JPH0741848U - Optical transmission device - Google Patents

Abstract

(57) [Abstract] [Purpose] To significantly improve the transmission efficiency of an optical transmission duct having a bent portion. [Structure] The reflecting structure of the bent portion of the optical transmission duct is connected by a reflecting tube having an elliptical cross section.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the field of lighting such as daylight use and artificial light, and is particularly used for optical transmission.

[0002]

[Prior art]

 There is a technique called "optical transmission" in which light is transmitted by using a cylindrical duct that internally reflects light and allowing the light to pass through the duct.

In this optical transmission device, a straight cylindrical duct may be used for linearly transmitting light, but a bent portion is required for transmitting light to a predetermined place by the duct system. There are cases.

For example, when the transmission direction is changed to a right angle direction as shown in FIG. 2, a plane reflecting mirror inclined at 45 ° to obtain a regular reflection effect with respect to the transmission direction and triangular plane reflecting surfaces on both side surfaces thereof are provided. A mirror 3 was provided to guide the light in a right angle direction.

[0005]

[Problems to be solved by the device]

 However, the light distribution shape of the outgoing light of the light transmitted in the cylindrical duct 1 (hereinafter simply referred to as “duct”) having a reflection effect depends on the light distribution shape at the time of incidence, but is usually And become axisymmetric. Of the axially symmetric emitted light, the component reflected by the central portion of the plane reflecting mirror 2 set to the angle of regular reflection with respect to the transmission direction is effectively reflected as the primary reflected light in the target direction, but the side reflecting mirror. The component reflected to 3 has the number of reflections of the second or higher order, so there is the problem that it cannot be reflected effectively, which is an obstacle to the transmission effect.

[0006]

[Means for Solving the Problems]

 As a concrete means for solving the above-mentioned problems, the present invention aims to improve the reflection efficiency of the bent portion of the optical transmission duct 1, and the end portion 5 of the duct is formed by the reflection tube 4 having an elliptical cross section. By connecting them, the number of specular reflections can be reduced, and a highly efficient optical transmission duct with a reflection effect can be obtained.

[0007]

【Example】

 Embodiments of the present invention will be specifically described below with reference to the drawings. In FIG. 1, for example, when the light transmitted from one duct 1 is transmitted at a right angle to the transmission direction, a right angle at which the end 5 of the duct 1 and the end 5 of the other duct are in contact at almost one point. In this state, a reflecting cylinder 4 having a primary curved surface in contact with the entire circumference of each end and having an elliptical cross section is provided. The reflecting cylinder is made of a material having a high reflectance similar to that of the duct, and the joining of the duct 1 and the reflecting cylinder 4 may be mechanical welding or the like, but there is no gap between the three types of reflecting mirrors as much as possible. It is good to

With the above structure, most of the light transmitted from the duct 1 is reflected by the elliptical reflecting cylinder 4 as primary reflected light and transmitted to the other duct 1. This improves the transmission efficiency of the bent portion.

As a result of comparing the conventional product and the embodiment under the same conditions, the conventional product has a low transmission efficiency of 50% and cannot effectively transmit light, whereas the bending product of the present invention has a high transmission efficiency. The efficiency is 80%, which is about 1.6 times that of the conventional product.

[0010]

[Effect of device]

 As described above, the present invention can greatly improve the transmission efficiency of the optical transmission duct having the bent portion, and greatly contributes to the practical use of optical transmission.

[Brief description of drawings]

1A and 1B are views showing an embodiment of the present invention, in which FIG. 1A is a perspective view, FIG. 1B is a front sectional view, and FIG.
(D) is an AA cross section.

FIG. 2 is a view showing a conventional example, (a) is a perspective view,
(B) is a front sectional view, (C) is a planar sectional view, (D)
Is an AA cross section.

[Explanation of symbols]

 1 Cylindrical Reflection Duct 2 Planar Reflector 3 Side Plane Reflector 4 Reflective Cylinder with Oval Section 5 End of Cylindrical Duct

Claims (1)

[Scope of utility model registration request] 1. An optical transmission device provided with a cylindrical duct having a reflection effect inside, wherein the bent portion of the duct is connected by a reflection tube having an elliptical cross section. .