JP2681903B2 - Plate making camera device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plate-making camera device for photographing a line-making negative or a line-image positive for plate-making by photographing an original for photo-plate making called a master block. It is a thing.

[Conventional technology and its problems]

Process camera apparatus is to replicate the photolithography for the document is a planar image to original size or scaled, must be able to those of the original and large with the captured image for example A ₃ size as the object. Therefore, in the conventional plate-making camera device, the document surface, lens system,
The focal planes on which the photosensitive material is arranged are parallel to each other and are perpendicular to the lens optical axis, and a reduction / enlargement function is added to this. The lens is large and heavy, and a device for moving the lens up and down or left and right is also necessary to reduce and enlarge the lens. Therefore, the entire apparatus becomes very large and heavy. For this reason, a floor type or a suspension type has been put into practical use, but in any case, there is a problem that a large floor area is required and the handling is very complicated.

Furthermore, depending on the application, so-called vertical and horizontal reproductions (for example, the vertical direction of a document is equal to the original size are not necessary) without necessarily enlarging / reducing the document in the vertical direction and the horizontal direction (scanning direction, direction perpendicular to the scanning) at the same magnification. However, it is impossible for the conventional floor-mounted or suspended plate-making camera device to meet such demands.

[Object of the invention]

Therefore, the present invention is small and lightweight and easy to handle,
It is an object of the present invention to provide a plate-making camera device capable of duplicating enlargement / reduction in which the longitudinal and lateral directions of a document are not necessarily the same.

[Configuration of the invention and its operation]

The plate-making camera device of the present invention comprises a transparent glass platen placed on the upper surface of a casing, an exposure unit that exposes a plate for photolithography placed on the platen in a slit shape, and an exposure unit that forms a slit. A first drive mechanism for traveling in a direction perpendicular to the longitudinal direction, a first mirror unit for guiding the reflected light from the document to a lens system, and a second drive mechanism for traveling the first mirror unit in parallel with the exposure unit, A first initial positioning mechanism for the first mirror unit, a second mirror unit for guiding the reflected light that has passed through the lens system to the photosensitive material, a second initial positioning mechanism for the second mirror unit, and a photosensitive material for the exposure unit. In a plate making camera device comprising a conveyor system that travels in parallel with the first mirror by a first initial positioning mechanism and a second initial positioning mechanism. The initial positioning of the knit and the second mirror unit, the traveling speeds of the exposure unit and the first mirror unit are adjusted, and the traveling speed of the photosensitive material is freely set with respect to the exposure unit. A plate-making camera device characterized in that the scanning direction and the reduction / enlargement ratio in the direction perpendicular to the scanning can be freely set.

That is, the optical axis of the lens system is horizontal, the optical path is detoured by the first mirror unit and the second mirror unit without being orthogonal to the horizontal document and the photosensitive material, and the document is exposed by scanning the exposure unit. Since this is done, the casing can be made smaller and a very compact structure can be achieved. Therefore, the entire device is lightweight and does not require a large floor area. Then, the enlargement / reduction scanning is performed by the first drive mechanism and the second drive mechanism at the initial position of the first mirror unit and the initial position of the second mirror unit, respectively, and the optical path length from the document to the lens system and from the lens system to the photosensitive material. Set the ratio of to a value that matches the scaling ratio you want to duplicate.
Then, in order to reduce or enlarge or equalize the scanning direction and the direction perpendicular to the scanning (vertical direction and horizontal direction of the document) with the same magnification, the ratio of the traveling speed of the exposure unit to the moving speed of the photosensitive material is set. There is a secret that is decided in conjunction with it.

Further, when it is desired to reduce or enlarge the magnification in the scanning direction of the document and the direction perpendicular to the scanning (vertical direction and horizontal direction of the document) (when performing portrait or landscape reproduction), the traveling speed of the exposure unit and the photosensitive material are used. It is possible to reproduce by setting the ratio of the moving speeds of the document irrespective of the ratio of the optical path length from the document to the lens system and from the lens system to the photosensitive material. Therefore,
Various scaling functions can be easily incorporated into a small casing. Further, since the transparent glass platen is a table top type arranged on the upper surface of the casing, it can be duplicated in a so-called copy sense and is very easy to handle.

〔Example〕

Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings.

FIG. 1 conceptually shows an embodiment of the present invention. In FIG. 1, on a top surface of a casing 1, a document table 2 made of transparent glass, on which a document 3 having a maximum A ₃ size can be placed, is arranged, which is a table top type. An exposure unit 4 is arranged just below the document table 2 so as to be horizontally movable at a variable speed V. The exposure unit 4 is a two-lamp type in which two tube-shaped light source lamps 41 each surrounded by a gutter-shaped mirror 42 are attached, and the original 3 is exposed in a slit shape, but a flat mirror is provided below. M ₁ is located. Therefore, when the exposure unit 4 moves, the entire surface of the original 3 is scanned and exposed, and the reflected light of the original 3 is emitted in the horizontal direction by the mirror M ₁ .

First mirror unit 5 and second mirror unit 7
Is a pair of plane mirrors M ₂ , M ₃ and a pair of plane mirrors.
M ₄ and M ₅ are mounted in a roof shape at an angle of 45 degrees, and the optical axes are arranged on both sides of the lens system 6 in the horizontal direction. Therefore, the reflected light of the original 3 reflected by the mirror M ₁ is reflected by the mirrors M ₂ , M ₃ and enters the lens system 6,
The light emitted from is reflected by the mirrors M ₄ and M ₅ , and then the plane mirror
The light is reflected by M _{6 so} that the lower surface of the casing 1 is irradiated through the opening 11. Immediately below the casing 1, the traveling speed V ₀
, A conveyor system 8 that moves in the horizontal direction is arranged, and the light reflected in the vertical direction by the mirror M ₆ is placed on the conveyor system 8 and forms an image on the moving photosensitive material 9. The exposure unit 4 and the first mirror unit 5 are horizontally moved by a first drive mechanism 20 and a second drive mechanism 21, respectively. Although not shown, the first drive mechanism 20 and the second drive mechanism 21 are composed of a motor, a pulley and the like.

Here, the first mirror unit 5 moves in parallel in the same direction as the exposure unit 4 at a speed of 1/2 V, that is, half the speed of the exposure unit 4, and the original 3 is moved as the exposure unit 4 moves.
The optical path length from to the lens system 6 does not change. Then, the initial position of the first mirror unit 5 (position at which movement starts) and the initial position of the second mirror unit 7 can be changed by the first initial positioning mechanism 30 and the second initial positioning mechanism 31, respectively. As a result, the optical path length from the original 3 to the lens system 6 and from the lens system 6 to the photosensitive material 9 can be changed to set the reduction / enlargement magnification. When the original scanning direction and the direction perpendicular to the scanning (vertical and horizontal directions of the original) are reduced and enlarged at the same magnification, the optical path lengths from the original 3 to the lens system 6 and from the lens system 6 to the photosensitive material 9 are changed. In addition, the traveling speed V of the exposure unit 4 and the moving speed V ₀ of the photosensitive material 9 need to be adjusted in association with the ratio of the optical path length. Therefore, the scanning speed V is changed in association with the reduction / enlargement ratio.

Furthermore, in the case where so-called portrait and landscape reproductions are performed by setting the reduction / enlargement ratio in the scanning direction of the document and the direction perpendicular to the scanning, respectively, in the case of so-called portrait and landscape reproduction, the reduction / enlargement ratio of the photosensitive material is linked to the setting of the photosensitive material. Copying can be performed by separately specifying the traveling speed V of the photosensitive material without changing the moving speed.

Thus, the original 3 and the photosensitive material 9 are in the horizontal direction, the optical axis of the lens system 6 is also horizontal, and the lens system 6 is not parallel to the original 3 and the photosensitive material 9. Then, the original 3 is exposed by the scanning of the exposure unit 4, and the optical path from the original 3 to the photosensitive material 9 is detoured by the plane mirrors M _{1 to} M ₆ . Further, in the enlargement / reduction enlargement operation, the initial position of the first mirror unit 5 and the set position of the second mirror unit 7 are appropriately changed, and the ratio between the traveling speed V of the exposure unit 4 and the moving speed V ₀ of the photosensitive material 9 is changed. Set according to the intended use. Therefore, the casing 1 can be made compact and can have a very compact structure. Since the entire device is lightweight and does not require a large floor area, the casing 1 can be mounted on a work table or the like for use. . Further, since the original plate 2 made of transparent glass is a table top type in which it is arranged on the upper surface of the casing 1 and is small in size, there is an advantage that copying can be performed with a so-called copy feeling and handling is very easy.

〔effect〕

As described above, according to the present invention, in the table-top type casing, the optical path of the reflected light of the document exposed while scanning is detoured by the mirror, and it is possible to reduce and enlarge the size with a simple structure. Therefore, it is possible to provide a plate making camera device with a reduction / enlargement function that does not require a large floor area and is easy to handle. In addition, since the traveling speed of the exposure unit can be freely set, portrait-and-landscape reproduction can be easily performed.

[Brief description of the drawings]

 FIG. 1 is a schematic explanatory view showing an embodiment of the present invention. 1 ... Casing, 2 ... Original platen 3 ... Original, 4 ... Exposure unit 5 ... First mirror unit 6 ... Lens, 9 ... Photosensitive material 7 ... Second mirror unit 8 ... Conveyor system

Claims (1)

(57) [Claims] 1. A transparent glass platen placed on an upper surface of a casing, an exposure unit for exposing a plate for photolithography placed on the platen in a slit shape, and the exposure unit in the longitudinal direction of the slit. The first way to drive in the right angle direction
A drive mechanism; a first mirror unit that guides the reflected light from the document to a lens system; a second drive mechanism that allows the first mirror unit to run parallel to the exposure unit;
A first initial positioning mechanism of the mirror unit, a second mirror unit that guides the reflected light that has passed through the lens system to the photosensitive material, a second initial positioning mechanism of the second mirror unit, and the photosensitive material in parallel with the exposure unit. In a plate-making camera device including a conveyor system for traveling, initial positioning of a first mirror unit and a second mirror unit by a first initial positioning mechanism and a second initial positioning mechanism, and traveling speeds of the exposure unit and the first mirror unit. And a traveling speed of the photosensitive material are freely set with respect to the exposure unit, thereby making it possible to freely set a scanning direction of the document and a reduction / enlargement magnification in a direction perpendicular to the scanning. .