JPH04334Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to an illumination optical device having a strobe for photography.

(Background of the invention) In an illumination device that has an illumination system consisting of a light source lamp, a collector lens, a condenser lens, etc. and a strobe device for photography, an image of the light source lamp is formed on a strobe light emitting tube by a relay lens, Generally, the light source lamp has the same effect as a strobe tube. With this configuration, normal observation can be performed using the light beam from the light source lamp, and photography can be performed using the light beam from the strobe, and each illumination state can be used appropriately.

By the way, in optical equipment having the above-mentioned illumination device, such as a microscope, a tungsten bulb or a halogen lamp is often used as a light source lamp, and since these light sources generally have a low color temperature, some kind of color temperature correction is required. It is. On the other hand, the color temperature of the light from a strobe light bulb used for photography is relatively high, and natural coloring can be obtained even when used as is for photography. For this reason, conventionally, when observing and focusing on a specimen using a lamp light source, a color temperature correction filter is inserted into the optical path, and when a strobe tube is used to emit light for photography, a color temperature correction filter is inserted into the optical path. The filter was removed from the optical path, resulting in a complex configuration and complicated operation.

(Purpose of the invention) The purpose of the invention is to eliminate the above-mentioned drawbacks, to make it possible to use a light source lamp and a strobe device as appropriate, and to enable both naked eye observation using a lamp light source and photography using a strobe tube. With a simple configuration, it is possible to provide illumination with the optimal color temperature for both visual observation and photography without the need to insert or remove any color temperature correction filters, thereby increasing the illumination efficiency of strobe devices. The purpose of the present invention is to provide an optical device.

(Summary of the invention) The illumination optical device according to the invention includes a light source lamp,
An illumination optical device including a relay lens for forming an image of the light source lamp, a strobe device disposed at an image position of the light source lamp, and a collector lens for condensing a light flux from the strobe device, wherein the light source A color temperature correction filter is provided between the lamp and the strobe device, and a parallel plane plate having a semi-transparent surface is provided between the color temperature correction filter and the strobe device.

(Embodiments) The present invention will be described below based on illustrated embodiments. FIG. 1 is a diagram showing the configuration of an embodiment of an illumination optical device according to the present invention. A light beam from a light source lamp 1 is focused onto a strobe tube 3 by a relay lens 2, and then guided to a test object (not shown) by a collector lens 4. The relay lens 2 is composed of two positive lens groups 2a and 2b.The light source side focal point of the positive lens group 2a on the light source 1 side coincides with the light source 1, and the positive lens group 2b on the strobe tube 3 side coincides with the light source side focal point. The focal point on the strobe tube side coincides with this strobe tube 3. Therefore, the light beam from the light source 1 becomes a parallel light beam between the two positive lens groups of the relay lens 2. A color temperature correction filter 5 is placed in this parallel light beam, and a matte surface 6a is placed on the side of the light source 1.
A parallel plane plate 6 having a semi-transparent surface 6b on a surface facing the strobe tube 3 is disposed.

With such a configuration, the illumination light flux from the light source 1 has its color temperature corrected by the color temperature correction filter 5 and is focused onto the strobe tube 3. A matte surface 6 is formed on the light source side surface of the parallel plane plate 6.
Since the light beam from the light source 1 is diffused by a, the image of the light source 1 is evenly and uniformly focused onto the strobe tube 3. The light beam from the light source 1 thus focused on the strobe tube 3 enters a collector lens 4 and is supplied to a test object (not shown). Next,
When taking a photograph, the strobe tube 3 is turned on to emit light. Among the light fluxes from the strobe tube 3, the light flux directly incident on the collector lens 4 is supplied to the object to be examined in the same way as the light flux from the light source 1, while the light flux from the strobe tube 3 toward the relay lens 2 is directly incident on the collector lens 4. The light is reflected at a predetermined reflectance by the semi-transparent surface 6b of the parallel plane plate 6 provided therein, and is again focused onto the strobe tube. Therefore, out of the luminous flux from the strobe tube 3, the luminous flux directed toward the light source 1 can also be used as illumination light for photography, making it possible to provide extremely bright illumination. here,
Since the color temperature correction filter 5 is provided closer to the light source 1 than the semi-transparent surface 6b, the color temperature correction filter Since the color temperature correction filter 5 does not have any influence on the light flux from the strobe tube, the color temperature correction filter 5 does not have any adverse effect on the luminous flux from the strobe tube.

Therefore, the filter 5 can remain placed in the optical path for color temperature correction both during naked eye observation and when taking photographs, and there is no need to remove it from the optical path, resulting in a simple configuration and no troublesome operation. . Furthermore, in the above configuration, it is possible to increase the efficiency of illumination by the strobe tube without affecting color temperature correction in any way. And, since a matte surface is provided between the light source and the semi-transparent surface,
It is possible to prevent the image of the light source from causing uneven illumination due to non-uniformity of the glass surface surrounding the light source, and is effective in more uniformly illuminating the object to be inspected. The position of this matte surface is set at a position closer to the light source than the semi-transparent surface so that the semi-transparent surface does not reduce the efficiency of guiding the light flux from the strobe tube toward the light source to the test object. The positional relationship with the color temperature correction filter is arbitrary.

FIG. 2 is a schematic configuration diagram showing an example in which the illumination device of the above embodiment is used in an illumination optical system for a microscope.
In FIG. 2, members having the same functions as those shown in FIG. 1 are given the same reference numbers. The light beam from the light source 1 is focused onto the strobe tube 3 by the relay lens 2, then enters the collector lens 4, is reflected by the optical path bending reflector 6, and is focused onto the focal position of the condenser lens 7. . A condenser 7 supplies this light flux as a parallel light flux to an object plane 8 to perform so-called Koehler illumination. Then, an object image 10 on the object plane 8 is enlarged and formed at a predetermined position by the objective lens 9. On the other hand, when taking a photograph, the strobe tube 3 emits light. Among the light fluxes from the strobe tube 3, the light fluxes directed toward the relay lens 2 are reflected by the semi-transparent surface 6b and condensed onto the strobe tube. It is possible to provide very bright illumination for photography by supplying the light to the object plane.

In the above embodiment, the semi-transparent surface provided in the relay lens was made into a flat surface, but this is because the position of the semi-transparent surface is in the parallel light beam and the wavefront here is a flat surface. It goes without saying that when a semi-transparent surface is provided in a light beam or a diverging light beam, it should be a spherical semi-transparent surface. In this case, it is necessary to match the curvature of the semi-transparent surface to the curvature of the wavefront at that position, so that the light beam from the strobe is focused on the strobe again and an image is formed at the same magnification. Therefore, it becomes possible to efficiently collect the light reflected by the semi-transparent surface.

Furthermore, in the above embodiment, the color temperature correction filter is provided separately from the parallel plane plate having the matte surface and the semi-transparent surface, but the color temperature compensation filter may be provided with the matte surface and the semi-transparent surface. , it is also possible to configure these in one piece. Furthermore, it is also possible to provide the three surfaces, the color temperature correction filter surface, the matte surface, and the semi-transparent surface, by forming them on separate members.

(Effects of the invention) As described above, according to the invention, the light source lamp and the strobe device can be used appropriately, and the color temperature can be corrected for both naked eye observation using the lamp light source and photography using the strobe tube. With a simple configuration, it is possible to provide illumination with the optimal color temperature for both visual observation and photography without the need to insert or remove any filters. Moreover, in the above configuration, it is possible to increase the efficiency of illumination by the strobe device without affecting color temperature correction.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of an illumination device according to the present invention, and FIG. 2 is a schematic configuration diagram showing an example in which the embodiment shown in FIG. 1 is applied to an illumination system of a microscope. Explanation of symbols of main parts, 1... Observation light source lamp, 2... Relay lens, 3... Strobe, 5...
...Color temperature correction filter, 4...Corrector lens.

Claims (1)

[Scope of utility model registration request] An illumination optical device including a light source lamp, a relay lens for forming an image of the light source lamp, a strobe device disposed at an image position of the light source lamp, and a collector lens for condensing a light beam from the strobe device. An illumination device characterized in that a color temperature correction filter is provided between the light source lamp and the strobe device, and a parallel plane plate having a semi-transparent surface is provided between the color temperature correction filter and the strobe device. optical equipment.