JPH0432852Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an underwater observation device, and more specifically, to an improvement of an underwater observation device used for optical observation underwater or in the ocean.

[Conventional technology]

Conventionally, unmanned underwater survey equipment has been used to house an imaging device such as a television camera in a transparent watertight container, to submerge it into the target water, and to observe the underwater conditions by remote control from the ground. There is.

These underwater survey devices include, for example,
As disclosed in No. 54-137227 or No. 57-130892, a camera is placed in a watertight container, a mirror with a variable reflection angle is placed on the optical axis of this camera, and an image is captured through a transparent window. It is proposed to widen the scope.

According to this configuration, there is no need to directly move the optical axis of the camera, so there is an advantage that the entire underwater observation device can be made more compact.

[Problems with conventional technology]

However, since imaging is performed through a transparent cylindrical peripheral wall, there is a problem that a lens effect occurs in the horizontal axis direction and the image is distorted, making it unsuitable for precision measurement.

However, this problem can be solved by using a flat transparent window as the peripheral wall through which the optical axis passes, but the imaging target is limited to the direction opposite to this flat transparent window, and 360° observation is not possible. In this case, it is necessary to rotate the entire device including the cylindrical container around the cylindrical axis, which poses a problem in that a large amount of incidental equipment is required.

[Problems solved by invention]

In view of the above-mentioned problems, this idea was developed to enable underwater observation in which there is no image distortion even though images are taken through the peripheral wall of a cylindrical transparent container, and furthermore, it is possible to take images in all directions while keeping the underwater posture constant. This was done for the purpose of providing equipment.

[Technology to solve problems]

That is, in the underwater observation device of this invention, the observation device is arranged in a transparent cylindrical watertight container with the center axis of the container as the optical axis, and the observation device is arranged in the direction of the circumferential wall of the cylindrical watertight container on the extension of the optical axis. The device is characterized in that a mirror is provided to reflect the optical axis, and a one-dimensional concave lens for correcting biased distortion is provided on the optical axis inside the cylindrical container.

〔Example〕

Next, this invention will be explained using examples.

FIG. 1 is a sectional view of a main part of an embodiment of this invention, and FIG. 2 is a view taken along the - line in FIG. 1.

The underwater observation device 1 of this invention is placed in a transparent cylindrical watertight container 2, with the center axis 2C of the container 2 being set as the optical axis L.
An observation device 3, for example, a TV camera, etc. is arranged as an observation device 3, and a reflecting mirror 4 is provided on the extension of this optical axis L to bend the optical axis L toward the circumferential wall 2A of the cylindrical watertight container. A one-dimensional concave lens 5 for correcting biased distortion is provided on the optical axis L of the lens.

The one-dimensional concave lens 5 for correcting biased distortion is arranged along the peripheral wall 2A as shown in the figure, and also along the mirror 4 and the observation device 3 as shown in FIG.
(TV camera).

In the case of the configuration shown in FIG. 3, the unitary concave lens 5 can be small because it is close to the convergence part of the incident light beam.

Further, in the above embodiment, if the mirror 4 is made tiltable about the pivot point 4A, the visible range can be widened.

Further, in this case, it is convenient if the tailing mirror 4 can be tilted out of the optical axis L as shown in FIG. 4, since this increases the number of directions in which images can be taken.

Further, the mirror 4 and the correction concave lens 5 in FIG. 1 may be rotatable about the central axis 1C while maintaining their mutual optical axis relationship, and furthermore, they may be rotatable together with the observation device 3. It's okay.

In this case, the configuration is such that the remote control signal line 3A and the like are connected by a slip ring (not shown).

[Effect]

When performing underwater observation using the underwater observation device 1 of this invention, the underwater observation device 1 is lowered into the water and stopped at an arbitrary position, and then the observation is performed by remote control.

Observation is performed through the peripheral wall 2A of the transparent watertight container 2 through the mirror 4, but at this time, the optical axis L
Image distortion is corrected by a one-dimensional concave lens 5 for correcting partial distortion located above.

Note that the mirror 4 and the concave lens 5 are aligned with the central axis 2.
If the observation device 3 is made rotatable around center C, it will be possible to observe the peripheral wall of the cylindrical container 2 in all 360° directions while the observation device 3 is fixed, and if the observation device 3 is also made rotatable, it will be possible to observe the same direction as the actual movement direction. The image is obtained,
It becomes possible to observe the entire surrounding area using a tangible image.

〔effect〕

This effect is structured as above, so
Even if the image is obtained through a transparent cylindrical wall, distortion is corrected and precise observation becomes possible.

In addition, by making the mirror a tail type, the observation range becomes wider, and by making it possible to rotate around the central axis of the watertight container, it becomes possible to observe all the surroundings, and the entire underwater observation device can be made compact, which changes the balance. It also has the effect of reducing

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of this invention, Fig. 2 is a view taken along the - line in Fig. 1, Fig. 3 is a sectional view of another embodiment, and Fig. 4 is a sectional view of yet another embodiment. It is a diagram.

Claims (1)

[Claims for Utility Model Registration] (1) An observation device is arranged in a transparent cylindrical watertight container with the central axis of the container as the optical axis, and the circumferential wall of the cylindrical watertight container is located on the extension of the optical axis. 1. An underwater observation device comprising: a mirror that reflects an optical axis in a direction; and a unidirectional concave lens for correcting biased distortion is provided on the optical axis within a cylindrical container. (2) Claim 1 of the utility model registration claim states that the mirror and the bias correction lens are rotatable about the central axis of the cylindrical watertight container while maintaining mutual visibility and optical axis relationship. underwater observation equipment.