JPH01214813A - Image pickup device - Google Patents

Abstract

PURPOSE:To facilitate focus control when a device is assembled and to miniaturize the device by providing a holding member, which holds a solid-state image pickup element movably in the direction of a optical axis through the use of a focusing means. CONSTITUTION:The holding member 22 which holds the solid-state image pickup element 29 is incorporated inside of an armour cover 21 and the holding member 22 is energized from the front to the back by a compression spring 34. The screw part 51 of a focusing ring 52, which presses the holding member 22 from the back to the front is screwed in the inner periphery of the armour cover 21. With this constitution, at the time of focusing the solid-state image pickup element 29, the element 29 moves forward by pushing the ring 52 and the element 29 moves backward by loosening the ring 52. By this method, the focus control can be facilitated when the device is assembled and the device can be simplified and miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an R-image device used by being connected to an endoscope via an adapter having an optical system with a fixed focal length.

[Prior art and problems to be solved by the invention] In recent years, by inserting an elongated insertion part into a body cavity, internal organs of the body cavity can be observed, and if necessary, a treatment instrument can be inserted into the channel. Endoscopes that can perform various therapeutic procedures using treatment tools are widely used.

8 of the above! Some mirrors are designed to allow a television camera to be connected to the eyepiece, for example, via an adapter.

In this way, it is well known that an imaging device such as a television camera connected to the eyepiece of an endoscope, which has an optical system capable of adjusting the focus, is In the apparatus, focusing can be performed by, for example, mechanically fixing a solid-state VI image element and moving an optical system that forms an image on the solid-state image sensor. As such an imaging device, for example, US Pat. No. 4,600.
There is one described in the specification of No. 939.

On the other hand, there is an imaging device that does not have an optical system capable of focus adjustment, as disclosed in, for example, Japanese Patent Laid-Open No. 58-106952. An example of such an imaging device is shown in FIG. The image pickup device shown in this figure includes a holder 71 that houses a solid-state image pickup device 70, and a mount portion 73 to which an image carrying optical system 72 can be attached is provided at the front end of the holder 71.

A lens barrel 74 housing an imaging optical system 72 is connected to the mount portion 73 by, for example, a screw.

The solid-state image sensor 70 is attached to a substrate 75, and the substrate 75 is attached to the inner wall of the front end of the holder 71 with a plurality of screws 76.

Further, between the holder 71 and the substrate 75, there are a plurality of springs 77 .
are interposed, and the substrate 75 is biased rearward by the plurality of springs 77. Also,
By adjusting the plurality of screws 76, the solid-state image sensor 70 can be moved back and forth together with the substrate 75, and the focus can be adjusted.

By the way, in assembling the image device as shown in FIG. 8, a plurality of springs 77... and a plurality of screws 76... are attached to the outside of the solid-state image sensor 70, and the focus is adjusted by these. After that, the exterior cover is finally put on to complete the process. However, with such a configuration, there is a problem that the entire imaging neck becomes considerably large in size compared to the size of the solid-state imaging device 70 due to the focus adjustment mechanism.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an image carrier that allows a solid-state image sensor to be moved relative to an optical system during assembly without increasing the size or complexity. There is.

[Means and effects for solving the problem] In order to achieve the above-mentioned object, a bi-image device according to the present invention has a solid-state image device fixed therein to an exterior member that is detachable from an adapter having an imaging optical system. A holding member that presses the holding member from the front to the rear and a focus adjustment member that presses the holding member from the rear to the front are installed inside, and one end of the urging member is connected to the exterior member. By partially stopping the holding member, the holding member moves back and forth by adjusting the suppression applied from the focus adjustment member, and performs focus adjustment during assembly.

[Embodiment] Figures 1 to 6 relate to the first embodiment of the present invention.
The figure is a sectional view showing the imaging device of this embodiment, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line 8-B in FIG.
Figure 4 is a sectional view taken along line C-C'' in Figure 1. Figure 5 is a cross-sectional view taken along line D in Figure 1.
-D' cross-sectional view, FIG. 6 is a schematic diagram of the inner'Pj1vA device when the imaging device of the present invention is attached.

In FIG. 6, the endoscope device 1 includes, for example, a rigid endoscope 2.
．． Adapter 3. lli image ff14. Camera control unit 5. It is composed of a television monitor 6 and a light source device 7.

The rigid endoscope II2 has a gripping part 9 connected to an insertion part 8 that houses an objective lens, an image guide, and a light guide (not shown), and a connecting part 11 for a light guide cable on the side of the gripping part 9. , an eyepiece section 13 having an eyepiece 12 is connected to the rear. An adapter 3 is connected to the eyepiece 12, and the adapter 3 has an imaging optical system 14 built therein.

Further, an imaging device 4 is connected to the adapter 3, and the imaging device @
A signal cable 16 for transmitting signals from the solid-state image sensor extends from the rear end of the camera 4, and is connected to the camera control unit 5 via a connector 17 provided at the end of the signal cable 16. This camera control unit 5 has a video signal processing circuit (not shown), and the video signal processed signal is input to the television monitor 6 and displayed as an image.

On the other hand, a light guide cable 18 that transmits the emitted light extends from the light source device 7, and a connector 19 is provided at the end of the light guide cable 18, and this connector 19 is connected to the connecting portion 11. It is now possible to do so.

As shown in FIG. 1, the imaging device 4 includes a conductive holding member 22 installed inside an exterior cover 21 so as to be movable back and forth, and a filter frame 23 at the front of the exterior cover 21. The filter frame 23 is inscribed and removably connected, and a glass (filter) 24 is built in the filter frame 23 .

Note that when a fiberscope is used for a rigid endoscope, a filter frame containing a built-in crystal filter is connected to the rigid endoscope to remove moiré.

By the way, the connection between the exterior cover 21 and the filter frame 23 is as follows.
Grooves 2 formed in the inner circumference of the exterior cover 21, for example in the circumferential direction
5 is engaged with and connected to convex portions 26 formed at at least two locations in the outer circumferential direction of the rear end portion of the filter frame 23. Further, as shown in FIG. 2, a notch 27 is formed at the front end of the exterior cover 21, and a protrusion 28 that engages with the notch 27 is formed in the filter frame 23.

The conductive holding member 22 has a cylindrical rear portion 22a1.
It is formed of a central part 22b in which a solid imager 29 is held, and a cylindrical front part 22C having a smaller diameter than the rear part.The rear part and the central part are inscribed in the exterior cover 21, and from the central part to the front part A stepped portion 31 is formed throughout.

The front portion 22C of the conductive bold member 22 is located at the opening of the filter frame 23, and the crystal filter group 32 and An infrared cut filter 33 is fixed behind this crystal filter 32.

Further, a compression spring 34 is circumscribed in the front part 22c of the conductive holding member 22, and one end of the compression spring 34 is connected to the step part 3.
1, and the other end is in contact with a convex portion 36 formed in the circumferential direction on the inner periphery of the exterior cover 21. Furthermore, the exterior cover in front of this convex portion 36 and the 117-shaped bolt member 2
An O-ring 38 for waterproofing is disposed in a space 37 formed by the outer periphery of the front portion 22c of 2.

Behind the infrared cut filter 33, as shown in FIG. 3, solid-state imaging cables 29 are formed into four (4)j! Support portion 39.39.39.39 formed on the electric holding member 22
41.41
is fixed.

Further, an insulating fiI 42 is abutted near the outer periphery of the rear end surface of the solid-state image sensor 29, and this insulating tube 42 is inscribed in and fixed to the conductive bold member 22. At the rear of this insulating cylinder 42, a fixed spring 43 is interposed, and a cable support member 44 is provided with a third cable supporting member 44 and a fourth cable support member 44 is inscribed in the holding member 22.
Positioning screws 46 facing each other as shown in the figure
．． It is fixed at 46. This positioning screw 46.46
is provided to prevent the exterior cover 21 from rotating relative to the conductive bold member, and for this purpose, a positioning screw 46 is provided on the inner circumference of the exterior cover 21 in the axial direction.
．． Grooves 47.47 are formed to allow the head of 46 to move.

Further, a female threaded portion 48 is formed in the circumferential direction on the inner periphery of the outer cover 21 behind the groove 47 formed on the inner periphery of the outer cover 21.
4. A focus adjustment ring 52 having a male threaded portion 51 on its outer periphery so as to come into contact with a convex portion 49 formed on its outer periphery.
are screwed together.

The rear cross section of the focus adjustment ring 52 is the fifth
The cable 16 is configured as shown in the figure, and the cable 16 inserted through the center of the exterior cover 21 is covered with a cylinder 53 having a partially cut-out cross section. The cylinder 53 is covered with the cable support member 44, and the cylinder 53 is pressed and fixed by a screw 54 that is inserted through the cable support member 44 and provided opposite to the cylinder 53. Further, a cable fixing member 56 is externally mounted on the cable support member 44 such that a distal end portion 56 a of the cable fixing member 56 is inscribed in the exterior cover 21 .

Furthermore, a ring 57 connected to the rear end of the exterior cover 21 is screwed into the cable fixing member 56 , and a groove 58 connected to the ring 51 is provided in a groove 58 provided around the outer periphery of the cable fixing member 56 . The tip 59a of the cable break stop 59
is being involved.

By the way, a plurality of lead receivers 61... are provided at the tip of the signal cable 16, and these lead receivers 61...
Leads 63 . . . are inserted and connected to the terminals.

The adjustment mechanism of the imaging device 4 configured as described above is possible at the time of assembly, and when the focus adjustment ring 52 is rotated in the direction in which it is pushed in, the conductive holding member 22
While being biased rearward by a compression spring 34 provided at the front, the receiver moves forward under pressure via the convex portion 49. Therefore, the crystal filter group 32 . Infrared cut filter 33. The solid-state image sensor 29 moves forward.

At this time, in order to prevent the conductive hold member 22 from rotating relative to the exterior cover 21, the positioning screw 46 screwed into the conductive hold member 22 is inserted into the groove 47 formed in the axial direction of the exterior cover 21. Since the head of the head can be moved back and forth, the II! The conductive holding member 22 does not rotate due to frictional force.

Furthermore, when the focus adjustment ring 52 is rotated in the direction of loosening, the conductive hold member 22 is moved backward by the compression spring that urges the conductive hold member 22 backward.
A crystal filter group 32 installed in 2. Infrared cut filter 33. solid! The lil elementary image 29 also moves backward.

With the above-described configuration and operation, focus adjustment can be easily performed during assembly, and the size of the imaging device can be made smaller.

FIG. 7 is a sectional view of an imaging device according to a second embodiment of the present invention.

In this embodiment, the focus adjustment ring 52 in the first embodiment is replaced with a plurality of screws 65, and a stepped portion 66 is provided around the inner periphery of the exterior cover 21. The heads of a plurality of screws 65 are engaged with the portion 66. Further, a plurality of screws 65 are screwed into convex portions 67 provided around the outer periphery of the cable support member 44. moreover,
A spring 68 is interposed between the screw 65 and the convex portion 67.

Then, tighten or loosen this screw 65,
By moving the conductive holding member 22 back and forth,
Focus is adjusted. Further, the other functions and effects of the configuration 1 are the same as those of the first embodiment.

[Effects of the Invention] As described above, according to the present invention, the optical system and the solid-state image sensor are configured such that the member to which the optical system and the solid-state image sensor are fixed inside can be moved back and forth, so that adjustment v1 structure is easy. This has the effect that the members mounted thereon can be made smaller and simpler, and the imaging device can be made smaller and simpler.

[Brief explanation of the drawing]

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure is a sectional view showing the imaging device of this embodiment, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG.
Figure 4 is a sectional view taken along line C-C in Figure 1, and Figure 5 is a cross-sectional view taken along line D in Figure 1.
-D' sectional view, FIG. 6 is a schematic diagram of the endoscope device when the a-image device of the present invention is attached, and FIG. 7 is a sectional view of the imaging device according to the second embodiment of the present invention. FIG. 8 is an explanatory diagram showing a conventional example. 21...Exterior cover 22...Conductive holding member 29...Solid @ mechanical element 32...Crystal filter group 3
3...Infrared cut filter 46...Positioning screw 47...Groove 52...Focus adjustment ring Fig. 2 Fig. 4 4ei 4'/ Fig. 3 3rd Fig. 5 Fig. 8 Procedure City official document (spontaneous) 1. Indication of the case Patent Application No. 40168 of 1988 2. Name of the invention History image device 3. Relationship with the person making the amendment case Patent applicant representative Satoshi Shimoyama

Claims (1)

[Claims] In an imaging device that converts an optical image into an electrical signal, which is connected to an endoscope eyepiece via an adapter that houses an optical system, an exterior member that is connected to the adapter, and a housing that is installed inside this exterior member are used. A holding member for fixing a solid-state image pickup device and a focus adjustment means are provided inside, and the focus adjustment means allows the holding member to move back and forth with respect to the optical axis to perform focus adjustment. imaging device.