JPS5950417A - Dark field illumination device - Google Patents

Abstract

PURPOSE:To improve the use rate of a light source, by arranging an elliptic mirror between the light source and a collimator lens so that the light emitted from the light source is condensed at the front-side focus of the collimator lens. CONSTITUTION:One focus of an elliptic mirror 9 exists on a light source 1, and the other is a point (a), and a conjugate point a' of a plane mirror 10 is the front-side focus of a collimator lens 3. The light from the light source 1 is condensed to the point a' and becomes a parallel light by the collimator lens 3 and is condensed onto a sample 7 through a light shielding plate 5, a reflective mirror 4, and a condensing mirror 6. Consequently, all of the light striking the elliptic mirror 9 can be used to enhance the intensity of illumination; and since the light of the light source 1 does not strike the upper part of the elliptic mirror 9, the light emitted from the collimator lens 3 has the shape of a ring and the luminous flux intercepted by the light shielding plate 5 is slight, and the use rate of the luminous flux is improved in this respect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides brighter dark field illumination in microscopic imaging compared to conventional devices.

FIG. 1 shows an example of a conventional dark field illumination device for a microscope. In the figure, 1 is a light source, 2 is a concave mirror, 5 is a collimator lens, 4 is a reflecting mirror, 5 is a light shielding plate, 6 is a condensing mirror, 7 is a sample, and 8 is an objective lens.

The light source 1 is located at the front focal point 2b of the correlator lens 3. The concave mirror 2 is a spherical mirror whose center is at the light source 1. A part of the light emitted from the light source 1 directly enters the collimator lens 5, and another part enters the collimator lens 3 after being reflected by the concave mirror 2. The luminous flux becomes parallel rays by the collimator lens B. The light beam becomes ring-shaped due to the light shielding plate 5.

Reflector 4 is a plane mirror with a hole in the center.
A ring-shaped parallel light mirror is passed through the rotation of the objective lens 8, and the light beam is guided to a focusing mirror B.

The parallel light beam υ is focused on the sample 7 by the focusing mirror B,
Dark field illumination is performed.

In this method, out of the light emitted from the light source 1, the lens 3
, and only the light hitting the mirror 2 was used, so the light utilization rate was poor and sufficient illuminance could not be obtained.

An object of the present invention is to provide a dark field illumination device with high utilization of light sources.

The present invention uses an elliptical mirror and uses all the luminous flux in the circumferential direction of the light source, thereby realizing brighter dark-field illumination than in the past.

An embodiment of the present invention will be described below with reference to FIG. 9 in the figure is an elliptical mirror, one of its focal points is the light source, and the other is,
It is 0 points. In the figure, 10 is a plane mirror whose conjugate point is .
It is. The point is also the front fish collection position of the collimator lens 6. The light emitted from the light source 1 is focused at a point of 1 degree, and then enters a collimator lens 5, where it is made into parallel light beams, and is focused onto a sample 8 by a light shielding plate 5, a reflecting mirror 4, and a condensing mirror 6. According to this embodiment, out of the light emitted from the light source 1,
Since almost all of the light falling on the elliptical mirror 10 can be utilized, compared to the first conventional method, the utilized luminous flux is significantly increased and the intensity of the illumination is significantly increased. Further, according to this embodiment, since no useless light having the shape of the light source 1 is present above the elliptical mirror 9, the light emitted from the collimator lens 6 becomes ring-shaped, and only a small amount of light is blocked by the light-shielding plate 5. Even at points, the utilization rate of luminous flux is high.

In this embodiment, a mercury lamp is considered as the light source, but any light source may be used as long as it is close to a point light source. Further, 9 in the figure is most preferably an elliptical mirror, but it does not need to be an elliptical mirror as long as it is small enough to be close to the collimator lens 3 and can condense light to a zero point. Also,
The reflector 10 is necessary only when the lamp, such as a mercury lamp, must be used in an upright position.If the lamp can be placed horizontally, the reflector 11 is not necessary and the light from the light source 1 is directly focused on six points. All you have to do is change the arrangement of the elliptical mirror 9 so that it emits light.

Furthermore, although in this embodiment the light is collected onto the sample using the condensing mirror 6, it may also be condensed using a lens.

According to the present invention, the utilization rate of the luminous flux of the light source is improved and bright dark-field illumination can be obtained.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional dark field illumination device, and Fig. 2 is an explanatory diagram of a conventional dark field illumination device.
FIG. 1 is an explanatory diagram of a dark field illumination device according to an embodiment of the present invention. 1. Light source 2. Concave mirror 3. Collimator lens 4. Reflector 5... Light shielding plate
6...Collecting mirror 7...Sample 8
...Objective lens? ... Ellipse mirror 10.
...plane mirror 1″1 is the second

Claims (1)

[Claims] 1 In a dark field illumination device consisting of a light beam, a collimator lens, a light shielding plate, a reflector, and a condensing mirror or condensing lens, an elliptical mirror is placed between the light source and the collimator lens, and the light emitted from the light source is collimated. A dark-field illumination device characterized by being arranged so as to condense light at a focal point on the front side of a lens.