CN202196192U

CN202196192U - Optical lens device, projection system and imaging device

Info

Publication number: CN202196192U
Application number: CN 201120341582
Authority: CN
Inventors: 汤伟平
Original assignee: Hong Kong Applied Science and Technology Research Institute ASTRI
Current assignee: Hong Kong Applied Science and Technology Research Institute ASTRI
Priority date: 2011-09-13
Filing date: 2011-09-13
Publication date: 2012-04-18
Anticipated expiration: 2021-09-13
Also published as: WO2013037143A1

Abstract

The utility model discloses an optical lens device, comprising a central area and a peripheral area for allowing light to pass through, a lens array is formed in the central area, and the peripheral area has a smooth surface. With the optical lens device of the utility model, a higher light efficiency can be achieved through a projection lens with a smaller aperture, and the manufacturing is easy and the cost is low.

Description

Optical lens device, optical projection system and imaging device

Technical field

The utility model relates to optical imaging apparatus, particularly relates to a kind of optical lens device, optical projection system and imaging device.

Background technology

Projector is also claimed projector, be through optical module with accurate enlargement ratio with the image enlarging projection on projection screen for the equipment of observing.In optical projection system, often as being used to the light integrator of beam shape homogenising or shaping is used lens arra.The etendue E of lens characterizes the area and the angle of the light of broadcasting, and simple defining is the function of refractive index n, solid angle Ω and area A, dE=n ²D Ω ²DA.In optical projection system, light source means that more greatly usually etendue E is big more, and this needs wide-aperture more projection lens.Fig. 1 has showed the light communication effect of traditional optical projection system at the projecting lens that uses different apertures with Fig. 2; Like Fig. 1, shown in 2; The light rays that is penetrated by light source 11 is projecting on the screen 15 behind lamp optical system 12, pictcure generator 13, projection lens 14.Wherein, Fig. 1 is illustrated in the projecting lens that optical projection system has been used larger aperture, and corresponding bigger etendue, Fig. 2 are illustrated in the projecting lens that optical projection system is used smaller aperture due, corresponding less etendue.Usually; Light beam before lens arra becomes whole distribution; The beam components piece that goes out behind the lens arra distributes, and at the lens arra endpiece, and compares at the lens arra inlet end; Need on bigger zone, collect light and could obtain same energy, this needs to adopt bigger aperture projecting lens to collect luminous energy at the lens arra endpiece with regard to meaning.But wide-aperture projecting lens is difficult to design usually and makes, and cost is higher, and is unfavorable for the miniaturization of optical projection system.Therefore, consider to improve light harvesting effect, avoid because of making the problem that wide-aperture projecting lens brings as the optical lens array of light integrator.U.S. Patent application US2006/0044799A1 discloses the arrangement form with the part unit divergence form at an angle in the lens arra.U.S. Pat 6527393 discloses a kind of lens arra with the array element that improves shape.In addition, U.S. Patent application 2010/0165470A1 proposes before light is directed at the DMD lens, uses the lens arra with definite shape unit to come preparatory shaping light.Yet still there is very big deficiency in prior art improving on the collection efficiency of optical lens array.

The utility model content

The fundamental purpose of the utility model is exactly the deficiency to prior art, and a kind of optical lens device is provided, and lens that whereby can less light aperture are realized higher optical efficiency, optical element make easily and cost low.

Another purpose provides a kind of optical projection system with said optical lens device.

Another purpose provides a kind of imaging device with said optical lens device.

For realizing above-mentioned purpose, the utility model adopts following technical scheme:

A kind of optical lens device comprises the middle section and the neighboring area that allow light to see through, and said middle section is formed with lens arra, and said neighboring area has smooth surface.

Said neighboring area can have spherical or aspheric cross section.

The array element of forming said lens arra can be rectangle or hexagon.

Said neighboring area can be rectangle or hexagon or circle.

The optical lens material of said device can be PMMA (polymethylmethacrylate) or PC (polycarbonate) or glass.

Said lens arra can be arranged for rectangular arranged, ring shooting or divergence form.

A kind of optical projection system is characterized in that, comprising:

Light source,

Optical lens device, it comprises middle section and the neighboring area that allows light to see through, and said middle section is formed with lens arra, and said neighboring area has smooth surface;

Photomodulator, the light of said light emitted is imaged on said photomodulator surface through said optical lens device; With

Projection lens is used for the modulated light signal on the said photomodulator is imaged on screen.

Said neighboring area can have spherical or aspheric cross section.

The array element of forming said lens arra can be rectangle or hexagon.

Said neighboring area can be rectangle or hexagon or circle.

A kind of imaging device comprises aforementioned any optical lens device.

The utility model beneficial technical effects is:

Adopt the utility model, use the less projecting lens in aperture just can obtain to use the lens of larger aperture could obtain optical efficiency in the past;

Thus, make projecting lens make more easily and cost of manufacture lower;

Can adopt more cheap PBS (polarization splitting prism);

Can make system obtain higher optical efficiency, typically, system effectiveness can increase about 11.2% more in the past;

Can obtain littler photo engine size;

Can keep lower processing cost.

Description of drawings

Fig. 1 is illustrated in the projecting lens that optical projection system is used larger aperture;

Fig. 2 is illustrated in the projecting lens that optical projection system is used smaller aperture due;

Fig. 3 expresses existing lens arra;

Fig. 4 expresses lens arra and the lens perimeter zone among a kind of embodiment of the utility model;

Fig. 5 is a cross sectional view embodiment illustrated in fig. 4;

Fig. 6 expresses the light aperture when adopting the traditional optical lens arra;

Fig. 7 expresses the light aperture when adopting a kind of embodiment of the utility model.

Embodiment

Below combine accompanying drawing that the utility model is further specified through embodiment.

Fig. 1 has showed the light communication effect of traditional optical projection system at the projecting lens that uses different apertures with Fig. 2.Like Fig. 1, shown in 2, the light rays that is penetrated by light source 11 is projecting on the screen 15 behind lamp optical system 12, pictcure generator 13, projection lens 14.Wherein, Fig. 1 is illustrated in optical projection system and has used the bigger light source of the latitude of emulsion, so need to use the projecting lens of larger aperture; Corresponding bigger etendue; Fig. 2 is illustrated in optical projection system and uses the less light source of the latitude of emulsion, can use the projecting lens of smaller aperture due, corresponding less etendue.Used the lens arra of a routine among Fig. 2; This device evenly principle of illumination is: the light beam parallel with optical axis focuses on place, the second row lens center after arranging lens through first; First row's fly's-eye lens forms a plurality of light sources with light source and looks like to throw light on, and each lenslet of second row's fly's-eye lens is arranged the corresponding lenslet overlapping imaging of compound eye on illuminated area with first.Because first row's fly's-eye lens is divided into a plurality of light pencil illuminations with light source; And the small unevenness in each light pencil scope is owing to be in the mutual stack of symmetric position light beam; Make the small unevenness of light pencil obtain compensation, thereby make the luminous energy in the whole aperture obtain effectively evenly utilizing.From the irradiate light that the every bit of the hot spot of second row's compound eye outgoing is all received light source and sent a little, simultaneously, the light beam that every bit sends on the light source all can overlap onto again in the unified field range of the hot spot that throws light on, so obtain a uniform rectangular light spots.Fig. 3 has shown known lens arra.

See also Fig. 4 and Fig. 5; An embodiment according to the utility model; Optical lens device comprises the middle section 101 and neighboring area 102 that allows light to see through, and comprises that a lens arra of a plurality of lens units is formed on said middle section, and said neighboring area has smooth surface.Middle section and neighboring area all are provided with optical aperture and pass through to allow a certain proportion of light.

In certain embodiments, said neighboring area can have spherical or aspheric cross section.

In certain embodiments, the lens unit of forming said lens arra can be rectangle or hexagon.

In certain embodiments, said neighboring area can be rectangle or hexagon or circle.

In certain embodiments, the optical lens material of said optical lens device can be plastics such as PMMA or PC, also can be glass.

In certain embodiments, said lens arra can for rectangular arranged, ring shooting or appear from the middle part to around disperse form divergence form arrange.

According to the imaging device of an embodiment, can have the optical lens device of aforementioned arbitrary embodiment.

According to the optical projection system of an embodiment, can have the optical lens device of aforementioned arbitrary embodiment.

Optical projection system as shown in Figure 6 according to traditional design, needs to adopt the projecting lens of big optical aperture to be used to collect luminous energy at the lens arra endpiece.In optical projection system, light rays is projected on the screen 15 by light source 101, first optical lens module 102, lens array device 103, second optical lens module 104.Wherein, lens array device 103 is a traditional design, partly expresses the translucent effect that does not have the neighboring area with smooth surface with circle among the figure, and collection efficiency is lower.

Consult Fig. 7, the optical projection system of the utility model comprises light source, optical lens device, photomodulator and projection lens.In the optical projection system of an embodiment; The light of said light source 101 emissions is successively through first optical lens module 102, optical lens device 203 and the 3rd optical lens module 204; In the 3rd optical lens module 204; Photoimaging by optical lens device 203 penetrates is surperficial at photomodulator, again through behind the projection lens modulated light signal on the said photomodulator being imaged on the screen 105.

Optical lens device 203 comprises middle section and the neighboring area that allows light to see through, and said middle section is formed with lens arra, and said neighboring area has smooth surface, thus the collection efficiency that is improved.

Therefore; In optical projection system shown in Figure 7; Because optical lens device 203 is provided with middle section and the ganoid neighboring area (representing so that circle is partly outstanding among the figure) with lens arra; Use the projecting lens of smaller aperture due also can collect more luminous energy, guaranteed higher optical efficiency and more be prone to make.

Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.

Claims

1. An optical lens device, characterized in that it comprises a central area allowing light to pass through and a peripheral area, the central area is formed with a lens array, and the peripheral area has a smooth surface.

2. The optical lens device according to claim 1, wherein the peripheral region has a spherical or aspherical cross-section.

3. The optical lens device according to claim 1 or 2, wherein the array units constituting the lens array are rectangular or hexagonal.

4. The optical lens device according to claim 1 or 2, wherein the peripheral area is rectangular or hexagonal or circular.

5. The optical lens device according to claim 1 or 2, wherein the optical lens material of the device is PMMA or PC or glass.

6. The optical lens device according to claim 1 or 2, characterized in that, the lens array is a rectangular arrangement, an annular arrangement or a divergent arrangement.

7. A projection system, characterized in that it comprises:

light source,

an optical lens device comprising a central area through which light is allowed to pass, the central area being formed with a lens array, and a peripheral area having a smooth surface;

a light modulator, the light emitted by the light source is imaged on the surface of the light modulator through the optical lens device; and

The projection lens is used to image the modulated light signal on the light modulator on the screen.

8. The projection system of claim 7, wherein the peripheral area has a spherical or aspherical cross-section.

9. The projection system according to claim 9 or 10, characterized in that, the array units constituting the lens array are rectangular or hexagonal.

10. The projection system according to claim 9 or 10, wherein the peripheral area is rectangular or hexagonal or circular.

11. An imaging device, characterized by comprising the optical lens device according to any one of claims 1-6.