Optical waveguides – Optical fiber bundle – Fiber bundle plate
Patent
1996-02-01
1998-01-13
Palmer, Phan T. H.
Optical waveguides
Optical fiber bundle
Fiber bundle plate
385115, 385901, 362 32, G02B 604
Patent
active
057087482
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a target device for a laser and more particularly a target device for a laser equipped with a plurality of fiber members and capable of improving visibility in a light place by using at least one surface as a diffusing surface.
BACKGROUND ART
Generally, in an installing work for sewer pipes or the like, the ground is dug down and hollow pipes, etc. are installed. Since liquids such as city water and sewage are flowed down through such hollow pipes, it is necessary that the hollow pipes be inclined to an appropriate extent. In particular, when the hollow pipes bend vertically and meander right and left in intermediate positions, there has been a fear that the contents flowing down through the pipes may stay and block the pipe or lead out into the ground.
Therefore, in installing such pipes, it has so far been necessary to measure the installing pipe depth at every certain distance and provide an appropriate reference line so as to dig down the ground to predetermined depths.
Reference will now be made to a concrete method for execution. First, laser light is radiated as guide between certain straight lines and with the laser light as a reference there is installed a general, temporary base. On the temporary base thus installed are then put pipes so as to be coincident with each other with respect to direction, inclination and the inner lower surfaces. Thereafter, the dug portion of the ground is filled up and now the work is over.
In the above work, laser light is effective in positioning the pipes; besides, unlike yarn, laser light does not become loose even over a long distance, nor does it interfere with the work. Further, there is no fear of laser light being broken by interference with the pipes, etc. during the work.
As mentioned above, in the case where the pipe laying work is carried out using laser light as guide, the laser light is passed through the center of the pipe. For effecting alignment of the laser light and the pipes there are used various targets.
For example, as shown in FIG. 7, a target device is composed of a target plate 10000 and target bases 20000 and 20100 for resting the target plate 10000 thereon. The target plate 10000 is for receiving laser light and is constructed so as to diffuse the laser light upon incidence of the light. Laser light has directivity and is extremely difficult to be seen with the eyes, but once diffused, it becomes visible easily to the worker.
When a pipe laid position is to be checked by using such a target device and in the case of laying the first pipe, the pipe position can be observed from the laser oscillator side, but usually in most cases the laser light passing diffusedly through the target device mounted at a pipe end portion is observed.
As the material of the target plate 10000, therefore, there is used an opaque material which not only diffuses but also somewhat transmits laser light.
In most cases, however, a pipe laying work, especially a work of burying pipes of a small diameter into the ground, is performed in the light daytime. In this connection, with the target plate 10000 of the conventional target device, as shown in FIG. 8, it is possible to check the pipe from any position because of uniform diffusion of light, but there arises the problem that in a light place it is difficult to check the pipe.
DISCLOSURE OF THE INVENTION
The present invention comprises a target device for a beam of laser light having an axis of propagation, comprising a row of substantially parallel elongated optical members, each optical member having an axis of elongation and an outer surface shaped to refract light in a direction generally perpendicular to the axis of elongation, and the axis of elongation being transverse to the axis of propagation of the beam of laser light, whereby the beam of laser light, on passing through one or more optical members, is expanded in a direction generally perpendicular to both the axis of elongation and the axis of propagation.
Moreover, the present invention comprises
REFERENCES:
patent: 4141058 (1979-02-01), Mizohata et al.
Hayashi Kunihiro
Ohtomo Fumio
Kabushiki Kaisha Topcon
Palmer Phan T. H.
LandOfFree
Target device for a laser does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Target device for a laser, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Target device for a laser will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-332405