Photographic film blackening area measuring device

Details Photographic film blackening area measuring device Photographic film blackening area measuring device

1980-05-19

1981-10-06

Corbin, John K.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

250227, G01N 2159, G02B 514

Patent

active

042932262

ABSTRACT:
A photographic film blackened area measuring device, having two rod shaped light conducting members, each of which is formed as an elongated piece of transparent material with part of its surface, parallel to its axis, being roughened so as to diffuse light, while light is totally internally reflected along the length of the rod shaped member from the remainder of its smooth surface. These rod shaped light conducting members are arranged one on each side of a piece of developed photographic film in a automatic film developing machine, and the film passes between them. A light emitting device is provided at one end of one of the rod shaped light conducting members, and a photo sensitive device is provided at the end of the other rod shaped light conducting member which is remote from the light emitting device. Thereby, as the photographic film moves between the rods, fluctuations of the output of the light sensitive device are produced, depending on the total area of blackening of the photographic film, but substantially independent of the positioning and arrangement of said blackened area with respect to the edges of the film.

REFERENCES:
patent: 3317738 (1967-05-01), Piepenbrink et al.
patent: 3617132 (1971-11-01), Bell

Affiliated with

Also associated with

Rating

Photographic film blackening area measuring device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic film blackening area measuring device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic film blackening area measuring device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1203996