Blu-ray光盘读取头的光学系统与透镜设计优化

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本文主要探讨了在蓝光光盘（Blu-ray Disc, BD）光学头（Optical Pick-up, OPU）设计过程中，光学系统与关键镜头（如准直镜、整形棱镜和柱面镜）的重要性。作者针对BD OPU设计了一套光学系统，主要包括： 1. **准直镜（Collimator Lens）**：采用三元组透镜来实现激光束的准直，这是确保光路清晰和光束稳定性的重要环节。准直镜的作用是将发散的激光光束转换成平行光束，以便于聚焦和传输。 2. **激光整形棱镜（Beam Shaping Lens）**：为了优化激光在BD上的读取效果，设计了一个专门用于激光束整形的透镜。这有助于减少光斑的大小和形状不规则性，从而提高数据读取的精度和速度。 3. **信号检测柱面镜（Cylinder Lens for Signal Detection）**：该镜片用于聚焦接收从BD反射回来的信号光，通过柱面形状的特性，可以有效地分离和解析出数据信号，进行错误检测和校正。在整个设计过程中，作者还特别强调了组装工装（assembly jigs）的制作，这些工装确保了每一块透镜都能精确地安装到OPU的基础结构中，防止因为安装误差导致的光学性能下降。此外，文章指出在当前全球光学存储市场中，CD、CD-ROM、DVD-ROM、DVD-RW、DVD+RW等产品广泛应用的同时，蓝光光盘因其更高的存储密度和数据保护能力而备受关注。因此，对BD OPU的光学系统设计优化显得尤为重要，它直接影响到读取速度、图像质量以及数据安全性。论文的研究成果包括实际得到的阅读点像和S曲线照片，这些是验证设计效果的关键指标，可用于BD的读取操作。本文涉及的主要光学工程领域编码为：210.0210（光学系统设计）、220.0220（光路设计）、230.0230（光学元件应用）。本文对于蓝光光盘技术的发展和提高数据存储设备的性能具有实际意义。

426 CHINESE OPTICS LETTERS / Vol. 6, No. 6 / June 10, 2008

Optical system and lens design for

Blu-ray disc optical pick-up

Lihua Li (

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), Longfa Pan (

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), and Jianshe Ma (

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Optical Memory National Engineering Research Center, Department of Precision Instrument and Mechanology,

Tsinghua University, Beijing 100084

Received Septemb er 21, 2007

During the design process of Blu-ray disc optical pick-up (BD OPU), the optical system and the collimator

lens design is especially important. This paper d esigns an optical system and some lenses for the BD OPU,

including collimator lens, beam shaping lens for laser b eam shaping, and cylinder lens for signal detecting.

In this OPU , we use a triplet lens to collimate the laser beam. At th e same time, we build a series of

assembly jigs to make sure that each lens can be put into the OPU basement properly. At last, we get the

reading spot image and S-curve photo of OPU, which can be used to read Blu-ray disc (BD).

OCIS codes: 210.0210, 220.0220, 230.0230.

In the global market of the optical data storage, CD, CD-

ROM, DVD-ROM, DVD-RW, DVD+RW and so on are

widely used. Although compared with CD, current DVD

already has considerable progress in storage density and

read-write speed, the enhanced step is still restricted by

the red laser, which spurs the requirement of new gener-

ation of blu-ray technology. The new technology uses the

blue ray laser wave band to carry on the work, and the

storage capacity may increase nearly 5 times or more,

causing a technological breakthrough of high density of

optical data storage

[1−3]

. Table 1 introduces the format

for Blu-ray disc (BD) with single layer.

In this paper, according to the format for BD with

single layer, we build up a commercial optical system

for the Blu-ray disc optical pick-up (BD OPU) and the

ray-path with optical elements is shown in Fig. 1.

As the selected laser diode (LD) does not have the

feedback function, we need to build a special optical part

for LD power control. Therefore, BD OPU optical sys-

tem should be composed of the following three partial

optical ray paths: collimating, beam shaping and laser

power controlling. Table 2 gives the basic parameters of

Table 1. Format for BD with Single Layer

Capacity 23.3/25/27 GB (Single Layer)

Wavelength of the Laser 405 nm

NA of the Objective Lens 0.85

Data Transfer Rate 36 Mbps

Diameter of the Disc 120 mm

Thickness of th e Disc 1.2 mm

Diameter of the Center Hole 15 mm

Recording Method Phase Change

Signal Modulation 1 − 7PP

Data Track Groove Recording

Addressing Method Wobble

Visual Data MPEG-2 Video

Audio Data AC3, MPEG-1, Layer2, Others

AV Multiplex Method MPEG-2 Transport Stream

SONY LD whose grade is SLD3233VF-53

[4]

From Table 2, the parallel and perpendicular radia-

tion angles can be obtained. These decide the numerical

aperture (NA) of collimator lens.

In the collimation path of rays, we mainly designed the

triplet lens to avoid using asphere lens, because the cost

of asphere lens is much higher than triplet lens with the

same performance. In the asphere lens market, although

there are many types of ready-made products, special

lens for our LD is few and not suitable for this system.

Therefore we designed the collimator lens according to

the theoretically requirements for the LD radiation angle

and objective lens.

In BD OPU system, the basic requirement for objective

lens which is written in Blu-ray disc read-only format

[5]

is that NA should be 0.85. The first objective lens with a

NA of 0.8 was developed using a two-element lens to in-

crease the fabrication tolerance in 1997

[6]

. Then in order

to correct chromatic aberration caused by mode hopping

and wavelength change of the laser diode, a three-element

objective lens with NA of 0.85 at 405 nm was proposed

in 2002

[7]

. Almost at the same time, the first single

objective lens that has the NA of 0.85 was developed

in Victor Company of Japan, Ltd. (JVC)

[8]

. Then

in 2003, JVC published the design principle for single

Fig. 1. Ray-path in BD OPU and optical components.

1671-7694/2008/060426-05

 2008 Chinese Optics Letters

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