Abstract:
An optical pickup device comprising an object optical system for focusing a first light beam of a first wavelength lambda1 onto an information recording surface of a first optical disk of a recording density rho1, focusing a second light beam of a second wavelength lambda2 (lambda2>lambda1) onto an information recording surface of a second optical disk of a recording density rho2 (rho2 lambda2) onto an information recording surface of a third optical disk of a recording density rho3 (rho3
Abstract:
An image pickup device includes: a base board provided with an image sensor; an outer frame member fixed on the base board for shielding at least the image sensor; an optical member having a lens portion that forms an image of an object on a light-receiving surface of the image sensor and an outer form that supports the lens portion and is fitted in the outer frame member; a pressing member for urging the optical member in a direction of an optical axis of the lens portion with prescribed pressing force, to bring the optical member into contact with the base board or with the image sensor; and a rotation-preventing mechanism provided on an interfitting part where the optical member is fitted in the outer frame member for preventing rotation of the optical member around the optical axis.
Abstract:
An optical pickup device wherein at least a high density disc such as HD-DVD is compatible with DVD, and securing an amount of light is compatible with correction of chromatic aberration. And a correcting element representing an optical system used for the aforementioned optical pickup device.
Abstract:
An objective lens for use in an optical pickup apparatus has a diffractive optical surface. A first light flux having a first wavelength of »1 is converged as a first number diffraction order diffracted-ray other than the zero-th order diffracted-ray onto an information recording plane of the first optical information recording medium having a thinner protective substrate t1 by the diffractive optical surface and a second light flux having a second wavelength of »2 (»1
Abstract:
An optical system (1,2) has an optical functional surface including a common region (A) used for conducting information recording and/or reproducing for both of a first optical information recording medium and a second optical information recording medium. The common region (A) comprises a refractive surface (A,1) of an imaginary basic aspherical surface and an optical path difference providing structure (A,2) in which plural ring-shapes zones are separated around the center of an optical axis and neighboring ring-shaped zones are displaced to each other in a direction of an optical axis so as to cause an optical path difference obtained by multiplying a predetermined wavelength lambda s ( lambda 1
Abstract:
An image pickup device includes: a base board provided with an image sensor; an outer frame member fixed on the base board for shielding at least the image sensor; an optical member having a lens portion that forms an image of an object on a light-receiving surface of the image sensor and an outer form that supports the lens portion and is fitted in the outer frame member; a pressing member for urging the optical member in a direction of an optical axis of the lens portion with prescribed pressing force, to bring the optical member into contact with the base board or with the image sensor; and a rotation-preventing mechanism provided on an interfitting part where the optical member is fitted in the outer frame member for preventing rotation of the optical member around the optical axis.
Abstract:
Disclosed is an optical element for optical pickup devices which is obtained by shaping a resin material wherein inorganic particles having a diameter of 30 nm or less are dispersed in a plastic resin. Also disclosed are an optical pickup device using such an optical element and a method for producing such an optical element.