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Imaging lens, imaging equipment and information device

An imaging lens and lens technology, applied in the direction of optical components, optics, instruments, etc., can solve the problem of lens length becoming longer

Active Publication Date: 2016-01-13
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in a back focus type optical system using a wide-angle lens as an interchangeable lens in a single-lens reflex camera, just as it is clear that a back focus type optical system is used for stabilization of the back focus distance, the overall lens length (from the surface on the most object side to the image side) tends to be longer

Method used

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  • Imaging lens, imaging equipment and information device
  • Imaging lens, imaging equipment and information device
  • Imaging lens, imaging equipment and information device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0146] figure 1 is a vertical sectional view along the optical axis illustrating the lens configuration of the imaging lens according to Example 1 of the embodiment of the present invention.

[0147] That is, if figure 1 As shown, the optical system of the imaging lens of Example 1 includes: first lens L1, second lens L2, third lens L3, fourth lens L4, diaphragm AD, fifth lens L5, sixth lens L6 and seventh lens L7, they are arranged sequentially from the object side to the image side. The third lens L3 and the fourth lens L4, the fifth lens L5 and the sixth lens L6 are respectively formed as cemented lenses. The optical system of the imaging lens in Example 1 has a so-called 5-group 7-element configuration.

[0148] In terms of the configuration of the lens group, the first lens L1 to the fourth lens L4 are included in the first lens group G1 as the front lens group, which has positive refractive power, and the fifth lens L5 to the seventh lens L7 are included in the rear a...

example 2

[0198] image 3 is a vertical sectional view along the optical axis illustrating the lens configuration of the imaging lens according to Example 2 of the embodiment of the present invention.

[0199] That is, if image 3 As shown, the optical system of the imaging lens of Example 2 includes first lens L1, second lens L2, third lens L3, diaphragm AD, fourth lens L4, fifth lens L5 and The sixth lens L6. The fourth lens L4 and the fifth lens L5 are formed as a cemented lens, and the optical system of the imaging lens of Example 2 has a so-called 5-group 6-element configuration.

[0200] In terms of the configuration of the lens group, the first lens L1 to the third lens L3 are included in the first lens group G1 as the front lens group, which has positive refractive power, and the fourth lens L4 to the sixth lens L6 are included in the rear lens group. In the second lens group G2, it has positive refractive power.

[0201] That is to say, image 3 The illustrated optical sys...

example 3

[0242] Figure 5 is a vertical sectional view along the optical axis, illustrating the lens configuration of the imaging lens in Example 3 of the embodiment of the present invention.

[0243] That is, if Figure 5 As shown, the optical system of the imaging lens in Example 3 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture AD, and a fifth lens L5 arranged in sequence from the object side to the image side , the sixth lens L6 and the seventh lens L7.

[0244] The third lens L3 and the fourth lens L4 and the fifth lens L5 and the sixth lens L6 are each formed as a cemented lens. The optical system of the imaging lens of Example 3 has a so-called 5-group 7-element configuration.

[0245] In terms of the configuration of the lens groups, the first lens group G1 as the front lens group includes the first lens L1 to the fourth lens L4 with positive refractive power, and the second lens group G2 as the rear lens group includes the fifth le...

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PUM

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Abstract

An imaging lens including a plurality of lenses, wherein two lenses arranged adjacent to and separated from each other, a surface on the image side of the lens on the object side and a surface on the object side of the lens on the image side, transverse Facing each other across an air space, which is called an air lens, defines the shape of the air lens so that the surface on the image side of the lens on the object side is taken as the surface on the object side of the air lens, and the lens on the image side The surface on the object side of is taken as the surface on the image side of the air lens, and both the air lens on the most object side and the air lens on the most image side have biconvex shapes.

Description

technical field [0001] The present invention relates to an improvement of a single-focus imaging lens for forming images of subjects in various cameras including so-called silver halide cameras (in particular, digital cameras, video recorders, etc.). In particular, the present invention relates to an imaging lens suitable for an imaging optical system used in an imaging device using an electronic imaging device as a digital camera or a digital video camera, an imaging device such as a camera using such an imaging lens, and an imaging device having an imaging function , Information devices such as portable information terminal devices. Background technique [0002] The market for so-called digital cameras that acquire digital image data of a subject using a solid-state image sensor has grown dramatically, and there are also various demands from users for such digital cameras. [0003] First, such a compact camera with high image quality including a relatively large image sen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00
CPCG02B13/0045G02B13/0015
Inventor 大桥和泰
Owner RICOH KK