JPH10113336A - Ophthalmologic photographing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable efficient photographing by indicating a fixed sight target to an arbitrary fixed position. SOLUTION: The indicating position of a fixed sight target is controlled by an operation switch 7 through a CPU 19 to an arbitrary position, and the fixed sight targets for the right and left eyes are independently controlled in accordance with the detecting condition of a detection switch 21 for storing them into a memory 20 right and left separately. Then, the insertion and extraction of a front-eye-observing lens 9 is controlled by a front-eye/eyeground observation changeover switch 6, and in the front-eye-part observing condition where the front-eye-observing lens 9 is inserted into the optical path, the input of the operation switch 7 is invalidated, and the indicating position of the fixed sight target is not changed. Further, in the front-eye observing condition, the input of the operation switch 7 is invalidated, and even if the operation switch 7 is operated, the indicating position of the fixed sight target is not changed. Since the fixed sight target is always indicated so as to be fixed to the same position in this way, the photographing in the same photographing range can be enabled.

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 for photographing a fundus image or the like in an ophthalmic clinic or the like.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 52-102029, a fixation target is arranged at a conjugate position of a fundus of an optical system by branching from an observation optical system, and an operating member such as a lever is provided. There is known an ophthalmologic photographing apparatus configured so that the presenting position of the fixation target can be freely adjusted by using the camera.

[0003]

However, when performing a group examination or the like in the above-mentioned conventional ophthalmologic imaging apparatus, the imaging range is generally set such that the middle contact between the optic disc and the macula is located at the center of the screen. The distance between the optic disc and the macula and the positional relationship between the optic discs and the macula vary greatly between individuals, so that fine adjustment is required according to the purpose of the eye to be examined or the photographer. For this reason, the presenting position of the fixation target may move when performing input of the operation member, and may erroneously largely deviate from the normal use position at times other than the time of fundus observation. The presentation position must be moved greatly, and the subject must also move his or her eyes. For this reason, the pupil of the eye to be examined and the optical axis of the imaging optical system need to be shifted to perform alignment again, and the diopter of the eye to be examined needs to be adjusted again to perform focus adjustment, which makes the operation complicated. There is a problem that the shooting efficiency is deteriorated.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an ophthalmologic photographing apparatus capable of presenting a fixation target at an arbitrary fixed position and performing efficient photographing.

[0005]

An ophthalmologic photographing apparatus according to the present invention for achieving the above object provides a fixation target presenting means for presenting a fixation target to a subject, and a presentation position of the fixation target. It is characterized by having an operating means for controlling and a valid / invalid selecting means for selecting valid / invalid of the operating means.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a perspective view of the first embodiment, and FIG. 2 is a configuration diagram of an optical system. In FIG. 1, a movable stage 2 is mounted on a base 1 having a built-in electrical unit. A main body unit 3 having a built-in optical system and a television monitor 4 are fixed on the upper side, and an operation stick 5, an anterior segment / fundus observation changeover switch 6, and a fixation target operation switch 7 are provided on the examiner side.

As shown in FIG. 2, an objective lens 8 and an insertable / removable anterior ocular segment observation lens 9 for inserting into the optical path O1 and observing the anterior segment are disposed on the observation optical path O1 of the eye E to be inspected. , A perforated mirror 10, a focusing lens 11 movable in the direction of the optical path O1 at the time of focus adjustment, a photographing lens 12, reflecting visible light and transmitting infrared light, and within the optical path O1 during observation and outside the optical path at the moment of photographing. The switching mirror 13 and the imaging means 14 that are separated are sequentially arranged, and a light source 15 for anterior ocular segment emitting visible light is arranged around the objective lens 8.

An optical path O2 perpendicular to the optical path O1 of the perforated mirror 10.
A known fundus illumination optical system (not shown) is arranged on the upper side, and the fundus illumination optical system irradiates infrared light at the time of fundus observation and visible light at the time of fundus photographing.
On the optical path in the reflection direction of the switching mirror 13, a liquid crystal display 16 for displaying a fixation target,
An illumination light source 17 that illuminates 6 from behind is arranged.

The output of the image pickup means 14 is connected to the television monitor 4 and the CPU 19 via the image control means 18,
The output of U19 is connected to the liquid crystal display means 16 and the memory 20. When a non-volatile memory is used as the memory 20, the state can be stored even when the power is not turned on. Then, a changeover switch 6 for controlling the insertion and removal of the anterior ocular segment observation lens 9 into and from the optical path, an operation switch 7 for controlling a means for presenting a fixation target, and a left and right eye detection switch 2
1. Each output of the photographing switch 22 and the power switch 23 is connected to the CPU 19.

The presenting position of the fixation target is controlled to an arbitrary position by the operation switch 7 via the CPU 19, and the fixation target for the left and right eyes can be independently controlled in accordance with the detection state of the detection switch 21. Yes, separate memory 20 for left and right eyes
Is stored. In addition, the anterior ocular segment observation lens 9 is
In the anterior ocular segment observation state where the anterior segment observing lens 9 is inserted in the optical path, the input of the operation switch 7 is invalidated, and the presentation position of the fixation target is changed. It does not change.

Further, the imaging means 14 outputs a video signal when observing a moving image, and this video signal is displayed on the television monitor 4 via the image control means 18. The imaging unit 14 outputs a still image, which is input to the image control unit 18 and stored in the built-in image memory, and then reproduced on the television monitor 4.

First, the examiner operates the power switch 23 to start the operation of the main body. Then, the main body starts operating in the anterior segment observation state. Therefore, first, while observing the anterior eye part, the positioning is performed so that the observation photographing optical path O1 passes through the center of the pupil Ep of the eye E to be examined. In the anterior ocular segment observation state, the anterior ocular segment observing lens 9 is inserted into the optical path, the anterior ocular segment illumination light source 15 is turned on, and the switching mirror 13 is retracted outside the optical path. In this state, the anterior ocular segment image illuminated with visible light by the anterior ocular segment illumination light source 15 includes the objective lens 8 and the perforated mirror 10.
Through the aperture, the focusing lens 11 and the photographing lens 12 to form an image on the imaging surface 14a of the imaging means 14 and converted into a video signal.
The image is displayed as a color image on the television monitor 4 via the image control means 18.

The examiner operates the operation rod 5 while watching the image displayed on the television monitor 4, and operates the main body 3 having an optical system therein.
Is moved on the base 1, and the eye is to be photographed, for example, the right eye. When the positioning is completed and the changeover switch 6 is operated to switch to the fundus oculi observation state, the anterior ocular segment illumination light source 15 is turned off, the anterior ocular segment observation lens 9 is retracted out of the optical path, and the switching mirror 13 is moved to the optical path. A known fundus illumination optical system emits infrared light to present a fixation target for right-eye imaging.

The infrared light emitted from the fundus illumination optical system illuminates the fundus Er from the pupil Ep through the mirror section around the perforated mirror 10 and the objective lens 8. The illuminated fundus image passes from the pupil Ep through the objective lens 8, the hole of the perforated mirror 10, the focusing lens 11, the photographing lens 12, and the mirror 13, and forms an image on the imaging surface 14a of the imaging means 14. This fundus image is converted into a video signal, and is displayed on the television monitor 4 via the image control means 18, and the examiner sees this video and confirms the shooting range and the like.

As shown in FIG. 3, the liquid crystal display means 16 is controlled so that only a part of the area A transmits light.
The other area B blocks light. The examiner can move the light transmitting area A to an arbitrary position by operating the operation switch 7, and transmits the light transmitted from the light source 17 for illumination through the light transmitting area A of the liquid crystal display unit 16. The light
The light is reflected by the switching mirror 13, passes through the taking lens 12, the focusing lens 11, the hole of the perforated mirror 10, and the objective lens 8, and reaches the fundus Er from the pupil Ep of the eye E to be examined. That is, for a subject having the pupil Ep arranged on the optical path O1 of the objective lens 8,
An image of the light transmission area A is presented as a fixation target for the right eye in a dark background, and the image control unit 18 displays the character image at a position corresponding to the light transmission area A on the television monitor 4 as shown in FIG. C is displayed superimposed on the fundus image.

To correct the photographing range, the examiner operates the operation switch 7 to change the position of the light transmitting area A,
Along with this, the character image C on the television monitor 4 also moves. As a result, the position of the fixation target for the right eye moves, and the subject can change the imaging range by following the position with the eyes. In this way, the examiner operates the operation switch 7 to guide the eye E to be examined, thereby obtaining the fundus oculi.
It becomes possible to photograph an arbitrary position of Er.

After confirming the imaging part, the examiner operates the imaging switch 22. As a result, the switching mirror 13 retreats out of the optical path, the imaging means 14 starts accumulation of light for photographing a still image, the fundus illumination optical system emits visible light, and the fundus Er of the eye E to be examined receives infrared light. As in the case, it is illuminated by this visible light flux. The fundus image illuminated in this way passes through the same path as that of the infrared light flux, further passes by the switching mirror 13 retracted out of the optical path, forms an image on the imaging means 14, and the still image is subjected to image control. The data is converted into digital data by the means 18, stored in the image memory of the image control means 18, and displayed on the television monitor 4.

The photographing of the right eye is completed, the operation returns to the anterior segment observation state in preparation for the next photographing, and the position of the fixation target for the right eye is stored in the memory 20. Then, the examiner operates the operating rod 5
Is operated to adjust the position of the main body to the next photographing eye, for example, the left eye. The left / right detection switch 21 detects this left / right movement, whereby the CPU 19 recognizes that the next eye to be photographed is the left eye. Here, a fundus observation state is set and a fixation target for the left eye is presented. The presenting position of the fixation target at this time is the position stored in the memory 20 when the mode is switched to the anterior segment observation after the previous left-eye imaging, and is between the end of the previous left-eye imaging and the current left-eye imaging. The input to the operation switch 7 at the time of observing and photographing the anterior ocular segment or the observation of the fundus of the right eye does not affect the presentation position of the fixation target for the left eye. When a non-volatile memory is used as the memory 20, even if the power switch 23 is turned off in the middle, it is presented at the same position as the previous time. Since the operation switch 7 is effective in the fundus observation state, the presenting position of the fixation target for the left eye can be moved to an arbitrary position by the operation switch 7.

Similarly, the presentation position of the fixation target for the right eye is
Memory 2 when switching to anterior segment observation after right eye imaging last time
0, and the input to the operation switch 7 at the time of observing the anterior ocular segment or observing and photographing the left fundus between the end of the previous right eye photographing and the present right eye photographing is the position for the right eye. It does not affect the presentation position of the fixation target.

In the above-described embodiment, the presenting position of the fixation target when the mode is switched to the anterior segment observation is stored in the memory 20. In addition, the presenting position of the fixation target at the time of photographing may be stored, so that the same photographing range as the previous time can be photographed more accurately.

The left / right detection switch 2 in the embodiment
1. By providing means for selecting whether the operation switch 7 for changing the fixation target presentation position is valid or invalid, such as the changeover switch 6 and the photographing switch 22, the fixation target presentation position is moved only when necessary. Can be prevented from moving by mistake, and even when the operation switch 7 for operating the fixation target is inadvertently operated, such as when observing the anterior eye or when the power is not turned on, the fixation target is presented next. Since the position of the fixation does not change, it is possible to always present the fixation target at the same position as the previous photographing.

Further, by providing the memory 20 for storing the fixation target presentation position, the fixation target can be presented at the same position as the previous time, and the fixation target presentation positions for the left and right eyes are independently stored. By doing so, there is no need to switch the fixation target presentation position according to the left and right eyes using the operation switch 7, and an efficient examination can be performed.

FIG. 5 is a perspective view of the second embodiment, and FIG. 6 is a configuration diagram of an optical system. The same reference numerals as those in the first embodiment denote the same members. In the present embodiment, a valid / invalid selection switch 30 for selecting valid / invalid is provided at the upper end of the operation switch 7 including an operation rod which can be tilted in an arbitrary direction. ,
The fixation target can be fixed and used at an arbitrary position.

First, after the operation switch 7 is turned down to present a fixation target at an arbitrary position, the valid / invalid selection switch 3
When 0 is operated, the input to the operation switch 7 becomes invalid, and even if the operation switch 7 is operated, the presenting position of the fixation target does not change. Therefore, the valid / invalid selection switch 30 is again activated.
Since the fixation target is always fixedly presented at the same position until is operated, it is possible to take an image in the exact same imaging range, and it is possible to improve the efficiency of diagnosis.

By providing both the valid / invalid selection switch 30 and the anterior eye / fundus observation changeover switch 6,
Since the operation switch 7 can be enabled only when it is really necessary by a simple operation, the efficiency of photographing can be improved. In addition, when the operation switch 7 is valid, an optotype D indicating that the operation switch 7 is valid is displayed on the television monitor 4 so that the user can know at a glance whether the operation switch 7 is valid or invalid, thereby further improving usability. Can be done.

Further, by using the operation switch 7 as an operation rod, the position of the fixation target is moved according to the direction in which the operation rod is tilted to correct the photographing range, and the valid / invalid selection switch 30 is set at the upper end of the operation rod. Since it can be easily operated at hand, it is even more convenient to use.

[0027]

As described above, the ophthalmologic photographing apparatus according to the present invention is provided with means for selecting the valid / invalid of the operation switch for changing the fixation target presentation position. Since the presentation position can be moved, it does not move too much, and the shooting efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a fundus camera according to a first embodiment.

FIG. 2 is a configuration diagram of an optical system.

FIG. 3 is a front view of the liquid crystal.

FIG. 4 is an explanatory diagram of a fundus image and a target on a television monitor.

FIG. 5 is a perspective view of a second embodiment.

FIG. 6 is a configuration diagram of an optical system.

[Explanation of symbols]

 Reference Signs List 4 TV monitor 5 Operation stick 6 Anterior eye / fundus observation changeover switch 7 Operation switch 9 Anterior eye observation lens 14 Imaging means 15 Illumination light source 16 Liquid crystal display means 18 Image control means 20 Memory 21 Left / right detection switch 22 Shooting switch 30 Enable / disable selection switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Nishihara 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Takeshi Kitamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (72) Inventor Tetsuji Ogawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (6)

[Claims] 1. A fixation target presenting means for presenting a fixation target to a subject, an operation means for controlling a presentation position of the fixation target, and a valid / invalid selection for selecting valid / invalid of the operation means. An ophthalmologic photographing apparatus comprising: 2. An observation means for selectively observing a fundus or an anterior eye of a subject, and an observation part selecting means for selecting an observation part by the observation means, wherein the valid / invalid selection means is 2. An observation part selecting means, wherein said operation means is effective only when a fundus is selected as an observation part.
An ophthalmologic photographing apparatus according to item 1. 3. A storage means for storing a position at which a fixation target is presented when anterior segment observation is selected by the observation region selection means, wherein the fixation target presentation means performs fundus observation next. 3. The ophthalmologic photographing apparatus according to claim 2, wherein a fixation target is presented at a position stored in said storage means when selected. 4. A photographing means for photographing a still image of an eye to be inspected, and a memory means for storing a position at which a fixation target is presented when a still image is photographed by the photographing means. 3. The ophthalmologic imaging apparatus according to claim 2, wherein the target presentation means presents a fixation target at a position stored in the storage means when the fundus observation is selected next time. 5. A fixation target for judging whether an eye to be imaged is a right eye or a left eye, wherein the storage means sets a fixation target for a right eye photograph and a left eye photograph as a fixation target presentation position. Are independently stored, the fixation target presenting means presents a fixation target corresponding to the discrimination of the discriminating means, and the input to the operating means is for right-eye photographing in the right-eye fundus observation state. 5. The ophthalmologic imaging apparatus according to claim 3, wherein only the fixation target is effective, and the left eye fundus observation is effective only for the left eye fixation target. 6. The ophthalmologic photographing apparatus according to claim 3, wherein said storage means is a nonvolatile memory.