresponding to the position of the region by a rolling shutter method. 6. Ophthalmology equipment. The illumination optical system includes a slit in which the opening can be arranged at a position optically conjugate with the predetermined portion, and the light from the light source passes through the opening to generate the illumination light.
The optical scanner can be placed at a position optically conjugate with the iris of the eye to be inspected.
The ophthalmic apparatus according to any one of claims 1 to 14, wherein the light receiving surface can be arranged at a position optically conjugate to the predetermined portion. The illumination optical system is arranged between the light source and the slit, and an opening is formed at a position eccentric with respect to the optical axis of the illumination optical system so that the illumination optical system can be arranged at a position optically conjugate with the iris. Including optics aperture
An opening that can be arranged at a position substantially conjugate with the iris is formed, and is characterized by including a hole mirror that connects the optical path of the illumination light deflected by the optical scanner and the optical path of the photographing optical system. The ophthalmic apparatus according to claim 15. The ophthalmologic apparatus according to any one of claims 1 to 16, wherein the predetermined site is a fundus. Illumination optics that generate slit-shaped illumination light,
An optical scanner that deflects the illumination light and guides it to a predetermined part of the eye to be inspected.
It is a control method of an ophthalmic apparatus including an imaging optical system that guides a return light of the illumination light from the predetermined portion to an image sensor capable of setting an aperture range on the light receiving surface.
In the photographing region of the predetermined portion, the irradiation range on the light receiving surface corresponding to the irradiation region of the illumination light overlaps with the aperture range, and the light receiving result of the return light in the aperture range overlapping with the irradiation range is acquired. A method for controlling an ophthalmic apparatus, comprising a control step for controlling the optical scanner and the image sensor. The control step is
An image sensor control step that controls the image sensor so as to move within the aperture range,
An optical scanner control step that controls the optical scanner so that the irradiation range overlaps the aperture range after movement.
18. The method for controlling an ophthalmic appliance according to claim 18. The control step is
An optical scanner control step that moves the irradiation range, and
An image sensor control step that controls the image sensor so that the opening range overlaps the irradiation range after movement, and
18. The method for controlling an ophthalmic appliance according to claim 18. The control method for an ophthalmic apparatus according to any one of claims 18 to 20, wherein the control step controls the optical scanner so as to scan the irradiation area with the illumination light. The control step is the optical scanner so that the aperture target area in the predetermined portion corresponding to the aperture range covers the imaging region during one frame period in which the light receiving result of the aperture range is captured by the image sensor. The method for controlling an ophthalmic apparatus according to claim 21, wherein the image sensor is controlled. In the control step, the irradiation area or the opening target area in the predetermined portion corresponding to the opening range is changed for each frame period in which the light receiving result of the opening range is captured by the image sensor, and the opening target area is changed over two or more frame periods. The control method for an ophthalmic apparatus according to claim 21, wherein the optical scanner and the image sensor are controlled so that the aperture target area covers the imaging area. In the control step, the irradiation area coincides with the opening target area in the predetermined portion corresponding to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor, and the control step coincides with the opening target area in the predetermined portion corresponding to the opening range. The control method for an ophthalmic apparatus according to claim 21, wherein the optical scanner and the image sensor are controlled so that the aperture target area covers the imaging area. The control method for an ophthalmic apparatus according to any one of claims 18 to 24, wherein the image sensor can acquire a light receiving result by a global shutter method. The image sensor can acquire the light receiving result by the rolling shutter method.
The control step includes the opening target area in the predetermined portion where the irradiation area corresponds to the opening range for each frame period in which the light receiving result of the opening range is captured by the image sensor, and the opening is performed over two or more frame periods. The control method for an ophthalmic apparatus according to claim 18, wherein the optical scanner and the image sensor are controlled so that the target area covers the imaging area. The control method for an ophthalmic apparatus according to any one of claims 18 to 26, comprising an image forming step of forming an image of the predetermined portion based on a light receiving result captured in the opening range. .. The control method for an ophthalmic apparatus according to any one of claims 18 to 27, wherein the predetermined portion is a fundus. A program comprising causing a computer to execute each step of the method for controlling an ophthalmic apparatus according to any one of claims 18 to 28.

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