JPH04257818A - Double type light converging guide - Google Patents

Abstract

PURPOSE:To positively utilize downward light by combining a light converging means which is so shaped as to obtain the downward light with a light converging means which obtain sideward light. CONSTITUTION:The illumination light from a light source 5 which is made incident on the incidence surface of the rear part 10r of the light converging means 10 and guided inside by total reflection is projected laterally from the irradiation surface 14 of the inner periphery of a through hole 11 and the light converging means 10 obtains sideward light. Then the light converging means 20 has an irradiation surface 22 at its front part 20q facedown to the periphery of a through hole 21 and is so shaped as to have a curved surface part connecting gently with the irradiation surface 22. Namely, the illumination light which is made incident on the incidence surface of the rear part 20r and guide inside by total reflection is projected downward from the irradiation surface 22 to obtain downward light.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensing guide used in a magnifying observation device.

0002

2. Description of the Related Art As a condensing guide for a magnifying observation device, there is, for example, one shown in Japanese Patent Application No. 139905/1983. This light condensing guide (light guide cap) has a hemispherical front part (hollow hemispherical shape) and a small hole in the center of this hemispherical front part. This system provides illumination light consisting mainly of light (light) and a suitable amount of incident light that leaks into it, making it possible to perform very effective observations. However, depending on the type of object to be observed and the purpose of observation, it may be possible to make more multifaceted observations by actively forming reflected light with a higher ratio, rather than just supplementary reflected light due to leakage. There are quite a few.

0003

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a light condensing guide that can actively utilize incident light.

0004

[Means and effects for solving the problem] Such an objective is to provide a first light condensing means having a hollow hemispherical front portion with a through hole formed in the center; A downward irradiation surface is formed around the through hole, and the front portion has a shape in which a curved surface continues gently from the irradiation surface,
This is achieved by a double-type condensing guide formed by a second condensing means disposed inside the first condensing means. In other words, in this dual-type condensing guide, side emitted light is obtained by the first condensing means, and incident light is obtained by the second condensing means. By changing the ratio of the amount of incident light from the light source to each condensing means, the ratio of the side emitted light and the incident light can be arbitrarily changed.

[0005] Furthermore, such a double-type condensing guide is
An overlapping cutout is formed at the rear of each of the first and second light condensing means, and the non-cutout part of the second light condensing means is formed in the overlapping notch of the first light condensing means. By fitting the non-cut portions of the first light condensing means into the stacking notches of the light condensing means and integrating both the first and second light condensing means, the light source can be made into a single ring. The structure can be made simpler.

[0006]

[Embodiments] Examples of the present invention will be described below. What is shown in FIG. 6 is an objective tool 2 using a double-type condensing guide 1 according to the present invention. 4
It also has a built-in light source 5 which will be described later, and the image of the observed object magnified by the optical system unit 3 can be transmitted to, for example, a CCDC.
Captured by an imaging system unit 4 including an imaging means such as an element,
This is sent to the main body of the observation device (not shown) and reproduced on a display for observation.

As shown in FIG. 1, the light source 5 includes a number of optical fibers 6 that guide light from a light emitting source (not shown).
The irradiation ends of 6, . . . are arranged in an annular shape as shown in FIG.

[0008] As shown in FIG. 1, etc., the double-type condensing guide 1 consists of a first condensing means 10 and a second condensing means 20 disposed inside the first condensing means 10. There is. The first light condensing means 10 is made of a transparent material such as acrylic resin, and consists of a hollow hemispherical front part 10f and a cylindrical rear part 10r, with the center of the front part 10f being made of a transparent material such as acrylic resin. A through hole 11 is provided in the rear part 10r, and four overlapping notches 12, 12, . . . are formed in a cross shape in the rear part 10r. This first light condensing means 10 is mainly used to obtain side light, and the illumination light from the light source 5 that enters from the entrance surface 13 of the rear part 10r and is guided inside by total reflection enters the through hole 11. Side emitted light Ls is obtained by emitting the light laterally from the irradiation surface 14 on the inner circumference.

The second condensing means 20 is also made of a transparent material, and its front part 20f has an irradiation surface 22 facing downward, that is, toward the observation object M, around the central through hole 21. It has a shape with a curved surface that continues gently from the irradiation surface 22, and its rear part 20r is
Similar to the first condensing means 10, four overlapping notches 23
, 23, . . . have a cross-shaped cylindrical shape. This second condensing means 20 is mainly for obtaining incident light, and the illumination light from the light source 5 that enters from the entrance surface 24 of the rear part 20r and is guided inside by total internal reflection is directed downward from the irradiation surface 22. By emitting the light, reflected light Ld can be obtained. However, since the irradiation surface 22 is wide, a part of the incident light Ld is transmitted through the through hole 1 of the first condensing means 10.
The incident light Ld that has hit the area around the observation area passes through the surface layer of the observation object M, and then is reflected inside and hits the observation area. This becomes transmitted light Lt that illuminates M from the inside.

Both the first and second condensing means 10, 20 have their respective rear portions 10r, 20r aligned with each other's overlapping notches 12.
, 12, . . . , 23, 23, .
4, 14, . . . , 25, 25, . If both the first and second light condensing means 10, 20 are integrated in this way, the entrance surfaces 13, 24 of both will form one ring, so that There is an advantage that a monocyclic light source 5 can be used, and the structure can be made simpler. This means that if you don't mind complicating the structure, you can install the light sources in two rings and make each light source correspond to the incident surface of each light collecting means instead of integrating both light collecting means. I'd say it's possible.

[0011] As described above, in this double-type condensing guide 1, the first condensing means 10 obtains the side emitted light Ls, and the second condensing means 20 obtains the incident light Ld. However, the ratio of the amount of incident light from the light source 5 to each condensing means 10, 20 is changed, that is, the respective incident surfaces 13, 24 are changed.
By changing the width ratio of the side light Ls and the incident light Ls, or by changing the light intensity of the corresponding light source,
The ratio of d can be changed.

0012

[Effect of the invention] The double-type condensing guide according to the present invention has the following features:
As explained above, the first light collecting means and the second light collecting means are combined, the first light collecting means obtains side emitted light,
In addition, since the second condensing means can obtain incident light, the incident light can also be actively utilized, and by changing the ratio of the amount of light incident on each condensing means from the light source, it is possible to The ratio of side light and incident light can be changed,
This allows for more multifaceted observations.

[0013]

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a light collection guide.

FIG. 2 is a bottom view of the light source.

FIG. 3 is a perspective view of a light collection guide.

FIG. 4 is a perspective view of the second condensing means.

FIG. 5 is a perspective view of the first condensing means.

FIG. 6 is a side view of an objective using a condensing guide.

[Explanation of symbols]

1. Light focusing guide 2 Objective tool 5 Light source 10 First condensing means 10f front 10r rear 11 Through hole 12 Cutout for stacking 20 Second condensing means 20f front 20r rear 21 Through hole 22 Irradiation surface 23 Cutout for stacking M Observation object

Claims (2)

[Claims] Claim 1: Connected to the tip of an objective tool equipped with an optical system for magnifying an image of an object to be observed and a light source for illuminating an observation site, and condensing illumination light from the light source onto the observation site. The light condensing guide for irradiation includes a first light condensing means having a hollow hemispherical front part with a through hole formed in the center, and a first light condensing means having a hollow hemispherical front part with a through hole formed in the center, and a downward irradiating means around the through hole. A second light collecting device, characterized in that it has a front portion in which a surface is formed and a curved surface portion continues gently from the irradiation surface, and the second light focusing device is arranged inside the first light focusing device. Heavy-duty light focusing guide. [Claim 2] Both the first and second condensing means each include:
It has a cylindrical rear portion having an overlapping notch, and the non-notched portion of the second light condensing means is connected to the overlapping notch of the first light condensing means. The first,
2. The double-type condensing guide according to claim 1, wherein both second condensing means are integrated.