KR20210026975A - Prism - Google Patents

Abstract

The present invention relates to a prism, and more specifically, to a prism characterized in that by using a prism coated to differ a transmittance of a laser beam transmitted through a light exit surface, the laser beam can be output in the same direction as well as in the same magnitude. The prism according to the present invention comprises: an incident surface on which a laser beam is incident; an light exit surface which partially reflects the laser beam incident to the incident surface and allows the remaining laser beam to be transmitted; and a reflective surface which reflects the laser beam reflected from the light exit surface, such that the laser beam is reflected to the light exit surface at the same angle as the angle at which the laser beam is incident to the light exit surface from the incident surface. The light exit surface is coated with a different thickness of the reflective coating such that the transmittance of the transmitted laser beam becomes different. According to the present invention, the laser beam transmitted from the light exit surface is repetitively reflected and transmitted from the reflective surface several times along a longitudinal direction. At this time, it is possible to make the magnitude of the laser beam transmitted through the light exit surface equal by varying the thickness of the reflective coating to vary the transmittance along the longitudinal direction on the light exit surface. Moreover, according to the resent invention, the light exit surface and the reflective surface are formed in parallel to each other to face each other at both sides of the incident surface, such that the reflective surface reflects the laser beam reflected from the light exit surface at the same angle as the angle at which the laser beam is incident from the incident surface to the light exit surface. Therefore, the laser beam can be output in the same direction without having an additional mirror or lens.

Description

Prism {Prism}

The present invention relates to a prism, and more particularly, a prism capable of outputting the laser beam in the same direction as well as the same size by using a prism coated so that the transmittance of the laser beam transmitted to the exit surface is different. will be.

In general, the beam splitter used to split a laser beam includes a general type, a cube type, and a pellicle type. The light split through the beam splitter is fixed in the vertical direction as shown in FIG. 2. So, an additional mirror is needed to propagate the divided light in the same direction. In this case, problems such as an array error of the added mirror and a reduction in output occurred. Also, since it is designed to be split into two laser beams of a specific ratio, in order to split the laser beam into two or more, the split light must be split again. However, when dividing into three or more lights, there is a problem that the alignment of the optical system becomes complicated.

Registered Patent Publication No. 10-0862481 (Registration date 2008.10.01) Publication Patent Publication No. 10-2005-0116617 (published on December 13, 2005)

The present invention is to solve the above problems. An object of the present invention is to provide a prism capable of not only outputting a laser beam in the same direction but also outputting the same size by using a prism coated so that the transmittance of the laser beam transmitted to the exit surface is changed.

The prism according to the present invention includes an incident surface on which a laser beam is incident, an emission surface that partially reflects and transmits the laser beam incident on the incident surface, and the laser beam reflected from the emission surface is applied to the incident surface. A reflective surface is provided to reflect to the emission surface at the same angle as the angle incident on the emission surface, and the emission surface is coated with a different thickness of the reflective coating so that the transmittance of the transmitted laser beam is changed.

In addition, in the prism, it is preferable that the emission surface is coated with the reflective coating so that the size of the laser beam transmitted through the emission surface is output at the same size.

In addition, in the prism, the reflective surface and the exit surface are preferably formed in parallel to face each other on both sides of the incident surface, and the exit surface is coated thinner as the reflective coating is further away from the incident surface. It is desirable to be.

According to the present invention, the laser beam transmitted from the exit surface is repeatedly reflected and transmitted from the reflective surface several times along the longitudinal direction. At this time, the size of the laser beam transmitted to the exit surface may be the same by varying the thickness of the reflective coating so that the transmittance varies along the length direction on the exit surface.

In addition, according to the present invention, since the emission surface and the reflection surface are formed in parallel so as to face each other on both sides of the incident surface, the reflection surface is at the same angle as the angle at which the laser beam reflected from the exit surface is incident from the incident surface to the emission surface. Reflect it to the exit surface. Therefore, it is possible to output the laser beam in the same direction without having an additional mirror or lens.

1 is a conceptual diagram of an embodiment of a prism according to the present invention,
2 is a conceptual diagram of a conventional beam splitter.

An embodiment of a prism according to the present invention will be described with reference to FIG. 1.

The prism according to the present invention includes an incidence surface 10, an exit surface 20, and a reflective surface 30.

The laser beam B is incident on the incident surface 10. Here, it is preferable that an anti-reflection coating is formed so that all of the laser beams B incident on the incident surface 10 are incident.

The emission surface 20 is located on one side of the incident surface 10 to reflect a part of the laser beam B incident from the incident surface 10 and transmit the other. To this end, a reflective coating 40 is formed on the exit surface 20. At this time, the reflective coating 40 is coated with a different thickness so that the transmittance of the laser beam B is different. In more detail, the reflective coating 40 of the exit surface 20 is formed thinner as the distance from the incident surface 10 increases. This is to adjust the size of the laser beam B transmitted through the exit surface 20 and outputted.

The reflective surface 30 is positioned on the other side of the incidence surface 10 and is formed parallel to the exit surface 20 so as to face each other. Therefore, the reflective surface 30 is the emission surface 20 at the same angle (θ) as the angle (θ) of the laser beam (B) reflected from the exit surface (20) from the incident surface (10) to the exit surface (20). ) To reflect. At this time, it is preferable that the reflective coating 50 is coated with a predetermined thickness or more so that the reflective surface 30 can reflect all of the laser beams B reflected from the emission surface 20.

In the present embodiment, when the laser beam B is incident on the incidence surface 10, a part of the laser beam B is reflected by the reflective coating 40 of the emission surface 20, and the rest that is not reflected is transmitted through and output. At this time, since the emission surface 20 is coated with a different thickness of the reflective coating 40 depending on the position, the transmittance of the laser beam B transmitted through the emission surface 20 is changed.

As shown in FIG. 1, when the laser beam B is incident on the incidence surface 10, a part of the laser beam B is reflected by the first reflective coating 40a of the emission surface 20, and the rest is transmitted and output. Here, the first reflective coating 40a is formed so that the amount of the reflected laser beam B is greater than that of the transmitted laser beam B. The laser beam B reflected by the first reflection coating 40a of the emission surface 20 is reflected to the emission surface 20 by the reflection coating 50 of the reflection surface 30. Then, a part is reflected by the second reflective coating 40b of the emission surface 20, and the rest is transmitted and output. At this time, the second reflective coating 40b is formed to increase the transmittance of the laser beam B than the first reflective coating 40a. Therefore, when the transmittance is adjusted, the amount of the laser beam B incident on the second reflective coating 40b is smaller than that of the laser beam B incident on the first reflective coating 40a, but the transmitted amount may be the same. Therefore, when the laser beam B output to the exit surface 20 is divided along the longitudinal direction, the reflective coating 40 is further away from the incident surface 10 so that the laser beam ( It is preferable that the transmittance of B) is increased and the reflectance is decreased. That is, the laser beam (B) is repeatedly reflected several times from the reflective surface 30 along the longitudinal direction to the third reflective coating 40c, the fourth reflective coating 40d, and the end 21 of the emission surface 20. It can be divided into equal size while being transmitted.

)과 출사면(20)에서 반사면(30)으로 입사되어 출사면(20)으로 재반사되는 레이저 빔(B)의 반사각(

)이 동일하게 레이저 빔(B)을 반사시킨다. 그래서 추가적인 거울 또는 렌즈를 구비하지 않고도 레이저 빔(B)을 동일한 방향으로 출력할 수 있다. On the other hand, since the emission surface 20 and the reflection surface 30 are formed in parallel to face each other on both sides of the incident surface 10, the reflection surface 30 is a laser incident from the incident surface 10 to the emission surface 20. The angle of incidence of the beam (B) (

) And the reflection angle of the laser beam (B) incident on the reflection surface 30 from the emission surface 20 and re-reflected to the emission surface 20 (

) Equally reflects the laser beam (B). Therefore, it is possible to output the laser beam B in the same direction without having an additional mirror or lens.

10: entrance surface 20: exit surface
21: end 30: reflective surface
40(40a,40b,40c,40d),50: Reflective coating

Claims (3)

The incident surface on which the laser beam is incident, and
An emission surface that reflects part of the laser beam incident on the incidence surface and transmits the rest,
And a reflective surface for reflecting the laser beam reflected from the emission surface to the emission surface at an angle equal to an angle incident from the incident surface to the emission surface,
Prism, characterized in that the emission surface is coated with a different thickness of the reflective coating so that the transmittance of the transmitted laser beam is changed. The method of claim 1,
The emission surface is a prism, characterized in that the reflective coating is coated so that the size of the laser beam transmitted through the emission surface is output in the same size. The method of claim 2,
The reflective surface and the exit surface are formed in parallel to face each other on both sides of the incident surface,
The emission surface is a prism, characterized in that thinner as the reflection coating is further away from the incidence surface.

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