CN113310027B - Lens for vehicle, lamp device, lens for vehicle, and method for manufacturing lens for vehicle - Google Patents
Lens for vehicle, lamp device, lens for vehicle, and method for manufacturing lens for vehicle Download PDFInfo
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- CN113310027B CN113310027B CN202010238090.3A CN202010238090A CN113310027B CN 113310027 B CN113310027 B CN 113310027B CN 202010238090 A CN202010238090 A CN 202010238090A CN 113310027 B CN113310027 B CN 113310027B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 7
- 230000003287 optical effect Effects 0.000 claims description 54
- 239000011521 glass Substances 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000003384 imaging method Methods 0.000 description 17
- 238000005286 illumination Methods 0.000 description 14
- 230000009467 reduction Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
- F21W2102/10—Arrangement or contour of the emitted light
- F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2103/00—Exterior vehicle lighting devices for signalling purposes
- F21W2103/10—Position lights
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Lenses (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
A lens for a vehicle comprises a first lens, a second lens, a third lens, a fourth lens and an aperture. The aperture is not greater than 0.8. The lens satisfies the following conditions: the lens with diopter is only 4, the diopter of the lens is positive, negative, positive and positive in sequence, the aperture is arranged between the first lens and the third lens, and the ratio of the diameter of the first lens to the diameter of the second lens is larger than 1.5. The invention also provides a lens for the vehicle, a vehicle lamp device and a manufacturing method of the lens for the vehicle.
Description
Technical Field
The present invention relates to a lens and a method for manufacturing the same, and more particularly, to a lens for an automobile headlight and a method for manufacturing the same, and a lens for an automobile, a lamp device, and a lens for a vehicle.
Background
Most of the tools commonly used for riding instead of walking are automobiles, but the most important tools are not used for providing the car lamps for driving to identify the environmental state in front of the car, and the effect of the car lamps is not only to provide environmental identification, but also to provide surrounding personnel with knowledge of the current position of the driver and achieve a considerable warning effect, however, in the warning part, the traditional car lamps only have low beam illumination and high beam illumination, so that the requirements of the driver cannot be met. In the prior art, a commercial person pushes out an automobile lamp capable of projecting a pattern, but a projection lens conventionally used in a general projection device cannot meet the requirement of traffic regulations on the illumination range of the automobile lamp. Therefore, there is a need for an optical lens design that allows for a wide illumination range, a wide viewing angle, and a large aperture, and provides lower manufacturing costs and better imaging quality.
Disclosure of Invention
Other objects and advantages of the present invention will be further understood from the technical features disclosed in the embodiments of the present invention.
An embodiment of the invention provides a lens for a vehicle, which includes a first lens, a second lens, a third lens, a fourth lens and an aperture. The aperture is not greater than 0.8. The lens satisfies the following conditions: the lens with diopter is only 4, the diopters of the lenses are positive, negative, positive and positive in sequence, the aperture is arranged between the first lens and the third lens, and the ratio of the diameter of the first lens to the diameter of the second lens is larger than 1.5. By the design of the embodiment of the invention, the lens design which can ensure that the lens has the characteristics of meeting the requirements of traffic regulations, having a wide working temperature range (40 ℃ below zero to 105 ℃), having a large aperture and having a wide viewing angle and can provide lower manufacturing cost and better imaging quality can be provided.
An embodiment of the invention provides a lens for a vehicle, which includes a first lens, a second lens, a third lens, a fourth lens and an aperture. The aperture is not greater than 0.8. The lens satisfies the following conditions: the lenses have 4 diopters, the diopters from the image amplifying side to the image shrinking side are positive, negative, positive and positive in sequence, the spatial frequency of the lens is 10lp/mm, and the Modulation Transfer Function (MTF) value at the wavelength 550nm spectrum is less than 25%. By the design of the embodiment of the invention, the lens design which can enable the lens to have the characteristics of the illumination range, the large aperture and the wide viewing angle meeting the requirements of traffic regulations and can provide lower manufacturing cost and better imaging quality can be provided.
An embodiment of the present invention provides a vehicle lamp device, including the lens, and the vehicle lamp device further includes an array light source and a vehicle lamp cover, wherein, according to the light path of the vehicle lamp device, the sequence from upstream to downstream is as follows: array light source, camera lens and car light lamp shade.
An embodiment of the present invention provides a method for manufacturing a lens for a vehicle, which includes the following sub-steps. A lens barrel is provided. The first lens, the second lens, the third lens, the fourth lens, and the aperture are placed and fixed in a lens barrel, wherein the aperture (F-number) is not more than 0.8. The lens satisfies the following conditions: the lens with diopter is only 4, the diopter of the lens is positive, negative, positive and positive in sequence, wherein the aperture is arranged between the first lens and the third lens, and the ratio of the diameter of the first lens to the diameter of the second lens is larger than 1.5.
By the design of the embodiment of the invention, the lens design which has the characteristics of the illumination range meeting the requirements of traffic regulations, the wide working temperature range (between minus 40 and 105 ℃), the large aperture and the wide visual angle and can provide lower manufacturing cost and better imaging quality can be provided. Furthermore, the projection lens of the embodiment of the invention has the characteristics of 4 optical lenses, BFL is the total length from the lens surface of the lens closest to the light source surface on the optical axis, TTL is the total length from the lens surface farthest from the light source to the light source surface on the optical axis, and BFL/TTL is less than 0.25, so that the projection lens can provide a lens design with large aperture (F/# is less than or equal to 0.8), illumination range meeting traffic regulation requirements, high resolution, miniaturization, wide working temperature range, wide viewing angle (FOV is between-20 degrees and +20 degrees), and the like, and can provide lower manufacturing cost and better imaging quality for being applied to automobile headlamps.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a schematic view of a lens 10a according to a first embodiment of the invention.
Fig. 2 to 3 are graphs showing the ratio of the illumination value of the image height position on the imaging surface of the lens 10a to the illumination value of the optical axis position on the imaging surface, and the curvature of field and the distortion map, respectively.
Fig. 4 is a schematic diagram of a lens 10b according to a second embodiment of the invention.
Fig. 5 to 6 are graphs showing the ratio of the illumination value of the image height position on the imaging surface of the lens 10b to the illumination value of the optical axis position on the imaging surface, and the curvature of field and the distortion map, respectively.
Fig. 7 is a schematic diagram of a lens 10a/10b combined with an array light source according to an embodiment of the invention.
Detailed Description
The foregoing and other features, aspects, and advantages of the present invention will become more apparent from the following detailed description of various embodiments, which proceeds with reference to the accompanying drawings. In addition, the terms "first" and "second" used in the following embodiments are used for identifying the same or similar elements, and directional terms such as "front", "rear", etc. refer only to the directions of the attached drawings, and are not intended to limit the elements.
The lens according to the present invention is a lens comprising a part or all of a transparent material and having a refractive power (power), and is typically composed of glass or plastic. May include general lenses (lens), prisms (prism), diaphragms, cylindrical lenses, biconic lenses, cylindrical array lenses, wedge plates (wedge), or combinations of the foregoing elements.
When the lens is used in a projection system, the image magnification side (image side) refers to the side on the optical path near the imaging surface (e.g., screen), and the image reduction side (object side) refers to the side on the optical path near the light source or light valve.
The object-side (or image-side) of a lens has a convex (or concave) portion in a region, meaning that the region is more "convex" in a direction parallel to the optical axis (or "concave") than the region radially immediately outside the region.
Fig. 1 is a schematic diagram of a projection lens 10a according to a first embodiment of the present invention. Referring to fig. 1, in the present embodiment, a projection lens 10a has a barrel (not shown) in which a first lens L1, a diaphragm 14, a second lens L2, a third lens L3 and a fourth lens L4 are arranged from a first side (image enlargement side OS) to a second side (image reduction side IS). Furthermore, the image reduction side IS may be provided with an array light source (LED array) 19, which emits a patterned beam of light having a pattern, and the projection lens 10a may project the patterned beam of light through a lamp housing (not shown) to an imaging plane (not shown). In another embodiment, an array of light sources (LED array) may be substituted for the combination of light sources and light valves. In the present embodiment, the refractive powers of the first lens element L1 to the fourth lens element L4 on the optical axis 12 are positive, negative, positive and positive in order. All lenses are glass spherical lenses. In one embodiment, the glass lens may be replaced with a plastic lens. In addition, two adjacent surfaces of the two lenses have substantially the same (the difference of curvature radius is less than 0.005 mm) or completely the same (the same) curvature radius and form a combined lens, a cemented lens, a doublet (doublet) or a triplet (triplet), for example, the second lens L2 and the third lens L3 of the present embodiment may form a cemented lens, but the embodiment is not limited thereto. The image enlargement side OS of each embodiment of the present invention IS disposed on the left side of each drawing, and the image reduction side IS disposed on the right side of each drawing, respectively, and will not be repeated.
The Aperture 14 is an Aperture Stop (Aperture Stop), and is a separate component or integrated with other optical components. In this embodiment, the aperture is similar to the aperture by blocking the peripheral light and leaving the middle portion transparent, and the mechanism may be adjustable. By adjustable, it is meant that the position, shape or transparency of the machine element is adjusted. Alternatively, the aperture may be coated with an opaque light absorbing material on the surface of the lens, and the light absorbing material may be made to pass through the central portion of the aperture to limit the light path.
Each lens defines a lens diameter. For example, as shown in fig. 1, the lens diameter refers to the distance between the mirror turning points P, Q at both ends of the optical axis 12 in the direction perpendicular to the optical axis 12 (e.g., the lens diameter D). In the present embodiment, the diameter (D1) of the first lens L1 is 49.04mm, the Diameter (DL) of the fourth lens L4 is 24.6mm, and the ratio of the diameter of the first lens L1 to the diameter of the second lens L2 or the diameter of the fourth lens L4 is greater than 1.5. In this embodiment, the lens 10a has a diopter lens, and at least one lens has a diameter between 40mm and 60mm.
Spherical lens means that the surfaces of the front and rear of the lens are each part of a spherical surface, and the curvature of the spherical surface is fixed. The lens design parameters and the outer shape of the projection lens 10a are shown in table one. However, the following description is not intended to limit the invention, and it is within the scope of the invention for one of ordinary skill in the art to make appropriate changes to the parameters or settings after referencing the invention.
List one
The pitch of S1 is the distance between the surfaces S1 to S2 on the optical axis 12, the pitch of S2 is the distance between the surfaces S2 to S3 on the optical axis 12, and the pitch of S8 is the distance between the surface S8 and the array light source 19 on the optical axis 12.
The presence of a surface in a surface means that the surface is an aspheric or freeform surface, and if not labeled, is spherical.
The radius of curvature refers to the inverse of the curvature. The radius of curvature IS positive, and the center of sphere of the lens surface IS in the direction of the image reduction side IS of the lens. When the radius of curvature is negative, the center of the lens surface is in the direction of the image magnification side OS of the lens. While the convex-concave of each lens is visible in the table above.
The aperture value of the present invention is represented by F/# as indicated in the above table. When the lens is applied to a projection system, an imaging surface is positioned on an image amplifying side OS. In embodiments of the present invention, F/# is less than or equal to 0.8.
In this embodiment, the image height IM refers to the length of the diagonal line (image circle) of the surface light emitting area of the array light source (LED array) 19, as indicated in the above table.
In the present embodiment, the total length of the lens 10a is denoted by OAL, as indicated in the above table. More specifically, the total length of the present embodiment refers to the distance measured along the optical axis 12 between the optical surface S1 closest to the image magnification side OS and the optical surface S8 closest to the image reduction side IS of the lens 10 a. The total lens length (OAL) of the lens 10a is less than 70mm. In the present embodiment, the total length from the optical surface S1 of the lens 10a closest to the image-magnifying side OS to the surface of the array light source 19 is represented by TTL, as indicated in the above table. More specifically, the total length of the lens 10a to the surface of the array light source 19 in this embodiment is the distance between the optical surface S1 of the lens 10a closest to the image magnification side OS and the surface of the array light source 19, measured along the optical axis 12. The Total Length (TTL) of the lens 10a to the surface of the array light source 19 is less than 75mm. In this embodiment, IM is the Image height (Image circle) of the diagonal line of the light emitting area of the surface of the array light source. In the present embodiment, the total length of the lens 10a from the closest image reduction side IS to the surface of the array light source 19 IS represented by BFL, and more specifically, the total length of the lens 10a from the closest image reduction side IS to the surface of the array light source 19 in the present embodiment refers to the distance measured along the optical axis 12 between the optical surface S8 of the lens 10a closest to the image reduction side IS and the surface of the array light source 19. The total length (BFL) of the lens 10a to the surface of the array light source 19 is less than 15mm, and the BFL/TTL of this embodiment is between 0.065 and 0.25. The lens design of the embodiment of the invention can meet the following conditions: the diameter (D1) of the first lens L1 of the lens divided by OAL has a value between 0.6 and 0.8, and the diameter (D1) of the first lens L1 of the lens divided by IM has a value greater than 3.
In the present embodiment, the full field angle FOV refers to the angle of the light receiving of the optical surface S1 closest to the image magnification end, i.e. the field of view measured in horizontal and vertical lines, as indicated in the above table. In this embodiment, the FOV is between-11 degrees and +11 degrees. In another embodiment, the FOV is between-12 degrees and +12 degrees. In this embodiment, when the FOV is 10 degrees, the relative illuminance value is 50 or more. In this embodiment, the lens 10a is a fixed focus lens.
In the embodiment of the present invention, the lens can emit the array light source 19 with an aspect ratio between 2.2:1 to 4:1, the light beam is projected to the horizontal ground, and the distance from the lamp shade of the car lamp to the ground projection light beam is between 5 meters and 25 meters. In the embodiment of the invention, the spatial frequency of the lens is below 10lp/mm, and the Modulation Transfer Function (MTF) value under the spectrum with the wavelength of 550nm is less than 25%. In another embodiment, the spatial frequency of the lens is below 10lp/mm and the Modulation Transfer Function (MTF) value at a wavelength of 550nm spectrum is less than 20%.
The aperture value of the lens according to an embodiment of the invention is less than or equal to about 0.8. The projection lens comprises a cemented lens for correcting chromatic aberration, and the minimum distance between the two lenses of the cemented lens along the optical axis is less than or equal to 0.01mm. A two-piece cemented lens (doubelet lens) may be substituted for, for example, a triplet lens (triplet lens) without limitation. The doublet, cemented lens, combined lens, and triplet each comprise corresponding adjacent surfaces having substantially the same or similar radii of curvature. The total number of lenses with diopters is 4. The projection lens is suitable for the working temperature range of at least-40 to 105 ℃.
A design of a second embodiment of the projection lens of the present invention will be described below. The same portions of the present embodiment as those of the first embodiment will not be described again, and only major differences will be described. The diameter (D1) of the first lens L1 is 48.72mm, the Diameter (DL) of the fourth lens L4 is 24.6mm, and the ratio of the diameter of the first lens L1 to the diameter of the second lens L2 or the fourth lens L4 is greater than 1.5. The design parameters and the appearance of the projection lens of the second embodiment are shown in the table two respectively.
Watch II
The distance S1 is the distance between the surfaces S1 to S2 on the optical axis 12, the distance S2 is the distance between the surfaces S2 to S3 on the optical axis 12, and the distance S8 is the distance between the surface S8 and the LED array 19 on the optical axis 12.
A design of a third embodiment of the projection lens of the present invention will be described below. The same portions of the present embodiment as those of the first embodiment will not be described again, and only major differences will be described. The diameter (D1) of the first lens L1 is 48.65mm, the Diameter (DL) of the fourth lens L4 is 25mm, and the ratio of the diameter of the first lens L1 to the diameter of the second lens L2 or the fourth lens L4 is greater than 1.5. The design parameters and the appearance of the projection lens of the third embodiment are shown in the table three respectively.
Watch III
Fig. 4 is a schematic diagram of a projection lens 10b according to a fourth embodiment of the present invention. Referring to fig. 4, in the present embodiment, the projection lens 10b has a barrel (not shown) in which a first lens L1, a second lens L2, a diaphragm 14, a third lens L3 and a fourth lens L4 are arranged from a first side (image enlargement side OS) to a second side (image reduction side IS). Furthermore, the image reduction side IS may be provided with an array light source 19, which emits a patterned beam of light having a pattern, and the projection lens 10b may project the patterned beam of light through a lamp housing (not shown) to an imaging plane (not shown). In another embodiment, an array of light sources (LED array) may be substituted for the combination of light sources and light valves. In the present embodiment, the refractive powers of the first lens element L1 to the fourth lens element L4 on the optical axis 12 are positive, negative, positive and positive in order. All lenses are glass spherical lenses. In the present embodiment, the diameter (D1) of the first lens L1 is 49mm, the Diameter (DL) of the fourth lens L4 is 22mm, and the ratio of the diameter of the first lens L1 to the diameter of the second lens L2 or the diameter of the fourth lens L4 is greater than 1.5. In this embodiment, the lens 10b has a diopter lens, and at least one lens has a diameter between 40mm and 60mm. The lens design parameters and the outer shape of the projection lens 10b are shown in table four.
Table four
The distance S1 is the distance between the surfaces S1 to S2 on the optical axis 12, the distance S2 is the distance between the surfaces S2 to S3 on the optical axis 12, and the distance S9 is the distance between the surface S9 and the LED array 19 on the optical axis 12.
A design of a fifth embodiment of the projection lens of the present invention will be described below. The same portions of the present embodiment as those of the fourth embodiment will not be described again, and only major differences will be described. The diameter (D1) of the lens L1 is 48mm, the Diameter (DL) of the fourth lens L4 is 22mm, and the ratio of the diameter of the first lens L1 to the diameter of the second lens L2 or the fourth lens L4 is more than 1.5. The design parameters and the appearance of the projection lens of the fifth embodiment are shown in table five.
TABLE five
The distance S1 is the distance between the surfaces S1 to S2 on the optical axis 12, the distance S2 is the distance between the surfaces S2 to S3 on the optical axis 12, and the distance S9 is the distance between the surface S9 and the LED array 19 on the optical axis 12.
A design of a sixth embodiment of the projection lens of the present invention will be described below. The same portions of the present embodiment as those of the fourth embodiment will not be described again, and only major differences will be described. The diameter (D1) of the first lens L1 is 48mm, the Diameter (DL) of the fourth lens L4 is 22.4mm, and the ratio of the diameter of the first lens L1 to the diameter of the second lens L2 or the fourth lens L4 is greater than 1.5. The design parameters and the appearance of the projection lens of the sixth embodiment are shown in table six.
TABLE six
Fig. 2 to 3 and fig. 5 to 6 are respectively a ratio chart of an illumination value of an image height position on an imaging surface (screen) of the lenses 10a and 10b to an illumination value of an optical axis position on the imaging surface, and a curvature of field and a distortion chart according to an embodiment of the present invention. The graphs shown in the pseudo-data diagrams of fig. 2 to 3 and fig. 5 to 6 are all within the standard range, so that it can be verified that the lenses 10a and 10b of the present embodiment can actually have the characteristics of good optical imaging quality. The relative illuminance value of the lens 10a of the present embodiment is greater than 50 when the FOV is 10 degrees. The relative illuminance value of the lens 10b of the present embodiment is greater than 50 when the FOV is 20 degrees.
In this embodiment, the total length of the lens 10b is denoted by OAL, as indicated in the above table. More specifically, the total length of the present embodiment IS the distance between the optical surface S1 of the lens 10b closest to the image enlarging side OS and the optical surface S9 closest to the image reducing side IS measured along the optical axis 12. The total lens length (OAL) of the lens 10b is less than 55mm. In the present embodiment, the total length from the optical surface S1 of the lens 10b closest to the image-magnifying side OS to the surface of the array light source 19 is represented by TTL, as indicated in the above table. More specifically, the total length of the lens 10b to the surface of the array light source 19 in this embodiment is the distance between the optical surface S1 of the lens 10b closest to the image magnification side OS and the surface of the array light source 19, measured along the optical axis 12. The Total Length (TTL) of the lens 10b to the surface of the array light source 19 is less than 60mm. In this embodiment, IM is the Image height (Image circle) of the diagonal line of the light emitting area of the surface of the array light source. In the present embodiment, the total length of the lens 10b from the closest image reduction side IS to the surface of the array light source 19 IS represented by BFL, and more specifically, the total length of the lens 10b from the closest image reduction side IS to the surface of the array light source 19 in the present embodiment refers to the distance measured along the optical axis 12 between the optical surface S9 of the lens 10b closest to the closest image reduction side IS and the surface of the array light source 19. The total length (BFL) of the lens 10b to the surface of the array light source 19 is less than 10mm, and the BFL/TTL of this embodiment is between 0.05 and 0.2. The lens design of the embodiment of the invention can meet the following conditions: the diameter (D1) of the first lens L1 of the lens divided by OAL has a value between 0.85 and 0.95, and the diameter (D1) of the first lens L1 of the lens divided by IM has a value less than 4.
In the present embodiment, the full field angle FOV refers to the angle of the light receiving of the optical surface S1 closest to the image magnification end, i.e. the field of view measured in horizontal and vertical lines, as indicated in the above table. In this embodiment, the FOV is between-21 degrees and +21 degrees. In another embodiment, the FOV is between-22 degrees and +22 degrees. In this embodiment, when the FOV is 20 degrees, the relative illuminance value is 50 or more. In this embodiment, the lens 10b is a fixed focus lens.
As shown in fig. 7, an array light source (LED array) 110 includes a substrate 111 and a plurality of light emitting elements 112. The light emitting element 112 is disposed on the substrate 111. Since the light emitting element 112 of the array light source 110 can emit a patterned light beam L1', the light path between the array light source 110 and the lens 10a/10b is not configured with any light valve, but the embodiment of the invention is not limited thereto. In addition, the light path between the array light source 110 and the lens 10a/10b may not be configured with a conventional light combining module or light combining element. The lenses 10a/10b can emit the array light source (LED array) 110 (19) with an aspect ratio between 2.2:1 to 4:1, the light beam is projected to the horizontal ground, and the distance from the lamp shade of the car lamp to the ground projection light beam is between 5 meters and 25 meters.
The light emitting elements 112 are, for example, self-luminous light emitting elements. In this case, the array type light source 110 does not need a backlight module. In an embodiment, the light emitting device 112 is, for example, a Micro light emitting diode (Micro LED), and the Micro LED can be disposed on the substrate 111 by a suitable technique such as mass transfer, and then packaged into a single Micro LED chip, which has a size smaller than 100 micrometers, and can achieve individual addressing of each pixel (pixel) as an Organic Light Emitting Diode (OLED), and individually drive light emission (self-luminescence), but is more power-saving and has a faster reaction speed than the OLED. In another embodiment, the light emitting element 112 is, for example, a sub-millimeter light emitting diode (Mini LED) that is between about 100 microns and about 200 microns. However, according to the classification of the wafer optoelectronics, inc., the typical LED die is between about 200 microns and about 300 microns, the Mini LED is between about 50 microns and about 60 microns, and the Micro LED is about 15 microns, so the size is not suitable for unique classification, only auxiliary classification, or whether it can be distinguished from the self-luminous and LED production technology.
In one embodiment, the light emitting elements 112 can be controlled to emit light independently, so that some of the light emitting elements 112 emit light, while others do not emit light, so that the light beam L1' presents a pattern. In other words, the array light source 110 can emit the light beam L1 '(image light) having the first aspect ratio of the pattern, and the pattern of the light beam L1' can be changed by controlling the plurality of light emitting elements 112. In other embodiments, the light emitting elements 112 can emit light of different colors (different color temperatures) at the same time, and each light emitting element 112 can emit light of a plurality of different colors, such as red light, blue light, green light, and white light. Alternatively, all of the light emitting elements 112 may emit light of a single color having different gray levels, such as white light or light of any color temperature.
In addition, the light emitting elements 112 are arranged in an n×m matrix, where n and m are positive integers equal to or greater than 1, the sum of n and m is greater than 2, and the values of n and m may be equal or different. In one embodiment, the values of n and m may be between about 1 and about 1000000, such as several, tens, hundreds, thousands, tens of thousands or hundreds of thousands, or even more. In this way, the resolution of the pattern of the light beam L1 'may be increased and/or the light beam L1' may be provided with more pattern variations.
By the design of the embodiment of the invention, the lens design which can ensure that the lens has the characteristics of meeting the requirements of traffic regulations, having a wide working temperature range (40 ℃ below zero to 105 ℃), having a large aperture and having a wide viewing angle and can provide lower manufacturing cost and better imaging quality can be provided. Furthermore, the projection lens of the embodiment of the invention has the characteristics of 4 optical lenses, BFL is the total length from the lens surface of the lens closest to the light source surface on the optical axis, TTL is the total length from the lens surface farthest from the light source to the light source surface on the optical axis, and BFL/TTL is less than 0.25, so that the projection lens can provide a lens design with large aperture (F/# is less than or equal to 0.8), illumination range meeting traffic regulation requirements, high resolution, miniaturization, wide working temperature range, wide viewing angle (FOV is between-20 degrees and +20 degrees), and the like, and can provide lower manufacturing cost and better imaging quality for being applied to automobile headlamps.
While the invention has been described with respect to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and that any such changes and modifications as described in the above embodiments are intended to be within the scope of the invention.
Claims (10)
1. A projection lens for a front vehicle lamp, comprising:
a first lens, a second lens, a third lens and a fourth lens; and
an aperture not greater than 0.8;
wherein, the projection lens of front car light satisfies the following condition: the lens with diopter of the projection lens of the front car lamp is only 4, the diopter of the lens is positive, negative, positive and positive in sequence, the aperture is arranged between the first lens and the third lens, and the ratio of the diameter of the first lens to the diameter of the second lens is larger than 1.5.
2. A projection lens for a front vehicle lamp, comprising:
the optical power of the first lens, the second lens, the third lens and the fourth lens from the image amplifying side to the image shrinking side is positive, negative, positive and positive in sequence; and
the aperture of the projection lens of the front car lamp is not more than 0.8;
wherein, the projection lens of front car light satisfies the following condition: the projection lens of the front car lamp has 4 lenses with diopter, the space frequency of the projection lens of the front car lamp is below 10lp/mm, and the modulation conversion function value under the spectrum with the wavelength of 550nm is less than 25%.
3. A headlamp assembly comprising the projection lens of a headlamp according to claim 1 or 2, further comprising an array light source and a headlamp housing, wherein, according to the optical path of the headlamp assembly, the sequential arrangement from upstream to downstream is: the array light source, the projection lens of the front car lamp and the car lamp shade.
4. A headlamp assembly according to claim 3, wherein the projection lens of the headlamp projects a portion of the light beam emitted by the array light source onto a level ground surface and the distance of the light beam from the lamp housing to the ground surface is between 5 meters and 25 meters.
5. The projection lens of a front headlight according to claim 1 or 2, wherein the projection lens of the front headlight satisfies one of the following conditions: (1) The diopter lens has at least one lens diameter of 40 mm-60 mm, and (2) the angle of view is-20 degrees to +20 degrees.
6. The projection lens of a headlamp according to claim 1 or 2, wherein the diopter lens satisfies one of the following conditions: (1) The lens shapes are crescent, biconcave, biconvex and crescent in sequence, and (2) the lens shapes are plano-convex, biconcave, biconvex and biconvex in sequence.
7. The projection lens of a front headlight according to claim 1 or 2, wherein the projection lens of the front headlight satisfies one of the following conditions: the lens with diopter is (1) a glass lens, (2) a spherical lens, (3) a cemented lens, and (4) a single lens.
8. A headlamp assembly according to claim 3, wherein the projection lens of the headlamp satisfies one of the following conditions: (1) TTL is the total length on the optical axis of the lens surface closest to the array light source surface, the TTL is less than 75mm, (2) BFL is the total length on the optical axis of the lens surface closest to the array light source surface, 0.05< BFL/TTL <0.25.
9. The projection lens of a front headlight according to claim 1 or 2, wherein the projection lens of the front headlight satisfies one of the following conditions: (1) D1 is the diameter of the first lens, OAL is the total length on the optical axis from the lens surface closest to the array light source to the surface furthest from the array light source, 0.6< D1/OAL <0.95, (2) D1 is the diameter of the first lens, IM is the diagonal length of the array light source, D1/IM <4, (3) D1 is the diameter of the first lens, IM is the diagonal length of the array light source, D1/IM >3.
10. A method for manufacturing a projection lens for a headlight, comprising:
providing a lens cone; and
a first lens, a second lens, a third lens, a fourth lens and an aperture are arranged in the lens cone and fixed, wherein the aperture is not more than 0.8, and the projection lens of the front car lamp meets the following conditions: the lens with diopter of the projection lens of the front car lamp is only 4, and the diopters of the lenses are positive, negative, positive and positive in sequence, wherein the aperture is arranged between the first lens and the third lens, and the ratio of the diameter of the first lens to the diameter of the second lens is larger than 1.5.
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| TW109106553 | 2020-02-27 | ||
| TW109106553A TWI717218B (en) | 2020-02-27 | 2020-02-27 | Lens and fabrication method thereof and vehicle lamp |
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| CN113310027A CN113310027A (en) | 2021-08-27 |
| CN113310027B true CN113310027B (en) | 2024-01-23 |
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| TWI794757B (en) * | 2021-03-02 | 2023-03-01 | 揚明光學股份有限公司 | Headlight and projection device for vehicles |
| US11428378B1 (en) | 2021-04-12 | 2022-08-30 | Young Optics Inc. | Vehicle lamp device and projection lens for vehicle lamp |
| TWI782827B (en) * | 2021-12-17 | 2022-11-01 | 揚明光學股份有限公司 | Projection lens for vehicle and projector for vehicle |
| TWI811987B (en) * | 2022-01-28 | 2023-08-11 | 揚明光學股份有限公司 | Optical lens |
| CN115046170B (en) * | 2022-07-06 | 2024-03-15 | 中国第一汽车股份有限公司 | ADB module and vehicle |
| JP7531255B1 (en) | 2023-04-13 | 2024-08-09 | ナルックス株式会社 | A bright, wide-angle projection optical system for vehicles using cemented lenses |
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| TWI717218B (en) | 2021-01-21 |
| TW202132849A (en) | 2021-09-01 |
| CN113310027A (en) | 2021-08-27 |
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