WO2023070826A1 - 投影光机 - Google Patents

投影光机 Download PDF

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Publication number
WO2023070826A1
WO2023070826A1 PCT/CN2021/135212 CN2021135212W WO2023070826A1 WO 2023070826 A1 WO2023070826 A1 WO 2023070826A1 CN 2021135212 W CN2021135212 W CN 2021135212W WO 2023070826 A1 WO2023070826 A1 WO 2023070826A1
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Prior art keywords
lens
projection
image
image source
projection lens
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PCT/CN2021/135212
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English (en)
French (fr)
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赵云
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歌尔光学科技有限公司
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Publication of WO2023070826A1 publication Critical patent/WO2023070826A1/zh

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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
    • 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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • 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 application relates to the field of projection technology, in particular to a projection light machine.
  • offset is a key parameter, which represents the ratio of the distance between the position where the optical axis of the projection light machine is projected onto the projection screen and the center of the projection screen, and half the width of the projection screen.
  • the existing projection light machine can achieve a bias of 0%, that is, the center of the projection screen coincides with the optical axis, or a projection light machine with a bias of 100%, that is, the center of one edge of the projection screen coincides with the optical axis.
  • the projection light machine with the above-mentioned offset may have the situation that the projection picture is blocked by the projection light machine when viewed from the perspective of the observer.
  • the purpose of the invention is to provide a projection light machine that can achieve a large offset and avoid the situation that the projected picture is blocked in some application scenarios.
  • the present invention provides the following technical solutions:
  • a projection light machine comprising a projection lens and an image source
  • the image source is used to project light to the projection lens
  • the field angle and focal length of the projection lens are such that the image source can be positioned at the projection lens In the image circle of the projection lens, the position of the projection lens relative to the image source satisfies the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens, and the distance from the image source projected by the image source
  • the ratio to half the image size within the image circle of the projection lens is greater than one.
  • the position of the projection lens relative to the image source satisfies the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens, and the distance from the center of the image projected by the image source to the image circle of the projection lens.
  • the ratio of half the size of the image in the image circle of the projection lens is greater than or equal to 1.5.
  • the position of the projection lens relative to the image source can be changed, so that the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens can be changed.
  • the position of the projection lens relative to the image source is changed by moving the projection lens relative to the image source.
  • the projection lens includes a first lens group and a second lens group arranged sequentially along the optical axis from the projection screen side to the image source side, the first lens group has negative refractive power, and the second lens group The group has positive optical power.
  • the first lens group includes a first lens, and the distance from the first lens to the projection screen is smaller than the distance from any other lens in the first lens group to the projection screen, and at least one of the first lenses
  • the surface is aspheric;
  • the second lens group includes a seventh lens, the distance between the seventh lens and the image source is smaller than the distance between any other lens in the second lens group and the image source, and the first At least one surface of the seven lenses is aspherical.
  • the first lens group includes a first lens, a second lens and a third lens
  • the radius of curvature of the front surface of the first lens is positive
  • the radius of curvature of the rear surface is positive
  • the front surface of the second lens is is a plane
  • the radius of curvature of the rear surface is positive
  • the radius of curvature of the front surface of the third lens is positive
  • the radius of curvature of the rear surface is negative.
  • the second lens group includes a fourth lens, a fifth lens, a sixth lens and a seventh lens
  • the radius of curvature of the front surface of the fourth lens is positive
  • the radius of curvature of the rear surface is negative
  • the radius of curvature of the first lens is The radius of curvature of the front surface of the fifth lens is negative
  • the radius of curvature of the rear surface is positive
  • the radius of curvature of the front surface of the sixth lens is positive
  • the radius of curvature of the rear surface is negative
  • the radius of curvature of the front surface of the seventh lens is Positive
  • the radius of curvature of the back surface is negative.
  • the fourth lens, the fifth lens and the sixth lens are glued together in sequence.
  • the first lens group includes a first lens, a second lens and a third lens, which have negative refractive power, negative refractive power and positive refractive power in turn;
  • the second lens group includes a fourth lens, a second lens, and a third lens.
  • the fifth lens, the sixth lens and the seventh lens have negative refractive power, negative refractive power, positive refractive power and positive refractive power in sequence.
  • a light projection machine provided by the present invention includes a projection lens and an image source.
  • the image source is used to project light to the projection lens. In the image circle, ensure that the light projected by the image source can pass through the projection lens to form a clear image.
  • the position of the projection lens relative to the image source satisfies the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens, and the ratio of half the size of the image projected by the image source into the image circle of the projection lens is greater than 1,
  • the ratio of the distance from the position where the optical axis of the projection lens is projected onto the projection screen to the center of the projection screen is greater than 1 to half the size of the projection screen, which means that the projection light machine can achieve a large offset, thereby avoiding the use of In case the projection screen is blocked.
  • Fig. 1 is the schematic diagram that represents projection lens image circle in the embodiment of the present invention
  • Fig. 2 is the schematic diagram that image source is projected on the image circle of projection lens in the embodiment of the present invention
  • Fig. 3 is a schematic diagram of a picture projected by a light projector of a specific example of the present invention.
  • Fig. 4 is a schematic diagram of a picture projected by the light projector of another specific example of the present invention.
  • Fig. 5 is the schematic diagram that image source is projected on the image circle of projection lens in another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a projection lens of a projection light machine according to an embodiment of the present invention.
  • Fig. 7 is a field curvature curve diagram of the projection lens shown in Fig. 6;
  • Fig. 8 is a distortion curve diagram of the projection lens shown in Fig. 6;
  • FIG. 9 is an MTF diagram of the projection lens shown in FIG. 6 .
  • This embodiment provides a light projection machine, including a projection lens and an image source, the image source is used to project light to the projection lens, and the viewing angle and focal length of the projection lens meet the requirements that the image source can be located at In the image circle of the projection lens, the position of the projection lens relative to the image source satisfies the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens, and the The ratio of half the size of the image projected by the image source to the image circle of the projection lens is greater than 1.
  • the image circle of the projection lens refers to an area on the focal plane of the projection lens, and the light in this area can be clearly imaged after passing through the projection lens.
  • the fact that the image source is located within the image circle of the projection lens means that the light projected by the image source can form a clear image within the image circle of the projection lens after passing through the projection lens.
  • the image source 101 is located in the image circle of the projection lens 100 , and the light projected by the image source 101 can form a clear image in the image circle of the projection lens 100 after passing through the projection lens 100 .
  • FIG. 2 is a schematic diagram of the image source projected onto the image circle of the projection lens in this embodiment. Since the projection light machine of this embodiment sets the image source 101 within the image circle of the projection lens 100, the image source 101 The image 103 projected onto the image circle of the projection lens 100 is within the image circle 102 of the projection lens. The optical projection machine of this embodiment sets the center of the image source 101 away from the optical axis of the projection lens 100, that is, the center of the image projected by the image source 101 on the image circle of the projection lens 100 deviates from the optical axis of the projection lens 100, and the two do not coincide.
  • the position of the projection lens 100 relative to the image source 101 to meet the distance from the center of the image 103 projected by the image source 101 into the image circle of the projection lens to the optical axis of the projection lens 100, and the distance from the center of the image 103 projected by the image source 101 into the image circle of the projection lens.
  • the ratio of half of the size like 103 is greater than 1.
  • the viewing angle and focal length of the projection lens are such that the image source is located within the image circle of the projection lens, ensuring that all the light projected by the image source can pass through the projection lens to form a clear image.
  • the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens, and the ratio of half the size of the image projected by the image source into the image circle of the projection lens is greater than 1, so that the optical axis of the projection lens is projected to the projection lens.
  • the ratio of the distance from the position on the screen to the center of the projection screen to half the size of the projection screen is greater than 1, which means that the projection light machine can achieve a large offset, which can avoid the situation that the projection screen is blocked in some application scenarios.
  • the position of the projection lens 100 relative to the image source 101 satisfies the distance from the center of the image projected by the image source 101 into the image circle of the projection lens to the optical axis of the projection lens 100, and the distance from the image source 101 projected to the The ratio of half of the image size in the image circle of the projection lens 100 is greater than or equal to 1.5.
  • the distance from the position where the optical axis of the projection lens 100 projects onto the projection screen to the center of the projection screen is greater than or equal to 1.5 to half the size of the projection screen, that is, the offset of the projection light machine is greater than or equal to 1.5.
  • the size of the image projected by the image source 101 through the projection lens 100 may be the width or length of the image projected by the image source 101 through the projection lens 100 . If the image source 101 has other shapes, the size of the image projected by the image source 101 through the projection lens 100 may be other sizes of the image projected by the image source 101 .
  • FIG. 3 is a schematic diagram of a specific example of a picture projected by the optical projection machine.
  • the optical projection machine 104 projects an image picture.
  • the distance from the position where the optical axis of the projection lens is projected on the projection picture to the center of the projection picture The ratio of half the width of the projection screen is 150%.
  • FIG. 4 is a schematic diagram of another specific example of a projection light machine projecting a picture.
  • the projection light machine 104 projects an image picture to the ground.
  • the ratio of the distance to half the width of the projection screen, that is, the offset of the projection light engine, is 162%.
  • the position of the projection lens 101 relative to the image source 100 can be changed, so that the image source 101 is projected onto the image center of the image circle of the projection lens 100 to the distance from the optical axis of the projection lens 100
  • the distance can be changed, so that the distance from the center of the image projected by the image source 101 into the image circle of the projection lens 100 to the optical axis of the projection lens 100, and the ratio of half the image size projected by the image source 101 into the image circle of the projection lens 100 can be changed,
  • This enables the projection light machine to change the bias size.
  • the offset size of the projection light machine can be adjusted according to the application requirements, which is more convenient to use.
  • the projection lens 100 can move relative to the image source 101 , so as to change the position of the projection lens 100 relative to the image source 101 .
  • Exemplary reference can be made to Figure 5, which is a schematic diagram of an image source projected onto the image circle of the projection lens in yet another embodiment, and the arrows in the figure represent the movement of the image circle 102 of the projection lens relative to the image 103 corresponding to the image source direction.
  • the projection lens 100 can be set to translate up and down relative to the image source 101, so that the image 103 projected by the image source 101 into the image circle of the projection lens can translate up and down relative to the image circle 102, and the projection light machine can be shifted vertically.
  • the set size is adjustable.
  • the projection lens 100 can be set to translate left and right relative to the image source 101, so that the image 103 projected by the image source 101 into the image circle of the projection lens 100 can translate left and right relative to the image circle 102, so that the projection light machine can be shifted in the horizontal direction.
  • the set size is adjustable. It should be noted that when the projection lens 100 is moved relative to the image source 101 , the projection lens 100 is required to move to any position relative to the image source 101 , and the image source 101 is always within the image circle of the projection lens 100 .
  • the image source may be, but not limited to, a digital micromirror device (Digital Micromirror Device, DMD).
  • DMD Digital Micromirror Device
  • the projection light engine may further include a prism arranged between the image source 101 and the projection lens 100 , and the light emitted by the image source 101 enters the projection lens 100 after being transmitted through the prism.
  • the prism can be but not limited to a right triangle prism.
  • the projection lens in the projection light engine of this embodiment may include a first lens group and a second lens group arranged sequentially along the optical axis from the projection screen side to the image source side, the first lens group has a negative light Power, the second lens group has positive power.
  • the angle of view and focal length of the projection lens of this embodiment meet the requirements that the image source can be located in the image circle of the projection lens, and the number of lens groups included in the projection lens is small, which helps to reduce the lens volume and is beneficial to be applied to micro-projection instrument.
  • the first lens group includes a first lens
  • the distance from the first lens to the projection screen is smaller than the distance from any other lens in the first lens group to the projection screen
  • at least one surface of the first lens is Aspherical.
  • the aberration of the peripheral field of view occupies the main part, and the most effective way to reduce the peripheral aberration is to use aspheric lenses at both ends of the lens, so the first lens of this projection lens adopts aspheric surface, The edge aberration can be effectively reduced, and the imaging quality of the projection lens can be improved.
  • the second lens group includes a seventh lens
  • the distance between the seventh lens and the image source is smaller than the distance between any other lens in the second lens group and the image source
  • the distance of the seventh lens is At least one surface is aspheric.
  • the seventh lens closest to the image source adopts an aspheric surface, which can effectively reduce peripheral aberrations and improve the imaging quality of the projection lens.
  • the projection lens can be provided with at least one diaphragm according to requirements, so as to reduce stray light and help improve image quality.
  • the front surface and the rear surface of each lens of the projection lens can be provided with an anti-reflection film, and the anti-reflection film can enhance the efficiency of light transmission through the lens, reduce the loss of light energy, and help improve the quality of the image projected by the projection machine.
  • the front surface of the lens refers to the surface of the lens facing the projection screen side
  • the rear surface of the lens refers to the surface of the lens facing the image source side.
  • FIG. 6 is a schematic diagram of a projection lens of a projection light machine provided by an embodiment.
  • the projection lens includes sequentially along the optical axis from the projection screen side to the image source side
  • the first lens group G1 and the second lens group G2 are set.
  • the first lens group G1 includes a first lens 11 , a second lens 12 and a third lens 13 , and each lens has negative refractive power, negative refractive power and positive refractive power in sequence.
  • the radius of curvature of the front surface of the first lens 11 is positive
  • the radius of curvature of the rear surface is positive
  • the front surface of the second lens 12 is a plane
  • the radius of curvature of the rear surface is positive
  • the radius of curvature of the front surface of the third lens 13 is positive
  • Surfaces have a negative radius of curvature.
  • the second lens group G2 includes a fourth lens 14, a fifth lens 15, a sixth lens 16, and a seventh lens 17, each lens having negative power, negative power, positive power, and positive power in sequence.
  • the radius of curvature of the front surface of the fourth lens 14 is positive, the radius of curvature of the rear surface is negative, the radius of curvature of the front surface of the fifth lens 15 is negative, the radius of curvature of the rear surface is positive, and the radius of curvature of the front surface of the sixth lens 16 is positive, the radius of curvature of the rear surface is negative, the radius of curvature of the front surface of the seventh lens 17 is positive, and the radius of curvature of the rear surface is negative.
  • the fourth lens 14, the fifth lens 15, and the sixth lens 16 are cemented together in sequence, and the use of cemented lenses can reduce the chromatic aberration of the projection lens, and can also reduce the difficulty of lens assembly process.
  • a stop 10 is provided between the first lens group G1 and the second lens group G2.
  • the detailed optical data of the projection lens of this embodiment is shown in Table 1, and the units of thickness and semi-aperture are mm.
  • the Lens shape optical power thickness Refractive index Abbe number half diameter first lens 11 Aspherical -0.064 2.825 1.53 5.58 9.19 second lens 12 sphere -0.081 2.812 1.62 63.4 6.5 third lens 13 sphere 0.08 4 1.83 42.7 5.4 Fourth lens 14 sphere -0.006 4.6 1.6 65.5 4.36 fifth lens 15 sphere -0.028 1.476 1.81 25.5 4.5
  • sixth lens 16 sphere 0.038 4 1.79 44.2 5.5
  • seventh lens 17 Aspherical 0.063 3.1 1.59 61.2 5.5
  • the first lens 11 and the seventh lens 17 adopt an aspherical design, and the curve equation of the aspheric surface is expressed as follows:
  • z represents the vertical distance between the point on the aspheric surface and the optical axis
  • c represents the curvature of the apex of the aspheric surface
  • K represents the quadratic surface coefficient
  • A1, A2, A3, A4, A5 are high-order even-order aspheric surfaces coefficient.
  • the aspheric coefficients of the first lens 11 and the seventh lens 17 are as shown in Table 2, wherein the surface 11a and the surface 11b represent the front surface and the rear surface of the first lens 11 respectively, and the surface 17a and the surface 17b represent the surface of the seventh lens 17 respectively. front and back surfaces.
  • the field curvature curve, distortion curve and MTF diagram of the projection lens in this embodiment are shown in Fig. 7, Fig. 8 and Fig. 9 respectively.
  • Table 3 shows the ranges of effective apertures and focal length ratios of the first lens to the seventh lens.
  • the Range of effective aperture/focal length first lens 11 0.58 ⁇ 0.6 second lens 12 0.51 ⁇ 0.53 third lens 13 0.42 ⁇ 0.44 Fourth lens 14 0.02 ⁇ 0.04 fifth lens 15 0.12 ⁇ 0.14
  • sixth lens 16 0.2 ⁇ 0.22 seventh lens 17 0.34 ⁇ 0.36
  • the projection lens of this embodiment is applied to a projection light machine.
  • a prism 105 is disposed between the projection lens and the image source 101 .
  • the projection lens of this embodiment only uses 7 lenses, which can achieve a projection effect of 162% offset when applied to a projection light engine, which enhances user experience.

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Abstract

一种投影光机，包括投影镜头（100）和图像源（101），图像源（101）用于向投影镜头（100）投射出光线，投影镜头（100）的视场角（θ）和焦距（F）满足使图像源（101）能够位于投影镜头（100）的像圆（102）内，保证图像源（101）投射出的光线都能够通过投影镜头（100）后形成清晰图像。并且，投影镜头（100）相对于图像源（101）的位置满足图像源（101）投射到投影镜头（100）像圆（102）内的像（103）中心到投影镜头（100）光轴的距离，与图像源（101）投射到投影镜头（100）像圆（102）内的像（103）尺寸一半的比值大于1，这样相应使得投影镜头（100）光轴投射到投影画面上的位置到投影画面中心的距离，与投影画面尺寸一半的比值大于1，即使得投影光机达到较大的偏置，从而能够避免在一些应用场景中投影画面被遮挡的情况。

Description

投影光机
本申请要求于2021年10月30日提交中国专利局、申请号为202111275316.8、发明名称为“投影光机”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。
技术领域
本申请涉及投影技术领域，特别是涉及一种投影光机。
背景技术
随着微型投影仪技术的发展，超短焦投影仪逐渐进入人们的视野。目前，微型投影仪主要应用于家庭娱乐、教育学习、商务会议或者军事等领域。在投影光机领域中，偏置(offset)是一项关键参数，它表示投影光机光轴投射到投影画面上的位置与投影画面中心的距离，与投影画面宽度一半的比值。
现有的投影光机能够达到偏置为0％，即投影画面中心与光轴重合，或者投影光机的偏置为100％，即投影画面一侧边缘的中心与光轴重合。然而，在投影光机处于观察者和投影画面之间的应用场景下，具有上述偏置的投影光机会存在从观察者的角度观看时，投影画面被投影光机遮挡的情况。
发明内容
发明的目的是提供一种投影光机，能够达到较大的偏置，能够避免在一些应用场景中投影画面被遮挡的情况。
为实现上述目的，本发明提供如下技术方案：
一种投影光机，包括投影镜头和图像源，所述图像源用于向所述投影镜头投射出光线，所述投影镜头的视场角和焦距满足使所述图像源能够位于所述投影镜头的像圆内，所述投影镜头相对于所述图像源的位置满足所述图像源投射到所述投影镜头像圆内的像中心到所述投影镜头光轴的距离，与所述图像源投射到所述投影镜头像圆内的像尺寸一半的比值大于1。
优选的，所述投影镜头相对于所述图像源的位置满足所述图像源投射到 所述投影镜头像圆内的像中心到所述投影镜头光轴的距离，与所述图像源投射到所述投影镜头像圆内的像尺寸一半的比值大于等于1.5。
优选的，所述投影镜头相对于所述图像源的位置可改变，使得所述图像源投射到所述投影镜头像圆内的像中心到所述投影镜头光轴的距离可改变。
优选的，通过将所述投影镜头相对于所述图像源移动，改变所述投影镜头相对于所述图像源的位置。
优选的，所述投影镜头包括从投影画面侧到图像源侧沿着光轴依次设置的第一透镜组和第二透镜组，所述第一透镜组具有负光焦度，所述第二透镜组具有正光焦度。
优选的，所述第一透镜组包括第一透镜，所述第一透镜到投影画面的距离小于所述第一透镜组中其它任一透镜到投影画面的距离，所述第一透镜的至少一表面为非球面；
或/和，所述第二透镜组包括第七透镜，所述第七透镜到所述图像源的距离小于所述第二透镜组中其它任一透镜到所述图像源的距离，所述第七透镜的至少一表面为非球面。
优选的，所述第一透镜组包括第一透镜、第二透镜和第三透镜，所述第一透镜前表面的曲率半径为正，后表面的曲率半径为正，所述第二透镜前表面为平面，后表面的曲率半径为正，所述第三透镜前表面的曲率半径为正，后表面的曲率半径为负。
优选的，所述第二透镜组包括第四透镜、第五透镜、第六透镜和第七透镜，所述第四透镜前表面的曲率半径为正，后表面的曲率半径为负，所述第五透镜前表面的曲率半径为负，后表面的曲率半径为正，所述第六透镜前表面的曲率半径为正，后表面的曲率半径为负，所述第七透镜前表面的曲率半径为正，后表面的曲率半径为负。
优选的，所述第四透镜、所述第五透镜和所述第六透镜依次胶合。
优选的，所述第一透镜组包括第一透镜、第二透镜和第三透镜，依次具有负光焦度、负光焦度和正光焦度；所述第二透镜组包括第四透镜、第五透镜、第六透镜和第七透镜，依次具有负光焦度、负光焦度、正光焦度和正光焦度。
由上述技术方案可知，本发明所提供的一种投影光机包括投影镜头和图 像源，图像源用于向投影镜头投射出光线，投影镜头的视场角和焦距满足使图像源能够位于投影镜头的像圆内，保证图像源投射出的光线都能够通过投影镜头后形成清晰图像。并且，投影镜头相对于图像源的位置满足图像源投射到投影镜头像圆内的像中心到投影镜头光轴的距离，与图像源投射到投影镜头像圆内的像尺寸一半的比值大于1，这样相应使得投影镜头光轴投射到投影画面上的位置到投影画面中心的距离，与投影画面尺寸一半的比值大于1，即使得投影光机达到较大的偏置，从而能够避免在一些应用场景中投影画面被遮挡的情况。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术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申请的一部分附图，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，还可以根据提供的附图获得其他的附图。
图1为本发明实施例中表示投影镜头像圆的示意图；
图2为本发明实施例中图像源投射到投影镜头像圆上的示意图；
图3为本发明一具体实例的投影光机投射出画面的示意图；
图4为本发明又一具体实例的投影光机投射出画面的示意图；
图5为本发明又一实施例中图像源投射到投影镜头像圆上的示意图；
图6为本发明一实施例提供的一种投影光机的投影镜头的示意图；
图7为图6所示投影镜头的场曲曲线图；
图8为图6所示投影镜头的畸变曲线图；
图9为图6所示投影镜头的MTF图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
本实施例提供一种投影光机，包括投影镜头和图像源，所述图像源用于向所述投影镜头投射出光线，所述投影镜头的视场角和焦距满足使所述图像源能够位于所述投影镜头的像圆内，所述投影镜头相对于所述图像源的位置满足所述图像源投射到所述投影镜头像圆内的像中心到所述投影镜头光轴的距离，与所述图像源投射到所述投影镜头像圆内的像尺寸一半的比值大于1。
投影镜头的像圆是指在投影镜头焦平面上的一片区域，该区域内的光线通过投影镜头后都能够清晰成像。图像源位于投影镜头的像圆内是指图像源投射出的光线通过投影镜头后，都能够在投影镜头的像圆内形成清晰图像。可参考图1所示，图1为本实施例中表示投影镜头像圆的示意图，投影镜头100的焦距为F，视场角为θ，投影镜头100的像圆是指位于投影镜头100的焦平面上的、以投影镜头100光轴为中心、直径为H的圆形区域。图像源101位于投影镜头100的像圆内，则图像源101投射出的光线通过投影镜头100后，都能够在投影镜头100的像圆内形成清晰图像。
可参考图2所示，图2为本实施例中图像源投射到投影镜头像圆上的示意图，由于本实施例的投影光机设置图像源101位于投影镜头100的像圆内，因此图像源101投射到投影镜头100像圆上的像103在投影镜头的像圆102内。本实施例的投影光机设置图像源101中心偏离投影镜头100的光轴，即图像源101投射到投影镜头100像圆上的像中心与投影镜头100的光轴偏离，两者不重合。并且，具体设置投影镜头100相对于图像源101的位置满足图像源101投射到投影镜头像圆内的像103中心到投影镜头100光轴的距离，与图像源101投射到投影镜头像圆内的像103尺寸一半的比值大于1。
本实施例的投影光机，投影镜头的视场角和焦距满足使图像源位于投影镜头的像圆内，保证图像源投射出的光线都能够通过投影镜头后形成清晰图像。并且图像源投射到投影镜头像圆内的像中心到投影镜头光轴的距离，与图像源投射到投影镜头像圆内的像尺寸一半的比值大于1，这样相应使得投影 镜头光轴投射到投影画面上的位置到投影画面中心的距离，与投影画面尺寸一半的比值大于1，即使得投影光机达到较大的偏置，能够避免在一些应用场景中投影画面被遮挡的情况。
优选的，投影镜头100相对于图像源101的位置满足图像源101投射到所述投影镜头像圆内的像中心到所述投影镜头100光轴的距离，与所述图像源101投射到所述投影镜头100像圆内的像尺寸一半的比值大于等于1.5。那么，相应会使得投影镜头100光轴投射到投影画面上的位置到投影画面中心的距离，与投影画面尺寸一半的比值大于等于1.5，即使得投影光机的偏置大于等于1.5。
若图像源101为方形，图像源101通过投影镜头100投射出的像尺寸可以是图像源101通过投影镜头100投射出的像的宽度或者长度。若图像源101为其它形状，图像源101通过投影镜头100投射出的像尺寸可以是图像源101投射出的像的其它尺寸。
可参考图3所示，图3为一具体实例的投影光机投射出画面的示意图，投影光机104投射出图像画面，投影镜头光轴投射到投影画面上的位置到投影画面中心的距离与投影画面宽度一半的比值即偏置为150％。
参考图4所示，图4为又一具体实例的投影光机投射出画面的示意图，投影光机104向地面投射出图像画面，投影镜头光轴投射到投影画面上的位置到投影画面中心的距离与投影画面宽度一半的比值即投影光机的偏置为162％。
进一步优选的，本实施例的投影光机中，投影镜头101相对于所述图像源100的位置可改变，使得图像源101投射到投影镜头100像圆内的像中心到投影镜头100光轴的距离可改变，从而使得图像源101投射到投影镜头100像圆内的像中心到投影镜头100光轴的距离，与图像源101投射到投影镜头100像圆内的像尺寸一半的比值可以改变，使得本投影光机可以改变偏置大小。在实际应用中，可以根据应用需求调节投影光机的偏置大小，使用更方便。
可以设置投影镜头100可相对于图像源101移动，从而改变投影镜头100相对于图像源101的位置。示例性的可参考图5所示，图5为又一实施例中图像源投射到投影镜头像圆上的示意图，图中箭头表示投影镜头的像圆102相对于图像源对应的像103的移动方向。如图所示可设置投影镜头100可以相对于图像源101上下平移，使得图像源101投射到投影镜头像圆内的像103相对于像圆 102能上下平移，可以实现投影光机在垂直方向偏置大小的可调。或者，可设置投影镜头100可以相对于图像源101左右平移，使得图像源101投射到投影镜头100像圆内的像103相对于像圆102能左右平移，从而可以实现投影光机在水平方向偏置大小的可调。其中需要说明的是，在将投影镜头100相对于图像源101移动时，要求投影镜头100相对于图像源101移动到任一位置处，图像源101始终处于投影镜头100的像圆内。
图像源可采用但不限于数字微镜器件(Digital Micromirror Device，DMD)。
优选的，投影光机还可包括设置在图像源101和投影镜头100之间的棱镜，图像源101发出的光线通过棱镜传导后进入投影镜头100。棱镜可采用但不限于直角三角形棱镜。
可选的，本实施例的投影光机中投影镜头可包括从投影画面侧到图像源侧沿着光轴依次设置的第一透镜组和第二透镜组，所述第一透镜组具有负光焦度，所述第二透镜组具有正光焦度。本实施例的投影镜头的视场角和焦距满足使图像源能够位于投影镜头的像圆内，并且本投影镜头包含的透镜组数量少，有助于减小镜头体积，有利于应用于微型投影仪。
优选的，第一透镜组包括第一透镜，所述第一透镜到投影画面的距离小于所述第一透镜组中其它任一透镜到投影画面的距离，所述第一透镜的至少一表面为非球面。对于大视场角的镜头，边缘视场的像差占据主要部分，而降低边缘像差的最有效途径是在镜头的两端使用非球面镜片，因而本投影镜头的第一透镜采用非球面，能够有效地降低边缘像差，提高投影镜头的成像质量。
优选的，第二透镜组包括第七透镜，所述第七透镜到所述图像源的距离小于所述第二透镜组中其它任一透镜到所述图像源的距离，所述第七透镜的至少一表面为非球面。本投影镜头中距离图像源最近的第七透镜采用非球面，能够有效地降低边缘像差，提高投影镜头的成像质量。
优选的，本投影镜头依需求可设置至少一光阑，以减少杂散光，有助于提升成像质量。
优选的，本投影镜头的各个透镜的前表面和后表面可设置增透膜，通过 增透膜增强光透射过透镜的效率，降低光能量损失，有助于提高投影光机投射图像的质量。本实施例的投影镜头中，透镜的前表面是指透镜朝向投影画面侧的表面，透镜的后表面是指透镜朝向图像源侧的表面。
可选的请参考图6，图6为一实施例提供的一种投影光机的投影镜头的示意图，如图所示，所述投影镜头包括从投影画面侧到图像源侧沿着光轴依次设置的第一透镜组G1和第二透镜组G2。
其中，第一透镜组G1包括第一透镜11、第二透镜12和第三透镜13，各个透镜依次具有负光焦度、负光焦度和正光焦度。第一透镜11前表面的曲率半径为正，后表面的曲率半径为正，第二透镜12前表面为平面，后表面的曲率半径为正，第三透镜13前表面的曲率半径为正，后表面的曲率半径为负。
第二透镜组G2包括第四透镜14、第五透镜15、第六透镜16和第七透镜17，各个透镜依次具有负光焦度、负光焦度、正光焦度和正光焦度。第四透镜14前表面的曲率半径为正，后表面的曲率半径为负，第五透镜15前表面的曲率半径为负，后表面的曲率半径为正，第六透镜16前表面的曲率半径为正，后表面的曲率半径为负，第七透镜17前表面的曲率半径为正，后表面的曲率半径为负。
优选的，第四透镜14、第五透镜15和第六透镜16依次胶合,采用胶合透镜可以降低投影镜头的色差，另外可以降低镜头的组装工艺难度。
本投影镜头在第一透镜组G1和第二透镜组G2之间设置光阑10。
本实施例投影镜头详细的光学数据如表1所示，厚度及半口径的单位为毫米。
表1
  透镜面形 光焦度 厚度 折射率 阿贝数 半口径
第一透镜11 非球面 -0.064 2.825 1.53 5.58 9.19
第二透镜12 球面 -0.081 2.812 1.62 63.4 6.5
第三透镜13 球面 0.08 4 1.83 42.7 5.4
第四透镜14 球面 -0.006 4.6 1.6 65.5 4.36
第五透镜15 球面 -0.028 1.476 1.81 25.5 4.5
第六透镜16 球面 0.038 4 1.79 44.2 5.5
第七透镜17 非球面 0.063 3.1 1.59 61.2 5.5
本投影镜头中第一透镜11和第七透镜17采用非球面设计，非球面的曲线方程式表示如下：
Figure PCTCN2021135212-appb-000001
其中，z表示非球面曲线上的点与光轴的垂直距离，，c表示非球面顶点的曲率，K表示二次曲面系数，A1、A2、A3、A4、A5分别为高阶偶次非球面系数。
第一透镜11和第七透镜17的非球面系数如表2所示，其中面11a和面11b分别表示第一透镜11的前表面和后表面，面17a和面17b分别表示第七透镜17的前表面和后表面。本实施例投影镜头的场曲曲线图、畸变曲线图以及MTF图分别如图7、图8和图9所示，
表2
面 K A 1 A 2 A 3 A 4 A 5
11a -7.195 0 4.038E-004 -6.254E-006 4.195E-08 -1.287E-010
11b -1.159 0 5.778E-004 -3.369E-006 -1.935E-07 9.065E-010
17a -2.663 0 -1.881E-004 1.216E-007 -5.386E-08 -2.788E-09
17b -9.375 0 -1.966E-004 3.081E-006 -1.791E-07 -8.081E-011
表3所示为第一透镜至第七透镜的有效孔径和焦距比值的取值范围。
表3
  有效孔径/焦距的范围
第一透镜11 0.58～0.6
第二透镜12 0.51～0.53
第三透镜13 0.42～0.44
第四透镜14 0.02～0.04
第五透镜15 0.12～0.14
第六透镜16 0.2～0.22
第七透镜17 0.34～0.36
本实施例的投影镜头应用于投影光机，参考图6所示在投影镜头和图像源101之间设置有棱镜105。本实施例的投影镜头只用了7片镜片，应用于投影光机能够实现162％offset的投影效果，增强了用户体验。
以上对本发明所提供的一种投影光机进行了详细介绍。本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。

Claims (10)

  1. 一种投影光机，其特征在于，包括投影镜头和图像源，所述图像源用于向所述投影镜头投射出光线，所述投影镜头的视场角和焦距满足使所述图像源能够位于所述投影镜头的像圆内，所述投影镜头相对于所述图像源的位置满足所述图像源投射到所述投影镜头像圆内的像中心到所述投影镜头光轴的距离，与所述图像源投射到所述投影镜头像圆内的像尺寸一半的比值大于1。
  2. 根据权利要求1所述的投影光机，其特征在于，所述投影镜头相对于所述图像源的位置满足所述图像源投射到所述投影镜头像圆内的像中心到所述投影镜头光轴的距离，与所述图像源投射到所述投影镜头像圆内的像尺寸一半的比值大于等于1.5。
  3. 根据权利要求1所述的投影光机，其特征在于，所述投影镜头相对于所述图像源的位置可改变，使得所述图像源投射到所述投影镜头像圆内的像中心到所述投影镜头光轴的距离可改变。
  4. 根据权利要求3所述的投影光机，其特征在于，通过将所述投影镜头相对于所述图像源移动，改变所述投影镜头相对于所述图像源的位置。
  5. 根据权利要求1-4任一项所述的投影光机，其特征在于，所述投影镜头包括从投影画面侧到图像源侧沿着光轴依次设置的第一透镜组和第二透镜组，所述第一透镜组具有负光焦度，所述第二透镜组具有正光焦度。
  6. 根据权利要求5所述的投影光机，其特征在于，所述第一透镜组包括第一透镜，所述第一透镜到投影画面的距离小于所述第一透镜组中其它任一透镜到投影画面的距离，所述第一透镜的至少一表面为非球面；
    或/和，所述第二透镜组包括第七透镜，所述第七透镜到所述图像源的距离小于所述第二透镜组中其它任一透镜到所述图像源的距离，所述第七透镜的至少一表面为非球面。
  7. 根据权利要求5所述的投影光机，其特征在于，所述第一透镜组包括第一透镜、第二透镜和第三透镜，所述第一透镜前表面的曲率半径为正，后表面的曲率半径为正，所述第二透镜前表面为平面，后表面的曲率半径为正，所述第三透镜前表面的曲率半径为正，后表面的曲率半径为负。
  8. 根据权利要求5所述的投影光机，其特征在于，所述第二透镜组包括 第四透镜、第五透镜、第六透镜和第七透镜，所述第四透镜前表面的曲率半径为正，后表面的曲率半径为负，所述第五透镜前表面的曲率半径为负，后表面的曲率半径为正，所述第六透镜前表面的曲率半径为正，后表面的曲率半径为负，所述第七透镜前表面的曲率半径为正，后表面的曲率半径为负。
  9. 根据权利要求8所述的投影光机，其特征在于，所述第四透镜、所述第五透镜和所述第六透镜依次胶合。
  10. 根据权利要求5所述的投影光机，其特征在于，所述第一透镜组包括第一透镜、第二透镜和第三透镜，依次具有负光焦度、负光焦度和正光焦度；所述第二透镜组包括第四透镜、第五透镜、第六透镜和第七透镜，依次具有负光焦度、负光焦度、正光焦度和正光焦度。
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