CN101042461A

CN101042461A - Compound lens

Info

Publication number: CN101042461A
Application number: CN 200610034658
Authority: CN
Inventors: 张仁淙
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2006-03-23
Filing date: 2006-03-23
Publication date: 2007-09-26

Abstract

This invention relates to one lens combination, which comprises first and second lens, wherein, the first lens comprises one first side composed of first plane and its connected first concave surface, wherein, the second lens comprises second side sticking to the second side; the first concave surface and second side form one sealed chamber; the chamber is set with third lens; the third lens has different reflection rates from first and second lens.

Description

Compound lens

[technical field]

The present invention relates to a kind of compound lens, relate in particular to a kind of bifocal compound lens that has.

[background technology]

DVD (Digital Versatile Disc) has obtained consumer's popular welcome now owing to have the capacity that is equivalent to 7 times of CD (Compact Disc).But current because CD class CD is used widely and is had the mass data resource, therefore DVD and CD class CD will exist jointly in considerable time, so the player of DVD and driver are necessary to read CD disc and DVD disc simultaneously.

According to dvd standard, the dish base thickness of DVD disc is 0.6mm, and the dish base thickness of traditional C D disc is 1.2mm.Because DVD and CD dish coil on basic thickness and the storage density and there are differences, the two compatibility is read certain problem of having brought.Therefore the DVD driver except that the demoder that should have CD, must be considered the requirement of reading existing CD CD if will read the CD CD when design dvd pickup head.In order to solve the compatibling problem of optical head, different manufacturers has taked different schemes in the design of dvd pickup head.

Wherein a kind of scheme adopts holographic objective system exactly.The holographic lens system has bifocus, its object lens be one with the integrated aspheric surface moulded glass lens of hologram, hologram is in the center of laser beam.Hologram produces filtration to the light of process, and diffraction can take place part light, and does not change direction, the final hot spot that reads the CD signal that forms; Do not formed the hot spot that reads the DVD signal by that part of light beam of hologram diffraction.The hologram complex structure that a shortcoming of holographic objective system is exactly holographic object lens, difficulty of processing is big, and mould is difficult to make.

[summary of the invention]

In view of this, be necessary to provide a kind of bifocus compound lens simple in structure.

A kind of compound lens, it comprises first lens and second lens, described first lens comprise one first side, comprise first plane and the first coupled concave surface on the described side, described second lens comprise second side, and described second side is close on described first plane, thereby described first concave surface and second side form the cavity of a sealing, be provided with the 3rd lens in the described cavity, described the 3rd lens have and described first lens and the different refractive index of second lens.

When light passed through in the described compound lens, a light was only through first lens and second lens, and a part of light can be through the 3rd lens of first lens, second lens and index-matching oil or transparent resin composition.First lens and second combination of lenses can have a focus, and first lens, second lens and the 3rd combination of lenses can have another focus, so the compound lens of present embodiment has bifocus and simple in structure.

[description of drawings]

Fig. 1 is the compound lens synoptic diagram of first embodiment of the invention.

Fig. 2 is the compound lens decomposing schematic representation of first embodiment of the invention.

Fig. 3 is the compound lens synoptic diagram of second embodiment of the invention.

Fig. 4 is the compound lens synoptic diagram of third embodiment of the invention.

Fig. 5 is the compound lens synoptic diagram of fourth embodiment of the invention.

Fig. 6 is the compound lens synoptic diagram of fifth embodiment of the invention.

Fig. 7 is Fig. 6 VII-VII sectional view along the line.

[embodiment]

Consult Fig. 1 and Fig. 2, the compound lens 10 of present embodiment comprises first lens 11 and second lens 12.First lens 11 comprise that 113, the first sides 113, first side comprise first plane 111 and the first coupled concave surface 112.Second lens 12 comprise second side 123.First plane 111 is close on second side 123, and first concave surface 112 and second side 123 surround a cavity 14.Be provided with the 3rd lens 13, the three lens 13 in the cavity 14 and can be plastic cement or glass lens or constitute, but its refractive index is different with first lens 11 and second lens 12 by index-matching oil or transparent resin.

First lens 11 and second lens 12 can be plastic cement lens or glass lens, plastic material comprises optics polycarbonate (Polycarbonate, PC), optics polymethylmethacrylate (PolymethylMethacrylate, PMMA), poly-cyclic olefin polymer (Cyclo-Olefin Polymer, COB) or poly-cyclic olefine copolymer (Cyclo-Olefin Copolymers).It can be made by model technology.First concave surface 112 can have different shapes according to different optical designs, as sphere or aspheric surface.Index-matching oil can be polyimide.Resin can be silicones.

Preferably, form a coupling plated film 114 between the 3rd lens 13 and first lens 11 and second lens 12, it is used to reduce the total reflection between the 3rd lens 13 and first lens 11 and second lens 12.Improve the image quality of compound lens 10.Coupling plated film 114 can be rete or its combination of magnesium oxide, titania, tantalum pentoxide, silicon dioxide.

When light through in the compound lens of present embodiment the time because the 3rd lens 13 diameters are less, therefore a light is only through first lens 11 and second lens 12, and a part of light can be through first lens 11, second lens 12 and the 3rd lens 13.

First lens

11 and 12 combinations of second lens can have a focus, and first lens 11,

second lens

12 and 13 combinations of the 3rd lens can have another focus, so the compound lens of present embodiment has bifocus.The adjustable size that changes the 3rd lens 13 saves relative spot intensity on two focuses.

Consult Fig. 3, the compound lens 20 of second embodiment is similar to the compound lens 10 of first embodiment, difference is to comprise on second side 223 of second lens 22 second plane 221 and second concave surface, 222, the second concave surfaces 222 and first concave surface, the 212 common cavitys 23 that form.Be filled with index-matching oil or transparent resin in the cavity 23.

Consult Fig. 4, the 3rd to execute the compound lens 30 of example similar to the compound lens 10 of first embodiment, and difference is be formed with a runner 34 that is connected with cavity 33 on first lens 31, second lens 32 or between first lens 31 and second lens 32.Runner 34 is used for charging into index-matching oil or transparent resin in cavity 33.

Consult Fig. 5, the 4th to execute the compound lens 40 of example similar to the compound lens 10 of first embodiment, and difference is to be formed with two runners 44 that are connected with cavity 43 between first lens 41, second lens 42 or first lens 41 and second lens 42.Described two runners 44 have identical axis.One of described two runner are used to inject index-matching oil or transparent resin, and another is used to take out index-matching oil or transparent resin.

Consult Fig. 6, the 5th execute the example compound lens 50 similar to the compound lens 40 of the 4th embodiment, consult Fig. 7, difference be first concave surface 512 for circular, second concave surface 522 similarly, thereby first concave surface 512 and second concave surface, the 522 common circular cavitys 53 that form are filled with index-matching oil or transparent resin in the cavity 53.

In addition, those skilled in the art also can do other variation in spirit of the present invention.Certainly, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.

Claims

1. compound lens, it comprises first lens and second lens, described first lens comprise one first side, comprise first plane and the first coupled concave surface on described first side, described second lens comprise second side, and described second side is close on described first plane, thereby described first concave surface and second side form the cavity of a sealing, be provided with the 3rd lens in the described cavity, described the 3rd lens have and described first lens and the different refractive index of second lens.

2. compound lens as claimed in claim 1 is characterized in that comprising on described second side second concave surface relative with described first concave surface, the described cavity of the common formation of described first concave surface and described second concave surface.

3. compound lens as claimed in claim 1, its thing are levied and are that described the 3rd lens are made of the index-matching oil or the transparent resin that are filled in the described cavity.

4. compound lens as claimed in claim 3 is characterized in that described index-matching oil comprises polyimide.

5. compound lens as claimed in claim 3 is characterized in that described resin comprises silicones.

6. as claim 2 or 3 described compound lenss, it is characterized in that on described first lens, second lens or be formed with the runner that at least one and described cavity is connected between it.

7. as claim 2 or 3 described compound lenss, it is characterized in that on described first lens, second lens or be formed with two runners that are connected with described cavity between it.

8. compound lens as claimed in claim 1 is characterized in that described concave surface is circular.

9. compound lens as claimed in claim 1 is characterized in that being formed with the coupling plated film between described the 3rd lens and described first lens and described second lens, and it comprises magnesium oxide, titania, tantalum pentoxide, silica coating or its combination.

10. compound lens as claimed in claim 1 is characterized in that described first lens and second lens are plastic cement lens or glass lens.