CN219456612U - Projection optical system and projection device - Google Patents
Projection optical system and projection device Download PDFInfo
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- CN219456612U CN219456612U CN202223298164.6U CN202223298164U CN219456612U CN 219456612 U CN219456612 U CN 219456612U CN 202223298164 U CN202223298164 U CN 202223298164U CN 219456612 U CN219456612 U CN 219456612U
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Abstract
The utility model discloses a projection optical system and a projection device, which are suitable for a display chip with a large aperture and a large target surface, wherein the projection optical system comprises a plurality of lenses arranged on an optical axis, and the plurality of lenses comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along an object side surface to an image side surface, wherein the focal power of the first lens, the second lens and the fifth lens is negative, the first lens and/or the second lens is a plastic lens, and the focal power of the third lens, the fourth lens, the sixth lens and the seventh lens is positive, so that the cost is greatly reduced compared with the traditional glass spherical lens.
Description
Technical Field
The present utility model relates to the field of optical technologies, and in particular, to a projection optical system and a projection apparatus.
Background
With the development of projection technology, projectors are widely used for convenience and functionality, most of the projectors in home use in the market are miniature projectors, and the used chips are smaller, so that the brightness of the projectors is lower, the use effect is poor under the condition of sufficient illumination, and in order to match the chips with large target surfaces, such as a.47 DMD chip, the used lenses are larger, and the cost is higher.
Therefore, how to reduce the cost on the premise of improving the projection effect by matching a large aperture and large target surface chip becomes a problem to be solved urgently.
Disclosure of Invention
The utility model mainly aims to provide a projection optical system which aims to solve the problem of high cost caused by matching a large aperture and large target surface chip to improve the projection effect.
In order to achieve the above object, the present utility model provides a projection optical system suitable for a display chip with a large aperture and a large target surface, the projection optical system includes a plurality of lenses disposed on an optical axis, the plurality of lenses including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged along an object side surface to an image side surface, wherein:
the focal power of the first lens, the second lens and the fifth lens is negative, and the first lens and/or the second lens is/are plastic lens;
the optical powers of the third lens, the fourth lens, the sixth lens, and the seventh lens are positive.
Optionally, the first, second, third, fourth, and fifth lensesThe focal power of the sixth lens and the seventh lens are phi respectively 1 、φ 2 、φ 3 、φ 4 、φ 5 、φ 6 Phi (phi) 7 Wherein:
0.03<|φ 1 |<0.05, and/or 0.03<|φ 2 |<0.04, and/or 0.04<φ 3 <0.06, and/or-0.003<φ 4 +φ 5 <-0.001, and/or 0.04<φ 6 <0.06, and/or, 0.01<φ 7 <0.03。
Optionally, -0.08<φ 1 +φ 2 <-0.06, and/or 0.04<φ 4 +φ 5 +φ 6 <0.06, and/or 1<|(φ 1 +φ 2 )÷(φ 3 +φ 4 +φ 5 )|<2；
The first lens to the third lens have a total thermal expansion coefficient of T a The thermal expansion coefficient of the sixth lens is T b Of which, 40<|T a |<55、40<|T 6 |<55。
Optionally, a diaphragm is arranged between the third lens and the fourth lens.
Optionally, the third lens, the fourth lens, the fifth lens and the sixth lens are spherical lenses; and/or the number of the groups of groups,
at least one of the first lens, the second lens and the seventh lens is provided as an aspherical lens.
Optionally, a surface shape of at least one of the first lens, the second lens, and the seventh lens satisfies an equation:
wherein c is the curvature corresponding to the radius, y is the radial coordinate, k is the conic coefficient, a 1 To a 8 To represent the coefficients corresponding to the radial coordinates.
Optionally, at least one of the materials of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens comprises glass; and/or the number of the groups of groups,
the fourth lens and the fifth lens are cemented.
Use novel still to propose a projection arrangement, include:
the projection optical system comprises a plurality of lenses arranged on an optical axis, wherein the lenses comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along an object side surface to an image side surface, the focal power of the first lens, the second lens and the fifth lens is negative, the first lens and/or the second lens is/are a plastic lens, and the focal power of the third lens, the fourth lens, the sixth lens and the seventh lens is positive.
And the light emitting chip is arranged opposite to the seventh lens and is used for inputting a light source into the projection optical system.
Optionally, the light emitting chip comprises a 0.47DMD display chip.
Optionally, the light source device further comprises a protective glass and an equivalent prism, wherein the protective glass is arranged between the seventh lens and the light source chip and is adjacent to the light source chip, and the equivalent prism is arranged between the protective glass and the seventh lens.
According to the technical scheme, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from the object side surface to the image side surface, the focal power of the first lens, the second lens and the fifth lens is negative, the focal power of the third lens, the fourth lens, the sixth lens and the seventh lens is positive, and the reasonable arrangement of the focal power is adopted to match an LED illumination light source system or a laser illumination system, so that the projection effect is improved, the high-brightness projection output is realized, and the first lens, the second lens, the first lens and the second lens are all plastic lenses, so that the cost is greatly reduced compared with the traditional glass spherical lens.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a projection optical system according to an embodiment of the present utility model;
FIG. 2 is a normal temperature MTF diagram of the present utility model;
FIG. 3 is a high temperature MTF diagram of the present utility model;
fig. 4 is a graph of field curvature (distortion) of the present utility model.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Projection optical system | 6 | Sixth lens |
| 1 | First lens | 7 | Seventh lens |
| 2 | Second lens | 8 | Diaphragm |
| 3 | Third lens | 9 | Light-emitting chip |
| 4 | Fourth lens | 10 | Protective glass |
| 5 | Fifth lens | 11 | Equivalent prism |
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
With the development of projection technology, projectors are widely used for convenience and functionality, most of the projectors in home use in the market are miniature projectors, and the used chips are smaller, so that the brightness of the projectors is lower, the use effect is poor under the condition of sufficient illumination, and in order to match the chips with large target surfaces, such as a.47 DMD chip, the used lenses are larger, and the cost is higher.
Therefore, how to reduce the cost on the premise of improving the projection effect by matching a large aperture and large target surface chip becomes a problem to be solved urgently.
In order to solve the above-mentioned problems, the present utility model provides a projection optical system, and fig. 1 to 4 are schematic views of an embodiment of the present utility model.
In an embodiment of the present utility model (hereinafter referred to as this embodiment), as shown in fig. 1 to 4, the projection optical system 100 is suitable for a display chip with a large aperture and a large target surface, the projection optical system 100 includes a plurality of lenses disposed on an optical axis, the plurality of lenses includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 sequentially arranged from an object side surface to an image side surface, wherein optical powers of the first lens 1, the second lens 2, and the fifth lens 5 are negative, and the first lens 1 and/or the second lens 2 are plastic lenses, and optical powers of the third lens 3, the fourth lens 4, the sixth lens 6, and the seventh lens 7 are positive.
In the technical scheme of the utility model, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are sequentially arranged from the object side to the image side, the focal power of the first lens 1, the second lens 2 and the fifth lens 5 is negative, the focal power of the third lens 3, the fourth lens 4, the sixth lens 6 and the seventh lens 7 is positive, and the reasonable arrangement of the focal power is adopted to match an LED illumination light source system or a laser illumination system, so that the projection effect is improved, the high-brightness projection output is realized, and the first lens 1 or the second lens 2 or the first lens 1 and the second lens 2 use plastic lenses, compared with the traditional glass spherical lens, the cost is greatly reduced.
Referring to fig. 1, in order to make the optical powers of the first lens element 1, the second lens element 2 and the fifth lens element 5 negative, the object-side surface of the first lens element 1 is convex, the image-side surface of the second lens element 2 is concave, the image-side surface of the second lens element 2 is convex, and the object-side surface of the fifth lens element 5 is concave, the image-side surface of the fifth lens element 5 is convex, so that the first lens element 1, the second projection and the fifth lens element 5 have negative optical powers.
In order to make the third lens element 3, the fourth lens element 4, the sixth lens element 6 and the seventh lens element 7 have positive power, the object-side surface of the third lens element 3 is convex, the image-side surface of the third lens element is convex, the object-side surface of the fourth lens element 4 is flat, the image-side surface of the fourth lens element is convex, the object-side surface of the sixth lens element 6 is convex, the image-side surface of the seventh lens element 7 is convex, and the object-side surface of the seventh lens element 7 is concave, the fourth lens element 4, the sixth lens element 6 and the seventh lens element 7 have positive power.
It should be noted that, the positive focal power means that the connection of the lens and the focus is consistent with the direction of the optical axis, the negative focal power means that the connection of the lens and the focus is opposite to the direction of the optical axis, the object side means that the lens is located at one side of the imaging object, and the image side means that the lens is located at one side of the imaging plane 8.
For focusing between the lenses, the first lens 1 has an optical power of 0.03<|φ 1 |<0.05, or the optical power of the second lens 2 is 0.03<|φ 2 |<0.04, or the third lens 3 has an optical power of 0.04<φ 3 <0.06, or the optical power of the fourth lens 4 and the fifth lens 5 is-0.003<φ 4 +φ 5 <-0.001, or the optical power of the sixth lens 6 is 0.04<φ 6 <0.06, or the focal power of the seventh lens 7 is 0.01<φ 7 <0.03, in order to make the focusing of the projection optical system 100 more accurate, in the present embodiment, the optical power of the first lens 1 is 0.03<|φ 1 |<0.05, and the optical power of the second lens 2 is 0.03<|φ 2 |<0.04, and the third lens 3 has an optical power of 0.04<φ 3 <0.06, and the optical power of the fourth lens 4 and the fifth lens 5 is-0.003<φ 4 +φ 5 <-0.001, and the optical power of the sixth lens 6 is 0.04<φ 6 <0.06, and the focal power of the seventh lens 7 is 0.01<φ 7 <0.03, when the focal power of each lens satisfies the above range, the projection optical system 100 can be focused to perform clear imaging.
In this embodiment, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7 are made of glass materials, and the first lens 1 and the second lens 2 are made of plastic lenses, so that in order to ensure that a projection device can still maintain a brightness output of 2000lm without defocus when a plurality of plastic lenses are used, the optical powers of the lenses further satisfy the following relationships: -0.08<φ 1 +φ 2 <-0.06，0.04<φ 4 +φ 5 +φ 6 <0.06，1<|(φ 1 +φ 2 )÷(φ 3 +φ 4 +φ 5 )|<2, and the first lens 1 to the third lens 3 have a total thermal expansion coefficient T a The thermal expansion coefficient of the sixth lens 6 is T b Wherein the first lens 1 and the second lens 2 are made of plastic lenses, and are greatly affected by temperature, and the temperature MTF curves are shown in FIGS. 2 to 3, when 40 is satisfied<|T a |<55、40<|T b |<55, the sixth lens 6 may compensate for the chromatic aberration effects of the first lens 1 and the second lens 2 due to temperature.
And a diaphragm 8 is arranged between the third lens 3 and the fourth lens 4 and is used for limiting the imaging range and ensuring the imaging precision.
In this embodiment, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are spherical lenses, the first lens 1, the second lens 2 and the seventh lens 7 are all aspheric lenses, in combination with fig. 1 and fig. 4, the two sides of the first lens 1 are bent towards the light emitting chip 9, the angle of light entering the rear group is reduced, the distortion of large angle is corrected, the two sides of the second lens 2 are bent towards the projection plane, the pupil can be increased, the high line of the rear group is increased, the third lens 3 further increases the height of light entering the rear group, so that the system has a larger aperture, the fourth lens 4 and the fifth lens 5 are cemented lenses, the chromatic aberration of the system is corrected, the sixth lens 6 is spherical lens, the residual chromatic aberration of the system is corrected by using low dispersion glass, the light height of the large field is increased, the seventh lens 7 adopts glass aspheric surface, the distortion of the system is further corrected, and the residual aberration of the system is converged, so that the high resolution of the target image is obtained at the same time.
In the present embodiment, the surface shapes of the first lens 1, the second lens 2, and the seventh lens 7 all satisfy the equation:wherein c is the curvature corresponding to the radius, y is the radial coordinate, k is the conic coefficient, a 1 To a 8 For respectively representing the corresponding coefficients of the radial coordinates, when the k coefficient is smaller than-1, the surface shape curve of the lens is a hyperbola, and when the k coefficient is equal to-1, the surface shape curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface shape curve of the lens isElliptic, when the k coefficient is equal to 0, the surface shape curve of the lens is circular, when the k coefficient is greater than 0, the surface shape curve of the lens is oblate, the aperture of F1.7 is matched with the 0.47DMD chip, and the actual design parameters of each lens with the brightness of 2000lm are output:
wherein S1 represents a side surface of the first lens 1 facing the object plane (object side surface), S2 represents a side surface of the first lens 1 facing the image plane (image side surface), S3 represents a side surface of the second lens 2 facing the object plane, and so on;
coefficients in the exterior shape equation of S1: k= -0.9167183, a 1 ＝0、a 2 ＝-1.4075003e-005、a 3 ＝-8.7018232e-008、a 4 ＝3.4955574e-010、a 5 ＝-6.3558396e-013、a 6 ＝5.1774046e-016、a 7 ＝0、a 8 ＝0；
Coefficients in the exterior shape equation of S2: k= -1.015285, a 1 ＝0、a 2 ＝5.0390516e-005、a 3 ＝-6.2400985e-007、a 4 ＝5.6145387e-009、a 5 ＝-2.7703842e-011、a 6 ＝0、a 7 ＝0、a 8 ＝0；
The coefficients in the exterior shape equation for S3 are: k= -0.9567155, a 1 ＝0、a 2 ＝9.6881417e-005、a 3 ＝2.7381682e-009、a 4 ＝-8.1738321e-010、a 5 ＝2.3580278e-012、a 6 ＝0、a 7 ＝0、a 8 ＝0；
The coefficients in the exterior shape equation for S4 are: k= -5.819031, a 1 ＝0、a 2 ＝3.0187473e-005、a 3 ＝1.6778072e-007、a 4 ＝-7.8376391e-010、a 5 ＝1.5196676e-012、a 6 ＝0、a 7 ＝0、a 8 ＝0；
The coefficients in the exterior shape equation for S13 are: k= 95.00132, a 1 ＝0、a 2 ＝-2.9716866e-005、a 3 ＝-3.514958e-008、a 4 ＝1.9476199e-010、a 5 ＝-1.4609706e-013、a 6 ＝-8.6610928e-015、a 7 ＝0、a 8 ＝0；
The coefficients in the exterior shape equation of S14 are: k= -11.37526, a 1 ＝0、a 2 ＝-2.5329607e-005、a 3 ＝6.7107779e-008、a 4 ＝5.6369781e-011、a 5 ＝-1.3970733e-013、a 6 ＝-6.700999e-015、a 7 ＝0、a 8 ＝0；
Combination formulaThe relative shapes of the first lens 1, the second lens 2 and the seventh lens 7 can be obtained.
The present utility model further provides a projection device, which includes a light emitting chip 9 and the projection optical system 100, where the light emitting chip 9 is disposed opposite to the seventh lens 7, i.e. is located at the image side, and the specific structure of the projection optical system 100 refers to the foregoing embodiments.
The projection device further comprises a protective glass 10 and an equivalent prism 11, wherein the protective glass 10 is arranged between the first lens 1 and the light-emitting chip 9 and is adjacent to the light-emitting chip 9 and used for protecting the light-emitting chip 9, and the equivalent prism 11 is arranged between the protective glass 10 and the seventh lens 7 and used for equivalently transmitting light.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.
Claims (8)
1. The utility model provides a projection optical system, is applicable to the display chip of big target surface of large aperture, its characterized in that, projection optical system includes a plurality of lenses that set up on the optical axis, a plurality of lens include along the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens that object side to image side arrange in proper order, wherein:
the focal power of the first lens, the second lens and the fifth lens is negative, and the first lens and/or the second lens is/are plastic lens;
the focal power of the third lens, the fourth lens, the sixth lens and the seventh lens is positive;
the optical powers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are phi respectively 1 、φ 2 、φ 3 、φ 4 、φ 5 、φ 6 Phi (phi) 7 Wherein:
0.03<|φ 1 |<0.05, and/or 0.03<|φ 2 |<0.04, and/or 0.04<φ 3 <0.06, and/or-0.003<φ 4 +φ 5 <-0.001, and/or 0.04<φ 6 <0.06, and/or, 0.01<φ 7 <0.03；
-0.08<φ 1 +φ 2 <-0.06, and/or 0.04<φ 4 +φ 5 +φ 6 <0.06, and/or 1<|(φ 1 +φ 2 )÷(φ 3 +φ 4 +φ 5 )|<2；
The first lens to the third lens have a total thermal expansion coefficient of T a The thermal expansion coefficient of the sixth lens is T b Of which, 40<|T a |<55、40<|T 6 |<55。
2. The projection optical system according to claim 1, wherein a diaphragm is provided between the third lens and the fourth lens.
3. The projection optical system according to claim 1, wherein the third lens, the fourth lens, the fifth lens, and the sixth lens are spherical lenses; and/or the number of the groups of groups,
at least one of the first lens, the second lens and the seventh lens is provided as an aspherical lens.
4. The projection optical system according to claim 3, wherein a surface shape of at least one of the first lens, the second lens, and the seventh lens satisfies an equation:
wherein c is the curvature corresponding to the radius, y is the radial coordinate, k is the conic coefficient, a 1 To a 8 To represent the coefficients corresponding to the radial coordinates.
5. The projection optical system according to claim 1, wherein a material of at least one of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens comprises glass; and/or the number of the groups of groups,
the fourth lens and the fifth lens are cemented.
6. A projection apparatus, comprising:
projection optical system comprising the projection optical system according to any one of claims 1 to 5; the method comprises the steps of,
and the light emitting chip is arranged opposite to the seventh lens and is used for inputting a light source into the projection optical system.
7. The projection device of claim 6, wherein the light emitting chip comprises a 0.47DMD display chip.
8. The projection device of claim 7, further comprising a cover glass disposed between the seventh lens and the light emitting chip and disposed adjacent to the light emitting chip, and an equivalent prism disposed between the cover glass and the seventh lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223298164.6U CN219456612U (en) | 2022-12-08 | 2022-12-08 | Projection optical system and projection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223298164.6U CN219456612U (en) | 2022-12-08 | 2022-12-08 | Projection optical system and projection device |
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| CN219456612U true CN219456612U (en) | 2023-08-01 |
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| CN202223298164.6U Active CN219456612U (en) | 2022-12-08 | 2022-12-08 | Projection optical system and projection device |
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