JPS6152062A - Picture reading device - Google Patents

Abstract

PURPOSE:To obtain a reading device which is composed to be unwasted and low-priced by sharing a picture reading device with both picture reading device having an original mounting stand and a microfilm picture reading device. CONSTITUTION:When an original is placed on an original mounting stand 1 of a transparent plate-shaped member, light emitting an illumination lamp 3 is reflected at a picture surface of the original, the reflecting light image reaches through the first mirror 4 and the second mirror 5 to a lens F and proceeds with the first optical path 1 image-formed on CCD6, a picture reading means, by the lens F. A microfilm 16 contained in a cassette 15 is pulled out, wound through small rollers 17, 18 and 19 to a take-up reel 20 and an illumination lamp 21 lights up, and then, the light is converged by a converging lens 22, the light transmitting one top 23 of the film 16 is reflected through a lens E by a mirror 24 and a fluctuating mirror 7 and proceeds to the second optical path L2 which is image-formed to CCD6. The optical path L1 and the optical path L2 are selected by conducting and interrupting of electricity to a plunger 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field to which the invention pertains) The present invention relates to an image reading device that optically reads an original image, converts one image information into an electrical signal, and outputs the electrical signal.

(Technical background) Conventionally, this type of device illuminates the image surface of a document placed on a transparent plate-like document table, and transmits the reflected light image to a charge-coupled device (hereinafter referred to as COD) or the like. An image reading device is known that forms an image on an image reading means, converts the read image into an electrical signal, and outputs the electrical signal.

This image reading device has a built-in signal processing circuit such as an A/D conversion circuit for converting image information converted into an analog electrical signal by COD into a digital signal, or a dither circuit for performing halftone correction of image information. and for this reason,
The image information signal output from the image reading device can be recorded on a large-capacity flea information recording medium such as an optical disk, and can also be calculated by an electronic computer or an image processing device.

Furthermore, it is also possible to visually display the image information using an image display device such as a CRT.

Incidentally, an image reading device different from the image reading device having the above-mentioned document mounting table is being developed.

This device reads the image on the microfilm surface using COD and outputs the image information as an electrical signal.
More specifically, since the image surface of the microfilm is irradiated with light, the transmitted light image is formed on a CCD, and the image information is converted into an electrical signal and output, the image with the document mounting table described above is used. Similar to the reading device, it is possible to output the read image information to a large-capacity information recording medium, a computer, an image processing device, an image display device, or the like.

For this reason, the image reading device (hereinafter referred to as the first image reading device) having the document placement table and the above-mentioned microfilm image reading device (hereinafter referred to as the second image reading device),
A single image information processing system can be configured by connecting with the various devices described above.

However, when configuring an image processing system that includes both a first image reading device and a second image reading device,
Each of the first and second image reading devices requires a COD, which is an image reading means, and a signal processing circuit such as an A/D conversion circuit or a dither circuit. It is a common practice to have duplicate circuits.

For this reason, the system having the first and second image reading devices described above has the disadvantage that it becomes a wasteful and expensive system configuration.

(Object of the Invention) In view of the above points, the present invention eliminates the drawbacks of the conventional example and eliminates waste by sharing one image reading means with both the first and second image reading devices. It is an object of the present invention to provide an image reading device having an inexpensive configuration without any problems.

(Example) Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing the configuration of an optical system of an image reading device according to an embodiment of the present invention.

Below the document mounting table 1, which is a transparent plate-like member, there is a
``An illumination lamp 3 having a reflective shade 2 is arranged.

When an original (not shown) is placed on the original placing table 1, the light emitted from the illumination lamp 3 is reflected on the image surface of the original, and the reflected light image is formed on the first mirror 4. It passes through the second mirror 5 and reaches the lens F, and then the CCD, which is an image reading means, is connected to the lens F.
The light beam travels along the first optical path L1 where the image is formed on the optical fiber 5.

Incidentally, in the first optical path L1, a swinging mirror 7 is fixedly arranged on a single mirror 8.

The above mirror 8 has dowels 9 and 10 fixed on both sides.
It is swingable in the directions of arrows A and B with one end 11 as an axis.
a is pulled by a spring 11 fixed to the main body, and abuts against a stopper pin 12 fixed to the main body, so that it is at the angle shown in the figure.

At this time, the light traveling along the first optical path L1 is blocked by the single mirror 8 and does not reach the CCD 8.

A plunger 14 connected to the mirror unit 8 via a link plate 13 is fixed to the main body, and when the plunger 14 is energized, the mirror unit 8 is connected to the plunger 14 via the link plate 13. The mirror unit 8 is pulled and rotated in the direction indicated by the arrow, and is removed out of the first optical path L1.

Therefore, the image of the document placed on the document table 1 can be displayed by energizing the plunger 14 and moving the illumination lamp 3, first mirror 4, and second mirror 5 in the direction of arrow C.
Scanning and reading are performed by the CCD 6 and converted into electrical signals.

Note that in this embodiment, when the moving speed of the illumination lamp 3 and the first mirror 4 is υ1, and the moving speed of the second mirror is υ2, there is a relationship of υ2=1/2−υ1, so-called 2: 1 optical system is used.

On the other hand, the microfilm 1 stored in the cassette 15
6 is pulled out and wound around a winding wheel 20 via small rollers 17, 18 and 19. When the illumination lamp 21 is turned on, the light is condensed by the condenser lens 22, and the light that passes through one frame 23 of the microfilm 15 passes through the lens E and is directed to Michi 24. C reflected by the swinging mirror 7
The light beam travels along the second optical path L2 where the image is formed on the CD6.

When using the second optical path L2 in this way, since the swinging mirror 7 is used, the plunger 14 is de-energized and the mirror 8 is placed at a position having the angle shown in the figure.

In this state, the feed motor 25 rotates the take-up reel and moves the microfilm F in the direction of the arrow, so that the image of the frame 23 is scanned and read by the CCD 6 and converted into an electrical signal.

In addition, when feeding the frame 23 necessary for reading to a predetermined exposure position, the feed motor 25 or the winding motor 26 is used.
This is done by controlling the drive of.

As described above, in this embodiment, the plunger 14
When energized, only the light that has passed through the first optical path L1 is CC
When the light is imaged on D5 and the power to the plunger 14 is cut off, only the light that has passed through the second optical path L2 is imaged on the CCD.

Therefore, by controlling the energization to the plunger 14, either the first optical path or the second optical path can be selectively used as necessary.

FIG. 2 is a block diagram of the image signal processing section used in this embodiment.

The image information read by the CCD 6 and converted into an analog electrical signal is converted into a digital signal by the A/D conversion circuit 30 and input to the signal processing circuit 31 .

This signal processing circuit 31 has, for example, a dither circuit for performing halftone correction, a scaling processing circuit for electrically performing enlargement and reduction, and a circuit for performing edge enhancement, shading correction, etc. . The image information signal processed by the signal processing circuit 31 is output to the data bus line 33 of the system via the interface 32 and sent to various other external devices.

In this embodiment, the two optical paths Ll shown in FIG.
, L2, the signal processing circuit 31 and the A/D conversion circuit 30 . Since signals can be sent using the interface 32, the configuration is efficient and efficient.

(Effects) As described above, by using the present invention, it is possible to read both the original image placed on the original plate, which is a transparent plate-like member, and the microfilm image with one COD. Therefore, only one COD is required, and C
Since the configuration includes only one set of signal processing circuits connected to the OD, it is possible to eliminate the drawbacks mentioned in the conventional example and provide an image reading device with a lean and inexpensive configuration.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of an optical system of an image reading apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of an image signal processing section used in the embodiment. 1---- Original pi placing stand 3 which is a transparent plate-like member---
Illumination lamp 4-111 First mirror 5---Second mirror F-1~-Lens 7---Swinging mirror 8---One mirror 6---Image reading means C0D IL---One spring 12~-m-stop pin 14---
--- Plunger 15 --- One cassette 16 --- Micro film 21 --- One illumination holder 23 --- One frame E-- One -- Lens 24 --- Mirror L L-
---First optical path L2----Second optical path 30---
- A/D conversion circuit 31 --- one signal processing circuit 32
-----Interface

Claims (1)

[Scope of Claims] In an image reading device having an image reading means for reading an optical image from an original image surface and converting image information into an electrical signal, the image reading means reads an optical image from an original image surface placed on a transparent plate-like member. A first optical path leading to the microfilm original image surface and a second optical path leading from the microfilm original image surface to the image reading means.
An image reading device comprising: an optical path; and means for selectively using either the first optical path or the second optical path.