JPH09218356A - Optical device and lighting head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the lighting device for a small-sized enlargement image pickup device which enables the surface of an object close to a mirror surface to be observed without using an enlargement image pickup device dedicated to top lighting. SOLUTION: A 2nd light guide means 1 is equipped with a 1st reflecting surface 11 and a 2nd reflecting surface 12. The 1st reflecting surface 11 reflects illumination light L emitted from the tip part of a 1st light guide means 106 inwardly in a radial direction of a case. The 2nd reflecting surface 12 reflects the illumination light L from the 1st reflecting surface 11 almost in parallel to the optical axis Lc of a lens unit 103 nearby the optical axis Lc and projects it on an observation window 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical device for picking up an image of an object and displaying a magnified image on a monitor, and more particularly to an illumination head for guiding light to the object.

[0002]

2. Description of the Related Art FIG. 16 shows a general example of this type of optical device (enlarged image pickup device). In FIG. 16, case 1
Reference numeral 00 designates a tubular shape as a whole, and includes an image pickup section 102 that houses a CCD (image pickup element) 101, a lens section 104 to which a lens unit 103 for image formation is attached, and an illumination head 105 attached to the lens section 104. It is composed of. At the rear end of the case 100, an optical fiber (first light guide means) 1
A stack of 06 has been inserted. The optical fibers 106 are dispersed in the image pickup unit 102 and are dispersed in the lens unit 104 of FIG.
Are arranged in a ring shape along the outer peripheral portion of and substantially parallel to the optical axis Lc, so that a circular light flux that is substantially parallel to the axis line La is emitted. Illumination light L from the optical fiber 106 is reflected by, for example, a reflection surface (second light guide means) 107 formed in the illumination head 105, and emitted from the observation window 111 of the illumination head 105 toward the surface F of the object. To be done. The reflected light L1 from the object is the lens unit 10 of FIG.
The image signal enters the CCD 101 through the cable 3, and is output to the controller (not shown) of the monitor through the cable 108. The magnifying imaging device obtains an annular light flux by arranging the optical fiber 106 in an annular shape on the outer peripheral portion of the lens unit 104 so that, for example, a shadow is not formed on the object surface F.

By the way, in this kind of magnifying image pickup apparatus, it is necessary to perform appropriate illumination according to the state of the surface of the object, and the incident light projected perpendicularly to the surface of the object and the surface of the object. It is necessary to properly set the balance (intensity ratio) with the side light projected obliquely. Therefore, in the magnified image pickup apparatus, the illumination head 105 is detachably provided in the lens unit 103, and the illumination head 105 is exchanged so that the balance between incident light and side incident light can be changed.

On the other hand, when the object surface F is close to a mirror surface,
As shown in FIG. 8, since the illumination light L is specularly reflected (specular reflection) on the object surface F, unless the illumination light L is incident substantially parallel to the optical axis Lc, the object surface F is emitted. The reflected light L1 does not sufficiently enter the CCD 101 (FIG. 16) and the screen becomes dark, so that the object surface F cannot be observed sufficiently.

Therefore, conventionally, an enlarged image pickup device dedicated to incident light shown in FIG. 18A is used. As shown in this figure, the magnified image pickup apparatus includes a half mirror 10 on the optical axis Lc.
9 is provided, and the illumination light L is guided from the side of the cylindrical case 100 to the half mirror 109 by the optical fiber 106A to project the incident light onto the surface of the object.

[0006]

However, in such a magnified image pickup apparatus, the cylindrical case 100 and the optical fiber 1 are used.
Since it is arranged in a direction orthogonal to 06A, the enlarged image pickup device becomes large. Further, since the light from the optical fiber 106A cannot be made into a circular luminous flux, a device dedicated to the incident light must be prepared. As shown in FIG. 18B, the reflection mirror 110 is provided to allow the optical fiber 106A
There is also a cable in which the cable 108 and the cable 108 are parallel to each other, but it is slightly larger than a general magnifying image pickup device (FIG. 16) and is dedicated to incident light. Therefore, it is necessary to prepare a device dedicated to incident light.

The present invention has been made in view of the above-mentioned problems of the prior art.
An object of the present invention is to provide a small-sized optical device capable of observing the surface of an object close to a mirror surface.

[0008]

The principle of the first invention according to claims 1 to 6 for achieving the above object will be described with reference to FIG. In the invention of claim 1, as shown in FIG. 7A, the second light guide means 1 includes a first reflection surface 11 and a second reflection surface 12. The first reflection surface 11 reflects the illumination light L emitted from the tip end portion of the first light guide means (not shown) toward the inside in the radial direction of the case. The second reflecting surface 12 is disposed near the optical axis Lc of the lens unit 103, reflects the illumination light L from the first reflecting surface 11, and reflects the illumination light L.
The illumination light L is emitted toward the object so that the optical axis L of the lens unit 103 is substantially parallel to the optical axis Lc of the lens unit 103, or is substantially parallel and intersects the optical axis Lc.

Since the lens unit 103 has a certain diameter, even if the illumination light L from the second reflecting surface 12 is not set on the optical axis Lc, as shown in this figure, the object The reflected light L1 from the surface F is the lens unit 1
The light is refracted at 03 and enters the image sensor 101. Therefore, even if the object surface F is a mirror surface, the specularly reflected light L1 is incident on the image sensor 101, and a sufficiently bright image can be obtained.

From the point O on the optical axis Lc on the object surface F in FIG. 7B and an arbitrary point P in the conical space S surrounded by the effective portion A of the objective lens 103a, O
The light emitted toward the point is specularly reflected at the point O and enters the objective lens 103a. On the other hand, the conical space S
Light emitted from other points P1 toward point O is specularly reflected at point O and does not enter the objective lens 103a. Therefore, when the second light guide means 1 is arranged in front of the objective lens 103a, at least a part of the second reflection surface 12 of the second light guide means 1 is originally the conical space S.
Must be within the range of.

However, since the position of the point O changes depending on the type of lens, it may be arranged at any position on the optical axis Lc. Therefore, considering the case where the point O is located at an infinite distance, in defining the scope of the right of the present invention, "the second reflecting surface 12 is disposed in the vicinity of the optical axis Lc" means " At least a part of the two reflecting surfaces 12 is arranged in a cylindrical space S1 having the effective portion (the portion within the effective aperture) A of the objective lens 103a as the bottom surface and the optical axis Lc as the axis line. " To do.

According to a fourth aspect of the present invention, the illumination head is arranged in at least a part of the circumference along the outer periphery of the illumination head, receives illumination light from the axial direction of the illumination head, and radially inward of the illumination head. Toward the first reflection surface, and the illumination light from the first reflection surface is reflected, and the optical axis of the reflected illumination light is substantially parallel to the axis line, or in a substantially parallel direction. And a second reflecting surface that emits the illumination light in a direction intersecting the axis, and at least a part of the second reflecting surface is in a cylindrical space having a radius of 1.0 mm and having the axis as the axis. It is arranged.

According to a fourth aspect of the present invention, there is provided a first illumination head alone.
It is provided to define the scope of rights of the invention. The effective aperture of the objective lens 103 in FIG. 7A is generally several meters.
Therefore, at least a part of the second reflecting surface 12 has a radius of 1.0 mm with the axis of the case as its axis.
It is necessary to be arranged in the cylindrical space S1 inside.

According to a sixth aspect of the present invention, the second light guide means is composed of an optical fiber arranged inward from the outer peripheral portion in the radial direction to the vicinity of the optical axis of the lens unit.
The illumination light from the light guide means is incident, and the optical axis of the illumination light is substantially parallel to the axis of the optical axis of the lens unit, or in a direction substantially parallel to the optical axis of the lens unit. The illumination light is guided so as to intersect with the object and emitted toward the object, and at least a part of the tip of the optical fiber has an effective portion of the objective lens of the lens unit as a bottom surface and an optical axis of the lens unit. It is characterized in that it is arranged in a cylindrical space whose axis is.

Next, the second aspect according to claim 7 to claim 11
The invention will be described. According to the invention of claim 7, the lens unit for image formation, the tip of the first light guiding means for illumination and the second light guiding means are provided in a cylindrical case, and the tip of the first light guiding means is provided. An optical device that is arranged on the circumference along the outer peripheral portion of the case, and emits at least a part of the illumination light from the first light guide means toward the object through the second light guide means. In the above, the second light guide means guides a part of the illumination light emitted from the tip end portion of the first light guide means to the radial center of the case, and on the optical axis of the lens unit. A half that is provided and reflects a part of the illumination light from the light guide member, directs the reflected illumination light toward the object along the optical axis, and passes a part of the reflected light from the object. It is equipped with a mirror.

According to the invention of claim 7, the illumination light from the first light guide means is guided to the radial center of the case by the light guide member of the second light guide means, and a part of the illumination light is reflected by the half mirror. Is reflected toward the object along the optical axis of the lens unit. The reflected light from the object passes through the half mirror and enters the lens unit. Since the illumination light is incident on the object along the optical axis, it is specularly reflected by the object,
Even if the surface of the object is a mirror surface, a sufficiently bright image can be obtained.

In the present invention, "directing the illumination light toward the object along the optical axis" means that the illumination light is emitted from the half mirror in parallel or substantially parallel to the optical axis of the lens unit. This means projecting incident light onto an object.

Further, if a light shielding member for shielding a part of the illumination light from the first light guide means is provided, the illumination light not incident on the second light guide means from the first light guide means is shielded, and an extra light is emitted. Since such light can be prevented from entering the image sensor, it is possible to prevent the image from becoming whitish and being deteriorated.

If the half mirror is provided in the illumination head, the object can be observed by exchanging the illumination head when side illumination is required, and at the time of observation by side illumination. Since the half mirror is removed, the image becomes clear.

According to a tenth aspect of the present invention, there is provided an illumination head having an observation window provided at the center in the radial direction at one end and a mounting portion at the other end, wherein the illumination light is directed inward in the radial direction. Is provided on an axis line passing through the center of the illumination head in the radial direction, and reflects a part of the illumination light from the light guide member,
And a half mirror for directing the reflected illumination light toward the object along the axis and passing a part of the reflected light from the object. The claim 10 is provided for defining the scope of the right of the second invention with respect to the lighting head alone.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the first invention of the present application will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional view showing a front end portion of the magnified image pickup apparatus according to the first embodiment. The lens section 104 of FIG.
The optical fiber (first light guide means) 106 is, as shown in FIG.
It is arranged on the circumference. At least a part of the illumination light L from the optical fiber 106 shown in FIG.
Through the observation window 20 of the illumination head 2 through the object surface F
Is emitted toward. The illumination head 2 has an observation window 20.
It is attached to the lens unit 104 by a female screw portion (attachment portion) 21 provided at the end portion on the side opposite to.

As shown in FIGS. 3 (a) and 3 (b), the second light guide means 1 is formed by vapor-depositing a metal film on a transparent member (eg acrylic) which is fan-shaped in plan view. The metal film is formed on a portion excluding the incident end surface 10 on the upper surface and the emitting end surface 16 on the lower surface. The second light guide means 1 includes the first and second reflecting surfaces 11,
12 and the first, second and third light guiding portions 13, 14, 15
Are integrally formed. The second light guide means 1 is fixed to the illumination head 2 by bonding the first reflection surface 11 to the illumination head 2 of FIG. First reflecting surface 11
Are arranged on the outer periphery of the illumination head 2, while the second reflecting surface 12 is arranged near the optical axis Lc. The first and second reflecting surfaces 11 and 12 are formed of, for example, a part of a conical curved surface.

Illumination light L emitted from the optical fiber 106
Enters from the incident end face 10 of the second light guide means 1 and is guided by the first light guide portion 13 substantially parallel to the optical axis Lc.
The reflecting surface 11 reflects the light inward in the radial direction of the illumination head 2. The illumination light L from the first reflecting surface 11 is
It is guided to the second reflecting surface 12 by the light guide portion 14. At least a part of the second reflecting surface 12 is arranged in the conical space S shown in FIG. 7B, and the illumination light L of FIG. 1 has the second reflecting surface 12 near the optical axis Lc. By the optical axis L
The light is reflected in a direction that is substantially parallel or substantially parallel to c and intersects the optical axis Lc, and passes through the third light guide portion 15 toward a point O on the optical axis Lc on the object surface F. That is,
The second reflecting surface 12 reflects the illumination light L from the first reflecting surface 11, and the optical axis L of the reflected illumination light L is the lens unit 10.
The illumination light L is emitted toward the object surface F so as to be substantially parallel to the optical axis Lc of the lens unit 3 or to be substantially parallel and intersect the optical axis Lc of the lens unit 103.

Therefore, the illumination light L is projected on the point O on the optical axis Lc on the object surface F and its vicinity. Since light is emitted with a certain solid angle,
Arrows L and L1 on the drawing indicate the center line (optical axis) of the light flux.

The third light guide portion 15 and the second reflecting surface 12
Are arranged radially outward of the illumination head 2 with respect to the optical axis Lc. This is because the image quality deteriorates when the second light guide means 1 is inserted up to the optical axis Lc.

Further, the optical axis L of the illumination light L from the third light guide portion 15 is substantially parallel to the optical axis Lc so as to cross the optical axis Lc at the point O toward the optical axis Lc side of the lens unit 103. It is preferable to emit the light. That is, it is preferable to project the illumination light L toward the intersection O with the optical axis Lc on the object surface F. This is to increase the amount of light near the observation point.
Since light is emitted with a solid angle as described above, the illumination light L may be emitted from the third light guide portion 15 completely parallel to the optical axis Lc, as indicated by the broken line.

The other structure is similar to that of the conventional example shown in FIG. 16, and its detailed description and illustration are omitted.

Next, how to use the magnified image pickup apparatus will be described. When the object surface F is in a mirror surface state, as shown in FIG.
The lighting head 2 of is screwed into the lens portion 104 to be fixed,
The object surface F is illuminated by the illumination light L close to the perfect incident light as shown in this figure, and the object surface F is displayed in the image. On the other hand, when it has a normal surface that can be observed by diffuse reflection, the illumination head 105 of FIG. 17 is attached to the lens unit 104 to observe the object surface F.

As described above, since the present illumination device uses the illumination light L from the optical fiber 106 of FIG. 1, a magnifying image pickup device dedicated to incident light is not required. Therefore, it is not necessary for the user to purchase the magnified image pickup device dedicated to the incident light.

In particular, since the present illumination device reflects the illumination light L from the optical fiber 106 inside the illumination head 2, that is, since it does not guide the light from the radial direction of the case 100, it is as shown in FIG. In addition, the magnifying imaging device becomes smaller.

Since the second reflecting surface 12 in FIG. 1 is not a half mirror but a normal reflecting surface that does not allow the reflected light L1 from the object surface F to pass through, the second reflecting surface 1
The structure of 2 becomes simple.

In the present invention, the second reflecting surface 12 may be a half mirror, and in this case, the second reflecting surface 12 may be arranged on the optical axis Lc. Also, the first light guide means 1
A light blocking unit that blocks the illumination light L that does not enter the second light guiding unit 1 from 06 may be provided.

In the present invention, the first reflecting surface 11
Need not reflect the illumination light L at a right angle to the optical axis Lc, but may reflect it in a direction having a component in the optical axis Lc direction as shown in FIG. In addition, the incident end face 1 of the second light guide means 1
0 may be remote from the optical fiber 106 or may be in contact with the optical fiber 106.

Further, the second light guide means 1 of FIGS. 3A and 3B does not need to be fan-shaped in plan view, that is, FIG.
The central angle φ of (a) is not limited, and may be semicircular or annular, and may be formed in a crank shape as shown in FIG. 3 (c). In the present invention,
It suffices to have at least two reflecting surfaces 11 and 12, and for example, as shown in FIG. 5, a first reflecting surface 11 is formed on the lighting head 2 and a conical member having the second reflecting surface 12 is provided. May be. Further, the present invention only needs to have the first and second reflecting surfaces 11 and 12, and even if one or more other reflecting surfaces are interposed between the first and second reflecting surfaces 11 and 12. Good.

In addition, as shown in FIG. 6, the second optical fiber 1A is used.
You may comprise a light guide means. In this figure, one or a plurality of optical fibers 1A are arranged inward from the radial outer peripheral portion of the illumination head 2 to the vicinity of the optical axis Lc, and receive the illumination light L from the optical fiber 106. In the vicinity of the optical axis Lc, the illumination light L is moved to the optical axis Lc as in the first embodiment.
The light is emitted substantially parallel to. The tip 1 of the optical fiber 1A
At least a part of a is arranged in the conical space S of FIG.

Although the second light guide means 1 is attached to the illumination head 2 in each of the above-mentioned embodiments, the second light guide means 1 may be fixed to the lens portion 104 in the present invention. Alternatively, the second light guide means 1 may be provided in the lens portion 104 in which the illumination head 2 is integrally formed. Furthermore, the first
The light guide means 106 does not have to be an optical fiber, and may be any one that emits an arcuate or annular light flux from the outer peripheral portion of the case 100 along the optical axis Lc.

Next, an embodiment according to the second invention of the present application will be described. 9 to 12 show a fifth embodiment. The lens unit 104 and the illumination head 2 shown in FIG.
6 is different from the lens unit 104 and the illumination head 105, and is used by being attached to the same image pickup unit 102 according to the application. As shown in the enlarged cross-sectional view of FIG. 10, the lighting head 2 has an observation window 20 at the center of the lower end (one end) in the radial direction, and a female screw part (mounting part) provided on the upper end (other end). ) 21 is attached to the lens unit 104.

An optical fiber (first light guiding means) 106 is arranged on the circumference (see FIG. 2) along the outer periphery of the lens portion 104. A part of the illumination light L from the optical fiber 106 is emitted from the observation window 20 of the illumination head 2 toward the object surface F through the second light guide means 3.

The second light guide means 3 comprises a light guide member 30 and a half mirror 31. The light guide member 30 is shown in FIG.
A transparent member (for example, acrylic) shown in 2 is vapor-deposited with a metal film. The metal film is for reflecting the illumination light L, and is shown by hatching in the drawing.
It is formed on the surface except 3. The light guide member 30 is
As described above, since the metal film is deposited on the transparent member, the reflecting surface 34 and the first and second light guiding portions 35 and 36 are integrally formed, and the tip surface of the optical fiber 106 in FIG. A part of the illumination light L emitted from is guided to the radial center of the illumination head 2.

FIG. 11 is an exploded perspective view of the lighting head.
As shown in this figure, a first light blocking member 41 is combined with the light guide member 30 in a dish shape. The first light blocking member 41 is
Since the surface has a matt black color so as to absorb the illumination light and the upper end surface 41a faces the exit end surface of the optical fiber 106 of FIG. The illumination light L of is blocked and absorbed. At the center of the light guide member 30 and the first light shielding member 41 combined in the dish shape of FIG.
7 are formed. The half mirror 31 is mounted in the mounting hole 37.

The half mirror 31 is provided on the optical axis Lc of the lens unit 103 of FIG. 10, reflects a part of the illumination light L from the light guide member 30, and reflects the reflected illumination light L on the optical axis Lc. The light is directed toward the object surface F along with a part of the reflected light L1 from the object surface F passing therethrough.

A second light shielding member 42 is arranged above the half mirror 31. The second light blocking member 42 is
As shown in FIG. 11, it is disk-shaped with a through hole 42a for the reflected light L1 in the center and has a matt black surface, and a minute gap S between the half mirror 31 and the light guide member 30 in FIG. By covering the above from above, the illumination light L is prevented from entering the lens unit 103 as described later.

The light guide member 30, the first light blocking member 41, the half mirror 31, and the second light blocking member 42 shown in FIG.
Are fixed to the lighting head 2 by adhesion.

In FIG. 10, a part of the illumination light L emitted from the optical fiber 106 is blocked by the first light blocking member 41 and absorbed. On the other hand, the other part of the illumination light L is
The light enters the second light guide portion 35 from the incident end surface 32 of the light guide member 30 and is reflected by the reflection surface 34 toward the radial center of the illumination head 2. The illumination light L from the reflecting surface 34 is
The light guide portion 36 guides the light to the half mirror 31, and a part of the light is reflected by the half mirror 31 in parallel with the optical axis Lc, and becomes incident light to illuminate the object surface F. A part of the reflected light L1 reflected by the object surface F passes through the half mirror 31, passes through the lens unit 103, and travels toward the CCD (imaging element) 101. Therefore, the object surface F can be observed even if the object surface F is a mirror surface.

When the illumination light L enters the CCD 101, the image becomes whitish and the image quality deteriorates. In order to prevent such deterioration, the first and second light shielding members 41 and 42 are provided in this embodiment. That is, the first light blocking member 41 blocks and absorbs the illumination light L from the optical fiber 106 that does not enter the incident end surface 32 of the light guide member 30, and prevents the illumination light L from entering the CCD 101. . In addition, between the light guide member 30 and the half mirror 31 having a cubic shape, part of the illumination light L traveling from the light guide member 30 toward the half mirror 31 is repeatedly reflected and tries to travel toward the lens unit 103. However, the second light blocking member 42 blocks and absorbs the illumination light L.

In the present invention, the light guide member 30 shown in FIG. 12 is not limited to the central angle φ, and may have a rod shape as shown in FIG. Also, as shown in FIG.
The light guide member 30 may be formed only by the reflection surface 34 that reflects the illumination light L from the optical fiber 106, and the reflection surface 34 may be configured by finishing the inner surface of the illumination head 2 into a mirror surface.
Further, as shown in FIG. 15, the light guide member 30 may be formed of another optical fiber connected to the optical fiber 106 which is the first light guide means. In addition, as shown in FIGS. 14 and 15, the first
The light shielding member 41 may have a disc shape having passage holes 41a and 41b that allow a part of the illumination light L and the reflected light L1 to pass therethrough.

[0047]

As described above, according to the first invention of the present application, the light from the first light guide means disposed along the outer peripheral portion of the cylindrical case is guided by the second light guide means. First and second
Since the reflective surface reflects light in the vicinity of the optical axis in a direction substantially parallel to the optical axis for projection, it is possible to observe a mirror-finished object surface by illumination similar to coaxial incident light, and an optical device dedicated to incident light. Need not be used. Especially,
Unlike the prior art, since the illumination light is not guided from the radial direction of the case, the optical device becomes compact. Further, according to the invention of claim 2, since the second light guide means is integrally formed, the mounting structure of the second light guide means is simplified. Further, according to the invention of claim 5, since the half mirror is not used, the structure of the second light guide means is simplified.

According to the second aspect of the invention, since the illumination light is projected onto the object surface along the optical axis by the half mirror provided on the optical axis of the lens unit, the object surface is observed by the coaxial incident light. can do. In particular, since a part of the illumination light from the first light guide means arranged on the circumference along the outer circumference of the cylindrical case is projected onto the object, it is necessary to use an optical device dedicated to the incident light. Absent. Furthermore, unlike the conventional case, it does not guide the illumination light from the outside of the case,
The optical device becomes smaller. Further, if a light blocking member that blocks the illumination light that does not enter the second light guide means is provided, excess light does not enter the image pickup element from the lens unit, so it is possible to prevent deterioration of the image. If a half mirror is provided in the lighting head, the expensive lens part can be used not only for incident light but also for both incident light and side incident light by replacing the illumination head, and observation by side incident light is also possible. Sometimes the half mirror is removed, so the image becomes clear.

[Brief description of drawings]

FIG. 1 is a schematic enlarged cross-sectional view of a distal end portion of an enlarged image pickup apparatus showing a first embodiment of the first invention.

FIG. 2 is an enlarged plan view showing an arrangement state of optical fibers.

FIG. 3A is an enlarged plan view showing a first light guide means,
(B) is an enlarged perspective view of the same, (c) is an enlarged perspective view showing a modification of the first light guide means.

FIG. 4 is an enlarged cross-sectional view of a main part showing a second embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part showing a third embodiment.

FIG. 6 is an enlarged cross-sectional view of a main part showing a fourth embodiment.

FIG. 7 is a schematic diagram showing the principle of the present invention.

FIG. 8 is a schematic diagram showing a state of regular reflection.

FIG. 9 is a schematic side view of an enlarged image pickup apparatus showing a fifth embodiment according to the second invention.

FIG. 10 is an enlarged cross-sectional view showing the main part.

FIG. 11 is an enlarged exploded perspective view of the illumination head.

FIG. 12 is an enlarged perspective view of a light guide member.

FIG. 13 is an enlarged perspective view showing a modified example of the second light guide means.

FIG. 14 is an enlarged cross-sectional view of a main part showing a sixth embodiment.

FIG. 15 is an enlarged cross-sectional view of the main parts showing the seventh embodiment.

FIG. 16 is a side view showing an example of an enlarged image pickup apparatus to which the present invention can be applied.

FIG. 17 is a cross-sectional view showing the tip portion.

FIG. 18 is a side view showing a conventional magnified image pickup device dedicated to incident light.

[Explanation of symbols]

 1: 2nd light guide means 11: 1st reflective surface 12: 2nd reflective surface 13: 1st light guide part 14: 2nd light guide part 15: 3rd light guide part 2: illumination head 20: observation window 21: Mounting part 3: Second light guide means 30: Light guide member 31: Half mirror 41: Light shielding member 100: Case 101: Image sensor 103: Lens unit 106: First light guide means L: Illumination light (optical axis) L1: Reflected light La: Axis line Lc: Optical axis

Claims (11)

[Claims] 1. A lens unit for image formation and a first for illumination.
The tip portion of the light guide means and the second light guide means are provided in a cylindrical case, and the tip portion of the first light guide means is circumferentially arranged along the outer peripheral portion of the case. In an optical device that emits at least a part of illumination light from a first light guide unit toward an object via the second light guide unit, the second light guide unit has a tip portion of the first light guide unit. Is disposed in the vicinity of the optical axis of the lens unit and reflects the illumination light emitted from the first reflection surface. The first reflection surface reflects the illumination light emitted from the inside in the radial direction of the case. The illumination light so that the optical axis of the reflected illumination light is substantially parallel to the optical axis of the lens unit, or is substantially parallel and intersects the optical axis of the lens unit. And a second reflecting surface that emits toward the optical device. 2. The first light guide unit according to claim 1, wherein the second light guide unit guides illumination light from the first light guide unit in an optical axis direction of the illumination light, and the first light guide unit. The first reflection surface that reflects the illumination light from the portion toward the inside in the radial direction of the case, the second light guide portion that guides the illumination light from the first reflection surface to the second reflection surface, and A third light guide portion that guides the illumination light from the second reflection surface substantially parallel to the optical axis of the lens unit, and by providing the two reflection surfaces, each of the second light guide means is provided. An optical device in which a light guide section and each reflection surface are integrally formed. 3. The reflected light that is specularly reflected at a point on the optical axis of the lens unit on the surface of the object through at least a part of the second reflecting surface via the lens unit according to claim 1 or 2. And is arranged in a range of incidence on the image pickup device mounted on the optical axis of the lens unit, and the second reflecting surface is arranged radially outward of the optical axis of the lens unit. Optical device. 4. An illumination head having an observation window provided at the center in the radial direction at one end and a mounting portion at the other end, and at least one on the circumference along the outer periphery of the illumination head. A first portion arranged to receive the illumination light from the axial direction of the illumination head and reflect the illumination light inward in the radial direction of the illumination head.
A reflecting surface and the illumination light from the first reflecting surface are reflected, and the optical axis of the reflected illumination light is substantially parallel to the axis line, or a direction that is substantially parallel and intersects the axis line. A second reflecting surface that emits the illumination light, and at least a part of the second reflecting surface is arranged in a cylindrical space having a radius of 1.0 mm and having the axis as the axis. 5. The optical device or the illumination head according to claim 1, 2, 3, or 4, wherein the second reflecting surface is a reflecting surface that does not allow reflected light from an object to pass therethrough. 6. A lens unit for imaging and a first for illumination.
The tip portion of the light guide means and the second light guide means are provided in a cylindrical case, and the tip portion of the first light guide means is circumferentially arranged along the outer peripheral portion of the case. In the optical device which emits at least a part of the illumination light from the first light guide unit toward the object through the second light guide unit, the second light guide unit is inward from the outer peripheral portion in the radial direction. It is composed of an optical fiber disposed near the optical axis of the lens unit, the illumination light from the first light guide means is incident, and the optical axis of the illumination light is approximately the optical axis of the lens unit. To guide the illumination light so as to be parallel or in a substantially parallel direction and intersect the optical axis of the lens unit, and emits the illumination light toward the object, and at least the tip of the optical fiber. The bottom part is the effective part of the objective lens of the lens unit. And, an optical apparatus characterized by being arranged in the cylindrical space the axis of the optical axis of the lens unit. 7. A lens unit for imaging and a first for illumination.
The tip portion of the light guide means and the second light guide means are provided in a cylindrical case, and the tip portion of the first light guide means is circumferentially arranged along the outer peripheral portion of the case. In an optical device that emits at least a part of illumination light from a first light guide unit toward an object via the second light guide unit, the second light guide unit has a tip portion of the first light guide unit. A part of the illuminating light emitted from the light guide member that guides a part of the illuminating light to the radial center of the case, and a part of the illuminating light from the light guiding member that is provided on the optical axis of the lens unit is reflected and reflected. An optical device, comprising: a half mirror that directs illumination light toward an object along the optical axis and allows a part of reflected light from the object to pass through. 8. The optical device according to claim 7, further comprising a light blocking member that blocks a part of the illumination light from the first light guide means. 9. The optical device according to claim 7, wherein the half mirror is provided in an illumination head attached to a lens unit to which the lens unit is attached. 10. An illumination head having an observation window provided at the center in the radial direction at one end and a mounting portion at the other end, wherein illumination light from the mounting portion side is directed inward in the radial direction. A light guide member that guides toward the light guide member is provided on an axis line that passes through the radial center of the lighting head, reflects a part of the illumination light from the light guide member, and reflects the reflected illumination light along the axis line. An illumination head including: a half mirror that allows a part of light reflected from the object to pass therethrough while being directed toward the object. 11. The illumination head according to claim 10, further comprising a light blocking member that blocks a part of the illumination light from the mounting portion side.