JPH0131162B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an endoscope device, and in particular to a lens support frame in which an objective lens system is incorporated when a solid-state image sensor is incorporated in the distal end component of an endoscope insertion portion. The present invention relates to an endoscope device in which a mounting member to which a solid-state image pickup device is attached is inserted in advance into the support frame in a state centered with respect to an objective lens system, and can be fixed at a focused position.

[Technical background of the invention and its problems] In recent years, charge-coupled devices (hereinafter referred to as CCDs) have been used in television cameras, electronic cameras, endoscopes, etc.
Devices using solid-state imaging devices such as the following have been developed as imaging means.

In an endoscope apparatus using such a solid-state image sensor, the distal end component of the endoscope insertion section is configured as shown in FIG. That is, an objective lens 2 is attached to the tip of an insertion section 1 inserted into a living body cavity or a cavity of a mechanical component, etc., and the light L from the object to be observed passes through the objective lens 2. The image is formed on the light-receiving surface of a solid-state image sensor 3, and the formed optical image is converted into an electrical signal 4 and sent to the next stage signal processing circuit, where the necessary signal processing is performed and the image is transmitted to the television monitor. displayed above. On the other hand, an illumination lens 5 is provided at the tip of the endoscope insertion section 1.
For example, an external light source device is guided through a light guide 6 to an illumination lens 5 to illuminate the object to be observed.

By the way, in the endoscope device configured as described above, when the solid-state image sensor 3 is installed behind the objective lens 2 disposed at the tip of the endoscope insertion section 1, the objective lens 2 and the solid-state image sensor While the optical axes of the solid-state imaging device 3 are made to coincide with each other, the solid-state imaging device 3 is arranged at a predetermined distance F from the objective lens 2 so that the light-receiving surface of the solid-state imaging device 3 is at an optimal focus position.

However, in conventional endoscope devices, when incorporating a solid-state image sensor into the tip of the endoscope insertion section,
Because it is necessary to individually adjust the solid-state image sensor with respect to the objective lens for each endoscope device, it is necessary to align the optical axes of the objective lens and the solid-state image sensor, and to focus the light-receiving surface of the solid-state image sensor. There was a problem in that it was complicated to arrange it at a certain location.

[Object of the Invention] In view of the above-mentioned points, the present invention is designed to easily align the optical axes of the objective lens system and the solid-state image sensor when incorporating the solid-state image sensor into the distal end portion of the endoscope insertion section, and An object of the present invention is to provide an endoscope device whose light-receiving surface can be quickly set and fixed at a focus position, and whose ease of assembly during assembly is improved.

[Summary of the Invention] The endoscope device of the present invention includes a mounting member that is centered in advance with respect to the objective lens system on the light-receiving surface side of the solid-state image sensor so that it can be inserted into the lens support frame of the objective lens system. The mounting member is inserted into the lens support frame to fix the solid-state image sensor in a focused position.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 2 is a sectional view showing the configuration of the endoscope apparatus according to the present invention. However, the same reference numerals as in FIG. 1 indicate corresponding parts, and illumination means such as an illumination lens and a light guide are omitted.

In FIG. 2, reference numeral 1 indicates an endoscope insertion section, and this endoscope insertion section 1 is formed in a cylindrical shape, and a cylindrical lens support frame 8 is disposed in the axial direction at its distal end component. An objective lens system 2A, which is a combination of a plurality of lenses, is incorporated into the support frame 8. The objective lens system 2A is incorporated in the front side of the lens support frame 8, and the support frame 8 is configured in a cylindrical shape extending rearward, and is fixed within the tip structure using, for example, screws 9. Reference numeral 10 is a package that houses a solid-state image sensor 3 such as a CCD, and the solid-state image sensor 3 is housed so that its light-receiving surface is exposed at the front. An optical glass 11 centered with respect to the objective lens system 2A is bonded to the light-receiving surface side of the package 10. Therefore, the optical glass 11 has a protruding cylindrical shape so that it can fit into the inner peripheral surface of the lens support frame 8. The tip end surface of the optical glass 11 may be a flat surface, or may be formed into a curved surface as shown in FIG. 3 so as to be part of a lens system. Furthermore, it may be configured using self-opening instead of optical glass.

In the endoscope device configured in this way, light from the object to be observed is imaged through the objective lens system 2A, but the image formation position is located at the lens support frame 8 due to the combination of a plurality of lenses. It is designed to be located almost at the rear end of the Therefore, when assembling an endoscope, the support frame 8 incorporating the objective lens system 2A is fixed within the distal end component of the endoscope insertion section 1,
After that, the package cage 10 is inserted through the opening at the rear end of the support frame 8.
By simply inserting the portion of the optical glass 11 that protrudes from the front, the solid-state image sensor 3 can be fixed at an optimal imaging position with the optical axes of the objective lens system 2A and the solid-state image sensor 3 aligned.

FIG. 4 shows another embodiment of the present invention, in which a cylindrical frame 12 is joined to protrude from the light receiving surface side of a package 10 housing a solid-state image sensor 3, and this frame 12 is made of metal. It is formed of a member, etc., and is inserted into the inner circumferential surface of the lens support frame 8 from the rear end thereof so that it can be fixed at a focused position. Therefore, in this case, the light converged by the optical lens system 2A passes through the hollow portions of the support frame 8 and the frame body 12 and forms an image on the light-receiving surface of the solid-state image sensor 3.

In the illustrated example, the objective lens in the front row is directly assembled to the tip component 1, but instead of this configuration, the lens support frame 8 is extended further forward to accommodate the objective lens including the objective lens in the front row. It is also configured to incorporate the entire system 2A within the lens support frame 8. With this configuration, the mounting member bonded to the solid-state image sensor 3 is inserted in advance into the lens support frame 8 incorporating the objective lens system 2A, and the tip component is attached with the solid-state image sensor 3 set. It can also be incorporated and fixed inside 1.

FIG. 5 shows an example of the overall configuration of an endoscope apparatus according to the present invention. In this figure, reference numeral 1 denotes an endoscope insertion section, which is usually made of a metal member or a flexible member, and has an optical lens system 2A and an illumination lens 5 disposed at its tip. Behind the illumination lens 5 is a light guide 6 such as an optical fiber bundle.
is arranged so that the illumination light from the light source device 13 passes through the light guide 6 and is irradiated onto the object to be observed from the illumination lens 5. However, code 13
A is a filter for correcting spectral characteristics. Further, the optical lens system 2A is supported and fixed on a support frame 8, and behind it is an optical glass 11 on the light receiving surface side.
The CCD 3 (or the frame body 12) joined thereto is arranged so as to be movable back and forth. In this case, the CCD 3 is a color imaging element equipped with a color mosaic filter or a color stripe filter on the light receiving surface so as to enable color photography, and is installed in the package 10. The light reflected by the object to be observed is passed through the optical lens system 2A.
Through a color mosaic filter or a color stripe filter, the three-color light of R (red), G (green), and B (blue) is transmitted through a color mosaic filter or a color stripe filter.
An image is formed on the light-receiving surface of the CCD 3 , converted into an electric signal using a driver and preamplifier circuit 14 that drives the CCD 3 and amplifies the CCD output, is extracted, and is input to the signal processing circuit 15 . The signal processing circuit 15 is mainly composed of R, G, and B sample and hold circuits 16, 17, and 18, and electrical signals are generated by sampling pulses corresponding to color mosaics or color stripes from a sampling pulse generation circuit 19. Each R, B, and B is sampled and held and output to the color monitor 20. Therefore, the R, G, B sample and hold circuits 16, 1
R, G, and B signals are output from 7 and 18 and displayed in color on the monitor 20.

[Effects of the Invention] As described above, according to the present invention, a mounting member that protrudes from the light-receiving surface side of the solid-state image sensor and is centered with respect to the objective lens system is provided on the lens support frame of the objective lens system. Therefore, during assembly, by simply inserting this mounting member into the lens support frame, it is possible to fix the solid-state image sensor in the focused position while centering it with respect to the objective lens system, making it easier to assemble the endoscope device. can significantly improve performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view illustrating the distal end component of a conventional endoscope device, FIG. 2 is a sectional view showing an embodiment of the distal end component of the endoscope device according to the present invention, and FIG. 2 is a sectional view showing another embodiment of the optical glass, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. 5 is a configuration diagram showing an example of an endoscope device according to the present invention. be. 2A...Objective lens system, 3...Solid-state image sensor, 8...
Lens support frame, 11, 12... mounting member.

Claims (1)

[Scope of Claims] 1. A lens support frame is provided in the axial direction of the distal end component of the endoscope insertion section, and an objective lens system is installed in this lens support frame, and the objective lens system is fitted and attached from the rear end side of the lens support frame. The solid-state image sensor is attached to the rear end of the solid-state image sensor mounting member in a state centered with respect to the objective lens system in the lens support frame, and the solid-state image sensor mounting member in this attached state is attached to the rear end of the lens support frame. An endoscope apparatus characterized in that the solid-state image sensor mounting member is fitted from the side and fixed to the lens support frame at a position where the objective lens system and the solid-state image sensor are in focus. 2. The endoscope apparatus according to claim 1, wherein the solid-state image sensor mounting member is made of an optical member.