JP2595360Y2 - Beam splitter device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to optical equipment such as a microscope and a measuring instrument, and relates to a beam splitter for splitting a light beam in two directions.

[0002]

2. Description of the Related Art Among beam splitters applied to optical instruments such as microscopes and measuring instruments, there are beam splitters arranged in a parallel light beam region in the optical instrument. Fig. 7 shows, for example,
No. 3,284,799, filed by the present applicant.
FIG. 2 is a configuration diagram of a beam splitter. In this beam splitter, the bottom surfaces of the prisms 1 and 2 having an isosceles triangular cross section are formed by surface contact with each other, and the surface contact portion is a light beam splitting surface 3. Therefore, light incident on the beam splitter along the incident optical axis 4 is partially light beam component
Here to exit optical axis reflected by Toki surface 3 is branched into other incoming optical axis 4 light is transmitted through the light beam splitting surface 3 direction coaxial with the branches along the reflection optical axis 5.

In such a beam splitter, it is necessary to accurately position and fix the reflected optical axis 5 so as to be perpendicular to the incident optical axis 4, and this includes a light beam incident surface 6 of the beam splitter. The angle β between the normal to the incident optical axis 4 is fixed with high precision.

Specifically, it is necessary to process each base angle α of an isosceles triangle in each of the prisms 1 and 2 with high accuracy.
At the same time, as shown in FIG. 8, since each beam splitter is fixed to the prism fixing base 7, the inclination angle β ′ of the mounting surface 8 of the prism fixing base 7 that comes into contact with the light beam incident surface 6.
Processing with high accuracy.

[0005]

In order to accurately position and fix the reflected optical axis 5 of the beam splitter in the direction perpendicular to the incident optical axis 4 as described above, the prisms 1, 2
And the inclination angle β 'of the mounting surface 8 of the prism fixing base 7 must be machined with high accuracy, which increases the manufacturing cost. Therefore, an object of the present invention is to provide a beam splitter device that can accurately position and fix a beam splitter without requiring high processing accuracy.

[0006]

According to the present invention, two prisms each having a cross section of an isosceles triangle are arranged at the base of the isosceles triangle.
The predetermined surfaces to be contacted are brought into surface contact with each other to form a light beam splitting surface,
A beam splitter in which at least a part of a predetermined surface of one of the prisms is exposed without contacting a predetermined surface of the other prism; and a beam splitter that abuts on a predetermined surface of the one exposed prism .
A prism fixing base having an attachment portion that, the prism fixing
The beam splitter is fixed to the table from the side.
Comprising a constant section, the prism fixing base beam splitter
Optical axis and output of beam splitter when fixing to
Beam splitting about an axis orthogonal to both optical axes
The orientation of the prism should be the same
And a beam splitter device determined only by contact with the beam splitter. For such a beam splitter device
The isosceles triangle prism has an obtuse obtuse angle.
And the incident light strikes the beam entrance surface of the beam splitter.
Incident at a non-perpendicular angle. Also such a beam
In the splitter device, an isosceles triangular prism
The specified surface of the prism on the side other than the incident light side
Exposed to the rhythm.

[0007]

[Function] By providing such means, it is exposed.
A prism having an attachment portion abutting on a predetermined surface of one prism
The cross section is an isosceles triangle with respect to the mounting
Beam splitter composed of two prisms
Attach this beam splitter to the prism holder.
And fix it from the side. In this way, the beam split
Beam splitter when fixing the beam to the prism holder
About the axis perpendicular to both the input and output optical axes of the
The direction of the beam splitter
It is determined only by the contact between the predetermined surface of the system and the mounting portion .
Thus, the beam splitter is positioned such that the light beam reflecting surface is perpendicular to the incident optical axis with respect to the reflected optical axis.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external structural view of a beam splitter device. The beam splitter 10 includes a first prism 11 having an isosceles triangle as shown in a cross-sectional shape in the direction of the arrow (a) in FIG. 2 and a second prism 12 having an isosceles triangular cross-section similar to the first prism 11. , And each bottom surface is in surface contact.

The first prism 11 is formed to have a width L1 as shown in an external view seen from the direction of arrow (b) in FIG. 3, and the other second prism 12 is formed to have a width L1 of the first prism 11.
The width L2 is smaller than the width L1 by a predetermined width.

The light beam splitting surface 13 is formed by bringing the prisms 11 and 12 into surface contact with each other. In FIG. 1, the light beam splitting surface 13 is indicated by oblique lines. In this case, since the widths L1 and L2 of the prisms 11 and 12 are different as described above, the light beam splitting surface 1 on the bottom surface of the first prism 11
Both sides of 3 are exposed, and respective contact surfaces 14 and 15 are formed in portions outside the effective light beam area. In FIG. 1, the contact surfaces 14, 15 are indicated by oblique lines.

On the other hand, a U-shaped or U-shaped prism fixing base 20 is provided, on which the beam splitter 10 is positioned and fixed. This prism fixing base 20 is
Each mounting surface 23, 24 is formed on each side surface 21, 22. These mounting surfaces 23 and 24 are formed at an inclination angle θ1 for positioning the incident optical axis at right angles to the reflected optical axis of the beam splitter 10.

A screw hole 25 and holes 26 and 27 for injecting an adhesive are formed on one side surface 22, and a fixing screw 28 is screwed into the screw hole 25. Has become.

The beam splitter 10 is fixed to the prism fixing base 20, and the abutting surfaces 14, 15 of the beam splitter 10 are respectively fixed to the respective mounting surfaces 2.
3 and 24 are contacted and fixed.

More specifically, first, when the beam splitter 10 is mounted on the prism fixing base 20, the contact surfaces 14 and 15 of the first prism 11 are brought into contact with the mounting surfaces 23 and 24 of the prism fixing base 20. Provided.

Next, the side surface 11 a of the first prerhythm 11 is pressed against the side surface 21 of the prism fixing base 20 by screwing the fixing screw 28 into the screw hole 25, that is, by screwing. The dimensions of the second prism 12 are determined so as not to contact the side surface 29 of the prism fixing base 20 in response to the pressing of the first prism 11. Next, each hole 26,
An adhesive is poured in from 27, and the prisms 11 and 12 are bonded and fixed to the prism fixing base 20.

With such a configuration, the prism fixing base 20
The two prisms 11, with respect to the mounting surfaces 23, 24 of
Attach beam splitter 10 composed of 12
The beam splitter 10 is attached to the prism fixing base 20.
To the beam from the side.
It is orthogonal to both the input optical axis and the output optical axis of the splitter 20.
Direction of the beam splitter 20 around the axis
Attach to the mounting surfaces 14 and 15 of one of the prisms 11
Since it is determined only by contact with the mounting surfaces 23 and 24, the accuracy of arranging the incident optical axis perpendicular to the reflected optical axis of the beam splitter 10 is determined by the inclination angle θ
1 only depends on the processing accuracy.
It no longer depends on the machining accuracy of the 12 base angles. Therefore, the manufacturing cost can be reduced because it does not directly depend on the processing accuracy of the base angles of these prisms 11 and 12. Each prism 1
Since the vicinity of the center of each of the prisms 1 and 12 is fixed by an adhesive, the occurrence of cracks in each of the prisms 11 and 12 can be reduced by this adhesive force.

Further, for positioning and fixing the beam splitter 10, the prisms 11 and 12 are attached to the respective mounting surfaces 23 and 24.
Therefore, the incident optical axis with respect to the reflected optical axis of the beam splitter 10 can be accurately positioned by a simple operation with high accuracy. Next, a second embodiment of the present invention will be described.

FIG. 4 is an external configuration diagram of the prism fixing base 30 of the beam splitter device, and FIGS. 5 and 6 are configuration diagrams of the beam splitter 40 mounted and fixed to the prism fixing base 30.

As shown in FIG. 5, the beam splitter 40 includes a first prism 41 having an isosceles triangular cross section, and a second prism 42 having an isosceles triangular cross section similar to the first prism 41. , And each bottom surface is in surface contact.

The first prism 41 has a width L3 as shown in FIG. 6, and the second prism 42 has a width L4 which is smaller than the width L3 of the first prism 41 by a predetermined width.

The light beam splitting surface 43 is formed by bringing the prisms 41 and 42 into surface contact with each other. In this case, as shown in FIG. 6, each of the prisms 41 and 42 is arranged so that one side surface of each is aligned with the same plane. Further, since the widths of the prisms 41 and 42 are different as described above, one side of the light beam splitting surface 43 on the bottom surface of the first prism 41 is exposed, and the contact surface 4
4 are formed.

A beam splitter 40 is positioned and fixed to the prism fixing base 30. The prism fixing base 30 has one mounting surface 32 formed on one side surface 31. The mounting surface 32 is provided on the beam splitter 4.
It is formed at an inclination angle θ2 that positions the incident optical axis at right angles to the 0 reflected optical axis. A screw hole 34 is formed in the other side surface 33, and a fixing screw 35 is screwed into the screw hole 34.

A beam splitter 40 is fixed to the prism fixing base 30, and the contact surface 44 of the beam splitter 40 comes into contact with the mounting surface 32 and is fixed. Specifically, first, the first prism 41 forming the beam splitter 40
Of the mounting surface 32 of the prism fixing base 30
Provided in contact with. Next, the side surface 41 a of the first prerhythm 41 is pressed against the side surface 31 of the prism fixing base 30 by screwing the fixing screw 35 into the screw hole 34.

With such a configuration, the beam splitter 4
The accuracy of arranging the incident optical axis perpendicular to the 0 reflected optical axis depends on the processing accuracy of the inclination angle θ2 of the mounting surface 32,
Since it does not directly depend on the processing accuracy of the base angles of the prisms 41 and 42, the manufacturing cost can be reduced.

Further, since the positioning and fixing of the beam splitter 10 can be performed by simply attaching each prism 41 to the mounting surface 32, the incident optical axis with respect to the reflected optical axis of the beam splitter 30 can be formed at a high accuracy by a simple operation. Can be positioned. The present invention is not limited to the above embodiments, but may be modified without changing the gist of the invention.

[0027]

As described above in detail, according to the present invention, it is possible to provide a beam splitter device capable of easily positioning and fixing the beam splitter with high accuracy without requiring high processing accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a beam splitter device according to the present invention.

FIG. 2 is a configuration diagram of a beam splitter in the same device as viewed from a lateral direction.

FIG. 3 is a configuration diagram showing each prism width in a beam splitter of the apparatus.

FIG. 4 is a configuration diagram showing a second embodiment of the beam splitter device according to the present invention.

FIG. 5 is a configuration diagram of a beam splitter in the same device as viewed from a lateral direction.

FIG. 6 is a configuration diagram showing each prism width in a beam splitter of the apparatus.

FIG. 7 is a configuration diagram of a beam splitter .

FIG. 8 is a view for explaining optical axis positioning of the beam splitter.

[Explanation of symbols]

10,40 ... beam splitter, 11, 41 ... first prism, 12, 42 ... second prism, 13, 43 ... light beam component
Toki surface, 14,15,44 ... abutment surface, 20, 30 ... prisms fixed base, 21 ... side, 23,24,32 ... mounting surface, 25 and 34 ... screw hole, 26 ... hole, 28 ,
35 ... fixed screw.

Claims (3)

(57) [Scope of request for utility model registration] 1. A light beam splitting surface is formed by bringing predetermined surfaces corresponding to the bases of said two isosceles triangles of two prisms each having a cross section of an isosceles triangle into surface contact with each other. A beam splitter whose portion is exposed without contacting a predetermined surface of the other prism; and a beam splitter that abuts the predetermined surface of the one exposed prism
That a prism fixing base having an attachment portion, with respect to the prism fixing base, the beam splitter their
Fixing means for fixing the beam splitter to the prism fixing base.
At the time of the input optical axis and the output optical axis of the beam splitter.
Said beam splitter about an axis orthogonal to both
The orientation of the one of the exposed one of the prisms
A beam splitter device characterized in that it is determined only by contact between a surface and the mounting portion . 2. An isosceles triangular prism having a vertex
The angle is obtuse, and the incident light is reflected by the beam splitter.
It is noted that the light is incident at an angle that is not
The beam splitter device according to claim 1, wherein: 3. An incident light of said isosceles triangular prism.
The predetermined surface of the prism on the non-light side is the prism on the incident light side.
2. The device according to claim 1, wherein the device is exposed to
Beam splitter device.