Two-focal-distance lens series and portable mechanism with same

A dual focal length, dual focus lens technology, applied in the direction of lens, optics, instruments, etc., can solve the problem of the overall length of the optical system becoming longer, unsuitable for portable machinery, etc., to achieve the effect of ensuring the performance of the incident angle

Inactive Publication Date: 2007-06-13
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, since it is necessary to ensure the distance of moving the lens group, the overall length of the optical system will become longer, so it is not suitable for the configuration of portable machines.

Method used

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  • Two-focal-distance lens series and portable mechanism with same
  • Two-focal-distance lens series and portable mechanism with same
  • Two-focal-distance lens series and portable mechanism with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0091] Regarding Examples 1 to 5, the total length of the optical system (however, the portion parallel to the plane glass is changed to an air-converted distance) is considered as the sum of d (interface distances), as shown in Table 2.

[0092] Table 2

[0093] full length

wide

tele

first embodiment

5.67

7.86

second embodiment

5.97

8.29

third embodiment

6.13

8.17

Fourth embodiment

5.86

7.94

fifth embodiment

5.49

7.99

[0094] It can also be seen from Table 2 that no matter whether it is the wide-angle side or the telephoto side, it must be of an appropriate size to be loaded on the mobile phone.

[0095] table 3

[0096] Example 1

wide

20.9°

tele

15.7°

Example 2

wide

21.0°

tele

18.3°

Example 3

wide

21.7°

tele

16.8°

Examp...

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PUM

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Abstract

The invention relates to a bifocal lens series. In the bifocal lens series with two different focal lengths, because of the first lens group G1, wide angle side second lens group G2w, telescope side lens group G2t, the focal length would be changed by selectively equipping one from G2w and G2t. The focal length of first lens group is f1, and the focal length of lens at wide angle is fw, it meets the condition of 1.0 G02B 3/10 G02B 13/18 G02B 1/04 19 9 1 2005/12/5 1979223 2007/6/13 000000000 Dali Photoelectric Co., Ltd. Taiwan Nota Omoai wangmeng xia yuchang hua 11223

Description

technical field [0001] The present invention relates to a bifocal lens system capable of switching the focal length between the wide-angle side and the telephoto side and a portable machine incorporating the lens system. Background technique [0002] In recent years, mobile phones (an example of a portable machine) have a mechanism equipped with a camera function. The portable machine uses a camera lens group (optical system) and a CCD (image sensor) to perform camera operations. At the same time, the photographic lens group is no longer a single focus, but must have an optical zoom function with a convertible focal length. However, optical zoom is in conflict with the thinning required for portable devices, and there are many problems to be solved in terms of lens driving and cost. [0003] Here, the present invention is not an optical zoom, but a bifocal lens group that can switch between the telephoto side and the wide-angle side according to the focal length. The paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/10G02B13/18G02B1/04
Inventor 野田小百合
Owner LARGAN PRECISION
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