Monitoring lens
A lens and lens technology, used in optical components, optics, instruments, etc., can solve the problems of inability to meet imaging clarity, weak light transmission performance, and large size.
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[0037] The present invention will be described in detail below in conjunction with the drawings:
[0038] As shown in the figure, the monitoring lens is set in sequence from the side facing the object:
[0039] The first lens element 1 has a meniscus shape that has a negative refractive power and is convex toward the object.
[0040] The second lens element 2 is a spherical or aspherical lens with negative refractive power.
[0041] The third lens element 3 that has a spherical or aspherical lens with positive refractive power and is used to correct curvature of field.
[0042] A diaphragm element 4 is provided behind the second lens element 2, and the diaphragm element 4 is provided between the second lens element 2 and the third lens element 3.
[0043] A lens assembly with positive refractive power composed of the fourth lens element 5 and the fifth lens element 6 joined together, in which the fourth lens element 5 with positive refractive power is in the front, and the fifth lens ele...
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Abstract
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