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86. 发明专利

DE3275875D1 PROCESS AND APPARATUS FOR DETERMINATION OF THE EXPOSURE TIME 未知
公开(公告)号：DE3275875D1
公开(公告)日：1987-04-30
申请号：DE3275875
申请日：1982-12-07
申请人： DURST AG
发明人： REITERER WALTHER
IPC分类号： G03B27/73

88. 发明专利

DE2728547C2 未知
公开(公告)号：DE2728547C2
公开(公告)日：1986-10-16
申请号：DE2728547
申请日：1977-06-24
申请人： DURST AG, FABRIK FOTOTECHNISCHER APPARATE, BOZEN, IT
发明人： GANDINI, MARIO, BRIXEN, IT
IPC分类号： G03B27/54 , G03B21/20
摘要： A light mixing compartment for a projector, such as incorporated in a photographic copier or enlarger, has four convexly curved side panels disposed between the entrance and exit, which are covered by light diffusing plates. The cross sections of the compartment parallel to its diffusing plates are cylindrical or rectangular with the sides having different angles of inclination adjacent the entrance from those at the exit. The ultimate slope of the sides adjacent the exit preferably is a right angle, and the overall shape of the convexly curved sides is adjusted to control the marginal brightness of the light format emitted from the compartment. The four convexly curved sides are held together by appropriately shaped bands riveted to the sides for securing them together.

89. 发明专利

DE2601054C2 未知
公开(公告)号：DE2601054C2
公开(公告)日：1985-09-12
申请号：DE2601054
申请日：1976-01-13
申请人： DURST AG, FABRIK FOTOTECHNISCHER APPARATE, BOZEN, IT
发明人： GANDINI, MARIO, BRIXEN, IT
IPC分类号： G03B27/52 , G03B27/54
摘要： An illumating device for a photograph enlarging or copying apparatus has a pair of lighting compartments having different characteristics movably connected to each other and mounted to slide back and forth across the optical axis. The light compartment better adapted to the particular format to be copied is positioned in line with the optical axis. A diffusing lens is insertable in the light emergence side of the lighting compartment being utilized, and the diffusing lens may be movably mounted so as to position different areas in the path of light emerging from the compartment.

90. 发明专利

FR2363130B1 未知
公开(公告)号：FR2363130B1
公开(公告)日：1982-12-03
申请号：FR7725775
申请日：1977-08-24
申请人： DURST AG
IPC分类号： G03B27/54
摘要： A light mixing compartment for a projector, such as incorporated in a photographic copier or enlarger, has four convexly curved side panels disposed between the entrance and exit, which are covered by light diffusing plates. The cross sections of the compartment parallel to its diffusing plates are cylindrical or rectangular with the sides having different angles of inclination adjacent the entrance from those at the exit. The ultimate slope of the sides adjacent the exit preferably is a right angle, and the overall shape of the convexly curved sides is adjusted to control the marginal brightness of the light format emitted from the compartment. The four convexly curved sides are held together by appropriately shaped bands riveted to the sides for securing them together.

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