CN111650722A

CN111650722A - L-shaped double-chip full-high-definition projection lens

Info

Publication number: CN111650722A
Application number: CN202010435222.1A
Authority: CN
Inventors: 周伟统
Original assignee: Hangzhou Youren Photoelectric Technology Co ltd
Current assignee: Hangzhou Youren Photoelectric Technology Co ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2020-09-11

Abstract

The invention discloses an L-shaped double-chip full-high-definition projection lens, which comprises a plurality of lens components arranged along an optical axis from a projection surface to a chip, wherein the lens components are a first negative meniscus lens, a second negative meniscus lens, a biconcave lens, a first positive lens, a second positive lens, a first triple cemented lens, a second triple cemented lens and a third positive lens in sequence arranged along the optical axis from the projection surface to the chip, the projection lens comprises a prism combination arranged between the chip and the third positive lens, and the prism combination comprises two light-in prisms respectively close to the chip and a light-combining prism close to the third positive lens. The optical axes of the biconcave lens and the first positive lens can be reflected and folded by a reflector, and the included angle between the front optical axis and the rear optical axis of the reflector is between 70 and 110 degrees. The method has the advantages of long back focus, strong resolving power, good uniformity and small distortion, and meets the requirement of full-high-definition projection.

Description

L-shaped double-chip full-high-definition projection lens

Technical Field

The invention belongs to the projection technology in the photoelectric display industry, and particularly relates to an L-shaped double-chip full high-definition projection lens for a full high-definition image projector.

Background

The double-chip projection technology perfectly fuses the images of the two chips through the light-combining prism, and the images are projected through the projection lens, so that the double-chip projection technology has higher brightness than a single chip, and more colored light sources are selected to achieve the purposes of high brightness and high color gamut. The optical path of the double-chip projection lens needs to pass through the color-combination prism and the light incidence prism at the same time, and a larger back focal length is needed. A larger back focal length and higher image quality tend to be difficult to fill at the same time.

The L-shaped lens can reduce the volume of the lens through folding and turning, and meets the arrangement requirement and practical application of a special projector. The lens has an L-shaped folding characteristic, a large back focal length and high image quality, and is often difficult to be filled at the same time.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides an L-shaped double-chip full-high-definition projection lens, which is designed by using a plastic aspheric lens to meet the requirements of higher definition and TV distortion of the aspheric surface. And a reasonable lens structure is used, so that a larger back focal length and higher definition are achieved. The light path of the lens can be reflected and refracted by the reflector, and the configuration requirements and the application of a special projector are met.

Incident light irradiates on a display chip through an incident light prism, imaging light of two chips respectively reaches a light-combining prism through the incident light prism, the two imaging light paths have different color spectrum sections, one imaging light path is reflected in the light-combining prism, the other imaging light path is transmitted, the two imaging light paths are combined into one imaging light path, the imaging light path enters a lens, and a picture is projected.

The structure adopted by the invention is as follows: the utility model provides a full hi-vision projection lens of two chips of L type, contains the projection lens body, the projection lens includes the lens subassembly that arranges along the optical axis from the plane of projection to a plurality of between the chip, the lens subassembly is first negative meniscus lens, the negative meniscus lens of second, biconcave lens, first positive lens, the positive lens of second, first three cemented lens, the three cemented lens of second, the positive lens of third from the plane of projection to a plurality of between the chip along the optical axis order of arranging, the projection lens is including setting up the prism combination between chip and the positive lens of third, and the prism combination includes that two are close to the income light prism of chip respectively and are close to the light prism that closes of the positive lens of third.

Preferably, the projection lens further includes a diaphragm surface disposed between the second positive lens and the first cemented third lens.

Further, the chip display surface is perpendicular to the optical axis, and the chip center can be placed away from the optical axis.

Further, the focal length of the second negative meniscus lens is between-80 mm and-60 mm; the focal length of the biconcave lens is between-70 mm and-40 mm; the focal length of the first positive lens is between 90mm and 130 mm; the focal length of the second positive lens is between 90mm and 130 mm; the focal length of the first third cemented lens is between-140 mm and-100 mm; the focal length of the first cemented third lens is between 60mm and 90 mm; the focal length of the third positive lens is between 70mm and 100 mm.

Further, the refractive index of the first negative meniscus lens is between 1.45 and 1.60; the refractive index of the second negative meniscus lens is between 1.50 and 1.65; the refractive index of the biconcave lens is between 1.45 and 1.60; the refractive index of the first positive lens is between 1.60 and 1.70; the refractive index of the second positive lens is between 1.70 and 1.80; in the first cemented third lens, the refractive index of the negative lens close to the diaphragm is between 1.80 and 1.95, the refractive index of the middle positive lens is between 1.45 and 1.60, and the refractive index of the negative lens close to the second cemented third lens is between 1.55 and 1.70; in the second third cemented lens, the refractive index of the positive lens close to the first cemented lens is between 1.45 and 1.55, the refractive index of the middle negative lens is between 1.70 and 1.80, and the refractive index of the positive lens close to the third positive lens is between 1.45 and 1.55; the refractive index of the third positive lens is between 1.45 and 1.60.

Furthermore, the left and right surfaces of the first negative meniscus lens are aspheric surfaces.

Furthermore, the projection lens comprises a reflector arranged between the optical axes of the biconcave lens and the first positive lens, the optical axes can be reflected and turned by the reflector, and an included angle between the front optical axis and the rear optical axis of the reflector is between 70 and 110 degrees.

The invention has the beneficial effects that: 1. the invention provides a projection lens with low F number of 2.0, a field angle of 85 degrees and a focal length of 9.7mm, which is an imaging objective lens with simple structure and cost control and optimization; 2. the invention uses the diaphragm as the boundary, the negative group lens is in front, the positive group is in back, the negative distance type objective lens, the lens with the similar structure is selected as the initial structure according to the structure, the size of the chip is changed, and finally the projection lens with excellent image quality is designed by changing the optimized design of increasing and decreasing the glass material, zooming the focal length and controlling the aberration. 3. The dual chip projection mode has the advantages of high brightness and high color gamut compared with single chip projection.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a graph of MTF for the present invention;

fig. 3 is a dot diagram of the present invention.

In the figure: 1. a first negative meniscus lens; 2. a second negative meniscus lens; 3. a biconcave lens; 4. a first positive lens; 5. a second positive lens; 6. a first third cemented lens; 7. a second third cemented lens; 8. a third positive lens; 9. a chip; 10. the light source comprises a light incidence prism 11, a light combination prism 12, a diaphragm surface 13 and a reflecting mirror.

Detailed Description

The embodiments of the present invention will be further explained with reference to the drawings.

The structure adopted by the invention in fig. 1 is: the utility model provides a full hi-vision projection lens of two chips of L type, contains the projection lens body, the projection lens includes the lens subassembly that arranges along the optical axis from the plane of projection to a plurality of between the chip, the lens subassembly is first negative meniscus lens 1, second negative meniscus lens 2, biconcave lens 3, first positive lens 4, second positive lens 5, first three cemented lens 6, three cemented lens 7 of second, third positive lens 8 along the optical axis arrangement order between the plane of projection to the chip, the projection lens is including setting up the prism combination between chip 9 and third positive lens 8, and the prism combination includes two and is close to the light-in prism 10 of chip 9 and is close to the light-combining prism 11 of third positive lens respectively.

The projection lens further comprises a diaphragm surface 12 disposed between the second positive lens 5 and the first cemented third lens 6.

The chip display surface is perpendicular to the optical axis, and the center of the chip can be placed away from the optical axis.

Wherein the focal length of the second negative meniscus lens is between-80 mm and-60 mm; the focal length of the biconcave lens is between-70 mm and-40 mm; the focal length of the first positive lens is between 90mm and 130 mm; the focal length of the second positive lens is between 90mm and 130 mm; the focal length of the first third cemented lens is between-140 mm and-100 mm; the focal length of the first cemented third lens is between 60mm and 90 mm; the focal length of the third positive lens is between 70mm and 100 mm.

And the refractive index of the first negative meniscus lens is between 1.45 and 1.60; the refractive index of the second negative meniscus lens is between 1.50 and 1.65; the refractive index of the biconcave lens is between 1.45 and 1.60; the refractive index of the first positive lens is between 1.60 and 1.70; the refractive index of the second positive lens is between 1.70 and 1.80; in the first cemented third lens, the refractive index of the negative lens close to the diaphragm is between 1.80 and 1.95, the refractive index of the middle positive lens is between 1.45 and 1.60, and the refractive index of the negative lens close to the second cemented third lens is between 1.55 and 1.70; in the second third cemented lens, the refractive index of the positive lens close to the first cemented lens is between 1.45 and 1.55, the refractive index of the middle negative lens is between 1.70 and 1.80, and the refractive index of the positive lens close to the third positive lens is between 1.45 and 1.55; the refractive index of the third positive lens is between 1.45 and 1.60.

The left and right surfaces of the first negative meniscus lens are aspheric surfaces.

The projection lens further comprises a reflector 13 arranged between the optical axes of the biconcave lens and the first positive lens, the optical axes can be reflected and turned by the reflector, and an included angle between the front optical axis and the rear optical axis of the reflector is between 70 degrees and 110 degrees.

The curvature radius, material and thickness of each lens and the distance between the lenses are modified to achieve the optimization of aberration.

The following is a DMD chip with a ratio of 16 to 9 of 0.47 inch and the center point of the long edge of the display area of the chip is coincident with the center of the lens, and the parameters of the optical system of the projection lens according to the embodiment of the present invention are given.

Aspherical surface coefficient:

Surface

x2

x4

x6

x8

x10

x12

1

0

1.50542E-05

-1.15056E-08

8.51122E-13

3.28643E-15

1.53263E-19

2

0

1.46777E-05

-1.51411E-09

-1.06605E-11

-5.14816E-14

1.24124E-16

x14	x16	x18	x20
				-4.17867E-22	-6.76857E-25	4.55843E-29	1.94578E-31
-6.75294E-20	-8.24216E-24	-1.23505E-26	2.04703E-29

finally, the optical projection lens with 85 degrees of visual fields, 9.7mm of focal length, 2.0F number, uniform image quality of each visual field and optimal image quality is obtained. When a 16 to 9 ratio 0.47 inch DMD chip and the center point of the long edge of the display area of the chip coincides with the center of the lens, the ANSI standard throw ratio can reach 0.85.

FIG. 2 is a MTF graph of the present invention, in which the MTF curves of the fields under 93lp/mm are compacted into a bundle of curves larger than 0.42, which shows that the image formed by the lens is clear and uniform. The pixel of a 1920 × 1080 0.47 chip is 5.4 μm, which corresponds to 93lp/mm for a quinies line pair, and the MTF value >0.42 for this line pair meets the resolution requirement of the chip.

Fig. 3 is a dot array diagram of the present invention, and it is known that the average diffuse spot radius of the dot array diagram under each field of view is less than 6.434 microns, and the image quality is good.

Claims

1. The utility model provides a full hi-vision projection lens of L type double-chip, contains the projection lens body, its characterized in that, the projection lens includes the lens subassembly that arranges along the optical axis from the plane of projection to a plurality of between the chip, the lens subassembly is first negative meniscus lens, second negative meniscus lens, biconcave lens, first positive lens, second positive lens, first three cemented lens, second three cemented lens, third positive lens from the plane of projection to a plurality of between the chip along the optical axis order of arranging, the projection lens is including setting up the prism combination between chip and third positive lens, and the prism combination includes two income light prism that are close to the chip respectively and the light-combining prism that is close to third positive lens.

2. The L-shaped dual-chip full-high-definition projection lens of claim 1, wherein: the projection lens further comprises a diaphragm surface arranged between the second positive lens and the first third cemented lens.

3. The L-shaped dual-chip full-high-definition projection lens of claim 1, wherein: the chip display surface is perpendicular to the optical axis, and the center of the chip can be placed away from the optical axis.

4. The L-shaped dual-chip full-high-definition projection lens of claim 1, wherein: the method is characterized in that:

the focal length of the second negative meniscus lens is between-80 mm and-60 mm;

the focal length of the biconcave lens is between-70 mm and-40 mm;

the focal length of the first positive lens is between 90mm and 130 mm;

the focal length of the second positive lens is between 90mm and 130 mm;

the focal length of the first third cemented lens is between-140 mm and-100 mm;

the focal length of the first cemented third lens is between 60mm and 90 mm;

the focal length of the third positive lens is between 70mm and 100 mm.

5. The L-shaped dual-chip full-high-definition projection lens of claim 1, wherein:

the refractive index of the first negative meniscus lens is between 1.45 and 1.60;

the refractive index of the second negative meniscus lens is between 1.50 and 1.65;

the refractive index of the biconcave lens is between 1.45 and 1.60;

the refractive index of the first positive lens is between 1.60 and 1.70;

the refractive index of the second positive lens is between 1.70 and 1.80;

in the first cemented third lens, the refractive index of the negative lens close to the diaphragm is between 1.80 and 1.95, the refractive index of the middle positive lens is between 1.45 and 1.60, and the refractive index of the negative lens close to the second cemented third lens is between 1.55 and 1.70; in the second third cemented lens, the refractive index of the positive lens close to the first cemented lens is between 1.45 and 1.55, the refractive index of the middle negative lens is between 1.70 and 1.80, and the refractive index of the positive lens close to the third positive lens is between 1.45 and 1.55;

the refractive index of the third positive lens is between 1.45 and 1.60.

6. The L-shaped dual-chip full-high-definition projection lens of claim 1, wherein: the left and right surfaces of the first negative meniscus lens are aspheric surfaces.

7. The L-shaped dual-chip full-high-definition projection lens of claim 1, wherein: the lens comprises a reflector arranged between optical axes of the biconcave lens and the first positive lens, the optical axes can be reflected and turned by the reflector, and an included angle between the front optical axis and the rear optical axis of the reflector is between 70 degrees and 110 degrees.