CN216526479U - Short-focus lens system - Google Patents
Short-focus lens system Download PDFInfo
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- CN216526479U CN216526479U CN202120582564.6U CN202120582564U CN216526479U CN 216526479 U CN216526479 U CN 216526479U CN 202120582564 U CN202120582564 U CN 202120582564U CN 216526479 U CN216526479 U CN 216526479U
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Abstract
The utility model relates to the technical field of short-focus lenses, in particular to a short-focus lens system which comprises a shell and a lens group, wherein the lens group is arranged in the shell; the lens group comprises a refraction lens group and an aspheric reflector which are sequentially arranged from the image incidence side to the image emergence side along the central axis of the main mounting lens barrel. In addition, the lens in the lens group is driven to move by arranging the middle group adjusting part, so that the focal lengths under different projection pictures can be adjusted, and the definition of the pictures with different sizes is ensured.
Description
Technical Field
The utility model relates to the technical field of short-focus lenses, in particular to a short-focus lens system.
Background
With the development of projection technology in recent years, projectors have been widely used in various scenes, and among them, ultra-short-focus projection apparatuses have been widely used in the fields of home and office, etc. due to their short distance and large projection screen.
In order to achieve a smaller equipment volume, an optical system of an existing short-focus lens generally adds more aspheric mirrors in an optical lens group to process an optical path, but the processing difficulty of the aspheric mirrors greatly increases the equipment manufacturing cost, and in addition, the aspheric mirrors are sensitive to errors so that the requirements on the installation precision of the aspheric mirrors are higher when the aspheric mirrors are installed, so that the problems that the manufacturing yield of final products is low and mass production cannot be performed are easily caused. And a small part of lenses directly adopt a large number of plastic aspheric mirrors for reducing the cost, but the plastic aspheric mirrors can generate deformation due to high-temperature heating in the use process of products, so that the final display effect of the picture is influenced. At present, no ultra-short focal lens in the market can overcome the defects. Therefore, the present invention has been made in view of the above disadvantages.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a short-focus lens system which is more excellent in high-temperature resistance, easy to machine and manufacture and lower in cost.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a short-focus lens system comprises a shell and a lens group, wherein the lens group is arranged in the shell, the shell comprises a main mounting lens barrel and a lens adjusting mechanism, and the lens adjusting mechanism is connected and arranged on the main mounting lens barrel and used for driving one or more groups of lenses in the lens group to move on the central axis of the main mounting lens barrel;
the lens group includes along the axis of main installation lens cone from image incident side to image emergent side refractive lens group and the aspheric mirror that sets gradually, refractive lens group includes by image incident side to image emergent side direction set gradually:
the rear group lens group comprises a first rear lens with positive focal power, a second rear lens with positive focal power, a third rear lens with negative focal power, a fourth rear lens with positive focal power, a fifth rear lens with negative focal power and a sixth rear lens with positive focal power, which are sequentially arranged along the central axis from the image incidence side to the image emergence side, wherein the second rear lens and the third rear lens are glued and fixed into a whole, and the fifth rear lens and the sixth rear lens are glued and fixed into a whole;
the middle group lens group comprises a first middle lens with positive focal power, a second middle lens with negative focal power and a third middle lens with positive focal power, which are sequentially arranged along a central axis from an image incidence side to an image emergence side, wherein the first middle lens and the second middle lens are glued and fixed into a whole, and the third middle lens can move back and forth in the central axis direction;
the front group lens group comprises a first front lens with positive focal power, a second front lens with positive focal power, a third front lens with negative focal power and a fourth front lens with negative focal power, wherein the first front lens, the second front lens, the third front lens and the fourth front lens are sequentially arranged along the central axis from the image incidence side to the image emergence side.
In the present invention, it is preferable that the focal length of the rear group lens group is 20mm to 30mm, the focal length of the middle group lens group is 400mm to 440mm, the focal length of the front group lens group is-170 mm to-150 mm, and the focal length of the aspherical mirror is 15mm to 25 mm.
In the present invention, preferably, the first rear lens, the second rear lens, the third rear lens, the fourth rear lens, the fifth rear lens, the sixth rear lens, the first middle lens, the second middle lens, the third middle lens, the first front lens, the second front lens, and the third front lens are all glass spherical lenses, the fourth front lens is a plastic aspheric lens, the aspheric mirror is made of a plastic material, a pitch angle of the aspheric mirror is adjustable, and the aspheric mirror can move along a central axis direction. The large deformation of the lens at high temperature can be effectively inhibited by arranging a large number of glass spherical lenses close to the image incidence side, and the influence on the effect of finally projected pictures is further reduced.
In the present invention, it is preferable that the second rear lens has an abbe number larger than that of the third rear lens, the fifth rear lens has an abbe number larger than that of the sixth rear lens, and a difference between the abbe number of the second rear lens and that of the third rear lens and a difference between the abbe number of the fifth rear lens and that of the sixth rear lens are within a range of 40 to 50. The scheme ensures that the whole rear group lens group has better chromatic aberration and field curvature correction effect by controlling the difference value of the dispersion coefficients of two groups of cemented lenses.
In the present invention, it is preferable that the fourth front lens and the aspherical mirror have surface shapes satisfying the following equation:
in the formula, a parameter c is a curvature corresponding to a radius, r is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conical conic coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; beta is a1To beta8Each representing a coefficient corresponding to each radial coordinate. General purpose in the schemeThe TV distortion of the picture can be corrected conveniently by arranging the fourth front lens as a lens with an aspherical surface.
In the present invention, preferably, the lens adjusting mechanism includes a rear group adjusting portion, a middle group adjusting portion and a reflection adjusting portion, a plurality of groups of guiding chutes are uniformly distributed on the circumferential wall of the main mounting barrel, the rear group adjusting portion and the middle group adjusting portion are connected and matched with the guiding chutes to respectively adjust the front and rear displacements of the rear group lens set and the third middle lens on the central axis, and the reflection adjusting portion is mounted on one end portion of the main mounting barrel to mount and adjust the aspheric mirror.
In the present invention, preferably, the middle group adjusting portion includes an adjusting rotating ring and a linking pin, the adjusting rotating ring is rotatably sleeved on the main mounting barrel, the adjusting rotating ring is provided with a linking through groove, and the linking pin is simultaneously inserted into the guiding chute and the linking through groove, so that the linking pin can move along the central axis direction when the adjusting rotating ring and the main mounting barrel relatively rotate.
In the present invention, preferably, a driving mechanism is disposed between the main mounting barrel and the adjusting movable ring, the driving mechanism is configured to drive the adjusting movable ring and the main mounting barrel to rotate relatively, the driving mechanism includes an arc-shaped adjusting tooth block, a connecting bracket, and a motor module, the arc-shaped adjusting tooth block is fixedly connected to the adjusting movable ring, the motor module is fixedly disposed on the main mounting barrel through the connecting bracket, and the motor module drives the arc-shaped adjusting tooth block to rotate around an axis of the motor module. The driving mechanism can drive and adjust the relative rotation between the main mounting lens cone and the adjusting movable ring, so that the linkage pin shaft can be driven to move in the direction of the central axis, and in addition, the motor module can be conveniently and electrically connected with an external electric control module, so that the electric control of the adjusting action of the middle group adjusting part can be realized.
In the present invention, preferably, the rear group adjusting portion includes a rear group installation lens barrel and a plurality of groups of linkage pin shafts, the rear group installation lens barrel is rotatably inserted into the main installation lens barrel, the plurality of groups of linkage pin shafts are vertically and fixedly arranged on a circumferential wall of the rear group installation lens barrel, and the plurality of groups of linkage pin shafts are inserted into the guide chute.
In the present invention, preferably, the reflection adjusting part includes a main mounting frame body and an adjusting slide plate, the adjusting slide plate is slidably fixed on the main mounting frame body, a sliding direction of the adjusting slide plate is a translational adjusting direction of the aspheric mirror, the adjusting slide plate is provided with a mounting cavity, and the aspheric mirror is connected and fixed in the mounting cavity through a ball joint. The adjusting sliding plate is arranged to be connected with the aspheric surface reflector, the aspheric surface reflector is driven by the adjusting sliding plate to move, and meanwhile, the pitching angle of the aspheric surface reflector can be conveniently adjusted by connecting the adjusting sliding plate with the spherical joint.
Compared with the prior art, the utility model has the beneficial effects that:
the optical lens of the utility model adopts the grouping arrangement mode of front, middle and rear groups to arrange along the optical axis, and the rear group and middle group lens group near the image source emitter use the spherical lens made of glass, and the last lens and aspheric surface reflector in the front group lens group far away from the image source emitter use the aspheric surface lens made of plastic, on one hand, the total length of the short-focus lens adopting the lens system can be controlled between 159 and 165mm, the total length is smaller, and at the same time, the lens group near the image source emitter uses the spherical glass lens, so that the lens can not generate too large deformation even if the temperature of the working environment is higher, in addition, the consideration of the influence of the temperature change on the lens deformation is added on the design selection of the surface type parameters of the spherical lens during the design, therefore, the spherical lens can be formed in thickness and curvature because of the spherical lens after the temperature is increased The variable compensation can offset most of distortion caused by temperature, and MTF > 0.5 can still be ensured when 120lp/mm is achieved under the condition of 70 ℃ under multiple test tests.
In addition, the main mounting lens barrel is provided with the mounting adjusting movable ring and the linkage pin shaft to form the middle group adjusting part, and the linkage pin shaft is driven to move in the central axis direction when the main mounting lens barrel and the adjusting movable ring rotate mutually, so that the lenses in the lens group are driven to move, the focal lengths under different projection pictures can be adjusted, and the definition of the pictures with different sizes is ensured. Meanwhile, the electric adjustment of the focal length is realized by arranging the driving mechanism, so that the use of a user is facilitated.
Meanwhile, a rear group adjusting part is arranged to adjust errors generated when the compensation casing and each group of lens are assembled so as to ensure the projection effect, and the reflection adjusting part is used for adjusting the angle and the position of a finally projected picture so as to facilitate a user to obtain the best viewing experience.
Drawings
Fig. 1 is a schematic structural diagram of a short-focus optical lens according to the present invention.
FIG. 2 is a graph of MTF values at 20 ℃ under a projection operating condition of 60 "diagonal field of view.
FIG. 3 is a graph of MTF values at 45 ℃ under a projection operating condition of 60-inch diagonal field of view.
FIG. 4 is a graph of MTF values at 70 ℃ under a projection operating condition of 60 "diagonal field of view.
FIG. 5 is a diagram of TV distortion at a throw distance of 60 inches in accordance with the present invention.
Fig. 6 is an exploded view of the overall structure of the present invention.
Fig. 7 is a schematic view of the overall connection structure of the main mounting barrel and the middle group adjusting part in the present invention.
Fig. 8 is an exploded view of the main mounting tube, the adjusting movable ring and the linking pin of the present invention.
Fig. 9 is a schematic view of the overall structure of the drive mechanism of the present invention.
Fig. 10 is a schematic view of the overall structure of the reflection adjusting part of the present invention.
Fig. 11 is an exploded view of the main mounting frame, the adjusting slide plate and the reflector according to the present invention.
Fig. 12 is a sectional structure diagram of the lens spacing mechanism of the present invention.
Fig. 13 is a schematic view of the overall structure of the reflector of the present invention.
Fig. 14 is a schematic view of the overall structure of the adjusting slide plate of the present invention.
In the drawings: 1. a first rear lens; 2. a second rear lens; 3. a third rear lens; 4. a fourth rear lens; 5. a fifth rear lens; 6. a sixth rear lens; 7. a first middle lens; 8. a second middle lens; 9. a third middle lens; 10. a first front lens; 11. a second front lens; 12. a third front lens; 13. a fourth front lens; 14. an aspherical mirror; 141. a ball joint; 142. a guide post; 143. the limiting connection lug is connected with the limiting connection lug; 144. a stepped through hole; 15. an image source transmitter;
16. a main mount lens barrel; 161. a guide chute; 162. a guide ring groove; 20. an upper adjusting ring; 201. a linkage through groove; 21. a lower adjustment ring; 210. a gear lever; 211. an arc-shaped adjusting tooth block; 212. a slider; 22. a linkage pin shaft; 23. a connecting body; 24. arranging a platform; 25. a sensor; 26. a motor module; 27. a drive gear;
31. a main mounting frame body; 311. a guide slide rail; 32. adjusting the sliding plate; 321. a U-shaped hole; 322. a containing groove; 323. a ball joint connecting groove; 33. an upper connecting cover plate; 331. an exit window; 34. a lower connecting shell; 35. buckling pieces; 41. a limiting threaded hole; 42. a limiting spring; 43. and adjusting the bolt.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 6, a preferred embodiment of the present invention provides a short-focus lens system, which includes a housing and a lens group, wherein the lens group is mounted in the housing, the housing includes a main mounting barrel 16 and a lens adjusting mechanism, and the lens adjusting mechanism is mounted on the main mounting barrel 16 in a connecting manner to drive one or more lenses of the lens group to move on a central axis of the main mounting barrel 16; the collinear central axis of the refraction lens group and the central axis of the main mounting lens barrel 16 are both the optical axis of the short-focus lens;
the refraction lens group comprises a plurality of lenses which are sequentially arranged along the optical axis from the image incidence side to the image emergence side:
the rear group lens group can move back and forth in the direction of the optical axis, and the focal power of the rear group lens group is positive; the rear group lens group comprises a first rear lens 1 with positive focal power, a second rear lens 2 with positive focal power, a third rear lens 3 with negative focal power, a fourth rear lens 4 with positive focal power, a fifth rear lens 5 with negative focal power and a sixth rear lens 6 with positive focal power, which are sequentially arranged along an optical axis from an image incidence side to an image emergence side, wherein the second rear lens 2 and the third rear lens 3 are fixed into a whole through optical glue, the fifth rear lens 5 and the sixth rear lens 6 are fixed into a whole through optical glue, and the difference value between the dispersion coefficient of the second rear lens 2 and the dispersion coefficient of the third rear lens 3 and the difference value between the dispersion coefficient of the fifth rear lens 5 and the dispersion coefficient of the sixth rear lens 6 fall between 40-50. And the rear group lens group forms a square telecentric light path. The cemented lens is formed by combining high-dispersion coefficient and low-dispersion coefficient glass, the dispersion coefficient of the second rear lens 2 is larger than that of the third rear lens 3, the dispersion coefficient of the fifth rear lens 5 is larger than that of the sixth rear lens 6, and the fourth rear lens 4 is clamped between the two groups of double cemented lenses in an approximately symmetrical structure, so that the effect of correcting chromatic aberration and field curvature can be well achieved. The rear group lens group can move and adjust relative to the image source emitter 15 in the direction of the optical axis, so that the focal length can be adjusted, the arrangement has the effect of compensating errors caused in the assembling and mounting of the shell and the lens group, and the adjustment before the product leaves the factory can be conveniently detected and debugged by a product when the product leaves the factory for detection.
As shown in fig. 1, the power of the middle group lens group is negative; the middle group lens group comprises a first middle lens 7 with positive focal power, a second middle lens 8 with negative focal power and a third middle lens 9 with positive focal power, which are sequentially arranged along the optical axis from the image incidence side to the image emergence side, wherein the first middle lens 7 and the second middle lens 8 are fixed into a whole in a gluing mode, and the third middle lens 9 can move back and forth in the optical axis direction. The focal length of the whole lens group can be adjusted by moving the position of the third lens, so that the user can conveniently adjust the definition of the image with different projection sizes to ensure the projection effect of the image.
And the front group lens group is fixedly arranged in the direction of an optical axis, and the focal power of the front group lens group is negative. The front group lens group includes a first front lens 10 having positive power, a second front lens 11 having positive power, a third front lens 12 having negative power, and a fourth front lens 13 having negative power, which are arranged in this order from the image incident side to the image exit side along the optical axis.
The focal length of the rear group lens group is 20 mm-30 mm, the focal length of the middle group lens group is 400 mm-440 mm, the focal length of the front group lens group is-170 mm-150 mm, and the focal length of the aspheric surface reflector 14 is 15 mm-25 mm.
As shown in fig. 1, the first rear lens 1, the second rear lens 2, the third rear lens 3, the fourth rear lens 4, the fifth rear lens 5, the sixth rear lens 6, the first middle lens 7, the second middle lens 8, the third middle lens 9, the first front lens 10, the second front lens 11, and the third front lens 12 are all glass spherical lenses, the fourth front lens 13 is a plastic aspheric lens, and the aspheric reflector 14 is made of a plastic material. The aspherical mirror 14 can be displaced back and forth in the optical axis direction, and the pitch angle of the aspherical mirror 14 can be adjusted. Therefore, the size and the position of the finally projected picture can be finely adjusted, so that the projection position of the picture is ensured to be proper.
The surface shape of the fourth front lens 13 and the aspherical mirror 14 satisfies the following equation:
in the formula, a parameter c is a curvature corresponding to a radius, r is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conical conic coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; beta is a1To beta8Each representing a coefficient corresponding to each radial coordinate. In the present embodiment, the projection ratio of the short-focus lens is 0.25, and the frame resolution is 1080 p.
The following is a specific parameter table of each spherical lens used in this embodiment:
s25 and S26 of the fourth front lens 13 are both even aspheric surfaces, the thickness is 3.53mm, the effective caliber of S25 is 31mm, the effective caliber of S26 is 33.5mm, the fourth front lens is made of ZEONEX-330R-2017, and the parameters of the aspheric surfaces of S25 and S26 are shown in the following table:
the aspheric mirror 14 has the following surface coefficients:
the short-focus lens in the present embodiment can achieve or achieve the best projection effect in a 60-inch diagonal field of view, and as shown in fig. 5, the TV distortion of the short-focus lens in the present embodiment is-0.1% when the projection distance is 60 inches, which has a better optimization effect on TV distortion.
In addition, as shown in fig. 2 to 4, MTF values at 20 ℃, 45 ℃ and 70 ℃ were tested in an operating state of projection of a 60-inch diagonal field of view for the short-focus lens in this embodiment. The MTF (modulation transfer function) value graph is used for measuring the quality such as the resolution and the like which are the most important for the optical lens, the MTF value is defined to be certainly larger than 0 and smaller than 1, and the higher the MTF value is in the technical field, the more excellent the performance of the lens is, namely the resolution is high; in the figure, the ordinate represents the MTF value and the abscissa represents the spatial frequency. Generally, the higher the temperature is, the greater the distortion of the lens group is, the worse the image quality of the projected image is, and it can be known from the figure that the present embodiment can still ensure that MTF > 0.5 even at a high temperature of 70 ℃ and at 120lp/mm, and thus it can be known that the short-focus lens in the present embodiment has a smaller distortion at a high temperature, and can still have a higher image quality, and the high temperature resistance is more excellent.
As shown in fig. 6, in the present invention, the lens adjusting mechanism includes a rear group adjusting portion, a middle group adjusting portion and a reflection adjusting portion, a plurality of sets of guiding chutes 161 are uniformly distributed on the circumferential wall of the main mounting barrel 16, the rear group adjusting portion and the middle group adjusting portion are connected and matched with the guiding chutes 161 to respectively adjust the front and rear displacements of the rear group lens set and the third middle lens 9 on the central axis, and the reflection adjusting portion is mounted on one end of the main mounting barrel 16 to mount and adjust the aspheric mirror 14.
As shown in fig. 6, the rear group adjusting portion includes a rear group accommodating barrel and a plurality of sets of linkage pins 22, each lens in the rear group lens group is mounted and fixed in the rear group accommodating barrel, the rear group accommodating barrel rotatably penetrates through the main mounting barrel 16, the plurality of sets of linkage pins 22 are vertically and fixedly disposed on the circumferential wall of the rear group accommodating barrel, and the plurality of sets of linkage pins 22 penetrate through the guide chute 161. When the rear group mounting barrel and the main mounting barrel 16 rotate relatively, the linkage pin 22 moves in the guide chute 161, and the guide chute 161 is inclined along the outer circumferential wall of the main mounting barrel 16, so that the rear group lens group can be moved and adjusted in the direction of the central axis (optical axis) during the movement of the linkage pin 22.
As shown in fig. 7 to 9, the middle group adjusting portion includes an adjusting rotating ring and a linking pin 22, the adjusting rotating ring is rotatably sleeved on the main mounting barrel 16, the adjusting rotating ring is provided with a linking through groove 201, and the linking pin 22 is simultaneously inserted into the guiding chute 161 and the linking through groove 201, so that the linking pin 22 can move along the central axis direction when the adjusting rotating ring and the main mounting barrel 16 rotate relatively. A guide ring groove 162 is formed along the circumferential direction of the main mounting barrel 16, a sliding block 212 is fixedly arranged on the adjusting movable ring, and the sliding block 212 is slidably arranged in the guide ring groove 162. The guide ring groove 162 is used to ensure that the adjusting ring does not axially shift when rotating on the main mounting barrel 16, thereby also ensuring stable movement of the linking pin 22 in the guide chute 161 and the linking through groove 201.
As shown in fig. 8, the main mounting barrel 16 is a cylindrical structure and is integrally formed by die casting an aluminum alloy, so that the manufacturing accuracy can be ensured and the accuracy after lens mounting can be further ensured, and the plurality of sets of guide chutes 161 are uniformly arranged along the circumferential direction of the main mounting barrel 16. In practical use, 3 sets of guide chutes 161 are usually provided to achieve better use effect. The length direction of the linkage through groove 201 is consistent with the axial direction of the adjusting movable ring. Therefore, when the adjusting movable ring is sleeved with the main mounting barrel 16, the linkage pin 22 can be just installed at the intersection of the guide chute 161 and the linkage through groove 201, and then rotates around the axis along with the linkage through groove 201, the linkage pin 22 also rotates around the axis under the driving of the linkage through groove, but when the linkage pin 22 does the circular motion, the linkage pin 22 only moves in the axis direction due to the limitation of the guide chute 161, so that the purpose of moving the lens is achieved, and in order to adapt to the movement of the linkage pin 22 in the axial direction, the linkage through groove 201 is provided with a long-strip-shaped hole, so that the linkage pin 22 can normally move in the linkage through groove.
As shown in fig. 9, a driving mechanism is disposed between the main mounting barrel 16 and the adjusting rotating ring, and the driving mechanism is used for driving the adjusting rotating ring and the main mounting barrel 16 to rotate relatively. The driving mechanism comprises an arc-shaped adjusting toothed block 211, a connecting support and a motor module 26, the arc-shaped adjusting toothed block 211 is fixedly connected to a lower adjusting ring 21 of the adjusting movable ring, a symmetrical plane of the arc-shaped adjusting toothed block 211 coincides with a symmetrical plane of the lower adjusting ring 21, the motor module 26 is fixedly arranged on the main mounting lens barrel 16 through the connecting support, and the motor module 26 drives the arc-shaped adjusting toothed block 211 to rotate around the axis of the motor module 26. The motor module 26 comprises a driving motor and a controller, the controller is used for receiving and sending control signals to complete the control of the specific movement action of the motor, a driving gear 27 is fixedly mounted at the end part of an output shaft of the motor, and the driving gear 27 can drive the arc-shaped driving gear block to rotate through the driving gear 27, so that the driving of the adjusting movable ring is realized.
As shown in fig. 8 and 9, the adjusting rotating ring includes an upper adjusting ring 20 and a lower adjusting ring 21, a stop lever 210 is fixedly disposed on the adjusting rotating ring, two sets of sensors 25 are symmetrically disposed on the connecting bracket, and both sets of sensors 25 are used for detecting the position of the stop lever 210. The connecting support is of a bilateral symmetry structure, the symmetry plane of the connecting support coincides with the symmetry plane of the lower adjusting ring 21, the connecting support comprises a connecting main body 23 and two groups of mounting platforms 24, and the two groups of mounting platforms 24 are symmetrically fixed on two sides of the connecting main body 23. The two sets of mounting platforms 24 are used for fixedly mounting the sensors 25, and the two sets of sensors 25 which are symmetrically arranged can be used as calibration limitation for adjusting the maximum stroke of the moving ring on one hand and can also be used as reference zero points when the gear lever 210 moves on the other hand. When the product is debugged after being assembled, the motor can be used for driving the adjusting movable ring to move to obtain the clearest picture on the initially set projection picture when leaving the factory, the position is memorized by the system, and the motor can be controlled by the external controller (remote control) to adjust the definition of the picture if a later-stage client changes the projection picture. Since the linkage pin 22 is fixed to the mounting ring of the lens to drive the lens to move, the linkage pin 22 is usually fixedly connected to the mounting ring of the lens, so that the lens can be mounted from the outside of the main mounting barrel 16, a screwing through groove is formed at one end of the linkage pin 22, and a thread is formed on the circumferential wall of the outer side of the end far away from the screwing through groove. The outer circumferential wall of the mounting ring of the lens is also provided with a threaded hole matched with the mounting ring, so that the connection can be completed only from the outside when the mounting ring is connected and mounted, and the convenience of product mounting is improved, and the later maintenance can be facilitated.
As shown in fig. 10 to 14, the reflection adjustment portion includes a main mounting frame body 31 and an adjustment sliding plate 32, the adjustment sliding plate 32 is provided with a plurality of sets of U-shaped holes 321, and then the adjustment sliding plate 32 is fixed on the main mounting frame body 31 by screws, the adjustment sliding plate 32 can move before being fixed due to the U-shaped holes 321, a sliding direction of the adjustment sliding plate 32 is a translational adjustment direction of the aspherical mirror 14, and the adjustment sliding plate 32 is provided with an installation cavity for connecting and fixing the aspherical mirror 14.
As shown in fig. 11 to 14, the installation cavity includes an accommodation groove 322 and a buckle 35, the accommodation groove 322 is fixedly disposed on the adjustment sliding plate 32, an opening direction of the accommodation groove 322 faces a translational adjustment direction of the aspheric mirror 14, the buckle 35 is fixedly disposed at one end of the accommodation groove 322 to form a space with a closed periphery for fixedly connecting the aspheric mirror 14, and a plurality of sets of ball joint connection grooves 323 are disposed in the accommodation groove 322. After the spherical joint connecting groove 323 is connected with the spherical joint 141 arranged in the ball head connecting part of the aspheric mirror 14, the aspheric mirror 14 can be adjusted in pitch, in this embodiment, the spherical joint connecting groove 323 is selectively arranged on a side wall opposite to the buckle piece 35, and the buckle piece 35 fixed on the accommodating groove 322 is perpendicular to the translational adjustment direction of the aspheric mirror 14. Therefore, in actual installation, two groups of ball joints 141 are symmetrically arranged on the ball head connecting part of the aspheric mirror 14, wherein one ball joint 141 is arranged in the ball joint connecting groove, then the other ball joint 141 is abutted against the buckle piece 35, then the buckle piece 35 is arranged to be a sheet-shaped object made of elastic material and fixed on the outer wall of the accommodating groove 322 by screws, therefore, when the aspheric mirror 14 is adjusted in a pitching angle, the ball joint 141 on one side freely rotates in the ball joint connecting groove 323, the ball joint 141 on the other side is always abutted against the buckle piece 35, thereby ensuring that even if the position of the connecting part of the aspheric mirror 14 and the adjusting slide plate 32 is changed, the aspheric mirror 14 can be prevented from falling off from the installation cavity because the ball joint 141 on the other side is always abutted against the buckle piece 35, and in addition, by arranging the buckle piece 35 to be a sheet-shaped object made of elastic material, therefore, when the spherical joint 141 slides relative to the cramp 35, the cramp 35 deforms to facilitate the movement of the spherical joint 141, which can ensure the tightness of the connection between the aspheric mirror 14 and the adjusting slide plate 32, and at the same time, due to the deformation capability of the cramp 35 itself, ensure that there is less resistance when the spherical joint 141 moves, so as to prevent the aspheric mirror 14 from being distorted to change the shape of the mirror surface and further affect the projection effect.
As shown in fig. 10 and 12, a plurality of sets of lens limiting mechanisms are disposed on a set of side walls of the main mounting frame 31 away from the mounting adjustment sliding plate 32, and the lens limiting mechanisms drive the aspheric mirror 14 to move along the translation adjustment direction of the aspheric mirror 14.
As shown in fig. 12, the lens limiting mechanism includes an adjusting bolt 43, a limiting spring 42, a limiting threaded hole 41 disposed on the main mounting frame 31, and a limiting connecting lug 143 fixed on the aspheric mirror 14, the limiting lug is provided with a stepped through hole 144, the adjusting bolt 43 is fixedly connected to the limiting threaded hole 41 and the limiting connecting lug 143, and the limiting spring 42 is clamped between the limiting connecting lug 143 and the main mounting frame 31. The diameter of the stepped through hole 144 is larger than the nominal diameter of the adjustment bolt 43. Therefore, when the pitch angle of the aspherical mirror 14 is adjusted, the adjusting bolt 43 does not interfere with the stepped through hole 144, and the mirror surface of the aspherical mirror 14 is not deformed.
As shown in fig. 11, the main mounting frame body 31 is provided with a guide rail 311, and the sliding direction of the guide rail 311 is the same as the translational adjustment direction of the aspherical mirror 14. The guide rail 311 is provided to facilitate guiding when the aspherical mirror 14 translates.
As shown in fig. 10, the main mounting frame 31 is fixedly provided with a lower connecting shell 34 and an upper connecting cover plate 33, and the upper connecting cover plate 33 is fixedly provided with an exit window 331 for outputting all the light rays reflected from the aspheric reflector 14. Can form a confined installation cavity after connecting shell 34 and upper junction apron 33 fixed connection on main installation support body 31 down and place aspherical mirror 14 with the installation, be provided with constant head tank and location strip in the junction of upper cover plate and main installation support body 31, when the upper cover plate installation is fixed on main installation support body 31, constant head tank and location strip block each other, positioning accuracy when can guaranteeing the installation from this on the one hand, on the other hand can improve the leakproofness of junction in order to prevent that the dust from getting into.
When the front and back displacement of the aspheric mirror 14 is adjusted integrally, the screw fixed in the U-shaped hole 321 on the adjusting slide plate 32 is firstly loosened, then the front and back position of the aspheric mirror 14 is adjusted by rotating the adjusting bolt 43, and after the adjustment is finished, the screw is fastened and screwed into the U-shaped hole 321 to fix the adjusting slide plate 32;
when the pitch angle adjustment is required, the adjustment bolt 43 is directly rotated to adjust the positional displacement of the lower portion of the aspherical mirror 14, and the upper portion of the aspherical mirror 14 is pivotally connected by the ball joint 141, so that the aspherical mirror 14 does not undergo displacement due to the change in the pitch angle when the adjustment bolt 43 is adjusted.
The working principle is as follows:
after the lenses of each group are mounted in the main mounting lens barrel 16, various assembly errors caused in the assembly process are adjusted and compensated through the rear group adjusting part, then the focal length of the lens group is adjusted through the remote control adjusting part in the use process so as to ensure the definition of images projected into pictures with different sizes, in addition, the front-back displacement and the pitching angle of the aspheric surface reflector 14 can be adjusted through the reflection adjusting part, and therefore the projection position of the pictures can be adjusted, and a user can obtain the best viewing experience.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A short-focus lens system is characterized by comprising a shell and a lens group, wherein the lens group is arranged in the shell, the shell comprises a main mounting lens barrel (16) and a lens adjusting mechanism, and the lens adjusting mechanism is connected and arranged on the main mounting lens barrel (16) and used for driving one or more groups of lenses in the lens group to move on the central axis of the main mounting lens barrel (16);
the lens group includes along the axis of main installation lens cone (16) from image incident side to image emergent side refraction lens group and aspheric surface speculum (14) that set gradually, refraction lens group includes by image incident side to image emergent side direction set gradually:
the rear group lens group comprises a first rear lens (1) with positive focal power, a second rear lens (2) with positive focal power, a third rear lens (3) with negative focal power, a fourth rear lens (4) with positive focal power, a fifth rear lens (5) with negative focal power and a sixth rear lens (6) with positive focal power, wherein the first rear lens (1), the second rear lens (2), the third rear lens (3) with negative focal power, the fourth rear lens (4), the fifth rear lens (5) with negative focal power and the sixth rear lens (6) with positive focal power are sequentially arranged along the central axis from the image incidence side to the image emergence side, the second rear lens (2) and the third rear lens (3) are fixedly glued into a whole, and the fifth rear lens (5) and the sixth rear lens (6) are fixedly glued into a whole;
the middle group lens group comprises a first middle lens (7) with positive focal power, a second middle lens (8) with negative focal power and a third middle lens (9) with positive focal power, which are sequentially arranged along a central axis from an image incidence side to an image emergence side, wherein the first middle lens (7) and the second middle lens (8) are glued and fixed into a whole, and the third middle lens (9) can move back and forth in the central axis direction;
the front group lens group comprises a first front lens (10) with positive focal power, a second front lens (11) with positive focal power, a third front lens (12) with negative focal power and a fourth front lens (13) with negative focal power, wherein the first front lens (10), the second front lens (11), the third front lens (12) and the fourth front lens (13) are sequentially arranged along the central axis from the image incidence side to the image emergence side.
2. A short focal length lens system as claimed in claim 1, wherein the focal length of the rear group lens group is 20mm to 30mm, the focal length of the middle group lens group is 400mm to 440mm, the focal length of the front group lens group is-170 mm to-150 mm, and the focal length of the aspherical mirror (14) is 15mm to 25 mm.
3. The short-focus lens system as claimed in claim 2, wherein the first rear lens (1), the second rear lens (2), the third rear lens (3), the fourth rear lens (4), the fifth rear lens (5), the sixth rear lens (6), the first middle lens (7), the second middle lens (8), the third middle lens (9), the first front lens (10), the second front lens (11), and the third front lens (12) are all glass spherical lenses, the fourth front lens (13) is a plastic aspheric lens, the aspheric mirror (14) is made of plastic material, the pitch angle of the aspheric mirror (14) is adjustable, and the aspheric mirror (14) can move along the central axis direction.
4. A short focus lens system according to claim 1, wherein the second rear lens (2) has an abbe number larger than that of the third rear lens (3), the fifth rear lens (5) has an abbe number larger than that of the sixth rear lens (6), and the difference between the abbe number of the second rear lens (2) and the abbe number of the third rear lens (3) and the difference between the abbe number of the fifth rear lens (5) and the abbe number of the sixth rear lens (6) are between 40 and 50.
5. A short focal lens system according to claim 1, wherein the surface shape of the fourth front lens (13) and the aspherical mirror (14) satisfies the following equation:
in the formula, a parameter c is a curvature corresponding to a radius, r is a radial coordinate, the unit of the radial coordinate is the same as the unit of the length of the lens, and k is a conical conic coefficient; when the k coefficient is less than-1, the surface-shaped curve of the lens is a hyperbolic curve, and when the k coefficient is equal to-1, the surface-shaped curve of the lens is a parabola; when the k coefficient is between-1 and 0, the surface-shaped curve of the lens is an ellipse, when the k coefficient is equal to 0, the surface-shaped curve of the lens is a circle, and when the k coefficient is more than 0, the surface-shaped curve of the lens is an oblate; beta is a1To beta8Each representing a coefficient corresponding to each radial coordinate.
6. The short-focus lens system according to claim 1, wherein the lens adjusting mechanism comprises a rear group adjusting portion, a middle group adjusting portion and a reflection adjusting portion, a plurality of groups of guiding chutes (161) are uniformly distributed on the circumferential wall of the main mounting barrel (16), the rear group adjusting portion and the middle group adjusting portion are respectively connected and matched with the guiding chutes (161) to adjust the front and rear displacements of the rear group lens set and the third middle lens (9) on the central axis, and the reflection adjusting portion is respectively mounted at one end of the main mounting barrel (16) to mount and adjust the aspheric reflector (14).
7. The short-focus lens system according to claim 6, wherein the middle group adjusting part comprises an adjusting rotating ring and a linkage pin shaft (22), the adjusting rotating ring is rotatably sleeved on the main mounting barrel (16), the adjusting rotating ring is provided with a linkage through groove (201), and the linkage pin shaft (22) is simultaneously inserted into the guide chute (161) and the linkage through groove (201), so that the linkage pin shaft (22) can move along the central axis direction when the adjusting rotating ring and the main mounting barrel (16) relatively rotate.
8. The short-focus lens system according to claim 7, wherein a driving mechanism is disposed between the main mounting barrel (16) and the adjusting rotating ring, the driving mechanism is used for driving the adjusting rotating ring and the main mounting barrel (16) to rotate relatively, the driving mechanism includes an arc-shaped adjusting tooth block (211), a connecting bracket and a motor module (26), the arc-shaped adjusting tooth block (211) is fixedly connected to the adjusting rotating ring, the motor module (26) is fixedly disposed on the main mounting barrel (16) through the connecting bracket, and the motor module (26) drives the arc-shaped adjusting tooth block (211) to rotate around an axis thereof.
9. The short focal lens system of claim 6, wherein the rear group adjusting portion comprises a rear group mounting barrel rotatably inserted into the main mounting barrel (16) and a plurality of sets of linking pins (22), the plurality of sets of linking pins (22) are vertically and fixedly disposed on a circumferential wall of the rear group mounting barrel, and the plurality of sets of linking pins (22) are inserted into the guiding chutes (161).
10. The short-focus lens system as claimed in claim 6, wherein the reflection adjusting part comprises a main mounting frame body (31) and an adjusting sliding plate (32), the adjusting sliding plate (32) is slidably fixed on the main mounting frame body (31), the sliding direction of the adjusting sliding plate (32) is the translational adjusting direction of the aspheric surface reflector (14), a mounting chamber is arranged on the adjusting sliding plate (32), and the aspheric surface reflector (14) is fixedly connected in the mounting chamber through a ball joint (141).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120582564.6U CN216526479U (en) | 2021-03-22 | 2021-03-22 | Short-focus lens system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120582564.6U CN216526479U (en) | 2021-03-22 | 2021-03-22 | Short-focus lens system |
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| CN216526479U true CN216526479U (en) | 2022-05-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657275A (en) * | 2022-12-12 | 2023-01-31 | 沂普光电(天津)有限公司 | Ultra-short-focus projection lens and projection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115657275A (en) * | 2022-12-12 | 2023-01-31 | 沂普光电(天津)有限公司 | Ultra-short-focus projection lens and projection system |
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