DE1780036U - PHOTOELECTRIC EXPOSURE METER. - Google Patents

Description

K odak joint stock company S tuttgar t. Stuttgart. Act. Draw. K 25 8A2h Gm. Utility model registration "Photoelectric light meter" ---------------------------------------- The innovation relates to a photoelectric light meter, in which the extension or. Reduction factors, such as filter factors, film sensitivity, camera excerpt, are taken into account when determining the measured value.

Arrangements of this type have become known in numerous embodiments. In some of the devices takes place the correction on adjustable scale carriers of the computing device tion and by mutual shifting to one another. With others ! Devices are used for the factor values in the immediate vicinity Shank of the fixed mark fixed to the housing, with the setting the adjustable links if necessary instead of the fixed mark on the corresponding factor value. Another device has a light value scale in the area of the instrument pointer, which corresponds to a certain film sensitivity. In addition, there is a correction scale which allows reading of additional factors for other film speed values. In summary, it can be stated that the first-mentioned devices make an additional shifting of setting members necessary when taking into account any factors, while with the last-mentioned device a conversion is necessary in the case of a different film speed, which easily gives rise to sources of error.

In photoelectric light meters for photographic and cinematographic cameras in which the measured values are determined by setting a tracking pointer determined on the pointer of the measuring instrument and direct reading on an index mark are, these disadvantages are avoided according to the innovation that in addition to Index mark further marks for direct reading of the light value to be set taking into account extension or Reduction factors, e.g. B. filter factors, Film sensitivity, camera extension or the like. Are arranged. This is at the same time with the adjustment of the tracking pointer the immediate reading of the correct light value possible.

Further details of the innovation are the protection claims as well the description of the illustrated embodiments can be found without changing but to be limited to the same.

Three exemplary embodiments are shown in the drawing. It shows : Fig. 1 an electric light meter with reading marks built into a camera a clip-on exposure meter to take into account film speed and filter factors, Fig. 2 with reading marks for different film speeds, Fig. 3 an exposure meter as in Fig. 2, but with several pointers when using / different types Footage.

On the upper narrow side of the camera housing 1 is hidden from the camera cover 2 the photoelectric measuring instrument. Above the fixed film speed disk 3, the adjusting washer 5 is rotatably arranged around the bearing screw 4. Around in turn, the rotating ring 6 is mounted in a known manner via an adjusting mechanism is coupled to the tracking pointer 7. The tracking pointer 7 and the measuring instrument pointer 8 are visible in the section 2a of the camera cover 2. The film speed disk 3 bears the numerical values for the film speeds in DIN ° 9 and ASA 10. Segmental Cutouts 5a and 5b in the setting disk 5 leave the film value dials 9 and 10 recognize.

On the dial 5 are the setting marks 11 and 12 for the respective film speed in DIN ° or ASA as well as the index mark 13 with the side Factor scales 14, 15 for the light value scale 16 located on the rotating ring 6.

The rotating ring 6 is provided with a knurl 6a for easy adjustment.

The device shown in Fig. 1 is handled as follows : The light sensitivity of the film material with which the camera is loaded, is set by setting markers 11 or 12 to the appropriate film speed dial value set to 9 or 10 in DINO or ASA. In the exemplary embodiment, the mark shows 11 to 15710 ° DIN. This is done by turning the disc 5 with the help of the button 5c. During the measuring process, the tracking pointer 7 is also activated by turning the rotary ring 6 the instrument pointer 8 brought into agreement, being the light value scale 16 rotated to the index mark 13 and to the factor scales 14 and 15. If the pointers 7 and 8 match, the index mark 13 is directly on the The light value to be set by the camera can be read. When using interchangeable lenses, Lens attachments, such as filters or the like, is the enlarged or reduced light value can be read directly from the corresponding number of factors on the 14 or 15 scale.

In the case of the clip-on exposure meter shown in Fig. 2, the measuring instrument surrounded by the housing 20. The instrument master 21 and the Tracking pointer 22 visible. The film sensitivity disk 23 has a screw 24 attached to the housing 20. The light value scale can be rotated around the latter 25 bearing rotating ring 26, which is connected to the tracking pointer 22 stands.

The scale arrangement of the exposure meter represents a simplification compared to the device described in Fig. 1. Instead of an index mark numerical values 27 for the film speed values are arranged in DINO, so that if the tracking pointer 22 coincides with the instrument pointer 21, the one to be set Light value can be read directly against any film speed value can. This is particularly important when using different light-sensitive devices at the same time Material in one or more cameras is an advantage.

In the further embodiment according to Fig. 3 are additionally To the arrangement shown in Fig. 2 adjustable pointers 28 and 29 are arranged. The same are around screw 24 stored and step with their expediently different colored pointer tips from the cutout 23a of the film sensitivity disk 23 out.

The innovation allows any combination of the described Embodiments and is applicable to any type of light meter.

Claims (3)

Protection claims 1.) Photoelectric light meter for photographic and cinematographic cameras in which, by coinciding with a tracking pointer With the pointer of the measuring instrument, the measured values can be read directly from an index mark are characterized in that, in addition to the index mark, there are other marks for direct Reading of the light value to be set, taking into account the extension or Reduction factors, e.g. B. filter factors, film sensitivity, camera excerpt, etc. Like., Are arranged. 2.) Device according to claim 1, characterized in that a or several pointers (28, 29) are arranged so as to be adjustable in relation to the reading marks (27). 3.) Device according to claim 2, characterized in that the Pointers (28, 29) are designed in different colors.