Zooming projection lens for protection machine

A projection lens and projector technology, applied in the field of zoom projection lens, can solve the problem of insufficient light efficiency of zoom projection lens, and achieve the effect of reducing aberration and improving light efficiency

Active Publication Date: 2013-01-23
ASIA OPTICAL CO INC
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a zoom projection lens that is suitable for projectors with different light sourc

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Zooming projection lens for protection machine
  • Zooming projection lens for protection machine
  • Zooming projection lens for protection machine

Examples

Experimental program
Comparison scheme
Effect test

Example

[0039]

[0040] Table 1-1 shows various parameters of the first specific embodiment of the zoom projection lens. In the first specific embodiment, the convex lens 13 of the first lens group 1 is a postive meniscus lens 13 protruding toward the object end, and the second lens group 2 includes one glass spherical biconvex lens 21. The three-lens group 3 further includes a spherical biconvex lens 35 between the negative lens 31, the positive lens 32 and the aspheric lens 33. From the aspheric lens 33 toward the image end, it further includes the aperture stop 34 and the spherical double lens. A concave lens 36 and a meniscus lens 37 convex toward the image end.

[0041] The exit pupil position ex of the system is -37.6304 mm, the lens back focal length bf is 31.0 mm, the focal length f of the zoom projection lens at the wide-angle end W Is 21.05041 mm, the first lens group 1 focal length f 1 Is -51.6057 mm, the second lens group 2 focal length f 2 Is 52.8869 mm, the focal length f o...

Example

[0052]

[0053] Table 2-1 shows various parameters of the second specific embodiment of the zoom projection lens. In the second specific embodiment, the convex lens 13 of the first lens group 1 is a biconvex lens 13 (biconvex), the second lens group 2 includes two glass spherical lunar lenses 21, and the third lens group 3 is The mutually bonded negative lens 31, the positive lens 32 and the aspheric lens 33 further include the aperture stop 34, the spherical biconvex lens 35', and the spherical biconcave lens 36'.

[0054] The exit pupil position ex of the system is -42.0 mm, the rear focal length bf of the lens is 31.0 mm, and the focal length f of the zoom projection lens at the wide-angle end W 20.6285 mm, the focal length of the first lens group 1 f 1 Is -46.3177 mm, the focal length of the second lens group 3 f 2 Is 33.9912 mm, the focal length f of the aspheric lens 11 in the first lens group 1 L1 Is -91.7393 mm, the focal length f of the aspheric lens 33 in the third lens ...

Example

[0059]

[0060] Table 3-1 shows various parameters of the third specific embodiment of the zoom projection lens. In the third specific embodiment, the convex lens 13 of the first lens group 1 is a plano-convex lens 13 protruding toward the object end, the second lens group 2 includes a glass spherical plano-convex lens 21 in number, and the third lens group 3 A spherical biconvex lens 35", the aperture stop 34, a spherical lunar convex lens 36" convex toward the object end, and a spherical biconcave lens 37 are also included between the mutually bonded negative lens 31, the positive lens 32 and the aspheric lens 33. ".

[0061] The exit pupil position ex of the system is -41.737 mm, the rear focal length bf of the lens is 31.0 mm, and the focal length f of the zoom projection lens at the wide-angle end W 23.4058 mm, the focal length of the first lens group 1 f 1 Is -48.0972 mm, the second lens group 2 focal length f 2 Is 50.4457 mm, the focal length f of the aspheric lens 11 in t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a zooming projection lens for a projection machine. The zooming projection lens comprises a first lens set, a second lens set and a third lens set, which are sequentially arranged from an object side to an image side; the first lens set, the second lens and the third lens set are respectively of negative refractive index, positive refractive index and positive refractive index; the first lens set comprises an aspherical lens; and the third lens set comprises an aspherical lens and an aperture diaphragm. According to the zooming projection lens for the protection machine provided by the invention, the relative aperture of the zooming projection lens is reduced, and the relative aperture of the zooming projection lens at the wide angle side is less than 2.1, on the other hand, the diameter of the aperture diaphragm is increased, so that the luminous efficiency of the projection machine is improved, and moreover, the aspherical lens is utilized, so that the lens aberration due to the widening of the aperture diaphragm is reduced.

Description

technical field [0001] The invention relates to a zoom projection 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 been gradually replaced by thinner, lighter and smaller projection devices such as Liquid Crystal Displays (Liquid Crystal Displays) and Digital Light Processing projection devices (Digital Light Processing, DLP). [0003] Wherein, the chief ray (chiefray) 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 omitted compared with the zoom projection lens of the telecentric system. A total internal reflection prism 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 projectio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02B15/177G02B3/00G02B1/00G02B1/04
Inventor 李赞桦
Owner ASIA OPTICAL CO INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap