JPS59823B2 - Offset In-Saturation Height Camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate-making camera that has a film mounting plate that is on the same plane as the document mounting plate and is rotatable for use in both convex and offset printing.

Conventional plate-making cameras, which have the film mounting surface and original document mounting surface on the same plane, have optical axis direction conversion elements such as mirrors and prisms on both sides of the plate-making lens, so there are two reflective surfaces. It could only be used for offset printing.

The present invention has been developed for use in both convex and offset printing without sacrificing the excellent operability of this coplanar plate making camera.

The present invention will be explained in detail below based on illustrated embodiments.

The figure shows an embodiment of a coplanar plate making camera in which the original and film mounting surfaces are provided below the optical axis direction conversion element, and its configuration is as follows. A document placement plate 5 is installed horizontally on a machine stand 4, and an optical axis direction conversion element 6 such as a mirror or a prism is installed obliquely directly above the original placement plate 5. This optical axis direction conversion element 6 is also located at the main axis (horizontal) of the plate making lens 3. The film mounting plate 1 is rotatably installed so that it is approximately on the same plane (horizontal) as the document mounting plate 5 during offset photography, and on the main axis (horizontal) of the plate-making lens 3 during letterpress photography. In addition, the optical axis direction conversion element 2 such as a mirror or prism is a plate making lens 3.
and the film mounting plate 1 so as to be freely interposed (slidingly movable in the figure) on the optical axis. The film mounting plate 1 is constructed by attaching a glass plate or the same effect plate to a fixed frame and assembling it into the machine base 4, as in other plate-making cameras, and attaching a vacuum device (not shown) for tightly adhering the film. The plate-making lens 3, document placement plate 5, and optical axis direction conversion element 6 have a drive mechanism (not shown) in the main axis direction for pit adjustment.

The document placement plate 5 and the optical axis direction conversion element 6 move integrally while maintaining respective fixed positions. The operation of the film mounting plate in the above embodiment is as follows.

First, place the film placement plate 1 horizontally, and then
Set the film on the same plane as the

- When photographing for offset printing, the film mounting plate 1 is left as it is and the optical axis direction conversion element 2 is connected to the plate making lens 3.
be placed on the main axis of the When photographing for letterpress printing, the mounting plate 1 on which the film is set is rotated and set so that it is perpendicular to the main axis of the plate-making lens 3. At this time, the optical axis direction conversion element 2 is slid to be removed from the main axis of the plate making lens 3. Pit adjustment during photographing is performed by a drive mechanism including a plate-making lens 3, a document placement plate 5, and an optical axis direction conversion element 6. The present invention is constructed as described above and has the following excellent features.

Conventional vertical convex. When compared with an off-duty dual-use plate-making camera, the present invention can be used only by removing the optical axis direction conversion element 2 on the film mounting surface from the main axis of the plate-making lens 3, whereas the conventional vertical dual-use plate-making camera Although the camera can be used for both purposes due to the action of the reflecting mirror and the breaking prism, the present invention is superior in structure and operability.

Furthermore, compared to conventional offset-only cameras in which the document and film mounting surfaces are on the same plane, the present invention makes the film mounting plate rotatable and has a convex surface. Since it is used for both offset and offset purposes, the advantages of a coplanar plate making camera are maintained. That is, because the original plate 5 and the film plate 1 can be installed on substantially the same plane due to the action of the optical axis direction conversion element, the original and film can be attached and removed at the same place, which is different from the conventional floor type or It is no longer necessary to go back and forth between the original plate and the film plate as in a suspended type plate-making camera, and the amount of work is significantly reduced. In addition, since the shape is compact, there is no need for partition work and it can function as a completely dark room, so the area occupied during installation can be reduced, and manufacturing costs can be reduced. Further, when the plate-making lens 3 is installed above the document and film mounting plates 1 and 5 as shown in the figure, the height of the machine stand 4 can be freely designed, so that it can be set to the optimum height for the work. This invention has the above-mentioned advantages and is an extremely excellent invention.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of the embodiment. 1...Film mounting plate, 2...Optical axis direction conversion element, 3...Print making lens, 4...
・Machine stand, 5... Original mounting plate.

Claims (1)

[Claims] 1 In a plate-making camera in which the original and the film are placed on the same plane, a film mounting plate 1 is rotatably provided, and an optical axis direction conversion element 2 such as a mirror or prism is placed between the plate 1 and the plate-making lens 3. A device for both convex and offset printing, which is freely disposed on the optical axis, and the plate making lens 3 is movable in the optical axis direction, and the document placement plate 5 and the optical axis direction conversion element 6 are integrally movable in the main axis direction. Same plane plate making camera.