JPH059694Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a light source device used in an optical system that requires light condensation, such as an optical fiber. In addition to efficiently removing the fiber before it reaches the light receiving part such as the light receiving end face of the fiber, heat dissipation fins and cooling fans are provided around the light receiving part to prevent burnout due to reflected light from the optical fiber receiving part and to remove light reflected from the light source. The light is reliably focused on the optical fiber light receiving section to maintain good light receiving efficiency of the light receiving section, and the light incident angle of the optical fiber light receiving end face to the light receiving section is made small with respect to the optical axis. An object of the present invention is to provide a highly versatile optical fiber light source device that can be effectively used for fibers that require the following.

(Prior art and its problems) Conventionally, there is a light source device such as an optical fiber as shown in FIG. The composite light c is overlapped with the light, and this composite light c is passed through the condensing lens f.
The light is focused on a light-receiving part such as the light input end face d of the optical fiber through the light receiving part d, and the heat rays contained in the composite light c are removed by passing through a heat ray reflection filter e during the collection.
Since this heat ray reflection filter e is formed into a flat plate shape, the transmission angle of the composite light c to the filter e differs depending on the location, and when the transmission angle of the composite light c is close to a right angle, the heat ray reflection efficiency is good. However, as the angle deviates from the right angle, the efficiency decreases, and the filter e cannot fully fulfill its function of reflecting heat rays, and the light-receiving part, such as the light input end face d of the optical fiber, is burnt out, and the light-receiving efficiency of the light-receiving part decreases. This was a major cause of deterioration.

In addition, as a lighting device for the light receiving axis of an optical fiber, etc., in Utility Model Application Publication No. 58-100312 "Optical Fiber Lighting Apparatus", the end surfaces of the lamp and the optical fiber are provided facing each other, and the center of the lamp and the optical fiber are placed around the circumference of the lamp. A technology has been disclosed in which reflecting mirrors each having a focal point at the end face of the optical fiber are provided, and a condensing lens is provided between the lamp and the end face of the optical fiber. ”
, a light guide fiber bundle having an entrance end face near the other focal point is located near the other focal point, and a reflection mirror between the light source and the light guide fiber bundle entrance end face. A technique in which a heat shield plate is provided is disclosed.

Furthermore, in Utility Model Application Publication No. 50-115043, "Optical System Device for Fiberscope," there is a light source, a reflecting mirror, a condensing lens that can pass only visible light, and a light receiving part of a light guide near the focal point of this condensing lens. Disclosed is a technology in which the

All of these technologies are designed to efficiently focus the light from the light source onto the light input end face of a light guide, etc., but they all prevent the light input end face from being burnt out due to heat and are difficult to use for general purpose. It was insufficient.

In other words, in Utility Model Publication No. 53-39243, "Light source device for light guide fiber bundle," the reflected light from the light source is irradiated to the light input end face using a reflective heat shield plate with a non-planar surface on the light source side. 1978-
In the technology of No. 100312 "Fiber Optic Lighting Equipment",
A convex lens or an infrared absorbing glass plate and a Fresnel lens are used to condense the light reflected from a light source by a reflecting mirror at an angle less than the critical incidence angle, and the light enters the end face of an optical fiber. However, there was a problem that it could not be applied to optical fiber lighting equipment, such as quartz fiber, which requires an extremely small incident angle of 20 to 30 degrees.

Furthermore, in Utility Model Application Publication No. 50-115043, "Optical System Device for Fiberscope," the purpose is to introduce light into the light receiving part at as large an angle as possible using a condensing lens, so it The problem was that it was not suitable for cases where light entry was required.

In addition, all of these disclosed technologies simply interpose either an infrared absorbing glass plate, a condensing lens, a reflective heat shield, etc. between the light source and the light incident end surface, so that the reflected light from the light source is further reduced. A small angle was not sufficient to efficiently remove the hot rays and to reliably prevent burnout on the light incident end face of the optical fiber.

On the other hand, in Utility Model Publication No. 52-55091,
A "attenuation filter" is disclosed in which the outer surface is formed to be substantially perpendicular to the incident light so as not to impair the characteristics of obliquely incident light.

This technology is used in photoelectric illuminance meters, etc., and is an improved neutral density filter that eliminates the need to correct the angular characteristics for obliquely incident light. The problem was that it was insufficient to efficiently condense the reflected light from the light source at a small angle and to reliably prevent burnout on the light incident end face.

(Means for solving the problem) This idea was made to solve the above problem. A plurality of condensing lenses and a heat ray reflecting filter disposed in front of the condensing lenses are arranged side by side with their optical axes aligned, and the curved reflector has a spherical central portion, and The periphery of this spherical part is formed as an ellipsoidal part with a smaller curvature than the spherical part, and the condensing point of the light source condensed by the curved reflecting mirror and the condensing lens is aligned with the light receiving part of the light input end face of the optical fiber. Become,
The heat ray reflecting filter is formed in a spherical shape with the light condensing point as the center, and a plurality of heat dissipation fins are protruded from the circumferential surface of the light input end surface of the optical fiber, and a cooling fan is provided below the heat dissipation fins. All of the above-mentioned problems are solved by providing an optical fiber light source device characterized in that the optical fiber is arranged in the form of an optical fiber.

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

FIGS. 1A and 1B are diagrams illustrating an optical fiber light source device according to an embodiment of this invention, in which numeral 1 indicates the light source device.

This light source device 1 includes a light source 2, a curved reflector 3 disposed behind the light source, a plurality of condensing lenses 4 disposed in front of the light source 2, and a plurality of condensing lenses 4 disposed in front of the condensing lenses 4. and a heat ray reflecting filter 5 are arranged in parallel with their optical axes 6 aligned.

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 cold mirror that transmits only heat rays is preferably used as the curved reflecting mirror 3, and the center portion is a spherical portion 3a.
The circumference a is formed as an ellipsoidal surface portion 3b having a smaller curvature than the spherical surface portion 3a.

The center point 3a' of the spherical surface part 3a and the first focal point 3b' of the ellipsoidal 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 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 one that reflects only heat rays, and is formed into a spherical shape centered on the center point 7' of the light input end face 7 of the optical fiber, which is the focal 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 11. This is a cooling fan that is disposed below 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.

Next, the operation of the light source device 1 according to the embodiment of the invention will be described.

This light source device 1 is suitably used as a light source for an optical fiber 8, and in the one shown in FIG.
When the light source 2 is turned on, a portion of the rear emitted light from the light source 2 is reflected by the surface of the spherical portion 3a of the curved reflector 3, passes through the center 2' of the light source 2, and overlaps the forward emitted light to form composite light 13. It is focused on the center point 7' of the optical fiber entrance end face 7 or any other arbitrarily set point via the condensing lens 4, while the other part of the backward irradiation light is reflected on the surface of the ellipsoidal part 3b. After being made 14,
The light is focused at a small angle with respect to the light source 6 at the center point 7' of the optical fiber entrance end face 7 or any other arbitrarily set point.

In this way, the backward illumination light is reflected by the surfaces of the spherical part 3a and the elliptical part 3b of the curved reflector 3 and becomes reflected light.At this time, the heat rays 16 are transmitted and removed, while the composite light 13 including this reflected light is transmitted. , the reflected light 14 and the forward irradiation light 15 pass through the heat ray reflection filter 5, at which time the heat rays 16 are further reflected and removed and focused on the center point 7' of the light input end face 7 of the optical fiber or any other arbitrarily set point. However, since the heat ray reflection filter 5 is formed into a spherical shape centered at the center point 7' or any other arbitrarily set point, the light passing through it crosses the tangent line of the filter 5 perpendicularly at any point. However, the heat rays 16 are removed by the maximum reflection efficiency of the filter 5, the heating of the light input end face 7 of the optical fiber is reduced, blackening due to burnout of the binding resin of the optical fiber is prevented, and the amount of light transmitted by the optical fiber 8 is reduced. This prevents the reduction of

Further, the optical fiber light input end face 7 has a heat dissipation fin 1.
1 and a cooling fan 12, and burnout of the binding resin is further effectively prevented.

(Effects of the invention) As explained above, this invention consists of a light source, a curved reflector that transmits heat rays placed behind it, a plurality of condensing lenses placed in front of the light source, and a condensing lens placed in front of the light source. A heat ray reflecting filter placed in front of the optical lens is arranged in parallel with the optical axis aligned with the heat ray reflecting filter, and the curved reflecting mirror has a spherical part at the center and a pole smaller around the spherical part than the spherical part. The convergence point of the light source, which is formed as an elliptical surface with a curved surface and is condensed by a curved reflecting mirror and a condensing lens, is aligned with the light receiving part of the light input end face of the optical fiber, and the heat ray reflection filter focuses this condensing light. The optical fiber is formed into a spherical shape centered on a point, and a plurality of heat dissipation fins are protruded from the circumferential surface of the light input end surface of the optical fiber, and a cooling fan is disposed below the heat dissipation fins. Since it is an optical fiber light source device, it has the following effects.

This light source device is suitably used as a light source for optical fibers, particularly for optical fiber cables with a small diameter. When the light source is turned on, the forward emitted light from the light source is reflected by curved reflected light and becomes reflected light. Heat rays are transmitted and removed by a curved reflector.

On the other hand, this reflected light passes through a heat ray reflection filter together with the forward irradiation light from the light source, and at that time, the heat rays are further reflected and removed and focused on a light receiving part such as the light entrance surface of an optical fiber located at the focal point. Since the heat ray reflection filter is formed into a spherical shape centered on this light receiving part, the light passing through it crosses the tangent line of the filter perpendicularly at any point, and the heat rays are removed with the maximum reflection efficiency of the filter. This prevents the light-receiving portion of the light receiving end face of the optical fiber from being burnt out, and maintains good light-receiving efficiency of the light-receiving portion.

In addition, since the periphery of the spherical part is an elliptical part, the reflected light is focused on the light 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 be suitably used for fiber cables that require a small incident angle, and has excellent versatility.

In addition, heat dissipation fins and cooling fans are installed on the light input end face of the optical fiber cable.
Together with the heat ray transparent curved reflector and the heat ray reflection filter, it is possible to reliably prevent burnout caused by reflected light on the light input end face of the optical fiber.

Therefore, an optical fiber light source device is provided that is capable of focusing the reflected light from the light source at a smaller angle while effectively removing heat rays, and is equipped with sufficient means to prevent burnout of the light input end face of the optical fiber. It has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an optical fiber light source device according to an embodiment of the invention, FIG. DESCRIPTION OF SYMBOLS 1... Light source device, 2... Light source, 3... Curved reflector, 3a... Spherical part, 3b... Elliptical surface part, 4...
Condensing lens, 5... Heat ray reflection filter, 6... Light source, 7... Optical fiber entrance end face, 11... Heat dissipation fin, 12... Cooling fan.

Claims (1)

[Scope of utility model registration request] A light source, a heat-transmitting curved reflector disposed behind the light source, a plurality of condensing lenses disposed in front of the light source, and a heat-reflecting filter disposed in front of the condensing lenses transmit light. The curved reflecting mirrors are arranged side by side with their axes aligned, and the central part of the curved reflecting mirrors is a spherical part, and the periphery of the spherical part is formed as an elliptical part having a smaller curvature than the spherical part, and the curved reflecting mirrors and the concentrator The condensing point of the light source that is condensed by the optical lens is aligned with the light receiving part of the light input end face of the optical fiber, and the heat ray reflecting filter is formed in a spherical shape centered on this condensing point, and the light beam is 1. A light source device for an optical fiber, characterized in that a plurality of heat dissipation fins are protruded from the circumferential surface of the light input end face of the fiber, and a cooling fan is disposed below the heat dissipation fins.