Unlock instant, AI-driven research and patent intelligence for your innovation.

Variable power optical system and imaging device

An optical system, image-side technology, applied in optics, optical components, components of TV systems, etc., to achieve the effect of high optical performance

Inactive Publication Date: 2014-04-16
FUJIFILM CORP
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional optical system, it is difficult to achieve high optical performance that can cope with the increase in pixels in recent years while maintaining the large aperture and high zoom ratio required for surveillance camera applications with a compact and inexpensive structure.

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
  • Variable power optical system and imaging device
  • Variable power optical system and imaging device
  • Variable power optical system and imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] The lens sectional view of embodiment 1 is in figure 1 The diagram shown, its brief structure is shown below. The variable power optical system of Embodiment 1 is as follows in order from the object side: the first lens group G1 is a meniscus-shaped negative lens L1 with a convex surface facing the object side, a meniscus-shaped positive lens L2 with a convex surface facing the image side, A three-element structure of biconcave negative lens L3 in the paraxial region, the second lens group G2 is a meniscus positive lens L4 with a convex surface facing the object side in the paraxial region, and a biconvex positive lens L5, a meniscus-shaped negative lens L6 with a convex surface facing the object side, and a biconvex-shaped positive lens L7. In addition, all the lenses are unbonded single lenses, and aspheric surfaces are applied to both sides of the lens L3. surface and the surfaces on both sides of lens L4.

[0092] Table 1 shows the lens data of the variable power ...

Embodiment 2

[0120] The lens sectional view of embodiment 2 is such as figure 2 shown. The brief structure of the variable power optical system of the second embodiment is the same as that of the first embodiment. Table 4 shows the lens data of the variable power optical system of Example 2, Table 5 shows the aspheric surface data, and Table 6 shows various data.

[0121] [Table 4]

[0122] Example 2 lens data

[0123] Si

Ri

Dj

Ndj

νdj

1

27.3739

0.80

1.88300

40.8

2

5.6834

3.87

3

-18.0443

2.33

1.92286

18.9

4

-10.2525

0.14

5*

-12.8729

0.80

1.69350

53.2

6*

2067.8768

Variable 1

7 (aperture stop)

-

Variable 2

8*

9.4565

2.16

1.69350

53.2

9*

44.6996

0.10

10

13.5836

4.19

1.4970...

Embodiment 3

[0136] The lens sectional view of embodiment 3 is such as image 3 shown. The brief structure of the variable power optical system of the third embodiment is the same as that of the first embodiment. The lens data of the variable power optical system of Example 3 are shown in Table 7, the aspheric surface data are shown in Table 8, and various data are shown in Table 9.

[0137] [Table 7]

[0138] Embodiment 3 lens data

[0139] Si

Ri

Di

Ndj

νdj

1

28.3814

0.81

1.88000

40.0

2

5.8426

3.69

3

-26.4140

2.28

1.87611

21.1

4

-11.3533

0.20

5*

-20.2351

0.86

1.49783

60.5

6*

16.0522

Variable 1

7 (aperture stop)

-

Variable 2

8*

8.2208

1.43

1.50035

54.9

9*

16.6596

0.10

10

10.6190

...

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 present invention provides a variable power optical system and an imaging device. The variable power optical system has a middle or small shape and is manufactured with a low cost. While a large aperture ratio and high zoom ratio are kept, high optical performance with high quality image can be obtained. The variable power optical system is provided with the following components successively from an objective side: a first lens group (G1) with negative refractive power, a diaphragm, and a second lens group (G2) with positive refractive power. The structure of the variable power optical system is characterized in that: zooming is performed through interval change in the optical axis direction of the first lens group (G1) and the second lens group (G2), and the image surface position correction along with zooming is performed through moving the first lens group (G1) along an optical axis direction. The first lens group (G1) is successively provided with the following components from the objective side: a negative lens (L1), a positive lens (L2) and a negative lens (L3), wherein the three lenses form a three-sheet structure. The variable power optical system satisfies a conditional expression (1) which is related with a lens surface (S6) at an image side of the negative lens (L3) of the first lens group (G1).

Description

technical field [0001] The present invention relates to a variable magnification optical system and an imaging device. More specifically, it relates to a variable magnification optical system that can be used in a photographic camera or an electronic still life camera, and is especially suitable for use as a surveillance camera, and a device equipped with the variable magnification optical system. camera device. Background technique [0002] Surveillance cameras have traditionally been used for crime prevention and recording purposes. An optical system for such a surveillance camera is required to be compact and inexpensive, to have a large aperture ratio so that a subject can be specified even under low-illuminance imaging conditions, and to have high optical performance. In addition, due to the growing demand for surveillance cameras with zoom functions in recent years, zoom optical systems have gradually become mainstream. [0003] As variable power optical systems that...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/177H04N5/225
Inventor 富冈右恭
Owner FUJIFILM CORP