公开(公告)号：US3614241A

公开(公告)日：1971-10-19

申请号：US3614241D

申请日：1970-06-19

Applicant: ITEK CORP

Inventor： SANFORD LLOYD CLIFFORD ,  O'BRIEN JOHN AUGUSTUS

IPC: G01J1/42 ,  G01N21/59 ,  G01J3/50 ,  G01N21/22

CPC classification number: G01N21/5911 ,  G01J1/42

Abstract: A densitometer which simultaneously determines and records the optical density of a strip of photographic film. The filmstrip is mounted on a first portion of a curved platen. A piece of graph paper is mounted on a second portion of the curved platen adjacent to the first portion. A unitary arm is mounted above the curved platen and moves in an arcuate path parallel to the surface of the support platen. The moving unitary arm scans the density of the film and simultaneously records the density on the graph paper. The second portion of the curved platen, on which the graph paper is mounted, has a larger radius of curvature than the first portion of the curved platen on which the film is mounted. The mechanical advantage of the larger radius enables the density to be recorded on a graph having a longer abscissa than the length of the filmstrip. The densitometer has the capability of measuring both reflection and transmission density. For transmission density a light source is located in the unitary scanning arm and directs light through the filmstrip to a photomultiplier tube located below the filmstrip. The output of the photomultiplier tube is utilized to drive a recorder which plots the density on the graph paper. For reflection density a light source is located beneath the filmstrip and directs light against the lower surface of the filmstrip. The reflected light is then directed to the same photomultiplier tube used for transmission density. The densitometer, while measuring either reflection or transmission density, has the capability of measuring the density of red, green, or blue colors in the filmstrip. This capability is added by having a cylindrical filter located around the photomultiplier tube. The cylindrical filter has green, red, and blue filter portions. The density of a particular color is measured by interposing that filter in the light path, thereby allowing only the light of that color to pass to the photomultiplier tube.

公开(公告)号：US3677150A

公开(公告)日：1972-07-18

申请号：US3677150D

申请日：1970-10-02

Applicant: ITEK CORP

Inventor： SANFORD LLOYD CLIFFORD

IPC: F21K5/12 ,  G01J1/42 ,  G01J1/52

CPC classification number: F21K5/023 ,  G01J1/42

Abstract: An exposure source unit for a sensitometer. The exposure source unit provides in a single structure the combination of a flash lamp, a photographic density wedge, and a plurality of radiation paths from the flash lamp to an exposure plane in which the photographic density wedge is located. The exposure source unit is constructed to provide substantially uniform radiation over the entire area of the exposure plane. In first and second embodiments, a flash lamp is located adjacent to one end of the exposure source unit, and the exposure source unit presents a plurality of folded optical paths to the exposure plane. The folded optical paths prevent radiation from directly striking the exposure plane. The cross sectional area of the exposure source unit increases as the distance from the flash lamp increases. The internal walls of the unit are formed of highly reflective, light scattering surfaces so that light is thoroughly scattered before reaching the exposure plane. In a third embodiment, the exposure source unit is constructed of clear plastic and is shaped so radiation from the lamp is selectively internally reflected within the unit and selectively transmitted from the unit to provide substantially uniform radiation over the entire area of the exposure plane.

Abstract translation: 感光度计的曝光源单元。 曝光源单元以单一结构提供闪光灯，照相密度楔以及从闪光灯到照相密度楔所在的曝光平面的多条辐射路径的组合。 曝光源单元构造成在曝光平面的整个区域上提供基本均匀的辐射。 在第一和第二实施例中，闪光灯位于曝光源单元的一端附近，曝光源单元呈现多个折叠的光路到曝光平面。 折叠的光路防止辐射直接撞击曝光平面。 曝光源单元的横截面积随着与闪光灯的距离的增加而增加。 单元的内壁由高反射性，光散射表面形成，使得光在到达曝光平面之前被彻底散射。 在第三实施例中，曝光源单元由透明塑料构成，并且其形状使得来自灯的辐射在单元内选择性地被内部反射并从该单元选择性地传输，以在曝光平面的整个区域上提供基本上均匀的辐射。

公开(公告)号：US3518013A

公开(公告)日：1970-06-30

申请号：US3518013D

申请日：1966-09-26

Applicant: ITEK CORP

Inventor： SANFORD LLOYD CLIFFORD ,  O'BRIEN JOHN A

IPC: G01J1/42 ,  G01N21/59 ,  G01N21/02 ,  G01N21/22

CPC classification number: G01N21/5911 ,  G01J1/42