32 results about "Meridional direction" patented technology

A pneumatic tire comprises a carcass made from at least one cord array comprised of many arch portions of a cord extending between a pair of bead portions in a meridional direction and arranged over a full circumference of the tire at an equal interval P in a circumferential direction of the tire and many circumferential portions of the cord alternately arranged in the bead portions, each connecting ends of adjacent arch portions to each other in the bead portion and extending substantially in the circumferential direction. In this case, the cord array is arranged at n layers (n is an integer of 2 or more) while offsetting these layers by a distance L obtained by dividing the interval P by n in the circumferential direction. Further, the bead wire reinforcing layer is arranged outward from the overlap region of the circumferential portions in the radial direction so as to sandwich the cord array from both sides thereof.

An image reading apparatus with an image reading lens configured to reduce a field curvature and a magnification error in the sub-scan direction, includes a photoelectric conversion element having picture elements arrayed in the main-scan direction, and an image reading lens for imaging imagewise information on a surface of an original, upon a light receiving surface of the photoelectric conversion element, the image reading lens including at least one anamorphic lens having anamorphic surfaces formed at a light entrance surface and a light exist surface thereof, respectively, wherein, when a sectional shape of the anamorphic surface in a main-scan section which contains an optical axis of the image reading lens and the main-scan direction, is taken as a meridional, a curvature of a sagittal of the anamorphic surface defined within a plane being perpendicular to the main-scan section and containing a normal to the anamorphic surface at an arbitrary position in the meridional direction, changes continuously along the meridional direction from the optical axis.

A ball body is formed with a mold having upper and lower mold half. Dimples 16 having a shape inverted from the shape of the pimples of the mold are formed on the ball body. The dimples 16 in the vicinity of the equatorial line have a size in the meridional direction D1 being greater than a size in the latitudinal direction D2. The difference between the size in the meridional direction D1 and the size in the latitudinal direction D2 is 0.01 mm or greater and 0.50 mm or less. By grinding the ball body in the vicinity of the equatorial line, a flash generated on the seam resulting form the mold is removed. According to the grinding, the size in the meridional direction of the dimple 16 is reduced, and thus, plane shape of the dimple becomes closer to a perfect circle.

An imaging device includes an imaging optical system, an image sensor, and an optical fiber bundle including optical fibers to guide light from the system to the sensor. The optical fiber bundle includes an optical fibers first and second pair, each pair having two optical fibers that are adjacent in a meridional direction. In the first and second pair of optical fibers, a first value, which is a value representing a ratio of a distance component in the meridional direction between the optical fibers centers along a light-exit surface to a distance component in the meridional direction between optical fibers centers along a light-incident surface, is greater than one. The optical fibers second pair is located farther from an optical system optical axis than the optical fibers first pair. The first value in the optical fibers second pair is greater than the first value in the optical fibers first pair.

A pneumatic radial tire has a carcass structure, a belt structure, and a tread. The belt structure has at least two plies of reinforcing cords, the cords in the at least two plies being inclined at angles greater than 5° relative to the tire centerline. The cords in the belt plies are inclined at equal but opposite directions relative to the tire centerline. The belt plies have a stiffness variation in the circumferential and meridional directions of the belt plies wherein the stiffness variation is in the range of 12 to 25% between a radially outermost belt ply and a radially innermost belt ply.

The present invention provides a hyperspectral resolution X-ray grazing incidence microscopic imaging system, which includes two grazing incidence curved surface X-ray optical devices named as the first optical device and the second optical device respectively, the first optical device and the second optical device The optical axis of the second optical device is orthogonal, the X-ray emitted by the object point is reflected by the first optical device, and focused in the meridional direction to form a quasi-monochromatic one-dimensional image, and then realized in the sagittal direction by the second optical device The light is split and focused to form a highly monochromatic two-dimensional image, which is finally imaged on a recording medium. The hyperspectral resolution X-ray grazing incidence microscopic imaging system of the present invention has the characteristics of high spatial resolution, good energy resolution and small aberration, and well overcomes the shortcomings of traditional X-ray microscopes.

Provided is an imaging optical system which comprises, sequentially from the object side to the image surface side, a first lens having a positive power, a second lens which is a meniscus lens having a convex surface on the image side, a third lens having a positive power, and a fourth lens having a negative power. The power of the third lens in the vicinity of the principal ray in the meridional direction is positive in the paraxial area, and is negative in an area distant from the optical axis. The power of the fourth lens in the vicinity of the principal ray in the meridional direction is negative in the paraxial area, and is positive in an area distant from the optical axis. The first lens is provided with diffraction gratings on the image side surface. If it is assumed that the focallength of the second lens is f2, the resultant focal length of the imaging optical system is fT, and the distance between the aperture stop or the apex of the object side surface of the first lens, whichever is closer to the object side, and the image surface is TTL, the following formulae are satisfied; |f 2 / f T | >= 3 (1) TTL / f T <= 1.2 (2).

Provided is an optical system with an excellent anti-reflection effect and ghost suppression effect including an aspherical lens having at least one of an incident surface and an exiting surface of an optical glass formed of an aspherical surface, in which: the aspherical surface includes an anti-reflection structure formed thereon, the anti-reflection structure having an anti-reflection function and including multiple inorganic structural parts finer than a used wavelength; and the aspherical surface has a point that satisfies the following expression: |(1 / Rm−1 / Rs) / Rm|>5.0×10−5, where Rm denotes a radius of curvature in a meridional direction at an arbitrary point, and Rs denotes a radius of curvature in a sagittal direction at the arbitrary point.

An optical device (100) is disclosed, comprising a collimator (110) and a first lenslet array (130, 430) and a second lenslet array (140, 440). The first lenslet array and the second lenslet array are provided with the same tessellation pattern, aligned with each other and arranged such that a projection (150) of a light source (122) is focused on the second lenslet array, which is configured to emit non-focused light. At least some of the lenslets of the second array are formed such that a ratio of their sagittal and meridional dimensions varies at least along the meridional direction (M) of the second lenslet array, based on the varying shape of the projection of the light source as seen by said lenslets, so as to achieve an improved mixing, intensity and uniformity of light emitted from the optical device.

The invention discloses a laser displacement sensor, which comprises a laser, an imaging objective lens and a photosensitive element, wherein the laser is used for injecting a laser beam; light received and injected by the imaging objective lens is incident to the photosensitive element; when modulation transfer function (MTF) analysis is carried out on the imaging objective lens and the photosensitive element, the analysis result meets the following conditions: in a condition in which the main arrangement direction of multiple photosensitive units of the photosensitive element is a sagittal direction, MTFS>MTFT; in a condition in which the main arrangement direction of multiple photosensitive units of the photosensitive element is a meridional direction, MTFT>MTFS; and the MTFS is the MTF value in the sagittal direction, and the MTFT is the MTF value in the meridional direction. The objective lens design difficulty can be reduced, the manufacturing cost and the maintenance cost are saved, the measurement accuracy is improved, and bad influences caused by vibration or mechanical deformation in the case of use can be better handled.