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Picture taking apparatus having focusing device

Inactive Publication Date: 2003-08-21
OLYMPUS OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accordingly, with digital cameras, time to move the photographing lens is needed and this so-called release time lag may become long.
Consequently, repeating focusing takes time and delays photography.
This delay may become unacceptable particularly if the hill-climbing auto-focusing method is used.

Method used

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  • Picture taking apparatus having focusing device
  • Picture taking apparatus having focusing device
  • Picture taking apparatus having focusing device

Examples

Experimental program
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Embodiment Construction

[0031] A first example will be described below with reference to FIGS. 1 to 5.

[0032] FIG. 1 is a block diagram showing components of a camera according to a first example.

[0033] Referring to FIG. 1, a CPU 1 is an arithmetic and control section composed of a one-chip microcomputer and the like. Connected to this CPU 1 are a photographing lens driver (LD) 7 for driving a photographing lens 2, an image processing unit(e.g., circuit) 4 and a focus determining unit (e.g., circuit) 5, an image pickup element 3 which receives a photographing light beam entering through the photographing lens 2, a memory 6 which is a storage section, an LCD driver 9 for driving an LCD 8 which is an image display section, and an electronic flash 10. The image processing circuit 4 and the focus determining circuit 5 are each supplied with the output from the image pickup element 3. Incidentally, the image pickup element 3 may use, for example, an area sensor.

[0034] A release switch (button) 13, a mode changin...

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PUM

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Abstract

A plurality of distance measuring points in a picture can be correctly and rapidly focused on. Images at a plurality of distance measuring points in the picture can be detected through a photographing lens by means of an image pickup element. These detected distance measuring points can be displayed on a monitor screen. Finally, a photographing lens can be controlled with respect to the displayed distance measuring points so as to cause the output from the image pickup element to reach its highest contrast.

Description

[0001] This application claims benefits of Japanese Patent Application No. 2002-41,823, filed on Feb. 19, 2002, in Japan, the contents of which are hereby incorporated by reference.[0002] 1. Field of the Invention[0003] This invention relates to a picture taking apparatus, such as cameras, having a focusing device, and more particularly, to digital cameras.[0004] 2. Description of the Related Art[0005] A digital camera has image pickup means for electrically detecting an image of a subject through a photographing lens. It is widely known that digital cameras perform focusing using an image signal outputted from the image pickup means. This auto focus technology finely adjusts the focus of the photographing lens to find a lens position where the contrast of an image becomes highest. Accordingly, with digital cameras, time to move the photographing lens is needed and this so-called release time lag may become long. This type of focusing technology in which the photographing lens is co...

Claims

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Application Information

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IPC IPC(8): G02B7/28G03B13/36G02B7/36G03B17/18H04N5/225H04N5/232H04N101/00
CPCH04N5/23212H04N23/673H04N23/634
Inventor NONAKA, OSAMU
Owner OLYMPUS OPTICAL CO LTD