CN103885098A - Lens unit - Google Patents
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- CN103885098A CN103885098A CN201310703585.9A CN201310703585A CN103885098A CN 103885098 A CN103885098 A CN 103885098A CN 201310703585 A CN201310703585 A CN 201310703585A CN 103885098 A CN103885098 A CN 103885098A
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Abstract
The invention provides a lens unit, namely a light-transmissive optical element that forms an anti-reflection surface by using fine protrusion, and protrusion damage can be prevented because of foreign object attachment or touch. In the lens unit (100), to a surface of each object side (L1) of a plurality of light-transmissive optical elements (lens 1, 2, 3, 4 and an infrared filter 6), and a surface of image side (L2), except a lens surface (1a) of the object side (L1) of the lens (1) (first light-transmissive optical element) that blocks the object side opening part (7a) of a holder (7), and at least one surface of the surface (6b) of the image side (L2) of the infrared filter (6) of the image side opening part (7b) of the holder (7). A plurality of fine protrusion of the substrate that forms light-transmissive optical element are used to form the anti-reflection surface.
Description
Technical field
The present invention relates to a kind of lens unit, this lens unit comprises the optical element that utilizes tiny multiple protuberances to form antireflection face.
Background technology
Thereby adopt a kind of surface at light transmission optical elements such as lens to form the technology of dielectric multilayer film formation antireflection face by evaporation, on the other hand, proposed in recent years a kind of surface at light transmission optical elements such as lens arrange multiple as Fig. 4 (a), thereby the tiny protuberance P of the nano-scale (b) forms the technology of antireflection face.As shown in Figure 4 (b), because refractive index changes continuously in the antireflection face of this structure, therefore can not form refractive index interface jumpy, so can reduce reflectivity.In the time forming this antireflection face, the technical scheme of a kind of utilization in the surface of light transmission optical element formation coating proposed.
And, following technical scheme is also proposed:, in the mould of shaping use, form in advance the small recess of multiple nano-scales, and utilize this mould light transmission optical element that is shaped, thereby tiny protuberance P illustrated accompanying drawing 4 is formed to light transmission optical element (with reference to patent documentation 1).
According to the technology of recording in this patent documentation 1, not only productivity is higher, and the base material self that forms light transmission optical element is with tiny protuberance P, therefore, the dielectric multilayer film that is different from overlay, formed by evaporation, it has advantages of can not produce peels off and the problems such as crackle.
Prior art document
Patent documentation
Patent documentation 1: No. 4986138 communique of Jap.P.
Summary of the invention
Invent technical task to be solved
But, in the case of utilizing tiny protuberance P to form the light transmission optical element of antireflection face, owing to easily adhering to the foreign matter etc. of moisture, the rubbish etc. of mist of oil, dewfall on antireflection face, therefore easily produce the problem that optical characteristics declines.In addition, if removal foreign matter and wiping antireflection face, there is the protuberance P problem that easily damaged, optical characteristics easily reduces.In addition, even if be not in order to remove foreign matter, if but contact antireflection face also exists the protuberance P problem that easily damaged, optical characteristics easily reduces.Therefore, for utilizing tiny protuberance P to form the light transmission optical element of antireflection face, the also present situation in extensively not popularized.
In view of the above problems, technical task of the present invention is to provide a kind of lens unit, in this lens unit, even utilize tiny protuberance to form the light transmission optical element of antireflection face, also can prevent from adhering to, contact and cause protuberance that breakage occurs because of foreign matter.
The method of technical solution problem
For solving the problems of the technologies described above, lens unit of the present invention comprises: multiple light transmission optical elements, and the plurality of light transmission optical element configures along optical axis, and the keeper of tubular, the keeper of this tubular keeps the plurality of light transmission optical element, described multiple light transmission optical element comprises multiple lens, it is characterized in that, for in the face of the object side separately of described multiple light transmission optical elements and the picture face of side, except block described keeper object side peristome the first light transmission optical element object side face and block at least one face the face of picture side of the second light transmission optical element of the picture side opening portion of described keeper, utilize the base material self that forms light transmission optical element with multiple tiny protuberance be configured to antireflection face.
In the application's invention, in the situation that using joint lens as light transmission optical element, so-called " face of the object side of light transmission optical element " represents the face of the object side that engages lens, and " face of the picture side of light transmission optical element " represents the face of the picture side that engages lens.
In the present invention, due to be formed at the reflection of light transmission optical element prevent face be utilize the base material self that forms light transmission optical element with the structure of multiple tiny protuberance, therefore, the structure of overlay and dielectric multilayer film is different from utilizing, and can not produce and peel off or the problem of crackle etc.In addition, due to the face of the object side separately of multiple light transmission optical elements and as in the face of side, except block keeper object side peristome the first light transmission optical element object side face and block keeper the second light transmission optical element as side opening portion as the face the face of side on form antireflection face, therefore can not occur to be attached to antireflection face, to cause the breakage of protuberance because of contact because of foreign matter.
In the present invention, the light transmission optical element that is formed with described antireflection face in preferred described multiple light transmission optical elements is made of plastics.For utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance, can be formed at any in the light transmission optical element of being made by glass and the light transmission optical element being made of plastics, but if the light transmission optical element that plastics are made can be manufactured at low cost by die forming.
In the present invention, preferably the containment member of ring-type is clamped between described the first light transmission optical element and described keeper, by this structure, foreign matter is difficult for entering between the first light transmission optical element and keeper, therefore can prevent that foreign matter is attached to antireflection face.
In the present invention, can adopt following structure:, the face of the object side separately of described multiple light transmission optical elements and as in the face of side, all form described antireflection face except the face of object side and all faces as the face of side of described the second light transmission optical element of described the first light transmission optical element.
In the present invention, can adopt the structure that forms described antireflection face at least one lens in described multiple lens.
In the present invention, preferably between any two lens in described multiple lens, configure aperture, and described antireflection face is at least formed on than described aperture on the lens near object side.On the lens near object side than aperture, be formed with preventing reflection horizon of being formed by overlay or dielectric multilayer film, produce and peel off or when crackle at overlay or dielectric multilayer film, it is upper that this bad part easily shines picture, but if utilize form light transmission optical element base material at least with the antireflection face of multiple tiny protuberance, can not produce this problem, therefore antireflection face can be set on the lens near object side than aperture.
In the present invention, preferably by described multiple lens, lens adjacent with respect to the most close object side of described aperture form described antireflection face as the face of side and with respect to the face of at least one party in the face of the most close object side as the adjacent lens of side of described aperture.Owing to concentrating all light near meeting in the lens of aperture, therefore, in the case of being formed with the anti-reflection layer being formed by overlay or dielectric multilayer film, produce and peel off or when crackle at overlay or dielectric multilayer film, the relatively easy change greatly of impact of this bad part, but if utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance, can not produce this problem, so can antireflection face be set near on the lens of aperture.
Can adopt in the present invention following structure:, described multiple lens comprise multiple plastic lenss, to in each face of multiple plastic lenss described in major general, except the face of the object side of described the first light transmission optical element the face by object side, be configured to described antireflection face.When being formed with on the lens that are positioned at object side in the situation of the anti-reflection layer being formed by overlay or dielectric multilayer film, produce and peel off or when crackle at overlay or dielectric multilayer film, it is upper that this bad part easily shines picture, but if utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance, can not produce this problem.Thus, by the present invention, on the face of the most close object side can be in each face of multiple plastic lenss, except the face of the object side of the first light transmission optical element, antireflection face is set.
In the present invention, the lens that are formed with described antireflection face in preferred described multiple lens have flange part at the outer circumferential side of lens face.By this structure, can utilize flange part protection to be formed at the antireflection face of lens face.
In the present invention, preferably the lens that are formed with antireflection face in described multiple lens have following structure:, the face that the whole face that is formed with the described lens face of at least one side of described antireflection face is compared a side of described flange part will more cave in to optical axis direction.By this structure, even in the case of the tabular surface facing to operator's console or pallet of a side that is formed with antireflection face is installed lens, the antireflection face that is formed at lens face also can not contact with operator's console or pallet.Therefore, can prevent that the antireflection face that is formed at lens face from damaging.
In the present invention, preferred described flange part comprises and the tabular surface of light shaft positive cross.By this structure, can be in the time of assembling lens unit, utilize chuck to adsorb the tabular surface of flange part, therefore can prevent that the antireflection face that is formed at lens face from damaging.
In the present invention, preferred described tabular surface is formed at the face of the object side of described flange part.By this structure, in the time of assembling lens unit, utilize chuck to adsorb the tabular surface of flange part, thus can be from the object side peristome installing lens of keeper.
In the present invention, be preferably formed with the stage portion that can connect with the annular component of sealing use of outer circumferential side that is embedded into this keeper at the outer peripheral face of described keeper.This structure has advantages of the picture side that makes foreign matter be difficult for travelling back across keeper.
In the present invention, can adopt following structure:, light transmission optical elements in described multiple light transmission optical elements, that be formed with described antireflection face are pressed in described keeper, so that the outer peripheral face of this light transmission optical element and the inner peripheral surface of described keeper are contacted.In the time that light transmission optical element is pressed in keeper, the outer peripheral face of light transmission optical element contacts with the inner peripheral surface of keeper, to light transmission optical element stress application, thereby light transmission optical element can deform, but, even if in this case, be different from overlay or dielectric multilayer film, utilize the base material this self that forms light transmission optical element with the antireflection face of multiple tiny protuberance still can not produce and peel off or crackle.
In the present invention, can adopt described multiple light transmission optical element all to can be the structure of lens.
In the present invention, also can adopt the structure of the infrared filter that described multiple light transmission optical element comprises the most close picture side.
In this case, also can adopt the mode that the face of the object side of optical filter is configured to described antireflection face.
Invention effect
In the present invention, due to be formed at the antireflection face of light transmission optical element be utilize the base material self that forms light transmission optical element with the structure of multiple tiny protuberances, therefore from utilize the structure of overlay or dielectric multilayer film different, can not produce and peel off or the problem of crackle etc.In addition, due to the face of the object side separately of multiple light transmission optical elements and as in the face of side, except block keeper object side peristome the first light transmission optical element object side face and block keeper the second light transmission optical element as side opening portion as the face the face of side on all form antireflection face, therefore can not produce and be attached to antireflection face, cause the problem of protuberance breakage because of contact because of foreign matter.
Brief description of the drawings
Fig. 1 is the key diagram of having applied lens unit of the present invention.
Fig. 2 is illustrated in to have applied the key diagram that the effect of flange part is set in lens unit of the present invention.
Fig. 3 is having applied be pressed into lens in lens unit of the present invention in the situation that, is applied to the key diagram of the stress on lens.
Fig. 4 is the key diagram that utilizes the antireflection face of tiny protuberance.
Embodiment
Describe having applied lens unit of the present invention with reference to accompanying drawing.
(structure of lens unit)
Fig. 1 is the key diagram of having applied lens unit of the present invention.In addition, in Fig. 1, below the face that is formed with anti-reflection layer in illustrated lens face represents with thick line.As shown in Figure 1, the lens unit 100 of present embodiment has multiple lens 1,2,3,4 and infrared filter 6, as the multiple light transmission optical elements along optical axis L configuration, light transmission optical element (lens 1,2,3,4 and infrared filter 6) is held in the keeper 7 of tubular.In the present embodiment, the lens 1(that is positioned at the most close object side L1 the first light transmission optical element in multiple light transmission optical elements) configure in the mode of the object side peristome 7a that blocks keeper 7, be positioned at infrared filter 6(the second light transmission optical element of the most close picture side L2) configure in the mode as the 7b of side opening portion of blocking keeper 7.In the present embodiment, multiple lens 1,2,3,4 formation visual angles are the wide-angle lens 11 of 150 degree to 190 degree.In addition, in the inner side of keeper 7, between lens 3 and lens 4, dispose aperture 5.
In the present embodiment, first group of lens 1() form by thering is negative dioptric glass lens.Specifically, the sphere that the lens face 1a of the object side L1 of lens 1 is convex, the sphere that is concavity as the lens face 1b of side L2.
Outer circumferential side at lens face 2a, the 2b of lens 2 has flange part 21, and the face 21a of the object side L1 of this flange part 21 is formed as the tabular surface of the ring-type vertical with optical axis L.In the present embodiment, at the object side L1 of lens 2, between lens face 2a and flange part 21, be formed with the one section of stage portion 22 towards picture side L2 depression that makes flange part 21.Therefore it is more outstanding to object side L1 that, lens face 2a compares flange part 21.The face 21b of picture side L2 of flange part 21 is identical with the face 21a of object side L1, is also formed as the tabular surface of the ring-type vertical with optical axis L.Here, at the picture side L2 of lens 2, between lens face 2b and flange part 21, be not formed with stage portion, will more cave in to object side L1 but lens face 2b compares the face 21b of the picture side L2 of flange part 21.
Lens 3 are formed by the plastic lens with positive diopter.Specifically, sphere or aspheric surface that the lens face 3a of the object side L1 of lens 3 is concavity, the sphere or the aspheric surface that are convex as the lens face 3b of side L2.
Outer circumferential side at lens face 3a, the 3b of lens 3 has flange part 31, and the face 31a of the object side L1 of this flange part 31 is formed as the tabular surface of the ring-type vertical with optical axis L.Therefore,, at the object side L1 of lens 3, the face 31a that lens face 3a compares the object side L1 of flange part 31 will more cave in to picture side L2.The face 31b of picture side L2 of flange part 31 is identical with the face 31a of object side L1, is also formed as the tabular surface of the ring-type vertical with optical axis L.Here at the picture side L2 of lens 3, between lens face 3b and flange part 31, be formed with one section of face 31b of the picture side L2 that makes flange part 31 towards the outstanding stage portion 32 of picture side L2.Therefore the face 31b that, lens face 3b compares the picture side L2 of flange part 31 will cave in to object side L1.
Lens 4 are formed by the plastic lens with positive diopter.Specifically, the sphere that the lens face 4a of the object side L1 of lens 4 is convex or for aspheric surface, the sphere that is convex as the lens face 4b of side L2 or be aspheric surface.Here, lens 4 are by cementing agent, the lens of object side L1 46 being consisted of with the joint lens that the lens 47 as side L2 engage, formed the lens face 4a of the object side L1 of lens 4 by the lens 46 of object side L1, formed the lens face 4b of the picture side L2 of lens 4 by the lens 47 as side L2.
These lens 4 are identical with lens 2,3, also have flange part 41 at the outer circumferential side of lens face 4a, 4b.The face 41a of the object side L1 of this flange part 41 is made up of the flange part of lens 46, and is formed as the tabular surface of the ring-type vertical with optical axis L.Here,, at the object side L1 of lens 4, between lens face 4a and flange part 41, be formed with and make a section of flange part 41 towards the outstanding stage portion 43 of object side L1.Therefore, lens face 4a compare the face 41a of the object side L1 of flange part 41 will be to picture side L2 depression.The face 41b as side L2 of flange part 41 is made up of the flange part of lens 47, and is formed as the tabular surface of the ring-type vertical with optical axis L.Here, at the picture side L2 of lens 4, between lens face 4b and flange part 41, be formed with stage portion 44, still, the face 41b that lens face 4b compares the picture side L2 of flange part 41 will give prominence to picture side L2.
In the present embodiment, if lens 46 and lens 47 are compared, the physical dimension of lens 46 that is positioned at object side L1 is larger than the physical dimension of lens 47.Therefore, in flange part 41, be formed with the stage portion 45 towards picture side L2.
(structures of keeper 7 grades)
Keeper 7 cylindrical shell for being formed from a resin, and having in optical axis L direction: the base plate 71 that is positioned at the perforate of rear side; From the outer peripheral edges cylindrical body portion 72 that (object side) extends towards front side of base plate 71; Be formed at the stage portion 73 of the ring-type of the front end of cylindrical body portion 72; And there is the diameter larger than cylindrical body portion 72 and the cylinder portion 7 from the outer peripheral edges of the stage portion 73 large footpath that (object side) extends towards front side.In addition, keeper 7 is not limited to resin and makes, and is also made up of metals such as aluminium.
In this keeper 7, on the face of the picture side L2 of base plate 71, with connect with the face 6a of the object side L1 of infrared filter 6 and with infrared filter 6 configure capturing element (without diagram) as the relative mode of the face 6b of side L2.In this state, being sealed by infrared filter 6 as side L2 of keeper 7.
The part of picture side L2 in the inner peripheral surface of the cylindrical body portion 72 of keeper 7, be formed with for offseting and fetch the stage portion 721 positioning with the flange part 41 of lens 4, with respect to the object side L1 of the lens 4 that positioned by stage portion 721, aperture 5, lens 3 and lens 2 are stacked gradually.In the present embodiment, lens 2, lens 3 are fixed on keeper 7 by being pressed into.Therefore, the positional precision of lens 2, lens 3 is higher, thereby can form high-resolution lens unit 100.
In the inner side of the cylinder portion 74 in the large footpath of keeper 7, utilize stage portion 73 to position lens 1.In addition, by the end of cylinder portion 74 is riveted and is fixed lens 1.At this moment, also may be by lens 1 by lens 2,3,4 towards pressing as side L2, thereby become the state of having fixed lens 2,3,4.In addition, also may be after lens 3,4 be configured in to the inner side of keeper 7, then lens 2 are pressed into, thereby fixed lens 3,4.
Here, be formed with the recess 730 of ring-type in stage portion 73, the recess 730 of this ring-type holds the containment member 18 of the ring-type being made up of rubber etc., in the time of fixed lens 1, containment member 81 is occurring under the state after elastic deformation, becomes the state being clamped between lens 1 and the stage portion 73 of keeper 7.Therefore, the sealed member 81 of the object side L1 of keeper 7 seals.In addition, as the containment member 81 of ring-type, can adopt the cementing agent that is applied as ring-type, in this case, both can adopt the structure of the recess 730 that configuration containment member 81 is set, also can adopt the structure that recess 730 is not set.
On the outer peripheral face of the cylindrical body portion 72 of keeper 7, be formed with the stage portion 76 of the annular component 82 that disposes sealing use.Therefore,, in the time lens unit 100 being installed in to the framework 200 of optical devices etc., the annular component 82 of sealing use is clamped between the stage portion 76 of keeper 7 and the stage portion 210 of framework 200 there is the state after elastic deformation.Therefore, the picture side L2 of the picture side L2(keeper 7 of lens unit 100) sealed by annular component 82.Here, framework 200 surrounds the object side L1 entirety that comprises lens 100 and capturing element except the face of the object side L1 of lens unit 100.In addition, the distribution material of drawing towards the outside of framework 200 from capturing element is through being formed at the distribution lead division in hole etc. of framework 200, and the sealed material of this distribution lead division fills.
(antireflection face)
In the lens unit 100 forming like this, for multiple light transmission optical element (lens 1, 2, 3, 4 and infrared filter 6) in the face of object side L1 separately and the face of picture side L2, except blocking the lens 1(first light transmission optical element of object side peristome 7a of keeper 7) object side L1 lens face 1a and block infrared filter 6(the second light transmission optical element of the picture 7b of side opening portion of keeper 7) the face 6b of picture side L2 at least one face, utilize form light transmission optical element base material self with multiple tiny protuberance be configured to antireflection face.
More specifically, lens 2 are plastic lens, this plastic lens utilizes No. 4986138 communique of patent documentation 1(Jap.P.) etc. in the mould that is formed with multiple tiny recesses recorded form and form, for the lens face 2a of the object side L1 of lens 2 and the lens face 2b of picture side L2, utilize the base material (plastics) self that forms lens 2 with the illustrated tiny protuberance P of multiple accompanying drawings 4 be configured to antireflection face.
In addition, lens 3 are identical with lens 2, also be to utilize the mould that is formed with multiple tiny recesses to form the plastic lens forming, for the lens face 3a of the object side L1 of lens 3 and the lens face 3b of picture side L2, utilize the base material (plastics) that forms lens 3 from it with the illustrated tiny protuberance P of multiple accompanying drawings 4 be configured to antireflection face.
In addition, form lens 4(and engage lens) lens 46,47 identical with lens 2, also be to utilize the mould that is formed with multiple tiny recesses to form the plastic lens forming, for the lens face 4a of the object side L1 of lens 4 and the lens face 4b of picture side L2, utilize the base material (plastics) self that forms lens 2 with the illustrated tiny protuberance P of multiple accompanying drawings 4 be configured to antireflection face.In addition, for the joint of lens 46,47, using with the specific refractivity of lens 46,47 is the cementing agent below 0.2, therefore can ignore the reflection on the composition surface of lens 46,47.Thus, do not form above-mentioned antireflection face in the composition surface side of lens 46,47.
In addition, in the present embodiment, above-mentioned antireflection face, according to using the spacing of wavelength coverage to protuberance P and highly setting, makes roughly at wavelength 550nm, minimum reflectance to be shown, roughly at wavelength 400nm to the scope of wavelength 800nm, the reflectivity below 1% is shown.
(the main effect of present embodiment)
As described above, in the lens unit 100 of present embodiment, for multiple light transmission optical element (lens 1, 2, 3, 4 and infrared filter 6) in the face of object side L1 separately and the face of picture side L2, except blocking the lens 1(first light transmission optical element of object side peristome 7a of keeper 7) object side L1 lens face 1a and block infrared filter 6(the second light transmission optical element of the picture 7b of side opening portion of keeper 7) the face 6b of picture side L2 at least one face, utilize the base material self that forms light transmission optical element with multiple tiny protuberance be configured to antireflection face.More specifically, in lens 2, for the lens face 2b of the lens face 2a of object side L1 and picture side L2, utilize the base material (plastics) self that forms lens 2 with multiple tiny protuberance P be configured to antireflection face.And, in lens 4, for the lens face 4b of the lens face 4a of object side L1 and picture side L2, utilize the base material (plastics) self that forms lens 2 with multiple tiny protuberance P be configured to antireflection face.Therefore, the lens face 2a of lens 2,2b, the lens face 3a of lens 3, the lens face 4a of 3b and lens 4,4b reflectivity is lower, so the optical characteristics of lens unit 100 is good.
In addition, because antireflection face adopts following structure:, utilize and form lens 2,3,4(light transmission optical element/plastic lens) base material self (plastics) with multiple tiny protuberance P, therefore, the structure of overlay or dielectric multilayer film is different from utilizing, and can not produce and peel off and the problems such as crackle.
In addition, in lens unit 100, the lens face 2a of lens 2, the lens face 3a of 2b, lens 3, the lens face 4a of 3b and lens 4, these all faces of 4b can not expose object side L1 and picture side L2, therefore, moisture and the rubbish etc. of mist of oil, dewfall are difficult for being attached to antireflection face.In addition, also can not cause because of object the situation of protuberance P breakage with respect to above-mentioned antireflection surface vibration.Thus, even if the lens unit of present embodiment 100 is used in the situation of the harsher environment such as vehicle mounted or monitoring camera, be also difficult for occurring adhering to or the optical characteristics that causes because of the damage of protuberance P reduces because of foreign matter.
In addition, because lens 2,3,4 are plastic lens, and form and have the antireflection face that has utilized tiny protuberance P in this plastic lens, therefore can manufacture at low cost by die forming.
In addition, due at lens 1(the first light transmission optical element) and keeper 7 between clamping have the containment member 81 of ring-type, therefore the foreign matter such as mist of oil, water vapor or moisture and tiny rubbish is difficult for entering between lens 1 and keeper 7.Therefore, can prevent that foreign matter is attached to the lens face 2a of lens 2, the lens face 3a of 2b, lens 3, the lens face 4a of 3b and lens 4, the antireflection face of 4b etc.
In addition, be formed with stage portion 76 at the outer peripheral face of keeper 7, this stage portion 76 can connect with the annular component 82 of sealing use of the outer circumferential side that is embedded into keeper 7.Therefore, have foreign matters such as making mist of oil, water vapor or moisture and tiny rubbish be difficult between keeper 7 and framework 200 around this advantage of picture side L2 to keeper 7.
In addition, more be formed with the anti-reflection layer being formed by overlay or dielectric multilayer film by the lens 2 of object side L1 in the case of comparing aperture 5, produce while peeling off with crackle at overlay or dielectric multilayer film, it is upper that this bad part is easily shone picture, but if utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance P, can not produce this problem.That is to say, even not imaging in the lens 2,3 away from from capturing element, but compared with lens 4, also become the state that approaches imaging, therefore, produce at overlay or dielectric multilayer film place and peel off or when crackle, it is upper that this bad part is easily shone picture, but if utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance P, can not produce this problem.Can compare aperture 5 more by antireflection face being set on the lens 2,3 of object side L1 thus.
In addition, in the case of being formed with the anti-reflection layer being formed by overlay or dielectric multilayer film near on the lens 3,4 of aperture 5, when producing, overlay or dielectric multilayer film peel off or when crackle, it is upper that this bad part is easily shone picture, but if utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance, can not produce this problem.That is to say, in the situation of wide-angle lens, efficient light can focus in the face of aperture 5, and therefore effective range narrows.In addition, near in the lens of aperture, concentrated all light.Therefore, if peeling off or crackle of the anti-reflection layer being formed by overlay or dielectric multilayer film near generation on the lens 3,4 of aperture 5, the Area Ratio of the abnormality of unit useful area becomes large, and the impact of reflectivity reduction, scattered light increase etc. is larger, but if utilize the base material self that forms light transmission optical element with the antireflection face of multiple tiny protuberance P, be difficult for producing this problem.Thus, can antireflection face be set near on the lens 3,4 of aperture 5.
(effect of the flange part 21,31 of present embodiment)
Fig. 2 is illustrated in the key diagram of having applied in lens unit 100 of the present invention, lens having been arranged to the effect of flange part, Fig. 2 (a), (b) be the key diagram that represents the effect of the flange part 21 of the lens 2 that are arranged at second from object side, and from object side, be arranged at the key diagram of the effect of the flange part 31 of the lens 3 of the 3rd.
As shown in Fig. 2 (a), the outer circumferential side of lens face 2a, 2b in the lens 2 that are provided with above-mentioned anti-reflection layer is formed with flange part 21.Therefore, can protect lens face 2a, 2b(antireflection face by flange part 21).More specifically,, on the face of the picture side L2 of the antireflection face that is formed with in lens 2, the face 21b that lens face 2b compares the picture side L2 of flange part 21 will more cave in to optical axis direction.Therefore, even in the situation that the face 2b as side L2 of the antireflection face that is formed with of lens 2 is placed towards the tabular surface T of worktable or pallet, be formed at lens face 2b(antireflection face) tiny protuberance P also can not contact with the tabular surface T of worktable or pallet.Therefore, can prevent from being formed at lens face 2b(antireflection face) tiny protuberance P damage.In addition, the face 21a of the object side L1 in flange part 21 is the tabular surface orthogonal with optical axis L, and the width dimensions of this tabular surface is more than 0.5mm.Therefore, as shown by arrow C, can be in the time of assembling lens unit 100, utilize chuck to adsorb the face 21a(tabular surface of the object side L1 of flange part 21), thus can prevent from being formed at lens face 2a(antireflection face) tiny protuberance P damage.
In addition, as shown in Fig. 2 (b), the outer circumferential side of lens face 3a, 3b in the lens 3 that are provided with above-mentioned anti-reflection layer is formed with flange part 31.Therefore, can protect lens face 3a, 3b(antireflection face by flange part 31).More specifically,, at the face of the picture side L2 of the antireflection face that is formed with of lens 3, the face 31b that lens face 3b compares the picture side L2 of flange part 31 will more cave in to optical axis direction.Therefore, even in the case of by the face 31b as side L2 of the antireflection face that is formed with of lens 3 towards the tabular surface T of worktable or pallet places, be formed at lens face 3b(antireflection face) tiny protuberance P also can not contact with the tabular surface T of worktable or pallet.Therefore, can prevent from being formed at lens face 3b(antireflection face) tiny protuberance P damage.In addition, the face 31a of the object side L1 in flange part 31 is the tabular surface orthogonal with optical axis L, and the width dimensions of this tabular surface is more than 0.5mm.Therefore, as shown by arrow C, can be in the time of assembling lens unit 100, utilize chuck to adsorb the face 31a(tabular surface of the object side L1 of flange part 31), thus can prevent from being formed at lens face 3a(antireflection face) tiny protuberance P damage.
And as shown in Figure 1, the outer circumferential side of lens face 4a, 4b in the lens 4 that are provided with above-mentioned anti-reflection layer is formed with flange part 41.Therefore, can protect lens face 4a, 4b(antireflection face by flange part 41).More specifically, in the face of the picture side L2 of the antireflection face that is formed with in lens 4, the face 41b that lens face 4b compares the picture side L2 of flange part 41 will more give prominence to optical axis direction, but owing to being formed with flange part 41, thereby as long as be formed with the recess contacting with lens face 4b for avoiding on worktable or pallet, just can carry out support of lens 4 with the face 41b as side L2 of flange part 41.Therefore, though in the case of by the antireflection face that is formed with in lens 4 as the placing facing to worktable or pallet of side L2, be formed at lens face 4b(antireflection face) tiny protuberance P also can not contact with the tabular surface T of worktable or pallet.Therefore, can prevent from being formed at lens face 4b(antireflection face) tiny protuberance P damage.In addition, the face 41a of the object side L1 in flange part 41 is the tabular surface orthogonal with optical axis L, and the width dimensions of this tabular surface is more than 0.5mm.Therefore, can be in the time of assembling lens unit 100, utilize chuck to adsorb the face 41a(tabular surface of the object side L1 of flange part 41), thus can prevent from being formed at lens face 4a(antireflection face) tiny protuberance P damage.
And, in the arbitrary lens in the lens 2,3,4 that are provided with above-mentioned anti-reflection layer, all can utilize chuck from object side L1 absorption flange part 21,31,41.Thus, easily install lens 2,3,4 from the object side peristome 7a of keeper 7.
(fixed sturctures of lens 2)
Fig. 3 is having applied while being pressed into lens 2 in lens unit 100 of the present invention, is applied to the key diagram of the stress on lens 2.
In the above-described embodiment, in employing, lens 3,4 are disposed to the interior rear flank of keeper 7, then are pressed in the situation of structure of lens 2, the outer circumferential side of lens 2 contacts with the inner peripheral surface of keeper 7.Consequently, can apply the stress shown in Fig. 3 arrow F to lens 2, lens 2 deform as shown in dot-and-dash line.Even in this case, due to lens face 2a, the 2b(antireflection face of lens 2) as utilize the base material self that forms lens 2 with the antireflection face of multiple tiny protuberance P, therefore different from overlay or dielectric multilayer film, can not produce and peel off or crackle.
(other embodiments)
In the above-described embodiment, by the lens face 2a of lens 2, the lens face 3a of 2b, lens 3, the lens face 4a of 3b and lens 4,4b is made as above-mentioned antireflection face, but also lens 1 can be made as to plastic lens, and the lens face 1b as side L2 is made as to above-mentioned antireflection face.By this structure, can by the face of the object side L1 separately of the lens that use in lens unit 100 1,2,3,4 and as in the face of side L2, except blocking the 1(first light transmission optical element of object side peristome 7a of keeper 7) the lens face 1a of object side L1 all faces be all made as above-mentioned antireflection face.In addition, if lens 1 are made as to plastic lens, lens face 1b as side L2 is made as to above-mentioned antireflection face, the plastic lens of object side L1 that leans on most in multiple plastic lenss (lens 1,2,3,4) can be configured to above-mentioned antireflection face, in this case, also can be by except blocking the lens 1(first light transmission optical element of object side peristome 7a of keeper 7) the face of object side L1 at least one face be configured to above-mentioned antireflection face.
And, base material that also can be using plastics as infrared filter 6, and the face 6a of the object side L1 of this infrared filter 6 is made as to above-mentioned antireflection face.By this structure, can be by the face of the face of the object side L1 separately of the light transmission optical element using in lens unit 100 (lens 1,2,3,4 and infrared filter 6) and picture side L2, except blocking the lens 1(first light transmission optical element of object side peristome 7a of keeper 7) object side L1 lens face 1a and block the infrared filter 6(second light transmission optical element that looks like the 7b of side opening portion of keeper 7) all faces as the face 6b of side L2 be all made as above-mentioned antireflection face.
In addition, also can adopt and optimize the spacing and the height that form the protuberance P that antireflection face uses, to block ultrared structure.By this structure, can omit infrared filter 6, and only utilize the light transmission optical element being formed by lens to form lens unit 100.
In addition, in the above-described embodiment, the second light transmission optical element as the 7b of side opening portion of blocking keeper 7 is infrared filter 6, and the second light transmission optical element as the 7b of side opening portion of still blocking keeper 7 can be also lens.
In addition, show in the above-described embodiment the lens arrangement that applies the present invention to four groups five pieces, but also can apply the present invention in the lens unit of five groups six pieces any lens arrangements such as grade.For example, also 2 pieces or 3 pieces, lens.
Reference numeral
1 lens (light transmission optical element/the first light transmission optical element)
2,3,4 lens (light transmission optical element)
1a, 2a, 3a, 4a lens face (face of the object side of lens)
1b, 2b, 3b, 4b lens face (face of the picture side of lens)
5 apertures
6 infrared filters (light transmission optical element/the second light transmission optical element)
The face of the object side of 6a infrared filter
The face of the picture side of 6b infrared filter
7 keepers
7a object side peristome
7b is as side opening portion
76 stage portion
81 containment members
82 annular components
100 lens units
L optical axis
L1 object side
L2 is as side
Claims (17)
1. a lens unit, this lens unit has:
Multiple light transmission optical elements, the plurality of light transmission optical element configures along optical axis; And
The keeper of tubular, the keeper of this tubular keeps described multiple light transmission optical elements,
Described multiple light transmission optical element comprises multiple lens,
It is characterized in that,
For the face of the object side separately of described multiple light transmission optical elements and as among the face of side, except block described keeper object side peristome the first light transmission optical element object side face and block at least one face the face of picture side of the second light transmission optical element of the picture side opening portion of described keeper, the base material self that utilizes formation light transmission optical element with multiple tiny protuberance be configured to antireflection face.
2. lens unit according to claim 1, is characterized in that,
The light transmission optical element that is formed with described antireflection face in described multiple light transmission optical element is made of plastics.
3. lens unit according to claim 1, is characterized in that,
The containment member of ring-type is clamped between described the first light transmission optical element and described keeper.
4. lens unit according to claim 2, is characterized in that,
For all faces in the face of the object side separately of described multiple light transmission optical elements and the picture face of side, except the face of object side of described the first light transmission optical element and the face of the picture side of described the second light transmission optical element, it is all configured to described antireflection face.
5. lens unit according to claim 2, is characterized in that,
On at least one lens in described multiple lens, form described antireflection face.
6. lens unit according to claim 5, is characterized in that,
Between any two lens in described multiple lens, dispose aperture,
Described antireflection face is at least formed on the lens of comparing the more close object side of described aperture.
7. lens unit according to claim 5, is characterized in that,
Between any two lens in described multiple lens, dispose aperture,
The lens adjacent with respect to the most close object side of described aperture are configured to described antireflection face as the face of side and with respect to the face of at least one party in the face of the most close object side as the adjacent lens of side of described aperture.
8. lens unit according to claim 5, is characterized in that,
Described multiple lens comprise multiple plastic lenss,
To in each face of multiple plastic lenss described in major general, except the face of the object side of described the first light transmission optical element, the face of close object side is configured to described antireflection face.
9. according to the lens unit described in any one in claim 5 to 8, it is characterized in that,
The lens that are formed with described antireflection face in described multiple lens have flange part at the outer circumferential side of lens face.
10. lens unit according to claim 9, is characterized in that,
The lens that are formed with described antireflection face in described multiple lens have following structure:, the face that the whole face that is formed with the described lens face of at least one side in antireflection face is compared a side of described flange part will more cave in to optical axis direction.
11. lens units according to claim 10, is characterized in that,
Described flange part has the tabular surface with light shaft positive cross.
12. lens units according to claim 11, is characterized in that,
Described tabular surface is formed at the face of the object side of described flange part.
13. lens units according to claim 1, is characterized in that,
On the outer peripheral face of described keeper, be formed with the stage portion that can connect with the annular component of sealing use of outer circumferential side that is embedded into this keeper.
14. lens units according to claim 1, is characterized in that,
For light transmission optical elements in described multiple light transmission optical elements, that be formed with described antireflection face, be pressed in described keeper, so that the outer peripheral face of this light transmission optical element and the inner peripheral surface of described keeper are contacted.
15. lens units according to claim 1, is characterized in that,
Described multiple light transmission optical element is lens.
16. lens units according to claim 1, is characterized in that,
Described multiple light transmission optical element comprises the infrared filter of the most close picture side.
17. lens units according to claim 16, is characterized in that,
The face of the object side of described infrared filter is configured to described antireflection face.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-278233 | 2012-12-20 | ||
| JP2012278233A JP6234676B2 (en) | 2012-12-20 | 2012-12-20 | Lens unit |
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| Publication Number | Publication Date |
|---|---|
| CN103885098A true CN103885098A (en) | 2014-06-25 |
Family
ID=50954090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310703585.9A Pending CN103885098A (en) | 2012-12-20 | 2013-12-19 | Lens unit |
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| Country | Link |
|---|---|
| JP (1) | JP6234676B2 (en) |
| CN (1) | CN103885098A (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2014122971A (en) | 2014-07-03 |
| JP6234676B2 (en) | 2017-11-22 |
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Application publication date: 20140625 |