JPH059693Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention relates to a light source device such as an optical fiber used in an optical system that requires light condensation. In addition to efficiently removing heat rays before they reach the light-receiving part such as the light input end face of an optical fiber, the center part of the curved reflector is formed into a spherical shape and the periphery into an elliptical shape. The reflected light from the light source can be reliably focused on the light receiving part such as the light input end face of the optical fiber, increasing the effectiveness of the light from the light source. It is an object of the present invention to provide a light source device such as a highly versatile optical fiber that can be effectively used for quartz fibers and the like that require a small incident angle because the angle is relatively small with respect to the axis.

(Prior art and its problems) Conventionally, as an optical fiber light source device,
This is because the curved reflector a has an ellipsoidal shape, so that some of the rear emitted light from the light source b placed at its first focal point a' is reflected by the central surface of the curved reflector a. A part of c becomes reflected light c', and this reflected light c' is provided to focus the forward irradiated light d onto a light-receiving part such as the light input end face e of the optical fiber disposed at the second focal point a''. Since the light passes through the condensing lens f, the light is not focused on the light receiving section such as the light entrance end surface e, and the effectiveness of the light source b with respect to the light receiving section such as the light entrance end surface e is low.

On the other hand, in the case of FIG. 3B, since the curved reflecting mirror a is spherical, the light source b disposed at its center point a'
A part g of the backward illumination light reflected by the peripheral surface of the curved reflector a becomes reflected light g', which is reflected by the condenser lens h.
However, since the angle of the reflected light g' with respect to the optical axis i is large, the angle of incidence j of the reflected light g' on the light receiving part such as the light entrance end face e is narrowed by the optical fiber.
It is also large, making it difficult to use with quartz fibers that require particularly small incident angles, and lacking in versatility.

In addition, in Japanese Patent Publication No. 57-53924, a linear light emitter is placed at one focal point of an elliptical cylindrical concave reflector, and a cylindrical condenser lens is placed at the aperture position of the elliptical cylindrical concave reflector. A "light source device" consisting of an optical fiber handle and an optical fiber handle has been published, but this technology, like the technology shown in FIG. It is difficult to use with quartz fibers that require angles and lacks versatility.

Moreover, since the reflected light from the elliptical cylindrical concave reflector and the light from the light emitter are not all focused on one point, there is a problem in that the irradiation end face of the optical fiber cable with a small diameter cannot be effectively irradiated.

(Means for solving the problem) This idea was made to solve the above problem. A condenser lens and a heat ray reflection filter disposed in front of the condenser lens are arranged in parallel with their optical axes aligned, and the curved reflector has a spherical central portion and a spherical periphery. It is formed as an elliptical part having a smaller curvature than the spherical part, and the center point of this spherical part and the first focal point of the elliptical part are the center of the light source, and the second focal point of the elliptical part and the focal point of the condensing lens are connected to the light source. They are aligned with the light-receiving part of the fiber light-incoming end face, etc., and
An optical fiber, etc., characterized in that the reflected light from the curved reflector and the convergent light from the light source condensed by the condensing lens are made to coincide with each other and reach the light receiving part through the heat ray reflective filter. All of the above problems are solved by providing a light source device.

(Example) An example of this invention will be described based on the drawings.

1 and 2 are diagrams for explaining a light source device such as an optical fiber according to an embodiment of this invention, and numeral 1 in the figures indicates the light source device.

In this light source device 1, a light source 2, a curved reflector 3 disposed behind the light source, a condensing lens 4 disposed in front of the light source 2, and a heat ray reflective filter 5 have optical axes 6 aligned with each other. They are arranged in parallel.

In this embodiment, the light source 2 is preferably a small and high-luminance one such as a xenon lamp, and its center 2' is located on the optical axis 6.

In this embodiment, a heat ray transparent curved reflector 3
As such, a cold mirror that transmits only heat rays is preferably used, and the center portion is a spherical portion 3a, and the periphery of this spherical portion 3a is formed as an elliptical portion 3b having a smaller curvature than the spherical portion 3a.

The center point 3a' of the spherical surface part 3a and the first focal point 3b' of the elliptical surface part 3b are aligned with the center 2' of the light source 2.

The second focal point 3b'' of the elliptical surface portion 3b coincides with the center point 7' of the optical fiber entrance end face 7 or any other arbitrarily set point.

In this embodiment, the condenser lens 4 is composed of a plurality of condensing lenses, and the focal point 4' thereof is aligned with the center point 7' of the light entrance end face 7 of the optical fiber or any other arbitrarily set point.

In this embodiment, the heat ray reflecting filter 5 is a filter that reflects only heat rays, and is formed into a spherical shape.

The center point 5' of the heat ray reflection filter 5 is aligned with the center point 7' of the optical fiber light receiving end face 7 or any other arbitrarily set point.

In the figure, 8 is an optical fiber, 9 is a plug attached to the optical fiber 8, 10 is a socket into which the plug 9 is inserted, 11 is a plurality of heat dissipation fins protruding from the circumferential surface of the socket 10, and 12 is a heat dissipation fin. This is a cooling fan that is disposed below the heat radiation fins 11 and blows air to the heat radiation fins 11.

The configuration of the light source device 1 according to an embodiment of this invention is as described above, and its operation will be explained below.

This light source device 1 is suitably used as a light source for an optical fiber 8, and when the light source 2 is first turned on, the light source 2
The forward illumination light 13 of the light source 2 is focused via the condenser lens 4 on the center point 7' of the optical fiber entrance end face 7 or any other arbitrarily set point, while the part of the rear illumination light 14 of the light source 2 is After becoming reflected light 14' on the surface of the spherical part 3a of the heat-transmitting curved reflector 3, it passes through the center 2' of the light source 2, overlaps with the forward irradiation light 13, and enters the optical fiber via the condenser lens 4. The center point 7' of the light end face 7 is focused on another arbitrarily set point.

On the other hand, a part of the backward illumination light 14 becomes reflected light 15' on the surface of the ellipsoidal portion 3b, and then is focused at the center point 7' of the optical fiber entrance end face 7 at a small angle with respect to the optical axis 6. .

Incidentally, each of the lights 13, 14', and 15' has its heat rays removed by the curved reflector 3 and the heat ray reflection filter 5 and is focused on the light input end face 7 of the optical fiber, so that the heating of the light input end face 7 of the optical fiber is reduced. and further heat dissipation fins 11
The optical fibers are efficiently cooled by the cooling fan 12 and the binding resin of the optical fibers is prevented from turning black due to burnout, and the amount of light transmitted by the optical fibers 8 is prevented from being reduced.

In particular, since the center point 5' of the heat ray reflecting filter 5 is aligned with the center point 7' of the light input end face 7 of the optical fiber, the heat rays of each light beam 13, 14', 15' pass through the same filter 5.
The light is reflected uniformly and reliably at all locations, and heating reduction occurs uniformly and at a high rate.

(Effects of the invention) As explained above, this invention consists of a light source, a heat-transmitting curved reflector placed behind it, a condensing lens placed in front of the light source, and a condensing lens placed in front of the condensing lens. and a heat ray reflecting filter disposed in the mirror are arranged in parallel with their optical axes aligned, and the curved reflecting mirror has a spherical part at the center and a periphery of the spherical part as an elliptical part having a smaller curvature than the spherical part. is,
The center point of the spherical surface portion and the first focal point of the elliptical surface portion are aligned with the center of the light source, and the second focal point of the elliptical surface portion and the focus of the condensing lens are aligned with the light receiving portion such as the light input end face of the optical fiber. , an optical fiber, etc., characterized in that the reflected light from the curved reflector and the convergent light from the light source condensed by the condensing lens are made to coincide with each other and reach the light receiving section via the heat ray reflective filter, etc. Since it is a light source device, it has the following effects.

This light source device is suitably used as a light source for optical fibers, especially for small-diameter optical fiber cables.When the light source is first turned on, the forward irradiation light from the light source is transmitted through the condensing lens to the input end face of the optical fiber. On the other hand, a part of the rear emitted light becomes reflected light on the surface of the spherical part of the curved reflector, passes through the center of the light source, overlaps with the front emitted light, and is reflected by the condensing lens to the light receiving part. focused.

On the other hand, a part of the backward illumination light becomes reflected light on the surface of the elliptical part, and then is focused on the light receiving part at a small angle with respect to the optical axis.

Since the central part of the curved reflector is made into a spherical part, the light reflected at the same part overlaps with the forward irradiation light and is focused on the light receiving part by the condenser lens. The effectiveness of light to the light receiving surface of the light source can be increased compared to a case where the reflected light from the central part cannot be used.

Furthermore, since the periphery of the spherical part is an elliptical part, the reflected light is focused on the receiving surface at a small angle with respect to the optical axis, unlike conventional spherical reflectors, which are focused at a large angle. It can also be effectively used for quartz fibers that require a small incident angle, increasing versatility.

In addition, the heat rays of the irradiation light generated from the light source are removed by the heat ray transparent curved reflector and the heat ray reflection filter, which prevents the light receiving part on the light receiving end surface of the optical fiber from being burnt out and improves the light receiving efficiency of the light receiving part. It has the excellent effect of maintaining good quality.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a light source device such as an optical fiber according to an embodiment of this invention, FIG. 2 is an explanatory diagram of the usage state of the same device, and FIGS. 3A and 3B are explanatory diagrams of a conventional example. 1... Light source device, 2... Light source, 2'... Center,
3... Curved reflector, 4... Condensing lens, 3a...
Spherical part, 3b...elliptical part, 3a'...center point, 3
b'...First focus, 3b''...Second focus, 4'...Focus, 6...Optical axis, 7...Optical fiber light entrance end surface.

Claims (1)

[Scope of utility model registration request] The optical axes of the light source, the heat-transmitting curved reflector placed behind it, the condensing lens placed in front of the light source, and the heat-reflecting filter placed in front of the condensing lens align. The curved reflecting mirrors are arranged in parallel in a state in which the center part is a spherical part and the periphery of this spherical part is formed as an elliptical part with a smaller curvature than the spherical part, and the center point of this spherical part and the ellipsoidal part are arranged in parallel. One focal point is the center of the light source, the second focal point of the ellipsoidal surface part, and the focal point of the condensing lens are respectively aligned with a light receiving part such as an optical fiber light input end surface, and the curved reflecting mirror is passed through the heat ray reflecting filter. A light source device such as an optical fiber, characterized in that reflected light from the light source and converged light from the light source condensed by the condensing lens are made to coincide with each other and reach the light receiving section.