JPH0287110A - Image pickup device for endoscope - Google Patents

Abstract

PURPOSE:To shorten adjusting time and to miniaturize an image pickup device by providing a means eccentrically adjusting an image pickup element only in one direction. CONSTITUTION:For the shape of a charge coupled device (CCD) housing part, a dimension SH in the lateral direction is almost the same as that of a CCD 24 in the lateral direction to fit and house the CCD without generating play. On the other hand, a dimensions SV in the longitudinal direction is slightly larger than that of the CCD 24 in the longitudinal direction to form an almost square shape possessing a clearance wherein eccentric adjustment can be performed. There are two gaps produced between end surfaces in the longitudinal direction of the CCD 24 and end surfaces in the longitudinal direction of the CCD housing part. A leaf spring 58, is inserted into one gap. A CCD holder 23 facing the gap opposite to the leaf spring 58 is provided with a screw hole, into which an eccentrically adjusting screw 52 is screwed against the energizing force of the leaf spring 58, whereby eccentric adjustment can be carried out longitudinally through a buffer plate 53 by pressing the front surface of the CCD 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image device for an endoscope, which is installed in an optical endoscope and is provided with means for adjusting eccentricity of an image carrying element.

[Prior Art] In recent years, optical endoscopes have come to be widely used in the medical and industrial fields.

Furthermore, recently, electronic endoscopes having an image pickup device such as a COD (electronic image coupling device) built into the distal end of the insertion section have been put into practical use.

In addition, by connecting an endoscope tIiJ image device (endoscope TV camera) with a built-in image sensor to the eyepiece of the optical endoscope, you can display a congratulatory image on the monitor device in the same way as with an electronic endoscope. An endoscope device capable of displaying information may also be used.

In general, the above-mentioned endoscopic imaging device needs to form an image from an optical endoscope on an image element without eccentricity.

For this reason, as a conventional example of an imaging device for an endoscope in which the image sensor can be eccentrically adjusted with respect to the optical axis of the I II image optical system, the (
Various means have been proposed and are known to perform adjustment not only in the H direction but also in the radial direction around the optical axis.

Further, in the conventional example disclosed in Japanese Patent Application Laid-Open No. 60-220669, eccentricity adjustment can be performed in both the (2) direction and the H direction.

Incidentally, it is desired that the waterfall imaging device for an endoscope be made as small and lightweight as possible for the purpose of its use and to reduce fatigue.

[Problems to be Solved by the Invention] The conventional example described above has a structure in which adjustments are made in both the ① direction and the eye direction, so the structure is complicated, making it difficult to reduce the size and weight, and it also takes time to make adjustments.

In other words, when the endoscopic image is formed on the R (gI element),
It is necessary to display the image as large as possible on the monitor screen without vignetting (missing), but in the conventional example described above, adjustments must be made in both the v and g directions, which takes time in step III.

In this case, a 1m statue of a family celebration is usually displayed in a circle on a horizontally long rectangular monitor screen, so if this circular image is displayed as large as possible on the monitor screen, even a slight deviation in the direction will cause vignetting. However, if the 11 elements are slightly horizontally elongated in the direction of the eye, they will not protrude from the imaging plane even if they are slightly shifted, and the circular image on the image plane will almost never be vignetted on the monitor screen ( , some errors are allowed in positioning the eye direction.Therefore, adjustment of the eye direction is not necessarily necessary, and if a mechanism is provided for adjusting the eye direction, it will not be possible to move as it is. There is a greater risk of misalignment than in the case where no mechanism is provided, and to prevent this, a problem arises in which adjustment in the 1] direction must also be performed.

On the other hand, in the ■ direction, vignetting will occur unless very fine adjustments are made.

As mentioned above, when there is an adjustment means in both the eye direction and the ■ direction, the adjustment becomes cumbersome and requires a special adjustment jig, which has the disadvantage of requiring a long adjustment time. there were.

The present invention has been made in view of the above-mentioned points, and provides an endoscope image carrier that can shorten adjustment time with a simple configuration, is small and lightweight, and can be displayed on a monitor screen without vignetting. The purpose is to provide equipment.

[Means and effects for solving the problem] In the present invention, the movement of the picture element is restricted in one direction corresponding to the longitudinal direction of the imaging surface of the m-image element, and the movement of the picture element is restricted in the other direction corresponding to the direction intersecting the longitudinal direction. By making the structure movable and capable of adjusting the eccentricity in the direction, the eccentricity can be adjusted easily and quickly with a precise structure. It is possible to display a mirror image.

[Example] Hereinafter, the present invention will be specifically described with reference to the drawings.

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure shows the structure of the endoscope image carrier of the first embodiment, and
The figure shows the configuration of an endoscope device equipped with a first embodiment, and a third embodiment.
Figures 5 to 5 are A-A=, B-8-, C-C in Figure 1.
- It is a line sectional view, and Figure 6 shows the inner CC from the exterior cover.
The outline of the bottle protruding from the D holder is shown.

As shown in FIG. 2, the endoscope system N1 equipped with the first embodiment includes a rigid endoscope 2 as an optical endoscope, and a rigid endoscope 112 that is attached to the rigid endoscope 112 via an adapter 3. For endoscopy) imaging device 4 and the rigid endoscopy! A light source device 5 that supplies illumination light to the lt2, a camera control unit 6 that generates a predetermined video signal from a signal imaged by the imaging device 4, and a predetermined video output from the camera control unit 6. It consists of a monitor 7 that displays signals.

Hard endoscopy above! f12 is a grip section 9 connected to the rear end of the insertion section 8 which houses an objective lens (not shown), an image guide, and a light guide, and a light guide cable 11 is connected to the side of the grip section 9. A metal part 12 is provided, and an eyepiece part 14 having an eyepiece 13 is connected to the rear end of the temple grip part 9.

The enlarged diameter portion of the adapter 3 is connected to the eyepiece 13, and the Md imaging optical system 15 is built into the cylindrical portion of the adapter 3.

The front end of the image carrier 4 of the first embodiment is connected to the rear end of the adapter, a signal cable 16 is extended from the rear end of this WR imager 4, and is attached to the rear end of the signal cable 16. By connecting the connector 16a, which has been
6 so that it can be transmitted.

By connecting the light guide connector 11a at the end of the light guide cable 11 to the light source device 5, the illumination light of the lamp 18 is condensed by the condenser lens 19 on the incident end surface of the light guide connector 11a. irradiated.

By the way, the imaging device 4 of the first embodiment has the structure shown in FIG.

A mount member provided with a screw mount 22 is fixed to the outer periphery of the front end side of the cylindrical exterior cover 21 formed of an insulating material so that it can be detachably attached to the adapter 3. This ma-kunto member is made of metal or the like with good wear resistance.

A CCD boulder 23 made of a conductive material and formed into a substantially cylindrical shape is housed inside the exterior cover 21. A C0D 24 as an image sensor is held in this CCD boulder 23, and a holder is applied to the entire surface of the CCD 24 by a CCD presser 25 and a presser spring 26. The attachment is pressed against the surface.

A filter frame 28 is fixed near the front end of the exterior cover 21 with screws 29, and a glass 30 is attached to the filter frame 28.
is attached, and a crystal filter group 32 and an infrared cut filter 33 are installed inside the rear filter frame 31. In addition, when a fiber scope is used instead of the rigid endoscope 2, the filter frame 2 with the above-mentioned glass 30 attached is
8 can be removed and replaced with a filter frame fitted with a moiré removal crystal filter.

Leads 34°34 protruding from the back surface of the C0D24,
... are fixed to the substrate 35, and these leads 34, 34
．． ... are connected to a signal cable 16, and electrically connected to CCtJ6 via this signal cable 16.

The signal cable 16 connected to the C0D 24 is the fifth
As shown in the figure, a cable holding ring 38 built into the cable support member 37 can be fixed by pressing it with a screw 39. This cable support member 37 is provided with a male screw 42 that screws into the cable fixing member 41, and can be further fixed with a fixing screw 43. A groove 44 is provided on the outer periphery from the rear end of this cable fixing member 41, and by fitting the engagement part of the couple bend stop 45 on the right side of the tapered outer circumferential surface, this cable break stop 4
5 can be installed.

By the way, the C0D 24 has a structure that allows it to be fixed to the exterior cover 21, which is attached to the adapter 3, so as to be movable in the front axis direction, so that focus adjustment can be performed.

That is, with respect to the exterior cover 21, the CCD boulder 23G fitted within the exterior cover 21 is movable in the optical axis direction (left and right directions in FIG. 1). This exterior cover 21
A compression spring 47 is housed in a space on the front end side of the CCD holder 23, and urges the front end of the CCD holder 23 backward. This CCD holder 23
The front end side of the cable support member 37 is fitted into the inner peripheral surface on the rear end side, and the rear space of the protrusion 23a protruding from the inner peripheral surface of the front end of this CCD holder 23 and the cable support member 3 are fitted.
A COO presser foot 25 and a compressed presser spring 26 are accommodated in the space around the outer periphery of the shaft diameter portion on the front end side. Therefore, the CCD presser 25 is pressed forward by the presser spring 26, and the step of the CCD presser 25 is moved to the C0D by the surface 25a.
The back edge of 24 is pressed forward.

The rear end of the CCD boulder 23 is connected to a cable support member 37.
J, S,
Rearward movement is restricted, so when this cable support member 37 is moved forward, this protrusion 37 a-
Q is pressed and the CCD boulder 23 is moved forward. This cable support member 37 can be moved back and forth by rotating a focus adjustment ring 51 that has a threaded portion that engages with a female thread provided on the inner peripheral surface from the rear end of the exterior cover 21. It is possible to move to In other words, when this ring 51 is moved U and screwed in against the biasing force of the compression spring 47, C
The CD holder 23 and the CCD presser 25 can be moved forward, and by moving the CCD presser 25, the CCD 24 can also be moved forward. On the other hand, when the ring 51 is moved in the opposite direction to the screwing direction, the biasing force of the compression spring 47 causes the C
The CD holder 23, CCD presser 25, and CCD 24 can be moved rearward. By moving this C0D 24 back and forth in the optical axis direction, the distance between the mount 21a and the CCD 24 can be changed and focus adjustment can be performed.

After the focus is adjusted by the ring 51, the eccentric adjustment screw 5 is screwed into the screw hole of the protrusion 23a of the CCD holder 23.
By screwing in the C0D24 and pressing the outer frame-shaped end surface of the C0D24 through the buffer plate 53, the eccentricity of the C0D24 can also be adjusted at the focus-adjusted position.

In addition, when the CCD holder 23 is moved relative to the exterior cover 21, so that the CCD holder 23 does not rotate.
A bottle 54 is provided to protrude inward from the exterior cover 21, and is fitted into a groove 55 provided in the axial direction on the outer surface of the CCD holder 23. This bin 5/I is the 6th
As shown in the figure, it is shaped like an oval. Further, a groove 56 is provided in the longitudinal direction of the CCD presser 25, and a protrusion 57 protruding from the front end of the cable support member 37 is inserted into this groove 56. If it rotates,
The cable support member 37 is guided by this lever 56 and moves back and forth.

By the way, this first embodiment is characterized in that it is provided with an eccentricity adjustment mechanism in addition to the focus adjustment mechanism described above.

That is, as shown in FIG. 3, regarding the inner shape of the front end protrusion 23a of the CCD holder 23, that is, the shape of the COD storage section, the lateral dimension a S +-1 is almost equal to the lateral dimension of the CCD 24. Then, it became rattled.

On the other hand, the vertical dimension Sv is slightly larger than the vertical dimension of the C0D24, and the shape is approximately square with a clearance for eccentric adjustment.

One of the two gaps formed by each longitudinal end surface of the above-mentioned C0D24 and each longitudinal end surface of the COD storage section (the gap on the left side in FIG. 3) is biased in the vertical direction. A leaf spring 58 as a member is inserted. C facing the gap on the opposite side from where this leaf spring 58 was inserted
The CD holder 23 is provided with a screw hole into which an eccentric adjustment screw 52 is screwed, and by screwing in the screw 52 against the biasing force of the leaf spring 58, the The eccentricity can be adjusted in the vertical direction by pressing the upper end surface of the C0D24.

Note that the screw 59 provided on the leaf spring 58 side is for fixing, and by tightening this screw 59 once the eccentric adjustment is completed, the CCD 24 can be fixed to the CCD holder 23.
Fixed against -C.

As shown in FIG. 3, this C0D 24 has an outer shape close to a square with four corners cut out, and a slightly laterally elongated VA image plane 24a is formed in the center thereof. Therefore, this IIl image plane 24
If a circular image is formed at point a without protruding, vignetting will not occur even if there is a slight eccentricity in the lateral direction.

Moreover, as shown in FIG. 3, the CCD holder 23 has a C0D
There are two arc-shaped notches so that the two corners of 24 are facing.

Note that, as shown in FIG. 4, the CCD holder 23 and the couple support member 37 are fixed with screws 61, 61.

Also, #l of the cable fixing member 41! ! A circumferential groove is provided on the inner peripheral surface of the end side to accommodate a watertight O-ring 62, and the outer cover 2
The fitting portion between the outer cover 21 and the filter frame 28 is also provided with the same name to accommodate the O-ring 63, and the fitting portion between the exterior cover 21 and the filter frame 28 is also provided with a circumferential groove to accommodate the O-ring 64. It is watertight.

According to this first embodiment, the endoscope 2 is connected via the adapter 3.
The imaging device 4 mounted on the
As a mounting mechanism with D24 eccentric adjustment mechanism, CCD
This is done in consideration of the fact that the vertical and horizontal dimensions of the imaging surface 24a of the camera 24 and the vertical and horizontal dimensions of the display screen of the monitor 7 are different.

In other words, although the imaging surface 24a is approximately square, it is slightly longer in the lateral direction, so when a circular image is formed, a slight eccentricity is allowed. Also, the monitor screen-b is a horizontally long rectangle, and if it is displayed in line with the horizontal direction of the C0D24, the horizontal mounting can be fixed at a fixed position without having to adjust the position. - On the other hand, for the vertical installation of the C0D24, which has small dimensions, a fine position adjustment mechanism is provided to adjust the eccentricity so that the display screen of the monitor 7 can be displayed without vignetting in the height direction. There is.

Since the above-mentioned fine adjustment mechanism is only unidirectional, the height on the display screen of the monitor 7 can be changed by screwing in the screw 52 or turning it in the opposite direction, and this adjustment can be done while looking at the monitor screen. For example, it is possible to easily and quickly set a desired state, that is, a state in which the image 11lie by the CCD 24 is displayed on both sides of the monitor without vignetting.

For example, if a family gift #1@ is imaged in a circle and this circular image is displayed in a circle on a monitor screen, the top or bottom edge of this circle will be displayed on both sides of the monitor without vignetting, as shown in Figure 2. You just have to adjust it accordingly. (The display is not limited to a circular shape, and may be displayed in a square shape.) Furthermore, the above-mentioned fine adjustment mechanism can be easily realized using the screw 52, etc.
■Small and light! It also has the advantage of being able to

FIG. 7 shows the structure of the mounting section of the COD equipped with an eccentric adjustment mechanism according to the second embodiment of the present invention.
A leaf spring 58 is inserted into one side (the lower side in FIG. 3) of the CCD 24, and the eccentricity is adjusted by screws 52 from the other side, but in this second embodiment, the eccentricity is adjusted by screws 71 and 72 from both sides. It's a mechanism. The other drawings are the same as those of the first embodiment, and the effects are also almost the same.

FIG. 8 shows the structure of a mounting section equipped with a COD eccentric adjustment mechanism in a third embodiment of the present invention.

This embodiment has a structure in which reinforcing plates 81 and 82 are interposed on the adjustment surface of the C0D 24 in the second embodiment. By interposing these plates 81.82, the screws 71.7
2, the load applied to the C0D 24 is dispersed, and the risk of damaging the C0D 24 even if excessive torque is applied during preparation can be eliminated.

In each of the above embodiments, the adapter 3 and the positive imager 4 are constructed separately, but in this case, the adapter 3 and the positive imager 4 are integrated. The present invention can also be applied to the iI device. Further, if the monitor used for display is vertically elongated, the mounting direction of the image carrying device may be changed by 90 degrees.

[Effects of the Invention] As described above, according to the present invention, since a means for eccentric adjustment is provided in only one direction of the Ilal elementary image, the adjustment time can be shortened and the R image device can be downsized. can.

[Brief explanation of drawings]

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure is a sectional view showing the configuration of the imaging device of the first embodiment, FIG. 2 is a configuration diagram of the family celebration SFT device equipped with the first embodiment, and FIGS. ',B
-8', sectional view taken along line C-C', Figure 6 is the same as Figure 1'
FIG. 7 is a bottom view showing the outer shape of the bottle when viewed from the direction, FIG. Is there an eccentric tone in the third embodiment of JH? ! ! ! The mounting with the mechanism is shown in the "tJ sectional view. 1... Endoscope device 4... Pupil image device 22... Screw mount 24... C0D 26... Presser spring 37 ... Cable support member 41 ... Cable fixing member 47 ... Compression spring 51 ... Focus adjustment ring 52 ... Eccentric adjustment screw 58 ... Leaf spring 59 ... Screw 3 ... Adapter 21...Exterior h-bar 23...CCD holder 25...COD presser diagram procedure?rll'iE document (spontaneous) Particularly 1 Office Commissioner 111 Moon Yi-dono 1, Indication of the case 1988 Hand-held application No. 239198 No. 2, Name of the invention Medical imaging device for private mirror 3, Person making the amendment, Relationship with 4r matters

Claims (1)

[Scope of Claims] An imaging device for an endoscope, which is connectable to an eyepiece of an endoscope directly or via an adapter, and includes an image sensor for capturing an endoscopic image, comprising: a transverse axis direction of the image sensor; What is claimed is: 1. An endoscope imaging device comprising: a holding means for regulating and holding only the movement of the imaging element; and a positioning means for adjusting only the eccentricity of the imaging element in the longitudinal axis direction.