CN1767021A

CN1767021A - Optical pickup apparatus and objective optical element

Info

Publication number: CN1767021A
Application number: CN 200510099982
Authority: CN
Inventors: 木村彻; 新勇一; 池中清乃; 荻原贤治; 野村英司
Original assignee: Konica Minolta Opto Inc
Current assignee: Konica Minolta Opto Inc
Priority date: 2004-09-15
Filing date: 2005-09-12
Publication date: 2006-05-03
Anticipated expiration: 2025-09-12
Also published as: CN1767021B; CN1767020A

Abstract

The invention provides an optical pickup apparatus capable of realizing simplification of its constitution and cost reduction of the apparatus in the optical pickup apparatus on which an objective optical system is mounted, having a phase structure and capable of performing recording and/or reproduction of information suitably to three kinds of disks including a high density optical disk using a blue-purple laser light source, a DVD and a CD and having recording density different from each other and to provide an objective optical element. When refractive index change caused by temperature change is generated in the objective optical element OL in which a first light flux for the BD or a second light flux for the DVD is made incident, generated spherical aberration can be compensated by moving a lens L1 of a beam expander EXP to be a temperature compensation element to an optical axis direction by an actuator AC2 according to the refractive index change.

Description

Optical take-up apparatus reaches the thing optical element

Technical field

The present invention relates to a kind of can to different types of optical information recording media carry out interchangeably recording of information and/or reproduction optical take-up apparatus and to the thing optical element.

Background technology

In recent years, with regard to optical take-up apparatus, propelling as reproduction be recorded in the CD information or to the light source of cd-rom recording of information and the short wavelengthization of the LASER Light Source that is used, for example, make blue violet semiconductor laser, utilize the 2nd high frequency waves to carry out the blue SHC laser instrument etc. of the wavelength conversion of infrared semiconductor laser, wavelength is practical for the laser light source of 400-420nm.When using these blue violet semiconductor laser light sources, when using numerical aperture (NA) object lens identical with DVD (digital universal disc), can to diameter the information of the video disc recording 15-20GB of 12cm, being increased at the NA with object lens under 0.85 the situation, can be the information of the video disc recording 23-25GB of 12cm to diameter.Below, in this manual, will use the CD and the magneto-optic disk of blue-violet laser light source to be referred to as ' high density compact disc '.

In addition; using NA is in the high density compact disc of 0.85 object lens, because the coma aberration that disc tilt (skew: crooked) produces increase, so design protective seam thinner than DVD (with respect to the 0.6mm of DVD; be 0.1mm), to reduce the crooked coma aberration amount that causes.But, can be as long as think to the suitable recoding/reproduction information of such high density compact disc, the value of just not talkative product as compact disc player/writer is sufficient.At present, if according to DVD that sells the varied information of record or the reality of CD (compact disk), can be not enough only then to high density compact disc recoding/reproduction information, even if for example the user is to all DVD or CD recoding/reproduction information equally suitably, but improved the commodity value of the compact disc player/writer of using as high density compact disc like this.Under this background, have with the optical take-up apparatus on the compact disc player/writer the suitably performance of recoding/reproduction information of interchangeability limit is kept on the equal limit of high density compact disc and one of DVD and CD but expectation is loaded into high density compact disc.

As but high density compact disc and one of DVD and CD are all kept the suitably method of recoding/reproduction information of interchangeability limit in the limit, consideration is optionally switched high density compact disc optical system and DVD or the CD method with optical system corresponding to the recording density of the CD of recoding/reproduction information, but owing to need a plurality of optical systems, so be unfavorable for miniaturization, in addition, cost increases.

Therefore, in order to simplify the formation of optical take-up apparatus, realize cost degradation, with regard to optical take-up apparatus with interchangeability, preferably share high density compact disc with optical system and DVD or CD optical system, try one's best and reduce the number of the optics that constitutes optical take-up apparatus.In addition, share at the formation that object optical system is helped optical take-up apparatus most of CD configuration simplify, cost degradation.In addition, for the multiple CD that obtains having nothing in common with each other for the recoding/reproduction wavelength shared to object optical system, need in to object optical system, form the phase place structure of wavelength dependency with spherical aberration.

In the patent documentation 1, put down in writing a kind ofly have diffraction structure as phase place structure, can be used for jointly high density compact disc and existing DVD and CD to object optical system and loaded this optical take-up apparatus to object optical system.

Patent documentation 1: No. the 1304613rd, European publication

Yet, in the above-mentioned patent documentation 1 record can to 3 different discs carry out information record interchangeably and/or the optical take-up apparatus that reproduces in to the thing optical element owing to be along optical axis direction and object lens and form the structure that optical element that phase place constructs engages, so than relatively large, and it is heavy, when following the tracks of or focus on, make the burden of the actuator that drives it become big, therefore, existence has to use large-scale actuator, the densification that can't realize optical take-up apparatus and problem of energy saving.

Summary of the invention

The present invention has considered the problems referred to above and has made, its purpose is to provide a kind of and realizes constructing the optical take-up apparatus of simplification, cost degradation and to the thing optical element, this optical take-up apparatus loads following to the thing optical element, this has phase place structure to the thing optical element, can suitably carry out recording of information and/or reproduction to comprising the high density compact disc that uses the blue-violet laser light source and 3 kinds of different dishes of recording density of DVD and CD.

In order to address the above problem, it is the 1st light source of the 1st light beam of λ 1 that the optical take-up apparatus of item 1 has the wavelength of ejaculation; Penetrating wavelength is the 2nd light source of the 2nd light beam of λ 2 (λ 2＞λ 1); Penetrating wavelength is the 3rd light source of the 3rd light beam of λ 3 (λ 3＞λ 2); And light-gathering optics; making described the 1st beam condenser is on the information recording surface of the 1st optical information recording media of t1 to protective substrate thickness; making described the 2nd beam condenser is that t2 is (on the information recording surface of the 2nd optical information recording media of t1≤t2) to protective substrate thickness; making described the 3rd beam condenser is that t3 is (on the information recording surface of the 3rd optical information recording media of t2＜t3) to protective substrate thickness; wherein by will from the light beam of described light source through described light-gathering optics optically focused to the information recording surface of described optical information recording media; carry out recording of information and/or reproduction, it is characterized in that:

Described light-gathering optics comprises:

Single element lens to the thing optical element, this to the thing optical element be to described the 1st to the 3rd optical information recording media common use to the thing optical element, have the 1st phase place structure in light source side, have the 2nd phase place structure in the optical information recording media side, and at least one face is an aspheric surface;

Coupled lens, incide described to thing optical element from the outgoing beam of described the 1st light source in the mode of unlimited directional light in order to make at least, and make and incide describedly to the thing optical element from the outgoing beam of described the 2nd light source and the 3rd light source in the mode of unlimited directional light or weak limited diverging light, and be each independent or common use in described the 1st light source to the 3 light sources; With

Compensating element,, be configured in make at least the light beam that penetrates from described the 1st light source by and arrive described to the light path till the thing optical element,

Wherein, make the light beam that penetrates from described the 1st light source only by refraction action that described aspheric surface had or by of the combination of this refraction action with the optical effect that provides by at least one side described the 1st phase place structure and described the 2nd phase place structure, on the information recording surface of described the 1st optical information recording media, form the optically focused hot spot

Make the combination of the optical effect that the light beam that penetrates from described the 2nd light source provides by refraction action that described aspheric surface had and at least one side being constructed by described the 1st phase place structure and described the 2nd phase place, on the information recording surface of described the 2nd optical information recording media, form the optically focused hot spot

Make the combination of the light beam that penetrates from described the 3rd light source, formation optically focused hot spot on the information recording surface of described the 3rd optical information recording media by refraction action that described aspheric surface had and the optical effect that provides by at least one side described the 1st phase place structure and described the 2nd phase place structure.

Here, for can be to BD, DVD and CD recoding/reproduction information, the spherical aberration that needs spherical aberration that compensation causes by the protective layer thickness difference of BD and DVD and cause by the protective layer thickness difference of BD and CD.

On the other hand, for can be to HD-DVD, DVD and CD recoding/reproduction information, the spherical aberration that needs spherical aberration that compensation causes by the use wavelength difference of HD-DVD and DVD and cause by the protective layer thickness difference of HD-DVD and CD.

Like this, no matter under situation about using, in order to realize and the next exchange of DVD and CD that two kinds of spherical aberrations of all essential compensation are constructed so two phase places are set at least in to the thing optical element as the BD of high density compact disc and one of HD-DVD.

In addition, for the CD executive logging/reproduction stably to use blue-violet laser light source, the spherical aberration of essential adequate compensation light-gathering optics.Promptly, common object optical system is come high density compact disc and DVD and CD are carried out recording of information/reproduction interchangeably in order to use, expectation is carried out to the compensation of above-mentioned two kinds of spherical aberrations and to based in the compensation of using wavelength as the spherical aberration of the caused variations in refractive index of the temperature variation under the situation of the light beam of λ 1 (being called temperature characterisitic) satisfactory to both partiesly.

But, allow the thing optical element is further had based on the compensate function of the spherical aberration of temperature characterisitic to see it is unpractical from following two reasons.(1) under the situation of two phase places structures that in to the thing optical element, are formed for compensating above-mentioned two kinds of spherical aberrations, if further be provided for the phase place structure of compensation temperature characteristic in addition, then because the quantity of the phase place that the laser beam of each wavelength passes through structure becomes many, so cause the decline of the transmitance that shape error causes to become big problem.(2) though also can be used in the function that the phase place structure of the spherical aberration of compensation between optical information recording media has the temperature characterisitic that is used to compensate the bluish violet zone, but in this case, because it is little that the shape of phase place structure attenuates, so bigger to the influence of the caused refraction decrease in efficiency of the shape error of diffraction pattern.On the other hand, even if it is trickle to be designed to the shape invariance of phase place structure, also because the spherical aberration compensation function between optical information recording media or the spherical aberration compensation function in bluish violet zone are insufficient, so worry to realize the interchangeability between optical information recording media and the compensation of temperature characterisitic satisfactory to both partiesly.

Therefore, in the present invention, dispose temperature compensating element by arriving the described light path by the back to the thing optical element at the light beam that penetrates from described the 1st light source at least, even if use single element lens to the thing optical element, also can realize the interchangeability between optical information recording media and the compensation of temperature characterisitic satisfactory to both partiesly, 3 kinds of different optical information recording medias are suitably carried out recording of information and/or reproduction.

In addition, in above-mentioned 1 the formation, so-called ' weak limited diverging light ' is meant that when the optical system multiplying power was made as m, optical system multiplying power m satisfied following formula:

-1/100＜m＜0

In addition, so-called ' phase place structure ' is meant at each and takes turns the structure that interband is given phase differential.

In addition, so-called ' forming the optically focused hot spot ' is meant at the corrugated aberration to softening under (マレシヤ Le) state below the boundary, making light geometrical optics ground roughly be converged to 1 point.

Description of drawings

Fig. 1 is the pie graph that schematically illustrates optical take-up apparatus PU2.

Embodiment

In this manual; to use blue violet semiconductor laser or bluish violet SHG laser instrument to be referred to as ' high density compact disc ' with the CD (being also referred to as optical information recording media) of light source as information recording/regenerating; remove utilize NA be 0.85 object optical system is carried out recording of information/reproduction; and the thickness of protective seam is the CD (BD for example: the blue beam dish), also comprise and utilize NA for 0.65-0.67 object optical system to be carried out recording of information/reproduction of 0.1mm left and right sides specification; the thickness of protective seam is the CD (for example HD-DVD: also abbreviate HD as) of 0.6mm left and right sides specification.In addition, except that the thickness of the CD that on this information recording surface, has the CD of this protective seam, also be included in the diaphragm that has a few nm-tens nm left and right thicknesses on the information recording surface or protective seam or diaphragm be 0 CD.In addition, in this manual, in high density compact disc, also comprise and use blue violet semiconductor laser or bluish violet SHG laser instrument as the magneto-optic disk of information recording/regenerating with light source.

In addition, in this manual, so-called DVD is the general designation of DVD series CDs such as DVD-ROM, DVD-Video, DVD-Audio, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW, and so-called CD is the general designation of CD series CDs such as CD-ROM, CD-Audio, CD-Video, CD-R, CD-RW.In the recording density, high density compact disc is the highest, reduces successively by the order of DVD, CD.

The following describes and be used to realize that the best of above-mentioned purpose constitutes.

The optical take-up apparatus of item 2 is with regard to item 1 described optical take-up apparatus, and it is characterized in that: described temperature compensating element moves along optical axis direction by making at least one optical element, the spherical aberration that compensation is produced by temperature variation.

3 optical take-up apparatus is characterized in that with regard to item 1 described optical take-up apparatus: described temperature compensating element has the optical function face of the spherical aberration that compensation produces by temperature variation.As the optical function face, the optical surface of the phase place of being provided with structure etc. is for example arranged.Here, so-called ' optical function face ' is meant by light and reflects on this face or diffraction helps form the face of hot spot.

The optical take-up apparatus of item 4 is characterized in that with regard to item 1 described optical take-up apparatus: described temperature compensating element comprises the coupled lens that only passes through from the light beam of described the 1st light source.

The optical take-up apparatus of item 5 is characterized in that with regard to the described optical take-up apparatus of one of item 1-3: described temperature compensating element comprises by coupled lens arbitrary to the light beam of described the 3rd light source from described the 1st light source or two at least.

The optical take-up apparatus of item 6 is with regard to the described optical take-up apparatus of one of item 1-3, and it is characterized in that: described temperature compensating element comprises the optical beam expander optical system.

It is the 1st light source of the 1st light beam of λ 1 that the optical take-up apparatus of item 7 has the wavelength of ejaculation; Penetrating wavelength is the 2nd light source of the 2nd light beam of λ 2 (λ 2＞λ 1); Penetrating wavelength is the 3rd light source of the 3rd light beam of λ 3 (λ 3＞λ 2); And light-gathering optics; making described the 1st beam condenser is on the information recording surface of the 1st optical information recording media of t1 to protective substrate thickness; making described the 2nd beam condenser is that t1 is (on the information recording surface of the 2nd optical information recording media of t1≤t2) to protective substrate thickness; making described the 3rd beam condenser is that t3 is (on the information recording surface of the 3rd optical information recording media of t2＜t3) to protective substrate thickness; by will be to the information recording surface of described optical information recording media from the beam condenser of described light source through described light-gathering optics; carry out recording of information and/or reproduction, it is characterized in that:

Described light-gathering optics has

Single element lens to the thing optical element, this to the thing optical element be to described the 1st to the 3rd optical information recording media common use to the thing optical element, have the 1st phase place structure in light source side, have the 2nd phase place structure in the optical information recording media side, simultaneously, at least one face is an aspheric surface;

Coupled lens, in order to make at least outgoing beam incide described with unlimited directional light to the thing optical element from described the 1st light source, simultaneously, it is described to the thing optical element with unlimited directional light or weak limited diverging light outgoing beam from described the 2nd light source and the 3rd light source to be incided, to each independent or common use of described 1-the 3rd light source; With

Paraxial Chromatically compensated element, be configured at least the light beam that penetrates from described the 1st light source arrive by the back described to the light path before the thing optical element,

The refraction action that the light beam that penetrates from described the 1st light source only has by described aspheric surface or by this refraction action and the combination of constructing the optical effect that at least one side provides by described the 1st phase place structure and described the 2nd phase place, on the information recording surface of described the 1st optical information recording media, form the optically focused hot spot

Refraction action that the light beam that penetrates from described the 2nd light source has by described aspheric surface and the combination of constructing the optical effect that at least one side provides by described the 1st phase place structure and described the 2nd phase place, on the information recording surface of described the 2nd optical information recording media, form the optically focused hot spot

The refraction action that the light beam that penetrates from described the 3rd light source has by described aspheric surface and the combination of constructing the optical effect that at least one side provides by described the 1st phase place structure and described the 2nd phase place, formation optically focused hot spot on the information recording surface of described the 3rd optical information recording media.

As mentioned above, just for to 1-the 3rd optical information recording medium recorder and/or information reproduction and shared for object optical system, two kinds of spherical aberrations of essential compensation, but in order allowing the thing optical element to be had good interchangeability, to be desirably in two phase place structures of minimum formation in the thing optical element.

On the other hand, for the CD executive logging/reproduction stably to use blue-violet laser light source, the spherical aberration of essential adequate compensation light-gathering optics.That is, common object optical system is come high density compact disc and DVD and CD are carried out recording of information/reproduction interchangeably in order to use, expectation makes the compensation of aberration in the compensation of two kinds of spherical aberrations and bluish violet zone satisfactory to both parties.

But, allow the thing optical element is further had Chromatically compensated function see it is unpractical from following two reasons.(1) under the situation of two phase places structures that in to the thing optical element, are formed for compensating above-mentioned two kinds of spherical aberrations, if further be provided for the phase place structure of compensation temperature characteristic in addition, then because the quantity of the phase place that the laser beam of each wavelength passes through structure becomes many, so cause the decline of the transmitance that causes by shape error to become big problem.(2) though also can be used in the function that the phase place structure of the spherical aberration of compensation between optical information recording media has the aberration that is used to compensate the bluish violet zone, but in this case, because it is little that the shape of phase place structure attenuates, so bigger to the influence of the caused refraction decrease in efficiency of the shape error of diffraction pattern.On the other hand, even if it is trickle to be designed to the shape invariance of phase place structure, also because the spherical aberration compensation function between optical information recording media or the Chromatically compensated function in bluish violet zone are insufficient, so worry to realize the interchangeability between optical information recording media and the compensation of aberration satisfactory to both partiesly.

Therefore, in the present invention, by arrive by the back at the light beam that penetrates from described the 1st light source at least described to the light path of thing optical element the paraxial Chromatically compensated element of configuration, even if use single element lens to the thing optical element, also can realize the compensation of the aberration in interchangeability between optical information recording media and bluish violet zone satisfactory to both partiesly, 3 kinds of different optical information recording medias are suitably carried out recording of information and/or reproduction.

In addition, so-called ' aberration ' be meant before and after the wavelength variations, the dislocation of optically focused hot spot on optical axis direction.But, establish the optically focused hot spot here and be formed on the position of corrugated aberration minimum.Factor as wavelength variations, laser instrument vibration when supposing to comprise individual difference, mode hopping, the temperature variation of laser instrument, but because aberration becomes problem is the wavelength variations of not following etc. moment with respect to the action of the dislocation on the optical axis direction, actuator, so mainly be compensated for as object with mode hopping.

The optical take-up apparatus of item 8 is with regard to item 7 described optical take-up apparatus, and it is characterized in that: described Chromatically compensated element moves compensate for chromatic aberration by making at least one optical element along optical axis direction.

The optical take-up apparatus of item 9 is with regard to item 7 described optical take-up apparatus, and it is characterized in that: described Chromatically compensated element has the optical function face of compensate for chromatic aberration.

The optical take-up apparatus of item 10 is characterized in that with regard to the described optical take-up apparatus of one of item 7-9: described Chromatically compensated element comprises the coupled lens that only passes through from the light beam of described the 1st light source.

The optical take-up apparatus of item 11 is characterized in that with regard to the described optical take-up apparatus of one of item 7-9: described Chromatically compensated element comprises by coupled lens arbitrary to the light beam of described the 3rd light source from described the 1st light source or two at least.

The optical take-up apparatus of item 12 is with regard to the described optical take-up apparatus of one of item 7-9, and it is characterized in that: described Chromatically compensated element comprises the optical beam expander optical system.

The optical take-up apparatus of item 13 is with regard to the described optical take-up apparatus of one of item 1-12, it is characterized in that: described the 1st phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making displacement is corresponding to the hop count size of this surface level quantity height, and a path difference that is additional on λ 1 light beam by the section difference in each pattern of the 1st phase place structure is the integral multiple of λ 1.So-called ' overlapping type diffraction structure ' is meant the structure of a plurality of diffraction function setting in same one side.For example, be meant following structure, it is a plurality of optical functions zone at center that at least one optical function face is divided into the optical axis, it is the zone of the wheel belt shape at center that in this a plurality of optical functions zone at least one is divided into the optical axis, and, take turns the discontinuous section difference that specified quantity is set in the band, simultaneously, configuration is provided with the wheel band of this discontinuous segment difference continuously at each.Overlapping type diffraction structure is also referred to as multilevel structure, DOE structure, for example, diffraction structure is that the optical function face with optical element is divided into the optical axis is a plurality of bands of taking turns at center, should take turns band and forming zigzag respectively, and the structure of the stage shape of specified quantity also is set in this sawtooth portion.Thus, can provide diffraction to optical element with wavelength selectivity.In addition, the height in the hop count of stage shape or stage, width etc. can suitably design.Particularly, open in flat No. 1706018 the record as the spy.In addition, ' zigzag diffraction structure ' is an example of the diffraction structure of diffraction light expeditiously.

The optical take-up apparatus of item 14 is characterized in that with regard to the described optical take-up apparatus of one of item 1-12: described the 1st phase place structure is the zigzag diffraction structure.So-called ' zigzag diffraction structure ' is meant following structure, for example being about to that at least one optical function face is divided into the optical axis is a plurality of optical functions zone at center, it is the zone of the wheel belt shape at center that in this a plurality of optical functions zone at least one is divided into the optical axis, and, take turns the discontinuous section difference that specified quantity is set in the band at each, simultaneously, the optical axis direction cross section is a zigzag.

The optical take-up apparatus of item 15 is characterized in that with regard to the described optical take-up apparatus of one of item 1-12: described the 1st phase place structure is that path difference is given structure.' path difference is given structure ' is to have trickle section difference and divided a plurality of structures that band constitutes of taking turns by the central area that is included in optical axis and in the outside of this central area, be meant structure with following characteristic, promptly under set point of temperature, path difference at the integral multiple that sees through the wavelength that produces incident beam between the corrugated of adjacent wheels band, under the situation that temperature changes from described set point of temperature, follow change of refractive, see through the integral multiple that the path difference that produces between the corrugated of adjacent wheels band departs from the wavelength of incident beam.Path difference is given structure and is also referred to as NPS (Non Periodic Surface) structure, phase place structure.

The optical take-up apparatus of item 16 is with regard to the described optical take-up apparatus of one of item 1-15, it is characterized in that: described the 2nd phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making displacement is corresponding to the hop count size of this surface level quantity height, and a path difference that is additional on λ 1 light beam by the section difference in each pattern of the 2nd phase place structure is the integral multiple of λ 1.

The optical take-up apparatus of item 17 is characterized in that with regard to the described optical take-up apparatus of one of item 1-15: described the 2nd phase place structure is the zigzag diffraction structure.

The optical take-up apparatus of item 18 is characterized in that with regard to the described optical take-up apparatus of one of item 1-15: described the 2nd phase place structure is that path difference is given structure.

The optical take-up apparatus of item 19 is with regard to the described optical take-up apparatus of one of item 1-18; it is characterized in that: described the 1st phase place structure is that the light beam of λ 1 and light beam that wavelength is λ 3 are not brought into play diffraction effect to the wavelength of incident; wavelength to incident is the light beam performance diffraction effect of λ 2; the spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 1 of described the 1st optical information recording media and the protective substrate thickness t 2 of described the 2nd optical information recording media; or spherical aberration because of causing from the wavelength X 1 of the light beam of the 1st light source and wavelength difference from the wavelength X 2 of the light beam of the 2nd light source

Described the 2nd phase place structure is that the light beam of λ 1 and light beam that wavelength is λ 2 are not brought into play diffraction effect to the wavelength of incident; to the wavelength of incident is the light beam performance diffraction effect of λ 3, the spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 1 of described the 1st optical information recording media and the protective substrate thickness t 3 of described the 3rd optical information recording media.

The optical take-up apparatus of item 20 is with regard to item 19 described optical take-up apparatus, it is characterized in that: is under the situation of overlapping type diffraction structure at described the 1st phase place structure with described the 2nd phase place structure, and the path difference that is additional on the light beam that described wavelength is λ 1 by the difference of the section in the pattern of described overlapping type diffraction structure is the integral multiple of described wavelength X 1.

The optical take-up apparatus of item 21 is characterized in that with regard to item 20 described optical take-up apparatus: form the surface level that forms in each pattern of described the 1st phase place structure and described the 2nd phase place structure along basic aspheric surface.

The optical take-up apparatus of item 22 is with regard to item 21 described optical take-up apparatus; it is characterized in that: the basic aspheric surface that forms described the 1st phase place structure and described the 2nd phase place structure; so that when use described wavelength as the light beam of λ 1 when described thickness carries out recording of information as the protective substrate of t1 and/or reproduces in the information recording surface of described the 1st optical information recording media, spherical aberration the best.

The optical take-up apparatus of item 23 is with regard to the described optical take-up apparatus of one of item 20-22, it is characterized in that: described Abbe number vd the material 40～80 scopes in of thing optical element by object lens formed, surface level quantity in each pattern of described the 1st phase place structure is 5, and the surface level quantity in each pattern of described the 2nd phase place structure is 2.

The optical take-up apparatus of item 24 is with regard to the described optical take-up apparatus of one of item 20-22, it is characterized in that: described the thing optical element is formed by the material of Abbe number vd in 20～40 scopes, surface level quantity in each pattern of described the 1st phase place structure is 5, and the surface level quantity in each pattern of described the 2nd phase place structure is 3 or 4.

The optical take-up apparatus of item 25 is with regard to the described optical take-up apparatus of one of item 20-22, it is characterized in that: described have along optical axis direction joint 1st material of Abbe number vd in 40～80 scopes and the formation of 2nd material of Abbe number vd in 20～40 scopes the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, surface level quantity in each pattern of described the 1st phase place structure is 5, described the 2nd phase place structure is formed at the surface of described the 2nd material, and the surface level quantity in each pattern of the 2nd phase place structure is 3 or 4.

The optical take-up apparatus of item 26 is with regard to the described optical take-up apparatus of one of item 20-22, it is characterized in that: described have along optical axis direction joint 1st material of Abbe number vd in 40～80 scopes and the formation of 2nd material of Abbe number vd in 20～40 scopes the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, surface level quantity in each pattern of described the 1st phase place structure is 5, described the 2nd phase place structure is formed at the interface of described the 1st material and described the 2nd material, and the surface level quantity in each pattern of described the 2nd phase place structure is 3,4, one of 5.

The optical take-up apparatus of item 27 is with regard to the described optical take-up apparatus of one of item 19-26, it is characterized in that: the optical surface that forms described the 1st phase place structure and described the 2nd phase place structure is divided into middle section that comprises optical axis and the neighboring area that surrounds middle section, and described the 1st phase place structure and described the 2nd phase place structure are formed in the middle section respectively.

The optical take-up apparatus of item 28 is with regard to the described optical take-up apparatus of one of item 1-18; It is characterized in that: described the 1st phase place is configured in the diffraction light that produces the even number number of times when described wavelength is the light beam incident of λ 1; The spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 1 of described the 1st optical information recording media and the protective substrate thickness t 2 of described the 2nd optical information recording media or because of from the wavelength X 1 of the light beam of the 1st light source and the spherical aberration that causes from the wavelength difference of the wavelength X 2 of the light beam of the 2nd light source

29 optical take-up apparatus is characterized in that with regard to item 28 described optical take-up apparatus: when described the 1st phase place is configured in described wavelength and is the light beam incident of λ 1, produce the diffraction light of 8 times, 6 times, 2 numbers that take second place.

The optical take-up apparatus of item 30 is with regard to item 29 described optical take-up apparatus, it is characterized in that: at described the 2nd phase place structure is under the situation of overlapping type diffraction structure, and the path difference that is additional on the light beam that described wavelength is λ 1 by the difference of the section in the pattern of described overlapping type diffraction structure is the integral multiple of described wavelength X 1.

The optical take-up apparatus of item 31 is characterized in that with regard to item 30 described optical take-up apparatus: form the surface level that forms in each pattern of described the 2nd phase place structure along basic aspheric surface.

32 optical take-up apparatus is characterized in that with regard to item 30 or 31 described optical take-up apparatus: described Abbe number vd the material 40～80 scopes in of thing optical element by object lens formed, the interior surface level quantity of each pattern of described the 2nd phase place structure is 2.

The optical take-up apparatus of item 33 is with regard to item 30 or 31 described optical take-up apparatus, it is characterized in that: described Abbe number vd the material 20～40 scopes in of thing optical element by object lens formed, the surface level quantity in each pattern of described the 2nd phase place structure is 3 or 4.

The optical take-up apparatus of item 34 is with regard to item 30 or 31 described optical take-up apparatus, it is characterized in that: described have along optical axis direction joint 1st material of Abbe number vd in 40～80 scopes and the formation of 2nd material of Abbe number vd in 20～40 scopes the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, described the 2nd phase place structure is formed at the surface of described the 2nd material, and the surface level quantity in each pattern of the 2nd phase place structure is 3 or 4.

The optical take-up apparatus of item 35 is with regard to item 30 or 31 described optical take-up apparatus, it is characterized in that: described have along optical axis direction joint 1st material of Abbe number vd in 40～80 scopes and the formation of 2nd material of Abbe number vd in 20～40 scopes the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, described the 2nd phase place structure is formed at the interface of described the 1st material and described the 2nd material, and the interior surface level quantity of each pattern of described the 2nd phase place structure is one of 3,4,5.

The optical take-up apparatus of item 36 is with regard to the described optical take-up apparatus of one of item 20-35, it is characterized in that: the optical surface that forms described the 2nd phase place structure is divided into middle section that comprises optical axis and the neighboring area that surrounds middle section, and described the 2nd phase place structure is formed in the middle section.

The optical take-up apparatus of item 37 is with regard to the described optical take-up apparatus of one of item 1-18; It is characterized in that: described the 1st phase place is configured in the diffraction light that produces the even number number of times when described wavelength is the light beam incident of λ 1; The spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 1 of described the 1st optical information recording media and the protective substrate thickness t 2 of described the 2nd optical information recording media or because of from the wavelength X 1 of the light beam of the 1st light source and the spherical aberration that causes from the wavelength difference of the wavelength X 2 of the light beam of the 2nd light source

Described the 2nd phase place is configured in the diffraction light that produces the odd number number of times when described wavelength is the light beam incident of λ 1, the spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 1 of described the 1st optical information recording media and the protective substrate thickness t 3 of described the 3rd optical information recording media.

38 optical take-up apparatus is characterized in that with regard to item 37 described optical take-up apparatus: when described the 1st phase place is configured in described wavelength and is the light beam incident of λ 1, produce the diffraction light of 8 times, 6 times, 2 numbers that take second place,

When described the 2nd phase place is configured in described wavelength and is the light beam incident of λ 1, produce the diffraction light of 9 times, 7 times, 5 times, 3 numbers that take second place.

39 optical take-up apparatus is characterized in that with regard to item 37 or 38 described optical take-up apparatus: described Abbe number vd the material 20～40 scopes in of thing optical element by object lens formed.

The optical take-up apparatus of item 40 is with regard to item 37 or 38 described optical take-up apparatus, it is characterized in that: described have along optical axis direction joint 1st material of Abbe number vd in 40～80 scopes and the formation of 2nd material of Abbe number vd in 20～40 scopes the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, and described the 2nd phase place structure is formed at the surface of described the 2nd material.

The optical take-up apparatus of item 41 is with regard to the described optical take-up apparatus of one of item 1-18, it is characterized in that: the light beam that penetrates from described the 1st light source only forms the optically focused hot spot by described aspheric refraction action the information recording surface of described the 1st optical information recording media

The light beam that penetrates from described the 2nd light source is by described aspheric refraction action with based on the effect of described the 1st phase place structure, formation optically focused hot spot in the information recording surface of described the 2nd optical information recording media,

The light beam that penetrates from described the 3rd light source is by described aspheric refraction action with based on the effect of described the 2nd phase place structure, formation optically focused hot spot in the information recording surface of described the 3rd optical information recording media.

The optical take-up apparatus of item 42 is with regard to the described optical take-up apparatus of one of item 1-18, it is characterized in that: described the 1st phase place structure is that the light beam of λ 1 produces n1 time diffraction light to described wavelength, to described wavelength is that the light beam of λ 2 produces n2 time diffraction light, to described wavelength is that the light beam of λ 3 produces n3 time diffraction light

Described the 2nd phase place structure is that the light beam of λ 1 produces m1 time diffraction light to described wavelength, is that the light beam of λ 2 produces m2 time diffraction light to described wavelength, is the diffraction light of light beam generation m3 time of λ 3 to described wavelength,

Wherein, n1～n3, m1～m3 are natural number, n1 ≠ n2, n1 ≠ n3, m1 ≠ m2, m1 ≠ m3.

The optical take-up apparatus of item 43 is characterized in that with regard to the described optical take-up apparatus of one of item 1-42: described wavelength X 1 is 380nm＜λ 1＜420nm, and described wavelength X 2 is 630nm＜λ 2＜680nm, and described wavelength X 3 is 760nm＜λ 3＜830nm.

The optical take-up apparatus of item 44 is characterized in that with regard to the described optical take-up apparatus of one of item 1-43: the protective substrate thickness t 1 of described the 1st optical information recording media is 0.1mm or 0.6mm.

The optical take-up apparatus of item 45 is with regard to the described optical take-up apparatus of one of item 1-44, it is characterized in that: temperature compensating element is set, when the light beam that uses described wavelength as λ 2 carried out recording of information and/or reproduces in the information recording surface of described the 2nd optical information recording media, compensation was based on the spherical aberration of the described variations in refractive index that the temperature variation of thing optical element is caused.

46 optical take-up apparatus is characterized in that with regard to the described optical take-up apparatus of one of item 1-45: described the thing optical element is made by low melting point glass.

47 optical take-up apparatus is characterized in that with regard to the described optical take-up apparatus of one of item 1-45: described to the thing optical element by resin manufacture.

The optical take-up apparatus of item 48 is with regard to the described optical take-up apparatus of one of item 1-45, it is characterized in that: describedly make resin bed be fitted in the lens surface of glass the thing optical element, on the surface of described resin bed, form described the 1st phase place structure or described the 2nd phase place structure.

The optical take-up apparatus of item 49 is characterized in that with regard to item 47 or 48 described optical take-up apparatus: it is that the particle that is less than or equal to 30nm disperses that described resin makes diameter.

50 optical take-up apparatus is characterized in that with regard to item 49 described optical take-up apparatus: described the thing optical element is met the following conditions:

|A|＜8×10 ^-5，

Wherein, A is the value that is expressed from the next,

[formula 2]

A = \frac{(n^{2} + 2) (n^{2} - 1)}{6 n} {(- 3 a) + \frac{1}{[R]} \frac{&PartialD; [R]}{&PartialD; t}}

α: linear expansion coefficient, [R]: molecular refraction.

The temperature variation of refractive index is described.The temperature variation of refractive index, is represented by following formula 2 by come differential refractive index n with temperature t according to Lorentz Lorentz formula.

Under the situation of resin raw material, the 2nd help is generally little than the 1st, can ignore basically.For example, under the situation of PMMA resin, linear expansion coefficient α is 7 * 10 ^-5, if the above-mentioned formula of substitution then becomes-1.2 * 10 ^-4, with the measured value basically identical.

Here, in the present invention, by make particulate, preferably inorganic fine particles is distributed in the resin, increases the 2nd help of above-mentioned formula in fact, offset with the variation that causes with the 1st linear expansion.

Particularly, will be-1.2 * 10 in the past preferably ^-4About variation be suppressed to absolute value less than 10 * 10 ^-5In addition, best less than 8 * 10 ^-5, be more preferably less than 6 * 10 ^-5In optical design or best as optical element.

In addition, also can further increase the 2nd help, have the temperature characterisitic opposite with initial resin material.That is, also can obtain rising the stock that refractive index does not descend, opposite refractive index increases by temperature.

51 optical take-up apparatus is characterized in that with regard to item 50 described optical take-up apparatus: described the thing optical element is met the following conditions: | A|＜6 * 10 ^-5

52 optical take-up apparatus is characterized in that with regard to item 50 or 51 described optical take-up apparatus: described the thing optical element is met the following conditions: 0＜A＜8 * 10 ^-4

The optical take-up apparatus of item 53 is with regard to the described optical take-up apparatus of one of item 49-52, and it is characterized in that: described particle is an inorganic material.

The optical take-up apparatus of item 54 is with regard to item 53 described optical take-up apparatus, and it is characterized in that: described inorganic material is an oxide.

The optical take-up apparatus of item 55 is with regard to item 54 described optical take-up apparatus, and it is characterized in that: described oxide is the saturated state of oxidation.

The optical take-up apparatus of item 56 is characterized in that: add antioxidant in described resin with regard to the described optical take-up apparatus of one of item 49-55.

The optical take-up apparatus of item 57 is with regard to the described optical take-up apparatus of one of item 49-56, and it is characterized in that: the volume ratio of described resin and described particle is 9: 1 or 3: 2.

58 optical take-up apparatus to the thing optical element; the 1st light beam by the 1st wavelength X 1 that will penetrate from the 1st light source forms the optically focused hot spot protective substrate thickness is the information recording surface of the 1st optical information recording media of t1; the reproduction of execution information and/or record; the 2nd light beam by the 2nd wavelength X 2 (λ 1＜λ 2) that will penetrate from the 2nd light source is that t2 (forms the optically focused hot spot the information recording surface of the 2nd optical information recording media of t1≤t2) at protective substrate thickness; the reproduction of execution information and/or record; the 3rd light beam by the 3rd wavelength X 3 (λ 2＜λ 3) that will penetrate from the 3rd light source is that t3 (forms the optically focused hot spot the information recording surface of the 3rd optical information recording media of t2＜t3) at protective substrate thickness; the reproduction of execution information and/or record is characterized in that:

Described to the thing optical element be to described the 1st to the 3rd optical information recording media common use to the thing optical element, be to have two phase places structures such as the 1st phase place structure and the 2nd phase place structure, simultaneously, at least one face be aspheric 1 group of formation to the thing optical element

Described the 1st light beam to the light utilization ratio of arbitrary light beam of described the 3rd light beam is below 50%.

By the thing optical element being made as 1 group of formation with described, utilize simplification, cost degradation, the lightweight of manufacturing process, can realize driving the miniaturization of described actuator to the thing used for optical elements.In addition, utilize the 1st phase place structure to obtain the exchange of the 1st optical information recording media and the 2nd optical information recording media, utilize the 2nd phase place structure to obtain the exchange of the 2nd optical information recording media and the 3rd optical information recording media, in addition, the light utilization ratio of arbitrary light beam in 3 light beams is made as is less than or equal to 50%, can reduce 3 difference of magnifications between wavelength thus.

In addition, here so-called ' light utilization ratio ' is meant and will be made as A to thing optical element, the light quantity that is formed in the surface area of the optically focused hot spot on the information recording surface of optical information recording media by of the present invention, by form by same material and have thickness on identical focal length, the axle, numerical aperture, corrugated aberration, do not form the 1st phase place structure and the 2nd phase place structure to the thing optical element, be formed at light quantity in the area dish of the optically focused hot spot on the information recording surface of optical information recording media when being made as B, the value of utilizing A/B to calculate.

59 described to the thing optical element for the thing optical element with regard to item 58, it is characterized in that: described smooth utilization ratio is that to be less than or equal to 50% light beam be described the 3rd wavelength, and the light utilization ratio of described the 1st light beam and described the 2nd light beam is all more than or equal to 75%.

If with the light utilization ratio is to be less than or equal to 50% light beam to be made as the 3rd light beam, even if then (for example the 1st wavelength X 1 is the bluish violet wavelength under the 1st wavelength X 1 is roughly 2 times the situation of relation of the 3rd wavelength X 3, the 3rd wavelength X 3 is under the situation of infrared wavelength), that also can utilize phase place structure is used for compensating spherical aberration to the 3rd light beam, so can improve the recording to the 3rd optical information recording media.In addition, because the light utilization ratio of the 1st light beam and the 2nd light beam is more than or equal to 75%, thus can provide also can corresponding to the 1st big to recording density, as to require writing speed high speed optical information recording media or the 2nd optical information recording media write at a high speed to the thing optical element.

60 for the thing optical element with regard to item 58 or 59 described to the thing optical element, it is characterized in that: described the 1st phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making displacement is corresponding to the height of the hop count of this surface level quantity, and this overlapping type diffraction structure has the wavelength selectivity that does not make described the 1st light beam and described the 3rd beam diffraction, makes the diffraction of described the 2nd beam diffraction.

If use 60 a described overlapping type diffraction structure to be used as the 1st phase place structure, then owing to can independently controlling the phase place of the 2nd light beam, so can compensate spherical aberration well to the 2nd light beam with wavelength selectivity of diffraction.As a result, can provide recording to the 2nd optical information recording media good to the thing optical element.

61 described to the thing optical element for the thing optical element with regard to item 60, it is characterized in that: the path difference that is additional on described the 1st light beam by a section difference of described overlapping type diffraction structure is 2 * λ 1, so be set in 2 times the degree of depth that is equivalent to the 1st wavelength X 1 by a section difference by the path difference conversion, can all guarantee high diffraction efficiency (transmitance) to the light beam of any wavelength with overlapping type diffraction structure.

62 described to the thing optical element for the thing optical element with regard to item 61, it is characterized in that: the surface level number of described regulation is 5.The diffraction efficiency that is received the light beam of diffraction by overlapping type diffraction structure depends on that not only a section is poor, also depends on surface level quantity.By this surface level quantity is set at 5, can make the diffraction efficiency maximum of the 2nd light beam.

63 for the thing optical element with regard to item 58 or 59 described to the thing optical element, it is characterized in that: described the 1st phase place structure is the zigzag diffraction structure, establishing the diffraction number of times with maximum diffraction light quantity in the diffraction light that produces when described the 1st light beam incides described sawtooth diffraction structure is dor1, diffraction number of times with maximum diffraction light quantity in the diffraction light that produces when described the 2nd light beam incides described sawtooth diffraction structure is dor2, when the diffraction number of times with maximum diffraction light quantity in the diffraction light that produces when described the 3rd light beam incides described sawtooth diffraction structure is dor3, when satisfying following formula, describedly make described dor1 the diffraction light optically focused of described the 1st light beam in the information recording surface of described the 1st optical information recording media to the thing optical element, described dor2 the diffraction light optically focused that makes described the 2nd light beam is in the information recording surface of described the 2nd optical information recording media, described dor3 the diffraction light optically focused that makes described the 3rd light beam is in the information recording surface of described the 3rd optical information recording media

Dor1＞dor2 〉=dor3, wherein, dor1 is an even number.

As the 1st phase place structure, also can use 63 a described sawtooth pattern diffraction structure with wavelength selectivity of diffraction number of times, can all have high diffraction efficiency at light beam to any wavelength in, compensate spherical aberration well to the 2nd light beam.

64 described to the thing optical element for the thing optical element with regard to item 63, it is characterized in that: described diffraction number of times dor1 is 2, described diffraction number of times dor2 is 1, described diffraction number of times dor3 is 1.If the diffraction number of times dor1 of the 1st light beam is made as 2, the diffraction number of times dor2 of the 2nd light beam is made as 1, the diffraction number of times dor3 of the 3rd light beam is made as 1, then can make the compensation characteristic of the spherical aberration of the 2nd light beam best.

65 described to the thing optical element for the thing optical element with regard to one of item 58-64, it is characterized in that: described the 2nd phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making displacement is corresponding to the height of the hop count of this surface level quantity, and this overlapping type diffraction structure has the wavelength selectivity that does not make described the 1st light beam and described the 2nd beam diffraction, makes the diffraction of described the 3rd beam diffraction.

If use 65 a described overlapping type diffraction structure to be used as the 1st phase place structure, then owing to can independently controlling the phase place of the 3rd light beam, so can compensate spherical aberration well to the 3rd light beam with wavelength selectivity of diffraction.As a result, can provide recording to the 3rd optical information recording media good to the thing optical element.

66 described to the thing optical element for the thing optical element with regard to item 65, it is characterized in that: the path difference that is additional on described the 1st light beam by a section difference of described overlapping type diffraction structure is 5 * λ 1.

Be set in 5 times the degree of depth that is equivalent to the 1st wavelength X 1 if a section difference of overlapping type diffraction structure converted by path difference, then utilize this section difference to be additional to path difference on the 2nd light beam and become 3 times of the 2nd wavelength X 2.Thus, can improve the transmitance of the 1st light beam and the 2nd light beam, can provide also can corresponding to write at a high speed to the 1st optical information recording media and the 2nd optical information recording media to the thing optical element.

67 described to the thing optical element for the thing optical element with regard to item 66, it is characterized in that: the surface level number of described regulation is 2.The diffraction efficiency that is set at 2, the 3 light beams by the surface level quantity with overlapping type diffraction structure becomes about 40%, can the difference of magnification between 3 wavelength is kept little in, compensation is to the spherical aberration of the 3rd light beam.Thus, also can between the light beam of 3 wavelength, share, can realize the miniaturization and the cost degradation of optical take-up apparatus the optical element beyond the thing optical element.

68 described to the thing optical element for the thing optical element with regard to item 67, it is characterized in that: incide under the situation of described overlapping type diffraction structure at described the 3rd light beam, its light quantity is assigned to two diffraction lights basically, described to the thing optical element make in described two diffraction lights, the focal position away from described diffraction light optically focused to thing optical element one side to the information recording surface of described the 3rd optical information recording media.Like this, in having set the overlapping type diffraction structure of surface level quantity, the light quantity of the 3rd light beam is assigned to ± 1 diffraction light basically.If determine the diffraction of overlapping type diffraction structure, with compensate in these two diffraction lights, the focal position is away from the spherical aberration to the diffraction light of thing optical element, then can fully guarantee the operating distance to the 3rd optical information recording media.

69 described to the thing optical element for the thing optical element with regard to one of item 58-64, it is characterized in that: described the 2nd phase place structure is the zigzag diffraction structure, establishing the diffraction number of times with maximum diffraction light quantity in the diffraction light that produces when described the 1st light beam incides described sawtooth diffraction structure is dor1 ', diffraction number of times with maximum diffraction light quantity in the diffraction light that produces when described the 2nd light beam incides described sawtooth diffraction structure is dor2 ', when the diffraction number of times with maximum diffraction light quantity in the diffraction light that produces when described the 3rd light beam incides described sawtooth diffraction structure is dor3 ', when satisfying following formula, describedly make the inferior diffraction light optically focused of described dor1 ' of described the 1st light beam in the information recording surface of described the 1st optical information recording media to the thing optical element, the inferior diffraction light optically focused of described dor2 ' that makes described the 2nd light beam is in the information recording surface of described the 2nd optical information recording media, the inferior diffraction light optically focused of described dor3 ' that makes described the 3rd light beam is in the information recording surface of described the 3rd optical information recording media

Dor1 '＞dor2 ' 〉=dor3 ', wherein, dor1 ' is an odd number.

As the 2nd phase place structure, if use 69 a described sawtooth pattern diffraction structure, then can guarantee high diffraction efficiency to the 1st light beam and the 2nd light beam with wavelength selectivity of diffraction number of times, simultaneously, can compensate spherical aberration well to the 3rd light beam.As a result of, can provide recording to the 3rd optical information recording media good to the thing optical element.

70 described to the thing optical element for the thing optical element with regard to item 69, it is characterized in that: described diffraction number of times dor1 ' is 3, described diffraction number of times dor2 ' is 2, described diffraction number of times dor3 ' is 2.If establishing the diffraction number of times dor1 ' of the 1st light beam is 3, the diffraction number of times dor2 ' of the 2nd light beam is 2, the diffraction number of times dor3 ' of the 3rd light beam is 1, then the diffraction efficiency of the 3rd light beam becomes about 45%, can the difference of magnification between 3 wavelength is kept little in, compensation is to the spherical aberration of the 3rd light beam.Thus, also can between the light beam of 3 wavelength, share, can realize the miniaturization and the cost degradation of optical take-up apparatus the optical element beyond the thing optical element.

71 described to the thing optical element for the thing optical element with regard to one of item 58-70, it is characterized in that: described the 1st phase place structure is formed on the optical surface of light source side, described the 2nd phase place structure is formed on the optical surface of optical information recording media side.Thus, the amount of spherical aberration of compensation can be constructed the wheel interband of the 1st phase place structure of Duoing apart from guaranteeing greatly than the 2nd phase place.

72 described to the thing optical element for the thing optical element with regard to one of item 58-71, it is characterized in that: be m1 when establishing design multiplying power to described the 1st wavelength, to establish design multiplying power to described the 2nd wavelength be m2, establish design multiplying power to described the 3rd wavelength when being m3, meet the following conditions

m1＝m2＝0

-0.15≤m3≤0。

By satisfying following formula, can the tracking with to the 1st optical information recording media and the 2nd optical information recording medium recorder/reproduction the time drive the coma aberration that is produced and become 0, simultaneously, can compensate spherical aberration well to the 3rd light beam.

73 described to the thing optical element for the thing optical element with regard to one of item 58-72, it is characterized in that: be less than or equal to the low melting point glass manufacturings of 400 degree by tr pt Tg.By using this low-melting glass, can be when realizing the mould long lifetime, the viscosity during owing to fusion is low, so can utilize moulding to transcribe the phase place structure well.As this tr pt Tg is the low melting point glass that is less than or equal to 400 degree, and K-PG325, the K-PG375 of field optics society system arranged.

74 described to the thing optical element for the thing optical element with regard to one of item 58-72, it is characterized in that: by resin manufacture.Described by using to the thing optical element, can owing to light weight, reduce with the mass-produced at an easy rate while of stable performance so can realize focusing on the power consumption that drives or follow the tracks of the actuator that drives usefulness, type can diminish actuator.In addition, because the viscosity of molten condition is low, so can utilize moulding to transcribe the phase place structure well.

75 described to the thing optical element for the thing optical element with regard to one of item 58-72, it is characterized in that: make resin bed be fitted in the lens surface of glass,, form described the 1st phase place structure or described the 2nd phase place structure on the surface of described resin bed.By using the stock of glass, can provide good temp characteristic to the thing optical element.In addition, as the material as resin bed, ultraviolet curable resin or heat-curing resin are fit on making.

76 for the thing optical element with regard to item 74 or 75 described to the thing optical element, it is characterized in that: follow the symbol of variations in refractive index rate of temperature variation opposite with described resin, making diameter is that the particle that is less than or equal to 30nm is distributed in the described resin.

Symbol as if the variations in refractive index rate of following temperature variation is opposite with described resin, and making diameter is that the particle that is less than or equal to 30nm is distributed in the resin, then obtains when keeping the mouldability of resin, follows the little material of variations in refractive index of temperature variation.Thus, can be provided at and can utilize moulding to come with the mass-produced at an easy rate while of stable performance, light weight and follow the variations in refractive index of temperature variation little to the thing optical element.

In this manual, so-called the thing optical element is meant under the state that optical information recording media is seated in the optical take-up apparatus, on the position of the most close optical information recording media side, configuration, that the have the optically focused effect relatively optical element of Ying Yuqi.

According to the present invention, as a kind of optical take-up apparatus, load following to the thing optical element, this has the phase place structure to the thing optical element, can use high density compact disc and 3 kinds of dishes DVD and CD, that recording density is different of blue-violet laser light source suitably carry out recording of information and/or reproduction to comprising, can obtain realizing its constitute simplify, the optical take-up apparatus of cost degradation and to the thing optical element.

Below, with figure embodiments of the present invention are described.At first, with Fig. 1 optical take-up apparatus of the present invention is described.In addition, the optical take-up apparatus PU1 of present embodiment can be assembled in the optical disc apparatus.

Fig. 1 schematically illustrates high density compact disc BD, DVD and the arbitrary pie graph that can suitably carry out the optical take-up apparatus PU1 of recording of information/reproduction of CD.The optical specification of BD is wavelength X 1=405nm; the thickness t 1=0.1mm of protective seam PL1; numerical aperture NA1=0.85; the optical specification of DVD is wavelength X 2=655nm; the thickness t 2=0.6mm of protective seam PL2, numerical aperture NA2=0.65, the optical specification of CD is wavelength X 3=785nm; the thickness t 3=1.2mm of protective seam PL3, numerical aperture NA3=0.51.But the thickness of wavelength, protective seam and the combination of numerical aperture are not limited thereto.

Optical take-up apparatus PU1 comprises: blue violet semiconductor laser LD (the 1st light source), and luminous when BD being carried out recording of information/reproductions, the bluish violet color laser light beam (the 1st light beam) of ejaculation 405nm; Laser module LM has the 2nd luminous point EP2 (the 3rd light source), sensitization of the laser beam (the 3rd light beam) of luminous when DVD being carried out recording of information/reproductions, as to penetrate the laser beam (the 2nd light beam) of 655nm the 2nd luminous point EP1 (the 2nd light source), luminous when CD being carried out recording of information/reproduction, ejaculation 785nm from the 1st photographic department DS1 of the folded light beam of the information recording surface RL2 of DVD, sensitization the 2nd photographic department DS2 and the prism PS from the folded light beam of the information recording surface RL3 of CD; The photodetector PD that BD uses; To thing optical element OL, two faces that the laser beam with the incident of making converges to the function on information recording surface RL1, RL2, the RL3 are aspheric surface, in light source side the 1st phase place structure are set, and in the CD side the 2nd phase place structure are set; 2 shaft actuator AC1; 1 shaft actuator AC2; Optical beam expander EXP is configured in the common light path that 1-the 3rd light beam passes through jointly, is made of the 1st lens L1 and the 2nd lens L2 that can utilize 1 shaft actuator AC2 along the optical axis direction displacement; The 1st polarized beam splitting device BS1; The 2nd polarized beam splitting device BS2; 1/4 wavelength plate QWP; To the sensor leads SEN that uses from the additional astigmatism of the folded light beam of information recording surface RL1; The 1st collimation lens COL1 is configured in the special-purpose light path that only the 1st light beam passes through, and is parallel beam with the 1st optical beam transformation; The 2nd collimation lens COL2 is a parallel beam with the 2nd light beam and the 3rd optical beam transformation.In addition, the light source as BD uses except that above-mentioned blue violet semiconductor laser LD1, also can use bluish violet SHG laser instrument.

With regard to optical take-up apparatus PU1, when BD being carried out recording of information/reproductions, utilize the position of the optical axis direction of 1 shaft actuator AC2 adjustment lens L1, penetrate the 1st light beam with the state of parallel beam from optical beam expander EXP, afterwards, make blue violet semiconductor laser LD luminous.Among Fig. 1; its opticpath of stating of line drawing is such strictly according to the facts; the divergent beams that penetrate from blue violet semiconductor laser LD1 by the 1st polarized beam splitting device BS1 reflection after; be transformed to parallel beam by collimation lens; by optical beam expander EXP expansion diameter,, come the confine optical beam diameter by not shown aperture by 1/4 wavelength plate QWP; state with directional light incides after the thing optical element OL, and from then on the protective seam PL1 through BD constitutes the hot spot that is formed on the information recording surface RL1.At this moment, only utilize the refraction action that the aspheric surface to thing optical element OL has or the combination of this refraction action and the optical effect that provides one of at least by the 1st phase place structure and the 2nd phase place structure is provided, on the information recording surface RL1 of BD, form the optically focused hot spot.Utilizing the 2 shaft actuator AC1 that are configured on its periphery to carry out to thing optical element OL focuses on or follows the tracks of.

After folded light beam after information recording surface RL1 is by the information pits modulation sees through thing optical element OL, 1/4 wavelength plate QWP, optical beam expander EXP and the 2nd polarized beam splitting device BS2 once more, become converging beam by the 1st collimation lens COL1, after seeing through the 1st polarized beam splitting device BS1, by the additional astigmatism of sensor leads SEN, converge on the light-sensitive surface of photodetector PD.In addition, can use the output signal of photodetector PD to come the information of reading and recording in BD.

In addition, with regard to optical take-up apparatus PU1, when DVD being carried out recording of information/reproduction, utilize 1 shaft actuator AC2 to adjust the position of the optical axis direction of lens L1, state with parallel beam penetrates the 2nd light beam from optical beam expander EXP, afterwards, makes the 1st luminous point EP1 luminous.Among Fig. 1, as its opticpath that dotted line is described, the divergent beams that penetrate from the 1st luminous point EP1 by prism PS reflection after, be transformed to parallel beam by the 2nd collimation lens COL2.Afterwards; after by the 2nd polarized beam splitting device BS2 reflection, by optical beam expander EXP expansion diameter; by 1/4 wavelength plate QWP, after the state with directional light incided thing optical element OL, from then on the protective seam PL2 through DVD constituted the hot spot that is formed on the information recording surface RL2.At this moment, utilize the combination of refraction action that the aspheric surface to thing optical element OL has and the optical effect that provides one of at least by the 1st phase place structure and the 2nd phase place structure, formation optically focused hot spot on the information recording surface RL2 of DVD.Utilizing the 2 shaft actuator AC1 that are configured on its periphery to carry out to thing optical element OL focuses on or follows the tracks of.

Folded light beam after information recording surface RL2 is by the information pits modulation by the 2nd polarized beam splitting device BS2 reflection, is transformed to converging beam by the 2nd collimation lens COL2 after seeing through thing optical element OL, 1/4 wavelength plate QWP, optical beam expander EXP once more.Afterwards, in prism, behind 2 secondary reflections, converge on the 1st photographic department DS1.In addition, can use the output signal of the 1st photographic department DS1 to come the information of reading and recording in DVD.

In addition, with regard to optical take-up apparatus PU1, when CD being carried out recording of information/reproduction, utilize 1 shaft actuator AC2 to adjust the position of the optical axis direction of lens L1, state with parallel beam penetrates the 3rd light beam from optical beam expander EXP, afterwards, makes the 2nd luminous point EP2 luminous.Among Fig. 1, as its opticpath that dot-and-dash line is described, the divergent beams that penetrate from the 2nd luminous point EP2 by prism PS reflection after, be transformed to parallel beam by the 2nd collimation lens COL2.Afterwards; after by the 2nd polarized beam splitting device BS2 reflection, by optical beam expander EXP expansion diameter; by 1/4 wavelength plate QWP; after the state with directional light or weak limited diverging light incided thing optical element OL, from then on the protective seam PL3 through CD constituted the hot spot that is formed on the information recording surface RL3.At this moment, utilize the combination of refraction action that the aspheric surface to thing optical element OL has and the optical effect that provides one of at least by the 1st phase place structure and the 2nd phase place structure, formation optically focused hot spot on the information recording surface RL3 of CD.Utilizing the 2 shaft actuator AC1 that are configured on its periphery to carry out to thing optical element OL focuses on or follows the tracks of.

Folded light beam after information recording surface RL3 is by the information pits modulation by the 2nd polarized beam splitting device BS2 reflection, is transformed to converging beam by the 2nd collimation lens COL2 after seeing through thing optical element OL, 1/4 wavelength plate QWP, optical beam expander EXP once more.Afterwards, in prism, behind 2 secondary reflections, converge on the 2nd photographic department DS2.In addition, can use the output signal of the 2nd photographic department DS2 to come the information of reading and recording in CD.

In addition, in the present embodiment, because of temperature variation produce the situation of variations in refractive index under with the 2nd light beam to thing optical element OL with the 1st light beam or DVD at incident BD, by by actuator AC2 the lens L1 as the optical beam expander EXP of temperature compensating element being moved along optical axis direction correspondingly, can compensate the spherical aberration of generation.

Perhaps, in the present embodiment, when BD incides situation to thing optical element OL with the 1st light beam under, move along optical axis direction, can compensate the aberration of generation by make lens L1 by actuator AC2 as the optical beam expander EXP of Chromatically compensated element.

This temperature compensating element or colorimetric compensation element are not limited to optical beam expander EXP, also can be the 1st collimation lens COL1.In this case, as long as move the 1st collimation lens COL1, but, can compensate the spherical aberration or the aberration of the variations in refractive index that causes based on temperature variation in its optical surface by the phase place structure is set along optical axis direction.

It is above-mentioned that thing optical element OL is preferably used glass or makes diameter is that the resin that is less than or equal to the oxide dispersion of 30nm forms.

Generally, if micropowder is blended in the transparent resin material, then produce scattering of light, transmitance descends, thus be difficult to as optical material, but, in fact can not produce scattering as can be known by making micropowder form the size littler than the wavelength of transmitted beam.

Plastic resin (also can abbreviate resin as) rises along with temperature, and refractive index descends, but inorganic particulate is along with temperature rises, and refractive index rises.Therefore, also know by their the character effect that cancels each other out, thereby do not produce variations in refractive index.The inorganic particulate that optical element of the present invention is less than or equal to 30 nanometers, is preferably less than or equals 20 nanometers by making, be more preferably the 10-15 nanometer is distributed to as the material in the resin of stock and forms.Therefore, can provide the temperature dependency that do not have refractive index or the low-down optical element of temperature dependency of refractive index.

For example, make niobium oxide (Nb ₂O ₅) particulate be distributed in the allyl resin.Volume ratio as the plastics of stock is 80, and the ratio of niobium oxide is about 20, with they even mixing.There is the problem of cohesion easily in particulate, provides electric charge to make it technology such as dispersion but utilize to particle surface, can produce necessary disperse state.

As described later, the mixing of resin and particle, online execution when disperseing to be preferably in the ejection formation of optical element.At this moment, after mixing, disperseing, be shaped to before the optical element, preferably do not cool off, solidify.

In addition,, can suitably increase and decrease this volume ratio, also can mix and make it behind the multiple nano-scale inorganic particulate to disperse in order to control refractive index to the variation of temperature ratio.

Ratio is 80: 20 in above-mentioned example, promptly 4: 1, but can suitably adjust between (9: 1)-60: 40 (3: 2) at 90: 10.If lacked than 9: 1, then temperature variation inhibition effect diminishes, and on the contrary, if surpass 3: 2, then the mouldability owing to resin has problems, so bad.

Particulate is inorganics preferably, and oxide preferably.In addition, preferably the state of oxidation saturated, be more preferably unoxidized oxide.

Being that inorganics is in order to suppress lowly with the reaction as the plastic resin of macromolecular organic compound, in addition, is the deterioration that oxide can prevent to follow use.Especially waited under the harsh condition in high temperatureization or irradiating laser, easy accelerating oxidation is if but the particulate of this inorganic oxide then can be prevented the deterioration that oxidation causes.

In addition, for the resin oxidation that prevents that other factors from causing, much less, also can add antioxidant.And, as the plastic resin of stock preferably suitably adopt special be willing to 2002-308933 number, specially be willing to 2002-309040 number, special resin described in being willing to 2002-308964 number etc.

Below, the method to the thing optical element of moulding present embodiment is described.As mentioned above, just make particle be distributed to technology in the finely divided resin, the known method that allows particle have electric charge.

For example, tabular plastic resin is filled in the container, makes particle inject in this container, disperse, heat in this container, make the plastic resin fusion.At this moment, dispersed particle is dispersed in the plastic resin of fusion.At this moment, in order to prevent precipitation, also can stir or apply electric field, magnetic field, or ultrasound wave is provided.

In addition, also consider when making the plastic resin ejection formation of fusion, use and wait the method for adding particle at the embedding stirrer.At this moment, because be mixed into spiral fashion on line, so can form disperse state well.

Here, make disperseed the cooling of atomic plastic resin one end, solidified after, when fusion and ejection formation, utilize heating, fusion more once more, disperse state changes, or produces small sintering in the resin of particle periphery, so bad.Especially producing under the situation of sintering, the position of sintering, light penetration can descend, and worry can not be used as optical element.

Therefore, preferably make a fusion of plastic resin, and the limit disperses particle, the limit keeps the state of fusion and dispersion constant, obtains the moulding product.That is, being preferably in and making diameter is after the particle that is less than or equal to 30 nanometers is distributed in the plastic resin of molten condition, to keep molten condition to flow into unchangeably in the mould, obtains the moulding product.

In the above embodiment, as the example of high density compact disc, BD for example is even if but HD-DVD also can carry out recording of information/reproduction equally interchangeably.In addition, in following embodiment 1-4, the neighboring area of object lens is the aspheric surfaces that do not have diffraction structure, when the light beam of provision wavelengths passes through, only produce flash of light, form suitable optically focused hot spot, but also carry out the opening restriction energetically for fear of the bad influence of flash of light by refraction action, shown in embodiment 5, also diffraction structure can be set here.

(embodiment 1)

The following describes embodiment.Embodiment 1 be suitable for optical take-up apparatus shown in Figure 1 to the thing optical element.Table 1 illustrates the lens data of embodiment 1.In addition, after this (lens data that comprises table) represents 10 degree (for example 2.5 * 10 with E (for example 2.5E-3) ^-3).

[table 1]

Embodiment 1 lens data

The focal distance f of object lens ₁=2.2mm f ₂=2.15mm f ₃=2.82mm

Image planes side numerical aperture NA1:0.85 NA2:0.65 NA3:0.51

Multiplying power m1:0 m2:0 m3:0

The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)
The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)	0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ3.74mm)		0.0(φ3.74mm)		0.0(φ3.74mm)		0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ3.74mm)		0.0(φ3.74mm)		0.0(φ3.74mm)		2	1.4039	2.60	1.5245	2.60	1.5066	2.60	1.5035
2′	1.4039	0.00		0.00		0.00		2	1.4039	2.60	1.5245	2.60	1.5066	2.60	1.5035
2′	1.4039	0.00		0.00		0.00		3	-2.3504	0.75	1.0000	0.29	1.0000	0.31	1.0000
3′	-2.3504	0.00		0.00		0.00		3	-2.3504	0.75	1.0000	0.29	1.0000	0.31	1.0000
3′	-2.3504	0.00		0.00		0.00		4	∞	0.0875	1.6183	0.6	1.5776	1.2	1.5706
5	∞							4	∞	0.0875	1.6183	0.6	1.5776	1.2	1.5706

* di ' expression is from the displacement of di face to the d ' face.

The 2nd (0mm≤h≤1.398mm)

Asphericity coefficient

κ -6.6732E-01

A4 7.3613E-03

A6 3.0191E-03

A8 -6.2762E-04

A10 2.6178E-04

A12 4.8457E-05

A14 -1.4395E-05

A18 -3.5924E-06

A18 -1.5168E-06

A20 1.0180E-08

Path difference function (HD makes wavelength 658nm DVD:0 time DVD:1 time CD:0 time)

C2 -1.8828E-02

C4 -2.8988E-03

C6 -1.3584E-05

C8 -2.5296E-04

C10 1.3257E-05

The 2nd ' face (1.3696mm＜h)

Asphericity coefficient

κ -6.6732E-01

A4 7.3813E-03

A8 3.0191E-03

A8 -6.2762E-04

A10 2.6178E-04

A12 4.8457E-05

A14 -1.4395E-05

A16 -3.5924E-08

A18 -1.5168E-08

A20 1.0180E-08

The 3rd (0mm≤h≤0.76mm)

Asphericity coefficient

κ -2.7335E+01

A4 1.2205E-01

A6 -1.5468E-01

A8 1.1638E-01

A10 -4.2162E-02

A12 5.8170E-03

(HD makes wavelength DVD:0 time DVD:0 time CD:1 time to the path difference function: 785nm)

C2 1.1277E-01

C4 -1.8571E-01

C6 2.8084E-01

C8 -3.0947E-01

C10 1.5463E-01

The 3rd ' face (0.75mm＜h)

Asphericity coefficient

κ -2.7335E+01

A4 1.2205E-01

A6 -1.5468E-01

A8 1.1636E-01

A10 -4.2162E-02

A12 5.8170E-03

Present embodiment to thing optical element overlapping type diffraction structure of use in the 1st layer structure and the 2nd layer structure.In addition, to the optical surface of thing optical element form respectively by the formula in the coefficient substitution formula 3 shown in the table 1 is stipulated, around the axisymmetric aspheric surface of optical axis.

Formula 3

X (h) = \frac{(h^{2} / r)}{1 + \sqrt{1 - (1 + κ) {(h / r)}^{2}}} + Σ_{i = 0}^{10} A_{2 i} h^{2 i}

Here, X (h) is the axle (working direction of light just is made as) of optical axis direction, and k is the circular cone coefficient, A _2IBe asphericity coefficient, h is the height apart from optical axis.

In addition, utilize optical path length that diffraction structure provides the light beam of each wavelength by the formula in the path difference function of the coefficient substitution formula 4 shown in the table 1 is stipulated.

Formula 4

Φ (h) = λ / λ_{B} \times dor \times Σ_{i = 0}^{6} C_{2 i} h^{2 i}

λ is the wavelength of incident beam, and λ B is for making wavelength (flash of lightization wavelength), and dor is the diffraction number of times, C _2ICoefficient for the path difference function.

(embodiment 2)

Embodiment 2 be suitable for optical take-up apparatus shown in Figure 1 to the thing optical element.Table 2 illustrates the lens data of embodiment 2.Present embodiment the thing optical element is used the flash type diffraction structure in the 1st layer structure, in the 2nd layer structure, use overlapping type diffraction structure.

[table 2]

Embodiment 2 lens datas

The focal distance f of object lens ₁=2.2mm f ₂=2.29mm f ₃=2.81mm

Image planes side numerical aperture NA1:0.85 NA2:0.65 NA3:0.51

Multiplying power m1:0 m2:0 m3:0

The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)
The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)	0		∞				∞
1 (diaphragm diameter)		0.0(φ3.74mm)		0.0(φ2.88mm)		0.0(φ2.98mm)		0		∞				∞
1 (diaphragm diameter)		0.0(φ3.74mm)		0.0(φ2.88mm)		0.0(φ2.98mm)		2	1.1524	2.60	1.5245	2.60	1.5066	2.60	1.5035
2′	1.1524	0.00		0.00		0.00		2	1.1524	2.60	1.5245	2.60	1.5066	2.60	1.5035
2′	1.1524	0.00		0.00		0.00		3	-2.3408	0.75	1.0000	0.52	1.0000	0.31	1.0000
3′	-2.3408	0.00		0.00		0.00		3	-2.3408	0.75	1.0000	0.52	1.0000	0.31	1.0000
3′	-2.3408	0.00		0.00		0.00		4	∞	0.0875	1.8183	0.8	1.5778	1.2	1.5706
5	∞							4	∞	0.0875	1.8183	0.8	1.5778	1.2	1.5706

* di ' expression is from the displacement of di face to the d ' face.

The 2nd (0mm≤h≤1.433mm)

Asphericity coefficient

κ -7.6632E-01

A4 -1.5305E-02

A8 1.2685E-02

A8 -5.8253E-03

A10 5.6461E-04

A12 1.8930E-04

A14 -4.4422E-05

A16 -7.8388E-06

A18 2.2392E-06

A20 4.4683E-07

Path difference function number (HD makes wavelength 408nm DVD:6 time DVD:4 time CD:3 time)

C2 6.8377E-03

C4 -2.3350E-03

C6 8.9466E-04

C8 -5.5180E-04

C10 8.1720E-05

The 2nd ' face (1.433mm＜h)

Asphericity coefficient

κ -7.8832E-01

A4 -1.5305E-02

A8 1.2695E-02

A8 -5.8253E-03

A10 5.6481E-04

A12 1.8930E-04

A14 -4.4422E-05

A18 -7.6388E-08

A18 2.2382E-08

A20 4.4883E-07

Path difference function (HD makes wavelength 408nm DVD:3 time DVD:2 time)

C2 1.3875E-02

C4 -4.6700E-03

C8 1.7893E-03

C8 -1.1032E-03

C10 1.8344E-04

The 3rd (0mm≤h≤0.738mm)

Asphericity coefficient

κ -2.8613E+01

A4 2.0406E-01

A6 -2.5577E-01

A8 1.8888E-01

A10 -7.0583E-02

A12 1.0338E-02

Path difference function (HD makes wavelength 785nm DVD:0 time DVD:0 time CD:1 time)

C2 1.1013E-01

C4 -1.7553E-01

C6 2.4351E-01

C8 -2.3995E-01

C10 1.0637E-01

The 3rd ' face (0.736mm＜h)

Asphericity coefficient

κ -2.8813E+01

A4 2.0408E-01

A6 -2.5577E-01

A8 1.8888E-01

A10 -7.0583E-02

A12 1.0338E-02

(embodiment 3)

Embodiment 3 is identical with the formation of optical take-up apparatus shown in Figure 1, but be suitable for replacing BD and to the optical take-up apparatus of HD-DVD record and/or information reproduction to the thing optical element.Table 3 illustrates the lens data of embodiment 3.Present embodiment to thing optical element overlapping type diffraction structure of use in the 1st layer structure and the 2nd layer structure.

[table 3]

Embodiment 3 lens datas

The focal distance f of object lens ₁=2.2mm f ₂=2.00mm f ₃=1.69mm

Image planes side numerical aperture NA1:0.65 NA2:0.65 NA3:0.51

Multiplying power m1:0 m2:0 m3:0

The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)
The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)	0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ2.84mm)		0.0(φ2.84mm)		0.0(φ2.84mm)		0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ2.84mm)		0.0(φ2.84mm)		0.0(φ2.84mm)		2	1.3800	1.50	1.5245	1.50	1.5066	1.50	1.5035
2′	1.3800	0.00		0.00		0.00		2	1.3800	1.50	1.5245	1.50	1.5066	1.50	1.5035
2′	1.3800	0.00		0.00		0.00		3	-4.4079	1.01	1.0000	0.76	1.0000	0.31	1.0000
3′	-4.4079	0.00		0.00		0.00		3	-4.4079	1.01	1.0000	0.76	1.0000	0.31	1.0000
3′	-4.4079	0.00		0.00		0.00		4	∞	0.6	1.6183	0.6	1.5778	1.2	1.5708
5	∞							4	∞	0.6	1.6183	0.6	1.5778	1.2	1.5708

* di ' expression is from the displacement of di face to the d ' face.

The 2nd (0mm≤h≤1.3mm)

Asphericity coefficient

κ -6.4520E-01

A4 6.8025E-03

A6 3.0191E-03

A8 2.4474E-04

A10 -9.1138E-05

A12 1.2044E-04

A14 1.0309E-05

A16 -1.0050E-05

A18 -1.4460E-05

A20 6.5701E-06

C2 -3.3305E-02

C4 -2.8706E-03

C6 1.8429E-05

C8 -9.2718E-05

C10 8.8964E-06

The 2nd ' face (1.3mm＜h)

Asphericity coefficient

κ -6.4520E-01

A4 8.8025E-03

A6 3.0191E-03

A8 2.4474E-04

A10 -9.1138E-05

A12 1.2044E-04

A14 1.0309E-05

A16 -1.0050E-05

A18 -1.4460E-05

A20 6.5701E-06

The 3rd (0mm≤h≤0.60mm)

Asphericity coefficient

κ -3.0933E+01

A4 1.8137E-02

A6 -4.3591E-03

A8 -2.9782E-04

A10 3.3395E-04

A12 5.6412E-05

C2 -1.2153E-01

C4 4.3456E-02

C8 -2.1003E-02

C8 8.2702E-03

C10 -1.6107E-03

The 3rd ' face (0.60mm＜h)

Asphericity coefficient

κ -3.0933E+01

A4 1.9137E-02

A6 -4.3581E-03

A8 -2.9782E-04

A10 3.3395E-04

A12 5.8412E-05

(embodiment 4)

Embodiment 4 is identical with the formation of optical take-up apparatus shown in Figure 1, but be suitable for replacing BD and to the optical take-up apparatus of HD-DVD record and/or information reproduction to the thing optical element.Table 4 illustrates the lens data of embodiment 4.Present embodiment the thing optical element is used the flash type diffraction structure in the 1st layer structure, in the 2nd layer structure, use overlapping type diffraction structure.

[table 4]

Embodiment 4 lens datas

The focal distance f of object lens ₁=2.2mm f ₂=2.31mm f ₃=1.74mm

Image planes side numerical aperture NA1:0.65 NA2:0.61 NA3:0.51

Multiplying power m1:0 m2:0 m3:0

The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)
The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)	0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ2.84mm)		0.0(φ2.84mm)		0.0(φ2.84mm)		0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ2.84mm)		0.0(φ2.84mm)		0.0(φ2.84mm)		2	1.5159	1.50	1.5245	1.50	1.5066	1.50	1.5035
3	-5.7723	0.96	1.0000	1.07	1.0000	0.31	1.0000	2	1.5159	1.50	1.5245	1.50	1.5066	1.50	1.5035
3	-5.7723	0.96	1.0000	1.07	1.0000	0.31	1.0000	3′	-5.7723	0.00		0.00		0.00
4	∞	0.6	1.6183	0.8	1.5778	1.2	1.5706	3′	-5.7723	0.00		0.00		0.00
4	∞	0.6	1.6183	0.8	1.5778	1.2	1.5706	5	∞

* di ' expression is from the displacement of di face to the d ' face.

The 2nd

Asphericity coefficient

κ -6.1907E-01

A4 8.5993E-03

A6 2.7776E-03

A8 2.7481E-04

A10 -1.7620E-05

A12 1.7408E-04

A14 2.8144E-05

A16 -8.5368E-06

A18 -2.1074E-05

A20 1.1988E-05

Path difference function (HD makes wavelength 408nm DVD:2 time DVD:1 time CD:1 time)

C2 -1.3357E-02

C4 -4.0635E-04

C6 1.9526E-04

C8 -2.9677E-05

C10 3.3852E-06

The 3rd (0mm≤h≤0.60mm)

Asphericity coefficient

κ -5.8832E+01

A4 2.0756E-02

A6 -4.3165E-03

A8 3.0358E-04

A10 1.5853E-03

A12 -8.0091E-05

C2 -1.1125E-01

C4 3.4458E-02

C6 -1.6304E-02

C8 6.5328E-03

C10 -1.5883E-03

The 3rd ' face (0.80mm＜h)

Asphericity coefficient

κ -5.8832E+01

A4 2.0756E-02

A6 -4.3165E-03

A8 3.0358E-04

A10 1.5853E-03

A12 -8.0091E-05

(embodiment 5)

Embodiment 5 is identical with the formation of optical take-up apparatus shown in Figure 1, but be suitable for replacing BD and to the optical take-up apparatus of HD-DVD record and/or information reproduction to the thing optical element.Table 5 illustrates the lens data of embodiment 5.Present embodiment to thing optical element overlapping type diffraction structure of use in the 1st layer structure and the 2nd layer structure.

[table 5]

Embodiment 5 lens datas

The focal distance f of object lens ₁=2.2mm f ₂=2.00mm f ₃=1.59mm

Image planes side numerical aperture NA1:0.65 NA2:0.65 NA3:0.51

Multiplying power m1:0 m2:0 m3:0

The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)
The 1st	ri	di(408nm)	ni(408nm)	di(658nm)	ni(658nm)	di(785nm)	ni(785nm)	0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ2.84mm)		0.0(φ2.84mm)		0.0(φ2.84mm)		0		∞		∞		∞
1 (diaphragm diameter)		0.0(φ2.84mm)		0.0(φ2.84mm)		0.0(φ2.84mm)		2	1.3800	1.50	1.5245	1.50	1.5066	1.50	1.5035
2′	1.3800	0.00		0.00		0.00		2	1.3800	1.50	1.5245	1.50	1.5066	1.50	1.5035
2′	1.3800	0.00		0.00		0.00		3	-4.4079	1.01	1.0000	0.78	1.0000	0.31	1.0000
3′	-4.4079	0.00		0.00		0.00		3	-4.4079	1.01	1.0000	0.78	1.0000	0.31	1.0000
3′	-4.4079	0.00		0.00		0.00		4	∞	0.6	1.6183	0.6	1.5776	1.2	1.5706
5	∞							4	∞	0.6	1.6183	0.6	1.5776	1.2	1.5706

* di ' expression is from the displacement of di face to the d ' face.

The 2nd (0mm≤h≤1.3mm)

Asphericity coefficient

κ -6.4520E-01

A4 6.8025E-03

A6 3.0191E-03

A8 2.4474E-04

A10 -9.1138E-05

A12 1.2044E-04

A14 1.0309E-05

A16 -1.0050E-05

A18 -1.4480E-05

A20 6.5701E-08

C2 -3.3305E-02

C4 -2.6708E-03

C6 1.6429E-05

C8 -8.2718E-05

C10 8.8964E-06

The 2nd ' face (1.3mm＜h)

Asphericity coefficient

κ -6.4520E-01

A4 6.8025E-03

A6 3.0191E-03

A8 2.4474E-04

A10 -9.1138E-05

A12 1.2044E-04

A14 1.0309E-05

A16 -1.0050E-05

A18 -1.4460E-05

A20 8.5701E-08

The 3rd (0mm≤h≤0.60mm)

Asphericity coefficient

κ -3.0933E+01

A4 1.9137E-02

A6 -4.3591E-03

A8 -2.9782E-04

A10 3.3395E-04

A12 5.6412E-05

Path difference function (HD makes wavelength 785mm DVD:0 time DVD:0 time CD:1 time)

C2 -1.2153E-01

C4 4.3456E-02

C6 -2.1003E-02

C8 8.2702E-03

C10 -1.6107E-03

The 3rd (0.60mm＜h)

Asphericity coefficient

κ -3.0933E+01

A4 1.9137E-02

A6 -4.3591E-03

A8 -2.9782E-04

A10 3.3395E-04

A12 5.6412E-05

C2 -6.6094E-02

C4 2.9813E-02

C6 8.1836E-03

C8 -1.1065E-03

C10 -2.8721E-03

Claims

1, a kind of optical take-up apparatus, having the wavelength of ejaculation is the 1st light source of the 1st light beam of λ 1; Penetrating wavelength is the 2nd light source of the 2nd light beam of λ 2 (λ 2＞λ 1); Penetrating wavelength is the 3rd light source of the 3rd light beam of λ 3 (λ 3＞λ 2); And light-gathering optics; making described the 1st beam condenser is on the information recording surface of the 1st optical information recording media of t1 to protective substrate thickness; making described the 2nd beam condenser is that t2 is (on the information recording surface of the 2nd optical information recording media of t1≤t2) to protective substrate thickness; making described the 3rd beam condenser is that t3 is (on the information recording surface of the 3rd optical information recording media of t2＜t3) to protective substrate thickness; wherein by will from the light beam of described light source through described light-gathering optics optically focused to the information recording surface of described optical information recording media; carry out recording of information and/or reproduction, it is characterized in that:

Described light-gathering optics comprises:

Single element lens to the thing optical element, this to the thing optical element be by described the 1st to the 3rd optical information recording media shared to the thing optical element, have the 1st phase place structure in light source side, have the 2nd phase place structure in the optical information recording media side, and at least one face is an aspheric surface;

2, optical take-up apparatus according to claim 1 is characterized in that: described compensating element, is a temperature compensating element.

3, optical take-up apparatus according to claim 2 is characterized in that:

Described temperature compensating element moves along optical axis direction by making at least one optical element, compensates the spherical aberration that is produced by temperature variation.

4, optical take-up apparatus according to claim 2 is characterized in that:

Described temperature compensating element has the optical function face of the spherical aberration that compensation produces by temperature variation.

5, optical take-up apparatus according to claim 2 is characterized in that:

Described temperature compensating element comprises the coupled lens that the light beam from described the 1st light source is passed through.

6, optical take-up apparatus according to claim 2 is characterized in that:

Described temperature compensating element comprises to be made from described the 1st light source any two coupled lens that pass through to the light beam of described the 3rd light source at least.

7, optical take-up apparatus according to claim 2 is characterized in that:

Described temperature compensating element comprises the optical beam expander optical system.

8, optical take-up apparatus according to claim 1 is characterized in that:

Described compensating element, is Chromatically compensated element.

9, optical take-up apparatus according to claim 8 is characterized in that:

Described Chromatically compensated element moves compensate for chromatic aberration by making at least one optical element along optical axis direction.

10, optical take-up apparatus according to claim 8 is characterized in that:

Described Chromatically compensated element has the optical function face of compensate for chromatic aberration.

11, optical take-up apparatus according to claim 8 is characterized in that:

Described Chromatically compensated element comprises the coupled lens that the light beam from described the 1st light source is passed through.

12, optical take-up apparatus according to claim 8 is characterized in that:

Described Chromatically compensated element comprises to be made from described the 1st light source any two coupled lens that pass through to the light beam of described the 3rd light source at least.

13, optical take-up apparatus according to claim 8 is characterized in that:

Described Chromatically compensated element comprises the optical beam expander optical system.

14, optical take-up apparatus according to claim 1 is characterized in that:

Described the 1st phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making only is shifted the height corresponding to the hop count of this surface level quantity, and the path difference that is additional on λ 1 light beam by the section difference in each pattern of the 1st phase place structure is the integral multiple of λ 1.

15, optical take-up apparatus according to claim 1 is characterized in that:

Described the 1st phase place structure is the zigzag diffraction structure.

16, optical take-up apparatus according to claim 1 is characterized in that:

Described the 1st phase place structure is that path difference is given structure.

17, optical take-up apparatus according to claim 1 is characterized in that:

Described the 2nd phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making only is shifted the height corresponding to the hop count of this surface level quantity, and the path difference that is additional on λ 1 light beam by the section difference in each pattern of the 2nd phase place structure is the integral multiple of λ 1.

18, optical take-up apparatus according to claim 1 is characterized in that:

Described the 2nd phase place structure is the zigzag diffraction structure.

19, optical take-up apparatus according to claim 1 is characterized in that:

Described the 2nd phase place structure is that path difference is given structure.

20, optical take-up apparatus according to claim 1 is characterized in that:

Described the 1st phase place structure is that the light beam of λ 1 and light beam that wavelength is λ 3 are not brought into play diffraction effect to the wavelength of incident; wavelength to incident is the light beam performance diffraction effect of λ 2; the spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 2 of the protective substrate thickness t 1 of described the 1st optical information recording media and described the 2nd optical information recording media or by the spherical aberration that causes from the wavelength X 1 of the light beam of the 1st light source and wavelength difference from the wavelength X 2 of the light beam of the 2nd light source

Described the 2nd phase place structure is that the light beam of λ 1 and light beam that wavelength is λ 2 are not brought into play diffraction effect to the wavelength of incident; to the wavelength of incident is the light beam performance diffraction effect of λ 3, the spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 3 of the protective substrate thickness t 1 of described the 1st optical information recording media and described the 3rd optical information recording media.

21, optical take-up apparatus according to claim 20 is characterized in that:

Is under the situation of overlapping type diffraction structure at described the 1st phase place structure with described the 2nd phase place structure, and the path difference that is additional on the light beam that described wavelength is λ 1 by the section difference in the pattern of described overlapping type diffraction structure is the integral multiple of described wavelength X 1.

22, optical take-up apparatus according to claim 21 is characterized in that:

Be formed on described the 1st phase place along basic aspheric surface and construct formed surface level in each pattern of constructing with described the 2nd phase place.

23, optical take-up apparatus according to claim 22 is characterized in that:

Form the basic aspheric surface of described the 1st phase place structure and described the 2nd phase place structure; so that utilize described wavelength for the light beam of λ 1 when described thickness carries out recording of information for the protective substrate of t1 and/or reproduces on the information recording surface of described the 1st optical information recording media, spherical aberration the best.

24, optical take-up apparatus according to claim 21 is characterized in that:

Described Abbe number ν d the material 40～80 scope in of thing optical element by object lens formed, the surface level quantity in each pattern of described the 1st phase place structure is 5, and the surface level quantity in each pattern of described the 2nd phase place structure is 2.

25, optical take-up apparatus according to claim 21 is characterized in that:

Described the thing optical element is formed by the material of Abbe number ν d in 20～40 scope, the surface level quantity in each pattern of described the 1st phase place structure is 5, and the surface level quantity in each pattern of described the 2nd phase place structure is 3 or 4.

26, optical take-up apparatus according to claim 21 is characterized in that:

Described have a structure that 1st material of Abbe number ν d in 40～80 scope and 2nd material of Abbe number ν d in 20～40 scope are engaged along optical axis direction to the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, surface level quantity in each pattern of described the 1st phase place structure is 5, described the 2nd phase place structure is formed at the surface of described the 2nd material, and the surface level quantity in each pattern of the 2nd phase place structure is 3 or 4.

27, optical take-up apparatus according to claim 21 is characterized in that:

Described have a structure that 1st material of Abbe number ν d in 40～80 scope and 2nd material of Abbe number ν d in 20～40 scope are engaged along optical axis direction to the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, surface level quantity in each pattern of described the 1st phase place structure is 5, described the 2nd phase place structure is formed at the interface of described the 1st material and described the 2nd material, and the surface level quantity in each pattern of described the 2nd phase place structure is any in 3,4,5.

28, optical take-up apparatus according to claim 20 is characterized in that:

The optical surface that forms described the 1st phase place structure and described the 2nd phase place structure is divided into middle section that comprises optical axis and the neighboring area that surrounds middle section, and described the 1st phase place structure and described the 2nd phase place structure are formed in the middle section respectively.

29, optical take-up apparatus according to claim 1 is characterized in that:

Described the 1st phase place is configured in the diffraction light that produces the even number number of times when described wavelength is the light beam incident of λ 1; the spherical aberration that compensation is caused by the difference in thickness of the protective substrate thickness t 1 of described the 1st optical information recording media and the protective substrate thickness t 2 of described the 2nd optical information recording media or by the spherical aberration that causes from the wavelength X 1 of the light beam of the 1st light source and wavelength difference from the wavelength X 2 of the light beam of the 2nd light source

30, optical take-up apparatus according to claim 29 is characterized in that:

When described the 1st phase place is configured in described wavelength and is the light beam incident of λ 1, the diffraction light that one of produces number of times and be 8 times, 6 times, 2 times.

31, optical take-up apparatus according to claim 30 is characterized in that:

At described the 2nd phase place structure is under the situation of overlapping type diffraction structure, and the path difference that is additional on the light beam that described wavelength is λ 1 by the section difference in the pattern of described overlapping type diffraction structure is the integral multiple of described wavelength X 1.

32, optical take-up apparatus according to claim 31 is characterized in that:

Be formed on formed surface level in each pattern of described the 2nd phase place structure along basic aspheric surface.

33, optical take-up apparatus according to claim 31 is characterized in that:

Described Abbe number ν d the material 40～80 scope in of thing optical element by object lens formed, the surface level quantity in each pattern of described the 2nd phase place structure is 2.

34, optical take-up apparatus according to claim 31 is characterized in that:

Described Abbe number ν d the material 20～40 scope in of thing optical element by object lens formed, the surface level quantity in each pattern of described the 2nd phase place structure is 3 or 4.

35, optical take-up apparatus according to claim 31 is characterized in that:

Described have a structure that 1st material of Abbe number ν d in 40～80 scope and 2nd material of Abbe number ν d in 20～40 scope are engaged along optical axis direction to the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, described the 2nd phase place structure is formed at the surface of described the 2nd material, and the surface level quantity in each pattern of the 2nd phase place structure is 3 or 4.

36, optical take-up apparatus according to claim 31 is characterized in that:

Described have a structure that 1st material of Abbe number ν d in 40～80 scope and 2nd material of Abbe number ν d in 20～40 scope are engaged along optical axis direction to the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, described the 2nd phase place structure is formed on the interface of described the 1st material and described the 2nd material, and the interior surface level quantity of each pattern of described the 2nd phase place structure is one of 3,4,5.

37, optical take-up apparatus according to claim 29 is characterized in that:

The optical surface that forms described the 2nd phase place structure is divided into middle section that comprises optical axis and the neighboring area that surrounds middle section, and described the 2nd phase place structure is formed in the middle section.

38, optical take-up apparatus according to claim 1 is characterized in that:

39, according to the described optical take-up apparatus of claim 38, it is characterized in that:

When described the 1st phase place is configured in described wavelength and is the light beam incident of λ 1, the diffraction light that one of produces number of times and be 8 times, 6 times, 2 times,

When described the 2nd phase place is configured in described wavelength and is the light beam incident of λ 1, the diffraction light that one of produces number of times and be 9 times, 7 times, 5 times, 3 times.

40, according to the described optical take-up apparatus of claim 38, it is characterized in that:

Described Abbe number ν d the material 20～40 scope in of thing optical element by object lens formed.

41, according to the described optical take-up apparatus of claim 38, it is characterized in that:

Described have a structure that 1st material of Abbe number ν d in 40～80 scope and 2nd material of Abbe number ν d in 20～40 scope are engaged along optical axis direction to the thing optical element, described the 1st phase place structure is formed at the surface of described the 1st material, and described the 2nd phase place structure is formed at the surface of described the 2nd material.

42, optical take-up apparatus according to claim 1 is characterized in that:

Make the light beam that penetrates from described the 1st light source only form the optically focused hot spot at the information recording surface of described the 1st optical information recording media by described aspheric refraction action,

Make the light beam that penetrates from described the 2nd light source by described aspheric refraction action with based on the effect of described the 1st phase place structure, formation optically focused hot spot on the information recording surface of described the 2nd optical information recording media,

Make the light beam that penetrates from described the 3rd light source by described aspheric refraction action with based on the effect of described the 2nd phase place structure, formation optically focused hot spot on the information recording surface of described the 3rd optical information recording media.

43, optical take-up apparatus according to claim 1 is characterized in that:

Described the 1st phase place structure is that the light beam of λ 1 produces n1 time diffraction light to described wavelength, is that the light beam of λ 2 produces n2 time diffraction light to described wavelength, is the diffraction light of light beam generation n3 time of λ 3 to described wavelength,

Wherein, n1～n3, m1～m3 are natural number, and n1 ≠ n2, n1 ≠ n3, m1 ≠ m2, m1 ≠ m3.

44, optical take-up apparatus according to claim 1 is characterized in that:

Described wavelength X 1 is 380nm＜λ 1＜420nm, and described wavelength X 2 is 630nm＜λ 2＜680nm, and described wavelength X 3 is 760nm＜λ 3＜830nm.

45, optical take-up apparatus according to claim 1 is characterized in that:

The protective substrate thickness t 1 of described the 1st optical information recording media is 0.1mm or 0.6mm.

46, optical take-up apparatus according to claim 1 is characterized in that:

Temperature compensating element is set, in order to carrying out recording of information at the light beam that uses described wavelength as λ 2 and/or when reproducing on the information recording surface of described the 2nd optical information recording media, compensation is based on the spherical aberration by the described variations in refractive index that the temperature variation of thing optical element is caused.

47, optical take-up apparatus according to claim 1 is characterized in that:

Described the thing optical element is made by low melting point glass.

48, optical take-up apparatus according to claim 1 is characterized in that:

Described the thing optical element is formed from a resin.

49, optical take-up apparatus according to claim 1 is characterized in that:

Describedly make resin bed be fitted in the lens surface of glass, on the surface of described resin bed, form described the 1st phase place structure or described the 2nd phase place structure the thing optical element.

50, according to the described optical take-up apparatus of claim 48, it is characterized in that:

The particle that described resin makes diameter be less than or equal to 30nm disperses.

51, according to the described optical take-up apparatus of claim 50, it is characterized in that:

Described the thing optical element is met the following conditions: | A|＜8 * 10 ^-5

Wherein, A is the value that is expressed from the next,

[formula 1]

A = \frac{(n^{2} + 2) (n^{2} - 1)}{6 n} {(- 3 α) + \frac{1}{[R]} \frac{&PartialD; [R]}{&PartialD; t}}

α: linear expansion coefficient, [R]: molecular refraction.

52, according to the described optical take-up apparatus of claim 51, it is characterized in that:

Described the thing optical element is met the following conditions: | A|＜6 * 10 ^-5

53, according to the described optical take-up apparatus of claim 51, it is characterized in that:

Described the thing optical element is met the following conditions: 0＜A＜8 * 10 ^-4

54, according to the described optical take-up apparatus of claim 50, it is characterized in that:

Described particle is an inorganic material.

55, according to the described optical take-up apparatus of claim 54, it is characterized in that:

Described inorganic material is an oxide.

56, according to the described optical take-up apparatus of claim 55, it is characterized in that:

Described oxide is the saturated state of oxidation.

57, according to the described optical take-up apparatus of claim 50, it is characterized in that:

In described resin, add antioxidant.

58, according to the described optical take-up apparatus of claim 50, it is characterized in that:

The volume ratio of described resin and described particle is 9: 1 or 3: 2.

59; a kind of optical take-up apparatus to the thing optical element; by the 1st light beam that makes the 1st wavelength X 1 that penetrates from the 1st light source is that the information recording surface of the 1st optical information recording media of t1 forms the optically focused hot spot at protective substrate thickness; carry out the reproduction and/or the record of information; the 2nd light beam by making the 2nd wavelength X 2 (λ 1＜λ 2) that penetrates from the 2nd light source is that (information recording surface of the 2nd optical information recording media of t1≤t2) forms the optically focused hot spot to t2 at protective substrate thickness; carry out the reproduction and/or the record of information; the 3rd light beam by making the 3rd wavelength X 3 (λ 2＜λ 3) that penetrates from the 3rd light source is that (information recording surface of the 3rd optical information recording media of t2＜t3) forms the optically focused hot spot to t3 at protective substrate thickness; carry out the reproduction and/or the record of information, it is characterized in that:

Described to the thing optical element be for described the 1st to the 3rd optical information recording media common use to the thing optical element, be have the 1st phase place structure and two phase places of the 2nd phase place structure are constructed and at least one face be aspheric 1 group of structure to the thing optical element

The light utilization ratio of the arbitrary light beam of described the 1st light beam to described the 3rd light beam is less than or equal to 50%.

60, described according to claim 59 to the thing optical element, it is characterized in that:

It is described the 3rd light beam that described smooth utilization ratio is less than or equal to 50% light beam, and the light utilization ratio of described the 1st light beam and described the 2nd light beam is all more than or equal to 75%.

61, described according to claim 59 to the thing optical element, it is characterized in that:

Described the 1st phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making only is shifted the height corresponding to the hop count of this surface level quantity, and this overlapping type diffraction structure has the wavelength selectivity that does not make described the 1st light beam and described the 3rd light beam generation diffraction and make the diffraction of described the 2nd light beam generation diffraction.

62, described according to claim 61 to the thing optical element, it is characterized in that:

The path difference that is additional on described the 1st light beam by a section difference of described overlapping type diffraction structure is 2 * λ 1.

63, described according to claim 62 to the thing optical element, it is characterized in that:

The surface level number of described regulation is 5.

64, described according to claim 59 to the thing optical element, it is characterized in that:

Described the 1st phase place structure is the zigzag diffraction structure, establishing the diffraction number of times with the maximum diffraction light quantity in the diffraction light that is produced when described the 1st light beam incides described sawtooth diffraction structure is dor1, diffraction number of times with the maximum diffraction light quantity in the diffraction light that is produced when described the 2nd light beam incides described sawtooth diffraction structure is dor2, when the diffraction number of times with the maximum diffraction light quantity in the diffraction light that is produced when described the 3rd light beam incides described sawtooth diffraction structure is dor3, when satisfying following formula, describedly make described dor1 the diffraction light optically focused of described the 1st light beam to the information recording surface of described the 1st optical information recording media to the thing optical element, described dor2 the diffraction light optically focused that makes described the 2nd light beam is to the information recording surface of described the 2nd optical information recording media, described dor3 the diffraction light optically focused that makes described the 3rd light beam is to the information recording surface of described the 3rd optical information recording media

Dor1＞dor2 〉=dor3, wherein, dor1 is an even number.

65, described according to claim 64 to the thing optical element, it is characterized in that:

Described diffraction number of times dor1 is 2, and described diffraction number of times dor2 is 1, and described diffraction number of times dor3 is 1.

66, described according to claim 59 to the thing optical element, it is characterized in that:

Described the 2nd phase place structure is overlapping type diffraction structure, the cross sectional shape that this overlapping type diffraction structure will comprise optical axis is that stair-stepping arranged in patterns becomes concentric circles, and surface level number by each regulation, the section of making only is shifted the height corresponding to the hop count of this surface level quantity, and this overlapping type diffraction structure has the wavelength selectivity that does not make described the 1st light beam and described the 2nd light beam generation diffraction and make the diffraction of described the 3rd light beam generation diffraction.

67, described according to claim 66 to the thing optical element, it is characterized in that:

The path difference that is additional on described the 1st light beam by a section difference of described overlapping type diffraction structure is 5 * λ 1.

68, described according to claim 67 to the thing optical element, it is characterized in that:

The surface level number of described regulation is 2.

69, described according to claim 68 to the thing optical element, it is characterized in that:

Incide under the situation of described overlapping type diffraction structure at described the 3rd light beam, its light quantity is assigned to two diffraction lights basically, described to the thing optical element make in described two diffraction lights, the focal position away from a described side's to the thing optical element diffraction light optically focused to the information recording surface of described the 3rd optical information recording media.

70, described according to claim 59 to the thing optical element, it is characterized in that:

Described the 2nd phase place structure is the zigzag diffraction structure, establishing the diffraction number of times with the maximum diffraction light quantity in the diffraction light that is produced when described the 1st light beam incides described sawtooth diffraction structure is dor1 ', diffraction number of times with the maximum diffraction light quantity in the diffraction light that is produced when described the 2nd light beam incides described sawtooth diffraction structure is dor2 ', when the diffraction number of times with the maximum diffraction light quantity in the diffraction light that is produced when described the 3rd light beam incides described sawtooth diffraction structure is dor3 ', when satisfying following formula, describedly make the inferior diffraction light optically focused of described dor1 ' of described the 1st light beam to the information recording surface of described the 1st optical information recording media to the thing optical element, the inferior diffraction light optically focused of described dor2 ' that makes described the 2nd light beam is to the information recording surface of described the 2nd optical information recording media, the inferior diffraction light optically focused of described dor3 ' that makes described the 3rd light beam is to the information recording surface of described the 3rd optical information recording media

Dor1 '＞dor2 ' 〉=dor3 ', wherein, dor1 ' is an odd number.

71, described according to claim 70 to the thing optical element, it is characterized in that:

Described diffraction number of times dor1 ' is 3, and described diffraction number of times dor2 ' is 2, and described diffraction number of times dor3 ' is 2.

72, described according to claim 59 to the thing optical element, it is characterized in that:

Described the 1st phase place structure is formed on the optical surface of light source side, and described the 2nd phase place structure is formed on the optical surface of optical information recording media side.

73, described according to claim 59 to the thing optical element, it is characterized in that:

Be m1, be m2, when being m3, meet the following conditions establishing design multiplying power at described the 1st wavelength at the design multiplying power of described the 3rd wavelength at the design multiplying power of described the 2nd wavelength,

m1＝m2＝0

-0.15≤m3≤0。

74, described according to claim 59 to the thing optical element, it is characterized in that:

The low melting point glass that is less than or equal to 400 degree by tr pt Tg is made.

75, described according to claim 59 to the thing optical element, it is characterized in that:

Be formed from a resin.

76, described according to claim 59 to the thing optical element, it is characterized in that:

Resin bed is fitted on the lens surface of glass, on the surface of described resin bed, forms described the 1st phase place structure or described the 2nd phase place structure.

77, described according to claim 75 to the thing optical element, it is characterized in that:

Follow the symbol of variations in refractive index rate of temperature variation opposite with described resin, the particle that makes diameter be less than or equal to 30nm is distributed in the described resin.