Imaging optical system

A technology of imaging optics and optical surfaces, applied in optics, optical components, lenses, etc., can solve problems such as difficult processing and difficulty in realizing automated mass production rates

Inactive Publication Date: 2008-07-30
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This creates difficulties in handling when assembling
This poses a problem that it is difficult to automate and increase mass production rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] FIG. 1 is a schematic sectional view showing the structure of an imaging optical system 1 according to Embodiment 1. As shown in FIG. Figure 1 shows an example of an imaging optical system suitable for wide-angle image capture with constant focal length. The imaging optical system 1 is held by a lens barrel 6 . The light beams 5 a , 5 b , 5 c are light beams passing through the imaging optical system 1 . The light beam 5 c is a light beam passing through at the maximum viewing angle of the imaging optical system 1 .

[0048] FIG. 2 is an enlarged view of the lens element 2 located on the most object side among the lens elements employed in the imaging optical system 1 shown in FIG. 1 . In FIG. 2 , the lens element 2 is at least a part of a peripheral region (hereinafter simply referred to as a “peripheral region”) around a central region (hereinafter simply referred to as a “central region”) including the center (near the center) of the object-side optical surface. w...

Embodiment 2

[0097] In Example 1, an antireflection multilayer film was formed in the central region of the lens element located on the most object side, while an antireflection structure was formed in the peripheral region. Here, an antireflection multilayer film may be formed to cover the entire surface of the lens element, and then an antireflection structure is formed thereon.

[0098] The basic structure of the imaging optical system according to the present Embodiment 2 is similar to that of the imaging optical system according to Embodiment 1. In this way, reference is made to the structure of the imaging optical system of FIG. 1 . Here, the lens element 2 in FIG. 1 is replaced by the lens element 12 shown in FIG. 10 in this Embodiment 2. As shown in FIG.

[0099] FIG. 10 is an enlarged view of the lens element 12 employed in the imaging optical system according to Embodiment 2. As shown in FIG. In FIG. 10 , the antireflection multilayer film 14 is formed to cover the entire surfa...

Embodiment 3

[0103] The basic structure of the imaging optical system according to the present Embodiment 3 is similar to that of the imaging optical system according to Embodiment 1. However, in the lens element located on the most object side, the configuration of the antireflection structure provided in at least a part of the peripheral region of the object side optical surface is different from that in Embodiment 1.

[0104] 11 is a partially enlarged sectional view of the lens element 22 employed in the imaging optical system according to Embodiment 3. As shown in FIG. The lens element 22 corresponds to the lens element 2 shown in FIG. 1 , and is a lens element located on the most object side of the imaging optical system 1 of FIG. 1 . As shown in FIG. 11 , a sheet 25 having an antireflection structure 23 is adhered in at least a part of the peripheral region of the substrate 24 constituting the lens element 22 and is composed of, for example, a material capable of absorbing incident ...

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Abstract

An imaging optical system is provided with an optical plane, which at least includes one lens element and transmits an incoming light; and a reflection preventing structure, which is arranged at least at a section in a peripheral area around a center area which includes a center of the optical plane, on one or more optical planes. In the reflection preventing structure, structural units having a prescribed shape are periodically arranged in array at a pitch smaller than the shortest wavelength of light to be prevented from being reflected among the incoming light. The imaging optical system has a sufficiently suppressed reflectance on the optical plane, is easily handled and is excellent in mass productivity.

Description

technical field [0001] The present invention relates to imaging optical systems. In particular, the present invention relates to an imaging optical system in which reflectance on an optical surface is suppressed while handling is easy and satisfactory mass productivity can be obtained. This imaging optical system is applicable to various imaging devices such as digital cameras and the like. Background technique [0002] In recent years, the market capacity of digital cameras has shown an increasing trend. In general, the market for digital cameras is broadly divided into those targeting high magnification and high resolution and those targeting compact digital cameras. On the other hand, in order to further expand the digital camera market, a market cultivation campaign for a new market targeting wide-angle digital cameras is underway. [0003] In an imaging optical system such as a zoom lens system for a high-magnification camera, a half-moon lens with strong negative po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/11G02B1/02G02B1/115G02B1/118G02B13/00
CPCG02B1/11G02B1/118G02B3/0006G02B3/0056G02B5/001G02B5/045
Inventor 冈山裕昭吉川智延吉次庆记山本义春
Owner PANASONIC CORP
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