CN215642214U

CN215642214U - Compact light-homogenizing illuminator for projector

Info

Publication number: CN215642214U
Application number: CN202121603609.XU
Authority: CN
Inventors: 李晓阳; 李谦; 李秋实; 任耕北
Original assignee: Shanghai Lianggu Intelligent Technology Co ltd
Current assignee: Shanghai Lianggu Intelligent Technology Co ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2022-01-25
Anticipated expiration: 2031-07-14

Abstract

The utility model discloses a compact light-homogenizing illuminator for a projector, which is characterized in that a first lens, a second lens, a first fly eye lens, a second fly eye lens, a PBS device and a third lens are sequentially arranged from front to back, a reflector is obliquely arranged on the right side of the third lens, the third lens and the reflector are arranged in an included angle mode, a fourth lens is arranged at the included angle, and a polaroid is arranged on the front side of the fourth lens. By adopting the design of the aspheric lens, the optical path of direct light between the aspheric lens and the fly eye lens can be reduced, so that the size of the illuminator can be reduced, and the illuminator is more convenient to carry; through the design of the polarizing plate, the light can keep collimation during the transmission process, so that the light can be better refracted on the fly-eye lens.

Description

Compact light-homogenizing illuminator for projector

Technical Field

The utility model relates to the technical field of illuminators, in particular to an illuminator for a projector, which is compact and uniform in light.

Background

The illuminator is an optical collimator for projection television, generally divided into two major categories of coupled laser, and even if the illumination is performed by a light emitting diode, the illumination is performed by using a solid semiconductor as a light emitting material, so that energy generated in a process of emission through recombination of carriers is used for light emission.

The existing light source template generally adopts a plane arrangement mode, on one hand, the power of the light emitting diodes is very large, the heat is also very large, and the heat is dense, so that a space is required between the light emitting diodes and the first optical surface, and the space cannot be too small, on the other hand, the light emitting diodes have a certain volume and have a diameter, so that the space of the light emitting diode array cannot be smaller than the diameter. In general, the volume of a single module of the realization mode is very large, when the realization mode is applied to a plurality of groups of modules, a plane parallel combination mode is used, the structure is complex, the number of the modules is more, the volume is larger, the post-stage collimation and light homogenizing system is also very large, if higher laser output cannot be provided in one volume, the realization mode is very unfavorable for the miniaturization of a light source and the miniaturization of a laser projection whole machine product, and the efficiency is very high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a compact and uniform illuminator for a projector, which solves the problem of complicated arrangement of light source boards in the prior illuminator in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a light is spared to compactness is used for illuminator of projecting apparatus, including first lens, the second lens, first fly eye lens, the second fly eye lens, the PBS device, the third lens, the speculum, fourth lens and polaroid, first lens, the second lens, first fly eye lens, the second fly eye lens, the PBS device, the third lens sets gradually from the past to the back, the right side slope of third lens is provided with the speculum, third lens and speculum are the contained angle setting, contained angle department is provided with the fourth lens, the front side of fourth lens is provided with the polaroid.

Preferably, a light source is arranged at the front end of the first lens.

Preferably, the convex sides of the first lens and the second lens face the same direction.

Preferably, the convex sides of the first lens, the second lens and the third lens face in opposite directions.

Preferably, the focal length and size of the first fly-eye lens and the second fly-eye lens are matched with the parameters of the first lens and the second lens.

Preferably, the width of the first fly-eye lens and the second fly-eye lens is twice the thickness of the PBS device, and the material of the first fly-eye lens and the second fly-eye lens is PMMA, so as to facilitate processing.

Preferably, the light source is an LED lamp, and the size of the LED lamp is 3 x 4 mm.

Compared with the prior art, the utility model has the beneficial effects that: the compact light-homogenizing illuminator can reduce the optical path of straight light, so that the output efficiency and the output intensity of the light of the illuminator are enhanced, the illuminator can be suitable for small machines, and the carrying of the illuminator is more convenient:

1. by adopting the design of the aspheric lens, the optical path of direct light between the aspheric lens and the fly eye lens can be reduced, so that the size of the illuminator can be reduced, and the illuminator is more convenient to carry;

2. through the design of the polarizing plate, the light can keep collimation during the transmission process, so that the light can be better refracted on the fly-eye lens.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic view of a light refraction structure according to the present invention;

FIG. 3 is a schematic view of an optically integrated lens system (without a turning mirror) according to the present invention;

FIG. 4 is a schematic view of an optically integrated lens assembly (with a turning mirror) according to the present invention.

FIG. 5 is a diagram of image plane illuminance distribution in the present invention.

In the figure: the device comprises a first lens 1, a second lens 2, a first fly-eye lens 3, a second fly-eye lens 4, a PBS device 5, a third lens 6, a reflecting mirror 7, a fourth lens 8 and a polarizer 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a light is spared to compactness is used for illuminator of projecting apparatus, including first lens 1, second lens 2, first fly eye lens 3, second fly eye lens 4, PBS device 5, third lens 6, speculum 7, fourth lens 8 and polaroid 9, first lens 1, second lens 2, first fly eye lens 3, second fly eye lens 4, PBS device 5, third lens 6 sets gradually from the past to the back, the right side slope of third lens 6 is provided with speculum 7, third lens 6 and speculum 7 are the contained angle setting, the contained angle department is provided with fourth lens 8, the front side of fourth lens 8 is provided with polaroid 9.

Preferably, a light source a is disposed at the front end of the first lens 1.

Preferably, the convex sides of the first lens 1 and the second lens 2 face the same direction.

Preferably, the convex sides of the first lens 1, the second lens 2 and the third lens 6 are opposite in orientation.

Preferably, the focal length and size of the first fly-eye lens 3 and the second fly-eye lens 4 are matched with the parameters of the collimating lens group.

Preferably, the width of the first fly-eye lens 3 and the second fly-eye lens 4 is twice the thickness of the PBS device 5, and the material of the first fly-eye lens 3 and the second fly-eye lens 4 is PMMA, so as to facilitate processing.

Preferably, the light source a is an LED lamp, the size of the LED lamp is 3 × 4mm, the tangents of the ray divergence angles in the x and y directions through a collimating lens with a focal length of 20mm are 3/20 and 4/20, respectively, and assuming that the focal length of the first fly-eye lens 3 and the second fly-eye lens 4 is f, and the width and height of a single small lens in the first fly-eye lens 3 and the second fly-eye lens 4 are w and h, respectively, they should satisfy the following relations:

3/20≤w/f

4/20≤h/f

w/h＝16:9

substituting w-5.6 and h-3.2 into the above equation, f-16 can be obtained.

Since the maximum aperture of the collimating lens group is not more than 40 × 40mm, the apertures of the first fly-eye lens 3 and the second fly-eye lens 4 can also be controlled to be about 40mm, so that the array number of the first fly-eye lens 3 and the second fly-eye lens 4 can be set to be 7(x direction) × 12(y direction), and the corresponding total size is 39.2 × 38.4 mm.

And the parameters of the first fly-eye lens 3 and the second fly-eye lens 4 are as described in table 1:

table 1: fly-eye lens system parameters

The thickness of the PBS 5 is 2.8mm, the dimensions are 48 × 40mm, the material is K9 optical glass, nd is 1.5168, Vd is 64.2, and the distance between the PBS 5 and the third lens 6 is 1.2 mm.

An image display (HTPS) is arranged between the PBS device 5 and the third lens 6, with a device size of 16.32 x 9.18mm, which should satisfy the following relationship, assuming a focal length f of the optically integrated transmission lens group:

9.18/f＝4/30

from this it can be calculated that f is 45.9mm, and in practice f should be slightly larger so that the spot on the HTPS is slightly larger than the size of the device to ensure a certain margin, so f is designed to be 48 mm. In addition, the far infrared ray path of the object space should be designed to ensure that the light rays are incident on the HTPS surface normally as much as possible. Since the polarizing plate 9 is indispensable in the optical path, the polarizing plate 9 is also designed as a part of the lens group. The design results are shown in Table 2:

table 2: optical integrated lens set parameters

The optical path detailed parameters obtained by combining the several parts are shown in table 3.

Table 3: optical path detailed parameter table

The uniformity of light incident on the HTPS face was calculated to be 95.3% (nine-point method), the uniformity in the middle portion was better and the effect in the edge portion was slightly worse. If the F number of the rear projection lens is 1.4, the total luminous flux incident into the lens is 2750 lumens, if the F number is 1.5, the total luminous flux incident into the lens is 2549 lumens, if the F number is 1.6, the total luminous flux is 2325 lumens, and if the F number is 1.8, the total luminous flux is 2001 lumens; if the F-number is 2.0, the total luminous flux is 1669 lumens. It follows that this solution places high demands on the relative aperture of the projection lens, preferably up to around 1.4, which would otherwise result in a large reduction in the total luminous flux.

In the case where the F-number of the projection lens is 1.4, we estimate the luminous flux projected onto the screen. Assuming that the transmittance of the PBS device is 0.75, the aperture ratio of the HTPS device is 0.57, the transmittance of the projection lens and the X-prism is 0.8, the transmittance of the illumination optical path is 0.8, and the transmittance of the polarizer sheet is 0.8 (note that there are two sheets), the total luminous flux is:

w2750 0.75 0.57 0.8 482 lumens

The size of the entire light path (from LED to HTPS) is about 132 x 44 x 43 (length x width x height).

If a turning mirror is added to the light path, the size of the light path is about 106 x 68 x 43 mm.

It will be understood by those skilled in the art that the optical components of the first lens 1, the second lens 2, the first fly-eye lens 3, the second fly-eye lens 4, the PBS device 5, the third lens 6, the reflecting mirror 7, the fourth lens 8, the polarizer 9, and the like according to the present embodiment are correspondingly arranged in the required projection apparatus in the positional relationship shown in fig. 1 and 2, so as to achieve the optical effects according to the present embodiment. As for the supporting structure of the projection apparatus for supporting the optical components, it is not within the scope of the present embodiment, and therefore, the corresponding drawings and text descriptions related to the supporting structure are omitted.

It is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and are not to be considered limiting of the scope of the present invention.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A compact light homogenizing illuminator for a projector, characterized by: including first lens, second lens, first fly-eye lens, second fly-eye lens, PBS device, third lens, speculum, fourth lens and polaroid, first lens, second lens, first fly-eye lens, second fly-eye lens, PBS device, third lens set gradually after to in the past, the right side slope of third lens is provided with the speculum, third lens and speculum are the contained angle setting, contained angle department is provided with fourth lens, the front side of fourth lens is provided with the polaroid.

2. A compact dodging illuminator for projectors according to claim 1, wherein: the front end of the first lens is provided with a light source.

3. A compact dodging illuminator for projectors according to claim 1, wherein: the convex side of the first lens and the convex side of the second lens face the same direction.

4. A compact dodging illuminator for projectors according to claim 1, wherein: the first lens and the second lens are opposite to the convex side of the third lens in direction.

5. A compact dodging illuminator for projectors according to claim 1, wherein: the focal length and the size of the first fly-eye lens and the second fly-eye lens are matched with the parameters of the first lens and the second lens.

6. A compact dodging illuminator for projectors according to claim 1, wherein: the width of the first fly-eye lens and the width of the second fly-eye lens are two times of the thickness of the PBS device, and the first fly-eye lens and the second fly-eye lens are made of PMMA.

7. A compact dodging illuminator for projectors according to claim 2, wherein: the light source is an LED lamp, and the size of the LED lamp is 3 multiplied by 4 mm.