JPS59114511A - Light condensing device - Google Patents

Abstract

PURPOSE:To condense lights over a wide angle and improve the light transmitting characteristic of a light condensing device, by installing a light condensing surface whose diameter is smaller than that of a light transmitting body and which intersects the main axis of the body at right angles to the front end of the body having a side face parallel to the main axis and a reflecting side face which is curved and projected outward between the light condensing surface and side face. CONSTITUTION:A side face 11 parallel to the main axis 4 of a light transmitting body 10 and a light condensing surface 12 of a small diameter which intersects the main axis 4 at right angles are installed to the light transmitting body 10 made of acrylic resin, etc., with the latter to the front end and, at the same time, a reflecting side face 13 having the shape of the profile of a parabola is installed between the light condensing surface 12 and side face 11. A light perpendicularly irradiated upon the light condensing surface 12 is transmitted to a light transmitting body 1 in parallel with the main axis 4. Another light obliquely introduced through the focal point F of the reflecting side face 13 is totally reflected by the reflecting side face 13 and transmitted to the light transmitting body 1 in parallel with the main axis 4. Lights introduced other than these two are transmitted to the body 1 after they are totally reflected. Therefore, light condensation with a wide angle becomes possible and the light transmitting characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light condensing device, and more particularly to a light condensing device for condensing light over a wide range and transmitting light in a direction close to the principal axis.

FIG. 1 shows a conventional example of a light condensing device attached to the tip of a light pen or the like. In the optical condensing device, a cylindrical light transmitting body 2 made of a material with a high refractive index such as acrylic resin or optical glass is provided at the tip of a light transmitting body 1 such as an optical fiber cable. A convex lens 3 is integrally disposed at the tip of a body 2.

With such a structure, the light rays 5A, 5B, 50, and 6D that are incident on the convex lens 3 parallel to the optical axis (principal axis) 4 are focused at the focal point F, and then become the light ray 5A that is coincident with the optical axis 4. , and reaches the light transmitting body 1 while being reflected by the side surface 2a of the light transmitting body 2. Furthermore, light rays incident on the convex lens 3 at an angle with respect to the optical axis 4 are also reflected by the side surface 2a and guided to the light transmission body 1.

However, if the light ray 5E has a large angle with the optical axis 4 as shown in FIG. When the angle is /I- smaller than the normal angle, there is no total reflection at the side surface 2a, and a phenomenon occurs in which light escapes outside the light transmitting body 2 as light leakage 5F, and the light collection performance deteriorates. This phenomenon shows that when the light ray 5E meets the conditions shown in FIG. 1, the angle with the optical axis 4 becomes larger as the light ray passes through the convex lens 3, so that the light leakage 5F tends to increase.

The present invention was made in consideration of these backgrounds, and its purpose is to make it possible to collect light from wide-angle storms, and to convert the direction of transmission of light rays to a direction that approximates the principal axis.
The purpose is to improve light transmission characteristics.

In order to achieve these objectives, the present invention includes 1. At the base end of the light transmitting body having a side surface parallel to the main axis, a light converging surface that is smaller in size than the prestige transmitting body and that burns directly with the main axis is provided, and between the test light converging surface and the side surface, an outer It is characterized by a curved and protruding reflective side surface.

In the following, non-invention will be explained based on an example shown in Figure 2.
do.

The light transmitting body 10 in this embodiment is made of a high refractive index material (
For example, the acrylic patterned vessel mentioned above) is formed with a side surface 11 parallel to the main l1u (optical axis) 4, and a side surface 11 at the base end.
The diameter is smaller than the outer diameter of the part, and a main shaft 4 and a condensing surface 12 in a direct firing state are provided, and a side surface II and a condensing surface 12 are provided.
A reflective side surface 13 that curves outward and protrudes outward so as to connect the reflective side surface 13 is disposed between the reflective side surface 13 and the reflective side surface 13.

Further, the vertical cross-sectional shape of the reflective side surface 13 is formed to draw a parabola, and when this portion is viewed from the optical transmission body 1 side, it becomes a concave mirror. Therefore, in order to utilize the phenomenon that light rays parallel to the optical axis 14 are focused on the focal point F, the focal point F is
It is set so as to be placed on the top (also on the main shaft 4 in one embodiment).

A case in which light rays enter the light transmitting body 10 having such a configuration from each direction will be described below.

■When the light ray enters in the direction perpendicular to the condensing surface 12,
If it is within the area of the light collecting surface 12, air and the light collecting surface 12
The direction of the light is not changed at the boundary with the main axis 4, and all the light is transmitted to the optical transmission body 1 in a straight line parallel to the main axis 4, and the amount of attenuation between the light beam and the light beam is minimized.

■The light rays 14A and 14B obliquely intersect the converging surface 12 and the focal point F
When the light passes through the condensing surface 12, it is refracted at the boundary with the condensing surface 12 and then totally reflected at the reflective side surface 13, so all of it is converted into parallel rays and becomes parallel to the principal axis 4, regardless of the angle of incidence on the condensing surface 12. The light travels straight, is transmitted to the optical transmission body 1, and its attenuation amount is small.

■ When the light ray 14a obliquely intersects the condensing surface 12 and is away from the focal point F, it is refracted at the boundary between the outside air and the condensing surface 12, and then repeats total reflection on the side surface 11, causing the optical transmission body reach. Then, the photoconductor lO is relative to the air /8 (
Folding 4-1 / Sl[l 45°=, /2-=:1.4
If it is made of one or more particles (having a large refractive index), all of the light rays incident on the condensing surface 12 will be totally reflected on the 11111 surface 11 and transmitted.

■In addition, it is also possible to collect light from the reflection III and 13 depending on your safety. For example, when the light ray 14D obliquely intersects the optical axis 4 and enters the reflection 1i11 [II] 13 as shown in FIG. It reaches the transmitter 1.

Next, the individual embodiments will be explained.

[Stocks] 1 Reflective side surface 13 and 1li indicated by X on the second side
It is also possible to apply a blood removal finish (aluminum steam shield, etc.) to each of the il + lees 11 to reduce the reflection efficiency by ~j. In this case, anti! Although the light-converging effect of the -J 1ltii surface may be overlooked, it is effective when the area around the phototransmitter 10 is water, oil, etc., and there is little difference in refractive index.

(G) Reflection m[ux3 is - "The concave shape can be replaced with a parabola and other curves such as an anti-spiral shape.

In this case, a logarithmic spiral shape is advantageous when the area of the converging surface 12 is small.

(c, - The position of the building point F may be shifted from the center of the condensing surface 13 to the periphery of the condensing surface 13. For example, in FIG. 2, the reflection 0111 and 13 are left in the same shape, 0! Parallel the 11 surface 11 and the reflective side surface 13 in the vertical direction?, the diameter of the condensing surface] 3 /''・cutting light minute P
For example, it increases one's abilities.

(a) The cross-sectional shape of the light transmitting body 10 can be changed from a circle to another shape, for example, it can be formed as a rectangle with a vertical Bjr surface shape as shown in FIG. Is it deformed? You can also

As is clear from the above explanation, according to the present invention, the light collecting surface is made into a planar shape and a curved anti-extension j surface is provided, so that light can be collected at a wide angle. The light beam incident on the condensing surface is reflected by the reflective side surface and converted to be almost parallel to the principal axis, thereby significantly improving the light transmission characteristics. In addition, since the shape of the light transmitting body is square root, it can be used for a wide range of packaging applications.

[Brief explanation of the drawing]

FIG. 1 is a 414-dimensional explanatory diagram of the main part showing a conventional example, and FIG. 2 is a diagram illustrating the construction of the main part showing an embodiment of the present invention. l...Original transmitter, 4...Main axis (optical axis), lO...
Light transmitting body, 11... side surface, 12... condensing surface, 13.
...How many songs do you reflect on? Applicant: Ishikawajima Shima Heavy Industries Co., Ltd.

Claims (1)

[Claims] At the base end of the light transmitting body having a field parallel to the main axis, a light converging surface is provided where the housing of the dazzling light transmitting body is also manual and which burns directly with the main axis, and between the resultant light surface and the side surface, A light condensing device characterized by having a reflective side surface that curves outward.