WO2023124807A1 - Dispositif de projection - Google Patents

Dispositif de projection Download PDF

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Publication number
WO2023124807A1
WO2023124807A1 PCT/CN2022/136613 CN2022136613W WO2023124807A1 WO 2023124807 A1 WO2023124807 A1 WO 2023124807A1 CN 2022136613 W CN2022136613 W CN 2022136613W WO 2023124807 A1 WO2023124807 A1 WO 2023124807A1
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WIPO (PCT)
Prior art keywords
lens
group
lens group
light
projection
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PCT/CN2022/136613
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English (en)
Chinese (zh)
Inventor
阴亮
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青岛海信激光显示股份有限公司
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Priority claimed from CN202111633706.8A external-priority patent/CN114296218A/zh
Priority claimed from CN202111631763.2A external-priority patent/CN114296217A/zh
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 WO2023124807A1 publication Critical patent/WO2023124807A1/fr

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    • 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

Definitions

  • the present disclosure relates to the technical field of projection display, and in particular, to a projection device.
  • Projection display technology refers to a technology that controls the light source by plane image information, and uses the optical system and projection space to enlarge the image and display it on the projection screen.
  • a projection device includes a light source, an optical machine and a lens.
  • the light source is configured to emit an illumination beam.
  • the optical machine is configured to modulate the illumination beam emitted by the light source to obtain a projection beam.
  • the lens is configured to image the projection beam.
  • the lens includes a first lens group and a second lens group.
  • the first lens group is located at the light exit side of the optical machine, and is configured to form an image of the projected light beam incident on the first lens group.
  • the first lens group includes a front group lens group, a middle group lens group and a rear group lens group.
  • the rear group mirror group, the middle group mirror group and the front group mirror group are arranged in sequence along a direction away from the optical machine.
  • the rear lens group includes a first sub-lens group, a second sub-lens group and a third sub-lens group.
  • the first sub-lens group is a doublet lens group.
  • the first sub-lens group is configured to reduce vertical chromatic aberration of the lens.
  • the second sub-lens group is a triplet lens group.
  • the second sub-lens group is configured to reduce vertical chromatic aberration of the lens and correct spherical aberration of the lens.
  • the third sub-lens group is a doublet lens group.
  • the third sub-lens group is configured to correct residual coma and field curvature of the lens.
  • the first sub-lens group, the second sub-lens group and the third sub-lens group are arranged in sequence along a direction away from the optical machine.
  • the second lens group is located on the light emitting side of the first lens group.
  • the second lens group is configured to re-image the projection light beam imaged by the first lens group and reflect it to a preset position.
  • the second lens group includes a mirror.
  • the reflector includes a first surface and a second surface.
  • the first surface is close to the front group lens group and is configured to transmit the projection light beam incident on the first surface.
  • the second surface is far away from the front group lens group and is opposite to the first surface.
  • the second surface is configured to reflect a projection beam incident on the second surface.
  • FIG. 1 is a structural diagram of a projection device according to some embodiments.
  • Fig. 2 is a partial structural diagram of a projection device according to some embodiments.
  • FIG. 3 is an optical path diagram of a light source, an optical machine, and a lens in a projection device according to some embodiments;
  • FIG. 4 is an arrangement diagram of tiny mirrors in a digital micromirror device according to some embodiments.
  • Fig. 5 is another optical path diagram of a light source, an optical machine and a lens in a projection device according to some embodiments;
  • FIG. 6 is a structural diagram of another projection device according to some embodiments.
  • Fig. 7 is a structural diagram of a lens according to some embodiments.
  • Fig. 8 is a structural diagram of another lens according to some embodiments.
  • FIG. 9 is a lateral chromatic aberration graph of a lens according to some embodiments.
  • Figure 10 is a ray fan diagram according to some embodiments.
  • Figure 11 is another ray fan diagram according to some embodiments.
  • Fig. 12 is another fan diagram of rays according to some embodiments.
  • Fig. 13 is another fan diagram of rays according to some embodiments.
  • Fig. 14 is another fan diagram of rays according to some embodiments.
  • Fig. 15 is another fan diagram of rays according to some embodiments.
  • Fig. 16 is another fan diagram of rays according to some embodiments.
  • Fig. 17 is another fan diagram of rays according to some embodiments.
  • Fig. 18 is another fan diagram of rays according to some embodiments.
  • Figure 19 is yet another ray fan diagram according to some embodiments.
  • first and second are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality” means two or more.
  • connection should be understood in a broad sense.
  • connection can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection or an indirect connection through an intermediary.
  • connection can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection or an indirect connection through an intermediary.
  • connection can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection or an indirect connection through an intermediary.
  • a and/or B includes the following three combinations: A only, B only, and a combination of A and B.
  • parallel As used herein, “parallel”, “perpendicular”, and “equal” include the stated situation and the situation similar to the stated situation, the range of the similar situation is within the acceptable deviation range, wherein the The stated range of acceptable deviation is as determined by one of ordinary skill in the art taking into account the measurement in question and errors associated with measurement of the particular quantity (ie, limitations of the measurement system).
  • Fig. 1 is a structural diagram of a projection device according to some embodiments.
  • the projection device 100 includes a complete machine housing 40 (only part of the complete machine housing 40 is shown in FIG. 1 ), a light source 10 assembled in the complete machine housing 40 , an optical engine 20 and a lens 30 .
  • the light source 10 is configured to provide an illumination beam.
  • the optical machine 20 is configured to use an image signal to modulate the illumination beam provided by the light source 10 to obtain a projection beam.
  • the lens 30 is configured to project the projection light beam on a screen or a wall to form an image.
  • the light source 10, the light engine 20 and the lens 30 are sequentially connected along the light beam propagation direction, and each is wrapped by a corresponding housing.
  • the housings of the light source 10 , the light engine 20 and the lens 30 support the corresponding optical components and make the optical components meet certain sealing or airtight requirements.
  • Fig. 2 is a partial structural diagram of a projection device according to some embodiments.
  • one end of the optical machine 20 is connected to the light source 10, and the light source 10 and the optical machine 20 are arranged along the outgoing direction of the illumination beam of the projection device 100 (refer to the M direction in Figure 2).
  • the other end of the optical machine 20 is connected to the lens 30 , and the optical machine 20 and the lens 30 are arranged along the outgoing direction of the projection light beam of the projection device 100 (refer to the N direction in FIG. 2 ).
  • the outgoing direction M of the illuminating light beam is approximately perpendicular to the outgoing direction N of the projection light beam.
  • this connection structure can adapt to the characteristics of the optical path of the reflective light valve in the optical machine 20.
  • the length of the optical path in one dimension is beneficial to the structural arrangement of the whole machine.
  • the length of the optical path in this dimension direction will be very long, which is not conducive to the structural arrangement of the whole machine.
  • the reflective light valve will be described later.
  • the light source 10 can sequentially provide the three primary colors of light (other colors can also be added on the basis of the three primary colors of light). white light formed. Alternatively, the light source 10 can also output the three primary colors of light at the same time, continuously emitting white light.
  • the light source 10 may include a laser that emits a laser beam of at least one color, such as a red laser beam, a blue laser beam or a green laser beam.
  • the laser may comprise a monochromatic laser. That is, the laser emits a laser beam of one color.
  • the light source 10 further includes a fluorescent wheel configured to convert the color of the laser beam under the irradiation of the laser beam emitted by the laser to obtain light of other colors.
  • the monochromatic laser can cooperate with the fluorescent wheel to emit light of different colors in time sequence.
  • the laser can also be a multicolor laser. That is, the laser emits laser beams of various colors.
  • the light source 10 includes a plurality of lasers emitting laser beams of different colors.
  • Fig. 3 is an optical path diagram of a light source, an optical engine and a lens in a projection device according to some embodiments.
  • the optical machine 20 includes a lens assembly 230 , a prism assembly 240 and a digital micromirror device (Digital Micromirror Device, DMD) 250 .
  • the lens assembly 230 is located on the light emitting side of the light source 10 , and the lens assembly 230 can converge the illumination beam provided by the light source 10 to the prism assembly 240 .
  • the prism assembly 240 is located on the light emitting side of the lens assembly 230 , and the prism assembly 240 is located between the DMD 250 and the lens 30 .
  • the prism assembly 240 reflects the illumination beam to the digital micromirror device 250 , and the digital micromirror device 250 modulates the illumination beam to obtain a projection beam, and reflects the projection beam to the lens 30 . It should be noted that the projected light beam emitted by the digital micromirror device 250 enters the lens 30 through the prism assembly 240 .
  • the digital micromirror device 250 uses the image signal to modulate the illumination beam provided by the light source 10, that is, to control the projection beam to display different brightness and gray scale for different pixels of the image to be displayed, so as to finally form an optical image, Therefore, the digital micromirror device 250 is also called a light modulation device or a light valve. According to whether the light modulation device (or light valve) transmits or reflects the illumination light beam, the light modulation device can be classified into a transmissive light modulation device or a reflective light modulation device. For example, the digital micromirror device 250 shown in FIG. 3 reflects the illumination light beam, that is, it is a reflective light modulation device.
  • the liquid crystal light valve transmits the illumination beam, so it is a transmissive light modulation device.
  • the optical machine 20 can be divided into a single-chip system, a two-chip system or a three-chip system.
  • the digital micromirror device 250 is applied in a DLP (Digital Light Processing, digital light processing) projection architecture, and the optical machine 20 shown in FIG. 3 uses a DLP projection architecture.
  • the light modulation device in some embodiments of the present disclosure is a digital micromirror device 250 .
  • FIG. 4 is an arrangement diagram of tiny mirrors in a digital micromirror device according to some embodiments.
  • the digital micromirror device 250 comprises thousands of tiny mirror mirrors 2501 that can be individually driven to rotate.
  • the lens 2501) corresponds to a pixel in the projected image to be displayed.
  • the image signal can be converted into digital codes such as 0 and 1 after being processed, and the tiny mirror 2501 can swing in response to these digital codes. Controlling the duration of each tiny reflective mirror 2501 in the on state and the off state respectively, to realize the gray scale of each pixel in a frame of image. In this way, the digital micromirror device 250 can modulate the illuminating light beam, and then realize the display of the projected picture.
  • the open state of the tiny reflective mirror 2501 is the state where the tiny reflective mirror 2501 is and can be maintained when the illumination light beam emitted by the light source 10 is reflected by the tiny reflective mirror 2501 and can enter the lens 30 .
  • the off state of the tiny reflective mirror 2501 is the state where the tiny reflective mirror 2501 is and can be maintained when the illumination light beam emitted by the light source 10 is reflected by the tiny reflective mirror 2501 and does not enter the lens 30 .
  • Fig. 5 is another optical path diagram of a light source, an optical engine and a lens in a projection device according to some embodiments.
  • the light machine 20 further includes a light homogenizing component 210 .
  • the homogenizing component 210 is located between the light source 10 and the lens assembly 230 , the homogenizing component 210 can receive the illumination beam provided by the light source 10 and homogenize the illumination beam.
  • the uniform light component 210 may include a light pipe, and the outlet of the light pipe may be rectangular, so as to have a shaping effect on the light spot.
  • the prism assembly 240 may adopt a total internal reflection (Total Internal Reflection, TIR) prism or a refraction total internal reflection (Refraction Total Internal Reflection, RTIR) prism, or may also be other types of prisms, and this disclosure does not make any reference to this limited.
  • TIR Total Internal Reflection
  • RTIR refraction total internal reflection
  • the optical machine 20 further includes a vibrating mirror 260 .
  • the vibrating mirror 260 is located between the prism assembly 240 and the lens 30, and the vibrating mirror 260 is configured to deflect the projected light beam.
  • the projection light beam modulated by the digital micromirror device 250 is incident on the vibrating mirror 260 after passing through the prism assembly 240, and the vibrating mirror 260 includes flat glass. The flat glass can be angularly displaced.
  • the flat glass when the flat glass vibrates at a higher frequency between different placement angles, the flat glass can transmit the projection light beam modulated by the digital micromirror device 250 to different positions of the lens 30 , thereby realizing image shift. Moreover, the flat glass can cooperate with the digital micromirror device 250 to vibrate, so that high-resolution image display can be realized without changing the physical resolution of the DMD 250. In this way, when the lens 30 cooperates with the digital micromirror device 250 and the vibrating mirror 260 , 4K high-resolution image display can be realized.
  • Fig. 6 is a structural diagram of another projection device according to some embodiments.
  • the projection device 100 further includes a projection screen 60 .
  • the projection screen 60 is disposed on the light emitting path of the lens 30 and is configured to receive the projection light beam emitted by the lens 30 for image display.
  • the projection screen 60 may be a curtain or a wall, which is not limited in the present disclosure.
  • the projection light beam emitted from the lens of the projection device is projected onto a curtain or a wall, and is reflected into human eyes through the curtain or wall, so as to realize the display of the projected image.
  • the lens of the projection device such as a projector
  • the projection screen there needs to be a certain distance between the lens of the projection device (such as a projector) and the projection screen to make the projection picture clear.
  • the object will block the projection light beam emitted by the lens, so that the projection picture on the projection screen will be missing and the display effect will be affected.
  • the projection device In order to prevent the object from blocking the lens and affecting the display effect, the projection device usually adopts an ultra-short-focus lens.
  • the ultra-short-focus lens due to the short projection distance of the ultra-short-focus lens, the requirement for a large field of view and high imaging requirements, and the cost and miniaturization of the projection equipment must be considered when designing the lens, which makes the design of the lens more difficult.
  • the wavelength of the light emitted by the light source has changed from 620nm to 645nm. Since the lens has different chromatic aberrations for different wavelengths of light, the lens designed based on the wavelength within 620nm is not suitable for the wavelength within 645nm, and the projection screen of the projection device is prone to color shift.
  • some embodiments of the present disclosure provide a lens 30 .
  • the lens 30 in some embodiments of the present disclosure is described in detail below.
  • FIG. 7 is a block diagram of a lens according to some embodiments.
  • the lens 30 includes a first lens group 301 and a second lens group 302 .
  • the first lens group 301 is located at the light output side of the optical machine 20 , and the first lens group 301 is configured to form an image of the projected light beam incident on the first lens group 301 .
  • the second lens group 302 is located on the side of the first lens group 301 away from the optical machine 20 (ie, the light exit side of the first lens group 301), and the second lens group 302 is configured to project the image formed by the first lens group 301
  • the beam is imaged again, and the re-imaged projection beam is reflected to a predetermined position.
  • the preset position may refer to the position where the projection screen 60 is located.
  • the projected light beam emitted by the light valve can pass through the first lens group 301 and then pass through the first lens group 301 and the second lens group 301.
  • the first imaging is performed between the two lens groups 302
  • the second imaging is performed on the projection screen 60 at the preset position after being reflected by the second lens group 302 .
  • the projection screen 60 may be disposed on a side of the first lens group 301 away from the second lens group 302 . In this way, the distance between the lens 30 and the projection screen 60 is small, and the probability of objects appearing between the lens 30 and the projection screen 60 is small, thereby reducing the situation that the screen is blocked, saving space, and facilitating the projection device 100. miniaturization.
  • the first lens group 301 includes a rear group lens group 3011 , a middle group lens group 3012 and a front group lens group 3013 .
  • the rear group mirror group 3011 , the middle group mirror group 3012 and the front group mirror group 3013 are arranged in sequence along the direction away from the optical machine 20 .
  • the front group lens group 3013 is close to the second lens group 302
  • the middle group lens group 3012 is located on the side of the front group lens group 3013 away from the second lens group 302
  • the rear group lens group 3011 is located at the side of the middle group lens group 3012 away from the front group lens One side of the group 3013, and close to the digital micromirror device 250.
  • the optical axes of the second lens group 302 , the rear group lens group 3011 , the middle group lens group 3012 and the front group lens group 3013 are collinear with each other.
  • the rear group lens group 3011 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, a Eight lenses 18 , a ninth lens 19 and an aperture stop 114 .
  • First lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, aperture stop 114, seventh lens 17, eighth lens 18, ninth lens 19 along The directions close to the second lens group 302 are arranged in sequence.
  • the aperture stop 114 is located between the sixth lens 16 and the seventh lens 17 and is configured to control the light flux of the lens 30 .
  • the diaphragm refers to an object that limits light beams in an optical system.
  • the aperture stop 114 refers to the stop that limits the imaging light beam (such as the above-mentioned projection light beam) the most in the optical system.
  • the first lens 11 , the second lens 12 , the third lens 13 , the fourth lens 14 , the fifth lens 15 , the sixth lens 16 , the seventh lens 17 , the eighth lens 18 and the ninth lens 19 are spherical lenses respectively.
  • the diopters of the first lens 11, the second lens 12, the fourth lens 14, the sixth lens 16, the seventh lens 17 and the eighth lens 18 are positive numbers respectively, and the third lens 13, the fifth lens 15 and the ninth lens 19
  • the diopters of are negative numbers. It should be noted that when light is incident from one object to another medium with a different optical density than the object, the propagation direction of the light will be deflected. This phenomenon is called refraction, and the diopter is Refers to the unit of refractive power of the medium in the refractive phenomenon.
  • the second lens 12 and the third lens 13 are cemented together to form the first sub-lens group 101 .
  • the first sub-lens group 101 is configured to reduce vertical chromatic aberration of the lens 30 .
  • the Abbe number of the second lens 12 is greater than the Abbe number of the third lens 13 , and the refractive index of the second lens 12 is smaller than that of the third lens 13 .
  • the Abbe number VD2 of the second lens 12 is any value in the range of 60-90 (60 ⁇ VD2 ⁇ 90), and the refractive index ND2 of the second lens 12 is less than 1.6 (ND2 ⁇ 1.6).
  • the Abbe number VD2 of the second lens 12 is 60, 70, 75, 80, or 90.
  • the Abbe number is also called "dispersion coefficient", and the Abbe number is an index used to represent the dispersion ability of a transparent medium.
  • the larger the refractive index of the medium the more serious the dispersion of light passing through the medium, and the smaller the Abbe number of the medium; the smaller the refractive index of the medium, the lighter the dispersion of light passing through the medium, and the smaller the Abbe number of the medium.
  • the dispersion refers to a phenomenon in which polychromatic light is decomposed into monochromatic light to form a spectrum. For example, since different colors of light correspond to different refractive indices when propagating in the medium, the different colors of light have different propagation paths when propagating in the medium, resulting in dispersion phenomenon.
  • the fourth lens 14 , the fifth lens 15 and the sixth lens 16 are cemented together to form the second sub-lens group 102 .
  • the Abbe number of the fourth lens 14 is greater than the Abbe number of the fifth lens 15
  • the Abbe number of the fifth lens 15 is smaller than the Abbe number of the sixth lens 16 .
  • the refractive index of the fourth lens 14 is smaller than that of the fifth lens 15
  • the refractive index of the fifth lens 15 is greater than that of the sixth lens 16 .
  • the Abbe number VD5 of the fifth lens 15 is any value in the range of 20-35 (20 ⁇ VD5 ⁇ 35), and the refractive index ND5 of the fifth lens 15 is greater than 1.85 (ND5>1.85).
  • the Abbe number VD6 of the sixth lens 16 is any value in the range of 60-90 (60 ⁇ VD6 ⁇ 90).
  • the Abbe number VD5 of the fifth lens 15 is 20, 25, 27, 30, or 35, and the Abbe number VD6 of the sixth lens 16 is 60, 70, 75, 80, or 90.
  • the eighth lens 18 and the ninth lens 19 are glued together to form the third sub-lens group 103 .
  • the Abbe number of the eighth lens 18 is smaller than that of the ninth lens 19 , and the refractive index of the eighth lens 18 is greater than that of the ninth lens 19 .
  • the Abbe number VD8 of the eighth lens 18 is any value in the range of 20-35 (20 ⁇ VD8 ⁇ 35), and the refractive index ND8 of the eighth lens 18 is greater than 1.7 (ND8>1.7).
  • the Abbe number VD9 of the ninth lens 19 is any value in the range of 30-60 (30 ⁇ VD9 ⁇ 60).
  • the Abbe number VD8 of the eighth lens 18 is 20, 25, 27, 30, or 35, and the Abbe number VD9 of the ninth lens 19 is 30, 40, 45, 50, or 60.
  • materials can be selected according to the Abbe number or the range of the refractive index of each lens for processing.
  • the first sub-lens group 101 , the second sub-lens group 102 and the third sub-lens group 103 are used to reduce chromatic aberration caused by light of different wavelengths, so that the spectral range of the lens 30 can reach 450nm-645nm.
  • the first sub-lens group 101 and the second sub-lens group 102 can reduce the vertical axis chromatic aberration of the lens 30, the second sub-lens group 102 can also correct the spherical aberration of the lens 30, and the third sub-lens group 103 can correct the lens 30 Residual coma and field curvature of the middle aperture stop 114. In this way, the chromatic aberration can be effectively corrected, the processing accuracy requirement of the lens 30 can be reduced, and the design and manufacture of the lens 30 can be facilitated.
  • the aperture stop 114 to limit the luminous flux of the lens 30, and make the luminous flux of the lens 30 correspond to the F-number of the lens 30, the light rays with larger aberrations at the edge positions in the projection beam can be shielded, Improve the display effect of the projection screen.
  • the F number refers to the reciprocal of the relative aperture of the lens 30 .
  • chromatic aberration refers to the difference caused by different heights on the image plane after light beams of different wavelengths in the off-axis field of view pass through the lens.
  • the spherical aberration refers to the aberration caused by the misalignment of the corresponding image points on the optical axis due to the different projection angles of the object points of the optical axis on the lens.
  • the conical light beam emitted by an off-axis object point cannot converge into a clear point at the ideal image plane after being refracted by the optical system, but a spot in the shape of a comet.
  • the imaging error of this optical system is called coma .
  • the field curvature means that after the light beam passes through the optical system, the intersection point of the light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface. This phenomenon is called field curvature. song.
  • the middle group lens group 3012 includes the tenth lens 110 .
  • the tenth lens 110 may be a spherical lens, and the diopter of the tenth lens 110 is a positive number.
  • the middle group lens group 3012 is movable.
  • the middle group lens group 3012 moves along the direction of the optical axis of the middle group lens group 3012 .
  • the middle group lens group 3012 can also be aligned along the front group lens group 3012 or the rear lens group.
  • the direction of the optical axis of the group lens group 3011 or the second lens group 302 moves.
  • the front group lens group 3013 includes an eleventh lens 111 , a twelfth lens 112 and a thirteenth lens 113 .
  • the eleventh lens 111 , the twelfth lens 112 and the thirteenth lens 113 are arranged in sequence along a direction close to the second lens group 302 .
  • the eleventh lens 111 and the twelfth lens 112 may be spherical lenses, and the thirteenth lens 113 may be an aspheric lens.
  • the diopter of the eleventh lens 111 and the thirteenth lens 113 may be a positive number, and the diopter of the twelfth lens 112 may be a negative number.
  • the thirteenth lens 113 may include a concave-convex aspheric lens. Since the diameter of the aspheric lens near the second lens group 302 needs to be larger, in order to reduce the manufacturing difficulty and cost of the aspheric lens, the thirteenth lens 113 can be made of plastic material.
  • the front group lens group 3013 is movable. By adjusting the relative positions of the front group lens group 3013 and the second lens group 302 , the distortion of the lens 30 under different sizes of projection images can be corrected.
  • the distortion refers to the aberration caused by the lens having different magnifications to different parts of the object when an object is imaged by the lens.
  • astigmatism can be effectively improved and distortion corrected by disposing an aspheric lens (eg, the thirteenth lens 113 ) at a position close to the second lens group 302 .
  • an aspheric lens eg, the thirteenth lens 113
  • the second lens group 302 includes a mirror 3021 configured to reflect the projected light beam emitted by the first lens group 301 for imaging.
  • the mirror 3021 includes a first surface S1 and a second surface S2.
  • the first surface S1 and the second surface S2 are oppositely disposed, and the first surface S1 is close to the front group lens group 3013 , and the second surface S2 is away from the front group lens group 3013 .
  • the first surface S1 is configured to transmit the projection beam incident to the first surface S1.
  • the second surface S2 is configured to reflect the projection beam incident to the second surface S2.
  • the projection beam emitted by the front group mirror group 3013 passes through the first surface S1 and enters the second surface S2, and is reflected by the second surface S2 to the projection screen 60 for projection imaging.
  • the chromatic aberration can be corrected through the first surface S1 and the second surface S2 respectively, and the two surfaces can be freely designed , improve the chromatic aberration correction effect of the lens 30, and reduce the design difficulty of the two surfaces.
  • the projection beam is mainly reflected by the second surface S2
  • the energy of the projection beam is mainly concentrated on the second surface S2
  • the second surface S2 is a part of the outer surface of the lens 30, compared with the first
  • the surface S1 makes it easier to install a heat dissipation device on the second surface S2 for heat dissipation, thereby improving the service life of the lens 30 .
  • Fig. 8 is a structural diagram of another lens according to some embodiments.
  • the first surface S1 is configured to reflect the light X1 of the first wavelength band and transmit the light X2 of the second wavelength band.
  • the second surface S2 is configured to reflect the light X2 of the second wavelength band.
  • the light X1 of the first wavelength band includes red light
  • the light X2 of the second wavelength band includes green light and blue light.
  • the first surface S1 reflects the red light, transmits the green light and the blue light
  • the second surface S1 S2 reflects green and blue light. Since human eyes are less sensitive to blue light, and the energy of green light and red light in the projection device 100 is relatively high. Therefore, the first surface S1 and the second surface S2 respectively reflect the red light and the green light, which can disperse the energy of the projected light beam on the two surfaces, avoiding damage to a single surface due to large light energy, thereby improving the use of the lens 30 life. Since the energy of green light is generally higher than that of red light, it is easier to install a cooling device for heat dissipation by irradiating the green light with higher energy on the second surface S2 near the outer side of the lens 30 .
  • the reflector 3021 may be a concave reflector configured to reduce the divergence angle of the projected light beam.
  • the reflector 3021 is a concave-convex double aspheric reflector or a double free-form surface reflector.
  • the projection device 100 performs imaging through the second lens group 302, and the second lens group 302 can compress the projected light beam in a large scale to realize large-size image display.
  • the second lens group 302 compresses the projected light beam in a large proportion, distortion is likely to occur, and the use of an aspheric mirror or a free-form mirror can effectively correct astigmatism and distortion, and improve the display effect of the projected picture.
  • the concave-convex double aspheric mirror or the double free-form surface mirror can also correct chromatic aberration, thereby improving the ability of the lens 30 to correct chromatic aberration.
  • the total diopter between the first lens group 301 and the second lens group 302 in the lens 30 is a positive number to converge light.
  • the equivalent focal length F of the lens 30, the equivalent focal length FB of the rear group lens group 3011, the equivalent focal length FM of the middle group lens group 3012, the equivalent focal length FF of the front group lens group 3013, and the second lens The equivalent focal length FC of group 302 satisfies the following relationship:
  • the equivalent focal length refers to: converting the imaging angle of view on photosensitive elements of different sizes into the lens focal length corresponding to the same imaging angle of view on the 135 model camera, the converted focal length is the equivalent focal length.
  • the 135 model camera refers to a camera using 135 model film.
  • 135 film is a roll-shaped photosensitive film with a height of 35mm perforated on both sides, also known as 35mm film, or Leica (Leica) film.
  • the throw ratio of the lens 30 adopting the above-mentioned telecentric structure can be any value within the range of 0.20-0.25, for example, the throw ratio of the lens 30 is 0.20, 0.21, 0.22, 0.23, 0.24 or 0.25.
  • the lens 30 in the projection device 100 can meet the requirements of using an ultra-short-focus lens, shorten the distance between the lens 30 and the projection screen 60, and can realize image display of 70 inches to 100 inches.
  • the shortest distance L3 between the rear surface of the projection device 100 and the projection screen 60 is much smaller than the size L4 of the projection screen.
  • the telecentric architecture means that the optical path of the projection beam modulated by the light valve (such as the digital micromirror device 250 ) needs to enter the lens 30 in a direction parallel to the optical axis of the lens 30 .
  • the length L1 of the first lens group 301 and the distance L2 between the first lens group 301 and the second lens group 302 satisfy the following relationship:
  • the distance L2 between the first lens group 301 and the second lens group 302, and the back working distance BFL of the lens 30 satisfy the following relationship:
  • the back working distance BFL of the lens 30 refers to the distance between the light valve (such as the DMD 250) and the last surface of the lens 30 where the projected light beam is incident.
  • the optical system designed with the above structure can increase the back working distance BFL of the lens 30 while the size of the lens 30 is small. In this way, it is beneficial to arrange components such as the prism assembly 240 and the vibrating mirror 260, and it is beneficial to improve the resolution of the projected picture. Moreover, the structure of the lens 30 is compact.
  • the F number of lens 30 is 2.0
  • the effective focal length (Effective Focal Length, FFL) of lens 30 is 2.195mm
  • the displacement of image plane relative to optical axis is any value in the range of 140% to 150%, and the resolution of the lens can reach 93lp/mm.
  • the size of the projection screen of the device 100 can be any value in the range of 70 inches to 100 inches, and the throw ratio of the lens 30 (ie, the ratio of the projection distance to the length of the projection screen) can be any value in the range of 0.20 to 0.25.
  • the projection distance refers to the shortest distance between the lens 30 and the projection screen.
  • FIG. 9 is a graph of lateral chromatic aberration of a lens according to some embodiments.
  • the abscissa indicates lateral chromatic aberration, which can also be called vertical axis chromatic aberration, and the ordinate indicates the field of view or object height.
  • the two curves that are symmetrical about the vertical axis and located on both sides of the vertical axis are the positions of the Airy disk, and the four curves respectively represent the vertical axis chromatic aberration of light with wavelengths of 450nm, 525nm, 620nm, and 645nm. It should be noted that, since the wavelengths of the light of 620 nm and the light of 645 nm are similar, the curves corresponding to the light of 620 nm and 645 nm in FIG. 9 overlap.
  • the Airy disk refers to a light spot formed at a focal point due to diffraction when a point light source is imaged by a diffraction-limited lens.
  • a diffraction limited lens is an ideal lens without geometrical optical aberrations.
  • the size of a pixel is about 5.4 ⁇ m. Because the chromatic aberration of the light of each wavelength in Fig. 9 is less than 1.8 ⁇ m respectively, therefore, as shown in Fig. 9, the chromatic aberration of the light of red wavelength (620nm and 645nm), green wavelength (525nm) and blue wavelength (450nm) is less than or equals 0.3 pixels. In this way, in some embodiments of the present disclosure, the lens 30 can effectively improve the chromatic aberration caused by light of different colors, and the spectrum of the projection device 100 can be extended to 450nm ⁇ 645nm.
  • FIG. 10 is a ray fan diagram according to some embodiments
  • Fig. 11 is another ray fan diagram according to some embodiments
  • Fig. 12 is another ray fan diagram according to some embodiments
  • Fig. 13 is a ray fan diagram according to some embodiments Another ray fan diagram
  • FIG. 14 is another ray fan diagram according to some embodiments
  • FIG. 15 is another ray fan diagram according to some embodiments
  • FIG. 16 is another ray fan diagram according to some embodiments Figures
  • FIG. 17 is another ray fan diagram according to some embodiments
  • FIG. 18 is another ray fan diagram according to some embodiments
  • FIG. 19 is another ray fan diagram according to some embodiments.
  • Figures 10 to 19 respectively show the aberration values of light with wavelengths of 450nm, 525nm, 620nm, and 645nm on the horizontal axis and the vertical axis with the dominant wavelength light under normalized conditions of each field of view.
  • Any color can be regarded as a color formed by mixing a certain spectral color with a reference light source in a certain proportion, and the wavelength corresponding to this spectral color is the dominant wavelength.
  • the 10 graphs respectively represent 10 normalized fields of view, and the two graphs in each field of view are respectively the light fan diagrams of the lens 30 in the meridional direction and the sagittal direction,
  • the fan diagram is centered on the optical axis.
  • the horizontal axes P X and P Y in each graph represent the pupil height under the condition of the field of view, and the vertical axes EX and E Y represent the lateral aberration between each wavelength light and the main wavelength light.
  • the maximum scale used in the ten groups of light fan diagrams in Figure 10 is ⁇ 15 ⁇ m.
  • the curves corresponding to different wavelengths of light have a high degree of coincidence in each field of view, and the maximum value of the vertical axis is also small, which can effectively improve the color shift and improve the display effect of the projection screen.
  • the diffraction limit of the chromatic aberration correction of the projected image can be made within 0.3 pixels.
  • the diffraction limit means that an ideal object point is imaged by an optical system. Due to the limitation of diffraction, it is impossible to obtain an ideal image point, but a Fraunhofer diffraction image (Airy disk).
  • the aperture stop 114 by setting the aperture stop 114, the aspheric lens (the thirteenth lens 113) and the aspheric reflector or the free-form surface reflector (reflector 3021), the aberration of the large field of view can be corrected, and the performance of the lens 30 can be improved. resolution, and the lens 30 can realize high-quality image display in the spectral range of 450nm-645nm.

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

Abstract

L'invention concerne un dispositif de projection (100), qui comprend une source de lumière (10), une machine optique (20) et une lentille (30) ; la lentille (30) comprend un premier groupe de lentilles (301) et un second groupe de lentilles (302) ; le premier groupe de lentilles (301) comprend un groupe de lentilles avant (3013), un groupe de lentilles intermédiaires (3012) et un groupe de lentilles arrière (3011) ; le groupe de lentilles arrière (3011) comprend un premier sous-groupe de lentilles (101), un deuxième sous-groupe de lentilles (102) et un troisième sous-groupe de lentilles (103) ; le premier sous-groupe de lentilles (101) est un groupe de lentilles en doublet cimenté ; le deuxième sous-groupe de lentilles (102) est un groupe de lentilles en triplet cimenté ; le troisième sous-groupe de lentilles (103) est un groupe de lentilles en doublet cimenté ; le second groupe de lentilles (302) est configuré pour effectuer une ré-imagerie sur un faisceau de lumière de projection qui a subi une imagerie par le premier groupe de lentilles (301), et le réfléchir vers une position prédéfinie ; le second groupe de lentilles (302) comprend un réflecteur (3021) ; et le réflecteur (3021) comprend une première surface (S1) et une seconde surface (S2).
PCT/CN2022/136613 2021-12-29 2022-12-05 Dispositif de projection WO2023124807A1 (fr)

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CN202111633706.8 2021-12-29
CN202111633706.8A CN114296218A (zh) 2021-12-29 2021-12-29 一种投影镜头及投影系统
CN202111631763.2 2021-12-29
CN202111631763.2A CN114296217A (zh) 2021-12-29 2021-12-29 一种投影镜头及投影系统

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JP2011248365A (ja) * 2011-05-30 2011-12-08 Hitachi Ltd 投写型映像表示装置
CN103995354A (zh) * 2014-05-16 2014-08-20 北京理工大学 基于全息衍射光学元件的消色差的波导显示系统
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