WO2020119421A1 - Système d'imagerie par projection et dispositif de projection laser - Google Patents

Système d'imagerie par projection et dispositif de projection laser Download PDF

Info

Publication number
WO2020119421A1
WO2020119421A1 PCT/CN2019/120143 CN2019120143W WO2020119421A1 WO 2020119421 A1 WO2020119421 A1 WO 2020119421A1 CN 2019120143 W CN2019120143 W CN 2019120143W WO 2020119421 A1 WO2020119421 A1 WO 2020119421A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
projection
spherical
image
imaging system
Prior art date
Application number
PCT/CN2019/120143
Other languages
English (en)
Chinese (zh)
Inventor
阴亮
罗超
马铭晨
Original Assignee
青岛海信激光显示股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 青岛海信激光显示股份有限公司 filed Critical 青岛海信激光显示股份有限公司
Publication of WO2020119421A1 publication Critical patent/WO2020119421A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/0095—Relay lenses or rod lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam

Definitions

  • the present application relates to the field of laser projection, in particular to a projection imaging system and laser projection equipment.
  • Laser display projection technology is a new type of projection display technology currently on the market.
  • the pursuit of short-focus projection at a short distance has become a trend.
  • the miniaturization of projection equipment has become a new demand.
  • the projection lens is one of the core components of the laser projector.
  • the projection lens is very important from design to processing.
  • the embodiments of the present application provide a projection lens and a projection imaging system, which can solve the problem of a large projection lens volume.
  • the technical solution is as follows:
  • a projection imaging system including: a light valve for modulating a received illumination beam to generate an image beam, and outputting the image beam to a projection lens;
  • Projection lens used to image the image beam, including:
  • the refraction system is used to refract the image beam entering the refraction system into the reflection system;
  • the reflection system is used to reflect and image the image beam output by the refraction system onto the projection medium;
  • the refraction system includes a first lens group, a relay lens, a second lens group,
  • the first lens group includes a first aspheric lens, a cemented lens group composed of a triple cemented lens and a double cemented lens, and a second lens located between the triple cemented lens and the double cemented lens Aspherical lens;
  • Relay lenses include n lenses, 1 ⁇ n ⁇ 2;
  • the second lens group includes N lenses, 2 ⁇ N ⁇ 5.
  • a laser projection device including: a laser light source and the above-mentioned projection imaging system.
  • the first lens group of the refraction system of the projection lens includes a triplet lens and a doublet lens, and a combination of two aspherical lenses.
  • Both the triplet lens and the doublet lens It has high chromatic aberration correction ability, and the triplet lens and doublet lens cooperate with aspherical lens, which can correct five kinds of monochromatic aberration better, so that the projection lens can have higher chromatic aberration at the same time.
  • the ability to correct aberrations and aberrations can greatly reduce the number of conventional lenses and lens combinations used, so that the projection lens has a higher resolution and the number of overall lenses of the projection lens is correspondingly reduced.
  • the projection lens is divided into the first lens Group, relay lens, and second lens group, through the above first lens group to effectively correct chromatic aberration and aberration, can greatly reduce the correction burden of the relay lens and the second lens group on imaging, so that the relay lens and the first lens group
  • the two-lens group can use a smaller number of lenses, and the total number of lenses can be controlled within 20.
  • the lens composition of the above projection lens can effectively shorten the length of the projection lens, which is conducive to achieving a compact size projection lens, which is conducive to achieving a compact projection Imaging system.
  • the laser projection device provided by the present application includes a laser light source and the projection imaging system of the above embodiment, which is beneficial to realize miniaturization of the laser projection device.
  • FIG. 1-1 is a schematic diagram of the optical principle of a projection imaging system according to an embodiment of the present application.
  • Figure 1-2 is a schematic diagram of a projection imaging system based on Figure 1-1.
  • FIG. 2 is a schematic diagram of another projection imaging system involved in an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 7 is a schematic diagram of an imaging contrast simulation interface of a projection lens according to an exemplary embodiment of the present application.
  • FIG. 8 is a schematic diagram of spot light spot imaging of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 9 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 10 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 11 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 12 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 13 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • FIG. 14 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • 15 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • 16 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • 17 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • 18 is an optical characteristic curve diagram of a projection lens provided by an exemplary embodiment of the present application.
  • 19 is a schematic diagram of the principle of a system imaging optical path of a projection imaging system according to an exemplary embodiment of the present application.
  • FIG. 20 is a schematic diagram of the image beam direction in the projection imaging system according to an exemplary embodiment of the present application.
  • 21 is a schematic structural diagram of a laser projection device according to an exemplary embodiment of the present application.
  • FIG. 22 is a schematic diagram of the optical principle of a laser projection device according to an exemplary embodiment of the present application.
  • the projection imaging system includes a light valve 10 and an illumination light path part before the light beam enters the light valve 10.
  • the illumination light path part is usually composed of a plurality of lenses.
  • the illumination light path part is used to receive the light beam and homogenize the light beam. Magnification, or also including optical path turning, to meet the angle requirements of the light valve 10 on the incident light beam and the size of the incident light spot.
  • a schematic diagram of a DLP optical system is provided, and the light valve 10 is a reflective light modulation device.
  • the surface close to the light valve 10 is also provided with a prism 20 for reflecting the illumination light beam into the surface of the light valve 10 and guiding the light beam reflected by the light valve 10 into the projection lens 40.
  • the prism 20 may be a total internal reflection TIR prism (English: Total INterNal Reflection, abbreviated as: TIR), or a RTIR (Reverse Total INterNal Reflection, abbreviated as: RTIR) prism.
  • TIR Total INterNal Reflection
  • RTIR Reverse Total INterNal Reflection
  • FIG. 1-2 shows a schematic diagram of the projection imaging system architecture provided in FIG. 1-1.
  • the projection imaging system may include: a light valve 10, a TIR prism 20, and a projection lens 40.
  • the light valve 10 and the TIR prism 20 are sequentially arranged in a direction close to the projection lens 40.
  • the light valve is used to generate an image beam when exposed to light.
  • the light valve may be a digital micromirror device (English: Digital Micromirror Device, DMD for short), and the DMD chip is A reflective light modulation component that receives an illumination light beam and is driven by an image processing signal to invert at different angles, modulates the illumination light beam, and projects it into the lens.
  • DMD Digital Micromirror Device
  • the resolution of the device can be 2K, 3K or 4K resolution, the 2K resolution refers to the pixel value of each line of the device reaching or close to 2000, usually refers to the 2560 ⁇ 1440 resolution; the 3K resolution refers to The pixel value of each line of the device is at or close to 3000, usually referring to the resolution of 3200 ⁇ 1800; the 4K resolution refers to the pixel value of each line of the device reaching or close to 4096, usually referring to the resolution of 4096 ⁇ 2160
  • the TIR prism is used to project the image beam to the projection lens to improve the brightness and contrast of the image beam entering the lens.
  • FIG. 2 illustrates a schematic diagram of another projection imaging system involved in the projection lens provided in some embodiments of the present application.
  • the projection imaging system involved in the projection lens may further include: an image shift mirror group 30 located on the side of the TIR prism 20 close to the projection lens 40, the image shift mirror group used to reflect the TIR prism After the image beam is shifted, the shifted image beam is transferred to the projection lens.
  • the image shift mirror group vibrates so that the image beams corresponding to the two adjacent projected images passing through the image shift mirror group do not completely overlap, and the image beams corresponding to the two adjacent projected images are sequentially directed toward the projection lens .
  • the image shift mirror group may be a plate-shaped transparent device, such as a flat transparent glass.
  • the functions and positions of other devices in FIG. 2 can be referred to those of FIG. 1. This embodiment of the present application will not repeat them here.
  • a projection lens 40 is also provided, which can be applied to the implementation environment shown in FIG. 1-2 or FIG. 2. As shown in FIG. 3, the projection lens 40 includes:
  • the refraction system 41 and the reflection system 42 are sequentially arranged along the direction in which the image beam is incident and transmitted (ie, the X direction shown in FIG. 3) and share the optical axis L.
  • the refraction system 41 is used to refract the image beam entering the refraction system into the reflection system.
  • the refraction system is specifically used to perform aberration correction and chromatic aberration correction on the image beam entering the refraction system, and refract the image beam into the reflection system.
  • the reflection system 42 is used to reflect the image beam output by the refraction system to the projection screen.
  • the reflection system is specifically used to correct the distortion of the image beam output by the refraction system and reflect the image beam to the projection screen.
  • the refractive system 41 includes a triplet lens 4111 and a doublet lens 4112.
  • the first lens group of the refraction system of the projection lens and the projection lens in the projection imaging system includes a triplet lens and a doublet lens, and a combination of two aspheric lenses.
  • Both the cemented lens and the double cemented lens have a high chromatic aberration correction capability, and the three cemented lens and the double cemented lens cooperate with the aspherical lens to better correct five kinds of monochromatic aberrations, so that the projection can be made
  • the lens has a high chromatic aberration and aberration correction capability, which can greatly reduce the number of conventional lenses and lens combinations used, so that while the projection lens has a higher resolution, the number of overall lenses of the projection lens is correspondingly reduced.
  • the projection lens is divided into a first lens group, a relay lens, and a second lens group.
  • the above-mentioned first lens group effectively corrects chromatic aberration and aberration, which can greatly reduce the imaging correction burden of the relay lens and the second lens group Therefore, a smaller number of lenses can be used for the relay lens and the second lens group.
  • the lens composition of the above-mentioned projection lens can effectively shorten the length of the projection lens, which is beneficial to realize the miniaturization of the projection lens and the projection imaging system.
  • the above-mentioned refraction system 41 includes a first lens group 411, a relay lens 412, and a second lens that are sequentially arranged along the direction in which the image beam is incident and transmitted (ie, the X direction shown in FIG. 4) Group 413, the first lens group 411 includes a triplet lens 4111 and a doublet lens 4112.
  • a unit composed of multiple lenses is usually regarded as a group, and it can be intuitively moved as a unit as a whole.
  • the group is divided into two groups. Each of these two groups as a small whole can be displaced relative to each other.
  • the displacement here can be the adjustment of tolerance during assembly, or it can be implemented in conjunction with the lens zoom to achieve the group
  • the distance changes while changing the focal length of the lens.
  • the relative position of the lens between each group does not change, and each group has its own focal length parameter.
  • the first lens group 411, the relay lens 412, and the second lens group 413 may be referred to as a rear group, a middle group, and a front group.
  • the lens after having a higher aberration and chromatic aberration Under the premise of correction capability, the lens can have a large depth of field and a large tolerance range, that is, it can allow the movement of the focal plane and can also achieve the projection quality within the visual reception range.
  • the projection quality The effect is the best, but at 90 inches or 120 inches, the position of the focal plane is changed by moving the group and the middle group (distortion correction must be performed at the same time through the movement of the two groups), although the 100 inch is not the best Resolution ability, but still meet the visual viewing requirements, that is, have a certain range of projection size adjustment, and at this time you need to have three groups of division, the rear group, the middle group move independently, that is, the first lens group 411
  • the relay lenses 412 each serve as a unit of adjustment, so that each is regarded as a group.
  • the above lenses can be divided into two groups, that is, the first lens group 411 is the rear group,
  • the relay lens 412 and the second lens group 413 are the front group, so that only the first lens group 411 is slightly displaced with respect to the remaining lens group, and is mounted as a whole when assembled.
  • the relay lens 412 maintains its relative position with respect to the second lens group 413.
  • the projection lens is exemplarily divided into three groups. This can be used to divide the beams of different groups in the case of a finer group division. And the contribution of each group to beam imaging, but this does not limit the division of the projection lens of this embodiment.
  • the relay lens may also be divided into the second lens group, so that the projection lens of this embodiment has two groups.
  • the projection lens 40 may be an object-side telecentric design structure, that is, the optical path of the projection lens is an object-side telecentric optical path, and in the projection lens of the object-side telecentric design structure, the light valve emits at the same point
  • the imaging beam does not change with the position of the light valve, which avoids the projection parallax caused by the inaccurate focus of the projection lens or the depth of field.
  • the image quality is better than the projection lens of the non-object telecentric design structure.
  • the range of the ratio of the second focal length to the first focal length is 2-12, the first focal length is the equivalent focal length of the projection lens, and the second focal length is the equivalent focal length of the first lens group;
  • the range of the ratio of the third focal length to the first focal length is 20-30, the third focal length is the equivalent focal length of the relay lens;
  • the range of the ratio of the fourth focal length to the first focal length is 25-35, the fourth focal length is The equivalent focal length of the second lens group;
  • the ratio of the fifth focal length to the first focal length is in the range of 5-10, and this fifth focal length is the equivalent focal length of the reflection system.
  • the equivalent focal length is the focal length of the lens corresponding to the same imaging angle of view on the 135 camera converted from the angle of view of the imaging elements of different sizes.
  • the reflection system 42 may be a concave aspheric mirror.
  • the first lens group 411 may be referred to as a rear group group
  • the first lens group 411 may include three cemented spherical lenses 4111 arranged in sequence along the direction of incidence and transmission of the image beam, and the third lens of positive power The two aspherical lens 4118 and the double cemented spherical surface 4112.
  • the first lens group 411 may include a first aspheric lens 4114 with positive power, a triple cemented spherical lens 4111, and a second with positive power, which are sequentially arranged along the direction of incidence and transmission of the image beam An aspheric lens 4118 and a double cemented spherical lens 4112.
  • the first lens group 411 may further include other lenses.
  • the first lens group 411 may include m lenses, where m is a positive integer, and 6 ⁇ m ⁇ 16.
  • the first lens group 411 includes 11 lenses, and the 11 lenses include 2 aspherical mirrors and 9 spherical mirrors.
  • the first lens group includes a first spherical lens 4113 of positive power, a first aspheric lens 4114 of positive power, a triple-glue spherical lens 4111, a negative power, and a negative power
  • F/# is a parameter that reflects the system's ability to collect or collect light
  • F/# f/d
  • f the focal length
  • d the aperture of the diaphragm
  • / indicates division number. The smaller the value of F/#, the stronger the system's ability to receive or collect light.
  • the projection lens adopts the telecentric design structure of the object side, but the projection lens under the telecentric design structure of the object side is compared with the projection lens of the telecentric design structure of the non-object side The difference is larger, so a larger aberration needs to be eliminated.
  • a lens close to the light valve can be used to undertake the main aberration correction function of the projection lens.
  • the first spherical lens 4113 is the first lens of the first lens group (also called the rear group). Since the first spherical lens 4113 is close to the light valve, the first spherical lens 4113 can play a role
  • the projection lens has a large aberration correction effect. Therefore, it is necessary to select a material with a large refractive index. The larger the refractive index, the stronger the ability to correct aberration. For example, the range of the refractive index of the material may be greater than 1.62. .
  • the correction aberration ability can be selected according to the situation A slightly lower aspheric lens is used as the first aspheric lens 4117 to perform aberration correction.
  • the higher the refractive index of the material the greater the chromatic aberration it produces.
  • the first aspherical lens chooses a lower refractive index s material.
  • the first aspherical lens may be made of glass material with a model number of L-BSL7, D-K59 or L-BAL42.
  • the value of the refractive index of the material may be about 1.5.
  • the first aspheric mirror mainly corrects the astigmatism, coma and field curvature of the projection lens.
  • the first spherical lens and the first aspheric lens can be replaced by the first lens, that is, the first lens group includes the first optical power of the positive power arranged in sequence along the direction of the image beam incidence and transmission One lens, triplet spherical lens, second spherical lens with negative power, third spherical lens with positive power, fourth spherical lens with negative power, second aspheric lens with positive power, double cemented spherical surface Lens, thereby further reducing the volume of the projection lens and reducing costs.
  • the first lens may be a spherical lens.
  • the triplet spherical lens 4111 includes: a fifth spherical lens c of positive power, a sixth spherical lens b of negative power, and a third of positive power, which are sequentially arranged along the direction of incidence and transmission of the image beam Seven spherical lens a.
  • the three-glue spherical lens 4111 is mainly for correcting the chromatic aberration of the projection lens, and at the same time has a certain correction capability for the aberration of the projection lens.
  • the three lenses in the triple-glue lens should be matched with materials whose Abbe number (also called dispersion coefficient) difference is greater than the first specified threshold.
  • the specified threshold may be determined in combination with other configuration conditions of the projection lens.
  • the range of the first specified threshold may be 30-80. Therefore, after selecting the Abbe number of the sixth spherical lens b as small as possible, the Abbe numbers of the fifth spherical lens c and the seventh spherical lens a are larger within the first specified threshold range.
  • the sixth spherical lens b The value range of the Abbe number of b may be less than 35, for example, 31.3.
  • the value range of the Abbe number of the fifth spherical lens c and the seventh spherical lens a may be 65-95, for example, the fifth spherical lens c
  • the Abbe number can be 70 or 90.
  • the Abbe number above is used to indicate the dispersion capacity of a transparent medium.
  • the The six spherical lens selects a negative power lens to make the image beam pass through the thinner area of the sixth spherical lens, thereby improving the geometric optical transmission efficiency of the sixth spherical lens, that is, the sixth spherical lens transmits the image beam effectiveness.
  • the value range of the refractive index of the sixth spherical lens may be greater than 1.8
  • the value range of the refractive index of the fifth spherical lens may be 1.45-1.55.
  • the second spherical lens 4115 is a meniscus spherical lens
  • the third spherical lens 4116 is a biconvex spherical lens
  • the fourth spherical lens 4117 is a double concave spherical lens
  • the second aspheric lens 4118 is a positive-focus aspheric lens.
  • the second aspheric mirror 4118 is mainly used to correct the spherical aberration and curvature of field of the projection lens.
  • the double-glued spherical lens 4112 includes: an eighth spherical lens e of negative power and a ninth spherical lens d of positive power, which are sequentially arranged along the direction of incidence and transmission of the image beam.
  • the double-glued spherical lens 4112 is mainly used for correcting the chromatic aberration of the projection lens, and at the same time has a certain correction capability for the aberration of the projection lens.
  • the double-glue spherical lens 4112 since the image beam passes through the triple-glue spherical lens 4111, the residual chromatic aberration of the image beam of the projection lens of the image beam is relatively small, and the double-glue spherical lens 4112 has less chromatic aberration correction ability than the triple-glue spherical lens 4111. Therefore, the double cemented spherical lens 4112 can be used to accurately correct the remaining small chromatic aberration.
  • the eighth spherical lens e and the ninth spherical lens d in the double cemented spherical lens 4112 are selected from materials whose Abbe number difference is less than the second specified threshold. Collocation, the second specified threshold can be determined in combination with other configuration conditions of the projection lens.
  • the ratio of the Abbe number of the eighth spherical lens e to the ninth spherical lens d may be 0.5-2, for example 1.65; the Abbe number of the eighth spherical lens e and the ninth spherical lens d
  • the values of can be 40.76 and 25.68, in this case, the ratio of the Abbe number of the eighth spherical lens e to the ninth spherical lens d is about 1.59.
  • the power of the eighth spherical lens e may be negative, and the power of the ninth spherical lens d may be positive, and then the positive chromatic aberration generated by the image beam passing through the eighth spherical lens e and passing through the ninth
  • the negative chromatic aberration generated by the spherical lens d cooperates with each other, so that the eighth spherical lens e and the ninth spherical lens d can correct the chromatic aberration of the image beam to zero.
  • the relay lens 412 may be a single lens or a combination of two lenses. Preferably, in this embodiment, it is a single lens and a spherical lens.
  • the lens may be a positive power spherical lens .
  • the relay lens 412 has a positive lens characteristic, that is, has the ability to condense light, and is used to reduce the normalized height of the image beam output by the first lens group 411 on each lens in the second lens group 412.
  • the normalized height refers to the ratio of the effective aperture of the lens (that is, the maximum height corresponding to the beam range of the image beam) and the lens aperture (that is, the maximum diameter of the lens, that is, the height of the lens) when the image beam passes through a lens (The maximum height is parallel to the direction of the lens height), which is to reduce the longitudinal height of the image beam.
  • the size of each lens aperture in the second lens group 413 and the first lens group 411 can be reduced, which is beneficial to reducing the volume of the projection lens and reducing costs.
  • the surface shape of the one relay lens may be a plano-convex type or a biconvex type.
  • the second lens group (may be referred to as a front group) 413 includes N lenses, where N is a positive integer and 2 ⁇ N ⁇ 5.
  • the second lens group 413 includes 3 lenses, and the 3 lenses include 1 aspherical mirror and 2 spherical mirrors.
  • the second lens group 413 includes: a tenth spherical lens with positive power 4131, an eleventh spherical lens with negative power 4132, and a third aspheric surface with negative power, which are sequentially arranged along the direction in which the image beam is incident and transmitted Lens 4133.
  • the second lens group 413 is used to correct the distortion of the projection lens.
  • the third aspheric lens 4133 is mainly used to correct astigmatism, curvature of field and distortion.
  • the tenth spherical lens 4131 may have a biconvex shape with a refractive index of about 1.7, for example, 1.72, and a dispersion coefficient of 54.6.
  • the surface shape of the eleventh spherical lens 4132 may be a double-concave type, with a middle thickness of 3-3.5 mm, so that when the image beam passes through the eleventh spherical lens, the middle thickness can effectively reduce the image
  • the value range of the dispersion coefficient of the eleventh spherical lens may be greater than 50.
  • the refractive index of the third aspheric surface 4133 is about 1.5.
  • the processing method of the aspherical lens can be simplified, which further simplifies the processing of the projection lens and reduces the production cost.
  • the lens of the projection lens is usually made of glass material, but the price of the glass material is relatively high, and for the aspheric lens, the processing of the aspheric lens of the glass material is more difficult, and the third aspheric lens and the light valve The distance is longer, the diameter is larger, and it is more consumable. Therefore, the material of the third aspheric lens can be plastic, such as 480R, the price of the plastic material is lower, and for aspheric lens, the processing of the aspheric lens of plastic material Easier.
  • the projection lens further includes: an aperture stop, which is located in the first lens group.
  • an aperture stop which is located in the first lens group.
  • both sides of the aperture stop are spherical lenses, specifically, located in the second lens group
  • an aperture stop is used to limit the entrance pupil diameter. Since the two sides of the aperture stop are spherical lenses, compared with the case where aspheric lenses are distributed on both sides, the design difficulty of the lens can be reduced and the cost can be reduced.
  • the lens near the aperture stop needs to select a material with a small expansion coefficient.
  • the lens can be made of glass materials with model numbers L-TIM28, L-AM69HE and L-LALB.
  • the material with a smaller expansion coefficient can reduce the lens profile caused by the temperature change of the lens material ( That is, the R value, that is, the change of the radius of curvature of the lens, so as to reduce the influence of temperature drift on the projection lens.
  • the range of the effective focal length of the projection lens provided in the embodiment of the present application may be 1.964-3.273 mm (millimeters).
  • the effective focal length of the projection lens provided in this embodiment is 2.348 mm, which is an ultra-short throw projection lens.
  • the effective focal length is the distance from the main image plane to the paraxial image plane after the projection lens.
  • the projection ratio of the projection lens ⁇ 0.24 the projection ratio refers to the linear relationship between the linear distance between the mirror and the screen and the length of the projection screen, that is, the projection distance/screen length
  • the size and projection ratio reflect the ultra-short throw characteristics of the lens.
  • the size of the projection screen of the projection lens may be 90-120 inches, and the projection ratio is 0.23-0.25.
  • the ultra-short throw projection lens has a smaller projection (less than 1). Therefore, the projection lens can be placed close to the projection screen, saving a lot of space. It avoids the blocking of the image beam when it needs to be close to the projection screen.
  • the distance between the second lens group and the reflector is relatively fixed, and by moving the first lens group, the relay lens is relatively second
  • the distance of the lens group can realize the adjustment of the projection size.
  • the distance between the second lens group and the reflection mirror may be finely adjusted, and the adjustment distance range is within plus or minus 1 mm.
  • the distance between the second lens group and the reflector is relatively fixed, for example, 69.66971912 mm or 71 mm.
  • a triple cemented lens, a double cemented lens, and three aspherical lenses are used in conjunction with other lenses to have strong aberration and chromatic aberration correction capabilities.
  • the embodiments of the present application provide The resolution of a projection lens can usually be 93lp/mm (that is, the resolution required by 4K resolution), then the projection lens can parse an image of 4K resolution, so that the projection screen can present a higher-definition image, improving the user experience.
  • the total length of the refraction system is L1 (ie, the distance from the edge surface of the first spherical lens close to the light valve to the edge surface of the third aspheric lens close to the reflection system),
  • the distance between the refraction system and the reflection system is L2, where 1.4 ⁇ L1/L2 ⁇ 1.6. Since the thickness of the lens in the reflection system is negligible, the L2 can be the total length of the projection lens minus L1.
  • the number of lenses used is less than 16, so that the length of the projection lens is in the range of 197-203mm, and the length of the conventional projection lens is at least 210mm.
  • the number is also about 20 pieces.
  • the maximum value of the length of the projection lens is smaller than the minimum value of the length of the conventional projection lens, the length is smaller than the length of the conventional projection lens, and the maximum aperture of the lens in the projection lens is 52mm.
  • the maximum aperture of the lens in a conventional projection lens is 60 mm, and the maximum aperture is also smaller than the maximum aperture of a conventional projection lens. Therefore, the overall volume of the projection lens is small.
  • the projection lens when the projection lens includes: a first spherical lens, a first aspheric lens, a fifth spherical lens, a sixth spherical lens, a first Seven spherical lens, second spherical lens, third spherical lens, fourth spherical lens, second aspheric lens, eighth spherical lens, ninth spherical lens, relay lens, tenth spherical lens, eleventh spherical lens
  • the thickness of each lens (except the reflection system) of the projection lens along the direction of the image beam incident transmission is: 7.79925152mm, 7.02mm, 5.03mm, 1.5mm, 4.32mm , 3.5mm, 4.27622172mm, 1.8mm, 4.47553268mm, 1.5mm, 4.58mm, 6.11544835mm, 14.7mm, 3.5mm and 3.45mm.
  • the successive distances between the lenses of the projection lens along the direction of the image beam incidence transmission are: 0.249mm, 0.249mm, 0mm, 0mm, 0.93mm, 0.5mm, 0.3mm, 1.133mm, 0.6946996mm, 0mm, 7.42962132mm, 11.88678689mm, 2.63083486mm, 3.76248103mm and 69.66971912mm.
  • FIG. 7 is a schematic diagram of an imaging contrast simulation interface of a projection lens according to an embodiment of the present application, and is also a distortion analysis diagram of a projection imaging system.
  • the cross line (+) in FIG. 7 is pre-imaging
  • the cross (x) is the imaging position of the actual projection lens.
  • the higher the overlap rate of the cross line and the cross the lower the distortion value of the image and the lower the distortion of the image.
  • the pre-imaging position and the actual projection lens have a higher coincidence rate.
  • the maximum distortion value simulated in the simulation interface is 0.3841%. Therefore, the distortion of the imaging of the projection lens is low.
  • FIG. 8 is a schematic diagram of a point array simulation interface of a projection lens provided by an embodiment of the present application, which is also called a schematic diagram of spot light imaging.
  • Fig. 8 light rays with wavelengths of 0.4550um, 0.5500um and 0.6200um are drawn respectively.
  • the spot light spots on the projection screen are imaged after passing through the projection lens, and the 10 fields of view are respectively labeled 1-10 logo.
  • “+” indicates spot imaging of light with a wavelength of 0.4550um
  • ⁇ indicates spot imaging of light with a wavelength of 0.5500um
  • ⁇ indicates spot imaging of light with a wavelength of 0.6200um.
  • the scale bar in FIG. 8 (the SCALE BAR logo is used in FIG. 8) is 40, that is, the size ratio of the image shown in FIG. 8 to the real image is 1:40, and the dotted line A in FIG. 8 records the label (FIB is used in FIG.
  • the simulated root mean square radius values (using the RMS and RADIUS logo in Figure 8) are 1.744, 1.497, 1.546, 1.906, 2.222, 2.356, 2.492, 3.245, 3.848 and 3.532, the geometric radii are 3.430, 3.765, 2.755, 4.492, 5.680, 5.986, 5.880, 9.316, 11.737 and 10.903, then the image size of the spot light spot on the projection screen is ⁇ 11.737um, which is close to the diffraction limit of 1.392um, therefore, the The image quality of the projection lens has a high contrast.
  • FIGS. 9 to 18 are normalized optical characteristic curves of the 10 different fields of view labeled 1-10 shown in FIG. 9 of the projection lens provided in the embodiment of the present application shown in FIG. 9
  • the optical characteristic curve is also called the ray fan diagram (English: ray faN).
  • the optical characteristic curve in each of FIGS. 9 to 18 is used to indicate that three wavelengths of light are relative to The difference between the dominant wavelength light (that is, the light passing through the light emitting point and the center point of the diaphragm) on the image plane.
  • the wavelengths of the three types of light are 0.4550um, 0.5500um and 0.6200um, respectively.
  • each optical characteristic curve includes the image synthesis error map M on the sagittal fan surface and the image synthesis error on the meridional fan surface.
  • Figure N In the coordinate system of the comprehensive error map M of the image on the sagittal fan surface, the horizontal axis PX is used to represent the normalized height of the light intake pupil on the sagittal fan, which passes through the pupil X The beam profile of the axis, EX is used to indicate the difference between the height of the image plane and the height of the chief ray of the current field of view on the image plane when the light passing through the specified pupil in the sagittal fan is incident on the image plane ; In the coordinate system of the integrated error map N of the image on the meridian fan, the horizontal axis PY is used to represent the normalized height of the light intake pupil on the meridian fan, which is the beam passing through the Y axis of the pupil The cross-section and the vertical axis EY are used to represent the difference between the height of the image
  • the material of the third aspheric lens can be plastic, which is beneficial to reduce the cost of the projection lens and reduce the difficulty of processing the projection lens.
  • an embodiment of the present application provides a projection imaging system.
  • the projection imaging system includes a light valve 10, a total internal reflection TIR prism 20, and a projection lens 40.
  • the projection lens 40 is any projection lens provided by the embodiments of the present application.
  • the light valve 10 and the TIR prism 20 are sequentially arranged in a direction close to the first lens group, and share an optical axis.
  • the light valve is used to generate an image beam when exposed to light.
  • the light valve may be a digital micromirror device (English: Digital Micromirror Device, DMD for short), and the resolution of the DMD may be 2K, 3K Or 4K resolution.
  • the TIR prism may be 2 total reflection prisms, or 2N total reflection prisms, and N is an integer greater than 1.
  • the projection imaging system further includes an image shift mirror group 30 that is located on the side of the TIR prism 20 near the projection lens 40.
  • the image shift mirror group is used to shift the image beam reflected by the TIR prism, and then transfer the shifted image beam to the projection lens.
  • the image shift mirror group 30 vibrates to sequentially pass the image shift
  • the image beams corresponding to the two adjacent projection images of the mirror group 30 do not completely overlap, and the image beams corresponding to the two adjacent projection images are sequentially directed to the projection lens 40.
  • the image shift mirror group may be a plate-shaped transparent device, such as a flat transparent glass.
  • the image shift mirror group may be driven by a motor or other equipment to perform high-frequency vibration, thereby achieving the The offset of the image beam, through the misalignment of the beams of the two consecutive projection screens, causes the projection screen to be misaligned and superimposed.
  • the temporary effect is used visually to obtain the clarity of the projection screen perceived by the human eye, thereby improving the projection display Resolution.
  • the distance from the light valve to the first spherical lens of the first lens group is the back working distance of the lens, due to the back working distance and back focal length (English: Back Focal LeNgth, abbreviation: BFL ) Are approximately equal, therefore, the back working distance is also commonly referred to as BFL, the distance L2 between the refraction system and the reflection system in the projection lens, where 0.3 ⁇ BFL/L2 ⁇ 0.55.
  • the total length of the refraction system is L1 (ie, the distance from the edge surface of the first spherical lens close to the light valve to the edge surface of the third aspheric lens close to the reflection system ), the distance between the refraction system and the reflection system is L2, where BFL satisfies: 0.05 ⁇ BFL/(L1+L2) ⁇ 0.25 to meet the ultra-short throw characteristics of the lens, that is, the characteristics of the ultra-short throw lens.
  • the offset of the light valve pixel plane relative to the optical axis satisfies the relationship: 132% ⁇ offset ⁇ 150%, the light valve pixel plane refers to the light valve reflecting the image beam flat.
  • the light valve DMD in order to cooperate with the miniaturization of the projection lens, the light valve DMD also adopts a small size model accordingly, so that the optical aperture exiting from the light valve is reduced, and the optical aperture of the projection lens lens It can also be smaller, which is conducive to the miniaturization of the projection lens volume.
  • the light valve uses a DMD of 0.47 inches.
  • FIG. 19 is a schematic diagram of the principle of the system imaging optical path of the projection imaging system according to the embodiment of the present application.
  • the light valve when the light valve is illuminated, the light valve outputs an image beam.
  • the image beam is reflected by the TIR prism to the image shift mirror group, and then passed to the refraction system 41.
  • the image beam passes through the After the refraction system 41, it is aggregated to a certain extent for the first imaging.
  • the reflection system 42 reflects the image beam out and performs the second imaging on the projection screen.
  • the screen displays the large-sized image obtained by the second imaging.
  • FIG. 20 is a schematic diagram of an image beam direction in a projection imaging system according to an embodiment of the present application.
  • the image beam is reflected onto the projection screen 50, and a large-sized image is displayed on the projection screen 50.
  • the first lens group of the refraction system of the projection lens and the projection lens in the projection imaging system includes a triplet lens and a doublet lens, and a combination of two aspheric lenses.
  • Both the cemented lens and the double cemented lens have a high chromatic aberration correction capability, and the three cemented lens and the double cemented lens cooperate with the aspherical lens to better correct five kinds of monochromatic aberrations, so that the projection can be made
  • the lens has a high chromatic aberration and aberration correction capability, which can greatly reduce the number of conventional lenses and lens combinations used, so that while the projection lens has a higher resolution, the number of overall lenses of the projection lens is correspondingly reduced.
  • the projection lens is divided into a first lens group, a relay lens, and a second lens group.
  • the above-mentioned first lens group effectively corrects chromatic aberration and aberration, which can greatly reduce the imaging correction burden of the relay lens and the second lens group Therefore, the relay lens and the second lens group can use a smaller number of lenses, and the total number of lenses can be controlled within 20.
  • the lens composition of the above-mentioned projection lens can effectively shorten the length of the projection lens, which is conducive to achieving a miniaturized projection lens , Conducive to miniaturization of the projection imaging system.
  • the light valve component uses a small-sized DMD chip, which is conducive to reducing the optical aperture entering the projection lens, can reduce the size of the lens, and is also conducive to the miniaturization of the projection lens volume.
  • FIG. 21 it is a schematic structural diagram of a laser projection device.
  • the laser projection device may be a laser theater or a laser TV, or other laser projections. instrument.
  • Fig. 22 shows a schematic diagram of the optical principle of a laser projection device.
  • the laser light source section 01 includes a laser light source unit 01, an optomechanical unit 02, and a lens unit 03.
  • the laser light source section 01, the optical machine section 02, and the lens section 03 can all be combined into an optical engine according to optical functions.
  • the laser light source section 01 is used to provide an illumination beam
  • the core component in the optomechanical section 02, a light valve is used to modulate the image signal of the illumination beam to form an image beam, and project the image beam into the lens section 03.
  • the lens section 03 includes a housing and a projection lens.
  • the projection lens includes a plurality of lens groups for correcting, magnifying and imaging the modulated image light beam, and projecting onto a projection medium to form a projection screen.
  • the various optical functional parts are connected in sequence along the beam propagation direction, and are wrapped by a housing that supports the optical components and enables each optical part to meet certain sealing or airtight requirements.
  • the laser light source section 01 may include a laser assembly and a fluorescence conversion system.
  • the laser assembly includes at least a blue laser assembly and emits blue laser light.
  • the fluorescence conversion system may be specifically a fluorescent wheel.
  • the blue laser component is used as the excitation light source to excite the fluorescent wheel to emit primary color light other than blue, and the blue laser light emitted by the blue laser as the blue primary color light and the fluorescent color generated by the fluorescent wheel are used together for image display Three-color illumination beam.
  • the laser light source section 01 may also be a pure three-color laser light source, including a blue laser component, a red laser component, and a green laser component, which emit blue laser light, red laser light, and green laser light respectively, and the three color lasers combine light to form an illumination beam .
  • the three-color illumination beam enters the optomechanical unit 02.
  • the optomechanical unit 02 includes the core light modulation component-the light valve.
  • the light valve reverses the positive and negative angles of the surface micro-mirror according to the drive signal corresponding to the image signal to complete Modulation of the illumination beam.
  • the modulated illumination light beam is projected into the optical part of the projection lens in the lens section 03 by the light valve, and is corrected, enlarged and imaged by a plurality of lens groups of the projection lens.
  • the optical portion in the optomechanical portion 02 and the optical portion in the lens portion 03 constitute the projection imaging system in the foregoing embodiment.
  • the light source 01 provides an illumination beam to the illumination optical path portion in the optical machine, and outputs it to the light valve 10, where the light valve 10 modulates the illumination beam and projects it into the projection lens 40 for imaging .
  • a laser light source, a light valve, and a projection lens are the core components of laser projection imaging.
  • the projection imaging system composed of the light valve and the projection lens please refer to the foregoing embodiments.
  • the composition and working principle of the projection lens can also refer to the foregoing embodiments of the projection lens.
  • the above laser projection equipment is used for a projection imaging system that uses a miniaturized type.
  • the laser light source can also be used.
  • a miniaturized laser array such as an MCL laser array, can output high brightness while the volume of the light source is still small.
  • Laser projection equipment can also be miniaturized.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

La présente invention concerne un système d'imagerie par projection et un dispositif de projection laser. Le système d'imagerie par projection comprend un modulateur de lumière (10) et une lentille de projection (40). Le modulateur de lumière (10) est utilisé pour moduler un faisceau de lumière de façon à générer un faisceau d'image, et pour délivrer le faisceau d'image à la lentille de projection (40). La lentille de projection (40) comprend un premier groupe de lentilles (411), une lentille de relais (412) et un second groupe de lentilles (413). Le premier groupe de lentilles (411) comprend, dans une direction de transmission d'un faisceau d'image incident, une première lentille non sphérique (4114), un groupe de lentilles collées constitué d'une lentille collée triple (4111) et une lentille collée double (4112), et une seconde lentille non sphérique (4118) située entre la lentille collée triple (4111) et la lentille collée double (4112). La lentille de relais (412) comprend n lentilles, où 1 ≤ n ≤ 2. Le second groupe de lentilles (413) comprend N lentilles, où 2 < N < 5. L'invention permet la miniaturisation de systèmes et de dispositifs d'imagerie par projection.
PCT/CN2019/120143 2018-12-10 2019-11-22 Système d'imagerie par projection et dispositif de projection laser WO2020119421A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811506490.7 2018-12-10
CN201811506490.7A CN111290101A (zh) 2018-12-10 2018-12-10 投影成像系统及激光投影设备

Publications (1)

Publication Number Publication Date
WO2020119421A1 true WO2020119421A1 (fr) 2020-06-18

Family

ID=71024141

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/120143 WO2020119421A1 (fr) 2018-12-10 2019-11-22 Système d'imagerie par projection et dispositif de projection laser

Country Status (2)

Country Link
CN (1) CN111290101A (fr)
WO (1) WO2020119421A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114253053B (zh) * 2020-09-21 2023-07-21 成都极米科技股份有限公司 一种投影镜头及投影设备
CN113504633B (zh) * 2021-06-29 2022-10-18 青岛海信激光显示股份有限公司 一种投影系统
CN114545713B (zh) * 2021-12-31 2024-06-11 歌尔光学科技有限公司 一种投影光学系统以及电子设备
WO2023124812A1 (fr) * 2021-12-31 2023-07-06 青岛海信激光显示股份有限公司 Dispositif de projection
CN115379181B (zh) * 2022-07-25 2024-06-28 青岛海信激光显示股份有限公司 微型投影设备及其光源的驱动方法
CN115980968B (zh) * 2022-12-13 2024-01-16 深圳昇旸光学科技有限公司 光学镜头模组及投影系统
CN116626969A (zh) * 2023-05-23 2023-08-22 深圳市易显传感技术有限公司 一种投影仪及面结构光系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060181757A1 (en) * 2005-02-17 2006-08-17 Kyocera Mita Corporation Image forming apparatus and image forming method
CN104880898A (zh) * 2015-05-13 2015-09-02 深圳市帅映科技有限公司 一种基于激光光源的dlp投影装置
CN107422458A (zh) * 2017-09-08 2017-12-01 杭州有人光电技术有限公司 一种低f数的l型短焦全高清投影镜头
CN108319002A (zh) * 2018-04-12 2018-07-24 北京数科技有限公司 一种镜头
CN108345090A (zh) * 2018-03-23 2018-07-31 杭州有人光电技术有限公司 一种f数的l型短焦全高清投影镜头
CN108710194A (zh) * 2018-07-17 2018-10-26 安徽仁和光电科技有限公司 投影镜头

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060181757A1 (en) * 2005-02-17 2006-08-17 Kyocera Mita Corporation Image forming apparatus and image forming method
CN104880898A (zh) * 2015-05-13 2015-09-02 深圳市帅映科技有限公司 一种基于激光光源的dlp投影装置
CN107422458A (zh) * 2017-09-08 2017-12-01 杭州有人光电技术有限公司 一种低f数的l型短焦全高清投影镜头
CN108345090A (zh) * 2018-03-23 2018-07-31 杭州有人光电技术有限公司 一种f数的l型短焦全高清投影镜头
CN108319002A (zh) * 2018-04-12 2018-07-24 北京数科技有限公司 一种镜头
CN108710194A (zh) * 2018-07-17 2018-10-26 安徽仁和光电科技有限公司 投影镜头

Also Published As

Publication number Publication date
CN111290101A (zh) 2020-06-16

Similar Documents

Publication Publication Date Title
WO2020119421A1 (fr) Système d&#39;imagerie par projection et dispositif de projection laser
CN111290100B (zh) 投影镜头及投影成像系统
KR20160073915A (ko) 초단초점 투사렌즈
CN111208701B (zh) 激光投影设备
CN113504633B (zh) 一种投影系统
CN112462491B (zh) 投影镜头及投影机
CN114296220A (zh) 一种投影镜头及投影系统
JP2015108797A (ja) 広角投影光学システム
CN114296218A (zh) 一种投影镜头及投影系统
CN114296217A (zh) 一种投影镜头及投影系统
WO2023070811A1 (fr) Système optique et dispositif de projection
CN114137708A (zh) 一种投影镜头及投影系统
CN113253557B (zh) 一种基于菲涅尔透镜的投影仪系统
CN116859557B (zh) 投影镜头及投影装置
JP5384415B2 (ja) 投写用広角レンズおよび投写型表示装置
WO2023124807A1 (fr) Dispositif de projection
WO2023124812A1 (fr) Dispositif de projection
CN115047591B (zh) 投影镜头以及投影装置
CN116149016A (zh) 一种投影镜头及投影系统
CN114114644A (zh) 一种投影镜头及投影系统
CN113359380A (zh) 光学引擎和激光投影设备
CN112444932B (zh) 投影镜头、投影镜头的调焦方法及装置、投影仪
CN215117147U (zh) 光学引擎和激光投影设备
CN112540442A (zh) 投影镜头、投影镜头的调焦方法及装置、投影仪
WO2020187204A1 (fr) Dispositif de projection laser

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19894705

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19894705

Country of ref document: EP

Kind code of ref document: A1