High-aperture wide angle lens consisting of an object-side dispersing operational group (1, 12), an air clearance which corresponds to 0.3 times to 0.7 times (7) or to 0.25 times to 0.45 times (14) the total height of the wide angle lens, an aperture stop (11, 16) located approximately in the middle, and a positive lens group (6, 15) following thereafter, which consists of a cemented component (5, 17) having an overall positive refractive power and a second collecting operational group (4, 18), the object-side dispersing operational group (1, 12) and the second collecting operational group (4, 18) each having at least one aspherical surface. In a corresponding construction having four or six lenses, a typical angle of aperture of 130 DEG or 146 DEG and more is achieved in conjunction with an f number of approximately 2.0. The high-aperture wide angle lens according to the invention is suitable in particular as a camera lens for electronic image processing systems such as CCD cameras.

High-aperture wide angle lens

An extreme wide angle, very large aperture, very compact, solar blind, UV imaging lens system. The lens system (100, 200, 300, 400) has a fused silica polyvinyl alcohol glass color filter (10, 20, 28, 30), a lens made of fused silica (40), a lens made of nickel sulfate (50), a layer of coupling fluid (52) and another lens made of fused silica (60). Alternatively, sapphire (140) can be used after the color filter instead of the fused silica (40). An alternative lens is composed of two layers of fused silica (210, 220), a layer of nickel sulfate (240), another layer of fused silica (250), coupling fluid followed by polyvinyl alcohol (252), a color glass filter (260) and coupling fluid followed by fused silica (270). In a fourth embodiment, the lwo layers of fused silica (310, 370) are followed by polyvinyl alcohol (328), a layer of colored glass filter (330), fused silica (340), nickel sulfate (350), coupling fluid (352), and fused silica (360).

Extreme wide angle, very large aperture, compact, uv imaging lens

A material spreader assembly for the broadcast spreading of particulate material from the trailer hitch of a vehicle. A hopper for storing the particulate material is supported by a frame having a trailer hitch coupler for connection to the vehicle. A spreader including a spinner driven by an electric motor receives and disperses the particulate material. A control circuit receives electric current from the vehicle via a plug interface and a wiring harness and controls the operation of the spreader. A remote communicates user commands to the control circuit. The control circuit includes a motor control processor that controls a motor power relay and a motor driver to gradually ramp up the current supplied to the spreader for start up the spreader while preventing a high transient current draw spike. Component feedback sensors enable the motor control processor to provide an emergency shut off feature and warning signals.

Material Spreader Utilizing Vehicle Power And Having Operational Wireless Control

PURPOSE:To obtain a wide angle lens compensated at its various aberrations by satisfying an optical system constiting of nine meniscus lenses arranged in the positive, negative, negative, positive, positive, positive, positive, negative, positive, and positive order successively from the object side with prescribed conditions. CONSTITUTION:The 1st lens is opposed at its convex surface to the object side, the 2nd and 3rd lenses are opposed at their convex surfaces to the object side, the 4th, 5th and 6th lenses are opposed at their small radius curvatures surfaces to the image side, the 7th lens has both concave surfaces and the 8th and 9th lenses are opposed at their small radius corvature surfaces to the image side, A retrofocus type lens system consisting of 8 groups/9 lenses as a whole is constituted by joining the 6th lens with the 7th lens. The lens system is made satisfy formulas I -VI [f: the focal distance of the whole system, f1,2,3: the composite focal distance of the 1st-3rd lenses, ni: refractive index of d-line of the i-th lens, ri: radius curvatures of the i-th surface, di: an interval between the i-th surface and the (i+1)th surface].

Wide-angle lens

An inverted telephoto type wide angle lens comprises, in succession from the object side, a divergent first group, a diaphragm-forward convergent second group and a diaphragm-rearward convergent third group. The first group includes a positive meniscus lens having its convex surface facing the object side, and three negative meniscus lenses having their convex surfaces facing the object side. The second group includes two positive lenses, a negative meniscus lens having its convex surface facing the object side, and a positive lens. The third group includes a positive meniscus having its convex surface facing the image side, a doublet biconcave negative lens and two positive lenses. The lens system satisfies certain conditions.

Inverted telephoto type wide angle lens

A large-aperture ultra-wide angle photographic lens system which have such a small lens diameter as to be compatible with filters designed for use with other lens systems and wherein various aberrations are favorably corrected.

Ikeda Yoshitsugi

Papers

Large aperture ultra wide angle photographic lens system

Ultraweitwinkelobjektiv mit grosser relativer oeffnung