JPH032244Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention is designed to back-up the periphery of the slit-illuminated part of the subject's eye, which is slit-illuminated as the imaging target part of the subject's eye, both during observation and during imaging. This invention relates to an improvement of a lighting device for a photo slit lamp that enables ground lighting.

(Prior Art) Conventionally, lighting devices for photo slit lamps have been provided with peripheral illumination means for background illuminating the peripheral area of the slit illumination area that is slit-illuminated by the slit illumination means. It has been known. This peripheral illumination means receives part of the observation light from the observation light source as peripheral illumination light from one input end, and receives the photographic light from the photography light source as peripheral illumination light from the other input end. By using optical fibers in two branches that lead from one common exit end toward the peripheral area of the eye to be examined, the peripheral area of the slit-illuminated area is illuminated in the background during both observation and imaging. A part of the observation light used as peripheral illumination light is transmitted to a photography light source consisting of a strobe light source via a first light transmission section consisting of an optical fiber or the like, and is passed between filaments on opposite sides of the strobe light source. Then, the observation light is projected toward the subject's eye via a second light transmitting section made of an optical fiber, and when photographing, strobe light is projected toward the subject's eye via the second light transmitting section. There is a known method in which background illumination is applied to the periphery of the slit-illuminated area both during observation and during photographing.

However, the above-described method requires a bifurcated optical fiber, resulting in a problem of high manufacturing cost. In addition, in the above-mentioned method, since the observation light is guided by passing between the opposite electrode filaments of the strobe light source, vignetting of the observation light source is likely to occur due to the filament and the strobe tube, and to prevent this vignetting, the observation light If the luminous flux is narrowed down, the effective luminous flux used for illuminating the peripheral area is limited, and there is a problem in that it is difficult to effectively utilize the peripheral illumination light during observation. Furthermore, when a strobe tube becomes cloudy due to aging, there is also the problem that the amount of observation light passing through the strobe tube decreases. Furthermore, the above-mentioned device has the disadvantage that it is difficult to change the light amount ratio between the observation light and the photographing light used for ambient illumination.

(Purpose of the invention) The present invention was made in consideration of the above circumstances, and its purpose is to use an optical fiber whose light incident side is bifurcated, so that it can be used both during observation and during illumination. Illuminating the periphery of the eye to be examined eliminates the drawback that the manufacturing cost of photo slit lamps is extremely high, while also eliminating the possibility of vignetting a portion of the observation illumination light into the photographic light source during observation. It is an object of the present invention to provide an illumination device for a photo slit lamp that can be effectively used to illuminate the periphery of an eye to be examined.

(Structure of the invention) The photo slit lamp illumination device according to the invention is characterized by having a light source for observation and a light source for photographing, and a slit illuminating the eye to be examined by passing the light from both light sources through a first optical path. an illumination means, an optical fiber having one entrance end for illuminating the periphery of the eye to be examined using light from both light sources, and an optical fiber having an optical path different from the first optical path to be observed when observing the eye to be examined. a second optical path that guides the light from the imaging light source to the optical fiber without going through the imaging light source; an optical member that guides the light from the photographing light source to the optical fiber by superimposing it on the second optical path;
It is equipped with the following.

(Embodiments) Hereinafter, first to fifth embodiments of the lighting device for a photo slit lamp according to the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of an illumination device for a photo slit lamp according to the present invention. In this figure, 1 is a slit illumination means and 2 is an eye to be examined. This slit illumination means 1 functions to project slit light onto the eye 2 to be examined, and includes a strobe tube 3 as a light source for photographing and a lamp 4 as a light source for observation.
It has The strobe tube 3 and lamp 4 are arranged on the first optical path. A condenser lens 5 is provided between the lamp 4 and the strobe tube 3, and this condenser lens 5 has the function of focusing the light generated by the lamp 4 onto the emission center _O1 of the strobe tube 3. A condenser lens 6 is provided on the opposite side of the strobe tube 3 from the condenser lens 5. The focal point of this condenser lens 6 is aligned with the emission center _O1 of the strobe tube 3.

The light passing through the emission center _O1 of the strobe tube 3 is converted into a parallel beam by the condenser lens 6 and guided to the slit 7, and the light passing through the slit 7 is sent to the imaging lens 8 and the total reflection mirror as slit light. 9 onto the subject's eye 2. During photography, the strobe tube 3 emits light and the light is projected onto the subject's eye 2 as slit light, and during observation,
The lamp 4 is turned on and its light is projected onto the eye 2 as a slit light as if it were generated from the emission center _O1 of the strobe tube 3.

The illumination device of this photo slit lamp is provided with an illumination optical path means that guides peripheral illumination light toward the eye 2 to be examined, which illuminates the periphery of the slit-illuminated area in the background during slit illumination of the eye 2 to be examined. An optical fiber 10 is used here as the illumination light path means. This optical fiber 10 is provided independently of the slit illumination means 1. A condenser lens 1 is provided on the incident side of the optical fiber 10.
1 is provided, and a diaphragm 12 is provided on the exit side thereof.

The condenser lens 11 functions to condense peripheral illumination light from a peripheral illumination means to be described later and guide it to the input end 10a of the optical fiber 10, and the aperture 12 functions to condense peripheral illumination light from peripheral illumination means and guide it to the input end 10a of the optical fiber 10.
It functions to adjust the amount of ambient illumination light emitted from 0b. The peripheral illumination means includes a second optical path 13 that guides a portion of the observation light to the optical fiber 10 as peripheral illumination light without passing through the strobe tube 3 during observation, and a second optical path 13 that guides a portion of the photographing light as peripheral illumination light during photographing. A third optical path 14 leading to the optical fiber 10 is provided. The optical axis of the second optical path 13 and the optical axis of the third optical path 14 are configured to be orthogonal to each other.

The second optical path 13 is provided with a collimator lens 15 that condenses the light from the lamp 4 and converts it into a parallel beam, and a mirror 16 that totally reflects the parallel beam toward the condenser lens 11. The third optical path 14 is provided with a collimator lens 17 that condenses the light from the strobe tube 3 and converts it into a parallel beam of light. In the second optical path 13, a second
A semi-transparent mirror 18 as a common optical path means for making the optical path 13 and the third optical path 14 common.
is provided. This semi-transmissive mirror 18 is arranged obliquely with respect to the optical axis of the second optical path 13 and the optical axis of the third optical path 14, and transmits a part of the observation light toward the condenser lens 11 and transmits the photographing light. It functions to reflect a part of the light toward the condenser lens 11.

According to the first embodiment, when the lamp 4 is turned on during observation, a part of the light from the lamp 4 enters the slit 7 as if it were generated from the emission center _O1 of the strobe tube 3. Guided, that slit 7
The light passing through is guided to the eye 2 to be examined as slit illumination light via the imaging lens 8 and the total reflection mirror 9, and the eye 2 to be examined is slit-illuminated. At the same time, a part of the observation light is guided to the subject's eye 2 via the peripheral illumination means and the optical fiber 10, and the peripheral part of the slit illumination area is illuminated as a background. Next, when the strobe tube 3 is made to emit light during imaging, the flash of light from the strobe tube 3 is guided to the subject's eye 2 through the slit 7, and the slit-illuminated area is the same as the slit-illuminated area illuminated by the observation light during observation. The area is slit illuminated. At the same time, a part of the flash light is guided to the subject's eye 2 via the semi-transmissive mirror 18 and the optical fiber 10, and the periphery of the slit-illuminated area is background-illuminated.

FIG. 2 shows a second embodiment of the illumination device for a photo slit lamp according to the present invention, which aims to increase the amount of peripheral illumination light when the amount of peripheral illumination light from the strobe tube 3 is insufficient. In order _to
The light emitted from the strobe tube 3 is effectively utilized in accordance with the above, and the other configurations are the same as those of the first embodiment, so a description thereof will be omitted.

FIG. 3 is a diagram showing a third embodiment of the illumination device for a photo slit lamp according to the present invention, in which a half mirror 20 is used instead of the semi-transparent mirror 18 as a common optical path means, This half mirror 20 is evacuated from the second optical path 13 during observation and enters the second optical path 13 during photographing, and the other configurations are the same as in the first embodiment, so a description thereof will be omitted. do.

FIG. 4 is a diagram showing a fourth embodiment of the illumination device for a photo slit lamp according to the present invention, in which a rotating mirror is used instead of the semi-transparent mirror 18 as a common optical path means. Similarly to the half mirror 20 of the third embodiment, it is evacuated from the second optical path 13 during observation, and when photographed, it is removed from the second optical path 13.
The other configurations are the same as those of the first embodiment, so the explanation thereof will be omitted.

FIG. 5 shows a fifth embodiment of the lighting device for a photo slit lamp according to the present invention, in which the optical path common means is provided by a rotary plate 22 and mirrors 23 to 26 provided in the circumferential direction of the rotary plate 22. By changing the ratio of reflectance and transmittance of the mirrors 23 to 26 and rotating the rotary plate 22 around the axis 27, a desired mirror is selected and the second mirror is rotated.
The light path 13 of the slit is advanced into the optical path 13 so that the peripheral area of the slit illumination area can be appropriately illuminated both during observation and during photographing.Other configurations are the same as in the first embodiment.

Note that in the first to third embodiments as well, the semi-transparent mirror 18 or the half mirror 2
By adjusting the amount of zero intrusion, it is also possible to adjust the amount of illumination light in the surrounding area during observation and photography.

(Effects of the invention) By having the above-mentioned configuration, the illumination device for a photo-slit lamp according to the invention uses an optical fiber having a single incident end, which is inexpensive in terms of manufacturing, and also enables light emission from an observation light source. The light can be used as peripheral illumination light without vignetting caused by the photographic light source.

The light from the photographing light source can also be used as peripheral illumination light without eclipsing the observation light source.

Since the second optical path for illuminating the peripheral area during observation is superimposed on the third optical path for illuminating the peripheral area during imaging and guided to the optical fiber, the conditions are the same, and the illumination light from the observation light source and the imaging The ratio of the amount of illumination light from the light source can be clearly defined,
Furthermore, since the optical path from the light source can be taken in various ways, the degree of freedom in optical design increases, and it is easy to change the light quantity ratio as appropriate.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the optical system of the first embodiment of the illumination device for a photo slit lamp according to the present invention, and FIG. 2 is a diagram showing the optical system of the second embodiment of the illumination device for a photo slit lamp according to the present invention. 3 is a diagram showing a third embodiment of the photo slit lamp according to the present invention, FIG. 4 is a diagram showing a fourth embodiment of the photo slit lamp according to the present invention, and FIG. 5 is a diagram showing a fourth embodiment of the photo slit lamp according to the present invention. It is a figure which shows the 5th Example of the photo slit lamp based on this invention. 1... Slit illumination means, 2... Eye to be examined, 3...
... Strobe tube (light source for photography), 4 ... Lamp (light source for observation), 7 ... Slit, 10 ... Optical fiber (illumination optical path means), 11 ... Condenser lens, 13 ... Second optical path, 14...Third optical path, 18...Semi-transparent mirror (optical path common means), 20...Half mirror, 21...Swivel mirror,
22... rotating plate, 23-26... mirror.

Claims (1)

[Claims for Utility Model Registration] (1) A slit illumination means having a light source for observation and a light source for photographing, which illuminates the eye to be examined through a first optical path, and the periphery of the eye to be examined. an optical fiber having an input end for illuminating the section with light from both light sources;
a second optical path, which is different from the first optical path, and which guides the light from the observation light source to the optical fiber without going through the photographing light source when observing the eye to be examined; and photographing the eye to be examined. A third optical path different from the first optical path is used to illuminate the periphery of the subject's eye, which is sometimes slit-illuminated. An illumination device for a photo slit lamp, comprising: an optical member that leads to (2) The optical member transmits light from the observation light source in order to guide the light from the observation light source to the optical fiber via the second optical path, and
2. The illumination device for a photo-slit lamp according to claim 1, which is a semi-transparent mirror that reflects light from a photographing light source, and is provided obliquely in the second optical path. (3) The optical member is evacuated from the second optical path during observation in order to guide the light from the observation light source to the optical fiber via the second optical path, and is configured to conduct a third optical path during photography. a half-mirror that is extended into the second optical path to superimpose the light from the photographic light source guided through the second optical path, and guides the light from the photographic light source to the optical fiber by reflecting the light; An illumination device for a photo slit lamp according to claim 1, characterized in that the illumination device is provided obliquely in the optical path of the photo-slit lamp. (4) The optical member is a rotating mirror that can advance and retreat into the second optical path in order to guide the light from the observation light source to the optical fiber through the second optical path. An illumination device for a photo-slit lamp according to claim 1 of the utility model registration claim. (5) The second optical path is provided with a collimator lens that converts the light from the observation light source into a parallel beam, and a condenser lens that converges the parallel beam and guides it to the input end of the optical fiber, and Illumination of a photo slit lamp according to any one of claims 1 to 4 of the utility model registration claim, characterized in that the optical path is provided with a collimator lens that converts the light from the photographing light source into a parallel beam. Device. (6) The illumination device for a photo slit lamp according to any one of claims 1 to 5, wherein the optical member has a function of adjusting the light from both light sources guided to the optical fiber.