JPS6029130A - Ophthalmic photographing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ophthalmological photographing apparatus that is capable of performing fluorescent ophthalmological photographing, can set a plurality of observation photographing modes, and can appropriately select a predetermined mode.

Fluorescent fundus photography, which is known as a type of ophthalmologic imaging, illuminates the fundus with blue excitation light, timing the time when a fluorescent agent injected through the cubital vein reaches the intraocular circulation system, and detects the inside of the blood vessels. This is done by photographing the green-yellow fluorescence emitted by the fluorescent agent.

At that time, an exciter filter having wavelength light transmittance characteristics as shown in a in Fig. 1 is inserted into the illumination optical path, and a barrier filter with characteristics as shown in b in Fig. 1 is inserted in the photographing optical path. It is necessary to.

When shooting, a high-intensity strobe is emitted with both the exciter filter and barrier filter inserted into the optical path.However, when observing alignment and focusing, two filters are inserted into the optical path as when shooting. When observed under illumination with an observation light source, the fluorescent light is so weak that the field of view is extremely dark with normal light source brightness, making it difficult to observe adequately. Therefore, the brightness of the observation light source is increased to a predetermined brightness for observation. Clinically, it is considered important to perform observation in the same state as in fluorescence fundus photography, that is, with both the exciter filter and barrier filter inserted in the optical path. If the subject is glared at (especially common among eye patients), the mode will not be appropriate. Therefore, it is desirable to select a cherry blossom viewing photography mode of 4 Jl so that adjustment and focusing can be performed using weak illumination light depending on the subject, and an exciter filter and a barrier filter can be inserted into the optical path only during photography. It is also clinically useful for the examiner to be able to select an appropriate observation and photographing mode according to the subject.

In view of this, the present invention has an operating means for automatically inserting and removing the exciter filter and barrier filter into the optical path, and the operating means is capable of setting a plurality of operating states and selects a different operating state. It is characterized by being equipped with a selection means. The present invention will be explained in detail below.

Figure 2 is a configuration diagram showing the optical system of an ophthalmological camera.
is an observation light source consisting of a tungsten lamp, etc.; light emitted from this tungsten lamp 1 enters a mirror 4 via a condenser lens 2a, a photographing light source 3 consisting of a xenon discharge tube, etc., and a condenser lens 2b; It is deflected and reaches the perforated mirror 8 via the exciter filter 5, the ring slit plate 6, and the relay lenses 7a and 7b. Incidentally, reference numeral 9 denotes a reflecting mirror arranged behind the observation light source 1 to collect and reflect the light from this lamp. The light incident on the perforated mirror 8 from the above-mentioned illumination optical system is reflected by the perforated mirror 8 in the direction of the eye E to be examined, illuminates the fundus Ef of the eye E to be examined, passes through the original optical path, and then returns to the perforated mirror 8. 8 and reaches the observation optical system. An objective lens 10 is arranged between the perforated mirror 8 and the subject's eye E, and behind the perforated mirror 8, along the optical axis, a barrier filter 11, a focusing lens 12,
A photographic lens group 13, a movable mirror 14, a shutter 15, and a photographic film 16 are arranged in sequence. Movable mirror 1
Photographic film 16 is sequentially placed on the reflective side of 4 along the optical axis.
A field lens 17 placed at a position conjugate with , a mirror 18 for changing the optical path, and a finder 19 are arranged.

Note that e is the examiner's eye.

Here, the exciter filter 5 is automatically inserted into the illumination optical path by the solenoid 21 during fluorescence photography, and removed out of the optical path during other photography.
Its operation is confirmed by microswitch S1. Further, the barrier filter 11 is automatically inserted into and removed from the photographing optical path by driving the solenoid 20.

In this ophthalmological camera, the observation light source 1 and the photographing light source 3 are substantially conjugate with respect to the condenser lens 2a, so that the observation light source 1 is turned on during observation, and the photographing light source 3 is turned on instantaneously during photography.

The light source image is once formed in the vicinity of another condenser lens 2b and the IJ tangent plate 6, and then is formed in the vicinity of the relay lens 7a.
, 7b, the image of the ring-shaped opening of the ring-shaped slit plate 6 is formed in the vicinity of the perforated mirror 8, where the illumination light is reflected and travels to the left. Then, using the objective lens 1o, the eye E to be examined is
After forming an image of the ring-shaped aperture near the crystalline lens E1, the fundus Ef is illuminated.

The reflected light from the fundus Ef travels to the right and is once formed into an image by the crystalline lens El and the objective lens 10, then passes through the perforated mirror 8 and the photographing aperture (not shown), and is focused by the focusing lens 12 and photographing lens group 13. It will be imaged. During observation, the fundus image is guided upward by the movable mirror 14 located at the solid line position and observed by the examiner's eye e through the finder 19. When taking a photograph, the movable mirror 14 rotates to the dotted line position and the fundus image is opened. The image is formed on a photographic film 16 via a shutter 15.

Now, as shown in FIG. 3, observation photographing mode' selection switches A and B are provided on the operation panel surface, and the examiner can select the observation photographing mode according to the subject. Switches A and B function as program selection switches.

That is, when switch A is selected, program A installed in advance is executed, and the exciter filter 5 and barrier filter 11 are automatically inserted into the optical path, allowing observation in the same state as in fluorescence fundus photography. At this time, observation light source 1
Set the brightness to increase automatically. When photographing with fluorescent light, the photographing switch S is pressed while the two filters are in the optical path, and the photograph is taken.

On the other hand, if switch B is selected, the pre-installed program B will be executed, and the exciter filter 5 and barrier filter 11 will be set outside the optical path, and the observation light source 1 that emits light at normal low brightness will not dazzle the subject. Alignment and focusing are possible without applying any force. During fluorescence photography, the two filters enter the optical path and when the photography switch S is pressed, fluorescence photography is performed. Incidentally, a mode in which only one of the exciter filter and the barrier filter is inserted into the optical path can be set as the observation string photography mode for observation photography.

As a means for automatically inserting and removing the filter into the optical path, in addition to a solenoid, an air-based drawer mechanism or other known means can be used. In addition, a plurality of observation photography modes may be initially set in the device as the aforementioned programs A and B, and a new observation photography mode different from programs A and B may be added later. It is possible. As described above, according to the present invention, it is possible to appropriately select a plurality of observation and photographing modes so that, for example, an eye patient or the like does not feel glare.

[Brief explanation of drawings]

Fig. 1 is a diagram showing wavelength light transmittance characteristics of exciter filters and barrier filters, Fig. 2 is a configuration diagram showing the optical system of an ophthalmological imaging device according to the present invention, and Fig. 3 is an observation shooting mode on the operation panel surface. In the figure, 1 is an observation light source, 3 is a photographing light source, 5 is an exciter filter, 11 is a barrier filter, 20° and 21 are solenoids, E is the subject's eye, and e is the examiner's eye.

Claims (1)

[Scope of Claims] An apparatus capable of fluorescent ophthalmology photography, comprising an operating means for inserting an exciter filter into an illumination optical path and a barrier filter into an imaging optical path, or removing it from the optical path, the operating means comprising: 1. An ophthalmological photographing apparatus characterized in that a plurality of operating states can be set and a selection means is provided for selecting a different operating state.