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US3672284A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic camera

Assignee: Individual
•
Filing: 1970-08-04
•
Granted: 1972-06-27
•
Expires: 1990-08-04
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Abstract

Abstract A photographic camera having a light sensitive element (e.g., a photoresistance of a photocell) for measuring the intensity of a particular beam of incoming light, such as the light coming through the photographic lens, when the construction is used with a single lens mirror reflex camera. The light sensitive element is not in the path of but is offset from the beam of light to be measured. Light from the beam to be measured is transmitted to the light sensitive element through a cable of optical fibers, the output end of the fibers being at the light sensitive element, and the input end thereof lying in the path of the beam of light to be measured, for example lying behind a partially reflecting and partially transmitting portion of the reflex mirror. When the mirror is in the viewing position, the input end of the cable or bundle of fibers receives light from the incoming beam and transmits such light to the light sensitive element. When the mirror is swung up to the picture taking position, the light transfer between the input end of the bundle of fibers and the light sensitive element is interrupted. The light sensitive element is in an electric circuit performing a metering or controlling function, and this circuit includes a switch closed to make the circuit operative when the mirror is in the viewing position, and opened to make the circuit inoperative when the mirror is swung up to the picture taking position.

Inventors

  • 👤 Gerhard Schwarz

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 23:14
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09972

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 159 words
A photographic camera comprising lens means for directing a beam of light along a path toward a photographic film to make an exposure thereon, a light responsive element for measuring the intensity of incident light, said element being located outside of said path, and light conducting optical fibers having light receiving input ends located within said path when a measurement of light intensity is to be made and having output ends located outside said path in the vicinity of said element and arranged to direct to said element the light received at said input ends and conducted along said fibers, characterized by the fact that said input ends of said fibers are so shaped and so placed as to accept and conduct only light from within a truncated cone whose larger base is the maximum aperture of the rear end of said lens means and whose smaller base is the area occupied by said input ends of said fibers.
Claim 2
Dependent Claim 159 words
A photographic camera comprising lens means for directing a beam of light along a path toward a photographic film to make an exposure thereon, a light responsive element for measuring the intensity of incident light, said element being located outside of said path, and light conducting optical fibers having light receiving input ends located within said path when a measurement of light intensity is to be made and having output ends located outside said path in the vicinity of said element and arranged to direct to said element the light received at said input ends and conducted along said fibers, characterized by the fact that said input ends of said fibers are so shaped and so placed as to accept and conduct only light from within a truncated cone whose larger base is the maximum aperture of the rear end of said lens means and whose smaller base is the area occupied by said input ends of said fibers.
Claim 3
Dependent Claim 56 words
A construction as defined in claim 1, in which said input portions of said fibers are located approximately in the center of said beam of light when a measurement of light intensity is to be made, and means for moving said fibers entirely out of said beam of light when an exposure is to be made.
Claim 4
Dependent Claim 67 words
A construction as defined in claim 1, in which said camera is a single lens mirror reflex camera having a mirror movable between a viewing position in said beam of light and an exposure position out of said beam of light, and in which said input ends of said optical fibers are connected to said mirror to move therewith into and out of said beam of light.
Claim 5
Dependent Claim 76 words
A construction as defined in claim 3, in which at least a portion of said mirror near the center of said beam of light when the mirror is in viewing position, is semitransparent so as to reflect part of the light falling thereon and to transmit another part of such light through said mirror, said input ends of said optical fibers being mounted on the rear of said mirror to receive light transmitted through the mirror.
Claim 6
Dependent Claim 102 words
A construction as defined in claim 1, in which said camera is a single lens mirror reflex camera having a reflex mirror swingable in an exposure chamber, said exposure chamber having a side wall, and in which said light responsive element is mounted on said side wall, and in which said light conducting optical fibers are in the form of a flexible rod of fibers, the input end of which rod is mounted on and movable with said mirror, and the output end of which rod is mounted on said side wall in position to deliver light to said light responsive element.

References Cited (Backward Citations)

US3114283A Cited
US3280714A Cited
US3540363A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-06-27 1975-12-27 1976-06-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-06-27 1979-12-27 1980-06-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-06-27 1983-12-27 1984-06-27 $7700.00 Window Closed / Lapsed

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