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Optical device and beam splitter

By designing a tilt-angle beam splitter and gain adjuster in the camera, the problems of uneven brightness and underexposure in the existing technology are solved, and high-quality image shooting and focus detection accuracy are achieved.

Inactive Publication Date: 2007-02-28
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the brightness unevenness can be eliminated to some extent, the amount of light used for focus detection becomes insufficient, resulting in insufficient focus detection accuracy for objects with low brightness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 1 to 25 are diagrams related to a digital color camera (optical device) of Embodiment 1 of the present invention.

[0062] First, FIG. 1 is a cross-sectional view showing a state in which focus detection is performed and an image of an EVF (Electronic Viewfinder) is taken. In FIG. 1, reference numeral 101 denotes a digital color camera body, 102 denotes an imaging optical system, 104 denotes an optical axis of the imaging optical system 102, and 105 denotes a lens barrel accommodating the imaging optical system 102. The imaging position of the imaging optical system 102 can be adjusted along the direction of the optical axis 104 by a driving source and a driving mechanism (not shown in the figure). The focusing of the object can be performed by changing the interface shape and refractive index of a focusing lens made of a transparent elastic member having elasticity or composed of a liquid lens. The imaging optical system 102 may be composed of a single lens, a zoom lens, a...

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PUM

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Abstract

An optical apparatus is disclosed, which can take high-quality images by using light transmitted through a beam splitter. The optical apparatus comprises a light-receiving element and a beam splitter. The first surface of the beam splitter reflects part of incident light and transmits the other part of the incident light toward the light-receiving element. The second surface transmits other incident light other than the incident light to the first surface toward the light-receiving element. The transmittance of the second surface is set so that a light amount distribution on the light-receiving element may be substantially even in a case where the light is incident to the first and second surfaces from an object having a substantially even luminance.

Description

Technical field [0001] The present invention relates to an optical device such as a camera, and particularly to an optical device having an optical structure in which the optical path of a light beam acquired by an imaging optical system is divided into a plurality of optical paths, and these optical paths are guided to a light receiving element, and to The beam splitter used. Background technique [0002] Patent Document 1 discloses a single-lens reflex digital camera in which an optical object image formed by an imaging optical system is formed on a two-dimensional light receiving sensor such as a CCD sensor or a CMOS sensor, and the object is obtained by photoelectric conversion of the optical image The image output. [0003] A beam splitter is built into the SLR digital camera. This beam splitter transmits light in the visible wavelength range without reducing the amount of light, and separates light with a wavelength close to the infrared range. The light having a wavelength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/04G02B7/34G02B27/46G03B13/36G03B7/08G03B17/18H01L27/00H01L27/146H04N25/00
CPCH01L27/14625G03B7/08H04N5/2254G02B7/34G02B27/16G03B17/18G02B27/143H04N23/55H10F39/806G02B27/10
Owner CANON KK
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