JPH01250907A - Light guide fiber unit and light irradiating device using said unit - Google Patents

Abstract

PURPOSE:To make the diameter of a lens small, and also, to thin its wall thickness and to make it small in size by placing a projection lens for bringing an emitted light from an optical fiber bundle to image formation in a lens barrel and providing a convex lens between the projection lens and the emitting end of the optical fiber bundle. CONSTITUTION:In a lens barrel 23, between the emitting end of a bundle 22d and projection lenses 23b-23d, a convex lens 23a is provided in the vicinity of the emitting end of the bundle 22d, and a luminous flux radiated from a metallic fixture 22c of the emitting end part is collected in the optical axis direction. In such a way, the effective diameter which the luminous flux transmits through can be made small, therefore, the diameter of the wall thickness of the projection lenses 23b-23d can be made small, and as a result, the diameter of the lens barrel 23 can be made small.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a light guide fiber unit that guides emitted light from a short-arc discharge lamp or the like to an irradiated object, and a light guide fiber unit that guides radiation light from a short-arc discharge lamp or the like to an irradiated object. This invention relates to a light irradiation device that processes objects with light.

[Prior Art] Light irradiation is used to harden adhesives, paints, inks, resists, etc., or conversely melt or soften them, and various other treatments are performed. The objects to be irradiated, such as adhesives, paints, inks, and resists, are
For example, an object to be irradiated is subjected to light irradiation treatment using light from a short-arc discharge lamp such as a xenon lamp or an ultra-high pressure mercury lamp.

In light irradiation processing, there are cases where it is necessary to irradiate light onto a minute area, such as when bonding a CD pickup lens or temporarily fixing electronic components to a board. A device is known that guides light from the above-mentioned short arc type discharge lamp and irradiates the light.

Fig. 2 is a schematic explanatory diagram of a light irradiation device using a conventional light guide fiber, in which 1 is a short-arc discharge lamp (hereinafter referred to as a lamp), 2 is an elliptical condensing mirror, and its first focus is The arc of the lamp l has a certain positional relationship. 4 is a shutter provided on the optical path from the elliptical condensing mirror 2; 5 is a light guide fiber for guiding the light from the lamp l to the object to be irradiated; and 5a is the entrance part of this light guide fiber. Further, a lens barrel 9 is provided at the tip of the light guide fiber 5 on the output side, and a projection lens 8 is mounted within this lens barrel 9. 10 is a lamp body, 11 is this lamp l
In the column O, 12 is a support part to which the lamp body 10 and the column 11 are attached.

In the device shown in FIG. 2, the entrance part 5a of the light guide fiber 5 is installed so as to be located at the second focal point of the elliptical condenser mirror 2, and the light from the lamp l that has entered this entrance part 5a is placed in the light guide fiber. 5 and exits from the tip on the exit side, or is condensed again by a projection lens 8 provided on the exit side and is irradiated onto an object to be irradiated.

[Problem to be solved by the invention] In the conventional device as described above, in order for the projection lens provided on the output side of the light guide fiber to condense all the light emitted from the light guide fiber and form an image. The longer the distance from the lens to the projection surface, the larger the diameter and thickness had to be. Therefore, using a light guide fiber has the advantage of being able to freely guide and irradiate light even in a narrow space, but if the distance from the lens to the projection surface is long, the lens unit becomes large and the advantage of leverage cannot be utilized.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a light guide fiber unit equipped with a projection lens that allows the diameter of the lens to be reduced and the wall thickness to be reduced.

[Means for Solving the Problems] In order to achieve the above object, the light guide fiber unit of the present invention is provided with a lens barrel constituting a lens unit on the output side, and an optical fiber serving as a light guiding means is provided in the lens barrel. At least one projection lens is arranged to image the light emitted from the fiber bundle, and a convex lens is provided between the projection lens and the output end of the optical fiber bundle.

[Function] By having the above configuration, the lens unit can be made small, and it is possible to irradiate light even to an irradiated object placed in a narrow place.

[Example] FIG. 1(a) shows a light guy 1 which is an example of the present invention.
(b) is an overview of the light guide fiber unit in (a), and (C) is a schematic diagram of the light guide fiber unit in (b). This is a detailed view of the output side of the light guide fiber unit, where 3 is a plane reflector that reflects the light from the elliptical collector mirror 2, 13 is a ventilation hole with a fan, 20 is a lamp body, and 21 is a unit junction. 21a is a mounting screw, 22 is a light guide fiber unit, 22a is a fiber input end fitting, 2
2b is a flexible tube, 22c is an output end fitting, 22d is an optical fiber bundle (hereinafter referred to as a handle), 23 is a lens barrel, 23b,
Reference numerals 23c and 23d designate a projection lens that forms an image of the light emitted from the handle 22d onto an object to be irradiated, and 23a represents a convex lens that collects or bends the emitted light flux from the handle 22d in the optical axis direction and makes it enter the projection lens. Further, the same reference numerals as in FIG. 2 indicate the same or corresponding parts.

In FIGS. 1(a), (b), and (c), light from a lamp 1 is focused by an elliptical condenser mirror 2, and is positioned at the second focal point of the elliptical condenser mirror 2 via a flat reflector 3. The light is focused on the tip of the handle 22d. After that, the lens barrel 2 passes through the bundle 22d.
The light passes through the projection lenses 23b, 23c, and 23d in the bundle 22d, and projects the output end of the bundle 22d onto the object to be irradiated. Projection lenses 23b, 23c, and 23d each consisting of three convex lenses are provided within this lens barrel 23 to project the light emitted from the bundle 22d onto an object to be irradiated. At this time, the light emitted from the output end of the bundle 22d is emitted with the maximum angle approximately equal to the maximum angle at which it enters the input end of the fiber, so in order to collect all of this expanding emitted light without wasting it, a projection lens is used. 23b, 23c
, 23d must be increased, and the thickness of each projection lens 23b, 23c, 23d will also be increased accordingly. Therefore, the lens barrel that accommodates these projection lenses needs to be quite large in size.

Therefore, in this embodiment, a convex lens 23 is provided between the output end of the handle 22d and the projection lenses 23b, 23c, and 23d.
a is provided close to the output end of the handle 22d to collect the luminous flux emitted from the output end fitting 22C in the optical axis direction. As a result, the effective diameter through which the light beam passes can be reduced, and the diameter and wall thickness of the projection lenses 23b, 23c, and 23d can be reduced, and as a result, the diameter of the lens barrel 23 can also be reduced. . The effect of the present invention will be greater if the convex lens 23a is placed as close to the output end of the handle 22d as possible, and the effect of the present invention can be obtained if the lens barrel 23 is made smaller or if it is placed between the output end and the projection lens.

This light guide fiber unit 22 can be installed by replacing it with another light guide fiber unit at the unit joint 21 as appropriate, so that it can be attached to a light guide fiber unit with a different handle shape, a lens unit with a different shape, etc. It can be installed freely according to the dimensions. Further, the output end fitting 22c includes a handle 22d and a flexible tube 22.
b and the lens barrel 23, the output end fitting 22
It is preferable to connect different types of lens units to c for exchange.

Note that since the lamp body 20 is heated by the radiation from the lamp l, a ventilation hole 13 equipped with a fan is provided to ventilate the lamp body 20.
Or is provided.

[Effects of the Invention] As explained above, the present invention provides a lens barrel constituting a lens unit on the output side, and arranges within this lens barrel at least one projection lens that projects the light emitted from the optical fiber bundle. However, since it has a configuration in which a convex lens is provided between the projection lens and the output end of the optical fiber bundle, it is small and easy to operate.
Kiriko is ideal as a fiber light source that requires light irradiation treatment in narrow spaces.

[Brief explanation of the drawing]

FIG. 1(a) is a diagram schematically showing the main parts of a light irradiation device using a light guide unit which is an embodiment of the present invention;
Figure 2 (b) is an overview of the light guide fiber unit in Figure (a), Figure (C) is a detailed view of the output side of the light guide fiber unit in Figure (b), and Figure 2 is FIG. 2 is a schematic explanatory diagram of a light irradiation device using a conventional light guide fiber. In the figure. 1 lamp 2 elliptical condensing mirror 3: plane reflecting mirror 21: unit joint 22, light guide fiber unit 22a: fiber input end fitting 22b, flexible tube 22c/output end fitting 23: lens barrel 23a: convex lens 23b, 23c, 23d: Projection lens agent Patent attorney 1) Haru Kitatake

Claims (2)

[Claims] (1) In a light guide fiber unit consisting of an optical fiber bundle serving as a light guiding means, a lens barrel constituting a lens unit is provided on the exit side, and the light emitted from the optical fiber bundle is formed into an image within this lens barrel. A light guide fiber unit characterized in that at least one projection lens is arranged, and a convex lens is provided between the projection lens and the output end of an optical fiber bundle. (2) A lamp body housing a short-arc discharge lamp and an elliptical collector mirror for concentrating light from the discharge lamp, the lamp body having a light guide fiber according to claim (1). A light irradiation device characterized by joining or combining units.