JPH0530722Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an illumination device for a narrow-lamp microscope.

[Conventional technology]

A narrow-lamp microscope is configured to optically section a subject using slit illumination light to observe or photograph the slit-illuminated area, and has been put into practical use as a microscope device for observing eye diseases. In this narrow-lamp microscope, in order to determine the position of the slit illumination part projected onto the subject, it is necessary to illuminate the background part in addition to the slit illumination light. equipment is used. Such a slit illumination device is known and is disclosed, for example, in Japanese Utility Model Publication No. 59-43526.

FIG. 6 is a diagram showing the configuration of a slit illumination device used in a known narrow-lamp microscope. An observation illumination light source 1, a condenser lens 2, a discharge tube 3 for photographing, a condenser lens 4, a slit 5, and a projection lens 6 are arranged in a position optically conjugate with the observation illumination light source 1 toward the eye to be examined. Further, a condenser lens 8 and one end of a light guide 9 are arranged on the opposite side of the observation illumination light source 1 from the eye 7 to be examined. During observation, illumination light emitted from the observation illumination light source 1 in the direction of the eye 7 to be examined passes through the condenser lens 2, the discharge tube 3, the condenser lens 4, the slit 5, and the projection lens 6, and forms an image on the eye 7 to be examined, forming a slit image. The illumination light emitted in a direction opposite to the direction of the eye to be examined passes through the condenser lens 8 and the light guide 9 and illuminates the entire eye 7 to be examined from the other end of the light guide 9, thereby performing both slit illumination and background illumination. There is. In addition, during photography, the photographing illumination light emitted from the discharge tube 3 toward the eye to be examined passes through the condenser lens 4, the slit 5, and the projection lens 6, and forms a slit image on the eye 7 to be examined in the opposite direction from the eye to be examined. The illumination light emitted from the eye passes through the condenser lens 2, the observation illumination light source 1, the condenser lens 8, and the light guide 9, and illuminates the entire eye to be examined.

Furthermore, Japanese Utility Model Application Publication No. 54-183197 discloses another illumination device for a narrow light microscope,
FIG. 7 is a diagram showing the configuration of the known lighting device. In this known illumination device, an observation illumination light source 1
and a light guide 10 near the photography illumination light source 3.
and 11 are arranged, and these light guides 10 and 11 are combined into one light guide, and the other end is arranged near the eye to be examined to illuminate the entire eye to be examined to perform slit illumination and background illumination. It is configured as follows.

[Problem that the invention attempts to solve]

The illumination device for a narrow-light microscope described in the above-mentioned Japanese Utility Model Publication No. 59-43526 has a configuration in which a condenser lens and a light guide are separately arranged on the opposite side of the observation illumination light source from the eye to be examined in order to provide background illumination. This has the disadvantage that the lighting device becomes larger in the optical axis direction. In addition, the illumination light source for observation and the discharge tube for photography have an optically conjugate relationship, but in reality, the illumination light for background illumination emitted from the discharge tube in the direction of the light guide is the illumination light source for observation. As the amount of light is reduced by the filament, the ratio of the amount of light between the slit illumination area on the subject and the background illumination area differs between observation and photography, making it difficult to take photographs. .

In addition, in the illumination device described in Japanese Utility Model Application Publication No. 54-183197, one end of each light guide for propagating background illumination light is individually placed near the observation illumination light source and the photography illumination light source for observation. Because the background illumination for photography and the background illumination for photography are performed separately, the relationships between the two end faces of these light guides and each light source do not necessarily match, and the amount of light between the slit illumination section and the background illumination section is also different. This had the disadvantage that the ratio was different between observation and photography, making photography difficult. The inability to take clear photographs due to these differences in illumination conditions has a serious negative impact on accurate diagnosis and treatment. Furthermore, a configuration in which one end of the light guide is simply disposed near the light source has the disadvantage that the luminous flux emitted from the light source cannot be effectively utilized, resulting in insufficient background illumination light. Although a method of arranging a condenser lens may be considered to solve this drawback, the number of parts increases, the structure becomes complicated, and the manufacturing cost becomes high.

Therefore, the purpose of the present invention is to solve the above-mentioned drawbacks, to achieve a simple structure and miniaturization, and to make the illumination conditions during observation and photography the same. To provide a slit illumination device that can take clear photographs.

[Means and actions for solving problems]

The illumination device for a narrow light microscope according to the present invention includes a light source device for illumination that emits a luminous flux, a slit plate having a slit arranged in the optical path of the luminous flux, and a luminous flux that passes through the slit of the slit plate and emits the luminous flux onto a subject. The present invention is characterized by comprising a projection lens for projecting images, and a means for extracting a light beam incident on a portion of the slit plate that does not contribute to slit illumination and projecting it onto a subject.

In this way, by extracting the light flux that does not contribute to slit illumination from the light flux incident on the slit plate and projecting it onto the subject, the light flux emitted from the light source can be used effectively, and the device can be made more compact. , the illumination conditions during observation and photography can be made the same.

〔Example〕

FIG. 1 is a diagram showing the configuration of an example of a slit illumination device according to the present invention. The illumination light emitted from the observation illumination light source 20 is transmitted through the first condenser lens 21
The light is collected and enters a discharge tube 22 for photographing.
The discharge tube 22 for photography is configured with, for example, a xenon lamp, and includes an illumination light source 20 for observation.
placed at a position optically conjugate with. The illumination light for observation and the illumination light for photography are provided by the second condenser lens 2.
3, the light enters a slit plate 24 in which a slit opening 24a extending in a direction perpendicular to the plane of the paper is formed. This slit plate 24 is connected to each light source 20 and 22.
A reflective surface 24b is formed on the surface facing the
The slit is arranged at an angle with respect to the optical axis to the extent that the projected image is not blurred. The illumination light for observation and photographing that has passed through the slit opening 24a of the slit plate 24 is imaged by the projection lens 25 onto the subject's eye 26, which is the subject, to form a slit image. On the other hand, the illumination light for observation and projection that has entered the reflective surface 24b of the slit plate 24 is reflected by the reflective surface 24b and travels out of the optical path due to the inclination of the slit plate 24, and reaches one end 27a of the light guide 27. incident,
The light propagates through the light guide 27 and exits from the other end 27b, passes through the light amount adjustment aperture 28, and then passes through the eye to be examined 26.
illuminate over a wide area. With this configuration, the slit illumination light and background illumination light emitted from the observation illumination light source 20 and the slit illumination light and background illumination light emitted from the discharge tube 22 enter the subject's eye 26 through the same optical path. So. The illumination conditions during observation and photography are the same, that is, the light intensity ratio between the slit illumination light and background illumination light during observation is equal to the light intensity ratio during photography. You can take clear photos. In addition, by simply tilting the slit plate 24 with respect to the optical axis, it is possible to divide and extract illumination light that does not contribute to slit illumination, making it possible to use the illumination light effectively and downsizing the device. can.

FIGS. 2A and 2B are diagrams showing the structure of a modified example of the slit plate. In this example, a slit plate 30 having a wedge-shaped cross section and having a slit opening 30a extending in the direction of the plane of the paper is used as the slit plate, and the surface 30b on the side facing the subject's eye is perpendicular to the optical axis and faces the light source. The surface is a reflective surface 30c and a surface inclined with respect to the optical axis. If such a slit plate is used, the luminous flux that does not contribute to slit illumination can be divided and extracted without blurring the slit image, increasing the degree of freedom in construction. Figure 2B
shows an example in which a condenser lens 31 is arranged between a slit plate 30 and a light guide 27. If a condenser lens 31 is placed between the slit plate 30 and the light guide 27, the illumination light reflected by the slit plate 30 will be condensed.
The effective angle of incidence of the light increases, and the amount of light for background illumination increases.

FIG. 3 is a diagram showing the configuration of a modified example of the slit illumination device according to the present invention. The same members as those used in FIG. 1 will be described with the same reference numerals. This example shows an example in which background illumination light is propagated using two reflecting mirrors instead of a light guide. The light flux reflected by the slit plate 30 is made incident on the first reflecting mirror 40, and the reflected light is made incident on the second reflecting mirror 41 whose reflective surface is roughened, and the reflected light is applied to a wide range of the eye 26 to be examined. Background illumination is performed by making the light incident across the whole area.
In this way, by making the reflecting surface 41a of the second reflecting mirror 41 a rough surface, uneven illumination can be removed with a simple configuration, and uniform background illumination can be achieved.
Note that an optical system for condensing or diffusing the divided light beams may be placed in the optical path.

4A and 4B show the configuration of another modified example of the slit illumination device according to the present invention, FIG. 4A is a diagram showing the overall configuration, and FIG. It is a cut sectional view. In this example, the slit plate 50 is not used as a reflective surface, and is arranged perpendicular to the optical axis. Two apertures 50b and 50c are provided on both sides of the slit aperture 50a on the surface of the reflection plate 50 where light beams that do not contribute to slit illumination enter, and one end 5 of the light guide 51 is provided in these apertures 50b and 50c.
1a and 51b are attached to allow a light beam that does not contribute to slit illumination to enter, propagate within the light guide 51, pass through a light amount adjustment diaphragm 28, and enter over a wide range of the eye 26 to perform background illumination.
This configuration is advantageous when there is no structural space on the light source side of the slit plate 50.

5A and 5B show the configuration of yet another modification of the slit illumination device according to the present invention,
FIG. 5A is a diagram showing the configuration of a portion from which background illumination light is taken out, and FIG. 5B is a perspective view. In this example, apertures 60b and 60c are formed on both sides of the slit opening 60a of the slit plate 60 at the portions where light beams that do not contribute to slit illumination are incident, and reflecting mirrors 61a and 61 are formed behind these apertures 60b and 60c.
b are arranged respectively, and the light beams that do not contribute to slit illumination are reflected by these reflecting mirrors 61a and 61b and incident on one ends 62a and 62b of the light guide 62, respectively. This configuration is also advantageous when there is no space on the light source side of the slit plate.

The present invention is not limited to the embodiments described above, but can be modified in various ways. For example, in the above embodiments, the naked eye was used as the observation sample, but the present invention can also be applied to observations such as measuring irregularities on semiconductor surfaces.

[Effect of idea]

As explained above, according to the present invention, out of the luminous flux that is incident on the slit plate for forming the slit illumination light, the luminous flux that does not contribute to the slit illumination is branched and used as background illumination light, so that it is emitted from the light source. This makes it possible to effectively utilize the luminous flux generated and to downsize the device.

In addition, since the illumination light during observation and the illumination light during photography are configured to enter the subject through the same optical path, the illumination conditions for observation and photography can be the same, and therefore the illumination light for the subject can be photographed clearly.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an example of the slit illumination device according to the present invention, FIGS. 2 A and B are diagrams showing the configuration of a modified example of the slit plate, and FIGS. 3 to 5 are diagrams showing the configuration of a modified example of the slit plate. FIGS. 6 and 7 are diagrams showing the configuration of a modified example of the illumination device, and FIGS. 6 and 7 are diagrams showing the configuration of a conventional slit illumination device. 20... Observation illumination light source, 21, 23, 31...
...Condenser lens, 22...Discharge tube, 24,3
0,50,60...Slit plate, 25...Projection lens, 26...Eye to be examined, 27,51,62...Light guide, 28...Light amount adjustment diaphragm, 40,41
……Reflector.

Claims (1)

[Claims for Utility Model Registration] 1. A light source device for illumination that emits a luminous flux, a slit plate having a slit arranged in the optical path of the luminous flux, and a projection that projects the luminous flux that has passed through the slit of the slit plate onto a subject. 1. An illumination device for a narrow-lamp microscope, comprising a lens and means for extracting a luminous flux incident on a portion of the slit plate that does not contribute to slit illumination and projecting it onto a subject. 2. The incident side surface of the slit plate is made a reflective surface, and this reflective surface is tilted with respect to the optical axis,
An illumination device for a narrow-lamp microscope according to claim 1, characterized in that the illumination device is configured to project the reflected light from the reflective surface onto a subject.