WO2019214317A1 - Projection device - Google Patents
Projection device Download PDFInfo
- Publication number
- WO2019214317A1 WO2019214317A1 PCT/CN2019/075892 CN2019075892W WO2019214317A1 WO 2019214317 A1 WO2019214317 A1 WO 2019214317A1 CN 2019075892 W CN2019075892 W CN 2019075892W WO 2019214317 A1 WO2019214317 A1 WO 2019214317A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lens
- twenty
- mirror
- mirror group
- projection apparatus
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
-
- 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
Definitions
- the present disclosure relates to the field of optical devices, and in particular to a projection device.
- projection imaging systems are increasingly used in people's work and life, such as education, office, home or entertainment.
- projection imaging systems such as projection imaging systems used in home theaters
- the higher the resolution of the projection imaging system the higher the user's viewing experience. Therefore, people are increasingly demanding projection imaging systems.
- Some embodiments of the present disclosure provide a projection apparatus that includes a light source and a digital micromirror element.
- the digital micromirror element is configured to receive and modulate light exiting the light source to form an image beam.
- the projection device further includes a refractor group and a mirror which are sequentially disposed along a traveling direction of the image beam emitted from the digital micromirror element.
- the refracting mirror group includes a first mirror group, a second mirror group, and a third mirror group that are sequentially disposed along a traveling direction of the image beam. The distance between the third mirror and the mirror is fixed.
- At least one of the first mirror group and the second mirror group is configured to be movable in a direction opposite to a traveling direction of the image beam or a traveling direction of the image beam to adjust the refractor group and the The focal plane of the projection imaging system consisting of mirrors.
- the diopter of the first mirror group and the second mirror group is positive, and the refracting power of the third mirror group is negative.
- FIG. 1 is a schematic illustration of an implementation environment of some embodiments of the present disclosure
- FIG. 2 is a schematic structural diagram of a projector provided by some embodiments of the present disclosure.
- FIG. 3 is a schematic structural diagram of another projector provided by some embodiments of the present disclosure.
- FIG. 4 is a schematic structural diagram of still another projector provided by some embodiments of the present disclosure.
- FIG. 5 is a schematic structural diagram of still another projector according to some embodiments of the present disclosure.
- FIG. 6 is a schematic structural diagram of still another projector according to some embodiments of the present disclosure.
- Figure 7 is a top plan view of the adjustment ring in the projector of Figure 5.
- Projector 20 can project an image beam onto screen 10 that is capable of forming an image on screen 12.
- the current development trend is to reduce the projection ratio of the projector 20 (the projection ratio is the ratio of the projection distance s and the screen width h, and the projection distance s is the distance between the projector 20 and the screen 10).
- the smaller the projection ratio the smaller the projected image can be projected by the projector at a shorter projection distance.
- Projectors with a small projection ratio are prone to various aberrations such as distortion (English: Distortion), astigmatism (English: Astigmatism), field curvature (English: Field Curvature), and coma (English: Coma).
- the related art ultra-short-throw projection apparatus generally adopts one of three modes of refraction, reflection, and hybrid to realize lens design.
- the hybrid lens generally includes a refractive lens group and a mirror group. This solution combines the characteristics of refraction and reflection to become the current mainstream design.
- the focal plane of the projection device can be adjusted by adjusting the distance between the mirror group and the mirror.
- FIG. 2 is a schematic structural diagram of a projection imaging system projector according to an embodiment of the present disclosure.
- the projection imaging system projector can be a projection imaging system projector 20 that is used in the implementation environment shown in FIG.
- Projection Imaging System Projector 20 provided by an embodiment of the present disclosure is for receiving a image beam and projecting onto a screen for imaging.
- the projection imaging system projector 20 provided by the embodiment of the present disclosure may also be, for example, a projection lens, which is applied in a projection device.
- the projector includes a light source, a digital micromirror component, and a projection imaging system.
- the digital micromirror element is configured to receive and modulate light exiting the light source to form an image beam.
- the projection imaging system 20 includes a refractive mirror group 22 and a mirror 23 that are sequentially disposed along the traveling direction of the light.
- the projection imaging system 20 further includes a light valve 21, and the refractive mirror group 22 and the mirror 23 are sequentially disposed along the light exiting direction of the light valve 21.
- the light valve 21 is not included in the projection imaging system 20, i.e., the light valve 21 is located outside of the projection imaging system 20 provided by embodiments of the present disclosure.
- the projection imaging system 20 can receive the light beam emitted by the light valve 21.
- the light valve 21 and the projection imaging system (projection lens) are located within the same projection device.
- the light valve 21 may be that the light valve may be a Digital Micromirror Device (DMD).
- DMD Digital Micromirror Device
- the above-described refractor group 22 includes a first mirror group 221, a second mirror group 222, and a third mirror group 223 which are sequentially arranged in the traveling direction d of light (i.e., image beam).
- the third mirror group 223 is also referred to as a front group mirror group
- the second mirror group 222 is also referred to as a middle group mirror group
- the first mirror group 221 is also referred to as a rear group mirror group.
- the distance L2 between the third mirror group 223 and the mirror 23 is fixed.
- Both the first mirror group 221 and the second mirror group 222 are movable in the traveling direction d of the light or in the opposite direction of the traveling direction d of the light to adjust the focal plane of the projection imaging system.
- the positions of the third mirror group 223 and the mirror 23 are fixed, and both the first mirror group 221 and the second mirror group 222 are movable in the traveling direction d of the light or in the opposite direction.
- the diopter of the first mirror group 221 and the second mirror group 222 is positive, and the refracting power of the third mirror group 223 is negative.
- the distance L2 between the third mirror group 223 and the mirror 23 is such that the distance between the mirror group 22 and the mirror 23 is fixed.
- the first mirror group 221 and the second mirror group 222 can be moved to adjust the focal plane of the projection imaging system while the distance between the third mirror group 223 and the mirror 23 remains unchanged, thereby avoiding large distortion.
- the projector provided by the embodiment of the present disclosure divides the refractor group into a first mirror group, a second mirror group, and a third mirror group, which are sequentially disposed in the traveling direction of the light, and makes the first The mirror group and the second mirror group are movable in the traveling direction of the light or in the opposite direction of the direction, that is, the focal plane of the projector can be adjusted without changing the distance between the mirror group and the mirror.
- the problem that the distortion of the picture caused by adjusting the distance between the refractor group and the mirror in the related art may be large, so that the image quality of the projector is low, and the imaging quality of the projector is high.
- the refractive mirror group 22 and the mirror 23 satisfy the first formula, and the first formula is: 0.9 ⁇ L1/L2 ⁇ 1.2.
- L1 is the length of the refractive mirror group 22, and L2 is the spacing between the refractive mirror group 22 and the mirror 23.
- L2 is a value within a preset range, which may be, for example, 69 mm (mm) to 91 mm.
- L2 can be 73mm or 87mm.
- L2 can be 69mm or 91mm.
- the L2 is an immutable value after the projector is shipped, so that it can stably control distortion at various projection sizes.
- the above distance or length is a length value in the d direction.
- the first mirror group 21, the second mirror group 22, and the third mirror group 23 of the refracting mirror group 22 satisfy the second formula, and the second formula is:
- F is the equivalent focal length of the refractor group 22
- FB is the equivalent focal length of the first mirror group 221
- FM is the equivalent focal length of the second mirror group 222
- FF is the equivalent focal length of the third mirror group 223
- FC It is the equivalent focal length of the mirror 23.
- the mirror 23 is a concave aspheric mirror or a free-form mirror, the concave curved surface of which is configured to receive the light emitted by the third mirror.
- the light valve 21 is, for example, a digital micromirror device (English: Digital Micromirror Device; abbreviation: DMD), and the DMD may be 2K resolution or 4K resolution.
- the light valve 21 includes a mirror array and a control circuit. When the light valve 21 is illuminated, the control circuit controls the mirror array to reflect the light beam emitted by the light source system, generates an image beam, and exits the projection imaging system.
- the light source refers to an optical component that provides a light beam for the light valve 21 in the projection device. The related art of how the light valve 21 specifically generates an image beam is not described herein.
- the projector provided by the embodiment of the present disclosure may include at least two structures, and the two structures are respectively described below as an example.
- a first configuration of a projector is capable of achieving high resolution (e.g., 4K) projection imaging.
- the projector 20 includes a refractive mirror group 22 and a mirror 23.
- the projector 20 also includes a vibrating lens 24.
- the vibrating lens 24 is located upstream of the refractor group in the optical path.
- the vibrating lens 24 may be disposed on the optical path between the light valve 21 and the refractor group 22.
- the vibrating lens 24 is configured such that the optical path of the image beam corresponding to the adjacent two frames of the vibrating lens does not completely overlap by the self-vibration, and the image beams corresponding to the adjacent two frames of the projected image are sequentially directed to the refractor group, and the projected image is projected.
- An image that is rendered on a projection screen after the image beam passes through the projection imaging system.
- the vibrating lens 24 can be a flat glass or other transparent substrate.
- the vibrating lens 24 is capable of vibrating such that light rays emerging in different vibration states have different offsets.
- the vibrating lens 24 vibrates such that the optical paths of the image beams corresponding to the adjacent two-frame projected images of the vibrating lens 24 do not completely overlap, so that the positions of the pixels of the same relative position in the adjacent pixel frames are not overlapped and have a certain offset.
- the resolution of the imaging is improved, and the image beam corresponding to the pixels of the same relative position of the adjacent two frames of the projected image is slightly staggered due to the vibration of the vibrating lens 24, thereby making the excessive transition between the pixels smoother, thereby improving the delicate feeling of imaging.
- the image quality is improved and high-resolution image quality is achieved.
- the projection imaging system projector may further include a total reflection prism 25.
- the total reflection prism 25 is located upstream of the vibrating mirror 24 in the optical path, for example, the total reflection prism 25 is located on the optical path between the light valve 21 and the vibrating lens 24.
- the total reflection prism 25 may include two glued total reflection prisms, respectively a first total reflection prism and a second total reflection prism (not shown in FIG. 3). The light beam emitted from the light valve 21 is first directed toward the first total reflection prism, and when the light beam is directed toward the first total reflection prism, the light beam is totally reflected, and the totally reflected light beam is directed to the light valve.
- the light valve 21 When the totally reflected light beam is directed to the light valve 21, the light valve 21 reflects the light beam to generate an image light beam, and then the generated image light beam is directed from the light valve 21 to the total reflection prism 25.
- the image beam When the image beam is directed from the light valve 21 to the total reflection prism 25, the image beam does not undergo total reflection, but directly directs the image beam toward the vibrating lens 24. Since the first total reflection prism causes total reflection of the light beam directed to itself, the total reflection prism 25 can be used to reflect the light beam onto the light valve 21, thereby eliminating the need for multiple reflections by a plurality of ordinary mirrors, thereby reducing The number of ordinary mirrors used greatly reduces the size of the projection imaging system projector.
- the total reflection prism 25 causes the light beam passing therethrough to become a uniform light beam parallel to the optical axis z, thereby satisfying the demand for the telecentric optical path, since the image beam generated by the light valve 21 is made uniform, thereby also improving the projected image. quality.
- the first mirror group 221 may include, for example, 11 lenses, the second mirror group 222 may include 3 lenses, and the third mirror group 223 may include 1 lens.
- the first mirror group 221 can be used to correct aberrations other than distortion, the second mirror group 222 can be used to correct chromatic aberration, and the third mirror group 223 can be used to correct distortion, and the third mirror group 223 and the mirror 23 can be used for correction. distortion.
- the first mirror group 221 may include a first lens a1, a second lens a2, a third lens a3, a fourth lens a4, a fifth lens a5, and a sixth lens which are sequentially disposed along the traveling direction d of the light.
- the second lens a2, the sixth lens a6, and the seventh lens a7 are aspherical lenses, and the lenses of the first lens group 221 other than the second lens a2, the sixth lens a6, and the seventh lens a7 are It is a spherical lens.
- the sixth lens a6 and the seventh lens a7 are used to enhance the resolution of the large field of view.
- the second lens a2 is used to improve the coma.
- the second lens a2 cooperates with the ninth lens a9 to increase the rear working distance of the lens.
- the first mirror group may further include a tenth lens a10 disposed between the ninth lens a9 and the eleventh lens a11, and the tenth lens a10 is used for temperature relaxation.
- the diopter of the tenth lens a10 is positive.
- the second mirror group 222 may include a twelfth lens a12, a thirteenth lens a13, and a fourteenth lens a14 that are sequentially disposed along the traveling direction d of the light, the twelfth lens a12 and the The thirteenth lens a13 has a positive dioptric power, and the fourteenth lens a14 has a negative dioptric power.
- the lenses in the second lens group 222 may all be spherical lenses.
- the third lens group 223 may include a fifteenth lens a15, and the fifteenth lens a15 is an aspherical lens.
- the fifteenth lens a15 is negative in diopter.
- the fifteenth lens a15 is used to improve astigmatism and distortion.
- the first mirror group 221, the second mirror group 222, the third mirror group 223, and the mirror 23 are located on the same main optical axis z.
- the second lens a2, the sixth lens a6, the seventh lens a7, and the fifteenth lens a15 are axially symmetric lenses.
- the first lens a1, the fifth lens a5, the sixth lens a6, and the tenth lens a10 are the meniscus lenses, and the convex portions of the fifth lens a5 and the sixth lens a6 are oriented toward the light. In the opposite direction of the direction d, the convex portion of the tenth lens a10 faces the traveling direction d of the light.
- the second lens a2, the third lens a3, the seventh lens a7, and the ninth lens a9 are lenticular lenses.
- the fourth lens a4, the eighth lens a8, and the eleventh lens a11 are biconcave lenses.
- the second lens a2 having a positive diopter is further provided between the first lens a1 and the third lens a3.
- the second lens a2 is an aspherical lens, and is preferably an axisymmetric aspherical lens.
- the second lens a2 is for improving the coma aberration, and the second lens a2 is engaged with the ninth lens a9 to increase the rear working distance of the lens.
- the back focal length (BFL) of the projection imaging system can reach a value between 20 mm and 34 mm.
- one side of the fourth lens a4 is combined with the third lens a3, and the other side of the fourth lens a4 is combined with the fifth lens a5 to reduce chromatic aberration.
- the third lens a3, the fourth lens a4, and the fifth lens a5 may be bonded together by gluing. The combination may be a mutual fit.
- the Abbe number of the fourth lens a4 is between 22 and 17, and the refractive index of the fourth lens a4 is greater than 1.8.
- the refractive indices of the third lens a3 and the fifth lens a5 are smaller than the refractive index of the fourth lens a4, and the Abbe numbers of the third lens a4 and the fifth lens a5 are larger than the Abbe number of the fourth lens a4.
- Abbe number (English: Abbe) is a physical quantity used to measure the degree of light dispersion of a medium. The greater the refractive index of the material, the stronger the dispersion and the lower the Abbe number.
- the tenth lens a10 and the eleventh lens a11 are combined with each other to reduce axial chromatic aberration.
- the tenth lens a10 and the eleventh lens a11 may be bonded to each other by gluing.
- the refractive index of the tenth lens is larger than that of the eleventh lens, and the Abbe number of the tenth lens is smaller than the Abbe number of the eleventh lens.
- the thirteenth lens a13 and the fourteenth lens a14 are combined with each other to reduce chromatic aberration.
- the refractive index of the thirteenth lens is smaller than the refractive index of the fourteenth lens, and the Abbe number of the thirteenth lens is larger than the Abbe number of the fourteenth lens.
- the thirteenth lens a13 and the fourteenth lens a14 may be bonded to each other by gluing.
- the third lens a3, the fourth lens a4, and the fifth lens a5 constitute a set of mutually coupled lenses
- the tenth lens a10 and the eleventh lens a11 constitute a set of mutually coupled lenses
- the thirteenth lens a13 and the fourteenth lens a14 form a set of mutually combined lenses, and the three sets of mutually combined lenses can be used to improve the spherical aberration of different spectra of the projector, and the axial chromatic aberration of the projector and the vertical The axial color difference is corrected.
- the diopter of the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the ninth lens, and the tenth lens is positive
- the fourth lens the first lens
- the diopter of the eight lens and the eleventh lens is negative.
- the overall diopter of the first mirror group 221 is positive.
- the dioptence of the twelfth lens in the second mirror group 22 is positive, the dioptric power of the thirteenth lens is positive, and the dioptric power of the fourteenth lens is negative.
- the overall diopter of the second mirror group 222 is positive.
- the fifteenth lens in the third lens group has a negative diopter.
- the distance from the light valve 21 to the first lens a1 is the back focus (English: Back Focus Length; BFL for short), and the BFL satisfies 0.29 ⁇ BFL/L2 ⁇ 0.37.
- the light incident surface of the seventh lens a7 may also be provided with an aperture.
- the structure shown in FIG. 3 is a secondary imaging structure. After the image beam of the light valve 21 passes through the refractor group, the first imaging is performed between the mirror and the refractor group, and the first image is reflected by the mirror and then on the screen. A second undistorted image is formed on the image.
- the projector provided by the embodiment of the present disclosure is compact overall, and the correction of the large field of view aberration by the aperture setting, the aspherical lens and the mirror improves the resolution of the projector, thereby realizing high-resolution imaging quality.
- the distance between the third mirror group 223 and the mirror 23 is fixed, and the distance between the first mirror group 221 and the second mirror group 222 can be adjusted.
- the distance between the mirror group 222 and the third mirror group 223 can also be adjusted.
- the effective focal length (English: Effective Focal Length) of the projector shown in FIG. 3 is -2.09 mm (mm), and the offset (English: offset) is 140% to 148%.
- the ability to achieve 93 line pairs / mm (lp / mm), can project a screen size of 80 to 120 inches, projection ratio of 0.20 to 0.22.
- Effective Focal Length -2.1 mm
- Offset 140% - 148%
- resolution of 93 lp / mm can be projected
- the screen size is 65 to 80 inches
- the projection ratio (projection distance/screen length direction) is 0.20 to 0.22.
- a second structure of a projector is capable of achieving projection imaging of an ultra-short focal length.
- the projector 20 includes a refractive mirror group 22 and a mirror 23.
- the first mirror group 221 includes 10 lenses, the second mirror group includes 3 lenses, and the third mirror group includes 1 lens.
- the first mirror group 221 includes a twenty-first lens a21, a twenty-second lens a22, a twenty-third lens a23, a twenty-fourth lens a24, a twenty-fifth lens a25, which are sequentially disposed along the traveling direction d of the light,
- the twenty-sixth lens a26 and the twenty-seventh lens a27 are aspherical lenses, and the lenses of the first mirror group 221 other than the twenty-sixth lens a26 and the twenty-seventh lens a27 are spherical lenses.
- the number of aspherical mirrors in the projector shown in FIG. 4 is small, and the number of lenses is also small, thereby reducing the cost and length of the projector.
- the refracting power of the twenty-fourth lens a24, the twenty-eighth lens a28, and the twenty-ninth lens a29 is negative, the twenty-first lens a21, the twenty-second lens a22, the twenty-third lens a23, the twenty-fifth The diopter of the lens a25, the twenty-sixth lens a26, the twenty-seventh lens a27, and the thirtieth lens a30 is positive.
- the twenty-third lens a23, the twenty-fourth lens a24, and the twenty-fifth lens a25 are sequentially glued together, and the twenty-ninth lens a29 and the thirty-th lens a30 are glued together.
- the twenty-fifth lens a25 and the twenty-sixth lens a26 are convex-concave lenses in which the convex portions are opposite to the traveling direction d of the light.
- the twenty-first lens a21, the twenty-second lens a22, the twenty-third lens a23, the twenty-seventh lens a27, and the thirtieth lens a30 are lenticular lenses.
- the twenty-fourth lens a24, the twenty-eighth lens a28, and the twenty-ninth lens a29 are biconcave lenses.
- the second mirror group 222 includes: a twelfth lens a12, a thirteenth lens a13, and a fourteenth lens a14 which are sequentially disposed in the traveling direction of the light; the twelfth lens a12 and the thirteenth lens a13 have a positive diopter, and the tenth The four lens a14 diopter is negative.
- the third mirror group a13 includes a fifteenth lens a15 having a negative diopter, and the fifteenth lens a15 is an aspherical lens.
- the projector shown in FIG. 4 can have an effective focal length of -2.1 mm, an offset of 140% to 148%, a resolution of 93 lp/mm, and a projected screen size of 65 to 80. Inches, the throw ratio is 0.20 to 0.22.
- the projector 20 includes a light valve 102, a total reflection prism 103, a first mirror group 120, a second mirror group 130, and a third mirror which are sequentially disposed along the optical axis 101.
- the third mirror group 140 includes an aspherical plastic lens, and the shape of the light-emitting surface of the lens is recurved, which is suitable for plastic injection molding.
- the shape of the fifteenth lens a15 in Fig. 4 is suitable for glass molding.
- the total reflection prism 103 is closer to the first lens of the second mirror group 120, the first lens of the second lens group 120 in the traveling direction of the light is a lenticular lens, and the second lens is a convex-concave lens. And the second lens is a spherical lens.
- the light valve 102, the total reflection prism 103, the remaining lenses of the first mirror group 120, and the second mirror group 130 are substantially similar to those of FIG. 4 and will not be described in detail.
- the distance between different lenses, groups of mirrors involved in some embodiments of the present disclosure is the distance on the optical axis z.
- the projector provided by the embodiment of the present disclosure splits the refractor group into a first mirror group, a second mirror group, and a third mirror group which are sequentially disposed along the traveling direction of the light, and the first A mirror group and a second mirror group are capable of moving the direction of travel of the light or the opposite direction of the direction to adjust the focal plane of the projector, that is, the projector can be adjusted without changing the distance between the mirror group and the mirror Focal plane.
- the problem that the distortion of the picture caused by adjusting the distance between the refractor group and the mirror in the related art may be large, so that the imaging quality of the projector is low is solved.
- the effect of high image quality of the projector is achieved.
- the first mirror group and the second mirror group can be moved in the traveling direction of the light or the opposite direction of the direction through various moving structures, as shown in FIG. 6 , which is A schematic structural diagram of a projector provided by an embodiment of the present disclosure.
- the projector further includes a first barrel A1, a main barrel A2, a second barrel A3, and a mirror barrel A4, the first mirror group being disposed in the first barrel A1 and the third mirror group being disposed in the main barrel A2
- the second lens group is disposed in the third lens barrel A3 (for convenience of explanation, only the partial lens in each lens group is shown in FIG. 5, the structure of the lens in each lens group may refer to the above embodiment), and the mirror is disposed at In the mirror barrel A4, the position of the main barrel A2 with respect to the mirror barrel A4 is constant to ensure that the position between the third mirror group and the mirror 23 is relatively fixed.
- the first barrel A1 and the main barrel A2 are rotatably connected by an adjusting ring C1.
- the adjusting ring C1 includes a first roller (Roller is a roller) C11 and a second roller C12, and the first roller C11 and the first barrel A1 is rotatably connected, the second roller C12 is rotatably connected to the main barrel A2, and the adjusting ring C1 is provided with a straight groove along the circumferential direction of the first barrel A1 which is engaged with the first roller C11 (not shown in FIG. 5).
- the adjusting ring C1 is further provided with a chute (not shown in FIG. 5) along the circumferential direction of the first barrel A1 in cooperation with the second roller C12.
- the adjustment ring C1 is relatively stationary with respect to the main barrel A2 in the traveling direction d of the light when it is rotated.
- the first roller C11 is connected to the first barrel A1, and the movement track groove of the first roller C11 is a chute. Therefore, when the adjustment ring C1 rotates, the first roller C11 is driven along the main barrel A2 along the light.
- the traveling direction d (or the opposite direction of the direction d) moves, thereby causing the first barrel A1 to move relative to the main barrel A2 in the traveling direction d of the light (or the opposite direction of the traveling direction d of the light).
- FIG. 7 is a top view of the adjustment ring C1 in the projector shown in FIG. 6, it can be seen that the adjustment ring C1 is provided with a straight groove g1 and a chute g2.
- connection between the main barrel A2 and the second barrel A3 is similar to that of the main barrel A2 and the first barrel A1, and will not be described herein.
- an embodiment of the present disclosure further provides a laser projection apparatus including a light source, a light valve, and the projection imaging system provided by the above embodiment; wherein the light valve modulates the laser beam incident from the light source to be projected to the projection Imaging system.
- the light valve is for example a digital micromirror element.
- the laser projection apparatus of the present disclosure can adjust the focal plane of the projection imaging system without changing the distance between the refractive mirror group and the mirror, avoiding image distortion caused by adjusting the distance between the refractive mirror group and the mirror, Improve the imaging quality of the projection imaging system.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Projection Apparatus (AREA)
Abstract
A projection device comprises a light source and a digital micro-mirror element. The digital micro-mirror element is configured to receive and modulate light emitted from the light source to form an image beam. The projection device further comprises a refractor set (22) and a reflector (23) sequentially provided along a traveling direction of the image beam emitted from the digital micro-mirror element. The refractor set (22) comprises a first lens group (221), a second lens group (222), and a third lens group (223) sequentially provided along the traveling direction of the image beam. A distance between the third lens group (223) and the reflector (23) is fixed, and at least one of the first lens group (221) and the second lens group (222) is configured to be capable of moving along the traveling direction of the image beam or moving along a direction opposite to the traveling direction of the image beam, so as to adjust a focal plane of a projection imaging system (20) consisting of the refractor set (22) and the reflector (23). The diopter of the first lens group (221) and the second lens group (222) is positive, and the diopter of the third lens group (223) is negative.
Description
本申请要求于2018年5月8日提交中国专利局、申请号为201810433755.9、发明名称为“投影成像系统及激光投影装置”,申请号为201810434257.6、发明名称为“投影镜头及激光投影装置”以及申请号为201810433710.1、发明名称为“投影成像系统及激光投影装置”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。This application is required to be submitted to the Chinese Patent Office on May 8, 2018, the application number is 201810433755.9, the invention name is "projection imaging system and laser projection device", the application number is 201101834257.6, the invention name is "projection lens and laser projection device" and The priority of the Chinese Patent Application No. 20181043371, entitled "Projection Imaging System and Laser Projection Apparatus", the entire contents of which is incorporated herein by reference.
本公开涉及光学设备领域,特别涉及一种投影装置。The present disclosure relates to the field of optical devices, and in particular to a projection device.
随着科学技术的提高,投影成像系统在人们工作和生活中的应用越来越广泛,比如教育、办公、家用或娱乐领域。对于投影成像系统,比如,家庭影院中使用的投影成像系统,投影成像系统分辨率越高,用户观影体验越高。因此,人们对投影成像系统的要求也越来越高。With the advancement of science and technology, projection imaging systems are increasingly used in people's work and life, such as education, office, home or entertainment. For projection imaging systems, such as projection imaging systems used in home theaters, the higher the resolution of the projection imaging system, the higher the user's viewing experience. Therefore, people are increasingly demanding projection imaging systems.
发明内容Summary of the invention
本公开的一些实施例提供了一种投影装置,所述投影装置包括光源和数字微镜元件。所述数字微镜元件被配置为接受并调制光源出射的光以形成影像光束。投影装置还包括沿着所述数字微镜元件出射的所述影像光束的行进方向依次设置的折射镜组和反射镜。所述折射镜组包括沿所述影像光束的行进方向依次设置的第一镜组、第二镜组和第三镜组。所述第三镜组与所述反射镜之间的距离是固定的。所述第一镜组和所述第二镜组的至少一个被配置为能够沿所述影像光束的行进方向或所述影像光束行进方向的反方向移动,以调节所述折射镜组和所述反射镜组成的投影成像系统的焦平面。所述第一镜组与所述第二镜组的屈光度为正,所述第三镜组的屈光度为负。Some embodiments of the present disclosure provide a projection apparatus that includes a light source and a digital micromirror element. The digital micromirror element is configured to receive and modulate light exiting the light source to form an image beam. The projection device further includes a refractor group and a mirror which are sequentially disposed along a traveling direction of the image beam emitted from the digital micromirror element. The refracting mirror group includes a first mirror group, a second mirror group, and a third mirror group that are sequentially disposed along a traveling direction of the image beam. The distance between the third mirror and the mirror is fixed. At least one of the first mirror group and the second mirror group is configured to be movable in a direction opposite to a traveling direction of the image beam or a traveling direction of the image beam to adjust the refractor group and the The focal plane of the projection imaging system consisting of mirrors. The diopter of the first mirror group and the second mirror group is positive, and the refracting power of the third mirror group is negative.
为了更清楚地说明本公开实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本公开的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present disclosure. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.
图1是本公开一些实施例的实施环境的示意图;1 is a schematic illustration of an implementation environment of some embodiments of the present disclosure;
图2是本公开一些实施例提供的一种投影仪的结构示意图;2 is a schematic structural diagram of a projector provided by some embodiments of the present disclosure;
图3是本公开一些实施例提供的另一种投影仪的结构示意图;3 is a schematic structural diagram of another projector provided by some embodiments of the present disclosure;
图4是本公开一些实施例提供的又一种投影仪的结构示意图;4 is a schematic structural diagram of still another projector provided by some embodiments of the present disclosure;
图5是本公开一些实施例提供的又一种投影仪的结构示意图;FIG. 5 is a schematic structural diagram of still another projector according to some embodiments of the present disclosure; FIG.
图6是本公开一些实施例提供的又一种投影仪的结构示意图;FIG. 6 is a schematic structural diagram of still another projector according to some embodiments of the present disclosure; FIG.
图7是图5所示投影仪中调节环处的俯视图。Figure 7 is a top plan view of the adjustment ring in the projector of Figure 5.
这些附图和文字描述并不是为了通过任何方式限制本公开构思的范围,而是通过参考特定实施例为本领域技术人员说明本公开的概念。The drawings and the text are not intended to limit the scope of the present disclosure in any way, and the description of the present disclosure will be described by those skilled in the art by reference to the specific embodiments.
为使本公开的目的、技术方案和优点更加清楚,下面将结合附图对本公开的实施方式作进一步地详细描述。The embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.
图1是本公开一些实施例的实施环境的示意图。投影仪20可以向屏幕10投射影像光束,该影像光束能够在屏幕12上形成图像。目前的发展趋势是降低投影仪20的投射比(投射比是投影距离s和画面宽度h的比值,投影距离s为投影仪20和屏幕10之间的距离)。投射比越小,投影仪就能够在越短的投影距离投射出越大的画面。投射比小的投影仪容易出现如畸变(英文:Distortion)、像散(英文:Astigmatism)、场曲(英文:Field Curvature)、慧差(英文:Coma)等各种像差。1 is a schematic diagram of an implementation environment of some embodiments of the present disclosure. Projector 20 can project an image beam onto screen 10 that is capable of forming an image on screen 12. The current development trend is to reduce the projection ratio of the projector 20 (the projection ratio is the ratio of the projection distance s and the screen width h, and the projection distance s is the distance between the projector 20 and the screen 10). The smaller the projection ratio, the smaller the projected image can be projected by the projector at a shorter projection distance. Projectors with a small projection ratio are prone to various aberrations such as distortion (English: Distortion), astigmatism (English: Astigmatism), field curvature (English: Field Curvature), and coma (English: Coma).
为了有效克服像差,相关技术的超短焦投影设备一般采用折射式、反射式以及混合式这三种方式中的一种来实现镜头设计。其中,混合式镜头一般包括折射透镜组和反射镜组。此方案综合了折射式和 反射式的特性,成为目前主流的设计方案。在不同平面上投影时,可以通过调节折射镜组和反射镜之间的距离来调节该投影设备的焦平面。In order to effectively overcome aberrations, the related art ultra-short-throw projection apparatus generally adopts one of three modes of refraction, reflection, and hybrid to realize lens design. Among them, the hybrid lens generally includes a refractive lens group and a mirror group. This solution combines the characteristics of refraction and reflection to become the current mainstream design. When projecting on different planes, the focal plane of the projection device can be adjusted by adjusting the distance between the mirror group and the mirror.
图2是本公开实施例提供的一种投影成像系统投影仪的结构示意图。该投影成像系统投影仪可以是应用于图1所示实施环境中的投影成像系统投影仪20。本公开实施例提供的投影成像系统投影仪20用于接收映像光束并投射到屏幕上成像。本公开实施例提供的投影成像系统投影仪20例如还可以是投影镜头,投影镜头应用在投影设备中。FIG. 2 is a schematic structural diagram of a projection imaging system projector according to an embodiment of the present disclosure. The projection imaging system projector can be a projection imaging system projector 20 that is used in the implementation environment shown in FIG. Projection Imaging System Projector 20 provided by an embodiment of the present disclosure is for receiving a image beam and projecting onto a screen for imaging. The projection imaging system projector 20 provided by the embodiment of the present disclosure may also be, for example, a projection lens, which is applied in a projection device.
投影仪包括光源,数字微镜元件和投影成像系统。所述数字微镜元件被配置为接受并调制光源出射的光以形成影像光束。该投影成像系统20包括沿着光的行进方向依次设置的折射镜组22和反射镜23。在一些实施例中,该投影成像系统20还包括光阀21,折射镜组22和反射镜23沿着光阀21的出光方向依次设置。在另一些实施例中,该光阀21不包括在投影成像系统20中,即该光阀21位于本公开实施例提供的投影成像系统20之外。投影成像系统20可以接收该光阀21射出的光束。在一些实施例中,光阀21和投影成像系统(投影镜头)位于同一投影设备内。光阀21可以是,光阀可以是数字微镜器件(Digital Micromirror Device,DMD)。The projector includes a light source, a digital micromirror component, and a projection imaging system. The digital micromirror element is configured to receive and modulate light exiting the light source to form an image beam. The projection imaging system 20 includes a refractive mirror group 22 and a mirror 23 that are sequentially disposed along the traveling direction of the light. In some embodiments, the projection imaging system 20 further includes a light valve 21, and the refractive mirror group 22 and the mirror 23 are sequentially disposed along the light exiting direction of the light valve 21. In other embodiments, the light valve 21 is not included in the projection imaging system 20, i.e., the light valve 21 is located outside of the projection imaging system 20 provided by embodiments of the present disclosure. The projection imaging system 20 can receive the light beam emitted by the light valve 21. In some embodiments, the light valve 21 and the projection imaging system (projection lens) are located within the same projection device. The light valve 21 may be that the light valve may be a Digital Micromirror Device (DMD).
上述折射镜组22包括沿光(即影像光束)的行进方向d依次排布的第一镜组221、第二镜组222和第三镜组223。第三镜组223也称为前群镜组,第二镜组222也称为中群镜组,第一镜组221也称为后群镜组。第三镜组223与反射镜23之间的距离L2是固定的。第一镜组221和第二镜组222均能够沿光的行进方向d移动或沿光的行进方向d的反方向移动,以调节投影成像系统的焦平面。在一些实施例中,第三镜组223和反射镜23的位置固定,第一镜组221和第二镜组222均能够沿光的行进方向d或其反方向移动。上述第一镜组221与第二镜组222的屈光度为正,第三镜组223的屈光度为负。The above-described refractor group 22 includes a first mirror group 221, a second mirror group 222, and a third mirror group 223 which are sequentially arranged in the traveling direction d of light (i.e., image beam). The third mirror group 223 is also referred to as a front group mirror group, the second mirror group 222 is also referred to as a middle group mirror group, and the first mirror group 221 is also referred to as a rear group mirror group. The distance L2 between the third mirror group 223 and the mirror 23 is fixed. Both the first mirror group 221 and the second mirror group 222 are movable in the traveling direction d of the light or in the opposite direction of the traveling direction d of the light to adjust the focal plane of the projection imaging system. In some embodiments, the positions of the third mirror group 223 and the mirror 23 are fixed, and both the first mirror group 221 and the second mirror group 222 are movable in the traveling direction d of the light or in the opposite direction. The diopter of the first mirror group 221 and the second mirror group 222 is positive, and the refracting power of the third mirror group 223 is negative.
第三镜组223与反射镜23之间的距离L2即为折射镜组22与反 射镜23之间的距离是固定的。可以移动第一镜组221和第二镜组222以调节投影成像系统的焦平面,同时第三镜组223与反射镜23之间的距离保持不变,从而避免了产生较大的畸变。The distance L2 between the third mirror group 223 and the mirror 23 is such that the distance between the mirror group 22 and the mirror 23 is fixed. The first mirror group 221 and the second mirror group 222 can be moved to adjust the focal plane of the projection imaging system while the distance between the third mirror group 223 and the mirror 23 remains unchanged, thereby avoiding large distortion.
综上所述,本公开实施例提供的投影仪,通过将折射镜组拆分为光的行进方向依次设置的第一镜组、第二镜组和第三镜组,并使其中的第一镜组和第二镜组能够沿光的行进方向或该方向的反方向移动,即可以在不改变折射镜组和反射镜之间的距离的情况下调节投影仪的焦平面。解决了相关技术中调节折射镜组和反射镜之间的距离所导致的画面的畸变可能较大,使得投影仪的成像质量较低的问题,达到了投影仪的成像质量较高的效果。In summary, the projector provided by the embodiment of the present disclosure divides the refractor group into a first mirror group, a second mirror group, and a third mirror group, which are sequentially disposed in the traveling direction of the light, and makes the first The mirror group and the second mirror group are movable in the traveling direction of the light or in the opposite direction of the direction, that is, the focal plane of the projector can be adjusted without changing the distance between the mirror group and the mirror. The problem that the distortion of the picture caused by adjusting the distance between the refractor group and the mirror in the related art may be large, so that the image quality of the projector is low, and the imaging quality of the projector is high.
在本公开的一些实施例中,折射镜组22和反射镜23满足第一公式,第一公式为:0.9<L1/L2<1.2。L1为折射镜组22的长度,L2为折射镜组22和反射镜23之间的间距。L2为预设范围内中的一个值,该预设范围例如可以为:69mm(毫米)至91mm。例如,L2可以为73mm或87mm。L2可以为69mm或91mm。L2在投影仪出厂后为一个不可变的数值,如此能够在各种投影尺寸下稳定的控制畸变。上述距离或长度均为沿d方向上的长度值。In some embodiments of the present disclosure, the refractive mirror group 22 and the mirror 23 satisfy the first formula, and the first formula is: 0.9 < L1/L2 < 1.2. L1 is the length of the refractive mirror group 22, and L2 is the spacing between the refractive mirror group 22 and the mirror 23. L2 is a value within a preset range, which may be, for example, 69 mm (mm) to 91 mm. For example, L2 can be 73mm or 87mm. L2 can be 69mm or 91mm. The L2 is an immutable value after the projector is shipped, so that it can stably control distortion at various projection sizes. The above distance or length is a length value in the d direction.
在本公开的一些实施例中,折射镜组22的第一镜组21、第二镜组22和第三镜组23满足第二公式,第二公式为:In some embodiments of the present disclosure, the first mirror group 21, the second mirror group 22, and the third mirror group 23 of the refracting mirror group 22 satisfy the second formula, and the second formula is:
其中,F为折射镜组22的等效焦距,FB为第一镜组221的等效焦距,FM为第二镜组222的等效焦距,FF为第三镜组223的等效焦距,FC为反射镜23的等效焦距。Where F is the equivalent focal length of the refractor group 22, FB is the equivalent focal length of the first mirror group 221, FM is the equivalent focal length of the second mirror group 222, and FF is the equivalent focal length of the third mirror group 223, FC It is the equivalent focal length of the mirror 23.
在本公开的一些实施例中,所述反射镜23为凹面非球面反射镜或者自由曲面反射镜,其内凹的曲面被配置为接收第三镜组出射的光线。In some embodiments of the present disclosure, the mirror 23 is a concave aspheric mirror or a free-form mirror, the concave curved surface of which is configured to receive the light emitted by the third mirror.
光阀21例如是数字微镜元件(英文:Digital Micromirror Device;简称:DMD),DMD可以是2K分辨率或4K分辨率。另外,光阀21包括反射镜阵列和控制电路,当光阀21受到光照时,控制电路控制反射镜阵列反射光源系统发射出的光束,产生影像光束,并出射向投影成像系统。其中光源是指投影设备中为光阀21提供光束的光学元件,有关光阀21如何具体产生影像光束为相关技术,在此不再赘述。The light valve 21 is, for example, a digital micromirror device (English: Digital Micromirror Device; abbreviation: DMD), and the DMD may be 2K resolution or 4K resolution. In addition, the light valve 21 includes a mirror array and a control circuit. When the light valve 21 is illuminated, the control circuit controls the mirror array to reflect the light beam emitted by the light source system, generates an image beam, and exits the projection imaging system. The light source refers to an optical component that provides a light beam for the light valve 21 in the projection device. The related art of how the light valve 21 specifically generates an image beam is not described herein.
本公开实施例提供的投影仪至少可以包括两种结构,下面以这两种结构为例分别进行说明。The projector provided by the embodiment of the present disclosure may include at least two structures, and the two structures are respectively described below as an example.
如图3所示,为本公开的一些实施例提供的投影仪的第一种结构,该结构能够实现高分辨率(如4K)的投影成像。该投影仪20包括折射镜组22和反射镜23。该投影仪20还包括振动镜片24。振动镜片24在光路中位于所述折射镜组的上游,例如如图3所示,振动镜片24可设置在光阀21和折射镜组22之间的光路上。As shown in FIG. 3, a first configuration of a projector provided by some embodiments of the present disclosure is capable of achieving high resolution (e.g., 4K) projection imaging. The projector 20 includes a refractive mirror group 22 and a mirror 23. The projector 20 also includes a vibrating lens 24. The vibrating lens 24 is located upstream of the refractor group in the optical path. For example, as shown in FIG. 3, the vibrating lens 24 may be disposed on the optical path between the light valve 21 and the refractor group 22.
振动镜片24配置为通过自身振动使得经过振动镜片的相邻两帧投影图像对应的影像光束的光路不完全重叠,并将相邻两帧投影图像对应的影像光束依次射向折射镜组,投影图像为影像光束经过投影成像系统后在投影屏幕上呈现的图像。The vibrating lens 24 is configured such that the optical path of the image beam corresponding to the adjacent two frames of the vibrating lens does not completely overlap by the self-vibration, and the image beams corresponding to the adjacent two frames of the projected image are sequentially directed to the refractor group, and the projected image is projected. An image that is rendered on a projection screen after the image beam passes through the projection imaging system.
在本公开的一些实施例中,振动镜片24可以为平板玻璃或其他透明基板。振动镜片24能够振动,使得在不同振动状态下出射的光线存在不同的偏移。振动镜片24振动使得经过振动镜片24的相邻两帧投影图像对应的影像光束的光路不完全重叠,使得相邻像素帧中的同一相对位置的像素成像的位置不重叠并存在一定的偏移,进而提高成像的分辨率,而且由于振动镜片24的振动使得相邻两帧投影图像同一相对位置的像素对应的影像光束略微错开,进而使得像素之间的过度更加平滑,从而提高成像的细腻感,进而提高成像质量,实现高分辨率的画质。In some embodiments of the present disclosure, the vibrating lens 24 can be a flat glass or other transparent substrate. The vibrating lens 24 is capable of vibrating such that light rays emerging in different vibration states have different offsets. The vibrating lens 24 vibrates such that the optical paths of the image beams corresponding to the adjacent two-frame projected images of the vibrating lens 24 do not completely overlap, so that the positions of the pixels of the same relative position in the adjacent pixel frames are not overlapped and have a certain offset. In addition, the resolution of the imaging is improved, and the image beam corresponding to the pixels of the same relative position of the adjacent two frames of the projected image is slightly staggered due to the vibration of the vibrating lens 24, thereby making the excessive transition between the pixels smoother, thereby improving the delicate feeling of imaging. In turn, the image quality is improved and high-resolution image quality is achieved.
在一些实施例中,所述投影成像系统投影仪还可包括全反射棱 镜25。所述全反射棱镜25在光路中位于所述振动镜片24的上游,例如全反射棱镜25位于光阀21和振动镜片24之间的光路上。该全反射棱镜25可包括两个胶合的全反射棱镜,分别为第一全反射棱镜和第二全反射棱镜(图3中未示出)。从光阀21射来的光束,首先射向第一全反射棱镜,当光束射向第一全反射棱镜时,光束发生全反射,并将发生全反射后的光束射向光阀。当发生全反射后的光束射向光阀21时,光阀21反射光束产生影像光束,然后将产生的影像光束从光阀21射向全反射棱镜25。当影像光束从光阀21射向全反射棱镜25时,影像光束不发生全反射,而是直接将影像光束射向振动镜片24。由于第一全反射棱镜使得射向其自身的光束发生全反射,因此使用全反射棱镜25就可以将光束反射到光阀21上,从而不需要通过多个普通反射镜进行多次反射,进而减少了普通反射镜的使用数量,大大缩小了投影成像系统投影仪的体积。另外,全反射棱镜25使得通过其中的光束变为平行于光轴z均匀光束,因此,满足了远心光路的需求,由于使得光阀21产生的影像光束变得均匀,从而也提高投影图像的质量。In some embodiments, the projection imaging system projector may further include a total reflection prism 25. The total reflection prism 25 is located upstream of the vibrating mirror 24 in the optical path, for example, the total reflection prism 25 is located on the optical path between the light valve 21 and the vibrating lens 24. The total reflection prism 25 may include two glued total reflection prisms, respectively a first total reflection prism and a second total reflection prism (not shown in FIG. 3). The light beam emitted from the light valve 21 is first directed toward the first total reflection prism, and when the light beam is directed toward the first total reflection prism, the light beam is totally reflected, and the totally reflected light beam is directed to the light valve. When the totally reflected light beam is directed to the light valve 21, the light valve 21 reflects the light beam to generate an image light beam, and then the generated image light beam is directed from the light valve 21 to the total reflection prism 25. When the image beam is directed from the light valve 21 to the total reflection prism 25, the image beam does not undergo total reflection, but directly directs the image beam toward the vibrating lens 24. Since the first total reflection prism causes total reflection of the light beam directed to itself, the total reflection prism 25 can be used to reflect the light beam onto the light valve 21, thereby eliminating the need for multiple reflections by a plurality of ordinary mirrors, thereby reducing The number of ordinary mirrors used greatly reduces the size of the projection imaging system projector. In addition, the total reflection prism 25 causes the light beam passing therethrough to become a uniform light beam parallel to the optical axis z, thereby satisfying the demand for the telecentric optical path, since the image beam generated by the light valve 21 is made uniform, thereby also improving the projected image. quality.
第一镜组221例如可包括11个透镜,第二镜组222可包括3个透镜,第三镜组223可包括1个透镜。第一镜组221可以用于校正除畸变外的像差,第二镜组222可以用于校正色差,并配合第三镜组223校正畸变,第三镜组223和反射镜23可以用于校正畸变。The first mirror group 221 may include, for example, 11 lenses, the second mirror group 222 may include 3 lenses, and the third mirror group 223 may include 1 lens. The first mirror group 221 can be used to correct aberrations other than distortion, the second mirror group 222 can be used to correct chromatic aberration, and the third mirror group 223 can be used to correct distortion, and the third mirror group 223 and the mirror 23 can be used for correction. distortion.
在一些实施例中,第一镜组221可包括沿光的行进方向d依次设置的第一透镜a1、第二透镜a2、第三透镜a3、第四透镜a4、第五透镜a5、第六透镜a6、第七透镜a7、第八透镜a8、第九透镜a9、第十一透镜a11,其中,第四、八、十一透镜的屈光度为负,第一、二、三、五、六、七、九透镜的屈光度为正。在一些实施例中,第二透镜a2、第六透镜a6和第七透镜a7为非球面透镜,第一镜组221中除第二透镜a2、第六透镜a6和第七透镜a7外的透镜均为球面透镜。In some embodiments, the first mirror group 221 may include a first lens a1, a second lens a2, a third lens a3, a fourth lens a4, a fifth lens a5, and a sixth lens which are sequentially disposed along the traveling direction d of the light. A6, a seventh lens a7, an eighth lens a8, a ninth lens a9, an eleventh lens a11, wherein the diopter of the fourth, eighth, and eleventh lenses is negative, first, second, third, fifth, sixth, seventh The diopter of the nine lens is positive. In some embodiments, the second lens a2, the sixth lens a6, and the seventh lens a7 are aspherical lenses, and the lenses of the first lens group 221 other than the second lens a2, the sixth lens a6, and the seventh lens a7 are It is a spherical lens.
第六透镜a6、第七透镜a7用于提升大视场的分辨率。第二透镜a2用于改善慧差。第二透镜a2与第九透镜a9一起配合可增大镜 头的后工作距离。在本公开的一些实施例中,第一镜组还可包括设置在第九透镜a9和第十一透镜a11之间的第十透镜a10,第十透镜a10用于消温飘。第十透镜a10的屈光度为正。The sixth lens a6 and the seventh lens a7 are used to enhance the resolution of the large field of view. The second lens a2 is used to improve the coma. The second lens a2 cooperates with the ninth lens a9 to increase the rear working distance of the lens. In some embodiments of the present disclosure, the first mirror group may further include a tenth lens a10 disposed between the ninth lens a9 and the eleventh lens a11, and the tenth lens a10 is used for temperature relaxation. The diopter of the tenth lens a10 is positive.
在一些实施例中,第二镜组222可包括沿光的行进方向d依次设置的第十二透镜a12、第十三透镜a13和第十四透镜a14,所述第十二透镜a12与所述第十三透镜a13屈光度为正,所述第十四透镜a14屈光度为负。第二镜组222中的透镜可均为球面透镜。In some embodiments, the second mirror group 222 may include a twelfth lens a12, a thirteenth lens a13, and a fourteenth lens a14 that are sequentially disposed along the traveling direction d of the light, the twelfth lens a12 and the The thirteenth lens a13 has a positive dioptric power, and the fourteenth lens a14 has a negative dioptric power. The lenses in the second lens group 222 may all be spherical lenses.
在一些实施例中,第三镜组223可包括第十五透镜a15,第十五透镜a15为非球面透镜。所述第十五透镜a15为屈光度为负。第十五透镜a15用于改善像散和畸变。In some embodiments, the third lens group 223 may include a fifteenth lens a15, and the fifteenth lens a15 is an aspherical lens. The fifteenth lens a15 is negative in diopter. The fifteenth lens a15 is used to improve astigmatism and distortion.
上述第一镜组221、第二镜组222、第三镜组223和反射镜23位于同一主光轴z上。The first mirror group 221, the second mirror group 222, the third mirror group 223, and the mirror 23 are located on the same main optical axis z.
在本公开的一些实施例中,上述第二透镜a2、第六透镜a6、第七透镜a7、第十五透镜a15为轴对称的透镜。In some embodiments of the present disclosure, the second lens a2, the sixth lens a6, the seventh lens a7, and the fifteenth lens a15 are axially symmetric lenses.
在本公开的一些实施例中,上述第一透镜a1、第五透镜a5、第六透镜a6和第十透镜a10为凹凸透镜,第五透镜a5和第六透镜a6的凸出部分朝向光的行进方向d的反方向,第十透镜a10的凸出部分朝向光的行进方向d。上述第二透镜a2、第三透镜a3、第七透镜a7和第九透镜a9为双凸透镜。上述第四透镜a4、第八透镜a8和第十一透镜a11为双凹透镜。In some embodiments of the present disclosure, the first lens a1, the fifth lens a5, the sixth lens a6, and the tenth lens a10 are the meniscus lenses, and the convex portions of the fifth lens a5 and the sixth lens a6 are oriented toward the light. In the opposite direction of the direction d, the convex portion of the tenth lens a10 faces the traveling direction d of the light. The second lens a2, the third lens a3, the seventh lens a7, and the ninth lens a9 are lenticular lenses. The fourth lens a4, the eighth lens a8, and the eleventh lens a11 are biconcave lenses.
在本发明的一个实施方式中,第1透镜a1与第3透镜a3之间还设置有屈光度为正的第2透镜a2。第2透镜a2为非球面透镜,优选为轴对称的非球面透镜。第2透镜a2用于改善慧差,第2透镜a2与第9透镜a9一起配合可增大镜头的后工作距离。在本实施例中,该投影成像系统的后焦距BFL(Back focal length)能达到的取值为20mm至34mm之间。In one embodiment of the present invention, the second lens a2 having a positive diopter is further provided between the first lens a1 and the third lens a3. The second lens a2 is an aspherical lens, and is preferably an axisymmetric aspherical lens. The second lens a2 is for improving the coma aberration, and the second lens a2 is engaged with the ninth lens a9 to increase the rear working distance of the lens. In this embodiment, the back focal length (BFL) of the projection imaging system can reach a value between 20 mm and 34 mm.
在本公开的一些实施例中,第四透镜a4的一侧与第三透镜a3结合,第四透镜a4的另一侧与第五透镜a5结合,以减小色差。第三透镜a3、第四透镜a4和第五透镜a5可以通过胶合的方式结合在一起。 其中结合可以是相互贴合。In some embodiments of the present disclosure, one side of the fourth lens a4 is combined with the third lens a3, and the other side of the fourth lens a4 is combined with the fifth lens a5 to reduce chromatic aberration. The third lens a3, the fourth lens a4, and the fifth lens a5 may be bonded together by gluing. The combination may be a mutual fit.
第四透镜a4的阿贝数在22和17之间,第四透镜a4的折射率大于1.8。第三透镜a3、第五透镜a5的折射率小于第四透镜a4的折射率,第三透镜a4、第五透镜a5的阿贝数大于第四透镜a4的阿贝数。阿贝数(英文:Abbe)是用来衡量介质的光线色散程度的物理量。材料的折射率越大,色散越强,阿贝数越低。The Abbe number of the fourth lens a4 is between 22 and 17, and the refractive index of the fourth lens a4 is greater than 1.8. The refractive indices of the third lens a3 and the fifth lens a5 are smaller than the refractive index of the fourth lens a4, and the Abbe numbers of the third lens a4 and the fifth lens a5 are larger than the Abbe number of the fourth lens a4. Abbe number (English: Abbe) is a physical quantity used to measure the degree of light dispersion of a medium. The greater the refractive index of the material, the stronger the dispersion and the lower the Abbe number.
在本公开的一些实施例中,第十透镜a10和第十一透镜a11互相结合,以减小轴向色差。例如,第十透镜a10和第十一透镜a11可以通过胶合的方式互相结合。第十透镜的折射率大于第十一透镜,第十透镜的阿贝数小于第十一透镜的阿贝数。In some embodiments of the present disclosure, the tenth lens a10 and the eleventh lens a11 are combined with each other to reduce axial chromatic aberration. For example, the tenth lens a10 and the eleventh lens a11 may be bonded to each other by gluing. The refractive index of the tenth lens is larger than that of the eleventh lens, and the Abbe number of the tenth lens is smaller than the Abbe number of the eleventh lens.
在本公开的一些实施例中,第十三透镜a13和第十四透镜a14互相结合,以减小色差。第十三透镜的折射率小于第十四透镜的折射率,第十三透镜的阿贝数大于第十四透镜的阿贝数。第十三透镜a13和第十四透镜a14可以通过胶合的方式互相结合。In some embodiments of the present disclosure, the thirteenth lens a13 and the fourteenth lens a14 are combined with each other to reduce chromatic aberration. The refractive index of the thirteenth lens is smaller than the refractive index of the fourteenth lens, and the Abbe number of the thirteenth lens is larger than the Abbe number of the fourteenth lens. The thirteenth lens a13 and the fourteenth lens a14 may be bonded to each other by gluing.
在图3所示的投影仪中,第三透镜a3、第四透镜a4和第五透镜a5构成一组互相结合的透镜,第十透镜a10和第十一透镜a11构成一组互相结合的透镜,第十三透镜a13和第十四透镜a14又构成一组互相结合的透镜,这三组互相结合的透镜可以用于改善投影仪的不同光谱的球差,并对投影仪的轴向色差、垂轴色差进行矫正。In the projector shown in FIG. 3, the third lens a3, the fourth lens a4, and the fifth lens a5 constitute a set of mutually coupled lenses, and the tenth lens a10 and the eleventh lens a11 constitute a set of mutually coupled lenses. The thirteenth lens a13 and the fourteenth lens a14 form a set of mutually combined lenses, and the three sets of mutually combined lenses can be used to improve the spherical aberration of different spectra of the projector, and the axial chromatic aberration of the projector and the vertical The axial color difference is corrected.
图3所示的投影仪中,第一透镜、第二透镜、第三透镜、第五透镜、第六透镜、第七透镜、第九透镜和第十透镜的屈光度为正,第四透镜、第八透镜和第十一透镜的屈光度为负。第一镜组221的整体屈光度为正。In the projector shown in FIG. 3, the diopter of the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, the ninth lens, and the tenth lens is positive, the fourth lens, the first lens The diopter of the eight lens and the eleventh lens is negative. The overall diopter of the first mirror group 221 is positive.
第二镜组22中的第十二透镜的屈光度为正、第十三透镜的屈光度为正、第十四透镜的屈光度为负。第二镜组222的整体屈光度为正。第三镜组中的第十五透镜的屈光度为负。The dioptence of the twelfth lens in the second mirror group 22 is positive, the dioptric power of the thirteenth lens is positive, and the dioptric power of the fourteenth lens is negative. The overall diopter of the second mirror group 222 is positive. The fifteenth lens in the third lens group has a negative diopter.
光阀21到第一透镜a1的距离为后焦距(英文:Back Focus Length;简称:BFL),BFL满足0.29<BFL/L2<0.37。在本公开的一些实施例中,第七透镜a7的入光面还可设置有光阑。The distance from the light valve 21 to the first lens a1 is the back focus (English: Back Focus Length; BFL for short), and the BFL satisfies 0.29 < BFL/L2 < 0.37. In some embodiments of the present disclosure, the light incident surface of the seventh lens a7 may also be provided with an aperture.
图3所示结构为二次成像架构,光阀21的影像光束通过折射镜组后,在反射镜和折射镜组之间进行第一次成像,第一次成像经反射镜反射后,在屏幕上形成二次无畸变的图像。本公开实施例提供的投影仪整体紧凑,通过光阑设置、非球面透镜、反射镜对大视场像差的矫正,提高了投影仪的解像能力,从而实现了高分辨率的成像质量。The structure shown in FIG. 3 is a secondary imaging structure. After the image beam of the light valve 21 passes through the refractor group, the first imaging is performed between the mirror and the refractor group, and the first image is reflected by the mirror and then on the screen. A second undistorted image is formed on the image. The projector provided by the embodiment of the present disclosure is compact overall, and the correction of the large field of view aberration by the aperture setting, the aspherical lens and the mirror improves the resolution of the projector, thereby realizing high-resolution imaging quality.
在图3所示的投影仪制造完成后,第三镜组223和反射镜23之间的距离是固定的,第一镜组221与第二镜组222之间的距离可以进行调整,第二镜组222和第三镜组223之间的距离也可以进行调整。After the projector shown in FIG. 3 is manufactured, the distance between the third mirror group 223 and the mirror 23 is fixed, and the distance between the first mirror group 221 and the second mirror group 222 can be adjusted. The distance between the mirror group 222 and the third mirror group 223 can also be adjusted.
在本公开的一些实施例中,图3所示的投影仪的有效焦距(英文:Effective Focal Length)为-2.09毫米(mm),偏移量(英文:offset)为140%至148%,解析能力可以达到93线对/毫米(lp/mm),可以投射出画面尺寸为80至120英寸,投射比0.20至0.22。In some embodiments of the present disclosure, the effective focal length (English: Effective Focal Length) of the projector shown in FIG. 3 is -2.09 mm (mm), and the offset (English: offset) is 140% to 148%. The ability to achieve 93 line pairs / mm (lp / mm), can project a screen size of 80 to 120 inches, projection ratio of 0.20 to 0.22.
在本公开的一些实施例中,投影仪符合下列条件:有效焦距(Effective Focal Length)=-2.1mm,偏移量(offset)=140%~148%,解析能力可以达到93lp/mm,可以投射出画面尺寸为65~80英寸,投射比(投影距离/画面长度方向)为0.20~0.22。In some embodiments of the present disclosure, the projector meets the following conditions: Effective Focal Length = -2.1 mm, Offset = 140% - 148%, resolution of 93 lp / mm, can be projected The screen size is 65 to 80 inches, and the projection ratio (projection distance/screen length direction) is 0.20 to 0.22.
如图4所示,为本公开的一些实施例提供的投影仪的第二种结构,该结构能够实现超短焦距的投影成像。该投影仪20包括折射镜组22和反射镜23。第一镜组221包括10个透镜,第二镜组包括3个透镜,第三镜组包括1个透镜。As shown in FIG. 4, a second structure of a projector provided by some embodiments of the present disclosure is capable of achieving projection imaging of an ultra-short focal length. The projector 20 includes a refractive mirror group 22 and a mirror 23. The first mirror group 221 includes 10 lenses, the second mirror group includes 3 lenses, and the third mirror group includes 1 lens.
第一镜组221包括沿光的行进方向d依次设置的第二十一透镜a21、第二十二透镜a22、第二十三透镜a23、第二十四透镜a24、第二十五透镜a25、第二十六透镜a26、第二十七透镜a27、第二十八透镜a28、第二十九透镜a29、第三十透镜a30。第二十六透镜a26和第二十七透镜a27为非球面透镜,第一镜组221中除第二十六透镜a26和第二十七透镜a27外的透镜为球面透镜。相较于图3所示的投影仪,图4所示的投影仪中的非球面镜的数量较少,且镜片的数量也较少,因而降低了投影仪的成本以及长度。第二十四透镜a24、第二十八透 镜a28和第二十九透镜a29的屈光度为负,第二十一透镜a21、第二十二透镜a22、第二十三透镜a23、第二十五透镜a25、第二十六透镜a26、第二十七透镜a27和第三十透镜a30的屈光度为正。The first mirror group 221 includes a twenty-first lens a21, a twenty-second lens a22, a twenty-third lens a23, a twenty-fourth lens a24, a twenty-fifth lens a25, which are sequentially disposed along the traveling direction d of the light, The twenty-sixth lens a26, the twenty-seventh lens a27, the twenty-eighth lens a28, the twenty-ninth lens a29, and the thirtieth lens a30. The twenty-sixth lens a26 and the twenty-seventh lens a27 are aspherical lenses, and the lenses of the first mirror group 221 other than the twenty-sixth lens a26 and the twenty-seventh lens a27 are spherical lenses. Compared to the projector shown in FIG. 3, the number of aspherical mirrors in the projector shown in FIG. 4 is small, and the number of lenses is also small, thereby reducing the cost and length of the projector. The refracting power of the twenty-fourth lens a24, the twenty-eighth lens a28, and the twenty-ninth lens a29 is negative, the twenty-first lens a21, the twenty-second lens a22, the twenty-third lens a23, the twenty-fifth The diopter of the lens a25, the twenty-sixth lens a26, the twenty-seventh lens a27, and the thirtieth lens a30 is positive.
在本公开的一些实施例中,第二十三透镜a23、第二十四透镜a24和第二十五透镜a25依次胶合在一起,第二十九透镜a29与第三十透镜a30胶合在一起。In some embodiments of the present disclosure, the twenty-third lens a23, the twenty-fourth lens a24, and the twenty-fifth lens a25 are sequentially glued together, and the twenty-ninth lens a29 and the thirty-th lens a30 are glued together.
在本公开的一些实施例中,第二十五透镜a25、第二十六透镜a26为凸出部分朝向光的行进方向d的反方向的凸凹透镜。第二十一透镜a21、第二十二透镜a22、第二十三透镜a23、第二十七透镜a27和第三十透镜a30为双凸透镜。第二十四透镜a24、第二十八透镜a28和第二十九透镜a29为双凹透镜。In some embodiments of the present disclosure, the twenty-fifth lens a25 and the twenty-sixth lens a26 are convex-concave lenses in which the convex portions are opposite to the traveling direction d of the light. The twenty-first lens a21, the twenty-second lens a22, the twenty-third lens a23, the twenty-seventh lens a27, and the thirtieth lens a30 are lenticular lenses. The twenty-fourth lens a24, the twenty-eighth lens a28, and the twenty-ninth lens a29 are biconcave lenses.
第二镜组222包括:沿光的行进方向依次设置的第十二透镜a12、第十三透镜a13、第十四透镜a14;第十二透镜a12与第十三透镜a13屈光度为正,第十四透镜a14屈光度为负。The second mirror group 222 includes: a twelfth lens a12, a thirteenth lens a13, and a fourteenth lens a14 which are sequentially disposed in the traveling direction of the light; the twelfth lens a12 and the thirteenth lens a13 have a positive diopter, and the tenth The four lens a14 diopter is negative.
第三镜组a13包括屈光度为负的第十五透镜a15,第十五透镜a15为非球面透镜。The third mirror group a13 includes a fifteenth lens a15 having a negative diopter, and the fifteenth lens a15 is an aspherical lens.
在至少一个实施例,图4所示的投影仪的有效焦距可以为-2.1mm,偏移量可以为140%至148%,解析能力可以达到93lp/mm,可以投射出画面尺寸为65至80英寸,投射比为0.20至0.22。In at least one embodiment, the projector shown in FIG. 4 can have an effective focal length of -2.1 mm, an offset of 140% to 148%, a resolution of 93 lp/mm, and a projected screen size of 65 to 80. Inches, the throw ratio is 0.20 to 0.22.
如图6所示,在本公开的一些实施例中,投影仪20包括沿光轴101依次设置的光阀102、全反射棱镜103、第一镜组120、第二镜组130、第三镜组140和反射镜150。其中,第三镜组140包括一个非球面塑胶透镜,该透镜的出光面的形状是反曲的,适用于塑胶射出成型。图4中第十五透镜a15的形状适用于玻璃模制成型。图6中全反射棱镜103与第二镜组120的第一个透镜距离较近,第二镜组120的沿光的行进方向的第一个透镜是双凸透镜,第二个透镜是凸凹透镜,且第二个透镜为球面透镜。光阀102、全反射棱镜103、第一镜组120的其余透镜和第二镜组130与图4大致类似,不再详细叙述。As shown in FIG. 6, in some embodiments of the present disclosure, the projector 20 includes a light valve 102, a total reflection prism 103, a first mirror group 120, a second mirror group 130, and a third mirror which are sequentially disposed along the optical axis 101. Group 140 and mirror 150. The third mirror group 140 includes an aspherical plastic lens, and the shape of the light-emitting surface of the lens is recurved, which is suitable for plastic injection molding. The shape of the fifteenth lens a15 in Fig. 4 is suitable for glass molding. In FIG. 6, the total reflection prism 103 is closer to the first lens of the second mirror group 120, the first lens of the second lens group 120 in the traveling direction of the light is a lenticular lens, and the second lens is a convex-concave lens. And the second lens is a spherical lens. The light valve 102, the total reflection prism 103, the remaining lenses of the first mirror group 120, and the second mirror group 130 are substantially similar to those of FIG. 4 and will not be described in detail.
本公开一些实施例中所涉及不同透镜、镜组之间距离为在光轴 z上的距离。The distance between different lenses, groups of mirrors involved in some embodiments of the present disclosure is the distance on the optical axis z.
综上所述,本公开实施例提供的投影仪,通过将折射镜组拆分为沿光的行进方向依次设置的第一镜组、第二镜组和第三镜组,并使其中的第一镜组和第二镜组能够光的行进方向或该方向的反方向移动,以调节投影仪的焦平面,即可以在不改变折射镜组和反射镜之间的距离的情况下调节投影仪的焦平面。解决了相关技术中调节折射镜组和反射镜之间的距离所导致的画面的畸变可能较大,使得投影仪的成像质量较低的问题。达到了投影仪的成像质量较高的效果。In summary, the projector provided by the embodiment of the present disclosure splits the refractor group into a first mirror group, a second mirror group, and a third mirror group which are sequentially disposed along the traveling direction of the light, and the first A mirror group and a second mirror group are capable of moving the direction of travel of the light or the opposite direction of the direction to adjust the focal plane of the projector, that is, the projector can be adjusted without changing the distance between the mirror group and the mirror Focal plane. The problem that the distortion of the picture caused by adjusting the distance between the refractor group and the mirror in the related art may be large, so that the imaging quality of the projector is low is solved. The effect of high image quality of the projector is achieved.
本公开实施例提供的投影仪中,第一镜组和第二镜组能够通过各种移动结构沿光的行进方向或该方向的反方向移动,示例性的,如图6所示,其为本公开实施例提供的一种投影仪的结构示意图。In the projector provided by the embodiment of the present disclosure, the first mirror group and the second mirror group can be moved in the traveling direction of the light or the opposite direction of the direction through various moving structures, as shown in FIG. 6 , which is A schematic structural diagram of a projector provided by an embodiment of the present disclosure.
投影仪还包括第一镜筒A1、主镜筒A2、第二镜筒A3和反射镜筒A4,第一镜组设置在第一镜筒A1中、第三镜组设置在主镜筒A2中、第二镜组设置在第三镜筒A3中(为了便于说明,图5中仅示出了各个镜组中的部分透镜各个镜组中透镜的结构可以参考上述实施例),反射镜设置在反射镜筒A4中,主镜筒A2相对反射镜筒A4的位置不变,以保证第三镜组与反射镜23之间的位置相对固定。第一镜筒A1和主镜筒A2通过调节环C1转动连接,调节环C1包括第一滚轴(滚轴即为Roller)C11和第二滚轴C12,第一滚轴C11与第一镜筒A1转动连接,第二滚轴C12与主镜筒A2转动连接,调节环C1上设置有与第一滚轴C11配合的沿第一镜筒A1周向的直槽(图5中未标出),调节环C1上还设置有与第二滚轴C12配合的沿第一镜筒A1周向的斜槽(图5中未标出)。The projector further includes a first barrel A1, a main barrel A2, a second barrel A3, and a mirror barrel A4, the first mirror group being disposed in the first barrel A1 and the third mirror group being disposed in the main barrel A2 The second lens group is disposed in the third lens barrel A3 (for convenience of explanation, only the partial lens in each lens group is shown in FIG. 5, the structure of the lens in each lens group may refer to the above embodiment), and the mirror is disposed at In the mirror barrel A4, the position of the main barrel A2 with respect to the mirror barrel A4 is constant to ensure that the position between the third mirror group and the mirror 23 is relatively fixed. The first barrel A1 and the main barrel A2 are rotatably connected by an adjusting ring C1. The adjusting ring C1 includes a first roller (Roller is a roller) C11 and a second roller C12, and the first roller C11 and the first barrel A1 is rotatably connected, the second roller C12 is rotatably connected to the main barrel A2, and the adjusting ring C1 is provided with a straight groove along the circumferential direction of the first barrel A1 which is engaged with the first roller C11 (not shown in FIG. 5). The adjusting ring C1 is further provided with a chute (not shown in FIG. 5) along the circumferential direction of the first barrel A1 in cooperation with the second roller C12.
由于第二滚轴C12与主镜筒A2连接,并且第二滚轴C12的运动轨迹槽为直槽。所以调节环C1转动时相对于主镜筒A2在光的行进方向d上相对静止。第一滚轴C11与第一镜筒A1连接,并且第一滚轴C11的运动轨迹槽为斜槽,所以调节环C1转动时,会带动第一滚轴C11相对于主镜筒A2沿光的行进方向d(或该方向d的反方向)运动, 进而使得第一镜筒A1相对于主镜筒A2沿光的行进方向d(或光的行进方向d的反方向)运动。Since the second roller C12 is coupled to the main barrel A2, and the movement track groove of the second roller C12 is a straight groove. Therefore, the adjustment ring C1 is relatively stationary with respect to the main barrel A2 in the traveling direction d of the light when it is rotated. The first roller C11 is connected to the first barrel A1, and the movement track groove of the first roller C11 is a chute. Therefore, when the adjustment ring C1 rotates, the first roller C11 is driven along the main barrel A2 along the light. The traveling direction d (or the opposite direction of the direction d) moves, thereby causing the first barrel A1 to move relative to the main barrel A2 in the traveling direction d of the light (or the opposite direction of the traveling direction d of the light).
如图7所示,其为图6所示投影仪中调节环C1处的俯视图,可以看出,调节环C1上设置有直槽g1和斜槽g2。As shown in FIG. 7, which is a top view of the adjustment ring C1 in the projector shown in FIG. 6, it can be seen that the adjustment ring C1 is provided with a straight groove g1 and a chute g2.
此外,主镜筒A2和第二镜筒A3之间的连接方式与,主镜筒A2和第一镜筒A1之间的连接方式类似,在此不再赘述。In addition, the connection between the main barrel A2 and the second barrel A3 is similar to that of the main barrel A2 and the first barrel A1, and will not be described herein.
根据本公开的第二方面,本公开实施例还提供一种激光投影装置,包括光源、光阀以及上述实施例提供的投影成像系统;其中,光阀将光源入射的激光光束调制后出射至投影成像系统。所述光阀例如为数字微镜元件。According to a second aspect of the present disclosure, an embodiment of the present disclosure further provides a laser projection apparatus including a light source, a light valve, and the projection imaging system provided by the above embodiment; wherein the light valve modulates the laser beam incident from the light source to be projected to the projection Imaging system. The light valve is for example a digital micromirror element.
本公开的激光投影装置可以在不改变折射镜组和反射镜之间的距离的情况下调节投影成像系统的焦平面,避免由于调节折射镜组和反射镜之间的距离所导致的画面畸变,提高了投影成像系统的成像质量。The laser projection apparatus of the present disclosure can adjust the focal plane of the projection imaging system without changing the distance between the refractive mirror group and the mirror, avoiding image distortion caused by adjusting the distance between the refractive mirror group and the mirror, Improve the imaging quality of the projection imaging system.
在上述实施方式的描述中,具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
以上,仅为本公开的具体实施方式,但本公开的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本公开揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本公开的保护范围之内。因此,本公开的保护范围应以权利要求的保护范围为准。The above is only the specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the disclosure, and should cover It is within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosure should be determined by the scope of the claims.
Claims (25)
- 一种投影装置,包括光源,数字微镜元件,所述数字微镜元件被配置为接受并调制光源出射的光以形成影像光束;A projection apparatus comprising a light source, a digital micromirror element configured to receive and modulate light emitted by a light source to form an image beam;还包括沿着所述数字微镜元件出射的所述影像光束的行进方向依次设置的折射镜组和反射镜,所述折射镜组包括沿所述影像光束的行进方向依次设置的第一镜组、第二镜组和第三镜组,其中,And a refractor group and a mirror sequentially disposed along a traveling direction of the image beam emitted from the digital micromirror device, the refractor group including a first lens group sequentially disposed along a traveling direction of the image beam a second mirror group and a third mirror group, wherein所述第三镜组与所述反射镜之间的距离是固定的,The distance between the third mirror and the mirror is fixed.所述第一镜组和所述第二镜组的至少一个被配置为能够沿所述影像光束的行进方向或所述影像光束行进方向的反方向移动,以调节所述折射镜组和所述反射镜组成的投影成像系统的焦平面,和At least one of the first mirror group and the second mirror group is configured to be movable in a direction opposite to a traveling direction of the image beam or a traveling direction of the image beam to adjust the refractor group and the a focal plane of a projection imaging system consisting of mirrors, and所述第一镜组与所述第二镜组的屈光度为正,所述第三镜组的屈光度为负。The diopter of the first mirror group and the second mirror group is positive, and the refracting power of the third mirror group is negative.
- 根据权利要求1所述的投影装置,其中,所述折射镜组和所述反射镜满足第一公式,所述第一公式为:0.9<L1/L2<1.2,所述L1为所述折射镜组的长度,所述L2为所述折射镜组和所述反射镜之间的间距。The projection apparatus according to claim 1, wherein the refractor group and the mirror satisfy a first formula, the first formula is: 0.9 < L1/L2 < 1.2, and the L1 is the refractor The length of the group, the L2 being the spacing between the set of refractive mirrors and the mirror.
- 根据权利要求2所述的投影装置,其中,69mm≤L2≤91mm。The projection apparatus according to claim 2, wherein 69 mm ≤ L2 ≤ 91 mm.
- 根据权利要求2所述的投影装置,其中,所述折射镜组的所述第一镜组、所述第二镜组和所述第三镜组满足第二公式,所述第二公The projection apparatus according to claim 2, wherein said first mirror group, said second mirror group, and said third mirror group of said refractive mirror group satisfy a second formula, said second public式为:The formula is:其中,所述F为所述折射镜组的等效焦距,所述FB为所述第一镜组的等效焦距,所述FM为所述第二镜组的等效焦距,所述FF为所述第三镜组的等效焦距,所述FC为所述反射镜的等效焦距。Wherein F is an equivalent focal length of the refractive mirror group, the FB is an equivalent focal length of the first mirror group, the FM is an equivalent focal length of the second mirror group, and the FF is An equivalent focal length of the third mirror group, the FC being an equivalent focal length of the mirror.
- 根据权利要求1所述的投影装置,其中,所述投影成像系统还包括振动镜片,所述振动镜片在光路中位于所述折射镜组的上游,且The projection apparatus of claim 1, wherein the projection imaging system further comprises a vibrating lens located upstream of the refractor group in the optical path, and所述振动镜片配置为通过自身振动使得经过所述振动镜片的相邻两帧投影图像对应的所述影像光束不完全重叠,并将所述相邻两帧投影图像对应的影像光束依次射向所述折射镜组,所述投影图像为所述影像光束经过所述投影成像系统后在投影屏幕上呈现的图像。The vibrating lens is configured such that the image beams corresponding to the adjacent two frames of the projected image of the vibrating lens do not completely overlap by the self-vibration, and the image beams corresponding to the adjacent two frames of the projected image are sequentially directed toward the The refractor set is an image that is presented on the projection screen after the image beam passes through the projection imaging system.
- 根据权利要求5所述的投影装置,其中,振动镜片包括可振动的平板玻璃。The projection apparatus according to claim 5, wherein the vibrating lens comprises a vibratable flat glass.
- 根据权利要求5所述的投影装置,其中,所述投影成像系统还包括全反射棱镜,所述全反射棱镜在光路中位于所述振动镜片的上游。The projection apparatus of claim 5, wherein the projection imaging system further comprises a total reflection prism located upstream of the vibrating lens in the optical path.
- 根据权利要求1所述的投影装置,其中,所述第一镜组包括沿所述影像光束的行进方向依次设置的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜、第六透镜、第七透镜、第八透镜、第九透镜、第十一透镜,其中,第四、八、十一透镜的屈光度为负,第一、二、三、五、六、七、九透镜的屈光度为正。The projection apparatus according to claim 1, wherein the first mirror group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens which are sequentially disposed along a traveling direction of the image beam. a sixth lens, a seventh lens, an eighth lens, a ninth lens, and an eleventh lens, wherein the diopter of the fourth, eighth, and eleventh lenses is negative, first, second, third, fifth, sixth, seventh, and nine The diopter of the lens is positive.
- 根据权利要求8所述的投影装置,其中,所述第二透镜、所述第六透镜和所述第七透镜为非球面透镜,所述第一镜组中除所述第二透镜、所述第六透镜和所述第七透镜外的透镜为球面透镜。The projection apparatus according to claim 8, wherein the second lens, the sixth lens, and the seventh lens are aspherical lenses, and the first lens group is apart from the second lens, The sixth lens and the lens outside the seventh lens are spherical lenses.
- 根据权利要求9所述的投影装置,其中,所述第二透镜、第六透镜、第七透镜为轴对称的透镜。The projection apparatus according to claim 9, wherein the second lens, the sixth lens, and the seventh lens are axisymmetric lenses.
- 根据权利要求8所述的投影装置,其中,所述第一镜组还包括设置在所述第九透镜和所述第十一透镜之间的第十透镜,所述第十透镜的屈光度为正。The projection apparatus according to claim 8, wherein the first mirror group further includes a tenth lens disposed between the ninth lens and the eleventh lens, the diopter of the tenth lens being positive .
- 根据权利要求11所述的投影装置,其中,所述第一透镜、所述第五透镜、所述第六透镜和所述第十透镜为凹凸透镜,所述第一透镜、所述第五透镜和所述第六透镜的凸出部分朝向所述影像光束的行进方向的反方向,所述第十透镜的凸出部分朝向所述影像光束的行进方向;The projection apparatus according to claim 11, wherein the first lens, the fifth lens, the sixth lens, and the tenth lens are meniscus lenses, the first lens and the fifth lens And a convex portion of the sixth lens faces an opposite direction of a traveling direction of the image light beam, and a convex portion of the tenth lens faces a traveling direction of the image light beam;所述第二透镜、所述第三透镜、所述第七透镜和所述第九透镜为双凸透镜;The second lens, the third lens, the seventh lens and the ninth lens are lenticular lenses;所述第四透镜、所述第八透镜和所述第十一透镜为双凹透镜。The fourth lens, the eighth lens, and the eleventh lens are biconcave lenses.
- 根据权利要求8所述的投影装置,其中,所述第四透镜的一侧与所述第三透镜相互贴合;The projection apparatus according to claim 8, wherein one side of the fourth lens and the third lens are attached to each other;所述第四透镜的另一侧与所述第五透镜相互贴合。The other side of the fourth lens and the fifth lens are attached to each other.
- 根据权利要求11所述的投影装置,其中,所述第十透镜和所述第十一透镜相互贴合。The projection apparatus according to claim 11, wherein the tenth lens and the eleventh lens are attached to each other.
- 根据权利要求8所述的投影装置,其中,所述第二镜组包括沿所述影像光束的行进方向依次设置的第十二透镜、第十三透镜和第十四透镜,其中,所述第十二透镜与所述第十三透镜屈光度为正,所述第十四透镜屈光度为负。The projection apparatus according to claim 8, wherein the second mirror group includes a twelfth lens, a thirteenth lens, and a fourteenth lens which are sequentially disposed along a traveling direction of the image beam, wherein the The twelve lens and the thirteenth lens have a positive dioptric power, and the fourteenth lens has a negative dioptric power.
- 根据权利要求15所述的投影装置,其中,所述第二镜组中的透镜均为球面透镜。The projection apparatus according to claim 15, wherein the lenses in the second mirror group are all spherical lenses.
- 根据权利要求15所述的投影装置,其中,所述第三镜组包括第十五透镜,所述第十五透镜为屈光度为负。The projection apparatus according to claim 15, wherein the third mirror group includes a fifteenth lens, and the fifteenth lens has a negative refractive power.
- 根据权利要求17所述的投影装置,其中,所述第十五透镜为非球面透镜。The projection apparatus according to claim 17, wherein the fifteenth lens is an aspherical lens.
- 根据权利要求15所述的投影装置,其中,所述第十三透镜和所述第十四透镜相互贴合。The projection apparatus according to claim 15, wherein the thirteenth lens and the fourteenth lens are attached to each other.
- 根据权利要求1所述的投影装置,其中,所述第一镜组包括沿所述影像光束的行进方向依次设置的第二十一透镜、第二十二透镜、第二十三透镜、第二十四透镜、第二十五透镜、第二十六透镜、第二十七透镜、第二十八透镜、第二十九透镜、第三十透镜;其中,The projection apparatus according to claim 1, wherein the first mirror group includes a twenty-first lens, a twenty-second lens, a twenty-third lens, and a second, which are sequentially disposed along a traveling direction of the image beam a fourteenth lens, a twenty-fifth lens, a twenty-sixth lens, a twenty-seventh lens, a twenty-eighth lens, a twenty-ninth lens, a thirtieth lens; wherein所述第二十六透镜和所述第二十七透镜为非球面透镜,所述第一镜组中除所述第二十六透镜和所述第二十七透镜外的透镜均为球面透镜;The twenty-sixth lens and the twenty-seventh lens are aspherical lenses, and the lenses of the first lens group other than the twenty-sixth lens and the twenty-seventh lens are spherical lenses ;所述第二十四透镜、第二十八透镜和第二十九透镜的屈光度为负,所述第二十一透镜、第二十二透镜、第二十三透镜、第二十五透镜、第二十六透镜、第二十七透镜和第三十透镜的屈光度为正。The twentieth lens, the twenty-eighth lens, and the twenty-ninth lens have negative diopter, and the twenty-first lens, the twenty-second lens, the twenty-third lens, the twenty-fifth lens, The diopter of the twenty-sixth lens, the twenty-seventh lens, and the thirtieth lens is positive.
- 根据权利要求20所述的投影装置,其中,所述第二十三透镜、第二十四透镜和第二十五透镜依次胶合在一起,所述第二十九透镜与 所述第三十透镜胶合在一起。The projection apparatus according to claim 20, wherein said twenty-third lens, said twenty-fourth lens and said twenty-fifth lens are sequentially glued together, said twenty-ninth lens and said thirtyth lens Glued together.
- 根据权利要求20所述的投影装置,其中,述第二十五透镜、所述第二十六透镜均为凸出部分朝向所述影像光束的行进方向的反方向的凸凹透镜;The projection apparatus according to claim 20, wherein the twenty-fifth lens and the second sixteenth lens are convex and concave lenses in which a convex portion faces in a direction opposite to a traveling direction of the image light beam;所述第二十一透镜、所述第二十二透镜、所所述第二十三透镜、所述第二十七透镜和所述第三十透镜均为双凸透镜;The twenty-first lens, the twenty-second lens, the twenty-third lens, the twenty-seventh lens, and the thirtieth lens are all lenticular lenses;所述第二十四透镜、所述第二十八透镜和所述第二十九透镜均为双凹透镜。The twenty-fourth lens, the twenty-eighth lens, and the twenty-ninth lens are both biconcave lenses.
- 根据权利要求18所述的投影装置,其中,The projection apparatus according to claim 18, wherein所述第十五透镜为轴对称非球面透镜。The fifteenth lens is an axisymmetric aspheric lens.
- 根据权利要求1所述的投影装置,其中,所述投影成像系统的后焦距BFL满足:20mm≤BFL≤34mm。The projection apparatus according to claim 1, wherein a back focus BFL of the projection imaging system satisfies: 20 mm ≤ BFL ≤ 34 mm.
- 根据权利要求1所述的投影装置,其中,所述反射镜为凹面非球面反射镜或者自由曲面反射镜。The projection apparatus according to claim 1, wherein the mirror is a concave aspherical mirror or a free-form surface mirror.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810433755.9A CN110456599B (en) | 2018-05-08 | 2018-05-08 | Projection imaging system and laser projection device |
CN201810434257.6A CN110456600B (en) | 2018-05-08 | 2018-05-08 | Projection lens and laser projection device |
CN201810433755.9 | 2018-05-08 | ||
CN201810433710.1A CN110456491B (en) | 2018-05-08 | 2018-05-08 | Projection imaging system and laser projection device |
CN201810434257.6 | 2018-05-08 | ||
CN201810433710.1 | 2018-05-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019214317A1 true WO2019214317A1 (en) | 2019-11-14 |
Family
ID=68466650
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2019/075892 WO2019214317A1 (en) | 2018-05-08 | 2019-02-22 | Projection device |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2019214317A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102269917A (en) * | 2010-06-02 | 2011-12-07 | 日立民用电子株式会社 | Projection type image display apparatus |
CN104181695A (en) * | 2013-05-20 | 2014-12-03 | 株式会社理光 | Projection optical system and image display apparatus |
CN105892025A (en) * | 2015-02-18 | 2016-08-24 | 精工爱普生株式会社 | Projection optical system |
CN106125265A (en) * | 2016-08-17 | 2016-11-16 | 海信集团有限公司 | Projection imaging system |
CN106842590A (en) * | 2017-03-28 | 2017-06-13 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
CN107144944A (en) * | 2017-07-19 | 2017-09-08 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
CN107664823A (en) * | 2017-10-23 | 2018-02-06 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system of ultra-small volume 4K resolution ratio |
US20180074302A1 (en) * | 2015-08-27 | 2018-03-15 | Yohei Takano | Projection optical system, projection apparatus, and projection system |
-
2019
- 2019-02-22 WO PCT/CN2019/075892 patent/WO2019214317A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102269917A (en) * | 2010-06-02 | 2011-12-07 | 日立民用电子株式会社 | Projection type image display apparatus |
CN104181695A (en) * | 2013-05-20 | 2014-12-03 | 株式会社理光 | Projection optical system and image display apparatus |
CN105892025A (en) * | 2015-02-18 | 2016-08-24 | 精工爱普生株式会社 | Projection optical system |
US20180074302A1 (en) * | 2015-08-27 | 2018-03-15 | Yohei Takano | Projection optical system, projection apparatus, and projection system |
CN106125265A (en) * | 2016-08-17 | 2016-11-16 | 海信集团有限公司 | Projection imaging system |
CN106842590A (en) * | 2017-03-28 | 2017-06-13 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
CN107144944A (en) * | 2017-07-19 | 2017-09-08 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
CN107664823A (en) * | 2017-10-23 | 2018-02-06 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system of ultra-small volume 4K resolution ratio |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6530796B2 (en) | Projection optical system | |
US7738190B2 (en) | Optical engine and wide angle projection lens module thereof | |
CN104570296B (en) | ultra-short focus projection lens | |
TWI781947B (en) | Optical lens | |
US8279527B2 (en) | Wide-angle projection optical system | |
JP6035416B2 (en) | Projection display device | |
CN111208701B (en) | Laser projection device | |
JP2015108797A (en) | Wide-angle projection optical system | |
CN106896480B (en) | Telecentric zoom lens of projector | |
CN105974560A (en) | Wide-angle projection system and lens | |
CN110456600B (en) | Projection lens and laser projection device | |
CN109407288B (en) | Refraction and reflection type ultra-short-focus projection lens system | |
CN110456491B (en) | Projection imaging system and laser projection device | |
CN107817593B (en) | Ultra-short focal projection lens | |
CN110456599B (en) | Projection imaging system and laser projection device | |
CN105759405B (en) | Optical system capable of increasing field angle and projection lens | |
JP6390882B1 (en) | Image projection device | |
CN112578610B (en) | Projection lens and laser projection equipment | |
WO2019214317A1 (en) | Projection device | |
TWI438548B (en) | Projection apparatus | |
JP2004233797A (en) | Projection lens | |
TWI809587B (en) | Projection lens | |
CN217655349U (en) | Projection lens and projection device | |
WO2020187204A1 (en) | Laser projection device | |
CN109975951B (en) | Projection lens and projection system |
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: 19798838 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: 19798838 Country of ref document: EP Kind code of ref document: A1 |