JPH0750210B2 - Observation optical device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an observation optical apparatus for simultaneously observing an object to be inspected from two directions perpendicular to each other using a common objective lens.

(Background of the Invention) Conventionally, in this type of observation optical device, for example, prior to the work of connecting the cores of two optical fibers, the cores of the two optical fibers are perpendicular to each other for axial alignment of the cores. It is used for simultaneously observing from two directions using a common objective lens, and such a conventional observation optical system is, for example, one as shown in FIG.

That is, the observation optical device shown in FIG. 4 is provided with the reflecting member 2 tilted by 45 ° with respect to the optical axis of the common objective lens 1, and as an object to be inspected between the objective lens 1 and the reflecting member 2. Two optical fiber cores 3 and 4 to be connected (in the drawing, a cross section of a connecting portion of both cores 3 and 4 is shown) are arranged, and illumination is performed by illumination light from a light source (not shown). An image A is directly formed by the first light flux 5 that is directly incident on the objective lens 1 from the cores 3 and 4, and the second light beam is incident on the objective lens 1 after the cores 3 and 4 are reflected by the reflecting member 2. The reflected image B is formed by the light beam 6.

However, in such a conventional observation optical device, two object points having different object distances (cores 3 and 4 and reflected images of the cores 3 and 4 by the reflecting member 2) are simultaneously observed with the common objective lens 1. Therefore, in principle, a difference in magnification occurs, and this difference in magnification causes a difference in brightness between the direct image A and the reflected image B, and also the size thereof is different. further,
The direct image A is focused by moving the objective lens 1, and the reflected image B is focused by moving the reflecting member 2 to the objective lens 1.
The objective lens 1 is a magnifying optical system of about 10 times, and it is difficult to finely adjust the direct image A and the reflected image B. Therefore, for these reasons, it is difficult to directly observe the image A and the reflected image B, it takes time to align the cores 3 and 4, and there is a problem that workability is poor.

(Object of the Invention) The present invention has been made in view of such conventional problems, and is for forming a first light flux for forming a direct image of an object to be inspected and an indirect image thereof. By eliminating the difference in magnification between the second light flux and the second light flux, the brightness and size of both images are equal, and delicate focus adjustment of both images is easy, and therefore the direct image A and the reflected image B are easily adjusted. It is an object of the present invention to provide an observation optical device that makes it easy to observe.

(Summary of the Invention) The gist of the present invention for achieving such an object is to provide an observation optical device for simultaneously observing an object to be inspected from two directions perpendicular to each other, using an optical axis of the objective lens. With a reflecting member tilted with respect to the object to be inspected between the reflecting member and the objective lens,
An optical path of a first light flux for directly entering the objective lens from the object to be inspected to form a direct image of the object to be inspected and incident on the objective lens after being reflected from the object to be inspected by the reflecting member. Then, an optical path separating member for separating the optical path of the second light flux for forming a reflected image of the object to be inspected is provided, and the optical path of the first light flux and the second light flux of the second light flux separated by the optical path separating member are provided. A magnification correction lens is provided in at least one of the optical paths so as to be movable in the optical axis direction, and a direct image by the optical path of the first light flux and a reflected image by the optical path of the second light flux are combined into one visual field. An observing optical device is characterized in that it is provided with an image synthesizing member.

In the observation optical device, the magnification correction lens provided in at least one of the optical paths of the first light flux and the optical path of the second light flux causes a gap between the object images formed by the light fluxes of the both light paths. Is corrected so that the brightness and size of the direct image and the indirect image of the object to be inspected are equalized, and the direct image A and the direct image are moved by moving the magnification correction lens in the optical axis direction. Subtle focus adjustment of at least one of the reflected images B can be easily performed.

(Embodiment) Each embodiment of the present invention will be described below with reference to the drawings. In each embodiment, the same parts are designated by the same reference numerals, and the duplicated description will be omitted.

1 and 2 show a first embodiment of the present invention, and FIG. 1 is a sectional view showing a schematic arrangement of an optical system of an observation optical apparatus.

The observation optical device shown in FIG. 1 is provided with a reflecting member 2 tilted by 45 ° with respect to the optical axis 1a of the common objective lens 1,
Two optical fiber cores 3 to be connected as an object to be inspected between the objective lens 1 and the reflecting member 2,
4 (in the drawing, the cross section of the connecting portion between the cores 3 and 4 is shown) is arranged perpendicular to the optical axis 1a of the objective lens.

The objective lens 1 is well corrected for aberrations with respect to two object points (cores 3 and 4 and reflection images of the cores 3 and 4 by the reflecting member 2) having different object distances, and its magnification is 10 × to 20 ×.
It is about X.

A light source 7 illuminates the cores 3 and 4.

Behind the objective lens 1, the optical paths of the first light flux 5 for directly entering the objective lens 1 from the cores 3 and 4 to form the direct image A of the cores 3 and 4, and the cores 3 and 4. Is reflected by the reflecting member 2 and then enters the objective lens 1,
The junction prism 8 is provided as an optical path separating member that separates the optical path of the second light beam 6 for forming the reflected image B of No. 4 from the optical path separating member.

The cemented prism 8 is composed of a right-angled prism 8a having an isosceles right triangle cross section and a rhomboid prism 8b having a parallelogram cross section, and this cemented surface is a semi-transmissive surface 80.

A right-angle prism 9, a convex lens 10 as a magnification correction lens, and a right-angle prism 11 are provided in the optical path of the first light flux 5 emitted from the junction prism 8, and the second prism 8 emitted from the junction prism 8 is provided. A right-angle prism 12 is provided in the optical path of the luminous flux 6. The convex lens 10 is provided to correct the difference in magnification so that the direct image A and the reflected image B have the same size because the direct image A has a larger magnification than the reflected image B due to the difference in the object distance. This is a reduction optical system, which is movable along the optical axis 1b.

At the intermediate position between the right-angle prism 11 and the right-angle prism 12, a direct image of the first light beam 5 emitted from the right-angle prism 11 and the second light beam 6 emitted from the right-angle prism 12 are formed.
A right-angle prism 13 is arranged as an image synthesizing member for matching the reflected image from the optical path of 1 with one visual field 14. Then, the composite image of the visual field 14 is observed through a photographing means (not shown).

In the observation optical device having the above-described configuration, the optical path of the first light flux 5 that enters the objective lens 1 by illuminating the cores 3 and 4 with the illumination light from the light source 7 reflected by the reflecting member 2 and the light from the light source 7 The junction prism 8 separates the optical path of the second light flux 6 which is incident on the objective lens 1 after being reflected by the reflecting member 2 from the cores 3 and 4 by the illumination light. That is, the first light beam 5 emitted from the objective lens 1 passes through the semi-transmissive surface 80, travels along the optical path of the first light beam 5, is reflected by the reflecting surface of the rectangular prism 8a, and then is reflected by the rectangular prism 8a. The second light beam 6 emitted from the objective lens 1 is reflected by the semi-transmissive surface 80 and the second light beam 6 is emitted.
Traveling along the optical path of, and after being reflected by the reflecting surface of the rhombus prism 8b, it is emitted from the rhombus prism 8b toward the right-angle prism 12.

The first light beam 5 emitted from the right-angle prism 8a is reflected by the right-angle prism 9 and enters the convex lens 10, and the convex lens 10
After being subjected to the converging action of 10, it is reflected by the right-angle prism 11 toward the reflecting surface 13a of the right-angle prism 13.

The second light beam 6 emitted from the rhombus prism 8b is reflected by the right-angle prism 12 toward the reflecting surface 13b of the right-angle prism 13.

The right-angle prism 13 combines the first light beam 5 from the right-angle prism 11 and the second light beam 6 from the right-angle prism 12 so that they are adjacent to each other with the ridge of the right-angle prism 13 as a boundary, and a direct image A of each light beam is formed. And a reflected image B in FIG. 2 (a),
As shown in (b), they are combined in one visual field 14. For this reason, the two optical axes 1b and 1c are aligned on a straight line between the right-angle prisms 11 and 12, and the ridges of the right-angle prism 13 as a visual field synthesizing member are arranged so as to intersect at right angles to the optical axis. Has been done.

In FIGS. 2A and 2B, a direct image A is formed on the left half of the visual field 14 and a reflected image B is formed on the right half of the visual field 14. The convex lens 10 is connected to the first of the first light flux 5.
Since the direct image A is provided in the optical path, the direct image A is contracted as compared with the case where the objective lens 1 is formed alone, so that the direct image A and the reflected image B have the same magnification. In the direct image A, A1 is a direct image of the core 3 and A2 is a direct image of the core 4. In the reflected image B, B1 is the reflected image of the core 3 and B2 is the reflected image of the core 4.

The direct image A and the reflected image B have substantially the same magnification because the convex lens 10 is provided in the optical path of the first light flux 5, and therefore the direct images A1 and A2 and the reflected images B1 and B2 are obtained.
Have the same size and brightness.

Regarding the focus adjustment of the direct images A1 and A2 and the reflected images B1 and B2, the direct observation of the direct images A1 and A2 is performed by moving the entire observation optical device except the light source 7 and the reflecting member 2 in the vertical direction of the figure. And the reflecting member 2 is attached to the objective lens 1
By moving in the direction perpendicular to the optical axis 1a of
The focus can be adjusted independently.

Further, by moving the convex lens 10 in the optical axis direction, the delicate focus adjustment of the images A1 and A2 can be performed independently.

By observing the direct images A1 and A2 and the reflected images B1 and B2 thus focused in one visual field 14, the two cores 3 and 4 connected to each other can be simultaneously viewed from two directions perpendicular to each other. Can be observed.

When the direct images A1 and A2 and the reflected images B1 and B2 are observed in the visual field 14, when the direct images A1 and A2 and the reflected images B1 and B2 are displaced from each other as shown in FIG. , The axes of the two cores 3 and 4 do not coincide, so that the direct image A1 coincides with the direct image A2 and the reflected image B1 coincides with the reflected image B2, respectively, as shown in FIG. 2 (b). It is sufficient to move the two cores 3 and 4 relatively while observing.

FIG. 3 shows a second embodiment of the present invention.
In the observation optical device according to the embodiment, a concave lens 30 is used as a magnification correction lens instead of the convex lens 10 in the optical path between the rhomboid prism 8b and the right-angle prism 12, and is arranged so as to be movable along the optical axis 1c. The other configurations are similar to those of the first embodiment.

Therefore, in the observation optical device shown in FIG.
Is a concave lens 30 so that the magnification of the direct image A is almost equal to
Has been expanded by.

As for the focus adjustment of the direct images A1 and A2 and the reflected images B1 and B2, as in the case of the first embodiment, by directly moving the entire observation optical device except the light source 7 and the reflecting member 2 in the vertical direction in the drawing, The images A1 and A2 can be adjusted in focus, and the reflection images B1 and B2 can be adjusted by moving the reflecting member 2 in a direction perpendicular to the optical axis 1a of the objective lens 1.

Further, according to the second embodiment, even with respect to the reflected images B1 and B2 which are difficult to focus, the concave lens 30 is moved in the optical axis direction to perform the delicate focus adjustment of the reflected images B1 and B2 independently. be able to.

In addition, the magnification correction lens is used for direct image A and reflected image B.
May be provided in both the optical path of the first light flux 5 and the optical path of the second light flux 6 so that the magnifications of A and B are equal. In such a case, the direct image A1 can be obtained by moving each magnification correction lens. , A2 can be finely adjusted independently, and also the reflected images B1, B2 can be finely adjusted independently. Further, such delicate focus adjustment is possible because a magnification correction lens is provided on the image side of the objective lens 1 forming an enlarged image. When focusing is performed by changing the object distance by moving the reflecting member 2 as in the conventional case, the image distance changes by the square of the magnification with respect to the change of the object distance.
It was difficult to make fine adjustments because the degree to which the movement of the subject changed its focus was too great.

Further, in the above-mentioned first and second embodiments, since the light beam is totally reflected by using the right-angle prism 9, the right-angle prism 11 and the right-angle prism 12, the right-angle prism 9, right-angle prism 11 and right-angle prism 12 are used instead. There is less loss of light compared to the case where a reflecting mirror is used.

Further, in each of the above embodiments, since there is almost no difference in magnification between the direct image A and the reflected image B, image processing becomes easier when the observation optical device is connected to the image processing system.

In each of the above embodiments, the angle at which the reflecting mirror 2 is tilted with respect to the optical axis 1a of the objective lens 1 is not limited to 45 °.

(Effect of the Invention) According to the observation optical device of the present invention, at least the optical path of the first light beam forming the direct image of the object to be inspected and the optical path of the second light beam forming the reflected image of the object to be inspected. A magnification correction lens provided on one side corrects a difference in magnification between the two light fluxes, whereby the brightness and size of the direct image and the indirect image become equal, and the magnification correction lens is moved in the optical axis direction. As a result, delicate focus adjustment of at least one of the direct image and the reflected image can be easily performed, so that the direct image and the reflected image can be easily observed and workability is improved.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a schematic sectional view of an optical system showing an observation optical device, and FIG. 2 (a) is an object to be inspected. FIG. 2B is a perspective view of the observation optical device showing a state where the axes of the two cores are not aligned with each other. FIG. 2B is a perspective view of the observation optical device showing a state where the axes of the two cores are aligned with each other. FIG. 4 is a schematic sectional view of an optical system showing an observation optical apparatus according to a second embodiment of the present invention, and FIG. 4 is a schematic sectional view of an optical system showing a conventional example. 1 ... Objective lens, 1a ... Optical axis of objective lens 2 ... Reflecting member, 3, 4 ... Core (object to be inspected) 5 ... First light flux, 6 ... Second light flux 8 ... Bonding Prism (beam separation member) 10 …… Convex lens (magnification correction lens) 13 …… Right-angle prism (image combining member) 30 …… Concave lens (magnification correction lens) A …… Direct image, B …… Reflected image

Claims (1)

[Claims] 1. An observation optical apparatus for simultaneously observing an object to be inspected from two directions perpendicular to each other by using a common objective lens, wherein a reflecting member is provided tilted with respect to the optical axis of the objective lens, and the reflecting member is provided. The object to be inspected between the objective lens and the objective lens, and the optical path of the first light beam for directly entering the objective lens from the object to form the direct image of the object and the object to be inspected. An optical path separating member is provided, which is reflected from the object to be inspected by the reflecting member and then enters the objective lens to be separated into an optical path of a second light flux for forming a reflected image of the object to be inspected. A magnification correction lens is movably provided in the optical axis direction in at least one of the optical path of the first light flux and the optical path of the second light flux separated by And the reflection image of the second light flux One observation optical device characterized by comprising providing an image synthesis member for combining the visual field.