JP2007275159A - Ophthalmologic imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the most of an image pickup effective range of an image pickup device by selectively using a plurality of image pickup units where the image pickup devices of different sizes are embedded. <P>SOLUTION: In step S1, information on the attachment and detachment of the image pickup unit from an attachment and detachment detecting means is monitored. In step S2, information on the size of the image pickup device is read. Steps S3, S5, S7 detect which image pickup device 30a, 30b, 30c is embedded in the attached image pickup unit. In steps S4, S6, S8, a corresponding variable power lens 13a, 13b, or 13c is inserted in an imaging optical system. In steps S9, S10, S11, the imaging light quantity is altered to correspond to the selected variable power lens 13a, 13b, or 13c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ophthalmologic photographing apparatus for photographing an eye to be examined in an ophthalmic clinic or the like.

  2. Description of the Related Art Conventionally, a fundus photographing apparatus that captures an eye image using an image sensor typified by a CCD and converts the image into a video signal to observe and photograph the eye to be examined is known. An imaging unit having an imaging element is detachable from the fundus camera main body, and a fixed photographing magnification corresponding to the effective imaging range of the image sensor is set in the fundus camera main body.

  In Patent Document 1, an image pickup unit having an image pickup device is detachable from the fundus camera main body, and the image pickup unit has a zooming unit, and photographs according to the magnification of the zooming unit. A fundus photographing apparatus that displays a range has been proposed.

JP-A-7-284477

  However, in the ophthalmologic photographing apparatus as shown in the above-described conventional example, it is not assumed that fundus photographing is performed using a plurality of imaging units having imaging elements of different sizes.

  For example, in such an ophthalmologic photographing apparatus, the fundus camera main body performs fundus photographing by attaching and detaching an imaging unit incorporating an imaging element. In this case, as shown in FIG. 6, the image pickup device A having the image pickup surface of Ax · Ay, the image pickup device B having a size of Bx · By smaller than the image pickup device A, and larger than the image pickup device A It is assumed that an image sensor C having a size of Cx · Xy can be selected.

  FIG. 7A shows a fundus image captured using the image sensor A. In this image capturing unit, the imaging magnification is determined so that the fundus image is optimally formed in the effective image formation range of the image sensor A. Yes.

  In addition, as shown in FIG. 7B, in the case of performing fundus photographing with an imaging unit including an image sensor B smaller than the image sensor A, information on the peripheral portion of the photographed fundus image is missing. The image is formed in a state. Further, when the fundus photographing is performed with the image pickup unit including the image pickup device C mounted, the image pickup device C is larger than the image pickup device A, so that the peripheral portion of the image pickup device C is completely black as shown in FIG. This range is a fundus image that is hardly used.

  As described above, when fundus imaging is performed using an imaging unit having an imaging element with a different size in the fundus camera main body, only a part of the imaging element is used or only a fundus image with a narrow imaging angle of view can be obtained. There is a problem.

  Further, in the ophthalmologic photographing apparatus having the magnification changing means described in Patent Document 1, the magnification is changed with respect to an image sensor having a single size. When a fundus photographing is performed by mounting an imaging unit including an imaging element A having a size of Ax / Ay, for example, on the main body of such an ophthalmologic photographing apparatus, as shown in FIG. The imaging magnification is determined so that the fundus image is optimally formed on the image sensor. However, if the magnification is reduced through the magnification changing means, a fundus image as shown in FIG. 8B is obtained, and if the magnification is increased, a fundus image as shown in FIG. 8C is obtained.

  In either case, there is a similar problem that only a part of the image sensor is used or only a fundus image with a narrow shooting angle of view can be obtained.

  The object of the present invention is to solve the above-mentioned problems and to take a picture using the imaging effective range of the imaging element to the maximum, even if a plurality of imaging units having imaging elements of different sizes are selectively used. Is to provide a special ophthalmologic photographing apparatus.

  Technical features of the ophthalmologic photographing apparatus according to the present invention for achieving the above-described object include an illumination optical system having an illumination light source for illuminating the eye to be examined, a photographing optical system for photographing the eye to be examined at different photographing magnifications, and the photographing A main body unit having a magnification changing unit for changing the magnification, an imaging element that forms an eye image formed by the imaging optical system and generates an electronic image, and size information of the imaging element An image pickup unit having an image pickup element information notifying unit for notifying the image pickup unit, and the main body is detachable from the plurality of image pickup units having different sizes of the image pickup element and is provided in the image pickup unit. It has input means for inputting information from the image sensor information notifying means, and the magnification changing means is to change the photographing magnification according to the size of the image sensor based on information from the input means. .

  According to the ophthalmologic photographing apparatus according to the present invention, by changing the photographing magnification by changing the magnification lens in the main body according to the size of the imaging element, the imaging effective range of the imaging element is effectively used to the maximum extent, It is possible to obtain an eye image with high resolution.

  Further, if the light amount of the illumination light source that illuminates the eye to be examined is changed according to the photographing magnification, the eye image to be examined can be photographed with the optimum light amount.

  Furthermore, if the type of the mounted imaging unit is detected and a power supply corresponding to the imaging unit is supplied, malfunction and destruction can be prevented without supplying an incorrect voltage and current to the imaging unit. .

  The present invention will be described in detail based on the embodiment shown in FIGS.

  FIG. 1 shows a configuration diagram of a fundus camera in the present embodiment. On the optical path from the observation light source 1 to the objective lens 9 in the fundus camera main body 100, a condenser lens 2, a photographing light source 3, a relay lens 4, a mirror 5, a diaphragm 6 having a ring-shaped opening, and a relay lens 7. The perforated mirrors 8 are sequentially arranged. These constitute the fundus illumination optical system O1.

  On the optical path behind the perforated mirror 8, a focusing lens 10, a photographing lens 11, a movable mirror 12, and a variable power lens unit 13 are sequentially arranged to constitute a fundus photographing optical system O2. The variable power lens unit 13 includes three variable power lenses 13a to 13c, and any one of the variable power lenses 13a to 13c is alternatively arranged on the fundus photographing optical system O2. Yes. In FIG. 1, a zoom lens 13a is inserted on the optical path, and the other two zoom lenses 13b and 13c are retracted out of the optical path.

  A mirror 14 is disposed on the optical path in the reflection direction of the movable mirror 12, and a finder 15 including a field lens 15a and an eyepiece lens 15b is attached in the reflection direction of the mirror 14 to constitute a finder optical system O3. .

  Further, the fundus camera 100 is provided with a calculation unit 21, and the output of the calculation unit 21 is connected to the photographing light source 3 through the photographing light amount changing unit 22, and the variable power lens unit through the magnification changing unit 23. 13 is connected. Further, an attachment / detachment detection unit 24 for detecting attachment / detachment of the imaging unit 200 a is attached to the rear surface of the fundus camera main body 100, and an output of the attachment / detachment detection unit 24 is connected to the calculation unit 21. In the fundus camera main body 100, an output of an input unit 25 that receives information of an imaging unit described later is connected to the calculation unit 21.

  An imaging unit 200a is detachably attached to the rear surface of the fundus camera main body 100. In this imaging unit 200a, an imaging device 30a corresponding to the imaging device A shown in FIG. 6 and an imaging device information communication device 31a are built in, and the imaging device 30a is arranged on the optical path of the imaging optical system O2. The output of the image sensor notification device 31 a is connected to the input means 25 in the fundus camera main body 100.

  Further, in place of the imaging unit 200a, imaging units 200b and 200c each incorporating imaging elements 30b and 30c corresponding to the imaging elements B and C shown in FIG. 6 can be mounted. In these imaging units 200b and 200c, similarly to the imaging unit 200a, imaging element information notification units 31b and 31c are provided, respectively, and their outputs are connected to the input unit 25.

  During fundus observation, the light beam emitted from the observation light source 1 passes through the condenser lens 2, the photographing light source 3, and the relay lens 4, and is reflected by the mirror 5. The reflected light reflected by the mirror 5 passes through the diaphragm 6 and the relay lens 7, is reflected by the peripheral portion of the perforated mirror 8, and illuminates the fundus Er through the objective lens 9 and the pupil Ep of the eye E to be examined. The obtained fundus image passes through the pupil Ep of the eye E, the objective lens 9 and the hole of the perforated mirror 8, passes through the focusing lens 10 and the photographing lens 11, and is reflected by the movable mirror 12 and the mirror 14. . The reflected light reflected by the mirror 14 passes through the field lens 15a of the finder 15 and is observed by the operator through the eyepiece 15b.

  At the time of fundus photography, the operator performs alignment while observing the fundus image of the finder 15 and presses a photographing switch (not shown) when the alignment is correct, so that the movable mirror 12 is retracted from the photographing optical system O2 and the photographing light source 3 is moved. Emits light. The illumination light emitted from the imaging light source 3 irradiates the fundus Er of the eye E through the same optical path as that of the observation light source 1. Then, the fundus image passes through the pupil Ep of the eye E, the objective lens 9 and the hole of the perforated mirror 8, passes through the focusing lens 10 and the photographing lens 11, and passes through the zoom lens 13a to obtain the fundus image from the imaging unit 200a. The image is formed on the image sensor 30a. Photoelectric conversion is performed in the image pickup device 30a, and digital fundus image data is generated by a processing circuit (not shown) in the image pickup unit 200a.

  FIG. 2A shows a fundus image formed on the image sensor 30a in a state where the imaging unit 200a is mounted on the fundus camera main body 100. FIG.

In this embodiment, three types of image pickup units 200a to 200c are exchanged and used, and the sizes Ax, Bx, Cx, Ay, By, and the like of the image pickup devices 30a to 30c built in the image pickup units 200a to 200c are used. Cy has the following relationship.
Cx>Ax> Bx
Cy>Ay> By

  FIG. 3 is a flowchart of the operation performed by the calculation unit 21 when the operator replaces the imaging unit. In step S1, the calculation unit 21 monitors the attachment / detachment information of the image pickup unit 200 from the attachment / detachment detection unit 24. When the attachment of the image pickup unit 200 is detected, the process proceeds to step S2. In step S2, the size information of the image sensor 30 input from the image sensor information detection unit 31 to the input unit 25 is read, and the process proceeds to step S3.

  If it is determined in step S3 that the mounted imaging unit is the imaging unit 200a and the imaging element 30a is built in, the process proceeds to step S4. In step S4, the magnification changing unit 23 instructs to insert the variable magnification lens 13a into the photographing optical system O2. By inserting the variable magnification lens 13a into the optical path, the fundus image is formed so as to effectively use the image sensor 30a as shown in FIG.

  When the processing in step S4 is completed, the processing unit 21 proceeds to step S9, and the arithmetic unit 21 performs photographing so that the photographing light amount is changed according to the variable magnification lens 13a selected by the sensitivity, size, and magnification changing unit 23 of the image sensor 30a. It instructs the light quantity changing means 22.

  If it is determined in step S3 that the mounted image pickup unit is not the image pickup unit 200a including the image pickup device 30a, the process proceeds to step S5. If it is determined in step S5 that the attached image pickup unit is the image pickup unit 200b including the image pickup device 30b, the process proceeds to step S6.

  In step S6, the magnification changing unit 23 instructs to insert the variable magnification lens 13b into the photographing optical system O2. By inserting the zoom lens 13b into the optical path, the fundus image is formed on the image sensor 30b as shown in FIG. At this time, since the imaging element 30b is smaller than the imaging element 30a, the variable magnification lens 13b having a smaller imaging magnification than the variable magnification lens 13a is inserted into the photographing optical system O2.

  When the process of step S6 ends, the process proceeds to step S10, and the calculation unit 21 changes the photographing light amount so as to change the photographing light amount according to the magnification lens 13b selected by the sensitivity, size, and magnification changing unit 23 of the image sensor 30b. The change unit 22 is instructed.

  If it is determined in step S5 that the mounted image pickup unit is not the image pickup unit 200b including the image pickup device 30b, the process proceeds to step S7. If it is determined in step S7 that the mounted image pickup unit 200 is the image pickup unit 200c including the image pickup device 30c, the process proceeds to step S8. In step S8, the magnification changing unit 23 instructs to insert the variable magnification lens 13c into the photographing optical system O2.

  The size of the image sensor 30c shown in FIG. 2C is Cx · Cy, and shows a state in which a fundus image is formed on the image sensor 30c. At this time, since the image sensor 30c is larger than the image sensor 30a, the variable power lens 13c having a larger image forming magnification than the variable power lens 13a is inserted into the photographing optical system O2.

  When the process of step S8 ends, the process proceeds to step S11, where the calculation unit 21 changes the photographing light amount so as to change the photographing light amount according to the variable magnification lens 13c selected by the sensitivity, size, and magnification changing unit 23 of the image sensor 30c. The change unit 22 is instructed.

  If it is determined in step S7 that the mounted image pickup unit is not the image pickup unit 200c incorporating the image pickup device 30c, the process returns to step S1 because the image pickup unit has been removed from the fundus camera main body 100.

  FIG. 4 is a configuration diagram of the fundus camera in the second embodiment. Compared with the first embodiment, a power supply unit 26 is added to the fundus camera main body 100 and connected to the calculation unit 21. Further, power sources 32 a to 32 c are provided in the imaging units 200 a to 200 c, respectively, and the power sources 32 a to 32 c are connected to the power supply unit 26. Furthermore, in the imaging units 200a to 200c, power information notification means 33a to 33c are provided, respectively, and connected to the input means 25 in the fundus camera main body 100.

  FIG. 5 is an operation flowchart of the calculation unit 21 when the operator replaces the imaging unit. In this flowchart, steps S2, S3, S5, and S7 are changed to steps S2 ', S3', S5 ', and S7', respectively, and steps S12 to S14 are added to the flowchart of FIG.

  In step S <b> 2 ′, the calculation unit 21 determines the type of the imaging unit from the information input from the imaging element information detection unit 31 and the power supply information notification unit 33 to the input unit 25.

  If it is determined in step S3 'that the mounted imaging unit is the imaging unit 200a, the process proceeds to steps S4, S9, and S12 sequentially. In step S12, the power supply means 26 supplies the voltage and current for the imaging unit 200a to the power source 32a in the imaging unit 200a.

  If it is determined in step S5 'that the mounted imaging unit is the imaging unit 200b, the process proceeds to steps S6, S10, and S13. In step S13, the power supply means 26 supplies the voltage and current for the imaging unit 200b to the imaging unit 200b.

  If it is determined in step S7 'that the mounted imaging unit is the imaging unit 200c, the process proceeds to steps S8, S11, and S14. In step S14, the power supply means 26 supplies the voltage and current for the imaging unit 200c to the imaging unit 200c.

  In the above-described embodiment, the case where three types of imaging units 200a to 200c are selected and used for the fundus camera main body 100 has been described, but the present invention is also applicable to the case of two types of imaging units or four or more types of imaging units. You can also

1 is a configuration diagram of Example 1. FIG. It is explanatory drawing of the fundus image formed in an image sensor. FIG. 3 is an operation flowchart of the first embodiment. FIG. 6 is a configuration diagram of Example 2. FIG. 6 is an operation flowchart of the second embodiment. It is explanatory drawing of the magnitude | size of an image pick-up element. It is explanatory drawing in the case of forming a fundus image on an image sensor of a different size. It is explanatory drawing at the time of forming the fundus image scaled to the image sensor of a single size.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Observation light source 3 Imaging light source 7 Relay lens 8 Perforated mirror 9 Objective lens 10 Focusing lens 12 Movable mirror 13a, 13b, 13c Variable magnification lens 15 Finder 21 Calculation part 22 Shooting light quantity change means 23 Magnification change means 24 Detachment detection Means 25 Input means 26 Power supply means 30a-30c Image sensor 31a-31c Image sensor information notification means 32a-32c Power source 33a-33c Power supply information notification means 100 Fundus camera main body 200a-200c Imaging unit

Claims (4)

  An imaging optical system having an illumination light source for illuminating the eye to be examined; a photographing optical system for photographing the eye to be examined at different photographing magnifications; and a main body unit having a magnification changing means for changing the photographing magnification. An imaging unit having an imaging device that forms an electronic image by forming an eye image captured by the system, and an imaging device information notification unit that notifies the main body of size information of the imaging device, and The main body unit includes an input unit that allows the plurality of imaging units having different sizes of the imaging elements to be detachable and inputs information from an imaging element information notification unit included in the imaging unit, and the magnification change The means changes the photographing magnification according to the size of the image pickup device based on information from the input means.   The main body includes a light amount changing unit that changes a light amount of the illumination light source, and the light amount changing unit changes a light amount of the illumination light source according to a photographing magnification set by the magnification changing unit. The ophthalmologic photographing apparatus according to claim 1.   The imaging unit has power information notification means for notifying internal power supply information, the main body has power supply means for supplying power to the imaging unit, and the input means is information from the imaging element information notification means. The information from the power information notification means is input together, and the power supply means changes the voltage or current of the power supplied to the imaging unit based on the information from the input means. The ophthalmic imaging apparatus described.   The ophthalmologic photographing apparatus according to claim 1, further comprising attachment / detachment detection means for detecting attachment / detachment of the imaging unit to / from the main body.

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