GB2435525A - A viewfinder unit for a camera - Google Patents

A viewfinder unit for a camera Download PDF

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Publication number
GB2435525A
GB2435525A GB0603808A GB0603808A GB2435525A GB 2435525 A GB2435525 A GB 2435525A GB 0603808 A GB0603808 A GB 0603808A GB 0603808 A GB0603808 A GB 0603808A GB 2435525 A GB2435525 A GB 2435525A
Authority
GB
United Kingdom
Prior art keywords
lt
gt
camera
viewfinder unit
unit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0603808A
Other versions
GB0603808D0 (en
Inventor
Jonathan Bradley
Original Assignee
Jonathan Bradley
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jonathan Bradley filed Critical Jonathan Bradley
Priority to GB0603808A priority Critical patent/GB2435525A/en
Publication of GB0603808D0 publication Critical patent/GB0603808D0/en
Publication of GB2435525A publication Critical patent/GB2435525A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00Details of cameras or camera bodies; Accessories therefor
    • G03B17/02Bodies
    • G03B17/06Bodies with exposure meters or other indicators built into body but not connected to other camera members
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/02Viewfinders

Abstract

A viewfinder unit comprising a light source utilises the existing mirror and lens of a camera to project a frame onto the object to be photographed. The viewfinder unit may comprise the following: an image focussing cue unit (e.g. an infra-red dispersal system), a holographic (e.g. laser) raster scan system, light exposure reading equipment. The unit may be self powered. The unit may be shut off by an internal mechanism.

Description

<p>Light Projective viewfinder system.</p>

<p>This invention relates to a projective viewfinder system for non-rangefinder photographic cameras, either Single or Twin Lens Reflex.</p>

<p>In classic portrait photography, the aim of the photographer demands that he or she be constantly aware of the scene the camera will expose. This is usually done by means of sight through a viewfinder system (either directly onto a screen, creating a reversed image, or through a prism, creating an orientated image). Through this, the photographer assesses several key quantities, chiefly focus.</p>

<p>Research has shown that this may not always benefit subject andlor photographer insofar as acquiring desirable results. It has been found that if the photographer maintains a more positive eye contact with his or her subject -be it still life or portrait in nature, greater control over the framed shot can be achieved.</p>

<p>This invention describes a concept which projects a frame through the camera lens and consequently gives a visual cue to the photographer as to what picture will be taken at a specific given point in time.</p>

<p>The diagram shows a cross-section of a typical camera. For the purposes of explanation only, the diagram represents a typical 6cm medium-format camera system though can be applied to a variety of camera designs.</p>

<p>The example described herein is a multifunction unit. Straddling atop the camera (shown as the internal camera, body and mirror array (ICBMA)) is the projector unit itself. A light source (LS) projects light onto a fixed mirror (FM) through a collimator and focussing unit (CFU) optimised for equal length of light travel from lens to mirrors as from lens to exposure media, which as described, can be optionally tripartisised for integration of other components. The mirror is held in place with pre-positioned guides, the upper part of which is housed in the upper mirror house (UMH).</p>

<p>Light from the fixed mirror travels down and is reflected through the primary camera lens (PCL) by means of the camera's primary mirror (PM). It is then projected forward to the photographed target (PT).</p>

<p>When in use, the light travels through a focus screen (FS) which can overlay a projeetive visual aid to assist the photographer in focussing the camera, example a split-prism screen. The camera is adjusted within the boundaries of the frame so projected and the shutter release is fired when the desired photograph is achieved.</p>

<p>With this concept, the primary mirror will travel upward. In this concept, this motion activates a electrical shut off micro switch (ESOMS) that serves to switch the projection unit off while the film back device (FBD) or sensor is being exposed to the light reflected off the subject so as to eliminate any risk of the projection light itself interfering or fogging the camera's proper operation. Returning the primary mirror to its original state resets the projector.</p>

<p>This concept also includes additions to the projector unit which are included in the inventory claims. The projector unit also houses exposure computation cells (ECEquip) at strategic points that feed to the projector central microprocessor unit (PCMPU). Compensated for the inherent light generated by the projector itself, the unit is enabled to take exposure readings of the subject. An incident light cell (ILC) can also be used to take similar readings and is interfaced similarly. An optical infrared focussing array (OIRFA) enables the projection of invisible infrared radiation through the system and is optically calibrated, by means of an internal lens set and the collimator to give annunciation when infrared return is at minimal dispersion i.e. at prime focus. The PCMPU can also control the projection of the concept's chief design advancement from a simple light is a multi raster scan laser array (RSLA). The RSLA is a high-speed, micro laser (or equivalent) array which serves to project a near holographic visual aid on the subject examples being crosshairs, exposure reading, framing and focussing aids. This system is powered by a powercell which can be designed to be removable and rechargeable and is embedded within the UMH.</p>

Claims (3)

  1. <p>Claims 1. A viewfinder unit which can be attached to a camera which
    projects a view identical to the taking view of the relative image frame of the camera by utilising the existing minor and lens units of the existing camera, relying on no other projective ability (in comparison to patent US674 1809)
  2. 2. A viewfinder unit according to claim I which can integrate an image focusing cue unit by means of an infra-red dispersal system.</p>
    <p>3. A viewfinder unit according to claim 1 which can integrate a holographic (laser or otherwise) raster scan system to provide a high-resolution targeting cue so as to aid the nature of projection as described in claim 1.</p>
    <p>4. A viewfinder unit according to claim I which can integrate direct and indirect light exposure reading equipment, the output of which can be displayed by equipment according to claim
  3. 3.</p>
    <p>5. A viewfinder unit according to claim 1 that has the ability to be self-powered.</p>
    <p>6. A viewfinder according to claims 1, 2, 3, 4 and 5 which is fully integrated.</p>
    <p>7, A viewfinder unit according to claim 1 which has the ability to be shut off by an internal mechanism.</p>
    <p>8. A viewfinder unit according to claim 1, 2, 3, 4, 5, 6, 7 and 8 which can be subsequently utilised in any potential design of single-lens reflex camera (in comparison to patent EP1022608)</p>
GB0603808A 2006-02-24 2006-02-24 A viewfinder unit for a camera Withdrawn GB2435525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0603808A GB2435525A (en) 2006-02-24 2006-02-24 A viewfinder unit for a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0603808A GB2435525A (en) 2006-02-24 2006-02-24 A viewfinder unit for a camera

Publications (2)

Publication Number Publication Date
GB0603808D0 GB0603808D0 (en) 2006-04-05
GB2435525A true GB2435525A (en) 2007-08-29

Family

ID=36178767

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0603808A Withdrawn GB2435525A (en) 2006-02-24 2006-02-24 A viewfinder unit for a camera

Country Status (1)

Country Link
GB (1) GB2435525A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5059019A (en) * 1990-05-21 1991-10-22 Mccullough Greg R Laser framefinder
US5694632A (en) * 1991-12-23 1997-12-02 Capper Technologies, Inc. Camera with autofocus and aiming mechanism and method
EP1022608A1 (en) * 1999-01-21 2000-07-26 Hewlett-Packard Company Camera with projection viewfinder
GB2359895A (en) * 2000-03-03 2001-09-05 Hewlett Packard Co Indicating area of view of a camera using projected light
US6741809B1 (en) * 2003-07-14 2004-05-25 Primax Electronics Ltd. Image capturing apparatus with laser-framing viewfinder and laser pointer functions
EP1453297A1 (en) * 2000-11-08 2004-09-01 Xerox Corporation Method and apparatus for indicating a field of view for a document camera

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5059019A (en) * 1990-05-21 1991-10-22 Mccullough Greg R Laser framefinder
US5694632A (en) * 1991-12-23 1997-12-02 Capper Technologies, Inc. Camera with autofocus and aiming mechanism and method
EP1022608A1 (en) * 1999-01-21 2000-07-26 Hewlett-Packard Company Camera with projection viewfinder
GB2359895A (en) * 2000-03-03 2001-09-05 Hewlett Packard Co Indicating area of view of a camera using projected light
EP1453297A1 (en) * 2000-11-08 2004-09-01 Xerox Corporation Method and apparatus for indicating a field of view for a document camera
US6741809B1 (en) * 2003-07-14 2004-05-25 Primax Electronics Ltd. Image capturing apparatus with laser-framing viewfinder and laser pointer functions

Also Published As

Publication number Publication date
GB0603808D0 (en) 2006-04-05

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)