JPS5863912A - Illuminator for polarized bright and dark viewfield - Google Patents

Abstract

PURPOSE:To protect the eyes of a microcope examiner, by providing a shutter which works in response to the changeover of optical paths. CONSTITUTION:When a dark viewfield is illuminated, an optical path switch knob 10 is kept pushed. A shutter 13 touches a flipping shaft 16 adhered to an optical path switch frame 4 through the projected part 13a. Thus the shutter 13 is turned right around a shaft 14 fixed to the main body frame 1 and flipped outside the optical path. Here the knob 10 is pulled out slightly as shown in figure, and the shutter 13 turns left around the shaft 14 by its empty weight and according to a right shift of the shaft 16. Then the shutter 13 hits a stopper 15 and cuts off partially the optical path of illumination. The knob 10 is pulled further as shown in figure to switch the illumination to a bright viewfield. Thus the projected part 13b of the shutter 13 hits a flipping pawl 17 adhered to the frame 4 and then hits a flipping pawl 17 adhered to a main body frame 1. Thus the shutter 13 is turned right to be flipped outside the optical path.

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, a ring-shaped reflector for dark-field illumination and a semi-transparent mirror for bright-field illumination are integrally configured with each female dark-field illumination lens and bright-field illumination lens in the optical path. A so-called epi-illuminated bright-dark-field illumination device is known that allows easy switching between dark-field illumination and bright-field illumination by switching and inserting the illumination device. However, in this type of conventional equipment, when switching from dark field illumination to bright field illumination (
(or when switching from bright-field illumination to dark-field illumination), when the ring-shaped reflector for dark-field illumination moves slightly from the optical axis of the objective lens, the illumination light from the ring-shaped reflector does not become dark-field illumination. A portion of the light was not blocked by the light-shielding tube and directly reached the sample surface, where it was reflected and entered the field of view, resulting in extremely bright light. Although this is a temporary phenomenon when switching the optical path, switching the optical path during observation has the disadvantage of damaging the speculum's eyes.

Therefore, it is an object of the present invention to provide an epi-illuminated bright-dark field illumination device that can eliminate the above-mentioned drawbacks and protect the eyes of the speculum person by providing a shutter that operates in conjunction with the optical path switching operation. One embodiment of the invention will be explained with reference to FIGS. 1 and 2. FIG. 1 is a vertical sectional view of an optical path switching section of an embodiment of the apparatus according to the invention, and FIG. ■It is a line sectional view. 1 is a main body frame in which a mirror base mounting part is formed at the lower part and a lens barrel mounting frame 2 is integrally fixed at the upper part;
3 is a light-shielding tube fixed to the main body frame 1 to prevent dark-field illumination light from directly entering the objective lens; 4 is a dark-field illumination lens 5. A ring-shaped reflector 6 for dark-field illumination, a bright-field illumination lens 7, and a semi-transparent mirror 8 for bright-field illumination are attached, and the 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. 5) can be selectively configured. 11 is a light-shielding tube fixed to the ring-shaped reflecting mirror 6, and 12 is an illumination lens frame fixed to the main body frame 1, which supports an illumination lens (not shown). Reference numeral 13 denotes a shutter which is rotatably mounted on the main body frame 1 around a shaft 14 (see Figs. 36 to 5) and is used to block harmful light when switching the optical path. It is restricted by a stopper 15. Reference numeral 16 denotes an optical path switching frame 4 for abutting against the protrusion 13a of the shutter 13 and repelling the shutter 13 out of the optical path when the optical path switching frame 4 is in a position constituting a dark field illumination optical system (see FIG. 3). The fixed splash shaft 17 is the protrusion 1 of the shutter 13 when the optical path switching frame 4 is in the position constituting the bright field illumination optical system (see FIG. 5).
3b and is a repelling claw fixed to the optical path switching frame 4 for repelling the shutter 13 out of the optical path.

The operation of the device according to the present invention configured as described above will be explained in the third section.
This will be explained with reference to FIGS. 5 to 5. In the case of the dark-field illumination shown in FIG. 3, the optical path switching knob 10 is pushed in, and the shutter 13 has its protrusion 13a in contact with the splash shaft 16 fixed to the optical path switching frame 4, and the shutter 13 is moved to the main body frame. The light is rotated to the right around an axis 14 fixed at 1 and is rejected out of the optical path. When the optical path switching knob 10 is slightly pulled out (see FIG. 4), the shutter 13 rotates to the left around the shaft 14 due to its own weight as the splash shaft 16 moves to the right, and contacts the stopper 15, partially blocking the illumination optical path. to be shielded. Thus, the shutter 13 blocks harmful light that is directly reflected from the sample surface and enters the field of view. Furthermore, pull out the optical path switching knob 1o and switch to bright field illumination (see Figure 5).
The protruding portion 13b of the shutter 13 comes into contact with a repelling pawl 17 fixed to the optical path switching frame 4, is rotated to the right around a shaft 14 fixed to the main body frame 1, and is repelled out of the optical path. Therefore, when switching between dark-field illumination and bright-field illumination, the shutter 13 is pushed out of the optical path and has no effect on the optical path; however, during optical path switching, the shutter 13 blocks a part of the illumination optical path and is harmful. Prevents light from entering the field of view.

As described above, according to the present invention, since the shutter is operated in conjunction with the optical path switching operation using a simple configuration, harmful light at the time of optical path switching can be removed without requiring any special operation. Effective in protecting the speculum's eyes.

[Brief explanation of drawings]

Fig. 1 is a longitudinal 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. 3 is a 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. Figure 2 of the case m
-1 line sectional view, Fig. 4 is a sectional view similar to Fig. 3 with the optical path switching knob slightly pulled out from the state shown in Fig. 3, and the shutter is blocking a part of the illumination optical path. FIG. 4 is a cross-sectional view similar to FIG. 3 when switched to bright field illumination; 1... 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...Dovetail, 10...Optical path switching knob, 12...Illumination lens frame, 13...Shutter, 14... Axis, 15・
...Stopper, 16...Splashing shaft, 17...
...splashing claws. 'it figure Figure 2-8'l

Claims (1)

[Claims] In an epi-illuminated bright-dark-field illumination device for a microscope that performs epi-illuminated dark-field illumination and epi-illuminated dark-field illumination by switching a reflecting mirror and an illumination lens, the optical path switching frame is movably attached to the device body frame, and the optical path switching frame is fixed to the device body frame. a shutter mounted rotatably around a shaft and configured to be able to block a part of the illumination optical path; a repelling member that excludes the shutter from the illumination optical path when the shutter is moved; and a repellent member that is fixed to the optical path switching frame and expels the shutter from the illumination optical path when the optical path switching frame is moved to the bright field illumination position. 1. An epi-illuminated bright-field illumination device, characterized in that it is equipped with a separate forest cover member for excluding the light from the forest.