JPH03296731A - Zoom projection lens with prism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a reader that enlarges and projects information captured on microfilm and a projection lens for a reader printer, particularly a zoom projection lens.

<Prior Art> When using a reader printer with an A4 size horizontal screen and using a document format fish film, since the document is in a vertical format, the entire image cannot be viewed on the screen. Therefore,
Two lenses are prepared, one for low magnification and one for high magnification, and by switching the lenses with the turret, the low magnification lens reduces the document and projects the entire image on A4 horizontal size, and when printing, the lens is switched. I either switched to high magnification and rotated the fish carrier 90 degrees, or used a prism to turn the image onto A4 paper.

<Problems to be Solved by the Invention> By the way, the conventional method described above in which high-magnification and low-magnification lenses are prepared and switched using a turret has two problems: the fish carrier moves when the lenses are switched, and the printing quality is affected. Since it is necessary to rotate the image by 90', the fish carrier must be rotated by 90'. Additionally, if a prism is used for the high-magnification lens of the turret, the fish carrier will move when switching lenses, and correcting this will require correcting the image using the prism, making it difficult to align the carrier. It had become a thing.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a zoom projection lens with a prism for use in a reader printer, etc., which allows carrier positioning to be easily performed.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a zoom projection lens with a prism in which a zoom lens and a prism are integrally configured, such that the prism rotates in conjunction with the movement of a zooming lever. This is what I did.

<Function> The prism-equipped zoom projection lens configured as described above can perform 90° image rotation and zooming simply by operating the zooming lever, making switching operations easy.

<Example> Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, FIG. 2 is a schematic diagram of a microfilm reader printer to which the projection lens of this embodiment is applied.

In the figure, 1 is a film illumination unit consisting of an illumination lamp, a reflector, a condenser lens, a field lens, etc.;
F is a microfiche film, and the desired frame image area F
a is searched and set by manually moving a fish carrier (not shown) to the illumination optical path position. 20 is a projection lens which will be described later, and 2, 3 and 4 are the first lenses arranged on the reader mode optical path side. Second. The first mirror 2 is a third mirror, and the first mirror 2 has a switching mechanism (
(not shown), and 5 is a projection screen having the horizontal size of an A4 sheet. 6 and 7 are respectively arranged on the printer mode optical path side. This is the fifth mirror. Reference numeral 8 denotes a printer mechanism such as a transfer type electrophotographic copying mechanism, and in addition to a rotating photosensitive drum 9 and a slit plate 10 as recording media, there are various known required image forming process devices around the photosensitive drum 9. is located. Further, the first mirror 2 is driven to scan and rotate in synchronization with the rotation of the photosensitive drum 9 in the printer mode optical path position.

In the reader mode, the first mirror 2 is automatically switched to the solid line position shown in FIG. A reader optical path system is formed from the second mirror 3 to the third mirror 4 to the screen 5, and the entire frame image Fa of the desired microfilm F located in the film illumination unit 1 is projected onto the screen 5 as a still image. be done.

In the printer mode, the first mirror 2 is automatically or manually switched to a rotated position of 90° as shown by the two-dot chain line in FIG. → Projection lens 20 → First mirror 2 → Fourth mirror 6 → Fifth mirror 7 → Slit plate 10
→A printer mode optical path leading to the photosensitive drum 9 is formed,
When the first mirror 2 is switched to the print mode side as described above, the first mirror 2 scans around the horizontal axis NIB at a predetermined constant angular velocity synchronized with the rotational peripheral speed (plane movement speed) of the photosensitive drum 9. Rotated. Then, by scanning and rotating the first mirror 2, a projected image of a desired frame image Fa of the film F is slit-exposed onto the peripheral surface of the photosensitive drum 9 through the printer optical path, and the desired frame image Fa in FIG. 21 is a lens holder outer cylinder that holds the lens barrel and is pressed against the pressure plate glass surface that supports the film F, and has a female helicoid screw 21a and a groove parallel to the optical axis on its inner diameter. 21b, and a rotation stopper 29, which will be described later, is fitted into the concave groove 21b, and a spring portion 21c made of an elastic member and a circular lens attached to the outer end of the spring portion 21C are provided on the outer periphery of the rotation stopper 21b. A holder holding portion 21d is provided, and the holding portion 21d is configured to engage with a concave-convex fitting portion (not shown) on the device main body side to fix the position.

Reference numeral 22 denotes a lens holder inner cylinder, in which a male helicoid screw 22a provided on the outer periphery is helicoidally coupled with a female helicoid screw 21a on the outside of the lens holder 1121 to adjust the height of the projection lens 20; Feather 22b
are provided radially, and the height of the inner cylinder can be adjusted by rotating these parts with your fingers. Reference numeral 23 denotes an external lens barrel that supports the entire zoom lens, and has guide grooves 23a and 23b in the circumferential direction as shown in FIG.
A pin 25a protruding from the prism fixing base 25 for fixing the prism lens L3 is fitted into the guide groove 23b, and a pin 26a protruding from the inner lens barrel 26 (described later) is fitted into the guide groove 23b.
The bins 25a fit together, respectively.

The movement angle of the lens 26a is set to be limited to 45 degrees, and the guide bin 23C protruding from the inner diameter side of the lower part is set to move 1127 to support the zoom lens group L1 fitted into the inner diameter part of the interior 111126. The lens L2 is engaged with a provided concave groove 27a parallel to the optical axis, and is fixed between the prism fixing base 25 and the internal lens barrel 26 by a lens holder 23d.

Reference numeral 24 denotes a rotating ring, which is rotatably fitted to the outer circumference of the external lens barrel 23.An operation lever 24a as a zooming lever is screwed to the outer circumference of the ring P, and the bin 25a,
It has a concave groove 24b parallel to the optical axis into which the tip of the prism lens 26a fits, and the rotation of the operating lever 24a allows zooming and rotation of the prism lens. The inside 11
1126, a screw hole 26b for coupling the bin 26a, and a cam groove 26 into which the bin 27b protruding from the movable cylinder 27 fits.
C is provided. Further, the lens group L1 is positioned and fixed to the movable cylinder 27 with a lens holder 27c,
The prism fixing base 25 is configured to be rotatable around the external lens barrel 23, and is prevented from coming off by a retaining ring 28 screwed onto its upper end. 29 is fixed.

In this embodiment with the above configuration, when the document fish film F is projected onto the A4 horizontal size screen 5, the entire image is projected onto the screen 5 as shown by the two-dot chain line in FIG. 6(a). I can't. Therefore, the low magnification side of the projection lens 20 (the longitudinal direction of A4
4), the entire image of the document is projected onto the screen 5 as shown by the solid line.

At this point, by rotating the blade 22b inside the lens holder 1122, the entire projection lens 20 film F
Move it up and down to focus.

Next, when printing, it is necessary to restore the reduced projection magnification and rotate the photographed image by 90". Therefore, these two tasks are combined into one.
When the operating lever 24a is rotated to the magnification enlargement side, the rotating ring 2
4 rotates and fits into the concave groove 24b, the bottles 25a, 2
6a rotates, and the bin 25a controls the operation of the operating lever 24a directly from the prism lens L3 fixed to the prism fixing base 25.
Similarly, the bin 26a moves the lens group L1 supported on the movable barrel 27 via the internal lens barrel 26 to perform a zooming action. The projected overall image is enlarged by zooming and rotated by 90" as shown in Fig. 6(b). In this way, 90° image rotation and zooming can be performed using a single operating lever. 24a.

In this embodiment, the bottles 25a and 26a are fitted into the concave grooves 24b of the rotating ring 24, but the bottles 25a and 26a are configured to fit into respective radial elongated holes provided in the rotating ring 24. It's okay.

<Effects of the Invention> As explained above, the present invention allows the rotation of the prism lens and the movement of the zooming lens to be simultaneously performed using a single wooden operating lever, thereby making it possible to easily perform the two operations, thereby improving operability. It has a positive effect.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a zoom projection lens with a prism according to an embodiment of the present invention, FIG. 2 is a schematic diagram of the optical path of a reader printer to which the projection lens is applied, and FIG. 3 is a lens with a prism of the projection lens. FIG. 4 is a perspective view of the rotating ring, FIG. 5 is a perspective view of the movable joint, and FIGS. 6(a) and 6(b) are explanatory diagrams of images on the screen. F... Microfiche film, 1... Zoom lens group, L2... Lens, L3... Prism lens, 1... Film illumination section, 5... Screen,
8... Printer mechanism section, 20... Zoom projection lens with prism, 23... 1 external part, 24... Rotating ring,
24a...operation lever (zooming lever), 25.
... Prism fixing base, 25a... Bin, 26... Internal lens barrel, 26a... Bin, 26c... Cam groove, 27
...Moveable tube, 27b...Bin. '\-77 Figure? Q ant χ4 with 15L:, 1I 4th

Claims (1)

[Claims] 1. A prism-equipped zoom projection lens in which a zoom lens and a prism are integrally configured, wherein the prism rotates in conjunction with movement of a zooming lever.