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Zoom projection lens

A projection lens and lens technology, applied in the field of optical lenses, can solve the problems that the zoom projection lens cannot meet the requirements of lightness, thinness and shortness, and achieve the effect of correcting aberrations, satisfying lightness, thinness and shortness, and reducing the number of lenses

Active Publication Date: 2012-11-21
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a zoom projection lens that can save costs and meet the requirements of light, thin and short in view of the defect that the zoom projection lens in the prior art cannot meet the requirements of lightness, thinness and shortness

Method used

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Experimental program
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no. 1 Embodiment

[0039] Table 1-1 shows various parameters of the first specific embodiment of the zoom projection lens, S1 to S8 from the object end to the image end are the object end surface S1 of the first lens 11, the image end surface S2 of the first lens 111, and And so on to the image end surface S8 of the fourth lens 23 .

[0040] In this first specific example, the second lens 21 is a plano-convex lens, the third lens 22 is a spherical glass lens, the fourth lens 23 is an aspheric glass lens, and the focal length f1 of the first lens group 1 is -41.6498 mm. The focal length f2 of the second lens group 2 is 26.1888 mm. The focal length fw of the zoom projection lens at the wide-angle end is 21.1343 mm. The total length tt of the zoom projection lens is 82 mm. is 56.0554 mm, and the exit pupil position ex of the system is -34.0751 mm, satisfying the aforementioned conditional formulas (1) to (5).

[0041] In addition, the numerical aperture (F-number) is 2.64, 2.70, and 2.75 in sequen...

no. 2 Embodiment

[0050] Table 2-1 is various parameters of the second specific embodiment of the zoom projection lens, the second lens 21 is a biconvex lens, the third lens 22 is an aspheric glass lens, the fourth lens 23 is a spherical glass lens, the The focal length f1 of the first lens group 1 is -41.4927 mm, the focal length f2 of the second lens group 2 is 26.7895 mm, the focal length fw of the zoom projection lens at the wide-angle end is 21.1367 mm, the total length tt of the zoom projection lens is 77.4095 mm, and the zoom projection lens The back focus length bf of the lens is 25.9365 mm, the length lt of the zoom projection lens is 51.4730 mm, and the exit pupil position ex of the system is -35.8658 mm, which satisfy the aforementioned conditional formulas (1) to (5).

[0051] In addition, the numerical aperture (F-number) is 2.64, 2.70, and 2.76 in sequence from wide-angle end, intermediate state, and telephoto. The focal length of the zoom projection lens is 21.1367 mm, 22.1754 mm,...

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Abstract

The invention relates to a zoom projection lens. The zoom projection lens comprises a first lens group and a second lens group which are sequentially arranged from an object end to an image end of the lens, the first lens group has a negative refractive index and is composed of a first lens, the second lens group has a positive refractive index and is composed of a second lens, a third lens, a fourth lens and an aperture stop which is located between the second lens and the third lens, the first lens is an aspheric surface plastic lens, and the third lens or the fourth lens is an aspheric surface glass lens. The zoom projection lens satisfies the relationship that 1.463<| tt / lt | <1.505, wherein tt represents the total length of the zoom projection lens, and lt represents the length of the zoom projection lens; and the zoom projection lens is only composed of four lenses, and the quantity of the lenses is reduced, so that costs are saved, the requirements of lightness and shortness can be met, and aberration of projection images can be effectively corrected by means of the aspheric lenses.

Description

technical field [0001] The invention relates to an optical lens, in particular to a zoom projection lens for a projector. Background technique [0002] In recent years, cathode ray tube projection devices (Cathode Ray Tube, CRT) have gradually been replaced by thinner and smaller projection devices such as Liquid Crystal Displays and Digital Light Processing projection devices (DLP). [0003] Wherein, the chief ray (chief ray) of the non-telecentric system (Non-telecentric) of the digital light source processing projection device is not parallel to the optical axis, and the zoom projection lens of the non-telecentric system can be compared with the zoom projection lens of the telecentric system. A total internal reflection prism is omitted to save the cost of the zoom projection lens. In addition, since the chief ray of the non-telecentric system is not parallel to the optical axis, it enters the zoom projection lens at an angle, causing the projected image to shift upwards...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177G02B1/00G02B3/00
Inventor 李赞桦
Owner ASIA OPTICAL CO INC
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