Abstract:
This infrared imaging optical system used for infrared rays comprises, from the object side to the image side, an aperture (101, 101A, 101B, 1101, 2101, 3101, 9101), a single lens (103, 103A, 103B, 1103, 2103, 3103, 9103) made of the synthetic resin, and an imaging element, the object side surface of the lens being convex to the object side in the paraxial area, wherein F-number of the system is 1.4 or smaller.
Abstract:
An infrared-reflective film (10) includes a substrate film (12) composed of a polyolefin film or a polycycloolefin film. The substrate film (12) has two main surfaces and an infrared-reflective layer (11) is formed on one main surface and the other main surface faces air, nitrogen gas, inert gas or a vacuum. A surface of the infrared-reflective layer (11) faces either of air, nitrogen gas, inert gas or a vacuum.
Abstract:
An imaging lens for use with an operational waveband over any subset of 7.5-13.5 μm may include a first optical element of a first high-index material and a second optical element of a second high-index material. At least two surfaces of the first and second optical elements may be optically powered surfaces. A largest clear aperture of all optically powered surfaces may not exceed a diameter of an image circle of the imaging lens corresponding to a field of view of 55 degrees or greater by more than 30%. The first and second high-index materials may have a refractive index greater than 2.2 in the operational waveband, an absorption per mm of less than 75% in the operational waveband, and an absorption per mm of greater than 75% in a visible waveband of 400-650 nm.
Abstract:
An infrared imaging optical system for focusing infrared radiation on an infrared detector, including: a front lens group having a negative optical power to receive infrared radiation and including a first front lens and a second front lens each with at least one aspherical surface; an intermediate lens group that receives the infrared radiation from the front lens group and includes a first intermediate lens, a second intermediate lens, and a third intermediate lens each with at least one aspherical surface; and a rear lens group having positive optical power, wherein the rear lens group receives the infrared radiation from the intermediate lens group and includes a first rear lens and a second rear lens each with at least one aspherical surface, and a third rear lens, wherein the imaging optical system has a stop between the rear lens group and a focal plane at said infrared detector.
Abstract:
An optical instrument that includes: an objective lens having an outer convex surface, an inner concave surface, a center, a first optical axis, and a bore cut substantially though the center; a set of objective lenses positioned within the bore and along the first optical axis; a first reflective element disposed along the first optical axis, within a first distance from the convex surface and tilted at a first tilt angle, the first reflective element configured to reflect rays incident along the first optical axis onto a second optical axis; and a second reflective element disposed along the second optical axis and within a second distance from the concave surface, wherein the first tilt angle is selected such that the first and the second distances are minimized.
Abstract:
A zoom lens system is disclosed. The zoom lens system forms a final image of an object and a first intermediate real image between the object and the final image. The zoom lens system includes a first optical unit located between the object and the first intermediate real image. The first optical unit comprises at least one optical subunit which is moved to change the size (magnification) of the first intermediate real image. The zoom lens system also includes a second optical unit located between the first intermediate real image and the final image, at least a portion of which is moved to change the size (magnification) of the final image. The zoom lens system provides a wide zoom range of focal lengths with continuous zooming between the focal lengths.
Abstract:
A chromatically dispersive lens configuration including thermal compensation may be utilized in chromatic confocal point sensor optical pens for chromatic range sensing. The lens configuration may include a negative power doublet lens 101 and a positive power lens portion 105. The positive power lens portion 105 comprises at least two lens elements 102, 103, 104 which compensate for the overall thermal sensitivity of a chromatic confocal point sensor optical pen. The lens elements of the positive power lens portion 105 which compensate for thermal sensitivity have an average coefficient of thermal defocus which is in a range that is at lowest 10 ppm per 10 °C. The lens configuration can be implemented with dimensions which fit a standard commercial chromatic confocal point sensor optical pen, while maintaining a level of optical performance sufficient for chromatic range sensing.