JP2001112709A - Capsulated endscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a practical capsulated endoscope providing good workability regarding assembly and being miniaturized. SOLUTION: The capsulated endoscope, in which an object image formed by an objective lens under the illumination of an illuminating body is focused on an image sensor and an image signal produced by the image sensor is wirelessly transmitted, includes: an objective lens barrel for supporting the objective lens; a main block having both a lens holding tube for holding the objective lens barrel and an illuminating body supporting plate part being approximately perpendicular to the lens holding tube for supporting the illuminating body; and a jig insertion hole formed radially through the lens holding tube of the main block for adjusting the position of the objective lens barrel in the direction of the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mechanism structure of a capsule endoscope.

[0002]

2. Description of the Related Art In conventional fiberscopes and electronic endoscopes, a flexible tube is used to connect an operation unit or an image monitor arranged outside a human body to an imaging head introduced into the human body. Configuration. Even if the imaging head unit is reduced in size and diameter to reduce the pain of the subject, the pain that the “tube” passes through the throat of the subject cannot be fundamentally eliminated. Therefore, in recent years, an electronic endoscope apparatus having a capsule-shaped imaging head unit without a tube and an image monitor unit separated from the other has been proposed, but the conventional proposal content is merely an idea, and actual production and use is actually performed. Has not reached the stage of doing.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a compact capsule endoscope with good assembling workability.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a capsule endoscope for illuminating with an illuminator, forming an object image formed by an objective lens on an image sensor, and wirelessly transmitting an image signal from the image sensor. An objective lens barrel for supporting the lens; a main block having a lens holding barrel for holding the objective lens barrel, and an illuminating body support plate portion for supporting the illuminating body, which is substantially orthogonal to the lens holding barrel; A jig insertion hole for adjusting the position of the objective lens barrel in the optical axis direction, which is formed so as to penetrate the lens holding barrel of the main block in the radial direction, is provided.

Alternatively, a main block for supporting the objective lens and the illuminating body; an electric element holding cylinder provided integrally with the main block; an image sensor for forming an object image by the objective lens supported on the electric element holding cylinder A circuit board having at least: an image sensor control component for controlling the image sensor; and a transmission electrical component for transmitting an electric signal output from the image sensor; and an outer case that contains the main block and the circuit board in a watertight manner; Has,
An objective lens barrel for supporting the objective lens; a lens holding cylinder formed in the main block for holding the objective lens barrel; and an illuminating body for supporting the illuminating body, which is substantially perpendicular to the lens holding cylinder. A support plate portion; and a jig insertion hole for adjusting the position of the objective lens barrel in the optical axis direction, which is formed by penetrating the lens holding barrel of the main block in the radial direction, may be provided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present capsule endoscope has a main block 10 and a circuit board 10 which are respectively sub-assembled.
0, and an outer case 50. Hereinafter, each of these subassemblies will be described.

FIG. 2 shows the main block 10. The main block 10 has a cylindrical shape as a whole, and includes, in order from the front (left side in FIG. 2), an illuminating body support plate 11, a small-diameter objective lens holding cylinder 12, and a large-diameter electric element holding cylinder 13. The illuminator support plate portion 11 holds illuminating means (light-emitting diodes) 30 located on both radial sides of the objective lens holding tube 12. The lead 31 of the light emitting diode 30 penetrates a wall surface in front of the electric element holding tube 13 and is connected to a circuit board 100 housed in the electric element holding tube 13.
The objective lens barrel 20 holds the objective lens barrel 20. The position of the objective lens barrel 20 can be adjusted in the optical axis direction. After the adjustment, the objective lens barrel 20 is fixed with the fixing screw 16. A hemispherical transparent cover 17 is fixed in front of the illuminator support plate 11. The transparent cover 17 also has a role of ensuring a distance from the objective lens 22 to the subject.

FIG. 4 is a development view of the circuit board 100. The circuit board 100 includes three circular circuit boards 110 and 12.
0 and 130 and one rectangular antenna substrate 140 are connected. An image sensor window 112 is formed in the circular circuit board (1) 110, and an image sensor 111 is fixed on the surface. Circular circuit board (2) 12
The image sensor control electric component 121 is fixed to the surface of the “0”. On the surface of the circular circuit board (3) 130, transmission electric components 131 such as a transmission amplifier and a power switch 13 are provided.
2 is fixed, and a battery compression spring 133 for holding down the battery 101 is fixed to the back surface.
These circular circuit boards 110, 120, and 130 are connected by a strip-shaped connection strip board 150, and are connected by a conductive member provided on the back surface. Circular circuit board (3) 13
An antenna board 140 having a transmitting antenna 141 disposed on the surface is further connected to 0. The length L of the antenna substrate 140 is substantially equal to the circumference of the electric element holding cylinder 13 of the main block 10, and a shield is provided on the back surface to prevent noise due to transmission. A circuit board 100 having a shape in which these parts are connected is formed into a circular circuit board (1) 11.
0, circular circuit board (2) 120, circular circuit board (3) 1
When it is bent so that 30 becomes parallel, it becomes a substantially columnar shape,
Each electric component can be efficiently stored in the electric element holding cylinder 13 of the main block 10. FIG. 3 shows the spacer 1
02 and battery 101, main block 10
Is the circuit board 100 in the housed state. The circuit board 100 having such a shape is built in the electric element holding cylinder 13,
As shown in FIG.

FIG. 6 shows an outer case 50. The outer case 50 includes a transparent cover 17 covering the front and a tubular cover 55 having a hemispherical rear end covering the rear. Cylindrical cover 5
5 is provided with a through-hole 52 having an O-ring 53 capable of maintaining watertightness, and a power switch 132 projects from the through-hole 52 to the outside (FIG. 7). Through hole 52
When the power switch 132 protruding from is pressed, the power of the capsule endoscope is turned on.

[0010] Since the capsule endoscope is swallowed into the body cavity, it is indispensable to have a round shape like the hemispherical portion 51, but conventionally it is difficult to store parts in such a rounded portion. Space was often wasted. In the present embodiment, when the main block 10 holding the circuit board 100 is housed in the cylindrical cover 55, the transmission electric component 13 provided on the circular circuit board (3) 130 inside the hemispherical portion 51 is provided.
1. The power switch 132 can be arranged without wasting space.

The main block 10 and the circuit board 1 described above
00, and the outer case 50 fix the circuit board 100 to the main block 10 and store it in the outer case 50,
When the transparent cover 17 and the tubular cover 55 are bonded in a watertight manner, a capsule endoscope can be obtained. The assembly will be described below.

Circuit board 100 on which each electric component is mounted
Is connected to the sub-assembled main block 10 (electric element holding cylinder 13) as follows. Since the circuit board 100 returns only by bending and the shape is not stable, the circuit board 100 is bonded by sandwiching the cylindrical spacer 102 between the circular circuit board (1) 110 and the circular circuit board (2) 120. The outer diameter of the spacer 102 corresponds to the inner diameter of the electric element holding cylinder 13. This circular circuit board (1) 1
10, circular circuit board (2) 120 and spacer 102
Is stored in the electric element holding cylinder 13 and the battery 10
1 is a circular circuit board (2) 120 and a circular circuit board (3) 1
30 so as to be sandwiched between them. The outer diameter of the battery 101 corresponds to the inner diameter of the electric element holding cylinder 13 and also serves as a spacer between the circular circuit board (2) 120 and the circular circuit board (3) 130. Compression spring 13 for battery
When the caulking projections 14 are tilted down and fixed while holding down 3, the cylindrical circuit board 100 and the electric element holding cylinder 13 are pressed by the battery compression springs 133, and the respective electric contact portions are stably connected. That is,
The light emitting diode 30 and the circular circuit board (1) 110 come into contact with each other, so that power can be supplied to the light emitting diode 30. Further, the image sensor 111 is pressed against the wall surface of the electric element holding cylinder 13 by the compression spring 133 and is fixed vertically to the optical axis. FIG. 5 shows a main block 1 holding a circuit board 100.
Indicates 0. Further, when the antenna block 140 is wound around the outer periphery of the electric element holding tube 13 and the main block 10 and the circuit board 100 are inserted into the outer case 50 (the tubular cover 55), the antenna substrate 140
It is stored by efficiently using a small space between the third cover 3 and the cylindrical cover 55.

The focus adjustment operation of the objective lens barrel 20 is performed as follows.
This is performed before the entire main block 10 is stored and fixed in the outer case 50. As shown in FIG. 6, a transparent cover 17 is fixed in front of the main block 10, and an adjustment jig is inserted from an adjustment hole (jig insertion hole) 15 of the main block 10 (lens holding tube 12), and the objective is inserted. The objective lens barrel 20 is moved forward and backward in the optical axis direction by using the groove 21 of the lens barrel 20, and after adjusting the focus, the fixing screw 16 is fully tightened and fixed.

An antenna substrate 140 is wound around the outer periphery of the circuit board 100 while holding the circuit board 100, and the main block 10 to which the transparent cover 17 is fixed is housed in the cylindrical cover 55.
When the transparent cover 17 and the transparent cover 17 are bonded to each other in a watertight manner, the transmission electric component 131 and the power switch 132 are built in the hemispherical portion 51 with good space efficiency (FIG. 7). As described above, this capsule endoscope has a structure including three blocks of the circuit board 100, the main block 10, and the outer case 50, so that the assembling work is easy, and the joining of the cylindrical cover 55 and the transparent cover 17 is performed. The watertightness of the entire capsule can be maintained only by making the watertight.

The use of the capsule endoscope will be described with reference to FIG. First, the power of the capsule endoscope is turned on by pressing the power switch 132, and then the subject is caused to swallow the capsule endoscope. In the body cavity, the pushed-out lumen comes into close contact with the transparent cover 17, and a portion that comes into close contact with the surface of the transparent cover 17 becomes an observation range. Fig. 1
As shown in FIG. 7, the light is illuminated by the light emitting diodes 30 provided symmetrically with the objective lens 22 interposed therebetween. The image of the illuminated object is formed on the image sensor 111 by the objective lens 22 and the image sensor control electric component 12
1 is output as an image signal. This image signal is processed by the transmission electrical component 131, transmitted from the transmission antenna 141, received by the receiving means outside the body, and can be observed.

In this embodiment, the circuit board 100 is a single board, but the circuit board 100 is divided into a plurality of boards as shown in FIG. If the connection is made, the circuit board 100 can be easily assembled. The power switch 132 has a structure that does not return (cannot be turned off) once it is turned on, and is a disposable type in which the components of the outer case 50 are adhered and the battery cannot be replaced. A simple structure is also possible. As in the present embodiment, the transparent cover 17 is
As a member on the 0 side, the transparent cover 17 and the main block 10 may be first adhered. However, the transparent cover 17 is considered as a member on the outer case 50 side, and the cylindrical cover 55 and the transparent cover 17 are assembled at the final stage of assembly. Adhesion has the advantage of requiring only one bonding operation.

[0017]

As described above, according to the present invention, since the focus of the objective lens barrel can be adjusted from the jig insertion hole, a small-sized capsule endoscope with good assembling work can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a capsule endoscope showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main block.

FIG. 3 is a side sectional view showing a circuit board housed in an electric element holding cylinder.

FIG. 4 is a development view of a circuit board.

FIG. 5 is a side sectional view showing a main block containing a circuit board.

FIG. 6 is a capsule endoscope before fixing an outer case.

FIG. 7 is a sectional view showing another section different from that of FIG. 1;

FIG. 8 is a sectional view taken along arrow VIII-VIII in FIG. 7;

9 is a sectional view taken along the line IX-IX in FIG. 7;

FIG. 10 is a sectional view taken along the line XX in FIG. 7;

FIG. 11 is a development view of a circuit board according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main block 11 Illumination body support plate part 12 Lens holding tube 13 Electric element holding tube 14 Caulking protrusion 15 Adjusting hole (Jig insertion hole) 16 Fixing screw 17 Transparent cover 20 Objective lens barrel 21 Objective lens groove 22 Objective lens 30 Lighting means (light emitting diode) 31 lead 50 outer case 51 hemispherical part 52 through hole 53 O-ring 55 cylindrical cover 100 circuit board 101 battery 102 spacer 110 circular circuit board (1) 111 image sensor 112 image sensor window 120 circular circuit board (2) 121 Image sensor control electric component 130 Circular circuit board (3) 131 Transmission electric component 132 Power switch 133 Battery compression spring 140 Antenna substrate 141 Transmission antenna 150 Connection strip substrate L Length of antenna substrate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) G02B 23/24 G02B 23/24 C (72) Inventor Tetsuya Nakamura 2-36-9 Maenocho, Itabashi-ku, Tokyo No. Asahi Gaku Kogyo Co., Ltd. (72) Inventor Masahiro Fushimi 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Gaku Kogyo Co., Ltd. (72) Taichi Nakanishi 2-36-9, Maeno-cho, Itabashi-ku, Tokyo No. Asahi Gaku Kogyo Co., Ltd. (72) Inventor Masaru Eguchi 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Gakugaku Kogyo Co., Ltd. (72) Kenichi Ohara 2-36-9 Maenocho, Itabashi-ku, Tokyo No. Asahi Gaku Kogyo Co., Ltd. F term (reference) 2H040 AA00 BA00 CA03 CA23 DA11 DA13 DA18 GA03 2H044 AC00 AE06 AJ07 DE01 4C038 CC03 CC05 CC09 4C061 AA00 BB01 CC06 DD10 FF40 JJ06 JJ13 JJ19 NN0 1 PP08 PP13 QQ06 SS01 UU06

Claims (2)

[Claims] 1. A capsule endoscope that illuminates with an illuminator and forms an object image formed by an objective lens on an image sensor, and wirelessly transmits an image signal from the image sensor, and supports the objective lens. An objective lens barrel; a main block having a lens holding barrel for holding the objective lens barrel, and an illuminating body support plate supporting the illuminating body and substantially perpendicular to the lens holding barrel; and holding the lens of the main block. A capsule endoscope having a jig insertion hole formed through the cylinder in a radial direction for adjusting the position of the objective lens barrel in the optical axis direction. 2. A main block for supporting an objective lens and an illuminator; an electric element holding cylinder integrally provided with the main block; an image sensor supported by the electric element holding cylinder for forming an object image by the objective lens. A circuit board having at least: an image sensor control component for controlling the image sensor; and a transmission electrical component for transmitting an electric signal output from the image sensor; and an outer case that contains the main block and the circuit board in a watertight manner; Further comprising: an objective lens barrel for supporting the objective lens; a lens holding cylinder formed in the main block for holding the objective lens barrel; and a lens support tube for supporting the illumination body and being substantially orthogonal to the lens holding cylinder. An illuminator support plate portion; and an optical axis direction position of the objective lens barrel, which is formed so as to penetrate in a radial direction through the lens holding barrel of the main block. Capsule endoscope characterized by having a; jig insertion hole for regulating.