News Column

Researchers Submit Patent Application, "Camera Viewfinder Comprising a Projector", for Approval

July 3, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor VAN DEN HERIK, Ben (Oosterhout, NL), filed on July 24, 2013, was made available online on June 19, 2014.

The patent's assignee is GVBB Holdings, S.A.R.L.

News editors obtained the following quote from the background information supplied by the inventors: "The present disclosure relates generally to video camera systems, and more particularly, to viewfinders used in camera systems.

"Camera viewfinders enable a camera operator to control certain aspects of images captured by cameras including, for example, image content, focus, etc. In video cameras, the viewfinder displays video captured by the camera in a small display screen that may have a diagonal measurement of between 2 inches and 9 inches. Cathode ray tube (CRT) technology has been long used for viewfinders in studio-quality camera systems but CRT systems may not be readily adaptable to high definition applications. These conventional systems often employ monochrome CRT displays for use in viewfinders.

"Most conventional broadcast cameras do not have an auto focus system and an operator must use a viewfinder with sufficient resolution to be able to manually focus a picture captured by the camera. High resolution cameras typically use a viewfinder that has a high resolution monochrome CRT display with a dimension of about 2 inches. However, availability of such CRT displays is limited and many replacement display technologies suffer from lower resolution and/or poor dynamic response."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "In an aspect of the disclosure, a viewfinder may be constructed using a projection system contained within the viewfinder housing. The projection system enables the viewfinder to offer a selectable display resolution and configurable aspect ratio.

"In an aspect of the disclosure, a viewfinder comprises a light source, one or more imaging panels that produce an optical output representative of an image using light received from the light source, a screen that displays the image. A housing encloses the light source, the one or more imaging panels and the screen. The housing may be adapted to receive an eyepiece used to view the image displayed on the screen. The eyepiece may be used to magnify the image.

"In an aspect of the invention, the optical output of the imaging panels may be produced from a video signal provided by the camera. The screen may be rectangular and typically has a diagonal dimension that is nine inches or less. In some embodiments, the screen has a diagonal dimension of two inches or less.

"In an aspect of the disclosure, the screen has a resolution sufficient to display standard definition images and/or high definition images. In one example, the screen has a resolution that is selectable between 800.times.480 pixels and 1280.times.800 pixels. Images may have various resolutions and be in various formats. An example format is Wide Extended Graphics Array (WXGA). An example resolution is 1280.times.800 pixels. However, one of ordinary skill in the art will appreciate that different resolutions and/or different formats may be implemented without deviating from the scope of the claims.

"In an aspect of the disclosure, the screen has a front side and a rear side, and the screen receives the optical output on the rear side of the screen, while the image is viewable on the front side of the screen through the eyepiece. The screen may be constructed from a particulate material such that the screen is characterized by a granularity at its surface and/or within its interior. The resolution of the screen may be determined by the granularity. The screen may be constructed from a fibrous material, and the resolution of the screen is determined by fiber width. The screen may comprise a polytetrafluoroethylene (PTFE) foil.

"In an aspect of the disclosure, the image is viewable as a reflection from the screen and the resolution of the screen is determined by a texture of a surface of the screen. The texture of the surface of the screen may be derived from one or more of a chemical treatment of the surface, an embossing of the surface, and an etching of the surface.

"In an aspect of the disclosure, the light source produces white light, and a plurality of color filters provides a different colored light to each of the one or more imaging panels. In some embodiments, the light source sequentially produces light having different wavelengths, and the one or more imaging panels comprises a single panel that is sequentially illuminated with the different light.

"In an aspect of the disclosure, the one or more imaging panels comprise a digital micromirror device (DMD). In an aspect of the disclosure, the one or more imaging panels comprise a liquid crystal display panel.

"In an aspect of the disclosure, one or more optical elements are configured to provide a desired optical path length between the imaging panel and the screen. The optical elements may include reflective and/or refractive elements.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a block diagram illustrating an example of a camera equipped with a viewfinder according to certain aspects of the invention.

"FIG. 2 is a block diagram illustrating front and rear projection viewfinders.

"FIG. 3 is a diagram illustrating certain aspects of screen materials.

"FIG. 4 depicts certain configurations of certain aspects of the invention.

"FIG. 5 is a conceptual block diagram illustrating the operation of imaging devices.

"FIG. 6 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system."

For additional information on this patent application, see: VAN DEN HERIK, Ben. Camera Viewfinder Comprising a Projector. Filed July 24, 2013 and posted June 19, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4913&p=99&f=G&l=50&d=PG01&S1=20140612.PD.&OS=PD/20140612&RS=PD/20140612

Keywords for this news article include: GVBB Holdings S.A.R.L.

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Source: Politics & Government Week


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