Telecentric large-aperture variable-focus DLP type digital projector lens

Abstract

The invention discloses a zoom lens, specifically a telecentric large aperture zoom DLP digital projection lens, which is arranged in sequence along the optical axis from the object side to the image side, and includes: a first lens group, including a G1 lens and a G2 lens ; The second lens group includes G3 lenses; the third lens group includes G4 lenses; the fourth lens group includes STO diaphragms, G6 lenses and G7 lenses; the fifth lens group includes G8 lenses; , the telecentric large-aperture variable-focus DLP-type digital projection lens of the present invention increases the relative clear aperture, uses a relatively small number of 9 lenses, is low in cost, compact in composition, and realizes two types of 0.45" WGA and 0.47" HD The function of chip sharing can achieve high-definition resolution.

Description

technical field [0001] The invention relates to a zoom lens, in particular to a telecentric large aperture zoom DLP digital projection lens. Background technique [0002] A zoom lens is a camera lens that can change the focal length within a certain range to obtain different wide and narrow field of view angles, images of different sizes and different scene ranges. The zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very beneficial to the composition of the picture. Since one zoom lens can also act as several fixed-focus lenses, it not only reduces the number of photographic equipment to be carried when traveling, but also saves the time for changing lenses. [0003] The existing problems of the projector lens are as follows: [0004] 1. The resolution is not enough, generally below WXGA (1280X800), MTF (a method used to measure the optical frequency, modulation transmission, this way of measuring the op...

AI Technical Summary

Problems solved by technology

[0004] 1. The resolution is not enough, generally below WXGA (1280X800), MTF (a method used to measure the optical frequency, modulation transmission, this way of measuring the optical frequency is measured by how many lines can be displayed within a mm range ) is only optimized below 66lp / mm

[0005] 2. The existing lens has a large number of lenses, generally more than 10, which increases the cost of the lens

[0006] 3. The F number of the existing lens (f number is f / d, f is the focal length, d is the diameter of the entrance pupil) is relatively large, generally above 2.0, and the relative clear aperture is too small

[0007] 4. Existing lenses are generally not compatible with the two chips

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