JPS6298309A - Optical fiber projection device - Google Patents

Abstract

PURPOSE:To prevent a positioning component from deteriorating owing to reflected light from a mask and an optical fiber end surface from deteriorating secondarily by forming the positioning component so that its front end surface has nearly the same diameter with the projection end surface of an optical fiber and also forming a truncated conic shape which increases in diameter gradually from the tip position to the base end side. CONSTITUTION:Laser light 8 projected from the projection end surface 1c of the optical fiber is collimated by a collimator lens 9 into parallel light; and part of it is transmitted through the mask 5 and the remainder is reflected. The reflected light 6 traveling to a lens 9 is passed through the lens 9 and travels to nearby the projection end surface 1c again. The front end surface 3a of the positioning component 3, however, is formed to almost the same diameter with the projection end surface 1b of the fiber 1 and the component is formed in the truncated conic shape, so the reflected light 6 is never converged on the front end surface 3a and scattered by being reflected repeatedly between the outer peripheral surface 3b and the wall surface of a mount hole 7a. therefore, the component 3 is prevented from deteriorating owing to the reflected light 6 and the end surface of the optical fiber 1 is prevented from deteriorating secondarily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber emitting device in which reflected light from a metal mask, a glass mask, etc. is focused near the fiber emitting end face.

[Conventional technology]

Conventionally, carbon dioxide laser or Nd:YA was used to stamp manufacturing dates and loft numbers on circuit parts molded with plastic materials or dyes, such as ICs and resistor arrays.
A G laser is used. In particular, in the latter case, it is possible to use a silica-based optical fiber, which is lightweight, flexible, and easy to operate, and is the same as that used for communications. In the output optical section of this type of optical fiber transmission line, the end face of the positioning part and the end face of the optical fiber are on the same plane, and a soft material such as Teflon is used for the end face of the positioning part.

[Problem that the invention seeks to solve]

By the way, in the conventional optical fiber emitting device configured as described above, collimated light is incident on a metal mask with stamped characters cut out or a gas mask in which a material having a high reflectance is deposited on parts other than the stamped characters. In this case, reflected light from the metal part or the high reflectance part is focused near the end face of the optical fiber. As a result, the positioning parts are processed and deteriorated, and the workpiece adheres to the end face of the optical fiber, causing heat absorption, causing deterioration of the fiber end face, and making the optical fiber unusable. .

The object of the present invention was made in view of the above-mentioned drawbacks, and it is aimed at reducing the deterioration of positioning components due to light reflected from the mask, and
Another object of the present invention is to provide an optical fiber emitting device that can prevent the end face of an optical fiber from deteriorating.

[Means for solving problems]

In the optical fiber emitting device of the present invention, the positioning component is formed so that its distal end surface has approximately the same diameter as the emitting end surface of the optical fiber, and has a truncated conical shape whose diameter gradually increases from the distal end position toward the proximal end. With this structure, it is intended to achieve the above-mentioned object.

[Example] The present invention will be described in detail below using examples shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of an optical fiber emitting device according to the present invention. A fiber fixing component 2 is attached to the outer circumferential portion of the optical fine \1, and a male screw is threaded onto the outer circumferential surface of the small diameter portion 2a of this fiber fixing component 2. The male screw of the small diameter part 2a of the fiber fixing component 2 is screwed into the male screw threaded on the inner wall surface on the proximal side of the positioning component 3, whereby the positioning component 3 is fixedly attached to the fiber fixing component 2. It is now possible to do so.

The positioning component 3 is provided with a fiber hole 4 along its axis, and the optical fiber 1 is inserted and fixed into the fiber hole 4. To explain this in more detail, the fiber hole 4 consists of a small-diameter hole 4a and a large-diameter hole 4b whose diameter is somewhat larger than the small-diameter hole 4a, and the core and cladding portion 1a of the optical fiber 1 are inserted into the small-diameter hole 4a. At the same time, there is a coating portion 1b of the optical fiber 1 in the large diameter hole 4b.
The part that includes is inserted. Further, the output end face IC of the optical fiber 1 and the distal end face 3a of the positioning component 3 are located on the same plane, and the output end face IC of the optical fiber 1 and the distal end face 3a of the positioning component 3 have approximately the same diameter. It is formed so that Therefore, when the optical fiber 1 and the positioning part 3 are viewed from the direction of the arrow in FIG. As shown in FIG. 2, the reflected light 6 from the mask 5 is not focused on the distal end surface 3a of the positioning component 3, but hits the wall surface of the mounting hole 7a of the envelope 7 or the outer peripheral surface 3b of the positioning component 3. I will come into contact with you. The proximal end of the positioning component 3 is fixed to the bottom of the mounting hole 7a of the envelope 7 via the fiber fixing component 2, and the positioning component 3 is fixed to the envelope 7. In this state, the optical fiber 1 located on the axis of the positioning component 3
is arranged to coincide with the center line of the envelope 7. Further, the positioning component 3 has a diameter that gradually increases from its distal end toward its base end, and is formed to have a truncated conical appearance.

Further, the mounting hole 7a of the envelope 7 is formed so that its diameter gradually decreases from the open end side toward the bottom side.

Therefore, the cross-sectional shape formed by the optical fiber 1, the positioning component 3, and the envelope element has a horizontal rWJ shape, as shown in FIGS. 1 and 2.

Therefore, in the optical fiber emitting device configured as above, as shown in FIG. 2, the laser beam 8 emitted from the emitting end face IC of the optical fiber 1 with a certain aperture angle is
First, the collimating lens 9 converts the light into parallel light and the light is incident on the mask 5 . Part of the collimated light passes through the mask 5, and the other part is reflected by the mask 5.

Of the reflected lights, the reflected light 6 heading towards the collimating lens 9 side returns to the vicinity of the output end face IC of the optical fiber 1 after passing through the collimating lens 9, as shown by reference numeral 6'. However, since the distal end surface 3a of the positioning component 3 is formed to have approximately the same diameter as the output end surface 1b of the optical fiber 1, and the positioning component 3 is formed into a truncated conical shape as described above, the reflected light 6 is positioning part 3
The light is not focused on the distal end surface 3a of the lens, but is scattered by multiple reflections between the outer circumferential surface 3b of the positioning component 3 and the wall surface of the mounting hole 7a of the envelope 7.

Therefore, it is possible to prevent deterioration of the positioning component 3 due to the reflected light 6 and secondary deterioration of the first end face of the optical fiber.

In addition, in the embodiment described above, the mounting hole 7a of the envelope 7
The mounting hole is formed so that the diameter gradually decreases from the open end side toward the bottom side, but the structure is not limited to this. The hole shape may be as follows. In short, it is only necessary that the positioning component 3 is shaped like a truncated cone as described above.

〔Effect of the invention〕

As explained above, according to the optical fiber emitting device according to the present invention, the positioning component is formed so that its distal end surface has approximately the same diameter as the emitting end surface of the optical fiber, and the positioning component is formed gradually from the distal end position toward the proximal end side. Since it is formed into a truncated conical shape with an expanding diameter, it is possible to reliably prevent the deterioration of the positioning component due to reflected light from the mask and secondary deterioration of the end face of the optical fiber. have

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of an optical fiber emitting device according to the present invention, and FIG. 2 is an explanatory view showing the operation of the optical fiber emitting device. I...Optical fiber, IC...Emission end surface, 3...Positioning component, 3a...Tip surface, 7...Outer enclosure 7a... Mounting hole. Applicant: NEC Corporation

Claims (1)

[Claims] 1. An envelope provided with a mounting hole, an optical fiber is held and fixed along the axis, and the distal end surface is located on the same plane as the output end surface of the optical fiber, and the optical fiber is and a positioning component whose proximal end is fixed to the bottom of the mounting hole of the envelope so as to be on the center line of the envelope, and the positioning component has a distal end surface that is aligned with the output end surface of the optical fiber. What is claimed is: 1. An optical fiber emitting device characterized in that it is formed in a truncated conical shape, the diameter of which is approximately the same as that of the distal end, and whose diameter gradually increases from the distal end toward the proximal end. 2. The optical fiber emitting device according to claim 1, wherein the mounting hole of the envelope is formed so that its diameter gradually decreases from the open end side toward the bottom side.