JPS62188719U

JPS62188719U -

Info

Publication number: JPS62188719U
Application number: JP7753286U
Authority: JP
Priority date: 1986-05-22
Filing date: 1986-05-22
Publication date: 1987-12-01

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の概略構成図、第２
図は前ピンにおける結像状態を示す図、第３図は
合焦における結像状態を示す図、第４図は後ピン
における結像状態を示す図、第５図は第１図の実
施例の動作説明に供するフローチヤートである。１……撮影レンズ、５……オートフオーカス用
の撮像素子、６……導光手段、７，８……第１、
第２レベル検出手段、９……比較手段。 Figure 1 is a schematic diagram of an embodiment of the present invention;
The figure shows the image formation state in front focus, Figure 3 shows the image formation state in focus, Figure 4 shows the image formation state in rear focus, and Figure 5 is an example of the embodiment shown in Figure 1. This is a flowchart for explaining the operation. DESCRIPTION OF SYMBOLS 1... Photographing lens, 5... Image pickup element for autofocus, 6... Light guiding means, 7, 8... First,
Second level detection means, 9...comparison means.

Claims

[Scope of Utility Model Registration Claim] An image sensor for autofocus, which splits the light incident on the photographic lens from the subject,
a light guiding means that separates the light into long wavelength light and short wavelength light and guides the light to the imaging device using an imaging lens; detecting the level of a high frequency component of a video signal corresponding to the long wavelength light from the imaging device; a first level detection means for detecting the level of a high frequency component of a video signal corresponding to the short wavelength light from the image sensor; and a comparison means for comparing the outputs of both the level detection means. An autofocus mechanism, comprising: controlling the drive of a focus motor based on the output of the comparison means.