JPH01253708A - Display device for endoscope - Google Patents

Abstract

PURPOSE:To prevent moire fringes from being formed by vibrating a synchronous vibrating means which is fitted to a side part nearby the incidence end and projection end of an internal optical fiber bundle so that a shift is made by a half the pitch of the array of optical fiber elements. CONSTITUTION:The optical fiber bundle 6 for observation which is formed by bundling many small-diameter optical fiber elements is put in the endoscope 1, an objective 7 is provided on the tip side of an insertion part 2, and an ocular lens 8 is provided on the rear end side of an ocular part 4; and a 1st ocular part 22 is provided behind it and connected to an optical fiber bundle 27. Piezoelectric elements 32 and 32 are mounted on the side part nearby the incidence end and projection end of the fiber bundle 27 and connected to a signal line 33. The element 32 vibrates with a driving signal which is generated by a vibration control part 18 and obtained through the endoscope 1 so that the array of the elements constituting the fiber bundle 27 shifts by 1/2 pitch from the array of the elements constituting the fiber bundle 6 to prevent meshes and moire fringes are formed in a light image obtained on the side of the ocular 28, so an image with good resolution is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscope viewing device that allows a plurality of observers to simultaneously observe through the same endoscope.

[Prior art and problems to be solved by the invention] Generally,
The endoscope viewing device connects the endoscope viewing device to the eyepiece on the endoscope side, and transmits a portion of the light of the observation light image transmitted by the observation optical fiber bundle on the endoscope side. is divided by a half mirror or the like, and a part of the light is focused on the entrance side end surface of the optical fiber bundle for viewing by an imaging lens, so that the optical image is introduced into the optical fiber bundle for viewing, and the light image is introduced into the optical fiber bundle for viewing at the other end. The optical image can be observed at the same time from the eyepiece section of the endoscope viewing device on the side. In order to form an optical image appearing on the eyepiece side end surface of the viewing optical fiber bundle onto the entrance side end surface of the viewing optical fiber bundle, the viewing optical fiber bundle is formed on the entrance side end surface of the viewing optical fiber bundle. The pattern on the end face of the bundle, that is, the arrangement pattern of a large number of small-diameter optical fiber Ift elements, is also incident imaged. There is no problem if the array pattern formed by the incident image completely overlaps with the array pattern on the incident side end face of the optical fiber bundle for viewing.
In reality, discrepancies almost always occur. For this reason, moiré fringes may appear in the observed image of the endoscopic viewing device, resulting in an unclear image with bright and dark areas.

Therefore, recently, in endoscopes equipped with endoscope viewing devices, observation optics that bundle a large number of thin optical fibers @ elements have been developed. f
By shifting the directionality of the arrangement pattern on the eyepiece side end surface of the bundle and the arrangement pattern on the entrance side end surface of the optical fiber bundle for viewing by a predetermined angle and optically coupling them, the moiré fringes can be generated. There is something designed to prevent this.

However, with this method, it is necessary to precisely control the directionality of the optical fiber bundle for observation and the optical fiber bundle for viewing on the endoscope side, and the A means must be adopted to securely fix the viewing device without shaking it. Therefore, the structure becomes complicated, requires a large number of man-hours, and becomes expensive. Furthermore, since the endoscope and the endoscope viewing device must be fixed together, when the endoscope is rotated, the endoscope viewing device must also be rotated at the same time. Therefore, the operability of the endoscope and the viewing device for an endoscope is significantly reduced. Also, each optical! Even if the end faces of the 1iIIIi bundles are fixed at angles that do not cause moiré fringes, moire fringes will still occur if the end faces of these optical fiber bundles are not arranged accurately and are bent or wavy. Furthermore, even if only those with an accurate arrangement were produced, the yield would be extremely low and the cost would be high.

The present invention has been made in view of the above circumstances, and is an endoscope viewing device that can prevent the occurrence of moire fringes without significantly reducing the operability of the endoscope and the endoscope viewing device. is intended to provide.

[Means and effects for solving the problem] In order to achieve the above object, the present invention provides eight points! The viewing device for a mirror is a synchronous device that is attached to the sides close to the input end and the output end of an optical fiber bundle built in the viewing device for an endoscope, and vibrates the input end and the output end of the optical fiber bundle synchronously. By providing a vibration means and vibrating the synchronous vibration means so as to shift the arrangement of the optical fiber elements by 1/2 pitch, the endoscope side optical 1
The mesh appearing on the eyepiece side end surface of one bundle is canceled out, thereby preventing the occurrence of moiré fringes on the eyepiece side end surface of the viewing optical fiber bundle.

[Embodiment] FIG. 1 is an explanatory diagram showing the configuration of an endoscope viewing device according to a first embodiment of the present invention.

As shown in FIG. 1, the endoscope 1 includes an elongated insertion section 2,
It is composed of an operating section 3 connected to the rear of the insertion section 2, and an eyepiece section 4 connected to the rear of the operating section 3.

Further, an optical fiber bundle 6 for observation, which is a bundle of a large number of small-diameter optical fiber elements, is housed inside the endoscope 11, and an objective lens 7 is provided on the distal end side of the insertion section 2, which is the objective side. , an eyepiece lens 8 is provided on the rear end side of the eyepiece section 4 .

Furthermore, inside the endoscope 11, a light guide 9 having a light distribution lens 10 at its tip is arranged in parallel with the observation optical fiber bundle 6, and the light guide 9 is connected to a universal cord extending from the side of the operation section 3. 11 and is connected to a light source device 13 via a connector 12 provided at the end of the light guide 9. Roughly speaking, within the universal cord, a signal line 16 having a contact 14 on the rear end connection surface of the eyepiece 4 is connected via a connector 17 to a vibration control unit 18 that generates a drive signal. There is.

One end of a first eyepiece 22 of an endoscope viewing device 21 is connected to the eyepiece 4, and an imaging lens is installed in the first eyepiece 22 with the optical axes aligned. 23. A beam splitter 24 and an eyepiece lens 26 are provided which transmit part of the incident light in the optical axis direction and reflect part of it in a direction perpendicular to the optical axis direction.

Further, from the side of the first eyepiece section 22, a viewing optical 8 is provided.
8 bundles 27 and a flexible tube 29 that accommodates an eyepiece 28 is extended behind the output end side of the viewing optical 411 bundle 27.
A second eyepiece section 31 is formed at the end on the eyepiece side. In addition, piezoelectric elements 32 and 32 are attached to the sides of the viewing optical fiber bundle 27 near the entrance end and the exit end, respectively, and these piezoelectric elements 32 and 32 are connected to the signal line 33, respectively, and the signal The wire 33 connects to the connection surface of the eyepiece 4 of the endoscope 1 on the connection surface of the endoscope viewing device 21 .
and is connected to the contact point 14 on the endoscope 11 side. Furthermore, said piezoelectric element 32.32
．． The optical fiber bundle 27 for viewing on the endoscope viewing device 21 side is controlled by the drive signal generated by the vibration control unit 18 via the
The arrangement of the optical fiber elements is the optical fiber element array 5 of the observation optical fiber bundle 6.
1/ in the direction perpendicular to the optical axis for the arrangement of iutt elements.
It vibrates with an amplitude that causes a two-pitch deviation.

With the above configuration, light is emitted from the light source device 13,
The light emitted from the light distribution lens 10 to the subject via the light guide 9 is reflected by the subject, and this reflected light is
An optical image is formed by the objective lens 7 at the input end of the vA detection optical system 1lilff bundle 6.

The optical image is transmitted by an observation optical TL fiber 6,
It is transmitted to the eyepiece lens 26 side of the endoscope viewing device 21 side, and a part of the light is reflected perpendicularly to the optical axis by the beam splitter 24, and is transmitted to the eyepiece lens 28 via the viewing optical fiber bundle 27. be done.

By the way, the piezoelectric elements 32 and 32 attached to the sides close to the input Di end and the output end of the viewing optical m fiber bundle 27 on the endoscope viewing device 21 side generate vibrations from the vibration control unit 18. , the array of optical fiber elements constituting and covering the optical fiber bundle for viewing 27 is controlled by the drive signal obtained through the endoscope 1, and the optical tI! It vibrates so as to be shifted by 1/2 pitch with respect to the arrangement of miscellaneous elements, thereby preventing mesh and moiré from occurring in the optical image obtained on the eyepiece lens 28 side.

As described above, according to this embodiment, it is possible to prevent moiré, and therefore it is possible to produce an image with good resolution.

FIG. 2 is an explanatory diagram showing the configuration of an endoscope viewing device according to a second embodiment of the present invention.

In this embodiment, in addition to the endoscope of the first embodiment, a piezoelectric material that vibrates synchronously in response to a drive signal from the vibration control section 18 is also installed on the sides of the observation optical fiber bundle 6 near the entrance end and the exit end. Elements 36.36 are each mounted. Therefore, since the optical fiber bundle 6 for observation and the optical fiber bundle 27 for viewing are synchronously vibrated, a high-resolution image with no mesh or moire can be obtained, making it possible to take photographs. Further, the other functions and effects of Structure 2 are the same as those of the first embodiment.

[Effects of the Invention] As explained above, according to the present invention, the optical fiber bundle for viewing is vibrated, and the arrangement of the optical fiber bundle for viewing is changed to one with respect to the arrangement of the optical fiber bundle for viewing on the endoscope side. By shifting /2 pitches, it is possible to prevent the occurrence of mesh and moiré.
High resolution images can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of an endoscope viewing device according to a first embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the configuration of an endoscope viewing device according to a second embodiment of the present invention. It is a diagram.

Claims (1)

[Claims] A periodic vibration means is provided, which is attached to a side close to an input end and an output end of an optical fiber bundle built in the endoscopic viewing device, and causes the input end and output end of the optical fiber bundle to synchronously vibrate. An endoscope viewing device characterized by: