Abstract: Disclosed herein is an imaging lens unit, including: a first lens having a positive (+) power; a second lens having a negative (?) power; a third lens selectively having one of a positive (+) and negative (?) power; a fourth lens having a negative (?) power; and a fifth lens having a negative (?) power, wherein the first lens, the second lens, the third lens, the fourth lens, and fifth lens are arranged in order from an object to be formed as an image, and the fourth lens is concave toward an image side.

Abstract: There is provided an optical system configured of 4-sheet lenses to have a wide angle of view. The optical system includes: a first lens having a positive refractive power, with both surfaces being convex; a second lens having a negative refractive power, with both surfaces thereof being concave; a third lens having a positive refractive power and a meniscus shape; and a fourth lens having a negative refractive power, with both surfaces thereof being concave, all of which are disposed in order from an object to a front upper surface. In the optical system, the refractive powers of the first lens to the fourth lens satisfy the following Conditional Expression 1. f ? ? 1 f ? ? 4 < - 1.1 Conditional ? ? Expression ? ? 1 In Conditional Expression, f1: a focal distance of the first lens and f4: a focal distance of the fourth lens.

Abstract: There is provided an optical system configured of 4-sheet lenses to have a wide angle of view. The optical system includes: a first lens having a positive refractive power, with both surfaces being convex; a second lens having a negative refractive power, with both surfaces thereof being concave; a third lens having a positive refractive power and a meniscus shape; and a fourth lens having a negative refractive power, with both surfaces thereof being concave, all of which are disposed in order from an object to a front upper surface. In the optical system, the refractive powers of the first lens to the fourth lens satisfy the following Conditional Expression 1. f ? ? 1 f ? ? 4 < - 1.1 Conditional ? ? Expression ? ? 1 In Conditional Expression, f1: a focal distance of the first lens and f4: a focal distance of the fourth lens.

Abstract: An optical pickup which is compatible with different types of media is disclosed. A plurality of light sources emit light with different wavelengths. Light path changers change the path of light emitted by the plurality of light sources so that the light is incident upon an objective lens. The objective lens focuses the incident light onto a recording medium. A collimating lens is disposed in front of the objective lens to collimate the incident lights. The collimating lens is movable to correct a spherical aberration. A diffractive optical element is disposed in a path of a light with a short wavelength and has a diffractive surface to correct a chromatic aberration.

Abstract: There is provided an optical movement sensing system which can be miniaturized and ensures a wide angle of view. The optical movement sensing system collecting light reflected from an object to be imaged on an optical sensor, the optical movement sensing system including: a wide-angle lens including a first lens element having a curved object-side surface; and a second lens element having an object-side surface in contact with an image-side surface of the first lens element and having a planar image-side surface. The optical movement sensing system with this configuration can be reduced in size and weight and has a wide angle of view. Therefore, the optical movement sensing system is applicable to a mobile device such as a mobile telecommunication terminal and assures sufficient peripheral light amount.

Abstract: An optical lens system of a mobile camera is provided. The lens optical system includes: an optical lens in which one pair of incident surfaces corresponding to the divided view angles are adjacently arranged at the center portion, optical beams incident at the divided view angles being transmitted through respective off-axis lens systems; and one pair of image sensors separately arranged under both lower portions of the optical lens to receive the optical beams transmitted through the off-axis lens systems. As one pair of the image sensors is separately arranged on both lower portions of the optical lens, the images formed in the image sensors can be easily combined. Moreover, during the combination of the image, the disparity of the images can be prevented by the narrowed distance between the incident surfaces.

Abstract: The present invention provides a mobile camera optical lens system which assures a wide view angle by dividing a view angle into two or more view angles, and simultaneously achieves the thinness of the mobile camera optical lens system by providing separate off-axis lens systems respectively corresponding to the split view angles.

Abstract: An optical lens system of a mobile camera is provided. The lens optical system includes: an optical lens in which bilaterally symmetrical off-axis lens systems corresponding to the divided view angles are integrally formed and arranged in parallel on the same plane, the optical beams incident at the divided view angles being transmitted through the respective off-axis lens systems; and an image sensor for receiving the optical beams transmitted through the off-axis lens systems, the image sensor being bisected into a green light receiving region and a mixed light receiving region of red and blue colors. Accordingly, the mega resolution can be achieved using the optical lens having the height of VGA grade. Moreover, as the whole length of the optical lens system in the mega optical system is greatly reduced, the camera optical system can have the slim profile.

Abstract: There is provided a subminiature imaging optical system suitably applicable to a subminiature optical device such as a mobile phone camera. The subminiature imaging optical system including: a first lens having positive refractive power and both convex surfaces; a second lens having negative refractive power and a concave image-side surface; a third lens having negative refractive power and a meniscus shape with a convex image-side surface; and a fourth lens having negative refractive power.

Abstract: In a camera module having an array lens, a first lens group has at least two lenses. A second lens group has a plurality of lenses corresponding to the lenses of the first lens group, the second lens group stacked below the first lens group and interposing a spacer part therebetween. An image sensor has an imaging region where light passing through the first and second lens groups is imaged. Also, a shielding unit shields portions excluding apertures of the lenses of the first and second lens groups, the shielding unit disposed between the first and second lens groups. The camera module has a lower optical system along an optical axis for smaller size, keeps light refracted from an adjacent lens from affecting an image, blocks leakage of light for imaging and increases definition of the image through signal processing.

Abstract: There is provided a subminiature imaging optical system suitably applicable to a subminiature optical device such as a mobile phone camera. The subminiature imaging optical system including: a first lens having positive refractive power and both convex surfaces; a second lens having negative refractive power and a concave image-side surface; a third lens having negative refractive power and a meniscus shape with a convex image-side surface; and a fourth lens having negative refractive power.

Abstract: A subminiature imaging optical system including: a first lens having overall positive refractive power, the first lens including a first lens part having a convex object-side surface, a second lens part having an object-side surface in contact with an image-side surface of the first lens part and a third lens part having an object-side surface in contact with an image-side surface of the second lens part; and a second lens having overall positive refractive power, the second lens including a fourth lens part having an object-side surface with a convex center and a concave peripheral portion, about an optical axis, a fifth lens part having an object-side surface in contact with an image-side surface of the fourth lens part and a sixth lens part having an object-side surface in contact with an image-side surface of the fifth lens part, wherein the second lens part has a stop provided on the object-side or image-side surface thereof.

Abstract: A subminiature imaging optical system includes a first lens including a first lens part having a convex object-side surface, a second lens part having an object-side surface in contact with an image-side surface of the first lens part, and a third lens part having an object-side surface in contact with an image-side surface of the second lens part and a concave image-side surface, about the optical axis; and a second lens including a fourth lens part having an object-side surface with a convex center and a concave peripheral portion about the optical axis, a fifth lens part having an object-side surface in contact with an image-side surface of the fourth lens part, and a sixth lens part having an object-side surface in contact with an image-side surface of the fifth lens part, and an image-side surface with a concave center and a convex peripheral portion about the optical axis.

Abstract: An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low density recording medium, a second objective lens having a high NA suitable for a high density recording medium, a first light source that emits short wavelength light which is focused onto an optical recording medium by the first and second objective lenses, a first photodetector that receives a returning reflected light from the optical recording medium, and a first optical path converter for selectively guiding part of the light emitted from the first light source towards the first or the second objective lens, and guiding the reflected light towards the first photodetector.

Abstract: There is provided an optical movement sensing system which can be miniaturized and ensures a wide angle of view. The optical movement sensing system collecting light reflected from an object to be imaged on an optical sensor, the optical movement sensing system including: a wide-angle lens including a first lens element having a curved object-side surface; and a second lens element having an object-side surface in contact with an image-side surface of the first lens element and having a planar image-side surface. The optical movement sensing system with this configuration can be reduced in size and weight and has a wide angle of view. Therefore, the optical movement sensing system is applicable to a mobile device such as a mobile telecommunication terminal and assures sufficient peripheral light amount.

Abstract: A subminiature imaging optical system including: a first lens having overall positive refractive power, the first lens including a first lens part having a convex object-side surface, a second lens part having an object-side surface in contact with an image-side surface of the first lens part and a third lens part having an object-side surface in contact with an image-side surface of the second lens part; and a second lens having overall positive refractive power, the second lens including a fourth lens part having an object-side surface with a convex center and a concave peripheral portion, about an optical axis, a fifth lens part having an object-side surface in contact with an image-side surface of the fourth lens part and a sixth lens part having an object-side surface in contact with an image-side surface of the fifth lens part, wherein the second lens part has a stop provided on the object-side or image-side surface thereof.

Abstract: A subminiature imaging optical system includes a first lens including a first lens part having a convex object-side surface, a second lens part having an object-side surface in contact with an image-side surface of the first lens part, and a third lens part having an object-side surface in contact with an image-side surface of the second lens part and a concave image-side surface, about the optical axis; and a second lens including a fourth lens part having an object-side surface with a convex center and a concave peripheral portion about the optical axis, a fifth lens part having an object-side surface in contact with an image-side surface of the fourth lens part, and a sixth lens part having an object-side surface in contact with an image-side surface of the fifth lens part, and an image-side surface with a concave center and a convex peripheral portion about the optical axis.

Abstract: An optical lens system of a mobile camera is provided. The lens optical system includes: an optical lens in which bilaterally symmetrical off-axis lens systems corresponding to the divided view angles are integrally formed and arranged in parallel on the same plane, the optical beams incident at the divided view angles being transmitted through the respective off-axis lens systems; and an image sensor for receiving the optical beams transmitted through the off-axis lens systems, the image sensor being bisected into a green light receiving region and a mixed light receiving region of red and blue colors. Accordingly, the mega resolution can be achieved using the optical lens having the height of VGA grade. Moreover, as the whole length of the optical lens system in the mega optical system is greatly reduced, the camera optical system can have the slim profile.

Abstract: An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low density recording medium, a second objective lens having a high NA suitable for a high density recording medium, a first light source that emits short wavelength light which is focused onto an optical recording medium by the first and second objective lenses, a first photodetector that receives a returning reflected light from the optical recording medium, and a first optical path converter for selectively guiding part of the light emitted from the first light source towards the first or the second objective lens, and guiding the reflected light towards the first photodetector.

Abstract: An optical pickup which is compatible with different types of media is disclosed. A plurality of light sources emit light with different wavelengths. Light path changers change the path of light emitted by the plurality of light sources so that the light is incident upon an objective lens. The objective lens focuses the incident light onto a recording medium. A collimating lens is disposed in front of the objective lens to collimate the incident lights. The collimating lens is movable to correct a spherical aberration. A diffractive optical element is disposed in a path of a light with a short wavelength and has a diffractive surface to correct a chromatic aberration.