Photographic printing apparatus

Details Photographic printing apparatus Photographic printing apparatus

1995-04-21

1997-07-01

Grimley, Arthur T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

359698, 359821, G03B 2734

Patent

active

056443820

ABSTRACT:
A photographic printing apparatus includes a lens unit and a lens mount which are joined to each other in a separable manner. The lens mount includes therein a drive motor and a drive force transmitting mechanism to adjust the focal distance and aperture of the lens unit. A plurality of lens units having different focal distances are provided, from which a lens unit suitable for a printing magnification is automatically selected for printing. Each lens unit is provided with external connection members which are connected to an aperture adjusting mechanism and the focal distance adjusting mechanism of the lens unit. The lens mount to which the lens unit is attached is provided with members which are engaged with the external connection members of the lens unit to displace them. The displacement of these members is effected by motors provided on the lens mount. With this structure, the cost of lens units can be reduced, and the efficiency of the printing operation can be increased.

REFERENCES:
patent: 3996596 (1976-12-01), Kurtik
patent: 4172657 (1979-10-01), Watanabe et al.
patent: 5038168 (1991-08-01), Kurimoto et al.

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