|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||250/204 ; 354/25|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 9 인용 특허 : 6|
An improved automatic focus system wherein circuitry is provided to inhibit the focusing function when the scene being viewed provides too little contrast for satisfactory operation.
Apparatus for use in controlling the drive means of an auto focus system comprising: sensing means receiving radiation from the scene, comparing radiation intensities from two selected portions of the scene as an indication of contrast and producing an output signal when the contrast is below a predetermined value; and inhibit means connected to said sensing means to receive the output signal and upon receipt to prevent operation of the drive means.