CN117991425A - Stray light eliminating multi-fold prism and optical lens - Google Patents
Stray light eliminating multi-fold prism and optical lens Download PDFInfo
- Publication number
- CN117991425A CN117991425A CN202410397682.8A CN202410397682A CN117991425A CN 117991425 A CN117991425 A CN 117991425A CN 202410397682 A CN202410397682 A CN 202410397682A CN 117991425 A CN117991425 A CN 117991425A
- Authority
- CN
- China
- Prior art keywords
- prism
- transmission
- diaphragm
- ratio
- stray light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 46
- 230000005540 biological transmission Effects 0.000 claims abstract description 101
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000003384 imaging method Methods 0.000 claims description 23
- 238000007650 screen-printing Methods 0.000 claims description 13
- 239000003292 glue Substances 0.000 claims description 8
- 238000001259 photo etching Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000004075 alteration Effects 0.000 description 5
- 239000005308 flint glass Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 239000005331 crown glasses (windows) Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
Abstract
The application discloses a stray light eliminating multi-fold prism and an optical lens, which comprise a first transmission surface, a first reflection surface, a second reflection surface and a cutting surface, wherein the first transmission surface, the first reflection surface, the second reflection surface and the cutting surface are positioned outside, the first reflection surface and the second reflection surface are positioned on the first side of the first transmission surface, the included angles between the first reflection surface, the second reflection surface and the first transmission surface are smaller than 90 degrees, at least part of the cutting surface is provided with a light transmission area, the light transmission area is suitable for allowing light to pass through, at least part of the cutting surface is provided with a first diaphragm, and the first diaphragm is suitable for limiting the light to pass through.
Description
Technical Field
The application relates to the technical field of optical imaging, in particular to a stray light eliminating multi-fold prism and an optical lens.
Background
In photography, different types of shots play an important role, with tele shots being a powerful tool that helps us capture details of the distance and reveal attractive views. The tele lens is simply a lens with a narrow viewing angle, and is suitable for shooting a long-distance object. Its angle of view is small, so the shooting range is limited, and a close-distance subject may not be completely put in the screen. In order to reduce the size of a tele lens, a multifocal prism is currently used to reduce the size of the lens.
However, the existing tele lens using the multifocal prism has the following defects: the use of multifocal prisms tends to increase the risk of stray light phenomena, which can have a significant impact on imaging.
Disclosure of Invention
The application aims to provide a stray light eliminating multi-fold prism and an optical lens which are compact in structure and good in stray light eliminating effect.
In order to achieve the above purpose, the application adopts the following technical scheme: the utility model provides a stray light eliminating multi-fold prism, includes the first transmission face that is located outside, first reflecting surface, second reflecting surface and the cutting plane that is located inside, first reflecting surface with the second reflecting surface is located the first side of first transmission face, first reflecting surface with the contained angle between the second reflecting surface and the first transmission face is all less than 90, at least part the cutting plane is formed with the light-passing area, the light-passing area is suitable for making light pass through, at least part the cutting plane is formed with first diaphragm, first diaphragm is suitable for restricting light and passes through.
In some embodiments, the multi-fold prism comprises a first prism and a second prism, the first prism and the second prism are suitable for combination connection, the combination is formed into the cut surface, and the first prism and the second prism are at least in the light transmission area in a gluing connection.
In some embodiments, the angle between the first reflective surface and the first transmissive surface and the second reflective surface and the first transmissive surface is θ,29 ° < θ < 32 °.
In some embodiments, the first aperture is a lithographic aperture, the first aperture having a thickness of less than 0.02mm.
In some embodiments, the first reflecting surface and the second reflecting surface are respectively engaged with two ends of the first transmitting surface in a matching manner, a first chamfer is arranged at an engagement position of the first reflecting surface and the first transmitting surface, a second chamfer is arranged at an engagement position of the second reflecting surface and the first transmitting surface, a tangent plane of the second chamfer is perpendicular to the first transmitting surface, and a height of the first chamfer is larger than a height of the second chamfer.
In some embodiments, the ratio x 1 between the height of the first chamfer and the length of the first transmissive face is 0.02 < x 1 < 0.06; the ratio x 2 between the height of the second chamfer and the length of the first transmissive surface is 0.01 < x 2 < 0.06.
In some embodiments, a first screen print is disposed around the first transmission surface, a ratio x 3 of a width of the first screen print on one side to a width of the first transmission surface in a first direction is 0.18 < x 3 < 0.4, and a ratio x 4 of a width of the first screen print on one side to a length of the first transmission surface in a second direction is 0.03 < x 4 < 0.1.
In some embodiments, the first reflective surface is provided with second silk-screen printing at a connecting edge with the first transmissive surface and two adjacent side edges, a ratio x 5 of a width of the second silk-screen printing on one side to a width of the first reflective surface is 0.25 < x 5 < 0.315 in a first direction, and a ratio x 6 of a width of the second silk-screen printing to a length of the first reflective surface is 0.11 < x 6 < 0.22 in a second direction.
In some embodiments, the second reflective surface is provided with a third screen print at a connecting edge with the first transmissive surface and adjacent two side edges, a ratio x 7 of a width of the third screen print to a width of the second reflective surface on one side in a first direction is 0.19 < x 7 < 0.3, and a ratio x 8 of a width of the third screen print to a length of the second reflective surface in a second direction is 0.14 < x 8 < 0.18.
In some embodiments, the object side and the image side are located on a second side of the first transmission surface, the first transmission surface is adapted to receive at least part of the light emitted from the object side, the first reflection surface, the first transmission surface and the second reflection surface are adapted to reflect at least part of the received light, the first transmission surface is adapted to emit at least part of the reflected light to the image side, the multifocal prism further comprises a second transmission surface located on the outside, the second transmission surface is parallel to the first transmission surface, the cut-off surface is perpendicular to the first transmission surface, the cut-off surface is adapted to cut off the first transmission surface and the second transmission surface, the light transmission area is close to the first transmission surface, and the first diaphragm is close to the second transmission surface.
In some embodiments, the distance between the first transmissive surface and the second transmissive surface is d, and the ratio between the length a of the first diaphragm and the distance d satisfies the following formula:
0.6<a/d<0.7。
In some embodiments, the multi-fold prism further includes a first side and a second side located at the outside, the second transmissive surface is spaced apart from the first transmissive surface, a distance between the first transmissive surface and the second transmissive surface is d, the first side and the second side are spaced apart, a distance between the first side and the second side is h, and a ratio of the distance d to the distance h satisfies the following formula:
0.3＜d/h＜0.6。
An optical lens comprises an optical system composed of a lens group and a second diaphragm, any of the multi-fold prisms and an imaging chip, wherein the ratio alpha of the distance between the central line of the optical system and the central line of the imaging chip to the focal length range of the lens group satisfies the following formula:
13/23＜α＜13/18。
In some embodiments, the ratio β of the length of the first transmissive surface to the focal length of the lens group satisfies the following equation:
0.8＜β＜1.0。
In some embodiments, the multifocal prism further includes a first side and a second side, the first side and the second side being spaced apart, a spacing between the first side and the second side being h, a ratio of the spacing h to a diameter b of a largest lens in the lens group satisfying the following formula:
0.6＜h/b＜1.0。
In some embodiments, the ratio between the clear aperture of the first diaphragm and the clear aperture of the second diaphragm is greater than 2 and less than 4.
In some embodiments, the second diaphragm is disposed in the direction of the lens group near the object side, and the lens in the lens group gradually decreases from the object side to the image side.
Compared with the prior art, the application has the beneficial effects that:
1. The stray light eliminating multi-fold prism has a compact overall structure, good optical performance and low self height, can reduce the lens height of a long-focus system, is matched with the diaphragm arranged in the multi-fold prism, combines the size of the multi-fold prism, and can effectively eliminate stray light generated by repeated reflection of light in the multi-fold prism.
2. The stray light eliminating multi-fold prism improves the incidence stray light and the reflection stray light of the light on the edges and the side walls of each face by arranging the chamfer and the silk screen, and improves the final imaging quality.
3. The optical lens of the application improves the imaging performance of the whole lens by optimizing the structural design of the optical system, the multi-fold prism and the imaging chip in the lens and carrying out the integral design by matching with the performance of the multi-fold prism, thereby effectively improving the parasitic light generated by the optical system due to overlarge view field angle.
Drawings
Fig. 1 is a schematic view of the overall structure according to a preferred embodiment of the present application.
Fig. 2 is a side view of a preferred embodiment according to the present application.
Fig. 3 is a schematic view showing a structure in which a multi-fold prism is split according to a preferred embodiment of the present application.
Fig. 4 is a front view of a first transmissive surface according to a preferred embodiment of the present application.
Fig. 5 is a front view of a first reflective surface in accordance with a preferred embodiment of the present application.
Fig. 6 is a front view of a second reflective surface according to a preferred embodiment of the present application.
Fig. 7 is a schematic diagram of an optical lens according to a preferred embodiment of the present application.
Fig. 8 is a schematic view of the inclined surface of the multifocal prism in accordance with a preferred embodiment of the present application in a proper range.
Fig. 9 is a schematic view of the case where the inclined surface of the multifocal prism is excessively large according to a preferred embodiment of the present application.
Fig. 10 is a schematic view of the principle of the multi-fold prism according to a preferred embodiment of the present application when the inclined surface is too small.
Fig. 11 is a schematic view showing a structure in which an optical lens according to a preferred embodiment of the present application is mounted on a mobile phone.
In the figure: 1. a multifold prism; 11. a first transmissive surface; 111. a first silk screen; 12. a second transmissive surface; 13. a first reflecting surface; 131. a second silk screen; 14. a second reflecting surface; 141. third silk screen printing; 15. a first side; 16. a second side; 17. cutting the section; 171. a first diaphragm; 172. a light transmission region; 18. a first chamfer; 19. a second chamfer; 2. a first prism; 3. a second prism; 4. a lens group; 41. a first lens; 42. a second lens; 43. a third lens; 44. a fourth lens; 5. a second diaphragm; 6. and (5) an imaging chip.
Detailed Description
The present application will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.
In the description of the present application, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present application that the device or element referred to must have a specific azimuth configuration and operation.
It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The application is further described below with reference to the accompanying drawings:
As shown in fig. 1 to 11, the present application provides an anti-stray light multi-fold prism, which includes a first transmission surface 11, a first reflection surface 13, a second reflection surface 14 and a cut surface 17, wherein the first reflection surface 13 and the second reflection surface 14 are located on a first side of the first transmission surface 11, the first reflection surface 13 and the second reflection surface 14 face opposite and incline to the first transmission surface 11, and it is understood that the included angles between the first reflection surface 13 and the second reflection surface 14 and the first transmission surface are smaller than 90 °, the first reflection surface 13 and the second reflection surface 14 can reflect the light emitted to the first reflection surface 13 and the second reflection surface 14 toward the first transmission surface 11 by inclining to the first transmission surface 11, the object side and the image side are located on a second side of the first transmission surface 11, the first transmission surface 11 is suitable for receiving the light emitted from the object side, the first reflection surface 13, the first transmission surface 11 and the second reflection surface 14 are suitable for reflecting the received light sequentially, and the first transmission surface 11 is suitable for reflecting the outgoing light.
In the embodiment shown in fig. 1, at least part of the split section 17 is formed with a light-transmitting area 172, the light-transmitting area 172 is suitable for allowing light to pass through, at least part of the split section 17 is formed with a first diaphragm 171, the first diaphragm 171 is suitable for limiting light to pass through, specifically, the first diaphragm 171 is suitable for blocking and shading stray light outside the light reflection path inside the multi-fold prism 1, so as to reduce the amount of stray light when the light leaves the interior of the multi-fold prism 1 and is incident on the image surface, and improve imaging quality.
In the embodiment shown in fig. 1, the main structure of the multifold prism 1 may be a trapezoidal prism, the first reflecting surface 13 and the second reflecting surface 14 are two waist sides of the trapezoidal prism, the first transmitting surface 11 is a lower bottom surface (a bottom surface with a larger area) of the trapezoidal prism, the second transmitting surface 12 is an upper bottom surface (a bottom surface with a smaller area) of the trapezoidal prism, the first side 15 is a front side of the trapezoidal prism, and the second side 16 is a rear side of the trapezoidal prism.
In the embodiment shown in fig. 1, the first side 15 and the second side 16 are parallel to each other, and the first transmissive surface 11 and the second transmissive surface 12 are parallel to each other.
In the embodiment shown in fig. 2, the included angle between the first reflecting surface 13 and the first transmitting surface 11 and the second reflecting surface 14 and the first transmitting surface 11 is θ,29 ° < θ < 32 °, and it should be understood by those skilled in the art that when the multi-refractive prism 1 is adopted, the size of the whole multi-refractive prism 1 can be determined by the included angle between the first reflecting surface 13 and the first transmitting surface 11 and the change of the included angle between the second reflecting surface 14 and the first transmitting surface 11, in addition to the size of the multi-refractive prism 1, the size of the first transmitting surface 11 can be affected, and thus the light passing amount of the whole optical system can be affected, and when the included angle is large, although the light passing amount can be increased, the size of the multi-refractive prism 1 can be increased relatively, therefore, by setting a proper included angle between the first reflecting surface 13 and the first transmitting surface 11 and the second reflecting surface 14 and the first transmitting surface 11, the size of the multi-refractive prism 1 can be ensured, and the whole multi-refractive prism 1 can be further controlled to be more compact, and the size of the multi-refractive prism can be better controlled, and the quality of the multi-refractive optical system can be better controlled, and the application can be better controlled to be more compact, and the size of the multi-refractive lens 171 can be better represented, and the quality can be better controlled.
In some embodiments, the material of the multifocal prism 1 is preferably glass, and the refractive index n substituted in the design is 1.5 n < 1.7, so as to ensure that the multifocal prism 1 has enough optical performance and is convenient for production and processing.
In general, in the glass materials on the market, the refractive index of crown glass K6 is 1.51110, the refractive index of crown glass K9 is 1.51630, the refractive index of dense crown glass ZK8 is 1.61400, the refractive index of flint glass F8 is 1.60551, the refractive index of heavy flint glass 2F1 is 1.64750, the refractive index of heavy flint glass 2F6 is 1.75500, the refractive index of barium flint glass BaF8 is 1.62590, the refractive index of heavy barium flint glass ZbaF is 1.65680, the refractive index n of the multi-fold prism 1 in design is limited according to the existing materials, so that the multi-fold prism 1 can be suitable for manufacturing and producing most of the manufacturable glass materials, thereby reducing the production cost and improving the manufacturability of the product.
In some embodiments, the multi-fold prism 1 may be an integrally formed structure, so that the light beam can obtain a better reflection effect inside the integrally formed multi-fold prism 1, but there is a problem that it is difficult to process and form, especially, process the first diaphragm 171.
In the embodiment shown in fig. 3, aiming at the problem of high processing difficulty of the integral multi-fold prism 1, the application also provides the multi-fold prism 1 with a split structure, which comprises a first prism 2 and a second prism 3, wherein the first prism 2 and the second prism 3 are suitable for combined connection, a cutting surface 17 is formed at the combined position of the first prism 2 and the second prism 3, a first diaphragm 171 is positioned at the combined position of the first prism 2 and the second prism 3, the multi-fold prism 1 with the split structure can be beneficial to adding the first diaphragm 171, and a light transmitting area 172 and the first diaphragm 171 can be formed after the combination of the first prism 2 and the second prism 3 only by preprocessing the combined position of the first prism 2 and the second prism 3, so that the processing difficulty and the processing cost are effectively reduced, and the processing efficiency is improved.
In some embodiments, the first prism 2 and the second prism 3 are glued at least in the light-transmitting area 172, and the light transmittance of the light-transmitting area 172 is ensured by gluing.
In some embodiments, the bonding portion between the first prism 2 and the second prism 3 is a flat bonding surface, and the first diaphragm 171 may be a part of the bonding surface without affecting the reflection of light.
It should be noted that, in order to ensure the reflection effect of the light in the split-type multi-fold prism 1, the glue at the glued portion needs to be transparent glue, in particular, the glue filled between the two prisms is transparent glue with high transmittance, and due to the relationship of high transmittance, the effect of the glue on the transmittance of the light can be minimized, but it is still required to ensure that the filling thickness of the glue is uniform enough, if the filling thickness of the glue is not uniform enough, the reflection path of the light may be changed, thereby causing optical errors such as curvature of field and dispersion of refraction deviation, and in addition, it is also required to note that the glued portion cannot be a transparent portion of the split-type multi-fold prism 1, and the glued portion overlaps with the transparent portion, which may cause optical errors.
In some embodiments, the multifocal prism 1 further includes a second transmission surface 12 located on the outside, the second transmission surface 12 is parallel to the first transmission surface 11, the cut surface 17 is perpendicular to the first transmission surface 11, the cut surface 17 is adapted to cut off the first transmission surface 11 and the second transmission surface 12, the light transmission area 172 is close to the first transmission surface 11, the first diaphragm 171 is close to the second transmission surface 12, the light transmission area 172 is located in an effective area of the multifocal prism 1 for light reflection, the first diaphragm 171 is located in an ineffective area of the multifocal prism 1 for light reflection, and the generation and passing of stray light are limited in the area, thereby reducing stray light during imaging, and the cut surface 17 is required to be cut off only at the second transmission surface 12 due to the presence of the first diaphragm 171 without affecting the surface integrity of the first reflection surface 13 and the second reflection surface 14.
It can be appreciated that the cut surface 17 is perpendicular to the first transmission surface 11, which can improve the combination accuracy between the first prism 2 and the second prism 3, effectively avoid the problem of forming accuracy caused by the combination of inclined surfaces between the first prism 2 and the second prism 3, and reduce the bonding area of the first prism 2 and the second prism 3, thereby avoiding more unexpected optical surfaces due to the increase of the bonding area and reducing the risk of parasitic light.
In some embodiments, the first prism 2 and the second prism 3 are hexahedral prisms with right trapezoid structures, and a plane in which the first diaphragm 171 is located and a plane in which the first transmission surface 11 is located are perpendicular to each other.
In the embodiment shown in fig. 2, the multifocal prism 1 includes a second transmissive surface 12, the second transmissive surface 12 is spaced apart from the first transmissive surface 11, a distance between the first transmissive surface 11 and the second transmissive surface 12 is d, and a ratio between a length a of the first diaphragm 171 and the distance d satisfies the following formula:
0.6<a/d<0.7；
the length a of the first diaphragm 171 is within this ratio range, and a good effect of eliminating the multiple reflection stray light in the multifocal prism 1 can be obtained.
In some embodiments, the first diaphragm 171 is a lithography diaphragm, the thickness of the first diaphragm 171 is less than 0.02mm, and the specific thickness of the first diaphragm 171 is mainly obtained according to lithography process and flare simulation, and when the thickness is less than 0.02mm, a better effect of eliminating multiple reflection flare in the multifocal prism 1 can be obtained.
In the embodiment shown in fig. 1, the multifocal prism 1 further includes a second transmission surface 12, a first side surface 15 and a second side surface 16, the second transmission surface 12 is spaced apart from the first transmission surface 11, a distance between the first transmission surface 11 and the second transmission surface 12 is d, the first side surface 15 and the second side surface 16 are spaced apart, a distance between the first side surface 15 and the second side surface 16 is h, and a ratio of the distance d to the distance h satisfies the following formula:
0.3＜d/h＜0.6；
the distance d and the distance h are in the range of the ratio, so that a good light transmission effect can be achieved, and meanwhile, the compactness of the structure can be guaranteed.
In some embodiments, the first reflecting surface 13 and the second reflecting surface 14 are respectively engaged with two ends of the first transmitting surface 11 in a matching manner, a first chamfer 18 is provided at the engagement position of the first reflecting surface 13 and the first transmitting surface 11, a second chamfer 19 is provided at the engagement position of the second reflecting surface 14 and the first transmitting surface 11, the first chamfer 18 and the second chamfer 19 are used for ensuring the structural strength of the corner position of the multi-fold prism 1, if no chamfer is provided, the corner position of the multi-fold prism 1 formed by two planes is smaller in thickness and more easily subjected to larger pressure, thereby increasing the risk of cracking the corner structure of the multi-fold prism 1, and effectively reducing the risk by providing the first chamfer 18 and the second chamfer 19.
In some embodiments, the tangential plane of the first chamfer 18 is perpendicular to the first transmission surface 11, the tangential plane of the second chamfer 19 is perpendicular to the first transmission surface 11, the height of the first chamfer 18 is larger than the height of the second chamfer 19, and because the tangential planes of the first chamfer 18 and the second chamfer 19 increase the risk of stray light, the second chamfer 19 close to the imaging chip 6 side is preferably reduced in consideration of this situation, so that the stray light of the first transmission surface 11 of the multifocal prism 1 is reduced, and because the first transmission surface 11 is closer to the imaging chip 6, the risk of stray light between the first transmission surface 11 and the imaging chip 6 can be reduced, thereby greatly improving the stray light influence of the imaging lens.
In some embodiments, the ratio x 1 between the height of the first corner 18 and the length of the first transmissive surface 11 is 0.02 < x 1 < 0.06, where the junction between the first reflective surface 13 and the first transmissive surface 11 can obtain higher structural strength and better effect of eliminating parasitic light.
In some embodiments, the ratio x 2 between the height of the second chamfer 19 and the length of the first transmissive surface 11 is 0.01 < x 2 < 0.06, and in this ratio range, the junction between the second reflective surface 14 and the first transmissive surface 11 can obtain higher structural strength and better effect of eliminating parasitic light.
In the embodiment shown in fig. 4, the first silk screen 111 is disposed around the first transmission surface 11, when looking at the first transmission surface 11, the main body of the first silk screen 111 is a rectangular frame, in the first direction (x-axis direction), the ratio x 3 of the width of the single-side first silk screen 111 to the width of the first transmission surface 11 is 0.18 < x 3 < 0.4, and in the second direction (y-axis direction), the ratio x 4 of the width of the single-side first silk screen 111 to the length of the first transmission surface 11 is 0.03 < x 4 < 0.1, so that the incident stray light at the edge of the first transmission surface 11 can be reduced or even eliminated, and the imaging quality is improved.
In the embodiment shown in fig. 5, the first reflective surface 13 is provided with the second silk screen 131 at the edge connected to the first transmissive surface 11 and the edges at two adjacent sides, when looking at the first reflective surface 13, the second silk screen 131 is in an n-shaped frame, the ratio x 5 of the width of the single-sided second silk screen 131 to the width of the first reflective surface 13 in the first direction (x-axis direction) is 0.25 < x 5 < 0.315, and the ratio x 6 of the width of the second silk screen 131 to the length of the first reflective surface 13 in the second direction (y-axis direction) is 0.11 < x 6 < 0.22, so that the incident stray light at the edge of the first transmissive surface 11 and the reflected stray light between the first reflective surface 13 and the first side surface 15 and the second side surface 16 can be reduced or even eliminated.
In the embodiment shown in fig. 6, the second reflective surface 14 is provided with the third silk screen 141 at the edge connected to the first transmissive surface 11 and the edges on two adjacent sides, when looking at the second reflective surface 14, the third silk screen 141 is shaped as a u-shaped frame, the ratio x 7 of the width of the third silk screen 141 on one side to the width of the second reflective surface 14 in the first direction (x-axis direction) is 0.19 < x 7 < 0.3, and the ratio x 8 of the width of the third silk screen 141 to the length of the second reflective surface 14 in the second direction (y-axis direction) is 0.14 < x 8 < 0.18, so that the incident stray light on the edge of the first transmissive surface 11 and the reflected stray light between the second reflective surface 14 and the first side 15 and the second side 16 can be reduced or even eliminated.
It will be appreciated that the first screen print 111 on the first transmission surface 11, the second screen print 131 on the first reflection surface 13, and the third screen print 141 on the second reflection surface 14 can effectively eliminate stray light, and the larger the area, the better the effect of eliminating stray light, but the sizes of the first screen print 111, the second screen print 131, and the third screen print 141 affect the transmission and reflection areas of light, and further affect the light transmission amount, and the large aperture and the large light transmission amount are one of the important requirements of the present user, so that the areas of the first screen print 111, the second screen print 131, and the third screen print 111 are not preferable for reducing the generation of stray light, and in addition, in order to obtain a larger aperture under the background of the requirement of a long focal length, if the focal length is reduced, although the focal length is increased, the focal length is shortened to result in failing to meet the requirement of the long-focus shooting of the user.
An optical lens includes an optical system composed of a lens group 4 and a second diaphragm 5 (preferably an aperture diaphragm is used), a multifocal prism 1 of any one of the above, and an imaging chip 6, and a ratio α of a distance from a center line of the optical system to a center line of the imaging chip 6 to a focal length range of the lens group 4 satisfies the following equation:
13/23＜α＜13/18。
The distance between the center line of the optical system and the center line of the imaging chip 6 determines the width of the lens module, and the number of times and the distance of the light reflected by the multifocal prism 1 can be roughly determined by the width of the lens module, so that the ratio alpha of the distance between the center line of the optical system and the center line of the imaging chip 6 to the focal length range of the lens group 4 can be set to determine whether the space for compressing the light by the multifocal prism 1 is large or small.
In some embodiments, the center line of the lens group 4 is the center line of the optical system.
In particular, in a preferred embodiment of the application, the lens group 4 comprises at least four lenses, the focal length of the lens group 4 being in the range 18mm to 23mm, in particular less than 13mm, between the centre line of the lens group 4 and the centre line of the imaging chip 6.
In some embodiments, the optical system field of view has an axis value greater than 0.5.
In some embodiments, the F-number of the lens group 4 satisfies the following formula:
2.8＜F＜3.5。
In some embodiments, the ratio β of the length of the first transmissive surface 11 to the focal length of the lens group 4 satisfies the following equation:
0.8＜β＜1.0。
in some embodiments, the multifocal prism 1 further comprises a first side 15 and a second side 16, the first side 15 and the second side 16 being spaced apart, a spacing h between the first side 15 and the second side 16, the ratio of the spacing h to the diameter b of the largest lens in the lens group 4 satisfying the following formula:
0.6＜h/b＜1.0。
In some embodiments, the ratio between the clear aperture of the first diaphragm 171 and the clear aperture of the second diaphragm 5 is greater than 2 and less than 4, the first diaphragm 171 is a stray light eliminating diaphragm, and the basic principle of stray light reduction by the stray light eliminating diaphragm is as follows: under the input of the off-angle light, in the area of the element for preventing stray light, it is to be ensured that light cannot pass through and cannot itself be used as an element for generating stray light, and obviously, the first diaphragm 171 needs to ensure that the aperture for passing through is large, but the first diaphragm 171 cannot be larger than the aperture for passing through of the opposite light of the multifold prism 1, that is, the first diaphragm 171 cannot be larger than the area of the parallel area of the opposite light of the multifold prism 1, and according to the above limitation, the ratio of the aperture for passing through of the first diaphragm 171 and the second diaphragm 5 can be obtained, and in the range of the ratio, the arrangement of the first diaphragm 171 is relatively reasonable, and the ineffective area of the excessive multifold prism 1 is not increased, and the lens module height is not made high.
In the embodiment shown in fig. 8 and 9, the area of the inclined plane of the multifocal prism 1 determines the area of the multifocal prism 1 for realizing reflection, if the inclined plane is too large, the area of the reflecting surface is determined to be large, the angle of the inclined plane is large (relative angle to the optical axis), so that the prism is required to move upwards, and the width is increased to meet the requirement of reflecting the outgoing light rays of the same lens, obviously, the area is too large to be matched with the outgoing range of the front lens, so that an ineffective area is increased, no obvious light treatment is performed in the ineffective area, more stray light risks are caused, and unexpected light rays are still concentrated in the ineffective area of the prism, so that stray light occurs.
In the embodiment shown in fig. 8 and 10, the area of the inclined plane of the multifocal prism 1 determines the area of reflection achieved by the multifocal prism 1, and if the inclined plane is too small, the inclined plane angle (the angle relative to the optical axis) is small, so that the prism needs to be moved down to meet the requirement of reflecting the outgoing light of the same lens, which obviously increases the overall height of the optical lens (the outgoing light of the lens is approximately converged), so that the volume of the optical lens is too large.
In some embodiments, the second diaphragm 5 is disposed in the direction of the lens group 4 near the object side, and the lens in the lens group 4 gradually decreases from the object side to the image side.
In some embodiments, the lens group 4 needs to include at least one lens to perform its function.
In the embodiment shown in fig. 7, the lens group 4 includes a first lens element 41, a second lens element 42, a third lens element 43 and a fourth lens element 44, wherein the first lens element 41 has a positive refractive power, which contributes to compressing the volume of the object-side end of the imaging system lens element, the second lens element 42 has a positive refractive power, which balances the refractive power distribution of the first lens element 41 and the third lens element 43, so that excessive aberrations can be avoided during compressing the volume, and thus a balance can be achieved between the length of the compressed lens element and the quality of the condensing lens element, the third lens element 43 has a negative refractive power, which balances aberrations such as spherical aberration generated by the compressed volume, and the fourth lens element 44 has a negative refractive power, which balances aberrations such as spherical aberration generated by the compressed volume.
In the embodiment shown in fig. 11, the second diaphragm 5 is disposed in the object side direction of the first lens 41, so that the optical size of the first lens 41 > the optical size of the second lens 42 > the optical size of the third lens 43 > the optical size of the fourth lens 44, so as to ensure that the optical lens has a structure size gradually decreasing from the object side to the image side, so that the structure of the optical lens has a larger head, and as the arrangement of the multifocal prism 1 needs to occupy a certain space, the overall size of the optical lens needs to be considered in combination with the lens group 4 and the multifocal prism 1, by optimizing the overall volume distribution of the lens group 4, the volume distribution can be more uniform, and the problem that the volume of the tail of the optical lens is excessively large due to the superposition of the multifocal prism 1 and the lens group 4 is reduced, thereby reducing the shoulder height J of the image pickup module (i.e., the shoulder height of the image pickup module, the height J of the image pickup module is the height dimension of the cover plate of the mobile phone, and the thickness of the cover plate of the mobile phone can be influenced).
In some embodiments, the object-side surface of the first lens element 41 is convex, the image-side surface of the second lens element 42 is concave, the object-side surface of the third lens element 43 is concave, the image-side surface of the fourth lens element 44 is convex, and the image-side surface of the fourth lens element 44 is concave.
In some embodiments, the object-side surface of the fourth lens element 44 has a convex surface at the paraxial region, and the object-side surface of the fourth lens element 44 has at least one inflection point, so that the incident angle of light on the imaging surface can be adjusted, the angle of peripheral light can be controlled, the dark angle around the image can be avoided, petzval, field (Petzval Field) can be improved, and distortion can be effectively reduced.
In some embodiments, the image side of the fourth lens element 44 is concave, and the image side surface of the fourth lens element 44 has a shape matching with the shape of the object side surface to maintain the shape of the fourth lens element 44 for reducing the molding difficulty and improving the manufacturing yield.
The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.
Claims (17)
1. The utility model provides a stray light eliminating multi-fold prism which is characterized in that: the light-transmitting device comprises a first transmission surface, a first reflection surface, a second reflection surface and a cutting surface, wherein the first transmission surface, the first reflection surface, the second reflection surface and the cutting surface are positioned outside, the first reflection surface and the second reflection surface are positioned on a first side of the first transmission surface, the included angles between the first reflection surface, the second reflection surface and the first transmission surface are smaller than 90 degrees, at least part of the cutting surface is provided with a light-transmitting area, the light-transmitting area is suitable for enabling light to pass through, at least part of the cutting surface is provided with a first diaphragm, and the first diaphragm is suitable for limiting the light to pass through.
2. A stray light removing multi-fold prism as defined in claim 1, wherein: the multi-prism comprises a first prism and a second prism, the first prism and the second prism are suitable for combination connection, the combination position forms the cutting surface, and the first prism and the second prism are at least in the light transmission area for glue connection.
3. A stray light removing multi-fold prism as defined in claim 1, wherein: the included angle between the first reflecting surface and the first transmitting surface and the included angle between the second reflecting surface and the first transmitting surface are theta, and the theta is more than 29 degrees and less than 32 degrees.
4. A stray light removing multi-fold prism as defined in claim 1, wherein: the first diaphragm is a photoetching diaphragm, and the thickness of the first diaphragm is smaller than 0.02mm.
5. A stray light removing multi-fold prism as defined in claim 1, wherein: the first reflecting surface and the second reflecting surface are respectively matched and connected with two ends of the first transmitting surface, a first chamfer is arranged at the joint of the first reflecting surface and the first transmitting surface, the tangent plane of the first chamfer is perpendicular to the first transmitting surface, a second chamfer is arranged at the joint of the second reflecting surface and the first transmitting surface, the tangent plane of the second chamfer is perpendicular to the first transmitting surface, and the height of the first chamfer is larger than that of the second chamfer.
6. A stray light removing multi-fold prism as defined in claim 5, wherein: the ratio x 1 between the height of the first chamfer and the length of the first transmission face is 0.02 < x 1 < 0.06; the ratio x 2 between the height of the second chamfer and the length of the first transmissive surface is 0.01 < x 2 < 0.06.
7. A stray light removing multi-fold prism as defined in claim 1, wherein: the first silk screen printing is arranged on the periphery of the first transmission surface, the ratio x 3 of the width of the first silk screen printing on one side to the width of the first transmission surface is 0.18 < x 3 < 0.4 in the first direction, and the ratio x 4 of the width of the first silk screen printing on one side to the length of the first transmission surface is 0.03 < x 4 < 0.1 in the second direction.
8. A stray light removing multi-fold prism as defined in claim 1, wherein: the first reflection surface is provided with second silk screen printing at the connecting edge with the first transmission surface and the edges at the two adjacent sides, the ratio x 5 of the width of the second silk screen printing on one side to the width of the first reflection surface is more than 0.25 and less than 5 and less than 0.315 in the first direction, and the ratio x 6 of the width of the second silk screen printing to the length of the first reflection surface is more than 0.11 and less than 6 and less than 0.22 in the second direction.
9. A stray light removing multi-fold prism as defined in claim 1, wherein: the second reflection surface is provided with third silk screen printing at the connecting edge with the first transmission surface and the edges at the two adjacent sides, the ratio x 7 of the width of the third silk screen printing on one side to the width of the second reflection surface is more than 0.19 and less than 7 and less than 0.3 in the first direction, and the ratio x 8 of the width of the third silk screen printing to the length of the second reflection surface is more than 0.14 and less than 8 and less than 0.18 in the second direction.
10. A stray light removing multi-fold prism as defined in any one of claims 1 to 9, wherein: the object side and the image side are located on the second side of the first transmission surface, the first transmission surface is suitable for receiving at least part of light rays emitted from the object side, the first reflection surface, the first transmission surface and the second reflection surface are suitable for reflecting at least part of received light rays in sequence, the first transmission surface is suitable for emitting at least part of reflected light rays to the image side, the multi-fold prism further comprises a second transmission surface located on the outside, the second transmission surface is parallel to the first transmission surface, the cutting surface is perpendicular to the first transmission surface, the cutting surface is suitable for cutting off the first transmission surface and the second transmission surface, the light transmission area is close to the first transmission surface, and the first diaphragm is close to the second transmission surface.
11. A stray light removing multi-fold prism as defined in claim 10, wherein: the distance between the first transmission surface and the second transmission surface is d, and the ratio between the length a of the first diaphragm and the distance d satisfies the following formula:
0.6< a/d < 0.7。
12. A stray light removing multi-fold prism as defined in claim 10, wherein: the multi-fold prism further comprises a first side face and a second side face which are positioned outside, the second transmission face is arranged at intervals with the first transmission face, the distance between the first transmission face and the second transmission face is d, the first side face and the second side face are arranged at intervals, the distance between the first side face and the second side face is h, and the ratio of the distance d to the distance h satisfies the following formula:
0.3＜d/h＜0.6。
13. An optical lens, characterized in that: an optical system comprising a lens group and a second diaphragm, a multifocal prism according to any one of claims 1 to 12, and an imaging chip, wherein the ratio α of the distance from the center line of the optical system to the center line of the imaging chip to the focal length range of the lens group satisfies the following formula:
13/23＜α＜13/18。
14. an optical lens as claimed in claim 13, wherein: the ratio β of the length of the first transmission surface to the focal length of the lens group satisfies the following formula:
0.8＜β＜1.0。
15. an optical lens as claimed in claim 13, wherein: the multi-fold prism further comprises a first side face and a second side face, the first side face and the second side face are arranged at intervals, the distance between the first side face and the second side face is h, and the ratio of the distance h to the diameter b of the largest lens in the lens group meets the following formula:
0.6＜h/b＜1.0。
16. An optical lens as claimed in claim 13, wherein: the ratio between the clear aperture of the first diaphragm and the clear aperture of the second diaphragm is greater than 2 and less than 4.
17. An optical lens as claimed in claim 13, wherein: the second diaphragm is arranged in the direction of the lens group close to the object side, and the size of the lens in the lens group gradually reduces from the object side to the image side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410397682.8A CN117991425B (en) | 2024-04-03 | 2024-04-03 | Stray light eliminating multi-fold prism and optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410397682.8A CN117991425B (en) | 2024-04-03 | 2024-04-03 | Stray light eliminating multi-fold prism and optical lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117991425A true CN117991425A (en) | 2024-05-07 |
| CN117991425B CN117991425B (en) | 2024-06-11 |
Family
ID=90887776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410397682.8A Active CN117991425B (en) | 2024-04-03 | 2024-04-03 | Stray light eliminating multi-fold prism and optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117991425B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10221511A (en) * | 1996-12-04 | 1998-08-21 | Asahi Optical Co Ltd | Prism and visual optical system using prism |
| CN102981275A (en) * | 2012-10-30 | 2013-03-20 | 泉州师范学院 | Optical system for generating approximate non- diffracted ray structure light |
| CN106324730A (en) * | 2016-09-18 | 2017-01-11 | 北京杰福科技有限公司 | Prism and glass surface stress test device |
| US20220091373A1 (en) * | 2020-09-24 | 2022-03-24 | Apple Inc. | Optical System for Telephoto Cameras |
| CN115327747A (en) * | 2022-09-09 | 2022-11-11 | 昆山丘钛微电子科技股份有限公司 | Zoom optical system, camera module and electronic equipment |
| CN219370111U (en) * | 2022-07-01 | 2023-07-18 | 昆山丘钛微电子科技股份有限公司 | Optical imaging system, camera module and electronic equipment |
| CN117270292A (en) * | 2023-09-26 | 2023-12-22 | 昆山丘钛微电子科技股份有限公司 | Light path folding prism, camera module and electronic equipment |
| CN220399783U (en) * | 2023-07-04 | 2024-01-26 | 昆山丘钛微电子科技股份有限公司 | Light conversion prism, camera module and intelligent wearing equipment |
| CN117518404A (en) * | 2023-11-09 | 2024-02-06 | Oppo广东移动通信有限公司 | Optical imaging system, camera module and electronic equipment |
| CN117631210A (en) * | 2022-08-09 | 2024-03-01 | 大立光电股份有限公司 | Folding optical system, image capturing device and electronic device |
-
2024
- 2024-04-03 CN CN202410397682.8A patent/CN117991425B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10221511A (en) * | 1996-12-04 | 1998-08-21 | Asahi Optical Co Ltd | Prism and visual optical system using prism |
| CN102981275A (en) * | 2012-10-30 | 2013-03-20 | 泉州师范学院 | Optical system for generating approximate non- diffracted ray structure light |
| CN106324730A (en) * | 2016-09-18 | 2017-01-11 | 北京杰福科技有限公司 | Prism and glass surface stress test device |
| US20220091373A1 (en) * | 2020-09-24 | 2022-03-24 | Apple Inc. | Optical System for Telephoto Cameras |
| CN219370111U (en) * | 2022-07-01 | 2023-07-18 | 昆山丘钛微电子科技股份有限公司 | Optical imaging system, camera module and electronic equipment |
| CN117631210A (en) * | 2022-08-09 | 2024-03-01 | 大立光电股份有限公司 | Folding optical system, image capturing device and electronic device |
| CN115327747A (en) * | 2022-09-09 | 2022-11-11 | 昆山丘钛微电子科技股份有限公司 | Zoom optical system, camera module and electronic equipment |
| CN220399783U (en) * | 2023-07-04 | 2024-01-26 | 昆山丘钛微电子科技股份有限公司 | Light conversion prism, camera module and intelligent wearing equipment |
| CN117270292A (en) * | 2023-09-26 | 2023-12-22 | 昆山丘钛微电子科技股份有限公司 | Light path folding prism, camera module and electronic equipment |
| CN117518404A (en) * | 2023-11-09 | 2024-02-06 | Oppo广东移动通信有限公司 | Optical imaging system, camera module and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117991425B (en) | 2024-06-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20130057971A1 (en) | Panoramic imaging lens and panoramic imaging system using the same | |
| US8755131B2 (en) | Optical lens assembly for capturing images and image capture device therewith | |
| TWI417638B (en) | A projector with reduced size and higher contrast | |
| TWI494590B (en) | An optical imaging lens and an electronic device to which the optical imaging lens is applied | |
| CN111290100B (en) | Projection lens and projection imaging system | |
| US9784956B2 (en) | Wide-angle projection system | |
| TWI418916B (en) | Projection apparatus | |
| US8054541B2 (en) | Fixed-focus lens | |
| WO2022068709A1 (en) | Photographing apparatus and electronic device | |
| CN115657275A (en) | Ultra-short-focus projection lens and projection system | |
| US8228611B2 (en) | Lens module | |
| CN110568584A (en) | 4K high-resolution panoramic annular belt optical system | |
| CN114114645B (en) | Optical lens, camera module and electronic equipment | |
| WO2022179632A1 (en) | Telephoto lens, camera module, and electronic device | |
| WO2021114782A1 (en) | Compact telephoto lens | |
| CN117991425B (en) | Stray light eliminating multi-fold prism and optical lens | |
| US20160216495A1 (en) | Projection lens | |
| WO2023231111A1 (en) | Projection lens and projection device | |
| CN114222054A (en) | Camera module and electronic equipment | |
| CN114924457A (en) | Ultrashort burnt optical system and projection equipment | |
| CN210776005U (en) | Projection lens | |
| CN212160213U (en) | Optical imaging lens and electronic device | |
| CN111381347B (en) | Lens assembly and imaging device | |
| CN114002814A (en) | Optical lens, camera module and electronic equipment | |
| KR101005757B1 (en) | Projection lens unit for pico projector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |