JPH05307147A - Hard endoscope device - Google Patents

Abstract

PURPOSE:To provide the small and lightweight hard endoscope device having a focusing mechanism which can make focusing even at the time of observation by the naked eyes and is aligned to an optical system. CONSTITUTION:A slide ring 22 is external-fitted onto the rear and of an outside cylinder 20 of an operating part and further, a cam ring 23 is freely turnably fitted onto the rear end. A pin 24 is external-fitted to a slide guide groove 20a and cam groove 23a provided in alignment to the optical system at this time. An image pickup part 11 or eyepiece 12 for observation by the naked eyes is screwed to the internal screw threads 9 of the slide ring 22. The slide ring is slid in the optical axis direction by turning of the cam ring 23 by this constitution, by that, the focusing to the image pickup part 11 or the eyepiece 12 is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rigid endoscope apparatus having a detaching means for selectively attaching and detaching an image pickup portion and an eyepiece portion and a focus adjusting mechanism.

[0002]

2. Description of the Related Art In recent years, by providing an observation means on the distal end side of an elongated insertion portion, it is possible to diagnose a diseased part in the body without the need for incision and to perform a medical treatment using a treatment tool as necessary. Endoscopes have become widely used. This endoscope is roughly classified into a flexible endoscope having a flexible insertion portion and a rigid endoscope having a rigid insertion portion.

The above-mentioned flexible endoscope has an advantage that it can be inserted through a bent insertion path, while the rigid endoscope has an advantage that it can be accurately inserted into a target site although it can be inserted only linearly. Moreover, in a flexible endoscope, it is necessary to use a flexible fiber bundle as an image guide for transmitting an image backward, and the resolution is limited by the number of fiber bundles, whereas in a rigid endoscope, it is used as an image guide. A relay optical system can be used, which has the advantage that the resolution can be increased.

Furthermore, in recent years, in the case of diagnosis with the rigid endoscope, an imaging device is attached to the eyepiece portion of the rigid endoscope in order to investigate later and to know changes in symptoms, etc. It became possible to record. But,
If the image pickup device is further attached to the eyepiece, the entire operation unit becomes very large, which hinders the operation. Therefore,
For example, as disclosed in Japanese Patent Laid-Open No. 63-274907, wearing of an eyepiece for observing with the naked eye and wearing of an imaging device for photographing have been performed alternately. Further, Japanese Patent Laid-Open No. 2-280110 discloses an attaching / detaching means for attaching / detaching the image pickup unit and the rear end of the operation unit in a watertight manner and easily.

In the rigid endoscope, when the distance between the observing body and the objective optical system changes, the image forming position of the relay optical system also changes, so that focus adjustment becomes necessary. In the prior art, since the focus is adjusted by the optical system built in the image pickup unit, the image pickup unit becomes large, the weight also increases, and the operability of the endoscope deteriorates. Moreover, in order to be compatible with endoscopes having various depths, it is necessary to increase the moving range of the optical system of the image pickup unit in accordance with the endoscope with the smallest depth, which further increases the size of the image pickup unit. Was there.

Further, in the conventional endoscope apparatus, since focus adjustment cannot be performed when observing with the naked eye, it is very difficult for a person who has a weak focus adjusting function due to presbyopia or the like,
It has been difficult to alternately perform naked-eye observation by the eyepiece section and photographing by the imaging section.

[0007]

As described above, in the prior art, the focus adjusting means capable of coping with various optical systems is provided in the image pickup section, and therefore the focus adjusting means is optimized for each optical system. However, the size of the image pickup section is increased, and the operability of the endoscope is deteriorated. further,
The focus could not be adjusted during visual observation with the eyepiece.

The present invention has been made in view of these circumstances, and the focus can be adjusted even when observing the naked eye with the eyepiece.
It is an object of the present invention to provide a compact and lightweight rigid endoscope device which has a focus adjusting mechanism optimized for an optical system and does not deteriorate the operability of the endoscope.

[0009]

An elongated rigid insertion portion is extended from a tip end side of an operation portion, an objective optical system is internally provided at a tip end portion of the insertion portion, and an optical image is formed by the objective optical system. In a rigid endoscope device in which a relay optical system for transmitting an image is arranged from the insertion section to the operation section, in the operation section, an image pickup section including an image pickup element and an eyepiece section including an eyepiece optical system are selected. And an adjusting means for making the image pickup section or the eyepiece section slidable with respect to the relay optical system in the optical axis direction.

[0010]

[Operation] In the configuration of the present invention, the image pickup unit or the eyepiece unit is attached / detached by the attaching / detaching means, and the focus adjustment of the optical image formed on the image pickup unit or the eyepiece unit by the relay optical system is provided in the operation unit. This is done by sliding the adjusting means in the optical axis direction.

[0011]

1 to 4 relate to a first embodiment of the present invention. FIG. 1 is a sectional view of a rigid endoscope, an image pickup section and an eyepiece of the first embodiment, and FIG. 3 is a front view of the rigid endoscope shown in FIG. 1, and FIG. 4 is a circuit explanatory view of a video process circuit.

As shown in FIG. 2, the rigid endoscope device 1 is inserted into the body to obtain an observation image signal.
A camera control unit (hereinafter referred to as CCU) 3 to which the rigid endoscope 2 is connected, and a color monitor 4 that displays a video signal input by connecting a signal cable to the signal output end of the CCU 3. Become.

The rigid endoscope 2 has an elongated insertion portion 6 extending forward from the operation portion 5. The operation portion 5 has a light guide mouthpiece 8 on the outer peripheral side surface and a female screw 9 for attachment / detachment at the rear end portion. And are provided. By screwing the male screw 28 of the image pickup unit 11 into the female screw 9, the integrated rigid endoscope 2 as shown in FIG. 2 can be configured. On the other hand, by screwing the male screw 38 of the eyepiece 12 which is the eyepiece portion with the female screw 9, a hard endoscope capable of observing with the naked eye can be configured.

The insertion portion 6 includes an outer tube 13 made of a metal such as stainless steel, a lens tube 14, and an outer tube 1.
The light guide 15 formed of a fiber bundle is inserted into the crescent-shaped portion shown in FIG. 3 between the lens 3 and the lens tube 14.

The rear end side of the light guide 15 is bent in the operating portion 5 and fixed by the light guide base 8. As shown in FIG. 2, one end of the light guide cable 7 is connected to the light guide base 8, and the other end of the light guide cable 7 is connected by the light guide connector 10 to the light source unit 43 of the CCU 3.
By connecting to the connector receiver 44, the white light emitted from the white lamp 45 and condensed through the condenser lens 46 can be transmitted. With this configuration, the illumination light supplied to the light guide connector 10 passes through the light guide cable 7 and the light guide 15 that is inserted through the insertion portion 6 to the observation body from the light guide emission end surface exposed at the insertion portion distal end surface. It is emitted toward and illuminates the observation body.

The front end of the lens tube 14 is a cover glass 1
It is closed at 6, and an objective lens system 17 is arranged in front of and behind it. The optical image formed by the objective lens system 17 is transmitted to the operation unit 5 by the relay optical system 18 arranged further in front of and behind the objective lens system 17. The rearmost relay lens 19 in the relay optical system 18 is the outer tube 13
It reaches the inside of the operation part outer cylinder 20 joined to the rear end.

The rear end portion of the operating portion outer cylinder 20 is provided with a slide groove 20a in the optical axis direction on the side wall, and a slide ring 22 is slidably fitted on the outer periphery of the slide ring 22.
A cam ring 23 having a cam groove 23a on its outer periphery is rotatably fitted on the outside. Further, the pin 24 provided on the slide ring 22 projects into the slide groove 20a and the cam groove 23a, and when the cam ring 23 is rotated, the slide ring 22 slides in the optical axis direction. A female screw 9 is provided on the inner surface of the rear end portion of the slide ring 22, and by engaging with a male screw 28 formed on the outer periphery of the front end portion of the image pickup unit 11, the image is formed at the image forming position of the relay lens 19 in the image pickup unit 11. The image pickup surface of the CCD 29 provided can be exposed.

In front of the image pickup surface of the CCD 29, red, green,
A color mosaic filter 30 in which blue color filters are arranged in a mosaic pattern is arranged to separate the optical image formed on the image pickup surface of the CCD 29 into red, green and blue. The CCD 29 is fixed to the outer frame member 32 of the image pickup section 11 via a CCD fixing frame 31.

The CCD 29 is connected to a signal cable 33, and the signal cable 33 is connected by a connector 34 to the CCU 3
It is designed to connect with. The CCD 29 is driven by applying a CCD drive signal from the drive circuit 35 to the CCD 29, and the image signal is output from the CCD 29 to the video process circuit 36.

The structure of the video process circuit 36 is shown in FIG.
Shown in. The output signal of the CCD 29 is input to the luminance signal processing circuit 50, and the luminance signal Y is generated. Also, CC
The output signal of D29 is input to the color signal reproduction circuit 51, the color difference signals RY and BY are generated in time series for each horizontal line, and white balance compensation is performed by the white balance circuit 52, one of which is an analog switch. Directly to 53, the other one is delayed by one horizontal line by a 1H delay line 54 and input to an analog switch 55, and a color difference signal R is generated by a switching signal of a timing generator (not shown).
-Y, BY are obtained. The outputs from the luminance signal processing circuit 50 and the analog switches 53 and 55 are NTSC.
It is input to the encoder 56 and output as an NTSC composite video signal. The output video signal is input to the color monitor 4 and observed as a color video.

On the other hand, in the case of observing with the naked eye, an eyepiece 39 for forming an image of the relay lens 19 on the fundus of the eye, instead of the image pickup unit 11, on the female screw 9 of the slide ring 22.
The male screw 38 of the eyepiece 12 having the above is screwed.

The rear end of the slide ring 22 is closed by a cover glass 25, the front surface of the image pickup section 11 is closed by a cover glass 37, and the front surface of the eyepiece 12 is closed by a cover glass 40. The eyepiece 11 and the eyepiece 12 are configured to be kept watertight even when they are separated from each other. In addition, in the present embodiment, the slide ring 22 and the imaging unit 11 or the eyepiece 12 are screwed together,
You may connect by providing a mount.

With the configuration of the first embodiment, the operation unit 5
By screwing the imaging unit 11 onto the relay lens 19
Directly to the image forming position of the CCD 29 without an eyepiece.
Can be arranged so that the image pickup surface of is exposed. Further, since the image pickup surface can be slid in the optical axis direction of the relay optical system by rotating the cam ring 23 of the operation unit 5, the image forming position of the relay lens 19 is changed by the change of the position of the observing body. Even if is changed, it is possible to focus by moving the image pickup surface of the CCD 29.

Moreover, since the slide ring 22 whose amount of movement is determined according to the depth of the optical system is provided on the endoscope side, the focus adjusting mechanism is optimized for the optical system of each endoscope. Also,
It is not necessary to provide a focus adjustment mechanism having a large adjustment width on the imaging unit side in order to correspond to various optical systems of rigid endoscopes, and the size and weight can be greatly reduced. Therefore, the operator can operate the insertion operation and the like with a feeling of weight almost the same as (or even lighter than) a rigid endoscope used for macroscopic observation.

Further, when switching to the naked eye observation, the eyepiece 12 can be easily replaced by changing the slide ring 22 of the operation portion 5, and the cam ring 23 can be rotated for the focus adjustment which cannot be performed in the conventional example when the naked eye is observed. It can be easily performed by moving the eyepiece lens in the eyepiece 12.

[0026]

As described above, according to the present invention, the operability of an endoscope having a focus adjusting mechanism optimized for an optical system, which is capable of adjusting the focus even when observing the naked eye with an eyepiece, is provided. It is possible to provide a compact and lightweight rigid endoscope device that does not deteriorate.

[Brief description of drawings]

1 to 4 relate to a first embodiment of the present invention,
FIG. 1 is a cross-sectional view of a rigid endoscope, an image pickup section, and an eyepiece of the first embodiment.

FIG. 2 is a structural explanatory view of a rigid endoscope device including the rigid endoscope shown in FIG.

FIG. 3 is a front view of the rigid endoscope shown in FIG.

FIG. 4 is an explanatory diagram of a video process circuit.

[Explanation of symbols]

 11 ... Imaging part 12 ... Eyepiece 17 ... Objective lens system 18 ... Relay optical system 22 ... Slide ring 23 ... Cam ring 24 ... Pin 29 ... CCD

Claims (1)

[Claims] 1. An elongated hard insertion part is extended from the operation part to the tip side, an objective optical system is internally provided at the tip part of the insertion part, and an optical image formed by this objective optical system is transmitted. In a rigid endoscope device in which a relay optical system is arranged from the insertion part to the operation part, an imaging part having an imaging element and an eyepiece part having an eyepiece optical system can be selectively attached to and detached from the operation part. A hard endoscope apparatus, characterized in that it is provided with an attaching / detaching means and an adjusting means for allowing the image pickup section or the eyepiece section to slide in the optical axis direction with respect to the relay optical system.