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Image pickup optical system

An imaging optical system and a technology for optical systems, which are applied in optics, optical components, printing devices, etc., can solve problems such as difficulty in obtaining images

Inactive Publication Date: 2007-11-28
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain an image focused on a wide area of ​​the subject when using an imaging optical system in which the central beam is incident almost vertically (to be described later) on the image plane

Method used

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Examples

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Embodiment 1

[0038] Embodiment 1 ( FIG. 1 ) explained a case where an image of a predetermined region of an object plane (surface) 2 a of an object 2 to be imaged is captured at an imaging angle α by the imaging optical system PL.

[0039] As described above, the imaging angle α is the angle formed between the imaging object plane 2 a and the axis 4 perpendicular to the final image plane 6 .

[0040] In Embodiment 1, the shooting angle α is a low angle equal to or smaller than 20°.

[0041] In Example 1, the principal plane 1 a of the first optical system 1 of the imaging optical system PL is inclined with respect to the final image plane 6 . That is, the main plane 1a of the first optical system 1 is inclined with respect to the final image plane 6 such that the final image plane 6 of the final image plane 6 of the second optical system 5 and the object plane 3 become parallel to each other.

[0042] Reference symbol θ2 denotes an inclination angle formed between the final image plane 6 ...

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Abstract

Provided is an image pickup optical system capable of performing focusing in a wide region without a large increase in tilt angle in the case where an image of an object is picked up from a low angle. The image pickup optical system includes a first optical system and a second optical system, for enlarging an image formed by the first optical system and forming the enlarged image. A principal plane of the first optical system is tilted relative to an image plane of the second optical system.

Description

technical field [0001] The present invention relates to an imaging optical system suitable for capturing an image of a subject (observation subject) from a low angle. Background technique [0002] When an image of a subject is taken from a low angle close to an angle corresponding to the surface of the subject, that is, from an oblique direction, an image of an uneven surface of the subject can be taken with high precision. [0003] This is because the object is observed with the influence of the substance constituting the object and the degree of unevenness increased due to the polarization state and the like when the object is viewed from an oblique direction. [0004] An oblique imaging optical system is known as an imaging system suitable for performing imaging while the entire imaging surface inclined in the direction of the optical axis of the imaging system is brought into focus. This camera principle was discovered by Scheimpflug. The optical system is also called ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B17/54G02B27/00
CPCG03B5/06G02B27/0025
Inventor 齐藤谦治吉川博志齐藤贤一
Owner CANON KK