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	Objective lens and optical pickup device
	TATEYAMA KIYONO
	2013-04-04
著作权人	KONICA MINOLTA, INC.
专利号	WO2013047202A1
国家	世界知识产权组织
文献子类	发明申请
其他题名	Objective lens and optical pickup device
英文摘要	Provided are an objective lens and an optical pickup device that are used for recording on/playback from an optical disk having at least three information recording surfaces, said objective lens and optical pickup device being capable of effectively inhibiting crosstalk between layers even if said objective lens and optical pickup device are provided with a diffraction structure having a temperature characteristic correction function. The objective lens (OBJ) is a plastic single-element lens with an image-side numerical aperture (NA) of at least 0.8 and less than 0.90, and is designed such that spherical aberration is corrected at design substrate thickness (t) [mm] (where t1 ≤ t ≤ t2) and magnification = 0. For the objective lens (OBJ), the change in third-order spherical aberration per unit wavelength (ΔSA3W) [λrms/nm] in response to a change in light source wavelength, multiplied by the change in third-order spherical aberration per unit temperature (ΔSA3T) [λrms/°C] in response to a change in environmental temperature, is negative (< 0). The objective lens (OBJ) has a diffraction structure. A main diffraction beam is generated when a beam of light from a semiconductor laser (LD) is input to the diffraction structure. By condensing said main diffraction beam on one of the information recording surfaces (RL1 to RL3), the objective lens (OBJ) starts recording and/or playback of information, with the steps of the diffraction structure oriented in the light axis direction.
公开日期	2013-04-04
申请日期	2012-09-12
状态	未确认
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58801]
专题	半导体激光器专利数据库
作者单位	KONICA MINOLTA, INC.
推荐引用方式 GB/T 7714	TATEYAMA KIYONO. Objective lens and optical pickup device. WO2013047202A1. 2013-04-04.

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