CN108681183B - Reverse gradual change mirror - Google Patents
Reverse gradual change mirror Download PDFInfo
- Publication number
- CN108681183B CN108681183B CN201810581454.0A CN201810581454A CN108681183B CN 108681183 B CN108681183 B CN 108681183B CN 201810581454 A CN201810581454 A CN 201810581454A CN 108681183 B CN108681183 B CN 108681183B
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- reverse
- mirror
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- curve
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- 238000002834 transmittance Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims description 12
- 230000000750 progressive effect Effects 0.000 claims description 9
- 230000035515 penetration Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004040 coloring Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003086 colorant Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
- G03B11/04—Hoods or caps for eliminating unwanted light from lenses, viewfinders or focusing aids
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Eye Examination Apparatus (AREA)
Abstract
The invention belongs to the technical field of accessories of cameras, and particularly relates to a reverse gradual change mirror, wherein the long side length L of the reverse gradual change mirror is divided into n equal parts in the long side direction of the reverse gradual change mirror, and the trend of a transmittance numerical curve gradually rises from a boundary point O to two sides under the condition of light with the same wavelength; dividing the transmittance numerical curve S into two sections of curves S1 and S2 by taking the boundary point O as a breakpoint; the slope of the curve S1 is K1, the slope of the curve S2 is K2, and K1< K2. The reverse gradual change mirror of the invention is softened in the process of shallowing from the deepest to the two sides; the colored black portion is lengthened; the effect of taking the photo is more natural, and the level of color change is smoother; the layering of the colors is more coordinated and natural; the reverse graded mirror of the invention can be stacked, and when two reverse graded mirrors of the invention are used for stacking, areas with different concentrations are combined, and the reverse graded mirror can be stacked in any direction along the lens, which is equivalent to the effect of changing different ND lens levels.
Description
Technical Field
The invention belongs to the technical field of accessories of cameras, and particularly relates to a reverse gradient mirror.
Background
When outdoor shooting, the modes of light rays transmitted by the sky and reflected by the ground are different when entering the camera, namely the light ray reflectivities of the sky and the ground are quite different in many cases, and due to the limited latitude of the photosensitive assembly of the camera, normal exposure pictures of the sky and the ground can not be shot at the same time. If the sky exposure is accurate, the ground will be underexposed and turn into a black; to accurately expose the ground, the sky is overexposed and becomes dead white. Especially in cloudy, sunrise and sunset, the problem of the difference in reflectivity between the sky and the ground is more serious. In this environment, the layers of the sky and the ground in the photo can be completely reproduced by adding the gradual change mirror.
The current reverse gradient lens generally needs to exchange different ND lenses (namely, a middle gray density lens belongs to the reverse gradient lens) according to different photographing conditions, and if the photographing requirement cannot be met, a mode of stacking ND lenses can be adopted. After the ND lenses in the current market are stacked, the black part of the lenses changes sharply, and the photographed middle area is most likely to have a fault phenomenon, so that a bad effect is achieved. The reason for this is that the colored portion of the existing ND lens occupies a small proportion of the entire lens length, and the light transmittance span per unit length of the colored portion is large.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a novel inverse progressive mirror.
A reverse gradation mirror, in the longitudinal direction thereof, with one edge as a start end, denoted as T0, and the other edge as a stop end, denoted as Tx; the distance from T0 to Tx is the length of the long side of the reverse graded mirror, denoted as L; dividing the length L of the long side of the reverse gradient mirror into n equal parts, detecting the transmittance of the reverse gradient mirror at each detection point under the condition of light with the same wavelength under the conditions that the distance between the reverse gradient mirror and the starting point T0 is (L/n) 1, (L/n) 2, (L/n) 3 … … and so on until the position of the reverse gradient mirror is (L/n) n as the detection point, and recording the numerical value of the transmittance;
Taking the distance between T0 and each detection point (the distance (L/n) from the starting point T0 is 1, (L/n) 2, (L/n) 3 … … and so on until the length of (L/n) is taken as the horizontal axis, taking the transmittance as the vertical axis, and obtaining a transmittance numerical curve which is marked as S; taking the lowest point of the transmittance numerical curve S as a boundary point, and marking as O; the trend of the curve gradually rises from the boundary point O to two sides; dividing the transmittance numerical curve S into two sections of curves S1 and S2 by taking the boundary point O as a breakpoint; the slope of the curve S1 is K1, the slope of the curve S2 is K2, and K1< K2.
The length from the boundary point O to the T0 direction is L1, and the rising trend of the curve S1 is stable.
The length from the boundary point O to the Tx direction is L2, and the curve S2 rises smoothly.
Wherein the length of L1 accounts for 50-60% of the total lens length of the reverse gradient lens, and preferably the length of L1 accounts for 55% of the total lens length of the reverse gradient lens.
The L2 length is 40-50% of the total lens length of the inverse progressive lens, preferably the L2 length is 45% of the total lens length of the inverse progressive lens.
The light is visible light with the wavelength of 350-700 nm.
The coloring of the Tx end is shallowest; the transmission rate of the Tx end accounting for 7% -13% of the total length of the reverse gradient mirror is more than or equal to 90%.
The penetration rate of the T0 end accounting for 7% -13% of the total length of the reverse gradient lens is 50% -52%.
The reverse gradient mirror of the invention has the following beneficial effects:
The reverse gradual change mirror of the invention is softened in the process of shallowing from the deepest to the two sides; the colored black portion is lengthened; the effect of taking the photo is more natural, and the level of color change is smoother; the layering of the colors is more coordinated and natural;
The reverse graded mirror of the invention can be stacked, and when two reverse graded mirrors of the invention are used for stacking, areas with different concentrations are combined, and the reverse graded mirror can be stacked in any direction along the lens, which is equivalent to the effect of changing different ND lens levels.
The range of recording is narrower and the loss is compensated compared with the human eyes, and the reverse gradient lens can be applied to a wide-angle camera.
Drawings
Fig. 1 is a graph of the transmittance of a reverse graded mirror in a prior art design through 350 wavelength visible light detection.
Fig. 2 is a graph of the transmittance of the reverse graded mirror of the present invention through 350 wavelength visible light detection.
Detailed Description
The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
A reverse gradation mirror, in the longitudinal direction thereof, with one edge as a start end, denoted as T0, and the other edge as a stop end, denoted as Tx; the distance from T0 to Tx is the length of the long side of the reverse graded mirror, denoted as L; dividing the length L of the long side of the reverse gradient mirror into n equal parts, detecting the transmittance of the reverse gradient mirror at each detection point under the condition of light with the same wavelength under the conditions that the distance between the reverse gradient mirror and the starting point T0 is (L/n) 1, (L/n) 2, (L/n) 3 … … and so on until the position of the reverse gradient mirror is (L/n) n as the detection point, and recording the numerical value of the transmittance;
Taking the distance between T0 and each detection point (the distance (L/n) from the starting point T0 is 1, (L/n) 2, (L/n) 3 … … and so on until the length of (L/n) is taken as the horizontal axis, taking the transmittance as the vertical axis, and obtaining a transmittance numerical curve which is marked as S; taking the lowest point of the transmittance numerical curve S as a boundary point, and marking as O; the trend of the curve gradually rises from the boundary point O to two sides; dividing the transmittance numerical curve S into two sections of curves S1 and S2 by taking the boundary point O as a breakpoint; the slope of the curve S1 is K1, the slope of the curve S2 is K2, and K1< K2.
The length from the boundary point O to the T0 direction is L1, and the rising trend of the curve S1 is stable.
The length from the boundary point O to the Tx direction is L2, and the curve S2 rises smoothly.
Wherein the length of L1 accounts for 50-60% of the total lens length of the reverse gradient lens, and preferably the length of L1 accounts for 55% of the total lens length of the reverse gradient lens.
The L2 length is 40-50% of the total lens length of the inverse progressive lens, preferably the L2 length is 45% of the total lens length of the inverse progressive lens.
The light is visible light with the wavelength of 350-700 nm.
The coloring of the Tx end is shallowest; the transmission rate of the Tx end accounting for 7% -13% of the total length of the reverse gradient mirror is more than or equal to 90%. The colored portion refers to a macroscopic black area on the lens. The colored part accounts for 87% -93% of the total length of the reverse gradient mirror. (in this embodiment, the transmissivity of the region where the Tx end accounts for 10% of the total length of the reverse gradation mirror is 90% or more, that is, the colored portion accounts for 90% of the total length of the reverse gradation mirror.)
The penetration rate of the T0 end accounting for 7% -13% of the total length of the reverse gradient lens is 50% -52%. (in this embodiment, the transmittance of the region where the T0 end occupies 10% of the total length of the reverse gradient lens is 51%).
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
1. A reverse gradation mirror, characterized by: in the long side direction, the edge of one side is taken as a starting end and is marked as T0, and the edge of the other side is taken as a terminating end and is marked as Tx; the distance from T0 to Tx is the length of the long side of the reverse graded mirror, denoted as L; dividing the length L of the long side of the reverse gradient mirror into n equal parts, performing penetration rate detection on the reverse gradient mirror at each detection point under the condition of light with the same wavelength by using the positions of L/n equal parts, which are the same as the positions of the starting points T0, L/n equal to 1, L/n equal to 2 and L/n equal to 3 … … as detection points, and recording the numerical value of the penetration rate;
The distance from T0 to each detection point and the distances L/n 1, L/n 2 and L/n 3 … … from the starting point T0 are similar, the length up to L/n is taken as the horizontal axis, the penetration rate is taken as the vertical axis, and a penetration rate numerical curve is obtained and is marked as S; taking the lowest point of the transmittance numerical curve S as a boundary point, and marking as O; the trend of the curve gradually rises from the boundary point O to two sides; dividing the transmittance numerical curve S into two sections of curves S1 and S2 by taking the boundary point O as a breakpoint; the slope of the curve S1 is K1, the slope of the curve S2 is K2, and K1 is less than K2.
2. A reverse taper mirror according to claim 1, wherein the length from the boundary point O to the T0 direction is L1, and the curve S1 rises smoothly.
3. A reverse gradation mirror according to claim 1, wherein the length from the boundary point O to the Tx direction is L2, and the curve S2 has a smooth upward trend.
4. A reverse progressive mirror according to claim 2 wherein L1 has a length of 50 to 60% of the total lens length of the reverse progressive mirror.
5. A reverse taper mirror according to claim 4, wherein L1 has a length of 55% of the total lens length of the reverse taper mirror.
6. A reverse taper mirror according to claim 3, wherein the L2 length is 40-50% of the total lens length of the reverse taper mirror.
7. The inverse progressive mirror of claim 6 wherein L2 length is 45% of the total lens length of the inverse progressive mirror.
8. A reverse graded mirror according to claim 1, wherein the light is visible light with a wavelength of 350-700 nm.
9. A reverse taper mirror according to claim 1, wherein the coloring of the Tx end is shallowest; the transmission rate of the Tx end accounting for 7% -13% of the total length of the reverse gradient mirror is more than or equal to 90%.
10. A reverse taper mirror according to claim 1, wherein the T0 end has a transmittance of 50% to 52% in a region of 7% to 13% of the total length of the reverse taper mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810581454.0A CN108681183B (en) | 2018-06-07 | 2018-06-07 | Reverse gradual change mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810581454.0A CN108681183B (en) | 2018-06-07 | 2018-06-07 | Reverse gradual change mirror |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108681183A CN108681183A (en) | 2018-10-19 |
| CN108681183B true CN108681183B (en) | 2024-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810581454.0A Active CN108681183B (en) | 2018-06-07 | 2018-06-07 | Reverse gradual change mirror |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108681183B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6188522B1 (en) * | 1999-09-24 | 2001-02-13 | Matsushita Electric Industrial Co., Ltd. | Projection lens and projector using the same |
| CN107065220A (en) * | 2017-03-30 | 2017-08-18 | 温州医科大学 | The personalized free form surface gradual change mirror design method of picture frame matching optimization |
| CN207114996U (en) * | 2017-09-06 | 2018-03-16 | 惠州璀璨光影技术有限公司 | A kind of camera lens filter fixed using rand pressing mode |
| CN208752367U (en) * | 2018-06-07 | 2019-04-16 | 玉环市环宇光学仪器股份有限公司 | A kind of reversed gradual change mirror |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101016018B1 (en) * | 2010-02-18 | 2011-02-23 | 주식회사 세코닉스 | Projection lens unit for pico projector |
-
2018
- 2018-06-07 CN CN201810581454.0A patent/CN108681183B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6188522B1 (en) * | 1999-09-24 | 2001-02-13 | Matsushita Electric Industrial Co., Ltd. | Projection lens and projector using the same |
| CN107065220A (en) * | 2017-03-30 | 2017-08-18 | 温州医科大学 | The personalized free form surface gradual change mirror design method of picture frame matching optimization |
| CN207114996U (en) * | 2017-09-06 | 2018-03-16 | 惠州璀璨光影技术有限公司 | A kind of camera lens filter fixed using rand pressing mode |
| CN208752367U (en) * | 2018-06-07 | 2019-04-16 | 玉环市环宇光学仪器股份有限公司 | A kind of reversed gradual change mirror |
Non-Patent Citations (1)
| Title |
|---|
| 中灰渐变镜;沛然;;影像视觉(第11期);全文 * |
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| Publication number | Publication date |
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| CN108681183A (en) | 2018-10-19 |
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