CN201159798Y

CN201159798Y - Polarization conversion device

Info

Publication number: CN201159798Y
Application number: CNU2008200010272U
Authority: CN
Inventors: 李永宏; 高亚贵; 陶海玲
Original assignee: WUHAN ZHONGYUAN ELECTRONICS GROUP Ltd
Current assignee: WUHAN ZHONGYUAN ELECTRONICS GROUP Ltd
Priority date: 2008-01-14
Filing date: 2008-01-14
Publication date: 2008-12-03
Anticipated expiration: 2018-01-14

Abstract

Disclosed is an optical polarization conversion device which includes two rhombic prisms at the up and down position and a right-angle prism. Wherein, the section of the up and down rhombic prisms is parallelogram whose inner angles are two 45 degrees angle and two 135 degrees angle; the section of the right-angle prism is isosceles right triangle whose apex angle is 90 degrees and bottom angles are 45 degrees. The surface where the long side of the up and down rhombic prisms exists is glued with the surface where one of the waists of the right-angle prism exists; a polarization splitting film is plated between the two glued surfaces. The surface corresponding to the bottom side of the right-angle prism is glued with a half Lambda piece and is formed into a whole body. During the work, the non-polarized light is entered from the optical entrance end face; the P light is passed through on the glued interface and the S light is reflected. The P light is then converted to S light by the half-Lambda piece and is transmitted out from the output end face together with the reflected S light; thereby finishing the polarization conversion of non-polarized light input and S light output. The device has the advantages of increased optical energy utilization ratio, improved symmetry of the illumination light path, good effect and high performance price ratio.

Description

The light polarization conversion equipment

Technical field

The utility model relates to a kind of light polarization conversion equipment, and exactly, it is by two rhombic prisms and the light polarization conversion equipment that right-angle prism constitutes.

Background technology

In the illumination path of light engine, to carry out polarization conversion usually.The light polarization conversion equipment of widespread usage has two kinds now: a kind of direct employing polaroid, another kind are to adopt a rhombic prism and the light polarization converter that right-angle prism is formed.These two kinds of light polarization conversion equipments all can convert natural light to the required polarized light of system, but obviously existing the not enough and asymmetric shortcoming of system design of light-use aspect the efficiency of light energy utilization and the system design, thereby make the picture quality of ray machine relatively poor, systemic price ratio is low.

Summary of the invention

A kind of polarization converter that the purpose of this utility model designs and produces with regard to being to overcome the deficiency of prior art.

In order to achieve the above object, the technical solution adopted in the utility model is:

A kind of light polarization conversion equipment comprises: go up rhombic prism, following rhombic prism, right-angle prism and two polarization beam splitters and one 1/2 λ wave plate, it is characterized in that for one:

The described rhombic prism of going up is a parallelogram with its cross section of following rhombic prism, and four interior angles are respectively two 45 ° and two 135 °.And its cross section of described right-angle prism is an isosceles right triangle, be that drift angle is 90 °, two base angles are 45 °, the face at the face at the place, long limit of last rhombic prism and a waist place of right-angle prism glues together mutually, the face at the face at the place, long limit that following rhombic prism and last rhombic prism are symmetrical and another waist place of right-angle prism glues together mutually, and be coated with polarization beam splitter between two cemented surfaces, combining constitutes an integral body.

Principle of work of the present utility model is to be injected from the light inlet end face of this device by the nonpolarized light behind the collimation lens collimation that light source comes, and sees through the P polarized light on cemented surface, and reflection S polarized light.The P polarized light is then through becoming the light output end ejaculation of S polarized light from this device behind the 1/2 λ wave plate, the S polarized light of reflection is reflected in a side of rhombic prism, penetrate from the light output end of this device, the line focus lens are delivered to dividing-mixing optical system, thereby finished nonpolarized light incident, with the polarization conversion of S polarized light outgoing.

As from the foregoing, the utility model relatively and the conventional polarization conversion mode following advantage is arranged: the efficiency of light energy utilization that the first can bigger raising incident nonpolarized light; It two is effectively to improve the symmetry of illumination path, and has characteristics such as reasonable in design, reliable operation, easy to use, respond well, cost performance height.

Description of drawings

Fig. 1 is the utility model one-piece construction synoptic diagram.

Fig. 2 is the installation site synoptic diagram of the utility model in illumination path.

Symbol description among the figure:

The 1st, last rhombic prism

The 2nd, following rhombic prism

The 3rd, right-angle prism

The 4th, polarization beam splitter

5 is 1/2 λ wave plates

1-1 goes up place, the long limit of rhombic prism face

2-2 is place, the long limit of a following rhombic prism face

3-1 and 3-2 are right-angle prism two waist place faces.

Embodiment

See also shown in Figure 1, be the utility model specific embodiment, comprise: go up the following rhombic prism of

rhombic prism

1,2, a right-angle prism 3 for one, and two polarization beam splitters 4 and one 1/2 λ wave plate 5, wherein, the cross section of last rhombic prism 1 and following rhombic prism 2 is a parallelogram, and four interior angles are respectively two 45 ° and two 135 °; And the cross section of right-angle prism 3 is an isosceles right triangle, and promptly drift angle is 90 °, and the base angle is two 45 °; 1-1 place, the long limit face of last rhombic prism 1 glues together mutually with a waist 3-1 place face of right-angle prism; The face at the face at the 2-2 place, long limit that following rhombic prism 2 and last rhombic prism 1 are symmetrical and another waist 3-2 place of right-angle prism 3 glues together mutually, and is coated with polarization beam splitter 4 between two cemented surfaces; The face at place, right-angle prism 3 base posts 1/2 λ wave plate 5, combines to constitute an integral body.

And the physical dimension of last rhombic prism 1 and following rhombic prism 2 is identical with material.The waist length of right-angle prism 3 equates with the length of side on the long limit of upper and lower rhombic prism 1 and 2.The material of right-angle prism 3 is identical with the material of upper and lower

rhombic prism

1 and 2.

See also shown in Figure 2ly, when the utility model uses, it is installed in collimation lens in the light engine illumination path and the position between the condenser lens.

Above embodiment only is explanation technical characterictic of the present utility model and exploitativeness, and its purpose is to make the person skilled in art can understand content of the present utility model and is implemented.Thus, the conversion that the design of the present utility model of all foundations has been done includes in claim of the present utility model.

The utility model is a product that has practicality, reliability and progressive in the illumination path of light engine, meets the utility application important document fully, files an application according to Patent Law.

Claims

1. light polarization conversion equipment comprises: go up rhombic prism (1), a following rhombic prism (2), a right-angle prism (3) for one, and two polarization beam splitters (4) and one 1/2 λ wave plate (5), it is characterized in that:

Described cross section of going up rhombic prism (1) and following rhombic prism (2) is a parallelogram, and four interior angles are respectively two 45 ° and two 135 °;

The cross section of described right-angle prism (3) is an isosceles right triangle, and promptly drift angle is 90 °, and the base angle is two 45 °;

The described face of going up the place, long limit (1-1) of rhombic prism (1) glues together mutually with a waist (3-1) the place face of right-angle prism (3);

The face at the face at the described place, long limit (2-2) of rhombic prism (2) down and another waist (3-2) place of right-angle prism (3) glues together mutually; And be coated with polarization beam splitter (4) between two cemented surfaces; The pairing face in right-angle prism (3) base posts 1/2 λ wave plate (5), combines to constitute an integral body.

2. light polarization conversion equipment as claimed in claim 1 is characterized in that:

It is described that upward rhombic prism (1) is identical with material with the physical dimension of following rhombic prism (2).

3. light polarization conversion equipment as claimed in claim 1 is characterized in that:

The waist of right-angle prism (3) is long to be equated with the long edge lengths of upper and lower rhombic prism (1,2).

4. light polarization conversion equipment as claimed in claim 1 is characterized in that:

The material of described right-angle prism (3) is identical with the material of upper and lower rhombic prism (1,2).