JP2548582Y2 - Condensing prism for optical fiber ring illumination - Google Patents

Description

[Detailed description of the invention] [Industrial applications]

The present invention relates to a condensing prism for an optical fiber ring illumination for condensing light from a light emitting portion of the optical fiber ring illumination.

[Prior art]

The optical fiber ring illumination is used for illumination of a sensor or the like. FIG. 4 shows an example of the optical fiber ring illumination. Referring to FIG.
A ring light emitting portion 2 formed by fixing one end face of a plurality of optical fibers 3 in a ring shape and an incident end portion 4 having the other end of the optical fiber 3 converged and opposed to a light source 5; Consists of The optical fiber ring-shaped illumination 1 guides light from a light source 5 and emits light from a ring light emission unit 2.

[Problems to be solved by the invention]

However, as shown in FIG. 5, when the distance between the ring light emitting portion and the illuminated portion is short, as shown in FIG.
There is an inconvenience that it becomes a complete ring light and cannot illuminate the illumination location uniformly. To solve this, there is a method of replacing the optical fiber ring-shaped illumination with a type having a small ring diameter. However, the replacement is troublesome, and it is necessary to prepare ring illuminations of various diameters. The present invention provides a converging prism for an optical fiber ring-shaped illumination, which is attached to an emitting portion of an optical fiber ring-shaped illumination and changes the illumination position to condense light from the ring light emitting end. is there.

[Means for Solving the Problems]

The condensing prism for optical fiber ring-shaped illumination of the present invention is:
The following problems are solved by the following configuration. That is, the converging prism for optical fiber ring-shaped illumination of the present invention includes an axis aligning section having a removably attachable projection formed in the central cavity of the optical fiber ring-shaped illumination device, and the axial aligning section. A light incident surface having a ring shape in contact with a light emitting portion of the optical fiber ring-shaped illumination device while being inserted into the central hollow portion, and light incident from the light incident surface is condensed in a ring central axis direction. And a light-collecting portion having a light-collecting surface.

[Action]

The condensing prism for optical fiber ring-shaped illumination of the present invention is:
The light incident surface comes into contact with the ring light emitting portion of the optical fiber ring-shaped illumination, and almost all of the light from the optical fiber ring-shaped illumination is incident, and the light is condensed on the central axis of the ring at the condensing portion.

【Example】

FIG. 1 is a perspective view of an optical fiber ring-shaped illumination condenser prism according to the present invention. The optical fiber ring-shaped illumination condenser prism 6 includes an axis aligning unit 9, a light incident surface 7, and a condenser unit 8. The axis aligning unit 9 is inserted into the central cavity of the optical fiber ring illumination to axially align the optical fiber ring illumination condenser prism. A male screw portion may be formed on the outside of the shaft aligning portion 9, and a female screw portion may be formed in the central cavity of the optical fiber ring-shaped illumination in the same manner. The light incident surface 7 comes into contact with the light emitting portion of the optical fiber ring illumination and enters the emitted light in a state where the axis aligning portion 9 described above is inserted into the central cavity of the optical fiber ring illumination. The light incident surface 7 is formed by the axis aligning portion 9.
The optical fiber ring-shaped illumination is aligned and joined without shifting from the light incident surface. The light condensing part 8 has a light condensing surface 10 formed on a side surface thereof for condensing light incident from the light incident surface 7 in the ring center direction and emitting the light. Therefore, the light-collecting surface 10 of the light-collecting unit 8 is inclined toward the center, and emits the collected light from this side surface. The shape of the light-collecting surface of the light-collecting portion may be a curved surface as shown in FIG. 3B instead of a linear change as shown in FIG. The inclination angle when the light-collecting surface is linear, the curvature when the light-collecting surface is curved, and the like may be appropriately designed in accordance with the distance at which light emitted from the light-collecting surface is collected. The optical fiber ring-shaped illumination condenser prism shown in FIGS. 1 and 3 (a) and 3 (b) has a hollow inside, but does not have to be hollow. Next, the function of the optical fiber ring-shaped illumination condenser prism of the present invention will be described. The condensing prism for optical fiber ring-shaped illumination of the present invention is:
The axis aligning portion 9 is inserted into the central cavity of the optical fiber ring illumination as shown in FIG. 2, and the light emitting end of the optical fiber ring illumination and the light incident surface of the prism are joined. In this state, when light is emitted from the light emitting end of the optical fiber ring illumination, the light is incident on the light incident surface of the optical fiber ring illumination condensing prism and is condensed by the light condensing part (see FIG. 2). ) Is emitted.

【effect】

The condensing prism for optical fiber ring-shaped illumination of the present invention is:
In addition to being able to collect and illuminate the light from the light emitting part even at a short distance from the optical fiber ring illumination, various types of optical fiber rings can be used according to the illumination distance because the axis alignment part is detachable. If the prismatic illumination prism is replaced, the illumination application is expanded, and the effect is great.

[Brief description of the drawings]

FIG. 1 is an external view of an optical fiber ring-shaped illumination condensing prism, FIG. 2 is an external view of an optical fiber ring-shaped illumination condensing prism attached to the optical fiber ring-shaped illumination, and FIG.
FIG. 4 is a sectional view of a converging prism for an optical fiber ring illumination, FIG. 4 is an external view of the optical fiber ring illumination, FIG.
FIG. 1 is a perspective view for explaining an illumination pattern of a conventional optical fiber ring illumination. DESCRIPTION OF SYMBOLS 1 ... Optical fiber ring-shaped illumination device, 2 ... Ring light output part, 3 ... Optical fiber, 4 ... Input end part, 5 ... Light source, 6 ... Optical fiber ring-shaped illumination condensing prism, 7 ... Light incidence surface,
8: Condensing part, 9: Axis alignment part, 10: Condensing surface,

Claims (1)

(57) [Scope of request for utility model registration] A converging prism for an optical fiber ring illumination device for condensing light emitted from an optical fiber ring illumination device on a central axis of the ring, the optical fiber ring illumination device being detachably attached to a central cavity of the optical fiber ring illumination device. A shaft-aligning portion having a protrudable portion formed thereon, and a light-incident surface having a ring shape formed in contact with a light-emitting portion of the optical fiber ring-shaped illumination device in a state where the shaft-aligning portion is inserted into the central cavity. A light condensing portion having a light condensing surface for converging light incident from the light incident surface in the ring central axis direction.