JP3412886B2 - Fundus camera - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera used in an ophthalmology clinic or the like for observing and photographing a fundus.

[0002]

2. Description of the Related Art In a conventional fundus camera of this type,
Light-shielding plates having different sizes are provided in the illumination optical system and the photographing optical system, and when the pupil for observation and photographing is small, the light-shielding plate having the smaller illumination optical system is selected.

[0003]

However, in the above-mentioned conventional example, when the smaller light shielding plate is selected,
The area illuminated by the illumination optical system is narrowed, and the observable area is also narrowed, which requires a lot of time for alignment, observation and photographing.

An object of the present invention is to solve the above-mentioned problems and to provide a fundus camera which can quickly perform alignment, observation and photographing even when the pupil is small.

[0005]

Means for Solving the Problems A fundus camera according to the present invention for achieving the above object comprises an illuminating means for illuminating an eye to be examined, an observing means for observing the eye, and a photographing means for photographing the eye. In the fundus camera, the illuminating means is provided with a light-shielding means for setting at least two types of pupil light flux passage areas near the pupil, and an illumination field diaphragm for setting at least two types of fundus illumination fields on the fundus. The means is provided with selecting means for selecting one of the pupil light flux passage areas, and the illumination field diaphragm is driven for selecting one of the fundus illumination fields according to the selection result of the selecting means and the operation of the photographing switch. Means are provided.

[0006]

In the fundus camera having the above-described structure, when the selecting means selects one of the pupil luminous flux passage areas, the light shielding means operates to set the pupil luminous flux passage area selected by the selecting means in the vicinity of the pupil. The driving means is operated in response to the operation of the selecting means and the photographing switch, and the illumination field diaphragm sets the fundus illumination field to the fundus in accordance with the light shielding means.

[0007]

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 a first embodiment, in which an objective lens 1 and a perforated mirror 2 are arranged in front of an eye E to be inspected, and a corneal baffle plate serving as an illumination optical system in an incident direction of the perforated mirror 2. 3a, 3, relay lens 4, illumination field stop 5, relay lens 6, lens baffle plates 7 and 7a, ring slit plate 8, condenser lens 9, photographing light source 10, condenser lens 11, infrared filter 12, and observation The light sources 13 are sequentially arranged.

Here, the corneal baffle plate 3 and the lens baffle plate 7 suitable for normal photographing are fixed, and together with the baffle plates 3 and 7, the corneal baffle plate 3a suitable for small pupil photographing.
The crystalline lens baffle plate 7a is movable. Further, the perforated mirror 2 is the anterior segment of the eye E to be examined with respect to the objective lens 1.
The perforated mirror 2 is substantially conjugated with Ef, and the perforated mirror 2 is substantially conjugated with the ring slit plate 8 with respect to the relay lens 4 and the relay lens 6. The ring slit plate 8 is made substantially conjugate with the pupil of the eye E to be inspected, the ring slit plate 8 is made substantially conjugate with the light source 10 for photographing with respect to the condenser lens 9, and the light source 10 for photographing is substantially with respect to the light source 13 for observation with respect to the condenser lens 11. It is conjugated. Furthermore, the corneal baffle plate 3
Reference numerals a and 3 are on-axis light-shielding plates which are conjugated with the position on the cornea side, and the crystalline lens baffle plates 7 and 7a are conjugated with the positions on the crystalline lens side of the anterior ocular segment Ef of the eye E to be inspected. It is an on-axis light shield.

The illumination field stop 5 is adapted to be movable in the optical axis direction in conjunction with the focus lens 14, is retracted from the optical path at the time of observation, and sets the illumination range as necessary at the time of photographing. Therefore, as shown by the arrow, it can be inserted and removed on the optical axis. A xenon discharge tube or the like is used as the photographing light source 10, a halogen lamp or the like is used as the observation light source 13, and the infrared filter 12 does not transmit visible light but emits near-infrared light. What is transparent to the part is used. On the other hand, behind the perforated mirror 2, the focus lens 14 of the observation and photographing optical system and the photographing lens group 1
5, the movable mirror 16, and the photographic film 17 are sequentially arranged. Here, the movable mirror 16 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 17.

Further, in the reflection direction of the movable mirror 16, a field lens 18 as an observation optical system and an imaging lens 1 are provided.
9. An infrared television camera 20 is sequentially arranged, and a television monitor 21 is connected to the output of the television camera 20. Here, the field lens 18 is substantially conjugate with the movable mirror 16 and the photographic film 17. Also,
A fundus image is formed on the imaging surface of the television camera 20, and the fundus image is visualized and displayed on the television monitor 21.

Further, the main ones of these constituent members are connected to the function control section 22. That is, the function control unit 22
There is provided a selection switch 23 which is composed of a micro switch and which selects normal photographing or small pupil photographing, and a photographing switch 24 which is composed of a push button switch and is used when photographing a fundus image. In addition, the corneal baffle plate 3a and the crystalline lens baffle plate 7a are connected to the function control unit 22 via a common solenoid 25, the illumination field diaphragm 5 is connected via a solenoid 26, and the light source 10 for photographing normally controls its light amount. It is connected via a light source control unit 27 which controls according to photographing or small pupil photographing, the movable mirror 16 is connected via a solenoid 28, and the television monitor 21 is further connected via a character synthesizing unit 29.

With such a configuration, when observing / photographing the fundus Er whose pupil diameter is not small, the selection switch 23
For normal shooting. As a result, the output of the function control unit 22 is transmitted to the solenoid 25, and the corneal baffle plate 3a
Then, the crystalline lens baffle plate 7a is retracted out of the optical path, and the fundus Er is illuminated within a normal range. The light flux emitted from the observation light source 13 in this state is the infrared filter 12, the condenser lens 11, the photographing light source 10, the condenser lens 9, the ring slit plate 8, the crystalline lens baffle plate 7, the relay lens 6, the illumination field diaphragm 5, The light passes through the relay lens 4 and the corneal baffle plate 3 sequentially, is reflected by the perforated mirror 2, and irradiates the fundus Er through the objective lens 1. The light flux reflected by the fundus Er passes through the objective lens 1, the perforated mirror 2, the focus lens 14, and the photographing lens group 15 and is reflected by the movable mirror 16. An image is formed, and a fundus image Er 'is projected on the television monitor 21 as shown in FIG.

When the photographing switch 24 is operated in this state, the output of the function control section 22 is sent to the solenoid 28 while the illumination field diaphragm 5 is retracted from the optical path, and the movable mirror 16 is raised as shown by the dotted line. And shooting film 17
A normal fundus image Er 'is photographed as shown in FIG.

On the other hand, when the mydriasis is not sufficient or the pupil is small, the selection switch 23 is selected to the small pupil. As a result, the output of the function control unit 22 is transmitted to the solenoid 25, the corneal baffle plate 3a and the crystalline lens baffle plate 7a are inserted into the optical path, and the illumination range of the fundus Er is narrowed. In such a state, the fundus image Er 'is displayed on the television monitor 21 in the same observation range as in the normal photographing. It is sent to the output character synthesizing unit 29 of the function control unit 22, and as shown in FIG. 4, the television monitor 21 is in the small pupil image capturing state with the optotype M1 indicating the fundus photographing recording range by the output of the character synthesizing unit 29. The symbol S indicating is displayed. By this,
It is possible to identify which part of the fundus Er has been photographed, and it is possible to prevent photographing failure.

When the photographing switch 24 is operated,
The illumination field diaphragm 5 is inserted into the optical path by the output of the function control unit 22, the movable mirror 16 is raised, and the light amount of the photographing light source 10 is increased via the light source control unit 27 to perform photographing, and FIG. As shown, the fundus image Er 'is photographed on the photographing film 17.

FIG. 6 is a block diagram of the second embodiment, which shows the first
Instead of the display by the optotype M in the embodiment, the display is made in the field of view of the finder, and the mark plate 30 is arranged in the optical path in front of the field lens 18 in place of the character synthesizing section 29 so as to be freely inserted and removed. The mark plate 30 is made of a transparent plate and has an opaque boundary line mark M2 indicating a recording range at the time of photographing a small pupil as shown in FIG. The mark plate 30 is arranged so as to form an image on the image pickup surface of the television camera 20, and is connected to the function control unit 22 via a solenoid 31.

When the small pupil photographing is selected by the selection switch 23, the output of the function control section 22 is sent to the solenoid 31, the mark plate 30 is moved on the optical axis, and the television monitor 21.
A fundus image Er 'on which the mark image M2 is superimposed is displayed on. Other functions and effects are similar to those of the first embodiment.

[0018]

As described above, in the fundus camera according to the present invention, by selecting one of the pupil light flux passage areas by the selection means, the light shielding means sets the pupil light flux passage area in the vicinity of the pupil and is driven simultaneously. The means operates in response to the selecting means, and the illumination field diaphragm sets the fundus illumination field corresponding to the pupil light flux passage area to the fundus.For example, when observing / photographing a small pupil, the selecting means selects the small pupil. The fundus illumination field can be optimally set only by selecting an appropriate pupil light flux passage region, and the fundus can be rapidly observed over a wide range and good imaging can be performed.

[Brief description of drawings]

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

FIG. 2 is a fundus image on a television monitor during normal shooting.

FIG. 3 is a fundus image on a television monitor when photographing a small pupil.

FIG. 4 is a fundus image on a photographic film during normal photography.

FIG. 5 is a fundus image on a photographic film at the time of photographing with a small pupil diameter.

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

FIG. 7 is a plan view of a mark plate.

[Explanation of symbols]

1 Objective lens 2 perforated mirror 3,3a corneal baffle plate 5 Lighting field diaphragm 7,7a Lens baffle 10 Photographic light source 13 Observation light source 16 movable mirror 17 Shooting film 20 TV camera 21 TV monitor 22 Function controller 23 Selection switch 24 Shooting switch 27 Light source controller 29 Character Composition Department 30 mark plate

Continuation of the front page (56) Reference JP-A-3-128038 (JP, A) JP-A-56-143138 (JP, A) JP-A-5-15497 (JP, A) JP-A-2-63430 (JP , A) JP 60-176621 (JP, A) JP 60-68828 (JP, A) JP 63-212323 (JP, A) JP 54-12195 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) A61B 3/00-3/16

Claims (3)

(57) [Claims] 1. A fundus camera comprising an illuminating means for illuminating an eye to be examined, an observing means for observing the eye to be examined, and a photographing means for photographing the eye to be examined, wherein the illuminating means has at least two types of pupils near a pupil. Shading hands to set the light flux passage area
At least two types of fundus illumination field are set on the corrugation and the fundus.
A diaphragm illumination field provided, the light shielding means is provided selection means for selecting one of said pupil light beam passage region, narrowing the illumination field
Fundus camera, characterized in that a driving means for selecting one of said fundus illumination field depending on the selection result and the operation of the shooting switch of the selecting means to Ri. 2. The fundus camera according to claim 1, wherein the observing unit has a photographing range display unit for displaying a photographing range. 3. The illumination means has a changing means for changing the light quantity of the photographing light source, and changes the light emission quantity of the photographing light source according to the selection of the selecting means and the driving means. The fundus camera according to claim 1.