摘要:
A disclosed objective lens includes: a lens having an entrance surface and an emission surface; and an anti-reflection coat formed on the emission surface, wherein a transmittance T1—0 [%] of the anti-reflection coat when an incident angle of a first laser beam having a first wavelength λ1 (390 nm≦λ1≦430 nm) is 0°, and the transmittance T1—40 [%] of the anti-reflection coat when the incident angle of the first laser beam is 40° satisfy 0.95≦T1—0/T1—40≦1.05, and a transmittance T2—0 [%] of the anti-reflection coat when an incident angle of a second laser beam having a second wavelength λ2 (630 nm≦λ2≦680 nm) is 0° and a transmittance T2—40 [%] of the anti-reflection coat when the incident angle of the second laser beam is 40° satisfy 0.85≦T2—0/T2—40≦0.97.
摘要:
A scan unit according to the present invention is a scan unit including: a reflecting portion for reflecting laser light; and an enclosure portion having a movable object enclosed within a hollow, characterized in that the movable object moves in accordance with an angular velocity of the scan unit, thereby changing a reflecting state of the reflecting portion with respect to the laser light. In one embodiment, the movable object moves in accordance with the angular velocity of the scan unit to cover at least a part of the reflecting portion. In one embodiment, the movable object moves in accordance with the angular velocity of the scan unit to deform the reflecting portion.
摘要:
A micro-mechanical structure system according to the present invention includes: a movable structure 5, at least a portion of the movable structure 5 being formed of a single-crystalline material; an elastic supporting member 10 for supporting the movable structure 5; a stationary electrode section 13, 25 at least partially opposing the movable structure 5; and a base 22 which has a circuit section and to which the stationary electrode 13, 25 is affixed. The stationary electrode section 13, 25 includes a first electrode layer (upper stationary electrode layer) 13 positioned relative to the movable structure 5 and a second electrode layer (lower stationary electrode layer) 25 positioned relative to the base 22, the first electrode layer 13 and the second electrode layer 25 being bonded to each other via adhesion layers 15 and 16.
摘要:
An actuator according to the present invention includes: a base 1; a movable section 7 capable of displacement relative to the base 1; elastic supporting members 13a to 13c for supporting the movable section 7 so as to allow the movable section 7 to make a displacement relative to the base 1; and a plurality of driving sections 6a to 6c for causing the movable section 7 to be displaced relative to the base 1. The plurality of driving sections 6a to 6c respectively include driving force transmitting sections 10a to 10c which come in contact with the movable section when transmitting driving force to the movable section 7.
摘要:
An objective lens, an optical head, an optical disk apparatus and an information processing apparatus which can suppress deterioration of a focal spot caused by a drop in the diffraction efficiency. Inner and outer circumference areas converge a laser beam, out of laser beams having a wavelength λ1 which are diffracted by the inner and outer circumference areas, on a first information recording medium; the inner circumference area and a mid-circumference area converge a laser beam, out of the laser beams having a wavelength λ2 which are diffracted by the inner circumference area and the mid-circumference area, on a second information recording medium; and the diffraction efficiency of the laser beam having the wavelength λ2 is greater than the diffraction efficiency of the laser beam having the wavelength λ1.
摘要:
To provide an optical pickup and an optical information device, capable of obtaining excellent signal characteristics for an optical disk on and/or from which recording and/or reproducing are performed using a laser. The optical pickup includes an optical detector, a support holder for holding the optical detector, and an optical base for fixing the support holder. The support holder has at least two notches at its both ends, the optical base has convex portions corresponding to the notches of the support holder, the optical base and the support holder are fixed by photo-curable adhesives for bonding the convex portions and the support holder to each other, and the shortest distance between the side faces of the convex portions, which do not face each other, is equal to or less than the width of the support holder in the direction of right and left ends.
摘要:
An image projector according to the present invention includes a first light source that emits visible light and a second light source that emits invisible light and projects the visible light and the invisible light onto a screen. The screen includes a material, at least one of the visible light reflectance, transmittance and absorbance of which changes when irradiated with the invisible light projected. The image projector further includes a modulating section for modulating the intensities of the visible light and invisible light based on an image signal and a control section for controlling the modulating section.
摘要:
An optical disk apparatus according to the present invention includes: a light emission section for emitting laser light; an optical system for irradiating the optical disk medium with the laser light; and an aberration control section for controlling aberration of the laser light. In one embodiment, the aberration control section repeatedly switches between a plurality of aberration setting states in a focus lock-in operation. In another embodiment, the aberration control section simultaneously sets a plurality of aberration setting states in a focus lock-in operation. As a result, a plurality of aberration setting states can be allowed to substantially coexist within a single optical system.
摘要:
The present invention provides an optical information medium capable of suppressing the influence of reflection light from an unnecessary information recording face and effectively eliminating spherical aberration at the time of recording/reproducing information to/from a recording medium having a plurality of information recording faces. When reflectance of an information recording face is αh and transmittance between information recording faces is th, ah and th of the optical information medium are set so as to satisfy ((α(h−1)2×α(h−2))/(th2×αh))
摘要:
A motor controlling device includes an acceleration detector for detecting an acceleration of a motor; a motor driver for supplying a driving current to the motor; a heat quantity calculator for calculating a heat quantity generated in the motor at least based on an output from the acceleration detector; and a motor controller for controlling the motor driver based on the heat quantity.