摘要:
A wide angle lens includes a first to a third lenses, a diaphragm, a fourth to a sixth lenses disposed in order from an object side. The fourth lens is a glass lens, and the second lens, the third lens, the fifth lens and the sixth lens are plastic lenses. The fifth lens and the sixth lens constitute a cemented lens. When a center curvature radius on an image side face of the fourth lens is "R42" and a focal length of an entire wide angle lens is "f0", the center curvature radius "R42" and the focal length "f0" satisfy the conditional expression: 2×f0 ≦ |R42| ≦ 5×f0. When a center curvature radius on an object side face of the fourth lens is "R41", the center curvature radii "R41" and "R42" may satisfy the conditional expression: |R41| ≧ |R42|.
摘要:
A wide angle lens (100) comprises a first lens (11), a second lens (12), a third lens (13), a diaphragm (17), a fourth lens (14) and a fifth lens (15) which are arranged in order from an object side to an image side. The first lens (11) is a negative meniscus lens, the second lens (12) is a negative lens in which at least one of lens surfaces is an aspherical surface, the third lens (13) is a positive meniscus lens or a biconvex lens in which at least one of lens surfaces is an aspherical surface, the fourth lens (14) is a negative meniscus lens or a biconcave lens, and the fifth lens (15) is a biconvex lens. The fourth lens (14) and the fifth lens (15) are plastic lenses which constitute a cemented lens (16). When a refractive index of the fourth lens (14) is "n4", the condition "n4 > 1.6" is satisfied and, when a center radius of curvature of a cemented surface of the cemented lens (16) is "R45" and an effective focal length of the entire lens system is "f0", the condition "0.5
摘要:
A compact telephoto lens system that may be used in a small form factor cameras. The lens system may include five lens elements with refractive power. Alternatively, the lens system may include four lens elements with refractive power. At least one of the object side and image side surfaces of at least one of the lens elements is aspheric. Total track length (TTL) of the lens system may be 6.0 mm or less. Focal length f of the lens system may be at or about 7.0 mm (for example, within a range of 6.5-7.5 mm). Lens elements are selected and configured so that the telephoto ratio (TTL/f) satisfies the relation 0.74
摘要:
A folded lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first optical path or axis is refracted to the folding element, which changes direction of the light onto a second optical path or axis with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 16.0 mm or less. The lens system may be configured so that the telephoto ration | TTL/f | is greater than 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.
摘要:
A first lens unit performing communication with an image pickup apparatus (10) with a first voltage (V1) and a second lens unit performing communication with the image pickup apparatus with a second voltage (V2) are selectively attached to the image pickup apparatus. The image pickup apparatus includes a controller (18) configured to operate with a third voltage (V3) different from at least one of the first and second voltages to output a signal for the communication with the first and second lens units, and a determiner (90, 20) configured to determine the type of the lens unit attached to the image pickup apparatus. The controller is configured to produce, as a voltage of the signal for the communication, from the third voltage, one of the first and second voltages corresponding to a determination result of the determiner.
摘要:
A first lens unit performing communication with an image pickup apparatus (10) with a first voltage (V1) and a second lens unit performing communication with the image pickup apparatus with a second voltage (V2) are selectively attached to the image pickup apparatus. The image pickup apparatus includes a controller (18) configured to operate with a third voltage (V3) different from at least one of the first and second voltages to output a signal for the communication with the first and second lens units, and a determiner (90, 20) configured to determine the type of the lens unit attached to the image pickup apparatus. The controller is configured to produce, as a voltage of the signal for the communication, from the third voltage, one of the first and second voltages corresponding to a determination result of the determiner.
摘要:
The invention relates to a wide open wide-angle lens for digital image acquisition, comprising five lenses, that is, as seen looking from the object side, which is from the left, a first negative meniscus lens (112), a second positive lens (118), a third positive lens (126), a fourth negative lens (130), and a fifth positive meniscus lens. A diaphragm (122) is disposed between the second lens (118) and the third lens (126). At least three surface areas in front of the diaphragm and three surface areas behind the diaphragm are designed as aspherical surfaces. However, additional surfaces can also have an aspherical design. Given the extremely compact design and the outstanding optical properties, the proposed wide open wide-angle lens is suitable as an interchangeable lens for hybrid cameras.
摘要:
An imaging lens (2) includes plastic-made first, second, third, fourth, and fifth lens elements (3, 4, 5, 6, 7) arranged in the given order from an object side to an imaging side, each having object-side and imaging-side surfaces (31, 41, 51, 61, 71; 32, 32, 52, 62, 72) facing toward the object and imaging sides, respectively. The first lens element (3) has a positive focusing power, and the object-side surface (31) thereof is a convex surface. The second lens element (4) has a negative focusing power, and the imaging-side surface (42) thereof is a concave surface. The third lens element (5) has a positive focusing power, and each of the object-side and imaging-side surfaces (51, 52) thereof is a convex surface. The fourth lens element (6) is a meniscus lens, and the imaging-side surface (62) thereof is a convex surface. The imaging-side surface (72) of the fifth lens element (7) has a concave area (721) in a vicinity of an optical axis (I) of the fifth lens element (7).