JP2557455Y2 - Microfilm reader scanner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfilm reader and a microfilm reader printer using a CCD, and can be applied to a copying machine and a facsimile machine.

[0002]

2. Description of the Related Art As a microfilm image reading apparatus, Japanese Patent Application Laid-Open No. 61-261733 discloses a microfilm image reading apparatus.
The microfilm and the projection lens, the illuminating means and the reading means are fixed, and a pair of mirrors are scanned to read a microfilm image. As disclosed in Japanese Patent Application Laid-Open No. 62-5770, the transmitted light from the microfilm is used. Is projected on a reading device by an imaging lens, and a switching optical path is switched to a screen by a switching mirror, and at the same time, a projection lens is further inserted and used in the path.

[0003]

However, in a micro-reader scanner capable of reading a micro-film image by enlarging the micro-film image on a screen and projecting the micro-film image on a reading means such as a CCD image sensor. When switching between screen projection and projection to the reading means is performed by switching the optical path by a mirror as described in the above, deterioration of the resolution and light amount of the microfilm image by the switching mirror is inevitable. further,
The screen projection lens is a high-magnification lens of 10 to 30 times and has a long optical path length. Therefore, it is necessary to secure a long optical path length even when the optical path is switched to the reading means. Also, the reading device requires a large and expensive device.

Further, as in the case described above, in a system in which a common imaging lens is used for both the screen and the reading means, and another optical path is switched by a mirror and another projection lens is positioned on the path at the same time as the optical path, Image deterioration due to switching, reduction in resolution due to insertion of a projection lens, and image deterioration due to an optical axis alignment error were inevitable.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and has the following structure. (1) A CCD line reader is arranged and retractable on an optical path for projecting the transmitted light image of the microfilm onto a screen, and when the reader is located on the image projection optical path, the CCD line reader is placed on the reader. In order to form an image of the microfilm, the projection lens of the reading device having a smaller magnification is switched to the position of the screen projection lens, and the reading projection lens is selectively arranged on the same optical axis as the optical axis of the transmitted light. A microfilm reader scanner characterized in that: (2) It is configured to rotate around one end and to dispose and retract a CCD line reader on an optical path for projecting an image onto a screen, and to use a turret for each projection lens for screen projection and CCD line reader projection. The microfilm reader scanner according to (1), wherein the microlens reader scanner is provided on a plate, and any one of the projection lenses is arranged to be switched on an image projection optical path of the microfilm.

[0006]

According to the present invention, when switching between screen projection and projection to the reading means, the switching mirror is not used, and the reading means arranged on the screen projection optical path is interlocked with retreating from the optical path. Since the two lenses, one for projection and one for projection to the reading means, are switched, the screen projection image and the microfilm image of the high-quality microfilm are not affected by the deterioration of the resolving power and light quantity by the switching mirror. Reading can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is a side sectional view showing a schematic configuration of a microfilm reader printer according to the present invention, and FIG. 2 is a perspective view showing a configuration of a reading device part of FIG.

As shown in FIGS. 1 and 2, inside a micro-reader scanner 1, a halogen lamp 5, which is an illumination device for projecting an image of a micro-film 2 onto a screen 3 or a CCD line sensor 4, a spherical reflection device. A mirror 6, a condenser lens 7, a lens turret 9 having separate projection lenses 8a, 8b for projecting onto the screen 3 or the CCD line sensor 4, and a projection mirror 10 onto the screen 3 are provided. When the projection lens 8a is on the projection optical path of the microfilm image, the CCD line sensor 4 rotates around the rotation support shaft 4a and moves from the projection optical path to a retracted position (see FIG. 2) indicated by a chain line. Then, the microfilm image is reflected by the projection mirror 10 and projected on the screen 3, and the lens turret 9 is When the projection lens 8b is positioned on the projection optical path of the microfilm image by rotating about the fulcrum a, the CCD line sensor 4 is placed on the projection optical path and the microfilm image is
Is projected and imaged.

When an image is read by the CCD line sensor 4, the CCD line sensor 4, a halogen lamp 5, a spherical reflecting mirror 6, a condenser lens 7, and projection lenses 8a and 8b are attached as shown in FIG. The lens turret 9 is integrally attached to the holding stand 11 and is configured to perform sub-scanning scanning reading of the image of the microfilm 2 fixed to the frame of the microreader scanner 1 by moving the holding stand 11 in the arrow direction. I have. The main scanning is performed by photoelectric means along the axis of the CCD line sensor 1.

The movement of the holding table 11 for the sub-scanning
Slide guides are provided along guide shafts 12 and 13 fixed to the machine frame.
A fixed nut member 1 which is screwed to the feed screw 14 implanted in the nut and whose position is fixed in the feed screw axial direction and which is rotatable.
5. The driving is performed by a driving device 18 including a stepping motor 17 that rotationally drives the fixed nut member 15 via a belt 16 in forward and reverse directions.

Further, light from the halogen lamp 5 is condensed by the condenser lens 7, illuminates the microfilm 2, and reaches the projection lens. As the projection lens, two lenses, a screen projection lens 8a and a projection lens 8b to the CCD line sensor 4, are prepared. In this embodiment, the screen projection lens 8a has a magnification of 15 × and an optical path length. It has a magnification of 2.16 × and an optical path length of 216 mm, and is mounted on a lens turret 9.

In the normal reader state, the CCD line sensor 4 is rotated about the support shaft 4a by a driving device (not shown) at a position shown by a dashed line in FIG. 2 and retracts from the optical path, and at the same time, the lens turret 9 is not shown. The driving device rotates about the support shaft 9a, and the screen projection lens 8a is selected as the projection lens. The film image is reflected by the projection mirror by the screen projection lens 8a and is projected on the screen 3. Reference numeral 4b is a balance weight.

When reading an image, the CCD line sensor 4 is rotated and moved to the solid line position, and the projection lens 8b is selected by the rotation of the lens turret 9 as the projection lens. Here, the holding table 11 has a CCD
The line sensor 4, the projection lens 8b, and the condenser lens 7 are arranged on the same optical axis, and the holding table 11 is sub-scanned in the direction of the arrow by the driving device 18 at a constant speed with respect to the immobile microfilm 2. And microfilm 2
Is read.

The retreat of the CCD line sensor from the optical path and the switching operation of the projection lens may use other switching moving means instead of the rotation about the support shaft.

[0015]

As described above, in the present invention, the switching between the screen projection and the projection to the reading means is performed in conjunction with retracting the reading means from the optical path without using the switching mirror. By switching between the two lenses, one for projection and one for reading projection, the quality of the screen projection image and the microfilm image of the high-quality microfilm is not affected by the deterioration of the projection resolution and light quantity due to the use of the switching mirror. A reading is obtained. Further, the optical axis position at the time of switching between the screen projection lens and the reading lens does not require positional accuracy such as the optical axis alignment when the attachment lens is added.

As the projection lens, a conventional lens can be used for projecting the screen. For the reading projection lens, the CCD line sensor 4 as the reading means can be reduced by reducing the magnification. In addition, since the optical path length is short, the reading means, the projection lens, and the illuminating means can be compactly arranged on the same holding stand 11, making the film immovable.
Is subjected to sub-scanning with respect to the film 2, whereby a film image is read only with paraxial light of the lens, so that a high-resolution lens can be obtained relatively easily. Further, the size of the entire machine is compact.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a schematic configuration of a microfilm reader scanner according to the present invention.

FIG. 2 is a perspective view showing a configuration of a reading device part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microfilm reader scanner 2 Microfilm 3 Screen 4 CCD line sensor 5 Halogen lamp 6 Spherical reflector 7 Condenser lens 8a Screen projection lens 8b CCD projection lens 9 Lens turret 10 Projection mirror 11 Holder 12 Guide axis 13 Guide axis 14 Lead screw 18 drive

Claims (2)

(57) [Scope of request for utility model registration] A CCD line reader is arranged on an optical path for projecting a transmitted light image of a microfilm onto a screen.
When the reading device is installed on the image projection optical path, the reading device having a smaller magnification is located at the position of the screen projection lens so that an image of the microfilm is formed on the reading device. A microfilm reader scanner wherein a projection lens is switched and a reading projection lens is selectively arranged on the same optical axis as the optical axis of the transmitted light. 2. A CCD line reading device, which is rotated about one end as a fulcrum, and arranges and retracts a CCD line reader on an optical path for projecting an image onto a screen.
2. The microfilm reader scanner according to claim 1, wherein each projection lens for projecting the line reading device is provided on a turret plate, and any one of the projection lenses is arranged to be switched on an image projection optical path of the microfilm.