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Projection lens group

A technology of projection lens and lens, which is applied in the field of projection lens group, can solve the problems of high power consumption, high price of projection equipment, complex optical path design of the number of lenses, etc., and achieve high imaging quality

Pending Publication Date: 2020-07-28
ZHEJIANG SUNNY OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the projection lens sets used in the market currently have a large number of lenses and complex optical path design.
Moreover, it will also lead to high price, large volume, high power consumption, and inconvenient portability of the projection equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Refer to the following Figure 1 to Figure 2B A projection lens group according to Embodiment 1 of the present application will be described. figure 1 A schematic structural diagram of the projection lens group according to Embodiment 1 of the present application is shown.

[0071] Such as figure 1 As shown, the projection lens group includes in order from the imaging side to the image source side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5 and image source surface S11 .

[0072]The first lens E1 has a positive refractive power, its side S1 near the image is convex, and the side S2 near the image source is concave. The second lens E2 has a positive refractive power, its image-near side S3 is convex, and its near-image source side S4 is concave. The third lens E3 has a negative refractive power, its image-near side S5 is convex, and its near-image source side S6 is concave. The fourth lens E4 has a positive refractive power...

Embodiment 2

[0085] Refer to the following Figure 3 to Figure 4B A projection lens group according to Embodiment 2 of the present application will be described. In this embodiment and the following embodiments, for the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted. image 3 A schematic structural diagram of a projection lens group according to Embodiment 2 of the present application is shown.

[0086] Such as image 3 As shown, the projection lens group includes in order from the imaging side to the image source side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5 and image source surface S11 .

[0087] The first lens E1 has a positive refractive power, its side S1 near the image is convex, and the side S2 near the image source is concave. The second lens E2 has a positive refractive power, its image-near side S3 is convex, and its near-image source side S4 is concave. The third lens E3 has a positive refractive ...

Embodiment 3

[0097] Refer to the following Figure 5 to Figure 6B The projection lens group according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of a projection lens group according to Embodiment 3 of the present application is shown.

[0098] Such as Figure 5 As shown, the projection lens group includes in order from the imaging side to the image source side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5 and image source surface S11 .

[0099] The first lens E1 has a positive refractive power, its side S1 near the image is convex, and the side S2 near the image source is concave. The second lens E2 has a negative refractive power, its image near side S3 is concave, and its near image source side S4 is convex. The third lens E3 has a positive refractive power, its image near side S5 is convex, and its near image source side S6 is convex. The fourth lens E4 has a positive refractive power, i...

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PUM

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Abstract

The invention discloses a projection lens group. The projection lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an imaging side to an image source side along an optical axis, the first lens has positive focal power; the second lens has focal power; the third lens has focal power, and the near imaging side surface of the third lens isa convex surface; the fourth lens has focal power, and the near imaging side surface of the fourth lens is a convex surface; the fifth lens has negative focal power, and the side surface, close to the imaging side, of the fifth lens is a concave surface; at least one of the first to fourth lenses is a glass lens; the distance TTL from the image source surface of the projection lens group to the near imaging side surface of the first lens on the optical axis meets the following condition: TTL < 4.8 mm; and the effective focal length f1 of the first lens and the effective focal length f3 of thethird lens satisfy the relational expression shown in the description.

Description

technical field [0001] The present application relates to the field of optical elements, in particular, to a projection lens set. Background technique [0002] With the continuous upgrading of imaging technology, more and more customers are beginning to favor miniaturized and portable micro-projection equipment. However, the projection lens sets used in most projection devices currently on the market have a large number of lenses and a relatively complicated optical path design. Moreover, the projection device will also result in high price, large volume, high power consumption, and inconvenient portability. [0003] How to reasonably allocate the focal power and surface characteristics of each lens in the projection lens group and design the key technical parameters of the projection lens group to obtain a projection lens group with characteristics such as miniaturization, portability, high quality, and high resolution is One of the problems that many lens designers need ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G03B21/14
CPCG02B13/0045G02B13/18G03B21/14
Inventor 龚停停宋立通戴付建赵烈烽
Owner ZHEJIANG SUNNY OPTICAL CO LTD