Television – Camera – system and detail – With electronic viewfinder or display monitor
Reexamination Certificate
1998-08-14
2001-02-20
Ho, Tuan (Department: 2712)
Television
Camera, system and detail
With electronic viewfinder or display monitor
C348S207110, C348S296000
Reexamination Certificate
active
06191818
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to video cameras. More specifically, the present invention relates to viewfinders that are used by video camera operators to determine the field of view of a video camera.
BACKGROUND OF THE INVENTION
Viewfinders are optical or electronic devices that may be joined to a video camera to allow an operator of the video camera to perceive the scene filmed. Optical viewfinders typically include a framing lens and mask coordinated with the actual video camera lens. By looking through an eye piece, the operator can see a frame provided by the mask that indicates the field of view of the video camera. The more common electronic viewfinders typically include a small image video monitor that includes a mini-black and white or color tube/liquid crystal display (LCD) screen. The electronic viewfinders displays the actual scene filmed by the video camera. The electronic viewfinders may be built into the video camera and thus viewed through an eye piece or mounted externally to allow easier viewing.
The conventional video camera viewfinder has several drawbacks. Because the conventional viewfinder includes a lens or monitor that is attached to the camera, the operator is required to direct attention away from the actual subject when filming a subject that moves in order to insure that the subject is within the camera's field of view. This may be inconvenient in situations where the operator is filming an interview or meeting in which the operator is also a participant. When using a conventional viewfinder that is attached to the camera, the operator's face may also be partially obstructed from the filmed subject. This may be problematic when continuous, direct eye contact with the subject is desirable such as when the operator is filming a child or an animal.
SUMMARY
A subject viewfinder is disclosed. The subject viewfinder includes a viewfinding unit that projects a frame target upon receiving a projection signal. A timing unit is coupled to the viewfinding unit. The timing unit generates the projection signal in response to information regarding a timing of when an image sensor of a camera is accumulating charge to form video fields.
REFERENCES:
patent: 2816475 (1957-12-01), Waller et al.
patent: 5161025 (1992-11-01), Nakao
patent: 5512950 (1996-04-01), Watanabe et al.
patent: 5557328 (1996-09-01), Ishihama et al.
patent: 5625411 (1997-04-01), Inuiya et al.
patent: 5712684 (1998-01-01), Inoue et al.
patent: 5745161 (1998-04-01), Ito
Blakely , Sokoloff, Taylor & Zafman LLP
Ho Tuan
Intel Corporation
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