CN111897116B - Projection optical system and projection apparatus - Google Patents
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- CN111897116B CN111897116B CN202010860161.3A CN202010860161A CN111897116B CN 111897116 B CN111897116 B CN 111897116B CN 202010860161 A CN202010860161 A CN 202010860161A CN 111897116 B CN111897116 B CN 111897116B
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention provides a projection optical system. The projection optical system sequentially comprises a display unit, a third lens group, a second lens group and a first lens group along the light transmission direction, wherein the first lens group has negative focal power, the second lens group has positive focal power, and the third lens group has positive focal power; the projection optical system further comprises a moving component which is respectively connected with the first lens group, the second lens group and the third lens group so as to drive the first lens group, the second lens group and the third lens group to move together, so that the image plane position of the projection optical system in the zooming process is not moved, repeated focusing is not needed under the same projection distance, and the picture is still clear. According to the technical scheme, the focal power of the projection optical system is reasonably distributed, the total length of the projection optical system is reduced, and the first lens group, the second lens group and the third lens group are arranged in a linkage mode, so that the effect of keeping a clear picture in the zooming process is achieved.
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to a projection optical system and a projection apparatus.
Background
The projection device can project pictures with different sizes in a fixed space, and the flexibility and convenience of the projection device enable the projection device to be used in different occasions. The display unit and the optical system are core components in the projection equipment, most of the projection lenses on the market at present are designed in a mode of combining a plurality of lens groups, the number of the lens groups is usually more than 4, and when the required zoom ratio of the projection equipment is large, the number of the lens groups is usually more than 7, so that the assembly and assembly difficulty of the projection equipment are seriously increased.
Disclosure of Invention
The invention mainly aims to provide a projection optical system, which aims to solve the problems of large number of lens groups in the optical system of projection equipment and large assembly difficulty of the projection equipment.
In order to achieve the above objective, the present invention provides a projection optical system, which sequentially includes a display unit, a third lens group, a second lens group and a first lens group along a light transmission direction, wherein each of the first lens group, the second lens group and the third lens group includes at least one lens;
the first lens group, the second lens group and the third lens group can mutually move along the light transmission direction;
The first lens group has negative focal power, the second lens group has positive focal power, and the third lens group has positive focal power;
The projection optical system further comprises a moving component, wherein the moving component is respectively connected with the first lens group, the second lens group and the third lens group so as to drive the first lens group, the second lens group and the third lens group to move together.
Preferably, the projection optical system satisfies the following relationship:
Wherein,
The saidRepresenting the optical power of the first lens group, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the second lens group, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the third lens group, theRepresenting the saidIs the absolute value of (c).
Preferably, the lenses of the first lens group, the second lens group and the third lens group are all made of optical glass.
Preferably, the first lens group sequentially comprises a fourth lens, a third lens, a second lens and a first lens along the light transmission direction;
the second lens group sequentially comprises a seventh lens, a sixth lens and a fifth lens along the light transmission direction;
The third lens group sequentially comprises a fourteenth lens, a thirteenth lens, a twelfth lens, an eleventh lens, a tenth lens, a ninth lens and an eighth lens along the light transmission direction.
Preferably, the first lens has negative optical power; the second lens has negative optical power;
The third lens has negative focal power; the fourth lens has positive focal power;
the fifth lens has positive optical power; the sixth lens has negative focal power;
the seventh lens has positive optical power; the eighth lens has negative focal power;
the ninth lens has positive optical power; the tenth lens has negative optical power;
the eleventh lens has positive optical power; the twelfth lens has negative focal power;
The thirteenth lens has positive optical power; the fourteenth lens has positive optical power.
Preferably, the projection optical system satisfies the following relationship:
Wherein,
The saidRepresenting the optical power of the first lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the second lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the third lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the fourth lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the fifth lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the sixth lens and the seventh lens after being glued, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the eighth lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the ninth lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the tenth lens after bonding with the eleventh lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the twelfth lens after bonding with the thirteenth lens, theRepresenting the saidAbsolute value of (2);
The said Representing the optical power of the fourteenth lens, theRepresenting the saidIs the absolute value of (c).
Preferably, the projection optical system satisfies:
75< VD 3 <95, the representation VD 3 representing an abbe number of the third lens;
1.80< ND 5 <1.81, the ND 5 representing the refractive index of the fifth lens;
1.0< ND 7/ND6 <1.03, the ND 7 representing the refractive index of the seventh lens, and the ND 6 representing the refractive index of the sixth lens.
Preferably, the projection optical system further includes a turning prism, and the turning prism is disposed between the second lens group and the display unit at intervals.
Preferably, the projection optical system further includes a diaphragm, and the diaphragm is disposed between the first lens group and the second lens group.
The application also provides a projection device, which comprises a shell and the projection optical system according to any embodiment, wherein the projection optical system is accommodated in the shell.
According to the technical scheme, the optical powers of the first lens group, the second lens group and the third lens group of the projection optical system are reasonably distributed, so that the number of the movable lens groups is small, and the technical problems that most of projection lenses are large in size and the number of groups is large are solved. The projection optical system of the technical scheme of the invention comprises: the light beam imaging device comprises a display unit, a third lens group, a second lens group and a first lens group in sequence along the light beam transmission direction, wherein light rays emitted by the display unit sequentially pass through the third lens group, the second lens group and the first lens group and then are imaged on an imaging surface. The projection optical system further comprises a moving component, wherein the moving component is connected with the first lens group, the second lens group and the third lens group and drives the first lens group, the second lens group and the third lens group to move together. The first lens group has negative focal power, the second lens group has positive focal power, the third lens group has positive focal power, a linkage combination is formed among the first lens group, the second lens group and the third lens group, and the first lens group, the second lens group and the third lens group are moved relative to the display unit, so that the image plane position in the zooming process is not moved, the focusing is not needed in the zooming process under the same projection distance, and the picture is still clear.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, 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 invention;
FIG. 2 is a graph of modulation transfer function of an embodiment of a projection optical system according to the present invention;
FIG. 3 is a vertical axis color difference chart of an embodiment of a projection optical system according to the present invention;
FIG. 4 is a lateral color chart of an embodiment of a projection optical system according to the present invention;
fig. 5 is a diagram showing field curvature distortion of an embodiment of a projection optical system according to the present invention.
Reference numerals illustrate:
| Reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | First lens group | 200 | Second lens group |
| 300 | Third lens group | 500 | Display unit |
| 400 | Steering prism | 15 | Diaphragm |
| 1 | First lens | 2 | Second lens |
| 3 | Third lens | 4 | Fourth lens |
| 5 | Fifth lens | 6 | Sixth lens |
| 7 | Seventh lens | 8 | Eighth lens |
| 9 | Ninth lens | 10 | Tenth lens |
| 11 | Eleventh lens | 12 | Twelfth lens |
| 13 | Thirteenth lens | 14 | Fourteenth lens |
The achievement of the objects, functional features and advantages of the present invention 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 invention 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 invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention 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 invention.
The present invention proposes a projection optical system, as shown in fig. 1, which sequentially includes a display unit 500, a third lens group 300, a second lens group 200, and a first lens group 100 along a light transmission direction; the first lens group 100, the second lens group 200 and the third lens group 300 each include at least one lens; the first lens group 100, the second lens group 200 and the third lens group 300 can move along the light transmission direction; specifically, the projection optical system further includes a moving component (not shown in the drawing), where the moving component is connected to the first lens group 100, the second lens group 200 and the third lens group 300, and drives the first lens group 100, the second lens group 200 and the third lens group 300 to move together, where the first lens group 100, the second lens group 200 and the third lens group 300 are disposed in linkage and move in the same direction, and in a specific embodiment, when the first lens group 100 moves to a side close to the display unit 500, the second lens group 200 and the third lens group 300 move together to a side close to the display unit 500, and in a specific embodiment, when the first lens group 100 moves to a side close to the display unit 500 by 0.5mm, the second lens group 200 moves to a side close to the display unit 500 by 1mm, and the third lens group 300 moves to a side close to the display unit 500 by 0.8mm, so that a clear focusing process is still not required to be repeated in the same projection distance.
It can be understood that the first lens group 100, the second lens group 200 and the third lens group 300 may also be disposed independently, and are respectively connected with the moving assembly, so that when the optical system needs to be subjected to the magnification changing process, positions of the first lens group 100, the second lens group 200 and the third lens group 300 can be respectively adjusted to change the imaging effect of the projection optical system.
It will be appreciated that the moving assembly includes an operating portion disposed on the housing of the projection apparatus when the projection optical system is applied to the projection apparatus, the operating portion being configured to facilitate a user in adjusting the relative positions of the first lens group 100, the second lens group 200, and the third lens group 300.
In addition, the first lens group 100 has negative optical power, the second lens group 200 has positive optical power, and the third lens group 300 has positive optical power.
In the technical scheme of the invention, the zoom ratio is the ratio of the maximum focal length to the minimum focal length of the projection optical system of the technical scheme; the projection ratio is the ratio of the distance from the projector to the screen to the size of the projection picture; optical power characterizes the ability of an optical system to deflect light, for optical powerThe representation is made of a combination of a first and a second color,The larger the number of (c) is, the greater the degree of parallel beam deflection,When the refractive index is high, the refractive index is convergent,When the refraction is divergent; the Abbe number is used for indicating the index of the dispersion capability of the transparent medium, and the larger the refractive index of the medium is, the more serious the dispersion is, and the smaller the Abbe number is; conversely, the smaller the refractive index of the medium, the more slight the dispersion and the greater the Abbe number; the optical adhesive is a special adhesive for cementing transparent optical elements such as lenses and the like; a diaphragm refers to an entity in an optical system that acts to limit a light beam in two ways, limiting the light beam or limiting the field of view, i.e. the size of the imaging range.
In this embodiment, the display unit 500, the third lens group 300, the second lens group 200 and the first lens group 100 are sequentially arranged along the light transmission direction, the light emitted by the display unit 500 sequentially passes through the third lens group 300, the second lens group 200 and the first lens group 100 and then forms an image on the imaging plane, the first lens group 100, the second lens group 200 and the third lens group 300 each include at least one lens, when the first lens group 100 includes a plurality of lenses, the relative positions of the plurality of lenses are fixed, when the second lens group 200 includes a plurality of lenses, the relative positions of the plurality of lenses are fixed, and when the third lens group 300 includes a plurality of lenses; the plurality of lenses in the first lens group 100, the second lens group 200 and the plurality of lenses in the third lens group 300 can all move integrally along the light transmission direction, and the first lens group 100, the second lens group 200 and the third lens group 300 can be relatively close to or far from the display unit 500; when the projection optical system of the invention zooms from 1 time to 1.6 times, the zoom movement interval range between the lens groups is as follows: the interval between the first lens group 100 and the second lens group 200 is 0.66-2.72 mm, and the interval between the second lens group 200 and the third lens group is 11.39-12.00 mm. The first lens group 100, the second lens group 200 and the third lens group 300 form a linkage combination, and move together relative to the display unit 500, so that the image plane position in the zooming process is not moved, and the situation that focusing is not needed in the zooming process and the picture is still clear under the same projection distance is realized. According to the technical scheme, the third lens group 300, the second lens group 200 and the first lens group 100 of the projection optical system are reasonably matched, so that the number of the movable lens groups is reduced, the smaller total length is realized, the assembly yield is improved, and mass production can be performed.
It will be appreciated that the display unit 500 is a display chip 500, and that the present invention preferably employs a digital micromirror element (Digital Micromirror Device, DMD) chip that may be offset from the optical axis by 100% -110%. It is understood that in other embodiments, the display unit 500 may also be a Liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), an organic light-Emitting Diode (OLED), a Liquid CRYSTAL DISPLAY, LCD, a light Emitting Diode (LIGHT EMITTING Diode, LED), or the like.
Preferably, the projection optical system satisfies the following relationship: Wherein the said Representing the optical power of the first lens group 100, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the second lens group 200, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the third lens group 300, theRepresenting the saidIs the absolute value of (c).
In the present embodiment, the third lens group 300 has positive optical power along the light transmission direction, i.e. satisfies the following requirementsThe light rays can be concentrated in a meandering manner through the third lens group 300, and the second lens group 200 has positive optical power, i.e. satisfiesThe light rays can be concentrated in a meandering manner through the second lens group 200, and the first lens group 100 has negative focal power, i.e. satisfiesThe first lens group 100 can make the light ray zigzag and divergent. The third lens group 300, the second lens group 200 and the first lens group 100 are arranged according to the optical power parameter, so that a variable power ratio of more than 1.6 times can be realized by using fewer groups, and meanwhile, the projection ratio value of the optical system is smaller than 1.2.
Preferably, the lenses of the first lens group 100, the second lens group 200 and the third lens group 300 are all made of optical glass.
In this embodiment, each lens in the first lens group 100, the second lens group 200 and the third lens group 300 of the projection optical system is a full glass lens. At present, the projector lens is mainly divided into two types: glass lens and resin lens. Because the strength of the resin material is not high and the chemical characteristics are unstable, the resin material is easily affected by temperature, so that the phenomena of coke running, deficient coke and the like of the picture occur; for the picture, the color rendition is inferior to that of the glass lens. The anti-observation glass lens has high hardness and wear resistance, and secondly, compared with a resin lens, the glass lens has a general refractive index higher than that of the resin lens, and the color reduction degree of the projected picture is high; in terms of chemical property expression, the glass lens is more stable, coke running caused by thermal expansion and cold contraction is avoided, corrosion is also more resistant, and the service life of the lens is prolonged; therefore, the adoption of the full glass lens well avoids the phenomena of thermal deformation, virtual focus and the like caused by heating of the resin aspheric lens, and the glass lens also has the advantages of difficult deformation, good picture resolution and better permeability.
Preferably, the first lens group 100 includes a fourth lens 4, a third lens 3, a second lens 2, and a first lens 1 in order along the light transmission direction; the second lens group 200 sequentially comprises a seventh lens 7, a sixth lens 6 and a fifth lens 5 along the light transmission direction; the third lens group 300 includes, in order along the light transmission direction, a fourteenth lens 14, a thirteenth lens 13, a twelfth lens 12, an eleventh lens 11, a tenth lens 10, a ninth lens 9, and an eighth lens 8.
In this embodiment, the projection optical system is provided with three lens groups along the light transmission path, which are the third lens group 300, the second lens group 200 and the first lens group 100 in sequence. Wherein the twelfth lens 12 is glued with the thirteenth lens 13, the tenth lens 10 is glued with the eleventh lens 11, and the sixth lens 6 is glued with the seventh lens 7, wherein the gluing of the twelfth lens 12 with the thirteenth lens 13, the tenth lens 10 with the eleventh lens 11, and the sixth lens 6 with the seventh lens 7 is done by gluing.
It is understood that the glue used for bonding may be at least one of an optical glue (Optically CLEAR ADHESIVE, OCA), a liquid optical glue (Liquid Optically CLEAR ADHESIVE, LOCA), an ultraviolet curable glue, a polyurethane glue.
In a preferred embodiment, the first lens 1 has negative optical power; the second lens 2 has negative optical power; the third lens 3 has negative optical power; the fourth lens 4 has positive optical power; the fifth lens 5 has positive optical power; the sixth lens 6 has negative optical power; the seventh lens 7 has positive optical power; the eighth lens 8 has negative optical power; the ninth lens 9 has positive optical power; the tenth lens 10 has negative optical power; the eleventh lens 11 has positive optical power; the twelfth lens 12 has negative optical power; the thirteenth lens 13 has positive optical power; the fourteenth lens 14 has positive optical power.
In this embodiment, in the first lens group 100, the first lens 1 has negative focal power, both sides of the first lens are concave toward the display unit 500, and the first lens 1 can diverge light; the focal power of the second lens 2 is negative, the second lens 2 is a glass aspheric lens, both sides of the second lens are concave to the display unit 500, and the second lens 2 can diverge light rays; the third lens 3 has negative focal power, both sides of the third lens are convex towards the display unit 500, and the third lens 3 can diverge light rays; the fourth lens 4 has positive optical power, and the fourth lens 4 can focus light.
In the second lens group 200, the focal power of the fifth lens 5 is positive, the fifth lens 5 has a glass aspheric structure, one surface of the fifth lens 5 protrudes towards the display unit 500, the other surface of the fifth lens protrudes towards the fourth lens 4, and the fifth lens 5 can collect light rays; the sixth lens 6 is cemented with the seventh lens 7, and specifically, a side surface of the sixth lens 6 close to the display unit 500 is cemented with a side surface of the seventh lens 7 distant from the display unit 500.
In the third lens group 300, the focal power of the eighth lens 8 is negative, both sides of the eighth lens 8 are convex towards the display unit 500, the eighth lens 8 can diverge light rays, so that the incident angle of the light rays entering the rear lens (the ninth lens 9) can be reduced, and the manufacturing sensitivity of the system is reduced; the focal power of the ninth lens 9 is positive, the ninth lens 9 is a biconvex lens, and the ninth lens 9 can collect light rays; the optical power of the cemented lens combining the tenth lens 10 and the eleventh lens 11 is negative, and the cemented lens combining the tenth lens 10 and the eleventh lens 11 can diverge light rays; the optical power of the bonding lens combined by the twelfth lens 12 and the thirteenth lens 13 is negative, and the bonding lens combined by the twelfth lens 12 and the thirteenth lens 13 can diverge light rays; the optical power of the fourteenth lens 14 is positive, the fourteenth lens 14 is a glass aspherical surface, and the fourteenth lens 14 can collect light. When the lenses of the third lens group 300 are distributed according to the optical power, the residual spherical aberration, distortion and other aberration of the front group can be corrected, high resolution and high illumination can be realized, the assembly difficulty of the rear group lenses can be reduced, the assembly yield can be improved, and batch production can be realized.
Preferably, the projection optical system satisfies the following relationship: Wherein the said Representing the optical power of the first lens 1, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the second lens 2, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the third lens 3, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the fourth lens 4, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the fifth lens 5, theRepresenting the saidAbsolute value of (2); the saidRepresents the optical power of the sixth lens 6 and the seventh lens 7 after being glued, the followingRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the eighth lens 8, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the ninth lens 9, theRepresenting the saidAbsolute value of (2); the saidRepresents the optical power of the tenth lens 10 after being cemented with the eleventh lens 11, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the twelfth lens 12 after being cemented with the thirteenth lens 13, theRepresenting the saidAbsolute value of (2); the saidRepresenting the optical power of the fourteenth lens 14, theRepresenting the saidIs the absolute value of (c).
Preferably, the projection optical system satisfies: 75< VD 3 <95, the representation VD 3 representing an abbe number of the third lens 3; 1.80< ND 5 <1.81, the ND 5 representing the refractive index of the fifth lens 5; 1.0< ND 7/ND6 <1.03, the ND 7 representing the refractive index of the seventh lens 7, and the ND 6 representing the refractive index of the sixth lens 6.
Preferably, the projection optical system further includes a diaphragm 15, and the diaphragm 15 is disposed between the first lens group 100 and the second lens group.
In the embodiment, the Abbe number of the third lens 3 satisfies 75< VD 3 <95, can correct the chromatic aberration of magnification of a large view field, can reduce the incidence angle of light rays entering the rear group lens and reduces the assembly sensitivity of the lens; the fifth lens 5 satisfies the refractive index: 1.80< ND5<1.81, the spherical aberration of the diaphragm 15 and the coma aberration of the diaphragm 15 with different multiplying powers can be corrected, and the aperture value is smaller than 1.5; the sixth lens 6 and the seventh lens 7 are cemented lenses, and the optical power satisfies: 1.0< ND7/ND6<1.03, can reduce the spherical aberration entering the subsequent optical lens.
In a specific embodiment, the diaphragm 15 is disposed between the first lens group 100 and the second lens group, specifically, between the fourth lens group 4 and the fifth lens group 5, and the first lens group 100 and the second lens group 200 move in the same direction relative to the diaphragm 15, that is, when the fourth lens group 4 approaches the diaphragm 15 along the optical axis direction of the optical system, the fifth lens group 5 is far away from the diaphragm 15 along the optical axis direction of the optical system. In the magnification varying process of the projection optical system of the present invention, the distance between the diaphragm 15 and the display unit 500 is kept unchanged, and the aperture value is changed by adjusting the positions of the first lens group 100 and the second lens group 200.
Preferably, the projection optical system further includes a turning prism 400, and the turning prism 400 is disposed between the second lens group and the display unit 500.
In one embodiment of the present invention, please refer to table 1 for actual design parameters of the zoom projection lens when the projection ratio and the zoom ratio are 1.6 times:
TABLE 1
Wherein each lens has two surfaces, in the above table, S1 and S2 are surface parameter numbers of a first surface and a second surface of the first lens 1, S3 and S4 are surface parameter numbers of a first surface and a second surface of the second lens 2, S5 and S6 are surface parameter numbers of a first surface and a second surface of the third lens 3, S7 and S8 are surface parameter numbers of a first surface and a second surface of the fourth lens 4, STO is a surface parameter number of the diaphragm 15, S10 and S11 are surface parameter numbers of a first surface and a second surface of the fifth lens 5, S12, S13 and S14 are surface parameter numbers of a first surface, a second surface and a third surface of the cemented lens 6 after the sixth lens is cemented with the seventh lens, S15 and S16 are surface parameter numbers of a first surface and a second surface of the eighth lens 8, S17 and S18 are surface parameter numbers of a first surface and a second surface of the ninth lens 9, S19, S20 and S21 are surface parameter numbers of a third surface after the tenth lens is cemented with the eleventh lens, S10 and S14 are surface parameter numbers of a second surface of the fourth lens, S22 and S24 and S28 and a second surface of the fourth lens is a thirteenth surface of the cemented with the fourth lens, S14 and S28 and S14 are surface parameter numbers of the fourth lens after the fourth lens is cemented with the fourth surface parameter numbers of the fourth surface of the fourth lens is cemented with the fourth surface parameter number of the fourth surface.
In the present embodiment of the present invention, the second lens 2, the fifth lens 5, and the fourteenth lens 14 are glass aspherical lenses, and the aspherical surface shapes of the second lens 2, the fifth lens 5, and the fourteenth lens 14 satisfy the following equations:
In the formula, the parameter c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic coefficient; 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 is elliptical, 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, and a 1 to a 8 respectively represent the coefficients corresponding to the radial coordinates.
The coefficients of the first surface and the second surface of each of the second lens 2, the fifth lens 5, and the fourteenth lens 14 are shown in table 2 below:
TABLE 2
The invention also provides a projection device, which comprises a shell and the projection optical system in any embodiment, wherein the projection optical system is accommodated in the shell of the projection equipment, the specific structure of the projection optical system refers to the embodiment, and the projection optical system adopts all the technical schemes of all the embodiments, so that the projection optical system has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted.
Referring to fig. 2, fig. 2 is a diagram of a modulation transfer function according to a first embodiment, wherein a modulation transfer function (Modulation Transfer Function, MTF) refers to a relationship between a modulation degree and a line pair per millimeter in an image, and is used for evaluating a scene detail reduction capability. The higher the value of the vertical axis of the modulation transfer function, the higher the imaging resolution. In a first embodiment, the MTF values of the optical system in the respective fields of view are each 0.5 or more.
Referring to fig. 3, fig. 3 is an axial spherical aberration diagram of a first embodiment, in which, after passing through an optical system, a concentric beam emitted from an on-axis point is no longer a concentric beam, and light rays with different incident heights intersect at different positions, and have different degrees of deviation from an off-axis image point, which is called axial spherical aberration, for evaluating the imaging quality of an on-axis object point.
Referring to fig. 4, fig. 4 is a vertical axis chromatic aberration chart of the first embodiment, wherein the vertical axis chromatic aberration is also called chromatic aberration of magnification, and mainly refers to a multi-color principal ray of an object side, which is changed into a plurality of rays when exiting from an image side due to chromatic dispersion of a refraction system, and is the difference of focal positions of hydrogen blue light and hydrogen red light on an image plane; in the first embodiment, the maximum dispersion of the optical system is the maximum position of the field of view of the optical system, and the maximum chromatic aberration value of the optical system is less than 2.9 μm.
Referring to fig. 5, fig. 5 is a field curvature and an optical distortion chart of the first embodiment, wherein the field curvature is used to represent the position change of the beam image point at different field points away from the image plane, and the optical distortion refers to the vertical axis distance between the principal ray at the dominant wavelength of a certain field and the image plane point away from the ideal image point; in the first embodiment, the field curvature at the tangential plane and the sagittal plane is less than + -0.25 mm, and the maximum distortion is < 1%.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (9)
1. The projection optical system is characterized in that only three lens groups with optical power are arranged on a light transmission path of the projection optical system, namely a third lens group, a second lens group and a first lens group in sequence, wherein the first lens group, the second lens group and the third lens group at least comprise one lens, and the lenses are all glass lenses;
The first lens group has negative focal power, the second lens group has positive focal power, and the third lens group has positive focal power;
The projection optical system further comprises a display unit, a third lens group, a second lens group and a moving assembly, wherein the display unit, the third lens group, the second lens group and the first lens group are sequentially arranged along the light transmission direction, and the moving assembly is respectively connected with the first lens group, the second lens group and the third lens group so as to drive the first lens group, the second lens group and the third lens group to jointly move;
the projection optical system satisfies the following relationship:
0.02<|φ100|<0.04,0.01<|φ200|<0.03,0.02<|φ300|<0.04；
Wherein,
The phi 100 represents the optical power of the first lens group, and the |phi 100 | represents the absolute value of the phi 100;
The phi 200 represents the optical power of the second lens group, and the |phi 200 | represents the absolute value of the phi 200;
The phi 300 represents the optical power of the third lens group, and the |phi 300 | represents the absolute value of the phi 300.
2. The projection optical system according to claim 1, wherein the lenses of the first lens group, the second lens group and the third lens group are all made of optical glass.
3. The projection optical system according to claim 1, wherein the first lens group includes, in order in a light transmission direction, a fourth lens, a third lens, a second lens, and a first lens;
the second lens group sequentially comprises a seventh lens, a sixth lens and a fifth lens along the light transmission direction;
The third lens group sequentially comprises a fourteenth lens, a thirteenth lens, a twelfth lens, an eleventh lens, a tenth lens, a ninth lens and an eighth lens along the light transmission direction.
4. The projection optical system according to claim 3, wherein,
The first lens has negative optical power; the second lens has negative optical power;
The third lens has negative focal power; the fourth lens has positive focal power;
the fifth lens has positive optical power; the sixth lens has negative focal power;
the seventh lens has positive optical power; the eighth lens has negative focal power;
the ninth lens has positive optical power; the tenth lens has negative optical power;
the eleventh lens has positive optical power; the twelfth lens has negative focal power;
The thirteenth lens has positive optical power; the fourteenth lens has positive optical power.
5. The projection optical system according to claim 3, wherein the projection optical system satisfies the following relationship:
0.01<|φ1|<0.05,0.01<|φ2|<0.03,0.01<|φ3|<0.05,0.01<|φ4|<0.04,
0.02<|φ5|<0.04,0.01<|φ6|<0.02,0.01<|φ8|<0.02,0.025<|φ9|<0.035,
0.003<|φ10|<0.01,0.005<|φ12|<0.015,0.02<|φ14|<0.03；
Wherein,
The phi 1 represents the optical power of the first lens, the |phi 1 | represents the absolute value of the phi 1;
The phi 2 represents the optical power of the second lens, and the |phi 2 | represents the absolute value of the phi 2;
The phi 3 represents the optical power of the third lens, and the |phi 3 | represents the absolute value of the phi 3;
The phi 4 represents the optical power of the fourth lens, and the |phi 4 | represents the absolute value of the phi 4;
The phi 5 represents the optical power of the fifth lens, and the |phi 5 | represents the absolute value of the phi 5;
the phi 6 represents the optical power of the sixth lens after bonding with the seventh lens, and the |phi 6 | represents the absolute value of the phi 6;
The phi 8 represents the optical power of the eighth lens, and the |phi 8 | represents the absolute value of the phi 8;
The phi 9 represents the optical power of the ninth lens, and the |phi 9 | represents the absolute value of the phi 9;
The phi 10 represents the optical power of the tenth lens after bonding with the eleventh lens, and the |phi 10 | represents the absolute value of the phi 10;
The phi 12 represents the optical power of the twelfth lens after bonding with the thirteenth lens, and the |phi 12 | represents the absolute value of the phi 12;
The phi 14 represents the optical power of the fourteenth lens, and the |phi 14 | represents the absolute value of the phi 14.
6. The projection optical system of claim 3, wherein the projection optical system satisfies:
75< VD 3 <95, the representation VD 3 representing an abbe number of the third lens;
1.80< ND 5 <1.81, the ND 5 representing the refractive index of the fifth lens;
1.0< ND 7/ND6 <1.03, the ND 7 representing the refractive index of the seventh lens, and the ND 6 representing the refractive index of the sixth lens.
7. The projection optical system of claim 1, further comprising a turning prism disposed in spaced relation between the second lens group and the display unit.
8. The projection optical system of claim 1, further comprising a diaphragm disposed between the first lens group and the second lens group.
9. A projection apparatus comprising a housing and the projection optical system according to any one of claims 1 to 8, the projection optical system being housed in the housing.
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| CN204129321U (en) * | 2012-04-02 | 2015-01-28 | 富士胶片株式会社 | Zoom lens for projection and projection display device |
| CN212379652U (en) * | 2020-08-24 | 2021-01-19 | 中山联合光电科技股份有限公司 | Projection optical system and projection apparatus |
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| JPH09146001A (en) * | 1995-11-24 | 1997-06-06 | Nikon Corp | Variable power optical system |
| JP2005062227A (en) * | 2003-08-11 | 2005-03-10 | Canon Inc | Zoom lens and imaging apparatus having the same |
| JP4444625B2 (en) * | 2003-10-31 | 2010-03-31 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| US7310191B2 (en) * | 2006-03-09 | 2007-12-18 | Matsushita Electric Industrial Co., Ltd. | Zoom lens system, imaging device and camera |
| JP5345008B2 (en) * | 2009-07-09 | 2013-11-20 | 富士フイルム株式会社 | Projection variable focus lens and projection display device |
| JP5626647B2 (en) * | 2010-12-27 | 2014-11-19 | 株式会社リコー | Zoom lens and imaging device |
| CN106908941B (en) * | 2017-05-04 | 2022-06-21 | 成都东旺光电有限公司 | Image rotating group of zoom sighting telescope and zoom sighting telescope |
| CN107422464B (en) * | 2017-08-30 | 2023-05-26 | 中山联合光电科技股份有限公司 | Zoom projection optical system |
| CN110879457B (en) * | 2019-11-26 | 2023-01-20 | 歌尔光学科技有限公司 | Projection optical system and projection apparatus |
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| CN204129321U (en) * | 2012-04-02 | 2015-01-28 | 富士胶片株式会社 | Zoom lens for projection and projection display device |
| CN212379652U (en) * | 2020-08-24 | 2021-01-19 | 中山联合光电科技股份有限公司 | Projection optical system and projection apparatus |
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