Abstract:
A dual focal length optical system includes a first optical system and a second optical system. The first optical system is positioned along an optical axis and includes an optical structure having an object side surface and an image side surface. The object side surface and the image side surface include a refractive surface portion and a reflective surface portion. The first optical system has a focal length. The second optical system is positioned on the same optical axis and has a focal length. The focal length of the first optical system is longer than the focal length of the second optical system.
Abstract:
A dual focal length optical system includes a first optical system and a second optical system. The first optical system is positioned along an optical path and includes an optical structure having an object side surface and an image side surface. The first optical system also includes a first surface of an intermediate reflective element located between the object side surface and the image side surface of the optical structure as viewed along the optical path. The first optical system has a first focal length. The second optical system shares a portion of the same optical path and includes a second surface of the same intermediate reflective element as that of the first optical system. The second optical system has a second focal length. The first focal length of the first optical system is longer than the second focal length of the second optical system.
Abstract:
A method of producing a digital image with improved resolution during digital zooming, including simultaneously capturing a first low resolution digital image of a scene and a second higher resolution digital image of a portion of substantially the same scene. A composite image is then formed by combining the first low-resolution digital image and a corresponding portion of the high resolution digital image. Digital zooming of the composite image produces a zoomed image with high resolution throughout the zoom range and improved image quality.
Abstract:
A tuft forming mechanism including a yarn feed mechanism and a yarn severing means (6, 18), the yarn feed mechanism including a passage (5) along which yarn (2) is guided to said yarn severing means (6, 18) and an intermittently rotatable feed disc (1) which engages the yarn (2) to advance the yarn (2) along the passage (5).
Abstract:
A Bravais lens includes a front, positive power lens group and a rear, negative power lens group. These lens groups, in combination, provide the Bravais lens with a negative focal length and a negative power. The front, positive power lens group includes a positive power lens element and a negative power lens element. The rear, negative power lens group includes another negative power lens element and another positive power lens element.
Abstract:
A scanner configured to provide a two-dimensional scan of a radiation beam moving along the path, including two deflectors and a scan lens located downstream in the path of the beam from the deflectors and separated from the farthest deflector by air equivalent distance at least equal to the focal length of the scan lens.
Abstract:
An improved bedding anchor, which comprises a somewhat U-shaped hook with a plastic retainer strip. An end of the bed sheet or like sheet material is wrapped around the retaining strip and the retaining strip with the end of the bed sheet wrapped therearound is inserted in the U-shaped hook. An elastic strip is connected to the hook at one end and at its other end. At the other end of the strip is a retaining pad which is preferably formed of a foam-like member, and is inserted between a box springs and a mattress. Preferably, a separate bedding anchor is located at each of the corners of a bed to retain the sheet in a taut condition.
Abstract:
An illuminating system, which illuminates a line and translates that line over a document on a platen of a scanner or copier which receives light from the line on an image (photo) receptor thereof, uses primary and secondary reflectors having internal reflective surfaces which are elliptical troughs. An elliptical trough is defined here as a surface having an elliptical cross section and maintaining that same cross section over its length. The primary reflector contains a lamp having a linear filament in a plane containing the major axis of the primary reflector ellipse and located at one of the focii thereof so as to provide a conjugate line for the light from the lamp along a line containing the other of the focii of the primary ellipse reflector. The primary elliptical trough is terminated by an aperture plate having an aperture in which the line is located. A secondary reflector has an internal reflective surface with a slit facing the document to be illuminated. The secondary reflector has focii, one of which is common with one of the focii of the first reflector located in the aperture while the other focii is along a line in the plane of the document being illuminated. The aperture is sized so that light retroreflected from the document in the image plane on the secondary reflector does not enter the primary reflector and affect the light emanating from the primary reflector which illuminates the line on the document.
Abstract:
A woven fabric which has been woven on a needle loom wherein the weft loops are secured by a knitted thread construction, the secured weft loops being located in board of the warp thread defining the opposite edge of the fabric to the edge whereat weft insertion has taken place and the knitted thread construction being woven between warp threads positioned adjacent opposite said edge.
Abstract:
A heald frame for a weaving loom comprising an upper cross-member and a lower cross-member adapted to support healds directly therebetween. The upper and lower cross-members are joined together by spaced end members and a plurality of connection members spaced along the length of the cross-members between the end members and attached to the cross-members to restrain relative movement between the cross-members and retain a constant spaced relationship between the cross-members along their length. The connection members have portions of a narrow width extending between the upper and lower cross-members so that, during weaving, warp yarns pass the connection members without interference. First and second connection members are disposed, respectively, at opposite ends of each connecting member for causing reciprocation of the frame.