JPS6040602B2 - light focusing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light concentrating device, and more particularly to a light concentrating device that can efficiently guide light from a weak light emitter or a very small light emitter to a spectroscopic system.

Conventionally, when performing side-light or spectroscopic measurements of light from a luminescent substance, such as a luminous substance or a chemically reactive substance, a light source P is placed at the center of a spherical mirror 1 and focused through a convex lens 2, as shown in FIG. The light was guided to a spectrometer 3, and the ellipsoidal mirror 5 as shown in FIG. 2 also served as a lens to condense the light.

However, with this method, it is completely impossible to efficiently guide the amount of light from the light source P to the spectroscope 3, and a large amount of invalid light 4 is generated.

However, if the light source is weak or minute, there is a drawback that spectroscopic measurements using a spectrometer are extremely difficult. on the other hand,
As shown in FIG. 3, the excitation light source Q, the crab light substance 6, and the rotating ellipsoid 7 are confined, and the excited crab light 8 is transmitted to the convex lens 2.
A method has been proposed in which the light is taken out through the entrance slit 8.
In this case, the excitation light source Q effectively excites the crab photosubstance 6, but there is a problem in that the crab light wavelength and the excitation wavelength mix and enter the entrance slit. There was a drawback to the weak emission of light that was not taken into account. The present invention has been developed in view of the current situation, and is capable of guiding light from a light source to the outside almost quantitatively, and is therefore extremely effective as a concentrating device for light particularly from weak or minute light sources. It has certain characteristics.

That is, the light concentrating device of the present invention is provided with a retroreflector that passes through one focal point of a rotating elliptical mirror whose inner surface is mirror-finished, and the light guide member is passed through the focal point through the retroreflector. It is characterized by the fact that it has been provided.

The present invention will be described below based on embodiments shown in the drawings. FIG. 4 shows a first embodiment of the present invention, in which a rotating ellipsoidal mirror 1
1, the inner surface 12 is a mirror surface, and a retroreflector 13 is provided passing through the second focal point F2 and perpendicular to the long rattan A of the rotating ellipsoidal mirror 11.

Further, a light guide member 14 is attached to the second focal point F2 through the retroreflector 13. Here, the rotating ellipsoidal mirror 11 means that the gate curve drawn on a plane can be rotated 360 degrees around Nagafuji.
It refers to a solid body formed by rotating the solid body, and in the present invention, the inner surface of this solid body is a mirror surface.

Furthermore, the retroreflector 13 used in the present invention is shown in FIG.
As shown in FIG. 5B, the reflecting surface 15 is a collection of orthogonal mirror surfaces, and as shown in FIG.
The reflected light 17 can be reflected in the same direction as the incident direction by changing the 0o direction.

Specifically, corner cubes used for traffic signs, automobiles, bicycle tail mirrors, etc., and Scotchlite made by bonding minute glass beads into a tape shape with a binder belong to this category, and these can be used as appropriate in the present invention. .

The light guiding section 14 is for guiding the light focused at the second focal point F2 to the outside of the rotating ellipsoidal mirror 11, and can be made of a glass rod, glass fiber, a tube with a mirrored inner surface, or the like. can.

These light guiding members 14 are appropriately selected and used depending on the nature of the light emitted from the light source placed at the first focal point F. For example, when a light guide fiber is used as the light guide member 14, the light focused at the second focal point F2 is extracted while undergoing repeated total reflection at the interface of the light guide fiber, and is guided to, for example, a spectrometer depending on the purpose. In this first embodiment, the retroreflector 13 can be removed together with the elliptical part 15 on the back side, and after installing the light source to be measured at the first focal point F, as will be described later, it can be sealed tightly. It has become.

Further, the ellipsoidal part 15 may have any shape, and the ellipsoidal part 15 may be omitted as long as the retroreflector 13 alone can prevent light from entering from the outside. FIG. 6 shows a second embodiment of the present invention, in which the retroreflector 13 has a conical shape, is vertically symmetrical with respect to the long axis A, and at the same time, the apex of the conical shape is located at the second focal point F2. It is set up as follows.

By making the retrouniform reflection mirror 13 conical in this way, the rotating elliptical mirror portion that provides a high incident angle to the light guiding member 14 is replaced with a conical retroreflection mirror, so that the first focal point F, The angle of incidence of the reflected light condensed at the second focal point F2 from the light source placed at the second focal point F2 as described later on the light guide member 14 can be controlled within a certain range, and the reflected light can be effectively guided to the outside. I can do it.

Therefore, when a glass fiber is used as the light guide member 14, the second focal point F2 of the glass fiber is
, i.e. depending on the limit of the angle of incidence that can be accepted at the second focal point F2, the retroreflector 13
It is only necessary to appropriately select and determine the conical shape of . Next, the functions of the optical concentrating device of the present invention will be explained based on FIG. 4.

First, assume that a light source is placed at the first focal point F.

Then, the mirror surface 12 of the rotating ellipsoidal mirror 11 emits from this light source.
The reflected light L is focused on the second focal point F2. Similarly, all the light reflected by the mirror surface 12 similarly travels to F2.
On the other hand, among the light emitted from the light source, the light incident on the retroreflector 13 is at the first focal point because the retroreflector 13 has the property of reflecting the reflected light in the same direction as the incident light as described above. The light is returned in the direction of F, passes through the first focal point F, is reflected by the mirror surface on the back side of F2, and is focused on the light source F2 as indicated by the arrow -.

In this way, the light from the light source F is either directly reflected by the mirror surface of the rotating ellipsoidal mirror and focused on the light source F2, or it is reflected by the retroreflector 13 and returned to the light source F, and the light is focused on the light source F. , is reflected by the mirror surface of the rotating ellipsoidal mirror on the back side of the light source F2, and in the end, almost all of the light from the light source F is focused on F2. will be done.

Then, as described above, the focused light is extracted by the light guide member 14 and guided elsewhere. FIG. 7 shows a third embodiment of the present invention, in which the optical concentrating device of the present invention is used in combination with a spectrometer.

That is, as mentioned above, the light from the light source P placed at the first total point F of the rotating ellipsoidal mirror is reflected by the mirror surface 12,
All of the light reflected by the retroreflector 13 is focused on the second focal point F2, guided by the light guide member 14, and then focused by the convex lens 18 and sent to the spectrometer 19. The measured values are displayed on the photon counting device 20. In FIG. 7, reference numeral 21 indicates an excitation light east, which is used to excite the light source P, and can be provided as necessary.

In addition, the light source P is an insertion part 2 provided on the back side of the first focal point F.
It is designed to be inserted by attaching it to the insertion part 2.
The inner surface of the mirror 2 may form a part of the mirror surface of the rotating ellipsoidal mirror 11, or it may be a retroreflector as shown in FIG. As mentioned above, in the present invention, a retroreflector is provided that passes through the second focal point of a rotating ellipsoidal mirror whose inner surface is mirror-finished, and a light guiding member is provided at the second focal point by passing through the retroreflector. It is distinctive in that it has been installed.

As a result, a light source is layered at the first focus of the rotating ellipsoidal mirror, and the light emitted from this light source is either reflected by the mirror surface of the rotating ellipsoidal mirror or reflected by a retroreflector. Even if the light is
The light is focused on the focal point. In other words, the light concentrating device of the present invention does not generate a large amount of invalid light unlike the secondary device, and
A light efficiency close to 0.00% is achieved.

Therefore, the device of the present invention is capable of quantitatively focusing the diverging light from a weak or minute light source and guiding it to the outside, and is particularly useful for guiding light from a weak or minute light source to a spectrometer or a measuring device. It can be said to be the most suitable forgery.

[Brief explanation of drawings]

Figures 1, 2, and 3 show the principle of a conventional optical concentrator. Figure 1 uses a spherical mirror, Figure 2 uses an ellipsoidal mirror, and Figure 3 uses a rotating ellipsoid. FIG. 4 is a schematic diagram showing the first embodiment of the present invention, FIGS. 5A and B are principle diagrams showing the function of the retroreflector used in the present invention, and FIG. FIG. 7 is a schematic diagram showing a second embodiment of the present invention, and FIG. 7 is a schematic diagram showing a third embodiment of the present invention. 11... Rotating ellipsoidal mirror, 13... Retroreflector, 1
4... Light guide village, F. ...First focal point, F2
...Second focus. Figure 1 Figure 3 Figure 4 Figure 5 (8) Figure 5 (A) Figure 2 Figure 6 Figure 7

Claims (1)

[Claims] 1. A light converging device characterized in that a retroreflector passing through one focal point of a rotating ellipsoidal mirror whose inner surface is mirror-finished is provided, and a light guide member is attached to the focal point by penetrating said retroreflector. .