Abstract:
An automatic focusing method includes the following steps: providing a digital camera module, which includes a lens member, an image sensor member, a distance-measuring member, a signal-processing member, a drive control member, and a drive member; measuring an object distance using the distance-measuring member, and transmitting the object distance to the signal-processing member for generating a control signal; the drive control member driving the drive member according to the control signal; and the drive member driving the image sensor member or the lens member to a position determined by the control signal. The step of providing the digital camera module includes: providing the lens member, the image sensor member and the distance-measuring member; measuring a depth of focus of the lens member; establishing a range of error of movement of the drive member; and selecting a suitable signal-processing member, drive control member, and drive member.
Abstract:
An optical pickup device compatible with two types of optical recording media in accordance with the present invention includes: a first light source emitting a first laser beam with a first wavelength; a second light source emitting a second laser beam with a second wavelength greater than the first wavelength; an objective lens with parameters according with the first wavelength and adapted to focus the first and second laser beams on the at least two types of optical recording media; a collimating lens for collimating an incident beam of light and transmitting the collimated light beam to the objective lens; an optical path synthesizer/separator for receiving the first and second laser beams and transmitting the first and second laser beams to the collimating lens; and a compensator for correcting the second laser beams and transmitting the corrected second laser beams to the optical path synthesizer/separator.
Abstract:
An optical pickup head compatible with multiple optical recording media includes three light sources, a prism unit disposed beside the light sources, a reflective multi-surface prism disposed beside the prism unit for multiple reflecting light beams therethrough, a collimating lens disposed beside the reflective multi-surface prism for collimating light beams there through, and an objective lens. The prism unit includes a first portion facing the first light source for passing the first light beam therethrough, a second portion facing the second light source for passing the second light beam therethrough, a third portion facing the third light source for passing the third light beam therethrough, a first aspherical surface for correcting aberrations of the first light beam caused by non-matching, and a second aspherical surface for correcting aberrations of the second light beam caused by non-matching.
Abstract:
A hybrid lens system includes: a first lens with positive diffractive power, a second lens with negative diffractive power, a third lens with positive diffractive power, and a fourth lens with negative diffractive power. The first lens, the second lens, the third lens and the fourth lens are aligned in that order from an object side to an image side. The first lens is made from a glass material, each of the second lens, the third lens and the fourth lens is made from a plastic material. All of the four lenses are aspheric lenses.
Abstract:
An object lens (10) includes a housing (107) having an inner layer, an electrically conductive liquid (103) having an electro-wetting effect with respect to the inner layer (102) of the housing, and an electrically insulating liquid (105) adjacent the electrically conductive liquid. The electrically conductive liquid and the electrically insulating liquid are hermetically contained in the housing and form two layers along a central axis of the housing. The electrically conductive liquid is capable of changing its form when a voltage is applied to the electrically conductive layer whereby the object lens has a second numerical aperture. The second numerical aperture is different from an original first numerical aperture of the object lens when there is no voltage applied to the electrically conductive layer. An optical pickup device using an object lens and compatible with plural optical recording mediums is also provided.
Abstract:
An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a first lens (22), a second lens (23), and a third lens (24). The light source is adapted for providing an elliptical light beam defining different diverging angles in different directions, wherein any cross-section of the elliptical light beam emitted from the light source defines a long axis and a short axis which are perpendicular to each other. The first lens, the second lens, and the third lens are used for reconfiguring the elliptical light beam, thus obtaining a round light beam having equivalent short axis and long axis, and equivalent diverging angles in both horizontal direction and vertical direction. Optical centers of the first lens, the second lens, and the third lens commonly define a common optical axis along which the elliptical light beams travels.
Abstract:
A hybrid lens system includes, in order from an object side to an image side: a first positive lens, a second negative lens, and a third positive lens. The first lens is made of glass material. The second and second lenses are both made of plastic material and respectively have two aspheric surfaces. The hybrid lens system is capable of resisting scraping and providing high imaging quality.
Abstract:
An optical pickup head (100) for a high density recording and/or reproducing device compatible with first and second optical recording media. The pickup head includes a first light source (11) emitting first light beams with a first wavelength, a second light source (12) emitting second light beams with a second wavelength greater than the first wavelength, a prism unit (3), a collimating lens (4) located beside the prism unit for collimating incident first and second light beams, and an objective lens (7) for receiving the first and second light beams and transmitting the first and second laser beams to the first and second recording media respectively. The prism unit includes a first portion facing the first light source and receiving the first light beams, a second portion facing the second light source and receiving the second light beams, and an aspherical surface for the second light beams to pass therethrough.
Abstract:
An LED (light emitting diode) lamp includes a baseboard (10), an LED (30), a holder (20), a first lens (40), and a cylinder lens (42). The LED is set on the baseboard, the holder is set on the baseboard surrounding the LED, the first converging lens is mounted in the holder and located above the LED, and the cylinder lens is mounted in the holder above the first lens. In an alternative embodiment, the first lens and the cylinder lens are replaced by a single curving cylinder lens (44). The LED lamp can converge the intensity of illumination and can flatten the range of illumination.
Abstract:
An optical pickup system includes first and second light sources, a composite prism, a reflective prism, a collimating lens and an objective lens. The first light source emits a first light beams with a first wavelength. The second light source emits a second light beams with a second wavelength greater than the first wavelength. The composite prism includes a first, second and third prism for receiving the first and second light beams from the first and second prism. The reflective prism includes first and second units for internally reflecting the first and second light beams. The collimating lens is disposed in a common optical path for collimating the first and second light beams. The objective lens is disposed in the common optical path for focusing the first and second light beams from the collimating lens on two different types of optical recording media.