Apparatus for mixing light wherein the various color components are efficiently mixed to a uniform distribution. Light is introduced into one end of an optically clear rod-like member through a diffuser and is mixed therein through internal reflection.

Light mixing apparatus and photographic enlarger embodying same

An automatic exposure control circuit for a camera or the like includes a memory circuit comprising a series connection of a capacitor and an impedance element connected to an input of a high input impedance circuit to enable the measurement of the amount of mean light during photography under a fluorescent lamp.

Automatic exposure control circuit for a camera

A system for printing photographs form developed film includes a light receiving element for detecting an image condition, such as the image density or color balance, which is used to control a printing light source. The light from the printing light source projects the photographic image on photographic paper through the developed film. A code reader reads codes printed in the vicinity of the film frame through a line sensor. The codes includes data concerning the photographic mode selected, such as pseudo focal length or a normal photographic mode. The light receiving element detects the image condition only of the area to be printed in accordance with the selected photographic mode and which passes through the developed film and a printing zoom lens.

Photographic camera image reproduction system

A luminous source apparatus, an image projecting apparatus, and an image projection converting apparatus are provided, so as to prevent a projected image, or an electronic image obtained through electronization of the projected image from intensity variations. A photosensor detecting light-emission quantity from a light-emission lamp is set up, in order to regulate the current supplied with the light-emission lamp from a power according to a light-quantity detecting signal from the photosensor, so as to make the light-emission quantity from the light-emission lamp constant. Projected light-quantity onto a movie film is regulated and an image obtained from a shooting section becomes an image having a good quality with a little flicker.

Luminous source apparatus, image projecting apparatus and image projection converting apparatus

In recording original images such as manuscripts on microfilm, it is necessary to expose the images at an appropriate amount of light which well corresponds with the original density. According to the present invention, there is provided only one sensor for detecting the density of the original images, making it possible to quickly detect the overall density of the original image. The result of the above photometry permits exposure of a microfilm with an amount of light which makes the lightest portion of the microfilmed images constant in density, thereby to achieve high quality control of microfilming process.

Automatic exposure device in camera for microfilm

A first and second diaphragm blade respectively are coupled to a first and second solenoid. The solenoids are intercoupled by gearing in such a manner that the first solenoid rotates in a direction opposite to the second solenoid. One solenoid is activated for closing the diaphragm, one for opening the diaphragm. The signals activating each solenoid are derived from a differential amplifier which compares a signal furnished by a photosensitive element to a reference signal signifying the desired exposure.

Weinert

Papers

Photographic copying arrangement with automatic diaphragm control