| 摘要 |
1281011 Photographic exposure control EASTMAN KODAK CO 10 July 1969 [22 July 1968] 34727/69 Heading G2A A camera comprises feelers 60, 85 which detect tactile codings on a film cartridge indicating spectral sensitivity and film speed and adjust a filter 81 for an objective 10 and filters 61, 71 for a photo-cell 11 of an automatic exposure control system; the arrangement being such that, when the coding indicates the maximum film speed for which the control system is designed, both filters 61, 71 are moved out of the light path of the photo-cell 11. The control system varies either shutter speed or aperture size. When film designed for daylight exposure is used, sensor 85 is rotated to remove filter 81, and sensor 60 enters a notch in the cartridge whose depth indicates film speed to adjust filter 61 accordingly. If maximum speed film is used filter 61 is moved right out of the photo-cell light path and in so moving, also removes filter 71 by means of a cam surface 60b. When film designed for artificial light exposure is used, sensor 85 enters a notch to leave filter 81 in the light path, and filter 61 is again adjusted according to film speed. This sets the artificial light film for daylight exposure. If artificial light exposure is required a key 35 is inserted and contacts a lug 76 to remove lens filter 81 and to remove filter 71 to compensate for this. If key 35 is inserted when daylight film is present it has no effect, since rotation of sensor 85 has shifted a lever 70 a distance sufficient to prevent key 35 engaging lug 76. Fig. 1 (not shown) depicts a similar situation but no means is provided for rendering key 35 ineffective when daylight film is used. |
