WO2018207254A1 - Capsule-type endoscope - Google Patents

Capsule-type endoscope Download PDF

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Publication number
WO2018207254A1
WO2018207254A1 PCT/JP2017/017531 JP2017017531W WO2018207254A1 WO 2018207254 A1 WO2018207254 A1 WO 2018207254A1 JP 2017017531 W JP2017017531 W JP 2017017531W WO 2018207254 A1 WO2018207254 A1 WO 2018207254A1
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WIPO (PCT)
Prior art keywords
central axis
axis
imaging
capsule endoscope
transparent cover
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Application number
PCT/JP2017/017531
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French (fr)
Japanese (ja)
Inventor
内田佳宏
高田圭輔
市川啓介
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オリンパス株式会社
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Priority to PCT/JP2017/017531 priority Critical patent/WO2018207254A1/en
Publication of WO2018207254A1 publication Critical patent/WO2018207254A1/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor

Abstract

Provided is a capsule-type endoscope capable of obtaining an image with little flare and having a small total length. This capsule-type endoscope 1 is provided with: a columnar main body part 2; a transparent cover 3; an imaging part 4 having an imaging optical system; and a light emitting part 5 having a light-emitting region. The transparent cover 3, the imaging part 4, and the light-emitting part 5 are provided on one side of the main body part 2, the transparent cover 3 has a curved surface region, the curved surface region is located so as to cross a central axis AXc of the main body part, one of the intersection lines formed by a plane including the central axis line AXc and the curved surface region is a curved line having two focal points, the light-emitting part 5 is disposed so that a predetermined region does not include two focal points, and the imaging part 4 is disposed at a position satisfying the following conditional equation (1). 0≦(Lc-La3)/La1≦0.5 (1)

Description

Capsule endoscope

The present invention relates to a capsule endoscope.

Recently, in the field of endoscopes, endoscopes having a capsule casing (hereinafter, referred to as "capsule endoscope") inspection by is performed. In this test, the subject swallows the capsule endoscope from the mouth. The capsule endoscope, until the capsule endoscope is discharged from the body, the body of the imaging is performed.

The capsule endoscope, for example, a transparent cover is provided at one end of the housing. Inside the cover, a light source for illuminating the body, and an imaging unit for imaging the illuminated portion, is disposed.

As the light source, for example, light emitting diode (LED) is used. Further, in the body of the photographing, a wide range, it is preferable to be photographed in detail. For this reason, the imaging unit, an optical system with high resolution at a wide angle is used.

Patent Document 1, the capsule endoscope is disclosed. The capsule endoscope of the first embodiment includes a transparent cover of a hemispherical shape, and one imaging unit, a light emitting unit. Emitting portion is disposed around the image pickup unit. Imaging unit is arranged so the center of curvature of the transparent cover and the entrance pupil position of the optical system coincides. This arrangement is able to suppress the occurrence of flare entering the imaging unit.

The capsule endoscope of Embodiment 6 has a transparent cover of a hemispherical shape, and a plurality of imaging units, and the light emitting unit. Emitting portion, the radius of curvature of the center of the transparent cover is arranged to coincide with the exit pupil of the illumination optical system. This arrangement is able to suppress the occurrence of flare entering the imaging unit.

Patent No. 4363843 Publication

The capsule-type endoscope of Embodiment 1, a transparent cover is used hemispherical, the imaging unit is arranged so the center of curvature of the transparent cover and the entrance pupil position of the optical system coincides. Therefore, requiring a large space between the transparent cover and the imaging unit. As a result, the overall length of the capsule endoscope becomes longer.

The capsule-type endoscope of Embodiment 6, the transparent cover is used a hemispherical light emitting portion, the radius of curvature of the center of the transparent cover is arranged to coincide with the exit pupil of the illumination optical system. Again, it requires a large space between the transparent cover and the imaging unit. As a result, the overall length of the capsule endoscope becomes longer.

To shorten the overall length of the capsule endoscope, or closer to the transparent cover and the imaging section, or a transparent cover may be brought close and a light-emitting portion. However, in this case, easily flare occurs.

The present invention was made in view of such problems, small image is obtained flare, and an object thereof is to provide a full length shorter capsule endoscope.

To solve the above problems and achieve the object, a capsule endoscope according to at least some embodiments of the present invention,
And the column of the main body portion,
And a transparent cover,
An imaging unit having an imaging optical system,
And a light emitting unit having a light emitting region,
A transparent cover, the imaging unit and the light emitting portion is provided on one side of the main body portion,
Transparent cover has a curved region,
Curved region is positioned to intersect the central axis of the body portion,
One of the intersection line formed by a plane and a curved region including the center axis is a curve having two focal points,
So that a predetermined area does not include the two foci, the light emitting portion is disposed,
Imaging unit is characterized in that it is arranged in a position to satisfy the following condition (1).
0 ≦ (Lc-La3) /La1≦0.5 (1)
here,
Predetermined regions, region when the light emitting region of the light emitting portion is projected on the plane including the two focal points,
Lc is the distance between the first axis and the central axis,
La1 is a radius in the curve having two focal points,
La3 is a spacing between the second axis and the central axis,
The first axis passes through the center of the pupil of the imaging optical system, the central axis parallel to the axis,
The second axis passes through the focal point, the central axis parallel to the axis,
It is.

According to the present invention, less image is obtained flare, it is possible to provide a full length shorter capsule endoscope.

It is a diagram showing a schematic configuration of a capsule endoscope of the present embodiment. Is a diagram showing an internal state of the capsule endoscope. Is a diagram showing an internal state in a plane perpendicular to the center axis. Is a diagram showing an internal state in a plane including the central axis. Is a diagram showing an internal state of the capsule endoscope. Is a diagram showing an internal state in a plane including the central axis. Is a diagram showing an internal state in a plane perpendicular to the center axis. It is a diagram showing a schematic configuration of a capsule endoscope of the present embodiment. It is a diagram showing a schematic configuration of a capsule endoscope of the present embodiment. It is a diagram showing a sectional view of a capsule endoscope of Embodiment 1. It is a diagram showing a sectional view of a capsule endoscope of Embodiment 2. It is a diagram showing a sectional view of a capsule endoscope according to the third embodiment. It is a diagram showing a sectional view of a capsule endoscope according to the fourth embodiment. It is a diagram showing a sectional view of a capsule endoscope of Embodiment 5. It is a diagram showing a sectional view of a capsule endoscope of Embodiment 5.

Prior to the description of the embodiment will be described effects of the embodiment according to one aspect of the present invention. Note that when describing the effects of the present embodiment in detail will be described with reference to a specific example. However, as in the embodiment described below, embodiments are those illustrated last only some of the embodiments included in the present invention, a number of variations exist in its aspects. Accordingly, the present invention is not limited to the embodiments illustrated.

The capsule endoscope of the present embodiment, the columnar body portion, a transparent cover, and an imaging unit having an imaging optical system, and a light emitting unit having a light emitting region, the transparent cover, the imaging unit and the light emitting portion provided on one side of the body portion, the transparent cover has a curved region, the curved region is located to intersect the central axis of the body portion, it is formed in a plane and a curved region including the center axis one of that line of intersection is a curve having two focal points, so that a predetermined area does not include the two foci, the light emitting portion is disposed, the imaging unit, the following conditional expression (1) characterized in that it is arranged to satisfy positioned.
0 ≦ (Lc-La3) /La1≦0.5 (1)
here,
Predetermined regions, region when the light emitting region of the light emitting portion is projected on the plane including the two focal points,
Lc is the distance between the first axis and the central axis,
La1 is a radius in the curve having two focal points,
La3 is a spacing between the second axis and the central axis,
The first axis passes through the center of the pupil of the imaging optical system, the central axis parallel to the axis,
The second axis passes through the focal point, the central axis parallel to the axis,
It is.

A schematic configuration of a capsule endoscope of the embodiment shown in FIG. The capsule endoscope 1 includes a main body portion 2, and the transparent cover 3, the imaging unit 4, and the light emitting unit 5, a.

The body portion 2 is composed of a columnar member. Length in the direction along the central axis AXc the body 2, in a direction perpendicular to the center axis AXc longer than the length. The main frame portion 2, and a cavity is formed. Therefore, the main body portion 2 may be said to be composed by the tubular member.

The portion of the cavity, the imaging unit 4 and the light-emitting portion 5 is arranged. Further, although not shown, the portion of the cavity, the power supply, the signal processing unit, the power receiving portion and the transmitting portion is disposed.

On one side of the body 2, the transparent cover 3 is arranged. Transparent cover 3 is provided so as to protrude from the end surface of the body portion. On the other side of the main body portion 2, the bottom of Ryakuwan shape is formed. Bottom, be formed integrally with the main body portion 2, it may be formed separately from the main body portion 2.

The main body 2, the light emitting unit 5 is arranged an imaging unit 4. Emitting unit 5 and the imaging unit 4, one side of the main body portion 2, i.e., are disposed on the side where the transparent cover 3 is arranged. The end surface of one side of the main body portion 2, the distal end portion of the distal end portion and a light emitting unit 5 of the imaging unit 4 is located.

Imaging unit 4 includes an imaging optical system. By the imaging optical system, an image of the object is formed. Between the subject and the imaging unit 4, the transparent cover 3 are located. Therefore, formation of the image of the subject is performed through the transparent cover 3. The position of the image of the subject, for example, the image pickup element is disposed. Thus, it is possible to image the subject.

Emitting unit 5 includes a light emitting region. Illuminating light from the light emitting region is emitted. Between subject and the light emitting unit 5, the transparent cover 3 are located. Therefore, the illumination of the subject is performed through the transparent cover 3.

Will be described how the interior of the capsule endoscope. The state of the capsule endoscope shown in FIG. FIG. 2 (a) shows an internal state in a plane perpendicular to the center axis. FIG. 2 (b) shows the internal state of the plane including the central axis.

Plane perpendicular to the central axis AXc exist countless. 2 (a) is plane PL1 including two focus Pf (hereinafter, referred to as "surface PL1") indicates an internal state in. The two focal points Pf, described later.

Transparent cover 3 has a curved region. Curved region is located to intersect the central axis AXc of the main body portion 2. In the capsule endoscope 1, the whole of the transparent cover 3 has a curved surface area.

Plane including the central axis AXc exist countless. Therefore, there are countless intersection line formed by a plane and a curved region including the center axis AXc.

In the capsule endoscope 1, one of the myriad of intersection line is a curve having two focal points Pf. The shape of the curved surface area of ​​the capsule endoscope 1 is shaped as contained curve having two focal points Pf in countless intersection line.

In FIG. 2 (b), the line of intersection formed by the plane and the curved region including the center axis AXc is shown. Here, a curve having two focal points Pf is shown. As described above, the whole of the transparent cover 3 has a curved surface area. Thus, in FIG. 2 (b), the entire curve showing the transparent cover 3, and represents a curve having two focal points Pf.

The shape of the curved surface area, for example, a semi-elliptical surface. Semi-elliptical surface, as a rotation axis line passing through two focal points Pf, is a whole curve showing the transparent cover 3 obtained by rotating 180 degrees. The shape of the curved regions by a semi-elliptical surface, it is possible to form the transparent cover 3 in comparison with the case of the semi-circular shape to reduce the amount of protrusion of the transparent cover 3 from the plane PL1. As a result, it is possible to shorten the overall length of the capsule endoscope 1.

In the capsule endoscope 1, the light emitting unit 5 is disposed in the center of the main body portion 2. However, the light emitting unit 5 is arranged so that a predetermined area does not include the two focal points. Predetermined region, light emitting region of the light emitting portion is an area when projected to the plane PL1. Thus, the position and size of the light emitting region of the light emitting unit 5, the position of the two focus Pf is set so as not to include a predetermined area.

In the capsule endoscope 1, a portion of the light emitted from the position of one focus Pf, is reflected by the transparent cover 3. The light reflected by the transparent cover 3 reaches the position of the other focal point Pf.

As described above, the position and size of the light emitting region of the light emitting unit 5, the position of the two focus Pf is set so as not to include a predetermined area. Therefore, the position of the focal point Pf, or the illumination light emitted from the vicinity of the focal point Pf is absent. As a result, illumination light emitted from the light emitting unit 5 is directly never incident on the imaging unit 4.

In the capsule endoscope 1, the imaging unit 4 is arranged on the periphery of the main body portion 2. Imaging unit 4, the center Pp of the pupil of the imaging optical system on the line connecting two focal points Pf is to be located, are arranged. However, in FIG. 2 (b), the imaging unit 4, the center Pp of the pupil of the imaging optical system is arranged so as not to coincide with the focal point Pf. Furthermore, the imaging unit 4, so as to position the center Pp of the pupil of the imaging optical system between the focal point Pf and the outer peripheral surface of the main body portion 2 is arranged.

In this case, as shown in FIG. 2 (b), the first axis AXp is located between the second axis AXf and the outer peripheral surface of the main body portion 2. First axis AXp passes through the center Pp of the pupil of the imaging optical system, a central axis AXc parallel axes. Second axis AXf passes through the focal point Pf, the center axis AXc parallel axes.

Furthermore, the imaging unit 4 is disposed at a position satisfying conditional expression (1).

Condition (1) is a conditional expression relating to a preferred position of the imaging unit. The preferred location of the imaging unit may be determined at intervals La3 the radius La1 and second axes AXf the central axis AXc in the curve with a spacing Lc, 2 single focal point of the first axis AXp the central axis AXc.

La1 is can be determined from the line of intersection formed by the plane and the curved region including the center axis AXc, it can also be determined in other ways. For example, by the plane PL1 and a curved region, the line of intersection is formed. This line of intersection represents the outer periphery of the curved area. La1 is among the intervals between the points on the periphery of the central axis and a curved region, a distance of maximum.

Further, from the outer periphery of the curved region can be obtained La2. La2 is among the intervals between the points on the periphery of the central axis and a curved region, a smallest interval.

If the shape of the curved surface region of the semi-ellipsoid, La1 corresponds to the length radius of the ellipse, La2 correspond to the short radius of the ellipse.

Part of the illumination light emitted from the light emitting unit 5 is reflected by the transparent cover 3. When the illumination light reflected by the transparent cover 3 is incident on the imaging unit 4, the flare is generated. By satisfying conditional expression (1), it is possible to suppress the occurrence of flares.

The capsule endoscope of the present embodiment, a plurality of the imaging unit, each of the plurality of imaging units are preferably arranged so as to satisfy the conditional expression (1).

As described above, the shape of the curved region, there is a semi-elliptical surface. Semi-elliptical surface, as a rotation axis line passing through two focal points Pf, is a whole curve showing the transparent cover 3 obtained by rotating 180 degrees. Thus, the semi-ellipsoid, not in rotationally symmetric surface with respect to the central axis AXc.

To rotationally symmetrical shape with respect to the central axis AXc the shape of the curved regions, the central axis AXc as a rotation axis, the entire curve showing the transparent cover 3 may be rotated 180 degrees. Also in this manner, it is possible to form the transparent cover in comparison with the case of the semi-circular shape to reduce the amount of protrusion of the transparent cover from the plane PL1. As a result, it is possible to shorten the overall length of the capsule endoscope 1.

Figure 3 shows the interior of state in a plane perpendicular to the center axis. In Figure 3, configured with one light emitting unit and the two imaging units is shown. The shape of the curved surface region of the transparent cover 3 'is adapted to rotationally symmetric shape with respect to the central axis AXc. In this case, the two focal Pf is located on the circumference of a circle centered on the central axis AXc.

Emitting unit 5 is arranged so that a predetermined area does not include the two focal points. Thus, illumination light emitted from the light emitting unit 5 is directly never incident on the imaging unit 4 and the imaging unit 4 '.

In the transparent cover 3 ', of the line of intersection formed by the plane and the curved region including a central axis, a curve having two focal points are present at least two. FIG. 3 shows an internal state in the plane PL1 containing the two focal points Pf and two foci Pf '.

Imaging unit 4 has a center Pp of the imaging optical system, the imaging unit 4 'the center Pp of the imaging optical system' having. Imaging unit 4, the center Pp of the pupil of the imaging optical system on the line connecting two focal points Pf is to be located, are arranged. Imaging unit 4 'has two focal Pf' center Pp of the pupil of the imaging optical system on the line connecting the 'is to be located, are arranged. Imaging unit 4 and the imaging unit 4 'are both disposed in a position satisfying conditional expression (1). Therefore, it is possible to suppress the occurrence of the flare.

As described above, in the capsule endoscope, it is preferable that the wide range of the body, can be taken in detail. If the imaging unit is one, it must shoot the photographic range by a single imaging unit. Therefore, imaging magnification of the imaging optical system is reduced.

For example, lesions of the same size, and imaged by an optical system imaging scale is small and the imaging magnification is large optics. In this case, the image of the lesion, as compared with the imaging magnification is large optical system, toward the optical imaging magnification is small systems is reduced.

As a method for observing an image of a lesion in detail, for example, it captures an image of the lesion, a method of the obtained image to electronic enlargement. However, in this method, the resolution of the image deteriorates by expanding. For this reason, it can not be sufficiently detailed observation.

The capsule endoscope of this embodiment is provided with a plurality of the imaging unit. In this case, in each imaging unit, it is possible to increase the imaging magnification of the imaging optical system. Thus, it is possible to achieve both a wide range observation and detailed observation. Furthermore, each imaging unit is configured to satisfy the conditional expression (1). Therefore, image with less flare can be obtained.

In the capsule endoscope of the present embodiment, the imaging unit has an incident surface which is located closest to the transparent cover, the light emitting unit has an exit surface located closest to the transparent cover , the imaging unit includes a first axis and the central axis are arranged in parallel, in the direction along the central axis, the plane of incidence, is preferably located on the transparent cover side of the exit surface.

In this way, it is possible to narrow the gap between the transparent cover and the imaging unit. As a result, it is possible to shorten the overall length of the capsule endoscope. In addition, it is possible to suppress the occurrence of the flare.

In the capsule endoscope of the present embodiment, the imaging unit has an incident surface which is located closest to the transparent cover, the light emitting unit has an exit surface located closest to the transparent cover it is preferable to satisfy the following condition (2).
0.01 ≦ (Zc-Zb) /La1≦1.0 (2)
here,
Zc is the distance to the entrance surface from a predetermined surface,
Zb is the distance to the exit surface from a predetermined surface,
La1 is a radius in the curve having two focal points,
Predetermined plane is orthogonal to the central axis, and the surface including the center of the pupil of the imaging optical system,
Distance direction of distance along the central axis,
Distance of the code, the direction is positive towards the transparent cover from the predetermined surface,
It is.

Figure 4 shows the interior of state in the plane including the central axis. 2 are denoted by the same numerals for the same structure as (b), description will be omitted.

In Figure 4, the predetermined plane PL2, the distance Zb to the exit surface 7 is shown a distance Zc and a predetermined surface PL2, to the entrance surface 6 from the predetermined plane PL2. Predetermined plane PL2 is perpendicular to the center axis AXc, and a plane containing the center of the pupil Pp of the imaging optical system.

If the exit surface 7 is not flat, the distance from the predetermined surface PL2 to the exit surface 7 is different at each point on the exit surface 7. In this case, the distance Zb is among the distance from the predetermined surface PL2 to each point on the exit surface 7, a distance of maximum.

By satisfying the conditional expression (2), it is possible to reduce the distance between the transparent cover and the imaging unit. As a result, it is possible to shorten the overall length of the capsule endoscope. In addition, it is possible to suppress the occurrence of the flare.

In particular, in a state where the imaging unit and the first axis and the central axis are arranged parallel, it is preferable to satisfy the conditional expression (2).

In the capsule endoscope of the present embodiment, the imaging unit has an incident surface which is located closest to the transparent cover, it is preferable to satisfy the following conditional expression (3).
-0.5 ≦ Zc / La1 ≦ 0.5 (3)
here,
Zc is the distance to the entrance surface from a predetermined surface,
La1 is a radius in the curve having two focal points,
Predetermined plane is orthogonal to the central axis, and the surface including the center of the pupil of the imaging optical system,
Distance direction of distance along the central axis,
Distance of the code, the direction is positive towards the transparent cover from the predetermined surface,
It is.

In this way, it is possible to narrow the gap between the transparent cover and the imaging unit. As a result, it is possible to shorten the overall length of the capsule endoscope. In addition, it is possible to suppress the occurrence of the flare.

The capsule endoscope of this embodiment, the curve having two focal points, a part of an ellipse, it is preferable that the minor axis of the ellipse coincides with the center axis, satisfies the following conditional expression (4) .
0 ≦ 1-rb / ra ≦ 0.9 (4)
here,
ra is, ellipse of long radius,
rb is, the short radius of the ellipse,
It is.

By not exceed an upper limit value of conditional expression (4), it is possible to shorten the overall length of the capsule endoscope. By not fall below the lower limit of conditional expression (4), while ensuring a space for arranging the imaging unit, it is possible to reduce the diameter of the transparent cover.

In the capsule endoscope of the present embodiment, the light emitting unit has an exit surface located closest to the transparent cover, the curve having two focal points are part of an ellipse, the minor axis of the ellipse There coincide with the center axis, the light emitting portion is configured to positioned inside the first predetermined circle, it is preferable to satisfy the following conditional expression (5).
-0.1 ≦ (La3-Lb- | Z'b | × tanθb) /ra≦0.7 (5)
here,
La3 is a spacing between the second axis and the central axis,
Lb is an interval between the central axis and each point on the outer edge of the light emitting region, the maximum distance,
Z'b the distance from the plane including the two focal point to the exit surface,
θb is the angle between the central axis and a predetermined direction,
ra is, ellipse of long radius,
First predetermined circle, the circle center is positioned on the central axis, the distance La3 radius,
Predetermined direction is a direction which becomes 0.1 × LI,
LI is the direction of the light intensity along the central axis,
It is.

Figure 5 shows the state of the capsule endoscope. FIGS. 5 (a) shows the internal state in a plane perpendicular to the center axis. FIG. 5 (b) shows the internal state of the plane including the central axis. FIGS. 2 (a) and denoted by the same numerals for the same structure 2 and (b), description will be omitted.

5 (a), of the distance between the center axis AXc and each point on the outer edge of the light emitting region, distance Lb becomes maximum is shown. First predetermined circle, the center is located on the center axis AXc, the distance La3 is a circle with its radius. First predetermined circle is indicated by a two-dot chain line. Emitting portion 5 is positioned inside the first predetermined circle.

Figure 5 (b), the distance Z'b from the surface PL1 to the exit surface 7, and the angle θb of the center axis AXc the predetermined direction are the shown. The predetermined direction is the direction to be 0.1 × LI. LI is the light intensity in the direction along the central axis.

If the exit surface 7 is not flat, the distance from the predetermined surface to the exit surface 7 is different at each point on the exit surface 7. In this case, Z'b is among the distance from the predetermined surface to each point on the exit surface 7, a distance of maximum.

The intensity of the light emitted from the light emitting unit 5 includes a direction along the central axis AXc, a direction intersecting the central axis AXc, at different. In the direction intersecting the central axis AXc, according increases the angle between the center axis AXc, the intensity of light is reduced. The predetermined direction is a direction in which the light intensity with respect to the direction along the central axis AXc is in 10%.

The light emitting portion, it is necessary to ensure a constant illumination in the imaging range. By not exceed an upper limit value of conditional expression (5), it is possible to secure the light emitting region sufficiently wide. Therefore, it is possible to obtain an illuminance required for imaging.

In order to ensure a wide shooting range, it is necessary that the imaging optical system in the wide-angle optical system. The wide-angle optical system, easy diameter of the optical system becomes large. Therefore, the larger the diameter of the imaging unit.

By not fall below the lower limit of conditional expression (5), while suppressing the occurrence of the flare, the space required for placement at a position close to the center axis of the imaging unit can be secured in the main body portion. This leads to the miniaturization of the capsule diameter.

In the capsule endoscope of the present embodiment, the light emitting unit has an exit surface located closest to the transparent cover, the curve having two focal points are part of an ellipse, the minor axis of the ellipse There coincide with the center axis, the light emitting portion is configured to positioned inside the first predetermined circle, it satisfies the following conditional expression (6), that part of the light emitted from the light-emitting region is shielded preferable.
(La3-Lb- | Z'b | × tanθb) / ra <0.05 (6)
here,
La3 is a spacing between the second axis and the central axis,
Lb is an interval between the central axis and each point on the outer edge of the light emitting region, the maximum distance,
Z'b the distance from the plane including the two focal point to the exit surface,
θb is the angle between the central axis and a predetermined direction,
ra is, ellipse of long radius,
First predetermined circle, the circle center is positioned on the central axis, the distance La3 radius,
Predetermined direction is a direction which becomes 0.1 × LI,
LI is the direction of the light intensity along the central axis,
It is.

As described above, the light emitting portion, it is necessary to ensure a constant illumination in the imaging range. By not exceed an upper limit value of conditional expression (6) can be secured emitting region sufficiently wide. Therefore, it is possible to obtain an illuminance required for imaging.

Furthermore, some of the light emitted from the light-emitting region is shielded. Therefore, it is possible to suppress the occurrence of flare more effectively. Shielding, for example, may be performed by the light blocking member.

In the capsule endoscope of the present embodiment, the light emitting portion is configured to positioned inside the second predetermined circle, it is preferable to satisfy the following conditional expression (7).
0 ≦ Lb / Lc ≦ 0.8 (7)
here,
Lb is an interval between the central axis and each point on the outer edge of the light emitting region, the maximum distance,
Lc is the distance between the first axis and the central axis,
Second predetermined circle, the circle center is positioned on the central axis, the distance La3 radius,
It is.

By satisfying conditional expression (7), the light emitting unit and the imaging unit, can be arranged efficiently in a limited space. Therefore, reducing the transparent cover, that is, it is possible to reduce the diameter of the capsule endoscope. In addition, it is possible to suppress the occurrence of the flare.

In the capsule endoscope of the present embodiment, the light emitting portion is configured to positioned inside the first predetermined circle, it is preferable to satisfy the following conditional expression (8).
0 ≦ Lb / La3 ≦ 0.9 (8)
here,
La3 is a spacing between the second axis and the central axis,
Lb is an interval between the central axis and each point on the outer edge of the light emitting region, the maximum distance,
First predetermined circle, the circle center is positioned on the central axis, the distance La3 radius,
It is.

By satisfying conditional expression (8), the light emitting unit and the imaging unit, can be arranged efficiently in a limited space. Therefore, reducing the transparent cover, that is, it is possible to reduce the diameter of the capsule endoscope. In addition, it is possible to suppress the occurrence of the flare.

In the capsule endoscope of the present embodiment, the shape of the curved surface region is preferably a point-symmetrical shape with respect to the central axis.

By doing so, it is possible to suppress the occurrence of flare caused by light emitted from the light emitting portion is incident on the imaging unit to multiple reflection inside the transparent cover.

In the capsule endoscope of the present embodiment, the shape of the intersection line formed by the plane including the curved region and two foci is preferably a circle.

In this way, while maintaining the strength to maintain the shape required for the capsule endoscope, it can reduce the thickness of the transparent cover. As a result, while shortening the overall length of the capsule endoscope can be suppressed from entering the imaging section of the reflected light in the transparent cover more effectively.

The capsule endoscope of this embodiment, the curve having two focal points, a part of an ellipse, it is preferable that the minor axis of the ellipse coincides with the center axis, satisfies the following conditional expression (9) .
0.4 ≦ (ra-La3) / (2 × IH) ≦ 12.5 (9)
here,
ra is, ellipse of long radius,
La3 is a spacing between the second axis and the central axis,
IH is image height in the imaging optical system,
It is.

By keeping the shape of the transparent cover properly, it is possible to reduce the outer diameter of the capsule endoscope. Condition (9), in the capsule endoscope, while maintaining a small outer diameter, while securing the space of the imaging unit and a light emitting unit, a condition which can suppress the occurrence of flares.

By not exceed an upper limit value of conditional expression (9) can be secured while reducing the outer diameter of the capsule endoscope, the space for arranging the light emitting portion. By not fall below the lower limit of conditional expression (9), it is possible to ensure a space for arranging the imaging unit.

In the capsule endoscope of the present embodiment, the imaging unit has an incident surface which is located closest to the transparent cover, the curve having two focal points are part of an ellipse, the minor axis of the ellipse There coincide with the center axis, it is preferable to satisfy the following condition (10).
1.0 ≦ (ra-La3) /Φc≦6.0 (10)
here,
ra is, ellipse of long radius,
La3 is a spacing between the second axis and the central axis,
Φc is the aperture diameter at the incident surface,
It is.

By keeping the shape of the transparent cover properly, it is possible to shorten the overall length of the capsule, to reduce the outer diameter of the capsule endoscope. Condition (10) is in the capsule endoscope, while maintaining a small outer diameter, while securing the space of the imaging unit and a light emitting unit, a condition which can suppress the occurrence of flares.

By not exceed an upper limit value of conditional expression (10), it is possible to shorten the overall length of the capsule, while reducing the outer diameter of the capsule endoscope, to ensure a space for arranging the light emitting portion. By not fall below the lower limit of conditional expression (10), it is possible to ensure a space for arranging the imaging unit.

The capsule endoscope of this embodiment has a plurality of imaging unit, the plurality of imaging units, satisfying the first imaging unit, the following conditional expression (12) satisfies the following conditional expression (11) It includes a second imaging unit, and preferably has an imaging range which the imaging unit is duplicated in the other imaging unit and the object side of the transparent cover.
60 ° ≦ θc_1 ≦ 140 ° (11)
60 ° ≦ θc_2 ≦ 140 ° (12)
here,
θc_1 the angle of view of the imaging optical system of the first image pickup unit,
θc_2 the angle of view of the imaging optical system in the second imaging unit,
It is.

If the imaging unit is plural, the imaging range at the time of imaging in one imaging unit, can be imaged by the plurality of imaging units. In this case, the imaging range at the time of imaging in one imaging unit will be divided by the imaging unit. Then, in each imaging unit, it is possible to increase the imaging magnification of the imaging optical system. Therefore, it is possible to perform a more detailed observations.

By providing a first imaging unit, thereby satisfying the expression (11), a second imaging unit that satisfies the conditional expression (12), and it is possible to achieve both a wide range observation and detailed observation.

In the capsule endoscope of the present embodiment, on the other side of the main body portion, a convex portion is provided, a plurality of the imaging unit, the plurality of imaging units, comprising a first image pickup unit having a first imaging optical system a second imaging unit having a second imaging optical system comprises, a portion of the imaging range of the first imaging unit, overlaps with the imaging range of the second imaging unit, a first imaging section, the first imaging optical are arranged such that the optical axis of the system intersects the central axis, the second imaging unit, the optical axis of the second imaging optical system is arranged to intersect the central axis, the optical axis and the center of the first imaging optical system intersection of the axis, and the intersection between the optical axis and the central axis of the second imaging optical system are preferably located on the convex portion side than the surface together comprising two focus.

Figure 6 shows the interior of state in the plane including the central axis. 2 are denoted by the same numerals for the same structure as (b), description will be omitted.

The capsule endoscope 10, on the other side of the main body portion 2, the convex portion 12 is provided. The capsule endoscope 10 has a plurality of image pickup unit. In Figure 6, state of the first imaging unit 11 is shown.

First imaging unit 11 includes a first imaging optical system. First imaging unit 11, the first imaging optical system of the optical axis AXp1 are arranged to intersect with the center axis AXc. Intersection of the optical axis AXp1 the central axis AXc of the first imaging optical system is positioned on the convex portion 12 side than the plane PL1 containing the two focal points Pf.
Figure 7 shows the interior of state in a plane perpendicular to the center axis. 7 (a) shows a case where three of the imaging unit is disposed, FIG. 7 (b) shows a case where four of the imaging unit are arranged. The shape of the curved surface region of the transparent cover is made rotationally symmetrical shape with respect to the central axis.

The capsule endoscope 20 shown in FIG. 7 (a) includes a first imaging unit 21, and the second imaging unit 22, and the third image pickup unit 23, and the light emitting portion 24, a. Emitting unit 24 is disposed in the center of the main body portion. First imaging unit 21, the second imaging section 22 and the third image pickup unit 23 is arranged to surround the light emitting unit 24.

First imaging unit 21, the second imaging section 22 and the third image pickup unit 23 is arranged in the same way as the first imaging unit 11 shown in FIG. That is, each imaging unit, the optical axis of the imaging device is arranged so as to intersect with the center axis.

The capsule endoscope 30 shown in FIG. 7 (b) includes a first imaging unit 31, and the second imaging unit 32, and the third image pickup unit 33, and the fourth imaging unit 34, and the light emitting portion 35, a . Emitting unit 35 is disposed in the center of the main body portion. The first imaging unit 31, the second imaging unit 32, the third image pickup unit 33 and the fourth imaging unit 34 is arranged so as to surround the light emitting unit 35.

The first imaging unit 31, the second imaging unit 32, the third image pickup unit 33 and the fourth imaging unit 34 is arranged in the same way as the first imaging unit 11 shown in FIG. That is, each imaging unit, the optical axis of the imaging device is arranged so as to intersect with the center axis.

By having a plurality of image pickup unit, the imaging range at the time of imaging by a single imaging unit, it can be resolved by the imaging unit. Then, in each imaging unit, it is possible to increase the imaging magnification of the imaging optical system. Therefore, it is possible to perform a more detailed observations. Further, it is possible to achieve both a wide range observation and detailed observation.

In the capsule endoscope of the present embodiment, the first imaging unit has a first entrance surface located closest to the transparent cover, the light emitting portion is located closest to the transparent cover injection having a surface, a curve having two focal points, a part of an ellipse, the minor axis of the ellipse coincides with the center axis, it is preferable to satisfy the following conditional expression (14).
0.1 ≦ zb / ra ≦ 1.0 (14)
here,
zb is a distance to the exit surface from a virtual plane including a first entrance surface, the direction of the distance along the optical axis of the first imaging optical system,
ra is, ellipse of long radius,
It is.

In Figure 6, the surface including a first entrance surface 13 PL3 (hereinafter, referred to as "surface PL3"), a distance zb from the surface PL3 to the exit surface 7, and is shown. Distance zb is the distance along the optical axis AXp1 of the first imaging optical system. In the light emitting unit 5, the exit surface 7 is parallel to the plane PL3.

By satisfying conditional expression (14), the distance between the transparent cover and the imaging unit can be shortened. Therefore, it is possible to shorten the overall length of the capsule endoscope. In addition, the occurrence of the flare, can be suppressed more effectively.

In the capsule endoscope of the present embodiment, the lens disposed on the most object side of the imaging optical system is preferably a positive lens.

In this way, the main point position can be located on the object side. Therefore, it is possible to shorten the overall length of the imaging unit. As a result, it is possible to shorten the overall length of the capsule endoscope.

In the capsule endoscope of the present embodiment, the lens disposed on the most object side of the imaging optical system is preferably a negative lens.

In this way, the entrance pupil can be located on the object side. Therefore, it is possible to reduce the area of ​​the opening. As a result, it increases the degree of freedom in the arrangement of the image pickup unit, and further, it is possible to suppress the incidence of the imaging portion of the reflected light in the transparent cover.

The capsule endoscope of this embodiment has a side-emitting portion, the side surface light emitting unit is disposed on a side surface of the main body portion, it is preferable to satisfy the following condition (15).
70 ° ≦ ε ≦ 110 ° (15)
here,
ε is the angle between the lamp axis of the lamp axis and side-emitting portion of the light emitting portion,
It is.

A schematic configuration of a capsule endoscope of the embodiment shown in FIG. 8. Figure 8 is a schematic configuration in a plane including the central axis.

The capsule endoscope 40 includes a main body 41, a bottom 42, a transparent cover 43, a first imaging optical system 44, the first image sensor 45, the second imaging optical system 46, the second imaging element 47 When having the light emitting portion 48, a first side-emitting portion 49a, a second side surface light emitting unit 49b, a.

In the capsule endoscope 40, on one side of the main body portion 41, the transparent cover 43 is disposed. On the other side of the main body portion 41, bottom portion 42 is formed. Shape of the bottom portion 42 is Ryakuwan shape. Bottom 42, it is formed integrally with the main body portion 41 may be formed separately from the main body portion 41.

In the first imaging optical system 44 and the first imaging element 45, the first imaging unit is configured. In the second imaging optical system 46 and the second imaging element 47, the second imaging unit is configured.

Emitting unit 48 is disposed at a position including the central axis AXc. In the light-emitting unit 48, the light emitting region is oriented in the direction of the transparent cover 43. An axis that indicates the direction in which the light-emitting region is facing, if the lamp axis of the light emitting portion 48, Akarijiku emitting portion 48 is a central axis AXc a direction substantially parallel.

The first side-emitting portion 49a and the second side surface light emitting unit 49b are disposed on the outer peripheral surface of the main body portion 41. A lamp axis AXi1 of the first side-emitting portion 49a lamp axis AXi2 the second side surface light emitting unit 49b are both the central axis AXc substantially perpendicular direction. Therefore, the capsule endoscope 40, the conditional expression (15) is satisfied.

By satisfying conditional expression (15), it is possible to ensure sufficient brightness to the imaging range.

The capsule endoscope of this embodiment, the curve having two focal points, a part of an ellipse, it is preferable that the minor axis of the ellipse coincides with the center axis, satisfies the following conditional expression (16) .
0.01 ≦ Dt / ra ≦ 0.2 (16)
here,
Dt is the thickness on the center axis of the transparent cover,
ra is, ellipse of long radius,
It is.

In the capsule endoscope of the present embodiment, the imaging unit is to be located the center of the pupil of the imaging optical system between the outer peripheral surface of the focus and the main body portion, is disposed. On the other hand, the central axis of the transparent cover is substantially coincident with the central axis of the body portion. Therefore, with respect to the optical axis of the imaging optical system, the central axis of the transparent cover is in the state of being eccentric.

By not exceed an upper limit value of conditional expression (16), it is possible to suppress occurrence of decentering aberration. Therefore, even in the detailed observation, it is possible to secure good resolution performance.

By transparent cover is deformed, flare is generated. By not fall below a lower limit value of conditional expression (16), it is possible to suppress deterioration of the resolution performance with such flares.

The capsule endoscope of the present embodiment, it is preferable to satisfy the following condition (17).
ndc ≦ 1.7 (17)
here,
ndc is the refractive index at the d-line of the transparent cover material,
It is.

By satisfying conditional expression (17), it is possible to suppress reflection of the illumination light in the transparent cover. As a result, it is possible to suppress the occurrence of the flare.

In the capsule endoscope of the present embodiment, the effective diameter, it is preferable that the thickness of the transparent cover is uniform.

As described above, in the capsule endoscope of the present embodiment, with respect to the optical axis of the imaging optical system, the central axis of the transparent cover is in the state of being eccentric. Therefore, by equalizing the thickness of the transparent cover in effective diameter, it is possible to suppress occurrence of decentering aberration. Therefore, even in the detailed observation, it is possible to secure good resolution performance.

In the capsule endoscope of the present embodiment, the light beam effective diameter, the thickness of the transparent cover is preferably made thicker with distance from the central axis.

By doing so, widen the angle of view of the imaging optical system, it is possible to widen the illumination region of the light emitting portion.

The capsule endoscope of this embodiment has a plurality of lenses, or perform imaging by using all of the plurality of lenses, or, it is preferable to perform imaging by using a part of a plurality of lenses.

In this way, it is possible to perform the stereo photography. As a result, it is possible to more detailed observations.

The capsule endoscope of the present embodiment, on the other side of the main body portion, and another transparent cover and transparent cover, and another of the imaging unit and the imaging unit, and the other light emitting portion and the light emitting portion, a it is preferred to have.

A schematic configuration of a capsule endoscope of the embodiment shown in FIG. Figure 9 is a schematic configuration in a plane including the central axis. The same reference numerals denote the same configuration as FIG. 8, description will be omitted.

The capsule endoscope 50 includes a transparent cover 51, and the third imaging optical system 52, and the third image pickup element 53, and a fourth imaging optical system 54, a fourth image sensor 55, and the light emitting portion 56, a .

In the capsule endoscope 50, as well as one transparent cover 43 on the side of the main body portion 41 is disposed, a transparent cover 51 is disposed on the other side of the main body portion 41.

In the third imaging optical system 52 and the third imaging element 53, the third image pickup unit is constituted. In the fourth imaging optical system 54 and the fourth image sensor 55, the fourth imaging unit is configured.

The capsule endoscope 50, the one imaging unit which is arranged on the side of another of the imaging unit is disposed on the other side. Further, the light emitting unit disposed on one side of another of the light emitting portion is disposed on the other side. Therefore, it is possible to take a wider range.

The capsule endoscope of this embodiment has a plurality of light emitting portions, in each of the light emitting portion, the wavelength spectrum may be different.

In the capsule endoscope of the present embodiment, the light emitting unit may have an illumination optical system.

Hereinafter, an example of a capsule endoscope according to the present embodiment will be described in detail with reference to the drawings. It should be understood that the present invention is not limited by this embodiment.

The cross-sectional views of a capsule endoscope of Embodiment 1 shown in FIG. 10. FIG. 10 (a) shows the internal state of the plane including the central axis. FIG. 10 (b) shows the internal state in a plane perpendicular to the center axis.

The capsule endoscope of the first embodiment includes a transparent cover C, a imaging optical system OBJ, a light emitting unit ILL, a.

Both surfaces of the transparent cover C is a semi-elliptical surface. The number of the light emitting portion ILL the number of the imaging optical system OBJ is one each. Emitting portion ILL is disposed in the center of the main body portion, the imaging optical system OBJ are arranged in the periphery of the main body portion.

Emitting portion ILL is arranged such lamp axis is parallel to the central axis AXc. The imaging optical system OBJ, an optical axis AXp is arranged parallel to the central axis AXc.

The imaging optical system OBJ, in order from the object side, a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, the a a double-convex positive lens L3, and a positive meniscus lens L4 having a convex surface directed toward the object side It has a. The aperture stop S is disposed between the biconvex positive lens L2 and a biconvex positive lens L3.

Aspheric surface is provided and the image side surface of the negative meniscus lens L1, the object side surface of the biconvex positive lens L2, the the image side surface of a double-convex positive lens L3, both surfaces of the positive meniscus lens L4, the total five surfaces of .

The cross-sectional views of a capsule endoscope of Embodiment 2 shown in FIG. 11. Figure 11 shows the interior of state in the plane including the central axis.

The capsule endoscope of Embodiment 2 includes a transparent cover C, and an imaging optical system OBJ1, an imaging optical system OBJ2, a light emitting unit ILL, a.

Both surfaces of the transparent cover C is a semi-elliptical surface. The number of the imaging optical system OBJ 2 Tsude, the number of the light emitting portion ILL is one. Emitting portion ILL is disposed in the center of the main body portion, the imaging optical system OBJ1 and the imaging optical system OBJ2 are both are arranged around the main body portion.

Emitting portion ILL is arranged such lamp axis is parallel to the central axis AXc. The imaging optical system OBJ1 and the imaging optical system OBJ2 are both optical axes AXp is arranged parallel to the central axis AXc.

The imaging optical system OBJ1 and the imaging optical system OBJ2 is the same as the imaging optical system OBJ of the first embodiment.

The cross-sectional views of a capsule endoscope of Embodiment 3 shown in FIG. 12. FIG. 12 (a) shows the internal state of the plane including the central axis. FIG. 12 (b) shows the internal state in a plane perpendicular to the center axis.

The capsule endoscope of the third embodiment includes a transparent cover C, a imaging optical system OBJ, a light emitting unit ILL, a.

Both surfaces of the transparent cover C is a semi-elliptical surface. The number of the light emitting portion ILL the number of the imaging optical system OBJ is one each. Emitting portion ILL is disposed in the center of the main body portion, the imaging optical system OBJ are arranged in the periphery of the main body portion.

Emitting portion ILL is arranged such lamp axis is parallel to the central axis AXc. The imaging optical system OBJ, an optical axis AXp is arranged parallel to the central axis AXc.

The imaging optical system OBJ, in order from the object side, a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, the negative meniscus lens L3 having a convex surface directed toward the image side. The aperture stop S is disposed between the negative meniscus lens L1 and the biconvex positive lens L2.

Aspheric surface is provided and the image side surface of the negative meniscus lens L1, both surfaces of the biconvex positive lens L2, the the image side surface of the negative meniscus lens L3, total four surfaces of.

The cross-sectional views of a capsule endoscope of Embodiment 4 shown in FIG. 13. Figure 13 shows the interior of state in the plane including the central axis.

The capsule endoscope of the fourth embodiment includes a transparent cover C, a imaging optical system OBJ, a light emitting unit ILL, a.

Both surfaces of the transparent cover C is a semi-elliptical surface. The number of the light emitting portion ILL the number of the imaging optical system OBJ is one each. Emitting portion ILL is disposed in the center of the main body portion, the imaging optical system OBJ are arranged in the periphery of the main body portion.

Emitting portion ILL is arranged such lamp axis is parallel to the central axis AXc. The imaging optical system OBJ, an optical axis AXp is arranged parallel to the central axis AXc.

The imaging optical system OBJ, in order from the object side, a negative meniscus lens L1 having a convex surface directed toward the object side, a biconvex positive lens L2, the directed positive meniscus lens L3 having a convex surface directed toward the image side, a convex surface on the object side It has been a negative meniscus lens L4, a. The aperture stop S is disposed between the biconvex positive lens L2 and a positive meniscus lens L3.

Aspheric surface is provided and the image side surface of the negative meniscus lens L1, the image side surface of the positive meniscus lens L3, a total of four surfaces of the both surfaces of the negative meniscus lens L4,.

The cross-sectional views of a capsule endoscope of Embodiment 5 shown in FIGS. 14 and 15. Figure 14 shows the interior of state in the plane including the central axis. Figure 15 is an enlarged view of the imaging optical system.

The capsule endoscope of Embodiment 5 includes a transparent cover C1, the imaging optical system OBJ1, an imaging optical system OBJ2, a light emitting unit ILL, a.

Both surfaces of the transparent cover C is a semi-elliptical surface. The number of the light emitting portion ILL the number of the imaging optical system OBJ is two together. Emitting portion ILL is disposed in the center of the main body portion, the imaging optical system OBJ1 and the imaging optical system OBJ2 are both are arranged around the main body portion.

Emitting portion ILL the lamp axis is arranged to intersect the central axis AXc. The imaging optical system OBJ1 and the imaging optical system OBJ2 are both optical axes AXp are arranged to intersect with the center axis AXc.

The imaging optical system OBJ, in order from the object side, a biconvex positive lens L1, a plano-concave negative lens L2, the positive meniscus lens L3 having a convex surface directed toward the image side, a plano-concave negative lens L4, a. The aperture stop S is disposed on the object side of the biconvex positive lens L1. Between the plano-concave negative lens L4 and the image plane I, a cover glass C2 is arranged.

Hereinafter, numerical data of each embodiment described above. In the surface data, r represents the radius of curvature of each lens surface, d is the spacing between the lens surfaces, nd is the refractive index of the d-line of each lens, [nu] d is Abbe number of each lens, * mark is an aspherical surface.

Further, in the various data, f is the focal length of the entire system, omega denotes a half angle, the IH is image height, FNO. Is an F-number.

The non-spherical shape, the optical axis z, a direction perpendicular to the optical axis taken y, the conical coefficient k, the aspherical coefficients A4, A6, A8, A10, when A12 ... and, by the following formula expressed.
z = (y 2 / r) / [1+ {1- (1 + k) (y / r) 2} 1/2]
+ A4y 4 + A6y 6 + A8y 8 + A10y 10 + A12y 12 + ...
Further, in the aspherical surface coefficients, "E-n" (n is an integer) indicates a "10 -n". Symbols of these various values ​​are common in numerical data of Examples below.

Numerical Examples 1 and 2
Unit mm

Surface data Surface number r d nd νd
The object plane ∞ ∞
1 * 7.446 0.371 1.585 30
2 * 7.001 5.838
3 61.844 0.47 1.5311 56
4 * 0.742 0.633
5 * 2.117 1.042 1.635 23.9
6 -3.546 0.049
7 ∞ (aperture) 0.116
8 15.633 0.63 1.5311 56
9 * -1.049 0.14
10 * 2.752 0.618 1.5311 56
11 * 3.144 1.051
The image plane ∞

Aspherical surface data first surface
k = 0.2
The second surface
k = 0.2
The fourth surface
k = -0.732
The fifth surface
k = 0.000, A4 = -0.247
Ninth surface
k = 0.000, A4 = -0.061, A6 = 0.506
Tenth surface
k = 0.000, A4 = -0.228, A6 = 0.033
The eleventh surface
k = 0.000, A4 = -0.169, A6 = -0.019, A8 = -0.016

Various types of data f 1
2ω 130
IH 1.12
FNO. 4.5

Numerical Example 3
Unit mm

Surface data Surface number r d nd νd
The object plane ∞ ∞
1 * 8.131 0.624 1.585 30
2 * 7.256 4.371
3 49.957 0.437 1.5311 56
4 * 0.826 0.901
5 ∞ (aperture) 0.092
6 * 2.595 0.59 1.635 23.9
7 * -0.868 0.062
8 -7.323 0.5 1.5311 56
9 * -8.423 1.4
The image plane ∞

Aspherical surface data first surface
k = 0.4
The second surface
k = 0.4
The fourth surface
k = 0.000, A4 = -0.234, A6 = 0.077
Sixth surface
k = 0.000, A4 = 0.435, A6 = -1.875
Seventh surface
k = 0.000, A4 = 0.487
Ninth surface
k = 0.000, A4 = 0.037, A6 = 0.063

Various types of data f 1
2ω 120
IH 1.07
FNO. 4.3

Numerical Example 4
Unit mm

Surface data Surface number r d nd νd
The object plane ∞ ∞
1 * 7.452 0.364 1.585 30
2 * 6.864 5.5
3 60.637 0.441 1.5311 56
4 * 0.728 0.588
5 * 15.781 0.882 1.635 23.9
6 -1.896 0.049
7 ∞ (aperture) 0.098
8 -29.543 0.618 1.5311 56
9 * -0.824 0.137
10 * 1.382 0.608 1.5311 56
11 * 0.705 0.985
The image plane ∞

Aspherical surface data first surface
k = 0.2
The second surface
k = 0.2
The fourth surface
k = 0.987
The fifth surface
k = 0.000, A4 = 0.109
Ninth surface
k = 0.000, A4 = -0.295, A6 = 0.11
Tenth surface
k = 0.000, A4 = -0.505, A6 = -0.076
The eleventh surface
k = 0.000, A4 = -0.988, A6 = -0.1, A8 = 2.89E-03

Various types of data f 1
2ω 130
IH 0.91
FNO. 4.9

Numerical Example 5
Unit mm

Surface data Surface number r d nd νd
The object plane ∞ ∞
1 * 7.91 0.2 1.59 30
2 * 7.69 4
3 ∞ (aperture) -0.809
4 * 0.901 0.383 1.5305 55.7
5 * -2.493 0.023
6 * ∞ 0.174 1.634 24
7 * 1.44 0.249
8 * -1.131 0.342 1.5305 55.7
9 * -0.375 0.031
10 * ∞ 0.264 1.5305 55.7
11 * 0.488 0.425
12 ∞ 0.18 1.51633 64.1
13 ∞ 0.343
The image plane ∞

Aspherical surface data first surface
k = 0.1
The second surface
k = 0.1
The fourth surface
k = 0.114, A4 = -0.29151396, A6 = 2.3581128, A8 = -48.569499,
A10 = 314.37057, A12 = -863.95816
The fifth surface
k = -59.568, A4 = -0.58501645, A6 = -9.5685171, A8 = 48.402206,
A10 = 151.47177, A12 = -938.08007
Sixth surface
k = 0.000, A4 = 0.094848455, A6 = -11.893684, A8 = 58.185908,
A10 = 148.00698, A12 = -755.63172
Seventh surface
k = -3.194, A4 = 0.59870838, A6 = -3.6506976, A8 = 11.160053,
A10 = -14.830006, A12 = 141.4102
The eighth surface
k = -4.557, A4 = -0.46819278, A6 = 2.4717458, A8 = -2.4978831,
A10 = -2.2760385, A12 = -72.294739
Ninth surface
k = -3.126, A4 = -1.0401939, A6 = 2.0588846, A8 = 0.37197606,
A10 = 21.235709, A12 = -44.214973
Tenth surface
k = 0.000, A4 = -0.67695487, A6 = 0.53465864, A8 = 1.0518579,
A10 = -1.4108677, A12 = 0.28622263, A14 = 0.13521064
The eleventh surface
k = -8.223, A4 = -0.76835953, A6 = 1.2955772, A8 = -2.0585815,
A10 = 2.0984017, A12 = -1.2869036, A14 = 0.36112621

Various types of data f 1.8
2ω 37
IH 1.4
FNO. 5.5

Next, it listed the values ​​of the conditional expressions in each example below. Incidentally, - (hyphen) indicates no configuration applicable.

Example 1 Example 2 Example 3
(1) (Lc-La3) / La1 0.03 0.03 0.07
(2) (Zc-Zb) / La1 0.04 0.07 0.12
(3) Zc / La1 0.00 0.00 0.12
(4) 1-rb / ra 0.09 0.09 0.15
(5), (6) (La3-Lb-
| Z'b | × tanθb) / ra 0.72 0.36 1.17
(7) Lb / Lc 0.63 0.67 0.61
(8) Lb / La3 0.68 0.72 0.68
(9) (ra-La3) / (2 × IH) 1.81 1.81 1.50
(10) (ra-La3) / Φc 1.26 1.26 2.13
(11) θc_1 130.0 130.0 120.0
(12) θc_2 - 130.0 -
(14) zb / ra - - -
(16) Dt / ra 0.05 0.05 0.09

Example 4 Example 5
(1) (Lc-La3) / La1 0.10 0.23
(2) (Zc-Zb) / La1 - -
(3) Zc / La1 0.03 -
(4) 1-rb / ra 0.09 0.05
(5), (6) (La3-Lb-
| Z'b | × tanθb) / ra - -0.33
(7) Lb / Lc - 0.38
(8) Lb / La3 - 0.66
(9) (ra-La3) / (2 × IH) 2.20 1.88
(10) (ra-La3) / Φc 2.68 5.27
(11) θc_1 130.0 70.0
(12) θc_2 - 70.0
(14) zb / ra - 0.20
(16) Dt / ra 0.05 0.03

Next, it listed the values ​​of the parameters in each example below. Incidentally, - (hyphen) indicates no configuration applicable.
Example 1 Example 2 Example 3
La1 (ra) 6.8 6.8 6.9
La2 (rb) 6.2 6.2 5.8
La3 2.8 2.8 3.7
Lb 1.9 2.0 2.5
Lc 3.0 3.0 4.1
Zb -0.3 -0.5 0.0
| Z'b | 0.3 0.5 0.0
Zc 0.0 0.0 0.8
tanθb 75.0 80.0 70.0
IH 1.1 1.1 1.1
θc_1 130.0 130.0 120.0
θc_2 - 130.0 -
Dt 0.4 0.4 0.6
ndc 1.585 1.585 1.585
Φc 3.2 3.2 1.5
zb - - -

Example 4 Example 5
La1 (ra) 6.8 7.5
La2 (rb) 6.2 7.2
La3 2.8 2.3
Lb - 1.5
Lc 3.4 4.0
Zb - -
| Z'b | - 1.5
Zc 0.2 -
tanθb - 80.0
IH 0.9 1.4
θc_1 130.0 70.0
θc_2 - 70.0
Dt 0.4 0.2
ndc 1.585 1.585
Φc 1.5 1.0
zb - 1.5

The present invention may take various modifications without departing from its spirit.

As described above, the present invention is less image is obtained flare, suitable for the entire length is shorter capsule endoscope.

1 capsule endoscope 2 main body 3, 3 'a transparent cover 4, 4' imaging unit 5 light-emitting part 6 entrance surface 7 exit surface 10 capsule endoscope 11 first imaging unit 12 the projections 20 the capsule endoscope 21 first imaging unit 22 and the second imaging unit 23 third image pickup unit 24 emitting unit 30 the capsule endoscope 31 first imaging unit 32 and the second imaging section 33 third image pickup unit 34 fourth imaging unit 35 emitting portion 40 capsule the endoscope 41 body portion 42 bottom 43 transparent cover 44 first imaging optical system 45 the first image sensor 46 and the second imaging optical system 47 the second image sensor 48 emitting portion 49a first side surface light emitting unit 49b second side surface light emitting unit 50 capsule type endoscope 51 transparent cover 52 third imaging optical system 53 third image sensor 54 fourth imaging optical system 55 the fourth image sensor 56 emitting portion AXc center axis AXp first axis, the optical axis AXf second axis AX p1 of the first imaging optical system in the optical axis AXi1 first side surface light emitting unit lights axis AXi2 the second side surface light emitting unit lights axis Pf focal Pf 'position Pp imaging optical system plane PL2 given including the center PL1 2 one focus of the pupil of of distance between points on the periphery of the radial La2 central axis and a curved region in the curve with the surface La1 2 two focus including the surface PL3 first entrance surface, smallest distance La3 the second axis and the central axis of distance between the distance Lb central axis each point on the outer edge of the light emitting region, the distance Z'b face PL1 from distance Zb predetermined surface of the first axis and the center axis spacing Lc of the maximum to the exit surface angle OBJ between the distance θb central axis and a predetermined direction to the exit surface from a distance zb surface PL3 to the entrance surface from the distance Zc predetermined surface to the exit surface, OBJ1, OBJ2 imaging optical system L1, L2, L3, L4 lens I LL emitting portion I image plane S aperture stop C, C1 transparent cover C2 coverslip

Claims (26)

  1. And the column of the main body portion,
    And a transparent cover,
    An imaging unit having an imaging optical system,
    And a light emitting unit having a light emitting region,
    The transparent cover, the imaging unit and the light emitting portion is provided on one side of the main body portion,
    The transparent cover has a curved region,
    The curved surface region is positioned to intersect the central axis of said body portion,
    One of the intersection line formed by a plane and the curved surface area including the center axis is a curve having two focal points,
    So that a predetermined area does not include the two focal points, the light emitting portion is disposed,
    The imaging unit, the capsule endoscope, characterized by being arranged at a position that satisfies the following conditional expression (1).
    0 ≦ (Lc-La3) /La1≦0.5 (1)
    here,
    Region when the predetermined area, the light emitting area of ​​the light emitting portion, which is projected on a plane including the two focal points,
    Lc is a distance between the central axis and the first axis,
    La1 is a radius in the curve with the two focal points,
    La3, the distance between the central axis and second axis,
    The first axis passes through the center of the pupil of the imaging optical system, the central axis parallel to the axis,
    The second axis passes through the focal point, the central axis parallel to the axis,
    It is.
  2. A plurality of the imaging unit,
    Wherein each of the plurality of imaging unit, the capsule endoscope according to claim 1, characterized in that it is arranged so as to satisfy the conditional expression (1).
  3. The imaging unit has an incident surface which is located closest to the transparent cover,
    The light emitting portion has an exit surface located closest to the transparent cover,
    The imaging unit, the first axis and said central axis is arranged parallel,
    In the direction along the central axis, the incident plane, the capsule endoscope according to claim 1, characterized in that than the exit surface is located on the transparent cover side.
  4. The imaging unit has an incident surface which is located closest to the transparent cover,
    The light emitting portion has an exit surface located closest to the transparent cover,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (2).
    0.01 ≦ (Zc-Zb) /La1≦1.0 (2)
    here,
    Zc is the distance from the predetermined surface to the incident surface,
    Zb is the distance from the predetermined surface to said exit surface,
    La1 is a radius in the curve with the two focal points,
    The predetermined surface is perpendicular to the central axis, and the surface including the center of the pupil of the imaging optical system,
    Distance direction the distance along said central axis,
    Sign of the distance, the direction toward the transparent cover from the predetermined surface is positive,
    It is.
  5. The imaging unit has an incident surface which is located closest to the transparent cover,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (3).
    -0.5 ≦ Zc / La1 ≦ 0.5 (3)
    here,
    Zc is the distance from the predetermined surface to the incident surface,
    La1 is a radius in the curve with the two focal points,
    The predetermined surface is perpendicular to the central axis, and the surface including the center of the pupil of the imaging optical system,
    Distance direction the distance along said central axis,
    Sign of the distance, the direction toward the transparent cover from the predetermined surface is positive,
    It is.
  6. Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (4).
    0 ≦ 1-rb / ra ≦ 0.9 (4)
    here,
    ra is the long radius of the ellipse,
    rb is short radius of the ellipse,
    It is.
  7. The light emitting portion has an exit surface located closest to the transparent cover,
    Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The light emitting unit, the capsule endoscope according to claim 1, as well as positioned inside the first predetermined circle, and satisfies the following conditional expression (5).
    -0.1 ≦ (La3-Lb- | Z'b | × tanθb) /ra≦0.7 (5)
    here,
    La3, the distance between the central axis and the second axis,
    Lb is an interval between each point on the outer edge of said central axis said light emitting region, the interval with the maximum,
    Z'b the distance from the plane including the two focal points to the exit surface,
    θb is the angle between the central axis and a predetermined direction,
    ra is the long radius of the ellipse,
    Said first predetermined circle, the center is located on the central axis, the circle of the distance La3 radius,
    The predetermined direction is a direction which becomes 0.1 × LI,
    LI is the direction of the light intensity along the central axis,
    It is.
  8. The light emitting portion has an exit surface located closest to the transparent cover,
    Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The light emitting portion is configured to positioned inside the first predetermined circle, satisfies the following conditional expression (6),
    The capsule endoscope according to claim 1 in which a part of the light emitted from the light emitting region, characterized in that the light is blocked.
    (La3-Lb- | Z'b | × tanθb) / ra <0.05 (6)
    here,
    La3, the distance between the central axis and the second axis,
    Lb is an interval between each point on the outer edge of said central axis said light emitting region, the interval with the maximum,
    Z'b the distance from the plane including the two focal points to the exit surface,
    θb is the angle between the central axis and a predetermined direction,
    ra is the long radius of the ellipse,
    Said first predetermined circle, the center is located on the central axis, the circle of the distance La3 radius,
    The predetermined direction is a direction which becomes 0.1 × LI,
    LI is the direction of the light intensity along the central axis,
    It is.
  9. The light emitting unit, the capsule endoscope according to claim 1, as well as located inside the second predetermined circle, and satisfies the following conditional expression (7).
    0 ≦ Lb / Lc ≦ 0.8 (7)
    here,
    Lb is an interval between each point on the outer edge of said central axis said light emitting region, the interval with the maximum,
    Lc is a distance between the central axis and said first axis,
    Said second predetermined circle, the center is located on the central axis, the circle of the distance La3 radius,
    It is.
  10. The light emitting unit, the capsule endoscope according to claim 1, as well as positioned inside the first predetermined circle, and satisfies the following conditional expression (8).
    0 ≦ Lb / La3 ≦ 0.9 (8)
    here,
    La3, the distance between the central axis and the second axis,
    Lb is an interval between each point on the outer edge of said central axis said light emitting region, the interval with the maximum,
    Said first predetermined circle, the center is located on the central axis, the circle of the distance La3 radius,
    It is.
  11. The shape of the curved surface region, the capsule endoscope according to claim 1, characterized in that with respect to the central axis which is point-symmetrical shape.
  12. Wherein a curved region shaped line of intersection formed by the plane including the two focal points, the capsule endoscope according to claim 1, characterized in that a circle.
  13. Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (9).
    0.4 ≦ (ra-La3) / (2 × IH) ≦ 12.5 (9)
    here,
    ra is the long radius of the ellipse,
    La3, the distance between the central axis and the second axis,
    IH is image height in the imaging optical system,
    It is.
  14. The imaging unit has an incident surface which is located closest to the transparent cover,
    Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (10).
    1.0 ≦ (ra-La3) /Φc≦6.0 (10)
    here,
    ra is the long radius of the ellipse,
    La3, the distance between the central axis and the second axis,
    Φc is the opening diameter in the incident surface,
    It is.
  15. Has a plurality of the imaging unit,
    Said plurality of image pickup unit includes a first image pickup unit satisfies the following conditional expression (11), a second imaging unit that satisfies the following conditional expression (12), a
    The capsule endoscope according to claim 1, characterized in that it comprises an imaging range of the respective imaging portions overlap with other imaging unit and the object side of the transparent cover.
    60 ° ≦ θc_1 ≦ 140 ° (11)
    60 ° ≦ θc_2 ≦ 140 ° (12)
    here,
    The θc_1 the angle of view of the imaging optical system of the first image pickup unit,
    The θc_2 the angle of view of the imaging optical system of the second image pickup unit,
    It is.
  16. On the other side of the main body portion, a convex portion is provided,
    Has a plurality of the imaging unit,
    The plurality of imaging unit includes a first image pickup unit having a first imaging optical system, a second imaging unit having a second imaging optical system, and
    Some of the imaging range of the first imaging section, overlaps the imaging range of the second image pickup unit,
    The first image pickup unit, the optical axis of the first imaging optical system is arranged so as to intersect the central axis,
    The second image pickup unit, the optical axis of the second imaging optical system is arranged so as to intersect the central axis,
    The first intersection of the imaging optical system of the optical axis and said central axis, and the intersection of the optical axis and the central axis of the second imaging optical system are both the convex than the plane including the two focal the capsule endoscope according to claim 1, characterized in that located in the part side.
  17. The first image pickup unit has a first entrance surface located closest to the transparent cover,
    The light emitting portion has an exit surface located closest to the transparent cover,
    Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The capsule endoscope according to claim 16, characterized by satisfying the following conditional expression (14).
    0.1 ≦ zb / ra ≦ 1.0 (14)
    here,
    zb, the first a distance from the virtual plane including an incident surface to said exit surface, the direction of the distance along the optical axis of the first imaging optical system,
    ra is the long radius of the ellipse,
    It is.
  18. The capsule endoscope according to claim 1 lens disposed closest to the object side of the imaging optical system, which is a positive lens.
  19. The capsule endoscope according to claim 1, wherein the lens disposed closest to the object side of the imaging optical system is a negative lens.
  20. Has a side-emitting portion,
    The side-emitting portion is disposed on a side surface of the main body portion,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (15).
    70 ° ≦ ε ≦ 110 ° (15)
    here,
    ε is the angle between the lighting axes of the side-emitting portion and the lamp axis of the light emitting portion,
    It is.
  21. Curve having the two focal points are part of an ellipse,
    The minor axis of the ellipse coincides with the central axis,
    The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (16).
    0.01 ≦ Dt / ra ≦ 0.2 (16)
    here,
    Dt is the thickness on the central axis of the transparent cover,
    ra is the long radius of the ellipse,
    It is.
  22. The capsule endoscope according to claim 1, characterized by satisfying the following conditional expression (17).
    ndc ≦ 1.7 (17)
    here,
    ndc is the refractive index at the d-line of said transparent cover material,
    It is.
  23. In effective diameter, the capsule endoscope according to claim 1, wherein the thickness of the transparent cover is uniform.
  24. In light effective diameter, the thickness of the transparent cover, the capsule endoscope according to claim 1, characterized in that the thicker with distance from the central axis.
  25. A plurality of lenses,
    Wherein the plurality of either lens performs imaging by using all, or a capsule endoscope according to claim 1, using a portion of said plurality of lenses and performing imaging.
  26. Claims on the other side of the main body portion and with another transparent cover said transparent cover, and another imaging unit and the imaging unit, characterized in that it has a, and another of the light emitting portion and the light emitting portion the capsule endoscope according to claim 1.
PCT/JP2017/017531 2017-05-09 2017-05-09 Capsule-type endoscope WO2018207254A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/017531 WO2018207254A1 (en) 2017-05-09 2017-05-09 Capsule-type endoscope

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/017531 WO2018207254A1 (en) 2017-05-09 2017-05-09 Capsule-type endoscope

Publications (1)

Publication Number Publication Date
WO2018207254A1 true WO2018207254A1 (en) 2018-11-15

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003501704A (en) * 1999-06-15 2003-01-14 ギブン・イメージング・リミテッド Optical system
JP2003325441A (en) * 2002-03-08 2003-11-18 Olympus Optical Co Ltd Capsule endoscope
JP2005503182A (en) * 2001-01-16 2005-02-03 ギブン・イメージング・リミテツド System and method for wide-area imaging of the body cavity
JP2006043115A (en) * 2004-08-04 2006-02-16 Olympus Corp Capsule endoscope
JP2007007007A (en) * 2005-06-29 2007-01-18 Olympus Medical Systems Corp Endoscope

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003501704A (en) * 1999-06-15 2003-01-14 ギブン・イメージング・リミテッド Optical system
JP2005503182A (en) * 2001-01-16 2005-02-03 ギブン・イメージング・リミテツド System and method for wide-area imaging of the body cavity
JP2003325441A (en) * 2002-03-08 2003-11-18 Olympus Optical Co Ltd Capsule endoscope
JP2006043115A (en) * 2004-08-04 2006-02-16 Olympus Corp Capsule endoscope
JP2007007007A (en) * 2005-06-29 2007-01-18 Olympus Medical Systems Corp Endoscope

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