JPS6010561Y2 - Endoscope with multiple observation optical systems - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an endoscope having a plurality of observation optical systems.

Examples of conventional endoscopes include:

■ A direct view type with an observation window on the front of the tip to allow you to observe the front.

■ A side-viewing type with an observation window on the side of the tip for viewing from the side.

■ A movable prism is installed at the tip, which works in conjunction with the objective lens, and the viewing direction can be changed by operating a wire from the main body of the operating unit.

The above methods (1) and (2) are inconvenient because the viewing direction is limited to only one direction, and (2) has the following disadvantages.

In other words, since a movable prism is placed at the tip, there are problems with accuracy and reliability, and since a long wire is used to drive the prism, response is poor, and furthermore, the space at the tip is limited. Since a movable prism and the like are included in the lens, it is impossible to add a zoom lens system thereon, which poses design problems.

The present invention provides a plurality of observation optical systems and a switching means on the main body of the operating section (thereby, the observation optical system can be fixedly arranged at the tip), thereby solving the above-mentioned problems in the conventional system. It is an object of the present invention to provide an endoscope having a plurality of observation optical systems that are completely eliminated.

The present invention will be specifically explained below with reference to embodiments shown in FIGS. 1 to 6.

In each figure, members having common functions are indicated by the same reference numerals.

FIG. 1 shows the structure of the distal end of an endoscope embodying the present invention.

That is, on the front surface of the tip 1, there is an observation window 2 for direct viewing.
An illumination window 3 is provided, and an optical fiber bundle 5 for direct viewing is connected to the observation window 2 via an objective lens system 4 for direct viewing.

Further, an optical fiber bundle 6 for direct viewing illumination is connected to the illumination window 3, and this optical fiber bundle 6 is branched from a flexible tube (not shown) of the endoscope and installed outside. It is connected to a light source device (not shown).

An observation window 7 for side viewing and an illumination window 8 are provided on the outer periphery of the tip 1. The observation window 7 is provided with an optical system for side viewing via a prism 9 and an objective lens 10 for side viewing. Fiber bundles 11 are arranged in series.

Further, an optical fiber bundle 12 for side view illumination is connected to the illumination window 8, and this optical fiber bundle 12 is connected to the optical fiber bundle 6 for side view illumination.
Similarly, it is branched from the flexible tube of the endoscope and connected to the light source device.

FIG. 2 shows the operating unit main body 13 of the endoscope tip 1 shown in FIG. 1, and the eyepiece side end of the optical fiber bundle 5 for direct viewing observation and the optical fiber bundle 11 for side viewing observation A disc-shaped switching member 14 is fixed to the main body 13 so as to be rotatable in a rotation guide groove 13a provided in the main body 13 of the operating part.

The switching member 14 rotates the handle 14a along the waist groove 13a in a direction across the operating section main body 13, and connects one of the end portions of the optical fiber bundles 5, 11 on the eyepiece side to the operating section main body 13. It selectively faces the eyepiece system 15 provided inside.

The eyepiece system 15 is provided at the end of the operation unit main body 13.
A throttle member 16 having a throttle hole 16a and an operating section main body 13
Prisms 18, 19, eyepieces 20, 21, and observation window 2 are arranged in order from the left in a lens barrel 17 fixed at the end of the
When one of the observation optical fiber bundles 5 and 11 faces the aperture hole 16a, the prisms 18 and 19 direct some of the light emitted from the end face of the observation optical fiber bundles 5 and 11 to the prism 18.
into the photoelectric conversion element 23 provided at the bottom of the
It is directed to an observation window 22 through an eyepiece 20.21.

FIG. 3 shows an example in which a relay lens system 24.25 is used in place of the observation optical fiber bundles 5, 11. In this case, the relay lens system 24.25 is As shown in the figure, the end on the eyepiece side is fixed to the end wall 13b inside the operating section main body 13, and instead of the lens barrel 1 of the eyepiece lens system 15.
5b is fixed to a disc-shaped switching member 14, and is switched by this switching member 14.

Note that in this case, the aperture member 16 is fixed to the lens barrel 15b.

In the present invention, an optical fiber bundle or a relay lens system can be used as the image transmission system of the observation optical system, and the configuration of the switching means can be changed depending on the structure.

FIG. 5 shows that when the eyepiece system 15 is to be switched, the optical axes of the prisms 18 and 19 and the eyepieces 20 and 21 are positioned at the center of the lens barrel 15b and the operating section main body 13; Prism 26. is attached to the side of prism 19.
27 is arranged, and the incident light passing through the aperture hole 16a is introduced into the prism 18.19 by both prisms 26.27.

In this way, the eyepiece window 22 is always connected to the operation section main body 13.
It has the advantage that it can be located in the center of the end face of the

Further, FIG. 6 shows a case where a sliding switching member 28 is used in place of the disc-shaped switching member 14.

That is, a sliding guide groove 13c is provided on the inner wall of the end portion of the operation section main body 13, and the switching member 28 is moved along this groove 13c.
By pushing and pulling the handle 28a, either one of the optical fiber bundles 5 and 11, the end of which is fixed to the switching member 28, is selectively inserted into the aperture hole 16a. It is now possible to face each other.

As described above, according to the present invention, a plurality of observation optical systems are fixedly provided at the distal end, and are selectively connected to the eyepiece system by switching operations at the operation unit main body. For example, observation on both sides of the image can be performed accurately and easily by operating only the main body of the operation unit, and even if the optical system at the tip is made considerably complex, there will be no problem in changing the observation direction. No.

In addition, in this invention, in addition to the switching member 14, 28, etc.
The configuration other than the parts related to the gist of the present invention can be freely modified according to conventional techniques.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of the distal end of an endoscope having a plurality of observation optical systems, showing an embodiment of the present invention, and FIG. 2 is a main body of the operating section of the endoscope shown in FIG. 1. 3 is a side sectional view of the distal end of an endoscope having a plurality of observation optical systems, showing another embodiment of the present invention, and FIG. 4 is a side sectional view of the distal end of the endoscope shown in FIG. 5 and 6 are side sectional views of the operating section main body of an endoscope having a plurality of observation optical systems, respectively showing another embodiment of the present invention. It is. 5.11, 24, 25... Image transmission system in multiple observation optical systems, 15... Eyepiece system, 14
゜28...Switching member constituting the switching means.

Claims (1)

[Scope of utility model registration request] Consisting of a plurality of observation optical systems each having a different observation direction and an independent objective lens system, and a single eyepiece lens system, one of the eyepiece-side ends of the plurality of observation optical systems is placed on the operation unit main body side. 1. An endoscope, characterized in that the endoscope is selectively connected to the eyepiece system optically by means of a switching means provided therein.