JPS60188901A - Manufacture of combined prism - Google Patents

Abstract

PURPOSE:To execute completely an adhesion, and to realize a high performance of a polarizing element used for an optical switch, etc. by providing a bankshaped projection on the first constituting parts, making the second constituting parts adhere by making to contact by pressing, and thereafter, removing the projection. CONSTITUTION:As for a polarizing element used for an optical switch, etc., plural prisms are made to adhere with an optical adhesive agent. In that case, on a glass plate 51 being the first constituting parts, a bank-shaped projection 8 is formed by using a resist agent used for, for instance, the photolithography. Subsequently, a prism 53 being the second constituting parts is made to adhere by using an adhesive agent 62 by making it contact by pressing to said projection, and thereafter, the projection 8 is removed. According to such a method, an airgap caused by shortage of the adhesive agent, and deterioration of a characteristic caused by cut-off of an optical path, etc. due to an excessive adhesive agent do not occur, and a high performance of the polarizing element used for the opti cal switch, etc. can be realized.

Description

Detailed Description of the Invention [8] Technical Field of the Invention The present invention relates to a combination prism, in particular, to a combination prism from the middle of the plane of a first component made of an optical material to a second component made of an optical material. Relating to a method for bonding planes.

Background of the Technology A combination prism formed by bonding at least two component parts, such as a polarizing prism used in an optical switch, is constructed by bonding a plurality of prisms.

FIG. 1 is a diagram for explaining the outline of the optical switch using a polarizing prism (polarizing element).

In Figure 1, 1 and 2 are polarizing elements J, and 3 is a Faraday element.
It is a rotating element, and the light incident on the polarizing element l from the x1 direction is divided into horizontally polarized waves and vertically polarized waves by the polarization separation film 11. That is, normally, horizontally polarized waves contained in incident light are transmitted through the polarization separation film, whereas vertically polarized waves are reflected by the polarization separation film.

The horizontally polarized waves are transmitted through the polarization separation film 11 and are reflected by the reflective surface 12 of the polarizing element 1 before entering the Faraday rotator 3, while the vertically polarized waves are transmitted through the polarization separation film 11.
The beam is reflected by the beam and enters the Faraday rotation element.

When the plane of polarization of the light having the angle 11 is not rotated by the Faraday rotation element 3, it passes through the Faraday rotation element 3 as it is and enters the polarization element 2. In this case, the horizontally polarized wave that has been applied to the polarization separation film 21 of the polarizing element 2 is transmitted and emitted in the direction of Yl, and the vertically polarized wave is reflected by the reflective surface 22 of the polarizing element 2 and is transmitted to the polarized bone. ^
The light is incident on the mirror 21, but it is reflected again by the dust and exits in the I direction of yt.

Further, when the polarization plane of the light separated by the polarizing element 1 is rotated by 90 degrees by the Faraday rotator 3, the horizontally polarized wave incident on the Faraday rotator 3 becomes vertically polarized wave, and this is the polarized wave of the polarizer 2. The vertically polarized wave reflected by the polarization separation film 21 and emitted in the direction of Y2 and similarly incident on the Faraday rotation element 3 becomes horizontally polarized wave, which is reflected by the reflective surface 22 of the polarizing element 2. Bone 1! ill
The light passes through the film 21 and is emitted in the Y2 direction.

In this way, the polarizing element 1 divides the incident light into 1 parts, and the Faraday rotation element 3 rotates and controls the polarization plane of these separated lights, thereby making it possible to switch the direction of light output from the polarizing element 2. .

At the same time, the same thing can be done for the light that enters the polarizing element 1 from the x2 direction, and thereby it is also possible to selectively extract two lights that have different incident directions.

tc+ Prior Art and Problems An example of such a polarizing element will be shown in Part 2. Here, the prisms constituting the polarizing element are bonded with an optical adhesive such as Halsam. However, as shown in FIG. 2, the polarizing element 5 is composed of a parallel glass plate 51, a prism 52 bonded to one surface of the glass plate 1i51, and a prism 53 bonded to the other surface of the glass plate 51, When the prism 53 is bonded to one surface from the center of the other surface using the conventional method, the bonding boundary becomes a void if the adhesive 6 is insufficient, as shown in enlarged view in FIGS. 3(A) and 3(B). If the amount of leaky adhesive 61 is increased slightly to the glass plate so as to prevent the formation of voids 7 and
This has the disadvantage that it spreads and adheres to the surface of the element 5, partially blocking the optical path of the transmitted light and deteriorating the characteristics of the element 5.

fdl OBJECT OF THE INVENTION The object of the present invention is to eliminate the above problems and provide a combination prism,
In particular, the goal is to improve the performance of polarizing elements used in optical switches and the like.

(el) Structure of the Invention The above object is to provide a combination prism in which a plane of a second component made of an optical material is adhered to one side from the middle of a plane of a first component made of an optical material. A bank-like protrusion is formed in the middle part of the plane of the first component to which the adhesive edge of the plane of the second component is abutted, and then the second component has the adhesive edge abutted to the protrusion. This is achieved by a combined prism manufacturing method characterized in that the plane of the first component is adhered to one side from the middle of the plane of the first component, and then the protrusion is removed.

([1 Examples of the invention The present invention will be described in detail below using the accompanying drawings.

FIG. 4 is a diagram for explaining an embodiment in which the method of the present invention is applied to the production of the polarizing element 5 described above, according to the order of its main steps.

In Fig. 4, in which the same reference numerals are used for the same parts as in the previous drawing, (A) there is a bank-like shape in the center of the adhesive surface (plane of the first component) of the glass plate 51 (first component). (B) is a side view showing a state in which the prism 53 (second component) is adhered to the adhesive surface; (C) is a side view showing a state in which the projection 8 is removed. It is a diagram.

FIG. 4 (In this case, a protrusion 8 that is stable to the adhesive 6 and can be removed without damaging the adhesive 6, for example, a resist agent used in photolithography is used to bond the protrusion 8. The adhesive is formed to be thicker than the adhesive thickness of the agent 6 by an appropriate amount on the adhesive surface of the glass plate 51.

In FIG. 4 (b), using adhesive 6, glass+S,
Prism 53 is glued to 51. At that time, prism 53
Glue so that the adhesive edge almost touches the protrusion 8,
And if you do not run out of adhesive, the excess adhesive 6
2 is pushed out along the end face of the prism 53.

Next, when the protrusion 8 is removed, the excess adhesive 62 remaining on the end face of the prism 53 is removed, as shown in FIG.
Since it spreads to the end face due to leakage to the glass plate 51 and the prism 53, its length L is smaller than its width W, and it does not significantly impede transmitted light.

In the above embodiment, the protrusion 8 uses a resist agent that can be removed with an organic solvent, but it can be removed by using a material that is easier to remove, especially an adhesive or paint that is water-soluble after solidification. It's extremely easy.

As explained in "2. Effects of the Invention", according to the present invention, the conventional characteristic deterioration caused by excess adhesive blocking the optical path is significantly reduced, and the present invention is utilized in a polarizing element to achieve high performance optical switches. The resulting effect is remarkable.

[Brief explanation of the drawing]

Figure 1 is a diagram to explain the outline of an optical switch using a polarizing prism (polarizing element), Figure 2 is a side view showing an example of the configuration of a polarizing element, and Figure 3 is a polarizing prism shown in Figure 2. FIG. 4 is a diagram for explaining the drawbacks when assembled by adhesion, and FIG. This is a diagram for In the figure, 1.2.5 is a polarizing element (combined prism), 6 is an adhesive, 51 is a glass plate (first component),
8 is a bank-like projection, 53 is a prism (second component), 61
and 62 are extra adhesives. Grass l factor χl 2nd factor 3rd figure leather 4th figure (1') (V)

Claims (1)

[Scope of Claims] ill In a combination prism formed by bonding a plane of a second component made of an optical material to one side from the middle of a plane of a first component made of an optical material, the first A bank-like protrusion is formed in the intermediate part of the plane of the component to which the adhesive edge of the plane of the second component is abutted, and then the adhesive edge of the second component is abutted to the protrusion. A method for manufacturing a combination prism, comprising: adhering a flat surface to one side of the first component from an intermediate portion of the flat surface, and then removing the protrusion. (2) A method for producing a patented rhythm, characterized in that the bank-like protrusions are water-soluble. (3) The method for manufacturing a combined prism according to claim 11, wherein the combined prism is a polarizing element such as an optical switch or an optical circulator.