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High polymer optical low-pass filter and its manufacturing method and digital camera

A low-pass filter and polymer technology, applied in cameras, optics, optical components, etc., can solve problems such as uniform orientation and difficult liquid crystal

Inactive Publication Date: 2004-05-19
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, when forming an optical low-pass filter by obliquely aligning liquid crystals, it is difficult to accurately align the orientation direction to a desired direction because the orientation is performed by grinding or the like.
In addition, due to the sufficient thickness, there is also the disadvantage that it is difficult to align the liquid crystal uniformly.

Method used

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  • High polymer optical low-pass filter and its manufacturing method and digital camera
  • High polymer optical low-pass filter and its manufacturing method and digital camera
  • High polymer optical low-pass filter and its manufacturing method and digital camera

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Embodiment Construction

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 It is an explanatory diagram of an embodiment of the digital camera of the present invention, and shows a schematic configuration cross-sectional view of a single-lens Leif digital camera with an interchangeable lens. An interchangeable lens 3 is attached to the lens frame 2 of the digital camera 1 . The photographic light beam L that has passed through the photographic lens 4 of the interchangeable lens 3 is incident on the main mirror 5 a of the fast retroreflective mirror 5 . The main reflector 5a is composed of a half mirror, and the light beam L is split into two light beams L1 and L2 by the main reflector 5a. The light beam L2 reflected by the main mirror 5 a is imaged on the inspection mirror 6 . Through the pentaprism 7 and the eye lens 8 , the subject image formed on the inspection mirror 6 can be observed from the image inspection eye window 9 . Part...

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Abstract

A high-polymer optical low-pass filter is produced by cutting out of a high polymer material achieving optical anisotropy diagonally relative to an optic axis thereof.

Description

technical field [0001] The invention relates to a polymer optical low-pass filter, a manufacturing method of the polymer optical low-pass filter and a digital camera with the polymer optical low-pass filter. Background technique [0002] Electronic imaging devices such as digital still cameras and video cameras capture subject images using solid-state imaging elements such as CCD elements and MOS elements. The photosensitive pixels in this imaging element are regularly arranged, so it is easy to produce moiré fringes and false colors according to the arrangement pattern of photosensitive pixels and the pattern of the subject image. Usually, in order to eliminate these influences, an optical low-pass filter is provided in front of the imaging element. [0003] As an optical low-pass filter, for example, crystal and lithium niobate (LiNbO 3 ) filter. This utilizes the refractive index ellipsoid structure of crystals, and utilizes the birefringence generated by inclining the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B27/46G02F1/13G03B11/00G03B19/02H04N5/225
CPCG02B5/3083H04N5/2254
Inventor 岩根透松原隆
Owner NIKON CORP