JP2847933B2 - Reader printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a reader printer, and more particularly, to magnifying and projecting image information on a screen surface by a zooming means such as a zoom lens, observing the image information, and printing the image information on paper. The present invention relates to a reader printer suitable for a micro apparatus or the like which projects and records on an image recording medium surface such as photosensitive paper.

(Prior art) Conventionally, in a reader printer such as a microfilm reader, a microfilm printer, and a microfilm reader printer, image information is projected onto a predetermined surface at various magnifications by a projection means, for example, a screen surface is placed on an image recording medium surface. It is projected. At this time, as a projection unit, a zoom lens capable of continuously and easily changing a projection magnification is often used.

For example, Japanese Patent Application Laid-Open No. 63-143518 proposes a finite distance zoom lens for a reader printer.
According to the publication, the distance from the image information position to a predetermined surface on which a projection image is formed, that is, good optical performance in which the distance between object images is kept constant by appropriately setting the lens configuration of each lens group constituting the zoom lens A zoom lens having a projection magnification of about 28 to 38 and having the following is disclosed.

(Problems to be Solved by the Invention) Generally, as the zoom ratio increases, the zoom lens
That is, as the amount of change in the imaging magnification (projection magnification) increases, the processing accuracy and assembling accuracy of each element of the zoom lens, such as a single lens and a lens holding member, become severer.

For example, if there is a processing error or an assembly error in each of these elements, the focus position on a predetermined plane (imaging plane) changes with zooming. In many cases, each element is set so as to keep the focus position fluctuation amount within an allowable range. However, in a zoom lens or the like, the focus position fluctuation amount increases as the zoom ratio increases, and the focus position fluctuation amount generally falls within the allowable range. Is very difficult mechanically.

In particular, when the projected image is printed out on paper while observing the projected image on the screen with a reader printer, etc., if the focus position of the projected image fluctuates more than an allowable value, the focus unit is adjusted each time. However, after adjusting the focus of the projected image on the screen surface, it is necessary to output a print, which is very troublesome in operation.

According to the present invention, in a reader printer that projects image information on a predetermined surface at various magnifications using a magnification unit, focus position fluctuations at various projection magnifications of the magnification unit are determined in advance, and the focus position at this time is determined. It is an object of the present invention to provide a reader printer which can manually or automatically correct a focus position change of a projected image by using the change information, and can always obtain a good projected image.

(Means for Solving the Problems) A reader printer of the present invention is a display unit for projecting and observing image information illuminated by an illumination system on a screen surface by a zooming unit, and displaying the image information on an image recording medium surface. A reader unit having a printer unit for projecting and recording, wherein focus position information indicating a focus position change on a predetermined surface due to a change in the projection magnification of the magnification unit is provided in a part of the magnification unit, and the focus position The information is read by the detecting means, and the focus unit of the magnification changing means is adjusted by the correcting means using the signal from the detecting means.

(Embodiment) FIG. 1 is a schematic view of a main part of a first embodiment of the present invention, and FIG. 2 is an enlarged explanatory view of a part of FIG.

 In the figure, 101 is a reader printer housing.

Reference numeral 11 denotes a light source, which comprises, for example, an incandescent lamp, a xenon tube, or the like. Reference numeral 14 denotes a reflecting mirror such as a concave mirror, a parabolic mirror, or an elliptical mirror, which reflects a light beam radiated from the light source 11 to a space on one side opposite to the direction in which the image information is arranged, and near a light emitting surface of the light source 11 Is focused.

Reference numeral 12 denotes a first condenser lens, which condenses a light beam directly radiated from the light source 11 and a light beam from the light source 11 reflected by the reflection mirror 14, and passes through the infrared cut filter 13 and the plane mirror 15 to the second condenser lens. Light guide to 16. The light flux condensed by the second condenser lens 16 illuminates image information 18 described later.

In this embodiment, the illumination system 102 is composed of the elements 11 to 16.

Reference numeral 17 denotes a support member, and image information 18 as an object to be projected is provided.
I support.

Reference numeral 1 denotes a zoom lens as a zooming unit. The zoom lens 1 projects image information 18 onto a screen 20 via a fixed mirror 19 and a rotatable mirror 19 '.
At the same time as 9 'is rotated, it is projected onto the image recording medium surface (not shown) by the scanning mirrors 21 and 21' at various magnifications.

The zoom lens of the present embodiment uses a screen from the image information 18.
It is designed on condition that the distance to 20 surfaces or the surface of the image recording medium, that is, the distance between the object and the image is constant.

 Reference numeral 8 denotes a focus unit of the zoom lens 1.

Reference numeral 1a denotes a zoom lens barrel, a part of which is provided with focus position information 2. 1b is a zoom operation stick.

When the zoom position of the zoom lens 1 is changed,
That is, when the imaging magnification (projection magnification) is variously changed, a focus position variation on a predetermined surface (screen surface) due to a manufacturing error of each element is obtained in advance, and the focus position variation at this time is constituted by, for example, a light reflecting surface. It is represented by a curved reflecting surface 2a. The focus position information 2 is provided around the zoom lens barrel 1a corresponding to the rotation angle of the zoom lens barrel 1. The pattern of the curved reflection surface 2a of the focus position information 2 is, for example, 20 to 50.
It is obtained from a stencil created by drawing a pattern that has been enlarged twice and printing it under reduced scale.

A light source 3 illuminates the focus position information 2.
Reference numeral 4 denotes an image forming lens, which forms the image of the focus position information 2 on a surface of a position sensor 5 as a detecting means. Numeral 6 denotes a control means, which outputs a signal for correcting a focus position variation using a signal from the detection means 5 to a driving means 7 such as a motor.
Is sending to. The control means 6 and the driving means 7 constitute one element of the correction means.

In the present embodiment, the image information 18 is projected by the zoom lens 1 on the screen 20 or an image recording medium (not shown) at various magnifications according to the above configuration. At this time, the zoom lens 1
The focus position information 2 provided in the zoom lens barrel 1a is detected by the detection means 5 to detect the change in the focus position accompanying the change in the magnification, that is, the change in the imaging magnification (projection magnification). The control unit 6 inputs a signal for correcting a focus position variation on a predetermined surface based on a signal from the detection unit 5 to the driving unit 7. Then, the drive unit 7 drives and adjusts the focus unit 8 of the zoom lens 1 based on the signal at this time, and corrects the shift of the focus position.

In the present embodiment, with such a configuration, the shift of the focus position on a predetermined surface due to the manufacturing error of each element when the projection magnification of the zoom lens is variously changed is corrected, and a good projected image always in focus is obtained. I am getting it.

3 and 4 are enlarged explanatory views of a part of the second and third embodiments of the present invention, respectively.

In the second embodiment shown in FIG. 3, a one-dimensional CCD is used as the detecting means 10.
The other configuration is the same as that of the first embodiment shown in FIGS. 1 and 2.

In the present embodiment, the focus position information 2 provided on the zoom lens barrel 1a is imaged on the surface of the one-dimensional CCD 10 by the imaging lens 4, and
The signal is read using the dimensional CCD 10, the read signal is digitally processed, and input to the subsequent control means 6.

By digitally processing the read signal in this manner, the focus position information 2 can be detected with high accuracy without being affected by, for example, external light.

The third embodiment shown in FIG. 4 differs from the first embodiment shown in FIGS. 1 and 2 in that a density scale is used as the focus position information 9 and a photo sensor is used as the detection means 41. This is the same as in the first embodiment.

In the present embodiment, the density scale plate 9 is represented by a density pattern in which the amount of focus position variation at each projection magnification is set in steps using the focus position variation value at the reference projection magnification of the zoom lens 1 as the reference value as focus position information. Used. The relationship between the density pattern on the density scale plate 9 and the focus position variation is set, for example, as shown in Table 1.

In this embodiment, the density scale plate 9 is provided along the rotation angle direction of the zoom lens barrel 1a. That is, the density pattern corresponding to the focus position fluctuation amount when the projection magnification of the zoom lens 1 is changed is read by the photo sensor as the detecting means 41.

Then, the signal from the detection means 41 is input to the subsequent control means 6, and thereafter, the focus unit 8 is adjusted by the driving means 7 to correct the focus position fluctuation in the same manner as in the first embodiment.

(Effect of the Invention) According to the present invention, when projection is performed on a screen surface or an image recording medium surface at various magnifications by using a magnification unit as a projection unit of a reader printer, a predetermined surface due to a manufacturing error of the magnification unit. The focus position variation above is obtained in advance, and the focus position information is provided in a part of the zooming unit, for example, in a part of the zoom lens barrel, and the focus position information is detected by the detection unit,
By using the signal from the detection means to make correction by the correction means, it is possible to achieve a reader printer capable of obtaining a good projected image in focus over the entire projection magnification.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a first embodiment of the present invention, FIG. 2 is an enlarged explanatory view of a part of FIG. 1, and FIGS. 3 and 4 are second and third embodiments of the present invention, respectively. It is an enlarged explanatory view of a part of. In the drawing, 1 is a zoom lens, 2 and 9 are focus position information, 3 is a light source, 4 is an imaging lens, 5, 10, and 41 are detection means, 6 is control means, 7 is drive means, 8 is a focus unit, and 11 Is the light source,
12 is a first condenser lens, 13 is an infrared cut filter, 14 is a reflecting mirror, 15 is a mirror, 16 is a second condenser lens, 17 is a support member, 18 is image information, 19 is a rotating mirror,
20 is the screen surface, 101 is the reader printer housing, 102
Is a lighting system.

Claims (1)

(57) [Claims] 1. A reader printer having a display unit for projecting and observing image information illuminated by an illumination system on a screen surface by a magnification unit and a printer unit for projecting and recording the image information on an image recording medium surface. In the present invention, focus position information indicating a focus position variation on a predetermined surface due to a change in the projection magnification of the magnification unit is provided in a part of the magnification unit, and the focus position information is read by a detection unit, and the focus position information is read from the detection unit. A reader printer characterized in that a focus unit of the variable power unit is adjusted by a correction unit using a signal.