Miniature zoom lens

• US 8,605,371 B2
• Filed: 06/10/2011
• Issued: 12/10/2013
• Est. Priority Date: 12/12/2008
• Status: Expired due to Fees

• Current Assignee: Qioptiq Photonics GmbH & Company KG (Excelitas Technologies Holdings LLC)
• Original Assignee: Qioptiq Photonics GmbH & Company KG (Excelitas Technologies Holdings LLC)
• Inventors: Hackemer, Witold
• Primary Examiner(s): Martinez, Joseph P
• Application Number:
  US13/158,159
• Publication Number:
  US 20110299176A1
• Time in Patent Office: 914 Days
• Field of Search: 359/684, 359/781
• US Class Current: 359/781
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• CPC Class Codes: G02B 13/009 having zoom function
• CPC Class Codes: G02B 15/144513 arranged --++
• CPC Class Codes: G02B 15/177 having a negative front lens or group of lenses

Abstract

A Miniature zoom lens, in particular for use in mobile telephones, in which the zoom lens, as viewed from the object plane, has the following in the stated sequence: at least one negative first optical lens group, at least one negative second optical lens group, at least one positive third optical lens group, and at least one positive fourth optical lens group. The second, third, and fourth optical lens groups are configured in such a way that focusing is achieved solely by displacement of the fourth optical lens group, and during the focusing the positions of the second and third lens groups remain unchanged.

Claims

1. Miniature zoom lens, comprising:

a) the zoom lens, as viewed from the object plane, includes at least the following in the stated sequence;

i) one negative first optical lens group;

ii) one negative second optical lens group;

iii) one positive third optical lens group; and

iv) one positive fourth optical lens group;

b) the first optical lens group being a stationary lens group;

c) the second, third, and fourth optical lens groups being configured in such a way that focusing is achieved solely by displacement of the fourth optical lens group, and during the focusing the positions of the second and third lens groups remain unchanged;

d) the second, third and fourth optical lens groups being configured in such a way that a change in focal length is achieved solely by displacement of the second and third optical lens groups and during the change of the focal length the position of the fourth optical lens group remains unchanged;

e) the lens has a zoom factor which is >

2.0; and

f) a ratio of the partial overall length of the lens and of the image diagonals is ≦

3.5.

2. Zoom lens according to claim 1, wherein:

a) the ratio of the partial overall length of the lens and of the image diagonals is approximately 3.3.

3. Zoom lens according to claim 1, wherein:

a) the zoom factor is ≧

2.5 and ≦

2.8.

4. Zoom lens according to claim 1, wherein:

a) the zoom factor is 2.52.

5. Miniature zoom lens, comprising:

a) the zoom lens, as viewed from the object plane, includes at least the following in the stated sequence;

i) one negative first optical lens group;

ii) one negative second optical lens group;

iii) one positive third optical lens group; and

iv) one positive fourth optical lens group;

b) the first optical lens group being a stationary lens group;

c) the second, third, and fourth optical lens groups being configured in such a way that focusing is achieved solely by displacement of the fourth optical lens group, and during the focusing the positions of the second and third lens groups remain unchanged;

d) the second, third and fourth optical lens groups being configured in such a way that a change in focal length is achieved solely by displacement of the second and third optical lens groups and during the change of the focal length the position of the fourth optical lens group remains unchanged; and

e) the first optical lens group, the second optical lens group, the third optical lens group, and the fourth optical lens group are configured as set forth in accordance with the following

6. Miniature zoom lens, comprising:

a) the zoom lens, as viewed from the object plane, includes at least the following in the stated sequence;

i) one negative first optical lens group;

ii) one negative second optical lens group;

iii) one positive third optical lens group; and

iv) one positive fourth optical lens group;

b) the first optical lens group being a stationary lens group;

c) the second, third, and fourth optical lens groups being configured in such a way that focusing is achieved solely by displacement of the fourth optical lens group, and during the focusing the positions of the second and third lens groups remain unchanged;

d) the second, third and fourth optical lens groups being configured in such a way that a change in focal length is achieved solely by displacement of the second and third optical lens groups and during the change of the focal length the position of the fourth optical lens group remains unchanged; and

e) the first optical lens group, the second optical lens group, the third optical lens group, and the fourth optical lens group are configured as set forth in accordance with the following surface data detail;