JPH0810229A - Ophthalmological photographing device - Google Patents

Abstract

PURPOSE:To quickly perform alignment, eyeground observation and eye-ground photographing even when the diameter of a pupil is small. CONSTITUTION:When the diameter of the pupil is small, a cornea baffle plate 7a and a crystal lens baffle plate 11a are saved outside an optical path by a function control part 27, and also, the diaphragm, 9 of illumination for small pupil photographing is saved outside the optical path. Also, a movable mirror 21 is saved from the optical path as shown in dotted line, and the luminous flux of a fixed sight target light source 23 whose projecting position is fixed for ordinary photographing is shielded by the movable mirror 21, therefore, only a fixed sight target light source 22 whose projecting position is adjustable can be recognized visually by a person to be inspected, and an eyeground image can be introduced to a desired position. When a photographing switch 29 is operated, the diaphragm 9 of illumination for small pupil photographing is inserted to the optical path, and a movable mirror 5 is raised as shown in dotted line, and moreover, photographing is performed by adjusting the light quantity of a light source 14 for photographing via a light source control part 35, and the eyeground image when the diameter of the pupil is not small can be photographed on the film 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic photographing apparatus used in an ophthalmology clinic or the like for observing and photographing an eye to be examined.

[0002]

2. Description of the Related Art Conventionally, in an ophthalmologic photographing apparatus, for example, a fundus camera, it has been proposed to provide a fixation target in order to photograph a fundus photograph of a predetermined part of an eye to be examined. Furthermore,
When the pupil for observation / photographing is small, a light-shielding plate smaller than the light-shielding plate used for normal observation / photographing is used for the illumination optical system for observation / photographing.

In such photographing, the range illuminated by the illumination optical system is narrowed, and the photographing range is also narrowed. Therefore, when the observation target is photographed using the fixation target whose photographing position is fixed for ordinary photographing, In some cases, a fundus photograph of the desired part cannot be obtained. Therefore, the examiner selects a fixation target whose projection position is arbitrary and guides the eye to a position where a fundus photograph of a desired portion is taken to perform observation / imaging.

[0004]

However, in the above-mentioned conventional example, a switching operation between the fixation target whose projection position is fixed for normal photographing and the fixation target whose projection position is arbitrary is required, There is a problem that it takes a lot of time for alignment, observation and photographing.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide an ophthalmologic photographing apparatus that can quickly perform alignment, observation, and photographing even when the pupil is small.

[0006]

In order to achieve the above object, an ophthalmologic photographing apparatus according to the present invention comprises an illuminating means for illuminating a fundus of an eye to be examined, an observing means for observing the fundus, and a photographing for photographing the eye. Means, a fixation target projection means for projecting a fixation target onto the eye to be examined, and a light shielding means for setting at least two types of fundus illumination fields on the fundus, wherein the light shielding means comprises the fundus illumination fields. And a changing means for changing the projection position of the fixation target in association with the selection means.

[0007]

In the ophthalmologic photographing apparatus having the above-mentioned structure, one of the at least two types of fundus illumination fields is set on the fundus by the selection means for selecting the light shielding means, and the selection means interlocks with this. The projection position of the fixation target is changed by the changing unit provided in the fixation target projecting unit to perform fundus imaging.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 is a configuration diagram of the first embodiment. In front of the eye E to be inspected, an objective lens 1, a perforated mirror 2, a focus lens 3 of an observation / photographing optical system, a photographing lens group 4, a movable mirror 5, and photographing. The films 6 are arranged in sequence. Here, the movable mirror 5 is inserted into the optical path at the time of observation, and retracted outside the optical path at the time of photographing. A shutter (not shown) is provided in front of the photographic film 6.

The illumination optical system arranged in the incident direction of the perforated mirror 2 includes a corneal baffle plate 7a, 7, a relay lens 8, an illumination field diaphragm 9 for photographing a small pupil, a relay lens 10, a lens baffle plate 11, 11a. , Ring slit plate 12,
The condenser lens 13, the photographing light source 14, the condenser lens 15, the infrared filter 16, and the observation light source 17 are sequentially arranged.

Here, the corneal baffle plate 7 and the crystalline lens baffle plate 11 are fixed on the optical path, and the corneal baffle plate 7 is fixed.
a and the crystalline lens baffle plate 11a are movable in the arrow direction. The baffle plates 7 and 11 are used for photographing a small pupil, and the baffle plates 7a and 1 are used for normal photographing.
Photographing is performed by adding 1a.

The perforated mirror 2 is substantially conjugate with the anterior segment Ef of the eye E with respect to the objective lens 1, and is also substantially conjugate with the ring slit plate 12 with respect to the relay lens 8 and the relay lens 10. The ring slit plate 12 is substantially conjugate with the pupil of the eye E to be examined, the condenser lens 13 is substantially conjugate with the photographing light source 14, and the photographing light source 14 is substantially conjugate with the condenser light source 15 for observation. . Further, the corneal baffle plates 7 and 7a are on-axis light-shielding plates conjugated with the position on the cornea Ec side, and the crystalline lens baffle plates 11 and 11a are closer to the crystalline lens side than the ring slit image in the anterior segment Ef of the eye E to be examined. It is a shading plate on the axis which is conjugated with the position of.

Then, the illumination field diaphragm 9 for photographing a small pupil is set so that it can be inserted / removed on the optical axis as shown by an arrow in order to set the illumination range at the time of photographing a small pupil, and is linked with the focus lens 3 to emit light. It is designed to be movable in the axial direction. A xenon discharge tube or the like is used as the photographing light source 14,
A halogen lamp or the like is used as the observation light source 17, and an infrared filter 16 having a characteristic of transmitting most of the near-infrared light without transmitting visible light is used as the infrared filter 16.

Further, in the observation optical system arranged in the reflection direction of the movable mirror 5, a field lens 18, a half mirror 19, an imaging lens 20, a movable mirror 21 retractable outside the optical path, and a projection position can be adjusted. A fixation target light source 22 composed of an LED is arranged, and in the reflection direction of the movable mirror 21,
A fixation target light source 23 whose projection position is fixed for normal photographing is arranged. An imaging lens 24 and an infrared television camera 25 are sequentially arranged in the reflection direction of the half mirror 19, and the output of the infrared television camera 25 is connected to a television monitor 26. Here, the field lens 18 is substantially conjugate with the photographic film 6 with respect to the movable mirror 5.

The main components of these components are connected to the function control unit 27. That is, a selection switch 2 which is made up of a micro switch and which selects normal photographing or small pupil photographing
8 and a photographing switch 29, which is composed of push button switches and is used when photographing a fundus image, is connected to the function control unit 27. The output of the function control unit 27 is the corneal baffle plate 7
a and a solenoid 3 for driving the lens baffle plate 11a
0, a solenoid 31 for inserting / removing the illumination field stop 9 for photographing a small pupil into the optical path, a solenoid 33 for driving the movable mirror 5, a solenoid 34 for driving the movable mirror 21, and a light amount of the photographing light source 14 for normal photographing or small pupil. It is connected to a light source control unit 35 that controls according to shooting, and further, the character synthesizing unit 3
It is connected to the infrared television camera 25 via 6.

When observing / photographing the fundus Er of the subject's eye E whose pupil diameter is not small, when the normal photographing is selected by the selection switch 28, the corneal baffle plate 7a and the crystalline lens baffle plate 11a are inserted into the optical path, and the small size. The pupil field illumination field diaphragm 9 is retracted outside the optical path. The light flux emitted from the observation light source 17 is an infrared filter 16, a condenser lens 15, a photographing light source 14, a condenser lens 13, a ring slit plate 12, crystalline lens baffle plates 11 a and 11, a relay lens 1.
0, 8 and the corneal baffle plates 7, 7a are sequentially passed through and reflected by the perforated mirror 2 to irradiate the fundus Er through the objective lens 1.

The light flux reflected by the fundus Er is the objective lens 1,
Perforated mirror 2, focus lens 3, shooting lens group 4
It is reflected by the movable mirror 5 through the field lens 1
An image is formed on the television camera 25 via the 8, the half mirror 19 and the imaging lens 24, and the fundus image Pr is displayed on the television monitor 26 as shown in FIG.

Here, the movable mirror 21 is at the position shown by the solid line, and the light flux of the fixation target light source 22 whose projection position is adjustable is blocked by the movable mirror 21. Only the fixation target light source 23 whose projection position is fixed is visually recognized. A part of the luminous flux from the fixation target light source 23 whose projection position is fixed is reflected in the returning direction by the field lens 18, and the half mirror 1
9. The image is formed on the image pickup surface of the infrared television camera 25 through the imaging lens 24, and is displayed on the television monitor 26 as the visual target image P1 overlapping the fundus image Pr, and the examiner is the subject's eye. E
It is possible to confirm at which position the target image P1 is visually recognized.

When the photographing switch 29 is operated in this state, the output of the function control section 27 is transmitted to the solenoid 33, the movable mirror 5 is raised as shown by the dotted line, and the photographing film 6 is normally moved as shown in FIG. Fundus image Pr for shooting
Will be taken.

On the other hand, when the mydriasis is insufficient or the pupil is small, when the selection switch 28 is selected for small pupil imaging, the output of the function control section 27 is transmitted to the solenoid 30, and the corneal baffle plate 7a and the crystalline lens baffle. The plate 11a is retracted out of the optical path, and the illumination field diaphragm 9 for small pupil imaging is also retracted out of the optical path. Here, as shown in FIG. 4, the fundus image Pr is displayed on the television monitor 26 in the same observation range as in the normal photographing.

The output of the function controller 27 is transmitted to the solenoid 34, and the movable mirror 21 is retracted from the optical path as shown by the dotted line. Here, since the light flux of the fixation target light source 23 whose projection position is fixed for normal imaging is blocked by the movable mirror 21, the subject visually recognizes only the fixation target light source 22 whose projection position is adjustable. To be done. A part of the light flux from the fixation target light source 22 whose projection position is adjustable is reflected in the returning direction by the field lens 18, passes through the half mirror 19 and the imaging lens 24, and is formed on the image pickup surface of the infrared television camera 25. And is displayed on the television monitor 26 as the target image P2 overlapping the fundus image Pr, and the examiner confirms at which position of the eye E the subject is viewing the target image P2. You can

Further, the output of the function control section 27 is transmitted to the character synthesizing section 36, and an optotype M indicating the fundus recording range,
The optotype symbol S indicating that it is in the small pupil photographing state is displayed. As a result, the fundus image Pr can be observed in the same observation range as in normal imaging, and the fundus image Pr can be guided to a desired position by the fixation target light source 22 whose projection position is adjustable.

When the photographing switch 29 is operated,
The output of the function control unit 27 is the solenoid 31 and the solenoid 3.
3, the small pupil photographing illumination field diaphragm 9 is inserted into the optical path, the movable mirror 5 rises as shown by the dotted line, and the light amount of the photographing light source 14 is adjusted via the light source control unit 35. Photographing is performed, and a fundus image Pr of small pupil photographing is photographed on the photographing film 6 as shown in FIG.

Therefore, in this embodiment, the fixation target required for small pupil imaging is automatically presented in association with the selection of small pupil imaging, so that the handling of the apparatus is simplified and anyone can operate for a short time. Can easily perform fundus imaging.

FIG. 6 is a block diagram of the second embodiment, which shows the first
A fixed half mirror 51 is provided in place of the movable mirror 21 and the solenoid 34 of the above embodiment, and instead of the fixation target light source 22 whose projection position is adjustable, the projection position is fixed for small pupil imaging. A target light source 52 is provided. Further, dimming devices 53 and 54 are connected to the fixation target light source 52 for small pupil photographing and the fixation target light source 23 for normal photographing, respectively.

When observing / photographing the fundus Pr of the subject's eye E whose pupil diameter is not small, when normal photographing is selected by the selection switch 28, the output of the function control section 27 is output from the dimmer 5.
3, 54, the fixation target light source 23 whose projection position is fixed for normal imaging is turned on, and the fixation target light source 52 whose projection position is fixed for small pupil imaging is turned off or dimmed. Therefore, the subject sees only the fixation target light source 23 whose projection position is fixed for normal imaging reflected by the half mirror 51.

On the other hand, when the mydriasis is not sufficient or the pupil is small, when the selection switch 28 is selected for the small pupil photographing, the output of the function control section 27 is transmitted to the dimmers 53 and 54, and the small pupil photographing is performed. The fixation target light source 52 whose projection position is fixed for lighting is turned on, and the fixation target light source 23 whose projection position is fixed for normal imaging is turned off or dimmed. Only the fixation target light source 52 whose projection position is fixed for photographing a small pupil that has passed through 51 is visually recognized.

Therefore, also in the second embodiment, as in the first embodiment, the handling of the apparatus is simplified, and fundus imaging can be easily performed in a short time.

[0028]

As described above, since the ophthalmologic photographing apparatus according to the present invention presents the fixation target necessary for the selected fundus illumination field in association with the selection of the fundus illumination field, the apparatus can be handled easily. Simplified and easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is an explanatory diagram of a fundus image on a television monitor during normal shooting.

FIG. 3 is an explanatory diagram of a fundus image on a photographic film during normal photography.

FIG. 4 is an explanatory diagram of a fundus image on a television monitor when photographing a small pupil.

FIG. 5 is an explanatory diagram of a fundus image on a photographing film when photographing a small pupil.

FIG. 6 is a configuration diagram of a second embodiment.

[Explanation of symbols]

 1 Objective Lens 2 Perforated Mirror 5, 21 Movable Mirror 6 Photographic Film 7, 7a, 11, 11a Baffle Plate 9 Illumination Field Aperture 14, 17 Light Source 22, 23, 52 Fixation Target Light Source 25 Television Camera 26 Television Monitor 27 Function Control Section 28 selection input section 29 shooting switch 35 light source control section 36 character combining section 51 half mirror 53, 54 dimmer

Claims (3)

[Claims] 1. An illuminating means for illuminating a fundus of an eye to be examined, an observing means for observing the eye to be examined, a photographing means for photographing the eye to be examined, a fixation target projecting means for projecting a fixation target on the fundus, and a fundus. In a fundus camera equipped with a light blocking means for setting at least two kinds of fundus illumination fields, a selection means for selecting one of the fundus illumination fields for the light blocking means, and a selection means for the fixation target projection means. An ophthalmologic photographing apparatus, comprising: a changing unit that changes the projection position of the fixation target in conjunction with. 2. The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target can be projected at an arbitrary projection position. 3. The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target can be projected at at least two kinds of projection positions.