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 (99) for an information recording and/or reproducing device is compatible with three types of optical recording media. The optical pickup head includes a first light source (12a) emitting a first beam with a first wavelength, a second light source (12b) emitting a second light beam with a second longer wavelength, a third light source (12c) emitting a third light beam with a third even longer wavelength, a photodetector (13) receiving the first, second and third beams, a prism unit (3), a collimating lens (6) for collimating the first light beams into a parallel beam, and an objective lens (8) for focusing the three light beams onto the three types of optical recording media respectively. The prism unit includes a first and a second aberration-correcting portions (440, 420) respectively for the second and third light beams to pass therethrough.

Abstract: An optical pickup head for an information recording and/or reproducing device compatible with two types of optical recording media is provided. The pickup head includes a first light source (1a) emitting a first wavelength beam, a second light source (1b) emitting a second wavelength beam, a photo detector (2) receiving the first and second beams, a hologram unit deviating the first and second beams onto the receiving member, a prism (4), a collimating lens (50) for collimating at least one of the first and second beams into a parallel beam, and an objective lens (60) for focusing the two beams to the two types of optical recording media respectively. The prism unit includes first and second portions for transmitting the first and second beams, a third portion for transmitting both the first and second beams, and an aberration-correcting portion for one of the first and second beams to pass therethrough.

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: 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: A wide angle lens includes, in order from an object side, a first positive convex lens element, a second concavo-convex negative lens element, and a third lens element. The first lens element is made of an optical glass and defines a first convex aspheric surface on the object side and a second plane aspheric surface. The second lens element is made of an optical plastic and defines a third concave aspheric surface on the object side and a fourth convex aspheric surface. The third lens element is made of an optical plastic and defines a fifth high-aperture size convex aspheric surface on the object side and a sixth wave-shaped aspheric surface. Each of the lens elements is symmetrically disposed about an optical axis of the lens. The lens is compact and capable of covering total field angle of up to about 70 degrees.

Abstract: An optical pickup head (100) for a high density recording and/or reproducing device compatible with three types of optical recording media. The pickup head includes a first light source (11a) emitting first beams with a first wavelength, a second light source (12a) emitting second beams with a second longer wavelength, a third light source (13a) emitting third beams with a third even longer wavelength, a prism unit (3), a collimating lens (4) located beside the prism unit, and an objective lens (7) for receiving the light beams and transmitting them to the recording media respectively. The prism unit includes a first portion facing the first source and receiving the first beams, a second portion facing the second source and receiving the second beams, a third portion facing the third source and receiving the third beams, and first and second aberration-correcting portions for the second and third beams to pass therethrough.

Abstract: An optical pickup system includes a first light source emitting first light beams with a first wavelength, a second light source emits second light beams with a second wavelength greater than the first wavelength, a third light source emits third light beams with a third wavelength greater than the second wavelength, a composite prism comprising a first prism facing the first and second light sources, a second prism facing the third light source, and a third prism for receiving the first, second and third light beams from the first and second prisms, the first prism has a surface facing the first and second light sources, the surface defines first and second regions, the second region has an aspherical surface to compensate aberration of the second light beams, a collimating lens and objective lens disposed in a common optical path for transmitting the three light beams from the composite prism.

Abstract: A method for designing an aspheric spectacle lens includes: designing a spherical spectacle lens, the spherical spectacle lens having a first surface being substantially flat, and a second surface being spherical and having a predetermined lens power; and correcting aberration of the spherical spectacle lens by changing the second surface into an aspheric surface. The second step includes: defining an aspheric surface by an aspheric-surface function, parameters of the function including a conic constant and at least one aspheric-surface coefficient; defining a merit function, the merit function having a parameter of inflection point, the parameter of inflection point being described with the conic constant and the aspheric-surface coefficient of the aspheric-surface function; and calculating a resolution of the merit function by a damped least square method.

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.

Abstract: A lens that can be used in a digital camera includes in sequence a first lens element (20), a second lens element (30) and a third lens element (40). The first lens element is biconvex, and includes a first aspheric surface (22) and a second aspheric surface (24). The second lens is concavo-convex, and includes a third aspheric surface (32) and a fourth aspheric surface (34). The third lens includes a wavelike fifth aspheric surface (42) and a wavelike sixth aspheric surface (44). All of the lens elements are made of glass. The lens has a compact volume, and provides stable imaging performance and good image quality.

Abstract: An optical pickup head compatible with two different optical recording media includes a first semiconductor module emitting a first light beam with a first wavelength; a second semiconductor module emitting a second light beam with a second wavelength greater than the first wavelength; a prism module including a reflective multi-surface prism for changing a transmission direction of a light beam passing therethrough by reflecting the light beam between surfaces thereof, an optical path coupler disposed between the first and second semiconductor modules and the reflective multi-surface prism for coupling the first and second light beams and transmitting the first and second light beams toward the reflective multi-surface prism, and an aspherical surface for converging the second light beam; and an objective lens for receiving the first and second light beams and transmitting the first and second light beams to two different recording media respectively.

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.