SU26094A1 - Colorimeter to measure the color of surfaces - Google Patents

Description

Patent No. 20361 describes a colorimeter in which a disc with three sector openings, covered with filters of three different colors chosen for the primary colors, is used as the color standard. The color of the screen, illuminated by additively mixed rays that have passed through these three light filters, is fitted to the color to be tested; this is achieved by closing more or less of each of the filters with non-transparent screens. The color measurement is made by counting the angles of the sector holes in the disk,

In the proposed modification of the described colorimeter, instead of a disk with sector openings and movable screens, a complex triple filter of three colors is used, which can be moved in front of the lens projecting the light beam onto the screen.

In FIG. 1 depicts the scheme of the proposed colorimeter; FIG. 2-tricolor filter.,

The colorimeter device is as follows. Inside the box (Fig. 1) a light source Z ,, for example, a 60 W milk glass lamp, is placed in front of which a non-transparent diaphragm DI with a round aperture is placed. Lens O gives an image of this hole to a white screen E, the bright spot produced here illuminates one field of the cube. A Hall meter, whose field border is viewed by the eye through the eyelet w. Another cube field. K is illuminated with a bright spot with the help of a prism P - the image of a hole in the diaphragm /) located also near the lamp L. This image gives a lens M on the test surface x of the sample. The ZJj diaphragm is located on the mid-lens O, with a square notch bounding the lens aperture O.

Near the diaphragm DZ there is a complex filter of PG consisting of transparent plates of three selected for primary colors (Fig. 2). Using appropriate devices, the F filter can move in two: mutually perpendicular directions, lying in the plane, perpendicular, to the optical axis of the lens O.

Using the filter F, the color of the spot on screen E can be adjusted to the color of the test surface x.

From the readings of the filter displacements (on the scales with the help of pointers), it is possible to determine the relative values of the pitch of the adeas, to occupy each of the three sections; -filter, and from here calculate the three-color coordinates of the color.

A voltmeter and an adjustable ground resistor are introduced into the lamp circuit L, not shown in the drawing.

The subject matter of the invention.

1. Modifying a colorimeter to measure the surface color and transparent spots according to claim 2 of patent No. 20361, characterized in that instead of a disk with three sector holes and three sector movable screens, a complex triple filter from three selected for primary colors was used near the lens O, arranged movable in two mutually perpendicular directions lying in a plane perpendicular to the optical axis of the lens O. 2. Use a colorimeter according to claim 1 to compare the color of the test surface X illuminated by L regular enrollment through the diaphragm M and a lens with a received image on the screen E in color from the same light source L through the tricolor filter F, P prism total internal reflection for directing rays at the cube Lummer AH.

/ Gl - Iv

(-jy - / v

X ...

 I

in; .. yr

J.