CN210142208U

CN210142208U - Lens and lens

Info

Publication number: CN210142208U
Application number: CN201920655684.7U
Authority: CN
Inventors: 余荣军; 蒯泽文; 高健
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-03-13
Anticipated expiration: 2029-05-09

Abstract

The utility model relates to a lens and camera lens, wherein the lens includes lens substrate (1) and plates the system and be in at least one rete structure (2) on the surface of lens substrate (1), rete structure (2) include in first IR membrane system (21), second IR membrane system (22) and third AR membrane system (23) stack of two kinds at least. The utility model discloses a lens has fine infrared light cut-off performance, will the utility model discloses a lens can cancel infrared cut-off filter's installation in assembling the camera lens to can reduce the size of camera lens.

Description

Lens and lens

Technical Field

The utility model relates to an optical imaging technical field especially relates to a lens and contain camera lens of this lens.

Background

In the imaging lens, due to a photoelectric effect, semiconductors such as a CCD or CMOS image sensor can not only sense visible light, but also sense light in an infrared band (wavelength is larger than 760nm), so that the band of the sensed light is extended. The black part of the original picture is therefore reddish, resulting in color cast. Therefore, an infrared cut-off filter is usually arranged in front of the CCD or CMOS of the camera sensor, so that infrared rays can be effectively filtered, and visible light rays can pass through, thereby generating the influence of normal color.

In the prior art, various infrared cut-off filters exist, the infrared cut-off filter taking blue glass as a substrate material belongs to an absorption filter, and compared with a common interference infrared cut-off filter, the blue glass can effectively reduce the problems of chromatic aberration of transmitted light, scattered light ghost and the like. But it is relatively costly and relatively resource limited.

Meanwhile, as personal electronic products are becoming thinner, each component inside the electronic products is required to have a smaller size. In particular, the size of an optical system for photography is required to be reduced in size in the market trend, and it is one of the research directions to reduce the thickness of a filter and to eliminate the use of the filter while ensuring the optical performance of a lens.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lens and camera lens reduce the camera lens size.

In order to achieve the above object, the present invention provides a lens, comprising a lens substrate and a film structure coated on at least one surface of the lens substrate, wherein the film structure comprises a stack of at least two of a first IR film system, a second IR film system and a third AR film system.

According to an aspect of the utility model, the rete structure has a passband wave band, two transition wave bands and two cut-off wave bands within the range of 350nm-1200nm, the passband wave band is located two between the cut-off wave band, the transition wave band is located the passband wave band with between the cut-off wave band.

According to one aspect of the present invention, the first IR film system has a transmittance of more than 99% in the 400nm-670nm band range and stops in the 750nm-920nm band range;

the second IR film has a transmittance of more than 99% in the 400-650 nm band and a cut-off in the two bands of 350-400 nm and 900-1200 nm.

According to an aspect of the present invention, the lens substrate is a resin lens or a glass-plastic hybrid lens.

According to one aspect of the invention, the lens substrate is made of a plastic material and contains at least one long wave absorbing component.

According to one aspect of the present invention, the lens substrate containing the long-wave absorbing component has an average transmittance of 50% or more in a wavelength range of 350nm to 650nm and an average transmittance of 30% or less in a wavelength range of 700nm to 1100 nm.

According to an aspect of the present invention, the first IR film system, the second IR film system and the third AR film system have the structure: (HL) N or (LH) N;

wherein H denotes a high refractive index material layer, L denotes a low refractive index material layer, and (HL) × N denotes N times of alternate plating of the high refractive index material layer and the low refractive index material layer.

According to an aspect of the present invention, the high refractive index material layer is selected from at least one of silicon hydride, silicon germanium hydride, SiC, Nb2O5, and an oxide of Ti;

the low refractive index material layer is selected from at least one of oxide, nitride or oxynitride of Al, Ti, Si, Sn, Hf, Ta and Y.

According to an aspect of the present invention, the passband wavelength of the film structure is 400nm-680nm, the average transmittance is greater than or equal to 95%, the two cut-off wavelength bands are 350nm-380nm and 730nm-1100nm, respectively, the average transmittance is less than 1%, the two transition wavelength bands are 380 ion-400 nm and 680nm-730nm, respectively, and the average transmittance is 1% -95%.

According to one aspect of the present invention, the passband wavelength of the film structure is 400nm to 680nm, and the average transmittance is greater than or equal to 95%;

the two cut-off wave bands are respectively 350nm-380nm and 730nm-1100nm, and the average transmittance is less than 1%;

the two transition wave bands are respectively 380-400nm and 680-730 nm, and the average transmittance is 1-95%.

According to an aspect of the present invention, in a range where an incident angle is changed from 0 ° to 30 °, a drift width of a wavelength corresponding to a position where a light transmittance T of the film layer structure is 50% is less than 25 nm.

According to an aspect of the invention, the steepness of the membrane layer structure passband band UV side and IR side is less than 30 nm.

The utility model also provides a camera lens that contains above-mentioned lens, the camera lens includes: the lens system comprises a lens barrel and a lens group arranged in the lens barrel, wherein the lens group at least comprises one lens;

and the distance FFL from the lens closest to the image surface in the lens group to the image surface is less than or equal to 0.7 mm.

According to one aspect of the present invention, the film structure is selected from the group consisting of a stack of at least two of the first IR film system, the second IR film system and the third AR film system. The first IR film system and the second IR film system are used for cutting off infrared rays and highly transmitting visible light, and the third AR film system is an antireflection film and is used for improving the transmittance of the first IR film system and/or the second IR film system in the visible light wave band range. Can effectively realize the utility model discloses a lens is to the high permeability of ending and visible light wave band of infrared light wave band.

According to one aspect of the present invention, the first IR film system has a transmittance greater than 99% in the range of 460-670nm band and stops in the range of 750-920 nm band. The second IR film has a transmittance of more than 99% in the 400nm-650nm band and cut-off in the two bands of 350nm-400nm and 900nm-1200 nm. The first IR film system and the second IR film system are overlapped to form the film layer structure of the utility model, which can ensure the high permeability of the visible light wave band and the cut-off of the infrared light wave band within the range of 350nm-1200 nm. The passband wavelength band of the film layer structure is 400nm-680nm, and the average transmittance is more than or equal to 95%. The two cut-off wave bands are respectively 350nm-380nm and 730nm-1100nm, and the average transmittance is less than 1%. The two transition wave bands are respectively 380nm-400nm and 680nm-730nm, and the average transmittance is 1% -95%.

According to the utility model discloses a scheme adopts resin lens or glass to mould mixed lens as the lens substrate, plates system membranous layer structure on the lens substrate. Compare and use blue glass as the lens substrate among the prior art, the utility model discloses a lens is drawn materials and is selected relatively extensively, can reduce in production cost by a wide margin. And the processing technology has small difficulty, and the film structure is more stably matched and is easy to fall off.

According to one embodiment of the present invention, the lens substrate is made of a plastic material and includes at least one long-wave absorbing component, and then the lens substrate is coated with a film structure. Thereby make lens substrate and rete structure all have certain infrared cut-off performance and visible light transmission ability, combine both can further promote the utility model discloses the lens is to the high permeability of visible light wave band and the ending of infrared light wave band.

According to the utility model discloses a scheme, membranous layer structure passband wave band has central wavelength, changes to 30 within ranges at the angle of incidence from 0, and membranous layer structure light transmittance T is less than 25nm for the drift range of 50% department's corresponding wavelength. Therefore, on the premise of ensuring high visible light transmittance, the drift of the center wavelength of the passband of the film structure along with the angle can be reduced, and the imaging quality is favorably improved. And the steepness of curves of the UV side (the side close to the short wavelength) and the IR side (the side close to the long wavelength) of the passband wave band is less than 30nm, so that the optical performance of the lens can be further improved, and the lens can be assembled into a lens to further improve the imaging quality of the lens.

According to the utility model discloses a scheme the utility model discloses an in the camera lens, be provided with the utility model discloses a lens can be well cut off infrared light wave band, and is high to the visible light wave band to need not set up infrared cut-off filter and corresponding fixed knot again in the equipment of camera lens, consequently can reduce the length and size of camera lens, can be particularly with the lens that is closest to image planes in the battery of lens apart from the distance control of image planes within 0.7 mm.

Drawings

Fig. 1 schematically shows a block diagram of a lens according to an embodiment of the invention;

fig. 2 schematically shows a wavelength transmittance profile of a lens according to an embodiment of the present invention;

FIG. 3 is a graph schematically showing the wavelength transmittance of a first IR film system according to an embodiment of the present invention;

FIG. 4 is a graph schematically showing the wavelength transmittance of a second IR film system according to an embodiment of the present invention;

FIG. 5 is a graph schematically illustrating the wavelength transmittance of a lens substrate of the present invention comprising a long wave absorbing component;

fig. 6 is a graph schematically illustrating the drift amount of the film structure according to the present invention when the incident angle is changed from 0 ° to 30 °;

fig. 7 schematically shows a diagram of the steepness of the UV side and the IR side of the film structure according to the invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

The lens of the utility model comprises a lens substrate 1 and a film layer structure 2 coated on at least one surface of the lens substrate 1. As shown in fig. 1, in the present embodiment, a film structure 2 is plated on the upper surface of a lens substrate 1. Of course, the film structure 2 may be plated on the lower surface of the lens substrate 1, and the film structure 2 may be plated on both surfaces of the lens substrate 1.

In the present invention, the film structure 2 includes a stack of at least two of the first IR film system 21, the second IR film system 22 and the third AR film system 23. The first IR film series 21 and the second IR film series 22 are used for cutting off infrared rays and highly transmitting visible light, and the third AR23 film series is an antireflection film for improving the transmittance of the first IR film series 21 and/or the second IR film series 22 in the visible light band range. In the present invention, the film structure 2 may be a stacked structure of a first IR film system 21 and a second IR film system 22, a stacked structure of a first IR film system 21 and a third AR film system 23, a stacked structure of a second IR film system 22 and a third AR film system, or a stacked structure of a first IR film system, a second IR film system and a third AR film system. The order of plating of the individual film systems in the direction away from the lens substrate 1 is not required. In the case where the film layer structure 2 is formed by stacking the first IR film system 21 and the second IR film system 22, the first IR film system 21 may be plated first and then the second IR film system 22 may be plated first, and then the first IR film system may be plated second, along the direction away from the lens substrate 1.

The lens of the present invention, the film structure 2 selects the superposition of at least two of the first IR film system 21, the second IR film system 22 and the third AR film system 23. The first IR film series 21 and the second IR film series 22 are used for cutting off infrared rays and highly transmitting visible light, and the third AR23 film series is an antireflection film for improving the transmittance of the first IR film series 21 and/or the second IR film series 22 in the visible light band range. Can effectively realize the utility model discloses a lens is to the high permeability of ending and visible light wave band of infrared light wave band.

As shown in fig. 2, in the present invention, the film structure 2 has a passband, two transition bands and two cutoff bands within the 350nm-120nm band range. The passband band is located between the two cutoff bands and the transition band is located between the passband band and the cutoff bands.

Referring to fig. 3 and 4, according to an embodiment of the present invention, the film structure 2 includes a first IR film system 21 and a second IR film system 22 stacked together. Wherein the first IR film system 21 has a transmittance of more than 99% in the wavelength range of 460-670nm and a cut-off in the wavelength range of 750-920 nm. The second IR film system 22 has a transmittance of more than 99% in the 400nm-650nm band and a cut-off in the two bands of 350nm-400nm and 900nm-1200 nm.

Thus, the first IR film system 21 and the second IR film system 22 are stacked to form the film structure 2 of the present invention, which can ensure high transmittance of visible light band and cut-off of infrared light band within the range of 350nm-1200 nm. Specifically, as shown in fig. 2, the passband of the film layer structure 2 is 400nm to 680nm, and the average transmittance is greater than or equal to 95%. The two cut-off wave bands are respectively 350nm-380nm and 730nm-1100nm, and the average transmittance is less than 1%. The two transition wave bands are respectively 380nm-400nm and 680nm-730nm, and the average transmittance is 1% -95%.

In the present invention, the first IR film system 21, the second IR film system 22, and the third AR film system have a structure of (HL) × N or (LH) × N. Wherein H denotes a high refractive index material layer, L denotes a low refractive index material layer, and (HL) × N denotes N times of alternate plating of the high refractive index material layer and the low refractive index material layer. That is, the first IR film system 21, the second IR film system 22 and the third AR film system 23 are formed by alternately plating a high refractive index material layer and a low refractive index material layer, and the number of times of alternately plating the high refractive index material layer and the low refractive index material layer may be the same or different. Because the high-refractive-index material layers and the low-refractive-index materials are alternately plated, a passband waveband, a transition waveband and a cutoff waveband can be generated through the interference effect of incident light. The utility model discloses in, the value of N is positive integer, preferably, N more than or equal to 3.

In the present invention, the high refractive index material layer is selected from one or more of silicon hydride, silicon germanium hydride, SiC, Nb2O5, and Ti oxide. The low refractive index material layer is selected from one or more of oxides, nitrides or oxynitrides of Al, Ti, Si, Sn, Hf, Ta and Y.

According to an embodiment of the present invention, the film layer structure 2 is coated on the lens substrate 1, and the lens substrate 1 is a resin lens or a glass-plastic hybrid lens, such as one or more combinations of a cycloolefin copolymer material, a cycloolefin and ethylene copolymer material, an epoxy resin material, a polyolefin material, or a polymethacrylic acid material.

In the lens of the utility model, a resin lens or a glass-plastic mixed lens is adopted as a lens substrate 1, and a film layer structure 2 is plated on the lens substrate 1. Compare and use blue glass as lens substrate 1 among the prior art, the utility model discloses a lens is drawn materials and is selected relatively extensively, can reduce in production cost by a wide margin. And the processing technology has small difficulty, and the film layer structure 2 is more stably matched and is easy to fall off.

According to another embodiment of the present invention, the lens substrate 1 is made of a plastic material and contains at least one long wave absorbing component. That is, in the present embodiment, the lens substrate 1 itself has long-wave absorbing properties. And then a film layer structure 2 is plated on the lens substrate 1 with long wave absorption performance. Specifically, the long-wavelength absorbing component is a substance that can absorb long-wavelength light and helps to maintain the transparency of the lens, and in the present embodiment, the long-wavelength absorbing component may be selected from one or more of ABS 642, ABS 643, ABS 647, ABS 654, ABS 659, IRA 705, IRA 732, IRA 735, and IRA 764.

As shown in FIG. 5, in the present invention, the lens substrate 1 having a long-wave absorbing component has an average transmittance of 50% or more in a wavelength range of 350nm to 650nm and an average transmittance of 30% or less in a wavelength range of 700nm to 1100 nm. Preferably, at least one of the object-side and image-side surfaces of the lens with the long-wavelength absorption component is aspheric, so that the surface type of the optical lens can be designed according to the miniaturization design requirement and the visual requirement of the lens, and the generation of aberration is effectively reduced to improve the imaging quality.

The lens of the utility model adopts plastic material to make the lens substrate 1, and at least comprises a long wave absorbing component, and then the film layer structure 2 is coated on the lens substrate 1. Thereby make lens substrate 1 and rete structure 2 all have certain infrared cut-off performance and visible light transmission performance, combine both to further promote the utility model discloses the lens is to the high permeability of visible light wave band and the ending of infrared light wave band.

As shown in fig. 6, in the present invention, in the range of the incident angle from 0 ° to 30 °, the drift width of the wavelength corresponding to the position where the light transmittance T of the film layer structure 2 is 50% is smaller than 25 nm. Therefore, on the premise of ensuring high visible light transmittance, the drift of the center wavelength of the passband of the film structure 2 along with the angle can be reduced, and the imaging quality is favorably improved.

As shown in fig. 7, in the present invention, the steepness of the curve of the pass band UV side (near the short wavelength side) and IR side (near the long wavelength side) is less than 30nm, so that the optical performance of the lens can be further improved, and the imaging quality of the lens can be further improved when the lens is assembled into a lens.

The utility model also provides a camera lens that contains above-mentioned lens. The camera lens includes the lens cone and sets up the battery of lens in the lens cone, contains a slice at least in the battery of lens the utility model discloses a lens. The distance FFL from the lens closest to the image surface in the lens group to the image surface is less than or equal to 0.7 mm.

The utility model discloses an in the camera lens, be provided with the utility model discloses a lens can end to the infrared light wave band well, and is high to the visible light wave band to need not set up infrared cut-off filter and corresponding fixed knot structure again in the equipment of camera lens, consequently can reduce the length and size of camera lens, can be particularly with the lens that is closest to image planes in the battery of lens apart from the distance control in image planes within 0.7 mm.

The foregoing is merely exemplary of embodiments of the present invention and reference should be made to the apparatus and structures herein not described in detail as it is known in the art to practice the same in general equipment and general methods.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A lens comprising a lens substrate (1) and a film structure (2) plated on at least one surface of said lens substrate (1), characterized in that said film structure (2) comprises a superposition of at least two of a first IR film system (21), a second IR film system (22) and a third AR film system (23).

2. The lens according to claim 1, characterized in that the film layer structure (2) has a passband, two transitions and two cut-off bands in the range of 350-1200 nm, the passband being located between the two cut-off bands and the transitions being located between the passband and the cut-off bands.

3. The lens according to claim 2, characterized in that the first IR film series (21) has a transmittance of more than 99% in the 400nm-670nm wavelength band and a cut-off in the 750nm-920nm wavelength band;

the second IR film system (22) has a transmittance of more than 99% in the 400nm-650nm band and a cut-off in the two bands of 350nm-400nm and 900-1200 nm.

4. The lens according to claim 1 or 3, characterized in that the lens substrate (1) is a resin lens or a glass-plastic hybrid lens.

5. The lens according to claim 1 or 3, characterized in that the lens substrate (1) is made of a plastic material and contains at least one long-wave absorbing component.

6. The lens according to claim 5, characterized in that the lens substrate (1) comprising a long-wave absorbing component has an average transmittance of 50% or more in the wavelength range of 350nm to 650nm and an average transmittance of 30% or less in the wavelength range of 700nm to 1100 nm.

7. The lens according to claim 1, characterized in that the first (21), second (22) and third AR (23) film series are structured as: (HL) N or (LH) N;

8. The lens according to claim 2 or 3, characterized in that the passband wavelength band of the film layer structure (2) is 400-680 nm, the average transmission is 95% or more;

9. The lens according to claim 2, characterized in that the shift amplitude of the wavelength corresponding to 50% of the light transmittance T of the film structure (2) is less than 25nm in the range of the change of the angle of incidence from 0 ° to 30 °.

10. The lens according to claim 2 or 9, characterized in that the steepness of the UV side and the IR side of the passband of the film layer structure (2) is less than 30 nm.

11. A lens barrel comprising the lens element according to any one of claims 1 to 10, comprising: the lens system comprises a lens barrel and a lens group arranged in the lens barrel, wherein the lens group at least comprises one lens;