CN101414043A - Fixing method, optical component and pickup manufactured by the fixing method - Google Patents

Fixing method, optical component and pickup manufactured by the fixing method Download PDF

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Publication number
CN101414043A
CN101414043A CNA2008102151975A CN200810215197A CN101414043A CN 101414043 A CN101414043 A CN 101414043A CN A2008102151975 A CNA2008102151975 A CN A2008102151975A CN 200810215197 A CN200810215197 A CN 200810215197A CN 101414043 A CN101414043 A CN 101414043A
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China
Prior art keywords
light
optical element
fixing means
optical
wavelength region
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CNA2008102151975A
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Chinese (zh)
Inventor
石田一夫
丰泉义孝
中条悦三
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Konica Minolta Opto Inc
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Konica Minolta Opto Inc
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Publication of CN101414043A publication Critical patent/CN101414043A/en
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Abstract

The invention provides a fixing method, an optical component and a pickup manufactured by the fixing method, for reducing deterioration of transmission characteristic in a wavelength region intended for the use of an optical element, in fixing an optical element such as a plastic objective lens using a UV-curing type adhesive. In a position facing the emitting end of a light guiding member 55, a composite objective lens 20 is arranged in a state it is placed on a bobbin 40, wherein a fixing part 31 supplied to a proper place between the composite objective lens 20 and a lens supporting part 41 is exposed to the UV-curing ray and hardened in a short period of time.

Description

Fixing means, the optical element and the optical take-up apparatus that use this method to make
It is dividing an application of 200510075973.2 application for a patent for invention that the application's name that to be Konica Minolta Opto Inc submit on May 27th, 2005 is called " fixing means, the optical element and the optical take-up apparatus that use this method to make ", application number.
Technical field
The present invention relates to be used for fixing the fixing means of optical element such as plastic lens and use this fixing means that the optical element and the optical take-up apparatus of optical element such as object lens are installed.
Background technology
Now, for CD (Compact Disc), DVD (Digital Versatile Disc), BD CDs such as (Blu-ray Disc) being carried out the reproduction record of information, just developing and making various optical take-up apparatus (with reference to patent documentation 1).As the object lens that are assembled in this optical take-up apparatus because in light weight and the focusing and follow the tracks of favourable, so use plastics system lens more.This plastics system object lens for example are adhesively fixed on the movable member that optical take-up apparatus is used by resin adhesive, promptly on the coil rack.
Patent documentation 1: the spy opens flat 10-162407 communique
Use in the volume production operation of optical take-up apparatus in CD usefulness of popularizing now and DVD, the UV curing type bonding agents that use in order to ensure rapid manufacturing process and in object lens fixing more, but when in the BD of short wavelength side volume production operation, being suitable for same technology like this, just produce following problem with optical take-up apparatus etc.
Distinguished by experiment of present inventor etc., when UV curing type bonding agent is solidified, will be to the strong UV light of plastic object lens WBR, so for the plastics system object lens of particular types, it makes the transmissison characteristic as the blue coloured light of application target and ultraviolet light worsen after assembling.Plastics system object lens in the past more to be used in region of ultra-red and visible wavelength region, did not also have by strong UV rayed the transmissison characteristic deterioration problem of locating plastics system object lens at ultraviolet light etc.
But, carry out with blue coloured light and ultraviolet light in the volume production operation of novel optical take-up apparatus of record-playback, when in the installation of plastics system object lens, using UV curing type bonding agent, as mentioned above, worsen as the blue coloured light of plastics system object lens application target and the transmissison characteristic of ultraviolet light, the precision of information regeneration and record reduces, the performance that might can not get wishing.
Summary of the invention
The object of the present invention is to provide a kind of fixing means of used for optical elements, it is utilizing UV curing type bonding agent fixedly the time, can be reduced in the deterioration as the wavelength region may transmissison characteristic of optical element application target to optical elements such as plastics system object lens.
And the object of the present invention is to provide a kind of optical take-up apparatus, it possesses optical element and this optical element of assembling that uses the fixing optical element that waits of said fixing method.
Purpose of the present invention can reach by following structures.
First fixing means of the present invention, be being arranged in the plastics system optical element that the regulation that comprises blue coloured light and ultraviolet wavelength scope at least uses wavelength region may to use, the fixing means that utilizes light-cured type bonding agent and other adhering components to use, it possesses: (a) operation (b) that the light-cured type bonding agent is supplied with to the bonding position of optical element and other parts is by handling the operation that light is cured to the irradiation of bonding position and the light-cured type bonding agent selectively.At this, said handling light selectively to the irradiation of bonding position, only be meant basically and supply with to bonding position and periphery thereof, but also comprise to the outside of bonding position and periphery thereof that for example the processing light injected such as optical surface relatively carries out dim light handling light.But also comprise to from bonding position and the processing light injected of the position left of periphery, for example keep the processing light of injecting in addition at problematic position and supply with to characteristics such as optical surfaces.
When above-mentioned fixing means is cured at the light-cured type bonding agent, shine selectively to bonding position handling light, so, can reduce by the optical surface of this processing light by optical element being injected into the deterioration of optical element that body interior causes to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
Second fixing means of the present invention, be being arranged in the plastics system optical element that the regulation that comprises blue coloured light and ultraviolet wavelength scope at least uses wavelength region may to use, the fixing means that utilizes light-cured type bonding agent and other adhering components to use, it possesses: (a) operation that the light-cured type bonding agent is supplied with to the bonding position of optical element and other parts; (b) operation that this light-cured type bonding agent is cured: it solidifies the light-cured type bonding agent, but it is that the processing light from the solid-state light emitting element with following characteristic is shone to light-cured type bonding agent and periphery thereof, and this described characteristic is substantially to reduce optical element to use the assurance of the deterioration in optical properties of wavelength region may to solidify in the wavelength region may luminous in regulation.At this, guarantee to solidify the characteristics of luminescence intensity of wavelength region may, though be necessary on suitably solidifying,, then need the processing time of extending in intensity hour according to situation such as purposes and the fixing bonding agent of usefulness.
When above-mentioned fixing means is cured at the light-cured type bonding agent, be that the processing light from the solid-state light emitting element with following characteristic is shone to light-cured type bonding agent and periphery thereof, this described characteristic is substantially to reduce optical element to use the assurance of the deterioration in optical properties of wavelength region may to solidify in the wavelength region may luminous in regulation, so, can reduce the deterioration of the optical element that causes to injecting of optical element by this processing light to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
The 3rd fixing means of the present invention, be being arranged in the plastics system optical element that the regulation that comprises blue coloured light and ultraviolet wavelength scope at least uses wavelength region may to use, the fixing means that utilizes light-cured type bonding agent and other adhering components to use, it possesses: (a) operation that the light-cured type bonding agent is supplied with to the bonding position of optical element and other parts; (b) operation that this light-cured type bonding agent is cured: it solidifies the light-cured type bonding agent, but it shines following light to light-cured type bonding agent and periphery thereof, this described light is substantially to reduce optical element to use first wavelength region may of the deterioration in optical properties of wavelength region may to have the characteristics of luminescence of prescribed strength (normally maximum intensity) in regulation, and when being present in the ultraviolet region than the first wavelength region may short wavelength side, making optical element use the characteristics of luminescence of second wavelength region may of the deterioration in optical properties of wavelength region may to reduce to light below the regulation with respect to afore mentioned rules intensity in regulation in fact.At this,,,, then need the processing time of extending in its intensity hour though be necessary on suitably solidifying according to situations such as purposes and the fixing bonding agent of usefulness for the prescribed strength of the first wavelength region may characteristics of luminescence.And the characteristics of luminescence of the characteristics of luminescence of second wavelength region may with respect to the prescribed strength of first wavelength region may reduced to below the regulation, be respectively the luminescence peak and the luminous zone that exist in second wavelength region may to be set at object, consequently the maximum emission intensity of second wavelength region may becomes problem.When the characteristics of luminescence of the characteristics of luminescence of first wavelength region may and second wavelength region may is compared, can utilize relative intensity (being exactly the spectral distribution of for example in relative exposure, representing specifically).
Above-mentioned fixing means is when being cured the light-cured type bonding agent, following light is shone to light-cured type bonding agent and periphery thereof, this light is present in than the ultraviolet region of the first wavelength region may short wavelength side and making optical element use the characteristics of luminescence of second wavelength region may of the deterioration in optical properties of wavelength region may to reduce to below the regulation with respect to prescribed strength in regulation in fact, so, can reduce the deterioration of the optical element that causes to injecting of optical element by this light to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
The 4th fixing means of the present invention, be being arranged in the plastics system optical element that the regulation that comprises blue coloured light and ultraviolet wavelength scope at least uses wavelength region may to use, the fixing means that utilizes light-cured type bonding agent and other adhering components to use, it possesses: (a) operation (b) that the light-cured type bonding agent is supplied with to the bonding position of optical element and other parts operation that this light-cured type bonding agent is cured: it solidifies the light-cured type bonding agent, but it shines following light to light-cured type bonding agent and periphery thereof, this described light is more than or equal to first intensity reducing substantially that optical element uses the deterioration in optical properties of wavelength region may in regulation the characteristics of luminescence of first wavelength region may is set at, when being present in the ultraviolet region than the first wavelength region may short wavelength side, be to be less than or equal to second intensity making optical element use the characteristics of luminescence of second wavelength region may of the deterioration in optical properties of wavelength region may to be set in regulation in fact.
Above-mentioned fixing means is when being cured the light-cured type bonding agent, following light is shone to light-cured type bonding agent and periphery thereof, this light is present in than the ultraviolet region of the first wavelength region may short wavelength side and making optical element use the characteristics of luminescence of second wavelength region may of the deterioration in optical properties of wavelength region may to be set in regulation in fact and is less than or equal to second intensity, so, can reduce the deterioration of the optical element that causes to injecting of optical element by this light to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
Optical element of the present invention possesses optical element and other parts that interfixed by the said fixing method.
Optical element according to described first fixing means, when the light-cured type bonding agent is cured, shine selectively to bonding position handling light, so, can reduce by this processing light optical surface by optical element etc. being injected into the deterioration of optical element that body interior causes to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
Optical element according to described second fixing means, when its light-cured type bonding agent in usefulness that optical element and other parts are interfixed is cured, processing light from the solid-state light emitting element with following characteristic is shone to light-cured type bonding agent and periphery thereof, this described characteristic is substantially to reduce optical element to use the assurance of the deterioration in optical properties of wavelength region may to solidify in the wavelength region may luminous in regulation, so, can reduce the deterioration of the optical element that causes to injecting of optical element by this processing light to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
Optical element according to described third and fourth fixing means, it is when being used for light-cured type bonding agent that optical element and other parts interfix and being cured, the light that makes optical element use the characteristics of luminescence of second wavelength region may of the deterioration in optical properties of wavelength region may to be reduced to less than in regulation in fact or equal to stipulate to light-cured type bonding agent and periphery irradiation thereof, so, can reduce the deterioration of the optical element that causes to injecting of optical element by this light to the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
The optical element of the present invention's first fixing means possesses: (a) regulation in comprising blue coloured light and ultraviolet wavelength scope is at least used the plastics system optical element that uses in the wavelength region may; (b) to be bonded in other parts on the optical element; (c) form by the light-cured type bonding agent, and by photocuring optical element and other adhering components at the adhering device (d) at the bonding position of regulation when the light-cured type bonding agent is cured, processing light is shone selectively to bonding position.
The optical element of the present invention's second fixing means possesses: (a) be arranged in plastics system optical element (b) that the regulation that comprises blue coloured light and ultraviolet wavelength scope at least uses wavelength region may to use and should be bonded in other parts on the optical element; (c) form by the light-cured type bonding agent, and by photocuring optical element and other adhering components adhering device at the bonding position of regulation, (d) when the light-cured type bonding agent is cured, the light-cured type bonding agent is solidified, but it is that the processing light from the solid-state light emitting element with following characteristics of luminescence is shone to light-cured type bonding agent and periphery thereof, and this described characteristics of luminescence is to reduce optical element in fact to use the assurance of the deterioration in optical properties of wavelength region may to solidify in the wavelength region may luminous in regulation.
The optical element of the present invention's third and fourth fixing means possesses: (a) regulation in comprising blue coloured light and ultraviolet wavelength scope is at least used the plastics system optical element that uses in the wavelength region may; (b) should be bonded in other parts on the optical element; (c) form by the light-cured type bonding agent, and by photocuring optical element and other adhering components adhesion means at the bonding position of regulation, (d) when the light-cured type bonding agent is cured, the light-cured type bonding agent is solidified, but it shines following light to light-cured type bonding agent and periphery thereof, this described light is substantially to reduce optical element to use first wavelength region may of the deterioration in optical properties of wavelength region may to have the characteristics of luminescence of prescribed strength (normally maximum intensity) in regulation, and when being present in the ultraviolet region than the first wavelength region may short wavelength side, making optical element use the relative afore mentioned rules intensity of the characteristics of luminescence of second wavelength region may of the deterioration in optical properties of wavelength region may to reduce to light below the regulation in regulation in fact.
Above-mentioned optical element also can be injected into optical element that body interior causes to the processing light of being used by photocuring and the light optical surface by optical element etc. to be reduced the deterioration of the optical characteristics such as transmissivity of blue coloured light and ultraviolet light.Therefore, behind assembling plastics system optical element, can reduce the deterioration of its performance.
The stationary installation of the present invention's first fixing means, (a) be to be used for utilizing the plastics system optical element that the regulation in comprising blue coloured light and ultraviolet wavelength scope at least uses wavelength region may to use light-cured type bonding agent and other parts to carry out the stationary installation of bonding usefulness, it possesses: (b) device that the light-cured type bonding agent is supplied with to the bonding position of optical element and other parts; (c) by handling the light irradiation device that light is cured to the irradiation of bonding position and the light-cured type bonding agent selectively.
Said fixing, by existing handling the light irradiation device that luminous energy shines selectively, can be injected into optical element that body interior causes to the optical surface of the processing light of using by photocuring by optical element etc. the deterioration of the optical characteristics such as transmissivity of blue coloured light and ultraviolet light is reduced.Therefore, behind assembling plastics system optical element, can prevent the deterioration of its performance.
Optical take-up apparatus of the present invention possesses above-mentioned optical element, can read the information on the optical recording media record surface, or information is write to this record surface.
Described optical take-up apparatus is owing to having used described fixing means fixedly waiting of optical elements such as object lens, so can realize that recording of information reproduces with high-speed and high-density.
Illustrate that the present invention solves other desirable concrete form of described problem.
In other the concrete form of the present invention, other parts are the support units that are used to support optical element.At this moment, can carry out optical element is fixed on the operation on the support units such as retainer reliably, also can well keep the optical characteristics of optical element after being fixed on the support unit.
In other the concrete form of the present invention, other parts are the opticses that reach regulation light function with the optical element concerted action.At this moment, being connected and adjusting simple and reliablely of optical element and other optics can well be maintained fixed the optical characteristics of back optical element and optics.
In the described optical element of concrete form of the present invention, optical element is to assemble the object lens of injecting light beam in order to form point on the record surface of optical recording media.At this moment undertaken by blue coloured light and ultraviolet light when optical recording media reads the assembling of optical take-up apparatus of information and writing information, can improve the object lens transmissison characteristic and reduce the deterioration of imaging characteristic.
In described first fixing means of concrete form of the present invention, use guiding device handling light selectively to the irradiation of bonding position.At this moment, can not have lavishly reliably only to bonding part guidance, can prevent the body part guiding of the processing light that might bring out deterioration in optical properties to optical element handling light.
In other concrete form of the present invention's first fixing means, guiding device is the optical fiber that the processing light from light source is guided to the irradiation position relative with bonding position.At this moment, by simple and lose few optical fiber can be effectively handling light to bonding part guidance.
In other concrete form of the present invention's first fixing means, guiding device is at least one reflection unit that the processing light from light source is guided to the irradiation position relative with bonding position.At this moment, by utilizing the deflection of opticses such as catoptron, can be handling light to bonding part guidance.
In other concrete form of the present invention's first fixing means, use shade to stop processing light to be injected to the optical surface of bonding position periphery.At this moment, can prevent the body part guiding of the processing light that might bring out deterioration in optical properties handling light reliably only to bonding part guidance to optical element.
In other concrete form of the present invention's first fixing means, shade is the mask that covers the optical element optical face.At this moment, utilize simple and reliable mask, can be handling light correctly to bonding part guidance.
In other concrete form of the present invention's first fixing means, shade is the light filter that covers the optical element optical face.At this moment, by having the light filter of multiple function, can be handling light correctly to bonding part guidance.Light filter also can carry out dim light to wavelength as a whole, also can carry out dim light to specific harmful wavelength.
In other concrete form of the present invention's first fixing means, it is in the scope from 380nm to 450nm that optical element uses the use wavelength region may of regulation, handles light solidifying wavelength region may, promptly has luminescence peak in the scope from 280nm to 450nm.At this moment, can effectively reduce following problem, promptly, make optical element the use wavelength region may of regulation promptly the optical characteristics from 380nm to 450nm worsen in fact and think the harmful light that is less than or equal to wavelength 330nm as handling light, effectively reduce making the deterioration of optical element in the optical characteristics such as transmissivity of above-mentioned use wavelength region may by injecting to the optical element body interior.
In other concrete form of the present invention's first fixing means, handle light high-pressure mercury-vapor lamp as light source.At this moment, can be by the processing optical illumination bonding agent of enough brightness.
In other concrete form of the present invention's first fixing means, possessing the optical element of optical element and optics, is any of simple lens and compound lens.At this, said compound lens is meant a plurality of combination of lenses all-in-one-piece lens of the same race or not of the same race.At this moment, when making simple lens and compound lens, by the light-cured type bonding agent can be simple and reliablely connecting between the optical parameter, and the simple lens after well keeping making and the optical characteristics of compound lens.
In described second fixing means of concrete form of the present invention, the regulation that optical element uses is used wavelength region may, be in the scope from 380nm to 450nm, handle light, promptly in the scope from 350nm to 450nm, have luminescence peak guaranteeing to solidify wavelength region may.At this moment, do not use optical element the use wavelength region may of regulation promptly the optical characteristics from 380nm to 450nm worsen in fact and think the harmful light that is less than or equal to wavelength 330nm, and guaranteeing to solidify wavelength region may, promptly the light from 350nm to 450nm uses as handling light, so can effectively reduce the deterioration in the characteristics of using such as optical element transmissivity reduction from 380nm to 450nm.
In other concrete form of the present invention's second fixing means, solid-state light emitting element is any of LED and semiconductor laser.At this moment, the light-emitting component by small-sized and high output can high-level efficiency carry out the photocuring processing.
In other concrete form of the present invention second, third and the 4th fixing means, the optical element that possesses optical element and optics is compound lens, engage any of lens and hybrid lens.At this, compound lens is meant a plurality of combination of lenses all-in-one-piece lens of the same race or not of the same race, the joint lens are meant a plurality of lens are engaged the all-in-one-piece lens with optical surface that hybrid lens is meant the different combination of lenses all-in-one-piece lens not of the same race of the such material of plastic and glass.At this moment, make compound lens, when engaging lens and hybrid lens, by the light-cured type bonding agent can be simple and reliablely connecting between the optical parameter, and the optical characteristics of the compound lens after well keeping making, joint lens and hybrid lens.
In described third and fourth fixing means of concrete form of the present invention, the regulation that optical element uses is used wavelength region may, be in the scope from 380nm to 450nm, light promptly has first luminescence peak in first wavelength region may in the scope from 350nm to 450nm, in second wavelength region may, the relative intensity that promptly has relative first luminescence peak in the scope from 280nm to 330nm is less than or equal to 30% second luminescence peak.At this, it is single that second luminescence peak is not limited to, and it also can be a plurality of sometimes, and promptly certain second above luminescence peak has under a plurality of situations, and all a plurality of second luminescence peaks become relative intensity and are less than or equal to 30%.At this moment thinking that harmful second wavelength region may is promptly in the scope from 280nm to 330nm, owing to reduced optical element used wavelength region may in regulation, the relative intensity of second luminescence peak that i.e. deterioration from 380nm to the 450nm optical characteristics reduces in fact, so, can effectively reduce and use wavelength region may, promptly from 380nm to 450nm in the characteristic degradation of plastics system optical element transmissivity reduction etc.
In other concrete form of the present invention's third and fourth fixing means, light makes the light source light that penetrates from illuminator decay in second wavelength region may.At this moment, can select the bright line spectrum that needs and the light-cured type bonding agent is solidified effectively from illuminator kind with various bright line spectrums.
In other concrete form of the present invention's third and fourth fixing means, light is by having the light filter of attenuation characteristic and at least one of catoptron obtains from the light source light of illuminator in second wavelength region may.At this moment, can decay simply as second wavelength region may of target by light filter and catoptron.
Description of drawings
Fig. 1 (a) is the planimetric map of the first embodiment lens unit, and Fig. 1 (b) is the sectional side view of lens unit;
Fig. 2 is mounted in the sectional side view of the complex objective lens on Fig. 1 lens unit;
Fig. 3 (a) is that expression is used for the adhesive supplying device of UV curing type bonding agent to the fixed position supply, and Fig. 3 (b) is that expression is used for UV is solidified the UV treating apparatus of light to the irradiation of UV curing type bonding agent;
Fig. 4 amplifies the photohead on the UV treating apparatus that is arranged on Fig. 3 (b) in the figure that represents in detail;
Fig. 5 is the following figure of Fig. 4 photohead;
Fig. 6 (a), Fig. 6 (b) are the following figure and the side views of photohead variation shown in presentation graphs 5 etc.;
Fig. 7 is the skeleton diagram of UV treating apparatus variation shown in the presentation graphs 3 (b);
Fig. 8 is that conceptual illustration is used for UV is solidified the figure of light to the UV treating apparatus of UV curing type bonding agent irradiation;
Fig. 9 is that conceptual illustration is used for UV is solidified the figure of light to the UV treating apparatus of UV curing type bonding agent irradiation;
Figure 10 is the curve map of the high-pressure mercury-vapor lamp spectral characteristic of explanation comparative example;
Figure 11 is that explanation makes the curve map from light source light spectral characteristic after optically focused is suitably decayed with concave mirror of high-pressure mercury-vapor lamp;
Figure 12 is the curve map of the LED spectral characteristic of explanation UV treating apparatus shown in Figure 8;
Figure 13 is that explanation makes the curve map from light source light state after optically focused is suitably decayed with concave mirror of high-pressure mercury-vapor lamp;
Figure 14 is the figure that the transmissivity deterioration that has caused by having used UV to solidify the curing processing of light is described;
Figure 15 is the figure that the optical take-up apparatus structure of object lens shown in Fig. 1 grade has been assembled in expression;
Figure 16 is the sectional side view of the expression second embodiment object lens;
Figure 17 is the sectional side view of expression the 3rd embodiment object lens;
Figure 18 is the sectional side view of expression the 4th embodiment object lens.
Embodiment
Further specify in order to solve other desirable embodiment of described problem.
[first embodiment]
The below optical element of explanation first embodiment of the invention, the i.e. object lens used of optical take-up apparatus.
Fig. 1 (a) is the planimetric map of object lens 10, and Fig. 1 (b) is the A-A sectional view of object lens 10.This object lens 10 possesses: complex objective lens 20, and it will relative configuration with optical recording media (not shown) as optical element; Coil rack 40, it supports this complex objective lens 20 as support unit, and makes it to focusing direction BC and tracking direction DE displacement.This object lens 10, at least (for example using wavelength region may is to use in 380～450nm) the optical take-up apparatus utilizing blue coloured light or ultraviolet light, and for using red light (for example using wavelength region may is that 600～700nm) DVD use laser beam and use near infrared that (for example using wavelength region may is that 750～850nm) CD usefulness laser beam is shared.As described later, complex objective lens 20 utilizes UV curing type bonding agent that a pair of lens are connected.
At this, complex objective lens 20 is installed in the mode that embedding is arranged on the peristome 41a of the lens support 41 on the coil rack 40.Be that complex objective lens 20 is a plurality of fixed parts 31 by the adhering device that is made of UV curing type bonding agent, for example by being fixed reliably everywhere not break away from every side with lens support 41.For these fixed parts 31 are solidified, the UV curing type bonding agent irradiation UV light of the liquid shape that the subtend junction surface is supplied with makes on this UV curing type bonding agent and plays photopolymerization reaction.At this moment, by first fixing means, not, but only solidify light to fixed part 31 irradiation UV to complex objective lens 20 integral body.Promptly, solidify the light time to complex objective lens 20 WBR UV, then solidify other deterioration in optical properties such as transmissivity that light wavelength might make complex objective lens 20 body parts, but only solidify light, then reduce the characteristic degradation of complex objective lens 20 to fixed part 31 irradiation UV by method described later by UV.And from second to the 4th fixing means is in order to simplify manufacturing process, and not only to fixed part 31, and to handle light to complex objective lens 20 WBRs be that UV solidifies light.Consequently might produce and solidify light wavelength by UV to make the body part of complex objective lens 20 be the deterioration in optical properties problem of complex objective lens 20 of the transmissivity reduction etc. of optical element, its solution aftermentioned.
Coil rack 40 has the coil rack body 43 that extends from the lens support 41 of supporting complex objective lens 20, and this coil rack body 43 possesses: focusing coil 43a, and it makes complex objective lens 20 to the driving force along the focusing direction BC displacement of optical axis OA; Tracking coil 43b, it makes the driving force of complex objective lens 20 to the tracking direction DE displacement vertical with optical axis OA.In open space AS, be inserted with and constitute focusing and follow the tracks of the yoke (not shown) of using magnetic loop.
Fig. 2 is the sectional side view of complex objective lens 20.This complex objective lens 20 is optically focused a lenticular unit 21 with proofreading and correct the optics that wave aberration uses with optical element for example is that phase place optical element parts 22 are connected.The former lenticular unit 21, be that integrally formed plastic part (for example can be with formation such as propylene system and cyclic olefine polymkeric substance, just be to use PMMA, PC etc. specifically), it possesses: circular lens section 24 and the annular flange portion 25 that forms around this lens section 24.Latter's phase place optical element parts 22 also are integrally formed plastic parts, and it possesses: circular phase element portion 27 and the annular flange portion 28 that forms around this phase element portion 27.The flange part 25 of lenticular unit 21 and the flange part 28 of phase place optical element parts 22, by the adhering device that constitutes by UV curing type bonding agent, everywhere the curing of fixed part 33 (only having represented two places) promptly, the composition surface of two flange parts 25,28 interconnects, and the assembling of complex objective lens 20 is over.The material of fixed part 33 can be for example to add the thing that photopolymerization begins agent on ultraviolet hardening monomers such as acryloyl group, methacryl.
In lenticular unit 21, lens section 24 for example is to be designed to the wave aberration minimum in Blu-ray system, is exactly at the record surface optically focused in Blu-ray usefulness dish under the numerical aperture NA0.85 specifically the light source light of wavelength 408nm.And flange part 25 has the ring-shaped protrusion 25a to phase place optical element parts 22 lateral processes, is formed with the circular step 25b that reduces toward the outer side at its front end.This step 25b is for 21 pairs of phase place optical elements of lenticular unit parts 22 being carried out the adjustment of optical axis OA direction and carrying out using with the adjustment of optical axis OA vertical direction.
In phase place optical element parts 22, wave front for example takes place at the wavelength of Blu-ray system and changes in phase element portion 27 hardly, and in the wavelength calibration wave aberration of DVD system.The complex objective lens 20 that promptly has described lenticular unit 21 and these phase place optical element parts 22 is designed to not only in Blu-ray system, and is also wave aberration minimum at DVD.Be exactly specifically, the light source light of wavelength 408nm under the numerical aperture NA0.85 when Blu-ray is with the record surface optically focused in the dish, also the light source light of the wavelength 650nm that DVD is used under the numerical aperture NA0.65 to DVD with the record surface optically focused in the dish.Flange part 28 has the ring-shaped protrusion 28a to lenticular unit 21 lateral processes, is formed with to the inside seamed edge 28b at its front end.This seamed edge 28b by with the step 25b concerted action that is arranged on the lenticular unit 21, and be used in the adjustment of lenticular unit 21 and phase place optical element parts 22.Like this, controlled two parts 21,22, by a plurality of fixed parts of constituting by above-mentioned UV curing type bonding agent 33 just do not break away from mutually by secure fixation.For fixed part 33 is solidified rapidly in the moment of making line, the UV curing type bonding agent that shines on the junction surface of adjusting state solidifies light with appropriate time and intensity irradiation UV, makes on this UV curing type bonding agent and plays photopolymerization reaction.At this moment, from second to the 4th fixing means is in order to simplify manufacturing process, not only to fixed part 33, and solidifies light to complex objective lens 20 WBR UV.
＜bonding agent is supplied with operation 〉
Fig. 3 (a) is the concept map that is used for adhesive supplying device that UV curing type bonding agent is supplied with to the fixed position of complex objective lens 20, and to be conceptual illustration solidify the figure of the UV treating apparatus that light uses to UV curing type bonding agent irradiation UV to Fig. 3 (b).
Among Fig. 3 (a), adhesive supplying device possesses: bonding agent device for discharging fixed 51, and it keeps UV curing type bonding agent and at reasonable time it is sent; Movable nozzle 52, it makes from the predetermined bonding position of UV curing type bonding agent attached to complex objective lens 20 and coil rack 40 that the bonding agent device for discharging fixed is sent.By this adhesive supplying device, the UV curing type bonding agent that become fixed part 31 adjusted on coil rack 40 complex objective lens 20 placed around supply with coating everywhere.
＜bonding agent curing process 〉
Describe the bonding agent curing process of the present invention's first fixing means below in detail.
Among Fig. 3 (b), the UV treating apparatus possesses: high-pressure mercury-vapor lamp 54, and it is a light emitting source; Concave mirror 55, its light source light from high-pressure mercury-vapor lamp 54 forwards reflects; Lens 56, the UV that its high-pressure mercury-vapor lamp 54 forwards penetrates solidifies light and carries out optically focused; Light guide member 57, it is made of fiber etc., is used to guide the UV by lens 56 optically focused to solidify light; Photohead 58, it is arranged on the front of light guide member 57, and makes UV solidify the specified distribution ejaculation of light with corresponding fixed part 31; Drive unit 59, it makes photohead 58 move to suitable position.Carrying out UV when solidifying, by making drive unit 59 actions photohead 58 is moved to suitable position, make the complex objective lens 20 relative contacts of placement on its lower end and the coil rack 40.Then, the light source light from high-pressure mercury-vapor lamp 54 is guided to light guide member 57, like this, just can penetrate the UV that wish figure and solidify light, only solidify light, it was just solidified in the short time to fixed part 31 irradiation UV from the lower end of photohead 58.
Fig. 4 carries out illustrative enlarged drawing to the concrete structure of photohead 58 shown in Fig. 3 (b), and Fig. 5 is the figure of explanation from beneath photohead 58 states.Photohead 58 has: spindle unit 58a, and it is driven by the drive unit shown in Fig. 3 (b) 59 can carry out three-dimensional displacement; Four fiber 58b of branch, its be fixed on spindle unit 58a around and penetrate UV from the lower end and solidify light.Central authorities are formed with recess 58d in the lower surface of spindle unit 58a, and it makes spindle unit 58a not damage the optical surface of lenticular unit 21 grades when contacting with complex objective lens 20.Four fiber 58b of branch, its front with uniformly-spaced be fixed on spindle unit 58a around, its root accumulates one and be connected with light guide member 57.Promptly solidify light and carried out branch, and to the bonding position relative with their lower ends (irradiation position), promptly fixed part 31 is injected to four fiber 58b of branch to the UV of light guide member 57 guiding.Number and the configuration of the fiber 58b of branch are certainly according to the number of fixed part 31 and configuration and suitably change.
Fig. 6 (a) is the outboard profile of explanation photohead 58 variation shown in Figure 4, and Fig. 6 (b) schemes below it.The situation of this photohead 158 is that spindle unit 158a self has optical fiber and guided wave bar, and the upper end of spindle unit 158a is connected with light guide member 57.Be formed with circular mask 158f in the lower surface of spindle unit 158a central authorities, it makes spindle unit 158a make UV solidify light with complex objective lens 20 approaching configurations the time and does not inject to lenticular unit 21 grades.This mask 158f both can be light absorbing ND light filter, also can be catoptron, and can be the Hi-pass filter that only interdicts harmful ultraviolet light.
Fig. 7 is the figure of explanation UV treating apparatus bulk deformation example shown in Figure 3.At this moment UV treating apparatus possesses: ultraviolet laser 254, and it is a light emitting source; Lens 256, its light source light from ultraviolet laser 254 is solidified light as UV and is carried out suitable convergence; Gearing 258, it makes the high speed displacement of lens 256 at the direction enterprising parallel planes vertical with optical axis; Drive unit 259, it makes gearing 258 regulate the ejaculation angle that UV solidifies light in the reasonable time action.Output by suitable adjusting drive unit 259 is suitably moved gearing 258, then lens 256 move to the desired location vertical with optical axis, the UV curing light from ultraviolet laser 254 through lens 256 is only injected to fixed part 31 with dotted state, and it is solidified at short notice.Replace lens 256 and gearing 258 and use catoptron and drive unit thereof, the luminous point that UV curing light is used moves to the optional position.
Solidify light wavelength at this UV that UV treating apparatus use once is described.Output UV solidifies the high-pressure mercury-vapor lamp 54 and the ultraviolet laser 254 of light, the material that need make fixed part 31,33 is that UV curing type bonding agent solidifies rapidly, at this moment if from their light to complex objective lens 20 WBRs, then might make complex objective lens 20 use the optical characteristics of wavelength region may to be worsened in fact comprising 408nm.And consider in solidifying wavelength region may 280nm～450nm, the UV of the harmful wavelength region may 280nm～330nm of short wavelength side solidifies light, make complex objective lens 20 using wavelength region may optical characteristics of (concrete example is 408nm) from 380nm to 450nm to worsen in fact, be harmful to.It is present embodiment, UV curing type bonding agent is cured effectively, though be that the high-pressure mercury-vapor lamp 54 and the ultraviolet laser 254 of the luminescence peak with deterioration in optical properties of using wavelength region may are used as light source, but owing to be harmful UV to be solidified light only nearby inject selectively to the fixed part 31,33 and the utmost point thereof, so when can reduce the deterioration in optical properties in 20 assembling stages of complex objective lens, it is assembled on the coil rack 40 reliably.
Figure 10 is the curve map of explanation high-pressure mercury-vapor lamp spectral characteristic.Transverse axis is represented wavelength among the figure, and the longitudinal axis is represented relative exposure (%).The wavelength 368nm position of this high-pressure mercury-vapor lamp in first wavelength region may (guarantee solidify wavelength region may) 350nm～450nm has the first luminescence peak P1, thinking that the wavelength 315nm position among harmful second wavelength region may (harmful wavelength region may) 280nm～330nm has the second luminescence peak P2.Be present in the first luminescence peak P1 among first wavelength region may (guaranteeing to solidify wavelength region may) 350nm～450nm, think that it is effective that UV is solidified.And second wavelength region may (harmful wavelength region may) 280nm～330nm, perhaps it is effective UV being solidified, but when lenticular unit 21 that constitutes complex objective lens 20 and 22 irradiations of phase place optical element parts, the lens section 24 of these parts 21,22 and the blue coloured light of phase element portion 27 and the transmissison characteristic of ultraviolet light are significantly worsened.Particularly be present in second luminescence peak at wavelength 315nm place of second wavelength region may 280nm～330nm and the luminescence peak of periphery thereof, think to make the reason of deterioration in optical properties of the use wavelength 408nm etc. of lens section 24.
Figure 11 be explanation from the light source light of high-pressure mercury-vapor lamp with characteristic shown in Figure 10 when carrying out optically focused, use concave mirror the curve map of its back state of suitably decaying with wavelength characteristic.Can recognize that from curve map through behind the concave mirror, the UV that penetrates from the UV treating apparatus solidifies the light source light that light comprises harmful wavelength region may 280nm～330nm more, the relative exposure of the second luminescence peak P2 is not decay almost.When using the high-pressure mercury-vapor lamp of assembling concave mirror, by lenticular unit 21 grades are equivalent to about 500mJ/cm 2About 20 seconds directly the exposure, the transmissivity of lenticular unit 21 grades is reduced to about about 91.3% from about 94%.By being equivalent to about 9700mJ/cm 2400 seconds exposure, the transmissivity of lenticular unit 21 grades is reduced to about 90.0% from about 94%.
Promptly recognize from the light source light of high-pressure mercury-vapor lamp intactly when complex objective lens 20 is injected, then the transmissivity of lenticular unit 21 grades has suitable minimizing.
More than be that high-pressure mercury-vapor lamp is solidified the situation that light uses as UV, but when ultraviolet laser 254 solidified the light use as UV, think that the setting by luminescence peak also produces same phenomenon.Promptly think: harmful wavelength region may 280nm～330nm, perhaps it is effective UV being solidified, but when the lenticular unit 21 that constitutes complex objective lens 20 and phase place optical element parts 22 intactly shine, the lens section 24 of these parts 21,22 and the blue coloured light of phase element portion 27 and the transmissison characteristic of ultraviolet light are significantly worsened.
According to above prerequisite, be to use as light source and comprise the harmful wavelength region may 280nm～330nm's that can seek the UV curing efficiencyization, but use photohead 58 shown in Fig. 3 (b) and photohead 158 shown in Figure 6 etc., and the position of injecting that UV solidifies light is limited near the fixed part 31,33 and the utmost point thereof.Like this, when can reduce the deterioration in optical properties in 20 assembling stages of complex objective lens, it is assembled on the coil rack 40 reliably.
Describe the bonding agent curing process of the present invention's second fixing means below in detail.
Fig. 8 is that conceptual illustration is used for UV is solidified the figure of light to the UV treating apparatus of UV curing type bonding agent irradiation usefulness.This UV treating apparatus possesses: a plurality of LED151, and it is a light emitting source; A plurality of lenslets 152, its light source light from each LED151 collimates; Collector lens 154, its UV that has passed through these lenslets 152 solidifies light and carries out optically focused; Light guide member 155, it is made of fiber etc., is used for that the UV by collector lens 154 optically focused is solidified light and guides to object.At the relative position place of light guide member 155 ejecting ends, complex objective lens 20 is arranged to be placed on the state configuration on the coil rack 40, the fixed part 31 that the appropriate location between complex objective lens 20 and lens support 41 is supplied with is solidified rayed and short time curing by UV.When UV curing light being wished that the point of size is formed on the desired location, then do not need light guide member 155 by collector lens 154 grades.
To this, illustrate that the UV of second fixing means solidifies light wavelength.
Output UV solidifies the LED151 of light, though making the material of fixed part 31,33 is that UV curing type bonding agent solidifies, but it solidifies among wavelength region may 350nm～450nm in the assurance that the deterioration in optical properties that makes complex objective lens 20 comprise 408nm use wavelength region may reduces in fact, has single luminescence peak.The UV curing light that is in a ratio of the harmful wavelength region may 280nm～330nm of short wavelength side with assurance curing wavelength region may 350nm～450nm is considered to make complex objective lens 20 to worsen in fact in the optical characteristics that comprises 408nm use wavelength region may, is harmful to.It is present embodiment, UV curing type bonding agent is cured effectively, and handle uses as illuminating source at the LED151 that the wavelength location place that can keep use wavelength region may optical characteristics has luminescence peak, so when can reduce complex objective lens 20 assembling stage optical characteristic degradations, it is assembled on the coil rack 40 reliably.
Figure 12 is the curve map of explanation LED151 spectral characteristic.Transverse axis is represented wavelength in the curve map, and the longitudinal axis is represented relative exposure (%).LED151 is guaranteeing that the wavelength 380nm position of solidifying among wavelength region may 350nm～450nm has single luminescence peak, and is then not luminous fully at the harmful wavelength region may 280nm～330nm and the long wavelength side of short wavelength side.Like this, LED151 just can be set in the luminous zone zone in the very narrow scope, and emission wavelength also can freely be set in the scope of certain degree, so its present embodiment UV that is set with strict demand that is applicable to emission wavelength solidifies purposes.LED151 can be only luminous in the narrow band territory as purpose, so do not need to use light filter etc., can improve the utilization ratio of light.Replace LED151, also can use LD (semiconductor laser).At this moment, can solidify light to the UV that has improved directivity and carry out treatment with irradiation to fixed part 31,33.
At first narrate when high-pressure mercury-vapor lamp being solidified the light use as UV, particularly be present in second luminescence peak among the wavelength 315nm of second wavelength region may 280nm～330nm and the luminescence peak of periphery thereof, the reason of the deterioration in optical properties that use wavelength 408nm that is considered to make lens section 24 etc. locates, in embodiment described later, relate to this identification, but when LED151 is solidified light and uses as UV, think that the setting by luminescence peak also produces same phenomenon.Promptly think: harmful wavelength region may 280nm～330nm, perhaps it is effective UV being solidified, but when lenticular unit 21 that constitutes complex objective lens 20 and 22 irradiations of phase place optical element parts, the lens section 24 of these parts 21,22 and the blue coloured light of phase element portion 27 and the transmissison characteristic of ultraviolet light are significantly worsened.On the other hand, guarantee to solidify wavelength region may 350nm～450nm, it is effective not only UV being solidified, even it when lenticular unit 21 that constitutes complex objective lens 20 and 22 irradiations of phase place optical element parts, it also makes the lens section 24 of these parts 21,22 and the blue coloured light of phase element portion 27 and the transmissison characteristic of ultraviolet light worsen hardly, maybe can reduce deterioration degree.According to above such prerequisite, then selected LED151 as guaranteeing to solidify the light source of wavelength region may 350nm～450nm.Now, it has LED151 the various characteristics of luminescences and has the goods of enough brightness selling in Lan Se and ultraviolet, its be can be only in guaranteeing to solidify the scope in this narrow band territory of wavelength region may 350nm～450nm reliable luminous, good solid-state light emitting element.
Describe the bonding agent curing process of the present invention's third and fourth fixing means below in detail.
Fig. 9 is that conceptual illustration is used for UV is solidified the figure of light to the UV treating apparatus of UV curing type bonding agent irradiation.This UV treating apparatus possesses: high-pressure mercury-vapor lamp 351, and it is a light emitting source; Concave mirror 352, its light source light from high-pressure mercury-vapor lamp 351 forwards reflects; Cut-off filter 353, harmful ultraviolet light that its UV that forwards penetrates from high-pressure mercury-vapor lamp 351 solidifies the short wavelength side the light is removed; Lens 354, its UV that has passed through cut-off filter 353 solidifies light and carries out optically focused; Light guide member 355, it is made of fiber etc., is used for that the UV by lens 354 optically focused is solidified light and guides to object.At the relative position of light guide member 355 ejecting ends, complex objective lens 20 is arranged to be placed on the state configuration on the coil rack 40, the fixed part 31 that the appropriate location between complex objective lens 20 and lens support 41 is supplied with is solidified rayed and just curing of short time by UV.And when scioptics 354 wish that the point of size is formed on desired location to UV curing light, then do not need light guide member 355.
The following describes the third and fourth fixing means UV and solidify light wavelength.
To the explanation of Figure 10 high-pressure mercury-vapor lamp spectral characteristic as previously mentioned, particularly be present in second luminescence peak among the wavelength 315nm of second wavelength region may 280nm～330nm and the luminescence peak of periphery thereof, be considered to make the reason of the deterioration in optical properties that the use wavelength 408nm etc. of lens section 24 locates.Present embodiment is removed the second luminescence peak P2 of the wavelength 315nm that particularly decayed to the harmful ultraviolet light of second wavelength region may 280nm～330nm from the light source light of high-pressure mercury-vapor lamp 351.Be exactly that the relative intensity of the second luminescence peak P2 of second wavelength region may 280nm～330nm to the first luminescence peak P1 of first wavelength region may 350nm～450nm, setting for for example is to be less than or equal to 30% specifically.
Figure 13 be explanation from the light source light of high-pressure mercury-vapor lamp 351 in optically focused, with suitably the decay curve map of back state of the concave mirror 352 with wavelength characteristic.In the curve map, the relative exposure the when relative exposure when solid line is represented to use first kind concave mirror, dotted line are represented to use the second type concave mirror.Recognize also that from curve map when using the concave mirror of second type, the UV that penetrates from the UV treating apparatus solidifies light, comprises the light source light of second wavelength region may 280nm～330nm more, the relative exposure of the second luminescence peak P2 is not decay almost.And when using the concave mirror of the first kind, the UV that penetrates from the UV treating apparatus solidifies light, comprises the light source light of second wavelength region may 280nm～330nm hardly, and the relative exposure of the second luminescence peak P2 is less than 20%.Even and recognize any of concave mirror of the concave mirror that uses the first kind and second type, the absolute strength of the first luminescence peak P1 does not all have big difference.Recognize according to this, use the concave mirror of the first kind of representing with solid line, only make the second luminescence peak P2 decay of high-pressure mercury-vapor lamp 351, it is effective to the characteristic degradation that reduces complex objective lens 20.That is, have solid line by use and represent that the UV of luminescence distribution solidifies light, even the UV that solidifies usefulness is solidified light to lenticular unit 21 and phase place optical element parts 22 WBRs, the transmissivity that also can reduce these parts 21,22 worsens.
Below table 1 represented to constitute the embodiment of fixing means between the optical elements such as lens (being exactly parts 21,22 specifically) of complex objective lens 20 shown in Figure 2.
[table 1]
Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4
Set time 5 seconds 6 seconds 8 seconds 10 seconds
Irradiation energy 4500mJ/cm 2 5400mJ/ cm 2 7200mJ/ cm 2 9000mJ/ cm 2
Transmissivity 93.4％ 93.3％ 93.3％ 93.3％
In the table 1, be that expression uses the UV of the characteristics of luminescence shown in the solid line in the curve map of Figure 13 to solidify the curing processing time of light time set time, and irradiation energy is the luminous energy that expression is cured the job position of processing, and transmissivity is the transmissivity at wavelength 408nm.Because being cured the transmissivity of handling front lens parts 21 grades is 94%, so think that the transmissivity of expression is only having worsened than 94% part of lacking in the table.Also clearly recognize 5～10 seconds the curing processing time that the present embodiment UV that decays by the second luminescence peak P2 that makes wavelength 315nm solidifies light, the reduction that does not almost produce optical element transmissivities such as lens from table 1.
Following table 2 has been represented the comparative example of fixing means between the optical element.
[table 2]
Comparative example 1 Comparative example 2 Comparative example 3
Set time 3 seconds 5 seconds 10 seconds
Irradiation energy 430mJ/cm 2 655mJ/cm 2 1072mJ/cm 2
Transmissivity 91.8％ 91.2％ 90.9％
At this moment, replace representing that with solid line the UV of the characteristics of luminescence solidifies light in Figure 13 curve map, and use the UV of the characteristics of luminescence shown in Figure 10 curve map to solidify light.Also clearly recognize from table 2, do not make second luminescence peak P2 when decay, even UV solidifies the curing processing time of light about 12 seconds (be the equal of do not carry out concave mirror optically focused situation less than 1 second), optical element transmissivities such as lens also significantly reduce.
Figure 14 is the figure that the transmissivity deterioration that has caused by having used UV to solidify the curing processing of light is described.Solid line among the figure represents that UV solidifies the distribution of handling optical element transmissivities such as front lens, and dotted line is corresponding to the comparative example 3 of table 2.Recognize that promptly transmissivity significantly reduces when using exposed high-pressure mercury-vapor lamp in solidifying processing.Dot-and-dash line among the figure is recognized by using in Figure 13 curve map and is represented that with solid line the UV of the characteristics of luminescence solidifies light, can quite suppress the reduction of transmissivity corresponding to the embodiment of table 1.
The light source that solidifies light as UV has been to use high-pressure mercury-vapor lamp in the above description, but replaces high-pressure mercury-vapor lamp also can use halogen lamp etc. to have the lamp of the various characteristics of luminescences.At this moment, also be in curing, to utilize first wavelength region may 350nm～450nm, the deterioration by second wavelength region may 280nm～330nm reduces optical characteristics makes the luminescence peak decay of this second wavelength region may 280nm～330nm.
Expressed following content in the above description clearly, illustrated that using wavelength region may is the situation of 408nm, but to the complex objective lens 20 that uses in other wavelength in wavelength 380nm～450nm scope, inject position (first fixing means) by what control UV solidified light, even other wavelength is not observed special transmissivity reduction (second fixing means) yet in the scope of wavelength 380nm～450nm in addition, that understands from the curve map of Figure 14 in addition is such, even the transmissivity of embodiment also has raising the (the 3rd than comparative example in the scope of wavelength 380nm～450nm, the 4th fixing means), also can high precision carrying out optical information reads with optical information and writes.
More than illustrated complex objective lens 20 is bonded in method on the coil rack 40, but engage lenticular unit 21 and phase place optical element parts 22 and the method and apparatus of finishing complex objective lens 20 also with above-mentioned be same.
Figure 15 is the figure that the optical take-up apparatus structure on the shaven head represented object lens 10 shown in Fig. 1 etc. is assembled in summary.
This optical take-up apparatus has: semiconductor laser 62, and it penetrates the light beam (being exactly wavelength 408nm specifically) that first CD, 61 information regenerations are used; Semiconductor laser 66, it penetrates the light beam (being exactly wavelength 650nm specifically) that second CD, 65 information regenerations are used, and, can penetrate wavelength different laser mutually that is.From the laser of two semiconductor lasers 62,66, utilize the object lens 10 (being exactly complex objective lens 20 specifically) be assembled in the shaven head 100 and to CD 61,65 irradiations, utilize object lens 10 etc. to carry out optically focused from the reflected light of CD 61,65.
When at first first CD 61 being reproduced, from first semiconductor laser, 62 outgoing beams, the light beam transmitted light beam separation vessel 71 of ejaculation, and transmission-polarizing light beam splitter 72, collimating apparatus 73 and 1/4 wavelength plate 74 and become circularly polarized parallel beam.This light beam is reduced by aperture 76, by complex objective lens 20 by the transparency carrier 61a of first CD 61 optically focused on information recording surface 61b.
Information recording surface 61b by modulated with information bits beam reflected transmission complex objective lens 20, aperture 76,1/4 wavelength plate 74 and collimating apparatus 73 and inject polarization beam splitter 72, and be reflected and scioptics 78 and cylindrical lens 78b and be given astigmatism at this, on photodetector 79, inject, use this output signal can obtain being recorded in the signal that reads of information on first CD 61.
Detect on the photodetector 79 light flux variations that causes by the metamorphosis of point, change in location to close Jiao's (focusing) detection and tracking detection.According to this detection, be assembled in the plane gearing 81 in the shaven head 100, object lens 10 is being moved on the optical axis direction so that from light beam imaging on the information recording surface 61b of first CD 61 of first semiconductor laser 62, simultaneously, it is moving so that imaging on the track of stipulating from the light beam of this semiconductor laser 62 object lens 10 on direction vertical with optical axis.
On the other hand, when second CD 65 is reproduced, from second semiconductor laser, 66 outgoing beams, the light beam that penetrates is that transmitted light beam separation vessel 71 is reflected at the light compositing device, and with same from the light beam of described first semiconductor laser 62, transmission-polarizing light beam splitter 72, collimating apparatus 73,1/4 wavelength plate 74, aperture 76 and complex objective lens 20, optically focused is on information recording surface 65b by the transparency carrier 65a of second CD 65.
Information recording surface 65b by modulated with information bits beam reflected, once more by complex objective lens 20, aperture 76,1/4 wavelength plate 74, collimating apparatus 73, polarization beam splitter 72, lens 78 and cylindrical lens 78b, on photodetector 79, inject, use this output signal can obtain being recorded in the signal that reads of information on second CD 65.
Identical with the situation of first CD 61, detecting on the photodetector 79 light flux variations that is caused by the metamorphosis of point, change in location detects to close burnt detection and tracking, by being assembled in the plane gearing 81 of shaven head in 100, make object lens 10 in order to focus and to follow the tracks of and move.
In the optical take-up apparatus of above explanation, assembled the fixing object lens 10 of method of explanations such as utilizing Fig. 3, Fig. 8, Fig. 9, install and fix the few complex objective lens 20 of middle transmissison characteristic deterioration owing to having assembled in this object lens 10, so can carry out reading of information and record with high precision.
The fixing of optical element in the object lens 10 more than has been described, but for other optical element, for example collimating apparatus 73, polarization beam splitter 72, cylindrical lens 78b etc. by adopting same fixing means, also can reduce the deterioration of transmissison characteristic.
[second embodiment]
The following describes the optical element of second embodiment.First embodiment has assembled complex objective lens 20 in object lens 10, and the situation of second embodiment is intactly as object lens plastic simple lens.
Figure 16 is the sectional side view of the expression second embodiment object lens 110.Second embodiment is the variation of first embodiment, pays identical symbol and omit repeat specification on same section.The structure of this object lens 110 is: at optical element is on the coil rack 40, fixedly has signal-lens object lens 120 as optical element.At this moment, also be to use photohead 58 shown in Fig. 3 (b) etc. etc., owing to for example only solidify light (first fixing means) to the 31 irradiation UV of fixed part everywhere, or use the UV treating apparatus shown in Fig. 8, Fig. 9 etc. and can solidify light (from second to the 4th fixing means) to the UV that harmful ultraviolet ray has been removed in fixed part 31 and periphery irradiation thereof, so when can reduce lens section 24 deterioration in optical properties, fixed part 31 is solidified.
Having used the optical take-up apparatus of object lens 110 shown in Figure 16, is identical structure with Figure 15 basically.But when lens section 24 has diffraction structure etc. rather than the situation corresponding with dual wavelength, then do not need the semiconductor laser 66 of second CD, 65 usefulness and beam splitter 71 etc.
[the 3rd embodiment]
The following describes the optical element object lens of the 3rd embodiment.As shown in figure 17, these object lens 220 are the joint lens of using the adhesive linkage 233 that is made of UV curing type bonding agent to engage between the optical surface of a pair of different plastic lens 221,222.At this, two plastic lenss 221,222, for example its refractive index difference.
At this moment, also be a pair of plastic lens 221,222 that the centre is accompanied its uncured state adhesive linkage 233, by undertaken UV to solidify processing by Fig. 8, UV treating apparatus shown in Figure 9 adhesive linkage 233 is solidified rapidly, the transmissison characteristic that can reduce object lens 220 worsens.
Also be that for example the use wavelength region may of utilizing in reading and write in information to be set at be 380nm～450nm in the 3rd embodiment.At this moment, also be in the curing of adhesive linkage 233, to utilize to guarantee to solidify wavelength region may (first wavelength region may) 350nm～450nm, and the deterioration in optical properties of the object lens 220 that harmful wavelength region may (second wavelength region may) 280nm～330nm of minimizing causes.The luminescence peak of this second wavelength region may 280nm～330nm, relative first wavelength region may decays to and for example is less than or equal to 30% relative intensity in the 3rd, the 4th fixing means.
[the 4th embodiment]
The following describes the optical element object lens of the 4th embodiment.As shown in figure 18, these object lens 320 are the hybrid lens that utilizes adhesive linkage 333 joints that are made of UV curing type bonding agent between the optical surface of glass lens 321 and plastic lens 322.At this, plastic lens 322 for example is a non-spherical lens.
At this moment, also be a pair of lens 321,322 that the centre accompanied its uncured state adhesive linkage 333, by undertaken UV to solidify processing by Fig. 8, UV treating apparatus shown in Figure 9 adhesive linkage 333 is solidified rapidly, the transmissison characteristic that can reduce object lens 320 worsens.
Also be that for example the use wavelength region may of utilizing in reading and write in information to be set at be 380nm～450nm in the 4th embodiment.At this moment, also be in the curing of adhesive linkage 333, to utilize to guarantee to solidify wavelength region may (first wavelength region may) 350nm～450nm, and the deterioration in optical properties of the object lens 320 that harmful wavelength region may (second wavelength region may) 280nm～330nm of minimizing causes.The luminescence peak of this second wavelength region may 280nm～330nm, relative first wavelength region may decays to and for example is less than or equal to 30% relative intensity in the 3rd, the 4th fixing means.
By above embodiment the present invention has been described, but the present invention is not limited to described embodiment.For example be to use ultraviolet light to carry out photocuring in the above-described embodiments, but also can use the fixed part that constitutes by the light-cured type bonding agent that is cured by visible light.
In described embodiment, be fixed part 31,33 to be cured in an operation, but also can be divided into a plurality of operations and make fixed part 31,33 photocurings by Fig. 3 (b), Fig. 8, UV treating apparatus shown in Figure 9.In the time of promptly can not fully guaranteeing to solidify the used time owing to make the temporal restriction of line productive temp, carry out earlier temporary fixed (interim solidify) to fixed part 31,33 of just finishing with the short time, it is taken out from making line, give time enough to fixed part 31,33 and carry out to reach really bonding (the really curing) of permanent adhesive intensity in the storages stage of etc.ing.Like this, just can be assembled in Fig. 3, Fig. 8, UV treating apparatus shown in Figure 9 neatly and make in the line with the ground that has no relations set time.
The object lens 10 that optical take-up apparatus is used has been described in the above-described embodiments, even but also can utilize fixing means of the present invention to other part etc.Be that complex objective lens 20 grades are not limited to be coil rack 40, but can utilize UV to solidify and be fixed on various retainers and the part.

Claims (20)

1. fixing means, it utilizes the light-cured type bonding agent that plastics system optical element and other adhering components are fixed, this optical element uses wavelength region may to use being arranged in the regulation that comprises blue coloured light and ultraviolet wavelength scope at least, and this fixing means comprises following operation:
The light-cured type bonding agent is supplied with to the bonding position between described optical element and other parts;
By shining so that the light-cured type bonding agent solidifies to bonding position selectively handling light.
2. fixing means as claimed in claim 1 wherein, utilizes guiding device handling light selectively to the irradiation of bonding position.
3. fixing means as claimed in claim 2, wherein, described guiding device is an optical fiber, described guiding device will be handled light and guide to the irradiation position relative with bonding position from light source.
4. fixing means as claimed in claim 2, wherein, described guiding device is a reflection unit at least, described reflection unit will be handled light and guide to the irradiation position relative with bonding position from light source.
5. fixing means as claimed in claim 1, wherein, described processing light is stoped by shade to be injected to the optical surface of bonding position periphery.
6. fixing means as claimed in claim 5, wherein, described shade is the mask that covers the optical element optical face.
7. fixing means as claimed in claim 5, wherein, described shade is the light filter that covers the optical element optical face.
8. fixing means as claimed in claim 1, wherein, it is in the scope from 380nm to 450nm that the regulation of described optical element is used wavelength region may, the curing wavelength region may of described processing light in the scope from 280nm to 450nm has luminescence peak.
9. fixing means as claimed in claim 8, wherein, described processing light high-pressure mercury-vapor lamp as light source.
10. fixing means as claimed in claim 1, wherein, described other parts are the support units that are used to support described optical element.
11. fixing means as claimed in claim 1, wherein, described other parts are the opticses that reach regulation light function with the optical element concerted action.
12. an optical element, it has optical element and other element, and wherein, described optical element and described other element use the described fixing means of claim 1 to interfix.
13. optical element as claimed in claim 12, wherein, described optical element is object lens, assembles by the incident beam of these object lens, to form a little on the record surface of optical recording media.
14. stationary installation, it utilizes the light-cured type bonding agent that plastic optical element and other adhering components are fixed, this optical element uses wavelength region may to use being arranged in the regulation that comprises blue coloured light and ultraviolet wavelength scope at least, and described stationary installation comprises:
Feedway, the light-cured type bonding agent is supplied with at its bonding position between optical element and other parts;
Light irradiation device, it utilizes handles light selectively to the irradiation of bonding position, to solidify the light-cured type bonding agent.
15. an optical take-up apparatus, it has the described optical element of claim 12, wherein, can read information or writing information from the record surface of optical recording media.
16. fixing means as claimed in claim 1, wherein, this fixing means is used for the optical element of optical take-up apparatus.
17. fixing means as claimed in claim 1, wherein, it utilizes the light-cured type bonding agent that periphery and other adhering components of plastics system optical element are fixed, this optical element has optical surface and centers on the described periphery of this optical element, and use wavelength region may to use being arranged in the regulation that comprises blue coloured light and ultraviolet wavelength scope at least, this fixing means comprises following operation:
The bonding position of light-cured type bonding agent between described periphery and described other parts supplied with;
By controlling the light path of described processing light, utilize described processing light to shine selectively and comprise described bonding position and the zone except that described optical surface, so that the light-cured type bonding agent solidifies.
18. fixing means as claimed in claim 1, wherein, described processing light has the emission light of the specific wavelength of 280nm～330nm scope.
19. fixing means as claimed in claim 18, wherein, described processing light has first intensity in first wavelength region may is 350～450nm scope first luminescence peak,
Wherein, the intensity that has in described particular wavelength region is 280nm～330nm scope of described processing light is greater than 30% of described first intensity.
20. fixing means as claimed in claim 18, wherein, described processing light promptly has luminescence peak in 280～330nm scope in described particular wavelength region.
CNA2008102151975A 2004-05-31 2005-05-27 Fixing method, optical component and pickup manufactured by the fixing method Pending CN101414043A (en)

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