JPH07272515A - Light source device for optical fiber - Google Patents

Abstract

PURPOSE:To provide such a light source device for an optical fiber as being capable of enhancing the usage factor of a light flux, limiting temperature rise inside the device to be lower and using the fiber of lower heat resistant temperature. CONSTITUTION:A hollow reflecting mirror 11 to encircle a light source 13 is formed elliptical. The light guiding part of an optical fiber 14 is at the same position as a secondary focal plane and a plane secondary reflecting mirror 15 is arranged on the vertical plane on the outer periphery of the light guiding part of the optical fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a light source device for an optical fiber.

[0002]

2. Description of the Related Art A conventional optical fiber light source device is, for example, as shown in FIG. 4, a reflector 2 having a spherical or elliptical shape, a halogen lamp, a mercury lamp, or the like.
One of a metal halide lamp and a xenon lamp is mounted, the light of the light source 1 is made incident on the fiber 3, and the light is guided to a desired position.

[0003]

By the way, according to the above-mentioned optical fiber light source device, the light incident on the optical fiber surface is about 30% of the total luminous flux from the light source, and there is a drawback that the utilization efficiency is low. Further, the remaining light is scattered and absorbed inside the light source device, and the temperature inside the device, especially the temperature of the mounting surface of the fiber rises, and there is a drawback that plastic fibers having a low heat resistance cannot be used.

The present invention has been made in view of the above points, and is an optical fiber which has a high utilization factor of a light flux, can suppress a temperature rise inside the apparatus to a low level, and can use a fiber having a low heat resistant temperature. It is an object of the present invention to provide a light source device for use.

[0005]

The present invention has the following constitution in order to solve the above problems. That is, according to the first aspect, in the optical fiber light source device, the hollow reflecting mirror surrounding the light source is formed of an ellipsoid. Further, the light introducing part of the optical fiber and the secondary focal plane are arranged at the same position. Further, a flat secondary reflecting mirror is arranged on the outer peripheral vertical surface of the light introducing portion of the optical fiber.

According to a second aspect of the present invention, in the optical fiber light source device, the hollow reflecting mirror surrounding the light source is formed of an ellipsoid behind the tip of the light source and is formed of a hemisphere in front of the tip of the light source. Further, the light introducing part of the optical fiber and the secondary focal plane are formed at the same position, and a flat secondary reflecting mirror is arranged on the outer peripheral vertical surface of the light introducing part of the optical fiber.

According to a third aspect of the present invention, the inside of the hollow reflecting mirror in the first and second aspects is cooled.

[0008]

According to the optical fiber light source device of the above-mentioned claim 1, the light is easily collected in the light introducing portion of the optical fiber,
Also, the projected light from the planar secondary reflecting mirror is secondary reflected,
The light having a small incident angle θ is effectively introduced into the optical fiber surface while the third reflection is performed. For light with a large incident angle θ, for example, θ = 45 ° to 90 °, no matter how much is incident on the end face of the optical fiber, it is not effective incident light because of the basic characteristics of the optical fiber, and scattering, absorption, and reflection occur. Will be done. Further, since the flat secondary reflecting mirror is arranged, the ratio of the light projected to the extra portion is small, and the temperature rise inside the device can be suppressed low.

According to the optical fiber light source device of the second aspect, it is easy for light to enter the light introducing portion of the optical fiber from various angles, and it is possible to obtain an averaged illumination effect with little brightness and darkness on the illuminated surface.

According to the optical fiber light source device of the third aspect, it is possible to suppress an increase in temperature inside the device and use an optical fiber having a low heat resistant temperature.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 11 denotes a hollow reflecting mirror that surrounds a light source, and is formed of an ellipsoid. The inner surface reflects visible light (solid arrow in FIG. 1) and transmits ultraviolet light and infrared light ( A cold mirror is formed). The hollow reflecting mirror 11 has 44 and 76 mm in the opening 12.
The length between the focal points is about 45 mm. Further, the reflectance per one surface of the reflecting mirror is 99% or more in the visible light region, and even if the secondary reflection and the tertiary reflection are repeated, the light loss is extremely small. 13 is a hollow reflecting mirror 1
1 is a light source mounted inside the hollow reflecting mirror 1
When 1 has the above-mentioned size, a 12-volt, 50-watt halogen lamp is mounted. The light source is arranged at a primary focus. In addition to halogen lamps,
A mercury lamp, a metal halide lamp, or a xenon lamp may be used by changing the size of the hollow reflecting mirror.

Reference numeral 14 is an optical fiber, for example, 0,
75 pieces of 5 mmφ element wires are bundled to form about 5φ. The optical fiber is made of plastic material.

Reference numeral 15 denotes a planar secondary reflecting mirror which is arranged on the secondary focal plane of the optical fiber. Further, the light introducing portion of the optical fiber and the secondary focus position are at the same position. According to the optical fiber light source device, light is efficiently collected in the light introducing portion of the optical fiber. Further, the projected light from the planar secondary reflecting mirror is efficiently introduced into the optical fiber while undergoing secondary reflection and tertiary reflection. According to the optical fiber light source device, 60% of the total luminous flux is introduced into the optical fiber.

As shown in FIG. 2, the hollow reflecting mirror 11 in claim 2 has an ellipsoidal rear portion and a hemispherical front portion. Further, as in the structure shown in FIG. 1, a flat secondary reflecting mirror is arranged on the secondary focal plane, and the light introducing portion of the optical fiber and the secondary focal point are at the same position. Further, according to the optical fiber light source device of the same structure, the light projected onto the planar secondary reflecting mirror is an ellipsoid or hemisphere of the hollow reflecting mirror, and is efficiently introduced into the optical fiber while performing secondary reflection and tertiary reflection. It According to the optical fiber light source device, 60% of the total luminous flux is introduced into the optical fiber.

As shown in FIG. 3, the optical fiber light source device having the structure described in claim 3 is configured such that the hollow reflecting mirror has a gap 16 through which cooling air is flowed and discharged from the rear portion. However, it is configured to cool the inside. Reference numeral 17 is a cooling fan provided on the back surface of the reflector. When the inside of the hollow reflecting mirror is cooled, the internal temperature rise can be suppressed to a low level, and an optical fiber having a low heat resistant temperature can be used.

[0016]

According to the above-mentioned optical fiber light source device of the present invention, the luminous flux can be efficiently introduced into the optical fiber, and the proportion of the light projected to the extra portion by the flat secondary reflecting mirror. Has a unique effect that the temperature rise inside the apparatus can be suppressed to a low level.

According to the optical fiber light source device of the second aspect, since light enters the light introducing portion of the optical fiber from various angles, it is possible to obtain an averaged lighting effect with little light and dark on the illuminated surface. It has a great effect.

According to the optical fiber light source device of the third aspect, since the temperature rise inside the device can be suppressed to a low level, there is a unique effect that an optical fiber having a low heat resistant temperature can be used.

[Brief description of drawings]

FIG. 1 is a side view of an optical fiber light source device of the present invention.

FIG. 2 is a side view of another optical fiber light source device of the present invention.

FIG. 3 is a side view of another optical fiber light source device of the present invention.

FIG. 4 is a side view of a conventional optical fiber light source device.

[Explanation of symbols]

 11 Hollow Reflector 12 Opening 13 Light Source 14 Optical Fiber 15 Secondary Reflector 16 Gap

Claims (3)

[Claims] 1. A light source device for an optical fiber, wherein a hollow reflecting mirror surrounding the light source is formed of an ellipsoid, a light introducing portion of the optical fiber and a secondary focal plane are formed at the same position, and further, a light introducing portion of the optical fiber is formed. A light source device for an optical fiber, characterized in that a flat secondary reflecting mirror is arranged on a peripheral vertical surface. 2. In a light source device for an optical fiber, a hollow reflecting mirror surrounding the light source is formed of an ellipsoid behind the tip of the light source, and is formed of a hemisphere in front of the tip of the light source. An optical fiber light source device characterized in that a secondary focal plane is formed at the same position, and a planar secondary reflecting mirror is arranged on the outer peripheral vertical surface of the light introducing portion of the optical fiber. 3. A light source device for an optical fiber according to claim 1, wherein the hollow reflecting mirror is configured to be cooled.