JPH0134184Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a projection original plate holder that can be detachably attached to a projection device while holding a projection original plate such as a film or a dry plate, and in particular has a simplified mechanism for adjusting the rotational position of the projection original plate. It is.

Commonly known projection devices include projectors and enlargers that enlarge and project a film image onto a screen, and electrophotographic devices that enlarge and copy microfilm. , a condenser lens that collects light from this light source, a film holder that supports a film on which a projected image is printed, and a projection lens that enlarges and forms the film image on a projection surface. Among these components, the role of the film holder in particular is to accurately maintain the position of the film relative to the projection lens, and of course to prevent it from wobbling, but especially when enlarging microfilm for copying. In electrophotographic devices, the mechanical design of the film holder is very important because slight undulations or inclinations on the film surface greatly affect the sharpness of the image. Generally, a film holder is placed between a condenser lens and a projection lens, and is detachable from the main body of the apparatus.
In other words, the film holder can be detachably attached to two mutually parallel guide rails provided on the main body of the device in a direction perpendicular to the optical axis, but the film holder is also attached to the main body of the device. In order to correct the position of the film to the proper position when the film is removed, there is a moving mechanism that moves the film in a plane perpendicular to the optical axis of the lens, and a rotational position adjustment mechanism that moves the film rotationally around the optical axis of the lens. is necessary.

Conventionally, the moving mechanism was often built into the film holder, but the rotational position adjustment mechanism is such that the guide rail rotates around the optical axis relative to the main body of the device. Therefore,
The guide rail had a structure in which it was attached to a guide member rotatably provided in the main body of the device.

As described above, in the conventional device, a rotation position adjustment mechanism for rotating the film holder and a guide rail for guiding and supporting the film holder in a detachable manner were required on the device main body side. The structure was complicated, and the position of the guide rail had to be checked when attaching the film holder, making the operation troublesome.

Therefore, the present invention solves the above-mentioned problems and makes it possible to attach and detach projection original plates such as films and dry plates, and to adjust the rotational position with very simple operations without the need for a special rotational position adjustment mechanism or guide rail on the main body of the device. It is an object of the present invention to provide a projection original plate holder that can perform the following steps.

The structure of the present invention for achieving this purpose is such that a cylindrical lens is positioned between the condenser lens and the projection lens, and is formed on the outer peripheral surface of the lens barrel of the condenser lens or the projection lens, or on the main body of the device to which they are attached. In a projection original plate holder that is detachably inserted into a concave and convex portion formed on the outer circumferential surface of a guide member, one end is rotatably supported on a holder body that holds the projection original plate, and the other ends are moved closer to each other. a pair of clamping arms that are applied with a spring force to connect and hold the holder main body to the lens barrel or the guide member; and at least one arm on the other end side of the clamping arm that clamps the lens barrel or the guide member. A locking member that is provided and capable of engaging with the uneven portion to position the holder main body with respect to the lens barrel or the guide member and guiding the rotation of the holder main body about the lens barrel or the guide member. A stop member is provided.

The projection original plate holder according to the present invention will be described in detail based on an embodiment shown in the drawings applied to an electrophotographic apparatus, but the structure of the main part of the electrophotographic apparatus will be omitted since it is not related to the present invention. As shown in FIG. 1, the projection original plate holder shown in this embodiment is detachably inserted into a lens barrel 4 of a condenser lens 3 that collects light from a light source 2 reflected by a mirror 1. and the inserted projection original plate holder 5
is slidably mounted on the upper end of the lens barrel 4. Furthermore, this projection original plate holder 5 is placed on the projection original plate holder 5.
A projection lens 6 is positioned to form an image of characters, figures, etc. printed on a projection original plate (not shown) such as a film or dry plate mounted inside on a screen or a copying surface (not shown) of a copying machine. . As shown in FIGS. 2 to 4, the structure of the projection original plate holder 5 according to this embodiment is as follows. A pair of curved clamping arms 8 for clamping and connecting and holding the holder main body 7 to the lens barrel 4 are rotatably supported at one end along the bottom surface via a pin 9. Furthermore, these clamping arms 8 are interconnected by a tension coil spring 10 such that their tips (upper in FIG. 2 and right in FIG. 3) approach each other. In order to move the tips of the clamping arms 8 closer to each other, a compression coil spring may be interposed between the outside of the clamping arms 8 and the holder body 7, and a torsion coil spring may be inserted between the pins 9. There are various ways to attach it. On the other hand, on the outer periphery of the upper end of the lens barrel 4, a sloped groove (uneven part) 11 is formed such that the outer diameter decreases downward from the upper end. When inserting the original plate holder 5 into the lens barrel 4, these clamping arms 8 come into contact with the sloped groove 11 of the lens barrel 4.
Locking rollers (locking members) 12 that roll and guide the grooves 11 along the sloped grooves 11 while pushing the grooves apart are each rotatably attached. Note that these locking rollers 12 are arranged in the optical axis direction (third direction) of the condenser lens 3.
It has a truncated conical shape corresponding to the inclined groove 11 so that the projection original plate holder 5 does not come off in the vertical direction in the figure. Further, in the holder main body 7 between the pair of clamping arms 8, a holder body 7 engages with an inclined groove 11 and cooperates with a locking roller 12 of the clamping arm 8 to connect and hold the projection original holder 5 to the lens barrel 4. At the same time, a pair of locking rollers (locking members) 13 are rotatably attached to guide the rotational movement of the projection original plate holder 5 about the lens barrel 4 . These locking rollers 13 also serve as a stopper to prevent the clamping arm 8 from coming too close when the projection original plate holder 5 is removed from the lens barrel 4. On the other hand, in the holder body 7,
A guide rail 14 is provided, and this guide rail 1
Carriage 1 is attached so that it can freely move back and forth along 4.
A pair of guide rails 16 are attached to the guide rail 5 at right angles to the guide rail 14. Furthermore, a frame-shaped carriage 18 is attached to the guide rail 16 so as to be able to reciprocate (vertically in the vertical direction in FIG. 2) to which a pair of transparent hard plates 17 for holding the projection original plate are attached. . The holder body 7 and the carriage 15 are provided with an opening window so that the light from the condenser lens 3 passes through the projection original plate. A support surface is formed to support the projection original plate holder.

Therefore, the projection original plate holder 5 with the projection original plate mounted on the transparent hard plate 17 in advance is placed horizontally in the inclined groove 11 of the lens barrel 4.
, the locking roller 12 of the clamping arm 8 engages with this sloped groove 11 and the locking roller 12
As the gripping arm 8 rolls, the clamping arm 8 is pushed out and inserted, and eventually the locking roller 13 is inserted into the sloped groove 1.
1. At this time, the support surface of the holder body 7 comes into contact with the upper end of the lens barrel 4 to support the projection original plate holder 5, but the projection original plate holder 5 can be inserted from any direction, making the operation easy. The projection original plate holder 5 is held on the lens barrel 4 by these four locking rollers 12 and 13, and
By rolling along the inclined groove 11 of No. 3, the lens barrel 4 can be rotated around the lens barrel 4. Further, the position adjustment in the direction perpendicular to the optical axis of the projection original plate can be performed by moving the carriage 15 to the guide rail 14 or moving the carriage 18 to the guide rail 14.
This can be done by moving each along the guide rail 16.

In this embodiment, the projection original plate holder 5 is rotatably connected and held to the lens barrel 4 by four locking rollers 12 and 13, but it is sufficient to have at least three locking rollers. , arc-shaped locking members that have the same curvature as the sloped groove 11 and are slidably engaged therewith are attached in oppositely facing states, whereby the lens barrel 4
may be slidably held.

Furthermore, the uneven portion on the outer periphery of the lens barrel 4 with which the locking member engages does not have to be made into the sloped groove 11 as in this embodiment.
An annular groove or protrusion that prevents the projection original plate holder 5 from slipping out in the optical axis direction of the lens may be formed on the guide member, and a locking member corresponding to this shape may be used. Furthermore, it is of course possible to attach and detach the projection original plate holder 5 to a cylindrical guide member protruding from the lens barrel of the projection lens 6 or the main body of the apparatus to which the condenser lens 3 and the projection lens 6 are attached. .

Furthermore, it goes without saying that this holder can be applied to various projection devices.

As explained above, in the present invention, the projection original plate holder can be attached to and removed from the concave and convex portion formed on the outer periphery of a cylindrical guide member provided on the lens barrel or the main body of the device, and the projection original plate holder can be attached to the concave and convex portion of the lens barrel in an engaged state. Alternatively, since it is made to be able to rotate around the guide member, there is no need to provide a guide rail for inserting a rotation mechanism and a projection original plate holder into the lens barrel or guide member as in the past, and the cost of the main body of the apparatus can be reduced. Furthermore, since the projection original plate holder can be inserted from any direction from the outer periphery of the uneven portion of the lens barrel or guide member, it is easy to attach and remove the projection original plate holder, and the angular position adjustment of the projection original plate can be performed only with the projection original plate holder. It's very easy to move around.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing a part of an optical projection apparatus to which a projection original holder according to the present invention can be attached, and FIGS. 2 to 4 show an embodiment of the projection original holder according to the invention. Its plan, 3rd
The figure is a sectional view taken along the line A-A in FIG. 2, and FIG. 4 is a view taken along the line B in FIG. In the drawing, 3 is a condenser lens, 4 is a lens barrel, and 5 is a condenser lens.
1 is a projection original plate holder, 6 is a projection lens, 7 is a holder body, 8 is a clamping arm, 9 is a pin, 10 is a tension coil spring, 11 is an uneven portion, and 12 and 13 are locking members.

Claims (1)

[Scope of utility model registration request] An uneven portion formed on the outer circumferential surface of the lens barrel of the condenser lens or projection lens in a state between the condenser lens and the projection lens, or on the outer circumferential surface of a cylindrical guide member formed on the device body to which these are attached. In the projection original plate holder, which is detachably inserted into the lens barrel, one end is rotatably supported by the holder main body holding the projection original plate, and the other ends are applied with a spring force so as to approach each other. a pair of clamping arms that connect and hold the holder main body to the guide member; and a pair of clamping arms that are provided at least on the other end side of the lens barrel or the clamping arms that clamp the guide member, and that engage with the uneven portion and hold the lens barrel. Alternatively, a projection original plate comprising a locking member capable of positioning the holder body with respect to the guide member and guiding rotation of the holder body around the lens barrel or the guide member. holder.