JPS5818613A - Slanting light and dark visual field luminaire - Google Patents

Abstract

PURPOSE:To protect the eyes of a person in charge of examination and to improve the efficiency of the observation while eliminating the adjustment of brightness during switching, by automatically inserting a dimming member into an optical path of lighting in cooperation with switching from dark visual field to light visual field lighting. CONSTITUTION:During dark visual field lighting, an optical path changeover knob 10 is pressed in and a filter frame 12 abuts on a stopper 15 to be inserted in an optical path of light visual field lighting. Then when the knob 10 is drawn out to perform switching to light visual field lighting, the frame 12 while inserted into the optical path of light visual field lighting constitutes and an optical system for the light visual field lighting and an ND filter 14 is inserted into the optical path automatically, so that the difference in brightness during the switching from the dark visual field lighting to the light visual field lighting is reduced automatically in cooperation with the switching of lighting. If lighting brighter than the light visual field lighting is required, an arm 17a is operated to rotate a spring-away ring 17 against the tensile force of a spring 18, and a projection 12a formed on the frame 12 is pressed by a pawl 17b to rotate the frame 12, which is sprung out of the optical path of the light visual field lighting.

Description

[Detailed description of the invention] The present invention relates to an epi-illuminated bright-field illumination device for a microscope.

Conventionally, as an epi-illuminated dark-field illumination device for a microscope, there is a so-called epi-illuminated bright-dark field illumination device in which a ring-shaped reflector for dark-field illumination and a semi-transparent mirror for bright-field illumination can be used as a dark-field illumination lens and a bright-field illumination lens, respectively. Are known. However, in this type of conventional apparatus, there is a large difference in the brightness of the observation field when switching from dark-field illumination to bright-field illumination, and this brightness changes particularly when the sample is close to a mirror surface with high reflectance. The difference is so large that it can damage the eye of the speculum.
Further, there were other problems such as having to adjust the brightness of the observation field every time the switch was made.

For this reason, a light intensity adjustment filter is removably disposed in the bright field illumination optical path (Japanese Patent Laid-Open No. 103362/1983).
However, this required the filter to be attached and detached when changing the lighting, which was cumbersome to operate. Ma'fctf#
There is a model, such as No. 52-40149, in which a filter 2 is inserted into the bright field illumination optical path in conjunction with switching the illumination, but the filter is inserted even when brighter illumination is required for photography etc. There was a drawback that

Therefore, the present invention makes it possible to automatically insert a light reduction member such as an ND filter into the illumination optical path when switching to bright field illumination in conjunction with the illumination switching operation, and when even brighter illumination is required. By repelling the light attenuation member out of the illumination optical path, the above-mentioned problem can be removed, that is, the difference in brightness due to illumination switching can be reduced with simple and quick operation, and the epi-illumination brightness can protect the eyes of the speculum examiner. An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1U is a vertical cross-sectional view of the optical path switching section of an embodiment of the device according to the present invention. FIG. 2 is a top view, and FIG. 2 is centered on the cross section taken along the line ■-■ in FIG. Reference numeral 1 denotes a main body frame in which a mirror base mounting part is formed at the bottom and a lens barrel mounting frame 2 is integrally fixed to the upper part. Reference numeral 3 indicates a main body frame to prevent dark-field illumination light from directly entering the objective lens. Fixed to the frame 1 is a fc light tube, 4 is a dark field illumination lens 5. A ring-shaped reflector 6 for dark-field illumination and a bright-field illumination lens 7° A semi-transparent mirror 8 for bright-field illumination is attached, and a dovetail groove formed in the lens barrel mounting frame 2 is perpendicular to the plane of the paper in FIG. It is an optical path switching frame to which a dovetail 9 is attached that engages so as to be able to slide in a certain direction, and when the optical path switching knob 10 is operated, the dark-field illumination optical system (see FIG. 3) and the bright-field illumination optical system (see FIG. 3) are switched. (see FIG. 4) can be selectively configured. 11 is a light-shielding tube fixed to the ring-shaped reflector 6; 12 is pivotally attached to the optical path switching frame 4 so as to be rotatable around a shaft 13 (see FIGS. 3 to 5); and is provided with an ND filter 14. Rotation of the filter frame is restricted on one side by a stopper 15. Reference numeral 16 denotes an illumination lens frame fixed to the main body frame 1, which supports an illumination lens (not shown), and which is secured by a wire ring in a recessed part inside the frame and rotatably disposed. It has a repelling ring 17 for repelling the filter out of the optical path. The splash ring 17 has an arm 17a that passes through a slot provided in the illumination lens frame 16 and projects outward, and a claw 17b that projects inside the main body frame 1.
7a and the position of the claw 17b, in the case of bright field illumination, the position of the claw 17b is
The protrusion 12a of the filter frame 12 facing into the movement path operates the arm 17a to move the splash ring 17 in the direction of arrow A in FIG.
When the filter frame 12 is rotated counterclockwise VC when viewed in the direction shown in FIG. 18 is a claw 17 whose one end is a repellent ring 17
b, the other end of which is fixed to the main body frame 1, gives the splash ring 17 dextrorotation when viewed from the direction of arrow A in FIG.

The operation of the device according to the present invention configured as described above will be explained in the third section.
f) will be explained with reference to FIGS. In the case of dark-field illumination shown in FIG. 3, the optical path switching knob 10 is pushed in and the filter frame 12 is turned off! -15 and is inserted into the bright field illumination optical path. Here, when the optical path switching knob 10 is pulled out to switch to bright field illumination, the bright field illumination optical system is configured with the filter frame 12 inserted into the bright field illumination optical path, so it is as easy as pulling out the optical path switching knob 10. The ND filter 14 is automatically inserted into the optical path whenever switching to bright field illumination through an operation, and the difference in brightness when switching from dark field illumination to bright field illumination is linked to the illumination switch. (see Figure 4). Further, when bright field illumination requires brighter illumination for photography or the like, it is necessary to arbitrarily remove the ND filter 14 from the bright field illumination optical path. To do this, operate the arm 17at to rotate the splash ring 17 against the tension of the nose 18, push the protrusion f' formed on the filter frame 12 with the claw 17b, and push the projection 12alr on the filter frame 12. 12 to remove it from the bright field illumination optical path (see Figure 5).
. When switching to dark field illumination by pushing in the optical path switching knob 10 from this state, as the optical path switching knob 10 is pushed in, the filter side frame 12 is continuously rotated to the left while contacting the side wall of the main body frame 1, thereby illuminating bright field illumination. It is inserted into the optical path and returns to the state shown in FIG. In this case, if the mold 17b remains in the rejected position, it will get caught on the protrusion 12a of the filter frame 12 when switching from bright-field illumination to dark-field illumination, and the filter frame will become stuck when switching from dark-field illumination to bright-field illumination. 1
2 from the bright field illumination optical path. Therefore, when the arm 17a is released, the spring 18 causes the deflection ring 17 to rotate to the right, so that the claw 17b returns to its initial position. If the optical path switching knob 10 is pushed in from the state shown in FIG. 4, the filter frame 12 remains inserted into the bright-field illumination optical path and does not rotate, and is switched to the state shown in FIG. 3, that is, the dark-field illumination state. nru.

In the above embodiment, an ND filter is used, but other light attenuation members such as a diffuser plate may be used. The splash ring may also be constituted by other splash mechanisms, such as a plunger with a return spring.

Friend, the filter frame can be inserted into and removed from the optical path in a rotational manner, but the filter frame may be provided in the optical path switching frame, but it may also be constructed so that it can be inserted into and removed from the optical path in a sliding manner on the idle rail. .

As described above, according to the present invention, when switching from dark field illumination to bright field illumination, a light attenuation member such as an ND filter is automatically inserted into the illumination optical path in conjunction with the illumination switching operation. This is very effective in reducing differences in brightness caused by switching illumination, protecting the speculum operator, and eliminating the need to adjust brightness when switching, improving observation efficiency.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the optical path switching section of an embodiment of the epi-illuminated bright-field illumination device according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. 2nd case of nfc
Fig. 4 is a sectional view similar to Fig. 3 when switched to bright field illumination, Fig. 5 is a cross sectional view taken along the line shown in Fig. It is a similar sectional view. ■...Body frame, 2... Lens barrel mounting frame, 3.11...
Light-shielding tube, 4... Optical path switching frame, 5... Dark-field illumination lens, 6... Ring-shaped reflector, 7... Bright-field illumination lens, 8... Semi-transparent mirror, 9... Ant , 10... Optical path switching knob, 12... Filter frame, 12a... Protrusion, 13... Shaft, 14... ND filter, 15...
・Stotsuno"-116...Lighting lens frame, 17...Splash ring, 17a...Arm, 17b...Claw,
18...Spring. :. Agent Patent Attorney Yasushi Shinohara: 4゛5! p1 illustration spear 2 figure

Claims (1)

[Claims] In an epi-illuminated bright-field illumination device for a microscope that performs epi-illuminated dark-field illumination and epi-illuminated bright-field illumination by switching the reflector and illumination lens, there is an optical path switching frame that is movably attached to the frame of the device body, and an optical path switching frame that is movable to the optical path switching frame. a light attenuation member attached to the light path switching frame and arranged to be automatically inserted into the bright field illumination optical path when the light path switching frame is moved to the bright field illumination position; An epi-illuminated bright-field illumination device comprising: a repelling mechanism capable of removing the light attenuation member from the bright-field illumination optical path when the light-reducing member is moved to the illumination position f'.